SemaDeclCXX.cpp revision e3406826db726960ede77dd18361eb327d30c108
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/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // If this function has a basic noexcept, it doesn't affect the outcome. 133 if (EST == EST_BasicNoexcept) 134 return; 135 136 // If we have a throw-all spec at this point, ignore the function. 137 if (ComputedEST == EST_None) 138 return; 139 140 // If we're still at noexcept(true) and there's a nothrow() callee, 141 // change to that specification. 142 if (EST == EST_DynamicNone) { 143 if (ComputedEST == EST_BasicNoexcept) 144 ComputedEST = EST_DynamicNone; 145 return; 146 } 147 148 // Check out noexcept specs. 149 if (EST == EST_ComputedNoexcept) { 150 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 151 assert(NR != FunctionProtoType::NR_NoNoexcept && 152 "Must have noexcept result for EST_ComputedNoexcept."); 153 assert(NR != FunctionProtoType::NR_Dependent && 154 "Should not generate implicit declarations for dependent cases, " 155 "and don't know how to handle them anyway."); 156 157 // noexcept(false) -> no spec on the new function 158 if (NR == FunctionProtoType::NR_Throw) { 159 ClearExceptions(); 160 ComputedEST = EST_None; 161 } 162 // noexcept(true) won't change anything either. 163 return; 164 } 165 166 assert(EST == EST_Dynamic && "EST case not considered earlier."); 167 assert(ComputedEST != EST_None && 168 "Shouldn't collect exceptions when throw-all is guaranteed."); 169 ComputedEST = EST_Dynamic; 170 // Record the exceptions in this function's exception specification. 171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 172 EEnd = Proto->exception_end(); 173 E != EEnd; ++E) 174 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 175 Exceptions.push_back(*E); 176} 177 178bool 179Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 180 SourceLocation EqualLoc) { 181 if (RequireCompleteType(Param->getLocation(), Param->getType(), 182 diag::err_typecheck_decl_incomplete_type)) { 183 Param->setInvalidDecl(); 184 return true; 185 } 186 187 // C++ [dcl.fct.default]p5 188 // A default argument expression is implicitly converted (clause 189 // 4) to the parameter type. The default argument expression has 190 // the same semantic constraints as the initializer expression in 191 // a declaration of a variable of the parameter type, using the 192 // copy-initialization semantics (8.5). 193 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 194 Param); 195 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 196 EqualLoc); 197 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 198 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 199 MultiExprArg(*this, &Arg, 1)); 200 if (Result.isInvalid()) 201 return true; 202 Arg = Result.takeAs<Expr>(); 203 204 CheckImplicitConversions(Arg, EqualLoc); 205 Arg = MaybeCreateExprWithCleanups(Arg); 206 207 // Okay: add the default argument to the parameter 208 Param->setDefaultArg(Arg); 209 210 // We have already instantiated this parameter; provide each of the 211 // instantiations with the uninstantiated default argument. 212 UnparsedDefaultArgInstantiationsMap::iterator InstPos 213 = UnparsedDefaultArgInstantiations.find(Param); 214 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 215 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 216 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 217 218 // We're done tracking this parameter's instantiations. 219 UnparsedDefaultArgInstantiations.erase(InstPos); 220 } 221 222 return false; 223} 224 225/// ActOnParamDefaultArgument - Check whether the default argument 226/// provided for a function parameter is well-formed. If so, attach it 227/// to the parameter declaration. 228void 229Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 230 Expr *DefaultArg) { 231 if (!param || !DefaultArg) 232 return; 233 234 ParmVarDecl *Param = cast<ParmVarDecl>(param); 235 UnparsedDefaultArgLocs.erase(Param); 236 237 // Default arguments are only permitted in C++ 238 if (!getLangOptions().CPlusPlus) { 239 Diag(EqualLoc, diag::err_param_default_argument) 240 << DefaultArg->getSourceRange(); 241 Param->setInvalidDecl(); 242 return; 243 } 244 245 // Check for unexpanded parameter packs. 246 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 247 Param->setInvalidDecl(); 248 return; 249 } 250 251 // Check that the default argument is well-formed 252 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 253 if (DefaultArgChecker.Visit(DefaultArg)) { 254 Param->setInvalidDecl(); 255 return; 256 } 257 258 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 259} 260 261/// ActOnParamUnparsedDefaultArgument - We've seen a default 262/// argument for a function parameter, but we can't parse it yet 263/// because we're inside a class definition. Note that this default 264/// argument will be parsed later. 265void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 266 SourceLocation EqualLoc, 267 SourceLocation ArgLoc) { 268 if (!param) 269 return; 270 271 ParmVarDecl *Param = cast<ParmVarDecl>(param); 272 if (Param) 273 Param->setUnparsedDefaultArg(); 274 275 UnparsedDefaultArgLocs[Param] = ArgLoc; 276} 277 278/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 279/// the default argument for the parameter param failed. 280void Sema::ActOnParamDefaultArgumentError(Decl *param) { 281 if (!param) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 286 Param->setInvalidDecl(); 287 288 UnparsedDefaultArgLocs.erase(Param); 289} 290 291/// CheckExtraCXXDefaultArguments - Check for any extra default 292/// arguments in the declarator, which is not a function declaration 293/// or definition and therefore is not permitted to have default 294/// arguments. This routine should be invoked for every declarator 295/// that is not a function declaration or definition. 296void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 297 // C++ [dcl.fct.default]p3 298 // A default argument expression shall be specified only in the 299 // parameter-declaration-clause of a function declaration or in a 300 // template-parameter (14.1). It shall not be specified for a 301 // parameter pack. If it is specified in a 302 // parameter-declaration-clause, it shall not occur within a 303 // declarator or abstract-declarator of a parameter-declaration. 304 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 305 DeclaratorChunk &chunk = D.getTypeObject(i); 306 if (chunk.Kind == DeclaratorChunk::Function) { 307 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 308 ParmVarDecl *Param = 309 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 310 if (Param->hasUnparsedDefaultArg()) { 311 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 312 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 313 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 314 delete Toks; 315 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 316 } else if (Param->getDefaultArg()) { 317 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 318 << Param->getDefaultArg()->getSourceRange(); 319 Param->setDefaultArg(0); 320 } 321 } 322 } 323 } 324} 325 326// MergeCXXFunctionDecl - Merge two declarations of the same C++ 327// function, once we already know that they have the same 328// type. Subroutine of MergeFunctionDecl. Returns true if there was an 329// error, false otherwise. 330bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 331 bool Invalid = false; 332 333 // C++ [dcl.fct.default]p4: 334 // For non-template functions, default arguments can be added in 335 // later declarations of a function in the same 336 // scope. Declarations in different scopes have completely 337 // distinct sets of default arguments. That is, declarations in 338 // inner scopes do not acquire default arguments from 339 // declarations in outer scopes, and vice versa. In a given 340 // function declaration, all parameters subsequent to a 341 // parameter with a default argument shall have default 342 // arguments supplied in this or previous declarations. A 343 // default argument shall not be redefined by a later 344 // declaration (not even to the same value). 345 // 346 // C++ [dcl.fct.default]p6: 347 // Except for member functions of class templates, the default arguments 348 // in a member function definition that appears outside of the class 349 // definition are added to the set of default arguments provided by the 350 // member function declaration in the class definition. 351 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 352 ParmVarDecl *OldParam = Old->getParamDecl(p); 353 ParmVarDecl *NewParam = New->getParamDecl(p); 354 355 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 356 357 unsigned DiagDefaultParamID = 358 diag::err_param_default_argument_redefinition; 359 360 // MSVC accepts that default parameters be redefined for member functions 361 // of template class. The new default parameter's value is ignored. 362 Invalid = true; 363 if (getLangOptions().Microsoft) { 364 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 365 if (MD && MD->getParent()->getDescribedClassTemplate()) { 366 // Merge the old default argument into the new parameter. 367 NewParam->setHasInheritedDefaultArg(); 368 if (OldParam->hasUninstantiatedDefaultArg()) 369 NewParam->setUninstantiatedDefaultArg( 370 OldParam->getUninstantiatedDefaultArg()); 371 else 372 NewParam->setDefaultArg(OldParam->getInit()); 373 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 374 Invalid = false; 375 } 376 } 377 378 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 379 // hint here. Alternatively, we could walk the type-source information 380 // for NewParam to find the last source location in the type... but it 381 // isn't worth the effort right now. This is the kind of test case that 382 // is hard to get right: 383 // int f(int); 384 // void g(int (*fp)(int) = f); 385 // void g(int (*fp)(int) = &f); 386 Diag(NewParam->getLocation(), DiagDefaultParamID) 387 << NewParam->getDefaultArgRange(); 388 389 // Look for the function declaration where the default argument was 390 // actually written, which may be a declaration prior to Old. 391 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 392 Older; Older = Older->getPreviousDeclaration()) { 393 if (!Older->getParamDecl(p)->hasDefaultArg()) 394 break; 395 396 OldParam = Older->getParamDecl(p); 397 } 398 399 Diag(OldParam->getLocation(), diag::note_previous_definition) 400 << OldParam->getDefaultArgRange(); 401 } else if (OldParam->hasDefaultArg()) { 402 // Merge the old default argument into the new parameter. 403 // It's important to use getInit() here; getDefaultArg() 404 // strips off any top-level ExprWithCleanups. 405 NewParam->setHasInheritedDefaultArg(); 406 if (OldParam->hasUninstantiatedDefaultArg()) 407 NewParam->setUninstantiatedDefaultArg( 408 OldParam->getUninstantiatedDefaultArg()); 409 else 410 NewParam->setDefaultArg(OldParam->getInit()); 411 } else if (NewParam->hasDefaultArg()) { 412 if (New->getDescribedFunctionTemplate()) { 413 // Paragraph 4, quoted above, only applies to non-template functions. 414 Diag(NewParam->getLocation(), 415 diag::err_param_default_argument_template_redecl) 416 << NewParam->getDefaultArgRange(); 417 Diag(Old->getLocation(), diag::note_template_prev_declaration) 418 << false; 419 } else if (New->getTemplateSpecializationKind() 420 != TSK_ImplicitInstantiation && 421 New->getTemplateSpecializationKind() != TSK_Undeclared) { 422 // C++ [temp.expr.spec]p21: 423 // Default function arguments shall not be specified in a declaration 424 // or a definition for one of the following explicit specializations: 425 // - the explicit specialization of a function template; 426 // - the explicit specialization of a member function template; 427 // - the explicit specialization of a member function of a class 428 // template where the class template specialization to which the 429 // member function specialization belongs is implicitly 430 // instantiated. 431 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 432 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 433 << New->getDeclName() 434 << NewParam->getDefaultArgRange(); 435 } else if (New->getDeclContext()->isDependentContext()) { 436 // C++ [dcl.fct.default]p6 (DR217): 437 // Default arguments for a member function of a class template shall 438 // be specified on the initial declaration of the member function 439 // within the class template. 440 // 441 // Reading the tea leaves a bit in DR217 and its reference to DR205 442 // leads me to the conclusion that one cannot add default function 443 // arguments for an out-of-line definition of a member function of a 444 // dependent type. 445 int WhichKind = 2; 446 if (CXXRecordDecl *Record 447 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 448 if (Record->getDescribedClassTemplate()) 449 WhichKind = 0; 450 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 451 WhichKind = 1; 452 else 453 WhichKind = 2; 454 } 455 456 Diag(NewParam->getLocation(), 457 diag::err_param_default_argument_member_template_redecl) 458 << WhichKind 459 << NewParam->getDefaultArgRange(); 460 } 461 } 462 } 463 464 if (CheckEquivalentExceptionSpec(Old, New)) 465 Invalid = true; 466 467 return Invalid; 468} 469 470/// \brief Merge the exception specifications of two variable declarations. 471/// 472/// This is called when there's a redeclaration of a VarDecl. The function 473/// checks if the redeclaration might have an exception specification and 474/// validates compatibility and merges the specs if necessary. 475void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 476 // Shortcut if exceptions are disabled. 477 if (!getLangOptions().CXXExceptions) 478 return; 479 480 assert(Context.hasSameType(New->getType(), Old->getType()) && 481 "Should only be called if types are otherwise the same."); 482 483 QualType NewType = New->getType(); 484 QualType OldType = Old->getType(); 485 486 // We're only interested in pointers and references to functions, as well 487 // as pointers to member functions. 488 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 489 NewType = R->getPointeeType(); 490 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 491 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 492 NewType = P->getPointeeType(); 493 OldType = OldType->getAs<PointerType>()->getPointeeType(); 494 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 495 NewType = M->getPointeeType(); 496 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 497 } 498 499 if (!NewType->isFunctionProtoType()) 500 return; 501 502 // There's lots of special cases for functions. For function pointers, system 503 // libraries are hopefully not as broken so that we don't need these 504 // workarounds. 505 if (CheckEquivalentExceptionSpec( 506 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 507 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 508 New->setInvalidDecl(); 509 } 510} 511 512/// CheckCXXDefaultArguments - Verify that the default arguments for a 513/// function declaration are well-formed according to C++ 514/// [dcl.fct.default]. 515void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 516 unsigned NumParams = FD->getNumParams(); 517 unsigned p; 518 519 // Find first parameter with a default argument 520 for (p = 0; p < NumParams; ++p) { 521 ParmVarDecl *Param = FD->getParamDecl(p); 522 if (Param->hasDefaultArg()) 523 break; 524 } 525 526 // C++ [dcl.fct.default]p4: 527 // In a given function declaration, all parameters 528 // subsequent to a parameter with a default argument shall 529 // have default arguments supplied in this or previous 530 // declarations. A default argument shall not be redefined 531 // by a later declaration (not even to the same value). 532 unsigned LastMissingDefaultArg = 0; 533 for (; p < NumParams; ++p) { 534 ParmVarDecl *Param = FD->getParamDecl(p); 535 if (!Param->hasDefaultArg()) { 536 if (Param->isInvalidDecl()) 537 /* We already complained about this parameter. */; 538 else if (Param->getIdentifier()) 539 Diag(Param->getLocation(), 540 diag::err_param_default_argument_missing_name) 541 << Param->getIdentifier(); 542 else 543 Diag(Param->getLocation(), 544 diag::err_param_default_argument_missing); 545 546 LastMissingDefaultArg = p; 547 } 548 } 549 550 if (LastMissingDefaultArg > 0) { 551 // Some default arguments were missing. Clear out all of the 552 // default arguments up to (and including) the last missing 553 // default argument, so that we leave the function parameters 554 // in a semantically valid state. 555 for (p = 0; p <= LastMissingDefaultArg; ++p) { 556 ParmVarDecl *Param = FD->getParamDecl(p); 557 if (Param->hasDefaultArg()) { 558 Param->setDefaultArg(0); 559 } 560 } 561 } 562} 563 564/// isCurrentClassName - Determine whether the identifier II is the 565/// name of the class type currently being defined. In the case of 566/// nested classes, this will only return true if II is the name of 567/// the innermost class. 568bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 569 const CXXScopeSpec *SS) { 570 assert(getLangOptions().CPlusPlus && "No class names in C!"); 571 572 CXXRecordDecl *CurDecl; 573 if (SS && SS->isSet() && !SS->isInvalid()) { 574 DeclContext *DC = computeDeclContext(*SS, true); 575 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 576 } else 577 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 578 579 if (CurDecl && CurDecl->getIdentifier()) 580 return &II == CurDecl->getIdentifier(); 581 else 582 return false; 583} 584 585/// \brief Check the validity of a C++ base class specifier. 586/// 587/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 588/// and returns NULL otherwise. 589CXXBaseSpecifier * 590Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 591 SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeSourceInfo *TInfo, 594 SourceLocation EllipsisLoc) { 595 QualType BaseType = TInfo->getType(); 596 597 // C++ [class.union]p1: 598 // A union shall not have base classes. 599 if (Class->isUnion()) { 600 Diag(Class->getLocation(), diag::err_base_clause_on_union) 601 << SpecifierRange; 602 return 0; 603 } 604 605 if (EllipsisLoc.isValid() && 606 !TInfo->getType()->containsUnexpandedParameterPack()) { 607 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 608 << TInfo->getTypeLoc().getSourceRange(); 609 EllipsisLoc = SourceLocation(); 610 } 611 612 if (BaseType->isDependentType()) 613 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 614 Class->getTagKind() == TTK_Class, 615 Access, TInfo, EllipsisLoc); 616 617 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 618 619 // Base specifiers must be record types. 620 if (!BaseType->isRecordType()) { 621 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 622 return 0; 623 } 624 625 // C++ [class.union]p1: 626 // A union shall not be used as a base class. 627 if (BaseType->isUnionType()) { 628 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 629 return 0; 630 } 631 632 // C++ [class.derived]p2: 633 // The class-name in a base-specifier shall not be an incompletely 634 // defined class. 635 if (RequireCompleteType(BaseLoc, BaseType, 636 PDiag(diag::err_incomplete_base_class) 637 << SpecifierRange)) { 638 Class->setInvalidDecl(); 639 return 0; 640 } 641 642 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 643 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 644 assert(BaseDecl && "Record type has no declaration"); 645 BaseDecl = BaseDecl->getDefinition(); 646 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 647 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 648 assert(CXXBaseDecl && "Base type is not a C++ type"); 649 650 // C++ [class]p3: 651 // If a class is marked final and it appears as a base-type-specifier in 652 // base-clause, the program is ill-formed. 653 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 654 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 655 << CXXBaseDecl->getDeclName(); 656 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 657 << CXXBaseDecl->getDeclName(); 658 return 0; 659 } 660 661 if (BaseDecl->isInvalidDecl()) 662 Class->setInvalidDecl(); 663 664 // Create the base specifier. 665 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 666 Class->getTagKind() == TTK_Class, 667 Access, TInfo, EllipsisLoc); 668} 669 670/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 671/// one entry in the base class list of a class specifier, for 672/// example: 673/// class foo : public bar, virtual private baz { 674/// 'public bar' and 'virtual private baz' are each base-specifiers. 675BaseResult 676Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 677 bool Virtual, AccessSpecifier Access, 678 ParsedType basetype, SourceLocation BaseLoc, 679 SourceLocation EllipsisLoc) { 680 if (!classdecl) 681 return true; 682 683 AdjustDeclIfTemplate(classdecl); 684 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 685 if (!Class) 686 return true; 687 688 TypeSourceInfo *TInfo = 0; 689 GetTypeFromParser(basetype, &TInfo); 690 691 if (EllipsisLoc.isInvalid() && 692 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 693 UPPC_BaseType)) 694 return true; 695 696 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 697 Virtual, Access, TInfo, 698 EllipsisLoc)) 699 return BaseSpec; 700 701 return true; 702} 703 704/// \brief Performs the actual work of attaching the given base class 705/// specifiers to a C++ class. 706bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 707 unsigned NumBases) { 708 if (NumBases == 0) 709 return false; 710 711 // Used to keep track of which base types we have already seen, so 712 // that we can properly diagnose redundant direct base types. Note 713 // that the key is always the unqualified canonical type of the base 714 // class. 715 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 716 717 // Copy non-redundant base specifiers into permanent storage. 718 unsigned NumGoodBases = 0; 719 bool Invalid = false; 720 for (unsigned idx = 0; idx < NumBases; ++idx) { 721 QualType NewBaseType 722 = Context.getCanonicalType(Bases[idx]->getType()); 723 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 724 if (!Class->hasObjectMember()) { 725 if (const RecordType *FDTTy = 726 NewBaseType.getTypePtr()->getAs<RecordType>()) 727 if (FDTTy->getDecl()->hasObjectMember()) 728 Class->setHasObjectMember(true); 729 } 730 731 if (KnownBaseTypes[NewBaseType]) { 732 // C++ [class.mi]p3: 733 // A class shall not be specified as a direct base class of a 734 // derived class more than once. 735 Diag(Bases[idx]->getSourceRange().getBegin(), 736 diag::err_duplicate_base_class) 737 << KnownBaseTypes[NewBaseType]->getType() 738 << Bases[idx]->getSourceRange(); 739 740 // Delete the duplicate base class specifier; we're going to 741 // overwrite its pointer later. 742 Context.Deallocate(Bases[idx]); 743 744 Invalid = true; 745 } else { 746 // Okay, add this new base class. 747 KnownBaseTypes[NewBaseType] = Bases[idx]; 748 Bases[NumGoodBases++] = Bases[idx]; 749 } 750 } 751 752 // Attach the remaining base class specifiers to the derived class. 753 Class->setBases(Bases, NumGoodBases); 754 755 // Delete the remaining (good) base class specifiers, since their 756 // data has been copied into the CXXRecordDecl. 757 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 758 Context.Deallocate(Bases[idx]); 759 760 return Invalid; 761} 762 763/// ActOnBaseSpecifiers - Attach the given base specifiers to the 764/// class, after checking whether there are any duplicate base 765/// classes. 766void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 767 unsigned NumBases) { 768 if (!ClassDecl || !Bases || !NumBases) 769 return; 770 771 AdjustDeclIfTemplate(ClassDecl); 772 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 773 (CXXBaseSpecifier**)(Bases), NumBases); 774} 775 776static CXXRecordDecl *GetClassForType(QualType T) { 777 if (const RecordType *RT = T->getAs<RecordType>()) 778 return cast<CXXRecordDecl>(RT->getDecl()); 779 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 780 return ICT->getDecl(); 781 else 782 return 0; 783} 784 785/// \brief Determine whether the type \p Derived is a C++ class that is 786/// derived from the type \p Base. 787bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 788 if (!getLangOptions().CPlusPlus) 789 return false; 790 791 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 792 if (!DerivedRD) 793 return false; 794 795 CXXRecordDecl *BaseRD = GetClassForType(Base); 796 if (!BaseRD) 797 return false; 798 799 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 800 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 801} 802 803/// \brief Determine whether the type \p Derived is a C++ class that is 804/// derived from the type \p Base. 805bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 810 if (!DerivedRD) 811 return false; 812 813 CXXRecordDecl *BaseRD = GetClassForType(Base); 814 if (!BaseRD) 815 return false; 816 817 return DerivedRD->isDerivedFrom(BaseRD, Paths); 818} 819 820void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 821 CXXCastPath &BasePathArray) { 822 assert(BasePathArray.empty() && "Base path array must be empty!"); 823 assert(Paths.isRecordingPaths() && "Must record paths!"); 824 825 const CXXBasePath &Path = Paths.front(); 826 827 // We first go backward and check if we have a virtual base. 828 // FIXME: It would be better if CXXBasePath had the base specifier for 829 // the nearest virtual base. 830 unsigned Start = 0; 831 for (unsigned I = Path.size(); I != 0; --I) { 832 if (Path[I - 1].Base->isVirtual()) { 833 Start = I - 1; 834 break; 835 } 836 } 837 838 // Now add all bases. 839 for (unsigned I = Start, E = Path.size(); I != E; ++I) 840 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 841} 842 843/// \brief Determine whether the given base path includes a virtual 844/// base class. 845bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 846 for (CXXCastPath::const_iterator B = BasePath.begin(), 847 BEnd = BasePath.end(); 848 B != BEnd; ++B) 849 if ((*B)->isVirtual()) 850 return true; 851 852 return false; 853} 854 855/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 856/// conversion (where Derived and Base are class types) is 857/// well-formed, meaning that the conversion is unambiguous (and 858/// that all of the base classes are accessible). Returns true 859/// and emits a diagnostic if the code is ill-formed, returns false 860/// otherwise. Loc is the location where this routine should point to 861/// if there is an error, and Range is the source range to highlight 862/// if there is an error. 863bool 864Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 865 unsigned InaccessibleBaseID, 866 unsigned AmbigiousBaseConvID, 867 SourceLocation Loc, SourceRange Range, 868 DeclarationName Name, 869 CXXCastPath *BasePath) { 870 // First, determine whether the path from Derived to Base is 871 // ambiguous. This is slightly more expensive than checking whether 872 // the Derived to Base conversion exists, because here we need to 873 // explore multiple paths to determine if there is an ambiguity. 874 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 875 /*DetectVirtual=*/false); 876 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 877 assert(DerivationOkay && 878 "Can only be used with a derived-to-base conversion"); 879 (void)DerivationOkay; 880 881 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 882 if (InaccessibleBaseID) { 883 // Check that the base class can be accessed. 884 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 885 InaccessibleBaseID)) { 886 case AR_inaccessible: 887 return true; 888 case AR_accessible: 889 case AR_dependent: 890 case AR_delayed: 891 break; 892 } 893 } 894 895 // Build a base path if necessary. 896 if (BasePath) 897 BuildBasePathArray(Paths, *BasePath); 898 return false; 899 } 900 901 // We know that the derived-to-base conversion is ambiguous, and 902 // we're going to produce a diagnostic. Perform the derived-to-base 903 // search just one more time to compute all of the possible paths so 904 // that we can print them out. This is more expensive than any of 905 // the previous derived-to-base checks we've done, but at this point 906 // performance isn't as much of an issue. 907 Paths.clear(); 908 Paths.setRecordingPaths(true); 909 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 910 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 911 (void)StillOkay; 912 913 // Build up a textual representation of the ambiguous paths, e.g., 914 // D -> B -> A, that will be used to illustrate the ambiguous 915 // conversions in the diagnostic. We only print one of the paths 916 // to each base class subobject. 917 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 918 919 Diag(Loc, AmbigiousBaseConvID) 920 << Derived << Base << PathDisplayStr << Range << Name; 921 return true; 922} 923 924bool 925Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 926 SourceLocation Loc, SourceRange Range, 927 CXXCastPath *BasePath, 928 bool IgnoreAccess) { 929 return CheckDerivedToBaseConversion(Derived, Base, 930 IgnoreAccess ? 0 931 : diag::err_upcast_to_inaccessible_base, 932 diag::err_ambiguous_derived_to_base_conv, 933 Loc, Range, DeclarationName(), 934 BasePath); 935} 936 937 938/// @brief Builds a string representing ambiguous paths from a 939/// specific derived class to different subobjects of the same base 940/// class. 941/// 942/// This function builds a string that can be used in error messages 943/// to show the different paths that one can take through the 944/// inheritance hierarchy to go from the derived class to different 945/// subobjects of a base class. The result looks something like this: 946/// @code 947/// struct D -> struct B -> struct A 948/// struct D -> struct C -> struct A 949/// @endcode 950std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 951 std::string PathDisplayStr; 952 std::set<unsigned> DisplayedPaths; 953 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 954 Path != Paths.end(); ++Path) { 955 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 956 // We haven't displayed a path to this particular base 957 // class subobject yet. 958 PathDisplayStr += "\n "; 959 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 960 for (CXXBasePath::const_iterator Element = Path->begin(); 961 Element != Path->end(); ++Element) 962 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 963 } 964 } 965 966 return PathDisplayStr; 967} 968 969//===----------------------------------------------------------------------===// 970// C++ class member Handling 971//===----------------------------------------------------------------------===// 972 973/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 974Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 975 SourceLocation ASLoc, 976 SourceLocation ColonLoc) { 977 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 978 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 979 ASLoc, ColonLoc); 980 CurContext->addHiddenDecl(ASDecl); 981 return ASDecl; 982} 983 984/// CheckOverrideControl - Check C++0x override control semantics. 985void Sema::CheckOverrideControl(const Decl *D) { 986 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 987 if (!MD || !MD->isVirtual()) 988 return; 989 990 if (MD->isDependentContext()) 991 return; 992 993 // C++0x [class.virtual]p3: 994 // If a virtual function is marked with the virt-specifier override and does 995 // not override a member function of a base class, 996 // the program is ill-formed. 997 bool HasOverriddenMethods = 998 MD->begin_overridden_methods() != MD->end_overridden_methods(); 999 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1000 Diag(MD->getLocation(), 1001 diag::err_function_marked_override_not_overriding) 1002 << MD->getDeclName(); 1003 return; 1004 } 1005} 1006 1007/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1008/// function overrides a virtual member function marked 'final', according to 1009/// C++0x [class.virtual]p3. 1010bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1011 const CXXMethodDecl *Old) { 1012 if (!Old->hasAttr<FinalAttr>()) 1013 return false; 1014 1015 Diag(New->getLocation(), diag::err_final_function_overridden) 1016 << New->getDeclName(); 1017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1018 return true; 1019} 1020 1021/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1022/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1023/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1024/// any. 1025Decl * 1026Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1027 MultiTemplateParamsArg TemplateParameterLists, 1028 ExprTy *BW, const VirtSpecifiers &VS, 1029 ExprTy *InitExpr, bool IsDefinition) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (SS.isSet() && !SS.isInvalid()) { 1095 // The user provided a superfluous scope specifier inside a class 1096 // definition: 1097 // 1098 // class X { 1099 // int X::member; 1100 // }; 1101 DeclContext *DC = 0; 1102 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1103 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1104 << Name << FixItHint::CreateRemoval(SS.getRange()); 1105 else 1106 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1107 << Name << SS.getRange(); 1108 1109 SS.clear(); 1110 } 1111 1112 // FIXME: Check for template parameters! 1113 // FIXME: Check that the name is an identifier! 1114 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1115 AS); 1116 assert(Member && "HandleField never returns null"); 1117 } else { 1118 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1119 if (!Member) { 1120 return 0; 1121 } 1122 1123 // Non-instance-fields can't have a bitfield. 1124 if (BitWidth) { 1125 if (Member->isInvalidDecl()) { 1126 // don't emit another diagnostic. 1127 } else if (isa<VarDecl>(Member)) { 1128 // C++ 9.6p3: A bit-field shall not be a static member. 1129 // "static member 'A' cannot be a bit-field" 1130 Diag(Loc, diag::err_static_not_bitfield) 1131 << Name << BitWidth->getSourceRange(); 1132 } else if (isa<TypedefDecl>(Member)) { 1133 // "typedef member 'x' cannot be a bit-field" 1134 Diag(Loc, diag::err_typedef_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else { 1137 // A function typedef ("typedef int f(); f a;"). 1138 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1139 Diag(Loc, diag::err_not_integral_type_bitfield) 1140 << Name << cast<ValueDecl>(Member)->getType() 1141 << BitWidth->getSourceRange(); 1142 } 1143 1144 BitWidth = 0; 1145 Member->setInvalidDecl(); 1146 } 1147 1148 Member->setAccess(AS); 1149 1150 // If we have declared a member function template, set the access of the 1151 // templated declaration as well. 1152 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1153 FunTmpl->getTemplatedDecl()->setAccess(AS); 1154 } 1155 1156 if (VS.isOverrideSpecified()) { 1157 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1158 if (!MD || !MD->isVirtual()) { 1159 Diag(Member->getLocStart(), 1160 diag::override_keyword_only_allowed_on_virtual_member_functions) 1161 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1162 } else 1163 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1164 } 1165 if (VS.isFinalSpecified()) { 1166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1167 if (!MD || !MD->isVirtual()) { 1168 Diag(Member->getLocStart(), 1169 diag::override_keyword_only_allowed_on_virtual_member_functions) 1170 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1171 } else 1172 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1173 } 1174 1175 if (VS.getLastLocation().isValid()) { 1176 // Update the end location of a method that has a virt-specifiers. 1177 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1178 MD->setRangeEnd(VS.getLastLocation()); 1179 } 1180 1181 CheckOverrideControl(Member); 1182 1183 assert((Name || isInstField) && "No identifier for non-field ?"); 1184 1185 if (Init) 1186 AddInitializerToDecl(Member, Init, false, 1187 DS.getTypeSpecType() == DeclSpec::TST_auto); 1188 1189 FinalizeDeclaration(Member); 1190 1191 if (isInstField) 1192 FieldCollector->Add(cast<FieldDecl>(Member)); 1193 return Member; 1194} 1195 1196/// \brief Find the direct and/or virtual base specifiers that 1197/// correspond to the given base type, for use in base initialization 1198/// within a constructor. 1199static bool FindBaseInitializer(Sema &SemaRef, 1200 CXXRecordDecl *ClassDecl, 1201 QualType BaseType, 1202 const CXXBaseSpecifier *&DirectBaseSpec, 1203 const CXXBaseSpecifier *&VirtualBaseSpec) { 1204 // First, check for a direct base class. 1205 DirectBaseSpec = 0; 1206 for (CXXRecordDecl::base_class_const_iterator Base 1207 = ClassDecl->bases_begin(); 1208 Base != ClassDecl->bases_end(); ++Base) { 1209 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1210 // We found a direct base of this type. That's what we're 1211 // initializing. 1212 DirectBaseSpec = &*Base; 1213 break; 1214 } 1215 } 1216 1217 // Check for a virtual base class. 1218 // FIXME: We might be able to short-circuit this if we know in advance that 1219 // there are no virtual bases. 1220 VirtualBaseSpec = 0; 1221 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1222 // We haven't found a base yet; search the class hierarchy for a 1223 // virtual base class. 1224 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1225 /*DetectVirtual=*/false); 1226 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1227 BaseType, Paths)) { 1228 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1229 Path != Paths.end(); ++Path) { 1230 if (Path->back().Base->isVirtual()) { 1231 VirtualBaseSpec = Path->back().Base; 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 1238 return DirectBaseSpec || VirtualBaseSpec; 1239} 1240 1241/// ActOnMemInitializer - Handle a C++ member initializer. 1242MemInitResult 1243Sema::ActOnMemInitializer(Decl *ConstructorD, 1244 Scope *S, 1245 CXXScopeSpec &SS, 1246 IdentifierInfo *MemberOrBase, 1247 ParsedType TemplateTypeTy, 1248 SourceLocation IdLoc, 1249 SourceLocation LParenLoc, 1250 ExprTy **Args, unsigned NumArgs, 1251 SourceLocation RParenLoc, 1252 SourceLocation EllipsisLoc) { 1253 if (!ConstructorD) 1254 return true; 1255 1256 AdjustDeclIfTemplate(ConstructorD); 1257 1258 CXXConstructorDecl *Constructor 1259 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1260 if (!Constructor) { 1261 // The user wrote a constructor initializer on a function that is 1262 // not a C++ constructor. Ignore the error for now, because we may 1263 // have more member initializers coming; we'll diagnose it just 1264 // once in ActOnMemInitializers. 1265 return true; 1266 } 1267 1268 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1269 1270 // C++ [class.base.init]p2: 1271 // Names in a mem-initializer-id are looked up in the scope of the 1272 // constructor's class and, if not found in that scope, are looked 1273 // up in the scope containing the constructor's definition. 1274 // [Note: if the constructor's class contains a member with the 1275 // same name as a direct or virtual base class of the class, a 1276 // mem-initializer-id naming the member or base class and composed 1277 // of a single identifier refers to the class member. A 1278 // mem-initializer-id for the hidden base class may be specified 1279 // using a qualified name. ] 1280 if (!SS.getScopeRep() && !TemplateTypeTy) { 1281 // Look for a member, first. 1282 FieldDecl *Member = 0; 1283 DeclContext::lookup_result Result 1284 = ClassDecl->lookup(MemberOrBase); 1285 if (Result.first != Result.second) { 1286 Member = dyn_cast<FieldDecl>(*Result.first); 1287 1288 if (Member) { 1289 if (EllipsisLoc.isValid()) 1290 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1291 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1292 1293 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1294 LParenLoc, RParenLoc); 1295 } 1296 1297 // Handle anonymous union case. 1298 if (IndirectFieldDecl* IndirectField 1299 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1300 if (EllipsisLoc.isValid()) 1301 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1302 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1303 1304 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1305 NumArgs, IdLoc, 1306 LParenLoc, RParenLoc); 1307 } 1308 } 1309 } 1310 // It didn't name a member, so see if it names a class. 1311 QualType BaseType; 1312 TypeSourceInfo *TInfo = 0; 1313 1314 if (TemplateTypeTy) { 1315 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1316 } else { 1317 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1318 LookupParsedName(R, S, &SS); 1319 1320 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1321 if (!TyD) { 1322 if (R.isAmbiguous()) return true; 1323 1324 // We don't want access-control diagnostics here. 1325 R.suppressDiagnostics(); 1326 1327 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1328 bool NotUnknownSpecialization = false; 1329 DeclContext *DC = computeDeclContext(SS, false); 1330 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1331 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1332 1333 if (!NotUnknownSpecialization) { 1334 // When the scope specifier can refer to a member of an unknown 1335 // specialization, we take it as a type name. 1336 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1337 SS.getWithLocInContext(Context), 1338 *MemberOrBase, IdLoc); 1339 if (BaseType.isNull()) 1340 return true; 1341 1342 R.clear(); 1343 R.setLookupName(MemberOrBase); 1344 } 1345 } 1346 1347 // If no results were found, try to correct typos. 1348 if (R.empty() && BaseType.isNull() && 1349 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1350 R.isSingleResult()) { 1351 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1352 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1353 // We have found a non-static data member with a similar 1354 // name to what was typed; complain and initialize that 1355 // member. 1356 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1357 << MemberOrBase << true << R.getLookupName() 1358 << FixItHint::CreateReplacement(R.getNameLoc(), 1359 R.getLookupName().getAsString()); 1360 Diag(Member->getLocation(), diag::note_previous_decl) 1361 << Member->getDeclName(); 1362 1363 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1364 LParenLoc, RParenLoc); 1365 } 1366 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1367 const CXXBaseSpecifier *DirectBaseSpec; 1368 const CXXBaseSpecifier *VirtualBaseSpec; 1369 if (FindBaseInitializer(*this, ClassDecl, 1370 Context.getTypeDeclType(Type), 1371 DirectBaseSpec, VirtualBaseSpec)) { 1372 // We have found a direct or virtual base class with a 1373 // similar name to what was typed; complain and initialize 1374 // that base class. 1375 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1376 << MemberOrBase << false << R.getLookupName() 1377 << FixItHint::CreateReplacement(R.getNameLoc(), 1378 R.getLookupName().getAsString()); 1379 1380 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1381 : VirtualBaseSpec; 1382 Diag(BaseSpec->getSourceRange().getBegin(), 1383 diag::note_base_class_specified_here) 1384 << BaseSpec->getType() 1385 << BaseSpec->getSourceRange(); 1386 1387 TyD = Type; 1388 } 1389 } 1390 } 1391 1392 if (!TyD && BaseType.isNull()) { 1393 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1394 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1395 return true; 1396 } 1397 } 1398 1399 if (BaseType.isNull()) { 1400 BaseType = Context.getTypeDeclType(TyD); 1401 if (SS.isSet()) { 1402 NestedNameSpecifier *Qualifier = 1403 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1404 1405 // FIXME: preserve source range information 1406 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1407 } 1408 } 1409 } 1410 1411 if (!TInfo) 1412 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1413 1414 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1415 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1416} 1417 1418/// Checks an initializer expression for use of uninitialized fields, such as 1419/// containing the field that is being initialized. Returns true if there is an 1420/// uninitialized field was used an updates the SourceLocation parameter; false 1421/// otherwise. 1422static bool InitExprContainsUninitializedFields(const Stmt *S, 1423 const ValueDecl *LhsField, 1424 SourceLocation *L) { 1425 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1426 1427 if (isa<CallExpr>(S)) { 1428 // Do not descend into function calls or constructors, as the use 1429 // of an uninitialized field may be valid. One would have to inspect 1430 // the contents of the function/ctor to determine if it is safe or not. 1431 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1432 // may be safe, depending on what the function/ctor does. 1433 return false; 1434 } 1435 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1436 const NamedDecl *RhsField = ME->getMemberDecl(); 1437 1438 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1439 // The member expression points to a static data member. 1440 assert(VD->isStaticDataMember() && 1441 "Member points to non-static data member!"); 1442 (void)VD; 1443 return false; 1444 } 1445 1446 if (isa<EnumConstantDecl>(RhsField)) { 1447 // The member expression points to an enum. 1448 return false; 1449 } 1450 1451 if (RhsField == LhsField) { 1452 // Initializing a field with itself. Throw a warning. 1453 // But wait; there are exceptions! 1454 // Exception #1: The field may not belong to this record. 1455 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1456 const Expr *base = ME->getBase(); 1457 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1458 // Even though the field matches, it does not belong to this record. 1459 return false; 1460 } 1461 // None of the exceptions triggered; return true to indicate an 1462 // uninitialized field was used. 1463 *L = ME->getMemberLoc(); 1464 return true; 1465 } 1466 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1467 // sizeof/alignof doesn't reference contents, do not warn. 1468 return false; 1469 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1470 // address-of doesn't reference contents (the pointer may be dereferenced 1471 // in the same expression but it would be rare; and weird). 1472 if (UOE->getOpcode() == UO_AddrOf) 1473 return false; 1474 } 1475 for (Stmt::const_child_range it = S->children(); it; ++it) { 1476 if (!*it) { 1477 // An expression such as 'member(arg ?: "")' may trigger this. 1478 continue; 1479 } 1480 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1481 return true; 1482 } 1483 return false; 1484} 1485 1486MemInitResult 1487Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1488 unsigned NumArgs, SourceLocation IdLoc, 1489 SourceLocation LParenLoc, 1490 SourceLocation RParenLoc) { 1491 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1492 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1493 assert((DirectMember || IndirectMember) && 1494 "Member must be a FieldDecl or IndirectFieldDecl"); 1495 1496 if (Member->isInvalidDecl()) 1497 return true; 1498 1499 // Diagnose value-uses of fields to initialize themselves, e.g. 1500 // foo(foo) 1501 // where foo is not also a parameter to the constructor. 1502 // TODO: implement -Wuninitialized and fold this into that framework. 1503 for (unsigned i = 0; i < NumArgs; ++i) { 1504 SourceLocation L; 1505 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1506 // FIXME: Return true in the case when other fields are used before being 1507 // uninitialized. For example, let this field be the i'th field. When 1508 // initializing the i'th field, throw a warning if any of the >= i'th 1509 // fields are used, as they are not yet initialized. 1510 // Right now we are only handling the case where the i'th field uses 1511 // itself in its initializer. 1512 Diag(L, diag::warn_field_is_uninit); 1513 } 1514 } 1515 1516 bool HasDependentArg = false; 1517 for (unsigned i = 0; i < NumArgs; i++) 1518 HasDependentArg |= Args[i]->isTypeDependent(); 1519 1520 Expr *Init; 1521 if (Member->getType()->isDependentType() || HasDependentArg) { 1522 // Can't check initialization for a member of dependent type or when 1523 // any of the arguments are type-dependent expressions. 1524 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1525 RParenLoc); 1526 1527 // Erase any temporaries within this evaluation context; we're not 1528 // going to track them in the AST, since we'll be rebuilding the 1529 // ASTs during template instantiation. 1530 ExprTemporaries.erase( 1531 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1532 ExprTemporaries.end()); 1533 } else { 1534 // Initialize the member. 1535 InitializedEntity MemberEntity = 1536 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1537 : InitializedEntity::InitializeMember(IndirectMember, 0); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1542 1543 ExprResult MemberInit = 1544 InitSeq.Perform(*this, MemberEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (MemberInit.isInvalid()) 1547 return true; 1548 1549 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1550 1551 // C++0x [class.base.init]p7: 1552 // The initialization of each base and member constitutes a 1553 // full-expression. 1554 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 // If we are in a dependent context, template instantiation will 1559 // perform this type-checking again. Just save the arguments that we 1560 // received in a ParenListExpr. 1561 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1562 // of the information that we have about the member 1563 // initializer. However, deconstructing the ASTs is a dicey process, 1564 // and this approach is far more likely to get the corner cases right. 1565 if (CurContext->isDependentContext()) 1566 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1567 RParenLoc); 1568 else 1569 Init = MemberInit.get(); 1570 } 1571 1572 if (DirectMember) { 1573 return new (Context) CXXCtorInitializer(Context, DirectMember, 1574 IdLoc, LParenLoc, Init, 1575 RParenLoc); 1576 } else { 1577 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1578 IdLoc, LParenLoc, Init, 1579 RParenLoc); 1580 } 1581} 1582 1583MemInitResult 1584Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation NameLoc, 1587 SourceLocation LParenLoc, 1588 SourceLocation RParenLoc, 1589 CXXRecordDecl *ClassDecl) { 1590 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1591 if (!LangOpts.CPlusPlus0x) 1592 return Diag(Loc, diag::err_delegation_0x_only) 1593 << TInfo->getTypeLoc().getLocalSourceRange(); 1594 1595 // Initialize the object. 1596 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1597 QualType(ClassDecl->getTypeForDecl(), 0)); 1598 InitializationKind Kind = 1599 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1600 1601 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1602 1603 ExprResult DelegationInit = 1604 InitSeq.Perform(*this, DelegationEntity, Kind, 1605 MultiExprArg(*this, Args, NumArgs), 0); 1606 if (DelegationInit.isInvalid()) 1607 return true; 1608 1609 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1610 CXXConstructorDecl *Constructor 1611 = ConExpr->getConstructor(); 1612 assert(Constructor && "Delegating constructor with no target?"); 1613 1614 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1615 1616 // C++0x [class.base.init]p7: 1617 // The initialization of each base and member constitutes a 1618 // full-expression. 1619 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1620 if (DelegationInit.isInvalid()) 1621 return true; 1622 1623 // If we are in a dependent context, template instantiation will 1624 // perform this type-checking again. Just save the arguments that we 1625 // received in a ParenListExpr. 1626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1627 // of the information that we have about the base 1628 // initializer. However, deconstructing the ASTs is a dicey process, 1629 // and this approach is far more likely to get the corner cases right. 1630 if (CurContext->isDependentContext()) { 1631 ExprResult Init 1632 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1633 NumArgs, RParenLoc)); 1634 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1635 Constructor, Init.takeAs<Expr>(), 1636 RParenLoc); 1637 } 1638 1639 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1640 DelegationInit.takeAs<Expr>(), 1641 RParenLoc); 1642} 1643 1644MemInitResult 1645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1646 Expr **Args, unsigned NumArgs, 1647 SourceLocation LParenLoc, SourceLocation RParenLoc, 1648 CXXRecordDecl *ClassDecl, 1649 SourceLocation EllipsisLoc) { 1650 bool HasDependentArg = false; 1651 for (unsigned i = 0; i < NumArgs; i++) 1652 HasDependentArg |= Args[i]->isTypeDependent(); 1653 1654 SourceLocation BaseLoc 1655 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1656 1657 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1658 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1659 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1660 1661 // C++ [class.base.init]p2: 1662 // [...] Unless the mem-initializer-id names a nonstatic data 1663 // member of the constructor's class or a direct or virtual base 1664 // of that class, the mem-initializer is ill-formed. A 1665 // mem-initializer-list can initialize a base class using any 1666 // name that denotes that base class type. 1667 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1668 1669 if (EllipsisLoc.isValid()) { 1670 // This is a pack expansion. 1671 if (!BaseType->containsUnexpandedParameterPack()) { 1672 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1673 << SourceRange(BaseLoc, RParenLoc); 1674 1675 EllipsisLoc = SourceLocation(); 1676 } 1677 } else { 1678 // Check for any unexpanded parameter packs. 1679 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1680 return true; 1681 1682 for (unsigned I = 0; I != NumArgs; ++I) 1683 if (DiagnoseUnexpandedParameterPack(Args[I])) 1684 return true; 1685 } 1686 1687 // Check for direct and virtual base classes. 1688 const CXXBaseSpecifier *DirectBaseSpec = 0; 1689 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1690 if (!Dependent) { 1691 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1692 BaseType)) 1693 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1694 LParenLoc, RParenLoc, ClassDecl); 1695 1696 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1697 VirtualBaseSpec); 1698 1699 // C++ [base.class.init]p2: 1700 // Unless the mem-initializer-id names a nonstatic data member of the 1701 // constructor's class or a direct or virtual base of that class, the 1702 // mem-initializer is ill-formed. 1703 if (!DirectBaseSpec && !VirtualBaseSpec) { 1704 // If the class has any dependent bases, then it's possible that 1705 // one of those types will resolve to the same type as 1706 // BaseType. Therefore, just treat this as a dependent base 1707 // class initialization. FIXME: Should we try to check the 1708 // initialization anyway? It seems odd. 1709 if (ClassDecl->hasAnyDependentBases()) 1710 Dependent = true; 1711 else 1712 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1713 << BaseType << Context.getTypeDeclType(ClassDecl) 1714 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1715 } 1716 } 1717 1718 if (Dependent) { 1719 // Can't check initialization for a base of dependent type or when 1720 // any of the arguments are type-dependent expressions. 1721 ExprResult BaseInit 1722 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1723 RParenLoc)); 1724 1725 // Erase any temporaries within this evaluation context; we're not 1726 // going to track them in the AST, since we'll be rebuilding the 1727 // ASTs during template instantiation. 1728 ExprTemporaries.erase( 1729 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1730 ExprTemporaries.end()); 1731 1732 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1733 /*IsVirtual=*/false, 1734 LParenLoc, 1735 BaseInit.takeAs<Expr>(), 1736 RParenLoc, 1737 EllipsisLoc); 1738 } 1739 1740 // C++ [base.class.init]p2: 1741 // If a mem-initializer-id is ambiguous because it designates both 1742 // a direct non-virtual base class and an inherited virtual base 1743 // class, the mem-initializer is ill-formed. 1744 if (DirectBaseSpec && VirtualBaseSpec) 1745 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1746 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1747 1748 CXXBaseSpecifier *BaseSpec 1749 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1750 if (!BaseSpec) 1751 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1752 1753 // Initialize the base. 1754 InitializedEntity BaseEntity = 1755 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1756 InitializationKind Kind = 1757 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1758 1759 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1760 1761 ExprResult BaseInit = 1762 InitSeq.Perform(*this, BaseEntity, Kind, 1763 MultiExprArg(*this, Args, NumArgs), 0); 1764 if (BaseInit.isInvalid()) 1765 return true; 1766 1767 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1768 1769 // C++0x [class.base.init]p7: 1770 // The initialization of each base and member constitutes a 1771 // full-expression. 1772 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 // If we are in a dependent context, template instantiation will 1777 // perform this type-checking again. Just save the arguments that we 1778 // received in a ParenListExpr. 1779 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1780 // of the information that we have about the base 1781 // initializer. However, deconstructing the ASTs is a dicey process, 1782 // and this approach is far more likely to get the corner cases right. 1783 if (CurContext->isDependentContext()) { 1784 ExprResult Init 1785 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1786 RParenLoc)); 1787 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1788 BaseSpec->isVirtual(), 1789 LParenLoc, 1790 Init.takeAs<Expr>(), 1791 RParenLoc, 1792 EllipsisLoc); 1793 } 1794 1795 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1796 BaseSpec->isVirtual(), 1797 LParenLoc, 1798 BaseInit.takeAs<Expr>(), 1799 RParenLoc, 1800 EllipsisLoc); 1801} 1802 1803/// ImplicitInitializerKind - How an implicit base or member initializer should 1804/// initialize its base or member. 1805enum ImplicitInitializerKind { 1806 IIK_Default, 1807 IIK_Copy, 1808 IIK_Move 1809}; 1810 1811static bool 1812BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1813 ImplicitInitializerKind ImplicitInitKind, 1814 CXXBaseSpecifier *BaseSpec, 1815 bool IsInheritedVirtualBase, 1816 CXXCtorInitializer *&CXXBaseInit) { 1817 InitializedEntity InitEntity 1818 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1819 IsInheritedVirtualBase); 1820 1821 ExprResult BaseInit; 1822 1823 switch (ImplicitInitKind) { 1824 case IIK_Default: { 1825 InitializationKind InitKind 1826 = InitializationKind::CreateDefault(Constructor->getLocation()); 1827 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1828 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1829 MultiExprArg(SemaRef, 0, 0)); 1830 break; 1831 } 1832 1833 case IIK_Copy: { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *CopyCtorArg = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Constructor->getLocation(), ParamType, 1840 VK_LValue, 0); 1841 1842 // Cast to the base class to avoid ambiguities. 1843 QualType ArgTy = 1844 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1845 ParamType.getQualifiers()); 1846 1847 CXXCastPath BasePath; 1848 BasePath.push_back(BaseSpec); 1849 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1850 CK_UncheckedDerivedToBase, 1851 VK_LValue, &BasePath).take(); 1852 1853 InitializationKind InitKind 1854 = InitializationKind::CreateDirect(Constructor->getLocation(), 1855 SourceLocation(), SourceLocation()); 1856 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1857 &CopyCtorArg, 1); 1858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1859 MultiExprArg(&CopyCtorArg, 1)); 1860 break; 1861 } 1862 1863 case IIK_Move: 1864 assert(false && "Unhandled initializer kind!"); 1865 } 1866 1867 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 CXXBaseInit = 1872 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1873 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1874 SourceLocation()), 1875 BaseSpec->isVirtual(), 1876 SourceLocation(), 1877 BaseInit.takeAs<Expr>(), 1878 SourceLocation(), 1879 SourceLocation()); 1880 1881 return false; 1882} 1883 1884static bool 1885BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 FieldDecl *Field, 1888 CXXCtorInitializer *&CXXMemberInit) { 1889 if (Field->isInvalidDecl()) 1890 return true; 1891 1892 SourceLocation Loc = Constructor->getLocation(); 1893 1894 if (ImplicitInitKind == IIK_Copy) { 1895 ParmVarDecl *Param = Constructor->getParamDecl(0); 1896 QualType ParamType = Param->getType().getNonReferenceType(); 1897 1898 Expr *MemberExprBase = 1899 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1900 Loc, ParamType, VK_LValue, 0); 1901 1902 // Build a reference to this field within the parameter. 1903 CXXScopeSpec SS; 1904 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1905 Sema::LookupMemberName); 1906 MemberLookup.addDecl(Field, AS_public); 1907 MemberLookup.resolveKind(); 1908 ExprResult CopyCtorArg 1909 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1910 ParamType, Loc, 1911 /*IsArrow=*/false, 1912 SS, 1913 /*FirstQualifierInScope=*/0, 1914 MemberLookup, 1915 /*TemplateArgs=*/0); 1916 if (CopyCtorArg.isInvalid()) 1917 return true; 1918 1919 // When the field we are copying is an array, create index variables for 1920 // each dimension of the array. We use these index variables to subscript 1921 // the source array, and other clients (e.g., CodeGen) will perform the 1922 // necessary iteration with these index variables. 1923 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1924 QualType BaseType = Field->getType(); 1925 QualType SizeType = SemaRef.Context.getSizeType(); 1926 while (const ConstantArrayType *Array 1927 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1928 // Create the iteration variable for this array index. 1929 IdentifierInfo *IterationVarName = 0; 1930 { 1931 llvm::SmallString<8> Str; 1932 llvm::raw_svector_ostream OS(Str); 1933 OS << "__i" << IndexVariables.size(); 1934 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1935 } 1936 VarDecl *IterationVar 1937 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1938 IterationVarName, SizeType, 1939 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1940 SC_None, SC_None); 1941 IndexVariables.push_back(IterationVar); 1942 1943 // Create a reference to the iteration variable. 1944 ExprResult IterationVarRef 1945 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1946 assert(!IterationVarRef.isInvalid() && 1947 "Reference to invented variable cannot fail!"); 1948 1949 // Subscript the array with this iteration variable. 1950 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1951 Loc, 1952 IterationVarRef.take(), 1953 Loc); 1954 if (CopyCtorArg.isInvalid()) 1955 return true; 1956 1957 BaseType = Array->getElementType(); 1958 } 1959 1960 // Construct the entity that we will be initializing. For an array, this 1961 // will be first element in the array, which may require several levels 1962 // of array-subscript entities. 1963 llvm::SmallVector<InitializedEntity, 4> Entities; 1964 Entities.reserve(1 + IndexVariables.size()); 1965 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1966 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1967 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1968 0, 1969 Entities.back())); 1970 1971 // Direct-initialize to use the copy constructor. 1972 InitializationKind InitKind = 1973 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1974 1975 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1976 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1977 &CopyCtorArgE, 1); 1978 1979 ExprResult MemberInit 1980 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1981 MultiExprArg(&CopyCtorArgE, 1)); 1982 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1983 if (MemberInit.isInvalid()) 1984 return true; 1985 1986 CXXMemberInit 1987 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1988 MemberInit.takeAs<Expr>(), Loc, 1989 IndexVariables.data(), 1990 IndexVariables.size()); 1991 return false; 1992 } 1993 1994 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1995 1996 QualType FieldBaseElementType = 1997 SemaRef.Context.getBaseElementType(Field->getType()); 1998 1999 if (FieldBaseElementType->isRecordType()) { 2000 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2001 InitializationKind InitKind = 2002 InitializationKind::CreateDefault(Loc); 2003 2004 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2005 ExprResult MemberInit = 2006 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2007 2008 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2009 if (MemberInit.isInvalid()) 2010 return true; 2011 2012 CXXMemberInit = 2013 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2014 Field, Loc, Loc, 2015 MemberInit.get(), 2016 Loc); 2017 return false; 2018 } 2019 2020 if (!Field->getParent()->isUnion()) { 2021 if (FieldBaseElementType->isReferenceType()) { 2022 SemaRef.Diag(Constructor->getLocation(), 2023 diag::err_uninitialized_member_in_ctor) 2024 << (int)Constructor->isImplicit() 2025 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2026 << 0 << Field->getDeclName(); 2027 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2028 return true; 2029 } 2030 2031 if (FieldBaseElementType.isConstQualified()) { 2032 SemaRef.Diag(Constructor->getLocation(), 2033 diag::err_uninitialized_member_in_ctor) 2034 << (int)Constructor->isImplicit() 2035 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2036 << 1 << Field->getDeclName(); 2037 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2038 return true; 2039 } 2040 } 2041 2042 // Nothing to initialize. 2043 CXXMemberInit = 0; 2044 return false; 2045} 2046 2047namespace { 2048struct BaseAndFieldInfo { 2049 Sema &S; 2050 CXXConstructorDecl *Ctor; 2051 bool AnyErrorsInInits; 2052 ImplicitInitializerKind IIK; 2053 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2054 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2055 2056 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2057 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2058 // FIXME: Handle implicit move constructors. 2059 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2060 IIK = IIK_Copy; 2061 else 2062 IIK = IIK_Default; 2063 } 2064}; 2065} 2066 2067static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2068 FieldDecl *Top, FieldDecl *Field) { 2069 2070 // Overwhelmingly common case: we have a direct initializer for this field. 2071 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2072 Info.AllToInit.push_back(Init); 2073 return false; 2074 } 2075 2076 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2077 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2078 assert(FieldClassType && "anonymous struct/union without record type"); 2079 CXXRecordDecl *FieldClassDecl 2080 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2081 2082 // Even though union members never have non-trivial default 2083 // constructions in C++03, we still build member initializers for aggregate 2084 // record types which can be union members, and C++0x allows non-trivial 2085 // default constructors for union members, so we ensure that only one 2086 // member is initialized for these. 2087 if (FieldClassDecl->isUnion()) { 2088 // First check for an explicit initializer for one field. 2089 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2090 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2091 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2092 Info.AllToInit.push_back(Init); 2093 2094 // Once we've initialized a field of an anonymous union, the union 2095 // field in the class is also initialized, so exit immediately. 2096 return false; 2097 } else if ((*FA)->isAnonymousStructOrUnion()) { 2098 if (CollectFieldInitializer(Info, Top, *FA)) 2099 return true; 2100 } 2101 } 2102 2103 // Fallthrough and construct a default initializer for the union as 2104 // a whole, which can call its default constructor if such a thing exists 2105 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2106 // behavior going forward with C++0x, when anonymous unions there are 2107 // finalized, we should revisit this. 2108 } else { 2109 // For structs, we simply descend through to initialize all members where 2110 // necessary. 2111 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2112 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2113 if (CollectFieldInitializer(Info, Top, *FA)) 2114 return true; 2115 } 2116 } 2117 } 2118 2119 // Don't try to build an implicit initializer if there were semantic 2120 // errors in any of the initializers (and therefore we might be 2121 // missing some that the user actually wrote). 2122 if (Info.AnyErrorsInInits) 2123 return false; 2124 2125 CXXCtorInitializer *Init = 0; 2126 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2127 return true; 2128 2129 if (Init) 2130 Info.AllToInit.push_back(Init); 2131 2132 return false; 2133} 2134 2135bool 2136Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2137 CXXCtorInitializer *Initializer) { 2138 assert(Initializer->isDelegatingInitializer()); 2139 Constructor->setNumCtorInitializers(1); 2140 CXXCtorInitializer **initializer = 2141 new (Context) CXXCtorInitializer*[1]; 2142 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2143 Constructor->setCtorInitializers(initializer); 2144 2145 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2146 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2147 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2148 } 2149 2150 DelegatingCtorDecls.push_back(Constructor); 2151 2152 return false; 2153} 2154 2155bool 2156Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2157 CXXCtorInitializer **Initializers, 2158 unsigned NumInitializers, 2159 bool AnyErrors) { 2160 if (Constructor->getDeclContext()->isDependentContext()) { 2161 // Just store the initializers as written, they will be checked during 2162 // instantiation. 2163 if (NumInitializers > 0) { 2164 Constructor->setNumCtorInitializers(NumInitializers); 2165 CXXCtorInitializer **baseOrMemberInitializers = 2166 new (Context) CXXCtorInitializer*[NumInitializers]; 2167 memcpy(baseOrMemberInitializers, Initializers, 2168 NumInitializers * sizeof(CXXCtorInitializer*)); 2169 Constructor->setCtorInitializers(baseOrMemberInitializers); 2170 } 2171 2172 return false; 2173 } 2174 2175 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2176 2177 // We need to build the initializer AST according to order of construction 2178 // and not what user specified in the Initializers list. 2179 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2180 if (!ClassDecl) 2181 return true; 2182 2183 bool HadError = false; 2184 2185 for (unsigned i = 0; i < NumInitializers; i++) { 2186 CXXCtorInitializer *Member = Initializers[i]; 2187 2188 if (Member->isBaseInitializer()) 2189 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2190 else 2191 Info.AllBaseFields[Member->getAnyMember()] = Member; 2192 } 2193 2194 // Keep track of the direct virtual bases. 2195 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2196 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2197 E = ClassDecl->bases_end(); I != E; ++I) { 2198 if (I->isVirtual()) 2199 DirectVBases.insert(I); 2200 } 2201 2202 // Push virtual bases before others. 2203 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2204 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2205 2206 if (CXXCtorInitializer *Value 2207 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2208 Info.AllToInit.push_back(Value); 2209 } else if (!AnyErrors) { 2210 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2211 CXXCtorInitializer *CXXBaseInit; 2212 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2213 VBase, IsInheritedVirtualBase, 2214 CXXBaseInit)) { 2215 HadError = true; 2216 continue; 2217 } 2218 2219 Info.AllToInit.push_back(CXXBaseInit); 2220 } 2221 } 2222 2223 // Non-virtual bases. 2224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2225 E = ClassDecl->bases_end(); Base != E; ++Base) { 2226 // Virtuals are in the virtual base list and already constructed. 2227 if (Base->isVirtual()) 2228 continue; 2229 2230 if (CXXCtorInitializer *Value 2231 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2232 Info.AllToInit.push_back(Value); 2233 } else if (!AnyErrors) { 2234 CXXCtorInitializer *CXXBaseInit; 2235 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2236 Base, /*IsInheritedVirtualBase=*/false, 2237 CXXBaseInit)) { 2238 HadError = true; 2239 continue; 2240 } 2241 2242 Info.AllToInit.push_back(CXXBaseInit); 2243 } 2244 } 2245 2246 // Fields. 2247 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2248 E = ClassDecl->field_end(); Field != E; ++Field) { 2249 if ((*Field)->getType()->isIncompleteArrayType()) { 2250 assert(ClassDecl->hasFlexibleArrayMember() && 2251 "Incomplete array type is not valid"); 2252 continue; 2253 } 2254 if (CollectFieldInitializer(Info, *Field, *Field)) 2255 HadError = true; 2256 } 2257 2258 NumInitializers = Info.AllToInit.size(); 2259 if (NumInitializers > 0) { 2260 Constructor->setNumCtorInitializers(NumInitializers); 2261 CXXCtorInitializer **baseOrMemberInitializers = 2262 new (Context) CXXCtorInitializer*[NumInitializers]; 2263 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2264 NumInitializers * sizeof(CXXCtorInitializer*)); 2265 Constructor->setCtorInitializers(baseOrMemberInitializers); 2266 2267 // Constructors implicitly reference the base and member 2268 // destructors. 2269 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2270 Constructor->getParent()); 2271 } 2272 2273 return HadError; 2274} 2275 2276static void *GetKeyForTopLevelField(FieldDecl *Field) { 2277 // For anonymous unions, use the class declaration as the key. 2278 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2279 if (RT->getDecl()->isAnonymousStructOrUnion()) 2280 return static_cast<void *>(RT->getDecl()); 2281 } 2282 return static_cast<void *>(Field); 2283} 2284 2285static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2286 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2287} 2288 2289static void *GetKeyForMember(ASTContext &Context, 2290 CXXCtorInitializer *Member) { 2291 if (!Member->isAnyMemberInitializer()) 2292 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2293 2294 // For fields injected into the class via declaration of an anonymous union, 2295 // use its anonymous union class declaration as the unique key. 2296 FieldDecl *Field = Member->getAnyMember(); 2297 2298 // If the field is a member of an anonymous struct or union, our key 2299 // is the anonymous record decl that's a direct child of the class. 2300 RecordDecl *RD = Field->getParent(); 2301 if (RD->isAnonymousStructOrUnion()) { 2302 while (true) { 2303 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2304 if (Parent->isAnonymousStructOrUnion()) 2305 RD = Parent; 2306 else 2307 break; 2308 } 2309 2310 return static_cast<void *>(RD); 2311 } 2312 2313 return static_cast<void *>(Field); 2314} 2315 2316static void 2317DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2318 const CXXConstructorDecl *Constructor, 2319 CXXCtorInitializer **Inits, 2320 unsigned NumInits) { 2321 if (Constructor->getDeclContext()->isDependentContext()) 2322 return; 2323 2324 // Don't check initializers order unless the warning is enabled at the 2325 // location of at least one initializer. 2326 bool ShouldCheckOrder = false; 2327 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2328 CXXCtorInitializer *Init = Inits[InitIndex]; 2329 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2330 Init->getSourceLocation()) 2331 != Diagnostic::Ignored) { 2332 ShouldCheckOrder = true; 2333 break; 2334 } 2335 } 2336 if (!ShouldCheckOrder) 2337 return; 2338 2339 // Build the list of bases and members in the order that they'll 2340 // actually be initialized. The explicit initializers should be in 2341 // this same order but may be missing things. 2342 llvm::SmallVector<const void*, 32> IdealInitKeys; 2343 2344 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2345 2346 // 1. Virtual bases. 2347 for (CXXRecordDecl::base_class_const_iterator VBase = 2348 ClassDecl->vbases_begin(), 2349 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2350 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2351 2352 // 2. Non-virtual bases. 2353 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2354 E = ClassDecl->bases_end(); Base != E; ++Base) { 2355 if (Base->isVirtual()) 2356 continue; 2357 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2358 } 2359 2360 // 3. Direct fields. 2361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2362 E = ClassDecl->field_end(); Field != E; ++Field) 2363 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2364 2365 unsigned NumIdealInits = IdealInitKeys.size(); 2366 unsigned IdealIndex = 0; 2367 2368 CXXCtorInitializer *PrevInit = 0; 2369 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2370 CXXCtorInitializer *Init = Inits[InitIndex]; 2371 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2372 2373 // Scan forward to try to find this initializer in the idealized 2374 // initializers list. 2375 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2376 if (InitKey == IdealInitKeys[IdealIndex]) 2377 break; 2378 2379 // If we didn't find this initializer, it must be because we 2380 // scanned past it on a previous iteration. That can only 2381 // happen if we're out of order; emit a warning. 2382 if (IdealIndex == NumIdealInits && PrevInit) { 2383 Sema::SemaDiagnosticBuilder D = 2384 SemaRef.Diag(PrevInit->getSourceLocation(), 2385 diag::warn_initializer_out_of_order); 2386 2387 if (PrevInit->isAnyMemberInitializer()) 2388 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2389 else 2390 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2391 2392 if (Init->isAnyMemberInitializer()) 2393 D << 0 << Init->getAnyMember()->getDeclName(); 2394 else 2395 D << 1 << Init->getBaseClassInfo()->getType(); 2396 2397 // Move back to the initializer's location in the ideal list. 2398 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2399 if (InitKey == IdealInitKeys[IdealIndex]) 2400 break; 2401 2402 assert(IdealIndex != NumIdealInits && 2403 "initializer not found in initializer list"); 2404 } 2405 2406 PrevInit = Init; 2407 } 2408} 2409 2410namespace { 2411bool CheckRedundantInit(Sema &S, 2412 CXXCtorInitializer *Init, 2413 CXXCtorInitializer *&PrevInit) { 2414 if (!PrevInit) { 2415 PrevInit = Init; 2416 return false; 2417 } 2418 2419 if (FieldDecl *Field = Init->getMember()) 2420 S.Diag(Init->getSourceLocation(), 2421 diag::err_multiple_mem_initialization) 2422 << Field->getDeclName() 2423 << Init->getSourceRange(); 2424 else { 2425 const Type *BaseClass = Init->getBaseClass(); 2426 assert(BaseClass && "neither field nor base"); 2427 S.Diag(Init->getSourceLocation(), 2428 diag::err_multiple_base_initialization) 2429 << QualType(BaseClass, 0) 2430 << Init->getSourceRange(); 2431 } 2432 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2433 << 0 << PrevInit->getSourceRange(); 2434 2435 return true; 2436} 2437 2438typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2439typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2440 2441bool CheckRedundantUnionInit(Sema &S, 2442 CXXCtorInitializer *Init, 2443 RedundantUnionMap &Unions) { 2444 FieldDecl *Field = Init->getAnyMember(); 2445 RecordDecl *Parent = Field->getParent(); 2446 if (!Parent->isAnonymousStructOrUnion()) 2447 return false; 2448 2449 NamedDecl *Child = Field; 2450 do { 2451 if (Parent->isUnion()) { 2452 UnionEntry &En = Unions[Parent]; 2453 if (En.first && En.first != Child) { 2454 S.Diag(Init->getSourceLocation(), 2455 diag::err_multiple_mem_union_initialization) 2456 << Field->getDeclName() 2457 << Init->getSourceRange(); 2458 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2459 << 0 << En.second->getSourceRange(); 2460 return true; 2461 } else if (!En.first) { 2462 En.first = Child; 2463 En.second = Init; 2464 } 2465 } 2466 2467 Child = Parent; 2468 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2469 } while (Parent->isAnonymousStructOrUnion()); 2470 2471 return false; 2472} 2473} 2474 2475/// ActOnMemInitializers - Handle the member initializers for a constructor. 2476void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2477 SourceLocation ColonLoc, 2478 MemInitTy **meminits, unsigned NumMemInits, 2479 bool AnyErrors) { 2480 if (!ConstructorDecl) 2481 return; 2482 2483 AdjustDeclIfTemplate(ConstructorDecl); 2484 2485 CXXConstructorDecl *Constructor 2486 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2487 2488 if (!Constructor) { 2489 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2490 return; 2491 } 2492 2493 CXXCtorInitializer **MemInits = 2494 reinterpret_cast<CXXCtorInitializer **>(meminits); 2495 2496 // Mapping for the duplicate initializers check. 2497 // For member initializers, this is keyed with a FieldDecl*. 2498 // For base initializers, this is keyed with a Type*. 2499 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2500 2501 // Mapping for the inconsistent anonymous-union initializers check. 2502 RedundantUnionMap MemberUnions; 2503 2504 bool HadError = false; 2505 for (unsigned i = 0; i < NumMemInits; i++) { 2506 CXXCtorInitializer *Init = MemInits[i]; 2507 2508 // Set the source order index. 2509 Init->setSourceOrder(i); 2510 2511 if (Init->isAnyMemberInitializer()) { 2512 FieldDecl *Field = Init->getAnyMember(); 2513 if (CheckRedundantInit(*this, Init, Members[Field]) || 2514 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2515 HadError = true; 2516 } else if (Init->isBaseInitializer()) { 2517 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2518 if (CheckRedundantInit(*this, Init, Members[Key])) 2519 HadError = true; 2520 } else { 2521 assert(Init->isDelegatingInitializer()); 2522 // This must be the only initializer 2523 if (i != 0 || NumMemInits > 1) { 2524 Diag(MemInits[0]->getSourceLocation(), 2525 diag::err_delegating_initializer_alone) 2526 << MemInits[0]->getSourceRange(); 2527 HadError = true; 2528 // We will treat this as being the only initializer. 2529 } 2530 SetDelegatingInitializer(Constructor, MemInits[i]); 2531 // Return immediately as the initializer is set. 2532 return; 2533 } 2534 } 2535 2536 if (HadError) 2537 return; 2538 2539 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2540 2541 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2542} 2543 2544void 2545Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2546 CXXRecordDecl *ClassDecl) { 2547 // Ignore dependent contexts. 2548 if (ClassDecl->isDependentContext()) 2549 return; 2550 2551 // FIXME: all the access-control diagnostics are positioned on the 2552 // field/base declaration. That's probably good; that said, the 2553 // user might reasonably want to know why the destructor is being 2554 // emitted, and we currently don't say. 2555 2556 // Non-static data members. 2557 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2558 E = ClassDecl->field_end(); I != E; ++I) { 2559 FieldDecl *Field = *I; 2560 if (Field->isInvalidDecl()) 2561 continue; 2562 QualType FieldType = Context.getBaseElementType(Field->getType()); 2563 2564 const RecordType* RT = FieldType->getAs<RecordType>(); 2565 if (!RT) 2566 continue; 2567 2568 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2569 if (FieldClassDecl->isInvalidDecl()) 2570 continue; 2571 if (FieldClassDecl->hasTrivialDestructor()) 2572 continue; 2573 2574 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2575 assert(Dtor && "No dtor found for FieldClassDecl!"); 2576 CheckDestructorAccess(Field->getLocation(), Dtor, 2577 PDiag(diag::err_access_dtor_field) 2578 << Field->getDeclName() 2579 << FieldType); 2580 2581 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2582 } 2583 2584 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2585 2586 // Bases. 2587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2588 E = ClassDecl->bases_end(); Base != E; ++Base) { 2589 // Bases are always records in a well-formed non-dependent class. 2590 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2591 2592 // Remember direct virtual bases. 2593 if (Base->isVirtual()) 2594 DirectVirtualBases.insert(RT); 2595 2596 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2597 // If our base class is invalid, we probably can't get its dtor anyway. 2598 if (BaseClassDecl->isInvalidDecl()) 2599 continue; 2600 // Ignore trivial destructors. 2601 if (BaseClassDecl->hasTrivialDestructor()) 2602 continue; 2603 2604 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2605 assert(Dtor && "No dtor found for BaseClassDecl!"); 2606 2607 // FIXME: caret should be on the start of the class name 2608 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2609 PDiag(diag::err_access_dtor_base) 2610 << Base->getType() 2611 << Base->getSourceRange()); 2612 2613 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2614 } 2615 2616 // Virtual bases. 2617 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2618 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2619 2620 // Bases are always records in a well-formed non-dependent class. 2621 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2622 2623 // Ignore direct virtual bases. 2624 if (DirectVirtualBases.count(RT)) 2625 continue; 2626 2627 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2628 // If our base class is invalid, we probably can't get its dtor anyway. 2629 if (BaseClassDecl->isInvalidDecl()) 2630 continue; 2631 // Ignore trivial destructors. 2632 if (BaseClassDecl->hasTrivialDestructor()) 2633 continue; 2634 2635 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2636 assert(Dtor && "No dtor found for BaseClassDecl!"); 2637 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2638 PDiag(diag::err_access_dtor_vbase) 2639 << VBase->getType()); 2640 2641 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2642 } 2643} 2644 2645void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2646 if (!CDtorDecl) 2647 return; 2648 2649 if (CXXConstructorDecl *Constructor 2650 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2651 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2652} 2653 2654bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2655 unsigned DiagID, AbstractDiagSelID SelID) { 2656 if (SelID == -1) 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2658 else 2659 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2660} 2661 2662bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2663 const PartialDiagnostic &PD) { 2664 if (!getLangOptions().CPlusPlus) 2665 return false; 2666 2667 if (const ArrayType *AT = Context.getAsArrayType(T)) 2668 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2669 2670 if (const PointerType *PT = T->getAs<PointerType>()) { 2671 // Find the innermost pointer type. 2672 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2673 PT = T; 2674 2675 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2676 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2677 } 2678 2679 const RecordType *RT = T->getAs<RecordType>(); 2680 if (!RT) 2681 return false; 2682 2683 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2684 2685 // We can't answer whether something is abstract until it has a 2686 // definition. If it's currently being defined, we'll walk back 2687 // over all the declarations when we have a full definition. 2688 const CXXRecordDecl *Def = RD->getDefinition(); 2689 if (!Def || Def->isBeingDefined()) 2690 return false; 2691 2692 if (!RD->isAbstract()) 2693 return false; 2694 2695 Diag(Loc, PD) << RD->getDeclName(); 2696 DiagnoseAbstractType(RD); 2697 2698 return true; 2699} 2700 2701void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2702 // Check if we've already emitted the list of pure virtual functions 2703 // for this class. 2704 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2705 return; 2706 2707 CXXFinalOverriderMap FinalOverriders; 2708 RD->getFinalOverriders(FinalOverriders); 2709 2710 // Keep a set of seen pure methods so we won't diagnose the same method 2711 // more than once. 2712 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2713 2714 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2715 MEnd = FinalOverriders.end(); 2716 M != MEnd; 2717 ++M) { 2718 for (OverridingMethods::iterator SO = M->second.begin(), 2719 SOEnd = M->second.end(); 2720 SO != SOEnd; ++SO) { 2721 // C++ [class.abstract]p4: 2722 // A class is abstract if it contains or inherits at least one 2723 // pure virtual function for which the final overrider is pure 2724 // virtual. 2725 2726 // 2727 if (SO->second.size() != 1) 2728 continue; 2729 2730 if (!SO->second.front().Method->isPure()) 2731 continue; 2732 2733 if (!SeenPureMethods.insert(SO->second.front().Method)) 2734 continue; 2735 2736 Diag(SO->second.front().Method->getLocation(), 2737 diag::note_pure_virtual_function) 2738 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2739 } 2740 } 2741 2742 if (!PureVirtualClassDiagSet) 2743 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2744 PureVirtualClassDiagSet->insert(RD); 2745} 2746 2747namespace { 2748struct AbstractUsageInfo { 2749 Sema &S; 2750 CXXRecordDecl *Record; 2751 CanQualType AbstractType; 2752 bool Invalid; 2753 2754 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2755 : S(S), Record(Record), 2756 AbstractType(S.Context.getCanonicalType( 2757 S.Context.getTypeDeclType(Record))), 2758 Invalid(false) {} 2759 2760 void DiagnoseAbstractType() { 2761 if (Invalid) return; 2762 S.DiagnoseAbstractType(Record); 2763 Invalid = true; 2764 } 2765 2766 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2767}; 2768 2769struct CheckAbstractUsage { 2770 AbstractUsageInfo &Info; 2771 const NamedDecl *Ctx; 2772 2773 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2774 : Info(Info), Ctx(Ctx) {} 2775 2776 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2777 switch (TL.getTypeLocClass()) { 2778#define ABSTRACT_TYPELOC(CLASS, PARENT) 2779#define TYPELOC(CLASS, PARENT) \ 2780 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2781#include "clang/AST/TypeLocNodes.def" 2782 } 2783 } 2784 2785 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2786 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2787 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2788 if (!TL.getArg(I)) 2789 continue; 2790 2791 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2792 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2793 } 2794 } 2795 2796 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2797 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2798 } 2799 2800 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2801 // Visit the type parameters from a permissive context. 2802 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2803 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2804 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2805 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2806 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2807 // TODO: other template argument types? 2808 } 2809 } 2810 2811 // Visit pointee types from a permissive context. 2812#define CheckPolymorphic(Type) \ 2813 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2814 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2815 } 2816 CheckPolymorphic(PointerTypeLoc) 2817 CheckPolymorphic(ReferenceTypeLoc) 2818 CheckPolymorphic(MemberPointerTypeLoc) 2819 CheckPolymorphic(BlockPointerTypeLoc) 2820 2821 /// Handle all the types we haven't given a more specific 2822 /// implementation for above. 2823 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2824 // Every other kind of type that we haven't called out already 2825 // that has an inner type is either (1) sugar or (2) contains that 2826 // inner type in some way as a subobject. 2827 if (TypeLoc Next = TL.getNextTypeLoc()) 2828 return Visit(Next, Sel); 2829 2830 // If there's no inner type and we're in a permissive context, 2831 // don't diagnose. 2832 if (Sel == Sema::AbstractNone) return; 2833 2834 // Check whether the type matches the abstract type. 2835 QualType T = TL.getType(); 2836 if (T->isArrayType()) { 2837 Sel = Sema::AbstractArrayType; 2838 T = Info.S.Context.getBaseElementType(T); 2839 } 2840 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2841 if (CT != Info.AbstractType) return; 2842 2843 // It matched; do some magic. 2844 if (Sel == Sema::AbstractArrayType) { 2845 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2846 << T << TL.getSourceRange(); 2847 } else { 2848 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2849 << Sel << T << TL.getSourceRange(); 2850 } 2851 Info.DiagnoseAbstractType(); 2852 } 2853}; 2854 2855void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2856 Sema::AbstractDiagSelID Sel) { 2857 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2858} 2859 2860} 2861 2862/// Check for invalid uses of an abstract type in a method declaration. 2863static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2864 CXXMethodDecl *MD) { 2865 // No need to do the check on definitions, which require that 2866 // the return/param types be complete. 2867 if (MD->doesThisDeclarationHaveABody()) 2868 return; 2869 2870 // For safety's sake, just ignore it if we don't have type source 2871 // information. This should never happen for non-implicit methods, 2872 // but... 2873 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2874 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2875} 2876 2877/// Check for invalid uses of an abstract type within a class definition. 2878static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2879 CXXRecordDecl *RD) { 2880 for (CXXRecordDecl::decl_iterator 2881 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2882 Decl *D = *I; 2883 if (D->isImplicit()) continue; 2884 2885 // Methods and method templates. 2886 if (isa<CXXMethodDecl>(D)) { 2887 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2888 } else if (isa<FunctionTemplateDecl>(D)) { 2889 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2890 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2891 2892 // Fields and static variables. 2893 } else if (isa<FieldDecl>(D)) { 2894 FieldDecl *FD = cast<FieldDecl>(D); 2895 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2896 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2897 } else if (isa<VarDecl>(D)) { 2898 VarDecl *VD = cast<VarDecl>(D); 2899 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2900 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2901 2902 // Nested classes and class templates. 2903 } else if (isa<CXXRecordDecl>(D)) { 2904 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2905 } else if (isa<ClassTemplateDecl>(D)) { 2906 CheckAbstractClassUsage(Info, 2907 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2908 } 2909 } 2910} 2911 2912/// \brief Perform semantic checks on a class definition that has been 2913/// completing, introducing implicitly-declared members, checking for 2914/// abstract types, etc. 2915void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2916 if (!Record) 2917 return; 2918 2919 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2920 AbstractUsageInfo Info(*this, Record); 2921 CheckAbstractClassUsage(Info, Record); 2922 } 2923 2924 // If this is not an aggregate type and has no user-declared constructor, 2925 // complain about any non-static data members of reference or const scalar 2926 // type, since they will never get initializers. 2927 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2928 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2929 bool Complained = false; 2930 for (RecordDecl::field_iterator F = Record->field_begin(), 2931 FEnd = Record->field_end(); 2932 F != FEnd; ++F) { 2933 if (F->getType()->isReferenceType() || 2934 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2935 if (!Complained) { 2936 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2937 << Record->getTagKind() << Record; 2938 Complained = true; 2939 } 2940 2941 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2942 << F->getType()->isReferenceType() 2943 << F->getDeclName(); 2944 } 2945 } 2946 } 2947 2948 if (Record->isDynamicClass() && !Record->isDependentType()) 2949 DynamicClasses.push_back(Record); 2950 2951 if (Record->getIdentifier()) { 2952 // C++ [class.mem]p13: 2953 // If T is the name of a class, then each of the following shall have a 2954 // name different from T: 2955 // - every member of every anonymous union that is a member of class T. 2956 // 2957 // C++ [class.mem]p14: 2958 // In addition, if class T has a user-declared constructor (12.1), every 2959 // non-static data member of class T shall have a name different from T. 2960 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2961 R.first != R.second; ++R.first) { 2962 NamedDecl *D = *R.first; 2963 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2964 isa<IndirectFieldDecl>(D)) { 2965 Diag(D->getLocation(), diag::err_member_name_of_class) 2966 << D->getDeclName(); 2967 break; 2968 } 2969 } 2970 } 2971 2972 // Warn if the class has virtual methods but non-virtual public destructor. 2973 if (Record->isPolymorphic() && !Record->isDependentType()) { 2974 CXXDestructorDecl *dtor = Record->getDestructor(); 2975 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2976 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2977 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2978 } 2979 2980 // See if a method overloads virtual methods in a base 2981 /// class without overriding any. 2982 if (!Record->isDependentType()) { 2983 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2984 MEnd = Record->method_end(); 2985 M != MEnd; ++M) { 2986 if (!(*M)->isStatic()) 2987 DiagnoseHiddenVirtualMethods(Record, *M); 2988 } 2989 } 2990 2991 // Declare inherited constructors. We do this eagerly here because: 2992 // - The standard requires an eager diagnostic for conflicting inherited 2993 // constructors from different classes. 2994 // - The lazy declaration of the other implicit constructors is so as to not 2995 // waste space and performance on classes that are not meant to be 2996 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2997 // have inherited constructors. 2998 DeclareInheritedConstructors(Record); 2999 3000 CheckExplicitlyDefaultedMethods(Record); 3001} 3002 3003void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3004 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3005 ME = Record->method_end(); 3006 MI != ME; ++MI) { 3007 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3008 switch (getSpecialMember(*MI)) { 3009 case CXXDefaultConstructor: 3010 CheckExplicitlyDefaultedDefaultConstructor( 3011 cast<CXXConstructorDecl>(*MI)); 3012 break; 3013 3014 case CXXDestructor: 3015 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3016 break; 3017 3018 case CXXCopyConstructor: 3019 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3020 break; 3021 3022 case CXXCopyAssignment: 3023 CheckExplicitlyDefaultedCopyAssignment(*MI); 3024 break; 3025 3026 default: 3027 // FIXME: Do moves once they exist 3028 llvm_unreachable("non-special member explicitly defaulted!"); 3029 } 3030 } 3031 } 3032 3033} 3034 3035void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3036 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3037 3038 // Whether this was the first-declared instance of the constructor. 3039 // This affects whether we implicitly add an exception spec (and, eventually, 3040 // constexpr). It is also ill-formed to explicitly default a constructor such 3041 // that it would be deleted. (C++0x [decl.fct.def.default]) 3042 bool First = CD == CD->getCanonicalDecl(); 3043 3044 bool HadError = false; 3045 if (CD->getNumParams() != 0) { 3046 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3047 << CD->getSourceRange(); 3048 HadError = true; 3049 } 3050 3051 ImplicitExceptionSpecification Spec 3052 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3053 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3054 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3055 *ExceptionType = Context.getFunctionType( 3056 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3057 3058 if (CtorType->hasExceptionSpec()) { 3059 if (CheckEquivalentExceptionSpec( 3060 PDiag(diag::err_incorrect_defaulted_exception_spec) 3061 << 0 /* default constructor */, 3062 PDiag(), 3063 ExceptionType, SourceLocation(), 3064 CtorType, CD->getLocation())) { 3065 HadError = true; 3066 } 3067 } else if (First) { 3068 // We set the declaration to have the computed exception spec here. 3069 // We know there are no parameters. 3070 EPI.ExtInfo = CtorType->getExtInfo(); 3071 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3072 } 3073 3074 if (HadError) { 3075 CD->setInvalidDecl(); 3076 return; 3077 } 3078 3079 if (ShouldDeleteDefaultConstructor(CD)) { 3080 if (First) { 3081 CD->setDeletedAsWritten(); 3082 } else { 3083 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3084 << 0 /* default constructor */; 3085 CD->setInvalidDecl(); 3086 } 3087 } 3088} 3089 3090void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3091 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3092 3093 // Whether this was the first-declared instance of the constructor. 3094 bool First = CD == CD->getCanonicalDecl(); 3095 3096 bool HadError = false; 3097 if (CD->getNumParams() != 1) { 3098 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3099 << CD->getSourceRange(); 3100 HadError = true; 3101 } 3102 3103 ImplicitExceptionSpecification Spec(Context); 3104 bool Const; 3105 llvm::tie(Spec, Const) = 3106 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3107 3108 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3109 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3110 *ExceptionType = Context.getFunctionType( 3111 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3112 3113 // Check for parameter type matching. 3114 // This is a copy ctor so we know it's a cv-qualified reference to T. 3115 QualType ArgType = CtorType->getArgType(0); 3116 if (ArgType->getPointeeType().isVolatileQualified()) { 3117 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3118 HadError = true; 3119 } 3120 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3121 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3122 HadError = true; 3123 } 3124 3125 if (CtorType->hasExceptionSpec()) { 3126 if (CheckEquivalentExceptionSpec( 3127 PDiag(diag::err_incorrect_defaulted_exception_spec) 3128 << 1 /* copy constructor */, 3129 PDiag(), 3130 ExceptionType, SourceLocation(), 3131 CtorType, CD->getLocation())) { 3132 HadError = true; 3133 } 3134 } else if (First) { 3135 // We set the declaration to have the computed exception spec here. 3136 // We duplicate the one parameter type. 3137 EPI.ExtInfo = CtorType->getExtInfo(); 3138 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3139 } 3140 3141 if (HadError) { 3142 CD->setInvalidDecl(); 3143 return; 3144 } 3145 3146 if (ShouldDeleteCopyConstructor(CD)) { 3147 if (First) { 3148 CD->setDeletedAsWritten(); 3149 } else { 3150 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3151 << 1 /* copy constructor */; 3152 CD->setInvalidDecl(); 3153 } 3154 } 3155} 3156 3157void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3158 assert(MD->isExplicitlyDefaulted()); 3159 3160 // Whether this was the first-declared instance of the operator 3161 bool First = MD == MD->getCanonicalDecl(); 3162 3163 bool HadError = false; 3164 if (MD->getNumParams() != 1) { 3165 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3166 << MD->getSourceRange(); 3167 HadError = true; 3168 } 3169 3170 QualType ReturnType = 3171 MD->getType()->getAs<FunctionType>()->getResultType(); 3172 if (!ReturnType->isLValueReferenceType() || 3173 !Context.hasSameType( 3174 Context.getCanonicalType(ReturnType->getPointeeType()), 3175 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3176 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3177 HadError = true; 3178 } 3179 3180 ImplicitExceptionSpecification Spec(Context); 3181 bool Const; 3182 llvm::tie(Spec, Const) = 3183 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3184 3185 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3186 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3187 *ExceptionType = Context.getFunctionType( 3188 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3189 3190 QualType ArgType = OperType->getArgType(0); 3191 if (!ArgType->isReferenceType()) { 3192 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3193 HadError = true; 3194 } else { 3195 if (ArgType->getPointeeType().isVolatileQualified()) { 3196 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3197 HadError = true; 3198 } 3199 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3200 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3201 HadError = true; 3202 } 3203 } 3204 3205 if (OperType->getTypeQuals()) { 3206 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3207 HadError = true; 3208 } 3209 3210 if (OperType->hasExceptionSpec()) { 3211 if (CheckEquivalentExceptionSpec( 3212 PDiag(diag::err_incorrect_defaulted_exception_spec) 3213 << 2 /* copy assignment operator */, 3214 PDiag(), 3215 ExceptionType, SourceLocation(), 3216 OperType, MD->getLocation())) { 3217 HadError = true; 3218 } 3219 } else if (First) { 3220 // We set the declaration to have the computed exception spec here. 3221 // We duplicate the one parameter type. 3222 EPI.RefQualifier = OperType->getRefQualifier(); 3223 EPI.ExtInfo = OperType->getExtInfo(); 3224 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3225 } 3226 3227 if (HadError) { 3228 MD->setInvalidDecl(); 3229 return; 3230 } 3231 3232 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3233 if (First) { 3234 MD->setDeletedAsWritten(); 3235 } else { 3236 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3237 << 2 /* copy assignment operator */; 3238 MD->setInvalidDecl(); 3239 } 3240 } 3241} 3242 3243void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3244 assert(DD->isExplicitlyDefaulted()); 3245 3246 // Whether this was the first-declared instance of the destructor. 3247 bool First = DD == DD->getCanonicalDecl(); 3248 3249 ImplicitExceptionSpecification Spec 3250 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3251 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3252 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3253 *ExceptionType = Context.getFunctionType( 3254 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3255 3256 if (DtorType->hasExceptionSpec()) { 3257 if (CheckEquivalentExceptionSpec( 3258 PDiag(diag::err_incorrect_defaulted_exception_spec) 3259 << 3 /* destructor */, 3260 PDiag(), 3261 ExceptionType, SourceLocation(), 3262 DtorType, DD->getLocation())) { 3263 DD->setInvalidDecl(); 3264 return; 3265 } 3266 } else if (First) { 3267 // We set the declaration to have the computed exception spec here. 3268 // There are no parameters. 3269 EPI.ExtInfo = DtorType->getExtInfo(); 3270 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3271 } 3272 3273 if (ShouldDeleteDestructor(DD)) { 3274 if (First) { 3275 DD->setDeletedAsWritten(); 3276 } else { 3277 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3278 << 3 /* destructor */; 3279 DD->setInvalidDecl(); 3280 } 3281 } 3282} 3283 3284bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3285 CXXRecordDecl *RD = CD->getParent(); 3286 assert(!RD->isDependentType() && "do deletion after instantiation"); 3287 if (!LangOpts.CPlusPlus0x) 3288 return false; 3289 3290 SourceLocation Loc = CD->getLocation(); 3291 3292 // Do access control from the constructor 3293 ContextRAII CtorContext(*this, CD); 3294 3295 bool Union = RD->isUnion(); 3296 bool AllConst = true; 3297 3298 // We do this because we should never actually use an anonymous 3299 // union's constructor. 3300 if (Union && RD->isAnonymousStructOrUnion()) 3301 return false; 3302 3303 // FIXME: We should put some diagnostic logic right into this function. 3304 3305 // C++0x [class.ctor]/5 3306 // A defaulted default constructor for class X is defined as delete if: 3307 3308 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3309 BE = RD->bases_end(); 3310 BI != BE; ++BI) { 3311 // We'll handle this one later 3312 if (BI->isVirtual()) 3313 continue; 3314 3315 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3316 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3317 3318 // -- any [direct base class] has a type with a destructor that is 3319 // delete or inaccessible from the defaulted default constructor 3320 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3321 if (BaseDtor->isDeleted()) 3322 return true; 3323 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3324 AR_accessible) 3325 return true; 3326 3327 // -- any [direct base class either] has no default constructor or 3328 // overload resolution as applied to [its] default constructor 3329 // results in an ambiguity or in a function that is deleted or 3330 // inaccessible from the defaulted default constructor 3331 InitializedEntity BaseEntity = 3332 InitializedEntity::InitializeBase(Context, BI, 0); 3333 InitializationKind Kind = 3334 InitializationKind::CreateDirect(Loc, Loc, Loc); 3335 3336 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3337 3338 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3339 return true; 3340 } 3341 3342 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3343 BE = RD->vbases_end(); 3344 BI != BE; ++BI) { 3345 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3346 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3347 3348 // -- any [virtual base class] has a type with a destructor that is 3349 // delete or inaccessible from the defaulted default constructor 3350 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3351 if (BaseDtor->isDeleted()) 3352 return true; 3353 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3354 AR_accessible) 3355 return true; 3356 3357 // -- any [virtual base class either] has no default constructor or 3358 // overload resolution as applied to [its] default constructor 3359 // results in an ambiguity or in a function that is deleted or 3360 // inaccessible from the defaulted default constructor 3361 InitializedEntity BaseEntity = 3362 InitializedEntity::InitializeBase(Context, BI, BI); 3363 InitializationKind Kind = 3364 InitializationKind::CreateDirect(Loc, Loc, Loc); 3365 3366 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3367 3368 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3369 return true; 3370 } 3371 3372 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3373 FE = RD->field_end(); 3374 FI != FE; ++FI) { 3375 QualType FieldType = Context.getBaseElementType(FI->getType()); 3376 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3377 3378 // -- any non-static data member with no brace-or-equal-initializer is of 3379 // reference type 3380 if (FieldType->isReferenceType()) 3381 return true; 3382 3383 // -- X is a union and all its variant members are of const-qualified type 3384 // (or array thereof) 3385 if (Union && !FieldType.isConstQualified()) 3386 AllConst = false; 3387 3388 if (FieldRecord) { 3389 // -- X is a union-like class that has a variant member with a non-trivial 3390 // default constructor 3391 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3392 return true; 3393 3394 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3395 if (FieldDtor->isDeleted()) 3396 return true; 3397 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3398 AR_accessible) 3399 return true; 3400 3401 // -- any non-variant non-static data member of const-qualified type (or 3402 // array thereof) with no brace-or-equal-initializer does not have a 3403 // user-provided default constructor 3404 if (FieldType.isConstQualified() && 3405 !FieldRecord->hasUserProvidedDefaultConstructor()) 3406 return true; 3407 3408 if (!Union && FieldRecord->isUnion() && 3409 FieldRecord->isAnonymousStructOrUnion()) { 3410 // We're okay to reuse AllConst here since we only care about the 3411 // value otherwise if we're in a union. 3412 AllConst = true; 3413 3414 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3415 UE = FieldRecord->field_end(); 3416 UI != UE; ++UI) { 3417 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3418 CXXRecordDecl *UnionFieldRecord = 3419 UnionFieldType->getAsCXXRecordDecl(); 3420 3421 if (!UnionFieldType.isConstQualified()) 3422 AllConst = false; 3423 3424 if (UnionFieldRecord && 3425 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3426 return true; 3427 } 3428 3429 if (AllConst) 3430 return true; 3431 3432 // Don't try to initialize the anonymous union 3433 // This is technically non-conformant, but sanity demands it. 3434 continue; 3435 } 3436 } else if (!Union && FieldType.isConstQualified()) { 3437 // -- any non-variant non-static data member of const-qualified type (or 3438 // array thereof) with no brace-or-equal-initializer does not have a 3439 // user-provided default constructor 3440 return true; 3441 } 3442 3443 InitializedEntity MemberEntity = 3444 InitializedEntity::InitializeMember(*FI, 0); 3445 InitializationKind Kind = 3446 InitializationKind::CreateDirect(Loc, Loc, Loc); 3447 3448 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3449 3450 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3451 return true; 3452 } 3453 3454 if (Union && AllConst) 3455 return true; 3456 3457 return false; 3458} 3459 3460bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3461 CXXRecordDecl *RD = CD->getParent(); 3462 assert(!RD->isDependentType() && "do deletion after instantiation"); 3463 if (!LangOpts.CPlusPlus0x) 3464 return false; 3465 3466 SourceLocation Loc = CD->getLocation(); 3467 3468 // Do access control from the constructor 3469 ContextRAII CtorContext(*this, CD); 3470 3471 bool Union = RD->isUnion(); 3472 3473 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3474 "copy assignment arg has no pointee type"); 3475 bool ConstArg = 3476 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3477 3478 // We do this because we should never actually use an anonymous 3479 // union's constructor. 3480 if (Union && RD->isAnonymousStructOrUnion()) 3481 return false; 3482 3483 // FIXME: We should put some diagnostic logic right into this function. 3484 3485 // C++0x [class.copy]/11 3486 // A defaulted [copy] constructor for class X is defined as delete if X has: 3487 3488 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3489 BE = RD->bases_end(); 3490 BI != BE; ++BI) { 3491 // We'll handle this one later 3492 if (BI->isVirtual()) 3493 continue; 3494 3495 QualType BaseType = BI->getType(); 3496 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3497 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3498 3499 // -- any [direct base class] of a type with a destructor that is deleted or 3500 // inaccessible from the defaulted constructor 3501 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3502 if (BaseDtor->isDeleted()) 3503 return true; 3504 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3505 AR_accessible) 3506 return true; 3507 3508 // -- a [direct base class] B that cannot be [copied] because overload 3509 // resolution, as applied to B's [copy] constructor, results in an 3510 // ambiguity or a function that is deleted or inaccessible from the 3511 // defaulted constructor 3512 InitializedEntity BaseEntity = 3513 InitializedEntity::InitializeBase(Context, BI, 0); 3514 InitializationKind Kind = 3515 InitializationKind::CreateDirect(Loc, Loc, Loc); 3516 3517 // Construct a fake expression to perform the copy overloading. 3518 QualType ArgType = BaseType.getUnqualifiedType(); 3519 if (ConstArg) 3520 ArgType.addConst(); 3521 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3522 3523 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3524 3525 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3526 return true; 3527 } 3528 3529 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3530 BE = RD->vbases_end(); 3531 BI != BE; ++BI) { 3532 QualType BaseType = BI->getType(); 3533 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3534 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3535 3536 // -- any [direct base class] of a type with a destructor that is deleted or 3537 // inaccessible from the defaulted constructor 3538 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3539 if (BaseDtor->isDeleted()) 3540 return true; 3541 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3542 AR_accessible) 3543 return true; 3544 3545 // -- a [virtual base class] B that cannot be [copied] because overload 3546 // resolution, as applied to B's [copy] constructor, results in an 3547 // ambiguity or a function that is deleted or inaccessible from the 3548 // defaulted constructor 3549 InitializedEntity BaseEntity = 3550 InitializedEntity::InitializeBase(Context, BI, BI); 3551 InitializationKind Kind = 3552 InitializationKind::CreateDirect(Loc, Loc, Loc); 3553 3554 // Construct a fake expression to perform the copy overloading. 3555 QualType ArgType = BaseType.getUnqualifiedType(); 3556 if (ConstArg) 3557 ArgType.addConst(); 3558 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3559 3560 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3561 3562 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3563 return true; 3564 } 3565 3566 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3567 FE = RD->field_end(); 3568 FI != FE; ++FI) { 3569 QualType FieldType = Context.getBaseElementType(FI->getType()); 3570 3571 // -- for a copy constructor, a non-static data member of rvalue reference 3572 // type 3573 if (FieldType->isRValueReferenceType()) 3574 return true; 3575 3576 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3577 3578 if (FieldRecord) { 3579 // This is an anonymous union 3580 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3581 // Anonymous unions inside unions do not variant members create 3582 if (!Union) { 3583 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3584 UE = FieldRecord->field_end(); 3585 UI != UE; ++UI) { 3586 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3587 CXXRecordDecl *UnionFieldRecord = 3588 UnionFieldType->getAsCXXRecordDecl(); 3589 3590 // -- a variant member with a non-trivial [copy] constructor and X 3591 // is a union-like class 3592 if (UnionFieldRecord && 3593 !UnionFieldRecord->hasTrivialCopyConstructor()) 3594 return true; 3595 } 3596 } 3597 3598 // Don't try to initalize an anonymous union 3599 continue; 3600 } else { 3601 // -- a variant member with a non-trivial [copy] constructor and X is a 3602 // union-like class 3603 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3604 return true; 3605 3606 // -- any [non-static data member] of a type with a destructor that is 3607 // deleted or inaccessible from the defaulted constructor 3608 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3609 if (FieldDtor->isDeleted()) 3610 return true; 3611 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3612 AR_accessible) 3613 return true; 3614 } 3615 } 3616 3617 llvm::SmallVector<InitializedEntity, 4> Entities; 3618 QualType CurType = FI->getType(); 3619 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3620 while (CurType->isArrayType()) { 3621 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3622 Entities.back())); 3623 CurType = Context.getAsArrayType(CurType)->getElementType(); 3624 } 3625 3626 InitializationKind Kind = 3627 InitializationKind::CreateDirect(Loc, Loc, Loc); 3628 3629 // Construct a fake expression to perform the copy overloading. 3630 QualType ArgType = FieldType; 3631 if (ArgType->isReferenceType()) 3632 ArgType = ArgType->getPointeeType(); 3633 else if (ConstArg) 3634 ArgType.addConst(); 3635 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3636 3637 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3638 3639 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3640 return true; 3641 } 3642 3643 return false; 3644} 3645 3646bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3647 CXXRecordDecl *RD = MD->getParent(); 3648 assert(!RD->isDependentType() && "do deletion after instantiation"); 3649 if (!LangOpts.CPlusPlus0x) 3650 return false; 3651 3652 SourceLocation Loc = MD->getLocation(); 3653 3654 // Do access control from the constructor 3655 ContextRAII MethodContext(*this, MD); 3656 3657 bool Union = RD->isUnion(); 3658 3659 bool ConstArg = 3660 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3661 3662 // We do this because we should never actually use an anonymous 3663 // union's constructor. 3664 if (Union && RD->isAnonymousStructOrUnion()) 3665 return false; 3666 3667 DeclarationName OperatorName = 3668 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3669 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3670 R.suppressDiagnostics(); 3671 3672 // FIXME: We should put some diagnostic logic right into this function. 3673 3674 // C++0x [class.copy]/11 3675 // A defaulted [copy] assignment operator for class X is defined as deleted 3676 // if X has: 3677 3678 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3679 BE = RD->bases_end(); 3680 BI != BE; ++BI) { 3681 // We'll handle this one later 3682 if (BI->isVirtual()) 3683 continue; 3684 3685 QualType BaseType = BI->getType(); 3686 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3687 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3688 3689 // -- a [direct base class] B that cannot be [copied] because overload 3690 // resolution, as applied to B's [copy] assignment operator, results in 3691 // an ambiguity or a function that is deleted or inaccessible from the 3692 // assignment operator 3693 3694 LookupQualifiedName(R, BaseDecl, false); 3695 3696 // Filter out any result that isn't a copy-assignment operator. 3697 LookupResult::Filter F = R.makeFilter(); 3698 while (F.hasNext()) { 3699 NamedDecl *D = F.next(); 3700 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3701 if (Method->isCopyAssignmentOperator()) 3702 continue; 3703 3704 F.erase(); 3705 } 3706 F.done(); 3707 3708 // Build a fake argument expression 3709 QualType ArgType = BaseType; 3710 QualType ThisType = BaseType; 3711 if (ConstArg) 3712 ArgType.addConst(); 3713 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3714 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3715 }; 3716 3717 OverloadCandidateSet OCS((Loc)); 3718 OverloadCandidateSet::iterator Best; 3719 3720 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3721 3722 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3723 OR_Success) 3724 return true; 3725 } 3726 3727 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3728 BE = RD->vbases_end(); 3729 BI != BE; ++BI) { 3730 QualType BaseType = BI->getType(); 3731 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3732 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3733 3734 // -- a [virtual base class] B that cannot be [copied] because overload 3735 // resolution, as applied to B's [copy] assignment operator, results in 3736 // an ambiguity or a function that is deleted or inaccessible from the 3737 // assignment operator 3738 3739 LookupQualifiedName(R, BaseDecl, false); 3740 3741 // Filter out any result that isn't a copy-assignment operator. 3742 LookupResult::Filter F = R.makeFilter(); 3743 while (F.hasNext()) { 3744 NamedDecl *D = F.next(); 3745 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3746 if (Method->isCopyAssignmentOperator()) 3747 continue; 3748 3749 F.erase(); 3750 } 3751 F.done(); 3752 3753 // Build a fake argument expression 3754 QualType ArgType = BaseType; 3755 QualType ThisType = BaseType; 3756 if (ConstArg) 3757 ArgType.addConst(); 3758 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3759 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3760 }; 3761 3762 OverloadCandidateSet OCS((Loc)); 3763 OverloadCandidateSet::iterator Best; 3764 3765 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3766 3767 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3768 OR_Success) 3769 return true; 3770 } 3771 3772 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3773 FE = RD->field_end(); 3774 FI != FE; ++FI) { 3775 QualType FieldType = Context.getBaseElementType(FI->getType()); 3776 3777 // -- a non-static data member of reference type 3778 if (FieldType->isReferenceType()) 3779 return true; 3780 3781 // -- a non-static data member of const non-class type (or array thereof) 3782 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3783 return true; 3784 3785 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3786 3787 if (FieldRecord) { 3788 // This is an anonymous union 3789 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3790 // Anonymous unions inside unions do not variant members create 3791 if (!Union) { 3792 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3793 UE = FieldRecord->field_end(); 3794 UI != UE; ++UI) { 3795 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3796 CXXRecordDecl *UnionFieldRecord = 3797 UnionFieldType->getAsCXXRecordDecl(); 3798 3799 // -- a variant member with a non-trivial [copy] assignment operator 3800 // and X is a union-like class 3801 if (UnionFieldRecord && 3802 !UnionFieldRecord->hasTrivialCopyAssignment()) 3803 return true; 3804 } 3805 } 3806 3807 // Don't try to initalize an anonymous union 3808 continue; 3809 // -- a variant member with a non-trivial [copy] assignment operator 3810 // and X is a union-like class 3811 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3812 return true; 3813 } 3814 3815 LookupQualifiedName(R, FieldRecord, false); 3816 3817 // Filter out any result that isn't a copy-assignment operator. 3818 LookupResult::Filter F = R.makeFilter(); 3819 while (F.hasNext()) { 3820 NamedDecl *D = F.next(); 3821 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3822 if (Method->isCopyAssignmentOperator()) 3823 continue; 3824 3825 F.erase(); 3826 } 3827 F.done(); 3828 3829 // Build a fake argument expression 3830 QualType ArgType = FieldType; 3831 QualType ThisType = FieldType; 3832 if (ConstArg) 3833 ArgType.addConst(); 3834 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3835 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3836 }; 3837 3838 OverloadCandidateSet OCS((Loc)); 3839 OverloadCandidateSet::iterator Best; 3840 3841 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3842 3843 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3844 OR_Success) 3845 return true; 3846 } 3847 } 3848 3849 return false; 3850} 3851 3852bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3853 CXXRecordDecl *RD = DD->getParent(); 3854 assert(!RD->isDependentType() && "do deletion after instantiation"); 3855 if (!LangOpts.CPlusPlus0x) 3856 return false; 3857 3858 SourceLocation Loc = DD->getLocation(); 3859 3860 // Do access control from the destructor 3861 ContextRAII CtorContext(*this, DD); 3862 3863 bool Union = RD->isUnion(); 3864 3865 // We do this because we should never actually use an anonymous 3866 // union's destructor. 3867 if (Union && RD->isAnonymousStructOrUnion()) 3868 return false; 3869 3870 // C++0x [class.dtor]p5 3871 // A defaulted destructor for a class X is defined as deleted if: 3872 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3873 BE = RD->bases_end(); 3874 BI != BE; ++BI) { 3875 // We'll handle this one later 3876 if (BI->isVirtual()) 3877 continue; 3878 3879 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3880 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3881 assert(BaseDtor && "base has no destructor"); 3882 3883 // -- any direct or virtual base class has a deleted destructor or 3884 // a destructor that is inaccessible from the defaulted destructor 3885 if (BaseDtor->isDeleted()) 3886 return true; 3887 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3888 AR_accessible) 3889 return true; 3890 } 3891 3892 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3893 BE = RD->vbases_end(); 3894 BI != BE; ++BI) { 3895 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3896 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3897 assert(BaseDtor && "base has no destructor"); 3898 3899 // -- any direct or virtual base class has a deleted destructor or 3900 // a destructor that is inaccessible from the defaulted destructor 3901 if (BaseDtor->isDeleted()) 3902 return true; 3903 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3904 AR_accessible) 3905 return true; 3906 } 3907 3908 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3909 FE = RD->field_end(); 3910 FI != FE; ++FI) { 3911 QualType FieldType = Context.getBaseElementType(FI->getType()); 3912 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3913 if (FieldRecord) { 3914 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3915 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3916 UE = FieldRecord->field_end(); 3917 UI != UE; ++UI) { 3918 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3919 CXXRecordDecl *UnionFieldRecord = 3920 UnionFieldType->getAsCXXRecordDecl(); 3921 3922 // -- X is a union-like class that has a variant member with a non- 3923 // trivial destructor. 3924 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3925 return true; 3926 } 3927 // Technically we are supposed to do this next check unconditionally. 3928 // But that makes absolutely no sense. 3929 } else { 3930 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3931 3932 // -- any of the non-static data members has class type M (or array 3933 // thereof) and M has a deleted destructor or a destructor that is 3934 // inaccessible from the defaulted destructor 3935 if (FieldDtor->isDeleted()) 3936 return true; 3937 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3938 AR_accessible) 3939 return true; 3940 3941 // -- X is a union-like class that has a variant member with a non- 3942 // trivial destructor. 3943 if (Union && !FieldDtor->isTrivial()) 3944 return true; 3945 } 3946 } 3947 } 3948 3949 if (DD->isVirtual()) { 3950 FunctionDecl *OperatorDelete = 0; 3951 DeclarationName Name = 3952 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3953 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3954 false)) 3955 return true; 3956 } 3957 3958 3959 return false; 3960} 3961 3962/// \brief Data used with FindHiddenVirtualMethod 3963namespace { 3964 struct FindHiddenVirtualMethodData { 3965 Sema *S; 3966 CXXMethodDecl *Method; 3967 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3968 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3969 }; 3970} 3971 3972/// \brief Member lookup function that determines whether a given C++ 3973/// method overloads virtual methods in a base class without overriding any, 3974/// to be used with CXXRecordDecl::lookupInBases(). 3975static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3976 CXXBasePath &Path, 3977 void *UserData) { 3978 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3979 3980 FindHiddenVirtualMethodData &Data 3981 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3982 3983 DeclarationName Name = Data.Method->getDeclName(); 3984 assert(Name.getNameKind() == DeclarationName::Identifier); 3985 3986 bool foundSameNameMethod = false; 3987 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3988 for (Path.Decls = BaseRecord->lookup(Name); 3989 Path.Decls.first != Path.Decls.second; 3990 ++Path.Decls.first) { 3991 NamedDecl *D = *Path.Decls.first; 3992 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3993 MD = MD->getCanonicalDecl(); 3994 foundSameNameMethod = true; 3995 // Interested only in hidden virtual methods. 3996 if (!MD->isVirtual()) 3997 continue; 3998 // If the method we are checking overrides a method from its base 3999 // don't warn about the other overloaded methods. 4000 if (!Data.S->IsOverload(Data.Method, MD, false)) 4001 return true; 4002 // Collect the overload only if its hidden. 4003 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4004 overloadedMethods.push_back(MD); 4005 } 4006 } 4007 4008 if (foundSameNameMethod) 4009 Data.OverloadedMethods.append(overloadedMethods.begin(), 4010 overloadedMethods.end()); 4011 return foundSameNameMethod; 4012} 4013 4014/// \brief See if a method overloads virtual methods in a base class without 4015/// overriding any. 4016void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4017 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4018 MD->getLocation()) == Diagnostic::Ignored) 4019 return; 4020 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4021 return; 4022 4023 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4024 /*bool RecordPaths=*/false, 4025 /*bool DetectVirtual=*/false); 4026 FindHiddenVirtualMethodData Data; 4027 Data.Method = MD; 4028 Data.S = this; 4029 4030 // Keep the base methods that were overriden or introduced in the subclass 4031 // by 'using' in a set. A base method not in this set is hidden. 4032 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4033 res.first != res.second; ++res.first) { 4034 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4035 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4036 E = MD->end_overridden_methods(); 4037 I != E; ++I) 4038 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4039 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4040 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4041 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4042 } 4043 4044 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4045 !Data.OverloadedMethods.empty()) { 4046 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4047 << MD << (Data.OverloadedMethods.size() > 1); 4048 4049 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4050 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4051 Diag(overloadedMD->getLocation(), 4052 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4053 } 4054 } 4055} 4056 4057void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4058 Decl *TagDecl, 4059 SourceLocation LBrac, 4060 SourceLocation RBrac, 4061 AttributeList *AttrList) { 4062 if (!TagDecl) 4063 return; 4064 4065 AdjustDeclIfTemplate(TagDecl); 4066 4067 ActOnFields(S, RLoc, TagDecl, 4068 // strict aliasing violation! 4069 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4070 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4071 4072 CheckCompletedCXXClass( 4073 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4074} 4075 4076/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4077/// special functions, such as the default constructor, copy 4078/// constructor, or destructor, to the given C++ class (C++ 4079/// [special]p1). This routine can only be executed just before the 4080/// definition of the class is complete. 4081void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4082 if (!ClassDecl->hasUserDeclaredConstructor()) 4083 ++ASTContext::NumImplicitDefaultConstructors; 4084 4085 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4086 ++ASTContext::NumImplicitCopyConstructors; 4087 4088 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4089 ++ASTContext::NumImplicitCopyAssignmentOperators; 4090 4091 // If we have a dynamic class, then the copy assignment operator may be 4092 // virtual, so we have to declare it immediately. This ensures that, e.g., 4093 // it shows up in the right place in the vtable and that we diagnose 4094 // problems with the implicit exception specification. 4095 if (ClassDecl->isDynamicClass()) 4096 DeclareImplicitCopyAssignment(ClassDecl); 4097 } 4098 4099 if (!ClassDecl->hasUserDeclaredDestructor()) { 4100 ++ASTContext::NumImplicitDestructors; 4101 4102 // If we have a dynamic class, then the destructor may be virtual, so we 4103 // have to declare the destructor immediately. This ensures that, e.g., it 4104 // shows up in the right place in the vtable and that we diagnose problems 4105 // with the implicit exception specification. 4106 if (ClassDecl->isDynamicClass()) 4107 DeclareImplicitDestructor(ClassDecl); 4108 } 4109} 4110 4111void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4112 if (!D) 4113 return; 4114 4115 int NumParamList = D->getNumTemplateParameterLists(); 4116 for (int i = 0; i < NumParamList; i++) { 4117 TemplateParameterList* Params = D->getTemplateParameterList(i); 4118 for (TemplateParameterList::iterator Param = Params->begin(), 4119 ParamEnd = Params->end(); 4120 Param != ParamEnd; ++Param) { 4121 NamedDecl *Named = cast<NamedDecl>(*Param); 4122 if (Named->getDeclName()) { 4123 S->AddDecl(Named); 4124 IdResolver.AddDecl(Named); 4125 } 4126 } 4127 } 4128} 4129 4130void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4131 if (!D) 4132 return; 4133 4134 TemplateParameterList *Params = 0; 4135 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4136 Params = Template->getTemplateParameters(); 4137 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4138 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4139 Params = PartialSpec->getTemplateParameters(); 4140 else 4141 return; 4142 4143 for (TemplateParameterList::iterator Param = Params->begin(), 4144 ParamEnd = Params->end(); 4145 Param != ParamEnd; ++Param) { 4146 NamedDecl *Named = cast<NamedDecl>(*Param); 4147 if (Named->getDeclName()) { 4148 S->AddDecl(Named); 4149 IdResolver.AddDecl(Named); 4150 } 4151 } 4152} 4153 4154void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4155 if (!RecordD) return; 4156 AdjustDeclIfTemplate(RecordD); 4157 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4158 PushDeclContext(S, Record); 4159} 4160 4161void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4162 if (!RecordD) return; 4163 PopDeclContext(); 4164} 4165 4166/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4167/// parsing a top-level (non-nested) C++ class, and we are now 4168/// parsing those parts of the given Method declaration that could 4169/// not be parsed earlier (C++ [class.mem]p2), such as default 4170/// arguments. This action should enter the scope of the given 4171/// Method declaration as if we had just parsed the qualified method 4172/// name. However, it should not bring the parameters into scope; 4173/// that will be performed by ActOnDelayedCXXMethodParameter. 4174void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4175} 4176 4177/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4178/// C++ method declaration. We're (re-)introducing the given 4179/// function parameter into scope for use in parsing later parts of 4180/// the method declaration. For example, we could see an 4181/// ActOnParamDefaultArgument event for this parameter. 4182void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4183 if (!ParamD) 4184 return; 4185 4186 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4187 4188 // If this parameter has an unparsed default argument, clear it out 4189 // to make way for the parsed default argument. 4190 if (Param->hasUnparsedDefaultArg()) 4191 Param->setDefaultArg(0); 4192 4193 S->AddDecl(Param); 4194 if (Param->getDeclName()) 4195 IdResolver.AddDecl(Param); 4196} 4197 4198/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4199/// processing the delayed method declaration for Method. The method 4200/// declaration is now considered finished. There may be a separate 4201/// ActOnStartOfFunctionDef action later (not necessarily 4202/// immediately!) for this method, if it was also defined inside the 4203/// class body. 4204void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4205 if (!MethodD) 4206 return; 4207 4208 AdjustDeclIfTemplate(MethodD); 4209 4210 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4211 4212 // Now that we have our default arguments, check the constructor 4213 // again. It could produce additional diagnostics or affect whether 4214 // the class has implicitly-declared destructors, among other 4215 // things. 4216 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4217 CheckConstructor(Constructor); 4218 4219 // Check the default arguments, which we may have added. 4220 if (!Method->isInvalidDecl()) 4221 CheckCXXDefaultArguments(Method); 4222} 4223 4224/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4225/// the well-formedness of the constructor declarator @p D with type @p 4226/// R. If there are any errors in the declarator, this routine will 4227/// emit diagnostics and set the invalid bit to true. In any case, the type 4228/// will be updated to reflect a well-formed type for the constructor and 4229/// returned. 4230QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4231 StorageClass &SC) { 4232 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4233 4234 // C++ [class.ctor]p3: 4235 // A constructor shall not be virtual (10.3) or static (9.4). A 4236 // constructor can be invoked for a const, volatile or const 4237 // volatile object. A constructor shall not be declared const, 4238 // volatile, or const volatile (9.3.2). 4239 if (isVirtual) { 4240 if (!D.isInvalidType()) 4241 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4242 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4243 << SourceRange(D.getIdentifierLoc()); 4244 D.setInvalidType(); 4245 } 4246 if (SC == SC_Static) { 4247 if (!D.isInvalidType()) 4248 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4249 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4250 << SourceRange(D.getIdentifierLoc()); 4251 D.setInvalidType(); 4252 SC = SC_None; 4253 } 4254 4255 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4256 if (FTI.TypeQuals != 0) { 4257 if (FTI.TypeQuals & Qualifiers::Const) 4258 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4259 << "const" << SourceRange(D.getIdentifierLoc()); 4260 if (FTI.TypeQuals & Qualifiers::Volatile) 4261 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4262 << "volatile" << SourceRange(D.getIdentifierLoc()); 4263 if (FTI.TypeQuals & Qualifiers::Restrict) 4264 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4265 << "restrict" << SourceRange(D.getIdentifierLoc()); 4266 D.setInvalidType(); 4267 } 4268 4269 // C++0x [class.ctor]p4: 4270 // A constructor shall not be declared with a ref-qualifier. 4271 if (FTI.hasRefQualifier()) { 4272 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4273 << FTI.RefQualifierIsLValueRef 4274 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4275 D.setInvalidType(); 4276 } 4277 4278 // Rebuild the function type "R" without any type qualifiers (in 4279 // case any of the errors above fired) and with "void" as the 4280 // return type, since constructors don't have return types. 4281 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4282 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4283 return R; 4284 4285 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4286 EPI.TypeQuals = 0; 4287 EPI.RefQualifier = RQ_None; 4288 4289 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4290 Proto->getNumArgs(), EPI); 4291} 4292 4293/// CheckConstructor - Checks a fully-formed constructor for 4294/// well-formedness, issuing any diagnostics required. Returns true if 4295/// the constructor declarator is invalid. 4296void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4297 CXXRecordDecl *ClassDecl 4298 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4299 if (!ClassDecl) 4300 return Constructor->setInvalidDecl(); 4301 4302 // C++ [class.copy]p3: 4303 // A declaration of a constructor for a class X is ill-formed if 4304 // its first parameter is of type (optionally cv-qualified) X and 4305 // either there are no other parameters or else all other 4306 // parameters have default arguments. 4307 if (!Constructor->isInvalidDecl() && 4308 ((Constructor->getNumParams() == 1) || 4309 (Constructor->getNumParams() > 1 && 4310 Constructor->getParamDecl(1)->hasDefaultArg())) && 4311 Constructor->getTemplateSpecializationKind() 4312 != TSK_ImplicitInstantiation) { 4313 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4314 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4315 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4316 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4317 const char *ConstRef 4318 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4319 : " const &"; 4320 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4321 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4322 4323 // FIXME: Rather that making the constructor invalid, we should endeavor 4324 // to fix the type. 4325 Constructor->setInvalidDecl(); 4326 } 4327 } 4328} 4329 4330/// CheckDestructor - Checks a fully-formed destructor definition for 4331/// well-formedness, issuing any diagnostics required. Returns true 4332/// on error. 4333bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4334 CXXRecordDecl *RD = Destructor->getParent(); 4335 4336 if (Destructor->isVirtual()) { 4337 SourceLocation Loc; 4338 4339 if (!Destructor->isImplicit()) 4340 Loc = Destructor->getLocation(); 4341 else 4342 Loc = RD->getLocation(); 4343 4344 // If we have a virtual destructor, look up the deallocation function 4345 FunctionDecl *OperatorDelete = 0; 4346 DeclarationName Name = 4347 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4348 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4349 return true; 4350 4351 MarkDeclarationReferenced(Loc, OperatorDelete); 4352 4353 Destructor->setOperatorDelete(OperatorDelete); 4354 } 4355 4356 return false; 4357} 4358 4359static inline bool 4360FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4361 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4362 FTI.ArgInfo[0].Param && 4363 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4364} 4365 4366/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4367/// the well-formednes of the destructor declarator @p D with type @p 4368/// R. If there are any errors in the declarator, this routine will 4369/// emit diagnostics and set the declarator to invalid. Even if this happens, 4370/// will be updated to reflect a well-formed type for the destructor and 4371/// returned. 4372QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4373 StorageClass& SC) { 4374 // C++ [class.dtor]p1: 4375 // [...] A typedef-name that names a class is a class-name 4376 // (7.1.3); however, a typedef-name that names a class shall not 4377 // be used as the identifier in the declarator for a destructor 4378 // declaration. 4379 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4380 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4381 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4382 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4383 else if (const TemplateSpecializationType *TST = 4384 DeclaratorType->getAs<TemplateSpecializationType>()) 4385 if (TST->isTypeAlias()) 4386 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4387 << DeclaratorType << 1; 4388 4389 // C++ [class.dtor]p2: 4390 // A destructor is used to destroy objects of its class type. A 4391 // destructor takes no parameters, and no return type can be 4392 // specified for it (not even void). The address of a destructor 4393 // shall not be taken. A destructor shall not be static. A 4394 // destructor can be invoked for a const, volatile or const 4395 // volatile object. A destructor shall not be declared const, 4396 // volatile or const volatile (9.3.2). 4397 if (SC == SC_Static) { 4398 if (!D.isInvalidType()) 4399 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4400 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4401 << SourceRange(D.getIdentifierLoc()) 4402 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4403 4404 SC = SC_None; 4405 } 4406 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4407 // Destructors don't have return types, but the parser will 4408 // happily parse something like: 4409 // 4410 // class X { 4411 // float ~X(); 4412 // }; 4413 // 4414 // The return type will be eliminated later. 4415 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4416 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4417 << SourceRange(D.getIdentifierLoc()); 4418 } 4419 4420 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4421 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4422 if (FTI.TypeQuals & Qualifiers::Const) 4423 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4424 << "const" << SourceRange(D.getIdentifierLoc()); 4425 if (FTI.TypeQuals & Qualifiers::Volatile) 4426 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4427 << "volatile" << SourceRange(D.getIdentifierLoc()); 4428 if (FTI.TypeQuals & Qualifiers::Restrict) 4429 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4430 << "restrict" << SourceRange(D.getIdentifierLoc()); 4431 D.setInvalidType(); 4432 } 4433 4434 // C++0x [class.dtor]p2: 4435 // A destructor shall not be declared with a ref-qualifier. 4436 if (FTI.hasRefQualifier()) { 4437 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4438 << FTI.RefQualifierIsLValueRef 4439 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4440 D.setInvalidType(); 4441 } 4442 4443 // Make sure we don't have any parameters. 4444 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4445 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4446 4447 // Delete the parameters. 4448 FTI.freeArgs(); 4449 D.setInvalidType(); 4450 } 4451 4452 // Make sure the destructor isn't variadic. 4453 if (FTI.isVariadic) { 4454 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4455 D.setInvalidType(); 4456 } 4457 4458 // Rebuild the function type "R" without any type qualifiers or 4459 // parameters (in case any of the errors above fired) and with 4460 // "void" as the return type, since destructors don't have return 4461 // types. 4462 if (!D.isInvalidType()) 4463 return R; 4464 4465 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4466 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4467 EPI.Variadic = false; 4468 EPI.TypeQuals = 0; 4469 EPI.RefQualifier = RQ_None; 4470 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4471} 4472 4473/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4474/// well-formednes of the conversion function declarator @p D with 4475/// type @p R. If there are any errors in the declarator, this routine 4476/// will emit diagnostics and return true. Otherwise, it will return 4477/// false. Either way, the type @p R will be updated to reflect a 4478/// well-formed type for the conversion operator. 4479void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4480 StorageClass& SC) { 4481 // C++ [class.conv.fct]p1: 4482 // Neither parameter types nor return type can be specified. The 4483 // type of a conversion function (8.3.5) is "function taking no 4484 // parameter returning conversion-type-id." 4485 if (SC == SC_Static) { 4486 if (!D.isInvalidType()) 4487 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4488 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4489 << SourceRange(D.getIdentifierLoc()); 4490 D.setInvalidType(); 4491 SC = SC_None; 4492 } 4493 4494 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4495 4496 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4497 // Conversion functions don't have return types, but the parser will 4498 // happily parse something like: 4499 // 4500 // class X { 4501 // float operator bool(); 4502 // }; 4503 // 4504 // The return type will be changed later anyway. 4505 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4506 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4507 << SourceRange(D.getIdentifierLoc()); 4508 D.setInvalidType(); 4509 } 4510 4511 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4512 4513 // Make sure we don't have any parameters. 4514 if (Proto->getNumArgs() > 0) { 4515 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4516 4517 // Delete the parameters. 4518 D.getFunctionTypeInfo().freeArgs(); 4519 D.setInvalidType(); 4520 } else if (Proto->isVariadic()) { 4521 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4522 D.setInvalidType(); 4523 } 4524 4525 // Diagnose "&operator bool()" and other such nonsense. This 4526 // is actually a gcc extension which we don't support. 4527 if (Proto->getResultType() != ConvType) { 4528 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4529 << Proto->getResultType(); 4530 D.setInvalidType(); 4531 ConvType = Proto->getResultType(); 4532 } 4533 4534 // C++ [class.conv.fct]p4: 4535 // The conversion-type-id shall not represent a function type nor 4536 // an array type. 4537 if (ConvType->isArrayType()) { 4538 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4539 ConvType = Context.getPointerType(ConvType); 4540 D.setInvalidType(); 4541 } else if (ConvType->isFunctionType()) { 4542 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4543 ConvType = Context.getPointerType(ConvType); 4544 D.setInvalidType(); 4545 } 4546 4547 // Rebuild the function type "R" without any parameters (in case any 4548 // of the errors above fired) and with the conversion type as the 4549 // return type. 4550 if (D.isInvalidType()) 4551 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4552 4553 // C++0x explicit conversion operators. 4554 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4555 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4556 diag::warn_explicit_conversion_functions) 4557 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4558} 4559 4560/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4561/// the declaration of the given C++ conversion function. This routine 4562/// is responsible for recording the conversion function in the C++ 4563/// class, if possible. 4564Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4565 assert(Conversion && "Expected to receive a conversion function declaration"); 4566 4567 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4568 4569 // Make sure we aren't redeclaring the conversion function. 4570 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4571 4572 // C++ [class.conv.fct]p1: 4573 // [...] A conversion function is never used to convert a 4574 // (possibly cv-qualified) object to the (possibly cv-qualified) 4575 // same object type (or a reference to it), to a (possibly 4576 // cv-qualified) base class of that type (or a reference to it), 4577 // or to (possibly cv-qualified) void. 4578 // FIXME: Suppress this warning if the conversion function ends up being a 4579 // virtual function that overrides a virtual function in a base class. 4580 QualType ClassType 4581 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4582 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4583 ConvType = ConvTypeRef->getPointeeType(); 4584 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4585 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4586 /* Suppress diagnostics for instantiations. */; 4587 else if (ConvType->isRecordType()) { 4588 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4589 if (ConvType == ClassType) 4590 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4591 << ClassType; 4592 else if (IsDerivedFrom(ClassType, ConvType)) 4593 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4594 << ClassType << ConvType; 4595 } else if (ConvType->isVoidType()) { 4596 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4597 << ClassType << ConvType; 4598 } 4599 4600 if (FunctionTemplateDecl *ConversionTemplate 4601 = Conversion->getDescribedFunctionTemplate()) 4602 return ConversionTemplate; 4603 4604 return Conversion; 4605} 4606 4607//===----------------------------------------------------------------------===// 4608// Namespace Handling 4609//===----------------------------------------------------------------------===// 4610 4611 4612 4613/// ActOnStartNamespaceDef - This is called at the start of a namespace 4614/// definition. 4615Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4616 SourceLocation InlineLoc, 4617 SourceLocation NamespaceLoc, 4618 SourceLocation IdentLoc, 4619 IdentifierInfo *II, 4620 SourceLocation LBrace, 4621 AttributeList *AttrList) { 4622 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4623 // For anonymous namespace, take the location of the left brace. 4624 SourceLocation Loc = II ? IdentLoc : LBrace; 4625 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4626 StartLoc, Loc, II); 4627 Namespc->setInline(InlineLoc.isValid()); 4628 4629 Scope *DeclRegionScope = NamespcScope->getParent(); 4630 4631 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4632 4633 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4634 PushNamespaceVisibilityAttr(Attr); 4635 4636 if (II) { 4637 // C++ [namespace.def]p2: 4638 // The identifier in an original-namespace-definition shall not 4639 // have been previously defined in the declarative region in 4640 // which the original-namespace-definition appears. The 4641 // identifier in an original-namespace-definition is the name of 4642 // the namespace. Subsequently in that declarative region, it is 4643 // treated as an original-namespace-name. 4644 // 4645 // Since namespace names are unique in their scope, and we don't 4646 // look through using directives, just look for any ordinary names. 4647 4648 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4649 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4650 Decl::IDNS_Namespace; 4651 NamedDecl *PrevDecl = 0; 4652 for (DeclContext::lookup_result R 4653 = CurContext->getRedeclContext()->lookup(II); 4654 R.first != R.second; ++R.first) { 4655 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4656 PrevDecl = *R.first; 4657 break; 4658 } 4659 } 4660 4661 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4662 // This is an extended namespace definition. 4663 if (Namespc->isInline() != OrigNS->isInline()) { 4664 // inline-ness must match 4665 if (OrigNS->isInline()) { 4666 // The user probably just forgot the 'inline', so suggest that it 4667 // be added back. 4668 Diag(Namespc->getLocation(), 4669 diag::warn_inline_namespace_reopened_noninline) 4670 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4671 } else { 4672 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4673 << Namespc->isInline(); 4674 } 4675 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4676 4677 // Recover by ignoring the new namespace's inline status. 4678 Namespc->setInline(OrigNS->isInline()); 4679 } 4680 4681 // Attach this namespace decl to the chain of extended namespace 4682 // definitions. 4683 OrigNS->setNextNamespace(Namespc); 4684 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4685 4686 // Remove the previous declaration from the scope. 4687 if (DeclRegionScope->isDeclScope(OrigNS)) { 4688 IdResolver.RemoveDecl(OrigNS); 4689 DeclRegionScope->RemoveDecl(OrigNS); 4690 } 4691 } else if (PrevDecl) { 4692 // This is an invalid name redefinition. 4693 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4694 << Namespc->getDeclName(); 4695 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4696 Namespc->setInvalidDecl(); 4697 // Continue on to push Namespc as current DeclContext and return it. 4698 } else if (II->isStr("std") && 4699 CurContext->getRedeclContext()->isTranslationUnit()) { 4700 // This is the first "real" definition of the namespace "std", so update 4701 // our cache of the "std" namespace to point at this definition. 4702 if (NamespaceDecl *StdNS = getStdNamespace()) { 4703 // We had already defined a dummy namespace "std". Link this new 4704 // namespace definition to the dummy namespace "std". 4705 StdNS->setNextNamespace(Namespc); 4706 StdNS->setLocation(IdentLoc); 4707 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4708 } 4709 4710 // Make our StdNamespace cache point at the first real definition of the 4711 // "std" namespace. 4712 StdNamespace = Namespc; 4713 } 4714 4715 PushOnScopeChains(Namespc, DeclRegionScope); 4716 } else { 4717 // Anonymous namespaces. 4718 assert(Namespc->isAnonymousNamespace()); 4719 4720 // Link the anonymous namespace into its parent. 4721 NamespaceDecl *PrevDecl; 4722 DeclContext *Parent = CurContext->getRedeclContext(); 4723 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4724 PrevDecl = TU->getAnonymousNamespace(); 4725 TU->setAnonymousNamespace(Namespc); 4726 } else { 4727 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4728 PrevDecl = ND->getAnonymousNamespace(); 4729 ND->setAnonymousNamespace(Namespc); 4730 } 4731 4732 // Link the anonymous namespace with its previous declaration. 4733 if (PrevDecl) { 4734 assert(PrevDecl->isAnonymousNamespace()); 4735 assert(!PrevDecl->getNextNamespace()); 4736 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4737 PrevDecl->setNextNamespace(Namespc); 4738 4739 if (Namespc->isInline() != PrevDecl->isInline()) { 4740 // inline-ness must match 4741 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4742 << Namespc->isInline(); 4743 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4744 Namespc->setInvalidDecl(); 4745 // Recover by ignoring the new namespace's inline status. 4746 Namespc->setInline(PrevDecl->isInline()); 4747 } 4748 } 4749 4750 CurContext->addDecl(Namespc); 4751 4752 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4753 // behaves as if it were replaced by 4754 // namespace unique { /* empty body */ } 4755 // using namespace unique; 4756 // namespace unique { namespace-body } 4757 // where all occurrences of 'unique' in a translation unit are 4758 // replaced by the same identifier and this identifier differs 4759 // from all other identifiers in the entire program. 4760 4761 // We just create the namespace with an empty name and then add an 4762 // implicit using declaration, just like the standard suggests. 4763 // 4764 // CodeGen enforces the "universally unique" aspect by giving all 4765 // declarations semantically contained within an anonymous 4766 // namespace internal linkage. 4767 4768 if (!PrevDecl) { 4769 UsingDirectiveDecl* UD 4770 = UsingDirectiveDecl::Create(Context, CurContext, 4771 /* 'using' */ LBrace, 4772 /* 'namespace' */ SourceLocation(), 4773 /* qualifier */ NestedNameSpecifierLoc(), 4774 /* identifier */ SourceLocation(), 4775 Namespc, 4776 /* Ancestor */ CurContext); 4777 UD->setImplicit(); 4778 CurContext->addDecl(UD); 4779 } 4780 } 4781 4782 // Although we could have an invalid decl (i.e. the namespace name is a 4783 // redefinition), push it as current DeclContext and try to continue parsing. 4784 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4785 // for the namespace has the declarations that showed up in that particular 4786 // namespace definition. 4787 PushDeclContext(NamespcScope, Namespc); 4788 return Namespc; 4789} 4790 4791/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4792/// is a namespace alias, returns the namespace it points to. 4793static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4794 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4795 return AD->getNamespace(); 4796 return dyn_cast_or_null<NamespaceDecl>(D); 4797} 4798 4799/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4800/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4801void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4802 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4803 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4804 Namespc->setRBraceLoc(RBrace); 4805 PopDeclContext(); 4806 if (Namespc->hasAttr<VisibilityAttr>()) 4807 PopPragmaVisibility(); 4808} 4809 4810CXXRecordDecl *Sema::getStdBadAlloc() const { 4811 return cast_or_null<CXXRecordDecl>( 4812 StdBadAlloc.get(Context.getExternalSource())); 4813} 4814 4815NamespaceDecl *Sema::getStdNamespace() const { 4816 return cast_or_null<NamespaceDecl>( 4817 StdNamespace.get(Context.getExternalSource())); 4818} 4819 4820/// \brief Retrieve the special "std" namespace, which may require us to 4821/// implicitly define the namespace. 4822NamespaceDecl *Sema::getOrCreateStdNamespace() { 4823 if (!StdNamespace) { 4824 // The "std" namespace has not yet been defined, so build one implicitly. 4825 StdNamespace = NamespaceDecl::Create(Context, 4826 Context.getTranslationUnitDecl(), 4827 SourceLocation(), SourceLocation(), 4828 &PP.getIdentifierTable().get("std")); 4829 getStdNamespace()->setImplicit(true); 4830 } 4831 4832 return getStdNamespace(); 4833} 4834 4835/// \brief Determine whether a using statement is in a context where it will be 4836/// apply in all contexts. 4837static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4838 switch (CurContext->getDeclKind()) { 4839 case Decl::TranslationUnit: 4840 return true; 4841 case Decl::LinkageSpec: 4842 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4843 default: 4844 return false; 4845 } 4846} 4847 4848Decl *Sema::ActOnUsingDirective(Scope *S, 4849 SourceLocation UsingLoc, 4850 SourceLocation NamespcLoc, 4851 CXXScopeSpec &SS, 4852 SourceLocation IdentLoc, 4853 IdentifierInfo *NamespcName, 4854 AttributeList *AttrList) { 4855 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4856 assert(NamespcName && "Invalid NamespcName."); 4857 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4858 4859 // This can only happen along a recovery path. 4860 while (S->getFlags() & Scope::TemplateParamScope) 4861 S = S->getParent(); 4862 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4863 4864 UsingDirectiveDecl *UDir = 0; 4865 NestedNameSpecifier *Qualifier = 0; 4866 if (SS.isSet()) 4867 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4868 4869 // Lookup namespace name. 4870 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4871 LookupParsedName(R, S, &SS); 4872 if (R.isAmbiguous()) 4873 return 0; 4874 4875 if (R.empty()) { 4876 // Allow "using namespace std;" or "using namespace ::std;" even if 4877 // "std" hasn't been defined yet, for GCC compatibility. 4878 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4879 NamespcName->isStr("std")) { 4880 Diag(IdentLoc, diag::ext_using_undefined_std); 4881 R.addDecl(getOrCreateStdNamespace()); 4882 R.resolveKind(); 4883 } 4884 // Otherwise, attempt typo correction. 4885 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4886 CTC_NoKeywords, 0)) { 4887 if (R.getAsSingle<NamespaceDecl>() || 4888 R.getAsSingle<NamespaceAliasDecl>()) { 4889 if (DeclContext *DC = computeDeclContext(SS, false)) 4890 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4891 << NamespcName << DC << Corrected << SS.getRange() 4892 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4893 else 4894 Diag(IdentLoc, diag::err_using_directive_suggest) 4895 << NamespcName << Corrected 4896 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4897 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4898 << Corrected; 4899 4900 NamespcName = Corrected.getAsIdentifierInfo(); 4901 } else { 4902 R.clear(); 4903 R.setLookupName(NamespcName); 4904 } 4905 } 4906 } 4907 4908 if (!R.empty()) { 4909 NamedDecl *Named = R.getFoundDecl(); 4910 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4911 && "expected namespace decl"); 4912 // C++ [namespace.udir]p1: 4913 // A using-directive specifies that the names in the nominated 4914 // namespace can be used in the scope in which the 4915 // using-directive appears after the using-directive. During 4916 // unqualified name lookup (3.4.1), the names appear as if they 4917 // were declared in the nearest enclosing namespace which 4918 // contains both the using-directive and the nominated 4919 // namespace. [Note: in this context, "contains" means "contains 4920 // directly or indirectly". ] 4921 4922 // Find enclosing context containing both using-directive and 4923 // nominated namespace. 4924 NamespaceDecl *NS = getNamespaceDecl(Named); 4925 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4926 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4927 CommonAncestor = CommonAncestor->getParent(); 4928 4929 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4930 SS.getWithLocInContext(Context), 4931 IdentLoc, Named, CommonAncestor); 4932 4933 if (IsUsingDirectiveInToplevelContext(CurContext) && 4934 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4935 Diag(IdentLoc, diag::warn_using_directive_in_header); 4936 } 4937 4938 PushUsingDirective(S, UDir); 4939 } else { 4940 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4941 } 4942 4943 // FIXME: We ignore attributes for now. 4944 return UDir; 4945} 4946 4947void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4948 // If scope has associated entity, then using directive is at namespace 4949 // or translation unit scope. We add UsingDirectiveDecls, into 4950 // it's lookup structure. 4951 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4952 Ctx->addDecl(UDir); 4953 else 4954 // Otherwise it is block-sope. using-directives will affect lookup 4955 // only to the end of scope. 4956 S->PushUsingDirective(UDir); 4957} 4958 4959 4960Decl *Sema::ActOnUsingDeclaration(Scope *S, 4961 AccessSpecifier AS, 4962 bool HasUsingKeyword, 4963 SourceLocation UsingLoc, 4964 CXXScopeSpec &SS, 4965 UnqualifiedId &Name, 4966 AttributeList *AttrList, 4967 bool IsTypeName, 4968 SourceLocation TypenameLoc) { 4969 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4970 4971 switch (Name.getKind()) { 4972 case UnqualifiedId::IK_Identifier: 4973 case UnqualifiedId::IK_OperatorFunctionId: 4974 case UnqualifiedId::IK_LiteralOperatorId: 4975 case UnqualifiedId::IK_ConversionFunctionId: 4976 break; 4977 4978 case UnqualifiedId::IK_ConstructorName: 4979 case UnqualifiedId::IK_ConstructorTemplateId: 4980 // C++0x inherited constructors. 4981 if (getLangOptions().CPlusPlus0x) break; 4982 4983 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4984 << SS.getRange(); 4985 return 0; 4986 4987 case UnqualifiedId::IK_DestructorName: 4988 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4989 << SS.getRange(); 4990 return 0; 4991 4992 case UnqualifiedId::IK_TemplateId: 4993 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4994 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4995 return 0; 4996 } 4997 4998 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4999 DeclarationName TargetName = TargetNameInfo.getName(); 5000 if (!TargetName) 5001 return 0; 5002 5003 // Warn about using declarations. 5004 // TODO: store that the declaration was written without 'using' and 5005 // talk about access decls instead of using decls in the 5006 // diagnostics. 5007 if (!HasUsingKeyword) { 5008 UsingLoc = Name.getSourceRange().getBegin(); 5009 5010 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5011 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5012 } 5013 5014 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5015 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5016 return 0; 5017 5018 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5019 TargetNameInfo, AttrList, 5020 /* IsInstantiation */ false, 5021 IsTypeName, TypenameLoc); 5022 if (UD) 5023 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5024 5025 return UD; 5026} 5027 5028/// \brief Determine whether a using declaration considers the given 5029/// declarations as "equivalent", e.g., if they are redeclarations of 5030/// the same entity or are both typedefs of the same type. 5031static bool 5032IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5033 bool &SuppressRedeclaration) { 5034 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5035 SuppressRedeclaration = false; 5036 return true; 5037 } 5038 5039 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5040 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5041 SuppressRedeclaration = true; 5042 return Context.hasSameType(TD1->getUnderlyingType(), 5043 TD2->getUnderlyingType()); 5044 } 5045 5046 return false; 5047} 5048 5049 5050/// Determines whether to create a using shadow decl for a particular 5051/// decl, given the set of decls existing prior to this using lookup. 5052bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5053 const LookupResult &Previous) { 5054 // Diagnose finding a decl which is not from a base class of the 5055 // current class. We do this now because there are cases where this 5056 // function will silently decide not to build a shadow decl, which 5057 // will pre-empt further diagnostics. 5058 // 5059 // We don't need to do this in C++0x because we do the check once on 5060 // the qualifier. 5061 // 5062 // FIXME: diagnose the following if we care enough: 5063 // struct A { int foo; }; 5064 // struct B : A { using A::foo; }; 5065 // template <class T> struct C : A {}; 5066 // template <class T> struct D : C<T> { using B::foo; } // <--- 5067 // This is invalid (during instantiation) in C++03 because B::foo 5068 // resolves to the using decl in B, which is not a base class of D<T>. 5069 // We can't diagnose it immediately because C<T> is an unknown 5070 // specialization. The UsingShadowDecl in D<T> then points directly 5071 // to A::foo, which will look well-formed when we instantiate. 5072 // The right solution is to not collapse the shadow-decl chain. 5073 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5074 DeclContext *OrigDC = Orig->getDeclContext(); 5075 5076 // Handle enums and anonymous structs. 5077 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5078 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5079 while (OrigRec->isAnonymousStructOrUnion()) 5080 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5081 5082 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5083 if (OrigDC == CurContext) { 5084 Diag(Using->getLocation(), 5085 diag::err_using_decl_nested_name_specifier_is_current_class) 5086 << Using->getQualifierLoc().getSourceRange(); 5087 Diag(Orig->getLocation(), diag::note_using_decl_target); 5088 return true; 5089 } 5090 5091 Diag(Using->getQualifierLoc().getBeginLoc(), 5092 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5093 << Using->getQualifier() 5094 << cast<CXXRecordDecl>(CurContext) 5095 << Using->getQualifierLoc().getSourceRange(); 5096 Diag(Orig->getLocation(), diag::note_using_decl_target); 5097 return true; 5098 } 5099 } 5100 5101 if (Previous.empty()) return false; 5102 5103 NamedDecl *Target = Orig; 5104 if (isa<UsingShadowDecl>(Target)) 5105 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5106 5107 // If the target happens to be one of the previous declarations, we 5108 // don't have a conflict. 5109 // 5110 // FIXME: but we might be increasing its access, in which case we 5111 // should redeclare it. 5112 NamedDecl *NonTag = 0, *Tag = 0; 5113 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5114 I != E; ++I) { 5115 NamedDecl *D = (*I)->getUnderlyingDecl(); 5116 bool Result; 5117 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5118 return Result; 5119 5120 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5121 } 5122 5123 if (Target->isFunctionOrFunctionTemplate()) { 5124 FunctionDecl *FD; 5125 if (isa<FunctionTemplateDecl>(Target)) 5126 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5127 else 5128 FD = cast<FunctionDecl>(Target); 5129 5130 NamedDecl *OldDecl = 0; 5131 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5132 case Ovl_Overload: 5133 return false; 5134 5135 case Ovl_NonFunction: 5136 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5137 break; 5138 5139 // We found a decl with the exact signature. 5140 case Ovl_Match: 5141 // If we're in a record, we want to hide the target, so we 5142 // return true (without a diagnostic) to tell the caller not to 5143 // build a shadow decl. 5144 if (CurContext->isRecord()) 5145 return true; 5146 5147 // If we're not in a record, this is an error. 5148 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5149 break; 5150 } 5151 5152 Diag(Target->getLocation(), diag::note_using_decl_target); 5153 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5154 return true; 5155 } 5156 5157 // Target is not a function. 5158 5159 if (isa<TagDecl>(Target)) { 5160 // No conflict between a tag and a non-tag. 5161 if (!Tag) return false; 5162 5163 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5164 Diag(Target->getLocation(), diag::note_using_decl_target); 5165 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5166 return true; 5167 } 5168 5169 // No conflict between a tag and a non-tag. 5170 if (!NonTag) return false; 5171 5172 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5173 Diag(Target->getLocation(), diag::note_using_decl_target); 5174 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5175 return true; 5176} 5177 5178/// Builds a shadow declaration corresponding to a 'using' declaration. 5179UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5180 UsingDecl *UD, 5181 NamedDecl *Orig) { 5182 5183 // If we resolved to another shadow declaration, just coalesce them. 5184 NamedDecl *Target = Orig; 5185 if (isa<UsingShadowDecl>(Target)) { 5186 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5187 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5188 } 5189 5190 UsingShadowDecl *Shadow 5191 = UsingShadowDecl::Create(Context, CurContext, 5192 UD->getLocation(), UD, Target); 5193 UD->addShadowDecl(Shadow); 5194 5195 Shadow->setAccess(UD->getAccess()); 5196 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5197 Shadow->setInvalidDecl(); 5198 5199 if (S) 5200 PushOnScopeChains(Shadow, S); 5201 else 5202 CurContext->addDecl(Shadow); 5203 5204 5205 return Shadow; 5206} 5207 5208/// Hides a using shadow declaration. This is required by the current 5209/// using-decl implementation when a resolvable using declaration in a 5210/// class is followed by a declaration which would hide or override 5211/// one or more of the using decl's targets; for example: 5212/// 5213/// struct Base { void foo(int); }; 5214/// struct Derived : Base { 5215/// using Base::foo; 5216/// void foo(int); 5217/// }; 5218/// 5219/// The governing language is C++03 [namespace.udecl]p12: 5220/// 5221/// When a using-declaration brings names from a base class into a 5222/// derived class scope, member functions in the derived class 5223/// override and/or hide member functions with the same name and 5224/// parameter types in a base class (rather than conflicting). 5225/// 5226/// There are two ways to implement this: 5227/// (1) optimistically create shadow decls when they're not hidden 5228/// by existing declarations, or 5229/// (2) don't create any shadow decls (or at least don't make them 5230/// visible) until we've fully parsed/instantiated the class. 5231/// The problem with (1) is that we might have to retroactively remove 5232/// a shadow decl, which requires several O(n) operations because the 5233/// decl structures are (very reasonably) not designed for removal. 5234/// (2) avoids this but is very fiddly and phase-dependent. 5235void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5236 if (Shadow->getDeclName().getNameKind() == 5237 DeclarationName::CXXConversionFunctionName) 5238 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5239 5240 // Remove it from the DeclContext... 5241 Shadow->getDeclContext()->removeDecl(Shadow); 5242 5243 // ...and the scope, if applicable... 5244 if (S) { 5245 S->RemoveDecl(Shadow); 5246 IdResolver.RemoveDecl(Shadow); 5247 } 5248 5249 // ...and the using decl. 5250 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5251 5252 // TODO: complain somehow if Shadow was used. It shouldn't 5253 // be possible for this to happen, because...? 5254} 5255 5256/// Builds a using declaration. 5257/// 5258/// \param IsInstantiation - Whether this call arises from an 5259/// instantiation of an unresolved using declaration. We treat 5260/// the lookup differently for these declarations. 5261NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5262 SourceLocation UsingLoc, 5263 CXXScopeSpec &SS, 5264 const DeclarationNameInfo &NameInfo, 5265 AttributeList *AttrList, 5266 bool IsInstantiation, 5267 bool IsTypeName, 5268 SourceLocation TypenameLoc) { 5269 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5270 SourceLocation IdentLoc = NameInfo.getLoc(); 5271 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5272 5273 // FIXME: We ignore attributes for now. 5274 5275 if (SS.isEmpty()) { 5276 Diag(IdentLoc, diag::err_using_requires_qualname); 5277 return 0; 5278 } 5279 5280 // Do the redeclaration lookup in the current scope. 5281 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5282 ForRedeclaration); 5283 Previous.setHideTags(false); 5284 if (S) { 5285 LookupName(Previous, S); 5286 5287 // It is really dumb that we have to do this. 5288 LookupResult::Filter F = Previous.makeFilter(); 5289 while (F.hasNext()) { 5290 NamedDecl *D = F.next(); 5291 if (!isDeclInScope(D, CurContext, S)) 5292 F.erase(); 5293 } 5294 F.done(); 5295 } else { 5296 assert(IsInstantiation && "no scope in non-instantiation"); 5297 assert(CurContext->isRecord() && "scope not record in instantiation"); 5298 LookupQualifiedName(Previous, CurContext); 5299 } 5300 5301 // Check for invalid redeclarations. 5302 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5303 return 0; 5304 5305 // Check for bad qualifiers. 5306 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5307 return 0; 5308 5309 DeclContext *LookupContext = computeDeclContext(SS); 5310 NamedDecl *D; 5311 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5312 if (!LookupContext) { 5313 if (IsTypeName) { 5314 // FIXME: not all declaration name kinds are legal here 5315 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5316 UsingLoc, TypenameLoc, 5317 QualifierLoc, 5318 IdentLoc, NameInfo.getName()); 5319 } else { 5320 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5321 QualifierLoc, NameInfo); 5322 } 5323 } else { 5324 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5325 NameInfo, IsTypeName); 5326 } 5327 D->setAccess(AS); 5328 CurContext->addDecl(D); 5329 5330 if (!LookupContext) return D; 5331 UsingDecl *UD = cast<UsingDecl>(D); 5332 5333 if (RequireCompleteDeclContext(SS, LookupContext)) { 5334 UD->setInvalidDecl(); 5335 return UD; 5336 } 5337 5338 // Constructor inheriting using decls get special treatment. 5339 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5340 if (CheckInheritedConstructorUsingDecl(UD)) 5341 UD->setInvalidDecl(); 5342 return UD; 5343 } 5344 5345 // Otherwise, look up the target name. 5346 5347 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5348 5349 // Unlike most lookups, we don't always want to hide tag 5350 // declarations: tag names are visible through the using declaration 5351 // even if hidden by ordinary names, *except* in a dependent context 5352 // where it's important for the sanity of two-phase lookup. 5353 if (!IsInstantiation) 5354 R.setHideTags(false); 5355 5356 LookupQualifiedName(R, LookupContext); 5357 5358 if (R.empty()) { 5359 Diag(IdentLoc, diag::err_no_member) 5360 << NameInfo.getName() << LookupContext << SS.getRange(); 5361 UD->setInvalidDecl(); 5362 return UD; 5363 } 5364 5365 if (R.isAmbiguous()) { 5366 UD->setInvalidDecl(); 5367 return UD; 5368 } 5369 5370 if (IsTypeName) { 5371 // If we asked for a typename and got a non-type decl, error out. 5372 if (!R.getAsSingle<TypeDecl>()) { 5373 Diag(IdentLoc, diag::err_using_typename_non_type); 5374 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5375 Diag((*I)->getUnderlyingDecl()->getLocation(), 5376 diag::note_using_decl_target); 5377 UD->setInvalidDecl(); 5378 return UD; 5379 } 5380 } else { 5381 // If we asked for a non-typename and we got a type, error out, 5382 // but only if this is an instantiation of an unresolved using 5383 // decl. Otherwise just silently find the type name. 5384 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5385 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5386 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5387 UD->setInvalidDecl(); 5388 return UD; 5389 } 5390 } 5391 5392 // C++0x N2914 [namespace.udecl]p6: 5393 // A using-declaration shall not name a namespace. 5394 if (R.getAsSingle<NamespaceDecl>()) { 5395 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5396 << SS.getRange(); 5397 UD->setInvalidDecl(); 5398 return UD; 5399 } 5400 5401 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5402 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5403 BuildUsingShadowDecl(S, UD, *I); 5404 } 5405 5406 return UD; 5407} 5408 5409/// Additional checks for a using declaration referring to a constructor name. 5410bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5411 if (UD->isTypeName()) { 5412 // FIXME: Cannot specify typename when specifying constructor 5413 return true; 5414 } 5415 5416 const Type *SourceType = UD->getQualifier()->getAsType(); 5417 assert(SourceType && 5418 "Using decl naming constructor doesn't have type in scope spec."); 5419 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5420 5421 // Check whether the named type is a direct base class. 5422 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5423 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5424 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5425 BaseIt != BaseE; ++BaseIt) { 5426 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5427 if (CanonicalSourceType == BaseType) 5428 break; 5429 } 5430 5431 if (BaseIt == BaseE) { 5432 // Did not find SourceType in the bases. 5433 Diag(UD->getUsingLocation(), 5434 diag::err_using_decl_constructor_not_in_direct_base) 5435 << UD->getNameInfo().getSourceRange() 5436 << QualType(SourceType, 0) << TargetClass; 5437 return true; 5438 } 5439 5440 BaseIt->setInheritConstructors(); 5441 5442 return false; 5443} 5444 5445/// Checks that the given using declaration is not an invalid 5446/// redeclaration. Note that this is checking only for the using decl 5447/// itself, not for any ill-formedness among the UsingShadowDecls. 5448bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5449 bool isTypeName, 5450 const CXXScopeSpec &SS, 5451 SourceLocation NameLoc, 5452 const LookupResult &Prev) { 5453 // C++03 [namespace.udecl]p8: 5454 // C++0x [namespace.udecl]p10: 5455 // A using-declaration is a declaration and can therefore be used 5456 // repeatedly where (and only where) multiple declarations are 5457 // allowed. 5458 // 5459 // That's in non-member contexts. 5460 if (!CurContext->getRedeclContext()->isRecord()) 5461 return false; 5462 5463 NestedNameSpecifier *Qual 5464 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5465 5466 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5467 NamedDecl *D = *I; 5468 5469 bool DTypename; 5470 NestedNameSpecifier *DQual; 5471 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5472 DTypename = UD->isTypeName(); 5473 DQual = UD->getQualifier(); 5474 } else if (UnresolvedUsingValueDecl *UD 5475 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5476 DTypename = false; 5477 DQual = UD->getQualifier(); 5478 } else if (UnresolvedUsingTypenameDecl *UD 5479 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5480 DTypename = true; 5481 DQual = UD->getQualifier(); 5482 } else continue; 5483 5484 // using decls differ if one says 'typename' and the other doesn't. 5485 // FIXME: non-dependent using decls? 5486 if (isTypeName != DTypename) continue; 5487 5488 // using decls differ if they name different scopes (but note that 5489 // template instantiation can cause this check to trigger when it 5490 // didn't before instantiation). 5491 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5492 Context.getCanonicalNestedNameSpecifier(DQual)) 5493 continue; 5494 5495 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5496 Diag(D->getLocation(), diag::note_using_decl) << 1; 5497 return true; 5498 } 5499 5500 return false; 5501} 5502 5503 5504/// Checks that the given nested-name qualifier used in a using decl 5505/// in the current context is appropriately related to the current 5506/// scope. If an error is found, diagnoses it and returns true. 5507bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5508 const CXXScopeSpec &SS, 5509 SourceLocation NameLoc) { 5510 DeclContext *NamedContext = computeDeclContext(SS); 5511 5512 if (!CurContext->isRecord()) { 5513 // C++03 [namespace.udecl]p3: 5514 // C++0x [namespace.udecl]p8: 5515 // A using-declaration for a class member shall be a member-declaration. 5516 5517 // If we weren't able to compute a valid scope, it must be a 5518 // dependent class scope. 5519 if (!NamedContext || NamedContext->isRecord()) { 5520 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5521 << SS.getRange(); 5522 return true; 5523 } 5524 5525 // Otherwise, everything is known to be fine. 5526 return false; 5527 } 5528 5529 // The current scope is a record. 5530 5531 // If the named context is dependent, we can't decide much. 5532 if (!NamedContext) { 5533 // FIXME: in C++0x, we can diagnose if we can prove that the 5534 // nested-name-specifier does not refer to a base class, which is 5535 // still possible in some cases. 5536 5537 // Otherwise we have to conservatively report that things might be 5538 // okay. 5539 return false; 5540 } 5541 5542 if (!NamedContext->isRecord()) { 5543 // Ideally this would point at the last name in the specifier, 5544 // but we don't have that level of source info. 5545 Diag(SS.getRange().getBegin(), 5546 diag::err_using_decl_nested_name_specifier_is_not_class) 5547 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5548 return true; 5549 } 5550 5551 if (!NamedContext->isDependentContext() && 5552 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5553 return true; 5554 5555 if (getLangOptions().CPlusPlus0x) { 5556 // C++0x [namespace.udecl]p3: 5557 // In a using-declaration used as a member-declaration, the 5558 // nested-name-specifier shall name a base class of the class 5559 // being defined. 5560 5561 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5562 cast<CXXRecordDecl>(NamedContext))) { 5563 if (CurContext == NamedContext) { 5564 Diag(NameLoc, 5565 diag::err_using_decl_nested_name_specifier_is_current_class) 5566 << SS.getRange(); 5567 return true; 5568 } 5569 5570 Diag(SS.getRange().getBegin(), 5571 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5572 << (NestedNameSpecifier*) SS.getScopeRep() 5573 << cast<CXXRecordDecl>(CurContext) 5574 << SS.getRange(); 5575 return true; 5576 } 5577 5578 return false; 5579 } 5580 5581 // C++03 [namespace.udecl]p4: 5582 // A using-declaration used as a member-declaration shall refer 5583 // to a member of a base class of the class being defined [etc.]. 5584 5585 // Salient point: SS doesn't have to name a base class as long as 5586 // lookup only finds members from base classes. Therefore we can 5587 // diagnose here only if we can prove that that can't happen, 5588 // i.e. if the class hierarchies provably don't intersect. 5589 5590 // TODO: it would be nice if "definitely valid" results were cached 5591 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5592 // need to be repeated. 5593 5594 struct UserData { 5595 llvm::DenseSet<const CXXRecordDecl*> Bases; 5596 5597 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5598 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5599 Data->Bases.insert(Base); 5600 return true; 5601 } 5602 5603 bool hasDependentBases(const CXXRecordDecl *Class) { 5604 return !Class->forallBases(collect, this); 5605 } 5606 5607 /// Returns true if the base is dependent or is one of the 5608 /// accumulated base classes. 5609 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5610 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5611 return !Data->Bases.count(Base); 5612 } 5613 5614 bool mightShareBases(const CXXRecordDecl *Class) { 5615 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5616 } 5617 }; 5618 5619 UserData Data; 5620 5621 // Returns false if we find a dependent base. 5622 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5623 return false; 5624 5625 // Returns false if the class has a dependent base or if it or one 5626 // of its bases is present in the base set of the current context. 5627 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5628 return false; 5629 5630 Diag(SS.getRange().getBegin(), 5631 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5632 << (NestedNameSpecifier*) SS.getScopeRep() 5633 << cast<CXXRecordDecl>(CurContext) 5634 << SS.getRange(); 5635 5636 return true; 5637} 5638 5639Decl *Sema::ActOnAliasDeclaration(Scope *S, 5640 AccessSpecifier AS, 5641 MultiTemplateParamsArg TemplateParamLists, 5642 SourceLocation UsingLoc, 5643 UnqualifiedId &Name, 5644 TypeResult Type) { 5645 // Skip up to the relevant declaration scope. 5646 while (S->getFlags() & Scope::TemplateParamScope) 5647 S = S->getParent(); 5648 assert((S->getFlags() & Scope::DeclScope) && 5649 "got alias-declaration outside of declaration scope"); 5650 5651 if (Type.isInvalid()) 5652 return 0; 5653 5654 bool Invalid = false; 5655 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5656 TypeSourceInfo *TInfo = 0; 5657 GetTypeFromParser(Type.get(), &TInfo); 5658 5659 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5660 return 0; 5661 5662 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5663 UPPC_DeclarationType)) { 5664 Invalid = true; 5665 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5666 TInfo->getTypeLoc().getBeginLoc()); 5667 } 5668 5669 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5670 LookupName(Previous, S); 5671 5672 // Warn about shadowing the name of a template parameter. 5673 if (Previous.isSingleResult() && 5674 Previous.getFoundDecl()->isTemplateParameter()) { 5675 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5676 Previous.getFoundDecl())) 5677 Invalid = true; 5678 Previous.clear(); 5679 } 5680 5681 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5682 "name in alias declaration must be an identifier"); 5683 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5684 Name.StartLocation, 5685 Name.Identifier, TInfo); 5686 5687 NewTD->setAccess(AS); 5688 5689 if (Invalid) 5690 NewTD->setInvalidDecl(); 5691 5692 CheckTypedefForVariablyModifiedType(S, NewTD); 5693 Invalid |= NewTD->isInvalidDecl(); 5694 5695 bool Redeclaration = false; 5696 5697 NamedDecl *NewND; 5698 if (TemplateParamLists.size()) { 5699 TypeAliasTemplateDecl *OldDecl = 0; 5700 TemplateParameterList *OldTemplateParams = 0; 5701 5702 if (TemplateParamLists.size() != 1) { 5703 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5704 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5705 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5706 } 5707 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5708 5709 // Only consider previous declarations in the same scope. 5710 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5711 /*ExplicitInstantiationOrSpecialization*/false); 5712 if (!Previous.empty()) { 5713 Redeclaration = true; 5714 5715 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5716 if (!OldDecl && !Invalid) { 5717 Diag(UsingLoc, diag::err_redefinition_different_kind) 5718 << Name.Identifier; 5719 5720 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5721 if (OldD->getLocation().isValid()) 5722 Diag(OldD->getLocation(), diag::note_previous_definition); 5723 5724 Invalid = true; 5725 } 5726 5727 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5728 if (TemplateParameterListsAreEqual(TemplateParams, 5729 OldDecl->getTemplateParameters(), 5730 /*Complain=*/true, 5731 TPL_TemplateMatch)) 5732 OldTemplateParams = OldDecl->getTemplateParameters(); 5733 else 5734 Invalid = true; 5735 5736 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5737 if (!Invalid && 5738 !Context.hasSameType(OldTD->getUnderlyingType(), 5739 NewTD->getUnderlyingType())) { 5740 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5741 // but we can't reasonably accept it. 5742 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5743 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5744 if (OldTD->getLocation().isValid()) 5745 Diag(OldTD->getLocation(), diag::note_previous_definition); 5746 Invalid = true; 5747 } 5748 } 5749 } 5750 5751 // Merge any previous default template arguments into our parameters, 5752 // and check the parameter list. 5753 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5754 TPC_TypeAliasTemplate)) 5755 return 0; 5756 5757 TypeAliasTemplateDecl *NewDecl = 5758 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5759 Name.Identifier, TemplateParams, 5760 NewTD); 5761 5762 NewDecl->setAccess(AS); 5763 5764 if (Invalid) 5765 NewDecl->setInvalidDecl(); 5766 else if (OldDecl) 5767 NewDecl->setPreviousDeclaration(OldDecl); 5768 5769 NewND = NewDecl; 5770 } else { 5771 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5772 NewND = NewTD; 5773 } 5774 5775 if (!Redeclaration) 5776 PushOnScopeChains(NewND, S); 5777 5778 return NewND; 5779} 5780 5781Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5782 SourceLocation NamespaceLoc, 5783 SourceLocation AliasLoc, 5784 IdentifierInfo *Alias, 5785 CXXScopeSpec &SS, 5786 SourceLocation IdentLoc, 5787 IdentifierInfo *Ident) { 5788 5789 // Lookup the namespace name. 5790 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5791 LookupParsedName(R, S, &SS); 5792 5793 // Check if we have a previous declaration with the same name. 5794 NamedDecl *PrevDecl 5795 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5796 ForRedeclaration); 5797 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5798 PrevDecl = 0; 5799 5800 if (PrevDecl) { 5801 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5802 // We already have an alias with the same name that points to the same 5803 // namespace, so don't create a new one. 5804 // FIXME: At some point, we'll want to create the (redundant) 5805 // declaration to maintain better source information. 5806 if (!R.isAmbiguous() && !R.empty() && 5807 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5808 return 0; 5809 } 5810 5811 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5812 diag::err_redefinition_different_kind; 5813 Diag(AliasLoc, DiagID) << Alias; 5814 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5815 return 0; 5816 } 5817 5818 if (R.isAmbiguous()) 5819 return 0; 5820 5821 if (R.empty()) { 5822 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5823 CTC_NoKeywords, 0)) { 5824 if (R.getAsSingle<NamespaceDecl>() || 5825 R.getAsSingle<NamespaceAliasDecl>()) { 5826 if (DeclContext *DC = computeDeclContext(SS, false)) 5827 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5828 << Ident << DC << Corrected << SS.getRange() 5829 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5830 else 5831 Diag(IdentLoc, diag::err_using_directive_suggest) 5832 << Ident << Corrected 5833 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5834 5835 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5836 << Corrected; 5837 5838 Ident = Corrected.getAsIdentifierInfo(); 5839 } else { 5840 R.clear(); 5841 R.setLookupName(Ident); 5842 } 5843 } 5844 5845 if (R.empty()) { 5846 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5847 return 0; 5848 } 5849 } 5850 5851 NamespaceAliasDecl *AliasDecl = 5852 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5853 Alias, SS.getWithLocInContext(Context), 5854 IdentLoc, R.getFoundDecl()); 5855 5856 PushOnScopeChains(AliasDecl, S); 5857 return AliasDecl; 5858} 5859 5860namespace { 5861 /// \brief Scoped object used to handle the state changes required in Sema 5862 /// to implicitly define the body of a C++ member function; 5863 class ImplicitlyDefinedFunctionScope { 5864 Sema &S; 5865 Sema::ContextRAII SavedContext; 5866 5867 public: 5868 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5869 : S(S), SavedContext(S, Method) 5870 { 5871 S.PushFunctionScope(); 5872 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5873 } 5874 5875 ~ImplicitlyDefinedFunctionScope() { 5876 S.PopExpressionEvaluationContext(); 5877 S.PopFunctionOrBlockScope(); 5878 } 5879 }; 5880} 5881 5882static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5883 CXXRecordDecl *D) { 5884 ASTContext &Context = Self.Context; 5885 QualType ClassType = Context.getTypeDeclType(D); 5886 DeclarationName ConstructorName 5887 = Context.DeclarationNames.getCXXConstructorName( 5888 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5889 5890 DeclContext::lookup_const_iterator Con, ConEnd; 5891 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5892 Con != ConEnd; ++Con) { 5893 // FIXME: In C++0x, a constructor template can be a default constructor. 5894 if (isa<FunctionTemplateDecl>(*Con)) 5895 continue; 5896 5897 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5898 if (Constructor->isDefaultConstructor()) 5899 return Constructor; 5900 } 5901 return 0; 5902} 5903 5904Sema::ImplicitExceptionSpecification 5905Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5906 // C++ [except.spec]p14: 5907 // An implicitly declared special member function (Clause 12) shall have an 5908 // exception-specification. [...] 5909 ImplicitExceptionSpecification ExceptSpec(Context); 5910 5911 // Direct base-class constructors. 5912 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5913 BEnd = ClassDecl->bases_end(); 5914 B != BEnd; ++B) { 5915 if (B->isVirtual()) // Handled below. 5916 continue; 5917 5918 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5919 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5920 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5921 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5922 else if (CXXConstructorDecl *Constructor 5923 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5924 ExceptSpec.CalledDecl(Constructor); 5925 } 5926 } 5927 5928 // Virtual base-class constructors. 5929 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5930 BEnd = ClassDecl->vbases_end(); 5931 B != BEnd; ++B) { 5932 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5933 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5934 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5935 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5936 else if (CXXConstructorDecl *Constructor 5937 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5938 ExceptSpec.CalledDecl(Constructor); 5939 } 5940 } 5941 5942 // Field constructors. 5943 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5944 FEnd = ClassDecl->field_end(); 5945 F != FEnd; ++F) { 5946 if (const RecordType *RecordTy 5947 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5948 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5949 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5950 ExceptSpec.CalledDecl( 5951 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5952 else if (CXXConstructorDecl *Constructor 5953 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5954 ExceptSpec.CalledDecl(Constructor); 5955 } 5956 } 5957 5958 return ExceptSpec; 5959} 5960 5961CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5962 CXXRecordDecl *ClassDecl) { 5963 // C++ [class.ctor]p5: 5964 // A default constructor for a class X is a constructor of class X 5965 // that can be called without an argument. If there is no 5966 // user-declared constructor for class X, a default constructor is 5967 // implicitly declared. An implicitly-declared default constructor 5968 // is an inline public member of its class. 5969 assert(!ClassDecl->hasUserDeclaredConstructor() && 5970 "Should not build implicit default constructor!"); 5971 5972 ImplicitExceptionSpecification Spec = 5973 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5974 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5975 5976 // Create the actual constructor declaration. 5977 CanQualType ClassType 5978 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5979 SourceLocation ClassLoc = ClassDecl->getLocation(); 5980 DeclarationName Name 5981 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5982 DeclarationNameInfo NameInfo(Name, ClassLoc); 5983 CXXConstructorDecl *DefaultCon 5984 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5985 Context.getFunctionType(Context.VoidTy, 5986 0, 0, EPI), 5987 /*TInfo=*/0, 5988 /*isExplicit=*/false, 5989 /*isInline=*/true, 5990 /*isImplicitlyDeclared=*/true); 5991 DefaultCon->setAccess(AS_public); 5992 DefaultCon->setDefaulted(); 5993 DefaultCon->setImplicit(); 5994 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5995 5996 // Note that we have declared this constructor. 5997 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5998 5999 if (Scope *S = getScopeForContext(ClassDecl)) 6000 PushOnScopeChains(DefaultCon, S, false); 6001 ClassDecl->addDecl(DefaultCon); 6002 6003 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6004 DefaultCon->setDeletedAsWritten(); 6005 6006 return DefaultCon; 6007} 6008 6009void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6010 CXXConstructorDecl *Constructor) { 6011 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6012 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 6013 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6014 6015 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6016 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6017 6018 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6019 DiagnosticErrorTrap Trap(Diags); 6020 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6021 Trap.hasErrorOccurred()) { 6022 Diag(CurrentLocation, diag::note_member_synthesized_at) 6023 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6024 Constructor->setInvalidDecl(); 6025 return; 6026 } 6027 6028 SourceLocation Loc = Constructor->getLocation(); 6029 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6030 6031 Constructor->setUsed(); 6032 MarkVTableUsed(CurrentLocation, ClassDecl); 6033 6034 if (ASTMutationListener *L = getASTMutationListener()) { 6035 L->CompletedImplicitDefinition(Constructor); 6036 } 6037} 6038 6039void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6040 // We start with an initial pass over the base classes to collect those that 6041 // inherit constructors from. If there are none, we can forgo all further 6042 // processing. 6043 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6044 BasesVector BasesToInheritFrom; 6045 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6046 BaseE = ClassDecl->bases_end(); 6047 BaseIt != BaseE; ++BaseIt) { 6048 if (BaseIt->getInheritConstructors()) { 6049 QualType Base = BaseIt->getType(); 6050 if (Base->isDependentType()) { 6051 // If we inherit constructors from anything that is dependent, just 6052 // abort processing altogether. We'll get another chance for the 6053 // instantiations. 6054 return; 6055 } 6056 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6057 } 6058 } 6059 if (BasesToInheritFrom.empty()) 6060 return; 6061 6062 // Now collect the constructors that we already have in the current class. 6063 // Those take precedence over inherited constructors. 6064 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6065 // unless there is a user-declared constructor with the same signature in 6066 // the class where the using-declaration appears. 6067 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6068 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6069 CtorE = ClassDecl->ctor_end(); 6070 CtorIt != CtorE; ++CtorIt) { 6071 ExistingConstructors.insert( 6072 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6073 } 6074 6075 Scope *S = getScopeForContext(ClassDecl); 6076 DeclarationName CreatedCtorName = 6077 Context.DeclarationNames.getCXXConstructorName( 6078 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6079 6080 // Now comes the true work. 6081 // First, we keep a map from constructor types to the base that introduced 6082 // them. Needed for finding conflicting constructors. We also keep the 6083 // actually inserted declarations in there, for pretty diagnostics. 6084 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6085 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6086 ConstructorToSourceMap InheritedConstructors; 6087 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6088 BaseE = BasesToInheritFrom.end(); 6089 BaseIt != BaseE; ++BaseIt) { 6090 const RecordType *Base = *BaseIt; 6091 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6092 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6093 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6094 CtorE = BaseDecl->ctor_end(); 6095 CtorIt != CtorE; ++CtorIt) { 6096 // Find the using declaration for inheriting this base's constructors. 6097 DeclarationName Name = 6098 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6099 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6100 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6101 SourceLocation UsingLoc = UD ? UD->getLocation() : 6102 ClassDecl->getLocation(); 6103 6104 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6105 // from the class X named in the using-declaration consists of actual 6106 // constructors and notional constructors that result from the 6107 // transformation of defaulted parameters as follows: 6108 // - all non-template default constructors of X, and 6109 // - for each non-template constructor of X that has at least one 6110 // parameter with a default argument, the set of constructors that 6111 // results from omitting any ellipsis parameter specification and 6112 // successively omitting parameters with a default argument from the 6113 // end of the parameter-type-list. 6114 CXXConstructorDecl *BaseCtor = *CtorIt; 6115 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6116 const FunctionProtoType *BaseCtorType = 6117 BaseCtor->getType()->getAs<FunctionProtoType>(); 6118 6119 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6120 maxParams = BaseCtor->getNumParams(); 6121 params <= maxParams; ++params) { 6122 // Skip default constructors. They're never inherited. 6123 if (params == 0) 6124 continue; 6125 // Skip copy and move constructors for the same reason. 6126 if (CanBeCopyOrMove && params == 1) 6127 continue; 6128 6129 // Build up a function type for this particular constructor. 6130 // FIXME: The working paper does not consider that the exception spec 6131 // for the inheriting constructor might be larger than that of the 6132 // source. This code doesn't yet, either. 6133 const Type *NewCtorType; 6134 if (params == maxParams) 6135 NewCtorType = BaseCtorType; 6136 else { 6137 llvm::SmallVector<QualType, 16> Args; 6138 for (unsigned i = 0; i < params; ++i) { 6139 Args.push_back(BaseCtorType->getArgType(i)); 6140 } 6141 FunctionProtoType::ExtProtoInfo ExtInfo = 6142 BaseCtorType->getExtProtoInfo(); 6143 ExtInfo.Variadic = false; 6144 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6145 Args.data(), params, ExtInfo) 6146 .getTypePtr(); 6147 } 6148 const Type *CanonicalNewCtorType = 6149 Context.getCanonicalType(NewCtorType); 6150 6151 // Now that we have the type, first check if the class already has a 6152 // constructor with this signature. 6153 if (ExistingConstructors.count(CanonicalNewCtorType)) 6154 continue; 6155 6156 // Then we check if we have already declared an inherited constructor 6157 // with this signature. 6158 std::pair<ConstructorToSourceMap::iterator, bool> result = 6159 InheritedConstructors.insert(std::make_pair( 6160 CanonicalNewCtorType, 6161 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6162 if (!result.second) { 6163 // Already in the map. If it came from a different class, that's an 6164 // error. Not if it's from the same. 6165 CanQualType PreviousBase = result.first->second.first; 6166 if (CanonicalBase != PreviousBase) { 6167 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6168 const CXXConstructorDecl *PrevBaseCtor = 6169 PrevCtor->getInheritedConstructor(); 6170 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6171 6172 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6173 Diag(BaseCtor->getLocation(), 6174 diag::note_using_decl_constructor_conflict_current_ctor); 6175 Diag(PrevBaseCtor->getLocation(), 6176 diag::note_using_decl_constructor_conflict_previous_ctor); 6177 Diag(PrevCtor->getLocation(), 6178 diag::note_using_decl_constructor_conflict_previous_using); 6179 } 6180 continue; 6181 } 6182 6183 // OK, we're there, now add the constructor. 6184 // C++0x [class.inhctor]p8: [...] that would be performed by a 6185 // user-writtern inline constructor [...] 6186 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6187 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6188 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6189 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6190 /*ImplicitlyDeclared=*/true); 6191 NewCtor->setAccess(BaseCtor->getAccess()); 6192 6193 // Build up the parameter decls and add them. 6194 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6195 for (unsigned i = 0; i < params; ++i) { 6196 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6197 UsingLoc, UsingLoc, 6198 /*IdentifierInfo=*/0, 6199 BaseCtorType->getArgType(i), 6200 /*TInfo=*/0, SC_None, 6201 SC_None, /*DefaultArg=*/0)); 6202 } 6203 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6204 NewCtor->setInheritedConstructor(BaseCtor); 6205 6206 PushOnScopeChains(NewCtor, S, false); 6207 ClassDecl->addDecl(NewCtor); 6208 result.first->second.second = NewCtor; 6209 } 6210 } 6211 } 6212} 6213 6214Sema::ImplicitExceptionSpecification 6215Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6216 // C++ [except.spec]p14: 6217 // An implicitly declared special member function (Clause 12) shall have 6218 // an exception-specification. 6219 ImplicitExceptionSpecification ExceptSpec(Context); 6220 6221 // Direct base-class destructors. 6222 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6223 BEnd = ClassDecl->bases_end(); 6224 B != BEnd; ++B) { 6225 if (B->isVirtual()) // Handled below. 6226 continue; 6227 6228 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6229 ExceptSpec.CalledDecl( 6230 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6231 } 6232 6233 // Virtual base-class destructors. 6234 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6235 BEnd = ClassDecl->vbases_end(); 6236 B != BEnd; ++B) { 6237 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6238 ExceptSpec.CalledDecl( 6239 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6240 } 6241 6242 // Field destructors. 6243 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6244 FEnd = ClassDecl->field_end(); 6245 F != FEnd; ++F) { 6246 if (const RecordType *RecordTy 6247 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6248 ExceptSpec.CalledDecl( 6249 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6250 } 6251 6252 return ExceptSpec; 6253} 6254 6255CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6256 // C++ [class.dtor]p2: 6257 // If a class has no user-declared destructor, a destructor is 6258 // declared implicitly. An implicitly-declared destructor is an 6259 // inline public member of its class. 6260 6261 ImplicitExceptionSpecification Spec = 6262 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6263 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6264 6265 // Create the actual destructor declaration. 6266 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6267 6268 CanQualType ClassType 6269 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6270 SourceLocation ClassLoc = ClassDecl->getLocation(); 6271 DeclarationName Name 6272 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6273 DeclarationNameInfo NameInfo(Name, ClassLoc); 6274 CXXDestructorDecl *Destructor 6275 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6276 /*isInline=*/true, 6277 /*isImplicitlyDeclared=*/true); 6278 Destructor->setAccess(AS_public); 6279 Destructor->setDefaulted(); 6280 Destructor->setImplicit(); 6281 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6282 6283 // Note that we have declared this destructor. 6284 ++ASTContext::NumImplicitDestructorsDeclared; 6285 6286 // Introduce this destructor into its scope. 6287 if (Scope *S = getScopeForContext(ClassDecl)) 6288 PushOnScopeChains(Destructor, S, false); 6289 ClassDecl->addDecl(Destructor); 6290 6291 // This could be uniqued if it ever proves significant. 6292 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6293 6294 if (ShouldDeleteDestructor(Destructor)) 6295 Destructor->setDeletedAsWritten(); 6296 6297 AddOverriddenMethods(ClassDecl, Destructor); 6298 6299 return Destructor; 6300} 6301 6302void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6303 CXXDestructorDecl *Destructor) { 6304 assert((Destructor->isDefaulted() && !Destructor->isUsed(false)) && 6305 "DefineImplicitDestructor - call it for implicit default dtor"); 6306 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6307 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6308 6309 if (Destructor->isInvalidDecl()) 6310 return; 6311 6312 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6313 6314 DiagnosticErrorTrap Trap(Diags); 6315 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6316 Destructor->getParent()); 6317 6318 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6319 Diag(CurrentLocation, diag::note_member_synthesized_at) 6320 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6321 6322 Destructor->setInvalidDecl(); 6323 return; 6324 } 6325 6326 SourceLocation Loc = Destructor->getLocation(); 6327 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6328 6329 Destructor->setUsed(); 6330 MarkVTableUsed(CurrentLocation, ClassDecl); 6331 6332 if (ASTMutationListener *L = getASTMutationListener()) { 6333 L->CompletedImplicitDefinition(Destructor); 6334 } 6335} 6336 6337void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6338 CXXDestructorDecl *destructor) { 6339 // C++11 [class.dtor]p3: 6340 // A declaration of a destructor that does not have an exception- 6341 // specification is implicitly considered to have the same exception- 6342 // specification as an implicit declaration. 6343 const FunctionProtoType *dtorType = destructor->getType()-> 6344 getAs<FunctionProtoType>(); 6345 if (dtorType->hasExceptionSpec()) 6346 return; 6347 6348 ImplicitExceptionSpecification exceptSpec = 6349 ComputeDefaultedDtorExceptionSpec(classDecl); 6350 6351 // Replace the destructor's type. 6352 FunctionProtoType::ExtProtoInfo epi; 6353 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6354 epi.NumExceptions = exceptSpec.size(); 6355 epi.Exceptions = exceptSpec.data(); 6356 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6357 6358 destructor->setType(ty); 6359 6360 // FIXME: If the destructor has a body that could throw, and the newly created 6361 // spec doesn't allow exceptions, we should emit a warning, because this 6362 // change in behavior can break conforming C++03 programs at runtime. 6363 // However, we don't have a body yet, so it needs to be done somewhere else. 6364} 6365 6366/// \brief Builds a statement that copies the given entity from \p From to 6367/// \c To. 6368/// 6369/// This routine is used to copy the members of a class with an 6370/// implicitly-declared copy assignment operator. When the entities being 6371/// copied are arrays, this routine builds for loops to copy them. 6372/// 6373/// \param S The Sema object used for type-checking. 6374/// 6375/// \param Loc The location where the implicit copy is being generated. 6376/// 6377/// \param T The type of the expressions being copied. Both expressions must 6378/// have this type. 6379/// 6380/// \param To The expression we are copying to. 6381/// 6382/// \param From The expression we are copying from. 6383/// 6384/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6385/// Otherwise, it's a non-static member subobject. 6386/// 6387/// \param Depth Internal parameter recording the depth of the recursion. 6388/// 6389/// \returns A statement or a loop that copies the expressions. 6390static StmtResult 6391BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6392 Expr *To, Expr *From, 6393 bool CopyingBaseSubobject, unsigned Depth = 0) { 6394 // C++0x [class.copy]p30: 6395 // Each subobject is assigned in the manner appropriate to its type: 6396 // 6397 // - if the subobject is of class type, the copy assignment operator 6398 // for the class is used (as if by explicit qualification; that is, 6399 // ignoring any possible virtual overriding functions in more derived 6400 // classes); 6401 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6402 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6403 6404 // Look for operator=. 6405 DeclarationName Name 6406 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6407 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6408 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6409 6410 // Filter out any result that isn't a copy-assignment operator. 6411 LookupResult::Filter F = OpLookup.makeFilter(); 6412 while (F.hasNext()) { 6413 NamedDecl *D = F.next(); 6414 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6415 if (Method->isCopyAssignmentOperator()) 6416 continue; 6417 6418 F.erase(); 6419 } 6420 F.done(); 6421 6422 // Suppress the protected check (C++ [class.protected]) for each of the 6423 // assignment operators we found. This strange dance is required when 6424 // we're assigning via a base classes's copy-assignment operator. To 6425 // ensure that we're getting the right base class subobject (without 6426 // ambiguities), we need to cast "this" to that subobject type; to 6427 // ensure that we don't go through the virtual call mechanism, we need 6428 // to qualify the operator= name with the base class (see below). However, 6429 // this means that if the base class has a protected copy assignment 6430 // operator, the protected member access check will fail. So, we 6431 // rewrite "protected" access to "public" access in this case, since we 6432 // know by construction that we're calling from a derived class. 6433 if (CopyingBaseSubobject) { 6434 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6435 L != LEnd; ++L) { 6436 if (L.getAccess() == AS_protected) 6437 L.setAccess(AS_public); 6438 } 6439 } 6440 6441 // Create the nested-name-specifier that will be used to qualify the 6442 // reference to operator=; this is required to suppress the virtual 6443 // call mechanism. 6444 CXXScopeSpec SS; 6445 SS.MakeTrivial(S.Context, 6446 NestedNameSpecifier::Create(S.Context, 0, false, 6447 T.getTypePtr()), 6448 Loc); 6449 6450 // Create the reference to operator=. 6451 ExprResult OpEqualRef 6452 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6453 /*FirstQualifierInScope=*/0, OpLookup, 6454 /*TemplateArgs=*/0, 6455 /*SuppressQualifierCheck=*/true); 6456 if (OpEqualRef.isInvalid()) 6457 return StmtError(); 6458 6459 // Build the call to the assignment operator. 6460 6461 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6462 OpEqualRef.takeAs<Expr>(), 6463 Loc, &From, 1, Loc); 6464 if (Call.isInvalid()) 6465 return StmtError(); 6466 6467 return S.Owned(Call.takeAs<Stmt>()); 6468 } 6469 6470 // - if the subobject is of scalar type, the built-in assignment 6471 // operator is used. 6472 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6473 if (!ArrayTy) { 6474 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6475 if (Assignment.isInvalid()) 6476 return StmtError(); 6477 6478 return S.Owned(Assignment.takeAs<Stmt>()); 6479 } 6480 6481 // - if the subobject is an array, each element is assigned, in the 6482 // manner appropriate to the element type; 6483 6484 // Construct a loop over the array bounds, e.g., 6485 // 6486 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6487 // 6488 // that will copy each of the array elements. 6489 QualType SizeType = S.Context.getSizeType(); 6490 6491 // Create the iteration variable. 6492 IdentifierInfo *IterationVarName = 0; 6493 { 6494 llvm::SmallString<8> Str; 6495 llvm::raw_svector_ostream OS(Str); 6496 OS << "__i" << Depth; 6497 IterationVarName = &S.Context.Idents.get(OS.str()); 6498 } 6499 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6500 IterationVarName, SizeType, 6501 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6502 SC_None, SC_None); 6503 6504 // Initialize the iteration variable to zero. 6505 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6506 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6507 6508 // Create a reference to the iteration variable; we'll use this several 6509 // times throughout. 6510 Expr *IterationVarRef 6511 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6512 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6513 6514 // Create the DeclStmt that holds the iteration variable. 6515 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6516 6517 // Create the comparison against the array bound. 6518 llvm::APInt Upper 6519 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6520 Expr *Comparison 6521 = new (S.Context) BinaryOperator(IterationVarRef, 6522 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6523 BO_NE, S.Context.BoolTy, 6524 VK_RValue, OK_Ordinary, Loc); 6525 6526 // Create the pre-increment of the iteration variable. 6527 Expr *Increment 6528 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6529 VK_LValue, OK_Ordinary, Loc); 6530 6531 // Subscript the "from" and "to" expressions with the iteration variable. 6532 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6533 IterationVarRef, Loc)); 6534 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6535 IterationVarRef, Loc)); 6536 6537 // Build the copy for an individual element of the array. 6538 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6539 To, From, CopyingBaseSubobject, 6540 Depth + 1); 6541 if (Copy.isInvalid()) 6542 return StmtError(); 6543 6544 // Construct the loop that copies all elements of this array. 6545 return S.ActOnForStmt(Loc, Loc, InitStmt, 6546 S.MakeFullExpr(Comparison), 6547 0, S.MakeFullExpr(Increment), 6548 Loc, Copy.take()); 6549} 6550 6551/// \brief Determine whether the given class has a copy assignment operator 6552/// that accepts a const-qualified argument. 6553static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6554 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6555 6556 if (!Class->hasDeclaredCopyAssignment()) 6557 S.DeclareImplicitCopyAssignment(Class); 6558 6559 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6560 DeclarationName OpName 6561 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6562 6563 DeclContext::lookup_const_iterator Op, OpEnd; 6564 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6565 // C++ [class.copy]p9: 6566 // A user-declared copy assignment operator is a non-static non-template 6567 // member function of class X with exactly one parameter of type X, X&, 6568 // const X&, volatile X& or const volatile X&. 6569 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6570 if (!Method) 6571 continue; 6572 6573 if (Method->isStatic()) 6574 continue; 6575 if (Method->getPrimaryTemplate()) 6576 continue; 6577 const FunctionProtoType *FnType = 6578 Method->getType()->getAs<FunctionProtoType>(); 6579 assert(FnType && "Overloaded operator has no prototype."); 6580 // Don't assert on this; an invalid decl might have been left in the AST. 6581 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6582 continue; 6583 bool AcceptsConst = true; 6584 QualType ArgType = FnType->getArgType(0); 6585 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6586 ArgType = Ref->getPointeeType(); 6587 // Is it a non-const lvalue reference? 6588 if (!ArgType.isConstQualified()) 6589 AcceptsConst = false; 6590 } 6591 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6592 continue; 6593 6594 // We have a single argument of type cv X or cv X&, i.e. we've found the 6595 // copy assignment operator. Return whether it accepts const arguments. 6596 return AcceptsConst; 6597 } 6598 assert(Class->isInvalidDecl() && 6599 "No copy assignment operator declared in valid code."); 6600 return false; 6601} 6602 6603std::pair<Sema::ImplicitExceptionSpecification, bool> 6604Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6605 CXXRecordDecl *ClassDecl) { 6606 // C++ [class.copy]p10: 6607 // If the class definition does not explicitly declare a copy 6608 // assignment operator, one is declared implicitly. 6609 // The implicitly-defined copy assignment operator for a class X 6610 // will have the form 6611 // 6612 // X& X::operator=(const X&) 6613 // 6614 // if 6615 bool HasConstCopyAssignment = true; 6616 6617 // -- each direct base class B of X has a copy assignment operator 6618 // whose parameter is of type const B&, const volatile B& or B, 6619 // and 6620 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6621 BaseEnd = ClassDecl->bases_end(); 6622 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6623 assert(!Base->getType()->isDependentType() && 6624 "Cannot generate implicit members for class with dependent bases."); 6625 const CXXRecordDecl *BaseClassDecl 6626 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6627 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6628 } 6629 6630 // -- for all the nonstatic data members of X that are of a class 6631 // type M (or array thereof), each such class type has a copy 6632 // assignment operator whose parameter is of type const M&, 6633 // const volatile M& or M. 6634 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6635 FieldEnd = ClassDecl->field_end(); 6636 HasConstCopyAssignment && Field != FieldEnd; 6637 ++Field) { 6638 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6639 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6640 const CXXRecordDecl *FieldClassDecl 6641 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6642 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6643 } 6644 } 6645 6646 // Otherwise, the implicitly declared copy assignment operator will 6647 // have the form 6648 // 6649 // X& X::operator=(X&) 6650 6651 // C++ [except.spec]p14: 6652 // An implicitly declared special member function (Clause 12) shall have an 6653 // exception-specification. [...] 6654 ImplicitExceptionSpecification ExceptSpec(Context); 6655 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6656 BaseEnd = ClassDecl->bases_end(); 6657 Base != BaseEnd; ++Base) { 6658 CXXRecordDecl *BaseClassDecl 6659 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6660 6661 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6662 DeclareImplicitCopyAssignment(BaseClassDecl); 6663 6664 if (CXXMethodDecl *CopyAssign 6665 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6666 ExceptSpec.CalledDecl(CopyAssign); 6667 } 6668 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6669 FieldEnd = ClassDecl->field_end(); 6670 Field != FieldEnd; 6671 ++Field) { 6672 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6673 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6674 CXXRecordDecl *FieldClassDecl 6675 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6676 6677 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6678 DeclareImplicitCopyAssignment(FieldClassDecl); 6679 6680 if (CXXMethodDecl *CopyAssign 6681 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6682 ExceptSpec.CalledDecl(CopyAssign); 6683 } 6684 } 6685 6686 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6687} 6688 6689CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6690 // Note: The following rules are largely analoguous to the copy 6691 // constructor rules. Note that virtual bases are not taken into account 6692 // for determining the argument type of the operator. Note also that 6693 // operators taking an object instead of a reference are allowed. 6694 6695 ImplicitExceptionSpecification Spec(Context); 6696 bool Const; 6697 llvm::tie(Spec, Const) = 6698 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6699 6700 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6701 QualType RetType = Context.getLValueReferenceType(ArgType); 6702 if (Const) 6703 ArgType = ArgType.withConst(); 6704 ArgType = Context.getLValueReferenceType(ArgType); 6705 6706 // An implicitly-declared copy assignment operator is an inline public 6707 // member of its class. 6708 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6709 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6710 SourceLocation ClassLoc = ClassDecl->getLocation(); 6711 DeclarationNameInfo NameInfo(Name, ClassLoc); 6712 CXXMethodDecl *CopyAssignment 6713 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6714 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6715 /*TInfo=*/0, /*isStatic=*/false, 6716 /*StorageClassAsWritten=*/SC_None, 6717 /*isInline=*/true, 6718 SourceLocation()); 6719 CopyAssignment->setAccess(AS_public); 6720 CopyAssignment->setDefaulted(); 6721 CopyAssignment->setImplicit(); 6722 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6723 6724 // Add the parameter to the operator. 6725 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6726 ClassLoc, ClassLoc, /*Id=*/0, 6727 ArgType, /*TInfo=*/0, 6728 SC_None, 6729 SC_None, 0); 6730 CopyAssignment->setParams(&FromParam, 1); 6731 6732 // Note that we have added this copy-assignment operator. 6733 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6734 6735 if (Scope *S = getScopeForContext(ClassDecl)) 6736 PushOnScopeChains(CopyAssignment, S, false); 6737 ClassDecl->addDecl(CopyAssignment); 6738 6739 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6740 CopyAssignment->setDeletedAsWritten(); 6741 6742 AddOverriddenMethods(ClassDecl, CopyAssignment); 6743 return CopyAssignment; 6744} 6745 6746void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6747 CXXMethodDecl *CopyAssignOperator) { 6748 assert((CopyAssignOperator->isDefaulted() && 6749 CopyAssignOperator->isOverloadedOperator() && 6750 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6751 !CopyAssignOperator->isUsed(false)) && 6752 "DefineImplicitCopyAssignment called for wrong function"); 6753 6754 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6755 6756 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6757 CopyAssignOperator->setInvalidDecl(); 6758 return; 6759 } 6760 6761 CopyAssignOperator->setUsed(); 6762 6763 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6764 DiagnosticErrorTrap Trap(Diags); 6765 6766 // C++0x [class.copy]p30: 6767 // The implicitly-defined or explicitly-defaulted copy assignment operator 6768 // for a non-union class X performs memberwise copy assignment of its 6769 // subobjects. The direct base classes of X are assigned first, in the 6770 // order of their declaration in the base-specifier-list, and then the 6771 // immediate non-static data members of X are assigned, in the order in 6772 // which they were declared in the class definition. 6773 6774 // The statements that form the synthesized function body. 6775 ASTOwningVector<Stmt*> Statements(*this); 6776 6777 // The parameter for the "other" object, which we are copying from. 6778 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6779 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6780 QualType OtherRefType = Other->getType(); 6781 if (const LValueReferenceType *OtherRef 6782 = OtherRefType->getAs<LValueReferenceType>()) { 6783 OtherRefType = OtherRef->getPointeeType(); 6784 OtherQuals = OtherRefType.getQualifiers(); 6785 } 6786 6787 // Our location for everything implicitly-generated. 6788 SourceLocation Loc = CopyAssignOperator->getLocation(); 6789 6790 // Construct a reference to the "other" object. We'll be using this 6791 // throughout the generated ASTs. 6792 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6793 assert(OtherRef && "Reference to parameter cannot fail!"); 6794 6795 // Construct the "this" pointer. We'll be using this throughout the generated 6796 // ASTs. 6797 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6798 assert(This && "Reference to this cannot fail!"); 6799 6800 // Assign base classes. 6801 bool Invalid = false; 6802 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6803 E = ClassDecl->bases_end(); Base != E; ++Base) { 6804 // Form the assignment: 6805 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6806 QualType BaseType = Base->getType().getUnqualifiedType(); 6807 if (!BaseType->isRecordType()) { 6808 Invalid = true; 6809 continue; 6810 } 6811 6812 CXXCastPath BasePath; 6813 BasePath.push_back(Base); 6814 6815 // Construct the "from" expression, which is an implicit cast to the 6816 // appropriately-qualified base type. 6817 Expr *From = OtherRef; 6818 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6819 CK_UncheckedDerivedToBase, 6820 VK_LValue, &BasePath).take(); 6821 6822 // Dereference "this". 6823 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6824 6825 // Implicitly cast "this" to the appropriately-qualified base type. 6826 To = ImpCastExprToType(To.take(), 6827 Context.getCVRQualifiedType(BaseType, 6828 CopyAssignOperator->getTypeQualifiers()), 6829 CK_UncheckedDerivedToBase, 6830 VK_LValue, &BasePath); 6831 6832 // Build the copy. 6833 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6834 To.get(), From, 6835 /*CopyingBaseSubobject=*/true); 6836 if (Copy.isInvalid()) { 6837 Diag(CurrentLocation, diag::note_member_synthesized_at) 6838 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6839 CopyAssignOperator->setInvalidDecl(); 6840 return; 6841 } 6842 6843 // Success! Record the copy. 6844 Statements.push_back(Copy.takeAs<Expr>()); 6845 } 6846 6847 // \brief Reference to the __builtin_memcpy function. 6848 Expr *BuiltinMemCpyRef = 0; 6849 // \brief Reference to the __builtin_objc_memmove_collectable function. 6850 Expr *CollectableMemCpyRef = 0; 6851 6852 // Assign non-static members. 6853 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6854 FieldEnd = ClassDecl->field_end(); 6855 Field != FieldEnd; ++Field) { 6856 // Check for members of reference type; we can't copy those. 6857 if (Field->getType()->isReferenceType()) { 6858 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6859 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6860 Diag(Field->getLocation(), diag::note_declared_at); 6861 Diag(CurrentLocation, diag::note_member_synthesized_at) 6862 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6863 Invalid = true; 6864 continue; 6865 } 6866 6867 // Check for members of const-qualified, non-class type. 6868 QualType BaseType = Context.getBaseElementType(Field->getType()); 6869 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6870 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6871 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6872 Diag(Field->getLocation(), diag::note_declared_at); 6873 Diag(CurrentLocation, diag::note_member_synthesized_at) 6874 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6875 Invalid = true; 6876 continue; 6877 } 6878 6879 QualType FieldType = Field->getType().getNonReferenceType(); 6880 if (FieldType->isIncompleteArrayType()) { 6881 assert(ClassDecl->hasFlexibleArrayMember() && 6882 "Incomplete array type is not valid"); 6883 continue; 6884 } 6885 6886 // Build references to the field in the object we're copying from and to. 6887 CXXScopeSpec SS; // Intentionally empty 6888 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6889 LookupMemberName); 6890 MemberLookup.addDecl(*Field); 6891 MemberLookup.resolveKind(); 6892 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6893 Loc, /*IsArrow=*/false, 6894 SS, 0, MemberLookup, 0); 6895 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6896 Loc, /*IsArrow=*/true, 6897 SS, 0, MemberLookup, 0); 6898 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6899 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6900 6901 // If the field should be copied with __builtin_memcpy rather than via 6902 // explicit assignments, do so. This optimization only applies for arrays 6903 // of scalars and arrays of class type with trivial copy-assignment 6904 // operators. 6905 if (FieldType->isArrayType() && 6906 (!BaseType->isRecordType() || 6907 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6908 ->hasTrivialCopyAssignment())) { 6909 // Compute the size of the memory buffer to be copied. 6910 QualType SizeType = Context.getSizeType(); 6911 llvm::APInt Size(Context.getTypeSize(SizeType), 6912 Context.getTypeSizeInChars(BaseType).getQuantity()); 6913 for (const ConstantArrayType *Array 6914 = Context.getAsConstantArrayType(FieldType); 6915 Array; 6916 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6917 llvm::APInt ArraySize 6918 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6919 Size *= ArraySize; 6920 } 6921 6922 // Take the address of the field references for "from" and "to". 6923 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6924 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6925 6926 bool NeedsCollectableMemCpy = 6927 (BaseType->isRecordType() && 6928 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6929 6930 if (NeedsCollectableMemCpy) { 6931 if (!CollectableMemCpyRef) { 6932 // Create a reference to the __builtin_objc_memmove_collectable function. 6933 LookupResult R(*this, 6934 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6935 Loc, LookupOrdinaryName); 6936 LookupName(R, TUScope, true); 6937 6938 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6939 if (!CollectableMemCpy) { 6940 // Something went horribly wrong earlier, and we will have 6941 // complained about it. 6942 Invalid = true; 6943 continue; 6944 } 6945 6946 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6947 CollectableMemCpy->getType(), 6948 VK_LValue, Loc, 0).take(); 6949 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6950 } 6951 } 6952 // Create a reference to the __builtin_memcpy builtin function. 6953 else if (!BuiltinMemCpyRef) { 6954 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6955 LookupOrdinaryName); 6956 LookupName(R, TUScope, true); 6957 6958 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6959 if (!BuiltinMemCpy) { 6960 // Something went horribly wrong earlier, and we will have complained 6961 // about it. 6962 Invalid = true; 6963 continue; 6964 } 6965 6966 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6967 BuiltinMemCpy->getType(), 6968 VK_LValue, Loc, 0).take(); 6969 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6970 } 6971 6972 ASTOwningVector<Expr*> CallArgs(*this); 6973 CallArgs.push_back(To.takeAs<Expr>()); 6974 CallArgs.push_back(From.takeAs<Expr>()); 6975 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6976 ExprResult Call = ExprError(); 6977 if (NeedsCollectableMemCpy) 6978 Call = ActOnCallExpr(/*Scope=*/0, 6979 CollectableMemCpyRef, 6980 Loc, move_arg(CallArgs), 6981 Loc); 6982 else 6983 Call = ActOnCallExpr(/*Scope=*/0, 6984 BuiltinMemCpyRef, 6985 Loc, move_arg(CallArgs), 6986 Loc); 6987 6988 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6989 Statements.push_back(Call.takeAs<Expr>()); 6990 continue; 6991 } 6992 6993 // Build the copy of this field. 6994 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6995 To.get(), From.get(), 6996 /*CopyingBaseSubobject=*/false); 6997 if (Copy.isInvalid()) { 6998 Diag(CurrentLocation, diag::note_member_synthesized_at) 6999 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7000 CopyAssignOperator->setInvalidDecl(); 7001 return; 7002 } 7003 7004 // Success! Record the copy. 7005 Statements.push_back(Copy.takeAs<Stmt>()); 7006 } 7007 7008 if (!Invalid) { 7009 // Add a "return *this;" 7010 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7011 7012 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7013 if (Return.isInvalid()) 7014 Invalid = true; 7015 else { 7016 Statements.push_back(Return.takeAs<Stmt>()); 7017 7018 if (Trap.hasErrorOccurred()) { 7019 Diag(CurrentLocation, diag::note_member_synthesized_at) 7020 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7021 Invalid = true; 7022 } 7023 } 7024 } 7025 7026 if (Invalid) { 7027 CopyAssignOperator->setInvalidDecl(); 7028 return; 7029 } 7030 7031 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7032 /*isStmtExpr=*/false); 7033 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7034 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7035 7036 if (ASTMutationListener *L = getASTMutationListener()) { 7037 L->CompletedImplicitDefinition(CopyAssignOperator); 7038 } 7039} 7040 7041std::pair<Sema::ImplicitExceptionSpecification, bool> 7042Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7043 // C++ [class.copy]p5: 7044 // The implicitly-declared copy constructor for a class X will 7045 // have the form 7046 // 7047 // X::X(const X&) 7048 // 7049 // if 7050 bool HasConstCopyConstructor = true; 7051 7052 // -- each direct or virtual base class B of X has a copy 7053 // constructor whose first parameter is of type const B& or 7054 // const volatile B&, and 7055 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7056 BaseEnd = ClassDecl->bases_end(); 7057 HasConstCopyConstructor && Base != BaseEnd; 7058 ++Base) { 7059 // Virtual bases are handled below. 7060 if (Base->isVirtual()) 7061 continue; 7062 7063 CXXRecordDecl *BaseClassDecl 7064 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7065 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7066 DeclareImplicitCopyConstructor(BaseClassDecl); 7067 7068 HasConstCopyConstructor 7069 = BaseClassDecl->hasConstCopyConstructor(Context); 7070 } 7071 7072 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7073 BaseEnd = ClassDecl->vbases_end(); 7074 HasConstCopyConstructor && Base != BaseEnd; 7075 ++Base) { 7076 CXXRecordDecl *BaseClassDecl 7077 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7078 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7079 DeclareImplicitCopyConstructor(BaseClassDecl); 7080 7081 HasConstCopyConstructor 7082 = BaseClassDecl->hasConstCopyConstructor(Context); 7083 } 7084 7085 // -- for all the nonstatic data members of X that are of a 7086 // class type M (or array thereof), each such class type 7087 // has a copy constructor whose first parameter is of type 7088 // const M& or const volatile M&. 7089 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7090 FieldEnd = ClassDecl->field_end(); 7091 HasConstCopyConstructor && Field != FieldEnd; 7092 ++Field) { 7093 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7094 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7095 CXXRecordDecl *FieldClassDecl 7096 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7097 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7098 DeclareImplicitCopyConstructor(FieldClassDecl); 7099 7100 HasConstCopyConstructor 7101 = FieldClassDecl->hasConstCopyConstructor(Context); 7102 } 7103 } 7104 // Otherwise, the implicitly declared copy constructor will have 7105 // the form 7106 // 7107 // X::X(X&) 7108 7109 // C++ [except.spec]p14: 7110 // An implicitly declared special member function (Clause 12) shall have an 7111 // exception-specification. [...] 7112 ImplicitExceptionSpecification ExceptSpec(Context); 7113 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7114 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7115 BaseEnd = ClassDecl->bases_end(); 7116 Base != BaseEnd; 7117 ++Base) { 7118 // Virtual bases are handled below. 7119 if (Base->isVirtual()) 7120 continue; 7121 7122 CXXRecordDecl *BaseClassDecl 7123 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7124 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7125 DeclareImplicitCopyConstructor(BaseClassDecl); 7126 7127 if (CXXConstructorDecl *CopyConstructor 7128 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7129 ExceptSpec.CalledDecl(CopyConstructor); 7130 } 7131 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7132 BaseEnd = ClassDecl->vbases_end(); 7133 Base != BaseEnd; 7134 ++Base) { 7135 CXXRecordDecl *BaseClassDecl 7136 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7137 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7138 DeclareImplicitCopyConstructor(BaseClassDecl); 7139 7140 if (CXXConstructorDecl *CopyConstructor 7141 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7142 ExceptSpec.CalledDecl(CopyConstructor); 7143 } 7144 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7145 FieldEnd = ClassDecl->field_end(); 7146 Field != FieldEnd; 7147 ++Field) { 7148 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7149 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7150 CXXRecordDecl *FieldClassDecl 7151 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7152 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7153 DeclareImplicitCopyConstructor(FieldClassDecl); 7154 7155 if (CXXConstructorDecl *CopyConstructor 7156 = FieldClassDecl->getCopyConstructor(Context, Quals)) 7157 ExceptSpec.CalledDecl(CopyConstructor); 7158 } 7159 } 7160 7161 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7162} 7163 7164CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7165 CXXRecordDecl *ClassDecl) { 7166 // C++ [class.copy]p4: 7167 // If the class definition does not explicitly declare a copy 7168 // constructor, one is declared implicitly. 7169 7170 ImplicitExceptionSpecification Spec(Context); 7171 bool Const; 7172 llvm::tie(Spec, Const) = 7173 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7174 7175 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7176 QualType ArgType = ClassType; 7177 if (Const) 7178 ArgType = ArgType.withConst(); 7179 ArgType = Context.getLValueReferenceType(ArgType); 7180 7181 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7182 7183 DeclarationName Name 7184 = Context.DeclarationNames.getCXXConstructorName( 7185 Context.getCanonicalType(ClassType)); 7186 SourceLocation ClassLoc = ClassDecl->getLocation(); 7187 DeclarationNameInfo NameInfo(Name, ClassLoc); 7188 7189 // An implicitly-declared copy constructor is an inline public 7190 // member of its class. 7191 CXXConstructorDecl *CopyConstructor 7192 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7193 Context.getFunctionType(Context.VoidTy, 7194 &ArgType, 1, EPI), 7195 /*TInfo=*/0, 7196 /*isExplicit=*/false, 7197 /*isInline=*/true, 7198 /*isImplicitlyDeclared=*/true); 7199 CopyConstructor->setAccess(AS_public); 7200 CopyConstructor->setDefaulted(); 7201 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7202 7203 // Note that we have declared this constructor. 7204 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7205 7206 // Add the parameter to the constructor. 7207 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7208 ClassLoc, ClassLoc, 7209 /*IdentifierInfo=*/0, 7210 ArgType, /*TInfo=*/0, 7211 SC_None, 7212 SC_None, 0); 7213 CopyConstructor->setParams(&FromParam, 1); 7214 7215 if (Scope *S = getScopeForContext(ClassDecl)) 7216 PushOnScopeChains(CopyConstructor, S, false); 7217 ClassDecl->addDecl(CopyConstructor); 7218 7219 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7220 CopyConstructor->setDeletedAsWritten(); 7221 7222 return CopyConstructor; 7223} 7224 7225void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7226 CXXConstructorDecl *CopyConstructor) { 7227 assert((CopyConstructor->isDefaulted() && 7228 CopyConstructor->isCopyConstructor() && 7229 !CopyConstructor->isUsed(false)) && 7230 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7231 7232 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7233 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7234 7235 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7236 DiagnosticErrorTrap Trap(Diags); 7237 7238 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7239 Trap.hasErrorOccurred()) { 7240 Diag(CurrentLocation, diag::note_member_synthesized_at) 7241 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7242 CopyConstructor->setInvalidDecl(); 7243 } else { 7244 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7245 CopyConstructor->getLocation(), 7246 MultiStmtArg(*this, 0, 0), 7247 /*isStmtExpr=*/false) 7248 .takeAs<Stmt>()); 7249 } 7250 7251 CopyConstructor->setUsed(); 7252 7253 if (ASTMutationListener *L = getASTMutationListener()) { 7254 L->CompletedImplicitDefinition(CopyConstructor); 7255 } 7256} 7257 7258ExprResult 7259Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7260 CXXConstructorDecl *Constructor, 7261 MultiExprArg ExprArgs, 7262 bool RequiresZeroInit, 7263 unsigned ConstructKind, 7264 SourceRange ParenRange) { 7265 bool Elidable = false; 7266 7267 // C++0x [class.copy]p34: 7268 // When certain criteria are met, an implementation is allowed to 7269 // omit the copy/move construction of a class object, even if the 7270 // copy/move constructor and/or destructor for the object have 7271 // side effects. [...] 7272 // - when a temporary class object that has not been bound to a 7273 // reference (12.2) would be copied/moved to a class object 7274 // with the same cv-unqualified type, the copy/move operation 7275 // can be omitted by constructing the temporary object 7276 // directly into the target of the omitted copy/move 7277 if (ConstructKind == CXXConstructExpr::CK_Complete && 7278 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7279 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7280 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7281 } 7282 7283 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7284 Elidable, move(ExprArgs), RequiresZeroInit, 7285 ConstructKind, ParenRange); 7286} 7287 7288/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7289/// including handling of its default argument expressions. 7290ExprResult 7291Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7292 CXXConstructorDecl *Constructor, bool Elidable, 7293 MultiExprArg ExprArgs, 7294 bool RequiresZeroInit, 7295 unsigned ConstructKind, 7296 SourceRange ParenRange) { 7297 unsigned NumExprs = ExprArgs.size(); 7298 Expr **Exprs = (Expr **)ExprArgs.release(); 7299 7300 for (specific_attr_iterator<NonNullAttr> 7301 i = Constructor->specific_attr_begin<NonNullAttr>(), 7302 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7303 const NonNullAttr *NonNull = *i; 7304 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7305 } 7306 7307 MarkDeclarationReferenced(ConstructLoc, Constructor); 7308 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7309 Constructor, Elidable, Exprs, NumExprs, 7310 RequiresZeroInit, 7311 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7312 ParenRange)); 7313} 7314 7315bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7316 CXXConstructorDecl *Constructor, 7317 MultiExprArg Exprs) { 7318 // FIXME: Provide the correct paren SourceRange when available. 7319 ExprResult TempResult = 7320 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7321 move(Exprs), false, CXXConstructExpr::CK_Complete, 7322 SourceRange()); 7323 if (TempResult.isInvalid()) 7324 return true; 7325 7326 Expr *Temp = TempResult.takeAs<Expr>(); 7327 CheckImplicitConversions(Temp, VD->getLocation()); 7328 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7329 Temp = MaybeCreateExprWithCleanups(Temp); 7330 VD->setInit(Temp); 7331 7332 return false; 7333} 7334 7335void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7336 if (VD->isInvalidDecl()) return; 7337 7338 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7339 if (ClassDecl->isInvalidDecl()) return; 7340 if (ClassDecl->hasTrivialDestructor()) return; 7341 if (ClassDecl->isDependentContext()) return; 7342 7343 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7344 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7345 CheckDestructorAccess(VD->getLocation(), Destructor, 7346 PDiag(diag::err_access_dtor_var) 7347 << VD->getDeclName() 7348 << VD->getType()); 7349 7350 if (!VD->hasGlobalStorage()) return; 7351 7352 // Emit warning for non-trivial dtor in global scope (a real global, 7353 // class-static, function-static). 7354 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7355 7356 // TODO: this should be re-enabled for static locals by !CXAAtExit 7357 if (!VD->isStaticLocal()) 7358 Diag(VD->getLocation(), diag::warn_global_destructor); 7359} 7360 7361/// AddCXXDirectInitializerToDecl - This action is called immediately after 7362/// ActOnDeclarator, when a C++ direct initializer is present. 7363/// e.g: "int x(1);" 7364void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7365 SourceLocation LParenLoc, 7366 MultiExprArg Exprs, 7367 SourceLocation RParenLoc, 7368 bool TypeMayContainAuto) { 7369 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7370 7371 // If there is no declaration, there was an error parsing it. Just ignore 7372 // the initializer. 7373 if (RealDecl == 0) 7374 return; 7375 7376 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7377 if (!VDecl) { 7378 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7379 RealDecl->setInvalidDecl(); 7380 return; 7381 } 7382 7383 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7384 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7385 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7386 if (Exprs.size() > 1) { 7387 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7388 diag::err_auto_var_init_multiple_expressions) 7389 << VDecl->getDeclName() << VDecl->getType() 7390 << VDecl->getSourceRange(); 7391 RealDecl->setInvalidDecl(); 7392 return; 7393 } 7394 7395 Expr *Init = Exprs.get()[0]; 7396 TypeSourceInfo *DeducedType = 0; 7397 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7398 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7399 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7400 << Init->getSourceRange(); 7401 if (!DeducedType) { 7402 RealDecl->setInvalidDecl(); 7403 return; 7404 } 7405 VDecl->setTypeSourceInfo(DeducedType); 7406 VDecl->setType(DeducedType->getType()); 7407 7408 // If this is a redeclaration, check that the type we just deduced matches 7409 // the previously declared type. 7410 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7411 MergeVarDeclTypes(VDecl, Old); 7412 } 7413 7414 // We will represent direct-initialization similarly to copy-initialization: 7415 // int x(1); -as-> int x = 1; 7416 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7417 // 7418 // Clients that want to distinguish between the two forms, can check for 7419 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7420 // A major benefit is that clients that don't particularly care about which 7421 // exactly form was it (like the CodeGen) can handle both cases without 7422 // special case code. 7423 7424 // C++ 8.5p11: 7425 // The form of initialization (using parentheses or '=') is generally 7426 // insignificant, but does matter when the entity being initialized has a 7427 // class type. 7428 7429 if (!VDecl->getType()->isDependentType() && 7430 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7431 diag::err_typecheck_decl_incomplete_type)) { 7432 VDecl->setInvalidDecl(); 7433 return; 7434 } 7435 7436 // The variable can not have an abstract class type. 7437 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7438 diag::err_abstract_type_in_decl, 7439 AbstractVariableType)) 7440 VDecl->setInvalidDecl(); 7441 7442 const VarDecl *Def; 7443 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7444 Diag(VDecl->getLocation(), diag::err_redefinition) 7445 << VDecl->getDeclName(); 7446 Diag(Def->getLocation(), diag::note_previous_definition); 7447 VDecl->setInvalidDecl(); 7448 return; 7449 } 7450 7451 // C++ [class.static.data]p4 7452 // If a static data member is of const integral or const 7453 // enumeration type, its declaration in the class definition can 7454 // specify a constant-initializer which shall be an integral 7455 // constant expression (5.19). In that case, the member can appear 7456 // in integral constant expressions. The member shall still be 7457 // defined in a namespace scope if it is used in the program and the 7458 // namespace scope definition shall not contain an initializer. 7459 // 7460 // We already performed a redefinition check above, but for static 7461 // data members we also need to check whether there was an in-class 7462 // declaration with an initializer. 7463 const VarDecl* PrevInit = 0; 7464 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7465 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7466 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7467 return; 7468 } 7469 7470 bool IsDependent = false; 7471 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7472 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7473 VDecl->setInvalidDecl(); 7474 return; 7475 } 7476 7477 if (Exprs.get()[I]->isTypeDependent()) 7478 IsDependent = true; 7479 } 7480 7481 // If either the declaration has a dependent type or if any of the 7482 // expressions is type-dependent, we represent the initialization 7483 // via a ParenListExpr for later use during template instantiation. 7484 if (VDecl->getType()->isDependentType() || IsDependent) { 7485 // Let clients know that initialization was done with a direct initializer. 7486 VDecl->setCXXDirectInitializer(true); 7487 7488 // Store the initialization expressions as a ParenListExpr. 7489 unsigned NumExprs = Exprs.size(); 7490 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7491 (Expr **)Exprs.release(), 7492 NumExprs, RParenLoc)); 7493 return; 7494 } 7495 7496 // Capture the variable that is being initialized and the style of 7497 // initialization. 7498 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7499 7500 // FIXME: Poor source location information. 7501 InitializationKind Kind 7502 = InitializationKind::CreateDirect(VDecl->getLocation(), 7503 LParenLoc, RParenLoc); 7504 7505 InitializationSequence InitSeq(*this, Entity, Kind, 7506 Exprs.get(), Exprs.size()); 7507 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7508 if (Result.isInvalid()) { 7509 VDecl->setInvalidDecl(); 7510 return; 7511 } 7512 7513 CheckImplicitConversions(Result.get(), LParenLoc); 7514 7515 Result = MaybeCreateExprWithCleanups(Result); 7516 VDecl->setInit(Result.takeAs<Expr>()); 7517 VDecl->setCXXDirectInitializer(true); 7518 7519 CheckCompleteVariableDeclaration(VDecl); 7520} 7521 7522/// \brief Given a constructor and the set of arguments provided for the 7523/// constructor, convert the arguments and add any required default arguments 7524/// to form a proper call to this constructor. 7525/// 7526/// \returns true if an error occurred, false otherwise. 7527bool 7528Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7529 MultiExprArg ArgsPtr, 7530 SourceLocation Loc, 7531 ASTOwningVector<Expr*> &ConvertedArgs) { 7532 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7533 unsigned NumArgs = ArgsPtr.size(); 7534 Expr **Args = (Expr **)ArgsPtr.get(); 7535 7536 const FunctionProtoType *Proto 7537 = Constructor->getType()->getAs<FunctionProtoType>(); 7538 assert(Proto && "Constructor without a prototype?"); 7539 unsigned NumArgsInProto = Proto->getNumArgs(); 7540 7541 // If too few arguments are available, we'll fill in the rest with defaults. 7542 if (NumArgs < NumArgsInProto) 7543 ConvertedArgs.reserve(NumArgsInProto); 7544 else 7545 ConvertedArgs.reserve(NumArgs); 7546 7547 VariadicCallType CallType = 7548 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7549 llvm::SmallVector<Expr *, 8> AllArgs; 7550 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7551 Proto, 0, Args, NumArgs, AllArgs, 7552 CallType); 7553 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7554 ConvertedArgs.push_back(AllArgs[i]); 7555 return Invalid; 7556} 7557 7558static inline bool 7559CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7560 const FunctionDecl *FnDecl) { 7561 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7562 if (isa<NamespaceDecl>(DC)) { 7563 return SemaRef.Diag(FnDecl->getLocation(), 7564 diag::err_operator_new_delete_declared_in_namespace) 7565 << FnDecl->getDeclName(); 7566 } 7567 7568 if (isa<TranslationUnitDecl>(DC) && 7569 FnDecl->getStorageClass() == SC_Static) { 7570 return SemaRef.Diag(FnDecl->getLocation(), 7571 diag::err_operator_new_delete_declared_static) 7572 << FnDecl->getDeclName(); 7573 } 7574 7575 return false; 7576} 7577 7578static inline bool 7579CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7580 CanQualType ExpectedResultType, 7581 CanQualType ExpectedFirstParamType, 7582 unsigned DependentParamTypeDiag, 7583 unsigned InvalidParamTypeDiag) { 7584 QualType ResultType = 7585 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7586 7587 // Check that the result type is not dependent. 7588 if (ResultType->isDependentType()) 7589 return SemaRef.Diag(FnDecl->getLocation(), 7590 diag::err_operator_new_delete_dependent_result_type) 7591 << FnDecl->getDeclName() << ExpectedResultType; 7592 7593 // Check that the result type is what we expect. 7594 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7595 return SemaRef.Diag(FnDecl->getLocation(), 7596 diag::err_operator_new_delete_invalid_result_type) 7597 << FnDecl->getDeclName() << ExpectedResultType; 7598 7599 // A function template must have at least 2 parameters. 7600 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7601 return SemaRef.Diag(FnDecl->getLocation(), 7602 diag::err_operator_new_delete_template_too_few_parameters) 7603 << FnDecl->getDeclName(); 7604 7605 // The function decl must have at least 1 parameter. 7606 if (FnDecl->getNumParams() == 0) 7607 return SemaRef.Diag(FnDecl->getLocation(), 7608 diag::err_operator_new_delete_too_few_parameters) 7609 << FnDecl->getDeclName(); 7610 7611 // Check the the first parameter type is not dependent. 7612 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7613 if (FirstParamType->isDependentType()) 7614 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7615 << FnDecl->getDeclName() << ExpectedFirstParamType; 7616 7617 // Check that the first parameter type is what we expect. 7618 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7619 ExpectedFirstParamType) 7620 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7621 << FnDecl->getDeclName() << ExpectedFirstParamType; 7622 7623 return false; 7624} 7625 7626static bool 7627CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7628 // C++ [basic.stc.dynamic.allocation]p1: 7629 // A program is ill-formed if an allocation function is declared in a 7630 // namespace scope other than global scope or declared static in global 7631 // scope. 7632 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7633 return true; 7634 7635 CanQualType SizeTy = 7636 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7637 7638 // C++ [basic.stc.dynamic.allocation]p1: 7639 // The return type shall be void*. The first parameter shall have type 7640 // std::size_t. 7641 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7642 SizeTy, 7643 diag::err_operator_new_dependent_param_type, 7644 diag::err_operator_new_param_type)) 7645 return true; 7646 7647 // C++ [basic.stc.dynamic.allocation]p1: 7648 // The first parameter shall not have an associated default argument. 7649 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7650 return SemaRef.Diag(FnDecl->getLocation(), 7651 diag::err_operator_new_default_arg) 7652 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7653 7654 return false; 7655} 7656 7657static bool 7658CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7659 // C++ [basic.stc.dynamic.deallocation]p1: 7660 // A program is ill-formed if deallocation functions are declared in a 7661 // namespace scope other than global scope or declared static in global 7662 // scope. 7663 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7664 return true; 7665 7666 // C++ [basic.stc.dynamic.deallocation]p2: 7667 // Each deallocation function shall return void and its first parameter 7668 // shall be void*. 7669 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7670 SemaRef.Context.VoidPtrTy, 7671 diag::err_operator_delete_dependent_param_type, 7672 diag::err_operator_delete_param_type)) 7673 return true; 7674 7675 return false; 7676} 7677 7678/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7679/// of this overloaded operator is well-formed. If so, returns false; 7680/// otherwise, emits appropriate diagnostics and returns true. 7681bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7682 assert(FnDecl && FnDecl->isOverloadedOperator() && 7683 "Expected an overloaded operator declaration"); 7684 7685 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7686 7687 // C++ [over.oper]p5: 7688 // The allocation and deallocation functions, operator new, 7689 // operator new[], operator delete and operator delete[], are 7690 // described completely in 3.7.3. The attributes and restrictions 7691 // found in the rest of this subclause do not apply to them unless 7692 // explicitly stated in 3.7.3. 7693 if (Op == OO_Delete || Op == OO_Array_Delete) 7694 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7695 7696 if (Op == OO_New || Op == OO_Array_New) 7697 return CheckOperatorNewDeclaration(*this, FnDecl); 7698 7699 // C++ [over.oper]p6: 7700 // An operator function shall either be a non-static member 7701 // function or be a non-member function and have at least one 7702 // parameter whose type is a class, a reference to a class, an 7703 // enumeration, or a reference to an enumeration. 7704 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7705 if (MethodDecl->isStatic()) 7706 return Diag(FnDecl->getLocation(), 7707 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7708 } else { 7709 bool ClassOrEnumParam = false; 7710 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7711 ParamEnd = FnDecl->param_end(); 7712 Param != ParamEnd; ++Param) { 7713 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7714 if (ParamType->isDependentType() || ParamType->isRecordType() || 7715 ParamType->isEnumeralType()) { 7716 ClassOrEnumParam = true; 7717 break; 7718 } 7719 } 7720 7721 if (!ClassOrEnumParam) 7722 return Diag(FnDecl->getLocation(), 7723 diag::err_operator_overload_needs_class_or_enum) 7724 << FnDecl->getDeclName(); 7725 } 7726 7727 // C++ [over.oper]p8: 7728 // An operator function cannot have default arguments (8.3.6), 7729 // except where explicitly stated below. 7730 // 7731 // Only the function-call operator allows default arguments 7732 // (C++ [over.call]p1). 7733 if (Op != OO_Call) { 7734 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7735 Param != FnDecl->param_end(); ++Param) { 7736 if ((*Param)->hasDefaultArg()) 7737 return Diag((*Param)->getLocation(), 7738 diag::err_operator_overload_default_arg) 7739 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7740 } 7741 } 7742 7743 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7744 { false, false, false } 7745#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7746 , { Unary, Binary, MemberOnly } 7747#include "clang/Basic/OperatorKinds.def" 7748 }; 7749 7750 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7751 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7752 bool MustBeMemberOperator = OperatorUses[Op][2]; 7753 7754 // C++ [over.oper]p8: 7755 // [...] Operator functions cannot have more or fewer parameters 7756 // than the number required for the corresponding operator, as 7757 // described in the rest of this subclause. 7758 unsigned NumParams = FnDecl->getNumParams() 7759 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7760 if (Op != OO_Call && 7761 ((NumParams == 1 && !CanBeUnaryOperator) || 7762 (NumParams == 2 && !CanBeBinaryOperator) || 7763 (NumParams < 1) || (NumParams > 2))) { 7764 // We have the wrong number of parameters. 7765 unsigned ErrorKind; 7766 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7767 ErrorKind = 2; // 2 -> unary or binary. 7768 } else if (CanBeUnaryOperator) { 7769 ErrorKind = 0; // 0 -> unary 7770 } else { 7771 assert(CanBeBinaryOperator && 7772 "All non-call overloaded operators are unary or binary!"); 7773 ErrorKind = 1; // 1 -> binary 7774 } 7775 7776 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7777 << FnDecl->getDeclName() << NumParams << ErrorKind; 7778 } 7779 7780 // Overloaded operators other than operator() cannot be variadic. 7781 if (Op != OO_Call && 7782 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7783 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7784 << FnDecl->getDeclName(); 7785 } 7786 7787 // Some operators must be non-static member functions. 7788 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7789 return Diag(FnDecl->getLocation(), 7790 diag::err_operator_overload_must_be_member) 7791 << FnDecl->getDeclName(); 7792 } 7793 7794 // C++ [over.inc]p1: 7795 // The user-defined function called operator++ implements the 7796 // prefix and postfix ++ operator. If this function is a member 7797 // function with no parameters, or a non-member function with one 7798 // parameter of class or enumeration type, it defines the prefix 7799 // increment operator ++ for objects of that type. If the function 7800 // is a member function with one parameter (which shall be of type 7801 // int) or a non-member function with two parameters (the second 7802 // of which shall be of type int), it defines the postfix 7803 // increment operator ++ for objects of that type. 7804 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7805 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7806 bool ParamIsInt = false; 7807 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7808 ParamIsInt = BT->getKind() == BuiltinType::Int; 7809 7810 if (!ParamIsInt) 7811 return Diag(LastParam->getLocation(), 7812 diag::err_operator_overload_post_incdec_must_be_int) 7813 << LastParam->getType() << (Op == OO_MinusMinus); 7814 } 7815 7816 return false; 7817} 7818 7819/// CheckLiteralOperatorDeclaration - Check whether the declaration 7820/// of this literal operator function is well-formed. If so, returns 7821/// false; otherwise, emits appropriate diagnostics and returns true. 7822bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7823 DeclContext *DC = FnDecl->getDeclContext(); 7824 Decl::Kind Kind = DC->getDeclKind(); 7825 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7826 Kind != Decl::LinkageSpec) { 7827 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7828 << FnDecl->getDeclName(); 7829 return true; 7830 } 7831 7832 bool Valid = false; 7833 7834 // template <char...> type operator "" name() is the only valid template 7835 // signature, and the only valid signature with no parameters. 7836 if (FnDecl->param_size() == 0) { 7837 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7838 // Must have only one template parameter 7839 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7840 if (Params->size() == 1) { 7841 NonTypeTemplateParmDecl *PmDecl = 7842 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7843 7844 // The template parameter must be a char parameter pack. 7845 if (PmDecl && PmDecl->isTemplateParameterPack() && 7846 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7847 Valid = true; 7848 } 7849 } 7850 } else { 7851 // Check the first parameter 7852 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7853 7854 QualType T = (*Param)->getType(); 7855 7856 // unsigned long long int, long double, and any character type are allowed 7857 // as the only parameters. 7858 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7859 Context.hasSameType(T, Context.LongDoubleTy) || 7860 Context.hasSameType(T, Context.CharTy) || 7861 Context.hasSameType(T, Context.WCharTy) || 7862 Context.hasSameType(T, Context.Char16Ty) || 7863 Context.hasSameType(T, Context.Char32Ty)) { 7864 if (++Param == FnDecl->param_end()) 7865 Valid = true; 7866 goto FinishedParams; 7867 } 7868 7869 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7870 const PointerType *PT = T->getAs<PointerType>(); 7871 if (!PT) 7872 goto FinishedParams; 7873 T = PT->getPointeeType(); 7874 if (!T.isConstQualified()) 7875 goto FinishedParams; 7876 T = T.getUnqualifiedType(); 7877 7878 // Move on to the second parameter; 7879 ++Param; 7880 7881 // If there is no second parameter, the first must be a const char * 7882 if (Param == FnDecl->param_end()) { 7883 if (Context.hasSameType(T, Context.CharTy)) 7884 Valid = true; 7885 goto FinishedParams; 7886 } 7887 7888 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7889 // are allowed as the first parameter to a two-parameter function 7890 if (!(Context.hasSameType(T, Context.CharTy) || 7891 Context.hasSameType(T, Context.WCharTy) || 7892 Context.hasSameType(T, Context.Char16Ty) || 7893 Context.hasSameType(T, Context.Char32Ty))) 7894 goto FinishedParams; 7895 7896 // The second and final parameter must be an std::size_t 7897 T = (*Param)->getType().getUnqualifiedType(); 7898 if (Context.hasSameType(T, Context.getSizeType()) && 7899 ++Param == FnDecl->param_end()) 7900 Valid = true; 7901 } 7902 7903 // FIXME: This diagnostic is absolutely terrible. 7904FinishedParams: 7905 if (!Valid) { 7906 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7907 << FnDecl->getDeclName(); 7908 return true; 7909 } 7910 7911 return false; 7912} 7913 7914/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7915/// linkage specification, including the language and (if present) 7916/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7917/// the location of the language string literal, which is provided 7918/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7919/// the '{' brace. Otherwise, this linkage specification does not 7920/// have any braces. 7921Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7922 SourceLocation LangLoc, 7923 llvm::StringRef Lang, 7924 SourceLocation LBraceLoc) { 7925 LinkageSpecDecl::LanguageIDs Language; 7926 if (Lang == "\"C\"") 7927 Language = LinkageSpecDecl::lang_c; 7928 else if (Lang == "\"C++\"") 7929 Language = LinkageSpecDecl::lang_cxx; 7930 else { 7931 Diag(LangLoc, diag::err_bad_language); 7932 return 0; 7933 } 7934 7935 // FIXME: Add all the various semantics of linkage specifications 7936 7937 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7938 ExternLoc, LangLoc, Language); 7939 CurContext->addDecl(D); 7940 PushDeclContext(S, D); 7941 return D; 7942} 7943 7944/// ActOnFinishLinkageSpecification - Complete the definition of 7945/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7946/// valid, it's the position of the closing '}' brace in a linkage 7947/// specification that uses braces. 7948Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7949 Decl *LinkageSpec, 7950 SourceLocation RBraceLoc) { 7951 if (LinkageSpec) { 7952 if (RBraceLoc.isValid()) { 7953 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7954 LSDecl->setRBraceLoc(RBraceLoc); 7955 } 7956 PopDeclContext(); 7957 } 7958 return LinkageSpec; 7959} 7960 7961/// \brief Perform semantic analysis for the variable declaration that 7962/// occurs within a C++ catch clause, returning the newly-created 7963/// variable. 7964VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7965 TypeSourceInfo *TInfo, 7966 SourceLocation StartLoc, 7967 SourceLocation Loc, 7968 IdentifierInfo *Name) { 7969 bool Invalid = false; 7970 QualType ExDeclType = TInfo->getType(); 7971 7972 // Arrays and functions decay. 7973 if (ExDeclType->isArrayType()) 7974 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7975 else if (ExDeclType->isFunctionType()) 7976 ExDeclType = Context.getPointerType(ExDeclType); 7977 7978 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7979 // The exception-declaration shall not denote a pointer or reference to an 7980 // incomplete type, other than [cv] void*. 7981 // N2844 forbids rvalue references. 7982 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7983 Diag(Loc, diag::err_catch_rvalue_ref); 7984 Invalid = true; 7985 } 7986 7987 // GCC allows catching pointers and references to incomplete types 7988 // as an extension; so do we, but we warn by default. 7989 7990 QualType BaseType = ExDeclType; 7991 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7992 unsigned DK = diag::err_catch_incomplete; 7993 bool IncompleteCatchIsInvalid = true; 7994 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7995 BaseType = Ptr->getPointeeType(); 7996 Mode = 1; 7997 DK = diag::ext_catch_incomplete_ptr; 7998 IncompleteCatchIsInvalid = false; 7999 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8000 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8001 BaseType = Ref->getPointeeType(); 8002 Mode = 2; 8003 DK = diag::ext_catch_incomplete_ref; 8004 IncompleteCatchIsInvalid = false; 8005 } 8006 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8007 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8008 IncompleteCatchIsInvalid) 8009 Invalid = true; 8010 8011 if (!Invalid && !ExDeclType->isDependentType() && 8012 RequireNonAbstractType(Loc, ExDeclType, 8013 diag::err_abstract_type_in_decl, 8014 AbstractVariableType)) 8015 Invalid = true; 8016 8017 // Only the non-fragile NeXT runtime currently supports C++ catches 8018 // of ObjC types, and no runtime supports catching ObjC types by value. 8019 if (!Invalid && getLangOptions().ObjC1) { 8020 QualType T = ExDeclType; 8021 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8022 T = RT->getPointeeType(); 8023 8024 if (T->isObjCObjectType()) { 8025 Diag(Loc, diag::err_objc_object_catch); 8026 Invalid = true; 8027 } else if (T->isObjCObjectPointerType()) { 8028 if (!getLangOptions().ObjCNonFragileABI) { 8029 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 8030 Invalid = true; 8031 } 8032 } 8033 } 8034 8035 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8036 ExDeclType, TInfo, SC_None, SC_None); 8037 ExDecl->setExceptionVariable(true); 8038 8039 if (!Invalid) { 8040 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8041 // C++ [except.handle]p16: 8042 // The object declared in an exception-declaration or, if the 8043 // exception-declaration does not specify a name, a temporary (12.2) is 8044 // copy-initialized (8.5) from the exception object. [...] 8045 // The object is destroyed when the handler exits, after the destruction 8046 // of any automatic objects initialized within the handler. 8047 // 8048 // We just pretend to initialize the object with itself, then make sure 8049 // it can be destroyed later. 8050 QualType initType = ExDeclType; 8051 8052 InitializedEntity entity = 8053 InitializedEntity::InitializeVariable(ExDecl); 8054 InitializationKind initKind = 8055 InitializationKind::CreateCopy(Loc, SourceLocation()); 8056 8057 Expr *opaqueValue = 8058 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8059 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8060 ExprResult result = sequence.Perform(*this, entity, initKind, 8061 MultiExprArg(&opaqueValue, 1)); 8062 if (result.isInvalid()) 8063 Invalid = true; 8064 else { 8065 // If the constructor used was non-trivial, set this as the 8066 // "initializer". 8067 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8068 if (!construct->getConstructor()->isTrivial()) { 8069 Expr *init = MaybeCreateExprWithCleanups(construct); 8070 ExDecl->setInit(init); 8071 } 8072 8073 // And make sure it's destructable. 8074 FinalizeVarWithDestructor(ExDecl, recordType); 8075 } 8076 } 8077 } 8078 8079 if (Invalid) 8080 ExDecl->setInvalidDecl(); 8081 8082 return ExDecl; 8083} 8084 8085/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8086/// handler. 8087Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8088 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8089 bool Invalid = D.isInvalidType(); 8090 8091 // Check for unexpanded parameter packs. 8092 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8093 UPPC_ExceptionType)) { 8094 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8095 D.getIdentifierLoc()); 8096 Invalid = true; 8097 } 8098 8099 IdentifierInfo *II = D.getIdentifier(); 8100 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8101 LookupOrdinaryName, 8102 ForRedeclaration)) { 8103 // The scope should be freshly made just for us. There is just no way 8104 // it contains any previous declaration. 8105 assert(!S->isDeclScope(PrevDecl)); 8106 if (PrevDecl->isTemplateParameter()) { 8107 // Maybe we will complain about the shadowed template parameter. 8108 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8109 } 8110 } 8111 8112 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8113 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8114 << D.getCXXScopeSpec().getRange(); 8115 Invalid = true; 8116 } 8117 8118 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8119 D.getSourceRange().getBegin(), 8120 D.getIdentifierLoc(), 8121 D.getIdentifier()); 8122 if (Invalid) 8123 ExDecl->setInvalidDecl(); 8124 8125 // Add the exception declaration into this scope. 8126 if (II) 8127 PushOnScopeChains(ExDecl, S); 8128 else 8129 CurContext->addDecl(ExDecl); 8130 8131 ProcessDeclAttributes(S, ExDecl, D); 8132 return ExDecl; 8133} 8134 8135Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8136 Expr *AssertExpr, 8137 Expr *AssertMessageExpr_, 8138 SourceLocation RParenLoc) { 8139 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8140 8141 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8142 llvm::APSInt Value(32); 8143 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8144 Diag(StaticAssertLoc, 8145 diag::err_static_assert_expression_is_not_constant) << 8146 AssertExpr->getSourceRange(); 8147 return 0; 8148 } 8149 8150 if (Value == 0) { 8151 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8152 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8153 } 8154 } 8155 8156 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8157 return 0; 8158 8159 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8160 AssertExpr, AssertMessage, RParenLoc); 8161 8162 CurContext->addDecl(Decl); 8163 return Decl; 8164} 8165 8166/// \brief Perform semantic analysis of the given friend type declaration. 8167/// 8168/// \returns A friend declaration that. 8169FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8170 TypeSourceInfo *TSInfo) { 8171 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8172 8173 QualType T = TSInfo->getType(); 8174 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8175 8176 if (!getLangOptions().CPlusPlus0x) { 8177 // C++03 [class.friend]p2: 8178 // An elaborated-type-specifier shall be used in a friend declaration 8179 // for a class.* 8180 // 8181 // * The class-key of the elaborated-type-specifier is required. 8182 if (!ActiveTemplateInstantiations.empty()) { 8183 // Do not complain about the form of friend template types during 8184 // template instantiation; we will already have complained when the 8185 // template was declared. 8186 } else if (!T->isElaboratedTypeSpecifier()) { 8187 // If we evaluated the type to a record type, suggest putting 8188 // a tag in front. 8189 if (const RecordType *RT = T->getAs<RecordType>()) { 8190 RecordDecl *RD = RT->getDecl(); 8191 8192 std::string InsertionText = std::string(" ") + RD->getKindName(); 8193 8194 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8195 << (unsigned) RD->getTagKind() 8196 << T 8197 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8198 InsertionText); 8199 } else { 8200 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8201 << T 8202 << SourceRange(FriendLoc, TypeRange.getEnd()); 8203 } 8204 } else if (T->getAs<EnumType>()) { 8205 Diag(FriendLoc, diag::ext_enum_friend) 8206 << T 8207 << SourceRange(FriendLoc, TypeRange.getEnd()); 8208 } 8209 } 8210 8211 // C++0x [class.friend]p3: 8212 // If the type specifier in a friend declaration designates a (possibly 8213 // cv-qualified) class type, that class is declared as a friend; otherwise, 8214 // the friend declaration is ignored. 8215 8216 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8217 // in [class.friend]p3 that we do not implement. 8218 8219 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8220} 8221 8222/// Handle a friend tag declaration where the scope specifier was 8223/// templated. 8224Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8225 unsigned TagSpec, SourceLocation TagLoc, 8226 CXXScopeSpec &SS, 8227 IdentifierInfo *Name, SourceLocation NameLoc, 8228 AttributeList *Attr, 8229 MultiTemplateParamsArg TempParamLists) { 8230 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8231 8232 bool isExplicitSpecialization = false; 8233 bool Invalid = false; 8234 8235 if (TemplateParameterList *TemplateParams 8236 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8237 TempParamLists.get(), 8238 TempParamLists.size(), 8239 /*friend*/ true, 8240 isExplicitSpecialization, 8241 Invalid)) { 8242 if (TemplateParams->size() > 0) { 8243 // This is a declaration of a class template. 8244 if (Invalid) 8245 return 0; 8246 8247 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8248 SS, Name, NameLoc, Attr, 8249 TemplateParams, AS_public, 8250 TempParamLists.size() - 1, 8251 (TemplateParameterList**) TempParamLists.release()).take(); 8252 } else { 8253 // The "template<>" header is extraneous. 8254 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8255 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8256 isExplicitSpecialization = true; 8257 } 8258 } 8259 8260 if (Invalid) return 0; 8261 8262 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8263 8264 bool isAllExplicitSpecializations = true; 8265 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8266 if (TempParamLists.get()[I]->size()) { 8267 isAllExplicitSpecializations = false; 8268 break; 8269 } 8270 } 8271 8272 // FIXME: don't ignore attributes. 8273 8274 // If it's explicit specializations all the way down, just forget 8275 // about the template header and build an appropriate non-templated 8276 // friend. TODO: for source fidelity, remember the headers. 8277 if (isAllExplicitSpecializations) { 8278 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8279 ElaboratedTypeKeyword Keyword 8280 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8281 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8282 *Name, NameLoc); 8283 if (T.isNull()) 8284 return 0; 8285 8286 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8287 if (isa<DependentNameType>(T)) { 8288 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8289 TL.setKeywordLoc(TagLoc); 8290 TL.setQualifierLoc(QualifierLoc); 8291 TL.setNameLoc(NameLoc); 8292 } else { 8293 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8294 TL.setKeywordLoc(TagLoc); 8295 TL.setQualifierLoc(QualifierLoc); 8296 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8297 } 8298 8299 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8300 TSI, FriendLoc); 8301 Friend->setAccess(AS_public); 8302 CurContext->addDecl(Friend); 8303 return Friend; 8304 } 8305 8306 // Handle the case of a templated-scope friend class. e.g. 8307 // template <class T> class A<T>::B; 8308 // FIXME: we don't support these right now. 8309 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8310 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8311 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8312 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8313 TL.setKeywordLoc(TagLoc); 8314 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8315 TL.setNameLoc(NameLoc); 8316 8317 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8318 TSI, FriendLoc); 8319 Friend->setAccess(AS_public); 8320 Friend->setUnsupportedFriend(true); 8321 CurContext->addDecl(Friend); 8322 return Friend; 8323} 8324 8325 8326/// Handle a friend type declaration. This works in tandem with 8327/// ActOnTag. 8328/// 8329/// Notes on friend class templates: 8330/// 8331/// We generally treat friend class declarations as if they were 8332/// declaring a class. So, for example, the elaborated type specifier 8333/// in a friend declaration is required to obey the restrictions of a 8334/// class-head (i.e. no typedefs in the scope chain), template 8335/// parameters are required to match up with simple template-ids, &c. 8336/// However, unlike when declaring a template specialization, it's 8337/// okay to refer to a template specialization without an empty 8338/// template parameter declaration, e.g. 8339/// friend class A<T>::B<unsigned>; 8340/// We permit this as a special case; if there are any template 8341/// parameters present at all, require proper matching, i.e. 8342/// template <> template <class T> friend class A<int>::B; 8343Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8344 MultiTemplateParamsArg TempParams) { 8345 SourceLocation Loc = DS.getSourceRange().getBegin(); 8346 8347 assert(DS.isFriendSpecified()); 8348 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8349 8350 // Try to convert the decl specifier to a type. This works for 8351 // friend templates because ActOnTag never produces a ClassTemplateDecl 8352 // for a TUK_Friend. 8353 Declarator TheDeclarator(DS, Declarator::MemberContext); 8354 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8355 QualType T = TSI->getType(); 8356 if (TheDeclarator.isInvalidType()) 8357 return 0; 8358 8359 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8360 return 0; 8361 8362 // This is definitely an error in C++98. It's probably meant to 8363 // be forbidden in C++0x, too, but the specification is just 8364 // poorly written. 8365 // 8366 // The problem is with declarations like the following: 8367 // template <T> friend A<T>::foo; 8368 // where deciding whether a class C is a friend or not now hinges 8369 // on whether there exists an instantiation of A that causes 8370 // 'foo' to equal C. There are restrictions on class-heads 8371 // (which we declare (by fiat) elaborated friend declarations to 8372 // be) that makes this tractable. 8373 // 8374 // FIXME: handle "template <> friend class A<T>;", which 8375 // is possibly well-formed? Who even knows? 8376 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8377 Diag(Loc, diag::err_tagless_friend_type_template) 8378 << DS.getSourceRange(); 8379 return 0; 8380 } 8381 8382 // C++98 [class.friend]p1: A friend of a class is a function 8383 // or class that is not a member of the class . . . 8384 // This is fixed in DR77, which just barely didn't make the C++03 8385 // deadline. It's also a very silly restriction that seriously 8386 // affects inner classes and which nobody else seems to implement; 8387 // thus we never diagnose it, not even in -pedantic. 8388 // 8389 // But note that we could warn about it: it's always useless to 8390 // friend one of your own members (it's not, however, worthless to 8391 // friend a member of an arbitrary specialization of your template). 8392 8393 Decl *D; 8394 if (unsigned NumTempParamLists = TempParams.size()) 8395 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8396 NumTempParamLists, 8397 TempParams.release(), 8398 TSI, 8399 DS.getFriendSpecLoc()); 8400 else 8401 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8402 8403 if (!D) 8404 return 0; 8405 8406 D->setAccess(AS_public); 8407 CurContext->addDecl(D); 8408 8409 return D; 8410} 8411 8412Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8413 MultiTemplateParamsArg TemplateParams) { 8414 const DeclSpec &DS = D.getDeclSpec(); 8415 8416 assert(DS.isFriendSpecified()); 8417 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8418 8419 SourceLocation Loc = D.getIdentifierLoc(); 8420 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8421 QualType T = TInfo->getType(); 8422 8423 // C++ [class.friend]p1 8424 // A friend of a class is a function or class.... 8425 // Note that this sees through typedefs, which is intended. 8426 // It *doesn't* see through dependent types, which is correct 8427 // according to [temp.arg.type]p3: 8428 // If a declaration acquires a function type through a 8429 // type dependent on a template-parameter and this causes 8430 // a declaration that does not use the syntactic form of a 8431 // function declarator to have a function type, the program 8432 // is ill-formed. 8433 if (!T->isFunctionType()) { 8434 Diag(Loc, diag::err_unexpected_friend); 8435 8436 // It might be worthwhile to try to recover by creating an 8437 // appropriate declaration. 8438 return 0; 8439 } 8440 8441 // C++ [namespace.memdef]p3 8442 // - If a friend declaration in a non-local class first declares a 8443 // class or function, the friend class or function is a member 8444 // of the innermost enclosing namespace. 8445 // - The name of the friend is not found by simple name lookup 8446 // until a matching declaration is provided in that namespace 8447 // scope (either before or after the class declaration granting 8448 // friendship). 8449 // - If a friend function is called, its name may be found by the 8450 // name lookup that considers functions from namespaces and 8451 // classes associated with the types of the function arguments. 8452 // - When looking for a prior declaration of a class or a function 8453 // declared as a friend, scopes outside the innermost enclosing 8454 // namespace scope are not considered. 8455 8456 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8457 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8458 DeclarationName Name = NameInfo.getName(); 8459 assert(Name); 8460 8461 // Check for unexpanded parameter packs. 8462 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8463 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8464 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8465 return 0; 8466 8467 // The context we found the declaration in, or in which we should 8468 // create the declaration. 8469 DeclContext *DC; 8470 Scope *DCScope = S; 8471 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8472 ForRedeclaration); 8473 8474 // FIXME: there are different rules in local classes 8475 8476 // There are four cases here. 8477 // - There's no scope specifier, in which case we just go to the 8478 // appropriate scope and look for a function or function template 8479 // there as appropriate. 8480 // Recover from invalid scope qualifiers as if they just weren't there. 8481 if (SS.isInvalid() || !SS.isSet()) { 8482 // C++0x [namespace.memdef]p3: 8483 // If the name in a friend declaration is neither qualified nor 8484 // a template-id and the declaration is a function or an 8485 // elaborated-type-specifier, the lookup to determine whether 8486 // the entity has been previously declared shall not consider 8487 // any scopes outside the innermost enclosing namespace. 8488 // C++0x [class.friend]p11: 8489 // If a friend declaration appears in a local class and the name 8490 // specified is an unqualified name, a prior declaration is 8491 // looked up without considering scopes that are outside the 8492 // innermost enclosing non-class scope. For a friend function 8493 // declaration, if there is no prior declaration, the program is 8494 // ill-formed. 8495 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8496 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8497 8498 // Find the appropriate context according to the above. 8499 DC = CurContext; 8500 while (true) { 8501 // Skip class contexts. If someone can cite chapter and verse 8502 // for this behavior, that would be nice --- it's what GCC and 8503 // EDG do, and it seems like a reasonable intent, but the spec 8504 // really only says that checks for unqualified existing 8505 // declarations should stop at the nearest enclosing namespace, 8506 // not that they should only consider the nearest enclosing 8507 // namespace. 8508 while (DC->isRecord()) 8509 DC = DC->getParent(); 8510 8511 LookupQualifiedName(Previous, DC); 8512 8513 // TODO: decide what we think about using declarations. 8514 if (isLocal || !Previous.empty()) 8515 break; 8516 8517 if (isTemplateId) { 8518 if (isa<TranslationUnitDecl>(DC)) break; 8519 } else { 8520 if (DC->isFileContext()) break; 8521 } 8522 DC = DC->getParent(); 8523 } 8524 8525 // C++ [class.friend]p1: A friend of a class is a function or 8526 // class that is not a member of the class . . . 8527 // C++0x changes this for both friend types and functions. 8528 // Most C++ 98 compilers do seem to give an error here, so 8529 // we do, too. 8530 if (!Previous.empty() && DC->Equals(CurContext) 8531 && !getLangOptions().CPlusPlus0x) 8532 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8533 8534 DCScope = getScopeForDeclContext(S, DC); 8535 8536 // - There's a non-dependent scope specifier, in which case we 8537 // compute it and do a previous lookup there for a function 8538 // or function template. 8539 } else if (!SS.getScopeRep()->isDependent()) { 8540 DC = computeDeclContext(SS); 8541 if (!DC) return 0; 8542 8543 if (RequireCompleteDeclContext(SS, DC)) return 0; 8544 8545 LookupQualifiedName(Previous, DC); 8546 8547 // Ignore things found implicitly in the wrong scope. 8548 // TODO: better diagnostics for this case. Suggesting the right 8549 // qualified scope would be nice... 8550 LookupResult::Filter F = Previous.makeFilter(); 8551 while (F.hasNext()) { 8552 NamedDecl *D = F.next(); 8553 if (!DC->InEnclosingNamespaceSetOf( 8554 D->getDeclContext()->getRedeclContext())) 8555 F.erase(); 8556 } 8557 F.done(); 8558 8559 if (Previous.empty()) { 8560 D.setInvalidType(); 8561 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8562 return 0; 8563 } 8564 8565 // C++ [class.friend]p1: A friend of a class is a function or 8566 // class that is not a member of the class . . . 8567 if (DC->Equals(CurContext)) 8568 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8569 8570 // - There's a scope specifier that does not match any template 8571 // parameter lists, in which case we use some arbitrary context, 8572 // create a method or method template, and wait for instantiation. 8573 // - There's a scope specifier that does match some template 8574 // parameter lists, which we don't handle right now. 8575 } else { 8576 DC = CurContext; 8577 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8578 } 8579 8580 if (!DC->isRecord()) { 8581 // This implies that it has to be an operator or function. 8582 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8583 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8584 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8585 Diag(Loc, diag::err_introducing_special_friend) << 8586 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8587 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8588 return 0; 8589 } 8590 } 8591 8592 bool Redeclaration = false; 8593 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8594 move(TemplateParams), 8595 IsDefinition, 8596 Redeclaration); 8597 if (!ND) return 0; 8598 8599 assert(ND->getDeclContext() == DC); 8600 assert(ND->getLexicalDeclContext() == CurContext); 8601 8602 // Add the function declaration to the appropriate lookup tables, 8603 // adjusting the redeclarations list as necessary. We don't 8604 // want to do this yet if the friending class is dependent. 8605 // 8606 // Also update the scope-based lookup if the target context's 8607 // lookup context is in lexical scope. 8608 if (!CurContext->isDependentContext()) { 8609 DC = DC->getRedeclContext(); 8610 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8611 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8612 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8613 } 8614 8615 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8616 D.getIdentifierLoc(), ND, 8617 DS.getFriendSpecLoc()); 8618 FrD->setAccess(AS_public); 8619 CurContext->addDecl(FrD); 8620 8621 if (ND->isInvalidDecl()) 8622 FrD->setInvalidDecl(); 8623 else { 8624 FunctionDecl *FD; 8625 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8626 FD = FTD->getTemplatedDecl(); 8627 else 8628 FD = cast<FunctionDecl>(ND); 8629 8630 // Mark templated-scope function declarations as unsupported. 8631 if (FD->getNumTemplateParameterLists()) 8632 FrD->setUnsupportedFriend(true); 8633 } 8634 8635 return ND; 8636} 8637 8638void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8639 AdjustDeclIfTemplate(Dcl); 8640 8641 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8642 if (!Fn) { 8643 Diag(DelLoc, diag::err_deleted_non_function); 8644 return; 8645 } 8646 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8647 Diag(DelLoc, diag::err_deleted_decl_not_first); 8648 Diag(Prev->getLocation(), diag::note_previous_declaration); 8649 // If the declaration wasn't the first, we delete the function anyway for 8650 // recovery. 8651 } 8652 Fn->setDeletedAsWritten(); 8653} 8654 8655void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8656 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8657 8658 if (MD) { 8659 CXXSpecialMember Member = getSpecialMember(MD); 8660 if (Member == CXXInvalid) { 8661 Diag(DefaultLoc, diag::err_default_special_members); 8662 return; 8663 } 8664 8665 MD->setDefaulted(); 8666 MD->setExplicitlyDefaulted(); 8667 8668 // We'll check it when the record is done 8669 if (MD == MD->getCanonicalDecl()) 8670 return; 8671 8672 switch (Member) { 8673 case CXXDefaultConstructor: { 8674 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8675 CheckExplicitlyDefaultedDefaultConstructor(CD); 8676 if (!CD->isInvalidDecl()) 8677 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8678 break; 8679 } 8680 8681 case CXXCopyConstructor: { 8682 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8683 CheckExplicitlyDefaultedCopyConstructor(CD); 8684 if (!CD->isInvalidDecl()) 8685 DefineImplicitCopyConstructor(DefaultLoc, CD); 8686 break; 8687 } 8688 8689 case CXXCopyAssignment: { 8690 CheckExplicitlyDefaultedCopyAssignment(MD); 8691 if (!MD->isInvalidDecl()) 8692 DefineImplicitCopyAssignment(DefaultLoc, MD); 8693 break; 8694 } 8695 8696 case CXXDestructor: { 8697 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8698 CheckExplicitlyDefaultedDestructor(DD); 8699 if (!DD->isInvalidDecl()) 8700 DefineImplicitDestructor(DefaultLoc, DD); 8701 break; 8702 } 8703 8704 default: 8705 // FIXME: Do the rest once we have move functions 8706 break; 8707 } 8708 } else { 8709 Diag(DefaultLoc, diag::err_default_special_members); 8710 } 8711} 8712 8713static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8714 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8715 Stmt *SubStmt = *CI; 8716 if (!SubStmt) 8717 continue; 8718 if (isa<ReturnStmt>(SubStmt)) 8719 Self.Diag(SubStmt->getSourceRange().getBegin(), 8720 diag::err_return_in_constructor_handler); 8721 if (!isa<Expr>(SubStmt)) 8722 SearchForReturnInStmt(Self, SubStmt); 8723 } 8724} 8725 8726void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8727 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8728 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8729 SearchForReturnInStmt(*this, Handler); 8730 } 8731} 8732 8733bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8734 const CXXMethodDecl *Old) { 8735 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8736 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8737 8738 if (Context.hasSameType(NewTy, OldTy) || 8739 NewTy->isDependentType() || OldTy->isDependentType()) 8740 return false; 8741 8742 // Check if the return types are covariant 8743 QualType NewClassTy, OldClassTy; 8744 8745 /// Both types must be pointers or references to classes. 8746 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8747 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8748 NewClassTy = NewPT->getPointeeType(); 8749 OldClassTy = OldPT->getPointeeType(); 8750 } 8751 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8752 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8753 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8754 NewClassTy = NewRT->getPointeeType(); 8755 OldClassTy = OldRT->getPointeeType(); 8756 } 8757 } 8758 } 8759 8760 // The return types aren't either both pointers or references to a class type. 8761 if (NewClassTy.isNull()) { 8762 Diag(New->getLocation(), 8763 diag::err_different_return_type_for_overriding_virtual_function) 8764 << New->getDeclName() << NewTy << OldTy; 8765 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8766 8767 return true; 8768 } 8769 8770 // C++ [class.virtual]p6: 8771 // If the return type of D::f differs from the return type of B::f, the 8772 // class type in the return type of D::f shall be complete at the point of 8773 // declaration of D::f or shall be the class type D. 8774 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8775 if (!RT->isBeingDefined() && 8776 RequireCompleteType(New->getLocation(), NewClassTy, 8777 PDiag(diag::err_covariant_return_incomplete) 8778 << New->getDeclName())) 8779 return true; 8780 } 8781 8782 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8783 // Check if the new class derives from the old class. 8784 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8785 Diag(New->getLocation(), 8786 diag::err_covariant_return_not_derived) 8787 << New->getDeclName() << NewTy << OldTy; 8788 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8789 return true; 8790 } 8791 8792 // Check if we the conversion from derived to base is valid. 8793 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8794 diag::err_covariant_return_inaccessible_base, 8795 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8796 // FIXME: Should this point to the return type? 8797 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8798 // FIXME: this note won't trigger for delayed access control 8799 // diagnostics, and it's impossible to get an undelayed error 8800 // here from access control during the original parse because 8801 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8802 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8803 return true; 8804 } 8805 } 8806 8807 // The qualifiers of the return types must be the same. 8808 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8809 Diag(New->getLocation(), 8810 diag::err_covariant_return_type_different_qualifications) 8811 << New->getDeclName() << NewTy << OldTy; 8812 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8813 return true; 8814 }; 8815 8816 8817 // The new class type must have the same or less qualifiers as the old type. 8818 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8819 Diag(New->getLocation(), 8820 diag::err_covariant_return_type_class_type_more_qualified) 8821 << New->getDeclName() << NewTy << OldTy; 8822 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8823 return true; 8824 }; 8825 8826 return false; 8827} 8828 8829/// \brief Mark the given method pure. 8830/// 8831/// \param Method the method to be marked pure. 8832/// 8833/// \param InitRange the source range that covers the "0" initializer. 8834bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8835 SourceLocation EndLoc = InitRange.getEnd(); 8836 if (EndLoc.isValid()) 8837 Method->setRangeEnd(EndLoc); 8838 8839 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8840 Method->setPure(); 8841 return false; 8842 } 8843 8844 if (!Method->isInvalidDecl()) 8845 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8846 << Method->getDeclName() << InitRange; 8847 return true; 8848} 8849 8850/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8851/// an initializer for the out-of-line declaration 'Dcl'. The scope 8852/// is a fresh scope pushed for just this purpose. 8853/// 8854/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8855/// static data member of class X, names should be looked up in the scope of 8856/// class X. 8857void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8858 // If there is no declaration, there was an error parsing it. 8859 if (D == 0 || D->isInvalidDecl()) return; 8860 8861 // We should only get called for declarations with scope specifiers, like: 8862 // int foo::bar; 8863 assert(D->isOutOfLine()); 8864 EnterDeclaratorContext(S, D->getDeclContext()); 8865} 8866 8867/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8868/// initializer for the out-of-line declaration 'D'. 8869void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8870 // If there is no declaration, there was an error parsing it. 8871 if (D == 0 || D->isInvalidDecl()) return; 8872 8873 assert(D->isOutOfLine()); 8874 ExitDeclaratorContext(S); 8875} 8876 8877/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8878/// C++ if/switch/while/for statement. 8879/// e.g: "if (int x = f()) {...}" 8880DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8881 // C++ 6.4p2: 8882 // The declarator shall not specify a function or an array. 8883 // The type-specifier-seq shall not contain typedef and shall not declare a 8884 // new class or enumeration. 8885 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8886 "Parser allowed 'typedef' as storage class of condition decl."); 8887 8888 TagDecl *OwnedTag = 0; 8889 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8890 QualType Ty = TInfo->getType(); 8891 8892 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8893 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8894 // would be created and CXXConditionDeclExpr wants a VarDecl. 8895 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8896 << D.getSourceRange(); 8897 return DeclResult(); 8898 } else if (OwnedTag && OwnedTag->isDefinition()) { 8899 // The type-specifier-seq shall not declare a new class or enumeration. 8900 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8901 } 8902 8903 Decl *Dcl = ActOnDeclarator(S, D); 8904 if (!Dcl) 8905 return DeclResult(); 8906 8907 return Dcl; 8908} 8909 8910void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8911 bool DefinitionRequired) { 8912 // Ignore any vtable uses in unevaluated operands or for classes that do 8913 // not have a vtable. 8914 if (!Class->isDynamicClass() || Class->isDependentContext() || 8915 CurContext->isDependentContext() || 8916 ExprEvalContexts.back().Context == Unevaluated) 8917 return; 8918 8919 // Try to insert this class into the map. 8920 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8921 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8922 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8923 if (!Pos.second) { 8924 // If we already had an entry, check to see if we are promoting this vtable 8925 // to required a definition. If so, we need to reappend to the VTableUses 8926 // list, since we may have already processed the first entry. 8927 if (DefinitionRequired && !Pos.first->second) { 8928 Pos.first->second = true; 8929 } else { 8930 // Otherwise, we can early exit. 8931 return; 8932 } 8933 } 8934 8935 // Local classes need to have their virtual members marked 8936 // immediately. For all other classes, we mark their virtual members 8937 // at the end of the translation unit. 8938 if (Class->isLocalClass()) 8939 MarkVirtualMembersReferenced(Loc, Class); 8940 else 8941 VTableUses.push_back(std::make_pair(Class, Loc)); 8942} 8943 8944bool Sema::DefineUsedVTables() { 8945 if (VTableUses.empty()) 8946 return false; 8947 8948 // Note: The VTableUses vector could grow as a result of marking 8949 // the members of a class as "used", so we check the size each 8950 // time through the loop and prefer indices (with are stable) to 8951 // iterators (which are not). 8952 bool DefinedAnything = false; 8953 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8954 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8955 if (!Class) 8956 continue; 8957 8958 SourceLocation Loc = VTableUses[I].second; 8959 8960 // If this class has a key function, but that key function is 8961 // defined in another translation unit, we don't need to emit the 8962 // vtable even though we're using it. 8963 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8964 if (KeyFunction && !KeyFunction->hasBody()) { 8965 switch (KeyFunction->getTemplateSpecializationKind()) { 8966 case TSK_Undeclared: 8967 case TSK_ExplicitSpecialization: 8968 case TSK_ExplicitInstantiationDeclaration: 8969 // The key function is in another translation unit. 8970 continue; 8971 8972 case TSK_ExplicitInstantiationDefinition: 8973 case TSK_ImplicitInstantiation: 8974 // We will be instantiating the key function. 8975 break; 8976 } 8977 } else if (!KeyFunction) { 8978 // If we have a class with no key function that is the subject 8979 // of an explicit instantiation declaration, suppress the 8980 // vtable; it will live with the explicit instantiation 8981 // definition. 8982 bool IsExplicitInstantiationDeclaration 8983 = Class->getTemplateSpecializationKind() 8984 == TSK_ExplicitInstantiationDeclaration; 8985 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8986 REnd = Class->redecls_end(); 8987 R != REnd; ++R) { 8988 TemplateSpecializationKind TSK 8989 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8990 if (TSK == TSK_ExplicitInstantiationDeclaration) 8991 IsExplicitInstantiationDeclaration = true; 8992 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8993 IsExplicitInstantiationDeclaration = false; 8994 break; 8995 } 8996 } 8997 8998 if (IsExplicitInstantiationDeclaration) 8999 continue; 9000 } 9001 9002 // Mark all of the virtual members of this class as referenced, so 9003 // that we can build a vtable. Then, tell the AST consumer that a 9004 // vtable for this class is required. 9005 DefinedAnything = true; 9006 MarkVirtualMembersReferenced(Loc, Class); 9007 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9008 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9009 9010 // Optionally warn if we're emitting a weak vtable. 9011 if (Class->getLinkage() == ExternalLinkage && 9012 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9013 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9014 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9015 } 9016 } 9017 VTableUses.clear(); 9018 9019 return DefinedAnything; 9020} 9021 9022void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9023 const CXXRecordDecl *RD) { 9024 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9025 e = RD->method_end(); i != e; ++i) { 9026 CXXMethodDecl *MD = *i; 9027 9028 // C++ [basic.def.odr]p2: 9029 // [...] A virtual member function is used if it is not pure. [...] 9030 if (MD->isVirtual() && !MD->isPure()) 9031 MarkDeclarationReferenced(Loc, MD); 9032 } 9033 9034 // Only classes that have virtual bases need a VTT. 9035 if (RD->getNumVBases() == 0) 9036 return; 9037 9038 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9039 e = RD->bases_end(); i != e; ++i) { 9040 const CXXRecordDecl *Base = 9041 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9042 if (Base->getNumVBases() == 0) 9043 continue; 9044 MarkVirtualMembersReferenced(Loc, Base); 9045 } 9046} 9047 9048/// SetIvarInitializers - This routine builds initialization ASTs for the 9049/// Objective-C implementation whose ivars need be initialized. 9050void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9051 if (!getLangOptions().CPlusPlus) 9052 return; 9053 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9054 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9055 CollectIvarsToConstructOrDestruct(OID, ivars); 9056 if (ivars.empty()) 9057 return; 9058 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9059 for (unsigned i = 0; i < ivars.size(); i++) { 9060 FieldDecl *Field = ivars[i]; 9061 if (Field->isInvalidDecl()) 9062 continue; 9063 9064 CXXCtorInitializer *Member; 9065 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9066 InitializationKind InitKind = 9067 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9068 9069 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9070 ExprResult MemberInit = 9071 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9072 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9073 // Note, MemberInit could actually come back empty if no initialization 9074 // is required (e.g., because it would call a trivial default constructor) 9075 if (!MemberInit.get() || MemberInit.isInvalid()) 9076 continue; 9077 9078 Member = 9079 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9080 SourceLocation(), 9081 MemberInit.takeAs<Expr>(), 9082 SourceLocation()); 9083 AllToInit.push_back(Member); 9084 9085 // Be sure that the destructor is accessible and is marked as referenced. 9086 if (const RecordType *RecordTy 9087 = Context.getBaseElementType(Field->getType()) 9088 ->getAs<RecordType>()) { 9089 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9090 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9091 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9092 CheckDestructorAccess(Field->getLocation(), Destructor, 9093 PDiag(diag::err_access_dtor_ivar) 9094 << Context.getBaseElementType(Field->getType())); 9095 } 9096 } 9097 } 9098 ObjCImplementation->setIvarInitializers(Context, 9099 AllToInit.data(), AllToInit.size()); 9100 } 9101} 9102 9103static 9104void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9105 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9106 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9107 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9108 Sema &S) { 9109 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9110 CE = Current.end(); 9111 if (Ctor->isInvalidDecl()) 9112 return; 9113 9114 const FunctionDecl *FNTarget = 0; 9115 CXXConstructorDecl *Target; 9116 9117 // We ignore the result here since if we don't have a body, Target will be 9118 // null below. 9119 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9120 Target 9121= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9122 9123 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9124 // Avoid dereferencing a null pointer here. 9125 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9126 9127 if (!Current.insert(Canonical)) 9128 return; 9129 9130 // We know that beyond here, we aren't chaining into a cycle. 9131 if (!Target || !Target->isDelegatingConstructor() || 9132 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9133 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9134 Valid.insert(*CI); 9135 Current.clear(); 9136 // We've hit a cycle. 9137 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9138 Current.count(TCanonical)) { 9139 // If we haven't diagnosed this cycle yet, do so now. 9140 if (!Invalid.count(TCanonical)) { 9141 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9142 diag::warn_delegating_ctor_cycle) 9143 << Ctor; 9144 9145 // Don't add a note for a function delegating directo to itself. 9146 if (TCanonical != Canonical) 9147 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9148 9149 CXXConstructorDecl *C = Target; 9150 while (C->getCanonicalDecl() != Canonical) { 9151 (void)C->getTargetConstructor()->hasBody(FNTarget); 9152 assert(FNTarget && "Ctor cycle through bodiless function"); 9153 9154 C 9155 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9156 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9157 } 9158 } 9159 9160 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9161 Invalid.insert(*CI); 9162 Current.clear(); 9163 } else { 9164 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9165 } 9166} 9167 9168 9169void Sema::CheckDelegatingCtorCycles() { 9170 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9171 9172 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9173 CE = Current.end(); 9174 9175 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9176 I = DelegatingCtorDecls.begin(), 9177 E = DelegatingCtorDecls.end(); 9178 I != E; ++I) { 9179 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9180 } 9181 9182 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9183 (*CI)->setInvalidDecl(); 9184} 9185