SemaDeclCXX.cpp revision 82713174914bdb927a254c5ee188e35fd79c4948
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 if (!Record->isDependentType()) 3001 CheckExplicitlyDefaultedMethods(Record); 3002} 3003 3004void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3005 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3006 ME = Record->method_end(); 3007 MI != ME; ++MI) { 3008 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3009 switch (getSpecialMember(*MI)) { 3010 case CXXDefaultConstructor: 3011 CheckExplicitlyDefaultedDefaultConstructor( 3012 cast<CXXConstructorDecl>(*MI)); 3013 break; 3014 3015 case CXXDestructor: 3016 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3017 break; 3018 3019 case CXXCopyConstructor: 3020 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3021 break; 3022 3023 case CXXCopyAssignment: 3024 CheckExplicitlyDefaultedCopyAssignment(*MI); 3025 break; 3026 3027 case CXXMoveConstructor: 3028 case CXXMoveAssignment: 3029 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3030 break; 3031 3032 default: 3033 // FIXME: Do moves once they exist 3034 llvm_unreachable("non-special member explicitly defaulted!"); 3035 } 3036 } 3037 } 3038 3039} 3040 3041void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3042 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3043 3044 // Whether this was the first-declared instance of the constructor. 3045 // This affects whether we implicitly add an exception spec (and, eventually, 3046 // constexpr). It is also ill-formed to explicitly default a constructor such 3047 // that it would be deleted. (C++0x [decl.fct.def.default]) 3048 bool First = CD == CD->getCanonicalDecl(); 3049 3050 bool HadError = false; 3051 if (CD->getNumParams() != 0) { 3052 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3053 << CD->getSourceRange(); 3054 HadError = true; 3055 } 3056 3057 ImplicitExceptionSpecification Spec 3058 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3059 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3060 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3061 *ExceptionType = Context.getFunctionType( 3062 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3063 3064 if (CtorType->hasExceptionSpec()) { 3065 if (CheckEquivalentExceptionSpec( 3066 PDiag(diag::err_incorrect_defaulted_exception_spec) 3067 << CXXDefaultConstructor, 3068 PDiag(), 3069 ExceptionType, SourceLocation(), 3070 CtorType, CD->getLocation())) { 3071 HadError = true; 3072 } 3073 } else if (First) { 3074 // We set the declaration to have the computed exception spec here. 3075 // We know there are no parameters. 3076 EPI.ExtInfo = CtorType->getExtInfo(); 3077 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3078 } 3079 3080 if (HadError) { 3081 CD->setInvalidDecl(); 3082 return; 3083 } 3084 3085 if (ShouldDeleteDefaultConstructor(CD)) { 3086 if (First) { 3087 CD->setDeletedAsWritten(); 3088 } else { 3089 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3090 << CXXDefaultConstructor; 3091 CD->setInvalidDecl(); 3092 } 3093 } 3094} 3095 3096void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3097 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3098 3099 // Whether this was the first-declared instance of the constructor. 3100 bool First = CD == CD->getCanonicalDecl(); 3101 3102 bool HadError = false; 3103 if (CD->getNumParams() != 1) { 3104 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3105 << CD->getSourceRange(); 3106 HadError = true; 3107 } 3108 3109 ImplicitExceptionSpecification Spec(Context); 3110 bool Const; 3111 llvm::tie(Spec, Const) = 3112 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3113 3114 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3115 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3116 *ExceptionType = Context.getFunctionType( 3117 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3118 3119 // Check for parameter type matching. 3120 // This is a copy ctor so we know it's a cv-qualified reference to T. 3121 QualType ArgType = CtorType->getArgType(0); 3122 if (ArgType->getPointeeType().isVolatileQualified()) { 3123 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3124 HadError = true; 3125 } 3126 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3127 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3128 HadError = true; 3129 } 3130 3131 if (CtorType->hasExceptionSpec()) { 3132 if (CheckEquivalentExceptionSpec( 3133 PDiag(diag::err_incorrect_defaulted_exception_spec) 3134 << CXXCopyConstructor, 3135 PDiag(), 3136 ExceptionType, SourceLocation(), 3137 CtorType, CD->getLocation())) { 3138 HadError = true; 3139 } 3140 } else if (First) { 3141 // We set the declaration to have the computed exception spec here. 3142 // We duplicate the one parameter type. 3143 EPI.ExtInfo = CtorType->getExtInfo(); 3144 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3145 } 3146 3147 if (HadError) { 3148 CD->setInvalidDecl(); 3149 return; 3150 } 3151 3152 if (ShouldDeleteCopyConstructor(CD)) { 3153 if (First) { 3154 CD->setDeletedAsWritten(); 3155 } else { 3156 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3157 << CXXCopyConstructor; 3158 CD->setInvalidDecl(); 3159 } 3160 } 3161} 3162 3163void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3164 assert(MD->isExplicitlyDefaulted()); 3165 3166 // Whether this was the first-declared instance of the operator 3167 bool First = MD == MD->getCanonicalDecl(); 3168 3169 bool HadError = false; 3170 if (MD->getNumParams() != 1) { 3171 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3172 << MD->getSourceRange(); 3173 HadError = true; 3174 } 3175 3176 QualType ReturnType = 3177 MD->getType()->getAs<FunctionType>()->getResultType(); 3178 if (!ReturnType->isLValueReferenceType() || 3179 !Context.hasSameType( 3180 Context.getCanonicalType(ReturnType->getPointeeType()), 3181 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3182 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3183 HadError = true; 3184 } 3185 3186 ImplicitExceptionSpecification Spec(Context); 3187 bool Const; 3188 llvm::tie(Spec, Const) = 3189 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3190 3191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3192 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3193 *ExceptionType = Context.getFunctionType( 3194 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3195 3196 QualType ArgType = OperType->getArgType(0); 3197 if (!ArgType->isReferenceType()) { 3198 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3199 HadError = true; 3200 } else { 3201 if (ArgType->getPointeeType().isVolatileQualified()) { 3202 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3203 HadError = true; 3204 } 3205 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3206 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3207 HadError = true; 3208 } 3209 } 3210 3211 if (OperType->getTypeQuals()) { 3212 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3213 HadError = true; 3214 } 3215 3216 if (OperType->hasExceptionSpec()) { 3217 if (CheckEquivalentExceptionSpec( 3218 PDiag(diag::err_incorrect_defaulted_exception_spec) 3219 << CXXCopyAssignment, 3220 PDiag(), 3221 ExceptionType, SourceLocation(), 3222 OperType, MD->getLocation())) { 3223 HadError = true; 3224 } 3225 } else if (First) { 3226 // We set the declaration to have the computed exception spec here. 3227 // We duplicate the one parameter type. 3228 EPI.RefQualifier = OperType->getRefQualifier(); 3229 EPI.ExtInfo = OperType->getExtInfo(); 3230 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3231 } 3232 3233 if (HadError) { 3234 MD->setInvalidDecl(); 3235 return; 3236 } 3237 3238 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3239 if (First) { 3240 MD->setDeletedAsWritten(); 3241 } else { 3242 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3243 << CXXCopyAssignment; 3244 MD->setInvalidDecl(); 3245 } 3246 } 3247} 3248 3249void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3250 assert(DD->isExplicitlyDefaulted()); 3251 3252 // Whether this was the first-declared instance of the destructor. 3253 bool First = DD == DD->getCanonicalDecl(); 3254 3255 ImplicitExceptionSpecification Spec 3256 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3257 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3258 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3259 *ExceptionType = Context.getFunctionType( 3260 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3261 3262 if (DtorType->hasExceptionSpec()) { 3263 if (CheckEquivalentExceptionSpec( 3264 PDiag(diag::err_incorrect_defaulted_exception_spec) 3265 << CXXDestructor, 3266 PDiag(), 3267 ExceptionType, SourceLocation(), 3268 DtorType, DD->getLocation())) { 3269 DD->setInvalidDecl(); 3270 return; 3271 } 3272 } else if (First) { 3273 // We set the declaration to have the computed exception spec here. 3274 // There are no parameters. 3275 EPI.ExtInfo = DtorType->getExtInfo(); 3276 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3277 } 3278 3279 if (ShouldDeleteDestructor(DD)) { 3280 if (First) { 3281 DD->setDeletedAsWritten(); 3282 } else { 3283 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3284 << CXXDestructor; 3285 DD->setInvalidDecl(); 3286 } 3287 } 3288} 3289 3290bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3291 CXXRecordDecl *RD = CD->getParent(); 3292 assert(!RD->isDependentType() && "do deletion after instantiation"); 3293 if (!LangOpts.CPlusPlus0x) 3294 return false; 3295 3296 SourceLocation Loc = CD->getLocation(); 3297 3298 // Do access control from the constructor 3299 ContextRAII CtorContext(*this, CD); 3300 3301 bool Union = RD->isUnion(); 3302 bool AllConst = true; 3303 3304 // We do this because we should never actually use an anonymous 3305 // union's constructor. 3306 if (Union && RD->isAnonymousStructOrUnion()) 3307 return false; 3308 3309 // FIXME: We should put some diagnostic logic right into this function. 3310 3311 // C++0x [class.ctor]/5 3312 // A defaulted default constructor for class X is defined as delete if: 3313 3314 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3315 BE = RD->bases_end(); 3316 BI != BE; ++BI) { 3317 // We'll handle this one later 3318 if (BI->isVirtual()) 3319 continue; 3320 3321 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3322 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3323 3324 // -- any [direct base class] has a type with a destructor that is 3325 // delete or inaccessible from the defaulted default constructor 3326 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3327 if (BaseDtor->isDeleted()) 3328 return true; 3329 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3330 AR_accessible) 3331 return true; 3332 3333 // -- any [direct base class either] has no default constructor or 3334 // overload resolution as applied to [its] default constructor 3335 // results in an ambiguity or in a function that is deleted or 3336 // inaccessible from the defaulted default constructor 3337 InitializedEntity BaseEntity = 3338 InitializedEntity::InitializeBase(Context, BI, 0); 3339 InitializationKind Kind = 3340 InitializationKind::CreateDirect(Loc, Loc, Loc); 3341 3342 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3343 3344 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3345 return true; 3346 } 3347 3348 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3349 BE = RD->vbases_end(); 3350 BI != BE; ++BI) { 3351 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3352 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3353 3354 // -- any [virtual base class] has a type with a destructor that is 3355 // delete or inaccessible from the defaulted default constructor 3356 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3357 if (BaseDtor->isDeleted()) 3358 return true; 3359 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3360 AR_accessible) 3361 return true; 3362 3363 // -- any [virtual base class either] has no default constructor or 3364 // overload resolution as applied to [its] default constructor 3365 // results in an ambiguity or in a function that is deleted or 3366 // inaccessible from the defaulted default constructor 3367 InitializedEntity BaseEntity = 3368 InitializedEntity::InitializeBase(Context, BI, BI); 3369 InitializationKind Kind = 3370 InitializationKind::CreateDirect(Loc, Loc, Loc); 3371 3372 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3373 3374 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3375 return true; 3376 } 3377 3378 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3379 FE = RD->field_end(); 3380 FI != FE; ++FI) { 3381 QualType FieldType = Context.getBaseElementType(FI->getType()); 3382 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3383 3384 // -- any non-static data member with no brace-or-equal-initializer is of 3385 // reference type 3386 if (FieldType->isReferenceType()) 3387 return true; 3388 3389 // -- X is a union and all its variant members are of const-qualified type 3390 // (or array thereof) 3391 if (Union && !FieldType.isConstQualified()) 3392 AllConst = false; 3393 3394 if (FieldRecord) { 3395 // -- X is a union-like class that has a variant member with a non-trivial 3396 // default constructor 3397 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3398 return true; 3399 3400 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3401 if (FieldDtor->isDeleted()) 3402 return true; 3403 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3404 AR_accessible) 3405 return true; 3406 3407 // -- any non-variant non-static data member of const-qualified type (or 3408 // array thereof) with no brace-or-equal-initializer does not have a 3409 // user-provided default constructor 3410 if (FieldType.isConstQualified() && 3411 !FieldRecord->hasUserProvidedDefaultConstructor()) 3412 return true; 3413 3414 if (!Union && FieldRecord->isUnion() && 3415 FieldRecord->isAnonymousStructOrUnion()) { 3416 // We're okay to reuse AllConst here since we only care about the 3417 // value otherwise if we're in a union. 3418 AllConst = true; 3419 3420 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3421 UE = FieldRecord->field_end(); 3422 UI != UE; ++UI) { 3423 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3424 CXXRecordDecl *UnionFieldRecord = 3425 UnionFieldType->getAsCXXRecordDecl(); 3426 3427 if (!UnionFieldType.isConstQualified()) 3428 AllConst = false; 3429 3430 if (UnionFieldRecord && 3431 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3432 return true; 3433 } 3434 3435 if (AllConst) 3436 return true; 3437 3438 // Don't try to initialize the anonymous union 3439 // This is technically non-conformant, but sanity demands it. 3440 continue; 3441 } 3442 } else if (!Union && FieldType.isConstQualified()) { 3443 // -- any non-variant non-static data member of const-qualified type (or 3444 // array thereof) with no brace-or-equal-initializer does not have a 3445 // user-provided default constructor 3446 return true; 3447 } 3448 3449 InitializedEntity MemberEntity = 3450 InitializedEntity::InitializeMember(*FI, 0); 3451 InitializationKind Kind = 3452 InitializationKind::CreateDirect(Loc, Loc, Loc); 3453 3454 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3455 3456 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3457 return true; 3458 } 3459 3460 if (Union && AllConst) 3461 return true; 3462 3463 return false; 3464} 3465 3466bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3467 CXXRecordDecl *RD = CD->getParent(); 3468 assert(!RD->isDependentType() && "do deletion after instantiation"); 3469 if (!LangOpts.CPlusPlus0x) 3470 return false; 3471 3472 SourceLocation Loc = CD->getLocation(); 3473 3474 // Do access control from the constructor 3475 ContextRAII CtorContext(*this, CD); 3476 3477 bool Union = RD->isUnion(); 3478 3479 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3480 "copy assignment arg has no pointee type"); 3481 bool ConstArg = 3482 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3483 3484 // We do this because we should never actually use an anonymous 3485 // union's constructor. 3486 if (Union && RD->isAnonymousStructOrUnion()) 3487 return false; 3488 3489 // FIXME: We should put some diagnostic logic right into this function. 3490 3491 // C++0x [class.copy]/11 3492 // A defaulted [copy] constructor for class X is defined as delete if X has: 3493 3494 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3495 BE = RD->bases_end(); 3496 BI != BE; ++BI) { 3497 // We'll handle this one later 3498 if (BI->isVirtual()) 3499 continue; 3500 3501 QualType BaseType = BI->getType(); 3502 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3503 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3504 3505 // -- any [direct base class] of a type with a destructor that is deleted or 3506 // inaccessible from the defaulted constructor 3507 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3508 if (BaseDtor->isDeleted()) 3509 return true; 3510 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3511 AR_accessible) 3512 return true; 3513 3514 // -- a [direct base class] B that cannot be [copied] because overload 3515 // resolution, as applied to B's [copy] constructor, results in an 3516 // ambiguity or a function that is deleted or inaccessible from the 3517 // defaulted constructor 3518 InitializedEntity BaseEntity = 3519 InitializedEntity::InitializeBase(Context, BI, 0); 3520 InitializationKind Kind = 3521 InitializationKind::CreateDirect(Loc, Loc, Loc); 3522 3523 // Construct a fake expression to perform the copy overloading. 3524 QualType ArgType = BaseType.getUnqualifiedType(); 3525 if (ConstArg) 3526 ArgType.addConst(); 3527 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3528 3529 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3530 3531 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3532 return true; 3533 } 3534 3535 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3536 BE = RD->vbases_end(); 3537 BI != BE; ++BI) { 3538 QualType BaseType = BI->getType(); 3539 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3540 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3541 3542 // -- any [direct base class] of a type with a destructor that is deleted or 3543 // inaccessible from the defaulted constructor 3544 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3545 if (BaseDtor->isDeleted()) 3546 return true; 3547 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3548 AR_accessible) 3549 return true; 3550 3551 // -- a [virtual base class] B that cannot be [copied] because overload 3552 // resolution, as applied to B's [copy] constructor, results in an 3553 // ambiguity or a function that is deleted or inaccessible from the 3554 // defaulted constructor 3555 InitializedEntity BaseEntity = 3556 InitializedEntity::InitializeBase(Context, BI, BI); 3557 InitializationKind Kind = 3558 InitializationKind::CreateDirect(Loc, Loc, Loc); 3559 3560 // Construct a fake expression to perform the copy overloading. 3561 QualType ArgType = BaseType.getUnqualifiedType(); 3562 if (ConstArg) 3563 ArgType.addConst(); 3564 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3565 3566 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3567 3568 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3569 return true; 3570 } 3571 3572 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3573 FE = RD->field_end(); 3574 FI != FE; ++FI) { 3575 QualType FieldType = Context.getBaseElementType(FI->getType()); 3576 3577 // -- for a copy constructor, a non-static data member of rvalue reference 3578 // type 3579 if (FieldType->isRValueReferenceType()) 3580 return true; 3581 3582 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3583 3584 if (FieldRecord) { 3585 // This is an anonymous union 3586 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3587 // Anonymous unions inside unions do not variant members create 3588 if (!Union) { 3589 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3590 UE = FieldRecord->field_end(); 3591 UI != UE; ++UI) { 3592 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3593 CXXRecordDecl *UnionFieldRecord = 3594 UnionFieldType->getAsCXXRecordDecl(); 3595 3596 // -- a variant member with a non-trivial [copy] constructor and X 3597 // is a union-like class 3598 if (UnionFieldRecord && 3599 !UnionFieldRecord->hasTrivialCopyConstructor()) 3600 return true; 3601 } 3602 } 3603 3604 // Don't try to initalize an anonymous union 3605 continue; 3606 } else { 3607 // -- a variant member with a non-trivial [copy] constructor and X is a 3608 // union-like class 3609 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3610 return true; 3611 3612 // -- any [non-static data member] of a type with a destructor that is 3613 // deleted or inaccessible from the defaulted constructor 3614 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3615 if (FieldDtor->isDeleted()) 3616 return true; 3617 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3618 AR_accessible) 3619 return true; 3620 } 3621 } 3622 3623 llvm::SmallVector<InitializedEntity, 4> Entities; 3624 QualType CurType = FI->getType(); 3625 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3626 while (CurType->isArrayType()) { 3627 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3628 Entities.back())); 3629 CurType = Context.getAsArrayType(CurType)->getElementType(); 3630 } 3631 3632 InitializationKind Kind = 3633 InitializationKind::CreateDirect(Loc, Loc, Loc); 3634 3635 // Construct a fake expression to perform the copy overloading. 3636 QualType ArgType = FieldType; 3637 if (ArgType->isReferenceType()) 3638 ArgType = ArgType->getPointeeType(); 3639 else if (ConstArg) 3640 ArgType.addConst(); 3641 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3642 3643 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3644 3645 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3646 return true; 3647 } 3648 3649 return false; 3650} 3651 3652bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3653 CXXRecordDecl *RD = MD->getParent(); 3654 assert(!RD->isDependentType() && "do deletion after instantiation"); 3655 if (!LangOpts.CPlusPlus0x) 3656 return false; 3657 3658 SourceLocation Loc = MD->getLocation(); 3659 3660 // Do access control from the constructor 3661 ContextRAII MethodContext(*this, MD); 3662 3663 bool Union = RD->isUnion(); 3664 3665 bool ConstArg = 3666 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3667 3668 // We do this because we should never actually use an anonymous 3669 // union's constructor. 3670 if (Union && RD->isAnonymousStructOrUnion()) 3671 return false; 3672 3673 DeclarationName OperatorName = 3674 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3675 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3676 R.suppressDiagnostics(); 3677 3678 // FIXME: We should put some diagnostic logic right into this function. 3679 3680 // C++0x [class.copy]/11 3681 // A defaulted [copy] assignment operator for class X is defined as deleted 3682 // if X has: 3683 3684 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3685 BE = RD->bases_end(); 3686 BI != BE; ++BI) { 3687 // We'll handle this one later 3688 if (BI->isVirtual()) 3689 continue; 3690 3691 QualType BaseType = BI->getType(); 3692 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3693 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3694 3695 // -- a [direct base class] B that cannot be [copied] because overload 3696 // resolution, as applied to B's [copy] assignment operator, results in 3697 // an ambiguity or a function that is deleted or inaccessible from the 3698 // assignment operator 3699 3700 LookupQualifiedName(R, BaseDecl, false); 3701 3702 // Filter out any result that isn't a copy-assignment operator. 3703 LookupResult::Filter F = R.makeFilter(); 3704 while (F.hasNext()) { 3705 NamedDecl *D = F.next(); 3706 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3707 if (Method->isCopyAssignmentOperator()) 3708 continue; 3709 3710 F.erase(); 3711 } 3712 F.done(); 3713 3714 // Build a fake argument expression 3715 QualType ArgType = BaseType; 3716 QualType ThisType = BaseType; 3717 if (ConstArg) 3718 ArgType.addConst(); 3719 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3720 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3721 }; 3722 3723 OverloadCandidateSet OCS((Loc)); 3724 OverloadCandidateSet::iterator Best; 3725 3726 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3727 3728 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3729 OR_Success) 3730 return true; 3731 } 3732 3733 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3734 BE = RD->vbases_end(); 3735 BI != BE; ++BI) { 3736 QualType BaseType = BI->getType(); 3737 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3738 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3739 3740 // -- a [virtual base class] B that cannot be [copied] because overload 3741 // resolution, as applied to B's [copy] assignment operator, results in 3742 // an ambiguity or a function that is deleted or inaccessible from the 3743 // assignment operator 3744 3745 LookupQualifiedName(R, BaseDecl, false); 3746 3747 // Filter out any result that isn't a copy-assignment operator. 3748 LookupResult::Filter F = R.makeFilter(); 3749 while (F.hasNext()) { 3750 NamedDecl *D = F.next(); 3751 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3752 if (Method->isCopyAssignmentOperator()) 3753 continue; 3754 3755 F.erase(); 3756 } 3757 F.done(); 3758 3759 // Build a fake argument expression 3760 QualType ArgType = BaseType; 3761 QualType ThisType = BaseType; 3762 if (ConstArg) 3763 ArgType.addConst(); 3764 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3765 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3766 }; 3767 3768 OverloadCandidateSet OCS((Loc)); 3769 OverloadCandidateSet::iterator Best; 3770 3771 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3772 3773 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3774 OR_Success) 3775 return true; 3776 } 3777 3778 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3779 FE = RD->field_end(); 3780 FI != FE; ++FI) { 3781 QualType FieldType = Context.getBaseElementType(FI->getType()); 3782 3783 // -- a non-static data member of reference type 3784 if (FieldType->isReferenceType()) 3785 return true; 3786 3787 // -- a non-static data member of const non-class type (or array thereof) 3788 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3789 return true; 3790 3791 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3792 3793 if (FieldRecord) { 3794 // This is an anonymous union 3795 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3796 // Anonymous unions inside unions do not variant members create 3797 if (!Union) { 3798 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3799 UE = FieldRecord->field_end(); 3800 UI != UE; ++UI) { 3801 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3802 CXXRecordDecl *UnionFieldRecord = 3803 UnionFieldType->getAsCXXRecordDecl(); 3804 3805 // -- a variant member with a non-trivial [copy] assignment operator 3806 // and X is a union-like class 3807 if (UnionFieldRecord && 3808 !UnionFieldRecord->hasTrivialCopyAssignment()) 3809 return true; 3810 } 3811 } 3812 3813 // Don't try to initalize an anonymous union 3814 continue; 3815 // -- a variant member with a non-trivial [copy] assignment operator 3816 // and X is a union-like class 3817 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3818 return true; 3819 } 3820 3821 LookupQualifiedName(R, FieldRecord, false); 3822 3823 // Filter out any result that isn't a copy-assignment operator. 3824 LookupResult::Filter F = R.makeFilter(); 3825 while (F.hasNext()) { 3826 NamedDecl *D = F.next(); 3827 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3828 if (Method->isCopyAssignmentOperator()) 3829 continue; 3830 3831 F.erase(); 3832 } 3833 F.done(); 3834 3835 // Build a fake argument expression 3836 QualType ArgType = FieldType; 3837 QualType ThisType = FieldType; 3838 if (ConstArg) 3839 ArgType.addConst(); 3840 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3841 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3842 }; 3843 3844 OverloadCandidateSet OCS((Loc)); 3845 OverloadCandidateSet::iterator Best; 3846 3847 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3848 3849 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3850 OR_Success) 3851 return true; 3852 } 3853 } 3854 3855 return false; 3856} 3857 3858bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3859 CXXRecordDecl *RD = DD->getParent(); 3860 assert(!RD->isDependentType() && "do deletion after instantiation"); 3861 if (!LangOpts.CPlusPlus0x) 3862 return false; 3863 3864 SourceLocation Loc = DD->getLocation(); 3865 3866 // Do access control from the destructor 3867 ContextRAII CtorContext(*this, DD); 3868 3869 bool Union = RD->isUnion(); 3870 3871 // We do this because we should never actually use an anonymous 3872 // union's destructor. 3873 if (Union && RD->isAnonymousStructOrUnion()) 3874 return false; 3875 3876 // C++0x [class.dtor]p5 3877 // A defaulted destructor for a class X is defined as deleted if: 3878 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3879 BE = RD->bases_end(); 3880 BI != BE; ++BI) { 3881 // We'll handle this one later 3882 if (BI->isVirtual()) 3883 continue; 3884 3885 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3886 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3887 assert(BaseDtor && "base has no destructor"); 3888 3889 // -- any direct or virtual base class has a deleted destructor or 3890 // a destructor that is inaccessible from the defaulted destructor 3891 if (BaseDtor->isDeleted()) 3892 return true; 3893 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3894 AR_accessible) 3895 return true; 3896 } 3897 3898 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3899 BE = RD->vbases_end(); 3900 BI != BE; ++BI) { 3901 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3902 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3903 assert(BaseDtor && "base has no destructor"); 3904 3905 // -- any direct or virtual base class has a deleted destructor or 3906 // a destructor that is inaccessible from the defaulted destructor 3907 if (BaseDtor->isDeleted()) 3908 return true; 3909 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3910 AR_accessible) 3911 return true; 3912 } 3913 3914 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3915 FE = RD->field_end(); 3916 FI != FE; ++FI) { 3917 QualType FieldType = Context.getBaseElementType(FI->getType()); 3918 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3919 if (FieldRecord) { 3920 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3921 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3922 UE = FieldRecord->field_end(); 3923 UI != UE; ++UI) { 3924 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3925 CXXRecordDecl *UnionFieldRecord = 3926 UnionFieldType->getAsCXXRecordDecl(); 3927 3928 // -- X is a union-like class that has a variant member with a non- 3929 // trivial destructor. 3930 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3931 return true; 3932 } 3933 // Technically we are supposed to do this next check unconditionally. 3934 // But that makes absolutely no sense. 3935 } else { 3936 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3937 3938 // -- any of the non-static data members has class type M (or array 3939 // thereof) and M has a deleted destructor or a destructor that is 3940 // inaccessible from the defaulted destructor 3941 if (FieldDtor->isDeleted()) 3942 return true; 3943 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3944 AR_accessible) 3945 return true; 3946 3947 // -- X is a union-like class that has a variant member with a non- 3948 // trivial destructor. 3949 if (Union && !FieldDtor->isTrivial()) 3950 return true; 3951 } 3952 } 3953 } 3954 3955 if (DD->isVirtual()) { 3956 FunctionDecl *OperatorDelete = 0; 3957 DeclarationName Name = 3958 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3959 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3960 false)) 3961 return true; 3962 } 3963 3964 3965 return false; 3966} 3967 3968/// \brief Data used with FindHiddenVirtualMethod 3969namespace { 3970 struct FindHiddenVirtualMethodData { 3971 Sema *S; 3972 CXXMethodDecl *Method; 3973 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3974 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3975 }; 3976} 3977 3978/// \brief Member lookup function that determines whether a given C++ 3979/// method overloads virtual methods in a base class without overriding any, 3980/// to be used with CXXRecordDecl::lookupInBases(). 3981static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3982 CXXBasePath &Path, 3983 void *UserData) { 3984 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3985 3986 FindHiddenVirtualMethodData &Data 3987 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3988 3989 DeclarationName Name = Data.Method->getDeclName(); 3990 assert(Name.getNameKind() == DeclarationName::Identifier); 3991 3992 bool foundSameNameMethod = false; 3993 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3994 for (Path.Decls = BaseRecord->lookup(Name); 3995 Path.Decls.first != Path.Decls.second; 3996 ++Path.Decls.first) { 3997 NamedDecl *D = *Path.Decls.first; 3998 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3999 MD = MD->getCanonicalDecl(); 4000 foundSameNameMethod = true; 4001 // Interested only in hidden virtual methods. 4002 if (!MD->isVirtual()) 4003 continue; 4004 // If the method we are checking overrides a method from its base 4005 // don't warn about the other overloaded methods. 4006 if (!Data.S->IsOverload(Data.Method, MD, false)) 4007 return true; 4008 // Collect the overload only if its hidden. 4009 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4010 overloadedMethods.push_back(MD); 4011 } 4012 } 4013 4014 if (foundSameNameMethod) 4015 Data.OverloadedMethods.append(overloadedMethods.begin(), 4016 overloadedMethods.end()); 4017 return foundSameNameMethod; 4018} 4019 4020/// \brief See if a method overloads virtual methods in a base class without 4021/// overriding any. 4022void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4023 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4024 MD->getLocation()) == Diagnostic::Ignored) 4025 return; 4026 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4027 return; 4028 4029 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4030 /*bool RecordPaths=*/false, 4031 /*bool DetectVirtual=*/false); 4032 FindHiddenVirtualMethodData Data; 4033 Data.Method = MD; 4034 Data.S = this; 4035 4036 // Keep the base methods that were overriden or introduced in the subclass 4037 // by 'using' in a set. A base method not in this set is hidden. 4038 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4039 res.first != res.second; ++res.first) { 4040 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4041 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4042 E = MD->end_overridden_methods(); 4043 I != E; ++I) 4044 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4045 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4046 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4047 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4048 } 4049 4050 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4051 !Data.OverloadedMethods.empty()) { 4052 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4053 << MD << (Data.OverloadedMethods.size() > 1); 4054 4055 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4056 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4057 Diag(overloadedMD->getLocation(), 4058 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4059 } 4060 } 4061} 4062 4063void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4064 Decl *TagDecl, 4065 SourceLocation LBrac, 4066 SourceLocation RBrac, 4067 AttributeList *AttrList) { 4068 if (!TagDecl) 4069 return; 4070 4071 AdjustDeclIfTemplate(TagDecl); 4072 4073 ActOnFields(S, RLoc, TagDecl, 4074 // strict aliasing violation! 4075 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4076 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4077 4078 CheckCompletedCXXClass( 4079 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4080} 4081 4082/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4083/// special functions, such as the default constructor, copy 4084/// constructor, or destructor, to the given C++ class (C++ 4085/// [special]p1). This routine can only be executed just before the 4086/// definition of the class is complete. 4087void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4088 if (!ClassDecl->hasUserDeclaredConstructor()) 4089 ++ASTContext::NumImplicitDefaultConstructors; 4090 4091 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4092 ++ASTContext::NumImplicitCopyConstructors; 4093 4094 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4095 ++ASTContext::NumImplicitCopyAssignmentOperators; 4096 4097 // If we have a dynamic class, then the copy assignment operator may be 4098 // virtual, so we have to declare it immediately. This ensures that, e.g., 4099 // it shows up in the right place in the vtable and that we diagnose 4100 // problems with the implicit exception specification. 4101 if (ClassDecl->isDynamicClass()) 4102 DeclareImplicitCopyAssignment(ClassDecl); 4103 } 4104 4105 if (!ClassDecl->hasUserDeclaredDestructor()) { 4106 ++ASTContext::NumImplicitDestructors; 4107 4108 // If we have a dynamic class, then the destructor may be virtual, so we 4109 // have to declare the destructor immediately. This ensures that, e.g., it 4110 // shows up in the right place in the vtable and that we diagnose problems 4111 // with the implicit exception specification. 4112 if (ClassDecl->isDynamicClass()) 4113 DeclareImplicitDestructor(ClassDecl); 4114 } 4115} 4116 4117void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4118 if (!D) 4119 return; 4120 4121 int NumParamList = D->getNumTemplateParameterLists(); 4122 for (int i = 0; i < NumParamList; i++) { 4123 TemplateParameterList* Params = D->getTemplateParameterList(i); 4124 for (TemplateParameterList::iterator Param = Params->begin(), 4125 ParamEnd = Params->end(); 4126 Param != ParamEnd; ++Param) { 4127 NamedDecl *Named = cast<NamedDecl>(*Param); 4128 if (Named->getDeclName()) { 4129 S->AddDecl(Named); 4130 IdResolver.AddDecl(Named); 4131 } 4132 } 4133 } 4134} 4135 4136void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4137 if (!D) 4138 return; 4139 4140 TemplateParameterList *Params = 0; 4141 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4142 Params = Template->getTemplateParameters(); 4143 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4144 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4145 Params = PartialSpec->getTemplateParameters(); 4146 else 4147 return; 4148 4149 for (TemplateParameterList::iterator Param = Params->begin(), 4150 ParamEnd = Params->end(); 4151 Param != ParamEnd; ++Param) { 4152 NamedDecl *Named = cast<NamedDecl>(*Param); 4153 if (Named->getDeclName()) { 4154 S->AddDecl(Named); 4155 IdResolver.AddDecl(Named); 4156 } 4157 } 4158} 4159 4160void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4161 if (!RecordD) return; 4162 AdjustDeclIfTemplate(RecordD); 4163 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4164 PushDeclContext(S, Record); 4165} 4166 4167void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4168 if (!RecordD) return; 4169 PopDeclContext(); 4170} 4171 4172/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4173/// parsing a top-level (non-nested) C++ class, and we are now 4174/// parsing those parts of the given Method declaration that could 4175/// not be parsed earlier (C++ [class.mem]p2), such as default 4176/// arguments. This action should enter the scope of the given 4177/// Method declaration as if we had just parsed the qualified method 4178/// name. However, it should not bring the parameters into scope; 4179/// that will be performed by ActOnDelayedCXXMethodParameter. 4180void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4181} 4182 4183/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4184/// C++ method declaration. We're (re-)introducing the given 4185/// function parameter into scope for use in parsing later parts of 4186/// the method declaration. For example, we could see an 4187/// ActOnParamDefaultArgument event for this parameter. 4188void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4189 if (!ParamD) 4190 return; 4191 4192 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4193 4194 // If this parameter has an unparsed default argument, clear it out 4195 // to make way for the parsed default argument. 4196 if (Param->hasUnparsedDefaultArg()) 4197 Param->setDefaultArg(0); 4198 4199 S->AddDecl(Param); 4200 if (Param->getDeclName()) 4201 IdResolver.AddDecl(Param); 4202} 4203 4204/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4205/// processing the delayed method declaration for Method. The method 4206/// declaration is now considered finished. There may be a separate 4207/// ActOnStartOfFunctionDef action later (not necessarily 4208/// immediately!) for this method, if it was also defined inside the 4209/// class body. 4210void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4211 if (!MethodD) 4212 return; 4213 4214 AdjustDeclIfTemplate(MethodD); 4215 4216 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4217 4218 // Now that we have our default arguments, check the constructor 4219 // again. It could produce additional diagnostics or affect whether 4220 // the class has implicitly-declared destructors, among other 4221 // things. 4222 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4223 CheckConstructor(Constructor); 4224 4225 // Check the default arguments, which we may have added. 4226 if (!Method->isInvalidDecl()) 4227 CheckCXXDefaultArguments(Method); 4228} 4229 4230/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4231/// the well-formedness of the constructor declarator @p D with type @p 4232/// R. If there are any errors in the declarator, this routine will 4233/// emit diagnostics and set the invalid bit to true. In any case, the type 4234/// will be updated to reflect a well-formed type for the constructor and 4235/// returned. 4236QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4237 StorageClass &SC) { 4238 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4239 4240 // C++ [class.ctor]p3: 4241 // A constructor shall not be virtual (10.3) or static (9.4). A 4242 // constructor can be invoked for a const, volatile or const 4243 // volatile object. A constructor shall not be declared const, 4244 // volatile, or const volatile (9.3.2). 4245 if (isVirtual) { 4246 if (!D.isInvalidType()) 4247 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4248 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4249 << SourceRange(D.getIdentifierLoc()); 4250 D.setInvalidType(); 4251 } 4252 if (SC == SC_Static) { 4253 if (!D.isInvalidType()) 4254 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4255 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4256 << SourceRange(D.getIdentifierLoc()); 4257 D.setInvalidType(); 4258 SC = SC_None; 4259 } 4260 4261 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4262 if (FTI.TypeQuals != 0) { 4263 if (FTI.TypeQuals & Qualifiers::Const) 4264 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4265 << "const" << SourceRange(D.getIdentifierLoc()); 4266 if (FTI.TypeQuals & Qualifiers::Volatile) 4267 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4268 << "volatile" << SourceRange(D.getIdentifierLoc()); 4269 if (FTI.TypeQuals & Qualifiers::Restrict) 4270 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4271 << "restrict" << SourceRange(D.getIdentifierLoc()); 4272 D.setInvalidType(); 4273 } 4274 4275 // C++0x [class.ctor]p4: 4276 // A constructor shall not be declared with a ref-qualifier. 4277 if (FTI.hasRefQualifier()) { 4278 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4279 << FTI.RefQualifierIsLValueRef 4280 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4281 D.setInvalidType(); 4282 } 4283 4284 // Rebuild the function type "R" without any type qualifiers (in 4285 // case any of the errors above fired) and with "void" as the 4286 // return type, since constructors don't have return types. 4287 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4288 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4289 return R; 4290 4291 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4292 EPI.TypeQuals = 0; 4293 EPI.RefQualifier = RQ_None; 4294 4295 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4296 Proto->getNumArgs(), EPI); 4297} 4298 4299/// CheckConstructor - Checks a fully-formed constructor for 4300/// well-formedness, issuing any diagnostics required. Returns true if 4301/// the constructor declarator is invalid. 4302void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4303 CXXRecordDecl *ClassDecl 4304 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4305 if (!ClassDecl) 4306 return Constructor->setInvalidDecl(); 4307 4308 // C++ [class.copy]p3: 4309 // A declaration of a constructor for a class X is ill-formed if 4310 // its first parameter is of type (optionally cv-qualified) X and 4311 // either there are no other parameters or else all other 4312 // parameters have default arguments. 4313 if (!Constructor->isInvalidDecl() && 4314 ((Constructor->getNumParams() == 1) || 4315 (Constructor->getNumParams() > 1 && 4316 Constructor->getParamDecl(1)->hasDefaultArg())) && 4317 Constructor->getTemplateSpecializationKind() 4318 != TSK_ImplicitInstantiation) { 4319 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4320 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4321 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4322 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4323 const char *ConstRef 4324 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4325 : " const &"; 4326 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4327 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4328 4329 // FIXME: Rather that making the constructor invalid, we should endeavor 4330 // to fix the type. 4331 Constructor->setInvalidDecl(); 4332 } 4333 } 4334} 4335 4336/// CheckDestructor - Checks a fully-formed destructor definition for 4337/// well-formedness, issuing any diagnostics required. Returns true 4338/// on error. 4339bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4340 CXXRecordDecl *RD = Destructor->getParent(); 4341 4342 if (Destructor->isVirtual()) { 4343 SourceLocation Loc; 4344 4345 if (!Destructor->isImplicit()) 4346 Loc = Destructor->getLocation(); 4347 else 4348 Loc = RD->getLocation(); 4349 4350 // If we have a virtual destructor, look up the deallocation function 4351 FunctionDecl *OperatorDelete = 0; 4352 DeclarationName Name = 4353 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4354 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4355 return true; 4356 4357 MarkDeclarationReferenced(Loc, OperatorDelete); 4358 4359 Destructor->setOperatorDelete(OperatorDelete); 4360 } 4361 4362 return false; 4363} 4364 4365static inline bool 4366FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4367 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4368 FTI.ArgInfo[0].Param && 4369 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4370} 4371 4372/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4373/// the well-formednes of the destructor declarator @p D with type @p 4374/// R. If there are any errors in the declarator, this routine will 4375/// emit diagnostics and set the declarator to invalid. Even if this happens, 4376/// will be updated to reflect a well-formed type for the destructor and 4377/// returned. 4378QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4379 StorageClass& SC) { 4380 // C++ [class.dtor]p1: 4381 // [...] A typedef-name that names a class is a class-name 4382 // (7.1.3); however, a typedef-name that names a class shall not 4383 // be used as the identifier in the declarator for a destructor 4384 // declaration. 4385 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4386 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4387 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4388 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4389 else if (const TemplateSpecializationType *TST = 4390 DeclaratorType->getAs<TemplateSpecializationType>()) 4391 if (TST->isTypeAlias()) 4392 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4393 << DeclaratorType << 1; 4394 4395 // C++ [class.dtor]p2: 4396 // A destructor is used to destroy objects of its class type. A 4397 // destructor takes no parameters, and no return type can be 4398 // specified for it (not even void). The address of a destructor 4399 // shall not be taken. A destructor shall not be static. A 4400 // destructor can be invoked for a const, volatile or const 4401 // volatile object. A destructor shall not be declared const, 4402 // volatile or const volatile (9.3.2). 4403 if (SC == SC_Static) { 4404 if (!D.isInvalidType()) 4405 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4406 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4407 << SourceRange(D.getIdentifierLoc()) 4408 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4409 4410 SC = SC_None; 4411 } 4412 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4413 // Destructors don't have return types, but the parser will 4414 // happily parse something like: 4415 // 4416 // class X { 4417 // float ~X(); 4418 // }; 4419 // 4420 // The return type will be eliminated later. 4421 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4422 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4423 << SourceRange(D.getIdentifierLoc()); 4424 } 4425 4426 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4427 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4428 if (FTI.TypeQuals & Qualifiers::Const) 4429 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4430 << "const" << SourceRange(D.getIdentifierLoc()); 4431 if (FTI.TypeQuals & Qualifiers::Volatile) 4432 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4433 << "volatile" << SourceRange(D.getIdentifierLoc()); 4434 if (FTI.TypeQuals & Qualifiers::Restrict) 4435 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4436 << "restrict" << SourceRange(D.getIdentifierLoc()); 4437 D.setInvalidType(); 4438 } 4439 4440 // C++0x [class.dtor]p2: 4441 // A destructor shall not be declared with a ref-qualifier. 4442 if (FTI.hasRefQualifier()) { 4443 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4444 << FTI.RefQualifierIsLValueRef 4445 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4446 D.setInvalidType(); 4447 } 4448 4449 // Make sure we don't have any parameters. 4450 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4451 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4452 4453 // Delete the parameters. 4454 FTI.freeArgs(); 4455 D.setInvalidType(); 4456 } 4457 4458 // Make sure the destructor isn't variadic. 4459 if (FTI.isVariadic) { 4460 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4461 D.setInvalidType(); 4462 } 4463 4464 // Rebuild the function type "R" without any type qualifiers or 4465 // parameters (in case any of the errors above fired) and with 4466 // "void" as the return type, since destructors don't have return 4467 // types. 4468 if (!D.isInvalidType()) 4469 return R; 4470 4471 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4472 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4473 EPI.Variadic = false; 4474 EPI.TypeQuals = 0; 4475 EPI.RefQualifier = RQ_None; 4476 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4477} 4478 4479/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4480/// well-formednes of the conversion function declarator @p D with 4481/// type @p R. If there are any errors in the declarator, this routine 4482/// will emit diagnostics and return true. Otherwise, it will return 4483/// false. Either way, the type @p R will be updated to reflect a 4484/// well-formed type for the conversion operator. 4485void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4486 StorageClass& SC) { 4487 // C++ [class.conv.fct]p1: 4488 // Neither parameter types nor return type can be specified. The 4489 // type of a conversion function (8.3.5) is "function taking no 4490 // parameter returning conversion-type-id." 4491 if (SC == SC_Static) { 4492 if (!D.isInvalidType()) 4493 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4494 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4495 << SourceRange(D.getIdentifierLoc()); 4496 D.setInvalidType(); 4497 SC = SC_None; 4498 } 4499 4500 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4501 4502 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4503 // Conversion functions don't have return types, but the parser will 4504 // happily parse something like: 4505 // 4506 // class X { 4507 // float operator bool(); 4508 // }; 4509 // 4510 // The return type will be changed later anyway. 4511 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4512 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4513 << SourceRange(D.getIdentifierLoc()); 4514 D.setInvalidType(); 4515 } 4516 4517 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4518 4519 // Make sure we don't have any parameters. 4520 if (Proto->getNumArgs() > 0) { 4521 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4522 4523 // Delete the parameters. 4524 D.getFunctionTypeInfo().freeArgs(); 4525 D.setInvalidType(); 4526 } else if (Proto->isVariadic()) { 4527 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4528 D.setInvalidType(); 4529 } 4530 4531 // Diagnose "&operator bool()" and other such nonsense. This 4532 // is actually a gcc extension which we don't support. 4533 if (Proto->getResultType() != ConvType) { 4534 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4535 << Proto->getResultType(); 4536 D.setInvalidType(); 4537 ConvType = Proto->getResultType(); 4538 } 4539 4540 // C++ [class.conv.fct]p4: 4541 // The conversion-type-id shall not represent a function type nor 4542 // an array type. 4543 if (ConvType->isArrayType()) { 4544 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4545 ConvType = Context.getPointerType(ConvType); 4546 D.setInvalidType(); 4547 } else if (ConvType->isFunctionType()) { 4548 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4549 ConvType = Context.getPointerType(ConvType); 4550 D.setInvalidType(); 4551 } 4552 4553 // Rebuild the function type "R" without any parameters (in case any 4554 // of the errors above fired) and with the conversion type as the 4555 // return type. 4556 if (D.isInvalidType()) 4557 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4558 4559 // C++0x explicit conversion operators. 4560 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4561 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4562 diag::warn_explicit_conversion_functions) 4563 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4564} 4565 4566/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4567/// the declaration of the given C++ conversion function. This routine 4568/// is responsible for recording the conversion function in the C++ 4569/// class, if possible. 4570Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4571 assert(Conversion && "Expected to receive a conversion function declaration"); 4572 4573 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4574 4575 // Make sure we aren't redeclaring the conversion function. 4576 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4577 4578 // C++ [class.conv.fct]p1: 4579 // [...] A conversion function is never used to convert a 4580 // (possibly cv-qualified) object to the (possibly cv-qualified) 4581 // same object type (or a reference to it), to a (possibly 4582 // cv-qualified) base class of that type (or a reference to it), 4583 // or to (possibly cv-qualified) void. 4584 // FIXME: Suppress this warning if the conversion function ends up being a 4585 // virtual function that overrides a virtual function in a base class. 4586 QualType ClassType 4587 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4588 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4589 ConvType = ConvTypeRef->getPointeeType(); 4590 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4591 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4592 /* Suppress diagnostics for instantiations. */; 4593 else if (ConvType->isRecordType()) { 4594 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4595 if (ConvType == ClassType) 4596 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4597 << ClassType; 4598 else if (IsDerivedFrom(ClassType, ConvType)) 4599 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4600 << ClassType << ConvType; 4601 } else if (ConvType->isVoidType()) { 4602 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4603 << ClassType << ConvType; 4604 } 4605 4606 if (FunctionTemplateDecl *ConversionTemplate 4607 = Conversion->getDescribedFunctionTemplate()) 4608 return ConversionTemplate; 4609 4610 return Conversion; 4611} 4612 4613//===----------------------------------------------------------------------===// 4614// Namespace Handling 4615//===----------------------------------------------------------------------===// 4616 4617 4618 4619/// ActOnStartNamespaceDef - This is called at the start of a namespace 4620/// definition. 4621Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4622 SourceLocation InlineLoc, 4623 SourceLocation NamespaceLoc, 4624 SourceLocation IdentLoc, 4625 IdentifierInfo *II, 4626 SourceLocation LBrace, 4627 AttributeList *AttrList) { 4628 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4629 // For anonymous namespace, take the location of the left brace. 4630 SourceLocation Loc = II ? IdentLoc : LBrace; 4631 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4632 StartLoc, Loc, II); 4633 Namespc->setInline(InlineLoc.isValid()); 4634 4635 Scope *DeclRegionScope = NamespcScope->getParent(); 4636 4637 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4638 4639 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4640 PushNamespaceVisibilityAttr(Attr); 4641 4642 if (II) { 4643 // C++ [namespace.def]p2: 4644 // The identifier in an original-namespace-definition shall not 4645 // have been previously defined in the declarative region in 4646 // which the original-namespace-definition appears. The 4647 // identifier in an original-namespace-definition is the name of 4648 // the namespace. Subsequently in that declarative region, it is 4649 // treated as an original-namespace-name. 4650 // 4651 // Since namespace names are unique in their scope, and we don't 4652 // look through using directives, just look for any ordinary names. 4653 4654 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4655 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4656 Decl::IDNS_Namespace; 4657 NamedDecl *PrevDecl = 0; 4658 for (DeclContext::lookup_result R 4659 = CurContext->getRedeclContext()->lookup(II); 4660 R.first != R.second; ++R.first) { 4661 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4662 PrevDecl = *R.first; 4663 break; 4664 } 4665 } 4666 4667 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4668 // This is an extended namespace definition. 4669 if (Namespc->isInline() != OrigNS->isInline()) { 4670 // inline-ness must match 4671 if (OrigNS->isInline()) { 4672 // The user probably just forgot the 'inline', so suggest that it 4673 // be added back. 4674 Diag(Namespc->getLocation(), 4675 diag::warn_inline_namespace_reopened_noninline) 4676 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4677 } else { 4678 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4679 << Namespc->isInline(); 4680 } 4681 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4682 4683 // Recover by ignoring the new namespace's inline status. 4684 Namespc->setInline(OrigNS->isInline()); 4685 } 4686 4687 // Attach this namespace decl to the chain of extended namespace 4688 // definitions. 4689 OrigNS->setNextNamespace(Namespc); 4690 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4691 4692 // Remove the previous declaration from the scope. 4693 if (DeclRegionScope->isDeclScope(OrigNS)) { 4694 IdResolver.RemoveDecl(OrigNS); 4695 DeclRegionScope->RemoveDecl(OrigNS); 4696 } 4697 } else if (PrevDecl) { 4698 // This is an invalid name redefinition. 4699 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4700 << Namespc->getDeclName(); 4701 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4702 Namespc->setInvalidDecl(); 4703 // Continue on to push Namespc as current DeclContext and return it. 4704 } else if (II->isStr("std") && 4705 CurContext->getRedeclContext()->isTranslationUnit()) { 4706 // This is the first "real" definition of the namespace "std", so update 4707 // our cache of the "std" namespace to point at this definition. 4708 if (NamespaceDecl *StdNS = getStdNamespace()) { 4709 // We had already defined a dummy namespace "std". Link this new 4710 // namespace definition to the dummy namespace "std". 4711 StdNS->setNextNamespace(Namespc); 4712 StdNS->setLocation(IdentLoc); 4713 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4714 } 4715 4716 // Make our StdNamespace cache point at the first real definition of the 4717 // "std" namespace. 4718 StdNamespace = Namespc; 4719 } 4720 4721 PushOnScopeChains(Namespc, DeclRegionScope); 4722 } else { 4723 // Anonymous namespaces. 4724 assert(Namespc->isAnonymousNamespace()); 4725 4726 // Link the anonymous namespace into its parent. 4727 NamespaceDecl *PrevDecl; 4728 DeclContext *Parent = CurContext->getRedeclContext(); 4729 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4730 PrevDecl = TU->getAnonymousNamespace(); 4731 TU->setAnonymousNamespace(Namespc); 4732 } else { 4733 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4734 PrevDecl = ND->getAnonymousNamespace(); 4735 ND->setAnonymousNamespace(Namespc); 4736 } 4737 4738 // Link the anonymous namespace with its previous declaration. 4739 if (PrevDecl) { 4740 assert(PrevDecl->isAnonymousNamespace()); 4741 assert(!PrevDecl->getNextNamespace()); 4742 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4743 PrevDecl->setNextNamespace(Namespc); 4744 4745 if (Namespc->isInline() != PrevDecl->isInline()) { 4746 // inline-ness must match 4747 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4748 << Namespc->isInline(); 4749 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4750 Namespc->setInvalidDecl(); 4751 // Recover by ignoring the new namespace's inline status. 4752 Namespc->setInline(PrevDecl->isInline()); 4753 } 4754 } 4755 4756 CurContext->addDecl(Namespc); 4757 4758 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4759 // behaves as if it were replaced by 4760 // namespace unique { /* empty body */ } 4761 // using namespace unique; 4762 // namespace unique { namespace-body } 4763 // where all occurrences of 'unique' in a translation unit are 4764 // replaced by the same identifier and this identifier differs 4765 // from all other identifiers in the entire program. 4766 4767 // We just create the namespace with an empty name and then add an 4768 // implicit using declaration, just like the standard suggests. 4769 // 4770 // CodeGen enforces the "universally unique" aspect by giving all 4771 // declarations semantically contained within an anonymous 4772 // namespace internal linkage. 4773 4774 if (!PrevDecl) { 4775 UsingDirectiveDecl* UD 4776 = UsingDirectiveDecl::Create(Context, CurContext, 4777 /* 'using' */ LBrace, 4778 /* 'namespace' */ SourceLocation(), 4779 /* qualifier */ NestedNameSpecifierLoc(), 4780 /* identifier */ SourceLocation(), 4781 Namespc, 4782 /* Ancestor */ CurContext); 4783 UD->setImplicit(); 4784 CurContext->addDecl(UD); 4785 } 4786 } 4787 4788 // Although we could have an invalid decl (i.e. the namespace name is a 4789 // redefinition), push it as current DeclContext and try to continue parsing. 4790 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4791 // for the namespace has the declarations that showed up in that particular 4792 // namespace definition. 4793 PushDeclContext(NamespcScope, Namespc); 4794 return Namespc; 4795} 4796 4797/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4798/// is a namespace alias, returns the namespace it points to. 4799static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4800 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4801 return AD->getNamespace(); 4802 return dyn_cast_or_null<NamespaceDecl>(D); 4803} 4804 4805/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4806/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4807void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4808 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4809 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4810 Namespc->setRBraceLoc(RBrace); 4811 PopDeclContext(); 4812 if (Namespc->hasAttr<VisibilityAttr>()) 4813 PopPragmaVisibility(); 4814} 4815 4816CXXRecordDecl *Sema::getStdBadAlloc() const { 4817 return cast_or_null<CXXRecordDecl>( 4818 StdBadAlloc.get(Context.getExternalSource())); 4819} 4820 4821NamespaceDecl *Sema::getStdNamespace() const { 4822 return cast_or_null<NamespaceDecl>( 4823 StdNamespace.get(Context.getExternalSource())); 4824} 4825 4826/// \brief Retrieve the special "std" namespace, which may require us to 4827/// implicitly define the namespace. 4828NamespaceDecl *Sema::getOrCreateStdNamespace() { 4829 if (!StdNamespace) { 4830 // The "std" namespace has not yet been defined, so build one implicitly. 4831 StdNamespace = NamespaceDecl::Create(Context, 4832 Context.getTranslationUnitDecl(), 4833 SourceLocation(), SourceLocation(), 4834 &PP.getIdentifierTable().get("std")); 4835 getStdNamespace()->setImplicit(true); 4836 } 4837 4838 return getStdNamespace(); 4839} 4840 4841/// \brief Determine whether a using statement is in a context where it will be 4842/// apply in all contexts. 4843static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4844 switch (CurContext->getDeclKind()) { 4845 case Decl::TranslationUnit: 4846 return true; 4847 case Decl::LinkageSpec: 4848 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4849 default: 4850 return false; 4851 } 4852} 4853 4854Decl *Sema::ActOnUsingDirective(Scope *S, 4855 SourceLocation UsingLoc, 4856 SourceLocation NamespcLoc, 4857 CXXScopeSpec &SS, 4858 SourceLocation IdentLoc, 4859 IdentifierInfo *NamespcName, 4860 AttributeList *AttrList) { 4861 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4862 assert(NamespcName && "Invalid NamespcName."); 4863 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4864 4865 // This can only happen along a recovery path. 4866 while (S->getFlags() & Scope::TemplateParamScope) 4867 S = S->getParent(); 4868 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4869 4870 UsingDirectiveDecl *UDir = 0; 4871 NestedNameSpecifier *Qualifier = 0; 4872 if (SS.isSet()) 4873 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4874 4875 // Lookup namespace name. 4876 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4877 LookupParsedName(R, S, &SS); 4878 if (R.isAmbiguous()) 4879 return 0; 4880 4881 if (R.empty()) { 4882 // Allow "using namespace std;" or "using namespace ::std;" even if 4883 // "std" hasn't been defined yet, for GCC compatibility. 4884 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4885 NamespcName->isStr("std")) { 4886 Diag(IdentLoc, diag::ext_using_undefined_std); 4887 R.addDecl(getOrCreateStdNamespace()); 4888 R.resolveKind(); 4889 } 4890 // Otherwise, attempt typo correction. 4891 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4892 CTC_NoKeywords, 0)) { 4893 if (R.getAsSingle<NamespaceDecl>() || 4894 R.getAsSingle<NamespaceAliasDecl>()) { 4895 if (DeclContext *DC = computeDeclContext(SS, false)) 4896 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4897 << NamespcName << DC << Corrected << SS.getRange() 4898 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4899 else 4900 Diag(IdentLoc, diag::err_using_directive_suggest) 4901 << NamespcName << Corrected 4902 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4903 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4904 << Corrected; 4905 4906 NamespcName = Corrected.getAsIdentifierInfo(); 4907 } else { 4908 R.clear(); 4909 R.setLookupName(NamespcName); 4910 } 4911 } 4912 } 4913 4914 if (!R.empty()) { 4915 NamedDecl *Named = R.getFoundDecl(); 4916 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4917 && "expected namespace decl"); 4918 // C++ [namespace.udir]p1: 4919 // A using-directive specifies that the names in the nominated 4920 // namespace can be used in the scope in which the 4921 // using-directive appears after the using-directive. During 4922 // unqualified name lookup (3.4.1), the names appear as if they 4923 // were declared in the nearest enclosing namespace which 4924 // contains both the using-directive and the nominated 4925 // namespace. [Note: in this context, "contains" means "contains 4926 // directly or indirectly". ] 4927 4928 // Find enclosing context containing both using-directive and 4929 // nominated namespace. 4930 NamespaceDecl *NS = getNamespaceDecl(Named); 4931 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4932 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4933 CommonAncestor = CommonAncestor->getParent(); 4934 4935 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4936 SS.getWithLocInContext(Context), 4937 IdentLoc, Named, CommonAncestor); 4938 4939 if (IsUsingDirectiveInToplevelContext(CurContext) && 4940 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4941 Diag(IdentLoc, diag::warn_using_directive_in_header); 4942 } 4943 4944 PushUsingDirective(S, UDir); 4945 } else { 4946 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4947 } 4948 4949 // FIXME: We ignore attributes for now. 4950 return UDir; 4951} 4952 4953void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4954 // If scope has associated entity, then using directive is at namespace 4955 // or translation unit scope. We add UsingDirectiveDecls, into 4956 // it's lookup structure. 4957 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4958 Ctx->addDecl(UDir); 4959 else 4960 // Otherwise it is block-sope. using-directives will affect lookup 4961 // only to the end of scope. 4962 S->PushUsingDirective(UDir); 4963} 4964 4965 4966Decl *Sema::ActOnUsingDeclaration(Scope *S, 4967 AccessSpecifier AS, 4968 bool HasUsingKeyword, 4969 SourceLocation UsingLoc, 4970 CXXScopeSpec &SS, 4971 UnqualifiedId &Name, 4972 AttributeList *AttrList, 4973 bool IsTypeName, 4974 SourceLocation TypenameLoc) { 4975 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4976 4977 switch (Name.getKind()) { 4978 case UnqualifiedId::IK_Identifier: 4979 case UnqualifiedId::IK_OperatorFunctionId: 4980 case UnqualifiedId::IK_LiteralOperatorId: 4981 case UnqualifiedId::IK_ConversionFunctionId: 4982 break; 4983 4984 case UnqualifiedId::IK_ConstructorName: 4985 case UnqualifiedId::IK_ConstructorTemplateId: 4986 // C++0x inherited constructors. 4987 if (getLangOptions().CPlusPlus0x) break; 4988 4989 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4990 << SS.getRange(); 4991 return 0; 4992 4993 case UnqualifiedId::IK_DestructorName: 4994 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4995 << SS.getRange(); 4996 return 0; 4997 4998 case UnqualifiedId::IK_TemplateId: 4999 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5000 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5001 return 0; 5002 } 5003 5004 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5005 DeclarationName TargetName = TargetNameInfo.getName(); 5006 if (!TargetName) 5007 return 0; 5008 5009 // Warn about using declarations. 5010 // TODO: store that the declaration was written without 'using' and 5011 // talk about access decls instead of using decls in the 5012 // diagnostics. 5013 if (!HasUsingKeyword) { 5014 UsingLoc = Name.getSourceRange().getBegin(); 5015 5016 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5017 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5018 } 5019 5020 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5021 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5022 return 0; 5023 5024 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5025 TargetNameInfo, AttrList, 5026 /* IsInstantiation */ false, 5027 IsTypeName, TypenameLoc); 5028 if (UD) 5029 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5030 5031 return UD; 5032} 5033 5034/// \brief Determine whether a using declaration considers the given 5035/// declarations as "equivalent", e.g., if they are redeclarations of 5036/// the same entity or are both typedefs of the same type. 5037static bool 5038IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5039 bool &SuppressRedeclaration) { 5040 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5041 SuppressRedeclaration = false; 5042 return true; 5043 } 5044 5045 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5046 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5047 SuppressRedeclaration = true; 5048 return Context.hasSameType(TD1->getUnderlyingType(), 5049 TD2->getUnderlyingType()); 5050 } 5051 5052 return false; 5053} 5054 5055 5056/// Determines whether to create a using shadow decl for a particular 5057/// decl, given the set of decls existing prior to this using lookup. 5058bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5059 const LookupResult &Previous) { 5060 // Diagnose finding a decl which is not from a base class of the 5061 // current class. We do this now because there are cases where this 5062 // function will silently decide not to build a shadow decl, which 5063 // will pre-empt further diagnostics. 5064 // 5065 // We don't need to do this in C++0x because we do the check once on 5066 // the qualifier. 5067 // 5068 // FIXME: diagnose the following if we care enough: 5069 // struct A { int foo; }; 5070 // struct B : A { using A::foo; }; 5071 // template <class T> struct C : A {}; 5072 // template <class T> struct D : C<T> { using B::foo; } // <--- 5073 // This is invalid (during instantiation) in C++03 because B::foo 5074 // resolves to the using decl in B, which is not a base class of D<T>. 5075 // We can't diagnose it immediately because C<T> is an unknown 5076 // specialization. The UsingShadowDecl in D<T> then points directly 5077 // to A::foo, which will look well-formed when we instantiate. 5078 // The right solution is to not collapse the shadow-decl chain. 5079 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5080 DeclContext *OrigDC = Orig->getDeclContext(); 5081 5082 // Handle enums and anonymous structs. 5083 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5084 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5085 while (OrigRec->isAnonymousStructOrUnion()) 5086 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5087 5088 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5089 if (OrigDC == CurContext) { 5090 Diag(Using->getLocation(), 5091 diag::err_using_decl_nested_name_specifier_is_current_class) 5092 << Using->getQualifierLoc().getSourceRange(); 5093 Diag(Orig->getLocation(), diag::note_using_decl_target); 5094 return true; 5095 } 5096 5097 Diag(Using->getQualifierLoc().getBeginLoc(), 5098 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5099 << Using->getQualifier() 5100 << cast<CXXRecordDecl>(CurContext) 5101 << Using->getQualifierLoc().getSourceRange(); 5102 Diag(Orig->getLocation(), diag::note_using_decl_target); 5103 return true; 5104 } 5105 } 5106 5107 if (Previous.empty()) return false; 5108 5109 NamedDecl *Target = Orig; 5110 if (isa<UsingShadowDecl>(Target)) 5111 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5112 5113 // If the target happens to be one of the previous declarations, we 5114 // don't have a conflict. 5115 // 5116 // FIXME: but we might be increasing its access, in which case we 5117 // should redeclare it. 5118 NamedDecl *NonTag = 0, *Tag = 0; 5119 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5120 I != E; ++I) { 5121 NamedDecl *D = (*I)->getUnderlyingDecl(); 5122 bool Result; 5123 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5124 return Result; 5125 5126 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5127 } 5128 5129 if (Target->isFunctionOrFunctionTemplate()) { 5130 FunctionDecl *FD; 5131 if (isa<FunctionTemplateDecl>(Target)) 5132 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5133 else 5134 FD = cast<FunctionDecl>(Target); 5135 5136 NamedDecl *OldDecl = 0; 5137 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5138 case Ovl_Overload: 5139 return false; 5140 5141 case Ovl_NonFunction: 5142 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5143 break; 5144 5145 // We found a decl with the exact signature. 5146 case Ovl_Match: 5147 // If we're in a record, we want to hide the target, so we 5148 // return true (without a diagnostic) to tell the caller not to 5149 // build a shadow decl. 5150 if (CurContext->isRecord()) 5151 return true; 5152 5153 // If we're not in a record, this is an error. 5154 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5155 break; 5156 } 5157 5158 Diag(Target->getLocation(), diag::note_using_decl_target); 5159 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5160 return true; 5161 } 5162 5163 // Target is not a function. 5164 5165 if (isa<TagDecl>(Target)) { 5166 // No conflict between a tag and a non-tag. 5167 if (!Tag) return false; 5168 5169 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5170 Diag(Target->getLocation(), diag::note_using_decl_target); 5171 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5172 return true; 5173 } 5174 5175 // No conflict between a tag and a non-tag. 5176 if (!NonTag) return false; 5177 5178 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5179 Diag(Target->getLocation(), diag::note_using_decl_target); 5180 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5181 return true; 5182} 5183 5184/// Builds a shadow declaration corresponding to a 'using' declaration. 5185UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5186 UsingDecl *UD, 5187 NamedDecl *Orig) { 5188 5189 // If we resolved to another shadow declaration, just coalesce them. 5190 NamedDecl *Target = Orig; 5191 if (isa<UsingShadowDecl>(Target)) { 5192 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5193 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5194 } 5195 5196 UsingShadowDecl *Shadow 5197 = UsingShadowDecl::Create(Context, CurContext, 5198 UD->getLocation(), UD, Target); 5199 UD->addShadowDecl(Shadow); 5200 5201 Shadow->setAccess(UD->getAccess()); 5202 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5203 Shadow->setInvalidDecl(); 5204 5205 if (S) 5206 PushOnScopeChains(Shadow, S); 5207 else 5208 CurContext->addDecl(Shadow); 5209 5210 5211 return Shadow; 5212} 5213 5214/// Hides a using shadow declaration. This is required by the current 5215/// using-decl implementation when a resolvable using declaration in a 5216/// class is followed by a declaration which would hide or override 5217/// one or more of the using decl's targets; for example: 5218/// 5219/// struct Base { void foo(int); }; 5220/// struct Derived : Base { 5221/// using Base::foo; 5222/// void foo(int); 5223/// }; 5224/// 5225/// The governing language is C++03 [namespace.udecl]p12: 5226/// 5227/// When a using-declaration brings names from a base class into a 5228/// derived class scope, member functions in the derived class 5229/// override and/or hide member functions with the same name and 5230/// parameter types in a base class (rather than conflicting). 5231/// 5232/// There are two ways to implement this: 5233/// (1) optimistically create shadow decls when they're not hidden 5234/// by existing declarations, or 5235/// (2) don't create any shadow decls (or at least don't make them 5236/// visible) until we've fully parsed/instantiated the class. 5237/// The problem with (1) is that we might have to retroactively remove 5238/// a shadow decl, which requires several O(n) operations because the 5239/// decl structures are (very reasonably) not designed for removal. 5240/// (2) avoids this but is very fiddly and phase-dependent. 5241void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5242 if (Shadow->getDeclName().getNameKind() == 5243 DeclarationName::CXXConversionFunctionName) 5244 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5245 5246 // Remove it from the DeclContext... 5247 Shadow->getDeclContext()->removeDecl(Shadow); 5248 5249 // ...and the scope, if applicable... 5250 if (S) { 5251 S->RemoveDecl(Shadow); 5252 IdResolver.RemoveDecl(Shadow); 5253 } 5254 5255 // ...and the using decl. 5256 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5257 5258 // TODO: complain somehow if Shadow was used. It shouldn't 5259 // be possible for this to happen, because...? 5260} 5261 5262/// Builds a using declaration. 5263/// 5264/// \param IsInstantiation - Whether this call arises from an 5265/// instantiation of an unresolved using declaration. We treat 5266/// the lookup differently for these declarations. 5267NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5268 SourceLocation UsingLoc, 5269 CXXScopeSpec &SS, 5270 const DeclarationNameInfo &NameInfo, 5271 AttributeList *AttrList, 5272 bool IsInstantiation, 5273 bool IsTypeName, 5274 SourceLocation TypenameLoc) { 5275 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5276 SourceLocation IdentLoc = NameInfo.getLoc(); 5277 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5278 5279 // FIXME: We ignore attributes for now. 5280 5281 if (SS.isEmpty()) { 5282 Diag(IdentLoc, diag::err_using_requires_qualname); 5283 return 0; 5284 } 5285 5286 // Do the redeclaration lookup in the current scope. 5287 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5288 ForRedeclaration); 5289 Previous.setHideTags(false); 5290 if (S) { 5291 LookupName(Previous, S); 5292 5293 // It is really dumb that we have to do this. 5294 LookupResult::Filter F = Previous.makeFilter(); 5295 while (F.hasNext()) { 5296 NamedDecl *D = F.next(); 5297 if (!isDeclInScope(D, CurContext, S)) 5298 F.erase(); 5299 } 5300 F.done(); 5301 } else { 5302 assert(IsInstantiation && "no scope in non-instantiation"); 5303 assert(CurContext->isRecord() && "scope not record in instantiation"); 5304 LookupQualifiedName(Previous, CurContext); 5305 } 5306 5307 // Check for invalid redeclarations. 5308 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5309 return 0; 5310 5311 // Check for bad qualifiers. 5312 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5313 return 0; 5314 5315 DeclContext *LookupContext = computeDeclContext(SS); 5316 NamedDecl *D; 5317 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5318 if (!LookupContext) { 5319 if (IsTypeName) { 5320 // FIXME: not all declaration name kinds are legal here 5321 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5322 UsingLoc, TypenameLoc, 5323 QualifierLoc, 5324 IdentLoc, NameInfo.getName()); 5325 } else { 5326 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5327 QualifierLoc, NameInfo); 5328 } 5329 } else { 5330 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5331 NameInfo, IsTypeName); 5332 } 5333 D->setAccess(AS); 5334 CurContext->addDecl(D); 5335 5336 if (!LookupContext) return D; 5337 UsingDecl *UD = cast<UsingDecl>(D); 5338 5339 if (RequireCompleteDeclContext(SS, LookupContext)) { 5340 UD->setInvalidDecl(); 5341 return UD; 5342 } 5343 5344 // Constructor inheriting using decls get special treatment. 5345 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5346 if (CheckInheritedConstructorUsingDecl(UD)) 5347 UD->setInvalidDecl(); 5348 return UD; 5349 } 5350 5351 // Otherwise, look up the target name. 5352 5353 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5354 R.setUsingDeclaration(true); 5355 5356 // Unlike most lookups, we don't always want to hide tag 5357 // declarations: tag names are visible through the using declaration 5358 // even if hidden by ordinary names, *except* in a dependent context 5359 // where it's important for the sanity of two-phase lookup. 5360 if (!IsInstantiation) 5361 R.setHideTags(false); 5362 5363 LookupQualifiedName(R, LookupContext); 5364 5365 if (R.empty()) { 5366 Diag(IdentLoc, diag::err_no_member) 5367 << NameInfo.getName() << LookupContext << SS.getRange(); 5368 UD->setInvalidDecl(); 5369 return UD; 5370 } 5371 5372 if (R.isAmbiguous()) { 5373 UD->setInvalidDecl(); 5374 return UD; 5375 } 5376 5377 if (IsTypeName) { 5378 // If we asked for a typename and got a non-type decl, error out. 5379 if (!R.getAsSingle<TypeDecl>()) { 5380 Diag(IdentLoc, diag::err_using_typename_non_type); 5381 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5382 Diag((*I)->getUnderlyingDecl()->getLocation(), 5383 diag::note_using_decl_target); 5384 UD->setInvalidDecl(); 5385 return UD; 5386 } 5387 } else { 5388 // If we asked for a non-typename and we got a type, error out, 5389 // but only if this is an instantiation of an unresolved using 5390 // decl. Otherwise just silently find the type name. 5391 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5392 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5393 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5394 UD->setInvalidDecl(); 5395 return UD; 5396 } 5397 } 5398 5399 // C++0x N2914 [namespace.udecl]p6: 5400 // A using-declaration shall not name a namespace. 5401 if (R.getAsSingle<NamespaceDecl>()) { 5402 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5403 << SS.getRange(); 5404 UD->setInvalidDecl(); 5405 return UD; 5406 } 5407 5408 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5409 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5410 BuildUsingShadowDecl(S, UD, *I); 5411 } 5412 5413 return UD; 5414} 5415 5416/// Additional checks for a using declaration referring to a constructor name. 5417bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5418 if (UD->isTypeName()) { 5419 // FIXME: Cannot specify typename when specifying constructor 5420 return true; 5421 } 5422 5423 const Type *SourceType = UD->getQualifier()->getAsType(); 5424 assert(SourceType && 5425 "Using decl naming constructor doesn't have type in scope spec."); 5426 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5427 5428 // Check whether the named type is a direct base class. 5429 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5430 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5431 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5432 BaseIt != BaseE; ++BaseIt) { 5433 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5434 if (CanonicalSourceType == BaseType) 5435 break; 5436 } 5437 5438 if (BaseIt == BaseE) { 5439 // Did not find SourceType in the bases. 5440 Diag(UD->getUsingLocation(), 5441 diag::err_using_decl_constructor_not_in_direct_base) 5442 << UD->getNameInfo().getSourceRange() 5443 << QualType(SourceType, 0) << TargetClass; 5444 return true; 5445 } 5446 5447 BaseIt->setInheritConstructors(); 5448 5449 return false; 5450} 5451 5452/// Checks that the given using declaration is not an invalid 5453/// redeclaration. Note that this is checking only for the using decl 5454/// itself, not for any ill-formedness among the UsingShadowDecls. 5455bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5456 bool isTypeName, 5457 const CXXScopeSpec &SS, 5458 SourceLocation NameLoc, 5459 const LookupResult &Prev) { 5460 // C++03 [namespace.udecl]p8: 5461 // C++0x [namespace.udecl]p10: 5462 // A using-declaration is a declaration and can therefore be used 5463 // repeatedly where (and only where) multiple declarations are 5464 // allowed. 5465 // 5466 // That's in non-member contexts. 5467 if (!CurContext->getRedeclContext()->isRecord()) 5468 return false; 5469 5470 NestedNameSpecifier *Qual 5471 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5472 5473 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5474 NamedDecl *D = *I; 5475 5476 bool DTypename; 5477 NestedNameSpecifier *DQual; 5478 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5479 DTypename = UD->isTypeName(); 5480 DQual = UD->getQualifier(); 5481 } else if (UnresolvedUsingValueDecl *UD 5482 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5483 DTypename = false; 5484 DQual = UD->getQualifier(); 5485 } else if (UnresolvedUsingTypenameDecl *UD 5486 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5487 DTypename = true; 5488 DQual = UD->getQualifier(); 5489 } else continue; 5490 5491 // using decls differ if one says 'typename' and the other doesn't. 5492 // FIXME: non-dependent using decls? 5493 if (isTypeName != DTypename) continue; 5494 5495 // using decls differ if they name different scopes (but note that 5496 // template instantiation can cause this check to trigger when it 5497 // didn't before instantiation). 5498 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5499 Context.getCanonicalNestedNameSpecifier(DQual)) 5500 continue; 5501 5502 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5503 Diag(D->getLocation(), diag::note_using_decl) << 1; 5504 return true; 5505 } 5506 5507 return false; 5508} 5509 5510 5511/// Checks that the given nested-name qualifier used in a using decl 5512/// in the current context is appropriately related to the current 5513/// scope. If an error is found, diagnoses it and returns true. 5514bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5515 const CXXScopeSpec &SS, 5516 SourceLocation NameLoc) { 5517 DeclContext *NamedContext = computeDeclContext(SS); 5518 5519 if (!CurContext->isRecord()) { 5520 // C++03 [namespace.udecl]p3: 5521 // C++0x [namespace.udecl]p8: 5522 // A using-declaration for a class member shall be a member-declaration. 5523 5524 // If we weren't able to compute a valid scope, it must be a 5525 // dependent class scope. 5526 if (!NamedContext || NamedContext->isRecord()) { 5527 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5528 << SS.getRange(); 5529 return true; 5530 } 5531 5532 // Otherwise, everything is known to be fine. 5533 return false; 5534 } 5535 5536 // The current scope is a record. 5537 5538 // If the named context is dependent, we can't decide much. 5539 if (!NamedContext) { 5540 // FIXME: in C++0x, we can diagnose if we can prove that the 5541 // nested-name-specifier does not refer to a base class, which is 5542 // still possible in some cases. 5543 5544 // Otherwise we have to conservatively report that things might be 5545 // okay. 5546 return false; 5547 } 5548 5549 if (!NamedContext->isRecord()) { 5550 // Ideally this would point at the last name in the specifier, 5551 // but we don't have that level of source info. 5552 Diag(SS.getRange().getBegin(), 5553 diag::err_using_decl_nested_name_specifier_is_not_class) 5554 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5555 return true; 5556 } 5557 5558 if (!NamedContext->isDependentContext() && 5559 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5560 return true; 5561 5562 if (getLangOptions().CPlusPlus0x) { 5563 // C++0x [namespace.udecl]p3: 5564 // In a using-declaration used as a member-declaration, the 5565 // nested-name-specifier shall name a base class of the class 5566 // being defined. 5567 5568 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5569 cast<CXXRecordDecl>(NamedContext))) { 5570 if (CurContext == NamedContext) { 5571 Diag(NameLoc, 5572 diag::err_using_decl_nested_name_specifier_is_current_class) 5573 << SS.getRange(); 5574 return true; 5575 } 5576 5577 Diag(SS.getRange().getBegin(), 5578 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5579 << (NestedNameSpecifier*) SS.getScopeRep() 5580 << cast<CXXRecordDecl>(CurContext) 5581 << SS.getRange(); 5582 return true; 5583 } 5584 5585 return false; 5586 } 5587 5588 // C++03 [namespace.udecl]p4: 5589 // A using-declaration used as a member-declaration shall refer 5590 // to a member of a base class of the class being defined [etc.]. 5591 5592 // Salient point: SS doesn't have to name a base class as long as 5593 // lookup only finds members from base classes. Therefore we can 5594 // diagnose here only if we can prove that that can't happen, 5595 // i.e. if the class hierarchies provably don't intersect. 5596 5597 // TODO: it would be nice if "definitely valid" results were cached 5598 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5599 // need to be repeated. 5600 5601 struct UserData { 5602 llvm::DenseSet<const CXXRecordDecl*> Bases; 5603 5604 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5605 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5606 Data->Bases.insert(Base); 5607 return true; 5608 } 5609 5610 bool hasDependentBases(const CXXRecordDecl *Class) { 5611 return !Class->forallBases(collect, this); 5612 } 5613 5614 /// Returns true if the base is dependent or is one of the 5615 /// accumulated base classes. 5616 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5617 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5618 return !Data->Bases.count(Base); 5619 } 5620 5621 bool mightShareBases(const CXXRecordDecl *Class) { 5622 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5623 } 5624 }; 5625 5626 UserData Data; 5627 5628 // Returns false if we find a dependent base. 5629 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5630 return false; 5631 5632 // Returns false if the class has a dependent base or if it or one 5633 // of its bases is present in the base set of the current context. 5634 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5635 return false; 5636 5637 Diag(SS.getRange().getBegin(), 5638 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5639 << (NestedNameSpecifier*) SS.getScopeRep() 5640 << cast<CXXRecordDecl>(CurContext) 5641 << SS.getRange(); 5642 5643 return true; 5644} 5645 5646Decl *Sema::ActOnAliasDeclaration(Scope *S, 5647 AccessSpecifier AS, 5648 MultiTemplateParamsArg TemplateParamLists, 5649 SourceLocation UsingLoc, 5650 UnqualifiedId &Name, 5651 TypeResult Type) { 5652 // Skip up to the relevant declaration scope. 5653 while (S->getFlags() & Scope::TemplateParamScope) 5654 S = S->getParent(); 5655 assert((S->getFlags() & Scope::DeclScope) && 5656 "got alias-declaration outside of declaration scope"); 5657 5658 if (Type.isInvalid()) 5659 return 0; 5660 5661 bool Invalid = false; 5662 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5663 TypeSourceInfo *TInfo = 0; 5664 GetTypeFromParser(Type.get(), &TInfo); 5665 5666 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5667 return 0; 5668 5669 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5670 UPPC_DeclarationType)) { 5671 Invalid = true; 5672 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5673 TInfo->getTypeLoc().getBeginLoc()); 5674 } 5675 5676 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5677 LookupName(Previous, S); 5678 5679 // Warn about shadowing the name of a template parameter. 5680 if (Previous.isSingleResult() && 5681 Previous.getFoundDecl()->isTemplateParameter()) { 5682 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5683 Previous.getFoundDecl())) 5684 Invalid = true; 5685 Previous.clear(); 5686 } 5687 5688 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5689 "name in alias declaration must be an identifier"); 5690 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5691 Name.StartLocation, 5692 Name.Identifier, TInfo); 5693 5694 NewTD->setAccess(AS); 5695 5696 if (Invalid) 5697 NewTD->setInvalidDecl(); 5698 5699 CheckTypedefForVariablyModifiedType(S, NewTD); 5700 Invalid |= NewTD->isInvalidDecl(); 5701 5702 bool Redeclaration = false; 5703 5704 NamedDecl *NewND; 5705 if (TemplateParamLists.size()) { 5706 TypeAliasTemplateDecl *OldDecl = 0; 5707 TemplateParameterList *OldTemplateParams = 0; 5708 5709 if (TemplateParamLists.size() != 1) { 5710 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5711 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5712 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5713 } 5714 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5715 5716 // Only consider previous declarations in the same scope. 5717 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5718 /*ExplicitInstantiationOrSpecialization*/false); 5719 if (!Previous.empty()) { 5720 Redeclaration = true; 5721 5722 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5723 if (!OldDecl && !Invalid) { 5724 Diag(UsingLoc, diag::err_redefinition_different_kind) 5725 << Name.Identifier; 5726 5727 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5728 if (OldD->getLocation().isValid()) 5729 Diag(OldD->getLocation(), diag::note_previous_definition); 5730 5731 Invalid = true; 5732 } 5733 5734 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5735 if (TemplateParameterListsAreEqual(TemplateParams, 5736 OldDecl->getTemplateParameters(), 5737 /*Complain=*/true, 5738 TPL_TemplateMatch)) 5739 OldTemplateParams = OldDecl->getTemplateParameters(); 5740 else 5741 Invalid = true; 5742 5743 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5744 if (!Invalid && 5745 !Context.hasSameType(OldTD->getUnderlyingType(), 5746 NewTD->getUnderlyingType())) { 5747 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5748 // but we can't reasonably accept it. 5749 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5750 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5751 if (OldTD->getLocation().isValid()) 5752 Diag(OldTD->getLocation(), diag::note_previous_definition); 5753 Invalid = true; 5754 } 5755 } 5756 } 5757 5758 // Merge any previous default template arguments into our parameters, 5759 // and check the parameter list. 5760 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5761 TPC_TypeAliasTemplate)) 5762 return 0; 5763 5764 TypeAliasTemplateDecl *NewDecl = 5765 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5766 Name.Identifier, TemplateParams, 5767 NewTD); 5768 5769 NewDecl->setAccess(AS); 5770 5771 if (Invalid) 5772 NewDecl->setInvalidDecl(); 5773 else if (OldDecl) 5774 NewDecl->setPreviousDeclaration(OldDecl); 5775 5776 NewND = NewDecl; 5777 } else { 5778 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5779 NewND = NewTD; 5780 } 5781 5782 if (!Redeclaration) 5783 PushOnScopeChains(NewND, S); 5784 5785 return NewND; 5786} 5787 5788Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5789 SourceLocation NamespaceLoc, 5790 SourceLocation AliasLoc, 5791 IdentifierInfo *Alias, 5792 CXXScopeSpec &SS, 5793 SourceLocation IdentLoc, 5794 IdentifierInfo *Ident) { 5795 5796 // Lookup the namespace name. 5797 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5798 LookupParsedName(R, S, &SS); 5799 5800 // Check if we have a previous declaration with the same name. 5801 NamedDecl *PrevDecl 5802 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5803 ForRedeclaration); 5804 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5805 PrevDecl = 0; 5806 5807 if (PrevDecl) { 5808 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5809 // We already have an alias with the same name that points to the same 5810 // namespace, so don't create a new one. 5811 // FIXME: At some point, we'll want to create the (redundant) 5812 // declaration to maintain better source information. 5813 if (!R.isAmbiguous() && !R.empty() && 5814 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5815 return 0; 5816 } 5817 5818 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5819 diag::err_redefinition_different_kind; 5820 Diag(AliasLoc, DiagID) << Alias; 5821 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5822 return 0; 5823 } 5824 5825 if (R.isAmbiguous()) 5826 return 0; 5827 5828 if (R.empty()) { 5829 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5830 CTC_NoKeywords, 0)) { 5831 if (R.getAsSingle<NamespaceDecl>() || 5832 R.getAsSingle<NamespaceAliasDecl>()) { 5833 if (DeclContext *DC = computeDeclContext(SS, false)) 5834 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5835 << Ident << DC << Corrected << SS.getRange() 5836 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5837 else 5838 Diag(IdentLoc, diag::err_using_directive_suggest) 5839 << Ident << Corrected 5840 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5841 5842 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5843 << Corrected; 5844 5845 Ident = Corrected.getAsIdentifierInfo(); 5846 } else { 5847 R.clear(); 5848 R.setLookupName(Ident); 5849 } 5850 } 5851 5852 if (R.empty()) { 5853 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5854 return 0; 5855 } 5856 } 5857 5858 NamespaceAliasDecl *AliasDecl = 5859 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5860 Alias, SS.getWithLocInContext(Context), 5861 IdentLoc, R.getFoundDecl()); 5862 5863 PushOnScopeChains(AliasDecl, S); 5864 return AliasDecl; 5865} 5866 5867namespace { 5868 /// \brief Scoped object used to handle the state changes required in Sema 5869 /// to implicitly define the body of a C++ member function; 5870 class ImplicitlyDefinedFunctionScope { 5871 Sema &S; 5872 Sema::ContextRAII SavedContext; 5873 5874 public: 5875 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5876 : S(S), SavedContext(S, Method) 5877 { 5878 S.PushFunctionScope(); 5879 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5880 } 5881 5882 ~ImplicitlyDefinedFunctionScope() { 5883 S.PopExpressionEvaluationContext(); 5884 S.PopFunctionOrBlockScope(); 5885 } 5886 }; 5887} 5888 5889static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5890 CXXRecordDecl *D) { 5891 ASTContext &Context = Self.Context; 5892 QualType ClassType = Context.getTypeDeclType(D); 5893 DeclarationName ConstructorName 5894 = Context.DeclarationNames.getCXXConstructorName( 5895 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5896 5897 DeclContext::lookup_const_iterator Con, ConEnd; 5898 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5899 Con != ConEnd; ++Con) { 5900 // FIXME: In C++0x, a constructor template can be a default constructor. 5901 if (isa<FunctionTemplateDecl>(*Con)) 5902 continue; 5903 5904 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5905 if (Constructor->isDefaultConstructor()) 5906 return Constructor; 5907 } 5908 return 0; 5909} 5910 5911Sema::ImplicitExceptionSpecification 5912Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5913 // C++ [except.spec]p14: 5914 // An implicitly declared special member function (Clause 12) shall have an 5915 // exception-specification. [...] 5916 ImplicitExceptionSpecification ExceptSpec(Context); 5917 5918 // Direct base-class constructors. 5919 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5920 BEnd = ClassDecl->bases_end(); 5921 B != BEnd; ++B) { 5922 if (B->isVirtual()) // Handled below. 5923 continue; 5924 5925 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5926 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5927 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5928 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5929 else if (CXXConstructorDecl *Constructor 5930 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5931 ExceptSpec.CalledDecl(Constructor); 5932 } 5933 } 5934 5935 // Virtual base-class constructors. 5936 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5937 BEnd = ClassDecl->vbases_end(); 5938 B != BEnd; ++B) { 5939 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5940 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5941 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5942 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5943 else if (CXXConstructorDecl *Constructor 5944 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5945 ExceptSpec.CalledDecl(Constructor); 5946 } 5947 } 5948 5949 // Field constructors. 5950 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5951 FEnd = ClassDecl->field_end(); 5952 F != FEnd; ++F) { 5953 if (const RecordType *RecordTy 5954 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5955 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5956 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5957 ExceptSpec.CalledDecl( 5958 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5959 else if (CXXConstructorDecl *Constructor 5960 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5961 ExceptSpec.CalledDecl(Constructor); 5962 } 5963 } 5964 5965 return ExceptSpec; 5966} 5967 5968CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5969 CXXRecordDecl *ClassDecl) { 5970 // C++ [class.ctor]p5: 5971 // A default constructor for a class X is a constructor of class X 5972 // that can be called without an argument. If there is no 5973 // user-declared constructor for class X, a default constructor is 5974 // implicitly declared. An implicitly-declared default constructor 5975 // is an inline public member of its class. 5976 assert(!ClassDecl->hasUserDeclaredConstructor() && 5977 "Should not build implicit default constructor!"); 5978 5979 ImplicitExceptionSpecification Spec = 5980 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5981 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5982 5983 // Create the actual constructor declaration. 5984 CanQualType ClassType 5985 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5986 SourceLocation ClassLoc = ClassDecl->getLocation(); 5987 DeclarationName Name 5988 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5989 DeclarationNameInfo NameInfo(Name, ClassLoc); 5990 CXXConstructorDecl *DefaultCon 5991 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5992 Context.getFunctionType(Context.VoidTy, 5993 0, 0, EPI), 5994 /*TInfo=*/0, 5995 /*isExplicit=*/false, 5996 /*isInline=*/true, 5997 /*isImplicitlyDeclared=*/true); 5998 DefaultCon->setAccess(AS_public); 5999 DefaultCon->setDefaulted(); 6000 DefaultCon->setImplicit(); 6001 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6002 6003 // Note that we have declared this constructor. 6004 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6005 6006 if (Scope *S = getScopeForContext(ClassDecl)) 6007 PushOnScopeChains(DefaultCon, S, false); 6008 ClassDecl->addDecl(DefaultCon); 6009 6010 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6011 DefaultCon->setDeletedAsWritten(); 6012 6013 return DefaultCon; 6014} 6015 6016void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6017 CXXConstructorDecl *Constructor) { 6018 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6019 !Constructor->doesThisDeclarationHaveABody() && 6020 !Constructor->isDeleted()) && 6021 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6022 6023 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6024 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6025 6026 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6027 DiagnosticErrorTrap Trap(Diags); 6028 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6029 Trap.hasErrorOccurred()) { 6030 Diag(CurrentLocation, diag::note_member_synthesized_at) 6031 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6032 Constructor->setInvalidDecl(); 6033 return; 6034 } 6035 6036 SourceLocation Loc = Constructor->getLocation(); 6037 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6038 6039 Constructor->setUsed(); 6040 MarkVTableUsed(CurrentLocation, ClassDecl); 6041 6042 if (ASTMutationListener *L = getASTMutationListener()) { 6043 L->CompletedImplicitDefinition(Constructor); 6044 } 6045} 6046 6047void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6048 // We start with an initial pass over the base classes to collect those that 6049 // inherit constructors from. If there are none, we can forgo all further 6050 // processing. 6051 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6052 BasesVector BasesToInheritFrom; 6053 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6054 BaseE = ClassDecl->bases_end(); 6055 BaseIt != BaseE; ++BaseIt) { 6056 if (BaseIt->getInheritConstructors()) { 6057 QualType Base = BaseIt->getType(); 6058 if (Base->isDependentType()) { 6059 // If we inherit constructors from anything that is dependent, just 6060 // abort processing altogether. We'll get another chance for the 6061 // instantiations. 6062 return; 6063 } 6064 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6065 } 6066 } 6067 if (BasesToInheritFrom.empty()) 6068 return; 6069 6070 // Now collect the constructors that we already have in the current class. 6071 // Those take precedence over inherited constructors. 6072 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6073 // unless there is a user-declared constructor with the same signature in 6074 // the class where the using-declaration appears. 6075 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6076 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6077 CtorE = ClassDecl->ctor_end(); 6078 CtorIt != CtorE; ++CtorIt) { 6079 ExistingConstructors.insert( 6080 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6081 } 6082 6083 Scope *S = getScopeForContext(ClassDecl); 6084 DeclarationName CreatedCtorName = 6085 Context.DeclarationNames.getCXXConstructorName( 6086 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6087 6088 // Now comes the true work. 6089 // First, we keep a map from constructor types to the base that introduced 6090 // them. Needed for finding conflicting constructors. We also keep the 6091 // actually inserted declarations in there, for pretty diagnostics. 6092 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6093 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6094 ConstructorToSourceMap InheritedConstructors; 6095 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6096 BaseE = BasesToInheritFrom.end(); 6097 BaseIt != BaseE; ++BaseIt) { 6098 const RecordType *Base = *BaseIt; 6099 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6100 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6101 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6102 CtorE = BaseDecl->ctor_end(); 6103 CtorIt != CtorE; ++CtorIt) { 6104 // Find the using declaration for inheriting this base's constructors. 6105 DeclarationName Name = 6106 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6107 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6108 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6109 SourceLocation UsingLoc = UD ? UD->getLocation() : 6110 ClassDecl->getLocation(); 6111 6112 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6113 // from the class X named in the using-declaration consists of actual 6114 // constructors and notional constructors that result from the 6115 // transformation of defaulted parameters as follows: 6116 // - all non-template default constructors of X, and 6117 // - for each non-template constructor of X that has at least one 6118 // parameter with a default argument, the set of constructors that 6119 // results from omitting any ellipsis parameter specification and 6120 // successively omitting parameters with a default argument from the 6121 // end of the parameter-type-list. 6122 CXXConstructorDecl *BaseCtor = *CtorIt; 6123 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6124 const FunctionProtoType *BaseCtorType = 6125 BaseCtor->getType()->getAs<FunctionProtoType>(); 6126 6127 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6128 maxParams = BaseCtor->getNumParams(); 6129 params <= maxParams; ++params) { 6130 // Skip default constructors. They're never inherited. 6131 if (params == 0) 6132 continue; 6133 // Skip copy and move constructors for the same reason. 6134 if (CanBeCopyOrMove && params == 1) 6135 continue; 6136 6137 // Build up a function type for this particular constructor. 6138 // FIXME: The working paper does not consider that the exception spec 6139 // for the inheriting constructor might be larger than that of the 6140 // source. This code doesn't yet, either. 6141 const Type *NewCtorType; 6142 if (params == maxParams) 6143 NewCtorType = BaseCtorType; 6144 else { 6145 llvm::SmallVector<QualType, 16> Args; 6146 for (unsigned i = 0; i < params; ++i) { 6147 Args.push_back(BaseCtorType->getArgType(i)); 6148 } 6149 FunctionProtoType::ExtProtoInfo ExtInfo = 6150 BaseCtorType->getExtProtoInfo(); 6151 ExtInfo.Variadic = false; 6152 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6153 Args.data(), params, ExtInfo) 6154 .getTypePtr(); 6155 } 6156 const Type *CanonicalNewCtorType = 6157 Context.getCanonicalType(NewCtorType); 6158 6159 // Now that we have the type, first check if the class already has a 6160 // constructor with this signature. 6161 if (ExistingConstructors.count(CanonicalNewCtorType)) 6162 continue; 6163 6164 // Then we check if we have already declared an inherited constructor 6165 // with this signature. 6166 std::pair<ConstructorToSourceMap::iterator, bool> result = 6167 InheritedConstructors.insert(std::make_pair( 6168 CanonicalNewCtorType, 6169 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6170 if (!result.second) { 6171 // Already in the map. If it came from a different class, that's an 6172 // error. Not if it's from the same. 6173 CanQualType PreviousBase = result.first->second.first; 6174 if (CanonicalBase != PreviousBase) { 6175 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6176 const CXXConstructorDecl *PrevBaseCtor = 6177 PrevCtor->getInheritedConstructor(); 6178 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6179 6180 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6181 Diag(BaseCtor->getLocation(), 6182 diag::note_using_decl_constructor_conflict_current_ctor); 6183 Diag(PrevBaseCtor->getLocation(), 6184 diag::note_using_decl_constructor_conflict_previous_ctor); 6185 Diag(PrevCtor->getLocation(), 6186 diag::note_using_decl_constructor_conflict_previous_using); 6187 } 6188 continue; 6189 } 6190 6191 // OK, we're there, now add the constructor. 6192 // C++0x [class.inhctor]p8: [...] that would be performed by a 6193 // user-writtern inline constructor [...] 6194 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6195 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6196 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6197 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6198 /*ImplicitlyDeclared=*/true); 6199 NewCtor->setAccess(BaseCtor->getAccess()); 6200 6201 // Build up the parameter decls and add them. 6202 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6203 for (unsigned i = 0; i < params; ++i) { 6204 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6205 UsingLoc, UsingLoc, 6206 /*IdentifierInfo=*/0, 6207 BaseCtorType->getArgType(i), 6208 /*TInfo=*/0, SC_None, 6209 SC_None, /*DefaultArg=*/0)); 6210 } 6211 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6212 NewCtor->setInheritedConstructor(BaseCtor); 6213 6214 PushOnScopeChains(NewCtor, S, false); 6215 ClassDecl->addDecl(NewCtor); 6216 result.first->second.second = NewCtor; 6217 } 6218 } 6219 } 6220} 6221 6222Sema::ImplicitExceptionSpecification 6223Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6224 // C++ [except.spec]p14: 6225 // An implicitly declared special member function (Clause 12) shall have 6226 // an exception-specification. 6227 ImplicitExceptionSpecification ExceptSpec(Context); 6228 6229 // Direct base-class destructors. 6230 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6231 BEnd = ClassDecl->bases_end(); 6232 B != BEnd; ++B) { 6233 if (B->isVirtual()) // Handled below. 6234 continue; 6235 6236 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6237 ExceptSpec.CalledDecl( 6238 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6239 } 6240 6241 // Virtual base-class destructors. 6242 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6243 BEnd = ClassDecl->vbases_end(); 6244 B != BEnd; ++B) { 6245 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6246 ExceptSpec.CalledDecl( 6247 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6248 } 6249 6250 // Field destructors. 6251 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6252 FEnd = ClassDecl->field_end(); 6253 F != FEnd; ++F) { 6254 if (const RecordType *RecordTy 6255 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6256 ExceptSpec.CalledDecl( 6257 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6258 } 6259 6260 return ExceptSpec; 6261} 6262 6263CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6264 // C++ [class.dtor]p2: 6265 // If a class has no user-declared destructor, a destructor is 6266 // declared implicitly. An implicitly-declared destructor is an 6267 // inline public member of its class. 6268 6269 ImplicitExceptionSpecification Spec = 6270 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6271 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6272 6273 // Create the actual destructor declaration. 6274 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6275 6276 CanQualType ClassType 6277 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6278 SourceLocation ClassLoc = ClassDecl->getLocation(); 6279 DeclarationName Name 6280 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6281 DeclarationNameInfo NameInfo(Name, ClassLoc); 6282 CXXDestructorDecl *Destructor 6283 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6284 /*isInline=*/true, 6285 /*isImplicitlyDeclared=*/true); 6286 Destructor->setAccess(AS_public); 6287 Destructor->setDefaulted(); 6288 Destructor->setImplicit(); 6289 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6290 6291 // Note that we have declared this destructor. 6292 ++ASTContext::NumImplicitDestructorsDeclared; 6293 6294 // Introduce this destructor into its scope. 6295 if (Scope *S = getScopeForContext(ClassDecl)) 6296 PushOnScopeChains(Destructor, S, false); 6297 ClassDecl->addDecl(Destructor); 6298 6299 // This could be uniqued if it ever proves significant. 6300 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6301 6302 if (ShouldDeleteDestructor(Destructor)) 6303 Destructor->setDeletedAsWritten(); 6304 6305 AddOverriddenMethods(ClassDecl, Destructor); 6306 6307 return Destructor; 6308} 6309 6310void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6311 CXXDestructorDecl *Destructor) { 6312 assert((Destructor->isDefaulted() && 6313 !Destructor->doesThisDeclarationHaveABody()) && 6314 "DefineImplicitDestructor - call it for implicit default dtor"); 6315 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6316 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6317 6318 if (Destructor->isInvalidDecl()) 6319 return; 6320 6321 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6322 6323 DiagnosticErrorTrap Trap(Diags); 6324 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6325 Destructor->getParent()); 6326 6327 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6328 Diag(CurrentLocation, diag::note_member_synthesized_at) 6329 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6330 6331 Destructor->setInvalidDecl(); 6332 return; 6333 } 6334 6335 SourceLocation Loc = Destructor->getLocation(); 6336 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6337 6338 Destructor->setUsed(); 6339 MarkVTableUsed(CurrentLocation, ClassDecl); 6340 6341 if (ASTMutationListener *L = getASTMutationListener()) { 6342 L->CompletedImplicitDefinition(Destructor); 6343 } 6344} 6345 6346void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6347 CXXDestructorDecl *destructor) { 6348 // C++11 [class.dtor]p3: 6349 // A declaration of a destructor that does not have an exception- 6350 // specification is implicitly considered to have the same exception- 6351 // specification as an implicit declaration. 6352 const FunctionProtoType *dtorType = destructor->getType()-> 6353 getAs<FunctionProtoType>(); 6354 if (dtorType->hasExceptionSpec()) 6355 return; 6356 6357 ImplicitExceptionSpecification exceptSpec = 6358 ComputeDefaultedDtorExceptionSpec(classDecl); 6359 6360 // Replace the destructor's type. 6361 FunctionProtoType::ExtProtoInfo epi; 6362 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6363 epi.NumExceptions = exceptSpec.size(); 6364 epi.Exceptions = exceptSpec.data(); 6365 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6366 6367 destructor->setType(ty); 6368 6369 // FIXME: If the destructor has a body that could throw, and the newly created 6370 // spec doesn't allow exceptions, we should emit a warning, because this 6371 // change in behavior can break conforming C++03 programs at runtime. 6372 // However, we don't have a body yet, so it needs to be done somewhere else. 6373} 6374 6375/// \brief Builds a statement that copies the given entity from \p From to 6376/// \c To. 6377/// 6378/// This routine is used to copy the members of a class with an 6379/// implicitly-declared copy assignment operator. When the entities being 6380/// copied are arrays, this routine builds for loops to copy them. 6381/// 6382/// \param S The Sema object used for type-checking. 6383/// 6384/// \param Loc The location where the implicit copy is being generated. 6385/// 6386/// \param T The type of the expressions being copied. Both expressions must 6387/// have this type. 6388/// 6389/// \param To The expression we are copying to. 6390/// 6391/// \param From The expression we are copying from. 6392/// 6393/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6394/// Otherwise, it's a non-static member subobject. 6395/// 6396/// \param Depth Internal parameter recording the depth of the recursion. 6397/// 6398/// \returns A statement or a loop that copies the expressions. 6399static StmtResult 6400BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6401 Expr *To, Expr *From, 6402 bool CopyingBaseSubobject, unsigned Depth = 0) { 6403 // C++0x [class.copy]p30: 6404 // Each subobject is assigned in the manner appropriate to its type: 6405 // 6406 // - if the subobject is of class type, the copy assignment operator 6407 // for the class is used (as if by explicit qualification; that is, 6408 // ignoring any possible virtual overriding functions in more derived 6409 // classes); 6410 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6411 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6412 6413 // Look for operator=. 6414 DeclarationName Name 6415 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6416 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6417 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6418 6419 // Filter out any result that isn't a copy-assignment operator. 6420 LookupResult::Filter F = OpLookup.makeFilter(); 6421 while (F.hasNext()) { 6422 NamedDecl *D = F.next(); 6423 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6424 if (Method->isCopyAssignmentOperator()) 6425 continue; 6426 6427 F.erase(); 6428 } 6429 F.done(); 6430 6431 // Suppress the protected check (C++ [class.protected]) for each of the 6432 // assignment operators we found. This strange dance is required when 6433 // we're assigning via a base classes's copy-assignment operator. To 6434 // ensure that we're getting the right base class subobject (without 6435 // ambiguities), we need to cast "this" to that subobject type; to 6436 // ensure that we don't go through the virtual call mechanism, we need 6437 // to qualify the operator= name with the base class (see below). However, 6438 // this means that if the base class has a protected copy assignment 6439 // operator, the protected member access check will fail. So, we 6440 // rewrite "protected" access to "public" access in this case, since we 6441 // know by construction that we're calling from a derived class. 6442 if (CopyingBaseSubobject) { 6443 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6444 L != LEnd; ++L) { 6445 if (L.getAccess() == AS_protected) 6446 L.setAccess(AS_public); 6447 } 6448 } 6449 6450 // Create the nested-name-specifier that will be used to qualify the 6451 // reference to operator=; this is required to suppress the virtual 6452 // call mechanism. 6453 CXXScopeSpec SS; 6454 SS.MakeTrivial(S.Context, 6455 NestedNameSpecifier::Create(S.Context, 0, false, 6456 T.getTypePtr()), 6457 Loc); 6458 6459 // Create the reference to operator=. 6460 ExprResult OpEqualRef 6461 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6462 /*FirstQualifierInScope=*/0, OpLookup, 6463 /*TemplateArgs=*/0, 6464 /*SuppressQualifierCheck=*/true); 6465 if (OpEqualRef.isInvalid()) 6466 return StmtError(); 6467 6468 // Build the call to the assignment operator. 6469 6470 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6471 OpEqualRef.takeAs<Expr>(), 6472 Loc, &From, 1, Loc); 6473 if (Call.isInvalid()) 6474 return StmtError(); 6475 6476 return S.Owned(Call.takeAs<Stmt>()); 6477 } 6478 6479 // - if the subobject is of scalar type, the built-in assignment 6480 // operator is used. 6481 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6482 if (!ArrayTy) { 6483 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6484 if (Assignment.isInvalid()) 6485 return StmtError(); 6486 6487 return S.Owned(Assignment.takeAs<Stmt>()); 6488 } 6489 6490 // - if the subobject is an array, each element is assigned, in the 6491 // manner appropriate to the element type; 6492 6493 // Construct a loop over the array bounds, e.g., 6494 // 6495 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6496 // 6497 // that will copy each of the array elements. 6498 QualType SizeType = S.Context.getSizeType(); 6499 6500 // Create the iteration variable. 6501 IdentifierInfo *IterationVarName = 0; 6502 { 6503 llvm::SmallString<8> Str; 6504 llvm::raw_svector_ostream OS(Str); 6505 OS << "__i" << Depth; 6506 IterationVarName = &S.Context.Idents.get(OS.str()); 6507 } 6508 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6509 IterationVarName, SizeType, 6510 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6511 SC_None, SC_None); 6512 6513 // Initialize the iteration variable to zero. 6514 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6515 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6516 6517 // Create a reference to the iteration variable; we'll use this several 6518 // times throughout. 6519 Expr *IterationVarRef 6520 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6521 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6522 6523 // Create the DeclStmt that holds the iteration variable. 6524 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6525 6526 // Create the comparison against the array bound. 6527 llvm::APInt Upper 6528 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6529 Expr *Comparison 6530 = new (S.Context) BinaryOperator(IterationVarRef, 6531 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6532 BO_NE, S.Context.BoolTy, 6533 VK_RValue, OK_Ordinary, Loc); 6534 6535 // Create the pre-increment of the iteration variable. 6536 Expr *Increment 6537 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6538 VK_LValue, OK_Ordinary, Loc); 6539 6540 // Subscript the "from" and "to" expressions with the iteration variable. 6541 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6542 IterationVarRef, Loc)); 6543 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6544 IterationVarRef, Loc)); 6545 6546 // Build the copy for an individual element of the array. 6547 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6548 To, From, CopyingBaseSubobject, 6549 Depth + 1); 6550 if (Copy.isInvalid()) 6551 return StmtError(); 6552 6553 // Construct the loop that copies all elements of this array. 6554 return S.ActOnForStmt(Loc, Loc, InitStmt, 6555 S.MakeFullExpr(Comparison), 6556 0, S.MakeFullExpr(Increment), 6557 Loc, Copy.take()); 6558} 6559 6560/// \brief Determine whether the given class has a copy assignment operator 6561/// that accepts a const-qualified argument. 6562static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6563 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6564 6565 if (!Class->hasDeclaredCopyAssignment()) 6566 S.DeclareImplicitCopyAssignment(Class); 6567 6568 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6569 DeclarationName OpName 6570 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6571 6572 DeclContext::lookup_const_iterator Op, OpEnd; 6573 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6574 // C++ [class.copy]p9: 6575 // A user-declared copy assignment operator is a non-static non-template 6576 // member function of class X with exactly one parameter of type X, X&, 6577 // const X&, volatile X& or const volatile X&. 6578 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6579 if (!Method) 6580 continue; 6581 6582 if (Method->isStatic()) 6583 continue; 6584 if (Method->getPrimaryTemplate()) 6585 continue; 6586 const FunctionProtoType *FnType = 6587 Method->getType()->getAs<FunctionProtoType>(); 6588 assert(FnType && "Overloaded operator has no prototype."); 6589 // Don't assert on this; an invalid decl might have been left in the AST. 6590 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6591 continue; 6592 bool AcceptsConst = true; 6593 QualType ArgType = FnType->getArgType(0); 6594 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6595 ArgType = Ref->getPointeeType(); 6596 // Is it a non-const lvalue reference? 6597 if (!ArgType.isConstQualified()) 6598 AcceptsConst = false; 6599 } 6600 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6601 continue; 6602 6603 // We have a single argument of type cv X or cv X&, i.e. we've found the 6604 // copy assignment operator. Return whether it accepts const arguments. 6605 return AcceptsConst; 6606 } 6607 assert(Class->isInvalidDecl() && 6608 "No copy assignment operator declared in valid code."); 6609 return false; 6610} 6611 6612std::pair<Sema::ImplicitExceptionSpecification, bool> 6613Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6614 CXXRecordDecl *ClassDecl) { 6615 // C++ [class.copy]p10: 6616 // If the class definition does not explicitly declare a copy 6617 // assignment operator, one is declared implicitly. 6618 // The implicitly-defined copy assignment operator for a class X 6619 // will have the form 6620 // 6621 // X& X::operator=(const X&) 6622 // 6623 // if 6624 bool HasConstCopyAssignment = true; 6625 6626 // -- each direct base class B of X has a copy assignment operator 6627 // whose parameter is of type const B&, const volatile B& or B, 6628 // and 6629 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6630 BaseEnd = ClassDecl->bases_end(); 6631 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6632 assert(!Base->getType()->isDependentType() && 6633 "Cannot generate implicit members for class with dependent bases."); 6634 const CXXRecordDecl *BaseClassDecl 6635 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6636 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6637 } 6638 6639 // -- for all the nonstatic data members of X that are of a class 6640 // type M (or array thereof), each such class type has a copy 6641 // assignment operator whose parameter is of type const M&, 6642 // const volatile M& or M. 6643 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6644 FieldEnd = ClassDecl->field_end(); 6645 HasConstCopyAssignment && Field != FieldEnd; 6646 ++Field) { 6647 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6648 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6649 const CXXRecordDecl *FieldClassDecl 6650 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6651 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6652 } 6653 } 6654 6655 // Otherwise, the implicitly declared copy assignment operator will 6656 // have the form 6657 // 6658 // X& X::operator=(X&) 6659 6660 // C++ [except.spec]p14: 6661 // An implicitly declared special member function (Clause 12) shall have an 6662 // exception-specification. [...] 6663 ImplicitExceptionSpecification ExceptSpec(Context); 6664 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6665 BaseEnd = ClassDecl->bases_end(); 6666 Base != BaseEnd; ++Base) { 6667 CXXRecordDecl *BaseClassDecl 6668 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6669 6670 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6671 DeclareImplicitCopyAssignment(BaseClassDecl); 6672 6673 if (CXXMethodDecl *CopyAssign 6674 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6675 ExceptSpec.CalledDecl(CopyAssign); 6676 } 6677 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6678 FieldEnd = ClassDecl->field_end(); 6679 Field != FieldEnd; 6680 ++Field) { 6681 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6682 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6683 CXXRecordDecl *FieldClassDecl 6684 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6685 6686 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6687 DeclareImplicitCopyAssignment(FieldClassDecl); 6688 6689 if (CXXMethodDecl *CopyAssign 6690 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6691 ExceptSpec.CalledDecl(CopyAssign); 6692 } 6693 } 6694 6695 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6696} 6697 6698CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6699 // Note: The following rules are largely analoguous to the copy 6700 // constructor rules. Note that virtual bases are not taken into account 6701 // for determining the argument type of the operator. Note also that 6702 // operators taking an object instead of a reference are allowed. 6703 6704 ImplicitExceptionSpecification Spec(Context); 6705 bool Const; 6706 llvm::tie(Spec, Const) = 6707 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6708 6709 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6710 QualType RetType = Context.getLValueReferenceType(ArgType); 6711 if (Const) 6712 ArgType = ArgType.withConst(); 6713 ArgType = Context.getLValueReferenceType(ArgType); 6714 6715 // An implicitly-declared copy assignment operator is an inline public 6716 // member of its class. 6717 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6718 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6719 SourceLocation ClassLoc = ClassDecl->getLocation(); 6720 DeclarationNameInfo NameInfo(Name, ClassLoc); 6721 CXXMethodDecl *CopyAssignment 6722 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6723 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6724 /*TInfo=*/0, /*isStatic=*/false, 6725 /*StorageClassAsWritten=*/SC_None, 6726 /*isInline=*/true, 6727 SourceLocation()); 6728 CopyAssignment->setAccess(AS_public); 6729 CopyAssignment->setDefaulted(); 6730 CopyAssignment->setImplicit(); 6731 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6732 6733 // Add the parameter to the operator. 6734 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6735 ClassLoc, ClassLoc, /*Id=*/0, 6736 ArgType, /*TInfo=*/0, 6737 SC_None, 6738 SC_None, 0); 6739 CopyAssignment->setParams(&FromParam, 1); 6740 6741 // Note that we have added this copy-assignment operator. 6742 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6743 6744 if (Scope *S = getScopeForContext(ClassDecl)) 6745 PushOnScopeChains(CopyAssignment, S, false); 6746 ClassDecl->addDecl(CopyAssignment); 6747 6748 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6749 CopyAssignment->setDeletedAsWritten(); 6750 6751 AddOverriddenMethods(ClassDecl, CopyAssignment); 6752 return CopyAssignment; 6753} 6754 6755void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6756 CXXMethodDecl *CopyAssignOperator) { 6757 assert((CopyAssignOperator->isDefaulted() && 6758 CopyAssignOperator->isOverloadedOperator() && 6759 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6760 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6761 "DefineImplicitCopyAssignment called for wrong function"); 6762 6763 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6764 6765 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6766 CopyAssignOperator->setInvalidDecl(); 6767 return; 6768 } 6769 6770 CopyAssignOperator->setUsed(); 6771 6772 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6773 DiagnosticErrorTrap Trap(Diags); 6774 6775 // C++0x [class.copy]p30: 6776 // The implicitly-defined or explicitly-defaulted copy assignment operator 6777 // for a non-union class X performs memberwise copy assignment of its 6778 // subobjects. The direct base classes of X are assigned first, in the 6779 // order of their declaration in the base-specifier-list, and then the 6780 // immediate non-static data members of X are assigned, in the order in 6781 // which they were declared in the class definition. 6782 6783 // The statements that form the synthesized function body. 6784 ASTOwningVector<Stmt*> Statements(*this); 6785 6786 // The parameter for the "other" object, which we are copying from. 6787 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6788 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6789 QualType OtherRefType = Other->getType(); 6790 if (const LValueReferenceType *OtherRef 6791 = OtherRefType->getAs<LValueReferenceType>()) { 6792 OtherRefType = OtherRef->getPointeeType(); 6793 OtherQuals = OtherRefType.getQualifiers(); 6794 } 6795 6796 // Our location for everything implicitly-generated. 6797 SourceLocation Loc = CopyAssignOperator->getLocation(); 6798 6799 // Construct a reference to the "other" object. We'll be using this 6800 // throughout the generated ASTs. 6801 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6802 assert(OtherRef && "Reference to parameter cannot fail!"); 6803 6804 // Construct the "this" pointer. We'll be using this throughout the generated 6805 // ASTs. 6806 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6807 assert(This && "Reference to this cannot fail!"); 6808 6809 // Assign base classes. 6810 bool Invalid = false; 6811 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6812 E = ClassDecl->bases_end(); Base != E; ++Base) { 6813 // Form the assignment: 6814 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6815 QualType BaseType = Base->getType().getUnqualifiedType(); 6816 if (!BaseType->isRecordType()) { 6817 Invalid = true; 6818 continue; 6819 } 6820 6821 CXXCastPath BasePath; 6822 BasePath.push_back(Base); 6823 6824 // Construct the "from" expression, which is an implicit cast to the 6825 // appropriately-qualified base type. 6826 Expr *From = OtherRef; 6827 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6828 CK_UncheckedDerivedToBase, 6829 VK_LValue, &BasePath).take(); 6830 6831 // Dereference "this". 6832 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6833 6834 // Implicitly cast "this" to the appropriately-qualified base type. 6835 To = ImpCastExprToType(To.take(), 6836 Context.getCVRQualifiedType(BaseType, 6837 CopyAssignOperator->getTypeQualifiers()), 6838 CK_UncheckedDerivedToBase, 6839 VK_LValue, &BasePath); 6840 6841 // Build the copy. 6842 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6843 To.get(), From, 6844 /*CopyingBaseSubobject=*/true); 6845 if (Copy.isInvalid()) { 6846 Diag(CurrentLocation, diag::note_member_synthesized_at) 6847 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6848 CopyAssignOperator->setInvalidDecl(); 6849 return; 6850 } 6851 6852 // Success! Record the copy. 6853 Statements.push_back(Copy.takeAs<Expr>()); 6854 } 6855 6856 // \brief Reference to the __builtin_memcpy function. 6857 Expr *BuiltinMemCpyRef = 0; 6858 // \brief Reference to the __builtin_objc_memmove_collectable function. 6859 Expr *CollectableMemCpyRef = 0; 6860 6861 // Assign non-static members. 6862 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6863 FieldEnd = ClassDecl->field_end(); 6864 Field != FieldEnd; ++Field) { 6865 // Check for members of reference type; we can't copy those. 6866 if (Field->getType()->isReferenceType()) { 6867 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6868 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6869 Diag(Field->getLocation(), diag::note_declared_at); 6870 Diag(CurrentLocation, diag::note_member_synthesized_at) 6871 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6872 Invalid = true; 6873 continue; 6874 } 6875 6876 // Check for members of const-qualified, non-class type. 6877 QualType BaseType = Context.getBaseElementType(Field->getType()); 6878 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6879 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6880 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6881 Diag(Field->getLocation(), diag::note_declared_at); 6882 Diag(CurrentLocation, diag::note_member_synthesized_at) 6883 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6884 Invalid = true; 6885 continue; 6886 } 6887 6888 QualType FieldType = Field->getType().getNonReferenceType(); 6889 if (FieldType->isIncompleteArrayType()) { 6890 assert(ClassDecl->hasFlexibleArrayMember() && 6891 "Incomplete array type is not valid"); 6892 continue; 6893 } 6894 6895 // Build references to the field in the object we're copying from and to. 6896 CXXScopeSpec SS; // Intentionally empty 6897 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6898 LookupMemberName); 6899 MemberLookup.addDecl(*Field); 6900 MemberLookup.resolveKind(); 6901 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6902 Loc, /*IsArrow=*/false, 6903 SS, 0, MemberLookup, 0); 6904 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6905 Loc, /*IsArrow=*/true, 6906 SS, 0, MemberLookup, 0); 6907 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6908 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6909 6910 // If the field should be copied with __builtin_memcpy rather than via 6911 // explicit assignments, do so. This optimization only applies for arrays 6912 // of scalars and arrays of class type with trivial copy-assignment 6913 // operators. 6914 if (FieldType->isArrayType() && 6915 (!BaseType->isRecordType() || 6916 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6917 ->hasTrivialCopyAssignment())) { 6918 // Compute the size of the memory buffer to be copied. 6919 QualType SizeType = Context.getSizeType(); 6920 llvm::APInt Size(Context.getTypeSize(SizeType), 6921 Context.getTypeSizeInChars(BaseType).getQuantity()); 6922 for (const ConstantArrayType *Array 6923 = Context.getAsConstantArrayType(FieldType); 6924 Array; 6925 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6926 llvm::APInt ArraySize 6927 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6928 Size *= ArraySize; 6929 } 6930 6931 // Take the address of the field references for "from" and "to". 6932 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6933 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6934 6935 bool NeedsCollectableMemCpy = 6936 (BaseType->isRecordType() && 6937 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6938 6939 if (NeedsCollectableMemCpy) { 6940 if (!CollectableMemCpyRef) { 6941 // Create a reference to the __builtin_objc_memmove_collectable function. 6942 LookupResult R(*this, 6943 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6944 Loc, LookupOrdinaryName); 6945 LookupName(R, TUScope, true); 6946 6947 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6948 if (!CollectableMemCpy) { 6949 // Something went horribly wrong earlier, and we will have 6950 // complained about it. 6951 Invalid = true; 6952 continue; 6953 } 6954 6955 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6956 CollectableMemCpy->getType(), 6957 VK_LValue, Loc, 0).take(); 6958 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6959 } 6960 } 6961 // Create a reference to the __builtin_memcpy builtin function. 6962 else if (!BuiltinMemCpyRef) { 6963 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6964 LookupOrdinaryName); 6965 LookupName(R, TUScope, true); 6966 6967 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6968 if (!BuiltinMemCpy) { 6969 // Something went horribly wrong earlier, and we will have complained 6970 // about it. 6971 Invalid = true; 6972 continue; 6973 } 6974 6975 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6976 BuiltinMemCpy->getType(), 6977 VK_LValue, Loc, 0).take(); 6978 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6979 } 6980 6981 ASTOwningVector<Expr*> CallArgs(*this); 6982 CallArgs.push_back(To.takeAs<Expr>()); 6983 CallArgs.push_back(From.takeAs<Expr>()); 6984 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6985 ExprResult Call = ExprError(); 6986 if (NeedsCollectableMemCpy) 6987 Call = ActOnCallExpr(/*Scope=*/0, 6988 CollectableMemCpyRef, 6989 Loc, move_arg(CallArgs), 6990 Loc); 6991 else 6992 Call = ActOnCallExpr(/*Scope=*/0, 6993 BuiltinMemCpyRef, 6994 Loc, move_arg(CallArgs), 6995 Loc); 6996 6997 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6998 Statements.push_back(Call.takeAs<Expr>()); 6999 continue; 7000 } 7001 7002 // Build the copy of this field. 7003 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7004 To.get(), From.get(), 7005 /*CopyingBaseSubobject=*/false); 7006 if (Copy.isInvalid()) { 7007 Diag(CurrentLocation, diag::note_member_synthesized_at) 7008 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7009 CopyAssignOperator->setInvalidDecl(); 7010 return; 7011 } 7012 7013 // Success! Record the copy. 7014 Statements.push_back(Copy.takeAs<Stmt>()); 7015 } 7016 7017 if (!Invalid) { 7018 // Add a "return *this;" 7019 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7020 7021 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7022 if (Return.isInvalid()) 7023 Invalid = true; 7024 else { 7025 Statements.push_back(Return.takeAs<Stmt>()); 7026 7027 if (Trap.hasErrorOccurred()) { 7028 Diag(CurrentLocation, diag::note_member_synthesized_at) 7029 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7030 Invalid = true; 7031 } 7032 } 7033 } 7034 7035 if (Invalid) { 7036 CopyAssignOperator->setInvalidDecl(); 7037 return; 7038 } 7039 7040 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7041 /*isStmtExpr=*/false); 7042 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7043 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7044 7045 if (ASTMutationListener *L = getASTMutationListener()) { 7046 L->CompletedImplicitDefinition(CopyAssignOperator); 7047 } 7048} 7049 7050std::pair<Sema::ImplicitExceptionSpecification, bool> 7051Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7052 // C++ [class.copy]p5: 7053 // The implicitly-declared copy constructor for a class X will 7054 // have the form 7055 // 7056 // X::X(const X&) 7057 // 7058 // if 7059 bool HasConstCopyConstructor = true; 7060 7061 // -- each direct or virtual base class B of X has a copy 7062 // constructor whose first parameter is of type const B& or 7063 // const volatile B&, and 7064 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7065 BaseEnd = ClassDecl->bases_end(); 7066 HasConstCopyConstructor && Base != BaseEnd; 7067 ++Base) { 7068 // Virtual bases are handled below. 7069 if (Base->isVirtual()) 7070 continue; 7071 7072 CXXRecordDecl *BaseClassDecl 7073 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7074 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7075 DeclareImplicitCopyConstructor(BaseClassDecl); 7076 7077 HasConstCopyConstructor = BaseClassDecl->hasConstCopyConstructor(); 7078 } 7079 7080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7081 BaseEnd = ClassDecl->vbases_end(); 7082 HasConstCopyConstructor && Base != BaseEnd; 7083 ++Base) { 7084 CXXRecordDecl *BaseClassDecl 7085 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7086 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7087 DeclareImplicitCopyConstructor(BaseClassDecl); 7088 7089 HasConstCopyConstructor= BaseClassDecl->hasConstCopyConstructor(); 7090 } 7091 7092 // -- for all the nonstatic data members of X that are of a 7093 // class type M (or array thereof), each such class type 7094 // has a copy constructor whose first parameter is of type 7095 // const M& or const volatile M&. 7096 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7097 FieldEnd = ClassDecl->field_end(); 7098 HasConstCopyConstructor && Field != FieldEnd; 7099 ++Field) { 7100 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7101 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7102 CXXRecordDecl *FieldClassDecl 7103 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7104 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7105 DeclareImplicitCopyConstructor(FieldClassDecl); 7106 7107 HasConstCopyConstructor = FieldClassDecl->hasConstCopyConstructor(); 7108 } 7109 } 7110 // Otherwise, the implicitly declared copy constructor will have 7111 // the form 7112 // 7113 // X::X(X&) 7114 7115 // C++ [except.spec]p14: 7116 // An implicitly declared special member function (Clause 12) shall have an 7117 // exception-specification. [...] 7118 ImplicitExceptionSpecification ExceptSpec(Context); 7119 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7120 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7121 BaseEnd = ClassDecl->bases_end(); 7122 Base != BaseEnd; 7123 ++Base) { 7124 // Virtual bases are handled below. 7125 if (Base->isVirtual()) 7126 continue; 7127 7128 CXXRecordDecl *BaseClassDecl 7129 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7130 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7131 DeclareImplicitCopyConstructor(BaseClassDecl); 7132 7133 if (CXXConstructorDecl *CopyConstructor 7134 = BaseClassDecl->getCopyConstructor(Quals)) 7135 ExceptSpec.CalledDecl(CopyConstructor); 7136 } 7137 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7138 BaseEnd = ClassDecl->vbases_end(); 7139 Base != BaseEnd; 7140 ++Base) { 7141 CXXRecordDecl *BaseClassDecl 7142 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7143 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7144 DeclareImplicitCopyConstructor(BaseClassDecl); 7145 7146 if (CXXConstructorDecl *CopyConstructor 7147 = BaseClassDecl->getCopyConstructor(Quals)) 7148 ExceptSpec.CalledDecl(CopyConstructor); 7149 } 7150 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7151 FieldEnd = ClassDecl->field_end(); 7152 Field != FieldEnd; 7153 ++Field) { 7154 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7155 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7156 CXXRecordDecl *FieldClassDecl 7157 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7158 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7159 DeclareImplicitCopyConstructor(FieldClassDecl); 7160 7161 if (CXXConstructorDecl *CopyConstructor 7162 = FieldClassDecl->getCopyConstructor(Quals)) 7163 ExceptSpec.CalledDecl(CopyConstructor); 7164 } 7165 } 7166 7167 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7168} 7169 7170CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7171 CXXRecordDecl *ClassDecl) { 7172 // C++ [class.copy]p4: 7173 // If the class definition does not explicitly declare a copy 7174 // constructor, one is declared implicitly. 7175 7176 ImplicitExceptionSpecification Spec(Context); 7177 bool Const; 7178 llvm::tie(Spec, Const) = 7179 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7180 7181 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7182 QualType ArgType = ClassType; 7183 if (Const) 7184 ArgType = ArgType.withConst(); 7185 ArgType = Context.getLValueReferenceType(ArgType); 7186 7187 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7188 7189 DeclarationName Name 7190 = Context.DeclarationNames.getCXXConstructorName( 7191 Context.getCanonicalType(ClassType)); 7192 SourceLocation ClassLoc = ClassDecl->getLocation(); 7193 DeclarationNameInfo NameInfo(Name, ClassLoc); 7194 7195 // An implicitly-declared copy constructor is an inline public 7196 // member of its class. 7197 CXXConstructorDecl *CopyConstructor 7198 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7199 Context.getFunctionType(Context.VoidTy, 7200 &ArgType, 1, EPI), 7201 /*TInfo=*/0, 7202 /*isExplicit=*/false, 7203 /*isInline=*/true, 7204 /*isImplicitlyDeclared=*/true); 7205 CopyConstructor->setAccess(AS_public); 7206 CopyConstructor->setDefaulted(); 7207 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7208 7209 // Note that we have declared this constructor. 7210 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7211 7212 // Add the parameter to the constructor. 7213 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7214 ClassLoc, ClassLoc, 7215 /*IdentifierInfo=*/0, 7216 ArgType, /*TInfo=*/0, 7217 SC_None, 7218 SC_None, 0); 7219 CopyConstructor->setParams(&FromParam, 1); 7220 7221 if (Scope *S = getScopeForContext(ClassDecl)) 7222 PushOnScopeChains(CopyConstructor, S, false); 7223 ClassDecl->addDecl(CopyConstructor); 7224 7225 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7226 CopyConstructor->setDeletedAsWritten(); 7227 7228 return CopyConstructor; 7229} 7230 7231void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7232 CXXConstructorDecl *CopyConstructor) { 7233 assert((CopyConstructor->isDefaulted() && 7234 CopyConstructor->isCopyConstructor() && 7235 !CopyConstructor->doesThisDeclarationHaveABody()) && 7236 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7237 7238 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7239 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7240 7241 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7242 DiagnosticErrorTrap Trap(Diags); 7243 7244 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7245 Trap.hasErrorOccurred()) { 7246 Diag(CurrentLocation, diag::note_member_synthesized_at) 7247 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7248 CopyConstructor->setInvalidDecl(); 7249 } else { 7250 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7251 CopyConstructor->getLocation(), 7252 MultiStmtArg(*this, 0, 0), 7253 /*isStmtExpr=*/false) 7254 .takeAs<Stmt>()); 7255 } 7256 7257 CopyConstructor->setUsed(); 7258 7259 if (ASTMutationListener *L = getASTMutationListener()) { 7260 L->CompletedImplicitDefinition(CopyConstructor); 7261 } 7262} 7263 7264ExprResult 7265Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7266 CXXConstructorDecl *Constructor, 7267 MultiExprArg ExprArgs, 7268 bool RequiresZeroInit, 7269 unsigned ConstructKind, 7270 SourceRange ParenRange) { 7271 bool Elidable = false; 7272 7273 // C++0x [class.copy]p34: 7274 // When certain criteria are met, an implementation is allowed to 7275 // omit the copy/move construction of a class object, even if the 7276 // copy/move constructor and/or destructor for the object have 7277 // side effects. [...] 7278 // - when a temporary class object that has not been bound to a 7279 // reference (12.2) would be copied/moved to a class object 7280 // with the same cv-unqualified type, the copy/move operation 7281 // can be omitted by constructing the temporary object 7282 // directly into the target of the omitted copy/move 7283 if (ConstructKind == CXXConstructExpr::CK_Complete && 7284 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7285 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7286 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7287 } 7288 7289 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7290 Elidable, move(ExprArgs), RequiresZeroInit, 7291 ConstructKind, ParenRange); 7292} 7293 7294/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7295/// including handling of its default argument expressions. 7296ExprResult 7297Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7298 CXXConstructorDecl *Constructor, bool Elidable, 7299 MultiExprArg ExprArgs, 7300 bool RequiresZeroInit, 7301 unsigned ConstructKind, 7302 SourceRange ParenRange) { 7303 unsigned NumExprs = ExprArgs.size(); 7304 Expr **Exprs = (Expr **)ExprArgs.release(); 7305 7306 for (specific_attr_iterator<NonNullAttr> 7307 i = Constructor->specific_attr_begin<NonNullAttr>(), 7308 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7309 const NonNullAttr *NonNull = *i; 7310 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7311 } 7312 7313 MarkDeclarationReferenced(ConstructLoc, Constructor); 7314 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7315 Constructor, Elidable, Exprs, NumExprs, 7316 RequiresZeroInit, 7317 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7318 ParenRange)); 7319} 7320 7321bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7322 CXXConstructorDecl *Constructor, 7323 MultiExprArg Exprs) { 7324 // FIXME: Provide the correct paren SourceRange when available. 7325 ExprResult TempResult = 7326 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7327 move(Exprs), false, CXXConstructExpr::CK_Complete, 7328 SourceRange()); 7329 if (TempResult.isInvalid()) 7330 return true; 7331 7332 Expr *Temp = TempResult.takeAs<Expr>(); 7333 CheckImplicitConversions(Temp, VD->getLocation()); 7334 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7335 Temp = MaybeCreateExprWithCleanups(Temp); 7336 VD->setInit(Temp); 7337 7338 return false; 7339} 7340 7341void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7342 if (VD->isInvalidDecl()) return; 7343 7344 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7345 if (ClassDecl->isInvalidDecl()) return; 7346 if (ClassDecl->hasTrivialDestructor()) return; 7347 if (ClassDecl->isDependentContext()) return; 7348 7349 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7350 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7351 CheckDestructorAccess(VD->getLocation(), Destructor, 7352 PDiag(diag::err_access_dtor_var) 7353 << VD->getDeclName() 7354 << VD->getType()); 7355 7356 if (!VD->hasGlobalStorage()) return; 7357 7358 // Emit warning for non-trivial dtor in global scope (a real global, 7359 // class-static, function-static). 7360 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7361 7362 // TODO: this should be re-enabled for static locals by !CXAAtExit 7363 if (!VD->isStaticLocal()) 7364 Diag(VD->getLocation(), diag::warn_global_destructor); 7365} 7366 7367/// AddCXXDirectInitializerToDecl - This action is called immediately after 7368/// ActOnDeclarator, when a C++ direct initializer is present. 7369/// e.g: "int x(1);" 7370void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7371 SourceLocation LParenLoc, 7372 MultiExprArg Exprs, 7373 SourceLocation RParenLoc, 7374 bool TypeMayContainAuto) { 7375 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7376 7377 // If there is no declaration, there was an error parsing it. Just ignore 7378 // the initializer. 7379 if (RealDecl == 0) 7380 return; 7381 7382 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7383 if (!VDecl) { 7384 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7385 RealDecl->setInvalidDecl(); 7386 return; 7387 } 7388 7389 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7390 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7391 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7392 if (Exprs.size() > 1) { 7393 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7394 diag::err_auto_var_init_multiple_expressions) 7395 << VDecl->getDeclName() << VDecl->getType() 7396 << VDecl->getSourceRange(); 7397 RealDecl->setInvalidDecl(); 7398 return; 7399 } 7400 7401 Expr *Init = Exprs.get()[0]; 7402 TypeSourceInfo *DeducedType = 0; 7403 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7404 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7405 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7406 << Init->getSourceRange(); 7407 if (!DeducedType) { 7408 RealDecl->setInvalidDecl(); 7409 return; 7410 } 7411 VDecl->setTypeSourceInfo(DeducedType); 7412 VDecl->setType(DeducedType->getType()); 7413 7414 // If this is a redeclaration, check that the type we just deduced matches 7415 // the previously declared type. 7416 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7417 MergeVarDeclTypes(VDecl, Old); 7418 } 7419 7420 // We will represent direct-initialization similarly to copy-initialization: 7421 // int x(1); -as-> int x = 1; 7422 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7423 // 7424 // Clients that want to distinguish between the two forms, can check for 7425 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7426 // A major benefit is that clients that don't particularly care about which 7427 // exactly form was it (like the CodeGen) can handle both cases without 7428 // special case code. 7429 7430 // C++ 8.5p11: 7431 // The form of initialization (using parentheses or '=') is generally 7432 // insignificant, but does matter when the entity being initialized has a 7433 // class type. 7434 7435 if (!VDecl->getType()->isDependentType() && 7436 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7437 diag::err_typecheck_decl_incomplete_type)) { 7438 VDecl->setInvalidDecl(); 7439 return; 7440 } 7441 7442 // The variable can not have an abstract class type. 7443 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7444 diag::err_abstract_type_in_decl, 7445 AbstractVariableType)) 7446 VDecl->setInvalidDecl(); 7447 7448 const VarDecl *Def; 7449 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7450 Diag(VDecl->getLocation(), diag::err_redefinition) 7451 << VDecl->getDeclName(); 7452 Diag(Def->getLocation(), diag::note_previous_definition); 7453 VDecl->setInvalidDecl(); 7454 return; 7455 } 7456 7457 // C++ [class.static.data]p4 7458 // If a static data member is of const integral or const 7459 // enumeration type, its declaration in the class definition can 7460 // specify a constant-initializer which shall be an integral 7461 // constant expression (5.19). In that case, the member can appear 7462 // in integral constant expressions. The member shall still be 7463 // defined in a namespace scope if it is used in the program and the 7464 // namespace scope definition shall not contain an initializer. 7465 // 7466 // We already performed a redefinition check above, but for static 7467 // data members we also need to check whether there was an in-class 7468 // declaration with an initializer. 7469 const VarDecl* PrevInit = 0; 7470 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7471 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7472 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7473 return; 7474 } 7475 7476 bool IsDependent = false; 7477 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7478 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7479 VDecl->setInvalidDecl(); 7480 return; 7481 } 7482 7483 if (Exprs.get()[I]->isTypeDependent()) 7484 IsDependent = true; 7485 } 7486 7487 // If either the declaration has a dependent type or if any of the 7488 // expressions is type-dependent, we represent the initialization 7489 // via a ParenListExpr for later use during template instantiation. 7490 if (VDecl->getType()->isDependentType() || IsDependent) { 7491 // Let clients know that initialization was done with a direct initializer. 7492 VDecl->setCXXDirectInitializer(true); 7493 7494 // Store the initialization expressions as a ParenListExpr. 7495 unsigned NumExprs = Exprs.size(); 7496 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7497 (Expr **)Exprs.release(), 7498 NumExprs, RParenLoc)); 7499 return; 7500 } 7501 7502 // Capture the variable that is being initialized and the style of 7503 // initialization. 7504 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7505 7506 // FIXME: Poor source location information. 7507 InitializationKind Kind 7508 = InitializationKind::CreateDirect(VDecl->getLocation(), 7509 LParenLoc, RParenLoc); 7510 7511 InitializationSequence InitSeq(*this, Entity, Kind, 7512 Exprs.get(), Exprs.size()); 7513 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7514 if (Result.isInvalid()) { 7515 VDecl->setInvalidDecl(); 7516 return; 7517 } 7518 7519 CheckImplicitConversions(Result.get(), LParenLoc); 7520 7521 Result = MaybeCreateExprWithCleanups(Result); 7522 VDecl->setInit(Result.takeAs<Expr>()); 7523 VDecl->setCXXDirectInitializer(true); 7524 7525 CheckCompleteVariableDeclaration(VDecl); 7526} 7527 7528/// \brief Given a constructor and the set of arguments provided for the 7529/// constructor, convert the arguments and add any required default arguments 7530/// to form a proper call to this constructor. 7531/// 7532/// \returns true if an error occurred, false otherwise. 7533bool 7534Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7535 MultiExprArg ArgsPtr, 7536 SourceLocation Loc, 7537 ASTOwningVector<Expr*> &ConvertedArgs) { 7538 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7539 unsigned NumArgs = ArgsPtr.size(); 7540 Expr **Args = (Expr **)ArgsPtr.get(); 7541 7542 const FunctionProtoType *Proto 7543 = Constructor->getType()->getAs<FunctionProtoType>(); 7544 assert(Proto && "Constructor without a prototype?"); 7545 unsigned NumArgsInProto = Proto->getNumArgs(); 7546 7547 // If too few arguments are available, we'll fill in the rest with defaults. 7548 if (NumArgs < NumArgsInProto) 7549 ConvertedArgs.reserve(NumArgsInProto); 7550 else 7551 ConvertedArgs.reserve(NumArgs); 7552 7553 VariadicCallType CallType = 7554 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7555 llvm::SmallVector<Expr *, 8> AllArgs; 7556 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7557 Proto, 0, Args, NumArgs, AllArgs, 7558 CallType); 7559 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7560 ConvertedArgs.push_back(AllArgs[i]); 7561 return Invalid; 7562} 7563 7564static inline bool 7565CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7566 const FunctionDecl *FnDecl) { 7567 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7568 if (isa<NamespaceDecl>(DC)) { 7569 return SemaRef.Diag(FnDecl->getLocation(), 7570 diag::err_operator_new_delete_declared_in_namespace) 7571 << FnDecl->getDeclName(); 7572 } 7573 7574 if (isa<TranslationUnitDecl>(DC) && 7575 FnDecl->getStorageClass() == SC_Static) { 7576 return SemaRef.Diag(FnDecl->getLocation(), 7577 diag::err_operator_new_delete_declared_static) 7578 << FnDecl->getDeclName(); 7579 } 7580 7581 return false; 7582} 7583 7584static inline bool 7585CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7586 CanQualType ExpectedResultType, 7587 CanQualType ExpectedFirstParamType, 7588 unsigned DependentParamTypeDiag, 7589 unsigned InvalidParamTypeDiag) { 7590 QualType ResultType = 7591 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7592 7593 // Check that the result type is not dependent. 7594 if (ResultType->isDependentType()) 7595 return SemaRef.Diag(FnDecl->getLocation(), 7596 diag::err_operator_new_delete_dependent_result_type) 7597 << FnDecl->getDeclName() << ExpectedResultType; 7598 7599 // Check that the result type is what we expect. 7600 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7601 return SemaRef.Diag(FnDecl->getLocation(), 7602 diag::err_operator_new_delete_invalid_result_type) 7603 << FnDecl->getDeclName() << ExpectedResultType; 7604 7605 // A function template must have at least 2 parameters. 7606 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7607 return SemaRef.Diag(FnDecl->getLocation(), 7608 diag::err_operator_new_delete_template_too_few_parameters) 7609 << FnDecl->getDeclName(); 7610 7611 // The function decl must have at least 1 parameter. 7612 if (FnDecl->getNumParams() == 0) 7613 return SemaRef.Diag(FnDecl->getLocation(), 7614 diag::err_operator_new_delete_too_few_parameters) 7615 << FnDecl->getDeclName(); 7616 7617 // Check the the first parameter type is not dependent. 7618 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7619 if (FirstParamType->isDependentType()) 7620 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7621 << FnDecl->getDeclName() << ExpectedFirstParamType; 7622 7623 // Check that the first parameter type is what we expect. 7624 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7625 ExpectedFirstParamType) 7626 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7627 << FnDecl->getDeclName() << ExpectedFirstParamType; 7628 7629 return false; 7630} 7631 7632static bool 7633CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7634 // C++ [basic.stc.dynamic.allocation]p1: 7635 // A program is ill-formed if an allocation function is declared in a 7636 // namespace scope other than global scope or declared static in global 7637 // scope. 7638 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7639 return true; 7640 7641 CanQualType SizeTy = 7642 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7643 7644 // C++ [basic.stc.dynamic.allocation]p1: 7645 // The return type shall be void*. The first parameter shall have type 7646 // std::size_t. 7647 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7648 SizeTy, 7649 diag::err_operator_new_dependent_param_type, 7650 diag::err_operator_new_param_type)) 7651 return true; 7652 7653 // C++ [basic.stc.dynamic.allocation]p1: 7654 // The first parameter shall not have an associated default argument. 7655 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7656 return SemaRef.Diag(FnDecl->getLocation(), 7657 diag::err_operator_new_default_arg) 7658 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7659 7660 return false; 7661} 7662 7663static bool 7664CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7665 // C++ [basic.stc.dynamic.deallocation]p1: 7666 // A program is ill-formed if deallocation functions are declared in a 7667 // namespace scope other than global scope or declared static in global 7668 // scope. 7669 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7670 return true; 7671 7672 // C++ [basic.stc.dynamic.deallocation]p2: 7673 // Each deallocation function shall return void and its first parameter 7674 // shall be void*. 7675 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7676 SemaRef.Context.VoidPtrTy, 7677 diag::err_operator_delete_dependent_param_type, 7678 diag::err_operator_delete_param_type)) 7679 return true; 7680 7681 return false; 7682} 7683 7684/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7685/// of this overloaded operator is well-formed. If so, returns false; 7686/// otherwise, emits appropriate diagnostics and returns true. 7687bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7688 assert(FnDecl && FnDecl->isOverloadedOperator() && 7689 "Expected an overloaded operator declaration"); 7690 7691 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7692 7693 // C++ [over.oper]p5: 7694 // The allocation and deallocation functions, operator new, 7695 // operator new[], operator delete and operator delete[], are 7696 // described completely in 3.7.3. The attributes and restrictions 7697 // found in the rest of this subclause do not apply to them unless 7698 // explicitly stated in 3.7.3. 7699 if (Op == OO_Delete || Op == OO_Array_Delete) 7700 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7701 7702 if (Op == OO_New || Op == OO_Array_New) 7703 return CheckOperatorNewDeclaration(*this, FnDecl); 7704 7705 // C++ [over.oper]p6: 7706 // An operator function shall either be a non-static member 7707 // function or be a non-member function and have at least one 7708 // parameter whose type is a class, a reference to a class, an 7709 // enumeration, or a reference to an enumeration. 7710 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7711 if (MethodDecl->isStatic()) 7712 return Diag(FnDecl->getLocation(), 7713 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7714 } else { 7715 bool ClassOrEnumParam = false; 7716 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7717 ParamEnd = FnDecl->param_end(); 7718 Param != ParamEnd; ++Param) { 7719 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7720 if (ParamType->isDependentType() || ParamType->isRecordType() || 7721 ParamType->isEnumeralType()) { 7722 ClassOrEnumParam = true; 7723 break; 7724 } 7725 } 7726 7727 if (!ClassOrEnumParam) 7728 return Diag(FnDecl->getLocation(), 7729 diag::err_operator_overload_needs_class_or_enum) 7730 << FnDecl->getDeclName(); 7731 } 7732 7733 // C++ [over.oper]p8: 7734 // An operator function cannot have default arguments (8.3.6), 7735 // except where explicitly stated below. 7736 // 7737 // Only the function-call operator allows default arguments 7738 // (C++ [over.call]p1). 7739 if (Op != OO_Call) { 7740 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7741 Param != FnDecl->param_end(); ++Param) { 7742 if ((*Param)->hasDefaultArg()) 7743 return Diag((*Param)->getLocation(), 7744 diag::err_operator_overload_default_arg) 7745 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7746 } 7747 } 7748 7749 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7750 { false, false, false } 7751#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7752 , { Unary, Binary, MemberOnly } 7753#include "clang/Basic/OperatorKinds.def" 7754 }; 7755 7756 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7757 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7758 bool MustBeMemberOperator = OperatorUses[Op][2]; 7759 7760 // C++ [over.oper]p8: 7761 // [...] Operator functions cannot have more or fewer parameters 7762 // than the number required for the corresponding operator, as 7763 // described in the rest of this subclause. 7764 unsigned NumParams = FnDecl->getNumParams() 7765 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7766 if (Op != OO_Call && 7767 ((NumParams == 1 && !CanBeUnaryOperator) || 7768 (NumParams == 2 && !CanBeBinaryOperator) || 7769 (NumParams < 1) || (NumParams > 2))) { 7770 // We have the wrong number of parameters. 7771 unsigned ErrorKind; 7772 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7773 ErrorKind = 2; // 2 -> unary or binary. 7774 } else if (CanBeUnaryOperator) { 7775 ErrorKind = 0; // 0 -> unary 7776 } else { 7777 assert(CanBeBinaryOperator && 7778 "All non-call overloaded operators are unary or binary!"); 7779 ErrorKind = 1; // 1 -> binary 7780 } 7781 7782 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7783 << FnDecl->getDeclName() << NumParams << ErrorKind; 7784 } 7785 7786 // Overloaded operators other than operator() cannot be variadic. 7787 if (Op != OO_Call && 7788 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7789 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7790 << FnDecl->getDeclName(); 7791 } 7792 7793 // Some operators must be non-static member functions. 7794 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7795 return Diag(FnDecl->getLocation(), 7796 diag::err_operator_overload_must_be_member) 7797 << FnDecl->getDeclName(); 7798 } 7799 7800 // C++ [over.inc]p1: 7801 // The user-defined function called operator++ implements the 7802 // prefix and postfix ++ operator. If this function is a member 7803 // function with no parameters, or a non-member function with one 7804 // parameter of class or enumeration type, it defines the prefix 7805 // increment operator ++ for objects of that type. If the function 7806 // is a member function with one parameter (which shall be of type 7807 // int) or a non-member function with two parameters (the second 7808 // of which shall be of type int), it defines the postfix 7809 // increment operator ++ for objects of that type. 7810 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7811 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7812 bool ParamIsInt = false; 7813 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7814 ParamIsInt = BT->getKind() == BuiltinType::Int; 7815 7816 if (!ParamIsInt) 7817 return Diag(LastParam->getLocation(), 7818 diag::err_operator_overload_post_incdec_must_be_int) 7819 << LastParam->getType() << (Op == OO_MinusMinus); 7820 } 7821 7822 return false; 7823} 7824 7825/// CheckLiteralOperatorDeclaration - Check whether the declaration 7826/// of this literal operator function is well-formed. If so, returns 7827/// false; otherwise, emits appropriate diagnostics and returns true. 7828bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7829 DeclContext *DC = FnDecl->getDeclContext(); 7830 Decl::Kind Kind = DC->getDeclKind(); 7831 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7832 Kind != Decl::LinkageSpec) { 7833 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7834 << FnDecl->getDeclName(); 7835 return true; 7836 } 7837 7838 bool Valid = false; 7839 7840 // template <char...> type operator "" name() is the only valid template 7841 // signature, and the only valid signature with no parameters. 7842 if (FnDecl->param_size() == 0) { 7843 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7844 // Must have only one template parameter 7845 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7846 if (Params->size() == 1) { 7847 NonTypeTemplateParmDecl *PmDecl = 7848 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7849 7850 // The template parameter must be a char parameter pack. 7851 if (PmDecl && PmDecl->isTemplateParameterPack() && 7852 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7853 Valid = true; 7854 } 7855 } 7856 } else { 7857 // Check the first parameter 7858 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7859 7860 QualType T = (*Param)->getType(); 7861 7862 // unsigned long long int, long double, and any character type are allowed 7863 // as the only parameters. 7864 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7865 Context.hasSameType(T, Context.LongDoubleTy) || 7866 Context.hasSameType(T, Context.CharTy) || 7867 Context.hasSameType(T, Context.WCharTy) || 7868 Context.hasSameType(T, Context.Char16Ty) || 7869 Context.hasSameType(T, Context.Char32Ty)) { 7870 if (++Param == FnDecl->param_end()) 7871 Valid = true; 7872 goto FinishedParams; 7873 } 7874 7875 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7876 const PointerType *PT = T->getAs<PointerType>(); 7877 if (!PT) 7878 goto FinishedParams; 7879 T = PT->getPointeeType(); 7880 if (!T.isConstQualified()) 7881 goto FinishedParams; 7882 T = T.getUnqualifiedType(); 7883 7884 // Move on to the second parameter; 7885 ++Param; 7886 7887 // If there is no second parameter, the first must be a const char * 7888 if (Param == FnDecl->param_end()) { 7889 if (Context.hasSameType(T, Context.CharTy)) 7890 Valid = true; 7891 goto FinishedParams; 7892 } 7893 7894 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7895 // are allowed as the first parameter to a two-parameter function 7896 if (!(Context.hasSameType(T, Context.CharTy) || 7897 Context.hasSameType(T, Context.WCharTy) || 7898 Context.hasSameType(T, Context.Char16Ty) || 7899 Context.hasSameType(T, Context.Char32Ty))) 7900 goto FinishedParams; 7901 7902 // The second and final parameter must be an std::size_t 7903 T = (*Param)->getType().getUnqualifiedType(); 7904 if (Context.hasSameType(T, Context.getSizeType()) && 7905 ++Param == FnDecl->param_end()) 7906 Valid = true; 7907 } 7908 7909 // FIXME: This diagnostic is absolutely terrible. 7910FinishedParams: 7911 if (!Valid) { 7912 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7913 << FnDecl->getDeclName(); 7914 return true; 7915 } 7916 7917 return false; 7918} 7919 7920/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7921/// linkage specification, including the language and (if present) 7922/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7923/// the location of the language string literal, which is provided 7924/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7925/// the '{' brace. Otherwise, this linkage specification does not 7926/// have any braces. 7927Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7928 SourceLocation LangLoc, 7929 llvm::StringRef Lang, 7930 SourceLocation LBraceLoc) { 7931 LinkageSpecDecl::LanguageIDs Language; 7932 if (Lang == "\"C\"") 7933 Language = LinkageSpecDecl::lang_c; 7934 else if (Lang == "\"C++\"") 7935 Language = LinkageSpecDecl::lang_cxx; 7936 else { 7937 Diag(LangLoc, diag::err_bad_language); 7938 return 0; 7939 } 7940 7941 // FIXME: Add all the various semantics of linkage specifications 7942 7943 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7944 ExternLoc, LangLoc, Language); 7945 CurContext->addDecl(D); 7946 PushDeclContext(S, D); 7947 return D; 7948} 7949 7950/// ActOnFinishLinkageSpecification - Complete the definition of 7951/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7952/// valid, it's the position of the closing '}' brace in a linkage 7953/// specification that uses braces. 7954Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7955 Decl *LinkageSpec, 7956 SourceLocation RBraceLoc) { 7957 if (LinkageSpec) { 7958 if (RBraceLoc.isValid()) { 7959 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7960 LSDecl->setRBraceLoc(RBraceLoc); 7961 } 7962 PopDeclContext(); 7963 } 7964 return LinkageSpec; 7965} 7966 7967/// \brief Perform semantic analysis for the variable declaration that 7968/// occurs within a C++ catch clause, returning the newly-created 7969/// variable. 7970VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7971 TypeSourceInfo *TInfo, 7972 SourceLocation StartLoc, 7973 SourceLocation Loc, 7974 IdentifierInfo *Name) { 7975 bool Invalid = false; 7976 QualType ExDeclType = TInfo->getType(); 7977 7978 // Arrays and functions decay. 7979 if (ExDeclType->isArrayType()) 7980 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7981 else if (ExDeclType->isFunctionType()) 7982 ExDeclType = Context.getPointerType(ExDeclType); 7983 7984 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7985 // The exception-declaration shall not denote a pointer or reference to an 7986 // incomplete type, other than [cv] void*. 7987 // N2844 forbids rvalue references. 7988 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7989 Diag(Loc, diag::err_catch_rvalue_ref); 7990 Invalid = true; 7991 } 7992 7993 // GCC allows catching pointers and references to incomplete types 7994 // as an extension; so do we, but we warn by default. 7995 7996 QualType BaseType = ExDeclType; 7997 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7998 unsigned DK = diag::err_catch_incomplete; 7999 bool IncompleteCatchIsInvalid = true; 8000 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8001 BaseType = Ptr->getPointeeType(); 8002 Mode = 1; 8003 DK = diag::ext_catch_incomplete_ptr; 8004 IncompleteCatchIsInvalid = false; 8005 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8006 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8007 BaseType = Ref->getPointeeType(); 8008 Mode = 2; 8009 DK = diag::ext_catch_incomplete_ref; 8010 IncompleteCatchIsInvalid = false; 8011 } 8012 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8013 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8014 IncompleteCatchIsInvalid) 8015 Invalid = true; 8016 8017 if (!Invalid && !ExDeclType->isDependentType() && 8018 RequireNonAbstractType(Loc, ExDeclType, 8019 diag::err_abstract_type_in_decl, 8020 AbstractVariableType)) 8021 Invalid = true; 8022 8023 // Only the non-fragile NeXT runtime currently supports C++ catches 8024 // of ObjC types, and no runtime supports catching ObjC types by value. 8025 if (!Invalid && getLangOptions().ObjC1) { 8026 QualType T = ExDeclType; 8027 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8028 T = RT->getPointeeType(); 8029 8030 if (T->isObjCObjectType()) { 8031 Diag(Loc, diag::err_objc_object_catch); 8032 Invalid = true; 8033 } else if (T->isObjCObjectPointerType()) { 8034 if (!getLangOptions().ObjCNonFragileABI) { 8035 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 8036 Invalid = true; 8037 } 8038 } 8039 } 8040 8041 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8042 ExDeclType, TInfo, SC_None, SC_None); 8043 ExDecl->setExceptionVariable(true); 8044 8045 if (!Invalid) { 8046 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8047 // C++ [except.handle]p16: 8048 // The object declared in an exception-declaration or, if the 8049 // exception-declaration does not specify a name, a temporary (12.2) is 8050 // copy-initialized (8.5) from the exception object. [...] 8051 // The object is destroyed when the handler exits, after the destruction 8052 // of any automatic objects initialized within the handler. 8053 // 8054 // We just pretend to initialize the object with itself, then make sure 8055 // it can be destroyed later. 8056 QualType initType = ExDeclType; 8057 8058 InitializedEntity entity = 8059 InitializedEntity::InitializeVariable(ExDecl); 8060 InitializationKind initKind = 8061 InitializationKind::CreateCopy(Loc, SourceLocation()); 8062 8063 Expr *opaqueValue = 8064 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8065 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8066 ExprResult result = sequence.Perform(*this, entity, initKind, 8067 MultiExprArg(&opaqueValue, 1)); 8068 if (result.isInvalid()) 8069 Invalid = true; 8070 else { 8071 // If the constructor used was non-trivial, set this as the 8072 // "initializer". 8073 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8074 if (!construct->getConstructor()->isTrivial()) { 8075 Expr *init = MaybeCreateExprWithCleanups(construct); 8076 ExDecl->setInit(init); 8077 } 8078 8079 // And make sure it's destructable. 8080 FinalizeVarWithDestructor(ExDecl, recordType); 8081 } 8082 } 8083 } 8084 8085 if (Invalid) 8086 ExDecl->setInvalidDecl(); 8087 8088 return ExDecl; 8089} 8090 8091/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8092/// handler. 8093Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8094 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8095 bool Invalid = D.isInvalidType(); 8096 8097 // Check for unexpanded parameter packs. 8098 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8099 UPPC_ExceptionType)) { 8100 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8101 D.getIdentifierLoc()); 8102 Invalid = true; 8103 } 8104 8105 IdentifierInfo *II = D.getIdentifier(); 8106 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8107 LookupOrdinaryName, 8108 ForRedeclaration)) { 8109 // The scope should be freshly made just for us. There is just no way 8110 // it contains any previous declaration. 8111 assert(!S->isDeclScope(PrevDecl)); 8112 if (PrevDecl->isTemplateParameter()) { 8113 // Maybe we will complain about the shadowed template parameter. 8114 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8115 } 8116 } 8117 8118 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8119 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8120 << D.getCXXScopeSpec().getRange(); 8121 Invalid = true; 8122 } 8123 8124 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8125 D.getSourceRange().getBegin(), 8126 D.getIdentifierLoc(), 8127 D.getIdentifier()); 8128 if (Invalid) 8129 ExDecl->setInvalidDecl(); 8130 8131 // Add the exception declaration into this scope. 8132 if (II) 8133 PushOnScopeChains(ExDecl, S); 8134 else 8135 CurContext->addDecl(ExDecl); 8136 8137 ProcessDeclAttributes(S, ExDecl, D); 8138 return ExDecl; 8139} 8140 8141Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8142 Expr *AssertExpr, 8143 Expr *AssertMessageExpr_, 8144 SourceLocation RParenLoc) { 8145 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8146 8147 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8148 llvm::APSInt Value(32); 8149 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8150 Diag(StaticAssertLoc, 8151 diag::err_static_assert_expression_is_not_constant) << 8152 AssertExpr->getSourceRange(); 8153 return 0; 8154 } 8155 8156 if (Value == 0) { 8157 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8158 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8159 } 8160 } 8161 8162 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8163 return 0; 8164 8165 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8166 AssertExpr, AssertMessage, RParenLoc); 8167 8168 CurContext->addDecl(Decl); 8169 return Decl; 8170} 8171 8172/// \brief Perform semantic analysis of the given friend type declaration. 8173/// 8174/// \returns A friend declaration that. 8175FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8176 TypeSourceInfo *TSInfo) { 8177 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8178 8179 QualType T = TSInfo->getType(); 8180 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8181 8182 if (!getLangOptions().CPlusPlus0x) { 8183 // C++03 [class.friend]p2: 8184 // An elaborated-type-specifier shall be used in a friend declaration 8185 // for a class.* 8186 // 8187 // * The class-key of the elaborated-type-specifier is required. 8188 if (!ActiveTemplateInstantiations.empty()) { 8189 // Do not complain about the form of friend template types during 8190 // template instantiation; we will already have complained when the 8191 // template was declared. 8192 } else if (!T->isElaboratedTypeSpecifier()) { 8193 // If we evaluated the type to a record type, suggest putting 8194 // a tag in front. 8195 if (const RecordType *RT = T->getAs<RecordType>()) { 8196 RecordDecl *RD = RT->getDecl(); 8197 8198 std::string InsertionText = std::string(" ") + RD->getKindName(); 8199 8200 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8201 << (unsigned) RD->getTagKind() 8202 << T 8203 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8204 InsertionText); 8205 } else { 8206 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8207 << T 8208 << SourceRange(FriendLoc, TypeRange.getEnd()); 8209 } 8210 } else if (T->getAs<EnumType>()) { 8211 Diag(FriendLoc, diag::ext_enum_friend) 8212 << T 8213 << SourceRange(FriendLoc, TypeRange.getEnd()); 8214 } 8215 } 8216 8217 // C++0x [class.friend]p3: 8218 // If the type specifier in a friend declaration designates a (possibly 8219 // cv-qualified) class type, that class is declared as a friend; otherwise, 8220 // the friend declaration is ignored. 8221 8222 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8223 // in [class.friend]p3 that we do not implement. 8224 8225 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8226} 8227 8228/// Handle a friend tag declaration where the scope specifier was 8229/// templated. 8230Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8231 unsigned TagSpec, SourceLocation TagLoc, 8232 CXXScopeSpec &SS, 8233 IdentifierInfo *Name, SourceLocation NameLoc, 8234 AttributeList *Attr, 8235 MultiTemplateParamsArg TempParamLists) { 8236 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8237 8238 bool isExplicitSpecialization = false; 8239 bool Invalid = false; 8240 8241 if (TemplateParameterList *TemplateParams 8242 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8243 TempParamLists.get(), 8244 TempParamLists.size(), 8245 /*friend*/ true, 8246 isExplicitSpecialization, 8247 Invalid)) { 8248 if (TemplateParams->size() > 0) { 8249 // This is a declaration of a class template. 8250 if (Invalid) 8251 return 0; 8252 8253 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8254 SS, Name, NameLoc, Attr, 8255 TemplateParams, AS_public, 8256 TempParamLists.size() - 1, 8257 (TemplateParameterList**) TempParamLists.release()).take(); 8258 } else { 8259 // The "template<>" header is extraneous. 8260 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8261 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8262 isExplicitSpecialization = true; 8263 } 8264 } 8265 8266 if (Invalid) return 0; 8267 8268 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8269 8270 bool isAllExplicitSpecializations = true; 8271 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8272 if (TempParamLists.get()[I]->size()) { 8273 isAllExplicitSpecializations = false; 8274 break; 8275 } 8276 } 8277 8278 // FIXME: don't ignore attributes. 8279 8280 // If it's explicit specializations all the way down, just forget 8281 // about the template header and build an appropriate non-templated 8282 // friend. TODO: for source fidelity, remember the headers. 8283 if (isAllExplicitSpecializations) { 8284 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8285 ElaboratedTypeKeyword Keyword 8286 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8287 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8288 *Name, NameLoc); 8289 if (T.isNull()) 8290 return 0; 8291 8292 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8293 if (isa<DependentNameType>(T)) { 8294 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8295 TL.setKeywordLoc(TagLoc); 8296 TL.setQualifierLoc(QualifierLoc); 8297 TL.setNameLoc(NameLoc); 8298 } else { 8299 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8300 TL.setKeywordLoc(TagLoc); 8301 TL.setQualifierLoc(QualifierLoc); 8302 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8303 } 8304 8305 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8306 TSI, FriendLoc); 8307 Friend->setAccess(AS_public); 8308 CurContext->addDecl(Friend); 8309 return Friend; 8310 } 8311 8312 // Handle the case of a templated-scope friend class. e.g. 8313 // template <class T> class A<T>::B; 8314 // FIXME: we don't support these right now. 8315 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8316 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8317 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8318 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8319 TL.setKeywordLoc(TagLoc); 8320 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8321 TL.setNameLoc(NameLoc); 8322 8323 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8324 TSI, FriendLoc); 8325 Friend->setAccess(AS_public); 8326 Friend->setUnsupportedFriend(true); 8327 CurContext->addDecl(Friend); 8328 return Friend; 8329} 8330 8331 8332/// Handle a friend type declaration. This works in tandem with 8333/// ActOnTag. 8334/// 8335/// Notes on friend class templates: 8336/// 8337/// We generally treat friend class declarations as if they were 8338/// declaring a class. So, for example, the elaborated type specifier 8339/// in a friend declaration is required to obey the restrictions of a 8340/// class-head (i.e. no typedefs in the scope chain), template 8341/// parameters are required to match up with simple template-ids, &c. 8342/// However, unlike when declaring a template specialization, it's 8343/// okay to refer to a template specialization without an empty 8344/// template parameter declaration, e.g. 8345/// friend class A<T>::B<unsigned>; 8346/// We permit this as a special case; if there are any template 8347/// parameters present at all, require proper matching, i.e. 8348/// template <> template <class T> friend class A<int>::B; 8349Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8350 MultiTemplateParamsArg TempParams) { 8351 SourceLocation Loc = DS.getSourceRange().getBegin(); 8352 8353 assert(DS.isFriendSpecified()); 8354 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8355 8356 // Try to convert the decl specifier to a type. This works for 8357 // friend templates because ActOnTag never produces a ClassTemplateDecl 8358 // for a TUK_Friend. 8359 Declarator TheDeclarator(DS, Declarator::MemberContext); 8360 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8361 QualType T = TSI->getType(); 8362 if (TheDeclarator.isInvalidType()) 8363 return 0; 8364 8365 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8366 return 0; 8367 8368 // This is definitely an error in C++98. It's probably meant to 8369 // be forbidden in C++0x, too, but the specification is just 8370 // poorly written. 8371 // 8372 // The problem is with declarations like the following: 8373 // template <T> friend A<T>::foo; 8374 // where deciding whether a class C is a friend or not now hinges 8375 // on whether there exists an instantiation of A that causes 8376 // 'foo' to equal C. There are restrictions on class-heads 8377 // (which we declare (by fiat) elaborated friend declarations to 8378 // be) that makes this tractable. 8379 // 8380 // FIXME: handle "template <> friend class A<T>;", which 8381 // is possibly well-formed? Who even knows? 8382 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8383 Diag(Loc, diag::err_tagless_friend_type_template) 8384 << DS.getSourceRange(); 8385 return 0; 8386 } 8387 8388 // C++98 [class.friend]p1: A friend of a class is a function 8389 // or class that is not a member of the class . . . 8390 // This is fixed in DR77, which just barely didn't make the C++03 8391 // deadline. It's also a very silly restriction that seriously 8392 // affects inner classes and which nobody else seems to implement; 8393 // thus we never diagnose it, not even in -pedantic. 8394 // 8395 // But note that we could warn about it: it's always useless to 8396 // friend one of your own members (it's not, however, worthless to 8397 // friend a member of an arbitrary specialization of your template). 8398 8399 Decl *D; 8400 if (unsigned NumTempParamLists = TempParams.size()) 8401 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8402 NumTempParamLists, 8403 TempParams.release(), 8404 TSI, 8405 DS.getFriendSpecLoc()); 8406 else 8407 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8408 8409 if (!D) 8410 return 0; 8411 8412 D->setAccess(AS_public); 8413 CurContext->addDecl(D); 8414 8415 return D; 8416} 8417 8418Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8419 MultiTemplateParamsArg TemplateParams) { 8420 const DeclSpec &DS = D.getDeclSpec(); 8421 8422 assert(DS.isFriendSpecified()); 8423 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8424 8425 SourceLocation Loc = D.getIdentifierLoc(); 8426 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8427 QualType T = TInfo->getType(); 8428 8429 // C++ [class.friend]p1 8430 // A friend of a class is a function or class.... 8431 // Note that this sees through typedefs, which is intended. 8432 // It *doesn't* see through dependent types, which is correct 8433 // according to [temp.arg.type]p3: 8434 // If a declaration acquires a function type through a 8435 // type dependent on a template-parameter and this causes 8436 // a declaration that does not use the syntactic form of a 8437 // function declarator to have a function type, the program 8438 // is ill-formed. 8439 if (!T->isFunctionType()) { 8440 Diag(Loc, diag::err_unexpected_friend); 8441 8442 // It might be worthwhile to try to recover by creating an 8443 // appropriate declaration. 8444 return 0; 8445 } 8446 8447 // C++ [namespace.memdef]p3 8448 // - If a friend declaration in a non-local class first declares a 8449 // class or function, the friend class or function is a member 8450 // of the innermost enclosing namespace. 8451 // - The name of the friend is not found by simple name lookup 8452 // until a matching declaration is provided in that namespace 8453 // scope (either before or after the class declaration granting 8454 // friendship). 8455 // - If a friend function is called, its name may be found by the 8456 // name lookup that considers functions from namespaces and 8457 // classes associated with the types of the function arguments. 8458 // - When looking for a prior declaration of a class or a function 8459 // declared as a friend, scopes outside the innermost enclosing 8460 // namespace scope are not considered. 8461 8462 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8463 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8464 DeclarationName Name = NameInfo.getName(); 8465 assert(Name); 8466 8467 // Check for unexpanded parameter packs. 8468 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8469 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8470 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8471 return 0; 8472 8473 // The context we found the declaration in, or in which we should 8474 // create the declaration. 8475 DeclContext *DC; 8476 Scope *DCScope = S; 8477 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8478 ForRedeclaration); 8479 8480 // FIXME: there are different rules in local classes 8481 8482 // There are four cases here. 8483 // - There's no scope specifier, in which case we just go to the 8484 // appropriate scope and look for a function or function template 8485 // there as appropriate. 8486 // Recover from invalid scope qualifiers as if they just weren't there. 8487 if (SS.isInvalid() || !SS.isSet()) { 8488 // C++0x [namespace.memdef]p3: 8489 // If the name in a friend declaration is neither qualified nor 8490 // a template-id and the declaration is a function or an 8491 // elaborated-type-specifier, the lookup to determine whether 8492 // the entity has been previously declared shall not consider 8493 // any scopes outside the innermost enclosing namespace. 8494 // C++0x [class.friend]p11: 8495 // If a friend declaration appears in a local class and the name 8496 // specified is an unqualified name, a prior declaration is 8497 // looked up without considering scopes that are outside the 8498 // innermost enclosing non-class scope. For a friend function 8499 // declaration, if there is no prior declaration, the program is 8500 // ill-formed. 8501 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8502 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8503 8504 // Find the appropriate context according to the above. 8505 DC = CurContext; 8506 while (true) { 8507 // Skip class contexts. If someone can cite chapter and verse 8508 // for this behavior, that would be nice --- it's what GCC and 8509 // EDG do, and it seems like a reasonable intent, but the spec 8510 // really only says that checks for unqualified existing 8511 // declarations should stop at the nearest enclosing namespace, 8512 // not that they should only consider the nearest enclosing 8513 // namespace. 8514 while (DC->isRecord()) 8515 DC = DC->getParent(); 8516 8517 LookupQualifiedName(Previous, DC); 8518 8519 // TODO: decide what we think about using declarations. 8520 if (isLocal || !Previous.empty()) 8521 break; 8522 8523 if (isTemplateId) { 8524 if (isa<TranslationUnitDecl>(DC)) break; 8525 } else { 8526 if (DC->isFileContext()) break; 8527 } 8528 DC = DC->getParent(); 8529 } 8530 8531 // C++ [class.friend]p1: A friend of a class is a function or 8532 // class that is not a member of the class . . . 8533 // C++0x changes this for both friend types and functions. 8534 // Most C++ 98 compilers do seem to give an error here, so 8535 // we do, too. 8536 if (!Previous.empty() && DC->Equals(CurContext) 8537 && !getLangOptions().CPlusPlus0x) 8538 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8539 8540 DCScope = getScopeForDeclContext(S, DC); 8541 8542 // - There's a non-dependent scope specifier, in which case we 8543 // compute it and do a previous lookup there for a function 8544 // or function template. 8545 } else if (!SS.getScopeRep()->isDependent()) { 8546 DC = computeDeclContext(SS); 8547 if (!DC) return 0; 8548 8549 if (RequireCompleteDeclContext(SS, DC)) return 0; 8550 8551 LookupQualifiedName(Previous, DC); 8552 8553 // Ignore things found implicitly in the wrong scope. 8554 // TODO: better diagnostics for this case. Suggesting the right 8555 // qualified scope would be nice... 8556 LookupResult::Filter F = Previous.makeFilter(); 8557 while (F.hasNext()) { 8558 NamedDecl *D = F.next(); 8559 if (!DC->InEnclosingNamespaceSetOf( 8560 D->getDeclContext()->getRedeclContext())) 8561 F.erase(); 8562 } 8563 F.done(); 8564 8565 if (Previous.empty()) { 8566 D.setInvalidType(); 8567 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8568 return 0; 8569 } 8570 8571 // C++ [class.friend]p1: A friend of a class is a function or 8572 // class that is not a member of the class . . . 8573 if (DC->Equals(CurContext)) 8574 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8575 8576 // - There's a scope specifier that does not match any template 8577 // parameter lists, in which case we use some arbitrary context, 8578 // create a method or method template, and wait for instantiation. 8579 // - There's a scope specifier that does match some template 8580 // parameter lists, which we don't handle right now. 8581 } else { 8582 DC = CurContext; 8583 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8584 } 8585 8586 if (!DC->isRecord()) { 8587 // This implies that it has to be an operator or function. 8588 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8589 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8590 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8591 Diag(Loc, diag::err_introducing_special_friend) << 8592 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8593 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8594 return 0; 8595 } 8596 } 8597 8598 bool Redeclaration = false; 8599 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8600 move(TemplateParams), 8601 IsDefinition, 8602 Redeclaration); 8603 if (!ND) return 0; 8604 8605 assert(ND->getDeclContext() == DC); 8606 assert(ND->getLexicalDeclContext() == CurContext); 8607 8608 // Add the function declaration to the appropriate lookup tables, 8609 // adjusting the redeclarations list as necessary. We don't 8610 // want to do this yet if the friending class is dependent. 8611 // 8612 // Also update the scope-based lookup if the target context's 8613 // lookup context is in lexical scope. 8614 if (!CurContext->isDependentContext()) { 8615 DC = DC->getRedeclContext(); 8616 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8617 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8618 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8619 } 8620 8621 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8622 D.getIdentifierLoc(), ND, 8623 DS.getFriendSpecLoc()); 8624 FrD->setAccess(AS_public); 8625 CurContext->addDecl(FrD); 8626 8627 if (ND->isInvalidDecl()) 8628 FrD->setInvalidDecl(); 8629 else { 8630 FunctionDecl *FD; 8631 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8632 FD = FTD->getTemplatedDecl(); 8633 else 8634 FD = cast<FunctionDecl>(ND); 8635 8636 // Mark templated-scope function declarations as unsupported. 8637 if (FD->getNumTemplateParameterLists()) 8638 FrD->setUnsupportedFriend(true); 8639 } 8640 8641 return ND; 8642} 8643 8644void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8645 AdjustDeclIfTemplate(Dcl); 8646 8647 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8648 if (!Fn) { 8649 Diag(DelLoc, diag::err_deleted_non_function); 8650 return; 8651 } 8652 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8653 Diag(DelLoc, diag::err_deleted_decl_not_first); 8654 Diag(Prev->getLocation(), diag::note_previous_declaration); 8655 // If the declaration wasn't the first, we delete the function anyway for 8656 // recovery. 8657 } 8658 Fn->setDeletedAsWritten(); 8659} 8660 8661void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8662 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8663 8664 if (MD) { 8665 if (MD->getParent()->isDependentType()) { 8666 MD->setDefaulted(); 8667 MD->setExplicitlyDefaulted(); 8668 return; 8669 } 8670 8671 CXXSpecialMember Member = getSpecialMember(MD); 8672 if (Member == CXXInvalid) { 8673 Diag(DefaultLoc, diag::err_default_special_members); 8674 return; 8675 } 8676 8677 MD->setDefaulted(); 8678 MD->setExplicitlyDefaulted(); 8679 8680 // If this definition appears within the record, do the checking when 8681 // the record is complete. 8682 const FunctionDecl *Primary = MD; 8683 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8684 // Find the uninstantiated declaration that actually had the '= default' 8685 // on it. 8686 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8687 8688 if (Primary == Primary->getCanonicalDecl()) 8689 return; 8690 8691 switch (Member) { 8692 case CXXDefaultConstructor: { 8693 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8694 CheckExplicitlyDefaultedDefaultConstructor(CD); 8695 if (!CD->isInvalidDecl()) 8696 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8697 break; 8698 } 8699 8700 case CXXCopyConstructor: { 8701 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8702 CheckExplicitlyDefaultedCopyConstructor(CD); 8703 if (!CD->isInvalidDecl()) 8704 DefineImplicitCopyConstructor(DefaultLoc, CD); 8705 break; 8706 } 8707 8708 case CXXCopyAssignment: { 8709 CheckExplicitlyDefaultedCopyAssignment(MD); 8710 if (!MD->isInvalidDecl()) 8711 DefineImplicitCopyAssignment(DefaultLoc, MD); 8712 break; 8713 } 8714 8715 case CXXDestructor: { 8716 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8717 CheckExplicitlyDefaultedDestructor(DD); 8718 if (!DD->isInvalidDecl()) 8719 DefineImplicitDestructor(DefaultLoc, DD); 8720 break; 8721 } 8722 8723 case CXXMoveConstructor: 8724 case CXXMoveAssignment: 8725 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8726 break; 8727 8728 default: 8729 // FIXME: Do the rest once we have move functions 8730 break; 8731 } 8732 } else { 8733 Diag(DefaultLoc, diag::err_default_special_members); 8734 } 8735} 8736 8737static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8738 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8739 Stmt *SubStmt = *CI; 8740 if (!SubStmt) 8741 continue; 8742 if (isa<ReturnStmt>(SubStmt)) 8743 Self.Diag(SubStmt->getSourceRange().getBegin(), 8744 diag::err_return_in_constructor_handler); 8745 if (!isa<Expr>(SubStmt)) 8746 SearchForReturnInStmt(Self, SubStmt); 8747 } 8748} 8749 8750void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8751 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8752 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8753 SearchForReturnInStmt(*this, Handler); 8754 } 8755} 8756 8757bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8758 const CXXMethodDecl *Old) { 8759 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8760 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8761 8762 if (Context.hasSameType(NewTy, OldTy) || 8763 NewTy->isDependentType() || OldTy->isDependentType()) 8764 return false; 8765 8766 // Check if the return types are covariant 8767 QualType NewClassTy, OldClassTy; 8768 8769 /// Both types must be pointers or references to classes. 8770 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8771 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8772 NewClassTy = NewPT->getPointeeType(); 8773 OldClassTy = OldPT->getPointeeType(); 8774 } 8775 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8776 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8777 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8778 NewClassTy = NewRT->getPointeeType(); 8779 OldClassTy = OldRT->getPointeeType(); 8780 } 8781 } 8782 } 8783 8784 // The return types aren't either both pointers or references to a class type. 8785 if (NewClassTy.isNull()) { 8786 Diag(New->getLocation(), 8787 diag::err_different_return_type_for_overriding_virtual_function) 8788 << New->getDeclName() << NewTy << OldTy; 8789 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8790 8791 return true; 8792 } 8793 8794 // C++ [class.virtual]p6: 8795 // If the return type of D::f differs from the return type of B::f, the 8796 // class type in the return type of D::f shall be complete at the point of 8797 // declaration of D::f or shall be the class type D. 8798 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8799 if (!RT->isBeingDefined() && 8800 RequireCompleteType(New->getLocation(), NewClassTy, 8801 PDiag(diag::err_covariant_return_incomplete) 8802 << New->getDeclName())) 8803 return true; 8804 } 8805 8806 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8807 // Check if the new class derives from the old class. 8808 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8809 Diag(New->getLocation(), 8810 diag::err_covariant_return_not_derived) 8811 << New->getDeclName() << NewTy << OldTy; 8812 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8813 return true; 8814 } 8815 8816 // Check if we the conversion from derived to base is valid. 8817 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8818 diag::err_covariant_return_inaccessible_base, 8819 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8820 // FIXME: Should this point to the return type? 8821 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8822 // FIXME: this note won't trigger for delayed access control 8823 // diagnostics, and it's impossible to get an undelayed error 8824 // here from access control during the original parse because 8825 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8826 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8827 return true; 8828 } 8829 } 8830 8831 // The qualifiers of the return types must be the same. 8832 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8833 Diag(New->getLocation(), 8834 diag::err_covariant_return_type_different_qualifications) 8835 << New->getDeclName() << NewTy << OldTy; 8836 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8837 return true; 8838 }; 8839 8840 8841 // The new class type must have the same or less qualifiers as the old type. 8842 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8843 Diag(New->getLocation(), 8844 diag::err_covariant_return_type_class_type_more_qualified) 8845 << New->getDeclName() << NewTy << OldTy; 8846 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8847 return true; 8848 }; 8849 8850 return false; 8851} 8852 8853/// \brief Mark the given method pure. 8854/// 8855/// \param Method the method to be marked pure. 8856/// 8857/// \param InitRange the source range that covers the "0" initializer. 8858bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8859 SourceLocation EndLoc = InitRange.getEnd(); 8860 if (EndLoc.isValid()) 8861 Method->setRangeEnd(EndLoc); 8862 8863 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8864 Method->setPure(); 8865 return false; 8866 } 8867 8868 if (!Method->isInvalidDecl()) 8869 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8870 << Method->getDeclName() << InitRange; 8871 return true; 8872} 8873 8874/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8875/// an initializer for the out-of-line declaration 'Dcl'. The scope 8876/// is a fresh scope pushed for just this purpose. 8877/// 8878/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8879/// static data member of class X, names should be looked up in the scope of 8880/// class X. 8881void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8882 // If there is no declaration, there was an error parsing it. 8883 if (D == 0 || D->isInvalidDecl()) return; 8884 8885 // We should only get called for declarations with scope specifiers, like: 8886 // int foo::bar; 8887 assert(D->isOutOfLine()); 8888 EnterDeclaratorContext(S, D->getDeclContext()); 8889} 8890 8891/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8892/// initializer for the out-of-line declaration 'D'. 8893void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8894 // If there is no declaration, there was an error parsing it. 8895 if (D == 0 || D->isInvalidDecl()) return; 8896 8897 assert(D->isOutOfLine()); 8898 ExitDeclaratorContext(S); 8899} 8900 8901/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8902/// C++ if/switch/while/for statement. 8903/// e.g: "if (int x = f()) {...}" 8904DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8905 // C++ 6.4p2: 8906 // The declarator shall not specify a function or an array. 8907 // The type-specifier-seq shall not contain typedef and shall not declare a 8908 // new class or enumeration. 8909 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8910 "Parser allowed 'typedef' as storage class of condition decl."); 8911 8912 TagDecl *OwnedTag = 0; 8913 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8914 QualType Ty = TInfo->getType(); 8915 8916 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8917 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8918 // would be created and CXXConditionDeclExpr wants a VarDecl. 8919 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8920 << D.getSourceRange(); 8921 return DeclResult(); 8922 } else if (OwnedTag && OwnedTag->isDefinition()) { 8923 // The type-specifier-seq shall not declare a new class or enumeration. 8924 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8925 } 8926 8927 Decl *Dcl = ActOnDeclarator(S, D); 8928 if (!Dcl) 8929 return DeclResult(); 8930 8931 return Dcl; 8932} 8933 8934void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8935 bool DefinitionRequired) { 8936 // Ignore any vtable uses in unevaluated operands or for classes that do 8937 // not have a vtable. 8938 if (!Class->isDynamicClass() || Class->isDependentContext() || 8939 CurContext->isDependentContext() || 8940 ExprEvalContexts.back().Context == Unevaluated) 8941 return; 8942 8943 // Try to insert this class into the map. 8944 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8945 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8946 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8947 if (!Pos.second) { 8948 // If we already had an entry, check to see if we are promoting this vtable 8949 // to required a definition. If so, we need to reappend to the VTableUses 8950 // list, since we may have already processed the first entry. 8951 if (DefinitionRequired && !Pos.first->second) { 8952 Pos.first->second = true; 8953 } else { 8954 // Otherwise, we can early exit. 8955 return; 8956 } 8957 } 8958 8959 // Local classes need to have their virtual members marked 8960 // immediately. For all other classes, we mark their virtual members 8961 // at the end of the translation unit. 8962 if (Class->isLocalClass()) 8963 MarkVirtualMembersReferenced(Loc, Class); 8964 else 8965 VTableUses.push_back(std::make_pair(Class, Loc)); 8966} 8967 8968bool Sema::DefineUsedVTables() { 8969 if (VTableUses.empty()) 8970 return false; 8971 8972 // Note: The VTableUses vector could grow as a result of marking 8973 // the members of a class as "used", so we check the size each 8974 // time through the loop and prefer indices (with are stable) to 8975 // iterators (which are not). 8976 bool DefinedAnything = false; 8977 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8978 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8979 if (!Class) 8980 continue; 8981 8982 SourceLocation Loc = VTableUses[I].second; 8983 8984 // If this class has a key function, but that key function is 8985 // defined in another translation unit, we don't need to emit the 8986 // vtable even though we're using it. 8987 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8988 if (KeyFunction && !KeyFunction->hasBody()) { 8989 switch (KeyFunction->getTemplateSpecializationKind()) { 8990 case TSK_Undeclared: 8991 case TSK_ExplicitSpecialization: 8992 case TSK_ExplicitInstantiationDeclaration: 8993 // The key function is in another translation unit. 8994 continue; 8995 8996 case TSK_ExplicitInstantiationDefinition: 8997 case TSK_ImplicitInstantiation: 8998 // We will be instantiating the key function. 8999 break; 9000 } 9001 } else if (!KeyFunction) { 9002 // If we have a class with no key function that is the subject 9003 // of an explicit instantiation declaration, suppress the 9004 // vtable; it will live with the explicit instantiation 9005 // definition. 9006 bool IsExplicitInstantiationDeclaration 9007 = Class->getTemplateSpecializationKind() 9008 == TSK_ExplicitInstantiationDeclaration; 9009 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9010 REnd = Class->redecls_end(); 9011 R != REnd; ++R) { 9012 TemplateSpecializationKind TSK 9013 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9014 if (TSK == TSK_ExplicitInstantiationDeclaration) 9015 IsExplicitInstantiationDeclaration = true; 9016 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9017 IsExplicitInstantiationDeclaration = false; 9018 break; 9019 } 9020 } 9021 9022 if (IsExplicitInstantiationDeclaration) 9023 continue; 9024 } 9025 9026 // Mark all of the virtual members of this class as referenced, so 9027 // that we can build a vtable. Then, tell the AST consumer that a 9028 // vtable for this class is required. 9029 DefinedAnything = true; 9030 MarkVirtualMembersReferenced(Loc, Class); 9031 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9032 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9033 9034 // Optionally warn if we're emitting a weak vtable. 9035 if (Class->getLinkage() == ExternalLinkage && 9036 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9037 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9038 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9039 } 9040 } 9041 VTableUses.clear(); 9042 9043 return DefinedAnything; 9044} 9045 9046void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9047 const CXXRecordDecl *RD) { 9048 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9049 e = RD->method_end(); i != e; ++i) { 9050 CXXMethodDecl *MD = *i; 9051 9052 // C++ [basic.def.odr]p2: 9053 // [...] A virtual member function is used if it is not pure. [...] 9054 if (MD->isVirtual() && !MD->isPure()) 9055 MarkDeclarationReferenced(Loc, MD); 9056 } 9057 9058 // Only classes that have virtual bases need a VTT. 9059 if (RD->getNumVBases() == 0) 9060 return; 9061 9062 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9063 e = RD->bases_end(); i != e; ++i) { 9064 const CXXRecordDecl *Base = 9065 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9066 if (Base->getNumVBases() == 0) 9067 continue; 9068 MarkVirtualMembersReferenced(Loc, Base); 9069 } 9070} 9071 9072/// SetIvarInitializers - This routine builds initialization ASTs for the 9073/// Objective-C implementation whose ivars need be initialized. 9074void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9075 if (!getLangOptions().CPlusPlus) 9076 return; 9077 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9078 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9079 CollectIvarsToConstructOrDestruct(OID, ivars); 9080 if (ivars.empty()) 9081 return; 9082 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9083 for (unsigned i = 0; i < ivars.size(); i++) { 9084 FieldDecl *Field = ivars[i]; 9085 if (Field->isInvalidDecl()) 9086 continue; 9087 9088 CXXCtorInitializer *Member; 9089 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9090 InitializationKind InitKind = 9091 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9092 9093 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9094 ExprResult MemberInit = 9095 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9096 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9097 // Note, MemberInit could actually come back empty if no initialization 9098 // is required (e.g., because it would call a trivial default constructor) 9099 if (!MemberInit.get() || MemberInit.isInvalid()) 9100 continue; 9101 9102 Member = 9103 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9104 SourceLocation(), 9105 MemberInit.takeAs<Expr>(), 9106 SourceLocation()); 9107 AllToInit.push_back(Member); 9108 9109 // Be sure that the destructor is accessible and is marked as referenced. 9110 if (const RecordType *RecordTy 9111 = Context.getBaseElementType(Field->getType()) 9112 ->getAs<RecordType>()) { 9113 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9114 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9115 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9116 CheckDestructorAccess(Field->getLocation(), Destructor, 9117 PDiag(diag::err_access_dtor_ivar) 9118 << Context.getBaseElementType(Field->getType())); 9119 } 9120 } 9121 } 9122 ObjCImplementation->setIvarInitializers(Context, 9123 AllToInit.data(), AllToInit.size()); 9124 } 9125} 9126 9127static 9128void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9129 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9130 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9131 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9132 Sema &S) { 9133 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9134 CE = Current.end(); 9135 if (Ctor->isInvalidDecl()) 9136 return; 9137 9138 const FunctionDecl *FNTarget = 0; 9139 CXXConstructorDecl *Target; 9140 9141 // We ignore the result here since if we don't have a body, Target will be 9142 // null below. 9143 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9144 Target 9145= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9146 9147 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9148 // Avoid dereferencing a null pointer here. 9149 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9150 9151 if (!Current.insert(Canonical)) 9152 return; 9153 9154 // We know that beyond here, we aren't chaining into a cycle. 9155 if (!Target || !Target->isDelegatingConstructor() || 9156 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9157 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9158 Valid.insert(*CI); 9159 Current.clear(); 9160 // We've hit a cycle. 9161 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9162 Current.count(TCanonical)) { 9163 // If we haven't diagnosed this cycle yet, do so now. 9164 if (!Invalid.count(TCanonical)) { 9165 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9166 diag::warn_delegating_ctor_cycle) 9167 << Ctor; 9168 9169 // Don't add a note for a function delegating directo to itself. 9170 if (TCanonical != Canonical) 9171 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9172 9173 CXXConstructorDecl *C = Target; 9174 while (C->getCanonicalDecl() != Canonical) { 9175 (void)C->getTargetConstructor()->hasBody(FNTarget); 9176 assert(FNTarget && "Ctor cycle through bodiless function"); 9177 9178 C 9179 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9180 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9181 } 9182 } 9183 9184 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9185 Invalid.insert(*CI); 9186 Current.clear(); 9187 } else { 9188 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9189 } 9190} 9191 9192 9193void Sema::CheckDelegatingCtorCycles() { 9194 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9195 9196 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9197 CE = Current.end(); 9198 9199 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9200 I = DelegatingCtorDecls.begin(), 9201 E = DelegatingCtorDecls.end(); 9202 I != E; ++I) { 9203 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9204 } 9205 9206 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9207 (*CI)->setInvalidDecl(); 9208} 9209