SemaDeclCXX.cpp revision 0ee33912f8ec3453856c8a32ed2c2e8007bed614
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // If this function has a basic noexcept, it doesn't affect the outcome. 133 if (EST == EST_BasicNoexcept) 134 return; 135 136 // If we have a throw-all spec at this point, ignore the function. 137 if (ComputedEST == EST_None) 138 return; 139 140 // If we're still at noexcept(true) and there's a nothrow() callee, 141 // change to that specification. 142 if (EST == EST_DynamicNone) { 143 if (ComputedEST == EST_BasicNoexcept) 144 ComputedEST = EST_DynamicNone; 145 return; 146 } 147 148 // Check out noexcept specs. 149 if (EST == EST_ComputedNoexcept) { 150 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 151 assert(NR != FunctionProtoType::NR_NoNoexcept && 152 "Must have noexcept result for EST_ComputedNoexcept."); 153 assert(NR != FunctionProtoType::NR_Dependent && 154 "Should not generate implicit declarations for dependent cases, " 155 "and don't know how to handle them anyway."); 156 157 // noexcept(false) -> no spec on the new function 158 if (NR == FunctionProtoType::NR_Throw) { 159 ClearExceptions(); 160 ComputedEST = EST_None; 161 } 162 // noexcept(true) won't change anything either. 163 return; 164 } 165 166 assert(EST == EST_Dynamic && "EST case not considered earlier."); 167 assert(ComputedEST != EST_None && 168 "Shouldn't collect exceptions when throw-all is guaranteed."); 169 ComputedEST = EST_Dynamic; 170 // Record the exceptions in this function's exception specification. 171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 172 EEnd = Proto->exception_end(); 173 E != EEnd; ++E) 174 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 175 Exceptions.push_back(*E); 176} 177 178bool 179Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 180 SourceLocation EqualLoc) { 181 if (RequireCompleteType(Param->getLocation(), Param->getType(), 182 diag::err_typecheck_decl_incomplete_type)) { 183 Param->setInvalidDecl(); 184 return true; 185 } 186 187 // C++ [dcl.fct.default]p5 188 // A default argument expression is implicitly converted (clause 189 // 4) to the parameter type. The default argument expression has 190 // the same semantic constraints as the initializer expression in 191 // a declaration of a variable of the parameter type, using the 192 // copy-initialization semantics (8.5). 193 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 194 Param); 195 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 196 EqualLoc); 197 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 198 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 199 MultiExprArg(*this, &Arg, 1)); 200 if (Result.isInvalid()) 201 return true; 202 Arg = Result.takeAs<Expr>(); 203 204 CheckImplicitConversions(Arg, EqualLoc); 205 Arg = MaybeCreateExprWithCleanups(Arg); 206 207 // Okay: add the default argument to the parameter 208 Param->setDefaultArg(Arg); 209 210 // We have already instantiated this parameter; provide each of the 211 // instantiations with the uninstantiated default argument. 212 UnparsedDefaultArgInstantiationsMap::iterator InstPos 213 = UnparsedDefaultArgInstantiations.find(Param); 214 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 215 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 216 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 217 218 // We're done tracking this parameter's instantiations. 219 UnparsedDefaultArgInstantiations.erase(InstPos); 220 } 221 222 return false; 223} 224 225/// ActOnParamDefaultArgument - Check whether the default argument 226/// provided for a function parameter is well-formed. If so, attach it 227/// to the parameter declaration. 228void 229Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 230 Expr *DefaultArg) { 231 if (!param || !DefaultArg) 232 return; 233 234 ParmVarDecl *Param = cast<ParmVarDecl>(param); 235 UnparsedDefaultArgLocs.erase(Param); 236 237 // Default arguments are only permitted in C++ 238 if (!getLangOptions().CPlusPlus) { 239 Diag(EqualLoc, diag::err_param_default_argument) 240 << DefaultArg->getSourceRange(); 241 Param->setInvalidDecl(); 242 return; 243 } 244 245 // Check for unexpanded parameter packs. 246 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 247 Param->setInvalidDecl(); 248 return; 249 } 250 251 // Check that the default argument is well-formed 252 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 253 if (DefaultArgChecker.Visit(DefaultArg)) { 254 Param->setInvalidDecl(); 255 return; 256 } 257 258 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 259} 260 261/// ActOnParamUnparsedDefaultArgument - We've seen a default 262/// argument for a function parameter, but we can't parse it yet 263/// because we're inside a class definition. Note that this default 264/// argument will be parsed later. 265void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 266 SourceLocation EqualLoc, 267 SourceLocation ArgLoc) { 268 if (!param) 269 return; 270 271 ParmVarDecl *Param = cast<ParmVarDecl>(param); 272 if (Param) 273 Param->setUnparsedDefaultArg(); 274 275 UnparsedDefaultArgLocs[Param] = ArgLoc; 276} 277 278/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 279/// the default argument for the parameter param failed. 280void Sema::ActOnParamDefaultArgumentError(Decl *param) { 281 if (!param) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 286 Param->setInvalidDecl(); 287 288 UnparsedDefaultArgLocs.erase(Param); 289} 290 291/// CheckExtraCXXDefaultArguments - Check for any extra default 292/// arguments in the declarator, which is not a function declaration 293/// or definition and therefore is not permitted to have default 294/// arguments. This routine should be invoked for every declarator 295/// that is not a function declaration or definition. 296void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 297 // C++ [dcl.fct.default]p3 298 // A default argument expression shall be specified only in the 299 // parameter-declaration-clause of a function declaration or in a 300 // template-parameter (14.1). It shall not be specified for a 301 // parameter pack. If it is specified in a 302 // parameter-declaration-clause, it shall not occur within a 303 // declarator or abstract-declarator of a parameter-declaration. 304 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 305 DeclaratorChunk &chunk = D.getTypeObject(i); 306 if (chunk.Kind == DeclaratorChunk::Function) { 307 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 308 ParmVarDecl *Param = 309 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 310 if (Param->hasUnparsedDefaultArg()) { 311 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 312 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 313 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 314 delete Toks; 315 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 316 } else if (Param->getDefaultArg()) { 317 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 318 << Param->getDefaultArg()->getSourceRange(); 319 Param->setDefaultArg(0); 320 } 321 } 322 } 323 } 324} 325 326// MergeCXXFunctionDecl - Merge two declarations of the same C++ 327// function, once we already know that they have the same 328// type. Subroutine of MergeFunctionDecl. Returns true if there was an 329// error, false otherwise. 330bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 331 bool Invalid = false; 332 333 // C++ [dcl.fct.default]p4: 334 // For non-template functions, default arguments can be added in 335 // later declarations of a function in the same 336 // scope. Declarations in different scopes have completely 337 // distinct sets of default arguments. That is, declarations in 338 // inner scopes do not acquire default arguments from 339 // declarations in outer scopes, and vice versa. In a given 340 // function declaration, all parameters subsequent to a 341 // parameter with a default argument shall have default 342 // arguments supplied in this or previous declarations. A 343 // default argument shall not be redefined by a later 344 // declaration (not even to the same value). 345 // 346 // C++ [dcl.fct.default]p6: 347 // Except for member functions of class templates, the default arguments 348 // in a member function definition that appears outside of the class 349 // definition are added to the set of default arguments provided by the 350 // member function declaration in the class definition. 351 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 352 ParmVarDecl *OldParam = Old->getParamDecl(p); 353 ParmVarDecl *NewParam = New->getParamDecl(p); 354 355 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 356 357 unsigned DiagDefaultParamID = 358 diag::err_param_default_argument_redefinition; 359 360 // MSVC accepts that default parameters be redefined for member functions 361 // of template class. The new default parameter's value is ignored. 362 Invalid = true; 363 if (getLangOptions().Microsoft) { 364 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 365 if (MD && MD->getParent()->getDescribedClassTemplate()) { 366 // Merge the old default argument into the new parameter. 367 NewParam->setHasInheritedDefaultArg(); 368 if (OldParam->hasUninstantiatedDefaultArg()) 369 NewParam->setUninstantiatedDefaultArg( 370 OldParam->getUninstantiatedDefaultArg()); 371 else 372 NewParam->setDefaultArg(OldParam->getInit()); 373 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 374 Invalid = false; 375 } 376 } 377 378 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 379 // hint here. Alternatively, we could walk the type-source information 380 // for NewParam to find the last source location in the type... but it 381 // isn't worth the effort right now. This is the kind of test case that 382 // is hard to get right: 383 // int f(int); 384 // void g(int (*fp)(int) = f); 385 // void g(int (*fp)(int) = &f); 386 Diag(NewParam->getLocation(), DiagDefaultParamID) 387 << NewParam->getDefaultArgRange(); 388 389 // Look for the function declaration where the default argument was 390 // actually written, which may be a declaration prior to Old. 391 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 392 Older; Older = Older->getPreviousDeclaration()) { 393 if (!Older->getParamDecl(p)->hasDefaultArg()) 394 break; 395 396 OldParam = Older->getParamDecl(p); 397 } 398 399 Diag(OldParam->getLocation(), diag::note_previous_definition) 400 << OldParam->getDefaultArgRange(); 401 } else if (OldParam->hasDefaultArg()) { 402 // Merge the old default argument into the new parameter. 403 // It's important to use getInit() here; getDefaultArg() 404 // strips off any top-level ExprWithCleanups. 405 NewParam->setHasInheritedDefaultArg(); 406 if (OldParam->hasUninstantiatedDefaultArg()) 407 NewParam->setUninstantiatedDefaultArg( 408 OldParam->getUninstantiatedDefaultArg()); 409 else 410 NewParam->setDefaultArg(OldParam->getInit()); 411 } else if (NewParam->hasDefaultArg()) { 412 if (New->getDescribedFunctionTemplate()) { 413 // Paragraph 4, quoted above, only applies to non-template functions. 414 Diag(NewParam->getLocation(), 415 diag::err_param_default_argument_template_redecl) 416 << NewParam->getDefaultArgRange(); 417 Diag(Old->getLocation(), diag::note_template_prev_declaration) 418 << false; 419 } else if (New->getTemplateSpecializationKind() 420 != TSK_ImplicitInstantiation && 421 New->getTemplateSpecializationKind() != TSK_Undeclared) { 422 // C++ [temp.expr.spec]p21: 423 // Default function arguments shall not be specified in a declaration 424 // or a definition for one of the following explicit specializations: 425 // - the explicit specialization of a function template; 426 // - the explicit specialization of a member function template; 427 // - the explicit specialization of a member function of a class 428 // template where the class template specialization to which the 429 // member function specialization belongs is implicitly 430 // instantiated. 431 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 432 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 433 << New->getDeclName() 434 << NewParam->getDefaultArgRange(); 435 } else if (New->getDeclContext()->isDependentContext()) { 436 // C++ [dcl.fct.default]p6 (DR217): 437 // Default arguments for a member function of a class template shall 438 // be specified on the initial declaration of the member function 439 // within the class template. 440 // 441 // Reading the tea leaves a bit in DR217 and its reference to DR205 442 // leads me to the conclusion that one cannot add default function 443 // arguments for an out-of-line definition of a member function of a 444 // dependent type. 445 int WhichKind = 2; 446 if (CXXRecordDecl *Record 447 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 448 if (Record->getDescribedClassTemplate()) 449 WhichKind = 0; 450 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 451 WhichKind = 1; 452 else 453 WhichKind = 2; 454 } 455 456 Diag(NewParam->getLocation(), 457 diag::err_param_default_argument_member_template_redecl) 458 << WhichKind 459 << NewParam->getDefaultArgRange(); 460 } 461 } 462 } 463 464 if (CheckEquivalentExceptionSpec(Old, New)) 465 Invalid = true; 466 467 return Invalid; 468} 469 470/// \brief Merge the exception specifications of two variable declarations. 471/// 472/// This is called when there's a redeclaration of a VarDecl. The function 473/// checks if the redeclaration might have an exception specification and 474/// validates compatibility and merges the specs if necessary. 475void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 476 // Shortcut if exceptions are disabled. 477 if (!getLangOptions().CXXExceptions) 478 return; 479 480 assert(Context.hasSameType(New->getType(), Old->getType()) && 481 "Should only be called if types are otherwise the same."); 482 483 QualType NewType = New->getType(); 484 QualType OldType = Old->getType(); 485 486 // We're only interested in pointers and references to functions, as well 487 // as pointers to member functions. 488 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 489 NewType = R->getPointeeType(); 490 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 491 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 492 NewType = P->getPointeeType(); 493 OldType = OldType->getAs<PointerType>()->getPointeeType(); 494 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 495 NewType = M->getPointeeType(); 496 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 497 } 498 499 if (!NewType->isFunctionProtoType()) 500 return; 501 502 // There's lots of special cases for functions. For function pointers, system 503 // libraries are hopefully not as broken so that we don't need these 504 // workarounds. 505 if (CheckEquivalentExceptionSpec( 506 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 507 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 508 New->setInvalidDecl(); 509 } 510} 511 512/// CheckCXXDefaultArguments - Verify that the default arguments for a 513/// function declaration are well-formed according to C++ 514/// [dcl.fct.default]. 515void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 516 unsigned NumParams = FD->getNumParams(); 517 unsigned p; 518 519 // Find first parameter with a default argument 520 for (p = 0; p < NumParams; ++p) { 521 ParmVarDecl *Param = FD->getParamDecl(p); 522 if (Param->hasDefaultArg()) 523 break; 524 } 525 526 // C++ [dcl.fct.default]p4: 527 // In a given function declaration, all parameters 528 // subsequent to a parameter with a default argument shall 529 // have default arguments supplied in this or previous 530 // declarations. A default argument shall not be redefined 531 // by a later declaration (not even to the same value). 532 unsigned LastMissingDefaultArg = 0; 533 for (; p < NumParams; ++p) { 534 ParmVarDecl *Param = FD->getParamDecl(p); 535 if (!Param->hasDefaultArg()) { 536 if (Param->isInvalidDecl()) 537 /* We already complained about this parameter. */; 538 else if (Param->getIdentifier()) 539 Diag(Param->getLocation(), 540 diag::err_param_default_argument_missing_name) 541 << Param->getIdentifier(); 542 else 543 Diag(Param->getLocation(), 544 diag::err_param_default_argument_missing); 545 546 LastMissingDefaultArg = p; 547 } 548 } 549 550 if (LastMissingDefaultArg > 0) { 551 // Some default arguments were missing. Clear out all of the 552 // default arguments up to (and including) the last missing 553 // default argument, so that we leave the function parameters 554 // in a semantically valid state. 555 for (p = 0; p <= LastMissingDefaultArg; ++p) { 556 ParmVarDecl *Param = FD->getParamDecl(p); 557 if (Param->hasDefaultArg()) { 558 Param->setDefaultArg(0); 559 } 560 } 561 } 562} 563 564/// isCurrentClassName - Determine whether the identifier II is the 565/// name of the class type currently being defined. In the case of 566/// nested classes, this will only return true if II is the name of 567/// the innermost class. 568bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 569 const CXXScopeSpec *SS) { 570 assert(getLangOptions().CPlusPlus && "No class names in C!"); 571 572 CXXRecordDecl *CurDecl; 573 if (SS && SS->isSet() && !SS->isInvalid()) { 574 DeclContext *DC = computeDeclContext(*SS, true); 575 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 576 } else 577 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 578 579 if (CurDecl && CurDecl->getIdentifier()) 580 return &II == CurDecl->getIdentifier(); 581 else 582 return false; 583} 584 585/// \brief Check the validity of a C++ base class specifier. 586/// 587/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 588/// and returns NULL otherwise. 589CXXBaseSpecifier * 590Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 591 SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeSourceInfo *TInfo, 594 SourceLocation EllipsisLoc) { 595 QualType BaseType = TInfo->getType(); 596 597 // C++ [class.union]p1: 598 // A union shall not have base classes. 599 if (Class->isUnion()) { 600 Diag(Class->getLocation(), diag::err_base_clause_on_union) 601 << SpecifierRange; 602 return 0; 603 } 604 605 if (EllipsisLoc.isValid() && 606 !TInfo->getType()->containsUnexpandedParameterPack()) { 607 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 608 << TInfo->getTypeLoc().getSourceRange(); 609 EllipsisLoc = SourceLocation(); 610 } 611 612 if (BaseType->isDependentType()) 613 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 614 Class->getTagKind() == TTK_Class, 615 Access, TInfo, EllipsisLoc); 616 617 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 618 619 // Base specifiers must be record types. 620 if (!BaseType->isRecordType()) { 621 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 622 return 0; 623 } 624 625 // C++ [class.union]p1: 626 // A union shall not be used as a base class. 627 if (BaseType->isUnionType()) { 628 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 629 return 0; 630 } 631 632 // C++ [class.derived]p2: 633 // The class-name in a base-specifier shall not be an incompletely 634 // defined class. 635 if (RequireCompleteType(BaseLoc, BaseType, 636 PDiag(diag::err_incomplete_base_class) 637 << SpecifierRange)) { 638 Class->setInvalidDecl(); 639 return 0; 640 } 641 642 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 643 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 644 assert(BaseDecl && "Record type has no declaration"); 645 BaseDecl = BaseDecl->getDefinition(); 646 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 647 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 648 assert(CXXBaseDecl && "Base type is not a C++ type"); 649 650 // C++ [class]p3: 651 // If a class is marked final and it appears as a base-type-specifier in 652 // base-clause, the program is ill-formed. 653 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 654 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 655 << CXXBaseDecl->getDeclName(); 656 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 657 << CXXBaseDecl->getDeclName(); 658 return 0; 659 } 660 661 if (BaseDecl->isInvalidDecl()) 662 Class->setInvalidDecl(); 663 664 // Create the base specifier. 665 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 666 Class->getTagKind() == TTK_Class, 667 Access, TInfo, EllipsisLoc); 668} 669 670/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 671/// one entry in the base class list of a class specifier, for 672/// example: 673/// class foo : public bar, virtual private baz { 674/// 'public bar' and 'virtual private baz' are each base-specifiers. 675BaseResult 676Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 677 bool Virtual, AccessSpecifier Access, 678 ParsedType basetype, SourceLocation BaseLoc, 679 SourceLocation EllipsisLoc) { 680 if (!classdecl) 681 return true; 682 683 AdjustDeclIfTemplate(classdecl); 684 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 685 if (!Class) 686 return true; 687 688 TypeSourceInfo *TInfo = 0; 689 GetTypeFromParser(basetype, &TInfo); 690 691 if (EllipsisLoc.isInvalid() && 692 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 693 UPPC_BaseType)) 694 return true; 695 696 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 697 Virtual, Access, TInfo, 698 EllipsisLoc)) 699 return BaseSpec; 700 701 return true; 702} 703 704/// \brief Performs the actual work of attaching the given base class 705/// specifiers to a C++ class. 706bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 707 unsigned NumBases) { 708 if (NumBases == 0) 709 return false; 710 711 // Used to keep track of which base types we have already seen, so 712 // that we can properly diagnose redundant direct base types. Note 713 // that the key is always the unqualified canonical type of the base 714 // class. 715 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 716 717 // Copy non-redundant base specifiers into permanent storage. 718 unsigned NumGoodBases = 0; 719 bool Invalid = false; 720 for (unsigned idx = 0; idx < NumBases; ++idx) { 721 QualType NewBaseType 722 = Context.getCanonicalType(Bases[idx]->getType()); 723 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 724 if (!Class->hasObjectMember()) { 725 if (const RecordType *FDTTy = 726 NewBaseType.getTypePtr()->getAs<RecordType>()) 727 if (FDTTy->getDecl()->hasObjectMember()) 728 Class->setHasObjectMember(true); 729 } 730 731 if (KnownBaseTypes[NewBaseType]) { 732 // C++ [class.mi]p3: 733 // A class shall not be specified as a direct base class of a 734 // derived class more than once. 735 Diag(Bases[idx]->getSourceRange().getBegin(), 736 diag::err_duplicate_base_class) 737 << KnownBaseTypes[NewBaseType]->getType() 738 << Bases[idx]->getSourceRange(); 739 740 // Delete the duplicate base class specifier; we're going to 741 // overwrite its pointer later. 742 Context.Deallocate(Bases[idx]); 743 744 Invalid = true; 745 } else { 746 // Okay, add this new base class. 747 KnownBaseTypes[NewBaseType] = Bases[idx]; 748 Bases[NumGoodBases++] = Bases[idx]; 749 } 750 } 751 752 // Attach the remaining base class specifiers to the derived class. 753 Class->setBases(Bases, NumGoodBases); 754 755 // Delete the remaining (good) base class specifiers, since their 756 // data has been copied into the CXXRecordDecl. 757 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 758 Context.Deallocate(Bases[idx]); 759 760 return Invalid; 761} 762 763/// ActOnBaseSpecifiers - Attach the given base specifiers to the 764/// class, after checking whether there are any duplicate base 765/// classes. 766void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 767 unsigned NumBases) { 768 if (!ClassDecl || !Bases || !NumBases) 769 return; 770 771 AdjustDeclIfTemplate(ClassDecl); 772 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 773 (CXXBaseSpecifier**)(Bases), NumBases); 774} 775 776static CXXRecordDecl *GetClassForType(QualType T) { 777 if (const RecordType *RT = T->getAs<RecordType>()) 778 return cast<CXXRecordDecl>(RT->getDecl()); 779 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 780 return ICT->getDecl(); 781 else 782 return 0; 783} 784 785/// \brief Determine whether the type \p Derived is a C++ class that is 786/// derived from the type \p Base. 787bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 788 if (!getLangOptions().CPlusPlus) 789 return false; 790 791 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 792 if (!DerivedRD) 793 return false; 794 795 CXXRecordDecl *BaseRD = GetClassForType(Base); 796 if (!BaseRD) 797 return false; 798 799 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 800 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 801} 802 803/// \brief Determine whether the type \p Derived is a C++ class that is 804/// derived from the type \p Base. 805bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 810 if (!DerivedRD) 811 return false; 812 813 CXXRecordDecl *BaseRD = GetClassForType(Base); 814 if (!BaseRD) 815 return false; 816 817 return DerivedRD->isDerivedFrom(BaseRD, Paths); 818} 819 820void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 821 CXXCastPath &BasePathArray) { 822 assert(BasePathArray.empty() && "Base path array must be empty!"); 823 assert(Paths.isRecordingPaths() && "Must record paths!"); 824 825 const CXXBasePath &Path = Paths.front(); 826 827 // We first go backward and check if we have a virtual base. 828 // FIXME: It would be better if CXXBasePath had the base specifier for 829 // the nearest virtual base. 830 unsigned Start = 0; 831 for (unsigned I = Path.size(); I != 0; --I) { 832 if (Path[I - 1].Base->isVirtual()) { 833 Start = I - 1; 834 break; 835 } 836 } 837 838 // Now add all bases. 839 for (unsigned I = Start, E = Path.size(); I != E; ++I) 840 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 841} 842 843/// \brief Determine whether the given base path includes a virtual 844/// base class. 845bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 846 for (CXXCastPath::const_iterator B = BasePath.begin(), 847 BEnd = BasePath.end(); 848 B != BEnd; ++B) 849 if ((*B)->isVirtual()) 850 return true; 851 852 return false; 853} 854 855/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 856/// conversion (where Derived and Base are class types) is 857/// well-formed, meaning that the conversion is unambiguous (and 858/// that all of the base classes are accessible). Returns true 859/// and emits a diagnostic if the code is ill-formed, returns false 860/// otherwise. Loc is the location where this routine should point to 861/// if there is an error, and Range is the source range to highlight 862/// if there is an error. 863bool 864Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 865 unsigned InaccessibleBaseID, 866 unsigned AmbigiousBaseConvID, 867 SourceLocation Loc, SourceRange Range, 868 DeclarationName Name, 869 CXXCastPath *BasePath) { 870 // First, determine whether the path from Derived to Base is 871 // ambiguous. This is slightly more expensive than checking whether 872 // the Derived to Base conversion exists, because here we need to 873 // explore multiple paths to determine if there is an ambiguity. 874 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 875 /*DetectVirtual=*/false); 876 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 877 assert(DerivationOkay && 878 "Can only be used with a derived-to-base conversion"); 879 (void)DerivationOkay; 880 881 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 882 if (InaccessibleBaseID) { 883 // Check that the base class can be accessed. 884 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 885 InaccessibleBaseID)) { 886 case AR_inaccessible: 887 return true; 888 case AR_accessible: 889 case AR_dependent: 890 case AR_delayed: 891 break; 892 } 893 } 894 895 // Build a base path if necessary. 896 if (BasePath) 897 BuildBasePathArray(Paths, *BasePath); 898 return false; 899 } 900 901 // We know that the derived-to-base conversion is ambiguous, and 902 // we're going to produce a diagnostic. Perform the derived-to-base 903 // search just one more time to compute all of the possible paths so 904 // that we can print them out. This is more expensive than any of 905 // the previous derived-to-base checks we've done, but at this point 906 // performance isn't as much of an issue. 907 Paths.clear(); 908 Paths.setRecordingPaths(true); 909 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 910 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 911 (void)StillOkay; 912 913 // Build up a textual representation of the ambiguous paths, e.g., 914 // D -> B -> A, that will be used to illustrate the ambiguous 915 // conversions in the diagnostic. We only print one of the paths 916 // to each base class subobject. 917 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 918 919 Diag(Loc, AmbigiousBaseConvID) 920 << Derived << Base << PathDisplayStr << Range << Name; 921 return true; 922} 923 924bool 925Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 926 SourceLocation Loc, SourceRange Range, 927 CXXCastPath *BasePath, 928 bool IgnoreAccess) { 929 return CheckDerivedToBaseConversion(Derived, Base, 930 IgnoreAccess ? 0 931 : diag::err_upcast_to_inaccessible_base, 932 diag::err_ambiguous_derived_to_base_conv, 933 Loc, Range, DeclarationName(), 934 BasePath); 935} 936 937 938/// @brief Builds a string representing ambiguous paths from a 939/// specific derived class to different subobjects of the same base 940/// class. 941/// 942/// This function builds a string that can be used in error messages 943/// to show the different paths that one can take through the 944/// inheritance hierarchy to go from the derived class to different 945/// subobjects of a base class. The result looks something like this: 946/// @code 947/// struct D -> struct B -> struct A 948/// struct D -> struct C -> struct A 949/// @endcode 950std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 951 std::string PathDisplayStr; 952 std::set<unsigned> DisplayedPaths; 953 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 954 Path != Paths.end(); ++Path) { 955 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 956 // We haven't displayed a path to this particular base 957 // class subobject yet. 958 PathDisplayStr += "\n "; 959 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 960 for (CXXBasePath::const_iterator Element = Path->begin(); 961 Element != Path->end(); ++Element) 962 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 963 } 964 } 965 966 return PathDisplayStr; 967} 968 969//===----------------------------------------------------------------------===// 970// C++ class member Handling 971//===----------------------------------------------------------------------===// 972 973/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 974Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 975 SourceLocation ASLoc, 976 SourceLocation ColonLoc) { 977 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 978 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 979 ASLoc, ColonLoc); 980 CurContext->addHiddenDecl(ASDecl); 981 return ASDecl; 982} 983 984/// CheckOverrideControl - Check C++0x override control semantics. 985void Sema::CheckOverrideControl(const Decl *D) { 986 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 987 if (!MD || !MD->isVirtual()) 988 return; 989 990 if (MD->isDependentContext()) 991 return; 992 993 // C++0x [class.virtual]p3: 994 // If a virtual function is marked with the virt-specifier override and does 995 // not override a member function of a base class, 996 // the program is ill-formed. 997 bool HasOverriddenMethods = 998 MD->begin_overridden_methods() != MD->end_overridden_methods(); 999 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1000 Diag(MD->getLocation(), 1001 diag::err_function_marked_override_not_overriding) 1002 << MD->getDeclName(); 1003 return; 1004 } 1005} 1006 1007/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1008/// function overrides a virtual member function marked 'final', according to 1009/// C++0x [class.virtual]p3. 1010bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1011 const CXXMethodDecl *Old) { 1012 if (!Old->hasAttr<FinalAttr>()) 1013 return false; 1014 1015 Diag(New->getLocation(), diag::err_final_function_overridden) 1016 << New->getDeclName(); 1017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1018 return true; 1019} 1020 1021/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1022/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1023/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1024/// any. 1025Decl * 1026Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1027 MultiTemplateParamsArg TemplateParameterLists, 1028 ExprTy *BW, const VirtSpecifiers &VS, 1029 ExprTy *InitExpr, bool IsDefinition) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (SS.isSet() && !SS.isInvalid()) { 1095 // The user provided a superfluous scope specifier inside a class 1096 // definition: 1097 // 1098 // class X { 1099 // int X::member; 1100 // }; 1101 DeclContext *DC = 0; 1102 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1103 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1104 << Name << FixItHint::CreateRemoval(SS.getRange()); 1105 else 1106 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1107 << Name << SS.getRange(); 1108 1109 SS.clear(); 1110 } 1111 1112 // FIXME: Check for template parameters! 1113 // FIXME: Check that the name is an identifier! 1114 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1115 AS); 1116 assert(Member && "HandleField never returns null"); 1117 } else { 1118 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1119 if (!Member) { 1120 return 0; 1121 } 1122 1123 // Non-instance-fields can't have a bitfield. 1124 if (BitWidth) { 1125 if (Member->isInvalidDecl()) { 1126 // don't emit another diagnostic. 1127 } else if (isa<VarDecl>(Member)) { 1128 // C++ 9.6p3: A bit-field shall not be a static member. 1129 // "static member 'A' cannot be a bit-field" 1130 Diag(Loc, diag::err_static_not_bitfield) 1131 << Name << BitWidth->getSourceRange(); 1132 } else if (isa<TypedefDecl>(Member)) { 1133 // "typedef member 'x' cannot be a bit-field" 1134 Diag(Loc, diag::err_typedef_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else { 1137 // A function typedef ("typedef int f(); f a;"). 1138 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1139 Diag(Loc, diag::err_not_integral_type_bitfield) 1140 << Name << cast<ValueDecl>(Member)->getType() 1141 << BitWidth->getSourceRange(); 1142 } 1143 1144 BitWidth = 0; 1145 Member->setInvalidDecl(); 1146 } 1147 1148 Member->setAccess(AS); 1149 1150 // If we have declared a member function template, set the access of the 1151 // templated declaration as well. 1152 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1153 FunTmpl->getTemplatedDecl()->setAccess(AS); 1154 } 1155 1156 if (VS.isOverrideSpecified()) { 1157 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1158 if (!MD || !MD->isVirtual()) { 1159 Diag(Member->getLocStart(), 1160 diag::override_keyword_only_allowed_on_virtual_member_functions) 1161 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1162 } else 1163 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1164 } 1165 if (VS.isFinalSpecified()) { 1166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1167 if (!MD || !MD->isVirtual()) { 1168 Diag(Member->getLocStart(), 1169 diag::override_keyword_only_allowed_on_virtual_member_functions) 1170 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1171 } else 1172 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1173 } 1174 1175 if (VS.getLastLocation().isValid()) { 1176 // Update the end location of a method that has a virt-specifiers. 1177 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1178 MD->setRangeEnd(VS.getLastLocation()); 1179 } 1180 1181 CheckOverrideControl(Member); 1182 1183 assert((Name || isInstField) && "No identifier for non-field ?"); 1184 1185 if (Init) 1186 AddInitializerToDecl(Member, Init, false, 1187 DS.getTypeSpecType() == DeclSpec::TST_auto); 1188 1189 FinalizeDeclaration(Member); 1190 1191 if (isInstField) 1192 FieldCollector->Add(cast<FieldDecl>(Member)); 1193 return Member; 1194} 1195 1196/// \brief Find the direct and/or virtual base specifiers that 1197/// correspond to the given base type, for use in base initialization 1198/// within a constructor. 1199static bool FindBaseInitializer(Sema &SemaRef, 1200 CXXRecordDecl *ClassDecl, 1201 QualType BaseType, 1202 const CXXBaseSpecifier *&DirectBaseSpec, 1203 const CXXBaseSpecifier *&VirtualBaseSpec) { 1204 // First, check for a direct base class. 1205 DirectBaseSpec = 0; 1206 for (CXXRecordDecl::base_class_const_iterator Base 1207 = ClassDecl->bases_begin(); 1208 Base != ClassDecl->bases_end(); ++Base) { 1209 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1210 // We found a direct base of this type. That's what we're 1211 // initializing. 1212 DirectBaseSpec = &*Base; 1213 break; 1214 } 1215 } 1216 1217 // Check for a virtual base class. 1218 // FIXME: We might be able to short-circuit this if we know in advance that 1219 // there are no virtual bases. 1220 VirtualBaseSpec = 0; 1221 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1222 // We haven't found a base yet; search the class hierarchy for a 1223 // virtual base class. 1224 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1225 /*DetectVirtual=*/false); 1226 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1227 BaseType, Paths)) { 1228 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1229 Path != Paths.end(); ++Path) { 1230 if (Path->back().Base->isVirtual()) { 1231 VirtualBaseSpec = Path->back().Base; 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 1238 return DirectBaseSpec || VirtualBaseSpec; 1239} 1240 1241/// ActOnMemInitializer - Handle a C++ member initializer. 1242MemInitResult 1243Sema::ActOnMemInitializer(Decl *ConstructorD, 1244 Scope *S, 1245 CXXScopeSpec &SS, 1246 IdentifierInfo *MemberOrBase, 1247 ParsedType TemplateTypeTy, 1248 SourceLocation IdLoc, 1249 SourceLocation LParenLoc, 1250 ExprTy **Args, unsigned NumArgs, 1251 SourceLocation RParenLoc, 1252 SourceLocation EllipsisLoc) { 1253 if (!ConstructorD) 1254 return true; 1255 1256 AdjustDeclIfTemplate(ConstructorD); 1257 1258 CXXConstructorDecl *Constructor 1259 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1260 if (!Constructor) { 1261 // The user wrote a constructor initializer on a function that is 1262 // not a C++ constructor. Ignore the error for now, because we may 1263 // have more member initializers coming; we'll diagnose it just 1264 // once in ActOnMemInitializers. 1265 return true; 1266 } 1267 1268 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1269 1270 // C++ [class.base.init]p2: 1271 // Names in a mem-initializer-id are looked up in the scope of the 1272 // constructor's class and, if not found in that scope, are looked 1273 // up in the scope containing the constructor's definition. 1274 // [Note: if the constructor's class contains a member with the 1275 // same name as a direct or virtual base class of the class, a 1276 // mem-initializer-id naming the member or base class and composed 1277 // of a single identifier refers to the class member. A 1278 // mem-initializer-id for the hidden base class may be specified 1279 // using a qualified name. ] 1280 if (!SS.getScopeRep() && !TemplateTypeTy) { 1281 // Look for a member, first. 1282 FieldDecl *Member = 0; 1283 DeclContext::lookup_result Result 1284 = ClassDecl->lookup(MemberOrBase); 1285 if (Result.first != Result.second) { 1286 Member = dyn_cast<FieldDecl>(*Result.first); 1287 1288 if (Member) { 1289 if (EllipsisLoc.isValid()) 1290 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1291 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1292 1293 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1294 LParenLoc, RParenLoc); 1295 } 1296 1297 // Handle anonymous union case. 1298 if (IndirectFieldDecl* IndirectField 1299 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1300 if (EllipsisLoc.isValid()) 1301 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1302 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1303 1304 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1305 NumArgs, IdLoc, 1306 LParenLoc, RParenLoc); 1307 } 1308 } 1309 } 1310 // It didn't name a member, so see if it names a class. 1311 QualType BaseType; 1312 TypeSourceInfo *TInfo = 0; 1313 1314 if (TemplateTypeTy) { 1315 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1316 } else { 1317 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1318 LookupParsedName(R, S, &SS); 1319 1320 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1321 if (!TyD) { 1322 if (R.isAmbiguous()) return true; 1323 1324 // We don't want access-control diagnostics here. 1325 R.suppressDiagnostics(); 1326 1327 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1328 bool NotUnknownSpecialization = false; 1329 DeclContext *DC = computeDeclContext(SS, false); 1330 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1331 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1332 1333 if (!NotUnknownSpecialization) { 1334 // When the scope specifier can refer to a member of an unknown 1335 // specialization, we take it as a type name. 1336 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1337 SS.getWithLocInContext(Context), 1338 *MemberOrBase, IdLoc); 1339 if (BaseType.isNull()) 1340 return true; 1341 1342 R.clear(); 1343 R.setLookupName(MemberOrBase); 1344 } 1345 } 1346 1347 // If no results were found, try to correct typos. 1348 if (R.empty() && BaseType.isNull() && 1349 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1350 R.isSingleResult()) { 1351 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1352 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1353 // We have found a non-static data member with a similar 1354 // name to what was typed; complain and initialize that 1355 // member. 1356 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1357 << MemberOrBase << true << R.getLookupName() 1358 << FixItHint::CreateReplacement(R.getNameLoc(), 1359 R.getLookupName().getAsString()); 1360 Diag(Member->getLocation(), diag::note_previous_decl) 1361 << Member->getDeclName(); 1362 1363 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1364 LParenLoc, RParenLoc); 1365 } 1366 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1367 const CXXBaseSpecifier *DirectBaseSpec; 1368 const CXXBaseSpecifier *VirtualBaseSpec; 1369 if (FindBaseInitializer(*this, ClassDecl, 1370 Context.getTypeDeclType(Type), 1371 DirectBaseSpec, VirtualBaseSpec)) { 1372 // We have found a direct or virtual base class with a 1373 // similar name to what was typed; complain and initialize 1374 // that base class. 1375 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1376 << MemberOrBase << false << R.getLookupName() 1377 << FixItHint::CreateReplacement(R.getNameLoc(), 1378 R.getLookupName().getAsString()); 1379 1380 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1381 : VirtualBaseSpec; 1382 Diag(BaseSpec->getSourceRange().getBegin(), 1383 diag::note_base_class_specified_here) 1384 << BaseSpec->getType() 1385 << BaseSpec->getSourceRange(); 1386 1387 TyD = Type; 1388 } 1389 } 1390 } 1391 1392 if (!TyD && BaseType.isNull()) { 1393 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1394 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1395 return true; 1396 } 1397 } 1398 1399 if (BaseType.isNull()) { 1400 BaseType = Context.getTypeDeclType(TyD); 1401 if (SS.isSet()) { 1402 NestedNameSpecifier *Qualifier = 1403 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1404 1405 // FIXME: preserve source range information 1406 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1407 } 1408 } 1409 } 1410 1411 if (!TInfo) 1412 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1413 1414 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1415 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1416} 1417 1418/// Checks an initializer expression for use of uninitialized fields, such as 1419/// containing the field that is being initialized. Returns true if there is an 1420/// uninitialized field was used an updates the SourceLocation parameter; false 1421/// otherwise. 1422static bool InitExprContainsUninitializedFields(const Stmt *S, 1423 const ValueDecl *LhsField, 1424 SourceLocation *L) { 1425 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1426 1427 if (isa<CallExpr>(S)) { 1428 // Do not descend into function calls or constructors, as the use 1429 // of an uninitialized field may be valid. One would have to inspect 1430 // the contents of the function/ctor to determine if it is safe or not. 1431 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1432 // may be safe, depending on what the function/ctor does. 1433 return false; 1434 } 1435 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1436 const NamedDecl *RhsField = ME->getMemberDecl(); 1437 1438 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1439 // The member expression points to a static data member. 1440 assert(VD->isStaticDataMember() && 1441 "Member points to non-static data member!"); 1442 (void)VD; 1443 return false; 1444 } 1445 1446 if (isa<EnumConstantDecl>(RhsField)) { 1447 // The member expression points to an enum. 1448 return false; 1449 } 1450 1451 if (RhsField == LhsField) { 1452 // Initializing a field with itself. Throw a warning. 1453 // But wait; there are exceptions! 1454 // Exception #1: The field may not belong to this record. 1455 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1456 const Expr *base = ME->getBase(); 1457 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1458 // Even though the field matches, it does not belong to this record. 1459 return false; 1460 } 1461 // None of the exceptions triggered; return true to indicate an 1462 // uninitialized field was used. 1463 *L = ME->getMemberLoc(); 1464 return true; 1465 } 1466 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1467 // sizeof/alignof doesn't reference contents, do not warn. 1468 return false; 1469 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1470 // address-of doesn't reference contents (the pointer may be dereferenced 1471 // in the same expression but it would be rare; and weird). 1472 if (UOE->getOpcode() == UO_AddrOf) 1473 return false; 1474 } 1475 for (Stmt::const_child_range it = S->children(); it; ++it) { 1476 if (!*it) { 1477 // An expression such as 'member(arg ?: "")' may trigger this. 1478 continue; 1479 } 1480 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1481 return true; 1482 } 1483 return false; 1484} 1485 1486MemInitResult 1487Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1488 unsigned NumArgs, SourceLocation IdLoc, 1489 SourceLocation LParenLoc, 1490 SourceLocation RParenLoc) { 1491 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1492 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1493 assert((DirectMember || IndirectMember) && 1494 "Member must be a FieldDecl or IndirectFieldDecl"); 1495 1496 if (Member->isInvalidDecl()) 1497 return true; 1498 1499 // Diagnose value-uses of fields to initialize themselves, e.g. 1500 // foo(foo) 1501 // where foo is not also a parameter to the constructor. 1502 // TODO: implement -Wuninitialized and fold this into that framework. 1503 for (unsigned i = 0; i < NumArgs; ++i) { 1504 SourceLocation L; 1505 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1506 // FIXME: Return true in the case when other fields are used before being 1507 // uninitialized. For example, let this field be the i'th field. When 1508 // initializing the i'th field, throw a warning if any of the >= i'th 1509 // fields are used, as they are not yet initialized. 1510 // Right now we are only handling the case where the i'th field uses 1511 // itself in its initializer. 1512 Diag(L, diag::warn_field_is_uninit); 1513 } 1514 } 1515 1516 bool HasDependentArg = false; 1517 for (unsigned i = 0; i < NumArgs; i++) 1518 HasDependentArg |= Args[i]->isTypeDependent(); 1519 1520 Expr *Init; 1521 if (Member->getType()->isDependentType() || HasDependentArg) { 1522 // Can't check initialization for a member of dependent type or when 1523 // any of the arguments are type-dependent expressions. 1524 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1525 RParenLoc); 1526 1527 // Erase any temporaries within this evaluation context; we're not 1528 // going to track them in the AST, since we'll be rebuilding the 1529 // ASTs during template instantiation. 1530 ExprTemporaries.erase( 1531 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1532 ExprTemporaries.end()); 1533 } else { 1534 // Initialize the member. 1535 InitializedEntity MemberEntity = 1536 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1537 : InitializedEntity::InitializeMember(IndirectMember, 0); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1542 1543 ExprResult MemberInit = 1544 InitSeq.Perform(*this, MemberEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (MemberInit.isInvalid()) 1547 return true; 1548 1549 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1550 1551 // C++0x [class.base.init]p7: 1552 // The initialization of each base and member constitutes a 1553 // full-expression. 1554 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 // If we are in a dependent context, template instantiation will 1559 // perform this type-checking again. Just save the arguments that we 1560 // received in a ParenListExpr. 1561 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1562 // of the information that we have about the member 1563 // initializer. However, deconstructing the ASTs is a dicey process, 1564 // and this approach is far more likely to get the corner cases right. 1565 if (CurContext->isDependentContext()) 1566 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1567 RParenLoc); 1568 else 1569 Init = MemberInit.get(); 1570 } 1571 1572 if (DirectMember) { 1573 return new (Context) CXXCtorInitializer(Context, DirectMember, 1574 IdLoc, LParenLoc, Init, 1575 RParenLoc); 1576 } else { 1577 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1578 IdLoc, LParenLoc, Init, 1579 RParenLoc); 1580 } 1581} 1582 1583MemInitResult 1584Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation NameLoc, 1587 SourceLocation LParenLoc, 1588 SourceLocation RParenLoc, 1589 CXXRecordDecl *ClassDecl) { 1590 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1591 if (!LangOpts.CPlusPlus0x) 1592 return Diag(Loc, diag::err_delegation_0x_only) 1593 << TInfo->getTypeLoc().getLocalSourceRange(); 1594 1595 // Initialize the object. 1596 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1597 QualType(ClassDecl->getTypeForDecl(), 0)); 1598 InitializationKind Kind = 1599 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1600 1601 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1602 1603 ExprResult DelegationInit = 1604 InitSeq.Perform(*this, DelegationEntity, Kind, 1605 MultiExprArg(*this, Args, NumArgs), 0); 1606 if (DelegationInit.isInvalid()) 1607 return true; 1608 1609 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1610 CXXConstructorDecl *Constructor 1611 = ConExpr->getConstructor(); 1612 assert(Constructor && "Delegating constructor with no target?"); 1613 1614 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1615 1616 // C++0x [class.base.init]p7: 1617 // The initialization of each base and member constitutes a 1618 // full-expression. 1619 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1620 if (DelegationInit.isInvalid()) 1621 return true; 1622 1623 // If we are in a dependent context, template instantiation will 1624 // perform this type-checking again. Just save the arguments that we 1625 // received in a ParenListExpr. 1626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1627 // of the information that we have about the base 1628 // initializer. However, deconstructing the ASTs is a dicey process, 1629 // and this approach is far more likely to get the corner cases right. 1630 if (CurContext->isDependentContext()) { 1631 ExprResult Init 1632 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1633 NumArgs, RParenLoc)); 1634 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1635 Constructor, Init.takeAs<Expr>(), 1636 RParenLoc); 1637 } 1638 1639 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1640 DelegationInit.takeAs<Expr>(), 1641 RParenLoc); 1642} 1643 1644MemInitResult 1645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1646 Expr **Args, unsigned NumArgs, 1647 SourceLocation LParenLoc, SourceLocation RParenLoc, 1648 CXXRecordDecl *ClassDecl, 1649 SourceLocation EllipsisLoc) { 1650 bool HasDependentArg = false; 1651 for (unsigned i = 0; i < NumArgs; i++) 1652 HasDependentArg |= Args[i]->isTypeDependent(); 1653 1654 SourceLocation BaseLoc 1655 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1656 1657 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1658 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1659 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1660 1661 // C++ [class.base.init]p2: 1662 // [...] Unless the mem-initializer-id names a nonstatic data 1663 // member of the constructor's class or a direct or virtual base 1664 // of that class, the mem-initializer is ill-formed. A 1665 // mem-initializer-list can initialize a base class using any 1666 // name that denotes that base class type. 1667 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1668 1669 if (EllipsisLoc.isValid()) { 1670 // This is a pack expansion. 1671 if (!BaseType->containsUnexpandedParameterPack()) { 1672 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1673 << SourceRange(BaseLoc, RParenLoc); 1674 1675 EllipsisLoc = SourceLocation(); 1676 } 1677 } else { 1678 // Check for any unexpanded parameter packs. 1679 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1680 return true; 1681 1682 for (unsigned I = 0; I != NumArgs; ++I) 1683 if (DiagnoseUnexpandedParameterPack(Args[I])) 1684 return true; 1685 } 1686 1687 // Check for direct and virtual base classes. 1688 const CXXBaseSpecifier *DirectBaseSpec = 0; 1689 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1690 if (!Dependent) { 1691 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1692 BaseType)) 1693 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1694 LParenLoc, RParenLoc, ClassDecl); 1695 1696 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1697 VirtualBaseSpec); 1698 1699 // C++ [base.class.init]p2: 1700 // Unless the mem-initializer-id names a nonstatic data member of the 1701 // constructor's class or a direct or virtual base of that class, the 1702 // mem-initializer is ill-formed. 1703 if (!DirectBaseSpec && !VirtualBaseSpec) { 1704 // If the class has any dependent bases, then it's possible that 1705 // one of those types will resolve to the same type as 1706 // BaseType. Therefore, just treat this as a dependent base 1707 // class initialization. FIXME: Should we try to check the 1708 // initialization anyway? It seems odd. 1709 if (ClassDecl->hasAnyDependentBases()) 1710 Dependent = true; 1711 else 1712 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1713 << BaseType << Context.getTypeDeclType(ClassDecl) 1714 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1715 } 1716 } 1717 1718 if (Dependent) { 1719 // Can't check initialization for a base of dependent type or when 1720 // any of the arguments are type-dependent expressions. 1721 ExprResult BaseInit 1722 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1723 RParenLoc)); 1724 1725 // Erase any temporaries within this evaluation context; we're not 1726 // going to track them in the AST, since we'll be rebuilding the 1727 // ASTs during template instantiation. 1728 ExprTemporaries.erase( 1729 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1730 ExprTemporaries.end()); 1731 1732 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1733 /*IsVirtual=*/false, 1734 LParenLoc, 1735 BaseInit.takeAs<Expr>(), 1736 RParenLoc, 1737 EllipsisLoc); 1738 } 1739 1740 // C++ [base.class.init]p2: 1741 // If a mem-initializer-id is ambiguous because it designates both 1742 // a direct non-virtual base class and an inherited virtual base 1743 // class, the mem-initializer is ill-formed. 1744 if (DirectBaseSpec && VirtualBaseSpec) 1745 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1746 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1747 1748 CXXBaseSpecifier *BaseSpec 1749 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1750 if (!BaseSpec) 1751 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1752 1753 // Initialize the base. 1754 InitializedEntity BaseEntity = 1755 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1756 InitializationKind Kind = 1757 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1758 1759 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1760 1761 ExprResult BaseInit = 1762 InitSeq.Perform(*this, BaseEntity, Kind, 1763 MultiExprArg(*this, Args, NumArgs), 0); 1764 if (BaseInit.isInvalid()) 1765 return true; 1766 1767 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1768 1769 // C++0x [class.base.init]p7: 1770 // The initialization of each base and member constitutes a 1771 // full-expression. 1772 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 // If we are in a dependent context, template instantiation will 1777 // perform this type-checking again. Just save the arguments that we 1778 // received in a ParenListExpr. 1779 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1780 // of the information that we have about the base 1781 // initializer. However, deconstructing the ASTs is a dicey process, 1782 // and this approach is far more likely to get the corner cases right. 1783 if (CurContext->isDependentContext()) { 1784 ExprResult Init 1785 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1786 RParenLoc)); 1787 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1788 BaseSpec->isVirtual(), 1789 LParenLoc, 1790 Init.takeAs<Expr>(), 1791 RParenLoc, 1792 EllipsisLoc); 1793 } 1794 1795 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1796 BaseSpec->isVirtual(), 1797 LParenLoc, 1798 BaseInit.takeAs<Expr>(), 1799 RParenLoc, 1800 EllipsisLoc); 1801} 1802 1803/// ImplicitInitializerKind - How an implicit base or member initializer should 1804/// initialize its base or member. 1805enum ImplicitInitializerKind { 1806 IIK_Default, 1807 IIK_Copy, 1808 IIK_Move 1809}; 1810 1811static bool 1812BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1813 ImplicitInitializerKind ImplicitInitKind, 1814 CXXBaseSpecifier *BaseSpec, 1815 bool IsInheritedVirtualBase, 1816 CXXCtorInitializer *&CXXBaseInit) { 1817 InitializedEntity InitEntity 1818 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1819 IsInheritedVirtualBase); 1820 1821 ExprResult BaseInit; 1822 1823 switch (ImplicitInitKind) { 1824 case IIK_Default: { 1825 InitializationKind InitKind 1826 = InitializationKind::CreateDefault(Constructor->getLocation()); 1827 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1828 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1829 MultiExprArg(SemaRef, 0, 0)); 1830 break; 1831 } 1832 1833 case IIK_Copy: { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *CopyCtorArg = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Constructor->getLocation(), ParamType, 1840 VK_LValue, 0); 1841 1842 // Cast to the base class to avoid ambiguities. 1843 QualType ArgTy = 1844 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1845 ParamType.getQualifiers()); 1846 1847 CXXCastPath BasePath; 1848 BasePath.push_back(BaseSpec); 1849 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1850 CK_UncheckedDerivedToBase, 1851 VK_LValue, &BasePath).take(); 1852 1853 InitializationKind InitKind 1854 = InitializationKind::CreateDirect(Constructor->getLocation(), 1855 SourceLocation(), SourceLocation()); 1856 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1857 &CopyCtorArg, 1); 1858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1859 MultiExprArg(&CopyCtorArg, 1)); 1860 break; 1861 } 1862 1863 case IIK_Move: 1864 assert(false && "Unhandled initializer kind!"); 1865 } 1866 1867 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 CXXBaseInit = 1872 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1873 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1874 SourceLocation()), 1875 BaseSpec->isVirtual(), 1876 SourceLocation(), 1877 BaseInit.takeAs<Expr>(), 1878 SourceLocation(), 1879 SourceLocation()); 1880 1881 return false; 1882} 1883 1884static bool 1885BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 FieldDecl *Field, 1888 CXXCtorInitializer *&CXXMemberInit) { 1889 if (Field->isInvalidDecl()) 1890 return true; 1891 1892 SourceLocation Loc = Constructor->getLocation(); 1893 1894 if (ImplicitInitKind == IIK_Copy) { 1895 ParmVarDecl *Param = Constructor->getParamDecl(0); 1896 QualType ParamType = Param->getType().getNonReferenceType(); 1897 1898 Expr *MemberExprBase = 1899 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1900 Loc, ParamType, VK_LValue, 0); 1901 1902 // Build a reference to this field within the parameter. 1903 CXXScopeSpec SS; 1904 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1905 Sema::LookupMemberName); 1906 MemberLookup.addDecl(Field, AS_public); 1907 MemberLookup.resolveKind(); 1908 ExprResult CopyCtorArg 1909 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1910 ParamType, Loc, 1911 /*IsArrow=*/false, 1912 SS, 1913 /*FirstQualifierInScope=*/0, 1914 MemberLookup, 1915 /*TemplateArgs=*/0); 1916 if (CopyCtorArg.isInvalid()) 1917 return true; 1918 1919 // When the field we are copying is an array, create index variables for 1920 // each dimension of the array. We use these index variables to subscript 1921 // the source array, and other clients (e.g., CodeGen) will perform the 1922 // necessary iteration with these index variables. 1923 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1924 QualType BaseType = Field->getType(); 1925 QualType SizeType = SemaRef.Context.getSizeType(); 1926 while (const ConstantArrayType *Array 1927 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1928 // Create the iteration variable for this array index. 1929 IdentifierInfo *IterationVarName = 0; 1930 { 1931 llvm::SmallString<8> Str; 1932 llvm::raw_svector_ostream OS(Str); 1933 OS << "__i" << IndexVariables.size(); 1934 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1935 } 1936 VarDecl *IterationVar 1937 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1938 IterationVarName, SizeType, 1939 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1940 SC_None, SC_None); 1941 IndexVariables.push_back(IterationVar); 1942 1943 // Create a reference to the iteration variable. 1944 ExprResult IterationVarRef 1945 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1946 assert(!IterationVarRef.isInvalid() && 1947 "Reference to invented variable cannot fail!"); 1948 1949 // Subscript the array with this iteration variable. 1950 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1951 Loc, 1952 IterationVarRef.take(), 1953 Loc); 1954 if (CopyCtorArg.isInvalid()) 1955 return true; 1956 1957 BaseType = Array->getElementType(); 1958 } 1959 1960 // Construct the entity that we will be initializing. For an array, this 1961 // will be first element in the array, which may require several levels 1962 // of array-subscript entities. 1963 llvm::SmallVector<InitializedEntity, 4> Entities; 1964 Entities.reserve(1 + IndexVariables.size()); 1965 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1966 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1967 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1968 0, 1969 Entities.back())); 1970 1971 // Direct-initialize to use the copy constructor. 1972 InitializationKind InitKind = 1973 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1974 1975 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1976 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1977 &CopyCtorArgE, 1); 1978 1979 ExprResult MemberInit 1980 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1981 MultiExprArg(&CopyCtorArgE, 1)); 1982 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1983 if (MemberInit.isInvalid()) 1984 return true; 1985 1986 CXXMemberInit 1987 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1988 MemberInit.takeAs<Expr>(), Loc, 1989 IndexVariables.data(), 1990 IndexVariables.size()); 1991 return false; 1992 } 1993 1994 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1995 1996 QualType FieldBaseElementType = 1997 SemaRef.Context.getBaseElementType(Field->getType()); 1998 1999 if (FieldBaseElementType->isRecordType()) { 2000 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2001 InitializationKind InitKind = 2002 InitializationKind::CreateDefault(Loc); 2003 2004 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2005 ExprResult MemberInit = 2006 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2007 2008 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2009 if (MemberInit.isInvalid()) 2010 return true; 2011 2012 CXXMemberInit = 2013 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2014 Field, Loc, Loc, 2015 MemberInit.get(), 2016 Loc); 2017 return false; 2018 } 2019 2020 if (!Field->getParent()->isUnion()) { 2021 if (FieldBaseElementType->isReferenceType()) { 2022 SemaRef.Diag(Constructor->getLocation(), 2023 diag::err_uninitialized_member_in_ctor) 2024 << (int)Constructor->isImplicit() 2025 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2026 << 0 << Field->getDeclName(); 2027 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2028 return true; 2029 } 2030 2031 if (FieldBaseElementType.isConstQualified()) { 2032 SemaRef.Diag(Constructor->getLocation(), 2033 diag::err_uninitialized_member_in_ctor) 2034 << (int)Constructor->isImplicit() 2035 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2036 << 1 << Field->getDeclName(); 2037 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2038 return true; 2039 } 2040 } 2041 2042 // Nothing to initialize. 2043 CXXMemberInit = 0; 2044 return false; 2045} 2046 2047namespace { 2048struct BaseAndFieldInfo { 2049 Sema &S; 2050 CXXConstructorDecl *Ctor; 2051 bool AnyErrorsInInits; 2052 ImplicitInitializerKind IIK; 2053 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2054 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2055 2056 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2057 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2058 // FIXME: Handle implicit move constructors. 2059 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2060 IIK = IIK_Copy; 2061 else 2062 IIK = IIK_Default; 2063 } 2064}; 2065} 2066 2067static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2068 FieldDecl *Top, FieldDecl *Field) { 2069 2070 // Overwhelmingly common case: we have a direct initializer for this field. 2071 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2072 Info.AllToInit.push_back(Init); 2073 return false; 2074 } 2075 2076 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2077 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2078 assert(FieldClassType && "anonymous struct/union without record type"); 2079 CXXRecordDecl *FieldClassDecl 2080 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2081 2082 // Even though union members never have non-trivial default 2083 // constructions in C++03, we still build member initializers for aggregate 2084 // record types which can be union members, and C++0x allows non-trivial 2085 // default constructors for union members, so we ensure that only one 2086 // member is initialized for these. 2087 if (FieldClassDecl->isUnion()) { 2088 // First check for an explicit initializer for one field. 2089 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2090 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2091 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2092 Info.AllToInit.push_back(Init); 2093 2094 // Once we've initialized a field of an anonymous union, the union 2095 // field in the class is also initialized, so exit immediately. 2096 return false; 2097 } else if ((*FA)->isAnonymousStructOrUnion()) { 2098 if (CollectFieldInitializer(Info, Top, *FA)) 2099 return true; 2100 } 2101 } 2102 2103 // Fallthrough and construct a default initializer for the union as 2104 // a whole, which can call its default constructor if such a thing exists 2105 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2106 // behavior going forward with C++0x, when anonymous unions there are 2107 // finalized, we should revisit this. 2108 } else { 2109 // For structs, we simply descend through to initialize all members where 2110 // necessary. 2111 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2112 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2113 if (CollectFieldInitializer(Info, Top, *FA)) 2114 return true; 2115 } 2116 } 2117 } 2118 2119 // Don't try to build an implicit initializer if there were semantic 2120 // errors in any of the initializers (and therefore we might be 2121 // missing some that the user actually wrote). 2122 if (Info.AnyErrorsInInits) 2123 return false; 2124 2125 CXXCtorInitializer *Init = 0; 2126 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2127 return true; 2128 2129 if (Init) 2130 Info.AllToInit.push_back(Init); 2131 2132 return false; 2133} 2134 2135bool 2136Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2137 CXXCtorInitializer *Initializer) { 2138 assert(Initializer->isDelegatingInitializer()); 2139 Constructor->setNumCtorInitializers(1); 2140 CXXCtorInitializer **initializer = 2141 new (Context) CXXCtorInitializer*[1]; 2142 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2143 Constructor->setCtorInitializers(initializer); 2144 2145 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2146 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2147 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2148 } 2149 2150 DelegatingCtorDecls.push_back(Constructor); 2151 2152 return false; 2153} 2154 2155bool 2156Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2157 CXXCtorInitializer **Initializers, 2158 unsigned NumInitializers, 2159 bool AnyErrors) { 2160 if (Constructor->getDeclContext()->isDependentContext()) { 2161 // Just store the initializers as written, they will be checked during 2162 // instantiation. 2163 if (NumInitializers > 0) { 2164 Constructor->setNumCtorInitializers(NumInitializers); 2165 CXXCtorInitializer **baseOrMemberInitializers = 2166 new (Context) CXXCtorInitializer*[NumInitializers]; 2167 memcpy(baseOrMemberInitializers, Initializers, 2168 NumInitializers * sizeof(CXXCtorInitializer*)); 2169 Constructor->setCtorInitializers(baseOrMemberInitializers); 2170 } 2171 2172 return false; 2173 } 2174 2175 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2176 2177 // We need to build the initializer AST according to order of construction 2178 // and not what user specified in the Initializers list. 2179 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2180 if (!ClassDecl) 2181 return true; 2182 2183 bool HadError = false; 2184 2185 for (unsigned i = 0; i < NumInitializers; i++) { 2186 CXXCtorInitializer *Member = Initializers[i]; 2187 2188 if (Member->isBaseInitializer()) 2189 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2190 else 2191 Info.AllBaseFields[Member->getAnyMember()] = Member; 2192 } 2193 2194 // Keep track of the direct virtual bases. 2195 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2196 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2197 E = ClassDecl->bases_end(); I != E; ++I) { 2198 if (I->isVirtual()) 2199 DirectVBases.insert(I); 2200 } 2201 2202 // Push virtual bases before others. 2203 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2204 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2205 2206 if (CXXCtorInitializer *Value 2207 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2208 Info.AllToInit.push_back(Value); 2209 } else if (!AnyErrors) { 2210 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2211 CXXCtorInitializer *CXXBaseInit; 2212 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2213 VBase, IsInheritedVirtualBase, 2214 CXXBaseInit)) { 2215 HadError = true; 2216 continue; 2217 } 2218 2219 Info.AllToInit.push_back(CXXBaseInit); 2220 } 2221 } 2222 2223 // Non-virtual bases. 2224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2225 E = ClassDecl->bases_end(); Base != E; ++Base) { 2226 // Virtuals are in the virtual base list and already constructed. 2227 if (Base->isVirtual()) 2228 continue; 2229 2230 if (CXXCtorInitializer *Value 2231 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2232 Info.AllToInit.push_back(Value); 2233 } else if (!AnyErrors) { 2234 CXXCtorInitializer *CXXBaseInit; 2235 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2236 Base, /*IsInheritedVirtualBase=*/false, 2237 CXXBaseInit)) { 2238 HadError = true; 2239 continue; 2240 } 2241 2242 Info.AllToInit.push_back(CXXBaseInit); 2243 } 2244 } 2245 2246 // Fields. 2247 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2248 E = ClassDecl->field_end(); Field != E; ++Field) { 2249 if ((*Field)->getType()->isIncompleteArrayType()) { 2250 assert(ClassDecl->hasFlexibleArrayMember() && 2251 "Incomplete array type is not valid"); 2252 continue; 2253 } 2254 if (CollectFieldInitializer(Info, *Field, *Field)) 2255 HadError = true; 2256 } 2257 2258 NumInitializers = Info.AllToInit.size(); 2259 if (NumInitializers > 0) { 2260 Constructor->setNumCtorInitializers(NumInitializers); 2261 CXXCtorInitializer **baseOrMemberInitializers = 2262 new (Context) CXXCtorInitializer*[NumInitializers]; 2263 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2264 NumInitializers * sizeof(CXXCtorInitializer*)); 2265 Constructor->setCtorInitializers(baseOrMemberInitializers); 2266 2267 // Constructors implicitly reference the base and member 2268 // destructors. 2269 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2270 Constructor->getParent()); 2271 } 2272 2273 return HadError; 2274} 2275 2276static void *GetKeyForTopLevelField(FieldDecl *Field) { 2277 // For anonymous unions, use the class declaration as the key. 2278 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2279 if (RT->getDecl()->isAnonymousStructOrUnion()) 2280 return static_cast<void *>(RT->getDecl()); 2281 } 2282 return static_cast<void *>(Field); 2283} 2284 2285static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2286 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2287} 2288 2289static void *GetKeyForMember(ASTContext &Context, 2290 CXXCtorInitializer *Member) { 2291 if (!Member->isAnyMemberInitializer()) 2292 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2293 2294 // For fields injected into the class via declaration of an anonymous union, 2295 // use its anonymous union class declaration as the unique key. 2296 FieldDecl *Field = Member->getAnyMember(); 2297 2298 // If the field is a member of an anonymous struct or union, our key 2299 // is the anonymous record decl that's a direct child of the class. 2300 RecordDecl *RD = Field->getParent(); 2301 if (RD->isAnonymousStructOrUnion()) { 2302 while (true) { 2303 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2304 if (Parent->isAnonymousStructOrUnion()) 2305 RD = Parent; 2306 else 2307 break; 2308 } 2309 2310 return static_cast<void *>(RD); 2311 } 2312 2313 return static_cast<void *>(Field); 2314} 2315 2316static void 2317DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2318 const CXXConstructorDecl *Constructor, 2319 CXXCtorInitializer **Inits, 2320 unsigned NumInits) { 2321 if (Constructor->getDeclContext()->isDependentContext()) 2322 return; 2323 2324 // Don't check initializers order unless the warning is enabled at the 2325 // location of at least one initializer. 2326 bool ShouldCheckOrder = false; 2327 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2328 CXXCtorInitializer *Init = Inits[InitIndex]; 2329 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2330 Init->getSourceLocation()) 2331 != Diagnostic::Ignored) { 2332 ShouldCheckOrder = true; 2333 break; 2334 } 2335 } 2336 if (!ShouldCheckOrder) 2337 return; 2338 2339 // Build the list of bases and members in the order that they'll 2340 // actually be initialized. The explicit initializers should be in 2341 // this same order but may be missing things. 2342 llvm::SmallVector<const void*, 32> IdealInitKeys; 2343 2344 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2345 2346 // 1. Virtual bases. 2347 for (CXXRecordDecl::base_class_const_iterator VBase = 2348 ClassDecl->vbases_begin(), 2349 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2350 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2351 2352 // 2. Non-virtual bases. 2353 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2354 E = ClassDecl->bases_end(); Base != E; ++Base) { 2355 if (Base->isVirtual()) 2356 continue; 2357 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2358 } 2359 2360 // 3. Direct fields. 2361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2362 E = ClassDecl->field_end(); Field != E; ++Field) 2363 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2364 2365 unsigned NumIdealInits = IdealInitKeys.size(); 2366 unsigned IdealIndex = 0; 2367 2368 CXXCtorInitializer *PrevInit = 0; 2369 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2370 CXXCtorInitializer *Init = Inits[InitIndex]; 2371 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2372 2373 // Scan forward to try to find this initializer in the idealized 2374 // initializers list. 2375 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2376 if (InitKey == IdealInitKeys[IdealIndex]) 2377 break; 2378 2379 // If we didn't find this initializer, it must be because we 2380 // scanned past it on a previous iteration. That can only 2381 // happen if we're out of order; emit a warning. 2382 if (IdealIndex == NumIdealInits && PrevInit) { 2383 Sema::SemaDiagnosticBuilder D = 2384 SemaRef.Diag(PrevInit->getSourceLocation(), 2385 diag::warn_initializer_out_of_order); 2386 2387 if (PrevInit->isAnyMemberInitializer()) 2388 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2389 else 2390 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2391 2392 if (Init->isAnyMemberInitializer()) 2393 D << 0 << Init->getAnyMember()->getDeclName(); 2394 else 2395 D << 1 << Init->getBaseClassInfo()->getType(); 2396 2397 // Move back to the initializer's location in the ideal list. 2398 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2399 if (InitKey == IdealInitKeys[IdealIndex]) 2400 break; 2401 2402 assert(IdealIndex != NumIdealInits && 2403 "initializer not found in initializer list"); 2404 } 2405 2406 PrevInit = Init; 2407 } 2408} 2409 2410namespace { 2411bool CheckRedundantInit(Sema &S, 2412 CXXCtorInitializer *Init, 2413 CXXCtorInitializer *&PrevInit) { 2414 if (!PrevInit) { 2415 PrevInit = Init; 2416 return false; 2417 } 2418 2419 if (FieldDecl *Field = Init->getMember()) 2420 S.Diag(Init->getSourceLocation(), 2421 diag::err_multiple_mem_initialization) 2422 << Field->getDeclName() 2423 << Init->getSourceRange(); 2424 else { 2425 const Type *BaseClass = Init->getBaseClass(); 2426 assert(BaseClass && "neither field nor base"); 2427 S.Diag(Init->getSourceLocation(), 2428 diag::err_multiple_base_initialization) 2429 << QualType(BaseClass, 0) 2430 << Init->getSourceRange(); 2431 } 2432 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2433 << 0 << PrevInit->getSourceRange(); 2434 2435 return true; 2436} 2437 2438typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2439typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2440 2441bool CheckRedundantUnionInit(Sema &S, 2442 CXXCtorInitializer *Init, 2443 RedundantUnionMap &Unions) { 2444 FieldDecl *Field = Init->getAnyMember(); 2445 RecordDecl *Parent = Field->getParent(); 2446 if (!Parent->isAnonymousStructOrUnion()) 2447 return false; 2448 2449 NamedDecl *Child = Field; 2450 do { 2451 if (Parent->isUnion()) { 2452 UnionEntry &En = Unions[Parent]; 2453 if (En.first && En.first != Child) { 2454 S.Diag(Init->getSourceLocation(), 2455 diag::err_multiple_mem_union_initialization) 2456 << Field->getDeclName() 2457 << Init->getSourceRange(); 2458 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2459 << 0 << En.second->getSourceRange(); 2460 return true; 2461 } else if (!En.first) { 2462 En.first = Child; 2463 En.second = Init; 2464 } 2465 } 2466 2467 Child = Parent; 2468 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2469 } while (Parent->isAnonymousStructOrUnion()); 2470 2471 return false; 2472} 2473} 2474 2475/// ActOnMemInitializers - Handle the member initializers for a constructor. 2476void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2477 SourceLocation ColonLoc, 2478 MemInitTy **meminits, unsigned NumMemInits, 2479 bool AnyErrors) { 2480 if (!ConstructorDecl) 2481 return; 2482 2483 AdjustDeclIfTemplate(ConstructorDecl); 2484 2485 CXXConstructorDecl *Constructor 2486 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2487 2488 if (!Constructor) { 2489 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2490 return; 2491 } 2492 2493 CXXCtorInitializer **MemInits = 2494 reinterpret_cast<CXXCtorInitializer **>(meminits); 2495 2496 // Mapping for the duplicate initializers check. 2497 // For member initializers, this is keyed with a FieldDecl*. 2498 // For base initializers, this is keyed with a Type*. 2499 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2500 2501 // Mapping for the inconsistent anonymous-union initializers check. 2502 RedundantUnionMap MemberUnions; 2503 2504 bool HadError = false; 2505 for (unsigned i = 0; i < NumMemInits; i++) { 2506 CXXCtorInitializer *Init = MemInits[i]; 2507 2508 // Set the source order index. 2509 Init->setSourceOrder(i); 2510 2511 if (Init->isAnyMemberInitializer()) { 2512 FieldDecl *Field = Init->getAnyMember(); 2513 if (CheckRedundantInit(*this, Init, Members[Field]) || 2514 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2515 HadError = true; 2516 } else if (Init->isBaseInitializer()) { 2517 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2518 if (CheckRedundantInit(*this, Init, Members[Key])) 2519 HadError = true; 2520 } else { 2521 assert(Init->isDelegatingInitializer()); 2522 // This must be the only initializer 2523 if (i != 0 || NumMemInits > 1) { 2524 Diag(MemInits[0]->getSourceLocation(), 2525 diag::err_delegating_initializer_alone) 2526 << MemInits[0]->getSourceRange(); 2527 HadError = true; 2528 // We will treat this as being the only initializer. 2529 } 2530 SetDelegatingInitializer(Constructor, MemInits[i]); 2531 // Return immediately as the initializer is set. 2532 return; 2533 } 2534 } 2535 2536 if (HadError) 2537 return; 2538 2539 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2540 2541 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2542} 2543 2544void 2545Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2546 CXXRecordDecl *ClassDecl) { 2547 // Ignore dependent contexts. 2548 if (ClassDecl->isDependentContext()) 2549 return; 2550 2551 // FIXME: all the access-control diagnostics are positioned on the 2552 // field/base declaration. That's probably good; that said, the 2553 // user might reasonably want to know why the destructor is being 2554 // emitted, and we currently don't say. 2555 2556 // Non-static data members. 2557 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2558 E = ClassDecl->field_end(); I != E; ++I) { 2559 FieldDecl *Field = *I; 2560 if (Field->isInvalidDecl()) 2561 continue; 2562 QualType FieldType = Context.getBaseElementType(Field->getType()); 2563 2564 const RecordType* RT = FieldType->getAs<RecordType>(); 2565 if (!RT) 2566 continue; 2567 2568 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2569 if (FieldClassDecl->isInvalidDecl()) 2570 continue; 2571 if (FieldClassDecl->hasTrivialDestructor()) 2572 continue; 2573 2574 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2575 assert(Dtor && "No dtor found for FieldClassDecl!"); 2576 CheckDestructorAccess(Field->getLocation(), Dtor, 2577 PDiag(diag::err_access_dtor_field) 2578 << Field->getDeclName() 2579 << FieldType); 2580 2581 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2582 } 2583 2584 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2585 2586 // Bases. 2587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2588 E = ClassDecl->bases_end(); Base != E; ++Base) { 2589 // Bases are always records in a well-formed non-dependent class. 2590 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2591 2592 // Remember direct virtual bases. 2593 if (Base->isVirtual()) 2594 DirectVirtualBases.insert(RT); 2595 2596 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2597 // If our base class is invalid, we probably can't get its dtor anyway. 2598 if (BaseClassDecl->isInvalidDecl()) 2599 continue; 2600 // Ignore trivial destructors. 2601 if (BaseClassDecl->hasTrivialDestructor()) 2602 continue; 2603 2604 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2605 assert(Dtor && "No dtor found for BaseClassDecl!"); 2606 2607 // FIXME: caret should be on the start of the class name 2608 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2609 PDiag(diag::err_access_dtor_base) 2610 << Base->getType() 2611 << Base->getSourceRange()); 2612 2613 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2614 } 2615 2616 // Virtual bases. 2617 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2618 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2619 2620 // Bases are always records in a well-formed non-dependent class. 2621 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2622 2623 // Ignore direct virtual bases. 2624 if (DirectVirtualBases.count(RT)) 2625 continue; 2626 2627 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2628 // If our base class is invalid, we probably can't get its dtor anyway. 2629 if (BaseClassDecl->isInvalidDecl()) 2630 continue; 2631 // Ignore trivial destructors. 2632 if (BaseClassDecl->hasTrivialDestructor()) 2633 continue; 2634 2635 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2636 assert(Dtor && "No dtor found for BaseClassDecl!"); 2637 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2638 PDiag(diag::err_access_dtor_vbase) 2639 << VBase->getType()); 2640 2641 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2642 } 2643} 2644 2645void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2646 if (!CDtorDecl) 2647 return; 2648 2649 if (CXXConstructorDecl *Constructor 2650 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2651 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2652} 2653 2654bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2655 unsigned DiagID, AbstractDiagSelID SelID) { 2656 if (SelID == -1) 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2658 else 2659 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2660} 2661 2662bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2663 const PartialDiagnostic &PD) { 2664 if (!getLangOptions().CPlusPlus) 2665 return false; 2666 2667 if (const ArrayType *AT = Context.getAsArrayType(T)) 2668 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2669 2670 if (const PointerType *PT = T->getAs<PointerType>()) { 2671 // Find the innermost pointer type. 2672 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2673 PT = T; 2674 2675 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2676 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2677 } 2678 2679 const RecordType *RT = T->getAs<RecordType>(); 2680 if (!RT) 2681 return false; 2682 2683 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2684 2685 // We can't answer whether something is abstract until it has a 2686 // definition. If it's currently being defined, we'll walk back 2687 // over all the declarations when we have a full definition. 2688 const CXXRecordDecl *Def = RD->getDefinition(); 2689 if (!Def || Def->isBeingDefined()) 2690 return false; 2691 2692 if (!RD->isAbstract()) 2693 return false; 2694 2695 Diag(Loc, PD) << RD->getDeclName(); 2696 DiagnoseAbstractType(RD); 2697 2698 return true; 2699} 2700 2701void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2702 // Check if we've already emitted the list of pure virtual functions 2703 // for this class. 2704 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2705 return; 2706 2707 CXXFinalOverriderMap FinalOverriders; 2708 RD->getFinalOverriders(FinalOverriders); 2709 2710 // Keep a set of seen pure methods so we won't diagnose the same method 2711 // more than once. 2712 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2713 2714 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2715 MEnd = FinalOverriders.end(); 2716 M != MEnd; 2717 ++M) { 2718 for (OverridingMethods::iterator SO = M->second.begin(), 2719 SOEnd = M->second.end(); 2720 SO != SOEnd; ++SO) { 2721 // C++ [class.abstract]p4: 2722 // A class is abstract if it contains or inherits at least one 2723 // pure virtual function for which the final overrider is pure 2724 // virtual. 2725 2726 // 2727 if (SO->second.size() != 1) 2728 continue; 2729 2730 if (!SO->second.front().Method->isPure()) 2731 continue; 2732 2733 if (!SeenPureMethods.insert(SO->second.front().Method)) 2734 continue; 2735 2736 Diag(SO->second.front().Method->getLocation(), 2737 diag::note_pure_virtual_function) 2738 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2739 } 2740 } 2741 2742 if (!PureVirtualClassDiagSet) 2743 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2744 PureVirtualClassDiagSet->insert(RD); 2745} 2746 2747namespace { 2748struct AbstractUsageInfo { 2749 Sema &S; 2750 CXXRecordDecl *Record; 2751 CanQualType AbstractType; 2752 bool Invalid; 2753 2754 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2755 : S(S), Record(Record), 2756 AbstractType(S.Context.getCanonicalType( 2757 S.Context.getTypeDeclType(Record))), 2758 Invalid(false) {} 2759 2760 void DiagnoseAbstractType() { 2761 if (Invalid) return; 2762 S.DiagnoseAbstractType(Record); 2763 Invalid = true; 2764 } 2765 2766 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2767}; 2768 2769struct CheckAbstractUsage { 2770 AbstractUsageInfo &Info; 2771 const NamedDecl *Ctx; 2772 2773 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2774 : Info(Info), Ctx(Ctx) {} 2775 2776 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2777 switch (TL.getTypeLocClass()) { 2778#define ABSTRACT_TYPELOC(CLASS, PARENT) 2779#define TYPELOC(CLASS, PARENT) \ 2780 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2781#include "clang/AST/TypeLocNodes.def" 2782 } 2783 } 2784 2785 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2786 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2787 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2788 if (!TL.getArg(I)) 2789 continue; 2790 2791 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2792 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2793 } 2794 } 2795 2796 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2797 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2798 } 2799 2800 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2801 // Visit the type parameters from a permissive context. 2802 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2803 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2804 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2805 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2806 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2807 // TODO: other template argument types? 2808 } 2809 } 2810 2811 // Visit pointee types from a permissive context. 2812#define CheckPolymorphic(Type) \ 2813 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2814 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2815 } 2816 CheckPolymorphic(PointerTypeLoc) 2817 CheckPolymorphic(ReferenceTypeLoc) 2818 CheckPolymorphic(MemberPointerTypeLoc) 2819 CheckPolymorphic(BlockPointerTypeLoc) 2820 2821 /// Handle all the types we haven't given a more specific 2822 /// implementation for above. 2823 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2824 // Every other kind of type that we haven't called out already 2825 // that has an inner type is either (1) sugar or (2) contains that 2826 // inner type in some way as a subobject. 2827 if (TypeLoc Next = TL.getNextTypeLoc()) 2828 return Visit(Next, Sel); 2829 2830 // If there's no inner type and we're in a permissive context, 2831 // don't diagnose. 2832 if (Sel == Sema::AbstractNone) return; 2833 2834 // Check whether the type matches the abstract type. 2835 QualType T = TL.getType(); 2836 if (T->isArrayType()) { 2837 Sel = Sema::AbstractArrayType; 2838 T = Info.S.Context.getBaseElementType(T); 2839 } 2840 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2841 if (CT != Info.AbstractType) return; 2842 2843 // It matched; do some magic. 2844 if (Sel == Sema::AbstractArrayType) { 2845 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2846 << T << TL.getSourceRange(); 2847 } else { 2848 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2849 << Sel << T << TL.getSourceRange(); 2850 } 2851 Info.DiagnoseAbstractType(); 2852 } 2853}; 2854 2855void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2856 Sema::AbstractDiagSelID Sel) { 2857 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2858} 2859 2860} 2861 2862/// Check for invalid uses of an abstract type in a method declaration. 2863static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2864 CXXMethodDecl *MD) { 2865 // No need to do the check on definitions, which require that 2866 // the return/param types be complete. 2867 if (MD->doesThisDeclarationHaveABody()) 2868 return; 2869 2870 // For safety's sake, just ignore it if we don't have type source 2871 // information. This should never happen for non-implicit methods, 2872 // but... 2873 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2874 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2875} 2876 2877/// Check for invalid uses of an abstract type within a class definition. 2878static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2879 CXXRecordDecl *RD) { 2880 for (CXXRecordDecl::decl_iterator 2881 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2882 Decl *D = *I; 2883 if (D->isImplicit()) continue; 2884 2885 // Methods and method templates. 2886 if (isa<CXXMethodDecl>(D)) { 2887 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2888 } else if (isa<FunctionTemplateDecl>(D)) { 2889 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2890 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2891 2892 // Fields and static variables. 2893 } else if (isa<FieldDecl>(D)) { 2894 FieldDecl *FD = cast<FieldDecl>(D); 2895 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2896 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2897 } else if (isa<VarDecl>(D)) { 2898 VarDecl *VD = cast<VarDecl>(D); 2899 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2900 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2901 2902 // Nested classes and class templates. 2903 } else if (isa<CXXRecordDecl>(D)) { 2904 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2905 } else if (isa<ClassTemplateDecl>(D)) { 2906 CheckAbstractClassUsage(Info, 2907 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2908 } 2909 } 2910} 2911 2912/// \brief Perform semantic checks on a class definition that has been 2913/// completing, introducing implicitly-declared members, checking for 2914/// abstract types, etc. 2915void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2916 if (!Record) 2917 return; 2918 2919 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2920 AbstractUsageInfo Info(*this, Record); 2921 CheckAbstractClassUsage(Info, Record); 2922 } 2923 2924 // If this is not an aggregate type and has no user-declared constructor, 2925 // complain about any non-static data members of reference or const scalar 2926 // type, since they will never get initializers. 2927 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2928 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2929 bool Complained = false; 2930 for (RecordDecl::field_iterator F = Record->field_begin(), 2931 FEnd = Record->field_end(); 2932 F != FEnd; ++F) { 2933 if (F->getType()->isReferenceType() || 2934 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2935 if (!Complained) { 2936 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2937 << Record->getTagKind() << Record; 2938 Complained = true; 2939 } 2940 2941 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2942 << F->getType()->isReferenceType() 2943 << F->getDeclName(); 2944 } 2945 } 2946 } 2947 2948 if (Record->isDynamicClass() && !Record->isDependentType()) 2949 DynamicClasses.push_back(Record); 2950 2951 if (Record->getIdentifier()) { 2952 // C++ [class.mem]p13: 2953 // If T is the name of a class, then each of the following shall have a 2954 // name different from T: 2955 // - every member of every anonymous union that is a member of class T. 2956 // 2957 // C++ [class.mem]p14: 2958 // In addition, if class T has a user-declared constructor (12.1), every 2959 // non-static data member of class T shall have a name different from T. 2960 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2961 R.first != R.second; ++R.first) { 2962 NamedDecl *D = *R.first; 2963 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2964 isa<IndirectFieldDecl>(D)) { 2965 Diag(D->getLocation(), diag::err_member_name_of_class) 2966 << D->getDeclName(); 2967 break; 2968 } 2969 } 2970 } 2971 2972 // Warn if the class has virtual methods but non-virtual public destructor. 2973 if (Record->isPolymorphic() && !Record->isDependentType()) { 2974 CXXDestructorDecl *dtor = Record->getDestructor(); 2975 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2976 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2977 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2978 } 2979 2980 // See if a method overloads virtual methods in a base 2981 /// class without overriding any. 2982 if (!Record->isDependentType()) { 2983 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2984 MEnd = Record->method_end(); 2985 M != MEnd; ++M) { 2986 if (!(*M)->isStatic()) 2987 DiagnoseHiddenVirtualMethods(Record, *M); 2988 } 2989 } 2990 2991 // Declare inherited constructors. We do this eagerly here because: 2992 // - The standard requires an eager diagnostic for conflicting inherited 2993 // constructors from different classes. 2994 // - The lazy declaration of the other implicit constructors is so as to not 2995 // waste space and performance on classes that are not meant to be 2996 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2997 // have inherited constructors. 2998 DeclareInheritedConstructors(Record); 2999 3000 CheckExplicitlyDefaultedMethods(Record); 3001} 3002 3003void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3004 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3005 ME = Record->method_end(); 3006 MI != ME; ++MI) { 3007 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3008 switch (getSpecialMember(*MI)) { 3009 case CXXDefaultConstructor: 3010 CheckExplicitlyDefaultedDefaultConstructor( 3011 cast<CXXConstructorDecl>(*MI)); 3012 break; 3013 3014 case CXXDestructor: 3015 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3016 break; 3017 3018 case CXXCopyConstructor: 3019 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3020 break; 3021 3022 case CXXCopyAssignment: 3023 CheckExplicitlyDefaultedCopyAssignment(*MI); 3024 break; 3025 3026 default: 3027 // FIXME: Do moves once they exist 3028 llvm_unreachable("non-special member explicitly defaulted!"); 3029 } 3030 } 3031 } 3032 3033} 3034 3035void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3036 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3037 3038 // Whether this was the first-declared instance of the constructor. 3039 // This affects whether we implicitly add an exception spec (and, eventually, 3040 // constexpr). It is also ill-formed to explicitly default a constructor such 3041 // that it would be deleted. (C++0x [decl.fct.def.default]) 3042 bool First = CD == CD->getCanonicalDecl(); 3043 3044 bool HadError = false; 3045 if (CD->getNumParams() != 0) { 3046 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3047 << CD->getSourceRange(); 3048 HadError = true; 3049 } 3050 3051 ImplicitExceptionSpecification Spec 3052 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3053 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3054 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3055 *ExceptionType = Context.getFunctionType( 3056 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3057 3058 if (CtorType->hasExceptionSpec()) { 3059 if (CheckEquivalentExceptionSpec( 3060 PDiag(diag::err_incorrect_defaulted_exception_spec) 3061 << 0 /* default constructor */, 3062 PDiag(), 3063 ExceptionType, SourceLocation(), 3064 CtorType, CD->getLocation())) { 3065 HadError = true; 3066 } 3067 } else if (First) { 3068 // We set the declaration to have the computed exception spec here. 3069 // We know there are no parameters. 3070 EPI.ExtInfo = CtorType->getExtInfo(); 3071 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3072 } 3073 3074 if (HadError) { 3075 CD->setInvalidDecl(); 3076 return; 3077 } 3078 3079 if (ShouldDeleteDefaultConstructor(CD)) { 3080 if (First) { 3081 CD->setDeletedAsWritten(); 3082 } else { 3083 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3084 << 0 /* default constructor */; 3085 CD->setInvalidDecl(); 3086 } 3087 } 3088} 3089 3090void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3091 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3092 3093 // Whether this was the first-declared instance of the constructor. 3094 bool First = CD == CD->getCanonicalDecl(); 3095 3096 bool HadError = false; 3097 if (CD->getNumParams() != 1) { 3098 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3099 << CD->getSourceRange(); 3100 HadError = true; 3101 } 3102 3103 ImplicitExceptionSpecification Spec(Context); 3104 bool Const; 3105 llvm::tie(Spec, Const) = 3106 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3107 3108 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3109 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3110 *ExceptionType = Context.getFunctionType( 3111 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3112 3113 // Check for parameter type matching. 3114 // This is a copy ctor so we know it's a cv-qualified reference to T. 3115 QualType ArgType = CtorType->getArgType(0); 3116 if (ArgType->getPointeeType().isVolatileQualified()) { 3117 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3118 HadError = true; 3119 } 3120 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3121 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3122 HadError = true; 3123 } 3124 3125 if (CtorType->hasExceptionSpec()) { 3126 if (CheckEquivalentExceptionSpec( 3127 PDiag(diag::err_incorrect_defaulted_exception_spec) 3128 << 1 /* copy constructor */, 3129 PDiag(), 3130 ExceptionType, SourceLocation(), 3131 CtorType, CD->getLocation())) { 3132 HadError = true; 3133 } 3134 } else if (First) { 3135 // We set the declaration to have the computed exception spec here. 3136 // We duplicate the one parameter type. 3137 EPI.ExtInfo = CtorType->getExtInfo(); 3138 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3139 } 3140 3141 if (HadError) { 3142 CD->setInvalidDecl(); 3143 return; 3144 } 3145 3146 if (ShouldDeleteCopyConstructor(CD)) { 3147 if (First) { 3148 CD->setDeletedAsWritten(); 3149 } else { 3150 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3151 << 1 /* copy constructor */; 3152 CD->setInvalidDecl(); 3153 } 3154 } 3155} 3156 3157void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3158 assert(MD->isExplicitlyDefaulted()); 3159 3160 // Whether this was the first-declared instance of the operator 3161 bool First = MD == MD->getCanonicalDecl(); 3162 3163 bool HadError = false; 3164 if (MD->getNumParams() != 1) { 3165 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3166 << MD->getSourceRange(); 3167 HadError = true; 3168 } 3169 3170 QualType ReturnType = 3171 MD->getType()->getAs<FunctionType>()->getResultType(); 3172 if (!ReturnType->isLValueReferenceType() || 3173 !Context.hasSameType( 3174 Context.getCanonicalType(ReturnType->getPointeeType()), 3175 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3176 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3177 HadError = true; 3178 } 3179 3180 ImplicitExceptionSpecification Spec(Context); 3181 bool Const; 3182 llvm::tie(Spec, Const) = 3183 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3184 3185 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3186 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3187 *ExceptionType = Context.getFunctionType( 3188 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3189 3190 QualType ArgType = OperType->getArgType(0); 3191 if (!ArgType->isReferenceType()) { 3192 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3193 HadError = true; 3194 } else { 3195 if (ArgType->getPointeeType().isVolatileQualified()) { 3196 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3197 HadError = true; 3198 } 3199 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3200 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3201 HadError = true; 3202 } 3203 } 3204 3205 if (OperType->getTypeQuals()) { 3206 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3207 HadError = true; 3208 } 3209 3210 if (OperType->hasExceptionSpec()) { 3211 if (CheckEquivalentExceptionSpec( 3212 PDiag(diag::err_incorrect_defaulted_exception_spec) 3213 << 2 /* copy assignment operator */, 3214 PDiag(), 3215 ExceptionType, SourceLocation(), 3216 OperType, MD->getLocation())) { 3217 HadError = true; 3218 } 3219 } else if (First) { 3220 // We set the declaration to have the computed exception spec here. 3221 // We duplicate the one parameter type. 3222 EPI.RefQualifier = OperType->getRefQualifier(); 3223 EPI.ExtInfo = OperType->getExtInfo(); 3224 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3225 } 3226 3227 if (HadError) { 3228 MD->setInvalidDecl(); 3229 return; 3230 } 3231 3232 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3233 if (First) { 3234 MD->setDeletedAsWritten(); 3235 } else { 3236 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3237 << 2 /* copy assignment operator */; 3238 MD->setInvalidDecl(); 3239 } 3240 } 3241} 3242 3243void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3244 assert(DD->isExplicitlyDefaulted()); 3245 3246 // Whether this was the first-declared instance of the destructor. 3247 bool First = DD == DD->getCanonicalDecl(); 3248 3249 ImplicitExceptionSpecification Spec 3250 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3251 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3252 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3253 *ExceptionType = Context.getFunctionType( 3254 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3255 3256 if (DtorType->hasExceptionSpec()) { 3257 if (CheckEquivalentExceptionSpec( 3258 PDiag(diag::err_incorrect_defaulted_exception_spec) 3259 << 3 /* destructor */, 3260 PDiag(), 3261 ExceptionType, SourceLocation(), 3262 DtorType, DD->getLocation())) { 3263 DD->setInvalidDecl(); 3264 return; 3265 } 3266 } else if (First) { 3267 // We set the declaration to have the computed exception spec here. 3268 // There are no parameters. 3269 EPI.ExtInfo = DtorType->getExtInfo(); 3270 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3271 } 3272 3273 if (ShouldDeleteDestructor(DD)) { 3274 if (First) { 3275 DD->setDeletedAsWritten(); 3276 } else { 3277 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3278 << 3 /* destructor */; 3279 DD->setInvalidDecl(); 3280 } 3281 } 3282} 3283 3284bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3285 CXXRecordDecl *RD = CD->getParent(); 3286 assert(!RD->isDependentType() && "do deletion after instantiation"); 3287 if (!LangOpts.CPlusPlus0x) 3288 return false; 3289 3290 SourceLocation Loc = CD->getLocation(); 3291 3292 // Do access control from the constructor 3293 ContextRAII CtorContext(*this, CD); 3294 3295 bool Union = RD->isUnion(); 3296 bool AllConst = true; 3297 3298 // We do this because we should never actually use an anonymous 3299 // union's constructor. 3300 if (Union && RD->isAnonymousStructOrUnion()) 3301 return false; 3302 3303 // FIXME: We should put some diagnostic logic right into this function. 3304 3305 // C++0x [class.ctor]/5 3306 // A defaulted default constructor for class X is defined as delete if: 3307 3308 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3309 BE = RD->bases_end(); 3310 BI != BE; ++BI) { 3311 // We'll handle this one later 3312 if (BI->isVirtual()) 3313 continue; 3314 3315 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3316 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3317 3318 // -- any [direct base class] has a type with a destructor that is 3319 // delete or inaccessible from the defaulted default constructor 3320 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3321 if (BaseDtor->isDeleted()) 3322 return true; 3323 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3324 AR_accessible) 3325 return true; 3326 3327 // -- any [direct base class either] has no default constructor or 3328 // overload resolution as applied to [its] default constructor 3329 // results in an ambiguity or in a function that is deleted or 3330 // inaccessible from the defaulted default constructor 3331 InitializedEntity BaseEntity = 3332 InitializedEntity::InitializeBase(Context, BI, 0); 3333 InitializationKind Kind = 3334 InitializationKind::CreateDirect(Loc, Loc, Loc); 3335 3336 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3337 3338 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3339 return true; 3340 } 3341 3342 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3343 BE = RD->vbases_end(); 3344 BI != BE; ++BI) { 3345 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3346 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3347 3348 // -- any [virtual base class] has a type with a destructor that is 3349 // delete or inaccessible from the defaulted default constructor 3350 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3351 if (BaseDtor->isDeleted()) 3352 return true; 3353 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3354 AR_accessible) 3355 return true; 3356 3357 // -- any [virtual base class either] has no default constructor or 3358 // overload resolution as applied to [its] default constructor 3359 // results in an ambiguity or in a function that is deleted or 3360 // inaccessible from the defaulted default constructor 3361 InitializedEntity BaseEntity = 3362 InitializedEntity::InitializeBase(Context, BI, BI); 3363 InitializationKind Kind = 3364 InitializationKind::CreateDirect(Loc, Loc, Loc); 3365 3366 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3367 3368 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3369 return true; 3370 } 3371 3372 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3373 FE = RD->field_end(); 3374 FI != FE; ++FI) { 3375 QualType FieldType = Context.getBaseElementType(FI->getType()); 3376 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3377 3378 // -- any non-static data member with no brace-or-equal-initializer is of 3379 // reference type 3380 if (FieldType->isReferenceType()) 3381 return true; 3382 3383 // -- X is a union and all its variant members are of const-qualified type 3384 // (or array thereof) 3385 if (Union && !FieldType.isConstQualified()) 3386 AllConst = false; 3387 3388 if (FieldRecord) { 3389 // -- X is a union-like class that has a variant member with a non-trivial 3390 // default constructor 3391 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3392 return true; 3393 3394 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3395 if (FieldDtor->isDeleted()) 3396 return true; 3397 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3398 AR_accessible) 3399 return true; 3400 3401 // -- any non-variant non-static data member of const-qualified type (or 3402 // array thereof) with no brace-or-equal-initializer does not have a 3403 // user-provided default constructor 3404 if (FieldType.isConstQualified() && 3405 !FieldRecord->hasUserProvidedDefaultConstructor()) 3406 return true; 3407 3408 if (!Union && FieldRecord->isUnion() && 3409 FieldRecord->isAnonymousStructOrUnion()) { 3410 // We're okay to reuse AllConst here since we only care about the 3411 // value otherwise if we're in a union. 3412 AllConst = true; 3413 3414 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3415 UE = FieldRecord->field_end(); 3416 UI != UE; ++UI) { 3417 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3418 CXXRecordDecl *UnionFieldRecord = 3419 UnionFieldType->getAsCXXRecordDecl(); 3420 3421 if (!UnionFieldType.isConstQualified()) 3422 AllConst = false; 3423 3424 if (UnionFieldRecord && 3425 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3426 return true; 3427 } 3428 3429 if (AllConst) 3430 return true; 3431 3432 // Don't try to initialize the anonymous union 3433 // This is technically non-conformant, but sanity demands it. 3434 continue; 3435 } 3436 } 3437 3438 InitializedEntity MemberEntity = 3439 InitializedEntity::InitializeMember(*FI, 0); 3440 InitializationKind Kind = 3441 InitializationKind::CreateDirect(Loc, Loc, Loc); 3442 3443 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3444 3445 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3446 return true; 3447 } 3448 3449 if (Union && AllConst) 3450 return true; 3451 3452 return false; 3453} 3454 3455bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3456 CXXRecordDecl *RD = CD->getParent(); 3457 assert(!RD->isDependentType() && "do deletion after instantiation"); 3458 if (!LangOpts.CPlusPlus0x) 3459 return false; 3460 3461 SourceLocation Loc = CD->getLocation(); 3462 3463 // Do access control from the constructor 3464 ContextRAII CtorContext(*this, CD); 3465 3466 bool Union = RD->isUnion(); 3467 3468 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3469 "copy assignment arg has no pointee type"); 3470 bool ConstArg = 3471 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3472 3473 // We do this because we should never actually use an anonymous 3474 // union's constructor. 3475 if (Union && RD->isAnonymousStructOrUnion()) 3476 return false; 3477 3478 // FIXME: We should put some diagnostic logic right into this function. 3479 3480 // C++0x [class.copy]/11 3481 // A defaulted [copy] constructor for class X is defined as delete if X has: 3482 3483 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3484 BE = RD->bases_end(); 3485 BI != BE; ++BI) { 3486 // We'll handle this one later 3487 if (BI->isVirtual()) 3488 continue; 3489 3490 QualType BaseType = BI->getType(); 3491 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3492 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3493 3494 // -- any [direct base class] of a type with a destructor that is deleted or 3495 // inaccessible from the defaulted constructor 3496 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3497 if (BaseDtor->isDeleted()) 3498 return true; 3499 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3500 AR_accessible) 3501 return true; 3502 3503 // -- a [direct base class] B that cannot be [copied] because overload 3504 // resolution, as applied to B's [copy] constructor, results in an 3505 // ambiguity or a function that is deleted or inaccessible from the 3506 // defaulted constructor 3507 InitializedEntity BaseEntity = 3508 InitializedEntity::InitializeBase(Context, BI, 0); 3509 InitializationKind Kind = 3510 InitializationKind::CreateDirect(Loc, Loc, Loc); 3511 3512 // Construct a fake expression to perform the copy overloading. 3513 QualType ArgType = BaseType.getUnqualifiedType(); 3514 if (ConstArg) 3515 ArgType.addConst(); 3516 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3517 3518 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3519 3520 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3521 return true; 3522 } 3523 3524 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3525 BE = RD->vbases_end(); 3526 BI != BE; ++BI) { 3527 QualType BaseType = BI->getType(); 3528 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3529 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3530 3531 // -- any [direct base class] of a type with a destructor that is deleted or 3532 // inaccessible from the defaulted constructor 3533 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3534 if (BaseDtor->isDeleted()) 3535 return true; 3536 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3537 AR_accessible) 3538 return true; 3539 3540 // -- a [virtual base class] B that cannot be [copied] because overload 3541 // resolution, as applied to B's [copy] constructor, results in an 3542 // ambiguity or a function that is deleted or inaccessible from the 3543 // defaulted constructor 3544 InitializedEntity BaseEntity = 3545 InitializedEntity::InitializeBase(Context, BI, BI); 3546 InitializationKind Kind = 3547 InitializationKind::CreateDirect(Loc, Loc, Loc); 3548 3549 // Construct a fake expression to perform the copy overloading. 3550 QualType ArgType = BaseType.getUnqualifiedType(); 3551 if (ConstArg) 3552 ArgType.addConst(); 3553 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3554 3555 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3556 3557 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3558 return true; 3559 } 3560 3561 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3562 FE = RD->field_end(); 3563 FI != FE; ++FI) { 3564 QualType FieldType = Context.getBaseElementType(FI->getType()); 3565 3566 // -- for a copy constructor, a non-static data member of rvalue reference 3567 // type 3568 if (FieldType->isRValueReferenceType()) 3569 return true; 3570 3571 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3572 3573 if (FieldRecord) { 3574 // This is an anonymous union 3575 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3576 // Anonymous unions inside unions do not variant members create 3577 if (!Union) { 3578 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3579 UE = FieldRecord->field_end(); 3580 UI != UE; ++UI) { 3581 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3582 CXXRecordDecl *UnionFieldRecord = 3583 UnionFieldType->getAsCXXRecordDecl(); 3584 3585 // -- a variant member with a non-trivial [copy] constructor and X 3586 // is a union-like class 3587 if (UnionFieldRecord && 3588 !UnionFieldRecord->hasTrivialCopyConstructor()) 3589 return true; 3590 } 3591 } 3592 3593 // Don't try to initalize an anonymous union 3594 continue; 3595 } else { 3596 // -- a variant member with a non-trivial [copy] constructor and X is a 3597 // union-like class 3598 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3599 return true; 3600 3601 // -- any [non-static data member] of a type with a destructor that is 3602 // deleted or inaccessible from the defaulted constructor 3603 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3604 if (FieldDtor->isDeleted()) 3605 return true; 3606 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3607 AR_accessible) 3608 return true; 3609 } 3610 } 3611 3612 llvm::SmallVector<InitializedEntity, 4> Entities; 3613 QualType CurType = FI->getType(); 3614 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3615 while (CurType->isArrayType()) { 3616 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3617 Entities.back())); 3618 CurType = Context.getAsArrayType(CurType)->getElementType(); 3619 } 3620 3621 InitializationKind Kind = 3622 InitializationKind::CreateDirect(Loc, Loc, Loc); 3623 3624 // Construct a fake expression to perform the copy overloading. 3625 QualType ArgType = FieldType; 3626 if (ArgType->isReferenceType()) 3627 ArgType = ArgType->getPointeeType(); 3628 else if (ConstArg) 3629 ArgType.addConst(); 3630 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3631 3632 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3633 3634 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3635 return true; 3636 } 3637 3638 return false; 3639} 3640 3641bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3642 CXXRecordDecl *RD = MD->getParent(); 3643 assert(!RD->isDependentType() && "do deletion after instantiation"); 3644 if (!LangOpts.CPlusPlus0x) 3645 return false; 3646 3647 SourceLocation Loc = MD->getLocation(); 3648 3649 // Do access control from the constructor 3650 ContextRAII MethodContext(*this, MD); 3651 3652 bool Union = RD->isUnion(); 3653 3654 bool ConstArg = 3655 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3656 3657 // We do this because we should never actually use an anonymous 3658 // union's constructor. 3659 if (Union && RD->isAnonymousStructOrUnion()) 3660 return false; 3661 3662 DeclarationName OperatorName = 3663 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3664 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3665 R.suppressDiagnostics(); 3666 3667 // FIXME: We should put some diagnostic logic right into this function. 3668 3669 // C++0x [class.copy]/11 3670 // A defaulted [copy] assignment operator for class X is defined as deleted 3671 // if X has: 3672 3673 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3674 BE = RD->bases_end(); 3675 BI != BE; ++BI) { 3676 // We'll handle this one later 3677 if (BI->isVirtual()) 3678 continue; 3679 3680 QualType BaseType = BI->getType(); 3681 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3682 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3683 3684 // -- a [direct base class] B that cannot be [copied] because overload 3685 // resolution, as applied to B's [copy] assignment operator, results in 3686 // an ambiguity or a function that is deleted or inaccessible from the 3687 // assignment operator 3688 3689 LookupQualifiedName(R, BaseDecl, false); 3690 3691 // Filter out any result that isn't a copy-assignment operator. 3692 LookupResult::Filter F = R.makeFilter(); 3693 while (F.hasNext()) { 3694 NamedDecl *D = F.next(); 3695 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3696 if (Method->isCopyAssignmentOperator()) 3697 continue; 3698 3699 F.erase(); 3700 } 3701 F.done(); 3702 3703 // Build a fake argument expression 3704 QualType ArgType = BaseType; 3705 QualType ThisType = BaseType; 3706 if (ConstArg) 3707 ArgType.addConst(); 3708 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3709 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3710 }; 3711 3712 OverloadCandidateSet OCS((Loc)); 3713 OverloadCandidateSet::iterator Best; 3714 3715 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3716 3717 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3718 OR_Success) 3719 return true; 3720 } 3721 3722 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3723 BE = RD->vbases_end(); 3724 BI != BE; ++BI) { 3725 QualType BaseType = BI->getType(); 3726 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3727 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3728 3729 // -- a [virtual base class] B that cannot be [copied] because overload 3730 // resolution, as applied to B's [copy] assignment operator, results in 3731 // an ambiguity or a function that is deleted or inaccessible from the 3732 // assignment operator 3733 3734 LookupQualifiedName(R, BaseDecl, false); 3735 3736 // Filter out any result that isn't a copy-assignment operator. 3737 LookupResult::Filter F = R.makeFilter(); 3738 while (F.hasNext()) { 3739 NamedDecl *D = F.next(); 3740 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3741 if (Method->isCopyAssignmentOperator()) 3742 continue; 3743 3744 F.erase(); 3745 } 3746 F.done(); 3747 3748 // Build a fake argument expression 3749 QualType ArgType = BaseType; 3750 QualType ThisType = BaseType; 3751 if (ConstArg) 3752 ArgType.addConst(); 3753 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3754 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3755 }; 3756 3757 OverloadCandidateSet OCS((Loc)); 3758 OverloadCandidateSet::iterator Best; 3759 3760 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3761 3762 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3763 OR_Success) 3764 return true; 3765 } 3766 3767 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3768 FE = RD->field_end(); 3769 FI != FE; ++FI) { 3770 QualType FieldType = Context.getBaseElementType(FI->getType()); 3771 3772 // -- a non-static data member of reference type 3773 if (FieldType->isReferenceType()) 3774 return true; 3775 3776 // -- a non-static data member of const non-class type (or array thereof) 3777 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3778 return true; 3779 3780 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3781 3782 if (FieldRecord) { 3783 // This is an anonymous union 3784 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3785 // Anonymous unions inside unions do not variant members create 3786 if (!Union) { 3787 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3788 UE = FieldRecord->field_end(); 3789 UI != UE; ++UI) { 3790 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3791 CXXRecordDecl *UnionFieldRecord = 3792 UnionFieldType->getAsCXXRecordDecl(); 3793 3794 // -- a variant member with a non-trivial [copy] assignment operator 3795 // and X is a union-like class 3796 if (UnionFieldRecord && 3797 !UnionFieldRecord->hasTrivialCopyAssignment()) 3798 return true; 3799 } 3800 } 3801 3802 // Don't try to initalize an anonymous union 3803 continue; 3804 // -- a variant member with a non-trivial [copy] assignment operator 3805 // and X is a union-like class 3806 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3807 return true; 3808 } 3809 3810 LookupQualifiedName(R, FieldRecord, false); 3811 3812 // Filter out any result that isn't a copy-assignment operator. 3813 LookupResult::Filter F = R.makeFilter(); 3814 while (F.hasNext()) { 3815 NamedDecl *D = F.next(); 3816 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3817 if (Method->isCopyAssignmentOperator()) 3818 continue; 3819 3820 F.erase(); 3821 } 3822 F.done(); 3823 3824 // Build a fake argument expression 3825 QualType ArgType = FieldType; 3826 QualType ThisType = FieldType; 3827 if (ConstArg) 3828 ArgType.addConst(); 3829 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3830 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3831 }; 3832 3833 OverloadCandidateSet OCS((Loc)); 3834 OverloadCandidateSet::iterator Best; 3835 3836 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3837 3838 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3839 OR_Success) 3840 return true; 3841 } 3842 } 3843 3844 return false; 3845} 3846 3847bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3848 CXXRecordDecl *RD = DD->getParent(); 3849 assert(!RD->isDependentType() && "do deletion after instantiation"); 3850 if (!LangOpts.CPlusPlus0x) 3851 return false; 3852 3853 SourceLocation Loc = DD->getLocation(); 3854 3855 // Do access control from the destructor 3856 ContextRAII CtorContext(*this, DD); 3857 3858 bool Union = RD->isUnion(); 3859 3860 // We do this because we should never actually use an anonymous 3861 // union's destructor. 3862 if (Union && RD->isAnonymousStructOrUnion()) 3863 return false; 3864 3865 // C++0x [class.dtor]p5 3866 // A defaulted destructor for a class X is defined as deleted if: 3867 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3868 BE = RD->bases_end(); 3869 BI != BE; ++BI) { 3870 // We'll handle this one later 3871 if (BI->isVirtual()) 3872 continue; 3873 3874 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3875 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3876 assert(BaseDtor && "base has no destructor"); 3877 3878 // -- any direct or virtual base class has a deleted destructor or 3879 // a destructor that is inaccessible from the defaulted destructor 3880 if (BaseDtor->isDeleted()) 3881 return true; 3882 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3883 AR_accessible) 3884 return true; 3885 } 3886 3887 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3888 BE = RD->vbases_end(); 3889 BI != BE; ++BI) { 3890 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3891 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3892 assert(BaseDtor && "base has no destructor"); 3893 3894 // -- any direct or virtual base class has a deleted destructor or 3895 // a destructor that is inaccessible from the defaulted destructor 3896 if (BaseDtor->isDeleted()) 3897 return true; 3898 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3899 AR_accessible) 3900 return true; 3901 } 3902 3903 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3904 FE = RD->field_end(); 3905 FI != FE; ++FI) { 3906 QualType FieldType = Context.getBaseElementType(FI->getType()); 3907 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3908 if (FieldRecord) { 3909 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3910 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3911 UE = FieldRecord->field_end(); 3912 UI != UE; ++UI) { 3913 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3914 CXXRecordDecl *UnionFieldRecord = 3915 UnionFieldType->getAsCXXRecordDecl(); 3916 3917 // -- X is a union-like class that has a variant member with a non- 3918 // trivial destructor. 3919 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3920 return true; 3921 } 3922 // Technically we are supposed to do this next check unconditionally. 3923 // But that makes absolutely no sense. 3924 } else { 3925 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3926 3927 // -- any of the non-static data members has class type M (or array 3928 // thereof) and M has a deleted destructor or a destructor that is 3929 // inaccessible from the defaulted destructor 3930 if (FieldDtor->isDeleted()) 3931 return true; 3932 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3933 AR_accessible) 3934 return true; 3935 3936 // -- X is a union-like class that has a variant member with a non- 3937 // trivial destructor. 3938 if (Union && !FieldDtor->isTrivial()) 3939 return true; 3940 } 3941 } 3942 } 3943 3944 if (DD->isVirtual()) { 3945 FunctionDecl *OperatorDelete = 0; 3946 DeclarationName Name = 3947 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3948 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3949 false)) 3950 return true; 3951 } 3952 3953 3954 return false; 3955} 3956 3957/// \brief Data used with FindHiddenVirtualMethod 3958namespace { 3959 struct FindHiddenVirtualMethodData { 3960 Sema *S; 3961 CXXMethodDecl *Method; 3962 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3963 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3964 }; 3965} 3966 3967/// \brief Member lookup function that determines whether a given C++ 3968/// method overloads virtual methods in a base class without overriding any, 3969/// to be used with CXXRecordDecl::lookupInBases(). 3970static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3971 CXXBasePath &Path, 3972 void *UserData) { 3973 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3974 3975 FindHiddenVirtualMethodData &Data 3976 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3977 3978 DeclarationName Name = Data.Method->getDeclName(); 3979 assert(Name.getNameKind() == DeclarationName::Identifier); 3980 3981 bool foundSameNameMethod = false; 3982 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3983 for (Path.Decls = BaseRecord->lookup(Name); 3984 Path.Decls.first != Path.Decls.second; 3985 ++Path.Decls.first) { 3986 NamedDecl *D = *Path.Decls.first; 3987 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3988 MD = MD->getCanonicalDecl(); 3989 foundSameNameMethod = true; 3990 // Interested only in hidden virtual methods. 3991 if (!MD->isVirtual()) 3992 continue; 3993 // If the method we are checking overrides a method from its base 3994 // don't warn about the other overloaded methods. 3995 if (!Data.S->IsOverload(Data.Method, MD, false)) 3996 return true; 3997 // Collect the overload only if its hidden. 3998 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3999 overloadedMethods.push_back(MD); 4000 } 4001 } 4002 4003 if (foundSameNameMethod) 4004 Data.OverloadedMethods.append(overloadedMethods.begin(), 4005 overloadedMethods.end()); 4006 return foundSameNameMethod; 4007} 4008 4009/// \brief See if a method overloads virtual methods in a base class without 4010/// overriding any. 4011void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4012 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4013 MD->getLocation()) == Diagnostic::Ignored) 4014 return; 4015 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4016 return; 4017 4018 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4019 /*bool RecordPaths=*/false, 4020 /*bool DetectVirtual=*/false); 4021 FindHiddenVirtualMethodData Data; 4022 Data.Method = MD; 4023 Data.S = this; 4024 4025 // Keep the base methods that were overriden or introduced in the subclass 4026 // by 'using' in a set. A base method not in this set is hidden. 4027 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4028 res.first != res.second; ++res.first) { 4029 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4030 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4031 E = MD->end_overridden_methods(); 4032 I != E; ++I) 4033 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4034 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4035 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4036 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4037 } 4038 4039 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4040 !Data.OverloadedMethods.empty()) { 4041 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4042 << MD << (Data.OverloadedMethods.size() > 1); 4043 4044 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4045 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4046 Diag(overloadedMD->getLocation(), 4047 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4048 } 4049 } 4050} 4051 4052void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4053 Decl *TagDecl, 4054 SourceLocation LBrac, 4055 SourceLocation RBrac, 4056 AttributeList *AttrList) { 4057 if (!TagDecl) 4058 return; 4059 4060 AdjustDeclIfTemplate(TagDecl); 4061 4062 ActOnFields(S, RLoc, TagDecl, 4063 // strict aliasing violation! 4064 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4065 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4066 4067 CheckCompletedCXXClass( 4068 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4069} 4070 4071/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4072/// special functions, such as the default constructor, copy 4073/// constructor, or destructor, to the given C++ class (C++ 4074/// [special]p1). This routine can only be executed just before the 4075/// definition of the class is complete. 4076void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4077 if (!ClassDecl->hasUserDeclaredConstructor()) 4078 ++ASTContext::NumImplicitDefaultConstructors; 4079 4080 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4081 ++ASTContext::NumImplicitCopyConstructors; 4082 4083 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4084 ++ASTContext::NumImplicitCopyAssignmentOperators; 4085 4086 // If we have a dynamic class, then the copy assignment operator may be 4087 // virtual, so we have to declare it immediately. This ensures that, e.g., 4088 // it shows up in the right place in the vtable and that we diagnose 4089 // problems with the implicit exception specification. 4090 if (ClassDecl->isDynamicClass()) 4091 DeclareImplicitCopyAssignment(ClassDecl); 4092 } 4093 4094 if (!ClassDecl->hasUserDeclaredDestructor()) { 4095 ++ASTContext::NumImplicitDestructors; 4096 4097 // If we have a dynamic class, then the destructor may be virtual, so we 4098 // have to declare the destructor immediately. This ensures that, e.g., it 4099 // shows up in the right place in the vtable and that we diagnose problems 4100 // with the implicit exception specification. 4101 if (ClassDecl->isDynamicClass()) 4102 DeclareImplicitDestructor(ClassDecl); 4103 } 4104} 4105 4106void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4107 if (!D) 4108 return; 4109 4110 int NumParamList = D->getNumTemplateParameterLists(); 4111 for (int i = 0; i < NumParamList; i++) { 4112 TemplateParameterList* Params = D->getTemplateParameterList(i); 4113 for (TemplateParameterList::iterator Param = Params->begin(), 4114 ParamEnd = Params->end(); 4115 Param != ParamEnd; ++Param) { 4116 NamedDecl *Named = cast<NamedDecl>(*Param); 4117 if (Named->getDeclName()) { 4118 S->AddDecl(Named); 4119 IdResolver.AddDecl(Named); 4120 } 4121 } 4122 } 4123} 4124 4125void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4126 if (!D) 4127 return; 4128 4129 TemplateParameterList *Params = 0; 4130 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4131 Params = Template->getTemplateParameters(); 4132 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4133 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4134 Params = PartialSpec->getTemplateParameters(); 4135 else 4136 return; 4137 4138 for (TemplateParameterList::iterator Param = Params->begin(), 4139 ParamEnd = Params->end(); 4140 Param != ParamEnd; ++Param) { 4141 NamedDecl *Named = cast<NamedDecl>(*Param); 4142 if (Named->getDeclName()) { 4143 S->AddDecl(Named); 4144 IdResolver.AddDecl(Named); 4145 } 4146 } 4147} 4148 4149void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4150 if (!RecordD) return; 4151 AdjustDeclIfTemplate(RecordD); 4152 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4153 PushDeclContext(S, Record); 4154} 4155 4156void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4157 if (!RecordD) return; 4158 PopDeclContext(); 4159} 4160 4161/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4162/// parsing a top-level (non-nested) C++ class, and we are now 4163/// parsing those parts of the given Method declaration that could 4164/// not be parsed earlier (C++ [class.mem]p2), such as default 4165/// arguments. This action should enter the scope of the given 4166/// Method declaration as if we had just parsed the qualified method 4167/// name. However, it should not bring the parameters into scope; 4168/// that will be performed by ActOnDelayedCXXMethodParameter. 4169void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4170} 4171 4172/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4173/// C++ method declaration. We're (re-)introducing the given 4174/// function parameter into scope for use in parsing later parts of 4175/// the method declaration. For example, we could see an 4176/// ActOnParamDefaultArgument event for this parameter. 4177void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4178 if (!ParamD) 4179 return; 4180 4181 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4182 4183 // If this parameter has an unparsed default argument, clear it out 4184 // to make way for the parsed default argument. 4185 if (Param->hasUnparsedDefaultArg()) 4186 Param->setDefaultArg(0); 4187 4188 S->AddDecl(Param); 4189 if (Param->getDeclName()) 4190 IdResolver.AddDecl(Param); 4191} 4192 4193/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4194/// processing the delayed method declaration for Method. The method 4195/// declaration is now considered finished. There may be a separate 4196/// ActOnStartOfFunctionDef action later (not necessarily 4197/// immediately!) for this method, if it was also defined inside the 4198/// class body. 4199void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4200 if (!MethodD) 4201 return; 4202 4203 AdjustDeclIfTemplate(MethodD); 4204 4205 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4206 4207 // Now that we have our default arguments, check the constructor 4208 // again. It could produce additional diagnostics or affect whether 4209 // the class has implicitly-declared destructors, among other 4210 // things. 4211 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4212 CheckConstructor(Constructor); 4213 4214 // Check the default arguments, which we may have added. 4215 if (!Method->isInvalidDecl()) 4216 CheckCXXDefaultArguments(Method); 4217} 4218 4219/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4220/// the well-formedness of the constructor declarator @p D with type @p 4221/// R. If there are any errors in the declarator, this routine will 4222/// emit diagnostics and set the invalid bit to true. In any case, the type 4223/// will be updated to reflect a well-formed type for the constructor and 4224/// returned. 4225QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4226 StorageClass &SC) { 4227 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4228 4229 // C++ [class.ctor]p3: 4230 // A constructor shall not be virtual (10.3) or static (9.4). A 4231 // constructor can be invoked for a const, volatile or const 4232 // volatile object. A constructor shall not be declared const, 4233 // volatile, or const volatile (9.3.2). 4234 if (isVirtual) { 4235 if (!D.isInvalidType()) 4236 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4237 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4238 << SourceRange(D.getIdentifierLoc()); 4239 D.setInvalidType(); 4240 } 4241 if (SC == SC_Static) { 4242 if (!D.isInvalidType()) 4243 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4244 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4245 << SourceRange(D.getIdentifierLoc()); 4246 D.setInvalidType(); 4247 SC = SC_None; 4248 } 4249 4250 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4251 if (FTI.TypeQuals != 0) { 4252 if (FTI.TypeQuals & Qualifiers::Const) 4253 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4254 << "const" << SourceRange(D.getIdentifierLoc()); 4255 if (FTI.TypeQuals & Qualifiers::Volatile) 4256 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4257 << "volatile" << SourceRange(D.getIdentifierLoc()); 4258 if (FTI.TypeQuals & Qualifiers::Restrict) 4259 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4260 << "restrict" << SourceRange(D.getIdentifierLoc()); 4261 D.setInvalidType(); 4262 } 4263 4264 // C++0x [class.ctor]p4: 4265 // A constructor shall not be declared with a ref-qualifier. 4266 if (FTI.hasRefQualifier()) { 4267 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4268 << FTI.RefQualifierIsLValueRef 4269 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4270 D.setInvalidType(); 4271 } 4272 4273 // Rebuild the function type "R" without any type qualifiers (in 4274 // case any of the errors above fired) and with "void" as the 4275 // return type, since constructors don't have return types. 4276 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4277 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4278 return R; 4279 4280 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4281 EPI.TypeQuals = 0; 4282 EPI.RefQualifier = RQ_None; 4283 4284 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4285 Proto->getNumArgs(), EPI); 4286} 4287 4288/// CheckConstructor - Checks a fully-formed constructor for 4289/// well-formedness, issuing any diagnostics required. Returns true if 4290/// the constructor declarator is invalid. 4291void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4292 CXXRecordDecl *ClassDecl 4293 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4294 if (!ClassDecl) 4295 return Constructor->setInvalidDecl(); 4296 4297 // C++ [class.copy]p3: 4298 // A declaration of a constructor for a class X is ill-formed if 4299 // its first parameter is of type (optionally cv-qualified) X and 4300 // either there are no other parameters or else all other 4301 // parameters have default arguments. 4302 if (!Constructor->isInvalidDecl() && 4303 ((Constructor->getNumParams() == 1) || 4304 (Constructor->getNumParams() > 1 && 4305 Constructor->getParamDecl(1)->hasDefaultArg())) && 4306 Constructor->getTemplateSpecializationKind() 4307 != TSK_ImplicitInstantiation) { 4308 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4309 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4310 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4311 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4312 const char *ConstRef 4313 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4314 : " const &"; 4315 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4316 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4317 4318 // FIXME: Rather that making the constructor invalid, we should endeavor 4319 // to fix the type. 4320 Constructor->setInvalidDecl(); 4321 } 4322 } 4323} 4324 4325/// CheckDestructor - Checks a fully-formed destructor definition for 4326/// well-formedness, issuing any diagnostics required. Returns true 4327/// on error. 4328bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4329 CXXRecordDecl *RD = Destructor->getParent(); 4330 4331 if (Destructor->isVirtual()) { 4332 SourceLocation Loc; 4333 4334 if (!Destructor->isImplicit()) 4335 Loc = Destructor->getLocation(); 4336 else 4337 Loc = RD->getLocation(); 4338 4339 // If we have a virtual destructor, look up the deallocation function 4340 FunctionDecl *OperatorDelete = 0; 4341 DeclarationName Name = 4342 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4343 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4344 return true; 4345 4346 MarkDeclarationReferenced(Loc, OperatorDelete); 4347 4348 Destructor->setOperatorDelete(OperatorDelete); 4349 } 4350 4351 return false; 4352} 4353 4354static inline bool 4355FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4356 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4357 FTI.ArgInfo[0].Param && 4358 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4359} 4360 4361/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4362/// the well-formednes of the destructor declarator @p D with type @p 4363/// R. If there are any errors in the declarator, this routine will 4364/// emit diagnostics and set the declarator to invalid. Even if this happens, 4365/// will be updated to reflect a well-formed type for the destructor and 4366/// returned. 4367QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4368 StorageClass& SC) { 4369 // C++ [class.dtor]p1: 4370 // [...] A typedef-name that names a class is a class-name 4371 // (7.1.3); however, a typedef-name that names a class shall not 4372 // be used as the identifier in the declarator for a destructor 4373 // declaration. 4374 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4375 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4376 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4377 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4378 else if (const TemplateSpecializationType *TST = 4379 DeclaratorType->getAs<TemplateSpecializationType>()) 4380 if (TST->isTypeAlias()) 4381 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4382 << DeclaratorType << 1; 4383 4384 // C++ [class.dtor]p2: 4385 // A destructor is used to destroy objects of its class type. A 4386 // destructor takes no parameters, and no return type can be 4387 // specified for it (not even void). The address of a destructor 4388 // shall not be taken. A destructor shall not be static. A 4389 // destructor can be invoked for a const, volatile or const 4390 // volatile object. A destructor shall not be declared const, 4391 // volatile or const volatile (9.3.2). 4392 if (SC == SC_Static) { 4393 if (!D.isInvalidType()) 4394 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4395 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4396 << SourceRange(D.getIdentifierLoc()) 4397 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4398 4399 SC = SC_None; 4400 } 4401 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4402 // Destructors don't have return types, but the parser will 4403 // happily parse something like: 4404 // 4405 // class X { 4406 // float ~X(); 4407 // }; 4408 // 4409 // The return type will be eliminated later. 4410 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4411 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4412 << SourceRange(D.getIdentifierLoc()); 4413 } 4414 4415 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4416 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4417 if (FTI.TypeQuals & Qualifiers::Const) 4418 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4419 << "const" << SourceRange(D.getIdentifierLoc()); 4420 if (FTI.TypeQuals & Qualifiers::Volatile) 4421 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4422 << "volatile" << SourceRange(D.getIdentifierLoc()); 4423 if (FTI.TypeQuals & Qualifiers::Restrict) 4424 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4425 << "restrict" << SourceRange(D.getIdentifierLoc()); 4426 D.setInvalidType(); 4427 } 4428 4429 // C++0x [class.dtor]p2: 4430 // A destructor shall not be declared with a ref-qualifier. 4431 if (FTI.hasRefQualifier()) { 4432 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4433 << FTI.RefQualifierIsLValueRef 4434 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4435 D.setInvalidType(); 4436 } 4437 4438 // Make sure we don't have any parameters. 4439 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4440 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4441 4442 // Delete the parameters. 4443 FTI.freeArgs(); 4444 D.setInvalidType(); 4445 } 4446 4447 // Make sure the destructor isn't variadic. 4448 if (FTI.isVariadic) { 4449 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4450 D.setInvalidType(); 4451 } 4452 4453 // Rebuild the function type "R" without any type qualifiers or 4454 // parameters (in case any of the errors above fired) and with 4455 // "void" as the return type, since destructors don't have return 4456 // types. 4457 if (!D.isInvalidType()) 4458 return R; 4459 4460 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4461 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4462 EPI.Variadic = false; 4463 EPI.TypeQuals = 0; 4464 EPI.RefQualifier = RQ_None; 4465 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4466} 4467 4468/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4469/// well-formednes of the conversion function declarator @p D with 4470/// type @p R. If there are any errors in the declarator, this routine 4471/// will emit diagnostics and return true. Otherwise, it will return 4472/// false. Either way, the type @p R will be updated to reflect a 4473/// well-formed type for the conversion operator. 4474void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4475 StorageClass& SC) { 4476 // C++ [class.conv.fct]p1: 4477 // Neither parameter types nor return type can be specified. The 4478 // type of a conversion function (8.3.5) is "function taking no 4479 // parameter returning conversion-type-id." 4480 if (SC == SC_Static) { 4481 if (!D.isInvalidType()) 4482 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4483 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4484 << SourceRange(D.getIdentifierLoc()); 4485 D.setInvalidType(); 4486 SC = SC_None; 4487 } 4488 4489 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4490 4491 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4492 // Conversion functions don't have return types, but the parser will 4493 // happily parse something like: 4494 // 4495 // class X { 4496 // float operator bool(); 4497 // }; 4498 // 4499 // The return type will be changed later anyway. 4500 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4501 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4502 << SourceRange(D.getIdentifierLoc()); 4503 D.setInvalidType(); 4504 } 4505 4506 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4507 4508 // Make sure we don't have any parameters. 4509 if (Proto->getNumArgs() > 0) { 4510 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4511 4512 // Delete the parameters. 4513 D.getFunctionTypeInfo().freeArgs(); 4514 D.setInvalidType(); 4515 } else if (Proto->isVariadic()) { 4516 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4517 D.setInvalidType(); 4518 } 4519 4520 // Diagnose "&operator bool()" and other such nonsense. This 4521 // is actually a gcc extension which we don't support. 4522 if (Proto->getResultType() != ConvType) { 4523 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4524 << Proto->getResultType(); 4525 D.setInvalidType(); 4526 ConvType = Proto->getResultType(); 4527 } 4528 4529 // C++ [class.conv.fct]p4: 4530 // The conversion-type-id shall not represent a function type nor 4531 // an array type. 4532 if (ConvType->isArrayType()) { 4533 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4534 ConvType = Context.getPointerType(ConvType); 4535 D.setInvalidType(); 4536 } else if (ConvType->isFunctionType()) { 4537 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4538 ConvType = Context.getPointerType(ConvType); 4539 D.setInvalidType(); 4540 } 4541 4542 // Rebuild the function type "R" without any parameters (in case any 4543 // of the errors above fired) and with the conversion type as the 4544 // return type. 4545 if (D.isInvalidType()) 4546 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4547 4548 // C++0x explicit conversion operators. 4549 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4550 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4551 diag::warn_explicit_conversion_functions) 4552 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4553} 4554 4555/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4556/// the declaration of the given C++ conversion function. This routine 4557/// is responsible for recording the conversion function in the C++ 4558/// class, if possible. 4559Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4560 assert(Conversion && "Expected to receive a conversion function declaration"); 4561 4562 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4563 4564 // Make sure we aren't redeclaring the conversion function. 4565 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4566 4567 // C++ [class.conv.fct]p1: 4568 // [...] A conversion function is never used to convert a 4569 // (possibly cv-qualified) object to the (possibly cv-qualified) 4570 // same object type (or a reference to it), to a (possibly 4571 // cv-qualified) base class of that type (or a reference to it), 4572 // or to (possibly cv-qualified) void. 4573 // FIXME: Suppress this warning if the conversion function ends up being a 4574 // virtual function that overrides a virtual function in a base class. 4575 QualType ClassType 4576 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4577 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4578 ConvType = ConvTypeRef->getPointeeType(); 4579 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4580 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4581 /* Suppress diagnostics for instantiations. */; 4582 else if (ConvType->isRecordType()) { 4583 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4584 if (ConvType == ClassType) 4585 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4586 << ClassType; 4587 else if (IsDerivedFrom(ClassType, ConvType)) 4588 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4589 << ClassType << ConvType; 4590 } else if (ConvType->isVoidType()) { 4591 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4592 << ClassType << ConvType; 4593 } 4594 4595 if (FunctionTemplateDecl *ConversionTemplate 4596 = Conversion->getDescribedFunctionTemplate()) 4597 return ConversionTemplate; 4598 4599 return Conversion; 4600} 4601 4602//===----------------------------------------------------------------------===// 4603// Namespace Handling 4604//===----------------------------------------------------------------------===// 4605 4606 4607 4608/// ActOnStartNamespaceDef - This is called at the start of a namespace 4609/// definition. 4610Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4611 SourceLocation InlineLoc, 4612 SourceLocation NamespaceLoc, 4613 SourceLocation IdentLoc, 4614 IdentifierInfo *II, 4615 SourceLocation LBrace, 4616 AttributeList *AttrList) { 4617 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4618 // For anonymous namespace, take the location of the left brace. 4619 SourceLocation Loc = II ? IdentLoc : LBrace; 4620 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4621 StartLoc, Loc, II); 4622 Namespc->setInline(InlineLoc.isValid()); 4623 4624 Scope *DeclRegionScope = NamespcScope->getParent(); 4625 4626 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4627 4628 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4629 PushNamespaceVisibilityAttr(Attr); 4630 4631 if (II) { 4632 // C++ [namespace.def]p2: 4633 // The identifier in an original-namespace-definition shall not 4634 // have been previously defined in the declarative region in 4635 // which the original-namespace-definition appears. The 4636 // identifier in an original-namespace-definition is the name of 4637 // the namespace. Subsequently in that declarative region, it is 4638 // treated as an original-namespace-name. 4639 // 4640 // Since namespace names are unique in their scope, and we don't 4641 // look through using directives, just look for any ordinary names. 4642 4643 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4644 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4645 Decl::IDNS_Namespace; 4646 NamedDecl *PrevDecl = 0; 4647 for (DeclContext::lookup_result R 4648 = CurContext->getRedeclContext()->lookup(II); 4649 R.first != R.second; ++R.first) { 4650 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4651 PrevDecl = *R.first; 4652 break; 4653 } 4654 } 4655 4656 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4657 // This is an extended namespace definition. 4658 if (Namespc->isInline() != OrigNS->isInline()) { 4659 // inline-ness must match 4660 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4661 << Namespc->isInline(); 4662 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4663 Namespc->setInvalidDecl(); 4664 // Recover by ignoring the new namespace's inline status. 4665 Namespc->setInline(OrigNS->isInline()); 4666 } 4667 4668 // Attach this namespace decl to the chain of extended namespace 4669 // definitions. 4670 OrigNS->setNextNamespace(Namespc); 4671 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4672 4673 // Remove the previous declaration from the scope. 4674 if (DeclRegionScope->isDeclScope(OrigNS)) { 4675 IdResolver.RemoveDecl(OrigNS); 4676 DeclRegionScope->RemoveDecl(OrigNS); 4677 } 4678 } else if (PrevDecl) { 4679 // This is an invalid name redefinition. 4680 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4681 << Namespc->getDeclName(); 4682 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4683 Namespc->setInvalidDecl(); 4684 // Continue on to push Namespc as current DeclContext and return it. 4685 } else if (II->isStr("std") && 4686 CurContext->getRedeclContext()->isTranslationUnit()) { 4687 // This is the first "real" definition of the namespace "std", so update 4688 // our cache of the "std" namespace to point at this definition. 4689 if (NamespaceDecl *StdNS = getStdNamespace()) { 4690 // We had already defined a dummy namespace "std". Link this new 4691 // namespace definition to the dummy namespace "std". 4692 StdNS->setNextNamespace(Namespc); 4693 StdNS->setLocation(IdentLoc); 4694 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4695 } 4696 4697 // Make our StdNamespace cache point at the first real definition of the 4698 // "std" namespace. 4699 StdNamespace = Namespc; 4700 } 4701 4702 PushOnScopeChains(Namespc, DeclRegionScope); 4703 } else { 4704 // Anonymous namespaces. 4705 assert(Namespc->isAnonymousNamespace()); 4706 4707 // Link the anonymous namespace into its parent. 4708 NamespaceDecl *PrevDecl; 4709 DeclContext *Parent = CurContext->getRedeclContext(); 4710 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4711 PrevDecl = TU->getAnonymousNamespace(); 4712 TU->setAnonymousNamespace(Namespc); 4713 } else { 4714 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4715 PrevDecl = ND->getAnonymousNamespace(); 4716 ND->setAnonymousNamespace(Namespc); 4717 } 4718 4719 // Link the anonymous namespace with its previous declaration. 4720 if (PrevDecl) { 4721 assert(PrevDecl->isAnonymousNamespace()); 4722 assert(!PrevDecl->getNextNamespace()); 4723 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4724 PrevDecl->setNextNamespace(Namespc); 4725 4726 if (Namespc->isInline() != PrevDecl->isInline()) { 4727 // inline-ness must match 4728 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4729 << Namespc->isInline(); 4730 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4731 Namespc->setInvalidDecl(); 4732 // Recover by ignoring the new namespace's inline status. 4733 Namespc->setInline(PrevDecl->isInline()); 4734 } 4735 } 4736 4737 CurContext->addDecl(Namespc); 4738 4739 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4740 // behaves as if it were replaced by 4741 // namespace unique { /* empty body */ } 4742 // using namespace unique; 4743 // namespace unique { namespace-body } 4744 // where all occurrences of 'unique' in a translation unit are 4745 // replaced by the same identifier and this identifier differs 4746 // from all other identifiers in the entire program. 4747 4748 // We just create the namespace with an empty name and then add an 4749 // implicit using declaration, just like the standard suggests. 4750 // 4751 // CodeGen enforces the "universally unique" aspect by giving all 4752 // declarations semantically contained within an anonymous 4753 // namespace internal linkage. 4754 4755 if (!PrevDecl) { 4756 UsingDirectiveDecl* UD 4757 = UsingDirectiveDecl::Create(Context, CurContext, 4758 /* 'using' */ LBrace, 4759 /* 'namespace' */ SourceLocation(), 4760 /* qualifier */ NestedNameSpecifierLoc(), 4761 /* identifier */ SourceLocation(), 4762 Namespc, 4763 /* Ancestor */ CurContext); 4764 UD->setImplicit(); 4765 CurContext->addDecl(UD); 4766 } 4767 } 4768 4769 // Although we could have an invalid decl (i.e. the namespace name is a 4770 // redefinition), push it as current DeclContext and try to continue parsing. 4771 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4772 // for the namespace has the declarations that showed up in that particular 4773 // namespace definition. 4774 PushDeclContext(NamespcScope, Namespc); 4775 return Namespc; 4776} 4777 4778/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4779/// is a namespace alias, returns the namespace it points to. 4780static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4781 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4782 return AD->getNamespace(); 4783 return dyn_cast_or_null<NamespaceDecl>(D); 4784} 4785 4786/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4787/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4788void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4789 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4790 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4791 Namespc->setRBraceLoc(RBrace); 4792 PopDeclContext(); 4793 if (Namespc->hasAttr<VisibilityAttr>()) 4794 PopPragmaVisibility(); 4795} 4796 4797CXXRecordDecl *Sema::getStdBadAlloc() const { 4798 return cast_or_null<CXXRecordDecl>( 4799 StdBadAlloc.get(Context.getExternalSource())); 4800} 4801 4802NamespaceDecl *Sema::getStdNamespace() const { 4803 return cast_or_null<NamespaceDecl>( 4804 StdNamespace.get(Context.getExternalSource())); 4805} 4806 4807/// \brief Retrieve the special "std" namespace, which may require us to 4808/// implicitly define the namespace. 4809NamespaceDecl *Sema::getOrCreateStdNamespace() { 4810 if (!StdNamespace) { 4811 // The "std" namespace has not yet been defined, so build one implicitly. 4812 StdNamespace = NamespaceDecl::Create(Context, 4813 Context.getTranslationUnitDecl(), 4814 SourceLocation(), SourceLocation(), 4815 &PP.getIdentifierTable().get("std")); 4816 getStdNamespace()->setImplicit(true); 4817 } 4818 4819 return getStdNamespace(); 4820} 4821 4822/// \brief Determine whether a using statement is in a context where it will be 4823/// apply in all contexts. 4824static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4825 switch (CurContext->getDeclKind()) { 4826 case Decl::TranslationUnit: 4827 return true; 4828 case Decl::LinkageSpec: 4829 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4830 default: 4831 return false; 4832 } 4833} 4834 4835Decl *Sema::ActOnUsingDirective(Scope *S, 4836 SourceLocation UsingLoc, 4837 SourceLocation NamespcLoc, 4838 CXXScopeSpec &SS, 4839 SourceLocation IdentLoc, 4840 IdentifierInfo *NamespcName, 4841 AttributeList *AttrList) { 4842 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4843 assert(NamespcName && "Invalid NamespcName."); 4844 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4845 4846 // This can only happen along a recovery path. 4847 while (S->getFlags() & Scope::TemplateParamScope) 4848 S = S->getParent(); 4849 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4850 4851 UsingDirectiveDecl *UDir = 0; 4852 NestedNameSpecifier *Qualifier = 0; 4853 if (SS.isSet()) 4854 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4855 4856 // Lookup namespace name. 4857 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4858 LookupParsedName(R, S, &SS); 4859 if (R.isAmbiguous()) 4860 return 0; 4861 4862 if (R.empty()) { 4863 // Allow "using namespace std;" or "using namespace ::std;" even if 4864 // "std" hasn't been defined yet, for GCC compatibility. 4865 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4866 NamespcName->isStr("std")) { 4867 Diag(IdentLoc, diag::ext_using_undefined_std); 4868 R.addDecl(getOrCreateStdNamespace()); 4869 R.resolveKind(); 4870 } 4871 // Otherwise, attempt typo correction. 4872 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4873 CTC_NoKeywords, 0)) { 4874 if (R.getAsSingle<NamespaceDecl>() || 4875 R.getAsSingle<NamespaceAliasDecl>()) { 4876 if (DeclContext *DC = computeDeclContext(SS, false)) 4877 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4878 << NamespcName << DC << Corrected << SS.getRange() 4879 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4880 else 4881 Diag(IdentLoc, diag::err_using_directive_suggest) 4882 << NamespcName << Corrected 4883 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4884 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4885 << Corrected; 4886 4887 NamespcName = Corrected.getAsIdentifierInfo(); 4888 } else { 4889 R.clear(); 4890 R.setLookupName(NamespcName); 4891 } 4892 } 4893 } 4894 4895 if (!R.empty()) { 4896 NamedDecl *Named = R.getFoundDecl(); 4897 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4898 && "expected namespace decl"); 4899 // C++ [namespace.udir]p1: 4900 // A using-directive specifies that the names in the nominated 4901 // namespace can be used in the scope in which the 4902 // using-directive appears after the using-directive. During 4903 // unqualified name lookup (3.4.1), the names appear as if they 4904 // were declared in the nearest enclosing namespace which 4905 // contains both the using-directive and the nominated 4906 // namespace. [Note: in this context, "contains" means "contains 4907 // directly or indirectly". ] 4908 4909 // Find enclosing context containing both using-directive and 4910 // nominated namespace. 4911 NamespaceDecl *NS = getNamespaceDecl(Named); 4912 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4913 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4914 CommonAncestor = CommonAncestor->getParent(); 4915 4916 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4917 SS.getWithLocInContext(Context), 4918 IdentLoc, Named, CommonAncestor); 4919 4920 if (IsUsingDirectiveInToplevelContext(CurContext) && 4921 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4922 Diag(IdentLoc, diag::warn_using_directive_in_header); 4923 } 4924 4925 PushUsingDirective(S, UDir); 4926 } else { 4927 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4928 } 4929 4930 // FIXME: We ignore attributes for now. 4931 return UDir; 4932} 4933 4934void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4935 // If scope has associated entity, then using directive is at namespace 4936 // or translation unit scope. We add UsingDirectiveDecls, into 4937 // it's lookup structure. 4938 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4939 Ctx->addDecl(UDir); 4940 else 4941 // Otherwise it is block-sope. using-directives will affect lookup 4942 // only to the end of scope. 4943 S->PushUsingDirective(UDir); 4944} 4945 4946 4947Decl *Sema::ActOnUsingDeclaration(Scope *S, 4948 AccessSpecifier AS, 4949 bool HasUsingKeyword, 4950 SourceLocation UsingLoc, 4951 CXXScopeSpec &SS, 4952 UnqualifiedId &Name, 4953 AttributeList *AttrList, 4954 bool IsTypeName, 4955 SourceLocation TypenameLoc) { 4956 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4957 4958 switch (Name.getKind()) { 4959 case UnqualifiedId::IK_Identifier: 4960 case UnqualifiedId::IK_OperatorFunctionId: 4961 case UnqualifiedId::IK_LiteralOperatorId: 4962 case UnqualifiedId::IK_ConversionFunctionId: 4963 break; 4964 4965 case UnqualifiedId::IK_ConstructorName: 4966 case UnqualifiedId::IK_ConstructorTemplateId: 4967 // C++0x inherited constructors. 4968 if (getLangOptions().CPlusPlus0x) break; 4969 4970 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4971 << SS.getRange(); 4972 return 0; 4973 4974 case UnqualifiedId::IK_DestructorName: 4975 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4976 << SS.getRange(); 4977 return 0; 4978 4979 case UnqualifiedId::IK_TemplateId: 4980 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4981 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4982 return 0; 4983 } 4984 4985 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4986 DeclarationName TargetName = TargetNameInfo.getName(); 4987 if (!TargetName) 4988 return 0; 4989 4990 // Warn about using declarations. 4991 // TODO: store that the declaration was written without 'using' and 4992 // talk about access decls instead of using decls in the 4993 // diagnostics. 4994 if (!HasUsingKeyword) { 4995 UsingLoc = Name.getSourceRange().getBegin(); 4996 4997 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4998 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4999 } 5000 5001 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5002 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5003 return 0; 5004 5005 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5006 TargetNameInfo, AttrList, 5007 /* IsInstantiation */ false, 5008 IsTypeName, TypenameLoc); 5009 if (UD) 5010 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5011 5012 return UD; 5013} 5014 5015/// \brief Determine whether a using declaration considers the given 5016/// declarations as "equivalent", e.g., if they are redeclarations of 5017/// the same entity or are both typedefs of the same type. 5018static bool 5019IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5020 bool &SuppressRedeclaration) { 5021 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5022 SuppressRedeclaration = false; 5023 return true; 5024 } 5025 5026 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5027 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5028 SuppressRedeclaration = true; 5029 return Context.hasSameType(TD1->getUnderlyingType(), 5030 TD2->getUnderlyingType()); 5031 } 5032 5033 return false; 5034} 5035 5036 5037/// Determines whether to create a using shadow decl for a particular 5038/// decl, given the set of decls existing prior to this using lookup. 5039bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5040 const LookupResult &Previous) { 5041 // Diagnose finding a decl which is not from a base class of the 5042 // current class. We do this now because there are cases where this 5043 // function will silently decide not to build a shadow decl, which 5044 // will pre-empt further diagnostics. 5045 // 5046 // We don't need to do this in C++0x because we do the check once on 5047 // the qualifier. 5048 // 5049 // FIXME: diagnose the following if we care enough: 5050 // struct A { int foo; }; 5051 // struct B : A { using A::foo; }; 5052 // template <class T> struct C : A {}; 5053 // template <class T> struct D : C<T> { using B::foo; } // <--- 5054 // This is invalid (during instantiation) in C++03 because B::foo 5055 // resolves to the using decl in B, which is not a base class of D<T>. 5056 // We can't diagnose it immediately because C<T> is an unknown 5057 // specialization. The UsingShadowDecl in D<T> then points directly 5058 // to A::foo, which will look well-formed when we instantiate. 5059 // The right solution is to not collapse the shadow-decl chain. 5060 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5061 DeclContext *OrigDC = Orig->getDeclContext(); 5062 5063 // Handle enums and anonymous structs. 5064 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5065 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5066 while (OrigRec->isAnonymousStructOrUnion()) 5067 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5068 5069 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5070 if (OrigDC == CurContext) { 5071 Diag(Using->getLocation(), 5072 diag::err_using_decl_nested_name_specifier_is_current_class) 5073 << Using->getQualifierLoc().getSourceRange(); 5074 Diag(Orig->getLocation(), diag::note_using_decl_target); 5075 return true; 5076 } 5077 5078 Diag(Using->getQualifierLoc().getBeginLoc(), 5079 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5080 << Using->getQualifier() 5081 << cast<CXXRecordDecl>(CurContext) 5082 << Using->getQualifierLoc().getSourceRange(); 5083 Diag(Orig->getLocation(), diag::note_using_decl_target); 5084 return true; 5085 } 5086 } 5087 5088 if (Previous.empty()) return false; 5089 5090 NamedDecl *Target = Orig; 5091 if (isa<UsingShadowDecl>(Target)) 5092 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5093 5094 // If the target happens to be one of the previous declarations, we 5095 // don't have a conflict. 5096 // 5097 // FIXME: but we might be increasing its access, in which case we 5098 // should redeclare it. 5099 NamedDecl *NonTag = 0, *Tag = 0; 5100 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5101 I != E; ++I) { 5102 NamedDecl *D = (*I)->getUnderlyingDecl(); 5103 bool Result; 5104 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5105 return Result; 5106 5107 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5108 } 5109 5110 if (Target->isFunctionOrFunctionTemplate()) { 5111 FunctionDecl *FD; 5112 if (isa<FunctionTemplateDecl>(Target)) 5113 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5114 else 5115 FD = cast<FunctionDecl>(Target); 5116 5117 NamedDecl *OldDecl = 0; 5118 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5119 case Ovl_Overload: 5120 return false; 5121 5122 case Ovl_NonFunction: 5123 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5124 break; 5125 5126 // We found a decl with the exact signature. 5127 case Ovl_Match: 5128 // If we're in a record, we want to hide the target, so we 5129 // return true (without a diagnostic) to tell the caller not to 5130 // build a shadow decl. 5131 if (CurContext->isRecord()) 5132 return true; 5133 5134 // If we're not in a record, this is an error. 5135 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5136 break; 5137 } 5138 5139 Diag(Target->getLocation(), diag::note_using_decl_target); 5140 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5141 return true; 5142 } 5143 5144 // Target is not a function. 5145 5146 if (isa<TagDecl>(Target)) { 5147 // No conflict between a tag and a non-tag. 5148 if (!Tag) return false; 5149 5150 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5151 Diag(Target->getLocation(), diag::note_using_decl_target); 5152 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5153 return true; 5154 } 5155 5156 // No conflict between a tag and a non-tag. 5157 if (!NonTag) return false; 5158 5159 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5160 Diag(Target->getLocation(), diag::note_using_decl_target); 5161 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5162 return true; 5163} 5164 5165/// Builds a shadow declaration corresponding to a 'using' declaration. 5166UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5167 UsingDecl *UD, 5168 NamedDecl *Orig) { 5169 5170 // If we resolved to another shadow declaration, just coalesce them. 5171 NamedDecl *Target = Orig; 5172 if (isa<UsingShadowDecl>(Target)) { 5173 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5174 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5175 } 5176 5177 UsingShadowDecl *Shadow 5178 = UsingShadowDecl::Create(Context, CurContext, 5179 UD->getLocation(), UD, Target); 5180 UD->addShadowDecl(Shadow); 5181 5182 Shadow->setAccess(UD->getAccess()); 5183 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5184 Shadow->setInvalidDecl(); 5185 5186 if (S) 5187 PushOnScopeChains(Shadow, S); 5188 else 5189 CurContext->addDecl(Shadow); 5190 5191 5192 return Shadow; 5193} 5194 5195/// Hides a using shadow declaration. This is required by the current 5196/// using-decl implementation when a resolvable using declaration in a 5197/// class is followed by a declaration which would hide or override 5198/// one or more of the using decl's targets; for example: 5199/// 5200/// struct Base { void foo(int); }; 5201/// struct Derived : Base { 5202/// using Base::foo; 5203/// void foo(int); 5204/// }; 5205/// 5206/// The governing language is C++03 [namespace.udecl]p12: 5207/// 5208/// When a using-declaration brings names from a base class into a 5209/// derived class scope, member functions in the derived class 5210/// override and/or hide member functions with the same name and 5211/// parameter types in a base class (rather than conflicting). 5212/// 5213/// There are two ways to implement this: 5214/// (1) optimistically create shadow decls when they're not hidden 5215/// by existing declarations, or 5216/// (2) don't create any shadow decls (or at least don't make them 5217/// visible) until we've fully parsed/instantiated the class. 5218/// The problem with (1) is that we might have to retroactively remove 5219/// a shadow decl, which requires several O(n) operations because the 5220/// decl structures are (very reasonably) not designed for removal. 5221/// (2) avoids this but is very fiddly and phase-dependent. 5222void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5223 if (Shadow->getDeclName().getNameKind() == 5224 DeclarationName::CXXConversionFunctionName) 5225 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5226 5227 // Remove it from the DeclContext... 5228 Shadow->getDeclContext()->removeDecl(Shadow); 5229 5230 // ...and the scope, if applicable... 5231 if (S) { 5232 S->RemoveDecl(Shadow); 5233 IdResolver.RemoveDecl(Shadow); 5234 } 5235 5236 // ...and the using decl. 5237 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5238 5239 // TODO: complain somehow if Shadow was used. It shouldn't 5240 // be possible for this to happen, because...? 5241} 5242 5243/// Builds a using declaration. 5244/// 5245/// \param IsInstantiation - Whether this call arises from an 5246/// instantiation of an unresolved using declaration. We treat 5247/// the lookup differently for these declarations. 5248NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5249 SourceLocation UsingLoc, 5250 CXXScopeSpec &SS, 5251 const DeclarationNameInfo &NameInfo, 5252 AttributeList *AttrList, 5253 bool IsInstantiation, 5254 bool IsTypeName, 5255 SourceLocation TypenameLoc) { 5256 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5257 SourceLocation IdentLoc = NameInfo.getLoc(); 5258 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5259 5260 // FIXME: We ignore attributes for now. 5261 5262 if (SS.isEmpty()) { 5263 Diag(IdentLoc, diag::err_using_requires_qualname); 5264 return 0; 5265 } 5266 5267 // Do the redeclaration lookup in the current scope. 5268 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5269 ForRedeclaration); 5270 Previous.setHideTags(false); 5271 if (S) { 5272 LookupName(Previous, S); 5273 5274 // It is really dumb that we have to do this. 5275 LookupResult::Filter F = Previous.makeFilter(); 5276 while (F.hasNext()) { 5277 NamedDecl *D = F.next(); 5278 if (!isDeclInScope(D, CurContext, S)) 5279 F.erase(); 5280 } 5281 F.done(); 5282 } else { 5283 assert(IsInstantiation && "no scope in non-instantiation"); 5284 assert(CurContext->isRecord() && "scope not record in instantiation"); 5285 LookupQualifiedName(Previous, CurContext); 5286 } 5287 5288 // Check for invalid redeclarations. 5289 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5290 return 0; 5291 5292 // Check for bad qualifiers. 5293 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5294 return 0; 5295 5296 DeclContext *LookupContext = computeDeclContext(SS); 5297 NamedDecl *D; 5298 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5299 if (!LookupContext) { 5300 if (IsTypeName) { 5301 // FIXME: not all declaration name kinds are legal here 5302 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5303 UsingLoc, TypenameLoc, 5304 QualifierLoc, 5305 IdentLoc, NameInfo.getName()); 5306 } else { 5307 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5308 QualifierLoc, NameInfo); 5309 } 5310 } else { 5311 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5312 NameInfo, IsTypeName); 5313 } 5314 D->setAccess(AS); 5315 CurContext->addDecl(D); 5316 5317 if (!LookupContext) return D; 5318 UsingDecl *UD = cast<UsingDecl>(D); 5319 5320 if (RequireCompleteDeclContext(SS, LookupContext)) { 5321 UD->setInvalidDecl(); 5322 return UD; 5323 } 5324 5325 // Constructor inheriting using decls get special treatment. 5326 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5327 if (CheckInheritedConstructorUsingDecl(UD)) 5328 UD->setInvalidDecl(); 5329 return UD; 5330 } 5331 5332 // Otherwise, look up the target name. 5333 5334 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5335 5336 // Unlike most lookups, we don't always want to hide tag 5337 // declarations: tag names are visible through the using declaration 5338 // even if hidden by ordinary names, *except* in a dependent context 5339 // where it's important for the sanity of two-phase lookup. 5340 if (!IsInstantiation) 5341 R.setHideTags(false); 5342 5343 LookupQualifiedName(R, LookupContext); 5344 5345 if (R.empty()) { 5346 Diag(IdentLoc, diag::err_no_member) 5347 << NameInfo.getName() << LookupContext << SS.getRange(); 5348 UD->setInvalidDecl(); 5349 return UD; 5350 } 5351 5352 if (R.isAmbiguous()) { 5353 UD->setInvalidDecl(); 5354 return UD; 5355 } 5356 5357 if (IsTypeName) { 5358 // If we asked for a typename and got a non-type decl, error out. 5359 if (!R.getAsSingle<TypeDecl>()) { 5360 Diag(IdentLoc, diag::err_using_typename_non_type); 5361 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5362 Diag((*I)->getUnderlyingDecl()->getLocation(), 5363 diag::note_using_decl_target); 5364 UD->setInvalidDecl(); 5365 return UD; 5366 } 5367 } else { 5368 // If we asked for a non-typename and we got a type, error out, 5369 // but only if this is an instantiation of an unresolved using 5370 // decl. Otherwise just silently find the type name. 5371 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5372 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5373 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5374 UD->setInvalidDecl(); 5375 return UD; 5376 } 5377 } 5378 5379 // C++0x N2914 [namespace.udecl]p6: 5380 // A using-declaration shall not name a namespace. 5381 if (R.getAsSingle<NamespaceDecl>()) { 5382 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5383 << SS.getRange(); 5384 UD->setInvalidDecl(); 5385 return UD; 5386 } 5387 5388 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5389 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5390 BuildUsingShadowDecl(S, UD, *I); 5391 } 5392 5393 return UD; 5394} 5395 5396/// Additional checks for a using declaration referring to a constructor name. 5397bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5398 if (UD->isTypeName()) { 5399 // FIXME: Cannot specify typename when specifying constructor 5400 return true; 5401 } 5402 5403 const Type *SourceType = UD->getQualifier()->getAsType(); 5404 assert(SourceType && 5405 "Using decl naming constructor doesn't have type in scope spec."); 5406 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5407 5408 // Check whether the named type is a direct base class. 5409 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5410 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5411 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5412 BaseIt != BaseE; ++BaseIt) { 5413 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5414 if (CanonicalSourceType == BaseType) 5415 break; 5416 } 5417 5418 if (BaseIt == BaseE) { 5419 // Did not find SourceType in the bases. 5420 Diag(UD->getUsingLocation(), 5421 diag::err_using_decl_constructor_not_in_direct_base) 5422 << UD->getNameInfo().getSourceRange() 5423 << QualType(SourceType, 0) << TargetClass; 5424 return true; 5425 } 5426 5427 BaseIt->setInheritConstructors(); 5428 5429 return false; 5430} 5431 5432/// Checks that the given using declaration is not an invalid 5433/// redeclaration. Note that this is checking only for the using decl 5434/// itself, not for any ill-formedness among the UsingShadowDecls. 5435bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5436 bool isTypeName, 5437 const CXXScopeSpec &SS, 5438 SourceLocation NameLoc, 5439 const LookupResult &Prev) { 5440 // C++03 [namespace.udecl]p8: 5441 // C++0x [namespace.udecl]p10: 5442 // A using-declaration is a declaration and can therefore be used 5443 // repeatedly where (and only where) multiple declarations are 5444 // allowed. 5445 // 5446 // That's in non-member contexts. 5447 if (!CurContext->getRedeclContext()->isRecord()) 5448 return false; 5449 5450 NestedNameSpecifier *Qual 5451 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5452 5453 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5454 NamedDecl *D = *I; 5455 5456 bool DTypename; 5457 NestedNameSpecifier *DQual; 5458 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5459 DTypename = UD->isTypeName(); 5460 DQual = UD->getQualifier(); 5461 } else if (UnresolvedUsingValueDecl *UD 5462 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5463 DTypename = false; 5464 DQual = UD->getQualifier(); 5465 } else if (UnresolvedUsingTypenameDecl *UD 5466 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5467 DTypename = true; 5468 DQual = UD->getQualifier(); 5469 } else continue; 5470 5471 // using decls differ if one says 'typename' and the other doesn't. 5472 // FIXME: non-dependent using decls? 5473 if (isTypeName != DTypename) continue; 5474 5475 // using decls differ if they name different scopes (but note that 5476 // template instantiation can cause this check to trigger when it 5477 // didn't before instantiation). 5478 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5479 Context.getCanonicalNestedNameSpecifier(DQual)) 5480 continue; 5481 5482 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5483 Diag(D->getLocation(), diag::note_using_decl) << 1; 5484 return true; 5485 } 5486 5487 return false; 5488} 5489 5490 5491/// Checks that the given nested-name qualifier used in a using decl 5492/// in the current context is appropriately related to the current 5493/// scope. If an error is found, diagnoses it and returns true. 5494bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5495 const CXXScopeSpec &SS, 5496 SourceLocation NameLoc) { 5497 DeclContext *NamedContext = computeDeclContext(SS); 5498 5499 if (!CurContext->isRecord()) { 5500 // C++03 [namespace.udecl]p3: 5501 // C++0x [namespace.udecl]p8: 5502 // A using-declaration for a class member shall be a member-declaration. 5503 5504 // If we weren't able to compute a valid scope, it must be a 5505 // dependent class scope. 5506 if (!NamedContext || NamedContext->isRecord()) { 5507 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5508 << SS.getRange(); 5509 return true; 5510 } 5511 5512 // Otherwise, everything is known to be fine. 5513 return false; 5514 } 5515 5516 // The current scope is a record. 5517 5518 // If the named context is dependent, we can't decide much. 5519 if (!NamedContext) { 5520 // FIXME: in C++0x, we can diagnose if we can prove that the 5521 // nested-name-specifier does not refer to a base class, which is 5522 // still possible in some cases. 5523 5524 // Otherwise we have to conservatively report that things might be 5525 // okay. 5526 return false; 5527 } 5528 5529 if (!NamedContext->isRecord()) { 5530 // Ideally this would point at the last name in the specifier, 5531 // but we don't have that level of source info. 5532 Diag(SS.getRange().getBegin(), 5533 diag::err_using_decl_nested_name_specifier_is_not_class) 5534 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5535 return true; 5536 } 5537 5538 if (!NamedContext->isDependentContext() && 5539 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5540 return true; 5541 5542 if (getLangOptions().CPlusPlus0x) { 5543 // C++0x [namespace.udecl]p3: 5544 // In a using-declaration used as a member-declaration, the 5545 // nested-name-specifier shall name a base class of the class 5546 // being defined. 5547 5548 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5549 cast<CXXRecordDecl>(NamedContext))) { 5550 if (CurContext == NamedContext) { 5551 Diag(NameLoc, 5552 diag::err_using_decl_nested_name_specifier_is_current_class) 5553 << SS.getRange(); 5554 return true; 5555 } 5556 5557 Diag(SS.getRange().getBegin(), 5558 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5559 << (NestedNameSpecifier*) SS.getScopeRep() 5560 << cast<CXXRecordDecl>(CurContext) 5561 << SS.getRange(); 5562 return true; 5563 } 5564 5565 return false; 5566 } 5567 5568 // C++03 [namespace.udecl]p4: 5569 // A using-declaration used as a member-declaration shall refer 5570 // to a member of a base class of the class being defined [etc.]. 5571 5572 // Salient point: SS doesn't have to name a base class as long as 5573 // lookup only finds members from base classes. Therefore we can 5574 // diagnose here only if we can prove that that can't happen, 5575 // i.e. if the class hierarchies provably don't intersect. 5576 5577 // TODO: it would be nice if "definitely valid" results were cached 5578 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5579 // need to be repeated. 5580 5581 struct UserData { 5582 llvm::DenseSet<const CXXRecordDecl*> Bases; 5583 5584 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5585 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5586 Data->Bases.insert(Base); 5587 return true; 5588 } 5589 5590 bool hasDependentBases(const CXXRecordDecl *Class) { 5591 return !Class->forallBases(collect, this); 5592 } 5593 5594 /// Returns true if the base is dependent or is one of the 5595 /// accumulated base classes. 5596 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5597 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5598 return !Data->Bases.count(Base); 5599 } 5600 5601 bool mightShareBases(const CXXRecordDecl *Class) { 5602 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5603 } 5604 }; 5605 5606 UserData Data; 5607 5608 // Returns false if we find a dependent base. 5609 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5610 return false; 5611 5612 // Returns false if the class has a dependent base or if it or one 5613 // of its bases is present in the base set of the current context. 5614 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5615 return false; 5616 5617 Diag(SS.getRange().getBegin(), 5618 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5619 << (NestedNameSpecifier*) SS.getScopeRep() 5620 << cast<CXXRecordDecl>(CurContext) 5621 << SS.getRange(); 5622 5623 return true; 5624} 5625 5626Decl *Sema::ActOnAliasDeclaration(Scope *S, 5627 AccessSpecifier AS, 5628 MultiTemplateParamsArg TemplateParamLists, 5629 SourceLocation UsingLoc, 5630 UnqualifiedId &Name, 5631 TypeResult Type) { 5632 // Skip up to the relevant declaration scope. 5633 while (S->getFlags() & Scope::TemplateParamScope) 5634 S = S->getParent(); 5635 assert((S->getFlags() & Scope::DeclScope) && 5636 "got alias-declaration outside of declaration scope"); 5637 5638 if (Type.isInvalid()) 5639 return 0; 5640 5641 bool Invalid = false; 5642 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5643 TypeSourceInfo *TInfo = 0; 5644 GetTypeFromParser(Type.get(), &TInfo); 5645 5646 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5647 return 0; 5648 5649 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5650 UPPC_DeclarationType)) { 5651 Invalid = true; 5652 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5653 TInfo->getTypeLoc().getBeginLoc()); 5654 } 5655 5656 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5657 LookupName(Previous, S); 5658 5659 // Warn about shadowing the name of a template parameter. 5660 if (Previous.isSingleResult() && 5661 Previous.getFoundDecl()->isTemplateParameter()) { 5662 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5663 Previous.getFoundDecl())) 5664 Invalid = true; 5665 Previous.clear(); 5666 } 5667 5668 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5669 "name in alias declaration must be an identifier"); 5670 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5671 Name.StartLocation, 5672 Name.Identifier, TInfo); 5673 5674 NewTD->setAccess(AS); 5675 5676 if (Invalid) 5677 NewTD->setInvalidDecl(); 5678 5679 CheckTypedefForVariablyModifiedType(S, NewTD); 5680 Invalid |= NewTD->isInvalidDecl(); 5681 5682 bool Redeclaration = false; 5683 5684 NamedDecl *NewND; 5685 if (TemplateParamLists.size()) { 5686 TypeAliasTemplateDecl *OldDecl = 0; 5687 TemplateParameterList *OldTemplateParams = 0; 5688 5689 if (TemplateParamLists.size() != 1) { 5690 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5691 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5692 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5693 } 5694 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5695 5696 // Only consider previous declarations in the same scope. 5697 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5698 /*ExplicitInstantiationOrSpecialization*/false); 5699 if (!Previous.empty()) { 5700 Redeclaration = true; 5701 5702 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5703 if (!OldDecl && !Invalid) { 5704 Diag(UsingLoc, diag::err_redefinition_different_kind) 5705 << Name.Identifier; 5706 5707 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5708 if (OldD->getLocation().isValid()) 5709 Diag(OldD->getLocation(), diag::note_previous_definition); 5710 5711 Invalid = true; 5712 } 5713 5714 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5715 if (TemplateParameterListsAreEqual(TemplateParams, 5716 OldDecl->getTemplateParameters(), 5717 /*Complain=*/true, 5718 TPL_TemplateMatch)) 5719 OldTemplateParams = OldDecl->getTemplateParameters(); 5720 else 5721 Invalid = true; 5722 5723 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5724 if (!Invalid && 5725 !Context.hasSameType(OldTD->getUnderlyingType(), 5726 NewTD->getUnderlyingType())) { 5727 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5728 // but we can't reasonably accept it. 5729 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5730 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5731 if (OldTD->getLocation().isValid()) 5732 Diag(OldTD->getLocation(), diag::note_previous_definition); 5733 Invalid = true; 5734 } 5735 } 5736 } 5737 5738 // Merge any previous default template arguments into our parameters, 5739 // and check the parameter list. 5740 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5741 TPC_TypeAliasTemplate)) 5742 return 0; 5743 5744 TypeAliasTemplateDecl *NewDecl = 5745 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5746 Name.Identifier, TemplateParams, 5747 NewTD); 5748 5749 NewDecl->setAccess(AS); 5750 5751 if (Invalid) 5752 NewDecl->setInvalidDecl(); 5753 else if (OldDecl) 5754 NewDecl->setPreviousDeclaration(OldDecl); 5755 5756 NewND = NewDecl; 5757 } else { 5758 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5759 NewND = NewTD; 5760 } 5761 5762 if (!Redeclaration) 5763 PushOnScopeChains(NewND, S); 5764 5765 return NewND; 5766} 5767 5768Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5769 SourceLocation NamespaceLoc, 5770 SourceLocation AliasLoc, 5771 IdentifierInfo *Alias, 5772 CXXScopeSpec &SS, 5773 SourceLocation IdentLoc, 5774 IdentifierInfo *Ident) { 5775 5776 // Lookup the namespace name. 5777 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5778 LookupParsedName(R, S, &SS); 5779 5780 // Check if we have a previous declaration with the same name. 5781 NamedDecl *PrevDecl 5782 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5783 ForRedeclaration); 5784 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5785 PrevDecl = 0; 5786 5787 if (PrevDecl) { 5788 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5789 // We already have an alias with the same name that points to the same 5790 // namespace, so don't create a new one. 5791 // FIXME: At some point, we'll want to create the (redundant) 5792 // declaration to maintain better source information. 5793 if (!R.isAmbiguous() && !R.empty() && 5794 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5795 return 0; 5796 } 5797 5798 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5799 diag::err_redefinition_different_kind; 5800 Diag(AliasLoc, DiagID) << Alias; 5801 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5802 return 0; 5803 } 5804 5805 if (R.isAmbiguous()) 5806 return 0; 5807 5808 if (R.empty()) { 5809 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5810 CTC_NoKeywords, 0)) { 5811 if (R.getAsSingle<NamespaceDecl>() || 5812 R.getAsSingle<NamespaceAliasDecl>()) { 5813 if (DeclContext *DC = computeDeclContext(SS, false)) 5814 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5815 << Ident << DC << Corrected << SS.getRange() 5816 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5817 else 5818 Diag(IdentLoc, diag::err_using_directive_suggest) 5819 << Ident << Corrected 5820 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5821 5822 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5823 << Corrected; 5824 5825 Ident = Corrected.getAsIdentifierInfo(); 5826 } else { 5827 R.clear(); 5828 R.setLookupName(Ident); 5829 } 5830 } 5831 5832 if (R.empty()) { 5833 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5834 return 0; 5835 } 5836 } 5837 5838 NamespaceAliasDecl *AliasDecl = 5839 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5840 Alias, SS.getWithLocInContext(Context), 5841 IdentLoc, R.getFoundDecl()); 5842 5843 PushOnScopeChains(AliasDecl, S); 5844 return AliasDecl; 5845} 5846 5847namespace { 5848 /// \brief Scoped object used to handle the state changes required in Sema 5849 /// to implicitly define the body of a C++ member function; 5850 class ImplicitlyDefinedFunctionScope { 5851 Sema &S; 5852 Sema::ContextRAII SavedContext; 5853 5854 public: 5855 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5856 : S(S), SavedContext(S, Method) 5857 { 5858 S.PushFunctionScope(); 5859 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5860 } 5861 5862 ~ImplicitlyDefinedFunctionScope() { 5863 S.PopExpressionEvaluationContext(); 5864 S.PopFunctionOrBlockScope(); 5865 } 5866 }; 5867} 5868 5869static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5870 CXXRecordDecl *D) { 5871 ASTContext &Context = Self.Context; 5872 QualType ClassType = Context.getTypeDeclType(D); 5873 DeclarationName ConstructorName 5874 = Context.DeclarationNames.getCXXConstructorName( 5875 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5876 5877 DeclContext::lookup_const_iterator Con, ConEnd; 5878 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5879 Con != ConEnd; ++Con) { 5880 // FIXME: In C++0x, a constructor template can be a default constructor. 5881 if (isa<FunctionTemplateDecl>(*Con)) 5882 continue; 5883 5884 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5885 if (Constructor->isDefaultConstructor()) 5886 return Constructor; 5887 } 5888 return 0; 5889} 5890 5891Sema::ImplicitExceptionSpecification 5892Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5893 // C++ [except.spec]p14: 5894 // An implicitly declared special member function (Clause 12) shall have an 5895 // exception-specification. [...] 5896 ImplicitExceptionSpecification ExceptSpec(Context); 5897 5898 // Direct base-class constructors. 5899 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5900 BEnd = ClassDecl->bases_end(); 5901 B != BEnd; ++B) { 5902 if (B->isVirtual()) // Handled below. 5903 continue; 5904 5905 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5906 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5907 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5908 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5909 else if (CXXConstructorDecl *Constructor 5910 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5911 ExceptSpec.CalledDecl(Constructor); 5912 } 5913 } 5914 5915 // Virtual base-class constructors. 5916 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5917 BEnd = ClassDecl->vbases_end(); 5918 B != BEnd; ++B) { 5919 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5920 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5921 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5922 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5923 else if (CXXConstructorDecl *Constructor 5924 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5925 ExceptSpec.CalledDecl(Constructor); 5926 } 5927 } 5928 5929 // Field constructors. 5930 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5931 FEnd = ClassDecl->field_end(); 5932 F != FEnd; ++F) { 5933 if (const RecordType *RecordTy 5934 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5935 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5936 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5937 ExceptSpec.CalledDecl( 5938 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5939 else if (CXXConstructorDecl *Constructor 5940 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5941 ExceptSpec.CalledDecl(Constructor); 5942 } 5943 } 5944 5945 return ExceptSpec; 5946} 5947 5948CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5949 CXXRecordDecl *ClassDecl) { 5950 // C++ [class.ctor]p5: 5951 // A default constructor for a class X is a constructor of class X 5952 // that can be called without an argument. If there is no 5953 // user-declared constructor for class X, a default constructor is 5954 // implicitly declared. An implicitly-declared default constructor 5955 // is an inline public member of its class. 5956 assert(!ClassDecl->hasUserDeclaredConstructor() && 5957 "Should not build implicit default constructor!"); 5958 5959 ImplicitExceptionSpecification Spec = 5960 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5961 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5962 5963 // Create the actual constructor declaration. 5964 CanQualType ClassType 5965 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5966 SourceLocation ClassLoc = ClassDecl->getLocation(); 5967 DeclarationName Name 5968 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5969 DeclarationNameInfo NameInfo(Name, ClassLoc); 5970 CXXConstructorDecl *DefaultCon 5971 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5972 Context.getFunctionType(Context.VoidTy, 5973 0, 0, EPI), 5974 /*TInfo=*/0, 5975 /*isExplicit=*/false, 5976 /*isInline=*/true, 5977 /*isImplicitlyDeclared=*/true); 5978 DefaultCon->setAccess(AS_public); 5979 DefaultCon->setDefaulted(); 5980 DefaultCon->setImplicit(); 5981 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5982 5983 // Note that we have declared this constructor. 5984 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5985 5986 if (Scope *S = getScopeForContext(ClassDecl)) 5987 PushOnScopeChains(DefaultCon, S, false); 5988 ClassDecl->addDecl(DefaultCon); 5989 5990 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5991 DefaultCon->setDeletedAsWritten(); 5992 5993 return DefaultCon; 5994} 5995 5996void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5997 CXXConstructorDecl *Constructor) { 5998 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5999 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 6000 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6001 6002 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6003 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6004 6005 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6006 DiagnosticErrorTrap Trap(Diags); 6007 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6008 Trap.hasErrorOccurred()) { 6009 Diag(CurrentLocation, diag::note_member_synthesized_at) 6010 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6011 Constructor->setInvalidDecl(); 6012 return; 6013 } 6014 6015 SourceLocation Loc = Constructor->getLocation(); 6016 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6017 6018 Constructor->setUsed(); 6019 MarkVTableUsed(CurrentLocation, ClassDecl); 6020 6021 if (ASTMutationListener *L = getASTMutationListener()) { 6022 L->CompletedImplicitDefinition(Constructor); 6023 } 6024} 6025 6026void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6027 // We start with an initial pass over the base classes to collect those that 6028 // inherit constructors from. If there are none, we can forgo all further 6029 // processing. 6030 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6031 BasesVector BasesToInheritFrom; 6032 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6033 BaseE = ClassDecl->bases_end(); 6034 BaseIt != BaseE; ++BaseIt) { 6035 if (BaseIt->getInheritConstructors()) { 6036 QualType Base = BaseIt->getType(); 6037 if (Base->isDependentType()) { 6038 // If we inherit constructors from anything that is dependent, just 6039 // abort processing altogether. We'll get another chance for the 6040 // instantiations. 6041 return; 6042 } 6043 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6044 } 6045 } 6046 if (BasesToInheritFrom.empty()) 6047 return; 6048 6049 // Now collect the constructors that we already have in the current class. 6050 // Those take precedence over inherited constructors. 6051 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6052 // unless there is a user-declared constructor with the same signature in 6053 // the class where the using-declaration appears. 6054 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6055 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6056 CtorE = ClassDecl->ctor_end(); 6057 CtorIt != CtorE; ++CtorIt) { 6058 ExistingConstructors.insert( 6059 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6060 } 6061 6062 Scope *S = getScopeForContext(ClassDecl); 6063 DeclarationName CreatedCtorName = 6064 Context.DeclarationNames.getCXXConstructorName( 6065 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6066 6067 // Now comes the true work. 6068 // First, we keep a map from constructor types to the base that introduced 6069 // them. Needed for finding conflicting constructors. We also keep the 6070 // actually inserted declarations in there, for pretty diagnostics. 6071 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6072 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6073 ConstructorToSourceMap InheritedConstructors; 6074 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6075 BaseE = BasesToInheritFrom.end(); 6076 BaseIt != BaseE; ++BaseIt) { 6077 const RecordType *Base = *BaseIt; 6078 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6079 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6080 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6081 CtorE = BaseDecl->ctor_end(); 6082 CtorIt != CtorE; ++CtorIt) { 6083 // Find the using declaration for inheriting this base's constructors. 6084 DeclarationName Name = 6085 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6086 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6087 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6088 SourceLocation UsingLoc = UD ? UD->getLocation() : 6089 ClassDecl->getLocation(); 6090 6091 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6092 // from the class X named in the using-declaration consists of actual 6093 // constructors and notional constructors that result from the 6094 // transformation of defaulted parameters as follows: 6095 // - all non-template default constructors of X, and 6096 // - for each non-template constructor of X that has at least one 6097 // parameter with a default argument, the set of constructors that 6098 // results from omitting any ellipsis parameter specification and 6099 // successively omitting parameters with a default argument from the 6100 // end of the parameter-type-list. 6101 CXXConstructorDecl *BaseCtor = *CtorIt; 6102 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6103 const FunctionProtoType *BaseCtorType = 6104 BaseCtor->getType()->getAs<FunctionProtoType>(); 6105 6106 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6107 maxParams = BaseCtor->getNumParams(); 6108 params <= maxParams; ++params) { 6109 // Skip default constructors. They're never inherited. 6110 if (params == 0) 6111 continue; 6112 // Skip copy and move constructors for the same reason. 6113 if (CanBeCopyOrMove && params == 1) 6114 continue; 6115 6116 // Build up a function type for this particular constructor. 6117 // FIXME: The working paper does not consider that the exception spec 6118 // for the inheriting constructor might be larger than that of the 6119 // source. This code doesn't yet, either. 6120 const Type *NewCtorType; 6121 if (params == maxParams) 6122 NewCtorType = BaseCtorType; 6123 else { 6124 llvm::SmallVector<QualType, 16> Args; 6125 for (unsigned i = 0; i < params; ++i) { 6126 Args.push_back(BaseCtorType->getArgType(i)); 6127 } 6128 FunctionProtoType::ExtProtoInfo ExtInfo = 6129 BaseCtorType->getExtProtoInfo(); 6130 ExtInfo.Variadic = false; 6131 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6132 Args.data(), params, ExtInfo) 6133 .getTypePtr(); 6134 } 6135 const Type *CanonicalNewCtorType = 6136 Context.getCanonicalType(NewCtorType); 6137 6138 // Now that we have the type, first check if the class already has a 6139 // constructor with this signature. 6140 if (ExistingConstructors.count(CanonicalNewCtorType)) 6141 continue; 6142 6143 // Then we check if we have already declared an inherited constructor 6144 // with this signature. 6145 std::pair<ConstructorToSourceMap::iterator, bool> result = 6146 InheritedConstructors.insert(std::make_pair( 6147 CanonicalNewCtorType, 6148 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6149 if (!result.second) { 6150 // Already in the map. If it came from a different class, that's an 6151 // error. Not if it's from the same. 6152 CanQualType PreviousBase = result.first->second.first; 6153 if (CanonicalBase != PreviousBase) { 6154 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6155 const CXXConstructorDecl *PrevBaseCtor = 6156 PrevCtor->getInheritedConstructor(); 6157 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6158 6159 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6160 Diag(BaseCtor->getLocation(), 6161 diag::note_using_decl_constructor_conflict_current_ctor); 6162 Diag(PrevBaseCtor->getLocation(), 6163 diag::note_using_decl_constructor_conflict_previous_ctor); 6164 Diag(PrevCtor->getLocation(), 6165 diag::note_using_decl_constructor_conflict_previous_using); 6166 } 6167 continue; 6168 } 6169 6170 // OK, we're there, now add the constructor. 6171 // C++0x [class.inhctor]p8: [...] that would be performed by a 6172 // user-writtern inline constructor [...] 6173 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6174 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6175 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6176 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6177 /*ImplicitlyDeclared=*/true); 6178 NewCtor->setAccess(BaseCtor->getAccess()); 6179 6180 // Build up the parameter decls and add them. 6181 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6182 for (unsigned i = 0; i < params; ++i) { 6183 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6184 UsingLoc, UsingLoc, 6185 /*IdentifierInfo=*/0, 6186 BaseCtorType->getArgType(i), 6187 /*TInfo=*/0, SC_None, 6188 SC_None, /*DefaultArg=*/0)); 6189 } 6190 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6191 NewCtor->setInheritedConstructor(BaseCtor); 6192 6193 PushOnScopeChains(NewCtor, S, false); 6194 ClassDecl->addDecl(NewCtor); 6195 result.first->second.second = NewCtor; 6196 } 6197 } 6198 } 6199} 6200 6201Sema::ImplicitExceptionSpecification 6202Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6203 // C++ [except.spec]p14: 6204 // An implicitly declared special member function (Clause 12) shall have 6205 // an exception-specification. 6206 ImplicitExceptionSpecification ExceptSpec(Context); 6207 6208 // Direct base-class destructors. 6209 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6210 BEnd = ClassDecl->bases_end(); 6211 B != BEnd; ++B) { 6212 if (B->isVirtual()) // Handled below. 6213 continue; 6214 6215 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6216 ExceptSpec.CalledDecl( 6217 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6218 } 6219 6220 // Virtual base-class destructors. 6221 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6222 BEnd = ClassDecl->vbases_end(); 6223 B != BEnd; ++B) { 6224 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6225 ExceptSpec.CalledDecl( 6226 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6227 } 6228 6229 // Field destructors. 6230 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6231 FEnd = ClassDecl->field_end(); 6232 F != FEnd; ++F) { 6233 if (const RecordType *RecordTy 6234 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6235 ExceptSpec.CalledDecl( 6236 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6237 } 6238 6239 return ExceptSpec; 6240} 6241 6242CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6243 // C++ [class.dtor]p2: 6244 // If a class has no user-declared destructor, a destructor is 6245 // declared implicitly. An implicitly-declared destructor is an 6246 // inline public member of its class. 6247 6248 ImplicitExceptionSpecification Spec = 6249 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6250 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6251 6252 // Create the actual destructor declaration. 6253 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6254 6255 CanQualType ClassType 6256 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6257 SourceLocation ClassLoc = ClassDecl->getLocation(); 6258 DeclarationName Name 6259 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6260 DeclarationNameInfo NameInfo(Name, ClassLoc); 6261 CXXDestructorDecl *Destructor 6262 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6263 /*isInline=*/true, 6264 /*isImplicitlyDeclared=*/true); 6265 Destructor->setAccess(AS_public); 6266 Destructor->setDefaulted(); 6267 Destructor->setImplicit(); 6268 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6269 6270 // Note that we have declared this destructor. 6271 ++ASTContext::NumImplicitDestructorsDeclared; 6272 6273 // Introduce this destructor into its scope. 6274 if (Scope *S = getScopeForContext(ClassDecl)) 6275 PushOnScopeChains(Destructor, S, false); 6276 ClassDecl->addDecl(Destructor); 6277 6278 // This could be uniqued if it ever proves significant. 6279 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6280 6281 if (ShouldDeleteDestructor(Destructor)) 6282 Destructor->setDeletedAsWritten(); 6283 6284 AddOverriddenMethods(ClassDecl, Destructor); 6285 6286 return Destructor; 6287} 6288 6289void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6290 CXXDestructorDecl *Destructor) { 6291 assert((Destructor->isDefaulted() && !Destructor->isUsed(false)) && 6292 "DefineImplicitDestructor - call it for implicit default dtor"); 6293 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6294 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6295 6296 if (Destructor->isInvalidDecl()) 6297 return; 6298 6299 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6300 6301 DiagnosticErrorTrap Trap(Diags); 6302 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6303 Destructor->getParent()); 6304 6305 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6306 Diag(CurrentLocation, diag::note_member_synthesized_at) 6307 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6308 6309 Destructor->setInvalidDecl(); 6310 return; 6311 } 6312 6313 SourceLocation Loc = Destructor->getLocation(); 6314 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6315 6316 Destructor->setUsed(); 6317 MarkVTableUsed(CurrentLocation, ClassDecl); 6318 6319 if (ASTMutationListener *L = getASTMutationListener()) { 6320 L->CompletedImplicitDefinition(Destructor); 6321 } 6322} 6323 6324void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6325 CXXDestructorDecl *destructor) { 6326 // C++11 [class.dtor]p3: 6327 // A declaration of a destructor that does not have an exception- 6328 // specification is implicitly considered to have the same exception- 6329 // specification as an implicit declaration. 6330 const FunctionProtoType *dtorType = destructor->getType()-> 6331 getAs<FunctionProtoType>(); 6332 if (dtorType->hasExceptionSpec()) 6333 return; 6334 6335 ImplicitExceptionSpecification exceptSpec = 6336 ComputeDefaultedDtorExceptionSpec(classDecl); 6337 6338 // Replace the destructor's type. 6339 FunctionProtoType::ExtProtoInfo epi; 6340 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6341 epi.NumExceptions = exceptSpec.size(); 6342 epi.Exceptions = exceptSpec.data(); 6343 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6344 6345 destructor->setType(ty); 6346 6347 // FIXME: If the destructor has a body that could throw, and the newly created 6348 // spec doesn't allow exceptions, we should emit a warning, because this 6349 // change in behavior can break conforming C++03 programs at runtime. 6350 // However, we don't have a body yet, so it needs to be done somewhere else. 6351} 6352 6353/// \brief Builds a statement that copies the given entity from \p From to 6354/// \c To. 6355/// 6356/// This routine is used to copy the members of a class with an 6357/// implicitly-declared copy assignment operator. When the entities being 6358/// copied are arrays, this routine builds for loops to copy them. 6359/// 6360/// \param S The Sema object used for type-checking. 6361/// 6362/// \param Loc The location where the implicit copy is being generated. 6363/// 6364/// \param T The type of the expressions being copied. Both expressions must 6365/// have this type. 6366/// 6367/// \param To The expression we are copying to. 6368/// 6369/// \param From The expression we are copying from. 6370/// 6371/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6372/// Otherwise, it's a non-static member subobject. 6373/// 6374/// \param Depth Internal parameter recording the depth of the recursion. 6375/// 6376/// \returns A statement or a loop that copies the expressions. 6377static StmtResult 6378BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6379 Expr *To, Expr *From, 6380 bool CopyingBaseSubobject, unsigned Depth = 0) { 6381 // C++0x [class.copy]p30: 6382 // Each subobject is assigned in the manner appropriate to its type: 6383 // 6384 // - if the subobject is of class type, the copy assignment operator 6385 // for the class is used (as if by explicit qualification; that is, 6386 // ignoring any possible virtual overriding functions in more derived 6387 // classes); 6388 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6389 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6390 6391 // Look for operator=. 6392 DeclarationName Name 6393 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6394 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6395 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6396 6397 // Filter out any result that isn't a copy-assignment operator. 6398 LookupResult::Filter F = OpLookup.makeFilter(); 6399 while (F.hasNext()) { 6400 NamedDecl *D = F.next(); 6401 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6402 if (Method->isCopyAssignmentOperator()) 6403 continue; 6404 6405 F.erase(); 6406 } 6407 F.done(); 6408 6409 // Suppress the protected check (C++ [class.protected]) for each of the 6410 // assignment operators we found. This strange dance is required when 6411 // we're assigning via a base classes's copy-assignment operator. To 6412 // ensure that we're getting the right base class subobject (without 6413 // ambiguities), we need to cast "this" to that subobject type; to 6414 // ensure that we don't go through the virtual call mechanism, we need 6415 // to qualify the operator= name with the base class (see below). However, 6416 // this means that if the base class has a protected copy assignment 6417 // operator, the protected member access check will fail. So, we 6418 // rewrite "protected" access to "public" access in this case, since we 6419 // know by construction that we're calling from a derived class. 6420 if (CopyingBaseSubobject) { 6421 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6422 L != LEnd; ++L) { 6423 if (L.getAccess() == AS_protected) 6424 L.setAccess(AS_public); 6425 } 6426 } 6427 6428 // Create the nested-name-specifier that will be used to qualify the 6429 // reference to operator=; this is required to suppress the virtual 6430 // call mechanism. 6431 CXXScopeSpec SS; 6432 SS.MakeTrivial(S.Context, 6433 NestedNameSpecifier::Create(S.Context, 0, false, 6434 T.getTypePtr()), 6435 Loc); 6436 6437 // Create the reference to operator=. 6438 ExprResult OpEqualRef 6439 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6440 /*FirstQualifierInScope=*/0, OpLookup, 6441 /*TemplateArgs=*/0, 6442 /*SuppressQualifierCheck=*/true); 6443 if (OpEqualRef.isInvalid()) 6444 return StmtError(); 6445 6446 // Build the call to the assignment operator. 6447 6448 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6449 OpEqualRef.takeAs<Expr>(), 6450 Loc, &From, 1, Loc); 6451 if (Call.isInvalid()) 6452 return StmtError(); 6453 6454 return S.Owned(Call.takeAs<Stmt>()); 6455 } 6456 6457 // - if the subobject is of scalar type, the built-in assignment 6458 // operator is used. 6459 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6460 if (!ArrayTy) { 6461 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6462 if (Assignment.isInvalid()) 6463 return StmtError(); 6464 6465 return S.Owned(Assignment.takeAs<Stmt>()); 6466 } 6467 6468 // - if the subobject is an array, each element is assigned, in the 6469 // manner appropriate to the element type; 6470 6471 // Construct a loop over the array bounds, e.g., 6472 // 6473 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6474 // 6475 // that will copy each of the array elements. 6476 QualType SizeType = S.Context.getSizeType(); 6477 6478 // Create the iteration variable. 6479 IdentifierInfo *IterationVarName = 0; 6480 { 6481 llvm::SmallString<8> Str; 6482 llvm::raw_svector_ostream OS(Str); 6483 OS << "__i" << Depth; 6484 IterationVarName = &S.Context.Idents.get(OS.str()); 6485 } 6486 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6487 IterationVarName, SizeType, 6488 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6489 SC_None, SC_None); 6490 6491 // Initialize the iteration variable to zero. 6492 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6493 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6494 6495 // Create a reference to the iteration variable; we'll use this several 6496 // times throughout. 6497 Expr *IterationVarRef 6498 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6499 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6500 6501 // Create the DeclStmt that holds the iteration variable. 6502 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6503 6504 // Create the comparison against the array bound. 6505 llvm::APInt Upper 6506 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6507 Expr *Comparison 6508 = new (S.Context) BinaryOperator(IterationVarRef, 6509 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6510 BO_NE, S.Context.BoolTy, 6511 VK_RValue, OK_Ordinary, Loc); 6512 6513 // Create the pre-increment of the iteration variable. 6514 Expr *Increment 6515 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6516 VK_LValue, OK_Ordinary, Loc); 6517 6518 // Subscript the "from" and "to" expressions with the iteration variable. 6519 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6520 IterationVarRef, Loc)); 6521 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6522 IterationVarRef, Loc)); 6523 6524 // Build the copy for an individual element of the array. 6525 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6526 To, From, CopyingBaseSubobject, 6527 Depth + 1); 6528 if (Copy.isInvalid()) 6529 return StmtError(); 6530 6531 // Construct the loop that copies all elements of this array. 6532 return S.ActOnForStmt(Loc, Loc, InitStmt, 6533 S.MakeFullExpr(Comparison), 6534 0, S.MakeFullExpr(Increment), 6535 Loc, Copy.take()); 6536} 6537 6538/// \brief Determine whether the given class has a copy assignment operator 6539/// that accepts a const-qualified argument. 6540static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6541 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6542 6543 if (!Class->hasDeclaredCopyAssignment()) 6544 S.DeclareImplicitCopyAssignment(Class); 6545 6546 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6547 DeclarationName OpName 6548 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6549 6550 DeclContext::lookup_const_iterator Op, OpEnd; 6551 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6552 // C++ [class.copy]p9: 6553 // A user-declared copy assignment operator is a non-static non-template 6554 // member function of class X with exactly one parameter of type X, X&, 6555 // const X&, volatile X& or const volatile X&. 6556 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6557 if (!Method) 6558 continue; 6559 6560 if (Method->isStatic()) 6561 continue; 6562 if (Method->getPrimaryTemplate()) 6563 continue; 6564 const FunctionProtoType *FnType = 6565 Method->getType()->getAs<FunctionProtoType>(); 6566 assert(FnType && "Overloaded operator has no prototype."); 6567 // Don't assert on this; an invalid decl might have been left in the AST. 6568 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6569 continue; 6570 bool AcceptsConst = true; 6571 QualType ArgType = FnType->getArgType(0); 6572 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6573 ArgType = Ref->getPointeeType(); 6574 // Is it a non-const lvalue reference? 6575 if (!ArgType.isConstQualified()) 6576 AcceptsConst = false; 6577 } 6578 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6579 continue; 6580 6581 // We have a single argument of type cv X or cv X&, i.e. we've found the 6582 // copy assignment operator. Return whether it accepts const arguments. 6583 return AcceptsConst; 6584 } 6585 assert(Class->isInvalidDecl() && 6586 "No copy assignment operator declared in valid code."); 6587 return false; 6588} 6589 6590std::pair<Sema::ImplicitExceptionSpecification, bool> 6591Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6592 CXXRecordDecl *ClassDecl) { 6593 // C++ [class.copy]p10: 6594 // If the class definition does not explicitly declare a copy 6595 // assignment operator, one is declared implicitly. 6596 // The implicitly-defined copy assignment operator for a class X 6597 // will have the form 6598 // 6599 // X& X::operator=(const X&) 6600 // 6601 // if 6602 bool HasConstCopyAssignment = true; 6603 6604 // -- each direct base class B of X has a copy assignment operator 6605 // whose parameter is of type const B&, const volatile B& or B, 6606 // and 6607 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6608 BaseEnd = ClassDecl->bases_end(); 6609 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6610 assert(!Base->getType()->isDependentType() && 6611 "Cannot generate implicit members for class with dependent bases."); 6612 const CXXRecordDecl *BaseClassDecl 6613 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6614 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6615 } 6616 6617 // -- for all the nonstatic data members of X that are of a class 6618 // type M (or array thereof), each such class type has a copy 6619 // assignment operator whose parameter is of type const M&, 6620 // const volatile M& or M. 6621 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6622 FieldEnd = ClassDecl->field_end(); 6623 HasConstCopyAssignment && Field != FieldEnd; 6624 ++Field) { 6625 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6626 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6627 const CXXRecordDecl *FieldClassDecl 6628 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6629 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6630 } 6631 } 6632 6633 // Otherwise, the implicitly declared copy assignment operator will 6634 // have the form 6635 // 6636 // X& X::operator=(X&) 6637 6638 // C++ [except.spec]p14: 6639 // An implicitly declared special member function (Clause 12) shall have an 6640 // exception-specification. [...] 6641 ImplicitExceptionSpecification ExceptSpec(Context); 6642 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6643 BaseEnd = ClassDecl->bases_end(); 6644 Base != BaseEnd; ++Base) { 6645 CXXRecordDecl *BaseClassDecl 6646 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6647 6648 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6649 DeclareImplicitCopyAssignment(BaseClassDecl); 6650 6651 if (CXXMethodDecl *CopyAssign 6652 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6653 ExceptSpec.CalledDecl(CopyAssign); 6654 } 6655 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6656 FieldEnd = ClassDecl->field_end(); 6657 Field != FieldEnd; 6658 ++Field) { 6659 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6660 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6661 CXXRecordDecl *FieldClassDecl 6662 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6663 6664 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6665 DeclareImplicitCopyAssignment(FieldClassDecl); 6666 6667 if (CXXMethodDecl *CopyAssign 6668 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6669 ExceptSpec.CalledDecl(CopyAssign); 6670 } 6671 } 6672 6673 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6674} 6675 6676CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6677 // Note: The following rules are largely analoguous to the copy 6678 // constructor rules. Note that virtual bases are not taken into account 6679 // for determining the argument type of the operator. Note also that 6680 // operators taking an object instead of a reference are allowed. 6681 6682 ImplicitExceptionSpecification Spec(Context); 6683 bool Const; 6684 llvm::tie(Spec, Const) = 6685 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6686 6687 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6688 QualType RetType = Context.getLValueReferenceType(ArgType); 6689 if (Const) 6690 ArgType = ArgType.withConst(); 6691 ArgType = Context.getLValueReferenceType(ArgType); 6692 6693 // An implicitly-declared copy assignment operator is an inline public 6694 // member of its class. 6695 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6696 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6697 SourceLocation ClassLoc = ClassDecl->getLocation(); 6698 DeclarationNameInfo NameInfo(Name, ClassLoc); 6699 CXXMethodDecl *CopyAssignment 6700 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6701 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6702 /*TInfo=*/0, /*isStatic=*/false, 6703 /*StorageClassAsWritten=*/SC_None, 6704 /*isInline=*/true, 6705 SourceLocation()); 6706 CopyAssignment->setAccess(AS_public); 6707 CopyAssignment->setDefaulted(); 6708 CopyAssignment->setImplicit(); 6709 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6710 6711 // Add the parameter to the operator. 6712 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6713 ClassLoc, ClassLoc, /*Id=*/0, 6714 ArgType, /*TInfo=*/0, 6715 SC_None, 6716 SC_None, 0); 6717 CopyAssignment->setParams(&FromParam, 1); 6718 6719 // Note that we have added this copy-assignment operator. 6720 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6721 6722 if (Scope *S = getScopeForContext(ClassDecl)) 6723 PushOnScopeChains(CopyAssignment, S, false); 6724 ClassDecl->addDecl(CopyAssignment); 6725 6726 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6727 CopyAssignment->setDeletedAsWritten(); 6728 6729 AddOverriddenMethods(ClassDecl, CopyAssignment); 6730 return CopyAssignment; 6731} 6732 6733void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6734 CXXMethodDecl *CopyAssignOperator) { 6735 assert((CopyAssignOperator->isDefaulted() && 6736 CopyAssignOperator->isOverloadedOperator() && 6737 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6738 !CopyAssignOperator->isUsed(false)) && 6739 "DefineImplicitCopyAssignment called for wrong function"); 6740 6741 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6742 6743 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6744 CopyAssignOperator->setInvalidDecl(); 6745 return; 6746 } 6747 6748 CopyAssignOperator->setUsed(); 6749 6750 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6751 DiagnosticErrorTrap Trap(Diags); 6752 6753 // C++0x [class.copy]p30: 6754 // The implicitly-defined or explicitly-defaulted copy assignment operator 6755 // for a non-union class X performs memberwise copy assignment of its 6756 // subobjects. The direct base classes of X are assigned first, in the 6757 // order of their declaration in the base-specifier-list, and then the 6758 // immediate non-static data members of X are assigned, in the order in 6759 // which they were declared in the class definition. 6760 6761 // The statements that form the synthesized function body. 6762 ASTOwningVector<Stmt*> Statements(*this); 6763 6764 // The parameter for the "other" object, which we are copying from. 6765 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6766 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6767 QualType OtherRefType = Other->getType(); 6768 if (const LValueReferenceType *OtherRef 6769 = OtherRefType->getAs<LValueReferenceType>()) { 6770 OtherRefType = OtherRef->getPointeeType(); 6771 OtherQuals = OtherRefType.getQualifiers(); 6772 } 6773 6774 // Our location for everything implicitly-generated. 6775 SourceLocation Loc = CopyAssignOperator->getLocation(); 6776 6777 // Construct a reference to the "other" object. We'll be using this 6778 // throughout the generated ASTs. 6779 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6780 assert(OtherRef && "Reference to parameter cannot fail!"); 6781 6782 // Construct the "this" pointer. We'll be using this throughout the generated 6783 // ASTs. 6784 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6785 assert(This && "Reference to this cannot fail!"); 6786 6787 // Assign base classes. 6788 bool Invalid = false; 6789 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6790 E = ClassDecl->bases_end(); Base != E; ++Base) { 6791 // Form the assignment: 6792 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6793 QualType BaseType = Base->getType().getUnqualifiedType(); 6794 if (!BaseType->isRecordType()) { 6795 Invalid = true; 6796 continue; 6797 } 6798 6799 CXXCastPath BasePath; 6800 BasePath.push_back(Base); 6801 6802 // Construct the "from" expression, which is an implicit cast to the 6803 // appropriately-qualified base type. 6804 Expr *From = OtherRef; 6805 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6806 CK_UncheckedDerivedToBase, 6807 VK_LValue, &BasePath).take(); 6808 6809 // Dereference "this". 6810 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6811 6812 // Implicitly cast "this" to the appropriately-qualified base type. 6813 To = ImpCastExprToType(To.take(), 6814 Context.getCVRQualifiedType(BaseType, 6815 CopyAssignOperator->getTypeQualifiers()), 6816 CK_UncheckedDerivedToBase, 6817 VK_LValue, &BasePath); 6818 6819 // Build the copy. 6820 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6821 To.get(), From, 6822 /*CopyingBaseSubobject=*/true); 6823 if (Copy.isInvalid()) { 6824 Diag(CurrentLocation, diag::note_member_synthesized_at) 6825 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6826 CopyAssignOperator->setInvalidDecl(); 6827 return; 6828 } 6829 6830 // Success! Record the copy. 6831 Statements.push_back(Copy.takeAs<Expr>()); 6832 } 6833 6834 // \brief Reference to the __builtin_memcpy function. 6835 Expr *BuiltinMemCpyRef = 0; 6836 // \brief Reference to the __builtin_objc_memmove_collectable function. 6837 Expr *CollectableMemCpyRef = 0; 6838 6839 // Assign non-static members. 6840 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6841 FieldEnd = ClassDecl->field_end(); 6842 Field != FieldEnd; ++Field) { 6843 // Check for members of reference type; we can't copy those. 6844 if (Field->getType()->isReferenceType()) { 6845 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6846 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6847 Diag(Field->getLocation(), diag::note_declared_at); 6848 Diag(CurrentLocation, diag::note_member_synthesized_at) 6849 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6850 Invalid = true; 6851 continue; 6852 } 6853 6854 // Check for members of const-qualified, non-class type. 6855 QualType BaseType = Context.getBaseElementType(Field->getType()); 6856 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6857 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6858 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6859 Diag(Field->getLocation(), diag::note_declared_at); 6860 Diag(CurrentLocation, diag::note_member_synthesized_at) 6861 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6862 Invalid = true; 6863 continue; 6864 } 6865 6866 QualType FieldType = Field->getType().getNonReferenceType(); 6867 if (FieldType->isIncompleteArrayType()) { 6868 assert(ClassDecl->hasFlexibleArrayMember() && 6869 "Incomplete array type is not valid"); 6870 continue; 6871 } 6872 6873 // Build references to the field in the object we're copying from and to. 6874 CXXScopeSpec SS; // Intentionally empty 6875 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6876 LookupMemberName); 6877 MemberLookup.addDecl(*Field); 6878 MemberLookup.resolveKind(); 6879 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6880 Loc, /*IsArrow=*/false, 6881 SS, 0, MemberLookup, 0); 6882 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6883 Loc, /*IsArrow=*/true, 6884 SS, 0, MemberLookup, 0); 6885 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6886 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6887 6888 // If the field should be copied with __builtin_memcpy rather than via 6889 // explicit assignments, do so. This optimization only applies for arrays 6890 // of scalars and arrays of class type with trivial copy-assignment 6891 // operators. 6892 if (FieldType->isArrayType() && 6893 (!BaseType->isRecordType() || 6894 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6895 ->hasTrivialCopyAssignment())) { 6896 // Compute the size of the memory buffer to be copied. 6897 QualType SizeType = Context.getSizeType(); 6898 llvm::APInt Size(Context.getTypeSize(SizeType), 6899 Context.getTypeSizeInChars(BaseType).getQuantity()); 6900 for (const ConstantArrayType *Array 6901 = Context.getAsConstantArrayType(FieldType); 6902 Array; 6903 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6904 llvm::APInt ArraySize 6905 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6906 Size *= ArraySize; 6907 } 6908 6909 // Take the address of the field references for "from" and "to". 6910 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6911 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6912 6913 bool NeedsCollectableMemCpy = 6914 (BaseType->isRecordType() && 6915 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6916 6917 if (NeedsCollectableMemCpy) { 6918 if (!CollectableMemCpyRef) { 6919 // Create a reference to the __builtin_objc_memmove_collectable function. 6920 LookupResult R(*this, 6921 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6922 Loc, LookupOrdinaryName); 6923 LookupName(R, TUScope, true); 6924 6925 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6926 if (!CollectableMemCpy) { 6927 // Something went horribly wrong earlier, and we will have 6928 // complained about it. 6929 Invalid = true; 6930 continue; 6931 } 6932 6933 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6934 CollectableMemCpy->getType(), 6935 VK_LValue, Loc, 0).take(); 6936 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6937 } 6938 } 6939 // Create a reference to the __builtin_memcpy builtin function. 6940 else if (!BuiltinMemCpyRef) { 6941 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6942 LookupOrdinaryName); 6943 LookupName(R, TUScope, true); 6944 6945 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6946 if (!BuiltinMemCpy) { 6947 // Something went horribly wrong earlier, and we will have complained 6948 // about it. 6949 Invalid = true; 6950 continue; 6951 } 6952 6953 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6954 BuiltinMemCpy->getType(), 6955 VK_LValue, Loc, 0).take(); 6956 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6957 } 6958 6959 ASTOwningVector<Expr*> CallArgs(*this); 6960 CallArgs.push_back(To.takeAs<Expr>()); 6961 CallArgs.push_back(From.takeAs<Expr>()); 6962 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6963 ExprResult Call = ExprError(); 6964 if (NeedsCollectableMemCpy) 6965 Call = ActOnCallExpr(/*Scope=*/0, 6966 CollectableMemCpyRef, 6967 Loc, move_arg(CallArgs), 6968 Loc); 6969 else 6970 Call = ActOnCallExpr(/*Scope=*/0, 6971 BuiltinMemCpyRef, 6972 Loc, move_arg(CallArgs), 6973 Loc); 6974 6975 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6976 Statements.push_back(Call.takeAs<Expr>()); 6977 continue; 6978 } 6979 6980 // Build the copy of this field. 6981 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6982 To.get(), From.get(), 6983 /*CopyingBaseSubobject=*/false); 6984 if (Copy.isInvalid()) { 6985 Diag(CurrentLocation, diag::note_member_synthesized_at) 6986 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6987 CopyAssignOperator->setInvalidDecl(); 6988 return; 6989 } 6990 6991 // Success! Record the copy. 6992 Statements.push_back(Copy.takeAs<Stmt>()); 6993 } 6994 6995 if (!Invalid) { 6996 // Add a "return *this;" 6997 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6998 6999 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7000 if (Return.isInvalid()) 7001 Invalid = true; 7002 else { 7003 Statements.push_back(Return.takeAs<Stmt>()); 7004 7005 if (Trap.hasErrorOccurred()) { 7006 Diag(CurrentLocation, diag::note_member_synthesized_at) 7007 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7008 Invalid = true; 7009 } 7010 } 7011 } 7012 7013 if (Invalid) { 7014 CopyAssignOperator->setInvalidDecl(); 7015 return; 7016 } 7017 7018 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7019 /*isStmtExpr=*/false); 7020 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7021 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7022 7023 if (ASTMutationListener *L = getASTMutationListener()) { 7024 L->CompletedImplicitDefinition(CopyAssignOperator); 7025 } 7026} 7027 7028std::pair<Sema::ImplicitExceptionSpecification, bool> 7029Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7030 // C++ [class.copy]p5: 7031 // The implicitly-declared copy constructor for a class X will 7032 // have the form 7033 // 7034 // X::X(const X&) 7035 // 7036 // if 7037 bool HasConstCopyConstructor = true; 7038 7039 // -- each direct or virtual base class B of X has a copy 7040 // constructor whose first parameter is of type const B& or 7041 // const volatile B&, and 7042 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7043 BaseEnd = ClassDecl->bases_end(); 7044 HasConstCopyConstructor && Base != BaseEnd; 7045 ++Base) { 7046 // Virtual bases are handled below. 7047 if (Base->isVirtual()) 7048 continue; 7049 7050 CXXRecordDecl *BaseClassDecl 7051 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7052 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7053 DeclareImplicitCopyConstructor(BaseClassDecl); 7054 7055 HasConstCopyConstructor 7056 = BaseClassDecl->hasConstCopyConstructor(Context); 7057 } 7058 7059 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7060 BaseEnd = ClassDecl->vbases_end(); 7061 HasConstCopyConstructor && Base != BaseEnd; 7062 ++Base) { 7063 CXXRecordDecl *BaseClassDecl 7064 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7065 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7066 DeclareImplicitCopyConstructor(BaseClassDecl); 7067 7068 HasConstCopyConstructor 7069 = BaseClassDecl->hasConstCopyConstructor(Context); 7070 } 7071 7072 // -- for all the nonstatic data members of X that are of a 7073 // class type M (or array thereof), each such class type 7074 // has a copy constructor whose first parameter is of type 7075 // const M& or const volatile M&. 7076 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7077 FieldEnd = ClassDecl->field_end(); 7078 HasConstCopyConstructor && Field != FieldEnd; 7079 ++Field) { 7080 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7081 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7082 CXXRecordDecl *FieldClassDecl 7083 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7084 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7085 DeclareImplicitCopyConstructor(FieldClassDecl); 7086 7087 HasConstCopyConstructor 7088 = FieldClassDecl->hasConstCopyConstructor(Context); 7089 } 7090 } 7091 // Otherwise, the implicitly declared copy constructor will have 7092 // the form 7093 // 7094 // X::X(X&) 7095 7096 // C++ [except.spec]p14: 7097 // An implicitly declared special member function (Clause 12) shall have an 7098 // exception-specification. [...] 7099 ImplicitExceptionSpecification ExceptSpec(Context); 7100 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7102 BaseEnd = ClassDecl->bases_end(); 7103 Base != BaseEnd; 7104 ++Base) { 7105 // Virtual bases are handled below. 7106 if (Base->isVirtual()) 7107 continue; 7108 7109 CXXRecordDecl *BaseClassDecl 7110 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7111 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7112 DeclareImplicitCopyConstructor(BaseClassDecl); 7113 7114 if (CXXConstructorDecl *CopyConstructor 7115 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7116 ExceptSpec.CalledDecl(CopyConstructor); 7117 } 7118 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7119 BaseEnd = ClassDecl->vbases_end(); 7120 Base != BaseEnd; 7121 ++Base) { 7122 CXXRecordDecl *BaseClassDecl 7123 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7124 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7125 DeclareImplicitCopyConstructor(BaseClassDecl); 7126 7127 if (CXXConstructorDecl *CopyConstructor 7128 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7129 ExceptSpec.CalledDecl(CopyConstructor); 7130 } 7131 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7132 FieldEnd = ClassDecl->field_end(); 7133 Field != FieldEnd; 7134 ++Field) { 7135 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7136 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7137 CXXRecordDecl *FieldClassDecl 7138 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7139 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7140 DeclareImplicitCopyConstructor(FieldClassDecl); 7141 7142 if (CXXConstructorDecl *CopyConstructor 7143 = FieldClassDecl->getCopyConstructor(Context, Quals)) 7144 ExceptSpec.CalledDecl(CopyConstructor); 7145 } 7146 } 7147 7148 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7149} 7150 7151CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7152 CXXRecordDecl *ClassDecl) { 7153 // C++ [class.copy]p4: 7154 // If the class definition does not explicitly declare a copy 7155 // constructor, one is declared implicitly. 7156 7157 ImplicitExceptionSpecification Spec(Context); 7158 bool Const; 7159 llvm::tie(Spec, Const) = 7160 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7161 7162 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7163 QualType ArgType = ClassType; 7164 if (Const) 7165 ArgType = ArgType.withConst(); 7166 ArgType = Context.getLValueReferenceType(ArgType); 7167 7168 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7169 7170 DeclarationName Name 7171 = Context.DeclarationNames.getCXXConstructorName( 7172 Context.getCanonicalType(ClassType)); 7173 SourceLocation ClassLoc = ClassDecl->getLocation(); 7174 DeclarationNameInfo NameInfo(Name, ClassLoc); 7175 7176 // An implicitly-declared copy constructor is an inline public 7177 // member of its class. 7178 CXXConstructorDecl *CopyConstructor 7179 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7180 Context.getFunctionType(Context.VoidTy, 7181 &ArgType, 1, EPI), 7182 /*TInfo=*/0, 7183 /*isExplicit=*/false, 7184 /*isInline=*/true, 7185 /*isImplicitlyDeclared=*/true); 7186 CopyConstructor->setAccess(AS_public); 7187 CopyConstructor->setDefaulted(); 7188 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7189 7190 // Note that we have declared this constructor. 7191 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7192 7193 // Add the parameter to the constructor. 7194 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7195 ClassLoc, ClassLoc, 7196 /*IdentifierInfo=*/0, 7197 ArgType, /*TInfo=*/0, 7198 SC_None, 7199 SC_None, 0); 7200 CopyConstructor->setParams(&FromParam, 1); 7201 7202 if (Scope *S = getScopeForContext(ClassDecl)) 7203 PushOnScopeChains(CopyConstructor, S, false); 7204 ClassDecl->addDecl(CopyConstructor); 7205 7206 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7207 CopyConstructor->setDeletedAsWritten(); 7208 7209 return CopyConstructor; 7210} 7211 7212void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7213 CXXConstructorDecl *CopyConstructor) { 7214 assert((CopyConstructor->isDefaulted() && 7215 CopyConstructor->isCopyConstructor() && 7216 !CopyConstructor->isUsed(false)) && 7217 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7218 7219 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7220 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7221 7222 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7223 DiagnosticErrorTrap Trap(Diags); 7224 7225 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7226 Trap.hasErrorOccurred()) { 7227 Diag(CurrentLocation, diag::note_member_synthesized_at) 7228 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7229 CopyConstructor->setInvalidDecl(); 7230 } else { 7231 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7232 CopyConstructor->getLocation(), 7233 MultiStmtArg(*this, 0, 0), 7234 /*isStmtExpr=*/false) 7235 .takeAs<Stmt>()); 7236 } 7237 7238 CopyConstructor->setUsed(); 7239 7240 if (ASTMutationListener *L = getASTMutationListener()) { 7241 L->CompletedImplicitDefinition(CopyConstructor); 7242 } 7243} 7244 7245ExprResult 7246Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7247 CXXConstructorDecl *Constructor, 7248 MultiExprArg ExprArgs, 7249 bool RequiresZeroInit, 7250 unsigned ConstructKind, 7251 SourceRange ParenRange) { 7252 bool Elidable = false; 7253 7254 // C++0x [class.copy]p34: 7255 // When certain criteria are met, an implementation is allowed to 7256 // omit the copy/move construction of a class object, even if the 7257 // copy/move constructor and/or destructor for the object have 7258 // side effects. [...] 7259 // - when a temporary class object that has not been bound to a 7260 // reference (12.2) would be copied/moved to a class object 7261 // with the same cv-unqualified type, the copy/move operation 7262 // can be omitted by constructing the temporary object 7263 // directly into the target of the omitted copy/move 7264 if (ConstructKind == CXXConstructExpr::CK_Complete && 7265 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7266 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7267 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7268 } 7269 7270 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7271 Elidable, move(ExprArgs), RequiresZeroInit, 7272 ConstructKind, ParenRange); 7273} 7274 7275/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7276/// including handling of its default argument expressions. 7277ExprResult 7278Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7279 CXXConstructorDecl *Constructor, bool Elidable, 7280 MultiExprArg ExprArgs, 7281 bool RequiresZeroInit, 7282 unsigned ConstructKind, 7283 SourceRange ParenRange) { 7284 unsigned NumExprs = ExprArgs.size(); 7285 Expr **Exprs = (Expr **)ExprArgs.release(); 7286 7287 for (specific_attr_iterator<NonNullAttr> 7288 i = Constructor->specific_attr_begin<NonNullAttr>(), 7289 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7290 const NonNullAttr *NonNull = *i; 7291 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7292 } 7293 7294 MarkDeclarationReferenced(ConstructLoc, Constructor); 7295 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7296 Constructor, Elidable, Exprs, NumExprs, 7297 RequiresZeroInit, 7298 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7299 ParenRange)); 7300} 7301 7302bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7303 CXXConstructorDecl *Constructor, 7304 MultiExprArg Exprs) { 7305 // FIXME: Provide the correct paren SourceRange when available. 7306 ExprResult TempResult = 7307 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7308 move(Exprs), false, CXXConstructExpr::CK_Complete, 7309 SourceRange()); 7310 if (TempResult.isInvalid()) 7311 return true; 7312 7313 Expr *Temp = TempResult.takeAs<Expr>(); 7314 CheckImplicitConversions(Temp, VD->getLocation()); 7315 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7316 Temp = MaybeCreateExprWithCleanups(Temp); 7317 VD->setInit(Temp); 7318 7319 return false; 7320} 7321 7322void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7323 if (VD->isInvalidDecl()) return; 7324 7325 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7326 if (ClassDecl->isInvalidDecl()) return; 7327 if (ClassDecl->hasTrivialDestructor()) return; 7328 if (ClassDecl->isDependentContext()) return; 7329 7330 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7331 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7332 CheckDestructorAccess(VD->getLocation(), Destructor, 7333 PDiag(diag::err_access_dtor_var) 7334 << VD->getDeclName() 7335 << VD->getType()); 7336 7337 if (!VD->hasGlobalStorage()) return; 7338 7339 // Emit warning for non-trivial dtor in global scope (a real global, 7340 // class-static, function-static). 7341 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7342 7343 // TODO: this should be re-enabled for static locals by !CXAAtExit 7344 if (!VD->isStaticLocal()) 7345 Diag(VD->getLocation(), diag::warn_global_destructor); 7346} 7347 7348/// AddCXXDirectInitializerToDecl - This action is called immediately after 7349/// ActOnDeclarator, when a C++ direct initializer is present. 7350/// e.g: "int x(1);" 7351void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7352 SourceLocation LParenLoc, 7353 MultiExprArg Exprs, 7354 SourceLocation RParenLoc, 7355 bool TypeMayContainAuto) { 7356 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7357 7358 // If there is no declaration, there was an error parsing it. Just ignore 7359 // the initializer. 7360 if (RealDecl == 0) 7361 return; 7362 7363 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7364 if (!VDecl) { 7365 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7366 RealDecl->setInvalidDecl(); 7367 return; 7368 } 7369 7370 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7371 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7372 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7373 if (Exprs.size() > 1) { 7374 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7375 diag::err_auto_var_init_multiple_expressions) 7376 << VDecl->getDeclName() << VDecl->getType() 7377 << VDecl->getSourceRange(); 7378 RealDecl->setInvalidDecl(); 7379 return; 7380 } 7381 7382 Expr *Init = Exprs.get()[0]; 7383 TypeSourceInfo *DeducedType = 0; 7384 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7385 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7386 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7387 << Init->getSourceRange(); 7388 if (!DeducedType) { 7389 RealDecl->setInvalidDecl(); 7390 return; 7391 } 7392 VDecl->setTypeSourceInfo(DeducedType); 7393 VDecl->setType(DeducedType->getType()); 7394 7395 // If this is a redeclaration, check that the type we just deduced matches 7396 // the previously declared type. 7397 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7398 MergeVarDeclTypes(VDecl, Old); 7399 } 7400 7401 // We will represent direct-initialization similarly to copy-initialization: 7402 // int x(1); -as-> int x = 1; 7403 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7404 // 7405 // Clients that want to distinguish between the two forms, can check for 7406 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7407 // A major benefit is that clients that don't particularly care about which 7408 // exactly form was it (like the CodeGen) can handle both cases without 7409 // special case code. 7410 7411 // C++ 8.5p11: 7412 // The form of initialization (using parentheses or '=') is generally 7413 // insignificant, but does matter when the entity being initialized has a 7414 // class type. 7415 7416 if (!VDecl->getType()->isDependentType() && 7417 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7418 diag::err_typecheck_decl_incomplete_type)) { 7419 VDecl->setInvalidDecl(); 7420 return; 7421 } 7422 7423 // The variable can not have an abstract class type. 7424 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7425 diag::err_abstract_type_in_decl, 7426 AbstractVariableType)) 7427 VDecl->setInvalidDecl(); 7428 7429 const VarDecl *Def; 7430 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7431 Diag(VDecl->getLocation(), diag::err_redefinition) 7432 << VDecl->getDeclName(); 7433 Diag(Def->getLocation(), diag::note_previous_definition); 7434 VDecl->setInvalidDecl(); 7435 return; 7436 } 7437 7438 // C++ [class.static.data]p4 7439 // If a static data member is of const integral or const 7440 // enumeration type, its declaration in the class definition can 7441 // specify a constant-initializer which shall be an integral 7442 // constant expression (5.19). In that case, the member can appear 7443 // in integral constant expressions. The member shall still be 7444 // defined in a namespace scope if it is used in the program and the 7445 // namespace scope definition shall not contain an initializer. 7446 // 7447 // We already performed a redefinition check above, but for static 7448 // data members we also need to check whether there was an in-class 7449 // declaration with an initializer. 7450 const VarDecl* PrevInit = 0; 7451 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7452 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7453 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7454 return; 7455 } 7456 7457 bool IsDependent = false; 7458 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7459 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7460 VDecl->setInvalidDecl(); 7461 return; 7462 } 7463 7464 if (Exprs.get()[I]->isTypeDependent()) 7465 IsDependent = true; 7466 } 7467 7468 // If either the declaration has a dependent type or if any of the 7469 // expressions is type-dependent, we represent the initialization 7470 // via a ParenListExpr for later use during template instantiation. 7471 if (VDecl->getType()->isDependentType() || IsDependent) { 7472 // Let clients know that initialization was done with a direct initializer. 7473 VDecl->setCXXDirectInitializer(true); 7474 7475 // Store the initialization expressions as a ParenListExpr. 7476 unsigned NumExprs = Exprs.size(); 7477 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7478 (Expr **)Exprs.release(), 7479 NumExprs, RParenLoc)); 7480 return; 7481 } 7482 7483 // Capture the variable that is being initialized and the style of 7484 // initialization. 7485 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7486 7487 // FIXME: Poor source location information. 7488 InitializationKind Kind 7489 = InitializationKind::CreateDirect(VDecl->getLocation(), 7490 LParenLoc, RParenLoc); 7491 7492 InitializationSequence InitSeq(*this, Entity, Kind, 7493 Exprs.get(), Exprs.size()); 7494 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7495 if (Result.isInvalid()) { 7496 VDecl->setInvalidDecl(); 7497 return; 7498 } 7499 7500 CheckImplicitConversions(Result.get(), LParenLoc); 7501 7502 Result = MaybeCreateExprWithCleanups(Result); 7503 VDecl->setInit(Result.takeAs<Expr>()); 7504 VDecl->setCXXDirectInitializer(true); 7505 7506 CheckCompleteVariableDeclaration(VDecl); 7507} 7508 7509/// \brief Given a constructor and the set of arguments provided for the 7510/// constructor, convert the arguments and add any required default arguments 7511/// to form a proper call to this constructor. 7512/// 7513/// \returns true if an error occurred, false otherwise. 7514bool 7515Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7516 MultiExprArg ArgsPtr, 7517 SourceLocation Loc, 7518 ASTOwningVector<Expr*> &ConvertedArgs) { 7519 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7520 unsigned NumArgs = ArgsPtr.size(); 7521 Expr **Args = (Expr **)ArgsPtr.get(); 7522 7523 const FunctionProtoType *Proto 7524 = Constructor->getType()->getAs<FunctionProtoType>(); 7525 assert(Proto && "Constructor without a prototype?"); 7526 unsigned NumArgsInProto = Proto->getNumArgs(); 7527 7528 // If too few arguments are available, we'll fill in the rest with defaults. 7529 if (NumArgs < NumArgsInProto) 7530 ConvertedArgs.reserve(NumArgsInProto); 7531 else 7532 ConvertedArgs.reserve(NumArgs); 7533 7534 VariadicCallType CallType = 7535 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7536 llvm::SmallVector<Expr *, 8> AllArgs; 7537 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7538 Proto, 0, Args, NumArgs, AllArgs, 7539 CallType); 7540 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7541 ConvertedArgs.push_back(AllArgs[i]); 7542 return Invalid; 7543} 7544 7545static inline bool 7546CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7547 const FunctionDecl *FnDecl) { 7548 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7549 if (isa<NamespaceDecl>(DC)) { 7550 return SemaRef.Diag(FnDecl->getLocation(), 7551 diag::err_operator_new_delete_declared_in_namespace) 7552 << FnDecl->getDeclName(); 7553 } 7554 7555 if (isa<TranslationUnitDecl>(DC) && 7556 FnDecl->getStorageClass() == SC_Static) { 7557 return SemaRef.Diag(FnDecl->getLocation(), 7558 diag::err_operator_new_delete_declared_static) 7559 << FnDecl->getDeclName(); 7560 } 7561 7562 return false; 7563} 7564 7565static inline bool 7566CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7567 CanQualType ExpectedResultType, 7568 CanQualType ExpectedFirstParamType, 7569 unsigned DependentParamTypeDiag, 7570 unsigned InvalidParamTypeDiag) { 7571 QualType ResultType = 7572 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7573 7574 // Check that the result type is not dependent. 7575 if (ResultType->isDependentType()) 7576 return SemaRef.Diag(FnDecl->getLocation(), 7577 diag::err_operator_new_delete_dependent_result_type) 7578 << FnDecl->getDeclName() << ExpectedResultType; 7579 7580 // Check that the result type is what we expect. 7581 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7582 return SemaRef.Diag(FnDecl->getLocation(), 7583 diag::err_operator_new_delete_invalid_result_type) 7584 << FnDecl->getDeclName() << ExpectedResultType; 7585 7586 // A function template must have at least 2 parameters. 7587 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7588 return SemaRef.Diag(FnDecl->getLocation(), 7589 diag::err_operator_new_delete_template_too_few_parameters) 7590 << FnDecl->getDeclName(); 7591 7592 // The function decl must have at least 1 parameter. 7593 if (FnDecl->getNumParams() == 0) 7594 return SemaRef.Diag(FnDecl->getLocation(), 7595 diag::err_operator_new_delete_too_few_parameters) 7596 << FnDecl->getDeclName(); 7597 7598 // Check the the first parameter type is not dependent. 7599 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7600 if (FirstParamType->isDependentType()) 7601 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7602 << FnDecl->getDeclName() << ExpectedFirstParamType; 7603 7604 // Check that the first parameter type is what we expect. 7605 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7606 ExpectedFirstParamType) 7607 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7608 << FnDecl->getDeclName() << ExpectedFirstParamType; 7609 7610 return false; 7611} 7612 7613static bool 7614CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7615 // C++ [basic.stc.dynamic.allocation]p1: 7616 // A program is ill-formed if an allocation function is declared in a 7617 // namespace scope other than global scope or declared static in global 7618 // scope. 7619 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7620 return true; 7621 7622 CanQualType SizeTy = 7623 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7624 7625 // C++ [basic.stc.dynamic.allocation]p1: 7626 // The return type shall be void*. The first parameter shall have type 7627 // std::size_t. 7628 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7629 SizeTy, 7630 diag::err_operator_new_dependent_param_type, 7631 diag::err_operator_new_param_type)) 7632 return true; 7633 7634 // C++ [basic.stc.dynamic.allocation]p1: 7635 // The first parameter shall not have an associated default argument. 7636 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7637 return SemaRef.Diag(FnDecl->getLocation(), 7638 diag::err_operator_new_default_arg) 7639 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7640 7641 return false; 7642} 7643 7644static bool 7645CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7646 // C++ [basic.stc.dynamic.deallocation]p1: 7647 // A program is ill-formed if deallocation functions are declared in a 7648 // namespace scope other than global scope or declared static in global 7649 // scope. 7650 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7651 return true; 7652 7653 // C++ [basic.stc.dynamic.deallocation]p2: 7654 // Each deallocation function shall return void and its first parameter 7655 // shall be void*. 7656 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7657 SemaRef.Context.VoidPtrTy, 7658 diag::err_operator_delete_dependent_param_type, 7659 diag::err_operator_delete_param_type)) 7660 return true; 7661 7662 return false; 7663} 7664 7665/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7666/// of this overloaded operator is well-formed. If so, returns false; 7667/// otherwise, emits appropriate diagnostics and returns true. 7668bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7669 assert(FnDecl && FnDecl->isOverloadedOperator() && 7670 "Expected an overloaded operator declaration"); 7671 7672 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7673 7674 // C++ [over.oper]p5: 7675 // The allocation and deallocation functions, operator new, 7676 // operator new[], operator delete and operator delete[], are 7677 // described completely in 3.7.3. The attributes and restrictions 7678 // found in the rest of this subclause do not apply to them unless 7679 // explicitly stated in 3.7.3. 7680 if (Op == OO_Delete || Op == OO_Array_Delete) 7681 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7682 7683 if (Op == OO_New || Op == OO_Array_New) 7684 return CheckOperatorNewDeclaration(*this, FnDecl); 7685 7686 // C++ [over.oper]p6: 7687 // An operator function shall either be a non-static member 7688 // function or be a non-member function and have at least one 7689 // parameter whose type is a class, a reference to a class, an 7690 // enumeration, or a reference to an enumeration. 7691 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7692 if (MethodDecl->isStatic()) 7693 return Diag(FnDecl->getLocation(), 7694 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7695 } else { 7696 bool ClassOrEnumParam = false; 7697 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7698 ParamEnd = FnDecl->param_end(); 7699 Param != ParamEnd; ++Param) { 7700 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7701 if (ParamType->isDependentType() || ParamType->isRecordType() || 7702 ParamType->isEnumeralType()) { 7703 ClassOrEnumParam = true; 7704 break; 7705 } 7706 } 7707 7708 if (!ClassOrEnumParam) 7709 return Diag(FnDecl->getLocation(), 7710 diag::err_operator_overload_needs_class_or_enum) 7711 << FnDecl->getDeclName(); 7712 } 7713 7714 // C++ [over.oper]p8: 7715 // An operator function cannot have default arguments (8.3.6), 7716 // except where explicitly stated below. 7717 // 7718 // Only the function-call operator allows default arguments 7719 // (C++ [over.call]p1). 7720 if (Op != OO_Call) { 7721 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7722 Param != FnDecl->param_end(); ++Param) { 7723 if ((*Param)->hasDefaultArg()) 7724 return Diag((*Param)->getLocation(), 7725 diag::err_operator_overload_default_arg) 7726 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7727 } 7728 } 7729 7730 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7731 { false, false, false } 7732#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7733 , { Unary, Binary, MemberOnly } 7734#include "clang/Basic/OperatorKinds.def" 7735 }; 7736 7737 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7738 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7739 bool MustBeMemberOperator = OperatorUses[Op][2]; 7740 7741 // C++ [over.oper]p8: 7742 // [...] Operator functions cannot have more or fewer parameters 7743 // than the number required for the corresponding operator, as 7744 // described in the rest of this subclause. 7745 unsigned NumParams = FnDecl->getNumParams() 7746 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7747 if (Op != OO_Call && 7748 ((NumParams == 1 && !CanBeUnaryOperator) || 7749 (NumParams == 2 && !CanBeBinaryOperator) || 7750 (NumParams < 1) || (NumParams > 2))) { 7751 // We have the wrong number of parameters. 7752 unsigned ErrorKind; 7753 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7754 ErrorKind = 2; // 2 -> unary or binary. 7755 } else if (CanBeUnaryOperator) { 7756 ErrorKind = 0; // 0 -> unary 7757 } else { 7758 assert(CanBeBinaryOperator && 7759 "All non-call overloaded operators are unary or binary!"); 7760 ErrorKind = 1; // 1 -> binary 7761 } 7762 7763 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7764 << FnDecl->getDeclName() << NumParams << ErrorKind; 7765 } 7766 7767 // Overloaded operators other than operator() cannot be variadic. 7768 if (Op != OO_Call && 7769 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7770 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7771 << FnDecl->getDeclName(); 7772 } 7773 7774 // Some operators must be non-static member functions. 7775 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7776 return Diag(FnDecl->getLocation(), 7777 diag::err_operator_overload_must_be_member) 7778 << FnDecl->getDeclName(); 7779 } 7780 7781 // C++ [over.inc]p1: 7782 // The user-defined function called operator++ implements the 7783 // prefix and postfix ++ operator. If this function is a member 7784 // function with no parameters, or a non-member function with one 7785 // parameter of class or enumeration type, it defines the prefix 7786 // increment operator ++ for objects of that type. If the function 7787 // is a member function with one parameter (which shall be of type 7788 // int) or a non-member function with two parameters (the second 7789 // of which shall be of type int), it defines the postfix 7790 // increment operator ++ for objects of that type. 7791 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7792 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7793 bool ParamIsInt = false; 7794 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7795 ParamIsInt = BT->getKind() == BuiltinType::Int; 7796 7797 if (!ParamIsInt) 7798 return Diag(LastParam->getLocation(), 7799 diag::err_operator_overload_post_incdec_must_be_int) 7800 << LastParam->getType() << (Op == OO_MinusMinus); 7801 } 7802 7803 return false; 7804} 7805 7806/// CheckLiteralOperatorDeclaration - Check whether the declaration 7807/// of this literal operator function is well-formed. If so, returns 7808/// false; otherwise, emits appropriate diagnostics and returns true. 7809bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7810 DeclContext *DC = FnDecl->getDeclContext(); 7811 Decl::Kind Kind = DC->getDeclKind(); 7812 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7813 Kind != Decl::LinkageSpec) { 7814 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7815 << FnDecl->getDeclName(); 7816 return true; 7817 } 7818 7819 bool Valid = false; 7820 7821 // template <char...> type operator "" name() is the only valid template 7822 // signature, and the only valid signature with no parameters. 7823 if (FnDecl->param_size() == 0) { 7824 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7825 // Must have only one template parameter 7826 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7827 if (Params->size() == 1) { 7828 NonTypeTemplateParmDecl *PmDecl = 7829 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7830 7831 // The template parameter must be a char parameter pack. 7832 if (PmDecl && PmDecl->isTemplateParameterPack() && 7833 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7834 Valid = true; 7835 } 7836 } 7837 } else { 7838 // Check the first parameter 7839 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7840 7841 QualType T = (*Param)->getType(); 7842 7843 // unsigned long long int, long double, and any character type are allowed 7844 // as the only parameters. 7845 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7846 Context.hasSameType(T, Context.LongDoubleTy) || 7847 Context.hasSameType(T, Context.CharTy) || 7848 Context.hasSameType(T, Context.WCharTy) || 7849 Context.hasSameType(T, Context.Char16Ty) || 7850 Context.hasSameType(T, Context.Char32Ty)) { 7851 if (++Param == FnDecl->param_end()) 7852 Valid = true; 7853 goto FinishedParams; 7854 } 7855 7856 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7857 const PointerType *PT = T->getAs<PointerType>(); 7858 if (!PT) 7859 goto FinishedParams; 7860 T = PT->getPointeeType(); 7861 if (!T.isConstQualified()) 7862 goto FinishedParams; 7863 T = T.getUnqualifiedType(); 7864 7865 // Move on to the second parameter; 7866 ++Param; 7867 7868 // If there is no second parameter, the first must be a const char * 7869 if (Param == FnDecl->param_end()) { 7870 if (Context.hasSameType(T, Context.CharTy)) 7871 Valid = true; 7872 goto FinishedParams; 7873 } 7874 7875 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7876 // are allowed as the first parameter to a two-parameter function 7877 if (!(Context.hasSameType(T, Context.CharTy) || 7878 Context.hasSameType(T, Context.WCharTy) || 7879 Context.hasSameType(T, Context.Char16Ty) || 7880 Context.hasSameType(T, Context.Char32Ty))) 7881 goto FinishedParams; 7882 7883 // The second and final parameter must be an std::size_t 7884 T = (*Param)->getType().getUnqualifiedType(); 7885 if (Context.hasSameType(T, Context.getSizeType()) && 7886 ++Param == FnDecl->param_end()) 7887 Valid = true; 7888 } 7889 7890 // FIXME: This diagnostic is absolutely terrible. 7891FinishedParams: 7892 if (!Valid) { 7893 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7894 << FnDecl->getDeclName(); 7895 return true; 7896 } 7897 7898 return false; 7899} 7900 7901/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7902/// linkage specification, including the language and (if present) 7903/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7904/// the location of the language string literal, which is provided 7905/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7906/// the '{' brace. Otherwise, this linkage specification does not 7907/// have any braces. 7908Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7909 SourceLocation LangLoc, 7910 llvm::StringRef Lang, 7911 SourceLocation LBraceLoc) { 7912 LinkageSpecDecl::LanguageIDs Language; 7913 if (Lang == "\"C\"") 7914 Language = LinkageSpecDecl::lang_c; 7915 else if (Lang == "\"C++\"") 7916 Language = LinkageSpecDecl::lang_cxx; 7917 else { 7918 Diag(LangLoc, diag::err_bad_language); 7919 return 0; 7920 } 7921 7922 // FIXME: Add all the various semantics of linkage specifications 7923 7924 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7925 ExternLoc, LangLoc, Language); 7926 CurContext->addDecl(D); 7927 PushDeclContext(S, D); 7928 return D; 7929} 7930 7931/// ActOnFinishLinkageSpecification - Complete the definition of 7932/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7933/// valid, it's the position of the closing '}' brace in a linkage 7934/// specification that uses braces. 7935Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7936 Decl *LinkageSpec, 7937 SourceLocation RBraceLoc) { 7938 if (LinkageSpec) { 7939 if (RBraceLoc.isValid()) { 7940 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7941 LSDecl->setRBraceLoc(RBraceLoc); 7942 } 7943 PopDeclContext(); 7944 } 7945 return LinkageSpec; 7946} 7947 7948/// \brief Perform semantic analysis for the variable declaration that 7949/// occurs within a C++ catch clause, returning the newly-created 7950/// variable. 7951VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7952 TypeSourceInfo *TInfo, 7953 SourceLocation StartLoc, 7954 SourceLocation Loc, 7955 IdentifierInfo *Name) { 7956 bool Invalid = false; 7957 QualType ExDeclType = TInfo->getType(); 7958 7959 // Arrays and functions decay. 7960 if (ExDeclType->isArrayType()) 7961 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7962 else if (ExDeclType->isFunctionType()) 7963 ExDeclType = Context.getPointerType(ExDeclType); 7964 7965 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7966 // The exception-declaration shall not denote a pointer or reference to an 7967 // incomplete type, other than [cv] void*. 7968 // N2844 forbids rvalue references. 7969 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7970 Diag(Loc, diag::err_catch_rvalue_ref); 7971 Invalid = true; 7972 } 7973 7974 // GCC allows catching pointers and references to incomplete types 7975 // as an extension; so do we, but we warn by default. 7976 7977 QualType BaseType = ExDeclType; 7978 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7979 unsigned DK = diag::err_catch_incomplete; 7980 bool IncompleteCatchIsInvalid = true; 7981 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7982 BaseType = Ptr->getPointeeType(); 7983 Mode = 1; 7984 DK = diag::ext_catch_incomplete_ptr; 7985 IncompleteCatchIsInvalid = false; 7986 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7987 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7988 BaseType = Ref->getPointeeType(); 7989 Mode = 2; 7990 DK = diag::ext_catch_incomplete_ref; 7991 IncompleteCatchIsInvalid = false; 7992 } 7993 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7994 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7995 IncompleteCatchIsInvalid) 7996 Invalid = true; 7997 7998 if (!Invalid && !ExDeclType->isDependentType() && 7999 RequireNonAbstractType(Loc, ExDeclType, 8000 diag::err_abstract_type_in_decl, 8001 AbstractVariableType)) 8002 Invalid = true; 8003 8004 // Only the non-fragile NeXT runtime currently supports C++ catches 8005 // of ObjC types, and no runtime supports catching ObjC types by value. 8006 if (!Invalid && getLangOptions().ObjC1) { 8007 QualType T = ExDeclType; 8008 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8009 T = RT->getPointeeType(); 8010 8011 if (T->isObjCObjectType()) { 8012 Diag(Loc, diag::err_objc_object_catch); 8013 Invalid = true; 8014 } else if (T->isObjCObjectPointerType()) { 8015 if (!getLangOptions().ObjCNonFragileABI) { 8016 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 8017 Invalid = true; 8018 } 8019 } 8020 } 8021 8022 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8023 ExDeclType, TInfo, SC_None, SC_None); 8024 ExDecl->setExceptionVariable(true); 8025 8026 if (!Invalid) { 8027 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8028 // C++ [except.handle]p16: 8029 // The object declared in an exception-declaration or, if the 8030 // exception-declaration does not specify a name, a temporary (12.2) is 8031 // copy-initialized (8.5) from the exception object. [...] 8032 // The object is destroyed when the handler exits, after the destruction 8033 // of any automatic objects initialized within the handler. 8034 // 8035 // We just pretend to initialize the object with itself, then make sure 8036 // it can be destroyed later. 8037 QualType initType = ExDeclType; 8038 8039 InitializedEntity entity = 8040 InitializedEntity::InitializeVariable(ExDecl); 8041 InitializationKind initKind = 8042 InitializationKind::CreateCopy(Loc, SourceLocation()); 8043 8044 Expr *opaqueValue = 8045 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8046 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8047 ExprResult result = sequence.Perform(*this, entity, initKind, 8048 MultiExprArg(&opaqueValue, 1)); 8049 if (result.isInvalid()) 8050 Invalid = true; 8051 else { 8052 // If the constructor used was non-trivial, set this as the 8053 // "initializer". 8054 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8055 if (!construct->getConstructor()->isTrivial()) { 8056 Expr *init = MaybeCreateExprWithCleanups(construct); 8057 ExDecl->setInit(init); 8058 } 8059 8060 // And make sure it's destructable. 8061 FinalizeVarWithDestructor(ExDecl, recordType); 8062 } 8063 } 8064 } 8065 8066 if (Invalid) 8067 ExDecl->setInvalidDecl(); 8068 8069 return ExDecl; 8070} 8071 8072/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8073/// handler. 8074Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8075 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8076 bool Invalid = D.isInvalidType(); 8077 8078 // Check for unexpanded parameter packs. 8079 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8080 UPPC_ExceptionType)) { 8081 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8082 D.getIdentifierLoc()); 8083 Invalid = true; 8084 } 8085 8086 IdentifierInfo *II = D.getIdentifier(); 8087 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8088 LookupOrdinaryName, 8089 ForRedeclaration)) { 8090 // The scope should be freshly made just for us. There is just no way 8091 // it contains any previous declaration. 8092 assert(!S->isDeclScope(PrevDecl)); 8093 if (PrevDecl->isTemplateParameter()) { 8094 // Maybe we will complain about the shadowed template parameter. 8095 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8096 } 8097 } 8098 8099 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8100 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8101 << D.getCXXScopeSpec().getRange(); 8102 Invalid = true; 8103 } 8104 8105 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8106 D.getSourceRange().getBegin(), 8107 D.getIdentifierLoc(), 8108 D.getIdentifier()); 8109 if (Invalid) 8110 ExDecl->setInvalidDecl(); 8111 8112 // Add the exception declaration into this scope. 8113 if (II) 8114 PushOnScopeChains(ExDecl, S); 8115 else 8116 CurContext->addDecl(ExDecl); 8117 8118 ProcessDeclAttributes(S, ExDecl, D); 8119 return ExDecl; 8120} 8121 8122Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8123 Expr *AssertExpr, 8124 Expr *AssertMessageExpr_, 8125 SourceLocation RParenLoc) { 8126 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8127 8128 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8129 llvm::APSInt Value(32); 8130 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8131 Diag(StaticAssertLoc, 8132 diag::err_static_assert_expression_is_not_constant) << 8133 AssertExpr->getSourceRange(); 8134 return 0; 8135 } 8136 8137 if (Value == 0) { 8138 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8139 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8140 } 8141 } 8142 8143 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8144 return 0; 8145 8146 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8147 AssertExpr, AssertMessage, RParenLoc); 8148 8149 CurContext->addDecl(Decl); 8150 return Decl; 8151} 8152 8153/// \brief Perform semantic analysis of the given friend type declaration. 8154/// 8155/// \returns A friend declaration that. 8156FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8157 TypeSourceInfo *TSInfo) { 8158 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8159 8160 QualType T = TSInfo->getType(); 8161 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8162 8163 if (!getLangOptions().CPlusPlus0x) { 8164 // C++03 [class.friend]p2: 8165 // An elaborated-type-specifier shall be used in a friend declaration 8166 // for a class.* 8167 // 8168 // * The class-key of the elaborated-type-specifier is required. 8169 if (!ActiveTemplateInstantiations.empty()) { 8170 // Do not complain about the form of friend template types during 8171 // template instantiation; we will already have complained when the 8172 // template was declared. 8173 } else if (!T->isElaboratedTypeSpecifier()) { 8174 // If we evaluated the type to a record type, suggest putting 8175 // a tag in front. 8176 if (const RecordType *RT = T->getAs<RecordType>()) { 8177 RecordDecl *RD = RT->getDecl(); 8178 8179 std::string InsertionText = std::string(" ") + RD->getKindName(); 8180 8181 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8182 << (unsigned) RD->getTagKind() 8183 << T 8184 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8185 InsertionText); 8186 } else { 8187 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8188 << T 8189 << SourceRange(FriendLoc, TypeRange.getEnd()); 8190 } 8191 } else if (T->getAs<EnumType>()) { 8192 Diag(FriendLoc, diag::ext_enum_friend) 8193 << T 8194 << SourceRange(FriendLoc, TypeRange.getEnd()); 8195 } 8196 } 8197 8198 // C++0x [class.friend]p3: 8199 // If the type specifier in a friend declaration designates a (possibly 8200 // cv-qualified) class type, that class is declared as a friend; otherwise, 8201 // the friend declaration is ignored. 8202 8203 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8204 // in [class.friend]p3 that we do not implement. 8205 8206 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8207} 8208 8209/// Handle a friend tag declaration where the scope specifier was 8210/// templated. 8211Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8212 unsigned TagSpec, SourceLocation TagLoc, 8213 CXXScopeSpec &SS, 8214 IdentifierInfo *Name, SourceLocation NameLoc, 8215 AttributeList *Attr, 8216 MultiTemplateParamsArg TempParamLists) { 8217 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8218 8219 bool isExplicitSpecialization = false; 8220 bool Invalid = false; 8221 8222 if (TemplateParameterList *TemplateParams 8223 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8224 TempParamLists.get(), 8225 TempParamLists.size(), 8226 /*friend*/ true, 8227 isExplicitSpecialization, 8228 Invalid)) { 8229 if (TemplateParams->size() > 0) { 8230 // This is a declaration of a class template. 8231 if (Invalid) 8232 return 0; 8233 8234 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8235 SS, Name, NameLoc, Attr, 8236 TemplateParams, AS_public, 8237 TempParamLists.size() - 1, 8238 (TemplateParameterList**) TempParamLists.release()).take(); 8239 } else { 8240 // The "template<>" header is extraneous. 8241 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8242 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8243 isExplicitSpecialization = true; 8244 } 8245 } 8246 8247 if (Invalid) return 0; 8248 8249 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8250 8251 bool isAllExplicitSpecializations = true; 8252 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8253 if (TempParamLists.get()[I]->size()) { 8254 isAllExplicitSpecializations = false; 8255 break; 8256 } 8257 } 8258 8259 // FIXME: don't ignore attributes. 8260 8261 // If it's explicit specializations all the way down, just forget 8262 // about the template header and build an appropriate non-templated 8263 // friend. TODO: for source fidelity, remember the headers. 8264 if (isAllExplicitSpecializations) { 8265 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8266 ElaboratedTypeKeyword Keyword 8267 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8268 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8269 *Name, NameLoc); 8270 if (T.isNull()) 8271 return 0; 8272 8273 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8274 if (isa<DependentNameType>(T)) { 8275 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8276 TL.setKeywordLoc(TagLoc); 8277 TL.setQualifierLoc(QualifierLoc); 8278 TL.setNameLoc(NameLoc); 8279 } else { 8280 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8281 TL.setKeywordLoc(TagLoc); 8282 TL.setQualifierLoc(QualifierLoc); 8283 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8284 } 8285 8286 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8287 TSI, FriendLoc); 8288 Friend->setAccess(AS_public); 8289 CurContext->addDecl(Friend); 8290 return Friend; 8291 } 8292 8293 // Handle the case of a templated-scope friend class. e.g. 8294 // template <class T> class A<T>::B; 8295 // FIXME: we don't support these right now. 8296 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8297 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8298 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8299 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8300 TL.setKeywordLoc(TagLoc); 8301 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8302 TL.setNameLoc(NameLoc); 8303 8304 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8305 TSI, FriendLoc); 8306 Friend->setAccess(AS_public); 8307 Friend->setUnsupportedFriend(true); 8308 CurContext->addDecl(Friend); 8309 return Friend; 8310} 8311 8312 8313/// Handle a friend type declaration. This works in tandem with 8314/// ActOnTag. 8315/// 8316/// Notes on friend class templates: 8317/// 8318/// We generally treat friend class declarations as if they were 8319/// declaring a class. So, for example, the elaborated type specifier 8320/// in a friend declaration is required to obey the restrictions of a 8321/// class-head (i.e. no typedefs in the scope chain), template 8322/// parameters are required to match up with simple template-ids, &c. 8323/// However, unlike when declaring a template specialization, it's 8324/// okay to refer to a template specialization without an empty 8325/// template parameter declaration, e.g. 8326/// friend class A<T>::B<unsigned>; 8327/// We permit this as a special case; if there are any template 8328/// parameters present at all, require proper matching, i.e. 8329/// template <> template <class T> friend class A<int>::B; 8330Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8331 MultiTemplateParamsArg TempParams) { 8332 SourceLocation Loc = DS.getSourceRange().getBegin(); 8333 8334 assert(DS.isFriendSpecified()); 8335 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8336 8337 // Try to convert the decl specifier to a type. This works for 8338 // friend templates because ActOnTag never produces a ClassTemplateDecl 8339 // for a TUK_Friend. 8340 Declarator TheDeclarator(DS, Declarator::MemberContext); 8341 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8342 QualType T = TSI->getType(); 8343 if (TheDeclarator.isInvalidType()) 8344 return 0; 8345 8346 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8347 return 0; 8348 8349 // This is definitely an error in C++98. It's probably meant to 8350 // be forbidden in C++0x, too, but the specification is just 8351 // poorly written. 8352 // 8353 // The problem is with declarations like the following: 8354 // template <T> friend A<T>::foo; 8355 // where deciding whether a class C is a friend or not now hinges 8356 // on whether there exists an instantiation of A that causes 8357 // 'foo' to equal C. There are restrictions on class-heads 8358 // (which we declare (by fiat) elaborated friend declarations to 8359 // be) that makes this tractable. 8360 // 8361 // FIXME: handle "template <> friend class A<T>;", which 8362 // is possibly well-formed? Who even knows? 8363 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8364 Diag(Loc, diag::err_tagless_friend_type_template) 8365 << DS.getSourceRange(); 8366 return 0; 8367 } 8368 8369 // C++98 [class.friend]p1: A friend of a class is a function 8370 // or class that is not a member of the class . . . 8371 // This is fixed in DR77, which just barely didn't make the C++03 8372 // deadline. It's also a very silly restriction that seriously 8373 // affects inner classes and which nobody else seems to implement; 8374 // thus we never diagnose it, not even in -pedantic. 8375 // 8376 // But note that we could warn about it: it's always useless to 8377 // friend one of your own members (it's not, however, worthless to 8378 // friend a member of an arbitrary specialization of your template). 8379 8380 Decl *D; 8381 if (unsigned NumTempParamLists = TempParams.size()) 8382 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8383 NumTempParamLists, 8384 TempParams.release(), 8385 TSI, 8386 DS.getFriendSpecLoc()); 8387 else 8388 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8389 8390 if (!D) 8391 return 0; 8392 8393 D->setAccess(AS_public); 8394 CurContext->addDecl(D); 8395 8396 return D; 8397} 8398 8399Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8400 MultiTemplateParamsArg TemplateParams) { 8401 const DeclSpec &DS = D.getDeclSpec(); 8402 8403 assert(DS.isFriendSpecified()); 8404 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8405 8406 SourceLocation Loc = D.getIdentifierLoc(); 8407 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8408 QualType T = TInfo->getType(); 8409 8410 // C++ [class.friend]p1 8411 // A friend of a class is a function or class.... 8412 // Note that this sees through typedefs, which is intended. 8413 // It *doesn't* see through dependent types, which is correct 8414 // according to [temp.arg.type]p3: 8415 // If a declaration acquires a function type through a 8416 // type dependent on a template-parameter and this causes 8417 // a declaration that does not use the syntactic form of a 8418 // function declarator to have a function type, the program 8419 // is ill-formed. 8420 if (!T->isFunctionType()) { 8421 Diag(Loc, diag::err_unexpected_friend); 8422 8423 // It might be worthwhile to try to recover by creating an 8424 // appropriate declaration. 8425 return 0; 8426 } 8427 8428 // C++ [namespace.memdef]p3 8429 // - If a friend declaration in a non-local class first declares a 8430 // class or function, the friend class or function is a member 8431 // of the innermost enclosing namespace. 8432 // - The name of the friend is not found by simple name lookup 8433 // until a matching declaration is provided in that namespace 8434 // scope (either before or after the class declaration granting 8435 // friendship). 8436 // - If a friend function is called, its name may be found by the 8437 // name lookup that considers functions from namespaces and 8438 // classes associated with the types of the function arguments. 8439 // - When looking for a prior declaration of a class or a function 8440 // declared as a friend, scopes outside the innermost enclosing 8441 // namespace scope are not considered. 8442 8443 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8444 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8445 DeclarationName Name = NameInfo.getName(); 8446 assert(Name); 8447 8448 // Check for unexpanded parameter packs. 8449 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8450 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8451 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8452 return 0; 8453 8454 // The context we found the declaration in, or in which we should 8455 // create the declaration. 8456 DeclContext *DC; 8457 Scope *DCScope = S; 8458 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8459 ForRedeclaration); 8460 8461 // FIXME: there are different rules in local classes 8462 8463 // There are four cases here. 8464 // - There's no scope specifier, in which case we just go to the 8465 // appropriate scope and look for a function or function template 8466 // there as appropriate. 8467 // Recover from invalid scope qualifiers as if they just weren't there. 8468 if (SS.isInvalid() || !SS.isSet()) { 8469 // C++0x [namespace.memdef]p3: 8470 // If the name in a friend declaration is neither qualified nor 8471 // a template-id and the declaration is a function or an 8472 // elaborated-type-specifier, the lookup to determine whether 8473 // the entity has been previously declared shall not consider 8474 // any scopes outside the innermost enclosing namespace. 8475 // C++0x [class.friend]p11: 8476 // If a friend declaration appears in a local class and the name 8477 // specified is an unqualified name, a prior declaration is 8478 // looked up without considering scopes that are outside the 8479 // innermost enclosing non-class scope. For a friend function 8480 // declaration, if there is no prior declaration, the program is 8481 // ill-formed. 8482 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8483 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8484 8485 // Find the appropriate context according to the above. 8486 DC = CurContext; 8487 while (true) { 8488 // Skip class contexts. If someone can cite chapter and verse 8489 // for this behavior, that would be nice --- it's what GCC and 8490 // EDG do, and it seems like a reasonable intent, but the spec 8491 // really only says that checks for unqualified existing 8492 // declarations should stop at the nearest enclosing namespace, 8493 // not that they should only consider the nearest enclosing 8494 // namespace. 8495 while (DC->isRecord()) 8496 DC = DC->getParent(); 8497 8498 LookupQualifiedName(Previous, DC); 8499 8500 // TODO: decide what we think about using declarations. 8501 if (isLocal || !Previous.empty()) 8502 break; 8503 8504 if (isTemplateId) { 8505 if (isa<TranslationUnitDecl>(DC)) break; 8506 } else { 8507 if (DC->isFileContext()) break; 8508 } 8509 DC = DC->getParent(); 8510 } 8511 8512 // C++ [class.friend]p1: A friend of a class is a function or 8513 // class that is not a member of the class . . . 8514 // C++0x changes this for both friend types and functions. 8515 // Most C++ 98 compilers do seem to give an error here, so 8516 // we do, too. 8517 if (!Previous.empty() && DC->Equals(CurContext) 8518 && !getLangOptions().CPlusPlus0x) 8519 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8520 8521 DCScope = getScopeForDeclContext(S, DC); 8522 8523 // - There's a non-dependent scope specifier, in which case we 8524 // compute it and do a previous lookup there for a function 8525 // or function template. 8526 } else if (!SS.getScopeRep()->isDependent()) { 8527 DC = computeDeclContext(SS); 8528 if (!DC) return 0; 8529 8530 if (RequireCompleteDeclContext(SS, DC)) return 0; 8531 8532 LookupQualifiedName(Previous, DC); 8533 8534 // Ignore things found implicitly in the wrong scope. 8535 // TODO: better diagnostics for this case. Suggesting the right 8536 // qualified scope would be nice... 8537 LookupResult::Filter F = Previous.makeFilter(); 8538 while (F.hasNext()) { 8539 NamedDecl *D = F.next(); 8540 if (!DC->InEnclosingNamespaceSetOf( 8541 D->getDeclContext()->getRedeclContext())) 8542 F.erase(); 8543 } 8544 F.done(); 8545 8546 if (Previous.empty()) { 8547 D.setInvalidType(); 8548 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8549 return 0; 8550 } 8551 8552 // C++ [class.friend]p1: A friend of a class is a function or 8553 // class that is not a member of the class . . . 8554 if (DC->Equals(CurContext)) 8555 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8556 8557 // - There's a scope specifier that does not match any template 8558 // parameter lists, in which case we use some arbitrary context, 8559 // create a method or method template, and wait for instantiation. 8560 // - There's a scope specifier that does match some template 8561 // parameter lists, which we don't handle right now. 8562 } else { 8563 DC = CurContext; 8564 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8565 } 8566 8567 if (!DC->isRecord()) { 8568 // This implies that it has to be an operator or function. 8569 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8570 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8571 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8572 Diag(Loc, diag::err_introducing_special_friend) << 8573 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8574 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8575 return 0; 8576 } 8577 } 8578 8579 bool Redeclaration = false; 8580 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8581 move(TemplateParams), 8582 IsDefinition, 8583 Redeclaration); 8584 if (!ND) return 0; 8585 8586 assert(ND->getDeclContext() == DC); 8587 assert(ND->getLexicalDeclContext() == CurContext); 8588 8589 // Add the function declaration to the appropriate lookup tables, 8590 // adjusting the redeclarations list as necessary. We don't 8591 // want to do this yet if the friending class is dependent. 8592 // 8593 // Also update the scope-based lookup if the target context's 8594 // lookup context is in lexical scope. 8595 if (!CurContext->isDependentContext()) { 8596 DC = DC->getRedeclContext(); 8597 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8598 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8599 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8600 } 8601 8602 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8603 D.getIdentifierLoc(), ND, 8604 DS.getFriendSpecLoc()); 8605 FrD->setAccess(AS_public); 8606 CurContext->addDecl(FrD); 8607 8608 if (ND->isInvalidDecl()) 8609 FrD->setInvalidDecl(); 8610 else { 8611 FunctionDecl *FD; 8612 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8613 FD = FTD->getTemplatedDecl(); 8614 else 8615 FD = cast<FunctionDecl>(ND); 8616 8617 // Mark templated-scope function declarations as unsupported. 8618 if (FD->getNumTemplateParameterLists()) 8619 FrD->setUnsupportedFriend(true); 8620 } 8621 8622 return ND; 8623} 8624 8625void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8626 AdjustDeclIfTemplate(Dcl); 8627 8628 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8629 if (!Fn) { 8630 Diag(DelLoc, diag::err_deleted_non_function); 8631 return; 8632 } 8633 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8634 Diag(DelLoc, diag::err_deleted_decl_not_first); 8635 Diag(Prev->getLocation(), diag::note_previous_declaration); 8636 // If the declaration wasn't the first, we delete the function anyway for 8637 // recovery. 8638 } 8639 Fn->setDeletedAsWritten(); 8640} 8641 8642void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8643 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8644 8645 if (MD) { 8646 CXXSpecialMember Member = getSpecialMember(MD); 8647 if (Member == CXXInvalid) { 8648 Diag(DefaultLoc, diag::err_default_special_members); 8649 return; 8650 } 8651 8652 MD->setDefaulted(); 8653 MD->setExplicitlyDefaulted(); 8654 8655 // We'll check it when the record is done 8656 if (MD == MD->getCanonicalDecl()) 8657 return; 8658 8659 switch (Member) { 8660 case CXXDefaultConstructor: { 8661 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8662 CheckExplicitlyDefaultedDefaultConstructor(CD); 8663 if (!CD->isInvalidDecl()) 8664 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8665 break; 8666 } 8667 8668 case CXXCopyConstructor: { 8669 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8670 CheckExplicitlyDefaultedCopyConstructor(CD); 8671 if (!CD->isInvalidDecl()) 8672 DefineImplicitCopyConstructor(DefaultLoc, CD); 8673 break; 8674 } 8675 8676 case CXXCopyAssignment: { 8677 CheckExplicitlyDefaultedCopyAssignment(MD); 8678 if (!MD->isInvalidDecl()) 8679 DefineImplicitCopyAssignment(DefaultLoc, MD); 8680 break; 8681 } 8682 8683 case CXXDestructor: { 8684 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8685 CheckExplicitlyDefaultedDestructor(DD); 8686 if (!DD->isInvalidDecl()) 8687 DefineImplicitDestructor(DefaultLoc, DD); 8688 break; 8689 } 8690 8691 default: 8692 // FIXME: Do the rest once we have move functions 8693 break; 8694 } 8695 } else { 8696 Diag(DefaultLoc, diag::err_default_special_members); 8697 } 8698} 8699 8700static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8701 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8702 Stmt *SubStmt = *CI; 8703 if (!SubStmt) 8704 continue; 8705 if (isa<ReturnStmt>(SubStmt)) 8706 Self.Diag(SubStmt->getSourceRange().getBegin(), 8707 diag::err_return_in_constructor_handler); 8708 if (!isa<Expr>(SubStmt)) 8709 SearchForReturnInStmt(Self, SubStmt); 8710 } 8711} 8712 8713void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8714 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8715 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8716 SearchForReturnInStmt(*this, Handler); 8717 } 8718} 8719 8720bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8721 const CXXMethodDecl *Old) { 8722 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8723 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8724 8725 if (Context.hasSameType(NewTy, OldTy) || 8726 NewTy->isDependentType() || OldTy->isDependentType()) 8727 return false; 8728 8729 // Check if the return types are covariant 8730 QualType NewClassTy, OldClassTy; 8731 8732 /// Both types must be pointers or references to classes. 8733 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8734 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8735 NewClassTy = NewPT->getPointeeType(); 8736 OldClassTy = OldPT->getPointeeType(); 8737 } 8738 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8739 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8740 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8741 NewClassTy = NewRT->getPointeeType(); 8742 OldClassTy = OldRT->getPointeeType(); 8743 } 8744 } 8745 } 8746 8747 // The return types aren't either both pointers or references to a class type. 8748 if (NewClassTy.isNull()) { 8749 Diag(New->getLocation(), 8750 diag::err_different_return_type_for_overriding_virtual_function) 8751 << New->getDeclName() << NewTy << OldTy; 8752 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8753 8754 return true; 8755 } 8756 8757 // C++ [class.virtual]p6: 8758 // If the return type of D::f differs from the return type of B::f, the 8759 // class type in the return type of D::f shall be complete at the point of 8760 // declaration of D::f or shall be the class type D. 8761 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8762 if (!RT->isBeingDefined() && 8763 RequireCompleteType(New->getLocation(), NewClassTy, 8764 PDiag(diag::err_covariant_return_incomplete) 8765 << New->getDeclName())) 8766 return true; 8767 } 8768 8769 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8770 // Check if the new class derives from the old class. 8771 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8772 Diag(New->getLocation(), 8773 diag::err_covariant_return_not_derived) 8774 << New->getDeclName() << NewTy << OldTy; 8775 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8776 return true; 8777 } 8778 8779 // Check if we the conversion from derived to base is valid. 8780 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8781 diag::err_covariant_return_inaccessible_base, 8782 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8783 // FIXME: Should this point to the return type? 8784 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8785 // FIXME: this note won't trigger for delayed access control 8786 // diagnostics, and it's impossible to get an undelayed error 8787 // here from access control during the original parse because 8788 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8789 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8790 return true; 8791 } 8792 } 8793 8794 // The qualifiers of the return types must be the same. 8795 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8796 Diag(New->getLocation(), 8797 diag::err_covariant_return_type_different_qualifications) 8798 << New->getDeclName() << NewTy << OldTy; 8799 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8800 return true; 8801 }; 8802 8803 8804 // The new class type must have the same or less qualifiers as the old type. 8805 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8806 Diag(New->getLocation(), 8807 diag::err_covariant_return_type_class_type_more_qualified) 8808 << New->getDeclName() << NewTy << OldTy; 8809 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8810 return true; 8811 }; 8812 8813 return false; 8814} 8815 8816/// \brief Mark the given method pure. 8817/// 8818/// \param Method the method to be marked pure. 8819/// 8820/// \param InitRange the source range that covers the "0" initializer. 8821bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8822 SourceLocation EndLoc = InitRange.getEnd(); 8823 if (EndLoc.isValid()) 8824 Method->setRangeEnd(EndLoc); 8825 8826 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8827 Method->setPure(); 8828 return false; 8829 } 8830 8831 if (!Method->isInvalidDecl()) 8832 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8833 << Method->getDeclName() << InitRange; 8834 return true; 8835} 8836 8837/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8838/// an initializer for the out-of-line declaration 'Dcl'. The scope 8839/// is a fresh scope pushed for just this purpose. 8840/// 8841/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8842/// static data member of class X, names should be looked up in the scope of 8843/// class X. 8844void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8845 // If there is no declaration, there was an error parsing it. 8846 if (D == 0 || D->isInvalidDecl()) return; 8847 8848 // We should only get called for declarations with scope specifiers, like: 8849 // int foo::bar; 8850 assert(D->isOutOfLine()); 8851 EnterDeclaratorContext(S, D->getDeclContext()); 8852} 8853 8854/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8855/// initializer for the out-of-line declaration 'D'. 8856void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8857 // If there is no declaration, there was an error parsing it. 8858 if (D == 0 || D->isInvalidDecl()) return; 8859 8860 assert(D->isOutOfLine()); 8861 ExitDeclaratorContext(S); 8862} 8863 8864/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8865/// C++ if/switch/while/for statement. 8866/// e.g: "if (int x = f()) {...}" 8867DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8868 // C++ 6.4p2: 8869 // The declarator shall not specify a function or an array. 8870 // The type-specifier-seq shall not contain typedef and shall not declare a 8871 // new class or enumeration. 8872 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8873 "Parser allowed 'typedef' as storage class of condition decl."); 8874 8875 TagDecl *OwnedTag = 0; 8876 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8877 QualType Ty = TInfo->getType(); 8878 8879 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8880 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8881 // would be created and CXXConditionDeclExpr wants a VarDecl. 8882 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8883 << D.getSourceRange(); 8884 return DeclResult(); 8885 } else if (OwnedTag && OwnedTag->isDefinition()) { 8886 // The type-specifier-seq shall not declare a new class or enumeration. 8887 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8888 } 8889 8890 Decl *Dcl = ActOnDeclarator(S, D); 8891 if (!Dcl) 8892 return DeclResult(); 8893 8894 return Dcl; 8895} 8896 8897void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8898 bool DefinitionRequired) { 8899 // Ignore any vtable uses in unevaluated operands or for classes that do 8900 // not have a vtable. 8901 if (!Class->isDynamicClass() || Class->isDependentContext() || 8902 CurContext->isDependentContext() || 8903 ExprEvalContexts.back().Context == Unevaluated) 8904 return; 8905 8906 // Try to insert this class into the map. 8907 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8908 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8909 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8910 if (!Pos.second) { 8911 // If we already had an entry, check to see if we are promoting this vtable 8912 // to required a definition. If so, we need to reappend to the VTableUses 8913 // list, since we may have already processed the first entry. 8914 if (DefinitionRequired && !Pos.first->second) { 8915 Pos.first->second = true; 8916 } else { 8917 // Otherwise, we can early exit. 8918 return; 8919 } 8920 } 8921 8922 // Local classes need to have their virtual members marked 8923 // immediately. For all other classes, we mark their virtual members 8924 // at the end of the translation unit. 8925 if (Class->isLocalClass()) 8926 MarkVirtualMembersReferenced(Loc, Class); 8927 else 8928 VTableUses.push_back(std::make_pair(Class, Loc)); 8929} 8930 8931bool Sema::DefineUsedVTables() { 8932 if (VTableUses.empty()) 8933 return false; 8934 8935 // Note: The VTableUses vector could grow as a result of marking 8936 // the members of a class as "used", so we check the size each 8937 // time through the loop and prefer indices (with are stable) to 8938 // iterators (which are not). 8939 bool DefinedAnything = false; 8940 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8941 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8942 if (!Class) 8943 continue; 8944 8945 SourceLocation Loc = VTableUses[I].second; 8946 8947 // If this class has a key function, but that key function is 8948 // defined in another translation unit, we don't need to emit the 8949 // vtable even though we're using it. 8950 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8951 if (KeyFunction && !KeyFunction->hasBody()) { 8952 switch (KeyFunction->getTemplateSpecializationKind()) { 8953 case TSK_Undeclared: 8954 case TSK_ExplicitSpecialization: 8955 case TSK_ExplicitInstantiationDeclaration: 8956 // The key function is in another translation unit. 8957 continue; 8958 8959 case TSK_ExplicitInstantiationDefinition: 8960 case TSK_ImplicitInstantiation: 8961 // We will be instantiating the key function. 8962 break; 8963 } 8964 } else if (!KeyFunction) { 8965 // If we have a class with no key function that is the subject 8966 // of an explicit instantiation declaration, suppress the 8967 // vtable; it will live with the explicit instantiation 8968 // definition. 8969 bool IsExplicitInstantiationDeclaration 8970 = Class->getTemplateSpecializationKind() 8971 == TSK_ExplicitInstantiationDeclaration; 8972 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8973 REnd = Class->redecls_end(); 8974 R != REnd; ++R) { 8975 TemplateSpecializationKind TSK 8976 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8977 if (TSK == TSK_ExplicitInstantiationDeclaration) 8978 IsExplicitInstantiationDeclaration = true; 8979 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8980 IsExplicitInstantiationDeclaration = false; 8981 break; 8982 } 8983 } 8984 8985 if (IsExplicitInstantiationDeclaration) 8986 continue; 8987 } 8988 8989 // Mark all of the virtual members of this class as referenced, so 8990 // that we can build a vtable. Then, tell the AST consumer that a 8991 // vtable for this class is required. 8992 DefinedAnything = true; 8993 MarkVirtualMembersReferenced(Loc, Class); 8994 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8995 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8996 8997 // Optionally warn if we're emitting a weak vtable. 8998 if (Class->getLinkage() == ExternalLinkage && 8999 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9000 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9001 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9002 } 9003 } 9004 VTableUses.clear(); 9005 9006 return DefinedAnything; 9007} 9008 9009void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9010 const CXXRecordDecl *RD) { 9011 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9012 e = RD->method_end(); i != e; ++i) { 9013 CXXMethodDecl *MD = *i; 9014 9015 // C++ [basic.def.odr]p2: 9016 // [...] A virtual member function is used if it is not pure. [...] 9017 if (MD->isVirtual() && !MD->isPure()) 9018 MarkDeclarationReferenced(Loc, MD); 9019 } 9020 9021 // Only classes that have virtual bases need a VTT. 9022 if (RD->getNumVBases() == 0) 9023 return; 9024 9025 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9026 e = RD->bases_end(); i != e; ++i) { 9027 const CXXRecordDecl *Base = 9028 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9029 if (Base->getNumVBases() == 0) 9030 continue; 9031 MarkVirtualMembersReferenced(Loc, Base); 9032 } 9033} 9034 9035/// SetIvarInitializers - This routine builds initialization ASTs for the 9036/// Objective-C implementation whose ivars need be initialized. 9037void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9038 if (!getLangOptions().CPlusPlus) 9039 return; 9040 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9041 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9042 CollectIvarsToConstructOrDestruct(OID, ivars); 9043 if (ivars.empty()) 9044 return; 9045 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9046 for (unsigned i = 0; i < ivars.size(); i++) { 9047 FieldDecl *Field = ivars[i]; 9048 if (Field->isInvalidDecl()) 9049 continue; 9050 9051 CXXCtorInitializer *Member; 9052 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9053 InitializationKind InitKind = 9054 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9055 9056 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9057 ExprResult MemberInit = 9058 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9059 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9060 // Note, MemberInit could actually come back empty if no initialization 9061 // is required (e.g., because it would call a trivial default constructor) 9062 if (!MemberInit.get() || MemberInit.isInvalid()) 9063 continue; 9064 9065 Member = 9066 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9067 SourceLocation(), 9068 MemberInit.takeAs<Expr>(), 9069 SourceLocation()); 9070 AllToInit.push_back(Member); 9071 9072 // Be sure that the destructor is accessible and is marked as referenced. 9073 if (const RecordType *RecordTy 9074 = Context.getBaseElementType(Field->getType()) 9075 ->getAs<RecordType>()) { 9076 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9077 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9078 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9079 CheckDestructorAccess(Field->getLocation(), Destructor, 9080 PDiag(diag::err_access_dtor_ivar) 9081 << Context.getBaseElementType(Field->getType())); 9082 } 9083 } 9084 } 9085 ObjCImplementation->setIvarInitializers(Context, 9086 AllToInit.data(), AllToInit.size()); 9087 } 9088} 9089 9090static 9091void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9092 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9093 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9094 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9095 Sema &S) { 9096 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9097 CE = Current.end(); 9098 if (Ctor->isInvalidDecl()) 9099 return; 9100 9101 const FunctionDecl *FNTarget = 0; 9102 CXXConstructorDecl *Target; 9103 9104 // We ignore the result here since if we don't have a body, Target will be 9105 // null below. 9106 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9107 Target 9108= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9109 9110 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9111 // Avoid dereferencing a null pointer here. 9112 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9113 9114 if (!Current.insert(Canonical)) 9115 return; 9116 9117 // We know that beyond here, we aren't chaining into a cycle. 9118 if (!Target || !Target->isDelegatingConstructor() || 9119 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9120 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9121 Valid.insert(*CI); 9122 Current.clear(); 9123 // We've hit a cycle. 9124 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9125 Current.count(TCanonical)) { 9126 // If we haven't diagnosed this cycle yet, do so now. 9127 if (!Invalid.count(TCanonical)) { 9128 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9129 diag::warn_delegating_ctor_cycle) 9130 << Ctor; 9131 9132 // Don't add a note for a function delegating directo to itself. 9133 if (TCanonical != Canonical) 9134 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9135 9136 CXXConstructorDecl *C = Target; 9137 while (C->getCanonicalDecl() != Canonical) { 9138 (void)C->getTargetConstructor()->hasBody(FNTarget); 9139 assert(FNTarget && "Ctor cycle through bodiless function"); 9140 9141 C 9142 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9143 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9144 } 9145 } 9146 9147 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9148 Invalid.insert(*CI); 9149 Current.clear(); 9150 } else { 9151 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9152 } 9153} 9154 9155 9156void Sema::CheckDelegatingCtorCycles() { 9157 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9158 9159 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9160 CE = Current.end(); 9161 9162 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9163 I = DelegatingCtorDecls.begin(), 9164 E = DelegatingCtorDecls.end(); 9165 I != E; ++I) { 9166 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9167 } 9168 9169 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9170 (*CI)->setInvalidDecl(); 9171} 9172