SemaDeclCXX.cpp revision 2b188085eccf741a9520ba86f1e6e32d0e0cd3f2
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 (FieldBaseElementType->isReferenceType()) { 2021 SemaRef.Diag(Constructor->getLocation(), 2022 diag::err_uninitialized_member_in_ctor) 2023 << (int)Constructor->isImplicit() 2024 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2025 << 0 << Field->getDeclName(); 2026 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2027 return true; 2028 } 2029 2030 if (FieldBaseElementType.isConstQualified()) { 2031 SemaRef.Diag(Constructor->getLocation(), 2032 diag::err_uninitialized_member_in_ctor) 2033 << (int)Constructor->isImplicit() 2034 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2035 << 1 << Field->getDeclName(); 2036 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2037 return true; 2038 } 2039 2040 // Nothing to initialize. 2041 CXXMemberInit = 0; 2042 return false; 2043} 2044 2045namespace { 2046struct BaseAndFieldInfo { 2047 Sema &S; 2048 CXXConstructorDecl *Ctor; 2049 bool AnyErrorsInInits; 2050 ImplicitInitializerKind IIK; 2051 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2052 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2053 2054 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2055 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2056 // FIXME: Handle implicit move constructors. 2057 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2058 IIK = IIK_Copy; 2059 else 2060 IIK = IIK_Default; 2061 } 2062}; 2063} 2064 2065static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2066 FieldDecl *Top, FieldDecl *Field) { 2067 2068 // Overwhelmingly common case: we have a direct initializer for this field. 2069 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2070 Info.AllToInit.push_back(Init); 2071 return false; 2072 } 2073 2074 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2075 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2076 assert(FieldClassType && "anonymous struct/union without record type"); 2077 CXXRecordDecl *FieldClassDecl 2078 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2079 2080 // Even though union members never have non-trivial default 2081 // constructions in C++03, we still build member initializers for aggregate 2082 // record types which can be union members, and C++0x allows non-trivial 2083 // default constructors for union members, so we ensure that only one 2084 // member is initialized for these. 2085 if (FieldClassDecl->isUnion()) { 2086 // First check for an explicit initializer for one field. 2087 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2088 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2089 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2090 Info.AllToInit.push_back(Init); 2091 2092 // Once we've initialized a field of an anonymous union, the union 2093 // field in the class is also initialized, so exit immediately. 2094 return false; 2095 } else if ((*FA)->isAnonymousStructOrUnion()) { 2096 if (CollectFieldInitializer(Info, Top, *FA)) 2097 return true; 2098 } 2099 } 2100 2101 // Fallthrough and construct a default initializer for the union as 2102 // a whole, which can call its default constructor if such a thing exists 2103 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2104 // behavior going forward with C++0x, when anonymous unions there are 2105 // finalized, we should revisit this. 2106 } else { 2107 // For structs, we simply descend through to initialize all members where 2108 // necessary. 2109 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2110 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2111 if (CollectFieldInitializer(Info, Top, *FA)) 2112 return true; 2113 } 2114 } 2115 } 2116 2117 // Don't try to build an implicit initializer if there were semantic 2118 // errors in any of the initializers (and therefore we might be 2119 // missing some that the user actually wrote). 2120 if (Info.AnyErrorsInInits) 2121 return false; 2122 2123 CXXCtorInitializer *Init = 0; 2124 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2125 return true; 2126 2127 if (Init) 2128 Info.AllToInit.push_back(Init); 2129 2130 return false; 2131} 2132 2133bool 2134Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2135 CXXCtorInitializer *Initializer) { 2136 assert(Initializer->isDelegatingInitializer()); 2137 Constructor->setNumCtorInitializers(1); 2138 CXXCtorInitializer **initializer = 2139 new (Context) CXXCtorInitializer*[1]; 2140 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2141 Constructor->setCtorInitializers(initializer); 2142 2143 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2144 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2145 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2146 } 2147 2148 DelegatingCtorDecls.push_back(Constructor); 2149 2150 return false; 2151} 2152 2153bool 2154Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2155 CXXCtorInitializer **Initializers, 2156 unsigned NumInitializers, 2157 bool AnyErrors) { 2158 if (Constructor->getDeclContext()->isDependentContext()) { 2159 // Just store the initializers as written, they will be checked during 2160 // instantiation. 2161 if (NumInitializers > 0) { 2162 Constructor->setNumCtorInitializers(NumInitializers); 2163 CXXCtorInitializer **baseOrMemberInitializers = 2164 new (Context) CXXCtorInitializer*[NumInitializers]; 2165 memcpy(baseOrMemberInitializers, Initializers, 2166 NumInitializers * sizeof(CXXCtorInitializer*)); 2167 Constructor->setCtorInitializers(baseOrMemberInitializers); 2168 } 2169 2170 return false; 2171 } 2172 2173 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2174 2175 // We need to build the initializer AST according to order of construction 2176 // and not what user specified in the Initializers list. 2177 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2178 if (!ClassDecl) 2179 return true; 2180 2181 bool HadError = false; 2182 2183 for (unsigned i = 0; i < NumInitializers; i++) { 2184 CXXCtorInitializer *Member = Initializers[i]; 2185 2186 if (Member->isBaseInitializer()) 2187 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2188 else 2189 Info.AllBaseFields[Member->getAnyMember()] = Member; 2190 } 2191 2192 // Keep track of the direct virtual bases. 2193 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2194 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2195 E = ClassDecl->bases_end(); I != E; ++I) { 2196 if (I->isVirtual()) 2197 DirectVBases.insert(I); 2198 } 2199 2200 // Push virtual bases before others. 2201 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2202 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2203 2204 if (CXXCtorInitializer *Value 2205 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2206 Info.AllToInit.push_back(Value); 2207 } else if (!AnyErrors) { 2208 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2209 CXXCtorInitializer *CXXBaseInit; 2210 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2211 VBase, IsInheritedVirtualBase, 2212 CXXBaseInit)) { 2213 HadError = true; 2214 continue; 2215 } 2216 2217 Info.AllToInit.push_back(CXXBaseInit); 2218 } 2219 } 2220 2221 // Non-virtual bases. 2222 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2223 E = ClassDecl->bases_end(); Base != E; ++Base) { 2224 // Virtuals are in the virtual base list and already constructed. 2225 if (Base->isVirtual()) 2226 continue; 2227 2228 if (CXXCtorInitializer *Value 2229 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2230 Info.AllToInit.push_back(Value); 2231 } else if (!AnyErrors) { 2232 CXXCtorInitializer *CXXBaseInit; 2233 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2234 Base, /*IsInheritedVirtualBase=*/false, 2235 CXXBaseInit)) { 2236 HadError = true; 2237 continue; 2238 } 2239 2240 Info.AllToInit.push_back(CXXBaseInit); 2241 } 2242 } 2243 2244 // Fields. 2245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2246 E = ClassDecl->field_end(); Field != E; ++Field) { 2247 if ((*Field)->getType()->isIncompleteArrayType()) { 2248 assert(ClassDecl->hasFlexibleArrayMember() && 2249 "Incomplete array type is not valid"); 2250 continue; 2251 } 2252 if (CollectFieldInitializer(Info, *Field, *Field)) 2253 HadError = true; 2254 } 2255 2256 NumInitializers = Info.AllToInit.size(); 2257 if (NumInitializers > 0) { 2258 Constructor->setNumCtorInitializers(NumInitializers); 2259 CXXCtorInitializer **baseOrMemberInitializers = 2260 new (Context) CXXCtorInitializer*[NumInitializers]; 2261 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2262 NumInitializers * sizeof(CXXCtorInitializer*)); 2263 Constructor->setCtorInitializers(baseOrMemberInitializers); 2264 2265 // Constructors implicitly reference the base and member 2266 // destructors. 2267 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2268 Constructor->getParent()); 2269 } 2270 2271 return HadError; 2272} 2273 2274static void *GetKeyForTopLevelField(FieldDecl *Field) { 2275 // For anonymous unions, use the class declaration as the key. 2276 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2277 if (RT->getDecl()->isAnonymousStructOrUnion()) 2278 return static_cast<void *>(RT->getDecl()); 2279 } 2280 return static_cast<void *>(Field); 2281} 2282 2283static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2284 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2285} 2286 2287static void *GetKeyForMember(ASTContext &Context, 2288 CXXCtorInitializer *Member) { 2289 if (!Member->isAnyMemberInitializer()) 2290 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2291 2292 // For fields injected into the class via declaration of an anonymous union, 2293 // use its anonymous union class declaration as the unique key. 2294 FieldDecl *Field = Member->getAnyMember(); 2295 2296 // If the field is a member of an anonymous struct or union, our key 2297 // is the anonymous record decl that's a direct child of the class. 2298 RecordDecl *RD = Field->getParent(); 2299 if (RD->isAnonymousStructOrUnion()) { 2300 while (true) { 2301 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2302 if (Parent->isAnonymousStructOrUnion()) 2303 RD = Parent; 2304 else 2305 break; 2306 } 2307 2308 return static_cast<void *>(RD); 2309 } 2310 2311 return static_cast<void *>(Field); 2312} 2313 2314static void 2315DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2316 const CXXConstructorDecl *Constructor, 2317 CXXCtorInitializer **Inits, 2318 unsigned NumInits) { 2319 if (Constructor->getDeclContext()->isDependentContext()) 2320 return; 2321 2322 // Don't check initializers order unless the warning is enabled at the 2323 // location of at least one initializer. 2324 bool ShouldCheckOrder = false; 2325 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2326 CXXCtorInitializer *Init = Inits[InitIndex]; 2327 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2328 Init->getSourceLocation()) 2329 != Diagnostic::Ignored) { 2330 ShouldCheckOrder = true; 2331 break; 2332 } 2333 } 2334 if (!ShouldCheckOrder) 2335 return; 2336 2337 // Build the list of bases and members in the order that they'll 2338 // actually be initialized. The explicit initializers should be in 2339 // this same order but may be missing things. 2340 llvm::SmallVector<const void*, 32> IdealInitKeys; 2341 2342 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2343 2344 // 1. Virtual bases. 2345 for (CXXRecordDecl::base_class_const_iterator VBase = 2346 ClassDecl->vbases_begin(), 2347 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2348 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2349 2350 // 2. Non-virtual bases. 2351 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2352 E = ClassDecl->bases_end(); Base != E; ++Base) { 2353 if (Base->isVirtual()) 2354 continue; 2355 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2356 } 2357 2358 // 3. Direct fields. 2359 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2360 E = ClassDecl->field_end(); Field != E; ++Field) 2361 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2362 2363 unsigned NumIdealInits = IdealInitKeys.size(); 2364 unsigned IdealIndex = 0; 2365 2366 CXXCtorInitializer *PrevInit = 0; 2367 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2368 CXXCtorInitializer *Init = Inits[InitIndex]; 2369 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2370 2371 // Scan forward to try to find this initializer in the idealized 2372 // initializers list. 2373 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2374 if (InitKey == IdealInitKeys[IdealIndex]) 2375 break; 2376 2377 // If we didn't find this initializer, it must be because we 2378 // scanned past it on a previous iteration. That can only 2379 // happen if we're out of order; emit a warning. 2380 if (IdealIndex == NumIdealInits && PrevInit) { 2381 Sema::SemaDiagnosticBuilder D = 2382 SemaRef.Diag(PrevInit->getSourceLocation(), 2383 diag::warn_initializer_out_of_order); 2384 2385 if (PrevInit->isAnyMemberInitializer()) 2386 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2387 else 2388 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2389 2390 if (Init->isAnyMemberInitializer()) 2391 D << 0 << Init->getAnyMember()->getDeclName(); 2392 else 2393 D << 1 << Init->getBaseClassInfo()->getType(); 2394 2395 // Move back to the initializer's location in the ideal list. 2396 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2397 if (InitKey == IdealInitKeys[IdealIndex]) 2398 break; 2399 2400 assert(IdealIndex != NumIdealInits && 2401 "initializer not found in initializer list"); 2402 } 2403 2404 PrevInit = Init; 2405 } 2406} 2407 2408namespace { 2409bool CheckRedundantInit(Sema &S, 2410 CXXCtorInitializer *Init, 2411 CXXCtorInitializer *&PrevInit) { 2412 if (!PrevInit) { 2413 PrevInit = Init; 2414 return false; 2415 } 2416 2417 if (FieldDecl *Field = Init->getMember()) 2418 S.Diag(Init->getSourceLocation(), 2419 diag::err_multiple_mem_initialization) 2420 << Field->getDeclName() 2421 << Init->getSourceRange(); 2422 else { 2423 const Type *BaseClass = Init->getBaseClass(); 2424 assert(BaseClass && "neither field nor base"); 2425 S.Diag(Init->getSourceLocation(), 2426 diag::err_multiple_base_initialization) 2427 << QualType(BaseClass, 0) 2428 << Init->getSourceRange(); 2429 } 2430 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2431 << 0 << PrevInit->getSourceRange(); 2432 2433 return true; 2434} 2435 2436typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2437typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2438 2439bool CheckRedundantUnionInit(Sema &S, 2440 CXXCtorInitializer *Init, 2441 RedundantUnionMap &Unions) { 2442 FieldDecl *Field = Init->getAnyMember(); 2443 RecordDecl *Parent = Field->getParent(); 2444 if (!Parent->isAnonymousStructOrUnion()) 2445 return false; 2446 2447 NamedDecl *Child = Field; 2448 do { 2449 if (Parent->isUnion()) { 2450 UnionEntry &En = Unions[Parent]; 2451 if (En.first && En.first != Child) { 2452 S.Diag(Init->getSourceLocation(), 2453 diag::err_multiple_mem_union_initialization) 2454 << Field->getDeclName() 2455 << Init->getSourceRange(); 2456 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2457 << 0 << En.second->getSourceRange(); 2458 return true; 2459 } else if (!En.first) { 2460 En.first = Child; 2461 En.second = Init; 2462 } 2463 } 2464 2465 Child = Parent; 2466 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2467 } while (Parent->isAnonymousStructOrUnion()); 2468 2469 return false; 2470} 2471} 2472 2473/// ActOnMemInitializers - Handle the member initializers for a constructor. 2474void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2475 SourceLocation ColonLoc, 2476 MemInitTy **meminits, unsigned NumMemInits, 2477 bool AnyErrors) { 2478 if (!ConstructorDecl) 2479 return; 2480 2481 AdjustDeclIfTemplate(ConstructorDecl); 2482 2483 CXXConstructorDecl *Constructor 2484 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2485 2486 if (!Constructor) { 2487 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2488 return; 2489 } 2490 2491 CXXCtorInitializer **MemInits = 2492 reinterpret_cast<CXXCtorInitializer **>(meminits); 2493 2494 // Mapping for the duplicate initializers check. 2495 // For member initializers, this is keyed with a FieldDecl*. 2496 // For base initializers, this is keyed with a Type*. 2497 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2498 2499 // Mapping for the inconsistent anonymous-union initializers check. 2500 RedundantUnionMap MemberUnions; 2501 2502 bool HadError = false; 2503 for (unsigned i = 0; i < NumMemInits; i++) { 2504 CXXCtorInitializer *Init = MemInits[i]; 2505 2506 // Set the source order index. 2507 Init->setSourceOrder(i); 2508 2509 if (Init->isAnyMemberInitializer()) { 2510 FieldDecl *Field = Init->getAnyMember(); 2511 if (CheckRedundantInit(*this, Init, Members[Field]) || 2512 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2513 HadError = true; 2514 } else if (Init->isBaseInitializer()) { 2515 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2516 if (CheckRedundantInit(*this, Init, Members[Key])) 2517 HadError = true; 2518 } else { 2519 assert(Init->isDelegatingInitializer()); 2520 // This must be the only initializer 2521 if (i != 0 || NumMemInits > 1) { 2522 Diag(MemInits[0]->getSourceLocation(), 2523 diag::err_delegating_initializer_alone) 2524 << MemInits[0]->getSourceRange(); 2525 HadError = true; 2526 // We will treat this as being the only initializer. 2527 } 2528 SetDelegatingInitializer(Constructor, MemInits[i]); 2529 // Return immediately as the initializer is set. 2530 return; 2531 } 2532 } 2533 2534 if (HadError) 2535 return; 2536 2537 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2538 2539 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2540} 2541 2542void 2543Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2544 CXXRecordDecl *ClassDecl) { 2545 // Ignore dependent contexts. 2546 if (ClassDecl->isDependentContext()) 2547 return; 2548 2549 // FIXME: all the access-control diagnostics are positioned on the 2550 // field/base declaration. That's probably good; that said, the 2551 // user might reasonably want to know why the destructor is being 2552 // emitted, and we currently don't say. 2553 2554 // Non-static data members. 2555 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2556 E = ClassDecl->field_end(); I != E; ++I) { 2557 FieldDecl *Field = *I; 2558 if (Field->isInvalidDecl()) 2559 continue; 2560 QualType FieldType = Context.getBaseElementType(Field->getType()); 2561 2562 const RecordType* RT = FieldType->getAs<RecordType>(); 2563 if (!RT) 2564 continue; 2565 2566 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2567 if (FieldClassDecl->isInvalidDecl()) 2568 continue; 2569 if (FieldClassDecl->hasTrivialDestructor()) 2570 continue; 2571 2572 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2573 assert(Dtor && "No dtor found for FieldClassDecl!"); 2574 CheckDestructorAccess(Field->getLocation(), Dtor, 2575 PDiag(diag::err_access_dtor_field) 2576 << Field->getDeclName() 2577 << FieldType); 2578 2579 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2580 } 2581 2582 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2583 2584 // Bases. 2585 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2586 E = ClassDecl->bases_end(); Base != E; ++Base) { 2587 // Bases are always records in a well-formed non-dependent class. 2588 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2589 2590 // Remember direct virtual bases. 2591 if (Base->isVirtual()) 2592 DirectVirtualBases.insert(RT); 2593 2594 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2595 // If our base class is invalid, we probably can't get its dtor anyway. 2596 if (BaseClassDecl->isInvalidDecl()) 2597 continue; 2598 // Ignore trivial destructors. 2599 if (BaseClassDecl->hasTrivialDestructor()) 2600 continue; 2601 2602 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2603 assert(Dtor && "No dtor found for BaseClassDecl!"); 2604 2605 // FIXME: caret should be on the start of the class name 2606 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2607 PDiag(diag::err_access_dtor_base) 2608 << Base->getType() 2609 << Base->getSourceRange()); 2610 2611 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2612 } 2613 2614 // Virtual bases. 2615 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2616 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2617 2618 // Bases are always records in a well-formed non-dependent class. 2619 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2620 2621 // Ignore direct virtual bases. 2622 if (DirectVirtualBases.count(RT)) 2623 continue; 2624 2625 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2626 // If our base class is invalid, we probably can't get its dtor anyway. 2627 if (BaseClassDecl->isInvalidDecl()) 2628 continue; 2629 // Ignore trivial destructors. 2630 if (BaseClassDecl->hasTrivialDestructor()) 2631 continue; 2632 2633 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2634 assert(Dtor && "No dtor found for BaseClassDecl!"); 2635 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2636 PDiag(diag::err_access_dtor_vbase) 2637 << VBase->getType()); 2638 2639 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2640 } 2641} 2642 2643void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2644 if (!CDtorDecl) 2645 return; 2646 2647 if (CXXConstructorDecl *Constructor 2648 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2649 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2650} 2651 2652bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2653 unsigned DiagID, AbstractDiagSelID SelID) { 2654 if (SelID == -1) 2655 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2656 else 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2658} 2659 2660bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2661 const PartialDiagnostic &PD) { 2662 if (!getLangOptions().CPlusPlus) 2663 return false; 2664 2665 if (const ArrayType *AT = Context.getAsArrayType(T)) 2666 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2667 2668 if (const PointerType *PT = T->getAs<PointerType>()) { 2669 // Find the innermost pointer type. 2670 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2671 PT = T; 2672 2673 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2674 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2675 } 2676 2677 const RecordType *RT = T->getAs<RecordType>(); 2678 if (!RT) 2679 return false; 2680 2681 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2682 2683 // We can't answer whether something is abstract until it has a 2684 // definition. If it's currently being defined, we'll walk back 2685 // over all the declarations when we have a full definition. 2686 const CXXRecordDecl *Def = RD->getDefinition(); 2687 if (!Def || Def->isBeingDefined()) 2688 return false; 2689 2690 if (!RD->isAbstract()) 2691 return false; 2692 2693 Diag(Loc, PD) << RD->getDeclName(); 2694 DiagnoseAbstractType(RD); 2695 2696 return true; 2697} 2698 2699void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2700 // Check if we've already emitted the list of pure virtual functions 2701 // for this class. 2702 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2703 return; 2704 2705 CXXFinalOverriderMap FinalOverriders; 2706 RD->getFinalOverriders(FinalOverriders); 2707 2708 // Keep a set of seen pure methods so we won't diagnose the same method 2709 // more than once. 2710 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2711 2712 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2713 MEnd = FinalOverriders.end(); 2714 M != MEnd; 2715 ++M) { 2716 for (OverridingMethods::iterator SO = M->second.begin(), 2717 SOEnd = M->second.end(); 2718 SO != SOEnd; ++SO) { 2719 // C++ [class.abstract]p4: 2720 // A class is abstract if it contains or inherits at least one 2721 // pure virtual function for which the final overrider is pure 2722 // virtual. 2723 2724 // 2725 if (SO->second.size() != 1) 2726 continue; 2727 2728 if (!SO->second.front().Method->isPure()) 2729 continue; 2730 2731 if (!SeenPureMethods.insert(SO->second.front().Method)) 2732 continue; 2733 2734 Diag(SO->second.front().Method->getLocation(), 2735 diag::note_pure_virtual_function) 2736 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2737 } 2738 } 2739 2740 if (!PureVirtualClassDiagSet) 2741 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2742 PureVirtualClassDiagSet->insert(RD); 2743} 2744 2745namespace { 2746struct AbstractUsageInfo { 2747 Sema &S; 2748 CXXRecordDecl *Record; 2749 CanQualType AbstractType; 2750 bool Invalid; 2751 2752 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2753 : S(S), Record(Record), 2754 AbstractType(S.Context.getCanonicalType( 2755 S.Context.getTypeDeclType(Record))), 2756 Invalid(false) {} 2757 2758 void DiagnoseAbstractType() { 2759 if (Invalid) return; 2760 S.DiagnoseAbstractType(Record); 2761 Invalid = true; 2762 } 2763 2764 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2765}; 2766 2767struct CheckAbstractUsage { 2768 AbstractUsageInfo &Info; 2769 const NamedDecl *Ctx; 2770 2771 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2772 : Info(Info), Ctx(Ctx) {} 2773 2774 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2775 switch (TL.getTypeLocClass()) { 2776#define ABSTRACT_TYPELOC(CLASS, PARENT) 2777#define TYPELOC(CLASS, PARENT) \ 2778 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2779#include "clang/AST/TypeLocNodes.def" 2780 } 2781 } 2782 2783 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2784 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2785 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2786 if (!TL.getArg(I)) 2787 continue; 2788 2789 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2790 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2791 } 2792 } 2793 2794 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2795 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2796 } 2797 2798 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2799 // Visit the type parameters from a permissive context. 2800 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2801 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2802 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2803 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2804 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2805 // TODO: other template argument types? 2806 } 2807 } 2808 2809 // Visit pointee types from a permissive context. 2810#define CheckPolymorphic(Type) \ 2811 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2812 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2813 } 2814 CheckPolymorphic(PointerTypeLoc) 2815 CheckPolymorphic(ReferenceTypeLoc) 2816 CheckPolymorphic(MemberPointerTypeLoc) 2817 CheckPolymorphic(BlockPointerTypeLoc) 2818 2819 /// Handle all the types we haven't given a more specific 2820 /// implementation for above. 2821 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2822 // Every other kind of type that we haven't called out already 2823 // that has an inner type is either (1) sugar or (2) contains that 2824 // inner type in some way as a subobject. 2825 if (TypeLoc Next = TL.getNextTypeLoc()) 2826 return Visit(Next, Sel); 2827 2828 // If there's no inner type and we're in a permissive context, 2829 // don't diagnose. 2830 if (Sel == Sema::AbstractNone) return; 2831 2832 // Check whether the type matches the abstract type. 2833 QualType T = TL.getType(); 2834 if (T->isArrayType()) { 2835 Sel = Sema::AbstractArrayType; 2836 T = Info.S.Context.getBaseElementType(T); 2837 } 2838 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2839 if (CT != Info.AbstractType) return; 2840 2841 // It matched; do some magic. 2842 if (Sel == Sema::AbstractArrayType) { 2843 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2844 << T << TL.getSourceRange(); 2845 } else { 2846 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2847 << Sel << T << TL.getSourceRange(); 2848 } 2849 Info.DiagnoseAbstractType(); 2850 } 2851}; 2852 2853void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2854 Sema::AbstractDiagSelID Sel) { 2855 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2856} 2857 2858} 2859 2860/// Check for invalid uses of an abstract type in a method declaration. 2861static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2862 CXXMethodDecl *MD) { 2863 // No need to do the check on definitions, which require that 2864 // the return/param types be complete. 2865 if (MD->doesThisDeclarationHaveABody()) 2866 return; 2867 2868 // For safety's sake, just ignore it if we don't have type source 2869 // information. This should never happen for non-implicit methods, 2870 // but... 2871 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2872 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2873} 2874 2875/// Check for invalid uses of an abstract type within a class definition. 2876static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2877 CXXRecordDecl *RD) { 2878 for (CXXRecordDecl::decl_iterator 2879 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2880 Decl *D = *I; 2881 if (D->isImplicit()) continue; 2882 2883 // Methods and method templates. 2884 if (isa<CXXMethodDecl>(D)) { 2885 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2886 } else if (isa<FunctionTemplateDecl>(D)) { 2887 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2888 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2889 2890 // Fields and static variables. 2891 } else if (isa<FieldDecl>(D)) { 2892 FieldDecl *FD = cast<FieldDecl>(D); 2893 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2894 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2895 } else if (isa<VarDecl>(D)) { 2896 VarDecl *VD = cast<VarDecl>(D); 2897 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2898 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2899 2900 // Nested classes and class templates. 2901 } else if (isa<CXXRecordDecl>(D)) { 2902 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2903 } else if (isa<ClassTemplateDecl>(D)) { 2904 CheckAbstractClassUsage(Info, 2905 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2906 } 2907 } 2908} 2909 2910/// \brief Perform semantic checks on a class definition that has been 2911/// completing, introducing implicitly-declared members, checking for 2912/// abstract types, etc. 2913void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2914 if (!Record) 2915 return; 2916 2917 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2918 AbstractUsageInfo Info(*this, Record); 2919 CheckAbstractClassUsage(Info, Record); 2920 } 2921 2922 // If this is not an aggregate type and has no user-declared constructor, 2923 // complain about any non-static data members of reference or const scalar 2924 // type, since they will never get initializers. 2925 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2926 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2927 bool Complained = false; 2928 for (RecordDecl::field_iterator F = Record->field_begin(), 2929 FEnd = Record->field_end(); 2930 F != FEnd; ++F) { 2931 if (F->getType()->isReferenceType() || 2932 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2933 if (!Complained) { 2934 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2935 << Record->getTagKind() << Record; 2936 Complained = true; 2937 } 2938 2939 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2940 << F->getType()->isReferenceType() 2941 << F->getDeclName(); 2942 } 2943 } 2944 } 2945 2946 if (Record->isDynamicClass() && !Record->isDependentType()) 2947 DynamicClasses.push_back(Record); 2948 2949 if (Record->getIdentifier()) { 2950 // C++ [class.mem]p13: 2951 // If T is the name of a class, then each of the following shall have a 2952 // name different from T: 2953 // - every member of every anonymous union that is a member of class T. 2954 // 2955 // C++ [class.mem]p14: 2956 // In addition, if class T has a user-declared constructor (12.1), every 2957 // non-static data member of class T shall have a name different from T. 2958 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2959 R.first != R.second; ++R.first) { 2960 NamedDecl *D = *R.first; 2961 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2962 isa<IndirectFieldDecl>(D)) { 2963 Diag(D->getLocation(), diag::err_member_name_of_class) 2964 << D->getDeclName(); 2965 break; 2966 } 2967 } 2968 } 2969 2970 // Warn if the class has virtual methods but non-virtual public destructor. 2971 if (Record->isPolymorphic() && !Record->isDependentType()) { 2972 CXXDestructorDecl *dtor = Record->getDestructor(); 2973 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2974 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2975 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2976 } 2977 2978 // See if a method overloads virtual methods in a base 2979 /// class without overriding any. 2980 if (!Record->isDependentType()) { 2981 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2982 MEnd = Record->method_end(); 2983 M != MEnd; ++M) { 2984 if (!(*M)->isStatic()) 2985 DiagnoseHiddenVirtualMethods(Record, *M); 2986 } 2987 } 2988 2989 // Declare inherited constructors. We do this eagerly here because: 2990 // - The standard requires an eager diagnostic for conflicting inherited 2991 // constructors from different classes. 2992 // - The lazy declaration of the other implicit constructors is so as to not 2993 // waste space and performance on classes that are not meant to be 2994 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2995 // have inherited constructors. 2996 DeclareInheritedConstructors(Record); 2997 2998 CheckExplicitlyDefaultedMethods(Record); 2999} 3000 3001void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3002 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3003 ME = Record->method_end(); 3004 MI != ME; ++MI) { 3005 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3006 switch (getSpecialMember(*MI)) { 3007 case CXXDefaultConstructor: 3008 CheckExplicitlyDefaultedDefaultConstructor( 3009 cast<CXXConstructorDecl>(*MI)); 3010 break; 3011 3012 case CXXDestructor: 3013 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3014 break; 3015 3016 case CXXCopyConstructor: 3017 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3018 break; 3019 3020 case CXXCopyAssignment: 3021 CheckExplicitlyDefaultedCopyAssignment(*MI); 3022 break; 3023 3024 default: 3025 // FIXME: Do moves once they exist 3026 llvm_unreachable("non-special member explicitly defaulted!"); 3027 } 3028 } 3029 } 3030 3031} 3032 3033void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3034 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3035 3036 // Whether this was the first-declared instance of the constructor. 3037 // This affects whether we implicitly add an exception spec (and, eventually, 3038 // constexpr). It is also ill-formed to explicitly default a constructor such 3039 // that it would be deleted. (C++0x [decl.fct.def.default]) 3040 bool First = CD == CD->getCanonicalDecl(); 3041 3042 bool HadError = false; 3043 if (CD->getNumParams() != 0) { 3044 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3045 << CD->getSourceRange(); 3046 HadError = true; 3047 } 3048 3049 ImplicitExceptionSpecification Spec 3050 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3051 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3052 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3053 *ExceptionType = Context.getFunctionType( 3054 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3055 3056 if (CtorType->hasExceptionSpec()) { 3057 if (CheckEquivalentExceptionSpec( 3058 PDiag(diag::err_incorrect_defaulted_exception_spec) 3059 << 0 /* default constructor */, 3060 PDiag(), 3061 ExceptionType, SourceLocation(), 3062 CtorType, CD->getLocation())) { 3063 HadError = true; 3064 } 3065 } else if (First) { 3066 // We set the declaration to have the computed exception spec here. 3067 // We know there are no parameters. 3068 EPI.ExtInfo = CtorType->getExtInfo(); 3069 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3070 } 3071 3072 if (HadError) { 3073 CD->setInvalidDecl(); 3074 return; 3075 } 3076 3077 if (ShouldDeleteDefaultConstructor(CD)) { 3078 if (First) { 3079 CD->setDeletedAsWritten(); 3080 } else { 3081 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3082 << 0 /* default constructor */; 3083 CD->setInvalidDecl(); 3084 } 3085 } 3086} 3087 3088void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3089 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3090 3091 // Whether this was the first-declared instance of the constructor. 3092 bool First = CD == CD->getCanonicalDecl(); 3093 3094 bool HadError = false; 3095 if (CD->getNumParams() != 1) { 3096 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3097 << CD->getSourceRange(); 3098 HadError = true; 3099 } 3100 3101 ImplicitExceptionSpecification Spec(Context); 3102 bool Const; 3103 llvm::tie(Spec, Const) = 3104 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3105 3106 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3107 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3108 *ExceptionType = Context.getFunctionType( 3109 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3110 3111 // Check for parameter type matching. 3112 // This is a copy ctor so we know it's a cv-qualified reference to T. 3113 QualType ArgType = CtorType->getArgType(0); 3114 if (ArgType->getPointeeType().isVolatileQualified()) { 3115 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3116 HadError = true; 3117 } 3118 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3119 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3120 HadError = true; 3121 } 3122 3123 if (CtorType->hasExceptionSpec()) { 3124 if (CheckEquivalentExceptionSpec( 3125 PDiag(diag::err_incorrect_defaulted_exception_spec) 3126 << 1 /* copy constructor */, 3127 PDiag(), 3128 ExceptionType, SourceLocation(), 3129 CtorType, CD->getLocation())) { 3130 HadError = true; 3131 } 3132 } else if (First) { 3133 // We set the declaration to have the computed exception spec here. 3134 // We duplicate the one parameter type. 3135 EPI.ExtInfo = CtorType->getExtInfo(); 3136 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3137 } 3138 3139 if (HadError) { 3140 CD->setInvalidDecl(); 3141 return; 3142 } 3143 3144 if (ShouldDeleteCopyConstructor(CD)) { 3145 if (First) { 3146 CD->setDeletedAsWritten(); 3147 } else { 3148 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3149 << 1 /* copy constructor */; 3150 CD->setInvalidDecl(); 3151 } 3152 } 3153} 3154 3155void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3156 assert(MD->isExplicitlyDefaulted()); 3157 3158 // Whether this was the first-declared instance of the operator 3159 bool First = MD == MD->getCanonicalDecl(); 3160 3161 bool HadError = false; 3162 if (MD->getNumParams() != 1) { 3163 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3164 << MD->getSourceRange(); 3165 HadError = true; 3166 } 3167 3168 QualType ReturnType = 3169 MD->getType()->getAs<FunctionType>()->getResultType(); 3170 if (!ReturnType->isLValueReferenceType() || 3171 !Context.hasSameType( 3172 Context.getCanonicalType(ReturnType->getPointeeType()), 3173 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3174 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3175 HadError = true; 3176 } 3177 3178 ImplicitExceptionSpecification Spec(Context); 3179 bool Const; 3180 llvm::tie(Spec, Const) = 3181 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3182 3183 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3184 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3185 *ExceptionType = Context.getFunctionType( 3186 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3187 3188 // Check for parameter type matching. 3189 // This is a copy ctor so we know it's a cv-qualified reference to T. 3190 QualType ArgType = OperType->getArgType(0); 3191 if (ArgType->getPointeeType().isVolatileQualified()) { 3192 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3193 HadError = true; 3194 } 3195 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3196 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3197 HadError = true; 3198 } 3199 if (OperType->getTypeQuals()) { 3200 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3201 HadError = true; 3202 } 3203 3204 if (OperType->hasExceptionSpec()) { 3205 if (CheckEquivalentExceptionSpec( 3206 PDiag(diag::err_incorrect_defaulted_exception_spec) 3207 << 2 /* copy assignment operator */, 3208 PDiag(), 3209 ExceptionType, SourceLocation(), 3210 OperType, MD->getLocation())) { 3211 HadError = true; 3212 } 3213 } else if (First) { 3214 // We set the declaration to have the computed exception spec here. 3215 // We duplicate the one parameter type. 3216 EPI.RefQualifier = OperType->getRefQualifier(); 3217 EPI.ExtInfo = OperType->getExtInfo(); 3218 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3219 } 3220 3221 if (HadError) { 3222 MD->setInvalidDecl(); 3223 return; 3224 } 3225 3226 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3227 if (First) { 3228 MD->setDeletedAsWritten(); 3229 } else { 3230 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3231 << 2 /* copy assignment operator */; 3232 MD->setInvalidDecl(); 3233 } 3234 } 3235} 3236 3237void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3238 assert(DD->isExplicitlyDefaulted()); 3239 3240 // Whether this was the first-declared instance of the destructor. 3241 bool First = DD == DD->getCanonicalDecl(); 3242 3243 ImplicitExceptionSpecification Spec 3244 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3245 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3246 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3247 *ExceptionType = Context.getFunctionType( 3248 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3249 3250 if (DtorType->hasExceptionSpec()) { 3251 if (CheckEquivalentExceptionSpec( 3252 PDiag(diag::err_incorrect_defaulted_exception_spec) 3253 << 3 /* destructor */, 3254 PDiag(), 3255 ExceptionType, SourceLocation(), 3256 DtorType, DD->getLocation())) { 3257 DD->setInvalidDecl(); 3258 return; 3259 } 3260 } else if (First) { 3261 // We set the declaration to have the computed exception spec here. 3262 // There are no parameters. 3263 EPI.ExtInfo = DtorType->getExtInfo(); 3264 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3265 } 3266 3267 if (ShouldDeleteDestructor(DD)) { 3268 if (First) { 3269 DD->setDeletedAsWritten(); 3270 } else { 3271 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3272 << 3 /* destructor */; 3273 DD->setInvalidDecl(); 3274 } 3275 } 3276} 3277 3278bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3279 CXXRecordDecl *RD = CD->getParent(); 3280 assert(!RD->isDependentType() && "do deletion after instantiation"); 3281 if (!LangOpts.CPlusPlus0x) 3282 return false; 3283 3284 // Do access control from the constructor 3285 ContextRAII CtorContext(*this, CD); 3286 3287 bool Union = RD->isUnion(); 3288 bool AllConst = true; 3289 3290 // We do this because we should never actually use an anonymous 3291 // union's constructor. 3292 if (Union && RD->isAnonymousStructOrUnion()) 3293 return false; 3294 3295 // FIXME: We should put some diagnostic logic right into this function. 3296 3297 // C++0x [class.ctor]/5 3298 // A defaulted default constructor for class X is defined as delete if: 3299 3300 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3301 BE = RD->bases_end(); 3302 BI != BE; ++BI) { 3303 // We'll handle this one later 3304 if (BI->isVirtual()) 3305 continue; 3306 3307 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3308 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3309 3310 // -- any [direct base class] has a type with a destructor that is 3311 // delete or inaccessible from the defaulted default constructor 3312 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3313 if (BaseDtor->isDeleted()) 3314 return true; 3315 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3316 AR_accessible) 3317 return true; 3318 3319 // -- any [direct base class either] has no default constructor or 3320 // overload resolution as applied to [its] default constructor 3321 // results in an ambiguity or in a function that is deleted or 3322 // inaccessible from the defaulted default constructor 3323 InitializedEntity BaseEntity = 3324 InitializedEntity::InitializeBase(Context, BI, 0); 3325 InitializationKind Kind = 3326 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3327 SourceLocation()); 3328 3329 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3330 3331 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3332 return true; 3333 } 3334 3335 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3336 BE = RD->vbases_end(); 3337 BI != BE; ++BI) { 3338 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3339 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3340 3341 // -- any [virtual base class] has a type with a destructor that is 3342 // delete or inaccessible from the defaulted default constructor 3343 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3344 if (BaseDtor->isDeleted()) 3345 return true; 3346 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3347 AR_accessible) 3348 return true; 3349 3350 // -- any [virtual base class either] has no default constructor or 3351 // overload resolution as applied to [its] default constructor 3352 // results in an ambiguity or in a function that is deleted or 3353 // inaccessible from the defaulted default constructor 3354 InitializedEntity BaseEntity = 3355 InitializedEntity::InitializeBase(Context, BI, BI); 3356 InitializationKind Kind = 3357 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3358 SourceLocation()); 3359 3360 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3361 3362 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3363 return true; 3364 } 3365 3366 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3367 FE = RD->field_end(); 3368 FI != FE; ++FI) { 3369 QualType FieldType = Context.getBaseElementType(FI->getType()); 3370 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3371 3372 // -- any non-static data member with no brace-or-equal-initializer is of 3373 // reference type 3374 if (FieldType->isReferenceType()) 3375 return true; 3376 3377 // -- X is a union and all its variant members are of const-qualified type 3378 // (or array thereof) 3379 if (Union && !FieldType.isConstQualified()) 3380 AllConst = false; 3381 3382 if (FieldRecord) { 3383 // -- X is a union-like class that has a variant member with a non-trivial 3384 // default constructor 3385 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3386 return true; 3387 3388 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3389 if (FieldDtor->isDeleted()) 3390 return true; 3391 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3392 AR_accessible) 3393 return true; 3394 3395 // -- any non-variant non-static data member of const-qualified type (or 3396 // array thereof) with no brace-or-equal-initializer does not have a 3397 // user-provided default constructor 3398 if (FieldType.isConstQualified() && 3399 !FieldRecord->hasUserProvidedDefaultConstructor()) 3400 return true; 3401 3402 if (!Union && FieldRecord->isUnion() && 3403 FieldRecord->isAnonymousStructOrUnion()) { 3404 // We're okay to reuse AllConst here since we only care about the 3405 // value otherwise if we're in a union. 3406 AllConst = true; 3407 3408 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3409 UE = FieldRecord->field_end(); 3410 UI != UE; ++UI) { 3411 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3412 CXXRecordDecl *UnionFieldRecord = 3413 UnionFieldType->getAsCXXRecordDecl(); 3414 3415 if (!UnionFieldType.isConstQualified()) 3416 AllConst = false; 3417 3418 if (UnionFieldRecord && 3419 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3420 return true; 3421 } 3422 3423 if (AllConst) 3424 return true; 3425 3426 // Don't try to initialize the anonymous union 3427 // This is technically non-conformant, but sanity demands it. 3428 continue; 3429 } 3430 } 3431 3432 InitializedEntity MemberEntity = 3433 InitializedEntity::InitializeMember(*FI, 0); 3434 InitializationKind Kind = 3435 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3436 SourceLocation()); 3437 3438 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3439 3440 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3441 return true; 3442 } 3443 3444 if (Union && AllConst) 3445 return true; 3446 3447 return false; 3448} 3449 3450bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3451 CXXRecordDecl *RD = CD->getParent(); 3452 assert(!RD->isDependentType() && "do deletion after instantiation"); 3453 if (!LangOpts.CPlusPlus0x) 3454 return false; 3455 3456 // Do access control from the constructor 3457 ContextRAII CtorContext(*this, CD); 3458 3459 bool Union = RD->isUnion(); 3460 3461 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3462 "copy assignment arg has no pointee type"); 3463 bool ConstArg = 3464 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3465 3466 // We do this because we should never actually use an anonymous 3467 // union's constructor. 3468 if (Union && RD->isAnonymousStructOrUnion()) 3469 return false; 3470 3471 // FIXME: We should put some diagnostic logic right into this function. 3472 3473 // C++0x [class.copy]/11 3474 // A defaulted [copy] constructor for class X is defined as delete if X has: 3475 3476 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3477 BE = RD->bases_end(); 3478 BI != BE; ++BI) { 3479 // We'll handle this one later 3480 if (BI->isVirtual()) 3481 continue; 3482 3483 QualType BaseType = BI->getType(); 3484 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3485 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3486 3487 // -- any [direct base class] of a type with a destructor that is deleted or 3488 // inaccessible from the defaulted constructor 3489 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3490 if (BaseDtor->isDeleted()) 3491 return true; 3492 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3493 AR_accessible) 3494 return true; 3495 3496 // -- a [direct base class] B that cannot be [copied] because overload 3497 // resolution, as applied to B's [copy] constructor, results in an 3498 // ambiguity or a function that is deleted or inaccessible from the 3499 // defaulted constructor 3500 InitializedEntity BaseEntity = 3501 InitializedEntity::InitializeBase(Context, BI, 0); 3502 InitializationKind Kind = 3503 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3504 SourceLocation()); 3505 3506 // Construct a fake expression to perform the copy overloading. 3507 QualType ArgType = BaseType.getUnqualifiedType(); 3508 if (ConstArg) 3509 ArgType.addConst(); 3510 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3511 VK_LValue); 3512 3513 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3514 3515 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3516 return true; 3517 } 3518 3519 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3520 BE = RD->vbases_end(); 3521 BI != BE; ++BI) { 3522 QualType BaseType = BI->getType(); 3523 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3524 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3525 3526 // -- any [direct base class] of a type with a destructor that is deleted or 3527 // inaccessible from the defaulted constructor 3528 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3529 if (BaseDtor->isDeleted()) 3530 return true; 3531 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3532 AR_accessible) 3533 return true; 3534 3535 // -- a [virtual base class] B that cannot be [copied] because overload 3536 // resolution, as applied to B's [copy] constructor, results in an 3537 // ambiguity or a function that is deleted or inaccessible from the 3538 // defaulted constructor 3539 InitializedEntity BaseEntity = 3540 InitializedEntity::InitializeBase(Context, BI, BI); 3541 InitializationKind Kind = 3542 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3543 SourceLocation()); 3544 3545 // Construct a fake expression to perform the copy overloading. 3546 QualType ArgType = BaseType.getUnqualifiedType(); 3547 if (ConstArg) 3548 ArgType.addConst(); 3549 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3550 VK_LValue); 3551 3552 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3553 3554 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3555 return true; 3556 } 3557 3558 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3559 FE = RD->field_end(); 3560 FI != FE; ++FI) { 3561 QualType FieldType = Context.getBaseElementType(FI->getType()); 3562 3563 // -- for a copy constructor, a non-static data member of rvalue reference 3564 // type 3565 if (FieldType->isRValueReferenceType()) 3566 return true; 3567 3568 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3569 3570 if (FieldRecord) { 3571 // This is an anonymous union 3572 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3573 // Anonymous unions inside unions do not variant members create 3574 if (!Union) { 3575 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3576 UE = FieldRecord->field_end(); 3577 UI != UE; ++UI) { 3578 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3579 CXXRecordDecl *UnionFieldRecord = 3580 UnionFieldType->getAsCXXRecordDecl(); 3581 3582 // -- a variant member with a non-trivial [copy] constructor and X 3583 // is a union-like class 3584 if (UnionFieldRecord && 3585 !UnionFieldRecord->hasTrivialCopyConstructor()) 3586 return true; 3587 } 3588 } 3589 3590 // Don't try to initalize an anonymous union 3591 continue; 3592 } else { 3593 // -- a variant member with a non-trivial [copy] constructor and X is a 3594 // union-like class 3595 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3596 return true; 3597 3598 // -- any [non-static data member] of a type with a destructor that is 3599 // deleted or inaccessible from the defaulted constructor 3600 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3601 if (FieldDtor->isDeleted()) 3602 return true; 3603 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3604 AR_accessible) 3605 return true; 3606 } 3607 } 3608 3609 llvm::SmallVector<InitializedEntity, 4> Entities; 3610 QualType CurType = FI->getType(); 3611 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3612 while (CurType->isArrayType()) { 3613 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3614 Entities.back())); 3615 CurType = Context.getAsArrayType(CurType)->getElementType(); 3616 } 3617 3618 InitializationKind Kind = 3619 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3620 SourceLocation()); 3621 3622 // Construct a fake expression to perform the copy overloading. 3623 QualType ArgType = FieldType; 3624 if (ArgType->isReferenceType()) 3625 ArgType = ArgType->getPointeeType(); 3626 else if (ConstArg) 3627 ArgType.addConst(); 3628 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3629 VK_LValue); 3630 3631 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3632 3633 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3634 return true; 3635 } 3636 3637 return false; 3638} 3639 3640bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3641 CXXRecordDecl *RD = MD->getParent(); 3642 assert(!RD->isDependentType() && "do deletion after instantiation"); 3643 if (!LangOpts.CPlusPlus0x) 3644 return false; 3645 3646 // Do access control from the constructor 3647 ContextRAII MethodContext(*this, MD); 3648 3649 bool Union = RD->isUnion(); 3650 3651 bool ConstArg = 3652 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3653 3654 // We do this because we should never actually use an anonymous 3655 // union's constructor. 3656 if (Union && RD->isAnonymousStructOrUnion()) 3657 return false; 3658 3659 DeclarationName OperatorName = 3660 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3661 LookupResult R(*this, OperatorName, SourceLocation(), LookupOrdinaryName); 3662 R.suppressDiagnostics(); 3663 3664 // FIXME: We should put some diagnostic logic right into this function. 3665 3666 // C++0x [class.copy]/11 3667 // A defaulted [copy] assignment operator for class X is defined as deleted 3668 // if X has: 3669 3670 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3671 BE = RD->bases_end(); 3672 BI != BE; ++BI) { 3673 // We'll handle this one later 3674 if (BI->isVirtual()) 3675 continue; 3676 3677 QualType BaseType = BI->getType(); 3678 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3679 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3680 3681 // -- a [direct base class] B that cannot be [copied] because overload 3682 // resolution, as applied to B's [copy] assignment operator, results in 3683 // an ambiguity or a function that is deleted or inaccessible from the 3684 // assignment operator 3685 3686 LookupQualifiedName(R, BaseDecl, false); 3687 3688 // Filter out any result that isn't a copy-assignment operator. 3689 LookupResult::Filter F = R.makeFilter(); 3690 while (F.hasNext()) { 3691 NamedDecl *D = F.next(); 3692 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3693 if (Method->isCopyAssignmentOperator()) 3694 continue; 3695 3696 F.erase(); 3697 } 3698 F.done(); 3699 3700 // Build a fake argument expression 3701 QualType ArgType = BaseType; 3702 QualType ThisType = BaseType; 3703 if (ConstArg) 3704 ArgType.addConst(); 3705 Expr *Args[] = { new (Context) OpaqueValueExpr(SourceLocation(), ThisType, 3706 VK_LValue) 3707 , new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3708 VK_LValue) 3709 }; 3710 3711 OverloadCandidateSet OCS((SourceLocation())); 3712 OverloadCandidateSet::iterator Best; 3713 3714 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3715 3716 if (OCS.BestViableFunction(*this, SourceLocation(), Best, false) != 3717 OR_Success) 3718 return true; 3719 } 3720 3721 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3722 BE = RD->vbases_end(); 3723 BI != BE; ++BI) { 3724 QualType BaseType = BI->getType(); 3725 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3726 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3727 3728 // -- a [virtual base class] B that cannot be [copied] because overload 3729 // resolution, as applied to B's [copy] assignment operator, results in 3730 // an ambiguity or a function that is deleted or inaccessible from the 3731 // assignment operator 3732 3733 LookupQualifiedName(R, BaseDecl, false); 3734 3735 // Filter out any result that isn't a copy-assignment operator. 3736 LookupResult::Filter F = R.makeFilter(); 3737 while (F.hasNext()) { 3738 NamedDecl *D = F.next(); 3739 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3740 if (Method->isCopyAssignmentOperator()) 3741 continue; 3742 3743 F.erase(); 3744 } 3745 F.done(); 3746 3747 // Build a fake argument expression 3748 QualType ArgType = BaseType; 3749 QualType ThisType = BaseType; 3750 if (ConstArg) 3751 ArgType.addConst(); 3752 Expr *Args[] = { new (Context) OpaqueValueExpr(SourceLocation(), ThisType, 3753 VK_LValue) 3754 , new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3755 VK_LValue) 3756 }; 3757 3758 OverloadCandidateSet OCS((SourceLocation())); 3759 OverloadCandidateSet::iterator Best; 3760 3761 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3762 3763 if (OCS.BestViableFunction(*this, SourceLocation(), Best, false) != 3764 OR_Success) 3765 return true; 3766 } 3767 3768 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3769 FE = RD->field_end(); 3770 FI != FE; ++FI) { 3771 QualType FieldType = Context.getBaseElementType(FI->getType()); 3772 3773 // -- a non-static data member of reference type 3774 if (FieldType->isReferenceType()) 3775 return true; 3776 3777 // -- a non-static data member of const non-class type (or array thereof) 3778 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3779 return true; 3780 3781 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3782 3783 if (FieldRecord) { 3784 // This is an anonymous union 3785 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3786 // Anonymous unions inside unions do not variant members create 3787 if (!Union) { 3788 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3789 UE = FieldRecord->field_end(); 3790 UI != UE; ++UI) { 3791 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3792 CXXRecordDecl *UnionFieldRecord = 3793 UnionFieldType->getAsCXXRecordDecl(); 3794 3795 // -- a variant member with a non-trivial [copy] assignment operator 3796 // and X is a union-like class 3797 if (UnionFieldRecord && 3798 !UnionFieldRecord->hasTrivialCopyAssignment()) 3799 return true; 3800 } 3801 } 3802 3803 // Don't try to initalize an anonymous union 3804 continue; 3805 // -- a variant member with a non-trivial [copy] assignment operator 3806 // and X is a union-like class 3807 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3808 return true; 3809 } 3810 3811 LookupQualifiedName(R, FieldRecord, false); 3812 3813 // Filter out any result that isn't a copy-assignment operator. 3814 LookupResult::Filter F = R.makeFilter(); 3815 while (F.hasNext()) { 3816 NamedDecl *D = F.next(); 3817 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3818 if (Method->isCopyAssignmentOperator()) 3819 continue; 3820 3821 F.erase(); 3822 } 3823 F.done(); 3824 3825 // Build a fake argument expression 3826 QualType ArgType = FieldType; 3827 QualType ThisType = FieldType; 3828 if (ConstArg) 3829 ArgType.addConst(); 3830 Expr *Args[] = { new (Context) OpaqueValueExpr(SourceLocation(), ThisType, 3831 VK_LValue) 3832 , new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3833 VK_LValue) 3834 }; 3835 3836 OverloadCandidateSet OCS((SourceLocation())); 3837 OverloadCandidateSet::iterator Best; 3838 3839 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3840 3841 if (OCS.BestViableFunction(*this, SourceLocation(), Best, false) != 3842 OR_Success) 3843 return true; 3844 } 3845 } 3846 3847 return false; 3848} 3849 3850bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3851 CXXRecordDecl *RD = DD->getParent(); 3852 assert(!RD->isDependentType() && "do deletion after instantiation"); 3853 if (!LangOpts.CPlusPlus0x) 3854 return false; 3855 3856 // Do access control from the destructor 3857 ContextRAII CtorContext(*this, DD); 3858 3859 bool Union = RD->isUnion(); 3860 3861 // We do this because we should never actually use an anonymous 3862 // union's destructor. 3863 if (Union && RD->isAnonymousStructOrUnion()) 3864 return false; 3865 3866 // C++0x [class.dtor]p5 3867 // A defaulted destructor for a class X is defined as deleted if: 3868 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3869 BE = RD->bases_end(); 3870 BI != BE; ++BI) { 3871 // We'll handle this one later 3872 if (BI->isVirtual()) 3873 continue; 3874 3875 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3876 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3877 assert(BaseDtor && "base has no destructor"); 3878 3879 // -- any direct or virtual base class has a deleted destructor or 3880 // a destructor that is inaccessible from the defaulted destructor 3881 if (BaseDtor->isDeleted()) 3882 return true; 3883 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3884 AR_accessible) 3885 return true; 3886 } 3887 3888 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3889 BE = RD->vbases_end(); 3890 BI != BE; ++BI) { 3891 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3892 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3893 assert(BaseDtor && "base has no destructor"); 3894 3895 // -- any direct or virtual base class has a deleted destructor or 3896 // a destructor that is inaccessible from the defaulted destructor 3897 if (BaseDtor->isDeleted()) 3898 return true; 3899 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3900 AR_accessible) 3901 return true; 3902 } 3903 3904 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3905 FE = RD->field_end(); 3906 FI != FE; ++FI) { 3907 QualType FieldType = Context.getBaseElementType(FI->getType()); 3908 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3909 if (FieldRecord) { 3910 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3911 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3912 UE = FieldRecord->field_end(); 3913 UI != UE; ++UI) { 3914 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3915 CXXRecordDecl *UnionFieldRecord = 3916 UnionFieldType->getAsCXXRecordDecl(); 3917 3918 // -- X is a union-like class that has a variant member with a non- 3919 // trivial destructor. 3920 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3921 return true; 3922 } 3923 // Technically we are supposed to do this next check unconditionally. 3924 // But that makes absolutely no sense. 3925 } else { 3926 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3927 3928 // -- any of the non-static data members has class type M (or array 3929 // thereof) and M has a deleted destructor or a destructor that is 3930 // inaccessible from the defaulted destructor 3931 if (FieldDtor->isDeleted()) 3932 return true; 3933 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3934 AR_accessible) 3935 return true; 3936 3937 // -- X is a union-like class that has a variant member with a non- 3938 // trivial destructor. 3939 if (Union && !FieldDtor->isTrivial()) 3940 return true; 3941 } 3942 } 3943 } 3944 3945 if (DD->isVirtual()) { 3946 FunctionDecl *OperatorDelete = 0; 3947 DeclarationName Name = 3948 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3949 if (FindDeallocationFunction(SourceLocation(), RD, Name, OperatorDelete, 3950 false)) 3951 return true; 3952 } 3953 3954 3955 return false; 3956} 3957 3958/// \brief Data used with FindHiddenVirtualMethod 3959namespace { 3960 struct FindHiddenVirtualMethodData { 3961 Sema *S; 3962 CXXMethodDecl *Method; 3963 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3964 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3965 }; 3966} 3967 3968/// \brief Member lookup function that determines whether a given C++ 3969/// method overloads virtual methods in a base class without overriding any, 3970/// to be used with CXXRecordDecl::lookupInBases(). 3971static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3972 CXXBasePath &Path, 3973 void *UserData) { 3974 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3975 3976 FindHiddenVirtualMethodData &Data 3977 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3978 3979 DeclarationName Name = Data.Method->getDeclName(); 3980 assert(Name.getNameKind() == DeclarationName::Identifier); 3981 3982 bool foundSameNameMethod = false; 3983 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3984 for (Path.Decls = BaseRecord->lookup(Name); 3985 Path.Decls.first != Path.Decls.second; 3986 ++Path.Decls.first) { 3987 NamedDecl *D = *Path.Decls.first; 3988 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3989 MD = MD->getCanonicalDecl(); 3990 foundSameNameMethod = true; 3991 // Interested only in hidden virtual methods. 3992 if (!MD->isVirtual()) 3993 continue; 3994 // If the method we are checking overrides a method from its base 3995 // don't warn about the other overloaded methods. 3996 if (!Data.S->IsOverload(Data.Method, MD, false)) 3997 return true; 3998 // Collect the overload only if its hidden. 3999 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4000 overloadedMethods.push_back(MD); 4001 } 4002 } 4003 4004 if (foundSameNameMethod) 4005 Data.OverloadedMethods.append(overloadedMethods.begin(), 4006 overloadedMethods.end()); 4007 return foundSameNameMethod; 4008} 4009 4010/// \brief See if a method overloads virtual methods in a base class without 4011/// overriding any. 4012void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4013 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4014 MD->getLocation()) == Diagnostic::Ignored) 4015 return; 4016 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4017 return; 4018 4019 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4020 /*bool RecordPaths=*/false, 4021 /*bool DetectVirtual=*/false); 4022 FindHiddenVirtualMethodData Data; 4023 Data.Method = MD; 4024 Data.S = this; 4025 4026 // Keep the base methods that were overriden or introduced in the subclass 4027 // by 'using' in a set. A base method not in this set is hidden. 4028 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4029 res.first != res.second; ++res.first) { 4030 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4031 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4032 E = MD->end_overridden_methods(); 4033 I != E; ++I) 4034 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4035 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4036 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4037 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4038 } 4039 4040 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4041 !Data.OverloadedMethods.empty()) { 4042 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4043 << MD << (Data.OverloadedMethods.size() > 1); 4044 4045 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4046 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4047 Diag(overloadedMD->getLocation(), 4048 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4049 } 4050 } 4051} 4052 4053void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4054 Decl *TagDecl, 4055 SourceLocation LBrac, 4056 SourceLocation RBrac, 4057 AttributeList *AttrList) { 4058 if (!TagDecl) 4059 return; 4060 4061 AdjustDeclIfTemplate(TagDecl); 4062 4063 ActOnFields(S, RLoc, TagDecl, 4064 // strict aliasing violation! 4065 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4066 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4067 4068 CheckCompletedCXXClass( 4069 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4070} 4071 4072/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4073/// special functions, such as the default constructor, copy 4074/// constructor, or destructor, to the given C++ class (C++ 4075/// [special]p1). This routine can only be executed just before the 4076/// definition of the class is complete. 4077void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4078 if (!ClassDecl->hasUserDeclaredConstructor()) 4079 ++ASTContext::NumImplicitDefaultConstructors; 4080 4081 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4082 ++ASTContext::NumImplicitCopyConstructors; 4083 4084 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4085 ++ASTContext::NumImplicitCopyAssignmentOperators; 4086 4087 // If we have a dynamic class, then the copy assignment operator may be 4088 // virtual, so we have to declare it immediately. This ensures that, e.g., 4089 // it shows up in the right place in the vtable and that we diagnose 4090 // problems with the implicit exception specification. 4091 if (ClassDecl->isDynamicClass()) 4092 DeclareImplicitCopyAssignment(ClassDecl); 4093 } 4094 4095 if (!ClassDecl->hasUserDeclaredDestructor()) { 4096 ++ASTContext::NumImplicitDestructors; 4097 4098 // If we have a dynamic class, then the destructor may be virtual, so we 4099 // have to declare the destructor immediately. This ensures that, e.g., it 4100 // shows up in the right place in the vtable and that we diagnose problems 4101 // with the implicit exception specification. 4102 if (ClassDecl->isDynamicClass()) 4103 DeclareImplicitDestructor(ClassDecl); 4104 } 4105} 4106 4107void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4108 if (!D) 4109 return; 4110 4111 int NumParamList = D->getNumTemplateParameterLists(); 4112 for (int i = 0; i < NumParamList; i++) { 4113 TemplateParameterList* Params = D->getTemplateParameterList(i); 4114 for (TemplateParameterList::iterator Param = Params->begin(), 4115 ParamEnd = Params->end(); 4116 Param != ParamEnd; ++Param) { 4117 NamedDecl *Named = cast<NamedDecl>(*Param); 4118 if (Named->getDeclName()) { 4119 S->AddDecl(Named); 4120 IdResolver.AddDecl(Named); 4121 } 4122 } 4123 } 4124} 4125 4126void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4127 if (!D) 4128 return; 4129 4130 TemplateParameterList *Params = 0; 4131 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4132 Params = Template->getTemplateParameters(); 4133 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4134 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4135 Params = PartialSpec->getTemplateParameters(); 4136 else 4137 return; 4138 4139 for (TemplateParameterList::iterator Param = Params->begin(), 4140 ParamEnd = Params->end(); 4141 Param != ParamEnd; ++Param) { 4142 NamedDecl *Named = cast<NamedDecl>(*Param); 4143 if (Named->getDeclName()) { 4144 S->AddDecl(Named); 4145 IdResolver.AddDecl(Named); 4146 } 4147 } 4148} 4149 4150void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4151 if (!RecordD) return; 4152 AdjustDeclIfTemplate(RecordD); 4153 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4154 PushDeclContext(S, Record); 4155} 4156 4157void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4158 if (!RecordD) return; 4159 PopDeclContext(); 4160} 4161 4162/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4163/// parsing a top-level (non-nested) C++ class, and we are now 4164/// parsing those parts of the given Method declaration that could 4165/// not be parsed earlier (C++ [class.mem]p2), such as default 4166/// arguments. This action should enter the scope of the given 4167/// Method declaration as if we had just parsed the qualified method 4168/// name. However, it should not bring the parameters into scope; 4169/// that will be performed by ActOnDelayedCXXMethodParameter. 4170void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4171} 4172 4173/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4174/// C++ method declaration. We're (re-)introducing the given 4175/// function parameter into scope for use in parsing later parts of 4176/// the method declaration. For example, we could see an 4177/// ActOnParamDefaultArgument event for this parameter. 4178void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4179 if (!ParamD) 4180 return; 4181 4182 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4183 4184 // If this parameter has an unparsed default argument, clear it out 4185 // to make way for the parsed default argument. 4186 if (Param->hasUnparsedDefaultArg()) 4187 Param->setDefaultArg(0); 4188 4189 S->AddDecl(Param); 4190 if (Param->getDeclName()) 4191 IdResolver.AddDecl(Param); 4192} 4193 4194/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4195/// processing the delayed method declaration for Method. The method 4196/// declaration is now considered finished. There may be a separate 4197/// ActOnStartOfFunctionDef action later (not necessarily 4198/// immediately!) for this method, if it was also defined inside the 4199/// class body. 4200void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4201 if (!MethodD) 4202 return; 4203 4204 AdjustDeclIfTemplate(MethodD); 4205 4206 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4207 4208 // Now that we have our default arguments, check the constructor 4209 // again. It could produce additional diagnostics or affect whether 4210 // the class has implicitly-declared destructors, among other 4211 // things. 4212 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4213 CheckConstructor(Constructor); 4214 4215 // Check the default arguments, which we may have added. 4216 if (!Method->isInvalidDecl()) 4217 CheckCXXDefaultArguments(Method); 4218} 4219 4220/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4221/// the well-formedness of the constructor declarator @p D with type @p 4222/// R. If there are any errors in the declarator, this routine will 4223/// emit diagnostics and set the invalid bit to true. In any case, the type 4224/// will be updated to reflect a well-formed type for the constructor and 4225/// returned. 4226QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4227 StorageClass &SC) { 4228 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4229 4230 // C++ [class.ctor]p3: 4231 // A constructor shall not be virtual (10.3) or static (9.4). A 4232 // constructor can be invoked for a const, volatile or const 4233 // volatile object. A constructor shall not be declared const, 4234 // volatile, or const volatile (9.3.2). 4235 if (isVirtual) { 4236 if (!D.isInvalidType()) 4237 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4238 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4239 << SourceRange(D.getIdentifierLoc()); 4240 D.setInvalidType(); 4241 } 4242 if (SC == SC_Static) { 4243 if (!D.isInvalidType()) 4244 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4245 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4246 << SourceRange(D.getIdentifierLoc()); 4247 D.setInvalidType(); 4248 SC = SC_None; 4249 } 4250 4251 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4252 if (FTI.TypeQuals != 0) { 4253 if (FTI.TypeQuals & Qualifiers::Const) 4254 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4255 << "const" << SourceRange(D.getIdentifierLoc()); 4256 if (FTI.TypeQuals & Qualifiers::Volatile) 4257 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4258 << "volatile" << SourceRange(D.getIdentifierLoc()); 4259 if (FTI.TypeQuals & Qualifiers::Restrict) 4260 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4261 << "restrict" << SourceRange(D.getIdentifierLoc()); 4262 D.setInvalidType(); 4263 } 4264 4265 // C++0x [class.ctor]p4: 4266 // A constructor shall not be declared with a ref-qualifier. 4267 if (FTI.hasRefQualifier()) { 4268 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4269 << FTI.RefQualifierIsLValueRef 4270 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4271 D.setInvalidType(); 4272 } 4273 4274 // Rebuild the function type "R" without any type qualifiers (in 4275 // case any of the errors above fired) and with "void" as the 4276 // return type, since constructors don't have return types. 4277 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4278 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4279 return R; 4280 4281 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4282 EPI.TypeQuals = 0; 4283 EPI.RefQualifier = RQ_None; 4284 4285 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4286 Proto->getNumArgs(), EPI); 4287} 4288 4289/// CheckConstructor - Checks a fully-formed constructor for 4290/// well-formedness, issuing any diagnostics required. Returns true if 4291/// the constructor declarator is invalid. 4292void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4293 CXXRecordDecl *ClassDecl 4294 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4295 if (!ClassDecl) 4296 return Constructor->setInvalidDecl(); 4297 4298 // C++ [class.copy]p3: 4299 // A declaration of a constructor for a class X is ill-formed if 4300 // its first parameter is of type (optionally cv-qualified) X and 4301 // either there are no other parameters or else all other 4302 // parameters have default arguments. 4303 if (!Constructor->isInvalidDecl() && 4304 ((Constructor->getNumParams() == 1) || 4305 (Constructor->getNumParams() > 1 && 4306 Constructor->getParamDecl(1)->hasDefaultArg())) && 4307 Constructor->getTemplateSpecializationKind() 4308 != TSK_ImplicitInstantiation) { 4309 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4310 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4311 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4312 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4313 const char *ConstRef 4314 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4315 : " const &"; 4316 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4317 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4318 4319 // FIXME: Rather that making the constructor invalid, we should endeavor 4320 // to fix the type. 4321 Constructor->setInvalidDecl(); 4322 } 4323 } 4324} 4325 4326/// CheckDestructor - Checks a fully-formed destructor definition for 4327/// well-formedness, issuing any diagnostics required. Returns true 4328/// on error. 4329bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4330 CXXRecordDecl *RD = Destructor->getParent(); 4331 4332 if (Destructor->isVirtual()) { 4333 SourceLocation Loc; 4334 4335 if (!Destructor->isImplicit()) 4336 Loc = Destructor->getLocation(); 4337 else 4338 Loc = RD->getLocation(); 4339 4340 // If we have a virtual destructor, look up the deallocation function 4341 FunctionDecl *OperatorDelete = 0; 4342 DeclarationName Name = 4343 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4344 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4345 return true; 4346 4347 MarkDeclarationReferenced(Loc, OperatorDelete); 4348 4349 Destructor->setOperatorDelete(OperatorDelete); 4350 } 4351 4352 return false; 4353} 4354 4355static inline bool 4356FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4357 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4358 FTI.ArgInfo[0].Param && 4359 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4360} 4361 4362/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4363/// the well-formednes of the destructor declarator @p D with type @p 4364/// R. If there are any errors in the declarator, this routine will 4365/// emit diagnostics and set the declarator to invalid. Even if this happens, 4366/// will be updated to reflect a well-formed type for the destructor and 4367/// returned. 4368QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4369 StorageClass& SC) { 4370 // C++ [class.dtor]p1: 4371 // [...] A typedef-name that names a class is a class-name 4372 // (7.1.3); however, a typedef-name that names a class shall not 4373 // be used as the identifier in the declarator for a destructor 4374 // declaration. 4375 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4376 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4377 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4378 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4379 else if (const TemplateSpecializationType *TST = 4380 DeclaratorType->getAs<TemplateSpecializationType>()) 4381 if (TST->isTypeAlias()) 4382 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4383 << DeclaratorType << 1; 4384 4385 // C++ [class.dtor]p2: 4386 // A destructor is used to destroy objects of its class type. A 4387 // destructor takes no parameters, and no return type can be 4388 // specified for it (not even void). The address of a destructor 4389 // shall not be taken. A destructor shall not be static. A 4390 // destructor can be invoked for a const, volatile or const 4391 // volatile object. A destructor shall not be declared const, 4392 // volatile or const volatile (9.3.2). 4393 if (SC == SC_Static) { 4394 if (!D.isInvalidType()) 4395 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4396 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4397 << SourceRange(D.getIdentifierLoc()) 4398 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4399 4400 SC = SC_None; 4401 } 4402 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4403 // Destructors don't have return types, but the parser will 4404 // happily parse something like: 4405 // 4406 // class X { 4407 // float ~X(); 4408 // }; 4409 // 4410 // The return type will be eliminated later. 4411 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4412 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4413 << SourceRange(D.getIdentifierLoc()); 4414 } 4415 4416 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4417 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4418 if (FTI.TypeQuals & Qualifiers::Const) 4419 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4420 << "const" << SourceRange(D.getIdentifierLoc()); 4421 if (FTI.TypeQuals & Qualifiers::Volatile) 4422 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4423 << "volatile" << SourceRange(D.getIdentifierLoc()); 4424 if (FTI.TypeQuals & Qualifiers::Restrict) 4425 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4426 << "restrict" << SourceRange(D.getIdentifierLoc()); 4427 D.setInvalidType(); 4428 } 4429 4430 // C++0x [class.dtor]p2: 4431 // A destructor shall not be declared with a ref-qualifier. 4432 if (FTI.hasRefQualifier()) { 4433 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4434 << FTI.RefQualifierIsLValueRef 4435 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4436 D.setInvalidType(); 4437 } 4438 4439 // Make sure we don't have any parameters. 4440 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4441 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4442 4443 // Delete the parameters. 4444 FTI.freeArgs(); 4445 D.setInvalidType(); 4446 } 4447 4448 // Make sure the destructor isn't variadic. 4449 if (FTI.isVariadic) { 4450 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4451 D.setInvalidType(); 4452 } 4453 4454 // Rebuild the function type "R" without any type qualifiers or 4455 // parameters (in case any of the errors above fired) and with 4456 // "void" as the return type, since destructors don't have return 4457 // types. 4458 if (!D.isInvalidType()) 4459 return R; 4460 4461 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4462 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4463 EPI.Variadic = false; 4464 EPI.TypeQuals = 0; 4465 EPI.RefQualifier = RQ_None; 4466 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4467} 4468 4469/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4470/// well-formednes of the conversion function declarator @p D with 4471/// type @p R. If there are any errors in the declarator, this routine 4472/// will emit diagnostics and return true. Otherwise, it will return 4473/// false. Either way, the type @p R will be updated to reflect a 4474/// well-formed type for the conversion operator. 4475void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4476 StorageClass& SC) { 4477 // C++ [class.conv.fct]p1: 4478 // Neither parameter types nor return type can be specified. The 4479 // type of a conversion function (8.3.5) is "function taking no 4480 // parameter returning conversion-type-id." 4481 if (SC == SC_Static) { 4482 if (!D.isInvalidType()) 4483 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4484 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4485 << SourceRange(D.getIdentifierLoc()); 4486 D.setInvalidType(); 4487 SC = SC_None; 4488 } 4489 4490 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4491 4492 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4493 // Conversion functions don't have return types, but the parser will 4494 // happily parse something like: 4495 // 4496 // class X { 4497 // float operator bool(); 4498 // }; 4499 // 4500 // The return type will be changed later anyway. 4501 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4502 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4503 << SourceRange(D.getIdentifierLoc()); 4504 D.setInvalidType(); 4505 } 4506 4507 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4508 4509 // Make sure we don't have any parameters. 4510 if (Proto->getNumArgs() > 0) { 4511 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4512 4513 // Delete the parameters. 4514 D.getFunctionTypeInfo().freeArgs(); 4515 D.setInvalidType(); 4516 } else if (Proto->isVariadic()) { 4517 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4518 D.setInvalidType(); 4519 } 4520 4521 // Diagnose "&operator bool()" and other such nonsense. This 4522 // is actually a gcc extension which we don't support. 4523 if (Proto->getResultType() != ConvType) { 4524 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4525 << Proto->getResultType(); 4526 D.setInvalidType(); 4527 ConvType = Proto->getResultType(); 4528 } 4529 4530 // C++ [class.conv.fct]p4: 4531 // The conversion-type-id shall not represent a function type nor 4532 // an array type. 4533 if (ConvType->isArrayType()) { 4534 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4535 ConvType = Context.getPointerType(ConvType); 4536 D.setInvalidType(); 4537 } else if (ConvType->isFunctionType()) { 4538 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4539 ConvType = Context.getPointerType(ConvType); 4540 D.setInvalidType(); 4541 } 4542 4543 // Rebuild the function type "R" without any parameters (in case any 4544 // of the errors above fired) and with the conversion type as the 4545 // return type. 4546 if (D.isInvalidType()) 4547 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4548 4549 // C++0x explicit conversion operators. 4550 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4551 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4552 diag::warn_explicit_conversion_functions) 4553 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4554} 4555 4556/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4557/// the declaration of the given C++ conversion function. This routine 4558/// is responsible for recording the conversion function in the C++ 4559/// class, if possible. 4560Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4561 assert(Conversion && "Expected to receive a conversion function declaration"); 4562 4563 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4564 4565 // Make sure we aren't redeclaring the conversion function. 4566 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4567 4568 // C++ [class.conv.fct]p1: 4569 // [...] A conversion function is never used to convert a 4570 // (possibly cv-qualified) object to the (possibly cv-qualified) 4571 // same object type (or a reference to it), to a (possibly 4572 // cv-qualified) base class of that type (or a reference to it), 4573 // or to (possibly cv-qualified) void. 4574 // FIXME: Suppress this warning if the conversion function ends up being a 4575 // virtual function that overrides a virtual function in a base class. 4576 QualType ClassType 4577 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4578 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4579 ConvType = ConvTypeRef->getPointeeType(); 4580 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4581 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4582 /* Suppress diagnostics for instantiations. */; 4583 else if (ConvType->isRecordType()) { 4584 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4585 if (ConvType == ClassType) 4586 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4587 << ClassType; 4588 else if (IsDerivedFrom(ClassType, ConvType)) 4589 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4590 << ClassType << ConvType; 4591 } else if (ConvType->isVoidType()) { 4592 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4593 << ClassType << ConvType; 4594 } 4595 4596 if (FunctionTemplateDecl *ConversionTemplate 4597 = Conversion->getDescribedFunctionTemplate()) 4598 return ConversionTemplate; 4599 4600 return Conversion; 4601} 4602 4603//===----------------------------------------------------------------------===// 4604// Namespace Handling 4605//===----------------------------------------------------------------------===// 4606 4607 4608 4609/// ActOnStartNamespaceDef - This is called at the start of a namespace 4610/// definition. 4611Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4612 SourceLocation InlineLoc, 4613 SourceLocation NamespaceLoc, 4614 SourceLocation IdentLoc, 4615 IdentifierInfo *II, 4616 SourceLocation LBrace, 4617 AttributeList *AttrList) { 4618 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4619 // For anonymous namespace, take the location of the left brace. 4620 SourceLocation Loc = II ? IdentLoc : LBrace; 4621 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4622 StartLoc, Loc, II); 4623 Namespc->setInline(InlineLoc.isValid()); 4624 4625 Scope *DeclRegionScope = NamespcScope->getParent(); 4626 4627 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4628 4629 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4630 PushNamespaceVisibilityAttr(Attr); 4631 4632 if (II) { 4633 // C++ [namespace.def]p2: 4634 // The identifier in an original-namespace-definition shall not 4635 // have been previously defined in the declarative region in 4636 // which the original-namespace-definition appears. The 4637 // identifier in an original-namespace-definition is the name of 4638 // the namespace. Subsequently in that declarative region, it is 4639 // treated as an original-namespace-name. 4640 // 4641 // Since namespace names are unique in their scope, and we don't 4642 // look through using directives, just look for any ordinary names. 4643 4644 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4645 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4646 Decl::IDNS_Namespace; 4647 NamedDecl *PrevDecl = 0; 4648 for (DeclContext::lookup_result R 4649 = CurContext->getRedeclContext()->lookup(II); 4650 R.first != R.second; ++R.first) { 4651 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4652 PrevDecl = *R.first; 4653 break; 4654 } 4655 } 4656 4657 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4658 // This is an extended namespace definition. 4659 if (Namespc->isInline() != OrigNS->isInline()) { 4660 // inline-ness must match 4661 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4662 << Namespc->isInline(); 4663 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4664 Namespc->setInvalidDecl(); 4665 // Recover by ignoring the new namespace's inline status. 4666 Namespc->setInline(OrigNS->isInline()); 4667 } 4668 4669 // Attach this namespace decl to the chain of extended namespace 4670 // definitions. 4671 OrigNS->setNextNamespace(Namespc); 4672 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4673 4674 // Remove the previous declaration from the scope. 4675 if (DeclRegionScope->isDeclScope(OrigNS)) { 4676 IdResolver.RemoveDecl(OrigNS); 4677 DeclRegionScope->RemoveDecl(OrigNS); 4678 } 4679 } else if (PrevDecl) { 4680 // This is an invalid name redefinition. 4681 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4682 << Namespc->getDeclName(); 4683 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4684 Namespc->setInvalidDecl(); 4685 // Continue on to push Namespc as current DeclContext and return it. 4686 } else if (II->isStr("std") && 4687 CurContext->getRedeclContext()->isTranslationUnit()) { 4688 // This is the first "real" definition of the namespace "std", so update 4689 // our cache of the "std" namespace to point at this definition. 4690 if (NamespaceDecl *StdNS = getStdNamespace()) { 4691 // We had already defined a dummy namespace "std". Link this new 4692 // namespace definition to the dummy namespace "std". 4693 StdNS->setNextNamespace(Namespc); 4694 StdNS->setLocation(IdentLoc); 4695 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4696 } 4697 4698 // Make our StdNamespace cache point at the first real definition of the 4699 // "std" namespace. 4700 StdNamespace = Namespc; 4701 } 4702 4703 PushOnScopeChains(Namespc, DeclRegionScope); 4704 } else { 4705 // Anonymous namespaces. 4706 assert(Namespc->isAnonymousNamespace()); 4707 4708 // Link the anonymous namespace into its parent. 4709 NamespaceDecl *PrevDecl; 4710 DeclContext *Parent = CurContext->getRedeclContext(); 4711 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4712 PrevDecl = TU->getAnonymousNamespace(); 4713 TU->setAnonymousNamespace(Namespc); 4714 } else { 4715 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4716 PrevDecl = ND->getAnonymousNamespace(); 4717 ND->setAnonymousNamespace(Namespc); 4718 } 4719 4720 // Link the anonymous namespace with its previous declaration. 4721 if (PrevDecl) { 4722 assert(PrevDecl->isAnonymousNamespace()); 4723 assert(!PrevDecl->getNextNamespace()); 4724 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4725 PrevDecl->setNextNamespace(Namespc); 4726 4727 if (Namespc->isInline() != PrevDecl->isInline()) { 4728 // inline-ness must match 4729 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4730 << Namespc->isInline(); 4731 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4732 Namespc->setInvalidDecl(); 4733 // Recover by ignoring the new namespace's inline status. 4734 Namespc->setInline(PrevDecl->isInline()); 4735 } 4736 } 4737 4738 CurContext->addDecl(Namespc); 4739 4740 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4741 // behaves as if it were replaced by 4742 // namespace unique { /* empty body */ } 4743 // using namespace unique; 4744 // namespace unique { namespace-body } 4745 // where all occurrences of 'unique' in a translation unit are 4746 // replaced by the same identifier and this identifier differs 4747 // from all other identifiers in the entire program. 4748 4749 // We just create the namespace with an empty name and then add an 4750 // implicit using declaration, just like the standard suggests. 4751 // 4752 // CodeGen enforces the "universally unique" aspect by giving all 4753 // declarations semantically contained within an anonymous 4754 // namespace internal linkage. 4755 4756 if (!PrevDecl) { 4757 UsingDirectiveDecl* UD 4758 = UsingDirectiveDecl::Create(Context, CurContext, 4759 /* 'using' */ LBrace, 4760 /* 'namespace' */ SourceLocation(), 4761 /* qualifier */ NestedNameSpecifierLoc(), 4762 /* identifier */ SourceLocation(), 4763 Namespc, 4764 /* Ancestor */ CurContext); 4765 UD->setImplicit(); 4766 CurContext->addDecl(UD); 4767 } 4768 } 4769 4770 // Although we could have an invalid decl (i.e. the namespace name is a 4771 // redefinition), push it as current DeclContext and try to continue parsing. 4772 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4773 // for the namespace has the declarations that showed up in that particular 4774 // namespace definition. 4775 PushDeclContext(NamespcScope, Namespc); 4776 return Namespc; 4777} 4778 4779/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4780/// is a namespace alias, returns the namespace it points to. 4781static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4782 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4783 return AD->getNamespace(); 4784 return dyn_cast_or_null<NamespaceDecl>(D); 4785} 4786 4787/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4788/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4789void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4790 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4791 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4792 Namespc->setRBraceLoc(RBrace); 4793 PopDeclContext(); 4794 if (Namespc->hasAttr<VisibilityAttr>()) 4795 PopPragmaVisibility(); 4796} 4797 4798CXXRecordDecl *Sema::getStdBadAlloc() const { 4799 return cast_or_null<CXXRecordDecl>( 4800 StdBadAlloc.get(Context.getExternalSource())); 4801} 4802 4803NamespaceDecl *Sema::getStdNamespace() const { 4804 return cast_or_null<NamespaceDecl>( 4805 StdNamespace.get(Context.getExternalSource())); 4806} 4807 4808/// \brief Retrieve the special "std" namespace, which may require us to 4809/// implicitly define the namespace. 4810NamespaceDecl *Sema::getOrCreateStdNamespace() { 4811 if (!StdNamespace) { 4812 // The "std" namespace has not yet been defined, so build one implicitly. 4813 StdNamespace = NamespaceDecl::Create(Context, 4814 Context.getTranslationUnitDecl(), 4815 SourceLocation(), SourceLocation(), 4816 &PP.getIdentifierTable().get("std")); 4817 getStdNamespace()->setImplicit(true); 4818 } 4819 4820 return getStdNamespace(); 4821} 4822 4823/// \brief Determine whether a using statement is in a context where it will be 4824/// apply in all contexts. 4825static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4826 switch (CurContext->getDeclKind()) { 4827 case Decl::TranslationUnit: 4828 return true; 4829 case Decl::LinkageSpec: 4830 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4831 default: 4832 return false; 4833 } 4834} 4835 4836Decl *Sema::ActOnUsingDirective(Scope *S, 4837 SourceLocation UsingLoc, 4838 SourceLocation NamespcLoc, 4839 CXXScopeSpec &SS, 4840 SourceLocation IdentLoc, 4841 IdentifierInfo *NamespcName, 4842 AttributeList *AttrList) { 4843 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4844 assert(NamespcName && "Invalid NamespcName."); 4845 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4846 4847 // This can only happen along a recovery path. 4848 while (S->getFlags() & Scope::TemplateParamScope) 4849 S = S->getParent(); 4850 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4851 4852 UsingDirectiveDecl *UDir = 0; 4853 NestedNameSpecifier *Qualifier = 0; 4854 if (SS.isSet()) 4855 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4856 4857 // Lookup namespace name. 4858 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4859 LookupParsedName(R, S, &SS); 4860 if (R.isAmbiguous()) 4861 return 0; 4862 4863 if (R.empty()) { 4864 // Allow "using namespace std;" or "using namespace ::std;" even if 4865 // "std" hasn't been defined yet, for GCC compatibility. 4866 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4867 NamespcName->isStr("std")) { 4868 Diag(IdentLoc, diag::ext_using_undefined_std); 4869 R.addDecl(getOrCreateStdNamespace()); 4870 R.resolveKind(); 4871 } 4872 // Otherwise, attempt typo correction. 4873 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4874 CTC_NoKeywords, 0)) { 4875 if (R.getAsSingle<NamespaceDecl>() || 4876 R.getAsSingle<NamespaceAliasDecl>()) { 4877 if (DeclContext *DC = computeDeclContext(SS, false)) 4878 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4879 << NamespcName << DC << Corrected << SS.getRange() 4880 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4881 else 4882 Diag(IdentLoc, diag::err_using_directive_suggest) 4883 << NamespcName << Corrected 4884 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4885 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4886 << Corrected; 4887 4888 NamespcName = Corrected.getAsIdentifierInfo(); 4889 } else { 4890 R.clear(); 4891 R.setLookupName(NamespcName); 4892 } 4893 } 4894 } 4895 4896 if (!R.empty()) { 4897 NamedDecl *Named = R.getFoundDecl(); 4898 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4899 && "expected namespace decl"); 4900 // C++ [namespace.udir]p1: 4901 // A using-directive specifies that the names in the nominated 4902 // namespace can be used in the scope in which the 4903 // using-directive appears after the using-directive. During 4904 // unqualified name lookup (3.4.1), the names appear as if they 4905 // were declared in the nearest enclosing namespace which 4906 // contains both the using-directive and the nominated 4907 // namespace. [Note: in this context, "contains" means "contains 4908 // directly or indirectly". ] 4909 4910 // Find enclosing context containing both using-directive and 4911 // nominated namespace. 4912 NamespaceDecl *NS = getNamespaceDecl(Named); 4913 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4914 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4915 CommonAncestor = CommonAncestor->getParent(); 4916 4917 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4918 SS.getWithLocInContext(Context), 4919 IdentLoc, Named, CommonAncestor); 4920 4921 if (IsUsingDirectiveInToplevelContext(CurContext) && 4922 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4923 Diag(IdentLoc, diag::warn_using_directive_in_header); 4924 } 4925 4926 PushUsingDirective(S, UDir); 4927 } else { 4928 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4929 } 4930 4931 // FIXME: We ignore attributes for now. 4932 return UDir; 4933} 4934 4935void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4936 // If scope has associated entity, then using directive is at namespace 4937 // or translation unit scope. We add UsingDirectiveDecls, into 4938 // it's lookup structure. 4939 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4940 Ctx->addDecl(UDir); 4941 else 4942 // Otherwise it is block-sope. using-directives will affect lookup 4943 // only to the end of scope. 4944 S->PushUsingDirective(UDir); 4945} 4946 4947 4948Decl *Sema::ActOnUsingDeclaration(Scope *S, 4949 AccessSpecifier AS, 4950 bool HasUsingKeyword, 4951 SourceLocation UsingLoc, 4952 CXXScopeSpec &SS, 4953 UnqualifiedId &Name, 4954 AttributeList *AttrList, 4955 bool IsTypeName, 4956 SourceLocation TypenameLoc) { 4957 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4958 4959 switch (Name.getKind()) { 4960 case UnqualifiedId::IK_Identifier: 4961 case UnqualifiedId::IK_OperatorFunctionId: 4962 case UnqualifiedId::IK_LiteralOperatorId: 4963 case UnqualifiedId::IK_ConversionFunctionId: 4964 break; 4965 4966 case UnqualifiedId::IK_ConstructorName: 4967 case UnqualifiedId::IK_ConstructorTemplateId: 4968 // C++0x inherited constructors. 4969 if (getLangOptions().CPlusPlus0x) break; 4970 4971 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4972 << SS.getRange(); 4973 return 0; 4974 4975 case UnqualifiedId::IK_DestructorName: 4976 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4977 << SS.getRange(); 4978 return 0; 4979 4980 case UnqualifiedId::IK_TemplateId: 4981 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4982 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4983 return 0; 4984 } 4985 4986 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4987 DeclarationName TargetName = TargetNameInfo.getName(); 4988 if (!TargetName) 4989 return 0; 4990 4991 // Warn about using declarations. 4992 // TODO: store that the declaration was written without 'using' and 4993 // talk about access decls instead of using decls in the 4994 // diagnostics. 4995 if (!HasUsingKeyword) { 4996 UsingLoc = Name.getSourceRange().getBegin(); 4997 4998 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4999 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5000 } 5001 5002 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5003 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5004 return 0; 5005 5006 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5007 TargetNameInfo, AttrList, 5008 /* IsInstantiation */ false, 5009 IsTypeName, TypenameLoc); 5010 if (UD) 5011 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5012 5013 return UD; 5014} 5015 5016/// \brief Determine whether a using declaration considers the given 5017/// declarations as "equivalent", e.g., if they are redeclarations of 5018/// the same entity or are both typedefs of the same type. 5019static bool 5020IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5021 bool &SuppressRedeclaration) { 5022 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5023 SuppressRedeclaration = false; 5024 return true; 5025 } 5026 5027 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5028 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5029 SuppressRedeclaration = true; 5030 return Context.hasSameType(TD1->getUnderlyingType(), 5031 TD2->getUnderlyingType()); 5032 } 5033 5034 return false; 5035} 5036 5037 5038/// Determines whether to create a using shadow decl for a particular 5039/// decl, given the set of decls existing prior to this using lookup. 5040bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5041 const LookupResult &Previous) { 5042 // Diagnose finding a decl which is not from a base class of the 5043 // current class. We do this now because there are cases where this 5044 // function will silently decide not to build a shadow decl, which 5045 // will pre-empt further diagnostics. 5046 // 5047 // We don't need to do this in C++0x because we do the check once on 5048 // the qualifier. 5049 // 5050 // FIXME: diagnose the following if we care enough: 5051 // struct A { int foo; }; 5052 // struct B : A { using A::foo; }; 5053 // template <class T> struct C : A {}; 5054 // template <class T> struct D : C<T> { using B::foo; } // <--- 5055 // This is invalid (during instantiation) in C++03 because B::foo 5056 // resolves to the using decl in B, which is not a base class of D<T>. 5057 // We can't diagnose it immediately because C<T> is an unknown 5058 // specialization. The UsingShadowDecl in D<T> then points directly 5059 // to A::foo, which will look well-formed when we instantiate. 5060 // The right solution is to not collapse the shadow-decl chain. 5061 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5062 DeclContext *OrigDC = Orig->getDeclContext(); 5063 5064 // Handle enums and anonymous structs. 5065 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5066 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5067 while (OrigRec->isAnonymousStructOrUnion()) 5068 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5069 5070 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5071 if (OrigDC == CurContext) { 5072 Diag(Using->getLocation(), 5073 diag::err_using_decl_nested_name_specifier_is_current_class) 5074 << Using->getQualifierLoc().getSourceRange(); 5075 Diag(Orig->getLocation(), diag::note_using_decl_target); 5076 return true; 5077 } 5078 5079 Diag(Using->getQualifierLoc().getBeginLoc(), 5080 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5081 << Using->getQualifier() 5082 << cast<CXXRecordDecl>(CurContext) 5083 << Using->getQualifierLoc().getSourceRange(); 5084 Diag(Orig->getLocation(), diag::note_using_decl_target); 5085 return true; 5086 } 5087 } 5088 5089 if (Previous.empty()) return false; 5090 5091 NamedDecl *Target = Orig; 5092 if (isa<UsingShadowDecl>(Target)) 5093 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5094 5095 // If the target happens to be one of the previous declarations, we 5096 // don't have a conflict. 5097 // 5098 // FIXME: but we might be increasing its access, in which case we 5099 // should redeclare it. 5100 NamedDecl *NonTag = 0, *Tag = 0; 5101 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5102 I != E; ++I) { 5103 NamedDecl *D = (*I)->getUnderlyingDecl(); 5104 bool Result; 5105 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5106 return Result; 5107 5108 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5109 } 5110 5111 if (Target->isFunctionOrFunctionTemplate()) { 5112 FunctionDecl *FD; 5113 if (isa<FunctionTemplateDecl>(Target)) 5114 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5115 else 5116 FD = cast<FunctionDecl>(Target); 5117 5118 NamedDecl *OldDecl = 0; 5119 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5120 case Ovl_Overload: 5121 return false; 5122 5123 case Ovl_NonFunction: 5124 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5125 break; 5126 5127 // We found a decl with the exact signature. 5128 case Ovl_Match: 5129 // If we're in a record, we want to hide the target, so we 5130 // return true (without a diagnostic) to tell the caller not to 5131 // build a shadow decl. 5132 if (CurContext->isRecord()) 5133 return true; 5134 5135 // If we're not in a record, this is an error. 5136 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5137 break; 5138 } 5139 5140 Diag(Target->getLocation(), diag::note_using_decl_target); 5141 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5142 return true; 5143 } 5144 5145 // Target is not a function. 5146 5147 if (isa<TagDecl>(Target)) { 5148 // No conflict between a tag and a non-tag. 5149 if (!Tag) return false; 5150 5151 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5152 Diag(Target->getLocation(), diag::note_using_decl_target); 5153 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5154 return true; 5155 } 5156 5157 // No conflict between a tag and a non-tag. 5158 if (!NonTag) return false; 5159 5160 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5161 Diag(Target->getLocation(), diag::note_using_decl_target); 5162 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5163 return true; 5164} 5165 5166/// Builds a shadow declaration corresponding to a 'using' declaration. 5167UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5168 UsingDecl *UD, 5169 NamedDecl *Orig) { 5170 5171 // If we resolved to another shadow declaration, just coalesce them. 5172 NamedDecl *Target = Orig; 5173 if (isa<UsingShadowDecl>(Target)) { 5174 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5175 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5176 } 5177 5178 UsingShadowDecl *Shadow 5179 = UsingShadowDecl::Create(Context, CurContext, 5180 UD->getLocation(), UD, Target); 5181 UD->addShadowDecl(Shadow); 5182 5183 Shadow->setAccess(UD->getAccess()); 5184 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5185 Shadow->setInvalidDecl(); 5186 5187 if (S) 5188 PushOnScopeChains(Shadow, S); 5189 else 5190 CurContext->addDecl(Shadow); 5191 5192 5193 return Shadow; 5194} 5195 5196/// Hides a using shadow declaration. This is required by the current 5197/// using-decl implementation when a resolvable using declaration in a 5198/// class is followed by a declaration which would hide or override 5199/// one or more of the using decl's targets; for example: 5200/// 5201/// struct Base { void foo(int); }; 5202/// struct Derived : Base { 5203/// using Base::foo; 5204/// void foo(int); 5205/// }; 5206/// 5207/// The governing language is C++03 [namespace.udecl]p12: 5208/// 5209/// When a using-declaration brings names from a base class into a 5210/// derived class scope, member functions in the derived class 5211/// override and/or hide member functions with the same name and 5212/// parameter types in a base class (rather than conflicting). 5213/// 5214/// There are two ways to implement this: 5215/// (1) optimistically create shadow decls when they're not hidden 5216/// by existing declarations, or 5217/// (2) don't create any shadow decls (or at least don't make them 5218/// visible) until we've fully parsed/instantiated the class. 5219/// The problem with (1) is that we might have to retroactively remove 5220/// a shadow decl, which requires several O(n) operations because the 5221/// decl structures are (very reasonably) not designed for removal. 5222/// (2) avoids this but is very fiddly and phase-dependent. 5223void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5224 if (Shadow->getDeclName().getNameKind() == 5225 DeclarationName::CXXConversionFunctionName) 5226 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5227 5228 // Remove it from the DeclContext... 5229 Shadow->getDeclContext()->removeDecl(Shadow); 5230 5231 // ...and the scope, if applicable... 5232 if (S) { 5233 S->RemoveDecl(Shadow); 5234 IdResolver.RemoveDecl(Shadow); 5235 } 5236 5237 // ...and the using decl. 5238 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5239 5240 // TODO: complain somehow if Shadow was used. It shouldn't 5241 // be possible for this to happen, because...? 5242} 5243 5244/// Builds a using declaration. 5245/// 5246/// \param IsInstantiation - Whether this call arises from an 5247/// instantiation of an unresolved using declaration. We treat 5248/// the lookup differently for these declarations. 5249NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5250 SourceLocation UsingLoc, 5251 CXXScopeSpec &SS, 5252 const DeclarationNameInfo &NameInfo, 5253 AttributeList *AttrList, 5254 bool IsInstantiation, 5255 bool IsTypeName, 5256 SourceLocation TypenameLoc) { 5257 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5258 SourceLocation IdentLoc = NameInfo.getLoc(); 5259 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5260 5261 // FIXME: We ignore attributes for now. 5262 5263 if (SS.isEmpty()) { 5264 Diag(IdentLoc, diag::err_using_requires_qualname); 5265 return 0; 5266 } 5267 5268 // Do the redeclaration lookup in the current scope. 5269 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5270 ForRedeclaration); 5271 Previous.setHideTags(false); 5272 if (S) { 5273 LookupName(Previous, S); 5274 5275 // It is really dumb that we have to do this. 5276 LookupResult::Filter F = Previous.makeFilter(); 5277 while (F.hasNext()) { 5278 NamedDecl *D = F.next(); 5279 if (!isDeclInScope(D, CurContext, S)) 5280 F.erase(); 5281 } 5282 F.done(); 5283 } else { 5284 assert(IsInstantiation && "no scope in non-instantiation"); 5285 assert(CurContext->isRecord() && "scope not record in instantiation"); 5286 LookupQualifiedName(Previous, CurContext); 5287 } 5288 5289 // Check for invalid redeclarations. 5290 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5291 return 0; 5292 5293 // Check for bad qualifiers. 5294 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5295 return 0; 5296 5297 DeclContext *LookupContext = computeDeclContext(SS); 5298 NamedDecl *D; 5299 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5300 if (!LookupContext) { 5301 if (IsTypeName) { 5302 // FIXME: not all declaration name kinds are legal here 5303 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5304 UsingLoc, TypenameLoc, 5305 QualifierLoc, 5306 IdentLoc, NameInfo.getName()); 5307 } else { 5308 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5309 QualifierLoc, NameInfo); 5310 } 5311 } else { 5312 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5313 NameInfo, IsTypeName); 5314 } 5315 D->setAccess(AS); 5316 CurContext->addDecl(D); 5317 5318 if (!LookupContext) return D; 5319 UsingDecl *UD = cast<UsingDecl>(D); 5320 5321 if (RequireCompleteDeclContext(SS, LookupContext)) { 5322 UD->setInvalidDecl(); 5323 return UD; 5324 } 5325 5326 // Constructor inheriting using decls get special treatment. 5327 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5328 if (CheckInheritedConstructorUsingDecl(UD)) 5329 UD->setInvalidDecl(); 5330 return UD; 5331 } 5332 5333 // Otherwise, look up the target name. 5334 5335 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5336 5337 // Unlike most lookups, we don't always want to hide tag 5338 // declarations: tag names are visible through the using declaration 5339 // even if hidden by ordinary names, *except* in a dependent context 5340 // where it's important for the sanity of two-phase lookup. 5341 if (!IsInstantiation) 5342 R.setHideTags(false); 5343 5344 LookupQualifiedName(R, LookupContext); 5345 5346 if (R.empty()) { 5347 Diag(IdentLoc, diag::err_no_member) 5348 << NameInfo.getName() << LookupContext << SS.getRange(); 5349 UD->setInvalidDecl(); 5350 return UD; 5351 } 5352 5353 if (R.isAmbiguous()) { 5354 UD->setInvalidDecl(); 5355 return UD; 5356 } 5357 5358 if (IsTypeName) { 5359 // If we asked for a typename and got a non-type decl, error out. 5360 if (!R.getAsSingle<TypeDecl>()) { 5361 Diag(IdentLoc, diag::err_using_typename_non_type); 5362 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5363 Diag((*I)->getUnderlyingDecl()->getLocation(), 5364 diag::note_using_decl_target); 5365 UD->setInvalidDecl(); 5366 return UD; 5367 } 5368 } else { 5369 // If we asked for a non-typename and we got a type, error out, 5370 // but only if this is an instantiation of an unresolved using 5371 // decl. Otherwise just silently find the type name. 5372 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5373 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5374 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5375 UD->setInvalidDecl(); 5376 return UD; 5377 } 5378 } 5379 5380 // C++0x N2914 [namespace.udecl]p6: 5381 // A using-declaration shall not name a namespace. 5382 if (R.getAsSingle<NamespaceDecl>()) { 5383 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5384 << SS.getRange(); 5385 UD->setInvalidDecl(); 5386 return UD; 5387 } 5388 5389 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5390 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5391 BuildUsingShadowDecl(S, UD, *I); 5392 } 5393 5394 return UD; 5395} 5396 5397/// Additional checks for a using declaration referring to a constructor name. 5398bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5399 if (UD->isTypeName()) { 5400 // FIXME: Cannot specify typename when specifying constructor 5401 return true; 5402 } 5403 5404 const Type *SourceType = UD->getQualifier()->getAsType(); 5405 assert(SourceType && 5406 "Using decl naming constructor doesn't have type in scope spec."); 5407 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5408 5409 // Check whether the named type is a direct base class. 5410 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5411 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5412 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5413 BaseIt != BaseE; ++BaseIt) { 5414 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5415 if (CanonicalSourceType == BaseType) 5416 break; 5417 } 5418 5419 if (BaseIt == BaseE) { 5420 // Did not find SourceType in the bases. 5421 Diag(UD->getUsingLocation(), 5422 diag::err_using_decl_constructor_not_in_direct_base) 5423 << UD->getNameInfo().getSourceRange() 5424 << QualType(SourceType, 0) << TargetClass; 5425 return true; 5426 } 5427 5428 BaseIt->setInheritConstructors(); 5429 5430 return false; 5431} 5432 5433/// Checks that the given using declaration is not an invalid 5434/// redeclaration. Note that this is checking only for the using decl 5435/// itself, not for any ill-formedness among the UsingShadowDecls. 5436bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5437 bool isTypeName, 5438 const CXXScopeSpec &SS, 5439 SourceLocation NameLoc, 5440 const LookupResult &Prev) { 5441 // C++03 [namespace.udecl]p8: 5442 // C++0x [namespace.udecl]p10: 5443 // A using-declaration is a declaration and can therefore be used 5444 // repeatedly where (and only where) multiple declarations are 5445 // allowed. 5446 // 5447 // That's in non-member contexts. 5448 if (!CurContext->getRedeclContext()->isRecord()) 5449 return false; 5450 5451 NestedNameSpecifier *Qual 5452 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5453 5454 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5455 NamedDecl *D = *I; 5456 5457 bool DTypename; 5458 NestedNameSpecifier *DQual; 5459 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5460 DTypename = UD->isTypeName(); 5461 DQual = UD->getQualifier(); 5462 } else if (UnresolvedUsingValueDecl *UD 5463 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5464 DTypename = false; 5465 DQual = UD->getQualifier(); 5466 } else if (UnresolvedUsingTypenameDecl *UD 5467 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5468 DTypename = true; 5469 DQual = UD->getQualifier(); 5470 } else continue; 5471 5472 // using decls differ if one says 'typename' and the other doesn't. 5473 // FIXME: non-dependent using decls? 5474 if (isTypeName != DTypename) continue; 5475 5476 // using decls differ if they name different scopes (but note that 5477 // template instantiation can cause this check to trigger when it 5478 // didn't before instantiation). 5479 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5480 Context.getCanonicalNestedNameSpecifier(DQual)) 5481 continue; 5482 5483 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5484 Diag(D->getLocation(), diag::note_using_decl) << 1; 5485 return true; 5486 } 5487 5488 return false; 5489} 5490 5491 5492/// Checks that the given nested-name qualifier used in a using decl 5493/// in the current context is appropriately related to the current 5494/// scope. If an error is found, diagnoses it and returns true. 5495bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5496 const CXXScopeSpec &SS, 5497 SourceLocation NameLoc) { 5498 DeclContext *NamedContext = computeDeclContext(SS); 5499 5500 if (!CurContext->isRecord()) { 5501 // C++03 [namespace.udecl]p3: 5502 // C++0x [namespace.udecl]p8: 5503 // A using-declaration for a class member shall be a member-declaration. 5504 5505 // If we weren't able to compute a valid scope, it must be a 5506 // dependent class scope. 5507 if (!NamedContext || NamedContext->isRecord()) { 5508 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5509 << SS.getRange(); 5510 return true; 5511 } 5512 5513 // Otherwise, everything is known to be fine. 5514 return false; 5515 } 5516 5517 // The current scope is a record. 5518 5519 // If the named context is dependent, we can't decide much. 5520 if (!NamedContext) { 5521 // FIXME: in C++0x, we can diagnose if we can prove that the 5522 // nested-name-specifier does not refer to a base class, which is 5523 // still possible in some cases. 5524 5525 // Otherwise we have to conservatively report that things might be 5526 // okay. 5527 return false; 5528 } 5529 5530 if (!NamedContext->isRecord()) { 5531 // Ideally this would point at the last name in the specifier, 5532 // but we don't have that level of source info. 5533 Diag(SS.getRange().getBegin(), 5534 diag::err_using_decl_nested_name_specifier_is_not_class) 5535 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5536 return true; 5537 } 5538 5539 if (!NamedContext->isDependentContext() && 5540 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5541 return true; 5542 5543 if (getLangOptions().CPlusPlus0x) { 5544 // C++0x [namespace.udecl]p3: 5545 // In a using-declaration used as a member-declaration, the 5546 // nested-name-specifier shall name a base class of the class 5547 // being defined. 5548 5549 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5550 cast<CXXRecordDecl>(NamedContext))) { 5551 if (CurContext == NamedContext) { 5552 Diag(NameLoc, 5553 diag::err_using_decl_nested_name_specifier_is_current_class) 5554 << SS.getRange(); 5555 return true; 5556 } 5557 5558 Diag(SS.getRange().getBegin(), 5559 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5560 << (NestedNameSpecifier*) SS.getScopeRep() 5561 << cast<CXXRecordDecl>(CurContext) 5562 << SS.getRange(); 5563 return true; 5564 } 5565 5566 return false; 5567 } 5568 5569 // C++03 [namespace.udecl]p4: 5570 // A using-declaration used as a member-declaration shall refer 5571 // to a member of a base class of the class being defined [etc.]. 5572 5573 // Salient point: SS doesn't have to name a base class as long as 5574 // lookup only finds members from base classes. Therefore we can 5575 // diagnose here only if we can prove that that can't happen, 5576 // i.e. if the class hierarchies provably don't intersect. 5577 5578 // TODO: it would be nice if "definitely valid" results were cached 5579 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5580 // need to be repeated. 5581 5582 struct UserData { 5583 llvm::DenseSet<const CXXRecordDecl*> Bases; 5584 5585 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5586 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5587 Data->Bases.insert(Base); 5588 return true; 5589 } 5590 5591 bool hasDependentBases(const CXXRecordDecl *Class) { 5592 return !Class->forallBases(collect, this); 5593 } 5594 5595 /// Returns true if the base is dependent or is one of the 5596 /// accumulated base classes. 5597 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5598 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5599 return !Data->Bases.count(Base); 5600 } 5601 5602 bool mightShareBases(const CXXRecordDecl *Class) { 5603 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5604 } 5605 }; 5606 5607 UserData Data; 5608 5609 // Returns false if we find a dependent base. 5610 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5611 return false; 5612 5613 // Returns false if the class has a dependent base or if it or one 5614 // of its bases is present in the base set of the current context. 5615 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5616 return false; 5617 5618 Diag(SS.getRange().getBegin(), 5619 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5620 << (NestedNameSpecifier*) SS.getScopeRep() 5621 << cast<CXXRecordDecl>(CurContext) 5622 << SS.getRange(); 5623 5624 return true; 5625} 5626 5627Decl *Sema::ActOnAliasDeclaration(Scope *S, 5628 AccessSpecifier AS, 5629 MultiTemplateParamsArg TemplateParamLists, 5630 SourceLocation UsingLoc, 5631 UnqualifiedId &Name, 5632 TypeResult Type) { 5633 // Skip up to the relevant declaration scope. 5634 while (S->getFlags() & Scope::TemplateParamScope) 5635 S = S->getParent(); 5636 assert((S->getFlags() & Scope::DeclScope) && 5637 "got alias-declaration outside of declaration scope"); 5638 5639 if (Type.isInvalid()) 5640 return 0; 5641 5642 bool Invalid = false; 5643 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5644 TypeSourceInfo *TInfo = 0; 5645 GetTypeFromParser(Type.get(), &TInfo); 5646 5647 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5648 return 0; 5649 5650 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5651 UPPC_DeclarationType)) { 5652 Invalid = true; 5653 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5654 TInfo->getTypeLoc().getBeginLoc()); 5655 } 5656 5657 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5658 LookupName(Previous, S); 5659 5660 // Warn about shadowing the name of a template parameter. 5661 if (Previous.isSingleResult() && 5662 Previous.getFoundDecl()->isTemplateParameter()) { 5663 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5664 Previous.getFoundDecl())) 5665 Invalid = true; 5666 Previous.clear(); 5667 } 5668 5669 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5670 "name in alias declaration must be an identifier"); 5671 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5672 Name.StartLocation, 5673 Name.Identifier, TInfo); 5674 5675 NewTD->setAccess(AS); 5676 5677 if (Invalid) 5678 NewTD->setInvalidDecl(); 5679 5680 CheckTypedefForVariablyModifiedType(S, NewTD); 5681 Invalid |= NewTD->isInvalidDecl(); 5682 5683 bool Redeclaration = false; 5684 5685 NamedDecl *NewND; 5686 if (TemplateParamLists.size()) { 5687 TypeAliasTemplateDecl *OldDecl = 0; 5688 TemplateParameterList *OldTemplateParams = 0; 5689 5690 if (TemplateParamLists.size() != 1) { 5691 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5692 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5693 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5694 } 5695 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5696 5697 // Only consider previous declarations in the same scope. 5698 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5699 /*ExplicitInstantiationOrSpecialization*/false); 5700 if (!Previous.empty()) { 5701 Redeclaration = true; 5702 5703 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5704 if (!OldDecl && !Invalid) { 5705 Diag(UsingLoc, diag::err_redefinition_different_kind) 5706 << Name.Identifier; 5707 5708 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5709 if (OldD->getLocation().isValid()) 5710 Diag(OldD->getLocation(), diag::note_previous_definition); 5711 5712 Invalid = true; 5713 } 5714 5715 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5716 if (TemplateParameterListsAreEqual(TemplateParams, 5717 OldDecl->getTemplateParameters(), 5718 /*Complain=*/true, 5719 TPL_TemplateMatch)) 5720 OldTemplateParams = OldDecl->getTemplateParameters(); 5721 else 5722 Invalid = true; 5723 5724 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5725 if (!Invalid && 5726 !Context.hasSameType(OldTD->getUnderlyingType(), 5727 NewTD->getUnderlyingType())) { 5728 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5729 // but we can't reasonably accept it. 5730 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5731 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5732 if (OldTD->getLocation().isValid()) 5733 Diag(OldTD->getLocation(), diag::note_previous_definition); 5734 Invalid = true; 5735 } 5736 } 5737 } 5738 5739 // Merge any previous default template arguments into our parameters, 5740 // and check the parameter list. 5741 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5742 TPC_TypeAliasTemplate)) 5743 return 0; 5744 5745 TypeAliasTemplateDecl *NewDecl = 5746 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5747 Name.Identifier, TemplateParams, 5748 NewTD); 5749 5750 NewDecl->setAccess(AS); 5751 5752 if (Invalid) 5753 NewDecl->setInvalidDecl(); 5754 else if (OldDecl) 5755 NewDecl->setPreviousDeclaration(OldDecl); 5756 5757 NewND = NewDecl; 5758 } else { 5759 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5760 NewND = NewTD; 5761 } 5762 5763 if (!Redeclaration) 5764 PushOnScopeChains(NewND, S); 5765 5766 return NewND; 5767} 5768 5769Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5770 SourceLocation NamespaceLoc, 5771 SourceLocation AliasLoc, 5772 IdentifierInfo *Alias, 5773 CXXScopeSpec &SS, 5774 SourceLocation IdentLoc, 5775 IdentifierInfo *Ident) { 5776 5777 // Lookup the namespace name. 5778 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5779 LookupParsedName(R, S, &SS); 5780 5781 // Check if we have a previous declaration with the same name. 5782 NamedDecl *PrevDecl 5783 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5784 ForRedeclaration); 5785 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5786 PrevDecl = 0; 5787 5788 if (PrevDecl) { 5789 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5790 // We already have an alias with the same name that points to the same 5791 // namespace, so don't create a new one. 5792 // FIXME: At some point, we'll want to create the (redundant) 5793 // declaration to maintain better source information. 5794 if (!R.isAmbiguous() && !R.empty() && 5795 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5796 return 0; 5797 } 5798 5799 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5800 diag::err_redefinition_different_kind; 5801 Diag(AliasLoc, DiagID) << Alias; 5802 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5803 return 0; 5804 } 5805 5806 if (R.isAmbiguous()) 5807 return 0; 5808 5809 if (R.empty()) { 5810 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5811 CTC_NoKeywords, 0)) { 5812 if (R.getAsSingle<NamespaceDecl>() || 5813 R.getAsSingle<NamespaceAliasDecl>()) { 5814 if (DeclContext *DC = computeDeclContext(SS, false)) 5815 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5816 << Ident << DC << Corrected << SS.getRange() 5817 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5818 else 5819 Diag(IdentLoc, diag::err_using_directive_suggest) 5820 << Ident << Corrected 5821 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5822 5823 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5824 << Corrected; 5825 5826 Ident = Corrected.getAsIdentifierInfo(); 5827 } else { 5828 R.clear(); 5829 R.setLookupName(Ident); 5830 } 5831 } 5832 5833 if (R.empty()) { 5834 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5835 return 0; 5836 } 5837 } 5838 5839 NamespaceAliasDecl *AliasDecl = 5840 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5841 Alias, SS.getWithLocInContext(Context), 5842 IdentLoc, R.getFoundDecl()); 5843 5844 PushOnScopeChains(AliasDecl, S); 5845 return AliasDecl; 5846} 5847 5848namespace { 5849 /// \brief Scoped object used to handle the state changes required in Sema 5850 /// to implicitly define the body of a C++ member function; 5851 class ImplicitlyDefinedFunctionScope { 5852 Sema &S; 5853 Sema::ContextRAII SavedContext; 5854 5855 public: 5856 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5857 : S(S), SavedContext(S, Method) 5858 { 5859 S.PushFunctionScope(); 5860 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5861 } 5862 5863 ~ImplicitlyDefinedFunctionScope() { 5864 S.PopExpressionEvaluationContext(); 5865 S.PopFunctionOrBlockScope(); 5866 } 5867 }; 5868} 5869 5870static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5871 CXXRecordDecl *D) { 5872 ASTContext &Context = Self.Context; 5873 QualType ClassType = Context.getTypeDeclType(D); 5874 DeclarationName ConstructorName 5875 = Context.DeclarationNames.getCXXConstructorName( 5876 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5877 5878 DeclContext::lookup_const_iterator Con, ConEnd; 5879 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5880 Con != ConEnd; ++Con) { 5881 // FIXME: In C++0x, a constructor template can be a default constructor. 5882 if (isa<FunctionTemplateDecl>(*Con)) 5883 continue; 5884 5885 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5886 if (Constructor->isDefaultConstructor()) 5887 return Constructor; 5888 } 5889 return 0; 5890} 5891 5892Sema::ImplicitExceptionSpecification 5893Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5894 // C++ [except.spec]p14: 5895 // An implicitly declared special member function (Clause 12) shall have an 5896 // exception-specification. [...] 5897 ImplicitExceptionSpecification ExceptSpec(Context); 5898 5899 // Direct base-class constructors. 5900 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5901 BEnd = ClassDecl->bases_end(); 5902 B != BEnd; ++B) { 5903 if (B->isVirtual()) // Handled below. 5904 continue; 5905 5906 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5907 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5908 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5909 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5910 else if (CXXConstructorDecl *Constructor 5911 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5912 ExceptSpec.CalledDecl(Constructor); 5913 } 5914 } 5915 5916 // Virtual base-class constructors. 5917 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5918 BEnd = ClassDecl->vbases_end(); 5919 B != BEnd; ++B) { 5920 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5921 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5922 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5923 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5924 else if (CXXConstructorDecl *Constructor 5925 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5926 ExceptSpec.CalledDecl(Constructor); 5927 } 5928 } 5929 5930 // Field constructors. 5931 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5932 FEnd = ClassDecl->field_end(); 5933 F != FEnd; ++F) { 5934 if (const RecordType *RecordTy 5935 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5936 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5937 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5938 ExceptSpec.CalledDecl( 5939 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5940 else if (CXXConstructorDecl *Constructor 5941 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5942 ExceptSpec.CalledDecl(Constructor); 5943 } 5944 } 5945 5946 return ExceptSpec; 5947} 5948 5949CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5950 CXXRecordDecl *ClassDecl) { 5951 // C++ [class.ctor]p5: 5952 // A default constructor for a class X is a constructor of class X 5953 // that can be called without an argument. If there is no 5954 // user-declared constructor for class X, a default constructor is 5955 // implicitly declared. An implicitly-declared default constructor 5956 // is an inline public member of its class. 5957 assert(!ClassDecl->hasUserDeclaredConstructor() && 5958 "Should not build implicit default constructor!"); 5959 5960 ImplicitExceptionSpecification Spec = 5961 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5962 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5963 5964 // Create the actual constructor declaration. 5965 CanQualType ClassType 5966 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5967 SourceLocation ClassLoc = ClassDecl->getLocation(); 5968 DeclarationName Name 5969 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5970 DeclarationNameInfo NameInfo(Name, ClassLoc); 5971 CXXConstructorDecl *DefaultCon 5972 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5973 Context.getFunctionType(Context.VoidTy, 5974 0, 0, EPI), 5975 /*TInfo=*/0, 5976 /*isExplicit=*/false, 5977 /*isInline=*/true, 5978 /*isImplicitlyDeclared=*/true); 5979 DefaultCon->setAccess(AS_public); 5980 DefaultCon->setDefaulted(); 5981 DefaultCon->setImplicit(); 5982 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5983 5984 // Note that we have declared this constructor. 5985 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5986 5987 // Do not delete this yet if we're in a template 5988 if (!ClassDecl->isDependentType() && 5989 ShouldDeleteDefaultConstructor(DefaultCon)) 5990 DefaultCon->setDeletedAsWritten(); 5991 5992 if (Scope *S = getScopeForContext(ClassDecl)) 5993 PushOnScopeChains(DefaultCon, S, false); 5994 ClassDecl->addDecl(DefaultCon); 5995 5996 return DefaultCon; 5997} 5998 5999void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6000 CXXConstructorDecl *Constructor) { 6001 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6002 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 6003 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6004 6005 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6006 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6007 6008 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6009 DiagnosticErrorTrap Trap(Diags); 6010 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6011 Trap.hasErrorOccurred()) { 6012 Diag(CurrentLocation, diag::note_member_synthesized_at) 6013 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6014 Constructor->setInvalidDecl(); 6015 return; 6016 } 6017 6018 SourceLocation Loc = Constructor->getLocation(); 6019 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6020 6021 Constructor->setUsed(); 6022 MarkVTableUsed(CurrentLocation, ClassDecl); 6023 6024 if (ASTMutationListener *L = getASTMutationListener()) { 6025 L->CompletedImplicitDefinition(Constructor); 6026 } 6027} 6028 6029void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6030 // We start with an initial pass over the base classes to collect those that 6031 // inherit constructors from. If there are none, we can forgo all further 6032 // processing. 6033 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6034 BasesVector BasesToInheritFrom; 6035 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6036 BaseE = ClassDecl->bases_end(); 6037 BaseIt != BaseE; ++BaseIt) { 6038 if (BaseIt->getInheritConstructors()) { 6039 QualType Base = BaseIt->getType(); 6040 if (Base->isDependentType()) { 6041 // If we inherit constructors from anything that is dependent, just 6042 // abort processing altogether. We'll get another chance for the 6043 // instantiations. 6044 return; 6045 } 6046 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6047 } 6048 } 6049 if (BasesToInheritFrom.empty()) 6050 return; 6051 6052 // Now collect the constructors that we already have in the current class. 6053 // Those take precedence over inherited constructors. 6054 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6055 // unless there is a user-declared constructor with the same signature in 6056 // the class where the using-declaration appears. 6057 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6058 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6059 CtorE = ClassDecl->ctor_end(); 6060 CtorIt != CtorE; ++CtorIt) { 6061 ExistingConstructors.insert( 6062 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6063 } 6064 6065 Scope *S = getScopeForContext(ClassDecl); 6066 DeclarationName CreatedCtorName = 6067 Context.DeclarationNames.getCXXConstructorName( 6068 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6069 6070 // Now comes the true work. 6071 // First, we keep a map from constructor types to the base that introduced 6072 // them. Needed for finding conflicting constructors. We also keep the 6073 // actually inserted declarations in there, for pretty diagnostics. 6074 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6075 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6076 ConstructorToSourceMap InheritedConstructors; 6077 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6078 BaseE = BasesToInheritFrom.end(); 6079 BaseIt != BaseE; ++BaseIt) { 6080 const RecordType *Base = *BaseIt; 6081 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6082 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6083 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6084 CtorE = BaseDecl->ctor_end(); 6085 CtorIt != CtorE; ++CtorIt) { 6086 // Find the using declaration for inheriting this base's constructors. 6087 DeclarationName Name = 6088 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6089 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6090 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6091 SourceLocation UsingLoc = UD ? UD->getLocation() : 6092 ClassDecl->getLocation(); 6093 6094 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6095 // from the class X named in the using-declaration consists of actual 6096 // constructors and notional constructors that result from the 6097 // transformation of defaulted parameters as follows: 6098 // - all non-template default constructors of X, and 6099 // - for each non-template constructor of X that has at least one 6100 // parameter with a default argument, the set of constructors that 6101 // results from omitting any ellipsis parameter specification and 6102 // successively omitting parameters with a default argument from the 6103 // end of the parameter-type-list. 6104 CXXConstructorDecl *BaseCtor = *CtorIt; 6105 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6106 const FunctionProtoType *BaseCtorType = 6107 BaseCtor->getType()->getAs<FunctionProtoType>(); 6108 6109 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6110 maxParams = BaseCtor->getNumParams(); 6111 params <= maxParams; ++params) { 6112 // Skip default constructors. They're never inherited. 6113 if (params == 0) 6114 continue; 6115 // Skip copy and move constructors for the same reason. 6116 if (CanBeCopyOrMove && params == 1) 6117 continue; 6118 6119 // Build up a function type for this particular constructor. 6120 // FIXME: The working paper does not consider that the exception spec 6121 // for the inheriting constructor might be larger than that of the 6122 // source. This code doesn't yet, either. 6123 const Type *NewCtorType; 6124 if (params == maxParams) 6125 NewCtorType = BaseCtorType; 6126 else { 6127 llvm::SmallVector<QualType, 16> Args; 6128 for (unsigned i = 0; i < params; ++i) { 6129 Args.push_back(BaseCtorType->getArgType(i)); 6130 } 6131 FunctionProtoType::ExtProtoInfo ExtInfo = 6132 BaseCtorType->getExtProtoInfo(); 6133 ExtInfo.Variadic = false; 6134 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6135 Args.data(), params, ExtInfo) 6136 .getTypePtr(); 6137 } 6138 const Type *CanonicalNewCtorType = 6139 Context.getCanonicalType(NewCtorType); 6140 6141 // Now that we have the type, first check if the class already has a 6142 // constructor with this signature. 6143 if (ExistingConstructors.count(CanonicalNewCtorType)) 6144 continue; 6145 6146 // Then we check if we have already declared an inherited constructor 6147 // with this signature. 6148 std::pair<ConstructorToSourceMap::iterator, bool> result = 6149 InheritedConstructors.insert(std::make_pair( 6150 CanonicalNewCtorType, 6151 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6152 if (!result.second) { 6153 // Already in the map. If it came from a different class, that's an 6154 // error. Not if it's from the same. 6155 CanQualType PreviousBase = result.first->second.first; 6156 if (CanonicalBase != PreviousBase) { 6157 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6158 const CXXConstructorDecl *PrevBaseCtor = 6159 PrevCtor->getInheritedConstructor(); 6160 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6161 6162 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6163 Diag(BaseCtor->getLocation(), 6164 diag::note_using_decl_constructor_conflict_current_ctor); 6165 Diag(PrevBaseCtor->getLocation(), 6166 diag::note_using_decl_constructor_conflict_previous_ctor); 6167 Diag(PrevCtor->getLocation(), 6168 diag::note_using_decl_constructor_conflict_previous_using); 6169 } 6170 continue; 6171 } 6172 6173 // OK, we're there, now add the constructor. 6174 // C++0x [class.inhctor]p8: [...] that would be performed by a 6175 // user-writtern inline constructor [...] 6176 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6177 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6178 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6179 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6180 /*ImplicitlyDeclared=*/true); 6181 NewCtor->setAccess(BaseCtor->getAccess()); 6182 6183 // Build up the parameter decls and add them. 6184 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6185 for (unsigned i = 0; i < params; ++i) { 6186 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6187 UsingLoc, UsingLoc, 6188 /*IdentifierInfo=*/0, 6189 BaseCtorType->getArgType(i), 6190 /*TInfo=*/0, SC_None, 6191 SC_None, /*DefaultArg=*/0)); 6192 } 6193 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6194 NewCtor->setInheritedConstructor(BaseCtor); 6195 6196 PushOnScopeChains(NewCtor, S, false); 6197 ClassDecl->addDecl(NewCtor); 6198 result.first->second.second = NewCtor; 6199 } 6200 } 6201 } 6202} 6203 6204Sema::ImplicitExceptionSpecification 6205Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6206 // C++ [except.spec]p14: 6207 // An implicitly declared special member function (Clause 12) shall have 6208 // an exception-specification. 6209 ImplicitExceptionSpecification ExceptSpec(Context); 6210 6211 // Direct base-class destructors. 6212 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6213 BEnd = ClassDecl->bases_end(); 6214 B != BEnd; ++B) { 6215 if (B->isVirtual()) // Handled below. 6216 continue; 6217 6218 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6219 ExceptSpec.CalledDecl( 6220 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6221 } 6222 6223 // Virtual base-class destructors. 6224 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6225 BEnd = ClassDecl->vbases_end(); 6226 B != BEnd; ++B) { 6227 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6228 ExceptSpec.CalledDecl( 6229 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6230 } 6231 6232 // Field destructors. 6233 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6234 FEnd = ClassDecl->field_end(); 6235 F != FEnd; ++F) { 6236 if (const RecordType *RecordTy 6237 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6238 ExceptSpec.CalledDecl( 6239 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6240 } 6241 6242 return ExceptSpec; 6243} 6244 6245CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6246 // C++ [class.dtor]p2: 6247 // If a class has no user-declared destructor, a destructor is 6248 // declared implicitly. An implicitly-declared destructor is an 6249 // inline public member of its class. 6250 6251 ImplicitExceptionSpecification Spec = 6252 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6253 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6254 6255 // Create the actual destructor declaration. 6256 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6257 6258 CanQualType ClassType 6259 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6260 SourceLocation ClassLoc = ClassDecl->getLocation(); 6261 DeclarationName Name 6262 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6263 DeclarationNameInfo NameInfo(Name, ClassLoc); 6264 CXXDestructorDecl *Destructor 6265 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6266 /*isInline=*/true, 6267 /*isImplicitlyDeclared=*/true); 6268 Destructor->setAccess(AS_public); 6269 Destructor->setDefaulted(); 6270 Destructor->setImplicit(); 6271 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6272 6273 // Note that we have declared this destructor. 6274 ++ASTContext::NumImplicitDestructorsDeclared; 6275 6276 // Introduce this destructor into its scope. 6277 if (Scope *S = getScopeForContext(ClassDecl)) 6278 PushOnScopeChains(Destructor, S, false); 6279 ClassDecl->addDecl(Destructor); 6280 6281 // This could be uniqued if it ever proves significant. 6282 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6283 6284 if (ShouldDeleteDestructor(Destructor)) 6285 Destructor->setDeletedAsWritten(); 6286 6287 AddOverriddenMethods(ClassDecl, Destructor); 6288 6289 return Destructor; 6290} 6291 6292void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6293 CXXDestructorDecl *Destructor) { 6294 assert((Destructor->isDefaulted() && !Destructor->isUsed(false)) && 6295 "DefineImplicitDestructor - call it for implicit default dtor"); 6296 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6297 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6298 6299 if (Destructor->isInvalidDecl()) 6300 return; 6301 6302 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6303 6304 DiagnosticErrorTrap Trap(Diags); 6305 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6306 Destructor->getParent()); 6307 6308 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6309 Diag(CurrentLocation, diag::note_member_synthesized_at) 6310 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6311 6312 Destructor->setInvalidDecl(); 6313 return; 6314 } 6315 6316 SourceLocation Loc = Destructor->getLocation(); 6317 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6318 6319 Destructor->setUsed(); 6320 MarkVTableUsed(CurrentLocation, ClassDecl); 6321 6322 if (ASTMutationListener *L = getASTMutationListener()) { 6323 L->CompletedImplicitDefinition(Destructor); 6324 } 6325} 6326 6327/// \brief Builds a statement that copies the given entity from \p From to 6328/// \c To. 6329/// 6330/// This routine is used to copy the members of a class with an 6331/// implicitly-declared copy assignment operator. When the entities being 6332/// copied are arrays, this routine builds for loops to copy them. 6333/// 6334/// \param S The Sema object used for type-checking. 6335/// 6336/// \param Loc The location where the implicit copy is being generated. 6337/// 6338/// \param T The type of the expressions being copied. Both expressions must 6339/// have this type. 6340/// 6341/// \param To The expression we are copying to. 6342/// 6343/// \param From The expression we are copying from. 6344/// 6345/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6346/// Otherwise, it's a non-static member subobject. 6347/// 6348/// \param Depth Internal parameter recording the depth of the recursion. 6349/// 6350/// \returns A statement or a loop that copies the expressions. 6351static StmtResult 6352BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6353 Expr *To, Expr *From, 6354 bool CopyingBaseSubobject, unsigned Depth = 0) { 6355 // C++0x [class.copy]p30: 6356 // Each subobject is assigned in the manner appropriate to its type: 6357 // 6358 // - if the subobject is of class type, the copy assignment operator 6359 // for the class is used (as if by explicit qualification; that is, 6360 // ignoring any possible virtual overriding functions in more derived 6361 // classes); 6362 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6363 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6364 6365 // Look for operator=. 6366 DeclarationName Name 6367 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6368 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6369 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6370 6371 // Filter out any result that isn't a copy-assignment operator. 6372 LookupResult::Filter F = OpLookup.makeFilter(); 6373 while (F.hasNext()) { 6374 NamedDecl *D = F.next(); 6375 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6376 if (Method->isCopyAssignmentOperator()) 6377 continue; 6378 6379 F.erase(); 6380 } 6381 F.done(); 6382 6383 // Suppress the protected check (C++ [class.protected]) for each of the 6384 // assignment operators we found. This strange dance is required when 6385 // we're assigning via a base classes's copy-assignment operator. To 6386 // ensure that we're getting the right base class subobject (without 6387 // ambiguities), we need to cast "this" to that subobject type; to 6388 // ensure that we don't go through the virtual call mechanism, we need 6389 // to qualify the operator= name with the base class (see below). However, 6390 // this means that if the base class has a protected copy assignment 6391 // operator, the protected member access check will fail. So, we 6392 // rewrite "protected" access to "public" access in this case, since we 6393 // know by construction that we're calling from a derived class. 6394 if (CopyingBaseSubobject) { 6395 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6396 L != LEnd; ++L) { 6397 if (L.getAccess() == AS_protected) 6398 L.setAccess(AS_public); 6399 } 6400 } 6401 6402 // Create the nested-name-specifier that will be used to qualify the 6403 // reference to operator=; this is required to suppress the virtual 6404 // call mechanism. 6405 CXXScopeSpec SS; 6406 SS.MakeTrivial(S.Context, 6407 NestedNameSpecifier::Create(S.Context, 0, false, 6408 T.getTypePtr()), 6409 Loc); 6410 6411 // Create the reference to operator=. 6412 ExprResult OpEqualRef 6413 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6414 /*FirstQualifierInScope=*/0, OpLookup, 6415 /*TemplateArgs=*/0, 6416 /*SuppressQualifierCheck=*/true); 6417 if (OpEqualRef.isInvalid()) 6418 return StmtError(); 6419 6420 // Build the call to the assignment operator. 6421 6422 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6423 OpEqualRef.takeAs<Expr>(), 6424 Loc, &From, 1, Loc); 6425 if (Call.isInvalid()) 6426 return StmtError(); 6427 6428 return S.Owned(Call.takeAs<Stmt>()); 6429 } 6430 6431 // - if the subobject is of scalar type, the built-in assignment 6432 // operator is used. 6433 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6434 if (!ArrayTy) { 6435 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6436 if (Assignment.isInvalid()) 6437 return StmtError(); 6438 6439 return S.Owned(Assignment.takeAs<Stmt>()); 6440 } 6441 6442 // - if the subobject is an array, each element is assigned, in the 6443 // manner appropriate to the element type; 6444 6445 // Construct a loop over the array bounds, e.g., 6446 // 6447 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6448 // 6449 // that will copy each of the array elements. 6450 QualType SizeType = S.Context.getSizeType(); 6451 6452 // Create the iteration variable. 6453 IdentifierInfo *IterationVarName = 0; 6454 { 6455 llvm::SmallString<8> Str; 6456 llvm::raw_svector_ostream OS(Str); 6457 OS << "__i" << Depth; 6458 IterationVarName = &S.Context.Idents.get(OS.str()); 6459 } 6460 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6461 IterationVarName, SizeType, 6462 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6463 SC_None, SC_None); 6464 6465 // Initialize the iteration variable to zero. 6466 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6467 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6468 6469 // Create a reference to the iteration variable; we'll use this several 6470 // times throughout. 6471 Expr *IterationVarRef 6472 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6473 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6474 6475 // Create the DeclStmt that holds the iteration variable. 6476 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6477 6478 // Create the comparison against the array bound. 6479 llvm::APInt Upper 6480 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6481 Expr *Comparison 6482 = new (S.Context) BinaryOperator(IterationVarRef, 6483 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6484 BO_NE, S.Context.BoolTy, 6485 VK_RValue, OK_Ordinary, Loc); 6486 6487 // Create the pre-increment of the iteration variable. 6488 Expr *Increment 6489 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6490 VK_LValue, OK_Ordinary, Loc); 6491 6492 // Subscript the "from" and "to" expressions with the iteration variable. 6493 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6494 IterationVarRef, Loc)); 6495 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6496 IterationVarRef, Loc)); 6497 6498 // Build the copy for an individual element of the array. 6499 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6500 To, From, CopyingBaseSubobject, 6501 Depth + 1); 6502 if (Copy.isInvalid()) 6503 return StmtError(); 6504 6505 // Construct the loop that copies all elements of this array. 6506 return S.ActOnForStmt(Loc, Loc, InitStmt, 6507 S.MakeFullExpr(Comparison), 6508 0, S.MakeFullExpr(Increment), 6509 Loc, Copy.take()); 6510} 6511 6512/// \brief Determine whether the given class has a copy assignment operator 6513/// that accepts a const-qualified argument. 6514static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6515 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6516 6517 if (!Class->hasDeclaredCopyAssignment()) 6518 S.DeclareImplicitCopyAssignment(Class); 6519 6520 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6521 DeclarationName OpName 6522 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6523 6524 DeclContext::lookup_const_iterator Op, OpEnd; 6525 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6526 // C++ [class.copy]p9: 6527 // A user-declared copy assignment operator is a non-static non-template 6528 // member function of class X with exactly one parameter of type X, X&, 6529 // const X&, volatile X& or const volatile X&. 6530 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6531 if (!Method) 6532 continue; 6533 6534 if (Method->isStatic()) 6535 continue; 6536 if (Method->getPrimaryTemplate()) 6537 continue; 6538 const FunctionProtoType *FnType = 6539 Method->getType()->getAs<FunctionProtoType>(); 6540 assert(FnType && "Overloaded operator has no prototype."); 6541 // Don't assert on this; an invalid decl might have been left in the AST. 6542 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6543 continue; 6544 bool AcceptsConst = true; 6545 QualType ArgType = FnType->getArgType(0); 6546 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6547 ArgType = Ref->getPointeeType(); 6548 // Is it a non-const lvalue reference? 6549 if (!ArgType.isConstQualified()) 6550 AcceptsConst = false; 6551 } 6552 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6553 continue; 6554 6555 // We have a single argument of type cv X or cv X&, i.e. we've found the 6556 // copy assignment operator. Return whether it accepts const arguments. 6557 return AcceptsConst; 6558 } 6559 assert(Class->isInvalidDecl() && 6560 "No copy assignment operator declared in valid code."); 6561 return false; 6562} 6563 6564std::pair<Sema::ImplicitExceptionSpecification, bool> 6565Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6566 CXXRecordDecl *ClassDecl) { 6567 // C++ [class.copy]p10: 6568 // If the class definition does not explicitly declare a copy 6569 // assignment operator, one is declared implicitly. 6570 // The implicitly-defined copy assignment operator for a class X 6571 // will have the form 6572 // 6573 // X& X::operator=(const X&) 6574 // 6575 // if 6576 bool HasConstCopyAssignment = true; 6577 6578 // -- each direct base class B of X has a copy assignment operator 6579 // whose parameter is of type const B&, const volatile B& or B, 6580 // and 6581 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6582 BaseEnd = ClassDecl->bases_end(); 6583 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6584 assert(!Base->getType()->isDependentType() && 6585 "Cannot generate implicit members for class with dependent bases."); 6586 const CXXRecordDecl *BaseClassDecl 6587 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6588 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6589 } 6590 6591 // -- for all the nonstatic data members of X that are of a class 6592 // type M (or array thereof), each such class type has a copy 6593 // assignment operator whose parameter is of type const M&, 6594 // const volatile M& or M. 6595 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6596 FieldEnd = ClassDecl->field_end(); 6597 HasConstCopyAssignment && Field != FieldEnd; 6598 ++Field) { 6599 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6600 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6601 const CXXRecordDecl *FieldClassDecl 6602 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6603 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6604 } 6605 } 6606 6607 // Otherwise, the implicitly declared copy assignment operator will 6608 // have the form 6609 // 6610 // X& X::operator=(X&) 6611 6612 // C++ [except.spec]p14: 6613 // An implicitly declared special member function (Clause 12) shall have an 6614 // exception-specification. [...] 6615 ImplicitExceptionSpecification ExceptSpec(Context); 6616 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6617 BaseEnd = ClassDecl->bases_end(); 6618 Base != BaseEnd; ++Base) { 6619 CXXRecordDecl *BaseClassDecl 6620 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6621 6622 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6623 DeclareImplicitCopyAssignment(BaseClassDecl); 6624 6625 if (CXXMethodDecl *CopyAssign 6626 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6627 ExceptSpec.CalledDecl(CopyAssign); 6628 } 6629 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6630 FieldEnd = ClassDecl->field_end(); 6631 Field != FieldEnd; 6632 ++Field) { 6633 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6634 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6635 CXXRecordDecl *FieldClassDecl 6636 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6637 6638 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6639 DeclareImplicitCopyAssignment(FieldClassDecl); 6640 6641 if (CXXMethodDecl *CopyAssign 6642 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6643 ExceptSpec.CalledDecl(CopyAssign); 6644 } 6645 } 6646 6647 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6648} 6649 6650CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6651 // Note: The following rules are largely analoguous to the copy 6652 // constructor rules. Note that virtual bases are not taken into account 6653 // for determining the argument type of the operator. Note also that 6654 // operators taking an object instead of a reference are allowed. 6655 6656 ImplicitExceptionSpecification Spec(Context); 6657 bool Const; 6658 llvm::tie(Spec, Const) = 6659 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6660 6661 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6662 QualType RetType = Context.getLValueReferenceType(ArgType); 6663 if (Const) 6664 ArgType = ArgType.withConst(); 6665 ArgType = Context.getLValueReferenceType(ArgType); 6666 6667 // An implicitly-declared copy assignment operator is an inline public 6668 // member of its class. 6669 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6670 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6671 SourceLocation ClassLoc = ClassDecl->getLocation(); 6672 DeclarationNameInfo NameInfo(Name, ClassLoc); 6673 CXXMethodDecl *CopyAssignment 6674 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6675 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6676 /*TInfo=*/0, /*isStatic=*/false, 6677 /*StorageClassAsWritten=*/SC_None, 6678 /*isInline=*/true, 6679 SourceLocation()); 6680 CopyAssignment->setAccess(AS_public); 6681 CopyAssignment->setDefaulted(); 6682 CopyAssignment->setImplicit(); 6683 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6684 6685 // Add the parameter to the operator. 6686 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6687 ClassLoc, ClassLoc, /*Id=*/0, 6688 ArgType, /*TInfo=*/0, 6689 SC_None, 6690 SC_None, 0); 6691 CopyAssignment->setParams(&FromParam, 1); 6692 6693 // Note that we have added this copy-assignment operator. 6694 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6695 6696 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6697 CopyAssignment->setDeletedAsWritten(); 6698 6699 if (Scope *S = getScopeForContext(ClassDecl)) 6700 PushOnScopeChains(CopyAssignment, S, false); 6701 ClassDecl->addDecl(CopyAssignment); 6702 6703 AddOverriddenMethods(ClassDecl, CopyAssignment); 6704 return CopyAssignment; 6705} 6706 6707void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6708 CXXMethodDecl *CopyAssignOperator) { 6709 assert((CopyAssignOperator->isDefaulted() && 6710 CopyAssignOperator->isOverloadedOperator() && 6711 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6712 !CopyAssignOperator->isUsed(false)) && 6713 "DefineImplicitCopyAssignment called for wrong function"); 6714 6715 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6716 6717 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6718 CopyAssignOperator->setInvalidDecl(); 6719 return; 6720 } 6721 6722 CopyAssignOperator->setUsed(); 6723 6724 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6725 DiagnosticErrorTrap Trap(Diags); 6726 6727 // C++0x [class.copy]p30: 6728 // The implicitly-defined or explicitly-defaulted copy assignment operator 6729 // for a non-union class X performs memberwise copy assignment of its 6730 // subobjects. The direct base classes of X are assigned first, in the 6731 // order of their declaration in the base-specifier-list, and then the 6732 // immediate non-static data members of X are assigned, in the order in 6733 // which they were declared in the class definition. 6734 6735 // The statements that form the synthesized function body. 6736 ASTOwningVector<Stmt*> Statements(*this); 6737 6738 // The parameter for the "other" object, which we are copying from. 6739 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6740 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6741 QualType OtherRefType = Other->getType(); 6742 if (const LValueReferenceType *OtherRef 6743 = OtherRefType->getAs<LValueReferenceType>()) { 6744 OtherRefType = OtherRef->getPointeeType(); 6745 OtherQuals = OtherRefType.getQualifiers(); 6746 } 6747 6748 // Our location for everything implicitly-generated. 6749 SourceLocation Loc = CopyAssignOperator->getLocation(); 6750 6751 // Construct a reference to the "other" object. We'll be using this 6752 // throughout the generated ASTs. 6753 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6754 assert(OtherRef && "Reference to parameter cannot fail!"); 6755 6756 // Construct the "this" pointer. We'll be using this throughout the generated 6757 // ASTs. 6758 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6759 assert(This && "Reference to this cannot fail!"); 6760 6761 // Assign base classes. 6762 bool Invalid = false; 6763 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6764 E = ClassDecl->bases_end(); Base != E; ++Base) { 6765 // Form the assignment: 6766 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6767 QualType BaseType = Base->getType().getUnqualifiedType(); 6768 if (!BaseType->isRecordType()) { 6769 Invalid = true; 6770 continue; 6771 } 6772 6773 CXXCastPath BasePath; 6774 BasePath.push_back(Base); 6775 6776 // Construct the "from" expression, which is an implicit cast to the 6777 // appropriately-qualified base type. 6778 Expr *From = OtherRef; 6779 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6780 CK_UncheckedDerivedToBase, 6781 VK_LValue, &BasePath).take(); 6782 6783 // Dereference "this". 6784 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6785 6786 // Implicitly cast "this" to the appropriately-qualified base type. 6787 To = ImpCastExprToType(To.take(), 6788 Context.getCVRQualifiedType(BaseType, 6789 CopyAssignOperator->getTypeQualifiers()), 6790 CK_UncheckedDerivedToBase, 6791 VK_LValue, &BasePath); 6792 6793 // Build the copy. 6794 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6795 To.get(), From, 6796 /*CopyingBaseSubobject=*/true); 6797 if (Copy.isInvalid()) { 6798 Diag(CurrentLocation, diag::note_member_synthesized_at) 6799 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6800 CopyAssignOperator->setInvalidDecl(); 6801 return; 6802 } 6803 6804 // Success! Record the copy. 6805 Statements.push_back(Copy.takeAs<Expr>()); 6806 } 6807 6808 // \brief Reference to the __builtin_memcpy function. 6809 Expr *BuiltinMemCpyRef = 0; 6810 // \brief Reference to the __builtin_objc_memmove_collectable function. 6811 Expr *CollectableMemCpyRef = 0; 6812 6813 // Assign non-static members. 6814 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6815 FieldEnd = ClassDecl->field_end(); 6816 Field != FieldEnd; ++Field) { 6817 // Check for members of reference type; we can't copy those. 6818 if (Field->getType()->isReferenceType()) { 6819 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6820 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6821 Diag(Field->getLocation(), diag::note_declared_at); 6822 Diag(CurrentLocation, diag::note_member_synthesized_at) 6823 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6824 Invalid = true; 6825 continue; 6826 } 6827 6828 // Check for members of const-qualified, non-class type. 6829 QualType BaseType = Context.getBaseElementType(Field->getType()); 6830 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6831 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6832 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6833 Diag(Field->getLocation(), diag::note_declared_at); 6834 Diag(CurrentLocation, diag::note_member_synthesized_at) 6835 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6836 Invalid = true; 6837 continue; 6838 } 6839 6840 QualType FieldType = Field->getType().getNonReferenceType(); 6841 if (FieldType->isIncompleteArrayType()) { 6842 assert(ClassDecl->hasFlexibleArrayMember() && 6843 "Incomplete array type is not valid"); 6844 continue; 6845 } 6846 6847 // Build references to the field in the object we're copying from and to. 6848 CXXScopeSpec SS; // Intentionally empty 6849 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6850 LookupMemberName); 6851 MemberLookup.addDecl(*Field); 6852 MemberLookup.resolveKind(); 6853 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6854 Loc, /*IsArrow=*/false, 6855 SS, 0, MemberLookup, 0); 6856 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6857 Loc, /*IsArrow=*/true, 6858 SS, 0, MemberLookup, 0); 6859 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6860 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6861 6862 // If the field should be copied with __builtin_memcpy rather than via 6863 // explicit assignments, do so. This optimization only applies for arrays 6864 // of scalars and arrays of class type with trivial copy-assignment 6865 // operators. 6866 if (FieldType->isArrayType() && 6867 (!BaseType->isRecordType() || 6868 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6869 ->hasTrivialCopyAssignment())) { 6870 // Compute the size of the memory buffer to be copied. 6871 QualType SizeType = Context.getSizeType(); 6872 llvm::APInt Size(Context.getTypeSize(SizeType), 6873 Context.getTypeSizeInChars(BaseType).getQuantity()); 6874 for (const ConstantArrayType *Array 6875 = Context.getAsConstantArrayType(FieldType); 6876 Array; 6877 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6878 llvm::APInt ArraySize 6879 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6880 Size *= ArraySize; 6881 } 6882 6883 // Take the address of the field references for "from" and "to". 6884 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6885 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6886 6887 bool NeedsCollectableMemCpy = 6888 (BaseType->isRecordType() && 6889 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6890 6891 if (NeedsCollectableMemCpy) { 6892 if (!CollectableMemCpyRef) { 6893 // Create a reference to the __builtin_objc_memmove_collectable function. 6894 LookupResult R(*this, 6895 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6896 Loc, LookupOrdinaryName); 6897 LookupName(R, TUScope, true); 6898 6899 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6900 if (!CollectableMemCpy) { 6901 // Something went horribly wrong earlier, and we will have 6902 // complained about it. 6903 Invalid = true; 6904 continue; 6905 } 6906 6907 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6908 CollectableMemCpy->getType(), 6909 VK_LValue, Loc, 0).take(); 6910 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6911 } 6912 } 6913 // Create a reference to the __builtin_memcpy builtin function. 6914 else if (!BuiltinMemCpyRef) { 6915 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6916 LookupOrdinaryName); 6917 LookupName(R, TUScope, true); 6918 6919 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6920 if (!BuiltinMemCpy) { 6921 // Something went horribly wrong earlier, and we will have complained 6922 // about it. 6923 Invalid = true; 6924 continue; 6925 } 6926 6927 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6928 BuiltinMemCpy->getType(), 6929 VK_LValue, Loc, 0).take(); 6930 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6931 } 6932 6933 ASTOwningVector<Expr*> CallArgs(*this); 6934 CallArgs.push_back(To.takeAs<Expr>()); 6935 CallArgs.push_back(From.takeAs<Expr>()); 6936 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6937 ExprResult Call = ExprError(); 6938 if (NeedsCollectableMemCpy) 6939 Call = ActOnCallExpr(/*Scope=*/0, 6940 CollectableMemCpyRef, 6941 Loc, move_arg(CallArgs), 6942 Loc); 6943 else 6944 Call = ActOnCallExpr(/*Scope=*/0, 6945 BuiltinMemCpyRef, 6946 Loc, move_arg(CallArgs), 6947 Loc); 6948 6949 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6950 Statements.push_back(Call.takeAs<Expr>()); 6951 continue; 6952 } 6953 6954 // Build the copy of this field. 6955 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6956 To.get(), From.get(), 6957 /*CopyingBaseSubobject=*/false); 6958 if (Copy.isInvalid()) { 6959 Diag(CurrentLocation, diag::note_member_synthesized_at) 6960 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6961 CopyAssignOperator->setInvalidDecl(); 6962 return; 6963 } 6964 6965 // Success! Record the copy. 6966 Statements.push_back(Copy.takeAs<Stmt>()); 6967 } 6968 6969 if (!Invalid) { 6970 // Add a "return *this;" 6971 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6972 6973 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6974 if (Return.isInvalid()) 6975 Invalid = true; 6976 else { 6977 Statements.push_back(Return.takeAs<Stmt>()); 6978 6979 if (Trap.hasErrorOccurred()) { 6980 Diag(CurrentLocation, diag::note_member_synthesized_at) 6981 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6982 Invalid = true; 6983 } 6984 } 6985 } 6986 6987 if (Invalid) { 6988 CopyAssignOperator->setInvalidDecl(); 6989 return; 6990 } 6991 6992 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6993 /*isStmtExpr=*/false); 6994 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6995 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6996 6997 if (ASTMutationListener *L = getASTMutationListener()) { 6998 L->CompletedImplicitDefinition(CopyAssignOperator); 6999 } 7000} 7001 7002std::pair<Sema::ImplicitExceptionSpecification, bool> 7003Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7004 // C++ [class.copy]p5: 7005 // The implicitly-declared copy constructor for a class X will 7006 // have the form 7007 // 7008 // X::X(const X&) 7009 // 7010 // if 7011 bool HasConstCopyConstructor = true; 7012 7013 // -- each direct or virtual base class B of X has a copy 7014 // constructor whose first parameter is of type const B& or 7015 // const volatile B&, and 7016 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7017 BaseEnd = ClassDecl->bases_end(); 7018 HasConstCopyConstructor && Base != BaseEnd; 7019 ++Base) { 7020 // Virtual bases are handled below. 7021 if (Base->isVirtual()) 7022 continue; 7023 7024 CXXRecordDecl *BaseClassDecl 7025 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7026 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7027 DeclareImplicitCopyConstructor(BaseClassDecl); 7028 7029 HasConstCopyConstructor 7030 = BaseClassDecl->hasConstCopyConstructor(Context); 7031 } 7032 7033 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7034 BaseEnd = ClassDecl->vbases_end(); 7035 HasConstCopyConstructor && Base != BaseEnd; 7036 ++Base) { 7037 CXXRecordDecl *BaseClassDecl 7038 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7039 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7040 DeclareImplicitCopyConstructor(BaseClassDecl); 7041 7042 HasConstCopyConstructor 7043 = BaseClassDecl->hasConstCopyConstructor(Context); 7044 } 7045 7046 // -- for all the nonstatic data members of X that are of a 7047 // class type M (or array thereof), each such class type 7048 // has a copy constructor whose first parameter is of type 7049 // const M& or const volatile M&. 7050 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7051 FieldEnd = ClassDecl->field_end(); 7052 HasConstCopyConstructor && Field != FieldEnd; 7053 ++Field) { 7054 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7055 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7056 CXXRecordDecl *FieldClassDecl 7057 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7058 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7059 DeclareImplicitCopyConstructor(FieldClassDecl); 7060 7061 HasConstCopyConstructor 7062 = FieldClassDecl->hasConstCopyConstructor(Context); 7063 } 7064 } 7065 // Otherwise, the implicitly declared copy constructor will have 7066 // the form 7067 // 7068 // X::X(X&) 7069 7070 // C++ [except.spec]p14: 7071 // An implicitly declared special member function (Clause 12) shall have an 7072 // exception-specification. [...] 7073 ImplicitExceptionSpecification ExceptSpec(Context); 7074 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7075 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7076 BaseEnd = ClassDecl->bases_end(); 7077 Base != BaseEnd; 7078 ++Base) { 7079 // Virtual bases are handled below. 7080 if (Base->isVirtual()) 7081 continue; 7082 7083 CXXRecordDecl *BaseClassDecl 7084 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7085 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7086 DeclareImplicitCopyConstructor(BaseClassDecl); 7087 7088 if (CXXConstructorDecl *CopyConstructor 7089 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7090 ExceptSpec.CalledDecl(CopyConstructor); 7091 } 7092 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7093 BaseEnd = ClassDecl->vbases_end(); 7094 Base != BaseEnd; 7095 ++Base) { 7096 CXXRecordDecl *BaseClassDecl 7097 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7098 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7099 DeclareImplicitCopyConstructor(BaseClassDecl); 7100 7101 if (CXXConstructorDecl *CopyConstructor 7102 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7103 ExceptSpec.CalledDecl(CopyConstructor); 7104 } 7105 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7106 FieldEnd = ClassDecl->field_end(); 7107 Field != FieldEnd; 7108 ++Field) { 7109 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7110 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7111 CXXRecordDecl *FieldClassDecl 7112 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7113 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7114 DeclareImplicitCopyConstructor(FieldClassDecl); 7115 7116 if (CXXConstructorDecl *CopyConstructor 7117 = FieldClassDecl->getCopyConstructor(Context, Quals)) 7118 ExceptSpec.CalledDecl(CopyConstructor); 7119 } 7120 } 7121 7122 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7123} 7124 7125CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7126 CXXRecordDecl *ClassDecl) { 7127 // C++ [class.copy]p4: 7128 // If the class definition does not explicitly declare a copy 7129 // constructor, one is declared implicitly. 7130 7131 ImplicitExceptionSpecification Spec(Context); 7132 bool Const; 7133 llvm::tie(Spec, Const) = 7134 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7135 7136 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7137 QualType ArgType = ClassType; 7138 if (Const) 7139 ArgType = ArgType.withConst(); 7140 ArgType = Context.getLValueReferenceType(ArgType); 7141 7142 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7143 7144 DeclarationName Name 7145 = Context.DeclarationNames.getCXXConstructorName( 7146 Context.getCanonicalType(ClassType)); 7147 SourceLocation ClassLoc = ClassDecl->getLocation(); 7148 DeclarationNameInfo NameInfo(Name, ClassLoc); 7149 7150 // An implicitly-declared copy constructor is an inline public 7151 // member of its class. 7152 CXXConstructorDecl *CopyConstructor 7153 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7154 Context.getFunctionType(Context.VoidTy, 7155 &ArgType, 1, EPI), 7156 /*TInfo=*/0, 7157 /*isExplicit=*/false, 7158 /*isInline=*/true, 7159 /*isImplicitlyDeclared=*/true); 7160 CopyConstructor->setAccess(AS_public); 7161 CopyConstructor->setDefaulted(); 7162 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7163 7164 // Note that we have declared this constructor. 7165 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7166 7167 // Add the parameter to the constructor. 7168 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7169 ClassLoc, ClassLoc, 7170 /*IdentifierInfo=*/0, 7171 ArgType, /*TInfo=*/0, 7172 SC_None, 7173 SC_None, 0); 7174 CopyConstructor->setParams(&FromParam, 1); 7175 7176 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7177 CopyConstructor->setDeletedAsWritten(); 7178 7179 if (Scope *S = getScopeForContext(ClassDecl)) 7180 PushOnScopeChains(CopyConstructor, S, false); 7181 ClassDecl->addDecl(CopyConstructor); 7182 7183 return CopyConstructor; 7184} 7185 7186void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7187 CXXConstructorDecl *CopyConstructor) { 7188 assert((CopyConstructor->isDefaulted() && 7189 CopyConstructor->isCopyConstructor() && 7190 !CopyConstructor->isUsed(false)) && 7191 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7192 7193 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7194 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7195 7196 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7197 DiagnosticErrorTrap Trap(Diags); 7198 7199 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7200 Trap.hasErrorOccurred()) { 7201 Diag(CurrentLocation, diag::note_member_synthesized_at) 7202 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7203 CopyConstructor->setInvalidDecl(); 7204 } else { 7205 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7206 CopyConstructor->getLocation(), 7207 MultiStmtArg(*this, 0, 0), 7208 /*isStmtExpr=*/false) 7209 .takeAs<Stmt>()); 7210 } 7211 7212 CopyConstructor->setUsed(); 7213 7214 if (ASTMutationListener *L = getASTMutationListener()) { 7215 L->CompletedImplicitDefinition(CopyConstructor); 7216 } 7217} 7218 7219ExprResult 7220Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7221 CXXConstructorDecl *Constructor, 7222 MultiExprArg ExprArgs, 7223 bool RequiresZeroInit, 7224 unsigned ConstructKind, 7225 SourceRange ParenRange) { 7226 bool Elidable = false; 7227 7228 // C++0x [class.copy]p34: 7229 // When certain criteria are met, an implementation is allowed to 7230 // omit the copy/move construction of a class object, even if the 7231 // copy/move constructor and/or destructor for the object have 7232 // side effects. [...] 7233 // - when a temporary class object that has not been bound to a 7234 // reference (12.2) would be copied/moved to a class object 7235 // with the same cv-unqualified type, the copy/move operation 7236 // can be omitted by constructing the temporary object 7237 // directly into the target of the omitted copy/move 7238 if (ConstructKind == CXXConstructExpr::CK_Complete && 7239 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7240 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7241 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7242 } 7243 7244 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7245 Elidable, move(ExprArgs), RequiresZeroInit, 7246 ConstructKind, ParenRange); 7247} 7248 7249/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7250/// including handling of its default argument expressions. 7251ExprResult 7252Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7253 CXXConstructorDecl *Constructor, bool Elidable, 7254 MultiExprArg ExprArgs, 7255 bool RequiresZeroInit, 7256 unsigned ConstructKind, 7257 SourceRange ParenRange) { 7258 unsigned NumExprs = ExprArgs.size(); 7259 Expr **Exprs = (Expr **)ExprArgs.release(); 7260 7261 for (specific_attr_iterator<NonNullAttr> 7262 i = Constructor->specific_attr_begin<NonNullAttr>(), 7263 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7264 const NonNullAttr *NonNull = *i; 7265 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7266 } 7267 7268 MarkDeclarationReferenced(ConstructLoc, Constructor); 7269 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7270 Constructor, Elidable, Exprs, NumExprs, 7271 RequiresZeroInit, 7272 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7273 ParenRange)); 7274} 7275 7276bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7277 CXXConstructorDecl *Constructor, 7278 MultiExprArg Exprs) { 7279 // FIXME: Provide the correct paren SourceRange when available. 7280 ExprResult TempResult = 7281 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7282 move(Exprs), false, CXXConstructExpr::CK_Complete, 7283 SourceRange()); 7284 if (TempResult.isInvalid()) 7285 return true; 7286 7287 Expr *Temp = TempResult.takeAs<Expr>(); 7288 CheckImplicitConversions(Temp, VD->getLocation()); 7289 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7290 Temp = MaybeCreateExprWithCleanups(Temp); 7291 VD->setInit(Temp); 7292 7293 return false; 7294} 7295 7296void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7297 if (VD->isInvalidDecl()) return; 7298 7299 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7300 if (ClassDecl->isInvalidDecl()) return; 7301 if (ClassDecl->hasTrivialDestructor()) return; 7302 if (ClassDecl->isDependentContext()) return; 7303 7304 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7305 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7306 CheckDestructorAccess(VD->getLocation(), Destructor, 7307 PDiag(diag::err_access_dtor_var) 7308 << VD->getDeclName() 7309 << VD->getType()); 7310 7311 if (!VD->hasGlobalStorage()) return; 7312 7313 // Emit warning for non-trivial dtor in global scope (a real global, 7314 // class-static, function-static). 7315 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7316 7317 // TODO: this should be re-enabled for static locals by !CXAAtExit 7318 if (!VD->isStaticLocal()) 7319 Diag(VD->getLocation(), diag::warn_global_destructor); 7320} 7321 7322/// AddCXXDirectInitializerToDecl - This action is called immediately after 7323/// ActOnDeclarator, when a C++ direct initializer is present. 7324/// e.g: "int x(1);" 7325void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7326 SourceLocation LParenLoc, 7327 MultiExprArg Exprs, 7328 SourceLocation RParenLoc, 7329 bool TypeMayContainAuto) { 7330 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7331 7332 // If there is no declaration, there was an error parsing it. Just ignore 7333 // the initializer. 7334 if (RealDecl == 0) 7335 return; 7336 7337 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7338 if (!VDecl) { 7339 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7340 RealDecl->setInvalidDecl(); 7341 return; 7342 } 7343 7344 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7345 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7346 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7347 if (Exprs.size() > 1) { 7348 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7349 diag::err_auto_var_init_multiple_expressions) 7350 << VDecl->getDeclName() << VDecl->getType() 7351 << VDecl->getSourceRange(); 7352 RealDecl->setInvalidDecl(); 7353 return; 7354 } 7355 7356 Expr *Init = Exprs.get()[0]; 7357 TypeSourceInfo *DeducedType = 0; 7358 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7359 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7360 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7361 << Init->getSourceRange(); 7362 if (!DeducedType) { 7363 RealDecl->setInvalidDecl(); 7364 return; 7365 } 7366 VDecl->setTypeSourceInfo(DeducedType); 7367 VDecl->setType(DeducedType->getType()); 7368 7369 // If this is a redeclaration, check that the type we just deduced matches 7370 // the previously declared type. 7371 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7372 MergeVarDeclTypes(VDecl, Old); 7373 } 7374 7375 // We will represent direct-initialization similarly to copy-initialization: 7376 // int x(1); -as-> int x = 1; 7377 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7378 // 7379 // Clients that want to distinguish between the two forms, can check for 7380 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7381 // A major benefit is that clients that don't particularly care about which 7382 // exactly form was it (like the CodeGen) can handle both cases without 7383 // special case code. 7384 7385 // C++ 8.5p11: 7386 // The form of initialization (using parentheses or '=') is generally 7387 // insignificant, but does matter when the entity being initialized has a 7388 // class type. 7389 7390 if (!VDecl->getType()->isDependentType() && 7391 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7392 diag::err_typecheck_decl_incomplete_type)) { 7393 VDecl->setInvalidDecl(); 7394 return; 7395 } 7396 7397 // The variable can not have an abstract class type. 7398 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7399 diag::err_abstract_type_in_decl, 7400 AbstractVariableType)) 7401 VDecl->setInvalidDecl(); 7402 7403 const VarDecl *Def; 7404 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7405 Diag(VDecl->getLocation(), diag::err_redefinition) 7406 << VDecl->getDeclName(); 7407 Diag(Def->getLocation(), diag::note_previous_definition); 7408 VDecl->setInvalidDecl(); 7409 return; 7410 } 7411 7412 // C++ [class.static.data]p4 7413 // If a static data member is of const integral or const 7414 // enumeration type, its declaration in the class definition can 7415 // specify a constant-initializer which shall be an integral 7416 // constant expression (5.19). In that case, the member can appear 7417 // in integral constant expressions. The member shall still be 7418 // defined in a namespace scope if it is used in the program and the 7419 // namespace scope definition shall not contain an initializer. 7420 // 7421 // We already performed a redefinition check above, but for static 7422 // data members we also need to check whether there was an in-class 7423 // declaration with an initializer. 7424 const VarDecl* PrevInit = 0; 7425 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7426 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7427 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7428 return; 7429 } 7430 7431 bool IsDependent = false; 7432 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7433 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7434 VDecl->setInvalidDecl(); 7435 return; 7436 } 7437 7438 if (Exprs.get()[I]->isTypeDependent()) 7439 IsDependent = true; 7440 } 7441 7442 // If either the declaration has a dependent type or if any of the 7443 // expressions is type-dependent, we represent the initialization 7444 // via a ParenListExpr for later use during template instantiation. 7445 if (VDecl->getType()->isDependentType() || IsDependent) { 7446 // Let clients know that initialization was done with a direct initializer. 7447 VDecl->setCXXDirectInitializer(true); 7448 7449 // Store the initialization expressions as a ParenListExpr. 7450 unsigned NumExprs = Exprs.size(); 7451 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7452 (Expr **)Exprs.release(), 7453 NumExprs, RParenLoc)); 7454 return; 7455 } 7456 7457 // Capture the variable that is being initialized and the style of 7458 // initialization. 7459 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7460 7461 // FIXME: Poor source location information. 7462 InitializationKind Kind 7463 = InitializationKind::CreateDirect(VDecl->getLocation(), 7464 LParenLoc, RParenLoc); 7465 7466 InitializationSequence InitSeq(*this, Entity, Kind, 7467 Exprs.get(), Exprs.size()); 7468 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7469 if (Result.isInvalid()) { 7470 VDecl->setInvalidDecl(); 7471 return; 7472 } 7473 7474 CheckImplicitConversions(Result.get(), LParenLoc); 7475 7476 Result = MaybeCreateExprWithCleanups(Result); 7477 VDecl->setInit(Result.takeAs<Expr>()); 7478 VDecl->setCXXDirectInitializer(true); 7479 7480 CheckCompleteVariableDeclaration(VDecl); 7481} 7482 7483/// \brief Given a constructor and the set of arguments provided for the 7484/// constructor, convert the arguments and add any required default arguments 7485/// to form a proper call to this constructor. 7486/// 7487/// \returns true if an error occurred, false otherwise. 7488bool 7489Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7490 MultiExprArg ArgsPtr, 7491 SourceLocation Loc, 7492 ASTOwningVector<Expr*> &ConvertedArgs) { 7493 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7494 unsigned NumArgs = ArgsPtr.size(); 7495 Expr **Args = (Expr **)ArgsPtr.get(); 7496 7497 const FunctionProtoType *Proto 7498 = Constructor->getType()->getAs<FunctionProtoType>(); 7499 assert(Proto && "Constructor without a prototype?"); 7500 unsigned NumArgsInProto = Proto->getNumArgs(); 7501 7502 // If too few arguments are available, we'll fill in the rest with defaults. 7503 if (NumArgs < NumArgsInProto) 7504 ConvertedArgs.reserve(NumArgsInProto); 7505 else 7506 ConvertedArgs.reserve(NumArgs); 7507 7508 VariadicCallType CallType = 7509 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7510 llvm::SmallVector<Expr *, 8> AllArgs; 7511 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7512 Proto, 0, Args, NumArgs, AllArgs, 7513 CallType); 7514 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7515 ConvertedArgs.push_back(AllArgs[i]); 7516 return Invalid; 7517} 7518 7519static inline bool 7520CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7521 const FunctionDecl *FnDecl) { 7522 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7523 if (isa<NamespaceDecl>(DC)) { 7524 return SemaRef.Diag(FnDecl->getLocation(), 7525 diag::err_operator_new_delete_declared_in_namespace) 7526 << FnDecl->getDeclName(); 7527 } 7528 7529 if (isa<TranslationUnitDecl>(DC) && 7530 FnDecl->getStorageClass() == SC_Static) { 7531 return SemaRef.Diag(FnDecl->getLocation(), 7532 diag::err_operator_new_delete_declared_static) 7533 << FnDecl->getDeclName(); 7534 } 7535 7536 return false; 7537} 7538 7539static inline bool 7540CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7541 CanQualType ExpectedResultType, 7542 CanQualType ExpectedFirstParamType, 7543 unsigned DependentParamTypeDiag, 7544 unsigned InvalidParamTypeDiag) { 7545 QualType ResultType = 7546 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7547 7548 // Check that the result type is not dependent. 7549 if (ResultType->isDependentType()) 7550 return SemaRef.Diag(FnDecl->getLocation(), 7551 diag::err_operator_new_delete_dependent_result_type) 7552 << FnDecl->getDeclName() << ExpectedResultType; 7553 7554 // Check that the result type is what we expect. 7555 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7556 return SemaRef.Diag(FnDecl->getLocation(), 7557 diag::err_operator_new_delete_invalid_result_type) 7558 << FnDecl->getDeclName() << ExpectedResultType; 7559 7560 // A function template must have at least 2 parameters. 7561 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7562 return SemaRef.Diag(FnDecl->getLocation(), 7563 diag::err_operator_new_delete_template_too_few_parameters) 7564 << FnDecl->getDeclName(); 7565 7566 // The function decl must have at least 1 parameter. 7567 if (FnDecl->getNumParams() == 0) 7568 return SemaRef.Diag(FnDecl->getLocation(), 7569 diag::err_operator_new_delete_too_few_parameters) 7570 << FnDecl->getDeclName(); 7571 7572 // Check the the first parameter type is not dependent. 7573 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7574 if (FirstParamType->isDependentType()) 7575 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7576 << FnDecl->getDeclName() << ExpectedFirstParamType; 7577 7578 // Check that the first parameter type is what we expect. 7579 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7580 ExpectedFirstParamType) 7581 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7582 << FnDecl->getDeclName() << ExpectedFirstParamType; 7583 7584 return false; 7585} 7586 7587static bool 7588CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7589 // C++ [basic.stc.dynamic.allocation]p1: 7590 // A program is ill-formed if an allocation function is declared in a 7591 // namespace scope other than global scope or declared static in global 7592 // scope. 7593 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7594 return true; 7595 7596 CanQualType SizeTy = 7597 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7598 7599 // C++ [basic.stc.dynamic.allocation]p1: 7600 // The return type shall be void*. The first parameter shall have type 7601 // std::size_t. 7602 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7603 SizeTy, 7604 diag::err_operator_new_dependent_param_type, 7605 diag::err_operator_new_param_type)) 7606 return true; 7607 7608 // C++ [basic.stc.dynamic.allocation]p1: 7609 // The first parameter shall not have an associated default argument. 7610 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7611 return SemaRef.Diag(FnDecl->getLocation(), 7612 diag::err_operator_new_default_arg) 7613 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7614 7615 return false; 7616} 7617 7618static bool 7619CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7620 // C++ [basic.stc.dynamic.deallocation]p1: 7621 // A program is ill-formed if deallocation functions are declared in a 7622 // namespace scope other than global scope or declared static in global 7623 // scope. 7624 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7625 return true; 7626 7627 // C++ [basic.stc.dynamic.deallocation]p2: 7628 // Each deallocation function shall return void and its first parameter 7629 // shall be void*. 7630 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7631 SemaRef.Context.VoidPtrTy, 7632 diag::err_operator_delete_dependent_param_type, 7633 diag::err_operator_delete_param_type)) 7634 return true; 7635 7636 return false; 7637} 7638 7639/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7640/// of this overloaded operator is well-formed. If so, returns false; 7641/// otherwise, emits appropriate diagnostics and returns true. 7642bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7643 assert(FnDecl && FnDecl->isOverloadedOperator() && 7644 "Expected an overloaded operator declaration"); 7645 7646 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7647 7648 // C++ [over.oper]p5: 7649 // The allocation and deallocation functions, operator new, 7650 // operator new[], operator delete and operator delete[], are 7651 // described completely in 3.7.3. The attributes and restrictions 7652 // found in the rest of this subclause do not apply to them unless 7653 // explicitly stated in 3.7.3. 7654 if (Op == OO_Delete || Op == OO_Array_Delete) 7655 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7656 7657 if (Op == OO_New || Op == OO_Array_New) 7658 return CheckOperatorNewDeclaration(*this, FnDecl); 7659 7660 // C++ [over.oper]p6: 7661 // An operator function shall either be a non-static member 7662 // function or be a non-member function and have at least one 7663 // parameter whose type is a class, a reference to a class, an 7664 // enumeration, or a reference to an enumeration. 7665 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7666 if (MethodDecl->isStatic()) 7667 return Diag(FnDecl->getLocation(), 7668 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7669 } else { 7670 bool ClassOrEnumParam = false; 7671 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7672 ParamEnd = FnDecl->param_end(); 7673 Param != ParamEnd; ++Param) { 7674 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7675 if (ParamType->isDependentType() || ParamType->isRecordType() || 7676 ParamType->isEnumeralType()) { 7677 ClassOrEnumParam = true; 7678 break; 7679 } 7680 } 7681 7682 if (!ClassOrEnumParam) 7683 return Diag(FnDecl->getLocation(), 7684 diag::err_operator_overload_needs_class_or_enum) 7685 << FnDecl->getDeclName(); 7686 } 7687 7688 // C++ [over.oper]p8: 7689 // An operator function cannot have default arguments (8.3.6), 7690 // except where explicitly stated below. 7691 // 7692 // Only the function-call operator allows default arguments 7693 // (C++ [over.call]p1). 7694 if (Op != OO_Call) { 7695 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7696 Param != FnDecl->param_end(); ++Param) { 7697 if ((*Param)->hasDefaultArg()) 7698 return Diag((*Param)->getLocation(), 7699 diag::err_operator_overload_default_arg) 7700 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7701 } 7702 } 7703 7704 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7705 { false, false, false } 7706#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7707 , { Unary, Binary, MemberOnly } 7708#include "clang/Basic/OperatorKinds.def" 7709 }; 7710 7711 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7712 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7713 bool MustBeMemberOperator = OperatorUses[Op][2]; 7714 7715 // C++ [over.oper]p8: 7716 // [...] Operator functions cannot have more or fewer parameters 7717 // than the number required for the corresponding operator, as 7718 // described in the rest of this subclause. 7719 unsigned NumParams = FnDecl->getNumParams() 7720 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7721 if (Op != OO_Call && 7722 ((NumParams == 1 && !CanBeUnaryOperator) || 7723 (NumParams == 2 && !CanBeBinaryOperator) || 7724 (NumParams < 1) || (NumParams > 2))) { 7725 // We have the wrong number of parameters. 7726 unsigned ErrorKind; 7727 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7728 ErrorKind = 2; // 2 -> unary or binary. 7729 } else if (CanBeUnaryOperator) { 7730 ErrorKind = 0; // 0 -> unary 7731 } else { 7732 assert(CanBeBinaryOperator && 7733 "All non-call overloaded operators are unary or binary!"); 7734 ErrorKind = 1; // 1 -> binary 7735 } 7736 7737 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7738 << FnDecl->getDeclName() << NumParams << ErrorKind; 7739 } 7740 7741 // Overloaded operators other than operator() cannot be variadic. 7742 if (Op != OO_Call && 7743 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7744 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7745 << FnDecl->getDeclName(); 7746 } 7747 7748 // Some operators must be non-static member functions. 7749 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7750 return Diag(FnDecl->getLocation(), 7751 diag::err_operator_overload_must_be_member) 7752 << FnDecl->getDeclName(); 7753 } 7754 7755 // C++ [over.inc]p1: 7756 // The user-defined function called operator++ implements the 7757 // prefix and postfix ++ operator. If this function is a member 7758 // function with no parameters, or a non-member function with one 7759 // parameter of class or enumeration type, it defines the prefix 7760 // increment operator ++ for objects of that type. If the function 7761 // is a member function with one parameter (which shall be of type 7762 // int) or a non-member function with two parameters (the second 7763 // of which shall be of type int), it defines the postfix 7764 // increment operator ++ for objects of that type. 7765 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7766 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7767 bool ParamIsInt = false; 7768 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7769 ParamIsInt = BT->getKind() == BuiltinType::Int; 7770 7771 if (!ParamIsInt) 7772 return Diag(LastParam->getLocation(), 7773 diag::err_operator_overload_post_incdec_must_be_int) 7774 << LastParam->getType() << (Op == OO_MinusMinus); 7775 } 7776 7777 return false; 7778} 7779 7780/// CheckLiteralOperatorDeclaration - Check whether the declaration 7781/// of this literal operator function is well-formed. If so, returns 7782/// false; otherwise, emits appropriate diagnostics and returns true. 7783bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7784 DeclContext *DC = FnDecl->getDeclContext(); 7785 Decl::Kind Kind = DC->getDeclKind(); 7786 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7787 Kind != Decl::LinkageSpec) { 7788 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7789 << FnDecl->getDeclName(); 7790 return true; 7791 } 7792 7793 bool Valid = false; 7794 7795 // template <char...> type operator "" name() is the only valid template 7796 // signature, and the only valid signature with no parameters. 7797 if (FnDecl->param_size() == 0) { 7798 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7799 // Must have only one template parameter 7800 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7801 if (Params->size() == 1) { 7802 NonTypeTemplateParmDecl *PmDecl = 7803 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7804 7805 // The template parameter must be a char parameter pack. 7806 if (PmDecl && PmDecl->isTemplateParameterPack() && 7807 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7808 Valid = true; 7809 } 7810 } 7811 } else { 7812 // Check the first parameter 7813 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7814 7815 QualType T = (*Param)->getType(); 7816 7817 // unsigned long long int, long double, and any character type are allowed 7818 // as the only parameters. 7819 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7820 Context.hasSameType(T, Context.LongDoubleTy) || 7821 Context.hasSameType(T, Context.CharTy) || 7822 Context.hasSameType(T, Context.WCharTy) || 7823 Context.hasSameType(T, Context.Char16Ty) || 7824 Context.hasSameType(T, Context.Char32Ty)) { 7825 if (++Param == FnDecl->param_end()) 7826 Valid = true; 7827 goto FinishedParams; 7828 } 7829 7830 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7831 const PointerType *PT = T->getAs<PointerType>(); 7832 if (!PT) 7833 goto FinishedParams; 7834 T = PT->getPointeeType(); 7835 if (!T.isConstQualified()) 7836 goto FinishedParams; 7837 T = T.getUnqualifiedType(); 7838 7839 // Move on to the second parameter; 7840 ++Param; 7841 7842 // If there is no second parameter, the first must be a const char * 7843 if (Param == FnDecl->param_end()) { 7844 if (Context.hasSameType(T, Context.CharTy)) 7845 Valid = true; 7846 goto FinishedParams; 7847 } 7848 7849 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7850 // are allowed as the first parameter to a two-parameter function 7851 if (!(Context.hasSameType(T, Context.CharTy) || 7852 Context.hasSameType(T, Context.WCharTy) || 7853 Context.hasSameType(T, Context.Char16Ty) || 7854 Context.hasSameType(T, Context.Char32Ty))) 7855 goto FinishedParams; 7856 7857 // The second and final parameter must be an std::size_t 7858 T = (*Param)->getType().getUnqualifiedType(); 7859 if (Context.hasSameType(T, Context.getSizeType()) && 7860 ++Param == FnDecl->param_end()) 7861 Valid = true; 7862 } 7863 7864 // FIXME: This diagnostic is absolutely terrible. 7865FinishedParams: 7866 if (!Valid) { 7867 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7868 << FnDecl->getDeclName(); 7869 return true; 7870 } 7871 7872 return false; 7873} 7874 7875/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7876/// linkage specification, including the language and (if present) 7877/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7878/// the location of the language string literal, which is provided 7879/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7880/// the '{' brace. Otherwise, this linkage specification does not 7881/// have any braces. 7882Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7883 SourceLocation LangLoc, 7884 llvm::StringRef Lang, 7885 SourceLocation LBraceLoc) { 7886 LinkageSpecDecl::LanguageIDs Language; 7887 if (Lang == "\"C\"") 7888 Language = LinkageSpecDecl::lang_c; 7889 else if (Lang == "\"C++\"") 7890 Language = LinkageSpecDecl::lang_cxx; 7891 else { 7892 Diag(LangLoc, diag::err_bad_language); 7893 return 0; 7894 } 7895 7896 // FIXME: Add all the various semantics of linkage specifications 7897 7898 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7899 ExternLoc, LangLoc, Language); 7900 CurContext->addDecl(D); 7901 PushDeclContext(S, D); 7902 return D; 7903} 7904 7905/// ActOnFinishLinkageSpecification - Complete the definition of 7906/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7907/// valid, it's the position of the closing '}' brace in a linkage 7908/// specification that uses braces. 7909Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7910 Decl *LinkageSpec, 7911 SourceLocation RBraceLoc) { 7912 if (LinkageSpec) { 7913 if (RBraceLoc.isValid()) { 7914 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7915 LSDecl->setRBraceLoc(RBraceLoc); 7916 } 7917 PopDeclContext(); 7918 } 7919 return LinkageSpec; 7920} 7921 7922/// \brief Perform semantic analysis for the variable declaration that 7923/// occurs within a C++ catch clause, returning the newly-created 7924/// variable. 7925VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7926 TypeSourceInfo *TInfo, 7927 SourceLocation StartLoc, 7928 SourceLocation Loc, 7929 IdentifierInfo *Name) { 7930 bool Invalid = false; 7931 QualType ExDeclType = TInfo->getType(); 7932 7933 // Arrays and functions decay. 7934 if (ExDeclType->isArrayType()) 7935 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7936 else if (ExDeclType->isFunctionType()) 7937 ExDeclType = Context.getPointerType(ExDeclType); 7938 7939 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7940 // The exception-declaration shall not denote a pointer or reference to an 7941 // incomplete type, other than [cv] void*. 7942 // N2844 forbids rvalue references. 7943 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7944 Diag(Loc, diag::err_catch_rvalue_ref); 7945 Invalid = true; 7946 } 7947 7948 // GCC allows catching pointers and references to incomplete types 7949 // as an extension; so do we, but we warn by default. 7950 7951 QualType BaseType = ExDeclType; 7952 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7953 unsigned DK = diag::err_catch_incomplete; 7954 bool IncompleteCatchIsInvalid = true; 7955 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7956 BaseType = Ptr->getPointeeType(); 7957 Mode = 1; 7958 DK = diag::ext_catch_incomplete_ptr; 7959 IncompleteCatchIsInvalid = false; 7960 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7961 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7962 BaseType = Ref->getPointeeType(); 7963 Mode = 2; 7964 DK = diag::ext_catch_incomplete_ref; 7965 IncompleteCatchIsInvalid = false; 7966 } 7967 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7968 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7969 IncompleteCatchIsInvalid) 7970 Invalid = true; 7971 7972 if (!Invalid && !ExDeclType->isDependentType() && 7973 RequireNonAbstractType(Loc, ExDeclType, 7974 diag::err_abstract_type_in_decl, 7975 AbstractVariableType)) 7976 Invalid = true; 7977 7978 // Only the non-fragile NeXT runtime currently supports C++ catches 7979 // of ObjC types, and no runtime supports catching ObjC types by value. 7980 if (!Invalid && getLangOptions().ObjC1) { 7981 QualType T = ExDeclType; 7982 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7983 T = RT->getPointeeType(); 7984 7985 if (T->isObjCObjectType()) { 7986 Diag(Loc, diag::err_objc_object_catch); 7987 Invalid = true; 7988 } else if (T->isObjCObjectPointerType()) { 7989 if (!getLangOptions().ObjCNonFragileABI) { 7990 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7991 Invalid = true; 7992 } 7993 } 7994 } 7995 7996 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7997 ExDeclType, TInfo, SC_None, SC_None); 7998 ExDecl->setExceptionVariable(true); 7999 8000 if (!Invalid) { 8001 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8002 // C++ [except.handle]p16: 8003 // The object declared in an exception-declaration or, if the 8004 // exception-declaration does not specify a name, a temporary (12.2) is 8005 // copy-initialized (8.5) from the exception object. [...] 8006 // The object is destroyed when the handler exits, after the destruction 8007 // of any automatic objects initialized within the handler. 8008 // 8009 // We just pretend to initialize the object with itself, then make sure 8010 // it can be destroyed later. 8011 QualType initType = ExDeclType; 8012 8013 InitializedEntity entity = 8014 InitializedEntity::InitializeVariable(ExDecl); 8015 InitializationKind initKind = 8016 InitializationKind::CreateCopy(Loc, SourceLocation()); 8017 8018 Expr *opaqueValue = 8019 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8020 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8021 ExprResult result = sequence.Perform(*this, entity, initKind, 8022 MultiExprArg(&opaqueValue, 1)); 8023 if (result.isInvalid()) 8024 Invalid = true; 8025 else { 8026 // If the constructor used was non-trivial, set this as the 8027 // "initializer". 8028 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8029 if (!construct->getConstructor()->isTrivial()) { 8030 Expr *init = MaybeCreateExprWithCleanups(construct); 8031 ExDecl->setInit(init); 8032 } 8033 8034 // And make sure it's destructable. 8035 FinalizeVarWithDestructor(ExDecl, recordType); 8036 } 8037 } 8038 } 8039 8040 if (Invalid) 8041 ExDecl->setInvalidDecl(); 8042 8043 return ExDecl; 8044} 8045 8046/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8047/// handler. 8048Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8049 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8050 bool Invalid = D.isInvalidType(); 8051 8052 // Check for unexpanded parameter packs. 8053 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8054 UPPC_ExceptionType)) { 8055 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8056 D.getIdentifierLoc()); 8057 Invalid = true; 8058 } 8059 8060 IdentifierInfo *II = D.getIdentifier(); 8061 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8062 LookupOrdinaryName, 8063 ForRedeclaration)) { 8064 // The scope should be freshly made just for us. There is just no way 8065 // it contains any previous declaration. 8066 assert(!S->isDeclScope(PrevDecl)); 8067 if (PrevDecl->isTemplateParameter()) { 8068 // Maybe we will complain about the shadowed template parameter. 8069 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8070 } 8071 } 8072 8073 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8074 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8075 << D.getCXXScopeSpec().getRange(); 8076 Invalid = true; 8077 } 8078 8079 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8080 D.getSourceRange().getBegin(), 8081 D.getIdentifierLoc(), 8082 D.getIdentifier()); 8083 if (Invalid) 8084 ExDecl->setInvalidDecl(); 8085 8086 // Add the exception declaration into this scope. 8087 if (II) 8088 PushOnScopeChains(ExDecl, S); 8089 else 8090 CurContext->addDecl(ExDecl); 8091 8092 ProcessDeclAttributes(S, ExDecl, D); 8093 return ExDecl; 8094} 8095 8096Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8097 Expr *AssertExpr, 8098 Expr *AssertMessageExpr_, 8099 SourceLocation RParenLoc) { 8100 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8101 8102 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8103 llvm::APSInt Value(32); 8104 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8105 Diag(StaticAssertLoc, 8106 diag::err_static_assert_expression_is_not_constant) << 8107 AssertExpr->getSourceRange(); 8108 return 0; 8109 } 8110 8111 if (Value == 0) { 8112 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8113 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8114 } 8115 } 8116 8117 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8118 return 0; 8119 8120 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8121 AssertExpr, AssertMessage, RParenLoc); 8122 8123 CurContext->addDecl(Decl); 8124 return Decl; 8125} 8126 8127/// \brief Perform semantic analysis of the given friend type declaration. 8128/// 8129/// \returns A friend declaration that. 8130FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8131 TypeSourceInfo *TSInfo) { 8132 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8133 8134 QualType T = TSInfo->getType(); 8135 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8136 8137 if (!getLangOptions().CPlusPlus0x) { 8138 // C++03 [class.friend]p2: 8139 // An elaborated-type-specifier shall be used in a friend declaration 8140 // for a class.* 8141 // 8142 // * The class-key of the elaborated-type-specifier is required. 8143 if (!ActiveTemplateInstantiations.empty()) { 8144 // Do not complain about the form of friend template types during 8145 // template instantiation; we will already have complained when the 8146 // template was declared. 8147 } else if (!T->isElaboratedTypeSpecifier()) { 8148 // If we evaluated the type to a record type, suggest putting 8149 // a tag in front. 8150 if (const RecordType *RT = T->getAs<RecordType>()) { 8151 RecordDecl *RD = RT->getDecl(); 8152 8153 std::string InsertionText = std::string(" ") + RD->getKindName(); 8154 8155 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8156 << (unsigned) RD->getTagKind() 8157 << T 8158 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8159 InsertionText); 8160 } else { 8161 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8162 << T 8163 << SourceRange(FriendLoc, TypeRange.getEnd()); 8164 } 8165 } else if (T->getAs<EnumType>()) { 8166 Diag(FriendLoc, diag::ext_enum_friend) 8167 << T 8168 << SourceRange(FriendLoc, TypeRange.getEnd()); 8169 } 8170 } 8171 8172 // C++0x [class.friend]p3: 8173 // If the type specifier in a friend declaration designates a (possibly 8174 // cv-qualified) class type, that class is declared as a friend; otherwise, 8175 // the friend declaration is ignored. 8176 8177 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8178 // in [class.friend]p3 that we do not implement. 8179 8180 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8181} 8182 8183/// Handle a friend tag declaration where the scope specifier was 8184/// templated. 8185Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8186 unsigned TagSpec, SourceLocation TagLoc, 8187 CXXScopeSpec &SS, 8188 IdentifierInfo *Name, SourceLocation NameLoc, 8189 AttributeList *Attr, 8190 MultiTemplateParamsArg TempParamLists) { 8191 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8192 8193 bool isExplicitSpecialization = false; 8194 bool Invalid = false; 8195 8196 if (TemplateParameterList *TemplateParams 8197 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8198 TempParamLists.get(), 8199 TempParamLists.size(), 8200 /*friend*/ true, 8201 isExplicitSpecialization, 8202 Invalid)) { 8203 if (TemplateParams->size() > 0) { 8204 // This is a declaration of a class template. 8205 if (Invalid) 8206 return 0; 8207 8208 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8209 SS, Name, NameLoc, Attr, 8210 TemplateParams, AS_public, 8211 TempParamLists.size() - 1, 8212 (TemplateParameterList**) TempParamLists.release()).take(); 8213 } else { 8214 // The "template<>" header is extraneous. 8215 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8216 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8217 isExplicitSpecialization = true; 8218 } 8219 } 8220 8221 if (Invalid) return 0; 8222 8223 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8224 8225 bool isAllExplicitSpecializations = true; 8226 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8227 if (TempParamLists.get()[I]->size()) { 8228 isAllExplicitSpecializations = false; 8229 break; 8230 } 8231 } 8232 8233 // FIXME: don't ignore attributes. 8234 8235 // If it's explicit specializations all the way down, just forget 8236 // about the template header and build an appropriate non-templated 8237 // friend. TODO: for source fidelity, remember the headers. 8238 if (isAllExplicitSpecializations) { 8239 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8240 ElaboratedTypeKeyword Keyword 8241 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8242 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8243 *Name, NameLoc); 8244 if (T.isNull()) 8245 return 0; 8246 8247 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8248 if (isa<DependentNameType>(T)) { 8249 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8250 TL.setKeywordLoc(TagLoc); 8251 TL.setQualifierLoc(QualifierLoc); 8252 TL.setNameLoc(NameLoc); 8253 } else { 8254 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8255 TL.setKeywordLoc(TagLoc); 8256 TL.setQualifierLoc(QualifierLoc); 8257 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8258 } 8259 8260 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8261 TSI, FriendLoc); 8262 Friend->setAccess(AS_public); 8263 CurContext->addDecl(Friend); 8264 return Friend; 8265 } 8266 8267 // Handle the case of a templated-scope friend class. e.g. 8268 // template <class T> class A<T>::B; 8269 // FIXME: we don't support these right now. 8270 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8271 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8272 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8273 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8274 TL.setKeywordLoc(TagLoc); 8275 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8276 TL.setNameLoc(NameLoc); 8277 8278 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8279 TSI, FriendLoc); 8280 Friend->setAccess(AS_public); 8281 Friend->setUnsupportedFriend(true); 8282 CurContext->addDecl(Friend); 8283 return Friend; 8284} 8285 8286 8287/// Handle a friend type declaration. This works in tandem with 8288/// ActOnTag. 8289/// 8290/// Notes on friend class templates: 8291/// 8292/// We generally treat friend class declarations as if they were 8293/// declaring a class. So, for example, the elaborated type specifier 8294/// in a friend declaration is required to obey the restrictions of a 8295/// class-head (i.e. no typedefs in the scope chain), template 8296/// parameters are required to match up with simple template-ids, &c. 8297/// However, unlike when declaring a template specialization, it's 8298/// okay to refer to a template specialization without an empty 8299/// template parameter declaration, e.g. 8300/// friend class A<T>::B<unsigned>; 8301/// We permit this as a special case; if there are any template 8302/// parameters present at all, require proper matching, i.e. 8303/// template <> template <class T> friend class A<int>::B; 8304Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8305 MultiTemplateParamsArg TempParams) { 8306 SourceLocation Loc = DS.getSourceRange().getBegin(); 8307 8308 assert(DS.isFriendSpecified()); 8309 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8310 8311 // Try to convert the decl specifier to a type. This works for 8312 // friend templates because ActOnTag never produces a ClassTemplateDecl 8313 // for a TUK_Friend. 8314 Declarator TheDeclarator(DS, Declarator::MemberContext); 8315 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8316 QualType T = TSI->getType(); 8317 if (TheDeclarator.isInvalidType()) 8318 return 0; 8319 8320 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8321 return 0; 8322 8323 // This is definitely an error in C++98. It's probably meant to 8324 // be forbidden in C++0x, too, but the specification is just 8325 // poorly written. 8326 // 8327 // The problem is with declarations like the following: 8328 // template <T> friend A<T>::foo; 8329 // where deciding whether a class C is a friend or not now hinges 8330 // on whether there exists an instantiation of A that causes 8331 // 'foo' to equal C. There are restrictions on class-heads 8332 // (which we declare (by fiat) elaborated friend declarations to 8333 // be) that makes this tractable. 8334 // 8335 // FIXME: handle "template <> friend class A<T>;", which 8336 // is possibly well-formed? Who even knows? 8337 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8338 Diag(Loc, diag::err_tagless_friend_type_template) 8339 << DS.getSourceRange(); 8340 return 0; 8341 } 8342 8343 // C++98 [class.friend]p1: A friend of a class is a function 8344 // or class that is not a member of the class . . . 8345 // This is fixed in DR77, which just barely didn't make the C++03 8346 // deadline. It's also a very silly restriction that seriously 8347 // affects inner classes and which nobody else seems to implement; 8348 // thus we never diagnose it, not even in -pedantic. 8349 // 8350 // But note that we could warn about it: it's always useless to 8351 // friend one of your own members (it's not, however, worthless to 8352 // friend a member of an arbitrary specialization of your template). 8353 8354 Decl *D; 8355 if (unsigned NumTempParamLists = TempParams.size()) 8356 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8357 NumTempParamLists, 8358 TempParams.release(), 8359 TSI, 8360 DS.getFriendSpecLoc()); 8361 else 8362 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8363 8364 if (!D) 8365 return 0; 8366 8367 D->setAccess(AS_public); 8368 CurContext->addDecl(D); 8369 8370 return D; 8371} 8372 8373Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8374 MultiTemplateParamsArg TemplateParams) { 8375 const DeclSpec &DS = D.getDeclSpec(); 8376 8377 assert(DS.isFriendSpecified()); 8378 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8379 8380 SourceLocation Loc = D.getIdentifierLoc(); 8381 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8382 QualType T = TInfo->getType(); 8383 8384 // C++ [class.friend]p1 8385 // A friend of a class is a function or class.... 8386 // Note that this sees through typedefs, which is intended. 8387 // It *doesn't* see through dependent types, which is correct 8388 // according to [temp.arg.type]p3: 8389 // If a declaration acquires a function type through a 8390 // type dependent on a template-parameter and this causes 8391 // a declaration that does not use the syntactic form of a 8392 // function declarator to have a function type, the program 8393 // is ill-formed. 8394 if (!T->isFunctionType()) { 8395 Diag(Loc, diag::err_unexpected_friend); 8396 8397 // It might be worthwhile to try to recover by creating an 8398 // appropriate declaration. 8399 return 0; 8400 } 8401 8402 // C++ [namespace.memdef]p3 8403 // - If a friend declaration in a non-local class first declares a 8404 // class or function, the friend class or function is a member 8405 // of the innermost enclosing namespace. 8406 // - The name of the friend is not found by simple name lookup 8407 // until a matching declaration is provided in that namespace 8408 // scope (either before or after the class declaration granting 8409 // friendship). 8410 // - If a friend function is called, its name may be found by the 8411 // name lookup that considers functions from namespaces and 8412 // classes associated with the types of the function arguments. 8413 // - When looking for a prior declaration of a class or a function 8414 // declared as a friend, scopes outside the innermost enclosing 8415 // namespace scope are not considered. 8416 8417 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8418 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8419 DeclarationName Name = NameInfo.getName(); 8420 assert(Name); 8421 8422 // Check for unexpanded parameter packs. 8423 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8424 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8425 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8426 return 0; 8427 8428 // The context we found the declaration in, or in which we should 8429 // create the declaration. 8430 DeclContext *DC; 8431 Scope *DCScope = S; 8432 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8433 ForRedeclaration); 8434 8435 // FIXME: there are different rules in local classes 8436 8437 // There are four cases here. 8438 // - There's no scope specifier, in which case we just go to the 8439 // appropriate scope and look for a function or function template 8440 // there as appropriate. 8441 // Recover from invalid scope qualifiers as if they just weren't there. 8442 if (SS.isInvalid() || !SS.isSet()) { 8443 // C++0x [namespace.memdef]p3: 8444 // If the name in a friend declaration is neither qualified nor 8445 // a template-id and the declaration is a function or an 8446 // elaborated-type-specifier, the lookup to determine whether 8447 // the entity has been previously declared shall not consider 8448 // any scopes outside the innermost enclosing namespace. 8449 // C++0x [class.friend]p11: 8450 // If a friend declaration appears in a local class and the name 8451 // specified is an unqualified name, a prior declaration is 8452 // looked up without considering scopes that are outside the 8453 // innermost enclosing non-class scope. For a friend function 8454 // declaration, if there is no prior declaration, the program is 8455 // ill-formed. 8456 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8457 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8458 8459 // Find the appropriate context according to the above. 8460 DC = CurContext; 8461 while (true) { 8462 // Skip class contexts. If someone can cite chapter and verse 8463 // for this behavior, that would be nice --- it's what GCC and 8464 // EDG do, and it seems like a reasonable intent, but the spec 8465 // really only says that checks for unqualified existing 8466 // declarations should stop at the nearest enclosing namespace, 8467 // not that they should only consider the nearest enclosing 8468 // namespace. 8469 while (DC->isRecord()) 8470 DC = DC->getParent(); 8471 8472 LookupQualifiedName(Previous, DC); 8473 8474 // TODO: decide what we think about using declarations. 8475 if (isLocal || !Previous.empty()) 8476 break; 8477 8478 if (isTemplateId) { 8479 if (isa<TranslationUnitDecl>(DC)) break; 8480 } else { 8481 if (DC->isFileContext()) break; 8482 } 8483 DC = DC->getParent(); 8484 } 8485 8486 // C++ [class.friend]p1: A friend of a class is a function or 8487 // class that is not a member of the class . . . 8488 // C++0x changes this for both friend types and functions. 8489 // Most C++ 98 compilers do seem to give an error here, so 8490 // we do, too. 8491 if (!Previous.empty() && DC->Equals(CurContext) 8492 && !getLangOptions().CPlusPlus0x) 8493 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8494 8495 DCScope = getScopeForDeclContext(S, DC); 8496 8497 // - There's a non-dependent scope specifier, in which case we 8498 // compute it and do a previous lookup there for a function 8499 // or function template. 8500 } else if (!SS.getScopeRep()->isDependent()) { 8501 DC = computeDeclContext(SS); 8502 if (!DC) return 0; 8503 8504 if (RequireCompleteDeclContext(SS, DC)) return 0; 8505 8506 LookupQualifiedName(Previous, DC); 8507 8508 // Ignore things found implicitly in the wrong scope. 8509 // TODO: better diagnostics for this case. Suggesting the right 8510 // qualified scope would be nice... 8511 LookupResult::Filter F = Previous.makeFilter(); 8512 while (F.hasNext()) { 8513 NamedDecl *D = F.next(); 8514 if (!DC->InEnclosingNamespaceSetOf( 8515 D->getDeclContext()->getRedeclContext())) 8516 F.erase(); 8517 } 8518 F.done(); 8519 8520 if (Previous.empty()) { 8521 D.setInvalidType(); 8522 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8523 return 0; 8524 } 8525 8526 // C++ [class.friend]p1: A friend of a class is a function or 8527 // class that is not a member of the class . . . 8528 if (DC->Equals(CurContext)) 8529 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8530 8531 // - There's a scope specifier that does not match any template 8532 // parameter lists, in which case we use some arbitrary context, 8533 // create a method or method template, and wait for instantiation. 8534 // - There's a scope specifier that does match some template 8535 // parameter lists, which we don't handle right now. 8536 } else { 8537 DC = CurContext; 8538 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8539 } 8540 8541 if (!DC->isRecord()) { 8542 // This implies that it has to be an operator or function. 8543 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8544 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8545 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8546 Diag(Loc, diag::err_introducing_special_friend) << 8547 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8548 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8549 return 0; 8550 } 8551 } 8552 8553 bool Redeclaration = false; 8554 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8555 move(TemplateParams), 8556 IsDefinition, 8557 Redeclaration); 8558 if (!ND) return 0; 8559 8560 assert(ND->getDeclContext() == DC); 8561 assert(ND->getLexicalDeclContext() == CurContext); 8562 8563 // Add the function declaration to the appropriate lookup tables, 8564 // adjusting the redeclarations list as necessary. We don't 8565 // want to do this yet if the friending class is dependent. 8566 // 8567 // Also update the scope-based lookup if the target context's 8568 // lookup context is in lexical scope. 8569 if (!CurContext->isDependentContext()) { 8570 DC = DC->getRedeclContext(); 8571 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8572 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8573 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8574 } 8575 8576 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8577 D.getIdentifierLoc(), ND, 8578 DS.getFriendSpecLoc()); 8579 FrD->setAccess(AS_public); 8580 CurContext->addDecl(FrD); 8581 8582 if (ND->isInvalidDecl()) 8583 FrD->setInvalidDecl(); 8584 else { 8585 FunctionDecl *FD; 8586 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8587 FD = FTD->getTemplatedDecl(); 8588 else 8589 FD = cast<FunctionDecl>(ND); 8590 8591 // Mark templated-scope function declarations as unsupported. 8592 if (FD->getNumTemplateParameterLists()) 8593 FrD->setUnsupportedFriend(true); 8594 } 8595 8596 return ND; 8597} 8598 8599void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8600 AdjustDeclIfTemplate(Dcl); 8601 8602 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8603 if (!Fn) { 8604 Diag(DelLoc, diag::err_deleted_non_function); 8605 return; 8606 } 8607 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8608 Diag(DelLoc, diag::err_deleted_decl_not_first); 8609 Diag(Prev->getLocation(), diag::note_previous_declaration); 8610 // If the declaration wasn't the first, we delete the function anyway for 8611 // recovery. 8612 } 8613 Fn->setDeletedAsWritten(); 8614} 8615 8616void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8617 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8618 8619 if (MD) { 8620 CXXSpecialMember Member = getSpecialMember(MD); 8621 if (Member == CXXInvalid) { 8622 Diag(DefaultLoc, diag::err_default_special_members); 8623 return; 8624 } 8625 8626 MD->setDefaulted(); 8627 MD->setExplicitlyDefaulted(); 8628 8629 // We'll check it when the record is done 8630 if (MD == MD->getCanonicalDecl()) 8631 return; 8632 8633 switch (Member) { 8634 case CXXDefaultConstructor: { 8635 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8636 CheckExplicitlyDefaultedDefaultConstructor(CD); 8637 if (!CD->isInvalidDecl()) 8638 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8639 break; 8640 } 8641 8642 case CXXCopyConstructor: { 8643 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8644 CheckExplicitlyDefaultedCopyConstructor(CD); 8645 if (!CD->isInvalidDecl()) 8646 DefineImplicitCopyConstructor(DefaultLoc, CD); 8647 break; 8648 } 8649 8650 case CXXCopyAssignment: { 8651 CheckExplicitlyDefaultedCopyAssignment(MD); 8652 if (!MD->isInvalidDecl()) 8653 DefineImplicitCopyAssignment(DefaultLoc, MD); 8654 break; 8655 } 8656 8657 case CXXDestructor: { 8658 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8659 CheckExplicitlyDefaultedDestructor(DD); 8660 if (!DD->isInvalidDecl()) 8661 DefineImplicitDestructor(DefaultLoc, DD); 8662 break; 8663 } 8664 8665 default: 8666 // FIXME: Do the rest once we have move functions 8667 break; 8668 } 8669 } else { 8670 Diag(DefaultLoc, diag::err_default_special_members); 8671 } 8672} 8673 8674static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8675 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8676 Stmt *SubStmt = *CI; 8677 if (!SubStmt) 8678 continue; 8679 if (isa<ReturnStmt>(SubStmt)) 8680 Self.Diag(SubStmt->getSourceRange().getBegin(), 8681 diag::err_return_in_constructor_handler); 8682 if (!isa<Expr>(SubStmt)) 8683 SearchForReturnInStmt(Self, SubStmt); 8684 } 8685} 8686 8687void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8688 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8689 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8690 SearchForReturnInStmt(*this, Handler); 8691 } 8692} 8693 8694bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8695 const CXXMethodDecl *Old) { 8696 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8697 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8698 8699 if (Context.hasSameType(NewTy, OldTy) || 8700 NewTy->isDependentType() || OldTy->isDependentType()) 8701 return false; 8702 8703 // Check if the return types are covariant 8704 QualType NewClassTy, OldClassTy; 8705 8706 /// Both types must be pointers or references to classes. 8707 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8708 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8709 NewClassTy = NewPT->getPointeeType(); 8710 OldClassTy = OldPT->getPointeeType(); 8711 } 8712 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8713 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8714 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8715 NewClassTy = NewRT->getPointeeType(); 8716 OldClassTy = OldRT->getPointeeType(); 8717 } 8718 } 8719 } 8720 8721 // The return types aren't either both pointers or references to a class type. 8722 if (NewClassTy.isNull()) { 8723 Diag(New->getLocation(), 8724 diag::err_different_return_type_for_overriding_virtual_function) 8725 << New->getDeclName() << NewTy << OldTy; 8726 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8727 8728 return true; 8729 } 8730 8731 // C++ [class.virtual]p6: 8732 // If the return type of D::f differs from the return type of B::f, the 8733 // class type in the return type of D::f shall be complete at the point of 8734 // declaration of D::f or shall be the class type D. 8735 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8736 if (!RT->isBeingDefined() && 8737 RequireCompleteType(New->getLocation(), NewClassTy, 8738 PDiag(diag::err_covariant_return_incomplete) 8739 << New->getDeclName())) 8740 return true; 8741 } 8742 8743 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8744 // Check if the new class derives from the old class. 8745 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8746 Diag(New->getLocation(), 8747 diag::err_covariant_return_not_derived) 8748 << New->getDeclName() << NewTy << OldTy; 8749 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8750 return true; 8751 } 8752 8753 // Check if we the conversion from derived to base is valid. 8754 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8755 diag::err_covariant_return_inaccessible_base, 8756 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8757 // FIXME: Should this point to the return type? 8758 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8759 // FIXME: this note won't trigger for delayed access control 8760 // diagnostics, and it's impossible to get an undelayed error 8761 // here from access control during the original parse because 8762 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8763 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8764 return true; 8765 } 8766 } 8767 8768 // The qualifiers of the return types must be the same. 8769 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8770 Diag(New->getLocation(), 8771 diag::err_covariant_return_type_different_qualifications) 8772 << New->getDeclName() << NewTy << OldTy; 8773 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8774 return true; 8775 }; 8776 8777 8778 // The new class type must have the same or less qualifiers as the old type. 8779 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8780 Diag(New->getLocation(), 8781 diag::err_covariant_return_type_class_type_more_qualified) 8782 << New->getDeclName() << NewTy << OldTy; 8783 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8784 return true; 8785 }; 8786 8787 return false; 8788} 8789 8790/// \brief Mark the given method pure. 8791/// 8792/// \param Method the method to be marked pure. 8793/// 8794/// \param InitRange the source range that covers the "0" initializer. 8795bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8796 SourceLocation EndLoc = InitRange.getEnd(); 8797 if (EndLoc.isValid()) 8798 Method->setRangeEnd(EndLoc); 8799 8800 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8801 Method->setPure(); 8802 return false; 8803 } 8804 8805 if (!Method->isInvalidDecl()) 8806 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8807 << Method->getDeclName() << InitRange; 8808 return true; 8809} 8810 8811/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8812/// an initializer for the out-of-line declaration 'Dcl'. The scope 8813/// is a fresh scope pushed for just this purpose. 8814/// 8815/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8816/// static data member of class X, names should be looked up in the scope of 8817/// class X. 8818void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8819 // If there is no declaration, there was an error parsing it. 8820 if (D == 0 || D->isInvalidDecl()) return; 8821 8822 // We should only get called for declarations with scope specifiers, like: 8823 // int foo::bar; 8824 assert(D->isOutOfLine()); 8825 EnterDeclaratorContext(S, D->getDeclContext()); 8826} 8827 8828/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8829/// initializer for the out-of-line declaration 'D'. 8830void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8831 // If there is no declaration, there was an error parsing it. 8832 if (D == 0 || D->isInvalidDecl()) return; 8833 8834 assert(D->isOutOfLine()); 8835 ExitDeclaratorContext(S); 8836} 8837 8838/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8839/// C++ if/switch/while/for statement. 8840/// e.g: "if (int x = f()) {...}" 8841DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8842 // C++ 6.4p2: 8843 // The declarator shall not specify a function or an array. 8844 // The type-specifier-seq shall not contain typedef and shall not declare a 8845 // new class or enumeration. 8846 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8847 "Parser allowed 'typedef' as storage class of condition decl."); 8848 8849 TagDecl *OwnedTag = 0; 8850 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8851 QualType Ty = TInfo->getType(); 8852 8853 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8854 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8855 // would be created and CXXConditionDeclExpr wants a VarDecl. 8856 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8857 << D.getSourceRange(); 8858 return DeclResult(); 8859 } else if (OwnedTag && OwnedTag->isDefinition()) { 8860 // The type-specifier-seq shall not declare a new class or enumeration. 8861 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8862 } 8863 8864 Decl *Dcl = ActOnDeclarator(S, D); 8865 if (!Dcl) 8866 return DeclResult(); 8867 8868 return Dcl; 8869} 8870 8871void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8872 bool DefinitionRequired) { 8873 // Ignore any vtable uses in unevaluated operands or for classes that do 8874 // not have a vtable. 8875 if (!Class->isDynamicClass() || Class->isDependentContext() || 8876 CurContext->isDependentContext() || 8877 ExprEvalContexts.back().Context == Unevaluated) 8878 return; 8879 8880 // Try to insert this class into the map. 8881 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8882 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8883 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8884 if (!Pos.second) { 8885 // If we already had an entry, check to see if we are promoting this vtable 8886 // to required a definition. If so, we need to reappend to the VTableUses 8887 // list, since we may have already processed the first entry. 8888 if (DefinitionRequired && !Pos.first->second) { 8889 Pos.first->second = true; 8890 } else { 8891 // Otherwise, we can early exit. 8892 return; 8893 } 8894 } 8895 8896 // Local classes need to have their virtual members marked 8897 // immediately. For all other classes, we mark their virtual members 8898 // at the end of the translation unit. 8899 if (Class->isLocalClass()) 8900 MarkVirtualMembersReferenced(Loc, Class); 8901 else 8902 VTableUses.push_back(std::make_pair(Class, Loc)); 8903} 8904 8905bool Sema::DefineUsedVTables() { 8906 if (VTableUses.empty()) 8907 return false; 8908 8909 // Note: The VTableUses vector could grow as a result of marking 8910 // the members of a class as "used", so we check the size each 8911 // time through the loop and prefer indices (with are stable) to 8912 // iterators (which are not). 8913 bool DefinedAnything = false; 8914 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8915 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8916 if (!Class) 8917 continue; 8918 8919 SourceLocation Loc = VTableUses[I].second; 8920 8921 // If this class has a key function, but that key function is 8922 // defined in another translation unit, we don't need to emit the 8923 // vtable even though we're using it. 8924 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8925 if (KeyFunction && !KeyFunction->hasBody()) { 8926 switch (KeyFunction->getTemplateSpecializationKind()) { 8927 case TSK_Undeclared: 8928 case TSK_ExplicitSpecialization: 8929 case TSK_ExplicitInstantiationDeclaration: 8930 // The key function is in another translation unit. 8931 continue; 8932 8933 case TSK_ExplicitInstantiationDefinition: 8934 case TSK_ImplicitInstantiation: 8935 // We will be instantiating the key function. 8936 break; 8937 } 8938 } else if (!KeyFunction) { 8939 // If we have a class with no key function that is the subject 8940 // of an explicit instantiation declaration, suppress the 8941 // vtable; it will live with the explicit instantiation 8942 // definition. 8943 bool IsExplicitInstantiationDeclaration 8944 = Class->getTemplateSpecializationKind() 8945 == TSK_ExplicitInstantiationDeclaration; 8946 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8947 REnd = Class->redecls_end(); 8948 R != REnd; ++R) { 8949 TemplateSpecializationKind TSK 8950 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8951 if (TSK == TSK_ExplicitInstantiationDeclaration) 8952 IsExplicitInstantiationDeclaration = true; 8953 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8954 IsExplicitInstantiationDeclaration = false; 8955 break; 8956 } 8957 } 8958 8959 if (IsExplicitInstantiationDeclaration) 8960 continue; 8961 } 8962 8963 // Mark all of the virtual members of this class as referenced, so 8964 // that we can build a vtable. Then, tell the AST consumer that a 8965 // vtable for this class is required. 8966 DefinedAnything = true; 8967 MarkVirtualMembersReferenced(Loc, Class); 8968 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8969 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8970 8971 // Optionally warn if we're emitting a weak vtable. 8972 if (Class->getLinkage() == ExternalLinkage && 8973 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 8974 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 8975 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 8976 } 8977 } 8978 VTableUses.clear(); 8979 8980 return DefinedAnything; 8981} 8982 8983void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 8984 const CXXRecordDecl *RD) { 8985 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 8986 e = RD->method_end(); i != e; ++i) { 8987 CXXMethodDecl *MD = *i; 8988 8989 // C++ [basic.def.odr]p2: 8990 // [...] A virtual member function is used if it is not pure. [...] 8991 if (MD->isVirtual() && !MD->isPure()) 8992 MarkDeclarationReferenced(Loc, MD); 8993 } 8994 8995 // Only classes that have virtual bases need a VTT. 8996 if (RD->getNumVBases() == 0) 8997 return; 8998 8999 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9000 e = RD->bases_end(); i != e; ++i) { 9001 const CXXRecordDecl *Base = 9002 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9003 if (Base->getNumVBases() == 0) 9004 continue; 9005 MarkVirtualMembersReferenced(Loc, Base); 9006 } 9007} 9008 9009/// SetIvarInitializers - This routine builds initialization ASTs for the 9010/// Objective-C implementation whose ivars need be initialized. 9011void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9012 if (!getLangOptions().CPlusPlus) 9013 return; 9014 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9015 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9016 CollectIvarsToConstructOrDestruct(OID, ivars); 9017 if (ivars.empty()) 9018 return; 9019 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9020 for (unsigned i = 0; i < ivars.size(); i++) { 9021 FieldDecl *Field = ivars[i]; 9022 if (Field->isInvalidDecl()) 9023 continue; 9024 9025 CXXCtorInitializer *Member; 9026 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9027 InitializationKind InitKind = 9028 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9029 9030 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9031 ExprResult MemberInit = 9032 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9033 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9034 // Note, MemberInit could actually come back empty if no initialization 9035 // is required (e.g., because it would call a trivial default constructor) 9036 if (!MemberInit.get() || MemberInit.isInvalid()) 9037 continue; 9038 9039 Member = 9040 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9041 SourceLocation(), 9042 MemberInit.takeAs<Expr>(), 9043 SourceLocation()); 9044 AllToInit.push_back(Member); 9045 9046 // Be sure that the destructor is accessible and is marked as referenced. 9047 if (const RecordType *RecordTy 9048 = Context.getBaseElementType(Field->getType()) 9049 ->getAs<RecordType>()) { 9050 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9051 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9052 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9053 CheckDestructorAccess(Field->getLocation(), Destructor, 9054 PDiag(diag::err_access_dtor_ivar) 9055 << Context.getBaseElementType(Field->getType())); 9056 } 9057 } 9058 } 9059 ObjCImplementation->setIvarInitializers(Context, 9060 AllToInit.data(), AllToInit.size()); 9061 } 9062} 9063 9064static 9065void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9066 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9067 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9068 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9069 Sema &S) { 9070 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9071 CE = Current.end(); 9072 if (Ctor->isInvalidDecl()) 9073 return; 9074 9075 const FunctionDecl *FNTarget = 0; 9076 CXXConstructorDecl *Target; 9077 9078 // We ignore the result here since if we don't have a body, Target will be 9079 // null below. 9080 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9081 Target 9082= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9083 9084 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9085 // Avoid dereferencing a null pointer here. 9086 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9087 9088 if (!Current.insert(Canonical)) 9089 return; 9090 9091 // We know that beyond here, we aren't chaining into a cycle. 9092 if (!Target || !Target->isDelegatingConstructor() || 9093 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9094 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9095 Valid.insert(*CI); 9096 Current.clear(); 9097 // We've hit a cycle. 9098 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9099 Current.count(TCanonical)) { 9100 // If we haven't diagnosed this cycle yet, do so now. 9101 if (!Invalid.count(TCanonical)) { 9102 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9103 diag::warn_delegating_ctor_cycle) 9104 << Ctor; 9105 9106 // Don't add a note for a function delegating directo to itself. 9107 if (TCanonical != Canonical) 9108 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9109 9110 CXXConstructorDecl *C = Target; 9111 while (C->getCanonicalDecl() != Canonical) { 9112 (void)C->getTargetConstructor()->hasBody(FNTarget); 9113 assert(FNTarget && "Ctor cycle through bodiless function"); 9114 9115 C 9116 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9117 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9118 } 9119 } 9120 9121 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9122 Invalid.insert(*CI); 9123 Current.clear(); 9124 } else { 9125 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9126 } 9127} 9128 9129 9130void Sema::CheckDelegatingCtorCycles() { 9131 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9132 9133 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9134 CE = Current.end(); 9135 9136 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9137 I = DelegatingCtorDecls.begin(), 9138 E = DelegatingCtorDecls.end(); 9139 I != E; ++I) { 9140 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9141 } 9142 9143 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9144 (*CI)->setInvalidDecl(); 9145} 9146