SemaDeclCXX.cpp revision 1d78032167c2f2d470e4270aadcb07ff71e6c7e1
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // If this function has a basic noexcept, it doesn't affect the outcome. 133 if (EST == EST_BasicNoexcept) 134 return; 135 136 // If we have a throw-all spec at this point, ignore the function. 137 if (ComputedEST == EST_None) 138 return; 139 140 // If we're still at noexcept(true) and there's a nothrow() callee, 141 // change to that specification. 142 if (EST == EST_DynamicNone) { 143 if (ComputedEST == EST_BasicNoexcept) 144 ComputedEST = EST_DynamicNone; 145 return; 146 } 147 148 // Check out noexcept specs. 149 if (EST == EST_ComputedNoexcept) { 150 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 151 assert(NR != FunctionProtoType::NR_NoNoexcept && 152 "Must have noexcept result for EST_ComputedNoexcept."); 153 assert(NR != FunctionProtoType::NR_Dependent && 154 "Should not generate implicit declarations for dependent cases, " 155 "and don't know how to handle them anyway."); 156 157 // noexcept(false) -> no spec on the new function 158 if (NR == FunctionProtoType::NR_Throw) { 159 ClearExceptions(); 160 ComputedEST = EST_None; 161 } 162 // noexcept(true) won't change anything either. 163 return; 164 } 165 166 assert(EST == EST_Dynamic && "EST case not considered earlier."); 167 assert(ComputedEST != EST_None && 168 "Shouldn't collect exceptions when throw-all is guaranteed."); 169 ComputedEST = EST_Dynamic; 170 // Record the exceptions in this function's exception specification. 171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 172 EEnd = Proto->exception_end(); 173 E != EEnd; ++E) 174 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 175 Exceptions.push_back(*E); 176} 177 178bool 179Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 180 SourceLocation EqualLoc) { 181 if (RequireCompleteType(Param->getLocation(), Param->getType(), 182 diag::err_typecheck_decl_incomplete_type)) { 183 Param->setInvalidDecl(); 184 return true; 185 } 186 187 // C++ [dcl.fct.default]p5 188 // A default argument expression is implicitly converted (clause 189 // 4) to the parameter type. The default argument expression has 190 // the same semantic constraints as the initializer expression in 191 // a declaration of a variable of the parameter type, using the 192 // copy-initialization semantics (8.5). 193 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 194 Param); 195 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 196 EqualLoc); 197 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 198 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 199 MultiExprArg(*this, &Arg, 1)); 200 if (Result.isInvalid()) 201 return true; 202 Arg = Result.takeAs<Expr>(); 203 204 CheckImplicitConversions(Arg, EqualLoc); 205 Arg = MaybeCreateExprWithCleanups(Arg); 206 207 // Okay: add the default argument to the parameter 208 Param->setDefaultArg(Arg); 209 210 // We have already instantiated this parameter; provide each of the 211 // instantiations with the uninstantiated default argument. 212 UnparsedDefaultArgInstantiationsMap::iterator InstPos 213 = UnparsedDefaultArgInstantiations.find(Param); 214 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 215 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 216 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 217 218 // We're done tracking this parameter's instantiations. 219 UnparsedDefaultArgInstantiations.erase(InstPos); 220 } 221 222 return false; 223} 224 225/// ActOnParamDefaultArgument - Check whether the default argument 226/// provided for a function parameter is well-formed. If so, attach it 227/// to the parameter declaration. 228void 229Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 230 Expr *DefaultArg) { 231 if (!param || !DefaultArg) 232 return; 233 234 ParmVarDecl *Param = cast<ParmVarDecl>(param); 235 UnparsedDefaultArgLocs.erase(Param); 236 237 // Default arguments are only permitted in C++ 238 if (!getLangOptions().CPlusPlus) { 239 Diag(EqualLoc, diag::err_param_default_argument) 240 << DefaultArg->getSourceRange(); 241 Param->setInvalidDecl(); 242 return; 243 } 244 245 // Check for unexpanded parameter packs. 246 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 247 Param->setInvalidDecl(); 248 return; 249 } 250 251 // Check that the default argument is well-formed 252 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 253 if (DefaultArgChecker.Visit(DefaultArg)) { 254 Param->setInvalidDecl(); 255 return; 256 } 257 258 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 259} 260 261/// ActOnParamUnparsedDefaultArgument - We've seen a default 262/// argument for a function parameter, but we can't parse it yet 263/// because we're inside a class definition. Note that this default 264/// argument will be parsed later. 265void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 266 SourceLocation EqualLoc, 267 SourceLocation ArgLoc) { 268 if (!param) 269 return; 270 271 ParmVarDecl *Param = cast<ParmVarDecl>(param); 272 if (Param) 273 Param->setUnparsedDefaultArg(); 274 275 UnparsedDefaultArgLocs[Param] = ArgLoc; 276} 277 278/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 279/// the default argument for the parameter param failed. 280void Sema::ActOnParamDefaultArgumentError(Decl *param) { 281 if (!param) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 286 Param->setInvalidDecl(); 287 288 UnparsedDefaultArgLocs.erase(Param); 289} 290 291/// CheckExtraCXXDefaultArguments - Check for any extra default 292/// arguments in the declarator, which is not a function declaration 293/// or definition and therefore is not permitted to have default 294/// arguments. This routine should be invoked for every declarator 295/// that is not a function declaration or definition. 296void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 297 // C++ [dcl.fct.default]p3 298 // A default argument expression shall be specified only in the 299 // parameter-declaration-clause of a function declaration or in a 300 // template-parameter (14.1). It shall not be specified for a 301 // parameter pack. If it is specified in a 302 // parameter-declaration-clause, it shall not occur within a 303 // declarator or abstract-declarator of a parameter-declaration. 304 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 305 DeclaratorChunk &chunk = D.getTypeObject(i); 306 if (chunk.Kind == DeclaratorChunk::Function) { 307 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 308 ParmVarDecl *Param = 309 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 310 if (Param->hasUnparsedDefaultArg()) { 311 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 312 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 313 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 314 delete Toks; 315 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 316 } else if (Param->getDefaultArg()) { 317 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 318 << Param->getDefaultArg()->getSourceRange(); 319 Param->setDefaultArg(0); 320 } 321 } 322 } 323 } 324} 325 326// MergeCXXFunctionDecl - Merge two declarations of the same C++ 327// function, once we already know that they have the same 328// type. Subroutine of MergeFunctionDecl. Returns true if there was an 329// error, false otherwise. 330bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 331 bool Invalid = false; 332 333 // C++ [dcl.fct.default]p4: 334 // For non-template functions, default arguments can be added in 335 // later declarations of a function in the same 336 // scope. Declarations in different scopes have completely 337 // distinct sets of default arguments. That is, declarations in 338 // inner scopes do not acquire default arguments from 339 // declarations in outer scopes, and vice versa. In a given 340 // function declaration, all parameters subsequent to a 341 // parameter with a default argument shall have default 342 // arguments supplied in this or previous declarations. A 343 // default argument shall not be redefined by a later 344 // declaration (not even to the same value). 345 // 346 // C++ [dcl.fct.default]p6: 347 // Except for member functions of class templates, the default arguments 348 // in a member function definition that appears outside of the class 349 // definition are added to the set of default arguments provided by the 350 // member function declaration in the class definition. 351 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 352 ParmVarDecl *OldParam = Old->getParamDecl(p); 353 ParmVarDecl *NewParam = New->getParamDecl(p); 354 355 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 356 357 unsigned DiagDefaultParamID = 358 diag::err_param_default_argument_redefinition; 359 360 // MSVC accepts that default parameters be redefined for member functions 361 // of template class. The new default parameter's value is ignored. 362 Invalid = true; 363 if (getLangOptions().Microsoft) { 364 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 365 if (MD && MD->getParent()->getDescribedClassTemplate()) { 366 // Merge the old default argument into the new parameter. 367 NewParam->setHasInheritedDefaultArg(); 368 if (OldParam->hasUninstantiatedDefaultArg()) 369 NewParam->setUninstantiatedDefaultArg( 370 OldParam->getUninstantiatedDefaultArg()); 371 else 372 NewParam->setDefaultArg(OldParam->getInit()); 373 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 374 Invalid = false; 375 } 376 } 377 378 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 379 // hint here. Alternatively, we could walk the type-source information 380 // for NewParam to find the last source location in the type... but it 381 // isn't worth the effort right now. This is the kind of test case that 382 // is hard to get right: 383 // int f(int); 384 // void g(int (*fp)(int) = f); 385 // void g(int (*fp)(int) = &f); 386 Diag(NewParam->getLocation(), DiagDefaultParamID) 387 << NewParam->getDefaultArgRange(); 388 389 // Look for the function declaration where the default argument was 390 // actually written, which may be a declaration prior to Old. 391 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 392 Older; Older = Older->getPreviousDeclaration()) { 393 if (!Older->getParamDecl(p)->hasDefaultArg()) 394 break; 395 396 OldParam = Older->getParamDecl(p); 397 } 398 399 Diag(OldParam->getLocation(), diag::note_previous_definition) 400 << OldParam->getDefaultArgRange(); 401 } else if (OldParam->hasDefaultArg()) { 402 // Merge the old default argument into the new parameter. 403 // It's important to use getInit() here; getDefaultArg() 404 // strips off any top-level ExprWithCleanups. 405 NewParam->setHasInheritedDefaultArg(); 406 if (OldParam->hasUninstantiatedDefaultArg()) 407 NewParam->setUninstantiatedDefaultArg( 408 OldParam->getUninstantiatedDefaultArg()); 409 else 410 NewParam->setDefaultArg(OldParam->getInit()); 411 } else if (NewParam->hasDefaultArg()) { 412 if (New->getDescribedFunctionTemplate()) { 413 // Paragraph 4, quoted above, only applies to non-template functions. 414 Diag(NewParam->getLocation(), 415 diag::err_param_default_argument_template_redecl) 416 << NewParam->getDefaultArgRange(); 417 Diag(Old->getLocation(), diag::note_template_prev_declaration) 418 << false; 419 } else if (New->getTemplateSpecializationKind() 420 != TSK_ImplicitInstantiation && 421 New->getTemplateSpecializationKind() != TSK_Undeclared) { 422 // C++ [temp.expr.spec]p21: 423 // Default function arguments shall not be specified in a declaration 424 // or a definition for one of the following explicit specializations: 425 // - the explicit specialization of a function template; 426 // - the explicit specialization of a member function template; 427 // - the explicit specialization of a member function of a class 428 // template where the class template specialization to which the 429 // member function specialization belongs is implicitly 430 // instantiated. 431 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 432 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 433 << New->getDeclName() 434 << NewParam->getDefaultArgRange(); 435 } else if (New->getDeclContext()->isDependentContext()) { 436 // C++ [dcl.fct.default]p6 (DR217): 437 // Default arguments for a member function of a class template shall 438 // be specified on the initial declaration of the member function 439 // within the class template. 440 // 441 // Reading the tea leaves a bit in DR217 and its reference to DR205 442 // leads me to the conclusion that one cannot add default function 443 // arguments for an out-of-line definition of a member function of a 444 // dependent type. 445 int WhichKind = 2; 446 if (CXXRecordDecl *Record 447 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 448 if (Record->getDescribedClassTemplate()) 449 WhichKind = 0; 450 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 451 WhichKind = 1; 452 else 453 WhichKind = 2; 454 } 455 456 Diag(NewParam->getLocation(), 457 diag::err_param_default_argument_member_template_redecl) 458 << WhichKind 459 << NewParam->getDefaultArgRange(); 460 } 461 } 462 } 463 464 if (CheckEquivalentExceptionSpec(Old, New)) 465 Invalid = true; 466 467 return Invalid; 468} 469 470/// \brief Merge the exception specifications of two variable declarations. 471/// 472/// This is called when there's a redeclaration of a VarDecl. The function 473/// checks if the redeclaration might have an exception specification and 474/// validates compatibility and merges the specs if necessary. 475void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 476 // Shortcut if exceptions are disabled. 477 if (!getLangOptions().CXXExceptions) 478 return; 479 480 assert(Context.hasSameType(New->getType(), Old->getType()) && 481 "Should only be called if types are otherwise the same."); 482 483 QualType NewType = New->getType(); 484 QualType OldType = Old->getType(); 485 486 // We're only interested in pointers and references to functions, as well 487 // as pointers to member functions. 488 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 489 NewType = R->getPointeeType(); 490 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 491 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 492 NewType = P->getPointeeType(); 493 OldType = OldType->getAs<PointerType>()->getPointeeType(); 494 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 495 NewType = M->getPointeeType(); 496 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 497 } 498 499 if (!NewType->isFunctionProtoType()) 500 return; 501 502 // There's lots of special cases for functions. For function pointers, system 503 // libraries are hopefully not as broken so that we don't need these 504 // workarounds. 505 if (CheckEquivalentExceptionSpec( 506 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 507 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 508 New->setInvalidDecl(); 509 } 510} 511 512/// CheckCXXDefaultArguments - Verify that the default arguments for a 513/// function declaration are well-formed according to C++ 514/// [dcl.fct.default]. 515void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 516 unsigned NumParams = FD->getNumParams(); 517 unsigned p; 518 519 // Find first parameter with a default argument 520 for (p = 0; p < NumParams; ++p) { 521 ParmVarDecl *Param = FD->getParamDecl(p); 522 if (Param->hasDefaultArg()) 523 break; 524 } 525 526 // C++ [dcl.fct.default]p4: 527 // In a given function declaration, all parameters 528 // subsequent to a parameter with a default argument shall 529 // have default arguments supplied in this or previous 530 // declarations. A default argument shall not be redefined 531 // by a later declaration (not even to the same value). 532 unsigned LastMissingDefaultArg = 0; 533 for (; p < NumParams; ++p) { 534 ParmVarDecl *Param = FD->getParamDecl(p); 535 if (!Param->hasDefaultArg()) { 536 if (Param->isInvalidDecl()) 537 /* We already complained about this parameter. */; 538 else if (Param->getIdentifier()) 539 Diag(Param->getLocation(), 540 diag::err_param_default_argument_missing_name) 541 << Param->getIdentifier(); 542 else 543 Diag(Param->getLocation(), 544 diag::err_param_default_argument_missing); 545 546 LastMissingDefaultArg = p; 547 } 548 } 549 550 if (LastMissingDefaultArg > 0) { 551 // Some default arguments were missing. Clear out all of the 552 // default arguments up to (and including) the last missing 553 // default argument, so that we leave the function parameters 554 // in a semantically valid state. 555 for (p = 0; p <= LastMissingDefaultArg; ++p) { 556 ParmVarDecl *Param = FD->getParamDecl(p); 557 if (Param->hasDefaultArg()) { 558 Param->setDefaultArg(0); 559 } 560 } 561 } 562} 563 564/// isCurrentClassName - Determine whether the identifier II is the 565/// name of the class type currently being defined. In the case of 566/// nested classes, this will only return true if II is the name of 567/// the innermost class. 568bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 569 const CXXScopeSpec *SS) { 570 assert(getLangOptions().CPlusPlus && "No class names in C!"); 571 572 CXXRecordDecl *CurDecl; 573 if (SS && SS->isSet() && !SS->isInvalid()) { 574 DeclContext *DC = computeDeclContext(*SS, true); 575 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 576 } else 577 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 578 579 if (CurDecl && CurDecl->getIdentifier()) 580 return &II == CurDecl->getIdentifier(); 581 else 582 return false; 583} 584 585/// \brief Check the validity of a C++ base class specifier. 586/// 587/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 588/// and returns NULL otherwise. 589CXXBaseSpecifier * 590Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 591 SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeSourceInfo *TInfo, 594 SourceLocation EllipsisLoc) { 595 QualType BaseType = TInfo->getType(); 596 597 // C++ [class.union]p1: 598 // A union shall not have base classes. 599 if (Class->isUnion()) { 600 Diag(Class->getLocation(), diag::err_base_clause_on_union) 601 << SpecifierRange; 602 return 0; 603 } 604 605 if (EllipsisLoc.isValid() && 606 !TInfo->getType()->containsUnexpandedParameterPack()) { 607 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 608 << TInfo->getTypeLoc().getSourceRange(); 609 EllipsisLoc = SourceLocation(); 610 } 611 612 if (BaseType->isDependentType()) 613 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 614 Class->getTagKind() == TTK_Class, 615 Access, TInfo, EllipsisLoc); 616 617 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 618 619 // Base specifiers must be record types. 620 if (!BaseType->isRecordType()) { 621 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 622 return 0; 623 } 624 625 // C++ [class.union]p1: 626 // A union shall not be used as a base class. 627 if (BaseType->isUnionType()) { 628 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 629 return 0; 630 } 631 632 // C++ [class.derived]p2: 633 // The class-name in a base-specifier shall not be an incompletely 634 // defined class. 635 if (RequireCompleteType(BaseLoc, BaseType, 636 PDiag(diag::err_incomplete_base_class) 637 << SpecifierRange)) { 638 Class->setInvalidDecl(); 639 return 0; 640 } 641 642 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 643 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 644 assert(BaseDecl && "Record type has no declaration"); 645 BaseDecl = BaseDecl->getDefinition(); 646 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 647 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 648 assert(CXXBaseDecl && "Base type is not a C++ type"); 649 650 // C++ [class]p3: 651 // If a class is marked final and it appears as a base-type-specifier in 652 // base-clause, the program is ill-formed. 653 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 654 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 655 << CXXBaseDecl->getDeclName(); 656 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 657 << CXXBaseDecl->getDeclName(); 658 return 0; 659 } 660 661 if (BaseDecl->isInvalidDecl()) 662 Class->setInvalidDecl(); 663 664 // Create the base specifier. 665 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 666 Class->getTagKind() == TTK_Class, 667 Access, TInfo, EllipsisLoc); 668} 669 670/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 671/// one entry in the base class list of a class specifier, for 672/// example: 673/// class foo : public bar, virtual private baz { 674/// 'public bar' and 'virtual private baz' are each base-specifiers. 675BaseResult 676Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 677 bool Virtual, AccessSpecifier Access, 678 ParsedType basetype, SourceLocation BaseLoc, 679 SourceLocation EllipsisLoc) { 680 if (!classdecl) 681 return true; 682 683 AdjustDeclIfTemplate(classdecl); 684 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 685 if (!Class) 686 return true; 687 688 TypeSourceInfo *TInfo = 0; 689 GetTypeFromParser(basetype, &TInfo); 690 691 if (EllipsisLoc.isInvalid() && 692 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 693 UPPC_BaseType)) 694 return true; 695 696 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 697 Virtual, Access, TInfo, 698 EllipsisLoc)) 699 return BaseSpec; 700 701 return true; 702} 703 704/// \brief Performs the actual work of attaching the given base class 705/// specifiers to a C++ class. 706bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 707 unsigned NumBases) { 708 if (NumBases == 0) 709 return false; 710 711 // Used to keep track of which base types we have already seen, so 712 // that we can properly diagnose redundant direct base types. Note 713 // that the key is always the unqualified canonical type of the base 714 // class. 715 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 716 717 // Copy non-redundant base specifiers into permanent storage. 718 unsigned NumGoodBases = 0; 719 bool Invalid = false; 720 for (unsigned idx = 0; idx < NumBases; ++idx) { 721 QualType NewBaseType 722 = Context.getCanonicalType(Bases[idx]->getType()); 723 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 724 if (!Class->hasObjectMember()) { 725 if (const RecordType *FDTTy = 726 NewBaseType.getTypePtr()->getAs<RecordType>()) 727 if (FDTTy->getDecl()->hasObjectMember()) 728 Class->setHasObjectMember(true); 729 } 730 731 if (KnownBaseTypes[NewBaseType]) { 732 // C++ [class.mi]p3: 733 // A class shall not be specified as a direct base class of a 734 // derived class more than once. 735 Diag(Bases[idx]->getSourceRange().getBegin(), 736 diag::err_duplicate_base_class) 737 << KnownBaseTypes[NewBaseType]->getType() 738 << Bases[idx]->getSourceRange(); 739 740 // Delete the duplicate base class specifier; we're going to 741 // overwrite its pointer later. 742 Context.Deallocate(Bases[idx]); 743 744 Invalid = true; 745 } else { 746 // Okay, add this new base class. 747 KnownBaseTypes[NewBaseType] = Bases[idx]; 748 Bases[NumGoodBases++] = Bases[idx]; 749 } 750 } 751 752 // Attach the remaining base class specifiers to the derived class. 753 Class->setBases(Bases, NumGoodBases); 754 755 // Delete the remaining (good) base class specifiers, since their 756 // data has been copied into the CXXRecordDecl. 757 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 758 Context.Deallocate(Bases[idx]); 759 760 return Invalid; 761} 762 763/// ActOnBaseSpecifiers - Attach the given base specifiers to the 764/// class, after checking whether there are any duplicate base 765/// classes. 766void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 767 unsigned NumBases) { 768 if (!ClassDecl || !Bases || !NumBases) 769 return; 770 771 AdjustDeclIfTemplate(ClassDecl); 772 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 773 (CXXBaseSpecifier**)(Bases), NumBases); 774} 775 776static CXXRecordDecl *GetClassForType(QualType T) { 777 if (const RecordType *RT = T->getAs<RecordType>()) 778 return cast<CXXRecordDecl>(RT->getDecl()); 779 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 780 return ICT->getDecl(); 781 else 782 return 0; 783} 784 785/// \brief Determine whether the type \p Derived is a C++ class that is 786/// derived from the type \p Base. 787bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 788 if (!getLangOptions().CPlusPlus) 789 return false; 790 791 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 792 if (!DerivedRD) 793 return false; 794 795 CXXRecordDecl *BaseRD = GetClassForType(Base); 796 if (!BaseRD) 797 return false; 798 799 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 800 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 801} 802 803/// \brief Determine whether the type \p Derived is a C++ class that is 804/// derived from the type \p Base. 805bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 810 if (!DerivedRD) 811 return false; 812 813 CXXRecordDecl *BaseRD = GetClassForType(Base); 814 if (!BaseRD) 815 return false; 816 817 return DerivedRD->isDerivedFrom(BaseRD, Paths); 818} 819 820void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 821 CXXCastPath &BasePathArray) { 822 assert(BasePathArray.empty() && "Base path array must be empty!"); 823 assert(Paths.isRecordingPaths() && "Must record paths!"); 824 825 const CXXBasePath &Path = Paths.front(); 826 827 // We first go backward and check if we have a virtual base. 828 // FIXME: It would be better if CXXBasePath had the base specifier for 829 // the nearest virtual base. 830 unsigned Start = 0; 831 for (unsigned I = Path.size(); I != 0; --I) { 832 if (Path[I - 1].Base->isVirtual()) { 833 Start = I - 1; 834 break; 835 } 836 } 837 838 // Now add all bases. 839 for (unsigned I = Start, E = Path.size(); I != E; ++I) 840 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 841} 842 843/// \brief Determine whether the given base path includes a virtual 844/// base class. 845bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 846 for (CXXCastPath::const_iterator B = BasePath.begin(), 847 BEnd = BasePath.end(); 848 B != BEnd; ++B) 849 if ((*B)->isVirtual()) 850 return true; 851 852 return false; 853} 854 855/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 856/// conversion (where Derived and Base are class types) is 857/// well-formed, meaning that the conversion is unambiguous (and 858/// that all of the base classes are accessible). Returns true 859/// and emits a diagnostic if the code is ill-formed, returns false 860/// otherwise. Loc is the location where this routine should point to 861/// if there is an error, and Range is the source range to highlight 862/// if there is an error. 863bool 864Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 865 unsigned InaccessibleBaseID, 866 unsigned AmbigiousBaseConvID, 867 SourceLocation Loc, SourceRange Range, 868 DeclarationName Name, 869 CXXCastPath *BasePath) { 870 // First, determine whether the path from Derived to Base is 871 // ambiguous. This is slightly more expensive than checking whether 872 // the Derived to Base conversion exists, because here we need to 873 // explore multiple paths to determine if there is an ambiguity. 874 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 875 /*DetectVirtual=*/false); 876 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 877 assert(DerivationOkay && 878 "Can only be used with a derived-to-base conversion"); 879 (void)DerivationOkay; 880 881 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 882 if (InaccessibleBaseID) { 883 // Check that the base class can be accessed. 884 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 885 InaccessibleBaseID)) { 886 case AR_inaccessible: 887 return true; 888 case AR_accessible: 889 case AR_dependent: 890 case AR_delayed: 891 break; 892 } 893 } 894 895 // Build a base path if necessary. 896 if (BasePath) 897 BuildBasePathArray(Paths, *BasePath); 898 return false; 899 } 900 901 // We know that the derived-to-base conversion is ambiguous, and 902 // we're going to produce a diagnostic. Perform the derived-to-base 903 // search just one more time to compute all of the possible paths so 904 // that we can print them out. This is more expensive than any of 905 // the previous derived-to-base checks we've done, but at this point 906 // performance isn't as much of an issue. 907 Paths.clear(); 908 Paths.setRecordingPaths(true); 909 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 910 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 911 (void)StillOkay; 912 913 // Build up a textual representation of the ambiguous paths, e.g., 914 // D -> B -> A, that will be used to illustrate the ambiguous 915 // conversions in the diagnostic. We only print one of the paths 916 // to each base class subobject. 917 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 918 919 Diag(Loc, AmbigiousBaseConvID) 920 << Derived << Base << PathDisplayStr << Range << Name; 921 return true; 922} 923 924bool 925Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 926 SourceLocation Loc, SourceRange Range, 927 CXXCastPath *BasePath, 928 bool IgnoreAccess) { 929 return CheckDerivedToBaseConversion(Derived, Base, 930 IgnoreAccess ? 0 931 : diag::err_upcast_to_inaccessible_base, 932 diag::err_ambiguous_derived_to_base_conv, 933 Loc, Range, DeclarationName(), 934 BasePath); 935} 936 937 938/// @brief Builds a string representing ambiguous paths from a 939/// specific derived class to different subobjects of the same base 940/// class. 941/// 942/// This function builds a string that can be used in error messages 943/// to show the different paths that one can take through the 944/// inheritance hierarchy to go from the derived class to different 945/// subobjects of a base class. The result looks something like this: 946/// @code 947/// struct D -> struct B -> struct A 948/// struct D -> struct C -> struct A 949/// @endcode 950std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 951 std::string PathDisplayStr; 952 std::set<unsigned> DisplayedPaths; 953 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 954 Path != Paths.end(); ++Path) { 955 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 956 // We haven't displayed a path to this particular base 957 // class subobject yet. 958 PathDisplayStr += "\n "; 959 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 960 for (CXXBasePath::const_iterator Element = Path->begin(); 961 Element != Path->end(); ++Element) 962 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 963 } 964 } 965 966 return PathDisplayStr; 967} 968 969//===----------------------------------------------------------------------===// 970// C++ class member Handling 971//===----------------------------------------------------------------------===// 972 973/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 974Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 975 SourceLocation ASLoc, 976 SourceLocation ColonLoc) { 977 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 978 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 979 ASLoc, ColonLoc); 980 CurContext->addHiddenDecl(ASDecl); 981 return ASDecl; 982} 983 984/// CheckOverrideControl - Check C++0x override control semantics. 985void Sema::CheckOverrideControl(const Decl *D) { 986 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 987 if (!MD || !MD->isVirtual()) 988 return; 989 990 if (MD->isDependentContext()) 991 return; 992 993 // C++0x [class.virtual]p3: 994 // If a virtual function is marked with the virt-specifier override and does 995 // not override a member function of a base class, 996 // the program is ill-formed. 997 bool HasOverriddenMethods = 998 MD->begin_overridden_methods() != MD->end_overridden_methods(); 999 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1000 Diag(MD->getLocation(), 1001 diag::err_function_marked_override_not_overriding) 1002 << MD->getDeclName(); 1003 return; 1004 } 1005} 1006 1007/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1008/// function overrides a virtual member function marked 'final', according to 1009/// C++0x [class.virtual]p3. 1010bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1011 const CXXMethodDecl *Old) { 1012 if (!Old->hasAttr<FinalAttr>()) 1013 return false; 1014 1015 Diag(New->getLocation(), diag::err_final_function_overridden) 1016 << New->getDeclName(); 1017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1018 return true; 1019} 1020 1021/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1022/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1023/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1024/// any. 1025Decl * 1026Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1027 MultiTemplateParamsArg TemplateParameterLists, 1028 ExprTy *BW, const VirtSpecifiers &VS, 1029 ExprTy *InitExpr, bool IsDefinition) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (SS.isSet() && !SS.isInvalid()) { 1095 // The user provided a superfluous scope specifier inside a class 1096 // definition: 1097 // 1098 // class X { 1099 // int X::member; 1100 // }; 1101 DeclContext *DC = 0; 1102 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1103 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1104 << Name << FixItHint::CreateRemoval(SS.getRange()); 1105 else 1106 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1107 << Name << SS.getRange(); 1108 1109 SS.clear(); 1110 } 1111 1112 // FIXME: Check for template parameters! 1113 // FIXME: Check that the name is an identifier! 1114 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1115 AS); 1116 assert(Member && "HandleField never returns null"); 1117 } else { 1118 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1119 if (!Member) { 1120 return 0; 1121 } 1122 1123 // Non-instance-fields can't have a bitfield. 1124 if (BitWidth) { 1125 if (Member->isInvalidDecl()) { 1126 // don't emit another diagnostic. 1127 } else if (isa<VarDecl>(Member)) { 1128 // C++ 9.6p3: A bit-field shall not be a static member. 1129 // "static member 'A' cannot be a bit-field" 1130 Diag(Loc, diag::err_static_not_bitfield) 1131 << Name << BitWidth->getSourceRange(); 1132 } else if (isa<TypedefDecl>(Member)) { 1133 // "typedef member 'x' cannot be a bit-field" 1134 Diag(Loc, diag::err_typedef_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else { 1137 // A function typedef ("typedef int f(); f a;"). 1138 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1139 Diag(Loc, diag::err_not_integral_type_bitfield) 1140 << Name << cast<ValueDecl>(Member)->getType() 1141 << BitWidth->getSourceRange(); 1142 } 1143 1144 BitWidth = 0; 1145 Member->setInvalidDecl(); 1146 } 1147 1148 Member->setAccess(AS); 1149 1150 // If we have declared a member function template, set the access of the 1151 // templated declaration as well. 1152 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1153 FunTmpl->getTemplatedDecl()->setAccess(AS); 1154 } 1155 1156 if (VS.isOverrideSpecified()) { 1157 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1158 if (!MD || !MD->isVirtual()) { 1159 Diag(Member->getLocStart(), 1160 diag::override_keyword_only_allowed_on_virtual_member_functions) 1161 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1162 } else 1163 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1164 } 1165 if (VS.isFinalSpecified()) { 1166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1167 if (!MD || !MD->isVirtual()) { 1168 Diag(Member->getLocStart(), 1169 diag::override_keyword_only_allowed_on_virtual_member_functions) 1170 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1171 } else 1172 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1173 } 1174 1175 if (VS.getLastLocation().isValid()) { 1176 // Update the end location of a method that has a virt-specifiers. 1177 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1178 MD->setRangeEnd(VS.getLastLocation()); 1179 } 1180 1181 CheckOverrideControl(Member); 1182 1183 assert((Name || isInstField) && "No identifier for non-field ?"); 1184 1185 if (Init) 1186 AddInitializerToDecl(Member, Init, false, 1187 DS.getTypeSpecType() == DeclSpec::TST_auto); 1188 1189 FinalizeDeclaration(Member); 1190 1191 if (isInstField) 1192 FieldCollector->Add(cast<FieldDecl>(Member)); 1193 return Member; 1194} 1195 1196/// \brief Find the direct and/or virtual base specifiers that 1197/// correspond to the given base type, for use in base initialization 1198/// within a constructor. 1199static bool FindBaseInitializer(Sema &SemaRef, 1200 CXXRecordDecl *ClassDecl, 1201 QualType BaseType, 1202 const CXXBaseSpecifier *&DirectBaseSpec, 1203 const CXXBaseSpecifier *&VirtualBaseSpec) { 1204 // First, check for a direct base class. 1205 DirectBaseSpec = 0; 1206 for (CXXRecordDecl::base_class_const_iterator Base 1207 = ClassDecl->bases_begin(); 1208 Base != ClassDecl->bases_end(); ++Base) { 1209 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1210 // We found a direct base of this type. That's what we're 1211 // initializing. 1212 DirectBaseSpec = &*Base; 1213 break; 1214 } 1215 } 1216 1217 // Check for a virtual base class. 1218 // FIXME: We might be able to short-circuit this if we know in advance that 1219 // there are no virtual bases. 1220 VirtualBaseSpec = 0; 1221 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1222 // We haven't found a base yet; search the class hierarchy for a 1223 // virtual base class. 1224 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1225 /*DetectVirtual=*/false); 1226 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1227 BaseType, Paths)) { 1228 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1229 Path != Paths.end(); ++Path) { 1230 if (Path->back().Base->isVirtual()) { 1231 VirtualBaseSpec = Path->back().Base; 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 1238 return DirectBaseSpec || VirtualBaseSpec; 1239} 1240 1241/// ActOnMemInitializer - Handle a C++ member initializer. 1242MemInitResult 1243Sema::ActOnMemInitializer(Decl *ConstructorD, 1244 Scope *S, 1245 CXXScopeSpec &SS, 1246 IdentifierInfo *MemberOrBase, 1247 ParsedType TemplateTypeTy, 1248 SourceLocation IdLoc, 1249 SourceLocation LParenLoc, 1250 ExprTy **Args, unsigned NumArgs, 1251 SourceLocation RParenLoc, 1252 SourceLocation EllipsisLoc) { 1253 if (!ConstructorD) 1254 return true; 1255 1256 AdjustDeclIfTemplate(ConstructorD); 1257 1258 CXXConstructorDecl *Constructor 1259 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1260 if (!Constructor) { 1261 // The user wrote a constructor initializer on a function that is 1262 // not a C++ constructor. Ignore the error for now, because we may 1263 // have more member initializers coming; we'll diagnose it just 1264 // once in ActOnMemInitializers. 1265 return true; 1266 } 1267 1268 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1269 1270 // C++ [class.base.init]p2: 1271 // Names in a mem-initializer-id are looked up in the scope of the 1272 // constructor's class and, if not found in that scope, are looked 1273 // up in the scope containing the constructor's definition. 1274 // [Note: if the constructor's class contains a member with the 1275 // same name as a direct or virtual base class of the class, a 1276 // mem-initializer-id naming the member or base class and composed 1277 // of a single identifier refers to the class member. A 1278 // mem-initializer-id for the hidden base class may be specified 1279 // using a qualified name. ] 1280 if (!SS.getScopeRep() && !TemplateTypeTy) { 1281 // Look for a member, first. 1282 FieldDecl *Member = 0; 1283 DeclContext::lookup_result Result 1284 = ClassDecl->lookup(MemberOrBase); 1285 if (Result.first != Result.second) { 1286 Member = dyn_cast<FieldDecl>(*Result.first); 1287 1288 if (Member) { 1289 if (EllipsisLoc.isValid()) 1290 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1291 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1292 1293 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1294 LParenLoc, RParenLoc); 1295 } 1296 1297 // Handle anonymous union case. 1298 if (IndirectFieldDecl* IndirectField 1299 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1300 if (EllipsisLoc.isValid()) 1301 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1302 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1303 1304 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1305 NumArgs, IdLoc, 1306 LParenLoc, RParenLoc); 1307 } 1308 } 1309 } 1310 // It didn't name a member, so see if it names a class. 1311 QualType BaseType; 1312 TypeSourceInfo *TInfo = 0; 1313 1314 if (TemplateTypeTy) { 1315 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1316 } else { 1317 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1318 LookupParsedName(R, S, &SS); 1319 1320 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1321 if (!TyD) { 1322 if (R.isAmbiguous()) return true; 1323 1324 // We don't want access-control diagnostics here. 1325 R.suppressDiagnostics(); 1326 1327 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1328 bool NotUnknownSpecialization = false; 1329 DeclContext *DC = computeDeclContext(SS, false); 1330 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1331 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1332 1333 if (!NotUnknownSpecialization) { 1334 // When the scope specifier can refer to a member of an unknown 1335 // specialization, we take it as a type name. 1336 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1337 SS.getWithLocInContext(Context), 1338 *MemberOrBase, IdLoc); 1339 if (BaseType.isNull()) 1340 return true; 1341 1342 R.clear(); 1343 R.setLookupName(MemberOrBase); 1344 } 1345 } 1346 1347 // If no results were found, try to correct typos. 1348 if (R.empty() && BaseType.isNull() && 1349 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1350 R.isSingleResult()) { 1351 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1352 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1353 // We have found a non-static data member with a similar 1354 // name to what was typed; complain and initialize that 1355 // member. 1356 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1357 << MemberOrBase << true << R.getLookupName() 1358 << FixItHint::CreateReplacement(R.getNameLoc(), 1359 R.getLookupName().getAsString()); 1360 Diag(Member->getLocation(), diag::note_previous_decl) 1361 << Member->getDeclName(); 1362 1363 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1364 LParenLoc, RParenLoc); 1365 } 1366 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1367 const CXXBaseSpecifier *DirectBaseSpec; 1368 const CXXBaseSpecifier *VirtualBaseSpec; 1369 if (FindBaseInitializer(*this, ClassDecl, 1370 Context.getTypeDeclType(Type), 1371 DirectBaseSpec, VirtualBaseSpec)) { 1372 // We have found a direct or virtual base class with a 1373 // similar name to what was typed; complain and initialize 1374 // that base class. 1375 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1376 << MemberOrBase << false << R.getLookupName() 1377 << FixItHint::CreateReplacement(R.getNameLoc(), 1378 R.getLookupName().getAsString()); 1379 1380 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1381 : VirtualBaseSpec; 1382 Diag(BaseSpec->getSourceRange().getBegin(), 1383 diag::note_base_class_specified_here) 1384 << BaseSpec->getType() 1385 << BaseSpec->getSourceRange(); 1386 1387 TyD = Type; 1388 } 1389 } 1390 } 1391 1392 if (!TyD && BaseType.isNull()) { 1393 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1394 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1395 return true; 1396 } 1397 } 1398 1399 if (BaseType.isNull()) { 1400 BaseType = Context.getTypeDeclType(TyD); 1401 if (SS.isSet()) { 1402 NestedNameSpecifier *Qualifier = 1403 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1404 1405 // FIXME: preserve source range information 1406 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1407 } 1408 } 1409 } 1410 1411 if (!TInfo) 1412 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1413 1414 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1415 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1416} 1417 1418/// Checks an initializer expression for use of uninitialized fields, such as 1419/// containing the field that is being initialized. Returns true if there is an 1420/// uninitialized field was used an updates the SourceLocation parameter; false 1421/// otherwise. 1422static bool InitExprContainsUninitializedFields(const Stmt *S, 1423 const ValueDecl *LhsField, 1424 SourceLocation *L) { 1425 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1426 1427 if (isa<CallExpr>(S)) { 1428 // Do not descend into function calls or constructors, as the use 1429 // of an uninitialized field may be valid. One would have to inspect 1430 // the contents of the function/ctor to determine if it is safe or not. 1431 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1432 // may be safe, depending on what the function/ctor does. 1433 return false; 1434 } 1435 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1436 const NamedDecl *RhsField = ME->getMemberDecl(); 1437 1438 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1439 // The member expression points to a static data member. 1440 assert(VD->isStaticDataMember() && 1441 "Member points to non-static data member!"); 1442 (void)VD; 1443 return false; 1444 } 1445 1446 if (isa<EnumConstantDecl>(RhsField)) { 1447 // The member expression points to an enum. 1448 return false; 1449 } 1450 1451 if (RhsField == LhsField) { 1452 // Initializing a field with itself. Throw a warning. 1453 // But wait; there are exceptions! 1454 // Exception #1: The field may not belong to this record. 1455 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1456 const Expr *base = ME->getBase(); 1457 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1458 // Even though the field matches, it does not belong to this record. 1459 return false; 1460 } 1461 // None of the exceptions triggered; return true to indicate an 1462 // uninitialized field was used. 1463 *L = ME->getMemberLoc(); 1464 return true; 1465 } 1466 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1467 // sizeof/alignof doesn't reference contents, do not warn. 1468 return false; 1469 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1470 // address-of doesn't reference contents (the pointer may be dereferenced 1471 // in the same expression but it would be rare; and weird). 1472 if (UOE->getOpcode() == UO_AddrOf) 1473 return false; 1474 } 1475 for (Stmt::const_child_range it = S->children(); it; ++it) { 1476 if (!*it) { 1477 // An expression such as 'member(arg ?: "")' may trigger this. 1478 continue; 1479 } 1480 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1481 return true; 1482 } 1483 return false; 1484} 1485 1486MemInitResult 1487Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1488 unsigned NumArgs, SourceLocation IdLoc, 1489 SourceLocation LParenLoc, 1490 SourceLocation RParenLoc) { 1491 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1492 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1493 assert((DirectMember || IndirectMember) && 1494 "Member must be a FieldDecl or IndirectFieldDecl"); 1495 1496 if (Member->isInvalidDecl()) 1497 return true; 1498 1499 // Diagnose value-uses of fields to initialize themselves, e.g. 1500 // foo(foo) 1501 // where foo is not also a parameter to the constructor. 1502 // TODO: implement -Wuninitialized and fold this into that framework. 1503 for (unsigned i = 0; i < NumArgs; ++i) { 1504 SourceLocation L; 1505 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1506 // FIXME: Return true in the case when other fields are used before being 1507 // uninitialized. For example, let this field be the i'th field. When 1508 // initializing the i'th field, throw a warning if any of the >= i'th 1509 // fields are used, as they are not yet initialized. 1510 // Right now we are only handling the case where the i'th field uses 1511 // itself in its initializer. 1512 Diag(L, diag::warn_field_is_uninit); 1513 } 1514 } 1515 1516 bool HasDependentArg = false; 1517 for (unsigned i = 0; i < NumArgs; i++) 1518 HasDependentArg |= Args[i]->isTypeDependent(); 1519 1520 Expr *Init; 1521 if (Member->getType()->isDependentType() || HasDependentArg) { 1522 // Can't check initialization for a member of dependent type or when 1523 // any of the arguments are type-dependent expressions. 1524 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1525 RParenLoc); 1526 1527 // Erase any temporaries within this evaluation context; we're not 1528 // going to track them in the AST, since we'll be rebuilding the 1529 // ASTs during template instantiation. 1530 ExprTemporaries.erase( 1531 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1532 ExprTemporaries.end()); 1533 } else { 1534 // Initialize the member. 1535 InitializedEntity MemberEntity = 1536 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1537 : InitializedEntity::InitializeMember(IndirectMember, 0); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1542 1543 ExprResult MemberInit = 1544 InitSeq.Perform(*this, MemberEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (MemberInit.isInvalid()) 1547 return true; 1548 1549 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1550 1551 // C++0x [class.base.init]p7: 1552 // The initialization of each base and member constitutes a 1553 // full-expression. 1554 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 // If we are in a dependent context, template instantiation will 1559 // perform this type-checking again. Just save the arguments that we 1560 // received in a ParenListExpr. 1561 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1562 // of the information that we have about the member 1563 // initializer. However, deconstructing the ASTs is a dicey process, 1564 // and this approach is far more likely to get the corner cases right. 1565 if (CurContext->isDependentContext()) 1566 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1567 RParenLoc); 1568 else 1569 Init = MemberInit.get(); 1570 } 1571 1572 if (DirectMember) { 1573 return new (Context) CXXCtorInitializer(Context, DirectMember, 1574 IdLoc, LParenLoc, Init, 1575 RParenLoc); 1576 } else { 1577 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1578 IdLoc, LParenLoc, Init, 1579 RParenLoc); 1580 } 1581} 1582 1583MemInitResult 1584Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation NameLoc, 1587 SourceLocation LParenLoc, 1588 SourceLocation RParenLoc, 1589 CXXRecordDecl *ClassDecl) { 1590 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1591 if (!LangOpts.CPlusPlus0x) 1592 return Diag(Loc, diag::err_delegation_0x_only) 1593 << TInfo->getTypeLoc().getLocalSourceRange(); 1594 1595 // Initialize the object. 1596 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1597 QualType(ClassDecl->getTypeForDecl(), 0)); 1598 InitializationKind Kind = 1599 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1600 1601 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1602 1603 ExprResult DelegationInit = 1604 InitSeq.Perform(*this, DelegationEntity, Kind, 1605 MultiExprArg(*this, Args, NumArgs), 0); 1606 if (DelegationInit.isInvalid()) 1607 return true; 1608 1609 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1610 CXXConstructorDecl *Constructor 1611 = ConExpr->getConstructor(); 1612 assert(Constructor && "Delegating constructor with no target?"); 1613 1614 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1615 1616 // C++0x [class.base.init]p7: 1617 // The initialization of each base and member constitutes a 1618 // full-expression. 1619 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1620 if (DelegationInit.isInvalid()) 1621 return true; 1622 1623 // If we are in a dependent context, template instantiation will 1624 // perform this type-checking again. Just save the arguments that we 1625 // received in a ParenListExpr. 1626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1627 // of the information that we have about the base 1628 // initializer. However, deconstructing the ASTs is a dicey process, 1629 // and this approach is far more likely to get the corner cases right. 1630 if (CurContext->isDependentContext()) { 1631 ExprResult Init 1632 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1633 NumArgs, RParenLoc)); 1634 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1635 Constructor, Init.takeAs<Expr>(), 1636 RParenLoc); 1637 } 1638 1639 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1640 DelegationInit.takeAs<Expr>(), 1641 RParenLoc); 1642} 1643 1644MemInitResult 1645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1646 Expr **Args, unsigned NumArgs, 1647 SourceLocation LParenLoc, SourceLocation RParenLoc, 1648 CXXRecordDecl *ClassDecl, 1649 SourceLocation EllipsisLoc) { 1650 bool HasDependentArg = false; 1651 for (unsigned i = 0; i < NumArgs; i++) 1652 HasDependentArg |= Args[i]->isTypeDependent(); 1653 1654 SourceLocation BaseLoc 1655 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1656 1657 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1658 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1659 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1660 1661 // C++ [class.base.init]p2: 1662 // [...] Unless the mem-initializer-id names a nonstatic data 1663 // member of the constructor's class or a direct or virtual base 1664 // of that class, the mem-initializer is ill-formed. A 1665 // mem-initializer-list can initialize a base class using any 1666 // name that denotes that base class type. 1667 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1668 1669 if (EllipsisLoc.isValid()) { 1670 // This is a pack expansion. 1671 if (!BaseType->containsUnexpandedParameterPack()) { 1672 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1673 << SourceRange(BaseLoc, RParenLoc); 1674 1675 EllipsisLoc = SourceLocation(); 1676 } 1677 } else { 1678 // Check for any unexpanded parameter packs. 1679 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1680 return true; 1681 1682 for (unsigned I = 0; I != NumArgs; ++I) 1683 if (DiagnoseUnexpandedParameterPack(Args[I])) 1684 return true; 1685 } 1686 1687 // Check for direct and virtual base classes. 1688 const CXXBaseSpecifier *DirectBaseSpec = 0; 1689 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1690 if (!Dependent) { 1691 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1692 BaseType)) 1693 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1694 LParenLoc, RParenLoc, ClassDecl); 1695 1696 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1697 VirtualBaseSpec); 1698 1699 // C++ [base.class.init]p2: 1700 // Unless the mem-initializer-id names a nonstatic data member of the 1701 // constructor's class or a direct or virtual base of that class, the 1702 // mem-initializer is ill-formed. 1703 if (!DirectBaseSpec && !VirtualBaseSpec) { 1704 // If the class has any dependent bases, then it's possible that 1705 // one of those types will resolve to the same type as 1706 // BaseType. Therefore, just treat this as a dependent base 1707 // class initialization. FIXME: Should we try to check the 1708 // initialization anyway? It seems odd. 1709 if (ClassDecl->hasAnyDependentBases()) 1710 Dependent = true; 1711 else 1712 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1713 << BaseType << Context.getTypeDeclType(ClassDecl) 1714 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1715 } 1716 } 1717 1718 if (Dependent) { 1719 // Can't check initialization for a base of dependent type or when 1720 // any of the arguments are type-dependent expressions. 1721 ExprResult BaseInit 1722 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1723 RParenLoc)); 1724 1725 // Erase any temporaries within this evaluation context; we're not 1726 // going to track them in the AST, since we'll be rebuilding the 1727 // ASTs during template instantiation. 1728 ExprTemporaries.erase( 1729 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1730 ExprTemporaries.end()); 1731 1732 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1733 /*IsVirtual=*/false, 1734 LParenLoc, 1735 BaseInit.takeAs<Expr>(), 1736 RParenLoc, 1737 EllipsisLoc); 1738 } 1739 1740 // C++ [base.class.init]p2: 1741 // If a mem-initializer-id is ambiguous because it designates both 1742 // a direct non-virtual base class and an inherited virtual base 1743 // class, the mem-initializer is ill-formed. 1744 if (DirectBaseSpec && VirtualBaseSpec) 1745 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1746 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1747 1748 CXXBaseSpecifier *BaseSpec 1749 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1750 if (!BaseSpec) 1751 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1752 1753 // Initialize the base. 1754 InitializedEntity BaseEntity = 1755 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1756 InitializationKind Kind = 1757 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1758 1759 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1760 1761 ExprResult BaseInit = 1762 InitSeq.Perform(*this, BaseEntity, Kind, 1763 MultiExprArg(*this, Args, NumArgs), 0); 1764 if (BaseInit.isInvalid()) 1765 return true; 1766 1767 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1768 1769 // C++0x [class.base.init]p7: 1770 // The initialization of each base and member constitutes a 1771 // full-expression. 1772 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 // If we are in a dependent context, template instantiation will 1777 // perform this type-checking again. Just save the arguments that we 1778 // received in a ParenListExpr. 1779 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1780 // of the information that we have about the base 1781 // initializer. However, deconstructing the ASTs is a dicey process, 1782 // and this approach is far more likely to get the corner cases right. 1783 if (CurContext->isDependentContext()) { 1784 ExprResult Init 1785 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1786 RParenLoc)); 1787 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1788 BaseSpec->isVirtual(), 1789 LParenLoc, 1790 Init.takeAs<Expr>(), 1791 RParenLoc, 1792 EllipsisLoc); 1793 } 1794 1795 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1796 BaseSpec->isVirtual(), 1797 LParenLoc, 1798 BaseInit.takeAs<Expr>(), 1799 RParenLoc, 1800 EllipsisLoc); 1801} 1802 1803/// ImplicitInitializerKind - How an implicit base or member initializer should 1804/// initialize its base or member. 1805enum ImplicitInitializerKind { 1806 IIK_Default, 1807 IIK_Copy, 1808 IIK_Move 1809}; 1810 1811static bool 1812BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1813 ImplicitInitializerKind ImplicitInitKind, 1814 CXXBaseSpecifier *BaseSpec, 1815 bool IsInheritedVirtualBase, 1816 CXXCtorInitializer *&CXXBaseInit) { 1817 InitializedEntity InitEntity 1818 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1819 IsInheritedVirtualBase); 1820 1821 ExprResult BaseInit; 1822 1823 switch (ImplicitInitKind) { 1824 case IIK_Default: { 1825 InitializationKind InitKind 1826 = InitializationKind::CreateDefault(Constructor->getLocation()); 1827 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1828 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1829 MultiExprArg(SemaRef, 0, 0)); 1830 break; 1831 } 1832 1833 case IIK_Copy: { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *CopyCtorArg = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Constructor->getLocation(), ParamType, 1840 VK_LValue, 0); 1841 1842 // Cast to the base class to avoid ambiguities. 1843 QualType ArgTy = 1844 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1845 ParamType.getQualifiers()); 1846 1847 CXXCastPath BasePath; 1848 BasePath.push_back(BaseSpec); 1849 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1850 CK_UncheckedDerivedToBase, 1851 VK_LValue, &BasePath).take(); 1852 1853 InitializationKind InitKind 1854 = InitializationKind::CreateDirect(Constructor->getLocation(), 1855 SourceLocation(), SourceLocation()); 1856 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1857 &CopyCtorArg, 1); 1858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1859 MultiExprArg(&CopyCtorArg, 1)); 1860 break; 1861 } 1862 1863 case IIK_Move: 1864 assert(false && "Unhandled initializer kind!"); 1865 } 1866 1867 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 CXXBaseInit = 1872 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1873 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1874 SourceLocation()), 1875 BaseSpec->isVirtual(), 1876 SourceLocation(), 1877 BaseInit.takeAs<Expr>(), 1878 SourceLocation(), 1879 SourceLocation()); 1880 1881 return false; 1882} 1883 1884static bool 1885BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 FieldDecl *Field, 1888 CXXCtorInitializer *&CXXMemberInit) { 1889 if (Field->isInvalidDecl()) 1890 return true; 1891 1892 SourceLocation Loc = Constructor->getLocation(); 1893 1894 if (ImplicitInitKind == IIK_Copy) { 1895 ParmVarDecl *Param = Constructor->getParamDecl(0); 1896 QualType ParamType = Param->getType().getNonReferenceType(); 1897 1898 Expr *MemberExprBase = 1899 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1900 Loc, ParamType, VK_LValue, 0); 1901 1902 // Build a reference to this field within the parameter. 1903 CXXScopeSpec SS; 1904 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1905 Sema::LookupMemberName); 1906 MemberLookup.addDecl(Field, AS_public); 1907 MemberLookup.resolveKind(); 1908 ExprResult CopyCtorArg 1909 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1910 ParamType, Loc, 1911 /*IsArrow=*/false, 1912 SS, 1913 /*FirstQualifierInScope=*/0, 1914 MemberLookup, 1915 /*TemplateArgs=*/0); 1916 if (CopyCtorArg.isInvalid()) 1917 return true; 1918 1919 // When the field we are copying is an array, create index variables for 1920 // each dimension of the array. We use these index variables to subscript 1921 // the source array, and other clients (e.g., CodeGen) will perform the 1922 // necessary iteration with these index variables. 1923 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1924 QualType BaseType = Field->getType(); 1925 QualType SizeType = SemaRef.Context.getSizeType(); 1926 while (const ConstantArrayType *Array 1927 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1928 // Create the iteration variable for this array index. 1929 IdentifierInfo *IterationVarName = 0; 1930 { 1931 llvm::SmallString<8> Str; 1932 llvm::raw_svector_ostream OS(Str); 1933 OS << "__i" << IndexVariables.size(); 1934 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1935 } 1936 VarDecl *IterationVar 1937 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1938 IterationVarName, SizeType, 1939 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1940 SC_None, SC_None); 1941 IndexVariables.push_back(IterationVar); 1942 1943 // Create a reference to the iteration variable. 1944 ExprResult IterationVarRef 1945 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1946 assert(!IterationVarRef.isInvalid() && 1947 "Reference to invented variable cannot fail!"); 1948 1949 // Subscript the array with this iteration variable. 1950 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1951 Loc, 1952 IterationVarRef.take(), 1953 Loc); 1954 if (CopyCtorArg.isInvalid()) 1955 return true; 1956 1957 BaseType = Array->getElementType(); 1958 } 1959 1960 // Construct the entity that we will be initializing. For an array, this 1961 // will be first element in the array, which may require several levels 1962 // of array-subscript entities. 1963 llvm::SmallVector<InitializedEntity, 4> Entities; 1964 Entities.reserve(1 + IndexVariables.size()); 1965 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1966 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1967 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1968 0, 1969 Entities.back())); 1970 1971 // Direct-initialize to use the copy constructor. 1972 InitializationKind InitKind = 1973 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1974 1975 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1976 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1977 &CopyCtorArgE, 1); 1978 1979 ExprResult MemberInit 1980 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1981 MultiExprArg(&CopyCtorArgE, 1)); 1982 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1983 if (MemberInit.isInvalid()) 1984 return true; 1985 1986 CXXMemberInit 1987 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1988 MemberInit.takeAs<Expr>(), Loc, 1989 IndexVariables.data(), 1990 IndexVariables.size()); 1991 return false; 1992 } 1993 1994 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1995 1996 QualType FieldBaseElementType = 1997 SemaRef.Context.getBaseElementType(Field->getType()); 1998 1999 if (FieldBaseElementType->isRecordType()) { 2000 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2001 InitializationKind InitKind = 2002 InitializationKind::CreateDefault(Loc); 2003 2004 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2005 ExprResult MemberInit = 2006 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2007 2008 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2009 if (MemberInit.isInvalid()) 2010 return true; 2011 2012 CXXMemberInit = 2013 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2014 Field, Loc, Loc, 2015 MemberInit.get(), 2016 Loc); 2017 return false; 2018 } 2019 2020 if (!Field->getParent()->isUnion()) { 2021 if (FieldBaseElementType->isReferenceType()) { 2022 SemaRef.Diag(Constructor->getLocation(), 2023 diag::err_uninitialized_member_in_ctor) 2024 << (int)Constructor->isImplicit() 2025 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2026 << 0 << Field->getDeclName(); 2027 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2028 return true; 2029 } 2030 2031 if (FieldBaseElementType.isConstQualified()) { 2032 SemaRef.Diag(Constructor->getLocation(), 2033 diag::err_uninitialized_member_in_ctor) 2034 << (int)Constructor->isImplicit() 2035 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2036 << 1 << Field->getDeclName(); 2037 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2038 return true; 2039 } 2040 } 2041 2042 // Nothing to initialize. 2043 CXXMemberInit = 0; 2044 return false; 2045} 2046 2047namespace { 2048struct BaseAndFieldInfo { 2049 Sema &S; 2050 CXXConstructorDecl *Ctor; 2051 bool AnyErrorsInInits; 2052 ImplicitInitializerKind IIK; 2053 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2054 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2055 2056 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2057 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2058 // FIXME: Handle implicit move constructors. 2059 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2060 IIK = IIK_Copy; 2061 else 2062 IIK = IIK_Default; 2063 } 2064}; 2065} 2066 2067static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2068 FieldDecl *Top, FieldDecl *Field) { 2069 2070 // Overwhelmingly common case: we have a direct initializer for this field. 2071 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2072 Info.AllToInit.push_back(Init); 2073 return false; 2074 } 2075 2076 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2077 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2078 assert(FieldClassType && "anonymous struct/union without record type"); 2079 CXXRecordDecl *FieldClassDecl 2080 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2081 2082 // Even though union members never have non-trivial default 2083 // constructions in C++03, we still build member initializers for aggregate 2084 // record types which can be union members, and C++0x allows non-trivial 2085 // default constructors for union members, so we ensure that only one 2086 // member is initialized for these. 2087 if (FieldClassDecl->isUnion()) { 2088 // First check for an explicit initializer for one field. 2089 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2090 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2091 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2092 Info.AllToInit.push_back(Init); 2093 2094 // Once we've initialized a field of an anonymous union, the union 2095 // field in the class is also initialized, so exit immediately. 2096 return false; 2097 } else if ((*FA)->isAnonymousStructOrUnion()) { 2098 if (CollectFieldInitializer(Info, Top, *FA)) 2099 return true; 2100 } 2101 } 2102 2103 // Fallthrough and construct a default initializer for the union as 2104 // a whole, which can call its default constructor if such a thing exists 2105 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2106 // behavior going forward with C++0x, when anonymous unions there are 2107 // finalized, we should revisit this. 2108 } else { 2109 // For structs, we simply descend through to initialize all members where 2110 // necessary. 2111 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2112 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2113 if (CollectFieldInitializer(Info, Top, *FA)) 2114 return true; 2115 } 2116 } 2117 } 2118 2119 // Don't try to build an implicit initializer if there were semantic 2120 // errors in any of the initializers (and therefore we might be 2121 // missing some that the user actually wrote). 2122 if (Info.AnyErrorsInInits) 2123 return false; 2124 2125 CXXCtorInitializer *Init = 0; 2126 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2127 return true; 2128 2129 if (Init) 2130 Info.AllToInit.push_back(Init); 2131 2132 return false; 2133} 2134 2135bool 2136Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2137 CXXCtorInitializer *Initializer) { 2138 assert(Initializer->isDelegatingInitializer()); 2139 Constructor->setNumCtorInitializers(1); 2140 CXXCtorInitializer **initializer = 2141 new (Context) CXXCtorInitializer*[1]; 2142 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2143 Constructor->setCtorInitializers(initializer); 2144 2145 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2146 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2147 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2148 } 2149 2150 DelegatingCtorDecls.push_back(Constructor); 2151 2152 return false; 2153} 2154 2155bool 2156Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2157 CXXCtorInitializer **Initializers, 2158 unsigned NumInitializers, 2159 bool AnyErrors) { 2160 if (Constructor->getDeclContext()->isDependentContext()) { 2161 // Just store the initializers as written, they will be checked during 2162 // instantiation. 2163 if (NumInitializers > 0) { 2164 Constructor->setNumCtorInitializers(NumInitializers); 2165 CXXCtorInitializer **baseOrMemberInitializers = 2166 new (Context) CXXCtorInitializer*[NumInitializers]; 2167 memcpy(baseOrMemberInitializers, Initializers, 2168 NumInitializers * sizeof(CXXCtorInitializer*)); 2169 Constructor->setCtorInitializers(baseOrMemberInitializers); 2170 } 2171 2172 return false; 2173 } 2174 2175 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2176 2177 // We need to build the initializer AST according to order of construction 2178 // and not what user specified in the Initializers list. 2179 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2180 if (!ClassDecl) 2181 return true; 2182 2183 bool HadError = false; 2184 2185 for (unsigned i = 0; i < NumInitializers; i++) { 2186 CXXCtorInitializer *Member = Initializers[i]; 2187 2188 if (Member->isBaseInitializer()) 2189 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2190 else 2191 Info.AllBaseFields[Member->getAnyMember()] = Member; 2192 } 2193 2194 // Keep track of the direct virtual bases. 2195 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2196 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2197 E = ClassDecl->bases_end(); I != E; ++I) { 2198 if (I->isVirtual()) 2199 DirectVBases.insert(I); 2200 } 2201 2202 // Push virtual bases before others. 2203 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2204 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2205 2206 if (CXXCtorInitializer *Value 2207 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2208 Info.AllToInit.push_back(Value); 2209 } else if (!AnyErrors) { 2210 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2211 CXXCtorInitializer *CXXBaseInit; 2212 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2213 VBase, IsInheritedVirtualBase, 2214 CXXBaseInit)) { 2215 HadError = true; 2216 continue; 2217 } 2218 2219 Info.AllToInit.push_back(CXXBaseInit); 2220 } 2221 } 2222 2223 // Non-virtual bases. 2224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2225 E = ClassDecl->bases_end(); Base != E; ++Base) { 2226 // Virtuals are in the virtual base list and already constructed. 2227 if (Base->isVirtual()) 2228 continue; 2229 2230 if (CXXCtorInitializer *Value 2231 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2232 Info.AllToInit.push_back(Value); 2233 } else if (!AnyErrors) { 2234 CXXCtorInitializer *CXXBaseInit; 2235 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2236 Base, /*IsInheritedVirtualBase=*/false, 2237 CXXBaseInit)) { 2238 HadError = true; 2239 continue; 2240 } 2241 2242 Info.AllToInit.push_back(CXXBaseInit); 2243 } 2244 } 2245 2246 // Fields. 2247 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2248 E = ClassDecl->field_end(); Field != E; ++Field) { 2249 if ((*Field)->getType()->isIncompleteArrayType()) { 2250 assert(ClassDecl->hasFlexibleArrayMember() && 2251 "Incomplete array type is not valid"); 2252 continue; 2253 } 2254 if (CollectFieldInitializer(Info, *Field, *Field)) 2255 HadError = true; 2256 } 2257 2258 NumInitializers = Info.AllToInit.size(); 2259 if (NumInitializers > 0) { 2260 Constructor->setNumCtorInitializers(NumInitializers); 2261 CXXCtorInitializer **baseOrMemberInitializers = 2262 new (Context) CXXCtorInitializer*[NumInitializers]; 2263 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2264 NumInitializers * sizeof(CXXCtorInitializer*)); 2265 Constructor->setCtorInitializers(baseOrMemberInitializers); 2266 2267 // Constructors implicitly reference the base and member 2268 // destructors. 2269 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2270 Constructor->getParent()); 2271 } 2272 2273 return HadError; 2274} 2275 2276static void *GetKeyForTopLevelField(FieldDecl *Field) { 2277 // For anonymous unions, use the class declaration as the key. 2278 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2279 if (RT->getDecl()->isAnonymousStructOrUnion()) 2280 return static_cast<void *>(RT->getDecl()); 2281 } 2282 return static_cast<void *>(Field); 2283} 2284 2285static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2286 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2287} 2288 2289static void *GetKeyForMember(ASTContext &Context, 2290 CXXCtorInitializer *Member) { 2291 if (!Member->isAnyMemberInitializer()) 2292 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2293 2294 // For fields injected into the class via declaration of an anonymous union, 2295 // use its anonymous union class declaration as the unique key. 2296 FieldDecl *Field = Member->getAnyMember(); 2297 2298 // If the field is a member of an anonymous struct or union, our key 2299 // is the anonymous record decl that's a direct child of the class. 2300 RecordDecl *RD = Field->getParent(); 2301 if (RD->isAnonymousStructOrUnion()) { 2302 while (true) { 2303 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2304 if (Parent->isAnonymousStructOrUnion()) 2305 RD = Parent; 2306 else 2307 break; 2308 } 2309 2310 return static_cast<void *>(RD); 2311 } 2312 2313 return static_cast<void *>(Field); 2314} 2315 2316static void 2317DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2318 const CXXConstructorDecl *Constructor, 2319 CXXCtorInitializer **Inits, 2320 unsigned NumInits) { 2321 if (Constructor->getDeclContext()->isDependentContext()) 2322 return; 2323 2324 // Don't check initializers order unless the warning is enabled at the 2325 // location of at least one initializer. 2326 bool ShouldCheckOrder = false; 2327 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2328 CXXCtorInitializer *Init = Inits[InitIndex]; 2329 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2330 Init->getSourceLocation()) 2331 != Diagnostic::Ignored) { 2332 ShouldCheckOrder = true; 2333 break; 2334 } 2335 } 2336 if (!ShouldCheckOrder) 2337 return; 2338 2339 // Build the list of bases and members in the order that they'll 2340 // actually be initialized. The explicit initializers should be in 2341 // this same order but may be missing things. 2342 llvm::SmallVector<const void*, 32> IdealInitKeys; 2343 2344 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2345 2346 // 1. Virtual bases. 2347 for (CXXRecordDecl::base_class_const_iterator VBase = 2348 ClassDecl->vbases_begin(), 2349 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2350 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2351 2352 // 2. Non-virtual bases. 2353 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2354 E = ClassDecl->bases_end(); Base != E; ++Base) { 2355 if (Base->isVirtual()) 2356 continue; 2357 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2358 } 2359 2360 // 3. Direct fields. 2361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2362 E = ClassDecl->field_end(); Field != E; ++Field) 2363 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2364 2365 unsigned NumIdealInits = IdealInitKeys.size(); 2366 unsigned IdealIndex = 0; 2367 2368 CXXCtorInitializer *PrevInit = 0; 2369 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2370 CXXCtorInitializer *Init = Inits[InitIndex]; 2371 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2372 2373 // Scan forward to try to find this initializer in the idealized 2374 // initializers list. 2375 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2376 if (InitKey == IdealInitKeys[IdealIndex]) 2377 break; 2378 2379 // If we didn't find this initializer, it must be because we 2380 // scanned past it on a previous iteration. That can only 2381 // happen if we're out of order; emit a warning. 2382 if (IdealIndex == NumIdealInits && PrevInit) { 2383 Sema::SemaDiagnosticBuilder D = 2384 SemaRef.Diag(PrevInit->getSourceLocation(), 2385 diag::warn_initializer_out_of_order); 2386 2387 if (PrevInit->isAnyMemberInitializer()) 2388 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2389 else 2390 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2391 2392 if (Init->isAnyMemberInitializer()) 2393 D << 0 << Init->getAnyMember()->getDeclName(); 2394 else 2395 D << 1 << Init->getBaseClassInfo()->getType(); 2396 2397 // Move back to the initializer's location in the ideal list. 2398 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2399 if (InitKey == IdealInitKeys[IdealIndex]) 2400 break; 2401 2402 assert(IdealIndex != NumIdealInits && 2403 "initializer not found in initializer list"); 2404 } 2405 2406 PrevInit = Init; 2407 } 2408} 2409 2410namespace { 2411bool CheckRedundantInit(Sema &S, 2412 CXXCtorInitializer *Init, 2413 CXXCtorInitializer *&PrevInit) { 2414 if (!PrevInit) { 2415 PrevInit = Init; 2416 return false; 2417 } 2418 2419 if (FieldDecl *Field = Init->getMember()) 2420 S.Diag(Init->getSourceLocation(), 2421 diag::err_multiple_mem_initialization) 2422 << Field->getDeclName() 2423 << Init->getSourceRange(); 2424 else { 2425 const Type *BaseClass = Init->getBaseClass(); 2426 assert(BaseClass && "neither field nor base"); 2427 S.Diag(Init->getSourceLocation(), 2428 diag::err_multiple_base_initialization) 2429 << QualType(BaseClass, 0) 2430 << Init->getSourceRange(); 2431 } 2432 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2433 << 0 << PrevInit->getSourceRange(); 2434 2435 return true; 2436} 2437 2438typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2439typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2440 2441bool CheckRedundantUnionInit(Sema &S, 2442 CXXCtorInitializer *Init, 2443 RedundantUnionMap &Unions) { 2444 FieldDecl *Field = Init->getAnyMember(); 2445 RecordDecl *Parent = Field->getParent(); 2446 if (!Parent->isAnonymousStructOrUnion()) 2447 return false; 2448 2449 NamedDecl *Child = Field; 2450 do { 2451 if (Parent->isUnion()) { 2452 UnionEntry &En = Unions[Parent]; 2453 if (En.first && En.first != Child) { 2454 S.Diag(Init->getSourceLocation(), 2455 diag::err_multiple_mem_union_initialization) 2456 << Field->getDeclName() 2457 << Init->getSourceRange(); 2458 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2459 << 0 << En.second->getSourceRange(); 2460 return true; 2461 } else if (!En.first) { 2462 En.first = Child; 2463 En.second = Init; 2464 } 2465 } 2466 2467 Child = Parent; 2468 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2469 } while (Parent->isAnonymousStructOrUnion()); 2470 2471 return false; 2472} 2473} 2474 2475/// ActOnMemInitializers - Handle the member initializers for a constructor. 2476void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2477 SourceLocation ColonLoc, 2478 MemInitTy **meminits, unsigned NumMemInits, 2479 bool AnyErrors) { 2480 if (!ConstructorDecl) 2481 return; 2482 2483 AdjustDeclIfTemplate(ConstructorDecl); 2484 2485 CXXConstructorDecl *Constructor 2486 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2487 2488 if (!Constructor) { 2489 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2490 return; 2491 } 2492 2493 CXXCtorInitializer **MemInits = 2494 reinterpret_cast<CXXCtorInitializer **>(meminits); 2495 2496 // Mapping for the duplicate initializers check. 2497 // For member initializers, this is keyed with a FieldDecl*. 2498 // For base initializers, this is keyed with a Type*. 2499 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2500 2501 // Mapping for the inconsistent anonymous-union initializers check. 2502 RedundantUnionMap MemberUnions; 2503 2504 bool HadError = false; 2505 for (unsigned i = 0; i < NumMemInits; i++) { 2506 CXXCtorInitializer *Init = MemInits[i]; 2507 2508 // Set the source order index. 2509 Init->setSourceOrder(i); 2510 2511 if (Init->isAnyMemberInitializer()) { 2512 FieldDecl *Field = Init->getAnyMember(); 2513 if (CheckRedundantInit(*this, Init, Members[Field]) || 2514 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2515 HadError = true; 2516 } else if (Init->isBaseInitializer()) { 2517 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2518 if (CheckRedundantInit(*this, Init, Members[Key])) 2519 HadError = true; 2520 } else { 2521 assert(Init->isDelegatingInitializer()); 2522 // This must be the only initializer 2523 if (i != 0 || NumMemInits > 1) { 2524 Diag(MemInits[0]->getSourceLocation(), 2525 diag::err_delegating_initializer_alone) 2526 << MemInits[0]->getSourceRange(); 2527 HadError = true; 2528 // We will treat this as being the only initializer. 2529 } 2530 SetDelegatingInitializer(Constructor, MemInits[i]); 2531 // Return immediately as the initializer is set. 2532 return; 2533 } 2534 } 2535 2536 if (HadError) 2537 return; 2538 2539 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2540 2541 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2542} 2543 2544void 2545Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2546 CXXRecordDecl *ClassDecl) { 2547 // Ignore dependent contexts. 2548 if (ClassDecl->isDependentContext()) 2549 return; 2550 2551 // FIXME: all the access-control diagnostics are positioned on the 2552 // field/base declaration. That's probably good; that said, the 2553 // user might reasonably want to know why the destructor is being 2554 // emitted, and we currently don't say. 2555 2556 // Non-static data members. 2557 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2558 E = ClassDecl->field_end(); I != E; ++I) { 2559 FieldDecl *Field = *I; 2560 if (Field->isInvalidDecl()) 2561 continue; 2562 QualType FieldType = Context.getBaseElementType(Field->getType()); 2563 2564 const RecordType* RT = FieldType->getAs<RecordType>(); 2565 if (!RT) 2566 continue; 2567 2568 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2569 if (FieldClassDecl->isInvalidDecl()) 2570 continue; 2571 if (FieldClassDecl->hasTrivialDestructor()) 2572 continue; 2573 2574 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2575 assert(Dtor && "No dtor found for FieldClassDecl!"); 2576 CheckDestructorAccess(Field->getLocation(), Dtor, 2577 PDiag(diag::err_access_dtor_field) 2578 << Field->getDeclName() 2579 << FieldType); 2580 2581 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2582 } 2583 2584 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2585 2586 // Bases. 2587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2588 E = ClassDecl->bases_end(); Base != E; ++Base) { 2589 // Bases are always records in a well-formed non-dependent class. 2590 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2591 2592 // Remember direct virtual bases. 2593 if (Base->isVirtual()) 2594 DirectVirtualBases.insert(RT); 2595 2596 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2597 // If our base class is invalid, we probably can't get its dtor anyway. 2598 if (BaseClassDecl->isInvalidDecl()) 2599 continue; 2600 // Ignore trivial destructors. 2601 if (BaseClassDecl->hasTrivialDestructor()) 2602 continue; 2603 2604 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2605 assert(Dtor && "No dtor found for BaseClassDecl!"); 2606 2607 // FIXME: caret should be on the start of the class name 2608 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2609 PDiag(diag::err_access_dtor_base) 2610 << Base->getType() 2611 << Base->getSourceRange()); 2612 2613 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2614 } 2615 2616 // Virtual bases. 2617 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2618 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2619 2620 // Bases are always records in a well-formed non-dependent class. 2621 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2622 2623 // Ignore direct virtual bases. 2624 if (DirectVirtualBases.count(RT)) 2625 continue; 2626 2627 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2628 // If our base class is invalid, we probably can't get its dtor anyway. 2629 if (BaseClassDecl->isInvalidDecl()) 2630 continue; 2631 // Ignore trivial destructors. 2632 if (BaseClassDecl->hasTrivialDestructor()) 2633 continue; 2634 2635 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2636 assert(Dtor && "No dtor found for BaseClassDecl!"); 2637 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2638 PDiag(diag::err_access_dtor_vbase) 2639 << VBase->getType()); 2640 2641 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2642 } 2643} 2644 2645void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2646 if (!CDtorDecl) 2647 return; 2648 2649 if (CXXConstructorDecl *Constructor 2650 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2651 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2652} 2653 2654bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2655 unsigned DiagID, AbstractDiagSelID SelID) { 2656 if (SelID == -1) 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2658 else 2659 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2660} 2661 2662bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2663 const PartialDiagnostic &PD) { 2664 if (!getLangOptions().CPlusPlus) 2665 return false; 2666 2667 if (const ArrayType *AT = Context.getAsArrayType(T)) 2668 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2669 2670 if (const PointerType *PT = T->getAs<PointerType>()) { 2671 // Find the innermost pointer type. 2672 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2673 PT = T; 2674 2675 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2676 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2677 } 2678 2679 const RecordType *RT = T->getAs<RecordType>(); 2680 if (!RT) 2681 return false; 2682 2683 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2684 2685 // We can't answer whether something is abstract until it has a 2686 // definition. If it's currently being defined, we'll walk back 2687 // over all the declarations when we have a full definition. 2688 const CXXRecordDecl *Def = RD->getDefinition(); 2689 if (!Def || Def->isBeingDefined()) 2690 return false; 2691 2692 if (!RD->isAbstract()) 2693 return false; 2694 2695 Diag(Loc, PD) << RD->getDeclName(); 2696 DiagnoseAbstractType(RD); 2697 2698 return true; 2699} 2700 2701void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2702 // Check if we've already emitted the list of pure virtual functions 2703 // for this class. 2704 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2705 return; 2706 2707 CXXFinalOverriderMap FinalOverriders; 2708 RD->getFinalOverriders(FinalOverriders); 2709 2710 // Keep a set of seen pure methods so we won't diagnose the same method 2711 // more than once. 2712 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2713 2714 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2715 MEnd = FinalOverriders.end(); 2716 M != MEnd; 2717 ++M) { 2718 for (OverridingMethods::iterator SO = M->second.begin(), 2719 SOEnd = M->second.end(); 2720 SO != SOEnd; ++SO) { 2721 // C++ [class.abstract]p4: 2722 // A class is abstract if it contains or inherits at least one 2723 // pure virtual function for which the final overrider is pure 2724 // virtual. 2725 2726 // 2727 if (SO->second.size() != 1) 2728 continue; 2729 2730 if (!SO->second.front().Method->isPure()) 2731 continue; 2732 2733 if (!SeenPureMethods.insert(SO->second.front().Method)) 2734 continue; 2735 2736 Diag(SO->second.front().Method->getLocation(), 2737 diag::note_pure_virtual_function) 2738 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2739 } 2740 } 2741 2742 if (!PureVirtualClassDiagSet) 2743 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2744 PureVirtualClassDiagSet->insert(RD); 2745} 2746 2747namespace { 2748struct AbstractUsageInfo { 2749 Sema &S; 2750 CXXRecordDecl *Record; 2751 CanQualType AbstractType; 2752 bool Invalid; 2753 2754 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2755 : S(S), Record(Record), 2756 AbstractType(S.Context.getCanonicalType( 2757 S.Context.getTypeDeclType(Record))), 2758 Invalid(false) {} 2759 2760 void DiagnoseAbstractType() { 2761 if (Invalid) return; 2762 S.DiagnoseAbstractType(Record); 2763 Invalid = true; 2764 } 2765 2766 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2767}; 2768 2769struct CheckAbstractUsage { 2770 AbstractUsageInfo &Info; 2771 const NamedDecl *Ctx; 2772 2773 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2774 : Info(Info), Ctx(Ctx) {} 2775 2776 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2777 switch (TL.getTypeLocClass()) { 2778#define ABSTRACT_TYPELOC(CLASS, PARENT) 2779#define TYPELOC(CLASS, PARENT) \ 2780 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2781#include "clang/AST/TypeLocNodes.def" 2782 } 2783 } 2784 2785 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2786 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2787 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2788 if (!TL.getArg(I)) 2789 continue; 2790 2791 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2792 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2793 } 2794 } 2795 2796 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2797 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2798 } 2799 2800 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2801 // Visit the type parameters from a permissive context. 2802 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2803 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2804 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2805 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2806 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2807 // TODO: other template argument types? 2808 } 2809 } 2810 2811 // Visit pointee types from a permissive context. 2812#define CheckPolymorphic(Type) \ 2813 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2814 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2815 } 2816 CheckPolymorphic(PointerTypeLoc) 2817 CheckPolymorphic(ReferenceTypeLoc) 2818 CheckPolymorphic(MemberPointerTypeLoc) 2819 CheckPolymorphic(BlockPointerTypeLoc) 2820 2821 /// Handle all the types we haven't given a more specific 2822 /// implementation for above. 2823 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2824 // Every other kind of type that we haven't called out already 2825 // that has an inner type is either (1) sugar or (2) contains that 2826 // inner type in some way as a subobject. 2827 if (TypeLoc Next = TL.getNextTypeLoc()) 2828 return Visit(Next, Sel); 2829 2830 // If there's no inner type and we're in a permissive context, 2831 // don't diagnose. 2832 if (Sel == Sema::AbstractNone) return; 2833 2834 // Check whether the type matches the abstract type. 2835 QualType T = TL.getType(); 2836 if (T->isArrayType()) { 2837 Sel = Sema::AbstractArrayType; 2838 T = Info.S.Context.getBaseElementType(T); 2839 } 2840 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2841 if (CT != Info.AbstractType) return; 2842 2843 // It matched; do some magic. 2844 if (Sel == Sema::AbstractArrayType) { 2845 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2846 << T << TL.getSourceRange(); 2847 } else { 2848 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2849 << Sel << T << TL.getSourceRange(); 2850 } 2851 Info.DiagnoseAbstractType(); 2852 } 2853}; 2854 2855void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2856 Sema::AbstractDiagSelID Sel) { 2857 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2858} 2859 2860} 2861 2862/// Check for invalid uses of an abstract type in a method declaration. 2863static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2864 CXXMethodDecl *MD) { 2865 // No need to do the check on definitions, which require that 2866 // the return/param types be complete. 2867 if (MD->doesThisDeclarationHaveABody()) 2868 return; 2869 2870 // For safety's sake, just ignore it if we don't have type source 2871 // information. This should never happen for non-implicit methods, 2872 // but... 2873 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2874 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2875} 2876 2877/// Check for invalid uses of an abstract type within a class definition. 2878static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2879 CXXRecordDecl *RD) { 2880 for (CXXRecordDecl::decl_iterator 2881 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2882 Decl *D = *I; 2883 if (D->isImplicit()) continue; 2884 2885 // Methods and method templates. 2886 if (isa<CXXMethodDecl>(D)) { 2887 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2888 } else if (isa<FunctionTemplateDecl>(D)) { 2889 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2890 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2891 2892 // Fields and static variables. 2893 } else if (isa<FieldDecl>(D)) { 2894 FieldDecl *FD = cast<FieldDecl>(D); 2895 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2896 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2897 } else if (isa<VarDecl>(D)) { 2898 VarDecl *VD = cast<VarDecl>(D); 2899 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2900 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2901 2902 // Nested classes and class templates. 2903 } else if (isa<CXXRecordDecl>(D)) { 2904 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2905 } else if (isa<ClassTemplateDecl>(D)) { 2906 CheckAbstractClassUsage(Info, 2907 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2908 } 2909 } 2910} 2911 2912/// \brief Perform semantic checks on a class definition that has been 2913/// completing, introducing implicitly-declared members, checking for 2914/// abstract types, etc. 2915void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2916 if (!Record) 2917 return; 2918 2919 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2920 AbstractUsageInfo Info(*this, Record); 2921 CheckAbstractClassUsage(Info, Record); 2922 } 2923 2924 // If this is not an aggregate type and has no user-declared constructor, 2925 // complain about any non-static data members of reference or const scalar 2926 // type, since they will never get initializers. 2927 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2928 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2929 bool Complained = false; 2930 for (RecordDecl::field_iterator F = Record->field_begin(), 2931 FEnd = Record->field_end(); 2932 F != FEnd; ++F) { 2933 if (F->getType()->isReferenceType() || 2934 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2935 if (!Complained) { 2936 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2937 << Record->getTagKind() << Record; 2938 Complained = true; 2939 } 2940 2941 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2942 << F->getType()->isReferenceType() 2943 << F->getDeclName(); 2944 } 2945 } 2946 } 2947 2948 if (Record->isDynamicClass() && !Record->isDependentType()) 2949 DynamicClasses.push_back(Record); 2950 2951 if (Record->getIdentifier()) { 2952 // C++ [class.mem]p13: 2953 // If T is the name of a class, then each of the following shall have a 2954 // name different from T: 2955 // - every member of every anonymous union that is a member of class T. 2956 // 2957 // C++ [class.mem]p14: 2958 // In addition, if class T has a user-declared constructor (12.1), every 2959 // non-static data member of class T shall have a name different from T. 2960 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2961 R.first != R.second; ++R.first) { 2962 NamedDecl *D = *R.first; 2963 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2964 isa<IndirectFieldDecl>(D)) { 2965 Diag(D->getLocation(), diag::err_member_name_of_class) 2966 << D->getDeclName(); 2967 break; 2968 } 2969 } 2970 } 2971 2972 // Warn if the class has virtual methods but non-virtual public destructor. 2973 if (Record->isPolymorphic() && !Record->isDependentType()) { 2974 CXXDestructorDecl *dtor = Record->getDestructor(); 2975 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2976 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2977 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2978 } 2979 2980 // See if a method overloads virtual methods in a base 2981 /// class without overriding any. 2982 if (!Record->isDependentType()) { 2983 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2984 MEnd = Record->method_end(); 2985 M != MEnd; ++M) { 2986 if (!(*M)->isStatic()) 2987 DiagnoseHiddenVirtualMethods(Record, *M); 2988 } 2989 } 2990 2991 // Declare inherited constructors. We do this eagerly here because: 2992 // - The standard requires an eager diagnostic for conflicting inherited 2993 // constructors from different classes. 2994 // - The lazy declaration of the other implicit constructors is so as to not 2995 // waste space and performance on classes that are not meant to be 2996 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2997 // have inherited constructors. 2998 DeclareInheritedConstructors(Record); 2999 3000 // Unfortunately, in C++0x mode, we additionally have to declare all 3001 // implicit members in order to ensure we don't get a horrible evil bad 3002 // infinite recursion from ShouldDelete* 3003 if (getLangOptions().CPlusPlus0x) 3004 ForceDeclarationOfImplicitMembers(Record); 3005 3006 CheckExplicitlyDefaultedMethods(Record); 3007} 3008 3009void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3010 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3011 ME = Record->method_end(); 3012 MI != ME; ++MI) { 3013 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3014 switch (getSpecialMember(*MI)) { 3015 case CXXDefaultConstructor: 3016 CheckExplicitlyDefaultedDefaultConstructor( 3017 cast<CXXConstructorDecl>(*MI)); 3018 break; 3019 3020 case CXXDestructor: 3021 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3022 break; 3023 3024 case CXXCopyConstructor: 3025 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3026 break; 3027 3028 case CXXCopyAssignment: 3029 CheckExplicitlyDefaultedCopyAssignment(*MI); 3030 break; 3031 3032 default: 3033 // FIXME: Do moves once they exist 3034 llvm_unreachable("non-special member explicitly defaulted!"); 3035 } 3036 } 3037 } 3038 3039} 3040 3041void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3042 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3043 3044 // Whether this was the first-declared instance of the constructor. 3045 // This affects whether we implicitly add an exception spec (and, eventually, 3046 // constexpr). It is also ill-formed to explicitly default a constructor such 3047 // that it would be deleted. (C++0x [decl.fct.def.default]) 3048 bool First = CD == CD->getCanonicalDecl(); 3049 3050 bool HadError = false; 3051 if (CD->getNumParams() != 0) { 3052 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3053 << CD->getSourceRange(); 3054 HadError = true; 3055 } 3056 3057 ImplicitExceptionSpecification Spec 3058 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3059 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3060 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3061 *ExceptionType = Context.getFunctionType( 3062 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3063 3064 if (CtorType->hasExceptionSpec()) { 3065 if (CheckEquivalentExceptionSpec( 3066 PDiag(diag::err_incorrect_defaulted_exception_spec) 3067 << 0 /* default constructor */, 3068 PDiag(), 3069 ExceptionType, SourceLocation(), 3070 CtorType, CD->getLocation())) { 3071 HadError = true; 3072 } 3073 } else if (First) { 3074 // We set the declaration to have the computed exception spec here. 3075 // We know there are no parameters. 3076 EPI.ExtInfo = CtorType->getExtInfo(); 3077 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3078 } 3079 3080 if (HadError) { 3081 CD->setInvalidDecl(); 3082 return; 3083 } 3084 3085 if (ShouldDeleteDefaultConstructor(CD)) { 3086 if (First) { 3087 CD->setDeletedAsWritten(); 3088 } else { 3089 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3090 << 0 /* default constructor */; 3091 CD->setInvalidDecl(); 3092 } 3093 } 3094} 3095 3096void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3097 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3098 3099 // Whether this was the first-declared instance of the constructor. 3100 bool First = CD == CD->getCanonicalDecl(); 3101 3102 bool HadError = false; 3103 if (CD->getNumParams() != 1) { 3104 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3105 << CD->getSourceRange(); 3106 HadError = true; 3107 } 3108 3109 ImplicitExceptionSpecification Spec(Context); 3110 bool Const; 3111 llvm::tie(Spec, Const) = 3112 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3113 3114 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3115 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3116 *ExceptionType = Context.getFunctionType( 3117 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3118 3119 // Check for parameter type matching. 3120 // This is a copy ctor so we know it's a cv-qualified reference to T. 3121 QualType ArgType = CtorType->getArgType(0); 3122 if (ArgType->getPointeeType().isVolatileQualified()) { 3123 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3124 HadError = true; 3125 } 3126 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3127 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3128 HadError = true; 3129 } 3130 3131 if (CtorType->hasExceptionSpec()) { 3132 if (CheckEquivalentExceptionSpec( 3133 PDiag(diag::err_incorrect_defaulted_exception_spec) 3134 << 1 /* copy constructor */, 3135 PDiag(), 3136 ExceptionType, SourceLocation(), 3137 CtorType, CD->getLocation())) { 3138 HadError = true; 3139 } 3140 } else if (First) { 3141 // We set the declaration to have the computed exception spec here. 3142 // We duplicate the one parameter type. 3143 EPI.ExtInfo = CtorType->getExtInfo(); 3144 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3145 } 3146 3147 if (HadError) { 3148 CD->setInvalidDecl(); 3149 return; 3150 } 3151 3152 if (ShouldDeleteCopyConstructor(CD)) { 3153 if (First) { 3154 CD->setDeletedAsWritten(); 3155 } else { 3156 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3157 << 1 /* copy constructor */; 3158 CD->setInvalidDecl(); 3159 } 3160 } 3161} 3162 3163void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3164 assert(MD->isExplicitlyDefaulted()); 3165 3166 // Whether this was the first-declared instance of the operator 3167 bool First = MD == MD->getCanonicalDecl(); 3168 3169 bool HadError = false; 3170 if (MD->getNumParams() != 1) { 3171 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3172 << MD->getSourceRange(); 3173 HadError = true; 3174 } 3175 3176 QualType ReturnType = 3177 MD->getType()->getAs<FunctionType>()->getResultType(); 3178 if (!ReturnType->isLValueReferenceType() || 3179 !Context.hasSameType( 3180 Context.getCanonicalType(ReturnType->getPointeeType()), 3181 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3182 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3183 HadError = true; 3184 } 3185 3186 ImplicitExceptionSpecification Spec(Context); 3187 bool Const; 3188 llvm::tie(Spec, Const) = 3189 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3190 3191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3192 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3193 *ExceptionType = Context.getFunctionType( 3194 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3195 3196 QualType ArgType = OperType->getArgType(0); 3197 if (!ArgType->isReferenceType()) { 3198 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3199 HadError = true; 3200 } else { 3201 if (ArgType->getPointeeType().isVolatileQualified()) { 3202 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3203 HadError = true; 3204 } 3205 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3206 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3207 HadError = true; 3208 } 3209 } 3210 3211 if (OperType->getTypeQuals()) { 3212 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3213 HadError = true; 3214 } 3215 3216 if (OperType->hasExceptionSpec()) { 3217 if (CheckEquivalentExceptionSpec( 3218 PDiag(diag::err_incorrect_defaulted_exception_spec) 3219 << 2 /* copy assignment operator */, 3220 PDiag(), 3221 ExceptionType, SourceLocation(), 3222 OperType, MD->getLocation())) { 3223 HadError = true; 3224 } 3225 } else if (First) { 3226 // We set the declaration to have the computed exception spec here. 3227 // We duplicate the one parameter type. 3228 EPI.RefQualifier = OperType->getRefQualifier(); 3229 EPI.ExtInfo = OperType->getExtInfo(); 3230 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3231 } 3232 3233 if (HadError) { 3234 MD->setInvalidDecl(); 3235 return; 3236 } 3237 3238 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3239 if (First) { 3240 MD->setDeletedAsWritten(); 3241 } else { 3242 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3243 << 2 /* copy assignment operator */; 3244 MD->setInvalidDecl(); 3245 } 3246 } 3247} 3248 3249void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3250 assert(DD->isExplicitlyDefaulted()); 3251 3252 // Whether this was the first-declared instance of the destructor. 3253 bool First = DD == DD->getCanonicalDecl(); 3254 3255 ImplicitExceptionSpecification Spec 3256 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3257 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3258 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3259 *ExceptionType = Context.getFunctionType( 3260 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3261 3262 if (DtorType->hasExceptionSpec()) { 3263 if (CheckEquivalentExceptionSpec( 3264 PDiag(diag::err_incorrect_defaulted_exception_spec) 3265 << 3 /* destructor */, 3266 PDiag(), 3267 ExceptionType, SourceLocation(), 3268 DtorType, DD->getLocation())) { 3269 DD->setInvalidDecl(); 3270 return; 3271 } 3272 } else if (First) { 3273 // We set the declaration to have the computed exception spec here. 3274 // There are no parameters. 3275 EPI.ExtInfo = DtorType->getExtInfo(); 3276 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3277 } 3278 3279 if (ShouldDeleteDestructor(DD)) { 3280 if (First) { 3281 DD->setDeletedAsWritten(); 3282 } else { 3283 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3284 << 3 /* destructor */; 3285 DD->setInvalidDecl(); 3286 } 3287 } 3288} 3289 3290bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3291 CXXRecordDecl *RD = CD->getParent(); 3292 assert(!RD->isDependentType() && "do deletion after instantiation"); 3293 if (!LangOpts.CPlusPlus0x) 3294 return false; 3295 3296 SourceLocation Loc = CD->getLocation(); 3297 3298 // Do access control from the constructor 3299 ContextRAII CtorContext(*this, CD); 3300 3301 bool Union = RD->isUnion(); 3302 bool AllConst = true; 3303 3304 // We do this because we should never actually use an anonymous 3305 // union's constructor. 3306 if (Union && RD->isAnonymousStructOrUnion()) 3307 return false; 3308 3309 // FIXME: We should put some diagnostic logic right into this function. 3310 3311 // C++0x [class.ctor]/5 3312 // A defaulted default constructor for class X is defined as delete if: 3313 3314 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3315 BE = RD->bases_end(); 3316 BI != BE; ++BI) { 3317 // We'll handle this one later 3318 if (BI->isVirtual()) 3319 continue; 3320 3321 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3322 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3323 3324 // -- any [direct base class] has a type with a destructor that is 3325 // delete or inaccessible from the defaulted default constructor 3326 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3327 if (BaseDtor->isDeleted()) 3328 return true; 3329 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3330 AR_accessible) 3331 return true; 3332 3333 // -- any [direct base class either] has no default constructor or 3334 // overload resolution as applied to [its] default constructor 3335 // results in an ambiguity or in a function that is deleted or 3336 // inaccessible from the defaulted default constructor 3337 InitializedEntity BaseEntity = 3338 InitializedEntity::InitializeBase(Context, BI, 0); 3339 InitializationKind Kind = 3340 InitializationKind::CreateDirect(Loc, Loc, Loc); 3341 3342 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3343 3344 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3345 return true; 3346 } 3347 3348 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3349 BE = RD->vbases_end(); 3350 BI != BE; ++BI) { 3351 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3352 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3353 3354 // -- any [virtual base class] has a type with a destructor that is 3355 // delete or inaccessible from the defaulted default constructor 3356 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3357 if (BaseDtor->isDeleted()) 3358 return true; 3359 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3360 AR_accessible) 3361 return true; 3362 3363 // -- any [virtual base class either] has no default constructor or 3364 // overload resolution as applied to [its] default constructor 3365 // results in an ambiguity or in a function that is deleted or 3366 // inaccessible from the defaulted default constructor 3367 InitializedEntity BaseEntity = 3368 InitializedEntity::InitializeBase(Context, BI, BI); 3369 InitializationKind Kind = 3370 InitializationKind::CreateDirect(Loc, Loc, Loc); 3371 3372 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3373 3374 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3375 return true; 3376 } 3377 3378 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3379 FE = RD->field_end(); 3380 FI != FE; ++FI) { 3381 QualType FieldType = Context.getBaseElementType(FI->getType()); 3382 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3383 3384 // -- any non-static data member with no brace-or-equal-initializer is of 3385 // reference type 3386 if (FieldType->isReferenceType()) 3387 return true; 3388 3389 // -- X is a union and all its variant members are of const-qualified type 3390 // (or array thereof) 3391 if (Union && !FieldType.isConstQualified()) 3392 AllConst = false; 3393 3394 if (FieldRecord) { 3395 // -- X is a union-like class that has a variant member with a non-trivial 3396 // default constructor 3397 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3398 return true; 3399 3400 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3401 if (FieldDtor->isDeleted()) 3402 return true; 3403 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3404 AR_accessible) 3405 return true; 3406 3407 // -- any non-variant non-static data member of const-qualified type (or 3408 // array thereof) with no brace-or-equal-initializer does not have a 3409 // user-provided default constructor 3410 if (FieldType.isConstQualified() && 3411 !FieldRecord->hasUserProvidedDefaultConstructor()) 3412 return true; 3413 3414 if (!Union && FieldRecord->isUnion() && 3415 FieldRecord->isAnonymousStructOrUnion()) { 3416 // We're okay to reuse AllConst here since we only care about the 3417 // value otherwise if we're in a union. 3418 AllConst = true; 3419 3420 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3421 UE = FieldRecord->field_end(); 3422 UI != UE; ++UI) { 3423 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3424 CXXRecordDecl *UnionFieldRecord = 3425 UnionFieldType->getAsCXXRecordDecl(); 3426 3427 if (!UnionFieldType.isConstQualified()) 3428 AllConst = false; 3429 3430 if (UnionFieldRecord && 3431 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3432 return true; 3433 } 3434 3435 if (AllConst) 3436 return true; 3437 3438 // Don't try to initialize the anonymous union 3439 // This is technically non-conformant, but sanity demands it. 3440 continue; 3441 } 3442 } 3443 3444 InitializedEntity MemberEntity = 3445 InitializedEntity::InitializeMember(*FI, 0); 3446 InitializationKind Kind = 3447 InitializationKind::CreateDirect(Loc, Loc, Loc); 3448 3449 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3450 3451 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3452 return true; 3453 } 3454 3455 if (Union && AllConst) 3456 return true; 3457 3458 return false; 3459} 3460 3461bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3462 CXXRecordDecl *RD = CD->getParent()->getDefinition(); 3463 assert(!RD->isDependentType() && "do deletion after instantiation"); 3464 assert(RD); 3465 assert(CD->getParent() == RD); 3466 if (!LangOpts.CPlusPlus0x) 3467 return false; 3468 3469 SourceLocation Loc = CD->getLocation(); 3470 3471 // Do access control from the constructor 3472 ContextRAII CtorContext(*this, CD); 3473 3474 bool Union = RD->isUnion(); 3475 3476 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3477 "copy assignment arg has no pointee type"); 3478 bool ConstArg = 3479 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3480 3481 // We do this because we should never actually use an anonymous 3482 // union's constructor. 3483 if (Union && RD->isAnonymousStructOrUnion()) 3484 return false; 3485 3486 // FIXME: We should put some diagnostic logic right into this function. 3487 3488 // C++0x [class.copy]/11 3489 // A defaulted [copy] constructor for class X is defined as delete if X has: 3490 3491 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3492 BE = RD->bases_end(); 3493 BI != BE; ++BI) { 3494 // We'll handle this one later 3495 if (BI->isVirtual()) 3496 continue; 3497 3498 QualType BaseType = BI->getType(); 3499 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3500 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3501 3502 // -- any [direct base class] of a type with a destructor that is deleted or 3503 // inaccessible from the defaulted constructor 3504 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3505 if (BaseDtor->isDeleted()) 3506 return true; 3507 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3508 AR_accessible) 3509 return true; 3510 3511 // -- a [direct base class] B that cannot be [copied] because overload 3512 // resolution, as applied to B's [copy] constructor, results in an 3513 // ambiguity or a function that is deleted or inaccessible from the 3514 // defaulted constructor 3515 InitializedEntity BaseEntity = 3516 InitializedEntity::InitializeBase(Context, BI, 0); 3517 InitializationKind Kind = 3518 InitializationKind::CreateDirect(Loc, Loc, Loc); 3519 3520 // Construct a fake expression to perform the copy overloading. 3521 QualType ArgType = BaseType.getUnqualifiedType(); 3522 if (ConstArg) 3523 ArgType.addConst(); 3524 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3525 3526 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3527 3528 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3529 return true; 3530 } 3531 3532 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3533 BE = RD->vbases_end(); 3534 BI != BE; ++BI) { 3535 QualType BaseType = BI->getType(); 3536 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3537 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3538 3539 // -- any [direct base class] of a type with a destructor that is deleted or 3540 // inaccessible from the defaulted constructor 3541 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3542 if (BaseDtor->isDeleted()) 3543 return true; 3544 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3545 AR_accessible) 3546 return true; 3547 3548 // -- a [virtual base class] B that cannot be [copied] because overload 3549 // resolution, as applied to B's [copy] constructor, results in an 3550 // ambiguity or a function that is deleted or inaccessible from the 3551 // defaulted constructor 3552 InitializedEntity BaseEntity = 3553 InitializedEntity::InitializeBase(Context, BI, BI); 3554 InitializationKind Kind = 3555 InitializationKind::CreateDirect(Loc, Loc, Loc); 3556 3557 // Construct a fake expression to perform the copy overloading. 3558 QualType ArgType = BaseType.getUnqualifiedType(); 3559 if (ConstArg) 3560 ArgType.addConst(); 3561 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3562 3563 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3564 3565 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3566 return true; 3567 } 3568 3569 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3570 FE = RD->field_end(); 3571 FI != FE; ++FI) { 3572 QualType FieldType = Context.getBaseElementType(FI->getType()); 3573 3574 // -- for a copy constructor, a non-static data member of rvalue reference 3575 // type 3576 if (FieldType->isRValueReferenceType()) 3577 return true; 3578 3579 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3580 3581 if (FieldRecord) { 3582 // This is an anonymous union 3583 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3584 // Anonymous unions inside unions do not variant members create 3585 if (!Union) { 3586 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3587 UE = FieldRecord->field_end(); 3588 UI != UE; ++UI) { 3589 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3590 CXXRecordDecl *UnionFieldRecord = 3591 UnionFieldType->getAsCXXRecordDecl(); 3592 3593 // -- a variant member with a non-trivial [copy] constructor and X 3594 // is a union-like class 3595 if (UnionFieldRecord && 3596 !UnionFieldRecord->hasTrivialCopyConstructor()) 3597 return true; 3598 } 3599 } 3600 3601 // Don't try to initalize an anonymous union 3602 continue; 3603 } else { 3604 // -- a variant member with a non-trivial [copy] constructor and X is a 3605 // union-like class 3606 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3607 return true; 3608 3609 // -- any [non-static data member] of a type with a destructor that is 3610 // deleted or inaccessible from the defaulted constructor 3611 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3612 if (FieldDtor->isDeleted()) 3613 return true; 3614 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3615 AR_accessible) 3616 return true; 3617 } 3618 } 3619 3620 llvm::SmallVector<InitializedEntity, 4> Entities; 3621 QualType CurType = FI->getType(); 3622 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3623 while (CurType->isArrayType()) { 3624 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3625 Entities.back())); 3626 CurType = Context.getAsArrayType(CurType)->getElementType(); 3627 } 3628 3629 InitializationKind Kind = 3630 InitializationKind::CreateDirect(Loc, Loc, Loc); 3631 3632 // Construct a fake expression to perform the copy overloading. 3633 QualType ArgType = FieldType; 3634 if (ArgType->isReferenceType()) 3635 ArgType = ArgType->getPointeeType(); 3636 else if (ConstArg) 3637 ArgType.addConst(); 3638 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3639 3640 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3641 3642 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3643 return true; 3644 } 3645 3646 return false; 3647} 3648 3649bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3650 CXXRecordDecl *RD = MD->getParent(); 3651 assert(!RD->isDependentType() && "do deletion after instantiation"); 3652 if (!LangOpts.CPlusPlus0x) 3653 return false; 3654 3655 SourceLocation Loc = MD->getLocation(); 3656 3657 // Do access control from the constructor 3658 ContextRAII MethodContext(*this, MD); 3659 3660 bool Union = RD->isUnion(); 3661 3662 bool ConstArg = 3663 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3664 3665 // We do this because we should never actually use an anonymous 3666 // union's constructor. 3667 if (Union && RD->isAnonymousStructOrUnion()) 3668 return false; 3669 3670 DeclarationName OperatorName = 3671 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3672 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3673 R.suppressDiagnostics(); 3674 3675 // FIXME: We should put some diagnostic logic right into this function. 3676 3677 // C++0x [class.copy]/11 3678 // A defaulted [copy] assignment operator for class X is defined as deleted 3679 // if X has: 3680 3681 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3682 BE = RD->bases_end(); 3683 BI != BE; ++BI) { 3684 // We'll handle this one later 3685 if (BI->isVirtual()) 3686 continue; 3687 3688 QualType BaseType = BI->getType(); 3689 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3690 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3691 3692 // -- a [direct base class] B that cannot be [copied] because overload 3693 // resolution, as applied to B's [copy] assignment operator, results in 3694 // an ambiguity or a function that is deleted or inaccessible from the 3695 // assignment operator 3696 3697 LookupQualifiedName(R, BaseDecl, false); 3698 3699 // Filter out any result that isn't a copy-assignment operator. 3700 LookupResult::Filter F = R.makeFilter(); 3701 while (F.hasNext()) { 3702 NamedDecl *D = F.next(); 3703 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3704 if (Method->isCopyAssignmentOperator()) 3705 continue; 3706 3707 F.erase(); 3708 } 3709 F.done(); 3710 3711 // Build a fake argument expression 3712 QualType ArgType = BaseType; 3713 QualType ThisType = BaseType; 3714 if (ConstArg) 3715 ArgType.addConst(); 3716 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3717 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3718 }; 3719 3720 OverloadCandidateSet OCS((Loc)); 3721 OverloadCandidateSet::iterator Best; 3722 3723 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3724 3725 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3726 OR_Success) 3727 return true; 3728 } 3729 3730 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3731 BE = RD->vbases_end(); 3732 BI != BE; ++BI) { 3733 QualType BaseType = BI->getType(); 3734 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3735 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3736 3737 // -- a [virtual base class] B that cannot be [copied] because overload 3738 // resolution, as applied to B's [copy] assignment operator, results in 3739 // an ambiguity or a function that is deleted or inaccessible from the 3740 // assignment operator 3741 3742 LookupQualifiedName(R, BaseDecl, false); 3743 3744 // Filter out any result that isn't a copy-assignment operator. 3745 LookupResult::Filter F = R.makeFilter(); 3746 while (F.hasNext()) { 3747 NamedDecl *D = F.next(); 3748 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3749 if (Method->isCopyAssignmentOperator()) 3750 continue; 3751 3752 F.erase(); 3753 } 3754 F.done(); 3755 3756 // Build a fake argument expression 3757 QualType ArgType = BaseType; 3758 QualType ThisType = BaseType; 3759 if (ConstArg) 3760 ArgType.addConst(); 3761 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3762 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3763 }; 3764 3765 OverloadCandidateSet OCS((Loc)); 3766 OverloadCandidateSet::iterator Best; 3767 3768 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3769 3770 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3771 OR_Success) 3772 return true; 3773 } 3774 3775 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3776 FE = RD->field_end(); 3777 FI != FE; ++FI) { 3778 QualType FieldType = Context.getBaseElementType(FI->getType()); 3779 3780 // -- a non-static data member of reference type 3781 if (FieldType->isReferenceType()) 3782 return true; 3783 3784 // -- a non-static data member of const non-class type (or array thereof) 3785 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3786 return true; 3787 3788 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3789 3790 if (FieldRecord) { 3791 // This is an anonymous union 3792 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3793 // Anonymous unions inside unions do not variant members create 3794 if (!Union) { 3795 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3796 UE = FieldRecord->field_end(); 3797 UI != UE; ++UI) { 3798 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3799 CXXRecordDecl *UnionFieldRecord = 3800 UnionFieldType->getAsCXXRecordDecl(); 3801 3802 // -- a variant member with a non-trivial [copy] assignment operator 3803 // and X is a union-like class 3804 if (UnionFieldRecord && 3805 !UnionFieldRecord->hasTrivialCopyAssignment()) 3806 return true; 3807 } 3808 } 3809 3810 // Don't try to initalize an anonymous union 3811 continue; 3812 // -- a variant member with a non-trivial [copy] assignment operator 3813 // and X is a union-like class 3814 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3815 return true; 3816 } 3817 3818 LookupQualifiedName(R, FieldRecord, false); 3819 3820 // Filter out any result that isn't a copy-assignment operator. 3821 LookupResult::Filter F = R.makeFilter(); 3822 while (F.hasNext()) { 3823 NamedDecl *D = F.next(); 3824 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3825 if (Method->isCopyAssignmentOperator()) 3826 continue; 3827 3828 F.erase(); 3829 } 3830 F.done(); 3831 3832 // Build a fake argument expression 3833 QualType ArgType = FieldType; 3834 QualType ThisType = FieldType; 3835 if (ConstArg) 3836 ArgType.addConst(); 3837 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3838 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3839 }; 3840 3841 OverloadCandidateSet OCS((Loc)); 3842 OverloadCandidateSet::iterator Best; 3843 3844 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3845 3846 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3847 OR_Success) 3848 return true; 3849 } 3850 } 3851 3852 return false; 3853} 3854 3855bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3856 CXXRecordDecl *RD = DD->getParent(); 3857 assert(!RD->isDependentType() && "do deletion after instantiation"); 3858 if (!LangOpts.CPlusPlus0x) 3859 return false; 3860 3861 SourceLocation Loc = DD->getLocation(); 3862 3863 // Do access control from the destructor 3864 ContextRAII CtorContext(*this, DD); 3865 3866 bool Union = RD->isUnion(); 3867 3868 // We do this because we should never actually use an anonymous 3869 // union's destructor. 3870 if (Union && RD->isAnonymousStructOrUnion()) 3871 return false; 3872 3873 // C++0x [class.dtor]p5 3874 // A defaulted destructor for a class X is defined as deleted if: 3875 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3876 BE = RD->bases_end(); 3877 BI != BE; ++BI) { 3878 // We'll handle this one later 3879 if (BI->isVirtual()) 3880 continue; 3881 3882 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3883 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3884 assert(BaseDtor && "base has no destructor"); 3885 3886 // -- any direct or virtual base class has a deleted destructor or 3887 // a destructor that is inaccessible from the defaulted destructor 3888 if (BaseDtor->isDeleted()) 3889 return true; 3890 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3891 AR_accessible) 3892 return true; 3893 } 3894 3895 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3896 BE = RD->vbases_end(); 3897 BI != BE; ++BI) { 3898 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3899 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3900 assert(BaseDtor && "base has no destructor"); 3901 3902 // -- any direct or virtual base class has a deleted destructor or 3903 // a destructor that is inaccessible from the defaulted destructor 3904 if (BaseDtor->isDeleted()) 3905 return true; 3906 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3907 AR_accessible) 3908 return true; 3909 } 3910 3911 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3912 FE = RD->field_end(); 3913 FI != FE; ++FI) { 3914 QualType FieldType = Context.getBaseElementType(FI->getType()); 3915 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3916 if (FieldRecord) { 3917 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3918 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3919 UE = FieldRecord->field_end(); 3920 UI != UE; ++UI) { 3921 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3922 CXXRecordDecl *UnionFieldRecord = 3923 UnionFieldType->getAsCXXRecordDecl(); 3924 3925 // -- X is a union-like class that has a variant member with a non- 3926 // trivial destructor. 3927 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3928 return true; 3929 } 3930 // Technically we are supposed to do this next check unconditionally. 3931 // But that makes absolutely no sense. 3932 } else { 3933 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3934 3935 // -- any of the non-static data members has class type M (or array 3936 // thereof) and M has a deleted destructor or a destructor that is 3937 // inaccessible from the defaulted destructor 3938 if (FieldDtor->isDeleted()) 3939 return true; 3940 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3941 AR_accessible) 3942 return true; 3943 3944 // -- X is a union-like class that has a variant member with a non- 3945 // trivial destructor. 3946 if (Union && !FieldDtor->isTrivial()) 3947 return true; 3948 } 3949 } 3950 } 3951 3952 if (DD->isVirtual()) { 3953 FunctionDecl *OperatorDelete = 0; 3954 DeclarationName Name = 3955 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3956 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3957 false)) 3958 return true; 3959 } 3960 3961 3962 return false; 3963} 3964 3965/// \brief Data used with FindHiddenVirtualMethod 3966namespace { 3967 struct FindHiddenVirtualMethodData { 3968 Sema *S; 3969 CXXMethodDecl *Method; 3970 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3971 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3972 }; 3973} 3974 3975/// \brief Member lookup function that determines whether a given C++ 3976/// method overloads virtual methods in a base class without overriding any, 3977/// to be used with CXXRecordDecl::lookupInBases(). 3978static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3979 CXXBasePath &Path, 3980 void *UserData) { 3981 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3982 3983 FindHiddenVirtualMethodData &Data 3984 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3985 3986 DeclarationName Name = Data.Method->getDeclName(); 3987 assert(Name.getNameKind() == DeclarationName::Identifier); 3988 3989 bool foundSameNameMethod = false; 3990 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3991 for (Path.Decls = BaseRecord->lookup(Name); 3992 Path.Decls.first != Path.Decls.second; 3993 ++Path.Decls.first) { 3994 NamedDecl *D = *Path.Decls.first; 3995 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3996 MD = MD->getCanonicalDecl(); 3997 foundSameNameMethod = true; 3998 // Interested only in hidden virtual methods. 3999 if (!MD->isVirtual()) 4000 continue; 4001 // If the method we are checking overrides a method from its base 4002 // don't warn about the other overloaded methods. 4003 if (!Data.S->IsOverload(Data.Method, MD, false)) 4004 return true; 4005 // Collect the overload only if its hidden. 4006 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4007 overloadedMethods.push_back(MD); 4008 } 4009 } 4010 4011 if (foundSameNameMethod) 4012 Data.OverloadedMethods.append(overloadedMethods.begin(), 4013 overloadedMethods.end()); 4014 return foundSameNameMethod; 4015} 4016 4017/// \brief See if a method overloads virtual methods in a base class without 4018/// overriding any. 4019void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4020 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4021 MD->getLocation()) == Diagnostic::Ignored) 4022 return; 4023 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4024 return; 4025 4026 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4027 /*bool RecordPaths=*/false, 4028 /*bool DetectVirtual=*/false); 4029 FindHiddenVirtualMethodData Data; 4030 Data.Method = MD; 4031 Data.S = this; 4032 4033 // Keep the base methods that were overriden or introduced in the subclass 4034 // by 'using' in a set. A base method not in this set is hidden. 4035 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4036 res.first != res.second; ++res.first) { 4037 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4038 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4039 E = MD->end_overridden_methods(); 4040 I != E; ++I) 4041 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4042 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4043 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4044 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4045 } 4046 4047 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4048 !Data.OverloadedMethods.empty()) { 4049 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4050 << MD << (Data.OverloadedMethods.size() > 1); 4051 4052 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4053 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4054 Diag(overloadedMD->getLocation(), 4055 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4056 } 4057 } 4058} 4059 4060void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4061 Decl *TagDecl, 4062 SourceLocation LBrac, 4063 SourceLocation RBrac, 4064 AttributeList *AttrList) { 4065 if (!TagDecl) 4066 return; 4067 4068 AdjustDeclIfTemplate(TagDecl); 4069 4070 ActOnFields(S, RLoc, TagDecl, 4071 // strict aliasing violation! 4072 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4073 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4074 4075 CheckCompletedCXXClass( 4076 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4077} 4078 4079/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4080/// special functions, such as the default constructor, copy 4081/// constructor, or destructor, to the given C++ class (C++ 4082/// [special]p1). This routine can only be executed just before the 4083/// definition of the class is complete. 4084void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4085 if (!ClassDecl->hasUserDeclaredConstructor()) 4086 ++ASTContext::NumImplicitDefaultConstructors; 4087 4088 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4089 ++ASTContext::NumImplicitCopyConstructors; 4090 4091 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4092 ++ASTContext::NumImplicitCopyAssignmentOperators; 4093 4094 // If we have a dynamic class, then the copy assignment operator may be 4095 // virtual, so we have to declare it immediately. This ensures that, e.g., 4096 // it shows up in the right place in the vtable and that we diagnose 4097 // problems with the implicit exception specification. 4098 if (ClassDecl->isDynamicClass()) 4099 DeclareImplicitCopyAssignment(ClassDecl); 4100 } 4101 4102 if (!ClassDecl->hasUserDeclaredDestructor()) { 4103 ++ASTContext::NumImplicitDestructors; 4104 4105 // If we have a dynamic class, then the destructor may be virtual, so we 4106 // have to declare the destructor immediately. This ensures that, e.g., it 4107 // shows up in the right place in the vtable and that we diagnose problems 4108 // with the implicit exception specification. 4109 if (ClassDecl->isDynamicClass()) 4110 DeclareImplicitDestructor(ClassDecl); 4111 } 4112} 4113 4114void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4115 if (!D) 4116 return; 4117 4118 int NumParamList = D->getNumTemplateParameterLists(); 4119 for (int i = 0; i < NumParamList; i++) { 4120 TemplateParameterList* Params = D->getTemplateParameterList(i); 4121 for (TemplateParameterList::iterator Param = Params->begin(), 4122 ParamEnd = Params->end(); 4123 Param != ParamEnd; ++Param) { 4124 NamedDecl *Named = cast<NamedDecl>(*Param); 4125 if (Named->getDeclName()) { 4126 S->AddDecl(Named); 4127 IdResolver.AddDecl(Named); 4128 } 4129 } 4130 } 4131} 4132 4133void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4134 if (!D) 4135 return; 4136 4137 TemplateParameterList *Params = 0; 4138 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4139 Params = Template->getTemplateParameters(); 4140 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4141 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4142 Params = PartialSpec->getTemplateParameters(); 4143 else 4144 return; 4145 4146 for (TemplateParameterList::iterator Param = Params->begin(), 4147 ParamEnd = Params->end(); 4148 Param != ParamEnd; ++Param) { 4149 NamedDecl *Named = cast<NamedDecl>(*Param); 4150 if (Named->getDeclName()) { 4151 S->AddDecl(Named); 4152 IdResolver.AddDecl(Named); 4153 } 4154 } 4155} 4156 4157void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4158 if (!RecordD) return; 4159 AdjustDeclIfTemplate(RecordD); 4160 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4161 PushDeclContext(S, Record); 4162} 4163 4164void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4165 if (!RecordD) return; 4166 PopDeclContext(); 4167} 4168 4169/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4170/// parsing a top-level (non-nested) C++ class, and we are now 4171/// parsing those parts of the given Method declaration that could 4172/// not be parsed earlier (C++ [class.mem]p2), such as default 4173/// arguments. This action should enter the scope of the given 4174/// Method declaration as if we had just parsed the qualified method 4175/// name. However, it should not bring the parameters into scope; 4176/// that will be performed by ActOnDelayedCXXMethodParameter. 4177void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4178} 4179 4180/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4181/// C++ method declaration. We're (re-)introducing the given 4182/// function parameter into scope for use in parsing later parts of 4183/// the method declaration. For example, we could see an 4184/// ActOnParamDefaultArgument event for this parameter. 4185void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4186 if (!ParamD) 4187 return; 4188 4189 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4190 4191 // If this parameter has an unparsed default argument, clear it out 4192 // to make way for the parsed default argument. 4193 if (Param->hasUnparsedDefaultArg()) 4194 Param->setDefaultArg(0); 4195 4196 S->AddDecl(Param); 4197 if (Param->getDeclName()) 4198 IdResolver.AddDecl(Param); 4199} 4200 4201/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4202/// processing the delayed method declaration for Method. The method 4203/// declaration is now considered finished. There may be a separate 4204/// ActOnStartOfFunctionDef action later (not necessarily 4205/// immediately!) for this method, if it was also defined inside the 4206/// class body. 4207void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4208 if (!MethodD) 4209 return; 4210 4211 AdjustDeclIfTemplate(MethodD); 4212 4213 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4214 4215 // Now that we have our default arguments, check the constructor 4216 // again. It could produce additional diagnostics or affect whether 4217 // the class has implicitly-declared destructors, among other 4218 // things. 4219 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4220 CheckConstructor(Constructor); 4221 4222 // Check the default arguments, which we may have added. 4223 if (!Method->isInvalidDecl()) 4224 CheckCXXDefaultArguments(Method); 4225} 4226 4227/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4228/// the well-formedness of the constructor declarator @p D with type @p 4229/// R. If there are any errors in the declarator, this routine will 4230/// emit diagnostics and set the invalid bit to true. In any case, the type 4231/// will be updated to reflect a well-formed type for the constructor and 4232/// returned. 4233QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4234 StorageClass &SC) { 4235 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4236 4237 // C++ [class.ctor]p3: 4238 // A constructor shall not be virtual (10.3) or static (9.4). A 4239 // constructor can be invoked for a const, volatile or const 4240 // volatile object. A constructor shall not be declared const, 4241 // volatile, or const volatile (9.3.2). 4242 if (isVirtual) { 4243 if (!D.isInvalidType()) 4244 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4245 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4246 << SourceRange(D.getIdentifierLoc()); 4247 D.setInvalidType(); 4248 } 4249 if (SC == SC_Static) { 4250 if (!D.isInvalidType()) 4251 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4252 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4253 << SourceRange(D.getIdentifierLoc()); 4254 D.setInvalidType(); 4255 SC = SC_None; 4256 } 4257 4258 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4259 if (FTI.TypeQuals != 0) { 4260 if (FTI.TypeQuals & Qualifiers::Const) 4261 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4262 << "const" << SourceRange(D.getIdentifierLoc()); 4263 if (FTI.TypeQuals & Qualifiers::Volatile) 4264 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4265 << "volatile" << SourceRange(D.getIdentifierLoc()); 4266 if (FTI.TypeQuals & Qualifiers::Restrict) 4267 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4268 << "restrict" << SourceRange(D.getIdentifierLoc()); 4269 D.setInvalidType(); 4270 } 4271 4272 // C++0x [class.ctor]p4: 4273 // A constructor shall not be declared with a ref-qualifier. 4274 if (FTI.hasRefQualifier()) { 4275 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4276 << FTI.RefQualifierIsLValueRef 4277 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4278 D.setInvalidType(); 4279 } 4280 4281 // Rebuild the function type "R" without any type qualifiers (in 4282 // case any of the errors above fired) and with "void" as the 4283 // return type, since constructors don't have return types. 4284 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4285 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4286 return R; 4287 4288 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4289 EPI.TypeQuals = 0; 4290 EPI.RefQualifier = RQ_None; 4291 4292 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4293 Proto->getNumArgs(), EPI); 4294} 4295 4296/// CheckConstructor - Checks a fully-formed constructor for 4297/// well-formedness, issuing any diagnostics required. Returns true if 4298/// the constructor declarator is invalid. 4299void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4300 CXXRecordDecl *ClassDecl 4301 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4302 if (!ClassDecl) 4303 return Constructor->setInvalidDecl(); 4304 4305 // C++ [class.copy]p3: 4306 // A declaration of a constructor for a class X is ill-formed if 4307 // its first parameter is of type (optionally cv-qualified) X and 4308 // either there are no other parameters or else all other 4309 // parameters have default arguments. 4310 if (!Constructor->isInvalidDecl() && 4311 ((Constructor->getNumParams() == 1) || 4312 (Constructor->getNumParams() > 1 && 4313 Constructor->getParamDecl(1)->hasDefaultArg())) && 4314 Constructor->getTemplateSpecializationKind() 4315 != TSK_ImplicitInstantiation) { 4316 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4317 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4318 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4319 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4320 const char *ConstRef 4321 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4322 : " const &"; 4323 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4324 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4325 4326 // FIXME: Rather that making the constructor invalid, we should endeavor 4327 // to fix the type. 4328 Constructor->setInvalidDecl(); 4329 } 4330 } 4331} 4332 4333/// CheckDestructor - Checks a fully-formed destructor definition for 4334/// well-formedness, issuing any diagnostics required. Returns true 4335/// on error. 4336bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4337 CXXRecordDecl *RD = Destructor->getParent(); 4338 4339 if (Destructor->isVirtual()) { 4340 SourceLocation Loc; 4341 4342 if (!Destructor->isImplicit()) 4343 Loc = Destructor->getLocation(); 4344 else 4345 Loc = RD->getLocation(); 4346 4347 // If we have a virtual destructor, look up the deallocation function 4348 FunctionDecl *OperatorDelete = 0; 4349 DeclarationName Name = 4350 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4351 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4352 return true; 4353 4354 MarkDeclarationReferenced(Loc, OperatorDelete); 4355 4356 Destructor->setOperatorDelete(OperatorDelete); 4357 } 4358 4359 return false; 4360} 4361 4362static inline bool 4363FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4364 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4365 FTI.ArgInfo[0].Param && 4366 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4367} 4368 4369/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4370/// the well-formednes of the destructor declarator @p D with type @p 4371/// R. If there are any errors in the declarator, this routine will 4372/// emit diagnostics and set the declarator to invalid. Even if this happens, 4373/// will be updated to reflect a well-formed type for the destructor and 4374/// returned. 4375QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4376 StorageClass& SC) { 4377 // C++ [class.dtor]p1: 4378 // [...] A typedef-name that names a class is a class-name 4379 // (7.1.3); however, a typedef-name that names a class shall not 4380 // be used as the identifier in the declarator for a destructor 4381 // declaration. 4382 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4383 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4384 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4385 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4386 else if (const TemplateSpecializationType *TST = 4387 DeclaratorType->getAs<TemplateSpecializationType>()) 4388 if (TST->isTypeAlias()) 4389 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4390 << DeclaratorType << 1; 4391 4392 // C++ [class.dtor]p2: 4393 // A destructor is used to destroy objects of its class type. A 4394 // destructor takes no parameters, and no return type can be 4395 // specified for it (not even void). The address of a destructor 4396 // shall not be taken. A destructor shall not be static. A 4397 // destructor can be invoked for a const, volatile or const 4398 // volatile object. A destructor shall not be declared const, 4399 // volatile or const volatile (9.3.2). 4400 if (SC == SC_Static) { 4401 if (!D.isInvalidType()) 4402 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4403 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4404 << SourceRange(D.getIdentifierLoc()) 4405 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4406 4407 SC = SC_None; 4408 } 4409 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4410 // Destructors don't have return types, but the parser will 4411 // happily parse something like: 4412 // 4413 // class X { 4414 // float ~X(); 4415 // }; 4416 // 4417 // The return type will be eliminated later. 4418 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4419 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4420 << SourceRange(D.getIdentifierLoc()); 4421 } 4422 4423 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4424 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4425 if (FTI.TypeQuals & Qualifiers::Const) 4426 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4427 << "const" << SourceRange(D.getIdentifierLoc()); 4428 if (FTI.TypeQuals & Qualifiers::Volatile) 4429 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4430 << "volatile" << SourceRange(D.getIdentifierLoc()); 4431 if (FTI.TypeQuals & Qualifiers::Restrict) 4432 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4433 << "restrict" << SourceRange(D.getIdentifierLoc()); 4434 D.setInvalidType(); 4435 } 4436 4437 // C++0x [class.dtor]p2: 4438 // A destructor shall not be declared with a ref-qualifier. 4439 if (FTI.hasRefQualifier()) { 4440 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4441 << FTI.RefQualifierIsLValueRef 4442 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4443 D.setInvalidType(); 4444 } 4445 4446 // Make sure we don't have any parameters. 4447 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4448 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4449 4450 // Delete the parameters. 4451 FTI.freeArgs(); 4452 D.setInvalidType(); 4453 } 4454 4455 // Make sure the destructor isn't variadic. 4456 if (FTI.isVariadic) { 4457 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4458 D.setInvalidType(); 4459 } 4460 4461 // Rebuild the function type "R" without any type qualifiers or 4462 // parameters (in case any of the errors above fired) and with 4463 // "void" as the return type, since destructors don't have return 4464 // types. 4465 if (!D.isInvalidType()) 4466 return R; 4467 4468 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4469 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4470 EPI.Variadic = false; 4471 EPI.TypeQuals = 0; 4472 EPI.RefQualifier = RQ_None; 4473 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4474} 4475 4476/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4477/// well-formednes of the conversion function declarator @p D with 4478/// type @p R. If there are any errors in the declarator, this routine 4479/// will emit diagnostics and return true. Otherwise, it will return 4480/// false. Either way, the type @p R will be updated to reflect a 4481/// well-formed type for the conversion operator. 4482void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4483 StorageClass& SC) { 4484 // C++ [class.conv.fct]p1: 4485 // Neither parameter types nor return type can be specified. The 4486 // type of a conversion function (8.3.5) is "function taking no 4487 // parameter returning conversion-type-id." 4488 if (SC == SC_Static) { 4489 if (!D.isInvalidType()) 4490 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4491 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4492 << SourceRange(D.getIdentifierLoc()); 4493 D.setInvalidType(); 4494 SC = SC_None; 4495 } 4496 4497 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4498 4499 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4500 // Conversion functions don't have return types, but the parser will 4501 // happily parse something like: 4502 // 4503 // class X { 4504 // float operator bool(); 4505 // }; 4506 // 4507 // The return type will be changed later anyway. 4508 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4509 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4510 << SourceRange(D.getIdentifierLoc()); 4511 D.setInvalidType(); 4512 } 4513 4514 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4515 4516 // Make sure we don't have any parameters. 4517 if (Proto->getNumArgs() > 0) { 4518 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4519 4520 // Delete the parameters. 4521 D.getFunctionTypeInfo().freeArgs(); 4522 D.setInvalidType(); 4523 } else if (Proto->isVariadic()) { 4524 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4525 D.setInvalidType(); 4526 } 4527 4528 // Diagnose "&operator bool()" and other such nonsense. This 4529 // is actually a gcc extension which we don't support. 4530 if (Proto->getResultType() != ConvType) { 4531 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4532 << Proto->getResultType(); 4533 D.setInvalidType(); 4534 ConvType = Proto->getResultType(); 4535 } 4536 4537 // C++ [class.conv.fct]p4: 4538 // The conversion-type-id shall not represent a function type nor 4539 // an array type. 4540 if (ConvType->isArrayType()) { 4541 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4542 ConvType = Context.getPointerType(ConvType); 4543 D.setInvalidType(); 4544 } else if (ConvType->isFunctionType()) { 4545 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4546 ConvType = Context.getPointerType(ConvType); 4547 D.setInvalidType(); 4548 } 4549 4550 // Rebuild the function type "R" without any parameters (in case any 4551 // of the errors above fired) and with the conversion type as the 4552 // return type. 4553 if (D.isInvalidType()) 4554 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4555 4556 // C++0x explicit conversion operators. 4557 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4558 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4559 diag::warn_explicit_conversion_functions) 4560 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4561} 4562 4563/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4564/// the declaration of the given C++ conversion function. This routine 4565/// is responsible for recording the conversion function in the C++ 4566/// class, if possible. 4567Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4568 assert(Conversion && "Expected to receive a conversion function declaration"); 4569 4570 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4571 4572 // Make sure we aren't redeclaring the conversion function. 4573 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4574 4575 // C++ [class.conv.fct]p1: 4576 // [...] A conversion function is never used to convert a 4577 // (possibly cv-qualified) object to the (possibly cv-qualified) 4578 // same object type (or a reference to it), to a (possibly 4579 // cv-qualified) base class of that type (or a reference to it), 4580 // or to (possibly cv-qualified) void. 4581 // FIXME: Suppress this warning if the conversion function ends up being a 4582 // virtual function that overrides a virtual function in a base class. 4583 QualType ClassType 4584 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4585 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4586 ConvType = ConvTypeRef->getPointeeType(); 4587 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4588 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4589 /* Suppress diagnostics for instantiations. */; 4590 else if (ConvType->isRecordType()) { 4591 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4592 if (ConvType == ClassType) 4593 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4594 << ClassType; 4595 else if (IsDerivedFrom(ClassType, ConvType)) 4596 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4597 << ClassType << ConvType; 4598 } else if (ConvType->isVoidType()) { 4599 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4600 << ClassType << ConvType; 4601 } 4602 4603 if (FunctionTemplateDecl *ConversionTemplate 4604 = Conversion->getDescribedFunctionTemplate()) 4605 return ConversionTemplate; 4606 4607 return Conversion; 4608} 4609 4610//===----------------------------------------------------------------------===// 4611// Namespace Handling 4612//===----------------------------------------------------------------------===// 4613 4614 4615 4616/// ActOnStartNamespaceDef - This is called at the start of a namespace 4617/// definition. 4618Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4619 SourceLocation InlineLoc, 4620 SourceLocation NamespaceLoc, 4621 SourceLocation IdentLoc, 4622 IdentifierInfo *II, 4623 SourceLocation LBrace, 4624 AttributeList *AttrList) { 4625 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4626 // For anonymous namespace, take the location of the left brace. 4627 SourceLocation Loc = II ? IdentLoc : LBrace; 4628 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4629 StartLoc, Loc, II); 4630 Namespc->setInline(InlineLoc.isValid()); 4631 4632 Scope *DeclRegionScope = NamespcScope->getParent(); 4633 4634 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4635 4636 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4637 PushNamespaceVisibilityAttr(Attr); 4638 4639 if (II) { 4640 // C++ [namespace.def]p2: 4641 // The identifier in an original-namespace-definition shall not 4642 // have been previously defined in the declarative region in 4643 // which the original-namespace-definition appears. The 4644 // identifier in an original-namespace-definition is the name of 4645 // the namespace. Subsequently in that declarative region, it is 4646 // treated as an original-namespace-name. 4647 // 4648 // Since namespace names are unique in their scope, and we don't 4649 // look through using directives, just look for any ordinary names. 4650 4651 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4652 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4653 Decl::IDNS_Namespace; 4654 NamedDecl *PrevDecl = 0; 4655 for (DeclContext::lookup_result R 4656 = CurContext->getRedeclContext()->lookup(II); 4657 R.first != R.second; ++R.first) { 4658 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4659 PrevDecl = *R.first; 4660 break; 4661 } 4662 } 4663 4664 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4665 // This is an extended namespace definition. 4666 if (Namespc->isInline() != OrigNS->isInline()) { 4667 // inline-ness must match 4668 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4669 << Namespc->isInline(); 4670 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4671 Namespc->setInvalidDecl(); 4672 // Recover by ignoring the new namespace's inline status. 4673 Namespc->setInline(OrigNS->isInline()); 4674 } 4675 4676 // Attach this namespace decl to the chain of extended namespace 4677 // definitions. 4678 OrigNS->setNextNamespace(Namespc); 4679 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4680 4681 // Remove the previous declaration from the scope. 4682 if (DeclRegionScope->isDeclScope(OrigNS)) { 4683 IdResolver.RemoveDecl(OrigNS); 4684 DeclRegionScope->RemoveDecl(OrigNS); 4685 } 4686 } else if (PrevDecl) { 4687 // This is an invalid name redefinition. 4688 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4689 << Namespc->getDeclName(); 4690 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4691 Namespc->setInvalidDecl(); 4692 // Continue on to push Namespc as current DeclContext and return it. 4693 } else if (II->isStr("std") && 4694 CurContext->getRedeclContext()->isTranslationUnit()) { 4695 // This is the first "real" definition of the namespace "std", so update 4696 // our cache of the "std" namespace to point at this definition. 4697 if (NamespaceDecl *StdNS = getStdNamespace()) { 4698 // We had already defined a dummy namespace "std". Link this new 4699 // namespace definition to the dummy namespace "std". 4700 StdNS->setNextNamespace(Namespc); 4701 StdNS->setLocation(IdentLoc); 4702 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4703 } 4704 4705 // Make our StdNamespace cache point at the first real definition of the 4706 // "std" namespace. 4707 StdNamespace = Namespc; 4708 } 4709 4710 PushOnScopeChains(Namespc, DeclRegionScope); 4711 } else { 4712 // Anonymous namespaces. 4713 assert(Namespc->isAnonymousNamespace()); 4714 4715 // Link the anonymous namespace into its parent. 4716 NamespaceDecl *PrevDecl; 4717 DeclContext *Parent = CurContext->getRedeclContext(); 4718 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4719 PrevDecl = TU->getAnonymousNamespace(); 4720 TU->setAnonymousNamespace(Namespc); 4721 } else { 4722 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4723 PrevDecl = ND->getAnonymousNamespace(); 4724 ND->setAnonymousNamespace(Namespc); 4725 } 4726 4727 // Link the anonymous namespace with its previous declaration. 4728 if (PrevDecl) { 4729 assert(PrevDecl->isAnonymousNamespace()); 4730 assert(!PrevDecl->getNextNamespace()); 4731 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4732 PrevDecl->setNextNamespace(Namespc); 4733 4734 if (Namespc->isInline() != PrevDecl->isInline()) { 4735 // inline-ness must match 4736 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4737 << Namespc->isInline(); 4738 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4739 Namespc->setInvalidDecl(); 4740 // Recover by ignoring the new namespace's inline status. 4741 Namespc->setInline(PrevDecl->isInline()); 4742 } 4743 } 4744 4745 CurContext->addDecl(Namespc); 4746 4747 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4748 // behaves as if it were replaced by 4749 // namespace unique { /* empty body */ } 4750 // using namespace unique; 4751 // namespace unique { namespace-body } 4752 // where all occurrences of 'unique' in a translation unit are 4753 // replaced by the same identifier and this identifier differs 4754 // from all other identifiers in the entire program. 4755 4756 // We just create the namespace with an empty name and then add an 4757 // implicit using declaration, just like the standard suggests. 4758 // 4759 // CodeGen enforces the "universally unique" aspect by giving all 4760 // declarations semantically contained within an anonymous 4761 // namespace internal linkage. 4762 4763 if (!PrevDecl) { 4764 UsingDirectiveDecl* UD 4765 = UsingDirectiveDecl::Create(Context, CurContext, 4766 /* 'using' */ LBrace, 4767 /* 'namespace' */ SourceLocation(), 4768 /* qualifier */ NestedNameSpecifierLoc(), 4769 /* identifier */ SourceLocation(), 4770 Namespc, 4771 /* Ancestor */ CurContext); 4772 UD->setImplicit(); 4773 CurContext->addDecl(UD); 4774 } 4775 } 4776 4777 // Although we could have an invalid decl (i.e. the namespace name is a 4778 // redefinition), push it as current DeclContext and try to continue parsing. 4779 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4780 // for the namespace has the declarations that showed up in that particular 4781 // namespace definition. 4782 PushDeclContext(NamespcScope, Namespc); 4783 return Namespc; 4784} 4785 4786/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4787/// is a namespace alias, returns the namespace it points to. 4788static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4789 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4790 return AD->getNamespace(); 4791 return dyn_cast_or_null<NamespaceDecl>(D); 4792} 4793 4794/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4795/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4796void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4797 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4798 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4799 Namespc->setRBraceLoc(RBrace); 4800 PopDeclContext(); 4801 if (Namespc->hasAttr<VisibilityAttr>()) 4802 PopPragmaVisibility(); 4803} 4804 4805CXXRecordDecl *Sema::getStdBadAlloc() const { 4806 return cast_or_null<CXXRecordDecl>( 4807 StdBadAlloc.get(Context.getExternalSource())); 4808} 4809 4810NamespaceDecl *Sema::getStdNamespace() const { 4811 return cast_or_null<NamespaceDecl>( 4812 StdNamespace.get(Context.getExternalSource())); 4813} 4814 4815/// \brief Retrieve the special "std" namespace, which may require us to 4816/// implicitly define the namespace. 4817NamespaceDecl *Sema::getOrCreateStdNamespace() { 4818 if (!StdNamespace) { 4819 // The "std" namespace has not yet been defined, so build one implicitly. 4820 StdNamespace = NamespaceDecl::Create(Context, 4821 Context.getTranslationUnitDecl(), 4822 SourceLocation(), SourceLocation(), 4823 &PP.getIdentifierTable().get("std")); 4824 getStdNamespace()->setImplicit(true); 4825 } 4826 4827 return getStdNamespace(); 4828} 4829 4830/// \brief Determine whether a using statement is in a context where it will be 4831/// apply in all contexts. 4832static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4833 switch (CurContext->getDeclKind()) { 4834 case Decl::TranslationUnit: 4835 return true; 4836 case Decl::LinkageSpec: 4837 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4838 default: 4839 return false; 4840 } 4841} 4842 4843Decl *Sema::ActOnUsingDirective(Scope *S, 4844 SourceLocation UsingLoc, 4845 SourceLocation NamespcLoc, 4846 CXXScopeSpec &SS, 4847 SourceLocation IdentLoc, 4848 IdentifierInfo *NamespcName, 4849 AttributeList *AttrList) { 4850 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4851 assert(NamespcName && "Invalid NamespcName."); 4852 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4853 4854 // This can only happen along a recovery path. 4855 while (S->getFlags() & Scope::TemplateParamScope) 4856 S = S->getParent(); 4857 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4858 4859 UsingDirectiveDecl *UDir = 0; 4860 NestedNameSpecifier *Qualifier = 0; 4861 if (SS.isSet()) 4862 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4863 4864 // Lookup namespace name. 4865 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4866 LookupParsedName(R, S, &SS); 4867 if (R.isAmbiguous()) 4868 return 0; 4869 4870 if (R.empty()) { 4871 // Allow "using namespace std;" or "using namespace ::std;" even if 4872 // "std" hasn't been defined yet, for GCC compatibility. 4873 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4874 NamespcName->isStr("std")) { 4875 Diag(IdentLoc, diag::ext_using_undefined_std); 4876 R.addDecl(getOrCreateStdNamespace()); 4877 R.resolveKind(); 4878 } 4879 // Otherwise, attempt typo correction. 4880 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4881 CTC_NoKeywords, 0)) { 4882 if (R.getAsSingle<NamespaceDecl>() || 4883 R.getAsSingle<NamespaceAliasDecl>()) { 4884 if (DeclContext *DC = computeDeclContext(SS, false)) 4885 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4886 << NamespcName << DC << Corrected << SS.getRange() 4887 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4888 else 4889 Diag(IdentLoc, diag::err_using_directive_suggest) 4890 << NamespcName << Corrected 4891 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4892 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4893 << Corrected; 4894 4895 NamespcName = Corrected.getAsIdentifierInfo(); 4896 } else { 4897 R.clear(); 4898 R.setLookupName(NamespcName); 4899 } 4900 } 4901 } 4902 4903 if (!R.empty()) { 4904 NamedDecl *Named = R.getFoundDecl(); 4905 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4906 && "expected namespace decl"); 4907 // C++ [namespace.udir]p1: 4908 // A using-directive specifies that the names in the nominated 4909 // namespace can be used in the scope in which the 4910 // using-directive appears after the using-directive. During 4911 // unqualified name lookup (3.4.1), the names appear as if they 4912 // were declared in the nearest enclosing namespace which 4913 // contains both the using-directive and the nominated 4914 // namespace. [Note: in this context, "contains" means "contains 4915 // directly or indirectly". ] 4916 4917 // Find enclosing context containing both using-directive and 4918 // nominated namespace. 4919 NamespaceDecl *NS = getNamespaceDecl(Named); 4920 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4921 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4922 CommonAncestor = CommonAncestor->getParent(); 4923 4924 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4925 SS.getWithLocInContext(Context), 4926 IdentLoc, Named, CommonAncestor); 4927 4928 if (IsUsingDirectiveInToplevelContext(CurContext) && 4929 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4930 Diag(IdentLoc, diag::warn_using_directive_in_header); 4931 } 4932 4933 PushUsingDirective(S, UDir); 4934 } else { 4935 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4936 } 4937 4938 // FIXME: We ignore attributes for now. 4939 return UDir; 4940} 4941 4942void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4943 // If scope has associated entity, then using directive is at namespace 4944 // or translation unit scope. We add UsingDirectiveDecls, into 4945 // it's lookup structure. 4946 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4947 Ctx->addDecl(UDir); 4948 else 4949 // Otherwise it is block-sope. using-directives will affect lookup 4950 // only to the end of scope. 4951 S->PushUsingDirective(UDir); 4952} 4953 4954 4955Decl *Sema::ActOnUsingDeclaration(Scope *S, 4956 AccessSpecifier AS, 4957 bool HasUsingKeyword, 4958 SourceLocation UsingLoc, 4959 CXXScopeSpec &SS, 4960 UnqualifiedId &Name, 4961 AttributeList *AttrList, 4962 bool IsTypeName, 4963 SourceLocation TypenameLoc) { 4964 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4965 4966 switch (Name.getKind()) { 4967 case UnqualifiedId::IK_Identifier: 4968 case UnqualifiedId::IK_OperatorFunctionId: 4969 case UnqualifiedId::IK_LiteralOperatorId: 4970 case UnqualifiedId::IK_ConversionFunctionId: 4971 break; 4972 4973 case UnqualifiedId::IK_ConstructorName: 4974 case UnqualifiedId::IK_ConstructorTemplateId: 4975 // C++0x inherited constructors. 4976 if (getLangOptions().CPlusPlus0x) break; 4977 4978 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4979 << SS.getRange(); 4980 return 0; 4981 4982 case UnqualifiedId::IK_DestructorName: 4983 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4984 << SS.getRange(); 4985 return 0; 4986 4987 case UnqualifiedId::IK_TemplateId: 4988 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4989 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4990 return 0; 4991 } 4992 4993 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4994 DeclarationName TargetName = TargetNameInfo.getName(); 4995 if (!TargetName) 4996 return 0; 4997 4998 // Warn about using declarations. 4999 // TODO: store that the declaration was written without 'using' and 5000 // talk about access decls instead of using decls in the 5001 // diagnostics. 5002 if (!HasUsingKeyword) { 5003 UsingLoc = Name.getSourceRange().getBegin(); 5004 5005 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5006 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5007 } 5008 5009 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5010 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5011 return 0; 5012 5013 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5014 TargetNameInfo, AttrList, 5015 /* IsInstantiation */ false, 5016 IsTypeName, TypenameLoc); 5017 if (UD) 5018 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5019 5020 return UD; 5021} 5022 5023/// \brief Determine whether a using declaration considers the given 5024/// declarations as "equivalent", e.g., if they are redeclarations of 5025/// the same entity or are both typedefs of the same type. 5026static bool 5027IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5028 bool &SuppressRedeclaration) { 5029 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5030 SuppressRedeclaration = false; 5031 return true; 5032 } 5033 5034 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5035 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5036 SuppressRedeclaration = true; 5037 return Context.hasSameType(TD1->getUnderlyingType(), 5038 TD2->getUnderlyingType()); 5039 } 5040 5041 return false; 5042} 5043 5044 5045/// Determines whether to create a using shadow decl for a particular 5046/// decl, given the set of decls existing prior to this using lookup. 5047bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5048 const LookupResult &Previous) { 5049 // Diagnose finding a decl which is not from a base class of the 5050 // current class. We do this now because there are cases where this 5051 // function will silently decide not to build a shadow decl, which 5052 // will pre-empt further diagnostics. 5053 // 5054 // We don't need to do this in C++0x because we do the check once on 5055 // the qualifier. 5056 // 5057 // FIXME: diagnose the following if we care enough: 5058 // struct A { int foo; }; 5059 // struct B : A { using A::foo; }; 5060 // template <class T> struct C : A {}; 5061 // template <class T> struct D : C<T> { using B::foo; } // <--- 5062 // This is invalid (during instantiation) in C++03 because B::foo 5063 // resolves to the using decl in B, which is not a base class of D<T>. 5064 // We can't diagnose it immediately because C<T> is an unknown 5065 // specialization. The UsingShadowDecl in D<T> then points directly 5066 // to A::foo, which will look well-formed when we instantiate. 5067 // The right solution is to not collapse the shadow-decl chain. 5068 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5069 DeclContext *OrigDC = Orig->getDeclContext(); 5070 5071 // Handle enums and anonymous structs. 5072 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5073 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5074 while (OrigRec->isAnonymousStructOrUnion()) 5075 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5076 5077 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5078 if (OrigDC == CurContext) { 5079 Diag(Using->getLocation(), 5080 diag::err_using_decl_nested_name_specifier_is_current_class) 5081 << Using->getQualifierLoc().getSourceRange(); 5082 Diag(Orig->getLocation(), diag::note_using_decl_target); 5083 return true; 5084 } 5085 5086 Diag(Using->getQualifierLoc().getBeginLoc(), 5087 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5088 << Using->getQualifier() 5089 << cast<CXXRecordDecl>(CurContext) 5090 << Using->getQualifierLoc().getSourceRange(); 5091 Diag(Orig->getLocation(), diag::note_using_decl_target); 5092 return true; 5093 } 5094 } 5095 5096 if (Previous.empty()) return false; 5097 5098 NamedDecl *Target = Orig; 5099 if (isa<UsingShadowDecl>(Target)) 5100 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5101 5102 // If the target happens to be one of the previous declarations, we 5103 // don't have a conflict. 5104 // 5105 // FIXME: but we might be increasing its access, in which case we 5106 // should redeclare it. 5107 NamedDecl *NonTag = 0, *Tag = 0; 5108 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5109 I != E; ++I) { 5110 NamedDecl *D = (*I)->getUnderlyingDecl(); 5111 bool Result; 5112 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5113 return Result; 5114 5115 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5116 } 5117 5118 if (Target->isFunctionOrFunctionTemplate()) { 5119 FunctionDecl *FD; 5120 if (isa<FunctionTemplateDecl>(Target)) 5121 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5122 else 5123 FD = cast<FunctionDecl>(Target); 5124 5125 NamedDecl *OldDecl = 0; 5126 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5127 case Ovl_Overload: 5128 return false; 5129 5130 case Ovl_NonFunction: 5131 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5132 break; 5133 5134 // We found a decl with the exact signature. 5135 case Ovl_Match: 5136 // If we're in a record, we want to hide the target, so we 5137 // return true (without a diagnostic) to tell the caller not to 5138 // build a shadow decl. 5139 if (CurContext->isRecord()) 5140 return true; 5141 5142 // If we're not in a record, this is an error. 5143 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5144 break; 5145 } 5146 5147 Diag(Target->getLocation(), diag::note_using_decl_target); 5148 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5149 return true; 5150 } 5151 5152 // Target is not a function. 5153 5154 if (isa<TagDecl>(Target)) { 5155 // No conflict between a tag and a non-tag. 5156 if (!Tag) return false; 5157 5158 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5159 Diag(Target->getLocation(), diag::note_using_decl_target); 5160 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5161 return true; 5162 } 5163 5164 // No conflict between a tag and a non-tag. 5165 if (!NonTag) return false; 5166 5167 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5168 Diag(Target->getLocation(), diag::note_using_decl_target); 5169 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5170 return true; 5171} 5172 5173/// Builds a shadow declaration corresponding to a 'using' declaration. 5174UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5175 UsingDecl *UD, 5176 NamedDecl *Orig) { 5177 5178 // If we resolved to another shadow declaration, just coalesce them. 5179 NamedDecl *Target = Orig; 5180 if (isa<UsingShadowDecl>(Target)) { 5181 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5182 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5183 } 5184 5185 UsingShadowDecl *Shadow 5186 = UsingShadowDecl::Create(Context, CurContext, 5187 UD->getLocation(), UD, Target); 5188 UD->addShadowDecl(Shadow); 5189 5190 Shadow->setAccess(UD->getAccess()); 5191 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5192 Shadow->setInvalidDecl(); 5193 5194 if (S) 5195 PushOnScopeChains(Shadow, S); 5196 else 5197 CurContext->addDecl(Shadow); 5198 5199 5200 return Shadow; 5201} 5202 5203/// Hides a using shadow declaration. This is required by the current 5204/// using-decl implementation when a resolvable using declaration in a 5205/// class is followed by a declaration which would hide or override 5206/// one or more of the using decl's targets; for example: 5207/// 5208/// struct Base { void foo(int); }; 5209/// struct Derived : Base { 5210/// using Base::foo; 5211/// void foo(int); 5212/// }; 5213/// 5214/// The governing language is C++03 [namespace.udecl]p12: 5215/// 5216/// When a using-declaration brings names from a base class into a 5217/// derived class scope, member functions in the derived class 5218/// override and/or hide member functions with the same name and 5219/// parameter types in a base class (rather than conflicting). 5220/// 5221/// There are two ways to implement this: 5222/// (1) optimistically create shadow decls when they're not hidden 5223/// by existing declarations, or 5224/// (2) don't create any shadow decls (or at least don't make them 5225/// visible) until we've fully parsed/instantiated the class. 5226/// The problem with (1) is that we might have to retroactively remove 5227/// a shadow decl, which requires several O(n) operations because the 5228/// decl structures are (very reasonably) not designed for removal. 5229/// (2) avoids this but is very fiddly and phase-dependent. 5230void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5231 if (Shadow->getDeclName().getNameKind() == 5232 DeclarationName::CXXConversionFunctionName) 5233 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5234 5235 // Remove it from the DeclContext... 5236 Shadow->getDeclContext()->removeDecl(Shadow); 5237 5238 // ...and the scope, if applicable... 5239 if (S) { 5240 S->RemoveDecl(Shadow); 5241 IdResolver.RemoveDecl(Shadow); 5242 } 5243 5244 // ...and the using decl. 5245 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5246 5247 // TODO: complain somehow if Shadow was used. It shouldn't 5248 // be possible for this to happen, because...? 5249} 5250 5251/// Builds a using declaration. 5252/// 5253/// \param IsInstantiation - Whether this call arises from an 5254/// instantiation of an unresolved using declaration. We treat 5255/// the lookup differently for these declarations. 5256NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5257 SourceLocation UsingLoc, 5258 CXXScopeSpec &SS, 5259 const DeclarationNameInfo &NameInfo, 5260 AttributeList *AttrList, 5261 bool IsInstantiation, 5262 bool IsTypeName, 5263 SourceLocation TypenameLoc) { 5264 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5265 SourceLocation IdentLoc = NameInfo.getLoc(); 5266 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5267 5268 // FIXME: We ignore attributes for now. 5269 5270 if (SS.isEmpty()) { 5271 Diag(IdentLoc, diag::err_using_requires_qualname); 5272 return 0; 5273 } 5274 5275 // Do the redeclaration lookup in the current scope. 5276 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5277 ForRedeclaration); 5278 Previous.setHideTags(false); 5279 if (S) { 5280 LookupName(Previous, S); 5281 5282 // It is really dumb that we have to do this. 5283 LookupResult::Filter F = Previous.makeFilter(); 5284 while (F.hasNext()) { 5285 NamedDecl *D = F.next(); 5286 if (!isDeclInScope(D, CurContext, S)) 5287 F.erase(); 5288 } 5289 F.done(); 5290 } else { 5291 assert(IsInstantiation && "no scope in non-instantiation"); 5292 assert(CurContext->isRecord() && "scope not record in instantiation"); 5293 LookupQualifiedName(Previous, CurContext); 5294 } 5295 5296 // Check for invalid redeclarations. 5297 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5298 return 0; 5299 5300 // Check for bad qualifiers. 5301 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5302 return 0; 5303 5304 DeclContext *LookupContext = computeDeclContext(SS); 5305 NamedDecl *D; 5306 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5307 if (!LookupContext) { 5308 if (IsTypeName) { 5309 // FIXME: not all declaration name kinds are legal here 5310 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5311 UsingLoc, TypenameLoc, 5312 QualifierLoc, 5313 IdentLoc, NameInfo.getName()); 5314 } else { 5315 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5316 QualifierLoc, NameInfo); 5317 } 5318 } else { 5319 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5320 NameInfo, IsTypeName); 5321 } 5322 D->setAccess(AS); 5323 CurContext->addDecl(D); 5324 5325 if (!LookupContext) return D; 5326 UsingDecl *UD = cast<UsingDecl>(D); 5327 5328 if (RequireCompleteDeclContext(SS, LookupContext)) { 5329 UD->setInvalidDecl(); 5330 return UD; 5331 } 5332 5333 // Constructor inheriting using decls get special treatment. 5334 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5335 if (CheckInheritedConstructorUsingDecl(UD)) 5336 UD->setInvalidDecl(); 5337 return UD; 5338 } 5339 5340 // Otherwise, look up the target name. 5341 5342 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5343 5344 // Unlike most lookups, we don't always want to hide tag 5345 // declarations: tag names are visible through the using declaration 5346 // even if hidden by ordinary names, *except* in a dependent context 5347 // where it's important for the sanity of two-phase lookup. 5348 if (!IsInstantiation) 5349 R.setHideTags(false); 5350 5351 LookupQualifiedName(R, LookupContext); 5352 5353 if (R.empty()) { 5354 Diag(IdentLoc, diag::err_no_member) 5355 << NameInfo.getName() << LookupContext << SS.getRange(); 5356 UD->setInvalidDecl(); 5357 return UD; 5358 } 5359 5360 if (R.isAmbiguous()) { 5361 UD->setInvalidDecl(); 5362 return UD; 5363 } 5364 5365 if (IsTypeName) { 5366 // If we asked for a typename and got a non-type decl, error out. 5367 if (!R.getAsSingle<TypeDecl>()) { 5368 Diag(IdentLoc, diag::err_using_typename_non_type); 5369 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5370 Diag((*I)->getUnderlyingDecl()->getLocation(), 5371 diag::note_using_decl_target); 5372 UD->setInvalidDecl(); 5373 return UD; 5374 } 5375 } else { 5376 // If we asked for a non-typename and we got a type, error out, 5377 // but only if this is an instantiation of an unresolved using 5378 // decl. Otherwise just silently find the type name. 5379 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5380 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5381 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5382 UD->setInvalidDecl(); 5383 return UD; 5384 } 5385 } 5386 5387 // C++0x N2914 [namespace.udecl]p6: 5388 // A using-declaration shall not name a namespace. 5389 if (R.getAsSingle<NamespaceDecl>()) { 5390 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5391 << SS.getRange(); 5392 UD->setInvalidDecl(); 5393 return UD; 5394 } 5395 5396 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5397 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5398 BuildUsingShadowDecl(S, UD, *I); 5399 } 5400 5401 return UD; 5402} 5403 5404/// Additional checks for a using declaration referring to a constructor name. 5405bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5406 if (UD->isTypeName()) { 5407 // FIXME: Cannot specify typename when specifying constructor 5408 return true; 5409 } 5410 5411 const Type *SourceType = UD->getQualifier()->getAsType(); 5412 assert(SourceType && 5413 "Using decl naming constructor doesn't have type in scope spec."); 5414 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5415 5416 // Check whether the named type is a direct base class. 5417 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5418 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5419 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5420 BaseIt != BaseE; ++BaseIt) { 5421 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5422 if (CanonicalSourceType == BaseType) 5423 break; 5424 } 5425 5426 if (BaseIt == BaseE) { 5427 // Did not find SourceType in the bases. 5428 Diag(UD->getUsingLocation(), 5429 diag::err_using_decl_constructor_not_in_direct_base) 5430 << UD->getNameInfo().getSourceRange() 5431 << QualType(SourceType, 0) << TargetClass; 5432 return true; 5433 } 5434 5435 BaseIt->setInheritConstructors(); 5436 5437 return false; 5438} 5439 5440/// Checks that the given using declaration is not an invalid 5441/// redeclaration. Note that this is checking only for the using decl 5442/// itself, not for any ill-formedness among the UsingShadowDecls. 5443bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5444 bool isTypeName, 5445 const CXXScopeSpec &SS, 5446 SourceLocation NameLoc, 5447 const LookupResult &Prev) { 5448 // C++03 [namespace.udecl]p8: 5449 // C++0x [namespace.udecl]p10: 5450 // A using-declaration is a declaration and can therefore be used 5451 // repeatedly where (and only where) multiple declarations are 5452 // allowed. 5453 // 5454 // That's in non-member contexts. 5455 if (!CurContext->getRedeclContext()->isRecord()) 5456 return false; 5457 5458 NestedNameSpecifier *Qual 5459 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5460 5461 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5462 NamedDecl *D = *I; 5463 5464 bool DTypename; 5465 NestedNameSpecifier *DQual; 5466 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5467 DTypename = UD->isTypeName(); 5468 DQual = UD->getQualifier(); 5469 } else if (UnresolvedUsingValueDecl *UD 5470 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5471 DTypename = false; 5472 DQual = UD->getQualifier(); 5473 } else if (UnresolvedUsingTypenameDecl *UD 5474 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5475 DTypename = true; 5476 DQual = UD->getQualifier(); 5477 } else continue; 5478 5479 // using decls differ if one says 'typename' and the other doesn't. 5480 // FIXME: non-dependent using decls? 5481 if (isTypeName != DTypename) continue; 5482 5483 // using decls differ if they name different scopes (but note that 5484 // template instantiation can cause this check to trigger when it 5485 // didn't before instantiation). 5486 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5487 Context.getCanonicalNestedNameSpecifier(DQual)) 5488 continue; 5489 5490 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5491 Diag(D->getLocation(), diag::note_using_decl) << 1; 5492 return true; 5493 } 5494 5495 return false; 5496} 5497 5498 5499/// Checks that the given nested-name qualifier used in a using decl 5500/// in the current context is appropriately related to the current 5501/// scope. If an error is found, diagnoses it and returns true. 5502bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5503 const CXXScopeSpec &SS, 5504 SourceLocation NameLoc) { 5505 DeclContext *NamedContext = computeDeclContext(SS); 5506 5507 if (!CurContext->isRecord()) { 5508 // C++03 [namespace.udecl]p3: 5509 // C++0x [namespace.udecl]p8: 5510 // A using-declaration for a class member shall be a member-declaration. 5511 5512 // If we weren't able to compute a valid scope, it must be a 5513 // dependent class scope. 5514 if (!NamedContext || NamedContext->isRecord()) { 5515 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5516 << SS.getRange(); 5517 return true; 5518 } 5519 5520 // Otherwise, everything is known to be fine. 5521 return false; 5522 } 5523 5524 // The current scope is a record. 5525 5526 // If the named context is dependent, we can't decide much. 5527 if (!NamedContext) { 5528 // FIXME: in C++0x, we can diagnose if we can prove that the 5529 // nested-name-specifier does not refer to a base class, which is 5530 // still possible in some cases. 5531 5532 // Otherwise we have to conservatively report that things might be 5533 // okay. 5534 return false; 5535 } 5536 5537 if (!NamedContext->isRecord()) { 5538 // Ideally this would point at the last name in the specifier, 5539 // but we don't have that level of source info. 5540 Diag(SS.getRange().getBegin(), 5541 diag::err_using_decl_nested_name_specifier_is_not_class) 5542 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5543 return true; 5544 } 5545 5546 if (!NamedContext->isDependentContext() && 5547 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5548 return true; 5549 5550 if (getLangOptions().CPlusPlus0x) { 5551 // C++0x [namespace.udecl]p3: 5552 // In a using-declaration used as a member-declaration, the 5553 // nested-name-specifier shall name a base class of the class 5554 // being defined. 5555 5556 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5557 cast<CXXRecordDecl>(NamedContext))) { 5558 if (CurContext == NamedContext) { 5559 Diag(NameLoc, 5560 diag::err_using_decl_nested_name_specifier_is_current_class) 5561 << SS.getRange(); 5562 return true; 5563 } 5564 5565 Diag(SS.getRange().getBegin(), 5566 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5567 << (NestedNameSpecifier*) SS.getScopeRep() 5568 << cast<CXXRecordDecl>(CurContext) 5569 << SS.getRange(); 5570 return true; 5571 } 5572 5573 return false; 5574 } 5575 5576 // C++03 [namespace.udecl]p4: 5577 // A using-declaration used as a member-declaration shall refer 5578 // to a member of a base class of the class being defined [etc.]. 5579 5580 // Salient point: SS doesn't have to name a base class as long as 5581 // lookup only finds members from base classes. Therefore we can 5582 // diagnose here only if we can prove that that can't happen, 5583 // i.e. if the class hierarchies provably don't intersect. 5584 5585 // TODO: it would be nice if "definitely valid" results were cached 5586 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5587 // need to be repeated. 5588 5589 struct UserData { 5590 llvm::DenseSet<const CXXRecordDecl*> Bases; 5591 5592 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5593 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5594 Data->Bases.insert(Base); 5595 return true; 5596 } 5597 5598 bool hasDependentBases(const CXXRecordDecl *Class) { 5599 return !Class->forallBases(collect, this); 5600 } 5601 5602 /// Returns true if the base is dependent or is one of the 5603 /// accumulated base classes. 5604 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5605 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5606 return !Data->Bases.count(Base); 5607 } 5608 5609 bool mightShareBases(const CXXRecordDecl *Class) { 5610 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5611 } 5612 }; 5613 5614 UserData Data; 5615 5616 // Returns false if we find a dependent base. 5617 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5618 return false; 5619 5620 // Returns false if the class has a dependent base or if it or one 5621 // of its bases is present in the base set of the current context. 5622 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5623 return false; 5624 5625 Diag(SS.getRange().getBegin(), 5626 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5627 << (NestedNameSpecifier*) SS.getScopeRep() 5628 << cast<CXXRecordDecl>(CurContext) 5629 << SS.getRange(); 5630 5631 return true; 5632} 5633 5634Decl *Sema::ActOnAliasDeclaration(Scope *S, 5635 AccessSpecifier AS, 5636 MultiTemplateParamsArg TemplateParamLists, 5637 SourceLocation UsingLoc, 5638 UnqualifiedId &Name, 5639 TypeResult Type) { 5640 // Skip up to the relevant declaration scope. 5641 while (S->getFlags() & Scope::TemplateParamScope) 5642 S = S->getParent(); 5643 assert((S->getFlags() & Scope::DeclScope) && 5644 "got alias-declaration outside of declaration scope"); 5645 5646 if (Type.isInvalid()) 5647 return 0; 5648 5649 bool Invalid = false; 5650 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5651 TypeSourceInfo *TInfo = 0; 5652 GetTypeFromParser(Type.get(), &TInfo); 5653 5654 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5655 return 0; 5656 5657 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5658 UPPC_DeclarationType)) { 5659 Invalid = true; 5660 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5661 TInfo->getTypeLoc().getBeginLoc()); 5662 } 5663 5664 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5665 LookupName(Previous, S); 5666 5667 // Warn about shadowing the name of a template parameter. 5668 if (Previous.isSingleResult() && 5669 Previous.getFoundDecl()->isTemplateParameter()) { 5670 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5671 Previous.getFoundDecl())) 5672 Invalid = true; 5673 Previous.clear(); 5674 } 5675 5676 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5677 "name in alias declaration must be an identifier"); 5678 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5679 Name.StartLocation, 5680 Name.Identifier, TInfo); 5681 5682 NewTD->setAccess(AS); 5683 5684 if (Invalid) 5685 NewTD->setInvalidDecl(); 5686 5687 CheckTypedefForVariablyModifiedType(S, NewTD); 5688 Invalid |= NewTD->isInvalidDecl(); 5689 5690 bool Redeclaration = false; 5691 5692 NamedDecl *NewND; 5693 if (TemplateParamLists.size()) { 5694 TypeAliasTemplateDecl *OldDecl = 0; 5695 TemplateParameterList *OldTemplateParams = 0; 5696 5697 if (TemplateParamLists.size() != 1) { 5698 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5699 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5700 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5701 } 5702 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5703 5704 // Only consider previous declarations in the same scope. 5705 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5706 /*ExplicitInstantiationOrSpecialization*/false); 5707 if (!Previous.empty()) { 5708 Redeclaration = true; 5709 5710 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5711 if (!OldDecl && !Invalid) { 5712 Diag(UsingLoc, diag::err_redefinition_different_kind) 5713 << Name.Identifier; 5714 5715 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5716 if (OldD->getLocation().isValid()) 5717 Diag(OldD->getLocation(), diag::note_previous_definition); 5718 5719 Invalid = true; 5720 } 5721 5722 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5723 if (TemplateParameterListsAreEqual(TemplateParams, 5724 OldDecl->getTemplateParameters(), 5725 /*Complain=*/true, 5726 TPL_TemplateMatch)) 5727 OldTemplateParams = OldDecl->getTemplateParameters(); 5728 else 5729 Invalid = true; 5730 5731 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5732 if (!Invalid && 5733 !Context.hasSameType(OldTD->getUnderlyingType(), 5734 NewTD->getUnderlyingType())) { 5735 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5736 // but we can't reasonably accept it. 5737 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5738 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5739 if (OldTD->getLocation().isValid()) 5740 Diag(OldTD->getLocation(), diag::note_previous_definition); 5741 Invalid = true; 5742 } 5743 } 5744 } 5745 5746 // Merge any previous default template arguments into our parameters, 5747 // and check the parameter list. 5748 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5749 TPC_TypeAliasTemplate)) 5750 return 0; 5751 5752 TypeAliasTemplateDecl *NewDecl = 5753 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5754 Name.Identifier, TemplateParams, 5755 NewTD); 5756 5757 NewDecl->setAccess(AS); 5758 5759 if (Invalid) 5760 NewDecl->setInvalidDecl(); 5761 else if (OldDecl) 5762 NewDecl->setPreviousDeclaration(OldDecl); 5763 5764 NewND = NewDecl; 5765 } else { 5766 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5767 NewND = NewTD; 5768 } 5769 5770 if (!Redeclaration) 5771 PushOnScopeChains(NewND, S); 5772 5773 return NewND; 5774} 5775 5776Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5777 SourceLocation NamespaceLoc, 5778 SourceLocation AliasLoc, 5779 IdentifierInfo *Alias, 5780 CXXScopeSpec &SS, 5781 SourceLocation IdentLoc, 5782 IdentifierInfo *Ident) { 5783 5784 // Lookup the namespace name. 5785 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5786 LookupParsedName(R, S, &SS); 5787 5788 // Check if we have a previous declaration with the same name. 5789 NamedDecl *PrevDecl 5790 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5791 ForRedeclaration); 5792 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5793 PrevDecl = 0; 5794 5795 if (PrevDecl) { 5796 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5797 // We already have an alias with the same name that points to the same 5798 // namespace, so don't create a new one. 5799 // FIXME: At some point, we'll want to create the (redundant) 5800 // declaration to maintain better source information. 5801 if (!R.isAmbiguous() && !R.empty() && 5802 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5803 return 0; 5804 } 5805 5806 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5807 diag::err_redefinition_different_kind; 5808 Diag(AliasLoc, DiagID) << Alias; 5809 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5810 return 0; 5811 } 5812 5813 if (R.isAmbiguous()) 5814 return 0; 5815 5816 if (R.empty()) { 5817 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5818 CTC_NoKeywords, 0)) { 5819 if (R.getAsSingle<NamespaceDecl>() || 5820 R.getAsSingle<NamespaceAliasDecl>()) { 5821 if (DeclContext *DC = computeDeclContext(SS, false)) 5822 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5823 << Ident << DC << Corrected << SS.getRange() 5824 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5825 else 5826 Diag(IdentLoc, diag::err_using_directive_suggest) 5827 << Ident << Corrected 5828 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5829 5830 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5831 << Corrected; 5832 5833 Ident = Corrected.getAsIdentifierInfo(); 5834 } else { 5835 R.clear(); 5836 R.setLookupName(Ident); 5837 } 5838 } 5839 5840 if (R.empty()) { 5841 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5842 return 0; 5843 } 5844 } 5845 5846 NamespaceAliasDecl *AliasDecl = 5847 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5848 Alias, SS.getWithLocInContext(Context), 5849 IdentLoc, R.getFoundDecl()); 5850 5851 PushOnScopeChains(AliasDecl, S); 5852 return AliasDecl; 5853} 5854 5855namespace { 5856 /// \brief Scoped object used to handle the state changes required in Sema 5857 /// to implicitly define the body of a C++ member function; 5858 class ImplicitlyDefinedFunctionScope { 5859 Sema &S; 5860 Sema::ContextRAII SavedContext; 5861 5862 public: 5863 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5864 : S(S), SavedContext(S, Method) 5865 { 5866 S.PushFunctionScope(); 5867 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5868 } 5869 5870 ~ImplicitlyDefinedFunctionScope() { 5871 S.PopExpressionEvaluationContext(); 5872 S.PopFunctionOrBlockScope(); 5873 } 5874 }; 5875} 5876 5877static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5878 CXXRecordDecl *D) { 5879 ASTContext &Context = Self.Context; 5880 QualType ClassType = Context.getTypeDeclType(D); 5881 DeclarationName ConstructorName 5882 = Context.DeclarationNames.getCXXConstructorName( 5883 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5884 5885 DeclContext::lookup_const_iterator Con, ConEnd; 5886 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5887 Con != ConEnd; ++Con) { 5888 // FIXME: In C++0x, a constructor template can be a default constructor. 5889 if (isa<FunctionTemplateDecl>(*Con)) 5890 continue; 5891 5892 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5893 if (Constructor->isDefaultConstructor()) 5894 return Constructor; 5895 } 5896 return 0; 5897} 5898 5899Sema::ImplicitExceptionSpecification 5900Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5901 // C++ [except.spec]p14: 5902 // An implicitly declared special member function (Clause 12) shall have an 5903 // exception-specification. [...] 5904 ImplicitExceptionSpecification ExceptSpec(Context); 5905 5906 // Direct base-class constructors. 5907 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5908 BEnd = ClassDecl->bases_end(); 5909 B != BEnd; ++B) { 5910 if (B->isVirtual()) // Handled below. 5911 continue; 5912 5913 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5914 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5915 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5916 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5917 else if (CXXConstructorDecl *Constructor 5918 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5919 ExceptSpec.CalledDecl(Constructor); 5920 } 5921 } 5922 5923 // Virtual base-class constructors. 5924 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5925 BEnd = ClassDecl->vbases_end(); 5926 B != BEnd; ++B) { 5927 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5928 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5929 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5930 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5931 else if (CXXConstructorDecl *Constructor 5932 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5933 ExceptSpec.CalledDecl(Constructor); 5934 } 5935 } 5936 5937 // Field constructors. 5938 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5939 FEnd = ClassDecl->field_end(); 5940 F != FEnd; ++F) { 5941 if (const RecordType *RecordTy 5942 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5943 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5944 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5945 ExceptSpec.CalledDecl( 5946 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5947 else if (CXXConstructorDecl *Constructor 5948 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5949 ExceptSpec.CalledDecl(Constructor); 5950 } 5951 } 5952 5953 return ExceptSpec; 5954} 5955 5956CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5957 CXXRecordDecl *ClassDecl) { 5958 // C++ [class.ctor]p5: 5959 // A default constructor for a class X is a constructor of class X 5960 // that can be called without an argument. If there is no 5961 // user-declared constructor for class X, a default constructor is 5962 // implicitly declared. An implicitly-declared default constructor 5963 // is an inline public member of its class. 5964 assert(!ClassDecl->hasUserDeclaredConstructor() && 5965 "Should not build implicit default constructor!"); 5966 5967 ImplicitExceptionSpecification Spec = 5968 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5969 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5970 5971 // Create the actual constructor declaration. 5972 CanQualType ClassType 5973 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5974 SourceLocation ClassLoc = ClassDecl->getLocation(); 5975 DeclarationName Name 5976 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5977 DeclarationNameInfo NameInfo(Name, ClassLoc); 5978 CXXConstructorDecl *DefaultCon 5979 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5980 Context.getFunctionType(Context.VoidTy, 5981 0, 0, EPI), 5982 /*TInfo=*/0, 5983 /*isExplicit=*/false, 5984 /*isInline=*/true, 5985 /*isImplicitlyDeclared=*/true); 5986 DefaultCon->setAccess(AS_public); 5987 DefaultCon->setDefaulted(); 5988 DefaultCon->setImplicit(); 5989 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5990 5991 // Note that we have declared this constructor. 5992 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5993 5994 if (Scope *S = getScopeForContext(ClassDecl)) 5995 PushOnScopeChains(DefaultCon, S, false); 5996 ClassDecl->addDecl(DefaultCon); 5997 5998 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5999 DefaultCon->setDeletedAsWritten(); 6000 6001 return DefaultCon; 6002} 6003 6004void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6005 CXXConstructorDecl *Constructor) { 6006 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6007 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 6008 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6009 6010 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6011 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6012 6013 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6014 DiagnosticErrorTrap Trap(Diags); 6015 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6016 Trap.hasErrorOccurred()) { 6017 Diag(CurrentLocation, diag::note_member_synthesized_at) 6018 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6019 Constructor->setInvalidDecl(); 6020 return; 6021 } 6022 6023 SourceLocation Loc = Constructor->getLocation(); 6024 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6025 6026 Constructor->setUsed(); 6027 MarkVTableUsed(CurrentLocation, ClassDecl); 6028 6029 if (ASTMutationListener *L = getASTMutationListener()) { 6030 L->CompletedImplicitDefinition(Constructor); 6031 } 6032} 6033 6034void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6035 // We start with an initial pass over the base classes to collect those that 6036 // inherit constructors from. If there are none, we can forgo all further 6037 // processing. 6038 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6039 BasesVector BasesToInheritFrom; 6040 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6041 BaseE = ClassDecl->bases_end(); 6042 BaseIt != BaseE; ++BaseIt) { 6043 if (BaseIt->getInheritConstructors()) { 6044 QualType Base = BaseIt->getType(); 6045 if (Base->isDependentType()) { 6046 // If we inherit constructors from anything that is dependent, just 6047 // abort processing altogether. We'll get another chance for the 6048 // instantiations. 6049 return; 6050 } 6051 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6052 } 6053 } 6054 if (BasesToInheritFrom.empty()) 6055 return; 6056 6057 // Now collect the constructors that we already have in the current class. 6058 // Those take precedence over inherited constructors. 6059 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6060 // unless there is a user-declared constructor with the same signature in 6061 // the class where the using-declaration appears. 6062 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6063 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6064 CtorE = ClassDecl->ctor_end(); 6065 CtorIt != CtorE; ++CtorIt) { 6066 ExistingConstructors.insert( 6067 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6068 } 6069 6070 Scope *S = getScopeForContext(ClassDecl); 6071 DeclarationName CreatedCtorName = 6072 Context.DeclarationNames.getCXXConstructorName( 6073 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6074 6075 // Now comes the true work. 6076 // First, we keep a map from constructor types to the base that introduced 6077 // them. Needed for finding conflicting constructors. We also keep the 6078 // actually inserted declarations in there, for pretty diagnostics. 6079 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6080 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6081 ConstructorToSourceMap InheritedConstructors; 6082 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6083 BaseE = BasesToInheritFrom.end(); 6084 BaseIt != BaseE; ++BaseIt) { 6085 const RecordType *Base = *BaseIt; 6086 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6087 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6088 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6089 CtorE = BaseDecl->ctor_end(); 6090 CtorIt != CtorE; ++CtorIt) { 6091 // Find the using declaration for inheriting this base's constructors. 6092 DeclarationName Name = 6093 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6094 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6095 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6096 SourceLocation UsingLoc = UD ? UD->getLocation() : 6097 ClassDecl->getLocation(); 6098 6099 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6100 // from the class X named in the using-declaration consists of actual 6101 // constructors and notional constructors that result from the 6102 // transformation of defaulted parameters as follows: 6103 // - all non-template default constructors of X, and 6104 // - for each non-template constructor of X that has at least one 6105 // parameter with a default argument, the set of constructors that 6106 // results from omitting any ellipsis parameter specification and 6107 // successively omitting parameters with a default argument from the 6108 // end of the parameter-type-list. 6109 CXXConstructorDecl *BaseCtor = *CtorIt; 6110 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6111 const FunctionProtoType *BaseCtorType = 6112 BaseCtor->getType()->getAs<FunctionProtoType>(); 6113 6114 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6115 maxParams = BaseCtor->getNumParams(); 6116 params <= maxParams; ++params) { 6117 // Skip default constructors. They're never inherited. 6118 if (params == 0) 6119 continue; 6120 // Skip copy and move constructors for the same reason. 6121 if (CanBeCopyOrMove && params == 1) 6122 continue; 6123 6124 // Build up a function type for this particular constructor. 6125 // FIXME: The working paper does not consider that the exception spec 6126 // for the inheriting constructor might be larger than that of the 6127 // source. This code doesn't yet, either. 6128 const Type *NewCtorType; 6129 if (params == maxParams) 6130 NewCtorType = BaseCtorType; 6131 else { 6132 llvm::SmallVector<QualType, 16> Args; 6133 for (unsigned i = 0; i < params; ++i) { 6134 Args.push_back(BaseCtorType->getArgType(i)); 6135 } 6136 FunctionProtoType::ExtProtoInfo ExtInfo = 6137 BaseCtorType->getExtProtoInfo(); 6138 ExtInfo.Variadic = false; 6139 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6140 Args.data(), params, ExtInfo) 6141 .getTypePtr(); 6142 } 6143 const Type *CanonicalNewCtorType = 6144 Context.getCanonicalType(NewCtorType); 6145 6146 // Now that we have the type, first check if the class already has a 6147 // constructor with this signature. 6148 if (ExistingConstructors.count(CanonicalNewCtorType)) 6149 continue; 6150 6151 // Then we check if we have already declared an inherited constructor 6152 // with this signature. 6153 std::pair<ConstructorToSourceMap::iterator, bool> result = 6154 InheritedConstructors.insert(std::make_pair( 6155 CanonicalNewCtorType, 6156 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6157 if (!result.second) { 6158 // Already in the map. If it came from a different class, that's an 6159 // error. Not if it's from the same. 6160 CanQualType PreviousBase = result.first->second.first; 6161 if (CanonicalBase != PreviousBase) { 6162 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6163 const CXXConstructorDecl *PrevBaseCtor = 6164 PrevCtor->getInheritedConstructor(); 6165 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6166 6167 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6168 Diag(BaseCtor->getLocation(), 6169 diag::note_using_decl_constructor_conflict_current_ctor); 6170 Diag(PrevBaseCtor->getLocation(), 6171 diag::note_using_decl_constructor_conflict_previous_ctor); 6172 Diag(PrevCtor->getLocation(), 6173 diag::note_using_decl_constructor_conflict_previous_using); 6174 } 6175 continue; 6176 } 6177 6178 // OK, we're there, now add the constructor. 6179 // C++0x [class.inhctor]p8: [...] that would be performed by a 6180 // user-writtern inline constructor [...] 6181 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6182 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6183 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6184 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6185 /*ImplicitlyDeclared=*/true); 6186 NewCtor->setAccess(BaseCtor->getAccess()); 6187 6188 // Build up the parameter decls and add them. 6189 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6190 for (unsigned i = 0; i < params; ++i) { 6191 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6192 UsingLoc, UsingLoc, 6193 /*IdentifierInfo=*/0, 6194 BaseCtorType->getArgType(i), 6195 /*TInfo=*/0, SC_None, 6196 SC_None, /*DefaultArg=*/0)); 6197 } 6198 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6199 NewCtor->setInheritedConstructor(BaseCtor); 6200 6201 PushOnScopeChains(NewCtor, S, false); 6202 ClassDecl->addDecl(NewCtor); 6203 result.first->second.second = NewCtor; 6204 } 6205 } 6206 } 6207} 6208 6209Sema::ImplicitExceptionSpecification 6210Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6211 // C++ [except.spec]p14: 6212 // An implicitly declared special member function (Clause 12) shall have 6213 // an exception-specification. 6214 ImplicitExceptionSpecification ExceptSpec(Context); 6215 6216 // Direct base-class destructors. 6217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6218 BEnd = ClassDecl->bases_end(); 6219 B != BEnd; ++B) { 6220 if (B->isVirtual()) // Handled below. 6221 continue; 6222 6223 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6224 ExceptSpec.CalledDecl( 6225 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6226 } 6227 6228 // Virtual base-class destructors. 6229 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6230 BEnd = ClassDecl->vbases_end(); 6231 B != BEnd; ++B) { 6232 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6233 ExceptSpec.CalledDecl( 6234 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6235 } 6236 6237 // Field destructors. 6238 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6239 FEnd = ClassDecl->field_end(); 6240 F != FEnd; ++F) { 6241 if (const RecordType *RecordTy 6242 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6243 ExceptSpec.CalledDecl( 6244 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6245 } 6246 6247 return ExceptSpec; 6248} 6249 6250CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6251 // C++ [class.dtor]p2: 6252 // If a class has no user-declared destructor, a destructor is 6253 // declared implicitly. An implicitly-declared destructor is an 6254 // inline public member of its class. 6255 6256 ImplicitExceptionSpecification Spec = 6257 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6258 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6259 6260 // Create the actual destructor declaration. 6261 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6262 6263 CanQualType ClassType 6264 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6265 SourceLocation ClassLoc = ClassDecl->getLocation(); 6266 DeclarationName Name 6267 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6268 DeclarationNameInfo NameInfo(Name, ClassLoc); 6269 CXXDestructorDecl *Destructor 6270 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6271 /*isInline=*/true, 6272 /*isImplicitlyDeclared=*/true); 6273 Destructor->setAccess(AS_public); 6274 Destructor->setDefaulted(); 6275 Destructor->setImplicit(); 6276 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6277 6278 // Note that we have declared this destructor. 6279 ++ASTContext::NumImplicitDestructorsDeclared; 6280 6281 // Introduce this destructor into its scope. 6282 if (Scope *S = getScopeForContext(ClassDecl)) 6283 PushOnScopeChains(Destructor, S, false); 6284 ClassDecl->addDecl(Destructor); 6285 6286 // This could be uniqued if it ever proves significant. 6287 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6288 6289 if (ShouldDeleteDestructor(Destructor)) 6290 Destructor->setDeletedAsWritten(); 6291 6292 AddOverriddenMethods(ClassDecl, Destructor); 6293 6294 return Destructor; 6295} 6296 6297void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6298 CXXDestructorDecl *Destructor) { 6299 assert((Destructor->isDefaulted() && !Destructor->isUsed(false)) && 6300 "DefineImplicitDestructor - call it for implicit default dtor"); 6301 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6302 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6303 6304 if (Destructor->isInvalidDecl()) 6305 return; 6306 6307 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6308 6309 DiagnosticErrorTrap Trap(Diags); 6310 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6311 Destructor->getParent()); 6312 6313 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6314 Diag(CurrentLocation, diag::note_member_synthesized_at) 6315 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6316 6317 Destructor->setInvalidDecl(); 6318 return; 6319 } 6320 6321 SourceLocation Loc = Destructor->getLocation(); 6322 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6323 6324 Destructor->setUsed(); 6325 MarkVTableUsed(CurrentLocation, ClassDecl); 6326 6327 if (ASTMutationListener *L = getASTMutationListener()) { 6328 L->CompletedImplicitDefinition(Destructor); 6329 } 6330} 6331 6332/// \brief Builds a statement that copies the given entity from \p From to 6333/// \c To. 6334/// 6335/// This routine is used to copy the members of a class with an 6336/// implicitly-declared copy assignment operator. When the entities being 6337/// copied are arrays, this routine builds for loops to copy them. 6338/// 6339/// \param S The Sema object used for type-checking. 6340/// 6341/// \param Loc The location where the implicit copy is being generated. 6342/// 6343/// \param T The type of the expressions being copied. Both expressions must 6344/// have this type. 6345/// 6346/// \param To The expression we are copying to. 6347/// 6348/// \param From The expression we are copying from. 6349/// 6350/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6351/// Otherwise, it's a non-static member subobject. 6352/// 6353/// \param Depth Internal parameter recording the depth of the recursion. 6354/// 6355/// \returns A statement or a loop that copies the expressions. 6356static StmtResult 6357BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6358 Expr *To, Expr *From, 6359 bool CopyingBaseSubobject, unsigned Depth = 0) { 6360 // C++0x [class.copy]p30: 6361 // Each subobject is assigned in the manner appropriate to its type: 6362 // 6363 // - if the subobject is of class type, the copy assignment operator 6364 // for the class is used (as if by explicit qualification; that is, 6365 // ignoring any possible virtual overriding functions in more derived 6366 // classes); 6367 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6368 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6369 6370 // Look for operator=. 6371 DeclarationName Name 6372 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6373 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6374 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6375 6376 // Filter out any result that isn't a copy-assignment operator. 6377 LookupResult::Filter F = OpLookup.makeFilter(); 6378 while (F.hasNext()) { 6379 NamedDecl *D = F.next(); 6380 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6381 if (Method->isCopyAssignmentOperator()) 6382 continue; 6383 6384 F.erase(); 6385 } 6386 F.done(); 6387 6388 // Suppress the protected check (C++ [class.protected]) for each of the 6389 // assignment operators we found. This strange dance is required when 6390 // we're assigning via a base classes's copy-assignment operator. To 6391 // ensure that we're getting the right base class subobject (without 6392 // ambiguities), we need to cast "this" to that subobject type; to 6393 // ensure that we don't go through the virtual call mechanism, we need 6394 // to qualify the operator= name with the base class (see below). However, 6395 // this means that if the base class has a protected copy assignment 6396 // operator, the protected member access check will fail. So, we 6397 // rewrite "protected" access to "public" access in this case, since we 6398 // know by construction that we're calling from a derived class. 6399 if (CopyingBaseSubobject) { 6400 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6401 L != LEnd; ++L) { 6402 if (L.getAccess() == AS_protected) 6403 L.setAccess(AS_public); 6404 } 6405 } 6406 6407 // Create the nested-name-specifier that will be used to qualify the 6408 // reference to operator=; this is required to suppress the virtual 6409 // call mechanism. 6410 CXXScopeSpec SS; 6411 SS.MakeTrivial(S.Context, 6412 NestedNameSpecifier::Create(S.Context, 0, false, 6413 T.getTypePtr()), 6414 Loc); 6415 6416 // Create the reference to operator=. 6417 ExprResult OpEqualRef 6418 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6419 /*FirstQualifierInScope=*/0, OpLookup, 6420 /*TemplateArgs=*/0, 6421 /*SuppressQualifierCheck=*/true); 6422 if (OpEqualRef.isInvalid()) 6423 return StmtError(); 6424 6425 // Build the call to the assignment operator. 6426 6427 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6428 OpEqualRef.takeAs<Expr>(), 6429 Loc, &From, 1, Loc); 6430 if (Call.isInvalid()) 6431 return StmtError(); 6432 6433 return S.Owned(Call.takeAs<Stmt>()); 6434 } 6435 6436 // - if the subobject is of scalar type, the built-in assignment 6437 // operator is used. 6438 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6439 if (!ArrayTy) { 6440 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6441 if (Assignment.isInvalid()) 6442 return StmtError(); 6443 6444 return S.Owned(Assignment.takeAs<Stmt>()); 6445 } 6446 6447 // - if the subobject is an array, each element is assigned, in the 6448 // manner appropriate to the element type; 6449 6450 // Construct a loop over the array bounds, e.g., 6451 // 6452 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6453 // 6454 // that will copy each of the array elements. 6455 QualType SizeType = S.Context.getSizeType(); 6456 6457 // Create the iteration variable. 6458 IdentifierInfo *IterationVarName = 0; 6459 { 6460 llvm::SmallString<8> Str; 6461 llvm::raw_svector_ostream OS(Str); 6462 OS << "__i" << Depth; 6463 IterationVarName = &S.Context.Idents.get(OS.str()); 6464 } 6465 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6466 IterationVarName, SizeType, 6467 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6468 SC_None, SC_None); 6469 6470 // Initialize the iteration variable to zero. 6471 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6472 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6473 6474 // Create a reference to the iteration variable; we'll use this several 6475 // times throughout. 6476 Expr *IterationVarRef 6477 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6478 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6479 6480 // Create the DeclStmt that holds the iteration variable. 6481 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6482 6483 // Create the comparison against the array bound. 6484 llvm::APInt Upper 6485 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6486 Expr *Comparison 6487 = new (S.Context) BinaryOperator(IterationVarRef, 6488 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6489 BO_NE, S.Context.BoolTy, 6490 VK_RValue, OK_Ordinary, Loc); 6491 6492 // Create the pre-increment of the iteration variable. 6493 Expr *Increment 6494 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6495 VK_LValue, OK_Ordinary, Loc); 6496 6497 // Subscript the "from" and "to" expressions with the iteration variable. 6498 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6499 IterationVarRef, Loc)); 6500 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6501 IterationVarRef, Loc)); 6502 6503 // Build the copy for an individual element of the array. 6504 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6505 To, From, CopyingBaseSubobject, 6506 Depth + 1); 6507 if (Copy.isInvalid()) 6508 return StmtError(); 6509 6510 // Construct the loop that copies all elements of this array. 6511 return S.ActOnForStmt(Loc, Loc, InitStmt, 6512 S.MakeFullExpr(Comparison), 6513 0, S.MakeFullExpr(Increment), 6514 Loc, Copy.take()); 6515} 6516 6517/// \brief Determine whether the given class has a copy assignment operator 6518/// that accepts a const-qualified argument. 6519static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6520 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6521 6522 if (!Class->hasDeclaredCopyAssignment()) 6523 S.DeclareImplicitCopyAssignment(Class); 6524 6525 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6526 DeclarationName OpName 6527 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6528 6529 DeclContext::lookup_const_iterator Op, OpEnd; 6530 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6531 // C++ [class.copy]p9: 6532 // A user-declared copy assignment operator is a non-static non-template 6533 // member function of class X with exactly one parameter of type X, X&, 6534 // const X&, volatile X& or const volatile X&. 6535 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6536 if (!Method) 6537 continue; 6538 6539 if (Method->isStatic()) 6540 continue; 6541 if (Method->getPrimaryTemplate()) 6542 continue; 6543 const FunctionProtoType *FnType = 6544 Method->getType()->getAs<FunctionProtoType>(); 6545 assert(FnType && "Overloaded operator has no prototype."); 6546 // Don't assert on this; an invalid decl might have been left in the AST. 6547 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6548 continue; 6549 bool AcceptsConst = true; 6550 QualType ArgType = FnType->getArgType(0); 6551 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6552 ArgType = Ref->getPointeeType(); 6553 // Is it a non-const lvalue reference? 6554 if (!ArgType.isConstQualified()) 6555 AcceptsConst = false; 6556 } 6557 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6558 continue; 6559 6560 // We have a single argument of type cv X or cv X&, i.e. we've found the 6561 // copy assignment operator. Return whether it accepts const arguments. 6562 return AcceptsConst; 6563 } 6564 assert(Class->isInvalidDecl() && 6565 "No copy assignment operator declared in valid code."); 6566 return false; 6567} 6568 6569std::pair<Sema::ImplicitExceptionSpecification, bool> 6570Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6571 CXXRecordDecl *ClassDecl) { 6572 // C++ [class.copy]p10: 6573 // If the class definition does not explicitly declare a copy 6574 // assignment operator, one is declared implicitly. 6575 // The implicitly-defined copy assignment operator for a class X 6576 // will have the form 6577 // 6578 // X& X::operator=(const X&) 6579 // 6580 // if 6581 bool HasConstCopyAssignment = true; 6582 6583 // -- each direct base class B of X has a copy assignment operator 6584 // whose parameter is of type const B&, const volatile B& or B, 6585 // and 6586 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6587 BaseEnd = ClassDecl->bases_end(); 6588 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6589 assert(!Base->getType()->isDependentType() && 6590 "Cannot generate implicit members for class with dependent bases."); 6591 const CXXRecordDecl *BaseClassDecl 6592 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6593 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6594 } 6595 6596 // -- for all the nonstatic data members of X that are of a class 6597 // type M (or array thereof), each such class type has a copy 6598 // assignment operator whose parameter is of type const M&, 6599 // const volatile M& or M. 6600 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6601 FieldEnd = ClassDecl->field_end(); 6602 HasConstCopyAssignment && Field != FieldEnd; 6603 ++Field) { 6604 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6605 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6606 const CXXRecordDecl *FieldClassDecl 6607 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6608 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6609 } 6610 } 6611 6612 // Otherwise, the implicitly declared copy assignment operator will 6613 // have the form 6614 // 6615 // X& X::operator=(X&) 6616 6617 // C++ [except.spec]p14: 6618 // An implicitly declared special member function (Clause 12) shall have an 6619 // exception-specification. [...] 6620 ImplicitExceptionSpecification ExceptSpec(Context); 6621 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6622 BaseEnd = ClassDecl->bases_end(); 6623 Base != BaseEnd; ++Base) { 6624 CXXRecordDecl *BaseClassDecl 6625 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6626 6627 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6628 DeclareImplicitCopyAssignment(BaseClassDecl); 6629 6630 if (CXXMethodDecl *CopyAssign 6631 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6632 ExceptSpec.CalledDecl(CopyAssign); 6633 } 6634 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6635 FieldEnd = ClassDecl->field_end(); 6636 Field != FieldEnd; 6637 ++Field) { 6638 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6639 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6640 CXXRecordDecl *FieldClassDecl 6641 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6642 6643 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6644 DeclareImplicitCopyAssignment(FieldClassDecl); 6645 6646 if (CXXMethodDecl *CopyAssign 6647 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6648 ExceptSpec.CalledDecl(CopyAssign); 6649 } 6650 } 6651 6652 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6653} 6654 6655CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6656 // Note: The following rules are largely analoguous to the copy 6657 // constructor rules. Note that virtual bases are not taken into account 6658 // for determining the argument type of the operator. Note also that 6659 // operators taking an object instead of a reference are allowed. 6660 6661 ImplicitExceptionSpecification Spec(Context); 6662 bool Const; 6663 llvm::tie(Spec, Const) = 6664 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6665 6666 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6667 QualType RetType = Context.getLValueReferenceType(ArgType); 6668 if (Const) 6669 ArgType = ArgType.withConst(); 6670 ArgType = Context.getLValueReferenceType(ArgType); 6671 6672 // An implicitly-declared copy assignment operator is an inline public 6673 // member of its class. 6674 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6675 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6676 SourceLocation ClassLoc = ClassDecl->getLocation(); 6677 DeclarationNameInfo NameInfo(Name, ClassLoc); 6678 CXXMethodDecl *CopyAssignment 6679 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6680 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6681 /*TInfo=*/0, /*isStatic=*/false, 6682 /*StorageClassAsWritten=*/SC_None, 6683 /*isInline=*/true, 6684 SourceLocation()); 6685 CopyAssignment->setAccess(AS_public); 6686 CopyAssignment->setDefaulted(); 6687 CopyAssignment->setImplicit(); 6688 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6689 6690 // Add the parameter to the operator. 6691 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6692 ClassLoc, ClassLoc, /*Id=*/0, 6693 ArgType, /*TInfo=*/0, 6694 SC_None, 6695 SC_None, 0); 6696 CopyAssignment->setParams(&FromParam, 1); 6697 6698 // Note that we have added this copy-assignment operator. 6699 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6700 6701 if (Scope *S = getScopeForContext(ClassDecl)) 6702 PushOnScopeChains(CopyAssignment, S, false); 6703 ClassDecl->addDecl(CopyAssignment); 6704 6705 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6706 CopyAssignment->setDeletedAsWritten(); 6707 6708 AddOverriddenMethods(ClassDecl, CopyAssignment); 6709 return CopyAssignment; 6710} 6711 6712void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6713 CXXMethodDecl *CopyAssignOperator) { 6714 assert((CopyAssignOperator->isDefaulted() && 6715 CopyAssignOperator->isOverloadedOperator() && 6716 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6717 !CopyAssignOperator->isUsed(false)) && 6718 "DefineImplicitCopyAssignment called for wrong function"); 6719 6720 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6721 6722 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6723 CopyAssignOperator->setInvalidDecl(); 6724 return; 6725 } 6726 6727 CopyAssignOperator->setUsed(); 6728 6729 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6730 DiagnosticErrorTrap Trap(Diags); 6731 6732 // C++0x [class.copy]p30: 6733 // The implicitly-defined or explicitly-defaulted copy assignment operator 6734 // for a non-union class X performs memberwise copy assignment of its 6735 // subobjects. The direct base classes of X are assigned first, in the 6736 // order of their declaration in the base-specifier-list, and then the 6737 // immediate non-static data members of X are assigned, in the order in 6738 // which they were declared in the class definition. 6739 6740 // The statements that form the synthesized function body. 6741 ASTOwningVector<Stmt*> Statements(*this); 6742 6743 // The parameter for the "other" object, which we are copying from. 6744 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6745 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6746 QualType OtherRefType = Other->getType(); 6747 if (const LValueReferenceType *OtherRef 6748 = OtherRefType->getAs<LValueReferenceType>()) { 6749 OtherRefType = OtherRef->getPointeeType(); 6750 OtherQuals = OtherRefType.getQualifiers(); 6751 } 6752 6753 // Our location for everything implicitly-generated. 6754 SourceLocation Loc = CopyAssignOperator->getLocation(); 6755 6756 // Construct a reference to the "other" object. We'll be using this 6757 // throughout the generated ASTs. 6758 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6759 assert(OtherRef && "Reference to parameter cannot fail!"); 6760 6761 // Construct the "this" pointer. We'll be using this throughout the generated 6762 // ASTs. 6763 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6764 assert(This && "Reference to this cannot fail!"); 6765 6766 // Assign base classes. 6767 bool Invalid = false; 6768 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6769 E = ClassDecl->bases_end(); Base != E; ++Base) { 6770 // Form the assignment: 6771 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6772 QualType BaseType = Base->getType().getUnqualifiedType(); 6773 if (!BaseType->isRecordType()) { 6774 Invalid = true; 6775 continue; 6776 } 6777 6778 CXXCastPath BasePath; 6779 BasePath.push_back(Base); 6780 6781 // Construct the "from" expression, which is an implicit cast to the 6782 // appropriately-qualified base type. 6783 Expr *From = OtherRef; 6784 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6785 CK_UncheckedDerivedToBase, 6786 VK_LValue, &BasePath).take(); 6787 6788 // Dereference "this". 6789 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6790 6791 // Implicitly cast "this" to the appropriately-qualified base type. 6792 To = ImpCastExprToType(To.take(), 6793 Context.getCVRQualifiedType(BaseType, 6794 CopyAssignOperator->getTypeQualifiers()), 6795 CK_UncheckedDerivedToBase, 6796 VK_LValue, &BasePath); 6797 6798 // Build the copy. 6799 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6800 To.get(), From, 6801 /*CopyingBaseSubobject=*/true); 6802 if (Copy.isInvalid()) { 6803 Diag(CurrentLocation, diag::note_member_synthesized_at) 6804 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6805 CopyAssignOperator->setInvalidDecl(); 6806 return; 6807 } 6808 6809 // Success! Record the copy. 6810 Statements.push_back(Copy.takeAs<Expr>()); 6811 } 6812 6813 // \brief Reference to the __builtin_memcpy function. 6814 Expr *BuiltinMemCpyRef = 0; 6815 // \brief Reference to the __builtin_objc_memmove_collectable function. 6816 Expr *CollectableMemCpyRef = 0; 6817 6818 // Assign non-static members. 6819 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6820 FieldEnd = ClassDecl->field_end(); 6821 Field != FieldEnd; ++Field) { 6822 // Check for members of reference type; we can't copy those. 6823 if (Field->getType()->isReferenceType()) { 6824 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6825 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6826 Diag(Field->getLocation(), diag::note_declared_at); 6827 Diag(CurrentLocation, diag::note_member_synthesized_at) 6828 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6829 Invalid = true; 6830 continue; 6831 } 6832 6833 // Check for members of const-qualified, non-class type. 6834 QualType BaseType = Context.getBaseElementType(Field->getType()); 6835 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6836 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6837 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6838 Diag(Field->getLocation(), diag::note_declared_at); 6839 Diag(CurrentLocation, diag::note_member_synthesized_at) 6840 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6841 Invalid = true; 6842 continue; 6843 } 6844 6845 QualType FieldType = Field->getType().getNonReferenceType(); 6846 if (FieldType->isIncompleteArrayType()) { 6847 assert(ClassDecl->hasFlexibleArrayMember() && 6848 "Incomplete array type is not valid"); 6849 continue; 6850 } 6851 6852 // Build references to the field in the object we're copying from and to. 6853 CXXScopeSpec SS; // Intentionally empty 6854 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6855 LookupMemberName); 6856 MemberLookup.addDecl(*Field); 6857 MemberLookup.resolveKind(); 6858 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6859 Loc, /*IsArrow=*/false, 6860 SS, 0, MemberLookup, 0); 6861 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6862 Loc, /*IsArrow=*/true, 6863 SS, 0, MemberLookup, 0); 6864 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6865 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6866 6867 // If the field should be copied with __builtin_memcpy rather than via 6868 // explicit assignments, do so. This optimization only applies for arrays 6869 // of scalars and arrays of class type with trivial copy-assignment 6870 // operators. 6871 if (FieldType->isArrayType() && 6872 (!BaseType->isRecordType() || 6873 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6874 ->hasTrivialCopyAssignment())) { 6875 // Compute the size of the memory buffer to be copied. 6876 QualType SizeType = Context.getSizeType(); 6877 llvm::APInt Size(Context.getTypeSize(SizeType), 6878 Context.getTypeSizeInChars(BaseType).getQuantity()); 6879 for (const ConstantArrayType *Array 6880 = Context.getAsConstantArrayType(FieldType); 6881 Array; 6882 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6883 llvm::APInt ArraySize 6884 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6885 Size *= ArraySize; 6886 } 6887 6888 // Take the address of the field references for "from" and "to". 6889 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6890 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6891 6892 bool NeedsCollectableMemCpy = 6893 (BaseType->isRecordType() && 6894 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6895 6896 if (NeedsCollectableMemCpy) { 6897 if (!CollectableMemCpyRef) { 6898 // Create a reference to the __builtin_objc_memmove_collectable function. 6899 LookupResult R(*this, 6900 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6901 Loc, LookupOrdinaryName); 6902 LookupName(R, TUScope, true); 6903 6904 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6905 if (!CollectableMemCpy) { 6906 // Something went horribly wrong earlier, and we will have 6907 // complained about it. 6908 Invalid = true; 6909 continue; 6910 } 6911 6912 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6913 CollectableMemCpy->getType(), 6914 VK_LValue, Loc, 0).take(); 6915 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6916 } 6917 } 6918 // Create a reference to the __builtin_memcpy builtin function. 6919 else if (!BuiltinMemCpyRef) { 6920 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6921 LookupOrdinaryName); 6922 LookupName(R, TUScope, true); 6923 6924 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6925 if (!BuiltinMemCpy) { 6926 // Something went horribly wrong earlier, and we will have complained 6927 // about it. 6928 Invalid = true; 6929 continue; 6930 } 6931 6932 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6933 BuiltinMemCpy->getType(), 6934 VK_LValue, Loc, 0).take(); 6935 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6936 } 6937 6938 ASTOwningVector<Expr*> CallArgs(*this); 6939 CallArgs.push_back(To.takeAs<Expr>()); 6940 CallArgs.push_back(From.takeAs<Expr>()); 6941 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6942 ExprResult Call = ExprError(); 6943 if (NeedsCollectableMemCpy) 6944 Call = ActOnCallExpr(/*Scope=*/0, 6945 CollectableMemCpyRef, 6946 Loc, move_arg(CallArgs), 6947 Loc); 6948 else 6949 Call = ActOnCallExpr(/*Scope=*/0, 6950 BuiltinMemCpyRef, 6951 Loc, move_arg(CallArgs), 6952 Loc); 6953 6954 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6955 Statements.push_back(Call.takeAs<Expr>()); 6956 continue; 6957 } 6958 6959 // Build the copy of this field. 6960 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6961 To.get(), From.get(), 6962 /*CopyingBaseSubobject=*/false); 6963 if (Copy.isInvalid()) { 6964 Diag(CurrentLocation, diag::note_member_synthesized_at) 6965 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6966 CopyAssignOperator->setInvalidDecl(); 6967 return; 6968 } 6969 6970 // Success! Record the copy. 6971 Statements.push_back(Copy.takeAs<Stmt>()); 6972 } 6973 6974 if (!Invalid) { 6975 // Add a "return *this;" 6976 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6977 6978 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6979 if (Return.isInvalid()) 6980 Invalid = true; 6981 else { 6982 Statements.push_back(Return.takeAs<Stmt>()); 6983 6984 if (Trap.hasErrorOccurred()) { 6985 Diag(CurrentLocation, diag::note_member_synthesized_at) 6986 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6987 Invalid = true; 6988 } 6989 } 6990 } 6991 6992 if (Invalid) { 6993 CopyAssignOperator->setInvalidDecl(); 6994 return; 6995 } 6996 6997 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6998 /*isStmtExpr=*/false); 6999 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7000 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7001 7002 if (ASTMutationListener *L = getASTMutationListener()) { 7003 L->CompletedImplicitDefinition(CopyAssignOperator); 7004 } 7005} 7006 7007std::pair<Sema::ImplicitExceptionSpecification, bool> 7008Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7009 // C++ [class.copy]p5: 7010 // The implicitly-declared copy constructor for a class X will 7011 // have the form 7012 // 7013 // X::X(const X&) 7014 // 7015 // if 7016 bool HasConstCopyConstructor = true; 7017 7018 // -- each direct or virtual base class B of X has a copy 7019 // constructor whose first parameter is of type const B& or 7020 // const volatile B&, and 7021 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7022 BaseEnd = ClassDecl->bases_end(); 7023 HasConstCopyConstructor && Base != BaseEnd; 7024 ++Base) { 7025 // Virtual bases are handled below. 7026 if (Base->isVirtual()) 7027 continue; 7028 7029 CXXRecordDecl *BaseClassDecl 7030 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7031 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7032 DeclareImplicitCopyConstructor(BaseClassDecl); 7033 7034 HasConstCopyConstructor 7035 = BaseClassDecl->hasConstCopyConstructor(Context); 7036 } 7037 7038 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7039 BaseEnd = ClassDecl->vbases_end(); 7040 HasConstCopyConstructor && Base != BaseEnd; 7041 ++Base) { 7042 CXXRecordDecl *BaseClassDecl 7043 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7044 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7045 DeclareImplicitCopyConstructor(BaseClassDecl); 7046 7047 HasConstCopyConstructor 7048 = BaseClassDecl->hasConstCopyConstructor(Context); 7049 } 7050 7051 // -- for all the nonstatic data members of X that are of a 7052 // class type M (or array thereof), each such class type 7053 // has a copy constructor whose first parameter is of type 7054 // const M& or const volatile M&. 7055 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7056 FieldEnd = ClassDecl->field_end(); 7057 HasConstCopyConstructor && Field != FieldEnd; 7058 ++Field) { 7059 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7060 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7061 CXXRecordDecl *FieldClassDecl 7062 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7063 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7064 DeclareImplicitCopyConstructor(FieldClassDecl); 7065 7066 HasConstCopyConstructor 7067 = FieldClassDecl->hasConstCopyConstructor(Context); 7068 } 7069 } 7070 // Otherwise, the implicitly declared copy constructor will have 7071 // the form 7072 // 7073 // X::X(X&) 7074 7075 // C++ [except.spec]p14: 7076 // An implicitly declared special member function (Clause 12) shall have an 7077 // exception-specification. [...] 7078 ImplicitExceptionSpecification ExceptSpec(Context); 7079 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7081 BaseEnd = ClassDecl->bases_end(); 7082 Base != BaseEnd; 7083 ++Base) { 7084 // Virtual bases are handled below. 7085 if (Base->isVirtual()) 7086 continue; 7087 7088 CXXRecordDecl *BaseClassDecl 7089 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7090 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7091 DeclareImplicitCopyConstructor(BaseClassDecl); 7092 7093 if (CXXConstructorDecl *CopyConstructor 7094 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7095 ExceptSpec.CalledDecl(CopyConstructor); 7096 } 7097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7098 BaseEnd = ClassDecl->vbases_end(); 7099 Base != BaseEnd; 7100 ++Base) { 7101 CXXRecordDecl *BaseClassDecl 7102 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7103 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7104 DeclareImplicitCopyConstructor(BaseClassDecl); 7105 7106 if (CXXConstructorDecl *CopyConstructor 7107 = BaseClassDecl->getCopyConstructor(Context, Quals)) 7108 ExceptSpec.CalledDecl(CopyConstructor); 7109 } 7110 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7111 FieldEnd = ClassDecl->field_end(); 7112 Field != FieldEnd; 7113 ++Field) { 7114 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7115 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7116 CXXRecordDecl *FieldClassDecl 7117 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7118 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7119 DeclareImplicitCopyConstructor(FieldClassDecl); 7120 7121 if (CXXConstructorDecl *CopyConstructor 7122 = FieldClassDecl->getCopyConstructor(Context, Quals)) 7123 ExceptSpec.CalledDecl(CopyConstructor); 7124 } 7125 } 7126 7127 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7128} 7129 7130CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7131 CXXRecordDecl *ClassDecl) { 7132 // C++ [class.copy]p4: 7133 // If the class definition does not explicitly declare a copy 7134 // constructor, one is declared implicitly. 7135 7136 ImplicitExceptionSpecification Spec(Context); 7137 bool Const; 7138 llvm::tie(Spec, Const) = 7139 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7140 7141 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7142 QualType ArgType = ClassType; 7143 if (Const) 7144 ArgType = ArgType.withConst(); 7145 ArgType = Context.getLValueReferenceType(ArgType); 7146 7147 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7148 7149 DeclarationName Name 7150 = Context.DeclarationNames.getCXXConstructorName( 7151 Context.getCanonicalType(ClassType)); 7152 SourceLocation ClassLoc = ClassDecl->getLocation(); 7153 DeclarationNameInfo NameInfo(Name, ClassLoc); 7154 7155 // An implicitly-declared copy constructor is an inline public 7156 // member of its class. 7157 CXXConstructorDecl *CopyConstructor 7158 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7159 Context.getFunctionType(Context.VoidTy, 7160 &ArgType, 1, EPI), 7161 /*TInfo=*/0, 7162 /*isExplicit=*/false, 7163 /*isInline=*/true, 7164 /*isImplicitlyDeclared=*/true); 7165 CopyConstructor->setAccess(AS_public); 7166 CopyConstructor->setDefaulted(); 7167 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7168 7169 // Note that we have declared this constructor. 7170 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7171 7172 // Add the parameter to the constructor. 7173 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7174 ClassLoc, ClassLoc, 7175 /*IdentifierInfo=*/0, 7176 ArgType, /*TInfo=*/0, 7177 SC_None, 7178 SC_None, 0); 7179 CopyConstructor->setParams(&FromParam, 1); 7180 7181 if (Scope *S = getScopeForContext(ClassDecl)) 7182 PushOnScopeChains(CopyConstructor, S, false); 7183 ClassDecl->addDecl(CopyConstructor); 7184 7185 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7186 CopyConstructor->setDeletedAsWritten(); 7187 7188 return CopyConstructor; 7189} 7190 7191void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7192 CXXConstructorDecl *CopyConstructor) { 7193 assert((CopyConstructor->isDefaulted() && 7194 CopyConstructor->isCopyConstructor() && 7195 !CopyConstructor->isUsed(false)) && 7196 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7197 7198 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7199 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7200 7201 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7202 DiagnosticErrorTrap Trap(Diags); 7203 7204 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7205 Trap.hasErrorOccurred()) { 7206 Diag(CurrentLocation, diag::note_member_synthesized_at) 7207 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7208 CopyConstructor->setInvalidDecl(); 7209 } else { 7210 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7211 CopyConstructor->getLocation(), 7212 MultiStmtArg(*this, 0, 0), 7213 /*isStmtExpr=*/false) 7214 .takeAs<Stmt>()); 7215 } 7216 7217 CopyConstructor->setUsed(); 7218 7219 if (ASTMutationListener *L = getASTMutationListener()) { 7220 L->CompletedImplicitDefinition(CopyConstructor); 7221 } 7222} 7223 7224ExprResult 7225Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7226 CXXConstructorDecl *Constructor, 7227 MultiExprArg ExprArgs, 7228 bool RequiresZeroInit, 7229 unsigned ConstructKind, 7230 SourceRange ParenRange) { 7231 bool Elidable = false; 7232 7233 // C++0x [class.copy]p34: 7234 // When certain criteria are met, an implementation is allowed to 7235 // omit the copy/move construction of a class object, even if the 7236 // copy/move constructor and/or destructor for the object have 7237 // side effects. [...] 7238 // - when a temporary class object that has not been bound to a 7239 // reference (12.2) would be copied/moved to a class object 7240 // with the same cv-unqualified type, the copy/move operation 7241 // can be omitted by constructing the temporary object 7242 // directly into the target of the omitted copy/move 7243 if (ConstructKind == CXXConstructExpr::CK_Complete && 7244 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7245 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7246 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7247 } 7248 7249 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7250 Elidable, move(ExprArgs), RequiresZeroInit, 7251 ConstructKind, ParenRange); 7252} 7253 7254/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7255/// including handling of its default argument expressions. 7256ExprResult 7257Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7258 CXXConstructorDecl *Constructor, bool Elidable, 7259 MultiExprArg ExprArgs, 7260 bool RequiresZeroInit, 7261 unsigned ConstructKind, 7262 SourceRange ParenRange) { 7263 unsigned NumExprs = ExprArgs.size(); 7264 Expr **Exprs = (Expr **)ExprArgs.release(); 7265 7266 for (specific_attr_iterator<NonNullAttr> 7267 i = Constructor->specific_attr_begin<NonNullAttr>(), 7268 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7269 const NonNullAttr *NonNull = *i; 7270 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7271 } 7272 7273 MarkDeclarationReferenced(ConstructLoc, Constructor); 7274 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7275 Constructor, Elidable, Exprs, NumExprs, 7276 RequiresZeroInit, 7277 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7278 ParenRange)); 7279} 7280 7281bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7282 CXXConstructorDecl *Constructor, 7283 MultiExprArg Exprs) { 7284 // FIXME: Provide the correct paren SourceRange when available. 7285 ExprResult TempResult = 7286 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7287 move(Exprs), false, CXXConstructExpr::CK_Complete, 7288 SourceRange()); 7289 if (TempResult.isInvalid()) 7290 return true; 7291 7292 Expr *Temp = TempResult.takeAs<Expr>(); 7293 CheckImplicitConversions(Temp, VD->getLocation()); 7294 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7295 Temp = MaybeCreateExprWithCleanups(Temp); 7296 VD->setInit(Temp); 7297 7298 return false; 7299} 7300 7301void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7302 if (VD->isInvalidDecl()) return; 7303 7304 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7305 if (ClassDecl->isInvalidDecl()) return; 7306 if (ClassDecl->hasTrivialDestructor()) return; 7307 if (ClassDecl->isDependentContext()) return; 7308 7309 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7310 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7311 CheckDestructorAccess(VD->getLocation(), Destructor, 7312 PDiag(diag::err_access_dtor_var) 7313 << VD->getDeclName() 7314 << VD->getType()); 7315 7316 if (!VD->hasGlobalStorage()) return; 7317 7318 // Emit warning for non-trivial dtor in global scope (a real global, 7319 // class-static, function-static). 7320 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7321 7322 // TODO: this should be re-enabled for static locals by !CXAAtExit 7323 if (!VD->isStaticLocal()) 7324 Diag(VD->getLocation(), diag::warn_global_destructor); 7325} 7326 7327/// AddCXXDirectInitializerToDecl - This action is called immediately after 7328/// ActOnDeclarator, when a C++ direct initializer is present. 7329/// e.g: "int x(1);" 7330void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7331 SourceLocation LParenLoc, 7332 MultiExprArg Exprs, 7333 SourceLocation RParenLoc, 7334 bool TypeMayContainAuto) { 7335 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7336 7337 // If there is no declaration, there was an error parsing it. Just ignore 7338 // the initializer. 7339 if (RealDecl == 0) 7340 return; 7341 7342 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7343 if (!VDecl) { 7344 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7345 RealDecl->setInvalidDecl(); 7346 return; 7347 } 7348 7349 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7350 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7351 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7352 if (Exprs.size() > 1) { 7353 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7354 diag::err_auto_var_init_multiple_expressions) 7355 << VDecl->getDeclName() << VDecl->getType() 7356 << VDecl->getSourceRange(); 7357 RealDecl->setInvalidDecl(); 7358 return; 7359 } 7360 7361 Expr *Init = Exprs.get()[0]; 7362 TypeSourceInfo *DeducedType = 0; 7363 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7364 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7365 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7366 << Init->getSourceRange(); 7367 if (!DeducedType) { 7368 RealDecl->setInvalidDecl(); 7369 return; 7370 } 7371 VDecl->setTypeSourceInfo(DeducedType); 7372 VDecl->setType(DeducedType->getType()); 7373 7374 // If this is a redeclaration, check that the type we just deduced matches 7375 // the previously declared type. 7376 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7377 MergeVarDeclTypes(VDecl, Old); 7378 } 7379 7380 // We will represent direct-initialization similarly to copy-initialization: 7381 // int x(1); -as-> int x = 1; 7382 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7383 // 7384 // Clients that want to distinguish between the two forms, can check for 7385 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7386 // A major benefit is that clients that don't particularly care about which 7387 // exactly form was it (like the CodeGen) can handle both cases without 7388 // special case code. 7389 7390 // C++ 8.5p11: 7391 // The form of initialization (using parentheses or '=') is generally 7392 // insignificant, but does matter when the entity being initialized has a 7393 // class type. 7394 7395 if (!VDecl->getType()->isDependentType() && 7396 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7397 diag::err_typecheck_decl_incomplete_type)) { 7398 VDecl->setInvalidDecl(); 7399 return; 7400 } 7401 7402 // The variable can not have an abstract class type. 7403 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7404 diag::err_abstract_type_in_decl, 7405 AbstractVariableType)) 7406 VDecl->setInvalidDecl(); 7407 7408 const VarDecl *Def; 7409 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7410 Diag(VDecl->getLocation(), diag::err_redefinition) 7411 << VDecl->getDeclName(); 7412 Diag(Def->getLocation(), diag::note_previous_definition); 7413 VDecl->setInvalidDecl(); 7414 return; 7415 } 7416 7417 // C++ [class.static.data]p4 7418 // If a static data member is of const integral or const 7419 // enumeration type, its declaration in the class definition can 7420 // specify a constant-initializer which shall be an integral 7421 // constant expression (5.19). In that case, the member can appear 7422 // in integral constant expressions. The member shall still be 7423 // defined in a namespace scope if it is used in the program and the 7424 // namespace scope definition shall not contain an initializer. 7425 // 7426 // We already performed a redefinition check above, but for static 7427 // data members we also need to check whether there was an in-class 7428 // declaration with an initializer. 7429 const VarDecl* PrevInit = 0; 7430 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7431 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7432 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7433 return; 7434 } 7435 7436 bool IsDependent = false; 7437 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7438 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7439 VDecl->setInvalidDecl(); 7440 return; 7441 } 7442 7443 if (Exprs.get()[I]->isTypeDependent()) 7444 IsDependent = true; 7445 } 7446 7447 // If either the declaration has a dependent type or if any of the 7448 // expressions is type-dependent, we represent the initialization 7449 // via a ParenListExpr for later use during template instantiation. 7450 if (VDecl->getType()->isDependentType() || IsDependent) { 7451 // Let clients know that initialization was done with a direct initializer. 7452 VDecl->setCXXDirectInitializer(true); 7453 7454 // Store the initialization expressions as a ParenListExpr. 7455 unsigned NumExprs = Exprs.size(); 7456 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7457 (Expr **)Exprs.release(), 7458 NumExprs, RParenLoc)); 7459 return; 7460 } 7461 7462 // Capture the variable that is being initialized and the style of 7463 // initialization. 7464 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7465 7466 // FIXME: Poor source location information. 7467 InitializationKind Kind 7468 = InitializationKind::CreateDirect(VDecl->getLocation(), 7469 LParenLoc, RParenLoc); 7470 7471 InitializationSequence InitSeq(*this, Entity, Kind, 7472 Exprs.get(), Exprs.size()); 7473 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7474 if (Result.isInvalid()) { 7475 VDecl->setInvalidDecl(); 7476 return; 7477 } 7478 7479 CheckImplicitConversions(Result.get(), LParenLoc); 7480 7481 Result = MaybeCreateExprWithCleanups(Result); 7482 VDecl->setInit(Result.takeAs<Expr>()); 7483 VDecl->setCXXDirectInitializer(true); 7484 7485 CheckCompleteVariableDeclaration(VDecl); 7486} 7487 7488/// \brief Given a constructor and the set of arguments provided for the 7489/// constructor, convert the arguments and add any required default arguments 7490/// to form a proper call to this constructor. 7491/// 7492/// \returns true if an error occurred, false otherwise. 7493bool 7494Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7495 MultiExprArg ArgsPtr, 7496 SourceLocation Loc, 7497 ASTOwningVector<Expr*> &ConvertedArgs) { 7498 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7499 unsigned NumArgs = ArgsPtr.size(); 7500 Expr **Args = (Expr **)ArgsPtr.get(); 7501 7502 const FunctionProtoType *Proto 7503 = Constructor->getType()->getAs<FunctionProtoType>(); 7504 assert(Proto && "Constructor without a prototype?"); 7505 unsigned NumArgsInProto = Proto->getNumArgs(); 7506 7507 // If too few arguments are available, we'll fill in the rest with defaults. 7508 if (NumArgs < NumArgsInProto) 7509 ConvertedArgs.reserve(NumArgsInProto); 7510 else 7511 ConvertedArgs.reserve(NumArgs); 7512 7513 VariadicCallType CallType = 7514 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7515 llvm::SmallVector<Expr *, 8> AllArgs; 7516 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7517 Proto, 0, Args, NumArgs, AllArgs, 7518 CallType); 7519 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7520 ConvertedArgs.push_back(AllArgs[i]); 7521 return Invalid; 7522} 7523 7524static inline bool 7525CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7526 const FunctionDecl *FnDecl) { 7527 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7528 if (isa<NamespaceDecl>(DC)) { 7529 return SemaRef.Diag(FnDecl->getLocation(), 7530 diag::err_operator_new_delete_declared_in_namespace) 7531 << FnDecl->getDeclName(); 7532 } 7533 7534 if (isa<TranslationUnitDecl>(DC) && 7535 FnDecl->getStorageClass() == SC_Static) { 7536 return SemaRef.Diag(FnDecl->getLocation(), 7537 diag::err_operator_new_delete_declared_static) 7538 << FnDecl->getDeclName(); 7539 } 7540 7541 return false; 7542} 7543 7544static inline bool 7545CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7546 CanQualType ExpectedResultType, 7547 CanQualType ExpectedFirstParamType, 7548 unsigned DependentParamTypeDiag, 7549 unsigned InvalidParamTypeDiag) { 7550 QualType ResultType = 7551 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7552 7553 // Check that the result type is not dependent. 7554 if (ResultType->isDependentType()) 7555 return SemaRef.Diag(FnDecl->getLocation(), 7556 diag::err_operator_new_delete_dependent_result_type) 7557 << FnDecl->getDeclName() << ExpectedResultType; 7558 7559 // Check that the result type is what we expect. 7560 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7561 return SemaRef.Diag(FnDecl->getLocation(), 7562 diag::err_operator_new_delete_invalid_result_type) 7563 << FnDecl->getDeclName() << ExpectedResultType; 7564 7565 // A function template must have at least 2 parameters. 7566 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7567 return SemaRef.Diag(FnDecl->getLocation(), 7568 diag::err_operator_new_delete_template_too_few_parameters) 7569 << FnDecl->getDeclName(); 7570 7571 // The function decl must have at least 1 parameter. 7572 if (FnDecl->getNumParams() == 0) 7573 return SemaRef.Diag(FnDecl->getLocation(), 7574 diag::err_operator_new_delete_too_few_parameters) 7575 << FnDecl->getDeclName(); 7576 7577 // Check the the first parameter type is not dependent. 7578 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7579 if (FirstParamType->isDependentType()) 7580 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7581 << FnDecl->getDeclName() << ExpectedFirstParamType; 7582 7583 // Check that the first parameter type is what we expect. 7584 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7585 ExpectedFirstParamType) 7586 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7587 << FnDecl->getDeclName() << ExpectedFirstParamType; 7588 7589 return false; 7590} 7591 7592static bool 7593CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7594 // C++ [basic.stc.dynamic.allocation]p1: 7595 // A program is ill-formed if an allocation function is declared in a 7596 // namespace scope other than global scope or declared static in global 7597 // scope. 7598 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7599 return true; 7600 7601 CanQualType SizeTy = 7602 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7603 7604 // C++ [basic.stc.dynamic.allocation]p1: 7605 // The return type shall be void*. The first parameter shall have type 7606 // std::size_t. 7607 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7608 SizeTy, 7609 diag::err_operator_new_dependent_param_type, 7610 diag::err_operator_new_param_type)) 7611 return true; 7612 7613 // C++ [basic.stc.dynamic.allocation]p1: 7614 // The first parameter shall not have an associated default argument. 7615 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7616 return SemaRef.Diag(FnDecl->getLocation(), 7617 diag::err_operator_new_default_arg) 7618 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7619 7620 return false; 7621} 7622 7623static bool 7624CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7625 // C++ [basic.stc.dynamic.deallocation]p1: 7626 // A program is ill-formed if deallocation functions are declared in a 7627 // namespace scope other than global scope or declared static in global 7628 // scope. 7629 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7630 return true; 7631 7632 // C++ [basic.stc.dynamic.deallocation]p2: 7633 // Each deallocation function shall return void and its first parameter 7634 // shall be void*. 7635 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7636 SemaRef.Context.VoidPtrTy, 7637 diag::err_operator_delete_dependent_param_type, 7638 diag::err_operator_delete_param_type)) 7639 return true; 7640 7641 return false; 7642} 7643 7644/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7645/// of this overloaded operator is well-formed. If so, returns false; 7646/// otherwise, emits appropriate diagnostics and returns true. 7647bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7648 assert(FnDecl && FnDecl->isOverloadedOperator() && 7649 "Expected an overloaded operator declaration"); 7650 7651 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7652 7653 // C++ [over.oper]p5: 7654 // The allocation and deallocation functions, operator new, 7655 // operator new[], operator delete and operator delete[], are 7656 // described completely in 3.7.3. The attributes and restrictions 7657 // found in the rest of this subclause do not apply to them unless 7658 // explicitly stated in 3.7.3. 7659 if (Op == OO_Delete || Op == OO_Array_Delete) 7660 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7661 7662 if (Op == OO_New || Op == OO_Array_New) 7663 return CheckOperatorNewDeclaration(*this, FnDecl); 7664 7665 // C++ [over.oper]p6: 7666 // An operator function shall either be a non-static member 7667 // function or be a non-member function and have at least one 7668 // parameter whose type is a class, a reference to a class, an 7669 // enumeration, or a reference to an enumeration. 7670 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7671 if (MethodDecl->isStatic()) 7672 return Diag(FnDecl->getLocation(), 7673 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7674 } else { 7675 bool ClassOrEnumParam = false; 7676 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7677 ParamEnd = FnDecl->param_end(); 7678 Param != ParamEnd; ++Param) { 7679 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7680 if (ParamType->isDependentType() || ParamType->isRecordType() || 7681 ParamType->isEnumeralType()) { 7682 ClassOrEnumParam = true; 7683 break; 7684 } 7685 } 7686 7687 if (!ClassOrEnumParam) 7688 return Diag(FnDecl->getLocation(), 7689 diag::err_operator_overload_needs_class_or_enum) 7690 << FnDecl->getDeclName(); 7691 } 7692 7693 // C++ [over.oper]p8: 7694 // An operator function cannot have default arguments (8.3.6), 7695 // except where explicitly stated below. 7696 // 7697 // Only the function-call operator allows default arguments 7698 // (C++ [over.call]p1). 7699 if (Op != OO_Call) { 7700 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7701 Param != FnDecl->param_end(); ++Param) { 7702 if ((*Param)->hasDefaultArg()) 7703 return Diag((*Param)->getLocation(), 7704 diag::err_operator_overload_default_arg) 7705 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7706 } 7707 } 7708 7709 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7710 { false, false, false } 7711#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7712 , { Unary, Binary, MemberOnly } 7713#include "clang/Basic/OperatorKinds.def" 7714 }; 7715 7716 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7717 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7718 bool MustBeMemberOperator = OperatorUses[Op][2]; 7719 7720 // C++ [over.oper]p8: 7721 // [...] Operator functions cannot have more or fewer parameters 7722 // than the number required for the corresponding operator, as 7723 // described in the rest of this subclause. 7724 unsigned NumParams = FnDecl->getNumParams() 7725 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7726 if (Op != OO_Call && 7727 ((NumParams == 1 && !CanBeUnaryOperator) || 7728 (NumParams == 2 && !CanBeBinaryOperator) || 7729 (NumParams < 1) || (NumParams > 2))) { 7730 // We have the wrong number of parameters. 7731 unsigned ErrorKind; 7732 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7733 ErrorKind = 2; // 2 -> unary or binary. 7734 } else if (CanBeUnaryOperator) { 7735 ErrorKind = 0; // 0 -> unary 7736 } else { 7737 assert(CanBeBinaryOperator && 7738 "All non-call overloaded operators are unary or binary!"); 7739 ErrorKind = 1; // 1 -> binary 7740 } 7741 7742 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7743 << FnDecl->getDeclName() << NumParams << ErrorKind; 7744 } 7745 7746 // Overloaded operators other than operator() cannot be variadic. 7747 if (Op != OO_Call && 7748 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7749 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7750 << FnDecl->getDeclName(); 7751 } 7752 7753 // Some operators must be non-static member functions. 7754 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7755 return Diag(FnDecl->getLocation(), 7756 diag::err_operator_overload_must_be_member) 7757 << FnDecl->getDeclName(); 7758 } 7759 7760 // C++ [over.inc]p1: 7761 // The user-defined function called operator++ implements the 7762 // prefix and postfix ++ operator. If this function is a member 7763 // function with no parameters, or a non-member function with one 7764 // parameter of class or enumeration type, it defines the prefix 7765 // increment operator ++ for objects of that type. If the function 7766 // is a member function with one parameter (which shall be of type 7767 // int) or a non-member function with two parameters (the second 7768 // of which shall be of type int), it defines the postfix 7769 // increment operator ++ for objects of that type. 7770 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7771 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7772 bool ParamIsInt = false; 7773 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7774 ParamIsInt = BT->getKind() == BuiltinType::Int; 7775 7776 if (!ParamIsInt) 7777 return Diag(LastParam->getLocation(), 7778 diag::err_operator_overload_post_incdec_must_be_int) 7779 << LastParam->getType() << (Op == OO_MinusMinus); 7780 } 7781 7782 return false; 7783} 7784 7785/// CheckLiteralOperatorDeclaration - Check whether the declaration 7786/// of this literal operator function is well-formed. If so, returns 7787/// false; otherwise, emits appropriate diagnostics and returns true. 7788bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7789 DeclContext *DC = FnDecl->getDeclContext(); 7790 Decl::Kind Kind = DC->getDeclKind(); 7791 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7792 Kind != Decl::LinkageSpec) { 7793 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7794 << FnDecl->getDeclName(); 7795 return true; 7796 } 7797 7798 bool Valid = false; 7799 7800 // template <char...> type operator "" name() is the only valid template 7801 // signature, and the only valid signature with no parameters. 7802 if (FnDecl->param_size() == 0) { 7803 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7804 // Must have only one template parameter 7805 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7806 if (Params->size() == 1) { 7807 NonTypeTemplateParmDecl *PmDecl = 7808 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7809 7810 // The template parameter must be a char parameter pack. 7811 if (PmDecl && PmDecl->isTemplateParameterPack() && 7812 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7813 Valid = true; 7814 } 7815 } 7816 } else { 7817 // Check the first parameter 7818 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7819 7820 QualType T = (*Param)->getType(); 7821 7822 // unsigned long long int, long double, and any character type are allowed 7823 // as the only parameters. 7824 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7825 Context.hasSameType(T, Context.LongDoubleTy) || 7826 Context.hasSameType(T, Context.CharTy) || 7827 Context.hasSameType(T, Context.WCharTy) || 7828 Context.hasSameType(T, Context.Char16Ty) || 7829 Context.hasSameType(T, Context.Char32Ty)) { 7830 if (++Param == FnDecl->param_end()) 7831 Valid = true; 7832 goto FinishedParams; 7833 } 7834 7835 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7836 const PointerType *PT = T->getAs<PointerType>(); 7837 if (!PT) 7838 goto FinishedParams; 7839 T = PT->getPointeeType(); 7840 if (!T.isConstQualified()) 7841 goto FinishedParams; 7842 T = T.getUnqualifiedType(); 7843 7844 // Move on to the second parameter; 7845 ++Param; 7846 7847 // If there is no second parameter, the first must be a const char * 7848 if (Param == FnDecl->param_end()) { 7849 if (Context.hasSameType(T, Context.CharTy)) 7850 Valid = true; 7851 goto FinishedParams; 7852 } 7853 7854 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7855 // are allowed as the first parameter to a two-parameter function 7856 if (!(Context.hasSameType(T, Context.CharTy) || 7857 Context.hasSameType(T, Context.WCharTy) || 7858 Context.hasSameType(T, Context.Char16Ty) || 7859 Context.hasSameType(T, Context.Char32Ty))) 7860 goto FinishedParams; 7861 7862 // The second and final parameter must be an std::size_t 7863 T = (*Param)->getType().getUnqualifiedType(); 7864 if (Context.hasSameType(T, Context.getSizeType()) && 7865 ++Param == FnDecl->param_end()) 7866 Valid = true; 7867 } 7868 7869 // FIXME: This diagnostic is absolutely terrible. 7870FinishedParams: 7871 if (!Valid) { 7872 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7873 << FnDecl->getDeclName(); 7874 return true; 7875 } 7876 7877 return false; 7878} 7879 7880/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7881/// linkage specification, including the language and (if present) 7882/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7883/// the location of the language string literal, which is provided 7884/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7885/// the '{' brace. Otherwise, this linkage specification does not 7886/// have any braces. 7887Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7888 SourceLocation LangLoc, 7889 llvm::StringRef Lang, 7890 SourceLocation LBraceLoc) { 7891 LinkageSpecDecl::LanguageIDs Language; 7892 if (Lang == "\"C\"") 7893 Language = LinkageSpecDecl::lang_c; 7894 else if (Lang == "\"C++\"") 7895 Language = LinkageSpecDecl::lang_cxx; 7896 else { 7897 Diag(LangLoc, diag::err_bad_language); 7898 return 0; 7899 } 7900 7901 // FIXME: Add all the various semantics of linkage specifications 7902 7903 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7904 ExternLoc, LangLoc, Language); 7905 CurContext->addDecl(D); 7906 PushDeclContext(S, D); 7907 return D; 7908} 7909 7910/// ActOnFinishLinkageSpecification - Complete the definition of 7911/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7912/// valid, it's the position of the closing '}' brace in a linkage 7913/// specification that uses braces. 7914Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7915 Decl *LinkageSpec, 7916 SourceLocation RBraceLoc) { 7917 if (LinkageSpec) { 7918 if (RBraceLoc.isValid()) { 7919 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7920 LSDecl->setRBraceLoc(RBraceLoc); 7921 } 7922 PopDeclContext(); 7923 } 7924 return LinkageSpec; 7925} 7926 7927/// \brief Perform semantic analysis for the variable declaration that 7928/// occurs within a C++ catch clause, returning the newly-created 7929/// variable. 7930VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7931 TypeSourceInfo *TInfo, 7932 SourceLocation StartLoc, 7933 SourceLocation Loc, 7934 IdentifierInfo *Name) { 7935 bool Invalid = false; 7936 QualType ExDeclType = TInfo->getType(); 7937 7938 // Arrays and functions decay. 7939 if (ExDeclType->isArrayType()) 7940 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7941 else if (ExDeclType->isFunctionType()) 7942 ExDeclType = Context.getPointerType(ExDeclType); 7943 7944 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7945 // The exception-declaration shall not denote a pointer or reference to an 7946 // incomplete type, other than [cv] void*. 7947 // N2844 forbids rvalue references. 7948 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7949 Diag(Loc, diag::err_catch_rvalue_ref); 7950 Invalid = true; 7951 } 7952 7953 // GCC allows catching pointers and references to incomplete types 7954 // as an extension; so do we, but we warn by default. 7955 7956 QualType BaseType = ExDeclType; 7957 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7958 unsigned DK = diag::err_catch_incomplete; 7959 bool IncompleteCatchIsInvalid = true; 7960 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7961 BaseType = Ptr->getPointeeType(); 7962 Mode = 1; 7963 DK = diag::ext_catch_incomplete_ptr; 7964 IncompleteCatchIsInvalid = false; 7965 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7966 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7967 BaseType = Ref->getPointeeType(); 7968 Mode = 2; 7969 DK = diag::ext_catch_incomplete_ref; 7970 IncompleteCatchIsInvalid = false; 7971 } 7972 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7973 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7974 IncompleteCatchIsInvalid) 7975 Invalid = true; 7976 7977 if (!Invalid && !ExDeclType->isDependentType() && 7978 RequireNonAbstractType(Loc, ExDeclType, 7979 diag::err_abstract_type_in_decl, 7980 AbstractVariableType)) 7981 Invalid = true; 7982 7983 // Only the non-fragile NeXT runtime currently supports C++ catches 7984 // of ObjC types, and no runtime supports catching ObjC types by value. 7985 if (!Invalid && getLangOptions().ObjC1) { 7986 QualType T = ExDeclType; 7987 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7988 T = RT->getPointeeType(); 7989 7990 if (T->isObjCObjectType()) { 7991 Diag(Loc, diag::err_objc_object_catch); 7992 Invalid = true; 7993 } else if (T->isObjCObjectPointerType()) { 7994 if (!getLangOptions().ObjCNonFragileABI) { 7995 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7996 Invalid = true; 7997 } 7998 } 7999 } 8000 8001 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8002 ExDeclType, TInfo, SC_None, SC_None); 8003 ExDecl->setExceptionVariable(true); 8004 8005 if (!Invalid) { 8006 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8007 // C++ [except.handle]p16: 8008 // The object declared in an exception-declaration or, if the 8009 // exception-declaration does not specify a name, a temporary (12.2) is 8010 // copy-initialized (8.5) from the exception object. [...] 8011 // The object is destroyed when the handler exits, after the destruction 8012 // of any automatic objects initialized within the handler. 8013 // 8014 // We just pretend to initialize the object with itself, then make sure 8015 // it can be destroyed later. 8016 QualType initType = ExDeclType; 8017 8018 InitializedEntity entity = 8019 InitializedEntity::InitializeVariable(ExDecl); 8020 InitializationKind initKind = 8021 InitializationKind::CreateCopy(Loc, SourceLocation()); 8022 8023 Expr *opaqueValue = 8024 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8025 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8026 ExprResult result = sequence.Perform(*this, entity, initKind, 8027 MultiExprArg(&opaqueValue, 1)); 8028 if (result.isInvalid()) 8029 Invalid = true; 8030 else { 8031 // If the constructor used was non-trivial, set this as the 8032 // "initializer". 8033 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8034 if (!construct->getConstructor()->isTrivial()) { 8035 Expr *init = MaybeCreateExprWithCleanups(construct); 8036 ExDecl->setInit(init); 8037 } 8038 8039 // And make sure it's destructable. 8040 FinalizeVarWithDestructor(ExDecl, recordType); 8041 } 8042 } 8043 } 8044 8045 if (Invalid) 8046 ExDecl->setInvalidDecl(); 8047 8048 return ExDecl; 8049} 8050 8051/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8052/// handler. 8053Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8054 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8055 bool Invalid = D.isInvalidType(); 8056 8057 // Check for unexpanded parameter packs. 8058 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8059 UPPC_ExceptionType)) { 8060 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8061 D.getIdentifierLoc()); 8062 Invalid = true; 8063 } 8064 8065 IdentifierInfo *II = D.getIdentifier(); 8066 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8067 LookupOrdinaryName, 8068 ForRedeclaration)) { 8069 // The scope should be freshly made just for us. There is just no way 8070 // it contains any previous declaration. 8071 assert(!S->isDeclScope(PrevDecl)); 8072 if (PrevDecl->isTemplateParameter()) { 8073 // Maybe we will complain about the shadowed template parameter. 8074 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8075 } 8076 } 8077 8078 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8079 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8080 << D.getCXXScopeSpec().getRange(); 8081 Invalid = true; 8082 } 8083 8084 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8085 D.getSourceRange().getBegin(), 8086 D.getIdentifierLoc(), 8087 D.getIdentifier()); 8088 if (Invalid) 8089 ExDecl->setInvalidDecl(); 8090 8091 // Add the exception declaration into this scope. 8092 if (II) 8093 PushOnScopeChains(ExDecl, S); 8094 else 8095 CurContext->addDecl(ExDecl); 8096 8097 ProcessDeclAttributes(S, ExDecl, D); 8098 return ExDecl; 8099} 8100 8101Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8102 Expr *AssertExpr, 8103 Expr *AssertMessageExpr_, 8104 SourceLocation RParenLoc) { 8105 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8106 8107 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8108 llvm::APSInt Value(32); 8109 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8110 Diag(StaticAssertLoc, 8111 diag::err_static_assert_expression_is_not_constant) << 8112 AssertExpr->getSourceRange(); 8113 return 0; 8114 } 8115 8116 if (Value == 0) { 8117 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8118 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8119 } 8120 } 8121 8122 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8123 return 0; 8124 8125 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8126 AssertExpr, AssertMessage, RParenLoc); 8127 8128 CurContext->addDecl(Decl); 8129 return Decl; 8130} 8131 8132/// \brief Perform semantic analysis of the given friend type declaration. 8133/// 8134/// \returns A friend declaration that. 8135FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8136 TypeSourceInfo *TSInfo) { 8137 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8138 8139 QualType T = TSInfo->getType(); 8140 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8141 8142 if (!getLangOptions().CPlusPlus0x) { 8143 // C++03 [class.friend]p2: 8144 // An elaborated-type-specifier shall be used in a friend declaration 8145 // for a class.* 8146 // 8147 // * The class-key of the elaborated-type-specifier is required. 8148 if (!ActiveTemplateInstantiations.empty()) { 8149 // Do not complain about the form of friend template types during 8150 // template instantiation; we will already have complained when the 8151 // template was declared. 8152 } else if (!T->isElaboratedTypeSpecifier()) { 8153 // If we evaluated the type to a record type, suggest putting 8154 // a tag in front. 8155 if (const RecordType *RT = T->getAs<RecordType>()) { 8156 RecordDecl *RD = RT->getDecl(); 8157 8158 std::string InsertionText = std::string(" ") + RD->getKindName(); 8159 8160 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8161 << (unsigned) RD->getTagKind() 8162 << T 8163 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8164 InsertionText); 8165 } else { 8166 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8167 << T 8168 << SourceRange(FriendLoc, TypeRange.getEnd()); 8169 } 8170 } else if (T->getAs<EnumType>()) { 8171 Diag(FriendLoc, diag::ext_enum_friend) 8172 << T 8173 << SourceRange(FriendLoc, TypeRange.getEnd()); 8174 } 8175 } 8176 8177 // C++0x [class.friend]p3: 8178 // If the type specifier in a friend declaration designates a (possibly 8179 // cv-qualified) class type, that class is declared as a friend; otherwise, 8180 // the friend declaration is ignored. 8181 8182 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8183 // in [class.friend]p3 that we do not implement. 8184 8185 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8186} 8187 8188/// Handle a friend tag declaration where the scope specifier was 8189/// templated. 8190Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8191 unsigned TagSpec, SourceLocation TagLoc, 8192 CXXScopeSpec &SS, 8193 IdentifierInfo *Name, SourceLocation NameLoc, 8194 AttributeList *Attr, 8195 MultiTemplateParamsArg TempParamLists) { 8196 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8197 8198 bool isExplicitSpecialization = false; 8199 bool Invalid = false; 8200 8201 if (TemplateParameterList *TemplateParams 8202 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8203 TempParamLists.get(), 8204 TempParamLists.size(), 8205 /*friend*/ true, 8206 isExplicitSpecialization, 8207 Invalid)) { 8208 if (TemplateParams->size() > 0) { 8209 // This is a declaration of a class template. 8210 if (Invalid) 8211 return 0; 8212 8213 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8214 SS, Name, NameLoc, Attr, 8215 TemplateParams, AS_public, 8216 TempParamLists.size() - 1, 8217 (TemplateParameterList**) TempParamLists.release()).take(); 8218 } else { 8219 // The "template<>" header is extraneous. 8220 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8221 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8222 isExplicitSpecialization = true; 8223 } 8224 } 8225 8226 if (Invalid) return 0; 8227 8228 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8229 8230 bool isAllExplicitSpecializations = true; 8231 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8232 if (TempParamLists.get()[I]->size()) { 8233 isAllExplicitSpecializations = false; 8234 break; 8235 } 8236 } 8237 8238 // FIXME: don't ignore attributes. 8239 8240 // If it's explicit specializations all the way down, just forget 8241 // about the template header and build an appropriate non-templated 8242 // friend. TODO: for source fidelity, remember the headers. 8243 if (isAllExplicitSpecializations) { 8244 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8245 ElaboratedTypeKeyword Keyword 8246 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8247 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8248 *Name, NameLoc); 8249 if (T.isNull()) 8250 return 0; 8251 8252 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8253 if (isa<DependentNameType>(T)) { 8254 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8255 TL.setKeywordLoc(TagLoc); 8256 TL.setQualifierLoc(QualifierLoc); 8257 TL.setNameLoc(NameLoc); 8258 } else { 8259 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8260 TL.setKeywordLoc(TagLoc); 8261 TL.setQualifierLoc(QualifierLoc); 8262 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8263 } 8264 8265 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8266 TSI, FriendLoc); 8267 Friend->setAccess(AS_public); 8268 CurContext->addDecl(Friend); 8269 return Friend; 8270 } 8271 8272 // Handle the case of a templated-scope friend class. e.g. 8273 // template <class T> class A<T>::B; 8274 // FIXME: we don't support these right now. 8275 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8276 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8277 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8278 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8279 TL.setKeywordLoc(TagLoc); 8280 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8281 TL.setNameLoc(NameLoc); 8282 8283 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8284 TSI, FriendLoc); 8285 Friend->setAccess(AS_public); 8286 Friend->setUnsupportedFriend(true); 8287 CurContext->addDecl(Friend); 8288 return Friend; 8289} 8290 8291 8292/// Handle a friend type declaration. This works in tandem with 8293/// ActOnTag. 8294/// 8295/// Notes on friend class templates: 8296/// 8297/// We generally treat friend class declarations as if they were 8298/// declaring a class. So, for example, the elaborated type specifier 8299/// in a friend declaration is required to obey the restrictions of a 8300/// class-head (i.e. no typedefs in the scope chain), template 8301/// parameters are required to match up with simple template-ids, &c. 8302/// However, unlike when declaring a template specialization, it's 8303/// okay to refer to a template specialization without an empty 8304/// template parameter declaration, e.g. 8305/// friend class A<T>::B<unsigned>; 8306/// We permit this as a special case; if there are any template 8307/// parameters present at all, require proper matching, i.e. 8308/// template <> template <class T> friend class A<int>::B; 8309Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8310 MultiTemplateParamsArg TempParams) { 8311 SourceLocation Loc = DS.getSourceRange().getBegin(); 8312 8313 assert(DS.isFriendSpecified()); 8314 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8315 8316 // Try to convert the decl specifier to a type. This works for 8317 // friend templates because ActOnTag never produces a ClassTemplateDecl 8318 // for a TUK_Friend. 8319 Declarator TheDeclarator(DS, Declarator::MemberContext); 8320 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8321 QualType T = TSI->getType(); 8322 if (TheDeclarator.isInvalidType()) 8323 return 0; 8324 8325 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8326 return 0; 8327 8328 // This is definitely an error in C++98. It's probably meant to 8329 // be forbidden in C++0x, too, but the specification is just 8330 // poorly written. 8331 // 8332 // The problem is with declarations like the following: 8333 // template <T> friend A<T>::foo; 8334 // where deciding whether a class C is a friend or not now hinges 8335 // on whether there exists an instantiation of A that causes 8336 // 'foo' to equal C. There are restrictions on class-heads 8337 // (which we declare (by fiat) elaborated friend declarations to 8338 // be) that makes this tractable. 8339 // 8340 // FIXME: handle "template <> friend class A<T>;", which 8341 // is possibly well-formed? Who even knows? 8342 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8343 Diag(Loc, diag::err_tagless_friend_type_template) 8344 << DS.getSourceRange(); 8345 return 0; 8346 } 8347 8348 // C++98 [class.friend]p1: A friend of a class is a function 8349 // or class that is not a member of the class . . . 8350 // This is fixed in DR77, which just barely didn't make the C++03 8351 // deadline. It's also a very silly restriction that seriously 8352 // affects inner classes and which nobody else seems to implement; 8353 // thus we never diagnose it, not even in -pedantic. 8354 // 8355 // But note that we could warn about it: it's always useless to 8356 // friend one of your own members (it's not, however, worthless to 8357 // friend a member of an arbitrary specialization of your template). 8358 8359 Decl *D; 8360 if (unsigned NumTempParamLists = TempParams.size()) 8361 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8362 NumTempParamLists, 8363 TempParams.release(), 8364 TSI, 8365 DS.getFriendSpecLoc()); 8366 else 8367 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8368 8369 if (!D) 8370 return 0; 8371 8372 D->setAccess(AS_public); 8373 CurContext->addDecl(D); 8374 8375 return D; 8376} 8377 8378Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8379 MultiTemplateParamsArg TemplateParams) { 8380 const DeclSpec &DS = D.getDeclSpec(); 8381 8382 assert(DS.isFriendSpecified()); 8383 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8384 8385 SourceLocation Loc = D.getIdentifierLoc(); 8386 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8387 QualType T = TInfo->getType(); 8388 8389 // C++ [class.friend]p1 8390 // A friend of a class is a function or class.... 8391 // Note that this sees through typedefs, which is intended. 8392 // It *doesn't* see through dependent types, which is correct 8393 // according to [temp.arg.type]p3: 8394 // If a declaration acquires a function type through a 8395 // type dependent on a template-parameter and this causes 8396 // a declaration that does not use the syntactic form of a 8397 // function declarator to have a function type, the program 8398 // is ill-formed. 8399 if (!T->isFunctionType()) { 8400 Diag(Loc, diag::err_unexpected_friend); 8401 8402 // It might be worthwhile to try to recover by creating an 8403 // appropriate declaration. 8404 return 0; 8405 } 8406 8407 // C++ [namespace.memdef]p3 8408 // - If a friend declaration in a non-local class first declares a 8409 // class or function, the friend class or function is a member 8410 // of the innermost enclosing namespace. 8411 // - The name of the friend is not found by simple name lookup 8412 // until a matching declaration is provided in that namespace 8413 // scope (either before or after the class declaration granting 8414 // friendship). 8415 // - If a friend function is called, its name may be found by the 8416 // name lookup that considers functions from namespaces and 8417 // classes associated with the types of the function arguments. 8418 // - When looking for a prior declaration of a class or a function 8419 // declared as a friend, scopes outside the innermost enclosing 8420 // namespace scope are not considered. 8421 8422 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8423 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8424 DeclarationName Name = NameInfo.getName(); 8425 assert(Name); 8426 8427 // Check for unexpanded parameter packs. 8428 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8429 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8430 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8431 return 0; 8432 8433 // The context we found the declaration in, or in which we should 8434 // create the declaration. 8435 DeclContext *DC; 8436 Scope *DCScope = S; 8437 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8438 ForRedeclaration); 8439 8440 // FIXME: there are different rules in local classes 8441 8442 // There are four cases here. 8443 // - There's no scope specifier, in which case we just go to the 8444 // appropriate scope and look for a function or function template 8445 // there as appropriate. 8446 // Recover from invalid scope qualifiers as if they just weren't there. 8447 if (SS.isInvalid() || !SS.isSet()) { 8448 // C++0x [namespace.memdef]p3: 8449 // If the name in a friend declaration is neither qualified nor 8450 // a template-id and the declaration is a function or an 8451 // elaborated-type-specifier, the lookup to determine whether 8452 // the entity has been previously declared shall not consider 8453 // any scopes outside the innermost enclosing namespace. 8454 // C++0x [class.friend]p11: 8455 // If a friend declaration appears in a local class and the name 8456 // specified is an unqualified name, a prior declaration is 8457 // looked up without considering scopes that are outside the 8458 // innermost enclosing non-class scope. For a friend function 8459 // declaration, if there is no prior declaration, the program is 8460 // ill-formed. 8461 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8462 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8463 8464 // Find the appropriate context according to the above. 8465 DC = CurContext; 8466 while (true) { 8467 // Skip class contexts. If someone can cite chapter and verse 8468 // for this behavior, that would be nice --- it's what GCC and 8469 // EDG do, and it seems like a reasonable intent, but the spec 8470 // really only says that checks for unqualified existing 8471 // declarations should stop at the nearest enclosing namespace, 8472 // not that they should only consider the nearest enclosing 8473 // namespace. 8474 while (DC->isRecord()) 8475 DC = DC->getParent(); 8476 8477 LookupQualifiedName(Previous, DC); 8478 8479 // TODO: decide what we think about using declarations. 8480 if (isLocal || !Previous.empty()) 8481 break; 8482 8483 if (isTemplateId) { 8484 if (isa<TranslationUnitDecl>(DC)) break; 8485 } else { 8486 if (DC->isFileContext()) break; 8487 } 8488 DC = DC->getParent(); 8489 } 8490 8491 // C++ [class.friend]p1: A friend of a class is a function or 8492 // class that is not a member of the class . . . 8493 // C++0x changes this for both friend types and functions. 8494 // Most C++ 98 compilers do seem to give an error here, so 8495 // we do, too. 8496 if (!Previous.empty() && DC->Equals(CurContext) 8497 && !getLangOptions().CPlusPlus0x) 8498 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8499 8500 DCScope = getScopeForDeclContext(S, DC); 8501 8502 // - There's a non-dependent scope specifier, in which case we 8503 // compute it and do a previous lookup there for a function 8504 // or function template. 8505 } else if (!SS.getScopeRep()->isDependent()) { 8506 DC = computeDeclContext(SS); 8507 if (!DC) return 0; 8508 8509 if (RequireCompleteDeclContext(SS, DC)) return 0; 8510 8511 LookupQualifiedName(Previous, DC); 8512 8513 // Ignore things found implicitly in the wrong scope. 8514 // TODO: better diagnostics for this case. Suggesting the right 8515 // qualified scope would be nice... 8516 LookupResult::Filter F = Previous.makeFilter(); 8517 while (F.hasNext()) { 8518 NamedDecl *D = F.next(); 8519 if (!DC->InEnclosingNamespaceSetOf( 8520 D->getDeclContext()->getRedeclContext())) 8521 F.erase(); 8522 } 8523 F.done(); 8524 8525 if (Previous.empty()) { 8526 D.setInvalidType(); 8527 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8528 return 0; 8529 } 8530 8531 // C++ [class.friend]p1: A friend of a class is a function or 8532 // class that is not a member of the class . . . 8533 if (DC->Equals(CurContext)) 8534 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8535 8536 // - There's a scope specifier that does not match any template 8537 // parameter lists, in which case we use some arbitrary context, 8538 // create a method or method template, and wait for instantiation. 8539 // - There's a scope specifier that does match some template 8540 // parameter lists, which we don't handle right now. 8541 } else { 8542 DC = CurContext; 8543 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8544 } 8545 8546 if (!DC->isRecord()) { 8547 // This implies that it has to be an operator or function. 8548 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8549 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8550 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8551 Diag(Loc, diag::err_introducing_special_friend) << 8552 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8553 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8554 return 0; 8555 } 8556 } 8557 8558 bool Redeclaration = false; 8559 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8560 move(TemplateParams), 8561 IsDefinition, 8562 Redeclaration); 8563 if (!ND) return 0; 8564 8565 assert(ND->getDeclContext() == DC); 8566 assert(ND->getLexicalDeclContext() == CurContext); 8567 8568 // Add the function declaration to the appropriate lookup tables, 8569 // adjusting the redeclarations list as necessary. We don't 8570 // want to do this yet if the friending class is dependent. 8571 // 8572 // Also update the scope-based lookup if the target context's 8573 // lookup context is in lexical scope. 8574 if (!CurContext->isDependentContext()) { 8575 DC = DC->getRedeclContext(); 8576 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8577 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8578 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8579 } 8580 8581 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8582 D.getIdentifierLoc(), ND, 8583 DS.getFriendSpecLoc()); 8584 FrD->setAccess(AS_public); 8585 CurContext->addDecl(FrD); 8586 8587 if (ND->isInvalidDecl()) 8588 FrD->setInvalidDecl(); 8589 else { 8590 FunctionDecl *FD; 8591 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8592 FD = FTD->getTemplatedDecl(); 8593 else 8594 FD = cast<FunctionDecl>(ND); 8595 8596 // Mark templated-scope function declarations as unsupported. 8597 if (FD->getNumTemplateParameterLists()) 8598 FrD->setUnsupportedFriend(true); 8599 } 8600 8601 return ND; 8602} 8603 8604void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8605 AdjustDeclIfTemplate(Dcl); 8606 8607 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8608 if (!Fn) { 8609 Diag(DelLoc, diag::err_deleted_non_function); 8610 return; 8611 } 8612 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8613 Diag(DelLoc, diag::err_deleted_decl_not_first); 8614 Diag(Prev->getLocation(), diag::note_previous_declaration); 8615 // If the declaration wasn't the first, we delete the function anyway for 8616 // recovery. 8617 } 8618 Fn->setDeletedAsWritten(); 8619} 8620 8621void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8622 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8623 8624 if (MD) { 8625 CXXSpecialMember Member = getSpecialMember(MD); 8626 if (Member == CXXInvalid) { 8627 Diag(DefaultLoc, diag::err_default_special_members); 8628 return; 8629 } 8630 8631 MD->setDefaulted(); 8632 MD->setExplicitlyDefaulted(); 8633 8634 // We'll check it when the record is done 8635 if (MD == MD->getCanonicalDecl()) 8636 return; 8637 8638 switch (Member) { 8639 case CXXDefaultConstructor: { 8640 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8641 CheckExplicitlyDefaultedDefaultConstructor(CD); 8642 if (!CD->isInvalidDecl()) 8643 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8644 break; 8645 } 8646 8647 case CXXCopyConstructor: { 8648 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8649 CheckExplicitlyDefaultedCopyConstructor(CD); 8650 if (!CD->isInvalidDecl()) 8651 DefineImplicitCopyConstructor(DefaultLoc, CD); 8652 break; 8653 } 8654 8655 case CXXCopyAssignment: { 8656 CheckExplicitlyDefaultedCopyAssignment(MD); 8657 if (!MD->isInvalidDecl()) 8658 DefineImplicitCopyAssignment(DefaultLoc, MD); 8659 break; 8660 } 8661 8662 case CXXDestructor: { 8663 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8664 CheckExplicitlyDefaultedDestructor(DD); 8665 if (!DD->isInvalidDecl()) 8666 DefineImplicitDestructor(DefaultLoc, DD); 8667 break; 8668 } 8669 8670 default: 8671 // FIXME: Do the rest once we have move functions 8672 break; 8673 } 8674 } else { 8675 Diag(DefaultLoc, diag::err_default_special_members); 8676 } 8677} 8678 8679static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8680 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8681 Stmt *SubStmt = *CI; 8682 if (!SubStmt) 8683 continue; 8684 if (isa<ReturnStmt>(SubStmt)) 8685 Self.Diag(SubStmt->getSourceRange().getBegin(), 8686 diag::err_return_in_constructor_handler); 8687 if (!isa<Expr>(SubStmt)) 8688 SearchForReturnInStmt(Self, SubStmt); 8689 } 8690} 8691 8692void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8693 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8694 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8695 SearchForReturnInStmt(*this, Handler); 8696 } 8697} 8698 8699bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8700 const CXXMethodDecl *Old) { 8701 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8702 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8703 8704 if (Context.hasSameType(NewTy, OldTy) || 8705 NewTy->isDependentType() || OldTy->isDependentType()) 8706 return false; 8707 8708 // Check if the return types are covariant 8709 QualType NewClassTy, OldClassTy; 8710 8711 /// Both types must be pointers or references to classes. 8712 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8713 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8714 NewClassTy = NewPT->getPointeeType(); 8715 OldClassTy = OldPT->getPointeeType(); 8716 } 8717 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8718 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8719 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8720 NewClassTy = NewRT->getPointeeType(); 8721 OldClassTy = OldRT->getPointeeType(); 8722 } 8723 } 8724 } 8725 8726 // The return types aren't either both pointers or references to a class type. 8727 if (NewClassTy.isNull()) { 8728 Diag(New->getLocation(), 8729 diag::err_different_return_type_for_overriding_virtual_function) 8730 << New->getDeclName() << NewTy << OldTy; 8731 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8732 8733 return true; 8734 } 8735 8736 // C++ [class.virtual]p6: 8737 // If the return type of D::f differs from the return type of B::f, the 8738 // class type in the return type of D::f shall be complete at the point of 8739 // declaration of D::f or shall be the class type D. 8740 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8741 if (!RT->isBeingDefined() && 8742 RequireCompleteType(New->getLocation(), NewClassTy, 8743 PDiag(diag::err_covariant_return_incomplete) 8744 << New->getDeclName())) 8745 return true; 8746 } 8747 8748 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8749 // Check if the new class derives from the old class. 8750 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8751 Diag(New->getLocation(), 8752 diag::err_covariant_return_not_derived) 8753 << New->getDeclName() << NewTy << OldTy; 8754 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8755 return true; 8756 } 8757 8758 // Check if we the conversion from derived to base is valid. 8759 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8760 diag::err_covariant_return_inaccessible_base, 8761 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8762 // FIXME: Should this point to the return type? 8763 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8764 // FIXME: this note won't trigger for delayed access control 8765 // diagnostics, and it's impossible to get an undelayed error 8766 // here from access control during the original parse because 8767 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8768 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8769 return true; 8770 } 8771 } 8772 8773 // The qualifiers of the return types must be the same. 8774 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8775 Diag(New->getLocation(), 8776 diag::err_covariant_return_type_different_qualifications) 8777 << New->getDeclName() << NewTy << OldTy; 8778 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8779 return true; 8780 }; 8781 8782 8783 // The new class type must have the same or less qualifiers as the old type. 8784 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8785 Diag(New->getLocation(), 8786 diag::err_covariant_return_type_class_type_more_qualified) 8787 << New->getDeclName() << NewTy << OldTy; 8788 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8789 return true; 8790 }; 8791 8792 return false; 8793} 8794 8795/// \brief Mark the given method pure. 8796/// 8797/// \param Method the method to be marked pure. 8798/// 8799/// \param InitRange the source range that covers the "0" initializer. 8800bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8801 SourceLocation EndLoc = InitRange.getEnd(); 8802 if (EndLoc.isValid()) 8803 Method->setRangeEnd(EndLoc); 8804 8805 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8806 Method->setPure(); 8807 return false; 8808 } 8809 8810 if (!Method->isInvalidDecl()) 8811 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8812 << Method->getDeclName() << InitRange; 8813 return true; 8814} 8815 8816/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8817/// an initializer for the out-of-line declaration 'Dcl'. The scope 8818/// is a fresh scope pushed for just this purpose. 8819/// 8820/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8821/// static data member of class X, names should be looked up in the scope of 8822/// class X. 8823void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8824 // If there is no declaration, there was an error parsing it. 8825 if (D == 0 || D->isInvalidDecl()) return; 8826 8827 // We should only get called for declarations with scope specifiers, like: 8828 // int foo::bar; 8829 assert(D->isOutOfLine()); 8830 EnterDeclaratorContext(S, D->getDeclContext()); 8831} 8832 8833/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8834/// initializer for the out-of-line declaration 'D'. 8835void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8836 // If there is no declaration, there was an error parsing it. 8837 if (D == 0 || D->isInvalidDecl()) return; 8838 8839 assert(D->isOutOfLine()); 8840 ExitDeclaratorContext(S); 8841} 8842 8843/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8844/// C++ if/switch/while/for statement. 8845/// e.g: "if (int x = f()) {...}" 8846DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8847 // C++ 6.4p2: 8848 // The declarator shall not specify a function or an array. 8849 // The type-specifier-seq shall not contain typedef and shall not declare a 8850 // new class or enumeration. 8851 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8852 "Parser allowed 'typedef' as storage class of condition decl."); 8853 8854 TagDecl *OwnedTag = 0; 8855 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8856 QualType Ty = TInfo->getType(); 8857 8858 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8859 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8860 // would be created and CXXConditionDeclExpr wants a VarDecl. 8861 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8862 << D.getSourceRange(); 8863 return DeclResult(); 8864 } else if (OwnedTag && OwnedTag->isDefinition()) { 8865 // The type-specifier-seq shall not declare a new class or enumeration. 8866 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8867 } 8868 8869 Decl *Dcl = ActOnDeclarator(S, D); 8870 if (!Dcl) 8871 return DeclResult(); 8872 8873 return Dcl; 8874} 8875 8876void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8877 bool DefinitionRequired) { 8878 // Ignore any vtable uses in unevaluated operands or for classes that do 8879 // not have a vtable. 8880 if (!Class->isDynamicClass() || Class->isDependentContext() || 8881 CurContext->isDependentContext() || 8882 ExprEvalContexts.back().Context == Unevaluated) 8883 return; 8884 8885 // Try to insert this class into the map. 8886 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8887 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8888 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8889 if (!Pos.second) { 8890 // If we already had an entry, check to see if we are promoting this vtable 8891 // to required a definition. If so, we need to reappend to the VTableUses 8892 // list, since we may have already processed the first entry. 8893 if (DefinitionRequired && !Pos.first->second) { 8894 Pos.first->second = true; 8895 } else { 8896 // Otherwise, we can early exit. 8897 return; 8898 } 8899 } 8900 8901 // Local classes need to have their virtual members marked 8902 // immediately. For all other classes, we mark their virtual members 8903 // at the end of the translation unit. 8904 if (Class->isLocalClass()) 8905 MarkVirtualMembersReferenced(Loc, Class); 8906 else 8907 VTableUses.push_back(std::make_pair(Class, Loc)); 8908} 8909 8910bool Sema::DefineUsedVTables() { 8911 if (VTableUses.empty()) 8912 return false; 8913 8914 // Note: The VTableUses vector could grow as a result of marking 8915 // the members of a class as "used", so we check the size each 8916 // time through the loop and prefer indices (with are stable) to 8917 // iterators (which are not). 8918 bool DefinedAnything = false; 8919 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8920 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8921 if (!Class) 8922 continue; 8923 8924 SourceLocation Loc = VTableUses[I].second; 8925 8926 // If this class has a key function, but that key function is 8927 // defined in another translation unit, we don't need to emit the 8928 // vtable even though we're using it. 8929 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8930 if (KeyFunction && !KeyFunction->hasBody()) { 8931 switch (KeyFunction->getTemplateSpecializationKind()) { 8932 case TSK_Undeclared: 8933 case TSK_ExplicitSpecialization: 8934 case TSK_ExplicitInstantiationDeclaration: 8935 // The key function is in another translation unit. 8936 continue; 8937 8938 case TSK_ExplicitInstantiationDefinition: 8939 case TSK_ImplicitInstantiation: 8940 // We will be instantiating the key function. 8941 break; 8942 } 8943 } else if (!KeyFunction) { 8944 // If we have a class with no key function that is the subject 8945 // of an explicit instantiation declaration, suppress the 8946 // vtable; it will live with the explicit instantiation 8947 // definition. 8948 bool IsExplicitInstantiationDeclaration 8949 = Class->getTemplateSpecializationKind() 8950 == TSK_ExplicitInstantiationDeclaration; 8951 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8952 REnd = Class->redecls_end(); 8953 R != REnd; ++R) { 8954 TemplateSpecializationKind TSK 8955 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8956 if (TSK == TSK_ExplicitInstantiationDeclaration) 8957 IsExplicitInstantiationDeclaration = true; 8958 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8959 IsExplicitInstantiationDeclaration = false; 8960 break; 8961 } 8962 } 8963 8964 if (IsExplicitInstantiationDeclaration) 8965 continue; 8966 } 8967 8968 // Mark all of the virtual members of this class as referenced, so 8969 // that we can build a vtable. Then, tell the AST consumer that a 8970 // vtable for this class is required. 8971 DefinedAnything = true; 8972 MarkVirtualMembersReferenced(Loc, Class); 8973 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8974 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8975 8976 // Optionally warn if we're emitting a weak vtable. 8977 if (Class->getLinkage() == ExternalLinkage && 8978 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 8979 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 8980 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 8981 } 8982 } 8983 VTableUses.clear(); 8984 8985 return DefinedAnything; 8986} 8987 8988void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 8989 const CXXRecordDecl *RD) { 8990 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 8991 e = RD->method_end(); i != e; ++i) { 8992 CXXMethodDecl *MD = *i; 8993 8994 // C++ [basic.def.odr]p2: 8995 // [...] A virtual member function is used if it is not pure. [...] 8996 if (MD->isVirtual() && !MD->isPure()) 8997 MarkDeclarationReferenced(Loc, MD); 8998 } 8999 9000 // Only classes that have virtual bases need a VTT. 9001 if (RD->getNumVBases() == 0) 9002 return; 9003 9004 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9005 e = RD->bases_end(); i != e; ++i) { 9006 const CXXRecordDecl *Base = 9007 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9008 if (Base->getNumVBases() == 0) 9009 continue; 9010 MarkVirtualMembersReferenced(Loc, Base); 9011 } 9012} 9013 9014/// SetIvarInitializers - This routine builds initialization ASTs for the 9015/// Objective-C implementation whose ivars need be initialized. 9016void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9017 if (!getLangOptions().CPlusPlus) 9018 return; 9019 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9020 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9021 CollectIvarsToConstructOrDestruct(OID, ivars); 9022 if (ivars.empty()) 9023 return; 9024 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9025 for (unsigned i = 0; i < ivars.size(); i++) { 9026 FieldDecl *Field = ivars[i]; 9027 if (Field->isInvalidDecl()) 9028 continue; 9029 9030 CXXCtorInitializer *Member; 9031 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9032 InitializationKind InitKind = 9033 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9034 9035 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9036 ExprResult MemberInit = 9037 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9038 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9039 // Note, MemberInit could actually come back empty if no initialization 9040 // is required (e.g., because it would call a trivial default constructor) 9041 if (!MemberInit.get() || MemberInit.isInvalid()) 9042 continue; 9043 9044 Member = 9045 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9046 SourceLocation(), 9047 MemberInit.takeAs<Expr>(), 9048 SourceLocation()); 9049 AllToInit.push_back(Member); 9050 9051 // Be sure that the destructor is accessible and is marked as referenced. 9052 if (const RecordType *RecordTy 9053 = Context.getBaseElementType(Field->getType()) 9054 ->getAs<RecordType>()) { 9055 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9056 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9057 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9058 CheckDestructorAccess(Field->getLocation(), Destructor, 9059 PDiag(diag::err_access_dtor_ivar) 9060 << Context.getBaseElementType(Field->getType())); 9061 } 9062 } 9063 } 9064 ObjCImplementation->setIvarInitializers(Context, 9065 AllToInit.data(), AllToInit.size()); 9066 } 9067} 9068 9069static 9070void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9071 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9072 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9073 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9074 Sema &S) { 9075 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9076 CE = Current.end(); 9077 if (Ctor->isInvalidDecl()) 9078 return; 9079 9080 const FunctionDecl *FNTarget = 0; 9081 CXXConstructorDecl *Target; 9082 9083 // We ignore the result here since if we don't have a body, Target will be 9084 // null below. 9085 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9086 Target 9087= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9088 9089 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9090 // Avoid dereferencing a null pointer here. 9091 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9092 9093 if (!Current.insert(Canonical)) 9094 return; 9095 9096 // We know that beyond here, we aren't chaining into a cycle. 9097 if (!Target || !Target->isDelegatingConstructor() || 9098 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9099 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9100 Valid.insert(*CI); 9101 Current.clear(); 9102 // We've hit a cycle. 9103 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9104 Current.count(TCanonical)) { 9105 // If we haven't diagnosed this cycle yet, do so now. 9106 if (!Invalid.count(TCanonical)) { 9107 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9108 diag::warn_delegating_ctor_cycle) 9109 << Ctor; 9110 9111 // Don't add a note for a function delegating directo to itself. 9112 if (TCanonical != Canonical) 9113 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9114 9115 CXXConstructorDecl *C = Target; 9116 while (C->getCanonicalDecl() != Canonical) { 9117 (void)C->getTargetConstructor()->hasBody(FNTarget); 9118 assert(FNTarget && "Ctor cycle through bodiless function"); 9119 9120 C 9121 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9122 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9123 } 9124 } 9125 9126 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9127 Invalid.insert(*CI); 9128 Current.clear(); 9129 } else { 9130 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9131 } 9132} 9133 9134 9135void Sema::CheckDelegatingCtorCycles() { 9136 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9137 9138 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9139 CE = Current.end(); 9140 9141 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9142 I = DelegatingCtorDecls.begin(), 9143 E = DelegatingCtorDecls.end(); 9144 I != E; ++I) { 9145 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9146 } 9147 9148 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9149 (*CI)->setInvalidDecl(); 9150} 9151