SemaDeclCXX.cpp revision ffe37fdda5b4b4f162a45155c30d9f60ce110c12
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // If this function has a basic noexcept, it doesn't affect the outcome. 133 if (EST == EST_BasicNoexcept) 134 return; 135 136 // If we have a throw-all spec at this point, ignore the function. 137 if (ComputedEST == EST_None) 138 return; 139 140 // If we're still at noexcept(true) and there's a nothrow() callee, 141 // change to that specification. 142 if (EST == EST_DynamicNone) { 143 if (ComputedEST == EST_BasicNoexcept) 144 ComputedEST = EST_DynamicNone; 145 return; 146 } 147 148 // Check out noexcept specs. 149 if (EST == EST_ComputedNoexcept) { 150 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 151 assert(NR != FunctionProtoType::NR_NoNoexcept && 152 "Must have noexcept result for EST_ComputedNoexcept."); 153 assert(NR != FunctionProtoType::NR_Dependent && 154 "Should not generate implicit declarations for dependent cases, " 155 "and don't know how to handle them anyway."); 156 157 // noexcept(false) -> no spec on the new function 158 if (NR == FunctionProtoType::NR_Throw) { 159 ClearExceptions(); 160 ComputedEST = EST_None; 161 } 162 // noexcept(true) won't change anything either. 163 return; 164 } 165 166 assert(EST == EST_Dynamic && "EST case not considered earlier."); 167 assert(ComputedEST != EST_None && 168 "Shouldn't collect exceptions when throw-all is guaranteed."); 169 ComputedEST = EST_Dynamic; 170 // Record the exceptions in this function's exception specification. 171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 172 EEnd = Proto->exception_end(); 173 E != EEnd; ++E) 174 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 175 Exceptions.push_back(*E); 176} 177 178bool 179Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 180 SourceLocation EqualLoc) { 181 if (RequireCompleteType(Param->getLocation(), Param->getType(), 182 diag::err_typecheck_decl_incomplete_type)) { 183 Param->setInvalidDecl(); 184 return true; 185 } 186 187 // C++ [dcl.fct.default]p5 188 // A default argument expression is implicitly converted (clause 189 // 4) to the parameter type. The default argument expression has 190 // the same semantic constraints as the initializer expression in 191 // a declaration of a variable of the parameter type, using the 192 // copy-initialization semantics (8.5). 193 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 194 Param); 195 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 196 EqualLoc); 197 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 198 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 199 MultiExprArg(*this, &Arg, 1)); 200 if (Result.isInvalid()) 201 return true; 202 Arg = Result.takeAs<Expr>(); 203 204 CheckImplicitConversions(Arg, EqualLoc); 205 Arg = MaybeCreateExprWithCleanups(Arg); 206 207 // Okay: add the default argument to the parameter 208 Param->setDefaultArg(Arg); 209 210 // We have already instantiated this parameter; provide each of the 211 // instantiations with the uninstantiated default argument. 212 UnparsedDefaultArgInstantiationsMap::iterator InstPos 213 = UnparsedDefaultArgInstantiations.find(Param); 214 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 215 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 216 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 217 218 // We're done tracking this parameter's instantiations. 219 UnparsedDefaultArgInstantiations.erase(InstPos); 220 } 221 222 return false; 223} 224 225/// ActOnParamDefaultArgument - Check whether the default argument 226/// provided for a function parameter is well-formed. If so, attach it 227/// to the parameter declaration. 228void 229Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 230 Expr *DefaultArg) { 231 if (!param || !DefaultArg) 232 return; 233 234 ParmVarDecl *Param = cast<ParmVarDecl>(param); 235 UnparsedDefaultArgLocs.erase(Param); 236 237 // Default arguments are only permitted in C++ 238 if (!getLangOptions().CPlusPlus) { 239 Diag(EqualLoc, diag::err_param_default_argument) 240 << DefaultArg->getSourceRange(); 241 Param->setInvalidDecl(); 242 return; 243 } 244 245 // Check for unexpanded parameter packs. 246 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 247 Param->setInvalidDecl(); 248 return; 249 } 250 251 // Check that the default argument is well-formed 252 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 253 if (DefaultArgChecker.Visit(DefaultArg)) { 254 Param->setInvalidDecl(); 255 return; 256 } 257 258 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 259} 260 261/// ActOnParamUnparsedDefaultArgument - We've seen a default 262/// argument for a function parameter, but we can't parse it yet 263/// because we're inside a class definition. Note that this default 264/// argument will be parsed later. 265void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 266 SourceLocation EqualLoc, 267 SourceLocation ArgLoc) { 268 if (!param) 269 return; 270 271 ParmVarDecl *Param = cast<ParmVarDecl>(param); 272 if (Param) 273 Param->setUnparsedDefaultArg(); 274 275 UnparsedDefaultArgLocs[Param] = ArgLoc; 276} 277 278/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 279/// the default argument for the parameter param failed. 280void Sema::ActOnParamDefaultArgumentError(Decl *param) { 281 if (!param) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 286 Param->setInvalidDecl(); 287 288 UnparsedDefaultArgLocs.erase(Param); 289} 290 291/// CheckExtraCXXDefaultArguments - Check for any extra default 292/// arguments in the declarator, which is not a function declaration 293/// or definition and therefore is not permitted to have default 294/// arguments. This routine should be invoked for every declarator 295/// that is not a function declaration or definition. 296void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 297 // C++ [dcl.fct.default]p3 298 // A default argument expression shall be specified only in the 299 // parameter-declaration-clause of a function declaration or in a 300 // template-parameter (14.1). It shall not be specified for a 301 // parameter pack. If it is specified in a 302 // parameter-declaration-clause, it shall not occur within a 303 // declarator or abstract-declarator of a parameter-declaration. 304 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 305 DeclaratorChunk &chunk = D.getTypeObject(i); 306 if (chunk.Kind == DeclaratorChunk::Function) { 307 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 308 ParmVarDecl *Param = 309 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 310 if (Param->hasUnparsedDefaultArg()) { 311 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 312 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 313 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 314 delete Toks; 315 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 316 } else if (Param->getDefaultArg()) { 317 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 318 << Param->getDefaultArg()->getSourceRange(); 319 Param->setDefaultArg(0); 320 } 321 } 322 } 323 } 324} 325 326// MergeCXXFunctionDecl - Merge two declarations of the same C++ 327// function, once we already know that they have the same 328// type. Subroutine of MergeFunctionDecl. Returns true if there was an 329// error, false otherwise. 330bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 331 bool Invalid = false; 332 333 // C++ [dcl.fct.default]p4: 334 // For non-template functions, default arguments can be added in 335 // later declarations of a function in the same 336 // scope. Declarations in different scopes have completely 337 // distinct sets of default arguments. That is, declarations in 338 // inner scopes do not acquire default arguments from 339 // declarations in outer scopes, and vice versa. In a given 340 // function declaration, all parameters subsequent to a 341 // parameter with a default argument shall have default 342 // arguments supplied in this or previous declarations. A 343 // default argument shall not be redefined by a later 344 // declaration (not even to the same value). 345 // 346 // C++ [dcl.fct.default]p6: 347 // Except for member functions of class templates, the default arguments 348 // in a member function definition that appears outside of the class 349 // definition are added to the set of default arguments provided by the 350 // member function declaration in the class definition. 351 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 352 ParmVarDecl *OldParam = Old->getParamDecl(p); 353 ParmVarDecl *NewParam = New->getParamDecl(p); 354 355 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 356 357 unsigned DiagDefaultParamID = 358 diag::err_param_default_argument_redefinition; 359 360 // MSVC accepts that default parameters be redefined for member functions 361 // of template class. The new default parameter's value is ignored. 362 Invalid = true; 363 if (getLangOptions().Microsoft) { 364 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 365 if (MD && MD->getParent()->getDescribedClassTemplate()) { 366 // Merge the old default argument into the new parameter. 367 NewParam->setHasInheritedDefaultArg(); 368 if (OldParam->hasUninstantiatedDefaultArg()) 369 NewParam->setUninstantiatedDefaultArg( 370 OldParam->getUninstantiatedDefaultArg()); 371 else 372 NewParam->setDefaultArg(OldParam->getInit()); 373 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 374 Invalid = false; 375 } 376 } 377 378 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 379 // hint here. Alternatively, we could walk the type-source information 380 // for NewParam to find the last source location in the type... but it 381 // isn't worth the effort right now. This is the kind of test case that 382 // is hard to get right: 383 // int f(int); 384 // void g(int (*fp)(int) = f); 385 // void g(int (*fp)(int) = &f); 386 Diag(NewParam->getLocation(), DiagDefaultParamID) 387 << NewParam->getDefaultArgRange(); 388 389 // Look for the function declaration where the default argument was 390 // actually written, which may be a declaration prior to Old. 391 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 392 Older; Older = Older->getPreviousDeclaration()) { 393 if (!Older->getParamDecl(p)->hasDefaultArg()) 394 break; 395 396 OldParam = Older->getParamDecl(p); 397 } 398 399 Diag(OldParam->getLocation(), diag::note_previous_definition) 400 << OldParam->getDefaultArgRange(); 401 } else if (OldParam->hasDefaultArg()) { 402 // Merge the old default argument into the new parameter. 403 // It's important to use getInit() here; getDefaultArg() 404 // strips off any top-level ExprWithCleanups. 405 NewParam->setHasInheritedDefaultArg(); 406 if (OldParam->hasUninstantiatedDefaultArg()) 407 NewParam->setUninstantiatedDefaultArg( 408 OldParam->getUninstantiatedDefaultArg()); 409 else 410 NewParam->setDefaultArg(OldParam->getInit()); 411 } else if (NewParam->hasDefaultArg()) { 412 if (New->getDescribedFunctionTemplate()) { 413 // Paragraph 4, quoted above, only applies to non-template functions. 414 Diag(NewParam->getLocation(), 415 diag::err_param_default_argument_template_redecl) 416 << NewParam->getDefaultArgRange(); 417 Diag(Old->getLocation(), diag::note_template_prev_declaration) 418 << false; 419 } else if (New->getTemplateSpecializationKind() 420 != TSK_ImplicitInstantiation && 421 New->getTemplateSpecializationKind() != TSK_Undeclared) { 422 // C++ [temp.expr.spec]p21: 423 // Default function arguments shall not be specified in a declaration 424 // or a definition for one of the following explicit specializations: 425 // - the explicit specialization of a function template; 426 // - the explicit specialization of a member function template; 427 // - the explicit specialization of a member function of a class 428 // template where the class template specialization to which the 429 // member function specialization belongs is implicitly 430 // instantiated. 431 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 432 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 433 << New->getDeclName() 434 << NewParam->getDefaultArgRange(); 435 } else if (New->getDeclContext()->isDependentContext()) { 436 // C++ [dcl.fct.default]p6 (DR217): 437 // Default arguments for a member function of a class template shall 438 // be specified on the initial declaration of the member function 439 // within the class template. 440 // 441 // Reading the tea leaves a bit in DR217 and its reference to DR205 442 // leads me to the conclusion that one cannot add default function 443 // arguments for an out-of-line definition of a member function of a 444 // dependent type. 445 int WhichKind = 2; 446 if (CXXRecordDecl *Record 447 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 448 if (Record->getDescribedClassTemplate()) 449 WhichKind = 0; 450 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 451 WhichKind = 1; 452 else 453 WhichKind = 2; 454 } 455 456 Diag(NewParam->getLocation(), 457 diag::err_param_default_argument_member_template_redecl) 458 << WhichKind 459 << NewParam->getDefaultArgRange(); 460 } 461 } 462 } 463 464 if (CheckEquivalentExceptionSpec(Old, New)) 465 Invalid = true; 466 467 return Invalid; 468} 469 470/// \brief Merge the exception specifications of two variable declarations. 471/// 472/// This is called when there's a redeclaration of a VarDecl. The function 473/// checks if the redeclaration might have an exception specification and 474/// validates compatibility and merges the specs if necessary. 475void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 476 // Shortcut if exceptions are disabled. 477 if (!getLangOptions().CXXExceptions) 478 return; 479 480 assert(Context.hasSameType(New->getType(), Old->getType()) && 481 "Should only be called if types are otherwise the same."); 482 483 QualType NewType = New->getType(); 484 QualType OldType = Old->getType(); 485 486 // We're only interested in pointers and references to functions, as well 487 // as pointers to member functions. 488 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 489 NewType = R->getPointeeType(); 490 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 491 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 492 NewType = P->getPointeeType(); 493 OldType = OldType->getAs<PointerType>()->getPointeeType(); 494 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 495 NewType = M->getPointeeType(); 496 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 497 } 498 499 if (!NewType->isFunctionProtoType()) 500 return; 501 502 // There's lots of special cases for functions. For function pointers, system 503 // libraries are hopefully not as broken so that we don't need these 504 // workarounds. 505 if (CheckEquivalentExceptionSpec( 506 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 507 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 508 New->setInvalidDecl(); 509 } 510} 511 512/// CheckCXXDefaultArguments - Verify that the default arguments for a 513/// function declaration are well-formed according to C++ 514/// [dcl.fct.default]. 515void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 516 unsigned NumParams = FD->getNumParams(); 517 unsigned p; 518 519 // Find first parameter with a default argument 520 for (p = 0; p < NumParams; ++p) { 521 ParmVarDecl *Param = FD->getParamDecl(p); 522 if (Param->hasDefaultArg()) 523 break; 524 } 525 526 // C++ [dcl.fct.default]p4: 527 // In a given function declaration, all parameters 528 // subsequent to a parameter with a default argument shall 529 // have default arguments supplied in this or previous 530 // declarations. A default argument shall not be redefined 531 // by a later declaration (not even to the same value). 532 unsigned LastMissingDefaultArg = 0; 533 for (; p < NumParams; ++p) { 534 ParmVarDecl *Param = FD->getParamDecl(p); 535 if (!Param->hasDefaultArg()) { 536 if (Param->isInvalidDecl()) 537 /* We already complained about this parameter. */; 538 else if (Param->getIdentifier()) 539 Diag(Param->getLocation(), 540 diag::err_param_default_argument_missing_name) 541 << Param->getIdentifier(); 542 else 543 Diag(Param->getLocation(), 544 diag::err_param_default_argument_missing); 545 546 LastMissingDefaultArg = p; 547 } 548 } 549 550 if (LastMissingDefaultArg > 0) { 551 // Some default arguments were missing. Clear out all of the 552 // default arguments up to (and including) the last missing 553 // default argument, so that we leave the function parameters 554 // in a semantically valid state. 555 for (p = 0; p <= LastMissingDefaultArg; ++p) { 556 ParmVarDecl *Param = FD->getParamDecl(p); 557 if (Param->hasDefaultArg()) { 558 Param->setDefaultArg(0); 559 } 560 } 561 } 562} 563 564/// isCurrentClassName - Determine whether the identifier II is the 565/// name of the class type currently being defined. In the case of 566/// nested classes, this will only return true if II is the name of 567/// the innermost class. 568bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 569 const CXXScopeSpec *SS) { 570 assert(getLangOptions().CPlusPlus && "No class names in C!"); 571 572 CXXRecordDecl *CurDecl; 573 if (SS && SS->isSet() && !SS->isInvalid()) { 574 DeclContext *DC = computeDeclContext(*SS, true); 575 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 576 } else 577 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 578 579 if (CurDecl && CurDecl->getIdentifier()) 580 return &II == CurDecl->getIdentifier(); 581 else 582 return false; 583} 584 585/// \brief Check the validity of a C++ base class specifier. 586/// 587/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 588/// and returns NULL otherwise. 589CXXBaseSpecifier * 590Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 591 SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeSourceInfo *TInfo, 594 SourceLocation EllipsisLoc) { 595 QualType BaseType = TInfo->getType(); 596 597 // C++ [class.union]p1: 598 // A union shall not have base classes. 599 if (Class->isUnion()) { 600 Diag(Class->getLocation(), diag::err_base_clause_on_union) 601 << SpecifierRange; 602 return 0; 603 } 604 605 if (EllipsisLoc.isValid() && 606 !TInfo->getType()->containsUnexpandedParameterPack()) { 607 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 608 << TInfo->getTypeLoc().getSourceRange(); 609 EllipsisLoc = SourceLocation(); 610 } 611 612 if (BaseType->isDependentType()) 613 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 614 Class->getTagKind() == TTK_Class, 615 Access, TInfo, EllipsisLoc); 616 617 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 618 619 // Base specifiers must be record types. 620 if (!BaseType->isRecordType()) { 621 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 622 return 0; 623 } 624 625 // C++ [class.union]p1: 626 // A union shall not be used as a base class. 627 if (BaseType->isUnionType()) { 628 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 629 return 0; 630 } 631 632 // C++ [class.derived]p2: 633 // The class-name in a base-specifier shall not be an incompletely 634 // defined class. 635 if (RequireCompleteType(BaseLoc, BaseType, 636 PDiag(diag::err_incomplete_base_class) 637 << SpecifierRange)) { 638 Class->setInvalidDecl(); 639 return 0; 640 } 641 642 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 643 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 644 assert(BaseDecl && "Record type has no declaration"); 645 BaseDecl = BaseDecl->getDefinition(); 646 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 647 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 648 assert(CXXBaseDecl && "Base type is not a C++ type"); 649 650 // C++ [class]p3: 651 // If a class is marked final and it appears as a base-type-specifier in 652 // base-clause, the program is ill-formed. 653 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 654 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 655 << CXXBaseDecl->getDeclName(); 656 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 657 << CXXBaseDecl->getDeclName(); 658 return 0; 659 } 660 661 if (BaseDecl->isInvalidDecl()) 662 Class->setInvalidDecl(); 663 664 // Create the base specifier. 665 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 666 Class->getTagKind() == TTK_Class, 667 Access, TInfo, EllipsisLoc); 668} 669 670/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 671/// one entry in the base class list of a class specifier, for 672/// example: 673/// class foo : public bar, virtual private baz { 674/// 'public bar' and 'virtual private baz' are each base-specifiers. 675BaseResult 676Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 677 bool Virtual, AccessSpecifier Access, 678 ParsedType basetype, SourceLocation BaseLoc, 679 SourceLocation EllipsisLoc) { 680 if (!classdecl) 681 return true; 682 683 AdjustDeclIfTemplate(classdecl); 684 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 685 if (!Class) 686 return true; 687 688 TypeSourceInfo *TInfo = 0; 689 GetTypeFromParser(basetype, &TInfo); 690 691 if (EllipsisLoc.isInvalid() && 692 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 693 UPPC_BaseType)) 694 return true; 695 696 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 697 Virtual, Access, TInfo, 698 EllipsisLoc)) 699 return BaseSpec; 700 701 return true; 702} 703 704/// \brief Performs the actual work of attaching the given base class 705/// specifiers to a C++ class. 706bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 707 unsigned NumBases) { 708 if (NumBases == 0) 709 return false; 710 711 // Used to keep track of which base types we have already seen, so 712 // that we can properly diagnose redundant direct base types. Note 713 // that the key is always the unqualified canonical type of the base 714 // class. 715 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 716 717 // Copy non-redundant base specifiers into permanent storage. 718 unsigned NumGoodBases = 0; 719 bool Invalid = false; 720 for (unsigned idx = 0; idx < NumBases; ++idx) { 721 QualType NewBaseType 722 = Context.getCanonicalType(Bases[idx]->getType()); 723 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 724 if (!Class->hasObjectMember()) { 725 if (const RecordType *FDTTy = 726 NewBaseType.getTypePtr()->getAs<RecordType>()) 727 if (FDTTy->getDecl()->hasObjectMember()) 728 Class->setHasObjectMember(true); 729 } 730 731 if (KnownBaseTypes[NewBaseType]) { 732 // C++ [class.mi]p3: 733 // A class shall not be specified as a direct base class of a 734 // derived class more than once. 735 Diag(Bases[idx]->getSourceRange().getBegin(), 736 diag::err_duplicate_base_class) 737 << KnownBaseTypes[NewBaseType]->getType() 738 << Bases[idx]->getSourceRange(); 739 740 // Delete the duplicate base class specifier; we're going to 741 // overwrite its pointer later. 742 Context.Deallocate(Bases[idx]); 743 744 Invalid = true; 745 } else { 746 // Okay, add this new base class. 747 KnownBaseTypes[NewBaseType] = Bases[idx]; 748 Bases[NumGoodBases++] = Bases[idx]; 749 } 750 } 751 752 // Attach the remaining base class specifiers to the derived class. 753 Class->setBases(Bases, NumGoodBases); 754 755 // Delete the remaining (good) base class specifiers, since their 756 // data has been copied into the CXXRecordDecl. 757 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 758 Context.Deallocate(Bases[idx]); 759 760 return Invalid; 761} 762 763/// ActOnBaseSpecifiers - Attach the given base specifiers to the 764/// class, after checking whether there are any duplicate base 765/// classes. 766void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 767 unsigned NumBases) { 768 if (!ClassDecl || !Bases || !NumBases) 769 return; 770 771 AdjustDeclIfTemplate(ClassDecl); 772 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 773 (CXXBaseSpecifier**)(Bases), NumBases); 774} 775 776static CXXRecordDecl *GetClassForType(QualType T) { 777 if (const RecordType *RT = T->getAs<RecordType>()) 778 return cast<CXXRecordDecl>(RT->getDecl()); 779 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 780 return ICT->getDecl(); 781 else 782 return 0; 783} 784 785/// \brief Determine whether the type \p Derived is a C++ class that is 786/// derived from the type \p Base. 787bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 788 if (!getLangOptions().CPlusPlus) 789 return false; 790 791 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 792 if (!DerivedRD) 793 return false; 794 795 CXXRecordDecl *BaseRD = GetClassForType(Base); 796 if (!BaseRD) 797 return false; 798 799 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 800 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 801} 802 803/// \brief Determine whether the type \p Derived is a C++ class that is 804/// derived from the type \p Base. 805bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 810 if (!DerivedRD) 811 return false; 812 813 CXXRecordDecl *BaseRD = GetClassForType(Base); 814 if (!BaseRD) 815 return false; 816 817 return DerivedRD->isDerivedFrom(BaseRD, Paths); 818} 819 820void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 821 CXXCastPath &BasePathArray) { 822 assert(BasePathArray.empty() && "Base path array must be empty!"); 823 assert(Paths.isRecordingPaths() && "Must record paths!"); 824 825 const CXXBasePath &Path = Paths.front(); 826 827 // We first go backward and check if we have a virtual base. 828 // FIXME: It would be better if CXXBasePath had the base specifier for 829 // the nearest virtual base. 830 unsigned Start = 0; 831 for (unsigned I = Path.size(); I != 0; --I) { 832 if (Path[I - 1].Base->isVirtual()) { 833 Start = I - 1; 834 break; 835 } 836 } 837 838 // Now add all bases. 839 for (unsigned I = Start, E = Path.size(); I != E; ++I) 840 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 841} 842 843/// \brief Determine whether the given base path includes a virtual 844/// base class. 845bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 846 for (CXXCastPath::const_iterator B = BasePath.begin(), 847 BEnd = BasePath.end(); 848 B != BEnd; ++B) 849 if ((*B)->isVirtual()) 850 return true; 851 852 return false; 853} 854 855/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 856/// conversion (where Derived and Base are class types) is 857/// well-formed, meaning that the conversion is unambiguous (and 858/// that all of the base classes are accessible). Returns true 859/// and emits a diagnostic if the code is ill-formed, returns false 860/// otherwise. Loc is the location where this routine should point to 861/// if there is an error, and Range is the source range to highlight 862/// if there is an error. 863bool 864Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 865 unsigned InaccessibleBaseID, 866 unsigned AmbigiousBaseConvID, 867 SourceLocation Loc, SourceRange Range, 868 DeclarationName Name, 869 CXXCastPath *BasePath) { 870 // First, determine whether the path from Derived to Base is 871 // ambiguous. This is slightly more expensive than checking whether 872 // the Derived to Base conversion exists, because here we need to 873 // explore multiple paths to determine if there is an ambiguity. 874 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 875 /*DetectVirtual=*/false); 876 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 877 assert(DerivationOkay && 878 "Can only be used with a derived-to-base conversion"); 879 (void)DerivationOkay; 880 881 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 882 if (InaccessibleBaseID) { 883 // Check that the base class can be accessed. 884 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 885 InaccessibleBaseID)) { 886 case AR_inaccessible: 887 return true; 888 case AR_accessible: 889 case AR_dependent: 890 case AR_delayed: 891 break; 892 } 893 } 894 895 // Build a base path if necessary. 896 if (BasePath) 897 BuildBasePathArray(Paths, *BasePath); 898 return false; 899 } 900 901 // We know that the derived-to-base conversion is ambiguous, and 902 // we're going to produce a diagnostic. Perform the derived-to-base 903 // search just one more time to compute all of the possible paths so 904 // that we can print them out. This is more expensive than any of 905 // the previous derived-to-base checks we've done, but at this point 906 // performance isn't as much of an issue. 907 Paths.clear(); 908 Paths.setRecordingPaths(true); 909 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 910 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 911 (void)StillOkay; 912 913 // Build up a textual representation of the ambiguous paths, e.g., 914 // D -> B -> A, that will be used to illustrate the ambiguous 915 // conversions in the diagnostic. We only print one of the paths 916 // to each base class subobject. 917 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 918 919 Diag(Loc, AmbigiousBaseConvID) 920 << Derived << Base << PathDisplayStr << Range << Name; 921 return true; 922} 923 924bool 925Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 926 SourceLocation Loc, SourceRange Range, 927 CXXCastPath *BasePath, 928 bool IgnoreAccess) { 929 return CheckDerivedToBaseConversion(Derived, Base, 930 IgnoreAccess ? 0 931 : diag::err_upcast_to_inaccessible_base, 932 diag::err_ambiguous_derived_to_base_conv, 933 Loc, Range, DeclarationName(), 934 BasePath); 935} 936 937 938/// @brief Builds a string representing ambiguous paths from a 939/// specific derived class to different subobjects of the same base 940/// class. 941/// 942/// This function builds a string that can be used in error messages 943/// to show the different paths that one can take through the 944/// inheritance hierarchy to go from the derived class to different 945/// subobjects of a base class. The result looks something like this: 946/// @code 947/// struct D -> struct B -> struct A 948/// struct D -> struct C -> struct A 949/// @endcode 950std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 951 std::string PathDisplayStr; 952 std::set<unsigned> DisplayedPaths; 953 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 954 Path != Paths.end(); ++Path) { 955 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 956 // We haven't displayed a path to this particular base 957 // class subobject yet. 958 PathDisplayStr += "\n "; 959 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 960 for (CXXBasePath::const_iterator Element = Path->begin(); 961 Element != Path->end(); ++Element) 962 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 963 } 964 } 965 966 return PathDisplayStr; 967} 968 969//===----------------------------------------------------------------------===// 970// C++ class member Handling 971//===----------------------------------------------------------------------===// 972 973/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 974Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 975 SourceLocation ASLoc, 976 SourceLocation ColonLoc) { 977 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 978 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 979 ASLoc, ColonLoc); 980 CurContext->addHiddenDecl(ASDecl); 981 return ASDecl; 982} 983 984/// CheckOverrideControl - Check C++0x override control semantics. 985void Sema::CheckOverrideControl(const Decl *D) { 986 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 987 if (!MD || !MD->isVirtual()) 988 return; 989 990 if (MD->isDependentContext()) 991 return; 992 993 // C++0x [class.virtual]p3: 994 // If a virtual function is marked with the virt-specifier override and does 995 // not override a member function of a base class, 996 // the program is ill-formed. 997 bool HasOverriddenMethods = 998 MD->begin_overridden_methods() != MD->end_overridden_methods(); 999 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1000 Diag(MD->getLocation(), 1001 diag::err_function_marked_override_not_overriding) 1002 << MD->getDeclName(); 1003 return; 1004 } 1005} 1006 1007/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1008/// function overrides a virtual member function marked 'final', according to 1009/// C++0x [class.virtual]p3. 1010bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1011 const CXXMethodDecl *Old) { 1012 if (!Old->hasAttr<FinalAttr>()) 1013 return false; 1014 1015 Diag(New->getLocation(), diag::err_final_function_overridden) 1016 << New->getDeclName(); 1017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1018 return true; 1019} 1020 1021/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1022/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1023/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1024/// any. 1025Decl * 1026Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1027 MultiTemplateParamsArg TemplateParameterLists, 1028 ExprTy *BW, const VirtSpecifiers &VS, 1029 ExprTy *InitExpr, bool IsDefinition) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (SS.isSet() && !SS.isInvalid()) { 1095 // The user provided a superfluous scope specifier inside a class 1096 // definition: 1097 // 1098 // class X { 1099 // int X::member; 1100 // }; 1101 DeclContext *DC = 0; 1102 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1103 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1104 << Name << FixItHint::CreateRemoval(SS.getRange()); 1105 else 1106 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1107 << Name << SS.getRange(); 1108 1109 SS.clear(); 1110 } 1111 1112 // FIXME: Check for template parameters! 1113 // FIXME: Check that the name is an identifier! 1114 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1115 AS); 1116 assert(Member && "HandleField never returns null"); 1117 } else { 1118 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1119 if (!Member) { 1120 return 0; 1121 } 1122 1123 // Non-instance-fields can't have a bitfield. 1124 if (BitWidth) { 1125 if (Member->isInvalidDecl()) { 1126 // don't emit another diagnostic. 1127 } else if (isa<VarDecl>(Member)) { 1128 // C++ 9.6p3: A bit-field shall not be a static member. 1129 // "static member 'A' cannot be a bit-field" 1130 Diag(Loc, diag::err_static_not_bitfield) 1131 << Name << BitWidth->getSourceRange(); 1132 } else if (isa<TypedefDecl>(Member)) { 1133 // "typedef member 'x' cannot be a bit-field" 1134 Diag(Loc, diag::err_typedef_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else { 1137 // A function typedef ("typedef int f(); f a;"). 1138 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1139 Diag(Loc, diag::err_not_integral_type_bitfield) 1140 << Name << cast<ValueDecl>(Member)->getType() 1141 << BitWidth->getSourceRange(); 1142 } 1143 1144 BitWidth = 0; 1145 Member->setInvalidDecl(); 1146 } 1147 1148 Member->setAccess(AS); 1149 1150 // If we have declared a member function template, set the access of the 1151 // templated declaration as well. 1152 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1153 FunTmpl->getTemplatedDecl()->setAccess(AS); 1154 } 1155 1156 if (VS.isOverrideSpecified()) { 1157 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1158 if (!MD || !MD->isVirtual()) { 1159 Diag(Member->getLocStart(), 1160 diag::override_keyword_only_allowed_on_virtual_member_functions) 1161 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1162 } else 1163 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1164 } 1165 if (VS.isFinalSpecified()) { 1166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1167 if (!MD || !MD->isVirtual()) { 1168 Diag(Member->getLocStart(), 1169 diag::override_keyword_only_allowed_on_virtual_member_functions) 1170 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1171 } else 1172 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1173 } 1174 1175 if (VS.getLastLocation().isValid()) { 1176 // Update the end location of a method that has a virt-specifiers. 1177 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1178 MD->setRangeEnd(VS.getLastLocation()); 1179 } 1180 1181 CheckOverrideControl(Member); 1182 1183 assert((Name || isInstField) && "No identifier for non-field ?"); 1184 1185 if (Init) 1186 AddInitializerToDecl(Member, Init, false, 1187 DS.getTypeSpecType() == DeclSpec::TST_auto); 1188 1189 FinalizeDeclaration(Member); 1190 1191 if (isInstField) 1192 FieldCollector->Add(cast<FieldDecl>(Member)); 1193 return Member; 1194} 1195 1196/// \brief Find the direct and/or virtual base specifiers that 1197/// correspond to the given base type, for use in base initialization 1198/// within a constructor. 1199static bool FindBaseInitializer(Sema &SemaRef, 1200 CXXRecordDecl *ClassDecl, 1201 QualType BaseType, 1202 const CXXBaseSpecifier *&DirectBaseSpec, 1203 const CXXBaseSpecifier *&VirtualBaseSpec) { 1204 // First, check for a direct base class. 1205 DirectBaseSpec = 0; 1206 for (CXXRecordDecl::base_class_const_iterator Base 1207 = ClassDecl->bases_begin(); 1208 Base != ClassDecl->bases_end(); ++Base) { 1209 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1210 // We found a direct base of this type. That's what we're 1211 // initializing. 1212 DirectBaseSpec = &*Base; 1213 break; 1214 } 1215 } 1216 1217 // Check for a virtual base class. 1218 // FIXME: We might be able to short-circuit this if we know in advance that 1219 // there are no virtual bases. 1220 VirtualBaseSpec = 0; 1221 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1222 // We haven't found a base yet; search the class hierarchy for a 1223 // virtual base class. 1224 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1225 /*DetectVirtual=*/false); 1226 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1227 BaseType, Paths)) { 1228 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1229 Path != Paths.end(); ++Path) { 1230 if (Path->back().Base->isVirtual()) { 1231 VirtualBaseSpec = Path->back().Base; 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 1238 return DirectBaseSpec || VirtualBaseSpec; 1239} 1240 1241/// ActOnMemInitializer - Handle a C++ member initializer. 1242MemInitResult 1243Sema::ActOnMemInitializer(Decl *ConstructorD, 1244 Scope *S, 1245 CXXScopeSpec &SS, 1246 IdentifierInfo *MemberOrBase, 1247 ParsedType TemplateTypeTy, 1248 SourceLocation IdLoc, 1249 SourceLocation LParenLoc, 1250 ExprTy **Args, unsigned NumArgs, 1251 SourceLocation RParenLoc, 1252 SourceLocation EllipsisLoc) { 1253 if (!ConstructorD) 1254 return true; 1255 1256 AdjustDeclIfTemplate(ConstructorD); 1257 1258 CXXConstructorDecl *Constructor 1259 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1260 if (!Constructor) { 1261 // The user wrote a constructor initializer on a function that is 1262 // not a C++ constructor. Ignore the error for now, because we may 1263 // have more member initializers coming; we'll diagnose it just 1264 // once in ActOnMemInitializers. 1265 return true; 1266 } 1267 1268 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1269 1270 // C++ [class.base.init]p2: 1271 // Names in a mem-initializer-id are looked up in the scope of the 1272 // constructor's class and, if not found in that scope, are looked 1273 // up in the scope containing the constructor's definition. 1274 // [Note: if the constructor's class contains a member with the 1275 // same name as a direct or virtual base class of the class, a 1276 // mem-initializer-id naming the member or base class and composed 1277 // of a single identifier refers to the class member. A 1278 // mem-initializer-id for the hidden base class may be specified 1279 // using a qualified name. ] 1280 if (!SS.getScopeRep() && !TemplateTypeTy) { 1281 // Look for a member, first. 1282 FieldDecl *Member = 0; 1283 DeclContext::lookup_result Result 1284 = ClassDecl->lookup(MemberOrBase); 1285 if (Result.first != Result.second) { 1286 Member = dyn_cast<FieldDecl>(*Result.first); 1287 1288 if (Member) { 1289 if (EllipsisLoc.isValid()) 1290 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1291 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1292 1293 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1294 LParenLoc, RParenLoc); 1295 } 1296 1297 // Handle anonymous union case. 1298 if (IndirectFieldDecl* IndirectField 1299 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1300 if (EllipsisLoc.isValid()) 1301 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1302 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1303 1304 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1305 NumArgs, IdLoc, 1306 LParenLoc, RParenLoc); 1307 } 1308 } 1309 } 1310 // It didn't name a member, so see if it names a class. 1311 QualType BaseType; 1312 TypeSourceInfo *TInfo = 0; 1313 1314 if (TemplateTypeTy) { 1315 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1316 } else { 1317 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1318 LookupParsedName(R, S, &SS); 1319 1320 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1321 if (!TyD) { 1322 if (R.isAmbiguous()) return true; 1323 1324 // We don't want access-control diagnostics here. 1325 R.suppressDiagnostics(); 1326 1327 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1328 bool NotUnknownSpecialization = false; 1329 DeclContext *DC = computeDeclContext(SS, false); 1330 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1331 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1332 1333 if (!NotUnknownSpecialization) { 1334 // When the scope specifier can refer to a member of an unknown 1335 // specialization, we take it as a type name. 1336 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1337 SS.getWithLocInContext(Context), 1338 *MemberOrBase, IdLoc); 1339 if (BaseType.isNull()) 1340 return true; 1341 1342 R.clear(); 1343 R.setLookupName(MemberOrBase); 1344 } 1345 } 1346 1347 // If no results were found, try to correct typos. 1348 if (R.empty() && BaseType.isNull() && 1349 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1350 R.isSingleResult()) { 1351 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1352 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1353 // We have found a non-static data member with a similar 1354 // name to what was typed; complain and initialize that 1355 // member. 1356 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1357 << MemberOrBase << true << R.getLookupName() 1358 << FixItHint::CreateReplacement(R.getNameLoc(), 1359 R.getLookupName().getAsString()); 1360 Diag(Member->getLocation(), diag::note_previous_decl) 1361 << Member->getDeclName(); 1362 1363 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1364 LParenLoc, RParenLoc); 1365 } 1366 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1367 const CXXBaseSpecifier *DirectBaseSpec; 1368 const CXXBaseSpecifier *VirtualBaseSpec; 1369 if (FindBaseInitializer(*this, ClassDecl, 1370 Context.getTypeDeclType(Type), 1371 DirectBaseSpec, VirtualBaseSpec)) { 1372 // We have found a direct or virtual base class with a 1373 // similar name to what was typed; complain and initialize 1374 // that base class. 1375 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1376 << MemberOrBase << false << R.getLookupName() 1377 << FixItHint::CreateReplacement(R.getNameLoc(), 1378 R.getLookupName().getAsString()); 1379 1380 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1381 : VirtualBaseSpec; 1382 Diag(BaseSpec->getSourceRange().getBegin(), 1383 diag::note_base_class_specified_here) 1384 << BaseSpec->getType() 1385 << BaseSpec->getSourceRange(); 1386 1387 TyD = Type; 1388 } 1389 } 1390 } 1391 1392 if (!TyD && BaseType.isNull()) { 1393 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1394 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1395 return true; 1396 } 1397 } 1398 1399 if (BaseType.isNull()) { 1400 BaseType = Context.getTypeDeclType(TyD); 1401 if (SS.isSet()) { 1402 NestedNameSpecifier *Qualifier = 1403 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1404 1405 // FIXME: preserve source range information 1406 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1407 } 1408 } 1409 } 1410 1411 if (!TInfo) 1412 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1413 1414 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1415 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1416} 1417 1418/// Checks an initializer expression for use of uninitialized fields, such as 1419/// containing the field that is being initialized. Returns true if there is an 1420/// uninitialized field was used an updates the SourceLocation parameter; false 1421/// otherwise. 1422static bool InitExprContainsUninitializedFields(const Stmt *S, 1423 const ValueDecl *LhsField, 1424 SourceLocation *L) { 1425 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1426 1427 if (isa<CallExpr>(S)) { 1428 // Do not descend into function calls or constructors, as the use 1429 // of an uninitialized field may be valid. One would have to inspect 1430 // the contents of the function/ctor to determine if it is safe or not. 1431 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1432 // may be safe, depending on what the function/ctor does. 1433 return false; 1434 } 1435 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1436 const NamedDecl *RhsField = ME->getMemberDecl(); 1437 1438 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1439 // The member expression points to a static data member. 1440 assert(VD->isStaticDataMember() && 1441 "Member points to non-static data member!"); 1442 (void)VD; 1443 return false; 1444 } 1445 1446 if (isa<EnumConstantDecl>(RhsField)) { 1447 // The member expression points to an enum. 1448 return false; 1449 } 1450 1451 if (RhsField == LhsField) { 1452 // Initializing a field with itself. Throw a warning. 1453 // But wait; there are exceptions! 1454 // Exception #1: The field may not belong to this record. 1455 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1456 const Expr *base = ME->getBase(); 1457 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1458 // Even though the field matches, it does not belong to this record. 1459 return false; 1460 } 1461 // None of the exceptions triggered; return true to indicate an 1462 // uninitialized field was used. 1463 *L = ME->getMemberLoc(); 1464 return true; 1465 } 1466 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1467 // sizeof/alignof doesn't reference contents, do not warn. 1468 return false; 1469 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1470 // address-of doesn't reference contents (the pointer may be dereferenced 1471 // in the same expression but it would be rare; and weird). 1472 if (UOE->getOpcode() == UO_AddrOf) 1473 return false; 1474 } 1475 for (Stmt::const_child_range it = S->children(); it; ++it) { 1476 if (!*it) { 1477 // An expression such as 'member(arg ?: "")' may trigger this. 1478 continue; 1479 } 1480 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1481 return true; 1482 } 1483 return false; 1484} 1485 1486MemInitResult 1487Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1488 unsigned NumArgs, SourceLocation IdLoc, 1489 SourceLocation LParenLoc, 1490 SourceLocation RParenLoc) { 1491 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1492 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1493 assert((DirectMember || IndirectMember) && 1494 "Member must be a FieldDecl or IndirectFieldDecl"); 1495 1496 if (Member->isInvalidDecl()) 1497 return true; 1498 1499 // Diagnose value-uses of fields to initialize themselves, e.g. 1500 // foo(foo) 1501 // where foo is not also a parameter to the constructor. 1502 // TODO: implement -Wuninitialized and fold this into that framework. 1503 for (unsigned i = 0; i < NumArgs; ++i) { 1504 SourceLocation L; 1505 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1506 // FIXME: Return true in the case when other fields are used before being 1507 // uninitialized. For example, let this field be the i'th field. When 1508 // initializing the i'th field, throw a warning if any of the >= i'th 1509 // fields are used, as they are not yet initialized. 1510 // Right now we are only handling the case where the i'th field uses 1511 // itself in its initializer. 1512 Diag(L, diag::warn_field_is_uninit); 1513 } 1514 } 1515 1516 bool HasDependentArg = false; 1517 for (unsigned i = 0; i < NumArgs; i++) 1518 HasDependentArg |= Args[i]->isTypeDependent(); 1519 1520 Expr *Init; 1521 if (Member->getType()->isDependentType() || HasDependentArg) { 1522 // Can't check initialization for a member of dependent type or when 1523 // any of the arguments are type-dependent expressions. 1524 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1525 RParenLoc); 1526 1527 // Erase any temporaries within this evaluation context; we're not 1528 // going to track them in the AST, since we'll be rebuilding the 1529 // ASTs during template instantiation. 1530 ExprTemporaries.erase( 1531 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1532 ExprTemporaries.end()); 1533 } else { 1534 // Initialize the member. 1535 InitializedEntity MemberEntity = 1536 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1537 : InitializedEntity::InitializeMember(IndirectMember, 0); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1542 1543 ExprResult MemberInit = 1544 InitSeq.Perform(*this, MemberEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (MemberInit.isInvalid()) 1547 return true; 1548 1549 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1550 1551 // C++0x [class.base.init]p7: 1552 // The initialization of each base and member constitutes a 1553 // full-expression. 1554 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 // If we are in a dependent context, template instantiation will 1559 // perform this type-checking again. Just save the arguments that we 1560 // received in a ParenListExpr. 1561 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1562 // of the information that we have about the member 1563 // initializer. However, deconstructing the ASTs is a dicey process, 1564 // and this approach is far more likely to get the corner cases right. 1565 if (CurContext->isDependentContext()) 1566 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1567 RParenLoc); 1568 else 1569 Init = MemberInit.get(); 1570 } 1571 1572 if (DirectMember) { 1573 return new (Context) CXXCtorInitializer(Context, DirectMember, 1574 IdLoc, LParenLoc, Init, 1575 RParenLoc); 1576 } else { 1577 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1578 IdLoc, LParenLoc, Init, 1579 RParenLoc); 1580 } 1581} 1582 1583MemInitResult 1584Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation NameLoc, 1587 SourceLocation LParenLoc, 1588 SourceLocation RParenLoc, 1589 CXXRecordDecl *ClassDecl) { 1590 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1591 if (!LangOpts.CPlusPlus0x) 1592 return Diag(Loc, diag::err_delegation_0x_only) 1593 << TInfo->getTypeLoc().getLocalSourceRange(); 1594 1595 // Initialize the object. 1596 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1597 QualType(ClassDecl->getTypeForDecl(), 0)); 1598 InitializationKind Kind = 1599 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1600 1601 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1602 1603 ExprResult DelegationInit = 1604 InitSeq.Perform(*this, DelegationEntity, Kind, 1605 MultiExprArg(*this, Args, NumArgs), 0); 1606 if (DelegationInit.isInvalid()) 1607 return true; 1608 1609 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1610 CXXConstructorDecl *Constructor 1611 = ConExpr->getConstructor(); 1612 assert(Constructor && "Delegating constructor with no target?"); 1613 1614 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1615 1616 // C++0x [class.base.init]p7: 1617 // The initialization of each base and member constitutes a 1618 // full-expression. 1619 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1620 if (DelegationInit.isInvalid()) 1621 return true; 1622 1623 // If we are in a dependent context, template instantiation will 1624 // perform this type-checking again. Just save the arguments that we 1625 // received in a ParenListExpr. 1626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1627 // of the information that we have about the base 1628 // initializer. However, deconstructing the ASTs is a dicey process, 1629 // and this approach is far more likely to get the corner cases right. 1630 if (CurContext->isDependentContext()) { 1631 ExprResult Init 1632 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1633 NumArgs, RParenLoc)); 1634 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1635 Constructor, Init.takeAs<Expr>(), 1636 RParenLoc); 1637 } 1638 1639 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1640 DelegationInit.takeAs<Expr>(), 1641 RParenLoc); 1642} 1643 1644MemInitResult 1645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1646 Expr **Args, unsigned NumArgs, 1647 SourceLocation LParenLoc, SourceLocation RParenLoc, 1648 CXXRecordDecl *ClassDecl, 1649 SourceLocation EllipsisLoc) { 1650 bool HasDependentArg = false; 1651 for (unsigned i = 0; i < NumArgs; i++) 1652 HasDependentArg |= Args[i]->isTypeDependent(); 1653 1654 SourceLocation BaseLoc 1655 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1656 1657 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1658 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1659 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1660 1661 // C++ [class.base.init]p2: 1662 // [...] Unless the mem-initializer-id names a nonstatic data 1663 // member of the constructor's class or a direct or virtual base 1664 // of that class, the mem-initializer is ill-formed. A 1665 // mem-initializer-list can initialize a base class using any 1666 // name that denotes that base class type. 1667 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1668 1669 if (EllipsisLoc.isValid()) { 1670 // This is a pack expansion. 1671 if (!BaseType->containsUnexpandedParameterPack()) { 1672 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1673 << SourceRange(BaseLoc, RParenLoc); 1674 1675 EllipsisLoc = SourceLocation(); 1676 } 1677 } else { 1678 // Check for any unexpanded parameter packs. 1679 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1680 return true; 1681 1682 for (unsigned I = 0; I != NumArgs; ++I) 1683 if (DiagnoseUnexpandedParameterPack(Args[I])) 1684 return true; 1685 } 1686 1687 // Check for direct and virtual base classes. 1688 const CXXBaseSpecifier *DirectBaseSpec = 0; 1689 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1690 if (!Dependent) { 1691 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1692 BaseType)) 1693 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1694 LParenLoc, RParenLoc, ClassDecl); 1695 1696 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1697 VirtualBaseSpec); 1698 1699 // C++ [base.class.init]p2: 1700 // Unless the mem-initializer-id names a nonstatic data member of the 1701 // constructor's class or a direct or virtual base of that class, the 1702 // mem-initializer is ill-formed. 1703 if (!DirectBaseSpec && !VirtualBaseSpec) { 1704 // If the class has any dependent bases, then it's possible that 1705 // one of those types will resolve to the same type as 1706 // BaseType. Therefore, just treat this as a dependent base 1707 // class initialization. FIXME: Should we try to check the 1708 // initialization anyway? It seems odd. 1709 if (ClassDecl->hasAnyDependentBases()) 1710 Dependent = true; 1711 else 1712 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1713 << BaseType << Context.getTypeDeclType(ClassDecl) 1714 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1715 } 1716 } 1717 1718 if (Dependent) { 1719 // Can't check initialization for a base of dependent type or when 1720 // any of the arguments are type-dependent expressions. 1721 ExprResult BaseInit 1722 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1723 RParenLoc)); 1724 1725 // Erase any temporaries within this evaluation context; we're not 1726 // going to track them in the AST, since we'll be rebuilding the 1727 // ASTs during template instantiation. 1728 ExprTemporaries.erase( 1729 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1730 ExprTemporaries.end()); 1731 1732 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1733 /*IsVirtual=*/false, 1734 LParenLoc, 1735 BaseInit.takeAs<Expr>(), 1736 RParenLoc, 1737 EllipsisLoc); 1738 } 1739 1740 // C++ [base.class.init]p2: 1741 // If a mem-initializer-id is ambiguous because it designates both 1742 // a direct non-virtual base class and an inherited virtual base 1743 // class, the mem-initializer is ill-formed. 1744 if (DirectBaseSpec && VirtualBaseSpec) 1745 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1746 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1747 1748 CXXBaseSpecifier *BaseSpec 1749 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1750 if (!BaseSpec) 1751 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1752 1753 // Initialize the base. 1754 InitializedEntity BaseEntity = 1755 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1756 InitializationKind Kind = 1757 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1758 1759 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1760 1761 ExprResult BaseInit = 1762 InitSeq.Perform(*this, BaseEntity, Kind, 1763 MultiExprArg(*this, Args, NumArgs), 0); 1764 if (BaseInit.isInvalid()) 1765 return true; 1766 1767 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1768 1769 // C++0x [class.base.init]p7: 1770 // The initialization of each base and member constitutes a 1771 // full-expression. 1772 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 // If we are in a dependent context, template instantiation will 1777 // perform this type-checking again. Just save the arguments that we 1778 // received in a ParenListExpr. 1779 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1780 // of the information that we have about the base 1781 // initializer. However, deconstructing the ASTs is a dicey process, 1782 // and this approach is far more likely to get the corner cases right. 1783 if (CurContext->isDependentContext()) { 1784 ExprResult Init 1785 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1786 RParenLoc)); 1787 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1788 BaseSpec->isVirtual(), 1789 LParenLoc, 1790 Init.takeAs<Expr>(), 1791 RParenLoc, 1792 EllipsisLoc); 1793 } 1794 1795 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1796 BaseSpec->isVirtual(), 1797 LParenLoc, 1798 BaseInit.takeAs<Expr>(), 1799 RParenLoc, 1800 EllipsisLoc); 1801} 1802 1803/// ImplicitInitializerKind - How an implicit base or member initializer should 1804/// initialize its base or member. 1805enum ImplicitInitializerKind { 1806 IIK_Default, 1807 IIK_Copy, 1808 IIK_Move 1809}; 1810 1811static bool 1812BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1813 ImplicitInitializerKind ImplicitInitKind, 1814 CXXBaseSpecifier *BaseSpec, 1815 bool IsInheritedVirtualBase, 1816 CXXCtorInitializer *&CXXBaseInit) { 1817 InitializedEntity InitEntity 1818 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1819 IsInheritedVirtualBase); 1820 1821 ExprResult BaseInit; 1822 1823 switch (ImplicitInitKind) { 1824 case IIK_Default: { 1825 InitializationKind InitKind 1826 = InitializationKind::CreateDefault(Constructor->getLocation()); 1827 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1828 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1829 MultiExprArg(SemaRef, 0, 0)); 1830 break; 1831 } 1832 1833 case IIK_Copy: { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *CopyCtorArg = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Constructor->getLocation(), ParamType, 1840 VK_LValue, 0); 1841 1842 // Cast to the base class to avoid ambiguities. 1843 QualType ArgTy = 1844 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1845 ParamType.getQualifiers()); 1846 1847 CXXCastPath BasePath; 1848 BasePath.push_back(BaseSpec); 1849 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1850 CK_UncheckedDerivedToBase, 1851 VK_LValue, &BasePath).take(); 1852 1853 InitializationKind InitKind 1854 = InitializationKind::CreateDirect(Constructor->getLocation(), 1855 SourceLocation(), SourceLocation()); 1856 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1857 &CopyCtorArg, 1); 1858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1859 MultiExprArg(&CopyCtorArg, 1)); 1860 break; 1861 } 1862 1863 case IIK_Move: 1864 assert(false && "Unhandled initializer kind!"); 1865 } 1866 1867 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 CXXBaseInit = 1872 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1873 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1874 SourceLocation()), 1875 BaseSpec->isVirtual(), 1876 SourceLocation(), 1877 BaseInit.takeAs<Expr>(), 1878 SourceLocation(), 1879 SourceLocation()); 1880 1881 return false; 1882} 1883 1884static bool 1885BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 FieldDecl *Field, 1888 CXXCtorInitializer *&CXXMemberInit) { 1889 if (Field->isInvalidDecl()) 1890 return true; 1891 1892 SourceLocation Loc = Constructor->getLocation(); 1893 1894 if (ImplicitInitKind == IIK_Copy) { 1895 ParmVarDecl *Param = Constructor->getParamDecl(0); 1896 QualType ParamType = Param->getType().getNonReferenceType(); 1897 1898 Expr *MemberExprBase = 1899 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1900 Loc, ParamType, VK_LValue, 0); 1901 1902 // Build a reference to this field within the parameter. 1903 CXXScopeSpec SS; 1904 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1905 Sema::LookupMemberName); 1906 MemberLookup.addDecl(Field, AS_public); 1907 MemberLookup.resolveKind(); 1908 ExprResult CopyCtorArg 1909 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1910 ParamType, Loc, 1911 /*IsArrow=*/false, 1912 SS, 1913 /*FirstQualifierInScope=*/0, 1914 MemberLookup, 1915 /*TemplateArgs=*/0); 1916 if (CopyCtorArg.isInvalid()) 1917 return true; 1918 1919 // When the field we are copying is an array, create index variables for 1920 // each dimension of the array. We use these index variables to subscript 1921 // the source array, and other clients (e.g., CodeGen) will perform the 1922 // necessary iteration with these index variables. 1923 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1924 QualType BaseType = Field->getType(); 1925 QualType SizeType = SemaRef.Context.getSizeType(); 1926 while (const ConstantArrayType *Array 1927 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1928 // Create the iteration variable for this array index. 1929 IdentifierInfo *IterationVarName = 0; 1930 { 1931 llvm::SmallString<8> Str; 1932 llvm::raw_svector_ostream OS(Str); 1933 OS << "__i" << IndexVariables.size(); 1934 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1935 } 1936 VarDecl *IterationVar 1937 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1938 IterationVarName, SizeType, 1939 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1940 SC_None, SC_None); 1941 IndexVariables.push_back(IterationVar); 1942 1943 // Create a reference to the iteration variable. 1944 ExprResult IterationVarRef 1945 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1946 assert(!IterationVarRef.isInvalid() && 1947 "Reference to invented variable cannot fail!"); 1948 1949 // Subscript the array with this iteration variable. 1950 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1951 Loc, 1952 IterationVarRef.take(), 1953 Loc); 1954 if (CopyCtorArg.isInvalid()) 1955 return true; 1956 1957 BaseType = Array->getElementType(); 1958 } 1959 1960 // Construct the entity that we will be initializing. For an array, this 1961 // will be first element in the array, which may require several levels 1962 // of array-subscript entities. 1963 llvm::SmallVector<InitializedEntity, 4> Entities; 1964 Entities.reserve(1 + IndexVariables.size()); 1965 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1966 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1967 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1968 0, 1969 Entities.back())); 1970 1971 // Direct-initialize to use the copy constructor. 1972 InitializationKind InitKind = 1973 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1974 1975 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1976 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1977 &CopyCtorArgE, 1); 1978 1979 ExprResult MemberInit 1980 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1981 MultiExprArg(&CopyCtorArgE, 1)); 1982 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1983 if (MemberInit.isInvalid()) 1984 return true; 1985 1986 CXXMemberInit 1987 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1988 MemberInit.takeAs<Expr>(), Loc, 1989 IndexVariables.data(), 1990 IndexVariables.size()); 1991 return false; 1992 } 1993 1994 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1995 1996 QualType FieldBaseElementType = 1997 SemaRef.Context.getBaseElementType(Field->getType()); 1998 1999 if (FieldBaseElementType->isRecordType()) { 2000 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2001 InitializationKind InitKind = 2002 InitializationKind::CreateDefault(Loc); 2003 2004 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2005 ExprResult MemberInit = 2006 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2007 2008 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2009 if (MemberInit.isInvalid()) 2010 return true; 2011 2012 CXXMemberInit = 2013 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2014 Field, Loc, Loc, 2015 MemberInit.get(), 2016 Loc); 2017 return false; 2018 } 2019 2020 if (!Field->getParent()->isUnion()) { 2021 if (FieldBaseElementType->isReferenceType()) { 2022 SemaRef.Diag(Constructor->getLocation(), 2023 diag::err_uninitialized_member_in_ctor) 2024 << (int)Constructor->isImplicit() 2025 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2026 << 0 << Field->getDeclName(); 2027 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2028 return true; 2029 } 2030 2031 if (FieldBaseElementType.isConstQualified()) { 2032 SemaRef.Diag(Constructor->getLocation(), 2033 diag::err_uninitialized_member_in_ctor) 2034 << (int)Constructor->isImplicit() 2035 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2036 << 1 << Field->getDeclName(); 2037 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2038 return true; 2039 } 2040 } 2041 2042 // Nothing to initialize. 2043 CXXMemberInit = 0; 2044 return false; 2045} 2046 2047namespace { 2048struct BaseAndFieldInfo { 2049 Sema &S; 2050 CXXConstructorDecl *Ctor; 2051 bool AnyErrorsInInits; 2052 ImplicitInitializerKind IIK; 2053 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2054 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2055 2056 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2057 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2058 // FIXME: Handle implicit move constructors. 2059 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2060 IIK = IIK_Copy; 2061 else 2062 IIK = IIK_Default; 2063 } 2064}; 2065} 2066 2067static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2068 FieldDecl *Top, FieldDecl *Field) { 2069 2070 // Overwhelmingly common case: we have a direct initializer for this field. 2071 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2072 Info.AllToInit.push_back(Init); 2073 return false; 2074 } 2075 2076 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2077 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2078 assert(FieldClassType && "anonymous struct/union without record type"); 2079 CXXRecordDecl *FieldClassDecl 2080 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2081 2082 // Even though union members never have non-trivial default 2083 // constructions in C++03, we still build member initializers for aggregate 2084 // record types which can be union members, and C++0x allows non-trivial 2085 // default constructors for union members, so we ensure that only one 2086 // member is initialized for these. 2087 if (FieldClassDecl->isUnion()) { 2088 // First check for an explicit initializer for one field. 2089 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2090 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2091 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2092 Info.AllToInit.push_back(Init); 2093 2094 // Once we've initialized a field of an anonymous union, the union 2095 // field in the class is also initialized, so exit immediately. 2096 return false; 2097 } else if ((*FA)->isAnonymousStructOrUnion()) { 2098 if (CollectFieldInitializer(Info, Top, *FA)) 2099 return true; 2100 } 2101 } 2102 2103 // Fallthrough and construct a default initializer for the union as 2104 // a whole, which can call its default constructor if such a thing exists 2105 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2106 // behavior going forward with C++0x, when anonymous unions there are 2107 // finalized, we should revisit this. 2108 } else { 2109 // For structs, we simply descend through to initialize all members where 2110 // necessary. 2111 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2112 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2113 if (CollectFieldInitializer(Info, Top, *FA)) 2114 return true; 2115 } 2116 } 2117 } 2118 2119 // Don't try to build an implicit initializer if there were semantic 2120 // errors in any of the initializers (and therefore we might be 2121 // missing some that the user actually wrote). 2122 if (Info.AnyErrorsInInits) 2123 return false; 2124 2125 CXXCtorInitializer *Init = 0; 2126 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2127 return true; 2128 2129 if (Init) 2130 Info.AllToInit.push_back(Init); 2131 2132 return false; 2133} 2134 2135bool 2136Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2137 CXXCtorInitializer *Initializer) { 2138 assert(Initializer->isDelegatingInitializer()); 2139 Constructor->setNumCtorInitializers(1); 2140 CXXCtorInitializer **initializer = 2141 new (Context) CXXCtorInitializer*[1]; 2142 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2143 Constructor->setCtorInitializers(initializer); 2144 2145 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2146 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2147 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2148 } 2149 2150 DelegatingCtorDecls.push_back(Constructor); 2151 2152 return false; 2153} 2154 2155bool 2156Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2157 CXXCtorInitializer **Initializers, 2158 unsigned NumInitializers, 2159 bool AnyErrors) { 2160 if (Constructor->getDeclContext()->isDependentContext()) { 2161 // Just store the initializers as written, they will be checked during 2162 // instantiation. 2163 if (NumInitializers > 0) { 2164 Constructor->setNumCtorInitializers(NumInitializers); 2165 CXXCtorInitializer **baseOrMemberInitializers = 2166 new (Context) CXXCtorInitializer*[NumInitializers]; 2167 memcpy(baseOrMemberInitializers, Initializers, 2168 NumInitializers * sizeof(CXXCtorInitializer*)); 2169 Constructor->setCtorInitializers(baseOrMemberInitializers); 2170 } 2171 2172 return false; 2173 } 2174 2175 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2176 2177 // We need to build the initializer AST according to order of construction 2178 // and not what user specified in the Initializers list. 2179 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2180 if (!ClassDecl) 2181 return true; 2182 2183 bool HadError = false; 2184 2185 for (unsigned i = 0; i < NumInitializers; i++) { 2186 CXXCtorInitializer *Member = Initializers[i]; 2187 2188 if (Member->isBaseInitializer()) 2189 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2190 else 2191 Info.AllBaseFields[Member->getAnyMember()] = Member; 2192 } 2193 2194 // Keep track of the direct virtual bases. 2195 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2196 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2197 E = ClassDecl->bases_end(); I != E; ++I) { 2198 if (I->isVirtual()) 2199 DirectVBases.insert(I); 2200 } 2201 2202 // Push virtual bases before others. 2203 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2204 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2205 2206 if (CXXCtorInitializer *Value 2207 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2208 Info.AllToInit.push_back(Value); 2209 } else if (!AnyErrors) { 2210 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2211 CXXCtorInitializer *CXXBaseInit; 2212 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2213 VBase, IsInheritedVirtualBase, 2214 CXXBaseInit)) { 2215 HadError = true; 2216 continue; 2217 } 2218 2219 Info.AllToInit.push_back(CXXBaseInit); 2220 } 2221 } 2222 2223 // Non-virtual bases. 2224 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2225 E = ClassDecl->bases_end(); Base != E; ++Base) { 2226 // Virtuals are in the virtual base list and already constructed. 2227 if (Base->isVirtual()) 2228 continue; 2229 2230 if (CXXCtorInitializer *Value 2231 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2232 Info.AllToInit.push_back(Value); 2233 } else if (!AnyErrors) { 2234 CXXCtorInitializer *CXXBaseInit; 2235 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2236 Base, /*IsInheritedVirtualBase=*/false, 2237 CXXBaseInit)) { 2238 HadError = true; 2239 continue; 2240 } 2241 2242 Info.AllToInit.push_back(CXXBaseInit); 2243 } 2244 } 2245 2246 // Fields. 2247 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2248 E = ClassDecl->field_end(); Field != E; ++Field) { 2249 if ((*Field)->getType()->isIncompleteArrayType()) { 2250 assert(ClassDecl->hasFlexibleArrayMember() && 2251 "Incomplete array type is not valid"); 2252 continue; 2253 } 2254 if (CollectFieldInitializer(Info, *Field, *Field)) 2255 HadError = true; 2256 } 2257 2258 NumInitializers = Info.AllToInit.size(); 2259 if (NumInitializers > 0) { 2260 Constructor->setNumCtorInitializers(NumInitializers); 2261 CXXCtorInitializer **baseOrMemberInitializers = 2262 new (Context) CXXCtorInitializer*[NumInitializers]; 2263 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2264 NumInitializers * sizeof(CXXCtorInitializer*)); 2265 Constructor->setCtorInitializers(baseOrMemberInitializers); 2266 2267 // Constructors implicitly reference the base and member 2268 // destructors. 2269 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2270 Constructor->getParent()); 2271 } 2272 2273 return HadError; 2274} 2275 2276static void *GetKeyForTopLevelField(FieldDecl *Field) { 2277 // For anonymous unions, use the class declaration as the key. 2278 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2279 if (RT->getDecl()->isAnonymousStructOrUnion()) 2280 return static_cast<void *>(RT->getDecl()); 2281 } 2282 return static_cast<void *>(Field); 2283} 2284 2285static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2286 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2287} 2288 2289static void *GetKeyForMember(ASTContext &Context, 2290 CXXCtorInitializer *Member) { 2291 if (!Member->isAnyMemberInitializer()) 2292 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2293 2294 // For fields injected into the class via declaration of an anonymous union, 2295 // use its anonymous union class declaration as the unique key. 2296 FieldDecl *Field = Member->getAnyMember(); 2297 2298 // If the field is a member of an anonymous struct or union, our key 2299 // is the anonymous record decl that's a direct child of the class. 2300 RecordDecl *RD = Field->getParent(); 2301 if (RD->isAnonymousStructOrUnion()) { 2302 while (true) { 2303 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2304 if (Parent->isAnonymousStructOrUnion()) 2305 RD = Parent; 2306 else 2307 break; 2308 } 2309 2310 return static_cast<void *>(RD); 2311 } 2312 2313 return static_cast<void *>(Field); 2314} 2315 2316static void 2317DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2318 const CXXConstructorDecl *Constructor, 2319 CXXCtorInitializer **Inits, 2320 unsigned NumInits) { 2321 if (Constructor->getDeclContext()->isDependentContext()) 2322 return; 2323 2324 // Don't check initializers order unless the warning is enabled at the 2325 // location of at least one initializer. 2326 bool ShouldCheckOrder = false; 2327 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2328 CXXCtorInitializer *Init = Inits[InitIndex]; 2329 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2330 Init->getSourceLocation()) 2331 != Diagnostic::Ignored) { 2332 ShouldCheckOrder = true; 2333 break; 2334 } 2335 } 2336 if (!ShouldCheckOrder) 2337 return; 2338 2339 // Build the list of bases and members in the order that they'll 2340 // actually be initialized. The explicit initializers should be in 2341 // this same order but may be missing things. 2342 llvm::SmallVector<const void*, 32> IdealInitKeys; 2343 2344 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2345 2346 // 1. Virtual bases. 2347 for (CXXRecordDecl::base_class_const_iterator VBase = 2348 ClassDecl->vbases_begin(), 2349 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2350 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2351 2352 // 2. Non-virtual bases. 2353 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2354 E = ClassDecl->bases_end(); Base != E; ++Base) { 2355 if (Base->isVirtual()) 2356 continue; 2357 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2358 } 2359 2360 // 3. Direct fields. 2361 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2362 E = ClassDecl->field_end(); Field != E; ++Field) 2363 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2364 2365 unsigned NumIdealInits = IdealInitKeys.size(); 2366 unsigned IdealIndex = 0; 2367 2368 CXXCtorInitializer *PrevInit = 0; 2369 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2370 CXXCtorInitializer *Init = Inits[InitIndex]; 2371 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2372 2373 // Scan forward to try to find this initializer in the idealized 2374 // initializers list. 2375 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2376 if (InitKey == IdealInitKeys[IdealIndex]) 2377 break; 2378 2379 // If we didn't find this initializer, it must be because we 2380 // scanned past it on a previous iteration. That can only 2381 // happen if we're out of order; emit a warning. 2382 if (IdealIndex == NumIdealInits && PrevInit) { 2383 Sema::SemaDiagnosticBuilder D = 2384 SemaRef.Diag(PrevInit->getSourceLocation(), 2385 diag::warn_initializer_out_of_order); 2386 2387 if (PrevInit->isAnyMemberInitializer()) 2388 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2389 else 2390 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2391 2392 if (Init->isAnyMemberInitializer()) 2393 D << 0 << Init->getAnyMember()->getDeclName(); 2394 else 2395 D << 1 << Init->getBaseClassInfo()->getType(); 2396 2397 // Move back to the initializer's location in the ideal list. 2398 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2399 if (InitKey == IdealInitKeys[IdealIndex]) 2400 break; 2401 2402 assert(IdealIndex != NumIdealInits && 2403 "initializer not found in initializer list"); 2404 } 2405 2406 PrevInit = Init; 2407 } 2408} 2409 2410namespace { 2411bool CheckRedundantInit(Sema &S, 2412 CXXCtorInitializer *Init, 2413 CXXCtorInitializer *&PrevInit) { 2414 if (!PrevInit) { 2415 PrevInit = Init; 2416 return false; 2417 } 2418 2419 if (FieldDecl *Field = Init->getMember()) 2420 S.Diag(Init->getSourceLocation(), 2421 diag::err_multiple_mem_initialization) 2422 << Field->getDeclName() 2423 << Init->getSourceRange(); 2424 else { 2425 const Type *BaseClass = Init->getBaseClass(); 2426 assert(BaseClass && "neither field nor base"); 2427 S.Diag(Init->getSourceLocation(), 2428 diag::err_multiple_base_initialization) 2429 << QualType(BaseClass, 0) 2430 << Init->getSourceRange(); 2431 } 2432 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2433 << 0 << PrevInit->getSourceRange(); 2434 2435 return true; 2436} 2437 2438typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2439typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2440 2441bool CheckRedundantUnionInit(Sema &S, 2442 CXXCtorInitializer *Init, 2443 RedundantUnionMap &Unions) { 2444 FieldDecl *Field = Init->getAnyMember(); 2445 RecordDecl *Parent = Field->getParent(); 2446 if (!Parent->isAnonymousStructOrUnion()) 2447 return false; 2448 2449 NamedDecl *Child = Field; 2450 do { 2451 if (Parent->isUnion()) { 2452 UnionEntry &En = Unions[Parent]; 2453 if (En.first && En.first != Child) { 2454 S.Diag(Init->getSourceLocation(), 2455 diag::err_multiple_mem_union_initialization) 2456 << Field->getDeclName() 2457 << Init->getSourceRange(); 2458 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2459 << 0 << En.second->getSourceRange(); 2460 return true; 2461 } else if (!En.first) { 2462 En.first = Child; 2463 En.second = Init; 2464 } 2465 } 2466 2467 Child = Parent; 2468 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2469 } while (Parent->isAnonymousStructOrUnion()); 2470 2471 return false; 2472} 2473} 2474 2475/// ActOnMemInitializers - Handle the member initializers for a constructor. 2476void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2477 SourceLocation ColonLoc, 2478 MemInitTy **meminits, unsigned NumMemInits, 2479 bool AnyErrors) { 2480 if (!ConstructorDecl) 2481 return; 2482 2483 AdjustDeclIfTemplate(ConstructorDecl); 2484 2485 CXXConstructorDecl *Constructor 2486 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2487 2488 if (!Constructor) { 2489 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2490 return; 2491 } 2492 2493 CXXCtorInitializer **MemInits = 2494 reinterpret_cast<CXXCtorInitializer **>(meminits); 2495 2496 // Mapping for the duplicate initializers check. 2497 // For member initializers, this is keyed with a FieldDecl*. 2498 // For base initializers, this is keyed with a Type*. 2499 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2500 2501 // Mapping for the inconsistent anonymous-union initializers check. 2502 RedundantUnionMap MemberUnions; 2503 2504 bool HadError = false; 2505 for (unsigned i = 0; i < NumMemInits; i++) { 2506 CXXCtorInitializer *Init = MemInits[i]; 2507 2508 // Set the source order index. 2509 Init->setSourceOrder(i); 2510 2511 if (Init->isAnyMemberInitializer()) { 2512 FieldDecl *Field = Init->getAnyMember(); 2513 if (CheckRedundantInit(*this, Init, Members[Field]) || 2514 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2515 HadError = true; 2516 } else if (Init->isBaseInitializer()) { 2517 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2518 if (CheckRedundantInit(*this, Init, Members[Key])) 2519 HadError = true; 2520 } else { 2521 assert(Init->isDelegatingInitializer()); 2522 // This must be the only initializer 2523 if (i != 0 || NumMemInits > 1) { 2524 Diag(MemInits[0]->getSourceLocation(), 2525 diag::err_delegating_initializer_alone) 2526 << MemInits[0]->getSourceRange(); 2527 HadError = true; 2528 // We will treat this as being the only initializer. 2529 } 2530 SetDelegatingInitializer(Constructor, MemInits[i]); 2531 // Return immediately as the initializer is set. 2532 return; 2533 } 2534 } 2535 2536 if (HadError) 2537 return; 2538 2539 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2540 2541 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2542} 2543 2544void 2545Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2546 CXXRecordDecl *ClassDecl) { 2547 // Ignore dependent contexts. 2548 if (ClassDecl->isDependentContext()) 2549 return; 2550 2551 // FIXME: all the access-control diagnostics are positioned on the 2552 // field/base declaration. That's probably good; that said, the 2553 // user might reasonably want to know why the destructor is being 2554 // emitted, and we currently don't say. 2555 2556 // Non-static data members. 2557 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2558 E = ClassDecl->field_end(); I != E; ++I) { 2559 FieldDecl *Field = *I; 2560 if (Field->isInvalidDecl()) 2561 continue; 2562 QualType FieldType = Context.getBaseElementType(Field->getType()); 2563 2564 const RecordType* RT = FieldType->getAs<RecordType>(); 2565 if (!RT) 2566 continue; 2567 2568 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2569 if (FieldClassDecl->isInvalidDecl()) 2570 continue; 2571 if (FieldClassDecl->hasTrivialDestructor()) 2572 continue; 2573 2574 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2575 assert(Dtor && "No dtor found for FieldClassDecl!"); 2576 CheckDestructorAccess(Field->getLocation(), Dtor, 2577 PDiag(diag::err_access_dtor_field) 2578 << Field->getDeclName() 2579 << FieldType); 2580 2581 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2582 } 2583 2584 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2585 2586 // Bases. 2587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2588 E = ClassDecl->bases_end(); Base != E; ++Base) { 2589 // Bases are always records in a well-formed non-dependent class. 2590 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2591 2592 // Remember direct virtual bases. 2593 if (Base->isVirtual()) 2594 DirectVirtualBases.insert(RT); 2595 2596 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2597 // If our base class is invalid, we probably can't get its dtor anyway. 2598 if (BaseClassDecl->isInvalidDecl()) 2599 continue; 2600 // Ignore trivial destructors. 2601 if (BaseClassDecl->hasTrivialDestructor()) 2602 continue; 2603 2604 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2605 assert(Dtor && "No dtor found for BaseClassDecl!"); 2606 2607 // FIXME: caret should be on the start of the class name 2608 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2609 PDiag(diag::err_access_dtor_base) 2610 << Base->getType() 2611 << Base->getSourceRange()); 2612 2613 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2614 } 2615 2616 // Virtual bases. 2617 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2618 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2619 2620 // Bases are always records in a well-formed non-dependent class. 2621 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2622 2623 // Ignore direct virtual bases. 2624 if (DirectVirtualBases.count(RT)) 2625 continue; 2626 2627 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2628 // If our base class is invalid, we probably can't get its dtor anyway. 2629 if (BaseClassDecl->isInvalidDecl()) 2630 continue; 2631 // Ignore trivial destructors. 2632 if (BaseClassDecl->hasTrivialDestructor()) 2633 continue; 2634 2635 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2636 assert(Dtor && "No dtor found for BaseClassDecl!"); 2637 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2638 PDiag(diag::err_access_dtor_vbase) 2639 << VBase->getType()); 2640 2641 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2642 } 2643} 2644 2645void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2646 if (!CDtorDecl) 2647 return; 2648 2649 if (CXXConstructorDecl *Constructor 2650 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2651 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2652} 2653 2654bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2655 unsigned DiagID, AbstractDiagSelID SelID) { 2656 if (SelID == -1) 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2658 else 2659 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2660} 2661 2662bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2663 const PartialDiagnostic &PD) { 2664 if (!getLangOptions().CPlusPlus) 2665 return false; 2666 2667 if (const ArrayType *AT = Context.getAsArrayType(T)) 2668 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2669 2670 if (const PointerType *PT = T->getAs<PointerType>()) { 2671 // Find the innermost pointer type. 2672 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2673 PT = T; 2674 2675 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2676 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2677 } 2678 2679 const RecordType *RT = T->getAs<RecordType>(); 2680 if (!RT) 2681 return false; 2682 2683 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2684 2685 // We can't answer whether something is abstract until it has a 2686 // definition. If it's currently being defined, we'll walk back 2687 // over all the declarations when we have a full definition. 2688 const CXXRecordDecl *Def = RD->getDefinition(); 2689 if (!Def || Def->isBeingDefined()) 2690 return false; 2691 2692 if (!RD->isAbstract()) 2693 return false; 2694 2695 Diag(Loc, PD) << RD->getDeclName(); 2696 DiagnoseAbstractType(RD); 2697 2698 return true; 2699} 2700 2701void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2702 // Check if we've already emitted the list of pure virtual functions 2703 // for this class. 2704 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2705 return; 2706 2707 CXXFinalOverriderMap FinalOverriders; 2708 RD->getFinalOverriders(FinalOverriders); 2709 2710 // Keep a set of seen pure methods so we won't diagnose the same method 2711 // more than once. 2712 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2713 2714 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2715 MEnd = FinalOverriders.end(); 2716 M != MEnd; 2717 ++M) { 2718 for (OverridingMethods::iterator SO = M->second.begin(), 2719 SOEnd = M->second.end(); 2720 SO != SOEnd; ++SO) { 2721 // C++ [class.abstract]p4: 2722 // A class is abstract if it contains or inherits at least one 2723 // pure virtual function for which the final overrider is pure 2724 // virtual. 2725 2726 // 2727 if (SO->second.size() != 1) 2728 continue; 2729 2730 if (!SO->second.front().Method->isPure()) 2731 continue; 2732 2733 if (!SeenPureMethods.insert(SO->second.front().Method)) 2734 continue; 2735 2736 Diag(SO->second.front().Method->getLocation(), 2737 diag::note_pure_virtual_function) 2738 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2739 } 2740 } 2741 2742 if (!PureVirtualClassDiagSet) 2743 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2744 PureVirtualClassDiagSet->insert(RD); 2745} 2746 2747namespace { 2748struct AbstractUsageInfo { 2749 Sema &S; 2750 CXXRecordDecl *Record; 2751 CanQualType AbstractType; 2752 bool Invalid; 2753 2754 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2755 : S(S), Record(Record), 2756 AbstractType(S.Context.getCanonicalType( 2757 S.Context.getTypeDeclType(Record))), 2758 Invalid(false) {} 2759 2760 void DiagnoseAbstractType() { 2761 if (Invalid) return; 2762 S.DiagnoseAbstractType(Record); 2763 Invalid = true; 2764 } 2765 2766 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2767}; 2768 2769struct CheckAbstractUsage { 2770 AbstractUsageInfo &Info; 2771 const NamedDecl *Ctx; 2772 2773 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2774 : Info(Info), Ctx(Ctx) {} 2775 2776 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2777 switch (TL.getTypeLocClass()) { 2778#define ABSTRACT_TYPELOC(CLASS, PARENT) 2779#define TYPELOC(CLASS, PARENT) \ 2780 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2781#include "clang/AST/TypeLocNodes.def" 2782 } 2783 } 2784 2785 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2786 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2787 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2788 if (!TL.getArg(I)) 2789 continue; 2790 2791 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2792 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2793 } 2794 } 2795 2796 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2797 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2798 } 2799 2800 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2801 // Visit the type parameters from a permissive context. 2802 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2803 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2804 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2805 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2806 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2807 // TODO: other template argument types? 2808 } 2809 } 2810 2811 // Visit pointee types from a permissive context. 2812#define CheckPolymorphic(Type) \ 2813 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2814 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2815 } 2816 CheckPolymorphic(PointerTypeLoc) 2817 CheckPolymorphic(ReferenceTypeLoc) 2818 CheckPolymorphic(MemberPointerTypeLoc) 2819 CheckPolymorphic(BlockPointerTypeLoc) 2820 2821 /// Handle all the types we haven't given a more specific 2822 /// implementation for above. 2823 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2824 // Every other kind of type that we haven't called out already 2825 // that has an inner type is either (1) sugar or (2) contains that 2826 // inner type in some way as a subobject. 2827 if (TypeLoc Next = TL.getNextTypeLoc()) 2828 return Visit(Next, Sel); 2829 2830 // If there's no inner type and we're in a permissive context, 2831 // don't diagnose. 2832 if (Sel == Sema::AbstractNone) return; 2833 2834 // Check whether the type matches the abstract type. 2835 QualType T = TL.getType(); 2836 if (T->isArrayType()) { 2837 Sel = Sema::AbstractArrayType; 2838 T = Info.S.Context.getBaseElementType(T); 2839 } 2840 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2841 if (CT != Info.AbstractType) return; 2842 2843 // It matched; do some magic. 2844 if (Sel == Sema::AbstractArrayType) { 2845 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2846 << T << TL.getSourceRange(); 2847 } else { 2848 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2849 << Sel << T << TL.getSourceRange(); 2850 } 2851 Info.DiagnoseAbstractType(); 2852 } 2853}; 2854 2855void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2856 Sema::AbstractDiagSelID Sel) { 2857 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2858} 2859 2860} 2861 2862/// Check for invalid uses of an abstract type in a method declaration. 2863static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2864 CXXMethodDecl *MD) { 2865 // No need to do the check on definitions, which require that 2866 // the return/param types be complete. 2867 if (MD->doesThisDeclarationHaveABody()) 2868 return; 2869 2870 // For safety's sake, just ignore it if we don't have type source 2871 // information. This should never happen for non-implicit methods, 2872 // but... 2873 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2874 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2875} 2876 2877/// Check for invalid uses of an abstract type within a class definition. 2878static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2879 CXXRecordDecl *RD) { 2880 for (CXXRecordDecl::decl_iterator 2881 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2882 Decl *D = *I; 2883 if (D->isImplicit()) continue; 2884 2885 // Methods and method templates. 2886 if (isa<CXXMethodDecl>(D)) { 2887 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2888 } else if (isa<FunctionTemplateDecl>(D)) { 2889 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2890 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2891 2892 // Fields and static variables. 2893 } else if (isa<FieldDecl>(D)) { 2894 FieldDecl *FD = cast<FieldDecl>(D); 2895 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2896 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2897 } else if (isa<VarDecl>(D)) { 2898 VarDecl *VD = cast<VarDecl>(D); 2899 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2900 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2901 2902 // Nested classes and class templates. 2903 } else if (isa<CXXRecordDecl>(D)) { 2904 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2905 } else if (isa<ClassTemplateDecl>(D)) { 2906 CheckAbstractClassUsage(Info, 2907 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2908 } 2909 } 2910} 2911 2912/// \brief Perform semantic checks on a class definition that has been 2913/// completing, introducing implicitly-declared members, checking for 2914/// abstract types, etc. 2915void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2916 if (!Record) 2917 return; 2918 2919 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2920 AbstractUsageInfo Info(*this, Record); 2921 CheckAbstractClassUsage(Info, Record); 2922 } 2923 2924 // If this is not an aggregate type and has no user-declared constructor, 2925 // complain about any non-static data members of reference or const scalar 2926 // type, since they will never get initializers. 2927 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2928 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2929 bool Complained = false; 2930 for (RecordDecl::field_iterator F = Record->field_begin(), 2931 FEnd = Record->field_end(); 2932 F != FEnd; ++F) { 2933 if (F->getType()->isReferenceType() || 2934 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2935 if (!Complained) { 2936 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2937 << Record->getTagKind() << Record; 2938 Complained = true; 2939 } 2940 2941 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2942 << F->getType()->isReferenceType() 2943 << F->getDeclName(); 2944 } 2945 } 2946 } 2947 2948 if (Record->isDynamicClass() && !Record->isDependentType()) 2949 DynamicClasses.push_back(Record); 2950 2951 if (Record->getIdentifier()) { 2952 // C++ [class.mem]p13: 2953 // If T is the name of a class, then each of the following shall have a 2954 // name different from T: 2955 // - every member of every anonymous union that is a member of class T. 2956 // 2957 // C++ [class.mem]p14: 2958 // In addition, if class T has a user-declared constructor (12.1), every 2959 // non-static data member of class T shall have a name different from T. 2960 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2961 R.first != R.second; ++R.first) { 2962 NamedDecl *D = *R.first; 2963 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2964 isa<IndirectFieldDecl>(D)) { 2965 Diag(D->getLocation(), diag::err_member_name_of_class) 2966 << D->getDeclName(); 2967 break; 2968 } 2969 } 2970 } 2971 2972 // Warn if the class has virtual methods but non-virtual public destructor. 2973 if (Record->isPolymorphic() && !Record->isDependentType()) { 2974 CXXDestructorDecl *dtor = Record->getDestructor(); 2975 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2976 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2977 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2978 } 2979 2980 // See if a method overloads virtual methods in a base 2981 /// class without overriding any. 2982 if (!Record->isDependentType()) { 2983 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2984 MEnd = Record->method_end(); 2985 M != MEnd; ++M) { 2986 if (!(*M)->isStatic()) 2987 DiagnoseHiddenVirtualMethods(Record, *M); 2988 } 2989 } 2990 2991 // Declare inherited constructors. We do this eagerly here because: 2992 // - The standard requires an eager diagnostic for conflicting inherited 2993 // constructors from different classes. 2994 // - The lazy declaration of the other implicit constructors is so as to not 2995 // waste space and performance on classes that are not meant to be 2996 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2997 // have inherited constructors. 2998 DeclareInheritedConstructors(Record); 2999 3000 if (!Record->isDependentType()) 3001 CheckExplicitlyDefaultedMethods(Record); 3002} 3003 3004void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3005 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3006 ME = Record->method_end(); 3007 MI != ME; ++MI) { 3008 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3009 switch (getSpecialMember(*MI)) { 3010 case CXXDefaultConstructor: 3011 CheckExplicitlyDefaultedDefaultConstructor( 3012 cast<CXXConstructorDecl>(*MI)); 3013 break; 3014 3015 case CXXDestructor: 3016 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3017 break; 3018 3019 case CXXCopyConstructor: 3020 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3021 break; 3022 3023 case CXXCopyAssignment: 3024 CheckExplicitlyDefaultedCopyAssignment(*MI); 3025 break; 3026 3027 default: 3028 // FIXME: Do moves once they exist 3029 llvm_unreachable("non-special member explicitly defaulted!"); 3030 } 3031 } 3032 } 3033 3034} 3035 3036void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3037 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3038 3039 // Whether this was the first-declared instance of the constructor. 3040 // This affects whether we implicitly add an exception spec (and, eventually, 3041 // constexpr). It is also ill-formed to explicitly default a constructor such 3042 // that it would be deleted. (C++0x [decl.fct.def.default]) 3043 bool First = CD == CD->getCanonicalDecl(); 3044 3045 bool HadError = false; 3046 if (CD->getNumParams() != 0) { 3047 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3048 << CD->getSourceRange(); 3049 HadError = true; 3050 } 3051 3052 ImplicitExceptionSpecification Spec 3053 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3054 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3055 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3056 *ExceptionType = Context.getFunctionType( 3057 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3058 3059 if (CtorType->hasExceptionSpec()) { 3060 if (CheckEquivalentExceptionSpec( 3061 PDiag(diag::err_incorrect_defaulted_exception_spec) 3062 << 0 /* default constructor */, 3063 PDiag(), 3064 ExceptionType, SourceLocation(), 3065 CtorType, CD->getLocation())) { 3066 HadError = true; 3067 } 3068 } else if (First) { 3069 // We set the declaration to have the computed exception spec here. 3070 // We know there are no parameters. 3071 EPI.ExtInfo = CtorType->getExtInfo(); 3072 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3073 } 3074 3075 if (HadError) { 3076 CD->setInvalidDecl(); 3077 return; 3078 } 3079 3080 if (ShouldDeleteDefaultConstructor(CD)) { 3081 if (First) { 3082 CD->setDeletedAsWritten(); 3083 } else { 3084 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3085 << 0 /* default constructor */; 3086 CD->setInvalidDecl(); 3087 } 3088 } 3089} 3090 3091void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3092 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3093 3094 // Whether this was the first-declared instance of the constructor. 3095 bool First = CD == CD->getCanonicalDecl(); 3096 3097 bool HadError = false; 3098 if (CD->getNumParams() != 1) { 3099 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3100 << CD->getSourceRange(); 3101 HadError = true; 3102 } 3103 3104 ImplicitExceptionSpecification Spec(Context); 3105 bool Const; 3106 llvm::tie(Spec, Const) = 3107 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3108 3109 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3110 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3111 *ExceptionType = Context.getFunctionType( 3112 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3113 3114 // Check for parameter type matching. 3115 // This is a copy ctor so we know it's a cv-qualified reference to T. 3116 QualType ArgType = CtorType->getArgType(0); 3117 if (ArgType->getPointeeType().isVolatileQualified()) { 3118 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3119 HadError = true; 3120 } 3121 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3122 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3123 HadError = true; 3124 } 3125 3126 if (CtorType->hasExceptionSpec()) { 3127 if (CheckEquivalentExceptionSpec( 3128 PDiag(diag::err_incorrect_defaulted_exception_spec) 3129 << 1 /* copy constructor */, 3130 PDiag(), 3131 ExceptionType, SourceLocation(), 3132 CtorType, CD->getLocation())) { 3133 HadError = true; 3134 } 3135 } else if (First) { 3136 // We set the declaration to have the computed exception spec here. 3137 // We duplicate the one parameter type. 3138 EPI.ExtInfo = CtorType->getExtInfo(); 3139 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3140 } 3141 3142 if (HadError) { 3143 CD->setInvalidDecl(); 3144 return; 3145 } 3146 3147 if (ShouldDeleteCopyConstructor(CD)) { 3148 if (First) { 3149 CD->setDeletedAsWritten(); 3150 } else { 3151 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3152 << 1 /* copy constructor */; 3153 CD->setInvalidDecl(); 3154 } 3155 } 3156} 3157 3158void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3159 assert(MD->isExplicitlyDefaulted()); 3160 3161 // Whether this was the first-declared instance of the operator 3162 bool First = MD == MD->getCanonicalDecl(); 3163 3164 bool HadError = false; 3165 if (MD->getNumParams() != 1) { 3166 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3167 << MD->getSourceRange(); 3168 HadError = true; 3169 } 3170 3171 QualType ReturnType = 3172 MD->getType()->getAs<FunctionType>()->getResultType(); 3173 if (!ReturnType->isLValueReferenceType() || 3174 !Context.hasSameType( 3175 Context.getCanonicalType(ReturnType->getPointeeType()), 3176 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3177 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3178 HadError = true; 3179 } 3180 3181 ImplicitExceptionSpecification Spec(Context); 3182 bool Const; 3183 llvm::tie(Spec, Const) = 3184 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3185 3186 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3187 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3188 *ExceptionType = Context.getFunctionType( 3189 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3190 3191 QualType ArgType = OperType->getArgType(0); 3192 if (!ArgType->isReferenceType()) { 3193 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3194 HadError = true; 3195 } else { 3196 if (ArgType->getPointeeType().isVolatileQualified()) { 3197 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3198 HadError = true; 3199 } 3200 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3201 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3202 HadError = true; 3203 } 3204 } 3205 3206 if (OperType->getTypeQuals()) { 3207 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3208 HadError = true; 3209 } 3210 3211 if (OperType->hasExceptionSpec()) { 3212 if (CheckEquivalentExceptionSpec( 3213 PDiag(diag::err_incorrect_defaulted_exception_spec) 3214 << 2 /* copy assignment operator */, 3215 PDiag(), 3216 ExceptionType, SourceLocation(), 3217 OperType, MD->getLocation())) { 3218 HadError = true; 3219 } 3220 } else if (First) { 3221 // We set the declaration to have the computed exception spec here. 3222 // We duplicate the one parameter type. 3223 EPI.RefQualifier = OperType->getRefQualifier(); 3224 EPI.ExtInfo = OperType->getExtInfo(); 3225 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3226 } 3227 3228 if (HadError) { 3229 MD->setInvalidDecl(); 3230 return; 3231 } 3232 3233 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3234 if (First) { 3235 MD->setDeletedAsWritten(); 3236 } else { 3237 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3238 << 2 /* copy assignment operator */; 3239 MD->setInvalidDecl(); 3240 } 3241 } 3242} 3243 3244void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3245 assert(DD->isExplicitlyDefaulted()); 3246 3247 // Whether this was the first-declared instance of the destructor. 3248 bool First = DD == DD->getCanonicalDecl(); 3249 3250 ImplicitExceptionSpecification Spec 3251 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3252 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3253 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3254 *ExceptionType = Context.getFunctionType( 3255 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3256 3257 if (DtorType->hasExceptionSpec()) { 3258 if (CheckEquivalentExceptionSpec( 3259 PDiag(diag::err_incorrect_defaulted_exception_spec) 3260 << 3 /* destructor */, 3261 PDiag(), 3262 ExceptionType, SourceLocation(), 3263 DtorType, DD->getLocation())) { 3264 DD->setInvalidDecl(); 3265 return; 3266 } 3267 } else if (First) { 3268 // We set the declaration to have the computed exception spec here. 3269 // There are no parameters. 3270 EPI.ExtInfo = DtorType->getExtInfo(); 3271 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3272 } 3273 3274 if (ShouldDeleteDestructor(DD)) { 3275 if (First) { 3276 DD->setDeletedAsWritten(); 3277 } else { 3278 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3279 << 3 /* destructor */; 3280 DD->setInvalidDecl(); 3281 } 3282 } 3283} 3284 3285bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3286 CXXRecordDecl *RD = CD->getParent(); 3287 assert(!RD->isDependentType() && "do deletion after instantiation"); 3288 if (!LangOpts.CPlusPlus0x) 3289 return false; 3290 3291 SourceLocation Loc = CD->getLocation(); 3292 3293 // Do access control from the constructor 3294 ContextRAII CtorContext(*this, CD); 3295 3296 bool Union = RD->isUnion(); 3297 bool AllConst = true; 3298 3299 // We do this because we should never actually use an anonymous 3300 // union's constructor. 3301 if (Union && RD->isAnonymousStructOrUnion()) 3302 return false; 3303 3304 // FIXME: We should put some diagnostic logic right into this function. 3305 3306 // C++0x [class.ctor]/5 3307 // A defaulted default constructor for class X is defined as delete if: 3308 3309 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3310 BE = RD->bases_end(); 3311 BI != BE; ++BI) { 3312 // We'll handle this one later 3313 if (BI->isVirtual()) 3314 continue; 3315 3316 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3317 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3318 3319 // -- any [direct base class] has a type with a destructor that is 3320 // delete or inaccessible from the defaulted default constructor 3321 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3322 if (BaseDtor->isDeleted()) 3323 return true; 3324 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3325 AR_accessible) 3326 return true; 3327 3328 // -- any [direct base class either] has no default constructor or 3329 // overload resolution as applied to [its] default constructor 3330 // results in an ambiguity or in a function that is deleted or 3331 // inaccessible from the defaulted default constructor 3332 InitializedEntity BaseEntity = 3333 InitializedEntity::InitializeBase(Context, BI, 0); 3334 InitializationKind Kind = 3335 InitializationKind::CreateDirect(Loc, Loc, Loc); 3336 3337 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3338 3339 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3340 return true; 3341 } 3342 3343 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3344 BE = RD->vbases_end(); 3345 BI != BE; ++BI) { 3346 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3347 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3348 3349 // -- any [virtual base class] has a type with a destructor that is 3350 // delete or inaccessible from the defaulted default constructor 3351 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3352 if (BaseDtor->isDeleted()) 3353 return true; 3354 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3355 AR_accessible) 3356 return true; 3357 3358 // -- any [virtual base class either] has no default constructor or 3359 // overload resolution as applied to [its] default constructor 3360 // results in an ambiguity or in a function that is deleted or 3361 // inaccessible from the defaulted default constructor 3362 InitializedEntity BaseEntity = 3363 InitializedEntity::InitializeBase(Context, BI, BI); 3364 InitializationKind Kind = 3365 InitializationKind::CreateDirect(Loc, Loc, Loc); 3366 3367 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3368 3369 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3370 return true; 3371 } 3372 3373 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3374 FE = RD->field_end(); 3375 FI != FE; ++FI) { 3376 QualType FieldType = Context.getBaseElementType(FI->getType()); 3377 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3378 3379 // -- any non-static data member with no brace-or-equal-initializer is of 3380 // reference type 3381 if (FieldType->isReferenceType()) 3382 return true; 3383 3384 // -- X is a union and all its variant members are of const-qualified type 3385 // (or array thereof) 3386 if (Union && !FieldType.isConstQualified()) 3387 AllConst = false; 3388 3389 if (FieldRecord) { 3390 // -- X is a union-like class that has a variant member with a non-trivial 3391 // default constructor 3392 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3393 return true; 3394 3395 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3396 if (FieldDtor->isDeleted()) 3397 return true; 3398 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3399 AR_accessible) 3400 return true; 3401 3402 // -- any non-variant non-static data member of const-qualified type (or 3403 // array thereof) with no brace-or-equal-initializer does not have a 3404 // user-provided default constructor 3405 if (FieldType.isConstQualified() && 3406 !FieldRecord->hasUserProvidedDefaultConstructor()) 3407 return true; 3408 3409 if (!Union && FieldRecord->isUnion() && 3410 FieldRecord->isAnonymousStructOrUnion()) { 3411 // We're okay to reuse AllConst here since we only care about the 3412 // value otherwise if we're in a union. 3413 AllConst = true; 3414 3415 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3416 UE = FieldRecord->field_end(); 3417 UI != UE; ++UI) { 3418 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3419 CXXRecordDecl *UnionFieldRecord = 3420 UnionFieldType->getAsCXXRecordDecl(); 3421 3422 if (!UnionFieldType.isConstQualified()) 3423 AllConst = false; 3424 3425 if (UnionFieldRecord && 3426 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3427 return true; 3428 } 3429 3430 if (AllConst) 3431 return true; 3432 3433 // Don't try to initialize the anonymous union 3434 // This is technically non-conformant, but sanity demands it. 3435 continue; 3436 } 3437 } else if (!Union && FieldType.isConstQualified()) { 3438 // -- any non-variant non-static data member of const-qualified type (or 3439 // array thereof) with no brace-or-equal-initializer does not have a 3440 // user-provided default constructor 3441 return true; 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(); 3463 assert(!RD->isDependentType() && "do deletion after instantiation"); 3464 if (!LangOpts.CPlusPlus0x) 3465 return false; 3466 3467 SourceLocation Loc = CD->getLocation(); 3468 3469 // Do access control from the constructor 3470 ContextRAII CtorContext(*this, CD); 3471 3472 bool Union = RD->isUnion(); 3473 3474 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3475 "copy assignment arg has no pointee type"); 3476 bool ConstArg = 3477 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3478 3479 // We do this because we should never actually use an anonymous 3480 // union's constructor. 3481 if (Union && RD->isAnonymousStructOrUnion()) 3482 return false; 3483 3484 // FIXME: We should put some diagnostic logic right into this function. 3485 3486 // C++0x [class.copy]/11 3487 // A defaulted [copy] constructor for class X is defined as delete if X has: 3488 3489 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3490 BE = RD->bases_end(); 3491 BI != BE; ++BI) { 3492 // We'll handle this one later 3493 if (BI->isVirtual()) 3494 continue; 3495 3496 QualType BaseType = BI->getType(); 3497 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3498 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3499 3500 // -- any [direct base class] of a type with a destructor that is deleted or 3501 // inaccessible from the defaulted constructor 3502 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3503 if (BaseDtor->isDeleted()) 3504 return true; 3505 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3506 AR_accessible) 3507 return true; 3508 3509 // -- a [direct base class] B that cannot be [copied] because overload 3510 // resolution, as applied to B's [copy] constructor, results in an 3511 // ambiguity or a function that is deleted or inaccessible from the 3512 // defaulted constructor 3513 InitializedEntity BaseEntity = 3514 InitializedEntity::InitializeBase(Context, BI, 0); 3515 InitializationKind Kind = 3516 InitializationKind::CreateDirect(Loc, Loc, Loc); 3517 3518 // Construct a fake expression to perform the copy overloading. 3519 QualType ArgType = BaseType.getUnqualifiedType(); 3520 if (ConstArg) 3521 ArgType.addConst(); 3522 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3523 3524 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3525 3526 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3527 return true; 3528 } 3529 3530 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3531 BE = RD->vbases_end(); 3532 BI != BE; ++BI) { 3533 QualType BaseType = BI->getType(); 3534 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3535 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3536 3537 // -- any [direct base class] of a type with a destructor that is deleted or 3538 // inaccessible from the defaulted constructor 3539 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3540 if (BaseDtor->isDeleted()) 3541 return true; 3542 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3543 AR_accessible) 3544 return true; 3545 3546 // -- a [virtual base class] B that cannot be [copied] because overload 3547 // resolution, as applied to B's [copy] constructor, results in an 3548 // ambiguity or a function that is deleted or inaccessible from the 3549 // defaulted constructor 3550 InitializedEntity BaseEntity = 3551 InitializedEntity::InitializeBase(Context, BI, BI); 3552 InitializationKind Kind = 3553 InitializationKind::CreateDirect(Loc, Loc, Loc); 3554 3555 // Construct a fake expression to perform the copy overloading. 3556 QualType ArgType = BaseType.getUnqualifiedType(); 3557 if (ConstArg) 3558 ArgType.addConst(); 3559 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3560 3561 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3562 3563 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3564 return true; 3565 } 3566 3567 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3568 FE = RD->field_end(); 3569 FI != FE; ++FI) { 3570 QualType FieldType = Context.getBaseElementType(FI->getType()); 3571 3572 // -- for a copy constructor, a non-static data member of rvalue reference 3573 // type 3574 if (FieldType->isRValueReferenceType()) 3575 return true; 3576 3577 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3578 3579 if (FieldRecord) { 3580 // This is an anonymous union 3581 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3582 // Anonymous unions inside unions do not variant members create 3583 if (!Union) { 3584 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3585 UE = FieldRecord->field_end(); 3586 UI != UE; ++UI) { 3587 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3588 CXXRecordDecl *UnionFieldRecord = 3589 UnionFieldType->getAsCXXRecordDecl(); 3590 3591 // -- a variant member with a non-trivial [copy] constructor and X 3592 // is a union-like class 3593 if (UnionFieldRecord && 3594 !UnionFieldRecord->hasTrivialCopyConstructor()) 3595 return true; 3596 } 3597 } 3598 3599 // Don't try to initalize an anonymous union 3600 continue; 3601 } else { 3602 // -- a variant member with a non-trivial [copy] constructor and X is a 3603 // union-like class 3604 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3605 return true; 3606 3607 // -- any [non-static data member] of a type with a destructor that is 3608 // deleted or inaccessible from the defaulted constructor 3609 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3610 if (FieldDtor->isDeleted()) 3611 return true; 3612 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3613 AR_accessible) 3614 return true; 3615 } 3616 } 3617 3618 llvm::SmallVector<InitializedEntity, 4> Entities; 3619 QualType CurType = FI->getType(); 3620 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3621 while (CurType->isArrayType()) { 3622 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3623 Entities.back())); 3624 CurType = Context.getAsArrayType(CurType)->getElementType(); 3625 } 3626 3627 InitializationKind Kind = 3628 InitializationKind::CreateDirect(Loc, Loc, Loc); 3629 3630 // Construct a fake expression to perform the copy overloading. 3631 QualType ArgType = FieldType; 3632 if (ArgType->isReferenceType()) 3633 ArgType = ArgType->getPointeeType(); 3634 else if (ConstArg) 3635 ArgType.addConst(); 3636 Expr *Arg = new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue); 3637 3638 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3639 3640 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3641 return true; 3642 } 3643 3644 return false; 3645} 3646 3647bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3648 CXXRecordDecl *RD = MD->getParent(); 3649 assert(!RD->isDependentType() && "do deletion after instantiation"); 3650 if (!LangOpts.CPlusPlus0x) 3651 return false; 3652 3653 SourceLocation Loc = MD->getLocation(); 3654 3655 // Do access control from the constructor 3656 ContextRAII MethodContext(*this, MD); 3657 3658 bool Union = RD->isUnion(); 3659 3660 bool ConstArg = 3661 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3662 3663 // We do this because we should never actually use an anonymous 3664 // union's constructor. 3665 if (Union && RD->isAnonymousStructOrUnion()) 3666 return false; 3667 3668 DeclarationName OperatorName = 3669 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3670 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3671 R.suppressDiagnostics(); 3672 3673 // FIXME: We should put some diagnostic logic right into this function. 3674 3675 // C++0x [class.copy]/11 3676 // A defaulted [copy] assignment operator for class X is defined as deleted 3677 // if X has: 3678 3679 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3680 BE = RD->bases_end(); 3681 BI != BE; ++BI) { 3682 // We'll handle this one later 3683 if (BI->isVirtual()) 3684 continue; 3685 3686 QualType BaseType = BI->getType(); 3687 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3688 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3689 3690 // -- a [direct base class] B that cannot be [copied] because overload 3691 // resolution, as applied to B's [copy] assignment operator, results in 3692 // an ambiguity or a function that is deleted or inaccessible from the 3693 // assignment operator 3694 3695 LookupQualifiedName(R, BaseDecl, false); 3696 3697 // Filter out any result that isn't a copy-assignment operator. 3698 LookupResult::Filter F = R.makeFilter(); 3699 while (F.hasNext()) { 3700 NamedDecl *D = F.next(); 3701 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3702 if (Method->isCopyAssignmentOperator()) 3703 continue; 3704 3705 F.erase(); 3706 } 3707 F.done(); 3708 3709 // Build a fake argument expression 3710 QualType ArgType = BaseType; 3711 QualType ThisType = BaseType; 3712 if (ConstArg) 3713 ArgType.addConst(); 3714 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3715 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3716 }; 3717 3718 OverloadCandidateSet OCS((Loc)); 3719 OverloadCandidateSet::iterator Best; 3720 3721 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3722 3723 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3724 OR_Success) 3725 return true; 3726 } 3727 3728 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3729 BE = RD->vbases_end(); 3730 BI != BE; ++BI) { 3731 QualType BaseType = BI->getType(); 3732 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3733 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3734 3735 // -- a [virtual base class] B that cannot be [copied] because overload 3736 // resolution, as applied to B's [copy] assignment operator, results in 3737 // an ambiguity or a function that is deleted or inaccessible from the 3738 // assignment operator 3739 3740 LookupQualifiedName(R, BaseDecl, false); 3741 3742 // Filter out any result that isn't a copy-assignment operator. 3743 LookupResult::Filter F = R.makeFilter(); 3744 while (F.hasNext()) { 3745 NamedDecl *D = F.next(); 3746 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3747 if (Method->isCopyAssignmentOperator()) 3748 continue; 3749 3750 F.erase(); 3751 } 3752 F.done(); 3753 3754 // Build a fake argument expression 3755 QualType ArgType = BaseType; 3756 QualType ThisType = BaseType; 3757 if (ConstArg) 3758 ArgType.addConst(); 3759 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3760 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3761 }; 3762 3763 OverloadCandidateSet OCS((Loc)); 3764 OverloadCandidateSet::iterator Best; 3765 3766 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3767 3768 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3769 OR_Success) 3770 return true; 3771 } 3772 3773 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3774 FE = RD->field_end(); 3775 FI != FE; ++FI) { 3776 QualType FieldType = Context.getBaseElementType(FI->getType()); 3777 3778 // -- a non-static data member of reference type 3779 if (FieldType->isReferenceType()) 3780 return true; 3781 3782 // -- a non-static data member of const non-class type (or array thereof) 3783 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3784 return true; 3785 3786 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3787 3788 if (FieldRecord) { 3789 // This is an anonymous union 3790 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3791 // Anonymous unions inside unions do not variant members create 3792 if (!Union) { 3793 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3794 UE = FieldRecord->field_end(); 3795 UI != UE; ++UI) { 3796 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3797 CXXRecordDecl *UnionFieldRecord = 3798 UnionFieldType->getAsCXXRecordDecl(); 3799 3800 // -- a variant member with a non-trivial [copy] assignment operator 3801 // and X is a union-like class 3802 if (UnionFieldRecord && 3803 !UnionFieldRecord->hasTrivialCopyAssignment()) 3804 return true; 3805 } 3806 } 3807 3808 // Don't try to initalize an anonymous union 3809 continue; 3810 // -- a variant member with a non-trivial [copy] assignment operator 3811 // and X is a union-like class 3812 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3813 return true; 3814 } 3815 3816 LookupQualifiedName(R, FieldRecord, false); 3817 3818 // Filter out any result that isn't a copy-assignment operator. 3819 LookupResult::Filter F = R.makeFilter(); 3820 while (F.hasNext()) { 3821 NamedDecl *D = F.next(); 3822 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3823 if (Method->isCopyAssignmentOperator()) 3824 continue; 3825 3826 F.erase(); 3827 } 3828 F.done(); 3829 3830 // Build a fake argument expression 3831 QualType ArgType = FieldType; 3832 QualType ThisType = FieldType; 3833 if (ConstArg) 3834 ArgType.addConst(); 3835 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3836 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3837 }; 3838 3839 OverloadCandidateSet OCS((Loc)); 3840 OverloadCandidateSet::iterator Best; 3841 3842 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3843 3844 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3845 OR_Success) 3846 return true; 3847 } 3848 } 3849 3850 return false; 3851} 3852 3853bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3854 CXXRecordDecl *RD = DD->getParent(); 3855 assert(!RD->isDependentType() && "do deletion after instantiation"); 3856 if (!LangOpts.CPlusPlus0x) 3857 return false; 3858 3859 SourceLocation Loc = DD->getLocation(); 3860 3861 // Do access control from the destructor 3862 ContextRAII CtorContext(*this, DD); 3863 3864 bool Union = RD->isUnion(); 3865 3866 // We do this because we should never actually use an anonymous 3867 // union's destructor. 3868 if (Union && RD->isAnonymousStructOrUnion()) 3869 return false; 3870 3871 // C++0x [class.dtor]p5 3872 // A defaulted destructor for a class X is defined as deleted if: 3873 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3874 BE = RD->bases_end(); 3875 BI != BE; ++BI) { 3876 // We'll handle this one later 3877 if (BI->isVirtual()) 3878 continue; 3879 3880 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3881 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3882 assert(BaseDtor && "base has no destructor"); 3883 3884 // -- any direct or virtual base class has a deleted destructor or 3885 // a destructor that is inaccessible from the defaulted destructor 3886 if (BaseDtor->isDeleted()) 3887 return true; 3888 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3889 AR_accessible) 3890 return true; 3891 } 3892 3893 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3894 BE = RD->vbases_end(); 3895 BI != BE; ++BI) { 3896 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3897 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3898 assert(BaseDtor && "base has no destructor"); 3899 3900 // -- any direct or virtual base class has a deleted destructor or 3901 // a destructor that is inaccessible from the defaulted destructor 3902 if (BaseDtor->isDeleted()) 3903 return true; 3904 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3905 AR_accessible) 3906 return true; 3907 } 3908 3909 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3910 FE = RD->field_end(); 3911 FI != FE; ++FI) { 3912 QualType FieldType = Context.getBaseElementType(FI->getType()); 3913 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3914 if (FieldRecord) { 3915 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3916 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3917 UE = FieldRecord->field_end(); 3918 UI != UE; ++UI) { 3919 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3920 CXXRecordDecl *UnionFieldRecord = 3921 UnionFieldType->getAsCXXRecordDecl(); 3922 3923 // -- X is a union-like class that has a variant member with a non- 3924 // trivial destructor. 3925 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3926 return true; 3927 } 3928 // Technically we are supposed to do this next check unconditionally. 3929 // But that makes absolutely no sense. 3930 } else { 3931 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3932 3933 // -- any of the non-static data members has class type M (or array 3934 // thereof) and M has a deleted destructor or a destructor that is 3935 // inaccessible from the defaulted destructor 3936 if (FieldDtor->isDeleted()) 3937 return true; 3938 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3939 AR_accessible) 3940 return true; 3941 3942 // -- X is a union-like class that has a variant member with a non- 3943 // trivial destructor. 3944 if (Union && !FieldDtor->isTrivial()) 3945 return true; 3946 } 3947 } 3948 } 3949 3950 if (DD->isVirtual()) { 3951 FunctionDecl *OperatorDelete = 0; 3952 DeclarationName Name = 3953 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3954 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3955 false)) 3956 return true; 3957 } 3958 3959 3960 return false; 3961} 3962 3963/// \brief Data used with FindHiddenVirtualMethod 3964namespace { 3965 struct FindHiddenVirtualMethodData { 3966 Sema *S; 3967 CXXMethodDecl *Method; 3968 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3969 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3970 }; 3971} 3972 3973/// \brief Member lookup function that determines whether a given C++ 3974/// method overloads virtual methods in a base class without overriding any, 3975/// to be used with CXXRecordDecl::lookupInBases(). 3976static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3977 CXXBasePath &Path, 3978 void *UserData) { 3979 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3980 3981 FindHiddenVirtualMethodData &Data 3982 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3983 3984 DeclarationName Name = Data.Method->getDeclName(); 3985 assert(Name.getNameKind() == DeclarationName::Identifier); 3986 3987 bool foundSameNameMethod = false; 3988 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3989 for (Path.Decls = BaseRecord->lookup(Name); 3990 Path.Decls.first != Path.Decls.second; 3991 ++Path.Decls.first) { 3992 NamedDecl *D = *Path.Decls.first; 3993 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3994 MD = MD->getCanonicalDecl(); 3995 foundSameNameMethod = true; 3996 // Interested only in hidden virtual methods. 3997 if (!MD->isVirtual()) 3998 continue; 3999 // If the method we are checking overrides a method from its base 4000 // don't warn about the other overloaded methods. 4001 if (!Data.S->IsOverload(Data.Method, MD, false)) 4002 return true; 4003 // Collect the overload only if its hidden. 4004 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4005 overloadedMethods.push_back(MD); 4006 } 4007 } 4008 4009 if (foundSameNameMethod) 4010 Data.OverloadedMethods.append(overloadedMethods.begin(), 4011 overloadedMethods.end()); 4012 return foundSameNameMethod; 4013} 4014 4015/// \brief See if a method overloads virtual methods in a base class without 4016/// overriding any. 4017void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4018 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4019 MD->getLocation()) == Diagnostic::Ignored) 4020 return; 4021 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4022 return; 4023 4024 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4025 /*bool RecordPaths=*/false, 4026 /*bool DetectVirtual=*/false); 4027 FindHiddenVirtualMethodData Data; 4028 Data.Method = MD; 4029 Data.S = this; 4030 4031 // Keep the base methods that were overriden or introduced in the subclass 4032 // by 'using' in a set. A base method not in this set is hidden. 4033 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4034 res.first != res.second; ++res.first) { 4035 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4036 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4037 E = MD->end_overridden_methods(); 4038 I != E; ++I) 4039 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4040 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4041 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4042 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4043 } 4044 4045 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4046 !Data.OverloadedMethods.empty()) { 4047 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4048 << MD << (Data.OverloadedMethods.size() > 1); 4049 4050 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4051 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4052 Diag(overloadedMD->getLocation(), 4053 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4054 } 4055 } 4056} 4057 4058void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4059 Decl *TagDecl, 4060 SourceLocation LBrac, 4061 SourceLocation RBrac, 4062 AttributeList *AttrList) { 4063 if (!TagDecl) 4064 return; 4065 4066 AdjustDeclIfTemplate(TagDecl); 4067 4068 ActOnFields(S, RLoc, TagDecl, 4069 // strict aliasing violation! 4070 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4071 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4072 4073 CheckCompletedCXXClass( 4074 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4075} 4076 4077/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4078/// special functions, such as the default constructor, copy 4079/// constructor, or destructor, to the given C++ class (C++ 4080/// [special]p1). This routine can only be executed just before the 4081/// definition of the class is complete. 4082void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4083 if (!ClassDecl->hasUserDeclaredConstructor()) 4084 ++ASTContext::NumImplicitDefaultConstructors; 4085 4086 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4087 ++ASTContext::NumImplicitCopyConstructors; 4088 4089 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4090 ++ASTContext::NumImplicitCopyAssignmentOperators; 4091 4092 // If we have a dynamic class, then the copy assignment operator may be 4093 // virtual, so we have to declare it immediately. This ensures that, e.g., 4094 // it shows up in the right place in the vtable and that we diagnose 4095 // problems with the implicit exception specification. 4096 if (ClassDecl->isDynamicClass()) 4097 DeclareImplicitCopyAssignment(ClassDecl); 4098 } 4099 4100 if (!ClassDecl->hasUserDeclaredDestructor()) { 4101 ++ASTContext::NumImplicitDestructors; 4102 4103 // If we have a dynamic class, then the destructor may be virtual, so we 4104 // have to declare the destructor immediately. This ensures that, e.g., it 4105 // shows up in the right place in the vtable and that we diagnose problems 4106 // with the implicit exception specification. 4107 if (ClassDecl->isDynamicClass()) 4108 DeclareImplicitDestructor(ClassDecl); 4109 } 4110} 4111 4112void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4113 if (!D) 4114 return; 4115 4116 int NumParamList = D->getNumTemplateParameterLists(); 4117 for (int i = 0; i < NumParamList; i++) { 4118 TemplateParameterList* Params = D->getTemplateParameterList(i); 4119 for (TemplateParameterList::iterator Param = Params->begin(), 4120 ParamEnd = Params->end(); 4121 Param != ParamEnd; ++Param) { 4122 NamedDecl *Named = cast<NamedDecl>(*Param); 4123 if (Named->getDeclName()) { 4124 S->AddDecl(Named); 4125 IdResolver.AddDecl(Named); 4126 } 4127 } 4128 } 4129} 4130 4131void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4132 if (!D) 4133 return; 4134 4135 TemplateParameterList *Params = 0; 4136 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4137 Params = Template->getTemplateParameters(); 4138 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4139 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4140 Params = PartialSpec->getTemplateParameters(); 4141 else 4142 return; 4143 4144 for (TemplateParameterList::iterator Param = Params->begin(), 4145 ParamEnd = Params->end(); 4146 Param != ParamEnd; ++Param) { 4147 NamedDecl *Named = cast<NamedDecl>(*Param); 4148 if (Named->getDeclName()) { 4149 S->AddDecl(Named); 4150 IdResolver.AddDecl(Named); 4151 } 4152 } 4153} 4154 4155void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4156 if (!RecordD) return; 4157 AdjustDeclIfTemplate(RecordD); 4158 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4159 PushDeclContext(S, Record); 4160} 4161 4162void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4163 if (!RecordD) return; 4164 PopDeclContext(); 4165} 4166 4167/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4168/// parsing a top-level (non-nested) C++ class, and we are now 4169/// parsing those parts of the given Method declaration that could 4170/// not be parsed earlier (C++ [class.mem]p2), such as default 4171/// arguments. This action should enter the scope of the given 4172/// Method declaration as if we had just parsed the qualified method 4173/// name. However, it should not bring the parameters into scope; 4174/// that will be performed by ActOnDelayedCXXMethodParameter. 4175void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4176} 4177 4178/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4179/// C++ method declaration. We're (re-)introducing the given 4180/// function parameter into scope for use in parsing later parts of 4181/// the method declaration. For example, we could see an 4182/// ActOnParamDefaultArgument event for this parameter. 4183void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4184 if (!ParamD) 4185 return; 4186 4187 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4188 4189 // If this parameter has an unparsed default argument, clear it out 4190 // to make way for the parsed default argument. 4191 if (Param->hasUnparsedDefaultArg()) 4192 Param->setDefaultArg(0); 4193 4194 S->AddDecl(Param); 4195 if (Param->getDeclName()) 4196 IdResolver.AddDecl(Param); 4197} 4198 4199/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4200/// processing the delayed method declaration for Method. The method 4201/// declaration is now considered finished. There may be a separate 4202/// ActOnStartOfFunctionDef action later (not necessarily 4203/// immediately!) for this method, if it was also defined inside the 4204/// class body. 4205void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4206 if (!MethodD) 4207 return; 4208 4209 AdjustDeclIfTemplate(MethodD); 4210 4211 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4212 4213 // Now that we have our default arguments, check the constructor 4214 // again. It could produce additional diagnostics or affect whether 4215 // the class has implicitly-declared destructors, among other 4216 // things. 4217 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4218 CheckConstructor(Constructor); 4219 4220 // Check the default arguments, which we may have added. 4221 if (!Method->isInvalidDecl()) 4222 CheckCXXDefaultArguments(Method); 4223} 4224 4225/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4226/// the well-formedness of the constructor declarator @p D with type @p 4227/// R. If there are any errors in the declarator, this routine will 4228/// emit diagnostics and set the invalid bit to true. In any case, the type 4229/// will be updated to reflect a well-formed type for the constructor and 4230/// returned. 4231QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4232 StorageClass &SC) { 4233 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4234 4235 // C++ [class.ctor]p3: 4236 // A constructor shall not be virtual (10.3) or static (9.4). A 4237 // constructor can be invoked for a const, volatile or const 4238 // volatile object. A constructor shall not be declared const, 4239 // volatile, or const volatile (9.3.2). 4240 if (isVirtual) { 4241 if (!D.isInvalidType()) 4242 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4243 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4244 << SourceRange(D.getIdentifierLoc()); 4245 D.setInvalidType(); 4246 } 4247 if (SC == SC_Static) { 4248 if (!D.isInvalidType()) 4249 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4250 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4251 << SourceRange(D.getIdentifierLoc()); 4252 D.setInvalidType(); 4253 SC = SC_None; 4254 } 4255 4256 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4257 if (FTI.TypeQuals != 0) { 4258 if (FTI.TypeQuals & Qualifiers::Const) 4259 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4260 << "const" << SourceRange(D.getIdentifierLoc()); 4261 if (FTI.TypeQuals & Qualifiers::Volatile) 4262 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4263 << "volatile" << SourceRange(D.getIdentifierLoc()); 4264 if (FTI.TypeQuals & Qualifiers::Restrict) 4265 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4266 << "restrict" << SourceRange(D.getIdentifierLoc()); 4267 D.setInvalidType(); 4268 } 4269 4270 // C++0x [class.ctor]p4: 4271 // A constructor shall not be declared with a ref-qualifier. 4272 if (FTI.hasRefQualifier()) { 4273 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4274 << FTI.RefQualifierIsLValueRef 4275 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4276 D.setInvalidType(); 4277 } 4278 4279 // Rebuild the function type "R" without any type qualifiers (in 4280 // case any of the errors above fired) and with "void" as the 4281 // return type, since constructors don't have return types. 4282 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4283 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4284 return R; 4285 4286 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4287 EPI.TypeQuals = 0; 4288 EPI.RefQualifier = RQ_None; 4289 4290 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4291 Proto->getNumArgs(), EPI); 4292} 4293 4294/// CheckConstructor - Checks a fully-formed constructor for 4295/// well-formedness, issuing any diagnostics required. Returns true if 4296/// the constructor declarator is invalid. 4297void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4298 CXXRecordDecl *ClassDecl 4299 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4300 if (!ClassDecl) 4301 return Constructor->setInvalidDecl(); 4302 4303 // C++ [class.copy]p3: 4304 // A declaration of a constructor for a class X is ill-formed if 4305 // its first parameter is of type (optionally cv-qualified) X and 4306 // either there are no other parameters or else all other 4307 // parameters have default arguments. 4308 if (!Constructor->isInvalidDecl() && 4309 ((Constructor->getNumParams() == 1) || 4310 (Constructor->getNumParams() > 1 && 4311 Constructor->getParamDecl(1)->hasDefaultArg())) && 4312 Constructor->getTemplateSpecializationKind() 4313 != TSK_ImplicitInstantiation) { 4314 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4315 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4316 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4317 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4318 const char *ConstRef 4319 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4320 : " const &"; 4321 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4322 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4323 4324 // FIXME: Rather that making the constructor invalid, we should endeavor 4325 // to fix the type. 4326 Constructor->setInvalidDecl(); 4327 } 4328 } 4329} 4330 4331/// CheckDestructor - Checks a fully-formed destructor definition for 4332/// well-formedness, issuing any diagnostics required. Returns true 4333/// on error. 4334bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4335 CXXRecordDecl *RD = Destructor->getParent(); 4336 4337 if (Destructor->isVirtual()) { 4338 SourceLocation Loc; 4339 4340 if (!Destructor->isImplicit()) 4341 Loc = Destructor->getLocation(); 4342 else 4343 Loc = RD->getLocation(); 4344 4345 // If we have a virtual destructor, look up the deallocation function 4346 FunctionDecl *OperatorDelete = 0; 4347 DeclarationName Name = 4348 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4349 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4350 return true; 4351 4352 MarkDeclarationReferenced(Loc, OperatorDelete); 4353 4354 Destructor->setOperatorDelete(OperatorDelete); 4355 } 4356 4357 return false; 4358} 4359 4360static inline bool 4361FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4362 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4363 FTI.ArgInfo[0].Param && 4364 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4365} 4366 4367/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4368/// the well-formednes of the destructor declarator @p D with type @p 4369/// R. If there are any errors in the declarator, this routine will 4370/// emit diagnostics and set the declarator to invalid. Even if this happens, 4371/// will be updated to reflect a well-formed type for the destructor and 4372/// returned. 4373QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4374 StorageClass& SC) { 4375 // C++ [class.dtor]p1: 4376 // [...] A typedef-name that names a class is a class-name 4377 // (7.1.3); however, a typedef-name that names a class shall not 4378 // be used as the identifier in the declarator for a destructor 4379 // declaration. 4380 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4381 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4382 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4383 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4384 else if (const TemplateSpecializationType *TST = 4385 DeclaratorType->getAs<TemplateSpecializationType>()) 4386 if (TST->isTypeAlias()) 4387 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4388 << DeclaratorType << 1; 4389 4390 // C++ [class.dtor]p2: 4391 // A destructor is used to destroy objects of its class type. A 4392 // destructor takes no parameters, and no return type can be 4393 // specified for it (not even void). The address of a destructor 4394 // shall not be taken. A destructor shall not be static. A 4395 // destructor can be invoked for a const, volatile or const 4396 // volatile object. A destructor shall not be declared const, 4397 // volatile or const volatile (9.3.2). 4398 if (SC == SC_Static) { 4399 if (!D.isInvalidType()) 4400 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4401 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4402 << SourceRange(D.getIdentifierLoc()) 4403 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4404 4405 SC = SC_None; 4406 } 4407 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4408 // Destructors don't have return types, but the parser will 4409 // happily parse something like: 4410 // 4411 // class X { 4412 // float ~X(); 4413 // }; 4414 // 4415 // The return type will be eliminated later. 4416 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4417 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4418 << SourceRange(D.getIdentifierLoc()); 4419 } 4420 4421 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4422 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4423 if (FTI.TypeQuals & Qualifiers::Const) 4424 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4425 << "const" << SourceRange(D.getIdentifierLoc()); 4426 if (FTI.TypeQuals & Qualifiers::Volatile) 4427 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4428 << "volatile" << SourceRange(D.getIdentifierLoc()); 4429 if (FTI.TypeQuals & Qualifiers::Restrict) 4430 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4431 << "restrict" << SourceRange(D.getIdentifierLoc()); 4432 D.setInvalidType(); 4433 } 4434 4435 // C++0x [class.dtor]p2: 4436 // A destructor shall not be declared with a ref-qualifier. 4437 if (FTI.hasRefQualifier()) { 4438 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4439 << FTI.RefQualifierIsLValueRef 4440 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4441 D.setInvalidType(); 4442 } 4443 4444 // Make sure we don't have any parameters. 4445 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4446 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4447 4448 // Delete the parameters. 4449 FTI.freeArgs(); 4450 D.setInvalidType(); 4451 } 4452 4453 // Make sure the destructor isn't variadic. 4454 if (FTI.isVariadic) { 4455 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4456 D.setInvalidType(); 4457 } 4458 4459 // Rebuild the function type "R" without any type qualifiers or 4460 // parameters (in case any of the errors above fired) and with 4461 // "void" as the return type, since destructors don't have return 4462 // types. 4463 if (!D.isInvalidType()) 4464 return R; 4465 4466 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4467 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4468 EPI.Variadic = false; 4469 EPI.TypeQuals = 0; 4470 EPI.RefQualifier = RQ_None; 4471 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4472} 4473 4474/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4475/// well-formednes of the conversion function declarator @p D with 4476/// type @p R. If there are any errors in the declarator, this routine 4477/// will emit diagnostics and return true. Otherwise, it will return 4478/// false. Either way, the type @p R will be updated to reflect a 4479/// well-formed type for the conversion operator. 4480void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4481 StorageClass& SC) { 4482 // C++ [class.conv.fct]p1: 4483 // Neither parameter types nor return type can be specified. The 4484 // type of a conversion function (8.3.5) is "function taking no 4485 // parameter returning conversion-type-id." 4486 if (SC == SC_Static) { 4487 if (!D.isInvalidType()) 4488 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4489 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4490 << SourceRange(D.getIdentifierLoc()); 4491 D.setInvalidType(); 4492 SC = SC_None; 4493 } 4494 4495 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4496 4497 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4498 // Conversion functions don't have return types, but the parser will 4499 // happily parse something like: 4500 // 4501 // class X { 4502 // float operator bool(); 4503 // }; 4504 // 4505 // The return type will be changed later anyway. 4506 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4507 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4508 << SourceRange(D.getIdentifierLoc()); 4509 D.setInvalidType(); 4510 } 4511 4512 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4513 4514 // Make sure we don't have any parameters. 4515 if (Proto->getNumArgs() > 0) { 4516 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4517 4518 // Delete the parameters. 4519 D.getFunctionTypeInfo().freeArgs(); 4520 D.setInvalidType(); 4521 } else if (Proto->isVariadic()) { 4522 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4523 D.setInvalidType(); 4524 } 4525 4526 // Diagnose "&operator bool()" and other such nonsense. This 4527 // is actually a gcc extension which we don't support. 4528 if (Proto->getResultType() != ConvType) { 4529 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4530 << Proto->getResultType(); 4531 D.setInvalidType(); 4532 ConvType = Proto->getResultType(); 4533 } 4534 4535 // C++ [class.conv.fct]p4: 4536 // The conversion-type-id shall not represent a function type nor 4537 // an array type. 4538 if (ConvType->isArrayType()) { 4539 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4540 ConvType = Context.getPointerType(ConvType); 4541 D.setInvalidType(); 4542 } else if (ConvType->isFunctionType()) { 4543 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4544 ConvType = Context.getPointerType(ConvType); 4545 D.setInvalidType(); 4546 } 4547 4548 // Rebuild the function type "R" without any parameters (in case any 4549 // of the errors above fired) and with the conversion type as the 4550 // return type. 4551 if (D.isInvalidType()) 4552 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4553 4554 // C++0x explicit conversion operators. 4555 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4556 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4557 diag::warn_explicit_conversion_functions) 4558 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4559} 4560 4561/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4562/// the declaration of the given C++ conversion function. This routine 4563/// is responsible for recording the conversion function in the C++ 4564/// class, if possible. 4565Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4566 assert(Conversion && "Expected to receive a conversion function declaration"); 4567 4568 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4569 4570 // Make sure we aren't redeclaring the conversion function. 4571 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4572 4573 // C++ [class.conv.fct]p1: 4574 // [...] A conversion function is never used to convert a 4575 // (possibly cv-qualified) object to the (possibly cv-qualified) 4576 // same object type (or a reference to it), to a (possibly 4577 // cv-qualified) base class of that type (or a reference to it), 4578 // or to (possibly cv-qualified) void. 4579 // FIXME: Suppress this warning if the conversion function ends up being a 4580 // virtual function that overrides a virtual function in a base class. 4581 QualType ClassType 4582 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4583 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4584 ConvType = ConvTypeRef->getPointeeType(); 4585 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4586 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4587 /* Suppress diagnostics for instantiations. */; 4588 else if (ConvType->isRecordType()) { 4589 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4590 if (ConvType == ClassType) 4591 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4592 << ClassType; 4593 else if (IsDerivedFrom(ClassType, ConvType)) 4594 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4595 << ClassType << ConvType; 4596 } else if (ConvType->isVoidType()) { 4597 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4598 << ClassType << ConvType; 4599 } 4600 4601 if (FunctionTemplateDecl *ConversionTemplate 4602 = Conversion->getDescribedFunctionTemplate()) 4603 return ConversionTemplate; 4604 4605 return Conversion; 4606} 4607 4608//===----------------------------------------------------------------------===// 4609// Namespace Handling 4610//===----------------------------------------------------------------------===// 4611 4612 4613 4614/// ActOnStartNamespaceDef - This is called at the start of a namespace 4615/// definition. 4616Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4617 SourceLocation InlineLoc, 4618 SourceLocation NamespaceLoc, 4619 SourceLocation IdentLoc, 4620 IdentifierInfo *II, 4621 SourceLocation LBrace, 4622 AttributeList *AttrList) { 4623 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4624 // For anonymous namespace, take the location of the left brace. 4625 SourceLocation Loc = II ? IdentLoc : LBrace; 4626 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4627 StartLoc, Loc, II); 4628 Namespc->setInline(InlineLoc.isValid()); 4629 4630 Scope *DeclRegionScope = NamespcScope->getParent(); 4631 4632 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4633 4634 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4635 PushNamespaceVisibilityAttr(Attr); 4636 4637 if (II) { 4638 // C++ [namespace.def]p2: 4639 // The identifier in an original-namespace-definition shall not 4640 // have been previously defined in the declarative region in 4641 // which the original-namespace-definition appears. The 4642 // identifier in an original-namespace-definition is the name of 4643 // the namespace. Subsequently in that declarative region, it is 4644 // treated as an original-namespace-name. 4645 // 4646 // Since namespace names are unique in their scope, and we don't 4647 // look through using directives, just look for any ordinary names. 4648 4649 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4650 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4651 Decl::IDNS_Namespace; 4652 NamedDecl *PrevDecl = 0; 4653 for (DeclContext::lookup_result R 4654 = CurContext->getRedeclContext()->lookup(II); 4655 R.first != R.second; ++R.first) { 4656 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4657 PrevDecl = *R.first; 4658 break; 4659 } 4660 } 4661 4662 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4663 // This is an extended namespace definition. 4664 if (Namespc->isInline() != OrigNS->isInline()) { 4665 // inline-ness must match 4666 if (OrigNS->isInline()) { 4667 // The user probably just forgot the 'inline', so suggest that it 4668 // be added back. 4669 Diag(Namespc->getLocation(), 4670 diag::warn_inline_namespace_reopened_noninline) 4671 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4672 } else { 4673 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4674 << Namespc->isInline(); 4675 } 4676 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4677 4678 // Recover by ignoring the new namespace's inline status. 4679 Namespc->setInline(OrigNS->isInline()); 4680 } 4681 4682 // Attach this namespace decl to the chain of extended namespace 4683 // definitions. 4684 OrigNS->setNextNamespace(Namespc); 4685 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4686 4687 // Remove the previous declaration from the scope. 4688 if (DeclRegionScope->isDeclScope(OrigNS)) { 4689 IdResolver.RemoveDecl(OrigNS); 4690 DeclRegionScope->RemoveDecl(OrigNS); 4691 } 4692 } else if (PrevDecl) { 4693 // This is an invalid name redefinition. 4694 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4695 << Namespc->getDeclName(); 4696 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4697 Namespc->setInvalidDecl(); 4698 // Continue on to push Namespc as current DeclContext and return it. 4699 } else if (II->isStr("std") && 4700 CurContext->getRedeclContext()->isTranslationUnit()) { 4701 // This is the first "real" definition of the namespace "std", so update 4702 // our cache of the "std" namespace to point at this definition. 4703 if (NamespaceDecl *StdNS = getStdNamespace()) { 4704 // We had already defined a dummy namespace "std". Link this new 4705 // namespace definition to the dummy namespace "std". 4706 StdNS->setNextNamespace(Namespc); 4707 StdNS->setLocation(IdentLoc); 4708 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4709 } 4710 4711 // Make our StdNamespace cache point at the first real definition of the 4712 // "std" namespace. 4713 StdNamespace = Namespc; 4714 } 4715 4716 PushOnScopeChains(Namespc, DeclRegionScope); 4717 } else { 4718 // Anonymous namespaces. 4719 assert(Namespc->isAnonymousNamespace()); 4720 4721 // Link the anonymous namespace into its parent. 4722 NamespaceDecl *PrevDecl; 4723 DeclContext *Parent = CurContext->getRedeclContext(); 4724 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4725 PrevDecl = TU->getAnonymousNamespace(); 4726 TU->setAnonymousNamespace(Namespc); 4727 } else { 4728 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4729 PrevDecl = ND->getAnonymousNamespace(); 4730 ND->setAnonymousNamespace(Namespc); 4731 } 4732 4733 // Link the anonymous namespace with its previous declaration. 4734 if (PrevDecl) { 4735 assert(PrevDecl->isAnonymousNamespace()); 4736 assert(!PrevDecl->getNextNamespace()); 4737 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4738 PrevDecl->setNextNamespace(Namespc); 4739 4740 if (Namespc->isInline() != PrevDecl->isInline()) { 4741 // inline-ness must match 4742 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4743 << Namespc->isInline(); 4744 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4745 Namespc->setInvalidDecl(); 4746 // Recover by ignoring the new namespace's inline status. 4747 Namespc->setInline(PrevDecl->isInline()); 4748 } 4749 } 4750 4751 CurContext->addDecl(Namespc); 4752 4753 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4754 // behaves as if it were replaced by 4755 // namespace unique { /* empty body */ } 4756 // using namespace unique; 4757 // namespace unique { namespace-body } 4758 // where all occurrences of 'unique' in a translation unit are 4759 // replaced by the same identifier and this identifier differs 4760 // from all other identifiers in the entire program. 4761 4762 // We just create the namespace with an empty name and then add an 4763 // implicit using declaration, just like the standard suggests. 4764 // 4765 // CodeGen enforces the "universally unique" aspect by giving all 4766 // declarations semantically contained within an anonymous 4767 // namespace internal linkage. 4768 4769 if (!PrevDecl) { 4770 UsingDirectiveDecl* UD 4771 = UsingDirectiveDecl::Create(Context, CurContext, 4772 /* 'using' */ LBrace, 4773 /* 'namespace' */ SourceLocation(), 4774 /* qualifier */ NestedNameSpecifierLoc(), 4775 /* identifier */ SourceLocation(), 4776 Namespc, 4777 /* Ancestor */ CurContext); 4778 UD->setImplicit(); 4779 CurContext->addDecl(UD); 4780 } 4781 } 4782 4783 // Although we could have an invalid decl (i.e. the namespace name is a 4784 // redefinition), push it as current DeclContext and try to continue parsing. 4785 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4786 // for the namespace has the declarations that showed up in that particular 4787 // namespace definition. 4788 PushDeclContext(NamespcScope, Namespc); 4789 return Namespc; 4790} 4791 4792/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4793/// is a namespace alias, returns the namespace it points to. 4794static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4795 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4796 return AD->getNamespace(); 4797 return dyn_cast_or_null<NamespaceDecl>(D); 4798} 4799 4800/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4801/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4802void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4803 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4804 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4805 Namespc->setRBraceLoc(RBrace); 4806 PopDeclContext(); 4807 if (Namespc->hasAttr<VisibilityAttr>()) 4808 PopPragmaVisibility(); 4809} 4810 4811CXXRecordDecl *Sema::getStdBadAlloc() const { 4812 return cast_or_null<CXXRecordDecl>( 4813 StdBadAlloc.get(Context.getExternalSource())); 4814} 4815 4816NamespaceDecl *Sema::getStdNamespace() const { 4817 return cast_or_null<NamespaceDecl>( 4818 StdNamespace.get(Context.getExternalSource())); 4819} 4820 4821/// \brief Retrieve the special "std" namespace, which may require us to 4822/// implicitly define the namespace. 4823NamespaceDecl *Sema::getOrCreateStdNamespace() { 4824 if (!StdNamespace) { 4825 // The "std" namespace has not yet been defined, so build one implicitly. 4826 StdNamespace = NamespaceDecl::Create(Context, 4827 Context.getTranslationUnitDecl(), 4828 SourceLocation(), SourceLocation(), 4829 &PP.getIdentifierTable().get("std")); 4830 getStdNamespace()->setImplicit(true); 4831 } 4832 4833 return getStdNamespace(); 4834} 4835 4836/// \brief Determine whether a using statement is in a context where it will be 4837/// apply in all contexts. 4838static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4839 switch (CurContext->getDeclKind()) { 4840 case Decl::TranslationUnit: 4841 return true; 4842 case Decl::LinkageSpec: 4843 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4844 default: 4845 return false; 4846 } 4847} 4848 4849Decl *Sema::ActOnUsingDirective(Scope *S, 4850 SourceLocation UsingLoc, 4851 SourceLocation NamespcLoc, 4852 CXXScopeSpec &SS, 4853 SourceLocation IdentLoc, 4854 IdentifierInfo *NamespcName, 4855 AttributeList *AttrList) { 4856 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4857 assert(NamespcName && "Invalid NamespcName."); 4858 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4859 4860 // This can only happen along a recovery path. 4861 while (S->getFlags() & Scope::TemplateParamScope) 4862 S = S->getParent(); 4863 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4864 4865 UsingDirectiveDecl *UDir = 0; 4866 NestedNameSpecifier *Qualifier = 0; 4867 if (SS.isSet()) 4868 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4869 4870 // Lookup namespace name. 4871 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4872 LookupParsedName(R, S, &SS); 4873 if (R.isAmbiguous()) 4874 return 0; 4875 4876 if (R.empty()) { 4877 // Allow "using namespace std;" or "using namespace ::std;" even if 4878 // "std" hasn't been defined yet, for GCC compatibility. 4879 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4880 NamespcName->isStr("std")) { 4881 Diag(IdentLoc, diag::ext_using_undefined_std); 4882 R.addDecl(getOrCreateStdNamespace()); 4883 R.resolveKind(); 4884 } 4885 // Otherwise, attempt typo correction. 4886 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4887 CTC_NoKeywords, 0)) { 4888 if (R.getAsSingle<NamespaceDecl>() || 4889 R.getAsSingle<NamespaceAliasDecl>()) { 4890 if (DeclContext *DC = computeDeclContext(SS, false)) 4891 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4892 << NamespcName << DC << Corrected << SS.getRange() 4893 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4894 else 4895 Diag(IdentLoc, diag::err_using_directive_suggest) 4896 << NamespcName << Corrected 4897 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4898 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4899 << Corrected; 4900 4901 NamespcName = Corrected.getAsIdentifierInfo(); 4902 } else { 4903 R.clear(); 4904 R.setLookupName(NamespcName); 4905 } 4906 } 4907 } 4908 4909 if (!R.empty()) { 4910 NamedDecl *Named = R.getFoundDecl(); 4911 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4912 && "expected namespace decl"); 4913 // C++ [namespace.udir]p1: 4914 // A using-directive specifies that the names in the nominated 4915 // namespace can be used in the scope in which the 4916 // using-directive appears after the using-directive. During 4917 // unqualified name lookup (3.4.1), the names appear as if they 4918 // were declared in the nearest enclosing namespace which 4919 // contains both the using-directive and the nominated 4920 // namespace. [Note: in this context, "contains" means "contains 4921 // directly or indirectly". ] 4922 4923 // Find enclosing context containing both using-directive and 4924 // nominated namespace. 4925 NamespaceDecl *NS = getNamespaceDecl(Named); 4926 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4927 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4928 CommonAncestor = CommonAncestor->getParent(); 4929 4930 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4931 SS.getWithLocInContext(Context), 4932 IdentLoc, Named, CommonAncestor); 4933 4934 if (IsUsingDirectiveInToplevelContext(CurContext) && 4935 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4936 Diag(IdentLoc, diag::warn_using_directive_in_header); 4937 } 4938 4939 PushUsingDirective(S, UDir); 4940 } else { 4941 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4942 } 4943 4944 // FIXME: We ignore attributes for now. 4945 return UDir; 4946} 4947 4948void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4949 // If scope has associated entity, then using directive is at namespace 4950 // or translation unit scope. We add UsingDirectiveDecls, into 4951 // it's lookup structure. 4952 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4953 Ctx->addDecl(UDir); 4954 else 4955 // Otherwise it is block-sope. using-directives will affect lookup 4956 // only to the end of scope. 4957 S->PushUsingDirective(UDir); 4958} 4959 4960 4961Decl *Sema::ActOnUsingDeclaration(Scope *S, 4962 AccessSpecifier AS, 4963 bool HasUsingKeyword, 4964 SourceLocation UsingLoc, 4965 CXXScopeSpec &SS, 4966 UnqualifiedId &Name, 4967 AttributeList *AttrList, 4968 bool IsTypeName, 4969 SourceLocation TypenameLoc) { 4970 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4971 4972 switch (Name.getKind()) { 4973 case UnqualifiedId::IK_Identifier: 4974 case UnqualifiedId::IK_OperatorFunctionId: 4975 case UnqualifiedId::IK_LiteralOperatorId: 4976 case UnqualifiedId::IK_ConversionFunctionId: 4977 break; 4978 4979 case UnqualifiedId::IK_ConstructorName: 4980 case UnqualifiedId::IK_ConstructorTemplateId: 4981 // C++0x inherited constructors. 4982 if (getLangOptions().CPlusPlus0x) break; 4983 4984 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4985 << SS.getRange(); 4986 return 0; 4987 4988 case UnqualifiedId::IK_DestructorName: 4989 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4990 << SS.getRange(); 4991 return 0; 4992 4993 case UnqualifiedId::IK_TemplateId: 4994 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4995 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4996 return 0; 4997 } 4998 4999 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5000 DeclarationName TargetName = TargetNameInfo.getName(); 5001 if (!TargetName) 5002 return 0; 5003 5004 // Warn about using declarations. 5005 // TODO: store that the declaration was written without 'using' and 5006 // talk about access decls instead of using decls in the 5007 // diagnostics. 5008 if (!HasUsingKeyword) { 5009 UsingLoc = Name.getSourceRange().getBegin(); 5010 5011 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5012 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5013 } 5014 5015 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5016 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5017 return 0; 5018 5019 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5020 TargetNameInfo, AttrList, 5021 /* IsInstantiation */ false, 5022 IsTypeName, TypenameLoc); 5023 if (UD) 5024 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5025 5026 return UD; 5027} 5028 5029/// \brief Determine whether a using declaration considers the given 5030/// declarations as "equivalent", e.g., if they are redeclarations of 5031/// the same entity or are both typedefs of the same type. 5032static bool 5033IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5034 bool &SuppressRedeclaration) { 5035 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5036 SuppressRedeclaration = false; 5037 return true; 5038 } 5039 5040 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5041 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5042 SuppressRedeclaration = true; 5043 return Context.hasSameType(TD1->getUnderlyingType(), 5044 TD2->getUnderlyingType()); 5045 } 5046 5047 return false; 5048} 5049 5050 5051/// Determines whether to create a using shadow decl for a particular 5052/// decl, given the set of decls existing prior to this using lookup. 5053bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5054 const LookupResult &Previous) { 5055 // Diagnose finding a decl which is not from a base class of the 5056 // current class. We do this now because there are cases where this 5057 // function will silently decide not to build a shadow decl, which 5058 // will pre-empt further diagnostics. 5059 // 5060 // We don't need to do this in C++0x because we do the check once on 5061 // the qualifier. 5062 // 5063 // FIXME: diagnose the following if we care enough: 5064 // struct A { int foo; }; 5065 // struct B : A { using A::foo; }; 5066 // template <class T> struct C : A {}; 5067 // template <class T> struct D : C<T> { using B::foo; } // <--- 5068 // This is invalid (during instantiation) in C++03 because B::foo 5069 // resolves to the using decl in B, which is not a base class of D<T>. 5070 // We can't diagnose it immediately because C<T> is an unknown 5071 // specialization. The UsingShadowDecl in D<T> then points directly 5072 // to A::foo, which will look well-formed when we instantiate. 5073 // The right solution is to not collapse the shadow-decl chain. 5074 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5075 DeclContext *OrigDC = Orig->getDeclContext(); 5076 5077 // Handle enums and anonymous structs. 5078 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5079 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5080 while (OrigRec->isAnonymousStructOrUnion()) 5081 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5082 5083 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5084 if (OrigDC == CurContext) { 5085 Diag(Using->getLocation(), 5086 diag::err_using_decl_nested_name_specifier_is_current_class) 5087 << Using->getQualifierLoc().getSourceRange(); 5088 Diag(Orig->getLocation(), diag::note_using_decl_target); 5089 return true; 5090 } 5091 5092 Diag(Using->getQualifierLoc().getBeginLoc(), 5093 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5094 << Using->getQualifier() 5095 << cast<CXXRecordDecl>(CurContext) 5096 << Using->getQualifierLoc().getSourceRange(); 5097 Diag(Orig->getLocation(), diag::note_using_decl_target); 5098 return true; 5099 } 5100 } 5101 5102 if (Previous.empty()) return false; 5103 5104 NamedDecl *Target = Orig; 5105 if (isa<UsingShadowDecl>(Target)) 5106 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5107 5108 // If the target happens to be one of the previous declarations, we 5109 // don't have a conflict. 5110 // 5111 // FIXME: but we might be increasing its access, in which case we 5112 // should redeclare it. 5113 NamedDecl *NonTag = 0, *Tag = 0; 5114 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5115 I != E; ++I) { 5116 NamedDecl *D = (*I)->getUnderlyingDecl(); 5117 bool Result; 5118 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5119 return Result; 5120 5121 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5122 } 5123 5124 if (Target->isFunctionOrFunctionTemplate()) { 5125 FunctionDecl *FD; 5126 if (isa<FunctionTemplateDecl>(Target)) 5127 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5128 else 5129 FD = cast<FunctionDecl>(Target); 5130 5131 NamedDecl *OldDecl = 0; 5132 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5133 case Ovl_Overload: 5134 return false; 5135 5136 case Ovl_NonFunction: 5137 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5138 break; 5139 5140 // We found a decl with the exact signature. 5141 case Ovl_Match: 5142 // If we're in a record, we want to hide the target, so we 5143 // return true (without a diagnostic) to tell the caller not to 5144 // build a shadow decl. 5145 if (CurContext->isRecord()) 5146 return true; 5147 5148 // If we're not in a record, this is an error. 5149 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5150 break; 5151 } 5152 5153 Diag(Target->getLocation(), diag::note_using_decl_target); 5154 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5155 return true; 5156 } 5157 5158 // Target is not a function. 5159 5160 if (isa<TagDecl>(Target)) { 5161 // No conflict between a tag and a non-tag. 5162 if (!Tag) return false; 5163 5164 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5165 Diag(Target->getLocation(), diag::note_using_decl_target); 5166 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5167 return true; 5168 } 5169 5170 // No conflict between a tag and a non-tag. 5171 if (!NonTag) return false; 5172 5173 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5174 Diag(Target->getLocation(), diag::note_using_decl_target); 5175 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5176 return true; 5177} 5178 5179/// Builds a shadow declaration corresponding to a 'using' declaration. 5180UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5181 UsingDecl *UD, 5182 NamedDecl *Orig) { 5183 5184 // If we resolved to another shadow declaration, just coalesce them. 5185 NamedDecl *Target = Orig; 5186 if (isa<UsingShadowDecl>(Target)) { 5187 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5188 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5189 } 5190 5191 UsingShadowDecl *Shadow 5192 = UsingShadowDecl::Create(Context, CurContext, 5193 UD->getLocation(), UD, Target); 5194 UD->addShadowDecl(Shadow); 5195 5196 Shadow->setAccess(UD->getAccess()); 5197 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5198 Shadow->setInvalidDecl(); 5199 5200 if (S) 5201 PushOnScopeChains(Shadow, S); 5202 else 5203 CurContext->addDecl(Shadow); 5204 5205 5206 return Shadow; 5207} 5208 5209/// Hides a using shadow declaration. This is required by the current 5210/// using-decl implementation when a resolvable using declaration in a 5211/// class is followed by a declaration which would hide or override 5212/// one or more of the using decl's targets; for example: 5213/// 5214/// struct Base { void foo(int); }; 5215/// struct Derived : Base { 5216/// using Base::foo; 5217/// void foo(int); 5218/// }; 5219/// 5220/// The governing language is C++03 [namespace.udecl]p12: 5221/// 5222/// When a using-declaration brings names from a base class into a 5223/// derived class scope, member functions in the derived class 5224/// override and/or hide member functions with the same name and 5225/// parameter types in a base class (rather than conflicting). 5226/// 5227/// There are two ways to implement this: 5228/// (1) optimistically create shadow decls when they're not hidden 5229/// by existing declarations, or 5230/// (2) don't create any shadow decls (or at least don't make them 5231/// visible) until we've fully parsed/instantiated the class. 5232/// The problem with (1) is that we might have to retroactively remove 5233/// a shadow decl, which requires several O(n) operations because the 5234/// decl structures are (very reasonably) not designed for removal. 5235/// (2) avoids this but is very fiddly and phase-dependent. 5236void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5237 if (Shadow->getDeclName().getNameKind() == 5238 DeclarationName::CXXConversionFunctionName) 5239 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5240 5241 // Remove it from the DeclContext... 5242 Shadow->getDeclContext()->removeDecl(Shadow); 5243 5244 // ...and the scope, if applicable... 5245 if (S) { 5246 S->RemoveDecl(Shadow); 5247 IdResolver.RemoveDecl(Shadow); 5248 } 5249 5250 // ...and the using decl. 5251 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5252 5253 // TODO: complain somehow if Shadow was used. It shouldn't 5254 // be possible for this to happen, because...? 5255} 5256 5257/// Builds a using declaration. 5258/// 5259/// \param IsInstantiation - Whether this call arises from an 5260/// instantiation of an unresolved using declaration. We treat 5261/// the lookup differently for these declarations. 5262NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5263 SourceLocation UsingLoc, 5264 CXXScopeSpec &SS, 5265 const DeclarationNameInfo &NameInfo, 5266 AttributeList *AttrList, 5267 bool IsInstantiation, 5268 bool IsTypeName, 5269 SourceLocation TypenameLoc) { 5270 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5271 SourceLocation IdentLoc = NameInfo.getLoc(); 5272 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5273 5274 // FIXME: We ignore attributes for now. 5275 5276 if (SS.isEmpty()) { 5277 Diag(IdentLoc, diag::err_using_requires_qualname); 5278 return 0; 5279 } 5280 5281 // Do the redeclaration lookup in the current scope. 5282 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5283 ForRedeclaration); 5284 Previous.setHideTags(false); 5285 if (S) { 5286 LookupName(Previous, S); 5287 5288 // It is really dumb that we have to do this. 5289 LookupResult::Filter F = Previous.makeFilter(); 5290 while (F.hasNext()) { 5291 NamedDecl *D = F.next(); 5292 if (!isDeclInScope(D, CurContext, S)) 5293 F.erase(); 5294 } 5295 F.done(); 5296 } else { 5297 assert(IsInstantiation && "no scope in non-instantiation"); 5298 assert(CurContext->isRecord() && "scope not record in instantiation"); 5299 LookupQualifiedName(Previous, CurContext); 5300 } 5301 5302 // Check for invalid redeclarations. 5303 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5304 return 0; 5305 5306 // Check for bad qualifiers. 5307 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5308 return 0; 5309 5310 DeclContext *LookupContext = computeDeclContext(SS); 5311 NamedDecl *D; 5312 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5313 if (!LookupContext) { 5314 if (IsTypeName) { 5315 // FIXME: not all declaration name kinds are legal here 5316 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5317 UsingLoc, TypenameLoc, 5318 QualifierLoc, 5319 IdentLoc, NameInfo.getName()); 5320 } else { 5321 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5322 QualifierLoc, NameInfo); 5323 } 5324 } else { 5325 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5326 NameInfo, IsTypeName); 5327 } 5328 D->setAccess(AS); 5329 CurContext->addDecl(D); 5330 5331 if (!LookupContext) return D; 5332 UsingDecl *UD = cast<UsingDecl>(D); 5333 5334 if (RequireCompleteDeclContext(SS, LookupContext)) { 5335 UD->setInvalidDecl(); 5336 return UD; 5337 } 5338 5339 // Constructor inheriting using decls get special treatment. 5340 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5341 if (CheckInheritedConstructorUsingDecl(UD)) 5342 UD->setInvalidDecl(); 5343 return UD; 5344 } 5345 5346 // Otherwise, look up the target name. 5347 5348 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5349 R.setUsingDeclaration(true); 5350 5351 // Unlike most lookups, we don't always want to hide tag 5352 // declarations: tag names are visible through the using declaration 5353 // even if hidden by ordinary names, *except* in a dependent context 5354 // where it's important for the sanity of two-phase lookup. 5355 if (!IsInstantiation) 5356 R.setHideTags(false); 5357 5358 LookupQualifiedName(R, LookupContext); 5359 5360 if (R.empty()) { 5361 Diag(IdentLoc, diag::err_no_member) 5362 << NameInfo.getName() << LookupContext << SS.getRange(); 5363 UD->setInvalidDecl(); 5364 return UD; 5365 } 5366 5367 if (R.isAmbiguous()) { 5368 UD->setInvalidDecl(); 5369 return UD; 5370 } 5371 5372 if (IsTypeName) { 5373 // If we asked for a typename and got a non-type decl, error out. 5374 if (!R.getAsSingle<TypeDecl>()) { 5375 Diag(IdentLoc, diag::err_using_typename_non_type); 5376 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5377 Diag((*I)->getUnderlyingDecl()->getLocation(), 5378 diag::note_using_decl_target); 5379 UD->setInvalidDecl(); 5380 return UD; 5381 } 5382 } else { 5383 // If we asked for a non-typename and we got a type, error out, 5384 // but only if this is an instantiation of an unresolved using 5385 // decl. Otherwise just silently find the type name. 5386 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5387 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5388 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5389 UD->setInvalidDecl(); 5390 return UD; 5391 } 5392 } 5393 5394 // C++0x N2914 [namespace.udecl]p6: 5395 // A using-declaration shall not name a namespace. 5396 if (R.getAsSingle<NamespaceDecl>()) { 5397 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5398 << SS.getRange(); 5399 UD->setInvalidDecl(); 5400 return UD; 5401 } 5402 5403 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5404 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5405 BuildUsingShadowDecl(S, UD, *I); 5406 } 5407 5408 return UD; 5409} 5410 5411/// Additional checks for a using declaration referring to a constructor name. 5412bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5413 if (UD->isTypeName()) { 5414 // FIXME: Cannot specify typename when specifying constructor 5415 return true; 5416 } 5417 5418 const Type *SourceType = UD->getQualifier()->getAsType(); 5419 assert(SourceType && 5420 "Using decl naming constructor doesn't have type in scope spec."); 5421 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5422 5423 // Check whether the named type is a direct base class. 5424 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5425 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5426 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5427 BaseIt != BaseE; ++BaseIt) { 5428 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5429 if (CanonicalSourceType == BaseType) 5430 break; 5431 } 5432 5433 if (BaseIt == BaseE) { 5434 // Did not find SourceType in the bases. 5435 Diag(UD->getUsingLocation(), 5436 diag::err_using_decl_constructor_not_in_direct_base) 5437 << UD->getNameInfo().getSourceRange() 5438 << QualType(SourceType, 0) << TargetClass; 5439 return true; 5440 } 5441 5442 BaseIt->setInheritConstructors(); 5443 5444 return false; 5445} 5446 5447/// Checks that the given using declaration is not an invalid 5448/// redeclaration. Note that this is checking only for the using decl 5449/// itself, not for any ill-formedness among the UsingShadowDecls. 5450bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5451 bool isTypeName, 5452 const CXXScopeSpec &SS, 5453 SourceLocation NameLoc, 5454 const LookupResult &Prev) { 5455 // C++03 [namespace.udecl]p8: 5456 // C++0x [namespace.udecl]p10: 5457 // A using-declaration is a declaration and can therefore be used 5458 // repeatedly where (and only where) multiple declarations are 5459 // allowed. 5460 // 5461 // That's in non-member contexts. 5462 if (!CurContext->getRedeclContext()->isRecord()) 5463 return false; 5464 5465 NestedNameSpecifier *Qual 5466 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5467 5468 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5469 NamedDecl *D = *I; 5470 5471 bool DTypename; 5472 NestedNameSpecifier *DQual; 5473 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5474 DTypename = UD->isTypeName(); 5475 DQual = UD->getQualifier(); 5476 } else if (UnresolvedUsingValueDecl *UD 5477 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5478 DTypename = false; 5479 DQual = UD->getQualifier(); 5480 } else if (UnresolvedUsingTypenameDecl *UD 5481 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5482 DTypename = true; 5483 DQual = UD->getQualifier(); 5484 } else continue; 5485 5486 // using decls differ if one says 'typename' and the other doesn't. 5487 // FIXME: non-dependent using decls? 5488 if (isTypeName != DTypename) continue; 5489 5490 // using decls differ if they name different scopes (but note that 5491 // template instantiation can cause this check to trigger when it 5492 // didn't before instantiation). 5493 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5494 Context.getCanonicalNestedNameSpecifier(DQual)) 5495 continue; 5496 5497 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5498 Diag(D->getLocation(), diag::note_using_decl) << 1; 5499 return true; 5500 } 5501 5502 return false; 5503} 5504 5505 5506/// Checks that the given nested-name qualifier used in a using decl 5507/// in the current context is appropriately related to the current 5508/// scope. If an error is found, diagnoses it and returns true. 5509bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5510 const CXXScopeSpec &SS, 5511 SourceLocation NameLoc) { 5512 DeclContext *NamedContext = computeDeclContext(SS); 5513 5514 if (!CurContext->isRecord()) { 5515 // C++03 [namespace.udecl]p3: 5516 // C++0x [namespace.udecl]p8: 5517 // A using-declaration for a class member shall be a member-declaration. 5518 5519 // If we weren't able to compute a valid scope, it must be a 5520 // dependent class scope. 5521 if (!NamedContext || NamedContext->isRecord()) { 5522 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5523 << SS.getRange(); 5524 return true; 5525 } 5526 5527 // Otherwise, everything is known to be fine. 5528 return false; 5529 } 5530 5531 // The current scope is a record. 5532 5533 // If the named context is dependent, we can't decide much. 5534 if (!NamedContext) { 5535 // FIXME: in C++0x, we can diagnose if we can prove that the 5536 // nested-name-specifier does not refer to a base class, which is 5537 // still possible in some cases. 5538 5539 // Otherwise we have to conservatively report that things might be 5540 // okay. 5541 return false; 5542 } 5543 5544 if (!NamedContext->isRecord()) { 5545 // Ideally this would point at the last name in the specifier, 5546 // but we don't have that level of source info. 5547 Diag(SS.getRange().getBegin(), 5548 diag::err_using_decl_nested_name_specifier_is_not_class) 5549 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5550 return true; 5551 } 5552 5553 if (!NamedContext->isDependentContext() && 5554 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5555 return true; 5556 5557 if (getLangOptions().CPlusPlus0x) { 5558 // C++0x [namespace.udecl]p3: 5559 // In a using-declaration used as a member-declaration, the 5560 // nested-name-specifier shall name a base class of the class 5561 // being defined. 5562 5563 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5564 cast<CXXRecordDecl>(NamedContext))) { 5565 if (CurContext == NamedContext) { 5566 Diag(NameLoc, 5567 diag::err_using_decl_nested_name_specifier_is_current_class) 5568 << SS.getRange(); 5569 return true; 5570 } 5571 5572 Diag(SS.getRange().getBegin(), 5573 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5574 << (NestedNameSpecifier*) SS.getScopeRep() 5575 << cast<CXXRecordDecl>(CurContext) 5576 << SS.getRange(); 5577 return true; 5578 } 5579 5580 return false; 5581 } 5582 5583 // C++03 [namespace.udecl]p4: 5584 // A using-declaration used as a member-declaration shall refer 5585 // to a member of a base class of the class being defined [etc.]. 5586 5587 // Salient point: SS doesn't have to name a base class as long as 5588 // lookup only finds members from base classes. Therefore we can 5589 // diagnose here only if we can prove that that can't happen, 5590 // i.e. if the class hierarchies provably don't intersect. 5591 5592 // TODO: it would be nice if "definitely valid" results were cached 5593 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5594 // need to be repeated. 5595 5596 struct UserData { 5597 llvm::DenseSet<const CXXRecordDecl*> Bases; 5598 5599 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5600 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5601 Data->Bases.insert(Base); 5602 return true; 5603 } 5604 5605 bool hasDependentBases(const CXXRecordDecl *Class) { 5606 return !Class->forallBases(collect, this); 5607 } 5608 5609 /// Returns true if the base is dependent or is one of the 5610 /// accumulated base classes. 5611 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5612 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5613 return !Data->Bases.count(Base); 5614 } 5615 5616 bool mightShareBases(const CXXRecordDecl *Class) { 5617 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5618 } 5619 }; 5620 5621 UserData Data; 5622 5623 // Returns false if we find a dependent base. 5624 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5625 return false; 5626 5627 // Returns false if the class has a dependent base or if it or one 5628 // of its bases is present in the base set of the current context. 5629 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5630 return false; 5631 5632 Diag(SS.getRange().getBegin(), 5633 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5634 << (NestedNameSpecifier*) SS.getScopeRep() 5635 << cast<CXXRecordDecl>(CurContext) 5636 << SS.getRange(); 5637 5638 return true; 5639} 5640 5641Decl *Sema::ActOnAliasDeclaration(Scope *S, 5642 AccessSpecifier AS, 5643 MultiTemplateParamsArg TemplateParamLists, 5644 SourceLocation UsingLoc, 5645 UnqualifiedId &Name, 5646 TypeResult Type) { 5647 // Skip up to the relevant declaration scope. 5648 while (S->getFlags() & Scope::TemplateParamScope) 5649 S = S->getParent(); 5650 assert((S->getFlags() & Scope::DeclScope) && 5651 "got alias-declaration outside of declaration scope"); 5652 5653 if (Type.isInvalid()) 5654 return 0; 5655 5656 bool Invalid = false; 5657 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5658 TypeSourceInfo *TInfo = 0; 5659 GetTypeFromParser(Type.get(), &TInfo); 5660 5661 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5662 return 0; 5663 5664 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5665 UPPC_DeclarationType)) { 5666 Invalid = true; 5667 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5668 TInfo->getTypeLoc().getBeginLoc()); 5669 } 5670 5671 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5672 LookupName(Previous, S); 5673 5674 // Warn about shadowing the name of a template parameter. 5675 if (Previous.isSingleResult() && 5676 Previous.getFoundDecl()->isTemplateParameter()) { 5677 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5678 Previous.getFoundDecl())) 5679 Invalid = true; 5680 Previous.clear(); 5681 } 5682 5683 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5684 "name in alias declaration must be an identifier"); 5685 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5686 Name.StartLocation, 5687 Name.Identifier, TInfo); 5688 5689 NewTD->setAccess(AS); 5690 5691 if (Invalid) 5692 NewTD->setInvalidDecl(); 5693 5694 CheckTypedefForVariablyModifiedType(S, NewTD); 5695 Invalid |= NewTD->isInvalidDecl(); 5696 5697 bool Redeclaration = false; 5698 5699 NamedDecl *NewND; 5700 if (TemplateParamLists.size()) { 5701 TypeAliasTemplateDecl *OldDecl = 0; 5702 TemplateParameterList *OldTemplateParams = 0; 5703 5704 if (TemplateParamLists.size() != 1) { 5705 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5706 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5707 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5708 } 5709 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5710 5711 // Only consider previous declarations in the same scope. 5712 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5713 /*ExplicitInstantiationOrSpecialization*/false); 5714 if (!Previous.empty()) { 5715 Redeclaration = true; 5716 5717 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5718 if (!OldDecl && !Invalid) { 5719 Diag(UsingLoc, diag::err_redefinition_different_kind) 5720 << Name.Identifier; 5721 5722 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5723 if (OldD->getLocation().isValid()) 5724 Diag(OldD->getLocation(), diag::note_previous_definition); 5725 5726 Invalid = true; 5727 } 5728 5729 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5730 if (TemplateParameterListsAreEqual(TemplateParams, 5731 OldDecl->getTemplateParameters(), 5732 /*Complain=*/true, 5733 TPL_TemplateMatch)) 5734 OldTemplateParams = OldDecl->getTemplateParameters(); 5735 else 5736 Invalid = true; 5737 5738 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5739 if (!Invalid && 5740 !Context.hasSameType(OldTD->getUnderlyingType(), 5741 NewTD->getUnderlyingType())) { 5742 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5743 // but we can't reasonably accept it. 5744 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5745 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5746 if (OldTD->getLocation().isValid()) 5747 Diag(OldTD->getLocation(), diag::note_previous_definition); 5748 Invalid = true; 5749 } 5750 } 5751 } 5752 5753 // Merge any previous default template arguments into our parameters, 5754 // and check the parameter list. 5755 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5756 TPC_TypeAliasTemplate)) 5757 return 0; 5758 5759 TypeAliasTemplateDecl *NewDecl = 5760 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5761 Name.Identifier, TemplateParams, 5762 NewTD); 5763 5764 NewDecl->setAccess(AS); 5765 5766 if (Invalid) 5767 NewDecl->setInvalidDecl(); 5768 else if (OldDecl) 5769 NewDecl->setPreviousDeclaration(OldDecl); 5770 5771 NewND = NewDecl; 5772 } else { 5773 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5774 NewND = NewTD; 5775 } 5776 5777 if (!Redeclaration) 5778 PushOnScopeChains(NewND, S); 5779 5780 return NewND; 5781} 5782 5783Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5784 SourceLocation NamespaceLoc, 5785 SourceLocation AliasLoc, 5786 IdentifierInfo *Alias, 5787 CXXScopeSpec &SS, 5788 SourceLocation IdentLoc, 5789 IdentifierInfo *Ident) { 5790 5791 // Lookup the namespace name. 5792 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5793 LookupParsedName(R, S, &SS); 5794 5795 // Check if we have a previous declaration with the same name. 5796 NamedDecl *PrevDecl 5797 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5798 ForRedeclaration); 5799 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5800 PrevDecl = 0; 5801 5802 if (PrevDecl) { 5803 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5804 // We already have an alias with the same name that points to the same 5805 // namespace, so don't create a new one. 5806 // FIXME: At some point, we'll want to create the (redundant) 5807 // declaration to maintain better source information. 5808 if (!R.isAmbiguous() && !R.empty() && 5809 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5810 return 0; 5811 } 5812 5813 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5814 diag::err_redefinition_different_kind; 5815 Diag(AliasLoc, DiagID) << Alias; 5816 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5817 return 0; 5818 } 5819 5820 if (R.isAmbiguous()) 5821 return 0; 5822 5823 if (R.empty()) { 5824 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5825 CTC_NoKeywords, 0)) { 5826 if (R.getAsSingle<NamespaceDecl>() || 5827 R.getAsSingle<NamespaceAliasDecl>()) { 5828 if (DeclContext *DC = computeDeclContext(SS, false)) 5829 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5830 << Ident << DC << Corrected << SS.getRange() 5831 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5832 else 5833 Diag(IdentLoc, diag::err_using_directive_suggest) 5834 << Ident << Corrected 5835 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5836 5837 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5838 << Corrected; 5839 5840 Ident = Corrected.getAsIdentifierInfo(); 5841 } else { 5842 R.clear(); 5843 R.setLookupName(Ident); 5844 } 5845 } 5846 5847 if (R.empty()) { 5848 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5849 return 0; 5850 } 5851 } 5852 5853 NamespaceAliasDecl *AliasDecl = 5854 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5855 Alias, SS.getWithLocInContext(Context), 5856 IdentLoc, R.getFoundDecl()); 5857 5858 PushOnScopeChains(AliasDecl, S); 5859 return AliasDecl; 5860} 5861 5862namespace { 5863 /// \brief Scoped object used to handle the state changes required in Sema 5864 /// to implicitly define the body of a C++ member function; 5865 class ImplicitlyDefinedFunctionScope { 5866 Sema &S; 5867 Sema::ContextRAII SavedContext; 5868 5869 public: 5870 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5871 : S(S), SavedContext(S, Method) 5872 { 5873 S.PushFunctionScope(); 5874 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5875 } 5876 5877 ~ImplicitlyDefinedFunctionScope() { 5878 S.PopExpressionEvaluationContext(); 5879 S.PopFunctionOrBlockScope(); 5880 } 5881 }; 5882} 5883 5884static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5885 CXXRecordDecl *D) { 5886 ASTContext &Context = Self.Context; 5887 QualType ClassType = Context.getTypeDeclType(D); 5888 DeclarationName ConstructorName 5889 = Context.DeclarationNames.getCXXConstructorName( 5890 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5891 5892 DeclContext::lookup_const_iterator Con, ConEnd; 5893 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5894 Con != ConEnd; ++Con) { 5895 // FIXME: In C++0x, a constructor template can be a default constructor. 5896 if (isa<FunctionTemplateDecl>(*Con)) 5897 continue; 5898 5899 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5900 if (Constructor->isDefaultConstructor()) 5901 return Constructor; 5902 } 5903 return 0; 5904} 5905 5906Sema::ImplicitExceptionSpecification 5907Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5908 // C++ [except.spec]p14: 5909 // An implicitly declared special member function (Clause 12) shall have an 5910 // exception-specification. [...] 5911 ImplicitExceptionSpecification ExceptSpec(Context); 5912 5913 // Direct base-class constructors. 5914 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5915 BEnd = ClassDecl->bases_end(); 5916 B != BEnd; ++B) { 5917 if (B->isVirtual()) // Handled below. 5918 continue; 5919 5920 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5921 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5922 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5923 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5924 else if (CXXConstructorDecl *Constructor 5925 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5926 ExceptSpec.CalledDecl(Constructor); 5927 } 5928 } 5929 5930 // Virtual base-class constructors. 5931 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5932 BEnd = ClassDecl->vbases_end(); 5933 B != BEnd; ++B) { 5934 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5935 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5936 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5937 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5938 else if (CXXConstructorDecl *Constructor 5939 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5940 ExceptSpec.CalledDecl(Constructor); 5941 } 5942 } 5943 5944 // Field constructors. 5945 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5946 FEnd = ClassDecl->field_end(); 5947 F != FEnd; ++F) { 5948 if (const RecordType *RecordTy 5949 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5950 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5951 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5952 ExceptSpec.CalledDecl( 5953 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5954 else if (CXXConstructorDecl *Constructor 5955 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5956 ExceptSpec.CalledDecl(Constructor); 5957 } 5958 } 5959 5960 return ExceptSpec; 5961} 5962 5963CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5964 CXXRecordDecl *ClassDecl) { 5965 // C++ [class.ctor]p5: 5966 // A default constructor for a class X is a constructor of class X 5967 // that can be called without an argument. If there is no 5968 // user-declared constructor for class X, a default constructor is 5969 // implicitly declared. An implicitly-declared default constructor 5970 // is an inline public member of its class. 5971 assert(!ClassDecl->hasUserDeclaredConstructor() && 5972 "Should not build implicit default constructor!"); 5973 5974 ImplicitExceptionSpecification Spec = 5975 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5976 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5977 5978 // Create the actual constructor declaration. 5979 CanQualType ClassType 5980 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5981 SourceLocation ClassLoc = ClassDecl->getLocation(); 5982 DeclarationName Name 5983 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5984 DeclarationNameInfo NameInfo(Name, ClassLoc); 5985 CXXConstructorDecl *DefaultCon 5986 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5987 Context.getFunctionType(Context.VoidTy, 5988 0, 0, EPI), 5989 /*TInfo=*/0, 5990 /*isExplicit=*/false, 5991 /*isInline=*/true, 5992 /*isImplicitlyDeclared=*/true); 5993 DefaultCon->setAccess(AS_public); 5994 DefaultCon->setDefaulted(); 5995 DefaultCon->setImplicit(); 5996 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5997 5998 // Note that we have declared this constructor. 5999 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6000 6001 if (Scope *S = getScopeForContext(ClassDecl)) 6002 PushOnScopeChains(DefaultCon, S, false); 6003 ClassDecl->addDecl(DefaultCon); 6004 6005 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6006 DefaultCon->setDeletedAsWritten(); 6007 6008 return DefaultCon; 6009} 6010 6011void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6012 CXXConstructorDecl *Constructor) { 6013 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6014 !Constructor->doesThisDeclarationHaveABody() && 6015 !Constructor->isDeleted()) && 6016 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6017 6018 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6019 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6020 6021 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6022 DiagnosticErrorTrap Trap(Diags); 6023 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6024 Trap.hasErrorOccurred()) { 6025 Diag(CurrentLocation, diag::note_member_synthesized_at) 6026 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6027 Constructor->setInvalidDecl(); 6028 return; 6029 } 6030 6031 SourceLocation Loc = Constructor->getLocation(); 6032 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6033 6034 Constructor->setUsed(); 6035 MarkVTableUsed(CurrentLocation, ClassDecl); 6036 6037 if (ASTMutationListener *L = getASTMutationListener()) { 6038 L->CompletedImplicitDefinition(Constructor); 6039 } 6040} 6041 6042void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6043 // We start with an initial pass over the base classes to collect those that 6044 // inherit constructors from. If there are none, we can forgo all further 6045 // processing. 6046 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6047 BasesVector BasesToInheritFrom; 6048 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6049 BaseE = ClassDecl->bases_end(); 6050 BaseIt != BaseE; ++BaseIt) { 6051 if (BaseIt->getInheritConstructors()) { 6052 QualType Base = BaseIt->getType(); 6053 if (Base->isDependentType()) { 6054 // If we inherit constructors from anything that is dependent, just 6055 // abort processing altogether. We'll get another chance for the 6056 // instantiations. 6057 return; 6058 } 6059 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6060 } 6061 } 6062 if (BasesToInheritFrom.empty()) 6063 return; 6064 6065 // Now collect the constructors that we already have in the current class. 6066 // Those take precedence over inherited constructors. 6067 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6068 // unless there is a user-declared constructor with the same signature in 6069 // the class where the using-declaration appears. 6070 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6071 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6072 CtorE = ClassDecl->ctor_end(); 6073 CtorIt != CtorE; ++CtorIt) { 6074 ExistingConstructors.insert( 6075 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6076 } 6077 6078 Scope *S = getScopeForContext(ClassDecl); 6079 DeclarationName CreatedCtorName = 6080 Context.DeclarationNames.getCXXConstructorName( 6081 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6082 6083 // Now comes the true work. 6084 // First, we keep a map from constructor types to the base that introduced 6085 // them. Needed for finding conflicting constructors. We also keep the 6086 // actually inserted declarations in there, for pretty diagnostics. 6087 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6088 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6089 ConstructorToSourceMap InheritedConstructors; 6090 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6091 BaseE = BasesToInheritFrom.end(); 6092 BaseIt != BaseE; ++BaseIt) { 6093 const RecordType *Base = *BaseIt; 6094 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6095 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6096 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6097 CtorE = BaseDecl->ctor_end(); 6098 CtorIt != CtorE; ++CtorIt) { 6099 // Find the using declaration for inheriting this base's constructors. 6100 DeclarationName Name = 6101 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6102 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6103 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6104 SourceLocation UsingLoc = UD ? UD->getLocation() : 6105 ClassDecl->getLocation(); 6106 6107 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6108 // from the class X named in the using-declaration consists of actual 6109 // constructors and notional constructors that result from the 6110 // transformation of defaulted parameters as follows: 6111 // - all non-template default constructors of X, and 6112 // - for each non-template constructor of X that has at least one 6113 // parameter with a default argument, the set of constructors that 6114 // results from omitting any ellipsis parameter specification and 6115 // successively omitting parameters with a default argument from the 6116 // end of the parameter-type-list. 6117 CXXConstructorDecl *BaseCtor = *CtorIt; 6118 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6119 const FunctionProtoType *BaseCtorType = 6120 BaseCtor->getType()->getAs<FunctionProtoType>(); 6121 6122 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6123 maxParams = BaseCtor->getNumParams(); 6124 params <= maxParams; ++params) { 6125 // Skip default constructors. They're never inherited. 6126 if (params == 0) 6127 continue; 6128 // Skip copy and move constructors for the same reason. 6129 if (CanBeCopyOrMove && params == 1) 6130 continue; 6131 6132 // Build up a function type for this particular constructor. 6133 // FIXME: The working paper does not consider that the exception spec 6134 // for the inheriting constructor might be larger than that of the 6135 // source. This code doesn't yet, either. 6136 const Type *NewCtorType; 6137 if (params == maxParams) 6138 NewCtorType = BaseCtorType; 6139 else { 6140 llvm::SmallVector<QualType, 16> Args; 6141 for (unsigned i = 0; i < params; ++i) { 6142 Args.push_back(BaseCtorType->getArgType(i)); 6143 } 6144 FunctionProtoType::ExtProtoInfo ExtInfo = 6145 BaseCtorType->getExtProtoInfo(); 6146 ExtInfo.Variadic = false; 6147 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6148 Args.data(), params, ExtInfo) 6149 .getTypePtr(); 6150 } 6151 const Type *CanonicalNewCtorType = 6152 Context.getCanonicalType(NewCtorType); 6153 6154 // Now that we have the type, first check if the class already has a 6155 // constructor with this signature. 6156 if (ExistingConstructors.count(CanonicalNewCtorType)) 6157 continue; 6158 6159 // Then we check if we have already declared an inherited constructor 6160 // with this signature. 6161 std::pair<ConstructorToSourceMap::iterator, bool> result = 6162 InheritedConstructors.insert(std::make_pair( 6163 CanonicalNewCtorType, 6164 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6165 if (!result.second) { 6166 // Already in the map. If it came from a different class, that's an 6167 // error. Not if it's from the same. 6168 CanQualType PreviousBase = result.first->second.first; 6169 if (CanonicalBase != PreviousBase) { 6170 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6171 const CXXConstructorDecl *PrevBaseCtor = 6172 PrevCtor->getInheritedConstructor(); 6173 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6174 6175 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6176 Diag(BaseCtor->getLocation(), 6177 diag::note_using_decl_constructor_conflict_current_ctor); 6178 Diag(PrevBaseCtor->getLocation(), 6179 diag::note_using_decl_constructor_conflict_previous_ctor); 6180 Diag(PrevCtor->getLocation(), 6181 diag::note_using_decl_constructor_conflict_previous_using); 6182 } 6183 continue; 6184 } 6185 6186 // OK, we're there, now add the constructor. 6187 // C++0x [class.inhctor]p8: [...] that would be performed by a 6188 // user-writtern inline constructor [...] 6189 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6190 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6191 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6192 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6193 /*ImplicitlyDeclared=*/true); 6194 NewCtor->setAccess(BaseCtor->getAccess()); 6195 6196 // Build up the parameter decls and add them. 6197 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6198 for (unsigned i = 0; i < params; ++i) { 6199 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6200 UsingLoc, UsingLoc, 6201 /*IdentifierInfo=*/0, 6202 BaseCtorType->getArgType(i), 6203 /*TInfo=*/0, SC_None, 6204 SC_None, /*DefaultArg=*/0)); 6205 } 6206 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6207 NewCtor->setInheritedConstructor(BaseCtor); 6208 6209 PushOnScopeChains(NewCtor, S, false); 6210 ClassDecl->addDecl(NewCtor); 6211 result.first->second.second = NewCtor; 6212 } 6213 } 6214 } 6215} 6216 6217Sema::ImplicitExceptionSpecification 6218Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6219 // C++ [except.spec]p14: 6220 // An implicitly declared special member function (Clause 12) shall have 6221 // an exception-specification. 6222 ImplicitExceptionSpecification ExceptSpec(Context); 6223 6224 // Direct base-class destructors. 6225 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6226 BEnd = ClassDecl->bases_end(); 6227 B != BEnd; ++B) { 6228 if (B->isVirtual()) // Handled below. 6229 continue; 6230 6231 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6232 ExceptSpec.CalledDecl( 6233 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6234 } 6235 6236 // Virtual base-class destructors. 6237 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6238 BEnd = ClassDecl->vbases_end(); 6239 B != BEnd; ++B) { 6240 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6241 ExceptSpec.CalledDecl( 6242 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6243 } 6244 6245 // Field destructors. 6246 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6247 FEnd = ClassDecl->field_end(); 6248 F != FEnd; ++F) { 6249 if (const RecordType *RecordTy 6250 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6251 ExceptSpec.CalledDecl( 6252 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6253 } 6254 6255 return ExceptSpec; 6256} 6257 6258CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6259 // C++ [class.dtor]p2: 6260 // If a class has no user-declared destructor, a destructor is 6261 // declared implicitly. An implicitly-declared destructor is an 6262 // inline public member of its class. 6263 6264 ImplicitExceptionSpecification Spec = 6265 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6266 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6267 6268 // Create the actual destructor declaration. 6269 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6270 6271 CanQualType ClassType 6272 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6273 SourceLocation ClassLoc = ClassDecl->getLocation(); 6274 DeclarationName Name 6275 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6276 DeclarationNameInfo NameInfo(Name, ClassLoc); 6277 CXXDestructorDecl *Destructor 6278 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6279 /*isInline=*/true, 6280 /*isImplicitlyDeclared=*/true); 6281 Destructor->setAccess(AS_public); 6282 Destructor->setDefaulted(); 6283 Destructor->setImplicit(); 6284 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6285 6286 // Note that we have declared this destructor. 6287 ++ASTContext::NumImplicitDestructorsDeclared; 6288 6289 // Introduce this destructor into its scope. 6290 if (Scope *S = getScopeForContext(ClassDecl)) 6291 PushOnScopeChains(Destructor, S, false); 6292 ClassDecl->addDecl(Destructor); 6293 6294 // This could be uniqued if it ever proves significant. 6295 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6296 6297 if (ShouldDeleteDestructor(Destructor)) 6298 Destructor->setDeletedAsWritten(); 6299 6300 AddOverriddenMethods(ClassDecl, Destructor); 6301 6302 return Destructor; 6303} 6304 6305void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6306 CXXDestructorDecl *Destructor) { 6307 assert((Destructor->isDefaulted() && 6308 !Destructor->doesThisDeclarationHaveABody()) && 6309 "DefineImplicitDestructor - call it for implicit default dtor"); 6310 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6311 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6312 6313 if (Destructor->isInvalidDecl()) 6314 return; 6315 6316 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6317 6318 DiagnosticErrorTrap Trap(Diags); 6319 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6320 Destructor->getParent()); 6321 6322 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6323 Diag(CurrentLocation, diag::note_member_synthesized_at) 6324 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6325 6326 Destructor->setInvalidDecl(); 6327 return; 6328 } 6329 6330 SourceLocation Loc = Destructor->getLocation(); 6331 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6332 6333 Destructor->setUsed(); 6334 MarkVTableUsed(CurrentLocation, ClassDecl); 6335 6336 if (ASTMutationListener *L = getASTMutationListener()) { 6337 L->CompletedImplicitDefinition(Destructor); 6338 } 6339} 6340 6341void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6342 CXXDestructorDecl *destructor) { 6343 // C++11 [class.dtor]p3: 6344 // A declaration of a destructor that does not have an exception- 6345 // specification is implicitly considered to have the same exception- 6346 // specification as an implicit declaration. 6347 const FunctionProtoType *dtorType = destructor->getType()-> 6348 getAs<FunctionProtoType>(); 6349 if (dtorType->hasExceptionSpec()) 6350 return; 6351 6352 ImplicitExceptionSpecification exceptSpec = 6353 ComputeDefaultedDtorExceptionSpec(classDecl); 6354 6355 // Replace the destructor's type. 6356 FunctionProtoType::ExtProtoInfo epi; 6357 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6358 epi.NumExceptions = exceptSpec.size(); 6359 epi.Exceptions = exceptSpec.data(); 6360 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6361 6362 destructor->setType(ty); 6363 6364 // FIXME: If the destructor has a body that could throw, and the newly created 6365 // spec doesn't allow exceptions, we should emit a warning, because this 6366 // change in behavior can break conforming C++03 programs at runtime. 6367 // However, we don't have a body yet, so it needs to be done somewhere else. 6368} 6369 6370/// \brief Builds a statement that copies the given entity from \p From to 6371/// \c To. 6372/// 6373/// This routine is used to copy the members of a class with an 6374/// implicitly-declared copy assignment operator. When the entities being 6375/// copied are arrays, this routine builds for loops to copy them. 6376/// 6377/// \param S The Sema object used for type-checking. 6378/// 6379/// \param Loc The location where the implicit copy is being generated. 6380/// 6381/// \param T The type of the expressions being copied. Both expressions must 6382/// have this type. 6383/// 6384/// \param To The expression we are copying to. 6385/// 6386/// \param From The expression we are copying from. 6387/// 6388/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6389/// Otherwise, it's a non-static member subobject. 6390/// 6391/// \param Depth Internal parameter recording the depth of the recursion. 6392/// 6393/// \returns A statement or a loop that copies the expressions. 6394static StmtResult 6395BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6396 Expr *To, Expr *From, 6397 bool CopyingBaseSubobject, unsigned Depth = 0) { 6398 // C++0x [class.copy]p30: 6399 // Each subobject is assigned in the manner appropriate to its type: 6400 // 6401 // - if the subobject is of class type, the copy assignment operator 6402 // for the class is used (as if by explicit qualification; that is, 6403 // ignoring any possible virtual overriding functions in more derived 6404 // classes); 6405 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6406 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6407 6408 // Look for operator=. 6409 DeclarationName Name 6410 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6411 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6412 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6413 6414 // Filter out any result that isn't a copy-assignment operator. 6415 LookupResult::Filter F = OpLookup.makeFilter(); 6416 while (F.hasNext()) { 6417 NamedDecl *D = F.next(); 6418 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6419 if (Method->isCopyAssignmentOperator()) 6420 continue; 6421 6422 F.erase(); 6423 } 6424 F.done(); 6425 6426 // Suppress the protected check (C++ [class.protected]) for each of the 6427 // assignment operators we found. This strange dance is required when 6428 // we're assigning via a base classes's copy-assignment operator. To 6429 // ensure that we're getting the right base class subobject (without 6430 // ambiguities), we need to cast "this" to that subobject type; to 6431 // ensure that we don't go through the virtual call mechanism, we need 6432 // to qualify the operator= name with the base class (see below). However, 6433 // this means that if the base class has a protected copy assignment 6434 // operator, the protected member access check will fail. So, we 6435 // rewrite "protected" access to "public" access in this case, since we 6436 // know by construction that we're calling from a derived class. 6437 if (CopyingBaseSubobject) { 6438 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6439 L != LEnd; ++L) { 6440 if (L.getAccess() == AS_protected) 6441 L.setAccess(AS_public); 6442 } 6443 } 6444 6445 // Create the nested-name-specifier that will be used to qualify the 6446 // reference to operator=; this is required to suppress the virtual 6447 // call mechanism. 6448 CXXScopeSpec SS; 6449 SS.MakeTrivial(S.Context, 6450 NestedNameSpecifier::Create(S.Context, 0, false, 6451 T.getTypePtr()), 6452 Loc); 6453 6454 // Create the reference to operator=. 6455 ExprResult OpEqualRef 6456 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6457 /*FirstQualifierInScope=*/0, OpLookup, 6458 /*TemplateArgs=*/0, 6459 /*SuppressQualifierCheck=*/true); 6460 if (OpEqualRef.isInvalid()) 6461 return StmtError(); 6462 6463 // Build the call to the assignment operator. 6464 6465 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6466 OpEqualRef.takeAs<Expr>(), 6467 Loc, &From, 1, Loc); 6468 if (Call.isInvalid()) 6469 return StmtError(); 6470 6471 return S.Owned(Call.takeAs<Stmt>()); 6472 } 6473 6474 // - if the subobject is of scalar type, the built-in assignment 6475 // operator is used. 6476 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6477 if (!ArrayTy) { 6478 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6479 if (Assignment.isInvalid()) 6480 return StmtError(); 6481 6482 return S.Owned(Assignment.takeAs<Stmt>()); 6483 } 6484 6485 // - if the subobject is an array, each element is assigned, in the 6486 // manner appropriate to the element type; 6487 6488 // Construct a loop over the array bounds, e.g., 6489 // 6490 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6491 // 6492 // that will copy each of the array elements. 6493 QualType SizeType = S.Context.getSizeType(); 6494 6495 // Create the iteration variable. 6496 IdentifierInfo *IterationVarName = 0; 6497 { 6498 llvm::SmallString<8> Str; 6499 llvm::raw_svector_ostream OS(Str); 6500 OS << "__i" << Depth; 6501 IterationVarName = &S.Context.Idents.get(OS.str()); 6502 } 6503 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6504 IterationVarName, SizeType, 6505 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6506 SC_None, SC_None); 6507 6508 // Initialize the iteration variable to zero. 6509 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6510 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6511 6512 // Create a reference to the iteration variable; we'll use this several 6513 // times throughout. 6514 Expr *IterationVarRef 6515 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6516 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6517 6518 // Create the DeclStmt that holds the iteration variable. 6519 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6520 6521 // Create the comparison against the array bound. 6522 llvm::APInt Upper 6523 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6524 Expr *Comparison 6525 = new (S.Context) BinaryOperator(IterationVarRef, 6526 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6527 BO_NE, S.Context.BoolTy, 6528 VK_RValue, OK_Ordinary, Loc); 6529 6530 // Create the pre-increment of the iteration variable. 6531 Expr *Increment 6532 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6533 VK_LValue, OK_Ordinary, Loc); 6534 6535 // Subscript the "from" and "to" expressions with the iteration variable. 6536 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6537 IterationVarRef, Loc)); 6538 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6539 IterationVarRef, Loc)); 6540 6541 // Build the copy for an individual element of the array. 6542 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6543 To, From, CopyingBaseSubobject, 6544 Depth + 1); 6545 if (Copy.isInvalid()) 6546 return StmtError(); 6547 6548 // Construct the loop that copies all elements of this array. 6549 return S.ActOnForStmt(Loc, Loc, InitStmt, 6550 S.MakeFullExpr(Comparison), 6551 0, S.MakeFullExpr(Increment), 6552 Loc, Copy.take()); 6553} 6554 6555/// \brief Determine whether the given class has a copy assignment operator 6556/// that accepts a const-qualified argument. 6557static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6558 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6559 6560 if (!Class->hasDeclaredCopyAssignment()) 6561 S.DeclareImplicitCopyAssignment(Class); 6562 6563 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6564 DeclarationName OpName 6565 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6566 6567 DeclContext::lookup_const_iterator Op, OpEnd; 6568 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6569 // C++ [class.copy]p9: 6570 // A user-declared copy assignment operator is a non-static non-template 6571 // member function of class X with exactly one parameter of type X, X&, 6572 // const X&, volatile X& or const volatile X&. 6573 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6574 if (!Method) 6575 continue; 6576 6577 if (Method->isStatic()) 6578 continue; 6579 if (Method->getPrimaryTemplate()) 6580 continue; 6581 const FunctionProtoType *FnType = 6582 Method->getType()->getAs<FunctionProtoType>(); 6583 assert(FnType && "Overloaded operator has no prototype."); 6584 // Don't assert on this; an invalid decl might have been left in the AST. 6585 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6586 continue; 6587 bool AcceptsConst = true; 6588 QualType ArgType = FnType->getArgType(0); 6589 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6590 ArgType = Ref->getPointeeType(); 6591 // Is it a non-const lvalue reference? 6592 if (!ArgType.isConstQualified()) 6593 AcceptsConst = false; 6594 } 6595 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6596 continue; 6597 6598 // We have a single argument of type cv X or cv X&, i.e. we've found the 6599 // copy assignment operator. Return whether it accepts const arguments. 6600 return AcceptsConst; 6601 } 6602 assert(Class->isInvalidDecl() && 6603 "No copy assignment operator declared in valid code."); 6604 return false; 6605} 6606 6607std::pair<Sema::ImplicitExceptionSpecification, bool> 6608Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6609 CXXRecordDecl *ClassDecl) { 6610 // C++ [class.copy]p10: 6611 // If the class definition does not explicitly declare a copy 6612 // assignment operator, one is declared implicitly. 6613 // The implicitly-defined copy assignment operator for a class X 6614 // will have the form 6615 // 6616 // X& X::operator=(const X&) 6617 // 6618 // if 6619 bool HasConstCopyAssignment = true; 6620 6621 // -- each direct base class B of X has a copy assignment operator 6622 // whose parameter is of type const B&, const volatile B& or B, 6623 // and 6624 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6625 BaseEnd = ClassDecl->bases_end(); 6626 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6627 assert(!Base->getType()->isDependentType() && 6628 "Cannot generate implicit members for class with dependent bases."); 6629 const CXXRecordDecl *BaseClassDecl 6630 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6631 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6632 } 6633 6634 // -- for all the nonstatic data members of X that are of a class 6635 // type M (or array thereof), each such class type has a copy 6636 // assignment operator whose parameter is of type const M&, 6637 // const volatile M& or M. 6638 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6639 FieldEnd = ClassDecl->field_end(); 6640 HasConstCopyAssignment && Field != FieldEnd; 6641 ++Field) { 6642 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6643 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6644 const CXXRecordDecl *FieldClassDecl 6645 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6646 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6647 } 6648 } 6649 6650 // Otherwise, the implicitly declared copy assignment operator will 6651 // have the form 6652 // 6653 // X& X::operator=(X&) 6654 6655 // C++ [except.spec]p14: 6656 // An implicitly declared special member function (Clause 12) shall have an 6657 // exception-specification. [...] 6658 ImplicitExceptionSpecification ExceptSpec(Context); 6659 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6660 BaseEnd = ClassDecl->bases_end(); 6661 Base != BaseEnd; ++Base) { 6662 CXXRecordDecl *BaseClassDecl 6663 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6664 6665 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6666 DeclareImplicitCopyAssignment(BaseClassDecl); 6667 6668 if (CXXMethodDecl *CopyAssign 6669 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6670 ExceptSpec.CalledDecl(CopyAssign); 6671 } 6672 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6673 FieldEnd = ClassDecl->field_end(); 6674 Field != FieldEnd; 6675 ++Field) { 6676 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6677 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6678 CXXRecordDecl *FieldClassDecl 6679 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6680 6681 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6682 DeclareImplicitCopyAssignment(FieldClassDecl); 6683 6684 if (CXXMethodDecl *CopyAssign 6685 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6686 ExceptSpec.CalledDecl(CopyAssign); 6687 } 6688 } 6689 6690 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6691} 6692 6693CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6694 // Note: The following rules are largely analoguous to the copy 6695 // constructor rules. Note that virtual bases are not taken into account 6696 // for determining the argument type of the operator. Note also that 6697 // operators taking an object instead of a reference are allowed. 6698 6699 ImplicitExceptionSpecification Spec(Context); 6700 bool Const; 6701 llvm::tie(Spec, Const) = 6702 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6703 6704 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6705 QualType RetType = Context.getLValueReferenceType(ArgType); 6706 if (Const) 6707 ArgType = ArgType.withConst(); 6708 ArgType = Context.getLValueReferenceType(ArgType); 6709 6710 // An implicitly-declared copy assignment operator is an inline public 6711 // member of its class. 6712 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6713 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6714 SourceLocation ClassLoc = ClassDecl->getLocation(); 6715 DeclarationNameInfo NameInfo(Name, ClassLoc); 6716 CXXMethodDecl *CopyAssignment 6717 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6718 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6719 /*TInfo=*/0, /*isStatic=*/false, 6720 /*StorageClassAsWritten=*/SC_None, 6721 /*isInline=*/true, 6722 SourceLocation()); 6723 CopyAssignment->setAccess(AS_public); 6724 CopyAssignment->setDefaulted(); 6725 CopyAssignment->setImplicit(); 6726 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6727 6728 // Add the parameter to the operator. 6729 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6730 ClassLoc, ClassLoc, /*Id=*/0, 6731 ArgType, /*TInfo=*/0, 6732 SC_None, 6733 SC_None, 0); 6734 CopyAssignment->setParams(&FromParam, 1); 6735 6736 // Note that we have added this copy-assignment operator. 6737 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6738 6739 if (Scope *S = getScopeForContext(ClassDecl)) 6740 PushOnScopeChains(CopyAssignment, S, false); 6741 ClassDecl->addDecl(CopyAssignment); 6742 6743 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6744 CopyAssignment->setDeletedAsWritten(); 6745 6746 AddOverriddenMethods(ClassDecl, CopyAssignment); 6747 return CopyAssignment; 6748} 6749 6750void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6751 CXXMethodDecl *CopyAssignOperator) { 6752 assert((CopyAssignOperator->isDefaulted() && 6753 CopyAssignOperator->isOverloadedOperator() && 6754 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6755 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6756 "DefineImplicitCopyAssignment called for wrong function"); 6757 6758 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6759 6760 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6761 CopyAssignOperator->setInvalidDecl(); 6762 return; 6763 } 6764 6765 CopyAssignOperator->setUsed(); 6766 6767 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6768 DiagnosticErrorTrap Trap(Diags); 6769 6770 // C++0x [class.copy]p30: 6771 // The implicitly-defined or explicitly-defaulted copy assignment operator 6772 // for a non-union class X performs memberwise copy assignment of its 6773 // subobjects. The direct base classes of X are assigned first, in the 6774 // order of their declaration in the base-specifier-list, and then the 6775 // immediate non-static data members of X are assigned, in the order in 6776 // which they were declared in the class definition. 6777 6778 // The statements that form the synthesized function body. 6779 ASTOwningVector<Stmt*> Statements(*this); 6780 6781 // The parameter for the "other" object, which we are copying from. 6782 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6783 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6784 QualType OtherRefType = Other->getType(); 6785 if (const LValueReferenceType *OtherRef 6786 = OtherRefType->getAs<LValueReferenceType>()) { 6787 OtherRefType = OtherRef->getPointeeType(); 6788 OtherQuals = OtherRefType.getQualifiers(); 6789 } 6790 6791 // Our location for everything implicitly-generated. 6792 SourceLocation Loc = CopyAssignOperator->getLocation(); 6793 6794 // Construct a reference to the "other" object. We'll be using this 6795 // throughout the generated ASTs. 6796 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6797 assert(OtherRef && "Reference to parameter cannot fail!"); 6798 6799 // Construct the "this" pointer. We'll be using this throughout the generated 6800 // ASTs. 6801 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6802 assert(This && "Reference to this cannot fail!"); 6803 6804 // Assign base classes. 6805 bool Invalid = false; 6806 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6807 E = ClassDecl->bases_end(); Base != E; ++Base) { 6808 // Form the assignment: 6809 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6810 QualType BaseType = Base->getType().getUnqualifiedType(); 6811 if (!BaseType->isRecordType()) { 6812 Invalid = true; 6813 continue; 6814 } 6815 6816 CXXCastPath BasePath; 6817 BasePath.push_back(Base); 6818 6819 // Construct the "from" expression, which is an implicit cast to the 6820 // appropriately-qualified base type. 6821 Expr *From = OtherRef; 6822 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6823 CK_UncheckedDerivedToBase, 6824 VK_LValue, &BasePath).take(); 6825 6826 // Dereference "this". 6827 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6828 6829 // Implicitly cast "this" to the appropriately-qualified base type. 6830 To = ImpCastExprToType(To.take(), 6831 Context.getCVRQualifiedType(BaseType, 6832 CopyAssignOperator->getTypeQualifiers()), 6833 CK_UncheckedDerivedToBase, 6834 VK_LValue, &BasePath); 6835 6836 // Build the copy. 6837 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6838 To.get(), From, 6839 /*CopyingBaseSubobject=*/true); 6840 if (Copy.isInvalid()) { 6841 Diag(CurrentLocation, diag::note_member_synthesized_at) 6842 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6843 CopyAssignOperator->setInvalidDecl(); 6844 return; 6845 } 6846 6847 // Success! Record the copy. 6848 Statements.push_back(Copy.takeAs<Expr>()); 6849 } 6850 6851 // \brief Reference to the __builtin_memcpy function. 6852 Expr *BuiltinMemCpyRef = 0; 6853 // \brief Reference to the __builtin_objc_memmove_collectable function. 6854 Expr *CollectableMemCpyRef = 0; 6855 6856 // Assign non-static members. 6857 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6858 FieldEnd = ClassDecl->field_end(); 6859 Field != FieldEnd; ++Field) { 6860 // Check for members of reference type; we can't copy those. 6861 if (Field->getType()->isReferenceType()) { 6862 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6863 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6864 Diag(Field->getLocation(), diag::note_declared_at); 6865 Diag(CurrentLocation, diag::note_member_synthesized_at) 6866 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6867 Invalid = true; 6868 continue; 6869 } 6870 6871 // Check for members of const-qualified, non-class type. 6872 QualType BaseType = Context.getBaseElementType(Field->getType()); 6873 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6874 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6875 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6876 Diag(Field->getLocation(), diag::note_declared_at); 6877 Diag(CurrentLocation, diag::note_member_synthesized_at) 6878 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6879 Invalid = true; 6880 continue; 6881 } 6882 6883 QualType FieldType = Field->getType().getNonReferenceType(); 6884 if (FieldType->isIncompleteArrayType()) { 6885 assert(ClassDecl->hasFlexibleArrayMember() && 6886 "Incomplete array type is not valid"); 6887 continue; 6888 } 6889 6890 // Build references to the field in the object we're copying from and to. 6891 CXXScopeSpec SS; // Intentionally empty 6892 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6893 LookupMemberName); 6894 MemberLookup.addDecl(*Field); 6895 MemberLookup.resolveKind(); 6896 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6897 Loc, /*IsArrow=*/false, 6898 SS, 0, MemberLookup, 0); 6899 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6900 Loc, /*IsArrow=*/true, 6901 SS, 0, MemberLookup, 0); 6902 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6903 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6904 6905 // If the field should be copied with __builtin_memcpy rather than via 6906 // explicit assignments, do so. This optimization only applies for arrays 6907 // of scalars and arrays of class type with trivial copy-assignment 6908 // operators. 6909 if (FieldType->isArrayType() && 6910 (!BaseType->isRecordType() || 6911 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6912 ->hasTrivialCopyAssignment())) { 6913 // Compute the size of the memory buffer to be copied. 6914 QualType SizeType = Context.getSizeType(); 6915 llvm::APInt Size(Context.getTypeSize(SizeType), 6916 Context.getTypeSizeInChars(BaseType).getQuantity()); 6917 for (const ConstantArrayType *Array 6918 = Context.getAsConstantArrayType(FieldType); 6919 Array; 6920 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6921 llvm::APInt ArraySize 6922 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6923 Size *= ArraySize; 6924 } 6925 6926 // Take the address of the field references for "from" and "to". 6927 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6928 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6929 6930 bool NeedsCollectableMemCpy = 6931 (BaseType->isRecordType() && 6932 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6933 6934 if (NeedsCollectableMemCpy) { 6935 if (!CollectableMemCpyRef) { 6936 // Create a reference to the __builtin_objc_memmove_collectable function. 6937 LookupResult R(*this, 6938 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6939 Loc, LookupOrdinaryName); 6940 LookupName(R, TUScope, true); 6941 6942 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6943 if (!CollectableMemCpy) { 6944 // Something went horribly wrong earlier, and we will have 6945 // complained about it. 6946 Invalid = true; 6947 continue; 6948 } 6949 6950 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6951 CollectableMemCpy->getType(), 6952 VK_LValue, Loc, 0).take(); 6953 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6954 } 6955 } 6956 // Create a reference to the __builtin_memcpy builtin function. 6957 else if (!BuiltinMemCpyRef) { 6958 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6959 LookupOrdinaryName); 6960 LookupName(R, TUScope, true); 6961 6962 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6963 if (!BuiltinMemCpy) { 6964 // Something went horribly wrong earlier, and we will have complained 6965 // about it. 6966 Invalid = true; 6967 continue; 6968 } 6969 6970 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6971 BuiltinMemCpy->getType(), 6972 VK_LValue, Loc, 0).take(); 6973 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6974 } 6975 6976 ASTOwningVector<Expr*> CallArgs(*this); 6977 CallArgs.push_back(To.takeAs<Expr>()); 6978 CallArgs.push_back(From.takeAs<Expr>()); 6979 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6980 ExprResult Call = ExprError(); 6981 if (NeedsCollectableMemCpy) 6982 Call = ActOnCallExpr(/*Scope=*/0, 6983 CollectableMemCpyRef, 6984 Loc, move_arg(CallArgs), 6985 Loc); 6986 else 6987 Call = ActOnCallExpr(/*Scope=*/0, 6988 BuiltinMemCpyRef, 6989 Loc, move_arg(CallArgs), 6990 Loc); 6991 6992 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6993 Statements.push_back(Call.takeAs<Expr>()); 6994 continue; 6995 } 6996 6997 // Build the copy of this field. 6998 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6999 To.get(), From.get(), 7000 /*CopyingBaseSubobject=*/false); 7001 if (Copy.isInvalid()) { 7002 Diag(CurrentLocation, diag::note_member_synthesized_at) 7003 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7004 CopyAssignOperator->setInvalidDecl(); 7005 return; 7006 } 7007 7008 // Success! Record the copy. 7009 Statements.push_back(Copy.takeAs<Stmt>()); 7010 } 7011 7012 if (!Invalid) { 7013 // Add a "return *this;" 7014 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7015 7016 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7017 if (Return.isInvalid()) 7018 Invalid = true; 7019 else { 7020 Statements.push_back(Return.takeAs<Stmt>()); 7021 7022 if (Trap.hasErrorOccurred()) { 7023 Diag(CurrentLocation, diag::note_member_synthesized_at) 7024 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7025 Invalid = true; 7026 } 7027 } 7028 } 7029 7030 if (Invalid) { 7031 CopyAssignOperator->setInvalidDecl(); 7032 return; 7033 } 7034 7035 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7036 /*isStmtExpr=*/false); 7037 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7038 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7039 7040 if (ASTMutationListener *L = getASTMutationListener()) { 7041 L->CompletedImplicitDefinition(CopyAssignOperator); 7042 } 7043} 7044 7045std::pair<Sema::ImplicitExceptionSpecification, bool> 7046Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7047 // C++ [class.copy]p5: 7048 // The implicitly-declared copy constructor for a class X will 7049 // have the form 7050 // 7051 // X::X(const X&) 7052 // 7053 // if 7054 bool HasConstCopyConstructor = true; 7055 7056 // -- each direct or virtual base class B of X has a copy 7057 // constructor whose first parameter is of type const B& or 7058 // const volatile B&, and 7059 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7060 BaseEnd = ClassDecl->bases_end(); 7061 HasConstCopyConstructor && Base != BaseEnd; 7062 ++Base) { 7063 // Virtual bases are handled below. 7064 if (Base->isVirtual()) 7065 continue; 7066 7067 CXXRecordDecl *BaseClassDecl 7068 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7069 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7070 DeclareImplicitCopyConstructor(BaseClassDecl); 7071 7072 HasConstCopyConstructor = BaseClassDecl->hasConstCopyConstructor(); 7073 } 7074 7075 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7076 BaseEnd = ClassDecl->vbases_end(); 7077 HasConstCopyConstructor && Base != BaseEnd; 7078 ++Base) { 7079 CXXRecordDecl *BaseClassDecl 7080 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7081 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7082 DeclareImplicitCopyConstructor(BaseClassDecl); 7083 7084 HasConstCopyConstructor= BaseClassDecl->hasConstCopyConstructor(); 7085 } 7086 7087 // -- for all the nonstatic data members of X that are of a 7088 // class type M (or array thereof), each such class type 7089 // has a copy constructor whose first parameter is of type 7090 // const M& or const volatile M&. 7091 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7092 FieldEnd = ClassDecl->field_end(); 7093 HasConstCopyConstructor && Field != FieldEnd; 7094 ++Field) { 7095 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7096 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7097 CXXRecordDecl *FieldClassDecl 7098 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7099 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7100 DeclareImplicitCopyConstructor(FieldClassDecl); 7101 7102 HasConstCopyConstructor = FieldClassDecl->hasConstCopyConstructor(); 7103 } 7104 } 7105 // Otherwise, the implicitly declared copy constructor will have 7106 // the form 7107 // 7108 // X::X(X&) 7109 7110 // C++ [except.spec]p14: 7111 // An implicitly declared special member function (Clause 12) shall have an 7112 // exception-specification. [...] 7113 ImplicitExceptionSpecification ExceptSpec(Context); 7114 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7115 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7116 BaseEnd = ClassDecl->bases_end(); 7117 Base != BaseEnd; 7118 ++Base) { 7119 // Virtual bases are handled below. 7120 if (Base->isVirtual()) 7121 continue; 7122 7123 CXXRecordDecl *BaseClassDecl 7124 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7125 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7126 DeclareImplicitCopyConstructor(BaseClassDecl); 7127 7128 if (CXXConstructorDecl *CopyConstructor 7129 = BaseClassDecl->getCopyConstructor(Quals)) 7130 ExceptSpec.CalledDecl(CopyConstructor); 7131 } 7132 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7133 BaseEnd = ClassDecl->vbases_end(); 7134 Base != BaseEnd; 7135 ++Base) { 7136 CXXRecordDecl *BaseClassDecl 7137 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7138 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 7139 DeclareImplicitCopyConstructor(BaseClassDecl); 7140 7141 if (CXXConstructorDecl *CopyConstructor 7142 = BaseClassDecl->getCopyConstructor(Quals)) 7143 ExceptSpec.CalledDecl(CopyConstructor); 7144 } 7145 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7146 FieldEnd = ClassDecl->field_end(); 7147 Field != FieldEnd; 7148 ++Field) { 7149 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7150 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 7151 CXXRecordDecl *FieldClassDecl 7152 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 7153 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 7154 DeclareImplicitCopyConstructor(FieldClassDecl); 7155 7156 if (CXXConstructorDecl *CopyConstructor 7157 = FieldClassDecl->getCopyConstructor(Quals)) 7158 ExceptSpec.CalledDecl(CopyConstructor); 7159 } 7160 } 7161 7162 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7163} 7164 7165CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7166 CXXRecordDecl *ClassDecl) { 7167 // C++ [class.copy]p4: 7168 // If the class definition does not explicitly declare a copy 7169 // constructor, one is declared implicitly. 7170 7171 ImplicitExceptionSpecification Spec(Context); 7172 bool Const; 7173 llvm::tie(Spec, Const) = 7174 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7175 7176 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7177 QualType ArgType = ClassType; 7178 if (Const) 7179 ArgType = ArgType.withConst(); 7180 ArgType = Context.getLValueReferenceType(ArgType); 7181 7182 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7183 7184 DeclarationName Name 7185 = Context.DeclarationNames.getCXXConstructorName( 7186 Context.getCanonicalType(ClassType)); 7187 SourceLocation ClassLoc = ClassDecl->getLocation(); 7188 DeclarationNameInfo NameInfo(Name, ClassLoc); 7189 7190 // An implicitly-declared copy constructor is an inline public 7191 // member of its class. 7192 CXXConstructorDecl *CopyConstructor 7193 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7194 Context.getFunctionType(Context.VoidTy, 7195 &ArgType, 1, EPI), 7196 /*TInfo=*/0, 7197 /*isExplicit=*/false, 7198 /*isInline=*/true, 7199 /*isImplicitlyDeclared=*/true); 7200 CopyConstructor->setAccess(AS_public); 7201 CopyConstructor->setDefaulted(); 7202 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7203 7204 // Note that we have declared this constructor. 7205 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7206 7207 // Add the parameter to the constructor. 7208 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7209 ClassLoc, ClassLoc, 7210 /*IdentifierInfo=*/0, 7211 ArgType, /*TInfo=*/0, 7212 SC_None, 7213 SC_None, 0); 7214 CopyConstructor->setParams(&FromParam, 1); 7215 7216 if (Scope *S = getScopeForContext(ClassDecl)) 7217 PushOnScopeChains(CopyConstructor, S, false); 7218 ClassDecl->addDecl(CopyConstructor); 7219 7220 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7221 CopyConstructor->setDeletedAsWritten(); 7222 7223 return CopyConstructor; 7224} 7225 7226void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7227 CXXConstructorDecl *CopyConstructor) { 7228 assert((CopyConstructor->isDefaulted() && 7229 CopyConstructor->isCopyConstructor() && 7230 !CopyConstructor->doesThisDeclarationHaveABody()) && 7231 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7232 7233 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7234 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7235 7236 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7237 DiagnosticErrorTrap Trap(Diags); 7238 7239 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7240 Trap.hasErrorOccurred()) { 7241 Diag(CurrentLocation, diag::note_member_synthesized_at) 7242 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7243 CopyConstructor->setInvalidDecl(); 7244 } else { 7245 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7246 CopyConstructor->getLocation(), 7247 MultiStmtArg(*this, 0, 0), 7248 /*isStmtExpr=*/false) 7249 .takeAs<Stmt>()); 7250 } 7251 7252 CopyConstructor->setUsed(); 7253 7254 if (ASTMutationListener *L = getASTMutationListener()) { 7255 L->CompletedImplicitDefinition(CopyConstructor); 7256 } 7257} 7258 7259ExprResult 7260Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7261 CXXConstructorDecl *Constructor, 7262 MultiExprArg ExprArgs, 7263 bool RequiresZeroInit, 7264 unsigned ConstructKind, 7265 SourceRange ParenRange) { 7266 bool Elidable = false; 7267 7268 // C++0x [class.copy]p34: 7269 // When certain criteria are met, an implementation is allowed to 7270 // omit the copy/move construction of a class object, even if the 7271 // copy/move constructor and/or destructor for the object have 7272 // side effects. [...] 7273 // - when a temporary class object that has not been bound to a 7274 // reference (12.2) would be copied/moved to a class object 7275 // with the same cv-unqualified type, the copy/move operation 7276 // can be omitted by constructing the temporary object 7277 // directly into the target of the omitted copy/move 7278 if (ConstructKind == CXXConstructExpr::CK_Complete && 7279 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7280 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7281 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7282 } 7283 7284 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7285 Elidable, move(ExprArgs), RequiresZeroInit, 7286 ConstructKind, ParenRange); 7287} 7288 7289/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7290/// including handling of its default argument expressions. 7291ExprResult 7292Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7293 CXXConstructorDecl *Constructor, bool Elidable, 7294 MultiExprArg ExprArgs, 7295 bool RequiresZeroInit, 7296 unsigned ConstructKind, 7297 SourceRange ParenRange) { 7298 unsigned NumExprs = ExprArgs.size(); 7299 Expr **Exprs = (Expr **)ExprArgs.release(); 7300 7301 for (specific_attr_iterator<NonNullAttr> 7302 i = Constructor->specific_attr_begin<NonNullAttr>(), 7303 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7304 const NonNullAttr *NonNull = *i; 7305 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7306 } 7307 7308 MarkDeclarationReferenced(ConstructLoc, Constructor); 7309 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7310 Constructor, Elidable, Exprs, NumExprs, 7311 RequiresZeroInit, 7312 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7313 ParenRange)); 7314} 7315 7316bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7317 CXXConstructorDecl *Constructor, 7318 MultiExprArg Exprs) { 7319 // FIXME: Provide the correct paren SourceRange when available. 7320 ExprResult TempResult = 7321 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7322 move(Exprs), false, CXXConstructExpr::CK_Complete, 7323 SourceRange()); 7324 if (TempResult.isInvalid()) 7325 return true; 7326 7327 Expr *Temp = TempResult.takeAs<Expr>(); 7328 CheckImplicitConversions(Temp, VD->getLocation()); 7329 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7330 Temp = MaybeCreateExprWithCleanups(Temp); 7331 VD->setInit(Temp); 7332 7333 return false; 7334} 7335 7336void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7337 if (VD->isInvalidDecl()) return; 7338 7339 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7340 if (ClassDecl->isInvalidDecl()) return; 7341 if (ClassDecl->hasTrivialDestructor()) return; 7342 if (ClassDecl->isDependentContext()) return; 7343 7344 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7345 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7346 CheckDestructorAccess(VD->getLocation(), Destructor, 7347 PDiag(diag::err_access_dtor_var) 7348 << VD->getDeclName() 7349 << VD->getType()); 7350 7351 if (!VD->hasGlobalStorage()) return; 7352 7353 // Emit warning for non-trivial dtor in global scope (a real global, 7354 // class-static, function-static). 7355 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7356 7357 // TODO: this should be re-enabled for static locals by !CXAAtExit 7358 if (!VD->isStaticLocal()) 7359 Diag(VD->getLocation(), diag::warn_global_destructor); 7360} 7361 7362/// AddCXXDirectInitializerToDecl - This action is called immediately after 7363/// ActOnDeclarator, when a C++ direct initializer is present. 7364/// e.g: "int x(1);" 7365void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7366 SourceLocation LParenLoc, 7367 MultiExprArg Exprs, 7368 SourceLocation RParenLoc, 7369 bool TypeMayContainAuto) { 7370 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7371 7372 // If there is no declaration, there was an error parsing it. Just ignore 7373 // the initializer. 7374 if (RealDecl == 0) 7375 return; 7376 7377 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7378 if (!VDecl) { 7379 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7380 RealDecl->setInvalidDecl(); 7381 return; 7382 } 7383 7384 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7385 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7386 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7387 if (Exprs.size() > 1) { 7388 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7389 diag::err_auto_var_init_multiple_expressions) 7390 << VDecl->getDeclName() << VDecl->getType() 7391 << VDecl->getSourceRange(); 7392 RealDecl->setInvalidDecl(); 7393 return; 7394 } 7395 7396 Expr *Init = Exprs.get()[0]; 7397 TypeSourceInfo *DeducedType = 0; 7398 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7399 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7400 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7401 << Init->getSourceRange(); 7402 if (!DeducedType) { 7403 RealDecl->setInvalidDecl(); 7404 return; 7405 } 7406 VDecl->setTypeSourceInfo(DeducedType); 7407 VDecl->setType(DeducedType->getType()); 7408 7409 // If this is a redeclaration, check that the type we just deduced matches 7410 // the previously declared type. 7411 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7412 MergeVarDeclTypes(VDecl, Old); 7413 } 7414 7415 // We will represent direct-initialization similarly to copy-initialization: 7416 // int x(1); -as-> int x = 1; 7417 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7418 // 7419 // Clients that want to distinguish between the two forms, can check for 7420 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7421 // A major benefit is that clients that don't particularly care about which 7422 // exactly form was it (like the CodeGen) can handle both cases without 7423 // special case code. 7424 7425 // C++ 8.5p11: 7426 // The form of initialization (using parentheses or '=') is generally 7427 // insignificant, but does matter when the entity being initialized has a 7428 // class type. 7429 7430 if (!VDecl->getType()->isDependentType() && 7431 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7432 diag::err_typecheck_decl_incomplete_type)) { 7433 VDecl->setInvalidDecl(); 7434 return; 7435 } 7436 7437 // The variable can not have an abstract class type. 7438 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7439 diag::err_abstract_type_in_decl, 7440 AbstractVariableType)) 7441 VDecl->setInvalidDecl(); 7442 7443 const VarDecl *Def; 7444 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7445 Diag(VDecl->getLocation(), diag::err_redefinition) 7446 << VDecl->getDeclName(); 7447 Diag(Def->getLocation(), diag::note_previous_definition); 7448 VDecl->setInvalidDecl(); 7449 return; 7450 } 7451 7452 // C++ [class.static.data]p4 7453 // If a static data member is of const integral or const 7454 // enumeration type, its declaration in the class definition can 7455 // specify a constant-initializer which shall be an integral 7456 // constant expression (5.19). In that case, the member can appear 7457 // in integral constant expressions. The member shall still be 7458 // defined in a namespace scope if it is used in the program and the 7459 // namespace scope definition shall not contain an initializer. 7460 // 7461 // We already performed a redefinition check above, but for static 7462 // data members we also need to check whether there was an in-class 7463 // declaration with an initializer. 7464 const VarDecl* PrevInit = 0; 7465 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7466 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7467 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7468 return; 7469 } 7470 7471 bool IsDependent = false; 7472 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7473 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7474 VDecl->setInvalidDecl(); 7475 return; 7476 } 7477 7478 if (Exprs.get()[I]->isTypeDependent()) 7479 IsDependent = true; 7480 } 7481 7482 // If either the declaration has a dependent type or if any of the 7483 // expressions is type-dependent, we represent the initialization 7484 // via a ParenListExpr for later use during template instantiation. 7485 if (VDecl->getType()->isDependentType() || IsDependent) { 7486 // Let clients know that initialization was done with a direct initializer. 7487 VDecl->setCXXDirectInitializer(true); 7488 7489 // Store the initialization expressions as a ParenListExpr. 7490 unsigned NumExprs = Exprs.size(); 7491 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7492 (Expr **)Exprs.release(), 7493 NumExprs, RParenLoc)); 7494 return; 7495 } 7496 7497 // Capture the variable that is being initialized and the style of 7498 // initialization. 7499 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7500 7501 // FIXME: Poor source location information. 7502 InitializationKind Kind 7503 = InitializationKind::CreateDirect(VDecl->getLocation(), 7504 LParenLoc, RParenLoc); 7505 7506 InitializationSequence InitSeq(*this, Entity, Kind, 7507 Exprs.get(), Exprs.size()); 7508 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7509 if (Result.isInvalid()) { 7510 VDecl->setInvalidDecl(); 7511 return; 7512 } 7513 7514 CheckImplicitConversions(Result.get(), LParenLoc); 7515 7516 Result = MaybeCreateExprWithCleanups(Result); 7517 VDecl->setInit(Result.takeAs<Expr>()); 7518 VDecl->setCXXDirectInitializer(true); 7519 7520 CheckCompleteVariableDeclaration(VDecl); 7521} 7522 7523/// \brief Given a constructor and the set of arguments provided for the 7524/// constructor, convert the arguments and add any required default arguments 7525/// to form a proper call to this constructor. 7526/// 7527/// \returns true if an error occurred, false otherwise. 7528bool 7529Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7530 MultiExprArg ArgsPtr, 7531 SourceLocation Loc, 7532 ASTOwningVector<Expr*> &ConvertedArgs) { 7533 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7534 unsigned NumArgs = ArgsPtr.size(); 7535 Expr **Args = (Expr **)ArgsPtr.get(); 7536 7537 const FunctionProtoType *Proto 7538 = Constructor->getType()->getAs<FunctionProtoType>(); 7539 assert(Proto && "Constructor without a prototype?"); 7540 unsigned NumArgsInProto = Proto->getNumArgs(); 7541 7542 // If too few arguments are available, we'll fill in the rest with defaults. 7543 if (NumArgs < NumArgsInProto) 7544 ConvertedArgs.reserve(NumArgsInProto); 7545 else 7546 ConvertedArgs.reserve(NumArgs); 7547 7548 VariadicCallType CallType = 7549 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7550 llvm::SmallVector<Expr *, 8> AllArgs; 7551 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7552 Proto, 0, Args, NumArgs, AllArgs, 7553 CallType); 7554 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7555 ConvertedArgs.push_back(AllArgs[i]); 7556 return Invalid; 7557} 7558 7559static inline bool 7560CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7561 const FunctionDecl *FnDecl) { 7562 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7563 if (isa<NamespaceDecl>(DC)) { 7564 return SemaRef.Diag(FnDecl->getLocation(), 7565 diag::err_operator_new_delete_declared_in_namespace) 7566 << FnDecl->getDeclName(); 7567 } 7568 7569 if (isa<TranslationUnitDecl>(DC) && 7570 FnDecl->getStorageClass() == SC_Static) { 7571 return SemaRef.Diag(FnDecl->getLocation(), 7572 diag::err_operator_new_delete_declared_static) 7573 << FnDecl->getDeclName(); 7574 } 7575 7576 return false; 7577} 7578 7579static inline bool 7580CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7581 CanQualType ExpectedResultType, 7582 CanQualType ExpectedFirstParamType, 7583 unsigned DependentParamTypeDiag, 7584 unsigned InvalidParamTypeDiag) { 7585 QualType ResultType = 7586 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7587 7588 // Check that the result type is not dependent. 7589 if (ResultType->isDependentType()) 7590 return SemaRef.Diag(FnDecl->getLocation(), 7591 diag::err_operator_new_delete_dependent_result_type) 7592 << FnDecl->getDeclName() << ExpectedResultType; 7593 7594 // Check that the result type is what we expect. 7595 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7596 return SemaRef.Diag(FnDecl->getLocation(), 7597 diag::err_operator_new_delete_invalid_result_type) 7598 << FnDecl->getDeclName() << ExpectedResultType; 7599 7600 // A function template must have at least 2 parameters. 7601 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7602 return SemaRef.Diag(FnDecl->getLocation(), 7603 diag::err_operator_new_delete_template_too_few_parameters) 7604 << FnDecl->getDeclName(); 7605 7606 // The function decl must have at least 1 parameter. 7607 if (FnDecl->getNumParams() == 0) 7608 return SemaRef.Diag(FnDecl->getLocation(), 7609 diag::err_operator_new_delete_too_few_parameters) 7610 << FnDecl->getDeclName(); 7611 7612 // Check the the first parameter type is not dependent. 7613 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7614 if (FirstParamType->isDependentType()) 7615 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7616 << FnDecl->getDeclName() << ExpectedFirstParamType; 7617 7618 // Check that the first parameter type is what we expect. 7619 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7620 ExpectedFirstParamType) 7621 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7622 << FnDecl->getDeclName() << ExpectedFirstParamType; 7623 7624 return false; 7625} 7626 7627static bool 7628CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7629 // C++ [basic.stc.dynamic.allocation]p1: 7630 // A program is ill-formed if an allocation function is declared in a 7631 // namespace scope other than global scope or declared static in global 7632 // scope. 7633 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7634 return true; 7635 7636 CanQualType SizeTy = 7637 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7638 7639 // C++ [basic.stc.dynamic.allocation]p1: 7640 // The return type shall be void*. The first parameter shall have type 7641 // std::size_t. 7642 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7643 SizeTy, 7644 diag::err_operator_new_dependent_param_type, 7645 diag::err_operator_new_param_type)) 7646 return true; 7647 7648 // C++ [basic.stc.dynamic.allocation]p1: 7649 // The first parameter shall not have an associated default argument. 7650 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7651 return SemaRef.Diag(FnDecl->getLocation(), 7652 diag::err_operator_new_default_arg) 7653 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7654 7655 return false; 7656} 7657 7658static bool 7659CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7660 // C++ [basic.stc.dynamic.deallocation]p1: 7661 // A program is ill-formed if deallocation functions are declared in a 7662 // namespace scope other than global scope or declared static in global 7663 // scope. 7664 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7665 return true; 7666 7667 // C++ [basic.stc.dynamic.deallocation]p2: 7668 // Each deallocation function shall return void and its first parameter 7669 // shall be void*. 7670 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7671 SemaRef.Context.VoidPtrTy, 7672 diag::err_operator_delete_dependent_param_type, 7673 diag::err_operator_delete_param_type)) 7674 return true; 7675 7676 return false; 7677} 7678 7679/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7680/// of this overloaded operator is well-formed. If so, returns false; 7681/// otherwise, emits appropriate diagnostics and returns true. 7682bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7683 assert(FnDecl && FnDecl->isOverloadedOperator() && 7684 "Expected an overloaded operator declaration"); 7685 7686 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7687 7688 // C++ [over.oper]p5: 7689 // The allocation and deallocation functions, operator new, 7690 // operator new[], operator delete and operator delete[], are 7691 // described completely in 3.7.3. The attributes and restrictions 7692 // found in the rest of this subclause do not apply to them unless 7693 // explicitly stated in 3.7.3. 7694 if (Op == OO_Delete || Op == OO_Array_Delete) 7695 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7696 7697 if (Op == OO_New || Op == OO_Array_New) 7698 return CheckOperatorNewDeclaration(*this, FnDecl); 7699 7700 // C++ [over.oper]p6: 7701 // An operator function shall either be a non-static member 7702 // function or be a non-member function and have at least one 7703 // parameter whose type is a class, a reference to a class, an 7704 // enumeration, or a reference to an enumeration. 7705 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7706 if (MethodDecl->isStatic()) 7707 return Diag(FnDecl->getLocation(), 7708 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7709 } else { 7710 bool ClassOrEnumParam = false; 7711 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7712 ParamEnd = FnDecl->param_end(); 7713 Param != ParamEnd; ++Param) { 7714 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7715 if (ParamType->isDependentType() || ParamType->isRecordType() || 7716 ParamType->isEnumeralType()) { 7717 ClassOrEnumParam = true; 7718 break; 7719 } 7720 } 7721 7722 if (!ClassOrEnumParam) 7723 return Diag(FnDecl->getLocation(), 7724 diag::err_operator_overload_needs_class_or_enum) 7725 << FnDecl->getDeclName(); 7726 } 7727 7728 // C++ [over.oper]p8: 7729 // An operator function cannot have default arguments (8.3.6), 7730 // except where explicitly stated below. 7731 // 7732 // Only the function-call operator allows default arguments 7733 // (C++ [over.call]p1). 7734 if (Op != OO_Call) { 7735 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7736 Param != FnDecl->param_end(); ++Param) { 7737 if ((*Param)->hasDefaultArg()) 7738 return Diag((*Param)->getLocation(), 7739 diag::err_operator_overload_default_arg) 7740 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7741 } 7742 } 7743 7744 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7745 { false, false, false } 7746#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7747 , { Unary, Binary, MemberOnly } 7748#include "clang/Basic/OperatorKinds.def" 7749 }; 7750 7751 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7752 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7753 bool MustBeMemberOperator = OperatorUses[Op][2]; 7754 7755 // C++ [over.oper]p8: 7756 // [...] Operator functions cannot have more or fewer parameters 7757 // than the number required for the corresponding operator, as 7758 // described in the rest of this subclause. 7759 unsigned NumParams = FnDecl->getNumParams() 7760 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7761 if (Op != OO_Call && 7762 ((NumParams == 1 && !CanBeUnaryOperator) || 7763 (NumParams == 2 && !CanBeBinaryOperator) || 7764 (NumParams < 1) || (NumParams > 2))) { 7765 // We have the wrong number of parameters. 7766 unsigned ErrorKind; 7767 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7768 ErrorKind = 2; // 2 -> unary or binary. 7769 } else if (CanBeUnaryOperator) { 7770 ErrorKind = 0; // 0 -> unary 7771 } else { 7772 assert(CanBeBinaryOperator && 7773 "All non-call overloaded operators are unary or binary!"); 7774 ErrorKind = 1; // 1 -> binary 7775 } 7776 7777 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7778 << FnDecl->getDeclName() << NumParams << ErrorKind; 7779 } 7780 7781 // Overloaded operators other than operator() cannot be variadic. 7782 if (Op != OO_Call && 7783 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7784 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7785 << FnDecl->getDeclName(); 7786 } 7787 7788 // Some operators must be non-static member functions. 7789 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7790 return Diag(FnDecl->getLocation(), 7791 diag::err_operator_overload_must_be_member) 7792 << FnDecl->getDeclName(); 7793 } 7794 7795 // C++ [over.inc]p1: 7796 // The user-defined function called operator++ implements the 7797 // prefix and postfix ++ operator. If this function is a member 7798 // function with no parameters, or a non-member function with one 7799 // parameter of class or enumeration type, it defines the prefix 7800 // increment operator ++ for objects of that type. If the function 7801 // is a member function with one parameter (which shall be of type 7802 // int) or a non-member function with two parameters (the second 7803 // of which shall be of type int), it defines the postfix 7804 // increment operator ++ for objects of that type. 7805 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7806 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7807 bool ParamIsInt = false; 7808 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7809 ParamIsInt = BT->getKind() == BuiltinType::Int; 7810 7811 if (!ParamIsInt) 7812 return Diag(LastParam->getLocation(), 7813 diag::err_operator_overload_post_incdec_must_be_int) 7814 << LastParam->getType() << (Op == OO_MinusMinus); 7815 } 7816 7817 return false; 7818} 7819 7820/// CheckLiteralOperatorDeclaration - Check whether the declaration 7821/// of this literal operator function is well-formed. If so, returns 7822/// false; otherwise, emits appropriate diagnostics and returns true. 7823bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7824 DeclContext *DC = FnDecl->getDeclContext(); 7825 Decl::Kind Kind = DC->getDeclKind(); 7826 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7827 Kind != Decl::LinkageSpec) { 7828 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7829 << FnDecl->getDeclName(); 7830 return true; 7831 } 7832 7833 bool Valid = false; 7834 7835 // template <char...> type operator "" name() is the only valid template 7836 // signature, and the only valid signature with no parameters. 7837 if (FnDecl->param_size() == 0) { 7838 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7839 // Must have only one template parameter 7840 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7841 if (Params->size() == 1) { 7842 NonTypeTemplateParmDecl *PmDecl = 7843 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7844 7845 // The template parameter must be a char parameter pack. 7846 if (PmDecl && PmDecl->isTemplateParameterPack() && 7847 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7848 Valid = true; 7849 } 7850 } 7851 } else { 7852 // Check the first parameter 7853 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7854 7855 QualType T = (*Param)->getType(); 7856 7857 // unsigned long long int, long double, and any character type are allowed 7858 // as the only parameters. 7859 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7860 Context.hasSameType(T, Context.LongDoubleTy) || 7861 Context.hasSameType(T, Context.CharTy) || 7862 Context.hasSameType(T, Context.WCharTy) || 7863 Context.hasSameType(T, Context.Char16Ty) || 7864 Context.hasSameType(T, Context.Char32Ty)) { 7865 if (++Param == FnDecl->param_end()) 7866 Valid = true; 7867 goto FinishedParams; 7868 } 7869 7870 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7871 const PointerType *PT = T->getAs<PointerType>(); 7872 if (!PT) 7873 goto FinishedParams; 7874 T = PT->getPointeeType(); 7875 if (!T.isConstQualified()) 7876 goto FinishedParams; 7877 T = T.getUnqualifiedType(); 7878 7879 // Move on to the second parameter; 7880 ++Param; 7881 7882 // If there is no second parameter, the first must be a const char * 7883 if (Param == FnDecl->param_end()) { 7884 if (Context.hasSameType(T, Context.CharTy)) 7885 Valid = true; 7886 goto FinishedParams; 7887 } 7888 7889 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7890 // are allowed as the first parameter to a two-parameter function 7891 if (!(Context.hasSameType(T, Context.CharTy) || 7892 Context.hasSameType(T, Context.WCharTy) || 7893 Context.hasSameType(T, Context.Char16Ty) || 7894 Context.hasSameType(T, Context.Char32Ty))) 7895 goto FinishedParams; 7896 7897 // The second and final parameter must be an std::size_t 7898 T = (*Param)->getType().getUnqualifiedType(); 7899 if (Context.hasSameType(T, Context.getSizeType()) && 7900 ++Param == FnDecl->param_end()) 7901 Valid = true; 7902 } 7903 7904 // FIXME: This diagnostic is absolutely terrible. 7905FinishedParams: 7906 if (!Valid) { 7907 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7908 << FnDecl->getDeclName(); 7909 return true; 7910 } 7911 7912 return false; 7913} 7914 7915/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7916/// linkage specification, including the language and (if present) 7917/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7918/// the location of the language string literal, which is provided 7919/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7920/// the '{' brace. Otherwise, this linkage specification does not 7921/// have any braces. 7922Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7923 SourceLocation LangLoc, 7924 llvm::StringRef Lang, 7925 SourceLocation LBraceLoc) { 7926 LinkageSpecDecl::LanguageIDs Language; 7927 if (Lang == "\"C\"") 7928 Language = LinkageSpecDecl::lang_c; 7929 else if (Lang == "\"C++\"") 7930 Language = LinkageSpecDecl::lang_cxx; 7931 else { 7932 Diag(LangLoc, diag::err_bad_language); 7933 return 0; 7934 } 7935 7936 // FIXME: Add all the various semantics of linkage specifications 7937 7938 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7939 ExternLoc, LangLoc, Language); 7940 CurContext->addDecl(D); 7941 PushDeclContext(S, D); 7942 return D; 7943} 7944 7945/// ActOnFinishLinkageSpecification - Complete the definition of 7946/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7947/// valid, it's the position of the closing '}' brace in a linkage 7948/// specification that uses braces. 7949Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7950 Decl *LinkageSpec, 7951 SourceLocation RBraceLoc) { 7952 if (LinkageSpec) { 7953 if (RBraceLoc.isValid()) { 7954 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7955 LSDecl->setRBraceLoc(RBraceLoc); 7956 } 7957 PopDeclContext(); 7958 } 7959 return LinkageSpec; 7960} 7961 7962/// \brief Perform semantic analysis for the variable declaration that 7963/// occurs within a C++ catch clause, returning the newly-created 7964/// variable. 7965VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7966 TypeSourceInfo *TInfo, 7967 SourceLocation StartLoc, 7968 SourceLocation Loc, 7969 IdentifierInfo *Name) { 7970 bool Invalid = false; 7971 QualType ExDeclType = TInfo->getType(); 7972 7973 // Arrays and functions decay. 7974 if (ExDeclType->isArrayType()) 7975 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7976 else if (ExDeclType->isFunctionType()) 7977 ExDeclType = Context.getPointerType(ExDeclType); 7978 7979 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7980 // The exception-declaration shall not denote a pointer or reference to an 7981 // incomplete type, other than [cv] void*. 7982 // N2844 forbids rvalue references. 7983 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7984 Diag(Loc, diag::err_catch_rvalue_ref); 7985 Invalid = true; 7986 } 7987 7988 // GCC allows catching pointers and references to incomplete types 7989 // as an extension; so do we, but we warn by default. 7990 7991 QualType BaseType = ExDeclType; 7992 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7993 unsigned DK = diag::err_catch_incomplete; 7994 bool IncompleteCatchIsInvalid = true; 7995 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7996 BaseType = Ptr->getPointeeType(); 7997 Mode = 1; 7998 DK = diag::ext_catch_incomplete_ptr; 7999 IncompleteCatchIsInvalid = false; 8000 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8001 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8002 BaseType = Ref->getPointeeType(); 8003 Mode = 2; 8004 DK = diag::ext_catch_incomplete_ref; 8005 IncompleteCatchIsInvalid = false; 8006 } 8007 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8008 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8009 IncompleteCatchIsInvalid) 8010 Invalid = true; 8011 8012 if (!Invalid && !ExDeclType->isDependentType() && 8013 RequireNonAbstractType(Loc, ExDeclType, 8014 diag::err_abstract_type_in_decl, 8015 AbstractVariableType)) 8016 Invalid = true; 8017 8018 // Only the non-fragile NeXT runtime currently supports C++ catches 8019 // of ObjC types, and no runtime supports catching ObjC types by value. 8020 if (!Invalid && getLangOptions().ObjC1) { 8021 QualType T = ExDeclType; 8022 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8023 T = RT->getPointeeType(); 8024 8025 if (T->isObjCObjectType()) { 8026 Diag(Loc, diag::err_objc_object_catch); 8027 Invalid = true; 8028 } else if (T->isObjCObjectPointerType()) { 8029 if (!getLangOptions().ObjCNonFragileABI) { 8030 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 8031 Invalid = true; 8032 } 8033 } 8034 } 8035 8036 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8037 ExDeclType, TInfo, SC_None, SC_None); 8038 ExDecl->setExceptionVariable(true); 8039 8040 if (!Invalid) { 8041 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8042 // C++ [except.handle]p16: 8043 // The object declared in an exception-declaration or, if the 8044 // exception-declaration does not specify a name, a temporary (12.2) is 8045 // copy-initialized (8.5) from the exception object. [...] 8046 // The object is destroyed when the handler exits, after the destruction 8047 // of any automatic objects initialized within the handler. 8048 // 8049 // We just pretend to initialize the object with itself, then make sure 8050 // it can be destroyed later. 8051 QualType initType = ExDeclType; 8052 8053 InitializedEntity entity = 8054 InitializedEntity::InitializeVariable(ExDecl); 8055 InitializationKind initKind = 8056 InitializationKind::CreateCopy(Loc, SourceLocation()); 8057 8058 Expr *opaqueValue = 8059 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8060 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8061 ExprResult result = sequence.Perform(*this, entity, initKind, 8062 MultiExprArg(&opaqueValue, 1)); 8063 if (result.isInvalid()) 8064 Invalid = true; 8065 else { 8066 // If the constructor used was non-trivial, set this as the 8067 // "initializer". 8068 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8069 if (!construct->getConstructor()->isTrivial()) { 8070 Expr *init = MaybeCreateExprWithCleanups(construct); 8071 ExDecl->setInit(init); 8072 } 8073 8074 // And make sure it's destructable. 8075 FinalizeVarWithDestructor(ExDecl, recordType); 8076 } 8077 } 8078 } 8079 8080 if (Invalid) 8081 ExDecl->setInvalidDecl(); 8082 8083 return ExDecl; 8084} 8085 8086/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8087/// handler. 8088Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8089 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8090 bool Invalid = D.isInvalidType(); 8091 8092 // Check for unexpanded parameter packs. 8093 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8094 UPPC_ExceptionType)) { 8095 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8096 D.getIdentifierLoc()); 8097 Invalid = true; 8098 } 8099 8100 IdentifierInfo *II = D.getIdentifier(); 8101 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8102 LookupOrdinaryName, 8103 ForRedeclaration)) { 8104 // The scope should be freshly made just for us. There is just no way 8105 // it contains any previous declaration. 8106 assert(!S->isDeclScope(PrevDecl)); 8107 if (PrevDecl->isTemplateParameter()) { 8108 // Maybe we will complain about the shadowed template parameter. 8109 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8110 } 8111 } 8112 8113 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8114 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8115 << D.getCXXScopeSpec().getRange(); 8116 Invalid = true; 8117 } 8118 8119 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8120 D.getSourceRange().getBegin(), 8121 D.getIdentifierLoc(), 8122 D.getIdentifier()); 8123 if (Invalid) 8124 ExDecl->setInvalidDecl(); 8125 8126 // Add the exception declaration into this scope. 8127 if (II) 8128 PushOnScopeChains(ExDecl, S); 8129 else 8130 CurContext->addDecl(ExDecl); 8131 8132 ProcessDeclAttributes(S, ExDecl, D); 8133 return ExDecl; 8134} 8135 8136Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8137 Expr *AssertExpr, 8138 Expr *AssertMessageExpr_, 8139 SourceLocation RParenLoc) { 8140 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8141 8142 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8143 llvm::APSInt Value(32); 8144 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8145 Diag(StaticAssertLoc, 8146 diag::err_static_assert_expression_is_not_constant) << 8147 AssertExpr->getSourceRange(); 8148 return 0; 8149 } 8150 8151 if (Value == 0) { 8152 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8153 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8154 } 8155 } 8156 8157 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8158 return 0; 8159 8160 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8161 AssertExpr, AssertMessage, RParenLoc); 8162 8163 CurContext->addDecl(Decl); 8164 return Decl; 8165} 8166 8167/// \brief Perform semantic analysis of the given friend type declaration. 8168/// 8169/// \returns A friend declaration that. 8170FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8171 TypeSourceInfo *TSInfo) { 8172 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8173 8174 QualType T = TSInfo->getType(); 8175 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8176 8177 if (!getLangOptions().CPlusPlus0x) { 8178 // C++03 [class.friend]p2: 8179 // An elaborated-type-specifier shall be used in a friend declaration 8180 // for a class.* 8181 // 8182 // * The class-key of the elaborated-type-specifier is required. 8183 if (!ActiveTemplateInstantiations.empty()) { 8184 // Do not complain about the form of friend template types during 8185 // template instantiation; we will already have complained when the 8186 // template was declared. 8187 } else if (!T->isElaboratedTypeSpecifier()) { 8188 // If we evaluated the type to a record type, suggest putting 8189 // a tag in front. 8190 if (const RecordType *RT = T->getAs<RecordType>()) { 8191 RecordDecl *RD = RT->getDecl(); 8192 8193 std::string InsertionText = std::string(" ") + RD->getKindName(); 8194 8195 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8196 << (unsigned) RD->getTagKind() 8197 << T 8198 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8199 InsertionText); 8200 } else { 8201 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8202 << T 8203 << SourceRange(FriendLoc, TypeRange.getEnd()); 8204 } 8205 } else if (T->getAs<EnumType>()) { 8206 Diag(FriendLoc, diag::ext_enum_friend) 8207 << T 8208 << SourceRange(FriendLoc, TypeRange.getEnd()); 8209 } 8210 } 8211 8212 // C++0x [class.friend]p3: 8213 // If the type specifier in a friend declaration designates a (possibly 8214 // cv-qualified) class type, that class is declared as a friend; otherwise, 8215 // the friend declaration is ignored. 8216 8217 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8218 // in [class.friend]p3 that we do not implement. 8219 8220 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8221} 8222 8223/// Handle a friend tag declaration where the scope specifier was 8224/// templated. 8225Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8226 unsigned TagSpec, SourceLocation TagLoc, 8227 CXXScopeSpec &SS, 8228 IdentifierInfo *Name, SourceLocation NameLoc, 8229 AttributeList *Attr, 8230 MultiTemplateParamsArg TempParamLists) { 8231 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8232 8233 bool isExplicitSpecialization = false; 8234 bool Invalid = false; 8235 8236 if (TemplateParameterList *TemplateParams 8237 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8238 TempParamLists.get(), 8239 TempParamLists.size(), 8240 /*friend*/ true, 8241 isExplicitSpecialization, 8242 Invalid)) { 8243 if (TemplateParams->size() > 0) { 8244 // This is a declaration of a class template. 8245 if (Invalid) 8246 return 0; 8247 8248 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8249 SS, Name, NameLoc, Attr, 8250 TemplateParams, AS_public, 8251 TempParamLists.size() - 1, 8252 (TemplateParameterList**) TempParamLists.release()).take(); 8253 } else { 8254 // The "template<>" header is extraneous. 8255 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8256 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8257 isExplicitSpecialization = true; 8258 } 8259 } 8260 8261 if (Invalid) return 0; 8262 8263 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8264 8265 bool isAllExplicitSpecializations = true; 8266 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8267 if (TempParamLists.get()[I]->size()) { 8268 isAllExplicitSpecializations = false; 8269 break; 8270 } 8271 } 8272 8273 // FIXME: don't ignore attributes. 8274 8275 // If it's explicit specializations all the way down, just forget 8276 // about the template header and build an appropriate non-templated 8277 // friend. TODO: for source fidelity, remember the headers. 8278 if (isAllExplicitSpecializations) { 8279 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8280 ElaboratedTypeKeyword Keyword 8281 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8282 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8283 *Name, NameLoc); 8284 if (T.isNull()) 8285 return 0; 8286 8287 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8288 if (isa<DependentNameType>(T)) { 8289 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8290 TL.setKeywordLoc(TagLoc); 8291 TL.setQualifierLoc(QualifierLoc); 8292 TL.setNameLoc(NameLoc); 8293 } else { 8294 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8295 TL.setKeywordLoc(TagLoc); 8296 TL.setQualifierLoc(QualifierLoc); 8297 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8298 } 8299 8300 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8301 TSI, FriendLoc); 8302 Friend->setAccess(AS_public); 8303 CurContext->addDecl(Friend); 8304 return Friend; 8305 } 8306 8307 // Handle the case of a templated-scope friend class. e.g. 8308 // template <class T> class A<T>::B; 8309 // FIXME: we don't support these right now. 8310 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8311 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8312 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8313 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8314 TL.setKeywordLoc(TagLoc); 8315 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8316 TL.setNameLoc(NameLoc); 8317 8318 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8319 TSI, FriendLoc); 8320 Friend->setAccess(AS_public); 8321 Friend->setUnsupportedFriend(true); 8322 CurContext->addDecl(Friend); 8323 return Friend; 8324} 8325 8326 8327/// Handle a friend type declaration. This works in tandem with 8328/// ActOnTag. 8329/// 8330/// Notes on friend class templates: 8331/// 8332/// We generally treat friend class declarations as if they were 8333/// declaring a class. So, for example, the elaborated type specifier 8334/// in a friend declaration is required to obey the restrictions of a 8335/// class-head (i.e. no typedefs in the scope chain), template 8336/// parameters are required to match up with simple template-ids, &c. 8337/// However, unlike when declaring a template specialization, it's 8338/// okay to refer to a template specialization without an empty 8339/// template parameter declaration, e.g. 8340/// friend class A<T>::B<unsigned>; 8341/// We permit this as a special case; if there are any template 8342/// parameters present at all, require proper matching, i.e. 8343/// template <> template <class T> friend class A<int>::B; 8344Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8345 MultiTemplateParamsArg TempParams) { 8346 SourceLocation Loc = DS.getSourceRange().getBegin(); 8347 8348 assert(DS.isFriendSpecified()); 8349 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8350 8351 // Try to convert the decl specifier to a type. This works for 8352 // friend templates because ActOnTag never produces a ClassTemplateDecl 8353 // for a TUK_Friend. 8354 Declarator TheDeclarator(DS, Declarator::MemberContext); 8355 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8356 QualType T = TSI->getType(); 8357 if (TheDeclarator.isInvalidType()) 8358 return 0; 8359 8360 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8361 return 0; 8362 8363 // This is definitely an error in C++98. It's probably meant to 8364 // be forbidden in C++0x, too, but the specification is just 8365 // poorly written. 8366 // 8367 // The problem is with declarations like the following: 8368 // template <T> friend A<T>::foo; 8369 // where deciding whether a class C is a friend or not now hinges 8370 // on whether there exists an instantiation of A that causes 8371 // 'foo' to equal C. There are restrictions on class-heads 8372 // (which we declare (by fiat) elaborated friend declarations to 8373 // be) that makes this tractable. 8374 // 8375 // FIXME: handle "template <> friend class A<T>;", which 8376 // is possibly well-formed? Who even knows? 8377 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8378 Diag(Loc, diag::err_tagless_friend_type_template) 8379 << DS.getSourceRange(); 8380 return 0; 8381 } 8382 8383 // C++98 [class.friend]p1: A friend of a class is a function 8384 // or class that is not a member of the class . . . 8385 // This is fixed in DR77, which just barely didn't make the C++03 8386 // deadline. It's also a very silly restriction that seriously 8387 // affects inner classes and which nobody else seems to implement; 8388 // thus we never diagnose it, not even in -pedantic. 8389 // 8390 // But note that we could warn about it: it's always useless to 8391 // friend one of your own members (it's not, however, worthless to 8392 // friend a member of an arbitrary specialization of your template). 8393 8394 Decl *D; 8395 if (unsigned NumTempParamLists = TempParams.size()) 8396 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8397 NumTempParamLists, 8398 TempParams.release(), 8399 TSI, 8400 DS.getFriendSpecLoc()); 8401 else 8402 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8403 8404 if (!D) 8405 return 0; 8406 8407 D->setAccess(AS_public); 8408 CurContext->addDecl(D); 8409 8410 return D; 8411} 8412 8413Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8414 MultiTemplateParamsArg TemplateParams) { 8415 const DeclSpec &DS = D.getDeclSpec(); 8416 8417 assert(DS.isFriendSpecified()); 8418 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8419 8420 SourceLocation Loc = D.getIdentifierLoc(); 8421 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8422 QualType T = TInfo->getType(); 8423 8424 // C++ [class.friend]p1 8425 // A friend of a class is a function or class.... 8426 // Note that this sees through typedefs, which is intended. 8427 // It *doesn't* see through dependent types, which is correct 8428 // according to [temp.arg.type]p3: 8429 // If a declaration acquires a function type through a 8430 // type dependent on a template-parameter and this causes 8431 // a declaration that does not use the syntactic form of a 8432 // function declarator to have a function type, the program 8433 // is ill-formed. 8434 if (!T->isFunctionType()) { 8435 Diag(Loc, diag::err_unexpected_friend); 8436 8437 // It might be worthwhile to try to recover by creating an 8438 // appropriate declaration. 8439 return 0; 8440 } 8441 8442 // C++ [namespace.memdef]p3 8443 // - If a friend declaration in a non-local class first declares a 8444 // class or function, the friend class or function is a member 8445 // of the innermost enclosing namespace. 8446 // - The name of the friend is not found by simple name lookup 8447 // until a matching declaration is provided in that namespace 8448 // scope (either before or after the class declaration granting 8449 // friendship). 8450 // - If a friend function is called, its name may be found by the 8451 // name lookup that considers functions from namespaces and 8452 // classes associated with the types of the function arguments. 8453 // - When looking for a prior declaration of a class or a function 8454 // declared as a friend, scopes outside the innermost enclosing 8455 // namespace scope are not considered. 8456 8457 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8458 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8459 DeclarationName Name = NameInfo.getName(); 8460 assert(Name); 8461 8462 // Check for unexpanded parameter packs. 8463 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8464 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8465 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8466 return 0; 8467 8468 // The context we found the declaration in, or in which we should 8469 // create the declaration. 8470 DeclContext *DC; 8471 Scope *DCScope = S; 8472 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8473 ForRedeclaration); 8474 8475 // FIXME: there are different rules in local classes 8476 8477 // There are four cases here. 8478 // - There's no scope specifier, in which case we just go to the 8479 // appropriate scope and look for a function or function template 8480 // there as appropriate. 8481 // Recover from invalid scope qualifiers as if they just weren't there. 8482 if (SS.isInvalid() || !SS.isSet()) { 8483 // C++0x [namespace.memdef]p3: 8484 // If the name in a friend declaration is neither qualified nor 8485 // a template-id and the declaration is a function or an 8486 // elaborated-type-specifier, the lookup to determine whether 8487 // the entity has been previously declared shall not consider 8488 // any scopes outside the innermost enclosing namespace. 8489 // C++0x [class.friend]p11: 8490 // If a friend declaration appears in a local class and the name 8491 // specified is an unqualified name, a prior declaration is 8492 // looked up without considering scopes that are outside the 8493 // innermost enclosing non-class scope. For a friend function 8494 // declaration, if there is no prior declaration, the program is 8495 // ill-formed. 8496 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8497 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8498 8499 // Find the appropriate context according to the above. 8500 DC = CurContext; 8501 while (true) { 8502 // Skip class contexts. If someone can cite chapter and verse 8503 // for this behavior, that would be nice --- it's what GCC and 8504 // EDG do, and it seems like a reasonable intent, but the spec 8505 // really only says that checks for unqualified existing 8506 // declarations should stop at the nearest enclosing namespace, 8507 // not that they should only consider the nearest enclosing 8508 // namespace. 8509 while (DC->isRecord()) 8510 DC = DC->getParent(); 8511 8512 LookupQualifiedName(Previous, DC); 8513 8514 // TODO: decide what we think about using declarations. 8515 if (isLocal || !Previous.empty()) 8516 break; 8517 8518 if (isTemplateId) { 8519 if (isa<TranslationUnitDecl>(DC)) break; 8520 } else { 8521 if (DC->isFileContext()) break; 8522 } 8523 DC = DC->getParent(); 8524 } 8525 8526 // C++ [class.friend]p1: A friend of a class is a function or 8527 // class that is not a member of the class . . . 8528 // C++0x changes this for both friend types and functions. 8529 // Most C++ 98 compilers do seem to give an error here, so 8530 // we do, too. 8531 if (!Previous.empty() && DC->Equals(CurContext) 8532 && !getLangOptions().CPlusPlus0x) 8533 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8534 8535 DCScope = getScopeForDeclContext(S, DC); 8536 8537 // - There's a non-dependent scope specifier, in which case we 8538 // compute it and do a previous lookup there for a function 8539 // or function template. 8540 } else if (!SS.getScopeRep()->isDependent()) { 8541 DC = computeDeclContext(SS); 8542 if (!DC) return 0; 8543 8544 if (RequireCompleteDeclContext(SS, DC)) return 0; 8545 8546 LookupQualifiedName(Previous, DC); 8547 8548 // Ignore things found implicitly in the wrong scope. 8549 // TODO: better diagnostics for this case. Suggesting the right 8550 // qualified scope would be nice... 8551 LookupResult::Filter F = Previous.makeFilter(); 8552 while (F.hasNext()) { 8553 NamedDecl *D = F.next(); 8554 if (!DC->InEnclosingNamespaceSetOf( 8555 D->getDeclContext()->getRedeclContext())) 8556 F.erase(); 8557 } 8558 F.done(); 8559 8560 if (Previous.empty()) { 8561 D.setInvalidType(); 8562 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8563 return 0; 8564 } 8565 8566 // C++ [class.friend]p1: A friend of a class is a function or 8567 // class that is not a member of the class . . . 8568 if (DC->Equals(CurContext)) 8569 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8570 8571 // - There's a scope specifier that does not match any template 8572 // parameter lists, in which case we use some arbitrary context, 8573 // create a method or method template, and wait for instantiation. 8574 // - There's a scope specifier that does match some template 8575 // parameter lists, which we don't handle right now. 8576 } else { 8577 DC = CurContext; 8578 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8579 } 8580 8581 if (!DC->isRecord()) { 8582 // This implies that it has to be an operator or function. 8583 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8584 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8585 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8586 Diag(Loc, diag::err_introducing_special_friend) << 8587 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8588 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8589 return 0; 8590 } 8591 } 8592 8593 bool Redeclaration = false; 8594 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8595 move(TemplateParams), 8596 IsDefinition, 8597 Redeclaration); 8598 if (!ND) return 0; 8599 8600 assert(ND->getDeclContext() == DC); 8601 assert(ND->getLexicalDeclContext() == CurContext); 8602 8603 // Add the function declaration to the appropriate lookup tables, 8604 // adjusting the redeclarations list as necessary. We don't 8605 // want to do this yet if the friending class is dependent. 8606 // 8607 // Also update the scope-based lookup if the target context's 8608 // lookup context is in lexical scope. 8609 if (!CurContext->isDependentContext()) { 8610 DC = DC->getRedeclContext(); 8611 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8612 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8613 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8614 } 8615 8616 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8617 D.getIdentifierLoc(), ND, 8618 DS.getFriendSpecLoc()); 8619 FrD->setAccess(AS_public); 8620 CurContext->addDecl(FrD); 8621 8622 if (ND->isInvalidDecl()) 8623 FrD->setInvalidDecl(); 8624 else { 8625 FunctionDecl *FD; 8626 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8627 FD = FTD->getTemplatedDecl(); 8628 else 8629 FD = cast<FunctionDecl>(ND); 8630 8631 // Mark templated-scope function declarations as unsupported. 8632 if (FD->getNumTemplateParameterLists()) 8633 FrD->setUnsupportedFriend(true); 8634 } 8635 8636 return ND; 8637} 8638 8639void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8640 AdjustDeclIfTemplate(Dcl); 8641 8642 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8643 if (!Fn) { 8644 Diag(DelLoc, diag::err_deleted_non_function); 8645 return; 8646 } 8647 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8648 Diag(DelLoc, diag::err_deleted_decl_not_first); 8649 Diag(Prev->getLocation(), diag::note_previous_declaration); 8650 // If the declaration wasn't the first, we delete the function anyway for 8651 // recovery. 8652 } 8653 Fn->setDeletedAsWritten(); 8654} 8655 8656void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8657 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8658 8659 if (MD) { 8660 if (MD->getParent()->isDependentType()) { 8661 MD->setDefaulted(); 8662 MD->setExplicitlyDefaulted(); 8663 return; 8664 } 8665 8666 CXXSpecialMember Member = getSpecialMember(MD); 8667 if (Member == CXXInvalid) { 8668 Diag(DefaultLoc, diag::err_default_special_members); 8669 return; 8670 } 8671 8672 MD->setDefaulted(); 8673 MD->setExplicitlyDefaulted(); 8674 8675 // If this definition appears within the record, do the checking when 8676 // the record is complete. 8677 const FunctionDecl *Primary = MD; 8678 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8679 // Find the uninstantiated declaration that actually had the '= default' 8680 // on it. 8681 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8682 8683 if (Primary == Primary->getCanonicalDecl()) 8684 return; 8685 8686 switch (Member) { 8687 case CXXDefaultConstructor: { 8688 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8689 CheckExplicitlyDefaultedDefaultConstructor(CD); 8690 if (!CD->isInvalidDecl()) 8691 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8692 break; 8693 } 8694 8695 case CXXCopyConstructor: { 8696 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8697 CheckExplicitlyDefaultedCopyConstructor(CD); 8698 if (!CD->isInvalidDecl()) 8699 DefineImplicitCopyConstructor(DefaultLoc, CD); 8700 break; 8701 } 8702 8703 case CXXCopyAssignment: { 8704 CheckExplicitlyDefaultedCopyAssignment(MD); 8705 if (!MD->isInvalidDecl()) 8706 DefineImplicitCopyAssignment(DefaultLoc, MD); 8707 break; 8708 } 8709 8710 case CXXDestructor: { 8711 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8712 CheckExplicitlyDefaultedDestructor(DD); 8713 if (!DD->isInvalidDecl()) 8714 DefineImplicitDestructor(DefaultLoc, DD); 8715 break; 8716 } 8717 8718 default: 8719 // FIXME: Do the rest once we have move functions 8720 break; 8721 } 8722 } else { 8723 Diag(DefaultLoc, diag::err_default_special_members); 8724 } 8725} 8726 8727static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8728 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8729 Stmt *SubStmt = *CI; 8730 if (!SubStmt) 8731 continue; 8732 if (isa<ReturnStmt>(SubStmt)) 8733 Self.Diag(SubStmt->getSourceRange().getBegin(), 8734 diag::err_return_in_constructor_handler); 8735 if (!isa<Expr>(SubStmt)) 8736 SearchForReturnInStmt(Self, SubStmt); 8737 } 8738} 8739 8740void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8741 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8742 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8743 SearchForReturnInStmt(*this, Handler); 8744 } 8745} 8746 8747bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8748 const CXXMethodDecl *Old) { 8749 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8750 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8751 8752 if (Context.hasSameType(NewTy, OldTy) || 8753 NewTy->isDependentType() || OldTy->isDependentType()) 8754 return false; 8755 8756 // Check if the return types are covariant 8757 QualType NewClassTy, OldClassTy; 8758 8759 /// Both types must be pointers or references to classes. 8760 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8761 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8762 NewClassTy = NewPT->getPointeeType(); 8763 OldClassTy = OldPT->getPointeeType(); 8764 } 8765 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8766 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8767 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8768 NewClassTy = NewRT->getPointeeType(); 8769 OldClassTy = OldRT->getPointeeType(); 8770 } 8771 } 8772 } 8773 8774 // The return types aren't either both pointers or references to a class type. 8775 if (NewClassTy.isNull()) { 8776 Diag(New->getLocation(), 8777 diag::err_different_return_type_for_overriding_virtual_function) 8778 << New->getDeclName() << NewTy << OldTy; 8779 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8780 8781 return true; 8782 } 8783 8784 // C++ [class.virtual]p6: 8785 // If the return type of D::f differs from the return type of B::f, the 8786 // class type in the return type of D::f shall be complete at the point of 8787 // declaration of D::f or shall be the class type D. 8788 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8789 if (!RT->isBeingDefined() && 8790 RequireCompleteType(New->getLocation(), NewClassTy, 8791 PDiag(diag::err_covariant_return_incomplete) 8792 << New->getDeclName())) 8793 return true; 8794 } 8795 8796 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8797 // Check if the new class derives from the old class. 8798 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8799 Diag(New->getLocation(), 8800 diag::err_covariant_return_not_derived) 8801 << New->getDeclName() << NewTy << OldTy; 8802 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8803 return true; 8804 } 8805 8806 // Check if we the conversion from derived to base is valid. 8807 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8808 diag::err_covariant_return_inaccessible_base, 8809 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8810 // FIXME: Should this point to the return type? 8811 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8812 // FIXME: this note won't trigger for delayed access control 8813 // diagnostics, and it's impossible to get an undelayed error 8814 // here from access control during the original parse because 8815 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8816 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8817 return true; 8818 } 8819 } 8820 8821 // The qualifiers of the return types must be the same. 8822 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8823 Diag(New->getLocation(), 8824 diag::err_covariant_return_type_different_qualifications) 8825 << New->getDeclName() << NewTy << OldTy; 8826 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8827 return true; 8828 }; 8829 8830 8831 // The new class type must have the same or less qualifiers as the old type. 8832 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8833 Diag(New->getLocation(), 8834 diag::err_covariant_return_type_class_type_more_qualified) 8835 << New->getDeclName() << NewTy << OldTy; 8836 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8837 return true; 8838 }; 8839 8840 return false; 8841} 8842 8843/// \brief Mark the given method pure. 8844/// 8845/// \param Method the method to be marked pure. 8846/// 8847/// \param InitRange the source range that covers the "0" initializer. 8848bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8849 SourceLocation EndLoc = InitRange.getEnd(); 8850 if (EndLoc.isValid()) 8851 Method->setRangeEnd(EndLoc); 8852 8853 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8854 Method->setPure(); 8855 return false; 8856 } 8857 8858 if (!Method->isInvalidDecl()) 8859 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8860 << Method->getDeclName() << InitRange; 8861 return true; 8862} 8863 8864/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8865/// an initializer for the out-of-line declaration 'Dcl'. The scope 8866/// is a fresh scope pushed for just this purpose. 8867/// 8868/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8869/// static data member of class X, names should be looked up in the scope of 8870/// class X. 8871void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8872 // If there is no declaration, there was an error parsing it. 8873 if (D == 0 || D->isInvalidDecl()) return; 8874 8875 // We should only get called for declarations with scope specifiers, like: 8876 // int foo::bar; 8877 assert(D->isOutOfLine()); 8878 EnterDeclaratorContext(S, D->getDeclContext()); 8879} 8880 8881/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8882/// initializer for the out-of-line declaration 'D'. 8883void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8884 // If there is no declaration, there was an error parsing it. 8885 if (D == 0 || D->isInvalidDecl()) return; 8886 8887 assert(D->isOutOfLine()); 8888 ExitDeclaratorContext(S); 8889} 8890 8891/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8892/// C++ if/switch/while/for statement. 8893/// e.g: "if (int x = f()) {...}" 8894DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8895 // C++ 6.4p2: 8896 // The declarator shall not specify a function or an array. 8897 // The type-specifier-seq shall not contain typedef and shall not declare a 8898 // new class or enumeration. 8899 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8900 "Parser allowed 'typedef' as storage class of condition decl."); 8901 8902 TagDecl *OwnedTag = 0; 8903 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8904 QualType Ty = TInfo->getType(); 8905 8906 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8907 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8908 // would be created and CXXConditionDeclExpr wants a VarDecl. 8909 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8910 << D.getSourceRange(); 8911 return DeclResult(); 8912 } else if (OwnedTag && OwnedTag->isDefinition()) { 8913 // The type-specifier-seq shall not declare a new class or enumeration. 8914 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8915 } 8916 8917 Decl *Dcl = ActOnDeclarator(S, D); 8918 if (!Dcl) 8919 return DeclResult(); 8920 8921 return Dcl; 8922} 8923 8924void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8925 bool DefinitionRequired) { 8926 // Ignore any vtable uses in unevaluated operands or for classes that do 8927 // not have a vtable. 8928 if (!Class->isDynamicClass() || Class->isDependentContext() || 8929 CurContext->isDependentContext() || 8930 ExprEvalContexts.back().Context == Unevaluated) 8931 return; 8932 8933 // Try to insert this class into the map. 8934 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8935 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8936 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8937 if (!Pos.second) { 8938 // If we already had an entry, check to see if we are promoting this vtable 8939 // to required a definition. If so, we need to reappend to the VTableUses 8940 // list, since we may have already processed the first entry. 8941 if (DefinitionRequired && !Pos.first->second) { 8942 Pos.first->second = true; 8943 } else { 8944 // Otherwise, we can early exit. 8945 return; 8946 } 8947 } 8948 8949 // Local classes need to have their virtual members marked 8950 // immediately. For all other classes, we mark their virtual members 8951 // at the end of the translation unit. 8952 if (Class->isLocalClass()) 8953 MarkVirtualMembersReferenced(Loc, Class); 8954 else 8955 VTableUses.push_back(std::make_pair(Class, Loc)); 8956} 8957 8958bool Sema::DefineUsedVTables() { 8959 if (VTableUses.empty()) 8960 return false; 8961 8962 // Note: The VTableUses vector could grow as a result of marking 8963 // the members of a class as "used", so we check the size each 8964 // time through the loop and prefer indices (with are stable) to 8965 // iterators (which are not). 8966 bool DefinedAnything = false; 8967 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8968 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8969 if (!Class) 8970 continue; 8971 8972 SourceLocation Loc = VTableUses[I].second; 8973 8974 // If this class has a key function, but that key function is 8975 // defined in another translation unit, we don't need to emit the 8976 // vtable even though we're using it. 8977 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8978 if (KeyFunction && !KeyFunction->hasBody()) { 8979 switch (KeyFunction->getTemplateSpecializationKind()) { 8980 case TSK_Undeclared: 8981 case TSK_ExplicitSpecialization: 8982 case TSK_ExplicitInstantiationDeclaration: 8983 // The key function is in another translation unit. 8984 continue; 8985 8986 case TSK_ExplicitInstantiationDefinition: 8987 case TSK_ImplicitInstantiation: 8988 // We will be instantiating the key function. 8989 break; 8990 } 8991 } else if (!KeyFunction) { 8992 // If we have a class with no key function that is the subject 8993 // of an explicit instantiation declaration, suppress the 8994 // vtable; it will live with the explicit instantiation 8995 // definition. 8996 bool IsExplicitInstantiationDeclaration 8997 = Class->getTemplateSpecializationKind() 8998 == TSK_ExplicitInstantiationDeclaration; 8999 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9000 REnd = Class->redecls_end(); 9001 R != REnd; ++R) { 9002 TemplateSpecializationKind TSK 9003 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9004 if (TSK == TSK_ExplicitInstantiationDeclaration) 9005 IsExplicitInstantiationDeclaration = true; 9006 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9007 IsExplicitInstantiationDeclaration = false; 9008 break; 9009 } 9010 } 9011 9012 if (IsExplicitInstantiationDeclaration) 9013 continue; 9014 } 9015 9016 // Mark all of the virtual members of this class as referenced, so 9017 // that we can build a vtable. Then, tell the AST consumer that a 9018 // vtable for this class is required. 9019 DefinedAnything = true; 9020 MarkVirtualMembersReferenced(Loc, Class); 9021 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9022 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9023 9024 // Optionally warn if we're emitting a weak vtable. 9025 if (Class->getLinkage() == ExternalLinkage && 9026 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9027 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9028 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9029 } 9030 } 9031 VTableUses.clear(); 9032 9033 return DefinedAnything; 9034} 9035 9036void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9037 const CXXRecordDecl *RD) { 9038 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9039 e = RD->method_end(); i != e; ++i) { 9040 CXXMethodDecl *MD = *i; 9041 9042 // C++ [basic.def.odr]p2: 9043 // [...] A virtual member function is used if it is not pure. [...] 9044 if (MD->isVirtual() && !MD->isPure()) 9045 MarkDeclarationReferenced(Loc, MD); 9046 } 9047 9048 // Only classes that have virtual bases need a VTT. 9049 if (RD->getNumVBases() == 0) 9050 return; 9051 9052 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9053 e = RD->bases_end(); i != e; ++i) { 9054 const CXXRecordDecl *Base = 9055 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9056 if (Base->getNumVBases() == 0) 9057 continue; 9058 MarkVirtualMembersReferenced(Loc, Base); 9059 } 9060} 9061 9062/// SetIvarInitializers - This routine builds initialization ASTs for the 9063/// Objective-C implementation whose ivars need be initialized. 9064void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9065 if (!getLangOptions().CPlusPlus) 9066 return; 9067 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9068 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9069 CollectIvarsToConstructOrDestruct(OID, ivars); 9070 if (ivars.empty()) 9071 return; 9072 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9073 for (unsigned i = 0; i < ivars.size(); i++) { 9074 FieldDecl *Field = ivars[i]; 9075 if (Field->isInvalidDecl()) 9076 continue; 9077 9078 CXXCtorInitializer *Member; 9079 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9080 InitializationKind InitKind = 9081 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9082 9083 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9084 ExprResult MemberInit = 9085 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9086 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9087 // Note, MemberInit could actually come back empty if no initialization 9088 // is required (e.g., because it would call a trivial default constructor) 9089 if (!MemberInit.get() || MemberInit.isInvalid()) 9090 continue; 9091 9092 Member = 9093 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9094 SourceLocation(), 9095 MemberInit.takeAs<Expr>(), 9096 SourceLocation()); 9097 AllToInit.push_back(Member); 9098 9099 // Be sure that the destructor is accessible and is marked as referenced. 9100 if (const RecordType *RecordTy 9101 = Context.getBaseElementType(Field->getType()) 9102 ->getAs<RecordType>()) { 9103 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9104 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9105 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9106 CheckDestructorAccess(Field->getLocation(), Destructor, 9107 PDiag(diag::err_access_dtor_ivar) 9108 << Context.getBaseElementType(Field->getType())); 9109 } 9110 } 9111 } 9112 ObjCImplementation->setIvarInitializers(Context, 9113 AllToInit.data(), AllToInit.size()); 9114 } 9115} 9116 9117static 9118void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9119 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9120 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9121 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9122 Sema &S) { 9123 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9124 CE = Current.end(); 9125 if (Ctor->isInvalidDecl()) 9126 return; 9127 9128 const FunctionDecl *FNTarget = 0; 9129 CXXConstructorDecl *Target; 9130 9131 // We ignore the result here since if we don't have a body, Target will be 9132 // null below. 9133 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9134 Target 9135= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9136 9137 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9138 // Avoid dereferencing a null pointer here. 9139 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9140 9141 if (!Current.insert(Canonical)) 9142 return; 9143 9144 // We know that beyond here, we aren't chaining into a cycle. 9145 if (!Target || !Target->isDelegatingConstructor() || 9146 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9147 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9148 Valid.insert(*CI); 9149 Current.clear(); 9150 // We've hit a cycle. 9151 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9152 Current.count(TCanonical)) { 9153 // If we haven't diagnosed this cycle yet, do so now. 9154 if (!Invalid.count(TCanonical)) { 9155 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9156 diag::warn_delegating_ctor_cycle) 9157 << Ctor; 9158 9159 // Don't add a note for a function delegating directo to itself. 9160 if (TCanonical != Canonical) 9161 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9162 9163 CXXConstructorDecl *C = Target; 9164 while (C->getCanonicalDecl() != Canonical) { 9165 (void)C->getTargetConstructor()->hasBody(FNTarget); 9166 assert(FNTarget && "Ctor cycle through bodiless function"); 9167 9168 C 9169 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9170 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9171 } 9172 } 9173 9174 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9175 Invalid.insert(*CI); 9176 Current.clear(); 9177 } else { 9178 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9179 } 9180} 9181 9182 9183void Sema::CheckDelegatingCtorCycles() { 9184 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9185 9186 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9187 CE = Current.end(); 9188 9189 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9190 I = DelegatingCtorDecls.begin(), 9191 E = DelegatingCtorDecls.end(); 9192 I != E; ++I) { 9193 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9194 } 9195 9196 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9197 (*CI)->setInvalidDecl(); 9198} 9199