SemaDeclCXX.cpp revision 30de05c228d5d38dbfdeeeb598cb960646bf998a
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // If this function has a basic noexcept, it doesn't affect the outcome. 133 if (EST == EST_BasicNoexcept) 134 return; 135 136 // If we have a throw-all spec at this point, ignore the function. 137 if (ComputedEST == EST_None) 138 return; 139 140 // If we're still at noexcept(true) and there's a nothrow() callee, 141 // change to that specification. 142 if (EST == EST_DynamicNone) { 143 if (ComputedEST == EST_BasicNoexcept) 144 ComputedEST = EST_DynamicNone; 145 return; 146 } 147 148 // Check out noexcept specs. 149 if (EST == EST_ComputedNoexcept) { 150 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 151 assert(NR != FunctionProtoType::NR_NoNoexcept && 152 "Must have noexcept result for EST_ComputedNoexcept."); 153 assert(NR != FunctionProtoType::NR_Dependent && 154 "Should not generate implicit declarations for dependent cases, " 155 "and don't know how to handle them anyway."); 156 157 // noexcept(false) -> no spec on the new function 158 if (NR == FunctionProtoType::NR_Throw) { 159 ClearExceptions(); 160 ComputedEST = EST_None; 161 } 162 // noexcept(true) won't change anything either. 163 return; 164 } 165 166 assert(EST == EST_Dynamic && "EST case not considered earlier."); 167 assert(ComputedEST != EST_None && 168 "Shouldn't collect exceptions when throw-all is guaranteed."); 169 ComputedEST = EST_Dynamic; 170 // Record the exceptions in this function's exception specification. 171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 172 EEnd = Proto->exception_end(); 173 E != EEnd; ++E) 174 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 175 Exceptions.push_back(*E); 176} 177 178bool 179Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 180 SourceLocation EqualLoc) { 181 if (RequireCompleteType(Param->getLocation(), Param->getType(), 182 diag::err_typecheck_decl_incomplete_type)) { 183 Param->setInvalidDecl(); 184 return true; 185 } 186 187 // C++ [dcl.fct.default]p5 188 // A default argument expression is implicitly converted (clause 189 // 4) to the parameter type. The default argument expression has 190 // the same semantic constraints as the initializer expression in 191 // a declaration of a variable of the parameter type, using the 192 // copy-initialization semantics (8.5). 193 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 194 Param); 195 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 196 EqualLoc); 197 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 198 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 199 MultiExprArg(*this, &Arg, 1)); 200 if (Result.isInvalid()) 201 return true; 202 Arg = Result.takeAs<Expr>(); 203 204 CheckImplicitConversions(Arg, EqualLoc); 205 Arg = MaybeCreateExprWithCleanups(Arg); 206 207 // Okay: add the default argument to the parameter 208 Param->setDefaultArg(Arg); 209 210 // We have already instantiated this parameter; provide each of the 211 // instantiations with the uninstantiated default argument. 212 UnparsedDefaultArgInstantiationsMap::iterator InstPos 213 = UnparsedDefaultArgInstantiations.find(Param); 214 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 215 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 216 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 217 218 // We're done tracking this parameter's instantiations. 219 UnparsedDefaultArgInstantiations.erase(InstPos); 220 } 221 222 return false; 223} 224 225/// ActOnParamDefaultArgument - Check whether the default argument 226/// provided for a function parameter is well-formed. If so, attach it 227/// to the parameter declaration. 228void 229Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 230 Expr *DefaultArg) { 231 if (!param || !DefaultArg) 232 return; 233 234 ParmVarDecl *Param = cast<ParmVarDecl>(param); 235 UnparsedDefaultArgLocs.erase(Param); 236 237 // Default arguments are only permitted in C++ 238 if (!getLangOptions().CPlusPlus) { 239 Diag(EqualLoc, diag::err_param_default_argument) 240 << DefaultArg->getSourceRange(); 241 Param->setInvalidDecl(); 242 return; 243 } 244 245 // Check for unexpanded parameter packs. 246 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 247 Param->setInvalidDecl(); 248 return; 249 } 250 251 // Check that the default argument is well-formed 252 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 253 if (DefaultArgChecker.Visit(DefaultArg)) { 254 Param->setInvalidDecl(); 255 return; 256 } 257 258 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 259} 260 261/// ActOnParamUnparsedDefaultArgument - We've seen a default 262/// argument for a function parameter, but we can't parse it yet 263/// because we're inside a class definition. Note that this default 264/// argument will be parsed later. 265void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 266 SourceLocation EqualLoc, 267 SourceLocation ArgLoc) { 268 if (!param) 269 return; 270 271 ParmVarDecl *Param = cast<ParmVarDecl>(param); 272 if (Param) 273 Param->setUnparsedDefaultArg(); 274 275 UnparsedDefaultArgLocs[Param] = ArgLoc; 276} 277 278/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 279/// the default argument for the parameter param failed. 280void Sema::ActOnParamDefaultArgumentError(Decl *param) { 281 if (!param) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 286 Param->setInvalidDecl(); 287 288 UnparsedDefaultArgLocs.erase(Param); 289} 290 291/// CheckExtraCXXDefaultArguments - Check for any extra default 292/// arguments in the declarator, which is not a function declaration 293/// or definition and therefore is not permitted to have default 294/// arguments. This routine should be invoked for every declarator 295/// that is not a function declaration or definition. 296void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 297 // C++ [dcl.fct.default]p3 298 // A default argument expression shall be specified only in the 299 // parameter-declaration-clause of a function declaration or in a 300 // template-parameter (14.1). It shall not be specified for a 301 // parameter pack. If it is specified in a 302 // parameter-declaration-clause, it shall not occur within a 303 // declarator or abstract-declarator of a parameter-declaration. 304 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 305 DeclaratorChunk &chunk = D.getTypeObject(i); 306 if (chunk.Kind == DeclaratorChunk::Function) { 307 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 308 ParmVarDecl *Param = 309 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 310 if (Param->hasUnparsedDefaultArg()) { 311 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 312 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 313 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 314 delete Toks; 315 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 316 } else if (Param->getDefaultArg()) { 317 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 318 << Param->getDefaultArg()->getSourceRange(); 319 Param->setDefaultArg(0); 320 } 321 } 322 } 323 } 324} 325 326// MergeCXXFunctionDecl - Merge two declarations of the same C++ 327// function, once we already know that they have the same 328// type. Subroutine of MergeFunctionDecl. Returns true if there was an 329// error, false otherwise. 330bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 331 bool Invalid = false; 332 333 // C++ [dcl.fct.default]p4: 334 // For non-template functions, default arguments can be added in 335 // later declarations of a function in the same 336 // scope. Declarations in different scopes have completely 337 // distinct sets of default arguments. That is, declarations in 338 // inner scopes do not acquire default arguments from 339 // declarations in outer scopes, and vice versa. In a given 340 // function declaration, all parameters subsequent to a 341 // parameter with a default argument shall have default 342 // arguments supplied in this or previous declarations. A 343 // default argument shall not be redefined by a later 344 // declaration (not even to the same value). 345 // 346 // C++ [dcl.fct.default]p6: 347 // Except for member functions of class templates, the default arguments 348 // in a member function definition that appears outside of the class 349 // definition are added to the set of default arguments provided by the 350 // member function declaration in the class definition. 351 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 352 ParmVarDecl *OldParam = Old->getParamDecl(p); 353 ParmVarDecl *NewParam = New->getParamDecl(p); 354 355 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 356 357 unsigned DiagDefaultParamID = 358 diag::err_param_default_argument_redefinition; 359 360 // MSVC accepts that default parameters be redefined for member functions 361 // of template class. The new default parameter's value is ignored. 362 Invalid = true; 363 if (getLangOptions().Microsoft) { 364 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 365 if (MD && MD->getParent()->getDescribedClassTemplate()) { 366 // Merge the old default argument into the new parameter. 367 NewParam->setHasInheritedDefaultArg(); 368 if (OldParam->hasUninstantiatedDefaultArg()) 369 NewParam->setUninstantiatedDefaultArg( 370 OldParam->getUninstantiatedDefaultArg()); 371 else 372 NewParam->setDefaultArg(OldParam->getInit()); 373 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 374 Invalid = false; 375 } 376 } 377 378 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 379 // hint here. Alternatively, we could walk the type-source information 380 // for NewParam to find the last source location in the type... but it 381 // isn't worth the effort right now. This is the kind of test case that 382 // is hard to get right: 383 // int f(int); 384 // void g(int (*fp)(int) = f); 385 // void g(int (*fp)(int) = &f); 386 Diag(NewParam->getLocation(), DiagDefaultParamID) 387 << NewParam->getDefaultArgRange(); 388 389 // Look for the function declaration where the default argument was 390 // actually written, which may be a declaration prior to Old. 391 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 392 Older; Older = Older->getPreviousDeclaration()) { 393 if (!Older->getParamDecl(p)->hasDefaultArg()) 394 break; 395 396 OldParam = Older->getParamDecl(p); 397 } 398 399 Diag(OldParam->getLocation(), diag::note_previous_definition) 400 << OldParam->getDefaultArgRange(); 401 } else if (OldParam->hasDefaultArg()) { 402 // Merge the old default argument into the new parameter. 403 // It's important to use getInit() here; getDefaultArg() 404 // strips off any top-level ExprWithCleanups. 405 NewParam->setHasInheritedDefaultArg(); 406 if (OldParam->hasUninstantiatedDefaultArg()) 407 NewParam->setUninstantiatedDefaultArg( 408 OldParam->getUninstantiatedDefaultArg()); 409 else 410 NewParam->setDefaultArg(OldParam->getInit()); 411 } else if (NewParam->hasDefaultArg()) { 412 if (New->getDescribedFunctionTemplate()) { 413 // Paragraph 4, quoted above, only applies to non-template functions. 414 Diag(NewParam->getLocation(), 415 diag::err_param_default_argument_template_redecl) 416 << NewParam->getDefaultArgRange(); 417 Diag(Old->getLocation(), diag::note_template_prev_declaration) 418 << false; 419 } else if (New->getTemplateSpecializationKind() 420 != TSK_ImplicitInstantiation && 421 New->getTemplateSpecializationKind() != TSK_Undeclared) { 422 // C++ [temp.expr.spec]p21: 423 // Default function arguments shall not be specified in a declaration 424 // or a definition for one of the following explicit specializations: 425 // - the explicit specialization of a function template; 426 // - the explicit specialization of a member function template; 427 // - the explicit specialization of a member function of a class 428 // template where the class template specialization to which the 429 // member function specialization belongs is implicitly 430 // instantiated. 431 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 432 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 433 << New->getDeclName() 434 << NewParam->getDefaultArgRange(); 435 } else if (New->getDeclContext()->isDependentContext()) { 436 // C++ [dcl.fct.default]p6 (DR217): 437 // Default arguments for a member function of a class template shall 438 // be specified on the initial declaration of the member function 439 // within the class template. 440 // 441 // Reading the tea leaves a bit in DR217 and its reference to DR205 442 // leads me to the conclusion that one cannot add default function 443 // arguments for an out-of-line definition of a member function of a 444 // dependent type. 445 int WhichKind = 2; 446 if (CXXRecordDecl *Record 447 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 448 if (Record->getDescribedClassTemplate()) 449 WhichKind = 0; 450 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 451 WhichKind = 1; 452 else 453 WhichKind = 2; 454 } 455 456 Diag(NewParam->getLocation(), 457 diag::err_param_default_argument_member_template_redecl) 458 << WhichKind 459 << NewParam->getDefaultArgRange(); 460 } 461 } 462 } 463 464 if (CheckEquivalentExceptionSpec(Old, New)) 465 Invalid = true; 466 467 return Invalid; 468} 469 470/// \brief Merge the exception specifications of two variable declarations. 471/// 472/// This is called when there's a redeclaration of a VarDecl. The function 473/// checks if the redeclaration might have an exception specification and 474/// validates compatibility and merges the specs if necessary. 475void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 476 // Shortcut if exceptions are disabled. 477 if (!getLangOptions().CXXExceptions) 478 return; 479 480 assert(Context.hasSameType(New->getType(), Old->getType()) && 481 "Should only be called if types are otherwise the same."); 482 483 QualType NewType = New->getType(); 484 QualType OldType = Old->getType(); 485 486 // We're only interested in pointers and references to functions, as well 487 // as pointers to member functions. 488 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 489 NewType = R->getPointeeType(); 490 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 491 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 492 NewType = P->getPointeeType(); 493 OldType = OldType->getAs<PointerType>()->getPointeeType(); 494 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 495 NewType = M->getPointeeType(); 496 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 497 } 498 499 if (!NewType->isFunctionProtoType()) 500 return; 501 502 // There's lots of special cases for functions. For function pointers, system 503 // libraries are hopefully not as broken so that we don't need these 504 // workarounds. 505 if (CheckEquivalentExceptionSpec( 506 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 507 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 508 New->setInvalidDecl(); 509 } 510} 511 512/// CheckCXXDefaultArguments - Verify that the default arguments for a 513/// function declaration are well-formed according to C++ 514/// [dcl.fct.default]. 515void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 516 unsigned NumParams = FD->getNumParams(); 517 unsigned p; 518 519 // Find first parameter with a default argument 520 for (p = 0; p < NumParams; ++p) { 521 ParmVarDecl *Param = FD->getParamDecl(p); 522 if (Param->hasDefaultArg()) 523 break; 524 } 525 526 // C++ [dcl.fct.default]p4: 527 // In a given function declaration, all parameters 528 // subsequent to a parameter with a default argument shall 529 // have default arguments supplied in this or previous 530 // declarations. A default argument shall not be redefined 531 // by a later declaration (not even to the same value). 532 unsigned LastMissingDefaultArg = 0; 533 for (; p < NumParams; ++p) { 534 ParmVarDecl *Param = FD->getParamDecl(p); 535 if (!Param->hasDefaultArg()) { 536 if (Param->isInvalidDecl()) 537 /* We already complained about this parameter. */; 538 else if (Param->getIdentifier()) 539 Diag(Param->getLocation(), 540 diag::err_param_default_argument_missing_name) 541 << Param->getIdentifier(); 542 else 543 Diag(Param->getLocation(), 544 diag::err_param_default_argument_missing); 545 546 LastMissingDefaultArg = p; 547 } 548 } 549 550 if (LastMissingDefaultArg > 0) { 551 // Some default arguments were missing. Clear out all of the 552 // default arguments up to (and including) the last missing 553 // default argument, so that we leave the function parameters 554 // in a semantically valid state. 555 for (p = 0; p <= LastMissingDefaultArg; ++p) { 556 ParmVarDecl *Param = FD->getParamDecl(p); 557 if (Param->hasDefaultArg()) { 558 Param->setDefaultArg(0); 559 } 560 } 561 } 562} 563 564/// isCurrentClassName - Determine whether the identifier II is the 565/// name of the class type currently being defined. In the case of 566/// nested classes, this will only return true if II is the name of 567/// the innermost class. 568bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 569 const CXXScopeSpec *SS) { 570 assert(getLangOptions().CPlusPlus && "No class names in C!"); 571 572 CXXRecordDecl *CurDecl; 573 if (SS && SS->isSet() && !SS->isInvalid()) { 574 DeclContext *DC = computeDeclContext(*SS, true); 575 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 576 } else 577 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 578 579 if (CurDecl && CurDecl->getIdentifier()) 580 return &II == CurDecl->getIdentifier(); 581 else 582 return false; 583} 584 585/// \brief Check the validity of a C++ base class specifier. 586/// 587/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 588/// and returns NULL otherwise. 589CXXBaseSpecifier * 590Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 591 SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeSourceInfo *TInfo, 594 SourceLocation EllipsisLoc) { 595 QualType BaseType = TInfo->getType(); 596 597 // C++ [class.union]p1: 598 // A union shall not have base classes. 599 if (Class->isUnion()) { 600 Diag(Class->getLocation(), diag::err_base_clause_on_union) 601 << SpecifierRange; 602 return 0; 603 } 604 605 if (EllipsisLoc.isValid() && 606 !TInfo->getType()->containsUnexpandedParameterPack()) { 607 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 608 << TInfo->getTypeLoc().getSourceRange(); 609 EllipsisLoc = SourceLocation(); 610 } 611 612 if (BaseType->isDependentType()) 613 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 614 Class->getTagKind() == TTK_Class, 615 Access, TInfo, EllipsisLoc); 616 617 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 618 619 // Base specifiers must be record types. 620 if (!BaseType->isRecordType()) { 621 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 622 return 0; 623 } 624 625 // C++ [class.union]p1: 626 // A union shall not be used as a base class. 627 if (BaseType->isUnionType()) { 628 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 629 return 0; 630 } 631 632 // C++ [class.derived]p2: 633 // The class-name in a base-specifier shall not be an incompletely 634 // defined class. 635 if (RequireCompleteType(BaseLoc, BaseType, 636 PDiag(diag::err_incomplete_base_class) 637 << SpecifierRange)) { 638 Class->setInvalidDecl(); 639 return 0; 640 } 641 642 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 643 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 644 assert(BaseDecl && "Record type has no declaration"); 645 BaseDecl = BaseDecl->getDefinition(); 646 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 647 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 648 assert(CXXBaseDecl && "Base type is not a C++ type"); 649 650 // C++ [class]p3: 651 // If a class is marked final and it appears as a base-type-specifier in 652 // base-clause, the program is ill-formed. 653 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 654 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 655 << CXXBaseDecl->getDeclName(); 656 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 657 << CXXBaseDecl->getDeclName(); 658 return 0; 659 } 660 661 if (BaseDecl->isInvalidDecl()) 662 Class->setInvalidDecl(); 663 664 // Create the base specifier. 665 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 666 Class->getTagKind() == TTK_Class, 667 Access, TInfo, EllipsisLoc); 668} 669 670/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 671/// one entry in the base class list of a class specifier, for 672/// example: 673/// class foo : public bar, virtual private baz { 674/// 'public bar' and 'virtual private baz' are each base-specifiers. 675BaseResult 676Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 677 bool Virtual, AccessSpecifier Access, 678 ParsedType basetype, SourceLocation BaseLoc, 679 SourceLocation EllipsisLoc) { 680 if (!classdecl) 681 return true; 682 683 AdjustDeclIfTemplate(classdecl); 684 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 685 if (!Class) 686 return true; 687 688 TypeSourceInfo *TInfo = 0; 689 GetTypeFromParser(basetype, &TInfo); 690 691 if (EllipsisLoc.isInvalid() && 692 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 693 UPPC_BaseType)) 694 return true; 695 696 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 697 Virtual, Access, TInfo, 698 EllipsisLoc)) 699 return BaseSpec; 700 701 return true; 702} 703 704/// \brief Performs the actual work of attaching the given base class 705/// specifiers to a C++ class. 706bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 707 unsigned NumBases) { 708 if (NumBases == 0) 709 return false; 710 711 // Used to keep track of which base types we have already seen, so 712 // that we can properly diagnose redundant direct base types. Note 713 // that the key is always the unqualified canonical type of the base 714 // class. 715 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 716 717 // Copy non-redundant base specifiers into permanent storage. 718 unsigned NumGoodBases = 0; 719 bool Invalid = false; 720 for (unsigned idx = 0; idx < NumBases; ++idx) { 721 QualType NewBaseType 722 = Context.getCanonicalType(Bases[idx]->getType()); 723 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 724 if (!Class->hasObjectMember()) { 725 if (const RecordType *FDTTy = 726 NewBaseType.getTypePtr()->getAs<RecordType>()) 727 if (FDTTy->getDecl()->hasObjectMember()) 728 Class->setHasObjectMember(true); 729 } 730 731 if (KnownBaseTypes[NewBaseType]) { 732 // C++ [class.mi]p3: 733 // A class shall not be specified as a direct base class of a 734 // derived class more than once. 735 Diag(Bases[idx]->getSourceRange().getBegin(), 736 diag::err_duplicate_base_class) 737 << KnownBaseTypes[NewBaseType]->getType() 738 << Bases[idx]->getSourceRange(); 739 740 // Delete the duplicate base class specifier; we're going to 741 // overwrite its pointer later. 742 Context.Deallocate(Bases[idx]); 743 744 Invalid = true; 745 } else { 746 // Okay, add this new base class. 747 KnownBaseTypes[NewBaseType] = Bases[idx]; 748 Bases[NumGoodBases++] = Bases[idx]; 749 } 750 } 751 752 // Attach the remaining base class specifiers to the derived class. 753 Class->setBases(Bases, NumGoodBases); 754 755 // Delete the remaining (good) base class specifiers, since their 756 // data has been copied into the CXXRecordDecl. 757 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 758 Context.Deallocate(Bases[idx]); 759 760 return Invalid; 761} 762 763/// ActOnBaseSpecifiers - Attach the given base specifiers to the 764/// class, after checking whether there are any duplicate base 765/// classes. 766void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 767 unsigned NumBases) { 768 if (!ClassDecl || !Bases || !NumBases) 769 return; 770 771 AdjustDeclIfTemplate(ClassDecl); 772 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 773 (CXXBaseSpecifier**)(Bases), NumBases); 774} 775 776static CXXRecordDecl *GetClassForType(QualType T) { 777 if (const RecordType *RT = T->getAs<RecordType>()) 778 return cast<CXXRecordDecl>(RT->getDecl()); 779 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 780 return ICT->getDecl(); 781 else 782 return 0; 783} 784 785/// \brief Determine whether the type \p Derived is a C++ class that is 786/// derived from the type \p Base. 787bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 788 if (!getLangOptions().CPlusPlus) 789 return false; 790 791 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 792 if (!DerivedRD) 793 return false; 794 795 CXXRecordDecl *BaseRD = GetClassForType(Base); 796 if (!BaseRD) 797 return false; 798 799 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 800 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 801} 802 803/// \brief Determine whether the type \p Derived is a C++ class that is 804/// derived from the type \p Base. 805bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 806 if (!getLangOptions().CPlusPlus) 807 return false; 808 809 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 810 if (!DerivedRD) 811 return false; 812 813 CXXRecordDecl *BaseRD = GetClassForType(Base); 814 if (!BaseRD) 815 return false; 816 817 return DerivedRD->isDerivedFrom(BaseRD, Paths); 818} 819 820void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 821 CXXCastPath &BasePathArray) { 822 assert(BasePathArray.empty() && "Base path array must be empty!"); 823 assert(Paths.isRecordingPaths() && "Must record paths!"); 824 825 const CXXBasePath &Path = Paths.front(); 826 827 // We first go backward and check if we have a virtual base. 828 // FIXME: It would be better if CXXBasePath had the base specifier for 829 // the nearest virtual base. 830 unsigned Start = 0; 831 for (unsigned I = Path.size(); I != 0; --I) { 832 if (Path[I - 1].Base->isVirtual()) { 833 Start = I - 1; 834 break; 835 } 836 } 837 838 // Now add all bases. 839 for (unsigned I = Start, E = Path.size(); I != E; ++I) 840 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 841} 842 843/// \brief Determine whether the given base path includes a virtual 844/// base class. 845bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 846 for (CXXCastPath::const_iterator B = BasePath.begin(), 847 BEnd = BasePath.end(); 848 B != BEnd; ++B) 849 if ((*B)->isVirtual()) 850 return true; 851 852 return false; 853} 854 855/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 856/// conversion (where Derived and Base are class types) is 857/// well-formed, meaning that the conversion is unambiguous (and 858/// that all of the base classes are accessible). Returns true 859/// and emits a diagnostic if the code is ill-formed, returns false 860/// otherwise. Loc is the location where this routine should point to 861/// if there is an error, and Range is the source range to highlight 862/// if there is an error. 863bool 864Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 865 unsigned InaccessibleBaseID, 866 unsigned AmbigiousBaseConvID, 867 SourceLocation Loc, SourceRange Range, 868 DeclarationName Name, 869 CXXCastPath *BasePath) { 870 // First, determine whether the path from Derived to Base is 871 // ambiguous. This is slightly more expensive than checking whether 872 // the Derived to Base conversion exists, because here we need to 873 // explore multiple paths to determine if there is an ambiguity. 874 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 875 /*DetectVirtual=*/false); 876 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 877 assert(DerivationOkay && 878 "Can only be used with a derived-to-base conversion"); 879 (void)DerivationOkay; 880 881 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 882 if (InaccessibleBaseID) { 883 // Check that the base class can be accessed. 884 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 885 InaccessibleBaseID)) { 886 case AR_inaccessible: 887 return true; 888 case AR_accessible: 889 case AR_dependent: 890 case AR_delayed: 891 break; 892 } 893 } 894 895 // Build a base path if necessary. 896 if (BasePath) 897 BuildBasePathArray(Paths, *BasePath); 898 return false; 899 } 900 901 // We know that the derived-to-base conversion is ambiguous, and 902 // we're going to produce a diagnostic. Perform the derived-to-base 903 // search just one more time to compute all of the possible paths so 904 // that we can print them out. This is more expensive than any of 905 // the previous derived-to-base checks we've done, but at this point 906 // performance isn't as much of an issue. 907 Paths.clear(); 908 Paths.setRecordingPaths(true); 909 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 910 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 911 (void)StillOkay; 912 913 // Build up a textual representation of the ambiguous paths, e.g., 914 // D -> B -> A, that will be used to illustrate the ambiguous 915 // conversions in the diagnostic. We only print one of the paths 916 // to each base class subobject. 917 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 918 919 Diag(Loc, AmbigiousBaseConvID) 920 << Derived << Base << PathDisplayStr << Range << Name; 921 return true; 922} 923 924bool 925Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 926 SourceLocation Loc, SourceRange Range, 927 CXXCastPath *BasePath, 928 bool IgnoreAccess) { 929 return CheckDerivedToBaseConversion(Derived, Base, 930 IgnoreAccess ? 0 931 : diag::err_upcast_to_inaccessible_base, 932 diag::err_ambiguous_derived_to_base_conv, 933 Loc, Range, DeclarationName(), 934 BasePath); 935} 936 937 938/// @brief Builds a string representing ambiguous paths from a 939/// specific derived class to different subobjects of the same base 940/// class. 941/// 942/// This function builds a string that can be used in error messages 943/// to show the different paths that one can take through the 944/// inheritance hierarchy to go from the derived class to different 945/// subobjects of a base class. The result looks something like this: 946/// @code 947/// struct D -> struct B -> struct A 948/// struct D -> struct C -> struct A 949/// @endcode 950std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 951 std::string PathDisplayStr; 952 std::set<unsigned> DisplayedPaths; 953 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 954 Path != Paths.end(); ++Path) { 955 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 956 // We haven't displayed a path to this particular base 957 // class subobject yet. 958 PathDisplayStr += "\n "; 959 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 960 for (CXXBasePath::const_iterator Element = Path->begin(); 961 Element != Path->end(); ++Element) 962 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 963 } 964 } 965 966 return PathDisplayStr; 967} 968 969//===----------------------------------------------------------------------===// 970// C++ class member Handling 971//===----------------------------------------------------------------------===// 972 973/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 974Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 975 SourceLocation ASLoc, 976 SourceLocation ColonLoc) { 977 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 978 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 979 ASLoc, ColonLoc); 980 CurContext->addHiddenDecl(ASDecl); 981 return ASDecl; 982} 983 984/// CheckOverrideControl - Check C++0x override control semantics. 985void Sema::CheckOverrideControl(const Decl *D) { 986 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 987 if (!MD || !MD->isVirtual()) 988 return; 989 990 if (MD->isDependentContext()) 991 return; 992 993 // C++0x [class.virtual]p3: 994 // If a virtual function is marked with the virt-specifier override and does 995 // not override a member function of a base class, 996 // the program is ill-formed. 997 bool HasOverriddenMethods = 998 MD->begin_overridden_methods() != MD->end_overridden_methods(); 999 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1000 Diag(MD->getLocation(), 1001 diag::err_function_marked_override_not_overriding) 1002 << MD->getDeclName(); 1003 return; 1004 } 1005} 1006 1007/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1008/// function overrides a virtual member function marked 'final', according to 1009/// C++0x [class.virtual]p3. 1010bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1011 const CXXMethodDecl *Old) { 1012 if (!Old->hasAttr<FinalAttr>()) 1013 return false; 1014 1015 Diag(New->getLocation(), diag::err_final_function_overridden) 1016 << New->getDeclName(); 1017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1018 return true; 1019} 1020 1021/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1022/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1023/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1024/// any. 1025Decl * 1026Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1027 MultiTemplateParamsArg TemplateParameterLists, 1028 ExprTy *BW, const VirtSpecifiers &VS, 1029 ExprTy *InitExpr, bool IsDefinition) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (SS.isSet() && !SS.isInvalid()) { 1095 // The user provided a superfluous scope specifier inside a class 1096 // definition: 1097 // 1098 // class X { 1099 // int X::member; 1100 // }; 1101 DeclContext *DC = 0; 1102 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1103 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1104 << Name << FixItHint::CreateRemoval(SS.getRange()); 1105 else 1106 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1107 << Name << SS.getRange(); 1108 1109 SS.clear(); 1110 } 1111 1112 // FIXME: Check for template parameters! 1113 // FIXME: Check that the name is an identifier! 1114 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1115 AS); 1116 assert(Member && "HandleField never returns null"); 1117 } else { 1118 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1119 if (!Member) { 1120 return 0; 1121 } 1122 1123 // Non-instance-fields can't have a bitfield. 1124 if (BitWidth) { 1125 if (Member->isInvalidDecl()) { 1126 // don't emit another diagnostic. 1127 } else if (isa<VarDecl>(Member)) { 1128 // C++ 9.6p3: A bit-field shall not be a static member. 1129 // "static member 'A' cannot be a bit-field" 1130 Diag(Loc, diag::err_static_not_bitfield) 1131 << Name << BitWidth->getSourceRange(); 1132 } else if (isa<TypedefDecl>(Member)) { 1133 // "typedef member 'x' cannot be a bit-field" 1134 Diag(Loc, diag::err_typedef_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else { 1137 // A function typedef ("typedef int f(); f a;"). 1138 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1139 Diag(Loc, diag::err_not_integral_type_bitfield) 1140 << Name << cast<ValueDecl>(Member)->getType() 1141 << BitWidth->getSourceRange(); 1142 } 1143 1144 BitWidth = 0; 1145 Member->setInvalidDecl(); 1146 } 1147 1148 Member->setAccess(AS); 1149 1150 // If we have declared a member function template, set the access of the 1151 // templated declaration as well. 1152 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1153 FunTmpl->getTemplatedDecl()->setAccess(AS); 1154 } 1155 1156 if (VS.isOverrideSpecified()) { 1157 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1158 if (!MD || !MD->isVirtual()) { 1159 Diag(Member->getLocStart(), 1160 diag::override_keyword_only_allowed_on_virtual_member_functions) 1161 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1162 } else 1163 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1164 } 1165 if (VS.isFinalSpecified()) { 1166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1167 if (!MD || !MD->isVirtual()) { 1168 Diag(Member->getLocStart(), 1169 diag::override_keyword_only_allowed_on_virtual_member_functions) 1170 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1171 } else 1172 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1173 } 1174 1175 if (VS.getLastLocation().isValid()) { 1176 // Update the end location of a method that has a virt-specifiers. 1177 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1178 MD->setRangeEnd(VS.getLastLocation()); 1179 } 1180 1181 CheckOverrideControl(Member); 1182 1183 assert((Name || isInstField) && "No identifier for non-field ?"); 1184 1185 if (Init) 1186 AddInitializerToDecl(Member, Init, false, 1187 DS.getTypeSpecType() == DeclSpec::TST_auto); 1188 1189 FinalizeDeclaration(Member); 1190 1191 if (isInstField) 1192 FieldCollector->Add(cast<FieldDecl>(Member)); 1193 return Member; 1194} 1195 1196/// \brief Find the direct and/or virtual base specifiers that 1197/// correspond to the given base type, for use in base initialization 1198/// within a constructor. 1199static bool FindBaseInitializer(Sema &SemaRef, 1200 CXXRecordDecl *ClassDecl, 1201 QualType BaseType, 1202 const CXXBaseSpecifier *&DirectBaseSpec, 1203 const CXXBaseSpecifier *&VirtualBaseSpec) { 1204 // First, check for a direct base class. 1205 DirectBaseSpec = 0; 1206 for (CXXRecordDecl::base_class_const_iterator Base 1207 = ClassDecl->bases_begin(); 1208 Base != ClassDecl->bases_end(); ++Base) { 1209 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1210 // We found a direct base of this type. That's what we're 1211 // initializing. 1212 DirectBaseSpec = &*Base; 1213 break; 1214 } 1215 } 1216 1217 // Check for a virtual base class. 1218 // FIXME: We might be able to short-circuit this if we know in advance that 1219 // there are no virtual bases. 1220 VirtualBaseSpec = 0; 1221 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1222 // We haven't found a base yet; search the class hierarchy for a 1223 // virtual base class. 1224 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1225 /*DetectVirtual=*/false); 1226 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1227 BaseType, Paths)) { 1228 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1229 Path != Paths.end(); ++Path) { 1230 if (Path->back().Base->isVirtual()) { 1231 VirtualBaseSpec = Path->back().Base; 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 1238 return DirectBaseSpec || VirtualBaseSpec; 1239} 1240 1241/// ActOnMemInitializer - Handle a C++ member initializer. 1242MemInitResult 1243Sema::ActOnMemInitializer(Decl *ConstructorD, 1244 Scope *S, 1245 CXXScopeSpec &SS, 1246 IdentifierInfo *MemberOrBase, 1247 ParsedType TemplateTypeTy, 1248 SourceLocation IdLoc, 1249 SourceLocation LParenLoc, 1250 ExprTy **Args, unsigned NumArgs, 1251 SourceLocation RParenLoc, 1252 SourceLocation EllipsisLoc) { 1253 if (!ConstructorD) 1254 return true; 1255 1256 AdjustDeclIfTemplate(ConstructorD); 1257 1258 CXXConstructorDecl *Constructor 1259 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1260 if (!Constructor) { 1261 // The user wrote a constructor initializer on a function that is 1262 // not a C++ constructor. Ignore the error for now, because we may 1263 // have more member initializers coming; we'll diagnose it just 1264 // once in ActOnMemInitializers. 1265 return true; 1266 } 1267 1268 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1269 1270 // C++ [class.base.init]p2: 1271 // Names in a mem-initializer-id are looked up in the scope of the 1272 // constructor's class and, if not found in that scope, are looked 1273 // up in the scope containing the constructor's definition. 1274 // [Note: if the constructor's class contains a member with the 1275 // same name as a direct or virtual base class of the class, a 1276 // mem-initializer-id naming the member or base class and composed 1277 // of a single identifier refers to the class member. A 1278 // mem-initializer-id for the hidden base class may be specified 1279 // using a qualified name. ] 1280 if (!SS.getScopeRep() && !TemplateTypeTy) { 1281 // Look for a member, first. 1282 FieldDecl *Member = 0; 1283 DeclContext::lookup_result Result 1284 = ClassDecl->lookup(MemberOrBase); 1285 if (Result.first != Result.second) { 1286 Member = dyn_cast<FieldDecl>(*Result.first); 1287 1288 if (Member) { 1289 if (EllipsisLoc.isValid()) 1290 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1291 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1292 1293 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1294 LParenLoc, RParenLoc); 1295 } 1296 1297 // Handle anonymous union case. 1298 if (IndirectFieldDecl* IndirectField 1299 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1300 if (EllipsisLoc.isValid()) 1301 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1302 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1303 1304 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1305 NumArgs, IdLoc, 1306 LParenLoc, RParenLoc); 1307 } 1308 } 1309 } 1310 // It didn't name a member, so see if it names a class. 1311 QualType BaseType; 1312 TypeSourceInfo *TInfo = 0; 1313 1314 if (TemplateTypeTy) { 1315 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1316 } else { 1317 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1318 LookupParsedName(R, S, &SS); 1319 1320 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1321 if (!TyD) { 1322 if (R.isAmbiguous()) return true; 1323 1324 // We don't want access-control diagnostics here. 1325 R.suppressDiagnostics(); 1326 1327 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1328 bool NotUnknownSpecialization = false; 1329 DeclContext *DC = computeDeclContext(SS, false); 1330 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1331 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1332 1333 if (!NotUnknownSpecialization) { 1334 // When the scope specifier can refer to a member of an unknown 1335 // specialization, we take it as a type name. 1336 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1337 SS.getWithLocInContext(Context), 1338 *MemberOrBase, IdLoc); 1339 if (BaseType.isNull()) 1340 return true; 1341 1342 R.clear(); 1343 R.setLookupName(MemberOrBase); 1344 } 1345 } 1346 1347 // If no results were found, try to correct typos. 1348 if (R.empty() && BaseType.isNull() && 1349 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1350 R.isSingleResult()) { 1351 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1352 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1353 // We have found a non-static data member with a similar 1354 // name to what was typed; complain and initialize that 1355 // member. 1356 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1357 << MemberOrBase << true << R.getLookupName() 1358 << FixItHint::CreateReplacement(R.getNameLoc(), 1359 R.getLookupName().getAsString()); 1360 Diag(Member->getLocation(), diag::note_previous_decl) 1361 << Member->getDeclName(); 1362 1363 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1364 LParenLoc, RParenLoc); 1365 } 1366 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1367 const CXXBaseSpecifier *DirectBaseSpec; 1368 const CXXBaseSpecifier *VirtualBaseSpec; 1369 if (FindBaseInitializer(*this, ClassDecl, 1370 Context.getTypeDeclType(Type), 1371 DirectBaseSpec, VirtualBaseSpec)) { 1372 // We have found a direct or virtual base class with a 1373 // similar name to what was typed; complain and initialize 1374 // that base class. 1375 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1376 << MemberOrBase << false << R.getLookupName() 1377 << FixItHint::CreateReplacement(R.getNameLoc(), 1378 R.getLookupName().getAsString()); 1379 1380 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1381 : VirtualBaseSpec; 1382 Diag(BaseSpec->getSourceRange().getBegin(), 1383 diag::note_base_class_specified_here) 1384 << BaseSpec->getType() 1385 << BaseSpec->getSourceRange(); 1386 1387 TyD = Type; 1388 } 1389 } 1390 } 1391 1392 if (!TyD && BaseType.isNull()) { 1393 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1394 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1395 return true; 1396 } 1397 } 1398 1399 if (BaseType.isNull()) { 1400 BaseType = Context.getTypeDeclType(TyD); 1401 if (SS.isSet()) { 1402 NestedNameSpecifier *Qualifier = 1403 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1404 1405 // FIXME: preserve source range information 1406 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1407 } 1408 } 1409 } 1410 1411 if (!TInfo) 1412 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1413 1414 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1415 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1416} 1417 1418/// Checks an initializer expression for use of uninitialized fields, such as 1419/// containing the field that is being initialized. Returns true if there is an 1420/// uninitialized field was used an updates the SourceLocation parameter; false 1421/// otherwise. 1422static bool InitExprContainsUninitializedFields(const Stmt *S, 1423 const ValueDecl *LhsField, 1424 SourceLocation *L) { 1425 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1426 1427 if (isa<CallExpr>(S)) { 1428 // Do not descend into function calls or constructors, as the use 1429 // of an uninitialized field may be valid. One would have to inspect 1430 // the contents of the function/ctor to determine if it is safe or not. 1431 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1432 // may be safe, depending on what the function/ctor does. 1433 return false; 1434 } 1435 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1436 const NamedDecl *RhsField = ME->getMemberDecl(); 1437 1438 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1439 // The member expression points to a static data member. 1440 assert(VD->isStaticDataMember() && 1441 "Member points to non-static data member!"); 1442 (void)VD; 1443 return false; 1444 } 1445 1446 if (isa<EnumConstantDecl>(RhsField)) { 1447 // The member expression points to an enum. 1448 return false; 1449 } 1450 1451 if (RhsField == LhsField) { 1452 // Initializing a field with itself. Throw a warning. 1453 // But wait; there are exceptions! 1454 // Exception #1: The field may not belong to this record. 1455 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1456 const Expr *base = ME->getBase(); 1457 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1458 // Even though the field matches, it does not belong to this record. 1459 return false; 1460 } 1461 // None of the exceptions triggered; return true to indicate an 1462 // uninitialized field was used. 1463 *L = ME->getMemberLoc(); 1464 return true; 1465 } 1466 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1467 // sizeof/alignof doesn't reference contents, do not warn. 1468 return false; 1469 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1470 // address-of doesn't reference contents (the pointer may be dereferenced 1471 // in the same expression but it would be rare; and weird). 1472 if (UOE->getOpcode() == UO_AddrOf) 1473 return false; 1474 } 1475 for (Stmt::const_child_range it = S->children(); it; ++it) { 1476 if (!*it) { 1477 // An expression such as 'member(arg ?: "")' may trigger this. 1478 continue; 1479 } 1480 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1481 return true; 1482 } 1483 return false; 1484} 1485 1486MemInitResult 1487Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1488 unsigned NumArgs, SourceLocation IdLoc, 1489 SourceLocation LParenLoc, 1490 SourceLocation RParenLoc) { 1491 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1492 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1493 assert((DirectMember || IndirectMember) && 1494 "Member must be a FieldDecl or IndirectFieldDecl"); 1495 1496 if (Member->isInvalidDecl()) 1497 return true; 1498 1499 // Diagnose value-uses of fields to initialize themselves, e.g. 1500 // foo(foo) 1501 // where foo is not also a parameter to the constructor. 1502 // TODO: implement -Wuninitialized and fold this into that framework. 1503 for (unsigned i = 0; i < NumArgs; ++i) { 1504 SourceLocation L; 1505 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1506 // FIXME: Return true in the case when other fields are used before being 1507 // uninitialized. For example, let this field be the i'th field. When 1508 // initializing the i'th field, throw a warning if any of the >= i'th 1509 // fields are used, as they are not yet initialized. 1510 // Right now we are only handling the case where the i'th field uses 1511 // itself in its initializer. 1512 Diag(L, diag::warn_field_is_uninit); 1513 } 1514 } 1515 1516 bool HasDependentArg = false; 1517 for (unsigned i = 0; i < NumArgs; i++) 1518 HasDependentArg |= Args[i]->isTypeDependent(); 1519 1520 Expr *Init; 1521 if (Member->getType()->isDependentType() || HasDependentArg) { 1522 // Can't check initialization for a member of dependent type or when 1523 // any of the arguments are type-dependent expressions. 1524 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1525 RParenLoc); 1526 1527 // Erase any temporaries within this evaluation context; we're not 1528 // going to track them in the AST, since we'll be rebuilding the 1529 // ASTs during template instantiation. 1530 ExprTemporaries.erase( 1531 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1532 ExprTemporaries.end()); 1533 } else { 1534 // Initialize the member. 1535 InitializedEntity MemberEntity = 1536 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1537 : InitializedEntity::InitializeMember(IndirectMember, 0); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1542 1543 ExprResult MemberInit = 1544 InitSeq.Perform(*this, MemberEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (MemberInit.isInvalid()) 1547 return true; 1548 1549 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1550 1551 // C++0x [class.base.init]p7: 1552 // The initialization of each base and member constitutes a 1553 // full-expression. 1554 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 // If we are in a dependent context, template instantiation will 1559 // perform this type-checking again. Just save the arguments that we 1560 // received in a ParenListExpr. 1561 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1562 // of the information that we have about the member 1563 // initializer. However, deconstructing the ASTs is a dicey process, 1564 // and this approach is far more likely to get the corner cases right. 1565 if (CurContext->isDependentContext()) 1566 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1567 RParenLoc); 1568 else 1569 Init = MemberInit.get(); 1570 } 1571 1572 if (DirectMember) { 1573 return new (Context) CXXCtorInitializer(Context, DirectMember, 1574 IdLoc, LParenLoc, Init, 1575 RParenLoc); 1576 } else { 1577 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1578 IdLoc, LParenLoc, Init, 1579 RParenLoc); 1580 } 1581} 1582 1583MemInitResult 1584Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation NameLoc, 1587 SourceLocation LParenLoc, 1588 SourceLocation RParenLoc, 1589 CXXRecordDecl *ClassDecl) { 1590 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1591 if (!LangOpts.CPlusPlus0x) 1592 return Diag(Loc, diag::err_delegation_0x_only) 1593 << TInfo->getTypeLoc().getLocalSourceRange(); 1594 1595 // Initialize the object. 1596 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1597 QualType(ClassDecl->getTypeForDecl(), 0)); 1598 InitializationKind Kind = 1599 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1600 1601 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1602 1603 ExprResult DelegationInit = 1604 InitSeq.Perform(*this, DelegationEntity, Kind, 1605 MultiExprArg(*this, Args, NumArgs), 0); 1606 if (DelegationInit.isInvalid()) 1607 return true; 1608 1609 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1610 CXXConstructorDecl *Constructor 1611 = ConExpr->getConstructor(); 1612 assert(Constructor && "Delegating constructor with no target?"); 1613 1614 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1615 1616 // C++0x [class.base.init]p7: 1617 // The initialization of each base and member constitutes a 1618 // full-expression. 1619 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1620 if (DelegationInit.isInvalid()) 1621 return true; 1622 1623 // If we are in a dependent context, template instantiation will 1624 // perform this type-checking again. Just save the arguments that we 1625 // received in a ParenListExpr. 1626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1627 // of the information that we have about the base 1628 // initializer. However, deconstructing the ASTs is a dicey process, 1629 // and this approach is far more likely to get the corner cases right. 1630 if (CurContext->isDependentContext()) { 1631 ExprResult Init 1632 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1633 NumArgs, RParenLoc)); 1634 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1635 Constructor, Init.takeAs<Expr>(), 1636 RParenLoc); 1637 } 1638 1639 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1640 DelegationInit.takeAs<Expr>(), 1641 RParenLoc); 1642} 1643 1644MemInitResult 1645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1646 Expr **Args, unsigned NumArgs, 1647 SourceLocation LParenLoc, SourceLocation RParenLoc, 1648 CXXRecordDecl *ClassDecl, 1649 SourceLocation EllipsisLoc) { 1650 bool HasDependentArg = false; 1651 for (unsigned i = 0; i < NumArgs; i++) 1652 HasDependentArg |= Args[i]->isTypeDependent(); 1653 1654 SourceLocation BaseLoc 1655 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1656 1657 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1658 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1659 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1660 1661 // C++ [class.base.init]p2: 1662 // [...] Unless the mem-initializer-id names a nonstatic data 1663 // member of the constructor's class or a direct or virtual base 1664 // of that class, the mem-initializer is ill-formed. A 1665 // mem-initializer-list can initialize a base class using any 1666 // name that denotes that base class type. 1667 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1668 1669 if (EllipsisLoc.isValid()) { 1670 // This is a pack expansion. 1671 if (!BaseType->containsUnexpandedParameterPack()) { 1672 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1673 << SourceRange(BaseLoc, RParenLoc); 1674 1675 EllipsisLoc = SourceLocation(); 1676 } 1677 } else { 1678 // Check for any unexpanded parameter packs. 1679 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1680 return true; 1681 1682 for (unsigned I = 0; I != NumArgs; ++I) 1683 if (DiagnoseUnexpandedParameterPack(Args[I])) 1684 return true; 1685 } 1686 1687 // Check for direct and virtual base classes. 1688 const CXXBaseSpecifier *DirectBaseSpec = 0; 1689 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1690 if (!Dependent) { 1691 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1692 BaseType)) 1693 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1694 LParenLoc, RParenLoc, ClassDecl); 1695 1696 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1697 VirtualBaseSpec); 1698 1699 // C++ [base.class.init]p2: 1700 // Unless the mem-initializer-id names a nonstatic data member of the 1701 // constructor's class or a direct or virtual base of that class, the 1702 // mem-initializer is ill-formed. 1703 if (!DirectBaseSpec && !VirtualBaseSpec) { 1704 // If the class has any dependent bases, then it's possible that 1705 // one of those types will resolve to the same type as 1706 // BaseType. Therefore, just treat this as a dependent base 1707 // class initialization. FIXME: Should we try to check the 1708 // initialization anyway? It seems odd. 1709 if (ClassDecl->hasAnyDependentBases()) 1710 Dependent = true; 1711 else 1712 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1713 << BaseType << Context.getTypeDeclType(ClassDecl) 1714 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1715 } 1716 } 1717 1718 if (Dependent) { 1719 // Can't check initialization for a base of dependent type or when 1720 // any of the arguments are type-dependent expressions. 1721 ExprResult BaseInit 1722 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1723 RParenLoc)); 1724 1725 // Erase any temporaries within this evaluation context; we're not 1726 // going to track them in the AST, since we'll be rebuilding the 1727 // ASTs during template instantiation. 1728 ExprTemporaries.erase( 1729 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1730 ExprTemporaries.end()); 1731 1732 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1733 /*IsVirtual=*/false, 1734 LParenLoc, 1735 BaseInit.takeAs<Expr>(), 1736 RParenLoc, 1737 EllipsisLoc); 1738 } 1739 1740 // C++ [base.class.init]p2: 1741 // If a mem-initializer-id is ambiguous because it designates both 1742 // a direct non-virtual base class and an inherited virtual base 1743 // class, the mem-initializer is ill-formed. 1744 if (DirectBaseSpec && VirtualBaseSpec) 1745 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1746 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1747 1748 CXXBaseSpecifier *BaseSpec 1749 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1750 if (!BaseSpec) 1751 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1752 1753 // Initialize the base. 1754 InitializedEntity BaseEntity = 1755 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1756 InitializationKind Kind = 1757 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1758 1759 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1760 1761 ExprResult BaseInit = 1762 InitSeq.Perform(*this, BaseEntity, Kind, 1763 MultiExprArg(*this, Args, NumArgs), 0); 1764 if (BaseInit.isInvalid()) 1765 return true; 1766 1767 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1768 1769 // C++0x [class.base.init]p7: 1770 // The initialization of each base and member constitutes a 1771 // full-expression. 1772 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 // If we are in a dependent context, template instantiation will 1777 // perform this type-checking again. Just save the arguments that we 1778 // received in a ParenListExpr. 1779 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1780 // of the information that we have about the base 1781 // initializer. However, deconstructing the ASTs is a dicey process, 1782 // and this approach is far more likely to get the corner cases right. 1783 if (CurContext->isDependentContext()) { 1784 ExprResult Init 1785 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1786 RParenLoc)); 1787 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1788 BaseSpec->isVirtual(), 1789 LParenLoc, 1790 Init.takeAs<Expr>(), 1791 RParenLoc, 1792 EllipsisLoc); 1793 } 1794 1795 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1796 BaseSpec->isVirtual(), 1797 LParenLoc, 1798 BaseInit.takeAs<Expr>(), 1799 RParenLoc, 1800 EllipsisLoc); 1801} 1802 1803/// ImplicitInitializerKind - How an implicit base or member initializer should 1804/// initialize its base or member. 1805enum ImplicitInitializerKind { 1806 IIK_Default, 1807 IIK_Copy, 1808 IIK_Move 1809}; 1810 1811static bool 1812BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1813 ImplicitInitializerKind ImplicitInitKind, 1814 CXXBaseSpecifier *BaseSpec, 1815 bool IsInheritedVirtualBase, 1816 CXXCtorInitializer *&CXXBaseInit) { 1817 InitializedEntity InitEntity 1818 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1819 IsInheritedVirtualBase); 1820 1821 ExprResult BaseInit; 1822 1823 switch (ImplicitInitKind) { 1824 case IIK_Default: { 1825 InitializationKind InitKind 1826 = InitializationKind::CreateDefault(Constructor->getLocation()); 1827 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1828 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1829 MultiExprArg(SemaRef, 0, 0)); 1830 break; 1831 } 1832 1833 case IIK_Copy: { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *CopyCtorArg = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Constructor->getLocation(), ParamType, 1840 VK_LValue, 0); 1841 1842 // Cast to the base class to avoid ambiguities. 1843 QualType ArgTy = 1844 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1845 ParamType.getQualifiers()); 1846 1847 CXXCastPath BasePath; 1848 BasePath.push_back(BaseSpec); 1849 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1850 CK_UncheckedDerivedToBase, 1851 VK_LValue, &BasePath).take(); 1852 1853 InitializationKind InitKind 1854 = InitializationKind::CreateDirect(Constructor->getLocation(), 1855 SourceLocation(), SourceLocation()); 1856 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1857 &CopyCtorArg, 1); 1858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1859 MultiExprArg(&CopyCtorArg, 1)); 1860 break; 1861 } 1862 1863 case IIK_Move: 1864 assert(false && "Unhandled initializer kind!"); 1865 } 1866 1867 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1868 if (BaseInit.isInvalid()) 1869 return true; 1870 1871 CXXBaseInit = 1872 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1873 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1874 SourceLocation()), 1875 BaseSpec->isVirtual(), 1876 SourceLocation(), 1877 BaseInit.takeAs<Expr>(), 1878 SourceLocation(), 1879 SourceLocation()); 1880 1881 return false; 1882} 1883 1884static bool 1885BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 FieldDecl *Field, 1888 CXXCtorInitializer *&CXXMemberInit) { 1889 if (Field->isInvalidDecl()) 1890 return true; 1891 1892 SourceLocation Loc = Constructor->getLocation(); 1893 1894 if (ImplicitInitKind == IIK_Copy) { 1895 ParmVarDecl *Param = Constructor->getParamDecl(0); 1896 QualType ParamType = Param->getType().getNonReferenceType(); 1897 1898 Expr *MemberExprBase = 1899 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1900 Loc, ParamType, VK_LValue, 0); 1901 1902 // Build a reference to this field within the parameter. 1903 CXXScopeSpec SS; 1904 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1905 Sema::LookupMemberName); 1906 MemberLookup.addDecl(Field, AS_public); 1907 MemberLookup.resolveKind(); 1908 ExprResult CopyCtorArg 1909 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1910 ParamType, Loc, 1911 /*IsArrow=*/false, 1912 SS, 1913 /*FirstQualifierInScope=*/0, 1914 MemberLookup, 1915 /*TemplateArgs=*/0); 1916 if (CopyCtorArg.isInvalid()) 1917 return true; 1918 1919 // When the field we are copying is an array, create index variables for 1920 // each dimension of the array. We use these index variables to subscript 1921 // the source array, and other clients (e.g., CodeGen) will perform the 1922 // necessary iteration with these index variables. 1923 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1924 QualType BaseType = Field->getType(); 1925 QualType SizeType = SemaRef.Context.getSizeType(); 1926 while (const ConstantArrayType *Array 1927 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1928 // Create the iteration variable for this array index. 1929 IdentifierInfo *IterationVarName = 0; 1930 { 1931 llvm::SmallString<8> Str; 1932 llvm::raw_svector_ostream OS(Str); 1933 OS << "__i" << IndexVariables.size(); 1934 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1935 } 1936 VarDecl *IterationVar 1937 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1938 IterationVarName, SizeType, 1939 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1940 SC_None, SC_None); 1941 IndexVariables.push_back(IterationVar); 1942 1943 // Create a reference to the iteration variable. 1944 ExprResult IterationVarRef 1945 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1946 assert(!IterationVarRef.isInvalid() && 1947 "Reference to invented variable cannot fail!"); 1948 1949 // Subscript the array with this iteration variable. 1950 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1951 Loc, 1952 IterationVarRef.take(), 1953 Loc); 1954 if (CopyCtorArg.isInvalid()) 1955 return true; 1956 1957 BaseType = Array->getElementType(); 1958 } 1959 1960 // Construct the entity that we will be initializing. For an array, this 1961 // will be first element in the array, which may require several levels 1962 // of array-subscript entities. 1963 llvm::SmallVector<InitializedEntity, 4> Entities; 1964 Entities.reserve(1 + IndexVariables.size()); 1965 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1966 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1967 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1968 0, 1969 Entities.back())); 1970 1971 // Direct-initialize to use the copy constructor. 1972 InitializationKind InitKind = 1973 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1974 1975 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1976 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1977 &CopyCtorArgE, 1); 1978 1979 ExprResult MemberInit 1980 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1981 MultiExprArg(&CopyCtorArgE, 1)); 1982 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1983 if (MemberInit.isInvalid()) 1984 return true; 1985 1986 CXXMemberInit 1987 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1988 MemberInit.takeAs<Expr>(), Loc, 1989 IndexVariables.data(), 1990 IndexVariables.size()); 1991 return false; 1992 } 1993 1994 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1995 1996 QualType FieldBaseElementType = 1997 SemaRef.Context.getBaseElementType(Field->getType()); 1998 1999 if (FieldBaseElementType->isRecordType()) { 2000 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2001 InitializationKind InitKind = 2002 InitializationKind::CreateDefault(Loc); 2003 2004 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2005 ExprResult MemberInit = 2006 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2007 2008 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2009 if (MemberInit.isInvalid()) 2010 return true; 2011 2012 CXXMemberInit = 2013 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2014 Field, Loc, Loc, 2015 MemberInit.get(), 2016 Loc); 2017 return false; 2018 } 2019 2020 if (FieldBaseElementType->isReferenceType()) { 2021 SemaRef.Diag(Constructor->getLocation(), 2022 diag::err_uninitialized_member_in_ctor) 2023 << (int)Constructor->isImplicit() 2024 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2025 << 0 << Field->getDeclName(); 2026 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2027 return true; 2028 } 2029 2030 if (FieldBaseElementType.isConstQualified()) { 2031 SemaRef.Diag(Constructor->getLocation(), 2032 diag::err_uninitialized_member_in_ctor) 2033 << (int)Constructor->isImplicit() 2034 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2035 << 1 << Field->getDeclName(); 2036 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2037 return true; 2038 } 2039 2040 // Nothing to initialize. 2041 CXXMemberInit = 0; 2042 return false; 2043} 2044 2045namespace { 2046struct BaseAndFieldInfo { 2047 Sema &S; 2048 CXXConstructorDecl *Ctor; 2049 bool AnyErrorsInInits; 2050 ImplicitInitializerKind IIK; 2051 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2052 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2053 2054 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2055 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2056 // FIXME: Handle implicit move constructors. 2057 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2058 IIK = IIK_Copy; 2059 else 2060 IIK = IIK_Default; 2061 } 2062}; 2063} 2064 2065static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2066 FieldDecl *Top, FieldDecl *Field) { 2067 2068 // Overwhelmingly common case: we have a direct initializer for this field. 2069 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2070 Info.AllToInit.push_back(Init); 2071 return false; 2072 } 2073 2074 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2075 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2076 assert(FieldClassType && "anonymous struct/union without record type"); 2077 CXXRecordDecl *FieldClassDecl 2078 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2079 2080 // Even though union members never have non-trivial default 2081 // constructions in C++03, we still build member initializers for aggregate 2082 // record types which can be union members, and C++0x allows non-trivial 2083 // default constructors for union members, so we ensure that only one 2084 // member is initialized for these. 2085 if (FieldClassDecl->isUnion()) { 2086 // First check for an explicit initializer for one field. 2087 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2088 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2089 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2090 Info.AllToInit.push_back(Init); 2091 2092 // Once we've initialized a field of an anonymous union, the union 2093 // field in the class is also initialized, so exit immediately. 2094 return false; 2095 } else if ((*FA)->isAnonymousStructOrUnion()) { 2096 if (CollectFieldInitializer(Info, Top, *FA)) 2097 return true; 2098 } 2099 } 2100 2101 // Fallthrough and construct a default initializer for the union as 2102 // a whole, which can call its default constructor if such a thing exists 2103 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2104 // behavior going forward with C++0x, when anonymous unions there are 2105 // finalized, we should revisit this. 2106 } else { 2107 // For structs, we simply descend through to initialize all members where 2108 // necessary. 2109 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2110 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2111 if (CollectFieldInitializer(Info, Top, *FA)) 2112 return true; 2113 } 2114 } 2115 } 2116 2117 // Don't try to build an implicit initializer if there were semantic 2118 // errors in any of the initializers (and therefore we might be 2119 // missing some that the user actually wrote). 2120 if (Info.AnyErrorsInInits) 2121 return false; 2122 2123 CXXCtorInitializer *Init = 0; 2124 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2125 return true; 2126 2127 if (Init) 2128 Info.AllToInit.push_back(Init); 2129 2130 return false; 2131} 2132 2133bool 2134Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2135 CXXCtorInitializer *Initializer) { 2136 assert(Initializer->isDelegatingInitializer()); 2137 Constructor->setNumCtorInitializers(1); 2138 CXXCtorInitializer **initializer = 2139 new (Context) CXXCtorInitializer*[1]; 2140 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2141 Constructor->setCtorInitializers(initializer); 2142 2143 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2144 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2145 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2146 } 2147 2148 DelegatingCtorDecls.push_back(Constructor); 2149 2150 return false; 2151} 2152 2153bool 2154Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2155 CXXCtorInitializer **Initializers, 2156 unsigned NumInitializers, 2157 bool AnyErrors) { 2158 if (Constructor->getDeclContext()->isDependentContext()) { 2159 // Just store the initializers as written, they will be checked during 2160 // instantiation. 2161 if (NumInitializers > 0) { 2162 Constructor->setNumCtorInitializers(NumInitializers); 2163 CXXCtorInitializer **baseOrMemberInitializers = 2164 new (Context) CXXCtorInitializer*[NumInitializers]; 2165 memcpy(baseOrMemberInitializers, Initializers, 2166 NumInitializers * sizeof(CXXCtorInitializer*)); 2167 Constructor->setCtorInitializers(baseOrMemberInitializers); 2168 } 2169 2170 return false; 2171 } 2172 2173 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2174 2175 // We need to build the initializer AST according to order of construction 2176 // and not what user specified in the Initializers list. 2177 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2178 if (!ClassDecl) 2179 return true; 2180 2181 bool HadError = false; 2182 2183 for (unsigned i = 0; i < NumInitializers; i++) { 2184 CXXCtorInitializer *Member = Initializers[i]; 2185 2186 if (Member->isBaseInitializer()) 2187 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2188 else 2189 Info.AllBaseFields[Member->getAnyMember()] = Member; 2190 } 2191 2192 // Keep track of the direct virtual bases. 2193 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2194 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2195 E = ClassDecl->bases_end(); I != E; ++I) { 2196 if (I->isVirtual()) 2197 DirectVBases.insert(I); 2198 } 2199 2200 // Push virtual bases before others. 2201 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2202 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2203 2204 if (CXXCtorInitializer *Value 2205 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2206 Info.AllToInit.push_back(Value); 2207 } else if (!AnyErrors) { 2208 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2209 CXXCtorInitializer *CXXBaseInit; 2210 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2211 VBase, IsInheritedVirtualBase, 2212 CXXBaseInit)) { 2213 HadError = true; 2214 continue; 2215 } 2216 2217 Info.AllToInit.push_back(CXXBaseInit); 2218 } 2219 } 2220 2221 // Non-virtual bases. 2222 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2223 E = ClassDecl->bases_end(); Base != E; ++Base) { 2224 // Virtuals are in the virtual base list and already constructed. 2225 if (Base->isVirtual()) 2226 continue; 2227 2228 if (CXXCtorInitializer *Value 2229 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2230 Info.AllToInit.push_back(Value); 2231 } else if (!AnyErrors) { 2232 CXXCtorInitializer *CXXBaseInit; 2233 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2234 Base, /*IsInheritedVirtualBase=*/false, 2235 CXXBaseInit)) { 2236 HadError = true; 2237 continue; 2238 } 2239 2240 Info.AllToInit.push_back(CXXBaseInit); 2241 } 2242 } 2243 2244 // Fields. 2245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2246 E = ClassDecl->field_end(); Field != E; ++Field) { 2247 if ((*Field)->getType()->isIncompleteArrayType()) { 2248 assert(ClassDecl->hasFlexibleArrayMember() && 2249 "Incomplete array type is not valid"); 2250 continue; 2251 } 2252 if (CollectFieldInitializer(Info, *Field, *Field)) 2253 HadError = true; 2254 } 2255 2256 NumInitializers = Info.AllToInit.size(); 2257 if (NumInitializers > 0) { 2258 Constructor->setNumCtorInitializers(NumInitializers); 2259 CXXCtorInitializer **baseOrMemberInitializers = 2260 new (Context) CXXCtorInitializer*[NumInitializers]; 2261 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2262 NumInitializers * sizeof(CXXCtorInitializer*)); 2263 Constructor->setCtorInitializers(baseOrMemberInitializers); 2264 2265 // Constructors implicitly reference the base and member 2266 // destructors. 2267 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2268 Constructor->getParent()); 2269 } 2270 2271 return HadError; 2272} 2273 2274static void *GetKeyForTopLevelField(FieldDecl *Field) { 2275 // For anonymous unions, use the class declaration as the key. 2276 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2277 if (RT->getDecl()->isAnonymousStructOrUnion()) 2278 return static_cast<void *>(RT->getDecl()); 2279 } 2280 return static_cast<void *>(Field); 2281} 2282 2283static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2284 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2285} 2286 2287static void *GetKeyForMember(ASTContext &Context, 2288 CXXCtorInitializer *Member) { 2289 if (!Member->isAnyMemberInitializer()) 2290 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2291 2292 // For fields injected into the class via declaration of an anonymous union, 2293 // use its anonymous union class declaration as the unique key. 2294 FieldDecl *Field = Member->getAnyMember(); 2295 2296 // If the field is a member of an anonymous struct or union, our key 2297 // is the anonymous record decl that's a direct child of the class. 2298 RecordDecl *RD = Field->getParent(); 2299 if (RD->isAnonymousStructOrUnion()) { 2300 while (true) { 2301 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2302 if (Parent->isAnonymousStructOrUnion()) 2303 RD = Parent; 2304 else 2305 break; 2306 } 2307 2308 return static_cast<void *>(RD); 2309 } 2310 2311 return static_cast<void *>(Field); 2312} 2313 2314static void 2315DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2316 const CXXConstructorDecl *Constructor, 2317 CXXCtorInitializer **Inits, 2318 unsigned NumInits) { 2319 if (Constructor->getDeclContext()->isDependentContext()) 2320 return; 2321 2322 // Don't check initializers order unless the warning is enabled at the 2323 // location of at least one initializer. 2324 bool ShouldCheckOrder = false; 2325 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2326 CXXCtorInitializer *Init = Inits[InitIndex]; 2327 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2328 Init->getSourceLocation()) 2329 != Diagnostic::Ignored) { 2330 ShouldCheckOrder = true; 2331 break; 2332 } 2333 } 2334 if (!ShouldCheckOrder) 2335 return; 2336 2337 // Build the list of bases and members in the order that they'll 2338 // actually be initialized. The explicit initializers should be in 2339 // this same order but may be missing things. 2340 llvm::SmallVector<const void*, 32> IdealInitKeys; 2341 2342 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2343 2344 // 1. Virtual bases. 2345 for (CXXRecordDecl::base_class_const_iterator VBase = 2346 ClassDecl->vbases_begin(), 2347 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2348 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2349 2350 // 2. Non-virtual bases. 2351 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2352 E = ClassDecl->bases_end(); Base != E; ++Base) { 2353 if (Base->isVirtual()) 2354 continue; 2355 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2356 } 2357 2358 // 3. Direct fields. 2359 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2360 E = ClassDecl->field_end(); Field != E; ++Field) 2361 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2362 2363 unsigned NumIdealInits = IdealInitKeys.size(); 2364 unsigned IdealIndex = 0; 2365 2366 CXXCtorInitializer *PrevInit = 0; 2367 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2368 CXXCtorInitializer *Init = Inits[InitIndex]; 2369 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2370 2371 // Scan forward to try to find this initializer in the idealized 2372 // initializers list. 2373 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2374 if (InitKey == IdealInitKeys[IdealIndex]) 2375 break; 2376 2377 // If we didn't find this initializer, it must be because we 2378 // scanned past it on a previous iteration. That can only 2379 // happen if we're out of order; emit a warning. 2380 if (IdealIndex == NumIdealInits && PrevInit) { 2381 Sema::SemaDiagnosticBuilder D = 2382 SemaRef.Diag(PrevInit->getSourceLocation(), 2383 diag::warn_initializer_out_of_order); 2384 2385 if (PrevInit->isAnyMemberInitializer()) 2386 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2387 else 2388 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2389 2390 if (Init->isAnyMemberInitializer()) 2391 D << 0 << Init->getAnyMember()->getDeclName(); 2392 else 2393 D << 1 << Init->getBaseClassInfo()->getType(); 2394 2395 // Move back to the initializer's location in the ideal list. 2396 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2397 if (InitKey == IdealInitKeys[IdealIndex]) 2398 break; 2399 2400 assert(IdealIndex != NumIdealInits && 2401 "initializer not found in initializer list"); 2402 } 2403 2404 PrevInit = Init; 2405 } 2406} 2407 2408namespace { 2409bool CheckRedundantInit(Sema &S, 2410 CXXCtorInitializer *Init, 2411 CXXCtorInitializer *&PrevInit) { 2412 if (!PrevInit) { 2413 PrevInit = Init; 2414 return false; 2415 } 2416 2417 if (FieldDecl *Field = Init->getMember()) 2418 S.Diag(Init->getSourceLocation(), 2419 diag::err_multiple_mem_initialization) 2420 << Field->getDeclName() 2421 << Init->getSourceRange(); 2422 else { 2423 const Type *BaseClass = Init->getBaseClass(); 2424 assert(BaseClass && "neither field nor base"); 2425 S.Diag(Init->getSourceLocation(), 2426 diag::err_multiple_base_initialization) 2427 << QualType(BaseClass, 0) 2428 << Init->getSourceRange(); 2429 } 2430 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2431 << 0 << PrevInit->getSourceRange(); 2432 2433 return true; 2434} 2435 2436typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2437typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2438 2439bool CheckRedundantUnionInit(Sema &S, 2440 CXXCtorInitializer *Init, 2441 RedundantUnionMap &Unions) { 2442 FieldDecl *Field = Init->getAnyMember(); 2443 RecordDecl *Parent = Field->getParent(); 2444 if (!Parent->isAnonymousStructOrUnion()) 2445 return false; 2446 2447 NamedDecl *Child = Field; 2448 do { 2449 if (Parent->isUnion()) { 2450 UnionEntry &En = Unions[Parent]; 2451 if (En.first && En.first != Child) { 2452 S.Diag(Init->getSourceLocation(), 2453 diag::err_multiple_mem_union_initialization) 2454 << Field->getDeclName() 2455 << Init->getSourceRange(); 2456 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2457 << 0 << En.second->getSourceRange(); 2458 return true; 2459 } else if (!En.first) { 2460 En.first = Child; 2461 En.second = Init; 2462 } 2463 } 2464 2465 Child = Parent; 2466 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2467 } while (Parent->isAnonymousStructOrUnion()); 2468 2469 return false; 2470} 2471} 2472 2473/// ActOnMemInitializers - Handle the member initializers for a constructor. 2474void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2475 SourceLocation ColonLoc, 2476 MemInitTy **meminits, unsigned NumMemInits, 2477 bool AnyErrors) { 2478 if (!ConstructorDecl) 2479 return; 2480 2481 AdjustDeclIfTemplate(ConstructorDecl); 2482 2483 CXXConstructorDecl *Constructor 2484 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2485 2486 if (!Constructor) { 2487 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2488 return; 2489 } 2490 2491 CXXCtorInitializer **MemInits = 2492 reinterpret_cast<CXXCtorInitializer **>(meminits); 2493 2494 // Mapping for the duplicate initializers check. 2495 // For member initializers, this is keyed with a FieldDecl*. 2496 // For base initializers, this is keyed with a Type*. 2497 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2498 2499 // Mapping for the inconsistent anonymous-union initializers check. 2500 RedundantUnionMap MemberUnions; 2501 2502 bool HadError = false; 2503 for (unsigned i = 0; i < NumMemInits; i++) { 2504 CXXCtorInitializer *Init = MemInits[i]; 2505 2506 // Set the source order index. 2507 Init->setSourceOrder(i); 2508 2509 if (Init->isAnyMemberInitializer()) { 2510 FieldDecl *Field = Init->getAnyMember(); 2511 if (CheckRedundantInit(*this, Init, Members[Field]) || 2512 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2513 HadError = true; 2514 } else if (Init->isBaseInitializer()) { 2515 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2516 if (CheckRedundantInit(*this, Init, Members[Key])) 2517 HadError = true; 2518 } else { 2519 assert(Init->isDelegatingInitializer()); 2520 // This must be the only initializer 2521 if (i != 0 || NumMemInits > 1) { 2522 Diag(MemInits[0]->getSourceLocation(), 2523 diag::err_delegating_initializer_alone) 2524 << MemInits[0]->getSourceRange(); 2525 HadError = true; 2526 // We will treat this as being the only initializer. 2527 } 2528 SetDelegatingInitializer(Constructor, MemInits[i]); 2529 // Return immediately as the initializer is set. 2530 return; 2531 } 2532 } 2533 2534 if (HadError) 2535 return; 2536 2537 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2538 2539 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2540} 2541 2542void 2543Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2544 CXXRecordDecl *ClassDecl) { 2545 // Ignore dependent contexts. 2546 if (ClassDecl->isDependentContext()) 2547 return; 2548 2549 // FIXME: all the access-control diagnostics are positioned on the 2550 // field/base declaration. That's probably good; that said, the 2551 // user might reasonably want to know why the destructor is being 2552 // emitted, and we currently don't say. 2553 2554 // Non-static data members. 2555 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2556 E = ClassDecl->field_end(); I != E; ++I) { 2557 FieldDecl *Field = *I; 2558 if (Field->isInvalidDecl()) 2559 continue; 2560 QualType FieldType = Context.getBaseElementType(Field->getType()); 2561 2562 const RecordType* RT = FieldType->getAs<RecordType>(); 2563 if (!RT) 2564 continue; 2565 2566 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2567 if (FieldClassDecl->isInvalidDecl()) 2568 continue; 2569 if (FieldClassDecl->hasTrivialDestructor()) 2570 continue; 2571 2572 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2573 assert(Dtor && "No dtor found for FieldClassDecl!"); 2574 CheckDestructorAccess(Field->getLocation(), Dtor, 2575 PDiag(diag::err_access_dtor_field) 2576 << Field->getDeclName() 2577 << FieldType); 2578 2579 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2580 } 2581 2582 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2583 2584 // Bases. 2585 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2586 E = ClassDecl->bases_end(); Base != E; ++Base) { 2587 // Bases are always records in a well-formed non-dependent class. 2588 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2589 2590 // Remember direct virtual bases. 2591 if (Base->isVirtual()) 2592 DirectVirtualBases.insert(RT); 2593 2594 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2595 // If our base class is invalid, we probably can't get its dtor anyway. 2596 if (BaseClassDecl->isInvalidDecl()) 2597 continue; 2598 // Ignore trivial destructors. 2599 if (BaseClassDecl->hasTrivialDestructor()) 2600 continue; 2601 2602 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2603 assert(Dtor && "No dtor found for BaseClassDecl!"); 2604 2605 // FIXME: caret should be on the start of the class name 2606 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2607 PDiag(diag::err_access_dtor_base) 2608 << Base->getType() 2609 << Base->getSourceRange()); 2610 2611 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2612 } 2613 2614 // Virtual bases. 2615 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2616 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2617 2618 // Bases are always records in a well-formed non-dependent class. 2619 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2620 2621 // Ignore direct virtual bases. 2622 if (DirectVirtualBases.count(RT)) 2623 continue; 2624 2625 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2626 // If our base class is invalid, we probably can't get its dtor anyway. 2627 if (BaseClassDecl->isInvalidDecl()) 2628 continue; 2629 // Ignore trivial destructors. 2630 if (BaseClassDecl->hasTrivialDestructor()) 2631 continue; 2632 2633 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2634 assert(Dtor && "No dtor found for BaseClassDecl!"); 2635 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2636 PDiag(diag::err_access_dtor_vbase) 2637 << VBase->getType()); 2638 2639 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2640 } 2641} 2642 2643void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2644 if (!CDtorDecl) 2645 return; 2646 2647 if (CXXConstructorDecl *Constructor 2648 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2649 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2650} 2651 2652bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2653 unsigned DiagID, AbstractDiagSelID SelID) { 2654 if (SelID == -1) 2655 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2656 else 2657 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2658} 2659 2660bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2661 const PartialDiagnostic &PD) { 2662 if (!getLangOptions().CPlusPlus) 2663 return false; 2664 2665 if (const ArrayType *AT = Context.getAsArrayType(T)) 2666 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2667 2668 if (const PointerType *PT = T->getAs<PointerType>()) { 2669 // Find the innermost pointer type. 2670 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2671 PT = T; 2672 2673 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2674 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2675 } 2676 2677 const RecordType *RT = T->getAs<RecordType>(); 2678 if (!RT) 2679 return false; 2680 2681 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2682 2683 // We can't answer whether something is abstract until it has a 2684 // definition. If it's currently being defined, we'll walk back 2685 // over all the declarations when we have a full definition. 2686 const CXXRecordDecl *Def = RD->getDefinition(); 2687 if (!Def || Def->isBeingDefined()) 2688 return false; 2689 2690 if (!RD->isAbstract()) 2691 return false; 2692 2693 Diag(Loc, PD) << RD->getDeclName(); 2694 DiagnoseAbstractType(RD); 2695 2696 return true; 2697} 2698 2699void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2700 // Check if we've already emitted the list of pure virtual functions 2701 // for this class. 2702 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2703 return; 2704 2705 CXXFinalOverriderMap FinalOverriders; 2706 RD->getFinalOverriders(FinalOverriders); 2707 2708 // Keep a set of seen pure methods so we won't diagnose the same method 2709 // more than once. 2710 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2711 2712 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2713 MEnd = FinalOverriders.end(); 2714 M != MEnd; 2715 ++M) { 2716 for (OverridingMethods::iterator SO = M->second.begin(), 2717 SOEnd = M->second.end(); 2718 SO != SOEnd; ++SO) { 2719 // C++ [class.abstract]p4: 2720 // A class is abstract if it contains or inherits at least one 2721 // pure virtual function for which the final overrider is pure 2722 // virtual. 2723 2724 // 2725 if (SO->second.size() != 1) 2726 continue; 2727 2728 if (!SO->second.front().Method->isPure()) 2729 continue; 2730 2731 if (!SeenPureMethods.insert(SO->second.front().Method)) 2732 continue; 2733 2734 Diag(SO->second.front().Method->getLocation(), 2735 diag::note_pure_virtual_function) 2736 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2737 } 2738 } 2739 2740 if (!PureVirtualClassDiagSet) 2741 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2742 PureVirtualClassDiagSet->insert(RD); 2743} 2744 2745namespace { 2746struct AbstractUsageInfo { 2747 Sema &S; 2748 CXXRecordDecl *Record; 2749 CanQualType AbstractType; 2750 bool Invalid; 2751 2752 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2753 : S(S), Record(Record), 2754 AbstractType(S.Context.getCanonicalType( 2755 S.Context.getTypeDeclType(Record))), 2756 Invalid(false) {} 2757 2758 void DiagnoseAbstractType() { 2759 if (Invalid) return; 2760 S.DiagnoseAbstractType(Record); 2761 Invalid = true; 2762 } 2763 2764 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2765}; 2766 2767struct CheckAbstractUsage { 2768 AbstractUsageInfo &Info; 2769 const NamedDecl *Ctx; 2770 2771 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2772 : Info(Info), Ctx(Ctx) {} 2773 2774 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2775 switch (TL.getTypeLocClass()) { 2776#define ABSTRACT_TYPELOC(CLASS, PARENT) 2777#define TYPELOC(CLASS, PARENT) \ 2778 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2779#include "clang/AST/TypeLocNodes.def" 2780 } 2781 } 2782 2783 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2784 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2785 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2786 if (!TL.getArg(I)) 2787 continue; 2788 2789 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2790 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2791 } 2792 } 2793 2794 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2795 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2796 } 2797 2798 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2799 // Visit the type parameters from a permissive context. 2800 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2801 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2802 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2803 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2804 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2805 // TODO: other template argument types? 2806 } 2807 } 2808 2809 // Visit pointee types from a permissive context. 2810#define CheckPolymorphic(Type) \ 2811 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2812 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2813 } 2814 CheckPolymorphic(PointerTypeLoc) 2815 CheckPolymorphic(ReferenceTypeLoc) 2816 CheckPolymorphic(MemberPointerTypeLoc) 2817 CheckPolymorphic(BlockPointerTypeLoc) 2818 2819 /// Handle all the types we haven't given a more specific 2820 /// implementation for above. 2821 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2822 // Every other kind of type that we haven't called out already 2823 // that has an inner type is either (1) sugar or (2) contains that 2824 // inner type in some way as a subobject. 2825 if (TypeLoc Next = TL.getNextTypeLoc()) 2826 return Visit(Next, Sel); 2827 2828 // If there's no inner type and we're in a permissive context, 2829 // don't diagnose. 2830 if (Sel == Sema::AbstractNone) return; 2831 2832 // Check whether the type matches the abstract type. 2833 QualType T = TL.getType(); 2834 if (T->isArrayType()) { 2835 Sel = Sema::AbstractArrayType; 2836 T = Info.S.Context.getBaseElementType(T); 2837 } 2838 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2839 if (CT != Info.AbstractType) return; 2840 2841 // It matched; do some magic. 2842 if (Sel == Sema::AbstractArrayType) { 2843 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2844 << T << TL.getSourceRange(); 2845 } else { 2846 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2847 << Sel << T << TL.getSourceRange(); 2848 } 2849 Info.DiagnoseAbstractType(); 2850 } 2851}; 2852 2853void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2854 Sema::AbstractDiagSelID Sel) { 2855 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2856} 2857 2858} 2859 2860/// Check for invalid uses of an abstract type in a method declaration. 2861static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2862 CXXMethodDecl *MD) { 2863 // No need to do the check on definitions, which require that 2864 // the return/param types be complete. 2865 if (MD->doesThisDeclarationHaveABody()) 2866 return; 2867 2868 // For safety's sake, just ignore it if we don't have type source 2869 // information. This should never happen for non-implicit methods, 2870 // but... 2871 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2872 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2873} 2874 2875/// Check for invalid uses of an abstract type within a class definition. 2876static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2877 CXXRecordDecl *RD) { 2878 for (CXXRecordDecl::decl_iterator 2879 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2880 Decl *D = *I; 2881 if (D->isImplicit()) continue; 2882 2883 // Methods and method templates. 2884 if (isa<CXXMethodDecl>(D)) { 2885 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2886 } else if (isa<FunctionTemplateDecl>(D)) { 2887 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2888 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2889 2890 // Fields and static variables. 2891 } else if (isa<FieldDecl>(D)) { 2892 FieldDecl *FD = cast<FieldDecl>(D); 2893 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2894 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2895 } else if (isa<VarDecl>(D)) { 2896 VarDecl *VD = cast<VarDecl>(D); 2897 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2898 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2899 2900 // Nested classes and class templates. 2901 } else if (isa<CXXRecordDecl>(D)) { 2902 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2903 } else if (isa<ClassTemplateDecl>(D)) { 2904 CheckAbstractClassUsage(Info, 2905 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2906 } 2907 } 2908} 2909 2910/// \brief Perform semantic checks on a class definition that has been 2911/// completing, introducing implicitly-declared members, checking for 2912/// abstract types, etc. 2913void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2914 if (!Record) 2915 return; 2916 2917 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2918 AbstractUsageInfo Info(*this, Record); 2919 CheckAbstractClassUsage(Info, Record); 2920 } 2921 2922 // If this is not an aggregate type and has no user-declared constructor, 2923 // complain about any non-static data members of reference or const scalar 2924 // type, since they will never get initializers. 2925 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2926 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2927 bool Complained = false; 2928 for (RecordDecl::field_iterator F = Record->field_begin(), 2929 FEnd = Record->field_end(); 2930 F != FEnd; ++F) { 2931 if (F->getType()->isReferenceType() || 2932 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2933 if (!Complained) { 2934 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2935 << Record->getTagKind() << Record; 2936 Complained = true; 2937 } 2938 2939 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2940 << F->getType()->isReferenceType() 2941 << F->getDeclName(); 2942 } 2943 } 2944 } 2945 2946 if (Record->isDynamicClass() && !Record->isDependentType()) 2947 DynamicClasses.push_back(Record); 2948 2949 if (Record->getIdentifier()) { 2950 // C++ [class.mem]p13: 2951 // If T is the name of a class, then each of the following shall have a 2952 // name different from T: 2953 // - every member of every anonymous union that is a member of class T. 2954 // 2955 // C++ [class.mem]p14: 2956 // In addition, if class T has a user-declared constructor (12.1), every 2957 // non-static data member of class T shall have a name different from T. 2958 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2959 R.first != R.second; ++R.first) { 2960 NamedDecl *D = *R.first; 2961 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2962 isa<IndirectFieldDecl>(D)) { 2963 Diag(D->getLocation(), diag::err_member_name_of_class) 2964 << D->getDeclName(); 2965 break; 2966 } 2967 } 2968 } 2969 2970 // Warn if the class has virtual methods but non-virtual public destructor. 2971 if (Record->isPolymorphic() && !Record->isDependentType()) { 2972 CXXDestructorDecl *dtor = Record->getDestructor(); 2973 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2974 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2975 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2976 } 2977 2978 // See if a method overloads virtual methods in a base 2979 /// class without overriding any. 2980 if (!Record->isDependentType()) { 2981 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2982 MEnd = Record->method_end(); 2983 M != MEnd; ++M) { 2984 if (!(*M)->isStatic()) 2985 DiagnoseHiddenVirtualMethods(Record, *M); 2986 } 2987 } 2988 2989 // Declare inherited constructors. We do this eagerly here because: 2990 // - The standard requires an eager diagnostic for conflicting inherited 2991 // constructors from different classes. 2992 // - The lazy declaration of the other implicit constructors is so as to not 2993 // waste space and performance on classes that are not meant to be 2994 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2995 // have inherited constructors. 2996 DeclareInheritedConstructors(Record); 2997 2998 CheckExplicitlyDefaultedMethods(Record); 2999} 3000 3001void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3002 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3003 ME = Record->method_end(); 3004 MI != ME; ++MI) { 3005 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3006 switch (getSpecialMember(*MI)) { 3007 case CXXDefaultConstructor: 3008 CheckExplicitlyDefaultedDefaultConstructor( 3009 cast<CXXConstructorDecl>(*MI)); 3010 break; 3011 3012 case CXXDestructor: 3013 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3014 break; 3015 3016 case CXXCopyConstructor: 3017 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3018 break; 3019 3020 case CXXCopyAssignment: 3021 // FIXME: Do copy assignment operators and moves 3022 break; 3023 3024 default: 3025 llvm_unreachable("non-special member explicitly defaulted!"); 3026 } 3027 } 3028 } 3029 3030} 3031 3032void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3033 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3034 3035 // Whether this was the first-declared instance of the constructor. 3036 // This affects whether we implicitly add an exception spec (and, eventually, 3037 // constexpr). It is also ill-formed to explicitly default a constructor such 3038 // that it would be deleted. (C++0x [decl.fct.def.default]) 3039 bool First = CD == CD->getCanonicalDecl(); 3040 3041 bool HadError = false; 3042 if (CD->getNumParams() != 0) { 3043 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3044 << CD->getSourceRange(); 3045 HadError = true; 3046 } 3047 3048 ImplicitExceptionSpecification Spec 3049 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3050 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3051 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3052 *ExceptionType = Context.getFunctionType( 3053 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3054 3055 if (CtorType->hasExceptionSpec()) { 3056 if (CheckEquivalentExceptionSpec( 3057 PDiag(diag::err_incorrect_defaulted_exception_spec) 3058 << 0 /* default constructor */, 3059 PDiag(), 3060 ExceptionType, SourceLocation(), 3061 CtorType, CD->getLocation())) { 3062 HadError = true; 3063 } 3064 } else if (First) { 3065 // We set the declaration to have the computed exception spec here. 3066 // We know there are no parameters. 3067 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3068 } 3069 3070 if (HadError) { 3071 CD->setInvalidDecl(); 3072 return; 3073 } 3074 3075 if (ShouldDeleteDefaultConstructor(CD)) { 3076 if (First) { 3077 CD->setDeletedAsWritten(); 3078 } else { 3079 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3080 << 0 /* default constructor */; 3081 CD->setInvalidDecl(); 3082 } 3083 } 3084} 3085 3086void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3087 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3088 3089 // Whether this was the first-declared instance of the constructor. 3090 bool First = CD == CD->getCanonicalDecl(); 3091 3092 bool HadError = false; 3093 if (CD->getNumParams() != 1) { 3094 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3095 << CD->getSourceRange(); 3096 HadError = true; 3097 } 3098 3099 ImplicitExceptionSpecification Spec(Context); 3100 bool Const; 3101 llvm::tie(Spec, Const) = 3102 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3103 3104 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3105 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3106 *ExceptionType = Context.getFunctionType( 3107 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3108 3109 // Check for parameter type matching. 3110 // This is a copy ctor so we know it's a cv-qualified reference to T. 3111 QualType ArgType = CtorType->getArgType(0); 3112 if (ArgType->getPointeeType().isVolatileQualified()) { 3113 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3114 HadError = true; 3115 } 3116 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3117 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3118 HadError = true; 3119 } 3120 3121 if (CtorType->hasExceptionSpec()) { 3122 if (CheckEquivalentExceptionSpec( 3123 PDiag(diag::err_incorrect_defaulted_exception_spec) 3124 << 1 /* copy constructor */, 3125 PDiag(), 3126 ExceptionType, SourceLocation(), 3127 CtorType, CD->getLocation())) { 3128 HadError = true; 3129 } 3130 } else if (First) { 3131 // We set the declaration to have the computed exception spec here. 3132 // We duplicate the one parameter type. 3133 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3134 } 3135 3136 if (HadError) { 3137 CD->setInvalidDecl(); 3138 return; 3139 } 3140 3141 if (ShouldDeleteCopyConstructor(CD)) { 3142 if (First) { 3143 CD->setDeletedAsWritten(); 3144 } else { 3145 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3146 << 1 /* copy constructor */; 3147 CD->setInvalidDecl(); 3148 } 3149 } 3150} 3151 3152void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3153 assert(DD->isExplicitlyDefaulted()); 3154 3155 // Whether this was the first-declared instance of the destructor. 3156 bool First = DD == DD->getCanonicalDecl(); 3157 3158 ImplicitExceptionSpecification Spec 3159 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3160 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3161 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3162 *ExceptionType = Context.getFunctionType( 3163 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3164 3165 if (DtorType->hasExceptionSpec()) { 3166 if (CheckEquivalentExceptionSpec( 3167 PDiag(diag::err_incorrect_defaulted_exception_spec) 3168 << 3 /* destructor */, 3169 PDiag(), 3170 ExceptionType, SourceLocation(), 3171 DtorType, DD->getLocation())) { 3172 DD->setInvalidDecl(); 3173 return; 3174 } 3175 } else if (First) { 3176 // We set the declaration to have the computed exception spec here. 3177 // There are no parameters. 3178 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3179 } 3180 3181 if (ShouldDeleteDestructor(DD)) { 3182 if (First) { 3183 DD->setDeletedAsWritten(); 3184 } else { 3185 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3186 << 3 /* destructor */; 3187 DD->setInvalidDecl(); 3188 } 3189 } 3190} 3191 3192bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3193 CXXRecordDecl *RD = CD->getParent(); 3194 assert(!RD->isDependentType() && "do deletion after instantiation"); 3195 if (!LangOpts.CPlusPlus0x) 3196 return false; 3197 3198 // Do access control from the constructor 3199 ContextRAII CtorContext(*this, CD); 3200 3201 bool Union = RD->isUnion(); 3202 bool AllConst = true; 3203 3204 // We do this because we should never actually use an anonymous 3205 // union's constructor. 3206 if (Union && RD->isAnonymousStructOrUnion()) 3207 return false; 3208 3209 // FIXME: We should put some diagnostic logic right into this function. 3210 3211 // C++0x [class.ctor]/5 3212 // A defaulted default constructor for class X is defined as delete if: 3213 3214 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3215 BE = RD->bases_end(); 3216 BI != BE; ++BI) { 3217 // We'll handle this one later 3218 if (BI->isVirtual()) 3219 continue; 3220 3221 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3222 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3223 3224 // -- any [direct base class] has a type with a destructor that is 3225 // delete or inaccessible from the defaulted default constructor 3226 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3227 if (BaseDtor->isDeleted()) 3228 return true; 3229 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3230 AR_accessible) 3231 return true; 3232 3233 // -- any [direct base class either] has no default constructor or 3234 // overload resolution as applied to [its] default constructor 3235 // results in an ambiguity or in a function that is deleted or 3236 // inaccessible from the defaulted default constructor 3237 InitializedEntity BaseEntity = 3238 InitializedEntity::InitializeBase(Context, BI, 0); 3239 InitializationKind Kind = 3240 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3241 SourceLocation()); 3242 3243 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3244 3245 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3246 return true; 3247 } 3248 3249 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3250 BE = RD->vbases_end(); 3251 BI != BE; ++BI) { 3252 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3253 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3254 3255 // -- any [virtual base class] has a type with a destructor that is 3256 // delete or inaccessible from the defaulted default constructor 3257 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3258 if (BaseDtor->isDeleted()) 3259 return true; 3260 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3261 AR_accessible) 3262 return true; 3263 3264 // -- any [virtual base class either] has no default constructor or 3265 // overload resolution as applied to [its] default constructor 3266 // results in an ambiguity or in a function that is deleted or 3267 // inaccessible from the defaulted default constructor 3268 InitializedEntity BaseEntity = 3269 InitializedEntity::InitializeBase(Context, BI, BI); 3270 InitializationKind Kind = 3271 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3272 SourceLocation()); 3273 3274 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3275 3276 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3277 return true; 3278 } 3279 3280 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3281 FE = RD->field_end(); 3282 FI != FE; ++FI) { 3283 QualType FieldType = Context.getBaseElementType(FI->getType()); 3284 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3285 3286 // -- any non-static data member with no brace-or-equal-initializer is of 3287 // reference type 3288 if (FieldType->isReferenceType()) 3289 return true; 3290 3291 // -- X is a union and all its variant members are of const-qualified type 3292 // (or array thereof) 3293 if (Union && !FieldType.isConstQualified()) 3294 AllConst = false; 3295 3296 if (FieldRecord) { 3297 // -- X is a union-like class that has a variant member with a non-trivial 3298 // default constructor 3299 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3300 return true; 3301 3302 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3303 if (FieldDtor->isDeleted()) 3304 return true; 3305 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3306 AR_accessible) 3307 return true; 3308 3309 // -- any non-variant non-static data member of const-qualified type (or 3310 // array thereof) with no brace-or-equal-initializer does not have a 3311 // user-provided default constructor 3312 if (FieldType.isConstQualified() && 3313 !FieldRecord->hasUserProvidedDefaultConstructor()) 3314 return true; 3315 3316 if (!Union && FieldRecord->isUnion() && 3317 FieldRecord->isAnonymousStructOrUnion()) { 3318 // We're okay to reuse AllConst here since we only care about the 3319 // value otherwise if we're in a union. 3320 AllConst = true; 3321 3322 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3323 UE = FieldRecord->field_end(); 3324 UI != UE; ++UI) { 3325 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3326 CXXRecordDecl *UnionFieldRecord = 3327 UnionFieldType->getAsCXXRecordDecl(); 3328 3329 if (!UnionFieldType.isConstQualified()) 3330 AllConst = false; 3331 3332 if (UnionFieldRecord && 3333 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3334 return true; 3335 } 3336 3337 if (AllConst) 3338 return true; 3339 3340 // Don't try to initialize the anonymous union 3341 // This is technically non-conformant, but sanity demands it. 3342 continue; 3343 } 3344 } 3345 3346 InitializedEntity MemberEntity = 3347 InitializedEntity::InitializeMember(*FI, 0); 3348 InitializationKind Kind = 3349 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3350 SourceLocation()); 3351 3352 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3353 3354 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3355 return true; 3356 } 3357 3358 if (Union && AllConst) 3359 return true; 3360 3361 return false; 3362} 3363 3364bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3365 CXXRecordDecl *RD = CD->getParent(); 3366 assert(!RD->isDependentType() && "do deletion after instantiation"); 3367 if (!LangOpts.CPlusPlus0x) 3368 return false; 3369 3370 // Do access control from the constructor 3371 ContextRAII CtorContext(*this, CD); 3372 3373 bool Union = RD->isUnion(); 3374 3375 bool ConstArg = CD->getParamDecl(0)->getType().isConstQualified(); 3376 3377 // We do this because we should never actually use an anonymous 3378 // union's constructor. 3379 if (Union && RD->isAnonymousStructOrUnion()) 3380 return false; 3381 3382 // FIXME: We should put some diagnostic logic right into this function. 3383 3384 // C++0x [class.copy]/11 3385 // A defaulted [copy] constructor for class X is defined as delete if X has: 3386 3387 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3388 BE = RD->bases_end(); 3389 BI != BE; ++BI) { 3390 // We'll handle this one later 3391 if (BI->isVirtual()) 3392 continue; 3393 3394 QualType BaseType = BI->getType(); 3395 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3396 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3397 3398 // -- any [direct base class] of a type with a destructor that is deleted or 3399 // inaccessible from the defaulted constructor 3400 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3401 if (BaseDtor->isDeleted()) 3402 return true; 3403 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3404 AR_accessible) 3405 return true; 3406 3407 // -- a [direct base class] B that cannot be [copied] because overload 3408 // resolution, as applied to B's [copy] constructor, results in an 3409 // ambiguity or a function that is deleted or inaccessible from the 3410 // defaulted constructor 3411 InitializedEntity BaseEntity = 3412 InitializedEntity::InitializeBase(Context, BI, 0); 3413 InitializationKind Kind = 3414 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3415 SourceLocation()); 3416 3417 // Construct a fake expression to perform the copy overloading. 3418 QualType ArgType = BaseType.getUnqualifiedType(); 3419 if (ArgType->isReferenceType()) 3420 ArgType = ArgType->getPointeeType(); 3421 if (ConstArg) 3422 ArgType.addConst(); 3423 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3424 VK_LValue); 3425 3426 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3427 3428 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3429 return true; 3430 } 3431 3432 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3433 BE = RD->vbases_end(); 3434 BI != BE; ++BI) { 3435 QualType BaseType = BI->getType(); 3436 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3437 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3438 3439 // -- any [direct base class] of a type with a destructor that is deleted or 3440 // inaccessible from the defaulted constructor 3441 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3442 if (BaseDtor->isDeleted()) 3443 return true; 3444 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3445 AR_accessible) 3446 return true; 3447 3448 // -- a [virtual base class] B that cannot be [copied] because overload 3449 // resolution, as applied to B's [copy] constructor, results in an 3450 // ambiguity or a function that is deleted or inaccessible from the 3451 // defaulted constructor 3452 InitializedEntity BaseEntity = 3453 InitializedEntity::InitializeBase(Context, BI, BI); 3454 InitializationKind Kind = 3455 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3456 SourceLocation()); 3457 3458 // Construct a fake expression to perform the copy overloading. 3459 QualType ArgType = BaseType.getUnqualifiedType(); 3460 if (ArgType->isReferenceType()) 3461 ArgType = ArgType->getPointeeType(); 3462 if (ConstArg) 3463 ArgType.addConst(); 3464 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3465 VK_LValue); 3466 3467 InitializationSequence InitSeq(*this, BaseEntity, Kind, &Arg, 1); 3468 3469 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3470 return true; 3471 } 3472 3473 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3474 FE = RD->field_end(); 3475 FI != FE; ++FI) { 3476 QualType FieldType = Context.getBaseElementType(FI->getType()); 3477 3478 // -- for a copy constructor, a non-static data member of rvalue reference 3479 // type 3480 if (FieldType->isRValueReferenceType()) 3481 return true; 3482 3483 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3484 3485 if (FieldRecord) { 3486 // This is an anonymous union 3487 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3488 // Anonymous unions inside unions do not variant members create 3489 if (!Union) { 3490 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3491 UE = FieldRecord->field_end(); 3492 UI != UE; ++UI) { 3493 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3494 CXXRecordDecl *UnionFieldRecord = 3495 UnionFieldType->getAsCXXRecordDecl(); 3496 3497 // -- a variant member with a non-trivial [copy] constructor and X 3498 // is a union-like class 3499 if (UnionFieldRecord && 3500 !UnionFieldRecord->hasTrivialCopyConstructor()) 3501 return true; 3502 } 3503 } 3504 3505 // Don't try to initalize an anonymous union 3506 continue; 3507 } else { 3508 // -- a variant member with a non-trivial [copy] constructor and X is a 3509 // union-like class 3510 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3511 return true; 3512 3513 // -- any [non-static data member] of a type with a destructor that is 3514 // deleted or inaccessible from the defaulted constructor 3515 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3516 if (FieldDtor->isDeleted()) 3517 return true; 3518 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3519 AR_accessible) 3520 return true; 3521 } 3522 } 3523 3524 llvm::SmallVector<InitializedEntity, 4> Entities; 3525 QualType CurType = FI->getType(); 3526 Entities.push_back(InitializedEntity::InitializeMember(*FI, 0)); 3527 while (CurType->isArrayType()) { 3528 Entities.push_back(InitializedEntity::InitializeElement(Context, 0, 3529 Entities.back())); 3530 CurType = Context.getAsArrayType(CurType)->getElementType(); 3531 } 3532 3533 InitializationKind Kind = 3534 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3535 SourceLocation()); 3536 3537 // Construct a fake expression to perform the copy overloading. 3538 QualType ArgType = FieldType; 3539 if (ArgType->isReferenceType()) 3540 ArgType = ArgType->getPointeeType(); 3541 if (ConstArg) 3542 ArgType.addConst(); 3543 Expr *Arg = new (Context) OpaqueValueExpr(SourceLocation(), ArgType, 3544 VK_LValue); 3545 3546 InitializationSequence InitSeq(*this, Entities.back(), Kind, &Arg, 1); 3547 3548 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3549 return true; 3550 } 3551 3552 return false; 3553} 3554 3555bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3556 CXXRecordDecl *RD = DD->getParent(); 3557 assert(!RD->isDependentType() && "do deletion after instantiation"); 3558 if (!LangOpts.CPlusPlus0x) 3559 return false; 3560 3561 // Do access control from the destructor 3562 ContextRAII CtorContext(*this, DD); 3563 3564 bool Union = RD->isUnion(); 3565 3566 // We do this because we should never actually use an anonymous 3567 // union's destructor. 3568 if (Union && RD->isAnonymousStructOrUnion()) 3569 return false; 3570 3571 // C++0x [class.dtor]p5 3572 // A defaulted destructor for a class X is defined as deleted if: 3573 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3574 BE = RD->bases_end(); 3575 BI != BE; ++BI) { 3576 // We'll handle this one later 3577 if (BI->isVirtual()) 3578 continue; 3579 3580 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3581 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3582 assert(BaseDtor && "base has no destructor"); 3583 3584 // -- any direct or virtual base class has a deleted destructor or 3585 // a destructor that is inaccessible from the defaulted destructor 3586 if (BaseDtor->isDeleted()) 3587 return true; 3588 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3589 AR_accessible) 3590 return true; 3591 } 3592 3593 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3594 BE = RD->vbases_end(); 3595 BI != BE; ++BI) { 3596 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3597 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3598 assert(BaseDtor && "base has no destructor"); 3599 3600 // -- any direct or virtual base class has a deleted destructor or 3601 // a destructor that is inaccessible from the defaulted destructor 3602 if (BaseDtor->isDeleted()) 3603 return true; 3604 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3605 AR_accessible) 3606 return true; 3607 } 3608 3609 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3610 FE = RD->field_end(); 3611 FI != FE; ++FI) { 3612 QualType FieldType = Context.getBaseElementType(FI->getType()); 3613 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3614 if (FieldRecord) { 3615 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3616 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3617 UE = FieldRecord->field_end(); 3618 UI != UE; ++UI) { 3619 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3620 CXXRecordDecl *UnionFieldRecord = 3621 UnionFieldType->getAsCXXRecordDecl(); 3622 3623 // -- X is a union-like class that has a variant member with a non- 3624 // trivial destructor. 3625 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3626 return true; 3627 } 3628 // Technically we are supposed to do this next check unconditionally. 3629 // But that makes absolutely no sense. 3630 } else { 3631 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3632 3633 // -- any of the non-static data members has class type M (or array 3634 // thereof) and M has a deleted destructor or a destructor that is 3635 // inaccessible from the defaulted destructor 3636 if (FieldDtor->isDeleted()) 3637 return true; 3638 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3639 AR_accessible) 3640 return true; 3641 3642 // -- X is a union-like class that has a variant member with a non- 3643 // trivial destructor. 3644 if (Union && !FieldDtor->isTrivial()) 3645 return true; 3646 } 3647 } 3648 } 3649 3650 if (DD->isVirtual()) { 3651 FunctionDecl *OperatorDelete = 0; 3652 DeclarationName Name = 3653 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3654 if (FindDeallocationFunction(SourceLocation(), RD, Name, OperatorDelete, 3655 false)) 3656 return true; 3657 } 3658 3659 3660 return false; 3661} 3662 3663/// \brief Data used with FindHiddenVirtualMethod 3664namespace { 3665 struct FindHiddenVirtualMethodData { 3666 Sema *S; 3667 CXXMethodDecl *Method; 3668 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3669 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3670 }; 3671} 3672 3673/// \brief Member lookup function that determines whether a given C++ 3674/// method overloads virtual methods in a base class without overriding any, 3675/// to be used with CXXRecordDecl::lookupInBases(). 3676static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3677 CXXBasePath &Path, 3678 void *UserData) { 3679 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3680 3681 FindHiddenVirtualMethodData &Data 3682 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3683 3684 DeclarationName Name = Data.Method->getDeclName(); 3685 assert(Name.getNameKind() == DeclarationName::Identifier); 3686 3687 bool foundSameNameMethod = false; 3688 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3689 for (Path.Decls = BaseRecord->lookup(Name); 3690 Path.Decls.first != Path.Decls.second; 3691 ++Path.Decls.first) { 3692 NamedDecl *D = *Path.Decls.first; 3693 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3694 MD = MD->getCanonicalDecl(); 3695 foundSameNameMethod = true; 3696 // Interested only in hidden virtual methods. 3697 if (!MD->isVirtual()) 3698 continue; 3699 // If the method we are checking overrides a method from its base 3700 // don't warn about the other overloaded methods. 3701 if (!Data.S->IsOverload(Data.Method, MD, false)) 3702 return true; 3703 // Collect the overload only if its hidden. 3704 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3705 overloadedMethods.push_back(MD); 3706 } 3707 } 3708 3709 if (foundSameNameMethod) 3710 Data.OverloadedMethods.append(overloadedMethods.begin(), 3711 overloadedMethods.end()); 3712 return foundSameNameMethod; 3713} 3714 3715/// \brief See if a method overloads virtual methods in a base class without 3716/// overriding any. 3717void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3718 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 3719 MD->getLocation()) == Diagnostic::Ignored) 3720 return; 3721 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 3722 return; 3723 3724 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3725 /*bool RecordPaths=*/false, 3726 /*bool DetectVirtual=*/false); 3727 FindHiddenVirtualMethodData Data; 3728 Data.Method = MD; 3729 Data.S = this; 3730 3731 // Keep the base methods that were overriden or introduced in the subclass 3732 // by 'using' in a set. A base method not in this set is hidden. 3733 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3734 res.first != res.second; ++res.first) { 3735 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3736 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3737 E = MD->end_overridden_methods(); 3738 I != E; ++I) 3739 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3740 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3741 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3742 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3743 } 3744 3745 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3746 !Data.OverloadedMethods.empty()) { 3747 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3748 << MD << (Data.OverloadedMethods.size() > 1); 3749 3750 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3751 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3752 Diag(overloadedMD->getLocation(), 3753 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3754 } 3755 } 3756} 3757 3758void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3759 Decl *TagDecl, 3760 SourceLocation LBrac, 3761 SourceLocation RBrac, 3762 AttributeList *AttrList) { 3763 if (!TagDecl) 3764 return; 3765 3766 AdjustDeclIfTemplate(TagDecl); 3767 3768 ActOnFields(S, RLoc, TagDecl, 3769 // strict aliasing violation! 3770 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3771 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3772 3773 CheckCompletedCXXClass( 3774 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3775} 3776 3777/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3778/// special functions, such as the default constructor, copy 3779/// constructor, or destructor, to the given C++ class (C++ 3780/// [special]p1). This routine can only be executed just before the 3781/// definition of the class is complete. 3782void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3783 if (!ClassDecl->hasUserDeclaredConstructor()) 3784 ++ASTContext::NumImplicitDefaultConstructors; 3785 3786 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3787 ++ASTContext::NumImplicitCopyConstructors; 3788 3789 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3790 ++ASTContext::NumImplicitCopyAssignmentOperators; 3791 3792 // If we have a dynamic class, then the copy assignment operator may be 3793 // virtual, so we have to declare it immediately. This ensures that, e.g., 3794 // it shows up in the right place in the vtable and that we diagnose 3795 // problems with the implicit exception specification. 3796 if (ClassDecl->isDynamicClass()) 3797 DeclareImplicitCopyAssignment(ClassDecl); 3798 } 3799 3800 if (!ClassDecl->hasUserDeclaredDestructor()) { 3801 ++ASTContext::NumImplicitDestructors; 3802 3803 // If we have a dynamic class, then the destructor may be virtual, so we 3804 // have to declare the destructor immediately. This ensures that, e.g., it 3805 // shows up in the right place in the vtable and that we diagnose problems 3806 // with the implicit exception specification. 3807 if (ClassDecl->isDynamicClass()) 3808 DeclareImplicitDestructor(ClassDecl); 3809 } 3810} 3811 3812void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3813 if (!D) 3814 return; 3815 3816 int NumParamList = D->getNumTemplateParameterLists(); 3817 for (int i = 0; i < NumParamList; i++) { 3818 TemplateParameterList* Params = D->getTemplateParameterList(i); 3819 for (TemplateParameterList::iterator Param = Params->begin(), 3820 ParamEnd = Params->end(); 3821 Param != ParamEnd; ++Param) { 3822 NamedDecl *Named = cast<NamedDecl>(*Param); 3823 if (Named->getDeclName()) { 3824 S->AddDecl(Named); 3825 IdResolver.AddDecl(Named); 3826 } 3827 } 3828 } 3829} 3830 3831void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3832 if (!D) 3833 return; 3834 3835 TemplateParameterList *Params = 0; 3836 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3837 Params = Template->getTemplateParameters(); 3838 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3839 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3840 Params = PartialSpec->getTemplateParameters(); 3841 else 3842 return; 3843 3844 for (TemplateParameterList::iterator Param = Params->begin(), 3845 ParamEnd = Params->end(); 3846 Param != ParamEnd; ++Param) { 3847 NamedDecl *Named = cast<NamedDecl>(*Param); 3848 if (Named->getDeclName()) { 3849 S->AddDecl(Named); 3850 IdResolver.AddDecl(Named); 3851 } 3852 } 3853} 3854 3855void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3856 if (!RecordD) return; 3857 AdjustDeclIfTemplate(RecordD); 3858 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3859 PushDeclContext(S, Record); 3860} 3861 3862void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3863 if (!RecordD) return; 3864 PopDeclContext(); 3865} 3866 3867/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3868/// parsing a top-level (non-nested) C++ class, and we are now 3869/// parsing those parts of the given Method declaration that could 3870/// not be parsed earlier (C++ [class.mem]p2), such as default 3871/// arguments. This action should enter the scope of the given 3872/// Method declaration as if we had just parsed the qualified method 3873/// name. However, it should not bring the parameters into scope; 3874/// that will be performed by ActOnDelayedCXXMethodParameter. 3875void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3876} 3877 3878/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3879/// C++ method declaration. We're (re-)introducing the given 3880/// function parameter into scope for use in parsing later parts of 3881/// the method declaration. For example, we could see an 3882/// ActOnParamDefaultArgument event for this parameter. 3883void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3884 if (!ParamD) 3885 return; 3886 3887 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3888 3889 // If this parameter has an unparsed default argument, clear it out 3890 // to make way for the parsed default argument. 3891 if (Param->hasUnparsedDefaultArg()) 3892 Param->setDefaultArg(0); 3893 3894 S->AddDecl(Param); 3895 if (Param->getDeclName()) 3896 IdResolver.AddDecl(Param); 3897} 3898 3899/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3900/// processing the delayed method declaration for Method. The method 3901/// declaration is now considered finished. There may be a separate 3902/// ActOnStartOfFunctionDef action later (not necessarily 3903/// immediately!) for this method, if it was also defined inside the 3904/// class body. 3905void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3906 if (!MethodD) 3907 return; 3908 3909 AdjustDeclIfTemplate(MethodD); 3910 3911 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3912 3913 // Now that we have our default arguments, check the constructor 3914 // again. It could produce additional diagnostics or affect whether 3915 // the class has implicitly-declared destructors, among other 3916 // things. 3917 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3918 CheckConstructor(Constructor); 3919 3920 // Check the default arguments, which we may have added. 3921 if (!Method->isInvalidDecl()) 3922 CheckCXXDefaultArguments(Method); 3923} 3924 3925/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3926/// the well-formedness of the constructor declarator @p D with type @p 3927/// R. If there are any errors in the declarator, this routine will 3928/// emit diagnostics and set the invalid bit to true. In any case, the type 3929/// will be updated to reflect a well-formed type for the constructor and 3930/// returned. 3931QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3932 StorageClass &SC) { 3933 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3934 3935 // C++ [class.ctor]p3: 3936 // A constructor shall not be virtual (10.3) or static (9.4). A 3937 // constructor can be invoked for a const, volatile or const 3938 // volatile object. A constructor shall not be declared const, 3939 // volatile, or const volatile (9.3.2). 3940 if (isVirtual) { 3941 if (!D.isInvalidType()) 3942 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3943 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3944 << SourceRange(D.getIdentifierLoc()); 3945 D.setInvalidType(); 3946 } 3947 if (SC == SC_Static) { 3948 if (!D.isInvalidType()) 3949 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3950 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3951 << SourceRange(D.getIdentifierLoc()); 3952 D.setInvalidType(); 3953 SC = SC_None; 3954 } 3955 3956 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3957 if (FTI.TypeQuals != 0) { 3958 if (FTI.TypeQuals & Qualifiers::Const) 3959 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3960 << "const" << SourceRange(D.getIdentifierLoc()); 3961 if (FTI.TypeQuals & Qualifiers::Volatile) 3962 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3963 << "volatile" << SourceRange(D.getIdentifierLoc()); 3964 if (FTI.TypeQuals & Qualifiers::Restrict) 3965 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3966 << "restrict" << SourceRange(D.getIdentifierLoc()); 3967 D.setInvalidType(); 3968 } 3969 3970 // C++0x [class.ctor]p4: 3971 // A constructor shall not be declared with a ref-qualifier. 3972 if (FTI.hasRefQualifier()) { 3973 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3974 << FTI.RefQualifierIsLValueRef 3975 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3976 D.setInvalidType(); 3977 } 3978 3979 // Rebuild the function type "R" without any type qualifiers (in 3980 // case any of the errors above fired) and with "void" as the 3981 // return type, since constructors don't have return types. 3982 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3983 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3984 return R; 3985 3986 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3987 EPI.TypeQuals = 0; 3988 EPI.RefQualifier = RQ_None; 3989 3990 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3991 Proto->getNumArgs(), EPI); 3992} 3993 3994/// CheckConstructor - Checks a fully-formed constructor for 3995/// well-formedness, issuing any diagnostics required. Returns true if 3996/// the constructor declarator is invalid. 3997void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3998 CXXRecordDecl *ClassDecl 3999 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4000 if (!ClassDecl) 4001 return Constructor->setInvalidDecl(); 4002 4003 // C++ [class.copy]p3: 4004 // A declaration of a constructor for a class X is ill-formed if 4005 // its first parameter is of type (optionally cv-qualified) X and 4006 // either there are no other parameters or else all other 4007 // parameters have default arguments. 4008 if (!Constructor->isInvalidDecl() && 4009 ((Constructor->getNumParams() == 1) || 4010 (Constructor->getNumParams() > 1 && 4011 Constructor->getParamDecl(1)->hasDefaultArg())) && 4012 Constructor->getTemplateSpecializationKind() 4013 != TSK_ImplicitInstantiation) { 4014 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4015 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4016 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4017 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4018 const char *ConstRef 4019 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4020 : " const &"; 4021 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4022 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4023 4024 // FIXME: Rather that making the constructor invalid, we should endeavor 4025 // to fix the type. 4026 Constructor->setInvalidDecl(); 4027 } 4028 } 4029} 4030 4031/// CheckDestructor - Checks a fully-formed destructor definition for 4032/// well-formedness, issuing any diagnostics required. Returns true 4033/// on error. 4034bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4035 CXXRecordDecl *RD = Destructor->getParent(); 4036 4037 if (Destructor->isVirtual()) { 4038 SourceLocation Loc; 4039 4040 if (!Destructor->isImplicit()) 4041 Loc = Destructor->getLocation(); 4042 else 4043 Loc = RD->getLocation(); 4044 4045 // If we have a virtual destructor, look up the deallocation function 4046 FunctionDecl *OperatorDelete = 0; 4047 DeclarationName Name = 4048 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4049 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4050 return true; 4051 4052 MarkDeclarationReferenced(Loc, OperatorDelete); 4053 4054 Destructor->setOperatorDelete(OperatorDelete); 4055 } 4056 4057 return false; 4058} 4059 4060static inline bool 4061FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4062 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4063 FTI.ArgInfo[0].Param && 4064 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4065} 4066 4067/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4068/// the well-formednes of the destructor declarator @p D with type @p 4069/// R. If there are any errors in the declarator, this routine will 4070/// emit diagnostics and set the declarator to invalid. Even if this happens, 4071/// will be updated to reflect a well-formed type for the destructor and 4072/// returned. 4073QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4074 StorageClass& SC) { 4075 // C++ [class.dtor]p1: 4076 // [...] A typedef-name that names a class is a class-name 4077 // (7.1.3); however, a typedef-name that names a class shall not 4078 // be used as the identifier in the declarator for a destructor 4079 // declaration. 4080 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4081 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4082 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4083 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4084 else if (const TemplateSpecializationType *TST = 4085 DeclaratorType->getAs<TemplateSpecializationType>()) 4086 if (TST->isTypeAlias()) 4087 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4088 << DeclaratorType << 1; 4089 4090 // C++ [class.dtor]p2: 4091 // A destructor is used to destroy objects of its class type. A 4092 // destructor takes no parameters, and no return type can be 4093 // specified for it (not even void). The address of a destructor 4094 // shall not be taken. A destructor shall not be static. A 4095 // destructor can be invoked for a const, volatile or const 4096 // volatile object. A destructor shall not be declared const, 4097 // volatile or const volatile (9.3.2). 4098 if (SC == SC_Static) { 4099 if (!D.isInvalidType()) 4100 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4101 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4102 << SourceRange(D.getIdentifierLoc()) 4103 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4104 4105 SC = SC_None; 4106 } 4107 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4108 // Destructors don't have return types, but the parser will 4109 // happily parse something like: 4110 // 4111 // class X { 4112 // float ~X(); 4113 // }; 4114 // 4115 // The return type will be eliminated later. 4116 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4117 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4118 << SourceRange(D.getIdentifierLoc()); 4119 } 4120 4121 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4122 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4123 if (FTI.TypeQuals & Qualifiers::Const) 4124 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4125 << "const" << SourceRange(D.getIdentifierLoc()); 4126 if (FTI.TypeQuals & Qualifiers::Volatile) 4127 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4128 << "volatile" << SourceRange(D.getIdentifierLoc()); 4129 if (FTI.TypeQuals & Qualifiers::Restrict) 4130 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4131 << "restrict" << SourceRange(D.getIdentifierLoc()); 4132 D.setInvalidType(); 4133 } 4134 4135 // C++0x [class.dtor]p2: 4136 // A destructor shall not be declared with a ref-qualifier. 4137 if (FTI.hasRefQualifier()) { 4138 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4139 << FTI.RefQualifierIsLValueRef 4140 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4141 D.setInvalidType(); 4142 } 4143 4144 // Make sure we don't have any parameters. 4145 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4146 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4147 4148 // Delete the parameters. 4149 FTI.freeArgs(); 4150 D.setInvalidType(); 4151 } 4152 4153 // Make sure the destructor isn't variadic. 4154 if (FTI.isVariadic) { 4155 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4156 D.setInvalidType(); 4157 } 4158 4159 // Rebuild the function type "R" without any type qualifiers or 4160 // parameters (in case any of the errors above fired) and with 4161 // "void" as the return type, since destructors don't have return 4162 // types. 4163 if (!D.isInvalidType()) 4164 return R; 4165 4166 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4167 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4168 EPI.Variadic = false; 4169 EPI.TypeQuals = 0; 4170 EPI.RefQualifier = RQ_None; 4171 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4172} 4173 4174/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4175/// well-formednes of the conversion function declarator @p D with 4176/// type @p R. If there are any errors in the declarator, this routine 4177/// will emit diagnostics and return true. Otherwise, it will return 4178/// false. Either way, the type @p R will be updated to reflect a 4179/// well-formed type for the conversion operator. 4180void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4181 StorageClass& SC) { 4182 // C++ [class.conv.fct]p1: 4183 // Neither parameter types nor return type can be specified. The 4184 // type of a conversion function (8.3.5) is "function taking no 4185 // parameter returning conversion-type-id." 4186 if (SC == SC_Static) { 4187 if (!D.isInvalidType()) 4188 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4189 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4190 << SourceRange(D.getIdentifierLoc()); 4191 D.setInvalidType(); 4192 SC = SC_None; 4193 } 4194 4195 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4196 4197 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4198 // Conversion functions don't have return types, but the parser will 4199 // happily parse something like: 4200 // 4201 // class X { 4202 // float operator bool(); 4203 // }; 4204 // 4205 // The return type will be changed later anyway. 4206 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4207 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4208 << SourceRange(D.getIdentifierLoc()); 4209 D.setInvalidType(); 4210 } 4211 4212 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4213 4214 // Make sure we don't have any parameters. 4215 if (Proto->getNumArgs() > 0) { 4216 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4217 4218 // Delete the parameters. 4219 D.getFunctionTypeInfo().freeArgs(); 4220 D.setInvalidType(); 4221 } else if (Proto->isVariadic()) { 4222 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4223 D.setInvalidType(); 4224 } 4225 4226 // Diagnose "&operator bool()" and other such nonsense. This 4227 // is actually a gcc extension which we don't support. 4228 if (Proto->getResultType() != ConvType) { 4229 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4230 << Proto->getResultType(); 4231 D.setInvalidType(); 4232 ConvType = Proto->getResultType(); 4233 } 4234 4235 // C++ [class.conv.fct]p4: 4236 // The conversion-type-id shall not represent a function type nor 4237 // an array type. 4238 if (ConvType->isArrayType()) { 4239 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4240 ConvType = Context.getPointerType(ConvType); 4241 D.setInvalidType(); 4242 } else if (ConvType->isFunctionType()) { 4243 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4244 ConvType = Context.getPointerType(ConvType); 4245 D.setInvalidType(); 4246 } 4247 4248 // Rebuild the function type "R" without any parameters (in case any 4249 // of the errors above fired) and with the conversion type as the 4250 // return type. 4251 if (D.isInvalidType()) 4252 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4253 4254 // C++0x explicit conversion operators. 4255 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4256 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4257 diag::warn_explicit_conversion_functions) 4258 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4259} 4260 4261/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4262/// the declaration of the given C++ conversion function. This routine 4263/// is responsible for recording the conversion function in the C++ 4264/// class, if possible. 4265Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4266 assert(Conversion && "Expected to receive a conversion function declaration"); 4267 4268 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4269 4270 // Make sure we aren't redeclaring the conversion function. 4271 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4272 4273 // C++ [class.conv.fct]p1: 4274 // [...] A conversion function is never used to convert a 4275 // (possibly cv-qualified) object to the (possibly cv-qualified) 4276 // same object type (or a reference to it), to a (possibly 4277 // cv-qualified) base class of that type (or a reference to it), 4278 // or to (possibly cv-qualified) void. 4279 // FIXME: Suppress this warning if the conversion function ends up being a 4280 // virtual function that overrides a virtual function in a base class. 4281 QualType ClassType 4282 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4283 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4284 ConvType = ConvTypeRef->getPointeeType(); 4285 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4286 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4287 /* Suppress diagnostics for instantiations. */; 4288 else if (ConvType->isRecordType()) { 4289 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4290 if (ConvType == ClassType) 4291 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4292 << ClassType; 4293 else if (IsDerivedFrom(ClassType, ConvType)) 4294 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4295 << ClassType << ConvType; 4296 } else if (ConvType->isVoidType()) { 4297 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4298 << ClassType << ConvType; 4299 } 4300 4301 if (FunctionTemplateDecl *ConversionTemplate 4302 = Conversion->getDescribedFunctionTemplate()) 4303 return ConversionTemplate; 4304 4305 return Conversion; 4306} 4307 4308//===----------------------------------------------------------------------===// 4309// Namespace Handling 4310//===----------------------------------------------------------------------===// 4311 4312 4313 4314/// ActOnStartNamespaceDef - This is called at the start of a namespace 4315/// definition. 4316Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4317 SourceLocation InlineLoc, 4318 SourceLocation NamespaceLoc, 4319 SourceLocation IdentLoc, 4320 IdentifierInfo *II, 4321 SourceLocation LBrace, 4322 AttributeList *AttrList) { 4323 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4324 // For anonymous namespace, take the location of the left brace. 4325 SourceLocation Loc = II ? IdentLoc : LBrace; 4326 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4327 StartLoc, Loc, II); 4328 Namespc->setInline(InlineLoc.isValid()); 4329 4330 Scope *DeclRegionScope = NamespcScope->getParent(); 4331 4332 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4333 4334 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4335 PushNamespaceVisibilityAttr(Attr); 4336 4337 if (II) { 4338 // C++ [namespace.def]p2: 4339 // The identifier in an original-namespace-definition shall not 4340 // have been previously defined in the declarative region in 4341 // which the original-namespace-definition appears. The 4342 // identifier in an original-namespace-definition is the name of 4343 // the namespace. Subsequently in that declarative region, it is 4344 // treated as an original-namespace-name. 4345 // 4346 // Since namespace names are unique in their scope, and we don't 4347 // look through using directives, just look for any ordinary names. 4348 4349 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4350 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4351 Decl::IDNS_Namespace; 4352 NamedDecl *PrevDecl = 0; 4353 for (DeclContext::lookup_result R 4354 = CurContext->getRedeclContext()->lookup(II); 4355 R.first != R.second; ++R.first) { 4356 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4357 PrevDecl = *R.first; 4358 break; 4359 } 4360 } 4361 4362 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4363 // This is an extended namespace definition. 4364 if (Namespc->isInline() != OrigNS->isInline()) { 4365 // inline-ness must match 4366 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4367 << Namespc->isInline(); 4368 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4369 Namespc->setInvalidDecl(); 4370 // Recover by ignoring the new namespace's inline status. 4371 Namespc->setInline(OrigNS->isInline()); 4372 } 4373 4374 // Attach this namespace decl to the chain of extended namespace 4375 // definitions. 4376 OrigNS->setNextNamespace(Namespc); 4377 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4378 4379 // Remove the previous declaration from the scope. 4380 if (DeclRegionScope->isDeclScope(OrigNS)) { 4381 IdResolver.RemoveDecl(OrigNS); 4382 DeclRegionScope->RemoveDecl(OrigNS); 4383 } 4384 } else if (PrevDecl) { 4385 // This is an invalid name redefinition. 4386 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4387 << Namespc->getDeclName(); 4388 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4389 Namespc->setInvalidDecl(); 4390 // Continue on to push Namespc as current DeclContext and return it. 4391 } else if (II->isStr("std") && 4392 CurContext->getRedeclContext()->isTranslationUnit()) { 4393 // This is the first "real" definition of the namespace "std", so update 4394 // our cache of the "std" namespace to point at this definition. 4395 if (NamespaceDecl *StdNS = getStdNamespace()) { 4396 // We had already defined a dummy namespace "std". Link this new 4397 // namespace definition to the dummy namespace "std". 4398 StdNS->setNextNamespace(Namespc); 4399 StdNS->setLocation(IdentLoc); 4400 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4401 } 4402 4403 // Make our StdNamespace cache point at the first real definition of the 4404 // "std" namespace. 4405 StdNamespace = Namespc; 4406 } 4407 4408 PushOnScopeChains(Namespc, DeclRegionScope); 4409 } else { 4410 // Anonymous namespaces. 4411 assert(Namespc->isAnonymousNamespace()); 4412 4413 // Link the anonymous namespace into its parent. 4414 NamespaceDecl *PrevDecl; 4415 DeclContext *Parent = CurContext->getRedeclContext(); 4416 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4417 PrevDecl = TU->getAnonymousNamespace(); 4418 TU->setAnonymousNamespace(Namespc); 4419 } else { 4420 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4421 PrevDecl = ND->getAnonymousNamespace(); 4422 ND->setAnonymousNamespace(Namespc); 4423 } 4424 4425 // Link the anonymous namespace with its previous declaration. 4426 if (PrevDecl) { 4427 assert(PrevDecl->isAnonymousNamespace()); 4428 assert(!PrevDecl->getNextNamespace()); 4429 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4430 PrevDecl->setNextNamespace(Namespc); 4431 4432 if (Namespc->isInline() != PrevDecl->isInline()) { 4433 // inline-ness must match 4434 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4435 << Namespc->isInline(); 4436 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4437 Namespc->setInvalidDecl(); 4438 // Recover by ignoring the new namespace's inline status. 4439 Namespc->setInline(PrevDecl->isInline()); 4440 } 4441 } 4442 4443 CurContext->addDecl(Namespc); 4444 4445 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4446 // behaves as if it were replaced by 4447 // namespace unique { /* empty body */ } 4448 // using namespace unique; 4449 // namespace unique { namespace-body } 4450 // where all occurrences of 'unique' in a translation unit are 4451 // replaced by the same identifier and this identifier differs 4452 // from all other identifiers in the entire program. 4453 4454 // We just create the namespace with an empty name and then add an 4455 // implicit using declaration, just like the standard suggests. 4456 // 4457 // CodeGen enforces the "universally unique" aspect by giving all 4458 // declarations semantically contained within an anonymous 4459 // namespace internal linkage. 4460 4461 if (!PrevDecl) { 4462 UsingDirectiveDecl* UD 4463 = UsingDirectiveDecl::Create(Context, CurContext, 4464 /* 'using' */ LBrace, 4465 /* 'namespace' */ SourceLocation(), 4466 /* qualifier */ NestedNameSpecifierLoc(), 4467 /* identifier */ SourceLocation(), 4468 Namespc, 4469 /* Ancestor */ CurContext); 4470 UD->setImplicit(); 4471 CurContext->addDecl(UD); 4472 } 4473 } 4474 4475 // Although we could have an invalid decl (i.e. the namespace name is a 4476 // redefinition), push it as current DeclContext and try to continue parsing. 4477 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4478 // for the namespace has the declarations that showed up in that particular 4479 // namespace definition. 4480 PushDeclContext(NamespcScope, Namespc); 4481 return Namespc; 4482} 4483 4484/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4485/// is a namespace alias, returns the namespace it points to. 4486static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4487 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4488 return AD->getNamespace(); 4489 return dyn_cast_or_null<NamespaceDecl>(D); 4490} 4491 4492/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4493/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4494void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4495 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4496 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4497 Namespc->setRBraceLoc(RBrace); 4498 PopDeclContext(); 4499 if (Namespc->hasAttr<VisibilityAttr>()) 4500 PopPragmaVisibility(); 4501} 4502 4503CXXRecordDecl *Sema::getStdBadAlloc() const { 4504 return cast_or_null<CXXRecordDecl>( 4505 StdBadAlloc.get(Context.getExternalSource())); 4506} 4507 4508NamespaceDecl *Sema::getStdNamespace() const { 4509 return cast_or_null<NamespaceDecl>( 4510 StdNamespace.get(Context.getExternalSource())); 4511} 4512 4513/// \brief Retrieve the special "std" namespace, which may require us to 4514/// implicitly define the namespace. 4515NamespaceDecl *Sema::getOrCreateStdNamespace() { 4516 if (!StdNamespace) { 4517 // The "std" namespace has not yet been defined, so build one implicitly. 4518 StdNamespace = NamespaceDecl::Create(Context, 4519 Context.getTranslationUnitDecl(), 4520 SourceLocation(), SourceLocation(), 4521 &PP.getIdentifierTable().get("std")); 4522 getStdNamespace()->setImplicit(true); 4523 } 4524 4525 return getStdNamespace(); 4526} 4527 4528/// \brief Determine whether a using statement is in a context where it will be 4529/// apply in all contexts. 4530static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4531 switch (CurContext->getDeclKind()) { 4532 case Decl::TranslationUnit: 4533 return true; 4534 case Decl::LinkageSpec: 4535 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4536 default: 4537 return false; 4538 } 4539} 4540 4541Decl *Sema::ActOnUsingDirective(Scope *S, 4542 SourceLocation UsingLoc, 4543 SourceLocation NamespcLoc, 4544 CXXScopeSpec &SS, 4545 SourceLocation IdentLoc, 4546 IdentifierInfo *NamespcName, 4547 AttributeList *AttrList) { 4548 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4549 assert(NamespcName && "Invalid NamespcName."); 4550 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4551 4552 // This can only happen along a recovery path. 4553 while (S->getFlags() & Scope::TemplateParamScope) 4554 S = S->getParent(); 4555 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4556 4557 UsingDirectiveDecl *UDir = 0; 4558 NestedNameSpecifier *Qualifier = 0; 4559 if (SS.isSet()) 4560 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4561 4562 // Lookup namespace name. 4563 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4564 LookupParsedName(R, S, &SS); 4565 if (R.isAmbiguous()) 4566 return 0; 4567 4568 if (R.empty()) { 4569 // Allow "using namespace std;" or "using namespace ::std;" even if 4570 // "std" hasn't been defined yet, for GCC compatibility. 4571 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4572 NamespcName->isStr("std")) { 4573 Diag(IdentLoc, diag::ext_using_undefined_std); 4574 R.addDecl(getOrCreateStdNamespace()); 4575 R.resolveKind(); 4576 } 4577 // Otherwise, attempt typo correction. 4578 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4579 CTC_NoKeywords, 0)) { 4580 if (R.getAsSingle<NamespaceDecl>() || 4581 R.getAsSingle<NamespaceAliasDecl>()) { 4582 if (DeclContext *DC = computeDeclContext(SS, false)) 4583 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4584 << NamespcName << DC << Corrected << SS.getRange() 4585 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4586 else 4587 Diag(IdentLoc, diag::err_using_directive_suggest) 4588 << NamespcName << Corrected 4589 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4590 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4591 << Corrected; 4592 4593 NamespcName = Corrected.getAsIdentifierInfo(); 4594 } else { 4595 R.clear(); 4596 R.setLookupName(NamespcName); 4597 } 4598 } 4599 } 4600 4601 if (!R.empty()) { 4602 NamedDecl *Named = R.getFoundDecl(); 4603 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4604 && "expected namespace decl"); 4605 // C++ [namespace.udir]p1: 4606 // A using-directive specifies that the names in the nominated 4607 // namespace can be used in the scope in which the 4608 // using-directive appears after the using-directive. During 4609 // unqualified name lookup (3.4.1), the names appear as if they 4610 // were declared in the nearest enclosing namespace which 4611 // contains both the using-directive and the nominated 4612 // namespace. [Note: in this context, "contains" means "contains 4613 // directly or indirectly". ] 4614 4615 // Find enclosing context containing both using-directive and 4616 // nominated namespace. 4617 NamespaceDecl *NS = getNamespaceDecl(Named); 4618 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4619 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4620 CommonAncestor = CommonAncestor->getParent(); 4621 4622 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4623 SS.getWithLocInContext(Context), 4624 IdentLoc, Named, CommonAncestor); 4625 4626 if (IsUsingDirectiveInToplevelContext(CurContext) && 4627 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4628 Diag(IdentLoc, diag::warn_using_directive_in_header); 4629 } 4630 4631 PushUsingDirective(S, UDir); 4632 } else { 4633 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4634 } 4635 4636 // FIXME: We ignore attributes for now. 4637 return UDir; 4638} 4639 4640void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4641 // If scope has associated entity, then using directive is at namespace 4642 // or translation unit scope. We add UsingDirectiveDecls, into 4643 // it's lookup structure. 4644 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4645 Ctx->addDecl(UDir); 4646 else 4647 // Otherwise it is block-sope. using-directives will affect lookup 4648 // only to the end of scope. 4649 S->PushUsingDirective(UDir); 4650} 4651 4652 4653Decl *Sema::ActOnUsingDeclaration(Scope *S, 4654 AccessSpecifier AS, 4655 bool HasUsingKeyword, 4656 SourceLocation UsingLoc, 4657 CXXScopeSpec &SS, 4658 UnqualifiedId &Name, 4659 AttributeList *AttrList, 4660 bool IsTypeName, 4661 SourceLocation TypenameLoc) { 4662 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4663 4664 switch (Name.getKind()) { 4665 case UnqualifiedId::IK_Identifier: 4666 case UnqualifiedId::IK_OperatorFunctionId: 4667 case UnqualifiedId::IK_LiteralOperatorId: 4668 case UnqualifiedId::IK_ConversionFunctionId: 4669 break; 4670 4671 case UnqualifiedId::IK_ConstructorName: 4672 case UnqualifiedId::IK_ConstructorTemplateId: 4673 // C++0x inherited constructors. 4674 if (getLangOptions().CPlusPlus0x) break; 4675 4676 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4677 << SS.getRange(); 4678 return 0; 4679 4680 case UnqualifiedId::IK_DestructorName: 4681 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4682 << SS.getRange(); 4683 return 0; 4684 4685 case UnqualifiedId::IK_TemplateId: 4686 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4687 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4688 return 0; 4689 } 4690 4691 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4692 DeclarationName TargetName = TargetNameInfo.getName(); 4693 if (!TargetName) 4694 return 0; 4695 4696 // Warn about using declarations. 4697 // TODO: store that the declaration was written without 'using' and 4698 // talk about access decls instead of using decls in the 4699 // diagnostics. 4700 if (!HasUsingKeyword) { 4701 UsingLoc = Name.getSourceRange().getBegin(); 4702 4703 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4704 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4705 } 4706 4707 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4708 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4709 return 0; 4710 4711 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4712 TargetNameInfo, AttrList, 4713 /* IsInstantiation */ false, 4714 IsTypeName, TypenameLoc); 4715 if (UD) 4716 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4717 4718 return UD; 4719} 4720 4721/// \brief Determine whether a using declaration considers the given 4722/// declarations as "equivalent", e.g., if they are redeclarations of 4723/// the same entity or are both typedefs of the same type. 4724static bool 4725IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4726 bool &SuppressRedeclaration) { 4727 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4728 SuppressRedeclaration = false; 4729 return true; 4730 } 4731 4732 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4733 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4734 SuppressRedeclaration = true; 4735 return Context.hasSameType(TD1->getUnderlyingType(), 4736 TD2->getUnderlyingType()); 4737 } 4738 4739 return false; 4740} 4741 4742 4743/// Determines whether to create a using shadow decl for a particular 4744/// decl, given the set of decls existing prior to this using lookup. 4745bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4746 const LookupResult &Previous) { 4747 // Diagnose finding a decl which is not from a base class of the 4748 // current class. We do this now because there are cases where this 4749 // function will silently decide not to build a shadow decl, which 4750 // will pre-empt further diagnostics. 4751 // 4752 // We don't need to do this in C++0x because we do the check once on 4753 // the qualifier. 4754 // 4755 // FIXME: diagnose the following if we care enough: 4756 // struct A { int foo; }; 4757 // struct B : A { using A::foo; }; 4758 // template <class T> struct C : A {}; 4759 // template <class T> struct D : C<T> { using B::foo; } // <--- 4760 // This is invalid (during instantiation) in C++03 because B::foo 4761 // resolves to the using decl in B, which is not a base class of D<T>. 4762 // We can't diagnose it immediately because C<T> is an unknown 4763 // specialization. The UsingShadowDecl in D<T> then points directly 4764 // to A::foo, which will look well-formed when we instantiate. 4765 // The right solution is to not collapse the shadow-decl chain. 4766 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4767 DeclContext *OrigDC = Orig->getDeclContext(); 4768 4769 // Handle enums and anonymous structs. 4770 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4771 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4772 while (OrigRec->isAnonymousStructOrUnion()) 4773 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4774 4775 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4776 if (OrigDC == CurContext) { 4777 Diag(Using->getLocation(), 4778 diag::err_using_decl_nested_name_specifier_is_current_class) 4779 << Using->getQualifierLoc().getSourceRange(); 4780 Diag(Orig->getLocation(), diag::note_using_decl_target); 4781 return true; 4782 } 4783 4784 Diag(Using->getQualifierLoc().getBeginLoc(), 4785 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4786 << Using->getQualifier() 4787 << cast<CXXRecordDecl>(CurContext) 4788 << Using->getQualifierLoc().getSourceRange(); 4789 Diag(Orig->getLocation(), diag::note_using_decl_target); 4790 return true; 4791 } 4792 } 4793 4794 if (Previous.empty()) return false; 4795 4796 NamedDecl *Target = Orig; 4797 if (isa<UsingShadowDecl>(Target)) 4798 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4799 4800 // If the target happens to be one of the previous declarations, we 4801 // don't have a conflict. 4802 // 4803 // FIXME: but we might be increasing its access, in which case we 4804 // should redeclare it. 4805 NamedDecl *NonTag = 0, *Tag = 0; 4806 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4807 I != E; ++I) { 4808 NamedDecl *D = (*I)->getUnderlyingDecl(); 4809 bool Result; 4810 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4811 return Result; 4812 4813 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4814 } 4815 4816 if (Target->isFunctionOrFunctionTemplate()) { 4817 FunctionDecl *FD; 4818 if (isa<FunctionTemplateDecl>(Target)) 4819 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4820 else 4821 FD = cast<FunctionDecl>(Target); 4822 4823 NamedDecl *OldDecl = 0; 4824 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4825 case Ovl_Overload: 4826 return false; 4827 4828 case Ovl_NonFunction: 4829 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4830 break; 4831 4832 // We found a decl with the exact signature. 4833 case Ovl_Match: 4834 // If we're in a record, we want to hide the target, so we 4835 // return true (without a diagnostic) to tell the caller not to 4836 // build a shadow decl. 4837 if (CurContext->isRecord()) 4838 return true; 4839 4840 // If we're not in a record, this is an error. 4841 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4842 break; 4843 } 4844 4845 Diag(Target->getLocation(), diag::note_using_decl_target); 4846 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4847 return true; 4848 } 4849 4850 // Target is not a function. 4851 4852 if (isa<TagDecl>(Target)) { 4853 // No conflict between a tag and a non-tag. 4854 if (!Tag) return false; 4855 4856 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4857 Diag(Target->getLocation(), diag::note_using_decl_target); 4858 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4859 return true; 4860 } 4861 4862 // No conflict between a tag and a non-tag. 4863 if (!NonTag) return false; 4864 4865 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4866 Diag(Target->getLocation(), diag::note_using_decl_target); 4867 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4868 return true; 4869} 4870 4871/// Builds a shadow declaration corresponding to a 'using' declaration. 4872UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4873 UsingDecl *UD, 4874 NamedDecl *Orig) { 4875 4876 // If we resolved to another shadow declaration, just coalesce them. 4877 NamedDecl *Target = Orig; 4878 if (isa<UsingShadowDecl>(Target)) { 4879 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4880 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4881 } 4882 4883 UsingShadowDecl *Shadow 4884 = UsingShadowDecl::Create(Context, CurContext, 4885 UD->getLocation(), UD, Target); 4886 UD->addShadowDecl(Shadow); 4887 4888 Shadow->setAccess(UD->getAccess()); 4889 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4890 Shadow->setInvalidDecl(); 4891 4892 if (S) 4893 PushOnScopeChains(Shadow, S); 4894 else 4895 CurContext->addDecl(Shadow); 4896 4897 4898 return Shadow; 4899} 4900 4901/// Hides a using shadow declaration. This is required by the current 4902/// using-decl implementation when a resolvable using declaration in a 4903/// class is followed by a declaration which would hide or override 4904/// one or more of the using decl's targets; for example: 4905/// 4906/// struct Base { void foo(int); }; 4907/// struct Derived : Base { 4908/// using Base::foo; 4909/// void foo(int); 4910/// }; 4911/// 4912/// The governing language is C++03 [namespace.udecl]p12: 4913/// 4914/// When a using-declaration brings names from a base class into a 4915/// derived class scope, member functions in the derived class 4916/// override and/or hide member functions with the same name and 4917/// parameter types in a base class (rather than conflicting). 4918/// 4919/// There are two ways to implement this: 4920/// (1) optimistically create shadow decls when they're not hidden 4921/// by existing declarations, or 4922/// (2) don't create any shadow decls (or at least don't make them 4923/// visible) until we've fully parsed/instantiated the class. 4924/// The problem with (1) is that we might have to retroactively remove 4925/// a shadow decl, which requires several O(n) operations because the 4926/// decl structures are (very reasonably) not designed for removal. 4927/// (2) avoids this but is very fiddly and phase-dependent. 4928void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4929 if (Shadow->getDeclName().getNameKind() == 4930 DeclarationName::CXXConversionFunctionName) 4931 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4932 4933 // Remove it from the DeclContext... 4934 Shadow->getDeclContext()->removeDecl(Shadow); 4935 4936 // ...and the scope, if applicable... 4937 if (S) { 4938 S->RemoveDecl(Shadow); 4939 IdResolver.RemoveDecl(Shadow); 4940 } 4941 4942 // ...and the using decl. 4943 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4944 4945 // TODO: complain somehow if Shadow was used. It shouldn't 4946 // be possible for this to happen, because...? 4947} 4948 4949/// Builds a using declaration. 4950/// 4951/// \param IsInstantiation - Whether this call arises from an 4952/// instantiation of an unresolved using declaration. We treat 4953/// the lookup differently for these declarations. 4954NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4955 SourceLocation UsingLoc, 4956 CXXScopeSpec &SS, 4957 const DeclarationNameInfo &NameInfo, 4958 AttributeList *AttrList, 4959 bool IsInstantiation, 4960 bool IsTypeName, 4961 SourceLocation TypenameLoc) { 4962 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4963 SourceLocation IdentLoc = NameInfo.getLoc(); 4964 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4965 4966 // FIXME: We ignore attributes for now. 4967 4968 if (SS.isEmpty()) { 4969 Diag(IdentLoc, diag::err_using_requires_qualname); 4970 return 0; 4971 } 4972 4973 // Do the redeclaration lookup in the current scope. 4974 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4975 ForRedeclaration); 4976 Previous.setHideTags(false); 4977 if (S) { 4978 LookupName(Previous, S); 4979 4980 // It is really dumb that we have to do this. 4981 LookupResult::Filter F = Previous.makeFilter(); 4982 while (F.hasNext()) { 4983 NamedDecl *D = F.next(); 4984 if (!isDeclInScope(D, CurContext, S)) 4985 F.erase(); 4986 } 4987 F.done(); 4988 } else { 4989 assert(IsInstantiation && "no scope in non-instantiation"); 4990 assert(CurContext->isRecord() && "scope not record in instantiation"); 4991 LookupQualifiedName(Previous, CurContext); 4992 } 4993 4994 // Check for invalid redeclarations. 4995 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4996 return 0; 4997 4998 // Check for bad qualifiers. 4999 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5000 return 0; 5001 5002 DeclContext *LookupContext = computeDeclContext(SS); 5003 NamedDecl *D; 5004 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5005 if (!LookupContext) { 5006 if (IsTypeName) { 5007 // FIXME: not all declaration name kinds are legal here 5008 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5009 UsingLoc, TypenameLoc, 5010 QualifierLoc, 5011 IdentLoc, NameInfo.getName()); 5012 } else { 5013 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5014 QualifierLoc, NameInfo); 5015 } 5016 } else { 5017 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5018 NameInfo, IsTypeName); 5019 } 5020 D->setAccess(AS); 5021 CurContext->addDecl(D); 5022 5023 if (!LookupContext) return D; 5024 UsingDecl *UD = cast<UsingDecl>(D); 5025 5026 if (RequireCompleteDeclContext(SS, LookupContext)) { 5027 UD->setInvalidDecl(); 5028 return UD; 5029 } 5030 5031 // Constructor inheriting using decls get special treatment. 5032 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5033 if (CheckInheritedConstructorUsingDecl(UD)) 5034 UD->setInvalidDecl(); 5035 return UD; 5036 } 5037 5038 // Otherwise, look up the target name. 5039 5040 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5041 5042 // Unlike most lookups, we don't always want to hide tag 5043 // declarations: tag names are visible through the using declaration 5044 // even if hidden by ordinary names, *except* in a dependent context 5045 // where it's important for the sanity of two-phase lookup. 5046 if (!IsInstantiation) 5047 R.setHideTags(false); 5048 5049 LookupQualifiedName(R, LookupContext); 5050 5051 if (R.empty()) { 5052 Diag(IdentLoc, diag::err_no_member) 5053 << NameInfo.getName() << LookupContext << SS.getRange(); 5054 UD->setInvalidDecl(); 5055 return UD; 5056 } 5057 5058 if (R.isAmbiguous()) { 5059 UD->setInvalidDecl(); 5060 return UD; 5061 } 5062 5063 if (IsTypeName) { 5064 // If we asked for a typename and got a non-type decl, error out. 5065 if (!R.getAsSingle<TypeDecl>()) { 5066 Diag(IdentLoc, diag::err_using_typename_non_type); 5067 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5068 Diag((*I)->getUnderlyingDecl()->getLocation(), 5069 diag::note_using_decl_target); 5070 UD->setInvalidDecl(); 5071 return UD; 5072 } 5073 } else { 5074 // If we asked for a non-typename and we got a type, error out, 5075 // but only if this is an instantiation of an unresolved using 5076 // decl. Otherwise just silently find the type name. 5077 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5078 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5079 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5080 UD->setInvalidDecl(); 5081 return UD; 5082 } 5083 } 5084 5085 // C++0x N2914 [namespace.udecl]p6: 5086 // A using-declaration shall not name a namespace. 5087 if (R.getAsSingle<NamespaceDecl>()) { 5088 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5089 << SS.getRange(); 5090 UD->setInvalidDecl(); 5091 return UD; 5092 } 5093 5094 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5095 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5096 BuildUsingShadowDecl(S, UD, *I); 5097 } 5098 5099 return UD; 5100} 5101 5102/// Additional checks for a using declaration referring to a constructor name. 5103bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5104 if (UD->isTypeName()) { 5105 // FIXME: Cannot specify typename when specifying constructor 5106 return true; 5107 } 5108 5109 const Type *SourceType = UD->getQualifier()->getAsType(); 5110 assert(SourceType && 5111 "Using decl naming constructor doesn't have type in scope spec."); 5112 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5113 5114 // Check whether the named type is a direct base class. 5115 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5116 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5117 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5118 BaseIt != BaseE; ++BaseIt) { 5119 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5120 if (CanonicalSourceType == BaseType) 5121 break; 5122 } 5123 5124 if (BaseIt == BaseE) { 5125 // Did not find SourceType in the bases. 5126 Diag(UD->getUsingLocation(), 5127 diag::err_using_decl_constructor_not_in_direct_base) 5128 << UD->getNameInfo().getSourceRange() 5129 << QualType(SourceType, 0) << TargetClass; 5130 return true; 5131 } 5132 5133 BaseIt->setInheritConstructors(); 5134 5135 return false; 5136} 5137 5138/// Checks that the given using declaration is not an invalid 5139/// redeclaration. Note that this is checking only for the using decl 5140/// itself, not for any ill-formedness among the UsingShadowDecls. 5141bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5142 bool isTypeName, 5143 const CXXScopeSpec &SS, 5144 SourceLocation NameLoc, 5145 const LookupResult &Prev) { 5146 // C++03 [namespace.udecl]p8: 5147 // C++0x [namespace.udecl]p10: 5148 // A using-declaration is a declaration and can therefore be used 5149 // repeatedly where (and only where) multiple declarations are 5150 // allowed. 5151 // 5152 // That's in non-member contexts. 5153 if (!CurContext->getRedeclContext()->isRecord()) 5154 return false; 5155 5156 NestedNameSpecifier *Qual 5157 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5158 5159 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5160 NamedDecl *D = *I; 5161 5162 bool DTypename; 5163 NestedNameSpecifier *DQual; 5164 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5165 DTypename = UD->isTypeName(); 5166 DQual = UD->getQualifier(); 5167 } else if (UnresolvedUsingValueDecl *UD 5168 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5169 DTypename = false; 5170 DQual = UD->getQualifier(); 5171 } else if (UnresolvedUsingTypenameDecl *UD 5172 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5173 DTypename = true; 5174 DQual = UD->getQualifier(); 5175 } else continue; 5176 5177 // using decls differ if one says 'typename' and the other doesn't. 5178 // FIXME: non-dependent using decls? 5179 if (isTypeName != DTypename) continue; 5180 5181 // using decls differ if they name different scopes (but note that 5182 // template instantiation can cause this check to trigger when it 5183 // didn't before instantiation). 5184 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5185 Context.getCanonicalNestedNameSpecifier(DQual)) 5186 continue; 5187 5188 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5189 Diag(D->getLocation(), diag::note_using_decl) << 1; 5190 return true; 5191 } 5192 5193 return false; 5194} 5195 5196 5197/// Checks that the given nested-name qualifier used in a using decl 5198/// in the current context is appropriately related to the current 5199/// scope. If an error is found, diagnoses it and returns true. 5200bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5201 const CXXScopeSpec &SS, 5202 SourceLocation NameLoc) { 5203 DeclContext *NamedContext = computeDeclContext(SS); 5204 5205 if (!CurContext->isRecord()) { 5206 // C++03 [namespace.udecl]p3: 5207 // C++0x [namespace.udecl]p8: 5208 // A using-declaration for a class member shall be a member-declaration. 5209 5210 // If we weren't able to compute a valid scope, it must be a 5211 // dependent class scope. 5212 if (!NamedContext || NamedContext->isRecord()) { 5213 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5214 << SS.getRange(); 5215 return true; 5216 } 5217 5218 // Otherwise, everything is known to be fine. 5219 return false; 5220 } 5221 5222 // The current scope is a record. 5223 5224 // If the named context is dependent, we can't decide much. 5225 if (!NamedContext) { 5226 // FIXME: in C++0x, we can diagnose if we can prove that the 5227 // nested-name-specifier does not refer to a base class, which is 5228 // still possible in some cases. 5229 5230 // Otherwise we have to conservatively report that things might be 5231 // okay. 5232 return false; 5233 } 5234 5235 if (!NamedContext->isRecord()) { 5236 // Ideally this would point at the last name in the specifier, 5237 // but we don't have that level of source info. 5238 Diag(SS.getRange().getBegin(), 5239 diag::err_using_decl_nested_name_specifier_is_not_class) 5240 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5241 return true; 5242 } 5243 5244 if (!NamedContext->isDependentContext() && 5245 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5246 return true; 5247 5248 if (getLangOptions().CPlusPlus0x) { 5249 // C++0x [namespace.udecl]p3: 5250 // In a using-declaration used as a member-declaration, the 5251 // nested-name-specifier shall name a base class of the class 5252 // being defined. 5253 5254 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5255 cast<CXXRecordDecl>(NamedContext))) { 5256 if (CurContext == NamedContext) { 5257 Diag(NameLoc, 5258 diag::err_using_decl_nested_name_specifier_is_current_class) 5259 << SS.getRange(); 5260 return true; 5261 } 5262 5263 Diag(SS.getRange().getBegin(), 5264 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5265 << (NestedNameSpecifier*) SS.getScopeRep() 5266 << cast<CXXRecordDecl>(CurContext) 5267 << SS.getRange(); 5268 return true; 5269 } 5270 5271 return false; 5272 } 5273 5274 // C++03 [namespace.udecl]p4: 5275 // A using-declaration used as a member-declaration shall refer 5276 // to a member of a base class of the class being defined [etc.]. 5277 5278 // Salient point: SS doesn't have to name a base class as long as 5279 // lookup only finds members from base classes. Therefore we can 5280 // diagnose here only if we can prove that that can't happen, 5281 // i.e. if the class hierarchies provably don't intersect. 5282 5283 // TODO: it would be nice if "definitely valid" results were cached 5284 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5285 // need to be repeated. 5286 5287 struct UserData { 5288 llvm::DenseSet<const CXXRecordDecl*> Bases; 5289 5290 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5291 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5292 Data->Bases.insert(Base); 5293 return true; 5294 } 5295 5296 bool hasDependentBases(const CXXRecordDecl *Class) { 5297 return !Class->forallBases(collect, this); 5298 } 5299 5300 /// Returns true if the base is dependent or is one of the 5301 /// accumulated base classes. 5302 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5303 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5304 return !Data->Bases.count(Base); 5305 } 5306 5307 bool mightShareBases(const CXXRecordDecl *Class) { 5308 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5309 } 5310 }; 5311 5312 UserData Data; 5313 5314 // Returns false if we find a dependent base. 5315 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5316 return false; 5317 5318 // Returns false if the class has a dependent base or if it or one 5319 // of its bases is present in the base set of the current context. 5320 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5321 return false; 5322 5323 Diag(SS.getRange().getBegin(), 5324 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5325 << (NestedNameSpecifier*) SS.getScopeRep() 5326 << cast<CXXRecordDecl>(CurContext) 5327 << SS.getRange(); 5328 5329 return true; 5330} 5331 5332Decl *Sema::ActOnAliasDeclaration(Scope *S, 5333 AccessSpecifier AS, 5334 MultiTemplateParamsArg TemplateParamLists, 5335 SourceLocation UsingLoc, 5336 UnqualifiedId &Name, 5337 TypeResult Type) { 5338 // Skip up to the relevant declaration scope. 5339 while (S->getFlags() & Scope::TemplateParamScope) 5340 S = S->getParent(); 5341 assert((S->getFlags() & Scope::DeclScope) && 5342 "got alias-declaration outside of declaration scope"); 5343 5344 if (Type.isInvalid()) 5345 return 0; 5346 5347 bool Invalid = false; 5348 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5349 TypeSourceInfo *TInfo = 0; 5350 GetTypeFromParser(Type.get(), &TInfo); 5351 5352 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5353 return 0; 5354 5355 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5356 UPPC_DeclarationType)) { 5357 Invalid = true; 5358 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5359 TInfo->getTypeLoc().getBeginLoc()); 5360 } 5361 5362 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5363 LookupName(Previous, S); 5364 5365 // Warn about shadowing the name of a template parameter. 5366 if (Previous.isSingleResult() && 5367 Previous.getFoundDecl()->isTemplateParameter()) { 5368 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5369 Previous.getFoundDecl())) 5370 Invalid = true; 5371 Previous.clear(); 5372 } 5373 5374 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5375 "name in alias declaration must be an identifier"); 5376 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5377 Name.StartLocation, 5378 Name.Identifier, TInfo); 5379 5380 NewTD->setAccess(AS); 5381 5382 if (Invalid) 5383 NewTD->setInvalidDecl(); 5384 5385 CheckTypedefForVariablyModifiedType(S, NewTD); 5386 Invalid |= NewTD->isInvalidDecl(); 5387 5388 bool Redeclaration = false; 5389 5390 NamedDecl *NewND; 5391 if (TemplateParamLists.size()) { 5392 TypeAliasTemplateDecl *OldDecl = 0; 5393 TemplateParameterList *OldTemplateParams = 0; 5394 5395 if (TemplateParamLists.size() != 1) { 5396 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5397 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5398 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5399 } 5400 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5401 5402 // Only consider previous declarations in the same scope. 5403 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5404 /*ExplicitInstantiationOrSpecialization*/false); 5405 if (!Previous.empty()) { 5406 Redeclaration = true; 5407 5408 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5409 if (!OldDecl && !Invalid) { 5410 Diag(UsingLoc, diag::err_redefinition_different_kind) 5411 << Name.Identifier; 5412 5413 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5414 if (OldD->getLocation().isValid()) 5415 Diag(OldD->getLocation(), diag::note_previous_definition); 5416 5417 Invalid = true; 5418 } 5419 5420 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5421 if (TemplateParameterListsAreEqual(TemplateParams, 5422 OldDecl->getTemplateParameters(), 5423 /*Complain=*/true, 5424 TPL_TemplateMatch)) 5425 OldTemplateParams = OldDecl->getTemplateParameters(); 5426 else 5427 Invalid = true; 5428 5429 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5430 if (!Invalid && 5431 !Context.hasSameType(OldTD->getUnderlyingType(), 5432 NewTD->getUnderlyingType())) { 5433 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5434 // but we can't reasonably accept it. 5435 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5436 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5437 if (OldTD->getLocation().isValid()) 5438 Diag(OldTD->getLocation(), diag::note_previous_definition); 5439 Invalid = true; 5440 } 5441 } 5442 } 5443 5444 // Merge any previous default template arguments into our parameters, 5445 // and check the parameter list. 5446 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5447 TPC_TypeAliasTemplate)) 5448 return 0; 5449 5450 TypeAliasTemplateDecl *NewDecl = 5451 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5452 Name.Identifier, TemplateParams, 5453 NewTD); 5454 5455 NewDecl->setAccess(AS); 5456 5457 if (Invalid) 5458 NewDecl->setInvalidDecl(); 5459 else if (OldDecl) 5460 NewDecl->setPreviousDeclaration(OldDecl); 5461 5462 NewND = NewDecl; 5463 } else { 5464 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5465 NewND = NewTD; 5466 } 5467 5468 if (!Redeclaration) 5469 PushOnScopeChains(NewND, S); 5470 5471 return NewND; 5472} 5473 5474Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5475 SourceLocation NamespaceLoc, 5476 SourceLocation AliasLoc, 5477 IdentifierInfo *Alias, 5478 CXXScopeSpec &SS, 5479 SourceLocation IdentLoc, 5480 IdentifierInfo *Ident) { 5481 5482 // Lookup the namespace name. 5483 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5484 LookupParsedName(R, S, &SS); 5485 5486 // Check if we have a previous declaration with the same name. 5487 NamedDecl *PrevDecl 5488 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5489 ForRedeclaration); 5490 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5491 PrevDecl = 0; 5492 5493 if (PrevDecl) { 5494 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5495 // We already have an alias with the same name that points to the same 5496 // namespace, so don't create a new one. 5497 // FIXME: At some point, we'll want to create the (redundant) 5498 // declaration to maintain better source information. 5499 if (!R.isAmbiguous() && !R.empty() && 5500 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5501 return 0; 5502 } 5503 5504 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5505 diag::err_redefinition_different_kind; 5506 Diag(AliasLoc, DiagID) << Alias; 5507 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5508 return 0; 5509 } 5510 5511 if (R.isAmbiguous()) 5512 return 0; 5513 5514 if (R.empty()) { 5515 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5516 CTC_NoKeywords, 0)) { 5517 if (R.getAsSingle<NamespaceDecl>() || 5518 R.getAsSingle<NamespaceAliasDecl>()) { 5519 if (DeclContext *DC = computeDeclContext(SS, false)) 5520 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5521 << Ident << DC << Corrected << SS.getRange() 5522 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5523 else 5524 Diag(IdentLoc, diag::err_using_directive_suggest) 5525 << Ident << Corrected 5526 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5527 5528 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5529 << Corrected; 5530 5531 Ident = Corrected.getAsIdentifierInfo(); 5532 } else { 5533 R.clear(); 5534 R.setLookupName(Ident); 5535 } 5536 } 5537 5538 if (R.empty()) { 5539 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5540 return 0; 5541 } 5542 } 5543 5544 NamespaceAliasDecl *AliasDecl = 5545 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5546 Alias, SS.getWithLocInContext(Context), 5547 IdentLoc, R.getFoundDecl()); 5548 5549 PushOnScopeChains(AliasDecl, S); 5550 return AliasDecl; 5551} 5552 5553namespace { 5554 /// \brief Scoped object used to handle the state changes required in Sema 5555 /// to implicitly define the body of a C++ member function; 5556 class ImplicitlyDefinedFunctionScope { 5557 Sema &S; 5558 Sema::ContextRAII SavedContext; 5559 5560 public: 5561 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5562 : S(S), SavedContext(S, Method) 5563 { 5564 S.PushFunctionScope(); 5565 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5566 } 5567 5568 ~ImplicitlyDefinedFunctionScope() { 5569 S.PopExpressionEvaluationContext(); 5570 S.PopFunctionOrBlockScope(); 5571 } 5572 }; 5573} 5574 5575static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5576 CXXRecordDecl *D) { 5577 ASTContext &Context = Self.Context; 5578 QualType ClassType = Context.getTypeDeclType(D); 5579 DeclarationName ConstructorName 5580 = Context.DeclarationNames.getCXXConstructorName( 5581 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5582 5583 DeclContext::lookup_const_iterator Con, ConEnd; 5584 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5585 Con != ConEnd; ++Con) { 5586 // FIXME: In C++0x, a constructor template can be a default constructor. 5587 if (isa<FunctionTemplateDecl>(*Con)) 5588 continue; 5589 5590 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5591 if (Constructor->isDefaultConstructor()) 5592 return Constructor; 5593 } 5594 return 0; 5595} 5596 5597Sema::ImplicitExceptionSpecification 5598Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5599 // C++ [except.spec]p14: 5600 // An implicitly declared special member function (Clause 12) shall have an 5601 // exception-specification. [...] 5602 ImplicitExceptionSpecification ExceptSpec(Context); 5603 5604 // Direct base-class constructors. 5605 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5606 BEnd = ClassDecl->bases_end(); 5607 B != BEnd; ++B) { 5608 if (B->isVirtual()) // Handled below. 5609 continue; 5610 5611 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5612 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5613 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5614 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5615 else if (CXXConstructorDecl *Constructor 5616 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5617 ExceptSpec.CalledDecl(Constructor); 5618 } 5619 } 5620 5621 // Virtual base-class constructors. 5622 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5623 BEnd = ClassDecl->vbases_end(); 5624 B != BEnd; ++B) { 5625 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5626 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5627 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5628 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5629 else if (CXXConstructorDecl *Constructor 5630 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5631 ExceptSpec.CalledDecl(Constructor); 5632 } 5633 } 5634 5635 // Field constructors. 5636 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5637 FEnd = ClassDecl->field_end(); 5638 F != FEnd; ++F) { 5639 if (const RecordType *RecordTy 5640 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5641 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5642 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5643 ExceptSpec.CalledDecl( 5644 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5645 else if (CXXConstructorDecl *Constructor 5646 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5647 ExceptSpec.CalledDecl(Constructor); 5648 } 5649 } 5650 5651 return ExceptSpec; 5652} 5653 5654CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5655 CXXRecordDecl *ClassDecl) { 5656 // C++ [class.ctor]p5: 5657 // A default constructor for a class X is a constructor of class X 5658 // that can be called without an argument. If there is no 5659 // user-declared constructor for class X, a default constructor is 5660 // implicitly declared. An implicitly-declared default constructor 5661 // is an inline public member of its class. 5662 assert(!ClassDecl->hasUserDeclaredConstructor() && 5663 "Should not build implicit default constructor!"); 5664 5665 ImplicitExceptionSpecification Spec = 5666 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5667 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5668 5669 // Create the actual constructor declaration. 5670 CanQualType ClassType 5671 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5672 SourceLocation ClassLoc = ClassDecl->getLocation(); 5673 DeclarationName Name 5674 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5675 DeclarationNameInfo NameInfo(Name, ClassLoc); 5676 CXXConstructorDecl *DefaultCon 5677 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5678 Context.getFunctionType(Context.VoidTy, 5679 0, 0, EPI), 5680 /*TInfo=*/0, 5681 /*isExplicit=*/false, 5682 /*isInline=*/true, 5683 /*isImplicitlyDeclared=*/true); 5684 DefaultCon->setAccess(AS_public); 5685 DefaultCon->setDefaulted(); 5686 DefaultCon->setImplicit(); 5687 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5688 5689 // Note that we have declared this constructor. 5690 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5691 5692 // Do not delete this yet if we're in a template 5693 if (!ClassDecl->isDependentType() && 5694 ShouldDeleteDefaultConstructor(DefaultCon)) 5695 DefaultCon->setDeletedAsWritten(); 5696 5697 if (Scope *S = getScopeForContext(ClassDecl)) 5698 PushOnScopeChains(DefaultCon, S, false); 5699 ClassDecl->addDecl(DefaultCon); 5700 5701 return DefaultCon; 5702} 5703 5704void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5705 CXXConstructorDecl *Constructor) { 5706 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5707 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 5708 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5709 5710 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5711 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5712 5713 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5714 DiagnosticErrorTrap Trap(Diags); 5715 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5716 Trap.hasErrorOccurred()) { 5717 Diag(CurrentLocation, diag::note_member_synthesized_at) 5718 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 5719 Constructor->setInvalidDecl(); 5720 return; 5721 } 5722 5723 SourceLocation Loc = Constructor->getLocation(); 5724 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5725 5726 Constructor->setUsed(); 5727 MarkVTableUsed(CurrentLocation, ClassDecl); 5728 5729 if (ASTMutationListener *L = getASTMutationListener()) { 5730 L->CompletedImplicitDefinition(Constructor); 5731 } 5732} 5733 5734void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5735 // We start with an initial pass over the base classes to collect those that 5736 // inherit constructors from. If there are none, we can forgo all further 5737 // processing. 5738 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5739 BasesVector BasesToInheritFrom; 5740 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5741 BaseE = ClassDecl->bases_end(); 5742 BaseIt != BaseE; ++BaseIt) { 5743 if (BaseIt->getInheritConstructors()) { 5744 QualType Base = BaseIt->getType(); 5745 if (Base->isDependentType()) { 5746 // If we inherit constructors from anything that is dependent, just 5747 // abort processing altogether. We'll get another chance for the 5748 // instantiations. 5749 return; 5750 } 5751 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5752 } 5753 } 5754 if (BasesToInheritFrom.empty()) 5755 return; 5756 5757 // Now collect the constructors that we already have in the current class. 5758 // Those take precedence over inherited constructors. 5759 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5760 // unless there is a user-declared constructor with the same signature in 5761 // the class where the using-declaration appears. 5762 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5763 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5764 CtorE = ClassDecl->ctor_end(); 5765 CtorIt != CtorE; ++CtorIt) { 5766 ExistingConstructors.insert( 5767 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5768 } 5769 5770 Scope *S = getScopeForContext(ClassDecl); 5771 DeclarationName CreatedCtorName = 5772 Context.DeclarationNames.getCXXConstructorName( 5773 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5774 5775 // Now comes the true work. 5776 // First, we keep a map from constructor types to the base that introduced 5777 // them. Needed for finding conflicting constructors. We also keep the 5778 // actually inserted declarations in there, for pretty diagnostics. 5779 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5780 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5781 ConstructorToSourceMap InheritedConstructors; 5782 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5783 BaseE = BasesToInheritFrom.end(); 5784 BaseIt != BaseE; ++BaseIt) { 5785 const RecordType *Base = *BaseIt; 5786 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5787 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5788 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5789 CtorE = BaseDecl->ctor_end(); 5790 CtorIt != CtorE; ++CtorIt) { 5791 // Find the using declaration for inheriting this base's constructors. 5792 DeclarationName Name = 5793 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5794 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5795 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5796 SourceLocation UsingLoc = UD ? UD->getLocation() : 5797 ClassDecl->getLocation(); 5798 5799 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5800 // from the class X named in the using-declaration consists of actual 5801 // constructors and notional constructors that result from the 5802 // transformation of defaulted parameters as follows: 5803 // - all non-template default constructors of X, and 5804 // - for each non-template constructor of X that has at least one 5805 // parameter with a default argument, the set of constructors that 5806 // results from omitting any ellipsis parameter specification and 5807 // successively omitting parameters with a default argument from the 5808 // end of the parameter-type-list. 5809 CXXConstructorDecl *BaseCtor = *CtorIt; 5810 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5811 const FunctionProtoType *BaseCtorType = 5812 BaseCtor->getType()->getAs<FunctionProtoType>(); 5813 5814 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5815 maxParams = BaseCtor->getNumParams(); 5816 params <= maxParams; ++params) { 5817 // Skip default constructors. They're never inherited. 5818 if (params == 0) 5819 continue; 5820 // Skip copy and move constructors for the same reason. 5821 if (CanBeCopyOrMove && params == 1) 5822 continue; 5823 5824 // Build up a function type for this particular constructor. 5825 // FIXME: The working paper does not consider that the exception spec 5826 // for the inheriting constructor might be larger than that of the 5827 // source. This code doesn't yet, either. 5828 const Type *NewCtorType; 5829 if (params == maxParams) 5830 NewCtorType = BaseCtorType; 5831 else { 5832 llvm::SmallVector<QualType, 16> Args; 5833 for (unsigned i = 0; i < params; ++i) { 5834 Args.push_back(BaseCtorType->getArgType(i)); 5835 } 5836 FunctionProtoType::ExtProtoInfo ExtInfo = 5837 BaseCtorType->getExtProtoInfo(); 5838 ExtInfo.Variadic = false; 5839 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5840 Args.data(), params, ExtInfo) 5841 .getTypePtr(); 5842 } 5843 const Type *CanonicalNewCtorType = 5844 Context.getCanonicalType(NewCtorType); 5845 5846 // Now that we have the type, first check if the class already has a 5847 // constructor with this signature. 5848 if (ExistingConstructors.count(CanonicalNewCtorType)) 5849 continue; 5850 5851 // Then we check if we have already declared an inherited constructor 5852 // with this signature. 5853 std::pair<ConstructorToSourceMap::iterator, bool> result = 5854 InheritedConstructors.insert(std::make_pair( 5855 CanonicalNewCtorType, 5856 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5857 if (!result.second) { 5858 // Already in the map. If it came from a different class, that's an 5859 // error. Not if it's from the same. 5860 CanQualType PreviousBase = result.first->second.first; 5861 if (CanonicalBase != PreviousBase) { 5862 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5863 const CXXConstructorDecl *PrevBaseCtor = 5864 PrevCtor->getInheritedConstructor(); 5865 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5866 5867 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5868 Diag(BaseCtor->getLocation(), 5869 diag::note_using_decl_constructor_conflict_current_ctor); 5870 Diag(PrevBaseCtor->getLocation(), 5871 diag::note_using_decl_constructor_conflict_previous_ctor); 5872 Diag(PrevCtor->getLocation(), 5873 diag::note_using_decl_constructor_conflict_previous_using); 5874 } 5875 continue; 5876 } 5877 5878 // OK, we're there, now add the constructor. 5879 // C++0x [class.inhctor]p8: [...] that would be performed by a 5880 // user-writtern inline constructor [...] 5881 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5882 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5883 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5884 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5885 /*ImplicitlyDeclared=*/true); 5886 NewCtor->setAccess(BaseCtor->getAccess()); 5887 5888 // Build up the parameter decls and add them. 5889 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5890 for (unsigned i = 0; i < params; ++i) { 5891 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5892 UsingLoc, UsingLoc, 5893 /*IdentifierInfo=*/0, 5894 BaseCtorType->getArgType(i), 5895 /*TInfo=*/0, SC_None, 5896 SC_None, /*DefaultArg=*/0)); 5897 } 5898 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5899 NewCtor->setInheritedConstructor(BaseCtor); 5900 5901 PushOnScopeChains(NewCtor, S, false); 5902 ClassDecl->addDecl(NewCtor); 5903 result.first->second.second = NewCtor; 5904 } 5905 } 5906 } 5907} 5908 5909Sema::ImplicitExceptionSpecification 5910Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5911 // C++ [except.spec]p14: 5912 // An implicitly declared special member function (Clause 12) shall have 5913 // an exception-specification. 5914 ImplicitExceptionSpecification ExceptSpec(Context); 5915 5916 // Direct base-class destructors. 5917 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5918 BEnd = ClassDecl->bases_end(); 5919 B != BEnd; ++B) { 5920 if (B->isVirtual()) // Handled below. 5921 continue; 5922 5923 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5924 ExceptSpec.CalledDecl( 5925 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5926 } 5927 5928 // Virtual base-class destructors. 5929 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5930 BEnd = ClassDecl->vbases_end(); 5931 B != BEnd; ++B) { 5932 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5933 ExceptSpec.CalledDecl( 5934 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5935 } 5936 5937 // Field destructors. 5938 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5939 FEnd = ClassDecl->field_end(); 5940 F != FEnd; ++F) { 5941 if (const RecordType *RecordTy 5942 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5943 ExceptSpec.CalledDecl( 5944 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5945 } 5946 5947 return ExceptSpec; 5948} 5949 5950CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5951 // C++ [class.dtor]p2: 5952 // If a class has no user-declared destructor, a destructor is 5953 // declared implicitly. An implicitly-declared destructor is an 5954 // inline public member of its class. 5955 5956 ImplicitExceptionSpecification Spec = 5957 ComputeDefaultedDtorExceptionSpec(ClassDecl); 5958 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5959 5960 // Create the actual destructor declaration. 5961 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5962 5963 CanQualType ClassType 5964 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5965 SourceLocation ClassLoc = ClassDecl->getLocation(); 5966 DeclarationName Name 5967 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5968 DeclarationNameInfo NameInfo(Name, ClassLoc); 5969 CXXDestructorDecl *Destructor 5970 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5971 /*isInline=*/true, 5972 /*isImplicitlyDeclared=*/true); 5973 Destructor->setAccess(AS_public); 5974 Destructor->setDefaulted(); 5975 Destructor->setImplicit(); 5976 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5977 5978 // Note that we have declared this destructor. 5979 ++ASTContext::NumImplicitDestructorsDeclared; 5980 5981 // Introduce this destructor into its scope. 5982 if (Scope *S = getScopeForContext(ClassDecl)) 5983 PushOnScopeChains(Destructor, S, false); 5984 ClassDecl->addDecl(Destructor); 5985 5986 // This could be uniqued if it ever proves significant. 5987 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5988 5989 if (ShouldDeleteDestructor(Destructor)) 5990 Destructor->setDeletedAsWritten(); 5991 5992 AddOverriddenMethods(ClassDecl, Destructor); 5993 5994 return Destructor; 5995} 5996 5997void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5998 CXXDestructorDecl *Destructor) { 5999 assert((Destructor->isDefaulted() && !Destructor->isUsed(false)) && 6000 "DefineImplicitDestructor - call it for implicit default dtor"); 6001 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6002 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6003 6004 if (Destructor->isInvalidDecl()) 6005 return; 6006 6007 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6008 6009 DiagnosticErrorTrap Trap(Diags); 6010 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6011 Destructor->getParent()); 6012 6013 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6014 Diag(CurrentLocation, diag::note_member_synthesized_at) 6015 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6016 6017 Destructor->setInvalidDecl(); 6018 return; 6019 } 6020 6021 SourceLocation Loc = Destructor->getLocation(); 6022 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6023 6024 Destructor->setUsed(); 6025 MarkVTableUsed(CurrentLocation, ClassDecl); 6026 6027 if (ASTMutationListener *L = getASTMutationListener()) { 6028 L->CompletedImplicitDefinition(Destructor); 6029 } 6030} 6031 6032/// \brief Builds a statement that copies the given entity from \p From to 6033/// \c To. 6034/// 6035/// This routine is used to copy the members of a class with an 6036/// implicitly-declared copy assignment operator. When the entities being 6037/// copied are arrays, this routine builds for loops to copy them. 6038/// 6039/// \param S The Sema object used for type-checking. 6040/// 6041/// \param Loc The location where the implicit copy is being generated. 6042/// 6043/// \param T The type of the expressions being copied. Both expressions must 6044/// have this type. 6045/// 6046/// \param To The expression we are copying to. 6047/// 6048/// \param From The expression we are copying from. 6049/// 6050/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6051/// Otherwise, it's a non-static member subobject. 6052/// 6053/// \param Depth Internal parameter recording the depth of the recursion. 6054/// 6055/// \returns A statement or a loop that copies the expressions. 6056static StmtResult 6057BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6058 Expr *To, Expr *From, 6059 bool CopyingBaseSubobject, unsigned Depth = 0) { 6060 // C++0x [class.copy]p30: 6061 // Each subobject is assigned in the manner appropriate to its type: 6062 // 6063 // - if the subobject is of class type, the copy assignment operator 6064 // for the class is used (as if by explicit qualification; that is, 6065 // ignoring any possible virtual overriding functions in more derived 6066 // classes); 6067 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6068 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6069 6070 // Look for operator=. 6071 DeclarationName Name 6072 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6073 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6074 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6075 6076 // Filter out any result that isn't a copy-assignment operator. 6077 LookupResult::Filter F = OpLookup.makeFilter(); 6078 while (F.hasNext()) { 6079 NamedDecl *D = F.next(); 6080 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6081 if (Method->isCopyAssignmentOperator()) 6082 continue; 6083 6084 F.erase(); 6085 } 6086 F.done(); 6087 6088 // Suppress the protected check (C++ [class.protected]) for each of the 6089 // assignment operators we found. This strange dance is required when 6090 // we're assigning via a base classes's copy-assignment operator. To 6091 // ensure that we're getting the right base class subobject (without 6092 // ambiguities), we need to cast "this" to that subobject type; to 6093 // ensure that we don't go through the virtual call mechanism, we need 6094 // to qualify the operator= name with the base class (see below). However, 6095 // this means that if the base class has a protected copy assignment 6096 // operator, the protected member access check will fail. So, we 6097 // rewrite "protected" access to "public" access in this case, since we 6098 // know by construction that we're calling from a derived class. 6099 if (CopyingBaseSubobject) { 6100 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6101 L != LEnd; ++L) { 6102 if (L.getAccess() == AS_protected) 6103 L.setAccess(AS_public); 6104 } 6105 } 6106 6107 // Create the nested-name-specifier that will be used to qualify the 6108 // reference to operator=; this is required to suppress the virtual 6109 // call mechanism. 6110 CXXScopeSpec SS; 6111 SS.MakeTrivial(S.Context, 6112 NestedNameSpecifier::Create(S.Context, 0, false, 6113 T.getTypePtr()), 6114 Loc); 6115 6116 // Create the reference to operator=. 6117 ExprResult OpEqualRef 6118 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6119 /*FirstQualifierInScope=*/0, OpLookup, 6120 /*TemplateArgs=*/0, 6121 /*SuppressQualifierCheck=*/true); 6122 if (OpEqualRef.isInvalid()) 6123 return StmtError(); 6124 6125 // Build the call to the assignment operator. 6126 6127 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6128 OpEqualRef.takeAs<Expr>(), 6129 Loc, &From, 1, Loc); 6130 if (Call.isInvalid()) 6131 return StmtError(); 6132 6133 return S.Owned(Call.takeAs<Stmt>()); 6134 } 6135 6136 // - if the subobject is of scalar type, the built-in assignment 6137 // operator is used. 6138 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6139 if (!ArrayTy) { 6140 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6141 if (Assignment.isInvalid()) 6142 return StmtError(); 6143 6144 return S.Owned(Assignment.takeAs<Stmt>()); 6145 } 6146 6147 // - if the subobject is an array, each element is assigned, in the 6148 // manner appropriate to the element type; 6149 6150 // Construct a loop over the array bounds, e.g., 6151 // 6152 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6153 // 6154 // that will copy each of the array elements. 6155 QualType SizeType = S.Context.getSizeType(); 6156 6157 // Create the iteration variable. 6158 IdentifierInfo *IterationVarName = 0; 6159 { 6160 llvm::SmallString<8> Str; 6161 llvm::raw_svector_ostream OS(Str); 6162 OS << "__i" << Depth; 6163 IterationVarName = &S.Context.Idents.get(OS.str()); 6164 } 6165 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6166 IterationVarName, SizeType, 6167 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6168 SC_None, SC_None); 6169 6170 // Initialize the iteration variable to zero. 6171 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6172 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6173 6174 // Create a reference to the iteration variable; we'll use this several 6175 // times throughout. 6176 Expr *IterationVarRef 6177 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6178 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6179 6180 // Create the DeclStmt that holds the iteration variable. 6181 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6182 6183 // Create the comparison against the array bound. 6184 llvm::APInt Upper 6185 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6186 Expr *Comparison 6187 = new (S.Context) BinaryOperator(IterationVarRef, 6188 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6189 BO_NE, S.Context.BoolTy, 6190 VK_RValue, OK_Ordinary, Loc); 6191 6192 // Create the pre-increment of the iteration variable. 6193 Expr *Increment 6194 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6195 VK_LValue, OK_Ordinary, Loc); 6196 6197 // Subscript the "from" and "to" expressions with the iteration variable. 6198 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6199 IterationVarRef, Loc)); 6200 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6201 IterationVarRef, Loc)); 6202 6203 // Build the copy for an individual element of the array. 6204 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6205 To, From, CopyingBaseSubobject, 6206 Depth + 1); 6207 if (Copy.isInvalid()) 6208 return StmtError(); 6209 6210 // Construct the loop that copies all elements of this array. 6211 return S.ActOnForStmt(Loc, Loc, InitStmt, 6212 S.MakeFullExpr(Comparison), 6213 0, S.MakeFullExpr(Increment), 6214 Loc, Copy.take()); 6215} 6216 6217/// \brief Determine whether the given class has a copy assignment operator 6218/// that accepts a const-qualified argument. 6219static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6220 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6221 6222 if (!Class->hasDeclaredCopyAssignment()) 6223 S.DeclareImplicitCopyAssignment(Class); 6224 6225 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6226 DeclarationName OpName 6227 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6228 6229 DeclContext::lookup_const_iterator Op, OpEnd; 6230 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6231 // C++ [class.copy]p9: 6232 // A user-declared copy assignment operator is a non-static non-template 6233 // member function of class X with exactly one parameter of type X, X&, 6234 // const X&, volatile X& or const volatile X&. 6235 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6236 if (!Method) 6237 continue; 6238 6239 if (Method->isStatic()) 6240 continue; 6241 if (Method->getPrimaryTemplate()) 6242 continue; 6243 const FunctionProtoType *FnType = 6244 Method->getType()->getAs<FunctionProtoType>(); 6245 assert(FnType && "Overloaded operator has no prototype."); 6246 // Don't assert on this; an invalid decl might have been left in the AST. 6247 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6248 continue; 6249 bool AcceptsConst = true; 6250 QualType ArgType = FnType->getArgType(0); 6251 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6252 ArgType = Ref->getPointeeType(); 6253 // Is it a non-const lvalue reference? 6254 if (!ArgType.isConstQualified()) 6255 AcceptsConst = false; 6256 } 6257 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6258 continue; 6259 6260 // We have a single argument of type cv X or cv X&, i.e. we've found the 6261 // copy assignment operator. Return whether it accepts const arguments. 6262 return AcceptsConst; 6263 } 6264 assert(Class->isInvalidDecl() && 6265 "No copy assignment operator declared in valid code."); 6266 return false; 6267} 6268 6269std::pair<Sema::ImplicitExceptionSpecification, bool> 6270Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6271 CXXRecordDecl *ClassDecl) { 6272 // C++ [class.copy]p10: 6273 // If the class definition does not explicitly declare a copy 6274 // assignment operator, one is declared implicitly. 6275 // The implicitly-defined copy assignment operator for a class X 6276 // will have the form 6277 // 6278 // X& X::operator=(const X&) 6279 // 6280 // if 6281 bool HasConstCopyAssignment = true; 6282 6283 // -- each direct base class B of X has a copy assignment operator 6284 // whose parameter is of type const B&, const volatile B& or B, 6285 // and 6286 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6287 BaseEnd = ClassDecl->bases_end(); 6288 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6289 assert(!Base->getType()->isDependentType() && 6290 "Cannot generate implicit members for class with dependent bases."); 6291 const CXXRecordDecl *BaseClassDecl 6292 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6293 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6294 } 6295 6296 // -- for all the nonstatic data members of X that are of a class 6297 // type M (or array thereof), each such class type has a copy 6298 // assignment operator whose parameter is of type const M&, 6299 // const volatile M& or M. 6300 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6301 FieldEnd = ClassDecl->field_end(); 6302 HasConstCopyAssignment && Field != FieldEnd; 6303 ++Field) { 6304 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6305 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6306 const CXXRecordDecl *FieldClassDecl 6307 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6308 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6309 } 6310 } 6311 6312 // Otherwise, the implicitly declared copy assignment operator will 6313 // have the form 6314 // 6315 // X& X::operator=(X&) 6316 6317 // C++ [except.spec]p14: 6318 // An implicitly declared special member function (Clause 12) shall have an 6319 // exception-specification. [...] 6320 ImplicitExceptionSpecification ExceptSpec(Context); 6321 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6322 BaseEnd = ClassDecl->bases_end(); 6323 Base != BaseEnd; ++Base) { 6324 CXXRecordDecl *BaseClassDecl 6325 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6326 6327 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6328 DeclareImplicitCopyAssignment(BaseClassDecl); 6329 6330 if (CXXMethodDecl *CopyAssign 6331 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6332 ExceptSpec.CalledDecl(CopyAssign); 6333 } 6334 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6335 FieldEnd = ClassDecl->field_end(); 6336 Field != FieldEnd; 6337 ++Field) { 6338 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6339 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6340 CXXRecordDecl *FieldClassDecl 6341 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6342 6343 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6344 DeclareImplicitCopyAssignment(FieldClassDecl); 6345 6346 if (CXXMethodDecl *CopyAssign 6347 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6348 ExceptSpec.CalledDecl(CopyAssign); 6349 } 6350 } 6351 6352 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6353} 6354 6355CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6356 // Note: The following rules are largely analoguous to the copy 6357 // constructor rules. Note that virtual bases are not taken into account 6358 // for determining the argument type of the operator. Note also that 6359 // operators taking an object instead of a reference are allowed. 6360 6361 ImplicitExceptionSpecification Spec(Context); 6362 bool Const; 6363 llvm::tie(Spec, Const) = 6364 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6365 6366 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6367 QualType RetType = Context.getLValueReferenceType(ArgType); 6368 if (Const) 6369 ArgType = ArgType.withConst(); 6370 ArgType = Context.getLValueReferenceType(ArgType); 6371 6372 // An implicitly-declared copy assignment operator is an inline public 6373 // member of its class. 6374 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6375 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6376 SourceLocation ClassLoc = ClassDecl->getLocation(); 6377 DeclarationNameInfo NameInfo(Name, ClassLoc); 6378 CXXMethodDecl *CopyAssignment 6379 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6380 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6381 /*TInfo=*/0, /*isStatic=*/false, 6382 /*StorageClassAsWritten=*/SC_None, 6383 /*isInline=*/true, 6384 SourceLocation()); 6385 CopyAssignment->setAccess(AS_public); 6386 CopyAssignment->setImplicit(); 6387 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6388 6389 // Add the parameter to the operator. 6390 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6391 ClassLoc, ClassLoc, /*Id=*/0, 6392 ArgType, /*TInfo=*/0, 6393 SC_None, 6394 SC_None, 0); 6395 CopyAssignment->setParams(&FromParam, 1); 6396 6397 // Note that we have added this copy-assignment operator. 6398 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6399 6400 if (Scope *S = getScopeForContext(ClassDecl)) 6401 PushOnScopeChains(CopyAssignment, S, false); 6402 ClassDecl->addDecl(CopyAssignment); 6403 6404 AddOverriddenMethods(ClassDecl, CopyAssignment); 6405 return CopyAssignment; 6406} 6407 6408void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6409 CXXMethodDecl *CopyAssignOperator) { 6410 assert((CopyAssignOperator->isImplicit() && 6411 CopyAssignOperator->isOverloadedOperator() && 6412 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6413 !CopyAssignOperator->isUsed(false)) && 6414 "DefineImplicitCopyAssignment called for wrong function"); 6415 6416 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6417 6418 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6419 CopyAssignOperator->setInvalidDecl(); 6420 return; 6421 } 6422 6423 CopyAssignOperator->setUsed(); 6424 6425 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6426 DiagnosticErrorTrap Trap(Diags); 6427 6428 // C++0x [class.copy]p30: 6429 // The implicitly-defined or explicitly-defaulted copy assignment operator 6430 // for a non-union class X performs memberwise copy assignment of its 6431 // subobjects. The direct base classes of X are assigned first, in the 6432 // order of their declaration in the base-specifier-list, and then the 6433 // immediate non-static data members of X are assigned, in the order in 6434 // which they were declared in the class definition. 6435 6436 // The statements that form the synthesized function body. 6437 ASTOwningVector<Stmt*> Statements(*this); 6438 6439 // The parameter for the "other" object, which we are copying from. 6440 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6441 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6442 QualType OtherRefType = Other->getType(); 6443 if (const LValueReferenceType *OtherRef 6444 = OtherRefType->getAs<LValueReferenceType>()) { 6445 OtherRefType = OtherRef->getPointeeType(); 6446 OtherQuals = OtherRefType.getQualifiers(); 6447 } 6448 6449 // Our location for everything implicitly-generated. 6450 SourceLocation Loc = CopyAssignOperator->getLocation(); 6451 6452 // Construct a reference to the "other" object. We'll be using this 6453 // throughout the generated ASTs. 6454 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6455 assert(OtherRef && "Reference to parameter cannot fail!"); 6456 6457 // Construct the "this" pointer. We'll be using this throughout the generated 6458 // ASTs. 6459 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6460 assert(This && "Reference to this cannot fail!"); 6461 6462 // Assign base classes. 6463 bool Invalid = false; 6464 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6465 E = ClassDecl->bases_end(); Base != E; ++Base) { 6466 // Form the assignment: 6467 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6468 QualType BaseType = Base->getType().getUnqualifiedType(); 6469 if (!BaseType->isRecordType()) { 6470 Invalid = true; 6471 continue; 6472 } 6473 6474 CXXCastPath BasePath; 6475 BasePath.push_back(Base); 6476 6477 // Construct the "from" expression, which is an implicit cast to the 6478 // appropriately-qualified base type. 6479 Expr *From = OtherRef; 6480 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6481 CK_UncheckedDerivedToBase, 6482 VK_LValue, &BasePath).take(); 6483 6484 // Dereference "this". 6485 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6486 6487 // Implicitly cast "this" to the appropriately-qualified base type. 6488 To = ImpCastExprToType(To.take(), 6489 Context.getCVRQualifiedType(BaseType, 6490 CopyAssignOperator->getTypeQualifiers()), 6491 CK_UncheckedDerivedToBase, 6492 VK_LValue, &BasePath); 6493 6494 // Build the copy. 6495 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6496 To.get(), From, 6497 /*CopyingBaseSubobject=*/true); 6498 if (Copy.isInvalid()) { 6499 Diag(CurrentLocation, diag::note_member_synthesized_at) 6500 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6501 CopyAssignOperator->setInvalidDecl(); 6502 return; 6503 } 6504 6505 // Success! Record the copy. 6506 Statements.push_back(Copy.takeAs<Expr>()); 6507 } 6508 6509 // \brief Reference to the __builtin_memcpy function. 6510 Expr *BuiltinMemCpyRef = 0; 6511 // \brief Reference to the __builtin_objc_memmove_collectable function. 6512 Expr *CollectableMemCpyRef = 0; 6513 6514 // Assign non-static members. 6515 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6516 FieldEnd = ClassDecl->field_end(); 6517 Field != FieldEnd; ++Field) { 6518 // Check for members of reference type; we can't copy those. 6519 if (Field->getType()->isReferenceType()) { 6520 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6521 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6522 Diag(Field->getLocation(), diag::note_declared_at); 6523 Diag(CurrentLocation, diag::note_member_synthesized_at) 6524 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6525 Invalid = true; 6526 continue; 6527 } 6528 6529 // Check for members of const-qualified, non-class type. 6530 QualType BaseType = Context.getBaseElementType(Field->getType()); 6531 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6532 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6533 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6534 Diag(Field->getLocation(), diag::note_declared_at); 6535 Diag(CurrentLocation, diag::note_member_synthesized_at) 6536 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6537 Invalid = true; 6538 continue; 6539 } 6540 6541 QualType FieldType = Field->getType().getNonReferenceType(); 6542 if (FieldType->isIncompleteArrayType()) { 6543 assert(ClassDecl->hasFlexibleArrayMember() && 6544 "Incomplete array type is not valid"); 6545 continue; 6546 } 6547 6548 // Build references to the field in the object we're copying from and to. 6549 CXXScopeSpec SS; // Intentionally empty 6550 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6551 LookupMemberName); 6552 MemberLookup.addDecl(*Field); 6553 MemberLookup.resolveKind(); 6554 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6555 Loc, /*IsArrow=*/false, 6556 SS, 0, MemberLookup, 0); 6557 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6558 Loc, /*IsArrow=*/true, 6559 SS, 0, MemberLookup, 0); 6560 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6561 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6562 6563 // If the field should be copied with __builtin_memcpy rather than via 6564 // explicit assignments, do so. This optimization only applies for arrays 6565 // of scalars and arrays of class type with trivial copy-assignment 6566 // operators. 6567 if (FieldType->isArrayType() && 6568 (!BaseType->isRecordType() || 6569 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6570 ->hasTrivialCopyAssignment())) { 6571 // Compute the size of the memory buffer to be copied. 6572 QualType SizeType = Context.getSizeType(); 6573 llvm::APInt Size(Context.getTypeSize(SizeType), 6574 Context.getTypeSizeInChars(BaseType).getQuantity()); 6575 for (const ConstantArrayType *Array 6576 = Context.getAsConstantArrayType(FieldType); 6577 Array; 6578 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6579 llvm::APInt ArraySize 6580 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6581 Size *= ArraySize; 6582 } 6583 6584 // Take the address of the field references for "from" and "to". 6585 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6586 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6587 6588 bool NeedsCollectableMemCpy = 6589 (BaseType->isRecordType() && 6590 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6591 6592 if (NeedsCollectableMemCpy) { 6593 if (!CollectableMemCpyRef) { 6594 // Create a reference to the __builtin_objc_memmove_collectable function. 6595 LookupResult R(*this, 6596 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6597 Loc, LookupOrdinaryName); 6598 LookupName(R, TUScope, true); 6599 6600 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6601 if (!CollectableMemCpy) { 6602 // Something went horribly wrong earlier, and we will have 6603 // complained about it. 6604 Invalid = true; 6605 continue; 6606 } 6607 6608 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6609 CollectableMemCpy->getType(), 6610 VK_LValue, Loc, 0).take(); 6611 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6612 } 6613 } 6614 // Create a reference to the __builtin_memcpy builtin function. 6615 else if (!BuiltinMemCpyRef) { 6616 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6617 LookupOrdinaryName); 6618 LookupName(R, TUScope, true); 6619 6620 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6621 if (!BuiltinMemCpy) { 6622 // Something went horribly wrong earlier, and we will have complained 6623 // about it. 6624 Invalid = true; 6625 continue; 6626 } 6627 6628 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6629 BuiltinMemCpy->getType(), 6630 VK_LValue, Loc, 0).take(); 6631 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6632 } 6633 6634 ASTOwningVector<Expr*> CallArgs(*this); 6635 CallArgs.push_back(To.takeAs<Expr>()); 6636 CallArgs.push_back(From.takeAs<Expr>()); 6637 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6638 ExprResult Call = ExprError(); 6639 if (NeedsCollectableMemCpy) 6640 Call = ActOnCallExpr(/*Scope=*/0, 6641 CollectableMemCpyRef, 6642 Loc, move_arg(CallArgs), 6643 Loc); 6644 else 6645 Call = ActOnCallExpr(/*Scope=*/0, 6646 BuiltinMemCpyRef, 6647 Loc, move_arg(CallArgs), 6648 Loc); 6649 6650 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6651 Statements.push_back(Call.takeAs<Expr>()); 6652 continue; 6653 } 6654 6655 // Build the copy of this field. 6656 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6657 To.get(), From.get(), 6658 /*CopyingBaseSubobject=*/false); 6659 if (Copy.isInvalid()) { 6660 Diag(CurrentLocation, diag::note_member_synthesized_at) 6661 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6662 CopyAssignOperator->setInvalidDecl(); 6663 return; 6664 } 6665 6666 // Success! Record the copy. 6667 Statements.push_back(Copy.takeAs<Stmt>()); 6668 } 6669 6670 if (!Invalid) { 6671 // Add a "return *this;" 6672 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6673 6674 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6675 if (Return.isInvalid()) 6676 Invalid = true; 6677 else { 6678 Statements.push_back(Return.takeAs<Stmt>()); 6679 6680 if (Trap.hasErrorOccurred()) { 6681 Diag(CurrentLocation, diag::note_member_synthesized_at) 6682 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6683 Invalid = true; 6684 } 6685 } 6686 } 6687 6688 if (Invalid) { 6689 CopyAssignOperator->setInvalidDecl(); 6690 return; 6691 } 6692 6693 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6694 /*isStmtExpr=*/false); 6695 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6696 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6697 6698 if (ASTMutationListener *L = getASTMutationListener()) { 6699 L->CompletedImplicitDefinition(CopyAssignOperator); 6700 } 6701} 6702 6703std::pair<Sema::ImplicitExceptionSpecification, bool> 6704Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 6705 // C++ [class.copy]p5: 6706 // The implicitly-declared copy constructor for a class X will 6707 // have the form 6708 // 6709 // X::X(const X&) 6710 // 6711 // if 6712 bool HasConstCopyConstructor = true; 6713 6714 // -- each direct or virtual base class B of X has a copy 6715 // constructor whose first parameter is of type const B& or 6716 // const volatile B&, and 6717 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6718 BaseEnd = ClassDecl->bases_end(); 6719 HasConstCopyConstructor && Base != BaseEnd; 6720 ++Base) { 6721 // Virtual bases are handled below. 6722 if (Base->isVirtual()) 6723 continue; 6724 6725 CXXRecordDecl *BaseClassDecl 6726 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6727 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6728 DeclareImplicitCopyConstructor(BaseClassDecl); 6729 6730 HasConstCopyConstructor 6731 = BaseClassDecl->hasConstCopyConstructor(Context); 6732 } 6733 6734 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6735 BaseEnd = ClassDecl->vbases_end(); 6736 HasConstCopyConstructor && Base != BaseEnd; 6737 ++Base) { 6738 CXXRecordDecl *BaseClassDecl 6739 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6740 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6741 DeclareImplicitCopyConstructor(BaseClassDecl); 6742 6743 HasConstCopyConstructor 6744 = BaseClassDecl->hasConstCopyConstructor(Context); 6745 } 6746 6747 // -- for all the nonstatic data members of X that are of a 6748 // class type M (or array thereof), each such class type 6749 // has a copy constructor whose first parameter is of type 6750 // const M& or const volatile M&. 6751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6752 FieldEnd = ClassDecl->field_end(); 6753 HasConstCopyConstructor && Field != FieldEnd; 6754 ++Field) { 6755 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6756 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6757 CXXRecordDecl *FieldClassDecl 6758 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6759 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6760 DeclareImplicitCopyConstructor(FieldClassDecl); 6761 6762 HasConstCopyConstructor 6763 = FieldClassDecl->hasConstCopyConstructor(Context); 6764 } 6765 } 6766 // Otherwise, the implicitly declared copy constructor will have 6767 // the form 6768 // 6769 // X::X(X&) 6770 6771 // C++ [except.spec]p14: 6772 // An implicitly declared special member function (Clause 12) shall have an 6773 // exception-specification. [...] 6774 ImplicitExceptionSpecification ExceptSpec(Context); 6775 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6776 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6777 BaseEnd = ClassDecl->bases_end(); 6778 Base != BaseEnd; 6779 ++Base) { 6780 // Virtual bases are handled below. 6781 if (Base->isVirtual()) 6782 continue; 6783 6784 CXXRecordDecl *BaseClassDecl 6785 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6786 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6787 DeclareImplicitCopyConstructor(BaseClassDecl); 6788 6789 if (CXXConstructorDecl *CopyConstructor 6790 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6791 ExceptSpec.CalledDecl(CopyConstructor); 6792 } 6793 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6794 BaseEnd = ClassDecl->vbases_end(); 6795 Base != BaseEnd; 6796 ++Base) { 6797 CXXRecordDecl *BaseClassDecl 6798 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6799 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6800 DeclareImplicitCopyConstructor(BaseClassDecl); 6801 6802 if (CXXConstructorDecl *CopyConstructor 6803 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6804 ExceptSpec.CalledDecl(CopyConstructor); 6805 } 6806 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6807 FieldEnd = ClassDecl->field_end(); 6808 Field != FieldEnd; 6809 ++Field) { 6810 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6811 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6812 CXXRecordDecl *FieldClassDecl 6813 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6814 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6815 DeclareImplicitCopyConstructor(FieldClassDecl); 6816 6817 if (CXXConstructorDecl *CopyConstructor 6818 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6819 ExceptSpec.CalledDecl(CopyConstructor); 6820 } 6821 } 6822 6823 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 6824} 6825 6826CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 6827 CXXRecordDecl *ClassDecl) { 6828 // C++ [class.copy]p4: 6829 // If the class definition does not explicitly declare a copy 6830 // constructor, one is declared implicitly. 6831 6832 ImplicitExceptionSpecification Spec(Context); 6833 bool Const; 6834 llvm::tie(Spec, Const) = 6835 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 6836 6837 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6838 QualType ArgType = ClassType; 6839 if (Const) 6840 ArgType = ArgType.withConst(); 6841 ArgType = Context.getLValueReferenceType(ArgType); 6842 6843 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6844 6845 DeclarationName Name 6846 = Context.DeclarationNames.getCXXConstructorName( 6847 Context.getCanonicalType(ClassType)); 6848 SourceLocation ClassLoc = ClassDecl->getLocation(); 6849 DeclarationNameInfo NameInfo(Name, ClassLoc); 6850 6851 // An implicitly-declared copy constructor is an inline public 6852 // member of its class. 6853 CXXConstructorDecl *CopyConstructor 6854 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6855 Context.getFunctionType(Context.VoidTy, 6856 &ArgType, 1, EPI), 6857 /*TInfo=*/0, 6858 /*isExplicit=*/false, 6859 /*isInline=*/true, 6860 /*isImplicitlyDeclared=*/true); 6861 CopyConstructor->setAccess(AS_public); 6862 CopyConstructor->setDefaulted(); 6863 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6864 6865 // Note that we have declared this constructor. 6866 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6867 6868 // Add the parameter to the constructor. 6869 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6870 ClassLoc, ClassLoc, 6871 /*IdentifierInfo=*/0, 6872 ArgType, /*TInfo=*/0, 6873 SC_None, 6874 SC_None, 0); 6875 CopyConstructor->setParams(&FromParam, 1); 6876 6877 if (ShouldDeleteCopyConstructor(CopyConstructor)) 6878 CopyConstructor->setDeletedAsWritten(); 6879 6880 if (Scope *S = getScopeForContext(ClassDecl)) 6881 PushOnScopeChains(CopyConstructor, S, false); 6882 ClassDecl->addDecl(CopyConstructor); 6883 6884 return CopyConstructor; 6885} 6886 6887void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6888 CXXConstructorDecl *CopyConstructor) { 6889 assert((CopyConstructor->isDefaulted() && 6890 CopyConstructor->isCopyConstructor() && 6891 !CopyConstructor->isUsed(false)) && 6892 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6893 6894 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6895 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6896 6897 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6898 DiagnosticErrorTrap Trap(Diags); 6899 6900 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6901 Trap.hasErrorOccurred()) { 6902 Diag(CurrentLocation, diag::note_member_synthesized_at) 6903 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6904 CopyConstructor->setInvalidDecl(); 6905 } else { 6906 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6907 CopyConstructor->getLocation(), 6908 MultiStmtArg(*this, 0, 0), 6909 /*isStmtExpr=*/false) 6910 .takeAs<Stmt>()); 6911 } 6912 6913 CopyConstructor->setUsed(); 6914 6915 if (ASTMutationListener *L = getASTMutationListener()) { 6916 L->CompletedImplicitDefinition(CopyConstructor); 6917 } 6918} 6919 6920ExprResult 6921Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6922 CXXConstructorDecl *Constructor, 6923 MultiExprArg ExprArgs, 6924 bool RequiresZeroInit, 6925 unsigned ConstructKind, 6926 SourceRange ParenRange) { 6927 bool Elidable = false; 6928 6929 // C++0x [class.copy]p34: 6930 // When certain criteria are met, an implementation is allowed to 6931 // omit the copy/move construction of a class object, even if the 6932 // copy/move constructor and/or destructor for the object have 6933 // side effects. [...] 6934 // - when a temporary class object that has not been bound to a 6935 // reference (12.2) would be copied/moved to a class object 6936 // with the same cv-unqualified type, the copy/move operation 6937 // can be omitted by constructing the temporary object 6938 // directly into the target of the omitted copy/move 6939 if (ConstructKind == CXXConstructExpr::CK_Complete && 6940 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6941 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6942 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6943 } 6944 6945 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6946 Elidable, move(ExprArgs), RequiresZeroInit, 6947 ConstructKind, ParenRange); 6948} 6949 6950/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6951/// including handling of its default argument expressions. 6952ExprResult 6953Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6954 CXXConstructorDecl *Constructor, bool Elidable, 6955 MultiExprArg ExprArgs, 6956 bool RequiresZeroInit, 6957 unsigned ConstructKind, 6958 SourceRange ParenRange) { 6959 unsigned NumExprs = ExprArgs.size(); 6960 Expr **Exprs = (Expr **)ExprArgs.release(); 6961 6962 for (specific_attr_iterator<NonNullAttr> 6963 i = Constructor->specific_attr_begin<NonNullAttr>(), 6964 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6965 const NonNullAttr *NonNull = *i; 6966 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6967 } 6968 6969 MarkDeclarationReferenced(ConstructLoc, Constructor); 6970 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6971 Constructor, Elidable, Exprs, NumExprs, 6972 RequiresZeroInit, 6973 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6974 ParenRange)); 6975} 6976 6977bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6978 CXXConstructorDecl *Constructor, 6979 MultiExprArg Exprs) { 6980 // FIXME: Provide the correct paren SourceRange when available. 6981 ExprResult TempResult = 6982 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6983 move(Exprs), false, CXXConstructExpr::CK_Complete, 6984 SourceRange()); 6985 if (TempResult.isInvalid()) 6986 return true; 6987 6988 Expr *Temp = TempResult.takeAs<Expr>(); 6989 CheckImplicitConversions(Temp, VD->getLocation()); 6990 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6991 Temp = MaybeCreateExprWithCleanups(Temp); 6992 VD->setInit(Temp); 6993 6994 return false; 6995} 6996 6997void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6998 if (VD->isInvalidDecl()) return; 6999 7000 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7001 if (ClassDecl->isInvalidDecl()) return; 7002 if (ClassDecl->hasTrivialDestructor()) return; 7003 if (ClassDecl->isDependentContext()) return; 7004 7005 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7006 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7007 CheckDestructorAccess(VD->getLocation(), Destructor, 7008 PDiag(diag::err_access_dtor_var) 7009 << VD->getDeclName() 7010 << VD->getType()); 7011 7012 if (!VD->hasGlobalStorage()) return; 7013 7014 // Emit warning for non-trivial dtor in global scope (a real global, 7015 // class-static, function-static). 7016 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7017 7018 // TODO: this should be re-enabled for static locals by !CXAAtExit 7019 if (!VD->isStaticLocal()) 7020 Diag(VD->getLocation(), diag::warn_global_destructor); 7021} 7022 7023/// AddCXXDirectInitializerToDecl - This action is called immediately after 7024/// ActOnDeclarator, when a C++ direct initializer is present. 7025/// e.g: "int x(1);" 7026void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7027 SourceLocation LParenLoc, 7028 MultiExprArg Exprs, 7029 SourceLocation RParenLoc, 7030 bool TypeMayContainAuto) { 7031 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7032 7033 // If there is no declaration, there was an error parsing it. Just ignore 7034 // the initializer. 7035 if (RealDecl == 0) 7036 return; 7037 7038 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7039 if (!VDecl) { 7040 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7041 RealDecl->setInvalidDecl(); 7042 return; 7043 } 7044 7045 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7046 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7047 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7048 if (Exprs.size() > 1) { 7049 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7050 diag::err_auto_var_init_multiple_expressions) 7051 << VDecl->getDeclName() << VDecl->getType() 7052 << VDecl->getSourceRange(); 7053 RealDecl->setInvalidDecl(); 7054 return; 7055 } 7056 7057 Expr *Init = Exprs.get()[0]; 7058 TypeSourceInfo *DeducedType = 0; 7059 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7060 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7061 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7062 << Init->getSourceRange(); 7063 if (!DeducedType) { 7064 RealDecl->setInvalidDecl(); 7065 return; 7066 } 7067 VDecl->setTypeSourceInfo(DeducedType); 7068 VDecl->setType(DeducedType->getType()); 7069 7070 // If this is a redeclaration, check that the type we just deduced matches 7071 // the previously declared type. 7072 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7073 MergeVarDeclTypes(VDecl, Old); 7074 } 7075 7076 // We will represent direct-initialization similarly to copy-initialization: 7077 // int x(1); -as-> int x = 1; 7078 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7079 // 7080 // Clients that want to distinguish between the two forms, can check for 7081 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7082 // A major benefit is that clients that don't particularly care about which 7083 // exactly form was it (like the CodeGen) can handle both cases without 7084 // special case code. 7085 7086 // C++ 8.5p11: 7087 // The form of initialization (using parentheses or '=') is generally 7088 // insignificant, but does matter when the entity being initialized has a 7089 // class type. 7090 7091 if (!VDecl->getType()->isDependentType() && 7092 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7093 diag::err_typecheck_decl_incomplete_type)) { 7094 VDecl->setInvalidDecl(); 7095 return; 7096 } 7097 7098 // The variable can not have an abstract class type. 7099 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7100 diag::err_abstract_type_in_decl, 7101 AbstractVariableType)) 7102 VDecl->setInvalidDecl(); 7103 7104 const VarDecl *Def; 7105 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7106 Diag(VDecl->getLocation(), diag::err_redefinition) 7107 << VDecl->getDeclName(); 7108 Diag(Def->getLocation(), diag::note_previous_definition); 7109 VDecl->setInvalidDecl(); 7110 return; 7111 } 7112 7113 // C++ [class.static.data]p4 7114 // If a static data member is of const integral or const 7115 // enumeration type, its declaration in the class definition can 7116 // specify a constant-initializer which shall be an integral 7117 // constant expression (5.19). In that case, the member can appear 7118 // in integral constant expressions. The member shall still be 7119 // defined in a namespace scope if it is used in the program and the 7120 // namespace scope definition shall not contain an initializer. 7121 // 7122 // We already performed a redefinition check above, but for static 7123 // data members we also need to check whether there was an in-class 7124 // declaration with an initializer. 7125 const VarDecl* PrevInit = 0; 7126 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7127 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7128 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7129 return; 7130 } 7131 7132 bool IsDependent = false; 7133 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7134 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7135 VDecl->setInvalidDecl(); 7136 return; 7137 } 7138 7139 if (Exprs.get()[I]->isTypeDependent()) 7140 IsDependent = true; 7141 } 7142 7143 // If either the declaration has a dependent type or if any of the 7144 // expressions is type-dependent, we represent the initialization 7145 // via a ParenListExpr for later use during template instantiation. 7146 if (VDecl->getType()->isDependentType() || IsDependent) { 7147 // Let clients know that initialization was done with a direct initializer. 7148 VDecl->setCXXDirectInitializer(true); 7149 7150 // Store the initialization expressions as a ParenListExpr. 7151 unsigned NumExprs = Exprs.size(); 7152 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7153 (Expr **)Exprs.release(), 7154 NumExprs, RParenLoc)); 7155 return; 7156 } 7157 7158 // Capture the variable that is being initialized and the style of 7159 // initialization. 7160 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7161 7162 // FIXME: Poor source location information. 7163 InitializationKind Kind 7164 = InitializationKind::CreateDirect(VDecl->getLocation(), 7165 LParenLoc, RParenLoc); 7166 7167 InitializationSequence InitSeq(*this, Entity, Kind, 7168 Exprs.get(), Exprs.size()); 7169 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7170 if (Result.isInvalid()) { 7171 VDecl->setInvalidDecl(); 7172 return; 7173 } 7174 7175 CheckImplicitConversions(Result.get(), LParenLoc); 7176 7177 Result = MaybeCreateExprWithCleanups(Result); 7178 VDecl->setInit(Result.takeAs<Expr>()); 7179 VDecl->setCXXDirectInitializer(true); 7180 7181 CheckCompleteVariableDeclaration(VDecl); 7182} 7183 7184/// \brief Given a constructor and the set of arguments provided for the 7185/// constructor, convert the arguments and add any required default arguments 7186/// to form a proper call to this constructor. 7187/// 7188/// \returns true if an error occurred, false otherwise. 7189bool 7190Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7191 MultiExprArg ArgsPtr, 7192 SourceLocation Loc, 7193 ASTOwningVector<Expr*> &ConvertedArgs) { 7194 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7195 unsigned NumArgs = ArgsPtr.size(); 7196 Expr **Args = (Expr **)ArgsPtr.get(); 7197 7198 const FunctionProtoType *Proto 7199 = Constructor->getType()->getAs<FunctionProtoType>(); 7200 assert(Proto && "Constructor without a prototype?"); 7201 unsigned NumArgsInProto = Proto->getNumArgs(); 7202 7203 // If too few arguments are available, we'll fill in the rest with defaults. 7204 if (NumArgs < NumArgsInProto) 7205 ConvertedArgs.reserve(NumArgsInProto); 7206 else 7207 ConvertedArgs.reserve(NumArgs); 7208 7209 VariadicCallType CallType = 7210 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7211 llvm::SmallVector<Expr *, 8> AllArgs; 7212 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7213 Proto, 0, Args, NumArgs, AllArgs, 7214 CallType); 7215 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7216 ConvertedArgs.push_back(AllArgs[i]); 7217 return Invalid; 7218} 7219 7220static inline bool 7221CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7222 const FunctionDecl *FnDecl) { 7223 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7224 if (isa<NamespaceDecl>(DC)) { 7225 return SemaRef.Diag(FnDecl->getLocation(), 7226 diag::err_operator_new_delete_declared_in_namespace) 7227 << FnDecl->getDeclName(); 7228 } 7229 7230 if (isa<TranslationUnitDecl>(DC) && 7231 FnDecl->getStorageClass() == SC_Static) { 7232 return SemaRef.Diag(FnDecl->getLocation(), 7233 diag::err_operator_new_delete_declared_static) 7234 << FnDecl->getDeclName(); 7235 } 7236 7237 return false; 7238} 7239 7240static inline bool 7241CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7242 CanQualType ExpectedResultType, 7243 CanQualType ExpectedFirstParamType, 7244 unsigned DependentParamTypeDiag, 7245 unsigned InvalidParamTypeDiag) { 7246 QualType ResultType = 7247 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7248 7249 // Check that the result type is not dependent. 7250 if (ResultType->isDependentType()) 7251 return SemaRef.Diag(FnDecl->getLocation(), 7252 diag::err_operator_new_delete_dependent_result_type) 7253 << FnDecl->getDeclName() << ExpectedResultType; 7254 7255 // Check that the result type is what we expect. 7256 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7257 return SemaRef.Diag(FnDecl->getLocation(), 7258 diag::err_operator_new_delete_invalid_result_type) 7259 << FnDecl->getDeclName() << ExpectedResultType; 7260 7261 // A function template must have at least 2 parameters. 7262 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7263 return SemaRef.Diag(FnDecl->getLocation(), 7264 diag::err_operator_new_delete_template_too_few_parameters) 7265 << FnDecl->getDeclName(); 7266 7267 // The function decl must have at least 1 parameter. 7268 if (FnDecl->getNumParams() == 0) 7269 return SemaRef.Diag(FnDecl->getLocation(), 7270 diag::err_operator_new_delete_too_few_parameters) 7271 << FnDecl->getDeclName(); 7272 7273 // Check the the first parameter type is not dependent. 7274 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7275 if (FirstParamType->isDependentType()) 7276 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7277 << FnDecl->getDeclName() << ExpectedFirstParamType; 7278 7279 // Check that the first parameter type is what we expect. 7280 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7281 ExpectedFirstParamType) 7282 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7283 << FnDecl->getDeclName() << ExpectedFirstParamType; 7284 7285 return false; 7286} 7287 7288static bool 7289CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7290 // C++ [basic.stc.dynamic.allocation]p1: 7291 // A program is ill-formed if an allocation function is declared in a 7292 // namespace scope other than global scope or declared static in global 7293 // scope. 7294 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7295 return true; 7296 7297 CanQualType SizeTy = 7298 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7299 7300 // C++ [basic.stc.dynamic.allocation]p1: 7301 // The return type shall be void*. The first parameter shall have type 7302 // std::size_t. 7303 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7304 SizeTy, 7305 diag::err_operator_new_dependent_param_type, 7306 diag::err_operator_new_param_type)) 7307 return true; 7308 7309 // C++ [basic.stc.dynamic.allocation]p1: 7310 // The first parameter shall not have an associated default argument. 7311 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7312 return SemaRef.Diag(FnDecl->getLocation(), 7313 diag::err_operator_new_default_arg) 7314 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7315 7316 return false; 7317} 7318 7319static bool 7320CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7321 // C++ [basic.stc.dynamic.deallocation]p1: 7322 // A program is ill-formed if deallocation functions are declared in a 7323 // namespace scope other than global scope or declared static in global 7324 // scope. 7325 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7326 return true; 7327 7328 // C++ [basic.stc.dynamic.deallocation]p2: 7329 // Each deallocation function shall return void and its first parameter 7330 // shall be void*. 7331 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7332 SemaRef.Context.VoidPtrTy, 7333 diag::err_operator_delete_dependent_param_type, 7334 diag::err_operator_delete_param_type)) 7335 return true; 7336 7337 return false; 7338} 7339 7340/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7341/// of this overloaded operator is well-formed. If so, returns false; 7342/// otherwise, emits appropriate diagnostics and returns true. 7343bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7344 assert(FnDecl && FnDecl->isOverloadedOperator() && 7345 "Expected an overloaded operator declaration"); 7346 7347 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7348 7349 // C++ [over.oper]p5: 7350 // The allocation and deallocation functions, operator new, 7351 // operator new[], operator delete and operator delete[], are 7352 // described completely in 3.7.3. The attributes and restrictions 7353 // found in the rest of this subclause do not apply to them unless 7354 // explicitly stated in 3.7.3. 7355 if (Op == OO_Delete || Op == OO_Array_Delete) 7356 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7357 7358 if (Op == OO_New || Op == OO_Array_New) 7359 return CheckOperatorNewDeclaration(*this, FnDecl); 7360 7361 // C++ [over.oper]p6: 7362 // An operator function shall either be a non-static member 7363 // function or be a non-member function and have at least one 7364 // parameter whose type is a class, a reference to a class, an 7365 // enumeration, or a reference to an enumeration. 7366 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7367 if (MethodDecl->isStatic()) 7368 return Diag(FnDecl->getLocation(), 7369 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7370 } else { 7371 bool ClassOrEnumParam = false; 7372 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7373 ParamEnd = FnDecl->param_end(); 7374 Param != ParamEnd; ++Param) { 7375 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7376 if (ParamType->isDependentType() || ParamType->isRecordType() || 7377 ParamType->isEnumeralType()) { 7378 ClassOrEnumParam = true; 7379 break; 7380 } 7381 } 7382 7383 if (!ClassOrEnumParam) 7384 return Diag(FnDecl->getLocation(), 7385 diag::err_operator_overload_needs_class_or_enum) 7386 << FnDecl->getDeclName(); 7387 } 7388 7389 // C++ [over.oper]p8: 7390 // An operator function cannot have default arguments (8.3.6), 7391 // except where explicitly stated below. 7392 // 7393 // Only the function-call operator allows default arguments 7394 // (C++ [over.call]p1). 7395 if (Op != OO_Call) { 7396 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7397 Param != FnDecl->param_end(); ++Param) { 7398 if ((*Param)->hasDefaultArg()) 7399 return Diag((*Param)->getLocation(), 7400 diag::err_operator_overload_default_arg) 7401 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7402 } 7403 } 7404 7405 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7406 { false, false, false } 7407#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7408 , { Unary, Binary, MemberOnly } 7409#include "clang/Basic/OperatorKinds.def" 7410 }; 7411 7412 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7413 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7414 bool MustBeMemberOperator = OperatorUses[Op][2]; 7415 7416 // C++ [over.oper]p8: 7417 // [...] Operator functions cannot have more or fewer parameters 7418 // than the number required for the corresponding operator, as 7419 // described in the rest of this subclause. 7420 unsigned NumParams = FnDecl->getNumParams() 7421 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7422 if (Op != OO_Call && 7423 ((NumParams == 1 && !CanBeUnaryOperator) || 7424 (NumParams == 2 && !CanBeBinaryOperator) || 7425 (NumParams < 1) || (NumParams > 2))) { 7426 // We have the wrong number of parameters. 7427 unsigned ErrorKind; 7428 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7429 ErrorKind = 2; // 2 -> unary or binary. 7430 } else if (CanBeUnaryOperator) { 7431 ErrorKind = 0; // 0 -> unary 7432 } else { 7433 assert(CanBeBinaryOperator && 7434 "All non-call overloaded operators are unary or binary!"); 7435 ErrorKind = 1; // 1 -> binary 7436 } 7437 7438 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7439 << FnDecl->getDeclName() << NumParams << ErrorKind; 7440 } 7441 7442 // Overloaded operators other than operator() cannot be variadic. 7443 if (Op != OO_Call && 7444 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7445 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7446 << FnDecl->getDeclName(); 7447 } 7448 7449 // Some operators must be non-static member functions. 7450 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7451 return Diag(FnDecl->getLocation(), 7452 diag::err_operator_overload_must_be_member) 7453 << FnDecl->getDeclName(); 7454 } 7455 7456 // C++ [over.inc]p1: 7457 // The user-defined function called operator++ implements the 7458 // prefix and postfix ++ operator. If this function is a member 7459 // function with no parameters, or a non-member function with one 7460 // parameter of class or enumeration type, it defines the prefix 7461 // increment operator ++ for objects of that type. If the function 7462 // is a member function with one parameter (which shall be of type 7463 // int) or a non-member function with two parameters (the second 7464 // of which shall be of type int), it defines the postfix 7465 // increment operator ++ for objects of that type. 7466 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7467 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7468 bool ParamIsInt = false; 7469 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7470 ParamIsInt = BT->getKind() == BuiltinType::Int; 7471 7472 if (!ParamIsInt) 7473 return Diag(LastParam->getLocation(), 7474 diag::err_operator_overload_post_incdec_must_be_int) 7475 << LastParam->getType() << (Op == OO_MinusMinus); 7476 } 7477 7478 return false; 7479} 7480 7481/// CheckLiteralOperatorDeclaration - Check whether the declaration 7482/// of this literal operator function is well-formed. If so, returns 7483/// false; otherwise, emits appropriate diagnostics and returns true. 7484bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7485 DeclContext *DC = FnDecl->getDeclContext(); 7486 Decl::Kind Kind = DC->getDeclKind(); 7487 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7488 Kind != Decl::LinkageSpec) { 7489 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7490 << FnDecl->getDeclName(); 7491 return true; 7492 } 7493 7494 bool Valid = false; 7495 7496 // template <char...> type operator "" name() is the only valid template 7497 // signature, and the only valid signature with no parameters. 7498 if (FnDecl->param_size() == 0) { 7499 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7500 // Must have only one template parameter 7501 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7502 if (Params->size() == 1) { 7503 NonTypeTemplateParmDecl *PmDecl = 7504 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7505 7506 // The template parameter must be a char parameter pack. 7507 if (PmDecl && PmDecl->isTemplateParameterPack() && 7508 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7509 Valid = true; 7510 } 7511 } 7512 } else { 7513 // Check the first parameter 7514 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7515 7516 QualType T = (*Param)->getType(); 7517 7518 // unsigned long long int, long double, and any character type are allowed 7519 // as the only parameters. 7520 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7521 Context.hasSameType(T, Context.LongDoubleTy) || 7522 Context.hasSameType(T, Context.CharTy) || 7523 Context.hasSameType(T, Context.WCharTy) || 7524 Context.hasSameType(T, Context.Char16Ty) || 7525 Context.hasSameType(T, Context.Char32Ty)) { 7526 if (++Param == FnDecl->param_end()) 7527 Valid = true; 7528 goto FinishedParams; 7529 } 7530 7531 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7532 const PointerType *PT = T->getAs<PointerType>(); 7533 if (!PT) 7534 goto FinishedParams; 7535 T = PT->getPointeeType(); 7536 if (!T.isConstQualified()) 7537 goto FinishedParams; 7538 T = T.getUnqualifiedType(); 7539 7540 // Move on to the second parameter; 7541 ++Param; 7542 7543 // If there is no second parameter, the first must be a const char * 7544 if (Param == FnDecl->param_end()) { 7545 if (Context.hasSameType(T, Context.CharTy)) 7546 Valid = true; 7547 goto FinishedParams; 7548 } 7549 7550 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7551 // are allowed as the first parameter to a two-parameter function 7552 if (!(Context.hasSameType(T, Context.CharTy) || 7553 Context.hasSameType(T, Context.WCharTy) || 7554 Context.hasSameType(T, Context.Char16Ty) || 7555 Context.hasSameType(T, Context.Char32Ty))) 7556 goto FinishedParams; 7557 7558 // The second and final parameter must be an std::size_t 7559 T = (*Param)->getType().getUnqualifiedType(); 7560 if (Context.hasSameType(T, Context.getSizeType()) && 7561 ++Param == FnDecl->param_end()) 7562 Valid = true; 7563 } 7564 7565 // FIXME: This diagnostic is absolutely terrible. 7566FinishedParams: 7567 if (!Valid) { 7568 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7569 << FnDecl->getDeclName(); 7570 return true; 7571 } 7572 7573 return false; 7574} 7575 7576/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7577/// linkage specification, including the language and (if present) 7578/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7579/// the location of the language string literal, which is provided 7580/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7581/// the '{' brace. Otherwise, this linkage specification does not 7582/// have any braces. 7583Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7584 SourceLocation LangLoc, 7585 llvm::StringRef Lang, 7586 SourceLocation LBraceLoc) { 7587 LinkageSpecDecl::LanguageIDs Language; 7588 if (Lang == "\"C\"") 7589 Language = LinkageSpecDecl::lang_c; 7590 else if (Lang == "\"C++\"") 7591 Language = LinkageSpecDecl::lang_cxx; 7592 else { 7593 Diag(LangLoc, diag::err_bad_language); 7594 return 0; 7595 } 7596 7597 // FIXME: Add all the various semantics of linkage specifications 7598 7599 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7600 ExternLoc, LangLoc, Language); 7601 CurContext->addDecl(D); 7602 PushDeclContext(S, D); 7603 return D; 7604} 7605 7606/// ActOnFinishLinkageSpecification - Complete the definition of 7607/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7608/// valid, it's the position of the closing '}' brace in a linkage 7609/// specification that uses braces. 7610Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7611 Decl *LinkageSpec, 7612 SourceLocation RBraceLoc) { 7613 if (LinkageSpec) { 7614 if (RBraceLoc.isValid()) { 7615 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7616 LSDecl->setRBraceLoc(RBraceLoc); 7617 } 7618 PopDeclContext(); 7619 } 7620 return LinkageSpec; 7621} 7622 7623/// \brief Perform semantic analysis for the variable declaration that 7624/// occurs within a C++ catch clause, returning the newly-created 7625/// variable. 7626VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7627 TypeSourceInfo *TInfo, 7628 SourceLocation StartLoc, 7629 SourceLocation Loc, 7630 IdentifierInfo *Name) { 7631 bool Invalid = false; 7632 QualType ExDeclType = TInfo->getType(); 7633 7634 // Arrays and functions decay. 7635 if (ExDeclType->isArrayType()) 7636 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7637 else if (ExDeclType->isFunctionType()) 7638 ExDeclType = Context.getPointerType(ExDeclType); 7639 7640 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7641 // The exception-declaration shall not denote a pointer or reference to an 7642 // incomplete type, other than [cv] void*. 7643 // N2844 forbids rvalue references. 7644 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7645 Diag(Loc, diag::err_catch_rvalue_ref); 7646 Invalid = true; 7647 } 7648 7649 // GCC allows catching pointers and references to incomplete types 7650 // as an extension; so do we, but we warn by default. 7651 7652 QualType BaseType = ExDeclType; 7653 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7654 unsigned DK = diag::err_catch_incomplete; 7655 bool IncompleteCatchIsInvalid = true; 7656 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7657 BaseType = Ptr->getPointeeType(); 7658 Mode = 1; 7659 DK = diag::ext_catch_incomplete_ptr; 7660 IncompleteCatchIsInvalid = false; 7661 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7662 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7663 BaseType = Ref->getPointeeType(); 7664 Mode = 2; 7665 DK = diag::ext_catch_incomplete_ref; 7666 IncompleteCatchIsInvalid = false; 7667 } 7668 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7669 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7670 IncompleteCatchIsInvalid) 7671 Invalid = true; 7672 7673 if (!Invalid && !ExDeclType->isDependentType() && 7674 RequireNonAbstractType(Loc, ExDeclType, 7675 diag::err_abstract_type_in_decl, 7676 AbstractVariableType)) 7677 Invalid = true; 7678 7679 // Only the non-fragile NeXT runtime currently supports C++ catches 7680 // of ObjC types, and no runtime supports catching ObjC types by value. 7681 if (!Invalid && getLangOptions().ObjC1) { 7682 QualType T = ExDeclType; 7683 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7684 T = RT->getPointeeType(); 7685 7686 if (T->isObjCObjectType()) { 7687 Diag(Loc, diag::err_objc_object_catch); 7688 Invalid = true; 7689 } else if (T->isObjCObjectPointerType()) { 7690 if (!getLangOptions().ObjCNonFragileABI) { 7691 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7692 Invalid = true; 7693 } 7694 } 7695 } 7696 7697 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7698 ExDeclType, TInfo, SC_None, SC_None); 7699 ExDecl->setExceptionVariable(true); 7700 7701 if (!Invalid) { 7702 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7703 // C++ [except.handle]p16: 7704 // The object declared in an exception-declaration or, if the 7705 // exception-declaration does not specify a name, a temporary (12.2) is 7706 // copy-initialized (8.5) from the exception object. [...] 7707 // The object is destroyed when the handler exits, after the destruction 7708 // of any automatic objects initialized within the handler. 7709 // 7710 // We just pretend to initialize the object with itself, then make sure 7711 // it can be destroyed later. 7712 QualType initType = ExDeclType; 7713 7714 InitializedEntity entity = 7715 InitializedEntity::InitializeVariable(ExDecl); 7716 InitializationKind initKind = 7717 InitializationKind::CreateCopy(Loc, SourceLocation()); 7718 7719 Expr *opaqueValue = 7720 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 7721 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 7722 ExprResult result = sequence.Perform(*this, entity, initKind, 7723 MultiExprArg(&opaqueValue, 1)); 7724 if (result.isInvalid()) 7725 Invalid = true; 7726 else { 7727 // If the constructor used was non-trivial, set this as the 7728 // "initializer". 7729 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 7730 if (!construct->getConstructor()->isTrivial()) { 7731 Expr *init = MaybeCreateExprWithCleanups(construct); 7732 ExDecl->setInit(init); 7733 } 7734 7735 // And make sure it's destructable. 7736 FinalizeVarWithDestructor(ExDecl, recordType); 7737 } 7738 } 7739 } 7740 7741 if (Invalid) 7742 ExDecl->setInvalidDecl(); 7743 7744 return ExDecl; 7745} 7746 7747/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7748/// handler. 7749Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7750 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7751 bool Invalid = D.isInvalidType(); 7752 7753 // Check for unexpanded parameter packs. 7754 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7755 UPPC_ExceptionType)) { 7756 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7757 D.getIdentifierLoc()); 7758 Invalid = true; 7759 } 7760 7761 IdentifierInfo *II = D.getIdentifier(); 7762 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7763 LookupOrdinaryName, 7764 ForRedeclaration)) { 7765 // The scope should be freshly made just for us. There is just no way 7766 // it contains any previous declaration. 7767 assert(!S->isDeclScope(PrevDecl)); 7768 if (PrevDecl->isTemplateParameter()) { 7769 // Maybe we will complain about the shadowed template parameter. 7770 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7771 } 7772 } 7773 7774 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7775 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7776 << D.getCXXScopeSpec().getRange(); 7777 Invalid = true; 7778 } 7779 7780 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7781 D.getSourceRange().getBegin(), 7782 D.getIdentifierLoc(), 7783 D.getIdentifier()); 7784 if (Invalid) 7785 ExDecl->setInvalidDecl(); 7786 7787 // Add the exception declaration into this scope. 7788 if (II) 7789 PushOnScopeChains(ExDecl, S); 7790 else 7791 CurContext->addDecl(ExDecl); 7792 7793 ProcessDeclAttributes(S, ExDecl, D); 7794 return ExDecl; 7795} 7796 7797Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7798 Expr *AssertExpr, 7799 Expr *AssertMessageExpr_, 7800 SourceLocation RParenLoc) { 7801 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7802 7803 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7804 llvm::APSInt Value(32); 7805 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7806 Diag(StaticAssertLoc, 7807 diag::err_static_assert_expression_is_not_constant) << 7808 AssertExpr->getSourceRange(); 7809 return 0; 7810 } 7811 7812 if (Value == 0) { 7813 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7814 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7815 } 7816 } 7817 7818 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7819 return 0; 7820 7821 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7822 AssertExpr, AssertMessage, RParenLoc); 7823 7824 CurContext->addDecl(Decl); 7825 return Decl; 7826} 7827 7828/// \brief Perform semantic analysis of the given friend type declaration. 7829/// 7830/// \returns A friend declaration that. 7831FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7832 TypeSourceInfo *TSInfo) { 7833 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7834 7835 QualType T = TSInfo->getType(); 7836 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7837 7838 if (!getLangOptions().CPlusPlus0x) { 7839 // C++03 [class.friend]p2: 7840 // An elaborated-type-specifier shall be used in a friend declaration 7841 // for a class.* 7842 // 7843 // * The class-key of the elaborated-type-specifier is required. 7844 if (!ActiveTemplateInstantiations.empty()) { 7845 // Do not complain about the form of friend template types during 7846 // template instantiation; we will already have complained when the 7847 // template was declared. 7848 } else if (!T->isElaboratedTypeSpecifier()) { 7849 // If we evaluated the type to a record type, suggest putting 7850 // a tag in front. 7851 if (const RecordType *RT = T->getAs<RecordType>()) { 7852 RecordDecl *RD = RT->getDecl(); 7853 7854 std::string InsertionText = std::string(" ") + RD->getKindName(); 7855 7856 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7857 << (unsigned) RD->getTagKind() 7858 << T 7859 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7860 InsertionText); 7861 } else { 7862 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7863 << T 7864 << SourceRange(FriendLoc, TypeRange.getEnd()); 7865 } 7866 } else if (T->getAs<EnumType>()) { 7867 Diag(FriendLoc, diag::ext_enum_friend) 7868 << T 7869 << SourceRange(FriendLoc, TypeRange.getEnd()); 7870 } 7871 } 7872 7873 // C++0x [class.friend]p3: 7874 // If the type specifier in a friend declaration designates a (possibly 7875 // cv-qualified) class type, that class is declared as a friend; otherwise, 7876 // the friend declaration is ignored. 7877 7878 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7879 // in [class.friend]p3 that we do not implement. 7880 7881 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7882} 7883 7884/// Handle a friend tag declaration where the scope specifier was 7885/// templated. 7886Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7887 unsigned TagSpec, SourceLocation TagLoc, 7888 CXXScopeSpec &SS, 7889 IdentifierInfo *Name, SourceLocation NameLoc, 7890 AttributeList *Attr, 7891 MultiTemplateParamsArg TempParamLists) { 7892 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7893 7894 bool isExplicitSpecialization = false; 7895 bool Invalid = false; 7896 7897 if (TemplateParameterList *TemplateParams 7898 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 7899 TempParamLists.get(), 7900 TempParamLists.size(), 7901 /*friend*/ true, 7902 isExplicitSpecialization, 7903 Invalid)) { 7904 if (TemplateParams->size() > 0) { 7905 // This is a declaration of a class template. 7906 if (Invalid) 7907 return 0; 7908 7909 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7910 SS, Name, NameLoc, Attr, 7911 TemplateParams, AS_public, 7912 TempParamLists.size() - 1, 7913 (TemplateParameterList**) TempParamLists.release()).take(); 7914 } else { 7915 // The "template<>" header is extraneous. 7916 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7917 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7918 isExplicitSpecialization = true; 7919 } 7920 } 7921 7922 if (Invalid) return 0; 7923 7924 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7925 7926 bool isAllExplicitSpecializations = true; 7927 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7928 if (TempParamLists.get()[I]->size()) { 7929 isAllExplicitSpecializations = false; 7930 break; 7931 } 7932 } 7933 7934 // FIXME: don't ignore attributes. 7935 7936 // If it's explicit specializations all the way down, just forget 7937 // about the template header and build an appropriate non-templated 7938 // friend. TODO: for source fidelity, remember the headers. 7939 if (isAllExplicitSpecializations) { 7940 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7941 ElaboratedTypeKeyword Keyword 7942 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7943 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7944 *Name, NameLoc); 7945 if (T.isNull()) 7946 return 0; 7947 7948 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7949 if (isa<DependentNameType>(T)) { 7950 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7951 TL.setKeywordLoc(TagLoc); 7952 TL.setQualifierLoc(QualifierLoc); 7953 TL.setNameLoc(NameLoc); 7954 } else { 7955 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7956 TL.setKeywordLoc(TagLoc); 7957 TL.setQualifierLoc(QualifierLoc); 7958 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7959 } 7960 7961 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7962 TSI, FriendLoc); 7963 Friend->setAccess(AS_public); 7964 CurContext->addDecl(Friend); 7965 return Friend; 7966 } 7967 7968 // Handle the case of a templated-scope friend class. e.g. 7969 // template <class T> class A<T>::B; 7970 // FIXME: we don't support these right now. 7971 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7972 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7973 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7974 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7975 TL.setKeywordLoc(TagLoc); 7976 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7977 TL.setNameLoc(NameLoc); 7978 7979 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7980 TSI, FriendLoc); 7981 Friend->setAccess(AS_public); 7982 Friend->setUnsupportedFriend(true); 7983 CurContext->addDecl(Friend); 7984 return Friend; 7985} 7986 7987 7988/// Handle a friend type declaration. This works in tandem with 7989/// ActOnTag. 7990/// 7991/// Notes on friend class templates: 7992/// 7993/// We generally treat friend class declarations as if they were 7994/// declaring a class. So, for example, the elaborated type specifier 7995/// in a friend declaration is required to obey the restrictions of a 7996/// class-head (i.e. no typedefs in the scope chain), template 7997/// parameters are required to match up with simple template-ids, &c. 7998/// However, unlike when declaring a template specialization, it's 7999/// okay to refer to a template specialization without an empty 8000/// template parameter declaration, e.g. 8001/// friend class A<T>::B<unsigned>; 8002/// We permit this as a special case; if there are any template 8003/// parameters present at all, require proper matching, i.e. 8004/// template <> template <class T> friend class A<int>::B; 8005Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8006 MultiTemplateParamsArg TempParams) { 8007 SourceLocation Loc = DS.getSourceRange().getBegin(); 8008 8009 assert(DS.isFriendSpecified()); 8010 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8011 8012 // Try to convert the decl specifier to a type. This works for 8013 // friend templates because ActOnTag never produces a ClassTemplateDecl 8014 // for a TUK_Friend. 8015 Declarator TheDeclarator(DS, Declarator::MemberContext); 8016 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8017 QualType T = TSI->getType(); 8018 if (TheDeclarator.isInvalidType()) 8019 return 0; 8020 8021 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8022 return 0; 8023 8024 // This is definitely an error in C++98. It's probably meant to 8025 // be forbidden in C++0x, too, but the specification is just 8026 // poorly written. 8027 // 8028 // The problem is with declarations like the following: 8029 // template <T> friend A<T>::foo; 8030 // where deciding whether a class C is a friend or not now hinges 8031 // on whether there exists an instantiation of A that causes 8032 // 'foo' to equal C. There are restrictions on class-heads 8033 // (which we declare (by fiat) elaborated friend declarations to 8034 // be) that makes this tractable. 8035 // 8036 // FIXME: handle "template <> friend class A<T>;", which 8037 // is possibly well-formed? Who even knows? 8038 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8039 Diag(Loc, diag::err_tagless_friend_type_template) 8040 << DS.getSourceRange(); 8041 return 0; 8042 } 8043 8044 // C++98 [class.friend]p1: A friend of a class is a function 8045 // or class that is not a member of the class . . . 8046 // This is fixed in DR77, which just barely didn't make the C++03 8047 // deadline. It's also a very silly restriction that seriously 8048 // affects inner classes and which nobody else seems to implement; 8049 // thus we never diagnose it, not even in -pedantic. 8050 // 8051 // But note that we could warn about it: it's always useless to 8052 // friend one of your own members (it's not, however, worthless to 8053 // friend a member of an arbitrary specialization of your template). 8054 8055 Decl *D; 8056 if (unsigned NumTempParamLists = TempParams.size()) 8057 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8058 NumTempParamLists, 8059 TempParams.release(), 8060 TSI, 8061 DS.getFriendSpecLoc()); 8062 else 8063 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8064 8065 if (!D) 8066 return 0; 8067 8068 D->setAccess(AS_public); 8069 CurContext->addDecl(D); 8070 8071 return D; 8072} 8073 8074Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8075 MultiTemplateParamsArg TemplateParams) { 8076 const DeclSpec &DS = D.getDeclSpec(); 8077 8078 assert(DS.isFriendSpecified()); 8079 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8080 8081 SourceLocation Loc = D.getIdentifierLoc(); 8082 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8083 QualType T = TInfo->getType(); 8084 8085 // C++ [class.friend]p1 8086 // A friend of a class is a function or class.... 8087 // Note that this sees through typedefs, which is intended. 8088 // It *doesn't* see through dependent types, which is correct 8089 // according to [temp.arg.type]p3: 8090 // If a declaration acquires a function type through a 8091 // type dependent on a template-parameter and this causes 8092 // a declaration that does not use the syntactic form of a 8093 // function declarator to have a function type, the program 8094 // is ill-formed. 8095 if (!T->isFunctionType()) { 8096 Diag(Loc, diag::err_unexpected_friend); 8097 8098 // It might be worthwhile to try to recover by creating an 8099 // appropriate declaration. 8100 return 0; 8101 } 8102 8103 // C++ [namespace.memdef]p3 8104 // - If a friend declaration in a non-local class first declares a 8105 // class or function, the friend class or function is a member 8106 // of the innermost enclosing namespace. 8107 // - The name of the friend is not found by simple name lookup 8108 // until a matching declaration is provided in that namespace 8109 // scope (either before or after the class declaration granting 8110 // friendship). 8111 // - If a friend function is called, its name may be found by the 8112 // name lookup that considers functions from namespaces and 8113 // classes associated with the types of the function arguments. 8114 // - When looking for a prior declaration of a class or a function 8115 // declared as a friend, scopes outside the innermost enclosing 8116 // namespace scope are not considered. 8117 8118 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8119 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8120 DeclarationName Name = NameInfo.getName(); 8121 assert(Name); 8122 8123 // Check for unexpanded parameter packs. 8124 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8125 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8126 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8127 return 0; 8128 8129 // The context we found the declaration in, or in which we should 8130 // create the declaration. 8131 DeclContext *DC; 8132 Scope *DCScope = S; 8133 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8134 ForRedeclaration); 8135 8136 // FIXME: there are different rules in local classes 8137 8138 // There are four cases here. 8139 // - There's no scope specifier, in which case we just go to the 8140 // appropriate scope and look for a function or function template 8141 // there as appropriate. 8142 // Recover from invalid scope qualifiers as if they just weren't there. 8143 if (SS.isInvalid() || !SS.isSet()) { 8144 // C++0x [namespace.memdef]p3: 8145 // If the name in a friend declaration is neither qualified nor 8146 // a template-id and the declaration is a function or an 8147 // elaborated-type-specifier, the lookup to determine whether 8148 // the entity has been previously declared shall not consider 8149 // any scopes outside the innermost enclosing namespace. 8150 // C++0x [class.friend]p11: 8151 // If a friend declaration appears in a local class and the name 8152 // specified is an unqualified name, a prior declaration is 8153 // looked up without considering scopes that are outside the 8154 // innermost enclosing non-class scope. For a friend function 8155 // declaration, if there is no prior declaration, the program is 8156 // ill-formed. 8157 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8158 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8159 8160 // Find the appropriate context according to the above. 8161 DC = CurContext; 8162 while (true) { 8163 // Skip class contexts. If someone can cite chapter and verse 8164 // for this behavior, that would be nice --- it's what GCC and 8165 // EDG do, and it seems like a reasonable intent, but the spec 8166 // really only says that checks for unqualified existing 8167 // declarations should stop at the nearest enclosing namespace, 8168 // not that they should only consider the nearest enclosing 8169 // namespace. 8170 while (DC->isRecord()) 8171 DC = DC->getParent(); 8172 8173 LookupQualifiedName(Previous, DC); 8174 8175 // TODO: decide what we think about using declarations. 8176 if (isLocal || !Previous.empty()) 8177 break; 8178 8179 if (isTemplateId) { 8180 if (isa<TranslationUnitDecl>(DC)) break; 8181 } else { 8182 if (DC->isFileContext()) break; 8183 } 8184 DC = DC->getParent(); 8185 } 8186 8187 // C++ [class.friend]p1: A friend of a class is a function or 8188 // class that is not a member of the class . . . 8189 // C++0x changes this for both friend types and functions. 8190 // Most C++ 98 compilers do seem to give an error here, so 8191 // we do, too. 8192 if (!Previous.empty() && DC->Equals(CurContext) 8193 && !getLangOptions().CPlusPlus0x) 8194 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8195 8196 DCScope = getScopeForDeclContext(S, DC); 8197 8198 // - There's a non-dependent scope specifier, in which case we 8199 // compute it and do a previous lookup there for a function 8200 // or function template. 8201 } else if (!SS.getScopeRep()->isDependent()) { 8202 DC = computeDeclContext(SS); 8203 if (!DC) return 0; 8204 8205 if (RequireCompleteDeclContext(SS, DC)) return 0; 8206 8207 LookupQualifiedName(Previous, DC); 8208 8209 // Ignore things found implicitly in the wrong scope. 8210 // TODO: better diagnostics for this case. Suggesting the right 8211 // qualified scope would be nice... 8212 LookupResult::Filter F = Previous.makeFilter(); 8213 while (F.hasNext()) { 8214 NamedDecl *D = F.next(); 8215 if (!DC->InEnclosingNamespaceSetOf( 8216 D->getDeclContext()->getRedeclContext())) 8217 F.erase(); 8218 } 8219 F.done(); 8220 8221 if (Previous.empty()) { 8222 D.setInvalidType(); 8223 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8224 return 0; 8225 } 8226 8227 // C++ [class.friend]p1: A friend of a class is a function or 8228 // class that is not a member of the class . . . 8229 if (DC->Equals(CurContext)) 8230 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8231 8232 // - There's a scope specifier that does not match any template 8233 // parameter lists, in which case we use some arbitrary context, 8234 // create a method or method template, and wait for instantiation. 8235 // - There's a scope specifier that does match some template 8236 // parameter lists, which we don't handle right now. 8237 } else { 8238 DC = CurContext; 8239 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8240 } 8241 8242 if (!DC->isRecord()) { 8243 // This implies that it has to be an operator or function. 8244 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8245 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8246 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8247 Diag(Loc, diag::err_introducing_special_friend) << 8248 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8249 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8250 return 0; 8251 } 8252 } 8253 8254 bool Redeclaration = false; 8255 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8256 move(TemplateParams), 8257 IsDefinition, 8258 Redeclaration); 8259 if (!ND) return 0; 8260 8261 assert(ND->getDeclContext() == DC); 8262 assert(ND->getLexicalDeclContext() == CurContext); 8263 8264 // Add the function declaration to the appropriate lookup tables, 8265 // adjusting the redeclarations list as necessary. We don't 8266 // want to do this yet if the friending class is dependent. 8267 // 8268 // Also update the scope-based lookup if the target context's 8269 // lookup context is in lexical scope. 8270 if (!CurContext->isDependentContext()) { 8271 DC = DC->getRedeclContext(); 8272 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8273 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8274 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8275 } 8276 8277 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8278 D.getIdentifierLoc(), ND, 8279 DS.getFriendSpecLoc()); 8280 FrD->setAccess(AS_public); 8281 CurContext->addDecl(FrD); 8282 8283 if (ND->isInvalidDecl()) 8284 FrD->setInvalidDecl(); 8285 else { 8286 FunctionDecl *FD; 8287 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8288 FD = FTD->getTemplatedDecl(); 8289 else 8290 FD = cast<FunctionDecl>(ND); 8291 8292 // Mark templated-scope function declarations as unsupported. 8293 if (FD->getNumTemplateParameterLists()) 8294 FrD->setUnsupportedFriend(true); 8295 } 8296 8297 return ND; 8298} 8299 8300void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8301 AdjustDeclIfTemplate(Dcl); 8302 8303 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8304 if (!Fn) { 8305 Diag(DelLoc, diag::err_deleted_non_function); 8306 return; 8307 } 8308 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8309 Diag(DelLoc, diag::err_deleted_decl_not_first); 8310 Diag(Prev->getLocation(), diag::note_previous_declaration); 8311 // If the declaration wasn't the first, we delete the function anyway for 8312 // recovery. 8313 } 8314 Fn->setDeletedAsWritten(); 8315} 8316 8317void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8318 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8319 8320 if (MD) { 8321 CXXSpecialMember Member = getSpecialMember(MD); 8322 if (Member == CXXInvalid) { 8323 Diag(DefaultLoc, diag::err_default_special_members); 8324 return; 8325 } 8326 8327 MD->setDefaulted(); 8328 MD->setExplicitlyDefaulted(); 8329 8330 // We'll check it when the record is done 8331 if (MD == MD->getCanonicalDecl()) 8332 return; 8333 8334 switch (Member) { 8335 case CXXDefaultConstructor: { 8336 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8337 CheckExplicitlyDefaultedDefaultConstructor(CD); 8338 if (!CD->isInvalidDecl()) 8339 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8340 break; 8341 } 8342 8343 case CXXCopyConstructor: { 8344 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8345 CheckExplicitlyDefaultedCopyConstructor(CD); 8346 if (!CD->isInvalidDecl()) 8347 DefineImplicitCopyConstructor(DefaultLoc, CD); 8348 break; 8349 } 8350 8351 case CXXDestructor: { 8352 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8353 CheckExplicitlyDefaultedDestructor(DD); 8354 if (!DD->isInvalidDecl()) 8355 DefineImplicitDestructor(DefaultLoc, DD); 8356 break; 8357 } 8358 8359 default: 8360 // FIXME: Do the rest once we have functions 8361 break; 8362 } 8363 } else { 8364 Diag(DefaultLoc, diag::err_default_special_members); 8365 } 8366} 8367 8368static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8369 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8370 Stmt *SubStmt = *CI; 8371 if (!SubStmt) 8372 continue; 8373 if (isa<ReturnStmt>(SubStmt)) 8374 Self.Diag(SubStmt->getSourceRange().getBegin(), 8375 diag::err_return_in_constructor_handler); 8376 if (!isa<Expr>(SubStmt)) 8377 SearchForReturnInStmt(Self, SubStmt); 8378 } 8379} 8380 8381void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8382 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8383 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8384 SearchForReturnInStmt(*this, Handler); 8385 } 8386} 8387 8388bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8389 const CXXMethodDecl *Old) { 8390 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8391 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8392 8393 if (Context.hasSameType(NewTy, OldTy) || 8394 NewTy->isDependentType() || OldTy->isDependentType()) 8395 return false; 8396 8397 // Check if the return types are covariant 8398 QualType NewClassTy, OldClassTy; 8399 8400 /// Both types must be pointers or references to classes. 8401 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8402 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8403 NewClassTy = NewPT->getPointeeType(); 8404 OldClassTy = OldPT->getPointeeType(); 8405 } 8406 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8407 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8408 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8409 NewClassTy = NewRT->getPointeeType(); 8410 OldClassTy = OldRT->getPointeeType(); 8411 } 8412 } 8413 } 8414 8415 // The return types aren't either both pointers or references to a class type. 8416 if (NewClassTy.isNull()) { 8417 Diag(New->getLocation(), 8418 diag::err_different_return_type_for_overriding_virtual_function) 8419 << New->getDeclName() << NewTy << OldTy; 8420 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8421 8422 return true; 8423 } 8424 8425 // C++ [class.virtual]p6: 8426 // If the return type of D::f differs from the return type of B::f, the 8427 // class type in the return type of D::f shall be complete at the point of 8428 // declaration of D::f or shall be the class type D. 8429 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8430 if (!RT->isBeingDefined() && 8431 RequireCompleteType(New->getLocation(), NewClassTy, 8432 PDiag(diag::err_covariant_return_incomplete) 8433 << New->getDeclName())) 8434 return true; 8435 } 8436 8437 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8438 // Check if the new class derives from the old class. 8439 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8440 Diag(New->getLocation(), 8441 diag::err_covariant_return_not_derived) 8442 << New->getDeclName() << NewTy << OldTy; 8443 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8444 return true; 8445 } 8446 8447 // Check if we the conversion from derived to base is valid. 8448 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8449 diag::err_covariant_return_inaccessible_base, 8450 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8451 // FIXME: Should this point to the return type? 8452 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8453 // FIXME: this note won't trigger for delayed access control 8454 // diagnostics, and it's impossible to get an undelayed error 8455 // here from access control during the original parse because 8456 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8457 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8458 return true; 8459 } 8460 } 8461 8462 // The qualifiers of the return types must be the same. 8463 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8464 Diag(New->getLocation(), 8465 diag::err_covariant_return_type_different_qualifications) 8466 << New->getDeclName() << NewTy << OldTy; 8467 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8468 return true; 8469 }; 8470 8471 8472 // The new class type must have the same or less qualifiers as the old type. 8473 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8474 Diag(New->getLocation(), 8475 diag::err_covariant_return_type_class_type_more_qualified) 8476 << New->getDeclName() << NewTy << OldTy; 8477 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8478 return true; 8479 }; 8480 8481 return false; 8482} 8483 8484/// \brief Mark the given method pure. 8485/// 8486/// \param Method the method to be marked pure. 8487/// 8488/// \param InitRange the source range that covers the "0" initializer. 8489bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8490 SourceLocation EndLoc = InitRange.getEnd(); 8491 if (EndLoc.isValid()) 8492 Method->setRangeEnd(EndLoc); 8493 8494 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8495 Method->setPure(); 8496 return false; 8497 } 8498 8499 if (!Method->isInvalidDecl()) 8500 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8501 << Method->getDeclName() << InitRange; 8502 return true; 8503} 8504 8505/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8506/// an initializer for the out-of-line declaration 'Dcl'. The scope 8507/// is a fresh scope pushed for just this purpose. 8508/// 8509/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8510/// static data member of class X, names should be looked up in the scope of 8511/// class X. 8512void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8513 // If there is no declaration, there was an error parsing it. 8514 if (D == 0 || D->isInvalidDecl()) return; 8515 8516 // We should only get called for declarations with scope specifiers, like: 8517 // int foo::bar; 8518 assert(D->isOutOfLine()); 8519 EnterDeclaratorContext(S, D->getDeclContext()); 8520} 8521 8522/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8523/// initializer for the out-of-line declaration 'D'. 8524void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8525 // If there is no declaration, there was an error parsing it. 8526 if (D == 0 || D->isInvalidDecl()) return; 8527 8528 assert(D->isOutOfLine()); 8529 ExitDeclaratorContext(S); 8530} 8531 8532/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8533/// C++ if/switch/while/for statement. 8534/// e.g: "if (int x = f()) {...}" 8535DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8536 // C++ 6.4p2: 8537 // The declarator shall not specify a function or an array. 8538 // The type-specifier-seq shall not contain typedef and shall not declare a 8539 // new class or enumeration. 8540 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8541 "Parser allowed 'typedef' as storage class of condition decl."); 8542 8543 TagDecl *OwnedTag = 0; 8544 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8545 QualType Ty = TInfo->getType(); 8546 8547 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8548 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8549 // would be created and CXXConditionDeclExpr wants a VarDecl. 8550 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8551 << D.getSourceRange(); 8552 return DeclResult(); 8553 } else if (OwnedTag && OwnedTag->isDefinition()) { 8554 // The type-specifier-seq shall not declare a new class or enumeration. 8555 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8556 } 8557 8558 Decl *Dcl = ActOnDeclarator(S, D); 8559 if (!Dcl) 8560 return DeclResult(); 8561 8562 return Dcl; 8563} 8564 8565void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8566 bool DefinitionRequired) { 8567 // Ignore any vtable uses in unevaluated operands or for classes that do 8568 // not have a vtable. 8569 if (!Class->isDynamicClass() || Class->isDependentContext() || 8570 CurContext->isDependentContext() || 8571 ExprEvalContexts.back().Context == Unevaluated) 8572 return; 8573 8574 // Try to insert this class into the map. 8575 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8576 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8577 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8578 if (!Pos.second) { 8579 // If we already had an entry, check to see if we are promoting this vtable 8580 // to required a definition. If so, we need to reappend to the VTableUses 8581 // list, since we may have already processed the first entry. 8582 if (DefinitionRequired && !Pos.first->second) { 8583 Pos.first->second = true; 8584 } else { 8585 // Otherwise, we can early exit. 8586 return; 8587 } 8588 } 8589 8590 // Local classes need to have their virtual members marked 8591 // immediately. For all other classes, we mark their virtual members 8592 // at the end of the translation unit. 8593 if (Class->isLocalClass()) 8594 MarkVirtualMembersReferenced(Loc, Class); 8595 else 8596 VTableUses.push_back(std::make_pair(Class, Loc)); 8597} 8598 8599bool Sema::DefineUsedVTables() { 8600 if (VTableUses.empty()) 8601 return false; 8602 8603 // Note: The VTableUses vector could grow as a result of marking 8604 // the members of a class as "used", so we check the size each 8605 // time through the loop and prefer indices (with are stable) to 8606 // iterators (which are not). 8607 bool DefinedAnything = false; 8608 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8609 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8610 if (!Class) 8611 continue; 8612 8613 SourceLocation Loc = VTableUses[I].second; 8614 8615 // If this class has a key function, but that key function is 8616 // defined in another translation unit, we don't need to emit the 8617 // vtable even though we're using it. 8618 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8619 if (KeyFunction && !KeyFunction->hasBody()) { 8620 switch (KeyFunction->getTemplateSpecializationKind()) { 8621 case TSK_Undeclared: 8622 case TSK_ExplicitSpecialization: 8623 case TSK_ExplicitInstantiationDeclaration: 8624 // The key function is in another translation unit. 8625 continue; 8626 8627 case TSK_ExplicitInstantiationDefinition: 8628 case TSK_ImplicitInstantiation: 8629 // We will be instantiating the key function. 8630 break; 8631 } 8632 } else if (!KeyFunction) { 8633 // If we have a class with no key function that is the subject 8634 // of an explicit instantiation declaration, suppress the 8635 // vtable; it will live with the explicit instantiation 8636 // definition. 8637 bool IsExplicitInstantiationDeclaration 8638 = Class->getTemplateSpecializationKind() 8639 == TSK_ExplicitInstantiationDeclaration; 8640 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8641 REnd = Class->redecls_end(); 8642 R != REnd; ++R) { 8643 TemplateSpecializationKind TSK 8644 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8645 if (TSK == TSK_ExplicitInstantiationDeclaration) 8646 IsExplicitInstantiationDeclaration = true; 8647 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8648 IsExplicitInstantiationDeclaration = false; 8649 break; 8650 } 8651 } 8652 8653 if (IsExplicitInstantiationDeclaration) 8654 continue; 8655 } 8656 8657 // Mark all of the virtual members of this class as referenced, so 8658 // that we can build a vtable. Then, tell the AST consumer that a 8659 // vtable for this class is required. 8660 DefinedAnything = true; 8661 MarkVirtualMembersReferenced(Loc, Class); 8662 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8663 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8664 8665 // Optionally warn if we're emitting a weak vtable. 8666 if (Class->getLinkage() == ExternalLinkage && 8667 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 8668 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 8669 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 8670 } 8671 } 8672 VTableUses.clear(); 8673 8674 return DefinedAnything; 8675} 8676 8677void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 8678 const CXXRecordDecl *RD) { 8679 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 8680 e = RD->method_end(); i != e; ++i) { 8681 CXXMethodDecl *MD = *i; 8682 8683 // C++ [basic.def.odr]p2: 8684 // [...] A virtual member function is used if it is not pure. [...] 8685 if (MD->isVirtual() && !MD->isPure()) 8686 MarkDeclarationReferenced(Loc, MD); 8687 } 8688 8689 // Only classes that have virtual bases need a VTT. 8690 if (RD->getNumVBases() == 0) 8691 return; 8692 8693 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 8694 e = RD->bases_end(); i != e; ++i) { 8695 const CXXRecordDecl *Base = 8696 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 8697 if (Base->getNumVBases() == 0) 8698 continue; 8699 MarkVirtualMembersReferenced(Loc, Base); 8700 } 8701} 8702 8703/// SetIvarInitializers - This routine builds initialization ASTs for the 8704/// Objective-C implementation whose ivars need be initialized. 8705void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 8706 if (!getLangOptions().CPlusPlus) 8707 return; 8708 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 8709 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 8710 CollectIvarsToConstructOrDestruct(OID, ivars); 8711 if (ivars.empty()) 8712 return; 8713 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 8714 for (unsigned i = 0; i < ivars.size(); i++) { 8715 FieldDecl *Field = ivars[i]; 8716 if (Field->isInvalidDecl()) 8717 continue; 8718 8719 CXXCtorInitializer *Member; 8720 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 8721 InitializationKind InitKind = 8722 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 8723 8724 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 8725 ExprResult MemberInit = 8726 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 8727 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 8728 // Note, MemberInit could actually come back empty if no initialization 8729 // is required (e.g., because it would call a trivial default constructor) 8730 if (!MemberInit.get() || MemberInit.isInvalid()) 8731 continue; 8732 8733 Member = 8734 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 8735 SourceLocation(), 8736 MemberInit.takeAs<Expr>(), 8737 SourceLocation()); 8738 AllToInit.push_back(Member); 8739 8740 // Be sure that the destructor is accessible and is marked as referenced. 8741 if (const RecordType *RecordTy 8742 = Context.getBaseElementType(Field->getType()) 8743 ->getAs<RecordType>()) { 8744 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 8745 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 8746 MarkDeclarationReferenced(Field->getLocation(), Destructor); 8747 CheckDestructorAccess(Field->getLocation(), Destructor, 8748 PDiag(diag::err_access_dtor_ivar) 8749 << Context.getBaseElementType(Field->getType())); 8750 } 8751 } 8752 } 8753 ObjCImplementation->setIvarInitializers(Context, 8754 AllToInit.data(), AllToInit.size()); 8755 } 8756} 8757 8758static 8759void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 8760 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 8761 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 8762 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 8763 Sema &S) { 8764 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8765 CE = Current.end(); 8766 if (Ctor->isInvalidDecl()) 8767 return; 8768 8769 const FunctionDecl *FNTarget = 0; 8770 CXXConstructorDecl *Target; 8771 8772 // We ignore the result here since if we don't have a body, Target will be 8773 // null below. 8774 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 8775 Target 8776= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 8777 8778 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 8779 // Avoid dereferencing a null pointer here. 8780 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 8781 8782 if (!Current.insert(Canonical)) 8783 return; 8784 8785 // We know that beyond here, we aren't chaining into a cycle. 8786 if (!Target || !Target->isDelegatingConstructor() || 8787 Target->isInvalidDecl() || Valid.count(TCanonical)) { 8788 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8789 Valid.insert(*CI); 8790 Current.clear(); 8791 // We've hit a cycle. 8792 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 8793 Current.count(TCanonical)) { 8794 // If we haven't diagnosed this cycle yet, do so now. 8795 if (!Invalid.count(TCanonical)) { 8796 S.Diag((*Ctor->init_begin())->getSourceLocation(), 8797 diag::warn_delegating_ctor_cycle) 8798 << Ctor; 8799 8800 // Don't add a note for a function delegating directo to itself. 8801 if (TCanonical != Canonical) 8802 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 8803 8804 CXXConstructorDecl *C = Target; 8805 while (C->getCanonicalDecl() != Canonical) { 8806 (void)C->getTargetConstructor()->hasBody(FNTarget); 8807 assert(FNTarget && "Ctor cycle through bodiless function"); 8808 8809 C 8810 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8811 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8812 } 8813 } 8814 8815 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8816 Invalid.insert(*CI); 8817 Current.clear(); 8818 } else { 8819 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8820 } 8821} 8822 8823 8824void Sema::CheckDelegatingCtorCycles() { 8825 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8826 8827 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8828 CE = Current.end(); 8829 8830 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8831 I = DelegatingCtorDecls.begin(), 8832 E = DelegatingCtorDecls.end(); 8833 I != E; ++I) { 8834 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8835 } 8836 8837 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8838 (*CI)->setInvalidDecl(); 8839} 8840