SemaDeclCXX.cpp revision c530d1758cef1acc596f2ec905665da534e66d29
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 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 461 CXXSpecialMember NewSM = getSpecialMember(Ctor), 462 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 463 if (NewSM != OldSM) { 464 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 465 << NewParam->getDefaultArgRange() << NewSM; 466 Diag(Old->getLocation(), diag::note_previous_declaration_special) 467 << OldSM; 468 } 469 } 470 } 471 } 472 473 if (CheckEquivalentExceptionSpec(Old, New)) 474 Invalid = true; 475 476 return Invalid; 477} 478 479/// \brief Merge the exception specifications of two variable declarations. 480/// 481/// This is called when there's a redeclaration of a VarDecl. The function 482/// checks if the redeclaration might have an exception specification and 483/// validates compatibility and merges the specs if necessary. 484void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 485 // Shortcut if exceptions are disabled. 486 if (!getLangOptions().CXXExceptions) 487 return; 488 489 assert(Context.hasSameType(New->getType(), Old->getType()) && 490 "Should only be called if types are otherwise the same."); 491 492 QualType NewType = New->getType(); 493 QualType OldType = Old->getType(); 494 495 // We're only interested in pointers and references to functions, as well 496 // as pointers to member functions. 497 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 498 NewType = R->getPointeeType(); 499 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 500 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 501 NewType = P->getPointeeType(); 502 OldType = OldType->getAs<PointerType>()->getPointeeType(); 503 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 504 NewType = M->getPointeeType(); 505 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 506 } 507 508 if (!NewType->isFunctionProtoType()) 509 return; 510 511 // There's lots of special cases for functions. For function pointers, system 512 // libraries are hopefully not as broken so that we don't need these 513 // workarounds. 514 if (CheckEquivalentExceptionSpec( 515 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 516 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 517 New->setInvalidDecl(); 518 } 519} 520 521/// CheckCXXDefaultArguments - Verify that the default arguments for a 522/// function declaration are well-formed according to C++ 523/// [dcl.fct.default]. 524void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 525 unsigned NumParams = FD->getNumParams(); 526 unsigned p; 527 528 // Find first parameter with a default argument 529 for (p = 0; p < NumParams; ++p) { 530 ParmVarDecl *Param = FD->getParamDecl(p); 531 if (Param->hasDefaultArg()) 532 break; 533 } 534 535 // C++ [dcl.fct.default]p4: 536 // In a given function declaration, all parameters 537 // subsequent to a parameter with a default argument shall 538 // have default arguments supplied in this or previous 539 // declarations. A default argument shall not be redefined 540 // by a later declaration (not even to the same value). 541 unsigned LastMissingDefaultArg = 0; 542 for (; p < NumParams; ++p) { 543 ParmVarDecl *Param = FD->getParamDecl(p); 544 if (!Param->hasDefaultArg()) { 545 if (Param->isInvalidDecl()) 546 /* We already complained about this parameter. */; 547 else if (Param->getIdentifier()) 548 Diag(Param->getLocation(), 549 diag::err_param_default_argument_missing_name) 550 << Param->getIdentifier(); 551 else 552 Diag(Param->getLocation(), 553 diag::err_param_default_argument_missing); 554 555 LastMissingDefaultArg = p; 556 } 557 } 558 559 if (LastMissingDefaultArg > 0) { 560 // Some default arguments were missing. Clear out all of the 561 // default arguments up to (and including) the last missing 562 // default argument, so that we leave the function parameters 563 // in a semantically valid state. 564 for (p = 0; p <= LastMissingDefaultArg; ++p) { 565 ParmVarDecl *Param = FD->getParamDecl(p); 566 if (Param->hasDefaultArg()) { 567 Param->setDefaultArg(0); 568 } 569 } 570 } 571} 572 573/// isCurrentClassName - Determine whether the identifier II is the 574/// name of the class type currently being defined. In the case of 575/// nested classes, this will only return true if II is the name of 576/// the innermost class. 577bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 578 const CXXScopeSpec *SS) { 579 assert(getLangOptions().CPlusPlus && "No class names in C!"); 580 581 CXXRecordDecl *CurDecl; 582 if (SS && SS->isSet() && !SS->isInvalid()) { 583 DeclContext *DC = computeDeclContext(*SS, true); 584 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 585 } else 586 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 587 588 if (CurDecl && CurDecl->getIdentifier()) 589 return &II == CurDecl->getIdentifier(); 590 else 591 return false; 592} 593 594/// \brief Check the validity of a C++ base class specifier. 595/// 596/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 597/// and returns NULL otherwise. 598CXXBaseSpecifier * 599Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 600 SourceRange SpecifierRange, 601 bool Virtual, AccessSpecifier Access, 602 TypeSourceInfo *TInfo, 603 SourceLocation EllipsisLoc) { 604 QualType BaseType = TInfo->getType(); 605 606 // C++ [class.union]p1: 607 // A union shall not have base classes. 608 if (Class->isUnion()) { 609 Diag(Class->getLocation(), diag::err_base_clause_on_union) 610 << SpecifierRange; 611 return 0; 612 } 613 614 if (EllipsisLoc.isValid() && 615 !TInfo->getType()->containsUnexpandedParameterPack()) { 616 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 617 << TInfo->getTypeLoc().getSourceRange(); 618 EllipsisLoc = SourceLocation(); 619 } 620 621 if (BaseType->isDependentType()) 622 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 623 Class->getTagKind() == TTK_Class, 624 Access, TInfo, EllipsisLoc); 625 626 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 627 628 // Base specifiers must be record types. 629 if (!BaseType->isRecordType()) { 630 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 631 return 0; 632 } 633 634 // C++ [class.union]p1: 635 // A union shall not be used as a base class. 636 if (BaseType->isUnionType()) { 637 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 638 return 0; 639 } 640 641 // C++ [class.derived]p2: 642 // The class-name in a base-specifier shall not be an incompletely 643 // defined class. 644 if (RequireCompleteType(BaseLoc, BaseType, 645 PDiag(diag::err_incomplete_base_class) 646 << SpecifierRange)) { 647 Class->setInvalidDecl(); 648 return 0; 649 } 650 651 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 652 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 653 assert(BaseDecl && "Record type has no declaration"); 654 BaseDecl = BaseDecl->getDefinition(); 655 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 656 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 657 assert(CXXBaseDecl && "Base type is not a C++ type"); 658 659 // C++ [class]p3: 660 // If a class is marked final and it appears as a base-type-specifier in 661 // base-clause, the program is ill-formed. 662 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 663 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 664 << CXXBaseDecl->getDeclName(); 665 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 666 << CXXBaseDecl->getDeclName(); 667 return 0; 668 } 669 670 if (BaseDecl->isInvalidDecl()) 671 Class->setInvalidDecl(); 672 673 // Create the base specifier. 674 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 675 Class->getTagKind() == TTK_Class, 676 Access, TInfo, EllipsisLoc); 677} 678 679/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 680/// one entry in the base class list of a class specifier, for 681/// example: 682/// class foo : public bar, virtual private baz { 683/// 'public bar' and 'virtual private baz' are each base-specifiers. 684BaseResult 685Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 686 bool Virtual, AccessSpecifier Access, 687 ParsedType basetype, SourceLocation BaseLoc, 688 SourceLocation EllipsisLoc) { 689 if (!classdecl) 690 return true; 691 692 AdjustDeclIfTemplate(classdecl); 693 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 694 if (!Class) 695 return true; 696 697 TypeSourceInfo *TInfo = 0; 698 GetTypeFromParser(basetype, &TInfo); 699 700 if (EllipsisLoc.isInvalid() && 701 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 702 UPPC_BaseType)) 703 return true; 704 705 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 706 Virtual, Access, TInfo, 707 EllipsisLoc)) 708 return BaseSpec; 709 710 return true; 711} 712 713/// \brief Performs the actual work of attaching the given base class 714/// specifiers to a C++ class. 715bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 716 unsigned NumBases) { 717 if (NumBases == 0) 718 return false; 719 720 // Used to keep track of which base types we have already seen, so 721 // that we can properly diagnose redundant direct base types. Note 722 // that the key is always the unqualified canonical type of the base 723 // class. 724 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 725 726 // Copy non-redundant base specifiers into permanent storage. 727 unsigned NumGoodBases = 0; 728 bool Invalid = false; 729 for (unsigned idx = 0; idx < NumBases; ++idx) { 730 QualType NewBaseType 731 = Context.getCanonicalType(Bases[idx]->getType()); 732 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 733 if (!Class->hasObjectMember()) { 734 if (const RecordType *FDTTy = 735 NewBaseType.getTypePtr()->getAs<RecordType>()) 736 if (FDTTy->getDecl()->hasObjectMember()) 737 Class->setHasObjectMember(true); 738 } 739 740 if (KnownBaseTypes[NewBaseType]) { 741 // C++ [class.mi]p3: 742 // A class shall not be specified as a direct base class of a 743 // derived class more than once. 744 Diag(Bases[idx]->getSourceRange().getBegin(), 745 diag::err_duplicate_base_class) 746 << KnownBaseTypes[NewBaseType]->getType() 747 << Bases[idx]->getSourceRange(); 748 749 // Delete the duplicate base class specifier; we're going to 750 // overwrite its pointer later. 751 Context.Deallocate(Bases[idx]); 752 753 Invalid = true; 754 } else { 755 // Okay, add this new base class. 756 KnownBaseTypes[NewBaseType] = Bases[idx]; 757 Bases[NumGoodBases++] = Bases[idx]; 758 } 759 } 760 761 // Attach the remaining base class specifiers to the derived class. 762 Class->setBases(Bases, NumGoodBases); 763 764 // Delete the remaining (good) base class specifiers, since their 765 // data has been copied into the CXXRecordDecl. 766 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 767 Context.Deallocate(Bases[idx]); 768 769 return Invalid; 770} 771 772/// ActOnBaseSpecifiers - Attach the given base specifiers to the 773/// class, after checking whether there are any duplicate base 774/// classes. 775void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 776 unsigned NumBases) { 777 if (!ClassDecl || !Bases || !NumBases) 778 return; 779 780 AdjustDeclIfTemplate(ClassDecl); 781 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 782 (CXXBaseSpecifier**)(Bases), NumBases); 783} 784 785static CXXRecordDecl *GetClassForType(QualType T) { 786 if (const RecordType *RT = T->getAs<RecordType>()) 787 return cast<CXXRecordDecl>(RT->getDecl()); 788 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 789 return ICT->getDecl(); 790 else 791 return 0; 792} 793 794/// \brief Determine whether the type \p Derived is a C++ class that is 795/// derived from the type \p Base. 796bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 797 if (!getLangOptions().CPlusPlus) 798 return false; 799 800 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 801 if (!DerivedRD) 802 return false; 803 804 CXXRecordDecl *BaseRD = GetClassForType(Base); 805 if (!BaseRD) 806 return false; 807 808 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 809 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 810} 811 812/// \brief Determine whether the type \p Derived is a C++ class that is 813/// derived from the type \p Base. 814bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 815 if (!getLangOptions().CPlusPlus) 816 return false; 817 818 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 819 if (!DerivedRD) 820 return false; 821 822 CXXRecordDecl *BaseRD = GetClassForType(Base); 823 if (!BaseRD) 824 return false; 825 826 return DerivedRD->isDerivedFrom(BaseRD, Paths); 827} 828 829void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 830 CXXCastPath &BasePathArray) { 831 assert(BasePathArray.empty() && "Base path array must be empty!"); 832 assert(Paths.isRecordingPaths() && "Must record paths!"); 833 834 const CXXBasePath &Path = Paths.front(); 835 836 // We first go backward and check if we have a virtual base. 837 // FIXME: It would be better if CXXBasePath had the base specifier for 838 // the nearest virtual base. 839 unsigned Start = 0; 840 for (unsigned I = Path.size(); I != 0; --I) { 841 if (Path[I - 1].Base->isVirtual()) { 842 Start = I - 1; 843 break; 844 } 845 } 846 847 // Now add all bases. 848 for (unsigned I = Start, E = Path.size(); I != E; ++I) 849 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 850} 851 852/// \brief Determine whether the given base path includes a virtual 853/// base class. 854bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 855 for (CXXCastPath::const_iterator B = BasePath.begin(), 856 BEnd = BasePath.end(); 857 B != BEnd; ++B) 858 if ((*B)->isVirtual()) 859 return true; 860 861 return false; 862} 863 864/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 865/// conversion (where Derived and Base are class types) is 866/// well-formed, meaning that the conversion is unambiguous (and 867/// that all of the base classes are accessible). Returns true 868/// and emits a diagnostic if the code is ill-formed, returns false 869/// otherwise. Loc is the location where this routine should point to 870/// if there is an error, and Range is the source range to highlight 871/// if there is an error. 872bool 873Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 874 unsigned InaccessibleBaseID, 875 unsigned AmbigiousBaseConvID, 876 SourceLocation Loc, SourceRange Range, 877 DeclarationName Name, 878 CXXCastPath *BasePath) { 879 // First, determine whether the path from Derived to Base is 880 // ambiguous. This is slightly more expensive than checking whether 881 // the Derived to Base conversion exists, because here we need to 882 // explore multiple paths to determine if there is an ambiguity. 883 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 884 /*DetectVirtual=*/false); 885 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 886 assert(DerivationOkay && 887 "Can only be used with a derived-to-base conversion"); 888 (void)DerivationOkay; 889 890 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 891 if (InaccessibleBaseID) { 892 // Check that the base class can be accessed. 893 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 894 InaccessibleBaseID)) { 895 case AR_inaccessible: 896 return true; 897 case AR_accessible: 898 case AR_dependent: 899 case AR_delayed: 900 break; 901 } 902 } 903 904 // Build a base path if necessary. 905 if (BasePath) 906 BuildBasePathArray(Paths, *BasePath); 907 return false; 908 } 909 910 // We know that the derived-to-base conversion is ambiguous, and 911 // we're going to produce a diagnostic. Perform the derived-to-base 912 // search just one more time to compute all of the possible paths so 913 // that we can print them out. This is more expensive than any of 914 // the previous derived-to-base checks we've done, but at this point 915 // performance isn't as much of an issue. 916 Paths.clear(); 917 Paths.setRecordingPaths(true); 918 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 919 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 920 (void)StillOkay; 921 922 // Build up a textual representation of the ambiguous paths, e.g., 923 // D -> B -> A, that will be used to illustrate the ambiguous 924 // conversions in the diagnostic. We only print one of the paths 925 // to each base class subobject. 926 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 927 928 Diag(Loc, AmbigiousBaseConvID) 929 << Derived << Base << PathDisplayStr << Range << Name; 930 return true; 931} 932 933bool 934Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 935 SourceLocation Loc, SourceRange Range, 936 CXXCastPath *BasePath, 937 bool IgnoreAccess) { 938 return CheckDerivedToBaseConversion(Derived, Base, 939 IgnoreAccess ? 0 940 : diag::err_upcast_to_inaccessible_base, 941 diag::err_ambiguous_derived_to_base_conv, 942 Loc, Range, DeclarationName(), 943 BasePath); 944} 945 946 947/// @brief Builds a string representing ambiguous paths from a 948/// specific derived class to different subobjects of the same base 949/// class. 950/// 951/// This function builds a string that can be used in error messages 952/// to show the different paths that one can take through the 953/// inheritance hierarchy to go from the derived class to different 954/// subobjects of a base class. The result looks something like this: 955/// @code 956/// struct D -> struct B -> struct A 957/// struct D -> struct C -> struct A 958/// @endcode 959std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 960 std::string PathDisplayStr; 961 std::set<unsigned> DisplayedPaths; 962 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 963 Path != Paths.end(); ++Path) { 964 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 965 // We haven't displayed a path to this particular base 966 // class subobject yet. 967 PathDisplayStr += "\n "; 968 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 969 for (CXXBasePath::const_iterator Element = Path->begin(); 970 Element != Path->end(); ++Element) 971 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 972 } 973 } 974 975 return PathDisplayStr; 976} 977 978//===----------------------------------------------------------------------===// 979// C++ class member Handling 980//===----------------------------------------------------------------------===// 981 982/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 983Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 984 SourceLocation ASLoc, 985 SourceLocation ColonLoc) { 986 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 987 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 988 ASLoc, ColonLoc); 989 CurContext->addHiddenDecl(ASDecl); 990 return ASDecl; 991} 992 993/// CheckOverrideControl - Check C++0x override control semantics. 994void Sema::CheckOverrideControl(const Decl *D) { 995 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 996 if (!MD || !MD->isVirtual()) 997 return; 998 999 if (MD->isDependentContext()) 1000 return; 1001 1002 // C++0x [class.virtual]p3: 1003 // If a virtual function is marked with the virt-specifier override and does 1004 // not override a member function of a base class, 1005 // the program is ill-formed. 1006 bool HasOverriddenMethods = 1007 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1008 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1009 Diag(MD->getLocation(), 1010 diag::err_function_marked_override_not_overriding) 1011 << MD->getDeclName(); 1012 return; 1013 } 1014} 1015 1016/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1017/// function overrides a virtual member function marked 'final', according to 1018/// C++0x [class.virtual]p3. 1019bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1020 const CXXMethodDecl *Old) { 1021 if (!Old->hasAttr<FinalAttr>()) 1022 return false; 1023 1024 Diag(New->getLocation(), diag::err_final_function_overridden) 1025 << New->getDeclName(); 1026 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1027 return true; 1028} 1029 1030/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1031/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1032/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1033/// any. 1034Decl * 1035Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1036 MultiTemplateParamsArg TemplateParameterLists, 1037 ExprTy *BW, const VirtSpecifiers &VS, 1038 ExprTy *InitExpr, bool IsDefinition) { 1039 const DeclSpec &DS = D.getDeclSpec(); 1040 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1041 DeclarationName Name = NameInfo.getName(); 1042 SourceLocation Loc = NameInfo.getLoc(); 1043 1044 // For anonymous bitfields, the location should point to the type. 1045 if (Loc.isInvalid()) 1046 Loc = D.getSourceRange().getBegin(); 1047 1048 Expr *BitWidth = static_cast<Expr*>(BW); 1049 Expr *Init = static_cast<Expr*>(InitExpr); 1050 1051 assert(isa<CXXRecordDecl>(CurContext)); 1052 assert(!DS.isFriendSpecified()); 1053 1054 bool isFunc = false; 1055 if (D.isFunctionDeclarator()) 1056 isFunc = true; 1057 else if (D.getNumTypeObjects() == 0 && 1058 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1059 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1060 isFunc = TDType->isFunctionType(); 1061 } 1062 1063 // C++ 9.2p6: A member shall not be declared to have automatic storage 1064 // duration (auto, register) or with the extern storage-class-specifier. 1065 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1066 // data members and cannot be applied to names declared const or static, 1067 // and cannot be applied to reference members. 1068 switch (DS.getStorageClassSpec()) { 1069 case DeclSpec::SCS_unspecified: 1070 case DeclSpec::SCS_typedef: 1071 case DeclSpec::SCS_static: 1072 // FALL THROUGH. 1073 break; 1074 case DeclSpec::SCS_mutable: 1075 if (isFunc) { 1076 if (DS.getStorageClassSpecLoc().isValid()) 1077 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1078 else 1079 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1080 1081 // FIXME: It would be nicer if the keyword was ignored only for this 1082 // declarator. Otherwise we could get follow-up errors. 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 break; 1086 default: 1087 if (DS.getStorageClassSpecLoc().isValid()) 1088 Diag(DS.getStorageClassSpecLoc(), 1089 diag::err_storageclass_invalid_for_member); 1090 else 1091 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1092 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1093 } 1094 1095 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1096 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1097 !isFunc); 1098 1099 Decl *Member; 1100 if (isInstField) { 1101 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1102 1103 if (SS.isSet() && !SS.isInvalid()) { 1104 // The user provided a superfluous scope specifier inside a class 1105 // definition: 1106 // 1107 // class X { 1108 // int X::member; 1109 // }; 1110 DeclContext *DC = 0; 1111 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1112 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1113 << Name << FixItHint::CreateRemoval(SS.getRange()); 1114 else 1115 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1116 << Name << SS.getRange(); 1117 1118 SS.clear(); 1119 } 1120 1121 // FIXME: Check for template parameters! 1122 // FIXME: Check that the name is an identifier! 1123 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1124 AS); 1125 assert(Member && "HandleField never returns null"); 1126 } else { 1127 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1128 if (!Member) { 1129 return 0; 1130 } 1131 1132 // Non-instance-fields can't have a bitfield. 1133 if (BitWidth) { 1134 if (Member->isInvalidDecl()) { 1135 // don't emit another diagnostic. 1136 } else if (isa<VarDecl>(Member)) { 1137 // C++ 9.6p3: A bit-field shall not be a static member. 1138 // "static member 'A' cannot be a bit-field" 1139 Diag(Loc, diag::err_static_not_bitfield) 1140 << Name << BitWidth->getSourceRange(); 1141 } else if (isa<TypedefDecl>(Member)) { 1142 // "typedef member 'x' cannot be a bit-field" 1143 Diag(Loc, diag::err_typedef_not_bitfield) 1144 << Name << BitWidth->getSourceRange(); 1145 } else { 1146 // A function typedef ("typedef int f(); f a;"). 1147 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1148 Diag(Loc, diag::err_not_integral_type_bitfield) 1149 << Name << cast<ValueDecl>(Member)->getType() 1150 << BitWidth->getSourceRange(); 1151 } 1152 1153 BitWidth = 0; 1154 Member->setInvalidDecl(); 1155 } 1156 1157 Member->setAccess(AS); 1158 1159 // If we have declared a member function template, set the access of the 1160 // templated declaration as well. 1161 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1162 FunTmpl->getTemplatedDecl()->setAccess(AS); 1163 } 1164 1165 if (VS.isOverrideSpecified()) { 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 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1171 } else 1172 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1173 } 1174 if (VS.isFinalSpecified()) { 1175 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1176 if (!MD || !MD->isVirtual()) { 1177 Diag(Member->getLocStart(), 1178 diag::override_keyword_only_allowed_on_virtual_member_functions) 1179 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1180 } else 1181 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1182 } 1183 1184 if (VS.getLastLocation().isValid()) { 1185 // Update the end location of a method that has a virt-specifiers. 1186 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1187 MD->setRangeEnd(VS.getLastLocation()); 1188 } 1189 1190 CheckOverrideControl(Member); 1191 1192 assert((Name || isInstField) && "No identifier for non-field ?"); 1193 1194 if (Init) 1195 AddInitializerToDecl(Member, Init, false, 1196 DS.getTypeSpecType() == DeclSpec::TST_auto); 1197 1198 FinalizeDeclaration(Member); 1199 1200 if (isInstField) 1201 FieldCollector->Add(cast<FieldDecl>(Member)); 1202 return Member; 1203} 1204 1205/// \brief Find the direct and/or virtual base specifiers that 1206/// correspond to the given base type, for use in base initialization 1207/// within a constructor. 1208static bool FindBaseInitializer(Sema &SemaRef, 1209 CXXRecordDecl *ClassDecl, 1210 QualType BaseType, 1211 const CXXBaseSpecifier *&DirectBaseSpec, 1212 const CXXBaseSpecifier *&VirtualBaseSpec) { 1213 // First, check for a direct base class. 1214 DirectBaseSpec = 0; 1215 for (CXXRecordDecl::base_class_const_iterator Base 1216 = ClassDecl->bases_begin(); 1217 Base != ClassDecl->bases_end(); ++Base) { 1218 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1219 // We found a direct base of this type. That's what we're 1220 // initializing. 1221 DirectBaseSpec = &*Base; 1222 break; 1223 } 1224 } 1225 1226 // Check for a virtual base class. 1227 // FIXME: We might be able to short-circuit this if we know in advance that 1228 // there are no virtual bases. 1229 VirtualBaseSpec = 0; 1230 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1231 // We haven't found a base yet; search the class hierarchy for a 1232 // virtual base class. 1233 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1234 /*DetectVirtual=*/false); 1235 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1236 BaseType, Paths)) { 1237 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1238 Path != Paths.end(); ++Path) { 1239 if (Path->back().Base->isVirtual()) { 1240 VirtualBaseSpec = Path->back().Base; 1241 break; 1242 } 1243 } 1244 } 1245 } 1246 1247 return DirectBaseSpec || VirtualBaseSpec; 1248} 1249 1250/// ActOnMemInitializer - Handle a C++ member initializer. 1251MemInitResult 1252Sema::ActOnMemInitializer(Decl *ConstructorD, 1253 Scope *S, 1254 CXXScopeSpec &SS, 1255 IdentifierInfo *MemberOrBase, 1256 ParsedType TemplateTypeTy, 1257 SourceLocation IdLoc, 1258 SourceLocation LParenLoc, 1259 ExprTy **Args, unsigned NumArgs, 1260 SourceLocation RParenLoc, 1261 SourceLocation EllipsisLoc) { 1262 if (!ConstructorD) 1263 return true; 1264 1265 AdjustDeclIfTemplate(ConstructorD); 1266 1267 CXXConstructorDecl *Constructor 1268 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1269 if (!Constructor) { 1270 // The user wrote a constructor initializer on a function that is 1271 // not a C++ constructor. Ignore the error for now, because we may 1272 // have more member initializers coming; we'll diagnose it just 1273 // once in ActOnMemInitializers. 1274 return true; 1275 } 1276 1277 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1278 1279 // C++ [class.base.init]p2: 1280 // Names in a mem-initializer-id are looked up in the scope of the 1281 // constructor's class and, if not found in that scope, are looked 1282 // up in the scope containing the constructor's definition. 1283 // [Note: if the constructor's class contains a member with the 1284 // same name as a direct or virtual base class of the class, a 1285 // mem-initializer-id naming the member or base class and composed 1286 // of a single identifier refers to the class member. A 1287 // mem-initializer-id for the hidden base class may be specified 1288 // using a qualified name. ] 1289 if (!SS.getScopeRep() && !TemplateTypeTy) { 1290 // Look for a member, first. 1291 FieldDecl *Member = 0; 1292 DeclContext::lookup_result Result 1293 = ClassDecl->lookup(MemberOrBase); 1294 if (Result.first != Result.second) { 1295 Member = dyn_cast<FieldDecl>(*Result.first); 1296 1297 if (Member) { 1298 if (EllipsisLoc.isValid()) 1299 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1300 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1301 1302 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1303 LParenLoc, RParenLoc); 1304 } 1305 1306 // Handle anonymous union case. 1307 if (IndirectFieldDecl* IndirectField 1308 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1309 if (EllipsisLoc.isValid()) 1310 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1311 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1312 1313 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1314 NumArgs, IdLoc, 1315 LParenLoc, RParenLoc); 1316 } 1317 } 1318 } 1319 // It didn't name a member, so see if it names a class. 1320 QualType BaseType; 1321 TypeSourceInfo *TInfo = 0; 1322 1323 if (TemplateTypeTy) { 1324 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1325 } else { 1326 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1327 LookupParsedName(R, S, &SS); 1328 1329 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1330 if (!TyD) { 1331 if (R.isAmbiguous()) return true; 1332 1333 // We don't want access-control diagnostics here. 1334 R.suppressDiagnostics(); 1335 1336 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1337 bool NotUnknownSpecialization = false; 1338 DeclContext *DC = computeDeclContext(SS, false); 1339 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1340 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1341 1342 if (!NotUnknownSpecialization) { 1343 // When the scope specifier can refer to a member of an unknown 1344 // specialization, we take it as a type name. 1345 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1346 SS.getWithLocInContext(Context), 1347 *MemberOrBase, IdLoc); 1348 if (BaseType.isNull()) 1349 return true; 1350 1351 R.clear(); 1352 R.setLookupName(MemberOrBase); 1353 } 1354 } 1355 1356 // If no results were found, try to correct typos. 1357 if (R.empty() && BaseType.isNull() && 1358 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1359 R.isSingleResult()) { 1360 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1361 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1362 // We have found a non-static data member with a similar 1363 // name to what was typed; complain and initialize that 1364 // member. 1365 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1366 << MemberOrBase << true << R.getLookupName() 1367 << FixItHint::CreateReplacement(R.getNameLoc(), 1368 R.getLookupName().getAsString()); 1369 Diag(Member->getLocation(), diag::note_previous_decl) 1370 << Member->getDeclName(); 1371 1372 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1373 LParenLoc, RParenLoc); 1374 } 1375 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1376 const CXXBaseSpecifier *DirectBaseSpec; 1377 const CXXBaseSpecifier *VirtualBaseSpec; 1378 if (FindBaseInitializer(*this, ClassDecl, 1379 Context.getTypeDeclType(Type), 1380 DirectBaseSpec, VirtualBaseSpec)) { 1381 // We have found a direct or virtual base class with a 1382 // similar name to what was typed; complain and initialize 1383 // that base class. 1384 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1385 << MemberOrBase << false << R.getLookupName() 1386 << FixItHint::CreateReplacement(R.getNameLoc(), 1387 R.getLookupName().getAsString()); 1388 1389 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1390 : VirtualBaseSpec; 1391 Diag(BaseSpec->getSourceRange().getBegin(), 1392 diag::note_base_class_specified_here) 1393 << BaseSpec->getType() 1394 << BaseSpec->getSourceRange(); 1395 1396 TyD = Type; 1397 } 1398 } 1399 } 1400 1401 if (!TyD && BaseType.isNull()) { 1402 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1403 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1404 return true; 1405 } 1406 } 1407 1408 if (BaseType.isNull()) { 1409 BaseType = Context.getTypeDeclType(TyD); 1410 if (SS.isSet()) { 1411 NestedNameSpecifier *Qualifier = 1412 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1413 1414 // FIXME: preserve source range information 1415 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1416 } 1417 } 1418 } 1419 1420 if (!TInfo) 1421 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1422 1423 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1424 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1425} 1426 1427/// Checks an initializer expression for use of uninitialized fields, such as 1428/// containing the field that is being initialized. Returns true if there is an 1429/// uninitialized field was used an updates the SourceLocation parameter; false 1430/// otherwise. 1431static bool InitExprContainsUninitializedFields(const Stmt *S, 1432 const ValueDecl *LhsField, 1433 SourceLocation *L) { 1434 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1435 1436 if (isa<CallExpr>(S)) { 1437 // Do not descend into function calls or constructors, as the use 1438 // of an uninitialized field may be valid. One would have to inspect 1439 // the contents of the function/ctor to determine if it is safe or not. 1440 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1441 // may be safe, depending on what the function/ctor does. 1442 return false; 1443 } 1444 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1445 const NamedDecl *RhsField = ME->getMemberDecl(); 1446 1447 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1448 // The member expression points to a static data member. 1449 assert(VD->isStaticDataMember() && 1450 "Member points to non-static data member!"); 1451 (void)VD; 1452 return false; 1453 } 1454 1455 if (isa<EnumConstantDecl>(RhsField)) { 1456 // The member expression points to an enum. 1457 return false; 1458 } 1459 1460 if (RhsField == LhsField) { 1461 // Initializing a field with itself. Throw a warning. 1462 // But wait; there are exceptions! 1463 // Exception #1: The field may not belong to this record. 1464 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1465 const Expr *base = ME->getBase(); 1466 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1467 // Even though the field matches, it does not belong to this record. 1468 return false; 1469 } 1470 // None of the exceptions triggered; return true to indicate an 1471 // uninitialized field was used. 1472 *L = ME->getMemberLoc(); 1473 return true; 1474 } 1475 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1476 // sizeof/alignof doesn't reference contents, do not warn. 1477 return false; 1478 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1479 // address-of doesn't reference contents (the pointer may be dereferenced 1480 // in the same expression but it would be rare; and weird). 1481 if (UOE->getOpcode() == UO_AddrOf) 1482 return false; 1483 } 1484 for (Stmt::const_child_range it = S->children(); it; ++it) { 1485 if (!*it) { 1486 // An expression such as 'member(arg ?: "")' may trigger this. 1487 continue; 1488 } 1489 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1490 return true; 1491 } 1492 return false; 1493} 1494 1495MemInitResult 1496Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1497 unsigned NumArgs, SourceLocation IdLoc, 1498 SourceLocation LParenLoc, 1499 SourceLocation RParenLoc) { 1500 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1501 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1502 assert((DirectMember || IndirectMember) && 1503 "Member must be a FieldDecl or IndirectFieldDecl"); 1504 1505 if (Member->isInvalidDecl()) 1506 return true; 1507 1508 // Diagnose value-uses of fields to initialize themselves, e.g. 1509 // foo(foo) 1510 // where foo is not also a parameter to the constructor. 1511 // TODO: implement -Wuninitialized and fold this into that framework. 1512 for (unsigned i = 0; i < NumArgs; ++i) { 1513 SourceLocation L; 1514 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1515 // FIXME: Return true in the case when other fields are used before being 1516 // uninitialized. For example, let this field be the i'th field. When 1517 // initializing the i'th field, throw a warning if any of the >= i'th 1518 // fields are used, as they are not yet initialized. 1519 // Right now we are only handling the case where the i'th field uses 1520 // itself in its initializer. 1521 Diag(L, diag::warn_field_is_uninit); 1522 } 1523 } 1524 1525 bool HasDependentArg = false; 1526 for (unsigned i = 0; i < NumArgs; i++) 1527 HasDependentArg |= Args[i]->isTypeDependent(); 1528 1529 Expr *Init; 1530 if (Member->getType()->isDependentType() || HasDependentArg) { 1531 // Can't check initialization for a member of dependent type or when 1532 // any of the arguments are type-dependent expressions. 1533 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1534 RParenLoc); 1535 1536 // Erase any temporaries within this evaluation context; we're not 1537 // going to track them in the AST, since we'll be rebuilding the 1538 // ASTs during template instantiation. 1539 ExprTemporaries.erase( 1540 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1541 ExprTemporaries.end()); 1542 } else { 1543 // Initialize the member. 1544 InitializedEntity MemberEntity = 1545 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1546 : InitializedEntity::InitializeMember(IndirectMember, 0); 1547 InitializationKind Kind = 1548 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1549 1550 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1551 1552 ExprResult MemberInit = 1553 InitSeq.Perform(*this, MemberEntity, Kind, 1554 MultiExprArg(*this, Args, NumArgs), 0); 1555 if (MemberInit.isInvalid()) 1556 return true; 1557 1558 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1559 1560 // C++0x [class.base.init]p7: 1561 // The initialization of each base and member constitutes a 1562 // full-expression. 1563 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1564 if (MemberInit.isInvalid()) 1565 return true; 1566 1567 // If we are in a dependent context, template instantiation will 1568 // perform this type-checking again. Just save the arguments that we 1569 // received in a ParenListExpr. 1570 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1571 // of the information that we have about the member 1572 // initializer. However, deconstructing the ASTs is a dicey process, 1573 // and this approach is far more likely to get the corner cases right. 1574 if (CurContext->isDependentContext()) 1575 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1576 RParenLoc); 1577 else 1578 Init = MemberInit.get(); 1579 } 1580 1581 if (DirectMember) { 1582 return new (Context) CXXCtorInitializer(Context, DirectMember, 1583 IdLoc, LParenLoc, Init, 1584 RParenLoc); 1585 } else { 1586 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1587 IdLoc, LParenLoc, Init, 1588 RParenLoc); 1589 } 1590} 1591 1592MemInitResult 1593Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1594 Expr **Args, unsigned NumArgs, 1595 SourceLocation NameLoc, 1596 SourceLocation LParenLoc, 1597 SourceLocation RParenLoc, 1598 CXXRecordDecl *ClassDecl) { 1599 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1600 if (!LangOpts.CPlusPlus0x) 1601 return Diag(Loc, diag::err_delegation_0x_only) 1602 << TInfo->getTypeLoc().getLocalSourceRange(); 1603 1604 // Initialize the object. 1605 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1606 QualType(ClassDecl->getTypeForDecl(), 0)); 1607 InitializationKind Kind = 1608 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1609 1610 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1611 1612 ExprResult DelegationInit = 1613 InitSeq.Perform(*this, DelegationEntity, Kind, 1614 MultiExprArg(*this, Args, NumArgs), 0); 1615 if (DelegationInit.isInvalid()) 1616 return true; 1617 1618 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1619 CXXConstructorDecl *Constructor 1620 = ConExpr->getConstructor(); 1621 assert(Constructor && "Delegating constructor with no target?"); 1622 1623 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1624 1625 // C++0x [class.base.init]p7: 1626 // The initialization of each base and member constitutes a 1627 // full-expression. 1628 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1629 if (DelegationInit.isInvalid()) 1630 return true; 1631 1632 // If we are in a dependent context, template instantiation will 1633 // perform this type-checking again. Just save the arguments that we 1634 // received in a ParenListExpr. 1635 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1636 // of the information that we have about the base 1637 // initializer. However, deconstructing the ASTs is a dicey process, 1638 // and this approach is far more likely to get the corner cases right. 1639 if (CurContext->isDependentContext()) { 1640 ExprResult Init 1641 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1642 NumArgs, RParenLoc)); 1643 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1644 Constructor, Init.takeAs<Expr>(), 1645 RParenLoc); 1646 } 1647 1648 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1649 DelegationInit.takeAs<Expr>(), 1650 RParenLoc); 1651} 1652 1653MemInitResult 1654Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1655 Expr **Args, unsigned NumArgs, 1656 SourceLocation LParenLoc, SourceLocation RParenLoc, 1657 CXXRecordDecl *ClassDecl, 1658 SourceLocation EllipsisLoc) { 1659 bool HasDependentArg = false; 1660 for (unsigned i = 0; i < NumArgs; i++) 1661 HasDependentArg |= Args[i]->isTypeDependent(); 1662 1663 SourceLocation BaseLoc 1664 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1665 1666 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1667 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1668 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1669 1670 // C++ [class.base.init]p2: 1671 // [...] Unless the mem-initializer-id names a nonstatic data 1672 // member of the constructor's class or a direct or virtual base 1673 // of that class, the mem-initializer is ill-formed. A 1674 // mem-initializer-list can initialize a base class using any 1675 // name that denotes that base class type. 1676 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1677 1678 if (EllipsisLoc.isValid()) { 1679 // This is a pack expansion. 1680 if (!BaseType->containsUnexpandedParameterPack()) { 1681 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1682 << SourceRange(BaseLoc, RParenLoc); 1683 1684 EllipsisLoc = SourceLocation(); 1685 } 1686 } else { 1687 // Check for any unexpanded parameter packs. 1688 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1689 return true; 1690 1691 for (unsigned I = 0; I != NumArgs; ++I) 1692 if (DiagnoseUnexpandedParameterPack(Args[I])) 1693 return true; 1694 } 1695 1696 // Check for direct and virtual base classes. 1697 const CXXBaseSpecifier *DirectBaseSpec = 0; 1698 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1699 if (!Dependent) { 1700 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1701 BaseType)) 1702 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1703 LParenLoc, RParenLoc, ClassDecl); 1704 1705 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1706 VirtualBaseSpec); 1707 1708 // C++ [base.class.init]p2: 1709 // Unless the mem-initializer-id names a nonstatic data member of the 1710 // constructor's class or a direct or virtual base of that class, the 1711 // mem-initializer is ill-formed. 1712 if (!DirectBaseSpec && !VirtualBaseSpec) { 1713 // If the class has any dependent bases, then it's possible that 1714 // one of those types will resolve to the same type as 1715 // BaseType. Therefore, just treat this as a dependent base 1716 // class initialization. FIXME: Should we try to check the 1717 // initialization anyway? It seems odd. 1718 if (ClassDecl->hasAnyDependentBases()) 1719 Dependent = true; 1720 else 1721 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1722 << BaseType << Context.getTypeDeclType(ClassDecl) 1723 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1724 } 1725 } 1726 1727 if (Dependent) { 1728 // Can't check initialization for a base of dependent type or when 1729 // any of the arguments are type-dependent expressions. 1730 ExprResult BaseInit 1731 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1732 RParenLoc)); 1733 1734 // Erase any temporaries within this evaluation context; we're not 1735 // going to track them in the AST, since we'll be rebuilding the 1736 // ASTs during template instantiation. 1737 ExprTemporaries.erase( 1738 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1739 ExprTemporaries.end()); 1740 1741 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1742 /*IsVirtual=*/false, 1743 LParenLoc, 1744 BaseInit.takeAs<Expr>(), 1745 RParenLoc, 1746 EllipsisLoc); 1747 } 1748 1749 // C++ [base.class.init]p2: 1750 // If a mem-initializer-id is ambiguous because it designates both 1751 // a direct non-virtual base class and an inherited virtual base 1752 // class, the mem-initializer is ill-formed. 1753 if (DirectBaseSpec && VirtualBaseSpec) 1754 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1755 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1756 1757 CXXBaseSpecifier *BaseSpec 1758 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1759 if (!BaseSpec) 1760 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1761 1762 // Initialize the base. 1763 InitializedEntity BaseEntity = 1764 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1765 InitializationKind Kind = 1766 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1767 1768 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1769 1770 ExprResult BaseInit = 1771 InitSeq.Perform(*this, BaseEntity, Kind, 1772 MultiExprArg(*this, Args, NumArgs), 0); 1773 if (BaseInit.isInvalid()) 1774 return true; 1775 1776 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1777 1778 // C++0x [class.base.init]p7: 1779 // The initialization of each base and member constitutes a 1780 // full-expression. 1781 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1782 if (BaseInit.isInvalid()) 1783 return true; 1784 1785 // If we are in a dependent context, template instantiation will 1786 // perform this type-checking again. Just save the arguments that we 1787 // received in a ParenListExpr. 1788 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1789 // of the information that we have about the base 1790 // initializer. However, deconstructing the ASTs is a dicey process, 1791 // and this approach is far more likely to get the corner cases right. 1792 if (CurContext->isDependentContext()) { 1793 ExprResult Init 1794 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1795 RParenLoc)); 1796 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1797 BaseSpec->isVirtual(), 1798 LParenLoc, 1799 Init.takeAs<Expr>(), 1800 RParenLoc, 1801 EllipsisLoc); 1802 } 1803 1804 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1805 BaseSpec->isVirtual(), 1806 LParenLoc, 1807 BaseInit.takeAs<Expr>(), 1808 RParenLoc, 1809 EllipsisLoc); 1810} 1811 1812/// ImplicitInitializerKind - How an implicit base or member initializer should 1813/// initialize its base or member. 1814enum ImplicitInitializerKind { 1815 IIK_Default, 1816 IIK_Copy, 1817 IIK_Move 1818}; 1819 1820static bool 1821BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1822 ImplicitInitializerKind ImplicitInitKind, 1823 CXXBaseSpecifier *BaseSpec, 1824 bool IsInheritedVirtualBase, 1825 CXXCtorInitializer *&CXXBaseInit) { 1826 InitializedEntity InitEntity 1827 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1828 IsInheritedVirtualBase); 1829 1830 ExprResult BaseInit; 1831 1832 switch (ImplicitInitKind) { 1833 case IIK_Default: { 1834 InitializationKind InitKind 1835 = InitializationKind::CreateDefault(Constructor->getLocation()); 1836 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1837 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1838 MultiExprArg(SemaRef, 0, 0)); 1839 break; 1840 } 1841 1842 case IIK_Copy: { 1843 ParmVarDecl *Param = Constructor->getParamDecl(0); 1844 QualType ParamType = Param->getType().getNonReferenceType(); 1845 1846 Expr *CopyCtorArg = 1847 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1848 Constructor->getLocation(), ParamType, 1849 VK_LValue, 0); 1850 1851 // Cast to the base class to avoid ambiguities. 1852 QualType ArgTy = 1853 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1854 ParamType.getQualifiers()); 1855 1856 CXXCastPath BasePath; 1857 BasePath.push_back(BaseSpec); 1858 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1859 CK_UncheckedDerivedToBase, 1860 VK_LValue, &BasePath).take(); 1861 1862 InitializationKind InitKind 1863 = InitializationKind::CreateDirect(Constructor->getLocation(), 1864 SourceLocation(), SourceLocation()); 1865 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1866 &CopyCtorArg, 1); 1867 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1868 MultiExprArg(&CopyCtorArg, 1)); 1869 break; 1870 } 1871 1872 case IIK_Move: 1873 assert(false && "Unhandled initializer kind!"); 1874 } 1875 1876 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1877 if (BaseInit.isInvalid()) 1878 return true; 1879 1880 CXXBaseInit = 1881 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1882 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1883 SourceLocation()), 1884 BaseSpec->isVirtual(), 1885 SourceLocation(), 1886 BaseInit.takeAs<Expr>(), 1887 SourceLocation(), 1888 SourceLocation()); 1889 1890 return false; 1891} 1892 1893static bool 1894BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1895 ImplicitInitializerKind ImplicitInitKind, 1896 FieldDecl *Field, 1897 CXXCtorInitializer *&CXXMemberInit) { 1898 if (Field->isInvalidDecl()) 1899 return true; 1900 1901 SourceLocation Loc = Constructor->getLocation(); 1902 1903 if (ImplicitInitKind == IIK_Copy) { 1904 ParmVarDecl *Param = Constructor->getParamDecl(0); 1905 QualType ParamType = Param->getType().getNonReferenceType(); 1906 1907 Expr *MemberExprBase = 1908 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1909 Loc, ParamType, VK_LValue, 0); 1910 1911 // Build a reference to this field within the parameter. 1912 CXXScopeSpec SS; 1913 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1914 Sema::LookupMemberName); 1915 MemberLookup.addDecl(Field, AS_public); 1916 MemberLookup.resolveKind(); 1917 ExprResult CopyCtorArg 1918 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1919 ParamType, Loc, 1920 /*IsArrow=*/false, 1921 SS, 1922 /*FirstQualifierInScope=*/0, 1923 MemberLookup, 1924 /*TemplateArgs=*/0); 1925 if (CopyCtorArg.isInvalid()) 1926 return true; 1927 1928 // When the field we are copying is an array, create index variables for 1929 // each dimension of the array. We use these index variables to subscript 1930 // the source array, and other clients (e.g., CodeGen) will perform the 1931 // necessary iteration with these index variables. 1932 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1933 QualType BaseType = Field->getType(); 1934 QualType SizeType = SemaRef.Context.getSizeType(); 1935 while (const ConstantArrayType *Array 1936 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1937 // Create the iteration variable for this array index. 1938 IdentifierInfo *IterationVarName = 0; 1939 { 1940 llvm::SmallString<8> Str; 1941 llvm::raw_svector_ostream OS(Str); 1942 OS << "__i" << IndexVariables.size(); 1943 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1944 } 1945 VarDecl *IterationVar 1946 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1947 IterationVarName, SizeType, 1948 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1949 SC_None, SC_None); 1950 IndexVariables.push_back(IterationVar); 1951 1952 // Create a reference to the iteration variable. 1953 ExprResult IterationVarRef 1954 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1955 assert(!IterationVarRef.isInvalid() && 1956 "Reference to invented variable cannot fail!"); 1957 1958 // Subscript the array with this iteration variable. 1959 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1960 Loc, 1961 IterationVarRef.take(), 1962 Loc); 1963 if (CopyCtorArg.isInvalid()) 1964 return true; 1965 1966 BaseType = Array->getElementType(); 1967 } 1968 1969 // Construct the entity that we will be initializing. For an array, this 1970 // will be first element in the array, which may require several levels 1971 // of array-subscript entities. 1972 llvm::SmallVector<InitializedEntity, 4> Entities; 1973 Entities.reserve(1 + IndexVariables.size()); 1974 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1975 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1976 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1977 0, 1978 Entities.back())); 1979 1980 // Direct-initialize to use the copy constructor. 1981 InitializationKind InitKind = 1982 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1983 1984 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1985 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1986 &CopyCtorArgE, 1); 1987 1988 ExprResult MemberInit 1989 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1990 MultiExprArg(&CopyCtorArgE, 1)); 1991 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1992 if (MemberInit.isInvalid()) 1993 return true; 1994 1995 CXXMemberInit 1996 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1997 MemberInit.takeAs<Expr>(), Loc, 1998 IndexVariables.data(), 1999 IndexVariables.size()); 2000 return false; 2001 } 2002 2003 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2004 2005 QualType FieldBaseElementType = 2006 SemaRef.Context.getBaseElementType(Field->getType()); 2007 2008 if (FieldBaseElementType->isRecordType()) { 2009 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2010 InitializationKind InitKind = 2011 InitializationKind::CreateDefault(Loc); 2012 2013 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2014 ExprResult MemberInit = 2015 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2016 2017 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2018 if (MemberInit.isInvalid()) 2019 return true; 2020 2021 CXXMemberInit = 2022 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2023 Field, Loc, Loc, 2024 MemberInit.get(), 2025 Loc); 2026 return false; 2027 } 2028 2029 if (!Field->getParent()->isUnion()) { 2030 if (FieldBaseElementType->isReferenceType()) { 2031 SemaRef.Diag(Constructor->getLocation(), 2032 diag::err_uninitialized_member_in_ctor) 2033 << (int)Constructor->isImplicit() 2034 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2035 << 0 << Field->getDeclName(); 2036 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2037 return true; 2038 } 2039 2040 if (FieldBaseElementType.isConstQualified()) { 2041 SemaRef.Diag(Constructor->getLocation(), 2042 diag::err_uninitialized_member_in_ctor) 2043 << (int)Constructor->isImplicit() 2044 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2045 << 1 << Field->getDeclName(); 2046 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2047 return true; 2048 } 2049 } 2050 2051 // Nothing to initialize. 2052 CXXMemberInit = 0; 2053 return false; 2054} 2055 2056namespace { 2057struct BaseAndFieldInfo { 2058 Sema &S; 2059 CXXConstructorDecl *Ctor; 2060 bool AnyErrorsInInits; 2061 ImplicitInitializerKind IIK; 2062 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2063 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2064 2065 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2066 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2067 // FIXME: Handle implicit move constructors. 2068 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2069 IIK = IIK_Copy; 2070 else 2071 IIK = IIK_Default; 2072 } 2073}; 2074} 2075 2076static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2077 FieldDecl *Top, FieldDecl *Field) { 2078 2079 // Overwhelmingly common case: we have a direct initializer for this field. 2080 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2081 Info.AllToInit.push_back(Init); 2082 return false; 2083 } 2084 2085 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2086 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2087 assert(FieldClassType && "anonymous struct/union without record type"); 2088 CXXRecordDecl *FieldClassDecl 2089 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2090 2091 // Even though union members never have non-trivial default 2092 // constructions in C++03, we still build member initializers for aggregate 2093 // record types which can be union members, and C++0x allows non-trivial 2094 // default constructors for union members, so we ensure that only one 2095 // member is initialized for these. 2096 if (FieldClassDecl->isUnion()) { 2097 // First check for an explicit initializer for one field. 2098 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2099 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2100 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2101 Info.AllToInit.push_back(Init); 2102 2103 // Once we've initialized a field of an anonymous union, the union 2104 // field in the class is also initialized, so exit immediately. 2105 return false; 2106 } else if ((*FA)->isAnonymousStructOrUnion()) { 2107 if (CollectFieldInitializer(Info, Top, *FA)) 2108 return true; 2109 } 2110 } 2111 2112 // Fallthrough and construct a default initializer for the union as 2113 // a whole, which can call its default constructor if such a thing exists 2114 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2115 // behavior going forward with C++0x, when anonymous unions there are 2116 // finalized, we should revisit this. 2117 } else { 2118 // For structs, we simply descend through to initialize all members where 2119 // necessary. 2120 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2121 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2122 if (CollectFieldInitializer(Info, Top, *FA)) 2123 return true; 2124 } 2125 } 2126 } 2127 2128 // Don't try to build an implicit initializer if there were semantic 2129 // errors in any of the initializers (and therefore we might be 2130 // missing some that the user actually wrote). 2131 if (Info.AnyErrorsInInits) 2132 return false; 2133 2134 CXXCtorInitializer *Init = 0; 2135 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2136 return true; 2137 2138 if (Init) 2139 Info.AllToInit.push_back(Init); 2140 2141 return false; 2142} 2143 2144bool 2145Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2146 CXXCtorInitializer *Initializer) { 2147 assert(Initializer->isDelegatingInitializer()); 2148 Constructor->setNumCtorInitializers(1); 2149 CXXCtorInitializer **initializer = 2150 new (Context) CXXCtorInitializer*[1]; 2151 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2152 Constructor->setCtorInitializers(initializer); 2153 2154 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2155 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2156 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2157 } 2158 2159 DelegatingCtorDecls.push_back(Constructor); 2160 2161 return false; 2162} 2163 2164bool 2165Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2166 CXXCtorInitializer **Initializers, 2167 unsigned NumInitializers, 2168 bool AnyErrors) { 2169 if (Constructor->getDeclContext()->isDependentContext()) { 2170 // Just store the initializers as written, they will be checked during 2171 // instantiation. 2172 if (NumInitializers > 0) { 2173 Constructor->setNumCtorInitializers(NumInitializers); 2174 CXXCtorInitializer **baseOrMemberInitializers = 2175 new (Context) CXXCtorInitializer*[NumInitializers]; 2176 memcpy(baseOrMemberInitializers, Initializers, 2177 NumInitializers * sizeof(CXXCtorInitializer*)); 2178 Constructor->setCtorInitializers(baseOrMemberInitializers); 2179 } 2180 2181 return false; 2182 } 2183 2184 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2185 2186 // We need to build the initializer AST according to order of construction 2187 // and not what user specified in the Initializers list. 2188 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2189 if (!ClassDecl) 2190 return true; 2191 2192 bool HadError = false; 2193 2194 for (unsigned i = 0; i < NumInitializers; i++) { 2195 CXXCtorInitializer *Member = Initializers[i]; 2196 2197 if (Member->isBaseInitializer()) 2198 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2199 else 2200 Info.AllBaseFields[Member->getAnyMember()] = Member; 2201 } 2202 2203 // Keep track of the direct virtual bases. 2204 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2205 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2206 E = ClassDecl->bases_end(); I != E; ++I) { 2207 if (I->isVirtual()) 2208 DirectVBases.insert(I); 2209 } 2210 2211 // Push virtual bases before others. 2212 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2213 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2214 2215 if (CXXCtorInitializer *Value 2216 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2217 Info.AllToInit.push_back(Value); 2218 } else if (!AnyErrors) { 2219 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2220 CXXCtorInitializer *CXXBaseInit; 2221 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2222 VBase, IsInheritedVirtualBase, 2223 CXXBaseInit)) { 2224 HadError = true; 2225 continue; 2226 } 2227 2228 Info.AllToInit.push_back(CXXBaseInit); 2229 } 2230 } 2231 2232 // Non-virtual bases. 2233 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2234 E = ClassDecl->bases_end(); Base != E; ++Base) { 2235 // Virtuals are in the virtual base list and already constructed. 2236 if (Base->isVirtual()) 2237 continue; 2238 2239 if (CXXCtorInitializer *Value 2240 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2241 Info.AllToInit.push_back(Value); 2242 } else if (!AnyErrors) { 2243 CXXCtorInitializer *CXXBaseInit; 2244 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2245 Base, /*IsInheritedVirtualBase=*/false, 2246 CXXBaseInit)) { 2247 HadError = true; 2248 continue; 2249 } 2250 2251 Info.AllToInit.push_back(CXXBaseInit); 2252 } 2253 } 2254 2255 // Fields. 2256 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2257 E = ClassDecl->field_end(); Field != E; ++Field) { 2258 if ((*Field)->getType()->isIncompleteArrayType()) { 2259 assert(ClassDecl->hasFlexibleArrayMember() && 2260 "Incomplete array type is not valid"); 2261 continue; 2262 } 2263 if (CollectFieldInitializer(Info, *Field, *Field)) 2264 HadError = true; 2265 } 2266 2267 NumInitializers = Info.AllToInit.size(); 2268 if (NumInitializers > 0) { 2269 Constructor->setNumCtorInitializers(NumInitializers); 2270 CXXCtorInitializer **baseOrMemberInitializers = 2271 new (Context) CXXCtorInitializer*[NumInitializers]; 2272 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2273 NumInitializers * sizeof(CXXCtorInitializer*)); 2274 Constructor->setCtorInitializers(baseOrMemberInitializers); 2275 2276 // Constructors implicitly reference the base and member 2277 // destructors. 2278 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2279 Constructor->getParent()); 2280 } 2281 2282 return HadError; 2283} 2284 2285static void *GetKeyForTopLevelField(FieldDecl *Field) { 2286 // For anonymous unions, use the class declaration as the key. 2287 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2288 if (RT->getDecl()->isAnonymousStructOrUnion()) 2289 return static_cast<void *>(RT->getDecl()); 2290 } 2291 return static_cast<void *>(Field); 2292} 2293 2294static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2295 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2296} 2297 2298static void *GetKeyForMember(ASTContext &Context, 2299 CXXCtorInitializer *Member) { 2300 if (!Member->isAnyMemberInitializer()) 2301 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2302 2303 // For fields injected into the class via declaration of an anonymous union, 2304 // use its anonymous union class declaration as the unique key. 2305 FieldDecl *Field = Member->getAnyMember(); 2306 2307 // If the field is a member of an anonymous struct or union, our key 2308 // is the anonymous record decl that's a direct child of the class. 2309 RecordDecl *RD = Field->getParent(); 2310 if (RD->isAnonymousStructOrUnion()) { 2311 while (true) { 2312 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2313 if (Parent->isAnonymousStructOrUnion()) 2314 RD = Parent; 2315 else 2316 break; 2317 } 2318 2319 return static_cast<void *>(RD); 2320 } 2321 2322 return static_cast<void *>(Field); 2323} 2324 2325static void 2326DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2327 const CXXConstructorDecl *Constructor, 2328 CXXCtorInitializer **Inits, 2329 unsigned NumInits) { 2330 if (Constructor->getDeclContext()->isDependentContext()) 2331 return; 2332 2333 // Don't check initializers order unless the warning is enabled at the 2334 // location of at least one initializer. 2335 bool ShouldCheckOrder = false; 2336 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2337 CXXCtorInitializer *Init = Inits[InitIndex]; 2338 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2339 Init->getSourceLocation()) 2340 != Diagnostic::Ignored) { 2341 ShouldCheckOrder = true; 2342 break; 2343 } 2344 } 2345 if (!ShouldCheckOrder) 2346 return; 2347 2348 // Build the list of bases and members in the order that they'll 2349 // actually be initialized. The explicit initializers should be in 2350 // this same order but may be missing things. 2351 llvm::SmallVector<const void*, 32> IdealInitKeys; 2352 2353 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2354 2355 // 1. Virtual bases. 2356 for (CXXRecordDecl::base_class_const_iterator VBase = 2357 ClassDecl->vbases_begin(), 2358 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2359 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2360 2361 // 2. Non-virtual bases. 2362 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2363 E = ClassDecl->bases_end(); Base != E; ++Base) { 2364 if (Base->isVirtual()) 2365 continue; 2366 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2367 } 2368 2369 // 3. Direct fields. 2370 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2371 E = ClassDecl->field_end(); Field != E; ++Field) 2372 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2373 2374 unsigned NumIdealInits = IdealInitKeys.size(); 2375 unsigned IdealIndex = 0; 2376 2377 CXXCtorInitializer *PrevInit = 0; 2378 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2379 CXXCtorInitializer *Init = Inits[InitIndex]; 2380 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2381 2382 // Scan forward to try to find this initializer in the idealized 2383 // initializers list. 2384 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2385 if (InitKey == IdealInitKeys[IdealIndex]) 2386 break; 2387 2388 // If we didn't find this initializer, it must be because we 2389 // scanned past it on a previous iteration. That can only 2390 // happen if we're out of order; emit a warning. 2391 if (IdealIndex == NumIdealInits && PrevInit) { 2392 Sema::SemaDiagnosticBuilder D = 2393 SemaRef.Diag(PrevInit->getSourceLocation(), 2394 diag::warn_initializer_out_of_order); 2395 2396 if (PrevInit->isAnyMemberInitializer()) 2397 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2398 else 2399 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2400 2401 if (Init->isAnyMemberInitializer()) 2402 D << 0 << Init->getAnyMember()->getDeclName(); 2403 else 2404 D << 1 << Init->getBaseClassInfo()->getType(); 2405 2406 // Move back to the initializer's location in the ideal list. 2407 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2408 if (InitKey == IdealInitKeys[IdealIndex]) 2409 break; 2410 2411 assert(IdealIndex != NumIdealInits && 2412 "initializer not found in initializer list"); 2413 } 2414 2415 PrevInit = Init; 2416 } 2417} 2418 2419namespace { 2420bool CheckRedundantInit(Sema &S, 2421 CXXCtorInitializer *Init, 2422 CXXCtorInitializer *&PrevInit) { 2423 if (!PrevInit) { 2424 PrevInit = Init; 2425 return false; 2426 } 2427 2428 if (FieldDecl *Field = Init->getMember()) 2429 S.Diag(Init->getSourceLocation(), 2430 diag::err_multiple_mem_initialization) 2431 << Field->getDeclName() 2432 << Init->getSourceRange(); 2433 else { 2434 const Type *BaseClass = Init->getBaseClass(); 2435 assert(BaseClass && "neither field nor base"); 2436 S.Diag(Init->getSourceLocation(), 2437 diag::err_multiple_base_initialization) 2438 << QualType(BaseClass, 0) 2439 << Init->getSourceRange(); 2440 } 2441 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2442 << 0 << PrevInit->getSourceRange(); 2443 2444 return true; 2445} 2446 2447typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2448typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2449 2450bool CheckRedundantUnionInit(Sema &S, 2451 CXXCtorInitializer *Init, 2452 RedundantUnionMap &Unions) { 2453 FieldDecl *Field = Init->getAnyMember(); 2454 RecordDecl *Parent = Field->getParent(); 2455 if (!Parent->isAnonymousStructOrUnion()) 2456 return false; 2457 2458 NamedDecl *Child = Field; 2459 do { 2460 if (Parent->isUnion()) { 2461 UnionEntry &En = Unions[Parent]; 2462 if (En.first && En.first != Child) { 2463 S.Diag(Init->getSourceLocation(), 2464 diag::err_multiple_mem_union_initialization) 2465 << Field->getDeclName() 2466 << Init->getSourceRange(); 2467 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2468 << 0 << En.second->getSourceRange(); 2469 return true; 2470 } else if (!En.first) { 2471 En.first = Child; 2472 En.second = Init; 2473 } 2474 } 2475 2476 Child = Parent; 2477 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2478 } while (Parent->isAnonymousStructOrUnion()); 2479 2480 return false; 2481} 2482} 2483 2484/// ActOnMemInitializers - Handle the member initializers for a constructor. 2485void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2486 SourceLocation ColonLoc, 2487 MemInitTy **meminits, unsigned NumMemInits, 2488 bool AnyErrors) { 2489 if (!ConstructorDecl) 2490 return; 2491 2492 AdjustDeclIfTemplate(ConstructorDecl); 2493 2494 CXXConstructorDecl *Constructor 2495 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2496 2497 if (!Constructor) { 2498 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2499 return; 2500 } 2501 2502 CXXCtorInitializer **MemInits = 2503 reinterpret_cast<CXXCtorInitializer **>(meminits); 2504 2505 // Mapping for the duplicate initializers check. 2506 // For member initializers, this is keyed with a FieldDecl*. 2507 // For base initializers, this is keyed with a Type*. 2508 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2509 2510 // Mapping for the inconsistent anonymous-union initializers check. 2511 RedundantUnionMap MemberUnions; 2512 2513 bool HadError = false; 2514 for (unsigned i = 0; i < NumMemInits; i++) { 2515 CXXCtorInitializer *Init = MemInits[i]; 2516 2517 // Set the source order index. 2518 Init->setSourceOrder(i); 2519 2520 if (Init->isAnyMemberInitializer()) { 2521 FieldDecl *Field = Init->getAnyMember(); 2522 if (CheckRedundantInit(*this, Init, Members[Field]) || 2523 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2524 HadError = true; 2525 } else if (Init->isBaseInitializer()) { 2526 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2527 if (CheckRedundantInit(*this, Init, Members[Key])) 2528 HadError = true; 2529 } else { 2530 assert(Init->isDelegatingInitializer()); 2531 // This must be the only initializer 2532 if (i != 0 || NumMemInits > 1) { 2533 Diag(MemInits[0]->getSourceLocation(), 2534 diag::err_delegating_initializer_alone) 2535 << MemInits[0]->getSourceRange(); 2536 HadError = true; 2537 // We will treat this as being the only initializer. 2538 } 2539 SetDelegatingInitializer(Constructor, MemInits[i]); 2540 // Return immediately as the initializer is set. 2541 return; 2542 } 2543 } 2544 2545 if (HadError) 2546 return; 2547 2548 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2549 2550 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2551} 2552 2553void 2554Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2555 CXXRecordDecl *ClassDecl) { 2556 // Ignore dependent contexts. 2557 if (ClassDecl->isDependentContext()) 2558 return; 2559 2560 // FIXME: all the access-control diagnostics are positioned on the 2561 // field/base declaration. That's probably good; that said, the 2562 // user might reasonably want to know why the destructor is being 2563 // emitted, and we currently don't say. 2564 2565 // Non-static data members. 2566 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2567 E = ClassDecl->field_end(); I != E; ++I) { 2568 FieldDecl *Field = *I; 2569 if (Field->isInvalidDecl()) 2570 continue; 2571 QualType FieldType = Context.getBaseElementType(Field->getType()); 2572 2573 const RecordType* RT = FieldType->getAs<RecordType>(); 2574 if (!RT) 2575 continue; 2576 2577 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2578 if (FieldClassDecl->isInvalidDecl()) 2579 continue; 2580 if (FieldClassDecl->hasTrivialDestructor()) 2581 continue; 2582 2583 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2584 assert(Dtor && "No dtor found for FieldClassDecl!"); 2585 CheckDestructorAccess(Field->getLocation(), Dtor, 2586 PDiag(diag::err_access_dtor_field) 2587 << Field->getDeclName() 2588 << FieldType); 2589 2590 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2591 } 2592 2593 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2594 2595 // Bases. 2596 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2597 E = ClassDecl->bases_end(); Base != E; ++Base) { 2598 // Bases are always records in a well-formed non-dependent class. 2599 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2600 2601 // Remember direct virtual bases. 2602 if (Base->isVirtual()) 2603 DirectVirtualBases.insert(RT); 2604 2605 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2606 // If our base class is invalid, we probably can't get its dtor anyway. 2607 if (BaseClassDecl->isInvalidDecl()) 2608 continue; 2609 // Ignore trivial destructors. 2610 if (BaseClassDecl->hasTrivialDestructor()) 2611 continue; 2612 2613 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2614 assert(Dtor && "No dtor found for BaseClassDecl!"); 2615 2616 // FIXME: caret should be on the start of the class name 2617 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2618 PDiag(diag::err_access_dtor_base) 2619 << Base->getType() 2620 << Base->getSourceRange()); 2621 2622 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2623 } 2624 2625 // Virtual bases. 2626 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2627 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2628 2629 // Bases are always records in a well-formed non-dependent class. 2630 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2631 2632 // Ignore direct virtual bases. 2633 if (DirectVirtualBases.count(RT)) 2634 continue; 2635 2636 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2637 // If our base class is invalid, we probably can't get its dtor anyway. 2638 if (BaseClassDecl->isInvalidDecl()) 2639 continue; 2640 // Ignore trivial destructors. 2641 if (BaseClassDecl->hasTrivialDestructor()) 2642 continue; 2643 2644 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2645 assert(Dtor && "No dtor found for BaseClassDecl!"); 2646 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2647 PDiag(diag::err_access_dtor_vbase) 2648 << VBase->getType()); 2649 2650 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2651 } 2652} 2653 2654void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2655 if (!CDtorDecl) 2656 return; 2657 2658 if (CXXConstructorDecl *Constructor 2659 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2660 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2661} 2662 2663bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2664 unsigned DiagID, AbstractDiagSelID SelID) { 2665 if (SelID == -1) 2666 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2667 else 2668 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2669} 2670 2671bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2672 const PartialDiagnostic &PD) { 2673 if (!getLangOptions().CPlusPlus) 2674 return false; 2675 2676 if (const ArrayType *AT = Context.getAsArrayType(T)) 2677 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2678 2679 if (const PointerType *PT = T->getAs<PointerType>()) { 2680 // Find the innermost pointer type. 2681 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2682 PT = T; 2683 2684 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2685 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2686 } 2687 2688 const RecordType *RT = T->getAs<RecordType>(); 2689 if (!RT) 2690 return false; 2691 2692 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2693 2694 // We can't answer whether something is abstract until it has a 2695 // definition. If it's currently being defined, we'll walk back 2696 // over all the declarations when we have a full definition. 2697 const CXXRecordDecl *Def = RD->getDefinition(); 2698 if (!Def || Def->isBeingDefined()) 2699 return false; 2700 2701 if (!RD->isAbstract()) 2702 return false; 2703 2704 Diag(Loc, PD) << RD->getDeclName(); 2705 DiagnoseAbstractType(RD); 2706 2707 return true; 2708} 2709 2710void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2711 // Check if we've already emitted the list of pure virtual functions 2712 // for this class. 2713 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2714 return; 2715 2716 CXXFinalOverriderMap FinalOverriders; 2717 RD->getFinalOverriders(FinalOverriders); 2718 2719 // Keep a set of seen pure methods so we won't diagnose the same method 2720 // more than once. 2721 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2722 2723 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2724 MEnd = FinalOverriders.end(); 2725 M != MEnd; 2726 ++M) { 2727 for (OverridingMethods::iterator SO = M->second.begin(), 2728 SOEnd = M->second.end(); 2729 SO != SOEnd; ++SO) { 2730 // C++ [class.abstract]p4: 2731 // A class is abstract if it contains or inherits at least one 2732 // pure virtual function for which the final overrider is pure 2733 // virtual. 2734 2735 // 2736 if (SO->second.size() != 1) 2737 continue; 2738 2739 if (!SO->second.front().Method->isPure()) 2740 continue; 2741 2742 if (!SeenPureMethods.insert(SO->second.front().Method)) 2743 continue; 2744 2745 Diag(SO->second.front().Method->getLocation(), 2746 diag::note_pure_virtual_function) 2747 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2748 } 2749 } 2750 2751 if (!PureVirtualClassDiagSet) 2752 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2753 PureVirtualClassDiagSet->insert(RD); 2754} 2755 2756namespace { 2757struct AbstractUsageInfo { 2758 Sema &S; 2759 CXXRecordDecl *Record; 2760 CanQualType AbstractType; 2761 bool Invalid; 2762 2763 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2764 : S(S), Record(Record), 2765 AbstractType(S.Context.getCanonicalType( 2766 S.Context.getTypeDeclType(Record))), 2767 Invalid(false) {} 2768 2769 void DiagnoseAbstractType() { 2770 if (Invalid) return; 2771 S.DiagnoseAbstractType(Record); 2772 Invalid = true; 2773 } 2774 2775 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2776}; 2777 2778struct CheckAbstractUsage { 2779 AbstractUsageInfo &Info; 2780 const NamedDecl *Ctx; 2781 2782 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2783 : Info(Info), Ctx(Ctx) {} 2784 2785 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2786 switch (TL.getTypeLocClass()) { 2787#define ABSTRACT_TYPELOC(CLASS, PARENT) 2788#define TYPELOC(CLASS, PARENT) \ 2789 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2790#include "clang/AST/TypeLocNodes.def" 2791 } 2792 } 2793 2794 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2795 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2796 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2797 if (!TL.getArg(I)) 2798 continue; 2799 2800 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2801 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2802 } 2803 } 2804 2805 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2806 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2807 } 2808 2809 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2810 // Visit the type parameters from a permissive context. 2811 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2812 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2813 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2814 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2815 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2816 // TODO: other template argument types? 2817 } 2818 } 2819 2820 // Visit pointee types from a permissive context. 2821#define CheckPolymorphic(Type) \ 2822 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2823 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2824 } 2825 CheckPolymorphic(PointerTypeLoc) 2826 CheckPolymorphic(ReferenceTypeLoc) 2827 CheckPolymorphic(MemberPointerTypeLoc) 2828 CheckPolymorphic(BlockPointerTypeLoc) 2829 2830 /// Handle all the types we haven't given a more specific 2831 /// implementation for above. 2832 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2833 // Every other kind of type that we haven't called out already 2834 // that has an inner type is either (1) sugar or (2) contains that 2835 // inner type in some way as a subobject. 2836 if (TypeLoc Next = TL.getNextTypeLoc()) 2837 return Visit(Next, Sel); 2838 2839 // If there's no inner type and we're in a permissive context, 2840 // don't diagnose. 2841 if (Sel == Sema::AbstractNone) return; 2842 2843 // Check whether the type matches the abstract type. 2844 QualType T = TL.getType(); 2845 if (T->isArrayType()) { 2846 Sel = Sema::AbstractArrayType; 2847 T = Info.S.Context.getBaseElementType(T); 2848 } 2849 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2850 if (CT != Info.AbstractType) return; 2851 2852 // It matched; do some magic. 2853 if (Sel == Sema::AbstractArrayType) { 2854 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2855 << T << TL.getSourceRange(); 2856 } else { 2857 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2858 << Sel << T << TL.getSourceRange(); 2859 } 2860 Info.DiagnoseAbstractType(); 2861 } 2862}; 2863 2864void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2865 Sema::AbstractDiagSelID Sel) { 2866 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2867} 2868 2869} 2870 2871/// Check for invalid uses of an abstract type in a method declaration. 2872static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2873 CXXMethodDecl *MD) { 2874 // No need to do the check on definitions, which require that 2875 // the return/param types be complete. 2876 if (MD->doesThisDeclarationHaveABody()) 2877 return; 2878 2879 // For safety's sake, just ignore it if we don't have type source 2880 // information. This should never happen for non-implicit methods, 2881 // but... 2882 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2883 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2884} 2885 2886/// Check for invalid uses of an abstract type within a class definition. 2887static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2888 CXXRecordDecl *RD) { 2889 for (CXXRecordDecl::decl_iterator 2890 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2891 Decl *D = *I; 2892 if (D->isImplicit()) continue; 2893 2894 // Methods and method templates. 2895 if (isa<CXXMethodDecl>(D)) { 2896 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2897 } else if (isa<FunctionTemplateDecl>(D)) { 2898 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2899 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2900 2901 // Fields and static variables. 2902 } else if (isa<FieldDecl>(D)) { 2903 FieldDecl *FD = cast<FieldDecl>(D); 2904 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2905 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2906 } else if (isa<VarDecl>(D)) { 2907 VarDecl *VD = cast<VarDecl>(D); 2908 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2909 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2910 2911 // Nested classes and class templates. 2912 } else if (isa<CXXRecordDecl>(D)) { 2913 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2914 } else if (isa<ClassTemplateDecl>(D)) { 2915 CheckAbstractClassUsage(Info, 2916 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2917 } 2918 } 2919} 2920 2921/// \brief Perform semantic checks on a class definition that has been 2922/// completing, introducing implicitly-declared members, checking for 2923/// abstract types, etc. 2924void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2925 if (!Record) 2926 return; 2927 2928 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2929 AbstractUsageInfo Info(*this, Record); 2930 CheckAbstractClassUsage(Info, Record); 2931 } 2932 2933 // If this is not an aggregate type and has no user-declared constructor, 2934 // complain about any non-static data members of reference or const scalar 2935 // type, since they will never get initializers. 2936 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2937 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2938 bool Complained = false; 2939 for (RecordDecl::field_iterator F = Record->field_begin(), 2940 FEnd = Record->field_end(); 2941 F != FEnd; ++F) { 2942 if (F->getType()->isReferenceType() || 2943 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2944 if (!Complained) { 2945 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2946 << Record->getTagKind() << Record; 2947 Complained = true; 2948 } 2949 2950 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2951 << F->getType()->isReferenceType() 2952 << F->getDeclName(); 2953 } 2954 } 2955 } 2956 2957 if (Record->isDynamicClass() && !Record->isDependentType()) 2958 DynamicClasses.push_back(Record); 2959 2960 if (Record->getIdentifier()) { 2961 // C++ [class.mem]p13: 2962 // If T is the name of a class, then each of the following shall have a 2963 // name different from T: 2964 // - every member of every anonymous union that is a member of class T. 2965 // 2966 // C++ [class.mem]p14: 2967 // In addition, if class T has a user-declared constructor (12.1), every 2968 // non-static data member of class T shall have a name different from T. 2969 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2970 R.first != R.second; ++R.first) { 2971 NamedDecl *D = *R.first; 2972 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2973 isa<IndirectFieldDecl>(D)) { 2974 Diag(D->getLocation(), diag::err_member_name_of_class) 2975 << D->getDeclName(); 2976 break; 2977 } 2978 } 2979 } 2980 2981 // Warn if the class has virtual methods but non-virtual public destructor. 2982 if (Record->isPolymorphic() && !Record->isDependentType()) { 2983 CXXDestructorDecl *dtor = Record->getDestructor(); 2984 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2985 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2986 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2987 } 2988 2989 // See if a method overloads virtual methods in a base 2990 /// class without overriding any. 2991 if (!Record->isDependentType()) { 2992 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2993 MEnd = Record->method_end(); 2994 M != MEnd; ++M) { 2995 if (!(*M)->isStatic()) 2996 DiagnoseHiddenVirtualMethods(Record, *M); 2997 } 2998 } 2999 3000 // Declare inherited constructors. We do this eagerly here because: 3001 // - The standard requires an eager diagnostic for conflicting inherited 3002 // constructors from different classes. 3003 // - The lazy declaration of the other implicit constructors is so as to not 3004 // waste space and performance on classes that are not meant to be 3005 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3006 // have inherited constructors. 3007 DeclareInheritedConstructors(Record); 3008 3009 if (!Record->isDependentType()) 3010 CheckExplicitlyDefaultedMethods(Record); 3011} 3012 3013void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3014 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3015 ME = Record->method_end(); 3016 MI != ME; ++MI) { 3017 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3018 switch (getSpecialMember(*MI)) { 3019 case CXXDefaultConstructor: 3020 CheckExplicitlyDefaultedDefaultConstructor( 3021 cast<CXXConstructorDecl>(*MI)); 3022 break; 3023 3024 case CXXDestructor: 3025 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3026 break; 3027 3028 case CXXCopyConstructor: 3029 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3030 break; 3031 3032 case CXXCopyAssignment: 3033 CheckExplicitlyDefaultedCopyAssignment(*MI); 3034 break; 3035 3036 case CXXMoveConstructor: 3037 case CXXMoveAssignment: 3038 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3039 break; 3040 3041 default: 3042 // FIXME: Do moves once they exist 3043 llvm_unreachable("non-special member explicitly defaulted!"); 3044 } 3045 } 3046 } 3047 3048} 3049 3050void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3051 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3052 3053 // Whether this was the first-declared instance of the constructor. 3054 // This affects whether we implicitly add an exception spec (and, eventually, 3055 // constexpr). It is also ill-formed to explicitly default a constructor such 3056 // that it would be deleted. (C++0x [decl.fct.def.default]) 3057 bool First = CD == CD->getCanonicalDecl(); 3058 3059 bool HadError = false; 3060 if (CD->getNumParams() != 0) { 3061 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3062 << CD->getSourceRange(); 3063 HadError = true; 3064 } 3065 3066 ImplicitExceptionSpecification Spec 3067 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3068 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3069 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3070 *ExceptionType = Context.getFunctionType( 3071 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3072 3073 if (CtorType->hasExceptionSpec()) { 3074 if (CheckEquivalentExceptionSpec( 3075 PDiag(diag::err_incorrect_defaulted_exception_spec) 3076 << CXXDefaultConstructor, 3077 PDiag(), 3078 ExceptionType, SourceLocation(), 3079 CtorType, CD->getLocation())) { 3080 HadError = true; 3081 } 3082 } else if (First) { 3083 // We set the declaration to have the computed exception spec here. 3084 // We know there are no parameters. 3085 EPI.ExtInfo = CtorType->getExtInfo(); 3086 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3087 } 3088 3089 if (HadError) { 3090 CD->setInvalidDecl(); 3091 return; 3092 } 3093 3094 if (ShouldDeleteDefaultConstructor(CD)) { 3095 if (First) { 3096 CD->setDeletedAsWritten(); 3097 } else { 3098 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3099 << CXXDefaultConstructor; 3100 CD->setInvalidDecl(); 3101 } 3102 } 3103} 3104 3105void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3106 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3107 3108 // Whether this was the first-declared instance of the constructor. 3109 bool First = CD == CD->getCanonicalDecl(); 3110 3111 bool HadError = false; 3112 if (CD->getNumParams() != 1) { 3113 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3114 << CD->getSourceRange(); 3115 HadError = true; 3116 } 3117 3118 ImplicitExceptionSpecification Spec(Context); 3119 bool Const; 3120 llvm::tie(Spec, Const) = 3121 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3122 3123 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3124 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3125 *ExceptionType = Context.getFunctionType( 3126 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3127 3128 // Check for parameter type matching. 3129 // This is a copy ctor so we know it's a cv-qualified reference to T. 3130 QualType ArgType = CtorType->getArgType(0); 3131 if (ArgType->getPointeeType().isVolatileQualified()) { 3132 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3133 HadError = true; 3134 } 3135 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3136 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3137 HadError = true; 3138 } 3139 3140 if (CtorType->hasExceptionSpec()) { 3141 if (CheckEquivalentExceptionSpec( 3142 PDiag(diag::err_incorrect_defaulted_exception_spec) 3143 << CXXCopyConstructor, 3144 PDiag(), 3145 ExceptionType, SourceLocation(), 3146 CtorType, CD->getLocation())) { 3147 HadError = true; 3148 } 3149 } else if (First) { 3150 // We set the declaration to have the computed exception spec here. 3151 // We duplicate the one parameter type. 3152 EPI.ExtInfo = CtorType->getExtInfo(); 3153 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3154 } 3155 3156 if (HadError) { 3157 CD->setInvalidDecl(); 3158 return; 3159 } 3160 3161 if (ShouldDeleteCopyConstructor(CD)) { 3162 if (First) { 3163 CD->setDeletedAsWritten(); 3164 } else { 3165 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3166 << CXXCopyConstructor; 3167 CD->setInvalidDecl(); 3168 } 3169 } 3170} 3171 3172void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3173 assert(MD->isExplicitlyDefaulted()); 3174 3175 // Whether this was the first-declared instance of the operator 3176 bool First = MD == MD->getCanonicalDecl(); 3177 3178 bool HadError = false; 3179 if (MD->getNumParams() != 1) { 3180 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3181 << MD->getSourceRange(); 3182 HadError = true; 3183 } 3184 3185 QualType ReturnType = 3186 MD->getType()->getAs<FunctionType>()->getResultType(); 3187 if (!ReturnType->isLValueReferenceType() || 3188 !Context.hasSameType( 3189 Context.getCanonicalType(ReturnType->getPointeeType()), 3190 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3191 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3192 HadError = true; 3193 } 3194 3195 ImplicitExceptionSpecification Spec(Context); 3196 bool Const; 3197 llvm::tie(Spec, Const) = 3198 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3199 3200 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3201 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3202 *ExceptionType = Context.getFunctionType( 3203 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3204 3205 QualType ArgType = OperType->getArgType(0); 3206 if (!ArgType->isReferenceType()) { 3207 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3208 HadError = true; 3209 } else { 3210 if (ArgType->getPointeeType().isVolatileQualified()) { 3211 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3212 HadError = true; 3213 } 3214 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3215 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3216 HadError = true; 3217 } 3218 } 3219 3220 if (OperType->getTypeQuals()) { 3221 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3222 HadError = true; 3223 } 3224 3225 if (OperType->hasExceptionSpec()) { 3226 if (CheckEquivalentExceptionSpec( 3227 PDiag(diag::err_incorrect_defaulted_exception_spec) 3228 << CXXCopyAssignment, 3229 PDiag(), 3230 ExceptionType, SourceLocation(), 3231 OperType, MD->getLocation())) { 3232 HadError = true; 3233 } 3234 } else if (First) { 3235 // We set the declaration to have the computed exception spec here. 3236 // We duplicate the one parameter type. 3237 EPI.RefQualifier = OperType->getRefQualifier(); 3238 EPI.ExtInfo = OperType->getExtInfo(); 3239 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3240 } 3241 3242 if (HadError) { 3243 MD->setInvalidDecl(); 3244 return; 3245 } 3246 3247 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3248 if (First) { 3249 MD->setDeletedAsWritten(); 3250 } else { 3251 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3252 << CXXCopyAssignment; 3253 MD->setInvalidDecl(); 3254 } 3255 } 3256} 3257 3258void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3259 assert(DD->isExplicitlyDefaulted()); 3260 3261 // Whether this was the first-declared instance of the destructor. 3262 bool First = DD == DD->getCanonicalDecl(); 3263 3264 ImplicitExceptionSpecification Spec 3265 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3266 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3267 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3268 *ExceptionType = Context.getFunctionType( 3269 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3270 3271 if (DtorType->hasExceptionSpec()) { 3272 if (CheckEquivalentExceptionSpec( 3273 PDiag(diag::err_incorrect_defaulted_exception_spec) 3274 << CXXDestructor, 3275 PDiag(), 3276 ExceptionType, SourceLocation(), 3277 DtorType, DD->getLocation())) { 3278 DD->setInvalidDecl(); 3279 return; 3280 } 3281 } else if (First) { 3282 // We set the declaration to have the computed exception spec here. 3283 // There are no parameters. 3284 EPI.ExtInfo = DtorType->getExtInfo(); 3285 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3286 } 3287 3288 if (ShouldDeleteDestructor(DD)) { 3289 if (First) { 3290 DD->setDeletedAsWritten(); 3291 } else { 3292 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3293 << CXXDestructor; 3294 DD->setInvalidDecl(); 3295 } 3296 } 3297} 3298 3299bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3300 CXXRecordDecl *RD = CD->getParent(); 3301 assert(!RD->isDependentType() && "do deletion after instantiation"); 3302 if (!LangOpts.CPlusPlus0x) 3303 return false; 3304 3305 SourceLocation Loc = CD->getLocation(); 3306 3307 // Do access control from the constructor 3308 ContextRAII CtorContext(*this, CD); 3309 3310 bool Union = RD->isUnion(); 3311 bool AllConst = true; 3312 3313 // We do this because we should never actually use an anonymous 3314 // union's constructor. 3315 if (Union && RD->isAnonymousStructOrUnion()) 3316 return false; 3317 3318 // FIXME: We should put some diagnostic logic right into this function. 3319 3320 // C++0x [class.ctor]/5 3321 // A defaulted default constructor for class X is defined as deleted if: 3322 3323 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3324 BE = RD->bases_end(); 3325 BI != BE; ++BI) { 3326 // We'll handle this one later 3327 if (BI->isVirtual()) 3328 continue; 3329 3330 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3331 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3332 3333 // -- any [direct base class] has a type with a destructor that is 3334 // deleted or inaccessible from the defaulted default constructor 3335 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3336 if (BaseDtor->isDeleted()) 3337 return true; 3338 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3339 AR_accessible) 3340 return true; 3341 3342 // -- any [direct base class either] has no default constructor or 3343 // overload resolution as applied to [its] default constructor 3344 // results in an ambiguity or in a function that is deleted or 3345 // inaccessible from the defaulted default constructor 3346 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3347 if (!BaseDefault || BaseDefault->isDeleted()) 3348 return true; 3349 3350 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3351 PDiag()) != AR_accessible) 3352 return true; 3353 } 3354 3355 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3356 BE = RD->vbases_end(); 3357 BI != BE; ++BI) { 3358 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3359 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3360 3361 // -- any [virtual base class] has a type with a destructor that is 3362 // delete or inaccessible from the defaulted default constructor 3363 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3364 if (BaseDtor->isDeleted()) 3365 return true; 3366 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3367 AR_accessible) 3368 return true; 3369 3370 // -- any [virtual base class either] has no default constructor or 3371 // overload resolution as applied to [its] default constructor 3372 // results in an ambiguity or in a function that is deleted or 3373 // inaccessible from the defaulted default constructor 3374 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3375 if (!BaseDefault || BaseDefault->isDeleted()) 3376 return true; 3377 3378 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3379 PDiag()) != AR_accessible) 3380 return true; 3381 } 3382 3383 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3384 FE = RD->field_end(); 3385 FI != FE; ++FI) { 3386 QualType FieldType = Context.getBaseElementType(FI->getType()); 3387 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3388 3389 // -- any non-static data member with no brace-or-equal-initializer is of 3390 // reference type 3391 if (FieldType->isReferenceType()) 3392 return true; 3393 3394 // -- X is a union and all its variant members are of const-qualified type 3395 // (or array thereof) 3396 if (Union && !FieldType.isConstQualified()) 3397 AllConst = false; 3398 3399 if (FieldRecord) { 3400 // -- X is a union-like class that has a variant member with a non-trivial 3401 // default constructor 3402 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3403 return true; 3404 3405 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3406 if (FieldDtor->isDeleted()) 3407 return true; 3408 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3409 AR_accessible) 3410 return true; 3411 3412 // -- any non-variant non-static data member of const-qualified type (or 3413 // array thereof) with no brace-or-equal-initializer does not have a 3414 // user-provided default constructor 3415 if (FieldType.isConstQualified() && 3416 !FieldRecord->hasUserProvidedDefaultConstructor()) 3417 return true; 3418 3419 if (!Union && FieldRecord->isUnion() && 3420 FieldRecord->isAnonymousStructOrUnion()) { 3421 // We're okay to reuse AllConst here since we only care about the 3422 // value otherwise if we're in a union. 3423 AllConst = true; 3424 3425 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3426 UE = FieldRecord->field_end(); 3427 UI != UE; ++UI) { 3428 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3429 CXXRecordDecl *UnionFieldRecord = 3430 UnionFieldType->getAsCXXRecordDecl(); 3431 3432 if (!UnionFieldType.isConstQualified()) 3433 AllConst = false; 3434 3435 if (UnionFieldRecord && 3436 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3437 return true; 3438 } 3439 3440 if (AllConst) 3441 return true; 3442 3443 // Don't try to initialize the anonymous union 3444 // This is technically non-conformant, but sanity demands it. 3445 continue; 3446 } 3447 3448 // -- any non-static data member ... has class type M (or array thereof) 3449 // and either M has no default constructor or overload resolution as 3450 // applied to M's default constructor results in an ambiguity or in a 3451 // function that is deleted or inaccessible from the defaulted default 3452 // constructor. 3453 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3454 if (!FieldDefault || FieldDefault->isDeleted()) 3455 return true; 3456 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3457 PDiag()) != AR_accessible) 3458 return true; 3459 } else if (!Union && FieldType.isConstQualified()) { 3460 // -- any non-variant non-static data member of const-qualified type (or 3461 // array thereof) with no brace-or-equal-initializer does not have a 3462 // user-provided default constructor 3463 return true; 3464 } 3465 } 3466 3467 if (Union && AllConst) 3468 return true; 3469 3470 return false; 3471} 3472 3473bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3474 CXXRecordDecl *RD = CD->getParent(); 3475 assert(!RD->isDependentType() && "do deletion after instantiation"); 3476 if (!LangOpts.CPlusPlus0x) 3477 return false; 3478 3479 SourceLocation Loc = CD->getLocation(); 3480 3481 // Do access control from the constructor 3482 ContextRAII CtorContext(*this, CD); 3483 3484 bool Union = RD->isUnion(); 3485 3486 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3487 "copy assignment arg has no pointee type"); 3488 unsigned ArgQuals = 3489 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3490 Qualifiers::Const : 0; 3491 3492 // We do this because we should never actually use an anonymous 3493 // union's constructor. 3494 if (Union && RD->isAnonymousStructOrUnion()) 3495 return false; 3496 3497 // FIXME: We should put some diagnostic logic right into this function. 3498 3499 // C++0x [class.copy]/11 3500 // A defaulted [copy] constructor for class X is defined as delete if X has: 3501 3502 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3503 BE = RD->bases_end(); 3504 BI != BE; ++BI) { 3505 // We'll handle this one later 3506 if (BI->isVirtual()) 3507 continue; 3508 3509 QualType BaseType = BI->getType(); 3510 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3511 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3512 3513 // -- any [direct base class] of a type with a destructor that is deleted or 3514 // inaccessible from the defaulted constructor 3515 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3516 if (BaseDtor->isDeleted()) 3517 return true; 3518 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3519 AR_accessible) 3520 return true; 3521 3522 // -- a [direct base class] B that cannot be [copied] because overload 3523 // resolution, as applied to B's [copy] constructor, results in an 3524 // ambiguity or a function that is deleted or inaccessible from the 3525 // defaulted constructor 3526 CXXConstructorDecl *BaseCtor = LookupCopyConstructor(BaseDecl, ArgQuals); 3527 if (!BaseCtor || BaseCtor->isDeleted()) 3528 return true; 3529 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3530 AR_accessible) 3531 return true; 3532 } 3533 3534 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3535 BE = RD->vbases_end(); 3536 BI != BE; ++BI) { 3537 QualType BaseType = BI->getType(); 3538 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3539 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3540 3541 // -- any [virtual base class] of a type with a destructor that is deleted or 3542 // inaccessible from the defaulted constructor 3543 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3544 if (BaseDtor->isDeleted()) 3545 return true; 3546 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3547 AR_accessible) 3548 return true; 3549 3550 // -- a [virtual base class] B that cannot be [copied] because overload 3551 // resolution, as applied to B's [copy] constructor, results in an 3552 // ambiguity or a function that is deleted or inaccessible from the 3553 // defaulted constructor 3554 CXXConstructorDecl *BaseCtor = LookupCopyConstructor(BaseDecl, ArgQuals); 3555 if (!BaseCtor || BaseCtor->isDeleted()) 3556 return true; 3557 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3558 AR_accessible) 3559 return true; 3560 } 3561 3562 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3563 FE = RD->field_end(); 3564 FI != FE; ++FI) { 3565 QualType FieldType = Context.getBaseElementType(FI->getType()); 3566 3567 // -- for a copy constructor, a non-static data member of rvalue reference 3568 // type 3569 if (FieldType->isRValueReferenceType()) 3570 return true; 3571 3572 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3573 3574 if (FieldRecord) { 3575 // This is an anonymous union 3576 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3577 // Anonymous unions inside unions do not variant members create 3578 if (!Union) { 3579 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3580 UE = FieldRecord->field_end(); 3581 UI != UE; ++UI) { 3582 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3583 CXXRecordDecl *UnionFieldRecord = 3584 UnionFieldType->getAsCXXRecordDecl(); 3585 3586 // -- a variant member with a non-trivial [copy] constructor and X 3587 // is a union-like class 3588 if (UnionFieldRecord && 3589 !UnionFieldRecord->hasTrivialCopyConstructor()) 3590 return true; 3591 } 3592 } 3593 3594 // Don't try to initalize an anonymous union 3595 continue; 3596 } else { 3597 // -- a variant member with a non-trivial [copy] constructor and X is a 3598 // union-like class 3599 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3600 return true; 3601 3602 // -- any [non-static data member] of a type with a destructor that is 3603 // deleted or inaccessible from the defaulted constructor 3604 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3605 if (FieldDtor->isDeleted()) 3606 return true; 3607 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3608 AR_accessible) 3609 return true; 3610 } 3611 3612 // -- a [non-static data member of class type (or array thereof)] B that 3613 // cannot be [copied] because overload resolution, as applied to B's 3614 // [copy] constructor, results in an ambiguity or a function that is 3615 // deleted or inaccessible from the defaulted constructor 3616 CXXConstructorDecl *FieldCtor = LookupCopyConstructor(FieldRecord, 3617 ArgQuals); 3618 if (!FieldCtor || FieldCtor->isDeleted()) 3619 return true; 3620 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3621 PDiag()) != AR_accessible) 3622 return true; 3623 } 3624 } 3625 3626 return false; 3627} 3628 3629bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3630 CXXRecordDecl *RD = MD->getParent(); 3631 assert(!RD->isDependentType() && "do deletion after instantiation"); 3632 if (!LangOpts.CPlusPlus0x) 3633 return false; 3634 3635 SourceLocation Loc = MD->getLocation(); 3636 3637 // Do access control from the constructor 3638 ContextRAII MethodContext(*this, MD); 3639 3640 bool Union = RD->isUnion(); 3641 3642 bool ConstArg = 3643 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified(); 3644 3645 // We do this because we should never actually use an anonymous 3646 // union's constructor. 3647 if (Union && RD->isAnonymousStructOrUnion()) 3648 return false; 3649 3650 DeclarationName OperatorName = 3651 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 3652 LookupResult R(*this, OperatorName, Loc, LookupOrdinaryName); 3653 R.suppressDiagnostics(); 3654 3655 // FIXME: We should put some diagnostic logic right into this function. 3656 3657 // C++0x [class.copy]/11 3658 // A defaulted [copy] assignment operator for class X is defined as deleted 3659 // if X has: 3660 3661 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3662 BE = RD->bases_end(); 3663 BI != BE; ++BI) { 3664 // We'll handle this one later 3665 if (BI->isVirtual()) 3666 continue; 3667 3668 QualType BaseType = BI->getType(); 3669 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3670 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3671 3672 // -- a [direct base class] B that cannot be [copied] because overload 3673 // resolution, as applied to B's [copy] assignment operator, results in 3674 // an ambiguity or a function that is deleted or inaccessible from the 3675 // assignment operator 3676 3677 LookupQualifiedName(R, BaseDecl, false); 3678 3679 // Filter out any result that isn't a copy-assignment operator. 3680 LookupResult::Filter F = R.makeFilter(); 3681 while (F.hasNext()) { 3682 NamedDecl *D = F.next(); 3683 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3684 if (Method->isCopyAssignmentOperator()) 3685 continue; 3686 3687 F.erase(); 3688 } 3689 F.done(); 3690 3691 // Build a fake argument expression 3692 QualType ArgType = BaseType; 3693 QualType ThisType = BaseType; 3694 if (ConstArg) 3695 ArgType.addConst(); 3696 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3697 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3698 }; 3699 3700 OverloadCandidateSet OCS((Loc)); 3701 OverloadCandidateSet::iterator Best; 3702 3703 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3704 3705 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3706 OR_Success) 3707 return true; 3708 } 3709 3710 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3711 BE = RD->vbases_end(); 3712 BI != BE; ++BI) { 3713 QualType BaseType = BI->getType(); 3714 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3715 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3716 3717 // -- a [virtual base class] B that cannot be [copied] because overload 3718 // resolution, as applied to B's [copy] assignment operator, results in 3719 // an ambiguity or a function that is deleted or inaccessible from the 3720 // assignment operator 3721 3722 LookupQualifiedName(R, BaseDecl, false); 3723 3724 // Filter out any result that isn't a copy-assignment operator. 3725 LookupResult::Filter F = R.makeFilter(); 3726 while (F.hasNext()) { 3727 NamedDecl *D = F.next(); 3728 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3729 if (Method->isCopyAssignmentOperator()) 3730 continue; 3731 3732 F.erase(); 3733 } 3734 F.done(); 3735 3736 // Build a fake argument expression 3737 QualType ArgType = BaseType; 3738 QualType ThisType = BaseType; 3739 if (ConstArg) 3740 ArgType.addConst(); 3741 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3742 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3743 }; 3744 3745 OverloadCandidateSet OCS((Loc)); 3746 OverloadCandidateSet::iterator Best; 3747 3748 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3749 3750 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3751 OR_Success) 3752 return true; 3753 } 3754 3755 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3756 FE = RD->field_end(); 3757 FI != FE; ++FI) { 3758 QualType FieldType = Context.getBaseElementType(FI->getType()); 3759 3760 // -- a non-static data member of reference type 3761 if (FieldType->isReferenceType()) 3762 return true; 3763 3764 // -- a non-static data member of const non-class type (or array thereof) 3765 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3766 return true; 3767 3768 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3769 3770 if (FieldRecord) { 3771 // This is an anonymous union 3772 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3773 // Anonymous unions inside unions do not variant members create 3774 if (!Union) { 3775 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3776 UE = FieldRecord->field_end(); 3777 UI != UE; ++UI) { 3778 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3779 CXXRecordDecl *UnionFieldRecord = 3780 UnionFieldType->getAsCXXRecordDecl(); 3781 3782 // -- a variant member with a non-trivial [copy] assignment operator 3783 // and X is a union-like class 3784 if (UnionFieldRecord && 3785 !UnionFieldRecord->hasTrivialCopyAssignment()) 3786 return true; 3787 } 3788 } 3789 3790 // Don't try to initalize an anonymous union 3791 continue; 3792 // -- a variant member with a non-trivial [copy] assignment operator 3793 // and X is a union-like class 3794 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3795 return true; 3796 } 3797 3798 LookupQualifiedName(R, FieldRecord, false); 3799 3800 // Filter out any result that isn't a copy-assignment operator. 3801 LookupResult::Filter F = R.makeFilter(); 3802 while (F.hasNext()) { 3803 NamedDecl *D = F.next(); 3804 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 3805 if (Method->isCopyAssignmentOperator()) 3806 continue; 3807 3808 F.erase(); 3809 } 3810 F.done(); 3811 3812 // Build a fake argument expression 3813 QualType ArgType = FieldType; 3814 QualType ThisType = FieldType; 3815 if (ConstArg) 3816 ArgType.addConst(); 3817 Expr *Args[] = { new (Context) OpaqueValueExpr(Loc, ThisType, VK_LValue) 3818 , new (Context) OpaqueValueExpr(Loc, ArgType, VK_LValue) 3819 }; 3820 3821 OverloadCandidateSet OCS((Loc)); 3822 OverloadCandidateSet::iterator Best; 3823 3824 AddFunctionCandidates(R.asUnresolvedSet(), Args, 2, OCS); 3825 3826 if (OCS.BestViableFunction(*this, Loc, Best, false) != 3827 OR_Success) 3828 return true; 3829 } 3830 } 3831 3832 return false; 3833} 3834 3835bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3836 CXXRecordDecl *RD = DD->getParent(); 3837 assert(!RD->isDependentType() && "do deletion after instantiation"); 3838 if (!LangOpts.CPlusPlus0x) 3839 return false; 3840 3841 SourceLocation Loc = DD->getLocation(); 3842 3843 // Do access control from the destructor 3844 ContextRAII CtorContext(*this, DD); 3845 3846 bool Union = RD->isUnion(); 3847 3848 // We do this because we should never actually use an anonymous 3849 // union's destructor. 3850 if (Union && RD->isAnonymousStructOrUnion()) 3851 return false; 3852 3853 // C++0x [class.dtor]p5 3854 // A defaulted destructor for a class X is defined as deleted if: 3855 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3856 BE = RD->bases_end(); 3857 BI != BE; ++BI) { 3858 // We'll handle this one later 3859 if (BI->isVirtual()) 3860 continue; 3861 3862 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3863 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3864 assert(BaseDtor && "base has no destructor"); 3865 3866 // -- any direct or virtual base class has a deleted destructor or 3867 // a destructor that is inaccessible from the defaulted destructor 3868 if (BaseDtor->isDeleted()) 3869 return true; 3870 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3871 AR_accessible) 3872 return true; 3873 } 3874 3875 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3876 BE = RD->vbases_end(); 3877 BI != BE; ++BI) { 3878 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3879 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3880 assert(BaseDtor && "base has no destructor"); 3881 3882 // -- any direct or virtual base class has a deleted destructor or 3883 // a destructor that is inaccessible from the defaulted destructor 3884 if (BaseDtor->isDeleted()) 3885 return true; 3886 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3887 AR_accessible) 3888 return true; 3889 } 3890 3891 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3892 FE = RD->field_end(); 3893 FI != FE; ++FI) { 3894 QualType FieldType = Context.getBaseElementType(FI->getType()); 3895 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3896 if (FieldRecord) { 3897 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3898 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3899 UE = FieldRecord->field_end(); 3900 UI != UE; ++UI) { 3901 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3902 CXXRecordDecl *UnionFieldRecord = 3903 UnionFieldType->getAsCXXRecordDecl(); 3904 3905 // -- X is a union-like class that has a variant member with a non- 3906 // trivial destructor. 3907 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3908 return true; 3909 } 3910 // Technically we are supposed to do this next check unconditionally. 3911 // But that makes absolutely no sense. 3912 } else { 3913 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3914 3915 // -- any of the non-static data members has class type M (or array 3916 // thereof) and M has a deleted destructor or a destructor that is 3917 // inaccessible from the defaulted destructor 3918 if (FieldDtor->isDeleted()) 3919 return true; 3920 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3921 AR_accessible) 3922 return true; 3923 3924 // -- X is a union-like class that has a variant member with a non- 3925 // trivial destructor. 3926 if (Union && !FieldDtor->isTrivial()) 3927 return true; 3928 } 3929 } 3930 } 3931 3932 if (DD->isVirtual()) { 3933 FunctionDecl *OperatorDelete = 0; 3934 DeclarationName Name = 3935 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3936 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3937 false)) 3938 return true; 3939 } 3940 3941 3942 return false; 3943} 3944 3945/// \brief Data used with FindHiddenVirtualMethod 3946namespace { 3947 struct FindHiddenVirtualMethodData { 3948 Sema *S; 3949 CXXMethodDecl *Method; 3950 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3951 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3952 }; 3953} 3954 3955/// \brief Member lookup function that determines whether a given C++ 3956/// method overloads virtual methods in a base class without overriding any, 3957/// to be used with CXXRecordDecl::lookupInBases(). 3958static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3959 CXXBasePath &Path, 3960 void *UserData) { 3961 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3962 3963 FindHiddenVirtualMethodData &Data 3964 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3965 3966 DeclarationName Name = Data.Method->getDeclName(); 3967 assert(Name.getNameKind() == DeclarationName::Identifier); 3968 3969 bool foundSameNameMethod = false; 3970 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3971 for (Path.Decls = BaseRecord->lookup(Name); 3972 Path.Decls.first != Path.Decls.second; 3973 ++Path.Decls.first) { 3974 NamedDecl *D = *Path.Decls.first; 3975 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3976 MD = MD->getCanonicalDecl(); 3977 foundSameNameMethod = true; 3978 // Interested only in hidden virtual methods. 3979 if (!MD->isVirtual()) 3980 continue; 3981 // If the method we are checking overrides a method from its base 3982 // don't warn about the other overloaded methods. 3983 if (!Data.S->IsOverload(Data.Method, MD, false)) 3984 return true; 3985 // Collect the overload only if its hidden. 3986 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3987 overloadedMethods.push_back(MD); 3988 } 3989 } 3990 3991 if (foundSameNameMethod) 3992 Data.OverloadedMethods.append(overloadedMethods.begin(), 3993 overloadedMethods.end()); 3994 return foundSameNameMethod; 3995} 3996 3997/// \brief See if a method overloads virtual methods in a base class without 3998/// overriding any. 3999void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4000 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4001 MD->getLocation()) == Diagnostic::Ignored) 4002 return; 4003 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4004 return; 4005 4006 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4007 /*bool RecordPaths=*/false, 4008 /*bool DetectVirtual=*/false); 4009 FindHiddenVirtualMethodData Data; 4010 Data.Method = MD; 4011 Data.S = this; 4012 4013 // Keep the base methods that were overriden or introduced in the subclass 4014 // by 'using' in a set. A base method not in this set is hidden. 4015 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4016 res.first != res.second; ++res.first) { 4017 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4018 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4019 E = MD->end_overridden_methods(); 4020 I != E; ++I) 4021 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4022 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4023 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4024 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4025 } 4026 4027 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4028 !Data.OverloadedMethods.empty()) { 4029 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4030 << MD << (Data.OverloadedMethods.size() > 1); 4031 4032 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4033 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4034 Diag(overloadedMD->getLocation(), 4035 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4036 } 4037 } 4038} 4039 4040void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4041 Decl *TagDecl, 4042 SourceLocation LBrac, 4043 SourceLocation RBrac, 4044 AttributeList *AttrList) { 4045 if (!TagDecl) 4046 return; 4047 4048 AdjustDeclIfTemplate(TagDecl); 4049 4050 ActOnFields(S, RLoc, TagDecl, 4051 // strict aliasing violation! 4052 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4053 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4054 4055 CheckCompletedCXXClass( 4056 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4057} 4058 4059/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4060/// special functions, such as the default constructor, copy 4061/// constructor, or destructor, to the given C++ class (C++ 4062/// [special]p1). This routine can only be executed just before the 4063/// definition of the class is complete. 4064void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4065 if (!ClassDecl->hasUserDeclaredConstructor()) 4066 ++ASTContext::NumImplicitDefaultConstructors; 4067 4068 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4069 ++ASTContext::NumImplicitCopyConstructors; 4070 4071 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4072 ++ASTContext::NumImplicitCopyAssignmentOperators; 4073 4074 // If we have a dynamic class, then the copy assignment operator may be 4075 // virtual, so we have to declare it immediately. This ensures that, e.g., 4076 // it shows up in the right place in the vtable and that we diagnose 4077 // problems with the implicit exception specification. 4078 if (ClassDecl->isDynamicClass()) 4079 DeclareImplicitCopyAssignment(ClassDecl); 4080 } 4081 4082 if (!ClassDecl->hasUserDeclaredDestructor()) { 4083 ++ASTContext::NumImplicitDestructors; 4084 4085 // If we have a dynamic class, then the destructor may be virtual, so we 4086 // have to declare the destructor immediately. This ensures that, e.g., it 4087 // shows up in the right place in the vtable and that we diagnose problems 4088 // with the implicit exception specification. 4089 if (ClassDecl->isDynamicClass()) 4090 DeclareImplicitDestructor(ClassDecl); 4091 } 4092} 4093 4094void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4095 if (!D) 4096 return; 4097 4098 int NumParamList = D->getNumTemplateParameterLists(); 4099 for (int i = 0; i < NumParamList; i++) { 4100 TemplateParameterList* Params = D->getTemplateParameterList(i); 4101 for (TemplateParameterList::iterator Param = Params->begin(), 4102 ParamEnd = Params->end(); 4103 Param != ParamEnd; ++Param) { 4104 NamedDecl *Named = cast<NamedDecl>(*Param); 4105 if (Named->getDeclName()) { 4106 S->AddDecl(Named); 4107 IdResolver.AddDecl(Named); 4108 } 4109 } 4110 } 4111} 4112 4113void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4114 if (!D) 4115 return; 4116 4117 TemplateParameterList *Params = 0; 4118 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4119 Params = Template->getTemplateParameters(); 4120 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4121 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4122 Params = PartialSpec->getTemplateParameters(); 4123 else 4124 return; 4125 4126 for (TemplateParameterList::iterator Param = Params->begin(), 4127 ParamEnd = Params->end(); 4128 Param != ParamEnd; ++Param) { 4129 NamedDecl *Named = cast<NamedDecl>(*Param); 4130 if (Named->getDeclName()) { 4131 S->AddDecl(Named); 4132 IdResolver.AddDecl(Named); 4133 } 4134 } 4135} 4136 4137void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4138 if (!RecordD) return; 4139 AdjustDeclIfTemplate(RecordD); 4140 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4141 PushDeclContext(S, Record); 4142} 4143 4144void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4145 if (!RecordD) return; 4146 PopDeclContext(); 4147} 4148 4149/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4150/// parsing a top-level (non-nested) C++ class, and we are now 4151/// parsing those parts of the given Method declaration that could 4152/// not be parsed earlier (C++ [class.mem]p2), such as default 4153/// arguments. This action should enter the scope of the given 4154/// Method declaration as if we had just parsed the qualified method 4155/// name. However, it should not bring the parameters into scope; 4156/// that will be performed by ActOnDelayedCXXMethodParameter. 4157void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4158} 4159 4160/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4161/// C++ method declaration. We're (re-)introducing the given 4162/// function parameter into scope for use in parsing later parts of 4163/// the method declaration. For example, we could see an 4164/// ActOnParamDefaultArgument event for this parameter. 4165void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4166 if (!ParamD) 4167 return; 4168 4169 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4170 4171 // If this parameter has an unparsed default argument, clear it out 4172 // to make way for the parsed default argument. 4173 if (Param->hasUnparsedDefaultArg()) 4174 Param->setDefaultArg(0); 4175 4176 S->AddDecl(Param); 4177 if (Param->getDeclName()) 4178 IdResolver.AddDecl(Param); 4179} 4180 4181/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4182/// processing the delayed method declaration for Method. The method 4183/// declaration is now considered finished. There may be a separate 4184/// ActOnStartOfFunctionDef action later (not necessarily 4185/// immediately!) for this method, if it was also defined inside the 4186/// class body. 4187void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4188 if (!MethodD) 4189 return; 4190 4191 AdjustDeclIfTemplate(MethodD); 4192 4193 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4194 4195 // Now that we have our default arguments, check the constructor 4196 // again. It could produce additional diagnostics or affect whether 4197 // the class has implicitly-declared destructors, among other 4198 // things. 4199 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4200 CheckConstructor(Constructor); 4201 4202 // Check the default arguments, which we may have added. 4203 if (!Method->isInvalidDecl()) 4204 CheckCXXDefaultArguments(Method); 4205} 4206 4207/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4208/// the well-formedness of the constructor declarator @p D with type @p 4209/// R. If there are any errors in the declarator, this routine will 4210/// emit diagnostics and set the invalid bit to true. In any case, the type 4211/// will be updated to reflect a well-formed type for the constructor and 4212/// returned. 4213QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4214 StorageClass &SC) { 4215 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4216 4217 // C++ [class.ctor]p3: 4218 // A constructor shall not be virtual (10.3) or static (9.4). A 4219 // constructor can be invoked for a const, volatile or const 4220 // volatile object. A constructor shall not be declared const, 4221 // volatile, or const volatile (9.3.2). 4222 if (isVirtual) { 4223 if (!D.isInvalidType()) 4224 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4225 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4226 << SourceRange(D.getIdentifierLoc()); 4227 D.setInvalidType(); 4228 } 4229 if (SC == SC_Static) { 4230 if (!D.isInvalidType()) 4231 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4232 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4233 << SourceRange(D.getIdentifierLoc()); 4234 D.setInvalidType(); 4235 SC = SC_None; 4236 } 4237 4238 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4239 if (FTI.TypeQuals != 0) { 4240 if (FTI.TypeQuals & Qualifiers::Const) 4241 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4242 << "const" << SourceRange(D.getIdentifierLoc()); 4243 if (FTI.TypeQuals & Qualifiers::Volatile) 4244 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4245 << "volatile" << SourceRange(D.getIdentifierLoc()); 4246 if (FTI.TypeQuals & Qualifiers::Restrict) 4247 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4248 << "restrict" << SourceRange(D.getIdentifierLoc()); 4249 D.setInvalidType(); 4250 } 4251 4252 // C++0x [class.ctor]p4: 4253 // A constructor shall not be declared with a ref-qualifier. 4254 if (FTI.hasRefQualifier()) { 4255 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4256 << FTI.RefQualifierIsLValueRef 4257 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4258 D.setInvalidType(); 4259 } 4260 4261 // Rebuild the function type "R" without any type qualifiers (in 4262 // case any of the errors above fired) and with "void" as the 4263 // return type, since constructors don't have return types. 4264 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4265 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4266 return R; 4267 4268 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4269 EPI.TypeQuals = 0; 4270 EPI.RefQualifier = RQ_None; 4271 4272 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4273 Proto->getNumArgs(), EPI); 4274} 4275 4276/// CheckConstructor - Checks a fully-formed constructor for 4277/// well-formedness, issuing any diagnostics required. Returns true if 4278/// the constructor declarator is invalid. 4279void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4280 CXXRecordDecl *ClassDecl 4281 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4282 if (!ClassDecl) 4283 return Constructor->setInvalidDecl(); 4284 4285 // C++ [class.copy]p3: 4286 // A declaration of a constructor for a class X is ill-formed if 4287 // its first parameter is of type (optionally cv-qualified) X and 4288 // either there are no other parameters or else all other 4289 // parameters have default arguments. 4290 if (!Constructor->isInvalidDecl() && 4291 ((Constructor->getNumParams() == 1) || 4292 (Constructor->getNumParams() > 1 && 4293 Constructor->getParamDecl(1)->hasDefaultArg())) && 4294 Constructor->getTemplateSpecializationKind() 4295 != TSK_ImplicitInstantiation) { 4296 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4297 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4298 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4299 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4300 const char *ConstRef 4301 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4302 : " const &"; 4303 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4304 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4305 4306 // FIXME: Rather that making the constructor invalid, we should endeavor 4307 // to fix the type. 4308 Constructor->setInvalidDecl(); 4309 } 4310 } 4311} 4312 4313/// CheckDestructor - Checks a fully-formed destructor definition for 4314/// well-formedness, issuing any diagnostics required. Returns true 4315/// on error. 4316bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4317 CXXRecordDecl *RD = Destructor->getParent(); 4318 4319 if (Destructor->isVirtual()) { 4320 SourceLocation Loc; 4321 4322 if (!Destructor->isImplicit()) 4323 Loc = Destructor->getLocation(); 4324 else 4325 Loc = RD->getLocation(); 4326 4327 // If we have a virtual destructor, look up the deallocation function 4328 FunctionDecl *OperatorDelete = 0; 4329 DeclarationName Name = 4330 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4331 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4332 return true; 4333 4334 MarkDeclarationReferenced(Loc, OperatorDelete); 4335 4336 Destructor->setOperatorDelete(OperatorDelete); 4337 } 4338 4339 return false; 4340} 4341 4342static inline bool 4343FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4344 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4345 FTI.ArgInfo[0].Param && 4346 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4347} 4348 4349/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4350/// the well-formednes of the destructor declarator @p D with type @p 4351/// R. If there are any errors in the declarator, this routine will 4352/// emit diagnostics and set the declarator to invalid. Even if this happens, 4353/// will be updated to reflect a well-formed type for the destructor and 4354/// returned. 4355QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4356 StorageClass& SC) { 4357 // C++ [class.dtor]p1: 4358 // [...] A typedef-name that names a class is a class-name 4359 // (7.1.3); however, a typedef-name that names a class shall not 4360 // be used as the identifier in the declarator for a destructor 4361 // declaration. 4362 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4363 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4364 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4365 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4366 else if (const TemplateSpecializationType *TST = 4367 DeclaratorType->getAs<TemplateSpecializationType>()) 4368 if (TST->isTypeAlias()) 4369 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4370 << DeclaratorType << 1; 4371 4372 // C++ [class.dtor]p2: 4373 // A destructor is used to destroy objects of its class type. A 4374 // destructor takes no parameters, and no return type can be 4375 // specified for it (not even void). The address of a destructor 4376 // shall not be taken. A destructor shall not be static. A 4377 // destructor can be invoked for a const, volatile or const 4378 // volatile object. A destructor shall not be declared const, 4379 // volatile or const volatile (9.3.2). 4380 if (SC == SC_Static) { 4381 if (!D.isInvalidType()) 4382 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4383 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4384 << SourceRange(D.getIdentifierLoc()) 4385 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4386 4387 SC = SC_None; 4388 } 4389 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4390 // Destructors don't have return types, but the parser will 4391 // happily parse something like: 4392 // 4393 // class X { 4394 // float ~X(); 4395 // }; 4396 // 4397 // The return type will be eliminated later. 4398 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4399 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4400 << SourceRange(D.getIdentifierLoc()); 4401 } 4402 4403 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4404 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4405 if (FTI.TypeQuals & Qualifiers::Const) 4406 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4407 << "const" << SourceRange(D.getIdentifierLoc()); 4408 if (FTI.TypeQuals & Qualifiers::Volatile) 4409 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4410 << "volatile" << SourceRange(D.getIdentifierLoc()); 4411 if (FTI.TypeQuals & Qualifiers::Restrict) 4412 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4413 << "restrict" << SourceRange(D.getIdentifierLoc()); 4414 D.setInvalidType(); 4415 } 4416 4417 // C++0x [class.dtor]p2: 4418 // A destructor shall not be declared with a ref-qualifier. 4419 if (FTI.hasRefQualifier()) { 4420 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4421 << FTI.RefQualifierIsLValueRef 4422 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4423 D.setInvalidType(); 4424 } 4425 4426 // Make sure we don't have any parameters. 4427 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4428 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4429 4430 // Delete the parameters. 4431 FTI.freeArgs(); 4432 D.setInvalidType(); 4433 } 4434 4435 // Make sure the destructor isn't variadic. 4436 if (FTI.isVariadic) { 4437 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4438 D.setInvalidType(); 4439 } 4440 4441 // Rebuild the function type "R" without any type qualifiers or 4442 // parameters (in case any of the errors above fired) and with 4443 // "void" as the return type, since destructors don't have return 4444 // types. 4445 if (!D.isInvalidType()) 4446 return R; 4447 4448 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4449 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4450 EPI.Variadic = false; 4451 EPI.TypeQuals = 0; 4452 EPI.RefQualifier = RQ_None; 4453 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4454} 4455 4456/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4457/// well-formednes of the conversion function declarator @p D with 4458/// type @p R. If there are any errors in the declarator, this routine 4459/// will emit diagnostics and return true. Otherwise, it will return 4460/// false. Either way, the type @p R will be updated to reflect a 4461/// well-formed type for the conversion operator. 4462void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4463 StorageClass& SC) { 4464 // C++ [class.conv.fct]p1: 4465 // Neither parameter types nor return type can be specified. The 4466 // type of a conversion function (8.3.5) is "function taking no 4467 // parameter returning conversion-type-id." 4468 if (SC == SC_Static) { 4469 if (!D.isInvalidType()) 4470 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4471 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4472 << SourceRange(D.getIdentifierLoc()); 4473 D.setInvalidType(); 4474 SC = SC_None; 4475 } 4476 4477 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4478 4479 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4480 // Conversion functions don't have return types, but the parser will 4481 // happily parse something like: 4482 // 4483 // class X { 4484 // float operator bool(); 4485 // }; 4486 // 4487 // The return type will be changed later anyway. 4488 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4489 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4490 << SourceRange(D.getIdentifierLoc()); 4491 D.setInvalidType(); 4492 } 4493 4494 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4495 4496 // Make sure we don't have any parameters. 4497 if (Proto->getNumArgs() > 0) { 4498 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4499 4500 // Delete the parameters. 4501 D.getFunctionTypeInfo().freeArgs(); 4502 D.setInvalidType(); 4503 } else if (Proto->isVariadic()) { 4504 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4505 D.setInvalidType(); 4506 } 4507 4508 // Diagnose "&operator bool()" and other such nonsense. This 4509 // is actually a gcc extension which we don't support. 4510 if (Proto->getResultType() != ConvType) { 4511 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4512 << Proto->getResultType(); 4513 D.setInvalidType(); 4514 ConvType = Proto->getResultType(); 4515 } 4516 4517 // C++ [class.conv.fct]p4: 4518 // The conversion-type-id shall not represent a function type nor 4519 // an array type. 4520 if (ConvType->isArrayType()) { 4521 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4522 ConvType = Context.getPointerType(ConvType); 4523 D.setInvalidType(); 4524 } else if (ConvType->isFunctionType()) { 4525 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4526 ConvType = Context.getPointerType(ConvType); 4527 D.setInvalidType(); 4528 } 4529 4530 // Rebuild the function type "R" without any parameters (in case any 4531 // of the errors above fired) and with the conversion type as the 4532 // return type. 4533 if (D.isInvalidType()) 4534 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4535 4536 // C++0x explicit conversion operators. 4537 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4538 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4539 diag::warn_explicit_conversion_functions) 4540 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4541} 4542 4543/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4544/// the declaration of the given C++ conversion function. This routine 4545/// is responsible for recording the conversion function in the C++ 4546/// class, if possible. 4547Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4548 assert(Conversion && "Expected to receive a conversion function declaration"); 4549 4550 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4551 4552 // Make sure we aren't redeclaring the conversion function. 4553 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4554 4555 // C++ [class.conv.fct]p1: 4556 // [...] A conversion function is never used to convert a 4557 // (possibly cv-qualified) object to the (possibly cv-qualified) 4558 // same object type (or a reference to it), to a (possibly 4559 // cv-qualified) base class of that type (or a reference to it), 4560 // or to (possibly cv-qualified) void. 4561 // FIXME: Suppress this warning if the conversion function ends up being a 4562 // virtual function that overrides a virtual function in a base class. 4563 QualType ClassType 4564 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4565 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4566 ConvType = ConvTypeRef->getPointeeType(); 4567 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4568 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4569 /* Suppress diagnostics for instantiations. */; 4570 else if (ConvType->isRecordType()) { 4571 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4572 if (ConvType == ClassType) 4573 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4574 << ClassType; 4575 else if (IsDerivedFrom(ClassType, ConvType)) 4576 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4577 << ClassType << ConvType; 4578 } else if (ConvType->isVoidType()) { 4579 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4580 << ClassType << ConvType; 4581 } 4582 4583 if (FunctionTemplateDecl *ConversionTemplate 4584 = Conversion->getDescribedFunctionTemplate()) 4585 return ConversionTemplate; 4586 4587 return Conversion; 4588} 4589 4590//===----------------------------------------------------------------------===// 4591// Namespace Handling 4592//===----------------------------------------------------------------------===// 4593 4594 4595 4596/// ActOnStartNamespaceDef - This is called at the start of a namespace 4597/// definition. 4598Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4599 SourceLocation InlineLoc, 4600 SourceLocation NamespaceLoc, 4601 SourceLocation IdentLoc, 4602 IdentifierInfo *II, 4603 SourceLocation LBrace, 4604 AttributeList *AttrList) { 4605 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4606 // For anonymous namespace, take the location of the left brace. 4607 SourceLocation Loc = II ? IdentLoc : LBrace; 4608 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4609 StartLoc, Loc, II); 4610 Namespc->setInline(InlineLoc.isValid()); 4611 4612 Scope *DeclRegionScope = NamespcScope->getParent(); 4613 4614 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4615 4616 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4617 PushNamespaceVisibilityAttr(Attr); 4618 4619 if (II) { 4620 // C++ [namespace.def]p2: 4621 // The identifier in an original-namespace-definition shall not 4622 // have been previously defined in the declarative region in 4623 // which the original-namespace-definition appears. The 4624 // identifier in an original-namespace-definition is the name of 4625 // the namespace. Subsequently in that declarative region, it is 4626 // treated as an original-namespace-name. 4627 // 4628 // Since namespace names are unique in their scope, and we don't 4629 // look through using directives, just look for any ordinary names. 4630 4631 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4632 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4633 Decl::IDNS_Namespace; 4634 NamedDecl *PrevDecl = 0; 4635 for (DeclContext::lookup_result R 4636 = CurContext->getRedeclContext()->lookup(II); 4637 R.first != R.second; ++R.first) { 4638 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4639 PrevDecl = *R.first; 4640 break; 4641 } 4642 } 4643 4644 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4645 // This is an extended namespace definition. 4646 if (Namespc->isInline() != OrigNS->isInline()) { 4647 // inline-ness must match 4648 if (OrigNS->isInline()) { 4649 // The user probably just forgot the 'inline', so suggest that it 4650 // be added back. 4651 Diag(Namespc->getLocation(), 4652 diag::warn_inline_namespace_reopened_noninline) 4653 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4654 } else { 4655 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4656 << Namespc->isInline(); 4657 } 4658 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4659 4660 // Recover by ignoring the new namespace's inline status. 4661 Namespc->setInline(OrigNS->isInline()); 4662 } 4663 4664 // Attach this namespace decl to the chain of extended namespace 4665 // definitions. 4666 OrigNS->setNextNamespace(Namespc); 4667 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4668 4669 // Remove the previous declaration from the scope. 4670 if (DeclRegionScope->isDeclScope(OrigNS)) { 4671 IdResolver.RemoveDecl(OrigNS); 4672 DeclRegionScope->RemoveDecl(OrigNS); 4673 } 4674 } else if (PrevDecl) { 4675 // This is an invalid name redefinition. 4676 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4677 << Namespc->getDeclName(); 4678 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4679 Namespc->setInvalidDecl(); 4680 // Continue on to push Namespc as current DeclContext and return it. 4681 } else if (II->isStr("std") && 4682 CurContext->getRedeclContext()->isTranslationUnit()) { 4683 // This is the first "real" definition of the namespace "std", so update 4684 // our cache of the "std" namespace to point at this definition. 4685 if (NamespaceDecl *StdNS = getStdNamespace()) { 4686 // We had already defined a dummy namespace "std". Link this new 4687 // namespace definition to the dummy namespace "std". 4688 StdNS->setNextNamespace(Namespc); 4689 StdNS->setLocation(IdentLoc); 4690 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4691 } 4692 4693 // Make our StdNamespace cache point at the first real definition of the 4694 // "std" namespace. 4695 StdNamespace = Namespc; 4696 } 4697 4698 PushOnScopeChains(Namespc, DeclRegionScope); 4699 } else { 4700 // Anonymous namespaces. 4701 assert(Namespc->isAnonymousNamespace()); 4702 4703 // Link the anonymous namespace into its parent. 4704 NamespaceDecl *PrevDecl; 4705 DeclContext *Parent = CurContext->getRedeclContext(); 4706 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4707 PrevDecl = TU->getAnonymousNamespace(); 4708 TU->setAnonymousNamespace(Namespc); 4709 } else { 4710 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4711 PrevDecl = ND->getAnonymousNamespace(); 4712 ND->setAnonymousNamespace(Namespc); 4713 } 4714 4715 // Link the anonymous namespace with its previous declaration. 4716 if (PrevDecl) { 4717 assert(PrevDecl->isAnonymousNamespace()); 4718 assert(!PrevDecl->getNextNamespace()); 4719 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4720 PrevDecl->setNextNamespace(Namespc); 4721 4722 if (Namespc->isInline() != PrevDecl->isInline()) { 4723 // inline-ness must match 4724 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4725 << Namespc->isInline(); 4726 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4727 Namespc->setInvalidDecl(); 4728 // Recover by ignoring the new namespace's inline status. 4729 Namespc->setInline(PrevDecl->isInline()); 4730 } 4731 } 4732 4733 CurContext->addDecl(Namespc); 4734 4735 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4736 // behaves as if it were replaced by 4737 // namespace unique { /* empty body */ } 4738 // using namespace unique; 4739 // namespace unique { namespace-body } 4740 // where all occurrences of 'unique' in a translation unit are 4741 // replaced by the same identifier and this identifier differs 4742 // from all other identifiers in the entire program. 4743 4744 // We just create the namespace with an empty name and then add an 4745 // implicit using declaration, just like the standard suggests. 4746 // 4747 // CodeGen enforces the "universally unique" aspect by giving all 4748 // declarations semantically contained within an anonymous 4749 // namespace internal linkage. 4750 4751 if (!PrevDecl) { 4752 UsingDirectiveDecl* UD 4753 = UsingDirectiveDecl::Create(Context, CurContext, 4754 /* 'using' */ LBrace, 4755 /* 'namespace' */ SourceLocation(), 4756 /* qualifier */ NestedNameSpecifierLoc(), 4757 /* identifier */ SourceLocation(), 4758 Namespc, 4759 /* Ancestor */ CurContext); 4760 UD->setImplicit(); 4761 CurContext->addDecl(UD); 4762 } 4763 } 4764 4765 // Although we could have an invalid decl (i.e. the namespace name is a 4766 // redefinition), push it as current DeclContext and try to continue parsing. 4767 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4768 // for the namespace has the declarations that showed up in that particular 4769 // namespace definition. 4770 PushDeclContext(NamespcScope, Namespc); 4771 return Namespc; 4772} 4773 4774/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4775/// is a namespace alias, returns the namespace it points to. 4776static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4777 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4778 return AD->getNamespace(); 4779 return dyn_cast_or_null<NamespaceDecl>(D); 4780} 4781 4782/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4783/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4784void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4785 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4786 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4787 Namespc->setRBraceLoc(RBrace); 4788 PopDeclContext(); 4789 if (Namespc->hasAttr<VisibilityAttr>()) 4790 PopPragmaVisibility(); 4791} 4792 4793CXXRecordDecl *Sema::getStdBadAlloc() const { 4794 return cast_or_null<CXXRecordDecl>( 4795 StdBadAlloc.get(Context.getExternalSource())); 4796} 4797 4798NamespaceDecl *Sema::getStdNamespace() const { 4799 return cast_or_null<NamespaceDecl>( 4800 StdNamespace.get(Context.getExternalSource())); 4801} 4802 4803/// \brief Retrieve the special "std" namespace, which may require us to 4804/// implicitly define the namespace. 4805NamespaceDecl *Sema::getOrCreateStdNamespace() { 4806 if (!StdNamespace) { 4807 // The "std" namespace has not yet been defined, so build one implicitly. 4808 StdNamespace = NamespaceDecl::Create(Context, 4809 Context.getTranslationUnitDecl(), 4810 SourceLocation(), SourceLocation(), 4811 &PP.getIdentifierTable().get("std")); 4812 getStdNamespace()->setImplicit(true); 4813 } 4814 4815 return getStdNamespace(); 4816} 4817 4818/// \brief Determine whether a using statement is in a context where it will be 4819/// apply in all contexts. 4820static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4821 switch (CurContext->getDeclKind()) { 4822 case Decl::TranslationUnit: 4823 return true; 4824 case Decl::LinkageSpec: 4825 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4826 default: 4827 return false; 4828 } 4829} 4830 4831Decl *Sema::ActOnUsingDirective(Scope *S, 4832 SourceLocation UsingLoc, 4833 SourceLocation NamespcLoc, 4834 CXXScopeSpec &SS, 4835 SourceLocation IdentLoc, 4836 IdentifierInfo *NamespcName, 4837 AttributeList *AttrList) { 4838 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4839 assert(NamespcName && "Invalid NamespcName."); 4840 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4841 4842 // This can only happen along a recovery path. 4843 while (S->getFlags() & Scope::TemplateParamScope) 4844 S = S->getParent(); 4845 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4846 4847 UsingDirectiveDecl *UDir = 0; 4848 NestedNameSpecifier *Qualifier = 0; 4849 if (SS.isSet()) 4850 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4851 4852 // Lookup namespace name. 4853 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4854 LookupParsedName(R, S, &SS); 4855 if (R.isAmbiguous()) 4856 return 0; 4857 4858 if (R.empty()) { 4859 // Allow "using namespace std;" or "using namespace ::std;" even if 4860 // "std" hasn't been defined yet, for GCC compatibility. 4861 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4862 NamespcName->isStr("std")) { 4863 Diag(IdentLoc, diag::ext_using_undefined_std); 4864 R.addDecl(getOrCreateStdNamespace()); 4865 R.resolveKind(); 4866 } 4867 // Otherwise, attempt typo correction. 4868 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4869 CTC_NoKeywords, 0)) { 4870 if (R.getAsSingle<NamespaceDecl>() || 4871 R.getAsSingle<NamespaceAliasDecl>()) { 4872 if (DeclContext *DC = computeDeclContext(SS, false)) 4873 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4874 << NamespcName << DC << Corrected << SS.getRange() 4875 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4876 else 4877 Diag(IdentLoc, diag::err_using_directive_suggest) 4878 << NamespcName << Corrected 4879 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4880 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4881 << Corrected; 4882 4883 NamespcName = Corrected.getAsIdentifierInfo(); 4884 } else { 4885 R.clear(); 4886 R.setLookupName(NamespcName); 4887 } 4888 } 4889 } 4890 4891 if (!R.empty()) { 4892 NamedDecl *Named = R.getFoundDecl(); 4893 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4894 && "expected namespace decl"); 4895 // C++ [namespace.udir]p1: 4896 // A using-directive specifies that the names in the nominated 4897 // namespace can be used in the scope in which the 4898 // using-directive appears after the using-directive. During 4899 // unqualified name lookup (3.4.1), the names appear as if they 4900 // were declared in the nearest enclosing namespace which 4901 // contains both the using-directive and the nominated 4902 // namespace. [Note: in this context, "contains" means "contains 4903 // directly or indirectly". ] 4904 4905 // Find enclosing context containing both using-directive and 4906 // nominated namespace. 4907 NamespaceDecl *NS = getNamespaceDecl(Named); 4908 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4909 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4910 CommonAncestor = CommonAncestor->getParent(); 4911 4912 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4913 SS.getWithLocInContext(Context), 4914 IdentLoc, Named, CommonAncestor); 4915 4916 if (IsUsingDirectiveInToplevelContext(CurContext) && 4917 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4918 Diag(IdentLoc, diag::warn_using_directive_in_header); 4919 } 4920 4921 PushUsingDirective(S, UDir); 4922 } else { 4923 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4924 } 4925 4926 // FIXME: We ignore attributes for now. 4927 return UDir; 4928} 4929 4930void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4931 // If scope has associated entity, then using directive is at namespace 4932 // or translation unit scope. We add UsingDirectiveDecls, into 4933 // it's lookup structure. 4934 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4935 Ctx->addDecl(UDir); 4936 else 4937 // Otherwise it is block-sope. using-directives will affect lookup 4938 // only to the end of scope. 4939 S->PushUsingDirective(UDir); 4940} 4941 4942 4943Decl *Sema::ActOnUsingDeclaration(Scope *S, 4944 AccessSpecifier AS, 4945 bool HasUsingKeyword, 4946 SourceLocation UsingLoc, 4947 CXXScopeSpec &SS, 4948 UnqualifiedId &Name, 4949 AttributeList *AttrList, 4950 bool IsTypeName, 4951 SourceLocation TypenameLoc) { 4952 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4953 4954 switch (Name.getKind()) { 4955 case UnqualifiedId::IK_Identifier: 4956 case UnqualifiedId::IK_OperatorFunctionId: 4957 case UnqualifiedId::IK_LiteralOperatorId: 4958 case UnqualifiedId::IK_ConversionFunctionId: 4959 break; 4960 4961 case UnqualifiedId::IK_ConstructorName: 4962 case UnqualifiedId::IK_ConstructorTemplateId: 4963 // C++0x inherited constructors. 4964 if (getLangOptions().CPlusPlus0x) break; 4965 4966 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4967 << SS.getRange(); 4968 return 0; 4969 4970 case UnqualifiedId::IK_DestructorName: 4971 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4972 << SS.getRange(); 4973 return 0; 4974 4975 case UnqualifiedId::IK_TemplateId: 4976 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4977 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4978 return 0; 4979 } 4980 4981 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4982 DeclarationName TargetName = TargetNameInfo.getName(); 4983 if (!TargetName) 4984 return 0; 4985 4986 // Warn about using declarations. 4987 // TODO: store that the declaration was written without 'using' and 4988 // talk about access decls instead of using decls in the 4989 // diagnostics. 4990 if (!HasUsingKeyword) { 4991 UsingLoc = Name.getSourceRange().getBegin(); 4992 4993 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4994 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4995 } 4996 4997 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4998 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4999 return 0; 5000 5001 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5002 TargetNameInfo, AttrList, 5003 /* IsInstantiation */ false, 5004 IsTypeName, TypenameLoc); 5005 if (UD) 5006 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5007 5008 return UD; 5009} 5010 5011/// \brief Determine whether a using declaration considers the given 5012/// declarations as "equivalent", e.g., if they are redeclarations of 5013/// the same entity or are both typedefs of the same type. 5014static bool 5015IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5016 bool &SuppressRedeclaration) { 5017 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5018 SuppressRedeclaration = false; 5019 return true; 5020 } 5021 5022 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5023 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5024 SuppressRedeclaration = true; 5025 return Context.hasSameType(TD1->getUnderlyingType(), 5026 TD2->getUnderlyingType()); 5027 } 5028 5029 return false; 5030} 5031 5032 5033/// Determines whether to create a using shadow decl for a particular 5034/// decl, given the set of decls existing prior to this using lookup. 5035bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5036 const LookupResult &Previous) { 5037 // Diagnose finding a decl which is not from a base class of the 5038 // current class. We do this now because there are cases where this 5039 // function will silently decide not to build a shadow decl, which 5040 // will pre-empt further diagnostics. 5041 // 5042 // We don't need to do this in C++0x because we do the check once on 5043 // the qualifier. 5044 // 5045 // FIXME: diagnose the following if we care enough: 5046 // struct A { int foo; }; 5047 // struct B : A { using A::foo; }; 5048 // template <class T> struct C : A {}; 5049 // template <class T> struct D : C<T> { using B::foo; } // <--- 5050 // This is invalid (during instantiation) in C++03 because B::foo 5051 // resolves to the using decl in B, which is not a base class of D<T>. 5052 // We can't diagnose it immediately because C<T> is an unknown 5053 // specialization. The UsingShadowDecl in D<T> then points directly 5054 // to A::foo, which will look well-formed when we instantiate. 5055 // The right solution is to not collapse the shadow-decl chain. 5056 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5057 DeclContext *OrigDC = Orig->getDeclContext(); 5058 5059 // Handle enums and anonymous structs. 5060 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5061 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5062 while (OrigRec->isAnonymousStructOrUnion()) 5063 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5064 5065 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5066 if (OrigDC == CurContext) { 5067 Diag(Using->getLocation(), 5068 diag::err_using_decl_nested_name_specifier_is_current_class) 5069 << Using->getQualifierLoc().getSourceRange(); 5070 Diag(Orig->getLocation(), diag::note_using_decl_target); 5071 return true; 5072 } 5073 5074 Diag(Using->getQualifierLoc().getBeginLoc(), 5075 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5076 << Using->getQualifier() 5077 << cast<CXXRecordDecl>(CurContext) 5078 << Using->getQualifierLoc().getSourceRange(); 5079 Diag(Orig->getLocation(), diag::note_using_decl_target); 5080 return true; 5081 } 5082 } 5083 5084 if (Previous.empty()) return false; 5085 5086 NamedDecl *Target = Orig; 5087 if (isa<UsingShadowDecl>(Target)) 5088 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5089 5090 // If the target happens to be one of the previous declarations, we 5091 // don't have a conflict. 5092 // 5093 // FIXME: but we might be increasing its access, in which case we 5094 // should redeclare it. 5095 NamedDecl *NonTag = 0, *Tag = 0; 5096 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5097 I != E; ++I) { 5098 NamedDecl *D = (*I)->getUnderlyingDecl(); 5099 bool Result; 5100 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5101 return Result; 5102 5103 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5104 } 5105 5106 if (Target->isFunctionOrFunctionTemplate()) { 5107 FunctionDecl *FD; 5108 if (isa<FunctionTemplateDecl>(Target)) 5109 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5110 else 5111 FD = cast<FunctionDecl>(Target); 5112 5113 NamedDecl *OldDecl = 0; 5114 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5115 case Ovl_Overload: 5116 return false; 5117 5118 case Ovl_NonFunction: 5119 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5120 break; 5121 5122 // We found a decl with the exact signature. 5123 case Ovl_Match: 5124 // If we're in a record, we want to hide the target, so we 5125 // return true (without a diagnostic) to tell the caller not to 5126 // build a shadow decl. 5127 if (CurContext->isRecord()) 5128 return true; 5129 5130 // If we're not in a record, this is an error. 5131 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5132 break; 5133 } 5134 5135 Diag(Target->getLocation(), diag::note_using_decl_target); 5136 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5137 return true; 5138 } 5139 5140 // Target is not a function. 5141 5142 if (isa<TagDecl>(Target)) { 5143 // No conflict between a tag and a non-tag. 5144 if (!Tag) return false; 5145 5146 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5147 Diag(Target->getLocation(), diag::note_using_decl_target); 5148 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5149 return true; 5150 } 5151 5152 // No conflict between a tag and a non-tag. 5153 if (!NonTag) return false; 5154 5155 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5156 Diag(Target->getLocation(), diag::note_using_decl_target); 5157 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5158 return true; 5159} 5160 5161/// Builds a shadow declaration corresponding to a 'using' declaration. 5162UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5163 UsingDecl *UD, 5164 NamedDecl *Orig) { 5165 5166 // If we resolved to another shadow declaration, just coalesce them. 5167 NamedDecl *Target = Orig; 5168 if (isa<UsingShadowDecl>(Target)) { 5169 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5170 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5171 } 5172 5173 UsingShadowDecl *Shadow 5174 = UsingShadowDecl::Create(Context, CurContext, 5175 UD->getLocation(), UD, Target); 5176 UD->addShadowDecl(Shadow); 5177 5178 Shadow->setAccess(UD->getAccess()); 5179 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5180 Shadow->setInvalidDecl(); 5181 5182 if (S) 5183 PushOnScopeChains(Shadow, S); 5184 else 5185 CurContext->addDecl(Shadow); 5186 5187 5188 return Shadow; 5189} 5190 5191/// Hides a using shadow declaration. This is required by the current 5192/// using-decl implementation when a resolvable using declaration in a 5193/// class is followed by a declaration which would hide or override 5194/// one or more of the using decl's targets; for example: 5195/// 5196/// struct Base { void foo(int); }; 5197/// struct Derived : Base { 5198/// using Base::foo; 5199/// void foo(int); 5200/// }; 5201/// 5202/// The governing language is C++03 [namespace.udecl]p12: 5203/// 5204/// When a using-declaration brings names from a base class into a 5205/// derived class scope, member functions in the derived class 5206/// override and/or hide member functions with the same name and 5207/// parameter types in a base class (rather than conflicting). 5208/// 5209/// There are two ways to implement this: 5210/// (1) optimistically create shadow decls when they're not hidden 5211/// by existing declarations, or 5212/// (2) don't create any shadow decls (or at least don't make them 5213/// visible) until we've fully parsed/instantiated the class. 5214/// The problem with (1) is that we might have to retroactively remove 5215/// a shadow decl, which requires several O(n) operations because the 5216/// decl structures are (very reasonably) not designed for removal. 5217/// (2) avoids this but is very fiddly and phase-dependent. 5218void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5219 if (Shadow->getDeclName().getNameKind() == 5220 DeclarationName::CXXConversionFunctionName) 5221 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5222 5223 // Remove it from the DeclContext... 5224 Shadow->getDeclContext()->removeDecl(Shadow); 5225 5226 // ...and the scope, if applicable... 5227 if (S) { 5228 S->RemoveDecl(Shadow); 5229 IdResolver.RemoveDecl(Shadow); 5230 } 5231 5232 // ...and the using decl. 5233 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5234 5235 // TODO: complain somehow if Shadow was used. It shouldn't 5236 // be possible for this to happen, because...? 5237} 5238 5239/// Builds a using declaration. 5240/// 5241/// \param IsInstantiation - Whether this call arises from an 5242/// instantiation of an unresolved using declaration. We treat 5243/// the lookup differently for these declarations. 5244NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5245 SourceLocation UsingLoc, 5246 CXXScopeSpec &SS, 5247 const DeclarationNameInfo &NameInfo, 5248 AttributeList *AttrList, 5249 bool IsInstantiation, 5250 bool IsTypeName, 5251 SourceLocation TypenameLoc) { 5252 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5253 SourceLocation IdentLoc = NameInfo.getLoc(); 5254 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5255 5256 // FIXME: We ignore attributes for now. 5257 5258 if (SS.isEmpty()) { 5259 Diag(IdentLoc, diag::err_using_requires_qualname); 5260 return 0; 5261 } 5262 5263 // Do the redeclaration lookup in the current scope. 5264 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5265 ForRedeclaration); 5266 Previous.setHideTags(false); 5267 if (S) { 5268 LookupName(Previous, S); 5269 5270 // It is really dumb that we have to do this. 5271 LookupResult::Filter F = Previous.makeFilter(); 5272 while (F.hasNext()) { 5273 NamedDecl *D = F.next(); 5274 if (!isDeclInScope(D, CurContext, S)) 5275 F.erase(); 5276 } 5277 F.done(); 5278 } else { 5279 assert(IsInstantiation && "no scope in non-instantiation"); 5280 assert(CurContext->isRecord() && "scope not record in instantiation"); 5281 LookupQualifiedName(Previous, CurContext); 5282 } 5283 5284 // Check for invalid redeclarations. 5285 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5286 return 0; 5287 5288 // Check for bad qualifiers. 5289 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5290 return 0; 5291 5292 DeclContext *LookupContext = computeDeclContext(SS); 5293 NamedDecl *D; 5294 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5295 if (!LookupContext) { 5296 if (IsTypeName) { 5297 // FIXME: not all declaration name kinds are legal here 5298 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5299 UsingLoc, TypenameLoc, 5300 QualifierLoc, 5301 IdentLoc, NameInfo.getName()); 5302 } else { 5303 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5304 QualifierLoc, NameInfo); 5305 } 5306 } else { 5307 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5308 NameInfo, IsTypeName); 5309 } 5310 D->setAccess(AS); 5311 CurContext->addDecl(D); 5312 5313 if (!LookupContext) return D; 5314 UsingDecl *UD = cast<UsingDecl>(D); 5315 5316 if (RequireCompleteDeclContext(SS, LookupContext)) { 5317 UD->setInvalidDecl(); 5318 return UD; 5319 } 5320 5321 // Constructor inheriting using decls get special treatment. 5322 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5323 if (CheckInheritedConstructorUsingDecl(UD)) 5324 UD->setInvalidDecl(); 5325 return UD; 5326 } 5327 5328 // Otherwise, look up the target name. 5329 5330 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5331 R.setUsingDeclaration(true); 5332 5333 // Unlike most lookups, we don't always want to hide tag 5334 // declarations: tag names are visible through the using declaration 5335 // even if hidden by ordinary names, *except* in a dependent context 5336 // where it's important for the sanity of two-phase lookup. 5337 if (!IsInstantiation) 5338 R.setHideTags(false); 5339 5340 LookupQualifiedName(R, LookupContext); 5341 5342 if (R.empty()) { 5343 Diag(IdentLoc, diag::err_no_member) 5344 << NameInfo.getName() << LookupContext << SS.getRange(); 5345 UD->setInvalidDecl(); 5346 return UD; 5347 } 5348 5349 if (R.isAmbiguous()) { 5350 UD->setInvalidDecl(); 5351 return UD; 5352 } 5353 5354 if (IsTypeName) { 5355 // If we asked for a typename and got a non-type decl, error out. 5356 if (!R.getAsSingle<TypeDecl>()) { 5357 Diag(IdentLoc, diag::err_using_typename_non_type); 5358 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5359 Diag((*I)->getUnderlyingDecl()->getLocation(), 5360 diag::note_using_decl_target); 5361 UD->setInvalidDecl(); 5362 return UD; 5363 } 5364 } else { 5365 // If we asked for a non-typename and we got a type, error out, 5366 // but only if this is an instantiation of an unresolved using 5367 // decl. Otherwise just silently find the type name. 5368 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5369 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5370 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5371 UD->setInvalidDecl(); 5372 return UD; 5373 } 5374 } 5375 5376 // C++0x N2914 [namespace.udecl]p6: 5377 // A using-declaration shall not name a namespace. 5378 if (R.getAsSingle<NamespaceDecl>()) { 5379 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5380 << SS.getRange(); 5381 UD->setInvalidDecl(); 5382 return UD; 5383 } 5384 5385 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5386 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5387 BuildUsingShadowDecl(S, UD, *I); 5388 } 5389 5390 return UD; 5391} 5392 5393/// Additional checks for a using declaration referring to a constructor name. 5394bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5395 if (UD->isTypeName()) { 5396 // FIXME: Cannot specify typename when specifying constructor 5397 return true; 5398 } 5399 5400 const Type *SourceType = UD->getQualifier()->getAsType(); 5401 assert(SourceType && 5402 "Using decl naming constructor doesn't have type in scope spec."); 5403 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5404 5405 // Check whether the named type is a direct base class. 5406 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5407 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5408 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5409 BaseIt != BaseE; ++BaseIt) { 5410 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5411 if (CanonicalSourceType == BaseType) 5412 break; 5413 } 5414 5415 if (BaseIt == BaseE) { 5416 // Did not find SourceType in the bases. 5417 Diag(UD->getUsingLocation(), 5418 diag::err_using_decl_constructor_not_in_direct_base) 5419 << UD->getNameInfo().getSourceRange() 5420 << QualType(SourceType, 0) << TargetClass; 5421 return true; 5422 } 5423 5424 BaseIt->setInheritConstructors(); 5425 5426 return false; 5427} 5428 5429/// Checks that the given using declaration is not an invalid 5430/// redeclaration. Note that this is checking only for the using decl 5431/// itself, not for any ill-formedness among the UsingShadowDecls. 5432bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5433 bool isTypeName, 5434 const CXXScopeSpec &SS, 5435 SourceLocation NameLoc, 5436 const LookupResult &Prev) { 5437 // C++03 [namespace.udecl]p8: 5438 // C++0x [namespace.udecl]p10: 5439 // A using-declaration is a declaration and can therefore be used 5440 // repeatedly where (and only where) multiple declarations are 5441 // allowed. 5442 // 5443 // That's in non-member contexts. 5444 if (!CurContext->getRedeclContext()->isRecord()) 5445 return false; 5446 5447 NestedNameSpecifier *Qual 5448 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5449 5450 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5451 NamedDecl *D = *I; 5452 5453 bool DTypename; 5454 NestedNameSpecifier *DQual; 5455 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5456 DTypename = UD->isTypeName(); 5457 DQual = UD->getQualifier(); 5458 } else if (UnresolvedUsingValueDecl *UD 5459 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5460 DTypename = false; 5461 DQual = UD->getQualifier(); 5462 } else if (UnresolvedUsingTypenameDecl *UD 5463 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5464 DTypename = true; 5465 DQual = UD->getQualifier(); 5466 } else continue; 5467 5468 // using decls differ if one says 'typename' and the other doesn't. 5469 // FIXME: non-dependent using decls? 5470 if (isTypeName != DTypename) continue; 5471 5472 // using decls differ if they name different scopes (but note that 5473 // template instantiation can cause this check to trigger when it 5474 // didn't before instantiation). 5475 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5476 Context.getCanonicalNestedNameSpecifier(DQual)) 5477 continue; 5478 5479 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5480 Diag(D->getLocation(), diag::note_using_decl) << 1; 5481 return true; 5482 } 5483 5484 return false; 5485} 5486 5487 5488/// Checks that the given nested-name qualifier used in a using decl 5489/// in the current context is appropriately related to the current 5490/// scope. If an error is found, diagnoses it and returns true. 5491bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5492 const CXXScopeSpec &SS, 5493 SourceLocation NameLoc) { 5494 DeclContext *NamedContext = computeDeclContext(SS); 5495 5496 if (!CurContext->isRecord()) { 5497 // C++03 [namespace.udecl]p3: 5498 // C++0x [namespace.udecl]p8: 5499 // A using-declaration for a class member shall be a member-declaration. 5500 5501 // If we weren't able to compute a valid scope, it must be a 5502 // dependent class scope. 5503 if (!NamedContext || NamedContext->isRecord()) { 5504 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5505 << SS.getRange(); 5506 return true; 5507 } 5508 5509 // Otherwise, everything is known to be fine. 5510 return false; 5511 } 5512 5513 // The current scope is a record. 5514 5515 // If the named context is dependent, we can't decide much. 5516 if (!NamedContext) { 5517 // FIXME: in C++0x, we can diagnose if we can prove that the 5518 // nested-name-specifier does not refer to a base class, which is 5519 // still possible in some cases. 5520 5521 // Otherwise we have to conservatively report that things might be 5522 // okay. 5523 return false; 5524 } 5525 5526 if (!NamedContext->isRecord()) { 5527 // Ideally this would point at the last name in the specifier, 5528 // but we don't have that level of source info. 5529 Diag(SS.getRange().getBegin(), 5530 diag::err_using_decl_nested_name_specifier_is_not_class) 5531 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5532 return true; 5533 } 5534 5535 if (!NamedContext->isDependentContext() && 5536 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5537 return true; 5538 5539 if (getLangOptions().CPlusPlus0x) { 5540 // C++0x [namespace.udecl]p3: 5541 // In a using-declaration used as a member-declaration, the 5542 // nested-name-specifier shall name a base class of the class 5543 // being defined. 5544 5545 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5546 cast<CXXRecordDecl>(NamedContext))) { 5547 if (CurContext == NamedContext) { 5548 Diag(NameLoc, 5549 diag::err_using_decl_nested_name_specifier_is_current_class) 5550 << SS.getRange(); 5551 return true; 5552 } 5553 5554 Diag(SS.getRange().getBegin(), 5555 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5556 << (NestedNameSpecifier*) SS.getScopeRep() 5557 << cast<CXXRecordDecl>(CurContext) 5558 << SS.getRange(); 5559 return true; 5560 } 5561 5562 return false; 5563 } 5564 5565 // C++03 [namespace.udecl]p4: 5566 // A using-declaration used as a member-declaration shall refer 5567 // to a member of a base class of the class being defined [etc.]. 5568 5569 // Salient point: SS doesn't have to name a base class as long as 5570 // lookup only finds members from base classes. Therefore we can 5571 // diagnose here only if we can prove that that can't happen, 5572 // i.e. if the class hierarchies provably don't intersect. 5573 5574 // TODO: it would be nice if "definitely valid" results were cached 5575 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5576 // need to be repeated. 5577 5578 struct UserData { 5579 llvm::DenseSet<const CXXRecordDecl*> Bases; 5580 5581 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5582 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5583 Data->Bases.insert(Base); 5584 return true; 5585 } 5586 5587 bool hasDependentBases(const CXXRecordDecl *Class) { 5588 return !Class->forallBases(collect, this); 5589 } 5590 5591 /// Returns true if the base is dependent or is one of the 5592 /// accumulated base classes. 5593 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5594 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5595 return !Data->Bases.count(Base); 5596 } 5597 5598 bool mightShareBases(const CXXRecordDecl *Class) { 5599 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5600 } 5601 }; 5602 5603 UserData Data; 5604 5605 // Returns false if we find a dependent base. 5606 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5607 return false; 5608 5609 // Returns false if the class has a dependent base or if it or one 5610 // of its bases is present in the base set of the current context. 5611 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5612 return false; 5613 5614 Diag(SS.getRange().getBegin(), 5615 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5616 << (NestedNameSpecifier*) SS.getScopeRep() 5617 << cast<CXXRecordDecl>(CurContext) 5618 << SS.getRange(); 5619 5620 return true; 5621} 5622 5623Decl *Sema::ActOnAliasDeclaration(Scope *S, 5624 AccessSpecifier AS, 5625 MultiTemplateParamsArg TemplateParamLists, 5626 SourceLocation UsingLoc, 5627 UnqualifiedId &Name, 5628 TypeResult Type) { 5629 // Skip up to the relevant declaration scope. 5630 while (S->getFlags() & Scope::TemplateParamScope) 5631 S = S->getParent(); 5632 assert((S->getFlags() & Scope::DeclScope) && 5633 "got alias-declaration outside of declaration scope"); 5634 5635 if (Type.isInvalid()) 5636 return 0; 5637 5638 bool Invalid = false; 5639 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5640 TypeSourceInfo *TInfo = 0; 5641 GetTypeFromParser(Type.get(), &TInfo); 5642 5643 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5644 return 0; 5645 5646 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5647 UPPC_DeclarationType)) { 5648 Invalid = true; 5649 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5650 TInfo->getTypeLoc().getBeginLoc()); 5651 } 5652 5653 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5654 LookupName(Previous, S); 5655 5656 // Warn about shadowing the name of a template parameter. 5657 if (Previous.isSingleResult() && 5658 Previous.getFoundDecl()->isTemplateParameter()) { 5659 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5660 Previous.getFoundDecl())) 5661 Invalid = true; 5662 Previous.clear(); 5663 } 5664 5665 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5666 "name in alias declaration must be an identifier"); 5667 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5668 Name.StartLocation, 5669 Name.Identifier, TInfo); 5670 5671 NewTD->setAccess(AS); 5672 5673 if (Invalid) 5674 NewTD->setInvalidDecl(); 5675 5676 CheckTypedefForVariablyModifiedType(S, NewTD); 5677 Invalid |= NewTD->isInvalidDecl(); 5678 5679 bool Redeclaration = false; 5680 5681 NamedDecl *NewND; 5682 if (TemplateParamLists.size()) { 5683 TypeAliasTemplateDecl *OldDecl = 0; 5684 TemplateParameterList *OldTemplateParams = 0; 5685 5686 if (TemplateParamLists.size() != 1) { 5687 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5688 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5689 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5690 } 5691 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5692 5693 // Only consider previous declarations in the same scope. 5694 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5695 /*ExplicitInstantiationOrSpecialization*/false); 5696 if (!Previous.empty()) { 5697 Redeclaration = true; 5698 5699 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5700 if (!OldDecl && !Invalid) { 5701 Diag(UsingLoc, diag::err_redefinition_different_kind) 5702 << Name.Identifier; 5703 5704 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5705 if (OldD->getLocation().isValid()) 5706 Diag(OldD->getLocation(), diag::note_previous_definition); 5707 5708 Invalid = true; 5709 } 5710 5711 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5712 if (TemplateParameterListsAreEqual(TemplateParams, 5713 OldDecl->getTemplateParameters(), 5714 /*Complain=*/true, 5715 TPL_TemplateMatch)) 5716 OldTemplateParams = OldDecl->getTemplateParameters(); 5717 else 5718 Invalid = true; 5719 5720 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5721 if (!Invalid && 5722 !Context.hasSameType(OldTD->getUnderlyingType(), 5723 NewTD->getUnderlyingType())) { 5724 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5725 // but we can't reasonably accept it. 5726 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5727 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5728 if (OldTD->getLocation().isValid()) 5729 Diag(OldTD->getLocation(), diag::note_previous_definition); 5730 Invalid = true; 5731 } 5732 } 5733 } 5734 5735 // Merge any previous default template arguments into our parameters, 5736 // and check the parameter list. 5737 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5738 TPC_TypeAliasTemplate)) 5739 return 0; 5740 5741 TypeAliasTemplateDecl *NewDecl = 5742 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5743 Name.Identifier, TemplateParams, 5744 NewTD); 5745 5746 NewDecl->setAccess(AS); 5747 5748 if (Invalid) 5749 NewDecl->setInvalidDecl(); 5750 else if (OldDecl) 5751 NewDecl->setPreviousDeclaration(OldDecl); 5752 5753 NewND = NewDecl; 5754 } else { 5755 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5756 NewND = NewTD; 5757 } 5758 5759 if (!Redeclaration) 5760 PushOnScopeChains(NewND, S); 5761 5762 return NewND; 5763} 5764 5765Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5766 SourceLocation NamespaceLoc, 5767 SourceLocation AliasLoc, 5768 IdentifierInfo *Alias, 5769 CXXScopeSpec &SS, 5770 SourceLocation IdentLoc, 5771 IdentifierInfo *Ident) { 5772 5773 // Lookup the namespace name. 5774 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5775 LookupParsedName(R, S, &SS); 5776 5777 // Check if we have a previous declaration with the same name. 5778 NamedDecl *PrevDecl 5779 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5780 ForRedeclaration); 5781 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5782 PrevDecl = 0; 5783 5784 if (PrevDecl) { 5785 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5786 // We already have an alias with the same name that points to the same 5787 // namespace, so don't create a new one. 5788 // FIXME: At some point, we'll want to create the (redundant) 5789 // declaration to maintain better source information. 5790 if (!R.isAmbiguous() && !R.empty() && 5791 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5792 return 0; 5793 } 5794 5795 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5796 diag::err_redefinition_different_kind; 5797 Diag(AliasLoc, DiagID) << Alias; 5798 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5799 return 0; 5800 } 5801 5802 if (R.isAmbiguous()) 5803 return 0; 5804 5805 if (R.empty()) { 5806 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5807 CTC_NoKeywords, 0)) { 5808 if (R.getAsSingle<NamespaceDecl>() || 5809 R.getAsSingle<NamespaceAliasDecl>()) { 5810 if (DeclContext *DC = computeDeclContext(SS, false)) 5811 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5812 << Ident << DC << Corrected << SS.getRange() 5813 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5814 else 5815 Diag(IdentLoc, diag::err_using_directive_suggest) 5816 << Ident << Corrected 5817 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5818 5819 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5820 << Corrected; 5821 5822 Ident = Corrected.getAsIdentifierInfo(); 5823 } else { 5824 R.clear(); 5825 R.setLookupName(Ident); 5826 } 5827 } 5828 5829 if (R.empty()) { 5830 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5831 return 0; 5832 } 5833 } 5834 5835 NamespaceAliasDecl *AliasDecl = 5836 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5837 Alias, SS.getWithLocInContext(Context), 5838 IdentLoc, R.getFoundDecl()); 5839 5840 PushOnScopeChains(AliasDecl, S); 5841 return AliasDecl; 5842} 5843 5844namespace { 5845 /// \brief Scoped object used to handle the state changes required in Sema 5846 /// to implicitly define the body of a C++ member function; 5847 class ImplicitlyDefinedFunctionScope { 5848 Sema &S; 5849 Sema::ContextRAII SavedContext; 5850 5851 public: 5852 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5853 : S(S), SavedContext(S, Method) 5854 { 5855 S.PushFunctionScope(); 5856 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5857 } 5858 5859 ~ImplicitlyDefinedFunctionScope() { 5860 S.PopExpressionEvaluationContext(); 5861 S.PopFunctionOrBlockScope(); 5862 } 5863 }; 5864} 5865 5866Sema::ImplicitExceptionSpecification 5867Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5868 // C++ [except.spec]p14: 5869 // An implicitly declared special member function (Clause 12) shall have an 5870 // exception-specification. [...] 5871 ImplicitExceptionSpecification ExceptSpec(Context); 5872 5873 // Direct base-class constructors. 5874 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5875 BEnd = ClassDecl->bases_end(); 5876 B != BEnd; ++B) { 5877 if (B->isVirtual()) // Handled below. 5878 continue; 5879 5880 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5881 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5882 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5883 // If this is a deleted function, add it anyway. This might be conformant 5884 // with the standard. This might not. I'm not sure. It might not matter. 5885 if (Constructor) 5886 ExceptSpec.CalledDecl(Constructor); 5887 } 5888 } 5889 5890 // Virtual base-class constructors. 5891 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5892 BEnd = ClassDecl->vbases_end(); 5893 B != BEnd; ++B) { 5894 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5895 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5896 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5897 // If this is a deleted function, add it anyway. This might be conformant 5898 // with the standard. This might not. I'm not sure. It might not matter. 5899 if (Constructor) 5900 ExceptSpec.CalledDecl(Constructor); 5901 } 5902 } 5903 5904 // Field constructors. 5905 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5906 FEnd = ClassDecl->field_end(); 5907 F != FEnd; ++F) { 5908 if (const RecordType *RecordTy 5909 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5910 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5911 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5912 // If this is a deleted function, add it anyway. This might be conformant 5913 // with the standard. This might not. I'm not sure. It might not matter. 5914 // In particular, the problem is that this function never gets called. It 5915 // might just be ill-formed because this function attempts to refer to 5916 // a deleted function here. 5917 if (Constructor) 5918 ExceptSpec.CalledDecl(Constructor); 5919 } 5920 } 5921 5922 return ExceptSpec; 5923} 5924 5925CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5926 CXXRecordDecl *ClassDecl) { 5927 // C++ [class.ctor]p5: 5928 // A default constructor for a class X is a constructor of class X 5929 // that can be called without an argument. If there is no 5930 // user-declared constructor for class X, a default constructor is 5931 // implicitly declared. An implicitly-declared default constructor 5932 // is an inline public member of its class. 5933 assert(!ClassDecl->hasUserDeclaredConstructor() && 5934 "Should not build implicit default constructor!"); 5935 5936 ImplicitExceptionSpecification Spec = 5937 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5938 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5939 5940 // Create the actual constructor declaration. 5941 CanQualType ClassType 5942 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5943 SourceLocation ClassLoc = ClassDecl->getLocation(); 5944 DeclarationName Name 5945 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5946 DeclarationNameInfo NameInfo(Name, ClassLoc); 5947 CXXConstructorDecl *DefaultCon 5948 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5949 Context.getFunctionType(Context.VoidTy, 5950 0, 0, EPI), 5951 /*TInfo=*/0, 5952 /*isExplicit=*/false, 5953 /*isInline=*/true, 5954 /*isImplicitlyDeclared=*/true); 5955 DefaultCon->setAccess(AS_public); 5956 DefaultCon->setDefaulted(); 5957 DefaultCon->setImplicit(); 5958 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5959 5960 // Note that we have declared this constructor. 5961 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5962 5963 if (Scope *S = getScopeForContext(ClassDecl)) 5964 PushOnScopeChains(DefaultCon, S, false); 5965 ClassDecl->addDecl(DefaultCon); 5966 5967 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5968 DefaultCon->setDeletedAsWritten(); 5969 5970 return DefaultCon; 5971} 5972 5973void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5974 CXXConstructorDecl *Constructor) { 5975 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5976 !Constructor->doesThisDeclarationHaveABody() && 5977 !Constructor->isDeleted()) && 5978 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5979 5980 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5981 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5982 5983 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5984 DiagnosticErrorTrap Trap(Diags); 5985 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5986 Trap.hasErrorOccurred()) { 5987 Diag(CurrentLocation, diag::note_member_synthesized_at) 5988 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 5989 Constructor->setInvalidDecl(); 5990 return; 5991 } 5992 5993 SourceLocation Loc = Constructor->getLocation(); 5994 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5995 5996 Constructor->setUsed(); 5997 MarkVTableUsed(CurrentLocation, ClassDecl); 5998 5999 if (ASTMutationListener *L = getASTMutationListener()) { 6000 L->CompletedImplicitDefinition(Constructor); 6001 } 6002} 6003 6004void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6005 // We start with an initial pass over the base classes to collect those that 6006 // inherit constructors from. If there are none, we can forgo all further 6007 // processing. 6008 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6009 BasesVector BasesToInheritFrom; 6010 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6011 BaseE = ClassDecl->bases_end(); 6012 BaseIt != BaseE; ++BaseIt) { 6013 if (BaseIt->getInheritConstructors()) { 6014 QualType Base = BaseIt->getType(); 6015 if (Base->isDependentType()) { 6016 // If we inherit constructors from anything that is dependent, just 6017 // abort processing altogether. We'll get another chance for the 6018 // instantiations. 6019 return; 6020 } 6021 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6022 } 6023 } 6024 if (BasesToInheritFrom.empty()) 6025 return; 6026 6027 // Now collect the constructors that we already have in the current class. 6028 // Those take precedence over inherited constructors. 6029 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6030 // unless there is a user-declared constructor with the same signature in 6031 // the class where the using-declaration appears. 6032 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6033 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6034 CtorE = ClassDecl->ctor_end(); 6035 CtorIt != CtorE; ++CtorIt) { 6036 ExistingConstructors.insert( 6037 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6038 } 6039 6040 Scope *S = getScopeForContext(ClassDecl); 6041 DeclarationName CreatedCtorName = 6042 Context.DeclarationNames.getCXXConstructorName( 6043 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6044 6045 // Now comes the true work. 6046 // First, we keep a map from constructor types to the base that introduced 6047 // them. Needed for finding conflicting constructors. We also keep the 6048 // actually inserted declarations in there, for pretty diagnostics. 6049 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6050 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6051 ConstructorToSourceMap InheritedConstructors; 6052 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6053 BaseE = BasesToInheritFrom.end(); 6054 BaseIt != BaseE; ++BaseIt) { 6055 const RecordType *Base = *BaseIt; 6056 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6057 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6058 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6059 CtorE = BaseDecl->ctor_end(); 6060 CtorIt != CtorE; ++CtorIt) { 6061 // Find the using declaration for inheriting this base's constructors. 6062 DeclarationName Name = 6063 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6064 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6065 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6066 SourceLocation UsingLoc = UD ? UD->getLocation() : 6067 ClassDecl->getLocation(); 6068 6069 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6070 // from the class X named in the using-declaration consists of actual 6071 // constructors and notional constructors that result from the 6072 // transformation of defaulted parameters as follows: 6073 // - all non-template default constructors of X, and 6074 // - for each non-template constructor of X that has at least one 6075 // parameter with a default argument, the set of constructors that 6076 // results from omitting any ellipsis parameter specification and 6077 // successively omitting parameters with a default argument from the 6078 // end of the parameter-type-list. 6079 CXXConstructorDecl *BaseCtor = *CtorIt; 6080 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6081 const FunctionProtoType *BaseCtorType = 6082 BaseCtor->getType()->getAs<FunctionProtoType>(); 6083 6084 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6085 maxParams = BaseCtor->getNumParams(); 6086 params <= maxParams; ++params) { 6087 // Skip default constructors. They're never inherited. 6088 if (params == 0) 6089 continue; 6090 // Skip copy and move constructors for the same reason. 6091 if (CanBeCopyOrMove && params == 1) 6092 continue; 6093 6094 // Build up a function type for this particular constructor. 6095 // FIXME: The working paper does not consider that the exception spec 6096 // for the inheriting constructor might be larger than that of the 6097 // source. This code doesn't yet, either. 6098 const Type *NewCtorType; 6099 if (params == maxParams) 6100 NewCtorType = BaseCtorType; 6101 else { 6102 llvm::SmallVector<QualType, 16> Args; 6103 for (unsigned i = 0; i < params; ++i) { 6104 Args.push_back(BaseCtorType->getArgType(i)); 6105 } 6106 FunctionProtoType::ExtProtoInfo ExtInfo = 6107 BaseCtorType->getExtProtoInfo(); 6108 ExtInfo.Variadic = false; 6109 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6110 Args.data(), params, ExtInfo) 6111 .getTypePtr(); 6112 } 6113 const Type *CanonicalNewCtorType = 6114 Context.getCanonicalType(NewCtorType); 6115 6116 // Now that we have the type, first check if the class already has a 6117 // constructor with this signature. 6118 if (ExistingConstructors.count(CanonicalNewCtorType)) 6119 continue; 6120 6121 // Then we check if we have already declared an inherited constructor 6122 // with this signature. 6123 std::pair<ConstructorToSourceMap::iterator, bool> result = 6124 InheritedConstructors.insert(std::make_pair( 6125 CanonicalNewCtorType, 6126 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6127 if (!result.second) { 6128 // Already in the map. If it came from a different class, that's an 6129 // error. Not if it's from the same. 6130 CanQualType PreviousBase = result.first->second.first; 6131 if (CanonicalBase != PreviousBase) { 6132 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6133 const CXXConstructorDecl *PrevBaseCtor = 6134 PrevCtor->getInheritedConstructor(); 6135 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6136 6137 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6138 Diag(BaseCtor->getLocation(), 6139 diag::note_using_decl_constructor_conflict_current_ctor); 6140 Diag(PrevBaseCtor->getLocation(), 6141 diag::note_using_decl_constructor_conflict_previous_ctor); 6142 Diag(PrevCtor->getLocation(), 6143 diag::note_using_decl_constructor_conflict_previous_using); 6144 } 6145 continue; 6146 } 6147 6148 // OK, we're there, now add the constructor. 6149 // C++0x [class.inhctor]p8: [...] that would be performed by a 6150 // user-writtern inline constructor [...] 6151 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6152 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6153 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6154 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6155 /*ImplicitlyDeclared=*/true); 6156 NewCtor->setAccess(BaseCtor->getAccess()); 6157 6158 // Build up the parameter decls and add them. 6159 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6160 for (unsigned i = 0; i < params; ++i) { 6161 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6162 UsingLoc, UsingLoc, 6163 /*IdentifierInfo=*/0, 6164 BaseCtorType->getArgType(i), 6165 /*TInfo=*/0, SC_None, 6166 SC_None, /*DefaultArg=*/0)); 6167 } 6168 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6169 NewCtor->setInheritedConstructor(BaseCtor); 6170 6171 PushOnScopeChains(NewCtor, S, false); 6172 ClassDecl->addDecl(NewCtor); 6173 result.first->second.second = NewCtor; 6174 } 6175 } 6176 } 6177} 6178 6179Sema::ImplicitExceptionSpecification 6180Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6181 // C++ [except.spec]p14: 6182 // An implicitly declared special member function (Clause 12) shall have 6183 // an exception-specification. 6184 ImplicitExceptionSpecification ExceptSpec(Context); 6185 6186 // Direct base-class destructors. 6187 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6188 BEnd = ClassDecl->bases_end(); 6189 B != BEnd; ++B) { 6190 if (B->isVirtual()) // Handled below. 6191 continue; 6192 6193 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6194 ExceptSpec.CalledDecl( 6195 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6196 } 6197 6198 // Virtual base-class destructors. 6199 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6200 BEnd = ClassDecl->vbases_end(); 6201 B != BEnd; ++B) { 6202 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6203 ExceptSpec.CalledDecl( 6204 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6205 } 6206 6207 // Field destructors. 6208 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6209 FEnd = ClassDecl->field_end(); 6210 F != FEnd; ++F) { 6211 if (const RecordType *RecordTy 6212 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6213 ExceptSpec.CalledDecl( 6214 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6215 } 6216 6217 return ExceptSpec; 6218} 6219 6220CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6221 // C++ [class.dtor]p2: 6222 // If a class has no user-declared destructor, a destructor is 6223 // declared implicitly. An implicitly-declared destructor is an 6224 // inline public member of its class. 6225 6226 ImplicitExceptionSpecification Spec = 6227 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6228 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6229 6230 // Create the actual destructor declaration. 6231 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6232 6233 CanQualType ClassType 6234 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6235 SourceLocation ClassLoc = ClassDecl->getLocation(); 6236 DeclarationName Name 6237 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6238 DeclarationNameInfo NameInfo(Name, ClassLoc); 6239 CXXDestructorDecl *Destructor 6240 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6241 /*isInline=*/true, 6242 /*isImplicitlyDeclared=*/true); 6243 Destructor->setAccess(AS_public); 6244 Destructor->setDefaulted(); 6245 Destructor->setImplicit(); 6246 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6247 6248 // Note that we have declared this destructor. 6249 ++ASTContext::NumImplicitDestructorsDeclared; 6250 6251 // Introduce this destructor into its scope. 6252 if (Scope *S = getScopeForContext(ClassDecl)) 6253 PushOnScopeChains(Destructor, S, false); 6254 ClassDecl->addDecl(Destructor); 6255 6256 // This could be uniqued if it ever proves significant. 6257 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6258 6259 if (ShouldDeleteDestructor(Destructor)) 6260 Destructor->setDeletedAsWritten(); 6261 6262 AddOverriddenMethods(ClassDecl, Destructor); 6263 6264 return Destructor; 6265} 6266 6267void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6268 CXXDestructorDecl *Destructor) { 6269 assert((Destructor->isDefaulted() && 6270 !Destructor->doesThisDeclarationHaveABody()) && 6271 "DefineImplicitDestructor - call it for implicit default dtor"); 6272 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6273 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6274 6275 if (Destructor->isInvalidDecl()) 6276 return; 6277 6278 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6279 6280 DiagnosticErrorTrap Trap(Diags); 6281 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6282 Destructor->getParent()); 6283 6284 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6285 Diag(CurrentLocation, diag::note_member_synthesized_at) 6286 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6287 6288 Destructor->setInvalidDecl(); 6289 return; 6290 } 6291 6292 SourceLocation Loc = Destructor->getLocation(); 6293 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6294 6295 Destructor->setUsed(); 6296 MarkVTableUsed(CurrentLocation, ClassDecl); 6297 6298 if (ASTMutationListener *L = getASTMutationListener()) { 6299 L->CompletedImplicitDefinition(Destructor); 6300 } 6301} 6302 6303void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6304 CXXDestructorDecl *destructor) { 6305 // C++11 [class.dtor]p3: 6306 // A declaration of a destructor that does not have an exception- 6307 // specification is implicitly considered to have the same exception- 6308 // specification as an implicit declaration. 6309 const FunctionProtoType *dtorType = destructor->getType()-> 6310 getAs<FunctionProtoType>(); 6311 if (dtorType->hasExceptionSpec()) 6312 return; 6313 6314 ImplicitExceptionSpecification exceptSpec = 6315 ComputeDefaultedDtorExceptionSpec(classDecl); 6316 6317 // Replace the destructor's type. 6318 FunctionProtoType::ExtProtoInfo epi; 6319 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6320 epi.NumExceptions = exceptSpec.size(); 6321 epi.Exceptions = exceptSpec.data(); 6322 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6323 6324 destructor->setType(ty); 6325 6326 // FIXME: If the destructor has a body that could throw, and the newly created 6327 // spec doesn't allow exceptions, we should emit a warning, because this 6328 // change in behavior can break conforming C++03 programs at runtime. 6329 // However, we don't have a body yet, so it needs to be done somewhere else. 6330} 6331 6332/// \brief Builds a statement that copies the given entity from \p From to 6333/// \c To. 6334/// 6335/// This routine is used to copy the members of a class with an 6336/// implicitly-declared copy assignment operator. When the entities being 6337/// copied are arrays, this routine builds for loops to copy them. 6338/// 6339/// \param S The Sema object used for type-checking. 6340/// 6341/// \param Loc The location where the implicit copy is being generated. 6342/// 6343/// \param T The type of the expressions being copied. Both expressions must 6344/// have this type. 6345/// 6346/// \param To The expression we are copying to. 6347/// 6348/// \param From The expression we are copying from. 6349/// 6350/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6351/// Otherwise, it's a non-static member subobject. 6352/// 6353/// \param Depth Internal parameter recording the depth of the recursion. 6354/// 6355/// \returns A statement or a loop that copies the expressions. 6356static StmtResult 6357BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6358 Expr *To, Expr *From, 6359 bool CopyingBaseSubobject, unsigned Depth = 0) { 6360 // C++0x [class.copy]p30: 6361 // Each subobject is assigned in the manner appropriate to its type: 6362 // 6363 // - if the subobject is of class type, the copy assignment operator 6364 // for the class is used (as if by explicit qualification; that is, 6365 // ignoring any possible virtual overriding functions in more derived 6366 // classes); 6367 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6368 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6369 6370 // Look for operator=. 6371 DeclarationName Name 6372 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6373 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6374 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6375 6376 // Filter out any result that isn't a copy-assignment operator. 6377 LookupResult::Filter F = OpLookup.makeFilter(); 6378 while (F.hasNext()) { 6379 NamedDecl *D = F.next(); 6380 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6381 if (Method->isCopyAssignmentOperator()) 6382 continue; 6383 6384 F.erase(); 6385 } 6386 F.done(); 6387 6388 // Suppress the protected check (C++ [class.protected]) for each of the 6389 // assignment operators we found. This strange dance is required when 6390 // we're assigning via a base classes's copy-assignment operator. To 6391 // ensure that we're getting the right base class subobject (without 6392 // ambiguities), we need to cast "this" to that subobject type; to 6393 // ensure that we don't go through the virtual call mechanism, we need 6394 // to qualify the operator= name with the base class (see below). However, 6395 // this means that if the base class has a protected copy assignment 6396 // operator, the protected member access check will fail. So, we 6397 // rewrite "protected" access to "public" access in this case, since we 6398 // know by construction that we're calling from a derived class. 6399 if (CopyingBaseSubobject) { 6400 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6401 L != LEnd; ++L) { 6402 if (L.getAccess() == AS_protected) 6403 L.setAccess(AS_public); 6404 } 6405 } 6406 6407 // Create the nested-name-specifier that will be used to qualify the 6408 // reference to operator=; this is required to suppress the virtual 6409 // call mechanism. 6410 CXXScopeSpec SS; 6411 SS.MakeTrivial(S.Context, 6412 NestedNameSpecifier::Create(S.Context, 0, false, 6413 T.getTypePtr()), 6414 Loc); 6415 6416 // Create the reference to operator=. 6417 ExprResult OpEqualRef 6418 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6419 /*FirstQualifierInScope=*/0, OpLookup, 6420 /*TemplateArgs=*/0, 6421 /*SuppressQualifierCheck=*/true); 6422 if (OpEqualRef.isInvalid()) 6423 return StmtError(); 6424 6425 // Build the call to the assignment operator. 6426 6427 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6428 OpEqualRef.takeAs<Expr>(), 6429 Loc, &From, 1, Loc); 6430 if (Call.isInvalid()) 6431 return StmtError(); 6432 6433 return S.Owned(Call.takeAs<Stmt>()); 6434 } 6435 6436 // - if the subobject is of scalar type, the built-in assignment 6437 // operator is used. 6438 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6439 if (!ArrayTy) { 6440 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6441 if (Assignment.isInvalid()) 6442 return StmtError(); 6443 6444 return S.Owned(Assignment.takeAs<Stmt>()); 6445 } 6446 6447 // - if the subobject is an array, each element is assigned, in the 6448 // manner appropriate to the element type; 6449 6450 // Construct a loop over the array bounds, e.g., 6451 // 6452 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6453 // 6454 // that will copy each of the array elements. 6455 QualType SizeType = S.Context.getSizeType(); 6456 6457 // Create the iteration variable. 6458 IdentifierInfo *IterationVarName = 0; 6459 { 6460 llvm::SmallString<8> Str; 6461 llvm::raw_svector_ostream OS(Str); 6462 OS << "__i" << Depth; 6463 IterationVarName = &S.Context.Idents.get(OS.str()); 6464 } 6465 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6466 IterationVarName, SizeType, 6467 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6468 SC_None, SC_None); 6469 6470 // Initialize the iteration variable to zero. 6471 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6472 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6473 6474 // Create a reference to the iteration variable; we'll use this several 6475 // times throughout. 6476 Expr *IterationVarRef 6477 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6478 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6479 6480 // Create the DeclStmt that holds the iteration variable. 6481 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6482 6483 // Create the comparison against the array bound. 6484 llvm::APInt Upper 6485 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6486 Expr *Comparison 6487 = new (S.Context) BinaryOperator(IterationVarRef, 6488 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6489 BO_NE, S.Context.BoolTy, 6490 VK_RValue, OK_Ordinary, Loc); 6491 6492 // Create the pre-increment of the iteration variable. 6493 Expr *Increment 6494 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6495 VK_LValue, OK_Ordinary, Loc); 6496 6497 // Subscript the "from" and "to" expressions with the iteration variable. 6498 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6499 IterationVarRef, Loc)); 6500 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6501 IterationVarRef, Loc)); 6502 6503 // Build the copy for an individual element of the array. 6504 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6505 To, From, CopyingBaseSubobject, 6506 Depth + 1); 6507 if (Copy.isInvalid()) 6508 return StmtError(); 6509 6510 // Construct the loop that copies all elements of this array. 6511 return S.ActOnForStmt(Loc, Loc, InitStmt, 6512 S.MakeFullExpr(Comparison), 6513 0, S.MakeFullExpr(Increment), 6514 Loc, Copy.take()); 6515} 6516 6517/// \brief Determine whether the given class has a copy assignment operator 6518/// that accepts a const-qualified argument. 6519static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 6520 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 6521 6522 if (!Class->hasDeclaredCopyAssignment()) 6523 S.DeclareImplicitCopyAssignment(Class); 6524 6525 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 6526 DeclarationName OpName 6527 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6528 6529 DeclContext::lookup_const_iterator Op, OpEnd; 6530 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 6531 // C++ [class.copy]p9: 6532 // A user-declared copy assignment operator is a non-static non-template 6533 // member function of class X with exactly one parameter of type X, X&, 6534 // const X&, volatile X& or const volatile X&. 6535 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 6536 if (!Method) 6537 continue; 6538 6539 if (Method->isStatic()) 6540 continue; 6541 if (Method->getPrimaryTemplate()) 6542 continue; 6543 const FunctionProtoType *FnType = 6544 Method->getType()->getAs<FunctionProtoType>(); 6545 assert(FnType && "Overloaded operator has no prototype."); 6546 // Don't assert on this; an invalid decl might have been left in the AST. 6547 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 6548 continue; 6549 bool AcceptsConst = true; 6550 QualType ArgType = FnType->getArgType(0); 6551 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 6552 ArgType = Ref->getPointeeType(); 6553 // Is it a non-const lvalue reference? 6554 if (!ArgType.isConstQualified()) 6555 AcceptsConst = false; 6556 } 6557 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 6558 continue; 6559 6560 // We have a single argument of type cv X or cv X&, i.e. we've found the 6561 // copy assignment operator. Return whether it accepts const arguments. 6562 return AcceptsConst; 6563 } 6564 assert(Class->isInvalidDecl() && 6565 "No copy assignment operator declared in valid code."); 6566 return false; 6567} 6568 6569std::pair<Sema::ImplicitExceptionSpecification, bool> 6570Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6571 CXXRecordDecl *ClassDecl) { 6572 // C++ [class.copy]p10: 6573 // If the class definition does not explicitly declare a copy 6574 // assignment operator, one is declared implicitly. 6575 // The implicitly-defined copy assignment operator for a class X 6576 // will have the form 6577 // 6578 // X& X::operator=(const X&) 6579 // 6580 // if 6581 bool HasConstCopyAssignment = true; 6582 6583 // -- each direct base class B of X has a copy assignment operator 6584 // whose parameter is of type const B&, const volatile B& or B, 6585 // and 6586 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6587 BaseEnd = ClassDecl->bases_end(); 6588 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6589 assert(!Base->getType()->isDependentType() && 6590 "Cannot generate implicit members for class with dependent bases."); 6591 const CXXRecordDecl *BaseClassDecl 6592 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6593 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 6594 } 6595 6596 // -- for all the nonstatic data members of X that are of a class 6597 // type M (or array thereof), each such class type has a copy 6598 // assignment operator whose parameter is of type const M&, 6599 // const volatile M& or M. 6600 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6601 FieldEnd = ClassDecl->field_end(); 6602 HasConstCopyAssignment && Field != FieldEnd; 6603 ++Field) { 6604 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6605 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6606 const CXXRecordDecl *FieldClassDecl 6607 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6608 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 6609 } 6610 } 6611 6612 // Otherwise, the implicitly declared copy assignment operator will 6613 // have the form 6614 // 6615 // X& X::operator=(X&) 6616 6617 // C++ [except.spec]p14: 6618 // An implicitly declared special member function (Clause 12) shall have an 6619 // exception-specification. [...] 6620 ImplicitExceptionSpecification ExceptSpec(Context); 6621 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6622 BaseEnd = ClassDecl->bases_end(); 6623 Base != BaseEnd; ++Base) { 6624 CXXRecordDecl *BaseClassDecl 6625 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6626 6627 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 6628 DeclareImplicitCopyAssignment(BaseClassDecl); 6629 6630 if (CXXMethodDecl *CopyAssign 6631 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6632 ExceptSpec.CalledDecl(CopyAssign); 6633 } 6634 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6635 FieldEnd = ClassDecl->field_end(); 6636 Field != FieldEnd; 6637 ++Field) { 6638 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6639 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6640 CXXRecordDecl *FieldClassDecl 6641 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6642 6643 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 6644 DeclareImplicitCopyAssignment(FieldClassDecl); 6645 6646 if (CXXMethodDecl *CopyAssign 6647 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 6648 ExceptSpec.CalledDecl(CopyAssign); 6649 } 6650 } 6651 6652 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6653} 6654 6655CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6656 // Note: The following rules are largely analoguous to the copy 6657 // constructor rules. Note that virtual bases are not taken into account 6658 // for determining the argument type of the operator. Note also that 6659 // operators taking an object instead of a reference are allowed. 6660 6661 ImplicitExceptionSpecification Spec(Context); 6662 bool Const; 6663 llvm::tie(Spec, Const) = 6664 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6665 6666 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6667 QualType RetType = Context.getLValueReferenceType(ArgType); 6668 if (Const) 6669 ArgType = ArgType.withConst(); 6670 ArgType = Context.getLValueReferenceType(ArgType); 6671 6672 // An implicitly-declared copy assignment operator is an inline public 6673 // member of its class. 6674 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6675 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6676 SourceLocation ClassLoc = ClassDecl->getLocation(); 6677 DeclarationNameInfo NameInfo(Name, ClassLoc); 6678 CXXMethodDecl *CopyAssignment 6679 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6680 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6681 /*TInfo=*/0, /*isStatic=*/false, 6682 /*StorageClassAsWritten=*/SC_None, 6683 /*isInline=*/true, 6684 SourceLocation()); 6685 CopyAssignment->setAccess(AS_public); 6686 CopyAssignment->setDefaulted(); 6687 CopyAssignment->setImplicit(); 6688 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6689 6690 // Add the parameter to the operator. 6691 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6692 ClassLoc, ClassLoc, /*Id=*/0, 6693 ArgType, /*TInfo=*/0, 6694 SC_None, 6695 SC_None, 0); 6696 CopyAssignment->setParams(&FromParam, 1); 6697 6698 // Note that we have added this copy-assignment operator. 6699 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6700 6701 if (Scope *S = getScopeForContext(ClassDecl)) 6702 PushOnScopeChains(CopyAssignment, S, false); 6703 ClassDecl->addDecl(CopyAssignment); 6704 6705 if (ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6706 CopyAssignment->setDeletedAsWritten(); 6707 6708 AddOverriddenMethods(ClassDecl, CopyAssignment); 6709 return CopyAssignment; 6710} 6711 6712void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6713 CXXMethodDecl *CopyAssignOperator) { 6714 assert((CopyAssignOperator->isDefaulted() && 6715 CopyAssignOperator->isOverloadedOperator() && 6716 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6717 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6718 "DefineImplicitCopyAssignment called for wrong function"); 6719 6720 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6721 6722 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6723 CopyAssignOperator->setInvalidDecl(); 6724 return; 6725 } 6726 6727 CopyAssignOperator->setUsed(); 6728 6729 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6730 DiagnosticErrorTrap Trap(Diags); 6731 6732 // C++0x [class.copy]p30: 6733 // The implicitly-defined or explicitly-defaulted copy assignment operator 6734 // for a non-union class X performs memberwise copy assignment of its 6735 // subobjects. The direct base classes of X are assigned first, in the 6736 // order of their declaration in the base-specifier-list, and then the 6737 // immediate non-static data members of X are assigned, in the order in 6738 // which they were declared in the class definition. 6739 6740 // The statements that form the synthesized function body. 6741 ASTOwningVector<Stmt*> Statements(*this); 6742 6743 // The parameter for the "other" object, which we are copying from. 6744 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6745 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6746 QualType OtherRefType = Other->getType(); 6747 if (const LValueReferenceType *OtherRef 6748 = OtherRefType->getAs<LValueReferenceType>()) { 6749 OtherRefType = OtherRef->getPointeeType(); 6750 OtherQuals = OtherRefType.getQualifiers(); 6751 } 6752 6753 // Our location for everything implicitly-generated. 6754 SourceLocation Loc = CopyAssignOperator->getLocation(); 6755 6756 // Construct a reference to the "other" object. We'll be using this 6757 // throughout the generated ASTs. 6758 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6759 assert(OtherRef && "Reference to parameter cannot fail!"); 6760 6761 // Construct the "this" pointer. We'll be using this throughout the generated 6762 // ASTs. 6763 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6764 assert(This && "Reference to this cannot fail!"); 6765 6766 // Assign base classes. 6767 bool Invalid = false; 6768 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6769 E = ClassDecl->bases_end(); Base != E; ++Base) { 6770 // Form the assignment: 6771 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6772 QualType BaseType = Base->getType().getUnqualifiedType(); 6773 if (!BaseType->isRecordType()) { 6774 Invalid = true; 6775 continue; 6776 } 6777 6778 CXXCastPath BasePath; 6779 BasePath.push_back(Base); 6780 6781 // Construct the "from" expression, which is an implicit cast to the 6782 // appropriately-qualified base type. 6783 Expr *From = OtherRef; 6784 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6785 CK_UncheckedDerivedToBase, 6786 VK_LValue, &BasePath).take(); 6787 6788 // Dereference "this". 6789 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6790 6791 // Implicitly cast "this" to the appropriately-qualified base type. 6792 To = ImpCastExprToType(To.take(), 6793 Context.getCVRQualifiedType(BaseType, 6794 CopyAssignOperator->getTypeQualifiers()), 6795 CK_UncheckedDerivedToBase, 6796 VK_LValue, &BasePath); 6797 6798 // Build the copy. 6799 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6800 To.get(), From, 6801 /*CopyingBaseSubobject=*/true); 6802 if (Copy.isInvalid()) { 6803 Diag(CurrentLocation, diag::note_member_synthesized_at) 6804 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6805 CopyAssignOperator->setInvalidDecl(); 6806 return; 6807 } 6808 6809 // Success! Record the copy. 6810 Statements.push_back(Copy.takeAs<Expr>()); 6811 } 6812 6813 // \brief Reference to the __builtin_memcpy function. 6814 Expr *BuiltinMemCpyRef = 0; 6815 // \brief Reference to the __builtin_objc_memmove_collectable function. 6816 Expr *CollectableMemCpyRef = 0; 6817 6818 // Assign non-static members. 6819 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6820 FieldEnd = ClassDecl->field_end(); 6821 Field != FieldEnd; ++Field) { 6822 // Check for members of reference type; we can't copy those. 6823 if (Field->getType()->isReferenceType()) { 6824 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6825 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6826 Diag(Field->getLocation(), diag::note_declared_at); 6827 Diag(CurrentLocation, diag::note_member_synthesized_at) 6828 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6829 Invalid = true; 6830 continue; 6831 } 6832 6833 // Check for members of const-qualified, non-class type. 6834 QualType BaseType = Context.getBaseElementType(Field->getType()); 6835 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6836 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6837 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6838 Diag(Field->getLocation(), diag::note_declared_at); 6839 Diag(CurrentLocation, diag::note_member_synthesized_at) 6840 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6841 Invalid = true; 6842 continue; 6843 } 6844 6845 QualType FieldType = Field->getType().getNonReferenceType(); 6846 if (FieldType->isIncompleteArrayType()) { 6847 assert(ClassDecl->hasFlexibleArrayMember() && 6848 "Incomplete array type is not valid"); 6849 continue; 6850 } 6851 6852 // Build references to the field in the object we're copying from and to. 6853 CXXScopeSpec SS; // Intentionally empty 6854 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6855 LookupMemberName); 6856 MemberLookup.addDecl(*Field); 6857 MemberLookup.resolveKind(); 6858 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6859 Loc, /*IsArrow=*/false, 6860 SS, 0, MemberLookup, 0); 6861 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6862 Loc, /*IsArrow=*/true, 6863 SS, 0, MemberLookup, 0); 6864 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6865 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6866 6867 // If the field should be copied with __builtin_memcpy rather than via 6868 // explicit assignments, do so. This optimization only applies for arrays 6869 // of scalars and arrays of class type with trivial copy-assignment 6870 // operators. 6871 if (FieldType->isArrayType() && 6872 (!BaseType->isRecordType() || 6873 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6874 ->hasTrivialCopyAssignment())) { 6875 // Compute the size of the memory buffer to be copied. 6876 QualType SizeType = Context.getSizeType(); 6877 llvm::APInt Size(Context.getTypeSize(SizeType), 6878 Context.getTypeSizeInChars(BaseType).getQuantity()); 6879 for (const ConstantArrayType *Array 6880 = Context.getAsConstantArrayType(FieldType); 6881 Array; 6882 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6883 llvm::APInt ArraySize 6884 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6885 Size *= ArraySize; 6886 } 6887 6888 // Take the address of the field references for "from" and "to". 6889 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6890 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6891 6892 bool NeedsCollectableMemCpy = 6893 (BaseType->isRecordType() && 6894 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6895 6896 if (NeedsCollectableMemCpy) { 6897 if (!CollectableMemCpyRef) { 6898 // Create a reference to the __builtin_objc_memmove_collectable function. 6899 LookupResult R(*this, 6900 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6901 Loc, LookupOrdinaryName); 6902 LookupName(R, TUScope, true); 6903 6904 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6905 if (!CollectableMemCpy) { 6906 // Something went horribly wrong earlier, and we will have 6907 // complained about it. 6908 Invalid = true; 6909 continue; 6910 } 6911 6912 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6913 CollectableMemCpy->getType(), 6914 VK_LValue, Loc, 0).take(); 6915 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6916 } 6917 } 6918 // Create a reference to the __builtin_memcpy builtin function. 6919 else if (!BuiltinMemCpyRef) { 6920 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6921 LookupOrdinaryName); 6922 LookupName(R, TUScope, true); 6923 6924 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6925 if (!BuiltinMemCpy) { 6926 // Something went horribly wrong earlier, and we will have complained 6927 // about it. 6928 Invalid = true; 6929 continue; 6930 } 6931 6932 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6933 BuiltinMemCpy->getType(), 6934 VK_LValue, Loc, 0).take(); 6935 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6936 } 6937 6938 ASTOwningVector<Expr*> CallArgs(*this); 6939 CallArgs.push_back(To.takeAs<Expr>()); 6940 CallArgs.push_back(From.takeAs<Expr>()); 6941 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6942 ExprResult Call = ExprError(); 6943 if (NeedsCollectableMemCpy) 6944 Call = ActOnCallExpr(/*Scope=*/0, 6945 CollectableMemCpyRef, 6946 Loc, move_arg(CallArgs), 6947 Loc); 6948 else 6949 Call = ActOnCallExpr(/*Scope=*/0, 6950 BuiltinMemCpyRef, 6951 Loc, move_arg(CallArgs), 6952 Loc); 6953 6954 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6955 Statements.push_back(Call.takeAs<Expr>()); 6956 continue; 6957 } 6958 6959 // Build the copy of this field. 6960 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6961 To.get(), From.get(), 6962 /*CopyingBaseSubobject=*/false); 6963 if (Copy.isInvalid()) { 6964 Diag(CurrentLocation, diag::note_member_synthesized_at) 6965 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6966 CopyAssignOperator->setInvalidDecl(); 6967 return; 6968 } 6969 6970 // Success! Record the copy. 6971 Statements.push_back(Copy.takeAs<Stmt>()); 6972 } 6973 6974 if (!Invalid) { 6975 // Add a "return *this;" 6976 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6977 6978 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6979 if (Return.isInvalid()) 6980 Invalid = true; 6981 else { 6982 Statements.push_back(Return.takeAs<Stmt>()); 6983 6984 if (Trap.hasErrorOccurred()) { 6985 Diag(CurrentLocation, diag::note_member_synthesized_at) 6986 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6987 Invalid = true; 6988 } 6989 } 6990 } 6991 6992 if (Invalid) { 6993 CopyAssignOperator->setInvalidDecl(); 6994 return; 6995 } 6996 6997 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6998 /*isStmtExpr=*/false); 6999 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7000 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7001 7002 if (ASTMutationListener *L = getASTMutationListener()) { 7003 L->CompletedImplicitDefinition(CopyAssignOperator); 7004 } 7005} 7006 7007std::pair<Sema::ImplicitExceptionSpecification, bool> 7008Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7009 // C++ [class.copy]p5: 7010 // The implicitly-declared copy constructor for a class X will 7011 // have the form 7012 // 7013 // X::X(const X&) 7014 // 7015 // if 7016 // FIXME: It ought to be possible to store this on the record. 7017 bool HasConstCopyConstructor = true; 7018 7019 // -- each direct or virtual base class B of X has a copy 7020 // constructor whose first parameter is of type const B& or 7021 // const volatile B&, and 7022 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7023 BaseEnd = ClassDecl->bases_end(); 7024 HasConstCopyConstructor && Base != BaseEnd; 7025 ++Base) { 7026 // Virtual bases are handled below. 7027 if (Base->isVirtual()) 7028 continue; 7029 7030 CXXRecordDecl *BaseClassDecl 7031 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7032 LookupCopyConstructor(BaseClassDecl, Qualifiers::Const, 7033 &HasConstCopyConstructor); 7034 } 7035 7036 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7037 BaseEnd = ClassDecl->vbases_end(); 7038 HasConstCopyConstructor && Base != BaseEnd; 7039 ++Base) { 7040 CXXRecordDecl *BaseClassDecl 7041 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7042 LookupCopyConstructor(BaseClassDecl, Qualifiers::Const, 7043 &HasConstCopyConstructor); 7044 } 7045 7046 // -- for all the nonstatic data members of X that are of a 7047 // class type M (or array thereof), each such class type 7048 // has a copy constructor whose first parameter is of type 7049 // const M& or const volatile M&. 7050 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7051 FieldEnd = ClassDecl->field_end(); 7052 HasConstCopyConstructor && Field != FieldEnd; 7053 ++Field) { 7054 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7055 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7056 LookupCopyConstructor(FieldClassDecl, Qualifiers::Const, 7057 &HasConstCopyConstructor); 7058 } 7059 } 7060 // Otherwise, the implicitly declared copy constructor will have 7061 // the form 7062 // 7063 // X::X(X&) 7064 7065 // C++ [except.spec]p14: 7066 // An implicitly declared special member function (Clause 12) shall have an 7067 // exception-specification. [...] 7068 ImplicitExceptionSpecification ExceptSpec(Context); 7069 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7070 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7071 BaseEnd = ClassDecl->bases_end(); 7072 Base != BaseEnd; 7073 ++Base) { 7074 // Virtual bases are handled below. 7075 if (Base->isVirtual()) 7076 continue; 7077 7078 CXXRecordDecl *BaseClassDecl 7079 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7080 if (CXXConstructorDecl *CopyConstructor = 7081 LookupCopyConstructor(BaseClassDecl, Quals)) 7082 ExceptSpec.CalledDecl(CopyConstructor); 7083 } 7084 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7085 BaseEnd = ClassDecl->vbases_end(); 7086 Base != BaseEnd; 7087 ++Base) { 7088 CXXRecordDecl *BaseClassDecl 7089 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7090 if (CXXConstructorDecl *CopyConstructor = 7091 LookupCopyConstructor(BaseClassDecl, Quals)) 7092 ExceptSpec.CalledDecl(CopyConstructor); 7093 } 7094 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7095 FieldEnd = ClassDecl->field_end(); 7096 Field != FieldEnd; 7097 ++Field) { 7098 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7099 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7100 if (CXXConstructorDecl *CopyConstructor = 7101 LookupCopyConstructor(FieldClassDecl, Quals)) 7102 ExceptSpec.CalledDecl(CopyConstructor); 7103 } 7104 } 7105 7106 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7107} 7108 7109CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7110 CXXRecordDecl *ClassDecl) { 7111 // C++ [class.copy]p4: 7112 // If the class definition does not explicitly declare a copy 7113 // constructor, one is declared implicitly. 7114 7115 ImplicitExceptionSpecification Spec(Context); 7116 bool Const; 7117 llvm::tie(Spec, Const) = 7118 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7119 7120 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7121 QualType ArgType = ClassType; 7122 if (Const) 7123 ArgType = ArgType.withConst(); 7124 ArgType = Context.getLValueReferenceType(ArgType); 7125 7126 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7127 7128 DeclarationName Name 7129 = Context.DeclarationNames.getCXXConstructorName( 7130 Context.getCanonicalType(ClassType)); 7131 SourceLocation ClassLoc = ClassDecl->getLocation(); 7132 DeclarationNameInfo NameInfo(Name, ClassLoc); 7133 7134 // An implicitly-declared copy constructor is an inline public 7135 // member of its class. 7136 CXXConstructorDecl *CopyConstructor 7137 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7138 Context.getFunctionType(Context.VoidTy, 7139 &ArgType, 1, EPI), 7140 /*TInfo=*/0, 7141 /*isExplicit=*/false, 7142 /*isInline=*/true, 7143 /*isImplicitlyDeclared=*/true); 7144 CopyConstructor->setAccess(AS_public); 7145 CopyConstructor->setDefaulted(); 7146 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7147 7148 // Note that we have declared this constructor. 7149 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7150 7151 // Add the parameter to the constructor. 7152 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7153 ClassLoc, ClassLoc, 7154 /*IdentifierInfo=*/0, 7155 ArgType, /*TInfo=*/0, 7156 SC_None, 7157 SC_None, 0); 7158 CopyConstructor->setParams(&FromParam, 1); 7159 7160 if (Scope *S = getScopeForContext(ClassDecl)) 7161 PushOnScopeChains(CopyConstructor, S, false); 7162 ClassDecl->addDecl(CopyConstructor); 7163 7164 if (ShouldDeleteCopyConstructor(CopyConstructor)) 7165 CopyConstructor->setDeletedAsWritten(); 7166 7167 return CopyConstructor; 7168} 7169 7170void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7171 CXXConstructorDecl *CopyConstructor) { 7172 assert((CopyConstructor->isDefaulted() && 7173 CopyConstructor->isCopyConstructor() && 7174 !CopyConstructor->doesThisDeclarationHaveABody()) && 7175 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7176 7177 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7178 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7179 7180 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7181 DiagnosticErrorTrap Trap(Diags); 7182 7183 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7184 Trap.hasErrorOccurred()) { 7185 Diag(CurrentLocation, diag::note_member_synthesized_at) 7186 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7187 CopyConstructor->setInvalidDecl(); 7188 } else { 7189 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7190 CopyConstructor->getLocation(), 7191 MultiStmtArg(*this, 0, 0), 7192 /*isStmtExpr=*/false) 7193 .takeAs<Stmt>()); 7194 } 7195 7196 CopyConstructor->setUsed(); 7197 7198 if (ASTMutationListener *L = getASTMutationListener()) { 7199 L->CompletedImplicitDefinition(CopyConstructor); 7200 } 7201} 7202 7203ExprResult 7204Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7205 CXXConstructorDecl *Constructor, 7206 MultiExprArg ExprArgs, 7207 bool RequiresZeroInit, 7208 unsigned ConstructKind, 7209 SourceRange ParenRange) { 7210 bool Elidable = false; 7211 7212 // C++0x [class.copy]p34: 7213 // When certain criteria are met, an implementation is allowed to 7214 // omit the copy/move construction of a class object, even if the 7215 // copy/move constructor and/or destructor for the object have 7216 // side effects. [...] 7217 // - when a temporary class object that has not been bound to a 7218 // reference (12.2) would be copied/moved to a class object 7219 // with the same cv-unqualified type, the copy/move operation 7220 // can be omitted by constructing the temporary object 7221 // directly into the target of the omitted copy/move 7222 if (ConstructKind == CXXConstructExpr::CK_Complete && 7223 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7224 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7225 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7226 } 7227 7228 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7229 Elidable, move(ExprArgs), RequiresZeroInit, 7230 ConstructKind, ParenRange); 7231} 7232 7233/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7234/// including handling of its default argument expressions. 7235ExprResult 7236Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7237 CXXConstructorDecl *Constructor, bool Elidable, 7238 MultiExprArg ExprArgs, 7239 bool RequiresZeroInit, 7240 unsigned ConstructKind, 7241 SourceRange ParenRange) { 7242 unsigned NumExprs = ExprArgs.size(); 7243 Expr **Exprs = (Expr **)ExprArgs.release(); 7244 7245 for (specific_attr_iterator<NonNullAttr> 7246 i = Constructor->specific_attr_begin<NonNullAttr>(), 7247 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7248 const NonNullAttr *NonNull = *i; 7249 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7250 } 7251 7252 MarkDeclarationReferenced(ConstructLoc, Constructor); 7253 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7254 Constructor, Elidable, Exprs, NumExprs, 7255 RequiresZeroInit, 7256 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7257 ParenRange)); 7258} 7259 7260bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7261 CXXConstructorDecl *Constructor, 7262 MultiExprArg Exprs) { 7263 // FIXME: Provide the correct paren SourceRange when available. 7264 ExprResult TempResult = 7265 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7266 move(Exprs), false, CXXConstructExpr::CK_Complete, 7267 SourceRange()); 7268 if (TempResult.isInvalid()) 7269 return true; 7270 7271 Expr *Temp = TempResult.takeAs<Expr>(); 7272 CheckImplicitConversions(Temp, VD->getLocation()); 7273 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7274 Temp = MaybeCreateExprWithCleanups(Temp); 7275 VD->setInit(Temp); 7276 7277 return false; 7278} 7279 7280void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7281 if (VD->isInvalidDecl()) return; 7282 7283 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7284 if (ClassDecl->isInvalidDecl()) return; 7285 if (ClassDecl->hasTrivialDestructor()) return; 7286 if (ClassDecl->isDependentContext()) return; 7287 7288 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7289 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7290 CheckDestructorAccess(VD->getLocation(), Destructor, 7291 PDiag(diag::err_access_dtor_var) 7292 << VD->getDeclName() 7293 << VD->getType()); 7294 7295 if (!VD->hasGlobalStorage()) return; 7296 7297 // Emit warning for non-trivial dtor in global scope (a real global, 7298 // class-static, function-static). 7299 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7300 7301 // TODO: this should be re-enabled for static locals by !CXAAtExit 7302 if (!VD->isStaticLocal()) 7303 Diag(VD->getLocation(), diag::warn_global_destructor); 7304} 7305 7306/// AddCXXDirectInitializerToDecl - This action is called immediately after 7307/// ActOnDeclarator, when a C++ direct initializer is present. 7308/// e.g: "int x(1);" 7309void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7310 SourceLocation LParenLoc, 7311 MultiExprArg Exprs, 7312 SourceLocation RParenLoc, 7313 bool TypeMayContainAuto) { 7314 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7315 7316 // If there is no declaration, there was an error parsing it. Just ignore 7317 // the initializer. 7318 if (RealDecl == 0) 7319 return; 7320 7321 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7322 if (!VDecl) { 7323 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7324 RealDecl->setInvalidDecl(); 7325 return; 7326 } 7327 7328 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7329 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7330 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7331 if (Exprs.size() > 1) { 7332 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7333 diag::err_auto_var_init_multiple_expressions) 7334 << VDecl->getDeclName() << VDecl->getType() 7335 << VDecl->getSourceRange(); 7336 RealDecl->setInvalidDecl(); 7337 return; 7338 } 7339 7340 Expr *Init = Exprs.get()[0]; 7341 TypeSourceInfo *DeducedType = 0; 7342 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7343 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7344 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7345 << Init->getSourceRange(); 7346 if (!DeducedType) { 7347 RealDecl->setInvalidDecl(); 7348 return; 7349 } 7350 VDecl->setTypeSourceInfo(DeducedType); 7351 VDecl->setType(DeducedType->getType()); 7352 7353 // If this is a redeclaration, check that the type we just deduced matches 7354 // the previously declared type. 7355 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7356 MergeVarDeclTypes(VDecl, Old); 7357 } 7358 7359 // We will represent direct-initialization similarly to copy-initialization: 7360 // int x(1); -as-> int x = 1; 7361 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7362 // 7363 // Clients that want to distinguish between the two forms, can check for 7364 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7365 // A major benefit is that clients that don't particularly care about which 7366 // exactly form was it (like the CodeGen) can handle both cases without 7367 // special case code. 7368 7369 // C++ 8.5p11: 7370 // The form of initialization (using parentheses or '=') is generally 7371 // insignificant, but does matter when the entity being initialized has a 7372 // class type. 7373 7374 if (!VDecl->getType()->isDependentType() && 7375 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7376 diag::err_typecheck_decl_incomplete_type)) { 7377 VDecl->setInvalidDecl(); 7378 return; 7379 } 7380 7381 // The variable can not have an abstract class type. 7382 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7383 diag::err_abstract_type_in_decl, 7384 AbstractVariableType)) 7385 VDecl->setInvalidDecl(); 7386 7387 const VarDecl *Def; 7388 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7389 Diag(VDecl->getLocation(), diag::err_redefinition) 7390 << VDecl->getDeclName(); 7391 Diag(Def->getLocation(), diag::note_previous_definition); 7392 VDecl->setInvalidDecl(); 7393 return; 7394 } 7395 7396 // C++ [class.static.data]p4 7397 // If a static data member is of const integral or const 7398 // enumeration type, its declaration in the class definition can 7399 // specify a constant-initializer which shall be an integral 7400 // constant expression (5.19). In that case, the member can appear 7401 // in integral constant expressions. The member shall still be 7402 // defined in a namespace scope if it is used in the program and the 7403 // namespace scope definition shall not contain an initializer. 7404 // 7405 // We already performed a redefinition check above, but for static 7406 // data members we also need to check whether there was an in-class 7407 // declaration with an initializer. 7408 const VarDecl* PrevInit = 0; 7409 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7410 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7411 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7412 return; 7413 } 7414 7415 bool IsDependent = false; 7416 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7417 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7418 VDecl->setInvalidDecl(); 7419 return; 7420 } 7421 7422 if (Exprs.get()[I]->isTypeDependent()) 7423 IsDependent = true; 7424 } 7425 7426 // If either the declaration has a dependent type or if any of the 7427 // expressions is type-dependent, we represent the initialization 7428 // via a ParenListExpr for later use during template instantiation. 7429 if (VDecl->getType()->isDependentType() || IsDependent) { 7430 // Let clients know that initialization was done with a direct initializer. 7431 VDecl->setCXXDirectInitializer(true); 7432 7433 // Store the initialization expressions as a ParenListExpr. 7434 unsigned NumExprs = Exprs.size(); 7435 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 7436 (Expr **)Exprs.release(), 7437 NumExprs, RParenLoc)); 7438 return; 7439 } 7440 7441 // Capture the variable that is being initialized and the style of 7442 // initialization. 7443 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7444 7445 // FIXME: Poor source location information. 7446 InitializationKind Kind 7447 = InitializationKind::CreateDirect(VDecl->getLocation(), 7448 LParenLoc, RParenLoc); 7449 7450 InitializationSequence InitSeq(*this, Entity, Kind, 7451 Exprs.get(), Exprs.size()); 7452 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7453 if (Result.isInvalid()) { 7454 VDecl->setInvalidDecl(); 7455 return; 7456 } 7457 7458 CheckImplicitConversions(Result.get(), LParenLoc); 7459 7460 Result = MaybeCreateExprWithCleanups(Result); 7461 VDecl->setInit(Result.takeAs<Expr>()); 7462 VDecl->setCXXDirectInitializer(true); 7463 7464 CheckCompleteVariableDeclaration(VDecl); 7465} 7466 7467/// \brief Given a constructor and the set of arguments provided for the 7468/// constructor, convert the arguments and add any required default arguments 7469/// to form a proper call to this constructor. 7470/// 7471/// \returns true if an error occurred, false otherwise. 7472bool 7473Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7474 MultiExprArg ArgsPtr, 7475 SourceLocation Loc, 7476 ASTOwningVector<Expr*> &ConvertedArgs) { 7477 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7478 unsigned NumArgs = ArgsPtr.size(); 7479 Expr **Args = (Expr **)ArgsPtr.get(); 7480 7481 const FunctionProtoType *Proto 7482 = Constructor->getType()->getAs<FunctionProtoType>(); 7483 assert(Proto && "Constructor without a prototype?"); 7484 unsigned NumArgsInProto = Proto->getNumArgs(); 7485 7486 // If too few arguments are available, we'll fill in the rest with defaults. 7487 if (NumArgs < NumArgsInProto) 7488 ConvertedArgs.reserve(NumArgsInProto); 7489 else 7490 ConvertedArgs.reserve(NumArgs); 7491 7492 VariadicCallType CallType = 7493 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7494 llvm::SmallVector<Expr *, 8> AllArgs; 7495 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7496 Proto, 0, Args, NumArgs, AllArgs, 7497 CallType); 7498 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7499 ConvertedArgs.push_back(AllArgs[i]); 7500 return Invalid; 7501} 7502 7503static inline bool 7504CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7505 const FunctionDecl *FnDecl) { 7506 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7507 if (isa<NamespaceDecl>(DC)) { 7508 return SemaRef.Diag(FnDecl->getLocation(), 7509 diag::err_operator_new_delete_declared_in_namespace) 7510 << FnDecl->getDeclName(); 7511 } 7512 7513 if (isa<TranslationUnitDecl>(DC) && 7514 FnDecl->getStorageClass() == SC_Static) { 7515 return SemaRef.Diag(FnDecl->getLocation(), 7516 diag::err_operator_new_delete_declared_static) 7517 << FnDecl->getDeclName(); 7518 } 7519 7520 return false; 7521} 7522 7523static inline bool 7524CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7525 CanQualType ExpectedResultType, 7526 CanQualType ExpectedFirstParamType, 7527 unsigned DependentParamTypeDiag, 7528 unsigned InvalidParamTypeDiag) { 7529 QualType ResultType = 7530 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7531 7532 // Check that the result type is not dependent. 7533 if (ResultType->isDependentType()) 7534 return SemaRef.Diag(FnDecl->getLocation(), 7535 diag::err_operator_new_delete_dependent_result_type) 7536 << FnDecl->getDeclName() << ExpectedResultType; 7537 7538 // Check that the result type is what we expect. 7539 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7540 return SemaRef.Diag(FnDecl->getLocation(), 7541 diag::err_operator_new_delete_invalid_result_type) 7542 << FnDecl->getDeclName() << ExpectedResultType; 7543 7544 // A function template must have at least 2 parameters. 7545 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7546 return SemaRef.Diag(FnDecl->getLocation(), 7547 diag::err_operator_new_delete_template_too_few_parameters) 7548 << FnDecl->getDeclName(); 7549 7550 // The function decl must have at least 1 parameter. 7551 if (FnDecl->getNumParams() == 0) 7552 return SemaRef.Diag(FnDecl->getLocation(), 7553 diag::err_operator_new_delete_too_few_parameters) 7554 << FnDecl->getDeclName(); 7555 7556 // Check the the first parameter type is not dependent. 7557 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7558 if (FirstParamType->isDependentType()) 7559 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7560 << FnDecl->getDeclName() << ExpectedFirstParamType; 7561 7562 // Check that the first parameter type is what we expect. 7563 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7564 ExpectedFirstParamType) 7565 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7566 << FnDecl->getDeclName() << ExpectedFirstParamType; 7567 7568 return false; 7569} 7570 7571static bool 7572CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7573 // C++ [basic.stc.dynamic.allocation]p1: 7574 // A program is ill-formed if an allocation function is declared in a 7575 // namespace scope other than global scope or declared static in global 7576 // scope. 7577 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7578 return true; 7579 7580 CanQualType SizeTy = 7581 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7582 7583 // C++ [basic.stc.dynamic.allocation]p1: 7584 // The return type shall be void*. The first parameter shall have type 7585 // std::size_t. 7586 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7587 SizeTy, 7588 diag::err_operator_new_dependent_param_type, 7589 diag::err_operator_new_param_type)) 7590 return true; 7591 7592 // C++ [basic.stc.dynamic.allocation]p1: 7593 // The first parameter shall not have an associated default argument. 7594 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7595 return SemaRef.Diag(FnDecl->getLocation(), 7596 diag::err_operator_new_default_arg) 7597 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7598 7599 return false; 7600} 7601 7602static bool 7603CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7604 // C++ [basic.stc.dynamic.deallocation]p1: 7605 // A program is ill-formed if deallocation functions are declared in a 7606 // namespace scope other than global scope or declared static in global 7607 // scope. 7608 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7609 return true; 7610 7611 // C++ [basic.stc.dynamic.deallocation]p2: 7612 // Each deallocation function shall return void and its first parameter 7613 // shall be void*. 7614 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7615 SemaRef.Context.VoidPtrTy, 7616 diag::err_operator_delete_dependent_param_type, 7617 diag::err_operator_delete_param_type)) 7618 return true; 7619 7620 return false; 7621} 7622 7623/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7624/// of this overloaded operator is well-formed. If so, returns false; 7625/// otherwise, emits appropriate diagnostics and returns true. 7626bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7627 assert(FnDecl && FnDecl->isOverloadedOperator() && 7628 "Expected an overloaded operator declaration"); 7629 7630 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7631 7632 // C++ [over.oper]p5: 7633 // The allocation and deallocation functions, operator new, 7634 // operator new[], operator delete and operator delete[], are 7635 // described completely in 3.7.3. The attributes and restrictions 7636 // found in the rest of this subclause do not apply to them unless 7637 // explicitly stated in 3.7.3. 7638 if (Op == OO_Delete || Op == OO_Array_Delete) 7639 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7640 7641 if (Op == OO_New || Op == OO_Array_New) 7642 return CheckOperatorNewDeclaration(*this, FnDecl); 7643 7644 // C++ [over.oper]p6: 7645 // An operator function shall either be a non-static member 7646 // function or be a non-member function and have at least one 7647 // parameter whose type is a class, a reference to a class, an 7648 // enumeration, or a reference to an enumeration. 7649 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7650 if (MethodDecl->isStatic()) 7651 return Diag(FnDecl->getLocation(), 7652 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7653 } else { 7654 bool ClassOrEnumParam = false; 7655 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7656 ParamEnd = FnDecl->param_end(); 7657 Param != ParamEnd; ++Param) { 7658 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7659 if (ParamType->isDependentType() || ParamType->isRecordType() || 7660 ParamType->isEnumeralType()) { 7661 ClassOrEnumParam = true; 7662 break; 7663 } 7664 } 7665 7666 if (!ClassOrEnumParam) 7667 return Diag(FnDecl->getLocation(), 7668 diag::err_operator_overload_needs_class_or_enum) 7669 << FnDecl->getDeclName(); 7670 } 7671 7672 // C++ [over.oper]p8: 7673 // An operator function cannot have default arguments (8.3.6), 7674 // except where explicitly stated below. 7675 // 7676 // Only the function-call operator allows default arguments 7677 // (C++ [over.call]p1). 7678 if (Op != OO_Call) { 7679 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7680 Param != FnDecl->param_end(); ++Param) { 7681 if ((*Param)->hasDefaultArg()) 7682 return Diag((*Param)->getLocation(), 7683 diag::err_operator_overload_default_arg) 7684 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7685 } 7686 } 7687 7688 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7689 { false, false, false } 7690#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7691 , { Unary, Binary, MemberOnly } 7692#include "clang/Basic/OperatorKinds.def" 7693 }; 7694 7695 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7696 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7697 bool MustBeMemberOperator = OperatorUses[Op][2]; 7698 7699 // C++ [over.oper]p8: 7700 // [...] Operator functions cannot have more or fewer parameters 7701 // than the number required for the corresponding operator, as 7702 // described in the rest of this subclause. 7703 unsigned NumParams = FnDecl->getNumParams() 7704 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7705 if (Op != OO_Call && 7706 ((NumParams == 1 && !CanBeUnaryOperator) || 7707 (NumParams == 2 && !CanBeBinaryOperator) || 7708 (NumParams < 1) || (NumParams > 2))) { 7709 // We have the wrong number of parameters. 7710 unsigned ErrorKind; 7711 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7712 ErrorKind = 2; // 2 -> unary or binary. 7713 } else if (CanBeUnaryOperator) { 7714 ErrorKind = 0; // 0 -> unary 7715 } else { 7716 assert(CanBeBinaryOperator && 7717 "All non-call overloaded operators are unary or binary!"); 7718 ErrorKind = 1; // 1 -> binary 7719 } 7720 7721 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7722 << FnDecl->getDeclName() << NumParams << ErrorKind; 7723 } 7724 7725 // Overloaded operators other than operator() cannot be variadic. 7726 if (Op != OO_Call && 7727 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7728 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7729 << FnDecl->getDeclName(); 7730 } 7731 7732 // Some operators must be non-static member functions. 7733 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7734 return Diag(FnDecl->getLocation(), 7735 diag::err_operator_overload_must_be_member) 7736 << FnDecl->getDeclName(); 7737 } 7738 7739 // C++ [over.inc]p1: 7740 // The user-defined function called operator++ implements the 7741 // prefix and postfix ++ operator. If this function is a member 7742 // function with no parameters, or a non-member function with one 7743 // parameter of class or enumeration type, it defines the prefix 7744 // increment operator ++ for objects of that type. If the function 7745 // is a member function with one parameter (which shall be of type 7746 // int) or a non-member function with two parameters (the second 7747 // of which shall be of type int), it defines the postfix 7748 // increment operator ++ for objects of that type. 7749 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7750 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7751 bool ParamIsInt = false; 7752 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7753 ParamIsInt = BT->getKind() == BuiltinType::Int; 7754 7755 if (!ParamIsInt) 7756 return Diag(LastParam->getLocation(), 7757 diag::err_operator_overload_post_incdec_must_be_int) 7758 << LastParam->getType() << (Op == OO_MinusMinus); 7759 } 7760 7761 return false; 7762} 7763 7764/// CheckLiteralOperatorDeclaration - Check whether the declaration 7765/// of this literal operator function is well-formed. If so, returns 7766/// false; otherwise, emits appropriate diagnostics and returns true. 7767bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7768 DeclContext *DC = FnDecl->getDeclContext(); 7769 Decl::Kind Kind = DC->getDeclKind(); 7770 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7771 Kind != Decl::LinkageSpec) { 7772 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7773 << FnDecl->getDeclName(); 7774 return true; 7775 } 7776 7777 bool Valid = false; 7778 7779 // template <char...> type operator "" name() is the only valid template 7780 // signature, and the only valid signature with no parameters. 7781 if (FnDecl->param_size() == 0) { 7782 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7783 // Must have only one template parameter 7784 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7785 if (Params->size() == 1) { 7786 NonTypeTemplateParmDecl *PmDecl = 7787 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7788 7789 // The template parameter must be a char parameter pack. 7790 if (PmDecl && PmDecl->isTemplateParameterPack() && 7791 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7792 Valid = true; 7793 } 7794 } 7795 } else { 7796 // Check the first parameter 7797 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7798 7799 QualType T = (*Param)->getType(); 7800 7801 // unsigned long long int, long double, and any character type are allowed 7802 // as the only parameters. 7803 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7804 Context.hasSameType(T, Context.LongDoubleTy) || 7805 Context.hasSameType(T, Context.CharTy) || 7806 Context.hasSameType(T, Context.WCharTy) || 7807 Context.hasSameType(T, Context.Char16Ty) || 7808 Context.hasSameType(T, Context.Char32Ty)) { 7809 if (++Param == FnDecl->param_end()) 7810 Valid = true; 7811 goto FinishedParams; 7812 } 7813 7814 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7815 const PointerType *PT = T->getAs<PointerType>(); 7816 if (!PT) 7817 goto FinishedParams; 7818 T = PT->getPointeeType(); 7819 if (!T.isConstQualified()) 7820 goto FinishedParams; 7821 T = T.getUnqualifiedType(); 7822 7823 // Move on to the second parameter; 7824 ++Param; 7825 7826 // If there is no second parameter, the first must be a const char * 7827 if (Param == FnDecl->param_end()) { 7828 if (Context.hasSameType(T, Context.CharTy)) 7829 Valid = true; 7830 goto FinishedParams; 7831 } 7832 7833 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7834 // are allowed as the first parameter to a two-parameter function 7835 if (!(Context.hasSameType(T, Context.CharTy) || 7836 Context.hasSameType(T, Context.WCharTy) || 7837 Context.hasSameType(T, Context.Char16Ty) || 7838 Context.hasSameType(T, Context.Char32Ty))) 7839 goto FinishedParams; 7840 7841 // The second and final parameter must be an std::size_t 7842 T = (*Param)->getType().getUnqualifiedType(); 7843 if (Context.hasSameType(T, Context.getSizeType()) && 7844 ++Param == FnDecl->param_end()) 7845 Valid = true; 7846 } 7847 7848 // FIXME: This diagnostic is absolutely terrible. 7849FinishedParams: 7850 if (!Valid) { 7851 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7852 << FnDecl->getDeclName(); 7853 return true; 7854 } 7855 7856 return false; 7857} 7858 7859/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7860/// linkage specification, including the language and (if present) 7861/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7862/// the location of the language string literal, which is provided 7863/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7864/// the '{' brace. Otherwise, this linkage specification does not 7865/// have any braces. 7866Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7867 SourceLocation LangLoc, 7868 llvm::StringRef Lang, 7869 SourceLocation LBraceLoc) { 7870 LinkageSpecDecl::LanguageIDs Language; 7871 if (Lang == "\"C\"") 7872 Language = LinkageSpecDecl::lang_c; 7873 else if (Lang == "\"C++\"") 7874 Language = LinkageSpecDecl::lang_cxx; 7875 else { 7876 Diag(LangLoc, diag::err_bad_language); 7877 return 0; 7878 } 7879 7880 // FIXME: Add all the various semantics of linkage specifications 7881 7882 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7883 ExternLoc, LangLoc, Language); 7884 CurContext->addDecl(D); 7885 PushDeclContext(S, D); 7886 return D; 7887} 7888 7889/// ActOnFinishLinkageSpecification - Complete the definition of 7890/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7891/// valid, it's the position of the closing '}' brace in a linkage 7892/// specification that uses braces. 7893Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7894 Decl *LinkageSpec, 7895 SourceLocation RBraceLoc) { 7896 if (LinkageSpec) { 7897 if (RBraceLoc.isValid()) { 7898 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7899 LSDecl->setRBraceLoc(RBraceLoc); 7900 } 7901 PopDeclContext(); 7902 } 7903 return LinkageSpec; 7904} 7905 7906/// \brief Perform semantic analysis for the variable declaration that 7907/// occurs within a C++ catch clause, returning the newly-created 7908/// variable. 7909VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7910 TypeSourceInfo *TInfo, 7911 SourceLocation StartLoc, 7912 SourceLocation Loc, 7913 IdentifierInfo *Name) { 7914 bool Invalid = false; 7915 QualType ExDeclType = TInfo->getType(); 7916 7917 // Arrays and functions decay. 7918 if (ExDeclType->isArrayType()) 7919 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7920 else if (ExDeclType->isFunctionType()) 7921 ExDeclType = Context.getPointerType(ExDeclType); 7922 7923 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7924 // The exception-declaration shall not denote a pointer or reference to an 7925 // incomplete type, other than [cv] void*. 7926 // N2844 forbids rvalue references. 7927 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7928 Diag(Loc, diag::err_catch_rvalue_ref); 7929 Invalid = true; 7930 } 7931 7932 // GCC allows catching pointers and references to incomplete types 7933 // as an extension; so do we, but we warn by default. 7934 7935 QualType BaseType = ExDeclType; 7936 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7937 unsigned DK = diag::err_catch_incomplete; 7938 bool IncompleteCatchIsInvalid = true; 7939 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7940 BaseType = Ptr->getPointeeType(); 7941 Mode = 1; 7942 DK = diag::ext_catch_incomplete_ptr; 7943 IncompleteCatchIsInvalid = false; 7944 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7945 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7946 BaseType = Ref->getPointeeType(); 7947 Mode = 2; 7948 DK = diag::ext_catch_incomplete_ref; 7949 IncompleteCatchIsInvalid = false; 7950 } 7951 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7952 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7953 IncompleteCatchIsInvalid) 7954 Invalid = true; 7955 7956 if (!Invalid && !ExDeclType->isDependentType() && 7957 RequireNonAbstractType(Loc, ExDeclType, 7958 diag::err_abstract_type_in_decl, 7959 AbstractVariableType)) 7960 Invalid = true; 7961 7962 // Only the non-fragile NeXT runtime currently supports C++ catches 7963 // of ObjC types, and no runtime supports catching ObjC types by value. 7964 if (!Invalid && getLangOptions().ObjC1) { 7965 QualType T = ExDeclType; 7966 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7967 T = RT->getPointeeType(); 7968 7969 if (T->isObjCObjectType()) { 7970 Diag(Loc, diag::err_objc_object_catch); 7971 Invalid = true; 7972 } else if (T->isObjCObjectPointerType()) { 7973 if (!getLangOptions().ObjCNonFragileABI) { 7974 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7975 Invalid = true; 7976 } 7977 } 7978 } 7979 7980 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7981 ExDeclType, TInfo, SC_None, SC_None); 7982 ExDecl->setExceptionVariable(true); 7983 7984 if (!Invalid) { 7985 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7986 // C++ [except.handle]p16: 7987 // The object declared in an exception-declaration or, if the 7988 // exception-declaration does not specify a name, a temporary (12.2) is 7989 // copy-initialized (8.5) from the exception object. [...] 7990 // The object is destroyed when the handler exits, after the destruction 7991 // of any automatic objects initialized within the handler. 7992 // 7993 // We just pretend to initialize the object with itself, then make sure 7994 // it can be destroyed later. 7995 QualType initType = ExDeclType; 7996 7997 InitializedEntity entity = 7998 InitializedEntity::InitializeVariable(ExDecl); 7999 InitializationKind initKind = 8000 InitializationKind::CreateCopy(Loc, SourceLocation()); 8001 8002 Expr *opaqueValue = 8003 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8004 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8005 ExprResult result = sequence.Perform(*this, entity, initKind, 8006 MultiExprArg(&opaqueValue, 1)); 8007 if (result.isInvalid()) 8008 Invalid = true; 8009 else { 8010 // If the constructor used was non-trivial, set this as the 8011 // "initializer". 8012 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8013 if (!construct->getConstructor()->isTrivial()) { 8014 Expr *init = MaybeCreateExprWithCleanups(construct); 8015 ExDecl->setInit(init); 8016 } 8017 8018 // And make sure it's destructable. 8019 FinalizeVarWithDestructor(ExDecl, recordType); 8020 } 8021 } 8022 } 8023 8024 if (Invalid) 8025 ExDecl->setInvalidDecl(); 8026 8027 return ExDecl; 8028} 8029 8030/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8031/// handler. 8032Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8033 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8034 bool Invalid = D.isInvalidType(); 8035 8036 // Check for unexpanded parameter packs. 8037 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8038 UPPC_ExceptionType)) { 8039 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8040 D.getIdentifierLoc()); 8041 Invalid = true; 8042 } 8043 8044 IdentifierInfo *II = D.getIdentifier(); 8045 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8046 LookupOrdinaryName, 8047 ForRedeclaration)) { 8048 // The scope should be freshly made just for us. There is just no way 8049 // it contains any previous declaration. 8050 assert(!S->isDeclScope(PrevDecl)); 8051 if (PrevDecl->isTemplateParameter()) { 8052 // Maybe we will complain about the shadowed template parameter. 8053 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8054 } 8055 } 8056 8057 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8058 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8059 << D.getCXXScopeSpec().getRange(); 8060 Invalid = true; 8061 } 8062 8063 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8064 D.getSourceRange().getBegin(), 8065 D.getIdentifierLoc(), 8066 D.getIdentifier()); 8067 if (Invalid) 8068 ExDecl->setInvalidDecl(); 8069 8070 // Add the exception declaration into this scope. 8071 if (II) 8072 PushOnScopeChains(ExDecl, S); 8073 else 8074 CurContext->addDecl(ExDecl); 8075 8076 ProcessDeclAttributes(S, ExDecl, D); 8077 return ExDecl; 8078} 8079 8080Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8081 Expr *AssertExpr, 8082 Expr *AssertMessageExpr_, 8083 SourceLocation RParenLoc) { 8084 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8085 8086 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8087 llvm::APSInt Value(32); 8088 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8089 Diag(StaticAssertLoc, 8090 diag::err_static_assert_expression_is_not_constant) << 8091 AssertExpr->getSourceRange(); 8092 return 0; 8093 } 8094 8095 if (Value == 0) { 8096 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8097 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8098 } 8099 } 8100 8101 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8102 return 0; 8103 8104 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8105 AssertExpr, AssertMessage, RParenLoc); 8106 8107 CurContext->addDecl(Decl); 8108 return Decl; 8109} 8110 8111/// \brief Perform semantic analysis of the given friend type declaration. 8112/// 8113/// \returns A friend declaration that. 8114FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8115 TypeSourceInfo *TSInfo) { 8116 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8117 8118 QualType T = TSInfo->getType(); 8119 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8120 8121 if (!getLangOptions().CPlusPlus0x) { 8122 // C++03 [class.friend]p2: 8123 // An elaborated-type-specifier shall be used in a friend declaration 8124 // for a class.* 8125 // 8126 // * The class-key of the elaborated-type-specifier is required. 8127 if (!ActiveTemplateInstantiations.empty()) { 8128 // Do not complain about the form of friend template types during 8129 // template instantiation; we will already have complained when the 8130 // template was declared. 8131 } else if (!T->isElaboratedTypeSpecifier()) { 8132 // If we evaluated the type to a record type, suggest putting 8133 // a tag in front. 8134 if (const RecordType *RT = T->getAs<RecordType>()) { 8135 RecordDecl *RD = RT->getDecl(); 8136 8137 std::string InsertionText = std::string(" ") + RD->getKindName(); 8138 8139 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8140 << (unsigned) RD->getTagKind() 8141 << T 8142 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8143 InsertionText); 8144 } else { 8145 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8146 << T 8147 << SourceRange(FriendLoc, TypeRange.getEnd()); 8148 } 8149 } else if (T->getAs<EnumType>()) { 8150 Diag(FriendLoc, diag::ext_enum_friend) 8151 << T 8152 << SourceRange(FriendLoc, TypeRange.getEnd()); 8153 } 8154 } 8155 8156 // C++0x [class.friend]p3: 8157 // If the type specifier in a friend declaration designates a (possibly 8158 // cv-qualified) class type, that class is declared as a friend; otherwise, 8159 // the friend declaration is ignored. 8160 8161 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8162 // in [class.friend]p3 that we do not implement. 8163 8164 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8165} 8166 8167/// Handle a friend tag declaration where the scope specifier was 8168/// templated. 8169Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8170 unsigned TagSpec, SourceLocation TagLoc, 8171 CXXScopeSpec &SS, 8172 IdentifierInfo *Name, SourceLocation NameLoc, 8173 AttributeList *Attr, 8174 MultiTemplateParamsArg TempParamLists) { 8175 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8176 8177 bool isExplicitSpecialization = false; 8178 bool Invalid = false; 8179 8180 if (TemplateParameterList *TemplateParams 8181 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8182 TempParamLists.get(), 8183 TempParamLists.size(), 8184 /*friend*/ true, 8185 isExplicitSpecialization, 8186 Invalid)) { 8187 if (TemplateParams->size() > 0) { 8188 // This is a declaration of a class template. 8189 if (Invalid) 8190 return 0; 8191 8192 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8193 SS, Name, NameLoc, Attr, 8194 TemplateParams, AS_public, 8195 TempParamLists.size() - 1, 8196 (TemplateParameterList**) TempParamLists.release()).take(); 8197 } else { 8198 // The "template<>" header is extraneous. 8199 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8200 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8201 isExplicitSpecialization = true; 8202 } 8203 } 8204 8205 if (Invalid) return 0; 8206 8207 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8208 8209 bool isAllExplicitSpecializations = true; 8210 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8211 if (TempParamLists.get()[I]->size()) { 8212 isAllExplicitSpecializations = false; 8213 break; 8214 } 8215 } 8216 8217 // FIXME: don't ignore attributes. 8218 8219 // If it's explicit specializations all the way down, just forget 8220 // about the template header and build an appropriate non-templated 8221 // friend. TODO: for source fidelity, remember the headers. 8222 if (isAllExplicitSpecializations) { 8223 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8224 ElaboratedTypeKeyword Keyword 8225 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8226 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8227 *Name, NameLoc); 8228 if (T.isNull()) 8229 return 0; 8230 8231 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8232 if (isa<DependentNameType>(T)) { 8233 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8234 TL.setKeywordLoc(TagLoc); 8235 TL.setQualifierLoc(QualifierLoc); 8236 TL.setNameLoc(NameLoc); 8237 } else { 8238 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8239 TL.setKeywordLoc(TagLoc); 8240 TL.setQualifierLoc(QualifierLoc); 8241 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8242 } 8243 8244 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8245 TSI, FriendLoc); 8246 Friend->setAccess(AS_public); 8247 CurContext->addDecl(Friend); 8248 return Friend; 8249 } 8250 8251 // Handle the case of a templated-scope friend class. e.g. 8252 // template <class T> class A<T>::B; 8253 // FIXME: we don't support these right now. 8254 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8255 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8256 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8257 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8258 TL.setKeywordLoc(TagLoc); 8259 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8260 TL.setNameLoc(NameLoc); 8261 8262 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8263 TSI, FriendLoc); 8264 Friend->setAccess(AS_public); 8265 Friend->setUnsupportedFriend(true); 8266 CurContext->addDecl(Friend); 8267 return Friend; 8268} 8269 8270 8271/// Handle a friend type declaration. This works in tandem with 8272/// ActOnTag. 8273/// 8274/// Notes on friend class templates: 8275/// 8276/// We generally treat friend class declarations as if they were 8277/// declaring a class. So, for example, the elaborated type specifier 8278/// in a friend declaration is required to obey the restrictions of a 8279/// class-head (i.e. no typedefs in the scope chain), template 8280/// parameters are required to match up with simple template-ids, &c. 8281/// However, unlike when declaring a template specialization, it's 8282/// okay to refer to a template specialization without an empty 8283/// template parameter declaration, e.g. 8284/// friend class A<T>::B<unsigned>; 8285/// We permit this as a special case; if there are any template 8286/// parameters present at all, require proper matching, i.e. 8287/// template <> template <class T> friend class A<int>::B; 8288Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8289 MultiTemplateParamsArg TempParams) { 8290 SourceLocation Loc = DS.getSourceRange().getBegin(); 8291 8292 assert(DS.isFriendSpecified()); 8293 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8294 8295 // Try to convert the decl specifier to a type. This works for 8296 // friend templates because ActOnTag never produces a ClassTemplateDecl 8297 // for a TUK_Friend. 8298 Declarator TheDeclarator(DS, Declarator::MemberContext); 8299 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8300 QualType T = TSI->getType(); 8301 if (TheDeclarator.isInvalidType()) 8302 return 0; 8303 8304 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8305 return 0; 8306 8307 // This is definitely an error in C++98. It's probably meant to 8308 // be forbidden in C++0x, too, but the specification is just 8309 // poorly written. 8310 // 8311 // The problem is with declarations like the following: 8312 // template <T> friend A<T>::foo; 8313 // where deciding whether a class C is a friend or not now hinges 8314 // on whether there exists an instantiation of A that causes 8315 // 'foo' to equal C. There are restrictions on class-heads 8316 // (which we declare (by fiat) elaborated friend declarations to 8317 // be) that makes this tractable. 8318 // 8319 // FIXME: handle "template <> friend class A<T>;", which 8320 // is possibly well-formed? Who even knows? 8321 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8322 Diag(Loc, diag::err_tagless_friend_type_template) 8323 << DS.getSourceRange(); 8324 return 0; 8325 } 8326 8327 // C++98 [class.friend]p1: A friend of a class is a function 8328 // or class that is not a member of the class . . . 8329 // This is fixed in DR77, which just barely didn't make the C++03 8330 // deadline. It's also a very silly restriction that seriously 8331 // affects inner classes and which nobody else seems to implement; 8332 // thus we never diagnose it, not even in -pedantic. 8333 // 8334 // But note that we could warn about it: it's always useless to 8335 // friend one of your own members (it's not, however, worthless to 8336 // friend a member of an arbitrary specialization of your template). 8337 8338 Decl *D; 8339 if (unsigned NumTempParamLists = TempParams.size()) 8340 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8341 NumTempParamLists, 8342 TempParams.release(), 8343 TSI, 8344 DS.getFriendSpecLoc()); 8345 else 8346 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8347 8348 if (!D) 8349 return 0; 8350 8351 D->setAccess(AS_public); 8352 CurContext->addDecl(D); 8353 8354 return D; 8355} 8356 8357Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8358 MultiTemplateParamsArg TemplateParams) { 8359 const DeclSpec &DS = D.getDeclSpec(); 8360 8361 assert(DS.isFriendSpecified()); 8362 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8363 8364 SourceLocation Loc = D.getIdentifierLoc(); 8365 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8366 QualType T = TInfo->getType(); 8367 8368 // C++ [class.friend]p1 8369 // A friend of a class is a function or class.... 8370 // Note that this sees through typedefs, which is intended. 8371 // It *doesn't* see through dependent types, which is correct 8372 // according to [temp.arg.type]p3: 8373 // If a declaration acquires a function type through a 8374 // type dependent on a template-parameter and this causes 8375 // a declaration that does not use the syntactic form of a 8376 // function declarator to have a function type, the program 8377 // is ill-formed. 8378 if (!T->isFunctionType()) { 8379 Diag(Loc, diag::err_unexpected_friend); 8380 8381 // It might be worthwhile to try to recover by creating an 8382 // appropriate declaration. 8383 return 0; 8384 } 8385 8386 // C++ [namespace.memdef]p3 8387 // - If a friend declaration in a non-local class first declares a 8388 // class or function, the friend class or function is a member 8389 // of the innermost enclosing namespace. 8390 // - The name of the friend is not found by simple name lookup 8391 // until a matching declaration is provided in that namespace 8392 // scope (either before or after the class declaration granting 8393 // friendship). 8394 // - If a friend function is called, its name may be found by the 8395 // name lookup that considers functions from namespaces and 8396 // classes associated with the types of the function arguments. 8397 // - When looking for a prior declaration of a class or a function 8398 // declared as a friend, scopes outside the innermost enclosing 8399 // namespace scope are not considered. 8400 8401 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8402 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8403 DeclarationName Name = NameInfo.getName(); 8404 assert(Name); 8405 8406 // Check for unexpanded parameter packs. 8407 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8408 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8409 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8410 return 0; 8411 8412 // The context we found the declaration in, or in which we should 8413 // create the declaration. 8414 DeclContext *DC; 8415 Scope *DCScope = S; 8416 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8417 ForRedeclaration); 8418 8419 // FIXME: there are different rules in local classes 8420 8421 // There are four cases here. 8422 // - There's no scope specifier, in which case we just go to the 8423 // appropriate scope and look for a function or function template 8424 // there as appropriate. 8425 // Recover from invalid scope qualifiers as if they just weren't there. 8426 if (SS.isInvalid() || !SS.isSet()) { 8427 // C++0x [namespace.memdef]p3: 8428 // If the name in a friend declaration is neither qualified nor 8429 // a template-id and the declaration is a function or an 8430 // elaborated-type-specifier, the lookup to determine whether 8431 // the entity has been previously declared shall not consider 8432 // any scopes outside the innermost enclosing namespace. 8433 // C++0x [class.friend]p11: 8434 // If a friend declaration appears in a local class and the name 8435 // specified is an unqualified name, a prior declaration is 8436 // looked up without considering scopes that are outside the 8437 // innermost enclosing non-class scope. For a friend function 8438 // declaration, if there is no prior declaration, the program is 8439 // ill-formed. 8440 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8441 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8442 8443 // Find the appropriate context according to the above. 8444 DC = CurContext; 8445 while (true) { 8446 // Skip class contexts. If someone can cite chapter and verse 8447 // for this behavior, that would be nice --- it's what GCC and 8448 // EDG do, and it seems like a reasonable intent, but the spec 8449 // really only says that checks for unqualified existing 8450 // declarations should stop at the nearest enclosing namespace, 8451 // not that they should only consider the nearest enclosing 8452 // namespace. 8453 while (DC->isRecord()) 8454 DC = DC->getParent(); 8455 8456 LookupQualifiedName(Previous, DC); 8457 8458 // TODO: decide what we think about using declarations. 8459 if (isLocal || !Previous.empty()) 8460 break; 8461 8462 if (isTemplateId) { 8463 if (isa<TranslationUnitDecl>(DC)) break; 8464 } else { 8465 if (DC->isFileContext()) break; 8466 } 8467 DC = DC->getParent(); 8468 } 8469 8470 // C++ [class.friend]p1: A friend of a class is a function or 8471 // class that is not a member of the class . . . 8472 // C++0x changes this for both friend types and functions. 8473 // Most C++ 98 compilers do seem to give an error here, so 8474 // we do, too. 8475 if (!Previous.empty() && DC->Equals(CurContext) 8476 && !getLangOptions().CPlusPlus0x) 8477 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8478 8479 DCScope = getScopeForDeclContext(S, DC); 8480 8481 // - There's a non-dependent scope specifier, in which case we 8482 // compute it and do a previous lookup there for a function 8483 // or function template. 8484 } else if (!SS.getScopeRep()->isDependent()) { 8485 DC = computeDeclContext(SS); 8486 if (!DC) return 0; 8487 8488 if (RequireCompleteDeclContext(SS, DC)) return 0; 8489 8490 LookupQualifiedName(Previous, DC); 8491 8492 // Ignore things found implicitly in the wrong scope. 8493 // TODO: better diagnostics for this case. Suggesting the right 8494 // qualified scope would be nice... 8495 LookupResult::Filter F = Previous.makeFilter(); 8496 while (F.hasNext()) { 8497 NamedDecl *D = F.next(); 8498 if (!DC->InEnclosingNamespaceSetOf( 8499 D->getDeclContext()->getRedeclContext())) 8500 F.erase(); 8501 } 8502 F.done(); 8503 8504 if (Previous.empty()) { 8505 D.setInvalidType(); 8506 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8507 return 0; 8508 } 8509 8510 // C++ [class.friend]p1: A friend of a class is a function or 8511 // class that is not a member of the class . . . 8512 if (DC->Equals(CurContext)) 8513 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8514 8515 // - There's a scope specifier that does not match any template 8516 // parameter lists, in which case we use some arbitrary context, 8517 // create a method or method template, and wait for instantiation. 8518 // - There's a scope specifier that does match some template 8519 // parameter lists, which we don't handle right now. 8520 } else { 8521 DC = CurContext; 8522 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8523 } 8524 8525 if (!DC->isRecord()) { 8526 // This implies that it has to be an operator or function. 8527 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8528 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8529 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8530 Diag(Loc, diag::err_introducing_special_friend) << 8531 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8532 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8533 return 0; 8534 } 8535 } 8536 8537 bool Redeclaration = false; 8538 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8539 move(TemplateParams), 8540 IsDefinition, 8541 Redeclaration); 8542 if (!ND) return 0; 8543 8544 assert(ND->getDeclContext() == DC); 8545 assert(ND->getLexicalDeclContext() == CurContext); 8546 8547 // Add the function declaration to the appropriate lookup tables, 8548 // adjusting the redeclarations list as necessary. We don't 8549 // want to do this yet if the friending class is dependent. 8550 // 8551 // Also update the scope-based lookup if the target context's 8552 // lookup context is in lexical scope. 8553 if (!CurContext->isDependentContext()) { 8554 DC = DC->getRedeclContext(); 8555 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8556 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8557 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8558 } 8559 8560 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8561 D.getIdentifierLoc(), ND, 8562 DS.getFriendSpecLoc()); 8563 FrD->setAccess(AS_public); 8564 CurContext->addDecl(FrD); 8565 8566 if (ND->isInvalidDecl()) 8567 FrD->setInvalidDecl(); 8568 else { 8569 FunctionDecl *FD; 8570 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8571 FD = FTD->getTemplatedDecl(); 8572 else 8573 FD = cast<FunctionDecl>(ND); 8574 8575 // Mark templated-scope function declarations as unsupported. 8576 if (FD->getNumTemplateParameterLists()) 8577 FrD->setUnsupportedFriend(true); 8578 } 8579 8580 return ND; 8581} 8582 8583void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8584 AdjustDeclIfTemplate(Dcl); 8585 8586 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8587 if (!Fn) { 8588 Diag(DelLoc, diag::err_deleted_non_function); 8589 return; 8590 } 8591 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8592 Diag(DelLoc, diag::err_deleted_decl_not_first); 8593 Diag(Prev->getLocation(), diag::note_previous_declaration); 8594 // If the declaration wasn't the first, we delete the function anyway for 8595 // recovery. 8596 } 8597 Fn->setDeletedAsWritten(); 8598} 8599 8600void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8601 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8602 8603 if (MD) { 8604 if (MD->getParent()->isDependentType()) { 8605 MD->setDefaulted(); 8606 MD->setExplicitlyDefaulted(); 8607 return; 8608 } 8609 8610 CXXSpecialMember Member = getSpecialMember(MD); 8611 if (Member == CXXInvalid) { 8612 Diag(DefaultLoc, diag::err_default_special_members); 8613 return; 8614 } 8615 8616 MD->setDefaulted(); 8617 MD->setExplicitlyDefaulted(); 8618 8619 // If this definition appears within the record, do the checking when 8620 // the record is complete. 8621 const FunctionDecl *Primary = MD; 8622 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8623 // Find the uninstantiated declaration that actually had the '= default' 8624 // on it. 8625 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8626 8627 if (Primary == Primary->getCanonicalDecl()) 8628 return; 8629 8630 switch (Member) { 8631 case CXXDefaultConstructor: { 8632 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8633 CheckExplicitlyDefaultedDefaultConstructor(CD); 8634 if (!CD->isInvalidDecl()) 8635 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8636 break; 8637 } 8638 8639 case CXXCopyConstructor: { 8640 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8641 CheckExplicitlyDefaultedCopyConstructor(CD); 8642 if (!CD->isInvalidDecl()) 8643 DefineImplicitCopyConstructor(DefaultLoc, CD); 8644 break; 8645 } 8646 8647 case CXXCopyAssignment: { 8648 CheckExplicitlyDefaultedCopyAssignment(MD); 8649 if (!MD->isInvalidDecl()) 8650 DefineImplicitCopyAssignment(DefaultLoc, MD); 8651 break; 8652 } 8653 8654 case CXXDestructor: { 8655 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8656 CheckExplicitlyDefaultedDestructor(DD); 8657 if (!DD->isInvalidDecl()) 8658 DefineImplicitDestructor(DefaultLoc, DD); 8659 break; 8660 } 8661 8662 case CXXMoveConstructor: 8663 case CXXMoveAssignment: 8664 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8665 break; 8666 8667 default: 8668 // FIXME: Do the rest once we have move functions 8669 break; 8670 } 8671 } else { 8672 Diag(DefaultLoc, diag::err_default_special_members); 8673 } 8674} 8675 8676static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8677 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8678 Stmt *SubStmt = *CI; 8679 if (!SubStmt) 8680 continue; 8681 if (isa<ReturnStmt>(SubStmt)) 8682 Self.Diag(SubStmt->getSourceRange().getBegin(), 8683 diag::err_return_in_constructor_handler); 8684 if (!isa<Expr>(SubStmt)) 8685 SearchForReturnInStmt(Self, SubStmt); 8686 } 8687} 8688 8689void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8690 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8691 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8692 SearchForReturnInStmt(*this, Handler); 8693 } 8694} 8695 8696bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8697 const CXXMethodDecl *Old) { 8698 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8699 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8700 8701 if (Context.hasSameType(NewTy, OldTy) || 8702 NewTy->isDependentType() || OldTy->isDependentType()) 8703 return false; 8704 8705 // Check if the return types are covariant 8706 QualType NewClassTy, OldClassTy; 8707 8708 /// Both types must be pointers or references to classes. 8709 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8710 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8711 NewClassTy = NewPT->getPointeeType(); 8712 OldClassTy = OldPT->getPointeeType(); 8713 } 8714 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8715 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8716 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8717 NewClassTy = NewRT->getPointeeType(); 8718 OldClassTy = OldRT->getPointeeType(); 8719 } 8720 } 8721 } 8722 8723 // The return types aren't either both pointers or references to a class type. 8724 if (NewClassTy.isNull()) { 8725 Diag(New->getLocation(), 8726 diag::err_different_return_type_for_overriding_virtual_function) 8727 << New->getDeclName() << NewTy << OldTy; 8728 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8729 8730 return true; 8731 } 8732 8733 // C++ [class.virtual]p6: 8734 // If the return type of D::f differs from the return type of B::f, the 8735 // class type in the return type of D::f shall be complete at the point of 8736 // declaration of D::f or shall be the class type D. 8737 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8738 if (!RT->isBeingDefined() && 8739 RequireCompleteType(New->getLocation(), NewClassTy, 8740 PDiag(diag::err_covariant_return_incomplete) 8741 << New->getDeclName())) 8742 return true; 8743 } 8744 8745 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8746 // Check if the new class derives from the old class. 8747 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8748 Diag(New->getLocation(), 8749 diag::err_covariant_return_not_derived) 8750 << New->getDeclName() << NewTy << OldTy; 8751 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8752 return true; 8753 } 8754 8755 // Check if we the conversion from derived to base is valid. 8756 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8757 diag::err_covariant_return_inaccessible_base, 8758 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8759 // FIXME: Should this point to the return type? 8760 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8761 // FIXME: this note won't trigger for delayed access control 8762 // diagnostics, and it's impossible to get an undelayed error 8763 // here from access control during the original parse because 8764 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8765 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8766 return true; 8767 } 8768 } 8769 8770 // The qualifiers of the return types must be the same. 8771 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8772 Diag(New->getLocation(), 8773 diag::err_covariant_return_type_different_qualifications) 8774 << New->getDeclName() << NewTy << OldTy; 8775 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8776 return true; 8777 }; 8778 8779 8780 // The new class type must have the same or less qualifiers as the old type. 8781 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8782 Diag(New->getLocation(), 8783 diag::err_covariant_return_type_class_type_more_qualified) 8784 << New->getDeclName() << NewTy << OldTy; 8785 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8786 return true; 8787 }; 8788 8789 return false; 8790} 8791 8792/// \brief Mark the given method pure. 8793/// 8794/// \param Method the method to be marked pure. 8795/// 8796/// \param InitRange the source range that covers the "0" initializer. 8797bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8798 SourceLocation EndLoc = InitRange.getEnd(); 8799 if (EndLoc.isValid()) 8800 Method->setRangeEnd(EndLoc); 8801 8802 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8803 Method->setPure(); 8804 return false; 8805 } 8806 8807 if (!Method->isInvalidDecl()) 8808 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8809 << Method->getDeclName() << InitRange; 8810 return true; 8811} 8812 8813/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8814/// an initializer for the out-of-line declaration 'Dcl'. The scope 8815/// is a fresh scope pushed for just this purpose. 8816/// 8817/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8818/// static data member of class X, names should be looked up in the scope of 8819/// class X. 8820void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8821 // If there is no declaration, there was an error parsing it. 8822 if (D == 0 || D->isInvalidDecl()) return; 8823 8824 // We should only get called for declarations with scope specifiers, like: 8825 // int foo::bar; 8826 assert(D->isOutOfLine()); 8827 EnterDeclaratorContext(S, D->getDeclContext()); 8828} 8829 8830/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8831/// initializer for the out-of-line declaration 'D'. 8832void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8833 // If there is no declaration, there was an error parsing it. 8834 if (D == 0 || D->isInvalidDecl()) return; 8835 8836 assert(D->isOutOfLine()); 8837 ExitDeclaratorContext(S); 8838} 8839 8840/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8841/// C++ if/switch/while/for statement. 8842/// e.g: "if (int x = f()) {...}" 8843DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8844 // C++ 6.4p2: 8845 // The declarator shall not specify a function or an array. 8846 // The type-specifier-seq shall not contain typedef and shall not declare a 8847 // new class or enumeration. 8848 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8849 "Parser allowed 'typedef' as storage class of condition decl."); 8850 8851 TagDecl *OwnedTag = 0; 8852 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8853 QualType Ty = TInfo->getType(); 8854 8855 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8856 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8857 // would be created and CXXConditionDeclExpr wants a VarDecl. 8858 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8859 << D.getSourceRange(); 8860 return DeclResult(); 8861 } else if (OwnedTag && OwnedTag->isDefinition()) { 8862 // The type-specifier-seq shall not declare a new class or enumeration. 8863 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8864 } 8865 8866 Decl *Dcl = ActOnDeclarator(S, D); 8867 if (!Dcl) 8868 return DeclResult(); 8869 8870 return Dcl; 8871} 8872 8873void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8874 bool DefinitionRequired) { 8875 // Ignore any vtable uses in unevaluated operands or for classes that do 8876 // not have a vtable. 8877 if (!Class->isDynamicClass() || Class->isDependentContext() || 8878 CurContext->isDependentContext() || 8879 ExprEvalContexts.back().Context == Unevaluated) 8880 return; 8881 8882 // Try to insert this class into the map. 8883 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8884 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8885 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8886 if (!Pos.second) { 8887 // If we already had an entry, check to see if we are promoting this vtable 8888 // to required a definition. If so, we need to reappend to the VTableUses 8889 // list, since we may have already processed the first entry. 8890 if (DefinitionRequired && !Pos.first->second) { 8891 Pos.first->second = true; 8892 } else { 8893 // Otherwise, we can early exit. 8894 return; 8895 } 8896 } 8897 8898 // Local classes need to have their virtual members marked 8899 // immediately. For all other classes, we mark their virtual members 8900 // at the end of the translation unit. 8901 if (Class->isLocalClass()) 8902 MarkVirtualMembersReferenced(Loc, Class); 8903 else 8904 VTableUses.push_back(std::make_pair(Class, Loc)); 8905} 8906 8907bool Sema::DefineUsedVTables() { 8908 if (VTableUses.empty()) 8909 return false; 8910 8911 // Note: The VTableUses vector could grow as a result of marking 8912 // the members of a class as "used", so we check the size each 8913 // time through the loop and prefer indices (with are stable) to 8914 // iterators (which are not). 8915 bool DefinedAnything = false; 8916 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8917 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8918 if (!Class) 8919 continue; 8920 8921 SourceLocation Loc = VTableUses[I].second; 8922 8923 // If this class has a key function, but that key function is 8924 // defined in another translation unit, we don't need to emit the 8925 // vtable even though we're using it. 8926 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8927 if (KeyFunction && !KeyFunction->hasBody()) { 8928 switch (KeyFunction->getTemplateSpecializationKind()) { 8929 case TSK_Undeclared: 8930 case TSK_ExplicitSpecialization: 8931 case TSK_ExplicitInstantiationDeclaration: 8932 // The key function is in another translation unit. 8933 continue; 8934 8935 case TSK_ExplicitInstantiationDefinition: 8936 case TSK_ImplicitInstantiation: 8937 // We will be instantiating the key function. 8938 break; 8939 } 8940 } else if (!KeyFunction) { 8941 // If we have a class with no key function that is the subject 8942 // of an explicit instantiation declaration, suppress the 8943 // vtable; it will live with the explicit instantiation 8944 // definition. 8945 bool IsExplicitInstantiationDeclaration 8946 = Class->getTemplateSpecializationKind() 8947 == TSK_ExplicitInstantiationDeclaration; 8948 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8949 REnd = Class->redecls_end(); 8950 R != REnd; ++R) { 8951 TemplateSpecializationKind TSK 8952 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8953 if (TSK == TSK_ExplicitInstantiationDeclaration) 8954 IsExplicitInstantiationDeclaration = true; 8955 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8956 IsExplicitInstantiationDeclaration = false; 8957 break; 8958 } 8959 } 8960 8961 if (IsExplicitInstantiationDeclaration) 8962 continue; 8963 } 8964 8965 // Mark all of the virtual members of this class as referenced, so 8966 // that we can build a vtable. Then, tell the AST consumer that a 8967 // vtable for this class is required. 8968 DefinedAnything = true; 8969 MarkVirtualMembersReferenced(Loc, Class); 8970 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8971 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8972 8973 // Optionally warn if we're emitting a weak vtable. 8974 if (Class->getLinkage() == ExternalLinkage && 8975 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 8976 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 8977 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 8978 } 8979 } 8980 VTableUses.clear(); 8981 8982 return DefinedAnything; 8983} 8984 8985void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 8986 const CXXRecordDecl *RD) { 8987 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 8988 e = RD->method_end(); i != e; ++i) { 8989 CXXMethodDecl *MD = *i; 8990 8991 // C++ [basic.def.odr]p2: 8992 // [...] A virtual member function is used if it is not pure. [...] 8993 if (MD->isVirtual() && !MD->isPure()) 8994 MarkDeclarationReferenced(Loc, MD); 8995 } 8996 8997 // Only classes that have virtual bases need a VTT. 8998 if (RD->getNumVBases() == 0) 8999 return; 9000 9001 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9002 e = RD->bases_end(); i != e; ++i) { 9003 const CXXRecordDecl *Base = 9004 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9005 if (Base->getNumVBases() == 0) 9006 continue; 9007 MarkVirtualMembersReferenced(Loc, Base); 9008 } 9009} 9010 9011/// SetIvarInitializers - This routine builds initialization ASTs for the 9012/// Objective-C implementation whose ivars need be initialized. 9013void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9014 if (!getLangOptions().CPlusPlus) 9015 return; 9016 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9017 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9018 CollectIvarsToConstructOrDestruct(OID, ivars); 9019 if (ivars.empty()) 9020 return; 9021 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9022 for (unsigned i = 0; i < ivars.size(); i++) { 9023 FieldDecl *Field = ivars[i]; 9024 if (Field->isInvalidDecl()) 9025 continue; 9026 9027 CXXCtorInitializer *Member; 9028 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9029 InitializationKind InitKind = 9030 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9031 9032 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9033 ExprResult MemberInit = 9034 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9035 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9036 // Note, MemberInit could actually come back empty if no initialization 9037 // is required (e.g., because it would call a trivial default constructor) 9038 if (!MemberInit.get() || MemberInit.isInvalid()) 9039 continue; 9040 9041 Member = 9042 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9043 SourceLocation(), 9044 MemberInit.takeAs<Expr>(), 9045 SourceLocation()); 9046 AllToInit.push_back(Member); 9047 9048 // Be sure that the destructor is accessible and is marked as referenced. 9049 if (const RecordType *RecordTy 9050 = Context.getBaseElementType(Field->getType()) 9051 ->getAs<RecordType>()) { 9052 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9053 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9054 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9055 CheckDestructorAccess(Field->getLocation(), Destructor, 9056 PDiag(diag::err_access_dtor_ivar) 9057 << Context.getBaseElementType(Field->getType())); 9058 } 9059 } 9060 } 9061 ObjCImplementation->setIvarInitializers(Context, 9062 AllToInit.data(), AllToInit.size()); 9063 } 9064} 9065 9066static 9067void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9068 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9069 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9070 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9071 Sema &S) { 9072 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9073 CE = Current.end(); 9074 if (Ctor->isInvalidDecl()) 9075 return; 9076 9077 const FunctionDecl *FNTarget = 0; 9078 CXXConstructorDecl *Target; 9079 9080 // We ignore the result here since if we don't have a body, Target will be 9081 // null below. 9082 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9083 Target 9084= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9085 9086 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9087 // Avoid dereferencing a null pointer here. 9088 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9089 9090 if (!Current.insert(Canonical)) 9091 return; 9092 9093 // We know that beyond here, we aren't chaining into a cycle. 9094 if (!Target || !Target->isDelegatingConstructor() || 9095 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9096 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9097 Valid.insert(*CI); 9098 Current.clear(); 9099 // We've hit a cycle. 9100 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9101 Current.count(TCanonical)) { 9102 // If we haven't diagnosed this cycle yet, do so now. 9103 if (!Invalid.count(TCanonical)) { 9104 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9105 diag::warn_delegating_ctor_cycle) 9106 << Ctor; 9107 9108 // Don't add a note for a function delegating directo to itself. 9109 if (TCanonical != Canonical) 9110 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9111 9112 CXXConstructorDecl *C = Target; 9113 while (C->getCanonicalDecl() != Canonical) { 9114 (void)C->getTargetConstructor()->hasBody(FNTarget); 9115 assert(FNTarget && "Ctor cycle through bodiless function"); 9116 9117 C 9118 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9119 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9120 } 9121 } 9122 9123 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9124 Invalid.insert(*CI); 9125 Current.clear(); 9126 } else { 9127 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9128 } 9129} 9130 9131 9132void Sema::CheckDelegatingCtorCycles() { 9133 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9134 9135 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9136 CE = Current.end(); 9137 9138 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9139 I = DelegatingCtorDecls.begin(), 9140 E = DelegatingCtorDecls.end(); 9141 I != E; ++I) { 9142 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9143 } 9144 9145 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9146 (*CI)->setInvalidDecl(); 9147} 9148