SemaDeclCXX.cpp revision e4246a633b13197634225971b25df0cbdcec0c5d
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 // If we have an MSAny spec already, don't bother. 116 if (!Method || ComputedEST == EST_MSAny) 117 return; 118 119 const FunctionProtoType *Proto 120 = Method->getType()->getAs<FunctionProtoType>(); 121 122 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 123 124 // If this function can throw any exceptions, make a note of that. 125 if (EST == EST_MSAny || EST == EST_None) { 126 ClearExceptions(); 127 ComputedEST = EST; 128 return; 129 } 130 131 // If this function has a basic noexcept, it doesn't affect the outcome. 132 if (EST == EST_BasicNoexcept) 133 return; 134 135 // If we have a throw-all spec at this point, ignore the function. 136 if (ComputedEST == EST_None) 137 return; 138 139 // If we're still at noexcept(true) and there's a nothrow() callee, 140 // change to that specification. 141 if (EST == EST_DynamicNone) { 142 if (ComputedEST == EST_BasicNoexcept) 143 ComputedEST = EST_DynamicNone; 144 return; 145 } 146 147 // Check out noexcept specs. 148 if (EST == EST_ComputedNoexcept) { 149 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 150 assert(NR != FunctionProtoType::NR_NoNoexcept && 151 "Must have noexcept result for EST_ComputedNoexcept."); 152 assert(NR != FunctionProtoType::NR_Dependent && 153 "Should not generate implicit declarations for dependent cases, " 154 "and don't know how to handle them anyway."); 155 156 // noexcept(false) -> no spec on the new function 157 if (NR == FunctionProtoType::NR_Throw) { 158 ClearExceptions(); 159 ComputedEST = EST_None; 160 } 161 // noexcept(true) won't change anything either. 162 return; 163 } 164 165 assert(EST == EST_Dynamic && "EST case not considered earlier."); 166 assert(ComputedEST != EST_None && 167 "Shouldn't collect exceptions when throw-all is guaranteed."); 168 ComputedEST = EST_Dynamic; 169 // Record the exceptions in this function's exception specification. 170 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 171 EEnd = Proto->exception_end(); 172 E != EEnd; ++E) 173 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 174 Exceptions.push_back(*E); 175} 176 177bool 178Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 179 SourceLocation EqualLoc) { 180 if (RequireCompleteType(Param->getLocation(), Param->getType(), 181 diag::err_typecheck_decl_incomplete_type)) { 182 Param->setInvalidDecl(); 183 return true; 184 } 185 186 // C++ [dcl.fct.default]p5 187 // A default argument expression is implicitly converted (clause 188 // 4) to the parameter type. The default argument expression has 189 // the same semantic constraints as the initializer expression in 190 // a declaration of a variable of the parameter type, using the 191 // copy-initialization semantics (8.5). 192 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 193 Param); 194 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 195 EqualLoc); 196 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 197 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 198 MultiExprArg(*this, &Arg, 1)); 199 if (Result.isInvalid()) 200 return true; 201 Arg = Result.takeAs<Expr>(); 202 203 CheckImplicitConversions(Arg, EqualLoc); 204 Arg = MaybeCreateExprWithCleanups(Arg); 205 206 // Okay: add the default argument to the parameter 207 Param->setDefaultArg(Arg); 208 209 // We have already instantiated this parameter; provide each of the 210 // instantiations with the uninstantiated default argument. 211 UnparsedDefaultArgInstantiationsMap::iterator InstPos 212 = UnparsedDefaultArgInstantiations.find(Param); 213 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 214 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 215 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 216 217 // We're done tracking this parameter's instantiations. 218 UnparsedDefaultArgInstantiations.erase(InstPos); 219 } 220 221 return false; 222} 223 224/// ActOnParamDefaultArgument - Check whether the default argument 225/// provided for a function parameter is well-formed. If so, attach it 226/// to the parameter declaration. 227void 228Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 229 Expr *DefaultArg) { 230 if (!param || !DefaultArg) 231 return; 232 233 ParmVarDecl *Param = cast<ParmVarDecl>(param); 234 UnparsedDefaultArgLocs.erase(Param); 235 236 // Default arguments are only permitted in C++ 237 if (!getLangOptions().CPlusPlus) { 238 Diag(EqualLoc, diag::err_param_default_argument) 239 << DefaultArg->getSourceRange(); 240 Param->setInvalidDecl(); 241 return; 242 } 243 244 // Check for unexpanded parameter packs. 245 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 246 Param->setInvalidDecl(); 247 return; 248 } 249 250 // Check that the default argument is well-formed 251 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 252 if (DefaultArgChecker.Visit(DefaultArg)) { 253 Param->setInvalidDecl(); 254 return; 255 } 256 257 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 258} 259 260/// ActOnParamUnparsedDefaultArgument - We've seen a default 261/// argument for a function parameter, but we can't parse it yet 262/// because we're inside a class definition. Note that this default 263/// argument will be parsed later. 264void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 265 SourceLocation EqualLoc, 266 SourceLocation ArgLoc) { 267 if (!param) 268 return; 269 270 ParmVarDecl *Param = cast<ParmVarDecl>(param); 271 if (Param) 272 Param->setUnparsedDefaultArg(); 273 274 UnparsedDefaultArgLocs[Param] = ArgLoc; 275} 276 277/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 278/// the default argument for the parameter param failed. 279void Sema::ActOnParamDefaultArgumentError(Decl *param) { 280 if (!param) 281 return; 282 283 ParmVarDecl *Param = cast<ParmVarDecl>(param); 284 285 Param->setInvalidDecl(); 286 287 UnparsedDefaultArgLocs.erase(Param); 288} 289 290/// CheckExtraCXXDefaultArguments - Check for any extra default 291/// arguments in the declarator, which is not a function declaration 292/// or definition and therefore is not permitted to have default 293/// arguments. This routine should be invoked for every declarator 294/// that is not a function declaration or definition. 295void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 296 // C++ [dcl.fct.default]p3 297 // A default argument expression shall be specified only in the 298 // parameter-declaration-clause of a function declaration or in a 299 // template-parameter (14.1). It shall not be specified for a 300 // parameter pack. If it is specified in a 301 // parameter-declaration-clause, it shall not occur within a 302 // declarator or abstract-declarator of a parameter-declaration. 303 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 304 DeclaratorChunk &chunk = D.getTypeObject(i); 305 if (chunk.Kind == DeclaratorChunk::Function) { 306 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 307 ParmVarDecl *Param = 308 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 309 if (Param->hasUnparsedDefaultArg()) { 310 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 311 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 312 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 313 delete Toks; 314 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 315 } else if (Param->getDefaultArg()) { 316 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 317 << Param->getDefaultArg()->getSourceRange(); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322 } 323} 324 325// MergeCXXFunctionDecl - Merge two declarations of the same C++ 326// function, once we already know that they have the same 327// type. Subroutine of MergeFunctionDecl. Returns true if there was an 328// error, false otherwise. 329bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 330 bool Invalid = false; 331 332 // C++ [dcl.fct.default]p4: 333 // For non-template functions, default arguments can be added in 334 // later declarations of a function in the same 335 // scope. Declarations in different scopes have completely 336 // distinct sets of default arguments. That is, declarations in 337 // inner scopes do not acquire default arguments from 338 // declarations in outer scopes, and vice versa. In a given 339 // function declaration, all parameters subsequent to a 340 // parameter with a default argument shall have default 341 // arguments supplied in this or previous declarations. A 342 // default argument shall not be redefined by a later 343 // declaration (not even to the same value). 344 // 345 // C++ [dcl.fct.default]p6: 346 // Except for member functions of class templates, the default arguments 347 // in a member function definition that appears outside of the class 348 // definition are added to the set of default arguments provided by the 349 // member function declaration in the class definition. 350 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 351 ParmVarDecl *OldParam = Old->getParamDecl(p); 352 ParmVarDecl *NewParam = New->getParamDecl(p); 353 354 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 355 356 unsigned DiagDefaultParamID = 357 diag::err_param_default_argument_redefinition; 358 359 // MSVC accepts that default parameters be redefined for member functions 360 // of template class. The new default parameter's value is ignored. 361 Invalid = true; 362 if (getLangOptions().Microsoft) { 363 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 364 if (MD && MD->getParent()->getDescribedClassTemplate()) { 365 // Merge the old default argument into the new parameter. 366 NewParam->setHasInheritedDefaultArg(); 367 if (OldParam->hasUninstantiatedDefaultArg()) 368 NewParam->setUninstantiatedDefaultArg( 369 OldParam->getUninstantiatedDefaultArg()); 370 else 371 NewParam->setDefaultArg(OldParam->getInit()); 372 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 373 Invalid = false; 374 } 375 } 376 377 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 378 // hint here. Alternatively, we could walk the type-source information 379 // for NewParam to find the last source location in the type... but it 380 // isn't worth the effort right now. This is the kind of test case that 381 // is hard to get right: 382 // int f(int); 383 // void g(int (*fp)(int) = f); 384 // void g(int (*fp)(int) = &f); 385 Diag(NewParam->getLocation(), DiagDefaultParamID) 386 << NewParam->getDefaultArgRange(); 387 388 // Look for the function declaration where the default argument was 389 // actually written, which may be a declaration prior to Old. 390 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 391 Older; Older = Older->getPreviousDeclaration()) { 392 if (!Older->getParamDecl(p)->hasDefaultArg()) 393 break; 394 395 OldParam = Older->getParamDecl(p); 396 } 397 398 Diag(OldParam->getLocation(), diag::note_previous_definition) 399 << OldParam->getDefaultArgRange(); 400 } else if (OldParam->hasDefaultArg()) { 401 // Merge the old default argument into the new parameter. 402 // It's important to use getInit() here; getDefaultArg() 403 // strips off any top-level ExprWithCleanups. 404 NewParam->setHasInheritedDefaultArg(); 405 if (OldParam->hasUninstantiatedDefaultArg()) 406 NewParam->setUninstantiatedDefaultArg( 407 OldParam->getUninstantiatedDefaultArg()); 408 else 409 NewParam->setDefaultArg(OldParam->getInit()); 410 } else if (NewParam->hasDefaultArg()) { 411 if (New->getDescribedFunctionTemplate()) { 412 // Paragraph 4, quoted above, only applies to non-template functions. 413 Diag(NewParam->getLocation(), 414 diag::err_param_default_argument_template_redecl) 415 << NewParam->getDefaultArgRange(); 416 Diag(Old->getLocation(), diag::note_template_prev_declaration) 417 << false; 418 } else if (New->getTemplateSpecializationKind() 419 != TSK_ImplicitInstantiation && 420 New->getTemplateSpecializationKind() != TSK_Undeclared) { 421 // C++ [temp.expr.spec]p21: 422 // Default function arguments shall not be specified in a declaration 423 // or a definition for one of the following explicit specializations: 424 // - the explicit specialization of a function template; 425 // - the explicit specialization of a member function template; 426 // - the explicit specialization of a member function of a class 427 // template where the class template specialization to which the 428 // member function specialization belongs is implicitly 429 // instantiated. 430 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 431 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 432 << New->getDeclName() 433 << NewParam->getDefaultArgRange(); 434 } else if (New->getDeclContext()->isDependentContext()) { 435 // C++ [dcl.fct.default]p6 (DR217): 436 // Default arguments for a member function of a class template shall 437 // be specified on the initial declaration of the member function 438 // within the class template. 439 // 440 // Reading the tea leaves a bit in DR217 and its reference to DR205 441 // leads me to the conclusion that one cannot add default function 442 // arguments for an out-of-line definition of a member function of a 443 // dependent type. 444 int WhichKind = 2; 445 if (CXXRecordDecl *Record 446 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 447 if (Record->getDescribedClassTemplate()) 448 WhichKind = 0; 449 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 450 WhichKind = 1; 451 else 452 WhichKind = 2; 453 } 454 455 Diag(NewParam->getLocation(), 456 diag::err_param_default_argument_member_template_redecl) 457 << WhichKind 458 << NewParam->getDefaultArgRange(); 459 } 460 } 461 } 462 463 if (CheckEquivalentExceptionSpec(Old, New)) 464 Invalid = true; 465 466 return Invalid; 467} 468 469/// \brief Merge the exception specifications of two variable declarations. 470/// 471/// This is called when there's a redeclaration of a VarDecl. The function 472/// checks if the redeclaration might have an exception specification and 473/// validates compatibility and merges the specs if necessary. 474void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 475 // Shortcut if exceptions are disabled. 476 if (!getLangOptions().CXXExceptions) 477 return; 478 479 assert(Context.hasSameType(New->getType(), Old->getType()) && 480 "Should only be called if types are otherwise the same."); 481 482 QualType NewType = New->getType(); 483 QualType OldType = Old->getType(); 484 485 // We're only interested in pointers and references to functions, as well 486 // as pointers to member functions. 487 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 488 NewType = R->getPointeeType(); 489 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 490 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 491 NewType = P->getPointeeType(); 492 OldType = OldType->getAs<PointerType>()->getPointeeType(); 493 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 494 NewType = M->getPointeeType(); 495 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 496 } 497 498 if (!NewType->isFunctionProtoType()) 499 return; 500 501 // There's lots of special cases for functions. For function pointers, system 502 // libraries are hopefully not as broken so that we don't need these 503 // workarounds. 504 if (CheckEquivalentExceptionSpec( 505 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 506 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 507 New->setInvalidDecl(); 508 } 509} 510 511/// CheckCXXDefaultArguments - Verify that the default arguments for a 512/// function declaration are well-formed according to C++ 513/// [dcl.fct.default]. 514void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 515 unsigned NumParams = FD->getNumParams(); 516 unsigned p; 517 518 // Find first parameter with a default argument 519 for (p = 0; p < NumParams; ++p) { 520 ParmVarDecl *Param = FD->getParamDecl(p); 521 if (Param->hasDefaultArg()) 522 break; 523 } 524 525 // C++ [dcl.fct.default]p4: 526 // In a given function declaration, all parameters 527 // subsequent to a parameter with a default argument shall 528 // have default arguments supplied in this or previous 529 // declarations. A default argument shall not be redefined 530 // by a later declaration (not even to the same value). 531 unsigned LastMissingDefaultArg = 0; 532 for (; p < NumParams; ++p) { 533 ParmVarDecl *Param = FD->getParamDecl(p); 534 if (!Param->hasDefaultArg()) { 535 if (Param->isInvalidDecl()) 536 /* We already complained about this parameter. */; 537 else if (Param->getIdentifier()) 538 Diag(Param->getLocation(), 539 diag::err_param_default_argument_missing_name) 540 << Param->getIdentifier(); 541 else 542 Diag(Param->getLocation(), 543 diag::err_param_default_argument_missing); 544 545 LastMissingDefaultArg = p; 546 } 547 } 548 549 if (LastMissingDefaultArg > 0) { 550 // Some default arguments were missing. Clear out all of the 551 // default arguments up to (and including) the last missing 552 // default argument, so that we leave the function parameters 553 // in a semantically valid state. 554 for (p = 0; p <= LastMissingDefaultArg; ++p) { 555 ParmVarDecl *Param = FD->getParamDecl(p); 556 if (Param->hasDefaultArg()) { 557 Param->setDefaultArg(0); 558 } 559 } 560 } 561} 562 563/// isCurrentClassName - Determine whether the identifier II is the 564/// name of the class type currently being defined. In the case of 565/// nested classes, this will only return true if II is the name of 566/// the innermost class. 567bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 568 const CXXScopeSpec *SS) { 569 assert(getLangOptions().CPlusPlus && "No class names in C!"); 570 571 CXXRecordDecl *CurDecl; 572 if (SS && SS->isSet() && !SS->isInvalid()) { 573 DeclContext *DC = computeDeclContext(*SS, true); 574 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 575 } else 576 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 577 578 if (CurDecl && CurDecl->getIdentifier()) 579 return &II == CurDecl->getIdentifier(); 580 else 581 return false; 582} 583 584/// \brief Check the validity of a C++ base class specifier. 585/// 586/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 587/// and returns NULL otherwise. 588CXXBaseSpecifier * 589Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 590 SourceRange SpecifierRange, 591 bool Virtual, AccessSpecifier Access, 592 TypeSourceInfo *TInfo, 593 SourceLocation EllipsisLoc) { 594 QualType BaseType = TInfo->getType(); 595 596 // C++ [class.union]p1: 597 // A union shall not have base classes. 598 if (Class->isUnion()) { 599 Diag(Class->getLocation(), diag::err_base_clause_on_union) 600 << SpecifierRange; 601 return 0; 602 } 603 604 if (EllipsisLoc.isValid() && 605 !TInfo->getType()->containsUnexpandedParameterPack()) { 606 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 607 << TInfo->getTypeLoc().getSourceRange(); 608 EllipsisLoc = SourceLocation(); 609 } 610 611 if (BaseType->isDependentType()) 612 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 613 Class->getTagKind() == TTK_Class, 614 Access, TInfo, EllipsisLoc); 615 616 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 617 618 // Base specifiers must be record types. 619 if (!BaseType->isRecordType()) { 620 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 621 return 0; 622 } 623 624 // C++ [class.union]p1: 625 // A union shall not be used as a base class. 626 if (BaseType->isUnionType()) { 627 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 628 return 0; 629 } 630 631 // C++ [class.derived]p2: 632 // The class-name in a base-specifier shall not be an incompletely 633 // defined class. 634 if (RequireCompleteType(BaseLoc, BaseType, 635 PDiag(diag::err_incomplete_base_class) 636 << SpecifierRange)) { 637 Class->setInvalidDecl(); 638 return 0; 639 } 640 641 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 642 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 643 assert(BaseDecl && "Record type has no declaration"); 644 BaseDecl = BaseDecl->getDefinition(); 645 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 646 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 647 assert(CXXBaseDecl && "Base type is not a C++ type"); 648 649 // C++ [class]p3: 650 // If a class is marked final and it appears as a base-type-specifier in 651 // base-clause, the program is ill-formed. 652 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 653 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 654 << CXXBaseDecl->getDeclName(); 655 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 656 << CXXBaseDecl->getDeclName(); 657 return 0; 658 } 659 660 if (BaseDecl->isInvalidDecl()) 661 Class->setInvalidDecl(); 662 663 // Create the base specifier. 664 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 665 Class->getTagKind() == TTK_Class, 666 Access, TInfo, EllipsisLoc); 667} 668 669/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 670/// one entry in the base class list of a class specifier, for 671/// example: 672/// class foo : public bar, virtual private baz { 673/// 'public bar' and 'virtual private baz' are each base-specifiers. 674BaseResult 675Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 676 bool Virtual, AccessSpecifier Access, 677 ParsedType basetype, SourceLocation BaseLoc, 678 SourceLocation EllipsisLoc) { 679 if (!classdecl) 680 return true; 681 682 AdjustDeclIfTemplate(classdecl); 683 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 684 if (!Class) 685 return true; 686 687 TypeSourceInfo *TInfo = 0; 688 GetTypeFromParser(basetype, &TInfo); 689 690 if (EllipsisLoc.isInvalid() && 691 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 692 UPPC_BaseType)) 693 return true; 694 695 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 696 Virtual, Access, TInfo, 697 EllipsisLoc)) 698 return BaseSpec; 699 700 return true; 701} 702 703/// \brief Performs the actual work of attaching the given base class 704/// specifiers to a C++ class. 705bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 706 unsigned NumBases) { 707 if (NumBases == 0) 708 return false; 709 710 // Used to keep track of which base types we have already seen, so 711 // that we can properly diagnose redundant direct base types. Note 712 // that the key is always the unqualified canonical type of the base 713 // class. 714 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 715 716 // Copy non-redundant base specifiers into permanent storage. 717 unsigned NumGoodBases = 0; 718 bool Invalid = false; 719 for (unsigned idx = 0; idx < NumBases; ++idx) { 720 QualType NewBaseType 721 = Context.getCanonicalType(Bases[idx]->getType()); 722 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 723 if (!Class->hasObjectMember()) { 724 if (const RecordType *FDTTy = 725 NewBaseType.getTypePtr()->getAs<RecordType>()) 726 if (FDTTy->getDecl()->hasObjectMember()) 727 Class->setHasObjectMember(true); 728 } 729 730 if (KnownBaseTypes[NewBaseType]) { 731 // C++ [class.mi]p3: 732 // A class shall not be specified as a direct base class of a 733 // derived class more than once. 734 Diag(Bases[idx]->getSourceRange().getBegin(), 735 diag::err_duplicate_base_class) 736 << KnownBaseTypes[NewBaseType]->getType() 737 << Bases[idx]->getSourceRange(); 738 739 // Delete the duplicate base class specifier; we're going to 740 // overwrite its pointer later. 741 Context.Deallocate(Bases[idx]); 742 743 Invalid = true; 744 } else { 745 // Okay, add this new base class. 746 KnownBaseTypes[NewBaseType] = Bases[idx]; 747 Bases[NumGoodBases++] = Bases[idx]; 748 } 749 } 750 751 // Attach the remaining base class specifiers to the derived class. 752 Class->setBases(Bases, NumGoodBases); 753 754 // Delete the remaining (good) base class specifiers, since their 755 // data has been copied into the CXXRecordDecl. 756 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 757 Context.Deallocate(Bases[idx]); 758 759 return Invalid; 760} 761 762/// ActOnBaseSpecifiers - Attach the given base specifiers to the 763/// class, after checking whether there are any duplicate base 764/// classes. 765void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 766 unsigned NumBases) { 767 if (!ClassDecl || !Bases || !NumBases) 768 return; 769 770 AdjustDeclIfTemplate(ClassDecl); 771 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 772 (CXXBaseSpecifier**)(Bases), NumBases); 773} 774 775static CXXRecordDecl *GetClassForType(QualType T) { 776 if (const RecordType *RT = T->getAs<RecordType>()) 777 return cast<CXXRecordDecl>(RT->getDecl()); 778 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 779 return ICT->getDecl(); 780 else 781 return 0; 782} 783 784/// \brief Determine whether the type \p Derived is a C++ class that is 785/// derived from the type \p Base. 786bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 787 if (!getLangOptions().CPlusPlus) 788 return false; 789 790 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 791 if (!DerivedRD) 792 return false; 793 794 CXXRecordDecl *BaseRD = GetClassForType(Base); 795 if (!BaseRD) 796 return false; 797 798 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 799 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 800} 801 802/// \brief Determine whether the type \p Derived is a C++ class that is 803/// derived from the type \p Base. 804bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 805 if (!getLangOptions().CPlusPlus) 806 return false; 807 808 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 809 if (!DerivedRD) 810 return false; 811 812 CXXRecordDecl *BaseRD = GetClassForType(Base); 813 if (!BaseRD) 814 return false; 815 816 return DerivedRD->isDerivedFrom(BaseRD, Paths); 817} 818 819void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 820 CXXCastPath &BasePathArray) { 821 assert(BasePathArray.empty() && "Base path array must be empty!"); 822 assert(Paths.isRecordingPaths() && "Must record paths!"); 823 824 const CXXBasePath &Path = Paths.front(); 825 826 // We first go backward and check if we have a virtual base. 827 // FIXME: It would be better if CXXBasePath had the base specifier for 828 // the nearest virtual base. 829 unsigned Start = 0; 830 for (unsigned I = Path.size(); I != 0; --I) { 831 if (Path[I - 1].Base->isVirtual()) { 832 Start = I - 1; 833 break; 834 } 835 } 836 837 // Now add all bases. 838 for (unsigned I = Start, E = Path.size(); I != E; ++I) 839 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 840} 841 842/// \brief Determine whether the given base path includes a virtual 843/// base class. 844bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 845 for (CXXCastPath::const_iterator B = BasePath.begin(), 846 BEnd = BasePath.end(); 847 B != BEnd; ++B) 848 if ((*B)->isVirtual()) 849 return true; 850 851 return false; 852} 853 854/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 855/// conversion (where Derived and Base are class types) is 856/// well-formed, meaning that the conversion is unambiguous (and 857/// that all of the base classes are accessible). Returns true 858/// and emits a diagnostic if the code is ill-formed, returns false 859/// otherwise. Loc is the location where this routine should point to 860/// if there is an error, and Range is the source range to highlight 861/// if there is an error. 862bool 863Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 864 unsigned InaccessibleBaseID, 865 unsigned AmbigiousBaseConvID, 866 SourceLocation Loc, SourceRange Range, 867 DeclarationName Name, 868 CXXCastPath *BasePath) { 869 // First, determine whether the path from Derived to Base is 870 // ambiguous. This is slightly more expensive than checking whether 871 // the Derived to Base conversion exists, because here we need to 872 // explore multiple paths to determine if there is an ambiguity. 873 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 874 /*DetectVirtual=*/false); 875 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 876 assert(DerivationOkay && 877 "Can only be used with a derived-to-base conversion"); 878 (void)DerivationOkay; 879 880 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 881 if (InaccessibleBaseID) { 882 // Check that the base class can be accessed. 883 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 884 InaccessibleBaseID)) { 885 case AR_inaccessible: 886 return true; 887 case AR_accessible: 888 case AR_dependent: 889 case AR_delayed: 890 break; 891 } 892 } 893 894 // Build a base path if necessary. 895 if (BasePath) 896 BuildBasePathArray(Paths, *BasePath); 897 return false; 898 } 899 900 // We know that the derived-to-base conversion is ambiguous, and 901 // we're going to produce a diagnostic. Perform the derived-to-base 902 // search just one more time to compute all of the possible paths so 903 // that we can print them out. This is more expensive than any of 904 // the previous derived-to-base checks we've done, but at this point 905 // performance isn't as much of an issue. 906 Paths.clear(); 907 Paths.setRecordingPaths(true); 908 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 909 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 910 (void)StillOkay; 911 912 // Build up a textual representation of the ambiguous paths, e.g., 913 // D -> B -> A, that will be used to illustrate the ambiguous 914 // conversions in the diagnostic. We only print one of the paths 915 // to each base class subobject. 916 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 917 918 Diag(Loc, AmbigiousBaseConvID) 919 << Derived << Base << PathDisplayStr << Range << Name; 920 return true; 921} 922 923bool 924Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 925 SourceLocation Loc, SourceRange Range, 926 CXXCastPath *BasePath, 927 bool IgnoreAccess) { 928 return CheckDerivedToBaseConversion(Derived, Base, 929 IgnoreAccess ? 0 930 : diag::err_upcast_to_inaccessible_base, 931 diag::err_ambiguous_derived_to_base_conv, 932 Loc, Range, DeclarationName(), 933 BasePath); 934} 935 936 937/// @brief Builds a string representing ambiguous paths from a 938/// specific derived class to different subobjects of the same base 939/// class. 940/// 941/// This function builds a string that can be used in error messages 942/// to show the different paths that one can take through the 943/// inheritance hierarchy to go from the derived class to different 944/// subobjects of a base class. The result looks something like this: 945/// @code 946/// struct D -> struct B -> struct A 947/// struct D -> struct C -> struct A 948/// @endcode 949std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 950 std::string PathDisplayStr; 951 std::set<unsigned> DisplayedPaths; 952 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 953 Path != Paths.end(); ++Path) { 954 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 955 // We haven't displayed a path to this particular base 956 // class subobject yet. 957 PathDisplayStr += "\n "; 958 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 959 for (CXXBasePath::const_iterator Element = Path->begin(); 960 Element != Path->end(); ++Element) 961 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 962 } 963 } 964 965 return PathDisplayStr; 966} 967 968//===----------------------------------------------------------------------===// 969// C++ class member Handling 970//===----------------------------------------------------------------------===// 971 972/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 973Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 974 SourceLocation ASLoc, 975 SourceLocation ColonLoc) { 976 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 977 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 978 ASLoc, ColonLoc); 979 CurContext->addHiddenDecl(ASDecl); 980 return ASDecl; 981} 982 983/// CheckOverrideControl - Check C++0x override control semantics. 984void Sema::CheckOverrideControl(const Decl *D) { 985 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 986 if (!MD || !MD->isVirtual()) 987 return; 988 989 if (MD->isDependentContext()) 990 return; 991 992 // C++0x [class.virtual]p3: 993 // If a virtual function is marked with the virt-specifier override and does 994 // not override a member function of a base class, 995 // the program is ill-formed. 996 bool HasOverriddenMethods = 997 MD->begin_overridden_methods() != MD->end_overridden_methods(); 998 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 999 Diag(MD->getLocation(), 1000 diag::err_function_marked_override_not_overriding) 1001 << MD->getDeclName(); 1002 return; 1003 } 1004} 1005 1006/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1007/// function overrides a virtual member function marked 'final', according to 1008/// C++0x [class.virtual]p3. 1009bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1010 const CXXMethodDecl *Old) { 1011 if (!Old->hasAttr<FinalAttr>()) 1012 return false; 1013 1014 Diag(New->getLocation(), diag::err_final_function_overridden) 1015 << New->getDeclName(); 1016 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1017 return true; 1018} 1019 1020/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1021/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1022/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1023/// any. 1024Decl * 1025Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1026 MultiTemplateParamsArg TemplateParameterLists, 1027 ExprTy *BW, const VirtSpecifiers &VS, 1028 ExprTy *InitExpr, bool IsDefinition) { 1029 const DeclSpec &DS = D.getDeclSpec(); 1030 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1031 DeclarationName Name = NameInfo.getName(); 1032 SourceLocation Loc = NameInfo.getLoc(); 1033 1034 // For anonymous bitfields, the location should point to the type. 1035 if (Loc.isInvalid()) 1036 Loc = D.getSourceRange().getBegin(); 1037 1038 Expr *BitWidth = static_cast<Expr*>(BW); 1039 Expr *Init = static_cast<Expr*>(InitExpr); 1040 1041 assert(isa<CXXRecordDecl>(CurContext)); 1042 assert(!DS.isFriendSpecified()); 1043 1044 bool isFunc = false; 1045 if (D.isFunctionDeclarator()) 1046 isFunc = true; 1047 else if (D.getNumTypeObjects() == 0 && 1048 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1049 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1050 isFunc = TDType->isFunctionType(); 1051 } 1052 1053 // C++ 9.2p6: A member shall not be declared to have automatic storage 1054 // duration (auto, register) or with the extern storage-class-specifier. 1055 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1056 // data members and cannot be applied to names declared const or static, 1057 // and cannot be applied to reference members. 1058 switch (DS.getStorageClassSpec()) { 1059 case DeclSpec::SCS_unspecified: 1060 case DeclSpec::SCS_typedef: 1061 case DeclSpec::SCS_static: 1062 // FALL THROUGH. 1063 break; 1064 case DeclSpec::SCS_mutable: 1065 if (isFunc) { 1066 if (DS.getStorageClassSpecLoc().isValid()) 1067 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1068 else 1069 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1070 1071 // FIXME: It would be nicer if the keyword was ignored only for this 1072 // declarator. Otherwise we could get follow-up errors. 1073 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1074 } 1075 break; 1076 default: 1077 if (DS.getStorageClassSpecLoc().isValid()) 1078 Diag(DS.getStorageClassSpecLoc(), 1079 diag::err_storageclass_invalid_for_member); 1080 else 1081 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1082 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1083 } 1084 1085 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1086 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1087 !isFunc); 1088 1089 Decl *Member; 1090 if (isInstField) { 1091 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1092 1093 if (SS.isSet() && !SS.isInvalid()) { 1094 // The user provided a superfluous scope specifier inside a class 1095 // definition: 1096 // 1097 // class X { 1098 // int X::member; 1099 // }; 1100 DeclContext *DC = 0; 1101 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1102 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1103 << Name << FixItHint::CreateRemoval(SS.getRange()); 1104 else 1105 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1106 << Name << SS.getRange(); 1107 1108 SS.clear(); 1109 } 1110 1111 // FIXME: Check for template parameters! 1112 // FIXME: Check that the name is an identifier! 1113 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1114 AS); 1115 assert(Member && "HandleField never returns null"); 1116 } else { 1117 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1118 if (!Member) { 1119 return 0; 1120 } 1121 1122 // Non-instance-fields can't have a bitfield. 1123 if (BitWidth) { 1124 if (Member->isInvalidDecl()) { 1125 // don't emit another diagnostic. 1126 } else if (isa<VarDecl>(Member)) { 1127 // C++ 9.6p3: A bit-field shall not be a static member. 1128 // "static member 'A' cannot be a bit-field" 1129 Diag(Loc, diag::err_static_not_bitfield) 1130 << Name << BitWidth->getSourceRange(); 1131 } else if (isa<TypedefDecl>(Member)) { 1132 // "typedef member 'x' cannot be a bit-field" 1133 Diag(Loc, diag::err_typedef_not_bitfield) 1134 << Name << BitWidth->getSourceRange(); 1135 } else { 1136 // A function typedef ("typedef int f(); f a;"). 1137 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1138 Diag(Loc, diag::err_not_integral_type_bitfield) 1139 << Name << cast<ValueDecl>(Member)->getType() 1140 << BitWidth->getSourceRange(); 1141 } 1142 1143 BitWidth = 0; 1144 Member->setInvalidDecl(); 1145 } 1146 1147 Member->setAccess(AS); 1148 1149 // If we have declared a member function template, set the access of the 1150 // templated declaration as well. 1151 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1152 FunTmpl->getTemplatedDecl()->setAccess(AS); 1153 } 1154 1155 if (VS.isOverrideSpecified()) { 1156 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1157 if (!MD || !MD->isVirtual()) { 1158 Diag(Member->getLocStart(), 1159 diag::override_keyword_only_allowed_on_virtual_member_functions) 1160 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1161 } else 1162 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1163 } 1164 if (VS.isFinalSpecified()) { 1165 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1166 if (!MD || !MD->isVirtual()) { 1167 Diag(Member->getLocStart(), 1168 diag::override_keyword_only_allowed_on_virtual_member_functions) 1169 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1170 } else 1171 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1172 } 1173 1174 if (VS.getLastLocation().isValid()) { 1175 // Update the end location of a method that has a virt-specifiers. 1176 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1177 MD->setRangeEnd(VS.getLastLocation()); 1178 } 1179 1180 CheckOverrideControl(Member); 1181 1182 assert((Name || isInstField) && "No identifier for non-field ?"); 1183 1184 if (Init) 1185 AddInitializerToDecl(Member, Init, false, 1186 DS.getTypeSpecType() == DeclSpec::TST_auto); 1187 1188 FinalizeDeclaration(Member); 1189 1190 if (isInstField) 1191 FieldCollector->Add(cast<FieldDecl>(Member)); 1192 return Member; 1193} 1194 1195/// \brief Find the direct and/or virtual base specifiers that 1196/// correspond to the given base type, for use in base initialization 1197/// within a constructor. 1198static bool FindBaseInitializer(Sema &SemaRef, 1199 CXXRecordDecl *ClassDecl, 1200 QualType BaseType, 1201 const CXXBaseSpecifier *&DirectBaseSpec, 1202 const CXXBaseSpecifier *&VirtualBaseSpec) { 1203 // First, check for a direct base class. 1204 DirectBaseSpec = 0; 1205 for (CXXRecordDecl::base_class_const_iterator Base 1206 = ClassDecl->bases_begin(); 1207 Base != ClassDecl->bases_end(); ++Base) { 1208 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1209 // We found a direct base of this type. That's what we're 1210 // initializing. 1211 DirectBaseSpec = &*Base; 1212 break; 1213 } 1214 } 1215 1216 // Check for a virtual base class. 1217 // FIXME: We might be able to short-circuit this if we know in advance that 1218 // there are no virtual bases. 1219 VirtualBaseSpec = 0; 1220 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1221 // We haven't found a base yet; search the class hierarchy for a 1222 // virtual base class. 1223 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1224 /*DetectVirtual=*/false); 1225 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1226 BaseType, Paths)) { 1227 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1228 Path != Paths.end(); ++Path) { 1229 if (Path->back().Base->isVirtual()) { 1230 VirtualBaseSpec = Path->back().Base; 1231 break; 1232 } 1233 } 1234 } 1235 } 1236 1237 return DirectBaseSpec || VirtualBaseSpec; 1238} 1239 1240/// ActOnMemInitializer - Handle a C++ member initializer. 1241MemInitResult 1242Sema::ActOnMemInitializer(Decl *ConstructorD, 1243 Scope *S, 1244 CXXScopeSpec &SS, 1245 IdentifierInfo *MemberOrBase, 1246 ParsedType TemplateTypeTy, 1247 SourceLocation IdLoc, 1248 SourceLocation LParenLoc, 1249 ExprTy **Args, unsigned NumArgs, 1250 SourceLocation RParenLoc, 1251 SourceLocation EllipsisLoc) { 1252 if (!ConstructorD) 1253 return true; 1254 1255 AdjustDeclIfTemplate(ConstructorD); 1256 1257 CXXConstructorDecl *Constructor 1258 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1259 if (!Constructor) { 1260 // The user wrote a constructor initializer on a function that is 1261 // not a C++ constructor. Ignore the error for now, because we may 1262 // have more member initializers coming; we'll diagnose it just 1263 // once in ActOnMemInitializers. 1264 return true; 1265 } 1266 1267 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1268 1269 // C++ [class.base.init]p2: 1270 // Names in a mem-initializer-id are looked up in the scope of the 1271 // constructor's class and, if not found in that scope, are looked 1272 // up in the scope containing the constructor's definition. 1273 // [Note: if the constructor's class contains a member with the 1274 // same name as a direct or virtual base class of the class, a 1275 // mem-initializer-id naming the member or base class and composed 1276 // of a single identifier refers to the class member. A 1277 // mem-initializer-id for the hidden base class may be specified 1278 // using a qualified name. ] 1279 if (!SS.getScopeRep() && !TemplateTypeTy) { 1280 // Look for a member, first. 1281 FieldDecl *Member = 0; 1282 DeclContext::lookup_result Result 1283 = ClassDecl->lookup(MemberOrBase); 1284 if (Result.first != Result.second) { 1285 Member = dyn_cast<FieldDecl>(*Result.first); 1286 1287 if (Member) { 1288 if (EllipsisLoc.isValid()) 1289 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1290 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1291 1292 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1293 LParenLoc, RParenLoc); 1294 } 1295 1296 // Handle anonymous union case. 1297 if (IndirectFieldDecl* IndirectField 1298 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1299 if (EllipsisLoc.isValid()) 1300 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1301 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1302 1303 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1304 NumArgs, IdLoc, 1305 LParenLoc, RParenLoc); 1306 } 1307 } 1308 } 1309 // It didn't name a member, so see if it names a class. 1310 QualType BaseType; 1311 TypeSourceInfo *TInfo = 0; 1312 1313 if (TemplateTypeTy) { 1314 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1315 } else { 1316 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1317 LookupParsedName(R, S, &SS); 1318 1319 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1320 if (!TyD) { 1321 if (R.isAmbiguous()) return true; 1322 1323 // We don't want access-control diagnostics here. 1324 R.suppressDiagnostics(); 1325 1326 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1327 bool NotUnknownSpecialization = false; 1328 DeclContext *DC = computeDeclContext(SS, false); 1329 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1330 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1331 1332 if (!NotUnknownSpecialization) { 1333 // When the scope specifier can refer to a member of an unknown 1334 // specialization, we take it as a type name. 1335 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1336 SS.getWithLocInContext(Context), 1337 *MemberOrBase, IdLoc); 1338 if (BaseType.isNull()) 1339 return true; 1340 1341 R.clear(); 1342 R.setLookupName(MemberOrBase); 1343 } 1344 } 1345 1346 // If no results were found, try to correct typos. 1347 if (R.empty() && BaseType.isNull() && 1348 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1349 R.isSingleResult()) { 1350 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1351 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1352 // We have found a non-static data member with a similar 1353 // name to what was typed; complain and initialize that 1354 // member. 1355 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1356 << MemberOrBase << true << R.getLookupName() 1357 << FixItHint::CreateReplacement(R.getNameLoc(), 1358 R.getLookupName().getAsString()); 1359 Diag(Member->getLocation(), diag::note_previous_decl) 1360 << Member->getDeclName(); 1361 1362 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1363 LParenLoc, RParenLoc); 1364 } 1365 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1366 const CXXBaseSpecifier *DirectBaseSpec; 1367 const CXXBaseSpecifier *VirtualBaseSpec; 1368 if (FindBaseInitializer(*this, ClassDecl, 1369 Context.getTypeDeclType(Type), 1370 DirectBaseSpec, VirtualBaseSpec)) { 1371 // We have found a direct or virtual base class with a 1372 // similar name to what was typed; complain and initialize 1373 // that base class. 1374 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1375 << MemberOrBase << false << R.getLookupName() 1376 << FixItHint::CreateReplacement(R.getNameLoc(), 1377 R.getLookupName().getAsString()); 1378 1379 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1380 : VirtualBaseSpec; 1381 Diag(BaseSpec->getSourceRange().getBegin(), 1382 diag::note_base_class_specified_here) 1383 << BaseSpec->getType() 1384 << BaseSpec->getSourceRange(); 1385 1386 TyD = Type; 1387 } 1388 } 1389 } 1390 1391 if (!TyD && BaseType.isNull()) { 1392 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1393 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1394 return true; 1395 } 1396 } 1397 1398 if (BaseType.isNull()) { 1399 BaseType = Context.getTypeDeclType(TyD); 1400 if (SS.isSet()) { 1401 NestedNameSpecifier *Qualifier = 1402 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1403 1404 // FIXME: preserve source range information 1405 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1406 } 1407 } 1408 } 1409 1410 if (!TInfo) 1411 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1412 1413 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1414 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1415} 1416 1417/// Checks an initializer expression for use of uninitialized fields, such as 1418/// containing the field that is being initialized. Returns true if there is an 1419/// uninitialized field was used an updates the SourceLocation parameter; false 1420/// otherwise. 1421static bool InitExprContainsUninitializedFields(const Stmt *S, 1422 const ValueDecl *LhsField, 1423 SourceLocation *L) { 1424 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1425 1426 if (isa<CallExpr>(S)) { 1427 // Do not descend into function calls or constructors, as the use 1428 // of an uninitialized field may be valid. One would have to inspect 1429 // the contents of the function/ctor to determine if it is safe or not. 1430 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1431 // may be safe, depending on what the function/ctor does. 1432 return false; 1433 } 1434 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1435 const NamedDecl *RhsField = ME->getMemberDecl(); 1436 1437 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1438 // The member expression points to a static data member. 1439 assert(VD->isStaticDataMember() && 1440 "Member points to non-static data member!"); 1441 (void)VD; 1442 return false; 1443 } 1444 1445 if (isa<EnumConstantDecl>(RhsField)) { 1446 // The member expression points to an enum. 1447 return false; 1448 } 1449 1450 if (RhsField == LhsField) { 1451 // Initializing a field with itself. Throw a warning. 1452 // But wait; there are exceptions! 1453 // Exception #1: The field may not belong to this record. 1454 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1455 const Expr *base = ME->getBase(); 1456 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1457 // Even though the field matches, it does not belong to this record. 1458 return false; 1459 } 1460 // None of the exceptions triggered; return true to indicate an 1461 // uninitialized field was used. 1462 *L = ME->getMemberLoc(); 1463 return true; 1464 } 1465 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1466 // sizeof/alignof doesn't reference contents, do not warn. 1467 return false; 1468 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1469 // address-of doesn't reference contents (the pointer may be dereferenced 1470 // in the same expression but it would be rare; and weird). 1471 if (UOE->getOpcode() == UO_AddrOf) 1472 return false; 1473 } 1474 for (Stmt::const_child_range it = S->children(); it; ++it) { 1475 if (!*it) { 1476 // An expression such as 'member(arg ?: "")' may trigger this. 1477 continue; 1478 } 1479 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1480 return true; 1481 } 1482 return false; 1483} 1484 1485MemInitResult 1486Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1487 unsigned NumArgs, SourceLocation IdLoc, 1488 SourceLocation LParenLoc, 1489 SourceLocation RParenLoc) { 1490 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1491 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1492 assert((DirectMember || IndirectMember) && 1493 "Member must be a FieldDecl or IndirectFieldDecl"); 1494 1495 if (Member->isInvalidDecl()) 1496 return true; 1497 1498 // Diagnose value-uses of fields to initialize themselves, e.g. 1499 // foo(foo) 1500 // where foo is not also a parameter to the constructor. 1501 // TODO: implement -Wuninitialized and fold this into that framework. 1502 for (unsigned i = 0; i < NumArgs; ++i) { 1503 SourceLocation L; 1504 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1505 // FIXME: Return true in the case when other fields are used before being 1506 // uninitialized. For example, let this field be the i'th field. When 1507 // initializing the i'th field, throw a warning if any of the >= i'th 1508 // fields are used, as they are not yet initialized. 1509 // Right now we are only handling the case where the i'th field uses 1510 // itself in its initializer. 1511 Diag(L, diag::warn_field_is_uninit); 1512 } 1513 } 1514 1515 bool HasDependentArg = false; 1516 for (unsigned i = 0; i < NumArgs; i++) 1517 HasDependentArg |= Args[i]->isTypeDependent(); 1518 1519 Expr *Init; 1520 if (Member->getType()->isDependentType() || HasDependentArg) { 1521 // Can't check initialization for a member of dependent type or when 1522 // any of the arguments are type-dependent expressions. 1523 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1524 RParenLoc); 1525 1526 // Erase any temporaries within this evaluation context; we're not 1527 // going to track them in the AST, since we'll be rebuilding the 1528 // ASTs during template instantiation. 1529 ExprTemporaries.erase( 1530 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1531 ExprTemporaries.end()); 1532 } else { 1533 // Initialize the member. 1534 InitializedEntity MemberEntity = 1535 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1536 : InitializedEntity::InitializeMember(IndirectMember, 0); 1537 InitializationKind Kind = 1538 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1539 1540 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1541 1542 ExprResult MemberInit = 1543 InitSeq.Perform(*this, MemberEntity, Kind, 1544 MultiExprArg(*this, Args, NumArgs), 0); 1545 if (MemberInit.isInvalid()) 1546 return true; 1547 1548 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1549 1550 // C++0x [class.base.init]p7: 1551 // The initialization of each base and member constitutes a 1552 // full-expression. 1553 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1554 if (MemberInit.isInvalid()) 1555 return true; 1556 1557 // If we are in a dependent context, template instantiation will 1558 // perform this type-checking again. Just save the arguments that we 1559 // received in a ParenListExpr. 1560 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1561 // of the information that we have about the member 1562 // initializer. However, deconstructing the ASTs is a dicey process, 1563 // and this approach is far more likely to get the corner cases right. 1564 if (CurContext->isDependentContext()) 1565 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1566 RParenLoc); 1567 else 1568 Init = MemberInit.get(); 1569 } 1570 1571 if (DirectMember) { 1572 return new (Context) CXXCtorInitializer(Context, DirectMember, 1573 IdLoc, LParenLoc, Init, 1574 RParenLoc); 1575 } else { 1576 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1577 IdLoc, LParenLoc, Init, 1578 RParenLoc); 1579 } 1580} 1581 1582MemInitResult 1583Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1584 Expr **Args, unsigned NumArgs, 1585 SourceLocation NameLoc, 1586 SourceLocation LParenLoc, 1587 SourceLocation RParenLoc, 1588 CXXRecordDecl *ClassDecl) { 1589 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1590 if (!LangOpts.CPlusPlus0x) 1591 return Diag(Loc, diag::err_delegation_0x_only) 1592 << TInfo->getTypeLoc().getLocalSourceRange(); 1593 1594 // Initialize the object. 1595 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1596 QualType(ClassDecl->getTypeForDecl(), 0)); 1597 InitializationKind Kind = 1598 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1599 1600 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1601 1602 ExprResult DelegationInit = 1603 InitSeq.Perform(*this, DelegationEntity, Kind, 1604 MultiExprArg(*this, Args, NumArgs), 0); 1605 if (DelegationInit.isInvalid()) 1606 return true; 1607 1608 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1609 CXXConstructorDecl *Constructor 1610 = ConExpr->getConstructor(); 1611 assert(Constructor && "Delegating constructor with no target?"); 1612 1613 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1614 1615 // C++0x [class.base.init]p7: 1616 // The initialization of each base and member constitutes a 1617 // full-expression. 1618 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1619 if (DelegationInit.isInvalid()) 1620 return true; 1621 1622 // If we are in a dependent context, template instantiation will 1623 // perform this type-checking again. Just save the arguments that we 1624 // received in a ParenListExpr. 1625 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1626 // of the information that we have about the base 1627 // initializer. However, deconstructing the ASTs is a dicey process, 1628 // and this approach is far more likely to get the corner cases right. 1629 if (CurContext->isDependentContext()) { 1630 ExprResult Init 1631 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1632 NumArgs, RParenLoc)); 1633 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1634 Constructor, Init.takeAs<Expr>(), 1635 RParenLoc); 1636 } 1637 1638 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1639 DelegationInit.takeAs<Expr>(), 1640 RParenLoc); 1641} 1642 1643MemInitResult 1644Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1645 Expr **Args, unsigned NumArgs, 1646 SourceLocation LParenLoc, SourceLocation RParenLoc, 1647 CXXRecordDecl *ClassDecl, 1648 SourceLocation EllipsisLoc) { 1649 bool HasDependentArg = false; 1650 for (unsigned i = 0; i < NumArgs; i++) 1651 HasDependentArg |= Args[i]->isTypeDependent(); 1652 1653 SourceLocation BaseLoc 1654 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1655 1656 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1657 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1658 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1659 1660 // C++ [class.base.init]p2: 1661 // [...] Unless the mem-initializer-id names a nonstatic data 1662 // member of the constructor's class or a direct or virtual base 1663 // of that class, the mem-initializer is ill-formed. A 1664 // mem-initializer-list can initialize a base class using any 1665 // name that denotes that base class type. 1666 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1667 1668 if (EllipsisLoc.isValid()) { 1669 // This is a pack expansion. 1670 if (!BaseType->containsUnexpandedParameterPack()) { 1671 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1672 << SourceRange(BaseLoc, RParenLoc); 1673 1674 EllipsisLoc = SourceLocation(); 1675 } 1676 } else { 1677 // Check for any unexpanded parameter packs. 1678 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1679 return true; 1680 1681 for (unsigned I = 0; I != NumArgs; ++I) 1682 if (DiagnoseUnexpandedParameterPack(Args[I])) 1683 return true; 1684 } 1685 1686 // Check for direct and virtual base classes. 1687 const CXXBaseSpecifier *DirectBaseSpec = 0; 1688 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1689 if (!Dependent) { 1690 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1691 BaseType)) 1692 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1693 LParenLoc, RParenLoc, ClassDecl); 1694 1695 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1696 VirtualBaseSpec); 1697 1698 // C++ [base.class.init]p2: 1699 // Unless the mem-initializer-id names a nonstatic data member of the 1700 // constructor's class or a direct or virtual base of that class, the 1701 // mem-initializer is ill-formed. 1702 if (!DirectBaseSpec && !VirtualBaseSpec) { 1703 // If the class has any dependent bases, then it's possible that 1704 // one of those types will resolve to the same type as 1705 // BaseType. Therefore, just treat this as a dependent base 1706 // class initialization. FIXME: Should we try to check the 1707 // initialization anyway? It seems odd. 1708 if (ClassDecl->hasAnyDependentBases()) 1709 Dependent = true; 1710 else 1711 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1712 << BaseType << Context.getTypeDeclType(ClassDecl) 1713 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1714 } 1715 } 1716 1717 if (Dependent) { 1718 // Can't check initialization for a base of dependent type or when 1719 // any of the arguments are type-dependent expressions. 1720 ExprResult BaseInit 1721 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1722 RParenLoc)); 1723 1724 // Erase any temporaries within this evaluation context; we're not 1725 // going to track them in the AST, since we'll be rebuilding the 1726 // ASTs during template instantiation. 1727 ExprTemporaries.erase( 1728 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1729 ExprTemporaries.end()); 1730 1731 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1732 /*IsVirtual=*/false, 1733 LParenLoc, 1734 BaseInit.takeAs<Expr>(), 1735 RParenLoc, 1736 EllipsisLoc); 1737 } 1738 1739 // C++ [base.class.init]p2: 1740 // If a mem-initializer-id is ambiguous because it designates both 1741 // a direct non-virtual base class and an inherited virtual base 1742 // class, the mem-initializer is ill-formed. 1743 if (DirectBaseSpec && VirtualBaseSpec) 1744 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1745 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1746 1747 CXXBaseSpecifier *BaseSpec 1748 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1749 if (!BaseSpec) 1750 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1751 1752 // Initialize the base. 1753 InitializedEntity BaseEntity = 1754 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1755 InitializationKind Kind = 1756 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1757 1758 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1759 1760 ExprResult BaseInit = 1761 InitSeq.Perform(*this, BaseEntity, Kind, 1762 MultiExprArg(*this, Args, NumArgs), 0); 1763 if (BaseInit.isInvalid()) 1764 return true; 1765 1766 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1767 1768 // C++0x [class.base.init]p7: 1769 // The initialization of each base and member constitutes a 1770 // full-expression. 1771 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1772 if (BaseInit.isInvalid()) 1773 return true; 1774 1775 // If we are in a dependent context, template instantiation will 1776 // perform this type-checking again. Just save the arguments that we 1777 // received in a ParenListExpr. 1778 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1779 // of the information that we have about the base 1780 // initializer. However, deconstructing the ASTs is a dicey process, 1781 // and this approach is far more likely to get the corner cases right. 1782 if (CurContext->isDependentContext()) { 1783 ExprResult Init 1784 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1785 RParenLoc)); 1786 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1787 BaseSpec->isVirtual(), 1788 LParenLoc, 1789 Init.takeAs<Expr>(), 1790 RParenLoc, 1791 EllipsisLoc); 1792 } 1793 1794 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1795 BaseSpec->isVirtual(), 1796 LParenLoc, 1797 BaseInit.takeAs<Expr>(), 1798 RParenLoc, 1799 EllipsisLoc); 1800} 1801 1802/// ImplicitInitializerKind - How an implicit base or member initializer should 1803/// initialize its base or member. 1804enum ImplicitInitializerKind { 1805 IIK_Default, 1806 IIK_Copy, 1807 IIK_Move 1808}; 1809 1810static bool 1811BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1812 ImplicitInitializerKind ImplicitInitKind, 1813 CXXBaseSpecifier *BaseSpec, 1814 bool IsInheritedVirtualBase, 1815 CXXCtorInitializer *&CXXBaseInit) { 1816 InitializedEntity InitEntity 1817 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1818 IsInheritedVirtualBase); 1819 1820 ExprResult BaseInit; 1821 1822 switch (ImplicitInitKind) { 1823 case IIK_Default: { 1824 InitializationKind InitKind 1825 = InitializationKind::CreateDefault(Constructor->getLocation()); 1826 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1827 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1828 MultiExprArg(SemaRef, 0, 0)); 1829 break; 1830 } 1831 1832 case IIK_Copy: { 1833 ParmVarDecl *Param = Constructor->getParamDecl(0); 1834 QualType ParamType = Param->getType().getNonReferenceType(); 1835 1836 Expr *CopyCtorArg = 1837 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1838 Constructor->getLocation(), ParamType, 1839 VK_LValue, 0); 1840 1841 // Cast to the base class to avoid ambiguities. 1842 QualType ArgTy = 1843 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1844 ParamType.getQualifiers()); 1845 1846 CXXCastPath BasePath; 1847 BasePath.push_back(BaseSpec); 1848 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1849 CK_UncheckedDerivedToBase, 1850 VK_LValue, &BasePath).take(); 1851 1852 InitializationKind InitKind 1853 = InitializationKind::CreateDirect(Constructor->getLocation(), 1854 SourceLocation(), SourceLocation()); 1855 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1856 &CopyCtorArg, 1); 1857 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1858 MultiExprArg(&CopyCtorArg, 1)); 1859 break; 1860 } 1861 1862 case IIK_Move: 1863 assert(false && "Unhandled initializer kind!"); 1864 } 1865 1866 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1867 if (BaseInit.isInvalid()) 1868 return true; 1869 1870 CXXBaseInit = 1871 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1872 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1873 SourceLocation()), 1874 BaseSpec->isVirtual(), 1875 SourceLocation(), 1876 BaseInit.takeAs<Expr>(), 1877 SourceLocation(), 1878 SourceLocation()); 1879 1880 return false; 1881} 1882 1883static bool 1884BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1885 ImplicitInitializerKind ImplicitInitKind, 1886 FieldDecl *Field, 1887 CXXCtorInitializer *&CXXMemberInit) { 1888 if (Field->isInvalidDecl()) 1889 return true; 1890 1891 SourceLocation Loc = Constructor->getLocation(); 1892 1893 if (ImplicitInitKind == IIK_Copy) { 1894 ParmVarDecl *Param = Constructor->getParamDecl(0); 1895 QualType ParamType = Param->getType().getNonReferenceType(); 1896 1897 Expr *MemberExprBase = 1898 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1899 Loc, ParamType, VK_LValue, 0); 1900 1901 // Build a reference to this field within the parameter. 1902 CXXScopeSpec SS; 1903 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1904 Sema::LookupMemberName); 1905 MemberLookup.addDecl(Field, AS_public); 1906 MemberLookup.resolveKind(); 1907 ExprResult CopyCtorArg 1908 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1909 ParamType, Loc, 1910 /*IsArrow=*/false, 1911 SS, 1912 /*FirstQualifierInScope=*/0, 1913 MemberLookup, 1914 /*TemplateArgs=*/0); 1915 if (CopyCtorArg.isInvalid()) 1916 return true; 1917 1918 // When the field we are copying is an array, create index variables for 1919 // each dimension of the array. We use these index variables to subscript 1920 // the source array, and other clients (e.g., CodeGen) will perform the 1921 // necessary iteration with these index variables. 1922 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1923 QualType BaseType = Field->getType(); 1924 QualType SizeType = SemaRef.Context.getSizeType(); 1925 while (const ConstantArrayType *Array 1926 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1927 // Create the iteration variable for this array index. 1928 IdentifierInfo *IterationVarName = 0; 1929 { 1930 llvm::SmallString<8> Str; 1931 llvm::raw_svector_ostream OS(Str); 1932 OS << "__i" << IndexVariables.size(); 1933 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1934 } 1935 VarDecl *IterationVar 1936 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1937 IterationVarName, SizeType, 1938 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1939 SC_None, SC_None); 1940 IndexVariables.push_back(IterationVar); 1941 1942 // Create a reference to the iteration variable. 1943 ExprResult IterationVarRef 1944 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1945 assert(!IterationVarRef.isInvalid() && 1946 "Reference to invented variable cannot fail!"); 1947 1948 // Subscript the array with this iteration variable. 1949 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1950 Loc, 1951 IterationVarRef.take(), 1952 Loc); 1953 if (CopyCtorArg.isInvalid()) 1954 return true; 1955 1956 BaseType = Array->getElementType(); 1957 } 1958 1959 // Construct the entity that we will be initializing. For an array, this 1960 // will be first element in the array, which may require several levels 1961 // of array-subscript entities. 1962 llvm::SmallVector<InitializedEntity, 4> Entities; 1963 Entities.reserve(1 + IndexVariables.size()); 1964 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1965 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1966 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1967 0, 1968 Entities.back())); 1969 1970 // Direct-initialize to use the copy constructor. 1971 InitializationKind InitKind = 1972 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1973 1974 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1975 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1976 &CopyCtorArgE, 1); 1977 1978 ExprResult MemberInit 1979 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1980 MultiExprArg(&CopyCtorArgE, 1)); 1981 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1982 if (MemberInit.isInvalid()) 1983 return true; 1984 1985 CXXMemberInit 1986 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1987 MemberInit.takeAs<Expr>(), Loc, 1988 IndexVariables.data(), 1989 IndexVariables.size()); 1990 return false; 1991 } 1992 1993 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1994 1995 QualType FieldBaseElementType = 1996 SemaRef.Context.getBaseElementType(Field->getType()); 1997 1998 if (FieldBaseElementType->isRecordType()) { 1999 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2000 InitializationKind InitKind = 2001 InitializationKind::CreateDefault(Loc); 2002 2003 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2004 ExprResult MemberInit = 2005 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2006 2007 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2008 if (MemberInit.isInvalid()) 2009 return true; 2010 2011 CXXMemberInit = 2012 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2013 Field, Loc, Loc, 2014 MemberInit.get(), 2015 Loc); 2016 return false; 2017 } 2018 2019 if (FieldBaseElementType->isReferenceType()) { 2020 SemaRef.Diag(Constructor->getLocation(), 2021 diag::err_uninitialized_member_in_ctor) 2022 << (int)Constructor->isImplicit() 2023 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2024 << 0 << Field->getDeclName(); 2025 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2026 return true; 2027 } 2028 2029 if (FieldBaseElementType.isConstQualified()) { 2030 SemaRef.Diag(Constructor->getLocation(), 2031 diag::err_uninitialized_member_in_ctor) 2032 << (int)Constructor->isImplicit() 2033 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2034 << 1 << Field->getDeclName(); 2035 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2036 return true; 2037 } 2038 2039 // Nothing to initialize. 2040 CXXMemberInit = 0; 2041 return false; 2042} 2043 2044namespace { 2045struct BaseAndFieldInfo { 2046 Sema &S; 2047 CXXConstructorDecl *Ctor; 2048 bool AnyErrorsInInits; 2049 ImplicitInitializerKind IIK; 2050 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2051 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2052 2053 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2054 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2055 // FIXME: Handle implicit move constructors. 2056 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2057 IIK = IIK_Copy; 2058 else 2059 IIK = IIK_Default; 2060 } 2061}; 2062} 2063 2064static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2065 FieldDecl *Top, FieldDecl *Field) { 2066 2067 // Overwhelmingly common case: we have a direct initializer for this field. 2068 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2069 Info.AllToInit.push_back(Init); 2070 return false; 2071 } 2072 2073 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2074 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2075 assert(FieldClassType && "anonymous struct/union without record type"); 2076 CXXRecordDecl *FieldClassDecl 2077 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2078 2079 // Even though union members never have non-trivial default 2080 // constructions in C++03, we still build member initializers for aggregate 2081 // record types which can be union members, and C++0x allows non-trivial 2082 // default constructors for union members, so we ensure that only one 2083 // member is initialized for these. 2084 if (FieldClassDecl->isUnion()) { 2085 // First check for an explicit initializer for one field. 2086 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2087 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2088 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2089 Info.AllToInit.push_back(Init); 2090 2091 // Once we've initialized a field of an anonymous union, the union 2092 // field in the class is also initialized, so exit immediately. 2093 return false; 2094 } else if ((*FA)->isAnonymousStructOrUnion()) { 2095 if (CollectFieldInitializer(Info, Top, *FA)) 2096 return true; 2097 } 2098 } 2099 2100 // Fallthrough and construct a default initializer for the union as 2101 // a whole, which can call its default constructor if such a thing exists 2102 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2103 // behavior going forward with C++0x, when anonymous unions there are 2104 // finalized, we should revisit this. 2105 } else { 2106 // For structs, we simply descend through to initialize all members where 2107 // necessary. 2108 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2109 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2110 if (CollectFieldInitializer(Info, Top, *FA)) 2111 return true; 2112 } 2113 } 2114 } 2115 2116 // Don't try to build an implicit initializer if there were semantic 2117 // errors in any of the initializers (and therefore we might be 2118 // missing some that the user actually wrote). 2119 if (Info.AnyErrorsInInits) 2120 return false; 2121 2122 CXXCtorInitializer *Init = 0; 2123 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2124 return true; 2125 2126 if (Init) 2127 Info.AllToInit.push_back(Init); 2128 2129 return false; 2130} 2131 2132bool 2133Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2134 CXXCtorInitializer *Initializer) { 2135 assert(Initializer->isDelegatingInitializer()); 2136 Constructor->setNumCtorInitializers(1); 2137 CXXCtorInitializer **initializer = 2138 new (Context) CXXCtorInitializer*[1]; 2139 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2140 Constructor->setCtorInitializers(initializer); 2141 2142 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2143 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2144 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2145 } 2146 2147 DelegatingCtorDecls.push_back(Constructor); 2148 2149 return false; 2150} 2151 2152bool 2153Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2154 CXXCtorInitializer **Initializers, 2155 unsigned NumInitializers, 2156 bool AnyErrors) { 2157 if (Constructor->getDeclContext()->isDependentContext()) { 2158 // Just store the initializers as written, they will be checked during 2159 // instantiation. 2160 if (NumInitializers > 0) { 2161 Constructor->setNumCtorInitializers(NumInitializers); 2162 CXXCtorInitializer **baseOrMemberInitializers = 2163 new (Context) CXXCtorInitializer*[NumInitializers]; 2164 memcpy(baseOrMemberInitializers, Initializers, 2165 NumInitializers * sizeof(CXXCtorInitializer*)); 2166 Constructor->setCtorInitializers(baseOrMemberInitializers); 2167 } 2168 2169 return false; 2170 } 2171 2172 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2173 2174 // We need to build the initializer AST according to order of construction 2175 // and not what user specified in the Initializers list. 2176 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2177 if (!ClassDecl) 2178 return true; 2179 2180 bool HadError = false; 2181 2182 for (unsigned i = 0; i < NumInitializers; i++) { 2183 CXXCtorInitializer *Member = Initializers[i]; 2184 2185 if (Member->isBaseInitializer()) 2186 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2187 else 2188 Info.AllBaseFields[Member->getAnyMember()] = Member; 2189 } 2190 2191 // Keep track of the direct virtual bases. 2192 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2193 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2194 E = ClassDecl->bases_end(); I != E; ++I) { 2195 if (I->isVirtual()) 2196 DirectVBases.insert(I); 2197 } 2198 2199 // Push virtual bases before others. 2200 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2201 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2202 2203 if (CXXCtorInitializer *Value 2204 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2205 Info.AllToInit.push_back(Value); 2206 } else if (!AnyErrors) { 2207 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2208 CXXCtorInitializer *CXXBaseInit; 2209 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2210 VBase, IsInheritedVirtualBase, 2211 CXXBaseInit)) { 2212 HadError = true; 2213 continue; 2214 } 2215 2216 Info.AllToInit.push_back(CXXBaseInit); 2217 } 2218 } 2219 2220 // Non-virtual bases. 2221 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2222 E = ClassDecl->bases_end(); Base != E; ++Base) { 2223 // Virtuals are in the virtual base list and already constructed. 2224 if (Base->isVirtual()) 2225 continue; 2226 2227 if (CXXCtorInitializer *Value 2228 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2229 Info.AllToInit.push_back(Value); 2230 } else if (!AnyErrors) { 2231 CXXCtorInitializer *CXXBaseInit; 2232 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2233 Base, /*IsInheritedVirtualBase=*/false, 2234 CXXBaseInit)) { 2235 HadError = true; 2236 continue; 2237 } 2238 2239 Info.AllToInit.push_back(CXXBaseInit); 2240 } 2241 } 2242 2243 // Fields. 2244 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2245 E = ClassDecl->field_end(); Field != E; ++Field) { 2246 if ((*Field)->getType()->isIncompleteArrayType()) { 2247 assert(ClassDecl->hasFlexibleArrayMember() && 2248 "Incomplete array type is not valid"); 2249 continue; 2250 } 2251 if (CollectFieldInitializer(Info, *Field, *Field)) 2252 HadError = true; 2253 } 2254 2255 NumInitializers = Info.AllToInit.size(); 2256 if (NumInitializers > 0) { 2257 Constructor->setNumCtorInitializers(NumInitializers); 2258 CXXCtorInitializer **baseOrMemberInitializers = 2259 new (Context) CXXCtorInitializer*[NumInitializers]; 2260 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2261 NumInitializers * sizeof(CXXCtorInitializer*)); 2262 Constructor->setCtorInitializers(baseOrMemberInitializers); 2263 2264 // Constructors implicitly reference the base and member 2265 // destructors. 2266 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2267 Constructor->getParent()); 2268 } 2269 2270 return HadError; 2271} 2272 2273static void *GetKeyForTopLevelField(FieldDecl *Field) { 2274 // For anonymous unions, use the class declaration as the key. 2275 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2276 if (RT->getDecl()->isAnonymousStructOrUnion()) 2277 return static_cast<void *>(RT->getDecl()); 2278 } 2279 return static_cast<void *>(Field); 2280} 2281 2282static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2283 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2284} 2285 2286static void *GetKeyForMember(ASTContext &Context, 2287 CXXCtorInitializer *Member) { 2288 if (!Member->isAnyMemberInitializer()) 2289 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2290 2291 // For fields injected into the class via declaration of an anonymous union, 2292 // use its anonymous union class declaration as the unique key. 2293 FieldDecl *Field = Member->getAnyMember(); 2294 2295 // If the field is a member of an anonymous struct or union, our key 2296 // is the anonymous record decl that's a direct child of the class. 2297 RecordDecl *RD = Field->getParent(); 2298 if (RD->isAnonymousStructOrUnion()) { 2299 while (true) { 2300 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2301 if (Parent->isAnonymousStructOrUnion()) 2302 RD = Parent; 2303 else 2304 break; 2305 } 2306 2307 return static_cast<void *>(RD); 2308 } 2309 2310 return static_cast<void *>(Field); 2311} 2312 2313static void 2314DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2315 const CXXConstructorDecl *Constructor, 2316 CXXCtorInitializer **Inits, 2317 unsigned NumInits) { 2318 if (Constructor->getDeclContext()->isDependentContext()) 2319 return; 2320 2321 // Don't check initializers order unless the warning is enabled at the 2322 // location of at least one initializer. 2323 bool ShouldCheckOrder = false; 2324 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2325 CXXCtorInitializer *Init = Inits[InitIndex]; 2326 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2327 Init->getSourceLocation()) 2328 != Diagnostic::Ignored) { 2329 ShouldCheckOrder = true; 2330 break; 2331 } 2332 } 2333 if (!ShouldCheckOrder) 2334 return; 2335 2336 // Build the list of bases and members in the order that they'll 2337 // actually be initialized. The explicit initializers should be in 2338 // this same order but may be missing things. 2339 llvm::SmallVector<const void*, 32> IdealInitKeys; 2340 2341 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2342 2343 // 1. Virtual bases. 2344 for (CXXRecordDecl::base_class_const_iterator VBase = 2345 ClassDecl->vbases_begin(), 2346 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2347 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2348 2349 // 2. Non-virtual bases. 2350 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2351 E = ClassDecl->bases_end(); Base != E; ++Base) { 2352 if (Base->isVirtual()) 2353 continue; 2354 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2355 } 2356 2357 // 3. Direct fields. 2358 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2359 E = ClassDecl->field_end(); Field != E; ++Field) 2360 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2361 2362 unsigned NumIdealInits = IdealInitKeys.size(); 2363 unsigned IdealIndex = 0; 2364 2365 CXXCtorInitializer *PrevInit = 0; 2366 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2367 CXXCtorInitializer *Init = Inits[InitIndex]; 2368 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2369 2370 // Scan forward to try to find this initializer in the idealized 2371 // initializers list. 2372 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2373 if (InitKey == IdealInitKeys[IdealIndex]) 2374 break; 2375 2376 // If we didn't find this initializer, it must be because we 2377 // scanned past it on a previous iteration. That can only 2378 // happen if we're out of order; emit a warning. 2379 if (IdealIndex == NumIdealInits && PrevInit) { 2380 Sema::SemaDiagnosticBuilder D = 2381 SemaRef.Diag(PrevInit->getSourceLocation(), 2382 diag::warn_initializer_out_of_order); 2383 2384 if (PrevInit->isAnyMemberInitializer()) 2385 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2386 else 2387 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2388 2389 if (Init->isAnyMemberInitializer()) 2390 D << 0 << Init->getAnyMember()->getDeclName(); 2391 else 2392 D << 1 << Init->getBaseClassInfo()->getType(); 2393 2394 // Move back to the initializer's location in the ideal list. 2395 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2396 if (InitKey == IdealInitKeys[IdealIndex]) 2397 break; 2398 2399 assert(IdealIndex != NumIdealInits && 2400 "initializer not found in initializer list"); 2401 } 2402 2403 PrevInit = Init; 2404 } 2405} 2406 2407namespace { 2408bool CheckRedundantInit(Sema &S, 2409 CXXCtorInitializer *Init, 2410 CXXCtorInitializer *&PrevInit) { 2411 if (!PrevInit) { 2412 PrevInit = Init; 2413 return false; 2414 } 2415 2416 if (FieldDecl *Field = Init->getMember()) 2417 S.Diag(Init->getSourceLocation(), 2418 diag::err_multiple_mem_initialization) 2419 << Field->getDeclName() 2420 << Init->getSourceRange(); 2421 else { 2422 const Type *BaseClass = Init->getBaseClass(); 2423 assert(BaseClass && "neither field nor base"); 2424 S.Diag(Init->getSourceLocation(), 2425 diag::err_multiple_base_initialization) 2426 << QualType(BaseClass, 0) 2427 << Init->getSourceRange(); 2428 } 2429 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2430 << 0 << PrevInit->getSourceRange(); 2431 2432 return true; 2433} 2434 2435typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2436typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2437 2438bool CheckRedundantUnionInit(Sema &S, 2439 CXXCtorInitializer *Init, 2440 RedundantUnionMap &Unions) { 2441 FieldDecl *Field = Init->getAnyMember(); 2442 RecordDecl *Parent = Field->getParent(); 2443 if (!Parent->isAnonymousStructOrUnion()) 2444 return false; 2445 2446 NamedDecl *Child = Field; 2447 do { 2448 if (Parent->isUnion()) { 2449 UnionEntry &En = Unions[Parent]; 2450 if (En.first && En.first != Child) { 2451 S.Diag(Init->getSourceLocation(), 2452 diag::err_multiple_mem_union_initialization) 2453 << Field->getDeclName() 2454 << Init->getSourceRange(); 2455 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2456 << 0 << En.second->getSourceRange(); 2457 return true; 2458 } else if (!En.first) { 2459 En.first = Child; 2460 En.second = Init; 2461 } 2462 } 2463 2464 Child = Parent; 2465 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2466 } while (Parent->isAnonymousStructOrUnion()); 2467 2468 return false; 2469} 2470} 2471 2472/// ActOnMemInitializers - Handle the member initializers for a constructor. 2473void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2474 SourceLocation ColonLoc, 2475 MemInitTy **meminits, unsigned NumMemInits, 2476 bool AnyErrors) { 2477 if (!ConstructorDecl) 2478 return; 2479 2480 AdjustDeclIfTemplate(ConstructorDecl); 2481 2482 CXXConstructorDecl *Constructor 2483 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2484 2485 if (!Constructor) { 2486 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2487 return; 2488 } 2489 2490 CXXCtorInitializer **MemInits = 2491 reinterpret_cast<CXXCtorInitializer **>(meminits); 2492 2493 // Mapping for the duplicate initializers check. 2494 // For member initializers, this is keyed with a FieldDecl*. 2495 // For base initializers, this is keyed with a Type*. 2496 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2497 2498 // Mapping for the inconsistent anonymous-union initializers check. 2499 RedundantUnionMap MemberUnions; 2500 2501 bool HadError = false; 2502 for (unsigned i = 0; i < NumMemInits; i++) { 2503 CXXCtorInitializer *Init = MemInits[i]; 2504 2505 // Set the source order index. 2506 Init->setSourceOrder(i); 2507 2508 if (Init->isAnyMemberInitializer()) { 2509 FieldDecl *Field = Init->getAnyMember(); 2510 if (CheckRedundantInit(*this, Init, Members[Field]) || 2511 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2512 HadError = true; 2513 } else if (Init->isBaseInitializer()) { 2514 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2515 if (CheckRedundantInit(*this, Init, Members[Key])) 2516 HadError = true; 2517 } else { 2518 assert(Init->isDelegatingInitializer()); 2519 // This must be the only initializer 2520 if (i != 0 || NumMemInits > 1) { 2521 Diag(MemInits[0]->getSourceLocation(), 2522 diag::err_delegating_initializer_alone) 2523 << MemInits[0]->getSourceRange(); 2524 HadError = true; 2525 // We will treat this as being the only initializer. 2526 } 2527 SetDelegatingInitializer(Constructor, MemInits[i]); 2528 // Return immediately as the initializer is set. 2529 return; 2530 } 2531 } 2532 2533 if (HadError) 2534 return; 2535 2536 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2537 2538 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2539} 2540 2541void 2542Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2543 CXXRecordDecl *ClassDecl) { 2544 // Ignore dependent contexts. 2545 if (ClassDecl->isDependentContext()) 2546 return; 2547 2548 // FIXME: all the access-control diagnostics are positioned on the 2549 // field/base declaration. That's probably good; that said, the 2550 // user might reasonably want to know why the destructor is being 2551 // emitted, and we currently don't say. 2552 2553 // Non-static data members. 2554 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2555 E = ClassDecl->field_end(); I != E; ++I) { 2556 FieldDecl *Field = *I; 2557 if (Field->isInvalidDecl()) 2558 continue; 2559 QualType FieldType = Context.getBaseElementType(Field->getType()); 2560 2561 const RecordType* RT = FieldType->getAs<RecordType>(); 2562 if (!RT) 2563 continue; 2564 2565 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2566 if (FieldClassDecl->isInvalidDecl()) 2567 continue; 2568 if (FieldClassDecl->hasTrivialDestructor()) 2569 continue; 2570 2571 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2572 assert(Dtor && "No dtor found for FieldClassDecl!"); 2573 CheckDestructorAccess(Field->getLocation(), Dtor, 2574 PDiag(diag::err_access_dtor_field) 2575 << Field->getDeclName() 2576 << FieldType); 2577 2578 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2579 } 2580 2581 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2582 2583 // Bases. 2584 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2585 E = ClassDecl->bases_end(); Base != E; ++Base) { 2586 // Bases are always records in a well-formed non-dependent class. 2587 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2588 2589 // Remember direct virtual bases. 2590 if (Base->isVirtual()) 2591 DirectVirtualBases.insert(RT); 2592 2593 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2594 // If our base class is invalid, we probably can't get its dtor anyway. 2595 if (BaseClassDecl->isInvalidDecl()) 2596 continue; 2597 // Ignore trivial destructors. 2598 if (BaseClassDecl->hasTrivialDestructor()) 2599 continue; 2600 2601 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2602 assert(Dtor && "No dtor found for BaseClassDecl!"); 2603 2604 // FIXME: caret should be on the start of the class name 2605 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2606 PDiag(diag::err_access_dtor_base) 2607 << Base->getType() 2608 << Base->getSourceRange()); 2609 2610 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2611 } 2612 2613 // Virtual bases. 2614 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2615 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2616 2617 // Bases are always records in a well-formed non-dependent class. 2618 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2619 2620 // Ignore direct virtual bases. 2621 if (DirectVirtualBases.count(RT)) 2622 continue; 2623 2624 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2625 // If our base class is invalid, we probably can't get its dtor anyway. 2626 if (BaseClassDecl->isInvalidDecl()) 2627 continue; 2628 // Ignore trivial destructors. 2629 if (BaseClassDecl->hasTrivialDestructor()) 2630 continue; 2631 2632 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2633 assert(Dtor && "No dtor found for BaseClassDecl!"); 2634 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2635 PDiag(diag::err_access_dtor_vbase) 2636 << VBase->getType()); 2637 2638 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2639 } 2640} 2641 2642void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2643 if (!CDtorDecl) 2644 return; 2645 2646 if (CXXConstructorDecl *Constructor 2647 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2648 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2649} 2650 2651bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2652 unsigned DiagID, AbstractDiagSelID SelID) { 2653 if (SelID == -1) 2654 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2655 else 2656 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2657} 2658 2659bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2660 const PartialDiagnostic &PD) { 2661 if (!getLangOptions().CPlusPlus) 2662 return false; 2663 2664 if (const ArrayType *AT = Context.getAsArrayType(T)) 2665 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2666 2667 if (const PointerType *PT = T->getAs<PointerType>()) { 2668 // Find the innermost pointer type. 2669 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2670 PT = T; 2671 2672 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2673 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2674 } 2675 2676 const RecordType *RT = T->getAs<RecordType>(); 2677 if (!RT) 2678 return false; 2679 2680 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2681 2682 // We can't answer whether something is abstract until it has a 2683 // definition. If it's currently being defined, we'll walk back 2684 // over all the declarations when we have a full definition. 2685 const CXXRecordDecl *Def = RD->getDefinition(); 2686 if (!Def || Def->isBeingDefined()) 2687 return false; 2688 2689 if (!RD->isAbstract()) 2690 return false; 2691 2692 Diag(Loc, PD) << RD->getDeclName(); 2693 DiagnoseAbstractType(RD); 2694 2695 return true; 2696} 2697 2698void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2699 // Check if we've already emitted the list of pure virtual functions 2700 // for this class. 2701 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2702 return; 2703 2704 CXXFinalOverriderMap FinalOverriders; 2705 RD->getFinalOverriders(FinalOverriders); 2706 2707 // Keep a set of seen pure methods so we won't diagnose the same method 2708 // more than once. 2709 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2710 2711 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2712 MEnd = FinalOverriders.end(); 2713 M != MEnd; 2714 ++M) { 2715 for (OverridingMethods::iterator SO = M->second.begin(), 2716 SOEnd = M->second.end(); 2717 SO != SOEnd; ++SO) { 2718 // C++ [class.abstract]p4: 2719 // A class is abstract if it contains or inherits at least one 2720 // pure virtual function for which the final overrider is pure 2721 // virtual. 2722 2723 // 2724 if (SO->second.size() != 1) 2725 continue; 2726 2727 if (!SO->second.front().Method->isPure()) 2728 continue; 2729 2730 if (!SeenPureMethods.insert(SO->second.front().Method)) 2731 continue; 2732 2733 Diag(SO->second.front().Method->getLocation(), 2734 diag::note_pure_virtual_function) 2735 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2736 } 2737 } 2738 2739 if (!PureVirtualClassDiagSet) 2740 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2741 PureVirtualClassDiagSet->insert(RD); 2742} 2743 2744namespace { 2745struct AbstractUsageInfo { 2746 Sema &S; 2747 CXXRecordDecl *Record; 2748 CanQualType AbstractType; 2749 bool Invalid; 2750 2751 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2752 : S(S), Record(Record), 2753 AbstractType(S.Context.getCanonicalType( 2754 S.Context.getTypeDeclType(Record))), 2755 Invalid(false) {} 2756 2757 void DiagnoseAbstractType() { 2758 if (Invalid) return; 2759 S.DiagnoseAbstractType(Record); 2760 Invalid = true; 2761 } 2762 2763 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2764}; 2765 2766struct CheckAbstractUsage { 2767 AbstractUsageInfo &Info; 2768 const NamedDecl *Ctx; 2769 2770 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2771 : Info(Info), Ctx(Ctx) {} 2772 2773 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2774 switch (TL.getTypeLocClass()) { 2775#define ABSTRACT_TYPELOC(CLASS, PARENT) 2776#define TYPELOC(CLASS, PARENT) \ 2777 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2778#include "clang/AST/TypeLocNodes.def" 2779 } 2780 } 2781 2782 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2783 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2784 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2785 if (!TL.getArg(I)) 2786 continue; 2787 2788 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2789 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2790 } 2791 } 2792 2793 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2794 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2795 } 2796 2797 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2798 // Visit the type parameters from a permissive context. 2799 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2800 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2801 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2802 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2803 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2804 // TODO: other template argument types? 2805 } 2806 } 2807 2808 // Visit pointee types from a permissive context. 2809#define CheckPolymorphic(Type) \ 2810 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2811 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2812 } 2813 CheckPolymorphic(PointerTypeLoc) 2814 CheckPolymorphic(ReferenceTypeLoc) 2815 CheckPolymorphic(MemberPointerTypeLoc) 2816 CheckPolymorphic(BlockPointerTypeLoc) 2817 2818 /// Handle all the types we haven't given a more specific 2819 /// implementation for above. 2820 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2821 // Every other kind of type that we haven't called out already 2822 // that has an inner type is either (1) sugar or (2) contains that 2823 // inner type in some way as a subobject. 2824 if (TypeLoc Next = TL.getNextTypeLoc()) 2825 return Visit(Next, Sel); 2826 2827 // If there's no inner type and we're in a permissive context, 2828 // don't diagnose. 2829 if (Sel == Sema::AbstractNone) return; 2830 2831 // Check whether the type matches the abstract type. 2832 QualType T = TL.getType(); 2833 if (T->isArrayType()) { 2834 Sel = Sema::AbstractArrayType; 2835 T = Info.S.Context.getBaseElementType(T); 2836 } 2837 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2838 if (CT != Info.AbstractType) return; 2839 2840 // It matched; do some magic. 2841 if (Sel == Sema::AbstractArrayType) { 2842 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2843 << T << TL.getSourceRange(); 2844 } else { 2845 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2846 << Sel << T << TL.getSourceRange(); 2847 } 2848 Info.DiagnoseAbstractType(); 2849 } 2850}; 2851 2852void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2853 Sema::AbstractDiagSelID Sel) { 2854 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2855} 2856 2857} 2858 2859/// Check for invalid uses of an abstract type in a method declaration. 2860static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2861 CXXMethodDecl *MD) { 2862 // No need to do the check on definitions, which require that 2863 // the return/param types be complete. 2864 if (MD->doesThisDeclarationHaveABody()) 2865 return; 2866 2867 // For safety's sake, just ignore it if we don't have type source 2868 // information. This should never happen for non-implicit methods, 2869 // but... 2870 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2871 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2872} 2873 2874/// Check for invalid uses of an abstract type within a class definition. 2875static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2876 CXXRecordDecl *RD) { 2877 for (CXXRecordDecl::decl_iterator 2878 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2879 Decl *D = *I; 2880 if (D->isImplicit()) continue; 2881 2882 // Methods and method templates. 2883 if (isa<CXXMethodDecl>(D)) { 2884 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2885 } else if (isa<FunctionTemplateDecl>(D)) { 2886 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2887 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2888 2889 // Fields and static variables. 2890 } else if (isa<FieldDecl>(D)) { 2891 FieldDecl *FD = cast<FieldDecl>(D); 2892 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2893 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2894 } else if (isa<VarDecl>(D)) { 2895 VarDecl *VD = cast<VarDecl>(D); 2896 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2897 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2898 2899 // Nested classes and class templates. 2900 } else if (isa<CXXRecordDecl>(D)) { 2901 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2902 } else if (isa<ClassTemplateDecl>(D)) { 2903 CheckAbstractClassUsage(Info, 2904 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2905 } 2906 } 2907} 2908 2909/// \brief Perform semantic checks on a class definition that has been 2910/// completing, introducing implicitly-declared members, checking for 2911/// abstract types, etc. 2912void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2913 if (!Record) 2914 return; 2915 2916 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2917 AbstractUsageInfo Info(*this, Record); 2918 CheckAbstractClassUsage(Info, Record); 2919 } 2920 2921 // If this is not an aggregate type and has no user-declared constructor, 2922 // complain about any non-static data members of reference or const scalar 2923 // type, since they will never get initializers. 2924 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2925 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2926 bool Complained = false; 2927 for (RecordDecl::field_iterator F = Record->field_begin(), 2928 FEnd = Record->field_end(); 2929 F != FEnd; ++F) { 2930 if (F->getType()->isReferenceType() || 2931 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2932 if (!Complained) { 2933 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2934 << Record->getTagKind() << Record; 2935 Complained = true; 2936 } 2937 2938 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2939 << F->getType()->isReferenceType() 2940 << F->getDeclName(); 2941 } 2942 } 2943 } 2944 2945 if (Record->isDynamicClass() && !Record->isDependentType()) 2946 DynamicClasses.push_back(Record); 2947 2948 if (Record->getIdentifier()) { 2949 // C++ [class.mem]p13: 2950 // If T is the name of a class, then each of the following shall have a 2951 // name different from T: 2952 // - every member of every anonymous union that is a member of class T. 2953 // 2954 // C++ [class.mem]p14: 2955 // In addition, if class T has a user-declared constructor (12.1), every 2956 // non-static data member of class T shall have a name different from T. 2957 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2958 R.first != R.second; ++R.first) { 2959 NamedDecl *D = *R.first; 2960 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2961 isa<IndirectFieldDecl>(D)) { 2962 Diag(D->getLocation(), diag::err_member_name_of_class) 2963 << D->getDeclName(); 2964 break; 2965 } 2966 } 2967 } 2968 2969 // Warn if the class has virtual methods but non-virtual public destructor. 2970 if (Record->isPolymorphic() && !Record->isDependentType()) { 2971 CXXDestructorDecl *dtor = Record->getDestructor(); 2972 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2973 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2974 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2975 } 2976 2977 // See if a method overloads virtual methods in a base 2978 /// class without overriding any. 2979 if (!Record->isDependentType()) { 2980 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2981 MEnd = Record->method_end(); 2982 M != MEnd; ++M) { 2983 if (!(*M)->isStatic()) 2984 DiagnoseHiddenVirtualMethods(Record, *M); 2985 } 2986 } 2987 2988 // Declare inherited constructors. We do this eagerly here because: 2989 // - The standard requires an eager diagnostic for conflicting inherited 2990 // constructors from different classes. 2991 // - The lazy declaration of the other implicit constructors is so as to not 2992 // waste space and performance on classes that are not meant to be 2993 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2994 // have inherited constructors. 2995 DeclareInheritedConstructors(Record); 2996 2997 CheckExplicitlyDefaultedMethods(Record); 2998} 2999 3000void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3001 for (CXXRecordDecl::ctor_iterator CI = Record->ctor_begin(), 3002 CE = Record->ctor_end(); 3003 CI != CE; ++CI) { 3004 if (!CI->isInvalidDecl() && CI->isExplicitlyDefaulted()) { 3005 if (CI->isDefaultConstructor()) { 3006 CheckExplicitlyDefaultedDefaultConstructor(*CI); 3007 } 3008 3009 // FIXME: Do copy and move constructors 3010 } 3011 } 3012 3013 // FIXME: Do copy and move assignment and destructors 3014} 3015 3016void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3017 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3018 3019 // Whether this was the first-declared instance of the constructor. 3020 // This affects whether we implicitly add an exception spec (and, eventually, 3021 // constexpr). It is also ill-formed to explicitly default a constructor such 3022 // that it would be deleted. (C++0x [decl.fct.def.default]) 3023 bool First = CD == CD->getCanonicalDecl(); 3024 3025 if (CD->getNumParams() != 0) { 3026 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3027 << CD->getSourceRange(); 3028 CD->setInvalidDecl(); 3029 return; 3030 } 3031 3032 ImplicitExceptionSpecification Spec 3033 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3034 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3035 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3036 *ExceptionType = Context.getFunctionType( 3037 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3038 3039 if (CtorType->hasExceptionSpec()) { 3040 if (CheckEquivalentExceptionSpec( 3041 PDiag(diag::err_incorrect_defaulted_exception_spec), 3042 PDiag(), 3043 ExceptionType, SourceLocation(), 3044 CtorType, CD->getLocation())) { 3045 CD->setInvalidDecl(); 3046 return; 3047 } 3048 } else if (First) { 3049 // We set the declaration to have the computed exception spec here. 3050 // We know there are no parameters. 3051 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3052 } 3053 3054 if (ShouldDeleteDefaultConstructor(CD)) { 3055 if (First) 3056 CD->setDeletedAsWritten(); 3057 else 3058 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3059 << getSpecialMember(CD); 3060 } 3061} 3062 3063bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3064 CXXRecordDecl *RD = CD->getParent(); 3065 assert(!RD->isDependentType() && "do deletion after instantiation"); 3066 if (!LangOpts.CPlusPlus0x) 3067 return false; 3068 3069 // Do access control from the constructor 3070 ContextRAII CtorContext(*this, CD); 3071 3072 bool Union = RD->isUnion(); 3073 bool AllConst = true; 3074 3075 DiagnosticErrorTrap Trap(Diags); 3076 3077 // We do this because we should never actually use an anonymous 3078 // union's constructor. 3079 if (Union && RD->isAnonymousStructOrUnion()) 3080 return false; 3081 3082 // FIXME: We should put some diagnostic logic right into this function. 3083 3084 // C++0x [class.ctor]/5 3085 // A defaulted default constructor for class X is defined as delete if: 3086 3087 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3088 BE = RD->bases_end(); 3089 BI != BE; ++BI) { 3090 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3091 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3092 3093 // -- any [direct base class] has a type with a destructor that is 3094 // delete or inaccessible from the defaulted default constructor 3095 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3096 if (BaseDtor->isDeleted()) 3097 return true; 3098 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3099 AR_accessible) 3100 return true; 3101 3102 // We'll handle this one later 3103 if (BI->isVirtual()) 3104 continue; 3105 3106 // -- any [direct base class either] has no default constructor or 3107 // overload resolution as applied to [its] default constructor 3108 // results in an ambiguity or in a function that is deleted or 3109 // inaccessible from the defaulted default constructor 3110 InitializedEntity BaseEntity = 3111 InitializedEntity::InitializeBase(Context, BI, 0); 3112 InitializationKind Kind = 3113 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3114 SourceLocation()); 3115 3116 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3117 3118 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3119 return true; 3120 } 3121 3122 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3123 BE = RD->vbases_end(); 3124 BI != BE; ++BI) { 3125 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3126 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3127 3128 // -- any [virtual base class] has a type with a destructor that is 3129 // delete or inaccessible from the defaulted default constructor 3130 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3131 if (BaseDtor->isDeleted()) 3132 return true; 3133 if (CheckDestructorAccess(SourceLocation(), BaseDtor, PDiag()) != 3134 AR_accessible) 3135 return true; 3136 3137 // -- any [virtual base class either] has no default constructor or 3138 // overload resolution as applied to [its] default constructor 3139 // results in an ambiguity or in a function that is deleted or 3140 // inaccessible from the defaulted default constructor 3141 InitializedEntity BaseEntity = 3142 InitializedEntity::InitializeBase(Context, BI, BI); 3143 InitializationKind Kind = 3144 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3145 SourceLocation()); 3146 3147 InitializationSequence InitSeq(*this, BaseEntity, Kind, 0, 0); 3148 3149 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3150 return true; 3151 } 3152 3153 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3154 FE = RD->field_end(); 3155 FI != FE; ++FI) { 3156 QualType FieldType = Context.getBaseElementType(FI->getType()); 3157 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3158 3159 // -- any non-static data member with no brace-or-equal-initializer is of 3160 // reference type 3161 if (FieldType->isReferenceType()) 3162 return true; 3163 3164 // -- X is a union and all its variant members are of const-qualified type 3165 // (or array thereof) 3166 if (Union && !FieldType.isConstQualified()) 3167 AllConst = false; 3168 3169 if (FieldRecord) { 3170 // -- X is a union-like class that has a variant member with a non-trivial 3171 // default constructor 3172 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3173 return true; 3174 3175 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3176 if (FieldDtor->isDeleted()) 3177 return true; 3178 if (CheckDestructorAccess(SourceLocation(), FieldDtor, PDiag()) != 3179 AR_accessible) 3180 return true; 3181 3182 // -- any non-variant non-static data member of const-qualified type (or 3183 // array thereof) with no brace-or-equal-initializer does not have a 3184 // user-provided default constructor 3185 if (FieldType.isConstQualified() && 3186 !FieldRecord->hasUserProvidedDefaultConstructor()) 3187 return true; 3188 3189 if (!Union && FieldRecord->isUnion() && 3190 FieldRecord->isAnonymousStructOrUnion()) { 3191 // We're okay to reuse AllConst here since we only care about the 3192 // value otherwise if we're in a union. 3193 AllConst = true; 3194 3195 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3196 UE = FieldRecord->field_end(); 3197 UI != UE; ++UI) { 3198 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3199 CXXRecordDecl *UnionFieldRecord = 3200 UnionFieldType->getAsCXXRecordDecl(); 3201 3202 if (!UnionFieldType.isConstQualified()) 3203 AllConst = false; 3204 3205 if (UnionFieldRecord && 3206 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3207 return true; 3208 } 3209 3210 if (AllConst) 3211 return true; 3212 3213 // Don't try to initialize the anonymous union 3214 // This is technically non-conformant, but sanity demands it. 3215 continue; 3216 } 3217 } 3218 3219 InitializedEntity MemberEntity = 3220 InitializedEntity::InitializeMember(*FI, 0); 3221 InitializationKind Kind = 3222 InitializationKind::CreateDirect(SourceLocation(), SourceLocation(), 3223 SourceLocation()); 3224 3225 InitializationSequence InitSeq(*this, MemberEntity, Kind, 0, 0); 3226 3227 if (InitSeq.getKind() == InitializationSequence::FailedSequence) 3228 return true; 3229 } 3230 3231 if (Union && AllConst) 3232 return true; 3233 3234 return false; 3235} 3236 3237/// \brief Data used with FindHiddenVirtualMethod 3238namespace { 3239 struct FindHiddenVirtualMethodData { 3240 Sema *S; 3241 CXXMethodDecl *Method; 3242 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3243 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3244 }; 3245} 3246 3247/// \brief Member lookup function that determines whether a given C++ 3248/// method overloads virtual methods in a base class without overriding any, 3249/// to be used with CXXRecordDecl::lookupInBases(). 3250static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3251 CXXBasePath &Path, 3252 void *UserData) { 3253 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3254 3255 FindHiddenVirtualMethodData &Data 3256 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3257 3258 DeclarationName Name = Data.Method->getDeclName(); 3259 assert(Name.getNameKind() == DeclarationName::Identifier); 3260 3261 bool foundSameNameMethod = false; 3262 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3263 for (Path.Decls = BaseRecord->lookup(Name); 3264 Path.Decls.first != Path.Decls.second; 3265 ++Path.Decls.first) { 3266 NamedDecl *D = *Path.Decls.first; 3267 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3268 MD = MD->getCanonicalDecl(); 3269 foundSameNameMethod = true; 3270 // Interested only in hidden virtual methods. 3271 if (!MD->isVirtual()) 3272 continue; 3273 // If the method we are checking overrides a method from its base 3274 // don't warn about the other overloaded methods. 3275 if (!Data.S->IsOverload(Data.Method, MD, false)) 3276 return true; 3277 // Collect the overload only if its hidden. 3278 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3279 overloadedMethods.push_back(MD); 3280 } 3281 } 3282 3283 if (foundSameNameMethod) 3284 Data.OverloadedMethods.append(overloadedMethods.begin(), 3285 overloadedMethods.end()); 3286 return foundSameNameMethod; 3287} 3288 3289/// \brief See if a method overloads virtual methods in a base class without 3290/// overriding any. 3291void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3292 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 3293 MD->getLocation()) == Diagnostic::Ignored) 3294 return; 3295 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 3296 return; 3297 3298 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3299 /*bool RecordPaths=*/false, 3300 /*bool DetectVirtual=*/false); 3301 FindHiddenVirtualMethodData Data; 3302 Data.Method = MD; 3303 Data.S = this; 3304 3305 // Keep the base methods that were overriden or introduced in the subclass 3306 // by 'using' in a set. A base method not in this set is hidden. 3307 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3308 res.first != res.second; ++res.first) { 3309 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3310 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3311 E = MD->end_overridden_methods(); 3312 I != E; ++I) 3313 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3314 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3315 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3316 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3317 } 3318 3319 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3320 !Data.OverloadedMethods.empty()) { 3321 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3322 << MD << (Data.OverloadedMethods.size() > 1); 3323 3324 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3325 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3326 Diag(overloadedMD->getLocation(), 3327 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3328 } 3329 } 3330} 3331 3332void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3333 Decl *TagDecl, 3334 SourceLocation LBrac, 3335 SourceLocation RBrac, 3336 AttributeList *AttrList) { 3337 if (!TagDecl) 3338 return; 3339 3340 AdjustDeclIfTemplate(TagDecl); 3341 3342 ActOnFields(S, RLoc, TagDecl, 3343 // strict aliasing violation! 3344 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3345 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3346 3347 CheckCompletedCXXClass( 3348 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3349} 3350 3351/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3352/// special functions, such as the default constructor, copy 3353/// constructor, or destructor, to the given C++ class (C++ 3354/// [special]p1). This routine can only be executed just before the 3355/// definition of the class is complete. 3356void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3357 if (!ClassDecl->hasUserDeclaredConstructor()) 3358 ++ASTContext::NumImplicitDefaultConstructors; 3359 3360 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3361 ++ASTContext::NumImplicitCopyConstructors; 3362 3363 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3364 ++ASTContext::NumImplicitCopyAssignmentOperators; 3365 3366 // If we have a dynamic class, then the copy assignment operator may be 3367 // virtual, so we have to declare it immediately. This ensures that, e.g., 3368 // it shows up in the right place in the vtable and that we diagnose 3369 // problems with the implicit exception specification. 3370 if (ClassDecl->isDynamicClass()) 3371 DeclareImplicitCopyAssignment(ClassDecl); 3372 } 3373 3374 if (!ClassDecl->hasUserDeclaredDestructor()) { 3375 ++ASTContext::NumImplicitDestructors; 3376 3377 // If we have a dynamic class, then the destructor may be virtual, so we 3378 // have to declare the destructor immediately. This ensures that, e.g., it 3379 // shows up in the right place in the vtable and that we diagnose problems 3380 // with the implicit exception specification. 3381 if (ClassDecl->isDynamicClass()) 3382 DeclareImplicitDestructor(ClassDecl); 3383 } 3384} 3385 3386void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3387 if (!D) 3388 return; 3389 3390 int NumParamList = D->getNumTemplateParameterLists(); 3391 for (int i = 0; i < NumParamList; i++) { 3392 TemplateParameterList* Params = D->getTemplateParameterList(i); 3393 for (TemplateParameterList::iterator Param = Params->begin(), 3394 ParamEnd = Params->end(); 3395 Param != ParamEnd; ++Param) { 3396 NamedDecl *Named = cast<NamedDecl>(*Param); 3397 if (Named->getDeclName()) { 3398 S->AddDecl(Named); 3399 IdResolver.AddDecl(Named); 3400 } 3401 } 3402 } 3403} 3404 3405void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3406 if (!D) 3407 return; 3408 3409 TemplateParameterList *Params = 0; 3410 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3411 Params = Template->getTemplateParameters(); 3412 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3413 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3414 Params = PartialSpec->getTemplateParameters(); 3415 else 3416 return; 3417 3418 for (TemplateParameterList::iterator Param = Params->begin(), 3419 ParamEnd = Params->end(); 3420 Param != ParamEnd; ++Param) { 3421 NamedDecl *Named = cast<NamedDecl>(*Param); 3422 if (Named->getDeclName()) { 3423 S->AddDecl(Named); 3424 IdResolver.AddDecl(Named); 3425 } 3426 } 3427} 3428 3429void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3430 if (!RecordD) return; 3431 AdjustDeclIfTemplate(RecordD); 3432 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3433 PushDeclContext(S, Record); 3434} 3435 3436void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3437 if (!RecordD) return; 3438 PopDeclContext(); 3439} 3440 3441/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3442/// parsing a top-level (non-nested) C++ class, and we are now 3443/// parsing those parts of the given Method declaration that could 3444/// not be parsed earlier (C++ [class.mem]p2), such as default 3445/// arguments. This action should enter the scope of the given 3446/// Method declaration as if we had just parsed the qualified method 3447/// name. However, it should not bring the parameters into scope; 3448/// that will be performed by ActOnDelayedCXXMethodParameter. 3449void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3450} 3451 3452/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3453/// C++ method declaration. We're (re-)introducing the given 3454/// function parameter into scope for use in parsing later parts of 3455/// the method declaration. For example, we could see an 3456/// ActOnParamDefaultArgument event for this parameter. 3457void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3458 if (!ParamD) 3459 return; 3460 3461 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3462 3463 // If this parameter has an unparsed default argument, clear it out 3464 // to make way for the parsed default argument. 3465 if (Param->hasUnparsedDefaultArg()) 3466 Param->setDefaultArg(0); 3467 3468 S->AddDecl(Param); 3469 if (Param->getDeclName()) 3470 IdResolver.AddDecl(Param); 3471} 3472 3473/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3474/// processing the delayed method declaration for Method. The method 3475/// declaration is now considered finished. There may be a separate 3476/// ActOnStartOfFunctionDef action later (not necessarily 3477/// immediately!) for this method, if it was also defined inside the 3478/// class body. 3479void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3480 if (!MethodD) 3481 return; 3482 3483 AdjustDeclIfTemplate(MethodD); 3484 3485 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3486 3487 // Now that we have our default arguments, check the constructor 3488 // again. It could produce additional diagnostics or affect whether 3489 // the class has implicitly-declared destructors, among other 3490 // things. 3491 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3492 CheckConstructor(Constructor); 3493 3494 // Check the default arguments, which we may have added. 3495 if (!Method->isInvalidDecl()) 3496 CheckCXXDefaultArguments(Method); 3497} 3498 3499/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3500/// the well-formedness of the constructor declarator @p D with type @p 3501/// R. If there are any errors in the declarator, this routine will 3502/// emit diagnostics and set the invalid bit to true. In any case, the type 3503/// will be updated to reflect a well-formed type for the constructor and 3504/// returned. 3505QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3506 StorageClass &SC) { 3507 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3508 3509 // C++ [class.ctor]p3: 3510 // A constructor shall not be virtual (10.3) or static (9.4). A 3511 // constructor can be invoked for a const, volatile or const 3512 // volatile object. A constructor shall not be declared const, 3513 // volatile, or const volatile (9.3.2). 3514 if (isVirtual) { 3515 if (!D.isInvalidType()) 3516 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3517 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3518 << SourceRange(D.getIdentifierLoc()); 3519 D.setInvalidType(); 3520 } 3521 if (SC == SC_Static) { 3522 if (!D.isInvalidType()) 3523 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3524 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3525 << SourceRange(D.getIdentifierLoc()); 3526 D.setInvalidType(); 3527 SC = SC_None; 3528 } 3529 3530 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3531 if (FTI.TypeQuals != 0) { 3532 if (FTI.TypeQuals & Qualifiers::Const) 3533 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3534 << "const" << SourceRange(D.getIdentifierLoc()); 3535 if (FTI.TypeQuals & Qualifiers::Volatile) 3536 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3537 << "volatile" << SourceRange(D.getIdentifierLoc()); 3538 if (FTI.TypeQuals & Qualifiers::Restrict) 3539 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3540 << "restrict" << SourceRange(D.getIdentifierLoc()); 3541 D.setInvalidType(); 3542 } 3543 3544 // C++0x [class.ctor]p4: 3545 // A constructor shall not be declared with a ref-qualifier. 3546 if (FTI.hasRefQualifier()) { 3547 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3548 << FTI.RefQualifierIsLValueRef 3549 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3550 D.setInvalidType(); 3551 } 3552 3553 // Rebuild the function type "R" without any type qualifiers (in 3554 // case any of the errors above fired) and with "void" as the 3555 // return type, since constructors don't have return types. 3556 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3557 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3558 return R; 3559 3560 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3561 EPI.TypeQuals = 0; 3562 EPI.RefQualifier = RQ_None; 3563 3564 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3565 Proto->getNumArgs(), EPI); 3566} 3567 3568/// CheckConstructor - Checks a fully-formed constructor for 3569/// well-formedness, issuing any diagnostics required. Returns true if 3570/// the constructor declarator is invalid. 3571void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3572 CXXRecordDecl *ClassDecl 3573 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3574 if (!ClassDecl) 3575 return Constructor->setInvalidDecl(); 3576 3577 // C++ [class.copy]p3: 3578 // A declaration of a constructor for a class X is ill-formed if 3579 // its first parameter is of type (optionally cv-qualified) X and 3580 // either there are no other parameters or else all other 3581 // parameters have default arguments. 3582 if (!Constructor->isInvalidDecl() && 3583 ((Constructor->getNumParams() == 1) || 3584 (Constructor->getNumParams() > 1 && 3585 Constructor->getParamDecl(1)->hasDefaultArg())) && 3586 Constructor->getTemplateSpecializationKind() 3587 != TSK_ImplicitInstantiation) { 3588 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3589 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3590 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3591 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3592 const char *ConstRef 3593 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3594 : " const &"; 3595 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3596 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3597 3598 // FIXME: Rather that making the constructor invalid, we should endeavor 3599 // to fix the type. 3600 Constructor->setInvalidDecl(); 3601 } 3602 } 3603} 3604 3605/// CheckDestructor - Checks a fully-formed destructor definition for 3606/// well-formedness, issuing any diagnostics required. Returns true 3607/// on error. 3608bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3609 CXXRecordDecl *RD = Destructor->getParent(); 3610 3611 if (Destructor->isVirtual()) { 3612 SourceLocation Loc; 3613 3614 if (!Destructor->isImplicit()) 3615 Loc = Destructor->getLocation(); 3616 else 3617 Loc = RD->getLocation(); 3618 3619 // If we have a virtual destructor, look up the deallocation function 3620 FunctionDecl *OperatorDelete = 0; 3621 DeclarationName Name = 3622 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3623 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3624 return true; 3625 3626 MarkDeclarationReferenced(Loc, OperatorDelete); 3627 3628 Destructor->setOperatorDelete(OperatorDelete); 3629 } 3630 3631 return false; 3632} 3633 3634static inline bool 3635FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3636 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3637 FTI.ArgInfo[0].Param && 3638 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3639} 3640 3641/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3642/// the well-formednes of the destructor declarator @p D with type @p 3643/// R. If there are any errors in the declarator, this routine will 3644/// emit diagnostics and set the declarator to invalid. Even if this happens, 3645/// will be updated to reflect a well-formed type for the destructor and 3646/// returned. 3647QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3648 StorageClass& SC) { 3649 // C++ [class.dtor]p1: 3650 // [...] A typedef-name that names a class is a class-name 3651 // (7.1.3); however, a typedef-name that names a class shall not 3652 // be used as the identifier in the declarator for a destructor 3653 // declaration. 3654 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3655 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3656 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3657 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3658 else if (const TemplateSpecializationType *TST = 3659 DeclaratorType->getAs<TemplateSpecializationType>()) 3660 if (TST->isTypeAlias()) 3661 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3662 << DeclaratorType << 1; 3663 3664 // C++ [class.dtor]p2: 3665 // A destructor is used to destroy objects of its class type. A 3666 // destructor takes no parameters, and no return type can be 3667 // specified for it (not even void). The address of a destructor 3668 // shall not be taken. A destructor shall not be static. A 3669 // destructor can be invoked for a const, volatile or const 3670 // volatile object. A destructor shall not be declared const, 3671 // volatile or const volatile (9.3.2). 3672 if (SC == SC_Static) { 3673 if (!D.isInvalidType()) 3674 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3675 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3676 << SourceRange(D.getIdentifierLoc()) 3677 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3678 3679 SC = SC_None; 3680 } 3681 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3682 // Destructors don't have return types, but the parser will 3683 // happily parse something like: 3684 // 3685 // class X { 3686 // float ~X(); 3687 // }; 3688 // 3689 // The return type will be eliminated later. 3690 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3691 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3692 << SourceRange(D.getIdentifierLoc()); 3693 } 3694 3695 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3696 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3697 if (FTI.TypeQuals & Qualifiers::Const) 3698 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3699 << "const" << SourceRange(D.getIdentifierLoc()); 3700 if (FTI.TypeQuals & Qualifiers::Volatile) 3701 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3702 << "volatile" << SourceRange(D.getIdentifierLoc()); 3703 if (FTI.TypeQuals & Qualifiers::Restrict) 3704 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3705 << "restrict" << SourceRange(D.getIdentifierLoc()); 3706 D.setInvalidType(); 3707 } 3708 3709 // C++0x [class.dtor]p2: 3710 // A destructor shall not be declared with a ref-qualifier. 3711 if (FTI.hasRefQualifier()) { 3712 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3713 << FTI.RefQualifierIsLValueRef 3714 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3715 D.setInvalidType(); 3716 } 3717 3718 // Make sure we don't have any parameters. 3719 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3720 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3721 3722 // Delete the parameters. 3723 FTI.freeArgs(); 3724 D.setInvalidType(); 3725 } 3726 3727 // Make sure the destructor isn't variadic. 3728 if (FTI.isVariadic) { 3729 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3730 D.setInvalidType(); 3731 } 3732 3733 // Rebuild the function type "R" without any type qualifiers or 3734 // parameters (in case any of the errors above fired) and with 3735 // "void" as the return type, since destructors don't have return 3736 // types. 3737 if (!D.isInvalidType()) 3738 return R; 3739 3740 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3741 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3742 EPI.Variadic = false; 3743 EPI.TypeQuals = 0; 3744 EPI.RefQualifier = RQ_None; 3745 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3746} 3747 3748/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3749/// well-formednes of the conversion function declarator @p D with 3750/// type @p R. If there are any errors in the declarator, this routine 3751/// will emit diagnostics and return true. Otherwise, it will return 3752/// false. Either way, the type @p R will be updated to reflect a 3753/// well-formed type for the conversion operator. 3754void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3755 StorageClass& SC) { 3756 // C++ [class.conv.fct]p1: 3757 // Neither parameter types nor return type can be specified. The 3758 // type of a conversion function (8.3.5) is "function taking no 3759 // parameter returning conversion-type-id." 3760 if (SC == SC_Static) { 3761 if (!D.isInvalidType()) 3762 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3763 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3764 << SourceRange(D.getIdentifierLoc()); 3765 D.setInvalidType(); 3766 SC = SC_None; 3767 } 3768 3769 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3770 3771 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3772 // Conversion functions don't have return types, but the parser will 3773 // happily parse something like: 3774 // 3775 // class X { 3776 // float operator bool(); 3777 // }; 3778 // 3779 // The return type will be changed later anyway. 3780 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3781 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3782 << SourceRange(D.getIdentifierLoc()); 3783 D.setInvalidType(); 3784 } 3785 3786 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3787 3788 // Make sure we don't have any parameters. 3789 if (Proto->getNumArgs() > 0) { 3790 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3791 3792 // Delete the parameters. 3793 D.getFunctionTypeInfo().freeArgs(); 3794 D.setInvalidType(); 3795 } else if (Proto->isVariadic()) { 3796 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3797 D.setInvalidType(); 3798 } 3799 3800 // Diagnose "&operator bool()" and other such nonsense. This 3801 // is actually a gcc extension which we don't support. 3802 if (Proto->getResultType() != ConvType) { 3803 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3804 << Proto->getResultType(); 3805 D.setInvalidType(); 3806 ConvType = Proto->getResultType(); 3807 } 3808 3809 // C++ [class.conv.fct]p4: 3810 // The conversion-type-id shall not represent a function type nor 3811 // an array type. 3812 if (ConvType->isArrayType()) { 3813 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3814 ConvType = Context.getPointerType(ConvType); 3815 D.setInvalidType(); 3816 } else if (ConvType->isFunctionType()) { 3817 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3818 ConvType = Context.getPointerType(ConvType); 3819 D.setInvalidType(); 3820 } 3821 3822 // Rebuild the function type "R" without any parameters (in case any 3823 // of the errors above fired) and with the conversion type as the 3824 // return type. 3825 if (D.isInvalidType()) 3826 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3827 3828 // C++0x explicit conversion operators. 3829 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3830 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3831 diag::warn_explicit_conversion_functions) 3832 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3833} 3834 3835/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3836/// the declaration of the given C++ conversion function. This routine 3837/// is responsible for recording the conversion function in the C++ 3838/// class, if possible. 3839Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3840 assert(Conversion && "Expected to receive a conversion function declaration"); 3841 3842 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3843 3844 // Make sure we aren't redeclaring the conversion function. 3845 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3846 3847 // C++ [class.conv.fct]p1: 3848 // [...] A conversion function is never used to convert a 3849 // (possibly cv-qualified) object to the (possibly cv-qualified) 3850 // same object type (or a reference to it), to a (possibly 3851 // cv-qualified) base class of that type (or a reference to it), 3852 // or to (possibly cv-qualified) void. 3853 // FIXME: Suppress this warning if the conversion function ends up being a 3854 // virtual function that overrides a virtual function in a base class. 3855 QualType ClassType 3856 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3857 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3858 ConvType = ConvTypeRef->getPointeeType(); 3859 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3860 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3861 /* Suppress diagnostics for instantiations. */; 3862 else if (ConvType->isRecordType()) { 3863 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3864 if (ConvType == ClassType) 3865 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3866 << ClassType; 3867 else if (IsDerivedFrom(ClassType, ConvType)) 3868 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3869 << ClassType << ConvType; 3870 } else if (ConvType->isVoidType()) { 3871 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3872 << ClassType << ConvType; 3873 } 3874 3875 if (FunctionTemplateDecl *ConversionTemplate 3876 = Conversion->getDescribedFunctionTemplate()) 3877 return ConversionTemplate; 3878 3879 return Conversion; 3880} 3881 3882//===----------------------------------------------------------------------===// 3883// Namespace Handling 3884//===----------------------------------------------------------------------===// 3885 3886 3887 3888/// ActOnStartNamespaceDef - This is called at the start of a namespace 3889/// definition. 3890Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3891 SourceLocation InlineLoc, 3892 SourceLocation NamespaceLoc, 3893 SourceLocation IdentLoc, 3894 IdentifierInfo *II, 3895 SourceLocation LBrace, 3896 AttributeList *AttrList) { 3897 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3898 // For anonymous namespace, take the location of the left brace. 3899 SourceLocation Loc = II ? IdentLoc : LBrace; 3900 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3901 StartLoc, Loc, II); 3902 Namespc->setInline(InlineLoc.isValid()); 3903 3904 Scope *DeclRegionScope = NamespcScope->getParent(); 3905 3906 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3907 3908 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3909 PushNamespaceVisibilityAttr(Attr); 3910 3911 if (II) { 3912 // C++ [namespace.def]p2: 3913 // The identifier in an original-namespace-definition shall not 3914 // have been previously defined in the declarative region in 3915 // which the original-namespace-definition appears. The 3916 // identifier in an original-namespace-definition is the name of 3917 // the namespace. Subsequently in that declarative region, it is 3918 // treated as an original-namespace-name. 3919 // 3920 // Since namespace names are unique in their scope, and we don't 3921 // look through using directives, just look for any ordinary names. 3922 3923 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 3924 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 3925 Decl::IDNS_Namespace; 3926 NamedDecl *PrevDecl = 0; 3927 for (DeclContext::lookup_result R 3928 = CurContext->getRedeclContext()->lookup(II); 3929 R.first != R.second; ++R.first) { 3930 if ((*R.first)->getIdentifierNamespace() & IDNS) { 3931 PrevDecl = *R.first; 3932 break; 3933 } 3934 } 3935 3936 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3937 // This is an extended namespace definition. 3938 if (Namespc->isInline() != OrigNS->isInline()) { 3939 // inline-ness must match 3940 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3941 << Namespc->isInline(); 3942 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3943 Namespc->setInvalidDecl(); 3944 // Recover by ignoring the new namespace's inline status. 3945 Namespc->setInline(OrigNS->isInline()); 3946 } 3947 3948 // Attach this namespace decl to the chain of extended namespace 3949 // definitions. 3950 OrigNS->setNextNamespace(Namespc); 3951 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3952 3953 // Remove the previous declaration from the scope. 3954 if (DeclRegionScope->isDeclScope(OrigNS)) { 3955 IdResolver.RemoveDecl(OrigNS); 3956 DeclRegionScope->RemoveDecl(OrigNS); 3957 } 3958 } else if (PrevDecl) { 3959 // This is an invalid name redefinition. 3960 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3961 << Namespc->getDeclName(); 3962 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3963 Namespc->setInvalidDecl(); 3964 // Continue on to push Namespc as current DeclContext and return it. 3965 } else if (II->isStr("std") && 3966 CurContext->getRedeclContext()->isTranslationUnit()) { 3967 // This is the first "real" definition of the namespace "std", so update 3968 // our cache of the "std" namespace to point at this definition. 3969 if (NamespaceDecl *StdNS = getStdNamespace()) { 3970 // We had already defined a dummy namespace "std". Link this new 3971 // namespace definition to the dummy namespace "std". 3972 StdNS->setNextNamespace(Namespc); 3973 StdNS->setLocation(IdentLoc); 3974 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3975 } 3976 3977 // Make our StdNamespace cache point at the first real definition of the 3978 // "std" namespace. 3979 StdNamespace = Namespc; 3980 } 3981 3982 PushOnScopeChains(Namespc, DeclRegionScope); 3983 } else { 3984 // Anonymous namespaces. 3985 assert(Namespc->isAnonymousNamespace()); 3986 3987 // Link the anonymous namespace into its parent. 3988 NamespaceDecl *PrevDecl; 3989 DeclContext *Parent = CurContext->getRedeclContext(); 3990 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3991 PrevDecl = TU->getAnonymousNamespace(); 3992 TU->setAnonymousNamespace(Namespc); 3993 } else { 3994 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3995 PrevDecl = ND->getAnonymousNamespace(); 3996 ND->setAnonymousNamespace(Namespc); 3997 } 3998 3999 // Link the anonymous namespace with its previous declaration. 4000 if (PrevDecl) { 4001 assert(PrevDecl->isAnonymousNamespace()); 4002 assert(!PrevDecl->getNextNamespace()); 4003 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4004 PrevDecl->setNextNamespace(Namespc); 4005 4006 if (Namespc->isInline() != PrevDecl->isInline()) { 4007 // inline-ness must match 4008 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4009 << Namespc->isInline(); 4010 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4011 Namespc->setInvalidDecl(); 4012 // Recover by ignoring the new namespace's inline status. 4013 Namespc->setInline(PrevDecl->isInline()); 4014 } 4015 } 4016 4017 CurContext->addDecl(Namespc); 4018 4019 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4020 // behaves as if it were replaced by 4021 // namespace unique { /* empty body */ } 4022 // using namespace unique; 4023 // namespace unique { namespace-body } 4024 // where all occurrences of 'unique' in a translation unit are 4025 // replaced by the same identifier and this identifier differs 4026 // from all other identifiers in the entire program. 4027 4028 // We just create the namespace with an empty name and then add an 4029 // implicit using declaration, just like the standard suggests. 4030 // 4031 // CodeGen enforces the "universally unique" aspect by giving all 4032 // declarations semantically contained within an anonymous 4033 // namespace internal linkage. 4034 4035 if (!PrevDecl) { 4036 UsingDirectiveDecl* UD 4037 = UsingDirectiveDecl::Create(Context, CurContext, 4038 /* 'using' */ LBrace, 4039 /* 'namespace' */ SourceLocation(), 4040 /* qualifier */ NestedNameSpecifierLoc(), 4041 /* identifier */ SourceLocation(), 4042 Namespc, 4043 /* Ancestor */ CurContext); 4044 UD->setImplicit(); 4045 CurContext->addDecl(UD); 4046 } 4047 } 4048 4049 // Although we could have an invalid decl (i.e. the namespace name is a 4050 // redefinition), push it as current DeclContext and try to continue parsing. 4051 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4052 // for the namespace has the declarations that showed up in that particular 4053 // namespace definition. 4054 PushDeclContext(NamespcScope, Namespc); 4055 return Namespc; 4056} 4057 4058/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4059/// is a namespace alias, returns the namespace it points to. 4060static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4061 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4062 return AD->getNamespace(); 4063 return dyn_cast_or_null<NamespaceDecl>(D); 4064} 4065 4066/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4067/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4068void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4069 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4070 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4071 Namespc->setRBraceLoc(RBrace); 4072 PopDeclContext(); 4073 if (Namespc->hasAttr<VisibilityAttr>()) 4074 PopPragmaVisibility(); 4075} 4076 4077CXXRecordDecl *Sema::getStdBadAlloc() const { 4078 return cast_or_null<CXXRecordDecl>( 4079 StdBadAlloc.get(Context.getExternalSource())); 4080} 4081 4082NamespaceDecl *Sema::getStdNamespace() const { 4083 return cast_or_null<NamespaceDecl>( 4084 StdNamespace.get(Context.getExternalSource())); 4085} 4086 4087/// \brief Retrieve the special "std" namespace, which may require us to 4088/// implicitly define the namespace. 4089NamespaceDecl *Sema::getOrCreateStdNamespace() { 4090 if (!StdNamespace) { 4091 // The "std" namespace has not yet been defined, so build one implicitly. 4092 StdNamespace = NamespaceDecl::Create(Context, 4093 Context.getTranslationUnitDecl(), 4094 SourceLocation(), SourceLocation(), 4095 &PP.getIdentifierTable().get("std")); 4096 getStdNamespace()->setImplicit(true); 4097 } 4098 4099 return getStdNamespace(); 4100} 4101 4102/// \brief Determine whether a using statement is in a context where it will be 4103/// apply in all contexts. 4104static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4105 switch (CurContext->getDeclKind()) { 4106 case Decl::TranslationUnit: 4107 return true; 4108 case Decl::LinkageSpec: 4109 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4110 default: 4111 return false; 4112 } 4113} 4114 4115Decl *Sema::ActOnUsingDirective(Scope *S, 4116 SourceLocation UsingLoc, 4117 SourceLocation NamespcLoc, 4118 CXXScopeSpec &SS, 4119 SourceLocation IdentLoc, 4120 IdentifierInfo *NamespcName, 4121 AttributeList *AttrList) { 4122 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4123 assert(NamespcName && "Invalid NamespcName."); 4124 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4125 4126 // This can only happen along a recovery path. 4127 while (S->getFlags() & Scope::TemplateParamScope) 4128 S = S->getParent(); 4129 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4130 4131 UsingDirectiveDecl *UDir = 0; 4132 NestedNameSpecifier *Qualifier = 0; 4133 if (SS.isSet()) 4134 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4135 4136 // Lookup namespace name. 4137 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4138 LookupParsedName(R, S, &SS); 4139 if (R.isAmbiguous()) 4140 return 0; 4141 4142 if (R.empty()) { 4143 // Allow "using namespace std;" or "using namespace ::std;" even if 4144 // "std" hasn't been defined yet, for GCC compatibility. 4145 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4146 NamespcName->isStr("std")) { 4147 Diag(IdentLoc, diag::ext_using_undefined_std); 4148 R.addDecl(getOrCreateStdNamespace()); 4149 R.resolveKind(); 4150 } 4151 // Otherwise, attempt typo correction. 4152 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4153 CTC_NoKeywords, 0)) { 4154 if (R.getAsSingle<NamespaceDecl>() || 4155 R.getAsSingle<NamespaceAliasDecl>()) { 4156 if (DeclContext *DC = computeDeclContext(SS, false)) 4157 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4158 << NamespcName << DC << Corrected << SS.getRange() 4159 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4160 else 4161 Diag(IdentLoc, diag::err_using_directive_suggest) 4162 << NamespcName << Corrected 4163 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4164 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4165 << Corrected; 4166 4167 NamespcName = Corrected.getAsIdentifierInfo(); 4168 } else { 4169 R.clear(); 4170 R.setLookupName(NamespcName); 4171 } 4172 } 4173 } 4174 4175 if (!R.empty()) { 4176 NamedDecl *Named = R.getFoundDecl(); 4177 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4178 && "expected namespace decl"); 4179 // C++ [namespace.udir]p1: 4180 // A using-directive specifies that the names in the nominated 4181 // namespace can be used in the scope in which the 4182 // using-directive appears after the using-directive. During 4183 // unqualified name lookup (3.4.1), the names appear as if they 4184 // were declared in the nearest enclosing namespace which 4185 // contains both the using-directive and the nominated 4186 // namespace. [Note: in this context, "contains" means "contains 4187 // directly or indirectly". ] 4188 4189 // Find enclosing context containing both using-directive and 4190 // nominated namespace. 4191 NamespaceDecl *NS = getNamespaceDecl(Named); 4192 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4193 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4194 CommonAncestor = CommonAncestor->getParent(); 4195 4196 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4197 SS.getWithLocInContext(Context), 4198 IdentLoc, Named, CommonAncestor); 4199 4200 if (IsUsingDirectiveInToplevelContext(CurContext) && 4201 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4202 Diag(IdentLoc, diag::warn_using_directive_in_header); 4203 } 4204 4205 PushUsingDirective(S, UDir); 4206 } else { 4207 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4208 } 4209 4210 // FIXME: We ignore attributes for now. 4211 return UDir; 4212} 4213 4214void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4215 // If scope has associated entity, then using directive is at namespace 4216 // or translation unit scope. We add UsingDirectiveDecls, into 4217 // it's lookup structure. 4218 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4219 Ctx->addDecl(UDir); 4220 else 4221 // Otherwise it is block-sope. using-directives will affect lookup 4222 // only to the end of scope. 4223 S->PushUsingDirective(UDir); 4224} 4225 4226 4227Decl *Sema::ActOnUsingDeclaration(Scope *S, 4228 AccessSpecifier AS, 4229 bool HasUsingKeyword, 4230 SourceLocation UsingLoc, 4231 CXXScopeSpec &SS, 4232 UnqualifiedId &Name, 4233 AttributeList *AttrList, 4234 bool IsTypeName, 4235 SourceLocation TypenameLoc) { 4236 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4237 4238 switch (Name.getKind()) { 4239 case UnqualifiedId::IK_Identifier: 4240 case UnqualifiedId::IK_OperatorFunctionId: 4241 case UnqualifiedId::IK_LiteralOperatorId: 4242 case UnqualifiedId::IK_ConversionFunctionId: 4243 break; 4244 4245 case UnqualifiedId::IK_ConstructorName: 4246 case UnqualifiedId::IK_ConstructorTemplateId: 4247 // C++0x inherited constructors. 4248 if (getLangOptions().CPlusPlus0x) break; 4249 4250 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4251 << SS.getRange(); 4252 return 0; 4253 4254 case UnqualifiedId::IK_DestructorName: 4255 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4256 << SS.getRange(); 4257 return 0; 4258 4259 case UnqualifiedId::IK_TemplateId: 4260 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4261 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4262 return 0; 4263 } 4264 4265 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4266 DeclarationName TargetName = TargetNameInfo.getName(); 4267 if (!TargetName) 4268 return 0; 4269 4270 // Warn about using declarations. 4271 // TODO: store that the declaration was written without 'using' and 4272 // talk about access decls instead of using decls in the 4273 // diagnostics. 4274 if (!HasUsingKeyword) { 4275 UsingLoc = Name.getSourceRange().getBegin(); 4276 4277 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4278 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4279 } 4280 4281 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4282 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4283 return 0; 4284 4285 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4286 TargetNameInfo, AttrList, 4287 /* IsInstantiation */ false, 4288 IsTypeName, TypenameLoc); 4289 if (UD) 4290 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4291 4292 return UD; 4293} 4294 4295/// \brief Determine whether a using declaration considers the given 4296/// declarations as "equivalent", e.g., if they are redeclarations of 4297/// the same entity or are both typedefs of the same type. 4298static bool 4299IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4300 bool &SuppressRedeclaration) { 4301 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4302 SuppressRedeclaration = false; 4303 return true; 4304 } 4305 4306 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4307 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4308 SuppressRedeclaration = true; 4309 return Context.hasSameType(TD1->getUnderlyingType(), 4310 TD2->getUnderlyingType()); 4311 } 4312 4313 return false; 4314} 4315 4316 4317/// Determines whether to create a using shadow decl for a particular 4318/// decl, given the set of decls existing prior to this using lookup. 4319bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4320 const LookupResult &Previous) { 4321 // Diagnose finding a decl which is not from a base class of the 4322 // current class. We do this now because there are cases where this 4323 // function will silently decide not to build a shadow decl, which 4324 // will pre-empt further diagnostics. 4325 // 4326 // We don't need to do this in C++0x because we do the check once on 4327 // the qualifier. 4328 // 4329 // FIXME: diagnose the following if we care enough: 4330 // struct A { int foo; }; 4331 // struct B : A { using A::foo; }; 4332 // template <class T> struct C : A {}; 4333 // template <class T> struct D : C<T> { using B::foo; } // <--- 4334 // This is invalid (during instantiation) in C++03 because B::foo 4335 // resolves to the using decl in B, which is not a base class of D<T>. 4336 // We can't diagnose it immediately because C<T> is an unknown 4337 // specialization. The UsingShadowDecl in D<T> then points directly 4338 // to A::foo, which will look well-formed when we instantiate. 4339 // The right solution is to not collapse the shadow-decl chain. 4340 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4341 DeclContext *OrigDC = Orig->getDeclContext(); 4342 4343 // Handle enums and anonymous structs. 4344 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4345 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4346 while (OrigRec->isAnonymousStructOrUnion()) 4347 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4348 4349 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4350 if (OrigDC == CurContext) { 4351 Diag(Using->getLocation(), 4352 diag::err_using_decl_nested_name_specifier_is_current_class) 4353 << Using->getQualifierLoc().getSourceRange(); 4354 Diag(Orig->getLocation(), diag::note_using_decl_target); 4355 return true; 4356 } 4357 4358 Diag(Using->getQualifierLoc().getBeginLoc(), 4359 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4360 << Using->getQualifier() 4361 << cast<CXXRecordDecl>(CurContext) 4362 << Using->getQualifierLoc().getSourceRange(); 4363 Diag(Orig->getLocation(), diag::note_using_decl_target); 4364 return true; 4365 } 4366 } 4367 4368 if (Previous.empty()) return false; 4369 4370 NamedDecl *Target = Orig; 4371 if (isa<UsingShadowDecl>(Target)) 4372 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4373 4374 // If the target happens to be one of the previous declarations, we 4375 // don't have a conflict. 4376 // 4377 // FIXME: but we might be increasing its access, in which case we 4378 // should redeclare it. 4379 NamedDecl *NonTag = 0, *Tag = 0; 4380 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4381 I != E; ++I) { 4382 NamedDecl *D = (*I)->getUnderlyingDecl(); 4383 bool Result; 4384 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4385 return Result; 4386 4387 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4388 } 4389 4390 if (Target->isFunctionOrFunctionTemplate()) { 4391 FunctionDecl *FD; 4392 if (isa<FunctionTemplateDecl>(Target)) 4393 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4394 else 4395 FD = cast<FunctionDecl>(Target); 4396 4397 NamedDecl *OldDecl = 0; 4398 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4399 case Ovl_Overload: 4400 return false; 4401 4402 case Ovl_NonFunction: 4403 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4404 break; 4405 4406 // We found a decl with the exact signature. 4407 case Ovl_Match: 4408 // If we're in a record, we want to hide the target, so we 4409 // return true (without a diagnostic) to tell the caller not to 4410 // build a shadow decl. 4411 if (CurContext->isRecord()) 4412 return true; 4413 4414 // If we're not in a record, this is an error. 4415 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4416 break; 4417 } 4418 4419 Diag(Target->getLocation(), diag::note_using_decl_target); 4420 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4421 return true; 4422 } 4423 4424 // Target is not a function. 4425 4426 if (isa<TagDecl>(Target)) { 4427 // No conflict between a tag and a non-tag. 4428 if (!Tag) return false; 4429 4430 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4431 Diag(Target->getLocation(), diag::note_using_decl_target); 4432 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4433 return true; 4434 } 4435 4436 // No conflict between a tag and a non-tag. 4437 if (!NonTag) return false; 4438 4439 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4440 Diag(Target->getLocation(), diag::note_using_decl_target); 4441 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4442 return true; 4443} 4444 4445/// Builds a shadow declaration corresponding to a 'using' declaration. 4446UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4447 UsingDecl *UD, 4448 NamedDecl *Orig) { 4449 4450 // If we resolved to another shadow declaration, just coalesce them. 4451 NamedDecl *Target = Orig; 4452 if (isa<UsingShadowDecl>(Target)) { 4453 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4454 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4455 } 4456 4457 UsingShadowDecl *Shadow 4458 = UsingShadowDecl::Create(Context, CurContext, 4459 UD->getLocation(), UD, Target); 4460 UD->addShadowDecl(Shadow); 4461 4462 Shadow->setAccess(UD->getAccess()); 4463 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4464 Shadow->setInvalidDecl(); 4465 4466 if (S) 4467 PushOnScopeChains(Shadow, S); 4468 else 4469 CurContext->addDecl(Shadow); 4470 4471 4472 return Shadow; 4473} 4474 4475/// Hides a using shadow declaration. This is required by the current 4476/// using-decl implementation when a resolvable using declaration in a 4477/// class is followed by a declaration which would hide or override 4478/// one or more of the using decl's targets; for example: 4479/// 4480/// struct Base { void foo(int); }; 4481/// struct Derived : Base { 4482/// using Base::foo; 4483/// void foo(int); 4484/// }; 4485/// 4486/// The governing language is C++03 [namespace.udecl]p12: 4487/// 4488/// When a using-declaration brings names from a base class into a 4489/// derived class scope, member functions in the derived class 4490/// override and/or hide member functions with the same name and 4491/// parameter types in a base class (rather than conflicting). 4492/// 4493/// There are two ways to implement this: 4494/// (1) optimistically create shadow decls when they're not hidden 4495/// by existing declarations, or 4496/// (2) don't create any shadow decls (or at least don't make them 4497/// visible) until we've fully parsed/instantiated the class. 4498/// The problem with (1) is that we might have to retroactively remove 4499/// a shadow decl, which requires several O(n) operations because the 4500/// decl structures are (very reasonably) not designed for removal. 4501/// (2) avoids this but is very fiddly and phase-dependent. 4502void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4503 if (Shadow->getDeclName().getNameKind() == 4504 DeclarationName::CXXConversionFunctionName) 4505 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4506 4507 // Remove it from the DeclContext... 4508 Shadow->getDeclContext()->removeDecl(Shadow); 4509 4510 // ...and the scope, if applicable... 4511 if (S) { 4512 S->RemoveDecl(Shadow); 4513 IdResolver.RemoveDecl(Shadow); 4514 } 4515 4516 // ...and the using decl. 4517 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4518 4519 // TODO: complain somehow if Shadow was used. It shouldn't 4520 // be possible for this to happen, because...? 4521} 4522 4523/// Builds a using declaration. 4524/// 4525/// \param IsInstantiation - Whether this call arises from an 4526/// instantiation of an unresolved using declaration. We treat 4527/// the lookup differently for these declarations. 4528NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4529 SourceLocation UsingLoc, 4530 CXXScopeSpec &SS, 4531 const DeclarationNameInfo &NameInfo, 4532 AttributeList *AttrList, 4533 bool IsInstantiation, 4534 bool IsTypeName, 4535 SourceLocation TypenameLoc) { 4536 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4537 SourceLocation IdentLoc = NameInfo.getLoc(); 4538 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4539 4540 // FIXME: We ignore attributes for now. 4541 4542 if (SS.isEmpty()) { 4543 Diag(IdentLoc, diag::err_using_requires_qualname); 4544 return 0; 4545 } 4546 4547 // Do the redeclaration lookup in the current scope. 4548 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4549 ForRedeclaration); 4550 Previous.setHideTags(false); 4551 if (S) { 4552 LookupName(Previous, S); 4553 4554 // It is really dumb that we have to do this. 4555 LookupResult::Filter F = Previous.makeFilter(); 4556 while (F.hasNext()) { 4557 NamedDecl *D = F.next(); 4558 if (!isDeclInScope(D, CurContext, S)) 4559 F.erase(); 4560 } 4561 F.done(); 4562 } else { 4563 assert(IsInstantiation && "no scope in non-instantiation"); 4564 assert(CurContext->isRecord() && "scope not record in instantiation"); 4565 LookupQualifiedName(Previous, CurContext); 4566 } 4567 4568 // Check for invalid redeclarations. 4569 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4570 return 0; 4571 4572 // Check for bad qualifiers. 4573 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4574 return 0; 4575 4576 DeclContext *LookupContext = computeDeclContext(SS); 4577 NamedDecl *D; 4578 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4579 if (!LookupContext) { 4580 if (IsTypeName) { 4581 // FIXME: not all declaration name kinds are legal here 4582 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4583 UsingLoc, TypenameLoc, 4584 QualifierLoc, 4585 IdentLoc, NameInfo.getName()); 4586 } else { 4587 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4588 QualifierLoc, NameInfo); 4589 } 4590 } else { 4591 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4592 NameInfo, IsTypeName); 4593 } 4594 D->setAccess(AS); 4595 CurContext->addDecl(D); 4596 4597 if (!LookupContext) return D; 4598 UsingDecl *UD = cast<UsingDecl>(D); 4599 4600 if (RequireCompleteDeclContext(SS, LookupContext)) { 4601 UD->setInvalidDecl(); 4602 return UD; 4603 } 4604 4605 // Constructor inheriting using decls get special treatment. 4606 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4607 if (CheckInheritedConstructorUsingDecl(UD)) 4608 UD->setInvalidDecl(); 4609 return UD; 4610 } 4611 4612 // Otherwise, look up the target name. 4613 4614 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4615 4616 // Unlike most lookups, we don't always want to hide tag 4617 // declarations: tag names are visible through the using declaration 4618 // even if hidden by ordinary names, *except* in a dependent context 4619 // where it's important for the sanity of two-phase lookup. 4620 if (!IsInstantiation) 4621 R.setHideTags(false); 4622 4623 LookupQualifiedName(R, LookupContext); 4624 4625 if (R.empty()) { 4626 Diag(IdentLoc, diag::err_no_member) 4627 << NameInfo.getName() << LookupContext << SS.getRange(); 4628 UD->setInvalidDecl(); 4629 return UD; 4630 } 4631 4632 if (R.isAmbiguous()) { 4633 UD->setInvalidDecl(); 4634 return UD; 4635 } 4636 4637 if (IsTypeName) { 4638 // If we asked for a typename and got a non-type decl, error out. 4639 if (!R.getAsSingle<TypeDecl>()) { 4640 Diag(IdentLoc, diag::err_using_typename_non_type); 4641 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4642 Diag((*I)->getUnderlyingDecl()->getLocation(), 4643 diag::note_using_decl_target); 4644 UD->setInvalidDecl(); 4645 return UD; 4646 } 4647 } else { 4648 // If we asked for a non-typename and we got a type, error out, 4649 // but only if this is an instantiation of an unresolved using 4650 // decl. Otherwise just silently find the type name. 4651 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4652 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4653 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4654 UD->setInvalidDecl(); 4655 return UD; 4656 } 4657 } 4658 4659 // C++0x N2914 [namespace.udecl]p6: 4660 // A using-declaration shall not name a namespace. 4661 if (R.getAsSingle<NamespaceDecl>()) { 4662 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4663 << SS.getRange(); 4664 UD->setInvalidDecl(); 4665 return UD; 4666 } 4667 4668 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4669 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4670 BuildUsingShadowDecl(S, UD, *I); 4671 } 4672 4673 return UD; 4674} 4675 4676/// Additional checks for a using declaration referring to a constructor name. 4677bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4678 if (UD->isTypeName()) { 4679 // FIXME: Cannot specify typename when specifying constructor 4680 return true; 4681 } 4682 4683 const Type *SourceType = UD->getQualifier()->getAsType(); 4684 assert(SourceType && 4685 "Using decl naming constructor doesn't have type in scope spec."); 4686 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4687 4688 // Check whether the named type is a direct base class. 4689 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4690 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4691 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4692 BaseIt != BaseE; ++BaseIt) { 4693 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4694 if (CanonicalSourceType == BaseType) 4695 break; 4696 } 4697 4698 if (BaseIt == BaseE) { 4699 // Did not find SourceType in the bases. 4700 Diag(UD->getUsingLocation(), 4701 diag::err_using_decl_constructor_not_in_direct_base) 4702 << UD->getNameInfo().getSourceRange() 4703 << QualType(SourceType, 0) << TargetClass; 4704 return true; 4705 } 4706 4707 BaseIt->setInheritConstructors(); 4708 4709 return false; 4710} 4711 4712/// Checks that the given using declaration is not an invalid 4713/// redeclaration. Note that this is checking only for the using decl 4714/// itself, not for any ill-formedness among the UsingShadowDecls. 4715bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4716 bool isTypeName, 4717 const CXXScopeSpec &SS, 4718 SourceLocation NameLoc, 4719 const LookupResult &Prev) { 4720 // C++03 [namespace.udecl]p8: 4721 // C++0x [namespace.udecl]p10: 4722 // A using-declaration is a declaration and can therefore be used 4723 // repeatedly where (and only where) multiple declarations are 4724 // allowed. 4725 // 4726 // That's in non-member contexts. 4727 if (!CurContext->getRedeclContext()->isRecord()) 4728 return false; 4729 4730 NestedNameSpecifier *Qual 4731 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4732 4733 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4734 NamedDecl *D = *I; 4735 4736 bool DTypename; 4737 NestedNameSpecifier *DQual; 4738 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4739 DTypename = UD->isTypeName(); 4740 DQual = UD->getQualifier(); 4741 } else if (UnresolvedUsingValueDecl *UD 4742 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4743 DTypename = false; 4744 DQual = UD->getQualifier(); 4745 } else if (UnresolvedUsingTypenameDecl *UD 4746 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4747 DTypename = true; 4748 DQual = UD->getQualifier(); 4749 } else continue; 4750 4751 // using decls differ if one says 'typename' and the other doesn't. 4752 // FIXME: non-dependent using decls? 4753 if (isTypeName != DTypename) continue; 4754 4755 // using decls differ if they name different scopes (but note that 4756 // template instantiation can cause this check to trigger when it 4757 // didn't before instantiation). 4758 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4759 Context.getCanonicalNestedNameSpecifier(DQual)) 4760 continue; 4761 4762 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4763 Diag(D->getLocation(), diag::note_using_decl) << 1; 4764 return true; 4765 } 4766 4767 return false; 4768} 4769 4770 4771/// Checks that the given nested-name qualifier used in a using decl 4772/// in the current context is appropriately related to the current 4773/// scope. If an error is found, diagnoses it and returns true. 4774bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4775 const CXXScopeSpec &SS, 4776 SourceLocation NameLoc) { 4777 DeclContext *NamedContext = computeDeclContext(SS); 4778 4779 if (!CurContext->isRecord()) { 4780 // C++03 [namespace.udecl]p3: 4781 // C++0x [namespace.udecl]p8: 4782 // A using-declaration for a class member shall be a member-declaration. 4783 4784 // If we weren't able to compute a valid scope, it must be a 4785 // dependent class scope. 4786 if (!NamedContext || NamedContext->isRecord()) { 4787 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4788 << SS.getRange(); 4789 return true; 4790 } 4791 4792 // Otherwise, everything is known to be fine. 4793 return false; 4794 } 4795 4796 // The current scope is a record. 4797 4798 // If the named context is dependent, we can't decide much. 4799 if (!NamedContext) { 4800 // FIXME: in C++0x, we can diagnose if we can prove that the 4801 // nested-name-specifier does not refer to a base class, which is 4802 // still possible in some cases. 4803 4804 // Otherwise we have to conservatively report that things might be 4805 // okay. 4806 return false; 4807 } 4808 4809 if (!NamedContext->isRecord()) { 4810 // Ideally this would point at the last name in the specifier, 4811 // but we don't have that level of source info. 4812 Diag(SS.getRange().getBegin(), 4813 diag::err_using_decl_nested_name_specifier_is_not_class) 4814 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4815 return true; 4816 } 4817 4818 if (!NamedContext->isDependentContext() && 4819 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4820 return true; 4821 4822 if (getLangOptions().CPlusPlus0x) { 4823 // C++0x [namespace.udecl]p3: 4824 // In a using-declaration used as a member-declaration, the 4825 // nested-name-specifier shall name a base class of the class 4826 // being defined. 4827 4828 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4829 cast<CXXRecordDecl>(NamedContext))) { 4830 if (CurContext == NamedContext) { 4831 Diag(NameLoc, 4832 diag::err_using_decl_nested_name_specifier_is_current_class) 4833 << SS.getRange(); 4834 return true; 4835 } 4836 4837 Diag(SS.getRange().getBegin(), 4838 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4839 << (NestedNameSpecifier*) SS.getScopeRep() 4840 << cast<CXXRecordDecl>(CurContext) 4841 << SS.getRange(); 4842 return true; 4843 } 4844 4845 return false; 4846 } 4847 4848 // C++03 [namespace.udecl]p4: 4849 // A using-declaration used as a member-declaration shall refer 4850 // to a member of a base class of the class being defined [etc.]. 4851 4852 // Salient point: SS doesn't have to name a base class as long as 4853 // lookup only finds members from base classes. Therefore we can 4854 // diagnose here only if we can prove that that can't happen, 4855 // i.e. if the class hierarchies provably don't intersect. 4856 4857 // TODO: it would be nice if "definitely valid" results were cached 4858 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4859 // need to be repeated. 4860 4861 struct UserData { 4862 llvm::DenseSet<const CXXRecordDecl*> Bases; 4863 4864 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4865 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4866 Data->Bases.insert(Base); 4867 return true; 4868 } 4869 4870 bool hasDependentBases(const CXXRecordDecl *Class) { 4871 return !Class->forallBases(collect, this); 4872 } 4873 4874 /// Returns true if the base is dependent or is one of the 4875 /// accumulated base classes. 4876 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4877 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4878 return !Data->Bases.count(Base); 4879 } 4880 4881 bool mightShareBases(const CXXRecordDecl *Class) { 4882 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4883 } 4884 }; 4885 4886 UserData Data; 4887 4888 // Returns false if we find a dependent base. 4889 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4890 return false; 4891 4892 // Returns false if the class has a dependent base or if it or one 4893 // of its bases is present in the base set of the current context. 4894 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4895 return false; 4896 4897 Diag(SS.getRange().getBegin(), 4898 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4899 << (NestedNameSpecifier*) SS.getScopeRep() 4900 << cast<CXXRecordDecl>(CurContext) 4901 << SS.getRange(); 4902 4903 return true; 4904} 4905 4906Decl *Sema::ActOnAliasDeclaration(Scope *S, 4907 AccessSpecifier AS, 4908 MultiTemplateParamsArg TemplateParamLists, 4909 SourceLocation UsingLoc, 4910 UnqualifiedId &Name, 4911 TypeResult Type) { 4912 // Skip up to the relevant declaration scope. 4913 while (S->getFlags() & Scope::TemplateParamScope) 4914 S = S->getParent(); 4915 assert((S->getFlags() & Scope::DeclScope) && 4916 "got alias-declaration outside of declaration scope"); 4917 4918 if (Type.isInvalid()) 4919 return 0; 4920 4921 bool Invalid = false; 4922 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4923 TypeSourceInfo *TInfo = 0; 4924 GetTypeFromParser(Type.get(), &TInfo); 4925 4926 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4927 return 0; 4928 4929 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4930 UPPC_DeclarationType)) { 4931 Invalid = true; 4932 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 4933 TInfo->getTypeLoc().getBeginLoc()); 4934 } 4935 4936 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4937 LookupName(Previous, S); 4938 4939 // Warn about shadowing the name of a template parameter. 4940 if (Previous.isSingleResult() && 4941 Previous.getFoundDecl()->isTemplateParameter()) { 4942 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4943 Previous.getFoundDecl())) 4944 Invalid = true; 4945 Previous.clear(); 4946 } 4947 4948 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4949 "name in alias declaration must be an identifier"); 4950 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4951 Name.StartLocation, 4952 Name.Identifier, TInfo); 4953 4954 NewTD->setAccess(AS); 4955 4956 if (Invalid) 4957 NewTD->setInvalidDecl(); 4958 4959 CheckTypedefForVariablyModifiedType(S, NewTD); 4960 Invalid |= NewTD->isInvalidDecl(); 4961 4962 bool Redeclaration = false; 4963 4964 NamedDecl *NewND; 4965 if (TemplateParamLists.size()) { 4966 TypeAliasTemplateDecl *OldDecl = 0; 4967 TemplateParameterList *OldTemplateParams = 0; 4968 4969 if (TemplateParamLists.size() != 1) { 4970 Diag(UsingLoc, diag::err_alias_template_extra_headers) 4971 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 4972 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 4973 } 4974 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 4975 4976 // Only consider previous declarations in the same scope. 4977 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 4978 /*ExplicitInstantiationOrSpecialization*/false); 4979 if (!Previous.empty()) { 4980 Redeclaration = true; 4981 4982 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 4983 if (!OldDecl && !Invalid) { 4984 Diag(UsingLoc, diag::err_redefinition_different_kind) 4985 << Name.Identifier; 4986 4987 NamedDecl *OldD = Previous.getRepresentativeDecl(); 4988 if (OldD->getLocation().isValid()) 4989 Diag(OldD->getLocation(), diag::note_previous_definition); 4990 4991 Invalid = true; 4992 } 4993 4994 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 4995 if (TemplateParameterListsAreEqual(TemplateParams, 4996 OldDecl->getTemplateParameters(), 4997 /*Complain=*/true, 4998 TPL_TemplateMatch)) 4999 OldTemplateParams = OldDecl->getTemplateParameters(); 5000 else 5001 Invalid = true; 5002 5003 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5004 if (!Invalid && 5005 !Context.hasSameType(OldTD->getUnderlyingType(), 5006 NewTD->getUnderlyingType())) { 5007 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5008 // but we can't reasonably accept it. 5009 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5010 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5011 if (OldTD->getLocation().isValid()) 5012 Diag(OldTD->getLocation(), diag::note_previous_definition); 5013 Invalid = true; 5014 } 5015 } 5016 } 5017 5018 // Merge any previous default template arguments into our parameters, 5019 // and check the parameter list. 5020 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5021 TPC_TypeAliasTemplate)) 5022 return 0; 5023 5024 TypeAliasTemplateDecl *NewDecl = 5025 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5026 Name.Identifier, TemplateParams, 5027 NewTD); 5028 5029 NewDecl->setAccess(AS); 5030 5031 if (Invalid) 5032 NewDecl->setInvalidDecl(); 5033 else if (OldDecl) 5034 NewDecl->setPreviousDeclaration(OldDecl); 5035 5036 NewND = NewDecl; 5037 } else { 5038 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5039 NewND = NewTD; 5040 } 5041 5042 if (!Redeclaration) 5043 PushOnScopeChains(NewND, S); 5044 5045 return NewND; 5046} 5047 5048Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5049 SourceLocation NamespaceLoc, 5050 SourceLocation AliasLoc, 5051 IdentifierInfo *Alias, 5052 CXXScopeSpec &SS, 5053 SourceLocation IdentLoc, 5054 IdentifierInfo *Ident) { 5055 5056 // Lookup the namespace name. 5057 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5058 LookupParsedName(R, S, &SS); 5059 5060 // Check if we have a previous declaration with the same name. 5061 NamedDecl *PrevDecl 5062 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5063 ForRedeclaration); 5064 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5065 PrevDecl = 0; 5066 5067 if (PrevDecl) { 5068 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5069 // We already have an alias with the same name that points to the same 5070 // namespace, so don't create a new one. 5071 // FIXME: At some point, we'll want to create the (redundant) 5072 // declaration to maintain better source information. 5073 if (!R.isAmbiguous() && !R.empty() && 5074 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5075 return 0; 5076 } 5077 5078 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5079 diag::err_redefinition_different_kind; 5080 Diag(AliasLoc, DiagID) << Alias; 5081 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5082 return 0; 5083 } 5084 5085 if (R.isAmbiguous()) 5086 return 0; 5087 5088 if (R.empty()) { 5089 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5090 CTC_NoKeywords, 0)) { 5091 if (R.getAsSingle<NamespaceDecl>() || 5092 R.getAsSingle<NamespaceAliasDecl>()) { 5093 if (DeclContext *DC = computeDeclContext(SS, false)) 5094 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5095 << Ident << DC << Corrected << SS.getRange() 5096 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5097 else 5098 Diag(IdentLoc, diag::err_using_directive_suggest) 5099 << Ident << Corrected 5100 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5101 5102 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5103 << Corrected; 5104 5105 Ident = Corrected.getAsIdentifierInfo(); 5106 } else { 5107 R.clear(); 5108 R.setLookupName(Ident); 5109 } 5110 } 5111 5112 if (R.empty()) { 5113 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5114 return 0; 5115 } 5116 } 5117 5118 NamespaceAliasDecl *AliasDecl = 5119 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5120 Alias, SS.getWithLocInContext(Context), 5121 IdentLoc, R.getFoundDecl()); 5122 5123 PushOnScopeChains(AliasDecl, S); 5124 return AliasDecl; 5125} 5126 5127namespace { 5128 /// \brief Scoped object used to handle the state changes required in Sema 5129 /// to implicitly define the body of a C++ member function; 5130 class ImplicitlyDefinedFunctionScope { 5131 Sema &S; 5132 Sema::ContextRAII SavedContext; 5133 5134 public: 5135 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5136 : S(S), SavedContext(S, Method) 5137 { 5138 S.PushFunctionScope(); 5139 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5140 } 5141 5142 ~ImplicitlyDefinedFunctionScope() { 5143 S.PopExpressionEvaluationContext(); 5144 S.PopFunctionOrBlockScope(); 5145 } 5146 }; 5147} 5148 5149static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 5150 CXXRecordDecl *D) { 5151 ASTContext &Context = Self.Context; 5152 QualType ClassType = Context.getTypeDeclType(D); 5153 DeclarationName ConstructorName 5154 = Context.DeclarationNames.getCXXConstructorName( 5155 Context.getCanonicalType(ClassType.getUnqualifiedType())); 5156 5157 DeclContext::lookup_const_iterator Con, ConEnd; 5158 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 5159 Con != ConEnd; ++Con) { 5160 // FIXME: In C++0x, a constructor template can be a default constructor. 5161 if (isa<FunctionTemplateDecl>(*Con)) 5162 continue; 5163 5164 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 5165 if (Constructor->isDefaultConstructor()) 5166 return Constructor; 5167 } 5168 return 0; 5169} 5170 5171Sema::ImplicitExceptionSpecification 5172Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5173 // C++ [except.spec]p14: 5174 // An implicitly declared special member function (Clause 12) shall have an 5175 // exception-specification. [...] 5176 ImplicitExceptionSpecification ExceptSpec(Context); 5177 5178 // Direct base-class constructors. 5179 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5180 BEnd = ClassDecl->bases_end(); 5181 B != BEnd; ++B) { 5182 if (B->isVirtual()) // Handled below. 5183 continue; 5184 5185 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5186 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5187 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5188 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5189 else if (CXXConstructorDecl *Constructor 5190 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5191 ExceptSpec.CalledDecl(Constructor); 5192 } 5193 } 5194 5195 // Virtual base-class constructors. 5196 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5197 BEnd = ClassDecl->vbases_end(); 5198 B != BEnd; ++B) { 5199 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5200 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5201 if (BaseClassDecl->needsImplicitDefaultConstructor()) 5202 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5203 else if (CXXConstructorDecl *Constructor 5204 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5205 ExceptSpec.CalledDecl(Constructor); 5206 } 5207 } 5208 5209 // Field constructors. 5210 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5211 FEnd = ClassDecl->field_end(); 5212 F != FEnd; ++F) { 5213 if (const RecordType *RecordTy 5214 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5215 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5216 if (FieldClassDecl->needsImplicitDefaultConstructor()) 5217 ExceptSpec.CalledDecl( 5218 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5219 else if (CXXConstructorDecl *Constructor 5220 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5221 ExceptSpec.CalledDecl(Constructor); 5222 } 5223 } 5224 5225 return ExceptSpec; 5226} 5227 5228CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5229 CXXRecordDecl *ClassDecl) { 5230 // C++ [class.ctor]p5: 5231 // A default constructor for a class X is a constructor of class X 5232 // that can be called without an argument. If there is no 5233 // user-declared constructor for class X, a default constructor is 5234 // implicitly declared. An implicitly-declared default constructor 5235 // is an inline public member of its class. 5236 assert(!ClassDecl->hasUserDeclaredConstructor() && 5237 "Should not build implicit default constructor!"); 5238 5239 ImplicitExceptionSpecification Spec = 5240 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5241 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5242 5243 // Create the actual constructor declaration. 5244 CanQualType ClassType 5245 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5246 SourceLocation ClassLoc = ClassDecl->getLocation(); 5247 DeclarationName Name 5248 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5249 DeclarationNameInfo NameInfo(Name, ClassLoc); 5250 CXXConstructorDecl *DefaultCon 5251 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5252 Context.getFunctionType(Context.VoidTy, 5253 0, 0, EPI), 5254 /*TInfo=*/0, 5255 /*isExplicit=*/false, 5256 /*isInline=*/true, 5257 /*isImplicitlyDeclared=*/true); 5258 DefaultCon->setAccess(AS_public); 5259 DefaultCon->setDefaulted(); 5260 DefaultCon->setImplicit(); 5261 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5262 5263 // Note that we have declared this constructor. 5264 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5265 5266 // Do not delete this yet if we're in a template 5267 if (!ClassDecl->isDependentType() && 5268 ShouldDeleteDefaultConstructor(DefaultCon)) 5269 DefaultCon->setDeletedAsWritten(); 5270 5271 if (Scope *S = getScopeForContext(ClassDecl)) 5272 PushOnScopeChains(DefaultCon, S, false); 5273 ClassDecl->addDecl(DefaultCon); 5274 5275 return DefaultCon; 5276} 5277 5278void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5279 CXXConstructorDecl *Constructor) { 5280 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 5281 !Constructor->isUsed(false) && !Constructor->isDeleted()) && 5282 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5283 5284 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5285 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5286 5287 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5288 DiagnosticErrorTrap Trap(Diags); 5289 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5290 Trap.hasErrorOccurred()) { 5291 Diag(CurrentLocation, diag::note_member_synthesized_at) 5292 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 5293 Constructor->setInvalidDecl(); 5294 return; 5295 } 5296 5297 SourceLocation Loc = Constructor->getLocation(); 5298 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5299 5300 Constructor->setUsed(); 5301 MarkVTableUsed(CurrentLocation, ClassDecl); 5302 5303 if (ASTMutationListener *L = getASTMutationListener()) { 5304 L->CompletedImplicitDefinition(Constructor); 5305 } 5306} 5307 5308void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5309 // We start with an initial pass over the base classes to collect those that 5310 // inherit constructors from. If there are none, we can forgo all further 5311 // processing. 5312 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5313 BasesVector BasesToInheritFrom; 5314 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5315 BaseE = ClassDecl->bases_end(); 5316 BaseIt != BaseE; ++BaseIt) { 5317 if (BaseIt->getInheritConstructors()) { 5318 QualType Base = BaseIt->getType(); 5319 if (Base->isDependentType()) { 5320 // If we inherit constructors from anything that is dependent, just 5321 // abort processing altogether. We'll get another chance for the 5322 // instantiations. 5323 return; 5324 } 5325 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5326 } 5327 } 5328 if (BasesToInheritFrom.empty()) 5329 return; 5330 5331 // Now collect the constructors that we already have in the current class. 5332 // Those take precedence over inherited constructors. 5333 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5334 // unless there is a user-declared constructor with the same signature in 5335 // the class where the using-declaration appears. 5336 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5337 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5338 CtorE = ClassDecl->ctor_end(); 5339 CtorIt != CtorE; ++CtorIt) { 5340 ExistingConstructors.insert( 5341 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5342 } 5343 5344 Scope *S = getScopeForContext(ClassDecl); 5345 DeclarationName CreatedCtorName = 5346 Context.DeclarationNames.getCXXConstructorName( 5347 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5348 5349 // Now comes the true work. 5350 // First, we keep a map from constructor types to the base that introduced 5351 // them. Needed for finding conflicting constructors. We also keep the 5352 // actually inserted declarations in there, for pretty diagnostics. 5353 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5354 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5355 ConstructorToSourceMap InheritedConstructors; 5356 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5357 BaseE = BasesToInheritFrom.end(); 5358 BaseIt != BaseE; ++BaseIt) { 5359 const RecordType *Base = *BaseIt; 5360 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5361 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5362 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5363 CtorE = BaseDecl->ctor_end(); 5364 CtorIt != CtorE; ++CtorIt) { 5365 // Find the using declaration for inheriting this base's constructors. 5366 DeclarationName Name = 5367 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5368 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5369 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5370 SourceLocation UsingLoc = UD ? UD->getLocation() : 5371 ClassDecl->getLocation(); 5372 5373 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5374 // from the class X named in the using-declaration consists of actual 5375 // constructors and notional constructors that result from the 5376 // transformation of defaulted parameters as follows: 5377 // - all non-template default constructors of X, and 5378 // - for each non-template constructor of X that has at least one 5379 // parameter with a default argument, the set of constructors that 5380 // results from omitting any ellipsis parameter specification and 5381 // successively omitting parameters with a default argument from the 5382 // end of the parameter-type-list. 5383 CXXConstructorDecl *BaseCtor = *CtorIt; 5384 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5385 const FunctionProtoType *BaseCtorType = 5386 BaseCtor->getType()->getAs<FunctionProtoType>(); 5387 5388 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5389 maxParams = BaseCtor->getNumParams(); 5390 params <= maxParams; ++params) { 5391 // Skip default constructors. They're never inherited. 5392 if (params == 0) 5393 continue; 5394 // Skip copy and move constructors for the same reason. 5395 if (CanBeCopyOrMove && params == 1) 5396 continue; 5397 5398 // Build up a function type for this particular constructor. 5399 // FIXME: The working paper does not consider that the exception spec 5400 // for the inheriting constructor might be larger than that of the 5401 // source. This code doesn't yet, either. 5402 const Type *NewCtorType; 5403 if (params == maxParams) 5404 NewCtorType = BaseCtorType; 5405 else { 5406 llvm::SmallVector<QualType, 16> Args; 5407 for (unsigned i = 0; i < params; ++i) { 5408 Args.push_back(BaseCtorType->getArgType(i)); 5409 } 5410 FunctionProtoType::ExtProtoInfo ExtInfo = 5411 BaseCtorType->getExtProtoInfo(); 5412 ExtInfo.Variadic = false; 5413 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5414 Args.data(), params, ExtInfo) 5415 .getTypePtr(); 5416 } 5417 const Type *CanonicalNewCtorType = 5418 Context.getCanonicalType(NewCtorType); 5419 5420 // Now that we have the type, first check if the class already has a 5421 // constructor with this signature. 5422 if (ExistingConstructors.count(CanonicalNewCtorType)) 5423 continue; 5424 5425 // Then we check if we have already declared an inherited constructor 5426 // with this signature. 5427 std::pair<ConstructorToSourceMap::iterator, bool> result = 5428 InheritedConstructors.insert(std::make_pair( 5429 CanonicalNewCtorType, 5430 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5431 if (!result.second) { 5432 // Already in the map. If it came from a different class, that's an 5433 // error. Not if it's from the same. 5434 CanQualType PreviousBase = result.first->second.first; 5435 if (CanonicalBase != PreviousBase) { 5436 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5437 const CXXConstructorDecl *PrevBaseCtor = 5438 PrevCtor->getInheritedConstructor(); 5439 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5440 5441 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5442 Diag(BaseCtor->getLocation(), 5443 diag::note_using_decl_constructor_conflict_current_ctor); 5444 Diag(PrevBaseCtor->getLocation(), 5445 diag::note_using_decl_constructor_conflict_previous_ctor); 5446 Diag(PrevCtor->getLocation(), 5447 diag::note_using_decl_constructor_conflict_previous_using); 5448 } 5449 continue; 5450 } 5451 5452 // OK, we're there, now add the constructor. 5453 // C++0x [class.inhctor]p8: [...] that would be performed by a 5454 // user-writtern inline constructor [...] 5455 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5456 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5457 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5458 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5459 /*ImplicitlyDeclared=*/true); 5460 NewCtor->setAccess(BaseCtor->getAccess()); 5461 5462 // Build up the parameter decls and add them. 5463 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5464 for (unsigned i = 0; i < params; ++i) { 5465 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5466 UsingLoc, UsingLoc, 5467 /*IdentifierInfo=*/0, 5468 BaseCtorType->getArgType(i), 5469 /*TInfo=*/0, SC_None, 5470 SC_None, /*DefaultArg=*/0)); 5471 } 5472 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5473 NewCtor->setInheritedConstructor(BaseCtor); 5474 5475 PushOnScopeChains(NewCtor, S, false); 5476 ClassDecl->addDecl(NewCtor); 5477 result.first->second.second = NewCtor; 5478 } 5479 } 5480 } 5481} 5482 5483CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5484 // C++ [class.dtor]p2: 5485 // If a class has no user-declared destructor, a destructor is 5486 // declared implicitly. An implicitly-declared destructor is an 5487 // inline public member of its class. 5488 5489 // C++ [except.spec]p14: 5490 // An implicitly declared special member function (Clause 12) shall have 5491 // an exception-specification. 5492 ImplicitExceptionSpecification ExceptSpec(Context); 5493 5494 // Direct base-class destructors. 5495 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5496 BEnd = ClassDecl->bases_end(); 5497 B != BEnd; ++B) { 5498 if (B->isVirtual()) // Handled below. 5499 continue; 5500 5501 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5502 ExceptSpec.CalledDecl( 5503 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5504 } 5505 5506 // Virtual base-class destructors. 5507 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5508 BEnd = ClassDecl->vbases_end(); 5509 B != BEnd; ++B) { 5510 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5511 ExceptSpec.CalledDecl( 5512 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5513 } 5514 5515 // Field destructors. 5516 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5517 FEnd = ClassDecl->field_end(); 5518 F != FEnd; ++F) { 5519 if (const RecordType *RecordTy 5520 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5521 ExceptSpec.CalledDecl( 5522 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5523 } 5524 5525 // Create the actual destructor declaration. 5526 FunctionProtoType::ExtProtoInfo EPI; 5527 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5528 EPI.NumExceptions = ExceptSpec.size(); 5529 EPI.Exceptions = ExceptSpec.data(); 5530 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5531 5532 CanQualType ClassType 5533 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5534 SourceLocation ClassLoc = ClassDecl->getLocation(); 5535 DeclarationName Name 5536 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5537 DeclarationNameInfo NameInfo(Name, ClassLoc); 5538 CXXDestructorDecl *Destructor 5539 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5540 /*isInline=*/true, 5541 /*isImplicitlyDeclared=*/true); 5542 Destructor->setAccess(AS_public); 5543 Destructor->setImplicit(); 5544 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5545 5546 // Note that we have declared this destructor. 5547 ++ASTContext::NumImplicitDestructorsDeclared; 5548 5549 // Introduce this destructor into its scope. 5550 if (Scope *S = getScopeForContext(ClassDecl)) 5551 PushOnScopeChains(Destructor, S, false); 5552 ClassDecl->addDecl(Destructor); 5553 5554 // This could be uniqued if it ever proves significant. 5555 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5556 5557 AddOverriddenMethods(ClassDecl, Destructor); 5558 5559 return Destructor; 5560} 5561 5562void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5563 CXXDestructorDecl *Destructor) { 5564 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5565 "DefineImplicitDestructor - call it for implicit default dtor"); 5566 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5567 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5568 5569 if (Destructor->isInvalidDecl()) 5570 return; 5571 5572 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5573 5574 DiagnosticErrorTrap Trap(Diags); 5575 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5576 Destructor->getParent()); 5577 5578 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5579 Diag(CurrentLocation, diag::note_member_synthesized_at) 5580 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5581 5582 Destructor->setInvalidDecl(); 5583 return; 5584 } 5585 5586 SourceLocation Loc = Destructor->getLocation(); 5587 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5588 5589 Destructor->setUsed(); 5590 MarkVTableUsed(CurrentLocation, ClassDecl); 5591 5592 if (ASTMutationListener *L = getASTMutationListener()) { 5593 L->CompletedImplicitDefinition(Destructor); 5594 } 5595} 5596 5597/// \brief Builds a statement that copies the given entity from \p From to 5598/// \c To. 5599/// 5600/// This routine is used to copy the members of a class with an 5601/// implicitly-declared copy assignment operator. When the entities being 5602/// copied are arrays, this routine builds for loops to copy them. 5603/// 5604/// \param S The Sema object used for type-checking. 5605/// 5606/// \param Loc The location where the implicit copy is being generated. 5607/// 5608/// \param T The type of the expressions being copied. Both expressions must 5609/// have this type. 5610/// 5611/// \param To The expression we are copying to. 5612/// 5613/// \param From The expression we are copying from. 5614/// 5615/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5616/// Otherwise, it's a non-static member subobject. 5617/// 5618/// \param Depth Internal parameter recording the depth of the recursion. 5619/// 5620/// \returns A statement or a loop that copies the expressions. 5621static StmtResult 5622BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5623 Expr *To, Expr *From, 5624 bool CopyingBaseSubobject, unsigned Depth = 0) { 5625 // C++0x [class.copy]p30: 5626 // Each subobject is assigned in the manner appropriate to its type: 5627 // 5628 // - if the subobject is of class type, the copy assignment operator 5629 // for the class is used (as if by explicit qualification; that is, 5630 // ignoring any possible virtual overriding functions in more derived 5631 // classes); 5632 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5633 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5634 5635 // Look for operator=. 5636 DeclarationName Name 5637 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5638 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5639 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5640 5641 // Filter out any result that isn't a copy-assignment operator. 5642 LookupResult::Filter F = OpLookup.makeFilter(); 5643 while (F.hasNext()) { 5644 NamedDecl *D = F.next(); 5645 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5646 if (Method->isCopyAssignmentOperator()) 5647 continue; 5648 5649 F.erase(); 5650 } 5651 F.done(); 5652 5653 // Suppress the protected check (C++ [class.protected]) for each of the 5654 // assignment operators we found. This strange dance is required when 5655 // we're assigning via a base classes's copy-assignment operator. To 5656 // ensure that we're getting the right base class subobject (without 5657 // ambiguities), we need to cast "this" to that subobject type; to 5658 // ensure that we don't go through the virtual call mechanism, we need 5659 // to qualify the operator= name with the base class (see below). However, 5660 // this means that if the base class has a protected copy assignment 5661 // operator, the protected member access check will fail. So, we 5662 // rewrite "protected" access to "public" access in this case, since we 5663 // know by construction that we're calling from a derived class. 5664 if (CopyingBaseSubobject) { 5665 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5666 L != LEnd; ++L) { 5667 if (L.getAccess() == AS_protected) 5668 L.setAccess(AS_public); 5669 } 5670 } 5671 5672 // Create the nested-name-specifier that will be used to qualify the 5673 // reference to operator=; this is required to suppress the virtual 5674 // call mechanism. 5675 CXXScopeSpec SS; 5676 SS.MakeTrivial(S.Context, 5677 NestedNameSpecifier::Create(S.Context, 0, false, 5678 T.getTypePtr()), 5679 Loc); 5680 5681 // Create the reference to operator=. 5682 ExprResult OpEqualRef 5683 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5684 /*FirstQualifierInScope=*/0, OpLookup, 5685 /*TemplateArgs=*/0, 5686 /*SuppressQualifierCheck=*/true); 5687 if (OpEqualRef.isInvalid()) 5688 return StmtError(); 5689 5690 // Build the call to the assignment operator. 5691 5692 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5693 OpEqualRef.takeAs<Expr>(), 5694 Loc, &From, 1, Loc); 5695 if (Call.isInvalid()) 5696 return StmtError(); 5697 5698 return S.Owned(Call.takeAs<Stmt>()); 5699 } 5700 5701 // - if the subobject is of scalar type, the built-in assignment 5702 // operator is used. 5703 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5704 if (!ArrayTy) { 5705 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5706 if (Assignment.isInvalid()) 5707 return StmtError(); 5708 5709 return S.Owned(Assignment.takeAs<Stmt>()); 5710 } 5711 5712 // - if the subobject is an array, each element is assigned, in the 5713 // manner appropriate to the element type; 5714 5715 // Construct a loop over the array bounds, e.g., 5716 // 5717 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5718 // 5719 // that will copy each of the array elements. 5720 QualType SizeType = S.Context.getSizeType(); 5721 5722 // Create the iteration variable. 5723 IdentifierInfo *IterationVarName = 0; 5724 { 5725 llvm::SmallString<8> Str; 5726 llvm::raw_svector_ostream OS(Str); 5727 OS << "__i" << Depth; 5728 IterationVarName = &S.Context.Idents.get(OS.str()); 5729 } 5730 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5731 IterationVarName, SizeType, 5732 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5733 SC_None, SC_None); 5734 5735 // Initialize the iteration variable to zero. 5736 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5737 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5738 5739 // Create a reference to the iteration variable; we'll use this several 5740 // times throughout. 5741 Expr *IterationVarRef 5742 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5743 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5744 5745 // Create the DeclStmt that holds the iteration variable. 5746 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5747 5748 // Create the comparison against the array bound. 5749 llvm::APInt Upper 5750 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5751 Expr *Comparison 5752 = new (S.Context) BinaryOperator(IterationVarRef, 5753 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5754 BO_NE, S.Context.BoolTy, 5755 VK_RValue, OK_Ordinary, Loc); 5756 5757 // Create the pre-increment of the iteration variable. 5758 Expr *Increment 5759 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5760 VK_LValue, OK_Ordinary, Loc); 5761 5762 // Subscript the "from" and "to" expressions with the iteration variable. 5763 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5764 IterationVarRef, Loc)); 5765 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5766 IterationVarRef, Loc)); 5767 5768 // Build the copy for an individual element of the array. 5769 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5770 To, From, CopyingBaseSubobject, 5771 Depth + 1); 5772 if (Copy.isInvalid()) 5773 return StmtError(); 5774 5775 // Construct the loop that copies all elements of this array. 5776 return S.ActOnForStmt(Loc, Loc, InitStmt, 5777 S.MakeFullExpr(Comparison), 5778 0, S.MakeFullExpr(Increment), 5779 Loc, Copy.take()); 5780} 5781 5782/// \brief Determine whether the given class has a copy assignment operator 5783/// that accepts a const-qualified argument. 5784static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5785 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5786 5787 if (!Class->hasDeclaredCopyAssignment()) 5788 S.DeclareImplicitCopyAssignment(Class); 5789 5790 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5791 DeclarationName OpName 5792 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5793 5794 DeclContext::lookup_const_iterator Op, OpEnd; 5795 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5796 // C++ [class.copy]p9: 5797 // A user-declared copy assignment operator is a non-static non-template 5798 // member function of class X with exactly one parameter of type X, X&, 5799 // const X&, volatile X& or const volatile X&. 5800 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5801 if (!Method) 5802 continue; 5803 5804 if (Method->isStatic()) 5805 continue; 5806 if (Method->getPrimaryTemplate()) 5807 continue; 5808 const FunctionProtoType *FnType = 5809 Method->getType()->getAs<FunctionProtoType>(); 5810 assert(FnType && "Overloaded operator has no prototype."); 5811 // Don't assert on this; an invalid decl might have been left in the AST. 5812 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5813 continue; 5814 bool AcceptsConst = true; 5815 QualType ArgType = FnType->getArgType(0); 5816 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5817 ArgType = Ref->getPointeeType(); 5818 // Is it a non-const lvalue reference? 5819 if (!ArgType.isConstQualified()) 5820 AcceptsConst = false; 5821 } 5822 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5823 continue; 5824 5825 // We have a single argument of type cv X or cv X&, i.e. we've found the 5826 // copy assignment operator. Return whether it accepts const arguments. 5827 return AcceptsConst; 5828 } 5829 assert(Class->isInvalidDecl() && 5830 "No copy assignment operator declared in valid code."); 5831 return false; 5832} 5833 5834CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5835 // Note: The following rules are largely analoguous to the copy 5836 // constructor rules. Note that virtual bases are not taken into account 5837 // for determining the argument type of the operator. Note also that 5838 // operators taking an object instead of a reference are allowed. 5839 5840 5841 // C++ [class.copy]p10: 5842 // If the class definition does not explicitly declare a copy 5843 // assignment operator, one is declared implicitly. 5844 // The implicitly-defined copy assignment operator for a class X 5845 // will have the form 5846 // 5847 // X& X::operator=(const X&) 5848 // 5849 // if 5850 bool HasConstCopyAssignment = true; 5851 5852 // -- each direct base class B of X has a copy assignment operator 5853 // whose parameter is of type const B&, const volatile B& or B, 5854 // and 5855 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5856 BaseEnd = ClassDecl->bases_end(); 5857 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5858 assert(!Base->getType()->isDependentType() && 5859 "Cannot generate implicit members for class with dependent bases."); 5860 const CXXRecordDecl *BaseClassDecl 5861 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5862 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5863 } 5864 5865 // -- for all the nonstatic data members of X that are of a class 5866 // type M (or array thereof), each such class type has a copy 5867 // assignment operator whose parameter is of type const M&, 5868 // const volatile M& or M. 5869 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5870 FieldEnd = ClassDecl->field_end(); 5871 HasConstCopyAssignment && Field != FieldEnd; 5872 ++Field) { 5873 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5874 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5875 const CXXRecordDecl *FieldClassDecl 5876 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5877 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5878 } 5879 } 5880 5881 // Otherwise, the implicitly declared copy assignment operator will 5882 // have the form 5883 // 5884 // X& X::operator=(X&) 5885 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5886 QualType RetType = Context.getLValueReferenceType(ArgType); 5887 if (HasConstCopyAssignment) 5888 ArgType = ArgType.withConst(); 5889 ArgType = Context.getLValueReferenceType(ArgType); 5890 5891 // C++ [except.spec]p14: 5892 // An implicitly declared special member function (Clause 12) shall have an 5893 // exception-specification. [...] 5894 ImplicitExceptionSpecification ExceptSpec(Context); 5895 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5896 BaseEnd = ClassDecl->bases_end(); 5897 Base != BaseEnd; ++Base) { 5898 CXXRecordDecl *BaseClassDecl 5899 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5900 5901 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5902 DeclareImplicitCopyAssignment(BaseClassDecl); 5903 5904 if (CXXMethodDecl *CopyAssign 5905 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5906 ExceptSpec.CalledDecl(CopyAssign); 5907 } 5908 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5909 FieldEnd = ClassDecl->field_end(); 5910 Field != FieldEnd; 5911 ++Field) { 5912 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5913 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5914 CXXRecordDecl *FieldClassDecl 5915 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5916 5917 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5918 DeclareImplicitCopyAssignment(FieldClassDecl); 5919 5920 if (CXXMethodDecl *CopyAssign 5921 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5922 ExceptSpec.CalledDecl(CopyAssign); 5923 } 5924 } 5925 5926 // An implicitly-declared copy assignment operator is an inline public 5927 // member of its class. 5928 FunctionProtoType::ExtProtoInfo EPI; 5929 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5930 EPI.NumExceptions = ExceptSpec.size(); 5931 EPI.Exceptions = ExceptSpec.data(); 5932 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5933 SourceLocation ClassLoc = ClassDecl->getLocation(); 5934 DeclarationNameInfo NameInfo(Name, ClassLoc); 5935 CXXMethodDecl *CopyAssignment 5936 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5937 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5938 /*TInfo=*/0, /*isStatic=*/false, 5939 /*StorageClassAsWritten=*/SC_None, 5940 /*isInline=*/true, 5941 SourceLocation()); 5942 CopyAssignment->setAccess(AS_public); 5943 CopyAssignment->setImplicit(); 5944 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5945 5946 // Add the parameter to the operator. 5947 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5948 ClassLoc, ClassLoc, /*Id=*/0, 5949 ArgType, /*TInfo=*/0, 5950 SC_None, 5951 SC_None, 0); 5952 CopyAssignment->setParams(&FromParam, 1); 5953 5954 // Note that we have added this copy-assignment operator. 5955 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5956 5957 if (Scope *S = getScopeForContext(ClassDecl)) 5958 PushOnScopeChains(CopyAssignment, S, false); 5959 ClassDecl->addDecl(CopyAssignment); 5960 5961 AddOverriddenMethods(ClassDecl, CopyAssignment); 5962 return CopyAssignment; 5963} 5964 5965void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5966 CXXMethodDecl *CopyAssignOperator) { 5967 assert((CopyAssignOperator->isImplicit() && 5968 CopyAssignOperator->isOverloadedOperator() && 5969 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5970 !CopyAssignOperator->isUsed(false)) && 5971 "DefineImplicitCopyAssignment called for wrong function"); 5972 5973 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5974 5975 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5976 CopyAssignOperator->setInvalidDecl(); 5977 return; 5978 } 5979 5980 CopyAssignOperator->setUsed(); 5981 5982 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5983 DiagnosticErrorTrap Trap(Diags); 5984 5985 // C++0x [class.copy]p30: 5986 // The implicitly-defined or explicitly-defaulted copy assignment operator 5987 // for a non-union class X performs memberwise copy assignment of its 5988 // subobjects. The direct base classes of X are assigned first, in the 5989 // order of their declaration in the base-specifier-list, and then the 5990 // immediate non-static data members of X are assigned, in the order in 5991 // which they were declared in the class definition. 5992 5993 // The statements that form the synthesized function body. 5994 ASTOwningVector<Stmt*> Statements(*this); 5995 5996 // The parameter for the "other" object, which we are copying from. 5997 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5998 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5999 QualType OtherRefType = Other->getType(); 6000 if (const LValueReferenceType *OtherRef 6001 = OtherRefType->getAs<LValueReferenceType>()) { 6002 OtherRefType = OtherRef->getPointeeType(); 6003 OtherQuals = OtherRefType.getQualifiers(); 6004 } 6005 6006 // Our location for everything implicitly-generated. 6007 SourceLocation Loc = CopyAssignOperator->getLocation(); 6008 6009 // Construct a reference to the "other" object. We'll be using this 6010 // throughout the generated ASTs. 6011 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6012 assert(OtherRef && "Reference to parameter cannot fail!"); 6013 6014 // Construct the "this" pointer. We'll be using this throughout the generated 6015 // ASTs. 6016 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6017 assert(This && "Reference to this cannot fail!"); 6018 6019 // Assign base classes. 6020 bool Invalid = false; 6021 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6022 E = ClassDecl->bases_end(); Base != E; ++Base) { 6023 // Form the assignment: 6024 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6025 QualType BaseType = Base->getType().getUnqualifiedType(); 6026 if (!BaseType->isRecordType()) { 6027 Invalid = true; 6028 continue; 6029 } 6030 6031 CXXCastPath BasePath; 6032 BasePath.push_back(Base); 6033 6034 // Construct the "from" expression, which is an implicit cast to the 6035 // appropriately-qualified base type. 6036 Expr *From = OtherRef; 6037 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6038 CK_UncheckedDerivedToBase, 6039 VK_LValue, &BasePath).take(); 6040 6041 // Dereference "this". 6042 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6043 6044 // Implicitly cast "this" to the appropriately-qualified base type. 6045 To = ImpCastExprToType(To.take(), 6046 Context.getCVRQualifiedType(BaseType, 6047 CopyAssignOperator->getTypeQualifiers()), 6048 CK_UncheckedDerivedToBase, 6049 VK_LValue, &BasePath); 6050 6051 // Build the copy. 6052 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6053 To.get(), From, 6054 /*CopyingBaseSubobject=*/true); 6055 if (Copy.isInvalid()) { 6056 Diag(CurrentLocation, diag::note_member_synthesized_at) 6057 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6058 CopyAssignOperator->setInvalidDecl(); 6059 return; 6060 } 6061 6062 // Success! Record the copy. 6063 Statements.push_back(Copy.takeAs<Expr>()); 6064 } 6065 6066 // \brief Reference to the __builtin_memcpy function. 6067 Expr *BuiltinMemCpyRef = 0; 6068 // \brief Reference to the __builtin_objc_memmove_collectable function. 6069 Expr *CollectableMemCpyRef = 0; 6070 6071 // Assign non-static members. 6072 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6073 FieldEnd = ClassDecl->field_end(); 6074 Field != FieldEnd; ++Field) { 6075 // Check for members of reference type; we can't copy those. 6076 if (Field->getType()->isReferenceType()) { 6077 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6078 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6079 Diag(Field->getLocation(), diag::note_declared_at); 6080 Diag(CurrentLocation, diag::note_member_synthesized_at) 6081 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6082 Invalid = true; 6083 continue; 6084 } 6085 6086 // Check for members of const-qualified, non-class type. 6087 QualType BaseType = Context.getBaseElementType(Field->getType()); 6088 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6089 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6090 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6091 Diag(Field->getLocation(), diag::note_declared_at); 6092 Diag(CurrentLocation, diag::note_member_synthesized_at) 6093 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6094 Invalid = true; 6095 continue; 6096 } 6097 6098 QualType FieldType = Field->getType().getNonReferenceType(); 6099 if (FieldType->isIncompleteArrayType()) { 6100 assert(ClassDecl->hasFlexibleArrayMember() && 6101 "Incomplete array type is not valid"); 6102 continue; 6103 } 6104 6105 // Build references to the field in the object we're copying from and to. 6106 CXXScopeSpec SS; // Intentionally empty 6107 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6108 LookupMemberName); 6109 MemberLookup.addDecl(*Field); 6110 MemberLookup.resolveKind(); 6111 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6112 Loc, /*IsArrow=*/false, 6113 SS, 0, MemberLookup, 0); 6114 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6115 Loc, /*IsArrow=*/true, 6116 SS, 0, MemberLookup, 0); 6117 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6118 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6119 6120 // If the field should be copied with __builtin_memcpy rather than via 6121 // explicit assignments, do so. This optimization only applies for arrays 6122 // of scalars and arrays of class type with trivial copy-assignment 6123 // operators. 6124 if (FieldType->isArrayType() && 6125 (!BaseType->isRecordType() || 6126 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 6127 ->hasTrivialCopyAssignment())) { 6128 // Compute the size of the memory buffer to be copied. 6129 QualType SizeType = Context.getSizeType(); 6130 llvm::APInt Size(Context.getTypeSize(SizeType), 6131 Context.getTypeSizeInChars(BaseType).getQuantity()); 6132 for (const ConstantArrayType *Array 6133 = Context.getAsConstantArrayType(FieldType); 6134 Array; 6135 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6136 llvm::APInt ArraySize 6137 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6138 Size *= ArraySize; 6139 } 6140 6141 // Take the address of the field references for "from" and "to". 6142 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6143 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6144 6145 bool NeedsCollectableMemCpy = 6146 (BaseType->isRecordType() && 6147 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6148 6149 if (NeedsCollectableMemCpy) { 6150 if (!CollectableMemCpyRef) { 6151 // Create a reference to the __builtin_objc_memmove_collectable function. 6152 LookupResult R(*this, 6153 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6154 Loc, LookupOrdinaryName); 6155 LookupName(R, TUScope, true); 6156 6157 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6158 if (!CollectableMemCpy) { 6159 // Something went horribly wrong earlier, and we will have 6160 // complained about it. 6161 Invalid = true; 6162 continue; 6163 } 6164 6165 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6166 CollectableMemCpy->getType(), 6167 VK_LValue, Loc, 0).take(); 6168 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6169 } 6170 } 6171 // Create a reference to the __builtin_memcpy builtin function. 6172 else if (!BuiltinMemCpyRef) { 6173 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6174 LookupOrdinaryName); 6175 LookupName(R, TUScope, true); 6176 6177 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6178 if (!BuiltinMemCpy) { 6179 // Something went horribly wrong earlier, and we will have complained 6180 // about it. 6181 Invalid = true; 6182 continue; 6183 } 6184 6185 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6186 BuiltinMemCpy->getType(), 6187 VK_LValue, Loc, 0).take(); 6188 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6189 } 6190 6191 ASTOwningVector<Expr*> CallArgs(*this); 6192 CallArgs.push_back(To.takeAs<Expr>()); 6193 CallArgs.push_back(From.takeAs<Expr>()); 6194 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6195 ExprResult Call = ExprError(); 6196 if (NeedsCollectableMemCpy) 6197 Call = ActOnCallExpr(/*Scope=*/0, 6198 CollectableMemCpyRef, 6199 Loc, move_arg(CallArgs), 6200 Loc); 6201 else 6202 Call = ActOnCallExpr(/*Scope=*/0, 6203 BuiltinMemCpyRef, 6204 Loc, move_arg(CallArgs), 6205 Loc); 6206 6207 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6208 Statements.push_back(Call.takeAs<Expr>()); 6209 continue; 6210 } 6211 6212 // Build the copy of this field. 6213 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6214 To.get(), From.get(), 6215 /*CopyingBaseSubobject=*/false); 6216 if (Copy.isInvalid()) { 6217 Diag(CurrentLocation, diag::note_member_synthesized_at) 6218 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6219 CopyAssignOperator->setInvalidDecl(); 6220 return; 6221 } 6222 6223 // Success! Record the copy. 6224 Statements.push_back(Copy.takeAs<Stmt>()); 6225 } 6226 6227 if (!Invalid) { 6228 // Add a "return *this;" 6229 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6230 6231 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6232 if (Return.isInvalid()) 6233 Invalid = true; 6234 else { 6235 Statements.push_back(Return.takeAs<Stmt>()); 6236 6237 if (Trap.hasErrorOccurred()) { 6238 Diag(CurrentLocation, diag::note_member_synthesized_at) 6239 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6240 Invalid = true; 6241 } 6242 } 6243 } 6244 6245 if (Invalid) { 6246 CopyAssignOperator->setInvalidDecl(); 6247 return; 6248 } 6249 6250 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6251 /*isStmtExpr=*/false); 6252 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6253 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6254 6255 if (ASTMutationListener *L = getASTMutationListener()) { 6256 L->CompletedImplicitDefinition(CopyAssignOperator); 6257 } 6258} 6259 6260CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 6261 CXXRecordDecl *ClassDecl) { 6262 // C++ [class.copy]p4: 6263 // If the class definition does not explicitly declare a copy 6264 // constructor, one is declared implicitly. 6265 6266 // C++ [class.copy]p5: 6267 // The implicitly-declared copy constructor for a class X will 6268 // have the form 6269 // 6270 // X::X(const X&) 6271 // 6272 // if 6273 bool HasConstCopyConstructor = true; 6274 6275 // -- each direct or virtual base class B of X has a copy 6276 // constructor whose first parameter is of type const B& or 6277 // const volatile B&, and 6278 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6279 BaseEnd = ClassDecl->bases_end(); 6280 HasConstCopyConstructor && Base != BaseEnd; 6281 ++Base) { 6282 // Virtual bases are handled below. 6283 if (Base->isVirtual()) 6284 continue; 6285 6286 CXXRecordDecl *BaseClassDecl 6287 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6288 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6289 DeclareImplicitCopyConstructor(BaseClassDecl); 6290 6291 HasConstCopyConstructor 6292 = BaseClassDecl->hasConstCopyConstructor(Context); 6293 } 6294 6295 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6296 BaseEnd = ClassDecl->vbases_end(); 6297 HasConstCopyConstructor && Base != BaseEnd; 6298 ++Base) { 6299 CXXRecordDecl *BaseClassDecl 6300 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6301 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6302 DeclareImplicitCopyConstructor(BaseClassDecl); 6303 6304 HasConstCopyConstructor 6305 = BaseClassDecl->hasConstCopyConstructor(Context); 6306 } 6307 6308 // -- for all the nonstatic data members of X that are of a 6309 // class type M (or array thereof), each such class type 6310 // has a copy constructor whose first parameter is of type 6311 // const M& or const volatile M&. 6312 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6313 FieldEnd = ClassDecl->field_end(); 6314 HasConstCopyConstructor && Field != FieldEnd; 6315 ++Field) { 6316 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6317 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6318 CXXRecordDecl *FieldClassDecl 6319 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6320 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6321 DeclareImplicitCopyConstructor(FieldClassDecl); 6322 6323 HasConstCopyConstructor 6324 = FieldClassDecl->hasConstCopyConstructor(Context); 6325 } 6326 } 6327 6328 // Otherwise, the implicitly declared copy constructor will have 6329 // the form 6330 // 6331 // X::X(X&) 6332 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6333 QualType ArgType = ClassType; 6334 if (HasConstCopyConstructor) 6335 ArgType = ArgType.withConst(); 6336 ArgType = Context.getLValueReferenceType(ArgType); 6337 6338 // C++ [except.spec]p14: 6339 // An implicitly declared special member function (Clause 12) shall have an 6340 // exception-specification. [...] 6341 ImplicitExceptionSpecification ExceptSpec(Context); 6342 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6343 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6344 BaseEnd = ClassDecl->bases_end(); 6345 Base != BaseEnd; 6346 ++Base) { 6347 // Virtual bases are handled below. 6348 if (Base->isVirtual()) 6349 continue; 6350 6351 CXXRecordDecl *BaseClassDecl 6352 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6353 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6354 DeclareImplicitCopyConstructor(BaseClassDecl); 6355 6356 if (CXXConstructorDecl *CopyConstructor 6357 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6358 ExceptSpec.CalledDecl(CopyConstructor); 6359 } 6360 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6361 BaseEnd = ClassDecl->vbases_end(); 6362 Base != BaseEnd; 6363 ++Base) { 6364 CXXRecordDecl *BaseClassDecl 6365 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6366 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6367 DeclareImplicitCopyConstructor(BaseClassDecl); 6368 6369 if (CXXConstructorDecl *CopyConstructor 6370 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6371 ExceptSpec.CalledDecl(CopyConstructor); 6372 } 6373 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6374 FieldEnd = ClassDecl->field_end(); 6375 Field != FieldEnd; 6376 ++Field) { 6377 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6378 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6379 CXXRecordDecl *FieldClassDecl 6380 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6381 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6382 DeclareImplicitCopyConstructor(FieldClassDecl); 6383 6384 if (CXXConstructorDecl *CopyConstructor 6385 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6386 ExceptSpec.CalledDecl(CopyConstructor); 6387 } 6388 } 6389 6390 // An implicitly-declared copy constructor is an inline public 6391 // member of its class. 6392 FunctionProtoType::ExtProtoInfo EPI; 6393 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6394 EPI.NumExceptions = ExceptSpec.size(); 6395 EPI.Exceptions = ExceptSpec.data(); 6396 DeclarationName Name 6397 = Context.DeclarationNames.getCXXConstructorName( 6398 Context.getCanonicalType(ClassType)); 6399 SourceLocation ClassLoc = ClassDecl->getLocation(); 6400 DeclarationNameInfo NameInfo(Name, ClassLoc); 6401 CXXConstructorDecl *CopyConstructor 6402 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6403 Context.getFunctionType(Context.VoidTy, 6404 &ArgType, 1, EPI), 6405 /*TInfo=*/0, 6406 /*isExplicit=*/false, 6407 /*isInline=*/true, 6408 /*isImplicitlyDeclared=*/true); 6409 CopyConstructor->setAccess(AS_public); 6410 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6411 6412 // Note that we have declared this constructor. 6413 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6414 6415 // Add the parameter to the constructor. 6416 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6417 ClassLoc, ClassLoc, 6418 /*IdentifierInfo=*/0, 6419 ArgType, /*TInfo=*/0, 6420 SC_None, 6421 SC_None, 0); 6422 CopyConstructor->setParams(&FromParam, 1); 6423 if (Scope *S = getScopeForContext(ClassDecl)) 6424 PushOnScopeChains(CopyConstructor, S, false); 6425 ClassDecl->addDecl(CopyConstructor); 6426 6427 return CopyConstructor; 6428} 6429 6430void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6431 CXXConstructorDecl *CopyConstructor, 6432 unsigned TypeQuals) { 6433 assert((CopyConstructor->isImplicit() && 6434 CopyConstructor->isCopyConstructor(TypeQuals) && 6435 !CopyConstructor->isUsed(false)) && 6436 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6437 6438 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6439 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6440 6441 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6442 DiagnosticErrorTrap Trap(Diags); 6443 6444 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6445 Trap.hasErrorOccurred()) { 6446 Diag(CurrentLocation, diag::note_member_synthesized_at) 6447 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6448 CopyConstructor->setInvalidDecl(); 6449 } else { 6450 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6451 CopyConstructor->getLocation(), 6452 MultiStmtArg(*this, 0, 0), 6453 /*isStmtExpr=*/false) 6454 .takeAs<Stmt>()); 6455 } 6456 6457 CopyConstructor->setUsed(); 6458 6459 if (ASTMutationListener *L = getASTMutationListener()) { 6460 L->CompletedImplicitDefinition(CopyConstructor); 6461 } 6462} 6463 6464ExprResult 6465Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6466 CXXConstructorDecl *Constructor, 6467 MultiExprArg ExprArgs, 6468 bool RequiresZeroInit, 6469 unsigned ConstructKind, 6470 SourceRange ParenRange) { 6471 bool Elidable = false; 6472 6473 // C++0x [class.copy]p34: 6474 // When certain criteria are met, an implementation is allowed to 6475 // omit the copy/move construction of a class object, even if the 6476 // copy/move constructor and/or destructor for the object have 6477 // side effects. [...] 6478 // - when a temporary class object that has not been bound to a 6479 // reference (12.2) would be copied/moved to a class object 6480 // with the same cv-unqualified type, the copy/move operation 6481 // can be omitted by constructing the temporary object 6482 // directly into the target of the omitted copy/move 6483 if (ConstructKind == CXXConstructExpr::CK_Complete && 6484 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6485 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6486 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6487 } 6488 6489 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6490 Elidable, move(ExprArgs), RequiresZeroInit, 6491 ConstructKind, ParenRange); 6492} 6493 6494/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6495/// including handling of its default argument expressions. 6496ExprResult 6497Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6498 CXXConstructorDecl *Constructor, bool Elidable, 6499 MultiExprArg ExprArgs, 6500 bool RequiresZeroInit, 6501 unsigned ConstructKind, 6502 SourceRange ParenRange) { 6503 unsigned NumExprs = ExprArgs.size(); 6504 Expr **Exprs = (Expr **)ExprArgs.release(); 6505 6506 for (specific_attr_iterator<NonNullAttr> 6507 i = Constructor->specific_attr_begin<NonNullAttr>(), 6508 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6509 const NonNullAttr *NonNull = *i; 6510 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6511 } 6512 6513 MarkDeclarationReferenced(ConstructLoc, Constructor); 6514 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6515 Constructor, Elidable, Exprs, NumExprs, 6516 RequiresZeroInit, 6517 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6518 ParenRange)); 6519} 6520 6521bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6522 CXXConstructorDecl *Constructor, 6523 MultiExprArg Exprs) { 6524 // FIXME: Provide the correct paren SourceRange when available. 6525 ExprResult TempResult = 6526 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6527 move(Exprs), false, CXXConstructExpr::CK_Complete, 6528 SourceRange()); 6529 if (TempResult.isInvalid()) 6530 return true; 6531 6532 Expr *Temp = TempResult.takeAs<Expr>(); 6533 CheckImplicitConversions(Temp, VD->getLocation()); 6534 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6535 Temp = MaybeCreateExprWithCleanups(Temp); 6536 VD->setInit(Temp); 6537 6538 return false; 6539} 6540 6541void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6542 if (VD->isInvalidDecl()) return; 6543 6544 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6545 if (ClassDecl->isInvalidDecl()) return; 6546 if (ClassDecl->hasTrivialDestructor()) return; 6547 if (ClassDecl->isDependentContext()) return; 6548 6549 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6550 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6551 CheckDestructorAccess(VD->getLocation(), Destructor, 6552 PDiag(diag::err_access_dtor_var) 6553 << VD->getDeclName() 6554 << VD->getType()); 6555 6556 if (!VD->hasGlobalStorage()) return; 6557 6558 // Emit warning for non-trivial dtor in global scope (a real global, 6559 // class-static, function-static). 6560 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6561 6562 // TODO: this should be re-enabled for static locals by !CXAAtExit 6563 if (!VD->isStaticLocal()) 6564 Diag(VD->getLocation(), diag::warn_global_destructor); 6565} 6566 6567/// AddCXXDirectInitializerToDecl - This action is called immediately after 6568/// ActOnDeclarator, when a C++ direct initializer is present. 6569/// e.g: "int x(1);" 6570void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6571 SourceLocation LParenLoc, 6572 MultiExprArg Exprs, 6573 SourceLocation RParenLoc, 6574 bool TypeMayContainAuto) { 6575 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6576 6577 // If there is no declaration, there was an error parsing it. Just ignore 6578 // the initializer. 6579 if (RealDecl == 0) 6580 return; 6581 6582 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6583 if (!VDecl) { 6584 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6585 RealDecl->setInvalidDecl(); 6586 return; 6587 } 6588 6589 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6590 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6591 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6592 if (Exprs.size() > 1) { 6593 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6594 diag::err_auto_var_init_multiple_expressions) 6595 << VDecl->getDeclName() << VDecl->getType() 6596 << VDecl->getSourceRange(); 6597 RealDecl->setInvalidDecl(); 6598 return; 6599 } 6600 6601 Expr *Init = Exprs.get()[0]; 6602 TypeSourceInfo *DeducedType = 0; 6603 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6604 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6605 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6606 << Init->getSourceRange(); 6607 if (!DeducedType) { 6608 RealDecl->setInvalidDecl(); 6609 return; 6610 } 6611 VDecl->setTypeSourceInfo(DeducedType); 6612 VDecl->setType(DeducedType->getType()); 6613 6614 // If this is a redeclaration, check that the type we just deduced matches 6615 // the previously declared type. 6616 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6617 MergeVarDeclTypes(VDecl, Old); 6618 } 6619 6620 // We will represent direct-initialization similarly to copy-initialization: 6621 // int x(1); -as-> int x = 1; 6622 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6623 // 6624 // Clients that want to distinguish between the two forms, can check for 6625 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6626 // A major benefit is that clients that don't particularly care about which 6627 // exactly form was it (like the CodeGen) can handle both cases without 6628 // special case code. 6629 6630 // C++ 8.5p11: 6631 // The form of initialization (using parentheses or '=') is generally 6632 // insignificant, but does matter when the entity being initialized has a 6633 // class type. 6634 6635 if (!VDecl->getType()->isDependentType() && 6636 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6637 diag::err_typecheck_decl_incomplete_type)) { 6638 VDecl->setInvalidDecl(); 6639 return; 6640 } 6641 6642 // The variable can not have an abstract class type. 6643 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6644 diag::err_abstract_type_in_decl, 6645 AbstractVariableType)) 6646 VDecl->setInvalidDecl(); 6647 6648 const VarDecl *Def; 6649 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6650 Diag(VDecl->getLocation(), diag::err_redefinition) 6651 << VDecl->getDeclName(); 6652 Diag(Def->getLocation(), diag::note_previous_definition); 6653 VDecl->setInvalidDecl(); 6654 return; 6655 } 6656 6657 // C++ [class.static.data]p4 6658 // If a static data member is of const integral or const 6659 // enumeration type, its declaration in the class definition can 6660 // specify a constant-initializer which shall be an integral 6661 // constant expression (5.19). In that case, the member can appear 6662 // in integral constant expressions. The member shall still be 6663 // defined in a namespace scope if it is used in the program and the 6664 // namespace scope definition shall not contain an initializer. 6665 // 6666 // We already performed a redefinition check above, but for static 6667 // data members we also need to check whether there was an in-class 6668 // declaration with an initializer. 6669 const VarDecl* PrevInit = 0; 6670 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6671 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6672 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6673 return; 6674 } 6675 6676 bool IsDependent = false; 6677 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6678 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6679 VDecl->setInvalidDecl(); 6680 return; 6681 } 6682 6683 if (Exprs.get()[I]->isTypeDependent()) 6684 IsDependent = true; 6685 } 6686 6687 // If either the declaration has a dependent type or if any of the 6688 // expressions is type-dependent, we represent the initialization 6689 // via a ParenListExpr for later use during template instantiation. 6690 if (VDecl->getType()->isDependentType() || IsDependent) { 6691 // Let clients know that initialization was done with a direct initializer. 6692 VDecl->setCXXDirectInitializer(true); 6693 6694 // Store the initialization expressions as a ParenListExpr. 6695 unsigned NumExprs = Exprs.size(); 6696 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6697 (Expr **)Exprs.release(), 6698 NumExprs, RParenLoc)); 6699 return; 6700 } 6701 6702 // Capture the variable that is being initialized and the style of 6703 // initialization. 6704 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6705 6706 // FIXME: Poor source location information. 6707 InitializationKind Kind 6708 = InitializationKind::CreateDirect(VDecl->getLocation(), 6709 LParenLoc, RParenLoc); 6710 6711 InitializationSequence InitSeq(*this, Entity, Kind, 6712 Exprs.get(), Exprs.size()); 6713 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6714 if (Result.isInvalid()) { 6715 VDecl->setInvalidDecl(); 6716 return; 6717 } 6718 6719 CheckImplicitConversions(Result.get(), LParenLoc); 6720 6721 Result = MaybeCreateExprWithCleanups(Result); 6722 VDecl->setInit(Result.takeAs<Expr>()); 6723 VDecl->setCXXDirectInitializer(true); 6724 6725 CheckCompleteVariableDeclaration(VDecl); 6726} 6727 6728/// \brief Given a constructor and the set of arguments provided for the 6729/// constructor, convert the arguments and add any required default arguments 6730/// to form a proper call to this constructor. 6731/// 6732/// \returns true if an error occurred, false otherwise. 6733bool 6734Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6735 MultiExprArg ArgsPtr, 6736 SourceLocation Loc, 6737 ASTOwningVector<Expr*> &ConvertedArgs) { 6738 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6739 unsigned NumArgs = ArgsPtr.size(); 6740 Expr **Args = (Expr **)ArgsPtr.get(); 6741 6742 const FunctionProtoType *Proto 6743 = Constructor->getType()->getAs<FunctionProtoType>(); 6744 assert(Proto && "Constructor without a prototype?"); 6745 unsigned NumArgsInProto = Proto->getNumArgs(); 6746 6747 // If too few arguments are available, we'll fill in the rest with defaults. 6748 if (NumArgs < NumArgsInProto) 6749 ConvertedArgs.reserve(NumArgsInProto); 6750 else 6751 ConvertedArgs.reserve(NumArgs); 6752 6753 VariadicCallType CallType = 6754 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6755 llvm::SmallVector<Expr *, 8> AllArgs; 6756 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6757 Proto, 0, Args, NumArgs, AllArgs, 6758 CallType); 6759 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6760 ConvertedArgs.push_back(AllArgs[i]); 6761 return Invalid; 6762} 6763 6764static inline bool 6765CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6766 const FunctionDecl *FnDecl) { 6767 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6768 if (isa<NamespaceDecl>(DC)) { 6769 return SemaRef.Diag(FnDecl->getLocation(), 6770 diag::err_operator_new_delete_declared_in_namespace) 6771 << FnDecl->getDeclName(); 6772 } 6773 6774 if (isa<TranslationUnitDecl>(DC) && 6775 FnDecl->getStorageClass() == SC_Static) { 6776 return SemaRef.Diag(FnDecl->getLocation(), 6777 diag::err_operator_new_delete_declared_static) 6778 << FnDecl->getDeclName(); 6779 } 6780 6781 return false; 6782} 6783 6784static inline bool 6785CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6786 CanQualType ExpectedResultType, 6787 CanQualType ExpectedFirstParamType, 6788 unsigned DependentParamTypeDiag, 6789 unsigned InvalidParamTypeDiag) { 6790 QualType ResultType = 6791 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6792 6793 // Check that the result type is not dependent. 6794 if (ResultType->isDependentType()) 6795 return SemaRef.Diag(FnDecl->getLocation(), 6796 diag::err_operator_new_delete_dependent_result_type) 6797 << FnDecl->getDeclName() << ExpectedResultType; 6798 6799 // Check that the result type is what we expect. 6800 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6801 return SemaRef.Diag(FnDecl->getLocation(), 6802 diag::err_operator_new_delete_invalid_result_type) 6803 << FnDecl->getDeclName() << ExpectedResultType; 6804 6805 // A function template must have at least 2 parameters. 6806 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6807 return SemaRef.Diag(FnDecl->getLocation(), 6808 diag::err_operator_new_delete_template_too_few_parameters) 6809 << FnDecl->getDeclName(); 6810 6811 // The function decl must have at least 1 parameter. 6812 if (FnDecl->getNumParams() == 0) 6813 return SemaRef.Diag(FnDecl->getLocation(), 6814 diag::err_operator_new_delete_too_few_parameters) 6815 << FnDecl->getDeclName(); 6816 6817 // Check the the first parameter type is not dependent. 6818 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6819 if (FirstParamType->isDependentType()) 6820 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6821 << FnDecl->getDeclName() << ExpectedFirstParamType; 6822 6823 // Check that the first parameter type is what we expect. 6824 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6825 ExpectedFirstParamType) 6826 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6827 << FnDecl->getDeclName() << ExpectedFirstParamType; 6828 6829 return false; 6830} 6831 6832static bool 6833CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6834 // C++ [basic.stc.dynamic.allocation]p1: 6835 // A program is ill-formed if an allocation function is declared in a 6836 // namespace scope other than global scope or declared static in global 6837 // scope. 6838 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6839 return true; 6840 6841 CanQualType SizeTy = 6842 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6843 6844 // C++ [basic.stc.dynamic.allocation]p1: 6845 // The return type shall be void*. The first parameter shall have type 6846 // std::size_t. 6847 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6848 SizeTy, 6849 diag::err_operator_new_dependent_param_type, 6850 diag::err_operator_new_param_type)) 6851 return true; 6852 6853 // C++ [basic.stc.dynamic.allocation]p1: 6854 // The first parameter shall not have an associated default argument. 6855 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6856 return SemaRef.Diag(FnDecl->getLocation(), 6857 diag::err_operator_new_default_arg) 6858 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6859 6860 return false; 6861} 6862 6863static bool 6864CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6865 // C++ [basic.stc.dynamic.deallocation]p1: 6866 // A program is ill-formed if deallocation functions are declared in a 6867 // namespace scope other than global scope or declared static in global 6868 // scope. 6869 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6870 return true; 6871 6872 // C++ [basic.stc.dynamic.deallocation]p2: 6873 // Each deallocation function shall return void and its first parameter 6874 // shall be void*. 6875 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6876 SemaRef.Context.VoidPtrTy, 6877 diag::err_operator_delete_dependent_param_type, 6878 diag::err_operator_delete_param_type)) 6879 return true; 6880 6881 return false; 6882} 6883 6884/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6885/// of this overloaded operator is well-formed. If so, returns false; 6886/// otherwise, emits appropriate diagnostics and returns true. 6887bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6888 assert(FnDecl && FnDecl->isOverloadedOperator() && 6889 "Expected an overloaded operator declaration"); 6890 6891 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6892 6893 // C++ [over.oper]p5: 6894 // The allocation and deallocation functions, operator new, 6895 // operator new[], operator delete and operator delete[], are 6896 // described completely in 3.7.3. The attributes and restrictions 6897 // found in the rest of this subclause do not apply to them unless 6898 // explicitly stated in 3.7.3. 6899 if (Op == OO_Delete || Op == OO_Array_Delete) 6900 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6901 6902 if (Op == OO_New || Op == OO_Array_New) 6903 return CheckOperatorNewDeclaration(*this, FnDecl); 6904 6905 // C++ [over.oper]p6: 6906 // An operator function shall either be a non-static member 6907 // function or be a non-member function and have at least one 6908 // parameter whose type is a class, a reference to a class, an 6909 // enumeration, or a reference to an enumeration. 6910 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6911 if (MethodDecl->isStatic()) 6912 return Diag(FnDecl->getLocation(), 6913 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6914 } else { 6915 bool ClassOrEnumParam = false; 6916 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6917 ParamEnd = FnDecl->param_end(); 6918 Param != ParamEnd; ++Param) { 6919 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6920 if (ParamType->isDependentType() || ParamType->isRecordType() || 6921 ParamType->isEnumeralType()) { 6922 ClassOrEnumParam = true; 6923 break; 6924 } 6925 } 6926 6927 if (!ClassOrEnumParam) 6928 return Diag(FnDecl->getLocation(), 6929 diag::err_operator_overload_needs_class_or_enum) 6930 << FnDecl->getDeclName(); 6931 } 6932 6933 // C++ [over.oper]p8: 6934 // An operator function cannot have default arguments (8.3.6), 6935 // except where explicitly stated below. 6936 // 6937 // Only the function-call operator allows default arguments 6938 // (C++ [over.call]p1). 6939 if (Op != OO_Call) { 6940 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6941 Param != FnDecl->param_end(); ++Param) { 6942 if ((*Param)->hasDefaultArg()) 6943 return Diag((*Param)->getLocation(), 6944 diag::err_operator_overload_default_arg) 6945 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6946 } 6947 } 6948 6949 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6950 { false, false, false } 6951#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6952 , { Unary, Binary, MemberOnly } 6953#include "clang/Basic/OperatorKinds.def" 6954 }; 6955 6956 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6957 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6958 bool MustBeMemberOperator = OperatorUses[Op][2]; 6959 6960 // C++ [over.oper]p8: 6961 // [...] Operator functions cannot have more or fewer parameters 6962 // than the number required for the corresponding operator, as 6963 // described in the rest of this subclause. 6964 unsigned NumParams = FnDecl->getNumParams() 6965 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6966 if (Op != OO_Call && 6967 ((NumParams == 1 && !CanBeUnaryOperator) || 6968 (NumParams == 2 && !CanBeBinaryOperator) || 6969 (NumParams < 1) || (NumParams > 2))) { 6970 // We have the wrong number of parameters. 6971 unsigned ErrorKind; 6972 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6973 ErrorKind = 2; // 2 -> unary or binary. 6974 } else if (CanBeUnaryOperator) { 6975 ErrorKind = 0; // 0 -> unary 6976 } else { 6977 assert(CanBeBinaryOperator && 6978 "All non-call overloaded operators are unary or binary!"); 6979 ErrorKind = 1; // 1 -> binary 6980 } 6981 6982 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6983 << FnDecl->getDeclName() << NumParams << ErrorKind; 6984 } 6985 6986 // Overloaded operators other than operator() cannot be variadic. 6987 if (Op != OO_Call && 6988 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6989 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6990 << FnDecl->getDeclName(); 6991 } 6992 6993 // Some operators must be non-static member functions. 6994 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6995 return Diag(FnDecl->getLocation(), 6996 diag::err_operator_overload_must_be_member) 6997 << FnDecl->getDeclName(); 6998 } 6999 7000 // C++ [over.inc]p1: 7001 // The user-defined function called operator++ implements the 7002 // prefix and postfix ++ operator. If this function is a member 7003 // function with no parameters, or a non-member function with one 7004 // parameter of class or enumeration type, it defines the prefix 7005 // increment operator ++ for objects of that type. If the function 7006 // is a member function with one parameter (which shall be of type 7007 // int) or a non-member function with two parameters (the second 7008 // of which shall be of type int), it defines the postfix 7009 // increment operator ++ for objects of that type. 7010 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7011 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7012 bool ParamIsInt = false; 7013 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7014 ParamIsInt = BT->getKind() == BuiltinType::Int; 7015 7016 if (!ParamIsInt) 7017 return Diag(LastParam->getLocation(), 7018 diag::err_operator_overload_post_incdec_must_be_int) 7019 << LastParam->getType() << (Op == OO_MinusMinus); 7020 } 7021 7022 return false; 7023} 7024 7025/// CheckLiteralOperatorDeclaration - Check whether the declaration 7026/// of this literal operator function is well-formed. If so, returns 7027/// false; otherwise, emits appropriate diagnostics and returns true. 7028bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7029 DeclContext *DC = FnDecl->getDeclContext(); 7030 Decl::Kind Kind = DC->getDeclKind(); 7031 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7032 Kind != Decl::LinkageSpec) { 7033 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7034 << FnDecl->getDeclName(); 7035 return true; 7036 } 7037 7038 bool Valid = false; 7039 7040 // template <char...> type operator "" name() is the only valid template 7041 // signature, and the only valid signature with no parameters. 7042 if (FnDecl->param_size() == 0) { 7043 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7044 // Must have only one template parameter 7045 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7046 if (Params->size() == 1) { 7047 NonTypeTemplateParmDecl *PmDecl = 7048 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7049 7050 // The template parameter must be a char parameter pack. 7051 if (PmDecl && PmDecl->isTemplateParameterPack() && 7052 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7053 Valid = true; 7054 } 7055 } 7056 } else { 7057 // Check the first parameter 7058 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7059 7060 QualType T = (*Param)->getType(); 7061 7062 // unsigned long long int, long double, and any character type are allowed 7063 // as the only parameters. 7064 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7065 Context.hasSameType(T, Context.LongDoubleTy) || 7066 Context.hasSameType(T, Context.CharTy) || 7067 Context.hasSameType(T, Context.WCharTy) || 7068 Context.hasSameType(T, Context.Char16Ty) || 7069 Context.hasSameType(T, Context.Char32Ty)) { 7070 if (++Param == FnDecl->param_end()) 7071 Valid = true; 7072 goto FinishedParams; 7073 } 7074 7075 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7076 const PointerType *PT = T->getAs<PointerType>(); 7077 if (!PT) 7078 goto FinishedParams; 7079 T = PT->getPointeeType(); 7080 if (!T.isConstQualified()) 7081 goto FinishedParams; 7082 T = T.getUnqualifiedType(); 7083 7084 // Move on to the second parameter; 7085 ++Param; 7086 7087 // If there is no second parameter, the first must be a const char * 7088 if (Param == FnDecl->param_end()) { 7089 if (Context.hasSameType(T, Context.CharTy)) 7090 Valid = true; 7091 goto FinishedParams; 7092 } 7093 7094 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7095 // are allowed as the first parameter to a two-parameter function 7096 if (!(Context.hasSameType(T, Context.CharTy) || 7097 Context.hasSameType(T, Context.WCharTy) || 7098 Context.hasSameType(T, Context.Char16Ty) || 7099 Context.hasSameType(T, Context.Char32Ty))) 7100 goto FinishedParams; 7101 7102 // The second and final parameter must be an std::size_t 7103 T = (*Param)->getType().getUnqualifiedType(); 7104 if (Context.hasSameType(T, Context.getSizeType()) && 7105 ++Param == FnDecl->param_end()) 7106 Valid = true; 7107 } 7108 7109 // FIXME: This diagnostic is absolutely terrible. 7110FinishedParams: 7111 if (!Valid) { 7112 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7113 << FnDecl->getDeclName(); 7114 return true; 7115 } 7116 7117 return false; 7118} 7119 7120/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7121/// linkage specification, including the language and (if present) 7122/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7123/// the location of the language string literal, which is provided 7124/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7125/// the '{' brace. Otherwise, this linkage specification does not 7126/// have any braces. 7127Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7128 SourceLocation LangLoc, 7129 llvm::StringRef Lang, 7130 SourceLocation LBraceLoc) { 7131 LinkageSpecDecl::LanguageIDs Language; 7132 if (Lang == "\"C\"") 7133 Language = LinkageSpecDecl::lang_c; 7134 else if (Lang == "\"C++\"") 7135 Language = LinkageSpecDecl::lang_cxx; 7136 else { 7137 Diag(LangLoc, diag::err_bad_language); 7138 return 0; 7139 } 7140 7141 // FIXME: Add all the various semantics of linkage specifications 7142 7143 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7144 ExternLoc, LangLoc, Language); 7145 CurContext->addDecl(D); 7146 PushDeclContext(S, D); 7147 return D; 7148} 7149 7150/// ActOnFinishLinkageSpecification - Complete the definition of 7151/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7152/// valid, it's the position of the closing '}' brace in a linkage 7153/// specification that uses braces. 7154Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7155 Decl *LinkageSpec, 7156 SourceLocation RBraceLoc) { 7157 if (LinkageSpec) { 7158 if (RBraceLoc.isValid()) { 7159 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7160 LSDecl->setRBraceLoc(RBraceLoc); 7161 } 7162 PopDeclContext(); 7163 } 7164 return LinkageSpec; 7165} 7166 7167/// \brief Perform semantic analysis for the variable declaration that 7168/// occurs within a C++ catch clause, returning the newly-created 7169/// variable. 7170VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7171 TypeSourceInfo *TInfo, 7172 SourceLocation StartLoc, 7173 SourceLocation Loc, 7174 IdentifierInfo *Name) { 7175 bool Invalid = false; 7176 QualType ExDeclType = TInfo->getType(); 7177 7178 // Arrays and functions decay. 7179 if (ExDeclType->isArrayType()) 7180 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7181 else if (ExDeclType->isFunctionType()) 7182 ExDeclType = Context.getPointerType(ExDeclType); 7183 7184 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7185 // The exception-declaration shall not denote a pointer or reference to an 7186 // incomplete type, other than [cv] void*. 7187 // N2844 forbids rvalue references. 7188 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7189 Diag(Loc, diag::err_catch_rvalue_ref); 7190 Invalid = true; 7191 } 7192 7193 // GCC allows catching pointers and references to incomplete types 7194 // as an extension; so do we, but we warn by default. 7195 7196 QualType BaseType = ExDeclType; 7197 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7198 unsigned DK = diag::err_catch_incomplete; 7199 bool IncompleteCatchIsInvalid = true; 7200 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7201 BaseType = Ptr->getPointeeType(); 7202 Mode = 1; 7203 DK = diag::ext_catch_incomplete_ptr; 7204 IncompleteCatchIsInvalid = false; 7205 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7206 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7207 BaseType = Ref->getPointeeType(); 7208 Mode = 2; 7209 DK = diag::ext_catch_incomplete_ref; 7210 IncompleteCatchIsInvalid = false; 7211 } 7212 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7213 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7214 IncompleteCatchIsInvalid) 7215 Invalid = true; 7216 7217 if (!Invalid && !ExDeclType->isDependentType() && 7218 RequireNonAbstractType(Loc, ExDeclType, 7219 diag::err_abstract_type_in_decl, 7220 AbstractVariableType)) 7221 Invalid = true; 7222 7223 // Only the non-fragile NeXT runtime currently supports C++ catches 7224 // of ObjC types, and no runtime supports catching ObjC types by value. 7225 if (!Invalid && getLangOptions().ObjC1) { 7226 QualType T = ExDeclType; 7227 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7228 T = RT->getPointeeType(); 7229 7230 if (T->isObjCObjectType()) { 7231 Diag(Loc, diag::err_objc_object_catch); 7232 Invalid = true; 7233 } else if (T->isObjCObjectPointerType()) { 7234 if (!getLangOptions().ObjCNonFragileABI) { 7235 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7236 Invalid = true; 7237 } 7238 } 7239 } 7240 7241 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7242 ExDeclType, TInfo, SC_None, SC_None); 7243 ExDecl->setExceptionVariable(true); 7244 7245 if (!Invalid) { 7246 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7247 // C++ [except.handle]p16: 7248 // The object declared in an exception-declaration or, if the 7249 // exception-declaration does not specify a name, a temporary (12.2) is 7250 // copy-initialized (8.5) from the exception object. [...] 7251 // The object is destroyed when the handler exits, after the destruction 7252 // of any automatic objects initialized within the handler. 7253 // 7254 // We just pretend to initialize the object with itself, then make sure 7255 // it can be destroyed later. 7256 QualType initType = ExDeclType; 7257 7258 InitializedEntity entity = 7259 InitializedEntity::InitializeVariable(ExDecl); 7260 InitializationKind initKind = 7261 InitializationKind::CreateCopy(Loc, SourceLocation()); 7262 7263 Expr *opaqueValue = 7264 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 7265 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 7266 ExprResult result = sequence.Perform(*this, entity, initKind, 7267 MultiExprArg(&opaqueValue, 1)); 7268 if (result.isInvalid()) 7269 Invalid = true; 7270 else { 7271 // If the constructor used was non-trivial, set this as the 7272 // "initializer". 7273 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 7274 if (!construct->getConstructor()->isTrivial()) { 7275 Expr *init = MaybeCreateExprWithCleanups(construct); 7276 ExDecl->setInit(init); 7277 } 7278 7279 // And make sure it's destructable. 7280 FinalizeVarWithDestructor(ExDecl, recordType); 7281 } 7282 } 7283 } 7284 7285 if (Invalid) 7286 ExDecl->setInvalidDecl(); 7287 7288 return ExDecl; 7289} 7290 7291/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7292/// handler. 7293Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7294 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7295 bool Invalid = D.isInvalidType(); 7296 7297 // Check for unexpanded parameter packs. 7298 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7299 UPPC_ExceptionType)) { 7300 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7301 D.getIdentifierLoc()); 7302 Invalid = true; 7303 } 7304 7305 IdentifierInfo *II = D.getIdentifier(); 7306 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7307 LookupOrdinaryName, 7308 ForRedeclaration)) { 7309 // The scope should be freshly made just for us. There is just no way 7310 // it contains any previous declaration. 7311 assert(!S->isDeclScope(PrevDecl)); 7312 if (PrevDecl->isTemplateParameter()) { 7313 // Maybe we will complain about the shadowed template parameter. 7314 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7315 } 7316 } 7317 7318 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7319 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7320 << D.getCXXScopeSpec().getRange(); 7321 Invalid = true; 7322 } 7323 7324 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7325 D.getSourceRange().getBegin(), 7326 D.getIdentifierLoc(), 7327 D.getIdentifier()); 7328 if (Invalid) 7329 ExDecl->setInvalidDecl(); 7330 7331 // Add the exception declaration into this scope. 7332 if (II) 7333 PushOnScopeChains(ExDecl, S); 7334 else 7335 CurContext->addDecl(ExDecl); 7336 7337 ProcessDeclAttributes(S, ExDecl, D); 7338 return ExDecl; 7339} 7340 7341Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7342 Expr *AssertExpr, 7343 Expr *AssertMessageExpr_, 7344 SourceLocation RParenLoc) { 7345 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7346 7347 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7348 llvm::APSInt Value(32); 7349 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7350 Diag(StaticAssertLoc, 7351 diag::err_static_assert_expression_is_not_constant) << 7352 AssertExpr->getSourceRange(); 7353 return 0; 7354 } 7355 7356 if (Value == 0) { 7357 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7358 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7359 } 7360 } 7361 7362 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7363 return 0; 7364 7365 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7366 AssertExpr, AssertMessage, RParenLoc); 7367 7368 CurContext->addDecl(Decl); 7369 return Decl; 7370} 7371 7372/// \brief Perform semantic analysis of the given friend type declaration. 7373/// 7374/// \returns A friend declaration that. 7375FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7376 TypeSourceInfo *TSInfo) { 7377 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7378 7379 QualType T = TSInfo->getType(); 7380 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7381 7382 if (!getLangOptions().CPlusPlus0x) { 7383 // C++03 [class.friend]p2: 7384 // An elaborated-type-specifier shall be used in a friend declaration 7385 // for a class.* 7386 // 7387 // * The class-key of the elaborated-type-specifier is required. 7388 if (!ActiveTemplateInstantiations.empty()) { 7389 // Do not complain about the form of friend template types during 7390 // template instantiation; we will already have complained when the 7391 // template was declared. 7392 } else if (!T->isElaboratedTypeSpecifier()) { 7393 // If we evaluated the type to a record type, suggest putting 7394 // a tag in front. 7395 if (const RecordType *RT = T->getAs<RecordType>()) { 7396 RecordDecl *RD = RT->getDecl(); 7397 7398 std::string InsertionText = std::string(" ") + RD->getKindName(); 7399 7400 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7401 << (unsigned) RD->getTagKind() 7402 << T 7403 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7404 InsertionText); 7405 } else { 7406 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7407 << T 7408 << SourceRange(FriendLoc, TypeRange.getEnd()); 7409 } 7410 } else if (T->getAs<EnumType>()) { 7411 Diag(FriendLoc, diag::ext_enum_friend) 7412 << T 7413 << SourceRange(FriendLoc, TypeRange.getEnd()); 7414 } 7415 } 7416 7417 // C++0x [class.friend]p3: 7418 // If the type specifier in a friend declaration designates a (possibly 7419 // cv-qualified) class type, that class is declared as a friend; otherwise, 7420 // the friend declaration is ignored. 7421 7422 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7423 // in [class.friend]p3 that we do not implement. 7424 7425 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7426} 7427 7428/// Handle a friend tag declaration where the scope specifier was 7429/// templated. 7430Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7431 unsigned TagSpec, SourceLocation TagLoc, 7432 CXXScopeSpec &SS, 7433 IdentifierInfo *Name, SourceLocation NameLoc, 7434 AttributeList *Attr, 7435 MultiTemplateParamsArg TempParamLists) { 7436 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7437 7438 bool isExplicitSpecialization = false; 7439 bool Invalid = false; 7440 7441 if (TemplateParameterList *TemplateParams 7442 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 7443 TempParamLists.get(), 7444 TempParamLists.size(), 7445 /*friend*/ true, 7446 isExplicitSpecialization, 7447 Invalid)) { 7448 if (TemplateParams->size() > 0) { 7449 // This is a declaration of a class template. 7450 if (Invalid) 7451 return 0; 7452 7453 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7454 SS, Name, NameLoc, Attr, 7455 TemplateParams, AS_public, 7456 TempParamLists.size() - 1, 7457 (TemplateParameterList**) TempParamLists.release()).take(); 7458 } else { 7459 // The "template<>" header is extraneous. 7460 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7461 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7462 isExplicitSpecialization = true; 7463 } 7464 } 7465 7466 if (Invalid) return 0; 7467 7468 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7469 7470 bool isAllExplicitSpecializations = true; 7471 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7472 if (TempParamLists.get()[I]->size()) { 7473 isAllExplicitSpecializations = false; 7474 break; 7475 } 7476 } 7477 7478 // FIXME: don't ignore attributes. 7479 7480 // If it's explicit specializations all the way down, just forget 7481 // about the template header and build an appropriate non-templated 7482 // friend. TODO: for source fidelity, remember the headers. 7483 if (isAllExplicitSpecializations) { 7484 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7485 ElaboratedTypeKeyword Keyword 7486 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7487 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7488 *Name, NameLoc); 7489 if (T.isNull()) 7490 return 0; 7491 7492 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7493 if (isa<DependentNameType>(T)) { 7494 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7495 TL.setKeywordLoc(TagLoc); 7496 TL.setQualifierLoc(QualifierLoc); 7497 TL.setNameLoc(NameLoc); 7498 } else { 7499 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7500 TL.setKeywordLoc(TagLoc); 7501 TL.setQualifierLoc(QualifierLoc); 7502 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7503 } 7504 7505 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7506 TSI, FriendLoc); 7507 Friend->setAccess(AS_public); 7508 CurContext->addDecl(Friend); 7509 return Friend; 7510 } 7511 7512 // Handle the case of a templated-scope friend class. e.g. 7513 // template <class T> class A<T>::B; 7514 // FIXME: we don't support these right now. 7515 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7516 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7517 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7518 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7519 TL.setKeywordLoc(TagLoc); 7520 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7521 TL.setNameLoc(NameLoc); 7522 7523 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7524 TSI, FriendLoc); 7525 Friend->setAccess(AS_public); 7526 Friend->setUnsupportedFriend(true); 7527 CurContext->addDecl(Friend); 7528 return Friend; 7529} 7530 7531 7532/// Handle a friend type declaration. This works in tandem with 7533/// ActOnTag. 7534/// 7535/// Notes on friend class templates: 7536/// 7537/// We generally treat friend class declarations as if they were 7538/// declaring a class. So, for example, the elaborated type specifier 7539/// in a friend declaration is required to obey the restrictions of a 7540/// class-head (i.e. no typedefs in the scope chain), template 7541/// parameters are required to match up with simple template-ids, &c. 7542/// However, unlike when declaring a template specialization, it's 7543/// okay to refer to a template specialization without an empty 7544/// template parameter declaration, e.g. 7545/// friend class A<T>::B<unsigned>; 7546/// We permit this as a special case; if there are any template 7547/// parameters present at all, require proper matching, i.e. 7548/// template <> template <class T> friend class A<int>::B; 7549Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7550 MultiTemplateParamsArg TempParams) { 7551 SourceLocation Loc = DS.getSourceRange().getBegin(); 7552 7553 assert(DS.isFriendSpecified()); 7554 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7555 7556 // Try to convert the decl specifier to a type. This works for 7557 // friend templates because ActOnTag never produces a ClassTemplateDecl 7558 // for a TUK_Friend. 7559 Declarator TheDeclarator(DS, Declarator::MemberContext); 7560 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7561 QualType T = TSI->getType(); 7562 if (TheDeclarator.isInvalidType()) 7563 return 0; 7564 7565 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7566 return 0; 7567 7568 // This is definitely an error in C++98. It's probably meant to 7569 // be forbidden in C++0x, too, but the specification is just 7570 // poorly written. 7571 // 7572 // The problem is with declarations like the following: 7573 // template <T> friend A<T>::foo; 7574 // where deciding whether a class C is a friend or not now hinges 7575 // on whether there exists an instantiation of A that causes 7576 // 'foo' to equal C. There are restrictions on class-heads 7577 // (which we declare (by fiat) elaborated friend declarations to 7578 // be) that makes this tractable. 7579 // 7580 // FIXME: handle "template <> friend class A<T>;", which 7581 // is possibly well-formed? Who even knows? 7582 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7583 Diag(Loc, diag::err_tagless_friend_type_template) 7584 << DS.getSourceRange(); 7585 return 0; 7586 } 7587 7588 // C++98 [class.friend]p1: A friend of a class is a function 7589 // or class that is not a member of the class . . . 7590 // This is fixed in DR77, which just barely didn't make the C++03 7591 // deadline. It's also a very silly restriction that seriously 7592 // affects inner classes and which nobody else seems to implement; 7593 // thus we never diagnose it, not even in -pedantic. 7594 // 7595 // But note that we could warn about it: it's always useless to 7596 // friend one of your own members (it's not, however, worthless to 7597 // friend a member of an arbitrary specialization of your template). 7598 7599 Decl *D; 7600 if (unsigned NumTempParamLists = TempParams.size()) 7601 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7602 NumTempParamLists, 7603 TempParams.release(), 7604 TSI, 7605 DS.getFriendSpecLoc()); 7606 else 7607 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7608 7609 if (!D) 7610 return 0; 7611 7612 D->setAccess(AS_public); 7613 CurContext->addDecl(D); 7614 7615 return D; 7616} 7617 7618Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7619 MultiTemplateParamsArg TemplateParams) { 7620 const DeclSpec &DS = D.getDeclSpec(); 7621 7622 assert(DS.isFriendSpecified()); 7623 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7624 7625 SourceLocation Loc = D.getIdentifierLoc(); 7626 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7627 QualType T = TInfo->getType(); 7628 7629 // C++ [class.friend]p1 7630 // A friend of a class is a function or class.... 7631 // Note that this sees through typedefs, which is intended. 7632 // It *doesn't* see through dependent types, which is correct 7633 // according to [temp.arg.type]p3: 7634 // If a declaration acquires a function type through a 7635 // type dependent on a template-parameter and this causes 7636 // a declaration that does not use the syntactic form of a 7637 // function declarator to have a function type, the program 7638 // is ill-formed. 7639 if (!T->isFunctionType()) { 7640 Diag(Loc, diag::err_unexpected_friend); 7641 7642 // It might be worthwhile to try to recover by creating an 7643 // appropriate declaration. 7644 return 0; 7645 } 7646 7647 // C++ [namespace.memdef]p3 7648 // - If a friend declaration in a non-local class first declares a 7649 // class or function, the friend class or function is a member 7650 // of the innermost enclosing namespace. 7651 // - The name of the friend is not found by simple name lookup 7652 // until a matching declaration is provided in that namespace 7653 // scope (either before or after the class declaration granting 7654 // friendship). 7655 // - If a friend function is called, its name may be found by the 7656 // name lookup that considers functions from namespaces and 7657 // classes associated with the types of the function arguments. 7658 // - When looking for a prior declaration of a class or a function 7659 // declared as a friend, scopes outside the innermost enclosing 7660 // namespace scope are not considered. 7661 7662 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7663 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7664 DeclarationName Name = NameInfo.getName(); 7665 assert(Name); 7666 7667 // Check for unexpanded parameter packs. 7668 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7669 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7670 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7671 return 0; 7672 7673 // The context we found the declaration in, or in which we should 7674 // create the declaration. 7675 DeclContext *DC; 7676 Scope *DCScope = S; 7677 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7678 ForRedeclaration); 7679 7680 // FIXME: there are different rules in local classes 7681 7682 // There are four cases here. 7683 // - There's no scope specifier, in which case we just go to the 7684 // appropriate scope and look for a function or function template 7685 // there as appropriate. 7686 // Recover from invalid scope qualifiers as if they just weren't there. 7687 if (SS.isInvalid() || !SS.isSet()) { 7688 // C++0x [namespace.memdef]p3: 7689 // If the name in a friend declaration is neither qualified nor 7690 // a template-id and the declaration is a function or an 7691 // elaborated-type-specifier, the lookup to determine whether 7692 // the entity has been previously declared shall not consider 7693 // any scopes outside the innermost enclosing namespace. 7694 // C++0x [class.friend]p11: 7695 // If a friend declaration appears in a local class and the name 7696 // specified is an unqualified name, a prior declaration is 7697 // looked up without considering scopes that are outside the 7698 // innermost enclosing non-class scope. For a friend function 7699 // declaration, if there is no prior declaration, the program is 7700 // ill-formed. 7701 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7702 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7703 7704 // Find the appropriate context according to the above. 7705 DC = CurContext; 7706 while (true) { 7707 // Skip class contexts. If someone can cite chapter and verse 7708 // for this behavior, that would be nice --- it's what GCC and 7709 // EDG do, and it seems like a reasonable intent, but the spec 7710 // really only says that checks for unqualified existing 7711 // declarations should stop at the nearest enclosing namespace, 7712 // not that they should only consider the nearest enclosing 7713 // namespace. 7714 while (DC->isRecord()) 7715 DC = DC->getParent(); 7716 7717 LookupQualifiedName(Previous, DC); 7718 7719 // TODO: decide what we think about using declarations. 7720 if (isLocal || !Previous.empty()) 7721 break; 7722 7723 if (isTemplateId) { 7724 if (isa<TranslationUnitDecl>(DC)) break; 7725 } else { 7726 if (DC->isFileContext()) break; 7727 } 7728 DC = DC->getParent(); 7729 } 7730 7731 // C++ [class.friend]p1: A friend of a class is a function or 7732 // class that is not a member of the class . . . 7733 // C++0x changes this for both friend types and functions. 7734 // Most C++ 98 compilers do seem to give an error here, so 7735 // we do, too. 7736 if (!Previous.empty() && DC->Equals(CurContext) 7737 && !getLangOptions().CPlusPlus0x) 7738 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7739 7740 DCScope = getScopeForDeclContext(S, DC); 7741 7742 // - There's a non-dependent scope specifier, in which case we 7743 // compute it and do a previous lookup there for a function 7744 // or function template. 7745 } else if (!SS.getScopeRep()->isDependent()) { 7746 DC = computeDeclContext(SS); 7747 if (!DC) return 0; 7748 7749 if (RequireCompleteDeclContext(SS, DC)) return 0; 7750 7751 LookupQualifiedName(Previous, DC); 7752 7753 // Ignore things found implicitly in the wrong scope. 7754 // TODO: better diagnostics for this case. Suggesting the right 7755 // qualified scope would be nice... 7756 LookupResult::Filter F = Previous.makeFilter(); 7757 while (F.hasNext()) { 7758 NamedDecl *D = F.next(); 7759 if (!DC->InEnclosingNamespaceSetOf( 7760 D->getDeclContext()->getRedeclContext())) 7761 F.erase(); 7762 } 7763 F.done(); 7764 7765 if (Previous.empty()) { 7766 D.setInvalidType(); 7767 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7768 return 0; 7769 } 7770 7771 // C++ [class.friend]p1: A friend of a class is a function or 7772 // class that is not a member of the class . . . 7773 if (DC->Equals(CurContext)) 7774 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7775 7776 // - There's a scope specifier that does not match any template 7777 // parameter lists, in which case we use some arbitrary context, 7778 // create a method or method template, and wait for instantiation. 7779 // - There's a scope specifier that does match some template 7780 // parameter lists, which we don't handle right now. 7781 } else { 7782 DC = CurContext; 7783 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7784 } 7785 7786 if (!DC->isRecord()) { 7787 // This implies that it has to be an operator or function. 7788 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7789 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7790 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7791 Diag(Loc, diag::err_introducing_special_friend) << 7792 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7793 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7794 return 0; 7795 } 7796 } 7797 7798 bool Redeclaration = false; 7799 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7800 move(TemplateParams), 7801 IsDefinition, 7802 Redeclaration); 7803 if (!ND) return 0; 7804 7805 assert(ND->getDeclContext() == DC); 7806 assert(ND->getLexicalDeclContext() == CurContext); 7807 7808 // Add the function declaration to the appropriate lookup tables, 7809 // adjusting the redeclarations list as necessary. We don't 7810 // want to do this yet if the friending class is dependent. 7811 // 7812 // Also update the scope-based lookup if the target context's 7813 // lookup context is in lexical scope. 7814 if (!CurContext->isDependentContext()) { 7815 DC = DC->getRedeclContext(); 7816 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7817 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7818 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7819 } 7820 7821 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7822 D.getIdentifierLoc(), ND, 7823 DS.getFriendSpecLoc()); 7824 FrD->setAccess(AS_public); 7825 CurContext->addDecl(FrD); 7826 7827 if (ND->isInvalidDecl()) 7828 FrD->setInvalidDecl(); 7829 else { 7830 FunctionDecl *FD; 7831 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7832 FD = FTD->getTemplatedDecl(); 7833 else 7834 FD = cast<FunctionDecl>(ND); 7835 7836 // Mark templated-scope function declarations as unsupported. 7837 if (FD->getNumTemplateParameterLists()) 7838 FrD->setUnsupportedFriend(true); 7839 } 7840 7841 return ND; 7842} 7843 7844void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7845 AdjustDeclIfTemplate(Dcl); 7846 7847 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7848 if (!Fn) { 7849 Diag(DelLoc, diag::err_deleted_non_function); 7850 return; 7851 } 7852 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7853 Diag(DelLoc, diag::err_deleted_decl_not_first); 7854 Diag(Prev->getLocation(), diag::note_previous_declaration); 7855 // If the declaration wasn't the first, we delete the function anyway for 7856 // recovery. 7857 } 7858 Fn->setDeletedAsWritten(); 7859} 7860 7861void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 7862 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 7863 7864 if (MD) { 7865 CXXSpecialMember Member = getSpecialMember(MD); 7866 if (Member == CXXInvalid) { 7867 Diag(DefaultLoc, diag::err_default_special_members); 7868 return; 7869 } 7870 7871 MD->setDefaulted(); 7872 MD->setExplicitlyDefaulted(); 7873 7874 // We'll check it when the record is done 7875 if (MD == MD->getCanonicalDecl()) 7876 return; 7877 7878 switch (Member) { 7879 case CXXDefaultConstructor: { 7880 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 7881 CheckExplicitlyDefaultedDefaultConstructor(CD); 7882 DefineImplicitDefaultConstructor(DefaultLoc, CD); 7883 break; 7884 } 7885 default: 7886 // FIXME: Do the rest once we have functions 7887 break; 7888 } 7889 } else { 7890 Diag(DefaultLoc, diag::err_default_special_members); 7891 } 7892} 7893 7894static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7895 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7896 Stmt *SubStmt = *CI; 7897 if (!SubStmt) 7898 continue; 7899 if (isa<ReturnStmt>(SubStmt)) 7900 Self.Diag(SubStmt->getSourceRange().getBegin(), 7901 diag::err_return_in_constructor_handler); 7902 if (!isa<Expr>(SubStmt)) 7903 SearchForReturnInStmt(Self, SubStmt); 7904 } 7905} 7906 7907void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7908 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7909 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7910 SearchForReturnInStmt(*this, Handler); 7911 } 7912} 7913 7914bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7915 const CXXMethodDecl *Old) { 7916 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7917 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7918 7919 if (Context.hasSameType(NewTy, OldTy) || 7920 NewTy->isDependentType() || OldTy->isDependentType()) 7921 return false; 7922 7923 // Check if the return types are covariant 7924 QualType NewClassTy, OldClassTy; 7925 7926 /// Both types must be pointers or references to classes. 7927 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7928 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7929 NewClassTy = NewPT->getPointeeType(); 7930 OldClassTy = OldPT->getPointeeType(); 7931 } 7932 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7933 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7934 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7935 NewClassTy = NewRT->getPointeeType(); 7936 OldClassTy = OldRT->getPointeeType(); 7937 } 7938 } 7939 } 7940 7941 // The return types aren't either both pointers or references to a class type. 7942 if (NewClassTy.isNull()) { 7943 Diag(New->getLocation(), 7944 diag::err_different_return_type_for_overriding_virtual_function) 7945 << New->getDeclName() << NewTy << OldTy; 7946 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7947 7948 return true; 7949 } 7950 7951 // C++ [class.virtual]p6: 7952 // If the return type of D::f differs from the return type of B::f, the 7953 // class type in the return type of D::f shall be complete at the point of 7954 // declaration of D::f or shall be the class type D. 7955 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7956 if (!RT->isBeingDefined() && 7957 RequireCompleteType(New->getLocation(), NewClassTy, 7958 PDiag(diag::err_covariant_return_incomplete) 7959 << New->getDeclName())) 7960 return true; 7961 } 7962 7963 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7964 // Check if the new class derives from the old class. 7965 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7966 Diag(New->getLocation(), 7967 diag::err_covariant_return_not_derived) 7968 << New->getDeclName() << NewTy << OldTy; 7969 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7970 return true; 7971 } 7972 7973 // Check if we the conversion from derived to base is valid. 7974 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7975 diag::err_covariant_return_inaccessible_base, 7976 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7977 // FIXME: Should this point to the return type? 7978 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7979 // FIXME: this note won't trigger for delayed access control 7980 // diagnostics, and it's impossible to get an undelayed error 7981 // here from access control during the original parse because 7982 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7983 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7984 return true; 7985 } 7986 } 7987 7988 // The qualifiers of the return types must be the same. 7989 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7990 Diag(New->getLocation(), 7991 diag::err_covariant_return_type_different_qualifications) 7992 << New->getDeclName() << NewTy << OldTy; 7993 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7994 return true; 7995 }; 7996 7997 7998 // The new class type must have the same or less qualifiers as the old type. 7999 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8000 Diag(New->getLocation(), 8001 diag::err_covariant_return_type_class_type_more_qualified) 8002 << New->getDeclName() << NewTy << OldTy; 8003 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8004 return true; 8005 }; 8006 8007 return false; 8008} 8009 8010/// \brief Mark the given method pure. 8011/// 8012/// \param Method the method to be marked pure. 8013/// 8014/// \param InitRange the source range that covers the "0" initializer. 8015bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8016 SourceLocation EndLoc = InitRange.getEnd(); 8017 if (EndLoc.isValid()) 8018 Method->setRangeEnd(EndLoc); 8019 8020 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8021 Method->setPure(); 8022 return false; 8023 } 8024 8025 if (!Method->isInvalidDecl()) 8026 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8027 << Method->getDeclName() << InitRange; 8028 return true; 8029} 8030 8031/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8032/// an initializer for the out-of-line declaration 'Dcl'. The scope 8033/// is a fresh scope pushed for just this purpose. 8034/// 8035/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8036/// static data member of class X, names should be looked up in the scope of 8037/// class X. 8038void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8039 // If there is no declaration, there was an error parsing it. 8040 if (D == 0 || D->isInvalidDecl()) return; 8041 8042 // We should only get called for declarations with scope specifiers, like: 8043 // int foo::bar; 8044 assert(D->isOutOfLine()); 8045 EnterDeclaratorContext(S, D->getDeclContext()); 8046} 8047 8048/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8049/// initializer for the out-of-line declaration 'D'. 8050void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8051 // If there is no declaration, there was an error parsing it. 8052 if (D == 0 || D->isInvalidDecl()) return; 8053 8054 assert(D->isOutOfLine()); 8055 ExitDeclaratorContext(S); 8056} 8057 8058/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8059/// C++ if/switch/while/for statement. 8060/// e.g: "if (int x = f()) {...}" 8061DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8062 // C++ 6.4p2: 8063 // The declarator shall not specify a function or an array. 8064 // The type-specifier-seq shall not contain typedef and shall not declare a 8065 // new class or enumeration. 8066 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8067 "Parser allowed 'typedef' as storage class of condition decl."); 8068 8069 TagDecl *OwnedTag = 0; 8070 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8071 QualType Ty = TInfo->getType(); 8072 8073 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8074 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8075 // would be created and CXXConditionDeclExpr wants a VarDecl. 8076 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8077 << D.getSourceRange(); 8078 return DeclResult(); 8079 } else if (OwnedTag && OwnedTag->isDefinition()) { 8080 // The type-specifier-seq shall not declare a new class or enumeration. 8081 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8082 } 8083 8084 Decl *Dcl = ActOnDeclarator(S, D); 8085 if (!Dcl) 8086 return DeclResult(); 8087 8088 return Dcl; 8089} 8090 8091void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8092 bool DefinitionRequired) { 8093 // Ignore any vtable uses in unevaluated operands or for classes that do 8094 // not have a vtable. 8095 if (!Class->isDynamicClass() || Class->isDependentContext() || 8096 CurContext->isDependentContext() || 8097 ExprEvalContexts.back().Context == Unevaluated) 8098 return; 8099 8100 // Try to insert this class into the map. 8101 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8102 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8103 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8104 if (!Pos.second) { 8105 // If we already had an entry, check to see if we are promoting this vtable 8106 // to required a definition. If so, we need to reappend to the VTableUses 8107 // list, since we may have already processed the first entry. 8108 if (DefinitionRequired && !Pos.first->second) { 8109 Pos.first->second = true; 8110 } else { 8111 // Otherwise, we can early exit. 8112 return; 8113 } 8114 } 8115 8116 // Local classes need to have their virtual members marked 8117 // immediately. For all other classes, we mark their virtual members 8118 // at the end of the translation unit. 8119 if (Class->isLocalClass()) 8120 MarkVirtualMembersReferenced(Loc, Class); 8121 else 8122 VTableUses.push_back(std::make_pair(Class, Loc)); 8123} 8124 8125bool Sema::DefineUsedVTables() { 8126 if (VTableUses.empty()) 8127 return false; 8128 8129 // Note: The VTableUses vector could grow as a result of marking 8130 // the members of a class as "used", so we check the size each 8131 // time through the loop and prefer indices (with are stable) to 8132 // iterators (which are not). 8133 bool DefinedAnything = false; 8134 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8135 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8136 if (!Class) 8137 continue; 8138 8139 SourceLocation Loc = VTableUses[I].second; 8140 8141 // If this class has a key function, but that key function is 8142 // defined in another translation unit, we don't need to emit the 8143 // vtable even though we're using it. 8144 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 8145 if (KeyFunction && !KeyFunction->hasBody()) { 8146 switch (KeyFunction->getTemplateSpecializationKind()) { 8147 case TSK_Undeclared: 8148 case TSK_ExplicitSpecialization: 8149 case TSK_ExplicitInstantiationDeclaration: 8150 // The key function is in another translation unit. 8151 continue; 8152 8153 case TSK_ExplicitInstantiationDefinition: 8154 case TSK_ImplicitInstantiation: 8155 // We will be instantiating the key function. 8156 break; 8157 } 8158 } else if (!KeyFunction) { 8159 // If we have a class with no key function that is the subject 8160 // of an explicit instantiation declaration, suppress the 8161 // vtable; it will live with the explicit instantiation 8162 // definition. 8163 bool IsExplicitInstantiationDeclaration 8164 = Class->getTemplateSpecializationKind() 8165 == TSK_ExplicitInstantiationDeclaration; 8166 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 8167 REnd = Class->redecls_end(); 8168 R != REnd; ++R) { 8169 TemplateSpecializationKind TSK 8170 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 8171 if (TSK == TSK_ExplicitInstantiationDeclaration) 8172 IsExplicitInstantiationDeclaration = true; 8173 else if (TSK == TSK_ExplicitInstantiationDefinition) { 8174 IsExplicitInstantiationDeclaration = false; 8175 break; 8176 } 8177 } 8178 8179 if (IsExplicitInstantiationDeclaration) 8180 continue; 8181 } 8182 8183 // Mark all of the virtual members of this class as referenced, so 8184 // that we can build a vtable. Then, tell the AST consumer that a 8185 // vtable for this class is required. 8186 DefinedAnything = true; 8187 MarkVirtualMembersReferenced(Loc, Class); 8188 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8189 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 8190 8191 // Optionally warn if we're emitting a weak vtable. 8192 if (Class->getLinkage() == ExternalLinkage && 8193 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 8194 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 8195 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 8196 } 8197 } 8198 VTableUses.clear(); 8199 8200 return DefinedAnything; 8201} 8202 8203void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 8204 const CXXRecordDecl *RD) { 8205 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 8206 e = RD->method_end(); i != e; ++i) { 8207 CXXMethodDecl *MD = *i; 8208 8209 // C++ [basic.def.odr]p2: 8210 // [...] A virtual member function is used if it is not pure. [...] 8211 if (MD->isVirtual() && !MD->isPure()) 8212 MarkDeclarationReferenced(Loc, MD); 8213 } 8214 8215 // Only classes that have virtual bases need a VTT. 8216 if (RD->getNumVBases() == 0) 8217 return; 8218 8219 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 8220 e = RD->bases_end(); i != e; ++i) { 8221 const CXXRecordDecl *Base = 8222 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 8223 if (Base->getNumVBases() == 0) 8224 continue; 8225 MarkVirtualMembersReferenced(Loc, Base); 8226 } 8227} 8228 8229/// SetIvarInitializers - This routine builds initialization ASTs for the 8230/// Objective-C implementation whose ivars need be initialized. 8231void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 8232 if (!getLangOptions().CPlusPlus) 8233 return; 8234 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 8235 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 8236 CollectIvarsToConstructOrDestruct(OID, ivars); 8237 if (ivars.empty()) 8238 return; 8239 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 8240 for (unsigned i = 0; i < ivars.size(); i++) { 8241 FieldDecl *Field = ivars[i]; 8242 if (Field->isInvalidDecl()) 8243 continue; 8244 8245 CXXCtorInitializer *Member; 8246 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 8247 InitializationKind InitKind = 8248 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 8249 8250 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 8251 ExprResult MemberInit = 8252 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 8253 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 8254 // Note, MemberInit could actually come back empty if no initialization 8255 // is required (e.g., because it would call a trivial default constructor) 8256 if (!MemberInit.get() || MemberInit.isInvalid()) 8257 continue; 8258 8259 Member = 8260 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 8261 SourceLocation(), 8262 MemberInit.takeAs<Expr>(), 8263 SourceLocation()); 8264 AllToInit.push_back(Member); 8265 8266 // Be sure that the destructor is accessible and is marked as referenced. 8267 if (const RecordType *RecordTy 8268 = Context.getBaseElementType(Field->getType()) 8269 ->getAs<RecordType>()) { 8270 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 8271 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 8272 MarkDeclarationReferenced(Field->getLocation(), Destructor); 8273 CheckDestructorAccess(Field->getLocation(), Destructor, 8274 PDiag(diag::err_access_dtor_ivar) 8275 << Context.getBaseElementType(Field->getType())); 8276 } 8277 } 8278 } 8279 ObjCImplementation->setIvarInitializers(Context, 8280 AllToInit.data(), AllToInit.size()); 8281 } 8282} 8283 8284static 8285void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 8286 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 8287 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 8288 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 8289 Sema &S) { 8290 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8291 CE = Current.end(); 8292 if (Ctor->isInvalidDecl()) 8293 return; 8294 8295 const FunctionDecl *FNTarget = 0; 8296 CXXConstructorDecl *Target; 8297 8298 // We ignore the result here since if we don't have a body, Target will be 8299 // null below. 8300 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 8301 Target 8302= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 8303 8304 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 8305 // Avoid dereferencing a null pointer here. 8306 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 8307 8308 if (!Current.insert(Canonical)) 8309 return; 8310 8311 // We know that beyond here, we aren't chaining into a cycle. 8312 if (!Target || !Target->isDelegatingConstructor() || 8313 Target->isInvalidDecl() || Valid.count(TCanonical)) { 8314 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8315 Valid.insert(*CI); 8316 Current.clear(); 8317 // We've hit a cycle. 8318 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 8319 Current.count(TCanonical)) { 8320 // If we haven't diagnosed this cycle yet, do so now. 8321 if (!Invalid.count(TCanonical)) { 8322 S.Diag((*Ctor->init_begin())->getSourceLocation(), 8323 diag::warn_delegating_ctor_cycle) 8324 << Ctor; 8325 8326 // Don't add a note for a function delegating directo to itself. 8327 if (TCanonical != Canonical) 8328 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 8329 8330 CXXConstructorDecl *C = Target; 8331 while (C->getCanonicalDecl() != Canonical) { 8332 (void)C->getTargetConstructor()->hasBody(FNTarget); 8333 assert(FNTarget && "Ctor cycle through bodiless function"); 8334 8335 C 8336 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8337 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8338 } 8339 } 8340 8341 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8342 Invalid.insert(*CI); 8343 Current.clear(); 8344 } else { 8345 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8346 } 8347} 8348 8349 8350void Sema::CheckDelegatingCtorCycles() { 8351 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8352 8353 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8354 CE = Current.end(); 8355 8356 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8357 I = DelegatingCtorDecls.begin(), 8358 E = DelegatingCtorDecls.end(); 8359 I != E; ++I) { 8360 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8361 } 8362 8363 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8364 (*CI)->setInvalidDecl(); 8365} 8366