SemaDeclCXX.cpp revision 2b32dad701ef3e666e3b9cea02e1d094a1078c6f
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/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// \brief Merge the exception specifications of two variable declarations. 387/// 388/// This is called when there's a redeclaration of a VarDecl. The function 389/// checks if the redeclaration might have an exception specification and 390/// validates compatibility and merges the specs if necessary. 391void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 392 // Shortcut if exceptions are disabled. 393 if (!getLangOptions().CXXExceptions) 394 return; 395 396 assert(Context.hasSameType(New->getType(), Old->getType()) && 397 "Should only be called if types are otherwise the same."); 398 399 QualType NewType = New->getType(); 400 QualType OldType = Old->getType(); 401 402 // We're only interested in pointers and references to functions, as well 403 // as pointers to member functions. 404 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 405 NewType = R->getPointeeType(); 406 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 407 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 408 NewType = P->getPointeeType(); 409 OldType = OldType->getAs<PointerType>()->getPointeeType(); 410 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 411 NewType = M->getPointeeType(); 412 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 413 } 414 415 if (!NewType->isFunctionProtoType()) 416 return; 417 418 // There's lots of special cases for functions. For function pointers, system 419 // libraries are hopefully not as broken so that we don't need these 420 // workarounds. 421 if (CheckEquivalentExceptionSpec( 422 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 423 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 424 New->setInvalidDecl(); 425 } 426} 427 428/// CheckCXXDefaultArguments - Verify that the default arguments for a 429/// function declaration are well-formed according to C++ 430/// [dcl.fct.default]. 431void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 432 unsigned NumParams = FD->getNumParams(); 433 unsigned p; 434 435 // Find first parameter with a default argument 436 for (p = 0; p < NumParams; ++p) { 437 ParmVarDecl *Param = FD->getParamDecl(p); 438 if (Param->hasDefaultArg()) 439 break; 440 } 441 442 // C++ [dcl.fct.default]p4: 443 // In a given function declaration, all parameters 444 // subsequent to a parameter with a default argument shall 445 // have default arguments supplied in this or previous 446 // declarations. A default argument shall not be redefined 447 // by a later declaration (not even to the same value). 448 unsigned LastMissingDefaultArg = 0; 449 for (; p < NumParams; ++p) { 450 ParmVarDecl *Param = FD->getParamDecl(p); 451 if (!Param->hasDefaultArg()) { 452 if (Param->isInvalidDecl()) 453 /* We already complained about this parameter. */; 454 else if (Param->getIdentifier()) 455 Diag(Param->getLocation(), 456 diag::err_param_default_argument_missing_name) 457 << Param->getIdentifier(); 458 else 459 Diag(Param->getLocation(), 460 diag::err_param_default_argument_missing); 461 462 LastMissingDefaultArg = p; 463 } 464 } 465 466 if (LastMissingDefaultArg > 0) { 467 // Some default arguments were missing. Clear out all of the 468 // default arguments up to (and including) the last missing 469 // default argument, so that we leave the function parameters 470 // in a semantically valid state. 471 for (p = 0; p <= LastMissingDefaultArg; ++p) { 472 ParmVarDecl *Param = FD->getParamDecl(p); 473 if (Param->hasDefaultArg()) { 474 Param->setDefaultArg(0); 475 } 476 } 477 } 478} 479 480/// isCurrentClassName - Determine whether the identifier II is the 481/// name of the class type currently being defined. In the case of 482/// nested classes, this will only return true if II is the name of 483/// the innermost class. 484bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 485 const CXXScopeSpec *SS) { 486 assert(getLangOptions().CPlusPlus && "No class names in C!"); 487 488 CXXRecordDecl *CurDecl; 489 if (SS && SS->isSet() && !SS->isInvalid()) { 490 DeclContext *DC = computeDeclContext(*SS, true); 491 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 492 } else 493 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 494 495 if (CurDecl && CurDecl->getIdentifier()) 496 return &II == CurDecl->getIdentifier(); 497 else 498 return false; 499} 500 501/// \brief Check the validity of a C++ base class specifier. 502/// 503/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 504/// and returns NULL otherwise. 505CXXBaseSpecifier * 506Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 507 SourceRange SpecifierRange, 508 bool Virtual, AccessSpecifier Access, 509 TypeSourceInfo *TInfo, 510 SourceLocation EllipsisLoc) { 511 QualType BaseType = TInfo->getType(); 512 513 // C++ [class.union]p1: 514 // A union shall not have base classes. 515 if (Class->isUnion()) { 516 Diag(Class->getLocation(), diag::err_base_clause_on_union) 517 << SpecifierRange; 518 return 0; 519 } 520 521 if (EllipsisLoc.isValid() && 522 !TInfo->getType()->containsUnexpandedParameterPack()) { 523 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 524 << TInfo->getTypeLoc().getSourceRange(); 525 EllipsisLoc = SourceLocation(); 526 } 527 528 if (BaseType->isDependentType()) 529 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 530 Class->getTagKind() == TTK_Class, 531 Access, TInfo, EllipsisLoc); 532 533 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 534 535 // Base specifiers must be record types. 536 if (!BaseType->isRecordType()) { 537 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 538 return 0; 539 } 540 541 // C++ [class.union]p1: 542 // A union shall not be used as a base class. 543 if (BaseType->isUnionType()) { 544 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 545 return 0; 546 } 547 548 // C++ [class.derived]p2: 549 // The class-name in a base-specifier shall not be an incompletely 550 // defined class. 551 if (RequireCompleteType(BaseLoc, BaseType, 552 PDiag(diag::err_incomplete_base_class) 553 << SpecifierRange)) { 554 Class->setInvalidDecl(); 555 return 0; 556 } 557 558 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 559 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 560 assert(BaseDecl && "Record type has no declaration"); 561 BaseDecl = BaseDecl->getDefinition(); 562 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 563 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 564 assert(CXXBaseDecl && "Base type is not a C++ type"); 565 566 // C++ [class.derived]p2: 567 // If a class is marked with the class-virt-specifier final and it appears 568 // as a base-type-specifier in a base-clause (10 class.derived), the program 569 // is ill-formed. 570 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 571 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 572 << CXXBaseDecl->getDeclName(); 573 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 574 << CXXBaseDecl->getDeclName(); 575 return 0; 576 } 577 578 if (BaseDecl->isInvalidDecl()) 579 Class->setInvalidDecl(); 580 581 // Create the base specifier. 582 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 583 Class->getTagKind() == TTK_Class, 584 Access, TInfo, EllipsisLoc); 585} 586 587/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 588/// one entry in the base class list of a class specifier, for 589/// example: 590/// class foo : public bar, virtual private baz { 591/// 'public bar' and 'virtual private baz' are each base-specifiers. 592BaseResult 593Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 594 bool Virtual, AccessSpecifier Access, 595 ParsedType basetype, SourceLocation BaseLoc, 596 SourceLocation EllipsisLoc) { 597 if (!classdecl) 598 return true; 599 600 AdjustDeclIfTemplate(classdecl); 601 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 602 if (!Class) 603 return true; 604 605 TypeSourceInfo *TInfo = 0; 606 GetTypeFromParser(basetype, &TInfo); 607 608 if (EllipsisLoc.isInvalid() && 609 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 610 UPPC_BaseType)) 611 return true; 612 613 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 614 Virtual, Access, TInfo, 615 EllipsisLoc)) 616 return BaseSpec; 617 618 return true; 619} 620 621/// \brief Performs the actual work of attaching the given base class 622/// specifiers to a C++ class. 623bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 624 unsigned NumBases) { 625 if (NumBases == 0) 626 return false; 627 628 // Used to keep track of which base types we have already seen, so 629 // that we can properly diagnose redundant direct base types. Note 630 // that the key is always the unqualified canonical type of the base 631 // class. 632 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 633 634 // Copy non-redundant base specifiers into permanent storage. 635 unsigned NumGoodBases = 0; 636 bool Invalid = false; 637 for (unsigned idx = 0; idx < NumBases; ++idx) { 638 QualType NewBaseType 639 = Context.getCanonicalType(Bases[idx]->getType()); 640 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 641 if (!Class->hasObjectMember()) { 642 if (const RecordType *FDTTy = 643 NewBaseType.getTypePtr()->getAs<RecordType>()) 644 if (FDTTy->getDecl()->hasObjectMember()) 645 Class->setHasObjectMember(true); 646 } 647 648 if (KnownBaseTypes[NewBaseType]) { 649 // C++ [class.mi]p3: 650 // A class shall not be specified as a direct base class of a 651 // derived class more than once. 652 Diag(Bases[idx]->getSourceRange().getBegin(), 653 diag::err_duplicate_base_class) 654 << KnownBaseTypes[NewBaseType]->getType() 655 << Bases[idx]->getSourceRange(); 656 657 // Delete the duplicate base class specifier; we're going to 658 // overwrite its pointer later. 659 Context.Deallocate(Bases[idx]); 660 661 Invalid = true; 662 } else { 663 // Okay, add this new base class. 664 KnownBaseTypes[NewBaseType] = Bases[idx]; 665 Bases[NumGoodBases++] = Bases[idx]; 666 } 667 } 668 669 // Attach the remaining base class specifiers to the derived class. 670 Class->setBases(Bases, NumGoodBases); 671 672 // Delete the remaining (good) base class specifiers, since their 673 // data has been copied into the CXXRecordDecl. 674 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 675 Context.Deallocate(Bases[idx]); 676 677 return Invalid; 678} 679 680/// ActOnBaseSpecifiers - Attach the given base specifiers to the 681/// class, after checking whether there are any duplicate base 682/// classes. 683void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 684 unsigned NumBases) { 685 if (!ClassDecl || !Bases || !NumBases) 686 return; 687 688 AdjustDeclIfTemplate(ClassDecl); 689 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 690 (CXXBaseSpecifier**)(Bases), NumBases); 691} 692 693static CXXRecordDecl *GetClassForType(QualType T) { 694 if (const RecordType *RT = T->getAs<RecordType>()) 695 return cast<CXXRecordDecl>(RT->getDecl()); 696 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 697 return ICT->getDecl(); 698 else 699 return 0; 700} 701 702/// \brief Determine whether the type \p Derived is a C++ class that is 703/// derived from the type \p Base. 704bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 705 if (!getLangOptions().CPlusPlus) 706 return false; 707 708 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 709 if (!DerivedRD) 710 return false; 711 712 CXXRecordDecl *BaseRD = GetClassForType(Base); 713 if (!BaseRD) 714 return false; 715 716 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 717 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 718} 719 720/// \brief Determine whether the type \p Derived is a C++ class that is 721/// derived from the type \p Base. 722bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 723 if (!getLangOptions().CPlusPlus) 724 return false; 725 726 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 727 if (!DerivedRD) 728 return false; 729 730 CXXRecordDecl *BaseRD = GetClassForType(Base); 731 if (!BaseRD) 732 return false; 733 734 return DerivedRD->isDerivedFrom(BaseRD, Paths); 735} 736 737void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 738 CXXCastPath &BasePathArray) { 739 assert(BasePathArray.empty() && "Base path array must be empty!"); 740 assert(Paths.isRecordingPaths() && "Must record paths!"); 741 742 const CXXBasePath &Path = Paths.front(); 743 744 // We first go backward and check if we have a virtual base. 745 // FIXME: It would be better if CXXBasePath had the base specifier for 746 // the nearest virtual base. 747 unsigned Start = 0; 748 for (unsigned I = Path.size(); I != 0; --I) { 749 if (Path[I - 1].Base->isVirtual()) { 750 Start = I - 1; 751 break; 752 } 753 } 754 755 // Now add all bases. 756 for (unsigned I = Start, E = Path.size(); I != E; ++I) 757 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 758} 759 760/// \brief Determine whether the given base path includes a virtual 761/// base class. 762bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 763 for (CXXCastPath::const_iterator B = BasePath.begin(), 764 BEnd = BasePath.end(); 765 B != BEnd; ++B) 766 if ((*B)->isVirtual()) 767 return true; 768 769 return false; 770} 771 772/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 773/// conversion (where Derived and Base are class types) is 774/// well-formed, meaning that the conversion is unambiguous (and 775/// that all of the base classes are accessible). Returns true 776/// and emits a diagnostic if the code is ill-formed, returns false 777/// otherwise. Loc is the location where this routine should point to 778/// if there is an error, and Range is the source range to highlight 779/// if there is an error. 780bool 781Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 782 unsigned InaccessibleBaseID, 783 unsigned AmbigiousBaseConvID, 784 SourceLocation Loc, SourceRange Range, 785 DeclarationName Name, 786 CXXCastPath *BasePath) { 787 // First, determine whether the path from Derived to Base is 788 // ambiguous. This is slightly more expensive than checking whether 789 // the Derived to Base conversion exists, because here we need to 790 // explore multiple paths to determine if there is an ambiguity. 791 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 792 /*DetectVirtual=*/false); 793 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 794 assert(DerivationOkay && 795 "Can only be used with a derived-to-base conversion"); 796 (void)DerivationOkay; 797 798 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 799 if (InaccessibleBaseID) { 800 // Check that the base class can be accessed. 801 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 802 InaccessibleBaseID)) { 803 case AR_inaccessible: 804 return true; 805 case AR_accessible: 806 case AR_dependent: 807 case AR_delayed: 808 break; 809 } 810 } 811 812 // Build a base path if necessary. 813 if (BasePath) 814 BuildBasePathArray(Paths, *BasePath); 815 return false; 816 } 817 818 // We know that the derived-to-base conversion is ambiguous, and 819 // we're going to produce a diagnostic. Perform the derived-to-base 820 // search just one more time to compute all of the possible paths so 821 // that we can print them out. This is more expensive than any of 822 // the previous derived-to-base checks we've done, but at this point 823 // performance isn't as much of an issue. 824 Paths.clear(); 825 Paths.setRecordingPaths(true); 826 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 827 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 828 (void)StillOkay; 829 830 // Build up a textual representation of the ambiguous paths, e.g., 831 // D -> B -> A, that will be used to illustrate the ambiguous 832 // conversions in the diagnostic. We only print one of the paths 833 // to each base class subobject. 834 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 835 836 Diag(Loc, AmbigiousBaseConvID) 837 << Derived << Base << PathDisplayStr << Range << Name; 838 return true; 839} 840 841bool 842Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 843 SourceLocation Loc, SourceRange Range, 844 CXXCastPath *BasePath, 845 bool IgnoreAccess) { 846 return CheckDerivedToBaseConversion(Derived, Base, 847 IgnoreAccess ? 0 848 : diag::err_upcast_to_inaccessible_base, 849 diag::err_ambiguous_derived_to_base_conv, 850 Loc, Range, DeclarationName(), 851 BasePath); 852} 853 854 855/// @brief Builds a string representing ambiguous paths from a 856/// specific derived class to different subobjects of the same base 857/// class. 858/// 859/// This function builds a string that can be used in error messages 860/// to show the different paths that one can take through the 861/// inheritance hierarchy to go from the derived class to different 862/// subobjects of a base class. The result looks something like this: 863/// @code 864/// struct D -> struct B -> struct A 865/// struct D -> struct C -> struct A 866/// @endcode 867std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 868 std::string PathDisplayStr; 869 std::set<unsigned> DisplayedPaths; 870 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 871 Path != Paths.end(); ++Path) { 872 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 873 // We haven't displayed a path to this particular base 874 // class subobject yet. 875 PathDisplayStr += "\n "; 876 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 877 for (CXXBasePath::const_iterator Element = Path->begin(); 878 Element != Path->end(); ++Element) 879 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 880 } 881 } 882 883 return PathDisplayStr; 884} 885 886//===----------------------------------------------------------------------===// 887// C++ class member Handling 888//===----------------------------------------------------------------------===// 889 890/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 891Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 892 SourceLocation ASLoc, 893 SourceLocation ColonLoc) { 894 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 895 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 896 ASLoc, ColonLoc); 897 CurContext->addHiddenDecl(ASDecl); 898 return ASDecl; 899} 900 901/// CheckOverrideControl - Check C++0x override control semantics. 902void Sema::CheckOverrideControl(const Decl *D) { 903 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 904 if (!MD || !MD->isVirtual()) 905 return; 906 907 if (MD->isDependentContext()) 908 return; 909 910 // C++0x [class.virtual]p3: 911 // If a virtual function is marked with the virt-specifier override and does 912 // not override a member function of a base class, 913 // the program is ill-formed. 914 bool HasOverriddenMethods = 915 MD->begin_overridden_methods() != MD->end_overridden_methods(); 916 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 917 Diag(MD->getLocation(), 918 diag::err_function_marked_override_not_overriding) 919 << MD->getDeclName(); 920 return; 921 } 922 923 // C++0x [class.derived]p8: 924 // In a class definition marked with the class-virt-specifier explicit, 925 // if a virtual member function that is neither implicitly-declared nor a 926 // destructor overrides a member function of a base class and it is not 927 // marked with the virt-specifier override, the program is ill-formed. 928 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 929 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 930 llvm::SmallVector<const CXXMethodDecl*, 4> 931 OverriddenMethods(MD->begin_overridden_methods(), 932 MD->end_overridden_methods()); 933 934 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 935 << MD->getDeclName() 936 << (unsigned)OverriddenMethods.size(); 937 938 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 939 Diag(OverriddenMethods[I]->getLocation(), 940 diag::note_overridden_virtual_function); 941 } 942} 943 944/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 945/// function overrides a virtual member function marked 'final', according to 946/// C++0x [class.virtual]p3. 947bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 948 const CXXMethodDecl *Old) { 949 if (!Old->hasAttr<FinalAttr>()) 950 return false; 951 952 Diag(New->getLocation(), diag::err_final_function_overridden) 953 << New->getDeclName(); 954 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 955 return true; 956} 957 958/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 959/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 960/// bitfield width if there is one and 'InitExpr' specifies the initializer if 961/// any. 962Decl * 963Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 964 MultiTemplateParamsArg TemplateParameterLists, 965 ExprTy *BW, const VirtSpecifiers &VS, 966 ExprTy *InitExpr, bool IsDefinition, 967 bool Deleted) { 968 const DeclSpec &DS = D.getDeclSpec(); 969 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 970 DeclarationName Name = NameInfo.getName(); 971 SourceLocation Loc = NameInfo.getLoc(); 972 973 // For anonymous bitfields, the location should point to the type. 974 if (Loc.isInvalid()) 975 Loc = D.getSourceRange().getBegin(); 976 977 Expr *BitWidth = static_cast<Expr*>(BW); 978 Expr *Init = static_cast<Expr*>(InitExpr); 979 980 assert(isa<CXXRecordDecl>(CurContext)); 981 assert(!DS.isFriendSpecified()); 982 983 bool isFunc = false; 984 if (D.isFunctionDeclarator()) 985 isFunc = true; 986 else if (D.getNumTypeObjects() == 0 && 987 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 988 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 989 isFunc = TDType->isFunctionType(); 990 } 991 992 // C++ 9.2p6: A member shall not be declared to have automatic storage 993 // duration (auto, register) or with the extern storage-class-specifier. 994 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 995 // data members and cannot be applied to names declared const or static, 996 // and cannot be applied to reference members. 997 switch (DS.getStorageClassSpec()) { 998 case DeclSpec::SCS_unspecified: 999 case DeclSpec::SCS_typedef: 1000 case DeclSpec::SCS_static: 1001 // FALL THROUGH. 1002 break; 1003 case DeclSpec::SCS_mutable: 1004 if (isFunc) { 1005 if (DS.getStorageClassSpecLoc().isValid()) 1006 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1007 else 1008 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1009 1010 // FIXME: It would be nicer if the keyword was ignored only for this 1011 // declarator. Otherwise we could get follow-up errors. 1012 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1013 } 1014 break; 1015 default: 1016 if (DS.getStorageClassSpecLoc().isValid()) 1017 Diag(DS.getStorageClassSpecLoc(), 1018 diag::err_storageclass_invalid_for_member); 1019 else 1020 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1021 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1022 } 1023 1024 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1025 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1026 !isFunc); 1027 1028 Decl *Member; 1029 if (isInstField) { 1030 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1031 1032 1033 if (SS.isSet() && !SS.isInvalid()) { 1034 // The user provided a superfluous scope specifier inside a class 1035 // definition: 1036 // 1037 // class X { 1038 // int X::member; 1039 // }; 1040 DeclContext *DC = 0; 1041 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1042 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1043 << Name << FixItHint::CreateRemoval(SS.getRange()); 1044 else 1045 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1046 << Name << SS.getRange(); 1047 1048 SS.clear(); 1049 } 1050 1051 // FIXME: Check for template parameters! 1052 // FIXME: Check that the name is an identifier! 1053 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1054 AS); 1055 assert(Member && "HandleField never returns null"); 1056 } else { 1057 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1058 if (!Member) { 1059 return 0; 1060 } 1061 1062 // Non-instance-fields can't have a bitfield. 1063 if (BitWidth) { 1064 if (Member->isInvalidDecl()) { 1065 // don't emit another diagnostic. 1066 } else if (isa<VarDecl>(Member)) { 1067 // C++ 9.6p3: A bit-field shall not be a static member. 1068 // "static member 'A' cannot be a bit-field" 1069 Diag(Loc, diag::err_static_not_bitfield) 1070 << Name << BitWidth->getSourceRange(); 1071 } else if (isa<TypedefDecl>(Member)) { 1072 // "typedef member 'x' cannot be a bit-field" 1073 Diag(Loc, diag::err_typedef_not_bitfield) 1074 << Name << BitWidth->getSourceRange(); 1075 } else { 1076 // A function typedef ("typedef int f(); f a;"). 1077 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1078 Diag(Loc, diag::err_not_integral_type_bitfield) 1079 << Name << cast<ValueDecl>(Member)->getType() 1080 << BitWidth->getSourceRange(); 1081 } 1082 1083 BitWidth = 0; 1084 Member->setInvalidDecl(); 1085 } 1086 1087 Member->setAccess(AS); 1088 1089 // If we have declared a member function template, set the access of the 1090 // templated declaration as well. 1091 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1092 FunTmpl->getTemplatedDecl()->setAccess(AS); 1093 } 1094 1095 if (VS.isOverrideSpecified()) { 1096 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1097 if (!MD || !MD->isVirtual()) { 1098 Diag(Member->getLocStart(), 1099 diag::override_keyword_only_allowed_on_virtual_member_functions) 1100 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1101 } else 1102 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1103 } 1104 if (VS.isFinalSpecified()) { 1105 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1106 if (!MD || !MD->isVirtual()) { 1107 Diag(Member->getLocStart(), 1108 diag::override_keyword_only_allowed_on_virtual_member_functions) 1109 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1110 } else 1111 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1112 } 1113 1114 if (VS.getLastLocation().isValid()) { 1115 // Update the end location of a method that has a virt-specifiers. 1116 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1117 MD->setRangeEnd(VS.getLastLocation()); 1118 } 1119 1120 CheckOverrideControl(Member); 1121 1122 assert((Name || isInstField) && "No identifier for non-field ?"); 1123 1124 if (Init) 1125 AddInitializerToDecl(Member, Init, false, 1126 DS.getTypeSpecType() == DeclSpec::TST_auto); 1127 if (Deleted) // FIXME: Source location is not very good. 1128 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1129 1130 FinalizeDeclaration(Member); 1131 1132 if (isInstField) 1133 FieldCollector->Add(cast<FieldDecl>(Member)); 1134 return Member; 1135} 1136 1137/// \brief Find the direct and/or virtual base specifiers that 1138/// correspond to the given base type, for use in base initialization 1139/// within a constructor. 1140static bool FindBaseInitializer(Sema &SemaRef, 1141 CXXRecordDecl *ClassDecl, 1142 QualType BaseType, 1143 const CXXBaseSpecifier *&DirectBaseSpec, 1144 const CXXBaseSpecifier *&VirtualBaseSpec) { 1145 // First, check for a direct base class. 1146 DirectBaseSpec = 0; 1147 for (CXXRecordDecl::base_class_const_iterator Base 1148 = ClassDecl->bases_begin(); 1149 Base != ClassDecl->bases_end(); ++Base) { 1150 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1151 // We found a direct base of this type. That's what we're 1152 // initializing. 1153 DirectBaseSpec = &*Base; 1154 break; 1155 } 1156 } 1157 1158 // Check for a virtual base class. 1159 // FIXME: We might be able to short-circuit this if we know in advance that 1160 // there are no virtual bases. 1161 VirtualBaseSpec = 0; 1162 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1163 // We haven't found a base yet; search the class hierarchy for a 1164 // virtual base class. 1165 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1166 /*DetectVirtual=*/false); 1167 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1168 BaseType, Paths)) { 1169 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1170 Path != Paths.end(); ++Path) { 1171 if (Path->back().Base->isVirtual()) { 1172 VirtualBaseSpec = Path->back().Base; 1173 break; 1174 } 1175 } 1176 } 1177 } 1178 1179 return DirectBaseSpec || VirtualBaseSpec; 1180} 1181 1182/// ActOnMemInitializer - Handle a C++ member initializer. 1183MemInitResult 1184Sema::ActOnMemInitializer(Decl *ConstructorD, 1185 Scope *S, 1186 CXXScopeSpec &SS, 1187 IdentifierInfo *MemberOrBase, 1188 ParsedType TemplateTypeTy, 1189 SourceLocation IdLoc, 1190 SourceLocation LParenLoc, 1191 ExprTy **Args, unsigned NumArgs, 1192 SourceLocation RParenLoc, 1193 SourceLocation EllipsisLoc) { 1194 if (!ConstructorD) 1195 return true; 1196 1197 AdjustDeclIfTemplate(ConstructorD); 1198 1199 CXXConstructorDecl *Constructor 1200 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1201 if (!Constructor) { 1202 // The user wrote a constructor initializer on a function that is 1203 // not a C++ constructor. Ignore the error for now, because we may 1204 // have more member initializers coming; we'll diagnose it just 1205 // once in ActOnMemInitializers. 1206 return true; 1207 } 1208 1209 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1210 1211 // C++ [class.base.init]p2: 1212 // Names in a mem-initializer-id are looked up in the scope of the 1213 // constructor's class and, if not found in that scope, are looked 1214 // up in the scope containing the constructor's definition. 1215 // [Note: if the constructor's class contains a member with the 1216 // same name as a direct or virtual base class of the class, a 1217 // mem-initializer-id naming the member or base class and composed 1218 // of a single identifier refers to the class member. A 1219 // mem-initializer-id for the hidden base class may be specified 1220 // using a qualified name. ] 1221 if (!SS.getScopeRep() && !TemplateTypeTy) { 1222 // Look for a member, first. 1223 FieldDecl *Member = 0; 1224 DeclContext::lookup_result Result 1225 = ClassDecl->lookup(MemberOrBase); 1226 if (Result.first != Result.second) { 1227 Member = dyn_cast<FieldDecl>(*Result.first); 1228 1229 if (Member) { 1230 if (EllipsisLoc.isValid()) 1231 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1232 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1233 1234 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1235 LParenLoc, RParenLoc); 1236 } 1237 1238 // Handle anonymous union case. 1239 if (IndirectFieldDecl* IndirectField 1240 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1241 if (EllipsisLoc.isValid()) 1242 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1243 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1244 1245 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1246 NumArgs, IdLoc, 1247 LParenLoc, RParenLoc); 1248 } 1249 } 1250 } 1251 // It didn't name a member, so see if it names a class. 1252 QualType BaseType; 1253 TypeSourceInfo *TInfo = 0; 1254 1255 if (TemplateTypeTy) { 1256 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1257 } else { 1258 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1259 LookupParsedName(R, S, &SS); 1260 1261 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1262 if (!TyD) { 1263 if (R.isAmbiguous()) return true; 1264 1265 // We don't want access-control diagnostics here. 1266 R.suppressDiagnostics(); 1267 1268 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1269 bool NotUnknownSpecialization = false; 1270 DeclContext *DC = computeDeclContext(SS, false); 1271 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1272 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1273 1274 if (!NotUnknownSpecialization) { 1275 // When the scope specifier can refer to a member of an unknown 1276 // specialization, we take it as a type name. 1277 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1278 SS.getWithLocInContext(Context), 1279 *MemberOrBase, IdLoc); 1280 if (BaseType.isNull()) 1281 return true; 1282 1283 R.clear(); 1284 R.setLookupName(MemberOrBase); 1285 } 1286 } 1287 1288 // If no results were found, try to correct typos. 1289 if (R.empty() && BaseType.isNull() && 1290 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1291 R.isSingleResult()) { 1292 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1293 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1294 // We have found a non-static data member with a similar 1295 // name to what was typed; complain and initialize that 1296 // member. 1297 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1298 << MemberOrBase << true << R.getLookupName() 1299 << FixItHint::CreateReplacement(R.getNameLoc(), 1300 R.getLookupName().getAsString()); 1301 Diag(Member->getLocation(), diag::note_previous_decl) 1302 << Member->getDeclName(); 1303 1304 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1305 LParenLoc, RParenLoc); 1306 } 1307 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1308 const CXXBaseSpecifier *DirectBaseSpec; 1309 const CXXBaseSpecifier *VirtualBaseSpec; 1310 if (FindBaseInitializer(*this, ClassDecl, 1311 Context.getTypeDeclType(Type), 1312 DirectBaseSpec, VirtualBaseSpec)) { 1313 // We have found a direct or virtual base class with a 1314 // similar name to what was typed; complain and initialize 1315 // that base class. 1316 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1317 << MemberOrBase << false << R.getLookupName() 1318 << FixItHint::CreateReplacement(R.getNameLoc(), 1319 R.getLookupName().getAsString()); 1320 1321 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1322 : VirtualBaseSpec; 1323 Diag(BaseSpec->getSourceRange().getBegin(), 1324 diag::note_base_class_specified_here) 1325 << BaseSpec->getType() 1326 << BaseSpec->getSourceRange(); 1327 1328 TyD = Type; 1329 } 1330 } 1331 } 1332 1333 if (!TyD && BaseType.isNull()) { 1334 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1335 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1336 return true; 1337 } 1338 } 1339 1340 if (BaseType.isNull()) { 1341 BaseType = Context.getTypeDeclType(TyD); 1342 if (SS.isSet()) { 1343 NestedNameSpecifier *Qualifier = 1344 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1345 1346 // FIXME: preserve source range information 1347 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1348 } 1349 } 1350 } 1351 1352 if (!TInfo) 1353 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1354 1355 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1356 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1357} 1358 1359/// Checks an initializer expression for use of uninitialized fields, such as 1360/// containing the field that is being initialized. Returns true if there is an 1361/// uninitialized field was used an updates the SourceLocation parameter; false 1362/// otherwise. 1363static bool InitExprContainsUninitializedFields(const Stmt *S, 1364 const ValueDecl *LhsField, 1365 SourceLocation *L) { 1366 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1367 1368 if (isa<CallExpr>(S)) { 1369 // Do not descend into function calls or constructors, as the use 1370 // of an uninitialized field may be valid. One would have to inspect 1371 // the contents of the function/ctor to determine if it is safe or not. 1372 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1373 // may be safe, depending on what the function/ctor does. 1374 return false; 1375 } 1376 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1377 const NamedDecl *RhsField = ME->getMemberDecl(); 1378 1379 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1380 // The member expression points to a static data member. 1381 assert(VD->isStaticDataMember() && 1382 "Member points to non-static data member!"); 1383 (void)VD; 1384 return false; 1385 } 1386 1387 if (isa<EnumConstantDecl>(RhsField)) { 1388 // The member expression points to an enum. 1389 return false; 1390 } 1391 1392 if (RhsField == LhsField) { 1393 // Initializing a field with itself. Throw a warning. 1394 // But wait; there are exceptions! 1395 // Exception #1: The field may not belong to this record. 1396 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1397 const Expr *base = ME->getBase(); 1398 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1399 // Even though the field matches, it does not belong to this record. 1400 return false; 1401 } 1402 // None of the exceptions triggered; return true to indicate an 1403 // uninitialized field was used. 1404 *L = ME->getMemberLoc(); 1405 return true; 1406 } 1407 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1408 // sizeof/alignof doesn't reference contents, do not warn. 1409 return false; 1410 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1411 // address-of doesn't reference contents (the pointer may be dereferenced 1412 // in the same expression but it would be rare; and weird). 1413 if (UOE->getOpcode() == UO_AddrOf) 1414 return false; 1415 } 1416 for (Stmt::const_child_range it = S->children(); it; ++it) { 1417 if (!*it) { 1418 // An expression such as 'member(arg ?: "")' may trigger this. 1419 continue; 1420 } 1421 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1422 return true; 1423 } 1424 return false; 1425} 1426 1427MemInitResult 1428Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1429 unsigned NumArgs, SourceLocation IdLoc, 1430 SourceLocation LParenLoc, 1431 SourceLocation RParenLoc) { 1432 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1433 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1434 assert((DirectMember || IndirectMember) && 1435 "Member must be a FieldDecl or IndirectFieldDecl"); 1436 1437 if (Member->isInvalidDecl()) 1438 return true; 1439 1440 // Diagnose value-uses of fields to initialize themselves, e.g. 1441 // foo(foo) 1442 // where foo is not also a parameter to the constructor. 1443 // TODO: implement -Wuninitialized and fold this into that framework. 1444 for (unsigned i = 0; i < NumArgs; ++i) { 1445 SourceLocation L; 1446 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1447 // FIXME: Return true in the case when other fields are used before being 1448 // uninitialized. For example, let this field be the i'th field. When 1449 // initializing the i'th field, throw a warning if any of the >= i'th 1450 // fields are used, as they are not yet initialized. 1451 // Right now we are only handling the case where the i'th field uses 1452 // itself in its initializer. 1453 Diag(L, diag::warn_field_is_uninit); 1454 } 1455 } 1456 1457 bool HasDependentArg = false; 1458 for (unsigned i = 0; i < NumArgs; i++) 1459 HasDependentArg |= Args[i]->isTypeDependent(); 1460 1461 Expr *Init; 1462 if (Member->getType()->isDependentType() || HasDependentArg) { 1463 // Can't check initialization for a member of dependent type or when 1464 // any of the arguments are type-dependent expressions. 1465 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1466 RParenLoc); 1467 1468 // Erase any temporaries within this evaluation context; we're not 1469 // going to track them in the AST, since we'll be rebuilding the 1470 // ASTs during template instantiation. 1471 ExprTemporaries.erase( 1472 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1473 ExprTemporaries.end()); 1474 } else { 1475 // Initialize the member. 1476 InitializedEntity MemberEntity = 1477 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1478 : InitializedEntity::InitializeMember(IndirectMember, 0); 1479 InitializationKind Kind = 1480 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1481 1482 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1483 1484 ExprResult MemberInit = 1485 InitSeq.Perform(*this, MemberEntity, Kind, 1486 MultiExprArg(*this, Args, NumArgs), 0); 1487 if (MemberInit.isInvalid()) 1488 return true; 1489 1490 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1491 1492 // C++0x [class.base.init]p7: 1493 // The initialization of each base and member constitutes a 1494 // full-expression. 1495 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1496 if (MemberInit.isInvalid()) 1497 return true; 1498 1499 // If we are in a dependent context, template instantiation will 1500 // perform this type-checking again. Just save the arguments that we 1501 // received in a ParenListExpr. 1502 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1503 // of the information that we have about the member 1504 // initializer. However, deconstructing the ASTs is a dicey process, 1505 // and this approach is far more likely to get the corner cases right. 1506 if (CurContext->isDependentContext()) 1507 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1508 RParenLoc); 1509 else 1510 Init = MemberInit.get(); 1511 } 1512 1513 if (DirectMember) { 1514 return new (Context) CXXCtorInitializer(Context, DirectMember, 1515 IdLoc, LParenLoc, Init, 1516 RParenLoc); 1517 } else { 1518 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1519 IdLoc, LParenLoc, Init, 1520 RParenLoc); 1521 } 1522} 1523 1524MemInitResult 1525Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1526 Expr **Args, unsigned NumArgs, 1527 SourceLocation NameLoc, 1528 SourceLocation LParenLoc, 1529 SourceLocation RParenLoc, 1530 CXXRecordDecl *ClassDecl) { 1531 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1532 if (!LangOpts.CPlusPlus0x) 1533 return Diag(Loc, diag::err_delegation_0x_only) 1534 << TInfo->getTypeLoc().getLocalSourceRange(); 1535 1536 // Initialize the object. 1537 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1538 QualType(ClassDecl->getTypeForDecl(), 0)); 1539 InitializationKind Kind = 1540 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1541 1542 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1543 1544 ExprResult DelegationInit = 1545 InitSeq.Perform(*this, DelegationEntity, Kind, 1546 MultiExprArg(*this, Args, NumArgs), 0); 1547 if (DelegationInit.isInvalid()) 1548 return true; 1549 1550 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1551 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1552 assert(Constructor && "Delegating constructor with no target?"); 1553 1554 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1555 1556 // C++0x [class.base.init]p7: 1557 // The initialization of each base and member constitutes a 1558 // full-expression. 1559 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1560 if (DelegationInit.isInvalid()) 1561 return true; 1562 1563 // If we are in a dependent context, template instantiation will 1564 // perform this type-checking again. Just save the arguments that we 1565 // received in a ParenListExpr. 1566 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1567 // of the information that we have about the base 1568 // initializer. However, deconstructing the ASTs is a dicey process, 1569 // and this approach is far more likely to get the corner cases right. 1570 if (CurContext->isDependentContext()) { 1571 ExprResult Init 1572 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1573 NumArgs, RParenLoc)); 1574 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1575 Constructor, Init.takeAs<Expr>(), 1576 RParenLoc); 1577 } 1578 1579 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1580 DelegationInit.takeAs<Expr>(), 1581 RParenLoc); 1582} 1583 1584MemInitResult 1585Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1586 Expr **Args, unsigned NumArgs, 1587 SourceLocation LParenLoc, SourceLocation RParenLoc, 1588 CXXRecordDecl *ClassDecl, 1589 SourceLocation EllipsisLoc) { 1590 bool HasDependentArg = false; 1591 for (unsigned i = 0; i < NumArgs; i++) 1592 HasDependentArg |= Args[i]->isTypeDependent(); 1593 1594 SourceLocation BaseLoc 1595 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1596 1597 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1598 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1599 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1600 1601 // C++ [class.base.init]p2: 1602 // [...] Unless the mem-initializer-id names a nonstatic data 1603 // member of the constructor's class or a direct or virtual base 1604 // of that class, the mem-initializer is ill-formed. A 1605 // mem-initializer-list can initialize a base class using any 1606 // name that denotes that base class type. 1607 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1608 1609 if (EllipsisLoc.isValid()) { 1610 // This is a pack expansion. 1611 if (!BaseType->containsUnexpandedParameterPack()) { 1612 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1613 << SourceRange(BaseLoc, RParenLoc); 1614 1615 EllipsisLoc = SourceLocation(); 1616 } 1617 } else { 1618 // Check for any unexpanded parameter packs. 1619 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1620 return true; 1621 1622 for (unsigned I = 0; I != NumArgs; ++I) 1623 if (DiagnoseUnexpandedParameterPack(Args[I])) 1624 return true; 1625 } 1626 1627 // Check for direct and virtual base classes. 1628 const CXXBaseSpecifier *DirectBaseSpec = 0; 1629 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1630 if (!Dependent) { 1631 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1632 BaseType)) 1633 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1634 LParenLoc, RParenLoc, ClassDecl); 1635 1636 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1637 VirtualBaseSpec); 1638 1639 // C++ [base.class.init]p2: 1640 // Unless the mem-initializer-id names a nonstatic data member of the 1641 // constructor's class or a direct or virtual base of that class, the 1642 // mem-initializer is ill-formed. 1643 if (!DirectBaseSpec && !VirtualBaseSpec) { 1644 // If the class has any dependent bases, then it's possible that 1645 // one of those types will resolve to the same type as 1646 // BaseType. Therefore, just treat this as a dependent base 1647 // class initialization. FIXME: Should we try to check the 1648 // initialization anyway? It seems odd. 1649 if (ClassDecl->hasAnyDependentBases()) 1650 Dependent = true; 1651 else 1652 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1653 << BaseType << Context.getTypeDeclType(ClassDecl) 1654 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1655 } 1656 } 1657 1658 if (Dependent) { 1659 // Can't check initialization for a base of dependent type or when 1660 // any of the arguments are type-dependent expressions. 1661 ExprResult BaseInit 1662 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1663 RParenLoc)); 1664 1665 // Erase any temporaries within this evaluation context; we're not 1666 // going to track them in the AST, since we'll be rebuilding the 1667 // ASTs during template instantiation. 1668 ExprTemporaries.erase( 1669 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1670 ExprTemporaries.end()); 1671 1672 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1673 /*IsVirtual=*/false, 1674 LParenLoc, 1675 BaseInit.takeAs<Expr>(), 1676 RParenLoc, 1677 EllipsisLoc); 1678 } 1679 1680 // C++ [base.class.init]p2: 1681 // If a mem-initializer-id is ambiguous because it designates both 1682 // a direct non-virtual base class and an inherited virtual base 1683 // class, the mem-initializer is ill-formed. 1684 if (DirectBaseSpec && VirtualBaseSpec) 1685 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1686 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1687 1688 CXXBaseSpecifier *BaseSpec 1689 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1690 if (!BaseSpec) 1691 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1692 1693 // Initialize the base. 1694 InitializedEntity BaseEntity = 1695 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1696 InitializationKind Kind = 1697 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1698 1699 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1700 1701 ExprResult BaseInit = 1702 InitSeq.Perform(*this, BaseEntity, Kind, 1703 MultiExprArg(*this, Args, NumArgs), 0); 1704 if (BaseInit.isInvalid()) 1705 return true; 1706 1707 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1708 1709 // C++0x [class.base.init]p7: 1710 // The initialization of each base and member constitutes a 1711 // full-expression. 1712 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1713 if (BaseInit.isInvalid()) 1714 return true; 1715 1716 // If we are in a dependent context, template instantiation will 1717 // perform this type-checking again. Just save the arguments that we 1718 // received in a ParenListExpr. 1719 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1720 // of the information that we have about the base 1721 // initializer. However, deconstructing the ASTs is a dicey process, 1722 // and this approach is far more likely to get the corner cases right. 1723 if (CurContext->isDependentContext()) { 1724 ExprResult Init 1725 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1726 RParenLoc)); 1727 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1728 BaseSpec->isVirtual(), 1729 LParenLoc, 1730 Init.takeAs<Expr>(), 1731 RParenLoc, 1732 EllipsisLoc); 1733 } 1734 1735 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1736 BaseSpec->isVirtual(), 1737 LParenLoc, 1738 BaseInit.takeAs<Expr>(), 1739 RParenLoc, 1740 EllipsisLoc); 1741} 1742 1743/// ImplicitInitializerKind - How an implicit base or member initializer should 1744/// initialize its base or member. 1745enum ImplicitInitializerKind { 1746 IIK_Default, 1747 IIK_Copy, 1748 IIK_Move 1749}; 1750 1751static bool 1752BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1753 ImplicitInitializerKind ImplicitInitKind, 1754 CXXBaseSpecifier *BaseSpec, 1755 bool IsInheritedVirtualBase, 1756 CXXCtorInitializer *&CXXBaseInit) { 1757 InitializedEntity InitEntity 1758 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1759 IsInheritedVirtualBase); 1760 1761 ExprResult BaseInit; 1762 1763 switch (ImplicitInitKind) { 1764 case IIK_Default: { 1765 InitializationKind InitKind 1766 = InitializationKind::CreateDefault(Constructor->getLocation()); 1767 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1768 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1769 MultiExprArg(SemaRef, 0, 0)); 1770 break; 1771 } 1772 1773 case IIK_Copy: { 1774 ParmVarDecl *Param = Constructor->getParamDecl(0); 1775 QualType ParamType = Param->getType().getNonReferenceType(); 1776 1777 Expr *CopyCtorArg = 1778 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1779 Constructor->getLocation(), ParamType, 1780 VK_LValue, 0); 1781 1782 // Cast to the base class to avoid ambiguities. 1783 QualType ArgTy = 1784 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1785 ParamType.getQualifiers()); 1786 1787 CXXCastPath BasePath; 1788 BasePath.push_back(BaseSpec); 1789 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1790 CK_UncheckedDerivedToBase, 1791 VK_LValue, &BasePath); 1792 1793 InitializationKind InitKind 1794 = InitializationKind::CreateDirect(Constructor->getLocation(), 1795 SourceLocation(), SourceLocation()); 1796 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1797 &CopyCtorArg, 1); 1798 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1799 MultiExprArg(&CopyCtorArg, 1)); 1800 break; 1801 } 1802 1803 case IIK_Move: 1804 assert(false && "Unhandled initializer kind!"); 1805 } 1806 1807 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1808 if (BaseInit.isInvalid()) 1809 return true; 1810 1811 CXXBaseInit = 1812 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1813 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1814 SourceLocation()), 1815 BaseSpec->isVirtual(), 1816 SourceLocation(), 1817 BaseInit.takeAs<Expr>(), 1818 SourceLocation(), 1819 SourceLocation()); 1820 1821 return false; 1822} 1823 1824static bool 1825BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1826 ImplicitInitializerKind ImplicitInitKind, 1827 FieldDecl *Field, 1828 CXXCtorInitializer *&CXXMemberInit) { 1829 if (Field->isInvalidDecl()) 1830 return true; 1831 1832 SourceLocation Loc = Constructor->getLocation(); 1833 1834 if (ImplicitInitKind == IIK_Copy) { 1835 ParmVarDecl *Param = Constructor->getParamDecl(0); 1836 QualType ParamType = Param->getType().getNonReferenceType(); 1837 1838 Expr *MemberExprBase = 1839 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1840 Loc, ParamType, VK_LValue, 0); 1841 1842 // Build a reference to this field within the parameter. 1843 CXXScopeSpec SS; 1844 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1845 Sema::LookupMemberName); 1846 MemberLookup.addDecl(Field, AS_public); 1847 MemberLookup.resolveKind(); 1848 ExprResult CopyCtorArg 1849 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1850 ParamType, Loc, 1851 /*IsArrow=*/false, 1852 SS, 1853 /*FirstQualifierInScope=*/0, 1854 MemberLookup, 1855 /*TemplateArgs=*/0); 1856 if (CopyCtorArg.isInvalid()) 1857 return true; 1858 1859 // When the field we are copying is an array, create index variables for 1860 // each dimension of the array. We use these index variables to subscript 1861 // the source array, and other clients (e.g., CodeGen) will perform the 1862 // necessary iteration with these index variables. 1863 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1864 QualType BaseType = Field->getType(); 1865 QualType SizeType = SemaRef.Context.getSizeType(); 1866 while (const ConstantArrayType *Array 1867 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1868 // Create the iteration variable for this array index. 1869 IdentifierInfo *IterationVarName = 0; 1870 { 1871 llvm::SmallString<8> Str; 1872 llvm::raw_svector_ostream OS(Str); 1873 OS << "__i" << IndexVariables.size(); 1874 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1875 } 1876 VarDecl *IterationVar 1877 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1878 IterationVarName, SizeType, 1879 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1880 SC_None, SC_None); 1881 IndexVariables.push_back(IterationVar); 1882 1883 // Create a reference to the iteration variable. 1884 ExprResult IterationVarRef 1885 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1886 assert(!IterationVarRef.isInvalid() && 1887 "Reference to invented variable cannot fail!"); 1888 1889 // Subscript the array with this iteration variable. 1890 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1891 Loc, 1892 IterationVarRef.take(), 1893 Loc); 1894 if (CopyCtorArg.isInvalid()) 1895 return true; 1896 1897 BaseType = Array->getElementType(); 1898 } 1899 1900 // Construct the entity that we will be initializing. For an array, this 1901 // will be first element in the array, which may require several levels 1902 // of array-subscript entities. 1903 llvm::SmallVector<InitializedEntity, 4> Entities; 1904 Entities.reserve(1 + IndexVariables.size()); 1905 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1906 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1907 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1908 0, 1909 Entities.back())); 1910 1911 // Direct-initialize to use the copy constructor. 1912 InitializationKind InitKind = 1913 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1914 1915 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1916 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1917 &CopyCtorArgE, 1); 1918 1919 ExprResult MemberInit 1920 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1921 MultiExprArg(&CopyCtorArgE, 1)); 1922 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1923 if (MemberInit.isInvalid()) 1924 return true; 1925 1926 CXXMemberInit 1927 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1928 MemberInit.takeAs<Expr>(), Loc, 1929 IndexVariables.data(), 1930 IndexVariables.size()); 1931 return false; 1932 } 1933 1934 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1935 1936 QualType FieldBaseElementType = 1937 SemaRef.Context.getBaseElementType(Field->getType()); 1938 1939 if (FieldBaseElementType->isRecordType()) { 1940 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1941 InitializationKind InitKind = 1942 InitializationKind::CreateDefault(Loc); 1943 1944 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1945 ExprResult MemberInit = 1946 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1947 1948 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1949 if (MemberInit.isInvalid()) 1950 return true; 1951 1952 CXXMemberInit = 1953 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1954 Field, Loc, Loc, 1955 MemberInit.get(), 1956 Loc); 1957 return false; 1958 } 1959 1960 if (FieldBaseElementType->isReferenceType()) { 1961 SemaRef.Diag(Constructor->getLocation(), 1962 diag::err_uninitialized_member_in_ctor) 1963 << (int)Constructor->isImplicit() 1964 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1965 << 0 << Field->getDeclName(); 1966 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1967 return true; 1968 } 1969 1970 if (FieldBaseElementType.isConstQualified()) { 1971 SemaRef.Diag(Constructor->getLocation(), 1972 diag::err_uninitialized_member_in_ctor) 1973 << (int)Constructor->isImplicit() 1974 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1975 << 1 << Field->getDeclName(); 1976 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1977 return true; 1978 } 1979 1980 // Nothing to initialize. 1981 CXXMemberInit = 0; 1982 return false; 1983} 1984 1985namespace { 1986struct BaseAndFieldInfo { 1987 Sema &S; 1988 CXXConstructorDecl *Ctor; 1989 bool AnyErrorsInInits; 1990 ImplicitInitializerKind IIK; 1991 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1992 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1993 1994 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1995 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1996 // FIXME: Handle implicit move constructors. 1997 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1998 IIK = IIK_Copy; 1999 else 2000 IIK = IIK_Default; 2001 } 2002}; 2003} 2004 2005static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2006 FieldDecl *Top, FieldDecl *Field) { 2007 2008 // Overwhelmingly common case: we have a direct initializer for this field. 2009 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2010 Info.AllToInit.push_back(Init); 2011 return false; 2012 } 2013 2014 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2015 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2016 assert(FieldClassType && "anonymous struct/union without record type"); 2017 CXXRecordDecl *FieldClassDecl 2018 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2019 2020 // Even though union members never have non-trivial default 2021 // constructions in C++03, we still build member initializers for aggregate 2022 // record types which can be union members, and C++0x allows non-trivial 2023 // default constructors for union members, so we ensure that only one 2024 // member is initialized for these. 2025 if (FieldClassDecl->isUnion()) { 2026 // First check for an explicit initializer for one field. 2027 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2028 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2029 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2030 Info.AllToInit.push_back(Init); 2031 2032 // Once we've initialized a field of an anonymous union, the union 2033 // field in the class is also initialized, so exit immediately. 2034 return false; 2035 } else if ((*FA)->isAnonymousStructOrUnion()) { 2036 if (CollectFieldInitializer(Info, Top, *FA)) 2037 return true; 2038 } 2039 } 2040 2041 // Fallthrough and construct a default initializer for the union as 2042 // a whole, which can call its default constructor if such a thing exists 2043 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2044 // behavior going forward with C++0x, when anonymous unions there are 2045 // finalized, we should revisit this. 2046 } else { 2047 // For structs, we simply descend through to initialize all members where 2048 // necessary. 2049 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2050 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2051 if (CollectFieldInitializer(Info, Top, *FA)) 2052 return true; 2053 } 2054 } 2055 } 2056 2057 // Don't try to build an implicit initializer if there were semantic 2058 // errors in any of the initializers (and therefore we might be 2059 // missing some that the user actually wrote). 2060 if (Info.AnyErrorsInInits) 2061 return false; 2062 2063 CXXCtorInitializer *Init = 0; 2064 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2065 return true; 2066 2067 if (Init) 2068 Info.AllToInit.push_back(Init); 2069 2070 return false; 2071} 2072 2073bool 2074Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2075 CXXCtorInitializer **Initializers, 2076 unsigned NumInitializers, 2077 bool AnyErrors) { 2078 if (Constructor->getDeclContext()->isDependentContext()) { 2079 // Just store the initializers as written, they will be checked during 2080 // instantiation. 2081 if (NumInitializers > 0) { 2082 Constructor->setNumCtorInitializers(NumInitializers); 2083 CXXCtorInitializer **baseOrMemberInitializers = 2084 new (Context) CXXCtorInitializer*[NumInitializers]; 2085 memcpy(baseOrMemberInitializers, Initializers, 2086 NumInitializers * sizeof(CXXCtorInitializer*)); 2087 Constructor->setCtorInitializers(baseOrMemberInitializers); 2088 } 2089 2090 return false; 2091 } 2092 2093 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2094 2095 // We need to build the initializer AST according to order of construction 2096 // and not what user specified in the Initializers list. 2097 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2098 if (!ClassDecl) 2099 return true; 2100 2101 bool HadError = false; 2102 2103 for (unsigned i = 0; i < NumInitializers; i++) { 2104 CXXCtorInitializer *Member = Initializers[i]; 2105 2106 if (Member->isBaseInitializer()) 2107 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2108 else 2109 Info.AllBaseFields[Member->getAnyMember()] = Member; 2110 } 2111 2112 // Keep track of the direct virtual bases. 2113 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2114 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2115 E = ClassDecl->bases_end(); I != E; ++I) { 2116 if (I->isVirtual()) 2117 DirectVBases.insert(I); 2118 } 2119 2120 // Push virtual bases before others. 2121 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2122 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2123 2124 if (CXXCtorInitializer *Value 2125 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2126 Info.AllToInit.push_back(Value); 2127 } else if (!AnyErrors) { 2128 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2129 CXXCtorInitializer *CXXBaseInit; 2130 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2131 VBase, IsInheritedVirtualBase, 2132 CXXBaseInit)) { 2133 HadError = true; 2134 continue; 2135 } 2136 2137 Info.AllToInit.push_back(CXXBaseInit); 2138 } 2139 } 2140 2141 // Non-virtual bases. 2142 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2143 E = ClassDecl->bases_end(); Base != E; ++Base) { 2144 // Virtuals are in the virtual base list and already constructed. 2145 if (Base->isVirtual()) 2146 continue; 2147 2148 if (CXXCtorInitializer *Value 2149 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2150 Info.AllToInit.push_back(Value); 2151 } else if (!AnyErrors) { 2152 CXXCtorInitializer *CXXBaseInit; 2153 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2154 Base, /*IsInheritedVirtualBase=*/false, 2155 CXXBaseInit)) { 2156 HadError = true; 2157 continue; 2158 } 2159 2160 Info.AllToInit.push_back(CXXBaseInit); 2161 } 2162 } 2163 2164 // Fields. 2165 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2166 E = ClassDecl->field_end(); Field != E; ++Field) { 2167 if ((*Field)->getType()->isIncompleteArrayType()) { 2168 assert(ClassDecl->hasFlexibleArrayMember() && 2169 "Incomplete array type is not valid"); 2170 continue; 2171 } 2172 if (CollectFieldInitializer(Info, *Field, *Field)) 2173 HadError = true; 2174 } 2175 2176 NumInitializers = Info.AllToInit.size(); 2177 if (NumInitializers > 0) { 2178 Constructor->setNumCtorInitializers(NumInitializers); 2179 CXXCtorInitializer **baseOrMemberInitializers = 2180 new (Context) CXXCtorInitializer*[NumInitializers]; 2181 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2182 NumInitializers * sizeof(CXXCtorInitializer*)); 2183 Constructor->setCtorInitializers(baseOrMemberInitializers); 2184 2185 // Constructors implicitly reference the base and member 2186 // destructors. 2187 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2188 Constructor->getParent()); 2189 } 2190 2191 return HadError; 2192} 2193 2194static void *GetKeyForTopLevelField(FieldDecl *Field) { 2195 // For anonymous unions, use the class declaration as the key. 2196 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2197 if (RT->getDecl()->isAnonymousStructOrUnion()) 2198 return static_cast<void *>(RT->getDecl()); 2199 } 2200 return static_cast<void *>(Field); 2201} 2202 2203static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2204 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2205} 2206 2207static void *GetKeyForMember(ASTContext &Context, 2208 CXXCtorInitializer *Member) { 2209 if (!Member->isAnyMemberInitializer()) 2210 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2211 2212 // For fields injected into the class via declaration of an anonymous union, 2213 // use its anonymous union class declaration as the unique key. 2214 FieldDecl *Field = Member->getAnyMember(); 2215 2216 // If the field is a member of an anonymous struct or union, our key 2217 // is the anonymous record decl that's a direct child of the class. 2218 RecordDecl *RD = Field->getParent(); 2219 if (RD->isAnonymousStructOrUnion()) { 2220 while (true) { 2221 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2222 if (Parent->isAnonymousStructOrUnion()) 2223 RD = Parent; 2224 else 2225 break; 2226 } 2227 2228 return static_cast<void *>(RD); 2229 } 2230 2231 return static_cast<void *>(Field); 2232} 2233 2234static void 2235DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2236 const CXXConstructorDecl *Constructor, 2237 CXXCtorInitializer **Inits, 2238 unsigned NumInits) { 2239 if (Constructor->getDeclContext()->isDependentContext()) 2240 return; 2241 2242 // Don't check initializers order unless the warning is enabled at the 2243 // location of at least one initializer. 2244 bool ShouldCheckOrder = false; 2245 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2246 CXXCtorInitializer *Init = Inits[InitIndex]; 2247 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2248 Init->getSourceLocation()) 2249 != Diagnostic::Ignored) { 2250 ShouldCheckOrder = true; 2251 break; 2252 } 2253 } 2254 if (!ShouldCheckOrder) 2255 return; 2256 2257 // Build the list of bases and members in the order that they'll 2258 // actually be initialized. The explicit initializers should be in 2259 // this same order but may be missing things. 2260 llvm::SmallVector<const void*, 32> IdealInitKeys; 2261 2262 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2263 2264 // 1. Virtual bases. 2265 for (CXXRecordDecl::base_class_const_iterator VBase = 2266 ClassDecl->vbases_begin(), 2267 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2268 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2269 2270 // 2. Non-virtual bases. 2271 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2272 E = ClassDecl->bases_end(); Base != E; ++Base) { 2273 if (Base->isVirtual()) 2274 continue; 2275 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2276 } 2277 2278 // 3. Direct fields. 2279 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2280 E = ClassDecl->field_end(); Field != E; ++Field) 2281 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2282 2283 unsigned NumIdealInits = IdealInitKeys.size(); 2284 unsigned IdealIndex = 0; 2285 2286 CXXCtorInitializer *PrevInit = 0; 2287 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2288 CXXCtorInitializer *Init = Inits[InitIndex]; 2289 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2290 2291 // Scan forward to try to find this initializer in the idealized 2292 // initializers list. 2293 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2294 if (InitKey == IdealInitKeys[IdealIndex]) 2295 break; 2296 2297 // If we didn't find this initializer, it must be because we 2298 // scanned past it on a previous iteration. That can only 2299 // happen if we're out of order; emit a warning. 2300 if (IdealIndex == NumIdealInits && PrevInit) { 2301 Sema::SemaDiagnosticBuilder D = 2302 SemaRef.Diag(PrevInit->getSourceLocation(), 2303 diag::warn_initializer_out_of_order); 2304 2305 if (PrevInit->isAnyMemberInitializer()) 2306 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2307 else 2308 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2309 2310 if (Init->isAnyMemberInitializer()) 2311 D << 0 << Init->getAnyMember()->getDeclName(); 2312 else 2313 D << 1 << Init->getBaseClassInfo()->getType(); 2314 2315 // Move back to the initializer's location in the ideal list. 2316 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2317 if (InitKey == IdealInitKeys[IdealIndex]) 2318 break; 2319 2320 assert(IdealIndex != NumIdealInits && 2321 "initializer not found in initializer list"); 2322 } 2323 2324 PrevInit = Init; 2325 } 2326} 2327 2328namespace { 2329bool CheckRedundantInit(Sema &S, 2330 CXXCtorInitializer *Init, 2331 CXXCtorInitializer *&PrevInit) { 2332 if (!PrevInit) { 2333 PrevInit = Init; 2334 return false; 2335 } 2336 2337 if (FieldDecl *Field = Init->getMember()) 2338 S.Diag(Init->getSourceLocation(), 2339 diag::err_multiple_mem_initialization) 2340 << Field->getDeclName() 2341 << Init->getSourceRange(); 2342 else { 2343 const Type *BaseClass = Init->getBaseClass(); 2344 assert(BaseClass && "neither field nor base"); 2345 S.Diag(Init->getSourceLocation(), 2346 diag::err_multiple_base_initialization) 2347 << QualType(BaseClass, 0) 2348 << Init->getSourceRange(); 2349 } 2350 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2351 << 0 << PrevInit->getSourceRange(); 2352 2353 return true; 2354} 2355 2356typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2357typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2358 2359bool CheckRedundantUnionInit(Sema &S, 2360 CXXCtorInitializer *Init, 2361 RedundantUnionMap &Unions) { 2362 FieldDecl *Field = Init->getAnyMember(); 2363 RecordDecl *Parent = Field->getParent(); 2364 if (!Parent->isAnonymousStructOrUnion()) 2365 return false; 2366 2367 NamedDecl *Child = Field; 2368 do { 2369 if (Parent->isUnion()) { 2370 UnionEntry &En = Unions[Parent]; 2371 if (En.first && En.first != Child) { 2372 S.Diag(Init->getSourceLocation(), 2373 diag::err_multiple_mem_union_initialization) 2374 << Field->getDeclName() 2375 << Init->getSourceRange(); 2376 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2377 << 0 << En.second->getSourceRange(); 2378 return true; 2379 } else if (!En.first) { 2380 En.first = Child; 2381 En.second = Init; 2382 } 2383 } 2384 2385 Child = Parent; 2386 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2387 } while (Parent->isAnonymousStructOrUnion()); 2388 2389 return false; 2390} 2391} 2392 2393/// ActOnMemInitializers - Handle the member initializers for a constructor. 2394void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2395 SourceLocation ColonLoc, 2396 MemInitTy **meminits, unsigned NumMemInits, 2397 bool AnyErrors) { 2398 if (!ConstructorDecl) 2399 return; 2400 2401 AdjustDeclIfTemplate(ConstructorDecl); 2402 2403 CXXConstructorDecl *Constructor 2404 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2405 2406 if (!Constructor) { 2407 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2408 return; 2409 } 2410 2411 CXXCtorInitializer **MemInits = 2412 reinterpret_cast<CXXCtorInitializer **>(meminits); 2413 2414 // Mapping for the duplicate initializers check. 2415 // For member initializers, this is keyed with a FieldDecl*. 2416 // For base initializers, this is keyed with a Type*. 2417 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2418 2419 // Mapping for the inconsistent anonymous-union initializers check. 2420 RedundantUnionMap MemberUnions; 2421 2422 bool HadError = false; 2423 for (unsigned i = 0; i < NumMemInits; i++) { 2424 CXXCtorInitializer *Init = MemInits[i]; 2425 2426 // Set the source order index. 2427 Init->setSourceOrder(i); 2428 2429 if (Init->isAnyMemberInitializer()) { 2430 FieldDecl *Field = Init->getAnyMember(); 2431 if (CheckRedundantInit(*this, Init, Members[Field]) || 2432 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2433 HadError = true; 2434 } else if (Init->isBaseInitializer()) { 2435 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2436 if (CheckRedundantInit(*this, Init, Members[Key])) 2437 HadError = true; 2438 } else { 2439 assert(Init->isDelegatingInitializer()); 2440 // This must be the only initializer 2441 if (i != 0 || NumMemInits > 1) { 2442 Diag(MemInits[0]->getSourceLocation(), 2443 diag::err_delegating_initializer_alone) 2444 << MemInits[0]->getSourceRange(); 2445 HadError = true; 2446 } 2447 } 2448 } 2449 2450 if (HadError) 2451 return; 2452 2453 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2454 2455 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2456} 2457 2458void 2459Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2460 CXXRecordDecl *ClassDecl) { 2461 // Ignore dependent contexts. 2462 if (ClassDecl->isDependentContext()) 2463 return; 2464 2465 // FIXME: all the access-control diagnostics are positioned on the 2466 // field/base declaration. That's probably good; that said, the 2467 // user might reasonably want to know why the destructor is being 2468 // emitted, and we currently don't say. 2469 2470 // Non-static data members. 2471 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2472 E = ClassDecl->field_end(); I != E; ++I) { 2473 FieldDecl *Field = *I; 2474 if (Field->isInvalidDecl()) 2475 continue; 2476 QualType FieldType = Context.getBaseElementType(Field->getType()); 2477 2478 const RecordType* RT = FieldType->getAs<RecordType>(); 2479 if (!RT) 2480 continue; 2481 2482 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2483 if (FieldClassDecl->hasTrivialDestructor()) 2484 continue; 2485 2486 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2487 CheckDestructorAccess(Field->getLocation(), Dtor, 2488 PDiag(diag::err_access_dtor_field) 2489 << Field->getDeclName() 2490 << FieldType); 2491 2492 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2493 } 2494 2495 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2496 2497 // Bases. 2498 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2499 E = ClassDecl->bases_end(); Base != E; ++Base) { 2500 // Bases are always records in a well-formed non-dependent class. 2501 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2502 2503 // Remember direct virtual bases. 2504 if (Base->isVirtual()) 2505 DirectVirtualBases.insert(RT); 2506 2507 // Ignore trivial destructors. 2508 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2509 if (BaseClassDecl->hasTrivialDestructor()) 2510 continue; 2511 2512 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2513 2514 // FIXME: caret should be on the start of the class name 2515 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2516 PDiag(diag::err_access_dtor_base) 2517 << Base->getType() 2518 << Base->getSourceRange()); 2519 2520 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2521 } 2522 2523 // Virtual bases. 2524 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2525 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2526 2527 // Bases are always records in a well-formed non-dependent class. 2528 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2529 2530 // Ignore direct virtual bases. 2531 if (DirectVirtualBases.count(RT)) 2532 continue; 2533 2534 // Ignore trivial destructors. 2535 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2536 if (BaseClassDecl->hasTrivialDestructor()) 2537 continue; 2538 2539 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2540 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2541 PDiag(diag::err_access_dtor_vbase) 2542 << VBase->getType()); 2543 2544 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2545 } 2546} 2547 2548void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2549 if (!CDtorDecl) 2550 return; 2551 2552 if (CXXConstructorDecl *Constructor 2553 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2554 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2555} 2556 2557bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2558 unsigned DiagID, AbstractDiagSelID SelID) { 2559 if (SelID == -1) 2560 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2561 else 2562 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2563} 2564 2565bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2566 const PartialDiagnostic &PD) { 2567 if (!getLangOptions().CPlusPlus) 2568 return false; 2569 2570 if (const ArrayType *AT = Context.getAsArrayType(T)) 2571 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2572 2573 if (const PointerType *PT = T->getAs<PointerType>()) { 2574 // Find the innermost pointer type. 2575 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2576 PT = T; 2577 2578 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2579 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2580 } 2581 2582 const RecordType *RT = T->getAs<RecordType>(); 2583 if (!RT) 2584 return false; 2585 2586 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2587 2588 // We can't answer whether something is abstract until it has a 2589 // definition. If it's currently being defined, we'll walk back 2590 // over all the declarations when we have a full definition. 2591 const CXXRecordDecl *Def = RD->getDefinition(); 2592 if (!Def || Def->isBeingDefined()) 2593 return false; 2594 2595 if (!RD->isAbstract()) 2596 return false; 2597 2598 Diag(Loc, PD) << RD->getDeclName(); 2599 DiagnoseAbstractType(RD); 2600 2601 return true; 2602} 2603 2604void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2605 // Check if we've already emitted the list of pure virtual functions 2606 // for this class. 2607 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2608 return; 2609 2610 CXXFinalOverriderMap FinalOverriders; 2611 RD->getFinalOverriders(FinalOverriders); 2612 2613 // Keep a set of seen pure methods so we won't diagnose the same method 2614 // more than once. 2615 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2616 2617 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2618 MEnd = FinalOverriders.end(); 2619 M != MEnd; 2620 ++M) { 2621 for (OverridingMethods::iterator SO = M->second.begin(), 2622 SOEnd = M->second.end(); 2623 SO != SOEnd; ++SO) { 2624 // C++ [class.abstract]p4: 2625 // A class is abstract if it contains or inherits at least one 2626 // pure virtual function for which the final overrider is pure 2627 // virtual. 2628 2629 // 2630 if (SO->second.size() != 1) 2631 continue; 2632 2633 if (!SO->second.front().Method->isPure()) 2634 continue; 2635 2636 if (!SeenPureMethods.insert(SO->second.front().Method)) 2637 continue; 2638 2639 Diag(SO->second.front().Method->getLocation(), 2640 diag::note_pure_virtual_function) 2641 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2642 } 2643 } 2644 2645 if (!PureVirtualClassDiagSet) 2646 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2647 PureVirtualClassDiagSet->insert(RD); 2648} 2649 2650namespace { 2651struct AbstractUsageInfo { 2652 Sema &S; 2653 CXXRecordDecl *Record; 2654 CanQualType AbstractType; 2655 bool Invalid; 2656 2657 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2658 : S(S), Record(Record), 2659 AbstractType(S.Context.getCanonicalType( 2660 S.Context.getTypeDeclType(Record))), 2661 Invalid(false) {} 2662 2663 void DiagnoseAbstractType() { 2664 if (Invalid) return; 2665 S.DiagnoseAbstractType(Record); 2666 Invalid = true; 2667 } 2668 2669 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2670}; 2671 2672struct CheckAbstractUsage { 2673 AbstractUsageInfo &Info; 2674 const NamedDecl *Ctx; 2675 2676 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2677 : Info(Info), Ctx(Ctx) {} 2678 2679 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2680 switch (TL.getTypeLocClass()) { 2681#define ABSTRACT_TYPELOC(CLASS, PARENT) 2682#define TYPELOC(CLASS, PARENT) \ 2683 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2684#include "clang/AST/TypeLocNodes.def" 2685 } 2686 } 2687 2688 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2689 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2690 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2691 if (!TL.getArg(I)) 2692 continue; 2693 2694 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2695 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2696 } 2697 } 2698 2699 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2700 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2701 } 2702 2703 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2704 // Visit the type parameters from a permissive context. 2705 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2706 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2707 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2708 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2709 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2710 // TODO: other template argument types? 2711 } 2712 } 2713 2714 // Visit pointee types from a permissive context. 2715#define CheckPolymorphic(Type) \ 2716 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2717 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2718 } 2719 CheckPolymorphic(PointerTypeLoc) 2720 CheckPolymorphic(ReferenceTypeLoc) 2721 CheckPolymorphic(MemberPointerTypeLoc) 2722 CheckPolymorphic(BlockPointerTypeLoc) 2723 2724 /// Handle all the types we haven't given a more specific 2725 /// implementation for above. 2726 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2727 // Every other kind of type that we haven't called out already 2728 // that has an inner type is either (1) sugar or (2) contains that 2729 // inner type in some way as a subobject. 2730 if (TypeLoc Next = TL.getNextTypeLoc()) 2731 return Visit(Next, Sel); 2732 2733 // If there's no inner type and we're in a permissive context, 2734 // don't diagnose. 2735 if (Sel == Sema::AbstractNone) return; 2736 2737 // Check whether the type matches the abstract type. 2738 QualType T = TL.getType(); 2739 if (T->isArrayType()) { 2740 Sel = Sema::AbstractArrayType; 2741 T = Info.S.Context.getBaseElementType(T); 2742 } 2743 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2744 if (CT != Info.AbstractType) return; 2745 2746 // It matched; do some magic. 2747 if (Sel == Sema::AbstractArrayType) { 2748 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2749 << T << TL.getSourceRange(); 2750 } else { 2751 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2752 << Sel << T << TL.getSourceRange(); 2753 } 2754 Info.DiagnoseAbstractType(); 2755 } 2756}; 2757 2758void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2759 Sema::AbstractDiagSelID Sel) { 2760 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2761} 2762 2763} 2764 2765/// Check for invalid uses of an abstract type in a method declaration. 2766static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2767 CXXMethodDecl *MD) { 2768 // No need to do the check on definitions, which require that 2769 // the return/param types be complete. 2770 if (MD->isThisDeclarationADefinition()) 2771 return; 2772 2773 // For safety's sake, just ignore it if we don't have type source 2774 // information. This should never happen for non-implicit methods, 2775 // but... 2776 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2777 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2778} 2779 2780/// Check for invalid uses of an abstract type within a class definition. 2781static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2782 CXXRecordDecl *RD) { 2783 for (CXXRecordDecl::decl_iterator 2784 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2785 Decl *D = *I; 2786 if (D->isImplicit()) continue; 2787 2788 // Methods and method templates. 2789 if (isa<CXXMethodDecl>(D)) { 2790 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2791 } else if (isa<FunctionTemplateDecl>(D)) { 2792 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2793 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2794 2795 // Fields and static variables. 2796 } else if (isa<FieldDecl>(D)) { 2797 FieldDecl *FD = cast<FieldDecl>(D); 2798 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2799 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2800 } else if (isa<VarDecl>(D)) { 2801 VarDecl *VD = cast<VarDecl>(D); 2802 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2803 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2804 2805 // Nested classes and class templates. 2806 } else if (isa<CXXRecordDecl>(D)) { 2807 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2808 } else if (isa<ClassTemplateDecl>(D)) { 2809 CheckAbstractClassUsage(Info, 2810 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2811 } 2812 } 2813} 2814 2815/// \brief Perform semantic checks on a class definition that has been 2816/// completing, introducing implicitly-declared members, checking for 2817/// abstract types, etc. 2818void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2819 if (!Record) 2820 return; 2821 2822 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2823 AbstractUsageInfo Info(*this, Record); 2824 CheckAbstractClassUsage(Info, Record); 2825 } 2826 2827 // If this is not an aggregate type and has no user-declared constructor, 2828 // complain about any non-static data members of reference or const scalar 2829 // type, since they will never get initializers. 2830 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2831 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2832 bool Complained = false; 2833 for (RecordDecl::field_iterator F = Record->field_begin(), 2834 FEnd = Record->field_end(); 2835 F != FEnd; ++F) { 2836 if (F->getType()->isReferenceType() || 2837 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2838 if (!Complained) { 2839 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2840 << Record->getTagKind() << Record; 2841 Complained = true; 2842 } 2843 2844 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2845 << F->getType()->isReferenceType() 2846 << F->getDeclName(); 2847 } 2848 } 2849 } 2850 2851 if (Record->isDynamicClass() && !Record->isDependentType()) 2852 DynamicClasses.push_back(Record); 2853 2854 if (Record->getIdentifier()) { 2855 // C++ [class.mem]p13: 2856 // If T is the name of a class, then each of the following shall have a 2857 // name different from T: 2858 // - every member of every anonymous union that is a member of class T. 2859 // 2860 // C++ [class.mem]p14: 2861 // In addition, if class T has a user-declared constructor (12.1), every 2862 // non-static data member of class T shall have a name different from T. 2863 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2864 R.first != R.second; ++R.first) { 2865 NamedDecl *D = *R.first; 2866 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2867 isa<IndirectFieldDecl>(D)) { 2868 Diag(D->getLocation(), diag::err_member_name_of_class) 2869 << D->getDeclName(); 2870 break; 2871 } 2872 } 2873 } 2874 2875 // Warn if the class has virtual methods but non-virtual public destructor. 2876 if (Record->isPolymorphic() && !Record->isDependentType()) { 2877 CXXDestructorDecl *dtor = Record->getDestructor(); 2878 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2879 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2880 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2881 } 2882 2883 // See if a method overloads virtual methods in a base 2884 /// class without overriding any. 2885 if (!Record->isDependentType()) { 2886 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2887 MEnd = Record->method_end(); 2888 M != MEnd; ++M) { 2889 if (!(*M)->isStatic()) 2890 DiagnoseHiddenVirtualMethods(Record, *M); 2891 } 2892 } 2893 2894 // Declare inherited constructors. We do this eagerly here because: 2895 // - The standard requires an eager diagnostic for conflicting inherited 2896 // constructors from different classes. 2897 // - The lazy declaration of the other implicit constructors is so as to not 2898 // waste space and performance on classes that are not meant to be 2899 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2900 // have inherited constructors. 2901 DeclareInheritedConstructors(Record); 2902} 2903 2904/// \brief Data used with FindHiddenVirtualMethod 2905namespace { 2906 struct FindHiddenVirtualMethodData { 2907 Sema *S; 2908 CXXMethodDecl *Method; 2909 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2910 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2911 }; 2912} 2913 2914/// \brief Member lookup function that determines whether a given C++ 2915/// method overloads virtual methods in a base class without overriding any, 2916/// to be used with CXXRecordDecl::lookupInBases(). 2917static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2918 CXXBasePath &Path, 2919 void *UserData) { 2920 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2921 2922 FindHiddenVirtualMethodData &Data 2923 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2924 2925 DeclarationName Name = Data.Method->getDeclName(); 2926 assert(Name.getNameKind() == DeclarationName::Identifier); 2927 2928 bool foundSameNameMethod = false; 2929 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2930 for (Path.Decls = BaseRecord->lookup(Name); 2931 Path.Decls.first != Path.Decls.second; 2932 ++Path.Decls.first) { 2933 NamedDecl *D = *Path.Decls.first; 2934 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2935 MD = MD->getCanonicalDecl(); 2936 foundSameNameMethod = true; 2937 // Interested only in hidden virtual methods. 2938 if (!MD->isVirtual()) 2939 continue; 2940 // If the method we are checking overrides a method from its base 2941 // don't warn about the other overloaded methods. 2942 if (!Data.S->IsOverload(Data.Method, MD, false)) 2943 return true; 2944 // Collect the overload only if its hidden. 2945 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2946 overloadedMethods.push_back(MD); 2947 } 2948 } 2949 2950 if (foundSameNameMethod) 2951 Data.OverloadedMethods.append(overloadedMethods.begin(), 2952 overloadedMethods.end()); 2953 return foundSameNameMethod; 2954} 2955 2956/// \brief See if a method overloads virtual methods in a base class without 2957/// overriding any. 2958void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2959 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2960 MD->getLocation()) == Diagnostic::Ignored) 2961 return; 2962 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2963 return; 2964 2965 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2966 /*bool RecordPaths=*/false, 2967 /*bool DetectVirtual=*/false); 2968 FindHiddenVirtualMethodData Data; 2969 Data.Method = MD; 2970 Data.S = this; 2971 2972 // Keep the base methods that were overriden or introduced in the subclass 2973 // by 'using' in a set. A base method not in this set is hidden. 2974 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2975 res.first != res.second; ++res.first) { 2976 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2977 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2978 E = MD->end_overridden_methods(); 2979 I != E; ++I) 2980 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2981 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2982 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2983 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2984 } 2985 2986 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2987 !Data.OverloadedMethods.empty()) { 2988 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2989 << MD << (Data.OverloadedMethods.size() > 1); 2990 2991 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2992 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2993 Diag(overloadedMD->getLocation(), 2994 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2995 } 2996 } 2997} 2998 2999void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3000 Decl *TagDecl, 3001 SourceLocation LBrac, 3002 SourceLocation RBrac, 3003 AttributeList *AttrList) { 3004 if (!TagDecl) 3005 return; 3006 3007 AdjustDeclIfTemplate(TagDecl); 3008 3009 ActOnFields(S, RLoc, TagDecl, 3010 // strict aliasing violation! 3011 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3012 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3013 3014 CheckCompletedCXXClass( 3015 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3016} 3017 3018namespace { 3019 /// \brief Helper class that collects exception specifications for 3020 /// implicitly-declared special member functions. 3021 class ImplicitExceptionSpecification { 3022 ASTContext &Context; 3023 // We order exception specifications thus: 3024 // noexcept is the most restrictive, but is only used in C++0x. 3025 // throw() comes next. 3026 // Then a throw(collected exceptions) 3027 // Finally no specification. 3028 // throw(...) is used instead if any called function uses it. 3029 ExceptionSpecificationType ComputedEST; 3030 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3031 llvm::SmallVector<QualType, 4> Exceptions; 3032 3033 void ClearExceptions() { 3034 ExceptionsSeen.clear(); 3035 Exceptions.clear(); 3036 } 3037 3038 public: 3039 explicit ImplicitExceptionSpecification(ASTContext &Context) 3040 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3041 if (!Context.getLangOptions().CPlusPlus0x) 3042 ComputedEST = EST_DynamicNone; 3043 } 3044 3045 /// \brief Get the computed exception specification type. 3046 ExceptionSpecificationType getExceptionSpecType() const { 3047 assert(ComputedEST != EST_ComputedNoexcept && 3048 "noexcept(expr) should not be a possible result"); 3049 return ComputedEST; 3050 } 3051 3052 /// \brief The number of exceptions in the exception specification. 3053 unsigned size() const { return Exceptions.size(); } 3054 3055 /// \brief The set of exceptions in the exception specification. 3056 const QualType *data() const { return Exceptions.data(); } 3057 3058 /// \brief Integrate another called method into the collected data. 3059 void CalledDecl(CXXMethodDecl *Method) { 3060 // If we have an MSAny spec already, don't bother. 3061 if (!Method || ComputedEST == EST_MSAny) 3062 return; 3063 3064 const FunctionProtoType *Proto 3065 = Method->getType()->getAs<FunctionProtoType>(); 3066 3067 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3068 3069 // If this function can throw any exceptions, make a note of that. 3070 if (EST == EST_MSAny || EST == EST_None) { 3071 ClearExceptions(); 3072 ComputedEST = EST; 3073 return; 3074 } 3075 3076 // If this function has a basic noexcept, it doesn't affect the outcome. 3077 if (EST == EST_BasicNoexcept) 3078 return; 3079 3080 // If we have a throw-all spec at this point, ignore the function. 3081 if (ComputedEST == EST_None) 3082 return; 3083 3084 // If we're still at noexcept(true) and there's a nothrow() callee, 3085 // change to that specification. 3086 if (EST == EST_DynamicNone) { 3087 if (ComputedEST == EST_BasicNoexcept) 3088 ComputedEST = EST_DynamicNone; 3089 return; 3090 } 3091 3092 // Check out noexcept specs. 3093 if (EST == EST_ComputedNoexcept) { 3094 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3095 assert(NR != FunctionProtoType::NR_NoNoexcept && 3096 "Must have noexcept result for EST_ComputedNoexcept."); 3097 assert(NR != FunctionProtoType::NR_Dependent && 3098 "Should not generate implicit declarations for dependent cases, " 3099 "and don't know how to handle them anyway."); 3100 3101 // noexcept(false) -> no spec on the new function 3102 if (NR == FunctionProtoType::NR_Throw) { 3103 ClearExceptions(); 3104 ComputedEST = EST_None; 3105 } 3106 // noexcept(true) won't change anything either. 3107 return; 3108 } 3109 3110 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3111 assert(ComputedEST != EST_None && 3112 "Shouldn't collect exceptions when throw-all is guaranteed."); 3113 ComputedEST = EST_Dynamic; 3114 // Record the exceptions in this function's exception specification. 3115 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3116 EEnd = Proto->exception_end(); 3117 E != EEnd; ++E) 3118 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3119 Exceptions.push_back(*E); 3120 } 3121 }; 3122} 3123 3124 3125/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3126/// special functions, such as the default constructor, copy 3127/// constructor, or destructor, to the given C++ class (C++ 3128/// [special]p1). This routine can only be executed just before the 3129/// definition of the class is complete. 3130void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3131 if (!ClassDecl->hasUserDeclaredConstructor()) 3132 ++ASTContext::NumImplicitDefaultConstructors; 3133 3134 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3135 ++ASTContext::NumImplicitCopyConstructors; 3136 3137 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3138 ++ASTContext::NumImplicitCopyAssignmentOperators; 3139 3140 // If we have a dynamic class, then the copy assignment operator may be 3141 // virtual, so we have to declare it immediately. This ensures that, e.g., 3142 // it shows up in the right place in the vtable and that we diagnose 3143 // problems with the implicit exception specification. 3144 if (ClassDecl->isDynamicClass()) 3145 DeclareImplicitCopyAssignment(ClassDecl); 3146 } 3147 3148 if (!ClassDecl->hasUserDeclaredDestructor()) { 3149 ++ASTContext::NumImplicitDestructors; 3150 3151 // If we have a dynamic class, then the destructor may be virtual, so we 3152 // have to declare the destructor immediately. This ensures that, e.g., it 3153 // shows up in the right place in the vtable and that we diagnose problems 3154 // with the implicit exception specification. 3155 if (ClassDecl->isDynamicClass()) 3156 DeclareImplicitDestructor(ClassDecl); 3157 } 3158} 3159 3160void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3161 if (!D) 3162 return; 3163 3164 TemplateParameterList *Params = 0; 3165 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3166 Params = Template->getTemplateParameters(); 3167 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3168 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3169 Params = PartialSpec->getTemplateParameters(); 3170 else 3171 return; 3172 3173 for (TemplateParameterList::iterator Param = Params->begin(), 3174 ParamEnd = Params->end(); 3175 Param != ParamEnd; ++Param) { 3176 NamedDecl *Named = cast<NamedDecl>(*Param); 3177 if (Named->getDeclName()) { 3178 S->AddDecl(Named); 3179 IdResolver.AddDecl(Named); 3180 } 3181 } 3182} 3183 3184void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3185 if (!RecordD) return; 3186 AdjustDeclIfTemplate(RecordD); 3187 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3188 PushDeclContext(S, Record); 3189} 3190 3191void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3192 if (!RecordD) return; 3193 PopDeclContext(); 3194} 3195 3196/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3197/// parsing a top-level (non-nested) C++ class, and we are now 3198/// parsing those parts of the given Method declaration that could 3199/// not be parsed earlier (C++ [class.mem]p2), such as default 3200/// arguments. This action should enter the scope of the given 3201/// Method declaration as if we had just parsed the qualified method 3202/// name. However, it should not bring the parameters into scope; 3203/// that will be performed by ActOnDelayedCXXMethodParameter. 3204void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3205} 3206 3207/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3208/// C++ method declaration. We're (re-)introducing the given 3209/// function parameter into scope for use in parsing later parts of 3210/// the method declaration. For example, we could see an 3211/// ActOnParamDefaultArgument event for this parameter. 3212void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3213 if (!ParamD) 3214 return; 3215 3216 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3217 3218 // If this parameter has an unparsed default argument, clear it out 3219 // to make way for the parsed default argument. 3220 if (Param->hasUnparsedDefaultArg()) 3221 Param->setDefaultArg(0); 3222 3223 S->AddDecl(Param); 3224 if (Param->getDeclName()) 3225 IdResolver.AddDecl(Param); 3226} 3227 3228/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3229/// processing the delayed method declaration for Method. The method 3230/// declaration is now considered finished. There may be a separate 3231/// ActOnStartOfFunctionDef action later (not necessarily 3232/// immediately!) for this method, if it was also defined inside the 3233/// class body. 3234void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3235 if (!MethodD) 3236 return; 3237 3238 AdjustDeclIfTemplate(MethodD); 3239 3240 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3241 3242 // Now that we have our default arguments, check the constructor 3243 // again. It could produce additional diagnostics or affect whether 3244 // the class has implicitly-declared destructors, among other 3245 // things. 3246 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3247 CheckConstructor(Constructor); 3248 3249 // Check the default arguments, which we may have added. 3250 if (!Method->isInvalidDecl()) 3251 CheckCXXDefaultArguments(Method); 3252} 3253 3254/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3255/// the well-formedness of the constructor declarator @p D with type @p 3256/// R. If there are any errors in the declarator, this routine will 3257/// emit diagnostics and set the invalid bit to true. In any case, the type 3258/// will be updated to reflect a well-formed type for the constructor and 3259/// returned. 3260QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3261 StorageClass &SC) { 3262 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3263 3264 // C++ [class.ctor]p3: 3265 // A constructor shall not be virtual (10.3) or static (9.4). A 3266 // constructor can be invoked for a const, volatile or const 3267 // volatile object. A constructor shall not be declared const, 3268 // volatile, or const volatile (9.3.2). 3269 if (isVirtual) { 3270 if (!D.isInvalidType()) 3271 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3272 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3273 << SourceRange(D.getIdentifierLoc()); 3274 D.setInvalidType(); 3275 } 3276 if (SC == SC_Static) { 3277 if (!D.isInvalidType()) 3278 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3279 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3280 << SourceRange(D.getIdentifierLoc()); 3281 D.setInvalidType(); 3282 SC = SC_None; 3283 } 3284 3285 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3286 if (FTI.TypeQuals != 0) { 3287 if (FTI.TypeQuals & Qualifiers::Const) 3288 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3289 << "const" << SourceRange(D.getIdentifierLoc()); 3290 if (FTI.TypeQuals & Qualifiers::Volatile) 3291 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3292 << "volatile" << SourceRange(D.getIdentifierLoc()); 3293 if (FTI.TypeQuals & Qualifiers::Restrict) 3294 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3295 << "restrict" << SourceRange(D.getIdentifierLoc()); 3296 D.setInvalidType(); 3297 } 3298 3299 // C++0x [class.ctor]p4: 3300 // A constructor shall not be declared with a ref-qualifier. 3301 if (FTI.hasRefQualifier()) { 3302 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3303 << FTI.RefQualifierIsLValueRef 3304 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3305 D.setInvalidType(); 3306 } 3307 3308 // Rebuild the function type "R" without any type qualifiers (in 3309 // case any of the errors above fired) and with "void" as the 3310 // return type, since constructors don't have return types. 3311 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3312 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3313 return R; 3314 3315 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3316 EPI.TypeQuals = 0; 3317 EPI.RefQualifier = RQ_None; 3318 3319 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3320 Proto->getNumArgs(), EPI); 3321} 3322 3323/// CheckConstructor - Checks a fully-formed constructor for 3324/// well-formedness, issuing any diagnostics required. Returns true if 3325/// the constructor declarator is invalid. 3326void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3327 CXXRecordDecl *ClassDecl 3328 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3329 if (!ClassDecl) 3330 return Constructor->setInvalidDecl(); 3331 3332 // C++ [class.copy]p3: 3333 // A declaration of a constructor for a class X is ill-formed if 3334 // its first parameter is of type (optionally cv-qualified) X and 3335 // either there are no other parameters or else all other 3336 // parameters have default arguments. 3337 if (!Constructor->isInvalidDecl() && 3338 ((Constructor->getNumParams() == 1) || 3339 (Constructor->getNumParams() > 1 && 3340 Constructor->getParamDecl(1)->hasDefaultArg())) && 3341 Constructor->getTemplateSpecializationKind() 3342 != TSK_ImplicitInstantiation) { 3343 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3344 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3345 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3346 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3347 const char *ConstRef 3348 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3349 : " const &"; 3350 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3351 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3352 3353 // FIXME: Rather that making the constructor invalid, we should endeavor 3354 // to fix the type. 3355 Constructor->setInvalidDecl(); 3356 } 3357 } 3358} 3359 3360/// CheckDestructor - Checks a fully-formed destructor definition for 3361/// well-formedness, issuing any diagnostics required. Returns true 3362/// on error. 3363bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3364 CXXRecordDecl *RD = Destructor->getParent(); 3365 3366 if (Destructor->isVirtual()) { 3367 SourceLocation Loc; 3368 3369 if (!Destructor->isImplicit()) 3370 Loc = Destructor->getLocation(); 3371 else 3372 Loc = RD->getLocation(); 3373 3374 // If we have a virtual destructor, look up the deallocation function 3375 FunctionDecl *OperatorDelete = 0; 3376 DeclarationName Name = 3377 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3378 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3379 return true; 3380 3381 MarkDeclarationReferenced(Loc, OperatorDelete); 3382 3383 Destructor->setOperatorDelete(OperatorDelete); 3384 } 3385 3386 return false; 3387} 3388 3389static inline bool 3390FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3391 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3392 FTI.ArgInfo[0].Param && 3393 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3394} 3395 3396/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3397/// the well-formednes of the destructor declarator @p D with type @p 3398/// R. If there are any errors in the declarator, this routine will 3399/// emit diagnostics and set the declarator to invalid. Even if this happens, 3400/// will be updated to reflect a well-formed type for the destructor and 3401/// returned. 3402QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3403 StorageClass& SC) { 3404 // C++ [class.dtor]p1: 3405 // [...] A typedef-name that names a class is a class-name 3406 // (7.1.3); however, a typedef-name that names a class shall not 3407 // be used as the identifier in the declarator for a destructor 3408 // declaration. 3409 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3410 if (isa<TypedefType>(DeclaratorType)) 3411 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3412 << DeclaratorType; 3413 3414 // C++ [class.dtor]p2: 3415 // A destructor is used to destroy objects of its class type. A 3416 // destructor takes no parameters, and no return type can be 3417 // specified for it (not even void). The address of a destructor 3418 // shall not be taken. A destructor shall not be static. A 3419 // destructor can be invoked for a const, volatile or const 3420 // volatile object. A destructor shall not be declared const, 3421 // volatile or const volatile (9.3.2). 3422 if (SC == SC_Static) { 3423 if (!D.isInvalidType()) 3424 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3425 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3426 << SourceRange(D.getIdentifierLoc()) 3427 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3428 3429 SC = SC_None; 3430 } 3431 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3432 // Destructors don't have return types, but the parser will 3433 // happily parse something like: 3434 // 3435 // class X { 3436 // float ~X(); 3437 // }; 3438 // 3439 // The return type will be eliminated later. 3440 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3441 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3442 << SourceRange(D.getIdentifierLoc()); 3443 } 3444 3445 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3446 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3447 if (FTI.TypeQuals & Qualifiers::Const) 3448 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3449 << "const" << SourceRange(D.getIdentifierLoc()); 3450 if (FTI.TypeQuals & Qualifiers::Volatile) 3451 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3452 << "volatile" << SourceRange(D.getIdentifierLoc()); 3453 if (FTI.TypeQuals & Qualifiers::Restrict) 3454 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3455 << "restrict" << SourceRange(D.getIdentifierLoc()); 3456 D.setInvalidType(); 3457 } 3458 3459 // C++0x [class.dtor]p2: 3460 // A destructor shall not be declared with a ref-qualifier. 3461 if (FTI.hasRefQualifier()) { 3462 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3463 << FTI.RefQualifierIsLValueRef 3464 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3465 D.setInvalidType(); 3466 } 3467 3468 // Make sure we don't have any parameters. 3469 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3470 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3471 3472 // Delete the parameters. 3473 FTI.freeArgs(); 3474 D.setInvalidType(); 3475 } 3476 3477 // Make sure the destructor isn't variadic. 3478 if (FTI.isVariadic) { 3479 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3480 D.setInvalidType(); 3481 } 3482 3483 // Rebuild the function type "R" without any type qualifiers or 3484 // parameters (in case any of the errors above fired) and with 3485 // "void" as the return type, since destructors don't have return 3486 // types. 3487 if (!D.isInvalidType()) 3488 return R; 3489 3490 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3491 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3492 EPI.Variadic = false; 3493 EPI.TypeQuals = 0; 3494 EPI.RefQualifier = RQ_None; 3495 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3496} 3497 3498/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3499/// well-formednes of the conversion function declarator @p D with 3500/// type @p R. If there are any errors in the declarator, this routine 3501/// will emit diagnostics and return true. Otherwise, it will return 3502/// false. Either way, the type @p R will be updated to reflect a 3503/// well-formed type for the conversion operator. 3504void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3505 StorageClass& SC) { 3506 // C++ [class.conv.fct]p1: 3507 // Neither parameter types nor return type can be specified. The 3508 // type of a conversion function (8.3.5) is "function taking no 3509 // parameter returning conversion-type-id." 3510 if (SC == SC_Static) { 3511 if (!D.isInvalidType()) 3512 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3513 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3514 << SourceRange(D.getIdentifierLoc()); 3515 D.setInvalidType(); 3516 SC = SC_None; 3517 } 3518 3519 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3520 3521 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3522 // Conversion functions don't have return types, but the parser will 3523 // happily parse something like: 3524 // 3525 // class X { 3526 // float operator bool(); 3527 // }; 3528 // 3529 // The return type will be changed later anyway. 3530 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3531 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3532 << SourceRange(D.getIdentifierLoc()); 3533 D.setInvalidType(); 3534 } 3535 3536 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3537 3538 // Make sure we don't have any parameters. 3539 if (Proto->getNumArgs() > 0) { 3540 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3541 3542 // Delete the parameters. 3543 D.getFunctionTypeInfo().freeArgs(); 3544 D.setInvalidType(); 3545 } else if (Proto->isVariadic()) { 3546 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3547 D.setInvalidType(); 3548 } 3549 3550 // Diagnose "&operator bool()" and other such nonsense. This 3551 // is actually a gcc extension which we don't support. 3552 if (Proto->getResultType() != ConvType) { 3553 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3554 << Proto->getResultType(); 3555 D.setInvalidType(); 3556 ConvType = Proto->getResultType(); 3557 } 3558 3559 // C++ [class.conv.fct]p4: 3560 // The conversion-type-id shall not represent a function type nor 3561 // an array type. 3562 if (ConvType->isArrayType()) { 3563 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3564 ConvType = Context.getPointerType(ConvType); 3565 D.setInvalidType(); 3566 } else if (ConvType->isFunctionType()) { 3567 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3568 ConvType = Context.getPointerType(ConvType); 3569 D.setInvalidType(); 3570 } 3571 3572 // Rebuild the function type "R" without any parameters (in case any 3573 // of the errors above fired) and with the conversion type as the 3574 // return type. 3575 if (D.isInvalidType()) 3576 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3577 3578 // C++0x explicit conversion operators. 3579 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3580 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3581 diag::warn_explicit_conversion_functions) 3582 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3583} 3584 3585/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3586/// the declaration of the given C++ conversion function. This routine 3587/// is responsible for recording the conversion function in the C++ 3588/// class, if possible. 3589Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3590 assert(Conversion && "Expected to receive a conversion function declaration"); 3591 3592 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3593 3594 // Make sure we aren't redeclaring the conversion function. 3595 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3596 3597 // C++ [class.conv.fct]p1: 3598 // [...] A conversion function is never used to convert a 3599 // (possibly cv-qualified) object to the (possibly cv-qualified) 3600 // same object type (or a reference to it), to a (possibly 3601 // cv-qualified) base class of that type (or a reference to it), 3602 // or to (possibly cv-qualified) void. 3603 // FIXME: Suppress this warning if the conversion function ends up being a 3604 // virtual function that overrides a virtual function in a base class. 3605 QualType ClassType 3606 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3607 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3608 ConvType = ConvTypeRef->getPointeeType(); 3609 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3610 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3611 /* Suppress diagnostics for instantiations. */; 3612 else if (ConvType->isRecordType()) { 3613 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3614 if (ConvType == ClassType) 3615 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3616 << ClassType; 3617 else if (IsDerivedFrom(ClassType, ConvType)) 3618 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3619 << ClassType << ConvType; 3620 } else if (ConvType->isVoidType()) { 3621 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3622 << ClassType << ConvType; 3623 } 3624 3625 if (FunctionTemplateDecl *ConversionTemplate 3626 = Conversion->getDescribedFunctionTemplate()) 3627 return ConversionTemplate; 3628 3629 return Conversion; 3630} 3631 3632//===----------------------------------------------------------------------===// 3633// Namespace Handling 3634//===----------------------------------------------------------------------===// 3635 3636 3637 3638/// ActOnStartNamespaceDef - This is called at the start of a namespace 3639/// definition. 3640Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3641 SourceLocation InlineLoc, 3642 SourceLocation NamespaceLoc, 3643 SourceLocation IdentLoc, 3644 IdentifierInfo *II, 3645 SourceLocation LBrace, 3646 AttributeList *AttrList) { 3647 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3648 // For anonymous namespace, take the location of the left brace. 3649 SourceLocation Loc = II ? IdentLoc : LBrace; 3650 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3651 StartLoc, Loc, II); 3652 Namespc->setInline(InlineLoc.isValid()); 3653 3654 Scope *DeclRegionScope = NamespcScope->getParent(); 3655 3656 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3657 3658 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3659 PushNamespaceVisibilityAttr(Attr); 3660 3661 if (II) { 3662 // C++ [namespace.def]p2: 3663 // The identifier in an original-namespace-definition shall not 3664 // have been previously defined in the declarative region in 3665 // which the original-namespace-definition appears. The 3666 // identifier in an original-namespace-definition is the name of 3667 // the namespace. Subsequently in that declarative region, it is 3668 // treated as an original-namespace-name. 3669 // 3670 // Since namespace names are unique in their scope, and we don't 3671 // look through using directives, just 3672 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3673 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3674 3675 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3676 // This is an extended namespace definition. 3677 if (Namespc->isInline() != OrigNS->isInline()) { 3678 // inline-ness must match 3679 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3680 << Namespc->isInline(); 3681 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3682 Namespc->setInvalidDecl(); 3683 // Recover by ignoring the new namespace's inline status. 3684 Namespc->setInline(OrigNS->isInline()); 3685 } 3686 3687 // Attach this namespace decl to the chain of extended namespace 3688 // definitions. 3689 OrigNS->setNextNamespace(Namespc); 3690 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3691 3692 // Remove the previous declaration from the scope. 3693 if (DeclRegionScope->isDeclScope(OrigNS)) { 3694 IdResolver.RemoveDecl(OrigNS); 3695 DeclRegionScope->RemoveDecl(OrigNS); 3696 } 3697 } else if (PrevDecl) { 3698 // This is an invalid name redefinition. 3699 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3700 << Namespc->getDeclName(); 3701 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3702 Namespc->setInvalidDecl(); 3703 // Continue on to push Namespc as current DeclContext and return it. 3704 } else if (II->isStr("std") && 3705 CurContext->getRedeclContext()->isTranslationUnit()) { 3706 // This is the first "real" definition of the namespace "std", so update 3707 // our cache of the "std" namespace to point at this definition. 3708 if (NamespaceDecl *StdNS = getStdNamespace()) { 3709 // We had already defined a dummy namespace "std". Link this new 3710 // namespace definition to the dummy namespace "std". 3711 StdNS->setNextNamespace(Namespc); 3712 StdNS->setLocation(IdentLoc); 3713 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3714 } 3715 3716 // Make our StdNamespace cache point at the first real definition of the 3717 // "std" namespace. 3718 StdNamespace = Namespc; 3719 } 3720 3721 PushOnScopeChains(Namespc, DeclRegionScope); 3722 } else { 3723 // Anonymous namespaces. 3724 assert(Namespc->isAnonymousNamespace()); 3725 3726 // Link the anonymous namespace into its parent. 3727 NamespaceDecl *PrevDecl; 3728 DeclContext *Parent = CurContext->getRedeclContext(); 3729 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3730 PrevDecl = TU->getAnonymousNamespace(); 3731 TU->setAnonymousNamespace(Namespc); 3732 } else { 3733 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3734 PrevDecl = ND->getAnonymousNamespace(); 3735 ND->setAnonymousNamespace(Namespc); 3736 } 3737 3738 // Link the anonymous namespace with its previous declaration. 3739 if (PrevDecl) { 3740 assert(PrevDecl->isAnonymousNamespace()); 3741 assert(!PrevDecl->getNextNamespace()); 3742 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3743 PrevDecl->setNextNamespace(Namespc); 3744 3745 if (Namespc->isInline() != PrevDecl->isInline()) { 3746 // inline-ness must match 3747 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3748 << Namespc->isInline(); 3749 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3750 Namespc->setInvalidDecl(); 3751 // Recover by ignoring the new namespace's inline status. 3752 Namespc->setInline(PrevDecl->isInline()); 3753 } 3754 } 3755 3756 CurContext->addDecl(Namespc); 3757 3758 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3759 // behaves as if it were replaced by 3760 // namespace unique { /* empty body */ } 3761 // using namespace unique; 3762 // namespace unique { namespace-body } 3763 // where all occurrences of 'unique' in a translation unit are 3764 // replaced by the same identifier and this identifier differs 3765 // from all other identifiers in the entire program. 3766 3767 // We just create the namespace with an empty name and then add an 3768 // implicit using declaration, just like the standard suggests. 3769 // 3770 // CodeGen enforces the "universally unique" aspect by giving all 3771 // declarations semantically contained within an anonymous 3772 // namespace internal linkage. 3773 3774 if (!PrevDecl) { 3775 UsingDirectiveDecl* UD 3776 = UsingDirectiveDecl::Create(Context, CurContext, 3777 /* 'using' */ LBrace, 3778 /* 'namespace' */ SourceLocation(), 3779 /* qualifier */ NestedNameSpecifierLoc(), 3780 /* identifier */ SourceLocation(), 3781 Namespc, 3782 /* Ancestor */ CurContext); 3783 UD->setImplicit(); 3784 CurContext->addDecl(UD); 3785 } 3786 } 3787 3788 // Although we could have an invalid decl (i.e. the namespace name is a 3789 // redefinition), push it as current DeclContext and try to continue parsing. 3790 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3791 // for the namespace has the declarations that showed up in that particular 3792 // namespace definition. 3793 PushDeclContext(NamespcScope, Namespc); 3794 return Namespc; 3795} 3796 3797/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3798/// is a namespace alias, returns the namespace it points to. 3799static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3800 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3801 return AD->getNamespace(); 3802 return dyn_cast_or_null<NamespaceDecl>(D); 3803} 3804 3805/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3806/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3807void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3808 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3809 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3810 Namespc->setRBraceLoc(RBrace); 3811 PopDeclContext(); 3812 if (Namespc->hasAttr<VisibilityAttr>()) 3813 PopPragmaVisibility(); 3814} 3815 3816CXXRecordDecl *Sema::getStdBadAlloc() const { 3817 return cast_or_null<CXXRecordDecl>( 3818 StdBadAlloc.get(Context.getExternalSource())); 3819} 3820 3821NamespaceDecl *Sema::getStdNamespace() const { 3822 return cast_or_null<NamespaceDecl>( 3823 StdNamespace.get(Context.getExternalSource())); 3824} 3825 3826/// \brief Retrieve the special "std" namespace, which may require us to 3827/// implicitly define the namespace. 3828NamespaceDecl *Sema::getOrCreateStdNamespace() { 3829 if (!StdNamespace) { 3830 // The "std" namespace has not yet been defined, so build one implicitly. 3831 StdNamespace = NamespaceDecl::Create(Context, 3832 Context.getTranslationUnitDecl(), 3833 SourceLocation(), SourceLocation(), 3834 &PP.getIdentifierTable().get("std")); 3835 getStdNamespace()->setImplicit(true); 3836 } 3837 3838 return getStdNamespace(); 3839} 3840 3841Decl *Sema::ActOnUsingDirective(Scope *S, 3842 SourceLocation UsingLoc, 3843 SourceLocation NamespcLoc, 3844 CXXScopeSpec &SS, 3845 SourceLocation IdentLoc, 3846 IdentifierInfo *NamespcName, 3847 AttributeList *AttrList) { 3848 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3849 assert(NamespcName && "Invalid NamespcName."); 3850 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3851 3852 // This can only happen along a recovery path. 3853 while (S->getFlags() & Scope::TemplateParamScope) 3854 S = S->getParent(); 3855 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3856 3857 UsingDirectiveDecl *UDir = 0; 3858 NestedNameSpecifier *Qualifier = 0; 3859 if (SS.isSet()) 3860 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3861 3862 // Lookup namespace name. 3863 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3864 LookupParsedName(R, S, &SS); 3865 if (R.isAmbiguous()) 3866 return 0; 3867 3868 if (R.empty()) { 3869 // Allow "using namespace std;" or "using namespace ::std;" even if 3870 // "std" hasn't been defined yet, for GCC compatibility. 3871 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3872 NamespcName->isStr("std")) { 3873 Diag(IdentLoc, diag::ext_using_undefined_std); 3874 R.addDecl(getOrCreateStdNamespace()); 3875 R.resolveKind(); 3876 } 3877 // Otherwise, attempt typo correction. 3878 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3879 CTC_NoKeywords, 0)) { 3880 if (R.getAsSingle<NamespaceDecl>() || 3881 R.getAsSingle<NamespaceAliasDecl>()) { 3882 if (DeclContext *DC = computeDeclContext(SS, false)) 3883 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3884 << NamespcName << DC << Corrected << SS.getRange() 3885 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3886 else 3887 Diag(IdentLoc, diag::err_using_directive_suggest) 3888 << NamespcName << Corrected 3889 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3890 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3891 << Corrected; 3892 3893 NamespcName = Corrected.getAsIdentifierInfo(); 3894 } else { 3895 R.clear(); 3896 R.setLookupName(NamespcName); 3897 } 3898 } 3899 } 3900 3901 if (!R.empty()) { 3902 NamedDecl *Named = R.getFoundDecl(); 3903 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3904 && "expected namespace decl"); 3905 // C++ [namespace.udir]p1: 3906 // A using-directive specifies that the names in the nominated 3907 // namespace can be used in the scope in which the 3908 // using-directive appears after the using-directive. During 3909 // unqualified name lookup (3.4.1), the names appear as if they 3910 // were declared in the nearest enclosing namespace which 3911 // contains both the using-directive and the nominated 3912 // namespace. [Note: in this context, "contains" means "contains 3913 // directly or indirectly". ] 3914 3915 // Find enclosing context containing both using-directive and 3916 // nominated namespace. 3917 NamespaceDecl *NS = getNamespaceDecl(Named); 3918 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3919 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3920 CommonAncestor = CommonAncestor->getParent(); 3921 3922 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3923 SS.getWithLocInContext(Context), 3924 IdentLoc, Named, CommonAncestor); 3925 3926 if (CurContext->getDeclKind() == Decl::TranslationUnit && 3927 !SourceMgr.isFromMainFile(IdentLoc)) { 3928 Diag(IdentLoc, diag::warn_using_directive_in_header); 3929 } 3930 3931 PushUsingDirective(S, UDir); 3932 } else { 3933 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3934 } 3935 3936 // FIXME: We ignore attributes for now. 3937 return UDir; 3938} 3939 3940void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3941 // If scope has associated entity, then using directive is at namespace 3942 // or translation unit scope. We add UsingDirectiveDecls, into 3943 // it's lookup structure. 3944 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3945 Ctx->addDecl(UDir); 3946 else 3947 // Otherwise it is block-sope. using-directives will affect lookup 3948 // only to the end of scope. 3949 S->PushUsingDirective(UDir); 3950} 3951 3952 3953Decl *Sema::ActOnUsingDeclaration(Scope *S, 3954 AccessSpecifier AS, 3955 bool HasUsingKeyword, 3956 SourceLocation UsingLoc, 3957 CXXScopeSpec &SS, 3958 UnqualifiedId &Name, 3959 AttributeList *AttrList, 3960 bool IsTypeName, 3961 SourceLocation TypenameLoc) { 3962 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3963 3964 switch (Name.getKind()) { 3965 case UnqualifiedId::IK_Identifier: 3966 case UnqualifiedId::IK_OperatorFunctionId: 3967 case UnqualifiedId::IK_LiteralOperatorId: 3968 case UnqualifiedId::IK_ConversionFunctionId: 3969 break; 3970 3971 case UnqualifiedId::IK_ConstructorName: 3972 case UnqualifiedId::IK_ConstructorTemplateId: 3973 // C++0x inherited constructors. 3974 if (getLangOptions().CPlusPlus0x) break; 3975 3976 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3977 << SS.getRange(); 3978 return 0; 3979 3980 case UnqualifiedId::IK_DestructorName: 3981 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3982 << SS.getRange(); 3983 return 0; 3984 3985 case UnqualifiedId::IK_TemplateId: 3986 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3987 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3988 return 0; 3989 } 3990 3991 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3992 DeclarationName TargetName = TargetNameInfo.getName(); 3993 if (!TargetName) 3994 return 0; 3995 3996 // Warn about using declarations. 3997 // TODO: store that the declaration was written without 'using' and 3998 // talk about access decls instead of using decls in the 3999 // diagnostics. 4000 if (!HasUsingKeyword) { 4001 UsingLoc = Name.getSourceRange().getBegin(); 4002 4003 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4004 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4005 } 4006 4007 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4008 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4009 return 0; 4010 4011 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4012 TargetNameInfo, AttrList, 4013 /* IsInstantiation */ false, 4014 IsTypeName, TypenameLoc); 4015 if (UD) 4016 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4017 4018 return UD; 4019} 4020 4021/// \brief Determine whether a using declaration considers the given 4022/// declarations as "equivalent", e.g., if they are redeclarations of 4023/// the same entity or are both typedefs of the same type. 4024static bool 4025IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4026 bool &SuppressRedeclaration) { 4027 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4028 SuppressRedeclaration = false; 4029 return true; 4030 } 4031 4032 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 4033 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 4034 SuppressRedeclaration = true; 4035 return Context.hasSameType(TD1->getUnderlyingType(), 4036 TD2->getUnderlyingType()); 4037 } 4038 4039 return false; 4040} 4041 4042 4043/// Determines whether to create a using shadow decl for a particular 4044/// decl, given the set of decls existing prior to this using lookup. 4045bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4046 const LookupResult &Previous) { 4047 // Diagnose finding a decl which is not from a base class of the 4048 // current class. We do this now because there are cases where this 4049 // function will silently decide not to build a shadow decl, which 4050 // will pre-empt further diagnostics. 4051 // 4052 // We don't need to do this in C++0x because we do the check once on 4053 // the qualifier. 4054 // 4055 // FIXME: diagnose the following if we care enough: 4056 // struct A { int foo; }; 4057 // struct B : A { using A::foo; }; 4058 // template <class T> struct C : A {}; 4059 // template <class T> struct D : C<T> { using B::foo; } // <--- 4060 // This is invalid (during instantiation) in C++03 because B::foo 4061 // resolves to the using decl in B, which is not a base class of D<T>. 4062 // We can't diagnose it immediately because C<T> is an unknown 4063 // specialization. The UsingShadowDecl in D<T> then points directly 4064 // to A::foo, which will look well-formed when we instantiate. 4065 // The right solution is to not collapse the shadow-decl chain. 4066 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4067 DeclContext *OrigDC = Orig->getDeclContext(); 4068 4069 // Handle enums and anonymous structs. 4070 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4071 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4072 while (OrigRec->isAnonymousStructOrUnion()) 4073 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4074 4075 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4076 if (OrigDC == CurContext) { 4077 Diag(Using->getLocation(), 4078 diag::err_using_decl_nested_name_specifier_is_current_class) 4079 << Using->getQualifierLoc().getSourceRange(); 4080 Diag(Orig->getLocation(), diag::note_using_decl_target); 4081 return true; 4082 } 4083 4084 Diag(Using->getQualifierLoc().getBeginLoc(), 4085 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4086 << Using->getQualifier() 4087 << cast<CXXRecordDecl>(CurContext) 4088 << Using->getQualifierLoc().getSourceRange(); 4089 Diag(Orig->getLocation(), diag::note_using_decl_target); 4090 return true; 4091 } 4092 } 4093 4094 if (Previous.empty()) return false; 4095 4096 NamedDecl *Target = Orig; 4097 if (isa<UsingShadowDecl>(Target)) 4098 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4099 4100 // If the target happens to be one of the previous declarations, we 4101 // don't have a conflict. 4102 // 4103 // FIXME: but we might be increasing its access, in which case we 4104 // should redeclare it. 4105 NamedDecl *NonTag = 0, *Tag = 0; 4106 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4107 I != E; ++I) { 4108 NamedDecl *D = (*I)->getUnderlyingDecl(); 4109 bool Result; 4110 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4111 return Result; 4112 4113 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4114 } 4115 4116 if (Target->isFunctionOrFunctionTemplate()) { 4117 FunctionDecl *FD; 4118 if (isa<FunctionTemplateDecl>(Target)) 4119 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4120 else 4121 FD = cast<FunctionDecl>(Target); 4122 4123 NamedDecl *OldDecl = 0; 4124 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4125 case Ovl_Overload: 4126 return false; 4127 4128 case Ovl_NonFunction: 4129 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4130 break; 4131 4132 // We found a decl with the exact signature. 4133 case Ovl_Match: 4134 // If we're in a record, we want to hide the target, so we 4135 // return true (without a diagnostic) to tell the caller not to 4136 // build a shadow decl. 4137 if (CurContext->isRecord()) 4138 return true; 4139 4140 // If we're not in a record, this is an error. 4141 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4142 break; 4143 } 4144 4145 Diag(Target->getLocation(), diag::note_using_decl_target); 4146 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4147 return true; 4148 } 4149 4150 // Target is not a function. 4151 4152 if (isa<TagDecl>(Target)) { 4153 // No conflict between a tag and a non-tag. 4154 if (!Tag) return false; 4155 4156 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4157 Diag(Target->getLocation(), diag::note_using_decl_target); 4158 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4159 return true; 4160 } 4161 4162 // No conflict between a tag and a non-tag. 4163 if (!NonTag) return false; 4164 4165 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4166 Diag(Target->getLocation(), diag::note_using_decl_target); 4167 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4168 return true; 4169} 4170 4171/// Builds a shadow declaration corresponding to a 'using' declaration. 4172UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4173 UsingDecl *UD, 4174 NamedDecl *Orig) { 4175 4176 // If we resolved to another shadow declaration, just coalesce them. 4177 NamedDecl *Target = Orig; 4178 if (isa<UsingShadowDecl>(Target)) { 4179 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4180 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4181 } 4182 4183 UsingShadowDecl *Shadow 4184 = UsingShadowDecl::Create(Context, CurContext, 4185 UD->getLocation(), UD, Target); 4186 UD->addShadowDecl(Shadow); 4187 4188 Shadow->setAccess(UD->getAccess()); 4189 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4190 Shadow->setInvalidDecl(); 4191 4192 if (S) 4193 PushOnScopeChains(Shadow, S); 4194 else 4195 CurContext->addDecl(Shadow); 4196 4197 4198 return Shadow; 4199} 4200 4201/// Hides a using shadow declaration. This is required by the current 4202/// using-decl implementation when a resolvable using declaration in a 4203/// class is followed by a declaration which would hide or override 4204/// one or more of the using decl's targets; for example: 4205/// 4206/// struct Base { void foo(int); }; 4207/// struct Derived : Base { 4208/// using Base::foo; 4209/// void foo(int); 4210/// }; 4211/// 4212/// The governing language is C++03 [namespace.udecl]p12: 4213/// 4214/// When a using-declaration brings names from a base class into a 4215/// derived class scope, member functions in the derived class 4216/// override and/or hide member functions with the same name and 4217/// parameter types in a base class (rather than conflicting). 4218/// 4219/// There are two ways to implement this: 4220/// (1) optimistically create shadow decls when they're not hidden 4221/// by existing declarations, or 4222/// (2) don't create any shadow decls (or at least don't make them 4223/// visible) until we've fully parsed/instantiated the class. 4224/// The problem with (1) is that we might have to retroactively remove 4225/// a shadow decl, which requires several O(n) operations because the 4226/// decl structures are (very reasonably) not designed for removal. 4227/// (2) avoids this but is very fiddly and phase-dependent. 4228void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4229 if (Shadow->getDeclName().getNameKind() == 4230 DeclarationName::CXXConversionFunctionName) 4231 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4232 4233 // Remove it from the DeclContext... 4234 Shadow->getDeclContext()->removeDecl(Shadow); 4235 4236 // ...and the scope, if applicable... 4237 if (S) { 4238 S->RemoveDecl(Shadow); 4239 IdResolver.RemoveDecl(Shadow); 4240 } 4241 4242 // ...and the using decl. 4243 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4244 4245 // TODO: complain somehow if Shadow was used. It shouldn't 4246 // be possible for this to happen, because...? 4247} 4248 4249/// Builds a using declaration. 4250/// 4251/// \param IsInstantiation - Whether this call arises from an 4252/// instantiation of an unresolved using declaration. We treat 4253/// the lookup differently for these declarations. 4254NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4255 SourceLocation UsingLoc, 4256 CXXScopeSpec &SS, 4257 const DeclarationNameInfo &NameInfo, 4258 AttributeList *AttrList, 4259 bool IsInstantiation, 4260 bool IsTypeName, 4261 SourceLocation TypenameLoc) { 4262 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4263 SourceLocation IdentLoc = NameInfo.getLoc(); 4264 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4265 4266 // FIXME: We ignore attributes for now. 4267 4268 if (SS.isEmpty()) { 4269 Diag(IdentLoc, diag::err_using_requires_qualname); 4270 return 0; 4271 } 4272 4273 // Do the redeclaration lookup in the current scope. 4274 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4275 ForRedeclaration); 4276 Previous.setHideTags(false); 4277 if (S) { 4278 LookupName(Previous, S); 4279 4280 // It is really dumb that we have to do this. 4281 LookupResult::Filter F = Previous.makeFilter(); 4282 while (F.hasNext()) { 4283 NamedDecl *D = F.next(); 4284 if (!isDeclInScope(D, CurContext, S)) 4285 F.erase(); 4286 } 4287 F.done(); 4288 } else { 4289 assert(IsInstantiation && "no scope in non-instantiation"); 4290 assert(CurContext->isRecord() && "scope not record in instantiation"); 4291 LookupQualifiedName(Previous, CurContext); 4292 } 4293 4294 // Check for invalid redeclarations. 4295 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4296 return 0; 4297 4298 // Check for bad qualifiers. 4299 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4300 return 0; 4301 4302 DeclContext *LookupContext = computeDeclContext(SS); 4303 NamedDecl *D; 4304 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4305 if (!LookupContext) { 4306 if (IsTypeName) { 4307 // FIXME: not all declaration name kinds are legal here 4308 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4309 UsingLoc, TypenameLoc, 4310 QualifierLoc, 4311 IdentLoc, NameInfo.getName()); 4312 } else { 4313 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4314 QualifierLoc, NameInfo); 4315 } 4316 } else { 4317 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4318 NameInfo, IsTypeName); 4319 } 4320 D->setAccess(AS); 4321 CurContext->addDecl(D); 4322 4323 if (!LookupContext) return D; 4324 UsingDecl *UD = cast<UsingDecl>(D); 4325 4326 if (RequireCompleteDeclContext(SS, LookupContext)) { 4327 UD->setInvalidDecl(); 4328 return UD; 4329 } 4330 4331 // Constructor inheriting using decls get special treatment. 4332 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4333 if (CheckInheritedConstructorUsingDecl(UD)) 4334 UD->setInvalidDecl(); 4335 return UD; 4336 } 4337 4338 // Otherwise, look up the target name. 4339 4340 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4341 4342 // Unlike most lookups, we don't always want to hide tag 4343 // declarations: tag names are visible through the using declaration 4344 // even if hidden by ordinary names, *except* in a dependent context 4345 // where it's important for the sanity of two-phase lookup. 4346 if (!IsInstantiation) 4347 R.setHideTags(false); 4348 4349 LookupQualifiedName(R, LookupContext); 4350 4351 if (R.empty()) { 4352 Diag(IdentLoc, diag::err_no_member) 4353 << NameInfo.getName() << LookupContext << SS.getRange(); 4354 UD->setInvalidDecl(); 4355 return UD; 4356 } 4357 4358 if (R.isAmbiguous()) { 4359 UD->setInvalidDecl(); 4360 return UD; 4361 } 4362 4363 if (IsTypeName) { 4364 // If we asked for a typename and got a non-type decl, error out. 4365 if (!R.getAsSingle<TypeDecl>()) { 4366 Diag(IdentLoc, diag::err_using_typename_non_type); 4367 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4368 Diag((*I)->getUnderlyingDecl()->getLocation(), 4369 diag::note_using_decl_target); 4370 UD->setInvalidDecl(); 4371 return UD; 4372 } 4373 } else { 4374 // If we asked for a non-typename and we got a type, error out, 4375 // but only if this is an instantiation of an unresolved using 4376 // decl. Otherwise just silently find the type name. 4377 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4378 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4379 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4380 UD->setInvalidDecl(); 4381 return UD; 4382 } 4383 } 4384 4385 // C++0x N2914 [namespace.udecl]p6: 4386 // A using-declaration shall not name a namespace. 4387 if (R.getAsSingle<NamespaceDecl>()) { 4388 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4389 << SS.getRange(); 4390 UD->setInvalidDecl(); 4391 return UD; 4392 } 4393 4394 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4395 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4396 BuildUsingShadowDecl(S, UD, *I); 4397 } 4398 4399 return UD; 4400} 4401 4402/// Additional checks for a using declaration referring to a constructor name. 4403bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4404 if (UD->isTypeName()) { 4405 // FIXME: Cannot specify typename when specifying constructor 4406 return true; 4407 } 4408 4409 const Type *SourceType = UD->getQualifier()->getAsType(); 4410 assert(SourceType && 4411 "Using decl naming constructor doesn't have type in scope spec."); 4412 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4413 4414 // Check whether the named type is a direct base class. 4415 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4416 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4417 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4418 BaseIt != BaseE; ++BaseIt) { 4419 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4420 if (CanonicalSourceType == BaseType) 4421 break; 4422 } 4423 4424 if (BaseIt == BaseE) { 4425 // Did not find SourceType in the bases. 4426 Diag(UD->getUsingLocation(), 4427 diag::err_using_decl_constructor_not_in_direct_base) 4428 << UD->getNameInfo().getSourceRange() 4429 << QualType(SourceType, 0) << TargetClass; 4430 return true; 4431 } 4432 4433 BaseIt->setInheritConstructors(); 4434 4435 return false; 4436} 4437 4438/// Checks that the given using declaration is not an invalid 4439/// redeclaration. Note that this is checking only for the using decl 4440/// itself, not for any ill-formedness among the UsingShadowDecls. 4441bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4442 bool isTypeName, 4443 const CXXScopeSpec &SS, 4444 SourceLocation NameLoc, 4445 const LookupResult &Prev) { 4446 // C++03 [namespace.udecl]p8: 4447 // C++0x [namespace.udecl]p10: 4448 // A using-declaration is a declaration and can therefore be used 4449 // repeatedly where (and only where) multiple declarations are 4450 // allowed. 4451 // 4452 // That's in non-member contexts. 4453 if (!CurContext->getRedeclContext()->isRecord()) 4454 return false; 4455 4456 NestedNameSpecifier *Qual 4457 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4458 4459 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4460 NamedDecl *D = *I; 4461 4462 bool DTypename; 4463 NestedNameSpecifier *DQual; 4464 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4465 DTypename = UD->isTypeName(); 4466 DQual = UD->getQualifier(); 4467 } else if (UnresolvedUsingValueDecl *UD 4468 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4469 DTypename = false; 4470 DQual = UD->getQualifier(); 4471 } else if (UnresolvedUsingTypenameDecl *UD 4472 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4473 DTypename = true; 4474 DQual = UD->getQualifier(); 4475 } else continue; 4476 4477 // using decls differ if one says 'typename' and the other doesn't. 4478 // FIXME: non-dependent using decls? 4479 if (isTypeName != DTypename) continue; 4480 4481 // using decls differ if they name different scopes (but note that 4482 // template instantiation can cause this check to trigger when it 4483 // didn't before instantiation). 4484 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4485 Context.getCanonicalNestedNameSpecifier(DQual)) 4486 continue; 4487 4488 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4489 Diag(D->getLocation(), diag::note_using_decl) << 1; 4490 return true; 4491 } 4492 4493 return false; 4494} 4495 4496 4497/// Checks that the given nested-name qualifier used in a using decl 4498/// in the current context is appropriately related to the current 4499/// scope. If an error is found, diagnoses it and returns true. 4500bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4501 const CXXScopeSpec &SS, 4502 SourceLocation NameLoc) { 4503 DeclContext *NamedContext = computeDeclContext(SS); 4504 4505 if (!CurContext->isRecord()) { 4506 // C++03 [namespace.udecl]p3: 4507 // C++0x [namespace.udecl]p8: 4508 // A using-declaration for a class member shall be a member-declaration. 4509 4510 // If we weren't able to compute a valid scope, it must be a 4511 // dependent class scope. 4512 if (!NamedContext || NamedContext->isRecord()) { 4513 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4514 << SS.getRange(); 4515 return true; 4516 } 4517 4518 // Otherwise, everything is known to be fine. 4519 return false; 4520 } 4521 4522 // The current scope is a record. 4523 4524 // If the named context is dependent, we can't decide much. 4525 if (!NamedContext) { 4526 // FIXME: in C++0x, we can diagnose if we can prove that the 4527 // nested-name-specifier does not refer to a base class, which is 4528 // still possible in some cases. 4529 4530 // Otherwise we have to conservatively report that things might be 4531 // okay. 4532 return false; 4533 } 4534 4535 if (!NamedContext->isRecord()) { 4536 // Ideally this would point at the last name in the specifier, 4537 // but we don't have that level of source info. 4538 Diag(SS.getRange().getBegin(), 4539 diag::err_using_decl_nested_name_specifier_is_not_class) 4540 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4541 return true; 4542 } 4543 4544 if (!NamedContext->isDependentContext() && 4545 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4546 return true; 4547 4548 if (getLangOptions().CPlusPlus0x) { 4549 // C++0x [namespace.udecl]p3: 4550 // In a using-declaration used as a member-declaration, the 4551 // nested-name-specifier shall name a base class of the class 4552 // being defined. 4553 4554 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4555 cast<CXXRecordDecl>(NamedContext))) { 4556 if (CurContext == NamedContext) { 4557 Diag(NameLoc, 4558 diag::err_using_decl_nested_name_specifier_is_current_class) 4559 << SS.getRange(); 4560 return true; 4561 } 4562 4563 Diag(SS.getRange().getBegin(), 4564 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4565 << (NestedNameSpecifier*) SS.getScopeRep() 4566 << cast<CXXRecordDecl>(CurContext) 4567 << SS.getRange(); 4568 return true; 4569 } 4570 4571 return false; 4572 } 4573 4574 // C++03 [namespace.udecl]p4: 4575 // A using-declaration used as a member-declaration shall refer 4576 // to a member of a base class of the class being defined [etc.]. 4577 4578 // Salient point: SS doesn't have to name a base class as long as 4579 // lookup only finds members from base classes. Therefore we can 4580 // diagnose here only if we can prove that that can't happen, 4581 // i.e. if the class hierarchies provably don't intersect. 4582 4583 // TODO: it would be nice if "definitely valid" results were cached 4584 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4585 // need to be repeated. 4586 4587 struct UserData { 4588 llvm::DenseSet<const CXXRecordDecl*> Bases; 4589 4590 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4591 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4592 Data->Bases.insert(Base); 4593 return true; 4594 } 4595 4596 bool hasDependentBases(const CXXRecordDecl *Class) { 4597 return !Class->forallBases(collect, this); 4598 } 4599 4600 /// Returns true if the base is dependent or is one of the 4601 /// accumulated base classes. 4602 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4603 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4604 return !Data->Bases.count(Base); 4605 } 4606 4607 bool mightShareBases(const CXXRecordDecl *Class) { 4608 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4609 } 4610 }; 4611 4612 UserData Data; 4613 4614 // Returns false if we find a dependent base. 4615 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4616 return false; 4617 4618 // Returns false if the class has a dependent base or if it or one 4619 // of its bases is present in the base set of the current context. 4620 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4621 return false; 4622 4623 Diag(SS.getRange().getBegin(), 4624 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4625 << (NestedNameSpecifier*) SS.getScopeRep() 4626 << cast<CXXRecordDecl>(CurContext) 4627 << SS.getRange(); 4628 4629 return true; 4630} 4631 4632Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4633 SourceLocation NamespaceLoc, 4634 SourceLocation AliasLoc, 4635 IdentifierInfo *Alias, 4636 CXXScopeSpec &SS, 4637 SourceLocation IdentLoc, 4638 IdentifierInfo *Ident) { 4639 4640 // Lookup the namespace name. 4641 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4642 LookupParsedName(R, S, &SS); 4643 4644 // Check if we have a previous declaration with the same name. 4645 NamedDecl *PrevDecl 4646 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4647 ForRedeclaration); 4648 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4649 PrevDecl = 0; 4650 4651 if (PrevDecl) { 4652 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4653 // We already have an alias with the same name that points to the same 4654 // namespace, so don't create a new one. 4655 // FIXME: At some point, we'll want to create the (redundant) 4656 // declaration to maintain better source information. 4657 if (!R.isAmbiguous() && !R.empty() && 4658 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4659 return 0; 4660 } 4661 4662 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4663 diag::err_redefinition_different_kind; 4664 Diag(AliasLoc, DiagID) << Alias; 4665 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4666 return 0; 4667 } 4668 4669 if (R.isAmbiguous()) 4670 return 0; 4671 4672 if (R.empty()) { 4673 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4674 CTC_NoKeywords, 0)) { 4675 if (R.getAsSingle<NamespaceDecl>() || 4676 R.getAsSingle<NamespaceAliasDecl>()) { 4677 if (DeclContext *DC = computeDeclContext(SS, false)) 4678 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4679 << Ident << DC << Corrected << SS.getRange() 4680 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4681 else 4682 Diag(IdentLoc, diag::err_using_directive_suggest) 4683 << Ident << Corrected 4684 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4685 4686 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4687 << Corrected; 4688 4689 Ident = Corrected.getAsIdentifierInfo(); 4690 } else { 4691 R.clear(); 4692 R.setLookupName(Ident); 4693 } 4694 } 4695 4696 if (R.empty()) { 4697 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4698 return 0; 4699 } 4700 } 4701 4702 NamespaceAliasDecl *AliasDecl = 4703 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4704 Alias, SS.getWithLocInContext(Context), 4705 IdentLoc, R.getFoundDecl()); 4706 4707 PushOnScopeChains(AliasDecl, S); 4708 return AliasDecl; 4709} 4710 4711namespace { 4712 /// \brief Scoped object used to handle the state changes required in Sema 4713 /// to implicitly define the body of a C++ member function; 4714 class ImplicitlyDefinedFunctionScope { 4715 Sema &S; 4716 Sema::ContextRAII SavedContext; 4717 4718 public: 4719 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4720 : S(S), SavedContext(S, Method) 4721 { 4722 S.PushFunctionScope(); 4723 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4724 } 4725 4726 ~ImplicitlyDefinedFunctionScope() { 4727 S.PopExpressionEvaluationContext(); 4728 S.PopFunctionOrBlockScope(); 4729 } 4730 }; 4731} 4732 4733static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4734 CXXRecordDecl *D) { 4735 ASTContext &Context = Self.Context; 4736 QualType ClassType = Context.getTypeDeclType(D); 4737 DeclarationName ConstructorName 4738 = Context.DeclarationNames.getCXXConstructorName( 4739 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4740 4741 DeclContext::lookup_const_iterator Con, ConEnd; 4742 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4743 Con != ConEnd; ++Con) { 4744 // FIXME: In C++0x, a constructor template can be a default constructor. 4745 if (isa<FunctionTemplateDecl>(*Con)) 4746 continue; 4747 4748 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4749 if (Constructor->isDefaultConstructor()) 4750 return Constructor; 4751 } 4752 return 0; 4753} 4754 4755CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4756 CXXRecordDecl *ClassDecl) { 4757 // C++ [class.ctor]p5: 4758 // A default constructor for a class X is a constructor of class X 4759 // that can be called without an argument. If there is no 4760 // user-declared constructor for class X, a default constructor is 4761 // implicitly declared. An implicitly-declared default constructor 4762 // is an inline public member of its class. 4763 assert(!ClassDecl->hasUserDeclaredConstructor() && 4764 "Should not build implicit default constructor!"); 4765 4766 // C++ [except.spec]p14: 4767 // An implicitly declared special member function (Clause 12) shall have an 4768 // exception-specification. [...] 4769 ImplicitExceptionSpecification ExceptSpec(Context); 4770 4771 // Direct base-class constructors. 4772 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4773 BEnd = ClassDecl->bases_end(); 4774 B != BEnd; ++B) { 4775 if (B->isVirtual()) // Handled below. 4776 continue; 4777 4778 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4779 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4780 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4781 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4782 else if (CXXConstructorDecl *Constructor 4783 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4784 ExceptSpec.CalledDecl(Constructor); 4785 } 4786 } 4787 4788 // Virtual base-class constructors. 4789 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4790 BEnd = ClassDecl->vbases_end(); 4791 B != BEnd; ++B) { 4792 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4793 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4794 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4795 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4796 else if (CXXConstructorDecl *Constructor 4797 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4798 ExceptSpec.CalledDecl(Constructor); 4799 } 4800 } 4801 4802 // Field constructors. 4803 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4804 FEnd = ClassDecl->field_end(); 4805 F != FEnd; ++F) { 4806 if (const RecordType *RecordTy 4807 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4808 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4809 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4810 ExceptSpec.CalledDecl( 4811 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4812 else if (CXXConstructorDecl *Constructor 4813 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4814 ExceptSpec.CalledDecl(Constructor); 4815 } 4816 } 4817 4818 FunctionProtoType::ExtProtoInfo EPI; 4819 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4820 EPI.NumExceptions = ExceptSpec.size(); 4821 EPI.Exceptions = ExceptSpec.data(); 4822 4823 // Create the actual constructor declaration. 4824 CanQualType ClassType 4825 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4826 SourceLocation ClassLoc = ClassDecl->getLocation(); 4827 DeclarationName Name 4828 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4829 DeclarationNameInfo NameInfo(Name, ClassLoc); 4830 CXXConstructorDecl *DefaultCon 4831 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4832 Context.getFunctionType(Context.VoidTy, 4833 0, 0, EPI), 4834 /*TInfo=*/0, 4835 /*isExplicit=*/false, 4836 /*isInline=*/true, 4837 /*isImplicitlyDeclared=*/true); 4838 DefaultCon->setAccess(AS_public); 4839 DefaultCon->setImplicit(); 4840 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4841 4842 // Note that we have declared this constructor. 4843 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4844 4845 if (Scope *S = getScopeForContext(ClassDecl)) 4846 PushOnScopeChains(DefaultCon, S, false); 4847 ClassDecl->addDecl(DefaultCon); 4848 4849 return DefaultCon; 4850} 4851 4852void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4853 CXXConstructorDecl *Constructor) { 4854 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4855 !Constructor->isUsed(false)) && 4856 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4857 4858 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4859 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4860 4861 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4862 DiagnosticErrorTrap Trap(Diags); 4863 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4864 Trap.hasErrorOccurred()) { 4865 Diag(CurrentLocation, diag::note_member_synthesized_at) 4866 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4867 Constructor->setInvalidDecl(); 4868 return; 4869 } 4870 4871 SourceLocation Loc = Constructor->getLocation(); 4872 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4873 4874 Constructor->setUsed(); 4875 MarkVTableUsed(CurrentLocation, ClassDecl); 4876} 4877 4878void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4879 // We start with an initial pass over the base classes to collect those that 4880 // inherit constructors from. If there are none, we can forgo all further 4881 // processing. 4882 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4883 BasesVector BasesToInheritFrom; 4884 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4885 BaseE = ClassDecl->bases_end(); 4886 BaseIt != BaseE; ++BaseIt) { 4887 if (BaseIt->getInheritConstructors()) { 4888 QualType Base = BaseIt->getType(); 4889 if (Base->isDependentType()) { 4890 // If we inherit constructors from anything that is dependent, just 4891 // abort processing altogether. We'll get another chance for the 4892 // instantiations. 4893 return; 4894 } 4895 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4896 } 4897 } 4898 if (BasesToInheritFrom.empty()) 4899 return; 4900 4901 // Now collect the constructors that we already have in the current class. 4902 // Those take precedence over inherited constructors. 4903 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4904 // unless there is a user-declared constructor with the same signature in 4905 // the class where the using-declaration appears. 4906 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4907 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4908 CtorE = ClassDecl->ctor_end(); 4909 CtorIt != CtorE; ++CtorIt) { 4910 ExistingConstructors.insert( 4911 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4912 } 4913 4914 Scope *S = getScopeForContext(ClassDecl); 4915 DeclarationName CreatedCtorName = 4916 Context.DeclarationNames.getCXXConstructorName( 4917 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4918 4919 // Now comes the true work. 4920 // First, we keep a map from constructor types to the base that introduced 4921 // them. Needed for finding conflicting constructors. We also keep the 4922 // actually inserted declarations in there, for pretty diagnostics. 4923 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4924 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4925 ConstructorToSourceMap InheritedConstructors; 4926 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4927 BaseE = BasesToInheritFrom.end(); 4928 BaseIt != BaseE; ++BaseIt) { 4929 const RecordType *Base = *BaseIt; 4930 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4931 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4932 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4933 CtorE = BaseDecl->ctor_end(); 4934 CtorIt != CtorE; ++CtorIt) { 4935 // Find the using declaration for inheriting this base's constructors. 4936 DeclarationName Name = 4937 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4938 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4939 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4940 SourceLocation UsingLoc = UD ? UD->getLocation() : 4941 ClassDecl->getLocation(); 4942 4943 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4944 // from the class X named in the using-declaration consists of actual 4945 // constructors and notional constructors that result from the 4946 // transformation of defaulted parameters as follows: 4947 // - all non-template default constructors of X, and 4948 // - for each non-template constructor of X that has at least one 4949 // parameter with a default argument, the set of constructors that 4950 // results from omitting any ellipsis parameter specification and 4951 // successively omitting parameters with a default argument from the 4952 // end of the parameter-type-list. 4953 CXXConstructorDecl *BaseCtor = *CtorIt; 4954 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4955 const FunctionProtoType *BaseCtorType = 4956 BaseCtor->getType()->getAs<FunctionProtoType>(); 4957 4958 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4959 maxParams = BaseCtor->getNumParams(); 4960 params <= maxParams; ++params) { 4961 // Skip default constructors. They're never inherited. 4962 if (params == 0) 4963 continue; 4964 // Skip copy and move constructors for the same reason. 4965 if (CanBeCopyOrMove && params == 1) 4966 continue; 4967 4968 // Build up a function type for this particular constructor. 4969 // FIXME: The working paper does not consider that the exception spec 4970 // for the inheriting constructor might be larger than that of the 4971 // source. This code doesn't yet, either. 4972 const Type *NewCtorType; 4973 if (params == maxParams) 4974 NewCtorType = BaseCtorType; 4975 else { 4976 llvm::SmallVector<QualType, 16> Args; 4977 for (unsigned i = 0; i < params; ++i) { 4978 Args.push_back(BaseCtorType->getArgType(i)); 4979 } 4980 FunctionProtoType::ExtProtoInfo ExtInfo = 4981 BaseCtorType->getExtProtoInfo(); 4982 ExtInfo.Variadic = false; 4983 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4984 Args.data(), params, ExtInfo) 4985 .getTypePtr(); 4986 } 4987 const Type *CanonicalNewCtorType = 4988 Context.getCanonicalType(NewCtorType); 4989 4990 // Now that we have the type, first check if the class already has a 4991 // constructor with this signature. 4992 if (ExistingConstructors.count(CanonicalNewCtorType)) 4993 continue; 4994 4995 // Then we check if we have already declared an inherited constructor 4996 // with this signature. 4997 std::pair<ConstructorToSourceMap::iterator, bool> result = 4998 InheritedConstructors.insert(std::make_pair( 4999 CanonicalNewCtorType, 5000 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5001 if (!result.second) { 5002 // Already in the map. If it came from a different class, that's an 5003 // error. Not if it's from the same. 5004 CanQualType PreviousBase = result.first->second.first; 5005 if (CanonicalBase != PreviousBase) { 5006 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5007 const CXXConstructorDecl *PrevBaseCtor = 5008 PrevCtor->getInheritedConstructor(); 5009 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5010 5011 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5012 Diag(BaseCtor->getLocation(), 5013 diag::note_using_decl_constructor_conflict_current_ctor); 5014 Diag(PrevBaseCtor->getLocation(), 5015 diag::note_using_decl_constructor_conflict_previous_ctor); 5016 Diag(PrevCtor->getLocation(), 5017 diag::note_using_decl_constructor_conflict_previous_using); 5018 } 5019 continue; 5020 } 5021 5022 // OK, we're there, now add the constructor. 5023 // C++0x [class.inhctor]p8: [...] that would be performed by a 5024 // user-writtern inline constructor [...] 5025 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5026 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5027 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5028 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5029 /*ImplicitlyDeclared=*/true); 5030 NewCtor->setAccess(BaseCtor->getAccess()); 5031 5032 // Build up the parameter decls and add them. 5033 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5034 for (unsigned i = 0; i < params; ++i) { 5035 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5036 UsingLoc, UsingLoc, 5037 /*IdentifierInfo=*/0, 5038 BaseCtorType->getArgType(i), 5039 /*TInfo=*/0, SC_None, 5040 SC_None, /*DefaultArg=*/0)); 5041 } 5042 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5043 NewCtor->setInheritedConstructor(BaseCtor); 5044 5045 PushOnScopeChains(NewCtor, S, false); 5046 ClassDecl->addDecl(NewCtor); 5047 result.first->second.second = NewCtor; 5048 } 5049 } 5050 } 5051} 5052 5053CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5054 // C++ [class.dtor]p2: 5055 // If a class has no user-declared destructor, a destructor is 5056 // declared implicitly. An implicitly-declared destructor is an 5057 // inline public member of its class. 5058 5059 // C++ [except.spec]p14: 5060 // An implicitly declared special member function (Clause 12) shall have 5061 // an exception-specification. 5062 ImplicitExceptionSpecification ExceptSpec(Context); 5063 5064 // Direct base-class destructors. 5065 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5066 BEnd = ClassDecl->bases_end(); 5067 B != BEnd; ++B) { 5068 if (B->isVirtual()) // Handled below. 5069 continue; 5070 5071 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5072 ExceptSpec.CalledDecl( 5073 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5074 } 5075 5076 // Virtual base-class destructors. 5077 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5078 BEnd = ClassDecl->vbases_end(); 5079 B != BEnd; ++B) { 5080 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5081 ExceptSpec.CalledDecl( 5082 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5083 } 5084 5085 // Field destructors. 5086 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5087 FEnd = ClassDecl->field_end(); 5088 F != FEnd; ++F) { 5089 if (const RecordType *RecordTy 5090 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5091 ExceptSpec.CalledDecl( 5092 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5093 } 5094 5095 // Create the actual destructor declaration. 5096 FunctionProtoType::ExtProtoInfo EPI; 5097 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5098 EPI.NumExceptions = ExceptSpec.size(); 5099 EPI.Exceptions = ExceptSpec.data(); 5100 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5101 5102 CanQualType ClassType 5103 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5104 SourceLocation ClassLoc = ClassDecl->getLocation(); 5105 DeclarationName Name 5106 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5107 DeclarationNameInfo NameInfo(Name, ClassLoc); 5108 CXXDestructorDecl *Destructor 5109 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5110 /*isInline=*/true, 5111 /*isImplicitlyDeclared=*/true); 5112 Destructor->setAccess(AS_public); 5113 Destructor->setImplicit(); 5114 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5115 5116 // Note that we have declared this destructor. 5117 ++ASTContext::NumImplicitDestructorsDeclared; 5118 5119 // Introduce this destructor into its scope. 5120 if (Scope *S = getScopeForContext(ClassDecl)) 5121 PushOnScopeChains(Destructor, S, false); 5122 ClassDecl->addDecl(Destructor); 5123 5124 // This could be uniqued if it ever proves significant. 5125 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5126 5127 AddOverriddenMethods(ClassDecl, Destructor); 5128 5129 return Destructor; 5130} 5131 5132void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5133 CXXDestructorDecl *Destructor) { 5134 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5135 "DefineImplicitDestructor - call it for implicit default dtor"); 5136 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5137 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5138 5139 if (Destructor->isInvalidDecl()) 5140 return; 5141 5142 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5143 5144 DiagnosticErrorTrap Trap(Diags); 5145 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5146 Destructor->getParent()); 5147 5148 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5149 Diag(CurrentLocation, diag::note_member_synthesized_at) 5150 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5151 5152 Destructor->setInvalidDecl(); 5153 return; 5154 } 5155 5156 SourceLocation Loc = Destructor->getLocation(); 5157 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5158 5159 Destructor->setUsed(); 5160 MarkVTableUsed(CurrentLocation, ClassDecl); 5161} 5162 5163/// \brief Builds a statement that copies the given entity from \p From to 5164/// \c To. 5165/// 5166/// This routine is used to copy the members of a class with an 5167/// implicitly-declared copy assignment operator. When the entities being 5168/// copied are arrays, this routine builds for loops to copy them. 5169/// 5170/// \param S The Sema object used for type-checking. 5171/// 5172/// \param Loc The location where the implicit copy is being generated. 5173/// 5174/// \param T The type of the expressions being copied. Both expressions must 5175/// have this type. 5176/// 5177/// \param To The expression we are copying to. 5178/// 5179/// \param From The expression we are copying from. 5180/// 5181/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5182/// Otherwise, it's a non-static member subobject. 5183/// 5184/// \param Depth Internal parameter recording the depth of the recursion. 5185/// 5186/// \returns A statement or a loop that copies the expressions. 5187static StmtResult 5188BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5189 Expr *To, Expr *From, 5190 bool CopyingBaseSubobject, unsigned Depth = 0) { 5191 // C++0x [class.copy]p30: 5192 // Each subobject is assigned in the manner appropriate to its type: 5193 // 5194 // - if the subobject is of class type, the copy assignment operator 5195 // for the class is used (as if by explicit qualification; that is, 5196 // ignoring any possible virtual overriding functions in more derived 5197 // classes); 5198 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5199 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5200 5201 // Look for operator=. 5202 DeclarationName Name 5203 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5204 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5205 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5206 5207 // Filter out any result that isn't a copy-assignment operator. 5208 LookupResult::Filter F = OpLookup.makeFilter(); 5209 while (F.hasNext()) { 5210 NamedDecl *D = F.next(); 5211 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5212 if (Method->isCopyAssignmentOperator()) 5213 continue; 5214 5215 F.erase(); 5216 } 5217 F.done(); 5218 5219 // Suppress the protected check (C++ [class.protected]) for each of the 5220 // assignment operators we found. This strange dance is required when 5221 // we're assigning via a base classes's copy-assignment operator. To 5222 // ensure that we're getting the right base class subobject (without 5223 // ambiguities), we need to cast "this" to that subobject type; to 5224 // ensure that we don't go through the virtual call mechanism, we need 5225 // to qualify the operator= name with the base class (see below). However, 5226 // this means that if the base class has a protected copy assignment 5227 // operator, the protected member access check will fail. So, we 5228 // rewrite "protected" access to "public" access in this case, since we 5229 // know by construction that we're calling from a derived class. 5230 if (CopyingBaseSubobject) { 5231 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5232 L != LEnd; ++L) { 5233 if (L.getAccess() == AS_protected) 5234 L.setAccess(AS_public); 5235 } 5236 } 5237 5238 // Create the nested-name-specifier that will be used to qualify the 5239 // reference to operator=; this is required to suppress the virtual 5240 // call mechanism. 5241 CXXScopeSpec SS; 5242 SS.MakeTrivial(S.Context, 5243 NestedNameSpecifier::Create(S.Context, 0, false, 5244 T.getTypePtr()), 5245 Loc); 5246 5247 // Create the reference to operator=. 5248 ExprResult OpEqualRef 5249 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5250 /*FirstQualifierInScope=*/0, OpLookup, 5251 /*TemplateArgs=*/0, 5252 /*SuppressQualifierCheck=*/true); 5253 if (OpEqualRef.isInvalid()) 5254 return StmtError(); 5255 5256 // Build the call to the assignment operator. 5257 5258 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5259 OpEqualRef.takeAs<Expr>(), 5260 Loc, &From, 1, Loc); 5261 if (Call.isInvalid()) 5262 return StmtError(); 5263 5264 return S.Owned(Call.takeAs<Stmt>()); 5265 } 5266 5267 // - if the subobject is of scalar type, the built-in assignment 5268 // operator is used. 5269 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5270 if (!ArrayTy) { 5271 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5272 if (Assignment.isInvalid()) 5273 return StmtError(); 5274 5275 return S.Owned(Assignment.takeAs<Stmt>()); 5276 } 5277 5278 // - if the subobject is an array, each element is assigned, in the 5279 // manner appropriate to the element type; 5280 5281 // Construct a loop over the array bounds, e.g., 5282 // 5283 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5284 // 5285 // that will copy each of the array elements. 5286 QualType SizeType = S.Context.getSizeType(); 5287 5288 // Create the iteration variable. 5289 IdentifierInfo *IterationVarName = 0; 5290 { 5291 llvm::SmallString<8> Str; 5292 llvm::raw_svector_ostream OS(Str); 5293 OS << "__i" << Depth; 5294 IterationVarName = &S.Context.Idents.get(OS.str()); 5295 } 5296 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5297 IterationVarName, SizeType, 5298 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5299 SC_None, SC_None); 5300 5301 // Initialize the iteration variable to zero. 5302 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5303 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5304 5305 // Create a reference to the iteration variable; we'll use this several 5306 // times throughout. 5307 Expr *IterationVarRef 5308 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5309 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5310 5311 // Create the DeclStmt that holds the iteration variable. 5312 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5313 5314 // Create the comparison against the array bound. 5315 llvm::APInt Upper 5316 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5317 Expr *Comparison 5318 = new (S.Context) BinaryOperator(IterationVarRef, 5319 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5320 BO_NE, S.Context.BoolTy, 5321 VK_RValue, OK_Ordinary, Loc); 5322 5323 // Create the pre-increment of the iteration variable. 5324 Expr *Increment 5325 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5326 VK_LValue, OK_Ordinary, Loc); 5327 5328 // Subscript the "from" and "to" expressions with the iteration variable. 5329 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5330 IterationVarRef, Loc)); 5331 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5332 IterationVarRef, Loc)); 5333 5334 // Build the copy for an individual element of the array. 5335 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5336 To, From, CopyingBaseSubobject, 5337 Depth + 1); 5338 if (Copy.isInvalid()) 5339 return StmtError(); 5340 5341 // Construct the loop that copies all elements of this array. 5342 return S.ActOnForStmt(Loc, Loc, InitStmt, 5343 S.MakeFullExpr(Comparison), 5344 0, S.MakeFullExpr(Increment), 5345 Loc, Copy.take()); 5346} 5347 5348/// \brief Determine whether the given class has a copy assignment operator 5349/// that accepts a const-qualified argument. 5350static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5351 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5352 5353 if (!Class->hasDeclaredCopyAssignment()) 5354 S.DeclareImplicitCopyAssignment(Class); 5355 5356 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5357 DeclarationName OpName 5358 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5359 5360 DeclContext::lookup_const_iterator Op, OpEnd; 5361 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5362 // C++ [class.copy]p9: 5363 // A user-declared copy assignment operator is a non-static non-template 5364 // member function of class X with exactly one parameter of type X, X&, 5365 // const X&, volatile X& or const volatile X&. 5366 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5367 if (!Method) 5368 continue; 5369 5370 if (Method->isStatic()) 5371 continue; 5372 if (Method->getPrimaryTemplate()) 5373 continue; 5374 const FunctionProtoType *FnType = 5375 Method->getType()->getAs<FunctionProtoType>(); 5376 assert(FnType && "Overloaded operator has no prototype."); 5377 // Don't assert on this; an invalid decl might have been left in the AST. 5378 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5379 continue; 5380 bool AcceptsConst = true; 5381 QualType ArgType = FnType->getArgType(0); 5382 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5383 ArgType = Ref->getPointeeType(); 5384 // Is it a non-const lvalue reference? 5385 if (!ArgType.isConstQualified()) 5386 AcceptsConst = false; 5387 } 5388 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5389 continue; 5390 5391 // We have a single argument of type cv X or cv X&, i.e. we've found the 5392 // copy assignment operator. Return whether it accepts const arguments. 5393 return AcceptsConst; 5394 } 5395 assert(Class->isInvalidDecl() && 5396 "No copy assignment operator declared in valid code."); 5397 return false; 5398} 5399 5400CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5401 // Note: The following rules are largely analoguous to the copy 5402 // constructor rules. Note that virtual bases are not taken into account 5403 // for determining the argument type of the operator. Note also that 5404 // operators taking an object instead of a reference are allowed. 5405 5406 5407 // C++ [class.copy]p10: 5408 // If the class definition does not explicitly declare a copy 5409 // assignment operator, one is declared implicitly. 5410 // The implicitly-defined copy assignment operator for a class X 5411 // will have the form 5412 // 5413 // X& X::operator=(const X&) 5414 // 5415 // if 5416 bool HasConstCopyAssignment = true; 5417 5418 // -- each direct base class B of X has a copy assignment operator 5419 // whose parameter is of type const B&, const volatile B& or B, 5420 // and 5421 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5422 BaseEnd = ClassDecl->bases_end(); 5423 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5424 assert(!Base->getType()->isDependentType() && 5425 "Cannot generate implicit members for class with dependent bases."); 5426 const CXXRecordDecl *BaseClassDecl 5427 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5428 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5429 } 5430 5431 // -- for all the nonstatic data members of X that are of a class 5432 // type M (or array thereof), each such class type has a copy 5433 // assignment operator whose parameter is of type const M&, 5434 // const volatile M& or M. 5435 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5436 FieldEnd = ClassDecl->field_end(); 5437 HasConstCopyAssignment && Field != FieldEnd; 5438 ++Field) { 5439 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5440 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5441 const CXXRecordDecl *FieldClassDecl 5442 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5443 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5444 } 5445 } 5446 5447 // Otherwise, the implicitly declared copy assignment operator will 5448 // have the form 5449 // 5450 // X& X::operator=(X&) 5451 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5452 QualType RetType = Context.getLValueReferenceType(ArgType); 5453 if (HasConstCopyAssignment) 5454 ArgType = ArgType.withConst(); 5455 ArgType = Context.getLValueReferenceType(ArgType); 5456 5457 // C++ [except.spec]p14: 5458 // An implicitly declared special member function (Clause 12) shall have an 5459 // exception-specification. [...] 5460 ImplicitExceptionSpecification ExceptSpec(Context); 5461 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5462 BaseEnd = ClassDecl->bases_end(); 5463 Base != BaseEnd; ++Base) { 5464 CXXRecordDecl *BaseClassDecl 5465 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5466 5467 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5468 DeclareImplicitCopyAssignment(BaseClassDecl); 5469 5470 if (CXXMethodDecl *CopyAssign 5471 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5472 ExceptSpec.CalledDecl(CopyAssign); 5473 } 5474 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5475 FieldEnd = ClassDecl->field_end(); 5476 Field != FieldEnd; 5477 ++Field) { 5478 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5479 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5480 CXXRecordDecl *FieldClassDecl 5481 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5482 5483 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5484 DeclareImplicitCopyAssignment(FieldClassDecl); 5485 5486 if (CXXMethodDecl *CopyAssign 5487 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5488 ExceptSpec.CalledDecl(CopyAssign); 5489 } 5490 } 5491 5492 // An implicitly-declared copy assignment operator is an inline public 5493 // member of its class. 5494 FunctionProtoType::ExtProtoInfo EPI; 5495 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5496 EPI.NumExceptions = ExceptSpec.size(); 5497 EPI.Exceptions = ExceptSpec.data(); 5498 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5499 SourceLocation ClassLoc = ClassDecl->getLocation(); 5500 DeclarationNameInfo NameInfo(Name, ClassLoc); 5501 CXXMethodDecl *CopyAssignment 5502 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5503 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5504 /*TInfo=*/0, /*isStatic=*/false, 5505 /*StorageClassAsWritten=*/SC_None, 5506 /*isInline=*/true, 5507 SourceLocation()); 5508 CopyAssignment->setAccess(AS_public); 5509 CopyAssignment->setImplicit(); 5510 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5511 5512 // Add the parameter to the operator. 5513 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5514 ClassLoc, ClassLoc, /*Id=*/0, 5515 ArgType, /*TInfo=*/0, 5516 SC_None, 5517 SC_None, 0); 5518 CopyAssignment->setParams(&FromParam, 1); 5519 5520 // Note that we have added this copy-assignment operator. 5521 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5522 5523 if (Scope *S = getScopeForContext(ClassDecl)) 5524 PushOnScopeChains(CopyAssignment, S, false); 5525 ClassDecl->addDecl(CopyAssignment); 5526 5527 AddOverriddenMethods(ClassDecl, CopyAssignment); 5528 return CopyAssignment; 5529} 5530 5531void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5532 CXXMethodDecl *CopyAssignOperator) { 5533 assert((CopyAssignOperator->isImplicit() && 5534 CopyAssignOperator->isOverloadedOperator() && 5535 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5536 !CopyAssignOperator->isUsed(false)) && 5537 "DefineImplicitCopyAssignment called for wrong function"); 5538 5539 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5540 5541 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5542 CopyAssignOperator->setInvalidDecl(); 5543 return; 5544 } 5545 5546 CopyAssignOperator->setUsed(); 5547 5548 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5549 DiagnosticErrorTrap Trap(Diags); 5550 5551 // C++0x [class.copy]p30: 5552 // The implicitly-defined or explicitly-defaulted copy assignment operator 5553 // for a non-union class X performs memberwise copy assignment of its 5554 // subobjects. The direct base classes of X are assigned first, in the 5555 // order of their declaration in the base-specifier-list, and then the 5556 // immediate non-static data members of X are assigned, in the order in 5557 // which they were declared in the class definition. 5558 5559 // The statements that form the synthesized function body. 5560 ASTOwningVector<Stmt*> Statements(*this); 5561 5562 // The parameter for the "other" object, which we are copying from. 5563 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5564 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5565 QualType OtherRefType = Other->getType(); 5566 if (const LValueReferenceType *OtherRef 5567 = OtherRefType->getAs<LValueReferenceType>()) { 5568 OtherRefType = OtherRef->getPointeeType(); 5569 OtherQuals = OtherRefType.getQualifiers(); 5570 } 5571 5572 // Our location for everything implicitly-generated. 5573 SourceLocation Loc = CopyAssignOperator->getLocation(); 5574 5575 // Construct a reference to the "other" object. We'll be using this 5576 // throughout the generated ASTs. 5577 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5578 assert(OtherRef && "Reference to parameter cannot fail!"); 5579 5580 // Construct the "this" pointer. We'll be using this throughout the generated 5581 // ASTs. 5582 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5583 assert(This && "Reference to this cannot fail!"); 5584 5585 // Assign base classes. 5586 bool Invalid = false; 5587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5588 E = ClassDecl->bases_end(); Base != E; ++Base) { 5589 // Form the assignment: 5590 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5591 QualType BaseType = Base->getType().getUnqualifiedType(); 5592 if (!BaseType->isRecordType()) { 5593 Invalid = true; 5594 continue; 5595 } 5596 5597 CXXCastPath BasePath; 5598 BasePath.push_back(Base); 5599 5600 // Construct the "from" expression, which is an implicit cast to the 5601 // appropriately-qualified base type. 5602 Expr *From = OtherRef; 5603 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5604 CK_UncheckedDerivedToBase, 5605 VK_LValue, &BasePath); 5606 5607 // Dereference "this". 5608 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5609 5610 // Implicitly cast "this" to the appropriately-qualified base type. 5611 Expr *ToE = To.takeAs<Expr>(); 5612 ImpCastExprToType(ToE, 5613 Context.getCVRQualifiedType(BaseType, 5614 CopyAssignOperator->getTypeQualifiers()), 5615 CK_UncheckedDerivedToBase, 5616 VK_LValue, &BasePath); 5617 To = Owned(ToE); 5618 5619 // Build the copy. 5620 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5621 To.get(), From, 5622 /*CopyingBaseSubobject=*/true); 5623 if (Copy.isInvalid()) { 5624 Diag(CurrentLocation, diag::note_member_synthesized_at) 5625 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5626 CopyAssignOperator->setInvalidDecl(); 5627 return; 5628 } 5629 5630 // Success! Record the copy. 5631 Statements.push_back(Copy.takeAs<Expr>()); 5632 } 5633 5634 // \brief Reference to the __builtin_memcpy function. 5635 Expr *BuiltinMemCpyRef = 0; 5636 // \brief Reference to the __builtin_objc_memmove_collectable function. 5637 Expr *CollectableMemCpyRef = 0; 5638 5639 // Assign non-static members. 5640 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5641 FieldEnd = ClassDecl->field_end(); 5642 Field != FieldEnd; ++Field) { 5643 // Check for members of reference type; we can't copy those. 5644 if (Field->getType()->isReferenceType()) { 5645 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5646 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5647 Diag(Field->getLocation(), diag::note_declared_at); 5648 Diag(CurrentLocation, diag::note_member_synthesized_at) 5649 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5650 Invalid = true; 5651 continue; 5652 } 5653 5654 // Check for members of const-qualified, non-class type. 5655 QualType BaseType = Context.getBaseElementType(Field->getType()); 5656 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5657 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5658 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5659 Diag(Field->getLocation(), diag::note_declared_at); 5660 Diag(CurrentLocation, diag::note_member_synthesized_at) 5661 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5662 Invalid = true; 5663 continue; 5664 } 5665 5666 QualType FieldType = Field->getType().getNonReferenceType(); 5667 if (FieldType->isIncompleteArrayType()) { 5668 assert(ClassDecl->hasFlexibleArrayMember() && 5669 "Incomplete array type is not valid"); 5670 continue; 5671 } 5672 5673 // Build references to the field in the object we're copying from and to. 5674 CXXScopeSpec SS; // Intentionally empty 5675 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5676 LookupMemberName); 5677 MemberLookup.addDecl(*Field); 5678 MemberLookup.resolveKind(); 5679 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5680 Loc, /*IsArrow=*/false, 5681 SS, 0, MemberLookup, 0); 5682 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5683 Loc, /*IsArrow=*/true, 5684 SS, 0, MemberLookup, 0); 5685 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5686 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5687 5688 // If the field should be copied with __builtin_memcpy rather than via 5689 // explicit assignments, do so. This optimization only applies for arrays 5690 // of scalars and arrays of class type with trivial copy-assignment 5691 // operators. 5692 if (FieldType->isArrayType() && 5693 (!BaseType->isRecordType() || 5694 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5695 ->hasTrivialCopyAssignment())) { 5696 // Compute the size of the memory buffer to be copied. 5697 QualType SizeType = Context.getSizeType(); 5698 llvm::APInt Size(Context.getTypeSize(SizeType), 5699 Context.getTypeSizeInChars(BaseType).getQuantity()); 5700 for (const ConstantArrayType *Array 5701 = Context.getAsConstantArrayType(FieldType); 5702 Array; 5703 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5704 llvm::APInt ArraySize 5705 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5706 Size *= ArraySize; 5707 } 5708 5709 // Take the address of the field references for "from" and "to". 5710 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5711 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5712 5713 bool NeedsCollectableMemCpy = 5714 (BaseType->isRecordType() && 5715 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5716 5717 if (NeedsCollectableMemCpy) { 5718 if (!CollectableMemCpyRef) { 5719 // Create a reference to the __builtin_objc_memmove_collectable function. 5720 LookupResult R(*this, 5721 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5722 Loc, LookupOrdinaryName); 5723 LookupName(R, TUScope, true); 5724 5725 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5726 if (!CollectableMemCpy) { 5727 // Something went horribly wrong earlier, and we will have 5728 // complained about it. 5729 Invalid = true; 5730 continue; 5731 } 5732 5733 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5734 CollectableMemCpy->getType(), 5735 VK_LValue, Loc, 0).take(); 5736 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5737 } 5738 } 5739 // Create a reference to the __builtin_memcpy builtin function. 5740 else if (!BuiltinMemCpyRef) { 5741 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5742 LookupOrdinaryName); 5743 LookupName(R, TUScope, true); 5744 5745 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5746 if (!BuiltinMemCpy) { 5747 // Something went horribly wrong earlier, and we will have complained 5748 // about it. 5749 Invalid = true; 5750 continue; 5751 } 5752 5753 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5754 BuiltinMemCpy->getType(), 5755 VK_LValue, Loc, 0).take(); 5756 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5757 } 5758 5759 ASTOwningVector<Expr*> CallArgs(*this); 5760 CallArgs.push_back(To.takeAs<Expr>()); 5761 CallArgs.push_back(From.takeAs<Expr>()); 5762 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5763 ExprResult Call = ExprError(); 5764 if (NeedsCollectableMemCpy) 5765 Call = ActOnCallExpr(/*Scope=*/0, 5766 CollectableMemCpyRef, 5767 Loc, move_arg(CallArgs), 5768 Loc); 5769 else 5770 Call = ActOnCallExpr(/*Scope=*/0, 5771 BuiltinMemCpyRef, 5772 Loc, move_arg(CallArgs), 5773 Loc); 5774 5775 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5776 Statements.push_back(Call.takeAs<Expr>()); 5777 continue; 5778 } 5779 5780 // Build the copy of this field. 5781 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5782 To.get(), From.get(), 5783 /*CopyingBaseSubobject=*/false); 5784 if (Copy.isInvalid()) { 5785 Diag(CurrentLocation, diag::note_member_synthesized_at) 5786 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5787 CopyAssignOperator->setInvalidDecl(); 5788 return; 5789 } 5790 5791 // Success! Record the copy. 5792 Statements.push_back(Copy.takeAs<Stmt>()); 5793 } 5794 5795 if (!Invalid) { 5796 // Add a "return *this;" 5797 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5798 5799 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5800 if (Return.isInvalid()) 5801 Invalid = true; 5802 else { 5803 Statements.push_back(Return.takeAs<Stmt>()); 5804 5805 if (Trap.hasErrorOccurred()) { 5806 Diag(CurrentLocation, diag::note_member_synthesized_at) 5807 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5808 Invalid = true; 5809 } 5810 } 5811 } 5812 5813 if (Invalid) { 5814 CopyAssignOperator->setInvalidDecl(); 5815 return; 5816 } 5817 5818 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5819 /*isStmtExpr=*/false); 5820 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5821 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5822} 5823 5824CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5825 CXXRecordDecl *ClassDecl) { 5826 // C++ [class.copy]p4: 5827 // If the class definition does not explicitly declare a copy 5828 // constructor, one is declared implicitly. 5829 5830 // C++ [class.copy]p5: 5831 // The implicitly-declared copy constructor for a class X will 5832 // have the form 5833 // 5834 // X::X(const X&) 5835 // 5836 // if 5837 bool HasConstCopyConstructor = true; 5838 5839 // -- each direct or virtual base class B of X has a copy 5840 // constructor whose first parameter is of type const B& or 5841 // const volatile B&, and 5842 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5843 BaseEnd = ClassDecl->bases_end(); 5844 HasConstCopyConstructor && Base != BaseEnd; 5845 ++Base) { 5846 // Virtual bases are handled below. 5847 if (Base->isVirtual()) 5848 continue; 5849 5850 CXXRecordDecl *BaseClassDecl 5851 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5852 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5853 DeclareImplicitCopyConstructor(BaseClassDecl); 5854 5855 HasConstCopyConstructor 5856 = BaseClassDecl->hasConstCopyConstructor(Context); 5857 } 5858 5859 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5860 BaseEnd = ClassDecl->vbases_end(); 5861 HasConstCopyConstructor && Base != BaseEnd; 5862 ++Base) { 5863 CXXRecordDecl *BaseClassDecl 5864 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5865 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5866 DeclareImplicitCopyConstructor(BaseClassDecl); 5867 5868 HasConstCopyConstructor 5869 = BaseClassDecl->hasConstCopyConstructor(Context); 5870 } 5871 5872 // -- for all the nonstatic data members of X that are of a 5873 // class type M (or array thereof), each such class type 5874 // has a copy constructor whose first parameter is of type 5875 // const M& or const volatile M&. 5876 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5877 FieldEnd = ClassDecl->field_end(); 5878 HasConstCopyConstructor && Field != FieldEnd; 5879 ++Field) { 5880 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5881 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5882 CXXRecordDecl *FieldClassDecl 5883 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5884 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5885 DeclareImplicitCopyConstructor(FieldClassDecl); 5886 5887 HasConstCopyConstructor 5888 = FieldClassDecl->hasConstCopyConstructor(Context); 5889 } 5890 } 5891 5892 // Otherwise, the implicitly declared copy constructor will have 5893 // the form 5894 // 5895 // X::X(X&) 5896 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5897 QualType ArgType = ClassType; 5898 if (HasConstCopyConstructor) 5899 ArgType = ArgType.withConst(); 5900 ArgType = Context.getLValueReferenceType(ArgType); 5901 5902 // C++ [except.spec]p14: 5903 // An implicitly declared special member function (Clause 12) shall have an 5904 // exception-specification. [...] 5905 ImplicitExceptionSpecification ExceptSpec(Context); 5906 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5907 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5908 BaseEnd = ClassDecl->bases_end(); 5909 Base != BaseEnd; 5910 ++Base) { 5911 // Virtual bases are handled below. 5912 if (Base->isVirtual()) 5913 continue; 5914 5915 CXXRecordDecl *BaseClassDecl 5916 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5917 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5918 DeclareImplicitCopyConstructor(BaseClassDecl); 5919 5920 if (CXXConstructorDecl *CopyConstructor 5921 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5922 ExceptSpec.CalledDecl(CopyConstructor); 5923 } 5924 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5925 BaseEnd = ClassDecl->vbases_end(); 5926 Base != BaseEnd; 5927 ++Base) { 5928 CXXRecordDecl *BaseClassDecl 5929 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5930 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5931 DeclareImplicitCopyConstructor(BaseClassDecl); 5932 5933 if (CXXConstructorDecl *CopyConstructor 5934 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5935 ExceptSpec.CalledDecl(CopyConstructor); 5936 } 5937 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5938 FieldEnd = ClassDecl->field_end(); 5939 Field != FieldEnd; 5940 ++Field) { 5941 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5942 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5943 CXXRecordDecl *FieldClassDecl 5944 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5945 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5946 DeclareImplicitCopyConstructor(FieldClassDecl); 5947 5948 if (CXXConstructorDecl *CopyConstructor 5949 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5950 ExceptSpec.CalledDecl(CopyConstructor); 5951 } 5952 } 5953 5954 // An implicitly-declared copy constructor is an inline public 5955 // member of its class. 5956 FunctionProtoType::ExtProtoInfo EPI; 5957 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5958 EPI.NumExceptions = ExceptSpec.size(); 5959 EPI.Exceptions = ExceptSpec.data(); 5960 DeclarationName Name 5961 = Context.DeclarationNames.getCXXConstructorName( 5962 Context.getCanonicalType(ClassType)); 5963 SourceLocation ClassLoc = ClassDecl->getLocation(); 5964 DeclarationNameInfo NameInfo(Name, ClassLoc); 5965 CXXConstructorDecl *CopyConstructor 5966 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5967 Context.getFunctionType(Context.VoidTy, 5968 &ArgType, 1, EPI), 5969 /*TInfo=*/0, 5970 /*isExplicit=*/false, 5971 /*isInline=*/true, 5972 /*isImplicitlyDeclared=*/true); 5973 CopyConstructor->setAccess(AS_public); 5974 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5975 5976 // Note that we have declared this constructor. 5977 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5978 5979 // Add the parameter to the constructor. 5980 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5981 ClassLoc, ClassLoc, 5982 /*IdentifierInfo=*/0, 5983 ArgType, /*TInfo=*/0, 5984 SC_None, 5985 SC_None, 0); 5986 CopyConstructor->setParams(&FromParam, 1); 5987 if (Scope *S = getScopeForContext(ClassDecl)) 5988 PushOnScopeChains(CopyConstructor, S, false); 5989 ClassDecl->addDecl(CopyConstructor); 5990 5991 return CopyConstructor; 5992} 5993 5994void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5995 CXXConstructorDecl *CopyConstructor, 5996 unsigned TypeQuals) { 5997 assert((CopyConstructor->isImplicit() && 5998 CopyConstructor->isCopyConstructor(TypeQuals) && 5999 !CopyConstructor->isUsed(false)) && 6000 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6001 6002 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6003 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6004 6005 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6006 DiagnosticErrorTrap Trap(Diags); 6007 6008 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6009 Trap.hasErrorOccurred()) { 6010 Diag(CurrentLocation, diag::note_member_synthesized_at) 6011 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6012 CopyConstructor->setInvalidDecl(); 6013 } else { 6014 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6015 CopyConstructor->getLocation(), 6016 MultiStmtArg(*this, 0, 0), 6017 /*isStmtExpr=*/false) 6018 .takeAs<Stmt>()); 6019 } 6020 6021 CopyConstructor->setUsed(); 6022} 6023 6024ExprResult 6025Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6026 CXXConstructorDecl *Constructor, 6027 MultiExprArg ExprArgs, 6028 bool RequiresZeroInit, 6029 unsigned ConstructKind, 6030 SourceRange ParenRange) { 6031 bool Elidable = false; 6032 6033 // C++0x [class.copy]p34: 6034 // When certain criteria are met, an implementation is allowed to 6035 // omit the copy/move construction of a class object, even if the 6036 // copy/move constructor and/or destructor for the object have 6037 // side effects. [...] 6038 // - when a temporary class object that has not been bound to a 6039 // reference (12.2) would be copied/moved to a class object 6040 // with the same cv-unqualified type, the copy/move operation 6041 // can be omitted by constructing the temporary object 6042 // directly into the target of the omitted copy/move 6043 if (ConstructKind == CXXConstructExpr::CK_Complete && 6044 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6045 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6046 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6047 } 6048 6049 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6050 Elidable, move(ExprArgs), RequiresZeroInit, 6051 ConstructKind, ParenRange); 6052} 6053 6054/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6055/// including handling of its default argument expressions. 6056ExprResult 6057Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6058 CXXConstructorDecl *Constructor, bool Elidable, 6059 MultiExprArg ExprArgs, 6060 bool RequiresZeroInit, 6061 unsigned ConstructKind, 6062 SourceRange ParenRange) { 6063 unsigned NumExprs = ExprArgs.size(); 6064 Expr **Exprs = (Expr **)ExprArgs.release(); 6065 6066 MarkDeclarationReferenced(ConstructLoc, Constructor); 6067 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6068 Constructor, Elidable, Exprs, NumExprs, 6069 RequiresZeroInit, 6070 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6071 ParenRange)); 6072} 6073 6074bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6075 CXXConstructorDecl *Constructor, 6076 MultiExprArg Exprs) { 6077 // FIXME: Provide the correct paren SourceRange when available. 6078 ExprResult TempResult = 6079 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6080 move(Exprs), false, CXXConstructExpr::CK_Complete, 6081 SourceRange()); 6082 if (TempResult.isInvalid()) 6083 return true; 6084 6085 Expr *Temp = TempResult.takeAs<Expr>(); 6086 CheckImplicitConversions(Temp, VD->getLocation()); 6087 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6088 Temp = MaybeCreateExprWithCleanups(Temp); 6089 VD->setInit(Temp); 6090 6091 return false; 6092} 6093 6094void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6095 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6096 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 6097 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 6098 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6099 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6100 CheckDestructorAccess(VD->getLocation(), Destructor, 6101 PDiag(diag::err_access_dtor_var) 6102 << VD->getDeclName() 6103 << VD->getType()); 6104 6105 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) { 6106 // TODO: this should be re-enabled for static locals by !CXAAtExit 6107 if (!VD->isStaticLocal()) 6108 Diag(VD->getLocation(), diag::warn_global_destructor); 6109 6110 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6111 } 6112 } 6113} 6114 6115/// AddCXXDirectInitializerToDecl - This action is called immediately after 6116/// ActOnDeclarator, when a C++ direct initializer is present. 6117/// e.g: "int x(1);" 6118void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6119 SourceLocation LParenLoc, 6120 MultiExprArg Exprs, 6121 SourceLocation RParenLoc, 6122 bool TypeMayContainAuto) { 6123 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6124 6125 // If there is no declaration, there was an error parsing it. Just ignore 6126 // the initializer. 6127 if (RealDecl == 0) 6128 return; 6129 6130 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6131 if (!VDecl) { 6132 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6133 RealDecl->setInvalidDecl(); 6134 return; 6135 } 6136 6137 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6138 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6139 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6140 if (Exprs.size() > 1) { 6141 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6142 diag::err_auto_var_init_multiple_expressions) 6143 << VDecl->getDeclName() << VDecl->getType() 6144 << VDecl->getSourceRange(); 6145 RealDecl->setInvalidDecl(); 6146 return; 6147 } 6148 6149 Expr *Init = Exprs.get()[0]; 6150 TypeSourceInfo *DeducedType = 0; 6151 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6152 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6153 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6154 << Init->getSourceRange(); 6155 if (!DeducedType) { 6156 RealDecl->setInvalidDecl(); 6157 return; 6158 } 6159 VDecl->setTypeSourceInfo(DeducedType); 6160 VDecl->setType(DeducedType->getType()); 6161 6162 // If this is a redeclaration, check that the type we just deduced matches 6163 // the previously declared type. 6164 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6165 MergeVarDeclTypes(VDecl, Old); 6166 } 6167 6168 // We will represent direct-initialization similarly to copy-initialization: 6169 // int x(1); -as-> int x = 1; 6170 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6171 // 6172 // Clients that want to distinguish between the two forms, can check for 6173 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6174 // A major benefit is that clients that don't particularly care about which 6175 // exactly form was it (like the CodeGen) can handle both cases without 6176 // special case code. 6177 6178 // C++ 8.5p11: 6179 // The form of initialization (using parentheses or '=') is generally 6180 // insignificant, but does matter when the entity being initialized has a 6181 // class type. 6182 6183 if (!VDecl->getType()->isDependentType() && 6184 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6185 diag::err_typecheck_decl_incomplete_type)) { 6186 VDecl->setInvalidDecl(); 6187 return; 6188 } 6189 6190 // The variable can not have an abstract class type. 6191 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6192 diag::err_abstract_type_in_decl, 6193 AbstractVariableType)) 6194 VDecl->setInvalidDecl(); 6195 6196 const VarDecl *Def; 6197 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6198 Diag(VDecl->getLocation(), diag::err_redefinition) 6199 << VDecl->getDeclName(); 6200 Diag(Def->getLocation(), diag::note_previous_definition); 6201 VDecl->setInvalidDecl(); 6202 return; 6203 } 6204 6205 // C++ [class.static.data]p4 6206 // If a static data member is of const integral or const 6207 // enumeration type, its declaration in the class definition can 6208 // specify a constant-initializer which shall be an integral 6209 // constant expression (5.19). In that case, the member can appear 6210 // in integral constant expressions. The member shall still be 6211 // defined in a namespace scope if it is used in the program and the 6212 // namespace scope definition shall not contain an initializer. 6213 // 6214 // We already performed a redefinition check above, but for static 6215 // data members we also need to check whether there was an in-class 6216 // declaration with an initializer. 6217 const VarDecl* PrevInit = 0; 6218 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6219 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6220 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6221 return; 6222 } 6223 6224 bool IsDependent = false; 6225 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6226 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6227 VDecl->setInvalidDecl(); 6228 return; 6229 } 6230 6231 if (Exprs.get()[I]->isTypeDependent()) 6232 IsDependent = true; 6233 } 6234 6235 // If either the declaration has a dependent type or if any of the 6236 // expressions is type-dependent, we represent the initialization 6237 // via a ParenListExpr for later use during template instantiation. 6238 if (VDecl->getType()->isDependentType() || IsDependent) { 6239 // Let clients know that initialization was done with a direct initializer. 6240 VDecl->setCXXDirectInitializer(true); 6241 6242 // Store the initialization expressions as a ParenListExpr. 6243 unsigned NumExprs = Exprs.size(); 6244 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6245 (Expr **)Exprs.release(), 6246 NumExprs, RParenLoc)); 6247 return; 6248 } 6249 6250 // Capture the variable that is being initialized and the style of 6251 // initialization. 6252 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6253 6254 // FIXME: Poor source location information. 6255 InitializationKind Kind 6256 = InitializationKind::CreateDirect(VDecl->getLocation(), 6257 LParenLoc, RParenLoc); 6258 6259 InitializationSequence InitSeq(*this, Entity, Kind, 6260 Exprs.get(), Exprs.size()); 6261 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6262 if (Result.isInvalid()) { 6263 VDecl->setInvalidDecl(); 6264 return; 6265 } 6266 6267 CheckImplicitConversions(Result.get(), LParenLoc); 6268 6269 Result = MaybeCreateExprWithCleanups(Result); 6270 VDecl->setInit(Result.takeAs<Expr>()); 6271 VDecl->setCXXDirectInitializer(true); 6272 6273 CheckCompleteVariableDeclaration(VDecl); 6274} 6275 6276/// \brief Given a constructor and the set of arguments provided for the 6277/// constructor, convert the arguments and add any required default arguments 6278/// to form a proper call to this constructor. 6279/// 6280/// \returns true if an error occurred, false otherwise. 6281bool 6282Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6283 MultiExprArg ArgsPtr, 6284 SourceLocation Loc, 6285 ASTOwningVector<Expr*> &ConvertedArgs) { 6286 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6287 unsigned NumArgs = ArgsPtr.size(); 6288 Expr **Args = (Expr **)ArgsPtr.get(); 6289 6290 const FunctionProtoType *Proto 6291 = Constructor->getType()->getAs<FunctionProtoType>(); 6292 assert(Proto && "Constructor without a prototype?"); 6293 unsigned NumArgsInProto = Proto->getNumArgs(); 6294 6295 // If too few arguments are available, we'll fill in the rest with defaults. 6296 if (NumArgs < NumArgsInProto) 6297 ConvertedArgs.reserve(NumArgsInProto); 6298 else 6299 ConvertedArgs.reserve(NumArgs); 6300 6301 VariadicCallType CallType = 6302 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6303 llvm::SmallVector<Expr *, 8> AllArgs; 6304 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6305 Proto, 0, Args, NumArgs, AllArgs, 6306 CallType); 6307 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6308 ConvertedArgs.push_back(AllArgs[i]); 6309 return Invalid; 6310} 6311 6312static inline bool 6313CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6314 const FunctionDecl *FnDecl) { 6315 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6316 if (isa<NamespaceDecl>(DC)) { 6317 return SemaRef.Diag(FnDecl->getLocation(), 6318 diag::err_operator_new_delete_declared_in_namespace) 6319 << FnDecl->getDeclName(); 6320 } 6321 6322 if (isa<TranslationUnitDecl>(DC) && 6323 FnDecl->getStorageClass() == SC_Static) { 6324 return SemaRef.Diag(FnDecl->getLocation(), 6325 diag::err_operator_new_delete_declared_static) 6326 << FnDecl->getDeclName(); 6327 } 6328 6329 return false; 6330} 6331 6332static inline bool 6333CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6334 CanQualType ExpectedResultType, 6335 CanQualType ExpectedFirstParamType, 6336 unsigned DependentParamTypeDiag, 6337 unsigned InvalidParamTypeDiag) { 6338 QualType ResultType = 6339 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6340 6341 // Check that the result type is not dependent. 6342 if (ResultType->isDependentType()) 6343 return SemaRef.Diag(FnDecl->getLocation(), 6344 diag::err_operator_new_delete_dependent_result_type) 6345 << FnDecl->getDeclName() << ExpectedResultType; 6346 6347 // Check that the result type is what we expect. 6348 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6349 return SemaRef.Diag(FnDecl->getLocation(), 6350 diag::err_operator_new_delete_invalid_result_type) 6351 << FnDecl->getDeclName() << ExpectedResultType; 6352 6353 // A function template must have at least 2 parameters. 6354 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6355 return SemaRef.Diag(FnDecl->getLocation(), 6356 diag::err_operator_new_delete_template_too_few_parameters) 6357 << FnDecl->getDeclName(); 6358 6359 // The function decl must have at least 1 parameter. 6360 if (FnDecl->getNumParams() == 0) 6361 return SemaRef.Diag(FnDecl->getLocation(), 6362 diag::err_operator_new_delete_too_few_parameters) 6363 << FnDecl->getDeclName(); 6364 6365 // Check the the first parameter type is not dependent. 6366 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6367 if (FirstParamType->isDependentType()) 6368 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6369 << FnDecl->getDeclName() << ExpectedFirstParamType; 6370 6371 // Check that the first parameter type is what we expect. 6372 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6373 ExpectedFirstParamType) 6374 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6375 << FnDecl->getDeclName() << ExpectedFirstParamType; 6376 6377 return false; 6378} 6379 6380static bool 6381CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6382 // C++ [basic.stc.dynamic.allocation]p1: 6383 // A program is ill-formed if an allocation function is declared in a 6384 // namespace scope other than global scope or declared static in global 6385 // scope. 6386 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6387 return true; 6388 6389 CanQualType SizeTy = 6390 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6391 6392 // C++ [basic.stc.dynamic.allocation]p1: 6393 // The return type shall be void*. The first parameter shall have type 6394 // std::size_t. 6395 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6396 SizeTy, 6397 diag::err_operator_new_dependent_param_type, 6398 diag::err_operator_new_param_type)) 6399 return true; 6400 6401 // C++ [basic.stc.dynamic.allocation]p1: 6402 // The first parameter shall not have an associated default argument. 6403 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6404 return SemaRef.Diag(FnDecl->getLocation(), 6405 diag::err_operator_new_default_arg) 6406 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6407 6408 return false; 6409} 6410 6411static bool 6412CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6413 // C++ [basic.stc.dynamic.deallocation]p1: 6414 // A program is ill-formed if deallocation functions are declared in a 6415 // namespace scope other than global scope or declared static in global 6416 // scope. 6417 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6418 return true; 6419 6420 // C++ [basic.stc.dynamic.deallocation]p2: 6421 // Each deallocation function shall return void and its first parameter 6422 // shall be void*. 6423 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6424 SemaRef.Context.VoidPtrTy, 6425 diag::err_operator_delete_dependent_param_type, 6426 diag::err_operator_delete_param_type)) 6427 return true; 6428 6429 return false; 6430} 6431 6432/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6433/// of this overloaded operator is well-formed. If so, returns false; 6434/// otherwise, emits appropriate diagnostics and returns true. 6435bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6436 assert(FnDecl && FnDecl->isOverloadedOperator() && 6437 "Expected an overloaded operator declaration"); 6438 6439 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6440 6441 // C++ [over.oper]p5: 6442 // The allocation and deallocation functions, operator new, 6443 // operator new[], operator delete and operator delete[], are 6444 // described completely in 3.7.3. The attributes and restrictions 6445 // found in the rest of this subclause do not apply to them unless 6446 // explicitly stated in 3.7.3. 6447 if (Op == OO_Delete || Op == OO_Array_Delete) 6448 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6449 6450 if (Op == OO_New || Op == OO_Array_New) 6451 return CheckOperatorNewDeclaration(*this, FnDecl); 6452 6453 // C++ [over.oper]p6: 6454 // An operator function shall either be a non-static member 6455 // function or be a non-member function and have at least one 6456 // parameter whose type is a class, a reference to a class, an 6457 // enumeration, or a reference to an enumeration. 6458 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6459 if (MethodDecl->isStatic()) 6460 return Diag(FnDecl->getLocation(), 6461 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6462 } else { 6463 bool ClassOrEnumParam = false; 6464 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6465 ParamEnd = FnDecl->param_end(); 6466 Param != ParamEnd; ++Param) { 6467 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6468 if (ParamType->isDependentType() || ParamType->isRecordType() || 6469 ParamType->isEnumeralType()) { 6470 ClassOrEnumParam = true; 6471 break; 6472 } 6473 } 6474 6475 if (!ClassOrEnumParam) 6476 return Diag(FnDecl->getLocation(), 6477 diag::err_operator_overload_needs_class_or_enum) 6478 << FnDecl->getDeclName(); 6479 } 6480 6481 // C++ [over.oper]p8: 6482 // An operator function cannot have default arguments (8.3.6), 6483 // except where explicitly stated below. 6484 // 6485 // Only the function-call operator allows default arguments 6486 // (C++ [over.call]p1). 6487 if (Op != OO_Call) { 6488 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6489 Param != FnDecl->param_end(); ++Param) { 6490 if ((*Param)->hasDefaultArg()) 6491 return Diag((*Param)->getLocation(), 6492 diag::err_operator_overload_default_arg) 6493 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6494 } 6495 } 6496 6497 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6498 { false, false, false } 6499#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6500 , { Unary, Binary, MemberOnly } 6501#include "clang/Basic/OperatorKinds.def" 6502 }; 6503 6504 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6505 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6506 bool MustBeMemberOperator = OperatorUses[Op][2]; 6507 6508 // C++ [over.oper]p8: 6509 // [...] Operator functions cannot have more or fewer parameters 6510 // than the number required for the corresponding operator, as 6511 // described in the rest of this subclause. 6512 unsigned NumParams = FnDecl->getNumParams() 6513 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6514 if (Op != OO_Call && 6515 ((NumParams == 1 && !CanBeUnaryOperator) || 6516 (NumParams == 2 && !CanBeBinaryOperator) || 6517 (NumParams < 1) || (NumParams > 2))) { 6518 // We have the wrong number of parameters. 6519 unsigned ErrorKind; 6520 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6521 ErrorKind = 2; // 2 -> unary or binary. 6522 } else if (CanBeUnaryOperator) { 6523 ErrorKind = 0; // 0 -> unary 6524 } else { 6525 assert(CanBeBinaryOperator && 6526 "All non-call overloaded operators are unary or binary!"); 6527 ErrorKind = 1; // 1 -> binary 6528 } 6529 6530 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6531 << FnDecl->getDeclName() << NumParams << ErrorKind; 6532 } 6533 6534 // Overloaded operators other than operator() cannot be variadic. 6535 if (Op != OO_Call && 6536 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6537 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6538 << FnDecl->getDeclName(); 6539 } 6540 6541 // Some operators must be non-static member functions. 6542 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6543 return Diag(FnDecl->getLocation(), 6544 diag::err_operator_overload_must_be_member) 6545 << FnDecl->getDeclName(); 6546 } 6547 6548 // C++ [over.inc]p1: 6549 // The user-defined function called operator++ implements the 6550 // prefix and postfix ++ operator. If this function is a member 6551 // function with no parameters, or a non-member function with one 6552 // parameter of class or enumeration type, it defines the prefix 6553 // increment operator ++ for objects of that type. If the function 6554 // is a member function with one parameter (which shall be of type 6555 // int) or a non-member function with two parameters (the second 6556 // of which shall be of type int), it defines the postfix 6557 // increment operator ++ for objects of that type. 6558 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6559 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6560 bool ParamIsInt = false; 6561 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6562 ParamIsInt = BT->getKind() == BuiltinType::Int; 6563 6564 if (!ParamIsInt) 6565 return Diag(LastParam->getLocation(), 6566 diag::err_operator_overload_post_incdec_must_be_int) 6567 << LastParam->getType() << (Op == OO_MinusMinus); 6568 } 6569 6570 return false; 6571} 6572 6573/// CheckLiteralOperatorDeclaration - Check whether the declaration 6574/// of this literal operator function is well-formed. If so, returns 6575/// false; otherwise, emits appropriate diagnostics and returns true. 6576bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6577 DeclContext *DC = FnDecl->getDeclContext(); 6578 Decl::Kind Kind = DC->getDeclKind(); 6579 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6580 Kind != Decl::LinkageSpec) { 6581 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6582 << FnDecl->getDeclName(); 6583 return true; 6584 } 6585 6586 bool Valid = false; 6587 6588 // template <char...> type operator "" name() is the only valid template 6589 // signature, and the only valid signature with no parameters. 6590 if (FnDecl->param_size() == 0) { 6591 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6592 // Must have only one template parameter 6593 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6594 if (Params->size() == 1) { 6595 NonTypeTemplateParmDecl *PmDecl = 6596 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6597 6598 // The template parameter must be a char parameter pack. 6599 if (PmDecl && PmDecl->isTemplateParameterPack() && 6600 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6601 Valid = true; 6602 } 6603 } 6604 } else { 6605 // Check the first parameter 6606 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6607 6608 QualType T = (*Param)->getType(); 6609 6610 // unsigned long long int, long double, and any character type are allowed 6611 // as the only parameters. 6612 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6613 Context.hasSameType(T, Context.LongDoubleTy) || 6614 Context.hasSameType(T, Context.CharTy) || 6615 Context.hasSameType(T, Context.WCharTy) || 6616 Context.hasSameType(T, Context.Char16Ty) || 6617 Context.hasSameType(T, Context.Char32Ty)) { 6618 if (++Param == FnDecl->param_end()) 6619 Valid = true; 6620 goto FinishedParams; 6621 } 6622 6623 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6624 const PointerType *PT = T->getAs<PointerType>(); 6625 if (!PT) 6626 goto FinishedParams; 6627 T = PT->getPointeeType(); 6628 if (!T.isConstQualified()) 6629 goto FinishedParams; 6630 T = T.getUnqualifiedType(); 6631 6632 // Move on to the second parameter; 6633 ++Param; 6634 6635 // If there is no second parameter, the first must be a const char * 6636 if (Param == FnDecl->param_end()) { 6637 if (Context.hasSameType(T, Context.CharTy)) 6638 Valid = true; 6639 goto FinishedParams; 6640 } 6641 6642 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6643 // are allowed as the first parameter to a two-parameter function 6644 if (!(Context.hasSameType(T, Context.CharTy) || 6645 Context.hasSameType(T, Context.WCharTy) || 6646 Context.hasSameType(T, Context.Char16Ty) || 6647 Context.hasSameType(T, Context.Char32Ty))) 6648 goto FinishedParams; 6649 6650 // The second and final parameter must be an std::size_t 6651 T = (*Param)->getType().getUnqualifiedType(); 6652 if (Context.hasSameType(T, Context.getSizeType()) && 6653 ++Param == FnDecl->param_end()) 6654 Valid = true; 6655 } 6656 6657 // FIXME: This diagnostic is absolutely terrible. 6658FinishedParams: 6659 if (!Valid) { 6660 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6661 << FnDecl->getDeclName(); 6662 return true; 6663 } 6664 6665 return false; 6666} 6667 6668/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6669/// linkage specification, including the language and (if present) 6670/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6671/// the location of the language string literal, which is provided 6672/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6673/// the '{' brace. Otherwise, this linkage specification does not 6674/// have any braces. 6675Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6676 SourceLocation LangLoc, 6677 llvm::StringRef Lang, 6678 SourceLocation LBraceLoc) { 6679 LinkageSpecDecl::LanguageIDs Language; 6680 if (Lang == "\"C\"") 6681 Language = LinkageSpecDecl::lang_c; 6682 else if (Lang == "\"C++\"") 6683 Language = LinkageSpecDecl::lang_cxx; 6684 else { 6685 Diag(LangLoc, diag::err_bad_language); 6686 return 0; 6687 } 6688 6689 // FIXME: Add all the various semantics of linkage specifications 6690 6691 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6692 ExternLoc, LangLoc, Language); 6693 CurContext->addDecl(D); 6694 PushDeclContext(S, D); 6695 return D; 6696} 6697 6698/// ActOnFinishLinkageSpecification - Complete the definition of 6699/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6700/// valid, it's the position of the closing '}' brace in a linkage 6701/// specification that uses braces. 6702Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6703 Decl *LinkageSpec, 6704 SourceLocation RBraceLoc) { 6705 if (LinkageSpec) { 6706 if (RBraceLoc.isValid()) { 6707 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6708 LSDecl->setRBraceLoc(RBraceLoc); 6709 } 6710 PopDeclContext(); 6711 } 6712 return LinkageSpec; 6713} 6714 6715/// \brief Perform semantic analysis for the variable declaration that 6716/// occurs within a C++ catch clause, returning the newly-created 6717/// variable. 6718VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6719 TypeSourceInfo *TInfo, 6720 SourceLocation StartLoc, 6721 SourceLocation Loc, 6722 IdentifierInfo *Name) { 6723 bool Invalid = false; 6724 QualType ExDeclType = TInfo->getType(); 6725 6726 // Arrays and functions decay. 6727 if (ExDeclType->isArrayType()) 6728 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6729 else if (ExDeclType->isFunctionType()) 6730 ExDeclType = Context.getPointerType(ExDeclType); 6731 6732 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6733 // The exception-declaration shall not denote a pointer or reference to an 6734 // incomplete type, other than [cv] void*. 6735 // N2844 forbids rvalue references. 6736 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6737 Diag(Loc, diag::err_catch_rvalue_ref); 6738 Invalid = true; 6739 } 6740 6741 // GCC allows catching pointers and references to incomplete types 6742 // as an extension; so do we, but we warn by default. 6743 6744 QualType BaseType = ExDeclType; 6745 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6746 unsigned DK = diag::err_catch_incomplete; 6747 bool IncompleteCatchIsInvalid = true; 6748 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6749 BaseType = Ptr->getPointeeType(); 6750 Mode = 1; 6751 DK = diag::ext_catch_incomplete_ptr; 6752 IncompleteCatchIsInvalid = false; 6753 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6754 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6755 BaseType = Ref->getPointeeType(); 6756 Mode = 2; 6757 DK = diag::ext_catch_incomplete_ref; 6758 IncompleteCatchIsInvalid = false; 6759 } 6760 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6761 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6762 IncompleteCatchIsInvalid) 6763 Invalid = true; 6764 6765 if (!Invalid && !ExDeclType->isDependentType() && 6766 RequireNonAbstractType(Loc, ExDeclType, 6767 diag::err_abstract_type_in_decl, 6768 AbstractVariableType)) 6769 Invalid = true; 6770 6771 // Only the non-fragile NeXT runtime currently supports C++ catches 6772 // of ObjC types, and no runtime supports catching ObjC types by value. 6773 if (!Invalid && getLangOptions().ObjC1) { 6774 QualType T = ExDeclType; 6775 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6776 T = RT->getPointeeType(); 6777 6778 if (T->isObjCObjectType()) { 6779 Diag(Loc, diag::err_objc_object_catch); 6780 Invalid = true; 6781 } else if (T->isObjCObjectPointerType()) { 6782 if (!getLangOptions().ObjCNonFragileABI) { 6783 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6784 Invalid = true; 6785 } 6786 } 6787 } 6788 6789 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6790 ExDeclType, TInfo, SC_None, SC_None); 6791 ExDecl->setExceptionVariable(true); 6792 6793 if (!Invalid) { 6794 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6795 // C++ [except.handle]p16: 6796 // The object declared in an exception-declaration or, if the 6797 // exception-declaration does not specify a name, a temporary (12.2) is 6798 // copy-initialized (8.5) from the exception object. [...] 6799 // The object is destroyed when the handler exits, after the destruction 6800 // of any automatic objects initialized within the handler. 6801 // 6802 // We just pretend to initialize the object with itself, then make sure 6803 // it can be destroyed later. 6804 QualType initType = ExDeclType; 6805 6806 InitializedEntity entity = 6807 InitializedEntity::InitializeVariable(ExDecl); 6808 InitializationKind initKind = 6809 InitializationKind::CreateCopy(Loc, SourceLocation()); 6810 6811 Expr *opaqueValue = 6812 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6813 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6814 ExprResult result = sequence.Perform(*this, entity, initKind, 6815 MultiExprArg(&opaqueValue, 1)); 6816 if (result.isInvalid()) 6817 Invalid = true; 6818 else { 6819 // If the constructor used was non-trivial, set this as the 6820 // "initializer". 6821 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6822 if (!construct->getConstructor()->isTrivial()) { 6823 Expr *init = MaybeCreateExprWithCleanups(construct); 6824 ExDecl->setInit(init); 6825 } 6826 6827 // And make sure it's destructable. 6828 FinalizeVarWithDestructor(ExDecl, recordType); 6829 } 6830 } 6831 } 6832 6833 if (Invalid) 6834 ExDecl->setInvalidDecl(); 6835 6836 return ExDecl; 6837} 6838 6839/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6840/// handler. 6841Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6842 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6843 bool Invalid = D.isInvalidType(); 6844 6845 // Check for unexpanded parameter packs. 6846 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6847 UPPC_ExceptionType)) { 6848 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6849 D.getIdentifierLoc()); 6850 Invalid = true; 6851 } 6852 6853 IdentifierInfo *II = D.getIdentifier(); 6854 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6855 LookupOrdinaryName, 6856 ForRedeclaration)) { 6857 // The scope should be freshly made just for us. There is just no way 6858 // it contains any previous declaration. 6859 assert(!S->isDeclScope(PrevDecl)); 6860 if (PrevDecl->isTemplateParameter()) { 6861 // Maybe we will complain about the shadowed template parameter. 6862 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6863 } 6864 } 6865 6866 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6867 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6868 << D.getCXXScopeSpec().getRange(); 6869 Invalid = true; 6870 } 6871 6872 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6873 D.getSourceRange().getBegin(), 6874 D.getIdentifierLoc(), 6875 D.getIdentifier()); 6876 if (Invalid) 6877 ExDecl->setInvalidDecl(); 6878 6879 // Add the exception declaration into this scope. 6880 if (II) 6881 PushOnScopeChains(ExDecl, S); 6882 else 6883 CurContext->addDecl(ExDecl); 6884 6885 ProcessDeclAttributes(S, ExDecl, D); 6886 return ExDecl; 6887} 6888 6889Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 6890 Expr *AssertExpr, 6891 Expr *AssertMessageExpr_, 6892 SourceLocation RParenLoc) { 6893 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6894 6895 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6896 llvm::APSInt Value(32); 6897 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6898 Diag(StaticAssertLoc, 6899 diag::err_static_assert_expression_is_not_constant) << 6900 AssertExpr->getSourceRange(); 6901 return 0; 6902 } 6903 6904 if (Value == 0) { 6905 Diag(StaticAssertLoc, diag::err_static_assert_failed) 6906 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6907 } 6908 } 6909 6910 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6911 return 0; 6912 6913 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 6914 AssertExpr, AssertMessage, RParenLoc); 6915 6916 CurContext->addDecl(Decl); 6917 return Decl; 6918} 6919 6920/// \brief Perform semantic analysis of the given friend type declaration. 6921/// 6922/// \returns A friend declaration that. 6923FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6924 TypeSourceInfo *TSInfo) { 6925 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6926 6927 QualType T = TSInfo->getType(); 6928 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6929 6930 if (!getLangOptions().CPlusPlus0x) { 6931 // C++03 [class.friend]p2: 6932 // An elaborated-type-specifier shall be used in a friend declaration 6933 // for a class.* 6934 // 6935 // * The class-key of the elaborated-type-specifier is required. 6936 if (!ActiveTemplateInstantiations.empty()) { 6937 // Do not complain about the form of friend template types during 6938 // template instantiation; we will already have complained when the 6939 // template was declared. 6940 } else if (!T->isElaboratedTypeSpecifier()) { 6941 // If we evaluated the type to a record type, suggest putting 6942 // a tag in front. 6943 if (const RecordType *RT = T->getAs<RecordType>()) { 6944 RecordDecl *RD = RT->getDecl(); 6945 6946 std::string InsertionText = std::string(" ") + RD->getKindName(); 6947 6948 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6949 << (unsigned) RD->getTagKind() 6950 << T 6951 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6952 InsertionText); 6953 } else { 6954 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6955 << T 6956 << SourceRange(FriendLoc, TypeRange.getEnd()); 6957 } 6958 } else if (T->getAs<EnumType>()) { 6959 Diag(FriendLoc, diag::ext_enum_friend) 6960 << T 6961 << SourceRange(FriendLoc, TypeRange.getEnd()); 6962 } 6963 } 6964 6965 // C++0x [class.friend]p3: 6966 // If the type specifier in a friend declaration designates a (possibly 6967 // cv-qualified) class type, that class is declared as a friend; otherwise, 6968 // the friend declaration is ignored. 6969 6970 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6971 // in [class.friend]p3 that we do not implement. 6972 6973 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6974} 6975 6976/// Handle a friend tag declaration where the scope specifier was 6977/// templated. 6978Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6979 unsigned TagSpec, SourceLocation TagLoc, 6980 CXXScopeSpec &SS, 6981 IdentifierInfo *Name, SourceLocation NameLoc, 6982 AttributeList *Attr, 6983 MultiTemplateParamsArg TempParamLists) { 6984 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6985 6986 bool isExplicitSpecialization = false; 6987 bool Invalid = false; 6988 6989 if (TemplateParameterList *TemplateParams 6990 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6991 TempParamLists.get(), 6992 TempParamLists.size(), 6993 /*friend*/ true, 6994 isExplicitSpecialization, 6995 Invalid)) { 6996 if (TemplateParams->size() > 0) { 6997 // This is a declaration of a class template. 6998 if (Invalid) 6999 return 0; 7000 7001 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7002 SS, Name, NameLoc, Attr, 7003 TemplateParams, AS_public, 7004 TempParamLists.size() - 1, 7005 (TemplateParameterList**) TempParamLists.release()).take(); 7006 } else { 7007 // The "template<>" header is extraneous. 7008 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7009 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7010 isExplicitSpecialization = true; 7011 } 7012 } 7013 7014 if (Invalid) return 0; 7015 7016 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7017 7018 bool isAllExplicitSpecializations = true; 7019 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7020 if (TempParamLists.get()[I]->size()) { 7021 isAllExplicitSpecializations = false; 7022 break; 7023 } 7024 } 7025 7026 // FIXME: don't ignore attributes. 7027 7028 // If it's explicit specializations all the way down, just forget 7029 // about the template header and build an appropriate non-templated 7030 // friend. TODO: for source fidelity, remember the headers. 7031 if (isAllExplicitSpecializations) { 7032 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7033 ElaboratedTypeKeyword Keyword 7034 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7035 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7036 *Name, NameLoc); 7037 if (T.isNull()) 7038 return 0; 7039 7040 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7041 if (isa<DependentNameType>(T)) { 7042 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7043 TL.setKeywordLoc(TagLoc); 7044 TL.setQualifierLoc(QualifierLoc); 7045 TL.setNameLoc(NameLoc); 7046 } else { 7047 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7048 TL.setKeywordLoc(TagLoc); 7049 TL.setQualifierLoc(QualifierLoc); 7050 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7051 } 7052 7053 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7054 TSI, FriendLoc); 7055 Friend->setAccess(AS_public); 7056 CurContext->addDecl(Friend); 7057 return Friend; 7058 } 7059 7060 // Handle the case of a templated-scope friend class. e.g. 7061 // template <class T> class A<T>::B; 7062 // FIXME: we don't support these right now. 7063 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7064 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7065 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7066 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7067 TL.setKeywordLoc(TagLoc); 7068 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7069 TL.setNameLoc(NameLoc); 7070 7071 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7072 TSI, FriendLoc); 7073 Friend->setAccess(AS_public); 7074 Friend->setUnsupportedFriend(true); 7075 CurContext->addDecl(Friend); 7076 return Friend; 7077} 7078 7079 7080/// Handle a friend type declaration. This works in tandem with 7081/// ActOnTag. 7082/// 7083/// Notes on friend class templates: 7084/// 7085/// We generally treat friend class declarations as if they were 7086/// declaring a class. So, for example, the elaborated type specifier 7087/// in a friend declaration is required to obey the restrictions of a 7088/// class-head (i.e. no typedefs in the scope chain), template 7089/// parameters are required to match up with simple template-ids, &c. 7090/// However, unlike when declaring a template specialization, it's 7091/// okay to refer to a template specialization without an empty 7092/// template parameter declaration, e.g. 7093/// friend class A<T>::B<unsigned>; 7094/// We permit this as a special case; if there are any template 7095/// parameters present at all, require proper matching, i.e. 7096/// template <> template <class T> friend class A<int>::B; 7097Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7098 MultiTemplateParamsArg TempParams) { 7099 SourceLocation Loc = DS.getSourceRange().getBegin(); 7100 7101 assert(DS.isFriendSpecified()); 7102 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7103 7104 // Try to convert the decl specifier to a type. This works for 7105 // friend templates because ActOnTag never produces a ClassTemplateDecl 7106 // for a TUK_Friend. 7107 Declarator TheDeclarator(DS, Declarator::MemberContext); 7108 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7109 QualType T = TSI->getType(); 7110 if (TheDeclarator.isInvalidType()) 7111 return 0; 7112 7113 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7114 return 0; 7115 7116 // This is definitely an error in C++98. It's probably meant to 7117 // be forbidden in C++0x, too, but the specification is just 7118 // poorly written. 7119 // 7120 // The problem is with declarations like the following: 7121 // template <T> friend A<T>::foo; 7122 // where deciding whether a class C is a friend or not now hinges 7123 // on whether there exists an instantiation of A that causes 7124 // 'foo' to equal C. There are restrictions on class-heads 7125 // (which we declare (by fiat) elaborated friend declarations to 7126 // be) that makes this tractable. 7127 // 7128 // FIXME: handle "template <> friend class A<T>;", which 7129 // is possibly well-formed? Who even knows? 7130 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7131 Diag(Loc, diag::err_tagless_friend_type_template) 7132 << DS.getSourceRange(); 7133 return 0; 7134 } 7135 7136 // C++98 [class.friend]p1: A friend of a class is a function 7137 // or class that is not a member of the class . . . 7138 // This is fixed in DR77, which just barely didn't make the C++03 7139 // deadline. It's also a very silly restriction that seriously 7140 // affects inner classes and which nobody else seems to implement; 7141 // thus we never diagnose it, not even in -pedantic. 7142 // 7143 // But note that we could warn about it: it's always useless to 7144 // friend one of your own members (it's not, however, worthless to 7145 // friend a member of an arbitrary specialization of your template). 7146 7147 Decl *D; 7148 if (unsigned NumTempParamLists = TempParams.size()) 7149 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7150 NumTempParamLists, 7151 TempParams.release(), 7152 TSI, 7153 DS.getFriendSpecLoc()); 7154 else 7155 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7156 7157 if (!D) 7158 return 0; 7159 7160 D->setAccess(AS_public); 7161 CurContext->addDecl(D); 7162 7163 return D; 7164} 7165 7166Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7167 MultiTemplateParamsArg TemplateParams) { 7168 const DeclSpec &DS = D.getDeclSpec(); 7169 7170 assert(DS.isFriendSpecified()); 7171 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7172 7173 SourceLocation Loc = D.getIdentifierLoc(); 7174 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7175 QualType T = TInfo->getType(); 7176 7177 // C++ [class.friend]p1 7178 // A friend of a class is a function or class.... 7179 // Note that this sees through typedefs, which is intended. 7180 // It *doesn't* see through dependent types, which is correct 7181 // according to [temp.arg.type]p3: 7182 // If a declaration acquires a function type through a 7183 // type dependent on a template-parameter and this causes 7184 // a declaration that does not use the syntactic form of a 7185 // function declarator to have a function type, the program 7186 // is ill-formed. 7187 if (!T->isFunctionType()) { 7188 Diag(Loc, diag::err_unexpected_friend); 7189 7190 // It might be worthwhile to try to recover by creating an 7191 // appropriate declaration. 7192 return 0; 7193 } 7194 7195 // C++ [namespace.memdef]p3 7196 // - If a friend declaration in a non-local class first declares a 7197 // class or function, the friend class or function is a member 7198 // of the innermost enclosing namespace. 7199 // - The name of the friend is not found by simple name lookup 7200 // until a matching declaration is provided in that namespace 7201 // scope (either before or after the class declaration granting 7202 // friendship). 7203 // - If a friend function is called, its name may be found by the 7204 // name lookup that considers functions from namespaces and 7205 // classes associated with the types of the function arguments. 7206 // - When looking for a prior declaration of a class or a function 7207 // declared as a friend, scopes outside the innermost enclosing 7208 // namespace scope are not considered. 7209 7210 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7211 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7212 DeclarationName Name = NameInfo.getName(); 7213 assert(Name); 7214 7215 // Check for unexpanded parameter packs. 7216 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7217 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7218 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7219 return 0; 7220 7221 // The context we found the declaration in, or in which we should 7222 // create the declaration. 7223 DeclContext *DC; 7224 Scope *DCScope = S; 7225 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7226 ForRedeclaration); 7227 7228 // FIXME: there are different rules in local classes 7229 7230 // There are four cases here. 7231 // - There's no scope specifier, in which case we just go to the 7232 // appropriate scope and look for a function or function template 7233 // there as appropriate. 7234 // Recover from invalid scope qualifiers as if they just weren't there. 7235 if (SS.isInvalid() || !SS.isSet()) { 7236 // C++0x [namespace.memdef]p3: 7237 // If the name in a friend declaration is neither qualified nor 7238 // a template-id and the declaration is a function or an 7239 // elaborated-type-specifier, the lookup to determine whether 7240 // the entity has been previously declared shall not consider 7241 // any scopes outside the innermost enclosing namespace. 7242 // C++0x [class.friend]p11: 7243 // If a friend declaration appears in a local class and the name 7244 // specified is an unqualified name, a prior declaration is 7245 // looked up without considering scopes that are outside the 7246 // innermost enclosing non-class scope. For a friend function 7247 // declaration, if there is no prior declaration, the program is 7248 // ill-formed. 7249 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7250 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7251 7252 // Find the appropriate context according to the above. 7253 DC = CurContext; 7254 while (true) { 7255 // Skip class contexts. If someone can cite chapter and verse 7256 // for this behavior, that would be nice --- it's what GCC and 7257 // EDG do, and it seems like a reasonable intent, but the spec 7258 // really only says that checks for unqualified existing 7259 // declarations should stop at the nearest enclosing namespace, 7260 // not that they should only consider the nearest enclosing 7261 // namespace. 7262 while (DC->isRecord()) 7263 DC = DC->getParent(); 7264 7265 LookupQualifiedName(Previous, DC); 7266 7267 // TODO: decide what we think about using declarations. 7268 if (isLocal || !Previous.empty()) 7269 break; 7270 7271 if (isTemplateId) { 7272 if (isa<TranslationUnitDecl>(DC)) break; 7273 } else { 7274 if (DC->isFileContext()) break; 7275 } 7276 DC = DC->getParent(); 7277 } 7278 7279 // C++ [class.friend]p1: A friend of a class is a function or 7280 // class that is not a member of the class . . . 7281 // C++0x changes this for both friend types and functions. 7282 // Most C++ 98 compilers do seem to give an error here, so 7283 // we do, too. 7284 if (!Previous.empty() && DC->Equals(CurContext) 7285 && !getLangOptions().CPlusPlus0x) 7286 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7287 7288 DCScope = getScopeForDeclContext(S, DC); 7289 7290 // - There's a non-dependent scope specifier, in which case we 7291 // compute it and do a previous lookup there for a function 7292 // or function template. 7293 } else if (!SS.getScopeRep()->isDependent()) { 7294 DC = computeDeclContext(SS); 7295 if (!DC) return 0; 7296 7297 if (RequireCompleteDeclContext(SS, DC)) return 0; 7298 7299 LookupQualifiedName(Previous, DC); 7300 7301 // Ignore things found implicitly in the wrong scope. 7302 // TODO: better diagnostics for this case. Suggesting the right 7303 // qualified scope would be nice... 7304 LookupResult::Filter F = Previous.makeFilter(); 7305 while (F.hasNext()) { 7306 NamedDecl *D = F.next(); 7307 if (!DC->InEnclosingNamespaceSetOf( 7308 D->getDeclContext()->getRedeclContext())) 7309 F.erase(); 7310 } 7311 F.done(); 7312 7313 if (Previous.empty()) { 7314 D.setInvalidType(); 7315 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7316 return 0; 7317 } 7318 7319 // C++ [class.friend]p1: A friend of a class is a function or 7320 // class that is not a member of the class . . . 7321 if (DC->Equals(CurContext)) 7322 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7323 7324 // - There's a scope specifier that does not match any template 7325 // parameter lists, in which case we use some arbitrary context, 7326 // create a method or method template, and wait for instantiation. 7327 // - There's a scope specifier that does match some template 7328 // parameter lists, which we don't handle right now. 7329 } else { 7330 DC = CurContext; 7331 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7332 } 7333 7334 if (!DC->isRecord()) { 7335 // This implies that it has to be an operator or function. 7336 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7337 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7338 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7339 Diag(Loc, diag::err_introducing_special_friend) << 7340 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7341 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7342 return 0; 7343 } 7344 } 7345 7346 bool Redeclaration = false; 7347 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7348 move(TemplateParams), 7349 IsDefinition, 7350 Redeclaration); 7351 if (!ND) return 0; 7352 7353 assert(ND->getDeclContext() == DC); 7354 assert(ND->getLexicalDeclContext() == CurContext); 7355 7356 // Add the function declaration to the appropriate lookup tables, 7357 // adjusting the redeclarations list as necessary. We don't 7358 // want to do this yet if the friending class is dependent. 7359 // 7360 // Also update the scope-based lookup if the target context's 7361 // lookup context is in lexical scope. 7362 if (!CurContext->isDependentContext()) { 7363 DC = DC->getRedeclContext(); 7364 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7365 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7366 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7367 } 7368 7369 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7370 D.getIdentifierLoc(), ND, 7371 DS.getFriendSpecLoc()); 7372 FrD->setAccess(AS_public); 7373 CurContext->addDecl(FrD); 7374 7375 if (ND->isInvalidDecl()) 7376 FrD->setInvalidDecl(); 7377 else { 7378 FunctionDecl *FD; 7379 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7380 FD = FTD->getTemplatedDecl(); 7381 else 7382 FD = cast<FunctionDecl>(ND); 7383 7384 // Mark templated-scope function declarations as unsupported. 7385 if (FD->getNumTemplateParameterLists()) 7386 FrD->setUnsupportedFriend(true); 7387 } 7388 7389 return ND; 7390} 7391 7392void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7393 AdjustDeclIfTemplate(Dcl); 7394 7395 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7396 if (!Fn) { 7397 Diag(DelLoc, diag::err_deleted_non_function); 7398 return; 7399 } 7400 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7401 Diag(DelLoc, diag::err_deleted_decl_not_first); 7402 Diag(Prev->getLocation(), diag::note_previous_declaration); 7403 // If the declaration wasn't the first, we delete the function anyway for 7404 // recovery. 7405 } 7406 Fn->setDeleted(); 7407} 7408 7409static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7410 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7411 Stmt *SubStmt = *CI; 7412 if (!SubStmt) 7413 continue; 7414 if (isa<ReturnStmt>(SubStmt)) 7415 Self.Diag(SubStmt->getSourceRange().getBegin(), 7416 diag::err_return_in_constructor_handler); 7417 if (!isa<Expr>(SubStmt)) 7418 SearchForReturnInStmt(Self, SubStmt); 7419 } 7420} 7421 7422void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7423 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7424 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7425 SearchForReturnInStmt(*this, Handler); 7426 } 7427} 7428 7429bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7430 const CXXMethodDecl *Old) { 7431 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7432 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7433 7434 if (Context.hasSameType(NewTy, OldTy) || 7435 NewTy->isDependentType() || OldTy->isDependentType()) 7436 return false; 7437 7438 // Check if the return types are covariant 7439 QualType NewClassTy, OldClassTy; 7440 7441 /// Both types must be pointers or references to classes. 7442 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7443 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7444 NewClassTy = NewPT->getPointeeType(); 7445 OldClassTy = OldPT->getPointeeType(); 7446 } 7447 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7448 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7449 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7450 NewClassTy = NewRT->getPointeeType(); 7451 OldClassTy = OldRT->getPointeeType(); 7452 } 7453 } 7454 } 7455 7456 // The return types aren't either both pointers or references to a class type. 7457 if (NewClassTy.isNull()) { 7458 Diag(New->getLocation(), 7459 diag::err_different_return_type_for_overriding_virtual_function) 7460 << New->getDeclName() << NewTy << OldTy; 7461 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7462 7463 return true; 7464 } 7465 7466 // C++ [class.virtual]p6: 7467 // If the return type of D::f differs from the return type of B::f, the 7468 // class type in the return type of D::f shall be complete at the point of 7469 // declaration of D::f or shall be the class type D. 7470 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7471 if (!RT->isBeingDefined() && 7472 RequireCompleteType(New->getLocation(), NewClassTy, 7473 PDiag(diag::err_covariant_return_incomplete) 7474 << New->getDeclName())) 7475 return true; 7476 } 7477 7478 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7479 // Check if the new class derives from the old class. 7480 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7481 Diag(New->getLocation(), 7482 diag::err_covariant_return_not_derived) 7483 << New->getDeclName() << NewTy << OldTy; 7484 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7485 return true; 7486 } 7487 7488 // Check if we the conversion from derived to base is valid. 7489 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7490 diag::err_covariant_return_inaccessible_base, 7491 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7492 // FIXME: Should this point to the return type? 7493 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7494 // FIXME: this note won't trigger for delayed access control 7495 // diagnostics, and it's impossible to get an undelayed error 7496 // here from access control during the original parse because 7497 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7498 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7499 return true; 7500 } 7501 } 7502 7503 // The qualifiers of the return types must be the same. 7504 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7505 Diag(New->getLocation(), 7506 diag::err_covariant_return_type_different_qualifications) 7507 << New->getDeclName() << NewTy << OldTy; 7508 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7509 return true; 7510 }; 7511 7512 7513 // The new class type must have the same or less qualifiers as the old type. 7514 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7515 Diag(New->getLocation(), 7516 diag::err_covariant_return_type_class_type_more_qualified) 7517 << New->getDeclName() << NewTy << OldTy; 7518 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7519 return true; 7520 }; 7521 7522 return false; 7523} 7524 7525/// \brief Mark the given method pure. 7526/// 7527/// \param Method the method to be marked pure. 7528/// 7529/// \param InitRange the source range that covers the "0" initializer. 7530bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7531 SourceLocation EndLoc = InitRange.getEnd(); 7532 if (EndLoc.isValid()) 7533 Method->setRangeEnd(EndLoc); 7534 7535 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7536 Method->setPure(); 7537 return false; 7538 } 7539 7540 if (!Method->isInvalidDecl()) 7541 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7542 << Method->getDeclName() << InitRange; 7543 return true; 7544} 7545 7546/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7547/// an initializer for the out-of-line declaration 'Dcl'. The scope 7548/// is a fresh scope pushed for just this purpose. 7549/// 7550/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7551/// static data member of class X, names should be looked up in the scope of 7552/// class X. 7553void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7554 // If there is no declaration, there was an error parsing it. 7555 if (D == 0) return; 7556 7557 // We should only get called for declarations with scope specifiers, like: 7558 // int foo::bar; 7559 assert(D->isOutOfLine()); 7560 EnterDeclaratorContext(S, D->getDeclContext()); 7561} 7562 7563/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7564/// initializer for the out-of-line declaration 'D'. 7565void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7566 // If there is no declaration, there was an error parsing it. 7567 if (D == 0) return; 7568 7569 assert(D->isOutOfLine()); 7570 ExitDeclaratorContext(S); 7571} 7572 7573/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7574/// C++ if/switch/while/for statement. 7575/// e.g: "if (int x = f()) {...}" 7576DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7577 // C++ 6.4p2: 7578 // The declarator shall not specify a function or an array. 7579 // The type-specifier-seq shall not contain typedef and shall not declare a 7580 // new class or enumeration. 7581 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7582 "Parser allowed 'typedef' as storage class of condition decl."); 7583 7584 TagDecl *OwnedTag = 0; 7585 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7586 QualType Ty = TInfo->getType(); 7587 7588 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7589 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7590 // would be created and CXXConditionDeclExpr wants a VarDecl. 7591 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7592 << D.getSourceRange(); 7593 return DeclResult(); 7594 } else if (OwnedTag && OwnedTag->isDefinition()) { 7595 // The type-specifier-seq shall not declare a new class or enumeration. 7596 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7597 } 7598 7599 Decl *Dcl = ActOnDeclarator(S, D); 7600 if (!Dcl) 7601 return DeclResult(); 7602 7603 return Dcl; 7604} 7605 7606void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7607 bool DefinitionRequired) { 7608 // Ignore any vtable uses in unevaluated operands or for classes that do 7609 // not have a vtable. 7610 if (!Class->isDynamicClass() || Class->isDependentContext() || 7611 CurContext->isDependentContext() || 7612 ExprEvalContexts.back().Context == Unevaluated) 7613 return; 7614 7615 // Try to insert this class into the map. 7616 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7617 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7618 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7619 if (!Pos.second) { 7620 // If we already had an entry, check to see if we are promoting this vtable 7621 // to required a definition. If so, we need to reappend to the VTableUses 7622 // list, since we may have already processed the first entry. 7623 if (DefinitionRequired && !Pos.first->second) { 7624 Pos.first->second = true; 7625 } else { 7626 // Otherwise, we can early exit. 7627 return; 7628 } 7629 } 7630 7631 // Local classes need to have their virtual members marked 7632 // immediately. For all other classes, we mark their virtual members 7633 // at the end of the translation unit. 7634 if (Class->isLocalClass()) 7635 MarkVirtualMembersReferenced(Loc, Class); 7636 else 7637 VTableUses.push_back(std::make_pair(Class, Loc)); 7638} 7639 7640bool Sema::DefineUsedVTables() { 7641 if (VTableUses.empty()) 7642 return false; 7643 7644 // Note: The VTableUses vector could grow as a result of marking 7645 // the members of a class as "used", so we check the size each 7646 // time through the loop and prefer indices (with are stable) to 7647 // iterators (which are not). 7648 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7649 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7650 if (!Class) 7651 continue; 7652 7653 SourceLocation Loc = VTableUses[I].second; 7654 7655 // If this class has a key function, but that key function is 7656 // defined in another translation unit, we don't need to emit the 7657 // vtable even though we're using it. 7658 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7659 if (KeyFunction && !KeyFunction->hasBody()) { 7660 switch (KeyFunction->getTemplateSpecializationKind()) { 7661 case TSK_Undeclared: 7662 case TSK_ExplicitSpecialization: 7663 case TSK_ExplicitInstantiationDeclaration: 7664 // The key function is in another translation unit. 7665 continue; 7666 7667 case TSK_ExplicitInstantiationDefinition: 7668 case TSK_ImplicitInstantiation: 7669 // We will be instantiating the key function. 7670 break; 7671 } 7672 } else if (!KeyFunction) { 7673 // If we have a class with no key function that is the subject 7674 // of an explicit instantiation declaration, suppress the 7675 // vtable; it will live with the explicit instantiation 7676 // definition. 7677 bool IsExplicitInstantiationDeclaration 7678 = Class->getTemplateSpecializationKind() 7679 == TSK_ExplicitInstantiationDeclaration; 7680 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7681 REnd = Class->redecls_end(); 7682 R != REnd; ++R) { 7683 TemplateSpecializationKind TSK 7684 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7685 if (TSK == TSK_ExplicitInstantiationDeclaration) 7686 IsExplicitInstantiationDeclaration = true; 7687 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7688 IsExplicitInstantiationDeclaration = false; 7689 break; 7690 } 7691 } 7692 7693 if (IsExplicitInstantiationDeclaration) 7694 continue; 7695 } 7696 7697 // Mark all of the virtual members of this class as referenced, so 7698 // that we can build a vtable. Then, tell the AST consumer that a 7699 // vtable for this class is required. 7700 MarkVirtualMembersReferenced(Loc, Class); 7701 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7702 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7703 7704 // Optionally warn if we're emitting a weak vtable. 7705 if (Class->getLinkage() == ExternalLinkage && 7706 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7707 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7708 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7709 } 7710 } 7711 VTableUses.clear(); 7712 7713 return true; 7714} 7715 7716void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7717 const CXXRecordDecl *RD) { 7718 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7719 e = RD->method_end(); i != e; ++i) { 7720 CXXMethodDecl *MD = *i; 7721 7722 // C++ [basic.def.odr]p2: 7723 // [...] A virtual member function is used if it is not pure. [...] 7724 if (MD->isVirtual() && !MD->isPure()) 7725 MarkDeclarationReferenced(Loc, MD); 7726 } 7727 7728 // Only classes that have virtual bases need a VTT. 7729 if (RD->getNumVBases() == 0) 7730 return; 7731 7732 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7733 e = RD->bases_end(); i != e; ++i) { 7734 const CXXRecordDecl *Base = 7735 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7736 if (Base->getNumVBases() == 0) 7737 continue; 7738 MarkVirtualMembersReferenced(Loc, Base); 7739 } 7740} 7741 7742/// SetIvarInitializers - This routine builds initialization ASTs for the 7743/// Objective-C implementation whose ivars need be initialized. 7744void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7745 if (!getLangOptions().CPlusPlus) 7746 return; 7747 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7748 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7749 CollectIvarsToConstructOrDestruct(OID, ivars); 7750 if (ivars.empty()) 7751 return; 7752 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7753 for (unsigned i = 0; i < ivars.size(); i++) { 7754 FieldDecl *Field = ivars[i]; 7755 if (Field->isInvalidDecl()) 7756 continue; 7757 7758 CXXCtorInitializer *Member; 7759 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7760 InitializationKind InitKind = 7761 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7762 7763 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7764 ExprResult MemberInit = 7765 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7766 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7767 // Note, MemberInit could actually come back empty if no initialization 7768 // is required (e.g., because it would call a trivial default constructor) 7769 if (!MemberInit.get() || MemberInit.isInvalid()) 7770 continue; 7771 7772 Member = 7773 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7774 SourceLocation(), 7775 MemberInit.takeAs<Expr>(), 7776 SourceLocation()); 7777 AllToInit.push_back(Member); 7778 7779 // Be sure that the destructor is accessible and is marked as referenced. 7780 if (const RecordType *RecordTy 7781 = Context.getBaseElementType(Field->getType()) 7782 ->getAs<RecordType>()) { 7783 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7784 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7785 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7786 CheckDestructorAccess(Field->getLocation(), Destructor, 7787 PDiag(diag::err_access_dtor_ivar) 7788 << Context.getBaseElementType(Field->getType())); 7789 } 7790 } 7791 } 7792 ObjCImplementation->setIvarInitializers(Context, 7793 AllToInit.data(), AllToInit.size()); 7794 } 7795} 7796