SemaDeclCXX.cpp revision c57c17dced5fb16a83a2ffb2b7e8c148df69ba5a
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/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++ [class.derived]p2: 525 // If a class is marked with the class-virt-specifier final and it appears 526 // as a base-type-specifier in a base-clause (10 class.derived), the program 527 // is ill-formed. 528 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 529 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 530 << CXXBaseDecl->getDeclName(); 531 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 532 << CXXBaseDecl->getDeclName(); 533 return 0; 534 } 535 536 if (BaseDecl->isInvalidDecl()) 537 Class->setInvalidDecl(); 538 539 // Create the base specifier. 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543} 544 545/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 546/// one entry in the base class list of a class specifier, for 547/// example: 548/// class foo : public bar, virtual private baz { 549/// 'public bar' and 'virtual private baz' are each base-specifiers. 550BaseResult 551Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 552 bool Virtual, AccessSpecifier Access, 553 ParsedType basetype, SourceLocation BaseLoc, 554 SourceLocation EllipsisLoc) { 555 if (!classdecl) 556 return true; 557 558 AdjustDeclIfTemplate(classdecl); 559 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 560 if (!Class) 561 return true; 562 563 TypeSourceInfo *TInfo = 0; 564 GetTypeFromParser(basetype, &TInfo); 565 566 if (EllipsisLoc.isInvalid() && 567 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 568 UPPC_BaseType)) 569 return true; 570 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, TInfo, 573 EllipsisLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 if (!Class->hasObjectMember()) { 600 if (const RecordType *FDTTy = 601 NewBaseType.getTypePtr()->getAs<RecordType>()) 602 if (FDTTy->getDecl()->hasObjectMember()) 603 Class->setHasObjectMember(true); 604 } 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651static CXXRecordDecl *GetClassForType(QualType T) { 652 if (const RecordType *RT = T->getAs<RecordType>()) 653 return cast<CXXRecordDecl>(RT->getDecl()); 654 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 655 return ICT->getDecl(); 656 else 657 return 0; 658} 659 660/// \brief Determine whether the type \p Derived is a C++ class that is 661/// derived from the type \p Base. 662bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 663 if (!getLangOptions().CPlusPlus) 664 return false; 665 666 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 667 if (!DerivedRD) 668 return false; 669 670 CXXRecordDecl *BaseRD = GetClassForType(Base); 671 if (!BaseRD) 672 return false; 673 674 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 675 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 return DerivedRD->isDerivedFrom(BaseRD, Paths); 693} 694 695void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 696 CXXCastPath &BasePathArray) { 697 assert(BasePathArray.empty() && "Base path array must be empty!"); 698 assert(Paths.isRecordingPaths() && "Must record paths!"); 699 700 const CXXBasePath &Path = Paths.front(); 701 702 // We first go backward and check if we have a virtual base. 703 // FIXME: It would be better if CXXBasePath had the base specifier for 704 // the nearest virtual base. 705 unsigned Start = 0; 706 for (unsigned I = Path.size(); I != 0; --I) { 707 if (Path[I - 1].Base->isVirtual()) { 708 Start = I - 1; 709 break; 710 } 711 } 712 713 // Now add all bases. 714 for (unsigned I = Start, E = Path.size(); I != E; ++I) 715 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 716} 717 718/// \brief Determine whether the given base path includes a virtual 719/// base class. 720bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 721 for (CXXCastPath::const_iterator B = BasePath.begin(), 722 BEnd = BasePath.end(); 723 B != BEnd; ++B) 724 if ((*B)->isVirtual()) 725 return true; 726 727 return false; 728} 729 730/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 731/// conversion (where Derived and Base are class types) is 732/// well-formed, meaning that the conversion is unambiguous (and 733/// that all of the base classes are accessible). Returns true 734/// and emits a diagnostic if the code is ill-formed, returns false 735/// otherwise. Loc is the location where this routine should point to 736/// if there is an error, and Range is the source range to highlight 737/// if there is an error. 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 unsigned InaccessibleBaseID, 741 unsigned AmbigiousBaseConvID, 742 SourceLocation Loc, SourceRange Range, 743 DeclarationName Name, 744 CXXCastPath *BasePath) { 745 // First, determine whether the path from Derived to Base is 746 // ambiguous. This is slightly more expensive than checking whether 747 // the Derived to Base conversion exists, because here we need to 748 // explore multiple paths to determine if there is an ambiguity. 749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 750 /*DetectVirtual=*/false); 751 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 752 assert(DerivationOkay && 753 "Can only be used with a derived-to-base conversion"); 754 (void)DerivationOkay; 755 756 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 757 if (InaccessibleBaseID) { 758 // Check that the base class can be accessed. 759 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 760 InaccessibleBaseID)) { 761 case AR_inaccessible: 762 return true; 763 case AR_accessible: 764 case AR_dependent: 765 case AR_delayed: 766 break; 767 } 768 } 769 770 // Build a base path if necessary. 771 if (BasePath) 772 BuildBasePathArray(Paths, *BasePath); 773 return false; 774 } 775 776 // We know that the derived-to-base conversion is ambiguous, and 777 // we're going to produce a diagnostic. Perform the derived-to-base 778 // search just one more time to compute all of the possible paths so 779 // that we can print them out. This is more expensive than any of 780 // the previous derived-to-base checks we've done, but at this point 781 // performance isn't as much of an issue. 782 Paths.clear(); 783 Paths.setRecordingPaths(true); 784 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 785 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 786 (void)StillOkay; 787 788 // Build up a textual representation of the ambiguous paths, e.g., 789 // D -> B -> A, that will be used to illustrate the ambiguous 790 // conversions in the diagnostic. We only print one of the paths 791 // to each base class subobject. 792 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 793 794 Diag(Loc, AmbigiousBaseConvID) 795 << Derived << Base << PathDisplayStr << Range << Name; 796 return true; 797} 798 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 SourceLocation Loc, SourceRange Range, 802 CXXCastPath *BasePath, 803 bool IgnoreAccess) { 804 return CheckDerivedToBaseConversion(Derived, Base, 805 IgnoreAccess ? 0 806 : diag::err_upcast_to_inaccessible_base, 807 diag::err_ambiguous_derived_to_base_conv, 808 Loc, Range, DeclarationName(), 809 BasePath); 810} 811 812 813/// @brief Builds a string representing ambiguous paths from a 814/// specific derived class to different subobjects of the same base 815/// class. 816/// 817/// This function builds a string that can be used in error messages 818/// to show the different paths that one can take through the 819/// inheritance hierarchy to go from the derived class to different 820/// subobjects of a base class. The result looks something like this: 821/// @code 822/// struct D -> struct B -> struct A 823/// struct D -> struct C -> struct A 824/// @endcode 825std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 826 std::string PathDisplayStr; 827 std::set<unsigned> DisplayedPaths; 828 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 829 Path != Paths.end(); ++Path) { 830 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 831 // We haven't displayed a path to this particular base 832 // class subobject yet. 833 PathDisplayStr += "\n "; 834 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 835 for (CXXBasePath::const_iterator Element = Path->begin(); 836 Element != Path->end(); ++Element) 837 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 838 } 839 } 840 841 return PathDisplayStr; 842} 843 844//===----------------------------------------------------------------------===// 845// C++ class member Handling 846//===----------------------------------------------------------------------===// 847 848/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 849Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 850 SourceLocation ASLoc, 851 SourceLocation ColonLoc) { 852 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 853 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 854 ASLoc, ColonLoc); 855 CurContext->addHiddenDecl(ASDecl); 856 return ASDecl; 857} 858 859/// CheckOverrideControl - Check C++0x override control semantics. 860void Sema::CheckOverrideControl(const Decl *D) { 861 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 862 if (!MD || !MD->isVirtual()) 863 return; 864 865 if (MD->isDependentContext()) 866 return; 867 868 // C++0x [class.virtual]p3: 869 // If a virtual function is marked with the virt-specifier override and does 870 // not override a member function of a base class, 871 // the program is ill-formed. 872 bool HasOverriddenMethods = 873 MD->begin_overridden_methods() != MD->end_overridden_methods(); 874 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 875 Diag(MD->getLocation(), 876 diag::err_function_marked_override_not_overriding) 877 << MD->getDeclName(); 878 return; 879 } 880 881 // C++0x [class.derived]p8: 882 // In a class definition marked with the class-virt-specifier explicit, 883 // if a virtual member function that is neither implicitly-declared nor a 884 // destructor overrides a member function of a base class and it is not 885 // marked with the virt-specifier override, the program is ill-formed. 886 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 887 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 888 llvm::SmallVector<const CXXMethodDecl*, 4> 889 OverriddenMethods(MD->begin_overridden_methods(), 890 MD->end_overridden_methods()); 891 892 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 893 << MD->getDeclName() 894 << (unsigned)OverriddenMethods.size(); 895 896 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 897 Diag(OverriddenMethods[I]->getLocation(), 898 diag::note_overridden_virtual_function); 899 } 900} 901 902/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 903/// function overrides a virtual member function marked 'final', according to 904/// C++0x [class.virtual]p3. 905bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 906 const CXXMethodDecl *Old) { 907 if (!Old->hasAttr<FinalAttr>()) 908 return false; 909 910 Diag(New->getLocation(), diag::err_final_function_overridden) 911 << New->getDeclName(); 912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 913 return true; 914} 915 916/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 917/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 918/// bitfield width if there is one and 'InitExpr' specifies the initializer if 919/// any. 920Decl * 921Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 922 MultiTemplateParamsArg TemplateParameterLists, 923 ExprTy *BW, const VirtSpecifiers &VS, 924 ExprTy *InitExpr, bool IsDefinition, 925 bool Deleted) { 926 const DeclSpec &DS = D.getDeclSpec(); 927 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 928 DeclarationName Name = NameInfo.getName(); 929 SourceLocation Loc = NameInfo.getLoc(); 930 931 // For anonymous bitfields, the location should point to the type. 932 if (Loc.isInvalid()) 933 Loc = D.getSourceRange().getBegin(); 934 935 Expr *BitWidth = static_cast<Expr*>(BW); 936 Expr *Init = static_cast<Expr*>(InitExpr); 937 938 assert(isa<CXXRecordDecl>(CurContext)); 939 assert(!DS.isFriendSpecified()); 940 941 bool isFunc = false; 942 if (D.isFunctionDeclarator()) 943 isFunc = true; 944 else if (D.getNumTypeObjects() == 0 && 945 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 946 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 947 isFunc = TDType->isFunctionType(); 948 } 949 950 // C++ 9.2p6: A member shall not be declared to have automatic storage 951 // duration (auto, register) or with the extern storage-class-specifier. 952 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 953 // data members and cannot be applied to names declared const or static, 954 // and cannot be applied to reference members. 955 switch (DS.getStorageClassSpec()) { 956 case DeclSpec::SCS_unspecified: 957 case DeclSpec::SCS_typedef: 958 case DeclSpec::SCS_static: 959 // FALL THROUGH. 960 break; 961 case DeclSpec::SCS_mutable: 962 if (isFunc) { 963 if (DS.getStorageClassSpecLoc().isValid()) 964 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 965 else 966 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 967 968 // FIXME: It would be nicer if the keyword was ignored only for this 969 // declarator. Otherwise we could get follow-up errors. 970 D.getMutableDeclSpec().ClearStorageClassSpecs(); 971 } 972 break; 973 default: 974 if (DS.getStorageClassSpecLoc().isValid()) 975 Diag(DS.getStorageClassSpecLoc(), 976 diag::err_storageclass_invalid_for_member); 977 else 978 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 979 D.getMutableDeclSpec().ClearStorageClassSpecs(); 980 } 981 982 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 983 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 984 !isFunc); 985 986 Decl *Member; 987 if (isInstField) { 988 CXXScopeSpec &SS = D.getCXXScopeSpec(); 989 990 991 if (SS.isSet() && !SS.isInvalid()) { 992 // The user provided a superfluous scope specifier inside a class 993 // definition: 994 // 995 // class X { 996 // int X::member; 997 // }; 998 DeclContext *DC = 0; 999 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1000 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1001 << Name << FixItHint::CreateRemoval(SS.getRange()); 1002 else 1003 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1004 << Name << SS.getRange(); 1005 1006 SS.clear(); 1007 } 1008 1009 // FIXME: Check for template parameters! 1010 // FIXME: Check that the name is an identifier! 1011 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1012 AS); 1013 assert(Member && "HandleField never returns null"); 1014 } else { 1015 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1016 if (!Member) { 1017 return 0; 1018 } 1019 1020 // Non-instance-fields can't have a bitfield. 1021 if (BitWidth) { 1022 if (Member->isInvalidDecl()) { 1023 // don't emit another diagnostic. 1024 } else if (isa<VarDecl>(Member)) { 1025 // C++ 9.6p3: A bit-field shall not be a static member. 1026 // "static member 'A' cannot be a bit-field" 1027 Diag(Loc, diag::err_static_not_bitfield) 1028 << Name << BitWidth->getSourceRange(); 1029 } else if (isa<TypedefDecl>(Member)) { 1030 // "typedef member 'x' cannot be a bit-field" 1031 Diag(Loc, diag::err_typedef_not_bitfield) 1032 << Name << BitWidth->getSourceRange(); 1033 } else { 1034 // A function typedef ("typedef int f(); f a;"). 1035 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1036 Diag(Loc, diag::err_not_integral_type_bitfield) 1037 << Name << cast<ValueDecl>(Member)->getType() 1038 << BitWidth->getSourceRange(); 1039 } 1040 1041 BitWidth = 0; 1042 Member->setInvalidDecl(); 1043 } 1044 1045 Member->setAccess(AS); 1046 1047 // If we have declared a member function template, set the access of the 1048 // templated declaration as well. 1049 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1050 FunTmpl->getTemplatedDecl()->setAccess(AS); 1051 } 1052 1053 if (VS.isOverrideSpecified()) { 1054 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1055 if (!MD || !MD->isVirtual()) { 1056 Diag(Member->getLocStart(), 1057 diag::override_keyword_only_allowed_on_virtual_member_functions) 1058 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1059 } else 1060 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1061 } 1062 if (VS.isFinalSpecified()) { 1063 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1064 if (!MD || !MD->isVirtual()) { 1065 Diag(Member->getLocStart(), 1066 diag::override_keyword_only_allowed_on_virtual_member_functions) 1067 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1068 } else 1069 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1070 } 1071 1072 if (VS.getLastLocation().isValid()) { 1073 // Update the end location of a method that has a virt-specifiers. 1074 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1075 MD->setRangeEnd(VS.getLastLocation()); 1076 } 1077 1078 CheckOverrideControl(Member); 1079 1080 assert((Name || isInstField) && "No identifier for non-field ?"); 1081 1082 if (Init) 1083 AddInitializerToDecl(Member, Init, false, 1084 DS.getTypeSpecType() == DeclSpec::TST_auto); 1085 if (Deleted) // FIXME: Source location is not very good. 1086 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1087 1088 FinalizeDeclaration(Member); 1089 1090 if (isInstField) 1091 FieldCollector->Add(cast<FieldDecl>(Member)); 1092 return Member; 1093} 1094 1095/// \brief Find the direct and/or virtual base specifiers that 1096/// correspond to the given base type, for use in base initialization 1097/// within a constructor. 1098static bool FindBaseInitializer(Sema &SemaRef, 1099 CXXRecordDecl *ClassDecl, 1100 QualType BaseType, 1101 const CXXBaseSpecifier *&DirectBaseSpec, 1102 const CXXBaseSpecifier *&VirtualBaseSpec) { 1103 // First, check for a direct base class. 1104 DirectBaseSpec = 0; 1105 for (CXXRecordDecl::base_class_const_iterator Base 1106 = ClassDecl->bases_begin(); 1107 Base != ClassDecl->bases_end(); ++Base) { 1108 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1109 // We found a direct base of this type. That's what we're 1110 // initializing. 1111 DirectBaseSpec = &*Base; 1112 break; 1113 } 1114 } 1115 1116 // Check for a virtual base class. 1117 // FIXME: We might be able to short-circuit this if we know in advance that 1118 // there are no virtual bases. 1119 VirtualBaseSpec = 0; 1120 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1121 // We haven't found a base yet; search the class hierarchy for a 1122 // virtual base class. 1123 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1124 /*DetectVirtual=*/false); 1125 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1126 BaseType, Paths)) { 1127 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1128 Path != Paths.end(); ++Path) { 1129 if (Path->back().Base->isVirtual()) { 1130 VirtualBaseSpec = Path->back().Base; 1131 break; 1132 } 1133 } 1134 } 1135 } 1136 1137 return DirectBaseSpec || VirtualBaseSpec; 1138} 1139 1140/// ActOnMemInitializer - Handle a C++ member initializer. 1141MemInitResult 1142Sema::ActOnMemInitializer(Decl *ConstructorD, 1143 Scope *S, 1144 CXXScopeSpec &SS, 1145 IdentifierInfo *MemberOrBase, 1146 ParsedType TemplateTypeTy, 1147 SourceLocation IdLoc, 1148 SourceLocation LParenLoc, 1149 ExprTy **Args, unsigned NumArgs, 1150 SourceLocation RParenLoc, 1151 SourceLocation EllipsisLoc) { 1152 if (!ConstructorD) 1153 return true; 1154 1155 AdjustDeclIfTemplate(ConstructorD); 1156 1157 CXXConstructorDecl *Constructor 1158 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1159 if (!Constructor) { 1160 // The user wrote a constructor initializer on a function that is 1161 // not a C++ constructor. Ignore the error for now, because we may 1162 // have more member initializers coming; we'll diagnose it just 1163 // once in ActOnMemInitializers. 1164 return true; 1165 } 1166 1167 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1168 1169 // C++ [class.base.init]p2: 1170 // Names in a mem-initializer-id are looked up in the scope of the 1171 // constructor's class and, if not found in that scope, are looked 1172 // up in the scope containing the constructor's definition. 1173 // [Note: if the constructor's class contains a member with the 1174 // same name as a direct or virtual base class of the class, a 1175 // mem-initializer-id naming the member or base class and composed 1176 // of a single identifier refers to the class member. A 1177 // mem-initializer-id for the hidden base class may be specified 1178 // using a qualified name. ] 1179 if (!SS.getScopeRep() && !TemplateTypeTy) { 1180 // Look for a member, first. 1181 FieldDecl *Member = 0; 1182 DeclContext::lookup_result Result 1183 = ClassDecl->lookup(MemberOrBase); 1184 if (Result.first != Result.second) { 1185 Member = dyn_cast<FieldDecl>(*Result.first); 1186 1187 if (Member) { 1188 if (EllipsisLoc.isValid()) 1189 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1190 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1191 1192 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1193 LParenLoc, RParenLoc); 1194 } 1195 1196 // Handle anonymous union case. 1197 if (IndirectFieldDecl* IndirectField 1198 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1199 if (EllipsisLoc.isValid()) 1200 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1201 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1202 1203 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1204 NumArgs, IdLoc, 1205 LParenLoc, RParenLoc); 1206 } 1207 } 1208 } 1209 // It didn't name a member, so see if it names a class. 1210 QualType BaseType; 1211 TypeSourceInfo *TInfo = 0; 1212 1213 if (TemplateTypeTy) { 1214 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1215 } else { 1216 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1217 LookupParsedName(R, S, &SS); 1218 1219 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1220 if (!TyD) { 1221 if (R.isAmbiguous()) return true; 1222 1223 // We don't want access-control diagnostics here. 1224 R.suppressDiagnostics(); 1225 1226 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1227 bool NotUnknownSpecialization = false; 1228 DeclContext *DC = computeDeclContext(SS, false); 1229 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1230 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1231 1232 if (!NotUnknownSpecialization) { 1233 // When the scope specifier can refer to a member of an unknown 1234 // specialization, we take it as a type name. 1235 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1236 SS.getWithLocInContext(Context), 1237 *MemberOrBase, IdLoc); 1238 if (BaseType.isNull()) 1239 return true; 1240 1241 R.clear(); 1242 R.setLookupName(MemberOrBase); 1243 } 1244 } 1245 1246 // If no results were found, try to correct typos. 1247 if (R.empty() && BaseType.isNull() && 1248 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1249 R.isSingleResult()) { 1250 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1251 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1252 // We have found a non-static data member with a similar 1253 // name to what was typed; complain and initialize that 1254 // member. 1255 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1256 << MemberOrBase << true << R.getLookupName() 1257 << FixItHint::CreateReplacement(R.getNameLoc(), 1258 R.getLookupName().getAsString()); 1259 Diag(Member->getLocation(), diag::note_previous_decl) 1260 << Member->getDeclName(); 1261 1262 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1263 LParenLoc, RParenLoc); 1264 } 1265 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1266 const CXXBaseSpecifier *DirectBaseSpec; 1267 const CXXBaseSpecifier *VirtualBaseSpec; 1268 if (FindBaseInitializer(*this, ClassDecl, 1269 Context.getTypeDeclType(Type), 1270 DirectBaseSpec, VirtualBaseSpec)) { 1271 // We have found a direct or virtual base class with a 1272 // similar name to what was typed; complain and initialize 1273 // that base class. 1274 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1275 << MemberOrBase << false << R.getLookupName() 1276 << FixItHint::CreateReplacement(R.getNameLoc(), 1277 R.getLookupName().getAsString()); 1278 1279 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1280 : VirtualBaseSpec; 1281 Diag(BaseSpec->getSourceRange().getBegin(), 1282 diag::note_base_class_specified_here) 1283 << BaseSpec->getType() 1284 << BaseSpec->getSourceRange(); 1285 1286 TyD = Type; 1287 } 1288 } 1289 } 1290 1291 if (!TyD && BaseType.isNull()) { 1292 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1293 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1294 return true; 1295 } 1296 } 1297 1298 if (BaseType.isNull()) { 1299 BaseType = Context.getTypeDeclType(TyD); 1300 if (SS.isSet()) { 1301 NestedNameSpecifier *Qualifier = 1302 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1303 1304 // FIXME: preserve source range information 1305 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1306 } 1307 } 1308 } 1309 1310 if (!TInfo) 1311 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1312 1313 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1314 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1315} 1316 1317/// Checks an initializer expression for use of uninitialized fields, such as 1318/// containing the field that is being initialized. Returns true if there is an 1319/// uninitialized field was used an updates the SourceLocation parameter; false 1320/// otherwise. 1321static bool InitExprContainsUninitializedFields(const Stmt *S, 1322 const ValueDecl *LhsField, 1323 SourceLocation *L) { 1324 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1325 1326 if (isa<CallExpr>(S)) { 1327 // Do not descend into function calls or constructors, as the use 1328 // of an uninitialized field may be valid. One would have to inspect 1329 // the contents of the function/ctor to determine if it is safe or not. 1330 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1331 // may be safe, depending on what the function/ctor does. 1332 return false; 1333 } 1334 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1335 const NamedDecl *RhsField = ME->getMemberDecl(); 1336 1337 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1338 // The member expression points to a static data member. 1339 assert(VD->isStaticDataMember() && 1340 "Member points to non-static data member!"); 1341 (void)VD; 1342 return false; 1343 } 1344 1345 if (isa<EnumConstantDecl>(RhsField)) { 1346 // The member expression points to an enum. 1347 return false; 1348 } 1349 1350 if (RhsField == LhsField) { 1351 // Initializing a field with itself. Throw a warning. 1352 // But wait; there are exceptions! 1353 // Exception #1: The field may not belong to this record. 1354 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1355 const Expr *base = ME->getBase(); 1356 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1357 // Even though the field matches, it does not belong to this record. 1358 return false; 1359 } 1360 // None of the exceptions triggered; return true to indicate an 1361 // uninitialized field was used. 1362 *L = ME->getMemberLoc(); 1363 return true; 1364 } 1365 } else if (isa<SizeOfAlignOfExpr>(S)) { 1366 // sizeof/alignof doesn't reference contents, do not warn. 1367 return false; 1368 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1369 // address-of doesn't reference contents (the pointer may be dereferenced 1370 // in the same expression but it would be rare; and weird). 1371 if (UOE->getOpcode() == UO_AddrOf) 1372 return false; 1373 } 1374 for (Stmt::const_child_range it = S->children(); it; ++it) { 1375 if (!*it) { 1376 // An expression such as 'member(arg ?: "")' may trigger this. 1377 continue; 1378 } 1379 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1380 return true; 1381 } 1382 return false; 1383} 1384 1385MemInitResult 1386Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1387 unsigned NumArgs, SourceLocation IdLoc, 1388 SourceLocation LParenLoc, 1389 SourceLocation RParenLoc) { 1390 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1391 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1392 assert((DirectMember || IndirectMember) && 1393 "Member must be a FieldDecl or IndirectFieldDecl"); 1394 1395 if (Member->isInvalidDecl()) 1396 return true; 1397 1398 // Diagnose value-uses of fields to initialize themselves, e.g. 1399 // foo(foo) 1400 // where foo is not also a parameter to the constructor. 1401 // TODO: implement -Wuninitialized and fold this into that framework. 1402 for (unsigned i = 0; i < NumArgs; ++i) { 1403 SourceLocation L; 1404 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1405 // FIXME: Return true in the case when other fields are used before being 1406 // uninitialized. For example, let this field be the i'th field. When 1407 // initializing the i'th field, throw a warning if any of the >= i'th 1408 // fields are used, as they are not yet initialized. 1409 // Right now we are only handling the case where the i'th field uses 1410 // itself in its initializer. 1411 Diag(L, diag::warn_field_is_uninit); 1412 } 1413 } 1414 1415 bool HasDependentArg = false; 1416 for (unsigned i = 0; i < NumArgs; i++) 1417 HasDependentArg |= Args[i]->isTypeDependent(); 1418 1419 Expr *Init; 1420 if (Member->getType()->isDependentType() || HasDependentArg) { 1421 // Can't check initialization for a member of dependent type or when 1422 // any of the arguments are type-dependent expressions. 1423 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1424 RParenLoc); 1425 1426 // Erase any temporaries within this evaluation context; we're not 1427 // going to track them in the AST, since we'll be rebuilding the 1428 // ASTs during template instantiation. 1429 ExprTemporaries.erase( 1430 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1431 ExprTemporaries.end()); 1432 } else { 1433 // Initialize the member. 1434 InitializedEntity MemberEntity = 1435 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1436 : InitializedEntity::InitializeMember(IndirectMember, 0); 1437 InitializationKind Kind = 1438 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1439 1440 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1441 1442 ExprResult MemberInit = 1443 InitSeq.Perform(*this, MemberEntity, Kind, 1444 MultiExprArg(*this, Args, NumArgs), 0); 1445 if (MemberInit.isInvalid()) 1446 return true; 1447 1448 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1449 1450 // C++0x [class.base.init]p7: 1451 // The initialization of each base and member constitutes a 1452 // full-expression. 1453 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1454 if (MemberInit.isInvalid()) 1455 return true; 1456 1457 // If we are in a dependent context, template instantiation will 1458 // perform this type-checking again. Just save the arguments that we 1459 // received in a ParenListExpr. 1460 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1461 // of the information that we have about the member 1462 // initializer. However, deconstructing the ASTs is a dicey process, 1463 // and this approach is far more likely to get the corner cases right. 1464 if (CurContext->isDependentContext()) 1465 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1466 RParenLoc); 1467 else 1468 Init = MemberInit.get(); 1469 } 1470 1471 if (DirectMember) { 1472 return new (Context) CXXCtorInitializer(Context, DirectMember, 1473 IdLoc, LParenLoc, Init, 1474 RParenLoc); 1475 } else { 1476 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1477 IdLoc, LParenLoc, Init, 1478 RParenLoc); 1479 } 1480} 1481 1482MemInitResult 1483Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1484 Expr **Args, unsigned NumArgs, 1485 SourceLocation NameLoc, 1486 SourceLocation LParenLoc, 1487 SourceLocation RParenLoc, 1488 CXXRecordDecl *ClassDecl) { 1489 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1490 if (!LangOpts.CPlusPlus0x) 1491 return Diag(Loc, diag::err_delegation_0x_only) 1492 << TInfo->getTypeLoc().getLocalSourceRange(); 1493 1494 // Initialize the object. 1495 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1496 QualType(ClassDecl->getTypeForDecl(), 0)); 1497 InitializationKind Kind = 1498 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1499 1500 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1501 1502 ExprResult DelegationInit = 1503 InitSeq.Perform(*this, DelegationEntity, Kind, 1504 MultiExprArg(*this, Args, NumArgs), 0); 1505 if (DelegationInit.isInvalid()) 1506 return true; 1507 1508 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1509 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1510 assert(Constructor && "Delegating constructor with no target?"); 1511 1512 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1513 1514 // C++0x [class.base.init]p7: 1515 // The initialization of each base and member constitutes a 1516 // full-expression. 1517 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1518 if (DelegationInit.isInvalid()) 1519 return true; 1520 1521 // If we are in a dependent context, template instantiation will 1522 // perform this type-checking again. Just save the arguments that we 1523 // received in a ParenListExpr. 1524 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1525 // of the information that we have about the base 1526 // initializer. However, deconstructing the ASTs is a dicey process, 1527 // and this approach is far more likely to get the corner cases right. 1528 if (CurContext->isDependentContext()) { 1529 ExprResult Init 1530 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1531 NumArgs, RParenLoc)); 1532 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1533 Constructor, Init.takeAs<Expr>(), 1534 RParenLoc); 1535 } 1536 1537 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1538 DelegationInit.takeAs<Expr>(), 1539 RParenLoc); 1540} 1541 1542MemInitResult 1543Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1544 Expr **Args, unsigned NumArgs, 1545 SourceLocation LParenLoc, SourceLocation RParenLoc, 1546 CXXRecordDecl *ClassDecl, 1547 SourceLocation EllipsisLoc) { 1548 bool HasDependentArg = false; 1549 for (unsigned i = 0; i < NumArgs; i++) 1550 HasDependentArg |= Args[i]->isTypeDependent(); 1551 1552 SourceLocation BaseLoc 1553 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1554 1555 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1556 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1557 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1558 1559 // C++ [class.base.init]p2: 1560 // [...] Unless the mem-initializer-id names a nonstatic data 1561 // member of the constructor's class or a direct or virtual base 1562 // of that class, the mem-initializer is ill-formed. A 1563 // mem-initializer-list can initialize a base class using any 1564 // name that denotes that base class type. 1565 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1566 1567 if (EllipsisLoc.isValid()) { 1568 // This is a pack expansion. 1569 if (!BaseType->containsUnexpandedParameterPack()) { 1570 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1571 << SourceRange(BaseLoc, RParenLoc); 1572 1573 EllipsisLoc = SourceLocation(); 1574 } 1575 } else { 1576 // Check for any unexpanded parameter packs. 1577 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1578 return true; 1579 1580 for (unsigned I = 0; I != NumArgs; ++I) 1581 if (DiagnoseUnexpandedParameterPack(Args[I])) 1582 return true; 1583 } 1584 1585 // Check for direct and virtual base classes. 1586 const CXXBaseSpecifier *DirectBaseSpec = 0; 1587 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1588 if (!Dependent) { 1589 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1590 BaseType)) 1591 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1592 LParenLoc, RParenLoc, ClassDecl); 1593 1594 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1595 VirtualBaseSpec); 1596 1597 // C++ [base.class.init]p2: 1598 // Unless the mem-initializer-id names a nonstatic data member of the 1599 // constructor's class or a direct or virtual base of that class, the 1600 // mem-initializer is ill-formed. 1601 if (!DirectBaseSpec && !VirtualBaseSpec) { 1602 // If the class has any dependent bases, then it's possible that 1603 // one of those types will resolve to the same type as 1604 // BaseType. Therefore, just treat this as a dependent base 1605 // class initialization. FIXME: Should we try to check the 1606 // initialization anyway? It seems odd. 1607 if (ClassDecl->hasAnyDependentBases()) 1608 Dependent = true; 1609 else 1610 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1611 << BaseType << Context.getTypeDeclType(ClassDecl) 1612 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1613 } 1614 } 1615 1616 if (Dependent) { 1617 // Can't check initialization for a base of dependent type or when 1618 // any of the arguments are type-dependent expressions. 1619 ExprResult BaseInit 1620 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1621 RParenLoc)); 1622 1623 // Erase any temporaries within this evaluation context; we're not 1624 // going to track them in the AST, since we'll be rebuilding the 1625 // ASTs during template instantiation. 1626 ExprTemporaries.erase( 1627 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1628 ExprTemporaries.end()); 1629 1630 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1631 /*IsVirtual=*/false, 1632 LParenLoc, 1633 BaseInit.takeAs<Expr>(), 1634 RParenLoc, 1635 EllipsisLoc); 1636 } 1637 1638 // C++ [base.class.init]p2: 1639 // If a mem-initializer-id is ambiguous because it designates both 1640 // a direct non-virtual base class and an inherited virtual base 1641 // class, the mem-initializer is ill-formed. 1642 if (DirectBaseSpec && VirtualBaseSpec) 1643 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1644 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1645 1646 CXXBaseSpecifier *BaseSpec 1647 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1648 if (!BaseSpec) 1649 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1650 1651 // Initialize the base. 1652 InitializedEntity BaseEntity = 1653 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1654 InitializationKind Kind = 1655 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1656 1657 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1658 1659 ExprResult BaseInit = 1660 InitSeq.Perform(*this, BaseEntity, Kind, 1661 MultiExprArg(*this, Args, NumArgs), 0); 1662 if (BaseInit.isInvalid()) 1663 return true; 1664 1665 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1666 1667 // C++0x [class.base.init]p7: 1668 // The initialization of each base and member constitutes a 1669 // full-expression. 1670 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1671 if (BaseInit.isInvalid()) 1672 return true; 1673 1674 // If we are in a dependent context, template instantiation will 1675 // perform this type-checking again. Just save the arguments that we 1676 // received in a ParenListExpr. 1677 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1678 // of the information that we have about the base 1679 // initializer. However, deconstructing the ASTs is a dicey process, 1680 // and this approach is far more likely to get the corner cases right. 1681 if (CurContext->isDependentContext()) { 1682 ExprResult Init 1683 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1684 RParenLoc)); 1685 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1686 BaseSpec->isVirtual(), 1687 LParenLoc, 1688 Init.takeAs<Expr>(), 1689 RParenLoc, 1690 EllipsisLoc); 1691 } 1692 1693 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1694 BaseSpec->isVirtual(), 1695 LParenLoc, 1696 BaseInit.takeAs<Expr>(), 1697 RParenLoc, 1698 EllipsisLoc); 1699} 1700 1701/// ImplicitInitializerKind - How an implicit base or member initializer should 1702/// initialize its base or member. 1703enum ImplicitInitializerKind { 1704 IIK_Default, 1705 IIK_Copy, 1706 IIK_Move 1707}; 1708 1709static bool 1710BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1711 ImplicitInitializerKind ImplicitInitKind, 1712 CXXBaseSpecifier *BaseSpec, 1713 bool IsInheritedVirtualBase, 1714 CXXCtorInitializer *&CXXBaseInit) { 1715 InitializedEntity InitEntity 1716 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1717 IsInheritedVirtualBase); 1718 1719 ExprResult BaseInit; 1720 1721 switch (ImplicitInitKind) { 1722 case IIK_Default: { 1723 InitializationKind InitKind 1724 = InitializationKind::CreateDefault(Constructor->getLocation()); 1725 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1726 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1727 MultiExprArg(SemaRef, 0, 0)); 1728 break; 1729 } 1730 1731 case IIK_Copy: { 1732 ParmVarDecl *Param = Constructor->getParamDecl(0); 1733 QualType ParamType = Param->getType().getNonReferenceType(); 1734 1735 Expr *CopyCtorArg = 1736 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1737 Constructor->getLocation(), ParamType, 1738 VK_LValue, 0); 1739 1740 // Cast to the base class to avoid ambiguities. 1741 QualType ArgTy = 1742 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1743 ParamType.getQualifiers()); 1744 1745 CXXCastPath BasePath; 1746 BasePath.push_back(BaseSpec); 1747 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1748 CK_UncheckedDerivedToBase, 1749 VK_LValue, &BasePath); 1750 1751 InitializationKind InitKind 1752 = InitializationKind::CreateDirect(Constructor->getLocation(), 1753 SourceLocation(), SourceLocation()); 1754 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1755 &CopyCtorArg, 1); 1756 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1757 MultiExprArg(&CopyCtorArg, 1)); 1758 break; 1759 } 1760 1761 case IIK_Move: 1762 assert(false && "Unhandled initializer kind!"); 1763 } 1764 1765 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1766 if (BaseInit.isInvalid()) 1767 return true; 1768 1769 CXXBaseInit = 1770 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1771 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1772 SourceLocation()), 1773 BaseSpec->isVirtual(), 1774 SourceLocation(), 1775 BaseInit.takeAs<Expr>(), 1776 SourceLocation(), 1777 SourceLocation()); 1778 1779 return false; 1780} 1781 1782static bool 1783BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1784 ImplicitInitializerKind ImplicitInitKind, 1785 FieldDecl *Field, 1786 CXXCtorInitializer *&CXXMemberInit) { 1787 if (Field->isInvalidDecl()) 1788 return true; 1789 1790 SourceLocation Loc = Constructor->getLocation(); 1791 1792 if (ImplicitInitKind == IIK_Copy) { 1793 ParmVarDecl *Param = Constructor->getParamDecl(0); 1794 QualType ParamType = Param->getType().getNonReferenceType(); 1795 1796 Expr *MemberExprBase = 1797 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1798 Loc, ParamType, VK_LValue, 0); 1799 1800 // Build a reference to this field within the parameter. 1801 CXXScopeSpec SS; 1802 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1803 Sema::LookupMemberName); 1804 MemberLookup.addDecl(Field, AS_public); 1805 MemberLookup.resolveKind(); 1806 ExprResult CopyCtorArg 1807 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1808 ParamType, Loc, 1809 /*IsArrow=*/false, 1810 SS, 1811 /*FirstQualifierInScope=*/0, 1812 MemberLookup, 1813 /*TemplateArgs=*/0); 1814 if (CopyCtorArg.isInvalid()) 1815 return true; 1816 1817 // When the field we are copying is an array, create index variables for 1818 // each dimension of the array. We use these index variables to subscript 1819 // the source array, and other clients (e.g., CodeGen) will perform the 1820 // necessary iteration with these index variables. 1821 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1822 QualType BaseType = Field->getType(); 1823 QualType SizeType = SemaRef.Context.getSizeType(); 1824 while (const ConstantArrayType *Array 1825 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1826 // Create the iteration variable for this array index. 1827 IdentifierInfo *IterationVarName = 0; 1828 { 1829 llvm::SmallString<8> Str; 1830 llvm::raw_svector_ostream OS(Str); 1831 OS << "__i" << IndexVariables.size(); 1832 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1833 } 1834 VarDecl *IterationVar 1835 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1836 IterationVarName, SizeType, 1837 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1838 SC_None, SC_None); 1839 IndexVariables.push_back(IterationVar); 1840 1841 // Create a reference to the iteration variable. 1842 ExprResult IterationVarRef 1843 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1844 assert(!IterationVarRef.isInvalid() && 1845 "Reference to invented variable cannot fail!"); 1846 1847 // Subscript the array with this iteration variable. 1848 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1849 Loc, 1850 IterationVarRef.take(), 1851 Loc); 1852 if (CopyCtorArg.isInvalid()) 1853 return true; 1854 1855 BaseType = Array->getElementType(); 1856 } 1857 1858 // Construct the entity that we will be initializing. For an array, this 1859 // will be first element in the array, which may require several levels 1860 // of array-subscript entities. 1861 llvm::SmallVector<InitializedEntity, 4> Entities; 1862 Entities.reserve(1 + IndexVariables.size()); 1863 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1864 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1865 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1866 0, 1867 Entities.back())); 1868 1869 // Direct-initialize to use the copy constructor. 1870 InitializationKind InitKind = 1871 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1872 1873 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1874 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1875 &CopyCtorArgE, 1); 1876 1877 ExprResult MemberInit 1878 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1879 MultiExprArg(&CopyCtorArgE, 1)); 1880 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1881 if (MemberInit.isInvalid()) 1882 return true; 1883 1884 CXXMemberInit 1885 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1886 MemberInit.takeAs<Expr>(), Loc, 1887 IndexVariables.data(), 1888 IndexVariables.size()); 1889 return false; 1890 } 1891 1892 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1893 1894 QualType FieldBaseElementType = 1895 SemaRef.Context.getBaseElementType(Field->getType()); 1896 1897 if (FieldBaseElementType->isRecordType()) { 1898 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1899 InitializationKind InitKind = 1900 InitializationKind::CreateDefault(Loc); 1901 1902 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1903 ExprResult MemberInit = 1904 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1905 1906 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1907 if (MemberInit.isInvalid()) 1908 return true; 1909 1910 CXXMemberInit = 1911 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1912 Field, Loc, Loc, 1913 MemberInit.get(), 1914 Loc); 1915 return false; 1916 } 1917 1918 if (FieldBaseElementType->isReferenceType()) { 1919 SemaRef.Diag(Constructor->getLocation(), 1920 diag::err_uninitialized_member_in_ctor) 1921 << (int)Constructor->isImplicit() 1922 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1923 << 0 << Field->getDeclName(); 1924 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1925 return true; 1926 } 1927 1928 if (FieldBaseElementType.isConstQualified()) { 1929 SemaRef.Diag(Constructor->getLocation(), 1930 diag::err_uninitialized_member_in_ctor) 1931 << (int)Constructor->isImplicit() 1932 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1933 << 1 << Field->getDeclName(); 1934 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1935 return true; 1936 } 1937 1938 // Nothing to initialize. 1939 CXXMemberInit = 0; 1940 return false; 1941} 1942 1943namespace { 1944struct BaseAndFieldInfo { 1945 Sema &S; 1946 CXXConstructorDecl *Ctor; 1947 bool AnyErrorsInInits; 1948 ImplicitInitializerKind IIK; 1949 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1950 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1951 1952 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1953 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1954 // FIXME: Handle implicit move constructors. 1955 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1956 IIK = IIK_Copy; 1957 else 1958 IIK = IIK_Default; 1959 } 1960}; 1961} 1962 1963static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1964 FieldDecl *Top, FieldDecl *Field) { 1965 1966 // Overwhelmingly common case: we have a direct initializer for this field. 1967 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1968 Info.AllToInit.push_back(Init); 1969 return false; 1970 } 1971 1972 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1973 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1974 assert(FieldClassType && "anonymous struct/union without record type"); 1975 CXXRecordDecl *FieldClassDecl 1976 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1977 1978 // Even though union members never have non-trivial default 1979 // constructions in C++03, we still build member initializers for aggregate 1980 // record types which can be union members, and C++0x allows non-trivial 1981 // default constructors for union members, so we ensure that only one 1982 // member is initialized for these. 1983 if (FieldClassDecl->isUnion()) { 1984 // First check for an explicit initializer for one field. 1985 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1986 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1987 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1988 Info.AllToInit.push_back(Init); 1989 1990 // Once we've initialized a field of an anonymous union, the union 1991 // field in the class is also initialized, so exit immediately. 1992 return false; 1993 } else if ((*FA)->isAnonymousStructOrUnion()) { 1994 if (CollectFieldInitializer(Info, Top, *FA)) 1995 return true; 1996 } 1997 } 1998 1999 // Fallthrough and construct a default initializer for the union as 2000 // a whole, which can call its default constructor if such a thing exists 2001 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2002 // behavior going forward with C++0x, when anonymous unions there are 2003 // finalized, we should revisit this. 2004 } else { 2005 // For structs, we simply descend through to initialize all members where 2006 // necessary. 2007 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2008 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2009 if (CollectFieldInitializer(Info, Top, *FA)) 2010 return true; 2011 } 2012 } 2013 } 2014 2015 // Don't try to build an implicit initializer if there were semantic 2016 // errors in any of the initializers (and therefore we might be 2017 // missing some that the user actually wrote). 2018 if (Info.AnyErrorsInInits) 2019 return false; 2020 2021 CXXCtorInitializer *Init = 0; 2022 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2023 return true; 2024 2025 if (Init) 2026 Info.AllToInit.push_back(Init); 2027 2028 return false; 2029} 2030 2031bool 2032Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2033 CXXCtorInitializer **Initializers, 2034 unsigned NumInitializers, 2035 bool AnyErrors) { 2036 if (Constructor->getDeclContext()->isDependentContext()) { 2037 // Just store the initializers as written, they will be checked during 2038 // instantiation. 2039 if (NumInitializers > 0) { 2040 Constructor->setNumCtorInitializers(NumInitializers); 2041 CXXCtorInitializer **baseOrMemberInitializers = 2042 new (Context) CXXCtorInitializer*[NumInitializers]; 2043 memcpy(baseOrMemberInitializers, Initializers, 2044 NumInitializers * sizeof(CXXCtorInitializer*)); 2045 Constructor->setCtorInitializers(baseOrMemberInitializers); 2046 } 2047 2048 return false; 2049 } 2050 2051 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2052 2053 // We need to build the initializer AST according to order of construction 2054 // and not what user specified in the Initializers list. 2055 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2056 if (!ClassDecl) 2057 return true; 2058 2059 bool HadError = false; 2060 2061 for (unsigned i = 0; i < NumInitializers; i++) { 2062 CXXCtorInitializer *Member = Initializers[i]; 2063 2064 if (Member->isBaseInitializer()) 2065 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2066 else 2067 Info.AllBaseFields[Member->getAnyMember()] = Member; 2068 } 2069 2070 // Keep track of the direct virtual bases. 2071 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2072 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2073 E = ClassDecl->bases_end(); I != E; ++I) { 2074 if (I->isVirtual()) 2075 DirectVBases.insert(I); 2076 } 2077 2078 // Push virtual bases before others. 2079 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2080 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2081 2082 if (CXXCtorInitializer *Value 2083 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2084 Info.AllToInit.push_back(Value); 2085 } else if (!AnyErrors) { 2086 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2087 CXXCtorInitializer *CXXBaseInit; 2088 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2089 VBase, IsInheritedVirtualBase, 2090 CXXBaseInit)) { 2091 HadError = true; 2092 continue; 2093 } 2094 2095 Info.AllToInit.push_back(CXXBaseInit); 2096 } 2097 } 2098 2099 // Non-virtual bases. 2100 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2101 E = ClassDecl->bases_end(); Base != E; ++Base) { 2102 // Virtuals are in the virtual base list and already constructed. 2103 if (Base->isVirtual()) 2104 continue; 2105 2106 if (CXXCtorInitializer *Value 2107 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2108 Info.AllToInit.push_back(Value); 2109 } else if (!AnyErrors) { 2110 CXXCtorInitializer *CXXBaseInit; 2111 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2112 Base, /*IsInheritedVirtualBase=*/false, 2113 CXXBaseInit)) { 2114 HadError = true; 2115 continue; 2116 } 2117 2118 Info.AllToInit.push_back(CXXBaseInit); 2119 } 2120 } 2121 2122 // Fields. 2123 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2124 E = ClassDecl->field_end(); Field != E; ++Field) { 2125 if ((*Field)->getType()->isIncompleteArrayType()) { 2126 assert(ClassDecl->hasFlexibleArrayMember() && 2127 "Incomplete array type is not valid"); 2128 continue; 2129 } 2130 if (CollectFieldInitializer(Info, *Field, *Field)) 2131 HadError = true; 2132 } 2133 2134 NumInitializers = Info.AllToInit.size(); 2135 if (NumInitializers > 0) { 2136 Constructor->setNumCtorInitializers(NumInitializers); 2137 CXXCtorInitializer **baseOrMemberInitializers = 2138 new (Context) CXXCtorInitializer*[NumInitializers]; 2139 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2140 NumInitializers * sizeof(CXXCtorInitializer*)); 2141 Constructor->setCtorInitializers(baseOrMemberInitializers); 2142 2143 // Constructors implicitly reference the base and member 2144 // destructors. 2145 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2146 Constructor->getParent()); 2147 } 2148 2149 return HadError; 2150} 2151 2152static void *GetKeyForTopLevelField(FieldDecl *Field) { 2153 // For anonymous unions, use the class declaration as the key. 2154 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2155 if (RT->getDecl()->isAnonymousStructOrUnion()) 2156 return static_cast<void *>(RT->getDecl()); 2157 } 2158 return static_cast<void *>(Field); 2159} 2160 2161static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2162 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2163} 2164 2165static void *GetKeyForMember(ASTContext &Context, 2166 CXXCtorInitializer *Member) { 2167 if (!Member->isAnyMemberInitializer()) 2168 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2169 2170 // For fields injected into the class via declaration of an anonymous union, 2171 // use its anonymous union class declaration as the unique key. 2172 FieldDecl *Field = Member->getAnyMember(); 2173 2174 // If the field is a member of an anonymous struct or union, our key 2175 // is the anonymous record decl that's a direct child of the class. 2176 RecordDecl *RD = Field->getParent(); 2177 if (RD->isAnonymousStructOrUnion()) { 2178 while (true) { 2179 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2180 if (Parent->isAnonymousStructOrUnion()) 2181 RD = Parent; 2182 else 2183 break; 2184 } 2185 2186 return static_cast<void *>(RD); 2187 } 2188 2189 return static_cast<void *>(Field); 2190} 2191 2192static void 2193DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2194 const CXXConstructorDecl *Constructor, 2195 CXXCtorInitializer **Inits, 2196 unsigned NumInits) { 2197 if (Constructor->getDeclContext()->isDependentContext()) 2198 return; 2199 2200 // Don't check initializers order unless the warning is enabled at the 2201 // location of at least one initializer. 2202 bool ShouldCheckOrder = false; 2203 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2204 CXXCtorInitializer *Init = Inits[InitIndex]; 2205 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2206 Init->getSourceLocation()) 2207 != Diagnostic::Ignored) { 2208 ShouldCheckOrder = true; 2209 break; 2210 } 2211 } 2212 if (!ShouldCheckOrder) 2213 return; 2214 2215 // Build the list of bases and members in the order that they'll 2216 // actually be initialized. The explicit initializers should be in 2217 // this same order but may be missing things. 2218 llvm::SmallVector<const void*, 32> IdealInitKeys; 2219 2220 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2221 2222 // 1. Virtual bases. 2223 for (CXXRecordDecl::base_class_const_iterator VBase = 2224 ClassDecl->vbases_begin(), 2225 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2226 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2227 2228 // 2. Non-virtual bases. 2229 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2230 E = ClassDecl->bases_end(); Base != E; ++Base) { 2231 if (Base->isVirtual()) 2232 continue; 2233 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2234 } 2235 2236 // 3. Direct fields. 2237 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2238 E = ClassDecl->field_end(); Field != E; ++Field) 2239 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2240 2241 unsigned NumIdealInits = IdealInitKeys.size(); 2242 unsigned IdealIndex = 0; 2243 2244 CXXCtorInitializer *PrevInit = 0; 2245 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2246 CXXCtorInitializer *Init = Inits[InitIndex]; 2247 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2248 2249 // Scan forward to try to find this initializer in the idealized 2250 // initializers list. 2251 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2252 if (InitKey == IdealInitKeys[IdealIndex]) 2253 break; 2254 2255 // If we didn't find this initializer, it must be because we 2256 // scanned past it on a previous iteration. That can only 2257 // happen if we're out of order; emit a warning. 2258 if (IdealIndex == NumIdealInits && PrevInit) { 2259 Sema::SemaDiagnosticBuilder D = 2260 SemaRef.Diag(PrevInit->getSourceLocation(), 2261 diag::warn_initializer_out_of_order); 2262 2263 if (PrevInit->isAnyMemberInitializer()) 2264 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2265 else 2266 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2267 2268 if (Init->isAnyMemberInitializer()) 2269 D << 0 << Init->getAnyMember()->getDeclName(); 2270 else 2271 D << 1 << Init->getBaseClassInfo()->getType(); 2272 2273 // Move back to the initializer's location in the ideal list. 2274 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2275 if (InitKey == IdealInitKeys[IdealIndex]) 2276 break; 2277 2278 assert(IdealIndex != NumIdealInits && 2279 "initializer not found in initializer list"); 2280 } 2281 2282 PrevInit = Init; 2283 } 2284} 2285 2286namespace { 2287bool CheckRedundantInit(Sema &S, 2288 CXXCtorInitializer *Init, 2289 CXXCtorInitializer *&PrevInit) { 2290 if (!PrevInit) { 2291 PrevInit = Init; 2292 return false; 2293 } 2294 2295 if (FieldDecl *Field = Init->getMember()) 2296 S.Diag(Init->getSourceLocation(), 2297 diag::err_multiple_mem_initialization) 2298 << Field->getDeclName() 2299 << Init->getSourceRange(); 2300 else { 2301 const Type *BaseClass = Init->getBaseClass(); 2302 assert(BaseClass && "neither field nor base"); 2303 S.Diag(Init->getSourceLocation(), 2304 diag::err_multiple_base_initialization) 2305 << QualType(BaseClass, 0) 2306 << Init->getSourceRange(); 2307 } 2308 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2309 << 0 << PrevInit->getSourceRange(); 2310 2311 return true; 2312} 2313 2314typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2315typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2316 2317bool CheckRedundantUnionInit(Sema &S, 2318 CXXCtorInitializer *Init, 2319 RedundantUnionMap &Unions) { 2320 FieldDecl *Field = Init->getAnyMember(); 2321 RecordDecl *Parent = Field->getParent(); 2322 if (!Parent->isAnonymousStructOrUnion()) 2323 return false; 2324 2325 NamedDecl *Child = Field; 2326 do { 2327 if (Parent->isUnion()) { 2328 UnionEntry &En = Unions[Parent]; 2329 if (En.first && En.first != Child) { 2330 S.Diag(Init->getSourceLocation(), 2331 diag::err_multiple_mem_union_initialization) 2332 << Field->getDeclName() 2333 << Init->getSourceRange(); 2334 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2335 << 0 << En.second->getSourceRange(); 2336 return true; 2337 } else if (!En.first) { 2338 En.first = Child; 2339 En.second = Init; 2340 } 2341 } 2342 2343 Child = Parent; 2344 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2345 } while (Parent->isAnonymousStructOrUnion()); 2346 2347 return false; 2348} 2349} 2350 2351/// ActOnMemInitializers - Handle the member initializers for a constructor. 2352void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2353 SourceLocation ColonLoc, 2354 MemInitTy **meminits, unsigned NumMemInits, 2355 bool AnyErrors) { 2356 if (!ConstructorDecl) 2357 return; 2358 2359 AdjustDeclIfTemplate(ConstructorDecl); 2360 2361 CXXConstructorDecl *Constructor 2362 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2363 2364 if (!Constructor) { 2365 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2366 return; 2367 } 2368 2369 CXXCtorInitializer **MemInits = 2370 reinterpret_cast<CXXCtorInitializer **>(meminits); 2371 2372 // Mapping for the duplicate initializers check. 2373 // For member initializers, this is keyed with a FieldDecl*. 2374 // For base initializers, this is keyed with a Type*. 2375 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2376 2377 // Mapping for the inconsistent anonymous-union initializers check. 2378 RedundantUnionMap MemberUnions; 2379 2380 bool HadError = false; 2381 for (unsigned i = 0; i < NumMemInits; i++) { 2382 CXXCtorInitializer *Init = MemInits[i]; 2383 2384 // Set the source order index. 2385 Init->setSourceOrder(i); 2386 2387 if (Init->isAnyMemberInitializer()) { 2388 FieldDecl *Field = Init->getAnyMember(); 2389 if (CheckRedundantInit(*this, Init, Members[Field]) || 2390 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2391 HadError = true; 2392 } else if (Init->isBaseInitializer()) { 2393 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2394 if (CheckRedundantInit(*this, Init, Members[Key])) 2395 HadError = true; 2396 } else { 2397 assert(Init->isDelegatingInitializer()); 2398 // This must be the only initializer 2399 if (i != 0 || NumMemInits > 1) { 2400 Diag(MemInits[0]->getSourceLocation(), 2401 diag::err_delegating_initializer_alone) 2402 << MemInits[0]->getSourceRange(); 2403 HadError = true; 2404 } 2405 } 2406 } 2407 2408 if (HadError) 2409 return; 2410 2411 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2412 2413 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2414} 2415 2416void 2417Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2418 CXXRecordDecl *ClassDecl) { 2419 // Ignore dependent contexts. 2420 if (ClassDecl->isDependentContext()) 2421 return; 2422 2423 // FIXME: all the access-control diagnostics are positioned on the 2424 // field/base declaration. That's probably good; that said, the 2425 // user might reasonably want to know why the destructor is being 2426 // emitted, and we currently don't say. 2427 2428 // Non-static data members. 2429 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2430 E = ClassDecl->field_end(); I != E; ++I) { 2431 FieldDecl *Field = *I; 2432 if (Field->isInvalidDecl()) 2433 continue; 2434 QualType FieldType = Context.getBaseElementType(Field->getType()); 2435 2436 const RecordType* RT = FieldType->getAs<RecordType>(); 2437 if (!RT) 2438 continue; 2439 2440 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2441 if (FieldClassDecl->hasTrivialDestructor()) 2442 continue; 2443 2444 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2445 CheckDestructorAccess(Field->getLocation(), Dtor, 2446 PDiag(diag::err_access_dtor_field) 2447 << Field->getDeclName() 2448 << FieldType); 2449 2450 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2451 } 2452 2453 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2454 2455 // Bases. 2456 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2457 E = ClassDecl->bases_end(); Base != E; ++Base) { 2458 // Bases are always records in a well-formed non-dependent class. 2459 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2460 2461 // Remember direct virtual bases. 2462 if (Base->isVirtual()) 2463 DirectVirtualBases.insert(RT); 2464 2465 // Ignore trivial destructors. 2466 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2467 if (BaseClassDecl->hasTrivialDestructor()) 2468 continue; 2469 2470 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2471 2472 // FIXME: caret should be on the start of the class name 2473 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2474 PDiag(diag::err_access_dtor_base) 2475 << Base->getType() 2476 << Base->getSourceRange()); 2477 2478 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2479 } 2480 2481 // Virtual bases. 2482 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2483 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2484 2485 // Bases are always records in a well-formed non-dependent class. 2486 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2487 2488 // Ignore direct virtual bases. 2489 if (DirectVirtualBases.count(RT)) 2490 continue; 2491 2492 // Ignore trivial destructors. 2493 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2494 if (BaseClassDecl->hasTrivialDestructor()) 2495 continue; 2496 2497 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2498 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2499 PDiag(diag::err_access_dtor_vbase) 2500 << VBase->getType()); 2501 2502 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2503 } 2504} 2505 2506void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2507 if (!CDtorDecl) 2508 return; 2509 2510 if (CXXConstructorDecl *Constructor 2511 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2512 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2513} 2514 2515bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2516 unsigned DiagID, AbstractDiagSelID SelID) { 2517 if (SelID == -1) 2518 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2519 else 2520 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2521} 2522 2523bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2524 const PartialDiagnostic &PD) { 2525 if (!getLangOptions().CPlusPlus) 2526 return false; 2527 2528 if (const ArrayType *AT = Context.getAsArrayType(T)) 2529 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2530 2531 if (const PointerType *PT = T->getAs<PointerType>()) { 2532 // Find the innermost pointer type. 2533 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2534 PT = T; 2535 2536 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2537 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2538 } 2539 2540 const RecordType *RT = T->getAs<RecordType>(); 2541 if (!RT) 2542 return false; 2543 2544 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2545 2546 // We can't answer whether something is abstract until it has a 2547 // definition. If it's currently being defined, we'll walk back 2548 // over all the declarations when we have a full definition. 2549 const CXXRecordDecl *Def = RD->getDefinition(); 2550 if (!Def || Def->isBeingDefined()) 2551 return false; 2552 2553 if (!RD->isAbstract()) 2554 return false; 2555 2556 Diag(Loc, PD) << RD->getDeclName(); 2557 DiagnoseAbstractType(RD); 2558 2559 return true; 2560} 2561 2562void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2563 // Check if we've already emitted the list of pure virtual functions 2564 // for this class. 2565 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2566 return; 2567 2568 CXXFinalOverriderMap FinalOverriders; 2569 RD->getFinalOverriders(FinalOverriders); 2570 2571 // Keep a set of seen pure methods so we won't diagnose the same method 2572 // more than once. 2573 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2574 2575 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2576 MEnd = FinalOverriders.end(); 2577 M != MEnd; 2578 ++M) { 2579 for (OverridingMethods::iterator SO = M->second.begin(), 2580 SOEnd = M->second.end(); 2581 SO != SOEnd; ++SO) { 2582 // C++ [class.abstract]p4: 2583 // A class is abstract if it contains or inherits at least one 2584 // pure virtual function for which the final overrider is pure 2585 // virtual. 2586 2587 // 2588 if (SO->second.size() != 1) 2589 continue; 2590 2591 if (!SO->second.front().Method->isPure()) 2592 continue; 2593 2594 if (!SeenPureMethods.insert(SO->second.front().Method)) 2595 continue; 2596 2597 Diag(SO->second.front().Method->getLocation(), 2598 diag::note_pure_virtual_function) 2599 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2600 } 2601 } 2602 2603 if (!PureVirtualClassDiagSet) 2604 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2605 PureVirtualClassDiagSet->insert(RD); 2606} 2607 2608namespace { 2609struct AbstractUsageInfo { 2610 Sema &S; 2611 CXXRecordDecl *Record; 2612 CanQualType AbstractType; 2613 bool Invalid; 2614 2615 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2616 : S(S), Record(Record), 2617 AbstractType(S.Context.getCanonicalType( 2618 S.Context.getTypeDeclType(Record))), 2619 Invalid(false) {} 2620 2621 void DiagnoseAbstractType() { 2622 if (Invalid) return; 2623 S.DiagnoseAbstractType(Record); 2624 Invalid = true; 2625 } 2626 2627 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2628}; 2629 2630struct CheckAbstractUsage { 2631 AbstractUsageInfo &Info; 2632 const NamedDecl *Ctx; 2633 2634 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2635 : Info(Info), Ctx(Ctx) {} 2636 2637 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2638 switch (TL.getTypeLocClass()) { 2639#define ABSTRACT_TYPELOC(CLASS, PARENT) 2640#define TYPELOC(CLASS, PARENT) \ 2641 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2642#include "clang/AST/TypeLocNodes.def" 2643 } 2644 } 2645 2646 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2647 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2648 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2649 if (!TL.getArg(I)) 2650 continue; 2651 2652 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2653 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2654 } 2655 } 2656 2657 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2658 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2659 } 2660 2661 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2662 // Visit the type parameters from a permissive context. 2663 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2664 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2665 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2666 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2667 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2668 // TODO: other template argument types? 2669 } 2670 } 2671 2672 // Visit pointee types from a permissive context. 2673#define CheckPolymorphic(Type) \ 2674 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2675 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2676 } 2677 CheckPolymorphic(PointerTypeLoc) 2678 CheckPolymorphic(ReferenceTypeLoc) 2679 CheckPolymorphic(MemberPointerTypeLoc) 2680 CheckPolymorphic(BlockPointerTypeLoc) 2681 2682 /// Handle all the types we haven't given a more specific 2683 /// implementation for above. 2684 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2685 // Every other kind of type that we haven't called out already 2686 // that has an inner type is either (1) sugar or (2) contains that 2687 // inner type in some way as a subobject. 2688 if (TypeLoc Next = TL.getNextTypeLoc()) 2689 return Visit(Next, Sel); 2690 2691 // If there's no inner type and we're in a permissive context, 2692 // don't diagnose. 2693 if (Sel == Sema::AbstractNone) return; 2694 2695 // Check whether the type matches the abstract type. 2696 QualType T = TL.getType(); 2697 if (T->isArrayType()) { 2698 Sel = Sema::AbstractArrayType; 2699 T = Info.S.Context.getBaseElementType(T); 2700 } 2701 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2702 if (CT != Info.AbstractType) return; 2703 2704 // It matched; do some magic. 2705 if (Sel == Sema::AbstractArrayType) { 2706 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2707 << T << TL.getSourceRange(); 2708 } else { 2709 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2710 << Sel << T << TL.getSourceRange(); 2711 } 2712 Info.DiagnoseAbstractType(); 2713 } 2714}; 2715 2716void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2717 Sema::AbstractDiagSelID Sel) { 2718 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2719} 2720 2721} 2722 2723/// Check for invalid uses of an abstract type in a method declaration. 2724static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2725 CXXMethodDecl *MD) { 2726 // No need to do the check on definitions, which require that 2727 // the return/param types be complete. 2728 if (MD->isThisDeclarationADefinition()) 2729 return; 2730 2731 // For safety's sake, just ignore it if we don't have type source 2732 // information. This should never happen for non-implicit methods, 2733 // but... 2734 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2735 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2736} 2737 2738/// Check for invalid uses of an abstract type within a class definition. 2739static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2740 CXXRecordDecl *RD) { 2741 for (CXXRecordDecl::decl_iterator 2742 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2743 Decl *D = *I; 2744 if (D->isImplicit()) continue; 2745 2746 // Methods and method templates. 2747 if (isa<CXXMethodDecl>(D)) { 2748 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2749 } else if (isa<FunctionTemplateDecl>(D)) { 2750 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2751 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2752 2753 // Fields and static variables. 2754 } else if (isa<FieldDecl>(D)) { 2755 FieldDecl *FD = cast<FieldDecl>(D); 2756 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2757 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2758 } else if (isa<VarDecl>(D)) { 2759 VarDecl *VD = cast<VarDecl>(D); 2760 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2761 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2762 2763 // Nested classes and class templates. 2764 } else if (isa<CXXRecordDecl>(D)) { 2765 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2766 } else if (isa<ClassTemplateDecl>(D)) { 2767 CheckAbstractClassUsage(Info, 2768 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2769 } 2770 } 2771} 2772 2773/// \brief Perform semantic checks on a class definition that has been 2774/// completing, introducing implicitly-declared members, checking for 2775/// abstract types, etc. 2776void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2777 if (!Record) 2778 return; 2779 2780 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2781 AbstractUsageInfo Info(*this, Record); 2782 CheckAbstractClassUsage(Info, Record); 2783 } 2784 2785 // If this is not an aggregate type and has no user-declared constructor, 2786 // complain about any non-static data members of reference or const scalar 2787 // type, since they will never get initializers. 2788 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2789 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2790 bool Complained = false; 2791 for (RecordDecl::field_iterator F = Record->field_begin(), 2792 FEnd = Record->field_end(); 2793 F != FEnd; ++F) { 2794 if (F->getType()->isReferenceType() || 2795 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2796 if (!Complained) { 2797 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2798 << Record->getTagKind() << Record; 2799 Complained = true; 2800 } 2801 2802 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2803 << F->getType()->isReferenceType() 2804 << F->getDeclName(); 2805 } 2806 } 2807 } 2808 2809 if (Record->isDynamicClass() && !Record->isDependentType()) 2810 DynamicClasses.push_back(Record); 2811 2812 if (Record->getIdentifier()) { 2813 // C++ [class.mem]p13: 2814 // If T is the name of a class, then each of the following shall have a 2815 // name different from T: 2816 // - every member of every anonymous union that is a member of class T. 2817 // 2818 // C++ [class.mem]p14: 2819 // In addition, if class T has a user-declared constructor (12.1), every 2820 // non-static data member of class T shall have a name different from T. 2821 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2822 R.first != R.second; ++R.first) { 2823 NamedDecl *D = *R.first; 2824 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2825 isa<IndirectFieldDecl>(D)) { 2826 Diag(D->getLocation(), diag::err_member_name_of_class) 2827 << D->getDeclName(); 2828 break; 2829 } 2830 } 2831 } 2832 2833 // Warn if the class has virtual methods but non-virtual public destructor. 2834 if (Record->isPolymorphic() && !Record->isDependentType()) { 2835 CXXDestructorDecl *dtor = Record->getDestructor(); 2836 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2837 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2838 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2839 } 2840 2841 // See if a method overloads virtual methods in a base 2842 /// class without overriding any. 2843 if (!Record->isDependentType()) { 2844 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2845 MEnd = Record->method_end(); 2846 M != MEnd; ++M) { 2847 if (!(*M)->isStatic()) 2848 DiagnoseHiddenVirtualMethods(Record, *M); 2849 } 2850 } 2851 2852 // Declare inherited constructors. We do this eagerly here because: 2853 // - The standard requires an eager diagnostic for conflicting inherited 2854 // constructors from different classes. 2855 // - The lazy declaration of the other implicit constructors is so as to not 2856 // waste space and performance on classes that are not meant to be 2857 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2858 // have inherited constructors. 2859 DeclareInheritedConstructors(Record); 2860} 2861 2862/// \brief Data used with FindHiddenVirtualMethod 2863namespace { 2864 struct FindHiddenVirtualMethodData { 2865 Sema *S; 2866 CXXMethodDecl *Method; 2867 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2868 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2869 }; 2870} 2871 2872/// \brief Member lookup function that determines whether a given C++ 2873/// method overloads virtual methods in a base class without overriding any, 2874/// to be used with CXXRecordDecl::lookupInBases(). 2875static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2876 CXXBasePath &Path, 2877 void *UserData) { 2878 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2879 2880 FindHiddenVirtualMethodData &Data 2881 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2882 2883 DeclarationName Name = Data.Method->getDeclName(); 2884 assert(Name.getNameKind() == DeclarationName::Identifier); 2885 2886 bool foundSameNameMethod = false; 2887 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2888 for (Path.Decls = BaseRecord->lookup(Name); 2889 Path.Decls.first != Path.Decls.second; 2890 ++Path.Decls.first) { 2891 NamedDecl *D = *Path.Decls.first; 2892 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2893 MD = MD->getCanonicalDecl(); 2894 foundSameNameMethod = true; 2895 // Interested only in hidden virtual methods. 2896 if (!MD->isVirtual()) 2897 continue; 2898 // If the method we are checking overrides a method from its base 2899 // don't warn about the other overloaded methods. 2900 if (!Data.S->IsOverload(Data.Method, MD, false)) 2901 return true; 2902 // Collect the overload only if its hidden. 2903 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2904 overloadedMethods.push_back(MD); 2905 } 2906 } 2907 2908 if (foundSameNameMethod) 2909 Data.OverloadedMethods.append(overloadedMethods.begin(), 2910 overloadedMethods.end()); 2911 return foundSameNameMethod; 2912} 2913 2914/// \brief See if a method overloads virtual methods in a base class without 2915/// overriding any. 2916void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2917 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2918 MD->getLocation()) == Diagnostic::Ignored) 2919 return; 2920 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2921 return; 2922 2923 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2924 /*bool RecordPaths=*/false, 2925 /*bool DetectVirtual=*/false); 2926 FindHiddenVirtualMethodData Data; 2927 Data.Method = MD; 2928 Data.S = this; 2929 2930 // Keep the base methods that were overriden or introduced in the subclass 2931 // by 'using' in a set. A base method not in this set is hidden. 2932 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2933 res.first != res.second; ++res.first) { 2934 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2935 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2936 E = MD->end_overridden_methods(); 2937 I != E; ++I) 2938 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2939 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2940 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2941 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2942 } 2943 2944 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2945 !Data.OverloadedMethods.empty()) { 2946 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2947 << MD << (Data.OverloadedMethods.size() > 1); 2948 2949 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2950 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2951 Diag(overloadedMD->getLocation(), 2952 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2953 } 2954 } 2955} 2956 2957void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2958 Decl *TagDecl, 2959 SourceLocation LBrac, 2960 SourceLocation RBrac, 2961 AttributeList *AttrList) { 2962 if (!TagDecl) 2963 return; 2964 2965 AdjustDeclIfTemplate(TagDecl); 2966 2967 ActOnFields(S, RLoc, TagDecl, 2968 // strict aliasing violation! 2969 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2970 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2971 2972 CheckCompletedCXXClass( 2973 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2974} 2975 2976namespace { 2977 /// \brief Helper class that collects exception specifications for 2978 /// implicitly-declared special member functions. 2979 class ImplicitExceptionSpecification { 2980 ASTContext &Context; 2981 bool AllowsAllExceptions; 2982 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2983 llvm::SmallVector<QualType, 4> Exceptions; 2984 2985 public: 2986 explicit ImplicitExceptionSpecification(ASTContext &Context) 2987 : Context(Context), AllowsAllExceptions(false) { } 2988 2989 /// \brief Whether the special member function should have any 2990 /// exception specification at all. 2991 bool hasExceptionSpecification() const { 2992 return !AllowsAllExceptions; 2993 } 2994 2995 /// \brief Whether the special member function should have a 2996 /// throw(...) exception specification (a Microsoft extension). 2997 bool hasAnyExceptionSpecification() const { 2998 return false; 2999 } 3000 3001 /// \brief The number of exceptions in the exception specification. 3002 unsigned size() const { return Exceptions.size(); } 3003 3004 /// \brief The set of exceptions in the exception specification. 3005 const QualType *data() const { return Exceptions.data(); } 3006 3007 /// \brief Note that 3008 void CalledDecl(CXXMethodDecl *Method) { 3009 // If we already know that we allow all exceptions, do nothing. 3010 if (AllowsAllExceptions || !Method) 3011 return; 3012 3013 const FunctionProtoType *Proto 3014 = Method->getType()->getAs<FunctionProtoType>(); 3015 3016 // If this function can throw any exceptions, make a note of that. 3017 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 3018 AllowsAllExceptions = true; 3019 ExceptionsSeen.clear(); 3020 Exceptions.clear(); 3021 return; 3022 } 3023 3024 // Record the exceptions in this function's exception specification. 3025 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3026 EEnd = Proto->exception_end(); 3027 E != EEnd; ++E) 3028 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3029 Exceptions.push_back(*E); 3030 } 3031 }; 3032} 3033 3034 3035/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3036/// special functions, such as the default constructor, copy 3037/// constructor, or destructor, to the given C++ class (C++ 3038/// [special]p1). This routine can only be executed just before the 3039/// definition of the class is complete. 3040void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3041 if (!ClassDecl->hasUserDeclaredConstructor()) 3042 ++ASTContext::NumImplicitDefaultConstructors; 3043 3044 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3045 ++ASTContext::NumImplicitCopyConstructors; 3046 3047 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3048 ++ASTContext::NumImplicitCopyAssignmentOperators; 3049 3050 // If we have a dynamic class, then the copy assignment operator may be 3051 // virtual, so we have to declare it immediately. This ensures that, e.g., 3052 // it shows up in the right place in the vtable and that we diagnose 3053 // problems with the implicit exception specification. 3054 if (ClassDecl->isDynamicClass()) 3055 DeclareImplicitCopyAssignment(ClassDecl); 3056 } 3057 3058 if (!ClassDecl->hasUserDeclaredDestructor()) { 3059 ++ASTContext::NumImplicitDestructors; 3060 3061 // If we have a dynamic class, then the destructor may be virtual, so we 3062 // have to declare the destructor immediately. This ensures that, e.g., it 3063 // shows up in the right place in the vtable and that we diagnose problems 3064 // with the implicit exception specification. 3065 if (ClassDecl->isDynamicClass()) 3066 DeclareImplicitDestructor(ClassDecl); 3067 } 3068} 3069 3070void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3071 if (!D) 3072 return; 3073 3074 TemplateParameterList *Params = 0; 3075 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3076 Params = Template->getTemplateParameters(); 3077 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3078 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3079 Params = PartialSpec->getTemplateParameters(); 3080 else 3081 return; 3082 3083 for (TemplateParameterList::iterator Param = Params->begin(), 3084 ParamEnd = Params->end(); 3085 Param != ParamEnd; ++Param) { 3086 NamedDecl *Named = cast<NamedDecl>(*Param); 3087 if (Named->getDeclName()) { 3088 S->AddDecl(Named); 3089 IdResolver.AddDecl(Named); 3090 } 3091 } 3092} 3093 3094void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3095 if (!RecordD) return; 3096 AdjustDeclIfTemplate(RecordD); 3097 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3098 PushDeclContext(S, Record); 3099} 3100 3101void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3102 if (!RecordD) return; 3103 PopDeclContext(); 3104} 3105 3106/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3107/// parsing a top-level (non-nested) C++ class, and we are now 3108/// parsing those parts of the given Method declaration that could 3109/// not be parsed earlier (C++ [class.mem]p2), such as default 3110/// arguments. This action should enter the scope of the given 3111/// Method declaration as if we had just parsed the qualified method 3112/// name. However, it should not bring the parameters into scope; 3113/// that will be performed by ActOnDelayedCXXMethodParameter. 3114void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3115} 3116 3117/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3118/// C++ method declaration. We're (re-)introducing the given 3119/// function parameter into scope for use in parsing later parts of 3120/// the method declaration. For example, we could see an 3121/// ActOnParamDefaultArgument event for this parameter. 3122void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3123 if (!ParamD) 3124 return; 3125 3126 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3127 3128 // If this parameter has an unparsed default argument, clear it out 3129 // to make way for the parsed default argument. 3130 if (Param->hasUnparsedDefaultArg()) 3131 Param->setDefaultArg(0); 3132 3133 S->AddDecl(Param); 3134 if (Param->getDeclName()) 3135 IdResolver.AddDecl(Param); 3136} 3137 3138/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3139/// processing the delayed method declaration for Method. The method 3140/// declaration is now considered finished. There may be a separate 3141/// ActOnStartOfFunctionDef action later (not necessarily 3142/// immediately!) for this method, if it was also defined inside the 3143/// class body. 3144void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3145 if (!MethodD) 3146 return; 3147 3148 AdjustDeclIfTemplate(MethodD); 3149 3150 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3151 3152 // Now that we have our default arguments, check the constructor 3153 // again. It could produce additional diagnostics or affect whether 3154 // the class has implicitly-declared destructors, among other 3155 // things. 3156 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3157 CheckConstructor(Constructor); 3158 3159 // Check the default arguments, which we may have added. 3160 if (!Method->isInvalidDecl()) 3161 CheckCXXDefaultArguments(Method); 3162} 3163 3164/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3165/// the well-formedness of the constructor declarator @p D with type @p 3166/// R. If there are any errors in the declarator, this routine will 3167/// emit diagnostics and set the invalid bit to true. In any case, the type 3168/// will be updated to reflect a well-formed type for the constructor and 3169/// returned. 3170QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3171 StorageClass &SC) { 3172 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3173 3174 // C++ [class.ctor]p3: 3175 // A constructor shall not be virtual (10.3) or static (9.4). A 3176 // constructor can be invoked for a const, volatile or const 3177 // volatile object. A constructor shall not be declared const, 3178 // volatile, or const volatile (9.3.2). 3179 if (isVirtual) { 3180 if (!D.isInvalidType()) 3181 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3182 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3183 << SourceRange(D.getIdentifierLoc()); 3184 D.setInvalidType(); 3185 } 3186 if (SC == SC_Static) { 3187 if (!D.isInvalidType()) 3188 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3189 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3190 << SourceRange(D.getIdentifierLoc()); 3191 D.setInvalidType(); 3192 SC = SC_None; 3193 } 3194 3195 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3196 if (FTI.TypeQuals != 0) { 3197 if (FTI.TypeQuals & Qualifiers::Const) 3198 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3199 << "const" << SourceRange(D.getIdentifierLoc()); 3200 if (FTI.TypeQuals & Qualifiers::Volatile) 3201 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3202 << "volatile" << SourceRange(D.getIdentifierLoc()); 3203 if (FTI.TypeQuals & Qualifiers::Restrict) 3204 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3205 << "restrict" << SourceRange(D.getIdentifierLoc()); 3206 D.setInvalidType(); 3207 } 3208 3209 // C++0x [class.ctor]p4: 3210 // A constructor shall not be declared with a ref-qualifier. 3211 if (FTI.hasRefQualifier()) { 3212 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3213 << FTI.RefQualifierIsLValueRef 3214 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3215 D.setInvalidType(); 3216 } 3217 3218 // Rebuild the function type "R" without any type qualifiers (in 3219 // case any of the errors above fired) and with "void" as the 3220 // return type, since constructors don't have return types. 3221 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3222 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3223 return R; 3224 3225 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3226 EPI.TypeQuals = 0; 3227 EPI.RefQualifier = RQ_None; 3228 3229 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3230 Proto->getNumArgs(), EPI); 3231} 3232 3233/// CheckConstructor - Checks a fully-formed constructor for 3234/// well-formedness, issuing any diagnostics required. Returns true if 3235/// the constructor declarator is invalid. 3236void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3237 CXXRecordDecl *ClassDecl 3238 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3239 if (!ClassDecl) 3240 return Constructor->setInvalidDecl(); 3241 3242 // C++ [class.copy]p3: 3243 // A declaration of a constructor for a class X is ill-formed if 3244 // its first parameter is of type (optionally cv-qualified) X and 3245 // either there are no other parameters or else all other 3246 // parameters have default arguments. 3247 if (!Constructor->isInvalidDecl() && 3248 ((Constructor->getNumParams() == 1) || 3249 (Constructor->getNumParams() > 1 && 3250 Constructor->getParamDecl(1)->hasDefaultArg())) && 3251 Constructor->getTemplateSpecializationKind() 3252 != TSK_ImplicitInstantiation) { 3253 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3254 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3255 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3256 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3257 const char *ConstRef 3258 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3259 : " const &"; 3260 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3261 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3262 3263 // FIXME: Rather that making the constructor invalid, we should endeavor 3264 // to fix the type. 3265 Constructor->setInvalidDecl(); 3266 } 3267 } 3268} 3269 3270/// CheckDestructor - Checks a fully-formed destructor definition for 3271/// well-formedness, issuing any diagnostics required. Returns true 3272/// on error. 3273bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3274 CXXRecordDecl *RD = Destructor->getParent(); 3275 3276 if (Destructor->isVirtual()) { 3277 SourceLocation Loc; 3278 3279 if (!Destructor->isImplicit()) 3280 Loc = Destructor->getLocation(); 3281 else 3282 Loc = RD->getLocation(); 3283 3284 // If we have a virtual destructor, look up the deallocation function 3285 FunctionDecl *OperatorDelete = 0; 3286 DeclarationName Name = 3287 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3288 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3289 return true; 3290 3291 MarkDeclarationReferenced(Loc, OperatorDelete); 3292 3293 Destructor->setOperatorDelete(OperatorDelete); 3294 } 3295 3296 return false; 3297} 3298 3299static inline bool 3300FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3301 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3302 FTI.ArgInfo[0].Param && 3303 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3304} 3305 3306/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3307/// the well-formednes of the destructor declarator @p D with type @p 3308/// R. If there are any errors in the declarator, this routine will 3309/// emit diagnostics and set the declarator to invalid. Even if this happens, 3310/// will be updated to reflect a well-formed type for the destructor and 3311/// returned. 3312QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3313 StorageClass& SC) { 3314 // C++ [class.dtor]p1: 3315 // [...] A typedef-name that names a class is a class-name 3316 // (7.1.3); however, a typedef-name that names a class shall not 3317 // be used as the identifier in the declarator for a destructor 3318 // declaration. 3319 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3320 if (isa<TypedefType>(DeclaratorType)) 3321 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3322 << DeclaratorType; 3323 3324 // C++ [class.dtor]p2: 3325 // A destructor is used to destroy objects of its class type. A 3326 // destructor takes no parameters, and no return type can be 3327 // specified for it (not even void). The address of a destructor 3328 // shall not be taken. A destructor shall not be static. A 3329 // destructor can be invoked for a const, volatile or const 3330 // volatile object. A destructor shall not be declared const, 3331 // volatile or const volatile (9.3.2). 3332 if (SC == SC_Static) { 3333 if (!D.isInvalidType()) 3334 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3335 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3336 << SourceRange(D.getIdentifierLoc()) 3337 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3338 3339 SC = SC_None; 3340 } 3341 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3342 // Destructors don't have return types, but the parser will 3343 // happily parse something like: 3344 // 3345 // class X { 3346 // float ~X(); 3347 // }; 3348 // 3349 // The return type will be eliminated later. 3350 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3351 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3352 << SourceRange(D.getIdentifierLoc()); 3353 } 3354 3355 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3356 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3357 if (FTI.TypeQuals & Qualifiers::Const) 3358 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3359 << "const" << SourceRange(D.getIdentifierLoc()); 3360 if (FTI.TypeQuals & Qualifiers::Volatile) 3361 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3362 << "volatile" << SourceRange(D.getIdentifierLoc()); 3363 if (FTI.TypeQuals & Qualifiers::Restrict) 3364 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3365 << "restrict" << SourceRange(D.getIdentifierLoc()); 3366 D.setInvalidType(); 3367 } 3368 3369 // C++0x [class.dtor]p2: 3370 // A destructor shall not be declared with a ref-qualifier. 3371 if (FTI.hasRefQualifier()) { 3372 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3373 << FTI.RefQualifierIsLValueRef 3374 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3375 D.setInvalidType(); 3376 } 3377 3378 // Make sure we don't have any parameters. 3379 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3380 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3381 3382 // Delete the parameters. 3383 FTI.freeArgs(); 3384 D.setInvalidType(); 3385 } 3386 3387 // Make sure the destructor isn't variadic. 3388 if (FTI.isVariadic) { 3389 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3390 D.setInvalidType(); 3391 } 3392 3393 // Rebuild the function type "R" without any type qualifiers or 3394 // parameters (in case any of the errors above fired) and with 3395 // "void" as the return type, since destructors don't have return 3396 // types. 3397 if (!D.isInvalidType()) 3398 return R; 3399 3400 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3401 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3402 EPI.Variadic = false; 3403 EPI.TypeQuals = 0; 3404 EPI.RefQualifier = RQ_None; 3405 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3406} 3407 3408/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3409/// well-formednes of the conversion function declarator @p D with 3410/// type @p R. If there are any errors in the declarator, this routine 3411/// will emit diagnostics and return true. Otherwise, it will return 3412/// false. Either way, the type @p R will be updated to reflect a 3413/// well-formed type for the conversion operator. 3414void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3415 StorageClass& SC) { 3416 // C++ [class.conv.fct]p1: 3417 // Neither parameter types nor return type can be specified. The 3418 // type of a conversion function (8.3.5) is "function taking no 3419 // parameter returning conversion-type-id." 3420 if (SC == SC_Static) { 3421 if (!D.isInvalidType()) 3422 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3423 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3424 << SourceRange(D.getIdentifierLoc()); 3425 D.setInvalidType(); 3426 SC = SC_None; 3427 } 3428 3429 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3430 3431 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3432 // Conversion functions don't have return types, but the parser will 3433 // happily parse something like: 3434 // 3435 // class X { 3436 // float operator bool(); 3437 // }; 3438 // 3439 // The return type will be changed later anyway. 3440 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3441 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3442 << SourceRange(D.getIdentifierLoc()); 3443 D.setInvalidType(); 3444 } 3445 3446 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3447 3448 // Make sure we don't have any parameters. 3449 if (Proto->getNumArgs() > 0) { 3450 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3451 3452 // Delete the parameters. 3453 D.getFunctionTypeInfo().freeArgs(); 3454 D.setInvalidType(); 3455 } else if (Proto->isVariadic()) { 3456 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3457 D.setInvalidType(); 3458 } 3459 3460 // Diagnose "&operator bool()" and other such nonsense. This 3461 // is actually a gcc extension which we don't support. 3462 if (Proto->getResultType() != ConvType) { 3463 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3464 << Proto->getResultType(); 3465 D.setInvalidType(); 3466 ConvType = Proto->getResultType(); 3467 } 3468 3469 // C++ [class.conv.fct]p4: 3470 // The conversion-type-id shall not represent a function type nor 3471 // an array type. 3472 if (ConvType->isArrayType()) { 3473 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3474 ConvType = Context.getPointerType(ConvType); 3475 D.setInvalidType(); 3476 } else if (ConvType->isFunctionType()) { 3477 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3478 ConvType = Context.getPointerType(ConvType); 3479 D.setInvalidType(); 3480 } 3481 3482 // Rebuild the function type "R" without any parameters (in case any 3483 // of the errors above fired) and with the conversion type as the 3484 // return type. 3485 if (D.isInvalidType()) 3486 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3487 3488 // C++0x explicit conversion operators. 3489 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3490 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3491 diag::warn_explicit_conversion_functions) 3492 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3493} 3494 3495/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3496/// the declaration of the given C++ conversion function. This routine 3497/// is responsible for recording the conversion function in the C++ 3498/// class, if possible. 3499Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3500 assert(Conversion && "Expected to receive a conversion function declaration"); 3501 3502 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3503 3504 // Make sure we aren't redeclaring the conversion function. 3505 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3506 3507 // C++ [class.conv.fct]p1: 3508 // [...] A conversion function is never used to convert a 3509 // (possibly cv-qualified) object to the (possibly cv-qualified) 3510 // same object type (or a reference to it), to a (possibly 3511 // cv-qualified) base class of that type (or a reference to it), 3512 // or to (possibly cv-qualified) void. 3513 // FIXME: Suppress this warning if the conversion function ends up being a 3514 // virtual function that overrides a virtual function in a base class. 3515 QualType ClassType 3516 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3517 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3518 ConvType = ConvTypeRef->getPointeeType(); 3519 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3520 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3521 /* Suppress diagnostics for instantiations. */; 3522 else if (ConvType->isRecordType()) { 3523 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3524 if (ConvType == ClassType) 3525 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3526 << ClassType; 3527 else if (IsDerivedFrom(ClassType, ConvType)) 3528 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3529 << ClassType << ConvType; 3530 } else if (ConvType->isVoidType()) { 3531 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3532 << ClassType << ConvType; 3533 } 3534 3535 if (FunctionTemplateDecl *ConversionTemplate 3536 = Conversion->getDescribedFunctionTemplate()) 3537 return ConversionTemplate; 3538 3539 return Conversion; 3540} 3541 3542//===----------------------------------------------------------------------===// 3543// Namespace Handling 3544//===----------------------------------------------------------------------===// 3545 3546 3547 3548/// ActOnStartNamespaceDef - This is called at the start of a namespace 3549/// definition. 3550Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3551 SourceLocation InlineLoc, 3552 SourceLocation NamespaceLoc, 3553 SourceLocation IdentLoc, 3554 IdentifierInfo *II, 3555 SourceLocation LBrace, 3556 AttributeList *AttrList) { 3557 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3558 // For anonymous namespace, take the location of the left brace. 3559 SourceLocation Loc = II ? IdentLoc : LBrace; 3560 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3561 StartLoc, Loc, II); 3562 Namespc->setInline(InlineLoc.isValid()); 3563 3564 Scope *DeclRegionScope = NamespcScope->getParent(); 3565 3566 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3567 3568 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3569 PushNamespaceVisibilityAttr(Attr); 3570 3571 if (II) { 3572 // C++ [namespace.def]p2: 3573 // The identifier in an original-namespace-definition shall not 3574 // have been previously defined in the declarative region in 3575 // which the original-namespace-definition appears. The 3576 // identifier in an original-namespace-definition is the name of 3577 // the namespace. Subsequently in that declarative region, it is 3578 // treated as an original-namespace-name. 3579 // 3580 // Since namespace names are unique in their scope, and we don't 3581 // look through using directives, just 3582 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3583 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3584 3585 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3586 // This is an extended namespace definition. 3587 if (Namespc->isInline() != OrigNS->isInline()) { 3588 // inline-ness must match 3589 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3590 << Namespc->isInline(); 3591 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3592 Namespc->setInvalidDecl(); 3593 // Recover by ignoring the new namespace's inline status. 3594 Namespc->setInline(OrigNS->isInline()); 3595 } 3596 3597 // Attach this namespace decl to the chain of extended namespace 3598 // definitions. 3599 OrigNS->setNextNamespace(Namespc); 3600 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3601 3602 // Remove the previous declaration from the scope. 3603 if (DeclRegionScope->isDeclScope(OrigNS)) { 3604 IdResolver.RemoveDecl(OrigNS); 3605 DeclRegionScope->RemoveDecl(OrigNS); 3606 } 3607 } else if (PrevDecl) { 3608 // This is an invalid name redefinition. 3609 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3610 << Namespc->getDeclName(); 3611 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3612 Namespc->setInvalidDecl(); 3613 // Continue on to push Namespc as current DeclContext and return it. 3614 } else if (II->isStr("std") && 3615 CurContext->getRedeclContext()->isTranslationUnit()) { 3616 // This is the first "real" definition of the namespace "std", so update 3617 // our cache of the "std" namespace to point at this definition. 3618 if (NamespaceDecl *StdNS = getStdNamespace()) { 3619 // We had already defined a dummy namespace "std". Link this new 3620 // namespace definition to the dummy namespace "std". 3621 StdNS->setNextNamespace(Namespc); 3622 StdNS->setLocation(IdentLoc); 3623 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3624 } 3625 3626 // Make our StdNamespace cache point at the first real definition of the 3627 // "std" namespace. 3628 StdNamespace = Namespc; 3629 } 3630 3631 PushOnScopeChains(Namespc, DeclRegionScope); 3632 } else { 3633 // Anonymous namespaces. 3634 assert(Namespc->isAnonymousNamespace()); 3635 3636 // Link the anonymous namespace into its parent. 3637 NamespaceDecl *PrevDecl; 3638 DeclContext *Parent = CurContext->getRedeclContext(); 3639 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3640 PrevDecl = TU->getAnonymousNamespace(); 3641 TU->setAnonymousNamespace(Namespc); 3642 } else { 3643 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3644 PrevDecl = ND->getAnonymousNamespace(); 3645 ND->setAnonymousNamespace(Namespc); 3646 } 3647 3648 // Link the anonymous namespace with its previous declaration. 3649 if (PrevDecl) { 3650 assert(PrevDecl->isAnonymousNamespace()); 3651 assert(!PrevDecl->getNextNamespace()); 3652 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3653 PrevDecl->setNextNamespace(Namespc); 3654 3655 if (Namespc->isInline() != PrevDecl->isInline()) { 3656 // inline-ness must match 3657 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3658 << Namespc->isInline(); 3659 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3660 Namespc->setInvalidDecl(); 3661 // Recover by ignoring the new namespace's inline status. 3662 Namespc->setInline(PrevDecl->isInline()); 3663 } 3664 } 3665 3666 CurContext->addDecl(Namespc); 3667 3668 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3669 // behaves as if it were replaced by 3670 // namespace unique { /* empty body */ } 3671 // using namespace unique; 3672 // namespace unique { namespace-body } 3673 // where all occurrences of 'unique' in a translation unit are 3674 // replaced by the same identifier and this identifier differs 3675 // from all other identifiers in the entire program. 3676 3677 // We just create the namespace with an empty name and then add an 3678 // implicit using declaration, just like the standard suggests. 3679 // 3680 // CodeGen enforces the "universally unique" aspect by giving all 3681 // declarations semantically contained within an anonymous 3682 // namespace internal linkage. 3683 3684 if (!PrevDecl) { 3685 UsingDirectiveDecl* UD 3686 = UsingDirectiveDecl::Create(Context, CurContext, 3687 /* 'using' */ LBrace, 3688 /* 'namespace' */ SourceLocation(), 3689 /* qualifier */ NestedNameSpecifierLoc(), 3690 /* identifier */ SourceLocation(), 3691 Namespc, 3692 /* Ancestor */ CurContext); 3693 UD->setImplicit(); 3694 CurContext->addDecl(UD); 3695 } 3696 } 3697 3698 // Although we could have an invalid decl (i.e. the namespace name is a 3699 // redefinition), push it as current DeclContext and try to continue parsing. 3700 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3701 // for the namespace has the declarations that showed up in that particular 3702 // namespace definition. 3703 PushDeclContext(NamespcScope, Namespc); 3704 return Namespc; 3705} 3706 3707/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3708/// is a namespace alias, returns the namespace it points to. 3709static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3710 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3711 return AD->getNamespace(); 3712 return dyn_cast_or_null<NamespaceDecl>(D); 3713} 3714 3715/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3716/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3717void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3718 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3719 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3720 Namespc->setRBraceLoc(RBrace); 3721 PopDeclContext(); 3722 if (Namespc->hasAttr<VisibilityAttr>()) 3723 PopPragmaVisibility(); 3724} 3725 3726CXXRecordDecl *Sema::getStdBadAlloc() const { 3727 return cast_or_null<CXXRecordDecl>( 3728 StdBadAlloc.get(Context.getExternalSource())); 3729} 3730 3731NamespaceDecl *Sema::getStdNamespace() const { 3732 return cast_or_null<NamespaceDecl>( 3733 StdNamespace.get(Context.getExternalSource())); 3734} 3735 3736/// \brief Retrieve the special "std" namespace, which may require us to 3737/// implicitly define the namespace. 3738NamespaceDecl *Sema::getOrCreateStdNamespace() { 3739 if (!StdNamespace) { 3740 // The "std" namespace has not yet been defined, so build one implicitly. 3741 StdNamespace = NamespaceDecl::Create(Context, 3742 Context.getTranslationUnitDecl(), 3743 SourceLocation(), SourceLocation(), 3744 &PP.getIdentifierTable().get("std")); 3745 getStdNamespace()->setImplicit(true); 3746 } 3747 3748 return getStdNamespace(); 3749} 3750 3751Decl *Sema::ActOnUsingDirective(Scope *S, 3752 SourceLocation UsingLoc, 3753 SourceLocation NamespcLoc, 3754 CXXScopeSpec &SS, 3755 SourceLocation IdentLoc, 3756 IdentifierInfo *NamespcName, 3757 AttributeList *AttrList) { 3758 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3759 assert(NamespcName && "Invalid NamespcName."); 3760 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3761 3762 // This can only happen along a recovery path. 3763 while (S->getFlags() & Scope::TemplateParamScope) 3764 S = S->getParent(); 3765 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3766 3767 UsingDirectiveDecl *UDir = 0; 3768 NestedNameSpecifier *Qualifier = 0; 3769 if (SS.isSet()) 3770 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3771 3772 // Lookup namespace name. 3773 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3774 LookupParsedName(R, S, &SS); 3775 if (R.isAmbiguous()) 3776 return 0; 3777 3778 if (R.empty()) { 3779 // Allow "using namespace std;" or "using namespace ::std;" even if 3780 // "std" hasn't been defined yet, for GCC compatibility. 3781 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3782 NamespcName->isStr("std")) { 3783 Diag(IdentLoc, diag::ext_using_undefined_std); 3784 R.addDecl(getOrCreateStdNamespace()); 3785 R.resolveKind(); 3786 } 3787 // Otherwise, attempt typo correction. 3788 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3789 CTC_NoKeywords, 0)) { 3790 if (R.getAsSingle<NamespaceDecl>() || 3791 R.getAsSingle<NamespaceAliasDecl>()) { 3792 if (DeclContext *DC = computeDeclContext(SS, false)) 3793 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3794 << NamespcName << DC << Corrected << SS.getRange() 3795 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3796 else 3797 Diag(IdentLoc, diag::err_using_directive_suggest) 3798 << NamespcName << Corrected 3799 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3800 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3801 << Corrected; 3802 3803 NamespcName = Corrected.getAsIdentifierInfo(); 3804 } else { 3805 R.clear(); 3806 R.setLookupName(NamespcName); 3807 } 3808 } 3809 } 3810 3811 if (!R.empty()) { 3812 NamedDecl *Named = R.getFoundDecl(); 3813 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3814 && "expected namespace decl"); 3815 // C++ [namespace.udir]p1: 3816 // A using-directive specifies that the names in the nominated 3817 // namespace can be used in the scope in which the 3818 // using-directive appears after the using-directive. During 3819 // unqualified name lookup (3.4.1), the names appear as if they 3820 // were declared in the nearest enclosing namespace which 3821 // contains both the using-directive and the nominated 3822 // namespace. [Note: in this context, "contains" means "contains 3823 // directly or indirectly". ] 3824 3825 // Find enclosing context containing both using-directive and 3826 // nominated namespace. 3827 NamespaceDecl *NS = getNamespaceDecl(Named); 3828 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3829 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3830 CommonAncestor = CommonAncestor->getParent(); 3831 3832 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3833 SS.getWithLocInContext(Context), 3834 IdentLoc, Named, CommonAncestor); 3835 PushUsingDirective(S, UDir); 3836 } else { 3837 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3838 } 3839 3840 // FIXME: We ignore attributes for now. 3841 return UDir; 3842} 3843 3844void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3845 // If scope has associated entity, then using directive is at namespace 3846 // or translation unit scope. We add UsingDirectiveDecls, into 3847 // it's lookup structure. 3848 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3849 Ctx->addDecl(UDir); 3850 else 3851 // Otherwise it is block-sope. using-directives will affect lookup 3852 // only to the end of scope. 3853 S->PushUsingDirective(UDir); 3854} 3855 3856 3857Decl *Sema::ActOnUsingDeclaration(Scope *S, 3858 AccessSpecifier AS, 3859 bool HasUsingKeyword, 3860 SourceLocation UsingLoc, 3861 CXXScopeSpec &SS, 3862 UnqualifiedId &Name, 3863 AttributeList *AttrList, 3864 bool IsTypeName, 3865 SourceLocation TypenameLoc) { 3866 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3867 3868 switch (Name.getKind()) { 3869 case UnqualifiedId::IK_Identifier: 3870 case UnqualifiedId::IK_OperatorFunctionId: 3871 case UnqualifiedId::IK_LiteralOperatorId: 3872 case UnqualifiedId::IK_ConversionFunctionId: 3873 break; 3874 3875 case UnqualifiedId::IK_ConstructorName: 3876 case UnqualifiedId::IK_ConstructorTemplateId: 3877 // C++0x inherited constructors. 3878 if (getLangOptions().CPlusPlus0x) break; 3879 3880 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3881 << SS.getRange(); 3882 return 0; 3883 3884 case UnqualifiedId::IK_DestructorName: 3885 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3886 << SS.getRange(); 3887 return 0; 3888 3889 case UnqualifiedId::IK_TemplateId: 3890 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3891 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3892 return 0; 3893 } 3894 3895 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3896 DeclarationName TargetName = TargetNameInfo.getName(); 3897 if (!TargetName) 3898 return 0; 3899 3900 // Warn about using declarations. 3901 // TODO: store that the declaration was written without 'using' and 3902 // talk about access decls instead of using decls in the 3903 // diagnostics. 3904 if (!HasUsingKeyword) { 3905 UsingLoc = Name.getSourceRange().getBegin(); 3906 3907 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3908 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3909 } 3910 3911 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3912 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3913 return 0; 3914 3915 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3916 TargetNameInfo, AttrList, 3917 /* IsInstantiation */ false, 3918 IsTypeName, TypenameLoc); 3919 if (UD) 3920 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3921 3922 return UD; 3923} 3924 3925/// \brief Determine whether a using declaration considers the given 3926/// declarations as "equivalent", e.g., if they are redeclarations of 3927/// the same entity or are both typedefs of the same type. 3928static bool 3929IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3930 bool &SuppressRedeclaration) { 3931 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3932 SuppressRedeclaration = false; 3933 return true; 3934 } 3935 3936 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3937 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3938 SuppressRedeclaration = true; 3939 return Context.hasSameType(TD1->getUnderlyingType(), 3940 TD2->getUnderlyingType()); 3941 } 3942 3943 return false; 3944} 3945 3946 3947/// Determines whether to create a using shadow decl for a particular 3948/// decl, given the set of decls existing prior to this using lookup. 3949bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3950 const LookupResult &Previous) { 3951 // Diagnose finding a decl which is not from a base class of the 3952 // current class. We do this now because there are cases where this 3953 // function will silently decide not to build a shadow decl, which 3954 // will pre-empt further diagnostics. 3955 // 3956 // We don't need to do this in C++0x because we do the check once on 3957 // the qualifier. 3958 // 3959 // FIXME: diagnose the following if we care enough: 3960 // struct A { int foo; }; 3961 // struct B : A { using A::foo; }; 3962 // template <class T> struct C : A {}; 3963 // template <class T> struct D : C<T> { using B::foo; } // <--- 3964 // This is invalid (during instantiation) in C++03 because B::foo 3965 // resolves to the using decl in B, which is not a base class of D<T>. 3966 // We can't diagnose it immediately because C<T> is an unknown 3967 // specialization. The UsingShadowDecl in D<T> then points directly 3968 // to A::foo, which will look well-formed when we instantiate. 3969 // The right solution is to not collapse the shadow-decl chain. 3970 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3971 DeclContext *OrigDC = Orig->getDeclContext(); 3972 3973 // Handle enums and anonymous structs. 3974 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3975 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3976 while (OrigRec->isAnonymousStructOrUnion()) 3977 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3978 3979 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3980 if (OrigDC == CurContext) { 3981 Diag(Using->getLocation(), 3982 diag::err_using_decl_nested_name_specifier_is_current_class) 3983 << Using->getQualifierLoc().getSourceRange(); 3984 Diag(Orig->getLocation(), diag::note_using_decl_target); 3985 return true; 3986 } 3987 3988 Diag(Using->getQualifierLoc().getBeginLoc(), 3989 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3990 << Using->getQualifier() 3991 << cast<CXXRecordDecl>(CurContext) 3992 << Using->getQualifierLoc().getSourceRange(); 3993 Diag(Orig->getLocation(), diag::note_using_decl_target); 3994 return true; 3995 } 3996 } 3997 3998 if (Previous.empty()) return false; 3999 4000 NamedDecl *Target = Orig; 4001 if (isa<UsingShadowDecl>(Target)) 4002 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4003 4004 // If the target happens to be one of the previous declarations, we 4005 // don't have a conflict. 4006 // 4007 // FIXME: but we might be increasing its access, in which case we 4008 // should redeclare it. 4009 NamedDecl *NonTag = 0, *Tag = 0; 4010 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4011 I != E; ++I) { 4012 NamedDecl *D = (*I)->getUnderlyingDecl(); 4013 bool Result; 4014 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4015 return Result; 4016 4017 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4018 } 4019 4020 if (Target->isFunctionOrFunctionTemplate()) { 4021 FunctionDecl *FD; 4022 if (isa<FunctionTemplateDecl>(Target)) 4023 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4024 else 4025 FD = cast<FunctionDecl>(Target); 4026 4027 NamedDecl *OldDecl = 0; 4028 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4029 case Ovl_Overload: 4030 return false; 4031 4032 case Ovl_NonFunction: 4033 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4034 break; 4035 4036 // We found a decl with the exact signature. 4037 case Ovl_Match: 4038 // If we're in a record, we want to hide the target, so we 4039 // return true (without a diagnostic) to tell the caller not to 4040 // build a shadow decl. 4041 if (CurContext->isRecord()) 4042 return true; 4043 4044 // If we're not in a record, this is an error. 4045 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4046 break; 4047 } 4048 4049 Diag(Target->getLocation(), diag::note_using_decl_target); 4050 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4051 return true; 4052 } 4053 4054 // Target is not a function. 4055 4056 if (isa<TagDecl>(Target)) { 4057 // No conflict between a tag and a non-tag. 4058 if (!Tag) return false; 4059 4060 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4061 Diag(Target->getLocation(), diag::note_using_decl_target); 4062 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4063 return true; 4064 } 4065 4066 // No conflict between a tag and a non-tag. 4067 if (!NonTag) return false; 4068 4069 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4070 Diag(Target->getLocation(), diag::note_using_decl_target); 4071 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4072 return true; 4073} 4074 4075/// Builds a shadow declaration corresponding to a 'using' declaration. 4076UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4077 UsingDecl *UD, 4078 NamedDecl *Orig) { 4079 4080 // If we resolved to another shadow declaration, just coalesce them. 4081 NamedDecl *Target = Orig; 4082 if (isa<UsingShadowDecl>(Target)) { 4083 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4084 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4085 } 4086 4087 UsingShadowDecl *Shadow 4088 = UsingShadowDecl::Create(Context, CurContext, 4089 UD->getLocation(), UD, Target); 4090 UD->addShadowDecl(Shadow); 4091 4092 Shadow->setAccess(UD->getAccess()); 4093 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4094 Shadow->setInvalidDecl(); 4095 4096 if (S) 4097 PushOnScopeChains(Shadow, S); 4098 else 4099 CurContext->addDecl(Shadow); 4100 4101 4102 return Shadow; 4103} 4104 4105/// Hides a using shadow declaration. This is required by the current 4106/// using-decl implementation when a resolvable using declaration in a 4107/// class is followed by a declaration which would hide or override 4108/// one or more of the using decl's targets; for example: 4109/// 4110/// struct Base { void foo(int); }; 4111/// struct Derived : Base { 4112/// using Base::foo; 4113/// void foo(int); 4114/// }; 4115/// 4116/// The governing language is C++03 [namespace.udecl]p12: 4117/// 4118/// When a using-declaration brings names from a base class into a 4119/// derived class scope, member functions in the derived class 4120/// override and/or hide member functions with the same name and 4121/// parameter types in a base class (rather than conflicting). 4122/// 4123/// There are two ways to implement this: 4124/// (1) optimistically create shadow decls when they're not hidden 4125/// by existing declarations, or 4126/// (2) don't create any shadow decls (or at least don't make them 4127/// visible) until we've fully parsed/instantiated the class. 4128/// The problem with (1) is that we might have to retroactively remove 4129/// a shadow decl, which requires several O(n) operations because the 4130/// decl structures are (very reasonably) not designed for removal. 4131/// (2) avoids this but is very fiddly and phase-dependent. 4132void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4133 if (Shadow->getDeclName().getNameKind() == 4134 DeclarationName::CXXConversionFunctionName) 4135 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4136 4137 // Remove it from the DeclContext... 4138 Shadow->getDeclContext()->removeDecl(Shadow); 4139 4140 // ...and the scope, if applicable... 4141 if (S) { 4142 S->RemoveDecl(Shadow); 4143 IdResolver.RemoveDecl(Shadow); 4144 } 4145 4146 // ...and the using decl. 4147 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4148 4149 // TODO: complain somehow if Shadow was used. It shouldn't 4150 // be possible for this to happen, because...? 4151} 4152 4153/// Builds a using declaration. 4154/// 4155/// \param IsInstantiation - Whether this call arises from an 4156/// instantiation of an unresolved using declaration. We treat 4157/// the lookup differently for these declarations. 4158NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4159 SourceLocation UsingLoc, 4160 CXXScopeSpec &SS, 4161 const DeclarationNameInfo &NameInfo, 4162 AttributeList *AttrList, 4163 bool IsInstantiation, 4164 bool IsTypeName, 4165 SourceLocation TypenameLoc) { 4166 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4167 SourceLocation IdentLoc = NameInfo.getLoc(); 4168 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4169 4170 // FIXME: We ignore attributes for now. 4171 4172 if (SS.isEmpty()) { 4173 Diag(IdentLoc, diag::err_using_requires_qualname); 4174 return 0; 4175 } 4176 4177 // Do the redeclaration lookup in the current scope. 4178 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4179 ForRedeclaration); 4180 Previous.setHideTags(false); 4181 if (S) { 4182 LookupName(Previous, S); 4183 4184 // It is really dumb that we have to do this. 4185 LookupResult::Filter F = Previous.makeFilter(); 4186 while (F.hasNext()) { 4187 NamedDecl *D = F.next(); 4188 if (!isDeclInScope(D, CurContext, S)) 4189 F.erase(); 4190 } 4191 F.done(); 4192 } else { 4193 assert(IsInstantiation && "no scope in non-instantiation"); 4194 assert(CurContext->isRecord() && "scope not record in instantiation"); 4195 LookupQualifiedName(Previous, CurContext); 4196 } 4197 4198 // Check for invalid redeclarations. 4199 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4200 return 0; 4201 4202 // Check for bad qualifiers. 4203 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4204 return 0; 4205 4206 DeclContext *LookupContext = computeDeclContext(SS); 4207 NamedDecl *D; 4208 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4209 if (!LookupContext) { 4210 if (IsTypeName) { 4211 // FIXME: not all declaration name kinds are legal here 4212 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4213 UsingLoc, TypenameLoc, 4214 QualifierLoc, 4215 IdentLoc, NameInfo.getName()); 4216 } else { 4217 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4218 QualifierLoc, NameInfo); 4219 } 4220 } else { 4221 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4222 NameInfo, IsTypeName); 4223 } 4224 D->setAccess(AS); 4225 CurContext->addDecl(D); 4226 4227 if (!LookupContext) return D; 4228 UsingDecl *UD = cast<UsingDecl>(D); 4229 4230 if (RequireCompleteDeclContext(SS, LookupContext)) { 4231 UD->setInvalidDecl(); 4232 return UD; 4233 } 4234 4235 // Constructor inheriting using decls get special treatment. 4236 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4237 if (CheckInheritedConstructorUsingDecl(UD)) 4238 UD->setInvalidDecl(); 4239 return UD; 4240 } 4241 4242 // Otherwise, look up the target name. 4243 4244 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4245 4246 // Unlike most lookups, we don't always want to hide tag 4247 // declarations: tag names are visible through the using declaration 4248 // even if hidden by ordinary names, *except* in a dependent context 4249 // where it's important for the sanity of two-phase lookup. 4250 if (!IsInstantiation) 4251 R.setHideTags(false); 4252 4253 LookupQualifiedName(R, LookupContext); 4254 4255 if (R.empty()) { 4256 Diag(IdentLoc, diag::err_no_member) 4257 << NameInfo.getName() << LookupContext << SS.getRange(); 4258 UD->setInvalidDecl(); 4259 return UD; 4260 } 4261 4262 if (R.isAmbiguous()) { 4263 UD->setInvalidDecl(); 4264 return UD; 4265 } 4266 4267 if (IsTypeName) { 4268 // If we asked for a typename and got a non-type decl, error out. 4269 if (!R.getAsSingle<TypeDecl>()) { 4270 Diag(IdentLoc, diag::err_using_typename_non_type); 4271 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4272 Diag((*I)->getUnderlyingDecl()->getLocation(), 4273 diag::note_using_decl_target); 4274 UD->setInvalidDecl(); 4275 return UD; 4276 } 4277 } else { 4278 // If we asked for a non-typename and we got a type, error out, 4279 // but only if this is an instantiation of an unresolved using 4280 // decl. Otherwise just silently find the type name. 4281 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4282 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4283 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4284 UD->setInvalidDecl(); 4285 return UD; 4286 } 4287 } 4288 4289 // C++0x N2914 [namespace.udecl]p6: 4290 // A using-declaration shall not name a namespace. 4291 if (R.getAsSingle<NamespaceDecl>()) { 4292 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4293 << SS.getRange(); 4294 UD->setInvalidDecl(); 4295 return UD; 4296 } 4297 4298 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4299 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4300 BuildUsingShadowDecl(S, UD, *I); 4301 } 4302 4303 return UD; 4304} 4305 4306/// Additional checks for a using declaration referring to a constructor name. 4307bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4308 if (UD->isTypeName()) { 4309 // FIXME: Cannot specify typename when specifying constructor 4310 return true; 4311 } 4312 4313 const Type *SourceType = UD->getQualifier()->getAsType(); 4314 assert(SourceType && 4315 "Using decl naming constructor doesn't have type in scope spec."); 4316 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4317 4318 // Check whether the named type is a direct base class. 4319 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4320 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4321 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4322 BaseIt != BaseE; ++BaseIt) { 4323 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4324 if (CanonicalSourceType == BaseType) 4325 break; 4326 } 4327 4328 if (BaseIt == BaseE) { 4329 // Did not find SourceType in the bases. 4330 Diag(UD->getUsingLocation(), 4331 diag::err_using_decl_constructor_not_in_direct_base) 4332 << UD->getNameInfo().getSourceRange() 4333 << QualType(SourceType, 0) << TargetClass; 4334 return true; 4335 } 4336 4337 BaseIt->setInheritConstructors(); 4338 4339 return false; 4340} 4341 4342/// Checks that the given using declaration is not an invalid 4343/// redeclaration. Note that this is checking only for the using decl 4344/// itself, not for any ill-formedness among the UsingShadowDecls. 4345bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4346 bool isTypeName, 4347 const CXXScopeSpec &SS, 4348 SourceLocation NameLoc, 4349 const LookupResult &Prev) { 4350 // C++03 [namespace.udecl]p8: 4351 // C++0x [namespace.udecl]p10: 4352 // A using-declaration is a declaration and can therefore be used 4353 // repeatedly where (and only where) multiple declarations are 4354 // allowed. 4355 // 4356 // That's in non-member contexts. 4357 if (!CurContext->getRedeclContext()->isRecord()) 4358 return false; 4359 4360 NestedNameSpecifier *Qual 4361 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4362 4363 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4364 NamedDecl *D = *I; 4365 4366 bool DTypename; 4367 NestedNameSpecifier *DQual; 4368 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4369 DTypename = UD->isTypeName(); 4370 DQual = UD->getQualifier(); 4371 } else if (UnresolvedUsingValueDecl *UD 4372 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4373 DTypename = false; 4374 DQual = UD->getQualifier(); 4375 } else if (UnresolvedUsingTypenameDecl *UD 4376 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4377 DTypename = true; 4378 DQual = UD->getQualifier(); 4379 } else continue; 4380 4381 // using decls differ if one says 'typename' and the other doesn't. 4382 // FIXME: non-dependent using decls? 4383 if (isTypeName != DTypename) continue; 4384 4385 // using decls differ if they name different scopes (but note that 4386 // template instantiation can cause this check to trigger when it 4387 // didn't before instantiation). 4388 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4389 Context.getCanonicalNestedNameSpecifier(DQual)) 4390 continue; 4391 4392 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4393 Diag(D->getLocation(), diag::note_using_decl) << 1; 4394 return true; 4395 } 4396 4397 return false; 4398} 4399 4400 4401/// Checks that the given nested-name qualifier used in a using decl 4402/// in the current context is appropriately related to the current 4403/// scope. If an error is found, diagnoses it and returns true. 4404bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4405 const CXXScopeSpec &SS, 4406 SourceLocation NameLoc) { 4407 DeclContext *NamedContext = computeDeclContext(SS); 4408 4409 if (!CurContext->isRecord()) { 4410 // C++03 [namespace.udecl]p3: 4411 // C++0x [namespace.udecl]p8: 4412 // A using-declaration for a class member shall be a member-declaration. 4413 4414 // If we weren't able to compute a valid scope, it must be a 4415 // dependent class scope. 4416 if (!NamedContext || NamedContext->isRecord()) { 4417 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4418 << SS.getRange(); 4419 return true; 4420 } 4421 4422 // Otherwise, everything is known to be fine. 4423 return false; 4424 } 4425 4426 // The current scope is a record. 4427 4428 // If the named context is dependent, we can't decide much. 4429 if (!NamedContext) { 4430 // FIXME: in C++0x, we can diagnose if we can prove that the 4431 // nested-name-specifier does not refer to a base class, which is 4432 // still possible in some cases. 4433 4434 // Otherwise we have to conservatively report that things might be 4435 // okay. 4436 return false; 4437 } 4438 4439 if (!NamedContext->isRecord()) { 4440 // Ideally this would point at the last name in the specifier, 4441 // but we don't have that level of source info. 4442 Diag(SS.getRange().getBegin(), 4443 diag::err_using_decl_nested_name_specifier_is_not_class) 4444 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4445 return true; 4446 } 4447 4448 if (!NamedContext->isDependentContext() && 4449 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4450 return true; 4451 4452 if (getLangOptions().CPlusPlus0x) { 4453 // C++0x [namespace.udecl]p3: 4454 // In a using-declaration used as a member-declaration, the 4455 // nested-name-specifier shall name a base class of the class 4456 // being defined. 4457 4458 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4459 cast<CXXRecordDecl>(NamedContext))) { 4460 if (CurContext == NamedContext) { 4461 Diag(NameLoc, 4462 diag::err_using_decl_nested_name_specifier_is_current_class) 4463 << SS.getRange(); 4464 return true; 4465 } 4466 4467 Diag(SS.getRange().getBegin(), 4468 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4469 << (NestedNameSpecifier*) SS.getScopeRep() 4470 << cast<CXXRecordDecl>(CurContext) 4471 << SS.getRange(); 4472 return true; 4473 } 4474 4475 return false; 4476 } 4477 4478 // C++03 [namespace.udecl]p4: 4479 // A using-declaration used as a member-declaration shall refer 4480 // to a member of a base class of the class being defined [etc.]. 4481 4482 // Salient point: SS doesn't have to name a base class as long as 4483 // lookup only finds members from base classes. Therefore we can 4484 // diagnose here only if we can prove that that can't happen, 4485 // i.e. if the class hierarchies provably don't intersect. 4486 4487 // TODO: it would be nice if "definitely valid" results were cached 4488 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4489 // need to be repeated. 4490 4491 struct UserData { 4492 llvm::DenseSet<const CXXRecordDecl*> Bases; 4493 4494 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4495 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4496 Data->Bases.insert(Base); 4497 return true; 4498 } 4499 4500 bool hasDependentBases(const CXXRecordDecl *Class) { 4501 return !Class->forallBases(collect, this); 4502 } 4503 4504 /// Returns true if the base is dependent or is one of the 4505 /// accumulated base classes. 4506 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4507 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4508 return !Data->Bases.count(Base); 4509 } 4510 4511 bool mightShareBases(const CXXRecordDecl *Class) { 4512 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4513 } 4514 }; 4515 4516 UserData Data; 4517 4518 // Returns false if we find a dependent base. 4519 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4520 return false; 4521 4522 // Returns false if the class has a dependent base or if it or one 4523 // of its bases is present in the base set of the current context. 4524 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4525 return false; 4526 4527 Diag(SS.getRange().getBegin(), 4528 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4529 << (NestedNameSpecifier*) SS.getScopeRep() 4530 << cast<CXXRecordDecl>(CurContext) 4531 << SS.getRange(); 4532 4533 return true; 4534} 4535 4536Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4537 SourceLocation NamespaceLoc, 4538 SourceLocation AliasLoc, 4539 IdentifierInfo *Alias, 4540 CXXScopeSpec &SS, 4541 SourceLocation IdentLoc, 4542 IdentifierInfo *Ident) { 4543 4544 // Lookup the namespace name. 4545 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4546 LookupParsedName(R, S, &SS); 4547 4548 // Check if we have a previous declaration with the same name. 4549 NamedDecl *PrevDecl 4550 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4551 ForRedeclaration); 4552 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4553 PrevDecl = 0; 4554 4555 if (PrevDecl) { 4556 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4557 // We already have an alias with the same name that points to the same 4558 // namespace, so don't create a new one. 4559 // FIXME: At some point, we'll want to create the (redundant) 4560 // declaration to maintain better source information. 4561 if (!R.isAmbiguous() && !R.empty() && 4562 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4563 return 0; 4564 } 4565 4566 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4567 diag::err_redefinition_different_kind; 4568 Diag(AliasLoc, DiagID) << Alias; 4569 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4570 return 0; 4571 } 4572 4573 if (R.isAmbiguous()) 4574 return 0; 4575 4576 if (R.empty()) { 4577 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4578 CTC_NoKeywords, 0)) { 4579 if (R.getAsSingle<NamespaceDecl>() || 4580 R.getAsSingle<NamespaceAliasDecl>()) { 4581 if (DeclContext *DC = computeDeclContext(SS, false)) 4582 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4583 << Ident << DC << Corrected << SS.getRange() 4584 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4585 else 4586 Diag(IdentLoc, diag::err_using_directive_suggest) 4587 << Ident << Corrected 4588 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4589 4590 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4591 << Corrected; 4592 4593 Ident = Corrected.getAsIdentifierInfo(); 4594 } else { 4595 R.clear(); 4596 R.setLookupName(Ident); 4597 } 4598 } 4599 4600 if (R.empty()) { 4601 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4602 return 0; 4603 } 4604 } 4605 4606 NamespaceAliasDecl *AliasDecl = 4607 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4608 Alias, SS.getWithLocInContext(Context), 4609 IdentLoc, R.getFoundDecl()); 4610 4611 PushOnScopeChains(AliasDecl, S); 4612 return AliasDecl; 4613} 4614 4615namespace { 4616 /// \brief Scoped object used to handle the state changes required in Sema 4617 /// to implicitly define the body of a C++ member function; 4618 class ImplicitlyDefinedFunctionScope { 4619 Sema &S; 4620 Sema::ContextRAII SavedContext; 4621 4622 public: 4623 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4624 : S(S), SavedContext(S, Method) 4625 { 4626 S.PushFunctionScope(); 4627 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4628 } 4629 4630 ~ImplicitlyDefinedFunctionScope() { 4631 S.PopExpressionEvaluationContext(); 4632 S.PopFunctionOrBlockScope(); 4633 } 4634 }; 4635} 4636 4637static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4638 CXXRecordDecl *D) { 4639 ASTContext &Context = Self.Context; 4640 QualType ClassType = Context.getTypeDeclType(D); 4641 DeclarationName ConstructorName 4642 = Context.DeclarationNames.getCXXConstructorName( 4643 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4644 4645 DeclContext::lookup_const_iterator Con, ConEnd; 4646 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4647 Con != ConEnd; ++Con) { 4648 // FIXME: In C++0x, a constructor template can be a default constructor. 4649 if (isa<FunctionTemplateDecl>(*Con)) 4650 continue; 4651 4652 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4653 if (Constructor->isDefaultConstructor()) 4654 return Constructor; 4655 } 4656 return 0; 4657} 4658 4659CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4660 CXXRecordDecl *ClassDecl) { 4661 // C++ [class.ctor]p5: 4662 // A default constructor for a class X is a constructor of class X 4663 // that can be called without an argument. If there is no 4664 // user-declared constructor for class X, a default constructor is 4665 // implicitly declared. An implicitly-declared default constructor 4666 // is an inline public member of its class. 4667 assert(!ClassDecl->hasUserDeclaredConstructor() && 4668 "Should not build implicit default constructor!"); 4669 4670 // C++ [except.spec]p14: 4671 // An implicitly declared special member function (Clause 12) shall have an 4672 // exception-specification. [...] 4673 ImplicitExceptionSpecification ExceptSpec(Context); 4674 4675 // Direct base-class destructors. 4676 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4677 BEnd = ClassDecl->bases_end(); 4678 B != BEnd; ++B) { 4679 if (B->isVirtual()) // Handled below. 4680 continue; 4681 4682 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4683 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4684 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4685 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4686 else if (CXXConstructorDecl *Constructor 4687 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4688 ExceptSpec.CalledDecl(Constructor); 4689 } 4690 } 4691 4692 // Virtual base-class destructors. 4693 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4694 BEnd = ClassDecl->vbases_end(); 4695 B != BEnd; ++B) { 4696 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4697 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4698 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4699 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4700 else if (CXXConstructorDecl *Constructor 4701 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4702 ExceptSpec.CalledDecl(Constructor); 4703 } 4704 } 4705 4706 // Field destructors. 4707 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4708 FEnd = ClassDecl->field_end(); 4709 F != FEnd; ++F) { 4710 if (const RecordType *RecordTy 4711 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4712 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4713 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4714 ExceptSpec.CalledDecl( 4715 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4716 else if (CXXConstructorDecl *Constructor 4717 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4718 ExceptSpec.CalledDecl(Constructor); 4719 } 4720 } 4721 4722 FunctionProtoType::ExtProtoInfo EPI; 4723 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 4724 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 4725 EST_None; 4726 EPI.NumExceptions = ExceptSpec.size(); 4727 EPI.Exceptions = ExceptSpec.data(); 4728 4729 // Create the actual constructor declaration. 4730 CanQualType ClassType 4731 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4732 SourceLocation ClassLoc = ClassDecl->getLocation(); 4733 DeclarationName Name 4734 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4735 DeclarationNameInfo NameInfo(Name, ClassLoc); 4736 CXXConstructorDecl *DefaultCon 4737 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4738 Context.getFunctionType(Context.VoidTy, 4739 0, 0, EPI), 4740 /*TInfo=*/0, 4741 /*isExplicit=*/false, 4742 /*isInline=*/true, 4743 /*isImplicitlyDeclared=*/true); 4744 DefaultCon->setAccess(AS_public); 4745 DefaultCon->setImplicit(); 4746 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4747 4748 // Note that we have declared this constructor. 4749 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4750 4751 if (Scope *S = getScopeForContext(ClassDecl)) 4752 PushOnScopeChains(DefaultCon, S, false); 4753 ClassDecl->addDecl(DefaultCon); 4754 4755 return DefaultCon; 4756} 4757 4758void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4759 CXXConstructorDecl *Constructor) { 4760 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4761 !Constructor->isUsed(false)) && 4762 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4763 4764 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4765 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4766 4767 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4768 DiagnosticErrorTrap Trap(Diags); 4769 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4770 Trap.hasErrorOccurred()) { 4771 Diag(CurrentLocation, diag::note_member_synthesized_at) 4772 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4773 Constructor->setInvalidDecl(); 4774 return; 4775 } 4776 4777 SourceLocation Loc = Constructor->getLocation(); 4778 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4779 4780 Constructor->setUsed(); 4781 MarkVTableUsed(CurrentLocation, ClassDecl); 4782} 4783 4784void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4785 // We start with an initial pass over the base classes to collect those that 4786 // inherit constructors from. If there are none, we can forgo all further 4787 // processing. 4788 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4789 BasesVector BasesToInheritFrom; 4790 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4791 BaseE = ClassDecl->bases_end(); 4792 BaseIt != BaseE; ++BaseIt) { 4793 if (BaseIt->getInheritConstructors()) { 4794 QualType Base = BaseIt->getType(); 4795 if (Base->isDependentType()) { 4796 // If we inherit constructors from anything that is dependent, just 4797 // abort processing altogether. We'll get another chance for the 4798 // instantiations. 4799 return; 4800 } 4801 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4802 } 4803 } 4804 if (BasesToInheritFrom.empty()) 4805 return; 4806 4807 // Now collect the constructors that we already have in the current class. 4808 // Those take precedence over inherited constructors. 4809 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4810 // unless there is a user-declared constructor with the same signature in 4811 // the class where the using-declaration appears. 4812 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4813 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4814 CtorE = ClassDecl->ctor_end(); 4815 CtorIt != CtorE; ++CtorIt) { 4816 ExistingConstructors.insert( 4817 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4818 } 4819 4820 Scope *S = getScopeForContext(ClassDecl); 4821 DeclarationName CreatedCtorName = 4822 Context.DeclarationNames.getCXXConstructorName( 4823 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4824 4825 // Now comes the true work. 4826 // First, we keep a map from constructor types to the base that introduced 4827 // them. Needed for finding conflicting constructors. We also keep the 4828 // actually inserted declarations in there, for pretty diagnostics. 4829 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4830 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4831 ConstructorToSourceMap InheritedConstructors; 4832 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4833 BaseE = BasesToInheritFrom.end(); 4834 BaseIt != BaseE; ++BaseIt) { 4835 const RecordType *Base = *BaseIt; 4836 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4837 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4838 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4839 CtorE = BaseDecl->ctor_end(); 4840 CtorIt != CtorE; ++CtorIt) { 4841 // Find the using declaration for inheriting this base's constructors. 4842 DeclarationName Name = 4843 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4844 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4845 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4846 SourceLocation UsingLoc = UD ? UD->getLocation() : 4847 ClassDecl->getLocation(); 4848 4849 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4850 // from the class X named in the using-declaration consists of actual 4851 // constructors and notional constructors that result from the 4852 // transformation of defaulted parameters as follows: 4853 // - all non-template default constructors of X, and 4854 // - for each non-template constructor of X that has at least one 4855 // parameter with a default argument, the set of constructors that 4856 // results from omitting any ellipsis parameter specification and 4857 // successively omitting parameters with a default argument from the 4858 // end of the parameter-type-list. 4859 CXXConstructorDecl *BaseCtor = *CtorIt; 4860 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4861 const FunctionProtoType *BaseCtorType = 4862 BaseCtor->getType()->getAs<FunctionProtoType>(); 4863 4864 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4865 maxParams = BaseCtor->getNumParams(); 4866 params <= maxParams; ++params) { 4867 // Skip default constructors. They're never inherited. 4868 if (params == 0) 4869 continue; 4870 // Skip copy and move constructors for the same reason. 4871 if (CanBeCopyOrMove && params == 1) 4872 continue; 4873 4874 // Build up a function type for this particular constructor. 4875 // FIXME: The working paper does not consider that the exception spec 4876 // for the inheriting constructor might be larger than that of the 4877 // source. This code doesn't yet, either. 4878 const Type *NewCtorType; 4879 if (params == maxParams) 4880 NewCtorType = BaseCtorType; 4881 else { 4882 llvm::SmallVector<QualType, 16> Args; 4883 for (unsigned i = 0; i < params; ++i) { 4884 Args.push_back(BaseCtorType->getArgType(i)); 4885 } 4886 FunctionProtoType::ExtProtoInfo ExtInfo = 4887 BaseCtorType->getExtProtoInfo(); 4888 ExtInfo.Variadic = false; 4889 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4890 Args.data(), params, ExtInfo) 4891 .getTypePtr(); 4892 } 4893 const Type *CanonicalNewCtorType = 4894 Context.getCanonicalType(NewCtorType); 4895 4896 // Now that we have the type, first check if the class already has a 4897 // constructor with this signature. 4898 if (ExistingConstructors.count(CanonicalNewCtorType)) 4899 continue; 4900 4901 // Then we check if we have already declared an inherited constructor 4902 // with this signature. 4903 std::pair<ConstructorToSourceMap::iterator, bool> result = 4904 InheritedConstructors.insert(std::make_pair( 4905 CanonicalNewCtorType, 4906 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4907 if (!result.second) { 4908 // Already in the map. If it came from a different class, that's an 4909 // error. Not if it's from the same. 4910 CanQualType PreviousBase = result.first->second.first; 4911 if (CanonicalBase != PreviousBase) { 4912 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4913 const CXXConstructorDecl *PrevBaseCtor = 4914 PrevCtor->getInheritedConstructor(); 4915 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4916 4917 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4918 Diag(BaseCtor->getLocation(), 4919 diag::note_using_decl_constructor_conflict_current_ctor); 4920 Diag(PrevBaseCtor->getLocation(), 4921 diag::note_using_decl_constructor_conflict_previous_ctor); 4922 Diag(PrevCtor->getLocation(), 4923 diag::note_using_decl_constructor_conflict_previous_using); 4924 } 4925 continue; 4926 } 4927 4928 // OK, we're there, now add the constructor. 4929 // C++0x [class.inhctor]p8: [...] that would be performed by a 4930 // user-writtern inline constructor [...] 4931 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4932 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4933 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 4934 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 4935 /*ImplicitlyDeclared=*/true); 4936 NewCtor->setAccess(BaseCtor->getAccess()); 4937 4938 // Build up the parameter decls and add them. 4939 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4940 for (unsigned i = 0; i < params; ++i) { 4941 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 4942 UsingLoc, UsingLoc, 4943 /*IdentifierInfo=*/0, 4944 BaseCtorType->getArgType(i), 4945 /*TInfo=*/0, SC_None, 4946 SC_None, /*DefaultArg=*/0)); 4947 } 4948 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4949 NewCtor->setInheritedConstructor(BaseCtor); 4950 4951 PushOnScopeChains(NewCtor, S, false); 4952 ClassDecl->addDecl(NewCtor); 4953 result.first->second.second = NewCtor; 4954 } 4955 } 4956 } 4957} 4958 4959CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4960 // C++ [class.dtor]p2: 4961 // If a class has no user-declared destructor, a destructor is 4962 // declared implicitly. An implicitly-declared destructor is an 4963 // inline public member of its class. 4964 4965 // C++ [except.spec]p14: 4966 // An implicitly declared special member function (Clause 12) shall have 4967 // an exception-specification. 4968 ImplicitExceptionSpecification ExceptSpec(Context); 4969 4970 // Direct base-class destructors. 4971 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4972 BEnd = ClassDecl->bases_end(); 4973 B != BEnd; ++B) { 4974 if (B->isVirtual()) // Handled below. 4975 continue; 4976 4977 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4978 ExceptSpec.CalledDecl( 4979 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4980 } 4981 4982 // Virtual base-class destructors. 4983 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4984 BEnd = ClassDecl->vbases_end(); 4985 B != BEnd; ++B) { 4986 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4987 ExceptSpec.CalledDecl( 4988 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4989 } 4990 4991 // Field destructors. 4992 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4993 FEnd = ClassDecl->field_end(); 4994 F != FEnd; ++F) { 4995 if (const RecordType *RecordTy 4996 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4997 ExceptSpec.CalledDecl( 4998 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4999 } 5000 5001 // Create the actual destructor declaration. 5002 FunctionProtoType::ExtProtoInfo EPI; 5003 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 5004 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 5005 EST_None; 5006 EPI.NumExceptions = ExceptSpec.size(); 5007 EPI.Exceptions = ExceptSpec.data(); 5008 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5009 5010 CanQualType ClassType 5011 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5012 SourceLocation ClassLoc = ClassDecl->getLocation(); 5013 DeclarationName Name 5014 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5015 DeclarationNameInfo NameInfo(Name, ClassLoc); 5016 CXXDestructorDecl *Destructor 5017 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5018 /*isInline=*/true, 5019 /*isImplicitlyDeclared=*/true); 5020 Destructor->setAccess(AS_public); 5021 Destructor->setImplicit(); 5022 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5023 5024 // Note that we have declared this destructor. 5025 ++ASTContext::NumImplicitDestructorsDeclared; 5026 5027 // Introduce this destructor into its scope. 5028 if (Scope *S = getScopeForContext(ClassDecl)) 5029 PushOnScopeChains(Destructor, S, false); 5030 ClassDecl->addDecl(Destructor); 5031 5032 // This could be uniqued if it ever proves significant. 5033 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5034 5035 AddOverriddenMethods(ClassDecl, Destructor); 5036 5037 return Destructor; 5038} 5039 5040void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5041 CXXDestructorDecl *Destructor) { 5042 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5043 "DefineImplicitDestructor - call it for implicit default dtor"); 5044 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5045 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5046 5047 if (Destructor->isInvalidDecl()) 5048 return; 5049 5050 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5051 5052 DiagnosticErrorTrap Trap(Diags); 5053 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5054 Destructor->getParent()); 5055 5056 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5057 Diag(CurrentLocation, diag::note_member_synthesized_at) 5058 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5059 5060 Destructor->setInvalidDecl(); 5061 return; 5062 } 5063 5064 SourceLocation Loc = Destructor->getLocation(); 5065 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5066 5067 Destructor->setUsed(); 5068 MarkVTableUsed(CurrentLocation, ClassDecl); 5069} 5070 5071/// \brief Builds a statement that copies the given entity from \p From to 5072/// \c To. 5073/// 5074/// This routine is used to copy the members of a class with an 5075/// implicitly-declared copy assignment operator. When the entities being 5076/// copied are arrays, this routine builds for loops to copy them. 5077/// 5078/// \param S The Sema object used for type-checking. 5079/// 5080/// \param Loc The location where the implicit copy is being generated. 5081/// 5082/// \param T The type of the expressions being copied. Both expressions must 5083/// have this type. 5084/// 5085/// \param To The expression we are copying to. 5086/// 5087/// \param From The expression we are copying from. 5088/// 5089/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5090/// Otherwise, it's a non-static member subobject. 5091/// 5092/// \param Depth Internal parameter recording the depth of the recursion. 5093/// 5094/// \returns A statement or a loop that copies the expressions. 5095static StmtResult 5096BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5097 Expr *To, Expr *From, 5098 bool CopyingBaseSubobject, unsigned Depth = 0) { 5099 // C++0x [class.copy]p30: 5100 // Each subobject is assigned in the manner appropriate to its type: 5101 // 5102 // - if the subobject is of class type, the copy assignment operator 5103 // for the class is used (as if by explicit qualification; that is, 5104 // ignoring any possible virtual overriding functions in more derived 5105 // classes); 5106 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5107 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5108 5109 // Look for operator=. 5110 DeclarationName Name 5111 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5112 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5113 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5114 5115 // Filter out any result that isn't a copy-assignment operator. 5116 LookupResult::Filter F = OpLookup.makeFilter(); 5117 while (F.hasNext()) { 5118 NamedDecl *D = F.next(); 5119 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5120 if (Method->isCopyAssignmentOperator()) 5121 continue; 5122 5123 F.erase(); 5124 } 5125 F.done(); 5126 5127 // Suppress the protected check (C++ [class.protected]) for each of the 5128 // assignment operators we found. This strange dance is required when 5129 // we're assigning via a base classes's copy-assignment operator. To 5130 // ensure that we're getting the right base class subobject (without 5131 // ambiguities), we need to cast "this" to that subobject type; to 5132 // ensure that we don't go through the virtual call mechanism, we need 5133 // to qualify the operator= name with the base class (see below). However, 5134 // this means that if the base class has a protected copy assignment 5135 // operator, the protected member access check will fail. So, we 5136 // rewrite "protected" access to "public" access in this case, since we 5137 // know by construction that we're calling from a derived class. 5138 if (CopyingBaseSubobject) { 5139 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5140 L != LEnd; ++L) { 5141 if (L.getAccess() == AS_protected) 5142 L.setAccess(AS_public); 5143 } 5144 } 5145 5146 // Create the nested-name-specifier that will be used to qualify the 5147 // reference to operator=; this is required to suppress the virtual 5148 // call mechanism. 5149 CXXScopeSpec SS; 5150 SS.MakeTrivial(S.Context, 5151 NestedNameSpecifier::Create(S.Context, 0, false, 5152 T.getTypePtr()), 5153 Loc); 5154 5155 // Create the reference to operator=. 5156 ExprResult OpEqualRef 5157 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5158 /*FirstQualifierInScope=*/0, OpLookup, 5159 /*TemplateArgs=*/0, 5160 /*SuppressQualifierCheck=*/true); 5161 if (OpEqualRef.isInvalid()) 5162 return StmtError(); 5163 5164 // Build the call to the assignment operator. 5165 5166 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5167 OpEqualRef.takeAs<Expr>(), 5168 Loc, &From, 1, Loc); 5169 if (Call.isInvalid()) 5170 return StmtError(); 5171 5172 return S.Owned(Call.takeAs<Stmt>()); 5173 } 5174 5175 // - if the subobject is of scalar type, the built-in assignment 5176 // operator is used. 5177 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5178 if (!ArrayTy) { 5179 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5180 if (Assignment.isInvalid()) 5181 return StmtError(); 5182 5183 return S.Owned(Assignment.takeAs<Stmt>()); 5184 } 5185 5186 // - if the subobject is an array, each element is assigned, in the 5187 // manner appropriate to the element type; 5188 5189 // Construct a loop over the array bounds, e.g., 5190 // 5191 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5192 // 5193 // that will copy each of the array elements. 5194 QualType SizeType = S.Context.getSizeType(); 5195 5196 // Create the iteration variable. 5197 IdentifierInfo *IterationVarName = 0; 5198 { 5199 llvm::SmallString<8> Str; 5200 llvm::raw_svector_ostream OS(Str); 5201 OS << "__i" << Depth; 5202 IterationVarName = &S.Context.Idents.get(OS.str()); 5203 } 5204 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5205 IterationVarName, SizeType, 5206 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5207 SC_None, SC_None); 5208 5209 // Initialize the iteration variable to zero. 5210 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5211 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5212 5213 // Create a reference to the iteration variable; we'll use this several 5214 // times throughout. 5215 Expr *IterationVarRef 5216 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5217 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5218 5219 // Create the DeclStmt that holds the iteration variable. 5220 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5221 5222 // Create the comparison against the array bound. 5223 llvm::APInt Upper 5224 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5225 Expr *Comparison 5226 = new (S.Context) BinaryOperator(IterationVarRef, 5227 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5228 BO_NE, S.Context.BoolTy, 5229 VK_RValue, OK_Ordinary, Loc); 5230 5231 // Create the pre-increment of the iteration variable. 5232 Expr *Increment 5233 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5234 VK_LValue, OK_Ordinary, Loc); 5235 5236 // Subscript the "from" and "to" expressions with the iteration variable. 5237 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5238 IterationVarRef, Loc)); 5239 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5240 IterationVarRef, Loc)); 5241 5242 // Build the copy for an individual element of the array. 5243 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5244 To, From, CopyingBaseSubobject, 5245 Depth + 1); 5246 if (Copy.isInvalid()) 5247 return StmtError(); 5248 5249 // Construct the loop that copies all elements of this array. 5250 return S.ActOnForStmt(Loc, Loc, InitStmt, 5251 S.MakeFullExpr(Comparison), 5252 0, S.MakeFullExpr(Increment), 5253 Loc, Copy.take()); 5254} 5255 5256/// \brief Determine whether the given class has a copy assignment operator 5257/// that accepts a const-qualified argument. 5258static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5259 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5260 5261 if (!Class->hasDeclaredCopyAssignment()) 5262 S.DeclareImplicitCopyAssignment(Class); 5263 5264 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5265 DeclarationName OpName 5266 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5267 5268 DeclContext::lookup_const_iterator Op, OpEnd; 5269 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5270 // C++ [class.copy]p9: 5271 // A user-declared copy assignment operator is a non-static non-template 5272 // member function of class X with exactly one parameter of type X, X&, 5273 // const X&, volatile X& or const volatile X&. 5274 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5275 if (!Method) 5276 continue; 5277 5278 if (Method->isStatic()) 5279 continue; 5280 if (Method->getPrimaryTemplate()) 5281 continue; 5282 const FunctionProtoType *FnType = 5283 Method->getType()->getAs<FunctionProtoType>(); 5284 assert(FnType && "Overloaded operator has no prototype."); 5285 // Don't assert on this; an invalid decl might have been left in the AST. 5286 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5287 continue; 5288 bool AcceptsConst = true; 5289 QualType ArgType = FnType->getArgType(0); 5290 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5291 ArgType = Ref->getPointeeType(); 5292 // Is it a non-const lvalue reference? 5293 if (!ArgType.isConstQualified()) 5294 AcceptsConst = false; 5295 } 5296 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5297 continue; 5298 5299 // We have a single argument of type cv X or cv X&, i.e. we've found the 5300 // copy assignment operator. Return whether it accepts const arguments. 5301 return AcceptsConst; 5302 } 5303 assert(Class->isInvalidDecl() && 5304 "No copy assignment operator declared in valid code."); 5305 return false; 5306} 5307 5308CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5309 // Note: The following rules are largely analoguous to the copy 5310 // constructor rules. Note that virtual bases are not taken into account 5311 // for determining the argument type of the operator. Note also that 5312 // operators taking an object instead of a reference are allowed. 5313 5314 5315 // C++ [class.copy]p10: 5316 // If the class definition does not explicitly declare a copy 5317 // assignment operator, one is declared implicitly. 5318 // The implicitly-defined copy assignment operator for a class X 5319 // will have the form 5320 // 5321 // X& X::operator=(const X&) 5322 // 5323 // if 5324 bool HasConstCopyAssignment = true; 5325 5326 // -- each direct base class B of X has a copy assignment operator 5327 // whose parameter is of type const B&, const volatile B& or B, 5328 // and 5329 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5330 BaseEnd = ClassDecl->bases_end(); 5331 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5332 assert(!Base->getType()->isDependentType() && 5333 "Cannot generate implicit members for class with dependent bases."); 5334 const CXXRecordDecl *BaseClassDecl 5335 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5336 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5337 } 5338 5339 // -- for all the nonstatic data members of X that are of a class 5340 // type M (or array thereof), each such class type has a copy 5341 // assignment operator whose parameter is of type const M&, 5342 // const volatile M& or M. 5343 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5344 FieldEnd = ClassDecl->field_end(); 5345 HasConstCopyAssignment && Field != FieldEnd; 5346 ++Field) { 5347 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5348 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5349 const CXXRecordDecl *FieldClassDecl 5350 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5351 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5352 } 5353 } 5354 5355 // Otherwise, the implicitly declared copy assignment operator will 5356 // have the form 5357 // 5358 // X& X::operator=(X&) 5359 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5360 QualType RetType = Context.getLValueReferenceType(ArgType); 5361 if (HasConstCopyAssignment) 5362 ArgType = ArgType.withConst(); 5363 ArgType = Context.getLValueReferenceType(ArgType); 5364 5365 // C++ [except.spec]p14: 5366 // An implicitly declared special member function (Clause 12) shall have an 5367 // exception-specification. [...] 5368 ImplicitExceptionSpecification ExceptSpec(Context); 5369 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5370 BaseEnd = ClassDecl->bases_end(); 5371 Base != BaseEnd; ++Base) { 5372 CXXRecordDecl *BaseClassDecl 5373 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5374 5375 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5376 DeclareImplicitCopyAssignment(BaseClassDecl); 5377 5378 if (CXXMethodDecl *CopyAssign 5379 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5380 ExceptSpec.CalledDecl(CopyAssign); 5381 } 5382 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5383 FieldEnd = ClassDecl->field_end(); 5384 Field != FieldEnd; 5385 ++Field) { 5386 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5387 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5388 CXXRecordDecl *FieldClassDecl 5389 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5390 5391 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5392 DeclareImplicitCopyAssignment(FieldClassDecl); 5393 5394 if (CXXMethodDecl *CopyAssign 5395 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5396 ExceptSpec.CalledDecl(CopyAssign); 5397 } 5398 } 5399 5400 // An implicitly-declared copy assignment operator is an inline public 5401 // member of its class. 5402 FunctionProtoType::ExtProtoInfo EPI; 5403 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 5404 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 5405 EST_None; 5406 EPI.NumExceptions = ExceptSpec.size(); 5407 EPI.Exceptions = ExceptSpec.data(); 5408 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5409 SourceLocation ClassLoc = ClassDecl->getLocation(); 5410 DeclarationNameInfo NameInfo(Name, ClassLoc); 5411 CXXMethodDecl *CopyAssignment 5412 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5413 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5414 /*TInfo=*/0, /*isStatic=*/false, 5415 /*StorageClassAsWritten=*/SC_None, 5416 /*isInline=*/true, 5417 SourceLocation()); 5418 CopyAssignment->setAccess(AS_public); 5419 CopyAssignment->setImplicit(); 5420 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5421 5422 // Add the parameter to the operator. 5423 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5424 ClassLoc, ClassLoc, /*Id=*/0, 5425 ArgType, /*TInfo=*/0, 5426 SC_None, 5427 SC_None, 0); 5428 CopyAssignment->setParams(&FromParam, 1); 5429 5430 // Note that we have added this copy-assignment operator. 5431 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5432 5433 if (Scope *S = getScopeForContext(ClassDecl)) 5434 PushOnScopeChains(CopyAssignment, S, false); 5435 ClassDecl->addDecl(CopyAssignment); 5436 5437 AddOverriddenMethods(ClassDecl, CopyAssignment); 5438 return CopyAssignment; 5439} 5440 5441void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5442 CXXMethodDecl *CopyAssignOperator) { 5443 assert((CopyAssignOperator->isImplicit() && 5444 CopyAssignOperator->isOverloadedOperator() && 5445 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5446 !CopyAssignOperator->isUsed(false)) && 5447 "DefineImplicitCopyAssignment called for wrong function"); 5448 5449 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5450 5451 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5452 CopyAssignOperator->setInvalidDecl(); 5453 return; 5454 } 5455 5456 CopyAssignOperator->setUsed(); 5457 5458 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5459 DiagnosticErrorTrap Trap(Diags); 5460 5461 // C++0x [class.copy]p30: 5462 // The implicitly-defined or explicitly-defaulted copy assignment operator 5463 // for a non-union class X performs memberwise copy assignment of its 5464 // subobjects. The direct base classes of X are assigned first, in the 5465 // order of their declaration in the base-specifier-list, and then the 5466 // immediate non-static data members of X are assigned, in the order in 5467 // which they were declared in the class definition. 5468 5469 // The statements that form the synthesized function body. 5470 ASTOwningVector<Stmt*> Statements(*this); 5471 5472 // The parameter for the "other" object, which we are copying from. 5473 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5474 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5475 QualType OtherRefType = Other->getType(); 5476 if (const LValueReferenceType *OtherRef 5477 = OtherRefType->getAs<LValueReferenceType>()) { 5478 OtherRefType = OtherRef->getPointeeType(); 5479 OtherQuals = OtherRefType.getQualifiers(); 5480 } 5481 5482 // Our location for everything implicitly-generated. 5483 SourceLocation Loc = CopyAssignOperator->getLocation(); 5484 5485 // Construct a reference to the "other" object. We'll be using this 5486 // throughout the generated ASTs. 5487 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5488 assert(OtherRef && "Reference to parameter cannot fail!"); 5489 5490 // Construct the "this" pointer. We'll be using this throughout the generated 5491 // ASTs. 5492 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5493 assert(This && "Reference to this cannot fail!"); 5494 5495 // Assign base classes. 5496 bool Invalid = false; 5497 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5498 E = ClassDecl->bases_end(); Base != E; ++Base) { 5499 // Form the assignment: 5500 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5501 QualType BaseType = Base->getType().getUnqualifiedType(); 5502 if (!BaseType->isRecordType()) { 5503 Invalid = true; 5504 continue; 5505 } 5506 5507 CXXCastPath BasePath; 5508 BasePath.push_back(Base); 5509 5510 // Construct the "from" expression, which is an implicit cast to the 5511 // appropriately-qualified base type. 5512 Expr *From = OtherRef; 5513 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5514 CK_UncheckedDerivedToBase, 5515 VK_LValue, &BasePath); 5516 5517 // Dereference "this". 5518 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5519 5520 // Implicitly cast "this" to the appropriately-qualified base type. 5521 Expr *ToE = To.takeAs<Expr>(); 5522 ImpCastExprToType(ToE, 5523 Context.getCVRQualifiedType(BaseType, 5524 CopyAssignOperator->getTypeQualifiers()), 5525 CK_UncheckedDerivedToBase, 5526 VK_LValue, &BasePath); 5527 To = Owned(ToE); 5528 5529 // Build the copy. 5530 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5531 To.get(), From, 5532 /*CopyingBaseSubobject=*/true); 5533 if (Copy.isInvalid()) { 5534 Diag(CurrentLocation, diag::note_member_synthesized_at) 5535 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5536 CopyAssignOperator->setInvalidDecl(); 5537 return; 5538 } 5539 5540 // Success! Record the copy. 5541 Statements.push_back(Copy.takeAs<Expr>()); 5542 } 5543 5544 // \brief Reference to the __builtin_memcpy function. 5545 Expr *BuiltinMemCpyRef = 0; 5546 // \brief Reference to the __builtin_objc_memmove_collectable function. 5547 Expr *CollectableMemCpyRef = 0; 5548 5549 // Assign non-static members. 5550 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5551 FieldEnd = ClassDecl->field_end(); 5552 Field != FieldEnd; ++Field) { 5553 // Check for members of reference type; we can't copy those. 5554 if (Field->getType()->isReferenceType()) { 5555 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5556 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5557 Diag(Field->getLocation(), diag::note_declared_at); 5558 Diag(CurrentLocation, diag::note_member_synthesized_at) 5559 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5560 Invalid = true; 5561 continue; 5562 } 5563 5564 // Check for members of const-qualified, non-class type. 5565 QualType BaseType = Context.getBaseElementType(Field->getType()); 5566 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5567 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5568 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5569 Diag(Field->getLocation(), diag::note_declared_at); 5570 Diag(CurrentLocation, diag::note_member_synthesized_at) 5571 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5572 Invalid = true; 5573 continue; 5574 } 5575 5576 QualType FieldType = Field->getType().getNonReferenceType(); 5577 if (FieldType->isIncompleteArrayType()) { 5578 assert(ClassDecl->hasFlexibleArrayMember() && 5579 "Incomplete array type is not valid"); 5580 continue; 5581 } 5582 5583 // Build references to the field in the object we're copying from and to. 5584 CXXScopeSpec SS; // Intentionally empty 5585 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5586 LookupMemberName); 5587 MemberLookup.addDecl(*Field); 5588 MemberLookup.resolveKind(); 5589 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5590 Loc, /*IsArrow=*/false, 5591 SS, 0, MemberLookup, 0); 5592 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5593 Loc, /*IsArrow=*/true, 5594 SS, 0, MemberLookup, 0); 5595 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5596 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5597 5598 // If the field should be copied with __builtin_memcpy rather than via 5599 // explicit assignments, do so. This optimization only applies for arrays 5600 // of scalars and arrays of class type with trivial copy-assignment 5601 // operators. 5602 if (FieldType->isArrayType() && 5603 (!BaseType->isRecordType() || 5604 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5605 ->hasTrivialCopyAssignment())) { 5606 // Compute the size of the memory buffer to be copied. 5607 QualType SizeType = Context.getSizeType(); 5608 llvm::APInt Size(Context.getTypeSize(SizeType), 5609 Context.getTypeSizeInChars(BaseType).getQuantity()); 5610 for (const ConstantArrayType *Array 5611 = Context.getAsConstantArrayType(FieldType); 5612 Array; 5613 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5614 llvm::APInt ArraySize 5615 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5616 Size *= ArraySize; 5617 } 5618 5619 // Take the address of the field references for "from" and "to". 5620 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5621 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5622 5623 bool NeedsCollectableMemCpy = 5624 (BaseType->isRecordType() && 5625 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5626 5627 if (NeedsCollectableMemCpy) { 5628 if (!CollectableMemCpyRef) { 5629 // Create a reference to the __builtin_objc_memmove_collectable function. 5630 LookupResult R(*this, 5631 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5632 Loc, LookupOrdinaryName); 5633 LookupName(R, TUScope, true); 5634 5635 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5636 if (!CollectableMemCpy) { 5637 // Something went horribly wrong earlier, and we will have 5638 // complained about it. 5639 Invalid = true; 5640 continue; 5641 } 5642 5643 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5644 CollectableMemCpy->getType(), 5645 VK_LValue, Loc, 0).take(); 5646 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5647 } 5648 } 5649 // Create a reference to the __builtin_memcpy builtin function. 5650 else if (!BuiltinMemCpyRef) { 5651 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5652 LookupOrdinaryName); 5653 LookupName(R, TUScope, true); 5654 5655 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5656 if (!BuiltinMemCpy) { 5657 // Something went horribly wrong earlier, and we will have complained 5658 // about it. 5659 Invalid = true; 5660 continue; 5661 } 5662 5663 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5664 BuiltinMemCpy->getType(), 5665 VK_LValue, Loc, 0).take(); 5666 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5667 } 5668 5669 ASTOwningVector<Expr*> CallArgs(*this); 5670 CallArgs.push_back(To.takeAs<Expr>()); 5671 CallArgs.push_back(From.takeAs<Expr>()); 5672 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5673 ExprResult Call = ExprError(); 5674 if (NeedsCollectableMemCpy) 5675 Call = ActOnCallExpr(/*Scope=*/0, 5676 CollectableMemCpyRef, 5677 Loc, move_arg(CallArgs), 5678 Loc); 5679 else 5680 Call = ActOnCallExpr(/*Scope=*/0, 5681 BuiltinMemCpyRef, 5682 Loc, move_arg(CallArgs), 5683 Loc); 5684 5685 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5686 Statements.push_back(Call.takeAs<Expr>()); 5687 continue; 5688 } 5689 5690 // Build the copy of this field. 5691 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5692 To.get(), From.get(), 5693 /*CopyingBaseSubobject=*/false); 5694 if (Copy.isInvalid()) { 5695 Diag(CurrentLocation, diag::note_member_synthesized_at) 5696 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5697 CopyAssignOperator->setInvalidDecl(); 5698 return; 5699 } 5700 5701 // Success! Record the copy. 5702 Statements.push_back(Copy.takeAs<Stmt>()); 5703 } 5704 5705 if (!Invalid) { 5706 // Add a "return *this;" 5707 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5708 5709 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5710 if (Return.isInvalid()) 5711 Invalid = true; 5712 else { 5713 Statements.push_back(Return.takeAs<Stmt>()); 5714 5715 if (Trap.hasErrorOccurred()) { 5716 Diag(CurrentLocation, diag::note_member_synthesized_at) 5717 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5718 Invalid = true; 5719 } 5720 } 5721 } 5722 5723 if (Invalid) { 5724 CopyAssignOperator->setInvalidDecl(); 5725 return; 5726 } 5727 5728 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5729 /*isStmtExpr=*/false); 5730 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5731 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5732} 5733 5734CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5735 CXXRecordDecl *ClassDecl) { 5736 // C++ [class.copy]p4: 5737 // If the class definition does not explicitly declare a copy 5738 // constructor, one is declared implicitly. 5739 5740 // C++ [class.copy]p5: 5741 // The implicitly-declared copy constructor for a class X will 5742 // have the form 5743 // 5744 // X::X(const X&) 5745 // 5746 // if 5747 bool HasConstCopyConstructor = true; 5748 5749 // -- each direct or virtual base class B of X has a copy 5750 // constructor whose first parameter is of type const B& or 5751 // const volatile B&, and 5752 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5753 BaseEnd = ClassDecl->bases_end(); 5754 HasConstCopyConstructor && Base != BaseEnd; 5755 ++Base) { 5756 // Virtual bases are handled below. 5757 if (Base->isVirtual()) 5758 continue; 5759 5760 CXXRecordDecl *BaseClassDecl 5761 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5762 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5763 DeclareImplicitCopyConstructor(BaseClassDecl); 5764 5765 HasConstCopyConstructor 5766 = BaseClassDecl->hasConstCopyConstructor(Context); 5767 } 5768 5769 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5770 BaseEnd = ClassDecl->vbases_end(); 5771 HasConstCopyConstructor && Base != BaseEnd; 5772 ++Base) { 5773 CXXRecordDecl *BaseClassDecl 5774 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5775 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5776 DeclareImplicitCopyConstructor(BaseClassDecl); 5777 5778 HasConstCopyConstructor 5779 = BaseClassDecl->hasConstCopyConstructor(Context); 5780 } 5781 5782 // -- for all the nonstatic data members of X that are of a 5783 // class type M (or array thereof), each such class type 5784 // has a copy constructor whose first parameter is of type 5785 // const M& or const volatile M&. 5786 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5787 FieldEnd = ClassDecl->field_end(); 5788 HasConstCopyConstructor && Field != FieldEnd; 5789 ++Field) { 5790 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5791 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5792 CXXRecordDecl *FieldClassDecl 5793 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5794 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5795 DeclareImplicitCopyConstructor(FieldClassDecl); 5796 5797 HasConstCopyConstructor 5798 = FieldClassDecl->hasConstCopyConstructor(Context); 5799 } 5800 } 5801 5802 // Otherwise, the implicitly declared copy constructor will have 5803 // the form 5804 // 5805 // X::X(X&) 5806 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5807 QualType ArgType = ClassType; 5808 if (HasConstCopyConstructor) 5809 ArgType = ArgType.withConst(); 5810 ArgType = Context.getLValueReferenceType(ArgType); 5811 5812 // C++ [except.spec]p14: 5813 // An implicitly declared special member function (Clause 12) shall have an 5814 // exception-specification. [...] 5815 ImplicitExceptionSpecification ExceptSpec(Context); 5816 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5817 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5818 BaseEnd = ClassDecl->bases_end(); 5819 Base != BaseEnd; 5820 ++Base) { 5821 // Virtual bases are handled below. 5822 if (Base->isVirtual()) 5823 continue; 5824 5825 CXXRecordDecl *BaseClassDecl 5826 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5827 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5828 DeclareImplicitCopyConstructor(BaseClassDecl); 5829 5830 if (CXXConstructorDecl *CopyConstructor 5831 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5832 ExceptSpec.CalledDecl(CopyConstructor); 5833 } 5834 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5835 BaseEnd = ClassDecl->vbases_end(); 5836 Base != BaseEnd; 5837 ++Base) { 5838 CXXRecordDecl *BaseClassDecl 5839 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5840 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5841 DeclareImplicitCopyConstructor(BaseClassDecl); 5842 5843 if (CXXConstructorDecl *CopyConstructor 5844 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5845 ExceptSpec.CalledDecl(CopyConstructor); 5846 } 5847 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5848 FieldEnd = ClassDecl->field_end(); 5849 Field != FieldEnd; 5850 ++Field) { 5851 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5852 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5853 CXXRecordDecl *FieldClassDecl 5854 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5855 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5856 DeclareImplicitCopyConstructor(FieldClassDecl); 5857 5858 if (CXXConstructorDecl *CopyConstructor 5859 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5860 ExceptSpec.CalledDecl(CopyConstructor); 5861 } 5862 } 5863 5864 // An implicitly-declared copy constructor is an inline public 5865 // member of its class. 5866 FunctionProtoType::ExtProtoInfo EPI; 5867 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 5868 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 5869 EST_None; 5870 EPI.NumExceptions = ExceptSpec.size(); 5871 EPI.Exceptions = ExceptSpec.data(); 5872 DeclarationName Name 5873 = Context.DeclarationNames.getCXXConstructorName( 5874 Context.getCanonicalType(ClassType)); 5875 SourceLocation ClassLoc = ClassDecl->getLocation(); 5876 DeclarationNameInfo NameInfo(Name, ClassLoc); 5877 CXXConstructorDecl *CopyConstructor 5878 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5879 Context.getFunctionType(Context.VoidTy, 5880 &ArgType, 1, EPI), 5881 /*TInfo=*/0, 5882 /*isExplicit=*/false, 5883 /*isInline=*/true, 5884 /*isImplicitlyDeclared=*/true); 5885 CopyConstructor->setAccess(AS_public); 5886 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5887 5888 // Note that we have declared this constructor. 5889 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5890 5891 // Add the parameter to the constructor. 5892 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5893 ClassLoc, ClassLoc, 5894 /*IdentifierInfo=*/0, 5895 ArgType, /*TInfo=*/0, 5896 SC_None, 5897 SC_None, 0); 5898 CopyConstructor->setParams(&FromParam, 1); 5899 if (Scope *S = getScopeForContext(ClassDecl)) 5900 PushOnScopeChains(CopyConstructor, S, false); 5901 ClassDecl->addDecl(CopyConstructor); 5902 5903 return CopyConstructor; 5904} 5905 5906void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5907 CXXConstructorDecl *CopyConstructor, 5908 unsigned TypeQuals) { 5909 assert((CopyConstructor->isImplicit() && 5910 CopyConstructor->isCopyConstructor(TypeQuals) && 5911 !CopyConstructor->isUsed(false)) && 5912 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5913 5914 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5915 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5916 5917 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5918 DiagnosticErrorTrap Trap(Diags); 5919 5920 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5921 Trap.hasErrorOccurred()) { 5922 Diag(CurrentLocation, diag::note_member_synthesized_at) 5923 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5924 CopyConstructor->setInvalidDecl(); 5925 } else { 5926 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5927 CopyConstructor->getLocation(), 5928 MultiStmtArg(*this, 0, 0), 5929 /*isStmtExpr=*/false) 5930 .takeAs<Stmt>()); 5931 } 5932 5933 CopyConstructor->setUsed(); 5934} 5935 5936ExprResult 5937Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5938 CXXConstructorDecl *Constructor, 5939 MultiExprArg ExprArgs, 5940 bool RequiresZeroInit, 5941 unsigned ConstructKind, 5942 SourceRange ParenRange) { 5943 bool Elidable = false; 5944 5945 // C++0x [class.copy]p34: 5946 // When certain criteria are met, an implementation is allowed to 5947 // omit the copy/move construction of a class object, even if the 5948 // copy/move constructor and/or destructor for the object have 5949 // side effects. [...] 5950 // - when a temporary class object that has not been bound to a 5951 // reference (12.2) would be copied/moved to a class object 5952 // with the same cv-unqualified type, the copy/move operation 5953 // can be omitted by constructing the temporary object 5954 // directly into the target of the omitted copy/move 5955 if (ConstructKind == CXXConstructExpr::CK_Complete && 5956 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5957 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5958 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5959 } 5960 5961 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5962 Elidable, move(ExprArgs), RequiresZeroInit, 5963 ConstructKind, ParenRange); 5964} 5965 5966/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5967/// including handling of its default argument expressions. 5968ExprResult 5969Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5970 CXXConstructorDecl *Constructor, bool Elidable, 5971 MultiExprArg ExprArgs, 5972 bool RequiresZeroInit, 5973 unsigned ConstructKind, 5974 SourceRange ParenRange) { 5975 unsigned NumExprs = ExprArgs.size(); 5976 Expr **Exprs = (Expr **)ExprArgs.release(); 5977 5978 MarkDeclarationReferenced(ConstructLoc, Constructor); 5979 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5980 Constructor, Elidable, Exprs, NumExprs, 5981 RequiresZeroInit, 5982 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5983 ParenRange)); 5984} 5985 5986bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5987 CXXConstructorDecl *Constructor, 5988 MultiExprArg Exprs) { 5989 // FIXME: Provide the correct paren SourceRange when available. 5990 ExprResult TempResult = 5991 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5992 move(Exprs), false, CXXConstructExpr::CK_Complete, 5993 SourceRange()); 5994 if (TempResult.isInvalid()) 5995 return true; 5996 5997 Expr *Temp = TempResult.takeAs<Expr>(); 5998 CheckImplicitConversions(Temp, VD->getLocation()); 5999 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6000 Temp = MaybeCreateExprWithCleanups(Temp); 6001 VD->setInit(Temp); 6002 6003 return false; 6004} 6005 6006void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6007 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6008 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 6009 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 6010 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6011 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6012 CheckDestructorAccess(VD->getLocation(), Destructor, 6013 PDiag(diag::err_access_dtor_var) 6014 << VD->getDeclName() 6015 << VD->getType()); 6016 6017 // TODO: this should be re-enabled for static locals by !CXAAtExit 6018 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 6019 Diag(VD->getLocation(), diag::warn_global_destructor); 6020 } 6021} 6022 6023/// AddCXXDirectInitializerToDecl - This action is called immediately after 6024/// ActOnDeclarator, when a C++ direct initializer is present. 6025/// e.g: "int x(1);" 6026void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6027 SourceLocation LParenLoc, 6028 MultiExprArg Exprs, 6029 SourceLocation RParenLoc, 6030 bool TypeMayContainAuto) { 6031 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6032 6033 // If there is no declaration, there was an error parsing it. Just ignore 6034 // the initializer. 6035 if (RealDecl == 0) 6036 return; 6037 6038 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6039 if (!VDecl) { 6040 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6041 RealDecl->setInvalidDecl(); 6042 return; 6043 } 6044 6045 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6046 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6047 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6048 if (Exprs.size() > 1) { 6049 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6050 diag::err_auto_var_init_multiple_expressions) 6051 << VDecl->getDeclName() << VDecl->getType() 6052 << VDecl->getSourceRange(); 6053 RealDecl->setInvalidDecl(); 6054 return; 6055 } 6056 6057 Expr *Init = Exprs.get()[0]; 6058 QualType DeducedType; 6059 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 6060 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6061 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6062 << Init->getSourceRange(); 6063 RealDecl->setInvalidDecl(); 6064 return; 6065 } 6066 VDecl->setType(DeducedType); 6067 6068 // If this is a redeclaration, check that the type we just deduced matches 6069 // the previously declared type. 6070 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6071 MergeVarDeclTypes(VDecl, Old); 6072 } 6073 6074 // We will represent direct-initialization similarly to copy-initialization: 6075 // int x(1); -as-> int x = 1; 6076 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6077 // 6078 // Clients that want to distinguish between the two forms, can check for 6079 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6080 // A major benefit is that clients that don't particularly care about which 6081 // exactly form was it (like the CodeGen) can handle both cases without 6082 // special case code. 6083 6084 // C++ 8.5p11: 6085 // The form of initialization (using parentheses or '=') is generally 6086 // insignificant, but does matter when the entity being initialized has a 6087 // class type. 6088 6089 if (!VDecl->getType()->isDependentType() && 6090 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6091 diag::err_typecheck_decl_incomplete_type)) { 6092 VDecl->setInvalidDecl(); 6093 return; 6094 } 6095 6096 // The variable can not have an abstract class type. 6097 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6098 diag::err_abstract_type_in_decl, 6099 AbstractVariableType)) 6100 VDecl->setInvalidDecl(); 6101 6102 const VarDecl *Def; 6103 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6104 Diag(VDecl->getLocation(), diag::err_redefinition) 6105 << VDecl->getDeclName(); 6106 Diag(Def->getLocation(), diag::note_previous_definition); 6107 VDecl->setInvalidDecl(); 6108 return; 6109 } 6110 6111 // C++ [class.static.data]p4 6112 // If a static data member is of const integral or const 6113 // enumeration type, its declaration in the class definition can 6114 // specify a constant-initializer which shall be an integral 6115 // constant expression (5.19). In that case, the member can appear 6116 // in integral constant expressions. The member shall still be 6117 // defined in a namespace scope if it is used in the program and the 6118 // namespace scope definition shall not contain an initializer. 6119 // 6120 // We already performed a redefinition check above, but for static 6121 // data members we also need to check whether there was an in-class 6122 // declaration with an initializer. 6123 const VarDecl* PrevInit = 0; 6124 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6125 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6126 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6127 return; 6128 } 6129 6130 bool IsDependent = false; 6131 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6132 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6133 VDecl->setInvalidDecl(); 6134 return; 6135 } 6136 6137 if (Exprs.get()[I]->isTypeDependent()) 6138 IsDependent = true; 6139 } 6140 6141 // If either the declaration has a dependent type or if any of the 6142 // expressions is type-dependent, we represent the initialization 6143 // via a ParenListExpr for later use during template instantiation. 6144 if (VDecl->getType()->isDependentType() || IsDependent) { 6145 // Let clients know that initialization was done with a direct initializer. 6146 VDecl->setCXXDirectInitializer(true); 6147 6148 // Store the initialization expressions as a ParenListExpr. 6149 unsigned NumExprs = Exprs.size(); 6150 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6151 (Expr **)Exprs.release(), 6152 NumExprs, RParenLoc)); 6153 return; 6154 } 6155 6156 // Capture the variable that is being initialized and the style of 6157 // initialization. 6158 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6159 6160 // FIXME: Poor source location information. 6161 InitializationKind Kind 6162 = InitializationKind::CreateDirect(VDecl->getLocation(), 6163 LParenLoc, RParenLoc); 6164 6165 InitializationSequence InitSeq(*this, Entity, Kind, 6166 Exprs.get(), Exprs.size()); 6167 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6168 if (Result.isInvalid()) { 6169 VDecl->setInvalidDecl(); 6170 return; 6171 } 6172 6173 CheckImplicitConversions(Result.get(), LParenLoc); 6174 6175 Result = MaybeCreateExprWithCleanups(Result); 6176 VDecl->setInit(Result.takeAs<Expr>()); 6177 VDecl->setCXXDirectInitializer(true); 6178 6179 CheckCompleteVariableDeclaration(VDecl); 6180} 6181 6182/// \brief Given a constructor and the set of arguments provided for the 6183/// constructor, convert the arguments and add any required default arguments 6184/// to form a proper call to this constructor. 6185/// 6186/// \returns true if an error occurred, false otherwise. 6187bool 6188Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6189 MultiExprArg ArgsPtr, 6190 SourceLocation Loc, 6191 ASTOwningVector<Expr*> &ConvertedArgs) { 6192 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6193 unsigned NumArgs = ArgsPtr.size(); 6194 Expr **Args = (Expr **)ArgsPtr.get(); 6195 6196 const FunctionProtoType *Proto 6197 = Constructor->getType()->getAs<FunctionProtoType>(); 6198 assert(Proto && "Constructor without a prototype?"); 6199 unsigned NumArgsInProto = Proto->getNumArgs(); 6200 6201 // If too few arguments are available, we'll fill in the rest with defaults. 6202 if (NumArgs < NumArgsInProto) 6203 ConvertedArgs.reserve(NumArgsInProto); 6204 else 6205 ConvertedArgs.reserve(NumArgs); 6206 6207 VariadicCallType CallType = 6208 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6209 llvm::SmallVector<Expr *, 8> AllArgs; 6210 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6211 Proto, 0, Args, NumArgs, AllArgs, 6212 CallType); 6213 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6214 ConvertedArgs.push_back(AllArgs[i]); 6215 return Invalid; 6216} 6217 6218static inline bool 6219CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6220 const FunctionDecl *FnDecl) { 6221 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6222 if (isa<NamespaceDecl>(DC)) { 6223 return SemaRef.Diag(FnDecl->getLocation(), 6224 diag::err_operator_new_delete_declared_in_namespace) 6225 << FnDecl->getDeclName(); 6226 } 6227 6228 if (isa<TranslationUnitDecl>(DC) && 6229 FnDecl->getStorageClass() == SC_Static) { 6230 return SemaRef.Diag(FnDecl->getLocation(), 6231 diag::err_operator_new_delete_declared_static) 6232 << FnDecl->getDeclName(); 6233 } 6234 6235 return false; 6236} 6237 6238static inline bool 6239CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6240 CanQualType ExpectedResultType, 6241 CanQualType ExpectedFirstParamType, 6242 unsigned DependentParamTypeDiag, 6243 unsigned InvalidParamTypeDiag) { 6244 QualType ResultType = 6245 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6246 6247 // Check that the result type is not dependent. 6248 if (ResultType->isDependentType()) 6249 return SemaRef.Diag(FnDecl->getLocation(), 6250 diag::err_operator_new_delete_dependent_result_type) 6251 << FnDecl->getDeclName() << ExpectedResultType; 6252 6253 // Check that the result type is what we expect. 6254 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6255 return SemaRef.Diag(FnDecl->getLocation(), 6256 diag::err_operator_new_delete_invalid_result_type) 6257 << FnDecl->getDeclName() << ExpectedResultType; 6258 6259 // A function template must have at least 2 parameters. 6260 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6261 return SemaRef.Diag(FnDecl->getLocation(), 6262 diag::err_operator_new_delete_template_too_few_parameters) 6263 << FnDecl->getDeclName(); 6264 6265 // The function decl must have at least 1 parameter. 6266 if (FnDecl->getNumParams() == 0) 6267 return SemaRef.Diag(FnDecl->getLocation(), 6268 diag::err_operator_new_delete_too_few_parameters) 6269 << FnDecl->getDeclName(); 6270 6271 // Check the the first parameter type is not dependent. 6272 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6273 if (FirstParamType->isDependentType()) 6274 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6275 << FnDecl->getDeclName() << ExpectedFirstParamType; 6276 6277 // Check that the first parameter type is what we expect. 6278 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6279 ExpectedFirstParamType) 6280 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6281 << FnDecl->getDeclName() << ExpectedFirstParamType; 6282 6283 return false; 6284} 6285 6286static bool 6287CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6288 // C++ [basic.stc.dynamic.allocation]p1: 6289 // A program is ill-formed if an allocation function is declared in a 6290 // namespace scope other than global scope or declared static in global 6291 // scope. 6292 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6293 return true; 6294 6295 CanQualType SizeTy = 6296 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6297 6298 // C++ [basic.stc.dynamic.allocation]p1: 6299 // The return type shall be void*. The first parameter shall have type 6300 // std::size_t. 6301 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6302 SizeTy, 6303 diag::err_operator_new_dependent_param_type, 6304 diag::err_operator_new_param_type)) 6305 return true; 6306 6307 // C++ [basic.stc.dynamic.allocation]p1: 6308 // The first parameter shall not have an associated default argument. 6309 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6310 return SemaRef.Diag(FnDecl->getLocation(), 6311 diag::err_operator_new_default_arg) 6312 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6313 6314 return false; 6315} 6316 6317static bool 6318CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6319 // C++ [basic.stc.dynamic.deallocation]p1: 6320 // A program is ill-formed if deallocation functions are declared in a 6321 // namespace scope other than global scope or declared static in global 6322 // scope. 6323 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6324 return true; 6325 6326 // C++ [basic.stc.dynamic.deallocation]p2: 6327 // Each deallocation function shall return void and its first parameter 6328 // shall be void*. 6329 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6330 SemaRef.Context.VoidPtrTy, 6331 diag::err_operator_delete_dependent_param_type, 6332 diag::err_operator_delete_param_type)) 6333 return true; 6334 6335 return false; 6336} 6337 6338/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6339/// of this overloaded operator is well-formed. If so, returns false; 6340/// otherwise, emits appropriate diagnostics and returns true. 6341bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6342 assert(FnDecl && FnDecl->isOverloadedOperator() && 6343 "Expected an overloaded operator declaration"); 6344 6345 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6346 6347 // C++ [over.oper]p5: 6348 // The allocation and deallocation functions, operator new, 6349 // operator new[], operator delete and operator delete[], are 6350 // described completely in 3.7.3. The attributes and restrictions 6351 // found in the rest of this subclause do not apply to them unless 6352 // explicitly stated in 3.7.3. 6353 if (Op == OO_Delete || Op == OO_Array_Delete) 6354 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6355 6356 if (Op == OO_New || Op == OO_Array_New) 6357 return CheckOperatorNewDeclaration(*this, FnDecl); 6358 6359 // C++ [over.oper]p6: 6360 // An operator function shall either be a non-static member 6361 // function or be a non-member function and have at least one 6362 // parameter whose type is a class, a reference to a class, an 6363 // enumeration, or a reference to an enumeration. 6364 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6365 if (MethodDecl->isStatic()) 6366 return Diag(FnDecl->getLocation(), 6367 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6368 } else { 6369 bool ClassOrEnumParam = false; 6370 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6371 ParamEnd = FnDecl->param_end(); 6372 Param != ParamEnd; ++Param) { 6373 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6374 if (ParamType->isDependentType() || ParamType->isRecordType() || 6375 ParamType->isEnumeralType()) { 6376 ClassOrEnumParam = true; 6377 break; 6378 } 6379 } 6380 6381 if (!ClassOrEnumParam) 6382 return Diag(FnDecl->getLocation(), 6383 diag::err_operator_overload_needs_class_or_enum) 6384 << FnDecl->getDeclName(); 6385 } 6386 6387 // C++ [over.oper]p8: 6388 // An operator function cannot have default arguments (8.3.6), 6389 // except where explicitly stated below. 6390 // 6391 // Only the function-call operator allows default arguments 6392 // (C++ [over.call]p1). 6393 if (Op != OO_Call) { 6394 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6395 Param != FnDecl->param_end(); ++Param) { 6396 if ((*Param)->hasDefaultArg()) 6397 return Diag((*Param)->getLocation(), 6398 diag::err_operator_overload_default_arg) 6399 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6400 } 6401 } 6402 6403 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6404 { false, false, false } 6405#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6406 , { Unary, Binary, MemberOnly } 6407#include "clang/Basic/OperatorKinds.def" 6408 }; 6409 6410 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6411 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6412 bool MustBeMemberOperator = OperatorUses[Op][2]; 6413 6414 // C++ [over.oper]p8: 6415 // [...] Operator functions cannot have more or fewer parameters 6416 // than the number required for the corresponding operator, as 6417 // described in the rest of this subclause. 6418 unsigned NumParams = FnDecl->getNumParams() 6419 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6420 if (Op != OO_Call && 6421 ((NumParams == 1 && !CanBeUnaryOperator) || 6422 (NumParams == 2 && !CanBeBinaryOperator) || 6423 (NumParams < 1) || (NumParams > 2))) { 6424 // We have the wrong number of parameters. 6425 unsigned ErrorKind; 6426 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6427 ErrorKind = 2; // 2 -> unary or binary. 6428 } else if (CanBeUnaryOperator) { 6429 ErrorKind = 0; // 0 -> unary 6430 } else { 6431 assert(CanBeBinaryOperator && 6432 "All non-call overloaded operators are unary or binary!"); 6433 ErrorKind = 1; // 1 -> binary 6434 } 6435 6436 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6437 << FnDecl->getDeclName() << NumParams << ErrorKind; 6438 } 6439 6440 // Overloaded operators other than operator() cannot be variadic. 6441 if (Op != OO_Call && 6442 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6443 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6444 << FnDecl->getDeclName(); 6445 } 6446 6447 // Some operators must be non-static member functions. 6448 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6449 return Diag(FnDecl->getLocation(), 6450 diag::err_operator_overload_must_be_member) 6451 << FnDecl->getDeclName(); 6452 } 6453 6454 // C++ [over.inc]p1: 6455 // The user-defined function called operator++ implements the 6456 // prefix and postfix ++ operator. If this function is a member 6457 // function with no parameters, or a non-member function with one 6458 // parameter of class or enumeration type, it defines the prefix 6459 // increment operator ++ for objects of that type. If the function 6460 // is a member function with one parameter (which shall be of type 6461 // int) or a non-member function with two parameters (the second 6462 // of which shall be of type int), it defines the postfix 6463 // increment operator ++ for objects of that type. 6464 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6465 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6466 bool ParamIsInt = false; 6467 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6468 ParamIsInt = BT->getKind() == BuiltinType::Int; 6469 6470 if (!ParamIsInt) 6471 return Diag(LastParam->getLocation(), 6472 diag::err_operator_overload_post_incdec_must_be_int) 6473 << LastParam->getType() << (Op == OO_MinusMinus); 6474 } 6475 6476 return false; 6477} 6478 6479/// CheckLiteralOperatorDeclaration - Check whether the declaration 6480/// of this literal operator function is well-formed. If so, returns 6481/// false; otherwise, emits appropriate diagnostics and returns true. 6482bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6483 DeclContext *DC = FnDecl->getDeclContext(); 6484 Decl::Kind Kind = DC->getDeclKind(); 6485 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6486 Kind != Decl::LinkageSpec) { 6487 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6488 << FnDecl->getDeclName(); 6489 return true; 6490 } 6491 6492 bool Valid = false; 6493 6494 // template <char...> type operator "" name() is the only valid template 6495 // signature, and the only valid signature with no parameters. 6496 if (FnDecl->param_size() == 0) { 6497 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6498 // Must have only one template parameter 6499 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6500 if (Params->size() == 1) { 6501 NonTypeTemplateParmDecl *PmDecl = 6502 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6503 6504 // The template parameter must be a char parameter pack. 6505 if (PmDecl && PmDecl->isTemplateParameterPack() && 6506 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6507 Valid = true; 6508 } 6509 } 6510 } else { 6511 // Check the first parameter 6512 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6513 6514 QualType T = (*Param)->getType(); 6515 6516 // unsigned long long int, long double, and any character type are allowed 6517 // as the only parameters. 6518 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6519 Context.hasSameType(T, Context.LongDoubleTy) || 6520 Context.hasSameType(T, Context.CharTy) || 6521 Context.hasSameType(T, Context.WCharTy) || 6522 Context.hasSameType(T, Context.Char16Ty) || 6523 Context.hasSameType(T, Context.Char32Ty)) { 6524 if (++Param == FnDecl->param_end()) 6525 Valid = true; 6526 goto FinishedParams; 6527 } 6528 6529 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6530 const PointerType *PT = T->getAs<PointerType>(); 6531 if (!PT) 6532 goto FinishedParams; 6533 T = PT->getPointeeType(); 6534 if (!T.isConstQualified()) 6535 goto FinishedParams; 6536 T = T.getUnqualifiedType(); 6537 6538 // Move on to the second parameter; 6539 ++Param; 6540 6541 // If there is no second parameter, the first must be a const char * 6542 if (Param == FnDecl->param_end()) { 6543 if (Context.hasSameType(T, Context.CharTy)) 6544 Valid = true; 6545 goto FinishedParams; 6546 } 6547 6548 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6549 // are allowed as the first parameter to a two-parameter function 6550 if (!(Context.hasSameType(T, Context.CharTy) || 6551 Context.hasSameType(T, Context.WCharTy) || 6552 Context.hasSameType(T, Context.Char16Ty) || 6553 Context.hasSameType(T, Context.Char32Ty))) 6554 goto FinishedParams; 6555 6556 // The second and final parameter must be an std::size_t 6557 T = (*Param)->getType().getUnqualifiedType(); 6558 if (Context.hasSameType(T, Context.getSizeType()) && 6559 ++Param == FnDecl->param_end()) 6560 Valid = true; 6561 } 6562 6563 // FIXME: This diagnostic is absolutely terrible. 6564FinishedParams: 6565 if (!Valid) { 6566 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6567 << FnDecl->getDeclName(); 6568 return true; 6569 } 6570 6571 return false; 6572} 6573 6574/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6575/// linkage specification, including the language and (if present) 6576/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6577/// the location of the language string literal, which is provided 6578/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6579/// the '{' brace. Otherwise, this linkage specification does not 6580/// have any braces. 6581Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6582 SourceLocation LangLoc, 6583 llvm::StringRef Lang, 6584 SourceLocation LBraceLoc) { 6585 LinkageSpecDecl::LanguageIDs Language; 6586 if (Lang == "\"C\"") 6587 Language = LinkageSpecDecl::lang_c; 6588 else if (Lang == "\"C++\"") 6589 Language = LinkageSpecDecl::lang_cxx; 6590 else { 6591 Diag(LangLoc, diag::err_bad_language); 6592 return 0; 6593 } 6594 6595 // FIXME: Add all the various semantics of linkage specifications 6596 6597 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6598 ExternLoc, LangLoc, Language); 6599 CurContext->addDecl(D); 6600 PushDeclContext(S, D); 6601 return D; 6602} 6603 6604/// ActOnFinishLinkageSpecification - Complete the definition of 6605/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6606/// valid, it's the position of the closing '}' brace in a linkage 6607/// specification that uses braces. 6608Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6609 Decl *LinkageSpec, 6610 SourceLocation RBraceLoc) { 6611 if (LinkageSpec) { 6612 if (RBraceLoc.isValid()) { 6613 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6614 LSDecl->setRBraceLoc(RBraceLoc); 6615 } 6616 PopDeclContext(); 6617 } 6618 return LinkageSpec; 6619} 6620 6621/// \brief Perform semantic analysis for the variable declaration that 6622/// occurs within a C++ catch clause, returning the newly-created 6623/// variable. 6624VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6625 TypeSourceInfo *TInfo, 6626 SourceLocation StartLoc, 6627 SourceLocation Loc, 6628 IdentifierInfo *Name) { 6629 bool Invalid = false; 6630 QualType ExDeclType = TInfo->getType(); 6631 6632 // Arrays and functions decay. 6633 if (ExDeclType->isArrayType()) 6634 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6635 else if (ExDeclType->isFunctionType()) 6636 ExDeclType = Context.getPointerType(ExDeclType); 6637 6638 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6639 // The exception-declaration shall not denote a pointer or reference to an 6640 // incomplete type, other than [cv] void*. 6641 // N2844 forbids rvalue references. 6642 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6643 Diag(Loc, diag::err_catch_rvalue_ref); 6644 Invalid = true; 6645 } 6646 6647 // GCC allows catching pointers and references to incomplete types 6648 // as an extension; so do we, but we warn by default. 6649 6650 QualType BaseType = ExDeclType; 6651 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6652 unsigned DK = diag::err_catch_incomplete; 6653 bool IncompleteCatchIsInvalid = true; 6654 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6655 BaseType = Ptr->getPointeeType(); 6656 Mode = 1; 6657 DK = diag::ext_catch_incomplete_ptr; 6658 IncompleteCatchIsInvalid = false; 6659 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6660 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6661 BaseType = Ref->getPointeeType(); 6662 Mode = 2; 6663 DK = diag::ext_catch_incomplete_ref; 6664 IncompleteCatchIsInvalid = false; 6665 } 6666 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6667 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6668 IncompleteCatchIsInvalid) 6669 Invalid = true; 6670 6671 if (!Invalid && !ExDeclType->isDependentType() && 6672 RequireNonAbstractType(Loc, ExDeclType, 6673 diag::err_abstract_type_in_decl, 6674 AbstractVariableType)) 6675 Invalid = true; 6676 6677 // Only the non-fragile NeXT runtime currently supports C++ catches 6678 // of ObjC types, and no runtime supports catching ObjC types by value. 6679 if (!Invalid && getLangOptions().ObjC1) { 6680 QualType T = ExDeclType; 6681 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6682 T = RT->getPointeeType(); 6683 6684 if (T->isObjCObjectType()) { 6685 Diag(Loc, diag::err_objc_object_catch); 6686 Invalid = true; 6687 } else if (T->isObjCObjectPointerType()) { 6688 if (!getLangOptions().NeXTRuntime) { 6689 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6690 Invalid = true; 6691 } else if (!getLangOptions().ObjCNonFragileABI) { 6692 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6693 Invalid = true; 6694 } 6695 } 6696 } 6697 6698 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6699 ExDeclType, TInfo, SC_None, SC_None); 6700 ExDecl->setExceptionVariable(true); 6701 6702 if (!Invalid) { 6703 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6704 // C++ [except.handle]p16: 6705 // The object declared in an exception-declaration or, if the 6706 // exception-declaration does not specify a name, a temporary (12.2) is 6707 // copy-initialized (8.5) from the exception object. [...] 6708 // The object is destroyed when the handler exits, after the destruction 6709 // of any automatic objects initialized within the handler. 6710 // 6711 // We just pretend to initialize the object with itself, then make sure 6712 // it can be destroyed later. 6713 QualType initType = ExDeclType; 6714 6715 InitializedEntity entity = 6716 InitializedEntity::InitializeVariable(ExDecl); 6717 InitializationKind initKind = 6718 InitializationKind::CreateCopy(Loc, SourceLocation()); 6719 6720 Expr *opaqueValue = 6721 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6722 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6723 ExprResult result = sequence.Perform(*this, entity, initKind, 6724 MultiExprArg(&opaqueValue, 1)); 6725 if (result.isInvalid()) 6726 Invalid = true; 6727 else { 6728 // If the constructor used was non-trivial, set this as the 6729 // "initializer". 6730 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6731 if (!construct->getConstructor()->isTrivial()) { 6732 Expr *init = MaybeCreateExprWithCleanups(construct); 6733 ExDecl->setInit(init); 6734 } 6735 6736 // And make sure it's destructable. 6737 FinalizeVarWithDestructor(ExDecl, recordType); 6738 } 6739 } 6740 } 6741 6742 if (Invalid) 6743 ExDecl->setInvalidDecl(); 6744 6745 return ExDecl; 6746} 6747 6748/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6749/// handler. 6750Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6751 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6752 bool Invalid = D.isInvalidType(); 6753 6754 // Check for unexpanded parameter packs. 6755 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6756 UPPC_ExceptionType)) { 6757 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6758 D.getIdentifierLoc()); 6759 Invalid = true; 6760 } 6761 6762 IdentifierInfo *II = D.getIdentifier(); 6763 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6764 LookupOrdinaryName, 6765 ForRedeclaration)) { 6766 // The scope should be freshly made just for us. There is just no way 6767 // it contains any previous declaration. 6768 assert(!S->isDeclScope(PrevDecl)); 6769 if (PrevDecl->isTemplateParameter()) { 6770 // Maybe we will complain about the shadowed template parameter. 6771 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6772 } 6773 } 6774 6775 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6776 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6777 << D.getCXXScopeSpec().getRange(); 6778 Invalid = true; 6779 } 6780 6781 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6782 D.getSourceRange().getBegin(), 6783 D.getIdentifierLoc(), 6784 D.getIdentifier()); 6785 if (Invalid) 6786 ExDecl->setInvalidDecl(); 6787 6788 // Add the exception declaration into this scope. 6789 if (II) 6790 PushOnScopeChains(ExDecl, S); 6791 else 6792 CurContext->addDecl(ExDecl); 6793 6794 ProcessDeclAttributes(S, ExDecl, D); 6795 return ExDecl; 6796} 6797 6798Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 6799 Expr *AssertExpr, 6800 Expr *AssertMessageExpr_, 6801 SourceLocation RParenLoc) { 6802 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6803 6804 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6805 llvm::APSInt Value(32); 6806 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6807 Diag(StaticAssertLoc, 6808 diag::err_static_assert_expression_is_not_constant) << 6809 AssertExpr->getSourceRange(); 6810 return 0; 6811 } 6812 6813 if (Value == 0) { 6814 Diag(StaticAssertLoc, diag::err_static_assert_failed) 6815 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6816 } 6817 } 6818 6819 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6820 return 0; 6821 6822 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 6823 AssertExpr, AssertMessage, RParenLoc); 6824 6825 CurContext->addDecl(Decl); 6826 return Decl; 6827} 6828 6829/// \brief Perform semantic analysis of the given friend type declaration. 6830/// 6831/// \returns A friend declaration that. 6832FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6833 TypeSourceInfo *TSInfo) { 6834 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6835 6836 QualType T = TSInfo->getType(); 6837 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6838 6839 if (!getLangOptions().CPlusPlus0x) { 6840 // C++03 [class.friend]p2: 6841 // An elaborated-type-specifier shall be used in a friend declaration 6842 // for a class.* 6843 // 6844 // * The class-key of the elaborated-type-specifier is required. 6845 if (!ActiveTemplateInstantiations.empty()) { 6846 // Do not complain about the form of friend template types during 6847 // template instantiation; we will already have complained when the 6848 // template was declared. 6849 } else if (!T->isElaboratedTypeSpecifier()) { 6850 // If we evaluated the type to a record type, suggest putting 6851 // a tag in front. 6852 if (const RecordType *RT = T->getAs<RecordType>()) { 6853 RecordDecl *RD = RT->getDecl(); 6854 6855 std::string InsertionText = std::string(" ") + RD->getKindName(); 6856 6857 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6858 << (unsigned) RD->getTagKind() 6859 << T 6860 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6861 InsertionText); 6862 } else { 6863 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6864 << T 6865 << SourceRange(FriendLoc, TypeRange.getEnd()); 6866 } 6867 } else if (T->getAs<EnumType>()) { 6868 Diag(FriendLoc, diag::ext_enum_friend) 6869 << T 6870 << SourceRange(FriendLoc, TypeRange.getEnd()); 6871 } 6872 } 6873 6874 // C++0x [class.friend]p3: 6875 // If the type specifier in a friend declaration designates a (possibly 6876 // cv-qualified) class type, that class is declared as a friend; otherwise, 6877 // the friend declaration is ignored. 6878 6879 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6880 // in [class.friend]p3 that we do not implement. 6881 6882 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6883} 6884 6885/// Handle a friend tag declaration where the scope specifier was 6886/// templated. 6887Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6888 unsigned TagSpec, SourceLocation TagLoc, 6889 CXXScopeSpec &SS, 6890 IdentifierInfo *Name, SourceLocation NameLoc, 6891 AttributeList *Attr, 6892 MultiTemplateParamsArg TempParamLists) { 6893 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6894 6895 bool isExplicitSpecialization = false; 6896 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6897 bool Invalid = false; 6898 6899 if (TemplateParameterList *TemplateParams 6900 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6901 TempParamLists.get(), 6902 TempParamLists.size(), 6903 /*friend*/ true, 6904 isExplicitSpecialization, 6905 Invalid)) { 6906 --NumMatchedTemplateParamLists; 6907 6908 if (TemplateParams->size() > 0) { 6909 // This is a declaration of a class template. 6910 if (Invalid) 6911 return 0; 6912 6913 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6914 SS, Name, NameLoc, Attr, 6915 TemplateParams, AS_public, 6916 NumMatchedTemplateParamLists, 6917 (TemplateParameterList**) TempParamLists.release()).take(); 6918 } else { 6919 // The "template<>" header is extraneous. 6920 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6921 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6922 isExplicitSpecialization = true; 6923 } 6924 } 6925 6926 if (Invalid) return 0; 6927 6928 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6929 6930 bool isAllExplicitSpecializations = true; 6931 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6932 if (TempParamLists.get()[I]->size()) { 6933 isAllExplicitSpecializations = false; 6934 break; 6935 } 6936 } 6937 6938 // FIXME: don't ignore attributes. 6939 6940 // If it's explicit specializations all the way down, just forget 6941 // about the template header and build an appropriate non-templated 6942 // friend. TODO: for source fidelity, remember the headers. 6943 if (isAllExplicitSpecializations) { 6944 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6945 ElaboratedTypeKeyword Keyword 6946 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6947 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 6948 *Name, NameLoc); 6949 if (T.isNull()) 6950 return 0; 6951 6952 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6953 if (isa<DependentNameType>(T)) { 6954 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6955 TL.setKeywordLoc(TagLoc); 6956 TL.setQualifierLoc(QualifierLoc); 6957 TL.setNameLoc(NameLoc); 6958 } else { 6959 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6960 TL.setKeywordLoc(TagLoc); 6961 TL.setQualifierLoc(QualifierLoc); 6962 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6963 } 6964 6965 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6966 TSI, FriendLoc); 6967 Friend->setAccess(AS_public); 6968 CurContext->addDecl(Friend); 6969 return Friend; 6970 } 6971 6972 // Handle the case of a templated-scope friend class. e.g. 6973 // template <class T> class A<T>::B; 6974 // FIXME: we don't support these right now. 6975 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6976 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6977 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6978 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6979 TL.setKeywordLoc(TagLoc); 6980 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 6981 TL.setNameLoc(NameLoc); 6982 6983 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6984 TSI, FriendLoc); 6985 Friend->setAccess(AS_public); 6986 Friend->setUnsupportedFriend(true); 6987 CurContext->addDecl(Friend); 6988 return Friend; 6989} 6990 6991 6992/// Handle a friend type declaration. This works in tandem with 6993/// ActOnTag. 6994/// 6995/// Notes on friend class templates: 6996/// 6997/// We generally treat friend class declarations as if they were 6998/// declaring a class. So, for example, the elaborated type specifier 6999/// in a friend declaration is required to obey the restrictions of a 7000/// class-head (i.e. no typedefs in the scope chain), template 7001/// parameters are required to match up with simple template-ids, &c. 7002/// However, unlike when declaring a template specialization, it's 7003/// okay to refer to a template specialization without an empty 7004/// template parameter declaration, e.g. 7005/// friend class A<T>::B<unsigned>; 7006/// We permit this as a special case; if there are any template 7007/// parameters present at all, require proper matching, i.e. 7008/// template <> template <class T> friend class A<int>::B; 7009Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7010 MultiTemplateParamsArg TempParams) { 7011 SourceLocation Loc = DS.getSourceRange().getBegin(); 7012 7013 assert(DS.isFriendSpecified()); 7014 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7015 7016 // Try to convert the decl specifier to a type. This works for 7017 // friend templates because ActOnTag never produces a ClassTemplateDecl 7018 // for a TUK_Friend. 7019 Declarator TheDeclarator(DS, Declarator::MemberContext); 7020 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7021 QualType T = TSI->getType(); 7022 if (TheDeclarator.isInvalidType()) 7023 return 0; 7024 7025 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7026 return 0; 7027 7028 // This is definitely an error in C++98. It's probably meant to 7029 // be forbidden in C++0x, too, but the specification is just 7030 // poorly written. 7031 // 7032 // The problem is with declarations like the following: 7033 // template <T> friend A<T>::foo; 7034 // where deciding whether a class C is a friend or not now hinges 7035 // on whether there exists an instantiation of A that causes 7036 // 'foo' to equal C. There are restrictions on class-heads 7037 // (which we declare (by fiat) elaborated friend declarations to 7038 // be) that makes this tractable. 7039 // 7040 // FIXME: handle "template <> friend class A<T>;", which 7041 // is possibly well-formed? Who even knows? 7042 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7043 Diag(Loc, diag::err_tagless_friend_type_template) 7044 << DS.getSourceRange(); 7045 return 0; 7046 } 7047 7048 // C++98 [class.friend]p1: A friend of a class is a function 7049 // or class that is not a member of the class . . . 7050 // This is fixed in DR77, which just barely didn't make the C++03 7051 // deadline. It's also a very silly restriction that seriously 7052 // affects inner classes and which nobody else seems to implement; 7053 // thus we never diagnose it, not even in -pedantic. 7054 // 7055 // But note that we could warn about it: it's always useless to 7056 // friend one of your own members (it's not, however, worthless to 7057 // friend a member of an arbitrary specialization of your template). 7058 7059 Decl *D; 7060 if (unsigned NumTempParamLists = TempParams.size()) 7061 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7062 NumTempParamLists, 7063 TempParams.release(), 7064 TSI, 7065 DS.getFriendSpecLoc()); 7066 else 7067 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7068 7069 if (!D) 7070 return 0; 7071 7072 D->setAccess(AS_public); 7073 CurContext->addDecl(D); 7074 7075 return D; 7076} 7077 7078Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7079 MultiTemplateParamsArg TemplateParams) { 7080 const DeclSpec &DS = D.getDeclSpec(); 7081 7082 assert(DS.isFriendSpecified()); 7083 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7084 7085 SourceLocation Loc = D.getIdentifierLoc(); 7086 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7087 QualType T = TInfo->getType(); 7088 7089 // C++ [class.friend]p1 7090 // A friend of a class is a function or class.... 7091 // Note that this sees through typedefs, which is intended. 7092 // It *doesn't* see through dependent types, which is correct 7093 // according to [temp.arg.type]p3: 7094 // If a declaration acquires a function type through a 7095 // type dependent on a template-parameter and this causes 7096 // a declaration that does not use the syntactic form of a 7097 // function declarator to have a function type, the program 7098 // is ill-formed. 7099 if (!T->isFunctionType()) { 7100 Diag(Loc, diag::err_unexpected_friend); 7101 7102 // It might be worthwhile to try to recover by creating an 7103 // appropriate declaration. 7104 return 0; 7105 } 7106 7107 // C++ [namespace.memdef]p3 7108 // - If a friend declaration in a non-local class first declares a 7109 // class or function, the friend class or function is a member 7110 // of the innermost enclosing namespace. 7111 // - The name of the friend is not found by simple name lookup 7112 // until a matching declaration is provided in that namespace 7113 // scope (either before or after the class declaration granting 7114 // friendship). 7115 // - If a friend function is called, its name may be found by the 7116 // name lookup that considers functions from namespaces and 7117 // classes associated with the types of the function arguments. 7118 // - When looking for a prior declaration of a class or a function 7119 // declared as a friend, scopes outside the innermost enclosing 7120 // namespace scope are not considered. 7121 7122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7123 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7124 DeclarationName Name = NameInfo.getName(); 7125 assert(Name); 7126 7127 // Check for unexpanded parameter packs. 7128 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7129 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7130 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7131 return 0; 7132 7133 // The context we found the declaration in, or in which we should 7134 // create the declaration. 7135 DeclContext *DC; 7136 Scope *DCScope = S; 7137 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7138 ForRedeclaration); 7139 7140 // FIXME: there are different rules in local classes 7141 7142 // There are four cases here. 7143 // - There's no scope specifier, in which case we just go to the 7144 // appropriate scope and look for a function or function template 7145 // there as appropriate. 7146 // Recover from invalid scope qualifiers as if they just weren't there. 7147 if (SS.isInvalid() || !SS.isSet()) { 7148 // C++0x [namespace.memdef]p3: 7149 // If the name in a friend declaration is neither qualified nor 7150 // a template-id and the declaration is a function or an 7151 // elaborated-type-specifier, the lookup to determine whether 7152 // the entity has been previously declared shall not consider 7153 // any scopes outside the innermost enclosing namespace. 7154 // C++0x [class.friend]p11: 7155 // If a friend declaration appears in a local class and the name 7156 // specified is an unqualified name, a prior declaration is 7157 // looked up without considering scopes that are outside the 7158 // innermost enclosing non-class scope. For a friend function 7159 // declaration, if there is no prior declaration, the program is 7160 // ill-formed. 7161 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7162 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7163 7164 // Find the appropriate context according to the above. 7165 DC = CurContext; 7166 while (true) { 7167 // Skip class contexts. If someone can cite chapter and verse 7168 // for this behavior, that would be nice --- it's what GCC and 7169 // EDG do, and it seems like a reasonable intent, but the spec 7170 // really only says that checks for unqualified existing 7171 // declarations should stop at the nearest enclosing namespace, 7172 // not that they should only consider the nearest enclosing 7173 // namespace. 7174 while (DC->isRecord()) 7175 DC = DC->getParent(); 7176 7177 LookupQualifiedName(Previous, DC); 7178 7179 // TODO: decide what we think about using declarations. 7180 if (isLocal || !Previous.empty()) 7181 break; 7182 7183 if (isTemplateId) { 7184 if (isa<TranslationUnitDecl>(DC)) break; 7185 } else { 7186 if (DC->isFileContext()) break; 7187 } 7188 DC = DC->getParent(); 7189 } 7190 7191 // C++ [class.friend]p1: A friend of a class is a function or 7192 // class that is not a member of the class . . . 7193 // C++0x changes this for both friend types and functions. 7194 // Most C++ 98 compilers do seem to give an error here, so 7195 // we do, too. 7196 if (!Previous.empty() && DC->Equals(CurContext) 7197 && !getLangOptions().CPlusPlus0x) 7198 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7199 7200 DCScope = getScopeForDeclContext(S, DC); 7201 7202 // - There's a non-dependent scope specifier, in which case we 7203 // compute it and do a previous lookup there for a function 7204 // or function template. 7205 } else if (!SS.getScopeRep()->isDependent()) { 7206 DC = computeDeclContext(SS); 7207 if (!DC) return 0; 7208 7209 if (RequireCompleteDeclContext(SS, DC)) return 0; 7210 7211 LookupQualifiedName(Previous, DC); 7212 7213 // Ignore things found implicitly in the wrong scope. 7214 // TODO: better diagnostics for this case. Suggesting the right 7215 // qualified scope would be nice... 7216 LookupResult::Filter F = Previous.makeFilter(); 7217 while (F.hasNext()) { 7218 NamedDecl *D = F.next(); 7219 if (!DC->InEnclosingNamespaceSetOf( 7220 D->getDeclContext()->getRedeclContext())) 7221 F.erase(); 7222 } 7223 F.done(); 7224 7225 if (Previous.empty()) { 7226 D.setInvalidType(); 7227 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7228 return 0; 7229 } 7230 7231 // C++ [class.friend]p1: A friend of a class is a function or 7232 // class that is not a member of the class . . . 7233 if (DC->Equals(CurContext)) 7234 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7235 7236 // - There's a scope specifier that does not match any template 7237 // parameter lists, in which case we use some arbitrary context, 7238 // create a method or method template, and wait for instantiation. 7239 // - There's a scope specifier that does match some template 7240 // parameter lists, which we don't handle right now. 7241 } else { 7242 DC = CurContext; 7243 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7244 } 7245 7246 if (!DC->isRecord()) { 7247 // This implies that it has to be an operator or function. 7248 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7249 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7250 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7251 Diag(Loc, diag::err_introducing_special_friend) << 7252 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7253 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7254 return 0; 7255 } 7256 } 7257 7258 bool Redeclaration = false; 7259 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7260 move(TemplateParams), 7261 IsDefinition, 7262 Redeclaration); 7263 if (!ND) return 0; 7264 7265 assert(ND->getDeclContext() == DC); 7266 assert(ND->getLexicalDeclContext() == CurContext); 7267 7268 // Add the function declaration to the appropriate lookup tables, 7269 // adjusting the redeclarations list as necessary. We don't 7270 // want to do this yet if the friending class is dependent. 7271 // 7272 // Also update the scope-based lookup if the target context's 7273 // lookup context is in lexical scope. 7274 if (!CurContext->isDependentContext()) { 7275 DC = DC->getRedeclContext(); 7276 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7277 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7278 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7279 } 7280 7281 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7282 D.getIdentifierLoc(), ND, 7283 DS.getFriendSpecLoc()); 7284 FrD->setAccess(AS_public); 7285 CurContext->addDecl(FrD); 7286 7287 if (ND->isInvalidDecl()) 7288 FrD->setInvalidDecl(); 7289 else { 7290 FunctionDecl *FD; 7291 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7292 FD = FTD->getTemplatedDecl(); 7293 else 7294 FD = cast<FunctionDecl>(ND); 7295 7296 // Mark templated-scope function declarations as unsupported. 7297 if (FD->getNumTemplateParameterLists()) 7298 FrD->setUnsupportedFriend(true); 7299 } 7300 7301 return ND; 7302} 7303 7304void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7305 AdjustDeclIfTemplate(Dcl); 7306 7307 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7308 if (!Fn) { 7309 Diag(DelLoc, diag::err_deleted_non_function); 7310 return; 7311 } 7312 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7313 Diag(DelLoc, diag::err_deleted_decl_not_first); 7314 Diag(Prev->getLocation(), diag::note_previous_declaration); 7315 // If the declaration wasn't the first, we delete the function anyway for 7316 // recovery. 7317 } 7318 Fn->setDeleted(); 7319} 7320 7321static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7322 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7323 Stmt *SubStmt = *CI; 7324 if (!SubStmt) 7325 continue; 7326 if (isa<ReturnStmt>(SubStmt)) 7327 Self.Diag(SubStmt->getSourceRange().getBegin(), 7328 diag::err_return_in_constructor_handler); 7329 if (!isa<Expr>(SubStmt)) 7330 SearchForReturnInStmt(Self, SubStmt); 7331 } 7332} 7333 7334void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7335 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7336 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7337 SearchForReturnInStmt(*this, Handler); 7338 } 7339} 7340 7341bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7342 const CXXMethodDecl *Old) { 7343 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7344 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7345 7346 if (Context.hasSameType(NewTy, OldTy) || 7347 NewTy->isDependentType() || OldTy->isDependentType()) 7348 return false; 7349 7350 // Check if the return types are covariant 7351 QualType NewClassTy, OldClassTy; 7352 7353 /// Both types must be pointers or references to classes. 7354 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7355 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7356 NewClassTy = NewPT->getPointeeType(); 7357 OldClassTy = OldPT->getPointeeType(); 7358 } 7359 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7360 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7361 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7362 NewClassTy = NewRT->getPointeeType(); 7363 OldClassTy = OldRT->getPointeeType(); 7364 } 7365 } 7366 } 7367 7368 // The return types aren't either both pointers or references to a class type. 7369 if (NewClassTy.isNull()) { 7370 Diag(New->getLocation(), 7371 diag::err_different_return_type_for_overriding_virtual_function) 7372 << New->getDeclName() << NewTy << OldTy; 7373 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7374 7375 return true; 7376 } 7377 7378 // C++ [class.virtual]p6: 7379 // If the return type of D::f differs from the return type of B::f, the 7380 // class type in the return type of D::f shall be complete at the point of 7381 // declaration of D::f or shall be the class type D. 7382 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7383 if (!RT->isBeingDefined() && 7384 RequireCompleteType(New->getLocation(), NewClassTy, 7385 PDiag(diag::err_covariant_return_incomplete) 7386 << New->getDeclName())) 7387 return true; 7388 } 7389 7390 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7391 // Check if the new class derives from the old class. 7392 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7393 Diag(New->getLocation(), 7394 diag::err_covariant_return_not_derived) 7395 << New->getDeclName() << NewTy << OldTy; 7396 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7397 return true; 7398 } 7399 7400 // Check if we the conversion from derived to base is valid. 7401 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7402 diag::err_covariant_return_inaccessible_base, 7403 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7404 // FIXME: Should this point to the return type? 7405 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7406 // FIXME: this note won't trigger for delayed access control 7407 // diagnostics, and it's impossible to get an undelayed error 7408 // here from access control during the original parse because 7409 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7410 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7411 return true; 7412 } 7413 } 7414 7415 // The qualifiers of the return types must be the same. 7416 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7417 Diag(New->getLocation(), 7418 diag::err_covariant_return_type_different_qualifications) 7419 << New->getDeclName() << NewTy << OldTy; 7420 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7421 return true; 7422 }; 7423 7424 7425 // The new class type must have the same or less qualifiers as the old type. 7426 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7427 Diag(New->getLocation(), 7428 diag::err_covariant_return_type_class_type_more_qualified) 7429 << New->getDeclName() << NewTy << OldTy; 7430 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7431 return true; 7432 }; 7433 7434 return false; 7435} 7436 7437/// \brief Mark the given method pure. 7438/// 7439/// \param Method the method to be marked pure. 7440/// 7441/// \param InitRange the source range that covers the "0" initializer. 7442bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7443 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7444 Method->setPure(); 7445 return false; 7446 } 7447 7448 if (!Method->isInvalidDecl()) 7449 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7450 << Method->getDeclName() << InitRange; 7451 return true; 7452} 7453 7454/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7455/// an initializer for the out-of-line declaration 'Dcl'. The scope 7456/// is a fresh scope pushed for just this purpose. 7457/// 7458/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7459/// static data member of class X, names should be looked up in the scope of 7460/// class X. 7461void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7462 // If there is no declaration, there was an error parsing it. 7463 if (D == 0) return; 7464 7465 // We should only get called for declarations with scope specifiers, like: 7466 // int foo::bar; 7467 assert(D->isOutOfLine()); 7468 EnterDeclaratorContext(S, D->getDeclContext()); 7469} 7470 7471/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7472/// initializer for the out-of-line declaration 'D'. 7473void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7474 // If there is no declaration, there was an error parsing it. 7475 if (D == 0) return; 7476 7477 assert(D->isOutOfLine()); 7478 ExitDeclaratorContext(S); 7479} 7480 7481/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7482/// C++ if/switch/while/for statement. 7483/// e.g: "if (int x = f()) {...}" 7484DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7485 // C++ 6.4p2: 7486 // The declarator shall not specify a function or an array. 7487 // The type-specifier-seq shall not contain typedef and shall not declare a 7488 // new class or enumeration. 7489 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7490 "Parser allowed 'typedef' as storage class of condition decl."); 7491 7492 TagDecl *OwnedTag = 0; 7493 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7494 QualType Ty = TInfo->getType(); 7495 7496 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7497 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7498 // would be created and CXXConditionDeclExpr wants a VarDecl. 7499 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7500 << D.getSourceRange(); 7501 return DeclResult(); 7502 } else if (OwnedTag && OwnedTag->isDefinition()) { 7503 // The type-specifier-seq shall not declare a new class or enumeration. 7504 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7505 } 7506 7507 Decl *Dcl = ActOnDeclarator(S, D); 7508 if (!Dcl) 7509 return DeclResult(); 7510 7511 return Dcl; 7512} 7513 7514void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7515 bool DefinitionRequired) { 7516 // Ignore any vtable uses in unevaluated operands or for classes that do 7517 // not have a vtable. 7518 if (!Class->isDynamicClass() || Class->isDependentContext() || 7519 CurContext->isDependentContext() || 7520 ExprEvalContexts.back().Context == Unevaluated) 7521 return; 7522 7523 // Try to insert this class into the map. 7524 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7525 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7526 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7527 if (!Pos.second) { 7528 // If we already had an entry, check to see if we are promoting this vtable 7529 // to required a definition. If so, we need to reappend to the VTableUses 7530 // list, since we may have already processed the first entry. 7531 if (DefinitionRequired && !Pos.first->second) { 7532 Pos.first->second = true; 7533 } else { 7534 // Otherwise, we can early exit. 7535 return; 7536 } 7537 } 7538 7539 // Local classes need to have their virtual members marked 7540 // immediately. For all other classes, we mark their virtual members 7541 // at the end of the translation unit. 7542 if (Class->isLocalClass()) 7543 MarkVirtualMembersReferenced(Loc, Class); 7544 else 7545 VTableUses.push_back(std::make_pair(Class, Loc)); 7546} 7547 7548bool Sema::DefineUsedVTables() { 7549 if (VTableUses.empty()) 7550 return false; 7551 7552 // Note: The VTableUses vector could grow as a result of marking 7553 // the members of a class as "used", so we check the size each 7554 // time through the loop and prefer indices (with are stable) to 7555 // iterators (which are not). 7556 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7557 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7558 if (!Class) 7559 continue; 7560 7561 SourceLocation Loc = VTableUses[I].second; 7562 7563 // If this class has a key function, but that key function is 7564 // defined in another translation unit, we don't need to emit the 7565 // vtable even though we're using it. 7566 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7567 if (KeyFunction && !KeyFunction->hasBody()) { 7568 switch (KeyFunction->getTemplateSpecializationKind()) { 7569 case TSK_Undeclared: 7570 case TSK_ExplicitSpecialization: 7571 case TSK_ExplicitInstantiationDeclaration: 7572 // The key function is in another translation unit. 7573 continue; 7574 7575 case TSK_ExplicitInstantiationDefinition: 7576 case TSK_ImplicitInstantiation: 7577 // We will be instantiating the key function. 7578 break; 7579 } 7580 } else if (!KeyFunction) { 7581 // If we have a class with no key function that is the subject 7582 // of an explicit instantiation declaration, suppress the 7583 // vtable; it will live with the explicit instantiation 7584 // definition. 7585 bool IsExplicitInstantiationDeclaration 7586 = Class->getTemplateSpecializationKind() 7587 == TSK_ExplicitInstantiationDeclaration; 7588 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7589 REnd = Class->redecls_end(); 7590 R != REnd; ++R) { 7591 TemplateSpecializationKind TSK 7592 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7593 if (TSK == TSK_ExplicitInstantiationDeclaration) 7594 IsExplicitInstantiationDeclaration = true; 7595 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7596 IsExplicitInstantiationDeclaration = false; 7597 break; 7598 } 7599 } 7600 7601 if (IsExplicitInstantiationDeclaration) 7602 continue; 7603 } 7604 7605 // Mark all of the virtual members of this class as referenced, so 7606 // that we can build a vtable. Then, tell the AST consumer that a 7607 // vtable for this class is required. 7608 MarkVirtualMembersReferenced(Loc, Class); 7609 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7610 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7611 7612 // Optionally warn if we're emitting a weak vtable. 7613 if (Class->getLinkage() == ExternalLinkage && 7614 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7615 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7616 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7617 } 7618 } 7619 VTableUses.clear(); 7620 7621 return true; 7622} 7623 7624void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7625 const CXXRecordDecl *RD) { 7626 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7627 e = RD->method_end(); i != e; ++i) { 7628 CXXMethodDecl *MD = *i; 7629 7630 // C++ [basic.def.odr]p2: 7631 // [...] A virtual member function is used if it is not pure. [...] 7632 if (MD->isVirtual() && !MD->isPure()) 7633 MarkDeclarationReferenced(Loc, MD); 7634 } 7635 7636 // Only classes that have virtual bases need a VTT. 7637 if (RD->getNumVBases() == 0) 7638 return; 7639 7640 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7641 e = RD->bases_end(); i != e; ++i) { 7642 const CXXRecordDecl *Base = 7643 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7644 if (Base->getNumVBases() == 0) 7645 continue; 7646 MarkVirtualMembersReferenced(Loc, Base); 7647 } 7648} 7649 7650/// SetIvarInitializers - This routine builds initialization ASTs for the 7651/// Objective-C implementation whose ivars need be initialized. 7652void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7653 if (!getLangOptions().CPlusPlus) 7654 return; 7655 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7656 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7657 CollectIvarsToConstructOrDestruct(OID, ivars); 7658 if (ivars.empty()) 7659 return; 7660 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7661 for (unsigned i = 0; i < ivars.size(); i++) { 7662 FieldDecl *Field = ivars[i]; 7663 if (Field->isInvalidDecl()) 7664 continue; 7665 7666 CXXCtorInitializer *Member; 7667 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7668 InitializationKind InitKind = 7669 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7670 7671 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7672 ExprResult MemberInit = 7673 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7674 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7675 // Note, MemberInit could actually come back empty if no initialization 7676 // is required (e.g., because it would call a trivial default constructor) 7677 if (!MemberInit.get() || MemberInit.isInvalid()) 7678 continue; 7679 7680 Member = 7681 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7682 SourceLocation(), 7683 MemberInit.takeAs<Expr>(), 7684 SourceLocation()); 7685 AllToInit.push_back(Member); 7686 7687 // Be sure that the destructor is accessible and is marked as referenced. 7688 if (const RecordType *RecordTy 7689 = Context.getBaseElementType(Field->getType()) 7690 ->getAs<RecordType>()) { 7691 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7692 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7693 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7694 CheckDestructorAccess(Field->getLocation(), Destructor, 7695 PDiag(diag::err_access_dtor_ivar) 7696 << Context.getBaseElementType(Field->getType())); 7697 } 7698 } 7699 } 7700 ObjCImplementation->setIvarInitializers(Context, 7701 AllToInit.data(), AllToInit.size()); 7702 } 7703} 7704