SemaDeclCXX.cpp revision eee1d5434ebfa955ffc3c493aecd68bb7b3f4838
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/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_range I = Node->children(); I; ++I) 67 IsInvalid |= Visit(*I); 68 return IsInvalid; 69 } 70 71 /// VisitDeclRefExpr - Visit a reference to a declaration, to 72 /// determine whether this declaration can be used in the default 73 /// argument expression. 74 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 75 NamedDecl *Decl = DRE->getDecl(); 76 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 77 // C++ [dcl.fct.default]p9 78 // Default arguments are evaluated each time the function is 79 // called. The order of evaluation of function arguments is 80 // unspecified. Consequently, parameters of a function shall not 81 // be used in default argument expressions, even if they are not 82 // evaluated. Parameters of a function declared before a default 83 // argument expression are in scope and can hide namespace and 84 // class member names. 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_param) 87 << Param->getDeclName() << DefaultArg->getSourceRange(); 88 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 89 // C++ [dcl.fct.default]p7 90 // Local variables shall not be used in default argument 91 // expressions. 92 if (VDecl->isLocalVarDecl()) 93 return S->Diag(DRE->getSourceRange().getBegin(), 94 diag::err_param_default_argument_references_local) 95 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 96 } 97 98 return false; 99 } 100 101 /// VisitCXXThisExpr - Visit a C++ "this" expression. 102 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 103 // C++ [dcl.fct.default]p8: 104 // The keyword this shall not be used in a default argument of a 105 // member function. 106 return S->Diag(ThisE->getSourceRange().getBegin(), 107 diag::err_param_default_argument_references_this) 108 << ThisE->getSourceRange(); 109 } 110} 111 112bool 113Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 114 SourceLocation EqualLoc) { 115 if (RequireCompleteType(Param->getLocation(), Param->getType(), 116 diag::err_typecheck_decl_incomplete_type)) { 117 Param->setInvalidDecl(); 118 return true; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 128 Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, &Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 CheckImplicitConversions(Arg, EqualLoc); 139 Arg = MaybeCreateExprWithCleanups(Arg); 140 141 // Okay: add the default argument to the parameter 142 Param->setDefaultArg(Arg); 143 144 // We have already instantiated this parameter; provide each of the 145 // instantiations with the uninstantiated default argument. 146 UnparsedDefaultArgInstantiationsMap::iterator InstPos 147 = UnparsedDefaultArgInstantiations.find(Param); 148 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 149 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 150 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 151 152 // We're done tracking this parameter's instantiations. 153 UnparsedDefaultArgInstantiations.erase(InstPos); 154 } 155 156 return false; 157} 158 159/// ActOnParamDefaultArgument - Check whether the default argument 160/// provided for a function parameter is well-formed. If so, attach it 161/// to the parameter declaration. 162void 163Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 164 Expr *DefaultArg) { 165 if (!param || !DefaultArg) 166 return; 167 168 ParmVarDecl *Param = cast<ParmVarDecl>(param); 169 UnparsedDefaultArgLocs.erase(Param); 170 171 // Default arguments are only permitted in C++ 172 if (!getLangOptions().CPlusPlus) { 173 Diag(EqualLoc, diag::err_param_default_argument) 174 << DefaultArg->getSourceRange(); 175 Param->setInvalidDecl(); 176 return; 177 } 178 179 // Check for unexpanded parameter packs. 180 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 181 Param->setInvalidDecl(); 182 return; 183 } 184 185 // Check that the default argument is well-formed 186 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 187 if (DefaultArgChecker.Visit(DefaultArg)) { 188 Param->setInvalidDecl(); 189 return; 190 } 191 192 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 193} 194 195/// ActOnParamUnparsedDefaultArgument - We've seen a default 196/// argument for a function parameter, but we can't parse it yet 197/// because we're inside a class definition. Note that this default 198/// argument will be parsed later. 199void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 200 SourceLocation EqualLoc, 201 SourceLocation ArgLoc) { 202 if (!param) 203 return; 204 205 ParmVarDecl *Param = cast<ParmVarDecl>(param); 206 if (Param) 207 Param->setUnparsedDefaultArg(); 208 209 UnparsedDefaultArgLocs[Param] = ArgLoc; 210} 211 212/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 213/// the default argument for the parameter param failed. 214void Sema::ActOnParamDefaultArgumentError(Decl *param) { 215 if (!param) 216 return; 217 218 ParmVarDecl *Param = cast<ParmVarDecl>(param); 219 220 Param->setInvalidDecl(); 221 222 UnparsedDefaultArgLocs.erase(Param); 223} 224 225/// CheckExtraCXXDefaultArguments - Check for any extra default 226/// arguments in the declarator, which is not a function declaration 227/// or definition and therefore is not permitted to have default 228/// arguments. This routine should be invoked for every declarator 229/// that is not a function declaration or definition. 230void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 231 // C++ [dcl.fct.default]p3 232 // A default argument expression shall be specified only in the 233 // parameter-declaration-clause of a function declaration or in a 234 // template-parameter (14.1). It shall not be specified for a 235 // parameter pack. If it is specified in a 236 // parameter-declaration-clause, it shall not occur within a 237 // declarator or abstract-declarator of a parameter-declaration. 238 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 239 DeclaratorChunk &chunk = D.getTypeObject(i); 240 if (chunk.Kind == DeclaratorChunk::Function) { 241 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 242 ParmVarDecl *Param = 243 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 244 if (Param->hasUnparsedDefaultArg()) { 245 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 248 delete Toks; 249 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 250 } else if (Param->getDefaultArg()) { 251 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 252 << Param->getDefaultArg()->getSourceRange(); 253 Param->setDefaultArg(0); 254 } 255 } 256 } 257 } 258} 259 260// MergeCXXFunctionDecl - Merge two declarations of the same C++ 261// function, once we already know that they have the same 262// type. Subroutine of MergeFunctionDecl. Returns true if there was an 263// error, false otherwise. 264bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 265 bool Invalid = false; 266 267 // C++ [dcl.fct.default]p4: 268 // For non-template functions, default arguments can be added in 269 // later declarations of a function in the same 270 // scope. Declarations in different scopes have completely 271 // distinct sets of default arguments. That is, declarations in 272 // inner scopes do not acquire default arguments from 273 // declarations in outer scopes, and vice versa. In a given 274 // function declaration, all parameters subsequent to a 275 // parameter with a default argument shall have default 276 // arguments supplied in this or previous declarations. A 277 // default argument shall not be redefined by a later 278 // declaration (not even to the same value). 279 // 280 // C++ [dcl.fct.default]p6: 281 // Except for member functions of class templates, the default arguments 282 // in a member function definition that appears outside of the class 283 // definition are added to the set of default arguments provided by the 284 // member function declaration in the class definition. 285 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 286 ParmVarDecl *OldParam = Old->getParamDecl(p); 287 ParmVarDecl *NewParam = New->getParamDecl(p); 288 289 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 290 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 291 // hint here. Alternatively, we could walk the type-source information 292 // for NewParam to find the last source location in the type... but it 293 // isn't worth the effort right now. This is the kind of test case that 294 // is hard to get right: 295 296 // int f(int); 297 // void g(int (*fp)(int) = f); 298 // void g(int (*fp)(int) = &f); 299 Diag(NewParam->getLocation(), 300 diag::err_param_default_argument_redefinition) 301 << NewParam->getDefaultArgRange(); 302 303 // Look for the function declaration where the default argument was 304 // actually written, which may be a declaration prior to Old. 305 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 306 Older; Older = Older->getPreviousDeclaration()) { 307 if (!Older->getParamDecl(p)->hasDefaultArg()) 308 break; 309 310 OldParam = Older->getParamDecl(p); 311 } 312 313 Diag(OldParam->getLocation(), diag::note_previous_definition) 314 << OldParam->getDefaultArgRange(); 315 Invalid = true; 316 } else if (OldParam->hasDefaultArg()) { 317 // Merge the old default argument into the new parameter. 318 // It's important to use getInit() here; getDefaultArg() 319 // strips off any top-level ExprWithCleanups. 320 NewParam->setHasInheritedDefaultArg(); 321 if (OldParam->hasUninstantiatedDefaultArg()) 322 NewParam->setUninstantiatedDefaultArg( 323 OldParam->getUninstantiatedDefaultArg()); 324 else 325 NewParam->setDefaultArg(OldParam->getInit()); 326 } else if (NewParam->hasDefaultArg()) { 327 if (New->getDescribedFunctionTemplate()) { 328 // Paragraph 4, quoted above, only applies to non-template functions. 329 Diag(NewParam->getLocation(), 330 diag::err_param_default_argument_template_redecl) 331 << NewParam->getDefaultArgRange(); 332 Diag(Old->getLocation(), diag::note_template_prev_declaration) 333 << false; 334 } else if (New->getTemplateSpecializationKind() 335 != TSK_ImplicitInstantiation && 336 New->getTemplateSpecializationKind() != TSK_Undeclared) { 337 // C++ [temp.expr.spec]p21: 338 // Default function arguments shall not be specified in a declaration 339 // or a definition for one of the following explicit specializations: 340 // - the explicit specialization of a function template; 341 // - the explicit specialization of a member function template; 342 // - the explicit specialization of a member function of a class 343 // template where the class template specialization to which the 344 // member function specialization belongs is implicitly 345 // instantiated. 346 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 347 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 348 << New->getDeclName() 349 << NewParam->getDefaultArgRange(); 350 } else if (New->getDeclContext()->isDependentContext()) { 351 // C++ [dcl.fct.default]p6 (DR217): 352 // Default arguments for a member function of a class template shall 353 // be specified on the initial declaration of the member function 354 // within the class template. 355 // 356 // Reading the tea leaves a bit in DR217 and its reference to DR205 357 // leads me to the conclusion that one cannot add default function 358 // arguments for an out-of-line definition of a member function of a 359 // dependent type. 360 int WhichKind = 2; 361 if (CXXRecordDecl *Record 362 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 363 if (Record->getDescribedClassTemplate()) 364 WhichKind = 0; 365 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 366 WhichKind = 1; 367 else 368 WhichKind = 2; 369 } 370 371 Diag(NewParam->getLocation(), 372 diag::err_param_default_argument_member_template_redecl) 373 << WhichKind 374 << NewParam->getDefaultArgRange(); 375 } 376 } 377 } 378 379 if (CheckEquivalentExceptionSpec(Old, New)) 380 Invalid = true; 381 382 return Invalid; 383} 384 385/// CheckCXXDefaultArguments - Verify that the default arguments for a 386/// function declaration are well-formed according to C++ 387/// [dcl.fct.default]. 388void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 389 unsigned NumParams = FD->getNumParams(); 390 unsigned p; 391 392 // Find first parameter with a default argument 393 for (p = 0; p < NumParams; ++p) { 394 ParmVarDecl *Param = FD->getParamDecl(p); 395 if (Param->hasDefaultArg()) 396 break; 397 } 398 399 // C++ [dcl.fct.default]p4: 400 // In a given function declaration, all parameters 401 // subsequent to a parameter with a default argument shall 402 // have default arguments supplied in this or previous 403 // declarations. A default argument shall not be redefined 404 // by a later declaration (not even to the same value). 405 unsigned LastMissingDefaultArg = 0; 406 for (; p < NumParams; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (!Param->hasDefaultArg()) { 409 if (Param->isInvalidDecl()) 410 /* We already complained about this parameter. */; 411 else if (Param->getIdentifier()) 412 Diag(Param->getLocation(), 413 diag::err_param_default_argument_missing_name) 414 << Param->getIdentifier(); 415 else 416 Diag(Param->getLocation(), 417 diag::err_param_default_argument_missing); 418 419 LastMissingDefaultArg = p; 420 } 421 } 422 423 if (LastMissingDefaultArg > 0) { 424 // Some default arguments were missing. Clear out all of the 425 // default arguments up to (and including) the last missing 426 // default argument, so that we leave the function parameters 427 // in a semantically valid state. 428 for (p = 0; p <= LastMissingDefaultArg; ++p) { 429 ParmVarDecl *Param = FD->getParamDecl(p); 430 if (Param->hasDefaultArg()) { 431 Param->setDefaultArg(0); 432 } 433 } 434 } 435} 436 437/// isCurrentClassName - Determine whether the identifier II is the 438/// name of the class type currently being defined. In the case of 439/// nested classes, this will only return true if II is the name of 440/// the innermost class. 441bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 442 const CXXScopeSpec *SS) { 443 assert(getLangOptions().CPlusPlus && "No class names in C!"); 444 445 CXXRecordDecl *CurDecl; 446 if (SS && SS->isSet() && !SS->isInvalid()) { 447 DeclContext *DC = computeDeclContext(*SS, true); 448 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 449 } else 450 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 451 452 if (CurDecl && CurDecl->getIdentifier()) 453 return &II == CurDecl->getIdentifier(); 454 else 455 return false; 456} 457 458/// \brief Check the validity of a C++ base class specifier. 459/// 460/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 461/// and returns NULL otherwise. 462CXXBaseSpecifier * 463Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 464 SourceRange SpecifierRange, 465 bool Virtual, AccessSpecifier Access, 466 TypeSourceInfo *TInfo, 467 SourceLocation EllipsisLoc) { 468 QualType BaseType = TInfo->getType(); 469 470 // C++ [class.union]p1: 471 // A union shall not have base classes. 472 if (Class->isUnion()) { 473 Diag(Class->getLocation(), diag::err_base_clause_on_union) 474 << SpecifierRange; 475 return 0; 476 } 477 478 if (EllipsisLoc.isValid() && 479 !TInfo->getType()->containsUnexpandedParameterPack()) { 480 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 481 << TInfo->getTypeLoc().getSourceRange(); 482 EllipsisLoc = SourceLocation(); 483 } 484 485 if (BaseType->isDependentType()) 486 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 487 Class->getTagKind() == TTK_Class, 488 Access, TInfo, EllipsisLoc); 489 490 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 491 492 // Base specifiers must be record types. 493 if (!BaseType->isRecordType()) { 494 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 495 return 0; 496 } 497 498 // C++ [class.union]p1: 499 // A union shall not be used as a base class. 500 if (BaseType->isUnionType()) { 501 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 502 return 0; 503 } 504 505 // C++ [class.derived]p2: 506 // The class-name in a base-specifier shall not be an incompletely 507 // defined class. 508 if (RequireCompleteType(BaseLoc, BaseType, 509 PDiag(diag::err_incomplete_base_class) 510 << SpecifierRange)) { 511 Class->setInvalidDecl(); 512 return 0; 513 } 514 515 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 516 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 517 assert(BaseDecl && "Record type has no declaration"); 518 BaseDecl = BaseDecl->getDefinition(); 519 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 520 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 521 assert(CXXBaseDecl && "Base type is not a C++ type"); 522 523 // C++ [class.derived]p2: 524 // If a class is marked with the class-virt-specifier final and it appears 525 // as a base-type-specifier in a base-clause (10 class.derived), the program 526 // is ill-formed. 527 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 528 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 529 << CXXBaseDecl->getDeclName(); 530 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 531 << CXXBaseDecl->getDeclName(); 532 return 0; 533 } 534 535 if (BaseDecl->isInvalidDecl()) 536 Class->setInvalidDecl(); 537 538 // Create the base specifier. 539 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 540 Class->getTagKind() == TTK_Class, 541 Access, TInfo, EllipsisLoc); 542} 543 544/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 545/// one entry in the base class list of a class specifier, for 546/// example: 547/// class foo : public bar, virtual private baz { 548/// 'public bar' and 'virtual private baz' are each base-specifiers. 549BaseResult 550Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 551 bool Virtual, AccessSpecifier Access, 552 ParsedType basetype, SourceLocation BaseLoc, 553 SourceLocation EllipsisLoc) { 554 if (!classdecl) 555 return true; 556 557 AdjustDeclIfTemplate(classdecl); 558 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 559 if (!Class) 560 return true; 561 562 TypeSourceInfo *TInfo = 0; 563 GetTypeFromParser(basetype, &TInfo); 564 565 if (EllipsisLoc.isInvalid() && 566 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 567 UPPC_BaseType)) 568 return true; 569 570 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 571 Virtual, Access, TInfo, 572 EllipsisLoc)) 573 return BaseSpec; 574 575 return true; 576} 577 578/// \brief Performs the actual work of attaching the given base class 579/// specifiers to a C++ class. 580bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 581 unsigned NumBases) { 582 if (NumBases == 0) 583 return false; 584 585 // Used to keep track of which base types we have already seen, so 586 // that we can properly diagnose redundant direct base types. Note 587 // that the key is always the unqualified canonical type of the base 588 // class. 589 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 590 591 // Copy non-redundant base specifiers into permanent storage. 592 unsigned NumGoodBases = 0; 593 bool Invalid = false; 594 for (unsigned idx = 0; idx < NumBases; ++idx) { 595 QualType NewBaseType 596 = Context.getCanonicalType(Bases[idx]->getType()); 597 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 598 if (!Class->hasObjectMember()) { 599 if (const RecordType *FDTTy = 600 NewBaseType.getTypePtr()->getAs<RecordType>()) 601 if (FDTTy->getDecl()->hasObjectMember()) 602 Class->setHasObjectMember(true); 603 } 604 605 if (KnownBaseTypes[NewBaseType]) { 606 // C++ [class.mi]p3: 607 // A class shall not be specified as a direct base class of a 608 // derived class more than once. 609 Diag(Bases[idx]->getSourceRange().getBegin(), 610 diag::err_duplicate_base_class) 611 << KnownBaseTypes[NewBaseType]->getType() 612 << Bases[idx]->getSourceRange(); 613 614 // Delete the duplicate base class specifier; we're going to 615 // overwrite its pointer later. 616 Context.Deallocate(Bases[idx]); 617 618 Invalid = true; 619 } else { 620 // Okay, add this new base class. 621 KnownBaseTypes[NewBaseType] = Bases[idx]; 622 Bases[NumGoodBases++] = Bases[idx]; 623 } 624 } 625 626 // Attach the remaining base class specifiers to the derived class. 627 Class->setBases(Bases, NumGoodBases); 628 629 // Delete the remaining (good) base class specifiers, since their 630 // data has been copied into the CXXRecordDecl. 631 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 632 Context.Deallocate(Bases[idx]); 633 634 return Invalid; 635} 636 637/// ActOnBaseSpecifiers - Attach the given base specifiers to the 638/// class, after checking whether there are any duplicate base 639/// classes. 640void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 641 unsigned NumBases) { 642 if (!ClassDecl || !Bases || !NumBases) 643 return; 644 645 AdjustDeclIfTemplate(ClassDecl); 646 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 647 (CXXBaseSpecifier**)(Bases), NumBases); 648} 649 650static CXXRecordDecl *GetClassForType(QualType T) { 651 if (const RecordType *RT = T->getAs<RecordType>()) 652 return cast<CXXRecordDecl>(RT->getDecl()); 653 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 654 return ICT->getDecl(); 655 else 656 return 0; 657} 658 659/// \brief Determine whether the type \p Derived is a C++ class that is 660/// derived from the type \p Base. 661bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 662 if (!getLangOptions().CPlusPlus) 663 return false; 664 665 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 666 if (!DerivedRD) 667 return false; 668 669 CXXRecordDecl *BaseRD = GetClassForType(Base); 670 if (!BaseRD) 671 return false; 672 673 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 674 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 675} 676 677/// \brief Determine whether the type \p Derived is a C++ class that is 678/// derived from the type \p Base. 679bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 680 if (!getLangOptions().CPlusPlus) 681 return false; 682 683 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 684 if (!DerivedRD) 685 return false; 686 687 CXXRecordDecl *BaseRD = GetClassForType(Base); 688 if (!BaseRD) 689 return false; 690 691 return DerivedRD->isDerivedFrom(BaseRD, Paths); 692} 693 694void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 695 CXXCastPath &BasePathArray) { 696 assert(BasePathArray.empty() && "Base path array must be empty!"); 697 assert(Paths.isRecordingPaths() && "Must record paths!"); 698 699 const CXXBasePath &Path = Paths.front(); 700 701 // We first go backward and check if we have a virtual base. 702 // FIXME: It would be better if CXXBasePath had the base specifier for 703 // the nearest virtual base. 704 unsigned Start = 0; 705 for (unsigned I = Path.size(); I != 0; --I) { 706 if (Path[I - 1].Base->isVirtual()) { 707 Start = I - 1; 708 break; 709 } 710 } 711 712 // Now add all bases. 713 for (unsigned I = Start, E = Path.size(); I != E; ++I) 714 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 715} 716 717/// \brief Determine whether the given base path includes a virtual 718/// base class. 719bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 720 for (CXXCastPath::const_iterator B = BasePath.begin(), 721 BEnd = BasePath.end(); 722 B != BEnd; ++B) 723 if ((*B)->isVirtual()) 724 return true; 725 726 return false; 727} 728 729/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 730/// conversion (where Derived and Base are class types) is 731/// well-formed, meaning that the conversion is unambiguous (and 732/// that all of the base classes are accessible). Returns true 733/// and emits a diagnostic if the code is ill-formed, returns false 734/// otherwise. Loc is the location where this routine should point to 735/// if there is an error, and Range is the source range to highlight 736/// if there is an error. 737bool 738Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 739 unsigned InaccessibleBaseID, 740 unsigned AmbigiousBaseConvID, 741 SourceLocation Loc, SourceRange Range, 742 DeclarationName Name, 743 CXXCastPath *BasePath) { 744 // First, determine whether the path from Derived to Base is 745 // ambiguous. This is slightly more expensive than checking whether 746 // the Derived to Base conversion exists, because here we need to 747 // explore multiple paths to determine if there is an ambiguity. 748 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 749 /*DetectVirtual=*/false); 750 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 751 assert(DerivationOkay && 752 "Can only be used with a derived-to-base conversion"); 753 (void)DerivationOkay; 754 755 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 756 if (InaccessibleBaseID) { 757 // Check that the base class can be accessed. 758 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 759 InaccessibleBaseID)) { 760 case AR_inaccessible: 761 return true; 762 case AR_accessible: 763 case AR_dependent: 764 case AR_delayed: 765 break; 766 } 767 } 768 769 // Build a base path if necessary. 770 if (BasePath) 771 BuildBasePathArray(Paths, *BasePath); 772 return false; 773 } 774 775 // We know that the derived-to-base conversion is ambiguous, and 776 // we're going to produce a diagnostic. Perform the derived-to-base 777 // search just one more time to compute all of the possible paths so 778 // that we can print them out. This is more expensive than any of 779 // the previous derived-to-base checks we've done, but at this point 780 // performance isn't as much of an issue. 781 Paths.clear(); 782 Paths.setRecordingPaths(true); 783 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 784 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 785 (void)StillOkay; 786 787 // Build up a textual representation of the ambiguous paths, e.g., 788 // D -> B -> A, that will be used to illustrate the ambiguous 789 // conversions in the diagnostic. We only print one of the paths 790 // to each base class subobject. 791 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 792 793 Diag(Loc, AmbigiousBaseConvID) 794 << Derived << Base << PathDisplayStr << Range << Name; 795 return true; 796} 797 798bool 799Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 800 SourceLocation Loc, SourceRange Range, 801 CXXCastPath *BasePath, 802 bool IgnoreAccess) { 803 return CheckDerivedToBaseConversion(Derived, Base, 804 IgnoreAccess ? 0 805 : diag::err_upcast_to_inaccessible_base, 806 diag::err_ambiguous_derived_to_base_conv, 807 Loc, Range, DeclarationName(), 808 BasePath); 809} 810 811 812/// @brief Builds a string representing ambiguous paths from a 813/// specific derived class to different subobjects of the same base 814/// class. 815/// 816/// This function builds a string that can be used in error messages 817/// to show the different paths that one can take through the 818/// inheritance hierarchy to go from the derived class to different 819/// subobjects of a base class. The result looks something like this: 820/// @code 821/// struct D -> struct B -> struct A 822/// struct D -> struct C -> struct A 823/// @endcode 824std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 825 std::string PathDisplayStr; 826 std::set<unsigned> DisplayedPaths; 827 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 828 Path != Paths.end(); ++Path) { 829 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 830 // We haven't displayed a path to this particular base 831 // class subobject yet. 832 PathDisplayStr += "\n "; 833 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 834 for (CXXBasePath::const_iterator Element = Path->begin(); 835 Element != Path->end(); ++Element) 836 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 837 } 838 } 839 840 return PathDisplayStr; 841} 842 843//===----------------------------------------------------------------------===// 844// C++ class member Handling 845//===----------------------------------------------------------------------===// 846 847/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 848Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 849 SourceLocation ASLoc, 850 SourceLocation ColonLoc) { 851 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 852 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 853 ASLoc, ColonLoc); 854 CurContext->addHiddenDecl(ASDecl); 855 return ASDecl; 856} 857 858/// CheckOverrideControl - Check C++0x override control semantics. 859void Sema::CheckOverrideControl(const Decl *D) { 860 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 861 if (!MD || !MD->isVirtual()) 862 return; 863 864 if (MD->isDependentContext()) 865 return; 866 867 // C++0x [class.virtual]p3: 868 // If a virtual function is marked with the virt-specifier override and does 869 // not override a member function of a base class, 870 // the program is ill-formed. 871 bool HasOverriddenMethods = 872 MD->begin_overridden_methods() != MD->end_overridden_methods(); 873 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 874 Diag(MD->getLocation(), 875 diag::err_function_marked_override_not_overriding) 876 << MD->getDeclName(); 877 return; 878 } 879 880 // C++0x [class.derived]p8: 881 // In a class definition marked with the class-virt-specifier explicit, 882 // if a virtual member function that is neither implicitly-declared nor a 883 // destructor overrides a member function of a base class and it is not 884 // marked with the virt-specifier override, the program is ill-formed. 885 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 886 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 887 llvm::SmallVector<const CXXMethodDecl*, 4> 888 OverriddenMethods(MD->begin_overridden_methods(), 889 MD->end_overridden_methods()); 890 891 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 892 << MD->getDeclName() 893 << (unsigned)OverriddenMethods.size(); 894 895 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 896 Diag(OverriddenMethods[I]->getLocation(), 897 diag::note_overridden_virtual_function); 898 } 899} 900 901/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 902/// function overrides a virtual member function marked 'final', according to 903/// C++0x [class.virtual]p3. 904bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 905 const CXXMethodDecl *Old) { 906 if (!Old->hasAttr<FinalAttr>()) 907 return false; 908 909 Diag(New->getLocation(), diag::err_final_function_overridden) 910 << New->getDeclName(); 911 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 912 return true; 913} 914 915/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 916/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 917/// bitfield width if there is one and 'InitExpr' specifies the initializer if 918/// any. 919Decl * 920Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 921 MultiTemplateParamsArg TemplateParameterLists, 922 ExprTy *BW, const VirtSpecifiers &VS, 923 ExprTy *InitExpr, bool IsDefinition, 924 bool Deleted) { 925 const DeclSpec &DS = D.getDeclSpec(); 926 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 927 DeclarationName Name = NameInfo.getName(); 928 SourceLocation Loc = NameInfo.getLoc(); 929 930 // For anonymous bitfields, the location should point to the type. 931 if (Loc.isInvalid()) 932 Loc = D.getSourceRange().getBegin(); 933 934 Expr *BitWidth = static_cast<Expr*>(BW); 935 Expr *Init = static_cast<Expr*>(InitExpr); 936 937 assert(isa<CXXRecordDecl>(CurContext)); 938 assert(!DS.isFriendSpecified()); 939 940 bool isFunc = false; 941 if (D.isFunctionDeclarator()) 942 isFunc = true; 943 else if (D.getNumTypeObjects() == 0 && 944 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 945 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 946 isFunc = TDType->isFunctionType(); 947 } 948 949 // C++ 9.2p6: A member shall not be declared to have automatic storage 950 // duration (auto, register) or with the extern storage-class-specifier. 951 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 952 // data members and cannot be applied to names declared const or static, 953 // and cannot be applied to reference members. 954 switch (DS.getStorageClassSpec()) { 955 case DeclSpec::SCS_unspecified: 956 case DeclSpec::SCS_typedef: 957 case DeclSpec::SCS_static: 958 // FALL THROUGH. 959 break; 960 case DeclSpec::SCS_mutable: 961 if (isFunc) { 962 if (DS.getStorageClassSpecLoc().isValid()) 963 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 964 else 965 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 966 967 // FIXME: It would be nicer if the keyword was ignored only for this 968 // declarator. Otherwise we could get follow-up errors. 969 D.getMutableDeclSpec().ClearStorageClassSpecs(); 970 } 971 break; 972 default: 973 if (DS.getStorageClassSpecLoc().isValid()) 974 Diag(DS.getStorageClassSpecLoc(), 975 diag::err_storageclass_invalid_for_member); 976 else 977 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 978 D.getMutableDeclSpec().ClearStorageClassSpecs(); 979 } 980 981 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 982 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 983 !isFunc); 984 985 Decl *Member; 986 if (isInstField) { 987 CXXScopeSpec &SS = D.getCXXScopeSpec(); 988 989 990 if (SS.isSet() && !SS.isInvalid()) { 991 // The user provided a superfluous scope specifier inside a class 992 // definition: 993 // 994 // class X { 995 // int X::member; 996 // }; 997 DeclContext *DC = 0; 998 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 999 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1000 << Name << FixItHint::CreateRemoval(SS.getRange()); 1001 else 1002 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1003 << Name << SS.getRange(); 1004 1005 SS.clear(); 1006 } 1007 1008 // FIXME: Check for template parameters! 1009 // FIXME: Check that the name is an identifier! 1010 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1011 AS); 1012 assert(Member && "HandleField never returns null"); 1013 } else { 1014 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1015 if (!Member) { 1016 return 0; 1017 } 1018 1019 // Non-instance-fields can't have a bitfield. 1020 if (BitWidth) { 1021 if (Member->isInvalidDecl()) { 1022 // don't emit another diagnostic. 1023 } else if (isa<VarDecl>(Member)) { 1024 // C++ 9.6p3: A bit-field shall not be a static member. 1025 // "static member 'A' cannot be a bit-field" 1026 Diag(Loc, diag::err_static_not_bitfield) 1027 << Name << BitWidth->getSourceRange(); 1028 } else if (isa<TypedefDecl>(Member)) { 1029 // "typedef member 'x' cannot be a bit-field" 1030 Diag(Loc, diag::err_typedef_not_bitfield) 1031 << Name << BitWidth->getSourceRange(); 1032 } else { 1033 // A function typedef ("typedef int f(); f a;"). 1034 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1035 Diag(Loc, diag::err_not_integral_type_bitfield) 1036 << Name << cast<ValueDecl>(Member)->getType() 1037 << BitWidth->getSourceRange(); 1038 } 1039 1040 BitWidth = 0; 1041 Member->setInvalidDecl(); 1042 } 1043 1044 Member->setAccess(AS); 1045 1046 // If we have declared a member function template, set the access of the 1047 // templated declaration as well. 1048 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1049 FunTmpl->getTemplatedDecl()->setAccess(AS); 1050 } 1051 1052 if (VS.isOverrideSpecified()) { 1053 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1054 if (!MD || !MD->isVirtual()) { 1055 Diag(Member->getLocStart(), 1056 diag::override_keyword_only_allowed_on_virtual_member_functions) 1057 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1058 } else 1059 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1060 } 1061 if (VS.isFinalSpecified()) { 1062 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1063 if (!MD || !MD->isVirtual()) { 1064 Diag(Member->getLocStart(), 1065 diag::override_keyword_only_allowed_on_virtual_member_functions) 1066 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1067 } else 1068 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1069 } 1070 1071 CheckOverrideControl(Member); 1072 1073 assert((Name || isInstField) && "No identifier for non-field ?"); 1074 1075 if (Init) 1076 AddInitializerToDecl(Member, Init, false); 1077 if (Deleted) // FIXME: Source location is not very good. 1078 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1079 1080 if (isInstField) { 1081 FieldCollector->Add(cast<FieldDecl>(Member)); 1082 return 0; 1083 } 1084 return Member; 1085} 1086 1087/// \brief Find the direct and/or virtual base specifiers that 1088/// correspond to the given base type, for use in base initialization 1089/// within a constructor. 1090static bool FindBaseInitializer(Sema &SemaRef, 1091 CXXRecordDecl *ClassDecl, 1092 QualType BaseType, 1093 const CXXBaseSpecifier *&DirectBaseSpec, 1094 const CXXBaseSpecifier *&VirtualBaseSpec) { 1095 // First, check for a direct base class. 1096 DirectBaseSpec = 0; 1097 for (CXXRecordDecl::base_class_const_iterator Base 1098 = ClassDecl->bases_begin(); 1099 Base != ClassDecl->bases_end(); ++Base) { 1100 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1101 // We found a direct base of this type. That's what we're 1102 // initializing. 1103 DirectBaseSpec = &*Base; 1104 break; 1105 } 1106 } 1107 1108 // Check for a virtual base class. 1109 // FIXME: We might be able to short-circuit this if we know in advance that 1110 // there are no virtual bases. 1111 VirtualBaseSpec = 0; 1112 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1113 // We haven't found a base yet; search the class hierarchy for a 1114 // virtual base class. 1115 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1116 /*DetectVirtual=*/false); 1117 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1118 BaseType, Paths)) { 1119 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1120 Path != Paths.end(); ++Path) { 1121 if (Path->back().Base->isVirtual()) { 1122 VirtualBaseSpec = Path->back().Base; 1123 break; 1124 } 1125 } 1126 } 1127 } 1128 1129 return DirectBaseSpec || VirtualBaseSpec; 1130} 1131 1132/// ActOnMemInitializer - Handle a C++ member initializer. 1133MemInitResult 1134Sema::ActOnMemInitializer(Decl *ConstructorD, 1135 Scope *S, 1136 CXXScopeSpec &SS, 1137 IdentifierInfo *MemberOrBase, 1138 ParsedType TemplateTypeTy, 1139 SourceLocation IdLoc, 1140 SourceLocation LParenLoc, 1141 ExprTy **Args, unsigned NumArgs, 1142 SourceLocation RParenLoc, 1143 SourceLocation EllipsisLoc) { 1144 if (!ConstructorD) 1145 return true; 1146 1147 AdjustDeclIfTemplate(ConstructorD); 1148 1149 CXXConstructorDecl *Constructor 1150 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1151 if (!Constructor) { 1152 // The user wrote a constructor initializer on a function that is 1153 // not a C++ constructor. Ignore the error for now, because we may 1154 // have more member initializers coming; we'll diagnose it just 1155 // once in ActOnMemInitializers. 1156 return true; 1157 } 1158 1159 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1160 1161 // C++ [class.base.init]p2: 1162 // Names in a mem-initializer-id are looked up in the scope of the 1163 // constructor's class and, if not found in that scope, are looked 1164 // up in the scope containing the constructor's definition. 1165 // [Note: if the constructor's class contains a member with the 1166 // same name as a direct or virtual base class of the class, a 1167 // mem-initializer-id naming the member or base class and composed 1168 // of a single identifier refers to the class member. A 1169 // mem-initializer-id for the hidden base class may be specified 1170 // using a qualified name. ] 1171 if (!SS.getScopeRep() && !TemplateTypeTy) { 1172 // Look for a member, first. 1173 FieldDecl *Member = 0; 1174 DeclContext::lookup_result Result 1175 = ClassDecl->lookup(MemberOrBase); 1176 if (Result.first != Result.second) { 1177 Member = dyn_cast<FieldDecl>(*Result.first); 1178 1179 if (Member) { 1180 if (EllipsisLoc.isValid()) 1181 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1182 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1183 1184 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1185 LParenLoc, RParenLoc); 1186 } 1187 1188 // Handle anonymous union case. 1189 if (IndirectFieldDecl* IndirectField 1190 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1191 if (EllipsisLoc.isValid()) 1192 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1193 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1194 1195 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1196 NumArgs, IdLoc, 1197 LParenLoc, RParenLoc); 1198 } 1199 } 1200 } 1201 // It didn't name a member, so see if it names a class. 1202 QualType BaseType; 1203 TypeSourceInfo *TInfo = 0; 1204 1205 if (TemplateTypeTy) { 1206 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1207 } else { 1208 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1209 LookupParsedName(R, S, &SS); 1210 1211 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1212 if (!TyD) { 1213 if (R.isAmbiguous()) return true; 1214 1215 // We don't want access-control diagnostics here. 1216 R.suppressDiagnostics(); 1217 1218 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1219 bool NotUnknownSpecialization = false; 1220 DeclContext *DC = computeDeclContext(SS, false); 1221 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1222 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1223 1224 if (!NotUnknownSpecialization) { 1225 // When the scope specifier can refer to a member of an unknown 1226 // specialization, we take it as a type name. 1227 BaseType = CheckTypenameType(ETK_None, 1228 (NestedNameSpecifier *)SS.getScopeRep(), 1229 *MemberOrBase, SourceLocation(), 1230 SS.getRange(), IdLoc); 1231 if (BaseType.isNull()) 1232 return true; 1233 1234 R.clear(); 1235 R.setLookupName(MemberOrBase); 1236 } 1237 } 1238 1239 // If no results were found, try to correct typos. 1240 if (R.empty() && BaseType.isNull() && 1241 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1242 R.isSingleResult()) { 1243 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1244 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1245 // We have found a non-static data member with a similar 1246 // name to what was typed; complain and initialize that 1247 // member. 1248 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1249 << MemberOrBase << true << R.getLookupName() 1250 << FixItHint::CreateReplacement(R.getNameLoc(), 1251 R.getLookupName().getAsString()); 1252 Diag(Member->getLocation(), diag::note_previous_decl) 1253 << Member->getDeclName(); 1254 1255 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1256 LParenLoc, RParenLoc); 1257 } 1258 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1259 const CXXBaseSpecifier *DirectBaseSpec; 1260 const CXXBaseSpecifier *VirtualBaseSpec; 1261 if (FindBaseInitializer(*this, ClassDecl, 1262 Context.getTypeDeclType(Type), 1263 DirectBaseSpec, VirtualBaseSpec)) { 1264 // We have found a direct or virtual base class with a 1265 // similar name to what was typed; complain and initialize 1266 // that base class. 1267 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1268 << MemberOrBase << false << R.getLookupName() 1269 << FixItHint::CreateReplacement(R.getNameLoc(), 1270 R.getLookupName().getAsString()); 1271 1272 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1273 : VirtualBaseSpec; 1274 Diag(BaseSpec->getSourceRange().getBegin(), 1275 diag::note_base_class_specified_here) 1276 << BaseSpec->getType() 1277 << BaseSpec->getSourceRange(); 1278 1279 TyD = Type; 1280 } 1281 } 1282 } 1283 1284 if (!TyD && BaseType.isNull()) { 1285 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1286 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1287 return true; 1288 } 1289 } 1290 1291 if (BaseType.isNull()) { 1292 BaseType = Context.getTypeDeclType(TyD); 1293 if (SS.isSet()) { 1294 NestedNameSpecifier *Qualifier = 1295 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1296 1297 // FIXME: preserve source range information 1298 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1299 } 1300 } 1301 } 1302 1303 if (!TInfo) 1304 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1305 1306 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1307 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1308} 1309 1310/// Checks an initializer expression for use of uninitialized fields, such as 1311/// containing the field that is being initialized. Returns true if there is an 1312/// uninitialized field was used an updates the SourceLocation parameter; false 1313/// otherwise. 1314static bool InitExprContainsUninitializedFields(const Stmt *S, 1315 const ValueDecl *LhsField, 1316 SourceLocation *L) { 1317 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1318 1319 if (isa<CallExpr>(S)) { 1320 // Do not descend into function calls or constructors, as the use 1321 // of an uninitialized field may be valid. One would have to inspect 1322 // the contents of the function/ctor to determine if it is safe or not. 1323 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1324 // may be safe, depending on what the function/ctor does. 1325 return false; 1326 } 1327 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1328 const NamedDecl *RhsField = ME->getMemberDecl(); 1329 1330 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1331 // The member expression points to a static data member. 1332 assert(VD->isStaticDataMember() && 1333 "Member points to non-static data member!"); 1334 (void)VD; 1335 return false; 1336 } 1337 1338 if (isa<EnumConstantDecl>(RhsField)) { 1339 // The member expression points to an enum. 1340 return false; 1341 } 1342 1343 if (RhsField == LhsField) { 1344 // Initializing a field with itself. Throw a warning. 1345 // But wait; there are exceptions! 1346 // Exception #1: The field may not belong to this record. 1347 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1348 const Expr *base = ME->getBase(); 1349 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1350 // Even though the field matches, it does not belong to this record. 1351 return false; 1352 } 1353 // None of the exceptions triggered; return true to indicate an 1354 // uninitialized field was used. 1355 *L = ME->getMemberLoc(); 1356 return true; 1357 } 1358 } else if (isa<SizeOfAlignOfExpr>(S)) { 1359 // sizeof/alignof doesn't reference contents, do not warn. 1360 return false; 1361 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1362 // address-of doesn't reference contents (the pointer may be dereferenced 1363 // in the same expression but it would be rare; and weird). 1364 if (UOE->getOpcode() == UO_AddrOf) 1365 return false; 1366 } 1367 for (Stmt::const_child_range it = S->children(); it; ++it) { 1368 if (!*it) { 1369 // An expression such as 'member(arg ?: "")' may trigger this. 1370 continue; 1371 } 1372 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1373 return true; 1374 } 1375 return false; 1376} 1377 1378MemInitResult 1379Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1380 unsigned NumArgs, SourceLocation IdLoc, 1381 SourceLocation LParenLoc, 1382 SourceLocation RParenLoc) { 1383 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1384 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1385 assert((DirectMember || IndirectMember) && 1386 "Member must be a FieldDecl or IndirectFieldDecl"); 1387 1388 if (Member->isInvalidDecl()) 1389 return true; 1390 1391 // Diagnose value-uses of fields to initialize themselves, e.g. 1392 // foo(foo) 1393 // where foo is not also a parameter to the constructor. 1394 // TODO: implement -Wuninitialized and fold this into that framework. 1395 for (unsigned i = 0; i < NumArgs; ++i) { 1396 SourceLocation L; 1397 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1398 // FIXME: Return true in the case when other fields are used before being 1399 // uninitialized. For example, let this field be the i'th field. When 1400 // initializing the i'th field, throw a warning if any of the >= i'th 1401 // fields are used, as they are not yet initialized. 1402 // Right now we are only handling the case where the i'th field uses 1403 // itself in its initializer. 1404 Diag(L, diag::warn_field_is_uninit); 1405 } 1406 } 1407 1408 bool HasDependentArg = false; 1409 for (unsigned i = 0; i < NumArgs; i++) 1410 HasDependentArg |= Args[i]->isTypeDependent(); 1411 1412 Expr *Init; 1413 if (Member->getType()->isDependentType() || HasDependentArg) { 1414 // Can't check initialization for a member of dependent type or when 1415 // any of the arguments are type-dependent expressions. 1416 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1417 RParenLoc); 1418 1419 // Erase any temporaries within this evaluation context; we're not 1420 // going to track them in the AST, since we'll be rebuilding the 1421 // ASTs during template instantiation. 1422 ExprTemporaries.erase( 1423 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1424 ExprTemporaries.end()); 1425 } else { 1426 // Initialize the member. 1427 InitializedEntity MemberEntity = 1428 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1429 : InitializedEntity::InitializeMember(IndirectMember, 0); 1430 InitializationKind Kind = 1431 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1432 1433 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1434 1435 ExprResult MemberInit = 1436 InitSeq.Perform(*this, MemberEntity, Kind, 1437 MultiExprArg(*this, Args, NumArgs), 0); 1438 if (MemberInit.isInvalid()) 1439 return true; 1440 1441 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1442 1443 // C++0x [class.base.init]p7: 1444 // The initialization of each base and member constitutes a 1445 // full-expression. 1446 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1447 if (MemberInit.isInvalid()) 1448 return true; 1449 1450 // If we are in a dependent context, template instantiation will 1451 // perform this type-checking again. Just save the arguments that we 1452 // received in a ParenListExpr. 1453 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1454 // of the information that we have about the member 1455 // initializer. However, deconstructing the ASTs is a dicey process, 1456 // and this approach is far more likely to get the corner cases right. 1457 if (CurContext->isDependentContext()) 1458 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1459 RParenLoc); 1460 else 1461 Init = MemberInit.get(); 1462 } 1463 1464 if (DirectMember) { 1465 return new (Context) CXXCtorInitializer(Context, DirectMember, 1466 IdLoc, LParenLoc, Init, 1467 RParenLoc); 1468 } else { 1469 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1470 IdLoc, LParenLoc, Init, 1471 RParenLoc); 1472 } 1473} 1474 1475MemInitResult 1476Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1477 Expr **Args, unsigned NumArgs, 1478 SourceLocation LParenLoc, 1479 SourceLocation RParenLoc, 1480 CXXRecordDecl *ClassDecl, 1481 SourceLocation EllipsisLoc) { 1482 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1483 if (!LangOpts.CPlusPlus0x) 1484 return Diag(Loc, diag::err_delegation_0x_only) 1485 << TInfo->getTypeLoc().getLocalSourceRange(); 1486 1487 return Diag(Loc, diag::err_delegation_unimplemented) 1488 << TInfo->getTypeLoc().getLocalSourceRange(); 1489} 1490 1491MemInitResult 1492Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1493 Expr **Args, unsigned NumArgs, 1494 SourceLocation LParenLoc, SourceLocation RParenLoc, 1495 CXXRecordDecl *ClassDecl, 1496 SourceLocation EllipsisLoc) { 1497 bool HasDependentArg = false; 1498 for (unsigned i = 0; i < NumArgs; i++) 1499 HasDependentArg |= Args[i]->isTypeDependent(); 1500 1501 SourceLocation BaseLoc 1502 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1503 1504 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1505 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1506 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1507 1508 // C++ [class.base.init]p2: 1509 // [...] Unless the mem-initializer-id names a nonstatic data 1510 // member of the constructor's class or a direct or virtual base 1511 // of that class, the mem-initializer is ill-formed. A 1512 // mem-initializer-list can initialize a base class using any 1513 // name that denotes that base class type. 1514 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1515 1516 if (EllipsisLoc.isValid()) { 1517 // This is a pack expansion. 1518 if (!BaseType->containsUnexpandedParameterPack()) { 1519 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1520 << SourceRange(BaseLoc, RParenLoc); 1521 1522 EllipsisLoc = SourceLocation(); 1523 } 1524 } else { 1525 // Check for any unexpanded parameter packs. 1526 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1527 return true; 1528 1529 for (unsigned I = 0; I != NumArgs; ++I) 1530 if (DiagnoseUnexpandedParameterPack(Args[I])) 1531 return true; 1532 } 1533 1534 // Check for direct and virtual base classes. 1535 const CXXBaseSpecifier *DirectBaseSpec = 0; 1536 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1537 if (!Dependent) { 1538 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1539 BaseType)) 1540 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, 1541 LParenLoc, RParenLoc, ClassDecl, 1542 EllipsisLoc); 1543 1544 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1545 VirtualBaseSpec); 1546 1547 // C++ [base.class.init]p2: 1548 // Unless the mem-initializer-id names a nonstatic data member of the 1549 // constructor's class or a direct or virtual base of that class, the 1550 // mem-initializer is ill-formed. 1551 if (!DirectBaseSpec && !VirtualBaseSpec) { 1552 // If the class has any dependent bases, then it's possible that 1553 // one of those types will resolve to the same type as 1554 // BaseType. Therefore, just treat this as a dependent base 1555 // class initialization. FIXME: Should we try to check the 1556 // initialization anyway? It seems odd. 1557 if (ClassDecl->hasAnyDependentBases()) 1558 Dependent = true; 1559 else 1560 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1561 << BaseType << Context.getTypeDeclType(ClassDecl) 1562 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1563 } 1564 } 1565 1566 if (Dependent) { 1567 // Can't check initialization for a base of dependent type or when 1568 // any of the arguments are type-dependent expressions. 1569 ExprResult BaseInit 1570 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1571 RParenLoc)); 1572 1573 // Erase any temporaries within this evaluation context; we're not 1574 // going to track them in the AST, since we'll be rebuilding the 1575 // ASTs during template instantiation. 1576 ExprTemporaries.erase( 1577 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1578 ExprTemporaries.end()); 1579 1580 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1581 /*IsVirtual=*/false, 1582 LParenLoc, 1583 BaseInit.takeAs<Expr>(), 1584 RParenLoc, 1585 EllipsisLoc); 1586 } 1587 1588 // C++ [base.class.init]p2: 1589 // If a mem-initializer-id is ambiguous because it designates both 1590 // a direct non-virtual base class and an inherited virtual base 1591 // class, the mem-initializer is ill-formed. 1592 if (DirectBaseSpec && VirtualBaseSpec) 1593 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1594 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1595 1596 CXXBaseSpecifier *BaseSpec 1597 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1598 if (!BaseSpec) 1599 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1600 1601 // Initialize the base. 1602 InitializedEntity BaseEntity = 1603 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1604 InitializationKind Kind = 1605 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1606 1607 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1608 1609 ExprResult BaseInit = 1610 InitSeq.Perform(*this, BaseEntity, Kind, 1611 MultiExprArg(*this, Args, NumArgs), 0); 1612 if (BaseInit.isInvalid()) 1613 return true; 1614 1615 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1616 1617 // C++0x [class.base.init]p7: 1618 // The initialization of each base and member constitutes a 1619 // full-expression. 1620 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1621 if (BaseInit.isInvalid()) 1622 return true; 1623 1624 // If we are in a dependent context, template instantiation will 1625 // perform this type-checking again. Just save the arguments that we 1626 // received in a ParenListExpr. 1627 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1628 // of the information that we have about the base 1629 // initializer. However, deconstructing the ASTs is a dicey process, 1630 // and this approach is far more likely to get the corner cases right. 1631 if (CurContext->isDependentContext()) { 1632 ExprResult Init 1633 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1634 RParenLoc)); 1635 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1636 BaseSpec->isVirtual(), 1637 LParenLoc, 1638 Init.takeAs<Expr>(), 1639 RParenLoc, 1640 EllipsisLoc); 1641 } 1642 1643 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1644 BaseSpec->isVirtual(), 1645 LParenLoc, 1646 BaseInit.takeAs<Expr>(), 1647 RParenLoc, 1648 EllipsisLoc); 1649} 1650 1651/// ImplicitInitializerKind - How an implicit base or member initializer should 1652/// initialize its base or member. 1653enum ImplicitInitializerKind { 1654 IIK_Default, 1655 IIK_Copy, 1656 IIK_Move 1657}; 1658 1659static bool 1660BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1661 ImplicitInitializerKind ImplicitInitKind, 1662 CXXBaseSpecifier *BaseSpec, 1663 bool IsInheritedVirtualBase, 1664 CXXCtorInitializer *&CXXBaseInit) { 1665 InitializedEntity InitEntity 1666 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1667 IsInheritedVirtualBase); 1668 1669 ExprResult BaseInit; 1670 1671 switch (ImplicitInitKind) { 1672 case IIK_Default: { 1673 InitializationKind InitKind 1674 = InitializationKind::CreateDefault(Constructor->getLocation()); 1675 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1676 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1677 MultiExprArg(SemaRef, 0, 0)); 1678 break; 1679 } 1680 1681 case IIK_Copy: { 1682 ParmVarDecl *Param = Constructor->getParamDecl(0); 1683 QualType ParamType = Param->getType().getNonReferenceType(); 1684 1685 Expr *CopyCtorArg = 1686 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1687 Constructor->getLocation(), ParamType, 1688 VK_LValue, 0); 1689 1690 // Cast to the base class to avoid ambiguities. 1691 QualType ArgTy = 1692 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1693 ParamType.getQualifiers()); 1694 1695 CXXCastPath BasePath; 1696 BasePath.push_back(BaseSpec); 1697 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1698 CK_UncheckedDerivedToBase, 1699 VK_LValue, &BasePath); 1700 1701 InitializationKind InitKind 1702 = InitializationKind::CreateDirect(Constructor->getLocation(), 1703 SourceLocation(), SourceLocation()); 1704 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1705 &CopyCtorArg, 1); 1706 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1707 MultiExprArg(&CopyCtorArg, 1)); 1708 break; 1709 } 1710 1711 case IIK_Move: 1712 assert(false && "Unhandled initializer kind!"); 1713 } 1714 1715 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1716 if (BaseInit.isInvalid()) 1717 return true; 1718 1719 CXXBaseInit = 1720 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1721 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1722 SourceLocation()), 1723 BaseSpec->isVirtual(), 1724 SourceLocation(), 1725 BaseInit.takeAs<Expr>(), 1726 SourceLocation(), 1727 SourceLocation()); 1728 1729 return false; 1730} 1731 1732static bool 1733BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1734 ImplicitInitializerKind ImplicitInitKind, 1735 FieldDecl *Field, 1736 CXXCtorInitializer *&CXXMemberInit) { 1737 if (Field->isInvalidDecl()) 1738 return true; 1739 1740 SourceLocation Loc = Constructor->getLocation(); 1741 1742 if (ImplicitInitKind == IIK_Copy) { 1743 ParmVarDecl *Param = Constructor->getParamDecl(0); 1744 QualType ParamType = Param->getType().getNonReferenceType(); 1745 1746 Expr *MemberExprBase = 1747 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1748 Loc, ParamType, VK_LValue, 0); 1749 1750 // Build a reference to this field within the parameter. 1751 CXXScopeSpec SS; 1752 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1753 Sema::LookupMemberName); 1754 MemberLookup.addDecl(Field, AS_public); 1755 MemberLookup.resolveKind(); 1756 ExprResult CopyCtorArg 1757 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1758 ParamType, Loc, 1759 /*IsArrow=*/false, 1760 SS, 1761 /*FirstQualifierInScope=*/0, 1762 MemberLookup, 1763 /*TemplateArgs=*/0); 1764 if (CopyCtorArg.isInvalid()) 1765 return true; 1766 1767 // When the field we are copying is an array, create index variables for 1768 // each dimension of the array. We use these index variables to subscript 1769 // the source array, and other clients (e.g., CodeGen) will perform the 1770 // necessary iteration with these index variables. 1771 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1772 QualType BaseType = Field->getType(); 1773 QualType SizeType = SemaRef.Context.getSizeType(); 1774 while (const ConstantArrayType *Array 1775 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1776 // Create the iteration variable for this array index. 1777 IdentifierInfo *IterationVarName = 0; 1778 { 1779 llvm::SmallString<8> Str; 1780 llvm::raw_svector_ostream OS(Str); 1781 OS << "__i" << IndexVariables.size(); 1782 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1783 } 1784 VarDecl *IterationVar 1785 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1786 IterationVarName, SizeType, 1787 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1788 SC_None, SC_None); 1789 IndexVariables.push_back(IterationVar); 1790 1791 // Create a reference to the iteration variable. 1792 ExprResult IterationVarRef 1793 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1794 assert(!IterationVarRef.isInvalid() && 1795 "Reference to invented variable cannot fail!"); 1796 1797 // Subscript the array with this iteration variable. 1798 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1799 Loc, 1800 IterationVarRef.take(), 1801 Loc); 1802 if (CopyCtorArg.isInvalid()) 1803 return true; 1804 1805 BaseType = Array->getElementType(); 1806 } 1807 1808 // Construct the entity that we will be initializing. For an array, this 1809 // will be first element in the array, which may require several levels 1810 // of array-subscript entities. 1811 llvm::SmallVector<InitializedEntity, 4> Entities; 1812 Entities.reserve(1 + IndexVariables.size()); 1813 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1814 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1815 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1816 0, 1817 Entities.back())); 1818 1819 // Direct-initialize to use the copy constructor. 1820 InitializationKind InitKind = 1821 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1822 1823 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1824 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1825 &CopyCtorArgE, 1); 1826 1827 ExprResult MemberInit 1828 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1829 MultiExprArg(&CopyCtorArgE, 1)); 1830 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1831 if (MemberInit.isInvalid()) 1832 return true; 1833 1834 CXXMemberInit 1835 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1836 MemberInit.takeAs<Expr>(), Loc, 1837 IndexVariables.data(), 1838 IndexVariables.size()); 1839 return false; 1840 } 1841 1842 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1843 1844 QualType FieldBaseElementType = 1845 SemaRef.Context.getBaseElementType(Field->getType()); 1846 1847 if (FieldBaseElementType->isRecordType()) { 1848 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1849 InitializationKind InitKind = 1850 InitializationKind::CreateDefault(Loc); 1851 1852 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1853 ExprResult MemberInit = 1854 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1855 1856 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1857 if (MemberInit.isInvalid()) 1858 return true; 1859 1860 CXXMemberInit = 1861 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1862 Field, Loc, Loc, 1863 MemberInit.get(), 1864 Loc); 1865 return false; 1866 } 1867 1868 if (FieldBaseElementType->isReferenceType()) { 1869 SemaRef.Diag(Constructor->getLocation(), 1870 diag::err_uninitialized_member_in_ctor) 1871 << (int)Constructor->isImplicit() 1872 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1873 << 0 << Field->getDeclName(); 1874 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1875 return true; 1876 } 1877 1878 if (FieldBaseElementType.isConstQualified()) { 1879 SemaRef.Diag(Constructor->getLocation(), 1880 diag::err_uninitialized_member_in_ctor) 1881 << (int)Constructor->isImplicit() 1882 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1883 << 1 << Field->getDeclName(); 1884 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1885 return true; 1886 } 1887 1888 // Nothing to initialize. 1889 CXXMemberInit = 0; 1890 return false; 1891} 1892 1893namespace { 1894struct BaseAndFieldInfo { 1895 Sema &S; 1896 CXXConstructorDecl *Ctor; 1897 bool AnyErrorsInInits; 1898 ImplicitInitializerKind IIK; 1899 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1900 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1901 1902 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1903 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1904 // FIXME: Handle implicit move constructors. 1905 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1906 IIK = IIK_Copy; 1907 else 1908 IIK = IIK_Default; 1909 } 1910}; 1911} 1912 1913static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1914 FieldDecl *Top, FieldDecl *Field) { 1915 1916 // Overwhelmingly common case: we have a direct initializer for this field. 1917 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1918 Info.AllToInit.push_back(Init); 1919 return false; 1920 } 1921 1922 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1923 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1924 assert(FieldClassType && "anonymous struct/union without record type"); 1925 CXXRecordDecl *FieldClassDecl 1926 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1927 1928 // Even though union members never have non-trivial default 1929 // constructions in C++03, we still build member initializers for aggregate 1930 // record types which can be union members, and C++0x allows non-trivial 1931 // default constructors for union members, so we ensure that only one 1932 // member is initialized for these. 1933 if (FieldClassDecl->isUnion()) { 1934 // First check for an explicit initializer for one field. 1935 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1936 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1937 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1938 Info.AllToInit.push_back(Init); 1939 1940 // Once we've initialized a field of an anonymous union, the union 1941 // field in the class is also initialized, so exit immediately. 1942 return false; 1943 } else if ((*FA)->isAnonymousStructOrUnion()) { 1944 if (CollectFieldInitializer(Info, Top, *FA)) 1945 return true; 1946 } 1947 } 1948 1949 // Fallthrough and construct a default initializer for the union as 1950 // a whole, which can call its default constructor if such a thing exists 1951 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1952 // behavior going forward with C++0x, when anonymous unions there are 1953 // finalized, we should revisit this. 1954 } else { 1955 // For structs, we simply descend through to initialize all members where 1956 // necessary. 1957 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1958 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1959 if (CollectFieldInitializer(Info, Top, *FA)) 1960 return true; 1961 } 1962 } 1963 } 1964 1965 // Don't try to build an implicit initializer if there were semantic 1966 // errors in any of the initializers (and therefore we might be 1967 // missing some that the user actually wrote). 1968 if (Info.AnyErrorsInInits) 1969 return false; 1970 1971 CXXCtorInitializer *Init = 0; 1972 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1973 return true; 1974 1975 if (Init) 1976 Info.AllToInit.push_back(Init); 1977 1978 return false; 1979} 1980 1981bool 1982Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 1983 CXXCtorInitializer **Initializers, 1984 unsigned NumInitializers, 1985 bool AnyErrors) { 1986 if (Constructor->getDeclContext()->isDependentContext()) { 1987 // Just store the initializers as written, they will be checked during 1988 // instantiation. 1989 if (NumInitializers > 0) { 1990 Constructor->setNumCtorInitializers(NumInitializers); 1991 CXXCtorInitializer **baseOrMemberInitializers = 1992 new (Context) CXXCtorInitializer*[NumInitializers]; 1993 memcpy(baseOrMemberInitializers, Initializers, 1994 NumInitializers * sizeof(CXXCtorInitializer*)); 1995 Constructor->setCtorInitializers(baseOrMemberInitializers); 1996 } 1997 1998 return false; 1999 } 2000 2001 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2002 2003 // We need to build the initializer AST according to order of construction 2004 // and not what user specified in the Initializers list. 2005 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2006 if (!ClassDecl) 2007 return true; 2008 2009 bool HadError = false; 2010 2011 for (unsigned i = 0; i < NumInitializers; i++) { 2012 CXXCtorInitializer *Member = Initializers[i]; 2013 2014 if (Member->isBaseInitializer()) 2015 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2016 else 2017 Info.AllBaseFields[Member->getAnyMember()] = Member; 2018 } 2019 2020 // Keep track of the direct virtual bases. 2021 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2022 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2023 E = ClassDecl->bases_end(); I != E; ++I) { 2024 if (I->isVirtual()) 2025 DirectVBases.insert(I); 2026 } 2027 2028 // Push virtual bases before others. 2029 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2030 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2031 2032 if (CXXCtorInitializer *Value 2033 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2034 Info.AllToInit.push_back(Value); 2035 } else if (!AnyErrors) { 2036 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2037 CXXCtorInitializer *CXXBaseInit; 2038 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2039 VBase, IsInheritedVirtualBase, 2040 CXXBaseInit)) { 2041 HadError = true; 2042 continue; 2043 } 2044 2045 Info.AllToInit.push_back(CXXBaseInit); 2046 } 2047 } 2048 2049 // Non-virtual bases. 2050 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2051 E = ClassDecl->bases_end(); Base != E; ++Base) { 2052 // Virtuals are in the virtual base list and already constructed. 2053 if (Base->isVirtual()) 2054 continue; 2055 2056 if (CXXCtorInitializer *Value 2057 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2058 Info.AllToInit.push_back(Value); 2059 } else if (!AnyErrors) { 2060 CXXCtorInitializer *CXXBaseInit; 2061 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2062 Base, /*IsInheritedVirtualBase=*/false, 2063 CXXBaseInit)) { 2064 HadError = true; 2065 continue; 2066 } 2067 2068 Info.AllToInit.push_back(CXXBaseInit); 2069 } 2070 } 2071 2072 // Fields. 2073 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2074 E = ClassDecl->field_end(); Field != E; ++Field) { 2075 if ((*Field)->getType()->isIncompleteArrayType()) { 2076 assert(ClassDecl->hasFlexibleArrayMember() && 2077 "Incomplete array type is not valid"); 2078 continue; 2079 } 2080 if (CollectFieldInitializer(Info, *Field, *Field)) 2081 HadError = true; 2082 } 2083 2084 NumInitializers = Info.AllToInit.size(); 2085 if (NumInitializers > 0) { 2086 Constructor->setNumCtorInitializers(NumInitializers); 2087 CXXCtorInitializer **baseOrMemberInitializers = 2088 new (Context) CXXCtorInitializer*[NumInitializers]; 2089 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2090 NumInitializers * sizeof(CXXCtorInitializer*)); 2091 Constructor->setCtorInitializers(baseOrMemberInitializers); 2092 2093 // Constructors implicitly reference the base and member 2094 // destructors. 2095 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2096 Constructor->getParent()); 2097 } 2098 2099 return HadError; 2100} 2101 2102static void *GetKeyForTopLevelField(FieldDecl *Field) { 2103 // For anonymous unions, use the class declaration as the key. 2104 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2105 if (RT->getDecl()->isAnonymousStructOrUnion()) 2106 return static_cast<void *>(RT->getDecl()); 2107 } 2108 return static_cast<void *>(Field); 2109} 2110 2111static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2112 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2113} 2114 2115static void *GetKeyForMember(ASTContext &Context, 2116 CXXCtorInitializer *Member) { 2117 if (!Member->isAnyMemberInitializer()) 2118 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2119 2120 // For fields injected into the class via declaration of an anonymous union, 2121 // use its anonymous union class declaration as the unique key. 2122 FieldDecl *Field = Member->getAnyMember(); 2123 2124 // If the field is a member of an anonymous struct or union, our key 2125 // is the anonymous record decl that's a direct child of the class. 2126 RecordDecl *RD = Field->getParent(); 2127 if (RD->isAnonymousStructOrUnion()) { 2128 while (true) { 2129 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2130 if (Parent->isAnonymousStructOrUnion()) 2131 RD = Parent; 2132 else 2133 break; 2134 } 2135 2136 return static_cast<void *>(RD); 2137 } 2138 2139 return static_cast<void *>(Field); 2140} 2141 2142static void 2143DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2144 const CXXConstructorDecl *Constructor, 2145 CXXCtorInitializer **Inits, 2146 unsigned NumInits) { 2147 if (Constructor->getDeclContext()->isDependentContext()) 2148 return; 2149 2150 // Don't check initializers order unless the warning is enabled at the 2151 // location of at least one initializer. 2152 bool ShouldCheckOrder = false; 2153 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2154 CXXCtorInitializer *Init = Inits[InitIndex]; 2155 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2156 Init->getSourceLocation()) 2157 != Diagnostic::Ignored) { 2158 ShouldCheckOrder = true; 2159 break; 2160 } 2161 } 2162 if (!ShouldCheckOrder) 2163 return; 2164 2165 // Build the list of bases and members in the order that they'll 2166 // actually be initialized. The explicit initializers should be in 2167 // this same order but may be missing things. 2168 llvm::SmallVector<const void*, 32> IdealInitKeys; 2169 2170 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2171 2172 // 1. Virtual bases. 2173 for (CXXRecordDecl::base_class_const_iterator VBase = 2174 ClassDecl->vbases_begin(), 2175 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2176 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2177 2178 // 2. Non-virtual bases. 2179 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2180 E = ClassDecl->bases_end(); Base != E; ++Base) { 2181 if (Base->isVirtual()) 2182 continue; 2183 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2184 } 2185 2186 // 3. Direct fields. 2187 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2188 E = ClassDecl->field_end(); Field != E; ++Field) 2189 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2190 2191 unsigned NumIdealInits = IdealInitKeys.size(); 2192 unsigned IdealIndex = 0; 2193 2194 CXXCtorInitializer *PrevInit = 0; 2195 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2196 CXXCtorInitializer *Init = Inits[InitIndex]; 2197 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2198 2199 // Scan forward to try to find this initializer in the idealized 2200 // initializers list. 2201 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2202 if (InitKey == IdealInitKeys[IdealIndex]) 2203 break; 2204 2205 // If we didn't find this initializer, it must be because we 2206 // scanned past it on a previous iteration. That can only 2207 // happen if we're out of order; emit a warning. 2208 if (IdealIndex == NumIdealInits && PrevInit) { 2209 Sema::SemaDiagnosticBuilder D = 2210 SemaRef.Diag(PrevInit->getSourceLocation(), 2211 diag::warn_initializer_out_of_order); 2212 2213 if (PrevInit->isAnyMemberInitializer()) 2214 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2215 else 2216 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2217 2218 if (Init->isAnyMemberInitializer()) 2219 D << 0 << Init->getAnyMember()->getDeclName(); 2220 else 2221 D << 1 << Init->getBaseClassInfo()->getType(); 2222 2223 // Move back to the initializer's location in the ideal list. 2224 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2225 if (InitKey == IdealInitKeys[IdealIndex]) 2226 break; 2227 2228 assert(IdealIndex != NumIdealInits && 2229 "initializer not found in initializer list"); 2230 } 2231 2232 PrevInit = Init; 2233 } 2234} 2235 2236namespace { 2237bool CheckRedundantInit(Sema &S, 2238 CXXCtorInitializer *Init, 2239 CXXCtorInitializer *&PrevInit) { 2240 if (!PrevInit) { 2241 PrevInit = Init; 2242 return false; 2243 } 2244 2245 if (FieldDecl *Field = Init->getMember()) 2246 S.Diag(Init->getSourceLocation(), 2247 diag::err_multiple_mem_initialization) 2248 << Field->getDeclName() 2249 << Init->getSourceRange(); 2250 else { 2251 const Type *BaseClass = Init->getBaseClass(); 2252 assert(BaseClass && "neither field nor base"); 2253 S.Diag(Init->getSourceLocation(), 2254 diag::err_multiple_base_initialization) 2255 << QualType(BaseClass, 0) 2256 << Init->getSourceRange(); 2257 } 2258 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2259 << 0 << PrevInit->getSourceRange(); 2260 2261 return true; 2262} 2263 2264typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2265typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2266 2267bool CheckRedundantUnionInit(Sema &S, 2268 CXXCtorInitializer *Init, 2269 RedundantUnionMap &Unions) { 2270 FieldDecl *Field = Init->getAnyMember(); 2271 RecordDecl *Parent = Field->getParent(); 2272 if (!Parent->isAnonymousStructOrUnion()) 2273 return false; 2274 2275 NamedDecl *Child = Field; 2276 do { 2277 if (Parent->isUnion()) { 2278 UnionEntry &En = Unions[Parent]; 2279 if (En.first && En.first != Child) { 2280 S.Diag(Init->getSourceLocation(), 2281 diag::err_multiple_mem_union_initialization) 2282 << Field->getDeclName() 2283 << Init->getSourceRange(); 2284 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2285 << 0 << En.second->getSourceRange(); 2286 return true; 2287 } else if (!En.first) { 2288 En.first = Child; 2289 En.second = Init; 2290 } 2291 } 2292 2293 Child = Parent; 2294 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2295 } while (Parent->isAnonymousStructOrUnion()); 2296 2297 return false; 2298} 2299} 2300 2301/// ActOnMemInitializers - Handle the member initializers for a constructor. 2302void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2303 SourceLocation ColonLoc, 2304 MemInitTy **meminits, unsigned NumMemInits, 2305 bool AnyErrors) { 2306 if (!ConstructorDecl) 2307 return; 2308 2309 AdjustDeclIfTemplate(ConstructorDecl); 2310 2311 CXXConstructorDecl *Constructor 2312 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2313 2314 if (!Constructor) { 2315 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2316 return; 2317 } 2318 2319 CXXCtorInitializer **MemInits = 2320 reinterpret_cast<CXXCtorInitializer **>(meminits); 2321 2322 // Mapping for the duplicate initializers check. 2323 // For member initializers, this is keyed with a FieldDecl*. 2324 // For base initializers, this is keyed with a Type*. 2325 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2326 2327 // Mapping for the inconsistent anonymous-union initializers check. 2328 RedundantUnionMap MemberUnions; 2329 2330 bool HadError = false; 2331 for (unsigned i = 0; i < NumMemInits; i++) { 2332 CXXCtorInitializer *Init = MemInits[i]; 2333 2334 // Set the source order index. 2335 Init->setSourceOrder(i); 2336 2337 if (Init->isAnyMemberInitializer()) { 2338 FieldDecl *Field = Init->getAnyMember(); 2339 if (CheckRedundantInit(*this, Init, Members[Field]) || 2340 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2341 HadError = true; 2342 } else { 2343 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2344 if (CheckRedundantInit(*this, Init, Members[Key])) 2345 HadError = true; 2346 } 2347 } 2348 2349 if (HadError) 2350 return; 2351 2352 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2353 2354 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2355} 2356 2357void 2358Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2359 CXXRecordDecl *ClassDecl) { 2360 // Ignore dependent contexts. 2361 if (ClassDecl->isDependentContext()) 2362 return; 2363 2364 // FIXME: all the access-control diagnostics are positioned on the 2365 // field/base declaration. That's probably good; that said, the 2366 // user might reasonably want to know why the destructor is being 2367 // emitted, and we currently don't say. 2368 2369 // Non-static data members. 2370 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2371 E = ClassDecl->field_end(); I != E; ++I) { 2372 FieldDecl *Field = *I; 2373 if (Field->isInvalidDecl()) 2374 continue; 2375 QualType FieldType = Context.getBaseElementType(Field->getType()); 2376 2377 const RecordType* RT = FieldType->getAs<RecordType>(); 2378 if (!RT) 2379 continue; 2380 2381 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2382 if (FieldClassDecl->hasTrivialDestructor()) 2383 continue; 2384 2385 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2386 CheckDestructorAccess(Field->getLocation(), Dtor, 2387 PDiag(diag::err_access_dtor_field) 2388 << Field->getDeclName() 2389 << FieldType); 2390 2391 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2392 } 2393 2394 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2395 2396 // Bases. 2397 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2398 E = ClassDecl->bases_end(); Base != E; ++Base) { 2399 // Bases are always records in a well-formed non-dependent class. 2400 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2401 2402 // Remember direct virtual bases. 2403 if (Base->isVirtual()) 2404 DirectVirtualBases.insert(RT); 2405 2406 // Ignore trivial destructors. 2407 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2408 if (BaseClassDecl->hasTrivialDestructor()) 2409 continue; 2410 2411 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2412 2413 // FIXME: caret should be on the start of the class name 2414 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2415 PDiag(diag::err_access_dtor_base) 2416 << Base->getType() 2417 << Base->getSourceRange()); 2418 2419 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2420 } 2421 2422 // Virtual bases. 2423 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2424 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2425 2426 // Bases are always records in a well-formed non-dependent class. 2427 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2428 2429 // Ignore direct virtual bases. 2430 if (DirectVirtualBases.count(RT)) 2431 continue; 2432 2433 // Ignore trivial destructors. 2434 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2435 if (BaseClassDecl->hasTrivialDestructor()) 2436 continue; 2437 2438 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2439 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2440 PDiag(diag::err_access_dtor_vbase) 2441 << VBase->getType()); 2442 2443 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2444 } 2445} 2446 2447void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2448 if (!CDtorDecl) 2449 return; 2450 2451 if (CXXConstructorDecl *Constructor 2452 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2453 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2454} 2455 2456bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2457 unsigned DiagID, AbstractDiagSelID SelID) { 2458 if (SelID == -1) 2459 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2460 else 2461 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2462} 2463 2464bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2465 const PartialDiagnostic &PD) { 2466 if (!getLangOptions().CPlusPlus) 2467 return false; 2468 2469 if (const ArrayType *AT = Context.getAsArrayType(T)) 2470 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2471 2472 if (const PointerType *PT = T->getAs<PointerType>()) { 2473 // Find the innermost pointer type. 2474 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2475 PT = T; 2476 2477 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2478 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2479 } 2480 2481 const RecordType *RT = T->getAs<RecordType>(); 2482 if (!RT) 2483 return false; 2484 2485 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2486 2487 // We can't answer whether something is abstract until it has a 2488 // definition. If it's currently being defined, we'll walk back 2489 // over all the declarations when we have a full definition. 2490 const CXXRecordDecl *Def = RD->getDefinition(); 2491 if (!Def || Def->isBeingDefined()) 2492 return false; 2493 2494 if (!RD->isAbstract()) 2495 return false; 2496 2497 Diag(Loc, PD) << RD->getDeclName(); 2498 DiagnoseAbstractType(RD); 2499 2500 return true; 2501} 2502 2503void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2504 // Check if we've already emitted the list of pure virtual functions 2505 // for this class. 2506 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2507 return; 2508 2509 CXXFinalOverriderMap FinalOverriders; 2510 RD->getFinalOverriders(FinalOverriders); 2511 2512 // Keep a set of seen pure methods so we won't diagnose the same method 2513 // more than once. 2514 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2515 2516 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2517 MEnd = FinalOverriders.end(); 2518 M != MEnd; 2519 ++M) { 2520 for (OverridingMethods::iterator SO = M->second.begin(), 2521 SOEnd = M->second.end(); 2522 SO != SOEnd; ++SO) { 2523 // C++ [class.abstract]p4: 2524 // A class is abstract if it contains or inherits at least one 2525 // pure virtual function for which the final overrider is pure 2526 // virtual. 2527 2528 // 2529 if (SO->second.size() != 1) 2530 continue; 2531 2532 if (!SO->second.front().Method->isPure()) 2533 continue; 2534 2535 if (!SeenPureMethods.insert(SO->second.front().Method)) 2536 continue; 2537 2538 Diag(SO->second.front().Method->getLocation(), 2539 diag::note_pure_virtual_function) 2540 << SO->second.front().Method->getDeclName(); 2541 } 2542 } 2543 2544 if (!PureVirtualClassDiagSet) 2545 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2546 PureVirtualClassDiagSet->insert(RD); 2547} 2548 2549namespace { 2550struct AbstractUsageInfo { 2551 Sema &S; 2552 CXXRecordDecl *Record; 2553 CanQualType AbstractType; 2554 bool Invalid; 2555 2556 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2557 : S(S), Record(Record), 2558 AbstractType(S.Context.getCanonicalType( 2559 S.Context.getTypeDeclType(Record))), 2560 Invalid(false) {} 2561 2562 void DiagnoseAbstractType() { 2563 if (Invalid) return; 2564 S.DiagnoseAbstractType(Record); 2565 Invalid = true; 2566 } 2567 2568 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2569}; 2570 2571struct CheckAbstractUsage { 2572 AbstractUsageInfo &Info; 2573 const NamedDecl *Ctx; 2574 2575 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2576 : Info(Info), Ctx(Ctx) {} 2577 2578 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2579 switch (TL.getTypeLocClass()) { 2580#define ABSTRACT_TYPELOC(CLASS, PARENT) 2581#define TYPELOC(CLASS, PARENT) \ 2582 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2583#include "clang/AST/TypeLocNodes.def" 2584 } 2585 } 2586 2587 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2588 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2589 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2590 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2591 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2592 } 2593 } 2594 2595 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2596 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2597 } 2598 2599 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2600 // Visit the type parameters from a permissive context. 2601 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2602 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2603 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2604 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2605 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2606 // TODO: other template argument types? 2607 } 2608 } 2609 2610 // Visit pointee types from a permissive context. 2611#define CheckPolymorphic(Type) \ 2612 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2613 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2614 } 2615 CheckPolymorphic(PointerTypeLoc) 2616 CheckPolymorphic(ReferenceTypeLoc) 2617 CheckPolymorphic(MemberPointerTypeLoc) 2618 CheckPolymorphic(BlockPointerTypeLoc) 2619 2620 /// Handle all the types we haven't given a more specific 2621 /// implementation for above. 2622 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2623 // Every other kind of type that we haven't called out already 2624 // that has an inner type is either (1) sugar or (2) contains that 2625 // inner type in some way as a subobject. 2626 if (TypeLoc Next = TL.getNextTypeLoc()) 2627 return Visit(Next, Sel); 2628 2629 // If there's no inner type and we're in a permissive context, 2630 // don't diagnose. 2631 if (Sel == Sema::AbstractNone) return; 2632 2633 // Check whether the type matches the abstract type. 2634 QualType T = TL.getType(); 2635 if (T->isArrayType()) { 2636 Sel = Sema::AbstractArrayType; 2637 T = Info.S.Context.getBaseElementType(T); 2638 } 2639 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2640 if (CT != Info.AbstractType) return; 2641 2642 // It matched; do some magic. 2643 if (Sel == Sema::AbstractArrayType) { 2644 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2645 << T << TL.getSourceRange(); 2646 } else { 2647 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2648 << Sel << T << TL.getSourceRange(); 2649 } 2650 Info.DiagnoseAbstractType(); 2651 } 2652}; 2653 2654void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2655 Sema::AbstractDiagSelID Sel) { 2656 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2657} 2658 2659} 2660 2661/// Check for invalid uses of an abstract type in a method declaration. 2662static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2663 CXXMethodDecl *MD) { 2664 // No need to do the check on definitions, which require that 2665 // the return/param types be complete. 2666 if (MD->isThisDeclarationADefinition()) 2667 return; 2668 2669 // For safety's sake, just ignore it if we don't have type source 2670 // information. This should never happen for non-implicit methods, 2671 // but... 2672 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2673 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2674} 2675 2676/// Check for invalid uses of an abstract type within a class definition. 2677static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2678 CXXRecordDecl *RD) { 2679 for (CXXRecordDecl::decl_iterator 2680 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2681 Decl *D = *I; 2682 if (D->isImplicit()) continue; 2683 2684 // Methods and method templates. 2685 if (isa<CXXMethodDecl>(D)) { 2686 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2687 } else if (isa<FunctionTemplateDecl>(D)) { 2688 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2689 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2690 2691 // Fields and static variables. 2692 } else if (isa<FieldDecl>(D)) { 2693 FieldDecl *FD = cast<FieldDecl>(D); 2694 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2695 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2696 } else if (isa<VarDecl>(D)) { 2697 VarDecl *VD = cast<VarDecl>(D); 2698 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2699 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2700 2701 // Nested classes and class templates. 2702 } else if (isa<CXXRecordDecl>(D)) { 2703 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2704 } else if (isa<ClassTemplateDecl>(D)) { 2705 CheckAbstractClassUsage(Info, 2706 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2707 } 2708 } 2709} 2710 2711/// \brief Perform semantic checks on a class definition that has been 2712/// completing, introducing implicitly-declared members, checking for 2713/// abstract types, etc. 2714void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2715 if (!Record) 2716 return; 2717 2718 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2719 AbstractUsageInfo Info(*this, Record); 2720 CheckAbstractClassUsage(Info, Record); 2721 } 2722 2723 // If this is not an aggregate type and has no user-declared constructor, 2724 // complain about any non-static data members of reference or const scalar 2725 // type, since they will never get initializers. 2726 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2727 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2728 bool Complained = false; 2729 for (RecordDecl::field_iterator F = Record->field_begin(), 2730 FEnd = Record->field_end(); 2731 F != FEnd; ++F) { 2732 if (F->getType()->isReferenceType() || 2733 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2734 if (!Complained) { 2735 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2736 << Record->getTagKind() << Record; 2737 Complained = true; 2738 } 2739 2740 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2741 << F->getType()->isReferenceType() 2742 << F->getDeclName(); 2743 } 2744 } 2745 } 2746 2747 if (Record->isDynamicClass() && !Record->isDependentType()) 2748 DynamicClasses.push_back(Record); 2749 2750 if (Record->getIdentifier()) { 2751 // C++ [class.mem]p13: 2752 // If T is the name of a class, then each of the following shall have a 2753 // name different from T: 2754 // - every member of every anonymous union that is a member of class T. 2755 // 2756 // C++ [class.mem]p14: 2757 // In addition, if class T has a user-declared constructor (12.1), every 2758 // non-static data member of class T shall have a name different from T. 2759 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2760 R.first != R.second; ++R.first) { 2761 NamedDecl *D = *R.first; 2762 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2763 isa<IndirectFieldDecl>(D)) { 2764 Diag(D->getLocation(), diag::err_member_name_of_class) 2765 << D->getDeclName(); 2766 break; 2767 } 2768 } 2769 } 2770 2771 // Warn if the class has virtual methods but non-virtual public destructor. 2772 if (Record->isDynamicClass() && !Record->isDependentType()) { 2773 CXXDestructorDecl *dtor = Record->getDestructor(); 2774 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2775 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2776 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2777 } 2778 2779 // See if a method overloads virtual methods in a base 2780 /// class without overriding any. 2781 if (!Record->isDependentType()) { 2782 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2783 MEnd = Record->method_end(); 2784 M != MEnd; ++M) { 2785 DiagnoseHiddenVirtualMethods(Record, *M); 2786 } 2787 } 2788 2789 // Declare inherited constructors. We do this eagerly here because: 2790 // - The standard requires an eager diagnostic for conflicting inherited 2791 // constructors from different classes. 2792 // - The lazy declaration of the other implicit constructors is so as to not 2793 // waste space and performance on classes that are not meant to be 2794 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2795 // have inherited constructors. 2796 DeclareInheritedConstructors(Record); 2797} 2798 2799/// \brief Data used with FindHiddenVirtualMethod 2800struct FindHiddenVirtualMethodData { 2801 Sema *S; 2802 CXXMethodDecl *Method; 2803 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2804 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2805}; 2806 2807/// \brief Member lookup function that determines whether a given C++ 2808/// method overloads virtual methods in a base class without overriding any, 2809/// to be used with CXXRecordDecl::lookupInBases(). 2810static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2811 CXXBasePath &Path, 2812 void *UserData) { 2813 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2814 2815 FindHiddenVirtualMethodData &Data 2816 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2817 2818 DeclarationName Name = Data.Method->getDeclName(); 2819 assert(Name.getNameKind() == DeclarationName::Identifier); 2820 2821 bool foundSameNameMethod = false; 2822 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2823 for (Path.Decls = BaseRecord->lookup(Name); 2824 Path.Decls.first != Path.Decls.second; 2825 ++Path.Decls.first) { 2826 NamedDecl *D = *Path.Decls.first; 2827 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2828 MD = MD->getCanonicalDecl(); 2829 foundSameNameMethod = true; 2830 // Interested only in hidden virtual methods. 2831 if (!MD->isVirtual()) 2832 continue; 2833 // If the method we are checking overrides a method from its base 2834 // don't warn about the other overloaded methods. 2835 if (!Data.S->IsOverload(Data.Method, MD, false)) 2836 return true; 2837 // Collect the overload only if its hidden. 2838 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2839 overloadedMethods.push_back(MD); 2840 } 2841 } 2842 2843 if (foundSameNameMethod) 2844 Data.OverloadedMethods.append(overloadedMethods.begin(), 2845 overloadedMethods.end()); 2846 return foundSameNameMethod; 2847} 2848 2849/// \brief See if a method overloads virtual methods in a base class without 2850/// overriding any. 2851void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2852 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2853 MD->getLocation()) == Diagnostic::Ignored) 2854 return; 2855 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2856 return; 2857 2858 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2859 /*bool RecordPaths=*/false, 2860 /*bool DetectVirtual=*/false); 2861 FindHiddenVirtualMethodData Data; 2862 Data.Method = MD; 2863 Data.S = this; 2864 2865 // Keep the base methods that were overriden or introduced in the subclass 2866 // by 'using' in a set. A base method not in this set is hidden. 2867 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2868 res.first != res.second; ++res.first) { 2869 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2870 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2871 E = MD->end_overridden_methods(); 2872 I != E; ++I) 2873 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2874 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2875 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2876 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2877 } 2878 2879 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2880 !Data.OverloadedMethods.empty()) { 2881 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2882 << MD << (Data.OverloadedMethods.size() > 1); 2883 2884 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2885 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2886 Diag(overloadedMD->getLocation(), 2887 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2888 } 2889 } 2890} 2891 2892void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2893 Decl *TagDecl, 2894 SourceLocation LBrac, 2895 SourceLocation RBrac, 2896 AttributeList *AttrList) { 2897 if (!TagDecl) 2898 return; 2899 2900 AdjustDeclIfTemplate(TagDecl); 2901 2902 ActOnFields(S, RLoc, TagDecl, 2903 // strict aliasing violation! 2904 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2905 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2906 2907 CheckCompletedCXXClass( 2908 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2909} 2910 2911namespace { 2912 /// \brief Helper class that collects exception specifications for 2913 /// implicitly-declared special member functions. 2914 class ImplicitExceptionSpecification { 2915 ASTContext &Context; 2916 bool AllowsAllExceptions; 2917 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2918 llvm::SmallVector<QualType, 4> Exceptions; 2919 2920 public: 2921 explicit ImplicitExceptionSpecification(ASTContext &Context) 2922 : Context(Context), AllowsAllExceptions(false) { } 2923 2924 /// \brief Whether the special member function should have any 2925 /// exception specification at all. 2926 bool hasExceptionSpecification() const { 2927 return !AllowsAllExceptions; 2928 } 2929 2930 /// \brief Whether the special member function should have a 2931 /// throw(...) exception specification (a Microsoft extension). 2932 bool hasAnyExceptionSpecification() const { 2933 return false; 2934 } 2935 2936 /// \brief The number of exceptions in the exception specification. 2937 unsigned size() const { return Exceptions.size(); } 2938 2939 /// \brief The set of exceptions in the exception specification. 2940 const QualType *data() const { return Exceptions.data(); } 2941 2942 /// \brief Note that 2943 void CalledDecl(CXXMethodDecl *Method) { 2944 // If we already know that we allow all exceptions, do nothing. 2945 if (AllowsAllExceptions || !Method) 2946 return; 2947 2948 const FunctionProtoType *Proto 2949 = Method->getType()->getAs<FunctionProtoType>(); 2950 2951 // If this function can throw any exceptions, make a note of that. 2952 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2953 AllowsAllExceptions = true; 2954 ExceptionsSeen.clear(); 2955 Exceptions.clear(); 2956 return; 2957 } 2958 2959 // Record the exceptions in this function's exception specification. 2960 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2961 EEnd = Proto->exception_end(); 2962 E != EEnd; ++E) 2963 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2964 Exceptions.push_back(*E); 2965 } 2966 }; 2967} 2968 2969 2970/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2971/// special functions, such as the default constructor, copy 2972/// constructor, or destructor, to the given C++ class (C++ 2973/// [special]p1). This routine can only be executed just before the 2974/// definition of the class is complete. 2975void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2976 if (!ClassDecl->hasUserDeclaredConstructor()) 2977 ++ASTContext::NumImplicitDefaultConstructors; 2978 2979 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2980 ++ASTContext::NumImplicitCopyConstructors; 2981 2982 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2983 ++ASTContext::NumImplicitCopyAssignmentOperators; 2984 2985 // If we have a dynamic class, then the copy assignment operator may be 2986 // virtual, so we have to declare it immediately. This ensures that, e.g., 2987 // it shows up in the right place in the vtable and that we diagnose 2988 // problems with the implicit exception specification. 2989 if (ClassDecl->isDynamicClass()) 2990 DeclareImplicitCopyAssignment(ClassDecl); 2991 } 2992 2993 if (!ClassDecl->hasUserDeclaredDestructor()) { 2994 ++ASTContext::NumImplicitDestructors; 2995 2996 // If we have a dynamic class, then the destructor may be virtual, so we 2997 // have to declare the destructor immediately. This ensures that, e.g., it 2998 // shows up in the right place in the vtable and that we diagnose problems 2999 // with the implicit exception specification. 3000 if (ClassDecl->isDynamicClass()) 3001 DeclareImplicitDestructor(ClassDecl); 3002 } 3003} 3004 3005void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3006 if (!D) 3007 return; 3008 3009 TemplateParameterList *Params = 0; 3010 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3011 Params = Template->getTemplateParameters(); 3012 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3013 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3014 Params = PartialSpec->getTemplateParameters(); 3015 else 3016 return; 3017 3018 for (TemplateParameterList::iterator Param = Params->begin(), 3019 ParamEnd = Params->end(); 3020 Param != ParamEnd; ++Param) { 3021 NamedDecl *Named = cast<NamedDecl>(*Param); 3022 if (Named->getDeclName()) { 3023 S->AddDecl(Named); 3024 IdResolver.AddDecl(Named); 3025 } 3026 } 3027} 3028 3029void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3030 if (!RecordD) return; 3031 AdjustDeclIfTemplate(RecordD); 3032 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3033 PushDeclContext(S, Record); 3034} 3035 3036void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3037 if (!RecordD) return; 3038 PopDeclContext(); 3039} 3040 3041/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3042/// parsing a top-level (non-nested) C++ class, and we are now 3043/// parsing those parts of the given Method declaration that could 3044/// not be parsed earlier (C++ [class.mem]p2), such as default 3045/// arguments. This action should enter the scope of the given 3046/// Method declaration as if we had just parsed the qualified method 3047/// name. However, it should not bring the parameters into scope; 3048/// that will be performed by ActOnDelayedCXXMethodParameter. 3049void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3050} 3051 3052/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3053/// C++ method declaration. We're (re-)introducing the given 3054/// function parameter into scope for use in parsing later parts of 3055/// the method declaration. For example, we could see an 3056/// ActOnParamDefaultArgument event for this parameter. 3057void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3058 if (!ParamD) 3059 return; 3060 3061 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3062 3063 // If this parameter has an unparsed default argument, clear it out 3064 // to make way for the parsed default argument. 3065 if (Param->hasUnparsedDefaultArg()) 3066 Param->setDefaultArg(0); 3067 3068 S->AddDecl(Param); 3069 if (Param->getDeclName()) 3070 IdResolver.AddDecl(Param); 3071} 3072 3073/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3074/// processing the delayed method declaration for Method. The method 3075/// declaration is now considered finished. There may be a separate 3076/// ActOnStartOfFunctionDef action later (not necessarily 3077/// immediately!) for this method, if it was also defined inside the 3078/// class body. 3079void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3080 if (!MethodD) 3081 return; 3082 3083 AdjustDeclIfTemplate(MethodD); 3084 3085 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3086 3087 // Now that we have our default arguments, check the constructor 3088 // again. It could produce additional diagnostics or affect whether 3089 // the class has implicitly-declared destructors, among other 3090 // things. 3091 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3092 CheckConstructor(Constructor); 3093 3094 // Check the default arguments, which we may have added. 3095 if (!Method->isInvalidDecl()) 3096 CheckCXXDefaultArguments(Method); 3097} 3098 3099/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3100/// the well-formedness of the constructor declarator @p D with type @p 3101/// R. If there are any errors in the declarator, this routine will 3102/// emit diagnostics and set the invalid bit to true. In any case, the type 3103/// will be updated to reflect a well-formed type for the constructor and 3104/// returned. 3105QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3106 StorageClass &SC) { 3107 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3108 3109 // C++ [class.ctor]p3: 3110 // A constructor shall not be virtual (10.3) or static (9.4). A 3111 // constructor can be invoked for a const, volatile or const 3112 // volatile object. A constructor shall not be declared const, 3113 // volatile, or const volatile (9.3.2). 3114 if (isVirtual) { 3115 if (!D.isInvalidType()) 3116 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3117 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3118 << SourceRange(D.getIdentifierLoc()); 3119 D.setInvalidType(); 3120 } 3121 if (SC == SC_Static) { 3122 if (!D.isInvalidType()) 3123 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3124 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3125 << SourceRange(D.getIdentifierLoc()); 3126 D.setInvalidType(); 3127 SC = SC_None; 3128 } 3129 3130 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3131 if (FTI.TypeQuals != 0) { 3132 if (FTI.TypeQuals & Qualifiers::Const) 3133 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3134 << "const" << SourceRange(D.getIdentifierLoc()); 3135 if (FTI.TypeQuals & Qualifiers::Volatile) 3136 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3137 << "volatile" << SourceRange(D.getIdentifierLoc()); 3138 if (FTI.TypeQuals & Qualifiers::Restrict) 3139 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3140 << "restrict" << SourceRange(D.getIdentifierLoc()); 3141 D.setInvalidType(); 3142 } 3143 3144 // C++0x [class.ctor]p4: 3145 // A constructor shall not be declared with a ref-qualifier. 3146 if (FTI.hasRefQualifier()) { 3147 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3148 << FTI.RefQualifierIsLValueRef 3149 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3150 D.setInvalidType(); 3151 } 3152 3153 // Rebuild the function type "R" without any type qualifiers (in 3154 // case any of the errors above fired) and with "void" as the 3155 // return type, since constructors don't have return types. 3156 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3157 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3158 return R; 3159 3160 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3161 EPI.TypeQuals = 0; 3162 EPI.RefQualifier = RQ_None; 3163 3164 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3165 Proto->getNumArgs(), EPI); 3166} 3167 3168/// CheckConstructor - Checks a fully-formed constructor for 3169/// well-formedness, issuing any diagnostics required. Returns true if 3170/// the constructor declarator is invalid. 3171void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3172 CXXRecordDecl *ClassDecl 3173 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3174 if (!ClassDecl) 3175 return Constructor->setInvalidDecl(); 3176 3177 // C++ [class.copy]p3: 3178 // A declaration of a constructor for a class X is ill-formed if 3179 // its first parameter is of type (optionally cv-qualified) X and 3180 // either there are no other parameters or else all other 3181 // parameters have default arguments. 3182 if (!Constructor->isInvalidDecl() && 3183 ((Constructor->getNumParams() == 1) || 3184 (Constructor->getNumParams() > 1 && 3185 Constructor->getParamDecl(1)->hasDefaultArg())) && 3186 Constructor->getTemplateSpecializationKind() 3187 != TSK_ImplicitInstantiation) { 3188 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3189 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3190 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3191 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3192 const char *ConstRef 3193 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3194 : " const &"; 3195 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3196 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3197 3198 // FIXME: Rather that making the constructor invalid, we should endeavor 3199 // to fix the type. 3200 Constructor->setInvalidDecl(); 3201 } 3202 } 3203} 3204 3205/// CheckDestructor - Checks a fully-formed destructor definition for 3206/// well-formedness, issuing any diagnostics required. Returns true 3207/// on error. 3208bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3209 CXXRecordDecl *RD = Destructor->getParent(); 3210 3211 if (Destructor->isVirtual()) { 3212 SourceLocation Loc; 3213 3214 if (!Destructor->isImplicit()) 3215 Loc = Destructor->getLocation(); 3216 else 3217 Loc = RD->getLocation(); 3218 3219 // If we have a virtual destructor, look up the deallocation function 3220 FunctionDecl *OperatorDelete = 0; 3221 DeclarationName Name = 3222 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3223 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3224 return true; 3225 3226 MarkDeclarationReferenced(Loc, OperatorDelete); 3227 3228 Destructor->setOperatorDelete(OperatorDelete); 3229 } 3230 3231 return false; 3232} 3233 3234static inline bool 3235FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3236 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3237 FTI.ArgInfo[0].Param && 3238 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3239} 3240 3241/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3242/// the well-formednes of the destructor declarator @p D with type @p 3243/// R. If there are any errors in the declarator, this routine will 3244/// emit diagnostics and set the declarator to invalid. Even if this happens, 3245/// will be updated to reflect a well-formed type for the destructor and 3246/// returned. 3247QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3248 StorageClass& SC) { 3249 // C++ [class.dtor]p1: 3250 // [...] A typedef-name that names a class is a class-name 3251 // (7.1.3); however, a typedef-name that names a class shall not 3252 // be used as the identifier in the declarator for a destructor 3253 // declaration. 3254 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3255 if (isa<TypedefType>(DeclaratorType)) 3256 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3257 << DeclaratorType; 3258 3259 // C++ [class.dtor]p2: 3260 // A destructor is used to destroy objects of its class type. A 3261 // destructor takes no parameters, and no return type can be 3262 // specified for it (not even void). The address of a destructor 3263 // shall not be taken. A destructor shall not be static. A 3264 // destructor can be invoked for a const, volatile or const 3265 // volatile object. A destructor shall not be declared const, 3266 // volatile or const volatile (9.3.2). 3267 if (SC == SC_Static) { 3268 if (!D.isInvalidType()) 3269 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3270 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3271 << SourceRange(D.getIdentifierLoc()) 3272 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3273 3274 SC = SC_None; 3275 } 3276 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3277 // Destructors don't have return types, but the parser will 3278 // happily parse something like: 3279 // 3280 // class X { 3281 // float ~X(); 3282 // }; 3283 // 3284 // The return type will be eliminated later. 3285 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3286 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3287 << SourceRange(D.getIdentifierLoc()); 3288 } 3289 3290 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3291 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3292 if (FTI.TypeQuals & Qualifiers::Const) 3293 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3294 << "const" << SourceRange(D.getIdentifierLoc()); 3295 if (FTI.TypeQuals & Qualifiers::Volatile) 3296 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3297 << "volatile" << SourceRange(D.getIdentifierLoc()); 3298 if (FTI.TypeQuals & Qualifiers::Restrict) 3299 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3300 << "restrict" << SourceRange(D.getIdentifierLoc()); 3301 D.setInvalidType(); 3302 } 3303 3304 // C++0x [class.dtor]p2: 3305 // A destructor shall not be declared with a ref-qualifier. 3306 if (FTI.hasRefQualifier()) { 3307 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3308 << FTI.RefQualifierIsLValueRef 3309 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3310 D.setInvalidType(); 3311 } 3312 3313 // Make sure we don't have any parameters. 3314 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3315 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3316 3317 // Delete the parameters. 3318 FTI.freeArgs(); 3319 D.setInvalidType(); 3320 } 3321 3322 // Make sure the destructor isn't variadic. 3323 if (FTI.isVariadic) { 3324 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3325 D.setInvalidType(); 3326 } 3327 3328 // Rebuild the function type "R" without any type qualifiers or 3329 // parameters (in case any of the errors above fired) and with 3330 // "void" as the return type, since destructors don't have return 3331 // types. 3332 if (!D.isInvalidType()) 3333 return R; 3334 3335 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3336 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3337 EPI.Variadic = false; 3338 EPI.TypeQuals = 0; 3339 EPI.RefQualifier = RQ_None; 3340 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3341} 3342 3343/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3344/// well-formednes of the conversion function declarator @p D with 3345/// type @p R. If there are any errors in the declarator, this routine 3346/// will emit diagnostics and return true. Otherwise, it will return 3347/// false. Either way, the type @p R will be updated to reflect a 3348/// well-formed type for the conversion operator. 3349void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3350 StorageClass& SC) { 3351 // C++ [class.conv.fct]p1: 3352 // Neither parameter types nor return type can be specified. The 3353 // type of a conversion function (8.3.5) is "function taking no 3354 // parameter returning conversion-type-id." 3355 if (SC == SC_Static) { 3356 if (!D.isInvalidType()) 3357 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3358 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3359 << SourceRange(D.getIdentifierLoc()); 3360 D.setInvalidType(); 3361 SC = SC_None; 3362 } 3363 3364 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3365 3366 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3367 // Conversion functions don't have return types, but the parser will 3368 // happily parse something like: 3369 // 3370 // class X { 3371 // float operator bool(); 3372 // }; 3373 // 3374 // The return type will be changed later anyway. 3375 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3376 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3377 << SourceRange(D.getIdentifierLoc()); 3378 D.setInvalidType(); 3379 } 3380 3381 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3382 3383 // Make sure we don't have any parameters. 3384 if (Proto->getNumArgs() > 0) { 3385 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3386 3387 // Delete the parameters. 3388 D.getFunctionTypeInfo().freeArgs(); 3389 D.setInvalidType(); 3390 } else if (Proto->isVariadic()) { 3391 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3392 D.setInvalidType(); 3393 } 3394 3395 // Diagnose "&operator bool()" and other such nonsense. This 3396 // is actually a gcc extension which we don't support. 3397 if (Proto->getResultType() != ConvType) { 3398 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3399 << Proto->getResultType(); 3400 D.setInvalidType(); 3401 ConvType = Proto->getResultType(); 3402 } 3403 3404 // C++ [class.conv.fct]p4: 3405 // The conversion-type-id shall not represent a function type nor 3406 // an array type. 3407 if (ConvType->isArrayType()) { 3408 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3409 ConvType = Context.getPointerType(ConvType); 3410 D.setInvalidType(); 3411 } else if (ConvType->isFunctionType()) { 3412 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3413 ConvType = Context.getPointerType(ConvType); 3414 D.setInvalidType(); 3415 } 3416 3417 // Rebuild the function type "R" without any parameters (in case any 3418 // of the errors above fired) and with the conversion type as the 3419 // return type. 3420 if (D.isInvalidType()) 3421 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3422 3423 // C++0x explicit conversion operators. 3424 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3425 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3426 diag::warn_explicit_conversion_functions) 3427 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3428} 3429 3430/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3431/// the declaration of the given C++ conversion function. This routine 3432/// is responsible for recording the conversion function in the C++ 3433/// class, if possible. 3434Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3435 assert(Conversion && "Expected to receive a conversion function declaration"); 3436 3437 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3438 3439 // Make sure we aren't redeclaring the conversion function. 3440 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3441 3442 // C++ [class.conv.fct]p1: 3443 // [...] A conversion function is never used to convert a 3444 // (possibly cv-qualified) object to the (possibly cv-qualified) 3445 // same object type (or a reference to it), to a (possibly 3446 // cv-qualified) base class of that type (or a reference to it), 3447 // or to (possibly cv-qualified) void. 3448 // FIXME: Suppress this warning if the conversion function ends up being a 3449 // virtual function that overrides a virtual function in a base class. 3450 QualType ClassType 3451 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3452 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3453 ConvType = ConvTypeRef->getPointeeType(); 3454 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3455 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3456 /* Suppress diagnostics for instantiations. */; 3457 else if (ConvType->isRecordType()) { 3458 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3459 if (ConvType == ClassType) 3460 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3461 << ClassType; 3462 else if (IsDerivedFrom(ClassType, ConvType)) 3463 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3464 << ClassType << ConvType; 3465 } else if (ConvType->isVoidType()) { 3466 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3467 << ClassType << ConvType; 3468 } 3469 3470 if (FunctionTemplateDecl *ConversionTemplate 3471 = Conversion->getDescribedFunctionTemplate()) 3472 return ConversionTemplate; 3473 3474 return Conversion; 3475} 3476 3477//===----------------------------------------------------------------------===// 3478// Namespace Handling 3479//===----------------------------------------------------------------------===// 3480 3481 3482 3483/// ActOnStartNamespaceDef - This is called at the start of a namespace 3484/// definition. 3485Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3486 SourceLocation InlineLoc, 3487 SourceLocation IdentLoc, 3488 IdentifierInfo *II, 3489 SourceLocation LBrace, 3490 AttributeList *AttrList) { 3491 // anonymous namespace starts at its left brace 3492 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3493 (II ? IdentLoc : LBrace) , II); 3494 Namespc->setLBracLoc(LBrace); 3495 Namespc->setInline(InlineLoc.isValid()); 3496 3497 Scope *DeclRegionScope = NamespcScope->getParent(); 3498 3499 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3500 3501 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3502 PushNamespaceVisibilityAttr(Attr); 3503 3504 if (II) { 3505 // C++ [namespace.def]p2: 3506 // The identifier in an original-namespace-definition shall not 3507 // have been previously defined in the declarative region in 3508 // which the original-namespace-definition appears. The 3509 // identifier in an original-namespace-definition is the name of 3510 // the namespace. Subsequently in that declarative region, it is 3511 // treated as an original-namespace-name. 3512 // 3513 // Since namespace names are unique in their scope, and we don't 3514 // look through using directives, just 3515 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3516 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3517 3518 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3519 // This is an extended namespace definition. 3520 if (Namespc->isInline() != OrigNS->isInline()) { 3521 // inline-ness must match 3522 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3523 << Namespc->isInline(); 3524 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3525 Namespc->setInvalidDecl(); 3526 // Recover by ignoring the new namespace's inline status. 3527 Namespc->setInline(OrigNS->isInline()); 3528 } 3529 3530 // Attach this namespace decl to the chain of extended namespace 3531 // definitions. 3532 OrigNS->setNextNamespace(Namespc); 3533 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3534 3535 // Remove the previous declaration from the scope. 3536 if (DeclRegionScope->isDeclScope(OrigNS)) { 3537 IdResolver.RemoveDecl(OrigNS); 3538 DeclRegionScope->RemoveDecl(OrigNS); 3539 } 3540 } else if (PrevDecl) { 3541 // This is an invalid name redefinition. 3542 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3543 << Namespc->getDeclName(); 3544 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3545 Namespc->setInvalidDecl(); 3546 // Continue on to push Namespc as current DeclContext and return it. 3547 } else if (II->isStr("std") && 3548 CurContext->getRedeclContext()->isTranslationUnit()) { 3549 // This is the first "real" definition of the namespace "std", so update 3550 // our cache of the "std" namespace to point at this definition. 3551 if (NamespaceDecl *StdNS = getStdNamespace()) { 3552 // We had already defined a dummy namespace "std". Link this new 3553 // namespace definition to the dummy namespace "std". 3554 StdNS->setNextNamespace(Namespc); 3555 StdNS->setLocation(IdentLoc); 3556 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3557 } 3558 3559 // Make our StdNamespace cache point at the first real definition of the 3560 // "std" namespace. 3561 StdNamespace = Namespc; 3562 } 3563 3564 PushOnScopeChains(Namespc, DeclRegionScope); 3565 } else { 3566 // Anonymous namespaces. 3567 assert(Namespc->isAnonymousNamespace()); 3568 3569 // Link the anonymous namespace into its parent. 3570 NamespaceDecl *PrevDecl; 3571 DeclContext *Parent = CurContext->getRedeclContext(); 3572 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3573 PrevDecl = TU->getAnonymousNamespace(); 3574 TU->setAnonymousNamespace(Namespc); 3575 } else { 3576 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3577 PrevDecl = ND->getAnonymousNamespace(); 3578 ND->setAnonymousNamespace(Namespc); 3579 } 3580 3581 // Link the anonymous namespace with its previous declaration. 3582 if (PrevDecl) { 3583 assert(PrevDecl->isAnonymousNamespace()); 3584 assert(!PrevDecl->getNextNamespace()); 3585 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3586 PrevDecl->setNextNamespace(Namespc); 3587 3588 if (Namespc->isInline() != PrevDecl->isInline()) { 3589 // inline-ness must match 3590 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3591 << Namespc->isInline(); 3592 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3593 Namespc->setInvalidDecl(); 3594 // Recover by ignoring the new namespace's inline status. 3595 Namespc->setInline(PrevDecl->isInline()); 3596 } 3597 } 3598 3599 CurContext->addDecl(Namespc); 3600 3601 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3602 // behaves as if it were replaced by 3603 // namespace unique { /* empty body */ } 3604 // using namespace unique; 3605 // namespace unique { namespace-body } 3606 // where all occurrences of 'unique' in a translation unit are 3607 // replaced by the same identifier and this identifier differs 3608 // from all other identifiers in the entire program. 3609 3610 // We just create the namespace with an empty name and then add an 3611 // implicit using declaration, just like the standard suggests. 3612 // 3613 // CodeGen enforces the "universally unique" aspect by giving all 3614 // declarations semantically contained within an anonymous 3615 // namespace internal linkage. 3616 3617 if (!PrevDecl) { 3618 UsingDirectiveDecl* UD 3619 = UsingDirectiveDecl::Create(Context, CurContext, 3620 /* 'using' */ LBrace, 3621 /* 'namespace' */ SourceLocation(), 3622 /* qualifier */ SourceRange(), 3623 /* NNS */ NULL, 3624 /* identifier */ SourceLocation(), 3625 Namespc, 3626 /* Ancestor */ CurContext); 3627 UD->setImplicit(); 3628 CurContext->addDecl(UD); 3629 } 3630 } 3631 3632 // Although we could have an invalid decl (i.e. the namespace name is a 3633 // redefinition), push it as current DeclContext and try to continue parsing. 3634 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3635 // for the namespace has the declarations that showed up in that particular 3636 // namespace definition. 3637 PushDeclContext(NamespcScope, Namespc); 3638 return Namespc; 3639} 3640 3641/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3642/// is a namespace alias, returns the namespace it points to. 3643static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3644 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3645 return AD->getNamespace(); 3646 return dyn_cast_or_null<NamespaceDecl>(D); 3647} 3648 3649/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3650/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3651void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3652 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3653 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3654 Namespc->setRBracLoc(RBrace); 3655 PopDeclContext(); 3656 if (Namespc->hasAttr<VisibilityAttr>()) 3657 PopPragmaVisibility(); 3658} 3659 3660CXXRecordDecl *Sema::getStdBadAlloc() const { 3661 return cast_or_null<CXXRecordDecl>( 3662 StdBadAlloc.get(Context.getExternalSource())); 3663} 3664 3665NamespaceDecl *Sema::getStdNamespace() const { 3666 return cast_or_null<NamespaceDecl>( 3667 StdNamespace.get(Context.getExternalSource())); 3668} 3669 3670/// \brief Retrieve the special "std" namespace, which may require us to 3671/// implicitly define the namespace. 3672NamespaceDecl *Sema::getOrCreateStdNamespace() { 3673 if (!StdNamespace) { 3674 // The "std" namespace has not yet been defined, so build one implicitly. 3675 StdNamespace = NamespaceDecl::Create(Context, 3676 Context.getTranslationUnitDecl(), 3677 SourceLocation(), 3678 &PP.getIdentifierTable().get("std")); 3679 getStdNamespace()->setImplicit(true); 3680 } 3681 3682 return getStdNamespace(); 3683} 3684 3685Decl *Sema::ActOnUsingDirective(Scope *S, 3686 SourceLocation UsingLoc, 3687 SourceLocation NamespcLoc, 3688 CXXScopeSpec &SS, 3689 SourceLocation IdentLoc, 3690 IdentifierInfo *NamespcName, 3691 AttributeList *AttrList) { 3692 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3693 assert(NamespcName && "Invalid NamespcName."); 3694 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3695 3696 // This can only happen along a recovery path. 3697 while (S->getFlags() & Scope::TemplateParamScope) 3698 S = S->getParent(); 3699 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3700 3701 UsingDirectiveDecl *UDir = 0; 3702 NestedNameSpecifier *Qualifier = 0; 3703 if (SS.isSet()) 3704 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3705 3706 // Lookup namespace name. 3707 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3708 LookupParsedName(R, S, &SS); 3709 if (R.isAmbiguous()) 3710 return 0; 3711 3712 if (R.empty()) { 3713 // Allow "using namespace std;" or "using namespace ::std;" even if 3714 // "std" hasn't been defined yet, for GCC compatibility. 3715 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3716 NamespcName->isStr("std")) { 3717 Diag(IdentLoc, diag::ext_using_undefined_std); 3718 R.addDecl(getOrCreateStdNamespace()); 3719 R.resolveKind(); 3720 } 3721 // Otherwise, attempt typo correction. 3722 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3723 CTC_NoKeywords, 0)) { 3724 if (R.getAsSingle<NamespaceDecl>() || 3725 R.getAsSingle<NamespaceAliasDecl>()) { 3726 if (DeclContext *DC = computeDeclContext(SS, false)) 3727 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3728 << NamespcName << DC << Corrected << SS.getRange() 3729 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3730 else 3731 Diag(IdentLoc, diag::err_using_directive_suggest) 3732 << NamespcName << Corrected 3733 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3734 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3735 << Corrected; 3736 3737 NamespcName = Corrected.getAsIdentifierInfo(); 3738 } else { 3739 R.clear(); 3740 R.setLookupName(NamespcName); 3741 } 3742 } 3743 } 3744 3745 if (!R.empty()) { 3746 NamedDecl *Named = R.getFoundDecl(); 3747 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3748 && "expected namespace decl"); 3749 // C++ [namespace.udir]p1: 3750 // A using-directive specifies that the names in the nominated 3751 // namespace can be used in the scope in which the 3752 // using-directive appears after the using-directive. During 3753 // unqualified name lookup (3.4.1), the names appear as if they 3754 // were declared in the nearest enclosing namespace which 3755 // contains both the using-directive and the nominated 3756 // namespace. [Note: in this context, "contains" means "contains 3757 // directly or indirectly". ] 3758 3759 // Find enclosing context containing both using-directive and 3760 // nominated namespace. 3761 NamespaceDecl *NS = getNamespaceDecl(Named); 3762 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3763 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3764 CommonAncestor = CommonAncestor->getParent(); 3765 3766 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3767 SS.getRange(), 3768 (NestedNameSpecifier *)SS.getScopeRep(), 3769 IdentLoc, Named, CommonAncestor); 3770 PushUsingDirective(S, UDir); 3771 } else { 3772 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3773 } 3774 3775 // FIXME: We ignore attributes for now. 3776 return UDir; 3777} 3778 3779void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3780 // If scope has associated entity, then using directive is at namespace 3781 // or translation unit scope. We add UsingDirectiveDecls, into 3782 // it's lookup structure. 3783 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3784 Ctx->addDecl(UDir); 3785 else 3786 // Otherwise it is block-sope. using-directives will affect lookup 3787 // only to the end of scope. 3788 S->PushUsingDirective(UDir); 3789} 3790 3791 3792Decl *Sema::ActOnUsingDeclaration(Scope *S, 3793 AccessSpecifier AS, 3794 bool HasUsingKeyword, 3795 SourceLocation UsingLoc, 3796 CXXScopeSpec &SS, 3797 UnqualifiedId &Name, 3798 AttributeList *AttrList, 3799 bool IsTypeName, 3800 SourceLocation TypenameLoc) { 3801 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3802 3803 switch (Name.getKind()) { 3804 case UnqualifiedId::IK_Identifier: 3805 case UnqualifiedId::IK_OperatorFunctionId: 3806 case UnqualifiedId::IK_LiteralOperatorId: 3807 case UnqualifiedId::IK_ConversionFunctionId: 3808 break; 3809 3810 case UnqualifiedId::IK_ConstructorName: 3811 case UnqualifiedId::IK_ConstructorTemplateId: 3812 // C++0x inherited constructors. 3813 if (getLangOptions().CPlusPlus0x) break; 3814 3815 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3816 << SS.getRange(); 3817 return 0; 3818 3819 case UnqualifiedId::IK_DestructorName: 3820 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3821 << SS.getRange(); 3822 return 0; 3823 3824 case UnqualifiedId::IK_TemplateId: 3825 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3826 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3827 return 0; 3828 } 3829 3830 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3831 DeclarationName TargetName = TargetNameInfo.getName(); 3832 if (!TargetName) 3833 return 0; 3834 3835 // Warn about using declarations. 3836 // TODO: store that the declaration was written without 'using' and 3837 // talk about access decls instead of using decls in the 3838 // diagnostics. 3839 if (!HasUsingKeyword) { 3840 UsingLoc = Name.getSourceRange().getBegin(); 3841 3842 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3843 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3844 } 3845 3846 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3847 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3848 return 0; 3849 3850 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3851 TargetNameInfo, AttrList, 3852 /* IsInstantiation */ false, 3853 IsTypeName, TypenameLoc); 3854 if (UD) 3855 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3856 3857 return UD; 3858} 3859 3860/// \brief Determine whether a using declaration considers the given 3861/// declarations as "equivalent", e.g., if they are redeclarations of 3862/// the same entity or are both typedefs of the same type. 3863static bool 3864IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3865 bool &SuppressRedeclaration) { 3866 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3867 SuppressRedeclaration = false; 3868 return true; 3869 } 3870 3871 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3872 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3873 SuppressRedeclaration = true; 3874 return Context.hasSameType(TD1->getUnderlyingType(), 3875 TD2->getUnderlyingType()); 3876 } 3877 3878 return false; 3879} 3880 3881 3882/// Determines whether to create a using shadow decl for a particular 3883/// decl, given the set of decls existing prior to this using lookup. 3884bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3885 const LookupResult &Previous) { 3886 // Diagnose finding a decl which is not from a base class of the 3887 // current class. We do this now because there are cases where this 3888 // function will silently decide not to build a shadow decl, which 3889 // will pre-empt further diagnostics. 3890 // 3891 // We don't need to do this in C++0x because we do the check once on 3892 // the qualifier. 3893 // 3894 // FIXME: diagnose the following if we care enough: 3895 // struct A { int foo; }; 3896 // struct B : A { using A::foo; }; 3897 // template <class T> struct C : A {}; 3898 // template <class T> struct D : C<T> { using B::foo; } // <--- 3899 // This is invalid (during instantiation) in C++03 because B::foo 3900 // resolves to the using decl in B, which is not a base class of D<T>. 3901 // We can't diagnose it immediately because C<T> is an unknown 3902 // specialization. The UsingShadowDecl in D<T> then points directly 3903 // to A::foo, which will look well-formed when we instantiate. 3904 // The right solution is to not collapse the shadow-decl chain. 3905 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3906 DeclContext *OrigDC = Orig->getDeclContext(); 3907 3908 // Handle enums and anonymous structs. 3909 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3910 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3911 while (OrigRec->isAnonymousStructOrUnion()) 3912 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3913 3914 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3915 if (OrigDC == CurContext) { 3916 Diag(Using->getLocation(), 3917 diag::err_using_decl_nested_name_specifier_is_current_class) 3918 << Using->getNestedNameRange(); 3919 Diag(Orig->getLocation(), diag::note_using_decl_target); 3920 return true; 3921 } 3922 3923 Diag(Using->getNestedNameRange().getBegin(), 3924 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3925 << Using->getTargetNestedNameDecl() 3926 << cast<CXXRecordDecl>(CurContext) 3927 << Using->getNestedNameRange(); 3928 Diag(Orig->getLocation(), diag::note_using_decl_target); 3929 return true; 3930 } 3931 } 3932 3933 if (Previous.empty()) return false; 3934 3935 NamedDecl *Target = Orig; 3936 if (isa<UsingShadowDecl>(Target)) 3937 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3938 3939 // If the target happens to be one of the previous declarations, we 3940 // don't have a conflict. 3941 // 3942 // FIXME: but we might be increasing its access, in which case we 3943 // should redeclare it. 3944 NamedDecl *NonTag = 0, *Tag = 0; 3945 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3946 I != E; ++I) { 3947 NamedDecl *D = (*I)->getUnderlyingDecl(); 3948 bool Result; 3949 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3950 return Result; 3951 3952 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3953 } 3954 3955 if (Target->isFunctionOrFunctionTemplate()) { 3956 FunctionDecl *FD; 3957 if (isa<FunctionTemplateDecl>(Target)) 3958 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3959 else 3960 FD = cast<FunctionDecl>(Target); 3961 3962 NamedDecl *OldDecl = 0; 3963 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3964 case Ovl_Overload: 3965 return false; 3966 3967 case Ovl_NonFunction: 3968 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3969 break; 3970 3971 // We found a decl with the exact signature. 3972 case Ovl_Match: 3973 // If we're in a record, we want to hide the target, so we 3974 // return true (without a diagnostic) to tell the caller not to 3975 // build a shadow decl. 3976 if (CurContext->isRecord()) 3977 return true; 3978 3979 // If we're not in a record, this is an error. 3980 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3981 break; 3982 } 3983 3984 Diag(Target->getLocation(), diag::note_using_decl_target); 3985 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3986 return true; 3987 } 3988 3989 // Target is not a function. 3990 3991 if (isa<TagDecl>(Target)) { 3992 // No conflict between a tag and a non-tag. 3993 if (!Tag) return false; 3994 3995 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3996 Diag(Target->getLocation(), diag::note_using_decl_target); 3997 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3998 return true; 3999 } 4000 4001 // No conflict between a tag and a non-tag. 4002 if (!NonTag) return false; 4003 4004 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4005 Diag(Target->getLocation(), diag::note_using_decl_target); 4006 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4007 return true; 4008} 4009 4010/// Builds a shadow declaration corresponding to a 'using' declaration. 4011UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4012 UsingDecl *UD, 4013 NamedDecl *Orig) { 4014 4015 // If we resolved to another shadow declaration, just coalesce them. 4016 NamedDecl *Target = Orig; 4017 if (isa<UsingShadowDecl>(Target)) { 4018 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4019 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4020 } 4021 4022 UsingShadowDecl *Shadow 4023 = UsingShadowDecl::Create(Context, CurContext, 4024 UD->getLocation(), UD, Target); 4025 UD->addShadowDecl(Shadow); 4026 4027 Shadow->setAccess(UD->getAccess()); 4028 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4029 Shadow->setInvalidDecl(); 4030 4031 if (S) 4032 PushOnScopeChains(Shadow, S); 4033 else 4034 CurContext->addDecl(Shadow); 4035 4036 4037 return Shadow; 4038} 4039 4040/// Hides a using shadow declaration. This is required by the current 4041/// using-decl implementation when a resolvable using declaration in a 4042/// class is followed by a declaration which would hide or override 4043/// one or more of the using decl's targets; for example: 4044/// 4045/// struct Base { void foo(int); }; 4046/// struct Derived : Base { 4047/// using Base::foo; 4048/// void foo(int); 4049/// }; 4050/// 4051/// The governing language is C++03 [namespace.udecl]p12: 4052/// 4053/// When a using-declaration brings names from a base class into a 4054/// derived class scope, member functions in the derived class 4055/// override and/or hide member functions with the same name and 4056/// parameter types in a base class (rather than conflicting). 4057/// 4058/// There are two ways to implement this: 4059/// (1) optimistically create shadow decls when they're not hidden 4060/// by existing declarations, or 4061/// (2) don't create any shadow decls (or at least don't make them 4062/// visible) until we've fully parsed/instantiated the class. 4063/// The problem with (1) is that we might have to retroactively remove 4064/// a shadow decl, which requires several O(n) operations because the 4065/// decl structures are (very reasonably) not designed for removal. 4066/// (2) avoids this but is very fiddly and phase-dependent. 4067void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4068 if (Shadow->getDeclName().getNameKind() == 4069 DeclarationName::CXXConversionFunctionName) 4070 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4071 4072 // Remove it from the DeclContext... 4073 Shadow->getDeclContext()->removeDecl(Shadow); 4074 4075 // ...and the scope, if applicable... 4076 if (S) { 4077 S->RemoveDecl(Shadow); 4078 IdResolver.RemoveDecl(Shadow); 4079 } 4080 4081 // ...and the using decl. 4082 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4083 4084 // TODO: complain somehow if Shadow was used. It shouldn't 4085 // be possible for this to happen, because...? 4086} 4087 4088/// Builds a using declaration. 4089/// 4090/// \param IsInstantiation - Whether this call arises from an 4091/// instantiation of an unresolved using declaration. We treat 4092/// the lookup differently for these declarations. 4093NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4094 SourceLocation UsingLoc, 4095 CXXScopeSpec &SS, 4096 const DeclarationNameInfo &NameInfo, 4097 AttributeList *AttrList, 4098 bool IsInstantiation, 4099 bool IsTypeName, 4100 SourceLocation TypenameLoc) { 4101 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4102 SourceLocation IdentLoc = NameInfo.getLoc(); 4103 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4104 4105 // FIXME: We ignore attributes for now. 4106 4107 if (SS.isEmpty()) { 4108 Diag(IdentLoc, diag::err_using_requires_qualname); 4109 return 0; 4110 } 4111 4112 // Do the redeclaration lookup in the current scope. 4113 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4114 ForRedeclaration); 4115 Previous.setHideTags(false); 4116 if (S) { 4117 LookupName(Previous, S); 4118 4119 // It is really dumb that we have to do this. 4120 LookupResult::Filter F = Previous.makeFilter(); 4121 while (F.hasNext()) { 4122 NamedDecl *D = F.next(); 4123 if (!isDeclInScope(D, CurContext, S)) 4124 F.erase(); 4125 } 4126 F.done(); 4127 } else { 4128 assert(IsInstantiation && "no scope in non-instantiation"); 4129 assert(CurContext->isRecord() && "scope not record in instantiation"); 4130 LookupQualifiedName(Previous, CurContext); 4131 } 4132 4133 NestedNameSpecifier *NNS = SS.getScopeRep(); 4134 4135 // Check for invalid redeclarations. 4136 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4137 return 0; 4138 4139 // Check for bad qualifiers. 4140 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4141 return 0; 4142 4143 DeclContext *LookupContext = computeDeclContext(SS); 4144 NamedDecl *D; 4145 if (!LookupContext) { 4146 if (IsTypeName) { 4147 // FIXME: not all declaration name kinds are legal here 4148 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4149 UsingLoc, TypenameLoc, 4150 SS.getRange(), NNS, 4151 IdentLoc, NameInfo.getName()); 4152 } else { 4153 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 4154 UsingLoc, SS.getRange(), 4155 NNS, NameInfo); 4156 } 4157 } else { 4158 D = UsingDecl::Create(Context, CurContext, 4159 SS.getRange(), UsingLoc, NNS, NameInfo, 4160 IsTypeName); 4161 } 4162 D->setAccess(AS); 4163 CurContext->addDecl(D); 4164 4165 if (!LookupContext) return D; 4166 UsingDecl *UD = cast<UsingDecl>(D); 4167 4168 if (RequireCompleteDeclContext(SS, LookupContext)) { 4169 UD->setInvalidDecl(); 4170 return UD; 4171 } 4172 4173 // Constructor inheriting using decls get special treatment. 4174 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4175 if (CheckInheritedConstructorUsingDecl(UD)) 4176 UD->setInvalidDecl(); 4177 return UD; 4178 } 4179 4180 // Otherwise, look up the target name. 4181 4182 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4183 4184 // Unlike most lookups, we don't always want to hide tag 4185 // declarations: tag names are visible through the using declaration 4186 // even if hidden by ordinary names, *except* in a dependent context 4187 // where it's important for the sanity of two-phase lookup. 4188 if (!IsInstantiation) 4189 R.setHideTags(false); 4190 4191 LookupQualifiedName(R, LookupContext); 4192 4193 if (R.empty()) { 4194 Diag(IdentLoc, diag::err_no_member) 4195 << NameInfo.getName() << LookupContext << SS.getRange(); 4196 UD->setInvalidDecl(); 4197 return UD; 4198 } 4199 4200 if (R.isAmbiguous()) { 4201 UD->setInvalidDecl(); 4202 return UD; 4203 } 4204 4205 if (IsTypeName) { 4206 // If we asked for a typename and got a non-type decl, error out. 4207 if (!R.getAsSingle<TypeDecl>()) { 4208 Diag(IdentLoc, diag::err_using_typename_non_type); 4209 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4210 Diag((*I)->getUnderlyingDecl()->getLocation(), 4211 diag::note_using_decl_target); 4212 UD->setInvalidDecl(); 4213 return UD; 4214 } 4215 } else { 4216 // If we asked for a non-typename and we got a type, error out, 4217 // but only if this is an instantiation of an unresolved using 4218 // decl. Otherwise just silently find the type name. 4219 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4220 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4221 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4222 UD->setInvalidDecl(); 4223 return UD; 4224 } 4225 } 4226 4227 // C++0x N2914 [namespace.udecl]p6: 4228 // A using-declaration shall not name a namespace. 4229 if (R.getAsSingle<NamespaceDecl>()) { 4230 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4231 << SS.getRange(); 4232 UD->setInvalidDecl(); 4233 return UD; 4234 } 4235 4236 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4237 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4238 BuildUsingShadowDecl(S, UD, *I); 4239 } 4240 4241 return UD; 4242} 4243 4244/// Additional checks for a using declaration referring to a constructor name. 4245bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4246 if (UD->isTypeName()) { 4247 // FIXME: Cannot specify typename when specifying constructor 4248 return true; 4249 } 4250 4251 const Type *SourceType = UD->getTargetNestedNameDecl()->getAsType(); 4252 assert(SourceType && 4253 "Using decl naming constructor doesn't have type in scope spec."); 4254 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4255 4256 // Check whether the named type is a direct base class. 4257 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4258 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4259 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4260 BaseIt != BaseE; ++BaseIt) { 4261 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4262 if (CanonicalSourceType == BaseType) 4263 break; 4264 } 4265 4266 if (BaseIt == BaseE) { 4267 // Did not find SourceType in the bases. 4268 Diag(UD->getUsingLocation(), 4269 diag::err_using_decl_constructor_not_in_direct_base) 4270 << UD->getNameInfo().getSourceRange() 4271 << QualType(SourceType, 0) << TargetClass; 4272 return true; 4273 } 4274 4275 BaseIt->setInheritConstructors(); 4276 4277 return false; 4278} 4279 4280/// Checks that the given using declaration is not an invalid 4281/// redeclaration. Note that this is checking only for the using decl 4282/// itself, not for any ill-formedness among the UsingShadowDecls. 4283bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4284 bool isTypeName, 4285 const CXXScopeSpec &SS, 4286 SourceLocation NameLoc, 4287 const LookupResult &Prev) { 4288 // C++03 [namespace.udecl]p8: 4289 // C++0x [namespace.udecl]p10: 4290 // A using-declaration is a declaration and can therefore be used 4291 // repeatedly where (and only where) multiple declarations are 4292 // allowed. 4293 // 4294 // That's in non-member contexts. 4295 if (!CurContext->getRedeclContext()->isRecord()) 4296 return false; 4297 4298 NestedNameSpecifier *Qual 4299 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4300 4301 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4302 NamedDecl *D = *I; 4303 4304 bool DTypename; 4305 NestedNameSpecifier *DQual; 4306 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4307 DTypename = UD->isTypeName(); 4308 DQual = UD->getTargetNestedNameDecl(); 4309 } else if (UnresolvedUsingValueDecl *UD 4310 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4311 DTypename = false; 4312 DQual = UD->getTargetNestedNameSpecifier(); 4313 } else if (UnresolvedUsingTypenameDecl *UD 4314 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4315 DTypename = true; 4316 DQual = UD->getTargetNestedNameSpecifier(); 4317 } else continue; 4318 4319 // using decls differ if one says 'typename' and the other doesn't. 4320 // FIXME: non-dependent using decls? 4321 if (isTypeName != DTypename) continue; 4322 4323 // using decls differ if they name different scopes (but note that 4324 // template instantiation can cause this check to trigger when it 4325 // didn't before instantiation). 4326 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4327 Context.getCanonicalNestedNameSpecifier(DQual)) 4328 continue; 4329 4330 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4331 Diag(D->getLocation(), diag::note_using_decl) << 1; 4332 return true; 4333 } 4334 4335 return false; 4336} 4337 4338 4339/// Checks that the given nested-name qualifier used in a using decl 4340/// in the current context is appropriately related to the current 4341/// scope. If an error is found, diagnoses it and returns true. 4342bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4343 const CXXScopeSpec &SS, 4344 SourceLocation NameLoc) { 4345 DeclContext *NamedContext = computeDeclContext(SS); 4346 4347 if (!CurContext->isRecord()) { 4348 // C++03 [namespace.udecl]p3: 4349 // C++0x [namespace.udecl]p8: 4350 // A using-declaration for a class member shall be a member-declaration. 4351 4352 // If we weren't able to compute a valid scope, it must be a 4353 // dependent class scope. 4354 if (!NamedContext || NamedContext->isRecord()) { 4355 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4356 << SS.getRange(); 4357 return true; 4358 } 4359 4360 // Otherwise, everything is known to be fine. 4361 return false; 4362 } 4363 4364 // The current scope is a record. 4365 4366 // If the named context is dependent, we can't decide much. 4367 if (!NamedContext) { 4368 // FIXME: in C++0x, we can diagnose if we can prove that the 4369 // nested-name-specifier does not refer to a base class, which is 4370 // still possible in some cases. 4371 4372 // Otherwise we have to conservatively report that things might be 4373 // okay. 4374 return false; 4375 } 4376 4377 if (!NamedContext->isRecord()) { 4378 // Ideally this would point at the last name in the specifier, 4379 // but we don't have that level of source info. 4380 Diag(SS.getRange().getBegin(), 4381 diag::err_using_decl_nested_name_specifier_is_not_class) 4382 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4383 return true; 4384 } 4385 4386 if (!NamedContext->isDependentContext() && 4387 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4388 return true; 4389 4390 if (getLangOptions().CPlusPlus0x) { 4391 // C++0x [namespace.udecl]p3: 4392 // In a using-declaration used as a member-declaration, the 4393 // nested-name-specifier shall name a base class of the class 4394 // being defined. 4395 4396 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4397 cast<CXXRecordDecl>(NamedContext))) { 4398 if (CurContext == NamedContext) { 4399 Diag(NameLoc, 4400 diag::err_using_decl_nested_name_specifier_is_current_class) 4401 << SS.getRange(); 4402 return true; 4403 } 4404 4405 Diag(SS.getRange().getBegin(), 4406 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4407 << (NestedNameSpecifier*) SS.getScopeRep() 4408 << cast<CXXRecordDecl>(CurContext) 4409 << SS.getRange(); 4410 return true; 4411 } 4412 4413 return false; 4414 } 4415 4416 // C++03 [namespace.udecl]p4: 4417 // A using-declaration used as a member-declaration shall refer 4418 // to a member of a base class of the class being defined [etc.]. 4419 4420 // Salient point: SS doesn't have to name a base class as long as 4421 // lookup only finds members from base classes. Therefore we can 4422 // diagnose here only if we can prove that that can't happen, 4423 // i.e. if the class hierarchies provably don't intersect. 4424 4425 // TODO: it would be nice if "definitely valid" results were cached 4426 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4427 // need to be repeated. 4428 4429 struct UserData { 4430 llvm::DenseSet<const CXXRecordDecl*> Bases; 4431 4432 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4433 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4434 Data->Bases.insert(Base); 4435 return true; 4436 } 4437 4438 bool hasDependentBases(const CXXRecordDecl *Class) { 4439 return !Class->forallBases(collect, this); 4440 } 4441 4442 /// Returns true if the base is dependent or is one of the 4443 /// accumulated base classes. 4444 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4445 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4446 return !Data->Bases.count(Base); 4447 } 4448 4449 bool mightShareBases(const CXXRecordDecl *Class) { 4450 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4451 } 4452 }; 4453 4454 UserData Data; 4455 4456 // Returns false if we find a dependent base. 4457 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4458 return false; 4459 4460 // Returns false if the class has a dependent base or if it or one 4461 // of its bases is present in the base set of the current context. 4462 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4463 return false; 4464 4465 Diag(SS.getRange().getBegin(), 4466 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4467 << (NestedNameSpecifier*) SS.getScopeRep() 4468 << cast<CXXRecordDecl>(CurContext) 4469 << SS.getRange(); 4470 4471 return true; 4472} 4473 4474Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4475 SourceLocation NamespaceLoc, 4476 SourceLocation AliasLoc, 4477 IdentifierInfo *Alias, 4478 CXXScopeSpec &SS, 4479 SourceLocation IdentLoc, 4480 IdentifierInfo *Ident) { 4481 4482 // Lookup the namespace name. 4483 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4484 LookupParsedName(R, S, &SS); 4485 4486 // Check if we have a previous declaration with the same name. 4487 NamedDecl *PrevDecl 4488 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4489 ForRedeclaration); 4490 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4491 PrevDecl = 0; 4492 4493 if (PrevDecl) { 4494 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4495 // We already have an alias with the same name that points to the same 4496 // namespace, so don't create a new one. 4497 // FIXME: At some point, we'll want to create the (redundant) 4498 // declaration to maintain better source information. 4499 if (!R.isAmbiguous() && !R.empty() && 4500 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4501 return 0; 4502 } 4503 4504 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4505 diag::err_redefinition_different_kind; 4506 Diag(AliasLoc, DiagID) << Alias; 4507 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4508 return 0; 4509 } 4510 4511 if (R.isAmbiguous()) 4512 return 0; 4513 4514 if (R.empty()) { 4515 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4516 CTC_NoKeywords, 0)) { 4517 if (R.getAsSingle<NamespaceDecl>() || 4518 R.getAsSingle<NamespaceAliasDecl>()) { 4519 if (DeclContext *DC = computeDeclContext(SS, false)) 4520 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4521 << Ident << DC << Corrected << SS.getRange() 4522 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4523 else 4524 Diag(IdentLoc, diag::err_using_directive_suggest) 4525 << Ident << Corrected 4526 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4527 4528 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4529 << Corrected; 4530 4531 Ident = Corrected.getAsIdentifierInfo(); 4532 } else { 4533 R.clear(); 4534 R.setLookupName(Ident); 4535 } 4536 } 4537 4538 if (R.empty()) { 4539 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4540 return 0; 4541 } 4542 } 4543 4544 NamespaceAliasDecl *AliasDecl = 4545 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4546 Alias, SS.getRange(), 4547 (NestedNameSpecifier *)SS.getScopeRep(), 4548 IdentLoc, R.getFoundDecl()); 4549 4550 PushOnScopeChains(AliasDecl, S); 4551 return AliasDecl; 4552} 4553 4554namespace { 4555 /// \brief Scoped object used to handle the state changes required in Sema 4556 /// to implicitly define the body of a C++ member function; 4557 class ImplicitlyDefinedFunctionScope { 4558 Sema &S; 4559 Sema::ContextRAII SavedContext; 4560 4561 public: 4562 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4563 : S(S), SavedContext(S, Method) 4564 { 4565 S.PushFunctionScope(); 4566 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4567 } 4568 4569 ~ImplicitlyDefinedFunctionScope() { 4570 S.PopExpressionEvaluationContext(); 4571 S.PopFunctionOrBlockScope(); 4572 } 4573 }; 4574} 4575 4576static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4577 CXXRecordDecl *D) { 4578 ASTContext &Context = Self.Context; 4579 QualType ClassType = Context.getTypeDeclType(D); 4580 DeclarationName ConstructorName 4581 = Context.DeclarationNames.getCXXConstructorName( 4582 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4583 4584 DeclContext::lookup_const_iterator Con, ConEnd; 4585 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4586 Con != ConEnd; ++Con) { 4587 // FIXME: In C++0x, a constructor template can be a default constructor. 4588 if (isa<FunctionTemplateDecl>(*Con)) 4589 continue; 4590 4591 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4592 if (Constructor->isDefaultConstructor()) 4593 return Constructor; 4594 } 4595 return 0; 4596} 4597 4598CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4599 CXXRecordDecl *ClassDecl) { 4600 // C++ [class.ctor]p5: 4601 // A default constructor for a class X is a constructor of class X 4602 // that can be called without an argument. If there is no 4603 // user-declared constructor for class X, a default constructor is 4604 // implicitly declared. An implicitly-declared default constructor 4605 // is an inline public member of its class. 4606 assert(!ClassDecl->hasUserDeclaredConstructor() && 4607 "Should not build implicit default constructor!"); 4608 4609 // C++ [except.spec]p14: 4610 // An implicitly declared special member function (Clause 12) shall have an 4611 // exception-specification. [...] 4612 ImplicitExceptionSpecification ExceptSpec(Context); 4613 4614 // Direct base-class destructors. 4615 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4616 BEnd = ClassDecl->bases_end(); 4617 B != BEnd; ++B) { 4618 if (B->isVirtual()) // Handled below. 4619 continue; 4620 4621 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4622 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4623 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4624 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4625 else if (CXXConstructorDecl *Constructor 4626 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4627 ExceptSpec.CalledDecl(Constructor); 4628 } 4629 } 4630 4631 // Virtual base-class destructors. 4632 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4633 BEnd = ClassDecl->vbases_end(); 4634 B != BEnd; ++B) { 4635 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4636 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4637 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4638 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4639 else if (CXXConstructorDecl *Constructor 4640 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4641 ExceptSpec.CalledDecl(Constructor); 4642 } 4643 } 4644 4645 // Field destructors. 4646 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4647 FEnd = ClassDecl->field_end(); 4648 F != FEnd; ++F) { 4649 if (const RecordType *RecordTy 4650 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4651 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4652 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4653 ExceptSpec.CalledDecl( 4654 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4655 else if (CXXConstructorDecl *Constructor 4656 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4657 ExceptSpec.CalledDecl(Constructor); 4658 } 4659 } 4660 4661 FunctionProtoType::ExtProtoInfo EPI; 4662 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4663 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4664 EPI.NumExceptions = ExceptSpec.size(); 4665 EPI.Exceptions = ExceptSpec.data(); 4666 4667 // Create the actual constructor declaration. 4668 CanQualType ClassType 4669 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4670 DeclarationName Name 4671 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4672 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4673 CXXConstructorDecl *DefaultCon 4674 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4675 Context.getFunctionType(Context.VoidTy, 4676 0, 0, EPI), 4677 /*TInfo=*/0, 4678 /*isExplicit=*/false, 4679 /*isInline=*/true, 4680 /*isImplicitlyDeclared=*/true); 4681 DefaultCon->setAccess(AS_public); 4682 DefaultCon->setImplicit(); 4683 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4684 4685 // Note that we have declared this constructor. 4686 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4687 4688 if (Scope *S = getScopeForContext(ClassDecl)) 4689 PushOnScopeChains(DefaultCon, S, false); 4690 ClassDecl->addDecl(DefaultCon); 4691 4692 return DefaultCon; 4693} 4694 4695void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4696 CXXConstructorDecl *Constructor) { 4697 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4698 !Constructor->isUsed(false)) && 4699 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4700 4701 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4702 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4703 4704 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4705 DiagnosticErrorTrap Trap(Diags); 4706 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4707 Trap.hasErrorOccurred()) { 4708 Diag(CurrentLocation, diag::note_member_synthesized_at) 4709 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4710 Constructor->setInvalidDecl(); 4711 return; 4712 } 4713 4714 SourceLocation Loc = Constructor->getLocation(); 4715 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4716 4717 Constructor->setUsed(); 4718 MarkVTableUsed(CurrentLocation, ClassDecl); 4719} 4720 4721void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4722 // We start with an initial pass over the base classes to collect those that 4723 // inherit constructors from. If there are none, we can forgo all further 4724 // processing. 4725 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4726 BasesVector BasesToInheritFrom; 4727 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4728 BaseE = ClassDecl->bases_end(); 4729 BaseIt != BaseE; ++BaseIt) { 4730 if (BaseIt->getInheritConstructors()) { 4731 QualType Base = BaseIt->getType(); 4732 if (Base->isDependentType()) { 4733 // If we inherit constructors from anything that is dependent, just 4734 // abort processing altogether. We'll get another chance for the 4735 // instantiations. 4736 return; 4737 } 4738 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4739 } 4740 } 4741 if (BasesToInheritFrom.empty()) 4742 return; 4743 4744 // Now collect the constructors that we already have in the current class. 4745 // Those take precedence over inherited constructors. 4746 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4747 // unless there is a user-declared constructor with the same signature in 4748 // the class where the using-declaration appears. 4749 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4750 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4751 CtorE = ClassDecl->ctor_end(); 4752 CtorIt != CtorE; ++CtorIt) { 4753 ExistingConstructors.insert( 4754 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4755 } 4756 4757 Scope *S = getScopeForContext(ClassDecl); 4758 DeclarationName CreatedCtorName = 4759 Context.DeclarationNames.getCXXConstructorName( 4760 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4761 4762 // Now comes the true work. 4763 // First, we keep a map from constructor types to the base that introduced 4764 // them. Needed for finding conflicting constructors. We also keep the 4765 // actually inserted declarations in there, for pretty diagnostics. 4766 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4767 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4768 ConstructorToSourceMap InheritedConstructors; 4769 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4770 BaseE = BasesToInheritFrom.end(); 4771 BaseIt != BaseE; ++BaseIt) { 4772 const RecordType *Base = *BaseIt; 4773 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4774 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4775 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4776 CtorE = BaseDecl->ctor_end(); 4777 CtorIt != CtorE; ++CtorIt) { 4778 // Find the using declaration for inheriting this base's constructors. 4779 DeclarationName Name = 4780 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4781 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4782 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4783 SourceLocation UsingLoc = UD ? UD->getLocation() : 4784 ClassDecl->getLocation(); 4785 4786 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4787 // from the class X named in the using-declaration consists of actual 4788 // constructors and notional constructors that result from the 4789 // transformation of defaulted parameters as follows: 4790 // - all non-template default constructors of X, and 4791 // - for each non-template constructor of X that has at least one 4792 // parameter with a default argument, the set of constructors that 4793 // results from omitting any ellipsis parameter specification and 4794 // successively omitting parameters with a default argument from the 4795 // end of the parameter-type-list. 4796 CXXConstructorDecl *BaseCtor = *CtorIt; 4797 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4798 const FunctionProtoType *BaseCtorType = 4799 BaseCtor->getType()->getAs<FunctionProtoType>(); 4800 4801 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4802 maxParams = BaseCtor->getNumParams(); 4803 params <= maxParams; ++params) { 4804 // Skip default constructors. They're never inherited. 4805 if (params == 0) 4806 continue; 4807 // Skip copy and move constructors for the same reason. 4808 if (CanBeCopyOrMove && params == 1) 4809 continue; 4810 4811 // Build up a function type for this particular constructor. 4812 // FIXME: The working paper does not consider that the exception spec 4813 // for the inheriting constructor might be larger than that of the 4814 // source. This code doesn't yet, either. 4815 const Type *NewCtorType; 4816 if (params == maxParams) 4817 NewCtorType = BaseCtorType; 4818 else { 4819 llvm::SmallVector<QualType, 16> Args; 4820 for (unsigned i = 0; i < params; ++i) { 4821 Args.push_back(BaseCtorType->getArgType(i)); 4822 } 4823 FunctionProtoType::ExtProtoInfo ExtInfo = 4824 BaseCtorType->getExtProtoInfo(); 4825 ExtInfo.Variadic = false; 4826 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4827 Args.data(), params, ExtInfo) 4828 .getTypePtr(); 4829 } 4830 const Type *CanonicalNewCtorType = 4831 Context.getCanonicalType(NewCtorType); 4832 4833 // Now that we have the type, first check if the class already has a 4834 // constructor with this signature. 4835 if (ExistingConstructors.count(CanonicalNewCtorType)) 4836 continue; 4837 4838 // Then we check if we have already declared an inherited constructor 4839 // with this signature. 4840 std::pair<ConstructorToSourceMap::iterator, bool> result = 4841 InheritedConstructors.insert(std::make_pair( 4842 CanonicalNewCtorType, 4843 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4844 if (!result.second) { 4845 // Already in the map. If it came from a different class, that's an 4846 // error. Not if it's from the same. 4847 CanQualType PreviousBase = result.first->second.first; 4848 if (CanonicalBase != PreviousBase) { 4849 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4850 const CXXConstructorDecl *PrevBaseCtor = 4851 PrevCtor->getInheritedConstructor(); 4852 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4853 4854 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4855 Diag(BaseCtor->getLocation(), 4856 diag::note_using_decl_constructor_conflict_current_ctor); 4857 Diag(PrevBaseCtor->getLocation(), 4858 diag::note_using_decl_constructor_conflict_previous_ctor); 4859 Diag(PrevCtor->getLocation(), 4860 diag::note_using_decl_constructor_conflict_previous_using); 4861 } 4862 continue; 4863 } 4864 4865 // OK, we're there, now add the constructor. 4866 // C++0x [class.inhctor]p8: [...] that would be performed by a 4867 // user-writtern inline constructor [...] 4868 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4869 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4870 Context, ClassDecl, DNI, QualType(NewCtorType, 0), /*TInfo=*/0, 4871 BaseCtor->isExplicit(), /*Inline=*/true, 4872 /*ImplicitlyDeclared=*/true); 4873 NewCtor->setAccess(BaseCtor->getAccess()); 4874 4875 // Build up the parameter decls and add them. 4876 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4877 for (unsigned i = 0; i < params; ++i) { 4878 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, UsingLoc, 4879 /*IdentifierInfo=*/0, 4880 BaseCtorType->getArgType(i), 4881 /*TInfo=*/0, SC_None, 4882 SC_None, /*DefaultArg=*/0)); 4883 } 4884 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4885 NewCtor->setInheritedConstructor(BaseCtor); 4886 4887 PushOnScopeChains(NewCtor, S, false); 4888 ClassDecl->addDecl(NewCtor); 4889 result.first->second.second = NewCtor; 4890 } 4891 } 4892 } 4893} 4894 4895CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4896 // C++ [class.dtor]p2: 4897 // If a class has no user-declared destructor, a destructor is 4898 // declared implicitly. An implicitly-declared destructor is an 4899 // inline public member of its class. 4900 4901 // C++ [except.spec]p14: 4902 // An implicitly declared special member function (Clause 12) shall have 4903 // an exception-specification. 4904 ImplicitExceptionSpecification ExceptSpec(Context); 4905 4906 // Direct base-class destructors. 4907 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4908 BEnd = ClassDecl->bases_end(); 4909 B != BEnd; ++B) { 4910 if (B->isVirtual()) // Handled below. 4911 continue; 4912 4913 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4914 ExceptSpec.CalledDecl( 4915 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4916 } 4917 4918 // Virtual base-class destructors. 4919 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4920 BEnd = ClassDecl->vbases_end(); 4921 B != BEnd; ++B) { 4922 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4923 ExceptSpec.CalledDecl( 4924 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4925 } 4926 4927 // Field destructors. 4928 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4929 FEnd = ClassDecl->field_end(); 4930 F != FEnd; ++F) { 4931 if (const RecordType *RecordTy 4932 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4933 ExceptSpec.CalledDecl( 4934 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4935 } 4936 4937 // Create the actual destructor declaration. 4938 FunctionProtoType::ExtProtoInfo EPI; 4939 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4940 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4941 EPI.NumExceptions = ExceptSpec.size(); 4942 EPI.Exceptions = ExceptSpec.data(); 4943 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4944 4945 CanQualType ClassType 4946 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4947 DeclarationName Name 4948 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4949 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4950 CXXDestructorDecl *Destructor 4951 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4952 /*isInline=*/true, 4953 /*isImplicitlyDeclared=*/true); 4954 Destructor->setAccess(AS_public); 4955 Destructor->setImplicit(); 4956 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4957 4958 // Note that we have declared this destructor. 4959 ++ASTContext::NumImplicitDestructorsDeclared; 4960 4961 // Introduce this destructor into its scope. 4962 if (Scope *S = getScopeForContext(ClassDecl)) 4963 PushOnScopeChains(Destructor, S, false); 4964 ClassDecl->addDecl(Destructor); 4965 4966 // This could be uniqued if it ever proves significant. 4967 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4968 4969 AddOverriddenMethods(ClassDecl, Destructor); 4970 4971 return Destructor; 4972} 4973 4974void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4975 CXXDestructorDecl *Destructor) { 4976 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4977 "DefineImplicitDestructor - call it for implicit default dtor"); 4978 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4979 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4980 4981 if (Destructor->isInvalidDecl()) 4982 return; 4983 4984 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4985 4986 DiagnosticErrorTrap Trap(Diags); 4987 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4988 Destructor->getParent()); 4989 4990 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4991 Diag(CurrentLocation, diag::note_member_synthesized_at) 4992 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4993 4994 Destructor->setInvalidDecl(); 4995 return; 4996 } 4997 4998 SourceLocation Loc = Destructor->getLocation(); 4999 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5000 5001 Destructor->setUsed(); 5002 MarkVTableUsed(CurrentLocation, ClassDecl); 5003} 5004 5005/// \brief Builds a statement that copies the given entity from \p From to 5006/// \c To. 5007/// 5008/// This routine is used to copy the members of a class with an 5009/// implicitly-declared copy assignment operator. When the entities being 5010/// copied are arrays, this routine builds for loops to copy them. 5011/// 5012/// \param S The Sema object used for type-checking. 5013/// 5014/// \param Loc The location where the implicit copy is being generated. 5015/// 5016/// \param T The type of the expressions being copied. Both expressions must 5017/// have this type. 5018/// 5019/// \param To The expression we are copying to. 5020/// 5021/// \param From The expression we are copying from. 5022/// 5023/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5024/// Otherwise, it's a non-static member subobject. 5025/// 5026/// \param Depth Internal parameter recording the depth of the recursion. 5027/// 5028/// \returns A statement or a loop that copies the expressions. 5029static StmtResult 5030BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5031 Expr *To, Expr *From, 5032 bool CopyingBaseSubobject, unsigned Depth = 0) { 5033 // C++0x [class.copy]p30: 5034 // Each subobject is assigned in the manner appropriate to its type: 5035 // 5036 // - if the subobject is of class type, the copy assignment operator 5037 // for the class is used (as if by explicit qualification; that is, 5038 // ignoring any possible virtual overriding functions in more derived 5039 // classes); 5040 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5041 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5042 5043 // Look for operator=. 5044 DeclarationName Name 5045 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5046 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5047 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5048 5049 // Filter out any result that isn't a copy-assignment operator. 5050 LookupResult::Filter F = OpLookup.makeFilter(); 5051 while (F.hasNext()) { 5052 NamedDecl *D = F.next(); 5053 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5054 if (Method->isCopyAssignmentOperator()) 5055 continue; 5056 5057 F.erase(); 5058 } 5059 F.done(); 5060 5061 // Suppress the protected check (C++ [class.protected]) for each of the 5062 // assignment operators we found. This strange dance is required when 5063 // we're assigning via a base classes's copy-assignment operator. To 5064 // ensure that we're getting the right base class subobject (without 5065 // ambiguities), we need to cast "this" to that subobject type; to 5066 // ensure that we don't go through the virtual call mechanism, we need 5067 // to qualify the operator= name with the base class (see below). However, 5068 // this means that if the base class has a protected copy assignment 5069 // operator, the protected member access check will fail. So, we 5070 // rewrite "protected" access to "public" access in this case, since we 5071 // know by construction that we're calling from a derived class. 5072 if (CopyingBaseSubobject) { 5073 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5074 L != LEnd; ++L) { 5075 if (L.getAccess() == AS_protected) 5076 L.setAccess(AS_public); 5077 } 5078 } 5079 5080 // Create the nested-name-specifier that will be used to qualify the 5081 // reference to operator=; this is required to suppress the virtual 5082 // call mechanism. 5083 CXXScopeSpec SS; 5084 SS.setRange(Loc); 5085 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 5086 T.getTypePtr())); 5087 5088 // Create the reference to operator=. 5089 ExprResult OpEqualRef 5090 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5091 /*FirstQualifierInScope=*/0, OpLookup, 5092 /*TemplateArgs=*/0, 5093 /*SuppressQualifierCheck=*/true); 5094 if (OpEqualRef.isInvalid()) 5095 return StmtError(); 5096 5097 // Build the call to the assignment operator. 5098 5099 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5100 OpEqualRef.takeAs<Expr>(), 5101 Loc, &From, 1, Loc); 5102 if (Call.isInvalid()) 5103 return StmtError(); 5104 5105 return S.Owned(Call.takeAs<Stmt>()); 5106 } 5107 5108 // - if the subobject is of scalar type, the built-in assignment 5109 // operator is used. 5110 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5111 if (!ArrayTy) { 5112 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5113 if (Assignment.isInvalid()) 5114 return StmtError(); 5115 5116 return S.Owned(Assignment.takeAs<Stmt>()); 5117 } 5118 5119 // - if the subobject is an array, each element is assigned, in the 5120 // manner appropriate to the element type; 5121 5122 // Construct a loop over the array bounds, e.g., 5123 // 5124 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5125 // 5126 // that will copy each of the array elements. 5127 QualType SizeType = S.Context.getSizeType(); 5128 5129 // Create the iteration variable. 5130 IdentifierInfo *IterationVarName = 0; 5131 { 5132 llvm::SmallString<8> Str; 5133 llvm::raw_svector_ostream OS(Str); 5134 OS << "__i" << Depth; 5135 IterationVarName = &S.Context.Idents.get(OS.str()); 5136 } 5137 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 5138 IterationVarName, SizeType, 5139 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5140 SC_None, SC_None); 5141 5142 // Initialize the iteration variable to zero. 5143 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5144 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5145 5146 // Create a reference to the iteration variable; we'll use this several 5147 // times throughout. 5148 Expr *IterationVarRef 5149 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5150 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5151 5152 // Create the DeclStmt that holds the iteration variable. 5153 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5154 5155 // Create the comparison against the array bound. 5156 llvm::APInt Upper 5157 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5158 Expr *Comparison 5159 = new (S.Context) BinaryOperator(IterationVarRef, 5160 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5161 BO_NE, S.Context.BoolTy, 5162 VK_RValue, OK_Ordinary, Loc); 5163 5164 // Create the pre-increment of the iteration variable. 5165 Expr *Increment 5166 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5167 VK_LValue, OK_Ordinary, Loc); 5168 5169 // Subscript the "from" and "to" expressions with the iteration variable. 5170 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5171 IterationVarRef, Loc)); 5172 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5173 IterationVarRef, Loc)); 5174 5175 // Build the copy for an individual element of the array. 5176 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5177 To, From, CopyingBaseSubobject, 5178 Depth + 1); 5179 if (Copy.isInvalid()) 5180 return StmtError(); 5181 5182 // Construct the loop that copies all elements of this array. 5183 return S.ActOnForStmt(Loc, Loc, InitStmt, 5184 S.MakeFullExpr(Comparison), 5185 0, S.MakeFullExpr(Increment), 5186 Loc, Copy.take()); 5187} 5188 5189/// \brief Determine whether the given class has a copy assignment operator 5190/// that accepts a const-qualified argument. 5191static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5192 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5193 5194 if (!Class->hasDeclaredCopyAssignment()) 5195 S.DeclareImplicitCopyAssignment(Class); 5196 5197 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5198 DeclarationName OpName 5199 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5200 5201 DeclContext::lookup_const_iterator Op, OpEnd; 5202 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5203 // C++ [class.copy]p9: 5204 // A user-declared copy assignment operator is a non-static non-template 5205 // member function of class X with exactly one parameter of type X, X&, 5206 // const X&, volatile X& or const volatile X&. 5207 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5208 if (!Method) 5209 continue; 5210 5211 if (Method->isStatic()) 5212 continue; 5213 if (Method->getPrimaryTemplate()) 5214 continue; 5215 const FunctionProtoType *FnType = 5216 Method->getType()->getAs<FunctionProtoType>(); 5217 assert(FnType && "Overloaded operator has no prototype."); 5218 // Don't assert on this; an invalid decl might have been left in the AST. 5219 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5220 continue; 5221 bool AcceptsConst = true; 5222 QualType ArgType = FnType->getArgType(0); 5223 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5224 ArgType = Ref->getPointeeType(); 5225 // Is it a non-const lvalue reference? 5226 if (!ArgType.isConstQualified()) 5227 AcceptsConst = false; 5228 } 5229 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5230 continue; 5231 5232 // We have a single argument of type cv X or cv X&, i.e. we've found the 5233 // copy assignment operator. Return whether it accepts const arguments. 5234 return AcceptsConst; 5235 } 5236 assert(Class->isInvalidDecl() && 5237 "No copy assignment operator declared in valid code."); 5238 return false; 5239} 5240 5241CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5242 // Note: The following rules are largely analoguous to the copy 5243 // constructor rules. Note that virtual bases are not taken into account 5244 // for determining the argument type of the operator. Note also that 5245 // operators taking an object instead of a reference are allowed. 5246 5247 5248 // C++ [class.copy]p10: 5249 // If the class definition does not explicitly declare a copy 5250 // assignment operator, one is declared implicitly. 5251 // The implicitly-defined copy assignment operator for a class X 5252 // will have the form 5253 // 5254 // X& X::operator=(const X&) 5255 // 5256 // if 5257 bool HasConstCopyAssignment = true; 5258 5259 // -- each direct base class B of X has a copy assignment operator 5260 // whose parameter is of type const B&, const volatile B& or B, 5261 // and 5262 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5263 BaseEnd = ClassDecl->bases_end(); 5264 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5265 assert(!Base->getType()->isDependentType() && 5266 "Cannot generate implicit members for class with dependent bases."); 5267 const CXXRecordDecl *BaseClassDecl 5268 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5269 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5270 } 5271 5272 // -- for all the nonstatic data members of X that are of a class 5273 // type M (or array thereof), each such class type has a copy 5274 // assignment operator whose parameter is of type const M&, 5275 // const volatile M& or M. 5276 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5277 FieldEnd = ClassDecl->field_end(); 5278 HasConstCopyAssignment && Field != FieldEnd; 5279 ++Field) { 5280 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5281 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5282 const CXXRecordDecl *FieldClassDecl 5283 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5284 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5285 } 5286 } 5287 5288 // Otherwise, the implicitly declared copy assignment operator will 5289 // have the form 5290 // 5291 // X& X::operator=(X&) 5292 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5293 QualType RetType = Context.getLValueReferenceType(ArgType); 5294 if (HasConstCopyAssignment) 5295 ArgType = ArgType.withConst(); 5296 ArgType = Context.getLValueReferenceType(ArgType); 5297 5298 // C++ [except.spec]p14: 5299 // An implicitly declared special member function (Clause 12) shall have an 5300 // exception-specification. [...] 5301 ImplicitExceptionSpecification ExceptSpec(Context); 5302 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5303 BaseEnd = ClassDecl->bases_end(); 5304 Base != BaseEnd; ++Base) { 5305 CXXRecordDecl *BaseClassDecl 5306 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5307 5308 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5309 DeclareImplicitCopyAssignment(BaseClassDecl); 5310 5311 if (CXXMethodDecl *CopyAssign 5312 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5313 ExceptSpec.CalledDecl(CopyAssign); 5314 } 5315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5316 FieldEnd = ClassDecl->field_end(); 5317 Field != FieldEnd; 5318 ++Field) { 5319 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5320 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5321 CXXRecordDecl *FieldClassDecl 5322 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5323 5324 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5325 DeclareImplicitCopyAssignment(FieldClassDecl); 5326 5327 if (CXXMethodDecl *CopyAssign 5328 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5329 ExceptSpec.CalledDecl(CopyAssign); 5330 } 5331 } 5332 5333 // An implicitly-declared copy assignment operator is an inline public 5334 // member of its class. 5335 FunctionProtoType::ExtProtoInfo EPI; 5336 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5337 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5338 EPI.NumExceptions = ExceptSpec.size(); 5339 EPI.Exceptions = ExceptSpec.data(); 5340 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5341 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5342 CXXMethodDecl *CopyAssignment 5343 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5344 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5345 /*TInfo=*/0, /*isStatic=*/false, 5346 /*StorageClassAsWritten=*/SC_None, 5347 /*isInline=*/true); 5348 CopyAssignment->setAccess(AS_public); 5349 CopyAssignment->setImplicit(); 5350 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5351 5352 // Add the parameter to the operator. 5353 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5354 ClassDecl->getLocation(), 5355 /*Id=*/0, 5356 ArgType, /*TInfo=*/0, 5357 SC_None, 5358 SC_None, 0); 5359 CopyAssignment->setParams(&FromParam, 1); 5360 5361 // Note that we have added this copy-assignment operator. 5362 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5363 5364 if (Scope *S = getScopeForContext(ClassDecl)) 5365 PushOnScopeChains(CopyAssignment, S, false); 5366 ClassDecl->addDecl(CopyAssignment); 5367 5368 AddOverriddenMethods(ClassDecl, CopyAssignment); 5369 return CopyAssignment; 5370} 5371 5372void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5373 CXXMethodDecl *CopyAssignOperator) { 5374 assert((CopyAssignOperator->isImplicit() && 5375 CopyAssignOperator->isOverloadedOperator() && 5376 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5377 !CopyAssignOperator->isUsed(false)) && 5378 "DefineImplicitCopyAssignment called for wrong function"); 5379 5380 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5381 5382 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5383 CopyAssignOperator->setInvalidDecl(); 5384 return; 5385 } 5386 5387 CopyAssignOperator->setUsed(); 5388 5389 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5390 DiagnosticErrorTrap Trap(Diags); 5391 5392 // C++0x [class.copy]p30: 5393 // The implicitly-defined or explicitly-defaulted copy assignment operator 5394 // for a non-union class X performs memberwise copy assignment of its 5395 // subobjects. The direct base classes of X are assigned first, in the 5396 // order of their declaration in the base-specifier-list, and then the 5397 // immediate non-static data members of X are assigned, in the order in 5398 // which they were declared in the class definition. 5399 5400 // The statements that form the synthesized function body. 5401 ASTOwningVector<Stmt*> Statements(*this); 5402 5403 // The parameter for the "other" object, which we are copying from. 5404 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5405 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5406 QualType OtherRefType = Other->getType(); 5407 if (const LValueReferenceType *OtherRef 5408 = OtherRefType->getAs<LValueReferenceType>()) { 5409 OtherRefType = OtherRef->getPointeeType(); 5410 OtherQuals = OtherRefType.getQualifiers(); 5411 } 5412 5413 // Our location for everything implicitly-generated. 5414 SourceLocation Loc = CopyAssignOperator->getLocation(); 5415 5416 // Construct a reference to the "other" object. We'll be using this 5417 // throughout the generated ASTs. 5418 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5419 assert(OtherRef && "Reference to parameter cannot fail!"); 5420 5421 // Construct the "this" pointer. We'll be using this throughout the generated 5422 // ASTs. 5423 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5424 assert(This && "Reference to this cannot fail!"); 5425 5426 // Assign base classes. 5427 bool Invalid = false; 5428 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5429 E = ClassDecl->bases_end(); Base != E; ++Base) { 5430 // Form the assignment: 5431 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5432 QualType BaseType = Base->getType().getUnqualifiedType(); 5433 if (!BaseType->isRecordType()) { 5434 Invalid = true; 5435 continue; 5436 } 5437 5438 CXXCastPath BasePath; 5439 BasePath.push_back(Base); 5440 5441 // Construct the "from" expression, which is an implicit cast to the 5442 // appropriately-qualified base type. 5443 Expr *From = OtherRef; 5444 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5445 CK_UncheckedDerivedToBase, 5446 VK_LValue, &BasePath); 5447 5448 // Dereference "this". 5449 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5450 5451 // Implicitly cast "this" to the appropriately-qualified base type. 5452 Expr *ToE = To.takeAs<Expr>(); 5453 ImpCastExprToType(ToE, 5454 Context.getCVRQualifiedType(BaseType, 5455 CopyAssignOperator->getTypeQualifiers()), 5456 CK_UncheckedDerivedToBase, 5457 VK_LValue, &BasePath); 5458 To = Owned(ToE); 5459 5460 // Build the copy. 5461 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5462 To.get(), From, 5463 /*CopyingBaseSubobject=*/true); 5464 if (Copy.isInvalid()) { 5465 Diag(CurrentLocation, diag::note_member_synthesized_at) 5466 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5467 CopyAssignOperator->setInvalidDecl(); 5468 return; 5469 } 5470 5471 // Success! Record the copy. 5472 Statements.push_back(Copy.takeAs<Expr>()); 5473 } 5474 5475 // \brief Reference to the __builtin_memcpy function. 5476 Expr *BuiltinMemCpyRef = 0; 5477 // \brief Reference to the __builtin_objc_memmove_collectable function. 5478 Expr *CollectableMemCpyRef = 0; 5479 5480 // Assign non-static members. 5481 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5482 FieldEnd = ClassDecl->field_end(); 5483 Field != FieldEnd; ++Field) { 5484 // Check for members of reference type; we can't copy those. 5485 if (Field->getType()->isReferenceType()) { 5486 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5487 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5488 Diag(Field->getLocation(), diag::note_declared_at); 5489 Diag(CurrentLocation, diag::note_member_synthesized_at) 5490 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5491 Invalid = true; 5492 continue; 5493 } 5494 5495 // Check for members of const-qualified, non-class type. 5496 QualType BaseType = Context.getBaseElementType(Field->getType()); 5497 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5498 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5499 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5500 Diag(Field->getLocation(), diag::note_declared_at); 5501 Diag(CurrentLocation, diag::note_member_synthesized_at) 5502 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5503 Invalid = true; 5504 continue; 5505 } 5506 5507 QualType FieldType = Field->getType().getNonReferenceType(); 5508 if (FieldType->isIncompleteArrayType()) { 5509 assert(ClassDecl->hasFlexibleArrayMember() && 5510 "Incomplete array type is not valid"); 5511 continue; 5512 } 5513 5514 // Build references to the field in the object we're copying from and to. 5515 CXXScopeSpec SS; // Intentionally empty 5516 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5517 LookupMemberName); 5518 MemberLookup.addDecl(*Field); 5519 MemberLookup.resolveKind(); 5520 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5521 Loc, /*IsArrow=*/false, 5522 SS, 0, MemberLookup, 0); 5523 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5524 Loc, /*IsArrow=*/true, 5525 SS, 0, MemberLookup, 0); 5526 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5527 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5528 5529 // If the field should be copied with __builtin_memcpy rather than via 5530 // explicit assignments, do so. This optimization only applies for arrays 5531 // of scalars and arrays of class type with trivial copy-assignment 5532 // operators. 5533 if (FieldType->isArrayType() && 5534 (!BaseType->isRecordType() || 5535 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5536 ->hasTrivialCopyAssignment())) { 5537 // Compute the size of the memory buffer to be copied. 5538 QualType SizeType = Context.getSizeType(); 5539 llvm::APInt Size(Context.getTypeSize(SizeType), 5540 Context.getTypeSizeInChars(BaseType).getQuantity()); 5541 for (const ConstantArrayType *Array 5542 = Context.getAsConstantArrayType(FieldType); 5543 Array; 5544 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5545 llvm::APInt ArraySize 5546 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5547 Size *= ArraySize; 5548 } 5549 5550 // Take the address of the field references for "from" and "to". 5551 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5552 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5553 5554 bool NeedsCollectableMemCpy = 5555 (BaseType->isRecordType() && 5556 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5557 5558 if (NeedsCollectableMemCpy) { 5559 if (!CollectableMemCpyRef) { 5560 // Create a reference to the __builtin_objc_memmove_collectable function. 5561 LookupResult R(*this, 5562 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5563 Loc, LookupOrdinaryName); 5564 LookupName(R, TUScope, true); 5565 5566 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5567 if (!CollectableMemCpy) { 5568 // Something went horribly wrong earlier, and we will have 5569 // complained about it. 5570 Invalid = true; 5571 continue; 5572 } 5573 5574 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5575 CollectableMemCpy->getType(), 5576 VK_LValue, Loc, 0).take(); 5577 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5578 } 5579 } 5580 // Create a reference to the __builtin_memcpy builtin function. 5581 else if (!BuiltinMemCpyRef) { 5582 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5583 LookupOrdinaryName); 5584 LookupName(R, TUScope, true); 5585 5586 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5587 if (!BuiltinMemCpy) { 5588 // Something went horribly wrong earlier, and we will have complained 5589 // about it. 5590 Invalid = true; 5591 continue; 5592 } 5593 5594 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5595 BuiltinMemCpy->getType(), 5596 VK_LValue, Loc, 0).take(); 5597 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5598 } 5599 5600 ASTOwningVector<Expr*> CallArgs(*this); 5601 CallArgs.push_back(To.takeAs<Expr>()); 5602 CallArgs.push_back(From.takeAs<Expr>()); 5603 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5604 ExprResult Call = ExprError(); 5605 if (NeedsCollectableMemCpy) 5606 Call = ActOnCallExpr(/*Scope=*/0, 5607 CollectableMemCpyRef, 5608 Loc, move_arg(CallArgs), 5609 Loc); 5610 else 5611 Call = ActOnCallExpr(/*Scope=*/0, 5612 BuiltinMemCpyRef, 5613 Loc, move_arg(CallArgs), 5614 Loc); 5615 5616 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5617 Statements.push_back(Call.takeAs<Expr>()); 5618 continue; 5619 } 5620 5621 // Build the copy of this field. 5622 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5623 To.get(), From.get(), 5624 /*CopyingBaseSubobject=*/false); 5625 if (Copy.isInvalid()) { 5626 Diag(CurrentLocation, diag::note_member_synthesized_at) 5627 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5628 CopyAssignOperator->setInvalidDecl(); 5629 return; 5630 } 5631 5632 // Success! Record the copy. 5633 Statements.push_back(Copy.takeAs<Stmt>()); 5634 } 5635 5636 if (!Invalid) { 5637 // Add a "return *this;" 5638 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5639 5640 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5641 if (Return.isInvalid()) 5642 Invalid = true; 5643 else { 5644 Statements.push_back(Return.takeAs<Stmt>()); 5645 5646 if (Trap.hasErrorOccurred()) { 5647 Diag(CurrentLocation, diag::note_member_synthesized_at) 5648 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5649 Invalid = true; 5650 } 5651 } 5652 } 5653 5654 if (Invalid) { 5655 CopyAssignOperator->setInvalidDecl(); 5656 return; 5657 } 5658 5659 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5660 /*isStmtExpr=*/false); 5661 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5662 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5663} 5664 5665CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5666 CXXRecordDecl *ClassDecl) { 5667 // C++ [class.copy]p4: 5668 // If the class definition does not explicitly declare a copy 5669 // constructor, one is declared implicitly. 5670 5671 // C++ [class.copy]p5: 5672 // The implicitly-declared copy constructor for a class X will 5673 // have the form 5674 // 5675 // X::X(const X&) 5676 // 5677 // if 5678 bool HasConstCopyConstructor = true; 5679 5680 // -- each direct or virtual base class B of X has a copy 5681 // constructor whose first parameter is of type const B& or 5682 // const volatile B&, and 5683 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5684 BaseEnd = ClassDecl->bases_end(); 5685 HasConstCopyConstructor && Base != BaseEnd; 5686 ++Base) { 5687 // Virtual bases are handled below. 5688 if (Base->isVirtual()) 5689 continue; 5690 5691 CXXRecordDecl *BaseClassDecl 5692 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5693 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5694 DeclareImplicitCopyConstructor(BaseClassDecl); 5695 5696 HasConstCopyConstructor 5697 = BaseClassDecl->hasConstCopyConstructor(Context); 5698 } 5699 5700 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5701 BaseEnd = ClassDecl->vbases_end(); 5702 HasConstCopyConstructor && Base != BaseEnd; 5703 ++Base) { 5704 CXXRecordDecl *BaseClassDecl 5705 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5706 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5707 DeclareImplicitCopyConstructor(BaseClassDecl); 5708 5709 HasConstCopyConstructor 5710 = BaseClassDecl->hasConstCopyConstructor(Context); 5711 } 5712 5713 // -- for all the nonstatic data members of X that are of a 5714 // class type M (or array thereof), each such class type 5715 // has a copy constructor whose first parameter is of type 5716 // const M& or const volatile M&. 5717 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5718 FieldEnd = ClassDecl->field_end(); 5719 HasConstCopyConstructor && Field != FieldEnd; 5720 ++Field) { 5721 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5722 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5723 CXXRecordDecl *FieldClassDecl 5724 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5725 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5726 DeclareImplicitCopyConstructor(FieldClassDecl); 5727 5728 HasConstCopyConstructor 5729 = FieldClassDecl->hasConstCopyConstructor(Context); 5730 } 5731 } 5732 5733 // Otherwise, the implicitly declared copy constructor will have 5734 // the form 5735 // 5736 // X::X(X&) 5737 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5738 QualType ArgType = ClassType; 5739 if (HasConstCopyConstructor) 5740 ArgType = ArgType.withConst(); 5741 ArgType = Context.getLValueReferenceType(ArgType); 5742 5743 // C++ [except.spec]p14: 5744 // An implicitly declared special member function (Clause 12) shall have an 5745 // exception-specification. [...] 5746 ImplicitExceptionSpecification ExceptSpec(Context); 5747 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5748 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5749 BaseEnd = ClassDecl->bases_end(); 5750 Base != BaseEnd; 5751 ++Base) { 5752 // Virtual bases are handled below. 5753 if (Base->isVirtual()) 5754 continue; 5755 5756 CXXRecordDecl *BaseClassDecl 5757 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5758 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5759 DeclareImplicitCopyConstructor(BaseClassDecl); 5760 5761 if (CXXConstructorDecl *CopyConstructor 5762 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5763 ExceptSpec.CalledDecl(CopyConstructor); 5764 } 5765 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5766 BaseEnd = ClassDecl->vbases_end(); 5767 Base != BaseEnd; 5768 ++Base) { 5769 CXXRecordDecl *BaseClassDecl 5770 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5771 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5772 DeclareImplicitCopyConstructor(BaseClassDecl); 5773 5774 if (CXXConstructorDecl *CopyConstructor 5775 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5776 ExceptSpec.CalledDecl(CopyConstructor); 5777 } 5778 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5779 FieldEnd = ClassDecl->field_end(); 5780 Field != FieldEnd; 5781 ++Field) { 5782 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5783 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5784 CXXRecordDecl *FieldClassDecl 5785 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5786 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5787 DeclareImplicitCopyConstructor(FieldClassDecl); 5788 5789 if (CXXConstructorDecl *CopyConstructor 5790 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5791 ExceptSpec.CalledDecl(CopyConstructor); 5792 } 5793 } 5794 5795 // An implicitly-declared copy constructor is an inline public 5796 // member of its class. 5797 FunctionProtoType::ExtProtoInfo EPI; 5798 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5799 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5800 EPI.NumExceptions = ExceptSpec.size(); 5801 EPI.Exceptions = ExceptSpec.data(); 5802 DeclarationName Name 5803 = Context.DeclarationNames.getCXXConstructorName( 5804 Context.getCanonicalType(ClassType)); 5805 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5806 CXXConstructorDecl *CopyConstructor 5807 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5808 Context.getFunctionType(Context.VoidTy, 5809 &ArgType, 1, EPI), 5810 /*TInfo=*/0, 5811 /*isExplicit=*/false, 5812 /*isInline=*/true, 5813 /*isImplicitlyDeclared=*/true); 5814 CopyConstructor->setAccess(AS_public); 5815 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5816 5817 // Note that we have declared this constructor. 5818 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5819 5820 // Add the parameter to the constructor. 5821 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5822 ClassDecl->getLocation(), 5823 /*IdentifierInfo=*/0, 5824 ArgType, /*TInfo=*/0, 5825 SC_None, 5826 SC_None, 0); 5827 CopyConstructor->setParams(&FromParam, 1); 5828 if (Scope *S = getScopeForContext(ClassDecl)) 5829 PushOnScopeChains(CopyConstructor, S, false); 5830 ClassDecl->addDecl(CopyConstructor); 5831 5832 return CopyConstructor; 5833} 5834 5835void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5836 CXXConstructorDecl *CopyConstructor, 5837 unsigned TypeQuals) { 5838 assert((CopyConstructor->isImplicit() && 5839 CopyConstructor->isCopyConstructor(TypeQuals) && 5840 !CopyConstructor->isUsed(false)) && 5841 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5842 5843 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5844 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5845 5846 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5847 DiagnosticErrorTrap Trap(Diags); 5848 5849 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5850 Trap.hasErrorOccurred()) { 5851 Diag(CurrentLocation, diag::note_member_synthesized_at) 5852 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5853 CopyConstructor->setInvalidDecl(); 5854 } else { 5855 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5856 CopyConstructor->getLocation(), 5857 MultiStmtArg(*this, 0, 0), 5858 /*isStmtExpr=*/false) 5859 .takeAs<Stmt>()); 5860 } 5861 5862 CopyConstructor->setUsed(); 5863} 5864 5865ExprResult 5866Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5867 CXXConstructorDecl *Constructor, 5868 MultiExprArg ExprArgs, 5869 bool RequiresZeroInit, 5870 unsigned ConstructKind, 5871 SourceRange ParenRange) { 5872 bool Elidable = false; 5873 5874 // C++0x [class.copy]p34: 5875 // When certain criteria are met, an implementation is allowed to 5876 // omit the copy/move construction of a class object, even if the 5877 // copy/move constructor and/or destructor for the object have 5878 // side effects. [...] 5879 // - when a temporary class object that has not been bound to a 5880 // reference (12.2) would be copied/moved to a class object 5881 // with the same cv-unqualified type, the copy/move operation 5882 // can be omitted by constructing the temporary object 5883 // directly into the target of the omitted copy/move 5884 if (ConstructKind == CXXConstructExpr::CK_Complete && 5885 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5886 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5887 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5888 } 5889 5890 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5891 Elidable, move(ExprArgs), RequiresZeroInit, 5892 ConstructKind, ParenRange); 5893} 5894 5895/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5896/// including handling of its default argument expressions. 5897ExprResult 5898Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5899 CXXConstructorDecl *Constructor, bool Elidable, 5900 MultiExprArg ExprArgs, 5901 bool RequiresZeroInit, 5902 unsigned ConstructKind, 5903 SourceRange ParenRange) { 5904 unsigned NumExprs = ExprArgs.size(); 5905 Expr **Exprs = (Expr **)ExprArgs.release(); 5906 5907 MarkDeclarationReferenced(ConstructLoc, Constructor); 5908 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5909 Constructor, Elidable, Exprs, NumExprs, 5910 RequiresZeroInit, 5911 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5912 ParenRange)); 5913} 5914 5915bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5916 CXXConstructorDecl *Constructor, 5917 MultiExprArg Exprs) { 5918 // FIXME: Provide the correct paren SourceRange when available. 5919 ExprResult TempResult = 5920 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5921 move(Exprs), false, CXXConstructExpr::CK_Complete, 5922 SourceRange()); 5923 if (TempResult.isInvalid()) 5924 return true; 5925 5926 Expr *Temp = TempResult.takeAs<Expr>(); 5927 CheckImplicitConversions(Temp, VD->getLocation()); 5928 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5929 Temp = MaybeCreateExprWithCleanups(Temp); 5930 VD->setInit(Temp); 5931 5932 return false; 5933} 5934 5935void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5936 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5937 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5938 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5939 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5940 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5941 CheckDestructorAccess(VD->getLocation(), Destructor, 5942 PDiag(diag::err_access_dtor_var) 5943 << VD->getDeclName() 5944 << VD->getType()); 5945 5946 // TODO: this should be re-enabled for static locals by !CXAAtExit 5947 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5948 Diag(VD->getLocation(), diag::warn_global_destructor); 5949 } 5950} 5951 5952/// AddCXXDirectInitializerToDecl - This action is called immediately after 5953/// ActOnDeclarator, when a C++ direct initializer is present. 5954/// e.g: "int x(1);" 5955void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5956 SourceLocation LParenLoc, 5957 MultiExprArg Exprs, 5958 SourceLocation RParenLoc) { 5959 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5960 5961 // If there is no declaration, there was an error parsing it. Just ignore 5962 // the initializer. 5963 if (RealDecl == 0) 5964 return; 5965 5966 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5967 if (!VDecl) { 5968 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5969 RealDecl->setInvalidDecl(); 5970 return; 5971 } 5972 5973 // We will represent direct-initialization similarly to copy-initialization: 5974 // int x(1); -as-> int x = 1; 5975 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5976 // 5977 // Clients that want to distinguish between the two forms, can check for 5978 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5979 // A major benefit is that clients that don't particularly care about which 5980 // exactly form was it (like the CodeGen) can handle both cases without 5981 // special case code. 5982 5983 // C++ 8.5p11: 5984 // The form of initialization (using parentheses or '=') is generally 5985 // insignificant, but does matter when the entity being initialized has a 5986 // class type. 5987 5988 if (!VDecl->getType()->isDependentType() && 5989 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5990 diag::err_typecheck_decl_incomplete_type)) { 5991 VDecl->setInvalidDecl(); 5992 return; 5993 } 5994 5995 // The variable can not have an abstract class type. 5996 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5997 diag::err_abstract_type_in_decl, 5998 AbstractVariableType)) 5999 VDecl->setInvalidDecl(); 6000 6001 const VarDecl *Def; 6002 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6003 Diag(VDecl->getLocation(), diag::err_redefinition) 6004 << VDecl->getDeclName(); 6005 Diag(Def->getLocation(), diag::note_previous_definition); 6006 VDecl->setInvalidDecl(); 6007 return; 6008 } 6009 6010 // C++ [class.static.data]p4 6011 // If a static data member is of const integral or const 6012 // enumeration type, its declaration in the class definition can 6013 // specify a constant-initializer which shall be an integral 6014 // constant expression (5.19). In that case, the member can appear 6015 // in integral constant expressions. The member shall still be 6016 // defined in a namespace scope if it is used in the program and the 6017 // namespace scope definition shall not contain an initializer. 6018 // 6019 // We already performed a redefinition check above, but for static 6020 // data members we also need to check whether there was an in-class 6021 // declaration with an initializer. 6022 const VarDecl* PrevInit = 0; 6023 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6024 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6025 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6026 return; 6027 } 6028 6029 bool IsDependent = false; 6030 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6031 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6032 VDecl->setInvalidDecl(); 6033 return; 6034 } 6035 6036 if (Exprs.get()[I]->isTypeDependent()) 6037 IsDependent = true; 6038 } 6039 6040 // If either the declaration has a dependent type or if any of the 6041 // expressions is type-dependent, we represent the initialization 6042 // via a ParenListExpr for later use during template instantiation. 6043 if (VDecl->getType()->isDependentType() || IsDependent) { 6044 // Let clients know that initialization was done with a direct initializer. 6045 VDecl->setCXXDirectInitializer(true); 6046 6047 // Store the initialization expressions as a ParenListExpr. 6048 unsigned NumExprs = Exprs.size(); 6049 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6050 (Expr **)Exprs.release(), 6051 NumExprs, RParenLoc)); 6052 return; 6053 } 6054 6055 // Capture the variable that is being initialized and the style of 6056 // initialization. 6057 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6058 6059 // FIXME: Poor source location information. 6060 InitializationKind Kind 6061 = InitializationKind::CreateDirect(VDecl->getLocation(), 6062 LParenLoc, RParenLoc); 6063 6064 InitializationSequence InitSeq(*this, Entity, Kind, 6065 Exprs.get(), Exprs.size()); 6066 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6067 if (Result.isInvalid()) { 6068 VDecl->setInvalidDecl(); 6069 return; 6070 } 6071 6072 CheckImplicitConversions(Result.get(), LParenLoc); 6073 6074 Result = MaybeCreateExprWithCleanups(Result); 6075 VDecl->setInit(Result.takeAs<Expr>()); 6076 VDecl->setCXXDirectInitializer(true); 6077 6078 CheckCompleteVariableDeclaration(VDecl); 6079} 6080 6081/// \brief Given a constructor and the set of arguments provided for the 6082/// constructor, convert the arguments and add any required default arguments 6083/// to form a proper call to this constructor. 6084/// 6085/// \returns true if an error occurred, false otherwise. 6086bool 6087Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6088 MultiExprArg ArgsPtr, 6089 SourceLocation Loc, 6090 ASTOwningVector<Expr*> &ConvertedArgs) { 6091 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6092 unsigned NumArgs = ArgsPtr.size(); 6093 Expr **Args = (Expr **)ArgsPtr.get(); 6094 6095 const FunctionProtoType *Proto 6096 = Constructor->getType()->getAs<FunctionProtoType>(); 6097 assert(Proto && "Constructor without a prototype?"); 6098 unsigned NumArgsInProto = Proto->getNumArgs(); 6099 6100 // If too few arguments are available, we'll fill in the rest with defaults. 6101 if (NumArgs < NumArgsInProto) 6102 ConvertedArgs.reserve(NumArgsInProto); 6103 else 6104 ConvertedArgs.reserve(NumArgs); 6105 6106 VariadicCallType CallType = 6107 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6108 llvm::SmallVector<Expr *, 8> AllArgs; 6109 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6110 Proto, 0, Args, NumArgs, AllArgs, 6111 CallType); 6112 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6113 ConvertedArgs.push_back(AllArgs[i]); 6114 return Invalid; 6115} 6116 6117static inline bool 6118CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6119 const FunctionDecl *FnDecl) { 6120 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6121 if (isa<NamespaceDecl>(DC)) { 6122 return SemaRef.Diag(FnDecl->getLocation(), 6123 diag::err_operator_new_delete_declared_in_namespace) 6124 << FnDecl->getDeclName(); 6125 } 6126 6127 if (isa<TranslationUnitDecl>(DC) && 6128 FnDecl->getStorageClass() == SC_Static) { 6129 return SemaRef.Diag(FnDecl->getLocation(), 6130 diag::err_operator_new_delete_declared_static) 6131 << FnDecl->getDeclName(); 6132 } 6133 6134 return false; 6135} 6136 6137static inline bool 6138CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6139 CanQualType ExpectedResultType, 6140 CanQualType ExpectedFirstParamType, 6141 unsigned DependentParamTypeDiag, 6142 unsigned InvalidParamTypeDiag) { 6143 QualType ResultType = 6144 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6145 6146 // Check that the result type is not dependent. 6147 if (ResultType->isDependentType()) 6148 return SemaRef.Diag(FnDecl->getLocation(), 6149 diag::err_operator_new_delete_dependent_result_type) 6150 << FnDecl->getDeclName() << ExpectedResultType; 6151 6152 // Check that the result type is what we expect. 6153 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6154 return SemaRef.Diag(FnDecl->getLocation(), 6155 diag::err_operator_new_delete_invalid_result_type) 6156 << FnDecl->getDeclName() << ExpectedResultType; 6157 6158 // A function template must have at least 2 parameters. 6159 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6160 return SemaRef.Diag(FnDecl->getLocation(), 6161 diag::err_operator_new_delete_template_too_few_parameters) 6162 << FnDecl->getDeclName(); 6163 6164 // The function decl must have at least 1 parameter. 6165 if (FnDecl->getNumParams() == 0) 6166 return SemaRef.Diag(FnDecl->getLocation(), 6167 diag::err_operator_new_delete_too_few_parameters) 6168 << FnDecl->getDeclName(); 6169 6170 // Check the the first parameter type is not dependent. 6171 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6172 if (FirstParamType->isDependentType()) 6173 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6174 << FnDecl->getDeclName() << ExpectedFirstParamType; 6175 6176 // Check that the first parameter type is what we expect. 6177 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6178 ExpectedFirstParamType) 6179 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6180 << FnDecl->getDeclName() << ExpectedFirstParamType; 6181 6182 return false; 6183} 6184 6185static bool 6186CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6187 // C++ [basic.stc.dynamic.allocation]p1: 6188 // A program is ill-formed if an allocation function is declared in a 6189 // namespace scope other than global scope or declared static in global 6190 // scope. 6191 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6192 return true; 6193 6194 CanQualType SizeTy = 6195 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6196 6197 // C++ [basic.stc.dynamic.allocation]p1: 6198 // The return type shall be void*. The first parameter shall have type 6199 // std::size_t. 6200 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6201 SizeTy, 6202 diag::err_operator_new_dependent_param_type, 6203 diag::err_operator_new_param_type)) 6204 return true; 6205 6206 // C++ [basic.stc.dynamic.allocation]p1: 6207 // The first parameter shall not have an associated default argument. 6208 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6209 return SemaRef.Diag(FnDecl->getLocation(), 6210 diag::err_operator_new_default_arg) 6211 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6212 6213 return false; 6214} 6215 6216static bool 6217CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6218 // C++ [basic.stc.dynamic.deallocation]p1: 6219 // A program is ill-formed if deallocation functions are declared in a 6220 // namespace scope other than global scope or declared static in global 6221 // scope. 6222 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6223 return true; 6224 6225 // C++ [basic.stc.dynamic.deallocation]p2: 6226 // Each deallocation function shall return void and its first parameter 6227 // shall be void*. 6228 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6229 SemaRef.Context.VoidPtrTy, 6230 diag::err_operator_delete_dependent_param_type, 6231 diag::err_operator_delete_param_type)) 6232 return true; 6233 6234 return false; 6235} 6236 6237/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6238/// of this overloaded operator is well-formed. If so, returns false; 6239/// otherwise, emits appropriate diagnostics and returns true. 6240bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6241 assert(FnDecl && FnDecl->isOverloadedOperator() && 6242 "Expected an overloaded operator declaration"); 6243 6244 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6245 6246 // C++ [over.oper]p5: 6247 // The allocation and deallocation functions, operator new, 6248 // operator new[], operator delete and operator delete[], are 6249 // described completely in 3.7.3. The attributes and restrictions 6250 // found in the rest of this subclause do not apply to them unless 6251 // explicitly stated in 3.7.3. 6252 if (Op == OO_Delete || Op == OO_Array_Delete) 6253 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6254 6255 if (Op == OO_New || Op == OO_Array_New) 6256 return CheckOperatorNewDeclaration(*this, FnDecl); 6257 6258 // C++ [over.oper]p6: 6259 // An operator function shall either be a non-static member 6260 // function or be a non-member function and have at least one 6261 // parameter whose type is a class, a reference to a class, an 6262 // enumeration, or a reference to an enumeration. 6263 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6264 if (MethodDecl->isStatic()) 6265 return Diag(FnDecl->getLocation(), 6266 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6267 } else { 6268 bool ClassOrEnumParam = false; 6269 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6270 ParamEnd = FnDecl->param_end(); 6271 Param != ParamEnd; ++Param) { 6272 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6273 if (ParamType->isDependentType() || ParamType->isRecordType() || 6274 ParamType->isEnumeralType()) { 6275 ClassOrEnumParam = true; 6276 break; 6277 } 6278 } 6279 6280 if (!ClassOrEnumParam) 6281 return Diag(FnDecl->getLocation(), 6282 diag::err_operator_overload_needs_class_or_enum) 6283 << FnDecl->getDeclName(); 6284 } 6285 6286 // C++ [over.oper]p8: 6287 // An operator function cannot have default arguments (8.3.6), 6288 // except where explicitly stated below. 6289 // 6290 // Only the function-call operator allows default arguments 6291 // (C++ [over.call]p1). 6292 if (Op != OO_Call) { 6293 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6294 Param != FnDecl->param_end(); ++Param) { 6295 if ((*Param)->hasDefaultArg()) 6296 return Diag((*Param)->getLocation(), 6297 diag::err_operator_overload_default_arg) 6298 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6299 } 6300 } 6301 6302 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6303 { false, false, false } 6304#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6305 , { Unary, Binary, MemberOnly } 6306#include "clang/Basic/OperatorKinds.def" 6307 }; 6308 6309 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6310 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6311 bool MustBeMemberOperator = OperatorUses[Op][2]; 6312 6313 // C++ [over.oper]p8: 6314 // [...] Operator functions cannot have more or fewer parameters 6315 // than the number required for the corresponding operator, as 6316 // described in the rest of this subclause. 6317 unsigned NumParams = FnDecl->getNumParams() 6318 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6319 if (Op != OO_Call && 6320 ((NumParams == 1 && !CanBeUnaryOperator) || 6321 (NumParams == 2 && !CanBeBinaryOperator) || 6322 (NumParams < 1) || (NumParams > 2))) { 6323 // We have the wrong number of parameters. 6324 unsigned ErrorKind; 6325 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6326 ErrorKind = 2; // 2 -> unary or binary. 6327 } else if (CanBeUnaryOperator) { 6328 ErrorKind = 0; // 0 -> unary 6329 } else { 6330 assert(CanBeBinaryOperator && 6331 "All non-call overloaded operators are unary or binary!"); 6332 ErrorKind = 1; // 1 -> binary 6333 } 6334 6335 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6336 << FnDecl->getDeclName() << NumParams << ErrorKind; 6337 } 6338 6339 // Overloaded operators other than operator() cannot be variadic. 6340 if (Op != OO_Call && 6341 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6342 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6343 << FnDecl->getDeclName(); 6344 } 6345 6346 // Some operators must be non-static member functions. 6347 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6348 return Diag(FnDecl->getLocation(), 6349 diag::err_operator_overload_must_be_member) 6350 << FnDecl->getDeclName(); 6351 } 6352 6353 // C++ [over.inc]p1: 6354 // The user-defined function called operator++ implements the 6355 // prefix and postfix ++ operator. If this function is a member 6356 // function with no parameters, or a non-member function with one 6357 // parameter of class or enumeration type, it defines the prefix 6358 // increment operator ++ for objects of that type. If the function 6359 // is a member function with one parameter (which shall be of type 6360 // int) or a non-member function with two parameters (the second 6361 // of which shall be of type int), it defines the postfix 6362 // increment operator ++ for objects of that type. 6363 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6364 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6365 bool ParamIsInt = false; 6366 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6367 ParamIsInt = BT->getKind() == BuiltinType::Int; 6368 6369 if (!ParamIsInt) 6370 return Diag(LastParam->getLocation(), 6371 diag::err_operator_overload_post_incdec_must_be_int) 6372 << LastParam->getType() << (Op == OO_MinusMinus); 6373 } 6374 6375 return false; 6376} 6377 6378/// CheckLiteralOperatorDeclaration - Check whether the declaration 6379/// of this literal operator function is well-formed. If so, returns 6380/// false; otherwise, emits appropriate diagnostics and returns true. 6381bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6382 DeclContext *DC = FnDecl->getDeclContext(); 6383 Decl::Kind Kind = DC->getDeclKind(); 6384 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6385 Kind != Decl::LinkageSpec) { 6386 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6387 << FnDecl->getDeclName(); 6388 return true; 6389 } 6390 6391 bool Valid = false; 6392 6393 // template <char...> type operator "" name() is the only valid template 6394 // signature, and the only valid signature with no parameters. 6395 if (FnDecl->param_size() == 0) { 6396 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6397 // Must have only one template parameter 6398 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6399 if (Params->size() == 1) { 6400 NonTypeTemplateParmDecl *PmDecl = 6401 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6402 6403 // The template parameter must be a char parameter pack. 6404 if (PmDecl && PmDecl->isTemplateParameterPack() && 6405 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6406 Valid = true; 6407 } 6408 } 6409 } else { 6410 // Check the first parameter 6411 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6412 6413 QualType T = (*Param)->getType(); 6414 6415 // unsigned long long int, long double, and any character type are allowed 6416 // as the only parameters. 6417 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6418 Context.hasSameType(T, Context.LongDoubleTy) || 6419 Context.hasSameType(T, Context.CharTy) || 6420 Context.hasSameType(T, Context.WCharTy) || 6421 Context.hasSameType(T, Context.Char16Ty) || 6422 Context.hasSameType(T, Context.Char32Ty)) { 6423 if (++Param == FnDecl->param_end()) 6424 Valid = true; 6425 goto FinishedParams; 6426 } 6427 6428 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6429 const PointerType *PT = T->getAs<PointerType>(); 6430 if (!PT) 6431 goto FinishedParams; 6432 T = PT->getPointeeType(); 6433 if (!T.isConstQualified()) 6434 goto FinishedParams; 6435 T = T.getUnqualifiedType(); 6436 6437 // Move on to the second parameter; 6438 ++Param; 6439 6440 // If there is no second parameter, the first must be a const char * 6441 if (Param == FnDecl->param_end()) { 6442 if (Context.hasSameType(T, Context.CharTy)) 6443 Valid = true; 6444 goto FinishedParams; 6445 } 6446 6447 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6448 // are allowed as the first parameter to a two-parameter function 6449 if (!(Context.hasSameType(T, Context.CharTy) || 6450 Context.hasSameType(T, Context.WCharTy) || 6451 Context.hasSameType(T, Context.Char16Ty) || 6452 Context.hasSameType(T, Context.Char32Ty))) 6453 goto FinishedParams; 6454 6455 // The second and final parameter must be an std::size_t 6456 T = (*Param)->getType().getUnqualifiedType(); 6457 if (Context.hasSameType(T, Context.getSizeType()) && 6458 ++Param == FnDecl->param_end()) 6459 Valid = true; 6460 } 6461 6462 // FIXME: This diagnostic is absolutely terrible. 6463FinishedParams: 6464 if (!Valid) { 6465 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6466 << FnDecl->getDeclName(); 6467 return true; 6468 } 6469 6470 return false; 6471} 6472 6473/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6474/// linkage specification, including the language and (if present) 6475/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6476/// the location of the language string literal, which is provided 6477/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6478/// the '{' brace. Otherwise, this linkage specification does not 6479/// have any braces. 6480Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6481 SourceLocation LangLoc, 6482 llvm::StringRef Lang, 6483 SourceLocation LBraceLoc) { 6484 LinkageSpecDecl::LanguageIDs Language; 6485 if (Lang == "\"C\"") 6486 Language = LinkageSpecDecl::lang_c; 6487 else if (Lang == "\"C++\"") 6488 Language = LinkageSpecDecl::lang_cxx; 6489 else { 6490 Diag(LangLoc, diag::err_bad_language); 6491 return 0; 6492 } 6493 6494 // FIXME: Add all the various semantics of linkage specifications 6495 6496 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6497 LangLoc, Language, 6498 LBraceLoc.isValid()); 6499 CurContext->addDecl(D); 6500 PushDeclContext(S, D); 6501 return D; 6502} 6503 6504/// ActOnFinishLinkageSpecification - Complete the definition of 6505/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6506/// valid, it's the position of the closing '}' brace in a linkage 6507/// specification that uses braces. 6508Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6509 Decl *LinkageSpec, 6510 SourceLocation RBraceLoc) { 6511 if (LinkageSpec) 6512 PopDeclContext(); 6513 return LinkageSpec; 6514} 6515 6516/// \brief Perform semantic analysis for the variable declaration that 6517/// occurs within a C++ catch clause, returning the newly-created 6518/// variable. 6519VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6520 TypeSourceInfo *TInfo, 6521 IdentifierInfo *Name, 6522 SourceLocation Loc) { 6523 bool Invalid = false; 6524 QualType ExDeclType = TInfo->getType(); 6525 6526 // Arrays and functions decay. 6527 if (ExDeclType->isArrayType()) 6528 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6529 else if (ExDeclType->isFunctionType()) 6530 ExDeclType = Context.getPointerType(ExDeclType); 6531 6532 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6533 // The exception-declaration shall not denote a pointer or reference to an 6534 // incomplete type, other than [cv] void*. 6535 // N2844 forbids rvalue references. 6536 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6537 Diag(Loc, diag::err_catch_rvalue_ref); 6538 Invalid = true; 6539 } 6540 6541 // GCC allows catching pointers and references to incomplete types 6542 // as an extension; so do we, but we warn by default. 6543 6544 QualType BaseType = ExDeclType; 6545 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6546 unsigned DK = diag::err_catch_incomplete; 6547 bool IncompleteCatchIsInvalid = true; 6548 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6549 BaseType = Ptr->getPointeeType(); 6550 Mode = 1; 6551 DK = diag::ext_catch_incomplete_ptr; 6552 IncompleteCatchIsInvalid = false; 6553 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6554 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6555 BaseType = Ref->getPointeeType(); 6556 Mode = 2; 6557 DK = diag::ext_catch_incomplete_ref; 6558 IncompleteCatchIsInvalid = false; 6559 } 6560 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6561 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6562 IncompleteCatchIsInvalid) 6563 Invalid = true; 6564 6565 if (!Invalid && !ExDeclType->isDependentType() && 6566 RequireNonAbstractType(Loc, ExDeclType, 6567 diag::err_abstract_type_in_decl, 6568 AbstractVariableType)) 6569 Invalid = true; 6570 6571 // Only the non-fragile NeXT runtime currently supports C++ catches 6572 // of ObjC types, and no runtime supports catching ObjC types by value. 6573 if (!Invalid && getLangOptions().ObjC1) { 6574 QualType T = ExDeclType; 6575 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6576 T = RT->getPointeeType(); 6577 6578 if (T->isObjCObjectType()) { 6579 Diag(Loc, diag::err_objc_object_catch); 6580 Invalid = true; 6581 } else if (T->isObjCObjectPointerType()) { 6582 if (!getLangOptions().NeXTRuntime) { 6583 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6584 Invalid = true; 6585 } else if (!getLangOptions().ObjCNonFragileABI) { 6586 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6587 Invalid = true; 6588 } 6589 } 6590 } 6591 6592 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6593 Name, ExDeclType, TInfo, SC_None, 6594 SC_None); 6595 ExDecl->setExceptionVariable(true); 6596 6597 if (!Invalid) { 6598 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6599 // C++ [except.handle]p16: 6600 // The object declared in an exception-declaration or, if the 6601 // exception-declaration does not specify a name, a temporary (12.2) is 6602 // copy-initialized (8.5) from the exception object. [...] 6603 // The object is destroyed when the handler exits, after the destruction 6604 // of any automatic objects initialized within the handler. 6605 // 6606 // We just pretend to initialize the object with itself, then make sure 6607 // it can be destroyed later. 6608 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6609 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6610 Loc, ExDeclType, VK_LValue, 0); 6611 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6612 SourceLocation()); 6613 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6614 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6615 MultiExprArg(*this, &ExDeclRef, 1)); 6616 if (Result.isInvalid()) 6617 Invalid = true; 6618 else 6619 FinalizeVarWithDestructor(ExDecl, RecordTy); 6620 } 6621 } 6622 6623 if (Invalid) 6624 ExDecl->setInvalidDecl(); 6625 6626 return ExDecl; 6627} 6628 6629/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6630/// handler. 6631Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6632 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6633 bool Invalid = D.isInvalidType(); 6634 6635 // Check for unexpanded parameter packs. 6636 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6637 UPPC_ExceptionType)) { 6638 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6639 D.getIdentifierLoc()); 6640 Invalid = true; 6641 } 6642 6643 IdentifierInfo *II = D.getIdentifier(); 6644 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6645 LookupOrdinaryName, 6646 ForRedeclaration)) { 6647 // The scope should be freshly made just for us. There is just no way 6648 // it contains any previous declaration. 6649 assert(!S->isDeclScope(PrevDecl)); 6650 if (PrevDecl->isTemplateParameter()) { 6651 // Maybe we will complain about the shadowed template parameter. 6652 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6653 } 6654 } 6655 6656 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6657 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6658 << D.getCXXScopeSpec().getRange(); 6659 Invalid = true; 6660 } 6661 6662 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6663 D.getIdentifier(), 6664 D.getIdentifierLoc()); 6665 6666 if (Invalid) 6667 ExDecl->setInvalidDecl(); 6668 6669 // Add the exception declaration into this scope. 6670 if (II) 6671 PushOnScopeChains(ExDecl, S); 6672 else 6673 CurContext->addDecl(ExDecl); 6674 6675 ProcessDeclAttributes(S, ExDecl, D); 6676 return ExDecl; 6677} 6678 6679Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6680 Expr *AssertExpr, 6681 Expr *AssertMessageExpr_) { 6682 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6683 6684 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6685 llvm::APSInt Value(32); 6686 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6687 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6688 AssertExpr->getSourceRange(); 6689 return 0; 6690 } 6691 6692 if (Value == 0) { 6693 Diag(AssertLoc, diag::err_static_assert_failed) 6694 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6695 } 6696 } 6697 6698 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6699 return 0; 6700 6701 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6702 AssertExpr, AssertMessage); 6703 6704 CurContext->addDecl(Decl); 6705 return Decl; 6706} 6707 6708/// \brief Perform semantic analysis of the given friend type declaration. 6709/// 6710/// \returns A friend declaration that. 6711FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6712 TypeSourceInfo *TSInfo) { 6713 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6714 6715 QualType T = TSInfo->getType(); 6716 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6717 6718 if (!getLangOptions().CPlusPlus0x) { 6719 // C++03 [class.friend]p2: 6720 // An elaborated-type-specifier shall be used in a friend declaration 6721 // for a class.* 6722 // 6723 // * The class-key of the elaborated-type-specifier is required. 6724 if (!ActiveTemplateInstantiations.empty()) { 6725 // Do not complain about the form of friend template types during 6726 // template instantiation; we will already have complained when the 6727 // template was declared. 6728 } else if (!T->isElaboratedTypeSpecifier()) { 6729 // If we evaluated the type to a record type, suggest putting 6730 // a tag in front. 6731 if (const RecordType *RT = T->getAs<RecordType>()) { 6732 RecordDecl *RD = RT->getDecl(); 6733 6734 std::string InsertionText = std::string(" ") + RD->getKindName(); 6735 6736 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6737 << (unsigned) RD->getTagKind() 6738 << T 6739 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6740 InsertionText); 6741 } else { 6742 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6743 << T 6744 << SourceRange(FriendLoc, TypeRange.getEnd()); 6745 } 6746 } else if (T->getAs<EnumType>()) { 6747 Diag(FriendLoc, diag::ext_enum_friend) 6748 << T 6749 << SourceRange(FriendLoc, TypeRange.getEnd()); 6750 } 6751 } 6752 6753 // C++0x [class.friend]p3: 6754 // If the type specifier in a friend declaration designates a (possibly 6755 // cv-qualified) class type, that class is declared as a friend; otherwise, 6756 // the friend declaration is ignored. 6757 6758 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6759 // in [class.friend]p3 that we do not implement. 6760 6761 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6762} 6763 6764/// Handle a friend tag declaration where the scope specifier was 6765/// templated. 6766Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6767 unsigned TagSpec, SourceLocation TagLoc, 6768 CXXScopeSpec &SS, 6769 IdentifierInfo *Name, SourceLocation NameLoc, 6770 AttributeList *Attr, 6771 MultiTemplateParamsArg TempParamLists) { 6772 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6773 6774 bool isExplicitSpecialization = false; 6775 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6776 bool Invalid = false; 6777 6778 if (TemplateParameterList *TemplateParams 6779 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6780 TempParamLists.get(), 6781 TempParamLists.size(), 6782 /*friend*/ true, 6783 isExplicitSpecialization, 6784 Invalid)) { 6785 --NumMatchedTemplateParamLists; 6786 6787 if (TemplateParams->size() > 0) { 6788 // This is a declaration of a class template. 6789 if (Invalid) 6790 return 0; 6791 6792 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6793 SS, Name, NameLoc, Attr, 6794 TemplateParams, AS_public).take(); 6795 } else { 6796 // The "template<>" header is extraneous. 6797 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6798 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6799 isExplicitSpecialization = true; 6800 } 6801 } 6802 6803 if (Invalid) return 0; 6804 6805 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6806 6807 bool isAllExplicitSpecializations = true; 6808 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6809 if (TempParamLists.get()[I]->size()) { 6810 isAllExplicitSpecializations = false; 6811 break; 6812 } 6813 } 6814 6815 // FIXME: don't ignore attributes. 6816 6817 // If it's explicit specializations all the way down, just forget 6818 // about the template header and build an appropriate non-templated 6819 // friend. TODO: for source fidelity, remember the headers. 6820 if (isAllExplicitSpecializations) { 6821 ElaboratedTypeKeyword Keyword 6822 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6823 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6824 TagLoc, SS.getRange(), NameLoc); 6825 if (T.isNull()) 6826 return 0; 6827 6828 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6829 if (isa<DependentNameType>(T)) { 6830 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6831 TL.setKeywordLoc(TagLoc); 6832 TL.setQualifierRange(SS.getRange()); 6833 TL.setNameLoc(NameLoc); 6834 } else { 6835 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6836 TL.setKeywordLoc(TagLoc); 6837 TL.setQualifierRange(SS.getRange()); 6838 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6839 } 6840 6841 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6842 TSI, FriendLoc); 6843 Friend->setAccess(AS_public); 6844 CurContext->addDecl(Friend); 6845 return Friend; 6846 } 6847 6848 // Handle the case of a templated-scope friend class. e.g. 6849 // template <class T> class A<T>::B; 6850 // FIXME: we don't support these right now. 6851 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6852 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6853 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6854 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6855 TL.setKeywordLoc(TagLoc); 6856 TL.setQualifierRange(SS.getRange()); 6857 TL.setNameLoc(NameLoc); 6858 6859 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6860 TSI, FriendLoc); 6861 Friend->setAccess(AS_public); 6862 Friend->setUnsupportedFriend(true); 6863 CurContext->addDecl(Friend); 6864 return Friend; 6865} 6866 6867 6868/// Handle a friend type declaration. This works in tandem with 6869/// ActOnTag. 6870/// 6871/// Notes on friend class templates: 6872/// 6873/// We generally treat friend class declarations as if they were 6874/// declaring a class. So, for example, the elaborated type specifier 6875/// in a friend declaration is required to obey the restrictions of a 6876/// class-head (i.e. no typedefs in the scope chain), template 6877/// parameters are required to match up with simple template-ids, &c. 6878/// However, unlike when declaring a template specialization, it's 6879/// okay to refer to a template specialization without an empty 6880/// template parameter declaration, e.g. 6881/// friend class A<T>::B<unsigned>; 6882/// We permit this as a special case; if there are any template 6883/// parameters present at all, require proper matching, i.e. 6884/// template <> template <class T> friend class A<int>::B; 6885Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6886 MultiTemplateParamsArg TempParams) { 6887 SourceLocation Loc = DS.getSourceRange().getBegin(); 6888 6889 assert(DS.isFriendSpecified()); 6890 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6891 6892 // Try to convert the decl specifier to a type. This works for 6893 // friend templates because ActOnTag never produces a ClassTemplateDecl 6894 // for a TUK_Friend. 6895 Declarator TheDeclarator(DS, Declarator::MemberContext); 6896 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6897 QualType T = TSI->getType(); 6898 if (TheDeclarator.isInvalidType()) 6899 return 0; 6900 6901 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6902 return 0; 6903 6904 // This is definitely an error in C++98. It's probably meant to 6905 // be forbidden in C++0x, too, but the specification is just 6906 // poorly written. 6907 // 6908 // The problem is with declarations like the following: 6909 // template <T> friend A<T>::foo; 6910 // where deciding whether a class C is a friend or not now hinges 6911 // on whether there exists an instantiation of A that causes 6912 // 'foo' to equal C. There are restrictions on class-heads 6913 // (which we declare (by fiat) elaborated friend declarations to 6914 // be) that makes this tractable. 6915 // 6916 // FIXME: handle "template <> friend class A<T>;", which 6917 // is possibly well-formed? Who even knows? 6918 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6919 Diag(Loc, diag::err_tagless_friend_type_template) 6920 << DS.getSourceRange(); 6921 return 0; 6922 } 6923 6924 // C++98 [class.friend]p1: A friend of a class is a function 6925 // or class that is not a member of the class . . . 6926 // This is fixed in DR77, which just barely didn't make the C++03 6927 // deadline. It's also a very silly restriction that seriously 6928 // affects inner classes and which nobody else seems to implement; 6929 // thus we never diagnose it, not even in -pedantic. 6930 // 6931 // But note that we could warn about it: it's always useless to 6932 // friend one of your own members (it's not, however, worthless to 6933 // friend a member of an arbitrary specialization of your template). 6934 6935 Decl *D; 6936 if (unsigned NumTempParamLists = TempParams.size()) 6937 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6938 NumTempParamLists, 6939 TempParams.release(), 6940 TSI, 6941 DS.getFriendSpecLoc()); 6942 else 6943 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6944 6945 if (!D) 6946 return 0; 6947 6948 D->setAccess(AS_public); 6949 CurContext->addDecl(D); 6950 6951 return D; 6952} 6953 6954Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6955 MultiTemplateParamsArg TemplateParams) { 6956 const DeclSpec &DS = D.getDeclSpec(); 6957 6958 assert(DS.isFriendSpecified()); 6959 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6960 6961 SourceLocation Loc = D.getIdentifierLoc(); 6962 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6963 QualType T = TInfo->getType(); 6964 6965 // C++ [class.friend]p1 6966 // A friend of a class is a function or class.... 6967 // Note that this sees through typedefs, which is intended. 6968 // It *doesn't* see through dependent types, which is correct 6969 // according to [temp.arg.type]p3: 6970 // If a declaration acquires a function type through a 6971 // type dependent on a template-parameter and this causes 6972 // a declaration that does not use the syntactic form of a 6973 // function declarator to have a function type, the program 6974 // is ill-formed. 6975 if (!T->isFunctionType()) { 6976 Diag(Loc, diag::err_unexpected_friend); 6977 6978 // It might be worthwhile to try to recover by creating an 6979 // appropriate declaration. 6980 return 0; 6981 } 6982 6983 // C++ [namespace.memdef]p3 6984 // - If a friend declaration in a non-local class first declares a 6985 // class or function, the friend class or function is a member 6986 // of the innermost enclosing namespace. 6987 // - The name of the friend is not found by simple name lookup 6988 // until a matching declaration is provided in that namespace 6989 // scope (either before or after the class declaration granting 6990 // friendship). 6991 // - If a friend function is called, its name may be found by the 6992 // name lookup that considers functions from namespaces and 6993 // classes associated with the types of the function arguments. 6994 // - When looking for a prior declaration of a class or a function 6995 // declared as a friend, scopes outside the innermost enclosing 6996 // namespace scope are not considered. 6997 6998 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6999 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7000 DeclarationName Name = NameInfo.getName(); 7001 assert(Name); 7002 7003 // Check for unexpanded parameter packs. 7004 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7005 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7006 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7007 return 0; 7008 7009 // The context we found the declaration in, or in which we should 7010 // create the declaration. 7011 DeclContext *DC; 7012 Scope *DCScope = S; 7013 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7014 ForRedeclaration); 7015 7016 // FIXME: there are different rules in local classes 7017 7018 // There are four cases here. 7019 // - There's no scope specifier, in which case we just go to the 7020 // appropriate scope and look for a function or function template 7021 // there as appropriate. 7022 // Recover from invalid scope qualifiers as if they just weren't there. 7023 if (SS.isInvalid() || !SS.isSet()) { 7024 // C++0x [namespace.memdef]p3: 7025 // If the name in a friend declaration is neither qualified nor 7026 // a template-id and the declaration is a function or an 7027 // elaborated-type-specifier, the lookup to determine whether 7028 // the entity has been previously declared shall not consider 7029 // any scopes outside the innermost enclosing namespace. 7030 // C++0x [class.friend]p11: 7031 // If a friend declaration appears in a local class and the name 7032 // specified is an unqualified name, a prior declaration is 7033 // looked up without considering scopes that are outside the 7034 // innermost enclosing non-class scope. For a friend function 7035 // declaration, if there is no prior declaration, the program is 7036 // ill-formed. 7037 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7038 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7039 7040 // Find the appropriate context according to the above. 7041 DC = CurContext; 7042 while (true) { 7043 // Skip class contexts. If someone can cite chapter and verse 7044 // for this behavior, that would be nice --- it's what GCC and 7045 // EDG do, and it seems like a reasonable intent, but the spec 7046 // really only says that checks for unqualified existing 7047 // declarations should stop at the nearest enclosing namespace, 7048 // not that they should only consider the nearest enclosing 7049 // namespace. 7050 while (DC->isRecord()) 7051 DC = DC->getParent(); 7052 7053 LookupQualifiedName(Previous, DC); 7054 7055 // TODO: decide what we think about using declarations. 7056 if (isLocal || !Previous.empty()) 7057 break; 7058 7059 if (isTemplateId) { 7060 if (isa<TranslationUnitDecl>(DC)) break; 7061 } else { 7062 if (DC->isFileContext()) break; 7063 } 7064 DC = DC->getParent(); 7065 } 7066 7067 // C++ [class.friend]p1: A friend of a class is a function or 7068 // class that is not a member of the class . . . 7069 // C++0x changes this for both friend types and functions. 7070 // Most C++ 98 compilers do seem to give an error here, so 7071 // we do, too. 7072 if (!Previous.empty() && DC->Equals(CurContext) 7073 && !getLangOptions().CPlusPlus0x) 7074 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7075 7076 DCScope = getScopeForDeclContext(S, DC); 7077 7078 // - There's a non-dependent scope specifier, in which case we 7079 // compute it and do a previous lookup there for a function 7080 // or function template. 7081 } else if (!SS.getScopeRep()->isDependent()) { 7082 DC = computeDeclContext(SS); 7083 if (!DC) return 0; 7084 7085 if (RequireCompleteDeclContext(SS, DC)) return 0; 7086 7087 LookupQualifiedName(Previous, DC); 7088 7089 // Ignore things found implicitly in the wrong scope. 7090 // TODO: better diagnostics for this case. Suggesting the right 7091 // qualified scope would be nice... 7092 LookupResult::Filter F = Previous.makeFilter(); 7093 while (F.hasNext()) { 7094 NamedDecl *D = F.next(); 7095 if (!DC->InEnclosingNamespaceSetOf( 7096 D->getDeclContext()->getRedeclContext())) 7097 F.erase(); 7098 } 7099 F.done(); 7100 7101 if (Previous.empty()) { 7102 D.setInvalidType(); 7103 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7104 return 0; 7105 } 7106 7107 // C++ [class.friend]p1: A friend of a class is a function or 7108 // class that is not a member of the class . . . 7109 if (DC->Equals(CurContext)) 7110 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7111 7112 // - There's a scope specifier that does not match any template 7113 // parameter lists, in which case we use some arbitrary context, 7114 // create a method or method template, and wait for instantiation. 7115 // - There's a scope specifier that does match some template 7116 // parameter lists, which we don't handle right now. 7117 } else { 7118 DC = CurContext; 7119 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7120 } 7121 7122 if (!DC->isRecord()) { 7123 // This implies that it has to be an operator or function. 7124 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7125 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7126 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7127 Diag(Loc, diag::err_introducing_special_friend) << 7128 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7129 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7130 return 0; 7131 } 7132 } 7133 7134 bool Redeclaration = false; 7135 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7136 move(TemplateParams), 7137 IsDefinition, 7138 Redeclaration); 7139 if (!ND) return 0; 7140 7141 assert(ND->getDeclContext() == DC); 7142 assert(ND->getLexicalDeclContext() == CurContext); 7143 7144 // Add the function declaration to the appropriate lookup tables, 7145 // adjusting the redeclarations list as necessary. We don't 7146 // want to do this yet if the friending class is dependent. 7147 // 7148 // Also update the scope-based lookup if the target context's 7149 // lookup context is in lexical scope. 7150 if (!CurContext->isDependentContext()) { 7151 DC = DC->getRedeclContext(); 7152 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7153 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7154 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7155 } 7156 7157 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7158 D.getIdentifierLoc(), ND, 7159 DS.getFriendSpecLoc()); 7160 FrD->setAccess(AS_public); 7161 CurContext->addDecl(FrD); 7162 7163 if (ND->isInvalidDecl()) 7164 FrD->setInvalidDecl(); 7165 else { 7166 FunctionDecl *FD; 7167 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7168 FD = FTD->getTemplatedDecl(); 7169 else 7170 FD = cast<FunctionDecl>(ND); 7171 7172 // Mark templated-scope function declarations as unsupported. 7173 if (FD->getNumTemplateParameterLists()) 7174 FrD->setUnsupportedFriend(true); 7175 } 7176 7177 return ND; 7178} 7179 7180void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7181 AdjustDeclIfTemplate(Dcl); 7182 7183 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7184 if (!Fn) { 7185 Diag(DelLoc, diag::err_deleted_non_function); 7186 return; 7187 } 7188 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7189 Diag(DelLoc, diag::err_deleted_decl_not_first); 7190 Diag(Prev->getLocation(), diag::note_previous_declaration); 7191 // If the declaration wasn't the first, we delete the function anyway for 7192 // recovery. 7193 } 7194 Fn->setDeleted(); 7195} 7196 7197static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7198 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7199 Stmt *SubStmt = *CI; 7200 if (!SubStmt) 7201 continue; 7202 if (isa<ReturnStmt>(SubStmt)) 7203 Self.Diag(SubStmt->getSourceRange().getBegin(), 7204 diag::err_return_in_constructor_handler); 7205 if (!isa<Expr>(SubStmt)) 7206 SearchForReturnInStmt(Self, SubStmt); 7207 } 7208} 7209 7210void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7211 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7212 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7213 SearchForReturnInStmt(*this, Handler); 7214 } 7215} 7216 7217bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7218 const CXXMethodDecl *Old) { 7219 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7220 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7221 7222 if (Context.hasSameType(NewTy, OldTy) || 7223 NewTy->isDependentType() || OldTy->isDependentType()) 7224 return false; 7225 7226 // Check if the return types are covariant 7227 QualType NewClassTy, OldClassTy; 7228 7229 /// Both types must be pointers or references to classes. 7230 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7231 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7232 NewClassTy = NewPT->getPointeeType(); 7233 OldClassTy = OldPT->getPointeeType(); 7234 } 7235 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7236 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7237 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7238 NewClassTy = NewRT->getPointeeType(); 7239 OldClassTy = OldRT->getPointeeType(); 7240 } 7241 } 7242 } 7243 7244 // The return types aren't either both pointers or references to a class type. 7245 if (NewClassTy.isNull()) { 7246 Diag(New->getLocation(), 7247 diag::err_different_return_type_for_overriding_virtual_function) 7248 << New->getDeclName() << NewTy << OldTy; 7249 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7250 7251 return true; 7252 } 7253 7254 // C++ [class.virtual]p6: 7255 // If the return type of D::f differs from the return type of B::f, the 7256 // class type in the return type of D::f shall be complete at the point of 7257 // declaration of D::f or shall be the class type D. 7258 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7259 if (!RT->isBeingDefined() && 7260 RequireCompleteType(New->getLocation(), NewClassTy, 7261 PDiag(diag::err_covariant_return_incomplete) 7262 << New->getDeclName())) 7263 return true; 7264 } 7265 7266 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7267 // Check if the new class derives from the old class. 7268 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7269 Diag(New->getLocation(), 7270 diag::err_covariant_return_not_derived) 7271 << New->getDeclName() << NewTy << OldTy; 7272 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7273 return true; 7274 } 7275 7276 // Check if we the conversion from derived to base is valid. 7277 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7278 diag::err_covariant_return_inaccessible_base, 7279 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7280 // FIXME: Should this point to the return type? 7281 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7282 // FIXME: this note won't trigger for delayed access control 7283 // diagnostics, and it's impossible to get an undelayed error 7284 // here from access control during the original parse because 7285 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7286 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7287 return true; 7288 } 7289 } 7290 7291 // The qualifiers of the return types must be the same. 7292 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7293 Diag(New->getLocation(), 7294 diag::err_covariant_return_type_different_qualifications) 7295 << New->getDeclName() << NewTy << OldTy; 7296 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7297 return true; 7298 }; 7299 7300 7301 // The new class type must have the same or less qualifiers as the old type. 7302 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7303 Diag(New->getLocation(), 7304 diag::err_covariant_return_type_class_type_more_qualified) 7305 << New->getDeclName() << NewTy << OldTy; 7306 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7307 return true; 7308 }; 7309 7310 return false; 7311} 7312 7313/// \brief Mark the given method pure. 7314/// 7315/// \param Method the method to be marked pure. 7316/// 7317/// \param InitRange the source range that covers the "0" initializer. 7318bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7319 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7320 Method->setPure(); 7321 return false; 7322 } 7323 7324 if (!Method->isInvalidDecl()) 7325 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7326 << Method->getDeclName() << InitRange; 7327 return true; 7328} 7329 7330/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7331/// an initializer for the out-of-line declaration 'Dcl'. The scope 7332/// is a fresh scope pushed for just this purpose. 7333/// 7334/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7335/// static data member of class X, names should be looked up in the scope of 7336/// class X. 7337void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7338 // If there is no declaration, there was an error parsing it. 7339 if (D == 0) return; 7340 7341 // We should only get called for declarations with scope specifiers, like: 7342 // int foo::bar; 7343 assert(D->isOutOfLine()); 7344 EnterDeclaratorContext(S, D->getDeclContext()); 7345} 7346 7347/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7348/// initializer for the out-of-line declaration 'D'. 7349void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7350 // If there is no declaration, there was an error parsing it. 7351 if (D == 0) return; 7352 7353 assert(D->isOutOfLine()); 7354 ExitDeclaratorContext(S); 7355} 7356 7357/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7358/// C++ if/switch/while/for statement. 7359/// e.g: "if (int x = f()) {...}" 7360DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7361 // C++ 6.4p2: 7362 // The declarator shall not specify a function or an array. 7363 // The type-specifier-seq shall not contain typedef and shall not declare a 7364 // new class or enumeration. 7365 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7366 "Parser allowed 'typedef' as storage class of condition decl."); 7367 7368 TagDecl *OwnedTag = 0; 7369 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7370 QualType Ty = TInfo->getType(); 7371 7372 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7373 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7374 // would be created and CXXConditionDeclExpr wants a VarDecl. 7375 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7376 << D.getSourceRange(); 7377 return DeclResult(); 7378 } else if (OwnedTag && OwnedTag->isDefinition()) { 7379 // The type-specifier-seq shall not declare a new class or enumeration. 7380 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7381 } 7382 7383 Decl *Dcl = ActOnDeclarator(S, D); 7384 if (!Dcl) 7385 return DeclResult(); 7386 7387 return Dcl; 7388} 7389 7390void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7391 bool DefinitionRequired) { 7392 // Ignore any vtable uses in unevaluated operands or for classes that do 7393 // not have a vtable. 7394 if (!Class->isDynamicClass() || Class->isDependentContext() || 7395 CurContext->isDependentContext() || 7396 ExprEvalContexts.back().Context == Unevaluated) 7397 return; 7398 7399 // Try to insert this class into the map. 7400 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7401 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7402 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7403 if (!Pos.second) { 7404 // If we already had an entry, check to see if we are promoting this vtable 7405 // to required a definition. If so, we need to reappend to the VTableUses 7406 // list, since we may have already processed the first entry. 7407 if (DefinitionRequired && !Pos.first->second) { 7408 Pos.first->second = true; 7409 } else { 7410 // Otherwise, we can early exit. 7411 return; 7412 } 7413 } 7414 7415 // Local classes need to have their virtual members marked 7416 // immediately. For all other classes, we mark their virtual members 7417 // at the end of the translation unit. 7418 if (Class->isLocalClass()) 7419 MarkVirtualMembersReferenced(Loc, Class); 7420 else 7421 VTableUses.push_back(std::make_pair(Class, Loc)); 7422} 7423 7424bool Sema::DefineUsedVTables() { 7425 if (VTableUses.empty()) 7426 return false; 7427 7428 // Note: The VTableUses vector could grow as a result of marking 7429 // the members of a class as "used", so we check the size each 7430 // time through the loop and prefer indices (with are stable) to 7431 // iterators (which are not). 7432 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7433 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7434 if (!Class) 7435 continue; 7436 7437 SourceLocation Loc = VTableUses[I].second; 7438 7439 // If this class has a key function, but that key function is 7440 // defined in another translation unit, we don't need to emit the 7441 // vtable even though we're using it. 7442 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7443 if (KeyFunction && !KeyFunction->hasBody()) { 7444 switch (KeyFunction->getTemplateSpecializationKind()) { 7445 case TSK_Undeclared: 7446 case TSK_ExplicitSpecialization: 7447 case TSK_ExplicitInstantiationDeclaration: 7448 // The key function is in another translation unit. 7449 continue; 7450 7451 case TSK_ExplicitInstantiationDefinition: 7452 case TSK_ImplicitInstantiation: 7453 // We will be instantiating the key function. 7454 break; 7455 } 7456 } else if (!KeyFunction) { 7457 // If we have a class with no key function that is the subject 7458 // of an explicit instantiation declaration, suppress the 7459 // vtable; it will live with the explicit instantiation 7460 // definition. 7461 bool IsExplicitInstantiationDeclaration 7462 = Class->getTemplateSpecializationKind() 7463 == TSK_ExplicitInstantiationDeclaration; 7464 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7465 REnd = Class->redecls_end(); 7466 R != REnd; ++R) { 7467 TemplateSpecializationKind TSK 7468 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7469 if (TSK == TSK_ExplicitInstantiationDeclaration) 7470 IsExplicitInstantiationDeclaration = true; 7471 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7472 IsExplicitInstantiationDeclaration = false; 7473 break; 7474 } 7475 } 7476 7477 if (IsExplicitInstantiationDeclaration) 7478 continue; 7479 } 7480 7481 // Mark all of the virtual members of this class as referenced, so 7482 // that we can build a vtable. Then, tell the AST consumer that a 7483 // vtable for this class is required. 7484 MarkVirtualMembersReferenced(Loc, Class); 7485 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7486 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7487 7488 // Optionally warn if we're emitting a weak vtable. 7489 if (Class->getLinkage() == ExternalLinkage && 7490 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7491 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7492 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7493 } 7494 } 7495 VTableUses.clear(); 7496 7497 return true; 7498} 7499 7500void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7501 const CXXRecordDecl *RD) { 7502 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7503 e = RD->method_end(); i != e; ++i) { 7504 CXXMethodDecl *MD = *i; 7505 7506 // C++ [basic.def.odr]p2: 7507 // [...] A virtual member function is used if it is not pure. [...] 7508 if (MD->isVirtual() && !MD->isPure()) 7509 MarkDeclarationReferenced(Loc, MD); 7510 } 7511 7512 // Only classes that have virtual bases need a VTT. 7513 if (RD->getNumVBases() == 0) 7514 return; 7515 7516 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7517 e = RD->bases_end(); i != e; ++i) { 7518 const CXXRecordDecl *Base = 7519 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7520 if (Base->getNumVBases() == 0) 7521 continue; 7522 MarkVirtualMembersReferenced(Loc, Base); 7523 } 7524} 7525 7526/// SetIvarInitializers - This routine builds initialization ASTs for the 7527/// Objective-C implementation whose ivars need be initialized. 7528void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7529 if (!getLangOptions().CPlusPlus) 7530 return; 7531 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7532 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7533 CollectIvarsToConstructOrDestruct(OID, ivars); 7534 if (ivars.empty()) 7535 return; 7536 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7537 for (unsigned i = 0; i < ivars.size(); i++) { 7538 FieldDecl *Field = ivars[i]; 7539 if (Field->isInvalidDecl()) 7540 continue; 7541 7542 CXXCtorInitializer *Member; 7543 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7544 InitializationKind InitKind = 7545 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7546 7547 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7548 ExprResult MemberInit = 7549 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7550 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7551 // Note, MemberInit could actually come back empty if no initialization 7552 // is required (e.g., because it would call a trivial default constructor) 7553 if (!MemberInit.get() || MemberInit.isInvalid()) 7554 continue; 7555 7556 Member = 7557 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7558 SourceLocation(), 7559 MemberInit.takeAs<Expr>(), 7560 SourceLocation()); 7561 AllToInit.push_back(Member); 7562 7563 // Be sure that the destructor is accessible and is marked as referenced. 7564 if (const RecordType *RecordTy 7565 = Context.getBaseElementType(Field->getType()) 7566 ->getAs<RecordType>()) { 7567 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7568 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7569 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7570 CheckDestructorAccess(Field->getLocation(), Destructor, 7571 PDiag(diag::err_access_dtor_ivar) 7572 << Context.getBaseElementType(Field->getType())); 7573 } 7574 } 7575 } 7576 ObjCImplementation->setIvarInitializers(Context, 7577 AllToInit.data(), AllToInit.size()); 7578 } 7579} 7580