SemaDeclCXX.cpp revision 40d96a69c0e1e8c10f92d450c305a7aae696ca9c
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++ [class.derived]p2: 525 // If a class is marked with the class-virt-specifier final and it appears 526 // as a base-type-specifier in a base-clause (10 class.derived), the program 527 // is ill-formed. 528 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 529 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 530 << CXXBaseDecl->getDeclName(); 531 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 532 << CXXBaseDecl->getDeclName(); 533 return 0; 534 } 535 536 if (BaseDecl->isInvalidDecl()) 537 Class->setInvalidDecl(); 538 539 // Create the base specifier. 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543} 544 545/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 546/// one entry in the base class list of a class specifier, for 547/// example: 548/// class foo : public bar, virtual private baz { 549/// 'public bar' and 'virtual private baz' are each base-specifiers. 550BaseResult 551Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 552 bool Virtual, AccessSpecifier Access, 553 ParsedType basetype, SourceLocation BaseLoc, 554 SourceLocation EllipsisLoc) { 555 if (!classdecl) 556 return true; 557 558 AdjustDeclIfTemplate(classdecl); 559 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 560 if (!Class) 561 return true; 562 563 TypeSourceInfo *TInfo = 0; 564 GetTypeFromParser(basetype, &TInfo); 565 566 if (EllipsisLoc.isInvalid() && 567 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 568 UPPC_BaseType)) 569 return true; 570 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, TInfo, 573 EllipsisLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 if (!Class->hasObjectMember()) { 600 if (const RecordType *FDTTy = 601 NewBaseType.getTypePtr()->getAs<RecordType>()) 602 if (FDTTy->getDecl()->hasObjectMember()) 603 Class->setHasObjectMember(true); 604 } 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651static CXXRecordDecl *GetClassForType(QualType T) { 652 if (const RecordType *RT = T->getAs<RecordType>()) 653 return cast<CXXRecordDecl>(RT->getDecl()); 654 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 655 return ICT->getDecl(); 656 else 657 return 0; 658} 659 660/// \brief Determine whether the type \p Derived is a C++ class that is 661/// derived from the type \p Base. 662bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 663 if (!getLangOptions().CPlusPlus) 664 return false; 665 666 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 667 if (!DerivedRD) 668 return false; 669 670 CXXRecordDecl *BaseRD = GetClassForType(Base); 671 if (!BaseRD) 672 return false; 673 674 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 675 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 return DerivedRD->isDerivedFrom(BaseRD, Paths); 693} 694 695void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 696 CXXCastPath &BasePathArray) { 697 assert(BasePathArray.empty() && "Base path array must be empty!"); 698 assert(Paths.isRecordingPaths() && "Must record paths!"); 699 700 const CXXBasePath &Path = Paths.front(); 701 702 // We first go backward and check if we have a virtual base. 703 // FIXME: It would be better if CXXBasePath had the base specifier for 704 // the nearest virtual base. 705 unsigned Start = 0; 706 for (unsigned I = Path.size(); I != 0; --I) { 707 if (Path[I - 1].Base->isVirtual()) { 708 Start = I - 1; 709 break; 710 } 711 } 712 713 // Now add all bases. 714 for (unsigned I = Start, E = Path.size(); I != E; ++I) 715 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 716} 717 718/// \brief Determine whether the given base path includes a virtual 719/// base class. 720bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 721 for (CXXCastPath::const_iterator B = BasePath.begin(), 722 BEnd = BasePath.end(); 723 B != BEnd; ++B) 724 if ((*B)->isVirtual()) 725 return true; 726 727 return false; 728} 729 730/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 731/// conversion (where Derived and Base are class types) is 732/// well-formed, meaning that the conversion is unambiguous (and 733/// that all of the base classes are accessible). Returns true 734/// and emits a diagnostic if the code is ill-formed, returns false 735/// otherwise. Loc is the location where this routine should point to 736/// if there is an error, and Range is the source range to highlight 737/// if there is an error. 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 unsigned InaccessibleBaseID, 741 unsigned AmbigiousBaseConvID, 742 SourceLocation Loc, SourceRange Range, 743 DeclarationName Name, 744 CXXCastPath *BasePath) { 745 // First, determine whether the path from Derived to Base is 746 // ambiguous. This is slightly more expensive than checking whether 747 // the Derived to Base conversion exists, because here we need to 748 // explore multiple paths to determine if there is an ambiguity. 749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 750 /*DetectVirtual=*/false); 751 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 752 assert(DerivationOkay && 753 "Can only be used with a derived-to-base conversion"); 754 (void)DerivationOkay; 755 756 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 757 if (InaccessibleBaseID) { 758 // Check that the base class can be accessed. 759 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 760 InaccessibleBaseID)) { 761 case AR_inaccessible: 762 return true; 763 case AR_accessible: 764 case AR_dependent: 765 case AR_delayed: 766 break; 767 } 768 } 769 770 // Build a base path if necessary. 771 if (BasePath) 772 BuildBasePathArray(Paths, *BasePath); 773 return false; 774 } 775 776 // We know that the derived-to-base conversion is ambiguous, and 777 // we're going to produce a diagnostic. Perform the derived-to-base 778 // search just one more time to compute all of the possible paths so 779 // that we can print them out. This is more expensive than any of 780 // the previous derived-to-base checks we've done, but at this point 781 // performance isn't as much of an issue. 782 Paths.clear(); 783 Paths.setRecordingPaths(true); 784 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 785 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 786 (void)StillOkay; 787 788 // Build up a textual representation of the ambiguous paths, e.g., 789 // D -> B -> A, that will be used to illustrate the ambiguous 790 // conversions in the diagnostic. We only print one of the paths 791 // to each base class subobject. 792 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 793 794 Diag(Loc, AmbigiousBaseConvID) 795 << Derived << Base << PathDisplayStr << Range << Name; 796 return true; 797} 798 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 SourceLocation Loc, SourceRange Range, 802 CXXCastPath *BasePath, 803 bool IgnoreAccess) { 804 return CheckDerivedToBaseConversion(Derived, Base, 805 IgnoreAccess ? 0 806 : diag::err_upcast_to_inaccessible_base, 807 diag::err_ambiguous_derived_to_base_conv, 808 Loc, Range, DeclarationName(), 809 BasePath); 810} 811 812 813/// @brief Builds a string representing ambiguous paths from a 814/// specific derived class to different subobjects of the same base 815/// class. 816/// 817/// This function builds a string that can be used in error messages 818/// to show the different paths that one can take through the 819/// inheritance hierarchy to go from the derived class to different 820/// subobjects of a base class. The result looks something like this: 821/// @code 822/// struct D -> struct B -> struct A 823/// struct D -> struct C -> struct A 824/// @endcode 825std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 826 std::string PathDisplayStr; 827 std::set<unsigned> DisplayedPaths; 828 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 829 Path != Paths.end(); ++Path) { 830 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 831 // We haven't displayed a path to this particular base 832 // class subobject yet. 833 PathDisplayStr += "\n "; 834 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 835 for (CXXBasePath::const_iterator Element = Path->begin(); 836 Element != Path->end(); ++Element) 837 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 838 } 839 } 840 841 return PathDisplayStr; 842} 843 844//===----------------------------------------------------------------------===// 845// C++ class member Handling 846//===----------------------------------------------------------------------===// 847 848/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 849Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 850 SourceLocation ASLoc, 851 SourceLocation ColonLoc) { 852 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 853 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 854 ASLoc, ColonLoc); 855 CurContext->addHiddenDecl(ASDecl); 856 return ASDecl; 857} 858 859/// CheckOverrideControl - Check C++0x override control semantics. 860void Sema::CheckOverrideControl(const Decl *D) { 861 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 862 if (!MD || !MD->isVirtual()) 863 return; 864 865 if (MD->isDependentContext()) 866 return; 867 868 // C++0x [class.virtual]p3: 869 // If a virtual function is marked with the virt-specifier override and does 870 // not override a member function of a base class, 871 // the program is ill-formed. 872 bool HasOverriddenMethods = 873 MD->begin_overridden_methods() != MD->end_overridden_methods(); 874 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 875 Diag(MD->getLocation(), 876 diag::err_function_marked_override_not_overriding) 877 << MD->getDeclName(); 878 return; 879 } 880 881 // C++0x [class.derived]p8: 882 // In a class definition marked with the class-virt-specifier explicit, 883 // if a virtual member function that is neither implicitly-declared nor a 884 // destructor overrides a member function of a base class and it is not 885 // marked with the virt-specifier override, the program is ill-formed. 886 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 887 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 888 llvm::SmallVector<const CXXMethodDecl*, 4> 889 OverriddenMethods(MD->begin_overridden_methods(), 890 MD->end_overridden_methods()); 891 892 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 893 << MD->getDeclName() 894 << (unsigned)OverriddenMethods.size(); 895 896 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 897 Diag(OverriddenMethods[I]->getLocation(), 898 diag::note_overridden_virtual_function); 899 } 900} 901 902/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 903/// function overrides a virtual member function marked 'final', according to 904/// C++0x [class.virtual]p3. 905bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 906 const CXXMethodDecl *Old) { 907 if (!Old->hasAttr<FinalAttr>()) 908 return false; 909 910 Diag(New->getLocation(), diag::err_final_function_overridden) 911 << New->getDeclName(); 912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 913 return true; 914} 915 916/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 917/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 918/// bitfield width if there is one and 'InitExpr' specifies the initializer if 919/// any. 920Decl * 921Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 922 MultiTemplateParamsArg TemplateParameterLists, 923 ExprTy *BW, const VirtSpecifiers &VS, 924 ExprTy *InitExpr, bool IsDefinition, 925 bool Deleted) { 926 const DeclSpec &DS = D.getDeclSpec(); 927 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 928 DeclarationName Name = NameInfo.getName(); 929 SourceLocation Loc = NameInfo.getLoc(); 930 931 // For anonymous bitfields, the location should point to the type. 932 if (Loc.isInvalid()) 933 Loc = D.getSourceRange().getBegin(); 934 935 Expr *BitWidth = static_cast<Expr*>(BW); 936 Expr *Init = static_cast<Expr*>(InitExpr); 937 938 assert(isa<CXXRecordDecl>(CurContext)); 939 assert(!DS.isFriendSpecified()); 940 941 bool isFunc = false; 942 if (D.isFunctionDeclarator()) 943 isFunc = true; 944 else if (D.getNumTypeObjects() == 0 && 945 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 946 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 947 isFunc = TDType->isFunctionType(); 948 } 949 950 // C++ 9.2p6: A member shall not be declared to have automatic storage 951 // duration (auto, register) or with the extern storage-class-specifier. 952 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 953 // data members and cannot be applied to names declared const or static, 954 // and cannot be applied to reference members. 955 switch (DS.getStorageClassSpec()) { 956 case DeclSpec::SCS_unspecified: 957 case DeclSpec::SCS_typedef: 958 case DeclSpec::SCS_static: 959 // FALL THROUGH. 960 break; 961 case DeclSpec::SCS_mutable: 962 if (isFunc) { 963 if (DS.getStorageClassSpecLoc().isValid()) 964 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 965 else 966 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 967 968 // FIXME: It would be nicer if the keyword was ignored only for this 969 // declarator. Otherwise we could get follow-up errors. 970 D.getMutableDeclSpec().ClearStorageClassSpecs(); 971 } 972 break; 973 default: 974 if (DS.getStorageClassSpecLoc().isValid()) 975 Diag(DS.getStorageClassSpecLoc(), 976 diag::err_storageclass_invalid_for_member); 977 else 978 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 979 D.getMutableDeclSpec().ClearStorageClassSpecs(); 980 } 981 982 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 983 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 984 !isFunc); 985 986 Decl *Member; 987 if (isInstField) { 988 CXXScopeSpec &SS = D.getCXXScopeSpec(); 989 990 991 if (SS.isSet() && !SS.isInvalid()) { 992 // The user provided a superfluous scope specifier inside a class 993 // definition: 994 // 995 // class X { 996 // int X::member; 997 // }; 998 DeclContext *DC = 0; 999 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1000 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1001 << Name << FixItHint::CreateRemoval(SS.getRange()); 1002 else 1003 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1004 << Name << SS.getRange(); 1005 1006 SS.clear(); 1007 } 1008 1009 // FIXME: Check for template parameters! 1010 // FIXME: Check that the name is an identifier! 1011 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1012 AS); 1013 assert(Member && "HandleField never returns null"); 1014 } else { 1015 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1016 if (!Member) { 1017 return 0; 1018 } 1019 1020 // Non-instance-fields can't have a bitfield. 1021 if (BitWidth) { 1022 if (Member->isInvalidDecl()) { 1023 // don't emit another diagnostic. 1024 } else if (isa<VarDecl>(Member)) { 1025 // C++ 9.6p3: A bit-field shall not be a static member. 1026 // "static member 'A' cannot be a bit-field" 1027 Diag(Loc, diag::err_static_not_bitfield) 1028 << Name << BitWidth->getSourceRange(); 1029 } else if (isa<TypedefDecl>(Member)) { 1030 // "typedef member 'x' cannot be a bit-field" 1031 Diag(Loc, diag::err_typedef_not_bitfield) 1032 << Name << BitWidth->getSourceRange(); 1033 } else { 1034 // A function typedef ("typedef int f(); f a;"). 1035 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1036 Diag(Loc, diag::err_not_integral_type_bitfield) 1037 << Name << cast<ValueDecl>(Member)->getType() 1038 << BitWidth->getSourceRange(); 1039 } 1040 1041 BitWidth = 0; 1042 Member->setInvalidDecl(); 1043 } 1044 1045 Member->setAccess(AS); 1046 1047 // If we have declared a member function template, set the access of the 1048 // templated declaration as well. 1049 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1050 FunTmpl->getTemplatedDecl()->setAccess(AS); 1051 } 1052 1053 if (VS.isOverrideSpecified()) { 1054 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1055 if (!MD || !MD->isVirtual()) { 1056 Diag(Member->getLocStart(), 1057 diag::override_keyword_only_allowed_on_virtual_member_functions) 1058 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1059 } else 1060 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1061 } 1062 if (VS.isFinalSpecified()) { 1063 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1064 if (!MD || !MD->isVirtual()) { 1065 Diag(Member->getLocStart(), 1066 diag::override_keyword_only_allowed_on_virtual_member_functions) 1067 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1068 } else 1069 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1070 } 1071 1072 CheckOverrideControl(Member); 1073 1074 assert((Name || isInstField) && "No identifier for non-field ?"); 1075 1076 if (Init) 1077 AddInitializerToDecl(Member, Init, false, 1078 DS.getTypeSpecType() == DeclSpec::TST_auto); 1079 if (Deleted) // FIXME: Source location is not very good. 1080 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1081 1082 FinalizeDeclaration(Member); 1083 1084 if (isInstField) 1085 FieldCollector->Add(cast<FieldDecl>(Member)); 1086 return Member; 1087} 1088 1089/// \brief Find the direct and/or virtual base specifiers that 1090/// correspond to the given base type, for use in base initialization 1091/// within a constructor. 1092static bool FindBaseInitializer(Sema &SemaRef, 1093 CXXRecordDecl *ClassDecl, 1094 QualType BaseType, 1095 const CXXBaseSpecifier *&DirectBaseSpec, 1096 const CXXBaseSpecifier *&VirtualBaseSpec) { 1097 // First, check for a direct base class. 1098 DirectBaseSpec = 0; 1099 for (CXXRecordDecl::base_class_const_iterator Base 1100 = ClassDecl->bases_begin(); 1101 Base != ClassDecl->bases_end(); ++Base) { 1102 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1103 // We found a direct base of this type. That's what we're 1104 // initializing. 1105 DirectBaseSpec = &*Base; 1106 break; 1107 } 1108 } 1109 1110 // Check for a virtual base class. 1111 // FIXME: We might be able to short-circuit this if we know in advance that 1112 // there are no virtual bases. 1113 VirtualBaseSpec = 0; 1114 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1115 // We haven't found a base yet; search the class hierarchy for a 1116 // virtual base class. 1117 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1118 /*DetectVirtual=*/false); 1119 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1120 BaseType, Paths)) { 1121 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1122 Path != Paths.end(); ++Path) { 1123 if (Path->back().Base->isVirtual()) { 1124 VirtualBaseSpec = Path->back().Base; 1125 break; 1126 } 1127 } 1128 } 1129 } 1130 1131 return DirectBaseSpec || VirtualBaseSpec; 1132} 1133 1134/// ActOnMemInitializer - Handle a C++ member initializer. 1135MemInitResult 1136Sema::ActOnMemInitializer(Decl *ConstructorD, 1137 Scope *S, 1138 CXXScopeSpec &SS, 1139 IdentifierInfo *MemberOrBase, 1140 ParsedType TemplateTypeTy, 1141 SourceLocation IdLoc, 1142 SourceLocation LParenLoc, 1143 ExprTy **Args, unsigned NumArgs, 1144 SourceLocation RParenLoc, 1145 SourceLocation EllipsisLoc) { 1146 if (!ConstructorD) 1147 return true; 1148 1149 AdjustDeclIfTemplate(ConstructorD); 1150 1151 CXXConstructorDecl *Constructor 1152 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1153 if (!Constructor) { 1154 // The user wrote a constructor initializer on a function that is 1155 // not a C++ constructor. Ignore the error for now, because we may 1156 // have more member initializers coming; we'll diagnose it just 1157 // once in ActOnMemInitializers. 1158 return true; 1159 } 1160 1161 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1162 1163 // C++ [class.base.init]p2: 1164 // Names in a mem-initializer-id are looked up in the scope of the 1165 // constructor's class and, if not found in that scope, are looked 1166 // up in the scope containing the constructor's definition. 1167 // [Note: if the constructor's class contains a member with the 1168 // same name as a direct or virtual base class of the class, a 1169 // mem-initializer-id naming the member or base class and composed 1170 // of a single identifier refers to the class member. A 1171 // mem-initializer-id for the hidden base class may be specified 1172 // using a qualified name. ] 1173 if (!SS.getScopeRep() && !TemplateTypeTy) { 1174 // Look for a member, first. 1175 FieldDecl *Member = 0; 1176 DeclContext::lookup_result Result 1177 = ClassDecl->lookup(MemberOrBase); 1178 if (Result.first != Result.second) { 1179 Member = dyn_cast<FieldDecl>(*Result.first); 1180 1181 if (Member) { 1182 if (EllipsisLoc.isValid()) 1183 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1184 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1185 1186 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1187 LParenLoc, RParenLoc); 1188 } 1189 1190 // Handle anonymous union case. 1191 if (IndirectFieldDecl* IndirectField 1192 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1193 if (EllipsisLoc.isValid()) 1194 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 1197 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1198 NumArgs, IdLoc, 1199 LParenLoc, RParenLoc); 1200 } 1201 } 1202 } 1203 // It didn't name a member, so see if it names a class. 1204 QualType BaseType; 1205 TypeSourceInfo *TInfo = 0; 1206 1207 if (TemplateTypeTy) { 1208 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1209 } else { 1210 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1211 LookupParsedName(R, S, &SS); 1212 1213 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1214 if (!TyD) { 1215 if (R.isAmbiguous()) return true; 1216 1217 // We don't want access-control diagnostics here. 1218 R.suppressDiagnostics(); 1219 1220 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1221 bool NotUnknownSpecialization = false; 1222 DeclContext *DC = computeDeclContext(SS, false); 1223 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1224 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1225 1226 if (!NotUnknownSpecialization) { 1227 // When the scope specifier can refer to a member of an unknown 1228 // specialization, we take it as a type name. 1229 BaseType = CheckTypenameType(ETK_None, 1230 (NestedNameSpecifier *)SS.getScopeRep(), 1231 *MemberOrBase, SourceLocation(), 1232 SS.getRange(), IdLoc); 1233 if (BaseType.isNull()) 1234 return true; 1235 1236 R.clear(); 1237 R.setLookupName(MemberOrBase); 1238 } 1239 } 1240 1241 // If no results were found, try to correct typos. 1242 if (R.empty() && BaseType.isNull() && 1243 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1244 R.isSingleResult()) { 1245 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1246 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1247 // We have found a non-static data member with a similar 1248 // name to what was typed; complain and initialize that 1249 // member. 1250 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1251 << MemberOrBase << true << R.getLookupName() 1252 << FixItHint::CreateReplacement(R.getNameLoc(), 1253 R.getLookupName().getAsString()); 1254 Diag(Member->getLocation(), diag::note_previous_decl) 1255 << Member->getDeclName(); 1256 1257 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1258 LParenLoc, RParenLoc); 1259 } 1260 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1261 const CXXBaseSpecifier *DirectBaseSpec; 1262 const CXXBaseSpecifier *VirtualBaseSpec; 1263 if (FindBaseInitializer(*this, ClassDecl, 1264 Context.getTypeDeclType(Type), 1265 DirectBaseSpec, VirtualBaseSpec)) { 1266 // We have found a direct or virtual base class with a 1267 // similar name to what was typed; complain and initialize 1268 // that base class. 1269 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1270 << MemberOrBase << false << R.getLookupName() 1271 << FixItHint::CreateReplacement(R.getNameLoc(), 1272 R.getLookupName().getAsString()); 1273 1274 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1275 : VirtualBaseSpec; 1276 Diag(BaseSpec->getSourceRange().getBegin(), 1277 diag::note_base_class_specified_here) 1278 << BaseSpec->getType() 1279 << BaseSpec->getSourceRange(); 1280 1281 TyD = Type; 1282 } 1283 } 1284 } 1285 1286 if (!TyD && BaseType.isNull()) { 1287 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1288 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1289 return true; 1290 } 1291 } 1292 1293 if (BaseType.isNull()) { 1294 BaseType = Context.getTypeDeclType(TyD); 1295 if (SS.isSet()) { 1296 NestedNameSpecifier *Qualifier = 1297 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1298 1299 // FIXME: preserve source range information 1300 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1301 } 1302 } 1303 } 1304 1305 if (!TInfo) 1306 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1307 1308 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1309 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1310} 1311 1312/// Checks an initializer expression for use of uninitialized fields, such as 1313/// containing the field that is being initialized. Returns true if there is an 1314/// uninitialized field was used an updates the SourceLocation parameter; false 1315/// otherwise. 1316static bool InitExprContainsUninitializedFields(const Stmt *S, 1317 const ValueDecl *LhsField, 1318 SourceLocation *L) { 1319 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1320 1321 if (isa<CallExpr>(S)) { 1322 // Do not descend into function calls or constructors, as the use 1323 // of an uninitialized field may be valid. One would have to inspect 1324 // the contents of the function/ctor to determine if it is safe or not. 1325 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1326 // may be safe, depending on what the function/ctor does. 1327 return false; 1328 } 1329 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1330 const NamedDecl *RhsField = ME->getMemberDecl(); 1331 1332 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1333 // The member expression points to a static data member. 1334 assert(VD->isStaticDataMember() && 1335 "Member points to non-static data member!"); 1336 (void)VD; 1337 return false; 1338 } 1339 1340 if (isa<EnumConstantDecl>(RhsField)) { 1341 // The member expression points to an enum. 1342 return false; 1343 } 1344 1345 if (RhsField == LhsField) { 1346 // Initializing a field with itself. Throw a warning. 1347 // But wait; there are exceptions! 1348 // Exception #1: The field may not belong to this record. 1349 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1350 const Expr *base = ME->getBase(); 1351 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1352 // Even though the field matches, it does not belong to this record. 1353 return false; 1354 } 1355 // None of the exceptions triggered; return true to indicate an 1356 // uninitialized field was used. 1357 *L = ME->getMemberLoc(); 1358 return true; 1359 } 1360 } else if (isa<SizeOfAlignOfExpr>(S)) { 1361 // sizeof/alignof doesn't reference contents, do not warn. 1362 return false; 1363 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1364 // address-of doesn't reference contents (the pointer may be dereferenced 1365 // in the same expression but it would be rare; and weird). 1366 if (UOE->getOpcode() == UO_AddrOf) 1367 return false; 1368 } 1369 for (Stmt::const_child_range it = S->children(); it; ++it) { 1370 if (!*it) { 1371 // An expression such as 'member(arg ?: "")' may trigger this. 1372 continue; 1373 } 1374 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1375 return true; 1376 } 1377 return false; 1378} 1379 1380MemInitResult 1381Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1382 unsigned NumArgs, SourceLocation IdLoc, 1383 SourceLocation LParenLoc, 1384 SourceLocation RParenLoc) { 1385 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1386 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1387 assert((DirectMember || IndirectMember) && 1388 "Member must be a FieldDecl or IndirectFieldDecl"); 1389 1390 if (Member->isInvalidDecl()) 1391 return true; 1392 1393 // Diagnose value-uses of fields to initialize themselves, e.g. 1394 // foo(foo) 1395 // where foo is not also a parameter to the constructor. 1396 // TODO: implement -Wuninitialized and fold this into that framework. 1397 for (unsigned i = 0; i < NumArgs; ++i) { 1398 SourceLocation L; 1399 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1400 // FIXME: Return true in the case when other fields are used before being 1401 // uninitialized. For example, let this field be the i'th field. When 1402 // initializing the i'th field, throw a warning if any of the >= i'th 1403 // fields are used, as they are not yet initialized. 1404 // Right now we are only handling the case where the i'th field uses 1405 // itself in its initializer. 1406 Diag(L, diag::warn_field_is_uninit); 1407 } 1408 } 1409 1410 bool HasDependentArg = false; 1411 for (unsigned i = 0; i < NumArgs; i++) 1412 HasDependentArg |= Args[i]->isTypeDependent(); 1413 1414 Expr *Init; 1415 if (Member->getType()->isDependentType() || HasDependentArg) { 1416 // Can't check initialization for a member of dependent type or when 1417 // any of the arguments are type-dependent expressions. 1418 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc); 1420 1421 // Erase any temporaries within this evaluation context; we're not 1422 // going to track them in the AST, since we'll be rebuilding the 1423 // ASTs during template instantiation. 1424 ExprTemporaries.erase( 1425 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1426 ExprTemporaries.end()); 1427 } else { 1428 // Initialize the member. 1429 InitializedEntity MemberEntity = 1430 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1431 : InitializedEntity::InitializeMember(IndirectMember, 0); 1432 InitializationKind Kind = 1433 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1434 1435 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1436 1437 ExprResult MemberInit = 1438 InitSeq.Perform(*this, MemberEntity, Kind, 1439 MultiExprArg(*this, Args, NumArgs), 0); 1440 if (MemberInit.isInvalid()) 1441 return true; 1442 1443 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1449 if (MemberInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the member 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) 1460 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1461 RParenLoc); 1462 else 1463 Init = MemberInit.get(); 1464 } 1465 1466 if (DirectMember) { 1467 return new (Context) CXXCtorInitializer(Context, DirectMember, 1468 IdLoc, LParenLoc, Init, 1469 RParenLoc); 1470 } else { 1471 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1472 IdLoc, LParenLoc, Init, 1473 RParenLoc); 1474 } 1475} 1476 1477MemInitResult 1478Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1479 Expr **Args, unsigned NumArgs, 1480 SourceLocation NameLoc, 1481 SourceLocation LParenLoc, 1482 SourceLocation RParenLoc, 1483 CXXRecordDecl *ClassDecl) { 1484 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1485 if (!LangOpts.CPlusPlus0x) 1486 return Diag(Loc, diag::err_delegation_0x_only) 1487 << TInfo->getTypeLoc().getLocalSourceRange(); 1488 1489 // Initialize the object. 1490 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1491 QualType(ClassDecl->getTypeForDecl(), 0)); 1492 InitializationKind Kind = 1493 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1494 1495 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1496 1497 ExprResult DelegationInit = 1498 InitSeq.Perform(*this, DelegationEntity, Kind, 1499 MultiExprArg(*this, Args, NumArgs), 0); 1500 if (DelegationInit.isInvalid()) 1501 return true; 1502 1503 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1504 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1505 assert(Constructor && "Delegating constructor with no target?"); 1506 1507 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1508 1509 // C++0x [class.base.init]p7: 1510 // The initialization of each base and member constitutes a 1511 // full-expression. 1512 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1513 if (DelegationInit.isInvalid()) 1514 return true; 1515 1516 // If we are in a dependent context, template instantiation will 1517 // perform this type-checking again. Just save the arguments that we 1518 // received in a ParenListExpr. 1519 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1520 // of the information that we have about the base 1521 // initializer. However, deconstructing the ASTs is a dicey process, 1522 // and this approach is far more likely to get the corner cases right. 1523 if (CurContext->isDependentContext()) { 1524 ExprResult Init 1525 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1526 NumArgs, RParenLoc)); 1527 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1528 Constructor, Init.takeAs<Expr>(), 1529 RParenLoc); 1530 } 1531 1532 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1533 DelegationInit.takeAs<Expr>(), 1534 RParenLoc); 1535} 1536 1537MemInitResult 1538Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1539 Expr **Args, unsigned NumArgs, 1540 SourceLocation LParenLoc, SourceLocation RParenLoc, 1541 CXXRecordDecl *ClassDecl, 1542 SourceLocation EllipsisLoc) { 1543 bool HasDependentArg = false; 1544 for (unsigned i = 0; i < NumArgs; i++) 1545 HasDependentArg |= Args[i]->isTypeDependent(); 1546 1547 SourceLocation BaseLoc 1548 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1549 1550 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1551 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1552 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1553 1554 // C++ [class.base.init]p2: 1555 // [...] Unless the mem-initializer-id names a nonstatic data 1556 // member of the constructor's class or a direct or virtual base 1557 // of that class, the mem-initializer is ill-formed. A 1558 // mem-initializer-list can initialize a base class using any 1559 // name that denotes that base class type. 1560 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1561 1562 if (EllipsisLoc.isValid()) { 1563 // This is a pack expansion. 1564 if (!BaseType->containsUnexpandedParameterPack()) { 1565 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1566 << SourceRange(BaseLoc, RParenLoc); 1567 1568 EllipsisLoc = SourceLocation(); 1569 } 1570 } else { 1571 // Check for any unexpanded parameter packs. 1572 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1573 return true; 1574 1575 for (unsigned I = 0; I != NumArgs; ++I) 1576 if (DiagnoseUnexpandedParameterPack(Args[I])) 1577 return true; 1578 } 1579 1580 // Check for direct and virtual base classes. 1581 const CXXBaseSpecifier *DirectBaseSpec = 0; 1582 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1583 if (!Dependent) { 1584 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1585 BaseType)) 1586 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1587 LParenLoc, RParenLoc, ClassDecl); 1588 1589 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1590 VirtualBaseSpec); 1591 1592 // C++ [base.class.init]p2: 1593 // Unless the mem-initializer-id names a nonstatic data member of the 1594 // constructor's class or a direct or virtual base of that class, the 1595 // mem-initializer is ill-formed. 1596 if (!DirectBaseSpec && !VirtualBaseSpec) { 1597 // If the class has any dependent bases, then it's possible that 1598 // one of those types will resolve to the same type as 1599 // BaseType. Therefore, just treat this as a dependent base 1600 // class initialization. FIXME: Should we try to check the 1601 // initialization anyway? It seems odd. 1602 if (ClassDecl->hasAnyDependentBases()) 1603 Dependent = true; 1604 else 1605 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1606 << BaseType << Context.getTypeDeclType(ClassDecl) 1607 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1608 } 1609 } 1610 1611 if (Dependent) { 1612 // Can't check initialization for a base of dependent type or when 1613 // any of the arguments are type-dependent expressions. 1614 ExprResult BaseInit 1615 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1616 RParenLoc)); 1617 1618 // Erase any temporaries within this evaluation context; we're not 1619 // going to track them in the AST, since we'll be rebuilding the 1620 // ASTs during template instantiation. 1621 ExprTemporaries.erase( 1622 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1623 ExprTemporaries.end()); 1624 1625 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1626 /*IsVirtual=*/false, 1627 LParenLoc, 1628 BaseInit.takeAs<Expr>(), 1629 RParenLoc, 1630 EllipsisLoc); 1631 } 1632 1633 // C++ [base.class.init]p2: 1634 // If a mem-initializer-id is ambiguous because it designates both 1635 // a direct non-virtual base class and an inherited virtual base 1636 // class, the mem-initializer is ill-formed. 1637 if (DirectBaseSpec && VirtualBaseSpec) 1638 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1639 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1640 1641 CXXBaseSpecifier *BaseSpec 1642 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1643 if (!BaseSpec) 1644 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1645 1646 // Initialize the base. 1647 InitializedEntity BaseEntity = 1648 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1649 InitializationKind Kind = 1650 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1651 1652 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1653 1654 ExprResult BaseInit = 1655 InitSeq.Perform(*this, BaseEntity, Kind, 1656 MultiExprArg(*this, Args, NumArgs), 0); 1657 if (BaseInit.isInvalid()) 1658 return true; 1659 1660 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1661 1662 // C++0x [class.base.init]p7: 1663 // The initialization of each base and member constitutes a 1664 // full-expression. 1665 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1666 if (BaseInit.isInvalid()) 1667 return true; 1668 1669 // If we are in a dependent context, template instantiation will 1670 // perform this type-checking again. Just save the arguments that we 1671 // received in a ParenListExpr. 1672 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1673 // of the information that we have about the base 1674 // initializer. However, deconstructing the ASTs is a dicey process, 1675 // and this approach is far more likely to get the corner cases right. 1676 if (CurContext->isDependentContext()) { 1677 ExprResult Init 1678 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1679 RParenLoc)); 1680 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1681 BaseSpec->isVirtual(), 1682 LParenLoc, 1683 Init.takeAs<Expr>(), 1684 RParenLoc, 1685 EllipsisLoc); 1686 } 1687 1688 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1689 BaseSpec->isVirtual(), 1690 LParenLoc, 1691 BaseInit.takeAs<Expr>(), 1692 RParenLoc, 1693 EllipsisLoc); 1694} 1695 1696/// ImplicitInitializerKind - How an implicit base or member initializer should 1697/// initialize its base or member. 1698enum ImplicitInitializerKind { 1699 IIK_Default, 1700 IIK_Copy, 1701 IIK_Move 1702}; 1703 1704static bool 1705BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1706 ImplicitInitializerKind ImplicitInitKind, 1707 CXXBaseSpecifier *BaseSpec, 1708 bool IsInheritedVirtualBase, 1709 CXXCtorInitializer *&CXXBaseInit) { 1710 InitializedEntity InitEntity 1711 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1712 IsInheritedVirtualBase); 1713 1714 ExprResult BaseInit; 1715 1716 switch (ImplicitInitKind) { 1717 case IIK_Default: { 1718 InitializationKind InitKind 1719 = InitializationKind::CreateDefault(Constructor->getLocation()); 1720 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1721 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1722 MultiExprArg(SemaRef, 0, 0)); 1723 break; 1724 } 1725 1726 case IIK_Copy: { 1727 ParmVarDecl *Param = Constructor->getParamDecl(0); 1728 QualType ParamType = Param->getType().getNonReferenceType(); 1729 1730 Expr *CopyCtorArg = 1731 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1732 Constructor->getLocation(), ParamType, 1733 VK_LValue, 0); 1734 1735 // Cast to the base class to avoid ambiguities. 1736 QualType ArgTy = 1737 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1738 ParamType.getQualifiers()); 1739 1740 CXXCastPath BasePath; 1741 BasePath.push_back(BaseSpec); 1742 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1743 CK_UncheckedDerivedToBase, 1744 VK_LValue, &BasePath); 1745 1746 InitializationKind InitKind 1747 = InitializationKind::CreateDirect(Constructor->getLocation(), 1748 SourceLocation(), SourceLocation()); 1749 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1750 &CopyCtorArg, 1); 1751 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1752 MultiExprArg(&CopyCtorArg, 1)); 1753 break; 1754 } 1755 1756 case IIK_Move: 1757 assert(false && "Unhandled initializer kind!"); 1758 } 1759 1760 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1761 if (BaseInit.isInvalid()) 1762 return true; 1763 1764 CXXBaseInit = 1765 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1766 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1767 SourceLocation()), 1768 BaseSpec->isVirtual(), 1769 SourceLocation(), 1770 BaseInit.takeAs<Expr>(), 1771 SourceLocation(), 1772 SourceLocation()); 1773 1774 return false; 1775} 1776 1777static bool 1778BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1779 ImplicitInitializerKind ImplicitInitKind, 1780 FieldDecl *Field, 1781 CXXCtorInitializer *&CXXMemberInit) { 1782 if (Field->isInvalidDecl()) 1783 return true; 1784 1785 SourceLocation Loc = Constructor->getLocation(); 1786 1787 if (ImplicitInitKind == IIK_Copy) { 1788 ParmVarDecl *Param = Constructor->getParamDecl(0); 1789 QualType ParamType = Param->getType().getNonReferenceType(); 1790 1791 Expr *MemberExprBase = 1792 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1793 Loc, ParamType, VK_LValue, 0); 1794 1795 // Build a reference to this field within the parameter. 1796 CXXScopeSpec SS; 1797 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1798 Sema::LookupMemberName); 1799 MemberLookup.addDecl(Field, AS_public); 1800 MemberLookup.resolveKind(); 1801 ExprResult CopyCtorArg 1802 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1803 ParamType, Loc, 1804 /*IsArrow=*/false, 1805 SS, 1806 /*FirstQualifierInScope=*/0, 1807 MemberLookup, 1808 /*TemplateArgs=*/0); 1809 if (CopyCtorArg.isInvalid()) 1810 return true; 1811 1812 // When the field we are copying is an array, create index variables for 1813 // each dimension of the array. We use these index variables to subscript 1814 // the source array, and other clients (e.g., CodeGen) will perform the 1815 // necessary iteration with these index variables. 1816 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1817 QualType BaseType = Field->getType(); 1818 QualType SizeType = SemaRef.Context.getSizeType(); 1819 while (const ConstantArrayType *Array 1820 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1821 // Create the iteration variable for this array index. 1822 IdentifierInfo *IterationVarName = 0; 1823 { 1824 llvm::SmallString<8> Str; 1825 llvm::raw_svector_ostream OS(Str); 1826 OS << "__i" << IndexVariables.size(); 1827 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1828 } 1829 VarDecl *IterationVar 1830 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1831 IterationVarName, SizeType, 1832 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1833 SC_None, SC_None); 1834 IndexVariables.push_back(IterationVar); 1835 1836 // Create a reference to the iteration variable. 1837 ExprResult IterationVarRef 1838 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1839 assert(!IterationVarRef.isInvalid() && 1840 "Reference to invented variable cannot fail!"); 1841 1842 // Subscript the array with this iteration variable. 1843 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1844 Loc, 1845 IterationVarRef.take(), 1846 Loc); 1847 if (CopyCtorArg.isInvalid()) 1848 return true; 1849 1850 BaseType = Array->getElementType(); 1851 } 1852 1853 // Construct the entity that we will be initializing. For an array, this 1854 // will be first element in the array, which may require several levels 1855 // of array-subscript entities. 1856 llvm::SmallVector<InitializedEntity, 4> Entities; 1857 Entities.reserve(1 + IndexVariables.size()); 1858 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1859 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1860 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1861 0, 1862 Entities.back())); 1863 1864 // Direct-initialize to use the copy constructor. 1865 InitializationKind InitKind = 1866 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1867 1868 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1869 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1870 &CopyCtorArgE, 1); 1871 1872 ExprResult MemberInit 1873 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1874 MultiExprArg(&CopyCtorArgE, 1)); 1875 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1876 if (MemberInit.isInvalid()) 1877 return true; 1878 1879 CXXMemberInit 1880 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1881 MemberInit.takeAs<Expr>(), Loc, 1882 IndexVariables.data(), 1883 IndexVariables.size()); 1884 return false; 1885 } 1886 1887 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1888 1889 QualType FieldBaseElementType = 1890 SemaRef.Context.getBaseElementType(Field->getType()); 1891 1892 if (FieldBaseElementType->isRecordType()) { 1893 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1894 InitializationKind InitKind = 1895 InitializationKind::CreateDefault(Loc); 1896 1897 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1898 ExprResult MemberInit = 1899 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1900 1901 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1902 if (MemberInit.isInvalid()) 1903 return true; 1904 1905 CXXMemberInit = 1906 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1907 Field, Loc, Loc, 1908 MemberInit.get(), 1909 Loc); 1910 return false; 1911 } 1912 1913 if (FieldBaseElementType->isReferenceType()) { 1914 SemaRef.Diag(Constructor->getLocation(), 1915 diag::err_uninitialized_member_in_ctor) 1916 << (int)Constructor->isImplicit() 1917 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1918 << 0 << Field->getDeclName(); 1919 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1920 return true; 1921 } 1922 1923 if (FieldBaseElementType.isConstQualified()) { 1924 SemaRef.Diag(Constructor->getLocation(), 1925 diag::err_uninitialized_member_in_ctor) 1926 << (int)Constructor->isImplicit() 1927 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1928 << 1 << Field->getDeclName(); 1929 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1930 return true; 1931 } 1932 1933 // Nothing to initialize. 1934 CXXMemberInit = 0; 1935 return false; 1936} 1937 1938namespace { 1939struct BaseAndFieldInfo { 1940 Sema &S; 1941 CXXConstructorDecl *Ctor; 1942 bool AnyErrorsInInits; 1943 ImplicitInitializerKind IIK; 1944 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1945 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1946 1947 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1948 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1949 // FIXME: Handle implicit move constructors. 1950 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1951 IIK = IIK_Copy; 1952 else 1953 IIK = IIK_Default; 1954 } 1955}; 1956} 1957 1958static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1959 FieldDecl *Top, FieldDecl *Field) { 1960 1961 // Overwhelmingly common case: we have a direct initializer for this field. 1962 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1963 Info.AllToInit.push_back(Init); 1964 return false; 1965 } 1966 1967 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1968 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1969 assert(FieldClassType && "anonymous struct/union without record type"); 1970 CXXRecordDecl *FieldClassDecl 1971 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1972 1973 // Even though union members never have non-trivial default 1974 // constructions in C++03, we still build member initializers for aggregate 1975 // record types which can be union members, and C++0x allows non-trivial 1976 // default constructors for union members, so we ensure that only one 1977 // member is initialized for these. 1978 if (FieldClassDecl->isUnion()) { 1979 // First check for an explicit initializer for one field. 1980 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1981 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1982 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1983 Info.AllToInit.push_back(Init); 1984 1985 // Once we've initialized a field of an anonymous union, the union 1986 // field in the class is also initialized, so exit immediately. 1987 return false; 1988 } else if ((*FA)->isAnonymousStructOrUnion()) { 1989 if (CollectFieldInitializer(Info, Top, *FA)) 1990 return true; 1991 } 1992 } 1993 1994 // Fallthrough and construct a default initializer for the union as 1995 // a whole, which can call its default constructor if such a thing exists 1996 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1997 // behavior going forward with C++0x, when anonymous unions there are 1998 // finalized, we should revisit this. 1999 } else { 2000 // For structs, we simply descend through to initialize all members where 2001 // necessary. 2002 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2003 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2004 if (CollectFieldInitializer(Info, Top, *FA)) 2005 return true; 2006 } 2007 } 2008 } 2009 2010 // Don't try to build an implicit initializer if there were semantic 2011 // errors in any of the initializers (and therefore we might be 2012 // missing some that the user actually wrote). 2013 if (Info.AnyErrorsInInits) 2014 return false; 2015 2016 CXXCtorInitializer *Init = 0; 2017 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2018 return true; 2019 2020 if (Init) 2021 Info.AllToInit.push_back(Init); 2022 2023 return false; 2024} 2025 2026bool 2027Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2028 CXXCtorInitializer **Initializers, 2029 unsigned NumInitializers, 2030 bool AnyErrors) { 2031 if (Constructor->getDeclContext()->isDependentContext()) { 2032 // Just store the initializers as written, they will be checked during 2033 // instantiation. 2034 if (NumInitializers > 0) { 2035 Constructor->setNumCtorInitializers(NumInitializers); 2036 CXXCtorInitializer **baseOrMemberInitializers = 2037 new (Context) CXXCtorInitializer*[NumInitializers]; 2038 memcpy(baseOrMemberInitializers, Initializers, 2039 NumInitializers * sizeof(CXXCtorInitializer*)); 2040 Constructor->setCtorInitializers(baseOrMemberInitializers); 2041 } 2042 2043 return false; 2044 } 2045 2046 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2047 2048 // We need to build the initializer AST according to order of construction 2049 // and not what user specified in the Initializers list. 2050 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2051 if (!ClassDecl) 2052 return true; 2053 2054 bool HadError = false; 2055 2056 for (unsigned i = 0; i < NumInitializers; i++) { 2057 CXXCtorInitializer *Member = Initializers[i]; 2058 2059 if (Member->isBaseInitializer()) 2060 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2061 else 2062 Info.AllBaseFields[Member->getAnyMember()] = Member; 2063 } 2064 2065 // Keep track of the direct virtual bases. 2066 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2067 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2068 E = ClassDecl->bases_end(); I != E; ++I) { 2069 if (I->isVirtual()) 2070 DirectVBases.insert(I); 2071 } 2072 2073 // Push virtual bases before others. 2074 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2075 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2076 2077 if (CXXCtorInitializer *Value 2078 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2079 Info.AllToInit.push_back(Value); 2080 } else if (!AnyErrors) { 2081 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2082 CXXCtorInitializer *CXXBaseInit; 2083 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2084 VBase, IsInheritedVirtualBase, 2085 CXXBaseInit)) { 2086 HadError = true; 2087 continue; 2088 } 2089 2090 Info.AllToInit.push_back(CXXBaseInit); 2091 } 2092 } 2093 2094 // Non-virtual bases. 2095 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2096 E = ClassDecl->bases_end(); Base != E; ++Base) { 2097 // Virtuals are in the virtual base list and already constructed. 2098 if (Base->isVirtual()) 2099 continue; 2100 2101 if (CXXCtorInitializer *Value 2102 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2103 Info.AllToInit.push_back(Value); 2104 } else if (!AnyErrors) { 2105 CXXCtorInitializer *CXXBaseInit; 2106 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2107 Base, /*IsInheritedVirtualBase=*/false, 2108 CXXBaseInit)) { 2109 HadError = true; 2110 continue; 2111 } 2112 2113 Info.AllToInit.push_back(CXXBaseInit); 2114 } 2115 } 2116 2117 // Fields. 2118 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2119 E = ClassDecl->field_end(); Field != E; ++Field) { 2120 if ((*Field)->getType()->isIncompleteArrayType()) { 2121 assert(ClassDecl->hasFlexibleArrayMember() && 2122 "Incomplete array type is not valid"); 2123 continue; 2124 } 2125 if (CollectFieldInitializer(Info, *Field, *Field)) 2126 HadError = true; 2127 } 2128 2129 NumInitializers = Info.AllToInit.size(); 2130 if (NumInitializers > 0) { 2131 Constructor->setNumCtorInitializers(NumInitializers); 2132 CXXCtorInitializer **baseOrMemberInitializers = 2133 new (Context) CXXCtorInitializer*[NumInitializers]; 2134 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2135 NumInitializers * sizeof(CXXCtorInitializer*)); 2136 Constructor->setCtorInitializers(baseOrMemberInitializers); 2137 2138 // Constructors implicitly reference the base and member 2139 // destructors. 2140 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2141 Constructor->getParent()); 2142 } 2143 2144 return HadError; 2145} 2146 2147static void *GetKeyForTopLevelField(FieldDecl *Field) { 2148 // For anonymous unions, use the class declaration as the key. 2149 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2150 if (RT->getDecl()->isAnonymousStructOrUnion()) 2151 return static_cast<void *>(RT->getDecl()); 2152 } 2153 return static_cast<void *>(Field); 2154} 2155 2156static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2157 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2158} 2159 2160static void *GetKeyForMember(ASTContext &Context, 2161 CXXCtorInitializer *Member) { 2162 if (!Member->isAnyMemberInitializer()) 2163 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2164 2165 // For fields injected into the class via declaration of an anonymous union, 2166 // use its anonymous union class declaration as the unique key. 2167 FieldDecl *Field = Member->getAnyMember(); 2168 2169 // If the field is a member of an anonymous struct or union, our key 2170 // is the anonymous record decl that's a direct child of the class. 2171 RecordDecl *RD = Field->getParent(); 2172 if (RD->isAnonymousStructOrUnion()) { 2173 while (true) { 2174 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2175 if (Parent->isAnonymousStructOrUnion()) 2176 RD = Parent; 2177 else 2178 break; 2179 } 2180 2181 return static_cast<void *>(RD); 2182 } 2183 2184 return static_cast<void *>(Field); 2185} 2186 2187static void 2188DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2189 const CXXConstructorDecl *Constructor, 2190 CXXCtorInitializer **Inits, 2191 unsigned NumInits) { 2192 if (Constructor->getDeclContext()->isDependentContext()) 2193 return; 2194 2195 // Don't check initializers order unless the warning is enabled at the 2196 // location of at least one initializer. 2197 bool ShouldCheckOrder = false; 2198 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2199 CXXCtorInitializer *Init = Inits[InitIndex]; 2200 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2201 Init->getSourceLocation()) 2202 != Diagnostic::Ignored) { 2203 ShouldCheckOrder = true; 2204 break; 2205 } 2206 } 2207 if (!ShouldCheckOrder) 2208 return; 2209 2210 // Build the list of bases and members in the order that they'll 2211 // actually be initialized. The explicit initializers should be in 2212 // this same order but may be missing things. 2213 llvm::SmallVector<const void*, 32> IdealInitKeys; 2214 2215 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2216 2217 // 1. Virtual bases. 2218 for (CXXRecordDecl::base_class_const_iterator VBase = 2219 ClassDecl->vbases_begin(), 2220 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2221 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2222 2223 // 2. Non-virtual bases. 2224 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2225 E = ClassDecl->bases_end(); Base != E; ++Base) { 2226 if (Base->isVirtual()) 2227 continue; 2228 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2229 } 2230 2231 // 3. Direct fields. 2232 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2233 E = ClassDecl->field_end(); Field != E; ++Field) 2234 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2235 2236 unsigned NumIdealInits = IdealInitKeys.size(); 2237 unsigned IdealIndex = 0; 2238 2239 CXXCtorInitializer *PrevInit = 0; 2240 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2241 CXXCtorInitializer *Init = Inits[InitIndex]; 2242 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2243 2244 // Scan forward to try to find this initializer in the idealized 2245 // initializers list. 2246 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2247 if (InitKey == IdealInitKeys[IdealIndex]) 2248 break; 2249 2250 // If we didn't find this initializer, it must be because we 2251 // scanned past it on a previous iteration. That can only 2252 // happen if we're out of order; emit a warning. 2253 if (IdealIndex == NumIdealInits && PrevInit) { 2254 Sema::SemaDiagnosticBuilder D = 2255 SemaRef.Diag(PrevInit->getSourceLocation(), 2256 diag::warn_initializer_out_of_order); 2257 2258 if (PrevInit->isAnyMemberInitializer()) 2259 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2260 else 2261 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2262 2263 if (Init->isAnyMemberInitializer()) 2264 D << 0 << Init->getAnyMember()->getDeclName(); 2265 else 2266 D << 1 << Init->getBaseClassInfo()->getType(); 2267 2268 // Move back to the initializer's location in the ideal list. 2269 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2270 if (InitKey == IdealInitKeys[IdealIndex]) 2271 break; 2272 2273 assert(IdealIndex != NumIdealInits && 2274 "initializer not found in initializer list"); 2275 } 2276 2277 PrevInit = Init; 2278 } 2279} 2280 2281namespace { 2282bool CheckRedundantInit(Sema &S, 2283 CXXCtorInitializer *Init, 2284 CXXCtorInitializer *&PrevInit) { 2285 if (!PrevInit) { 2286 PrevInit = Init; 2287 return false; 2288 } 2289 2290 if (FieldDecl *Field = Init->getMember()) 2291 S.Diag(Init->getSourceLocation(), 2292 diag::err_multiple_mem_initialization) 2293 << Field->getDeclName() 2294 << Init->getSourceRange(); 2295 else { 2296 const Type *BaseClass = Init->getBaseClass(); 2297 assert(BaseClass && "neither field nor base"); 2298 S.Diag(Init->getSourceLocation(), 2299 diag::err_multiple_base_initialization) 2300 << QualType(BaseClass, 0) 2301 << Init->getSourceRange(); 2302 } 2303 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2304 << 0 << PrevInit->getSourceRange(); 2305 2306 return true; 2307} 2308 2309typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2310typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2311 2312bool CheckRedundantUnionInit(Sema &S, 2313 CXXCtorInitializer *Init, 2314 RedundantUnionMap &Unions) { 2315 FieldDecl *Field = Init->getAnyMember(); 2316 RecordDecl *Parent = Field->getParent(); 2317 if (!Parent->isAnonymousStructOrUnion()) 2318 return false; 2319 2320 NamedDecl *Child = Field; 2321 do { 2322 if (Parent->isUnion()) { 2323 UnionEntry &En = Unions[Parent]; 2324 if (En.first && En.first != Child) { 2325 S.Diag(Init->getSourceLocation(), 2326 diag::err_multiple_mem_union_initialization) 2327 << Field->getDeclName() 2328 << Init->getSourceRange(); 2329 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2330 << 0 << En.second->getSourceRange(); 2331 return true; 2332 } else if (!En.first) { 2333 En.first = Child; 2334 En.second = Init; 2335 } 2336 } 2337 2338 Child = Parent; 2339 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2340 } while (Parent->isAnonymousStructOrUnion()); 2341 2342 return false; 2343} 2344} 2345 2346/// ActOnMemInitializers - Handle the member initializers for a constructor. 2347void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2348 SourceLocation ColonLoc, 2349 MemInitTy **meminits, unsigned NumMemInits, 2350 bool AnyErrors) { 2351 if (!ConstructorDecl) 2352 return; 2353 2354 AdjustDeclIfTemplate(ConstructorDecl); 2355 2356 CXXConstructorDecl *Constructor 2357 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2358 2359 if (!Constructor) { 2360 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2361 return; 2362 } 2363 2364 CXXCtorInitializer **MemInits = 2365 reinterpret_cast<CXXCtorInitializer **>(meminits); 2366 2367 // Mapping for the duplicate initializers check. 2368 // For member initializers, this is keyed with a FieldDecl*. 2369 // For base initializers, this is keyed with a Type*. 2370 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2371 2372 // Mapping for the inconsistent anonymous-union initializers check. 2373 RedundantUnionMap MemberUnions; 2374 2375 bool HadError = false; 2376 for (unsigned i = 0; i < NumMemInits; i++) { 2377 CXXCtorInitializer *Init = MemInits[i]; 2378 2379 // Set the source order index. 2380 Init->setSourceOrder(i); 2381 2382 if (Init->isAnyMemberInitializer()) { 2383 FieldDecl *Field = Init->getAnyMember(); 2384 if (CheckRedundantInit(*this, Init, Members[Field]) || 2385 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2386 HadError = true; 2387 } else if (Init->isBaseInitializer()) { 2388 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2389 if (CheckRedundantInit(*this, Init, Members[Key])) 2390 HadError = true; 2391 } else { 2392 assert(Init->isDelegatingInitializer()); 2393 // This must be the only initializer 2394 if (i != 0 || NumMemInits > 1) { 2395 Diag(MemInits[0]->getSourceLocation(), 2396 diag::err_delegating_initializer_alone) 2397 << MemInits[0]->getSourceRange(); 2398 HadError = true; 2399 } 2400 } 2401 } 2402 2403 if (HadError) 2404 return; 2405 2406 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2407 2408 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2409} 2410 2411void 2412Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2413 CXXRecordDecl *ClassDecl) { 2414 // Ignore dependent contexts. 2415 if (ClassDecl->isDependentContext()) 2416 return; 2417 2418 // FIXME: all the access-control diagnostics are positioned on the 2419 // field/base declaration. That's probably good; that said, the 2420 // user might reasonably want to know why the destructor is being 2421 // emitted, and we currently don't say. 2422 2423 // Non-static data members. 2424 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2425 E = ClassDecl->field_end(); I != E; ++I) { 2426 FieldDecl *Field = *I; 2427 if (Field->isInvalidDecl()) 2428 continue; 2429 QualType FieldType = Context.getBaseElementType(Field->getType()); 2430 2431 const RecordType* RT = FieldType->getAs<RecordType>(); 2432 if (!RT) 2433 continue; 2434 2435 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2436 if (FieldClassDecl->hasTrivialDestructor()) 2437 continue; 2438 2439 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2440 CheckDestructorAccess(Field->getLocation(), Dtor, 2441 PDiag(diag::err_access_dtor_field) 2442 << Field->getDeclName() 2443 << FieldType); 2444 2445 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2446 } 2447 2448 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2449 2450 // Bases. 2451 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2452 E = ClassDecl->bases_end(); Base != E; ++Base) { 2453 // Bases are always records in a well-formed non-dependent class. 2454 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2455 2456 // Remember direct virtual bases. 2457 if (Base->isVirtual()) 2458 DirectVirtualBases.insert(RT); 2459 2460 // Ignore trivial destructors. 2461 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2462 if (BaseClassDecl->hasTrivialDestructor()) 2463 continue; 2464 2465 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2466 2467 // FIXME: caret should be on the start of the class name 2468 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2469 PDiag(diag::err_access_dtor_base) 2470 << Base->getType() 2471 << Base->getSourceRange()); 2472 2473 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2474 } 2475 2476 // Virtual bases. 2477 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2478 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2479 2480 // Bases are always records in a well-formed non-dependent class. 2481 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2482 2483 // Ignore direct virtual bases. 2484 if (DirectVirtualBases.count(RT)) 2485 continue; 2486 2487 // Ignore trivial destructors. 2488 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2489 if (BaseClassDecl->hasTrivialDestructor()) 2490 continue; 2491 2492 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2493 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2494 PDiag(diag::err_access_dtor_vbase) 2495 << VBase->getType()); 2496 2497 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2498 } 2499} 2500 2501void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2502 if (!CDtorDecl) 2503 return; 2504 2505 if (CXXConstructorDecl *Constructor 2506 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2507 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2508} 2509 2510bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2511 unsigned DiagID, AbstractDiagSelID SelID) { 2512 if (SelID == -1) 2513 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2514 else 2515 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2516} 2517 2518bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2519 const PartialDiagnostic &PD) { 2520 if (!getLangOptions().CPlusPlus) 2521 return false; 2522 2523 if (const ArrayType *AT = Context.getAsArrayType(T)) 2524 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2525 2526 if (const PointerType *PT = T->getAs<PointerType>()) { 2527 // Find the innermost pointer type. 2528 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2529 PT = T; 2530 2531 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2532 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2533 } 2534 2535 const RecordType *RT = T->getAs<RecordType>(); 2536 if (!RT) 2537 return false; 2538 2539 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2540 2541 // We can't answer whether something is abstract until it has a 2542 // definition. If it's currently being defined, we'll walk back 2543 // over all the declarations when we have a full definition. 2544 const CXXRecordDecl *Def = RD->getDefinition(); 2545 if (!Def || Def->isBeingDefined()) 2546 return false; 2547 2548 if (!RD->isAbstract()) 2549 return false; 2550 2551 Diag(Loc, PD) << RD->getDeclName(); 2552 DiagnoseAbstractType(RD); 2553 2554 return true; 2555} 2556 2557void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2558 // Check if we've already emitted the list of pure virtual functions 2559 // for this class. 2560 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2561 return; 2562 2563 CXXFinalOverriderMap FinalOverriders; 2564 RD->getFinalOverriders(FinalOverriders); 2565 2566 // Keep a set of seen pure methods so we won't diagnose the same method 2567 // more than once. 2568 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2569 2570 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2571 MEnd = FinalOverriders.end(); 2572 M != MEnd; 2573 ++M) { 2574 for (OverridingMethods::iterator SO = M->second.begin(), 2575 SOEnd = M->second.end(); 2576 SO != SOEnd; ++SO) { 2577 // C++ [class.abstract]p4: 2578 // A class is abstract if it contains or inherits at least one 2579 // pure virtual function for which the final overrider is pure 2580 // virtual. 2581 2582 // 2583 if (SO->second.size() != 1) 2584 continue; 2585 2586 if (!SO->second.front().Method->isPure()) 2587 continue; 2588 2589 if (!SeenPureMethods.insert(SO->second.front().Method)) 2590 continue; 2591 2592 Diag(SO->second.front().Method->getLocation(), 2593 diag::note_pure_virtual_function) 2594 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2595 } 2596 } 2597 2598 if (!PureVirtualClassDiagSet) 2599 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2600 PureVirtualClassDiagSet->insert(RD); 2601} 2602 2603namespace { 2604struct AbstractUsageInfo { 2605 Sema &S; 2606 CXXRecordDecl *Record; 2607 CanQualType AbstractType; 2608 bool Invalid; 2609 2610 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2611 : S(S), Record(Record), 2612 AbstractType(S.Context.getCanonicalType( 2613 S.Context.getTypeDeclType(Record))), 2614 Invalid(false) {} 2615 2616 void DiagnoseAbstractType() { 2617 if (Invalid) return; 2618 S.DiagnoseAbstractType(Record); 2619 Invalid = true; 2620 } 2621 2622 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2623}; 2624 2625struct CheckAbstractUsage { 2626 AbstractUsageInfo &Info; 2627 const NamedDecl *Ctx; 2628 2629 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2630 : Info(Info), Ctx(Ctx) {} 2631 2632 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2633 switch (TL.getTypeLocClass()) { 2634#define ABSTRACT_TYPELOC(CLASS, PARENT) 2635#define TYPELOC(CLASS, PARENT) \ 2636 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2637#include "clang/AST/TypeLocNodes.def" 2638 } 2639 } 2640 2641 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2642 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2643 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2644 if (!TL.getArg(I)) 2645 continue; 2646 2647 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2648 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2649 } 2650 } 2651 2652 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2653 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2654 } 2655 2656 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2657 // Visit the type parameters from a permissive context. 2658 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2659 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2660 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2661 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2662 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2663 // TODO: other template argument types? 2664 } 2665 } 2666 2667 // Visit pointee types from a permissive context. 2668#define CheckPolymorphic(Type) \ 2669 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2670 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2671 } 2672 CheckPolymorphic(PointerTypeLoc) 2673 CheckPolymorphic(ReferenceTypeLoc) 2674 CheckPolymorphic(MemberPointerTypeLoc) 2675 CheckPolymorphic(BlockPointerTypeLoc) 2676 2677 /// Handle all the types we haven't given a more specific 2678 /// implementation for above. 2679 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2680 // Every other kind of type that we haven't called out already 2681 // that has an inner type is either (1) sugar or (2) contains that 2682 // inner type in some way as a subobject. 2683 if (TypeLoc Next = TL.getNextTypeLoc()) 2684 return Visit(Next, Sel); 2685 2686 // If there's no inner type and we're in a permissive context, 2687 // don't diagnose. 2688 if (Sel == Sema::AbstractNone) return; 2689 2690 // Check whether the type matches the abstract type. 2691 QualType T = TL.getType(); 2692 if (T->isArrayType()) { 2693 Sel = Sema::AbstractArrayType; 2694 T = Info.S.Context.getBaseElementType(T); 2695 } 2696 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2697 if (CT != Info.AbstractType) return; 2698 2699 // It matched; do some magic. 2700 if (Sel == Sema::AbstractArrayType) { 2701 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2702 << T << TL.getSourceRange(); 2703 } else { 2704 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2705 << Sel << T << TL.getSourceRange(); 2706 } 2707 Info.DiagnoseAbstractType(); 2708 } 2709}; 2710 2711void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2712 Sema::AbstractDiagSelID Sel) { 2713 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2714} 2715 2716} 2717 2718/// Check for invalid uses of an abstract type in a method declaration. 2719static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2720 CXXMethodDecl *MD) { 2721 // No need to do the check on definitions, which require that 2722 // the return/param types be complete. 2723 if (MD->isThisDeclarationADefinition()) 2724 return; 2725 2726 // For safety's sake, just ignore it if we don't have type source 2727 // information. This should never happen for non-implicit methods, 2728 // but... 2729 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2730 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2731} 2732 2733/// Check for invalid uses of an abstract type within a class definition. 2734static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2735 CXXRecordDecl *RD) { 2736 for (CXXRecordDecl::decl_iterator 2737 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2738 Decl *D = *I; 2739 if (D->isImplicit()) continue; 2740 2741 // Methods and method templates. 2742 if (isa<CXXMethodDecl>(D)) { 2743 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2744 } else if (isa<FunctionTemplateDecl>(D)) { 2745 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2746 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2747 2748 // Fields and static variables. 2749 } else if (isa<FieldDecl>(D)) { 2750 FieldDecl *FD = cast<FieldDecl>(D); 2751 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2752 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2753 } else if (isa<VarDecl>(D)) { 2754 VarDecl *VD = cast<VarDecl>(D); 2755 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2756 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2757 2758 // Nested classes and class templates. 2759 } else if (isa<CXXRecordDecl>(D)) { 2760 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2761 } else if (isa<ClassTemplateDecl>(D)) { 2762 CheckAbstractClassUsage(Info, 2763 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2764 } 2765 } 2766} 2767 2768/// \brief Perform semantic checks on a class definition that has been 2769/// completing, introducing implicitly-declared members, checking for 2770/// abstract types, etc. 2771void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2772 if (!Record) 2773 return; 2774 2775 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2776 AbstractUsageInfo Info(*this, Record); 2777 CheckAbstractClassUsage(Info, Record); 2778 } 2779 2780 // If this is not an aggregate type and has no user-declared constructor, 2781 // complain about any non-static data members of reference or const scalar 2782 // type, since they will never get initializers. 2783 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2784 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2785 bool Complained = false; 2786 for (RecordDecl::field_iterator F = Record->field_begin(), 2787 FEnd = Record->field_end(); 2788 F != FEnd; ++F) { 2789 if (F->getType()->isReferenceType() || 2790 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2791 if (!Complained) { 2792 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2793 << Record->getTagKind() << Record; 2794 Complained = true; 2795 } 2796 2797 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2798 << F->getType()->isReferenceType() 2799 << F->getDeclName(); 2800 } 2801 } 2802 } 2803 2804 if (Record->isDynamicClass() && !Record->isDependentType()) 2805 DynamicClasses.push_back(Record); 2806 2807 if (Record->getIdentifier()) { 2808 // C++ [class.mem]p13: 2809 // If T is the name of a class, then each of the following shall have a 2810 // name different from T: 2811 // - every member of every anonymous union that is a member of class T. 2812 // 2813 // C++ [class.mem]p14: 2814 // In addition, if class T has a user-declared constructor (12.1), every 2815 // non-static data member of class T shall have a name different from T. 2816 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2817 R.first != R.second; ++R.first) { 2818 NamedDecl *D = *R.first; 2819 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2820 isa<IndirectFieldDecl>(D)) { 2821 Diag(D->getLocation(), diag::err_member_name_of_class) 2822 << D->getDeclName(); 2823 break; 2824 } 2825 } 2826 } 2827 2828 // Warn if the class has virtual methods but non-virtual public destructor. 2829 if (Record->isPolymorphic() && !Record->isDependentType()) { 2830 CXXDestructorDecl *dtor = Record->getDestructor(); 2831 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2832 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2833 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2834 } 2835 2836 // See if a method overloads virtual methods in a base 2837 /// class without overriding any. 2838 if (!Record->isDependentType()) { 2839 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2840 MEnd = Record->method_end(); 2841 M != MEnd; ++M) { 2842 DiagnoseHiddenVirtualMethods(Record, *M); 2843 } 2844 } 2845 2846 // Declare inherited constructors. We do this eagerly here because: 2847 // - The standard requires an eager diagnostic for conflicting inherited 2848 // constructors from different classes. 2849 // - The lazy declaration of the other implicit constructors is so as to not 2850 // waste space and performance on classes that are not meant to be 2851 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2852 // have inherited constructors. 2853 DeclareInheritedConstructors(Record); 2854} 2855 2856/// \brief Data used with FindHiddenVirtualMethod 2857struct FindHiddenVirtualMethodData { 2858 Sema *S; 2859 CXXMethodDecl *Method; 2860 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2861 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2862}; 2863 2864/// \brief Member lookup function that determines whether a given C++ 2865/// method overloads virtual methods in a base class without overriding any, 2866/// to be used with CXXRecordDecl::lookupInBases(). 2867static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2868 CXXBasePath &Path, 2869 void *UserData) { 2870 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2871 2872 FindHiddenVirtualMethodData &Data 2873 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2874 2875 DeclarationName Name = Data.Method->getDeclName(); 2876 assert(Name.getNameKind() == DeclarationName::Identifier); 2877 2878 bool foundSameNameMethod = false; 2879 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2880 for (Path.Decls = BaseRecord->lookup(Name); 2881 Path.Decls.first != Path.Decls.second; 2882 ++Path.Decls.first) { 2883 NamedDecl *D = *Path.Decls.first; 2884 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2885 MD = MD->getCanonicalDecl(); 2886 foundSameNameMethod = true; 2887 // Interested only in hidden virtual methods. 2888 if (!MD->isVirtual()) 2889 continue; 2890 // If the method we are checking overrides a method from its base 2891 // don't warn about the other overloaded methods. 2892 if (!Data.S->IsOverload(Data.Method, MD, false)) 2893 return true; 2894 // Collect the overload only if its hidden. 2895 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2896 overloadedMethods.push_back(MD); 2897 } 2898 } 2899 2900 if (foundSameNameMethod) 2901 Data.OverloadedMethods.append(overloadedMethods.begin(), 2902 overloadedMethods.end()); 2903 return foundSameNameMethod; 2904} 2905 2906/// \brief See if a method overloads virtual methods in a base class without 2907/// overriding any. 2908void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2909 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2910 MD->getLocation()) == Diagnostic::Ignored) 2911 return; 2912 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2913 return; 2914 2915 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2916 /*bool RecordPaths=*/false, 2917 /*bool DetectVirtual=*/false); 2918 FindHiddenVirtualMethodData Data; 2919 Data.Method = MD; 2920 Data.S = this; 2921 2922 // Keep the base methods that were overriden or introduced in the subclass 2923 // by 'using' in a set. A base method not in this set is hidden. 2924 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2925 res.first != res.second; ++res.first) { 2926 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2927 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2928 E = MD->end_overridden_methods(); 2929 I != E; ++I) 2930 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2931 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2932 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2933 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2934 } 2935 2936 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2937 !Data.OverloadedMethods.empty()) { 2938 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2939 << MD << (Data.OverloadedMethods.size() > 1); 2940 2941 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2942 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2943 Diag(overloadedMD->getLocation(), 2944 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2945 } 2946 } 2947} 2948 2949void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2950 Decl *TagDecl, 2951 SourceLocation LBrac, 2952 SourceLocation RBrac, 2953 AttributeList *AttrList) { 2954 if (!TagDecl) 2955 return; 2956 2957 AdjustDeclIfTemplate(TagDecl); 2958 2959 ActOnFields(S, RLoc, TagDecl, 2960 // strict aliasing violation! 2961 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2962 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2963 2964 CheckCompletedCXXClass( 2965 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2966} 2967 2968namespace { 2969 /// \brief Helper class that collects exception specifications for 2970 /// implicitly-declared special member functions. 2971 class ImplicitExceptionSpecification { 2972 ASTContext &Context; 2973 bool AllowsAllExceptions; 2974 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2975 llvm::SmallVector<QualType, 4> Exceptions; 2976 2977 public: 2978 explicit ImplicitExceptionSpecification(ASTContext &Context) 2979 : Context(Context), AllowsAllExceptions(false) { } 2980 2981 /// \brief Whether the special member function should have any 2982 /// exception specification at all. 2983 bool hasExceptionSpecification() const { 2984 return !AllowsAllExceptions; 2985 } 2986 2987 /// \brief Whether the special member function should have a 2988 /// throw(...) exception specification (a Microsoft extension). 2989 bool hasAnyExceptionSpecification() const { 2990 return false; 2991 } 2992 2993 /// \brief The number of exceptions in the exception specification. 2994 unsigned size() const { return Exceptions.size(); } 2995 2996 /// \brief The set of exceptions in the exception specification. 2997 const QualType *data() const { return Exceptions.data(); } 2998 2999 /// \brief Note that 3000 void CalledDecl(CXXMethodDecl *Method) { 3001 // If we already know that we allow all exceptions, do nothing. 3002 if (AllowsAllExceptions || !Method) 3003 return; 3004 3005 const FunctionProtoType *Proto 3006 = Method->getType()->getAs<FunctionProtoType>(); 3007 3008 // If this function can throw any exceptions, make a note of that. 3009 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 3010 AllowsAllExceptions = true; 3011 ExceptionsSeen.clear(); 3012 Exceptions.clear(); 3013 return; 3014 } 3015 3016 // Record the exceptions in this function's exception specification. 3017 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3018 EEnd = Proto->exception_end(); 3019 E != EEnd; ++E) 3020 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3021 Exceptions.push_back(*E); 3022 } 3023 }; 3024} 3025 3026 3027/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3028/// special functions, such as the default constructor, copy 3029/// constructor, or destructor, to the given C++ class (C++ 3030/// [special]p1). This routine can only be executed just before the 3031/// definition of the class is complete. 3032void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3033 if (!ClassDecl->hasUserDeclaredConstructor()) 3034 ++ASTContext::NumImplicitDefaultConstructors; 3035 3036 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3037 ++ASTContext::NumImplicitCopyConstructors; 3038 3039 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3040 ++ASTContext::NumImplicitCopyAssignmentOperators; 3041 3042 // If we have a dynamic class, then the copy assignment operator may be 3043 // virtual, so we have to declare it immediately. This ensures that, e.g., 3044 // it shows up in the right place in the vtable and that we diagnose 3045 // problems with the implicit exception specification. 3046 if (ClassDecl->isDynamicClass()) 3047 DeclareImplicitCopyAssignment(ClassDecl); 3048 } 3049 3050 if (!ClassDecl->hasUserDeclaredDestructor()) { 3051 ++ASTContext::NumImplicitDestructors; 3052 3053 // If we have a dynamic class, then the destructor may be virtual, so we 3054 // have to declare the destructor immediately. This ensures that, e.g., it 3055 // shows up in the right place in the vtable and that we diagnose problems 3056 // with the implicit exception specification. 3057 if (ClassDecl->isDynamicClass()) 3058 DeclareImplicitDestructor(ClassDecl); 3059 } 3060} 3061 3062void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3063 if (!D) 3064 return; 3065 3066 TemplateParameterList *Params = 0; 3067 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3068 Params = Template->getTemplateParameters(); 3069 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3070 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3071 Params = PartialSpec->getTemplateParameters(); 3072 else 3073 return; 3074 3075 for (TemplateParameterList::iterator Param = Params->begin(), 3076 ParamEnd = Params->end(); 3077 Param != ParamEnd; ++Param) { 3078 NamedDecl *Named = cast<NamedDecl>(*Param); 3079 if (Named->getDeclName()) { 3080 S->AddDecl(Named); 3081 IdResolver.AddDecl(Named); 3082 } 3083 } 3084} 3085 3086void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3087 if (!RecordD) return; 3088 AdjustDeclIfTemplate(RecordD); 3089 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3090 PushDeclContext(S, Record); 3091} 3092 3093void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3094 if (!RecordD) return; 3095 PopDeclContext(); 3096} 3097 3098/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3099/// parsing a top-level (non-nested) C++ class, and we are now 3100/// parsing those parts of the given Method declaration that could 3101/// not be parsed earlier (C++ [class.mem]p2), such as default 3102/// arguments. This action should enter the scope of the given 3103/// Method declaration as if we had just parsed the qualified method 3104/// name. However, it should not bring the parameters into scope; 3105/// that will be performed by ActOnDelayedCXXMethodParameter. 3106void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3107} 3108 3109/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3110/// C++ method declaration. We're (re-)introducing the given 3111/// function parameter into scope for use in parsing later parts of 3112/// the method declaration. For example, we could see an 3113/// ActOnParamDefaultArgument event for this parameter. 3114void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3115 if (!ParamD) 3116 return; 3117 3118 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3119 3120 // If this parameter has an unparsed default argument, clear it out 3121 // to make way for the parsed default argument. 3122 if (Param->hasUnparsedDefaultArg()) 3123 Param->setDefaultArg(0); 3124 3125 S->AddDecl(Param); 3126 if (Param->getDeclName()) 3127 IdResolver.AddDecl(Param); 3128} 3129 3130/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3131/// processing the delayed method declaration for Method. The method 3132/// declaration is now considered finished. There may be a separate 3133/// ActOnStartOfFunctionDef action later (not necessarily 3134/// immediately!) for this method, if it was also defined inside the 3135/// class body. 3136void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3137 if (!MethodD) 3138 return; 3139 3140 AdjustDeclIfTemplate(MethodD); 3141 3142 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3143 3144 // Now that we have our default arguments, check the constructor 3145 // again. It could produce additional diagnostics or affect whether 3146 // the class has implicitly-declared destructors, among other 3147 // things. 3148 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3149 CheckConstructor(Constructor); 3150 3151 // Check the default arguments, which we may have added. 3152 if (!Method->isInvalidDecl()) 3153 CheckCXXDefaultArguments(Method); 3154} 3155 3156/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3157/// the well-formedness of the constructor declarator @p D with type @p 3158/// R. If there are any errors in the declarator, this routine will 3159/// emit diagnostics and set the invalid bit to true. In any case, the type 3160/// will be updated to reflect a well-formed type for the constructor and 3161/// returned. 3162QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3163 StorageClass &SC) { 3164 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3165 3166 // C++ [class.ctor]p3: 3167 // A constructor shall not be virtual (10.3) or static (9.4). A 3168 // constructor can be invoked for a const, volatile or const 3169 // volatile object. A constructor shall not be declared const, 3170 // volatile, or const volatile (9.3.2). 3171 if (isVirtual) { 3172 if (!D.isInvalidType()) 3173 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3174 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3175 << SourceRange(D.getIdentifierLoc()); 3176 D.setInvalidType(); 3177 } 3178 if (SC == SC_Static) { 3179 if (!D.isInvalidType()) 3180 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3181 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3182 << SourceRange(D.getIdentifierLoc()); 3183 D.setInvalidType(); 3184 SC = SC_None; 3185 } 3186 3187 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3188 if (FTI.TypeQuals != 0) { 3189 if (FTI.TypeQuals & Qualifiers::Const) 3190 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3191 << "const" << SourceRange(D.getIdentifierLoc()); 3192 if (FTI.TypeQuals & Qualifiers::Volatile) 3193 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3194 << "volatile" << SourceRange(D.getIdentifierLoc()); 3195 if (FTI.TypeQuals & Qualifiers::Restrict) 3196 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3197 << "restrict" << SourceRange(D.getIdentifierLoc()); 3198 D.setInvalidType(); 3199 } 3200 3201 // C++0x [class.ctor]p4: 3202 // A constructor shall not be declared with a ref-qualifier. 3203 if (FTI.hasRefQualifier()) { 3204 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3205 << FTI.RefQualifierIsLValueRef 3206 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3207 D.setInvalidType(); 3208 } 3209 3210 // Rebuild the function type "R" without any type qualifiers (in 3211 // case any of the errors above fired) and with "void" as the 3212 // return type, since constructors don't have return types. 3213 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3214 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3215 return R; 3216 3217 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3218 EPI.TypeQuals = 0; 3219 EPI.RefQualifier = RQ_None; 3220 3221 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3222 Proto->getNumArgs(), EPI); 3223} 3224 3225/// CheckConstructor - Checks a fully-formed constructor for 3226/// well-formedness, issuing any diagnostics required. Returns true if 3227/// the constructor declarator is invalid. 3228void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3229 CXXRecordDecl *ClassDecl 3230 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3231 if (!ClassDecl) 3232 return Constructor->setInvalidDecl(); 3233 3234 // C++ [class.copy]p3: 3235 // A declaration of a constructor for a class X is ill-formed if 3236 // its first parameter is of type (optionally cv-qualified) X and 3237 // either there are no other parameters or else all other 3238 // parameters have default arguments. 3239 if (!Constructor->isInvalidDecl() && 3240 ((Constructor->getNumParams() == 1) || 3241 (Constructor->getNumParams() > 1 && 3242 Constructor->getParamDecl(1)->hasDefaultArg())) && 3243 Constructor->getTemplateSpecializationKind() 3244 != TSK_ImplicitInstantiation) { 3245 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3246 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3247 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3248 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3249 const char *ConstRef 3250 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3251 : " const &"; 3252 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3253 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3254 3255 // FIXME: Rather that making the constructor invalid, we should endeavor 3256 // to fix the type. 3257 Constructor->setInvalidDecl(); 3258 } 3259 } 3260} 3261 3262/// CheckDestructor - Checks a fully-formed destructor definition for 3263/// well-formedness, issuing any diagnostics required. Returns true 3264/// on error. 3265bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3266 CXXRecordDecl *RD = Destructor->getParent(); 3267 3268 if (Destructor->isVirtual()) { 3269 SourceLocation Loc; 3270 3271 if (!Destructor->isImplicit()) 3272 Loc = Destructor->getLocation(); 3273 else 3274 Loc = RD->getLocation(); 3275 3276 // If we have a virtual destructor, look up the deallocation function 3277 FunctionDecl *OperatorDelete = 0; 3278 DeclarationName Name = 3279 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3280 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3281 return true; 3282 3283 MarkDeclarationReferenced(Loc, OperatorDelete); 3284 3285 Destructor->setOperatorDelete(OperatorDelete); 3286 } 3287 3288 return false; 3289} 3290 3291static inline bool 3292FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3293 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3294 FTI.ArgInfo[0].Param && 3295 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3296} 3297 3298/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3299/// the well-formednes of the destructor declarator @p D with type @p 3300/// R. If there are any errors in the declarator, this routine will 3301/// emit diagnostics and set the declarator to invalid. Even if this happens, 3302/// will be updated to reflect a well-formed type for the destructor and 3303/// returned. 3304QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3305 StorageClass& SC) { 3306 // C++ [class.dtor]p1: 3307 // [...] A typedef-name that names a class is a class-name 3308 // (7.1.3); however, a typedef-name that names a class shall not 3309 // be used as the identifier in the declarator for a destructor 3310 // declaration. 3311 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3312 if (isa<TypedefType>(DeclaratorType)) 3313 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3314 << DeclaratorType; 3315 3316 // C++ [class.dtor]p2: 3317 // A destructor is used to destroy objects of its class type. A 3318 // destructor takes no parameters, and no return type can be 3319 // specified for it (not even void). The address of a destructor 3320 // shall not be taken. A destructor shall not be static. A 3321 // destructor can be invoked for a const, volatile or const 3322 // volatile object. A destructor shall not be declared const, 3323 // volatile or const volatile (9.3.2). 3324 if (SC == SC_Static) { 3325 if (!D.isInvalidType()) 3326 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3327 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3328 << SourceRange(D.getIdentifierLoc()) 3329 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3330 3331 SC = SC_None; 3332 } 3333 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3334 // Destructors don't have return types, but the parser will 3335 // happily parse something like: 3336 // 3337 // class X { 3338 // float ~X(); 3339 // }; 3340 // 3341 // The return type will be eliminated later. 3342 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3343 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3344 << SourceRange(D.getIdentifierLoc()); 3345 } 3346 3347 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3348 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3349 if (FTI.TypeQuals & Qualifiers::Const) 3350 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3351 << "const" << SourceRange(D.getIdentifierLoc()); 3352 if (FTI.TypeQuals & Qualifiers::Volatile) 3353 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3354 << "volatile" << SourceRange(D.getIdentifierLoc()); 3355 if (FTI.TypeQuals & Qualifiers::Restrict) 3356 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3357 << "restrict" << SourceRange(D.getIdentifierLoc()); 3358 D.setInvalidType(); 3359 } 3360 3361 // C++0x [class.dtor]p2: 3362 // A destructor shall not be declared with a ref-qualifier. 3363 if (FTI.hasRefQualifier()) { 3364 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3365 << FTI.RefQualifierIsLValueRef 3366 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3367 D.setInvalidType(); 3368 } 3369 3370 // Make sure we don't have any parameters. 3371 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3372 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3373 3374 // Delete the parameters. 3375 FTI.freeArgs(); 3376 D.setInvalidType(); 3377 } 3378 3379 // Make sure the destructor isn't variadic. 3380 if (FTI.isVariadic) { 3381 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3382 D.setInvalidType(); 3383 } 3384 3385 // Rebuild the function type "R" without any type qualifiers or 3386 // parameters (in case any of the errors above fired) and with 3387 // "void" as the return type, since destructors don't have return 3388 // types. 3389 if (!D.isInvalidType()) 3390 return R; 3391 3392 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3393 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3394 EPI.Variadic = false; 3395 EPI.TypeQuals = 0; 3396 EPI.RefQualifier = RQ_None; 3397 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3398} 3399 3400/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3401/// well-formednes of the conversion function declarator @p D with 3402/// type @p R. If there are any errors in the declarator, this routine 3403/// will emit diagnostics and return true. Otherwise, it will return 3404/// false. Either way, the type @p R will be updated to reflect a 3405/// well-formed type for the conversion operator. 3406void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3407 StorageClass& SC) { 3408 // C++ [class.conv.fct]p1: 3409 // Neither parameter types nor return type can be specified. The 3410 // type of a conversion function (8.3.5) is "function taking no 3411 // parameter returning conversion-type-id." 3412 if (SC == SC_Static) { 3413 if (!D.isInvalidType()) 3414 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3415 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3416 << SourceRange(D.getIdentifierLoc()); 3417 D.setInvalidType(); 3418 SC = SC_None; 3419 } 3420 3421 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3422 3423 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3424 // Conversion functions don't have return types, but the parser will 3425 // happily parse something like: 3426 // 3427 // class X { 3428 // float operator bool(); 3429 // }; 3430 // 3431 // The return type will be changed later anyway. 3432 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3433 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3434 << SourceRange(D.getIdentifierLoc()); 3435 D.setInvalidType(); 3436 } 3437 3438 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3439 3440 // Make sure we don't have any parameters. 3441 if (Proto->getNumArgs() > 0) { 3442 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3443 3444 // Delete the parameters. 3445 D.getFunctionTypeInfo().freeArgs(); 3446 D.setInvalidType(); 3447 } else if (Proto->isVariadic()) { 3448 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3449 D.setInvalidType(); 3450 } 3451 3452 // Diagnose "&operator bool()" and other such nonsense. This 3453 // is actually a gcc extension which we don't support. 3454 if (Proto->getResultType() != ConvType) { 3455 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3456 << Proto->getResultType(); 3457 D.setInvalidType(); 3458 ConvType = Proto->getResultType(); 3459 } 3460 3461 // C++ [class.conv.fct]p4: 3462 // The conversion-type-id shall not represent a function type nor 3463 // an array type. 3464 if (ConvType->isArrayType()) { 3465 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3466 ConvType = Context.getPointerType(ConvType); 3467 D.setInvalidType(); 3468 } else if (ConvType->isFunctionType()) { 3469 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3470 ConvType = Context.getPointerType(ConvType); 3471 D.setInvalidType(); 3472 } 3473 3474 // Rebuild the function type "R" without any parameters (in case any 3475 // of the errors above fired) and with the conversion type as the 3476 // return type. 3477 if (D.isInvalidType()) 3478 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3479 3480 // C++0x explicit conversion operators. 3481 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3482 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3483 diag::warn_explicit_conversion_functions) 3484 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3485} 3486 3487/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3488/// the declaration of the given C++ conversion function. This routine 3489/// is responsible for recording the conversion function in the C++ 3490/// class, if possible. 3491Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3492 assert(Conversion && "Expected to receive a conversion function declaration"); 3493 3494 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3495 3496 // Make sure we aren't redeclaring the conversion function. 3497 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3498 3499 // C++ [class.conv.fct]p1: 3500 // [...] A conversion function is never used to convert a 3501 // (possibly cv-qualified) object to the (possibly cv-qualified) 3502 // same object type (or a reference to it), to a (possibly 3503 // cv-qualified) base class of that type (or a reference to it), 3504 // or to (possibly cv-qualified) void. 3505 // FIXME: Suppress this warning if the conversion function ends up being a 3506 // virtual function that overrides a virtual function in a base class. 3507 QualType ClassType 3508 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3509 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3510 ConvType = ConvTypeRef->getPointeeType(); 3511 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3512 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3513 /* Suppress diagnostics for instantiations. */; 3514 else if (ConvType->isRecordType()) { 3515 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3516 if (ConvType == ClassType) 3517 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3518 << ClassType; 3519 else if (IsDerivedFrom(ClassType, ConvType)) 3520 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3521 << ClassType << ConvType; 3522 } else if (ConvType->isVoidType()) { 3523 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3524 << ClassType << ConvType; 3525 } 3526 3527 if (FunctionTemplateDecl *ConversionTemplate 3528 = Conversion->getDescribedFunctionTemplate()) 3529 return ConversionTemplate; 3530 3531 return Conversion; 3532} 3533 3534//===----------------------------------------------------------------------===// 3535// Namespace Handling 3536//===----------------------------------------------------------------------===// 3537 3538 3539 3540/// ActOnStartNamespaceDef - This is called at the start of a namespace 3541/// definition. 3542Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3543 SourceLocation InlineLoc, 3544 SourceLocation IdentLoc, 3545 IdentifierInfo *II, 3546 SourceLocation LBrace, 3547 AttributeList *AttrList) { 3548 // anonymous namespace starts at its left brace 3549 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3550 (II ? IdentLoc : LBrace) , II); 3551 Namespc->setLBracLoc(LBrace); 3552 Namespc->setInline(InlineLoc.isValid()); 3553 3554 Scope *DeclRegionScope = NamespcScope->getParent(); 3555 3556 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3557 3558 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3559 PushNamespaceVisibilityAttr(Attr); 3560 3561 if (II) { 3562 // C++ [namespace.def]p2: 3563 // The identifier in an original-namespace-definition shall not 3564 // have been previously defined in the declarative region in 3565 // which the original-namespace-definition appears. The 3566 // identifier in an original-namespace-definition is the name of 3567 // the namespace. Subsequently in that declarative region, it is 3568 // treated as an original-namespace-name. 3569 // 3570 // Since namespace names are unique in their scope, and we don't 3571 // look through using directives, just 3572 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3573 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3574 3575 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3576 // This is an extended namespace definition. 3577 if (Namespc->isInline() != OrigNS->isInline()) { 3578 // inline-ness must match 3579 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3580 << Namespc->isInline(); 3581 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3582 Namespc->setInvalidDecl(); 3583 // Recover by ignoring the new namespace's inline status. 3584 Namespc->setInline(OrigNS->isInline()); 3585 } 3586 3587 // Attach this namespace decl to the chain of extended namespace 3588 // definitions. 3589 OrigNS->setNextNamespace(Namespc); 3590 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3591 3592 // Remove the previous declaration from the scope. 3593 if (DeclRegionScope->isDeclScope(OrigNS)) { 3594 IdResolver.RemoveDecl(OrigNS); 3595 DeclRegionScope->RemoveDecl(OrigNS); 3596 } 3597 } else if (PrevDecl) { 3598 // This is an invalid name redefinition. 3599 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3600 << Namespc->getDeclName(); 3601 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3602 Namespc->setInvalidDecl(); 3603 // Continue on to push Namespc as current DeclContext and return it. 3604 } else if (II->isStr("std") && 3605 CurContext->getRedeclContext()->isTranslationUnit()) { 3606 // This is the first "real" definition of the namespace "std", so update 3607 // our cache of the "std" namespace to point at this definition. 3608 if (NamespaceDecl *StdNS = getStdNamespace()) { 3609 // We had already defined a dummy namespace "std". Link this new 3610 // namespace definition to the dummy namespace "std". 3611 StdNS->setNextNamespace(Namespc); 3612 StdNS->setLocation(IdentLoc); 3613 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3614 } 3615 3616 // Make our StdNamespace cache point at the first real definition of the 3617 // "std" namespace. 3618 StdNamespace = Namespc; 3619 } 3620 3621 PushOnScopeChains(Namespc, DeclRegionScope); 3622 } else { 3623 // Anonymous namespaces. 3624 assert(Namespc->isAnonymousNamespace()); 3625 3626 // Link the anonymous namespace into its parent. 3627 NamespaceDecl *PrevDecl; 3628 DeclContext *Parent = CurContext->getRedeclContext(); 3629 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3630 PrevDecl = TU->getAnonymousNamespace(); 3631 TU->setAnonymousNamespace(Namespc); 3632 } else { 3633 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3634 PrevDecl = ND->getAnonymousNamespace(); 3635 ND->setAnonymousNamespace(Namespc); 3636 } 3637 3638 // Link the anonymous namespace with its previous declaration. 3639 if (PrevDecl) { 3640 assert(PrevDecl->isAnonymousNamespace()); 3641 assert(!PrevDecl->getNextNamespace()); 3642 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3643 PrevDecl->setNextNamespace(Namespc); 3644 3645 if (Namespc->isInline() != PrevDecl->isInline()) { 3646 // inline-ness must match 3647 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3648 << Namespc->isInline(); 3649 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3650 Namespc->setInvalidDecl(); 3651 // Recover by ignoring the new namespace's inline status. 3652 Namespc->setInline(PrevDecl->isInline()); 3653 } 3654 } 3655 3656 CurContext->addDecl(Namespc); 3657 3658 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3659 // behaves as if it were replaced by 3660 // namespace unique { /* empty body */ } 3661 // using namespace unique; 3662 // namespace unique { namespace-body } 3663 // where all occurrences of 'unique' in a translation unit are 3664 // replaced by the same identifier and this identifier differs 3665 // from all other identifiers in the entire program. 3666 3667 // We just create the namespace with an empty name and then add an 3668 // implicit using declaration, just like the standard suggests. 3669 // 3670 // CodeGen enforces the "universally unique" aspect by giving all 3671 // declarations semantically contained within an anonymous 3672 // namespace internal linkage. 3673 3674 if (!PrevDecl) { 3675 UsingDirectiveDecl* UD 3676 = UsingDirectiveDecl::Create(Context, CurContext, 3677 /* 'using' */ LBrace, 3678 /* 'namespace' */ SourceLocation(), 3679 /* qualifier */ NestedNameSpecifierLoc(), 3680 /* identifier */ SourceLocation(), 3681 Namespc, 3682 /* Ancestor */ CurContext); 3683 UD->setImplicit(); 3684 CurContext->addDecl(UD); 3685 } 3686 } 3687 3688 // Although we could have an invalid decl (i.e. the namespace name is a 3689 // redefinition), push it as current DeclContext and try to continue parsing. 3690 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3691 // for the namespace has the declarations that showed up in that particular 3692 // namespace definition. 3693 PushDeclContext(NamespcScope, Namespc); 3694 return Namespc; 3695} 3696 3697/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3698/// is a namespace alias, returns the namespace it points to. 3699static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3700 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3701 return AD->getNamespace(); 3702 return dyn_cast_or_null<NamespaceDecl>(D); 3703} 3704 3705/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3706/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3707void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3708 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3709 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3710 Namespc->setRBracLoc(RBrace); 3711 PopDeclContext(); 3712 if (Namespc->hasAttr<VisibilityAttr>()) 3713 PopPragmaVisibility(); 3714} 3715 3716CXXRecordDecl *Sema::getStdBadAlloc() const { 3717 return cast_or_null<CXXRecordDecl>( 3718 StdBadAlloc.get(Context.getExternalSource())); 3719} 3720 3721NamespaceDecl *Sema::getStdNamespace() const { 3722 return cast_or_null<NamespaceDecl>( 3723 StdNamespace.get(Context.getExternalSource())); 3724} 3725 3726/// \brief Retrieve the special "std" namespace, which may require us to 3727/// implicitly define the namespace. 3728NamespaceDecl *Sema::getOrCreateStdNamespace() { 3729 if (!StdNamespace) { 3730 // The "std" namespace has not yet been defined, so build one implicitly. 3731 StdNamespace = NamespaceDecl::Create(Context, 3732 Context.getTranslationUnitDecl(), 3733 SourceLocation(), 3734 &PP.getIdentifierTable().get("std")); 3735 getStdNamespace()->setImplicit(true); 3736 } 3737 3738 return getStdNamespace(); 3739} 3740 3741Decl *Sema::ActOnUsingDirective(Scope *S, 3742 SourceLocation UsingLoc, 3743 SourceLocation NamespcLoc, 3744 CXXScopeSpec &SS, 3745 SourceLocation IdentLoc, 3746 IdentifierInfo *NamespcName, 3747 AttributeList *AttrList) { 3748 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3749 assert(NamespcName && "Invalid NamespcName."); 3750 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3751 3752 // This can only happen along a recovery path. 3753 while (S->getFlags() & Scope::TemplateParamScope) 3754 S = S->getParent(); 3755 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3756 3757 UsingDirectiveDecl *UDir = 0; 3758 NestedNameSpecifier *Qualifier = 0; 3759 if (SS.isSet()) 3760 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3761 3762 // Lookup namespace name. 3763 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3764 LookupParsedName(R, S, &SS); 3765 if (R.isAmbiguous()) 3766 return 0; 3767 3768 if (R.empty()) { 3769 // Allow "using namespace std;" or "using namespace ::std;" even if 3770 // "std" hasn't been defined yet, for GCC compatibility. 3771 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3772 NamespcName->isStr("std")) { 3773 Diag(IdentLoc, diag::ext_using_undefined_std); 3774 R.addDecl(getOrCreateStdNamespace()); 3775 R.resolveKind(); 3776 } 3777 // Otherwise, attempt typo correction. 3778 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3779 CTC_NoKeywords, 0)) { 3780 if (R.getAsSingle<NamespaceDecl>() || 3781 R.getAsSingle<NamespaceAliasDecl>()) { 3782 if (DeclContext *DC = computeDeclContext(SS, false)) 3783 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3784 << NamespcName << DC << Corrected << SS.getRange() 3785 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3786 else 3787 Diag(IdentLoc, diag::err_using_directive_suggest) 3788 << NamespcName << Corrected 3789 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3790 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3791 << Corrected; 3792 3793 NamespcName = Corrected.getAsIdentifierInfo(); 3794 } else { 3795 R.clear(); 3796 R.setLookupName(NamespcName); 3797 } 3798 } 3799 } 3800 3801 if (!R.empty()) { 3802 NamedDecl *Named = R.getFoundDecl(); 3803 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3804 && "expected namespace decl"); 3805 // C++ [namespace.udir]p1: 3806 // A using-directive specifies that the names in the nominated 3807 // namespace can be used in the scope in which the 3808 // using-directive appears after the using-directive. During 3809 // unqualified name lookup (3.4.1), the names appear as if they 3810 // were declared in the nearest enclosing namespace which 3811 // contains both the using-directive and the nominated 3812 // namespace. [Note: in this context, "contains" means "contains 3813 // directly or indirectly". ] 3814 3815 // Find enclosing context containing both using-directive and 3816 // nominated namespace. 3817 NamespaceDecl *NS = getNamespaceDecl(Named); 3818 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3819 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3820 CommonAncestor = CommonAncestor->getParent(); 3821 3822 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3823 SS.getWithLocInContext(Context), 3824 IdentLoc, Named, CommonAncestor); 3825 PushUsingDirective(S, UDir); 3826 } else { 3827 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3828 } 3829 3830 // FIXME: We ignore attributes for now. 3831 return UDir; 3832} 3833 3834void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3835 // If scope has associated entity, then using directive is at namespace 3836 // or translation unit scope. We add UsingDirectiveDecls, into 3837 // it's lookup structure. 3838 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3839 Ctx->addDecl(UDir); 3840 else 3841 // Otherwise it is block-sope. using-directives will affect lookup 3842 // only to the end of scope. 3843 S->PushUsingDirective(UDir); 3844} 3845 3846 3847Decl *Sema::ActOnUsingDeclaration(Scope *S, 3848 AccessSpecifier AS, 3849 bool HasUsingKeyword, 3850 SourceLocation UsingLoc, 3851 CXXScopeSpec &SS, 3852 UnqualifiedId &Name, 3853 AttributeList *AttrList, 3854 bool IsTypeName, 3855 SourceLocation TypenameLoc) { 3856 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3857 3858 switch (Name.getKind()) { 3859 case UnqualifiedId::IK_Identifier: 3860 case UnqualifiedId::IK_OperatorFunctionId: 3861 case UnqualifiedId::IK_LiteralOperatorId: 3862 case UnqualifiedId::IK_ConversionFunctionId: 3863 break; 3864 3865 case UnqualifiedId::IK_ConstructorName: 3866 case UnqualifiedId::IK_ConstructorTemplateId: 3867 // C++0x inherited constructors. 3868 if (getLangOptions().CPlusPlus0x) break; 3869 3870 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3871 << SS.getRange(); 3872 return 0; 3873 3874 case UnqualifiedId::IK_DestructorName: 3875 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3876 << SS.getRange(); 3877 return 0; 3878 3879 case UnqualifiedId::IK_TemplateId: 3880 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3881 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3882 return 0; 3883 } 3884 3885 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3886 DeclarationName TargetName = TargetNameInfo.getName(); 3887 if (!TargetName) 3888 return 0; 3889 3890 // Warn about using declarations. 3891 // TODO: store that the declaration was written without 'using' and 3892 // talk about access decls instead of using decls in the 3893 // diagnostics. 3894 if (!HasUsingKeyword) { 3895 UsingLoc = Name.getSourceRange().getBegin(); 3896 3897 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3898 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3899 } 3900 3901 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3902 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3903 return 0; 3904 3905 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3906 TargetNameInfo, AttrList, 3907 /* IsInstantiation */ false, 3908 IsTypeName, TypenameLoc); 3909 if (UD) 3910 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3911 3912 return UD; 3913} 3914 3915/// \brief Determine whether a using declaration considers the given 3916/// declarations as "equivalent", e.g., if they are redeclarations of 3917/// the same entity or are both typedefs of the same type. 3918static bool 3919IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3920 bool &SuppressRedeclaration) { 3921 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3922 SuppressRedeclaration = false; 3923 return true; 3924 } 3925 3926 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3927 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3928 SuppressRedeclaration = true; 3929 return Context.hasSameType(TD1->getUnderlyingType(), 3930 TD2->getUnderlyingType()); 3931 } 3932 3933 return false; 3934} 3935 3936 3937/// Determines whether to create a using shadow decl for a particular 3938/// decl, given the set of decls existing prior to this using lookup. 3939bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3940 const LookupResult &Previous) { 3941 // Diagnose finding a decl which is not from a base class of the 3942 // current class. We do this now because there are cases where this 3943 // function will silently decide not to build a shadow decl, which 3944 // will pre-empt further diagnostics. 3945 // 3946 // We don't need to do this in C++0x because we do the check once on 3947 // the qualifier. 3948 // 3949 // FIXME: diagnose the following if we care enough: 3950 // struct A { int foo; }; 3951 // struct B : A { using A::foo; }; 3952 // template <class T> struct C : A {}; 3953 // template <class T> struct D : C<T> { using B::foo; } // <--- 3954 // This is invalid (during instantiation) in C++03 because B::foo 3955 // resolves to the using decl in B, which is not a base class of D<T>. 3956 // We can't diagnose it immediately because C<T> is an unknown 3957 // specialization. The UsingShadowDecl in D<T> then points directly 3958 // to A::foo, which will look well-formed when we instantiate. 3959 // The right solution is to not collapse the shadow-decl chain. 3960 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3961 DeclContext *OrigDC = Orig->getDeclContext(); 3962 3963 // Handle enums and anonymous structs. 3964 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3965 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3966 while (OrigRec->isAnonymousStructOrUnion()) 3967 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3968 3969 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3970 if (OrigDC == CurContext) { 3971 Diag(Using->getLocation(), 3972 diag::err_using_decl_nested_name_specifier_is_current_class) 3973 << Using->getQualifierLoc().getSourceRange(); 3974 Diag(Orig->getLocation(), diag::note_using_decl_target); 3975 return true; 3976 } 3977 3978 Diag(Using->getQualifierLoc().getBeginLoc(), 3979 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3980 << Using->getQualifier() 3981 << cast<CXXRecordDecl>(CurContext) 3982 << Using->getQualifierLoc().getSourceRange(); 3983 Diag(Orig->getLocation(), diag::note_using_decl_target); 3984 return true; 3985 } 3986 } 3987 3988 if (Previous.empty()) return false; 3989 3990 NamedDecl *Target = Orig; 3991 if (isa<UsingShadowDecl>(Target)) 3992 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3993 3994 // If the target happens to be one of the previous declarations, we 3995 // don't have a conflict. 3996 // 3997 // FIXME: but we might be increasing its access, in which case we 3998 // should redeclare it. 3999 NamedDecl *NonTag = 0, *Tag = 0; 4000 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4001 I != E; ++I) { 4002 NamedDecl *D = (*I)->getUnderlyingDecl(); 4003 bool Result; 4004 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4005 return Result; 4006 4007 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4008 } 4009 4010 if (Target->isFunctionOrFunctionTemplate()) { 4011 FunctionDecl *FD; 4012 if (isa<FunctionTemplateDecl>(Target)) 4013 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4014 else 4015 FD = cast<FunctionDecl>(Target); 4016 4017 NamedDecl *OldDecl = 0; 4018 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4019 case Ovl_Overload: 4020 return false; 4021 4022 case Ovl_NonFunction: 4023 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4024 break; 4025 4026 // We found a decl with the exact signature. 4027 case Ovl_Match: 4028 // If we're in a record, we want to hide the target, so we 4029 // return true (without a diagnostic) to tell the caller not to 4030 // build a shadow decl. 4031 if (CurContext->isRecord()) 4032 return true; 4033 4034 // If we're not in a record, this is an error. 4035 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4036 break; 4037 } 4038 4039 Diag(Target->getLocation(), diag::note_using_decl_target); 4040 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4041 return true; 4042 } 4043 4044 // Target is not a function. 4045 4046 if (isa<TagDecl>(Target)) { 4047 // No conflict between a tag and a non-tag. 4048 if (!Tag) return false; 4049 4050 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4051 Diag(Target->getLocation(), diag::note_using_decl_target); 4052 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4053 return true; 4054 } 4055 4056 // No conflict between a tag and a non-tag. 4057 if (!NonTag) return false; 4058 4059 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4060 Diag(Target->getLocation(), diag::note_using_decl_target); 4061 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4062 return true; 4063} 4064 4065/// Builds a shadow declaration corresponding to a 'using' declaration. 4066UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4067 UsingDecl *UD, 4068 NamedDecl *Orig) { 4069 4070 // If we resolved to another shadow declaration, just coalesce them. 4071 NamedDecl *Target = Orig; 4072 if (isa<UsingShadowDecl>(Target)) { 4073 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4074 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4075 } 4076 4077 UsingShadowDecl *Shadow 4078 = UsingShadowDecl::Create(Context, CurContext, 4079 UD->getLocation(), UD, Target); 4080 UD->addShadowDecl(Shadow); 4081 4082 Shadow->setAccess(UD->getAccess()); 4083 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4084 Shadow->setInvalidDecl(); 4085 4086 if (S) 4087 PushOnScopeChains(Shadow, S); 4088 else 4089 CurContext->addDecl(Shadow); 4090 4091 4092 return Shadow; 4093} 4094 4095/// Hides a using shadow declaration. This is required by the current 4096/// using-decl implementation when a resolvable using declaration in a 4097/// class is followed by a declaration which would hide or override 4098/// one or more of the using decl's targets; for example: 4099/// 4100/// struct Base { void foo(int); }; 4101/// struct Derived : Base { 4102/// using Base::foo; 4103/// void foo(int); 4104/// }; 4105/// 4106/// The governing language is C++03 [namespace.udecl]p12: 4107/// 4108/// When a using-declaration brings names from a base class into a 4109/// derived class scope, member functions in the derived class 4110/// override and/or hide member functions with the same name and 4111/// parameter types in a base class (rather than conflicting). 4112/// 4113/// There are two ways to implement this: 4114/// (1) optimistically create shadow decls when they're not hidden 4115/// by existing declarations, or 4116/// (2) don't create any shadow decls (or at least don't make them 4117/// visible) until we've fully parsed/instantiated the class. 4118/// The problem with (1) is that we might have to retroactively remove 4119/// a shadow decl, which requires several O(n) operations because the 4120/// decl structures are (very reasonably) not designed for removal. 4121/// (2) avoids this but is very fiddly and phase-dependent. 4122void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4123 if (Shadow->getDeclName().getNameKind() == 4124 DeclarationName::CXXConversionFunctionName) 4125 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4126 4127 // Remove it from the DeclContext... 4128 Shadow->getDeclContext()->removeDecl(Shadow); 4129 4130 // ...and the scope, if applicable... 4131 if (S) { 4132 S->RemoveDecl(Shadow); 4133 IdResolver.RemoveDecl(Shadow); 4134 } 4135 4136 // ...and the using decl. 4137 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4138 4139 // TODO: complain somehow if Shadow was used. It shouldn't 4140 // be possible for this to happen, because...? 4141} 4142 4143/// Builds a using declaration. 4144/// 4145/// \param IsInstantiation - Whether this call arises from an 4146/// instantiation of an unresolved using declaration. We treat 4147/// the lookup differently for these declarations. 4148NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4149 SourceLocation UsingLoc, 4150 CXXScopeSpec &SS, 4151 const DeclarationNameInfo &NameInfo, 4152 AttributeList *AttrList, 4153 bool IsInstantiation, 4154 bool IsTypeName, 4155 SourceLocation TypenameLoc) { 4156 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4157 SourceLocation IdentLoc = NameInfo.getLoc(); 4158 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4159 4160 // FIXME: We ignore attributes for now. 4161 4162 if (SS.isEmpty()) { 4163 Diag(IdentLoc, diag::err_using_requires_qualname); 4164 return 0; 4165 } 4166 4167 // Do the redeclaration lookup in the current scope. 4168 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4169 ForRedeclaration); 4170 Previous.setHideTags(false); 4171 if (S) { 4172 LookupName(Previous, S); 4173 4174 // It is really dumb that we have to do this. 4175 LookupResult::Filter F = Previous.makeFilter(); 4176 while (F.hasNext()) { 4177 NamedDecl *D = F.next(); 4178 if (!isDeclInScope(D, CurContext, S)) 4179 F.erase(); 4180 } 4181 F.done(); 4182 } else { 4183 assert(IsInstantiation && "no scope in non-instantiation"); 4184 assert(CurContext->isRecord() && "scope not record in instantiation"); 4185 LookupQualifiedName(Previous, CurContext); 4186 } 4187 4188 // Check for invalid redeclarations. 4189 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4190 return 0; 4191 4192 // Check for bad qualifiers. 4193 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4194 return 0; 4195 4196 DeclContext *LookupContext = computeDeclContext(SS); 4197 NamedDecl *D; 4198 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4199 if (!LookupContext) { 4200 if (IsTypeName) { 4201 // FIXME: not all declaration name kinds are legal here 4202 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4203 UsingLoc, TypenameLoc, 4204 QualifierLoc, 4205 IdentLoc, NameInfo.getName()); 4206 } else { 4207 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4208 QualifierLoc, NameInfo); 4209 } 4210 } else { 4211 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4212 NameInfo, IsTypeName); 4213 } 4214 D->setAccess(AS); 4215 CurContext->addDecl(D); 4216 4217 if (!LookupContext) return D; 4218 UsingDecl *UD = cast<UsingDecl>(D); 4219 4220 if (RequireCompleteDeclContext(SS, LookupContext)) { 4221 UD->setInvalidDecl(); 4222 return UD; 4223 } 4224 4225 // Constructor inheriting using decls get special treatment. 4226 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4227 if (CheckInheritedConstructorUsingDecl(UD)) 4228 UD->setInvalidDecl(); 4229 return UD; 4230 } 4231 4232 // Otherwise, look up the target name. 4233 4234 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4235 4236 // Unlike most lookups, we don't always want to hide tag 4237 // declarations: tag names are visible through the using declaration 4238 // even if hidden by ordinary names, *except* in a dependent context 4239 // where it's important for the sanity of two-phase lookup. 4240 if (!IsInstantiation) 4241 R.setHideTags(false); 4242 4243 LookupQualifiedName(R, LookupContext); 4244 4245 if (R.empty()) { 4246 Diag(IdentLoc, diag::err_no_member) 4247 << NameInfo.getName() << LookupContext << SS.getRange(); 4248 UD->setInvalidDecl(); 4249 return UD; 4250 } 4251 4252 if (R.isAmbiguous()) { 4253 UD->setInvalidDecl(); 4254 return UD; 4255 } 4256 4257 if (IsTypeName) { 4258 // If we asked for a typename and got a non-type decl, error out. 4259 if (!R.getAsSingle<TypeDecl>()) { 4260 Diag(IdentLoc, diag::err_using_typename_non_type); 4261 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4262 Diag((*I)->getUnderlyingDecl()->getLocation(), 4263 diag::note_using_decl_target); 4264 UD->setInvalidDecl(); 4265 return UD; 4266 } 4267 } else { 4268 // If we asked for a non-typename and we got a type, error out, 4269 // but only if this is an instantiation of an unresolved using 4270 // decl. Otherwise just silently find the type name. 4271 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4272 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4273 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4274 UD->setInvalidDecl(); 4275 return UD; 4276 } 4277 } 4278 4279 // C++0x N2914 [namespace.udecl]p6: 4280 // A using-declaration shall not name a namespace. 4281 if (R.getAsSingle<NamespaceDecl>()) { 4282 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4283 << SS.getRange(); 4284 UD->setInvalidDecl(); 4285 return UD; 4286 } 4287 4288 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4289 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4290 BuildUsingShadowDecl(S, UD, *I); 4291 } 4292 4293 return UD; 4294} 4295 4296/// Additional checks for a using declaration referring to a constructor name. 4297bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4298 if (UD->isTypeName()) { 4299 // FIXME: Cannot specify typename when specifying constructor 4300 return true; 4301 } 4302 4303 const Type *SourceType = UD->getQualifier()->getAsType(); 4304 assert(SourceType && 4305 "Using decl naming constructor doesn't have type in scope spec."); 4306 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4307 4308 // Check whether the named type is a direct base class. 4309 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4310 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4311 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4312 BaseIt != BaseE; ++BaseIt) { 4313 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4314 if (CanonicalSourceType == BaseType) 4315 break; 4316 } 4317 4318 if (BaseIt == BaseE) { 4319 // Did not find SourceType in the bases. 4320 Diag(UD->getUsingLocation(), 4321 diag::err_using_decl_constructor_not_in_direct_base) 4322 << UD->getNameInfo().getSourceRange() 4323 << QualType(SourceType, 0) << TargetClass; 4324 return true; 4325 } 4326 4327 BaseIt->setInheritConstructors(); 4328 4329 return false; 4330} 4331 4332/// Checks that the given using declaration is not an invalid 4333/// redeclaration. Note that this is checking only for the using decl 4334/// itself, not for any ill-formedness among the UsingShadowDecls. 4335bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4336 bool isTypeName, 4337 const CXXScopeSpec &SS, 4338 SourceLocation NameLoc, 4339 const LookupResult &Prev) { 4340 // C++03 [namespace.udecl]p8: 4341 // C++0x [namespace.udecl]p10: 4342 // A using-declaration is a declaration and can therefore be used 4343 // repeatedly where (and only where) multiple declarations are 4344 // allowed. 4345 // 4346 // That's in non-member contexts. 4347 if (!CurContext->getRedeclContext()->isRecord()) 4348 return false; 4349 4350 NestedNameSpecifier *Qual 4351 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4352 4353 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4354 NamedDecl *D = *I; 4355 4356 bool DTypename; 4357 NestedNameSpecifier *DQual; 4358 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4359 DTypename = UD->isTypeName(); 4360 DQual = UD->getQualifier(); 4361 } else if (UnresolvedUsingValueDecl *UD 4362 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4363 DTypename = false; 4364 DQual = UD->getQualifier(); 4365 } else if (UnresolvedUsingTypenameDecl *UD 4366 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4367 DTypename = true; 4368 DQual = UD->getQualifier(); 4369 } else continue; 4370 4371 // using decls differ if one says 'typename' and the other doesn't. 4372 // FIXME: non-dependent using decls? 4373 if (isTypeName != DTypename) continue; 4374 4375 // using decls differ if they name different scopes (but note that 4376 // template instantiation can cause this check to trigger when it 4377 // didn't before instantiation). 4378 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4379 Context.getCanonicalNestedNameSpecifier(DQual)) 4380 continue; 4381 4382 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4383 Diag(D->getLocation(), diag::note_using_decl) << 1; 4384 return true; 4385 } 4386 4387 return false; 4388} 4389 4390 4391/// Checks that the given nested-name qualifier used in a using decl 4392/// in the current context is appropriately related to the current 4393/// scope. If an error is found, diagnoses it and returns true. 4394bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4395 const CXXScopeSpec &SS, 4396 SourceLocation NameLoc) { 4397 DeclContext *NamedContext = computeDeclContext(SS); 4398 4399 if (!CurContext->isRecord()) { 4400 // C++03 [namespace.udecl]p3: 4401 // C++0x [namespace.udecl]p8: 4402 // A using-declaration for a class member shall be a member-declaration. 4403 4404 // If we weren't able to compute a valid scope, it must be a 4405 // dependent class scope. 4406 if (!NamedContext || NamedContext->isRecord()) { 4407 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4408 << SS.getRange(); 4409 return true; 4410 } 4411 4412 // Otherwise, everything is known to be fine. 4413 return false; 4414 } 4415 4416 // The current scope is a record. 4417 4418 // If the named context is dependent, we can't decide much. 4419 if (!NamedContext) { 4420 // FIXME: in C++0x, we can diagnose if we can prove that the 4421 // nested-name-specifier does not refer to a base class, which is 4422 // still possible in some cases. 4423 4424 // Otherwise we have to conservatively report that things might be 4425 // okay. 4426 return false; 4427 } 4428 4429 if (!NamedContext->isRecord()) { 4430 // Ideally this would point at the last name in the specifier, 4431 // but we don't have that level of source info. 4432 Diag(SS.getRange().getBegin(), 4433 diag::err_using_decl_nested_name_specifier_is_not_class) 4434 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4435 return true; 4436 } 4437 4438 if (!NamedContext->isDependentContext() && 4439 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4440 return true; 4441 4442 if (getLangOptions().CPlusPlus0x) { 4443 // C++0x [namespace.udecl]p3: 4444 // In a using-declaration used as a member-declaration, the 4445 // nested-name-specifier shall name a base class of the class 4446 // being defined. 4447 4448 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4449 cast<CXXRecordDecl>(NamedContext))) { 4450 if (CurContext == NamedContext) { 4451 Diag(NameLoc, 4452 diag::err_using_decl_nested_name_specifier_is_current_class) 4453 << SS.getRange(); 4454 return true; 4455 } 4456 4457 Diag(SS.getRange().getBegin(), 4458 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4459 << (NestedNameSpecifier*) SS.getScopeRep() 4460 << cast<CXXRecordDecl>(CurContext) 4461 << SS.getRange(); 4462 return true; 4463 } 4464 4465 return false; 4466 } 4467 4468 // C++03 [namespace.udecl]p4: 4469 // A using-declaration used as a member-declaration shall refer 4470 // to a member of a base class of the class being defined [etc.]. 4471 4472 // Salient point: SS doesn't have to name a base class as long as 4473 // lookup only finds members from base classes. Therefore we can 4474 // diagnose here only if we can prove that that can't happen, 4475 // i.e. if the class hierarchies provably don't intersect. 4476 4477 // TODO: it would be nice if "definitely valid" results were cached 4478 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4479 // need to be repeated. 4480 4481 struct UserData { 4482 llvm::DenseSet<const CXXRecordDecl*> Bases; 4483 4484 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4485 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4486 Data->Bases.insert(Base); 4487 return true; 4488 } 4489 4490 bool hasDependentBases(const CXXRecordDecl *Class) { 4491 return !Class->forallBases(collect, this); 4492 } 4493 4494 /// Returns true if the base is dependent or is one of the 4495 /// accumulated base classes. 4496 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4497 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4498 return !Data->Bases.count(Base); 4499 } 4500 4501 bool mightShareBases(const CXXRecordDecl *Class) { 4502 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4503 } 4504 }; 4505 4506 UserData Data; 4507 4508 // Returns false if we find a dependent base. 4509 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4510 return false; 4511 4512 // Returns false if the class has a dependent base or if it or one 4513 // of its bases is present in the base set of the current context. 4514 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4515 return false; 4516 4517 Diag(SS.getRange().getBegin(), 4518 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4519 << (NestedNameSpecifier*) SS.getScopeRep() 4520 << cast<CXXRecordDecl>(CurContext) 4521 << SS.getRange(); 4522 4523 return true; 4524} 4525 4526Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4527 SourceLocation NamespaceLoc, 4528 SourceLocation AliasLoc, 4529 IdentifierInfo *Alias, 4530 CXXScopeSpec &SS, 4531 SourceLocation IdentLoc, 4532 IdentifierInfo *Ident) { 4533 4534 // Lookup the namespace name. 4535 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4536 LookupParsedName(R, S, &SS); 4537 4538 // Check if we have a previous declaration with the same name. 4539 NamedDecl *PrevDecl 4540 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4541 ForRedeclaration); 4542 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4543 PrevDecl = 0; 4544 4545 if (PrevDecl) { 4546 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4547 // We already have an alias with the same name that points to the same 4548 // namespace, so don't create a new one. 4549 // FIXME: At some point, we'll want to create the (redundant) 4550 // declaration to maintain better source information. 4551 if (!R.isAmbiguous() && !R.empty() && 4552 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4553 return 0; 4554 } 4555 4556 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4557 diag::err_redefinition_different_kind; 4558 Diag(AliasLoc, DiagID) << Alias; 4559 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4560 return 0; 4561 } 4562 4563 if (R.isAmbiguous()) 4564 return 0; 4565 4566 if (R.empty()) { 4567 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4568 CTC_NoKeywords, 0)) { 4569 if (R.getAsSingle<NamespaceDecl>() || 4570 R.getAsSingle<NamespaceAliasDecl>()) { 4571 if (DeclContext *DC = computeDeclContext(SS, false)) 4572 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4573 << Ident << DC << Corrected << SS.getRange() 4574 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4575 else 4576 Diag(IdentLoc, diag::err_using_directive_suggest) 4577 << Ident << Corrected 4578 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4579 4580 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4581 << Corrected; 4582 4583 Ident = Corrected.getAsIdentifierInfo(); 4584 } else { 4585 R.clear(); 4586 R.setLookupName(Ident); 4587 } 4588 } 4589 4590 if (R.empty()) { 4591 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4592 return 0; 4593 } 4594 } 4595 4596 NamespaceAliasDecl *AliasDecl = 4597 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4598 Alias, SS.getWithLocInContext(Context), 4599 IdentLoc, R.getFoundDecl()); 4600 4601 PushOnScopeChains(AliasDecl, S); 4602 return AliasDecl; 4603} 4604 4605namespace { 4606 /// \brief Scoped object used to handle the state changes required in Sema 4607 /// to implicitly define the body of a C++ member function; 4608 class ImplicitlyDefinedFunctionScope { 4609 Sema &S; 4610 Sema::ContextRAII SavedContext; 4611 4612 public: 4613 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4614 : S(S), SavedContext(S, Method) 4615 { 4616 S.PushFunctionScope(); 4617 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4618 } 4619 4620 ~ImplicitlyDefinedFunctionScope() { 4621 S.PopExpressionEvaluationContext(); 4622 S.PopFunctionOrBlockScope(); 4623 } 4624 }; 4625} 4626 4627static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4628 CXXRecordDecl *D) { 4629 ASTContext &Context = Self.Context; 4630 QualType ClassType = Context.getTypeDeclType(D); 4631 DeclarationName ConstructorName 4632 = Context.DeclarationNames.getCXXConstructorName( 4633 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4634 4635 DeclContext::lookup_const_iterator Con, ConEnd; 4636 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4637 Con != ConEnd; ++Con) { 4638 // FIXME: In C++0x, a constructor template can be a default constructor. 4639 if (isa<FunctionTemplateDecl>(*Con)) 4640 continue; 4641 4642 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4643 if (Constructor->isDefaultConstructor()) 4644 return Constructor; 4645 } 4646 return 0; 4647} 4648 4649CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4650 CXXRecordDecl *ClassDecl) { 4651 // C++ [class.ctor]p5: 4652 // A default constructor for a class X is a constructor of class X 4653 // that can be called without an argument. If there is no 4654 // user-declared constructor for class X, a default constructor is 4655 // implicitly declared. An implicitly-declared default constructor 4656 // is an inline public member of its class. 4657 assert(!ClassDecl->hasUserDeclaredConstructor() && 4658 "Should not build implicit default constructor!"); 4659 4660 // C++ [except.spec]p14: 4661 // An implicitly declared special member function (Clause 12) shall have an 4662 // exception-specification. [...] 4663 ImplicitExceptionSpecification ExceptSpec(Context); 4664 4665 // Direct base-class destructors. 4666 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4667 BEnd = ClassDecl->bases_end(); 4668 B != BEnd; ++B) { 4669 if (B->isVirtual()) // Handled below. 4670 continue; 4671 4672 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4673 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4674 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4675 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4676 else if (CXXConstructorDecl *Constructor 4677 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4678 ExceptSpec.CalledDecl(Constructor); 4679 } 4680 } 4681 4682 // Virtual base-class destructors. 4683 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4684 BEnd = ClassDecl->vbases_end(); 4685 B != BEnd; ++B) { 4686 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4687 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4688 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4689 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4690 else if (CXXConstructorDecl *Constructor 4691 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4692 ExceptSpec.CalledDecl(Constructor); 4693 } 4694 } 4695 4696 // Field destructors. 4697 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4698 FEnd = ClassDecl->field_end(); 4699 F != FEnd; ++F) { 4700 if (const RecordType *RecordTy 4701 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4702 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4703 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4704 ExceptSpec.CalledDecl( 4705 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4706 else if (CXXConstructorDecl *Constructor 4707 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4708 ExceptSpec.CalledDecl(Constructor); 4709 } 4710 } 4711 4712 FunctionProtoType::ExtProtoInfo EPI; 4713 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4714 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4715 EPI.NumExceptions = ExceptSpec.size(); 4716 EPI.Exceptions = ExceptSpec.data(); 4717 4718 // Create the actual constructor declaration. 4719 CanQualType ClassType 4720 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4721 DeclarationName Name 4722 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4723 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4724 CXXConstructorDecl *DefaultCon 4725 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4726 Context.getFunctionType(Context.VoidTy, 4727 0, 0, EPI), 4728 /*TInfo=*/0, 4729 /*isExplicit=*/false, 4730 /*isInline=*/true, 4731 /*isImplicitlyDeclared=*/true); 4732 DefaultCon->setAccess(AS_public); 4733 DefaultCon->setImplicit(); 4734 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4735 4736 // Note that we have declared this constructor. 4737 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4738 4739 if (Scope *S = getScopeForContext(ClassDecl)) 4740 PushOnScopeChains(DefaultCon, S, false); 4741 ClassDecl->addDecl(DefaultCon); 4742 4743 return DefaultCon; 4744} 4745 4746void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4747 CXXConstructorDecl *Constructor) { 4748 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4749 !Constructor->isUsed(false)) && 4750 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4751 4752 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4753 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4754 4755 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4756 DiagnosticErrorTrap Trap(Diags); 4757 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4758 Trap.hasErrorOccurred()) { 4759 Diag(CurrentLocation, diag::note_member_synthesized_at) 4760 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4761 Constructor->setInvalidDecl(); 4762 return; 4763 } 4764 4765 SourceLocation Loc = Constructor->getLocation(); 4766 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4767 4768 Constructor->setUsed(); 4769 MarkVTableUsed(CurrentLocation, ClassDecl); 4770} 4771 4772void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4773 // We start with an initial pass over the base classes to collect those that 4774 // inherit constructors from. If there are none, we can forgo all further 4775 // processing. 4776 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4777 BasesVector BasesToInheritFrom; 4778 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4779 BaseE = ClassDecl->bases_end(); 4780 BaseIt != BaseE; ++BaseIt) { 4781 if (BaseIt->getInheritConstructors()) { 4782 QualType Base = BaseIt->getType(); 4783 if (Base->isDependentType()) { 4784 // If we inherit constructors from anything that is dependent, just 4785 // abort processing altogether. We'll get another chance for the 4786 // instantiations. 4787 return; 4788 } 4789 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4790 } 4791 } 4792 if (BasesToInheritFrom.empty()) 4793 return; 4794 4795 // Now collect the constructors that we already have in the current class. 4796 // Those take precedence over inherited constructors. 4797 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4798 // unless there is a user-declared constructor with the same signature in 4799 // the class where the using-declaration appears. 4800 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4801 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4802 CtorE = ClassDecl->ctor_end(); 4803 CtorIt != CtorE; ++CtorIt) { 4804 ExistingConstructors.insert( 4805 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4806 } 4807 4808 Scope *S = getScopeForContext(ClassDecl); 4809 DeclarationName CreatedCtorName = 4810 Context.DeclarationNames.getCXXConstructorName( 4811 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4812 4813 // Now comes the true work. 4814 // First, we keep a map from constructor types to the base that introduced 4815 // them. Needed for finding conflicting constructors. We also keep the 4816 // actually inserted declarations in there, for pretty diagnostics. 4817 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4818 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4819 ConstructorToSourceMap InheritedConstructors; 4820 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4821 BaseE = BasesToInheritFrom.end(); 4822 BaseIt != BaseE; ++BaseIt) { 4823 const RecordType *Base = *BaseIt; 4824 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4825 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4826 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4827 CtorE = BaseDecl->ctor_end(); 4828 CtorIt != CtorE; ++CtorIt) { 4829 // Find the using declaration for inheriting this base's constructors. 4830 DeclarationName Name = 4831 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4832 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4833 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4834 SourceLocation UsingLoc = UD ? UD->getLocation() : 4835 ClassDecl->getLocation(); 4836 4837 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4838 // from the class X named in the using-declaration consists of actual 4839 // constructors and notional constructors that result from the 4840 // transformation of defaulted parameters as follows: 4841 // - all non-template default constructors of X, and 4842 // - for each non-template constructor of X that has at least one 4843 // parameter with a default argument, the set of constructors that 4844 // results from omitting any ellipsis parameter specification and 4845 // successively omitting parameters with a default argument from the 4846 // end of the parameter-type-list. 4847 CXXConstructorDecl *BaseCtor = *CtorIt; 4848 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4849 const FunctionProtoType *BaseCtorType = 4850 BaseCtor->getType()->getAs<FunctionProtoType>(); 4851 4852 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4853 maxParams = BaseCtor->getNumParams(); 4854 params <= maxParams; ++params) { 4855 // Skip default constructors. They're never inherited. 4856 if (params == 0) 4857 continue; 4858 // Skip copy and move constructors for the same reason. 4859 if (CanBeCopyOrMove && params == 1) 4860 continue; 4861 4862 // Build up a function type for this particular constructor. 4863 // FIXME: The working paper does not consider that the exception spec 4864 // for the inheriting constructor might be larger than that of the 4865 // source. This code doesn't yet, either. 4866 const Type *NewCtorType; 4867 if (params == maxParams) 4868 NewCtorType = BaseCtorType; 4869 else { 4870 llvm::SmallVector<QualType, 16> Args; 4871 for (unsigned i = 0; i < params; ++i) { 4872 Args.push_back(BaseCtorType->getArgType(i)); 4873 } 4874 FunctionProtoType::ExtProtoInfo ExtInfo = 4875 BaseCtorType->getExtProtoInfo(); 4876 ExtInfo.Variadic = false; 4877 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4878 Args.data(), params, ExtInfo) 4879 .getTypePtr(); 4880 } 4881 const Type *CanonicalNewCtorType = 4882 Context.getCanonicalType(NewCtorType); 4883 4884 // Now that we have the type, first check if the class already has a 4885 // constructor with this signature. 4886 if (ExistingConstructors.count(CanonicalNewCtorType)) 4887 continue; 4888 4889 // Then we check if we have already declared an inherited constructor 4890 // with this signature. 4891 std::pair<ConstructorToSourceMap::iterator, bool> result = 4892 InheritedConstructors.insert(std::make_pair( 4893 CanonicalNewCtorType, 4894 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4895 if (!result.second) { 4896 // Already in the map. If it came from a different class, that's an 4897 // error. Not if it's from the same. 4898 CanQualType PreviousBase = result.first->second.first; 4899 if (CanonicalBase != PreviousBase) { 4900 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4901 const CXXConstructorDecl *PrevBaseCtor = 4902 PrevCtor->getInheritedConstructor(); 4903 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4904 4905 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4906 Diag(BaseCtor->getLocation(), 4907 diag::note_using_decl_constructor_conflict_current_ctor); 4908 Diag(PrevBaseCtor->getLocation(), 4909 diag::note_using_decl_constructor_conflict_previous_ctor); 4910 Diag(PrevCtor->getLocation(), 4911 diag::note_using_decl_constructor_conflict_previous_using); 4912 } 4913 continue; 4914 } 4915 4916 // OK, we're there, now add the constructor. 4917 // C++0x [class.inhctor]p8: [...] that would be performed by a 4918 // user-writtern inline constructor [...] 4919 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4920 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4921 Context, ClassDecl, DNI, QualType(NewCtorType, 0), /*TInfo=*/0, 4922 BaseCtor->isExplicit(), /*Inline=*/true, 4923 /*ImplicitlyDeclared=*/true); 4924 NewCtor->setAccess(BaseCtor->getAccess()); 4925 4926 // Build up the parameter decls and add them. 4927 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4928 for (unsigned i = 0; i < params; ++i) { 4929 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, UsingLoc, 4930 /*IdentifierInfo=*/0, 4931 BaseCtorType->getArgType(i), 4932 /*TInfo=*/0, SC_None, 4933 SC_None, /*DefaultArg=*/0)); 4934 } 4935 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4936 NewCtor->setInheritedConstructor(BaseCtor); 4937 4938 PushOnScopeChains(NewCtor, S, false); 4939 ClassDecl->addDecl(NewCtor); 4940 result.first->second.second = NewCtor; 4941 } 4942 } 4943 } 4944} 4945 4946CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4947 // C++ [class.dtor]p2: 4948 // If a class has no user-declared destructor, a destructor is 4949 // declared implicitly. An implicitly-declared destructor is an 4950 // inline public member of its class. 4951 4952 // C++ [except.spec]p14: 4953 // An implicitly declared special member function (Clause 12) shall have 4954 // an exception-specification. 4955 ImplicitExceptionSpecification ExceptSpec(Context); 4956 4957 // Direct base-class destructors. 4958 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4959 BEnd = ClassDecl->bases_end(); 4960 B != BEnd; ++B) { 4961 if (B->isVirtual()) // Handled below. 4962 continue; 4963 4964 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4965 ExceptSpec.CalledDecl( 4966 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4967 } 4968 4969 // Virtual base-class destructors. 4970 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4971 BEnd = ClassDecl->vbases_end(); 4972 B != BEnd; ++B) { 4973 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4974 ExceptSpec.CalledDecl( 4975 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4976 } 4977 4978 // Field destructors. 4979 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4980 FEnd = ClassDecl->field_end(); 4981 F != FEnd; ++F) { 4982 if (const RecordType *RecordTy 4983 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4984 ExceptSpec.CalledDecl( 4985 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4986 } 4987 4988 // Create the actual destructor declaration. 4989 FunctionProtoType::ExtProtoInfo EPI; 4990 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4991 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4992 EPI.NumExceptions = ExceptSpec.size(); 4993 EPI.Exceptions = ExceptSpec.data(); 4994 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4995 4996 CanQualType ClassType 4997 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4998 DeclarationName Name 4999 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5000 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5001 CXXDestructorDecl *Destructor 5002 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 5003 /*isInline=*/true, 5004 /*isImplicitlyDeclared=*/true); 5005 Destructor->setAccess(AS_public); 5006 Destructor->setImplicit(); 5007 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5008 5009 // Note that we have declared this destructor. 5010 ++ASTContext::NumImplicitDestructorsDeclared; 5011 5012 // Introduce this destructor into its scope. 5013 if (Scope *S = getScopeForContext(ClassDecl)) 5014 PushOnScopeChains(Destructor, S, false); 5015 ClassDecl->addDecl(Destructor); 5016 5017 // This could be uniqued if it ever proves significant. 5018 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5019 5020 AddOverriddenMethods(ClassDecl, Destructor); 5021 5022 return Destructor; 5023} 5024 5025void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5026 CXXDestructorDecl *Destructor) { 5027 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5028 "DefineImplicitDestructor - call it for implicit default dtor"); 5029 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5030 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5031 5032 if (Destructor->isInvalidDecl()) 5033 return; 5034 5035 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5036 5037 DiagnosticErrorTrap Trap(Diags); 5038 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5039 Destructor->getParent()); 5040 5041 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5042 Diag(CurrentLocation, diag::note_member_synthesized_at) 5043 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5044 5045 Destructor->setInvalidDecl(); 5046 return; 5047 } 5048 5049 SourceLocation Loc = Destructor->getLocation(); 5050 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5051 5052 Destructor->setUsed(); 5053 MarkVTableUsed(CurrentLocation, ClassDecl); 5054} 5055 5056/// \brief Builds a statement that copies the given entity from \p From to 5057/// \c To. 5058/// 5059/// This routine is used to copy the members of a class with an 5060/// implicitly-declared copy assignment operator. When the entities being 5061/// copied are arrays, this routine builds for loops to copy them. 5062/// 5063/// \param S The Sema object used for type-checking. 5064/// 5065/// \param Loc The location where the implicit copy is being generated. 5066/// 5067/// \param T The type of the expressions being copied. Both expressions must 5068/// have this type. 5069/// 5070/// \param To The expression we are copying to. 5071/// 5072/// \param From The expression we are copying from. 5073/// 5074/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5075/// Otherwise, it's a non-static member subobject. 5076/// 5077/// \param Depth Internal parameter recording the depth of the recursion. 5078/// 5079/// \returns A statement or a loop that copies the expressions. 5080static StmtResult 5081BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5082 Expr *To, Expr *From, 5083 bool CopyingBaseSubobject, unsigned Depth = 0) { 5084 // C++0x [class.copy]p30: 5085 // Each subobject is assigned in the manner appropriate to its type: 5086 // 5087 // - if the subobject is of class type, the copy assignment operator 5088 // for the class is used (as if by explicit qualification; that is, 5089 // ignoring any possible virtual overriding functions in more derived 5090 // classes); 5091 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5092 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5093 5094 // Look for operator=. 5095 DeclarationName Name 5096 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5097 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5098 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5099 5100 // Filter out any result that isn't a copy-assignment operator. 5101 LookupResult::Filter F = OpLookup.makeFilter(); 5102 while (F.hasNext()) { 5103 NamedDecl *D = F.next(); 5104 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5105 if (Method->isCopyAssignmentOperator()) 5106 continue; 5107 5108 F.erase(); 5109 } 5110 F.done(); 5111 5112 // Suppress the protected check (C++ [class.protected]) for each of the 5113 // assignment operators we found. This strange dance is required when 5114 // we're assigning via a base classes's copy-assignment operator. To 5115 // ensure that we're getting the right base class subobject (without 5116 // ambiguities), we need to cast "this" to that subobject type; to 5117 // ensure that we don't go through the virtual call mechanism, we need 5118 // to qualify the operator= name with the base class (see below). However, 5119 // this means that if the base class has a protected copy assignment 5120 // operator, the protected member access check will fail. So, we 5121 // rewrite "protected" access to "public" access in this case, since we 5122 // know by construction that we're calling from a derived class. 5123 if (CopyingBaseSubobject) { 5124 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5125 L != LEnd; ++L) { 5126 if (L.getAccess() == AS_protected) 5127 L.setAccess(AS_public); 5128 } 5129 } 5130 5131 // Create the nested-name-specifier that will be used to qualify the 5132 // reference to operator=; this is required to suppress the virtual 5133 // call mechanism. 5134 CXXScopeSpec SS; 5135 SS.MakeTrivial(S.Context, 5136 NestedNameSpecifier::Create(S.Context, 0, false, 5137 T.getTypePtr()), 5138 Loc); 5139 5140 // Create the reference to operator=. 5141 ExprResult OpEqualRef 5142 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5143 /*FirstQualifierInScope=*/0, OpLookup, 5144 /*TemplateArgs=*/0, 5145 /*SuppressQualifierCheck=*/true); 5146 if (OpEqualRef.isInvalid()) 5147 return StmtError(); 5148 5149 // Build the call to the assignment operator. 5150 5151 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5152 OpEqualRef.takeAs<Expr>(), 5153 Loc, &From, 1, Loc); 5154 if (Call.isInvalid()) 5155 return StmtError(); 5156 5157 return S.Owned(Call.takeAs<Stmt>()); 5158 } 5159 5160 // - if the subobject is of scalar type, the built-in assignment 5161 // operator is used. 5162 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5163 if (!ArrayTy) { 5164 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5165 if (Assignment.isInvalid()) 5166 return StmtError(); 5167 5168 return S.Owned(Assignment.takeAs<Stmt>()); 5169 } 5170 5171 // - if the subobject is an array, each element is assigned, in the 5172 // manner appropriate to the element type; 5173 5174 // Construct a loop over the array bounds, e.g., 5175 // 5176 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5177 // 5178 // that will copy each of the array elements. 5179 QualType SizeType = S.Context.getSizeType(); 5180 5181 // Create the iteration variable. 5182 IdentifierInfo *IterationVarName = 0; 5183 { 5184 llvm::SmallString<8> Str; 5185 llvm::raw_svector_ostream OS(Str); 5186 OS << "__i" << Depth; 5187 IterationVarName = &S.Context.Idents.get(OS.str()); 5188 } 5189 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 5190 IterationVarName, SizeType, 5191 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5192 SC_None, SC_None); 5193 5194 // Initialize the iteration variable to zero. 5195 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5196 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5197 5198 // Create a reference to the iteration variable; we'll use this several 5199 // times throughout. 5200 Expr *IterationVarRef 5201 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5202 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5203 5204 // Create the DeclStmt that holds the iteration variable. 5205 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5206 5207 // Create the comparison against the array bound. 5208 llvm::APInt Upper 5209 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5210 Expr *Comparison 5211 = new (S.Context) BinaryOperator(IterationVarRef, 5212 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5213 BO_NE, S.Context.BoolTy, 5214 VK_RValue, OK_Ordinary, Loc); 5215 5216 // Create the pre-increment of the iteration variable. 5217 Expr *Increment 5218 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5219 VK_LValue, OK_Ordinary, Loc); 5220 5221 // Subscript the "from" and "to" expressions with the iteration variable. 5222 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5223 IterationVarRef, Loc)); 5224 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5225 IterationVarRef, Loc)); 5226 5227 // Build the copy for an individual element of the array. 5228 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5229 To, From, CopyingBaseSubobject, 5230 Depth + 1); 5231 if (Copy.isInvalid()) 5232 return StmtError(); 5233 5234 // Construct the loop that copies all elements of this array. 5235 return S.ActOnForStmt(Loc, Loc, InitStmt, 5236 S.MakeFullExpr(Comparison), 5237 0, S.MakeFullExpr(Increment), 5238 Loc, Copy.take()); 5239} 5240 5241/// \brief Determine whether the given class has a copy assignment operator 5242/// that accepts a const-qualified argument. 5243static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5244 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5245 5246 if (!Class->hasDeclaredCopyAssignment()) 5247 S.DeclareImplicitCopyAssignment(Class); 5248 5249 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5250 DeclarationName OpName 5251 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5252 5253 DeclContext::lookup_const_iterator Op, OpEnd; 5254 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5255 // C++ [class.copy]p9: 5256 // A user-declared copy assignment operator is a non-static non-template 5257 // member function of class X with exactly one parameter of type X, X&, 5258 // const X&, volatile X& or const volatile X&. 5259 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5260 if (!Method) 5261 continue; 5262 5263 if (Method->isStatic()) 5264 continue; 5265 if (Method->getPrimaryTemplate()) 5266 continue; 5267 const FunctionProtoType *FnType = 5268 Method->getType()->getAs<FunctionProtoType>(); 5269 assert(FnType && "Overloaded operator has no prototype."); 5270 // Don't assert on this; an invalid decl might have been left in the AST. 5271 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5272 continue; 5273 bool AcceptsConst = true; 5274 QualType ArgType = FnType->getArgType(0); 5275 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5276 ArgType = Ref->getPointeeType(); 5277 // Is it a non-const lvalue reference? 5278 if (!ArgType.isConstQualified()) 5279 AcceptsConst = false; 5280 } 5281 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5282 continue; 5283 5284 // We have a single argument of type cv X or cv X&, i.e. we've found the 5285 // copy assignment operator. Return whether it accepts const arguments. 5286 return AcceptsConst; 5287 } 5288 assert(Class->isInvalidDecl() && 5289 "No copy assignment operator declared in valid code."); 5290 return false; 5291} 5292 5293CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5294 // Note: The following rules are largely analoguous to the copy 5295 // constructor rules. Note that virtual bases are not taken into account 5296 // for determining the argument type of the operator. Note also that 5297 // operators taking an object instead of a reference are allowed. 5298 5299 5300 // C++ [class.copy]p10: 5301 // If the class definition does not explicitly declare a copy 5302 // assignment operator, one is declared implicitly. 5303 // The implicitly-defined copy assignment operator for a class X 5304 // will have the form 5305 // 5306 // X& X::operator=(const X&) 5307 // 5308 // if 5309 bool HasConstCopyAssignment = true; 5310 5311 // -- each direct base class B of X has a copy assignment operator 5312 // whose parameter is of type const B&, const volatile B& or B, 5313 // and 5314 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5315 BaseEnd = ClassDecl->bases_end(); 5316 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5317 assert(!Base->getType()->isDependentType() && 5318 "Cannot generate implicit members for class with dependent bases."); 5319 const CXXRecordDecl *BaseClassDecl 5320 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5321 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5322 } 5323 5324 // -- for all the nonstatic data members of X that are of a class 5325 // type M (or array thereof), each such class type has a copy 5326 // assignment operator whose parameter is of type const M&, 5327 // const volatile M& or M. 5328 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5329 FieldEnd = ClassDecl->field_end(); 5330 HasConstCopyAssignment && Field != FieldEnd; 5331 ++Field) { 5332 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5333 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5334 const CXXRecordDecl *FieldClassDecl 5335 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5336 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5337 } 5338 } 5339 5340 // Otherwise, the implicitly declared copy assignment operator will 5341 // have the form 5342 // 5343 // X& X::operator=(X&) 5344 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5345 QualType RetType = Context.getLValueReferenceType(ArgType); 5346 if (HasConstCopyAssignment) 5347 ArgType = ArgType.withConst(); 5348 ArgType = Context.getLValueReferenceType(ArgType); 5349 5350 // C++ [except.spec]p14: 5351 // An implicitly declared special member function (Clause 12) shall have an 5352 // exception-specification. [...] 5353 ImplicitExceptionSpecification ExceptSpec(Context); 5354 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5355 BaseEnd = ClassDecl->bases_end(); 5356 Base != BaseEnd; ++Base) { 5357 CXXRecordDecl *BaseClassDecl 5358 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5359 5360 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5361 DeclareImplicitCopyAssignment(BaseClassDecl); 5362 5363 if (CXXMethodDecl *CopyAssign 5364 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5365 ExceptSpec.CalledDecl(CopyAssign); 5366 } 5367 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5368 FieldEnd = ClassDecl->field_end(); 5369 Field != FieldEnd; 5370 ++Field) { 5371 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5372 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5373 CXXRecordDecl *FieldClassDecl 5374 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5375 5376 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5377 DeclareImplicitCopyAssignment(FieldClassDecl); 5378 5379 if (CXXMethodDecl *CopyAssign 5380 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5381 ExceptSpec.CalledDecl(CopyAssign); 5382 } 5383 } 5384 5385 // An implicitly-declared copy assignment operator is an inline public 5386 // member of its class. 5387 FunctionProtoType::ExtProtoInfo EPI; 5388 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5389 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5390 EPI.NumExceptions = ExceptSpec.size(); 5391 EPI.Exceptions = ExceptSpec.data(); 5392 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5393 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5394 CXXMethodDecl *CopyAssignment 5395 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5396 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5397 /*TInfo=*/0, /*isStatic=*/false, 5398 /*StorageClassAsWritten=*/SC_None, 5399 /*isInline=*/true); 5400 CopyAssignment->setAccess(AS_public); 5401 CopyAssignment->setImplicit(); 5402 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5403 5404 // Add the parameter to the operator. 5405 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5406 ClassDecl->getLocation(), 5407 /*Id=*/0, 5408 ArgType, /*TInfo=*/0, 5409 SC_None, 5410 SC_None, 0); 5411 CopyAssignment->setParams(&FromParam, 1); 5412 5413 // Note that we have added this copy-assignment operator. 5414 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5415 5416 if (Scope *S = getScopeForContext(ClassDecl)) 5417 PushOnScopeChains(CopyAssignment, S, false); 5418 ClassDecl->addDecl(CopyAssignment); 5419 5420 AddOverriddenMethods(ClassDecl, CopyAssignment); 5421 return CopyAssignment; 5422} 5423 5424void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5425 CXXMethodDecl *CopyAssignOperator) { 5426 assert((CopyAssignOperator->isImplicit() && 5427 CopyAssignOperator->isOverloadedOperator() && 5428 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5429 !CopyAssignOperator->isUsed(false)) && 5430 "DefineImplicitCopyAssignment called for wrong function"); 5431 5432 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5433 5434 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5435 CopyAssignOperator->setInvalidDecl(); 5436 return; 5437 } 5438 5439 CopyAssignOperator->setUsed(); 5440 5441 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5442 DiagnosticErrorTrap Trap(Diags); 5443 5444 // C++0x [class.copy]p30: 5445 // The implicitly-defined or explicitly-defaulted copy assignment operator 5446 // for a non-union class X performs memberwise copy assignment of its 5447 // subobjects. The direct base classes of X are assigned first, in the 5448 // order of their declaration in the base-specifier-list, and then the 5449 // immediate non-static data members of X are assigned, in the order in 5450 // which they were declared in the class definition. 5451 5452 // The statements that form the synthesized function body. 5453 ASTOwningVector<Stmt*> Statements(*this); 5454 5455 // The parameter for the "other" object, which we are copying from. 5456 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5457 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5458 QualType OtherRefType = Other->getType(); 5459 if (const LValueReferenceType *OtherRef 5460 = OtherRefType->getAs<LValueReferenceType>()) { 5461 OtherRefType = OtherRef->getPointeeType(); 5462 OtherQuals = OtherRefType.getQualifiers(); 5463 } 5464 5465 // Our location for everything implicitly-generated. 5466 SourceLocation Loc = CopyAssignOperator->getLocation(); 5467 5468 // Construct a reference to the "other" object. We'll be using this 5469 // throughout the generated ASTs. 5470 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5471 assert(OtherRef && "Reference to parameter cannot fail!"); 5472 5473 // Construct the "this" pointer. We'll be using this throughout the generated 5474 // ASTs. 5475 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5476 assert(This && "Reference to this cannot fail!"); 5477 5478 // Assign base classes. 5479 bool Invalid = false; 5480 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5481 E = ClassDecl->bases_end(); Base != E; ++Base) { 5482 // Form the assignment: 5483 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5484 QualType BaseType = Base->getType().getUnqualifiedType(); 5485 if (!BaseType->isRecordType()) { 5486 Invalid = true; 5487 continue; 5488 } 5489 5490 CXXCastPath BasePath; 5491 BasePath.push_back(Base); 5492 5493 // Construct the "from" expression, which is an implicit cast to the 5494 // appropriately-qualified base type. 5495 Expr *From = OtherRef; 5496 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5497 CK_UncheckedDerivedToBase, 5498 VK_LValue, &BasePath); 5499 5500 // Dereference "this". 5501 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5502 5503 // Implicitly cast "this" to the appropriately-qualified base type. 5504 Expr *ToE = To.takeAs<Expr>(); 5505 ImpCastExprToType(ToE, 5506 Context.getCVRQualifiedType(BaseType, 5507 CopyAssignOperator->getTypeQualifiers()), 5508 CK_UncheckedDerivedToBase, 5509 VK_LValue, &BasePath); 5510 To = Owned(ToE); 5511 5512 // Build the copy. 5513 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5514 To.get(), From, 5515 /*CopyingBaseSubobject=*/true); 5516 if (Copy.isInvalid()) { 5517 Diag(CurrentLocation, diag::note_member_synthesized_at) 5518 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5519 CopyAssignOperator->setInvalidDecl(); 5520 return; 5521 } 5522 5523 // Success! Record the copy. 5524 Statements.push_back(Copy.takeAs<Expr>()); 5525 } 5526 5527 // \brief Reference to the __builtin_memcpy function. 5528 Expr *BuiltinMemCpyRef = 0; 5529 // \brief Reference to the __builtin_objc_memmove_collectable function. 5530 Expr *CollectableMemCpyRef = 0; 5531 5532 // Assign non-static members. 5533 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5534 FieldEnd = ClassDecl->field_end(); 5535 Field != FieldEnd; ++Field) { 5536 // Check for members of reference type; we can't copy those. 5537 if (Field->getType()->isReferenceType()) { 5538 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5539 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5540 Diag(Field->getLocation(), diag::note_declared_at); 5541 Diag(CurrentLocation, diag::note_member_synthesized_at) 5542 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5543 Invalid = true; 5544 continue; 5545 } 5546 5547 // Check for members of const-qualified, non-class type. 5548 QualType BaseType = Context.getBaseElementType(Field->getType()); 5549 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5550 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5551 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5552 Diag(Field->getLocation(), diag::note_declared_at); 5553 Diag(CurrentLocation, diag::note_member_synthesized_at) 5554 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5555 Invalid = true; 5556 continue; 5557 } 5558 5559 QualType FieldType = Field->getType().getNonReferenceType(); 5560 if (FieldType->isIncompleteArrayType()) { 5561 assert(ClassDecl->hasFlexibleArrayMember() && 5562 "Incomplete array type is not valid"); 5563 continue; 5564 } 5565 5566 // Build references to the field in the object we're copying from and to. 5567 CXXScopeSpec SS; // Intentionally empty 5568 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5569 LookupMemberName); 5570 MemberLookup.addDecl(*Field); 5571 MemberLookup.resolveKind(); 5572 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5573 Loc, /*IsArrow=*/false, 5574 SS, 0, MemberLookup, 0); 5575 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5576 Loc, /*IsArrow=*/true, 5577 SS, 0, MemberLookup, 0); 5578 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5579 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5580 5581 // If the field should be copied with __builtin_memcpy rather than via 5582 // explicit assignments, do so. This optimization only applies for arrays 5583 // of scalars and arrays of class type with trivial copy-assignment 5584 // operators. 5585 if (FieldType->isArrayType() && 5586 (!BaseType->isRecordType() || 5587 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5588 ->hasTrivialCopyAssignment())) { 5589 // Compute the size of the memory buffer to be copied. 5590 QualType SizeType = Context.getSizeType(); 5591 llvm::APInt Size(Context.getTypeSize(SizeType), 5592 Context.getTypeSizeInChars(BaseType).getQuantity()); 5593 for (const ConstantArrayType *Array 5594 = Context.getAsConstantArrayType(FieldType); 5595 Array; 5596 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5597 llvm::APInt ArraySize 5598 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5599 Size *= ArraySize; 5600 } 5601 5602 // Take the address of the field references for "from" and "to". 5603 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5604 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5605 5606 bool NeedsCollectableMemCpy = 5607 (BaseType->isRecordType() && 5608 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5609 5610 if (NeedsCollectableMemCpy) { 5611 if (!CollectableMemCpyRef) { 5612 // Create a reference to the __builtin_objc_memmove_collectable function. 5613 LookupResult R(*this, 5614 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5615 Loc, LookupOrdinaryName); 5616 LookupName(R, TUScope, true); 5617 5618 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5619 if (!CollectableMemCpy) { 5620 // Something went horribly wrong earlier, and we will have 5621 // complained about it. 5622 Invalid = true; 5623 continue; 5624 } 5625 5626 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5627 CollectableMemCpy->getType(), 5628 VK_LValue, Loc, 0).take(); 5629 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5630 } 5631 } 5632 // Create a reference to the __builtin_memcpy builtin function. 5633 else if (!BuiltinMemCpyRef) { 5634 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5635 LookupOrdinaryName); 5636 LookupName(R, TUScope, true); 5637 5638 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5639 if (!BuiltinMemCpy) { 5640 // Something went horribly wrong earlier, and we will have complained 5641 // about it. 5642 Invalid = true; 5643 continue; 5644 } 5645 5646 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5647 BuiltinMemCpy->getType(), 5648 VK_LValue, Loc, 0).take(); 5649 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5650 } 5651 5652 ASTOwningVector<Expr*> CallArgs(*this); 5653 CallArgs.push_back(To.takeAs<Expr>()); 5654 CallArgs.push_back(From.takeAs<Expr>()); 5655 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5656 ExprResult Call = ExprError(); 5657 if (NeedsCollectableMemCpy) 5658 Call = ActOnCallExpr(/*Scope=*/0, 5659 CollectableMemCpyRef, 5660 Loc, move_arg(CallArgs), 5661 Loc); 5662 else 5663 Call = ActOnCallExpr(/*Scope=*/0, 5664 BuiltinMemCpyRef, 5665 Loc, move_arg(CallArgs), 5666 Loc); 5667 5668 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5669 Statements.push_back(Call.takeAs<Expr>()); 5670 continue; 5671 } 5672 5673 // Build the copy of this field. 5674 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5675 To.get(), From.get(), 5676 /*CopyingBaseSubobject=*/false); 5677 if (Copy.isInvalid()) { 5678 Diag(CurrentLocation, diag::note_member_synthesized_at) 5679 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5680 CopyAssignOperator->setInvalidDecl(); 5681 return; 5682 } 5683 5684 // Success! Record the copy. 5685 Statements.push_back(Copy.takeAs<Stmt>()); 5686 } 5687 5688 if (!Invalid) { 5689 // Add a "return *this;" 5690 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5691 5692 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5693 if (Return.isInvalid()) 5694 Invalid = true; 5695 else { 5696 Statements.push_back(Return.takeAs<Stmt>()); 5697 5698 if (Trap.hasErrorOccurred()) { 5699 Diag(CurrentLocation, diag::note_member_synthesized_at) 5700 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5701 Invalid = true; 5702 } 5703 } 5704 } 5705 5706 if (Invalid) { 5707 CopyAssignOperator->setInvalidDecl(); 5708 return; 5709 } 5710 5711 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5712 /*isStmtExpr=*/false); 5713 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5714 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5715} 5716 5717CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5718 CXXRecordDecl *ClassDecl) { 5719 // C++ [class.copy]p4: 5720 // If the class definition does not explicitly declare a copy 5721 // constructor, one is declared implicitly. 5722 5723 // C++ [class.copy]p5: 5724 // The implicitly-declared copy constructor for a class X will 5725 // have the form 5726 // 5727 // X::X(const X&) 5728 // 5729 // if 5730 bool HasConstCopyConstructor = true; 5731 5732 // -- each direct or virtual base class B of X has a copy 5733 // constructor whose first parameter is of type const B& or 5734 // const volatile B&, and 5735 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5736 BaseEnd = ClassDecl->bases_end(); 5737 HasConstCopyConstructor && Base != BaseEnd; 5738 ++Base) { 5739 // Virtual bases are handled below. 5740 if (Base->isVirtual()) 5741 continue; 5742 5743 CXXRecordDecl *BaseClassDecl 5744 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5745 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5746 DeclareImplicitCopyConstructor(BaseClassDecl); 5747 5748 HasConstCopyConstructor 5749 = BaseClassDecl->hasConstCopyConstructor(Context); 5750 } 5751 5752 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5753 BaseEnd = ClassDecl->vbases_end(); 5754 HasConstCopyConstructor && Base != BaseEnd; 5755 ++Base) { 5756 CXXRecordDecl *BaseClassDecl 5757 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5758 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5759 DeclareImplicitCopyConstructor(BaseClassDecl); 5760 5761 HasConstCopyConstructor 5762 = BaseClassDecl->hasConstCopyConstructor(Context); 5763 } 5764 5765 // -- for all the nonstatic data members of X that are of a 5766 // class type M (or array thereof), each such class type 5767 // has a copy constructor whose first parameter is of type 5768 // const M& or const volatile M&. 5769 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5770 FieldEnd = ClassDecl->field_end(); 5771 HasConstCopyConstructor && Field != FieldEnd; 5772 ++Field) { 5773 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5774 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5775 CXXRecordDecl *FieldClassDecl 5776 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5777 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5778 DeclareImplicitCopyConstructor(FieldClassDecl); 5779 5780 HasConstCopyConstructor 5781 = FieldClassDecl->hasConstCopyConstructor(Context); 5782 } 5783 } 5784 5785 // Otherwise, the implicitly declared copy constructor will have 5786 // the form 5787 // 5788 // X::X(X&) 5789 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5790 QualType ArgType = ClassType; 5791 if (HasConstCopyConstructor) 5792 ArgType = ArgType.withConst(); 5793 ArgType = Context.getLValueReferenceType(ArgType); 5794 5795 // C++ [except.spec]p14: 5796 // An implicitly declared special member function (Clause 12) shall have an 5797 // exception-specification. [...] 5798 ImplicitExceptionSpecification ExceptSpec(Context); 5799 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5800 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5801 BaseEnd = ClassDecl->bases_end(); 5802 Base != BaseEnd; 5803 ++Base) { 5804 // Virtual bases are handled below. 5805 if (Base->isVirtual()) 5806 continue; 5807 5808 CXXRecordDecl *BaseClassDecl 5809 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5810 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5811 DeclareImplicitCopyConstructor(BaseClassDecl); 5812 5813 if (CXXConstructorDecl *CopyConstructor 5814 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5815 ExceptSpec.CalledDecl(CopyConstructor); 5816 } 5817 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5818 BaseEnd = ClassDecl->vbases_end(); 5819 Base != BaseEnd; 5820 ++Base) { 5821 CXXRecordDecl *BaseClassDecl 5822 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5823 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5824 DeclareImplicitCopyConstructor(BaseClassDecl); 5825 5826 if (CXXConstructorDecl *CopyConstructor 5827 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5828 ExceptSpec.CalledDecl(CopyConstructor); 5829 } 5830 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5831 FieldEnd = ClassDecl->field_end(); 5832 Field != FieldEnd; 5833 ++Field) { 5834 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5835 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5836 CXXRecordDecl *FieldClassDecl 5837 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5838 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5839 DeclareImplicitCopyConstructor(FieldClassDecl); 5840 5841 if (CXXConstructorDecl *CopyConstructor 5842 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5843 ExceptSpec.CalledDecl(CopyConstructor); 5844 } 5845 } 5846 5847 // An implicitly-declared copy constructor is an inline public 5848 // member of its class. 5849 FunctionProtoType::ExtProtoInfo EPI; 5850 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5851 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5852 EPI.NumExceptions = ExceptSpec.size(); 5853 EPI.Exceptions = ExceptSpec.data(); 5854 DeclarationName Name 5855 = Context.DeclarationNames.getCXXConstructorName( 5856 Context.getCanonicalType(ClassType)); 5857 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5858 CXXConstructorDecl *CopyConstructor 5859 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5860 Context.getFunctionType(Context.VoidTy, 5861 &ArgType, 1, EPI), 5862 /*TInfo=*/0, 5863 /*isExplicit=*/false, 5864 /*isInline=*/true, 5865 /*isImplicitlyDeclared=*/true); 5866 CopyConstructor->setAccess(AS_public); 5867 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5868 5869 // Note that we have declared this constructor. 5870 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5871 5872 // Add the parameter to the constructor. 5873 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5874 ClassDecl->getLocation(), 5875 /*IdentifierInfo=*/0, 5876 ArgType, /*TInfo=*/0, 5877 SC_None, 5878 SC_None, 0); 5879 CopyConstructor->setParams(&FromParam, 1); 5880 if (Scope *S = getScopeForContext(ClassDecl)) 5881 PushOnScopeChains(CopyConstructor, S, false); 5882 ClassDecl->addDecl(CopyConstructor); 5883 5884 return CopyConstructor; 5885} 5886 5887void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5888 CXXConstructorDecl *CopyConstructor, 5889 unsigned TypeQuals) { 5890 assert((CopyConstructor->isImplicit() && 5891 CopyConstructor->isCopyConstructor(TypeQuals) && 5892 !CopyConstructor->isUsed(false)) && 5893 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5894 5895 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5896 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5897 5898 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5899 DiagnosticErrorTrap Trap(Diags); 5900 5901 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5902 Trap.hasErrorOccurred()) { 5903 Diag(CurrentLocation, diag::note_member_synthesized_at) 5904 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5905 CopyConstructor->setInvalidDecl(); 5906 } else { 5907 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5908 CopyConstructor->getLocation(), 5909 MultiStmtArg(*this, 0, 0), 5910 /*isStmtExpr=*/false) 5911 .takeAs<Stmt>()); 5912 } 5913 5914 CopyConstructor->setUsed(); 5915} 5916 5917ExprResult 5918Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5919 CXXConstructorDecl *Constructor, 5920 MultiExprArg ExprArgs, 5921 bool RequiresZeroInit, 5922 unsigned ConstructKind, 5923 SourceRange ParenRange) { 5924 bool Elidable = false; 5925 5926 // C++0x [class.copy]p34: 5927 // When certain criteria are met, an implementation is allowed to 5928 // omit the copy/move construction of a class object, even if the 5929 // copy/move constructor and/or destructor for the object have 5930 // side effects. [...] 5931 // - when a temporary class object that has not been bound to a 5932 // reference (12.2) would be copied/moved to a class object 5933 // with the same cv-unqualified type, the copy/move operation 5934 // can be omitted by constructing the temporary object 5935 // directly into the target of the omitted copy/move 5936 if (ConstructKind == CXXConstructExpr::CK_Complete && 5937 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5938 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5939 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5940 } 5941 5942 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5943 Elidable, move(ExprArgs), RequiresZeroInit, 5944 ConstructKind, ParenRange); 5945} 5946 5947/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5948/// including handling of its default argument expressions. 5949ExprResult 5950Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5951 CXXConstructorDecl *Constructor, bool Elidable, 5952 MultiExprArg ExprArgs, 5953 bool RequiresZeroInit, 5954 unsigned ConstructKind, 5955 SourceRange ParenRange) { 5956 unsigned NumExprs = ExprArgs.size(); 5957 Expr **Exprs = (Expr **)ExprArgs.release(); 5958 5959 MarkDeclarationReferenced(ConstructLoc, Constructor); 5960 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5961 Constructor, Elidable, Exprs, NumExprs, 5962 RequiresZeroInit, 5963 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5964 ParenRange)); 5965} 5966 5967bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5968 CXXConstructorDecl *Constructor, 5969 MultiExprArg Exprs) { 5970 // FIXME: Provide the correct paren SourceRange when available. 5971 ExprResult TempResult = 5972 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5973 move(Exprs), false, CXXConstructExpr::CK_Complete, 5974 SourceRange()); 5975 if (TempResult.isInvalid()) 5976 return true; 5977 5978 Expr *Temp = TempResult.takeAs<Expr>(); 5979 CheckImplicitConversions(Temp, VD->getLocation()); 5980 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5981 Temp = MaybeCreateExprWithCleanups(Temp); 5982 VD->setInit(Temp); 5983 5984 return false; 5985} 5986 5987void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5988 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5989 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5990 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5991 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5992 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5993 CheckDestructorAccess(VD->getLocation(), Destructor, 5994 PDiag(diag::err_access_dtor_var) 5995 << VD->getDeclName() 5996 << VD->getType()); 5997 5998 // TODO: this should be re-enabled for static locals by !CXAAtExit 5999 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 6000 Diag(VD->getLocation(), diag::warn_global_destructor); 6001 } 6002} 6003 6004/// AddCXXDirectInitializerToDecl - This action is called immediately after 6005/// ActOnDeclarator, when a C++ direct initializer is present. 6006/// e.g: "int x(1);" 6007void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6008 SourceLocation LParenLoc, 6009 MultiExprArg Exprs, 6010 SourceLocation RParenLoc, 6011 bool TypeMayContainAuto) { 6012 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6013 6014 // If there is no declaration, there was an error parsing it. Just ignore 6015 // the initializer. 6016 if (RealDecl == 0) 6017 return; 6018 6019 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6020 if (!VDecl) { 6021 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6022 RealDecl->setInvalidDecl(); 6023 return; 6024 } 6025 6026 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6027 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6028 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6029 if (Exprs.size() > 1) { 6030 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6031 diag::err_auto_var_init_multiple_expressions) 6032 << VDecl->getDeclName() << VDecl->getType() 6033 << VDecl->getSourceRange(); 6034 RealDecl->setInvalidDecl(); 6035 return; 6036 } 6037 6038 Expr *Init = Exprs.get()[0]; 6039 QualType DeducedType; 6040 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 6041 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6042 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6043 << Init->getSourceRange(); 6044 RealDecl->setInvalidDecl(); 6045 return; 6046 } 6047 VDecl->setType(DeducedType); 6048 6049 // If this is a redeclaration, check that the type we just deduced matches 6050 // the previously declared type. 6051 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6052 MergeVarDeclTypes(VDecl, Old); 6053 } 6054 6055 // We will represent direct-initialization similarly to copy-initialization: 6056 // int x(1); -as-> int x = 1; 6057 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6058 // 6059 // Clients that want to distinguish between the two forms, can check for 6060 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6061 // A major benefit is that clients that don't particularly care about which 6062 // exactly form was it (like the CodeGen) can handle both cases without 6063 // special case code. 6064 6065 // C++ 8.5p11: 6066 // The form of initialization (using parentheses or '=') is generally 6067 // insignificant, but does matter when the entity being initialized has a 6068 // class type. 6069 6070 if (!VDecl->getType()->isDependentType() && 6071 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6072 diag::err_typecheck_decl_incomplete_type)) { 6073 VDecl->setInvalidDecl(); 6074 return; 6075 } 6076 6077 // The variable can not have an abstract class type. 6078 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6079 diag::err_abstract_type_in_decl, 6080 AbstractVariableType)) 6081 VDecl->setInvalidDecl(); 6082 6083 const VarDecl *Def; 6084 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6085 Diag(VDecl->getLocation(), diag::err_redefinition) 6086 << VDecl->getDeclName(); 6087 Diag(Def->getLocation(), diag::note_previous_definition); 6088 VDecl->setInvalidDecl(); 6089 return; 6090 } 6091 6092 // C++ [class.static.data]p4 6093 // If a static data member is of const integral or const 6094 // enumeration type, its declaration in the class definition can 6095 // specify a constant-initializer which shall be an integral 6096 // constant expression (5.19). In that case, the member can appear 6097 // in integral constant expressions. The member shall still be 6098 // defined in a namespace scope if it is used in the program and the 6099 // namespace scope definition shall not contain an initializer. 6100 // 6101 // We already performed a redefinition check above, but for static 6102 // data members we also need to check whether there was an in-class 6103 // declaration with an initializer. 6104 const VarDecl* PrevInit = 0; 6105 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6106 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6107 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6108 return; 6109 } 6110 6111 bool IsDependent = false; 6112 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6113 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6114 VDecl->setInvalidDecl(); 6115 return; 6116 } 6117 6118 if (Exprs.get()[I]->isTypeDependent()) 6119 IsDependent = true; 6120 } 6121 6122 // If either the declaration has a dependent type or if any of the 6123 // expressions is type-dependent, we represent the initialization 6124 // via a ParenListExpr for later use during template instantiation. 6125 if (VDecl->getType()->isDependentType() || IsDependent) { 6126 // Let clients know that initialization was done with a direct initializer. 6127 VDecl->setCXXDirectInitializer(true); 6128 6129 // Store the initialization expressions as a ParenListExpr. 6130 unsigned NumExprs = Exprs.size(); 6131 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6132 (Expr **)Exprs.release(), 6133 NumExprs, RParenLoc)); 6134 return; 6135 } 6136 6137 // Capture the variable that is being initialized and the style of 6138 // initialization. 6139 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6140 6141 // FIXME: Poor source location information. 6142 InitializationKind Kind 6143 = InitializationKind::CreateDirect(VDecl->getLocation(), 6144 LParenLoc, RParenLoc); 6145 6146 InitializationSequence InitSeq(*this, Entity, Kind, 6147 Exprs.get(), Exprs.size()); 6148 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6149 if (Result.isInvalid()) { 6150 VDecl->setInvalidDecl(); 6151 return; 6152 } 6153 6154 CheckImplicitConversions(Result.get(), LParenLoc); 6155 6156 Result = MaybeCreateExprWithCleanups(Result); 6157 VDecl->setInit(Result.takeAs<Expr>()); 6158 VDecl->setCXXDirectInitializer(true); 6159 6160 CheckCompleteVariableDeclaration(VDecl); 6161} 6162 6163/// \brief Given a constructor and the set of arguments provided for the 6164/// constructor, convert the arguments and add any required default arguments 6165/// to form a proper call to this constructor. 6166/// 6167/// \returns true if an error occurred, false otherwise. 6168bool 6169Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6170 MultiExprArg ArgsPtr, 6171 SourceLocation Loc, 6172 ASTOwningVector<Expr*> &ConvertedArgs) { 6173 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6174 unsigned NumArgs = ArgsPtr.size(); 6175 Expr **Args = (Expr **)ArgsPtr.get(); 6176 6177 const FunctionProtoType *Proto 6178 = Constructor->getType()->getAs<FunctionProtoType>(); 6179 assert(Proto && "Constructor without a prototype?"); 6180 unsigned NumArgsInProto = Proto->getNumArgs(); 6181 6182 // If too few arguments are available, we'll fill in the rest with defaults. 6183 if (NumArgs < NumArgsInProto) 6184 ConvertedArgs.reserve(NumArgsInProto); 6185 else 6186 ConvertedArgs.reserve(NumArgs); 6187 6188 VariadicCallType CallType = 6189 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6190 llvm::SmallVector<Expr *, 8> AllArgs; 6191 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6192 Proto, 0, Args, NumArgs, AllArgs, 6193 CallType); 6194 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6195 ConvertedArgs.push_back(AllArgs[i]); 6196 return Invalid; 6197} 6198 6199static inline bool 6200CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6201 const FunctionDecl *FnDecl) { 6202 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6203 if (isa<NamespaceDecl>(DC)) { 6204 return SemaRef.Diag(FnDecl->getLocation(), 6205 diag::err_operator_new_delete_declared_in_namespace) 6206 << FnDecl->getDeclName(); 6207 } 6208 6209 if (isa<TranslationUnitDecl>(DC) && 6210 FnDecl->getStorageClass() == SC_Static) { 6211 return SemaRef.Diag(FnDecl->getLocation(), 6212 diag::err_operator_new_delete_declared_static) 6213 << FnDecl->getDeclName(); 6214 } 6215 6216 return false; 6217} 6218 6219static inline bool 6220CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6221 CanQualType ExpectedResultType, 6222 CanQualType ExpectedFirstParamType, 6223 unsigned DependentParamTypeDiag, 6224 unsigned InvalidParamTypeDiag) { 6225 QualType ResultType = 6226 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6227 6228 // Check that the result type is not dependent. 6229 if (ResultType->isDependentType()) 6230 return SemaRef.Diag(FnDecl->getLocation(), 6231 diag::err_operator_new_delete_dependent_result_type) 6232 << FnDecl->getDeclName() << ExpectedResultType; 6233 6234 // Check that the result type is what we expect. 6235 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6236 return SemaRef.Diag(FnDecl->getLocation(), 6237 diag::err_operator_new_delete_invalid_result_type) 6238 << FnDecl->getDeclName() << ExpectedResultType; 6239 6240 // A function template must have at least 2 parameters. 6241 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6242 return SemaRef.Diag(FnDecl->getLocation(), 6243 diag::err_operator_new_delete_template_too_few_parameters) 6244 << FnDecl->getDeclName(); 6245 6246 // The function decl must have at least 1 parameter. 6247 if (FnDecl->getNumParams() == 0) 6248 return SemaRef.Diag(FnDecl->getLocation(), 6249 diag::err_operator_new_delete_too_few_parameters) 6250 << FnDecl->getDeclName(); 6251 6252 // Check the the first parameter type is not dependent. 6253 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6254 if (FirstParamType->isDependentType()) 6255 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6256 << FnDecl->getDeclName() << ExpectedFirstParamType; 6257 6258 // Check that the first parameter type is what we expect. 6259 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6260 ExpectedFirstParamType) 6261 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6262 << FnDecl->getDeclName() << ExpectedFirstParamType; 6263 6264 return false; 6265} 6266 6267static bool 6268CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6269 // C++ [basic.stc.dynamic.allocation]p1: 6270 // A program is ill-formed if an allocation function is declared in a 6271 // namespace scope other than global scope or declared static in global 6272 // scope. 6273 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6274 return true; 6275 6276 CanQualType SizeTy = 6277 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6278 6279 // C++ [basic.stc.dynamic.allocation]p1: 6280 // The return type shall be void*. The first parameter shall have type 6281 // std::size_t. 6282 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6283 SizeTy, 6284 diag::err_operator_new_dependent_param_type, 6285 diag::err_operator_new_param_type)) 6286 return true; 6287 6288 // C++ [basic.stc.dynamic.allocation]p1: 6289 // The first parameter shall not have an associated default argument. 6290 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6291 return SemaRef.Diag(FnDecl->getLocation(), 6292 diag::err_operator_new_default_arg) 6293 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6294 6295 return false; 6296} 6297 6298static bool 6299CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6300 // C++ [basic.stc.dynamic.deallocation]p1: 6301 // A program is ill-formed if deallocation functions are declared in a 6302 // namespace scope other than global scope or declared static in global 6303 // scope. 6304 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6305 return true; 6306 6307 // C++ [basic.stc.dynamic.deallocation]p2: 6308 // Each deallocation function shall return void and its first parameter 6309 // shall be void*. 6310 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6311 SemaRef.Context.VoidPtrTy, 6312 diag::err_operator_delete_dependent_param_type, 6313 diag::err_operator_delete_param_type)) 6314 return true; 6315 6316 return false; 6317} 6318 6319/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6320/// of this overloaded operator is well-formed. If so, returns false; 6321/// otherwise, emits appropriate diagnostics and returns true. 6322bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6323 assert(FnDecl && FnDecl->isOverloadedOperator() && 6324 "Expected an overloaded operator declaration"); 6325 6326 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6327 6328 // C++ [over.oper]p5: 6329 // The allocation and deallocation functions, operator new, 6330 // operator new[], operator delete and operator delete[], are 6331 // described completely in 3.7.3. The attributes and restrictions 6332 // found in the rest of this subclause do not apply to them unless 6333 // explicitly stated in 3.7.3. 6334 if (Op == OO_Delete || Op == OO_Array_Delete) 6335 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6336 6337 if (Op == OO_New || Op == OO_Array_New) 6338 return CheckOperatorNewDeclaration(*this, FnDecl); 6339 6340 // C++ [over.oper]p6: 6341 // An operator function shall either be a non-static member 6342 // function or be a non-member function and have at least one 6343 // parameter whose type is a class, a reference to a class, an 6344 // enumeration, or a reference to an enumeration. 6345 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6346 if (MethodDecl->isStatic()) 6347 return Diag(FnDecl->getLocation(), 6348 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6349 } else { 6350 bool ClassOrEnumParam = false; 6351 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6352 ParamEnd = FnDecl->param_end(); 6353 Param != ParamEnd; ++Param) { 6354 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6355 if (ParamType->isDependentType() || ParamType->isRecordType() || 6356 ParamType->isEnumeralType()) { 6357 ClassOrEnumParam = true; 6358 break; 6359 } 6360 } 6361 6362 if (!ClassOrEnumParam) 6363 return Diag(FnDecl->getLocation(), 6364 diag::err_operator_overload_needs_class_or_enum) 6365 << FnDecl->getDeclName(); 6366 } 6367 6368 // C++ [over.oper]p8: 6369 // An operator function cannot have default arguments (8.3.6), 6370 // except where explicitly stated below. 6371 // 6372 // Only the function-call operator allows default arguments 6373 // (C++ [over.call]p1). 6374 if (Op != OO_Call) { 6375 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6376 Param != FnDecl->param_end(); ++Param) { 6377 if ((*Param)->hasDefaultArg()) 6378 return Diag((*Param)->getLocation(), 6379 diag::err_operator_overload_default_arg) 6380 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6381 } 6382 } 6383 6384 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6385 { false, false, false } 6386#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6387 , { Unary, Binary, MemberOnly } 6388#include "clang/Basic/OperatorKinds.def" 6389 }; 6390 6391 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6392 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6393 bool MustBeMemberOperator = OperatorUses[Op][2]; 6394 6395 // C++ [over.oper]p8: 6396 // [...] Operator functions cannot have more or fewer parameters 6397 // than the number required for the corresponding operator, as 6398 // described in the rest of this subclause. 6399 unsigned NumParams = FnDecl->getNumParams() 6400 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6401 if (Op != OO_Call && 6402 ((NumParams == 1 && !CanBeUnaryOperator) || 6403 (NumParams == 2 && !CanBeBinaryOperator) || 6404 (NumParams < 1) || (NumParams > 2))) { 6405 // We have the wrong number of parameters. 6406 unsigned ErrorKind; 6407 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6408 ErrorKind = 2; // 2 -> unary or binary. 6409 } else if (CanBeUnaryOperator) { 6410 ErrorKind = 0; // 0 -> unary 6411 } else { 6412 assert(CanBeBinaryOperator && 6413 "All non-call overloaded operators are unary or binary!"); 6414 ErrorKind = 1; // 1 -> binary 6415 } 6416 6417 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6418 << FnDecl->getDeclName() << NumParams << ErrorKind; 6419 } 6420 6421 // Overloaded operators other than operator() cannot be variadic. 6422 if (Op != OO_Call && 6423 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6424 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6425 << FnDecl->getDeclName(); 6426 } 6427 6428 // Some operators must be non-static member functions. 6429 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6430 return Diag(FnDecl->getLocation(), 6431 diag::err_operator_overload_must_be_member) 6432 << FnDecl->getDeclName(); 6433 } 6434 6435 // C++ [over.inc]p1: 6436 // The user-defined function called operator++ implements the 6437 // prefix and postfix ++ operator. If this function is a member 6438 // function with no parameters, or a non-member function with one 6439 // parameter of class or enumeration type, it defines the prefix 6440 // increment operator ++ for objects of that type. If the function 6441 // is a member function with one parameter (which shall be of type 6442 // int) or a non-member function with two parameters (the second 6443 // of which shall be of type int), it defines the postfix 6444 // increment operator ++ for objects of that type. 6445 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6446 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6447 bool ParamIsInt = false; 6448 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6449 ParamIsInt = BT->getKind() == BuiltinType::Int; 6450 6451 if (!ParamIsInt) 6452 return Diag(LastParam->getLocation(), 6453 diag::err_operator_overload_post_incdec_must_be_int) 6454 << LastParam->getType() << (Op == OO_MinusMinus); 6455 } 6456 6457 return false; 6458} 6459 6460/// CheckLiteralOperatorDeclaration - Check whether the declaration 6461/// of this literal operator function is well-formed. If so, returns 6462/// false; otherwise, emits appropriate diagnostics and returns true. 6463bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6464 DeclContext *DC = FnDecl->getDeclContext(); 6465 Decl::Kind Kind = DC->getDeclKind(); 6466 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6467 Kind != Decl::LinkageSpec) { 6468 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6469 << FnDecl->getDeclName(); 6470 return true; 6471 } 6472 6473 bool Valid = false; 6474 6475 // template <char...> type operator "" name() is the only valid template 6476 // signature, and the only valid signature with no parameters. 6477 if (FnDecl->param_size() == 0) { 6478 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6479 // Must have only one template parameter 6480 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6481 if (Params->size() == 1) { 6482 NonTypeTemplateParmDecl *PmDecl = 6483 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6484 6485 // The template parameter must be a char parameter pack. 6486 if (PmDecl && PmDecl->isTemplateParameterPack() && 6487 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6488 Valid = true; 6489 } 6490 } 6491 } else { 6492 // Check the first parameter 6493 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6494 6495 QualType T = (*Param)->getType(); 6496 6497 // unsigned long long int, long double, and any character type are allowed 6498 // as the only parameters. 6499 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6500 Context.hasSameType(T, Context.LongDoubleTy) || 6501 Context.hasSameType(T, Context.CharTy) || 6502 Context.hasSameType(T, Context.WCharTy) || 6503 Context.hasSameType(T, Context.Char16Ty) || 6504 Context.hasSameType(T, Context.Char32Ty)) { 6505 if (++Param == FnDecl->param_end()) 6506 Valid = true; 6507 goto FinishedParams; 6508 } 6509 6510 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6511 const PointerType *PT = T->getAs<PointerType>(); 6512 if (!PT) 6513 goto FinishedParams; 6514 T = PT->getPointeeType(); 6515 if (!T.isConstQualified()) 6516 goto FinishedParams; 6517 T = T.getUnqualifiedType(); 6518 6519 // Move on to the second parameter; 6520 ++Param; 6521 6522 // If there is no second parameter, the first must be a const char * 6523 if (Param == FnDecl->param_end()) { 6524 if (Context.hasSameType(T, Context.CharTy)) 6525 Valid = true; 6526 goto FinishedParams; 6527 } 6528 6529 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6530 // are allowed as the first parameter to a two-parameter function 6531 if (!(Context.hasSameType(T, Context.CharTy) || 6532 Context.hasSameType(T, Context.WCharTy) || 6533 Context.hasSameType(T, Context.Char16Ty) || 6534 Context.hasSameType(T, Context.Char32Ty))) 6535 goto FinishedParams; 6536 6537 // The second and final parameter must be an std::size_t 6538 T = (*Param)->getType().getUnqualifiedType(); 6539 if (Context.hasSameType(T, Context.getSizeType()) && 6540 ++Param == FnDecl->param_end()) 6541 Valid = true; 6542 } 6543 6544 // FIXME: This diagnostic is absolutely terrible. 6545FinishedParams: 6546 if (!Valid) { 6547 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6548 << FnDecl->getDeclName(); 6549 return true; 6550 } 6551 6552 return false; 6553} 6554 6555/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6556/// linkage specification, including the language and (if present) 6557/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6558/// the location of the language string literal, which is provided 6559/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6560/// the '{' brace. Otherwise, this linkage specification does not 6561/// have any braces. 6562Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6563 SourceLocation LangLoc, 6564 llvm::StringRef Lang, 6565 SourceLocation LBraceLoc) { 6566 LinkageSpecDecl::LanguageIDs Language; 6567 if (Lang == "\"C\"") 6568 Language = LinkageSpecDecl::lang_c; 6569 else if (Lang == "\"C++\"") 6570 Language = LinkageSpecDecl::lang_cxx; 6571 else { 6572 Diag(LangLoc, diag::err_bad_language); 6573 return 0; 6574 } 6575 6576 // FIXME: Add all the various semantics of linkage specifications 6577 6578 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6579 LangLoc, Language, 6580 LBraceLoc.isValid()); 6581 CurContext->addDecl(D); 6582 PushDeclContext(S, D); 6583 return D; 6584} 6585 6586/// ActOnFinishLinkageSpecification - Complete the definition of 6587/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6588/// valid, it's the position of the closing '}' brace in a linkage 6589/// specification that uses braces. 6590Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6591 Decl *LinkageSpec, 6592 SourceLocation RBraceLoc) { 6593 if (LinkageSpec) 6594 PopDeclContext(); 6595 return LinkageSpec; 6596} 6597 6598/// \brief Perform semantic analysis for the variable declaration that 6599/// occurs within a C++ catch clause, returning the newly-created 6600/// variable. 6601VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6602 TypeSourceInfo *TInfo, 6603 IdentifierInfo *Name, 6604 SourceLocation Loc) { 6605 bool Invalid = false; 6606 QualType ExDeclType = TInfo->getType(); 6607 6608 // Arrays and functions decay. 6609 if (ExDeclType->isArrayType()) 6610 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6611 else if (ExDeclType->isFunctionType()) 6612 ExDeclType = Context.getPointerType(ExDeclType); 6613 6614 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6615 // The exception-declaration shall not denote a pointer or reference to an 6616 // incomplete type, other than [cv] void*. 6617 // N2844 forbids rvalue references. 6618 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6619 Diag(Loc, diag::err_catch_rvalue_ref); 6620 Invalid = true; 6621 } 6622 6623 // GCC allows catching pointers and references to incomplete types 6624 // as an extension; so do we, but we warn by default. 6625 6626 QualType BaseType = ExDeclType; 6627 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6628 unsigned DK = diag::err_catch_incomplete; 6629 bool IncompleteCatchIsInvalid = true; 6630 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6631 BaseType = Ptr->getPointeeType(); 6632 Mode = 1; 6633 DK = diag::ext_catch_incomplete_ptr; 6634 IncompleteCatchIsInvalid = false; 6635 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6636 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6637 BaseType = Ref->getPointeeType(); 6638 Mode = 2; 6639 DK = diag::ext_catch_incomplete_ref; 6640 IncompleteCatchIsInvalid = false; 6641 } 6642 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6643 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6644 IncompleteCatchIsInvalid) 6645 Invalid = true; 6646 6647 if (!Invalid && !ExDeclType->isDependentType() && 6648 RequireNonAbstractType(Loc, ExDeclType, 6649 diag::err_abstract_type_in_decl, 6650 AbstractVariableType)) 6651 Invalid = true; 6652 6653 // Only the non-fragile NeXT runtime currently supports C++ catches 6654 // of ObjC types, and no runtime supports catching ObjC types by value. 6655 if (!Invalid && getLangOptions().ObjC1) { 6656 QualType T = ExDeclType; 6657 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6658 T = RT->getPointeeType(); 6659 6660 if (T->isObjCObjectType()) { 6661 Diag(Loc, diag::err_objc_object_catch); 6662 Invalid = true; 6663 } else if (T->isObjCObjectPointerType()) { 6664 if (!getLangOptions().NeXTRuntime) { 6665 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6666 Invalid = true; 6667 } else if (!getLangOptions().ObjCNonFragileABI) { 6668 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6669 Invalid = true; 6670 } 6671 } 6672 } 6673 6674 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6675 Name, ExDeclType, TInfo, SC_None, 6676 SC_None); 6677 ExDecl->setExceptionVariable(true); 6678 6679 if (!Invalid) { 6680 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6681 // C++ [except.handle]p16: 6682 // The object declared in an exception-declaration or, if the 6683 // exception-declaration does not specify a name, a temporary (12.2) is 6684 // copy-initialized (8.5) from the exception object. [...] 6685 // The object is destroyed when the handler exits, after the destruction 6686 // of any automatic objects initialized within the handler. 6687 // 6688 // We just pretend to initialize the object with itself, then make sure 6689 // it can be destroyed later. 6690 QualType initType = ExDeclType; 6691 6692 InitializedEntity entity = 6693 InitializedEntity::InitializeVariable(ExDecl); 6694 InitializationKind initKind = 6695 InitializationKind::CreateCopy(Loc, SourceLocation()); 6696 6697 Expr *opaqueValue = 6698 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6699 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6700 ExprResult result = sequence.Perform(*this, entity, initKind, 6701 MultiExprArg(&opaqueValue, 1)); 6702 if (result.isInvalid()) 6703 Invalid = true; 6704 else { 6705 // If the constructor used was non-trivial, set this as the 6706 // "initializer". 6707 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6708 if (!construct->getConstructor()->isTrivial()) { 6709 Expr *init = MaybeCreateExprWithCleanups(construct); 6710 ExDecl->setInit(init); 6711 } 6712 6713 // And make sure it's destructable. 6714 FinalizeVarWithDestructor(ExDecl, recordType); 6715 } 6716 } 6717 } 6718 6719 if (Invalid) 6720 ExDecl->setInvalidDecl(); 6721 6722 return ExDecl; 6723} 6724 6725/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6726/// handler. 6727Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6728 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6729 bool Invalid = D.isInvalidType(); 6730 6731 // Check for unexpanded parameter packs. 6732 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6733 UPPC_ExceptionType)) { 6734 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6735 D.getIdentifierLoc()); 6736 Invalid = true; 6737 } 6738 6739 IdentifierInfo *II = D.getIdentifier(); 6740 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6741 LookupOrdinaryName, 6742 ForRedeclaration)) { 6743 // The scope should be freshly made just for us. There is just no way 6744 // it contains any previous declaration. 6745 assert(!S->isDeclScope(PrevDecl)); 6746 if (PrevDecl->isTemplateParameter()) { 6747 // Maybe we will complain about the shadowed template parameter. 6748 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6749 } 6750 } 6751 6752 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6753 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6754 << D.getCXXScopeSpec().getRange(); 6755 Invalid = true; 6756 } 6757 6758 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6759 D.getIdentifier(), 6760 D.getIdentifierLoc()); 6761 6762 if (Invalid) 6763 ExDecl->setInvalidDecl(); 6764 6765 // Add the exception declaration into this scope. 6766 if (II) 6767 PushOnScopeChains(ExDecl, S); 6768 else 6769 CurContext->addDecl(ExDecl); 6770 6771 ProcessDeclAttributes(S, ExDecl, D); 6772 return ExDecl; 6773} 6774 6775Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6776 Expr *AssertExpr, 6777 Expr *AssertMessageExpr_) { 6778 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6779 6780 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6781 llvm::APSInt Value(32); 6782 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6783 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6784 AssertExpr->getSourceRange(); 6785 return 0; 6786 } 6787 6788 if (Value == 0) { 6789 Diag(AssertLoc, diag::err_static_assert_failed) 6790 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6791 } 6792 } 6793 6794 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6795 return 0; 6796 6797 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6798 AssertExpr, AssertMessage); 6799 6800 CurContext->addDecl(Decl); 6801 return Decl; 6802} 6803 6804/// \brief Perform semantic analysis of the given friend type declaration. 6805/// 6806/// \returns A friend declaration that. 6807FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6808 TypeSourceInfo *TSInfo) { 6809 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6810 6811 QualType T = TSInfo->getType(); 6812 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6813 6814 if (!getLangOptions().CPlusPlus0x) { 6815 // C++03 [class.friend]p2: 6816 // An elaborated-type-specifier shall be used in a friend declaration 6817 // for a class.* 6818 // 6819 // * The class-key of the elaborated-type-specifier is required. 6820 if (!ActiveTemplateInstantiations.empty()) { 6821 // Do not complain about the form of friend template types during 6822 // template instantiation; we will already have complained when the 6823 // template was declared. 6824 } else if (!T->isElaboratedTypeSpecifier()) { 6825 // If we evaluated the type to a record type, suggest putting 6826 // a tag in front. 6827 if (const RecordType *RT = T->getAs<RecordType>()) { 6828 RecordDecl *RD = RT->getDecl(); 6829 6830 std::string InsertionText = std::string(" ") + RD->getKindName(); 6831 6832 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6833 << (unsigned) RD->getTagKind() 6834 << T 6835 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6836 InsertionText); 6837 } else { 6838 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6839 << T 6840 << SourceRange(FriendLoc, TypeRange.getEnd()); 6841 } 6842 } else if (T->getAs<EnumType>()) { 6843 Diag(FriendLoc, diag::ext_enum_friend) 6844 << T 6845 << SourceRange(FriendLoc, TypeRange.getEnd()); 6846 } 6847 } 6848 6849 // C++0x [class.friend]p3: 6850 // If the type specifier in a friend declaration designates a (possibly 6851 // cv-qualified) class type, that class is declared as a friend; otherwise, 6852 // the friend declaration is ignored. 6853 6854 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6855 // in [class.friend]p3 that we do not implement. 6856 6857 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6858} 6859 6860/// Handle a friend tag declaration where the scope specifier was 6861/// templated. 6862Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6863 unsigned TagSpec, SourceLocation TagLoc, 6864 CXXScopeSpec &SS, 6865 IdentifierInfo *Name, SourceLocation NameLoc, 6866 AttributeList *Attr, 6867 MultiTemplateParamsArg TempParamLists) { 6868 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6869 6870 bool isExplicitSpecialization = false; 6871 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6872 bool Invalid = false; 6873 6874 if (TemplateParameterList *TemplateParams 6875 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6876 TempParamLists.get(), 6877 TempParamLists.size(), 6878 /*friend*/ true, 6879 isExplicitSpecialization, 6880 Invalid)) { 6881 --NumMatchedTemplateParamLists; 6882 6883 if (TemplateParams->size() > 0) { 6884 // This is a declaration of a class template. 6885 if (Invalid) 6886 return 0; 6887 6888 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6889 SS, Name, NameLoc, Attr, 6890 TemplateParams, AS_public).take(); 6891 } else { 6892 // The "template<>" header is extraneous. 6893 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6894 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6895 isExplicitSpecialization = true; 6896 } 6897 } 6898 6899 if (Invalid) return 0; 6900 6901 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6902 6903 bool isAllExplicitSpecializations = true; 6904 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6905 if (TempParamLists.get()[I]->size()) { 6906 isAllExplicitSpecializations = false; 6907 break; 6908 } 6909 } 6910 6911 // FIXME: don't ignore attributes. 6912 6913 // If it's explicit specializations all the way down, just forget 6914 // about the template header and build an appropriate non-templated 6915 // friend. TODO: for source fidelity, remember the headers. 6916 if (isAllExplicitSpecializations) { 6917 ElaboratedTypeKeyword Keyword 6918 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6919 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6920 TagLoc, SS.getRange(), NameLoc); 6921 if (T.isNull()) 6922 return 0; 6923 6924 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6925 if (isa<DependentNameType>(T)) { 6926 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6927 TL.setKeywordLoc(TagLoc); 6928 TL.setQualifierRange(SS.getRange()); 6929 TL.setNameLoc(NameLoc); 6930 } else { 6931 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6932 TL.setKeywordLoc(TagLoc); 6933 TL.setQualifierRange(SS.getRange()); 6934 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6935 } 6936 6937 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6938 TSI, FriendLoc); 6939 Friend->setAccess(AS_public); 6940 CurContext->addDecl(Friend); 6941 return Friend; 6942 } 6943 6944 // Handle the case of a templated-scope friend class. e.g. 6945 // template <class T> class A<T>::B; 6946 // FIXME: we don't support these right now. 6947 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6948 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6949 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6950 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6951 TL.setKeywordLoc(TagLoc); 6952 TL.setQualifierRange(SS.getRange()); 6953 TL.setNameLoc(NameLoc); 6954 6955 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6956 TSI, FriendLoc); 6957 Friend->setAccess(AS_public); 6958 Friend->setUnsupportedFriend(true); 6959 CurContext->addDecl(Friend); 6960 return Friend; 6961} 6962 6963 6964/// Handle a friend type declaration. This works in tandem with 6965/// ActOnTag. 6966/// 6967/// Notes on friend class templates: 6968/// 6969/// We generally treat friend class declarations as if they were 6970/// declaring a class. So, for example, the elaborated type specifier 6971/// in a friend declaration is required to obey the restrictions of a 6972/// class-head (i.e. no typedefs in the scope chain), template 6973/// parameters are required to match up with simple template-ids, &c. 6974/// However, unlike when declaring a template specialization, it's 6975/// okay to refer to a template specialization without an empty 6976/// template parameter declaration, e.g. 6977/// friend class A<T>::B<unsigned>; 6978/// We permit this as a special case; if there are any template 6979/// parameters present at all, require proper matching, i.e. 6980/// template <> template <class T> friend class A<int>::B; 6981Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6982 MultiTemplateParamsArg TempParams) { 6983 SourceLocation Loc = DS.getSourceRange().getBegin(); 6984 6985 assert(DS.isFriendSpecified()); 6986 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6987 6988 // Try to convert the decl specifier to a type. This works for 6989 // friend templates because ActOnTag never produces a ClassTemplateDecl 6990 // for a TUK_Friend. 6991 Declarator TheDeclarator(DS, Declarator::MemberContext); 6992 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6993 QualType T = TSI->getType(); 6994 if (TheDeclarator.isInvalidType()) 6995 return 0; 6996 6997 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6998 return 0; 6999 7000 // This is definitely an error in C++98. It's probably meant to 7001 // be forbidden in C++0x, too, but the specification is just 7002 // poorly written. 7003 // 7004 // The problem is with declarations like the following: 7005 // template <T> friend A<T>::foo; 7006 // where deciding whether a class C is a friend or not now hinges 7007 // on whether there exists an instantiation of A that causes 7008 // 'foo' to equal C. There are restrictions on class-heads 7009 // (which we declare (by fiat) elaborated friend declarations to 7010 // be) that makes this tractable. 7011 // 7012 // FIXME: handle "template <> friend class A<T>;", which 7013 // is possibly well-formed? Who even knows? 7014 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7015 Diag(Loc, diag::err_tagless_friend_type_template) 7016 << DS.getSourceRange(); 7017 return 0; 7018 } 7019 7020 // C++98 [class.friend]p1: A friend of a class is a function 7021 // or class that is not a member of the class . . . 7022 // This is fixed in DR77, which just barely didn't make the C++03 7023 // deadline. It's also a very silly restriction that seriously 7024 // affects inner classes and which nobody else seems to implement; 7025 // thus we never diagnose it, not even in -pedantic. 7026 // 7027 // But note that we could warn about it: it's always useless to 7028 // friend one of your own members (it's not, however, worthless to 7029 // friend a member of an arbitrary specialization of your template). 7030 7031 Decl *D; 7032 if (unsigned NumTempParamLists = TempParams.size()) 7033 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7034 NumTempParamLists, 7035 TempParams.release(), 7036 TSI, 7037 DS.getFriendSpecLoc()); 7038 else 7039 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7040 7041 if (!D) 7042 return 0; 7043 7044 D->setAccess(AS_public); 7045 CurContext->addDecl(D); 7046 7047 return D; 7048} 7049 7050Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7051 MultiTemplateParamsArg TemplateParams) { 7052 const DeclSpec &DS = D.getDeclSpec(); 7053 7054 assert(DS.isFriendSpecified()); 7055 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7056 7057 SourceLocation Loc = D.getIdentifierLoc(); 7058 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7059 QualType T = TInfo->getType(); 7060 7061 // C++ [class.friend]p1 7062 // A friend of a class is a function or class.... 7063 // Note that this sees through typedefs, which is intended. 7064 // It *doesn't* see through dependent types, which is correct 7065 // according to [temp.arg.type]p3: 7066 // If a declaration acquires a function type through a 7067 // type dependent on a template-parameter and this causes 7068 // a declaration that does not use the syntactic form of a 7069 // function declarator to have a function type, the program 7070 // is ill-formed. 7071 if (!T->isFunctionType()) { 7072 Diag(Loc, diag::err_unexpected_friend); 7073 7074 // It might be worthwhile to try to recover by creating an 7075 // appropriate declaration. 7076 return 0; 7077 } 7078 7079 // C++ [namespace.memdef]p3 7080 // - If a friend declaration in a non-local class first declares a 7081 // class or function, the friend class or function is a member 7082 // of the innermost enclosing namespace. 7083 // - The name of the friend is not found by simple name lookup 7084 // until a matching declaration is provided in that namespace 7085 // scope (either before or after the class declaration granting 7086 // friendship). 7087 // - If a friend function is called, its name may be found by the 7088 // name lookup that considers functions from namespaces and 7089 // classes associated with the types of the function arguments. 7090 // - When looking for a prior declaration of a class or a function 7091 // declared as a friend, scopes outside the innermost enclosing 7092 // namespace scope are not considered. 7093 7094 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7095 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7096 DeclarationName Name = NameInfo.getName(); 7097 assert(Name); 7098 7099 // Check for unexpanded parameter packs. 7100 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7101 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7102 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7103 return 0; 7104 7105 // The context we found the declaration in, or in which we should 7106 // create the declaration. 7107 DeclContext *DC; 7108 Scope *DCScope = S; 7109 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7110 ForRedeclaration); 7111 7112 // FIXME: there are different rules in local classes 7113 7114 // There are four cases here. 7115 // - There's no scope specifier, in which case we just go to the 7116 // appropriate scope and look for a function or function template 7117 // there as appropriate. 7118 // Recover from invalid scope qualifiers as if they just weren't there. 7119 if (SS.isInvalid() || !SS.isSet()) { 7120 // C++0x [namespace.memdef]p3: 7121 // If the name in a friend declaration is neither qualified nor 7122 // a template-id and the declaration is a function or an 7123 // elaborated-type-specifier, the lookup to determine whether 7124 // the entity has been previously declared shall not consider 7125 // any scopes outside the innermost enclosing namespace. 7126 // C++0x [class.friend]p11: 7127 // If a friend declaration appears in a local class and the name 7128 // specified is an unqualified name, a prior declaration is 7129 // looked up without considering scopes that are outside the 7130 // innermost enclosing non-class scope. For a friend function 7131 // declaration, if there is no prior declaration, the program is 7132 // ill-formed. 7133 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7134 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7135 7136 // Find the appropriate context according to the above. 7137 DC = CurContext; 7138 while (true) { 7139 // Skip class contexts. If someone can cite chapter and verse 7140 // for this behavior, that would be nice --- it's what GCC and 7141 // EDG do, and it seems like a reasonable intent, but the spec 7142 // really only says that checks for unqualified existing 7143 // declarations should stop at the nearest enclosing namespace, 7144 // not that they should only consider the nearest enclosing 7145 // namespace. 7146 while (DC->isRecord()) 7147 DC = DC->getParent(); 7148 7149 LookupQualifiedName(Previous, DC); 7150 7151 // TODO: decide what we think about using declarations. 7152 if (isLocal || !Previous.empty()) 7153 break; 7154 7155 if (isTemplateId) { 7156 if (isa<TranslationUnitDecl>(DC)) break; 7157 } else { 7158 if (DC->isFileContext()) break; 7159 } 7160 DC = DC->getParent(); 7161 } 7162 7163 // C++ [class.friend]p1: A friend of a class is a function or 7164 // class that is not a member of the class . . . 7165 // C++0x changes this for both friend types and functions. 7166 // Most C++ 98 compilers do seem to give an error here, so 7167 // we do, too. 7168 if (!Previous.empty() && DC->Equals(CurContext) 7169 && !getLangOptions().CPlusPlus0x) 7170 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7171 7172 DCScope = getScopeForDeclContext(S, DC); 7173 7174 // - There's a non-dependent scope specifier, in which case we 7175 // compute it and do a previous lookup there for a function 7176 // or function template. 7177 } else if (!SS.getScopeRep()->isDependent()) { 7178 DC = computeDeclContext(SS); 7179 if (!DC) return 0; 7180 7181 if (RequireCompleteDeclContext(SS, DC)) return 0; 7182 7183 LookupQualifiedName(Previous, DC); 7184 7185 // Ignore things found implicitly in the wrong scope. 7186 // TODO: better diagnostics for this case. Suggesting the right 7187 // qualified scope would be nice... 7188 LookupResult::Filter F = Previous.makeFilter(); 7189 while (F.hasNext()) { 7190 NamedDecl *D = F.next(); 7191 if (!DC->InEnclosingNamespaceSetOf( 7192 D->getDeclContext()->getRedeclContext())) 7193 F.erase(); 7194 } 7195 F.done(); 7196 7197 if (Previous.empty()) { 7198 D.setInvalidType(); 7199 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7200 return 0; 7201 } 7202 7203 // C++ [class.friend]p1: A friend of a class is a function or 7204 // class that is not a member of the class . . . 7205 if (DC->Equals(CurContext)) 7206 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7207 7208 // - There's a scope specifier that does not match any template 7209 // parameter lists, in which case we use some arbitrary context, 7210 // create a method or method template, and wait for instantiation. 7211 // - There's a scope specifier that does match some template 7212 // parameter lists, which we don't handle right now. 7213 } else { 7214 DC = CurContext; 7215 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7216 } 7217 7218 if (!DC->isRecord()) { 7219 // This implies that it has to be an operator or function. 7220 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7221 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7222 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7223 Diag(Loc, diag::err_introducing_special_friend) << 7224 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7225 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7226 return 0; 7227 } 7228 } 7229 7230 bool Redeclaration = false; 7231 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7232 move(TemplateParams), 7233 IsDefinition, 7234 Redeclaration); 7235 if (!ND) return 0; 7236 7237 assert(ND->getDeclContext() == DC); 7238 assert(ND->getLexicalDeclContext() == CurContext); 7239 7240 // Add the function declaration to the appropriate lookup tables, 7241 // adjusting the redeclarations list as necessary. We don't 7242 // want to do this yet if the friending class is dependent. 7243 // 7244 // Also update the scope-based lookup if the target context's 7245 // lookup context is in lexical scope. 7246 if (!CurContext->isDependentContext()) { 7247 DC = DC->getRedeclContext(); 7248 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7249 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7250 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7251 } 7252 7253 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7254 D.getIdentifierLoc(), ND, 7255 DS.getFriendSpecLoc()); 7256 FrD->setAccess(AS_public); 7257 CurContext->addDecl(FrD); 7258 7259 if (ND->isInvalidDecl()) 7260 FrD->setInvalidDecl(); 7261 else { 7262 FunctionDecl *FD; 7263 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7264 FD = FTD->getTemplatedDecl(); 7265 else 7266 FD = cast<FunctionDecl>(ND); 7267 7268 // Mark templated-scope function declarations as unsupported. 7269 if (FD->getNumTemplateParameterLists()) 7270 FrD->setUnsupportedFriend(true); 7271 } 7272 7273 return ND; 7274} 7275 7276void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7277 AdjustDeclIfTemplate(Dcl); 7278 7279 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7280 if (!Fn) { 7281 Diag(DelLoc, diag::err_deleted_non_function); 7282 return; 7283 } 7284 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7285 Diag(DelLoc, diag::err_deleted_decl_not_first); 7286 Diag(Prev->getLocation(), diag::note_previous_declaration); 7287 // If the declaration wasn't the first, we delete the function anyway for 7288 // recovery. 7289 } 7290 Fn->setDeleted(); 7291} 7292 7293static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7294 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7295 Stmt *SubStmt = *CI; 7296 if (!SubStmt) 7297 continue; 7298 if (isa<ReturnStmt>(SubStmt)) 7299 Self.Diag(SubStmt->getSourceRange().getBegin(), 7300 diag::err_return_in_constructor_handler); 7301 if (!isa<Expr>(SubStmt)) 7302 SearchForReturnInStmt(Self, SubStmt); 7303 } 7304} 7305 7306void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7307 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7308 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7309 SearchForReturnInStmt(*this, Handler); 7310 } 7311} 7312 7313bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7314 const CXXMethodDecl *Old) { 7315 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7316 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7317 7318 if (Context.hasSameType(NewTy, OldTy) || 7319 NewTy->isDependentType() || OldTy->isDependentType()) 7320 return false; 7321 7322 // Check if the return types are covariant 7323 QualType NewClassTy, OldClassTy; 7324 7325 /// Both types must be pointers or references to classes. 7326 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7327 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7328 NewClassTy = NewPT->getPointeeType(); 7329 OldClassTy = OldPT->getPointeeType(); 7330 } 7331 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7332 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7333 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7334 NewClassTy = NewRT->getPointeeType(); 7335 OldClassTy = OldRT->getPointeeType(); 7336 } 7337 } 7338 } 7339 7340 // The return types aren't either both pointers or references to a class type. 7341 if (NewClassTy.isNull()) { 7342 Diag(New->getLocation(), 7343 diag::err_different_return_type_for_overriding_virtual_function) 7344 << New->getDeclName() << NewTy << OldTy; 7345 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7346 7347 return true; 7348 } 7349 7350 // C++ [class.virtual]p6: 7351 // If the return type of D::f differs from the return type of B::f, the 7352 // class type in the return type of D::f shall be complete at the point of 7353 // declaration of D::f or shall be the class type D. 7354 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7355 if (!RT->isBeingDefined() && 7356 RequireCompleteType(New->getLocation(), NewClassTy, 7357 PDiag(diag::err_covariant_return_incomplete) 7358 << New->getDeclName())) 7359 return true; 7360 } 7361 7362 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7363 // Check if the new class derives from the old class. 7364 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7365 Diag(New->getLocation(), 7366 diag::err_covariant_return_not_derived) 7367 << New->getDeclName() << NewTy << OldTy; 7368 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7369 return true; 7370 } 7371 7372 // Check if we the conversion from derived to base is valid. 7373 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7374 diag::err_covariant_return_inaccessible_base, 7375 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7376 // FIXME: Should this point to the return type? 7377 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7378 // FIXME: this note won't trigger for delayed access control 7379 // diagnostics, and it's impossible to get an undelayed error 7380 // here from access control during the original parse because 7381 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7382 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7383 return true; 7384 } 7385 } 7386 7387 // The qualifiers of the return types must be the same. 7388 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7389 Diag(New->getLocation(), 7390 diag::err_covariant_return_type_different_qualifications) 7391 << New->getDeclName() << NewTy << OldTy; 7392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7393 return true; 7394 }; 7395 7396 7397 // The new class type must have the same or less qualifiers as the old type. 7398 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7399 Diag(New->getLocation(), 7400 diag::err_covariant_return_type_class_type_more_qualified) 7401 << New->getDeclName() << NewTy << OldTy; 7402 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7403 return true; 7404 }; 7405 7406 return false; 7407} 7408 7409/// \brief Mark the given method pure. 7410/// 7411/// \param Method the method to be marked pure. 7412/// 7413/// \param InitRange the source range that covers the "0" initializer. 7414bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7415 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7416 Method->setPure(); 7417 return false; 7418 } 7419 7420 if (!Method->isInvalidDecl()) 7421 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7422 << Method->getDeclName() << InitRange; 7423 return true; 7424} 7425 7426/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7427/// an initializer for the out-of-line declaration 'Dcl'. The scope 7428/// is a fresh scope pushed for just this purpose. 7429/// 7430/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7431/// static data member of class X, names should be looked up in the scope of 7432/// class X. 7433void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7434 // If there is no declaration, there was an error parsing it. 7435 if (D == 0) return; 7436 7437 // We should only get called for declarations with scope specifiers, like: 7438 // int foo::bar; 7439 assert(D->isOutOfLine()); 7440 EnterDeclaratorContext(S, D->getDeclContext()); 7441} 7442 7443/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7444/// initializer for the out-of-line declaration 'D'. 7445void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7446 // If there is no declaration, there was an error parsing it. 7447 if (D == 0) return; 7448 7449 assert(D->isOutOfLine()); 7450 ExitDeclaratorContext(S); 7451} 7452 7453/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7454/// C++ if/switch/while/for statement. 7455/// e.g: "if (int x = f()) {...}" 7456DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7457 // C++ 6.4p2: 7458 // The declarator shall not specify a function or an array. 7459 // The type-specifier-seq shall not contain typedef and shall not declare a 7460 // new class or enumeration. 7461 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7462 "Parser allowed 'typedef' as storage class of condition decl."); 7463 7464 TagDecl *OwnedTag = 0; 7465 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7466 QualType Ty = TInfo->getType(); 7467 7468 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7469 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7470 // would be created and CXXConditionDeclExpr wants a VarDecl. 7471 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7472 << D.getSourceRange(); 7473 return DeclResult(); 7474 } else if (OwnedTag && OwnedTag->isDefinition()) { 7475 // The type-specifier-seq shall not declare a new class or enumeration. 7476 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7477 } 7478 7479 Decl *Dcl = ActOnDeclarator(S, D); 7480 if (!Dcl) 7481 return DeclResult(); 7482 7483 return Dcl; 7484} 7485 7486void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7487 bool DefinitionRequired) { 7488 // Ignore any vtable uses in unevaluated operands or for classes that do 7489 // not have a vtable. 7490 if (!Class->isDynamicClass() || Class->isDependentContext() || 7491 CurContext->isDependentContext() || 7492 ExprEvalContexts.back().Context == Unevaluated) 7493 return; 7494 7495 // Try to insert this class into the map. 7496 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7497 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7498 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7499 if (!Pos.second) { 7500 // If we already had an entry, check to see if we are promoting this vtable 7501 // to required a definition. If so, we need to reappend to the VTableUses 7502 // list, since we may have already processed the first entry. 7503 if (DefinitionRequired && !Pos.first->second) { 7504 Pos.first->second = true; 7505 } else { 7506 // Otherwise, we can early exit. 7507 return; 7508 } 7509 } 7510 7511 // Local classes need to have their virtual members marked 7512 // immediately. For all other classes, we mark their virtual members 7513 // at the end of the translation unit. 7514 if (Class->isLocalClass()) 7515 MarkVirtualMembersReferenced(Loc, Class); 7516 else 7517 VTableUses.push_back(std::make_pair(Class, Loc)); 7518} 7519 7520bool Sema::DefineUsedVTables() { 7521 if (VTableUses.empty()) 7522 return false; 7523 7524 // Note: The VTableUses vector could grow as a result of marking 7525 // the members of a class as "used", so we check the size each 7526 // time through the loop and prefer indices (with are stable) to 7527 // iterators (which are not). 7528 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7529 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7530 if (!Class) 7531 continue; 7532 7533 SourceLocation Loc = VTableUses[I].second; 7534 7535 // If this class has a key function, but that key function is 7536 // defined in another translation unit, we don't need to emit the 7537 // vtable even though we're using it. 7538 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7539 if (KeyFunction && !KeyFunction->hasBody()) { 7540 switch (KeyFunction->getTemplateSpecializationKind()) { 7541 case TSK_Undeclared: 7542 case TSK_ExplicitSpecialization: 7543 case TSK_ExplicitInstantiationDeclaration: 7544 // The key function is in another translation unit. 7545 continue; 7546 7547 case TSK_ExplicitInstantiationDefinition: 7548 case TSK_ImplicitInstantiation: 7549 // We will be instantiating the key function. 7550 break; 7551 } 7552 } else if (!KeyFunction) { 7553 // If we have a class with no key function that is the subject 7554 // of an explicit instantiation declaration, suppress the 7555 // vtable; it will live with the explicit instantiation 7556 // definition. 7557 bool IsExplicitInstantiationDeclaration 7558 = Class->getTemplateSpecializationKind() 7559 == TSK_ExplicitInstantiationDeclaration; 7560 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7561 REnd = Class->redecls_end(); 7562 R != REnd; ++R) { 7563 TemplateSpecializationKind TSK 7564 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7565 if (TSK == TSK_ExplicitInstantiationDeclaration) 7566 IsExplicitInstantiationDeclaration = true; 7567 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7568 IsExplicitInstantiationDeclaration = false; 7569 break; 7570 } 7571 } 7572 7573 if (IsExplicitInstantiationDeclaration) 7574 continue; 7575 } 7576 7577 // Mark all of the virtual members of this class as referenced, so 7578 // that we can build a vtable. Then, tell the AST consumer that a 7579 // vtable for this class is required. 7580 MarkVirtualMembersReferenced(Loc, Class); 7581 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7582 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7583 7584 // Optionally warn if we're emitting a weak vtable. 7585 if (Class->getLinkage() == ExternalLinkage && 7586 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7587 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7588 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7589 } 7590 } 7591 VTableUses.clear(); 7592 7593 return true; 7594} 7595 7596void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7597 const CXXRecordDecl *RD) { 7598 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7599 e = RD->method_end(); i != e; ++i) { 7600 CXXMethodDecl *MD = *i; 7601 7602 // C++ [basic.def.odr]p2: 7603 // [...] A virtual member function is used if it is not pure. [...] 7604 if (MD->isVirtual() && !MD->isPure()) 7605 MarkDeclarationReferenced(Loc, MD); 7606 } 7607 7608 // Only classes that have virtual bases need a VTT. 7609 if (RD->getNumVBases() == 0) 7610 return; 7611 7612 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7613 e = RD->bases_end(); i != e; ++i) { 7614 const CXXRecordDecl *Base = 7615 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7616 if (Base->getNumVBases() == 0) 7617 continue; 7618 MarkVirtualMembersReferenced(Loc, Base); 7619 } 7620} 7621 7622/// SetIvarInitializers - This routine builds initialization ASTs for the 7623/// Objective-C implementation whose ivars need be initialized. 7624void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7625 if (!getLangOptions().CPlusPlus) 7626 return; 7627 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7628 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7629 CollectIvarsToConstructOrDestruct(OID, ivars); 7630 if (ivars.empty()) 7631 return; 7632 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7633 for (unsigned i = 0; i < ivars.size(); i++) { 7634 FieldDecl *Field = ivars[i]; 7635 if (Field->isInvalidDecl()) 7636 continue; 7637 7638 CXXCtorInitializer *Member; 7639 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7640 InitializationKind InitKind = 7641 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7642 7643 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7644 ExprResult MemberInit = 7645 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7646 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7647 // Note, MemberInit could actually come back empty if no initialization 7648 // is required (e.g., because it would call a trivial default constructor) 7649 if (!MemberInit.get() || MemberInit.isInvalid()) 7650 continue; 7651 7652 Member = 7653 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7654 SourceLocation(), 7655 MemberInit.takeAs<Expr>(), 7656 SourceLocation()); 7657 AllToInit.push_back(Member); 7658 7659 // Be sure that the destructor is accessible and is marked as referenced. 7660 if (const RecordType *RecordTy 7661 = Context.getBaseElementType(Field->getType()) 7662 ->getAs<RecordType>()) { 7663 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7664 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7665 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7666 CheckDestructorAccess(Field->getLocation(), Destructor, 7667 PDiag(diag::err_access_dtor_ivar) 7668 << Context.getBaseElementType(Field->getType())); 7669 } 7670 } 7671 } 7672 ObjCImplementation->setIvarInitializers(Context, 7673 AllToInit.data(), AllToInit.size()); 7674 } 7675} 7676