SemaDeclCXX.cpp revision f4b793ceb60418b64d3593ba3c8240e3594bff8f
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_range I = Node->children(); I; ++I) 67 IsInvalid |= Visit(*I); 68 return IsInvalid; 69 } 70 71 /// VisitDeclRefExpr - Visit a reference to a declaration, to 72 /// determine whether this declaration can be used in the default 73 /// argument expression. 74 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 75 NamedDecl *Decl = DRE->getDecl(); 76 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 77 // C++ [dcl.fct.default]p9 78 // Default arguments are evaluated each time the function is 79 // called. The order of evaluation of function arguments is 80 // unspecified. Consequently, parameters of a function shall not 81 // be used in default argument expressions, even if they are not 82 // evaluated. Parameters of a function declared before a default 83 // argument expression are in scope and can hide namespace and 84 // class member names. 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_param) 87 << Param->getDeclName() << DefaultArg->getSourceRange(); 88 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 89 // C++ [dcl.fct.default]p7 90 // Local variables shall not be used in default argument 91 // expressions. 92 if (VDecl->isLocalVarDecl()) 93 return S->Diag(DRE->getSourceRange().getBegin(), 94 diag::err_param_default_argument_references_local) 95 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 96 } 97 98 return false; 99 } 100 101 /// VisitCXXThisExpr - Visit a C++ "this" expression. 102 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 103 // C++ [dcl.fct.default]p8: 104 // The keyword this shall not be used in a default argument of a 105 // member function. 106 return S->Diag(ThisE->getSourceRange().getBegin(), 107 diag::err_param_default_argument_references_this) 108 << ThisE->getSourceRange(); 109 } 110} 111 112bool 113Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 114 SourceLocation EqualLoc) { 115 if (RequireCompleteType(Param->getLocation(), Param->getType(), 116 diag::err_typecheck_decl_incomplete_type)) { 117 Param->setInvalidDecl(); 118 return true; 119 } 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 128 Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, &Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 CheckImplicitConversions(Arg, EqualLoc); 139 Arg = MaybeCreateExprWithCleanups(Arg); 140 141 // Okay: add the default argument to the parameter 142 Param->setDefaultArg(Arg); 143 144 // We have already instantiated this parameter; provide each of the 145 // instantiations with the uninstantiated default argument. 146 UnparsedDefaultArgInstantiationsMap::iterator InstPos 147 = UnparsedDefaultArgInstantiations.find(Param); 148 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 149 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 150 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 151 152 // We're done tracking this parameter's instantiations. 153 UnparsedDefaultArgInstantiations.erase(InstPos); 154 } 155 156 return false; 157} 158 159/// ActOnParamDefaultArgument - Check whether the default argument 160/// provided for a function parameter is well-formed. If so, attach it 161/// to the parameter declaration. 162void 163Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 164 Expr *DefaultArg) { 165 if (!param || !DefaultArg) 166 return; 167 168 ParmVarDecl *Param = cast<ParmVarDecl>(param); 169 UnparsedDefaultArgLocs.erase(Param); 170 171 // Default arguments are only permitted in C++ 172 if (!getLangOptions().CPlusPlus) { 173 Diag(EqualLoc, diag::err_param_default_argument) 174 << DefaultArg->getSourceRange(); 175 Param->setInvalidDecl(); 176 return; 177 } 178 179 // Check for unexpanded parameter packs. 180 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 181 Param->setInvalidDecl(); 182 return; 183 } 184 185 // Check that the default argument is well-formed 186 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 187 if (DefaultArgChecker.Visit(DefaultArg)) { 188 Param->setInvalidDecl(); 189 return; 190 } 191 192 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 193} 194 195/// ActOnParamUnparsedDefaultArgument - We've seen a default 196/// argument for a function parameter, but we can't parse it yet 197/// because we're inside a class definition. Note that this default 198/// argument will be parsed later. 199void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 200 SourceLocation EqualLoc, 201 SourceLocation ArgLoc) { 202 if (!param) 203 return; 204 205 ParmVarDecl *Param = cast<ParmVarDecl>(param); 206 if (Param) 207 Param->setUnparsedDefaultArg(); 208 209 UnparsedDefaultArgLocs[Param] = ArgLoc; 210} 211 212/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 213/// the default argument for the parameter param failed. 214void Sema::ActOnParamDefaultArgumentError(Decl *param) { 215 if (!param) 216 return; 217 218 ParmVarDecl *Param = cast<ParmVarDecl>(param); 219 220 Param->setInvalidDecl(); 221 222 UnparsedDefaultArgLocs.erase(Param); 223} 224 225/// CheckExtraCXXDefaultArguments - Check for any extra default 226/// arguments in the declarator, which is not a function declaration 227/// or definition and therefore is not permitted to have default 228/// arguments. This routine should be invoked for every declarator 229/// that is not a function declaration or definition. 230void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 231 // C++ [dcl.fct.default]p3 232 // A default argument expression shall be specified only in the 233 // parameter-declaration-clause of a function declaration or in a 234 // template-parameter (14.1). It shall not be specified for a 235 // parameter pack. If it is specified in a 236 // parameter-declaration-clause, it shall not occur within a 237 // declarator or abstract-declarator of a parameter-declaration. 238 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 239 DeclaratorChunk &chunk = D.getTypeObject(i); 240 if (chunk.Kind == DeclaratorChunk::Function) { 241 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 242 ParmVarDecl *Param = 243 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 244 if (Param->hasUnparsedDefaultArg()) { 245 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 248 delete Toks; 249 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 250 } else if (Param->getDefaultArg()) { 251 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 252 << Param->getDefaultArg()->getSourceRange(); 253 Param->setDefaultArg(0); 254 } 255 } 256 } 257 } 258} 259 260// MergeCXXFunctionDecl - Merge two declarations of the same C++ 261// function, once we already know that they have the same 262// type. Subroutine of MergeFunctionDecl. Returns true if there was an 263// error, false otherwise. 264bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 265 bool Invalid = false; 266 267 // C++ [dcl.fct.default]p4: 268 // For non-template functions, default arguments can be added in 269 // later declarations of a function in the same 270 // scope. Declarations in different scopes have completely 271 // distinct sets of default arguments. That is, declarations in 272 // inner scopes do not acquire default arguments from 273 // declarations in outer scopes, and vice versa. In a given 274 // function declaration, all parameters subsequent to a 275 // parameter with a default argument shall have default 276 // arguments supplied in this or previous declarations. A 277 // default argument shall not be redefined by a later 278 // declaration (not even to the same value). 279 // 280 // C++ [dcl.fct.default]p6: 281 // Except for member functions of class templates, the default arguments 282 // in a member function definition that appears outside of the class 283 // definition are added to the set of default arguments provided by the 284 // member function declaration in the class definition. 285 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 286 ParmVarDecl *OldParam = Old->getParamDecl(p); 287 ParmVarDecl *NewParam = New->getParamDecl(p); 288 289 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 290 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 291 // hint here. Alternatively, we could walk the type-source information 292 // for NewParam to find the last source location in the type... but it 293 // isn't worth the effort right now. This is the kind of test case that 294 // is hard to get right: 295 296 // int f(int); 297 // void g(int (*fp)(int) = f); 298 // void g(int (*fp)(int) = &f); 299 Diag(NewParam->getLocation(), 300 diag::err_param_default_argument_redefinition) 301 << NewParam->getDefaultArgRange(); 302 303 // Look for the function declaration where the default argument was 304 // actually written, which may be a declaration prior to Old. 305 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 306 Older; Older = Older->getPreviousDeclaration()) { 307 if (!Older->getParamDecl(p)->hasDefaultArg()) 308 break; 309 310 OldParam = Older->getParamDecl(p); 311 } 312 313 Diag(OldParam->getLocation(), diag::note_previous_definition) 314 << OldParam->getDefaultArgRange(); 315 Invalid = true; 316 } else if (OldParam->hasDefaultArg()) { 317 // Merge the old default argument into the new parameter. 318 // It's important to use getInit() here; getDefaultArg() 319 // strips off any top-level ExprWithCleanups. 320 NewParam->setHasInheritedDefaultArg(); 321 if (OldParam->hasUninstantiatedDefaultArg()) 322 NewParam->setUninstantiatedDefaultArg( 323 OldParam->getUninstantiatedDefaultArg()); 324 else 325 NewParam->setDefaultArg(OldParam->getInit()); 326 } else if (NewParam->hasDefaultArg()) { 327 if (New->getDescribedFunctionTemplate()) { 328 // Paragraph 4, quoted above, only applies to non-template functions. 329 Diag(NewParam->getLocation(), 330 diag::err_param_default_argument_template_redecl) 331 << NewParam->getDefaultArgRange(); 332 Diag(Old->getLocation(), diag::note_template_prev_declaration) 333 << false; 334 } else if (New->getTemplateSpecializationKind() 335 != TSK_ImplicitInstantiation && 336 New->getTemplateSpecializationKind() != TSK_Undeclared) { 337 // C++ [temp.expr.spec]p21: 338 // Default function arguments shall not be specified in a declaration 339 // or a definition for one of the following explicit specializations: 340 // - the explicit specialization of a function template; 341 // - the explicit specialization of a member function template; 342 // - the explicit specialization of a member function of a class 343 // template where the class template specialization to which the 344 // member function specialization belongs is implicitly 345 // instantiated. 346 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 347 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 348 << New->getDeclName() 349 << NewParam->getDefaultArgRange(); 350 } else if (New->getDeclContext()->isDependentContext()) { 351 // C++ [dcl.fct.default]p6 (DR217): 352 // Default arguments for a member function of a class template shall 353 // be specified on the initial declaration of the member function 354 // within the class template. 355 // 356 // Reading the tea leaves a bit in DR217 and its reference to DR205 357 // leads me to the conclusion that one cannot add default function 358 // arguments for an out-of-line definition of a member function of a 359 // dependent type. 360 int WhichKind = 2; 361 if (CXXRecordDecl *Record 362 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 363 if (Record->getDescribedClassTemplate()) 364 WhichKind = 0; 365 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 366 WhichKind = 1; 367 else 368 WhichKind = 2; 369 } 370 371 Diag(NewParam->getLocation(), 372 diag::err_param_default_argument_member_template_redecl) 373 << WhichKind 374 << NewParam->getDefaultArgRange(); 375 } 376 } 377 } 378 379 if (CheckEquivalentExceptionSpec(Old, New)) 380 Invalid = true; 381 382 return Invalid; 383} 384 385/// CheckCXXDefaultArguments - Verify that the default arguments for a 386/// function declaration are well-formed according to C++ 387/// [dcl.fct.default]. 388void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 389 unsigned NumParams = FD->getNumParams(); 390 unsigned p; 391 392 // Find first parameter with a default argument 393 for (p = 0; p < NumParams; ++p) { 394 ParmVarDecl *Param = FD->getParamDecl(p); 395 if (Param->hasDefaultArg()) 396 break; 397 } 398 399 // C++ [dcl.fct.default]p4: 400 // In a given function declaration, all parameters 401 // subsequent to a parameter with a default argument shall 402 // have default arguments supplied in this or previous 403 // declarations. A default argument shall not be redefined 404 // by a later declaration (not even to the same value). 405 unsigned LastMissingDefaultArg = 0; 406 for (; p < NumParams; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (!Param->hasDefaultArg()) { 409 if (Param->isInvalidDecl()) 410 /* We already complained about this parameter. */; 411 else if (Param->getIdentifier()) 412 Diag(Param->getLocation(), 413 diag::err_param_default_argument_missing_name) 414 << Param->getIdentifier(); 415 else 416 Diag(Param->getLocation(), 417 diag::err_param_default_argument_missing); 418 419 LastMissingDefaultArg = p; 420 } 421 } 422 423 if (LastMissingDefaultArg > 0) { 424 // Some default arguments were missing. Clear out all of the 425 // default arguments up to (and including) the last missing 426 // default argument, so that we leave the function parameters 427 // in a semantically valid state. 428 for (p = 0; p <= LastMissingDefaultArg; ++p) { 429 ParmVarDecl *Param = FD->getParamDecl(p); 430 if (Param->hasDefaultArg()) { 431 Param->setDefaultArg(0); 432 } 433 } 434 } 435} 436 437/// isCurrentClassName - Determine whether the identifier II is the 438/// name of the class type currently being defined. In the case of 439/// nested classes, this will only return true if II is the name of 440/// the innermost class. 441bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 442 const CXXScopeSpec *SS) { 443 assert(getLangOptions().CPlusPlus && "No class names in C!"); 444 445 CXXRecordDecl *CurDecl; 446 if (SS && SS->isSet() && !SS->isInvalid()) { 447 DeclContext *DC = computeDeclContext(*SS, true); 448 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 449 } else 450 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 451 452 if (CurDecl && CurDecl->getIdentifier()) 453 return &II == CurDecl->getIdentifier(); 454 else 455 return false; 456} 457 458/// \brief Check the validity of a C++ base class specifier. 459/// 460/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 461/// and returns NULL otherwise. 462CXXBaseSpecifier * 463Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 464 SourceRange SpecifierRange, 465 bool Virtual, AccessSpecifier Access, 466 TypeSourceInfo *TInfo, 467 SourceLocation EllipsisLoc) { 468 QualType BaseType = TInfo->getType(); 469 470 // C++ [class.union]p1: 471 // A union shall not have base classes. 472 if (Class->isUnion()) { 473 Diag(Class->getLocation(), diag::err_base_clause_on_union) 474 << SpecifierRange; 475 return 0; 476 } 477 478 if (EllipsisLoc.isValid() && 479 !TInfo->getType()->containsUnexpandedParameterPack()) { 480 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 481 << TInfo->getTypeLoc().getSourceRange(); 482 EllipsisLoc = SourceLocation(); 483 } 484 485 if (BaseType->isDependentType()) 486 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 487 Class->getTagKind() == TTK_Class, 488 Access, TInfo, EllipsisLoc); 489 490 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 491 492 // Base specifiers must be record types. 493 if (!BaseType->isRecordType()) { 494 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 495 return 0; 496 } 497 498 // C++ [class.union]p1: 499 // A union shall not be used as a base class. 500 if (BaseType->isUnionType()) { 501 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 502 return 0; 503 } 504 505 // C++ [class.derived]p2: 506 // The class-name in a base-specifier shall not be an incompletely 507 // defined class. 508 if (RequireCompleteType(BaseLoc, BaseType, 509 PDiag(diag::err_incomplete_base_class) 510 << SpecifierRange)) { 511 Class->setInvalidDecl(); 512 return 0; 513 } 514 515 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 516 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 517 assert(BaseDecl && "Record type has no declaration"); 518 BaseDecl = BaseDecl->getDefinition(); 519 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 520 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 521 assert(CXXBaseDecl && "Base type is not a C++ type"); 522 523 // C++ [class.derived]p2: 524 // If a class is marked with the class-virt-specifier final and it appears 525 // as a base-type-specifier in a base-clause (10 class.derived), the program 526 // is ill-formed. 527 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 528 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 529 << CXXBaseDecl->getDeclName(); 530 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 531 << CXXBaseDecl->getDeclName(); 532 return 0; 533 } 534 535 if (BaseDecl->isInvalidDecl()) 536 Class->setInvalidDecl(); 537 538 // Create the base specifier. 539 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 540 Class->getTagKind() == TTK_Class, 541 Access, TInfo, EllipsisLoc); 542} 543 544/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 545/// one entry in the base class list of a class specifier, for 546/// example: 547/// class foo : public bar, virtual private baz { 548/// 'public bar' and 'virtual private baz' are each base-specifiers. 549BaseResult 550Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 551 bool Virtual, AccessSpecifier Access, 552 ParsedType basetype, SourceLocation BaseLoc, 553 SourceLocation EllipsisLoc) { 554 if (!classdecl) 555 return true; 556 557 AdjustDeclIfTemplate(classdecl); 558 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 559 if (!Class) 560 return true; 561 562 TypeSourceInfo *TInfo = 0; 563 GetTypeFromParser(basetype, &TInfo); 564 565 if (EllipsisLoc.isInvalid() && 566 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 567 UPPC_BaseType)) 568 return true; 569 570 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 571 Virtual, Access, TInfo, 572 EllipsisLoc)) 573 return BaseSpec; 574 575 return true; 576} 577 578/// \brief Performs the actual work of attaching the given base class 579/// specifiers to a C++ class. 580bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 581 unsigned NumBases) { 582 if (NumBases == 0) 583 return false; 584 585 // Used to keep track of which base types we have already seen, so 586 // that we can properly diagnose redundant direct base types. Note 587 // that the key is always the unqualified canonical type of the base 588 // class. 589 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 590 591 // Copy non-redundant base specifiers into permanent storage. 592 unsigned NumGoodBases = 0; 593 bool Invalid = false; 594 for (unsigned idx = 0; idx < NumBases; ++idx) { 595 QualType NewBaseType 596 = Context.getCanonicalType(Bases[idx]->getType()); 597 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 598 if (!Class->hasObjectMember()) { 599 if (const RecordType *FDTTy = 600 NewBaseType.getTypePtr()->getAs<RecordType>()) 601 if (FDTTy->getDecl()->hasObjectMember()) 602 Class->setHasObjectMember(true); 603 } 604 605 if (KnownBaseTypes[NewBaseType]) { 606 // C++ [class.mi]p3: 607 // A class shall not be specified as a direct base class of a 608 // derived class more than once. 609 Diag(Bases[idx]->getSourceRange().getBegin(), 610 diag::err_duplicate_base_class) 611 << KnownBaseTypes[NewBaseType]->getType() 612 << Bases[idx]->getSourceRange(); 613 614 // Delete the duplicate base class specifier; we're going to 615 // overwrite its pointer later. 616 Context.Deallocate(Bases[idx]); 617 618 Invalid = true; 619 } else { 620 // Okay, add this new base class. 621 KnownBaseTypes[NewBaseType] = Bases[idx]; 622 Bases[NumGoodBases++] = Bases[idx]; 623 } 624 } 625 626 // Attach the remaining base class specifiers to the derived class. 627 Class->setBases(Bases, NumGoodBases); 628 629 // Delete the remaining (good) base class specifiers, since their 630 // data has been copied into the CXXRecordDecl. 631 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 632 Context.Deallocate(Bases[idx]); 633 634 return Invalid; 635} 636 637/// ActOnBaseSpecifiers - Attach the given base specifiers to the 638/// class, after checking whether there are any duplicate base 639/// classes. 640void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 641 unsigned NumBases) { 642 if (!ClassDecl || !Bases || !NumBases) 643 return; 644 645 AdjustDeclIfTemplate(ClassDecl); 646 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 647 (CXXBaseSpecifier**)(Bases), NumBases); 648} 649 650static CXXRecordDecl *GetClassForType(QualType T) { 651 if (const RecordType *RT = T->getAs<RecordType>()) 652 return cast<CXXRecordDecl>(RT->getDecl()); 653 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 654 return ICT->getDecl(); 655 else 656 return 0; 657} 658 659/// \brief Determine whether the type \p Derived is a C++ class that is 660/// derived from the type \p Base. 661bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 662 if (!getLangOptions().CPlusPlus) 663 return false; 664 665 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 666 if (!DerivedRD) 667 return false; 668 669 CXXRecordDecl *BaseRD = GetClassForType(Base); 670 if (!BaseRD) 671 return false; 672 673 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 674 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 675} 676 677/// \brief Determine whether the type \p Derived is a C++ class that is 678/// derived from the type \p Base. 679bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 680 if (!getLangOptions().CPlusPlus) 681 return false; 682 683 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 684 if (!DerivedRD) 685 return false; 686 687 CXXRecordDecl *BaseRD = GetClassForType(Base); 688 if (!BaseRD) 689 return false; 690 691 return DerivedRD->isDerivedFrom(BaseRD, Paths); 692} 693 694void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 695 CXXCastPath &BasePathArray) { 696 assert(BasePathArray.empty() && "Base path array must be empty!"); 697 assert(Paths.isRecordingPaths() && "Must record paths!"); 698 699 const CXXBasePath &Path = Paths.front(); 700 701 // We first go backward and check if we have a virtual base. 702 // FIXME: It would be better if CXXBasePath had the base specifier for 703 // the nearest virtual base. 704 unsigned Start = 0; 705 for (unsigned I = Path.size(); I != 0; --I) { 706 if (Path[I - 1].Base->isVirtual()) { 707 Start = I - 1; 708 break; 709 } 710 } 711 712 // Now add all bases. 713 for (unsigned I = Start, E = Path.size(); I != E; ++I) 714 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 715} 716 717/// \brief Determine whether the given base path includes a virtual 718/// base class. 719bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 720 for (CXXCastPath::const_iterator B = BasePath.begin(), 721 BEnd = BasePath.end(); 722 B != BEnd; ++B) 723 if ((*B)->isVirtual()) 724 return true; 725 726 return false; 727} 728 729/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 730/// conversion (where Derived and Base are class types) is 731/// well-formed, meaning that the conversion is unambiguous (and 732/// that all of the base classes are accessible). Returns true 733/// and emits a diagnostic if the code is ill-formed, returns false 734/// otherwise. Loc is the location where this routine should point to 735/// if there is an error, and Range is the source range to highlight 736/// if there is an error. 737bool 738Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 739 unsigned InaccessibleBaseID, 740 unsigned AmbigiousBaseConvID, 741 SourceLocation Loc, SourceRange Range, 742 DeclarationName Name, 743 CXXCastPath *BasePath) { 744 // First, determine whether the path from Derived to Base is 745 // ambiguous. This is slightly more expensive than checking whether 746 // the Derived to Base conversion exists, because here we need to 747 // explore multiple paths to determine if there is an ambiguity. 748 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 749 /*DetectVirtual=*/false); 750 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 751 assert(DerivationOkay && 752 "Can only be used with a derived-to-base conversion"); 753 (void)DerivationOkay; 754 755 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 756 if (InaccessibleBaseID) { 757 // Check that the base class can be accessed. 758 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 759 InaccessibleBaseID)) { 760 case AR_inaccessible: 761 return true; 762 case AR_accessible: 763 case AR_dependent: 764 case AR_delayed: 765 break; 766 } 767 } 768 769 // Build a base path if necessary. 770 if (BasePath) 771 BuildBasePathArray(Paths, *BasePath); 772 return false; 773 } 774 775 // We know that the derived-to-base conversion is ambiguous, and 776 // we're going to produce a diagnostic. Perform the derived-to-base 777 // search just one more time to compute all of the possible paths so 778 // that we can print them out. This is more expensive than any of 779 // the previous derived-to-base checks we've done, but at this point 780 // performance isn't as much of an issue. 781 Paths.clear(); 782 Paths.setRecordingPaths(true); 783 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 784 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 785 (void)StillOkay; 786 787 // Build up a textual representation of the ambiguous paths, e.g., 788 // D -> B -> A, that will be used to illustrate the ambiguous 789 // conversions in the diagnostic. We only print one of the paths 790 // to each base class subobject. 791 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 792 793 Diag(Loc, AmbigiousBaseConvID) 794 << Derived << Base << PathDisplayStr << Range << Name; 795 return true; 796} 797 798bool 799Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 800 SourceLocation Loc, SourceRange Range, 801 CXXCastPath *BasePath, 802 bool IgnoreAccess) { 803 return CheckDerivedToBaseConversion(Derived, Base, 804 IgnoreAccess ? 0 805 : diag::err_upcast_to_inaccessible_base, 806 diag::err_ambiguous_derived_to_base_conv, 807 Loc, Range, DeclarationName(), 808 BasePath); 809} 810 811 812/// @brief Builds a string representing ambiguous paths from a 813/// specific derived class to different subobjects of the same base 814/// class. 815/// 816/// This function builds a string that can be used in error messages 817/// to show the different paths that one can take through the 818/// inheritance hierarchy to go from the derived class to different 819/// subobjects of a base class. The result looks something like this: 820/// @code 821/// struct D -> struct B -> struct A 822/// struct D -> struct C -> struct A 823/// @endcode 824std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 825 std::string PathDisplayStr; 826 std::set<unsigned> DisplayedPaths; 827 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 828 Path != Paths.end(); ++Path) { 829 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 830 // We haven't displayed a path to this particular base 831 // class subobject yet. 832 PathDisplayStr += "\n "; 833 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 834 for (CXXBasePath::const_iterator Element = Path->begin(); 835 Element != Path->end(); ++Element) 836 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 837 } 838 } 839 840 return PathDisplayStr; 841} 842 843//===----------------------------------------------------------------------===// 844// C++ class member Handling 845//===----------------------------------------------------------------------===// 846 847/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 848Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 849 SourceLocation ASLoc, 850 SourceLocation ColonLoc) { 851 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 852 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 853 ASLoc, ColonLoc); 854 CurContext->addHiddenDecl(ASDecl); 855 return ASDecl; 856} 857 858/// CheckOverrideControl - Check C++0x override control semantics. 859void Sema::CheckOverrideControl(const Decl *D) { 860 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 861 if (!MD || !MD->isVirtual()) 862 return; 863 864 if (MD->isDependentContext()) 865 return; 866 867 // C++0x [class.virtual]p3: 868 // If a virtual function is marked with the virt-specifier override and does 869 // not override a member function of a base class, 870 // the program is ill-formed. 871 bool HasOverriddenMethods = 872 MD->begin_overridden_methods() != MD->end_overridden_methods(); 873 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 874 Diag(MD->getLocation(), 875 diag::err_function_marked_override_not_overriding) 876 << MD->getDeclName(); 877 return; 878 } 879 880 // C++0x [class.derived]p8: 881 // In a class definition marked with the class-virt-specifier explicit, 882 // if a virtual member function that is neither implicitly-declared nor a 883 // destructor overrides a member function of a base class and it is not 884 // marked with the virt-specifier override, the program is ill-formed. 885 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 886 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 887 llvm::SmallVector<const CXXMethodDecl*, 4> 888 OverriddenMethods(MD->begin_overridden_methods(), 889 MD->end_overridden_methods()); 890 891 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 892 << MD->getDeclName() 893 << (unsigned)OverriddenMethods.size(); 894 895 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 896 Diag(OverriddenMethods[I]->getLocation(), 897 diag::note_overridden_virtual_function); 898 } 899} 900 901/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 902/// function overrides a virtual member function marked 'final', according to 903/// C++0x [class.virtual]p3. 904bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 905 const CXXMethodDecl *Old) { 906 if (!Old->hasAttr<FinalAttr>()) 907 return false; 908 909 Diag(New->getLocation(), diag::err_final_function_overridden) 910 << New->getDeclName(); 911 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 912 return true; 913} 914 915/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 916/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 917/// bitfield width if there is one and 'InitExpr' specifies the initializer if 918/// any. 919Decl * 920Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 921 MultiTemplateParamsArg TemplateParameterLists, 922 ExprTy *BW, const VirtSpecifiers &VS, 923 ExprTy *InitExpr, bool IsDefinition, 924 bool Deleted) { 925 const DeclSpec &DS = D.getDeclSpec(); 926 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 927 DeclarationName Name = NameInfo.getName(); 928 SourceLocation Loc = NameInfo.getLoc(); 929 930 // For anonymous bitfields, the location should point to the type. 931 if (Loc.isInvalid()) 932 Loc = D.getSourceRange().getBegin(); 933 934 Expr *BitWidth = static_cast<Expr*>(BW); 935 Expr *Init = static_cast<Expr*>(InitExpr); 936 937 assert(isa<CXXRecordDecl>(CurContext)); 938 assert(!DS.isFriendSpecified()); 939 940 bool isFunc = false; 941 if (D.isFunctionDeclarator()) 942 isFunc = true; 943 else if (D.getNumTypeObjects() == 0 && 944 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 945 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 946 isFunc = TDType->isFunctionType(); 947 } 948 949 // C++ 9.2p6: A member shall not be declared to have automatic storage 950 // duration (auto, register) or with the extern storage-class-specifier. 951 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 952 // data members and cannot be applied to names declared const or static, 953 // and cannot be applied to reference members. 954 switch (DS.getStorageClassSpec()) { 955 case DeclSpec::SCS_unspecified: 956 case DeclSpec::SCS_typedef: 957 case DeclSpec::SCS_static: 958 // FALL THROUGH. 959 break; 960 case DeclSpec::SCS_mutable: 961 if (isFunc) { 962 if (DS.getStorageClassSpecLoc().isValid()) 963 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 964 else 965 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 966 967 // FIXME: It would be nicer if the keyword was ignored only for this 968 // declarator. Otherwise we could get follow-up errors. 969 D.getMutableDeclSpec().ClearStorageClassSpecs(); 970 } 971 break; 972 default: 973 if (DS.getStorageClassSpecLoc().isValid()) 974 Diag(DS.getStorageClassSpecLoc(), 975 diag::err_storageclass_invalid_for_member); 976 else 977 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 978 D.getMutableDeclSpec().ClearStorageClassSpecs(); 979 } 980 981 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 982 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 983 !isFunc); 984 985 Decl *Member; 986 if (isInstField) { 987 CXXScopeSpec &SS = D.getCXXScopeSpec(); 988 989 990 if (SS.isSet() && !SS.isInvalid()) { 991 // The user provided a superfluous scope specifier inside a class 992 // definition: 993 // 994 // class X { 995 // int X::member; 996 // }; 997 DeclContext *DC = 0; 998 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 999 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1000 << Name << FixItHint::CreateRemoval(SS.getRange()); 1001 else 1002 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1003 << Name << SS.getRange(); 1004 1005 SS.clear(); 1006 } 1007 1008 // FIXME: Check for template parameters! 1009 // FIXME: Check that the name is an identifier! 1010 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1011 AS); 1012 assert(Member && "HandleField never returns null"); 1013 } else { 1014 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1015 if (!Member) { 1016 return 0; 1017 } 1018 1019 // Non-instance-fields can't have a bitfield. 1020 if (BitWidth) { 1021 if (Member->isInvalidDecl()) { 1022 // don't emit another diagnostic. 1023 } else if (isa<VarDecl>(Member)) { 1024 // C++ 9.6p3: A bit-field shall not be a static member. 1025 // "static member 'A' cannot be a bit-field" 1026 Diag(Loc, diag::err_static_not_bitfield) 1027 << Name << BitWidth->getSourceRange(); 1028 } else if (isa<TypedefDecl>(Member)) { 1029 // "typedef member 'x' cannot be a bit-field" 1030 Diag(Loc, diag::err_typedef_not_bitfield) 1031 << Name << BitWidth->getSourceRange(); 1032 } else { 1033 // A function typedef ("typedef int f(); f a;"). 1034 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1035 Diag(Loc, diag::err_not_integral_type_bitfield) 1036 << Name << cast<ValueDecl>(Member)->getType() 1037 << BitWidth->getSourceRange(); 1038 } 1039 1040 BitWidth = 0; 1041 Member->setInvalidDecl(); 1042 } 1043 1044 Member->setAccess(AS); 1045 1046 // If we have declared a member function template, set the access of the 1047 // templated declaration as well. 1048 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1049 FunTmpl->getTemplatedDecl()->setAccess(AS); 1050 } 1051 1052 if (VS.isOverrideSpecified()) { 1053 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1054 if (!MD || !MD->isVirtual()) { 1055 Diag(Member->getLocStart(), 1056 diag::override_keyword_only_allowed_on_virtual_member_functions) 1057 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1058 } else 1059 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1060 } 1061 if (VS.isFinalSpecified()) { 1062 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1063 if (!MD || !MD->isVirtual()) { 1064 Diag(Member->getLocStart(), 1065 diag::override_keyword_only_allowed_on_virtual_member_functions) 1066 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1067 } else 1068 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1069 } 1070 1071 CheckOverrideControl(Member); 1072 1073 assert((Name || isInstField) && "No identifier for non-field ?"); 1074 1075 if (Init) 1076 AddInitializerToDecl(Member, Init, false); 1077 if (Deleted) // FIXME: Source location is not very good. 1078 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1079 1080 if (isInstField) 1081 FieldCollector->Add(cast<FieldDecl>(Member)); 1082 return Member; 1083} 1084 1085/// \brief Find the direct and/or virtual base specifiers that 1086/// correspond to the given base type, for use in base initialization 1087/// within a constructor. 1088static bool FindBaseInitializer(Sema &SemaRef, 1089 CXXRecordDecl *ClassDecl, 1090 QualType BaseType, 1091 const CXXBaseSpecifier *&DirectBaseSpec, 1092 const CXXBaseSpecifier *&VirtualBaseSpec) { 1093 // First, check for a direct base class. 1094 DirectBaseSpec = 0; 1095 for (CXXRecordDecl::base_class_const_iterator Base 1096 = ClassDecl->bases_begin(); 1097 Base != ClassDecl->bases_end(); ++Base) { 1098 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1099 // We found a direct base of this type. That's what we're 1100 // initializing. 1101 DirectBaseSpec = &*Base; 1102 break; 1103 } 1104 } 1105 1106 // Check for a virtual base class. 1107 // FIXME: We might be able to short-circuit this if we know in advance that 1108 // there are no virtual bases. 1109 VirtualBaseSpec = 0; 1110 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1111 // We haven't found a base yet; search the class hierarchy for a 1112 // virtual base class. 1113 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1114 /*DetectVirtual=*/false); 1115 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1116 BaseType, Paths)) { 1117 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1118 Path != Paths.end(); ++Path) { 1119 if (Path->back().Base->isVirtual()) { 1120 VirtualBaseSpec = Path->back().Base; 1121 break; 1122 } 1123 } 1124 } 1125 } 1126 1127 return DirectBaseSpec || VirtualBaseSpec; 1128} 1129 1130/// ActOnMemInitializer - Handle a C++ member initializer. 1131MemInitResult 1132Sema::ActOnMemInitializer(Decl *ConstructorD, 1133 Scope *S, 1134 CXXScopeSpec &SS, 1135 IdentifierInfo *MemberOrBase, 1136 ParsedType TemplateTypeTy, 1137 SourceLocation IdLoc, 1138 SourceLocation LParenLoc, 1139 ExprTy **Args, unsigned NumArgs, 1140 SourceLocation RParenLoc, 1141 SourceLocation EllipsisLoc) { 1142 if (!ConstructorD) 1143 return true; 1144 1145 AdjustDeclIfTemplate(ConstructorD); 1146 1147 CXXConstructorDecl *Constructor 1148 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1149 if (!Constructor) { 1150 // The user wrote a constructor initializer on a function that is 1151 // not a C++ constructor. Ignore the error for now, because we may 1152 // have more member initializers coming; we'll diagnose it just 1153 // once in ActOnMemInitializers. 1154 return true; 1155 } 1156 1157 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1158 1159 // C++ [class.base.init]p2: 1160 // Names in a mem-initializer-id are looked up in the scope of the 1161 // constructor's class and, if not found in that scope, are looked 1162 // up in the scope containing the constructor's definition. 1163 // [Note: if the constructor's class contains a member with the 1164 // same name as a direct or virtual base class of the class, a 1165 // mem-initializer-id naming the member or base class and composed 1166 // of a single identifier refers to the class member. A 1167 // mem-initializer-id for the hidden base class may be specified 1168 // using a qualified name. ] 1169 if (!SS.getScopeRep() && !TemplateTypeTy) { 1170 // Look for a member, first. 1171 FieldDecl *Member = 0; 1172 DeclContext::lookup_result Result 1173 = ClassDecl->lookup(MemberOrBase); 1174 if (Result.first != Result.second) { 1175 Member = dyn_cast<FieldDecl>(*Result.first); 1176 1177 if (Member) { 1178 if (EllipsisLoc.isValid()) 1179 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1180 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1181 1182 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1183 LParenLoc, RParenLoc); 1184 } 1185 1186 // Handle anonymous union case. 1187 if (IndirectFieldDecl* IndirectField 1188 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1189 if (EllipsisLoc.isValid()) 1190 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1191 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1192 1193 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1194 NumArgs, IdLoc, 1195 LParenLoc, RParenLoc); 1196 } 1197 } 1198 } 1199 // It didn't name a member, so see if it names a class. 1200 QualType BaseType; 1201 TypeSourceInfo *TInfo = 0; 1202 1203 if (TemplateTypeTy) { 1204 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1205 } else { 1206 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1207 LookupParsedName(R, S, &SS); 1208 1209 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1210 if (!TyD) { 1211 if (R.isAmbiguous()) return true; 1212 1213 // We don't want access-control diagnostics here. 1214 R.suppressDiagnostics(); 1215 1216 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1217 bool NotUnknownSpecialization = false; 1218 DeclContext *DC = computeDeclContext(SS, false); 1219 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1220 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1221 1222 if (!NotUnknownSpecialization) { 1223 // When the scope specifier can refer to a member of an unknown 1224 // specialization, we take it as a type name. 1225 BaseType = CheckTypenameType(ETK_None, 1226 (NestedNameSpecifier *)SS.getScopeRep(), 1227 *MemberOrBase, SourceLocation(), 1228 SS.getRange(), IdLoc); 1229 if (BaseType.isNull()) 1230 return true; 1231 1232 R.clear(); 1233 R.setLookupName(MemberOrBase); 1234 } 1235 } 1236 1237 // If no results were found, try to correct typos. 1238 if (R.empty() && BaseType.isNull() && 1239 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1240 R.isSingleResult()) { 1241 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1242 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1243 // We have found a non-static data member with a similar 1244 // name to what was typed; complain and initialize that 1245 // member. 1246 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1247 << MemberOrBase << true << R.getLookupName() 1248 << FixItHint::CreateReplacement(R.getNameLoc(), 1249 R.getLookupName().getAsString()); 1250 Diag(Member->getLocation(), diag::note_previous_decl) 1251 << Member->getDeclName(); 1252 1253 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1254 LParenLoc, RParenLoc); 1255 } 1256 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1257 const CXXBaseSpecifier *DirectBaseSpec; 1258 const CXXBaseSpecifier *VirtualBaseSpec; 1259 if (FindBaseInitializer(*this, ClassDecl, 1260 Context.getTypeDeclType(Type), 1261 DirectBaseSpec, VirtualBaseSpec)) { 1262 // We have found a direct or virtual base class with a 1263 // similar name to what was typed; complain and initialize 1264 // that base class. 1265 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1266 << MemberOrBase << false << R.getLookupName() 1267 << FixItHint::CreateReplacement(R.getNameLoc(), 1268 R.getLookupName().getAsString()); 1269 1270 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1271 : VirtualBaseSpec; 1272 Diag(BaseSpec->getSourceRange().getBegin(), 1273 diag::note_base_class_specified_here) 1274 << BaseSpec->getType() 1275 << BaseSpec->getSourceRange(); 1276 1277 TyD = Type; 1278 } 1279 } 1280 } 1281 1282 if (!TyD && BaseType.isNull()) { 1283 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1284 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1285 return true; 1286 } 1287 } 1288 1289 if (BaseType.isNull()) { 1290 BaseType = Context.getTypeDeclType(TyD); 1291 if (SS.isSet()) { 1292 NestedNameSpecifier *Qualifier = 1293 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1294 1295 // FIXME: preserve source range information 1296 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1297 } 1298 } 1299 } 1300 1301 if (!TInfo) 1302 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1303 1304 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1305 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1306} 1307 1308/// Checks an initializer expression for use of uninitialized fields, such as 1309/// containing the field that is being initialized. Returns true if there is an 1310/// uninitialized field was used an updates the SourceLocation parameter; false 1311/// otherwise. 1312static bool InitExprContainsUninitializedFields(const Stmt *S, 1313 const ValueDecl *LhsField, 1314 SourceLocation *L) { 1315 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1316 1317 if (isa<CallExpr>(S)) { 1318 // Do not descend into function calls or constructors, as the use 1319 // of an uninitialized field may be valid. One would have to inspect 1320 // the contents of the function/ctor to determine if it is safe or not. 1321 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1322 // may be safe, depending on what the function/ctor does. 1323 return false; 1324 } 1325 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1326 const NamedDecl *RhsField = ME->getMemberDecl(); 1327 1328 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1329 // The member expression points to a static data member. 1330 assert(VD->isStaticDataMember() && 1331 "Member points to non-static data member!"); 1332 (void)VD; 1333 return false; 1334 } 1335 1336 if (isa<EnumConstantDecl>(RhsField)) { 1337 // The member expression points to an enum. 1338 return false; 1339 } 1340 1341 if (RhsField == LhsField) { 1342 // Initializing a field with itself. Throw a warning. 1343 // But wait; there are exceptions! 1344 // Exception #1: The field may not belong to this record. 1345 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1346 const Expr *base = ME->getBase(); 1347 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1348 // Even though the field matches, it does not belong to this record. 1349 return false; 1350 } 1351 // None of the exceptions triggered; return true to indicate an 1352 // uninitialized field was used. 1353 *L = ME->getMemberLoc(); 1354 return true; 1355 } 1356 } else if (isa<SizeOfAlignOfExpr>(S)) { 1357 // sizeof/alignof doesn't reference contents, do not warn. 1358 return false; 1359 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1360 // address-of doesn't reference contents (the pointer may be dereferenced 1361 // in the same expression but it would be rare; and weird). 1362 if (UOE->getOpcode() == UO_AddrOf) 1363 return false; 1364 } 1365 for (Stmt::const_child_range it = S->children(); it; ++it) { 1366 if (!*it) { 1367 // An expression such as 'member(arg ?: "")' may trigger this. 1368 continue; 1369 } 1370 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1371 return true; 1372 } 1373 return false; 1374} 1375 1376MemInitResult 1377Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1378 unsigned NumArgs, SourceLocation IdLoc, 1379 SourceLocation LParenLoc, 1380 SourceLocation RParenLoc) { 1381 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1382 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1383 assert((DirectMember || IndirectMember) && 1384 "Member must be a FieldDecl or IndirectFieldDecl"); 1385 1386 if (Member->isInvalidDecl()) 1387 return true; 1388 1389 // Diagnose value-uses of fields to initialize themselves, e.g. 1390 // foo(foo) 1391 // where foo is not also a parameter to the constructor. 1392 // TODO: implement -Wuninitialized and fold this into that framework. 1393 for (unsigned i = 0; i < NumArgs; ++i) { 1394 SourceLocation L; 1395 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1396 // FIXME: Return true in the case when other fields are used before being 1397 // uninitialized. For example, let this field be the i'th field. When 1398 // initializing the i'th field, throw a warning if any of the >= i'th 1399 // fields are used, as they are not yet initialized. 1400 // Right now we are only handling the case where the i'th field uses 1401 // itself in its initializer. 1402 Diag(L, diag::warn_field_is_uninit); 1403 } 1404 } 1405 1406 bool HasDependentArg = false; 1407 for (unsigned i = 0; i < NumArgs; i++) 1408 HasDependentArg |= Args[i]->isTypeDependent(); 1409 1410 Expr *Init; 1411 if (Member->getType()->isDependentType() || HasDependentArg) { 1412 // Can't check initialization for a member of dependent type or when 1413 // any of the arguments are type-dependent expressions. 1414 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc); 1416 1417 // Erase any temporaries within this evaluation context; we're not 1418 // going to track them in the AST, since we'll be rebuilding the 1419 // ASTs during template instantiation. 1420 ExprTemporaries.erase( 1421 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1422 ExprTemporaries.end()); 1423 } else { 1424 // Initialize the member. 1425 InitializedEntity MemberEntity = 1426 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1427 : InitializedEntity::InitializeMember(IndirectMember, 0); 1428 InitializationKind Kind = 1429 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1430 1431 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1432 1433 ExprResult MemberInit = 1434 InitSeq.Perform(*this, MemberEntity, Kind, 1435 MultiExprArg(*this, Args, NumArgs), 0); 1436 if (MemberInit.isInvalid()) 1437 return true; 1438 1439 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1440 1441 // C++0x [class.base.init]p7: 1442 // The initialization of each base and member constitutes a 1443 // full-expression. 1444 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1445 if (MemberInit.isInvalid()) 1446 return true; 1447 1448 // If we are in a dependent context, template instantiation will 1449 // perform this type-checking again. Just save the arguments that we 1450 // received in a ParenListExpr. 1451 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1452 // of the information that we have about the member 1453 // initializer. However, deconstructing the ASTs is a dicey process, 1454 // and this approach is far more likely to get the corner cases right. 1455 if (CurContext->isDependentContext()) 1456 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1457 RParenLoc); 1458 else 1459 Init = MemberInit.get(); 1460 } 1461 1462 if (DirectMember) { 1463 return new (Context) CXXCtorInitializer(Context, DirectMember, 1464 IdLoc, LParenLoc, Init, 1465 RParenLoc); 1466 } else { 1467 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1468 IdLoc, LParenLoc, Init, 1469 RParenLoc); 1470 } 1471} 1472 1473MemInitResult 1474Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1475 Expr **Args, unsigned NumArgs, 1476 SourceLocation LParenLoc, 1477 SourceLocation RParenLoc, 1478 CXXRecordDecl *ClassDecl, 1479 SourceLocation EllipsisLoc) { 1480 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1481 if (!LangOpts.CPlusPlus0x) 1482 return Diag(Loc, diag::err_delegation_0x_only) 1483 << TInfo->getTypeLoc().getLocalSourceRange(); 1484 1485 return Diag(Loc, diag::err_delegation_unimplemented) 1486 << TInfo->getTypeLoc().getLocalSourceRange(); 1487} 1488 1489MemInitResult 1490Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1491 Expr **Args, unsigned NumArgs, 1492 SourceLocation LParenLoc, SourceLocation RParenLoc, 1493 CXXRecordDecl *ClassDecl, 1494 SourceLocation EllipsisLoc) { 1495 bool HasDependentArg = false; 1496 for (unsigned i = 0; i < NumArgs; i++) 1497 HasDependentArg |= Args[i]->isTypeDependent(); 1498 1499 SourceLocation BaseLoc 1500 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1501 1502 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1503 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1504 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1505 1506 // C++ [class.base.init]p2: 1507 // [...] Unless the mem-initializer-id names a nonstatic data 1508 // member of the constructor's class or a direct or virtual base 1509 // of that class, the mem-initializer is ill-formed. A 1510 // mem-initializer-list can initialize a base class using any 1511 // name that denotes that base class type. 1512 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1513 1514 if (EllipsisLoc.isValid()) { 1515 // This is a pack expansion. 1516 if (!BaseType->containsUnexpandedParameterPack()) { 1517 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1518 << SourceRange(BaseLoc, RParenLoc); 1519 1520 EllipsisLoc = SourceLocation(); 1521 } 1522 } else { 1523 // Check for any unexpanded parameter packs. 1524 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1525 return true; 1526 1527 for (unsigned I = 0; I != NumArgs; ++I) 1528 if (DiagnoseUnexpandedParameterPack(Args[I])) 1529 return true; 1530 } 1531 1532 // Check for direct and virtual base classes. 1533 const CXXBaseSpecifier *DirectBaseSpec = 0; 1534 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1535 if (!Dependent) { 1536 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1537 BaseType)) 1538 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, 1539 LParenLoc, RParenLoc, ClassDecl, 1540 EllipsisLoc); 1541 1542 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1543 VirtualBaseSpec); 1544 1545 // C++ [base.class.init]p2: 1546 // Unless the mem-initializer-id names a nonstatic data member of the 1547 // constructor's class or a direct or virtual base of that class, the 1548 // mem-initializer is ill-formed. 1549 if (!DirectBaseSpec && !VirtualBaseSpec) { 1550 // If the class has any dependent bases, then it's possible that 1551 // one of those types will resolve to the same type as 1552 // BaseType. Therefore, just treat this as a dependent base 1553 // class initialization. FIXME: Should we try to check the 1554 // initialization anyway? It seems odd. 1555 if (ClassDecl->hasAnyDependentBases()) 1556 Dependent = true; 1557 else 1558 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1559 << BaseType << Context.getTypeDeclType(ClassDecl) 1560 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1561 } 1562 } 1563 1564 if (Dependent) { 1565 // Can't check initialization for a base of dependent type or when 1566 // any of the arguments are type-dependent expressions. 1567 ExprResult BaseInit 1568 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1569 RParenLoc)); 1570 1571 // Erase any temporaries within this evaluation context; we're not 1572 // going to track them in the AST, since we'll be rebuilding the 1573 // ASTs during template instantiation. 1574 ExprTemporaries.erase( 1575 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1576 ExprTemporaries.end()); 1577 1578 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1579 /*IsVirtual=*/false, 1580 LParenLoc, 1581 BaseInit.takeAs<Expr>(), 1582 RParenLoc, 1583 EllipsisLoc); 1584 } 1585 1586 // C++ [base.class.init]p2: 1587 // If a mem-initializer-id is ambiguous because it designates both 1588 // a direct non-virtual base class and an inherited virtual base 1589 // class, the mem-initializer is ill-formed. 1590 if (DirectBaseSpec && VirtualBaseSpec) 1591 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1592 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1593 1594 CXXBaseSpecifier *BaseSpec 1595 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1596 if (!BaseSpec) 1597 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1598 1599 // Initialize the base. 1600 InitializedEntity BaseEntity = 1601 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1602 InitializationKind Kind = 1603 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1604 1605 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1606 1607 ExprResult BaseInit = 1608 InitSeq.Perform(*this, BaseEntity, Kind, 1609 MultiExprArg(*this, Args, NumArgs), 0); 1610 if (BaseInit.isInvalid()) 1611 return true; 1612 1613 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1614 1615 // C++0x [class.base.init]p7: 1616 // The initialization of each base and member constitutes a 1617 // full-expression. 1618 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1619 if (BaseInit.isInvalid()) 1620 return true; 1621 1622 // If we are in a dependent context, template instantiation will 1623 // perform this type-checking again. Just save the arguments that we 1624 // received in a ParenListExpr. 1625 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1626 // of the information that we have about the base 1627 // initializer. However, deconstructing the ASTs is a dicey process, 1628 // and this approach is far more likely to get the corner cases right. 1629 if (CurContext->isDependentContext()) { 1630 ExprResult Init 1631 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1632 RParenLoc)); 1633 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1634 BaseSpec->isVirtual(), 1635 LParenLoc, 1636 Init.takeAs<Expr>(), 1637 RParenLoc, 1638 EllipsisLoc); 1639 } 1640 1641 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1642 BaseSpec->isVirtual(), 1643 LParenLoc, 1644 BaseInit.takeAs<Expr>(), 1645 RParenLoc, 1646 EllipsisLoc); 1647} 1648 1649/// ImplicitInitializerKind - How an implicit base or member initializer should 1650/// initialize its base or member. 1651enum ImplicitInitializerKind { 1652 IIK_Default, 1653 IIK_Copy, 1654 IIK_Move 1655}; 1656 1657static bool 1658BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1659 ImplicitInitializerKind ImplicitInitKind, 1660 CXXBaseSpecifier *BaseSpec, 1661 bool IsInheritedVirtualBase, 1662 CXXCtorInitializer *&CXXBaseInit) { 1663 InitializedEntity InitEntity 1664 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1665 IsInheritedVirtualBase); 1666 1667 ExprResult BaseInit; 1668 1669 switch (ImplicitInitKind) { 1670 case IIK_Default: { 1671 InitializationKind InitKind 1672 = InitializationKind::CreateDefault(Constructor->getLocation()); 1673 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1674 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1675 MultiExprArg(SemaRef, 0, 0)); 1676 break; 1677 } 1678 1679 case IIK_Copy: { 1680 ParmVarDecl *Param = Constructor->getParamDecl(0); 1681 QualType ParamType = Param->getType().getNonReferenceType(); 1682 1683 Expr *CopyCtorArg = 1684 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1685 Constructor->getLocation(), ParamType, 1686 VK_LValue, 0); 1687 1688 // Cast to the base class to avoid ambiguities. 1689 QualType ArgTy = 1690 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1691 ParamType.getQualifiers()); 1692 1693 CXXCastPath BasePath; 1694 BasePath.push_back(BaseSpec); 1695 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1696 CK_UncheckedDerivedToBase, 1697 VK_LValue, &BasePath); 1698 1699 InitializationKind InitKind 1700 = InitializationKind::CreateDirect(Constructor->getLocation(), 1701 SourceLocation(), SourceLocation()); 1702 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1703 &CopyCtorArg, 1); 1704 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1705 MultiExprArg(&CopyCtorArg, 1)); 1706 break; 1707 } 1708 1709 case IIK_Move: 1710 assert(false && "Unhandled initializer kind!"); 1711 } 1712 1713 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1714 if (BaseInit.isInvalid()) 1715 return true; 1716 1717 CXXBaseInit = 1718 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1719 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1720 SourceLocation()), 1721 BaseSpec->isVirtual(), 1722 SourceLocation(), 1723 BaseInit.takeAs<Expr>(), 1724 SourceLocation(), 1725 SourceLocation()); 1726 1727 return false; 1728} 1729 1730static bool 1731BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1732 ImplicitInitializerKind ImplicitInitKind, 1733 FieldDecl *Field, 1734 CXXCtorInitializer *&CXXMemberInit) { 1735 if (Field->isInvalidDecl()) 1736 return true; 1737 1738 SourceLocation Loc = Constructor->getLocation(); 1739 1740 if (ImplicitInitKind == IIK_Copy) { 1741 ParmVarDecl *Param = Constructor->getParamDecl(0); 1742 QualType ParamType = Param->getType().getNonReferenceType(); 1743 1744 Expr *MemberExprBase = 1745 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1746 Loc, ParamType, VK_LValue, 0); 1747 1748 // Build a reference to this field within the parameter. 1749 CXXScopeSpec SS; 1750 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1751 Sema::LookupMemberName); 1752 MemberLookup.addDecl(Field, AS_public); 1753 MemberLookup.resolveKind(); 1754 ExprResult CopyCtorArg 1755 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1756 ParamType, Loc, 1757 /*IsArrow=*/false, 1758 SS, 1759 /*FirstQualifierInScope=*/0, 1760 MemberLookup, 1761 /*TemplateArgs=*/0); 1762 if (CopyCtorArg.isInvalid()) 1763 return true; 1764 1765 // When the field we are copying is an array, create index variables for 1766 // each dimension of the array. We use these index variables to subscript 1767 // the source array, and other clients (e.g., CodeGen) will perform the 1768 // necessary iteration with these index variables. 1769 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1770 QualType BaseType = Field->getType(); 1771 QualType SizeType = SemaRef.Context.getSizeType(); 1772 while (const ConstantArrayType *Array 1773 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1774 // Create the iteration variable for this array index. 1775 IdentifierInfo *IterationVarName = 0; 1776 { 1777 llvm::SmallString<8> Str; 1778 llvm::raw_svector_ostream OS(Str); 1779 OS << "__i" << IndexVariables.size(); 1780 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1781 } 1782 VarDecl *IterationVar 1783 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1784 IterationVarName, SizeType, 1785 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1786 SC_None, SC_None); 1787 IndexVariables.push_back(IterationVar); 1788 1789 // Create a reference to the iteration variable. 1790 ExprResult IterationVarRef 1791 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1792 assert(!IterationVarRef.isInvalid() && 1793 "Reference to invented variable cannot fail!"); 1794 1795 // Subscript the array with this iteration variable. 1796 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1797 Loc, 1798 IterationVarRef.take(), 1799 Loc); 1800 if (CopyCtorArg.isInvalid()) 1801 return true; 1802 1803 BaseType = Array->getElementType(); 1804 } 1805 1806 // Construct the entity that we will be initializing. For an array, this 1807 // will be first element in the array, which may require several levels 1808 // of array-subscript entities. 1809 llvm::SmallVector<InitializedEntity, 4> Entities; 1810 Entities.reserve(1 + IndexVariables.size()); 1811 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1812 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1813 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1814 0, 1815 Entities.back())); 1816 1817 // Direct-initialize to use the copy constructor. 1818 InitializationKind InitKind = 1819 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1820 1821 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1822 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1823 &CopyCtorArgE, 1); 1824 1825 ExprResult MemberInit 1826 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1827 MultiExprArg(&CopyCtorArgE, 1)); 1828 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1829 if (MemberInit.isInvalid()) 1830 return true; 1831 1832 CXXMemberInit 1833 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1834 MemberInit.takeAs<Expr>(), Loc, 1835 IndexVariables.data(), 1836 IndexVariables.size()); 1837 return false; 1838 } 1839 1840 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1841 1842 QualType FieldBaseElementType = 1843 SemaRef.Context.getBaseElementType(Field->getType()); 1844 1845 if (FieldBaseElementType->isRecordType()) { 1846 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1847 InitializationKind InitKind = 1848 InitializationKind::CreateDefault(Loc); 1849 1850 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1851 ExprResult MemberInit = 1852 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1853 1854 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1855 if (MemberInit.isInvalid()) 1856 return true; 1857 1858 CXXMemberInit = 1859 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1860 Field, Loc, Loc, 1861 MemberInit.get(), 1862 Loc); 1863 return false; 1864 } 1865 1866 if (FieldBaseElementType->isReferenceType()) { 1867 SemaRef.Diag(Constructor->getLocation(), 1868 diag::err_uninitialized_member_in_ctor) 1869 << (int)Constructor->isImplicit() 1870 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1871 << 0 << Field->getDeclName(); 1872 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1873 return true; 1874 } 1875 1876 if (FieldBaseElementType.isConstQualified()) { 1877 SemaRef.Diag(Constructor->getLocation(), 1878 diag::err_uninitialized_member_in_ctor) 1879 << (int)Constructor->isImplicit() 1880 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1881 << 1 << Field->getDeclName(); 1882 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1883 return true; 1884 } 1885 1886 // Nothing to initialize. 1887 CXXMemberInit = 0; 1888 return false; 1889} 1890 1891namespace { 1892struct BaseAndFieldInfo { 1893 Sema &S; 1894 CXXConstructorDecl *Ctor; 1895 bool AnyErrorsInInits; 1896 ImplicitInitializerKind IIK; 1897 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1898 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1899 1900 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1901 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1902 // FIXME: Handle implicit move constructors. 1903 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1904 IIK = IIK_Copy; 1905 else 1906 IIK = IIK_Default; 1907 } 1908}; 1909} 1910 1911static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1912 FieldDecl *Top, FieldDecl *Field) { 1913 1914 // Overwhelmingly common case: we have a direct initializer for this field. 1915 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1916 Info.AllToInit.push_back(Init); 1917 return false; 1918 } 1919 1920 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1921 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1922 assert(FieldClassType && "anonymous struct/union without record type"); 1923 CXXRecordDecl *FieldClassDecl 1924 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1925 1926 // Even though union members never have non-trivial default 1927 // constructions in C++03, we still build member initializers for aggregate 1928 // record types which can be union members, and C++0x allows non-trivial 1929 // default constructors for union members, so we ensure that only one 1930 // member is initialized for these. 1931 if (FieldClassDecl->isUnion()) { 1932 // First check for an explicit initializer for one field. 1933 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1934 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1935 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1936 Info.AllToInit.push_back(Init); 1937 1938 // Once we've initialized a field of an anonymous union, the union 1939 // field in the class is also initialized, so exit immediately. 1940 return false; 1941 } else if ((*FA)->isAnonymousStructOrUnion()) { 1942 if (CollectFieldInitializer(Info, Top, *FA)) 1943 return true; 1944 } 1945 } 1946 1947 // Fallthrough and construct a default initializer for the union as 1948 // a whole, which can call its default constructor if such a thing exists 1949 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1950 // behavior going forward with C++0x, when anonymous unions there are 1951 // finalized, we should revisit this. 1952 } else { 1953 // For structs, we simply descend through to initialize all members where 1954 // necessary. 1955 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1956 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1957 if (CollectFieldInitializer(Info, Top, *FA)) 1958 return true; 1959 } 1960 } 1961 } 1962 1963 // Don't try to build an implicit initializer if there were semantic 1964 // errors in any of the initializers (and therefore we might be 1965 // missing some that the user actually wrote). 1966 if (Info.AnyErrorsInInits) 1967 return false; 1968 1969 CXXCtorInitializer *Init = 0; 1970 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1971 return true; 1972 1973 if (Init) 1974 Info.AllToInit.push_back(Init); 1975 1976 return false; 1977} 1978 1979bool 1980Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 1981 CXXCtorInitializer **Initializers, 1982 unsigned NumInitializers, 1983 bool AnyErrors) { 1984 if (Constructor->getDeclContext()->isDependentContext()) { 1985 // Just store the initializers as written, they will be checked during 1986 // instantiation. 1987 if (NumInitializers > 0) { 1988 Constructor->setNumCtorInitializers(NumInitializers); 1989 CXXCtorInitializer **baseOrMemberInitializers = 1990 new (Context) CXXCtorInitializer*[NumInitializers]; 1991 memcpy(baseOrMemberInitializers, Initializers, 1992 NumInitializers * sizeof(CXXCtorInitializer*)); 1993 Constructor->setCtorInitializers(baseOrMemberInitializers); 1994 } 1995 1996 return false; 1997 } 1998 1999 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2000 2001 // We need to build the initializer AST according to order of construction 2002 // and not what user specified in the Initializers list. 2003 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2004 if (!ClassDecl) 2005 return true; 2006 2007 bool HadError = false; 2008 2009 for (unsigned i = 0; i < NumInitializers; i++) { 2010 CXXCtorInitializer *Member = Initializers[i]; 2011 2012 if (Member->isBaseInitializer()) 2013 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2014 else 2015 Info.AllBaseFields[Member->getAnyMember()] = Member; 2016 } 2017 2018 // Keep track of the direct virtual bases. 2019 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2020 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2021 E = ClassDecl->bases_end(); I != E; ++I) { 2022 if (I->isVirtual()) 2023 DirectVBases.insert(I); 2024 } 2025 2026 // Push virtual bases before others. 2027 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2028 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2029 2030 if (CXXCtorInitializer *Value 2031 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2032 Info.AllToInit.push_back(Value); 2033 } else if (!AnyErrors) { 2034 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2035 CXXCtorInitializer *CXXBaseInit; 2036 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2037 VBase, IsInheritedVirtualBase, 2038 CXXBaseInit)) { 2039 HadError = true; 2040 continue; 2041 } 2042 2043 Info.AllToInit.push_back(CXXBaseInit); 2044 } 2045 } 2046 2047 // Non-virtual bases. 2048 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2049 E = ClassDecl->bases_end(); Base != E; ++Base) { 2050 // Virtuals are in the virtual base list and already constructed. 2051 if (Base->isVirtual()) 2052 continue; 2053 2054 if (CXXCtorInitializer *Value 2055 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2056 Info.AllToInit.push_back(Value); 2057 } else if (!AnyErrors) { 2058 CXXCtorInitializer *CXXBaseInit; 2059 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2060 Base, /*IsInheritedVirtualBase=*/false, 2061 CXXBaseInit)) { 2062 HadError = true; 2063 continue; 2064 } 2065 2066 Info.AllToInit.push_back(CXXBaseInit); 2067 } 2068 } 2069 2070 // Fields. 2071 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2072 E = ClassDecl->field_end(); Field != E; ++Field) { 2073 if ((*Field)->getType()->isIncompleteArrayType()) { 2074 assert(ClassDecl->hasFlexibleArrayMember() && 2075 "Incomplete array type is not valid"); 2076 continue; 2077 } 2078 if (CollectFieldInitializer(Info, *Field, *Field)) 2079 HadError = true; 2080 } 2081 2082 NumInitializers = Info.AllToInit.size(); 2083 if (NumInitializers > 0) { 2084 Constructor->setNumCtorInitializers(NumInitializers); 2085 CXXCtorInitializer **baseOrMemberInitializers = 2086 new (Context) CXXCtorInitializer*[NumInitializers]; 2087 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2088 NumInitializers * sizeof(CXXCtorInitializer*)); 2089 Constructor->setCtorInitializers(baseOrMemberInitializers); 2090 2091 // Constructors implicitly reference the base and member 2092 // destructors. 2093 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2094 Constructor->getParent()); 2095 } 2096 2097 return HadError; 2098} 2099 2100static void *GetKeyForTopLevelField(FieldDecl *Field) { 2101 // For anonymous unions, use the class declaration as the key. 2102 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2103 if (RT->getDecl()->isAnonymousStructOrUnion()) 2104 return static_cast<void *>(RT->getDecl()); 2105 } 2106 return static_cast<void *>(Field); 2107} 2108 2109static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2110 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2111} 2112 2113static void *GetKeyForMember(ASTContext &Context, 2114 CXXCtorInitializer *Member) { 2115 if (!Member->isAnyMemberInitializer()) 2116 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2117 2118 // For fields injected into the class via declaration of an anonymous union, 2119 // use its anonymous union class declaration as the unique key. 2120 FieldDecl *Field = Member->getAnyMember(); 2121 2122 // If the field is a member of an anonymous struct or union, our key 2123 // is the anonymous record decl that's a direct child of the class. 2124 RecordDecl *RD = Field->getParent(); 2125 if (RD->isAnonymousStructOrUnion()) { 2126 while (true) { 2127 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2128 if (Parent->isAnonymousStructOrUnion()) 2129 RD = Parent; 2130 else 2131 break; 2132 } 2133 2134 return static_cast<void *>(RD); 2135 } 2136 2137 return static_cast<void *>(Field); 2138} 2139 2140static void 2141DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2142 const CXXConstructorDecl *Constructor, 2143 CXXCtorInitializer **Inits, 2144 unsigned NumInits) { 2145 if (Constructor->getDeclContext()->isDependentContext()) 2146 return; 2147 2148 // Don't check initializers order unless the warning is enabled at the 2149 // location of at least one initializer. 2150 bool ShouldCheckOrder = false; 2151 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2152 CXXCtorInitializer *Init = Inits[InitIndex]; 2153 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2154 Init->getSourceLocation()) 2155 != Diagnostic::Ignored) { 2156 ShouldCheckOrder = true; 2157 break; 2158 } 2159 } 2160 if (!ShouldCheckOrder) 2161 return; 2162 2163 // Build the list of bases and members in the order that they'll 2164 // actually be initialized. The explicit initializers should be in 2165 // this same order but may be missing things. 2166 llvm::SmallVector<const void*, 32> IdealInitKeys; 2167 2168 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2169 2170 // 1. Virtual bases. 2171 for (CXXRecordDecl::base_class_const_iterator VBase = 2172 ClassDecl->vbases_begin(), 2173 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2174 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2175 2176 // 2. Non-virtual bases. 2177 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2178 E = ClassDecl->bases_end(); Base != E; ++Base) { 2179 if (Base->isVirtual()) 2180 continue; 2181 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2182 } 2183 2184 // 3. Direct fields. 2185 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2186 E = ClassDecl->field_end(); Field != E; ++Field) 2187 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2188 2189 unsigned NumIdealInits = IdealInitKeys.size(); 2190 unsigned IdealIndex = 0; 2191 2192 CXXCtorInitializer *PrevInit = 0; 2193 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2194 CXXCtorInitializer *Init = Inits[InitIndex]; 2195 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2196 2197 // Scan forward to try to find this initializer in the idealized 2198 // initializers list. 2199 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2200 if (InitKey == IdealInitKeys[IdealIndex]) 2201 break; 2202 2203 // If we didn't find this initializer, it must be because we 2204 // scanned past it on a previous iteration. That can only 2205 // happen if we're out of order; emit a warning. 2206 if (IdealIndex == NumIdealInits && PrevInit) { 2207 Sema::SemaDiagnosticBuilder D = 2208 SemaRef.Diag(PrevInit->getSourceLocation(), 2209 diag::warn_initializer_out_of_order); 2210 2211 if (PrevInit->isAnyMemberInitializer()) 2212 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2213 else 2214 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2215 2216 if (Init->isAnyMemberInitializer()) 2217 D << 0 << Init->getAnyMember()->getDeclName(); 2218 else 2219 D << 1 << Init->getBaseClassInfo()->getType(); 2220 2221 // Move back to the initializer's location in the ideal list. 2222 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2223 if (InitKey == IdealInitKeys[IdealIndex]) 2224 break; 2225 2226 assert(IdealIndex != NumIdealInits && 2227 "initializer not found in initializer list"); 2228 } 2229 2230 PrevInit = Init; 2231 } 2232} 2233 2234namespace { 2235bool CheckRedundantInit(Sema &S, 2236 CXXCtorInitializer *Init, 2237 CXXCtorInitializer *&PrevInit) { 2238 if (!PrevInit) { 2239 PrevInit = Init; 2240 return false; 2241 } 2242 2243 if (FieldDecl *Field = Init->getMember()) 2244 S.Diag(Init->getSourceLocation(), 2245 diag::err_multiple_mem_initialization) 2246 << Field->getDeclName() 2247 << Init->getSourceRange(); 2248 else { 2249 const Type *BaseClass = Init->getBaseClass(); 2250 assert(BaseClass && "neither field nor base"); 2251 S.Diag(Init->getSourceLocation(), 2252 diag::err_multiple_base_initialization) 2253 << QualType(BaseClass, 0) 2254 << Init->getSourceRange(); 2255 } 2256 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2257 << 0 << PrevInit->getSourceRange(); 2258 2259 return true; 2260} 2261 2262typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2263typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2264 2265bool CheckRedundantUnionInit(Sema &S, 2266 CXXCtorInitializer *Init, 2267 RedundantUnionMap &Unions) { 2268 FieldDecl *Field = Init->getAnyMember(); 2269 RecordDecl *Parent = Field->getParent(); 2270 if (!Parent->isAnonymousStructOrUnion()) 2271 return false; 2272 2273 NamedDecl *Child = Field; 2274 do { 2275 if (Parent->isUnion()) { 2276 UnionEntry &En = Unions[Parent]; 2277 if (En.first && En.first != Child) { 2278 S.Diag(Init->getSourceLocation(), 2279 diag::err_multiple_mem_union_initialization) 2280 << Field->getDeclName() 2281 << Init->getSourceRange(); 2282 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2283 << 0 << En.second->getSourceRange(); 2284 return true; 2285 } else if (!En.first) { 2286 En.first = Child; 2287 En.second = Init; 2288 } 2289 } 2290 2291 Child = Parent; 2292 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2293 } while (Parent->isAnonymousStructOrUnion()); 2294 2295 return false; 2296} 2297} 2298 2299/// ActOnMemInitializers - Handle the member initializers for a constructor. 2300void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2301 SourceLocation ColonLoc, 2302 MemInitTy **meminits, unsigned NumMemInits, 2303 bool AnyErrors) { 2304 if (!ConstructorDecl) 2305 return; 2306 2307 AdjustDeclIfTemplate(ConstructorDecl); 2308 2309 CXXConstructorDecl *Constructor 2310 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2311 2312 if (!Constructor) { 2313 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2314 return; 2315 } 2316 2317 CXXCtorInitializer **MemInits = 2318 reinterpret_cast<CXXCtorInitializer **>(meminits); 2319 2320 // Mapping for the duplicate initializers check. 2321 // For member initializers, this is keyed with a FieldDecl*. 2322 // For base initializers, this is keyed with a Type*. 2323 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2324 2325 // Mapping for the inconsistent anonymous-union initializers check. 2326 RedundantUnionMap MemberUnions; 2327 2328 bool HadError = false; 2329 for (unsigned i = 0; i < NumMemInits; i++) { 2330 CXXCtorInitializer *Init = MemInits[i]; 2331 2332 // Set the source order index. 2333 Init->setSourceOrder(i); 2334 2335 if (Init->isAnyMemberInitializer()) { 2336 FieldDecl *Field = Init->getAnyMember(); 2337 if (CheckRedundantInit(*this, Init, Members[Field]) || 2338 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2339 HadError = true; 2340 } else { 2341 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2342 if (CheckRedundantInit(*this, Init, Members[Key])) 2343 HadError = true; 2344 } 2345 } 2346 2347 if (HadError) 2348 return; 2349 2350 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2351 2352 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2353} 2354 2355void 2356Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2357 CXXRecordDecl *ClassDecl) { 2358 // Ignore dependent contexts. 2359 if (ClassDecl->isDependentContext()) 2360 return; 2361 2362 // FIXME: all the access-control diagnostics are positioned on the 2363 // field/base declaration. That's probably good; that said, the 2364 // user might reasonably want to know why the destructor is being 2365 // emitted, and we currently don't say. 2366 2367 // Non-static data members. 2368 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2369 E = ClassDecl->field_end(); I != E; ++I) { 2370 FieldDecl *Field = *I; 2371 if (Field->isInvalidDecl()) 2372 continue; 2373 QualType FieldType = Context.getBaseElementType(Field->getType()); 2374 2375 const RecordType* RT = FieldType->getAs<RecordType>(); 2376 if (!RT) 2377 continue; 2378 2379 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2380 if (FieldClassDecl->hasTrivialDestructor()) 2381 continue; 2382 2383 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2384 CheckDestructorAccess(Field->getLocation(), Dtor, 2385 PDiag(diag::err_access_dtor_field) 2386 << Field->getDeclName() 2387 << FieldType); 2388 2389 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2390 } 2391 2392 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2393 2394 // Bases. 2395 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2396 E = ClassDecl->bases_end(); Base != E; ++Base) { 2397 // Bases are always records in a well-formed non-dependent class. 2398 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2399 2400 // Remember direct virtual bases. 2401 if (Base->isVirtual()) 2402 DirectVirtualBases.insert(RT); 2403 2404 // Ignore trivial destructors. 2405 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2406 if (BaseClassDecl->hasTrivialDestructor()) 2407 continue; 2408 2409 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2410 2411 // FIXME: caret should be on the start of the class name 2412 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2413 PDiag(diag::err_access_dtor_base) 2414 << Base->getType() 2415 << Base->getSourceRange()); 2416 2417 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2418 } 2419 2420 // Virtual bases. 2421 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2422 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2423 2424 // Bases are always records in a well-formed non-dependent class. 2425 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2426 2427 // Ignore direct virtual bases. 2428 if (DirectVirtualBases.count(RT)) 2429 continue; 2430 2431 // Ignore trivial destructors. 2432 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2433 if (BaseClassDecl->hasTrivialDestructor()) 2434 continue; 2435 2436 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2437 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2438 PDiag(diag::err_access_dtor_vbase) 2439 << VBase->getType()); 2440 2441 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2442 } 2443} 2444 2445void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2446 if (!CDtorDecl) 2447 return; 2448 2449 if (CXXConstructorDecl *Constructor 2450 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2451 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2452} 2453 2454bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2455 unsigned DiagID, AbstractDiagSelID SelID) { 2456 if (SelID == -1) 2457 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2458 else 2459 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2460} 2461 2462bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2463 const PartialDiagnostic &PD) { 2464 if (!getLangOptions().CPlusPlus) 2465 return false; 2466 2467 if (const ArrayType *AT = Context.getAsArrayType(T)) 2468 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2469 2470 if (const PointerType *PT = T->getAs<PointerType>()) { 2471 // Find the innermost pointer type. 2472 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2473 PT = T; 2474 2475 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2476 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2477 } 2478 2479 const RecordType *RT = T->getAs<RecordType>(); 2480 if (!RT) 2481 return false; 2482 2483 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2484 2485 // We can't answer whether something is abstract until it has a 2486 // definition. If it's currently being defined, we'll walk back 2487 // over all the declarations when we have a full definition. 2488 const CXXRecordDecl *Def = RD->getDefinition(); 2489 if (!Def || Def->isBeingDefined()) 2490 return false; 2491 2492 if (!RD->isAbstract()) 2493 return false; 2494 2495 Diag(Loc, PD) << RD->getDeclName(); 2496 DiagnoseAbstractType(RD); 2497 2498 return true; 2499} 2500 2501void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2502 // Check if we've already emitted the list of pure virtual functions 2503 // for this class. 2504 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2505 return; 2506 2507 CXXFinalOverriderMap FinalOverriders; 2508 RD->getFinalOverriders(FinalOverriders); 2509 2510 // Keep a set of seen pure methods so we won't diagnose the same method 2511 // more than once. 2512 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2513 2514 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2515 MEnd = FinalOverriders.end(); 2516 M != MEnd; 2517 ++M) { 2518 for (OverridingMethods::iterator SO = M->second.begin(), 2519 SOEnd = M->second.end(); 2520 SO != SOEnd; ++SO) { 2521 // C++ [class.abstract]p4: 2522 // A class is abstract if it contains or inherits at least one 2523 // pure virtual function for which the final overrider is pure 2524 // virtual. 2525 2526 // 2527 if (SO->second.size() != 1) 2528 continue; 2529 2530 if (!SO->second.front().Method->isPure()) 2531 continue; 2532 2533 if (!SeenPureMethods.insert(SO->second.front().Method)) 2534 continue; 2535 2536 Diag(SO->second.front().Method->getLocation(), 2537 diag::note_pure_virtual_function) 2538 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2539 } 2540 } 2541 2542 if (!PureVirtualClassDiagSet) 2543 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2544 PureVirtualClassDiagSet->insert(RD); 2545} 2546 2547namespace { 2548struct AbstractUsageInfo { 2549 Sema &S; 2550 CXXRecordDecl *Record; 2551 CanQualType AbstractType; 2552 bool Invalid; 2553 2554 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2555 : S(S), Record(Record), 2556 AbstractType(S.Context.getCanonicalType( 2557 S.Context.getTypeDeclType(Record))), 2558 Invalid(false) {} 2559 2560 void DiagnoseAbstractType() { 2561 if (Invalid) return; 2562 S.DiagnoseAbstractType(Record); 2563 Invalid = true; 2564 } 2565 2566 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2567}; 2568 2569struct CheckAbstractUsage { 2570 AbstractUsageInfo &Info; 2571 const NamedDecl *Ctx; 2572 2573 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2574 : Info(Info), Ctx(Ctx) {} 2575 2576 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2577 switch (TL.getTypeLocClass()) { 2578#define ABSTRACT_TYPELOC(CLASS, PARENT) 2579#define TYPELOC(CLASS, PARENT) \ 2580 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2581#include "clang/AST/TypeLocNodes.def" 2582 } 2583 } 2584 2585 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2586 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2587 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2588 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2589 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2590 } 2591 } 2592 2593 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2594 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2595 } 2596 2597 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2598 // Visit the type parameters from a permissive context. 2599 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2600 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2601 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2602 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2603 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2604 // TODO: other template argument types? 2605 } 2606 } 2607 2608 // Visit pointee types from a permissive context. 2609#define CheckPolymorphic(Type) \ 2610 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2611 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2612 } 2613 CheckPolymorphic(PointerTypeLoc) 2614 CheckPolymorphic(ReferenceTypeLoc) 2615 CheckPolymorphic(MemberPointerTypeLoc) 2616 CheckPolymorphic(BlockPointerTypeLoc) 2617 2618 /// Handle all the types we haven't given a more specific 2619 /// implementation for above. 2620 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2621 // Every other kind of type that we haven't called out already 2622 // that has an inner type is either (1) sugar or (2) contains that 2623 // inner type in some way as a subobject. 2624 if (TypeLoc Next = TL.getNextTypeLoc()) 2625 return Visit(Next, Sel); 2626 2627 // If there's no inner type and we're in a permissive context, 2628 // don't diagnose. 2629 if (Sel == Sema::AbstractNone) return; 2630 2631 // Check whether the type matches the abstract type. 2632 QualType T = TL.getType(); 2633 if (T->isArrayType()) { 2634 Sel = Sema::AbstractArrayType; 2635 T = Info.S.Context.getBaseElementType(T); 2636 } 2637 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2638 if (CT != Info.AbstractType) return; 2639 2640 // It matched; do some magic. 2641 if (Sel == Sema::AbstractArrayType) { 2642 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2643 << T << TL.getSourceRange(); 2644 } else { 2645 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2646 << Sel << T << TL.getSourceRange(); 2647 } 2648 Info.DiagnoseAbstractType(); 2649 } 2650}; 2651 2652void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2653 Sema::AbstractDiagSelID Sel) { 2654 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2655} 2656 2657} 2658 2659/// Check for invalid uses of an abstract type in a method declaration. 2660static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2661 CXXMethodDecl *MD) { 2662 // No need to do the check on definitions, which require that 2663 // the return/param types be complete. 2664 if (MD->isThisDeclarationADefinition()) 2665 return; 2666 2667 // For safety's sake, just ignore it if we don't have type source 2668 // information. This should never happen for non-implicit methods, 2669 // but... 2670 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2671 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2672} 2673 2674/// Check for invalid uses of an abstract type within a class definition. 2675static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2676 CXXRecordDecl *RD) { 2677 for (CXXRecordDecl::decl_iterator 2678 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2679 Decl *D = *I; 2680 if (D->isImplicit()) continue; 2681 2682 // Methods and method templates. 2683 if (isa<CXXMethodDecl>(D)) { 2684 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2685 } else if (isa<FunctionTemplateDecl>(D)) { 2686 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2687 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2688 2689 // Fields and static variables. 2690 } else if (isa<FieldDecl>(D)) { 2691 FieldDecl *FD = cast<FieldDecl>(D); 2692 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2693 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2694 } else if (isa<VarDecl>(D)) { 2695 VarDecl *VD = cast<VarDecl>(D); 2696 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2697 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2698 2699 // Nested classes and class templates. 2700 } else if (isa<CXXRecordDecl>(D)) { 2701 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2702 } else if (isa<ClassTemplateDecl>(D)) { 2703 CheckAbstractClassUsage(Info, 2704 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2705 } 2706 } 2707} 2708 2709/// \brief Perform semantic checks on a class definition that has been 2710/// completing, introducing implicitly-declared members, checking for 2711/// abstract types, etc. 2712void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2713 if (!Record) 2714 return; 2715 2716 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2717 AbstractUsageInfo Info(*this, Record); 2718 CheckAbstractClassUsage(Info, Record); 2719 } 2720 2721 // If this is not an aggregate type and has no user-declared constructor, 2722 // complain about any non-static data members of reference or const scalar 2723 // type, since they will never get initializers. 2724 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2725 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2726 bool Complained = false; 2727 for (RecordDecl::field_iterator F = Record->field_begin(), 2728 FEnd = Record->field_end(); 2729 F != FEnd; ++F) { 2730 if (F->getType()->isReferenceType() || 2731 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2732 if (!Complained) { 2733 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2734 << Record->getTagKind() << Record; 2735 Complained = true; 2736 } 2737 2738 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2739 << F->getType()->isReferenceType() 2740 << F->getDeclName(); 2741 } 2742 } 2743 } 2744 2745 if (Record->isDynamicClass() && !Record->isDependentType()) 2746 DynamicClasses.push_back(Record); 2747 2748 if (Record->getIdentifier()) { 2749 // C++ [class.mem]p13: 2750 // If T is the name of a class, then each of the following shall have a 2751 // name different from T: 2752 // - every member of every anonymous union that is a member of class T. 2753 // 2754 // C++ [class.mem]p14: 2755 // In addition, if class T has a user-declared constructor (12.1), every 2756 // non-static data member of class T shall have a name different from T. 2757 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2758 R.first != R.second; ++R.first) { 2759 NamedDecl *D = *R.first; 2760 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2761 isa<IndirectFieldDecl>(D)) { 2762 Diag(D->getLocation(), diag::err_member_name_of_class) 2763 << D->getDeclName(); 2764 break; 2765 } 2766 } 2767 } 2768 2769 // Warn if the class has virtual methods but non-virtual public destructor. 2770 if (Record->isPolymorphic() && !Record->isDependentType()) { 2771 CXXDestructorDecl *dtor = Record->getDestructor(); 2772 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2773 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2774 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2775 } 2776 2777 // See if a method overloads virtual methods in a base 2778 /// class without overriding any. 2779 if (!Record->isDependentType()) { 2780 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2781 MEnd = Record->method_end(); 2782 M != MEnd; ++M) { 2783 DiagnoseHiddenVirtualMethods(Record, *M); 2784 } 2785 } 2786 2787 // Declare inherited constructors. We do this eagerly here because: 2788 // - The standard requires an eager diagnostic for conflicting inherited 2789 // constructors from different classes. 2790 // - The lazy declaration of the other implicit constructors is so as to not 2791 // waste space and performance on classes that are not meant to be 2792 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2793 // have inherited constructors. 2794 DeclareInheritedConstructors(Record); 2795} 2796 2797/// \brief Data used with FindHiddenVirtualMethod 2798struct FindHiddenVirtualMethodData { 2799 Sema *S; 2800 CXXMethodDecl *Method; 2801 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2802 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2803}; 2804 2805/// \brief Member lookup function that determines whether a given C++ 2806/// method overloads virtual methods in a base class without overriding any, 2807/// to be used with CXXRecordDecl::lookupInBases(). 2808static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2809 CXXBasePath &Path, 2810 void *UserData) { 2811 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2812 2813 FindHiddenVirtualMethodData &Data 2814 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2815 2816 DeclarationName Name = Data.Method->getDeclName(); 2817 assert(Name.getNameKind() == DeclarationName::Identifier); 2818 2819 bool foundSameNameMethod = false; 2820 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2821 for (Path.Decls = BaseRecord->lookup(Name); 2822 Path.Decls.first != Path.Decls.second; 2823 ++Path.Decls.first) { 2824 NamedDecl *D = *Path.Decls.first; 2825 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2826 MD = MD->getCanonicalDecl(); 2827 foundSameNameMethod = true; 2828 // Interested only in hidden virtual methods. 2829 if (!MD->isVirtual()) 2830 continue; 2831 // If the method we are checking overrides a method from its base 2832 // don't warn about the other overloaded methods. 2833 if (!Data.S->IsOverload(Data.Method, MD, false)) 2834 return true; 2835 // Collect the overload only if its hidden. 2836 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2837 overloadedMethods.push_back(MD); 2838 } 2839 } 2840 2841 if (foundSameNameMethod) 2842 Data.OverloadedMethods.append(overloadedMethods.begin(), 2843 overloadedMethods.end()); 2844 return foundSameNameMethod; 2845} 2846 2847/// \brief See if a method overloads virtual methods in a base class without 2848/// overriding any. 2849void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2850 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2851 MD->getLocation()) == Diagnostic::Ignored) 2852 return; 2853 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2854 return; 2855 2856 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2857 /*bool RecordPaths=*/false, 2858 /*bool DetectVirtual=*/false); 2859 FindHiddenVirtualMethodData Data; 2860 Data.Method = MD; 2861 Data.S = this; 2862 2863 // Keep the base methods that were overriden or introduced in the subclass 2864 // by 'using' in a set. A base method not in this set is hidden. 2865 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2866 res.first != res.second; ++res.first) { 2867 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2868 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2869 E = MD->end_overridden_methods(); 2870 I != E; ++I) 2871 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2872 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2873 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2874 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2875 } 2876 2877 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2878 !Data.OverloadedMethods.empty()) { 2879 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2880 << MD << (Data.OverloadedMethods.size() > 1); 2881 2882 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2883 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2884 Diag(overloadedMD->getLocation(), 2885 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2886 } 2887 } 2888} 2889 2890void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2891 Decl *TagDecl, 2892 SourceLocation LBrac, 2893 SourceLocation RBrac, 2894 AttributeList *AttrList) { 2895 if (!TagDecl) 2896 return; 2897 2898 AdjustDeclIfTemplate(TagDecl); 2899 2900 ActOnFields(S, RLoc, TagDecl, 2901 // strict aliasing violation! 2902 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2903 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2904 2905 CheckCompletedCXXClass( 2906 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2907} 2908 2909namespace { 2910 /// \brief Helper class that collects exception specifications for 2911 /// implicitly-declared special member functions. 2912 class ImplicitExceptionSpecification { 2913 ASTContext &Context; 2914 bool AllowsAllExceptions; 2915 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2916 llvm::SmallVector<QualType, 4> Exceptions; 2917 2918 public: 2919 explicit ImplicitExceptionSpecification(ASTContext &Context) 2920 : Context(Context), AllowsAllExceptions(false) { } 2921 2922 /// \brief Whether the special member function should have any 2923 /// exception specification at all. 2924 bool hasExceptionSpecification() const { 2925 return !AllowsAllExceptions; 2926 } 2927 2928 /// \brief Whether the special member function should have a 2929 /// throw(...) exception specification (a Microsoft extension). 2930 bool hasAnyExceptionSpecification() const { 2931 return false; 2932 } 2933 2934 /// \brief The number of exceptions in the exception specification. 2935 unsigned size() const { return Exceptions.size(); } 2936 2937 /// \brief The set of exceptions in the exception specification. 2938 const QualType *data() const { return Exceptions.data(); } 2939 2940 /// \brief Note that 2941 void CalledDecl(CXXMethodDecl *Method) { 2942 // If we already know that we allow all exceptions, do nothing. 2943 if (AllowsAllExceptions || !Method) 2944 return; 2945 2946 const FunctionProtoType *Proto 2947 = Method->getType()->getAs<FunctionProtoType>(); 2948 2949 // If this function can throw any exceptions, make a note of that. 2950 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2951 AllowsAllExceptions = true; 2952 ExceptionsSeen.clear(); 2953 Exceptions.clear(); 2954 return; 2955 } 2956 2957 // Record the exceptions in this function's exception specification. 2958 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2959 EEnd = Proto->exception_end(); 2960 E != EEnd; ++E) 2961 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2962 Exceptions.push_back(*E); 2963 } 2964 }; 2965} 2966 2967 2968/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2969/// special functions, such as the default constructor, copy 2970/// constructor, or destructor, to the given C++ class (C++ 2971/// [special]p1). This routine can only be executed just before the 2972/// definition of the class is complete. 2973void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2974 if (!ClassDecl->hasUserDeclaredConstructor()) 2975 ++ASTContext::NumImplicitDefaultConstructors; 2976 2977 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2978 ++ASTContext::NumImplicitCopyConstructors; 2979 2980 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2981 ++ASTContext::NumImplicitCopyAssignmentOperators; 2982 2983 // If we have a dynamic class, then the copy assignment operator may be 2984 // virtual, so we have to declare it immediately. This ensures that, e.g., 2985 // it shows up in the right place in the vtable and that we diagnose 2986 // problems with the implicit exception specification. 2987 if (ClassDecl->isDynamicClass()) 2988 DeclareImplicitCopyAssignment(ClassDecl); 2989 } 2990 2991 if (!ClassDecl->hasUserDeclaredDestructor()) { 2992 ++ASTContext::NumImplicitDestructors; 2993 2994 // If we have a dynamic class, then the destructor may be virtual, so we 2995 // have to declare the destructor immediately. This ensures that, e.g., it 2996 // shows up in the right place in the vtable and that we diagnose problems 2997 // with the implicit exception specification. 2998 if (ClassDecl->isDynamicClass()) 2999 DeclareImplicitDestructor(ClassDecl); 3000 } 3001} 3002 3003void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3004 if (!D) 3005 return; 3006 3007 TemplateParameterList *Params = 0; 3008 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3009 Params = Template->getTemplateParameters(); 3010 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3011 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3012 Params = PartialSpec->getTemplateParameters(); 3013 else 3014 return; 3015 3016 for (TemplateParameterList::iterator Param = Params->begin(), 3017 ParamEnd = Params->end(); 3018 Param != ParamEnd; ++Param) { 3019 NamedDecl *Named = cast<NamedDecl>(*Param); 3020 if (Named->getDeclName()) { 3021 S->AddDecl(Named); 3022 IdResolver.AddDecl(Named); 3023 } 3024 } 3025} 3026 3027void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3028 if (!RecordD) return; 3029 AdjustDeclIfTemplate(RecordD); 3030 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3031 PushDeclContext(S, Record); 3032} 3033 3034void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3035 if (!RecordD) return; 3036 PopDeclContext(); 3037} 3038 3039/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3040/// parsing a top-level (non-nested) C++ class, and we are now 3041/// parsing those parts of the given Method declaration that could 3042/// not be parsed earlier (C++ [class.mem]p2), such as default 3043/// arguments. This action should enter the scope of the given 3044/// Method declaration as if we had just parsed the qualified method 3045/// name. However, it should not bring the parameters into scope; 3046/// that will be performed by ActOnDelayedCXXMethodParameter. 3047void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3048} 3049 3050/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3051/// C++ method declaration. We're (re-)introducing the given 3052/// function parameter into scope for use in parsing later parts of 3053/// the method declaration. For example, we could see an 3054/// ActOnParamDefaultArgument event for this parameter. 3055void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3056 if (!ParamD) 3057 return; 3058 3059 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3060 3061 // If this parameter has an unparsed default argument, clear it out 3062 // to make way for the parsed default argument. 3063 if (Param->hasUnparsedDefaultArg()) 3064 Param->setDefaultArg(0); 3065 3066 S->AddDecl(Param); 3067 if (Param->getDeclName()) 3068 IdResolver.AddDecl(Param); 3069} 3070 3071/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3072/// processing the delayed method declaration for Method. The method 3073/// declaration is now considered finished. There may be a separate 3074/// ActOnStartOfFunctionDef action later (not necessarily 3075/// immediately!) for this method, if it was also defined inside the 3076/// class body. 3077void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3078 if (!MethodD) 3079 return; 3080 3081 AdjustDeclIfTemplate(MethodD); 3082 3083 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3084 3085 // Now that we have our default arguments, check the constructor 3086 // again. It could produce additional diagnostics or affect whether 3087 // the class has implicitly-declared destructors, among other 3088 // things. 3089 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3090 CheckConstructor(Constructor); 3091 3092 // Check the default arguments, which we may have added. 3093 if (!Method->isInvalidDecl()) 3094 CheckCXXDefaultArguments(Method); 3095} 3096 3097/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3098/// the well-formedness of the constructor declarator @p D with type @p 3099/// R. If there are any errors in the declarator, this routine will 3100/// emit diagnostics and set the invalid bit to true. In any case, the type 3101/// will be updated to reflect a well-formed type for the constructor and 3102/// returned. 3103QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3104 StorageClass &SC) { 3105 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3106 3107 // C++ [class.ctor]p3: 3108 // A constructor shall not be virtual (10.3) or static (9.4). A 3109 // constructor can be invoked for a const, volatile or const 3110 // volatile object. A constructor shall not be declared const, 3111 // volatile, or const volatile (9.3.2). 3112 if (isVirtual) { 3113 if (!D.isInvalidType()) 3114 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3115 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3116 << SourceRange(D.getIdentifierLoc()); 3117 D.setInvalidType(); 3118 } 3119 if (SC == SC_Static) { 3120 if (!D.isInvalidType()) 3121 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3122 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3123 << SourceRange(D.getIdentifierLoc()); 3124 D.setInvalidType(); 3125 SC = SC_None; 3126 } 3127 3128 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3129 if (FTI.TypeQuals != 0) { 3130 if (FTI.TypeQuals & Qualifiers::Const) 3131 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3132 << "const" << SourceRange(D.getIdentifierLoc()); 3133 if (FTI.TypeQuals & Qualifiers::Volatile) 3134 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3135 << "volatile" << SourceRange(D.getIdentifierLoc()); 3136 if (FTI.TypeQuals & Qualifiers::Restrict) 3137 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3138 << "restrict" << SourceRange(D.getIdentifierLoc()); 3139 D.setInvalidType(); 3140 } 3141 3142 // C++0x [class.ctor]p4: 3143 // A constructor shall not be declared with a ref-qualifier. 3144 if (FTI.hasRefQualifier()) { 3145 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3146 << FTI.RefQualifierIsLValueRef 3147 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3148 D.setInvalidType(); 3149 } 3150 3151 // Rebuild the function type "R" without any type qualifiers (in 3152 // case any of the errors above fired) and with "void" as the 3153 // return type, since constructors don't have return types. 3154 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3155 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3156 return R; 3157 3158 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3159 EPI.TypeQuals = 0; 3160 EPI.RefQualifier = RQ_None; 3161 3162 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3163 Proto->getNumArgs(), EPI); 3164} 3165 3166/// CheckConstructor - Checks a fully-formed constructor for 3167/// well-formedness, issuing any diagnostics required. Returns true if 3168/// the constructor declarator is invalid. 3169void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3170 CXXRecordDecl *ClassDecl 3171 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3172 if (!ClassDecl) 3173 return Constructor->setInvalidDecl(); 3174 3175 // C++ [class.copy]p3: 3176 // A declaration of a constructor for a class X is ill-formed if 3177 // its first parameter is of type (optionally cv-qualified) X and 3178 // either there are no other parameters or else all other 3179 // parameters have default arguments. 3180 if (!Constructor->isInvalidDecl() && 3181 ((Constructor->getNumParams() == 1) || 3182 (Constructor->getNumParams() > 1 && 3183 Constructor->getParamDecl(1)->hasDefaultArg())) && 3184 Constructor->getTemplateSpecializationKind() 3185 != TSK_ImplicitInstantiation) { 3186 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3187 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3188 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3189 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3190 const char *ConstRef 3191 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3192 : " const &"; 3193 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3194 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3195 3196 // FIXME: Rather that making the constructor invalid, we should endeavor 3197 // to fix the type. 3198 Constructor->setInvalidDecl(); 3199 } 3200 } 3201} 3202 3203/// CheckDestructor - Checks a fully-formed destructor definition for 3204/// well-formedness, issuing any diagnostics required. Returns true 3205/// on error. 3206bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3207 CXXRecordDecl *RD = Destructor->getParent(); 3208 3209 if (Destructor->isVirtual()) { 3210 SourceLocation Loc; 3211 3212 if (!Destructor->isImplicit()) 3213 Loc = Destructor->getLocation(); 3214 else 3215 Loc = RD->getLocation(); 3216 3217 // If we have a virtual destructor, look up the deallocation function 3218 FunctionDecl *OperatorDelete = 0; 3219 DeclarationName Name = 3220 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3221 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3222 return true; 3223 3224 MarkDeclarationReferenced(Loc, OperatorDelete); 3225 3226 Destructor->setOperatorDelete(OperatorDelete); 3227 } 3228 3229 return false; 3230} 3231 3232static inline bool 3233FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3234 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3235 FTI.ArgInfo[0].Param && 3236 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3237} 3238 3239/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3240/// the well-formednes of the destructor declarator @p D with type @p 3241/// R. If there are any errors in the declarator, this routine will 3242/// emit diagnostics and set the declarator to invalid. Even if this happens, 3243/// will be updated to reflect a well-formed type for the destructor and 3244/// returned. 3245QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3246 StorageClass& SC) { 3247 // C++ [class.dtor]p1: 3248 // [...] A typedef-name that names a class is a class-name 3249 // (7.1.3); however, a typedef-name that names a class shall not 3250 // be used as the identifier in the declarator for a destructor 3251 // declaration. 3252 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3253 if (isa<TypedefType>(DeclaratorType)) 3254 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3255 << DeclaratorType; 3256 3257 // C++ [class.dtor]p2: 3258 // A destructor is used to destroy objects of its class type. A 3259 // destructor takes no parameters, and no return type can be 3260 // specified for it (not even void). The address of a destructor 3261 // shall not be taken. A destructor shall not be static. A 3262 // destructor can be invoked for a const, volatile or const 3263 // volatile object. A destructor shall not be declared const, 3264 // volatile or const volatile (9.3.2). 3265 if (SC == SC_Static) { 3266 if (!D.isInvalidType()) 3267 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3268 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3269 << SourceRange(D.getIdentifierLoc()) 3270 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3271 3272 SC = SC_None; 3273 } 3274 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3275 // Destructors don't have return types, but the parser will 3276 // happily parse something like: 3277 // 3278 // class X { 3279 // float ~X(); 3280 // }; 3281 // 3282 // The return type will be eliminated later. 3283 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3284 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3285 << SourceRange(D.getIdentifierLoc()); 3286 } 3287 3288 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3289 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3290 if (FTI.TypeQuals & Qualifiers::Const) 3291 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3292 << "const" << SourceRange(D.getIdentifierLoc()); 3293 if (FTI.TypeQuals & Qualifiers::Volatile) 3294 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3295 << "volatile" << SourceRange(D.getIdentifierLoc()); 3296 if (FTI.TypeQuals & Qualifiers::Restrict) 3297 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3298 << "restrict" << SourceRange(D.getIdentifierLoc()); 3299 D.setInvalidType(); 3300 } 3301 3302 // C++0x [class.dtor]p2: 3303 // A destructor shall not be declared with a ref-qualifier. 3304 if (FTI.hasRefQualifier()) { 3305 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3306 << FTI.RefQualifierIsLValueRef 3307 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3308 D.setInvalidType(); 3309 } 3310 3311 // Make sure we don't have any parameters. 3312 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3313 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3314 3315 // Delete the parameters. 3316 FTI.freeArgs(); 3317 D.setInvalidType(); 3318 } 3319 3320 // Make sure the destructor isn't variadic. 3321 if (FTI.isVariadic) { 3322 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3323 D.setInvalidType(); 3324 } 3325 3326 // Rebuild the function type "R" without any type qualifiers or 3327 // parameters (in case any of the errors above fired) and with 3328 // "void" as the return type, since destructors don't have return 3329 // types. 3330 if (!D.isInvalidType()) 3331 return R; 3332 3333 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3334 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3335 EPI.Variadic = false; 3336 EPI.TypeQuals = 0; 3337 EPI.RefQualifier = RQ_None; 3338 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3339} 3340 3341/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3342/// well-formednes of the conversion function declarator @p D with 3343/// type @p R. If there are any errors in the declarator, this routine 3344/// will emit diagnostics and return true. Otherwise, it will return 3345/// false. Either way, the type @p R will be updated to reflect a 3346/// well-formed type for the conversion operator. 3347void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3348 StorageClass& SC) { 3349 // C++ [class.conv.fct]p1: 3350 // Neither parameter types nor return type can be specified. The 3351 // type of a conversion function (8.3.5) is "function taking no 3352 // parameter returning conversion-type-id." 3353 if (SC == SC_Static) { 3354 if (!D.isInvalidType()) 3355 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3356 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3357 << SourceRange(D.getIdentifierLoc()); 3358 D.setInvalidType(); 3359 SC = SC_None; 3360 } 3361 3362 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3363 3364 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3365 // Conversion functions don't have return types, but the parser will 3366 // happily parse something like: 3367 // 3368 // class X { 3369 // float operator bool(); 3370 // }; 3371 // 3372 // The return type will be changed later anyway. 3373 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3374 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3375 << SourceRange(D.getIdentifierLoc()); 3376 D.setInvalidType(); 3377 } 3378 3379 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3380 3381 // Make sure we don't have any parameters. 3382 if (Proto->getNumArgs() > 0) { 3383 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3384 3385 // Delete the parameters. 3386 D.getFunctionTypeInfo().freeArgs(); 3387 D.setInvalidType(); 3388 } else if (Proto->isVariadic()) { 3389 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3390 D.setInvalidType(); 3391 } 3392 3393 // Diagnose "&operator bool()" and other such nonsense. This 3394 // is actually a gcc extension which we don't support. 3395 if (Proto->getResultType() != ConvType) { 3396 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3397 << Proto->getResultType(); 3398 D.setInvalidType(); 3399 ConvType = Proto->getResultType(); 3400 } 3401 3402 // C++ [class.conv.fct]p4: 3403 // The conversion-type-id shall not represent a function type nor 3404 // an array type. 3405 if (ConvType->isArrayType()) { 3406 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3407 ConvType = Context.getPointerType(ConvType); 3408 D.setInvalidType(); 3409 } else if (ConvType->isFunctionType()) { 3410 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3411 ConvType = Context.getPointerType(ConvType); 3412 D.setInvalidType(); 3413 } 3414 3415 // Rebuild the function type "R" without any parameters (in case any 3416 // of the errors above fired) and with the conversion type as the 3417 // return type. 3418 if (D.isInvalidType()) 3419 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3420 3421 // C++0x explicit conversion operators. 3422 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3423 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3424 diag::warn_explicit_conversion_functions) 3425 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3426} 3427 3428/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3429/// the declaration of the given C++ conversion function. This routine 3430/// is responsible for recording the conversion function in the C++ 3431/// class, if possible. 3432Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3433 assert(Conversion && "Expected to receive a conversion function declaration"); 3434 3435 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3436 3437 // Make sure we aren't redeclaring the conversion function. 3438 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3439 3440 // C++ [class.conv.fct]p1: 3441 // [...] A conversion function is never used to convert a 3442 // (possibly cv-qualified) object to the (possibly cv-qualified) 3443 // same object type (or a reference to it), to a (possibly 3444 // cv-qualified) base class of that type (or a reference to it), 3445 // or to (possibly cv-qualified) void. 3446 // FIXME: Suppress this warning if the conversion function ends up being a 3447 // virtual function that overrides a virtual function in a base class. 3448 QualType ClassType 3449 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3450 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3451 ConvType = ConvTypeRef->getPointeeType(); 3452 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3453 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3454 /* Suppress diagnostics for instantiations. */; 3455 else if (ConvType->isRecordType()) { 3456 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3457 if (ConvType == ClassType) 3458 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3459 << ClassType; 3460 else if (IsDerivedFrom(ClassType, ConvType)) 3461 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3462 << ClassType << ConvType; 3463 } else if (ConvType->isVoidType()) { 3464 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3465 << ClassType << ConvType; 3466 } 3467 3468 if (FunctionTemplateDecl *ConversionTemplate 3469 = Conversion->getDescribedFunctionTemplate()) 3470 return ConversionTemplate; 3471 3472 return Conversion; 3473} 3474 3475//===----------------------------------------------------------------------===// 3476// Namespace Handling 3477//===----------------------------------------------------------------------===// 3478 3479 3480 3481/// ActOnStartNamespaceDef - This is called at the start of a namespace 3482/// definition. 3483Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3484 SourceLocation InlineLoc, 3485 SourceLocation IdentLoc, 3486 IdentifierInfo *II, 3487 SourceLocation LBrace, 3488 AttributeList *AttrList) { 3489 // anonymous namespace starts at its left brace 3490 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3491 (II ? IdentLoc : LBrace) , II); 3492 Namespc->setLBracLoc(LBrace); 3493 Namespc->setInline(InlineLoc.isValid()); 3494 3495 Scope *DeclRegionScope = NamespcScope->getParent(); 3496 3497 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3498 3499 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3500 PushNamespaceVisibilityAttr(Attr); 3501 3502 if (II) { 3503 // C++ [namespace.def]p2: 3504 // The identifier in an original-namespace-definition shall not 3505 // have been previously defined in the declarative region in 3506 // which the original-namespace-definition appears. The 3507 // identifier in an original-namespace-definition is the name of 3508 // the namespace. Subsequently in that declarative region, it is 3509 // treated as an original-namespace-name. 3510 // 3511 // Since namespace names are unique in their scope, and we don't 3512 // look through using directives, just 3513 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3514 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3515 3516 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3517 // This is an extended namespace definition. 3518 if (Namespc->isInline() != OrigNS->isInline()) { 3519 // inline-ness must match 3520 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3521 << Namespc->isInline(); 3522 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3523 Namespc->setInvalidDecl(); 3524 // Recover by ignoring the new namespace's inline status. 3525 Namespc->setInline(OrigNS->isInline()); 3526 } 3527 3528 // Attach this namespace decl to the chain of extended namespace 3529 // definitions. 3530 OrigNS->setNextNamespace(Namespc); 3531 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3532 3533 // Remove the previous declaration from the scope. 3534 if (DeclRegionScope->isDeclScope(OrigNS)) { 3535 IdResolver.RemoveDecl(OrigNS); 3536 DeclRegionScope->RemoveDecl(OrigNS); 3537 } 3538 } else if (PrevDecl) { 3539 // This is an invalid name redefinition. 3540 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3541 << Namespc->getDeclName(); 3542 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3543 Namespc->setInvalidDecl(); 3544 // Continue on to push Namespc as current DeclContext and return it. 3545 } else if (II->isStr("std") && 3546 CurContext->getRedeclContext()->isTranslationUnit()) { 3547 // This is the first "real" definition of the namespace "std", so update 3548 // our cache of the "std" namespace to point at this definition. 3549 if (NamespaceDecl *StdNS = getStdNamespace()) { 3550 // We had already defined a dummy namespace "std". Link this new 3551 // namespace definition to the dummy namespace "std". 3552 StdNS->setNextNamespace(Namespc); 3553 StdNS->setLocation(IdentLoc); 3554 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3555 } 3556 3557 // Make our StdNamespace cache point at the first real definition of the 3558 // "std" namespace. 3559 StdNamespace = Namespc; 3560 } 3561 3562 PushOnScopeChains(Namespc, DeclRegionScope); 3563 } else { 3564 // Anonymous namespaces. 3565 assert(Namespc->isAnonymousNamespace()); 3566 3567 // Link the anonymous namespace into its parent. 3568 NamespaceDecl *PrevDecl; 3569 DeclContext *Parent = CurContext->getRedeclContext(); 3570 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3571 PrevDecl = TU->getAnonymousNamespace(); 3572 TU->setAnonymousNamespace(Namespc); 3573 } else { 3574 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3575 PrevDecl = ND->getAnonymousNamespace(); 3576 ND->setAnonymousNamespace(Namespc); 3577 } 3578 3579 // Link the anonymous namespace with its previous declaration. 3580 if (PrevDecl) { 3581 assert(PrevDecl->isAnonymousNamespace()); 3582 assert(!PrevDecl->getNextNamespace()); 3583 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3584 PrevDecl->setNextNamespace(Namespc); 3585 3586 if (Namespc->isInline() != PrevDecl->isInline()) { 3587 // inline-ness must match 3588 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3589 << Namespc->isInline(); 3590 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3591 Namespc->setInvalidDecl(); 3592 // Recover by ignoring the new namespace's inline status. 3593 Namespc->setInline(PrevDecl->isInline()); 3594 } 3595 } 3596 3597 CurContext->addDecl(Namespc); 3598 3599 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3600 // behaves as if it were replaced by 3601 // namespace unique { /* empty body */ } 3602 // using namespace unique; 3603 // namespace unique { namespace-body } 3604 // where all occurrences of 'unique' in a translation unit are 3605 // replaced by the same identifier and this identifier differs 3606 // from all other identifiers in the entire program. 3607 3608 // We just create the namespace with an empty name and then add an 3609 // implicit using declaration, just like the standard suggests. 3610 // 3611 // CodeGen enforces the "universally unique" aspect by giving all 3612 // declarations semantically contained within an anonymous 3613 // namespace internal linkage. 3614 3615 if (!PrevDecl) { 3616 UsingDirectiveDecl* UD 3617 = UsingDirectiveDecl::Create(Context, CurContext, 3618 /* 'using' */ LBrace, 3619 /* 'namespace' */ SourceLocation(), 3620 /* qualifier */ SourceRange(), 3621 /* NNS */ NULL, 3622 /* identifier */ SourceLocation(), 3623 Namespc, 3624 /* Ancestor */ CurContext); 3625 UD->setImplicit(); 3626 CurContext->addDecl(UD); 3627 } 3628 } 3629 3630 // Although we could have an invalid decl (i.e. the namespace name is a 3631 // redefinition), push it as current DeclContext and try to continue parsing. 3632 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3633 // for the namespace has the declarations that showed up in that particular 3634 // namespace definition. 3635 PushDeclContext(NamespcScope, Namespc); 3636 return Namespc; 3637} 3638 3639/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3640/// is a namespace alias, returns the namespace it points to. 3641static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3642 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3643 return AD->getNamespace(); 3644 return dyn_cast_or_null<NamespaceDecl>(D); 3645} 3646 3647/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3648/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3649void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3650 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3651 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3652 Namespc->setRBracLoc(RBrace); 3653 PopDeclContext(); 3654 if (Namespc->hasAttr<VisibilityAttr>()) 3655 PopPragmaVisibility(); 3656} 3657 3658CXXRecordDecl *Sema::getStdBadAlloc() const { 3659 return cast_or_null<CXXRecordDecl>( 3660 StdBadAlloc.get(Context.getExternalSource())); 3661} 3662 3663NamespaceDecl *Sema::getStdNamespace() const { 3664 return cast_or_null<NamespaceDecl>( 3665 StdNamespace.get(Context.getExternalSource())); 3666} 3667 3668/// \brief Retrieve the special "std" namespace, which may require us to 3669/// implicitly define the namespace. 3670NamespaceDecl *Sema::getOrCreateStdNamespace() { 3671 if (!StdNamespace) { 3672 // The "std" namespace has not yet been defined, so build one implicitly. 3673 StdNamespace = NamespaceDecl::Create(Context, 3674 Context.getTranslationUnitDecl(), 3675 SourceLocation(), 3676 &PP.getIdentifierTable().get("std")); 3677 getStdNamespace()->setImplicit(true); 3678 } 3679 3680 return getStdNamespace(); 3681} 3682 3683Decl *Sema::ActOnUsingDirective(Scope *S, 3684 SourceLocation UsingLoc, 3685 SourceLocation NamespcLoc, 3686 CXXScopeSpec &SS, 3687 SourceLocation IdentLoc, 3688 IdentifierInfo *NamespcName, 3689 AttributeList *AttrList) { 3690 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3691 assert(NamespcName && "Invalid NamespcName."); 3692 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3693 3694 // This can only happen along a recovery path. 3695 while (S->getFlags() & Scope::TemplateParamScope) 3696 S = S->getParent(); 3697 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3698 3699 UsingDirectiveDecl *UDir = 0; 3700 NestedNameSpecifier *Qualifier = 0; 3701 if (SS.isSet()) 3702 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3703 3704 // Lookup namespace name. 3705 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3706 LookupParsedName(R, S, &SS); 3707 if (R.isAmbiguous()) 3708 return 0; 3709 3710 if (R.empty()) { 3711 // Allow "using namespace std;" or "using namespace ::std;" even if 3712 // "std" hasn't been defined yet, for GCC compatibility. 3713 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3714 NamespcName->isStr("std")) { 3715 Diag(IdentLoc, diag::ext_using_undefined_std); 3716 R.addDecl(getOrCreateStdNamespace()); 3717 R.resolveKind(); 3718 } 3719 // Otherwise, attempt typo correction. 3720 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3721 CTC_NoKeywords, 0)) { 3722 if (R.getAsSingle<NamespaceDecl>() || 3723 R.getAsSingle<NamespaceAliasDecl>()) { 3724 if (DeclContext *DC = computeDeclContext(SS, false)) 3725 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3726 << NamespcName << DC << Corrected << SS.getRange() 3727 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3728 else 3729 Diag(IdentLoc, diag::err_using_directive_suggest) 3730 << NamespcName << Corrected 3731 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3732 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3733 << Corrected; 3734 3735 NamespcName = Corrected.getAsIdentifierInfo(); 3736 } else { 3737 R.clear(); 3738 R.setLookupName(NamespcName); 3739 } 3740 } 3741 } 3742 3743 if (!R.empty()) { 3744 NamedDecl *Named = R.getFoundDecl(); 3745 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3746 && "expected namespace decl"); 3747 // C++ [namespace.udir]p1: 3748 // A using-directive specifies that the names in the nominated 3749 // namespace can be used in the scope in which the 3750 // using-directive appears after the using-directive. During 3751 // unqualified name lookup (3.4.1), the names appear as if they 3752 // were declared in the nearest enclosing namespace which 3753 // contains both the using-directive and the nominated 3754 // namespace. [Note: in this context, "contains" means "contains 3755 // directly or indirectly". ] 3756 3757 // Find enclosing context containing both using-directive and 3758 // nominated namespace. 3759 NamespaceDecl *NS = getNamespaceDecl(Named); 3760 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3761 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3762 CommonAncestor = CommonAncestor->getParent(); 3763 3764 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3765 SS.getRange(), 3766 (NestedNameSpecifier *)SS.getScopeRep(), 3767 IdentLoc, Named, CommonAncestor); 3768 PushUsingDirective(S, UDir); 3769 } else { 3770 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3771 } 3772 3773 // FIXME: We ignore attributes for now. 3774 return UDir; 3775} 3776 3777void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3778 // If scope has associated entity, then using directive is at namespace 3779 // or translation unit scope. We add UsingDirectiveDecls, into 3780 // it's lookup structure. 3781 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3782 Ctx->addDecl(UDir); 3783 else 3784 // Otherwise it is block-sope. using-directives will affect lookup 3785 // only to the end of scope. 3786 S->PushUsingDirective(UDir); 3787} 3788 3789 3790Decl *Sema::ActOnUsingDeclaration(Scope *S, 3791 AccessSpecifier AS, 3792 bool HasUsingKeyword, 3793 SourceLocation UsingLoc, 3794 CXXScopeSpec &SS, 3795 UnqualifiedId &Name, 3796 AttributeList *AttrList, 3797 bool IsTypeName, 3798 SourceLocation TypenameLoc) { 3799 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3800 3801 switch (Name.getKind()) { 3802 case UnqualifiedId::IK_Identifier: 3803 case UnqualifiedId::IK_OperatorFunctionId: 3804 case UnqualifiedId::IK_LiteralOperatorId: 3805 case UnqualifiedId::IK_ConversionFunctionId: 3806 break; 3807 3808 case UnqualifiedId::IK_ConstructorName: 3809 case UnqualifiedId::IK_ConstructorTemplateId: 3810 // C++0x inherited constructors. 3811 if (getLangOptions().CPlusPlus0x) break; 3812 3813 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3814 << SS.getRange(); 3815 return 0; 3816 3817 case UnqualifiedId::IK_DestructorName: 3818 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3819 << SS.getRange(); 3820 return 0; 3821 3822 case UnqualifiedId::IK_TemplateId: 3823 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3824 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3825 return 0; 3826 } 3827 3828 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3829 DeclarationName TargetName = TargetNameInfo.getName(); 3830 if (!TargetName) 3831 return 0; 3832 3833 // Warn about using declarations. 3834 // TODO: store that the declaration was written without 'using' and 3835 // talk about access decls instead of using decls in the 3836 // diagnostics. 3837 if (!HasUsingKeyword) { 3838 UsingLoc = Name.getSourceRange().getBegin(); 3839 3840 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3841 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3842 } 3843 3844 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3845 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3846 return 0; 3847 3848 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3849 TargetNameInfo, AttrList, 3850 /* IsInstantiation */ false, 3851 IsTypeName, TypenameLoc); 3852 if (UD) 3853 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3854 3855 return UD; 3856} 3857 3858/// \brief Determine whether a using declaration considers the given 3859/// declarations as "equivalent", e.g., if they are redeclarations of 3860/// the same entity or are both typedefs of the same type. 3861static bool 3862IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3863 bool &SuppressRedeclaration) { 3864 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3865 SuppressRedeclaration = false; 3866 return true; 3867 } 3868 3869 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3870 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3871 SuppressRedeclaration = true; 3872 return Context.hasSameType(TD1->getUnderlyingType(), 3873 TD2->getUnderlyingType()); 3874 } 3875 3876 return false; 3877} 3878 3879 3880/// Determines whether to create a using shadow decl for a particular 3881/// decl, given the set of decls existing prior to this using lookup. 3882bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3883 const LookupResult &Previous) { 3884 // Diagnose finding a decl which is not from a base class of the 3885 // current class. We do this now because there are cases where this 3886 // function will silently decide not to build a shadow decl, which 3887 // will pre-empt further diagnostics. 3888 // 3889 // We don't need to do this in C++0x because we do the check once on 3890 // the qualifier. 3891 // 3892 // FIXME: diagnose the following if we care enough: 3893 // struct A { int foo; }; 3894 // struct B : A { using A::foo; }; 3895 // template <class T> struct C : A {}; 3896 // template <class T> struct D : C<T> { using B::foo; } // <--- 3897 // This is invalid (during instantiation) in C++03 because B::foo 3898 // resolves to the using decl in B, which is not a base class of D<T>. 3899 // We can't diagnose it immediately because C<T> is an unknown 3900 // specialization. The UsingShadowDecl in D<T> then points directly 3901 // to A::foo, which will look well-formed when we instantiate. 3902 // The right solution is to not collapse the shadow-decl chain. 3903 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3904 DeclContext *OrigDC = Orig->getDeclContext(); 3905 3906 // Handle enums and anonymous structs. 3907 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3908 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3909 while (OrigRec->isAnonymousStructOrUnion()) 3910 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3911 3912 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3913 if (OrigDC == CurContext) { 3914 Diag(Using->getLocation(), 3915 diag::err_using_decl_nested_name_specifier_is_current_class) 3916 << Using->getNestedNameRange(); 3917 Diag(Orig->getLocation(), diag::note_using_decl_target); 3918 return true; 3919 } 3920 3921 Diag(Using->getNestedNameRange().getBegin(), 3922 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3923 << Using->getTargetNestedNameDecl() 3924 << cast<CXXRecordDecl>(CurContext) 3925 << Using->getNestedNameRange(); 3926 Diag(Orig->getLocation(), diag::note_using_decl_target); 3927 return true; 3928 } 3929 } 3930 3931 if (Previous.empty()) return false; 3932 3933 NamedDecl *Target = Orig; 3934 if (isa<UsingShadowDecl>(Target)) 3935 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3936 3937 // If the target happens to be one of the previous declarations, we 3938 // don't have a conflict. 3939 // 3940 // FIXME: but we might be increasing its access, in which case we 3941 // should redeclare it. 3942 NamedDecl *NonTag = 0, *Tag = 0; 3943 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3944 I != E; ++I) { 3945 NamedDecl *D = (*I)->getUnderlyingDecl(); 3946 bool Result; 3947 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3948 return Result; 3949 3950 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3951 } 3952 3953 if (Target->isFunctionOrFunctionTemplate()) { 3954 FunctionDecl *FD; 3955 if (isa<FunctionTemplateDecl>(Target)) 3956 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3957 else 3958 FD = cast<FunctionDecl>(Target); 3959 3960 NamedDecl *OldDecl = 0; 3961 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3962 case Ovl_Overload: 3963 return false; 3964 3965 case Ovl_NonFunction: 3966 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3967 break; 3968 3969 // We found a decl with the exact signature. 3970 case Ovl_Match: 3971 // If we're in a record, we want to hide the target, so we 3972 // return true (without a diagnostic) to tell the caller not to 3973 // build a shadow decl. 3974 if (CurContext->isRecord()) 3975 return true; 3976 3977 // If we're not in a record, this is an error. 3978 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3979 break; 3980 } 3981 3982 Diag(Target->getLocation(), diag::note_using_decl_target); 3983 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3984 return true; 3985 } 3986 3987 // Target is not a function. 3988 3989 if (isa<TagDecl>(Target)) { 3990 // No conflict between a tag and a non-tag. 3991 if (!Tag) return false; 3992 3993 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3994 Diag(Target->getLocation(), diag::note_using_decl_target); 3995 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3996 return true; 3997 } 3998 3999 // No conflict between a tag and a non-tag. 4000 if (!NonTag) return false; 4001 4002 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4003 Diag(Target->getLocation(), diag::note_using_decl_target); 4004 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4005 return true; 4006} 4007 4008/// Builds a shadow declaration corresponding to a 'using' declaration. 4009UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4010 UsingDecl *UD, 4011 NamedDecl *Orig) { 4012 4013 // If we resolved to another shadow declaration, just coalesce them. 4014 NamedDecl *Target = Orig; 4015 if (isa<UsingShadowDecl>(Target)) { 4016 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4017 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4018 } 4019 4020 UsingShadowDecl *Shadow 4021 = UsingShadowDecl::Create(Context, CurContext, 4022 UD->getLocation(), UD, Target); 4023 UD->addShadowDecl(Shadow); 4024 4025 Shadow->setAccess(UD->getAccess()); 4026 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4027 Shadow->setInvalidDecl(); 4028 4029 if (S) 4030 PushOnScopeChains(Shadow, S); 4031 else 4032 CurContext->addDecl(Shadow); 4033 4034 4035 return Shadow; 4036} 4037 4038/// Hides a using shadow declaration. This is required by the current 4039/// using-decl implementation when a resolvable using declaration in a 4040/// class is followed by a declaration which would hide or override 4041/// one or more of the using decl's targets; for example: 4042/// 4043/// struct Base { void foo(int); }; 4044/// struct Derived : Base { 4045/// using Base::foo; 4046/// void foo(int); 4047/// }; 4048/// 4049/// The governing language is C++03 [namespace.udecl]p12: 4050/// 4051/// When a using-declaration brings names from a base class into a 4052/// derived class scope, member functions in the derived class 4053/// override and/or hide member functions with the same name and 4054/// parameter types in a base class (rather than conflicting). 4055/// 4056/// There are two ways to implement this: 4057/// (1) optimistically create shadow decls when they're not hidden 4058/// by existing declarations, or 4059/// (2) don't create any shadow decls (or at least don't make them 4060/// visible) until we've fully parsed/instantiated the class. 4061/// The problem with (1) is that we might have to retroactively remove 4062/// a shadow decl, which requires several O(n) operations because the 4063/// decl structures are (very reasonably) not designed for removal. 4064/// (2) avoids this but is very fiddly and phase-dependent. 4065void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4066 if (Shadow->getDeclName().getNameKind() == 4067 DeclarationName::CXXConversionFunctionName) 4068 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4069 4070 // Remove it from the DeclContext... 4071 Shadow->getDeclContext()->removeDecl(Shadow); 4072 4073 // ...and the scope, if applicable... 4074 if (S) { 4075 S->RemoveDecl(Shadow); 4076 IdResolver.RemoveDecl(Shadow); 4077 } 4078 4079 // ...and the using decl. 4080 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4081 4082 // TODO: complain somehow if Shadow was used. It shouldn't 4083 // be possible for this to happen, because...? 4084} 4085 4086/// Builds a using declaration. 4087/// 4088/// \param IsInstantiation - Whether this call arises from an 4089/// instantiation of an unresolved using declaration. We treat 4090/// the lookup differently for these declarations. 4091NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4092 SourceLocation UsingLoc, 4093 CXXScopeSpec &SS, 4094 const DeclarationNameInfo &NameInfo, 4095 AttributeList *AttrList, 4096 bool IsInstantiation, 4097 bool IsTypeName, 4098 SourceLocation TypenameLoc) { 4099 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4100 SourceLocation IdentLoc = NameInfo.getLoc(); 4101 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4102 4103 // FIXME: We ignore attributes for now. 4104 4105 if (SS.isEmpty()) { 4106 Diag(IdentLoc, diag::err_using_requires_qualname); 4107 return 0; 4108 } 4109 4110 // Do the redeclaration lookup in the current scope. 4111 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4112 ForRedeclaration); 4113 Previous.setHideTags(false); 4114 if (S) { 4115 LookupName(Previous, S); 4116 4117 // It is really dumb that we have to do this. 4118 LookupResult::Filter F = Previous.makeFilter(); 4119 while (F.hasNext()) { 4120 NamedDecl *D = F.next(); 4121 if (!isDeclInScope(D, CurContext, S)) 4122 F.erase(); 4123 } 4124 F.done(); 4125 } else { 4126 assert(IsInstantiation && "no scope in non-instantiation"); 4127 assert(CurContext->isRecord() && "scope not record in instantiation"); 4128 LookupQualifiedName(Previous, CurContext); 4129 } 4130 4131 NestedNameSpecifier *NNS = SS.getScopeRep(); 4132 4133 // Check for invalid redeclarations. 4134 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4135 return 0; 4136 4137 // Check for bad qualifiers. 4138 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4139 return 0; 4140 4141 DeclContext *LookupContext = computeDeclContext(SS); 4142 NamedDecl *D; 4143 if (!LookupContext) { 4144 if (IsTypeName) { 4145 // FIXME: not all declaration name kinds are legal here 4146 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4147 UsingLoc, TypenameLoc, 4148 SS.getRange(), NNS, 4149 IdentLoc, NameInfo.getName()); 4150 } else { 4151 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 4152 UsingLoc, SS.getRange(), 4153 NNS, NameInfo); 4154 } 4155 } else { 4156 D = UsingDecl::Create(Context, CurContext, 4157 SS.getRange(), UsingLoc, NNS, NameInfo, 4158 IsTypeName); 4159 } 4160 D->setAccess(AS); 4161 CurContext->addDecl(D); 4162 4163 if (!LookupContext) return D; 4164 UsingDecl *UD = cast<UsingDecl>(D); 4165 4166 if (RequireCompleteDeclContext(SS, LookupContext)) { 4167 UD->setInvalidDecl(); 4168 return UD; 4169 } 4170 4171 // Constructor inheriting using decls get special treatment. 4172 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4173 if (CheckInheritedConstructorUsingDecl(UD)) 4174 UD->setInvalidDecl(); 4175 return UD; 4176 } 4177 4178 // Otherwise, look up the target name. 4179 4180 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4181 4182 // Unlike most lookups, we don't always want to hide tag 4183 // declarations: tag names are visible through the using declaration 4184 // even if hidden by ordinary names, *except* in a dependent context 4185 // where it's important for the sanity of two-phase lookup. 4186 if (!IsInstantiation) 4187 R.setHideTags(false); 4188 4189 LookupQualifiedName(R, LookupContext); 4190 4191 if (R.empty()) { 4192 Diag(IdentLoc, diag::err_no_member) 4193 << NameInfo.getName() << LookupContext << SS.getRange(); 4194 UD->setInvalidDecl(); 4195 return UD; 4196 } 4197 4198 if (R.isAmbiguous()) { 4199 UD->setInvalidDecl(); 4200 return UD; 4201 } 4202 4203 if (IsTypeName) { 4204 // If we asked for a typename and got a non-type decl, error out. 4205 if (!R.getAsSingle<TypeDecl>()) { 4206 Diag(IdentLoc, diag::err_using_typename_non_type); 4207 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4208 Diag((*I)->getUnderlyingDecl()->getLocation(), 4209 diag::note_using_decl_target); 4210 UD->setInvalidDecl(); 4211 return UD; 4212 } 4213 } else { 4214 // If we asked for a non-typename and we got a type, error out, 4215 // but only if this is an instantiation of an unresolved using 4216 // decl. Otherwise just silently find the type name. 4217 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4218 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4219 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4220 UD->setInvalidDecl(); 4221 return UD; 4222 } 4223 } 4224 4225 // C++0x N2914 [namespace.udecl]p6: 4226 // A using-declaration shall not name a namespace. 4227 if (R.getAsSingle<NamespaceDecl>()) { 4228 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4229 << SS.getRange(); 4230 UD->setInvalidDecl(); 4231 return UD; 4232 } 4233 4234 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4235 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4236 BuildUsingShadowDecl(S, UD, *I); 4237 } 4238 4239 return UD; 4240} 4241 4242/// Additional checks for a using declaration referring to a constructor name. 4243bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4244 if (UD->isTypeName()) { 4245 // FIXME: Cannot specify typename when specifying constructor 4246 return true; 4247 } 4248 4249 const Type *SourceType = UD->getTargetNestedNameDecl()->getAsType(); 4250 assert(SourceType && 4251 "Using decl naming constructor doesn't have type in scope spec."); 4252 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4253 4254 // Check whether the named type is a direct base class. 4255 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4256 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4257 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4258 BaseIt != BaseE; ++BaseIt) { 4259 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4260 if (CanonicalSourceType == BaseType) 4261 break; 4262 } 4263 4264 if (BaseIt == BaseE) { 4265 // Did not find SourceType in the bases. 4266 Diag(UD->getUsingLocation(), 4267 diag::err_using_decl_constructor_not_in_direct_base) 4268 << UD->getNameInfo().getSourceRange() 4269 << QualType(SourceType, 0) << TargetClass; 4270 return true; 4271 } 4272 4273 BaseIt->setInheritConstructors(); 4274 4275 return false; 4276} 4277 4278/// Checks that the given using declaration is not an invalid 4279/// redeclaration. Note that this is checking only for the using decl 4280/// itself, not for any ill-formedness among the UsingShadowDecls. 4281bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4282 bool isTypeName, 4283 const CXXScopeSpec &SS, 4284 SourceLocation NameLoc, 4285 const LookupResult &Prev) { 4286 // C++03 [namespace.udecl]p8: 4287 // C++0x [namespace.udecl]p10: 4288 // A using-declaration is a declaration and can therefore be used 4289 // repeatedly where (and only where) multiple declarations are 4290 // allowed. 4291 // 4292 // That's in non-member contexts. 4293 if (!CurContext->getRedeclContext()->isRecord()) 4294 return false; 4295 4296 NestedNameSpecifier *Qual 4297 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4298 4299 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4300 NamedDecl *D = *I; 4301 4302 bool DTypename; 4303 NestedNameSpecifier *DQual; 4304 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4305 DTypename = UD->isTypeName(); 4306 DQual = UD->getTargetNestedNameDecl(); 4307 } else if (UnresolvedUsingValueDecl *UD 4308 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4309 DTypename = false; 4310 DQual = UD->getTargetNestedNameSpecifier(); 4311 } else if (UnresolvedUsingTypenameDecl *UD 4312 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4313 DTypename = true; 4314 DQual = UD->getTargetNestedNameSpecifier(); 4315 } else continue; 4316 4317 // using decls differ if one says 'typename' and the other doesn't. 4318 // FIXME: non-dependent using decls? 4319 if (isTypeName != DTypename) continue; 4320 4321 // using decls differ if they name different scopes (but note that 4322 // template instantiation can cause this check to trigger when it 4323 // didn't before instantiation). 4324 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4325 Context.getCanonicalNestedNameSpecifier(DQual)) 4326 continue; 4327 4328 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4329 Diag(D->getLocation(), diag::note_using_decl) << 1; 4330 return true; 4331 } 4332 4333 return false; 4334} 4335 4336 4337/// Checks that the given nested-name qualifier used in a using decl 4338/// in the current context is appropriately related to the current 4339/// scope. If an error is found, diagnoses it and returns true. 4340bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4341 const CXXScopeSpec &SS, 4342 SourceLocation NameLoc) { 4343 DeclContext *NamedContext = computeDeclContext(SS); 4344 4345 if (!CurContext->isRecord()) { 4346 // C++03 [namespace.udecl]p3: 4347 // C++0x [namespace.udecl]p8: 4348 // A using-declaration for a class member shall be a member-declaration. 4349 4350 // If we weren't able to compute a valid scope, it must be a 4351 // dependent class scope. 4352 if (!NamedContext || NamedContext->isRecord()) { 4353 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4354 << SS.getRange(); 4355 return true; 4356 } 4357 4358 // Otherwise, everything is known to be fine. 4359 return false; 4360 } 4361 4362 // The current scope is a record. 4363 4364 // If the named context is dependent, we can't decide much. 4365 if (!NamedContext) { 4366 // FIXME: in C++0x, we can diagnose if we can prove that the 4367 // nested-name-specifier does not refer to a base class, which is 4368 // still possible in some cases. 4369 4370 // Otherwise we have to conservatively report that things might be 4371 // okay. 4372 return false; 4373 } 4374 4375 if (!NamedContext->isRecord()) { 4376 // Ideally this would point at the last name in the specifier, 4377 // but we don't have that level of source info. 4378 Diag(SS.getRange().getBegin(), 4379 diag::err_using_decl_nested_name_specifier_is_not_class) 4380 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4381 return true; 4382 } 4383 4384 if (!NamedContext->isDependentContext() && 4385 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4386 return true; 4387 4388 if (getLangOptions().CPlusPlus0x) { 4389 // C++0x [namespace.udecl]p3: 4390 // In a using-declaration used as a member-declaration, the 4391 // nested-name-specifier shall name a base class of the class 4392 // being defined. 4393 4394 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4395 cast<CXXRecordDecl>(NamedContext))) { 4396 if (CurContext == NamedContext) { 4397 Diag(NameLoc, 4398 diag::err_using_decl_nested_name_specifier_is_current_class) 4399 << SS.getRange(); 4400 return true; 4401 } 4402 4403 Diag(SS.getRange().getBegin(), 4404 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4405 << (NestedNameSpecifier*) SS.getScopeRep() 4406 << cast<CXXRecordDecl>(CurContext) 4407 << SS.getRange(); 4408 return true; 4409 } 4410 4411 return false; 4412 } 4413 4414 // C++03 [namespace.udecl]p4: 4415 // A using-declaration used as a member-declaration shall refer 4416 // to a member of a base class of the class being defined [etc.]. 4417 4418 // Salient point: SS doesn't have to name a base class as long as 4419 // lookup only finds members from base classes. Therefore we can 4420 // diagnose here only if we can prove that that can't happen, 4421 // i.e. if the class hierarchies provably don't intersect. 4422 4423 // TODO: it would be nice if "definitely valid" results were cached 4424 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4425 // need to be repeated. 4426 4427 struct UserData { 4428 llvm::DenseSet<const CXXRecordDecl*> Bases; 4429 4430 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4431 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4432 Data->Bases.insert(Base); 4433 return true; 4434 } 4435 4436 bool hasDependentBases(const CXXRecordDecl *Class) { 4437 return !Class->forallBases(collect, this); 4438 } 4439 4440 /// Returns true if the base is dependent or is one of the 4441 /// accumulated base classes. 4442 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4443 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4444 return !Data->Bases.count(Base); 4445 } 4446 4447 bool mightShareBases(const CXXRecordDecl *Class) { 4448 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4449 } 4450 }; 4451 4452 UserData Data; 4453 4454 // Returns false if we find a dependent base. 4455 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4456 return false; 4457 4458 // Returns false if the class has a dependent base or if it or one 4459 // of its bases is present in the base set of the current context. 4460 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4461 return false; 4462 4463 Diag(SS.getRange().getBegin(), 4464 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4465 << (NestedNameSpecifier*) SS.getScopeRep() 4466 << cast<CXXRecordDecl>(CurContext) 4467 << SS.getRange(); 4468 4469 return true; 4470} 4471 4472Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4473 SourceLocation NamespaceLoc, 4474 SourceLocation AliasLoc, 4475 IdentifierInfo *Alias, 4476 CXXScopeSpec &SS, 4477 SourceLocation IdentLoc, 4478 IdentifierInfo *Ident) { 4479 4480 // Lookup the namespace name. 4481 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4482 LookupParsedName(R, S, &SS); 4483 4484 // Check if we have a previous declaration with the same name. 4485 NamedDecl *PrevDecl 4486 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4487 ForRedeclaration); 4488 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4489 PrevDecl = 0; 4490 4491 if (PrevDecl) { 4492 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4493 // We already have an alias with the same name that points to the same 4494 // namespace, so don't create a new one. 4495 // FIXME: At some point, we'll want to create the (redundant) 4496 // declaration to maintain better source information. 4497 if (!R.isAmbiguous() && !R.empty() && 4498 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4499 return 0; 4500 } 4501 4502 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4503 diag::err_redefinition_different_kind; 4504 Diag(AliasLoc, DiagID) << Alias; 4505 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4506 return 0; 4507 } 4508 4509 if (R.isAmbiguous()) 4510 return 0; 4511 4512 if (R.empty()) { 4513 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4514 CTC_NoKeywords, 0)) { 4515 if (R.getAsSingle<NamespaceDecl>() || 4516 R.getAsSingle<NamespaceAliasDecl>()) { 4517 if (DeclContext *DC = computeDeclContext(SS, false)) 4518 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4519 << Ident << DC << Corrected << SS.getRange() 4520 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4521 else 4522 Diag(IdentLoc, diag::err_using_directive_suggest) 4523 << Ident << Corrected 4524 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4525 4526 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4527 << Corrected; 4528 4529 Ident = Corrected.getAsIdentifierInfo(); 4530 } else { 4531 R.clear(); 4532 R.setLookupName(Ident); 4533 } 4534 } 4535 4536 if (R.empty()) { 4537 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4538 return 0; 4539 } 4540 } 4541 4542 NamespaceAliasDecl *AliasDecl = 4543 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4544 Alias, SS.getRange(), 4545 (NestedNameSpecifier *)SS.getScopeRep(), 4546 IdentLoc, R.getFoundDecl()); 4547 4548 PushOnScopeChains(AliasDecl, S); 4549 return AliasDecl; 4550} 4551 4552namespace { 4553 /// \brief Scoped object used to handle the state changes required in Sema 4554 /// to implicitly define the body of a C++ member function; 4555 class ImplicitlyDefinedFunctionScope { 4556 Sema &S; 4557 Sema::ContextRAII SavedContext; 4558 4559 public: 4560 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4561 : S(S), SavedContext(S, Method) 4562 { 4563 S.PushFunctionScope(); 4564 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4565 } 4566 4567 ~ImplicitlyDefinedFunctionScope() { 4568 S.PopExpressionEvaluationContext(); 4569 S.PopFunctionOrBlockScope(); 4570 } 4571 }; 4572} 4573 4574static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4575 CXXRecordDecl *D) { 4576 ASTContext &Context = Self.Context; 4577 QualType ClassType = Context.getTypeDeclType(D); 4578 DeclarationName ConstructorName 4579 = Context.DeclarationNames.getCXXConstructorName( 4580 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4581 4582 DeclContext::lookup_const_iterator Con, ConEnd; 4583 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4584 Con != ConEnd; ++Con) { 4585 // FIXME: In C++0x, a constructor template can be a default constructor. 4586 if (isa<FunctionTemplateDecl>(*Con)) 4587 continue; 4588 4589 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4590 if (Constructor->isDefaultConstructor()) 4591 return Constructor; 4592 } 4593 return 0; 4594} 4595 4596CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4597 CXXRecordDecl *ClassDecl) { 4598 // C++ [class.ctor]p5: 4599 // A default constructor for a class X is a constructor of class X 4600 // that can be called without an argument. If there is no 4601 // user-declared constructor for class X, a default constructor is 4602 // implicitly declared. An implicitly-declared default constructor 4603 // is an inline public member of its class. 4604 assert(!ClassDecl->hasUserDeclaredConstructor() && 4605 "Should not build implicit default constructor!"); 4606 4607 // C++ [except.spec]p14: 4608 // An implicitly declared special member function (Clause 12) shall have an 4609 // exception-specification. [...] 4610 ImplicitExceptionSpecification ExceptSpec(Context); 4611 4612 // Direct base-class destructors. 4613 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4614 BEnd = ClassDecl->bases_end(); 4615 B != BEnd; ++B) { 4616 if (B->isVirtual()) // Handled below. 4617 continue; 4618 4619 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4620 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4621 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4622 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4623 else if (CXXConstructorDecl *Constructor 4624 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4625 ExceptSpec.CalledDecl(Constructor); 4626 } 4627 } 4628 4629 // Virtual base-class destructors. 4630 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4631 BEnd = ClassDecl->vbases_end(); 4632 B != BEnd; ++B) { 4633 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4634 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4635 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4636 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4637 else if (CXXConstructorDecl *Constructor 4638 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4639 ExceptSpec.CalledDecl(Constructor); 4640 } 4641 } 4642 4643 // Field destructors. 4644 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4645 FEnd = ClassDecl->field_end(); 4646 F != FEnd; ++F) { 4647 if (const RecordType *RecordTy 4648 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4649 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4650 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4651 ExceptSpec.CalledDecl( 4652 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4653 else if (CXXConstructorDecl *Constructor 4654 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4655 ExceptSpec.CalledDecl(Constructor); 4656 } 4657 } 4658 4659 FunctionProtoType::ExtProtoInfo EPI; 4660 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4661 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4662 EPI.NumExceptions = ExceptSpec.size(); 4663 EPI.Exceptions = ExceptSpec.data(); 4664 4665 // Create the actual constructor declaration. 4666 CanQualType ClassType 4667 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4668 DeclarationName Name 4669 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4670 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4671 CXXConstructorDecl *DefaultCon 4672 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4673 Context.getFunctionType(Context.VoidTy, 4674 0, 0, EPI), 4675 /*TInfo=*/0, 4676 /*isExplicit=*/false, 4677 /*isInline=*/true, 4678 /*isImplicitlyDeclared=*/true); 4679 DefaultCon->setAccess(AS_public); 4680 DefaultCon->setImplicit(); 4681 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4682 4683 // Note that we have declared this constructor. 4684 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4685 4686 if (Scope *S = getScopeForContext(ClassDecl)) 4687 PushOnScopeChains(DefaultCon, S, false); 4688 ClassDecl->addDecl(DefaultCon); 4689 4690 return DefaultCon; 4691} 4692 4693void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4694 CXXConstructorDecl *Constructor) { 4695 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4696 !Constructor->isUsed(false)) && 4697 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4698 4699 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4700 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4701 4702 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4703 DiagnosticErrorTrap Trap(Diags); 4704 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4705 Trap.hasErrorOccurred()) { 4706 Diag(CurrentLocation, diag::note_member_synthesized_at) 4707 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4708 Constructor->setInvalidDecl(); 4709 return; 4710 } 4711 4712 SourceLocation Loc = Constructor->getLocation(); 4713 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4714 4715 Constructor->setUsed(); 4716 MarkVTableUsed(CurrentLocation, ClassDecl); 4717} 4718 4719void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4720 // We start with an initial pass over the base classes to collect those that 4721 // inherit constructors from. If there are none, we can forgo all further 4722 // processing. 4723 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4724 BasesVector BasesToInheritFrom; 4725 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4726 BaseE = ClassDecl->bases_end(); 4727 BaseIt != BaseE; ++BaseIt) { 4728 if (BaseIt->getInheritConstructors()) { 4729 QualType Base = BaseIt->getType(); 4730 if (Base->isDependentType()) { 4731 // If we inherit constructors from anything that is dependent, just 4732 // abort processing altogether. We'll get another chance for the 4733 // instantiations. 4734 return; 4735 } 4736 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4737 } 4738 } 4739 if (BasesToInheritFrom.empty()) 4740 return; 4741 4742 // Now collect the constructors that we already have in the current class. 4743 // Those take precedence over inherited constructors. 4744 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4745 // unless there is a user-declared constructor with the same signature in 4746 // the class where the using-declaration appears. 4747 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4748 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4749 CtorE = ClassDecl->ctor_end(); 4750 CtorIt != CtorE; ++CtorIt) { 4751 ExistingConstructors.insert( 4752 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4753 } 4754 4755 Scope *S = getScopeForContext(ClassDecl); 4756 DeclarationName CreatedCtorName = 4757 Context.DeclarationNames.getCXXConstructorName( 4758 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4759 4760 // Now comes the true work. 4761 // First, we keep a map from constructor types to the base that introduced 4762 // them. Needed for finding conflicting constructors. We also keep the 4763 // actually inserted declarations in there, for pretty diagnostics. 4764 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4765 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4766 ConstructorToSourceMap InheritedConstructors; 4767 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4768 BaseE = BasesToInheritFrom.end(); 4769 BaseIt != BaseE; ++BaseIt) { 4770 const RecordType *Base = *BaseIt; 4771 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4772 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4773 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4774 CtorE = BaseDecl->ctor_end(); 4775 CtorIt != CtorE; ++CtorIt) { 4776 // Find the using declaration for inheriting this base's constructors. 4777 DeclarationName Name = 4778 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4779 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4780 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4781 SourceLocation UsingLoc = UD ? UD->getLocation() : 4782 ClassDecl->getLocation(); 4783 4784 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4785 // from the class X named in the using-declaration consists of actual 4786 // constructors and notional constructors that result from the 4787 // transformation of defaulted parameters as follows: 4788 // - all non-template default constructors of X, and 4789 // - for each non-template constructor of X that has at least one 4790 // parameter with a default argument, the set of constructors that 4791 // results from omitting any ellipsis parameter specification and 4792 // successively omitting parameters with a default argument from the 4793 // end of the parameter-type-list. 4794 CXXConstructorDecl *BaseCtor = *CtorIt; 4795 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4796 const FunctionProtoType *BaseCtorType = 4797 BaseCtor->getType()->getAs<FunctionProtoType>(); 4798 4799 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4800 maxParams = BaseCtor->getNumParams(); 4801 params <= maxParams; ++params) { 4802 // Skip default constructors. They're never inherited. 4803 if (params == 0) 4804 continue; 4805 // Skip copy and move constructors for the same reason. 4806 if (CanBeCopyOrMove && params == 1) 4807 continue; 4808 4809 // Build up a function type for this particular constructor. 4810 // FIXME: The working paper does not consider that the exception spec 4811 // for the inheriting constructor might be larger than that of the 4812 // source. This code doesn't yet, either. 4813 const Type *NewCtorType; 4814 if (params == maxParams) 4815 NewCtorType = BaseCtorType; 4816 else { 4817 llvm::SmallVector<QualType, 16> Args; 4818 for (unsigned i = 0; i < params; ++i) { 4819 Args.push_back(BaseCtorType->getArgType(i)); 4820 } 4821 FunctionProtoType::ExtProtoInfo ExtInfo = 4822 BaseCtorType->getExtProtoInfo(); 4823 ExtInfo.Variadic = false; 4824 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4825 Args.data(), params, ExtInfo) 4826 .getTypePtr(); 4827 } 4828 const Type *CanonicalNewCtorType = 4829 Context.getCanonicalType(NewCtorType); 4830 4831 // Now that we have the type, first check if the class already has a 4832 // constructor with this signature. 4833 if (ExistingConstructors.count(CanonicalNewCtorType)) 4834 continue; 4835 4836 // Then we check if we have already declared an inherited constructor 4837 // with this signature. 4838 std::pair<ConstructorToSourceMap::iterator, bool> result = 4839 InheritedConstructors.insert(std::make_pair( 4840 CanonicalNewCtorType, 4841 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4842 if (!result.second) { 4843 // Already in the map. If it came from a different class, that's an 4844 // error. Not if it's from the same. 4845 CanQualType PreviousBase = result.first->second.first; 4846 if (CanonicalBase != PreviousBase) { 4847 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4848 const CXXConstructorDecl *PrevBaseCtor = 4849 PrevCtor->getInheritedConstructor(); 4850 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4851 4852 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4853 Diag(BaseCtor->getLocation(), 4854 diag::note_using_decl_constructor_conflict_current_ctor); 4855 Diag(PrevBaseCtor->getLocation(), 4856 diag::note_using_decl_constructor_conflict_previous_ctor); 4857 Diag(PrevCtor->getLocation(), 4858 diag::note_using_decl_constructor_conflict_previous_using); 4859 } 4860 continue; 4861 } 4862 4863 // OK, we're there, now add the constructor. 4864 // C++0x [class.inhctor]p8: [...] that would be performed by a 4865 // user-writtern inline constructor [...] 4866 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4867 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4868 Context, ClassDecl, DNI, QualType(NewCtorType, 0), /*TInfo=*/0, 4869 BaseCtor->isExplicit(), /*Inline=*/true, 4870 /*ImplicitlyDeclared=*/true); 4871 NewCtor->setAccess(BaseCtor->getAccess()); 4872 4873 // Build up the parameter decls and add them. 4874 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4875 for (unsigned i = 0; i < params; ++i) { 4876 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, UsingLoc, 4877 /*IdentifierInfo=*/0, 4878 BaseCtorType->getArgType(i), 4879 /*TInfo=*/0, SC_None, 4880 SC_None, /*DefaultArg=*/0)); 4881 } 4882 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4883 NewCtor->setInheritedConstructor(BaseCtor); 4884 4885 PushOnScopeChains(NewCtor, S, false); 4886 ClassDecl->addDecl(NewCtor); 4887 result.first->second.second = NewCtor; 4888 } 4889 } 4890 } 4891} 4892 4893CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4894 // C++ [class.dtor]p2: 4895 // If a class has no user-declared destructor, a destructor is 4896 // declared implicitly. An implicitly-declared destructor is an 4897 // inline public member of its class. 4898 4899 // C++ [except.spec]p14: 4900 // An implicitly declared special member function (Clause 12) shall have 4901 // an exception-specification. 4902 ImplicitExceptionSpecification ExceptSpec(Context); 4903 4904 // Direct base-class destructors. 4905 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4906 BEnd = ClassDecl->bases_end(); 4907 B != BEnd; ++B) { 4908 if (B->isVirtual()) // Handled below. 4909 continue; 4910 4911 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4912 ExceptSpec.CalledDecl( 4913 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4914 } 4915 4916 // Virtual base-class destructors. 4917 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4918 BEnd = ClassDecl->vbases_end(); 4919 B != BEnd; ++B) { 4920 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4921 ExceptSpec.CalledDecl( 4922 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4923 } 4924 4925 // Field destructors. 4926 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4927 FEnd = ClassDecl->field_end(); 4928 F != FEnd; ++F) { 4929 if (const RecordType *RecordTy 4930 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4931 ExceptSpec.CalledDecl( 4932 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4933 } 4934 4935 // Create the actual destructor declaration. 4936 FunctionProtoType::ExtProtoInfo EPI; 4937 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4938 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4939 EPI.NumExceptions = ExceptSpec.size(); 4940 EPI.Exceptions = ExceptSpec.data(); 4941 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4942 4943 CanQualType ClassType 4944 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4945 DeclarationName Name 4946 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4947 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4948 CXXDestructorDecl *Destructor 4949 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4950 /*isInline=*/true, 4951 /*isImplicitlyDeclared=*/true); 4952 Destructor->setAccess(AS_public); 4953 Destructor->setImplicit(); 4954 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4955 4956 // Note that we have declared this destructor. 4957 ++ASTContext::NumImplicitDestructorsDeclared; 4958 4959 // Introduce this destructor into its scope. 4960 if (Scope *S = getScopeForContext(ClassDecl)) 4961 PushOnScopeChains(Destructor, S, false); 4962 ClassDecl->addDecl(Destructor); 4963 4964 // This could be uniqued if it ever proves significant. 4965 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4966 4967 AddOverriddenMethods(ClassDecl, Destructor); 4968 4969 return Destructor; 4970} 4971 4972void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4973 CXXDestructorDecl *Destructor) { 4974 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4975 "DefineImplicitDestructor - call it for implicit default dtor"); 4976 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4977 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4978 4979 if (Destructor->isInvalidDecl()) 4980 return; 4981 4982 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4983 4984 DiagnosticErrorTrap Trap(Diags); 4985 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4986 Destructor->getParent()); 4987 4988 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4989 Diag(CurrentLocation, diag::note_member_synthesized_at) 4990 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4991 4992 Destructor->setInvalidDecl(); 4993 return; 4994 } 4995 4996 SourceLocation Loc = Destructor->getLocation(); 4997 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4998 4999 Destructor->setUsed(); 5000 MarkVTableUsed(CurrentLocation, ClassDecl); 5001} 5002 5003/// \brief Builds a statement that copies the given entity from \p From to 5004/// \c To. 5005/// 5006/// This routine is used to copy the members of a class with an 5007/// implicitly-declared copy assignment operator. When the entities being 5008/// copied are arrays, this routine builds for loops to copy them. 5009/// 5010/// \param S The Sema object used for type-checking. 5011/// 5012/// \param Loc The location where the implicit copy is being generated. 5013/// 5014/// \param T The type of the expressions being copied. Both expressions must 5015/// have this type. 5016/// 5017/// \param To The expression we are copying to. 5018/// 5019/// \param From The expression we are copying from. 5020/// 5021/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5022/// Otherwise, it's a non-static member subobject. 5023/// 5024/// \param Depth Internal parameter recording the depth of the recursion. 5025/// 5026/// \returns A statement or a loop that copies the expressions. 5027static StmtResult 5028BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5029 Expr *To, Expr *From, 5030 bool CopyingBaseSubobject, unsigned Depth = 0) { 5031 // C++0x [class.copy]p30: 5032 // Each subobject is assigned in the manner appropriate to its type: 5033 // 5034 // - if the subobject is of class type, the copy assignment operator 5035 // for the class is used (as if by explicit qualification; that is, 5036 // ignoring any possible virtual overriding functions in more derived 5037 // classes); 5038 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5039 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5040 5041 // Look for operator=. 5042 DeclarationName Name 5043 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5044 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5045 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5046 5047 // Filter out any result that isn't a copy-assignment operator. 5048 LookupResult::Filter F = OpLookup.makeFilter(); 5049 while (F.hasNext()) { 5050 NamedDecl *D = F.next(); 5051 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5052 if (Method->isCopyAssignmentOperator()) 5053 continue; 5054 5055 F.erase(); 5056 } 5057 F.done(); 5058 5059 // Suppress the protected check (C++ [class.protected]) for each of the 5060 // assignment operators we found. This strange dance is required when 5061 // we're assigning via a base classes's copy-assignment operator. To 5062 // ensure that we're getting the right base class subobject (without 5063 // ambiguities), we need to cast "this" to that subobject type; to 5064 // ensure that we don't go through the virtual call mechanism, we need 5065 // to qualify the operator= name with the base class (see below). However, 5066 // this means that if the base class has a protected copy assignment 5067 // operator, the protected member access check will fail. So, we 5068 // rewrite "protected" access to "public" access in this case, since we 5069 // know by construction that we're calling from a derived class. 5070 if (CopyingBaseSubobject) { 5071 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5072 L != LEnd; ++L) { 5073 if (L.getAccess() == AS_protected) 5074 L.setAccess(AS_public); 5075 } 5076 } 5077 5078 // Create the nested-name-specifier that will be used to qualify the 5079 // reference to operator=; this is required to suppress the virtual 5080 // call mechanism. 5081 CXXScopeSpec SS; 5082 SS.setRange(Loc); 5083 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 5084 T.getTypePtr())); 5085 5086 // Create the reference to operator=. 5087 ExprResult OpEqualRef 5088 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5089 /*FirstQualifierInScope=*/0, OpLookup, 5090 /*TemplateArgs=*/0, 5091 /*SuppressQualifierCheck=*/true); 5092 if (OpEqualRef.isInvalid()) 5093 return StmtError(); 5094 5095 // Build the call to the assignment operator. 5096 5097 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5098 OpEqualRef.takeAs<Expr>(), 5099 Loc, &From, 1, Loc); 5100 if (Call.isInvalid()) 5101 return StmtError(); 5102 5103 return S.Owned(Call.takeAs<Stmt>()); 5104 } 5105 5106 // - if the subobject is of scalar type, the built-in assignment 5107 // operator is used. 5108 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5109 if (!ArrayTy) { 5110 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5111 if (Assignment.isInvalid()) 5112 return StmtError(); 5113 5114 return S.Owned(Assignment.takeAs<Stmt>()); 5115 } 5116 5117 // - if the subobject is an array, each element is assigned, in the 5118 // manner appropriate to the element type; 5119 5120 // Construct a loop over the array bounds, e.g., 5121 // 5122 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5123 // 5124 // that will copy each of the array elements. 5125 QualType SizeType = S.Context.getSizeType(); 5126 5127 // Create the iteration variable. 5128 IdentifierInfo *IterationVarName = 0; 5129 { 5130 llvm::SmallString<8> Str; 5131 llvm::raw_svector_ostream OS(Str); 5132 OS << "__i" << Depth; 5133 IterationVarName = &S.Context.Idents.get(OS.str()); 5134 } 5135 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 5136 IterationVarName, SizeType, 5137 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5138 SC_None, SC_None); 5139 5140 // Initialize the iteration variable to zero. 5141 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5142 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5143 5144 // Create a reference to the iteration variable; we'll use this several 5145 // times throughout. 5146 Expr *IterationVarRef 5147 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5148 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5149 5150 // Create the DeclStmt that holds the iteration variable. 5151 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5152 5153 // Create the comparison against the array bound. 5154 llvm::APInt Upper 5155 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5156 Expr *Comparison 5157 = new (S.Context) BinaryOperator(IterationVarRef, 5158 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5159 BO_NE, S.Context.BoolTy, 5160 VK_RValue, OK_Ordinary, Loc); 5161 5162 // Create the pre-increment of the iteration variable. 5163 Expr *Increment 5164 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5165 VK_LValue, OK_Ordinary, Loc); 5166 5167 // Subscript the "from" and "to" expressions with the iteration variable. 5168 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5169 IterationVarRef, Loc)); 5170 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5171 IterationVarRef, Loc)); 5172 5173 // Build the copy for an individual element of the array. 5174 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5175 To, From, CopyingBaseSubobject, 5176 Depth + 1); 5177 if (Copy.isInvalid()) 5178 return StmtError(); 5179 5180 // Construct the loop that copies all elements of this array. 5181 return S.ActOnForStmt(Loc, Loc, InitStmt, 5182 S.MakeFullExpr(Comparison), 5183 0, S.MakeFullExpr(Increment), 5184 Loc, Copy.take()); 5185} 5186 5187/// \brief Determine whether the given class has a copy assignment operator 5188/// that accepts a const-qualified argument. 5189static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5190 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5191 5192 if (!Class->hasDeclaredCopyAssignment()) 5193 S.DeclareImplicitCopyAssignment(Class); 5194 5195 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5196 DeclarationName OpName 5197 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5198 5199 DeclContext::lookup_const_iterator Op, OpEnd; 5200 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5201 // C++ [class.copy]p9: 5202 // A user-declared copy assignment operator is a non-static non-template 5203 // member function of class X with exactly one parameter of type X, X&, 5204 // const X&, volatile X& or const volatile X&. 5205 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5206 if (!Method) 5207 continue; 5208 5209 if (Method->isStatic()) 5210 continue; 5211 if (Method->getPrimaryTemplate()) 5212 continue; 5213 const FunctionProtoType *FnType = 5214 Method->getType()->getAs<FunctionProtoType>(); 5215 assert(FnType && "Overloaded operator has no prototype."); 5216 // Don't assert on this; an invalid decl might have been left in the AST. 5217 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5218 continue; 5219 bool AcceptsConst = true; 5220 QualType ArgType = FnType->getArgType(0); 5221 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5222 ArgType = Ref->getPointeeType(); 5223 // Is it a non-const lvalue reference? 5224 if (!ArgType.isConstQualified()) 5225 AcceptsConst = false; 5226 } 5227 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5228 continue; 5229 5230 // We have a single argument of type cv X or cv X&, i.e. we've found the 5231 // copy assignment operator. Return whether it accepts const arguments. 5232 return AcceptsConst; 5233 } 5234 assert(Class->isInvalidDecl() && 5235 "No copy assignment operator declared in valid code."); 5236 return false; 5237} 5238 5239CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5240 // Note: The following rules are largely analoguous to the copy 5241 // constructor rules. Note that virtual bases are not taken into account 5242 // for determining the argument type of the operator. Note also that 5243 // operators taking an object instead of a reference are allowed. 5244 5245 5246 // C++ [class.copy]p10: 5247 // If the class definition does not explicitly declare a copy 5248 // assignment operator, one is declared implicitly. 5249 // The implicitly-defined copy assignment operator for a class X 5250 // will have the form 5251 // 5252 // X& X::operator=(const X&) 5253 // 5254 // if 5255 bool HasConstCopyAssignment = true; 5256 5257 // -- each direct base class B of X has a copy assignment operator 5258 // whose parameter is of type const B&, const volatile B& or B, 5259 // and 5260 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5261 BaseEnd = ClassDecl->bases_end(); 5262 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5263 assert(!Base->getType()->isDependentType() && 5264 "Cannot generate implicit members for class with dependent bases."); 5265 const CXXRecordDecl *BaseClassDecl 5266 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5267 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5268 } 5269 5270 // -- for all the nonstatic data members of X that are of a class 5271 // type M (or array thereof), each such class type has a copy 5272 // assignment operator whose parameter is of type const M&, 5273 // const volatile M& or M. 5274 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5275 FieldEnd = ClassDecl->field_end(); 5276 HasConstCopyAssignment && Field != FieldEnd; 5277 ++Field) { 5278 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5279 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5280 const CXXRecordDecl *FieldClassDecl 5281 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5282 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5283 } 5284 } 5285 5286 // Otherwise, the implicitly declared copy assignment operator will 5287 // have the form 5288 // 5289 // X& X::operator=(X&) 5290 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5291 QualType RetType = Context.getLValueReferenceType(ArgType); 5292 if (HasConstCopyAssignment) 5293 ArgType = ArgType.withConst(); 5294 ArgType = Context.getLValueReferenceType(ArgType); 5295 5296 // C++ [except.spec]p14: 5297 // An implicitly declared special member function (Clause 12) shall have an 5298 // exception-specification. [...] 5299 ImplicitExceptionSpecification ExceptSpec(Context); 5300 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5301 BaseEnd = ClassDecl->bases_end(); 5302 Base != BaseEnd; ++Base) { 5303 CXXRecordDecl *BaseClassDecl 5304 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5305 5306 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5307 DeclareImplicitCopyAssignment(BaseClassDecl); 5308 5309 if (CXXMethodDecl *CopyAssign 5310 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5311 ExceptSpec.CalledDecl(CopyAssign); 5312 } 5313 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5314 FieldEnd = ClassDecl->field_end(); 5315 Field != FieldEnd; 5316 ++Field) { 5317 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5318 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5319 CXXRecordDecl *FieldClassDecl 5320 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5321 5322 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5323 DeclareImplicitCopyAssignment(FieldClassDecl); 5324 5325 if (CXXMethodDecl *CopyAssign 5326 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5327 ExceptSpec.CalledDecl(CopyAssign); 5328 } 5329 } 5330 5331 // An implicitly-declared copy assignment operator is an inline public 5332 // member of its class. 5333 FunctionProtoType::ExtProtoInfo EPI; 5334 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5335 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5336 EPI.NumExceptions = ExceptSpec.size(); 5337 EPI.Exceptions = ExceptSpec.data(); 5338 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5339 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5340 CXXMethodDecl *CopyAssignment 5341 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5342 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5343 /*TInfo=*/0, /*isStatic=*/false, 5344 /*StorageClassAsWritten=*/SC_None, 5345 /*isInline=*/true); 5346 CopyAssignment->setAccess(AS_public); 5347 CopyAssignment->setImplicit(); 5348 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5349 5350 // Add the parameter to the operator. 5351 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5352 ClassDecl->getLocation(), 5353 /*Id=*/0, 5354 ArgType, /*TInfo=*/0, 5355 SC_None, 5356 SC_None, 0); 5357 CopyAssignment->setParams(&FromParam, 1); 5358 5359 // Note that we have added this copy-assignment operator. 5360 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5361 5362 if (Scope *S = getScopeForContext(ClassDecl)) 5363 PushOnScopeChains(CopyAssignment, S, false); 5364 ClassDecl->addDecl(CopyAssignment); 5365 5366 AddOverriddenMethods(ClassDecl, CopyAssignment); 5367 return CopyAssignment; 5368} 5369 5370void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5371 CXXMethodDecl *CopyAssignOperator) { 5372 assert((CopyAssignOperator->isImplicit() && 5373 CopyAssignOperator->isOverloadedOperator() && 5374 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5375 !CopyAssignOperator->isUsed(false)) && 5376 "DefineImplicitCopyAssignment called for wrong function"); 5377 5378 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5379 5380 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5381 CopyAssignOperator->setInvalidDecl(); 5382 return; 5383 } 5384 5385 CopyAssignOperator->setUsed(); 5386 5387 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5388 DiagnosticErrorTrap Trap(Diags); 5389 5390 // C++0x [class.copy]p30: 5391 // The implicitly-defined or explicitly-defaulted copy assignment operator 5392 // for a non-union class X performs memberwise copy assignment of its 5393 // subobjects. The direct base classes of X are assigned first, in the 5394 // order of their declaration in the base-specifier-list, and then the 5395 // immediate non-static data members of X are assigned, in the order in 5396 // which they were declared in the class definition. 5397 5398 // The statements that form the synthesized function body. 5399 ASTOwningVector<Stmt*> Statements(*this); 5400 5401 // The parameter for the "other" object, which we are copying from. 5402 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5403 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5404 QualType OtherRefType = Other->getType(); 5405 if (const LValueReferenceType *OtherRef 5406 = OtherRefType->getAs<LValueReferenceType>()) { 5407 OtherRefType = OtherRef->getPointeeType(); 5408 OtherQuals = OtherRefType.getQualifiers(); 5409 } 5410 5411 // Our location for everything implicitly-generated. 5412 SourceLocation Loc = CopyAssignOperator->getLocation(); 5413 5414 // Construct a reference to the "other" object. We'll be using this 5415 // throughout the generated ASTs. 5416 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5417 assert(OtherRef && "Reference to parameter cannot fail!"); 5418 5419 // Construct the "this" pointer. We'll be using this throughout the generated 5420 // ASTs. 5421 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5422 assert(This && "Reference to this cannot fail!"); 5423 5424 // Assign base classes. 5425 bool Invalid = false; 5426 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5427 E = ClassDecl->bases_end(); Base != E; ++Base) { 5428 // Form the assignment: 5429 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5430 QualType BaseType = Base->getType().getUnqualifiedType(); 5431 if (!BaseType->isRecordType()) { 5432 Invalid = true; 5433 continue; 5434 } 5435 5436 CXXCastPath BasePath; 5437 BasePath.push_back(Base); 5438 5439 // Construct the "from" expression, which is an implicit cast to the 5440 // appropriately-qualified base type. 5441 Expr *From = OtherRef; 5442 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5443 CK_UncheckedDerivedToBase, 5444 VK_LValue, &BasePath); 5445 5446 // Dereference "this". 5447 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5448 5449 // Implicitly cast "this" to the appropriately-qualified base type. 5450 Expr *ToE = To.takeAs<Expr>(); 5451 ImpCastExprToType(ToE, 5452 Context.getCVRQualifiedType(BaseType, 5453 CopyAssignOperator->getTypeQualifiers()), 5454 CK_UncheckedDerivedToBase, 5455 VK_LValue, &BasePath); 5456 To = Owned(ToE); 5457 5458 // Build the copy. 5459 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5460 To.get(), From, 5461 /*CopyingBaseSubobject=*/true); 5462 if (Copy.isInvalid()) { 5463 Diag(CurrentLocation, diag::note_member_synthesized_at) 5464 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5465 CopyAssignOperator->setInvalidDecl(); 5466 return; 5467 } 5468 5469 // Success! Record the copy. 5470 Statements.push_back(Copy.takeAs<Expr>()); 5471 } 5472 5473 // \brief Reference to the __builtin_memcpy function. 5474 Expr *BuiltinMemCpyRef = 0; 5475 // \brief Reference to the __builtin_objc_memmove_collectable function. 5476 Expr *CollectableMemCpyRef = 0; 5477 5478 // Assign non-static members. 5479 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5480 FieldEnd = ClassDecl->field_end(); 5481 Field != FieldEnd; ++Field) { 5482 // Check for members of reference type; we can't copy those. 5483 if (Field->getType()->isReferenceType()) { 5484 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5485 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5486 Diag(Field->getLocation(), diag::note_declared_at); 5487 Diag(CurrentLocation, diag::note_member_synthesized_at) 5488 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5489 Invalid = true; 5490 continue; 5491 } 5492 5493 // Check for members of const-qualified, non-class type. 5494 QualType BaseType = Context.getBaseElementType(Field->getType()); 5495 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5496 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5497 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5498 Diag(Field->getLocation(), diag::note_declared_at); 5499 Diag(CurrentLocation, diag::note_member_synthesized_at) 5500 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5501 Invalid = true; 5502 continue; 5503 } 5504 5505 QualType FieldType = Field->getType().getNonReferenceType(); 5506 if (FieldType->isIncompleteArrayType()) { 5507 assert(ClassDecl->hasFlexibleArrayMember() && 5508 "Incomplete array type is not valid"); 5509 continue; 5510 } 5511 5512 // Build references to the field in the object we're copying from and to. 5513 CXXScopeSpec SS; // Intentionally empty 5514 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5515 LookupMemberName); 5516 MemberLookup.addDecl(*Field); 5517 MemberLookup.resolveKind(); 5518 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5519 Loc, /*IsArrow=*/false, 5520 SS, 0, MemberLookup, 0); 5521 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5522 Loc, /*IsArrow=*/true, 5523 SS, 0, MemberLookup, 0); 5524 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5525 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5526 5527 // If the field should be copied with __builtin_memcpy rather than via 5528 // explicit assignments, do so. This optimization only applies for arrays 5529 // of scalars and arrays of class type with trivial copy-assignment 5530 // operators. 5531 if (FieldType->isArrayType() && 5532 (!BaseType->isRecordType() || 5533 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5534 ->hasTrivialCopyAssignment())) { 5535 // Compute the size of the memory buffer to be copied. 5536 QualType SizeType = Context.getSizeType(); 5537 llvm::APInt Size(Context.getTypeSize(SizeType), 5538 Context.getTypeSizeInChars(BaseType).getQuantity()); 5539 for (const ConstantArrayType *Array 5540 = Context.getAsConstantArrayType(FieldType); 5541 Array; 5542 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5543 llvm::APInt ArraySize 5544 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5545 Size *= ArraySize; 5546 } 5547 5548 // Take the address of the field references for "from" and "to". 5549 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5550 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5551 5552 bool NeedsCollectableMemCpy = 5553 (BaseType->isRecordType() && 5554 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5555 5556 if (NeedsCollectableMemCpy) { 5557 if (!CollectableMemCpyRef) { 5558 // Create a reference to the __builtin_objc_memmove_collectable function. 5559 LookupResult R(*this, 5560 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5561 Loc, LookupOrdinaryName); 5562 LookupName(R, TUScope, true); 5563 5564 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5565 if (!CollectableMemCpy) { 5566 // Something went horribly wrong earlier, and we will have 5567 // complained about it. 5568 Invalid = true; 5569 continue; 5570 } 5571 5572 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5573 CollectableMemCpy->getType(), 5574 VK_LValue, Loc, 0).take(); 5575 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5576 } 5577 } 5578 // Create a reference to the __builtin_memcpy builtin function. 5579 else if (!BuiltinMemCpyRef) { 5580 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5581 LookupOrdinaryName); 5582 LookupName(R, TUScope, true); 5583 5584 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5585 if (!BuiltinMemCpy) { 5586 // Something went horribly wrong earlier, and we will have complained 5587 // about it. 5588 Invalid = true; 5589 continue; 5590 } 5591 5592 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5593 BuiltinMemCpy->getType(), 5594 VK_LValue, Loc, 0).take(); 5595 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5596 } 5597 5598 ASTOwningVector<Expr*> CallArgs(*this); 5599 CallArgs.push_back(To.takeAs<Expr>()); 5600 CallArgs.push_back(From.takeAs<Expr>()); 5601 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5602 ExprResult Call = ExprError(); 5603 if (NeedsCollectableMemCpy) 5604 Call = ActOnCallExpr(/*Scope=*/0, 5605 CollectableMemCpyRef, 5606 Loc, move_arg(CallArgs), 5607 Loc); 5608 else 5609 Call = ActOnCallExpr(/*Scope=*/0, 5610 BuiltinMemCpyRef, 5611 Loc, move_arg(CallArgs), 5612 Loc); 5613 5614 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5615 Statements.push_back(Call.takeAs<Expr>()); 5616 continue; 5617 } 5618 5619 // Build the copy of this field. 5620 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5621 To.get(), From.get(), 5622 /*CopyingBaseSubobject=*/false); 5623 if (Copy.isInvalid()) { 5624 Diag(CurrentLocation, diag::note_member_synthesized_at) 5625 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5626 CopyAssignOperator->setInvalidDecl(); 5627 return; 5628 } 5629 5630 // Success! Record the copy. 5631 Statements.push_back(Copy.takeAs<Stmt>()); 5632 } 5633 5634 if (!Invalid) { 5635 // Add a "return *this;" 5636 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5637 5638 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5639 if (Return.isInvalid()) 5640 Invalid = true; 5641 else { 5642 Statements.push_back(Return.takeAs<Stmt>()); 5643 5644 if (Trap.hasErrorOccurred()) { 5645 Diag(CurrentLocation, diag::note_member_synthesized_at) 5646 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5647 Invalid = true; 5648 } 5649 } 5650 } 5651 5652 if (Invalid) { 5653 CopyAssignOperator->setInvalidDecl(); 5654 return; 5655 } 5656 5657 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5658 /*isStmtExpr=*/false); 5659 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5660 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5661} 5662 5663CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5664 CXXRecordDecl *ClassDecl) { 5665 // C++ [class.copy]p4: 5666 // If the class definition does not explicitly declare a copy 5667 // constructor, one is declared implicitly. 5668 5669 // C++ [class.copy]p5: 5670 // The implicitly-declared copy constructor for a class X will 5671 // have the form 5672 // 5673 // X::X(const X&) 5674 // 5675 // if 5676 bool HasConstCopyConstructor = true; 5677 5678 // -- each direct or virtual base class B of X has a copy 5679 // constructor whose first parameter is of type const B& or 5680 // const volatile B&, and 5681 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5682 BaseEnd = ClassDecl->bases_end(); 5683 HasConstCopyConstructor && Base != BaseEnd; 5684 ++Base) { 5685 // Virtual bases are handled below. 5686 if (Base->isVirtual()) 5687 continue; 5688 5689 CXXRecordDecl *BaseClassDecl 5690 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5691 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5692 DeclareImplicitCopyConstructor(BaseClassDecl); 5693 5694 HasConstCopyConstructor 5695 = BaseClassDecl->hasConstCopyConstructor(Context); 5696 } 5697 5698 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5699 BaseEnd = ClassDecl->vbases_end(); 5700 HasConstCopyConstructor && Base != BaseEnd; 5701 ++Base) { 5702 CXXRecordDecl *BaseClassDecl 5703 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5704 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5705 DeclareImplicitCopyConstructor(BaseClassDecl); 5706 5707 HasConstCopyConstructor 5708 = BaseClassDecl->hasConstCopyConstructor(Context); 5709 } 5710 5711 // -- for all the nonstatic data members of X that are of a 5712 // class type M (or array thereof), each such class type 5713 // has a copy constructor whose first parameter is of type 5714 // const M& or const volatile M&. 5715 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5716 FieldEnd = ClassDecl->field_end(); 5717 HasConstCopyConstructor && Field != FieldEnd; 5718 ++Field) { 5719 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5720 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5721 CXXRecordDecl *FieldClassDecl 5722 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5723 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5724 DeclareImplicitCopyConstructor(FieldClassDecl); 5725 5726 HasConstCopyConstructor 5727 = FieldClassDecl->hasConstCopyConstructor(Context); 5728 } 5729 } 5730 5731 // Otherwise, the implicitly declared copy constructor will have 5732 // the form 5733 // 5734 // X::X(X&) 5735 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5736 QualType ArgType = ClassType; 5737 if (HasConstCopyConstructor) 5738 ArgType = ArgType.withConst(); 5739 ArgType = Context.getLValueReferenceType(ArgType); 5740 5741 // C++ [except.spec]p14: 5742 // An implicitly declared special member function (Clause 12) shall have an 5743 // exception-specification. [...] 5744 ImplicitExceptionSpecification ExceptSpec(Context); 5745 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5746 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5747 BaseEnd = ClassDecl->bases_end(); 5748 Base != BaseEnd; 5749 ++Base) { 5750 // Virtual bases are handled below. 5751 if (Base->isVirtual()) 5752 continue; 5753 5754 CXXRecordDecl *BaseClassDecl 5755 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5756 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5757 DeclareImplicitCopyConstructor(BaseClassDecl); 5758 5759 if (CXXConstructorDecl *CopyConstructor 5760 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5761 ExceptSpec.CalledDecl(CopyConstructor); 5762 } 5763 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5764 BaseEnd = ClassDecl->vbases_end(); 5765 Base != BaseEnd; 5766 ++Base) { 5767 CXXRecordDecl *BaseClassDecl 5768 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5769 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5770 DeclareImplicitCopyConstructor(BaseClassDecl); 5771 5772 if (CXXConstructorDecl *CopyConstructor 5773 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5774 ExceptSpec.CalledDecl(CopyConstructor); 5775 } 5776 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5777 FieldEnd = ClassDecl->field_end(); 5778 Field != FieldEnd; 5779 ++Field) { 5780 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5781 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5782 CXXRecordDecl *FieldClassDecl 5783 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5784 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5785 DeclareImplicitCopyConstructor(FieldClassDecl); 5786 5787 if (CXXConstructorDecl *CopyConstructor 5788 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5789 ExceptSpec.CalledDecl(CopyConstructor); 5790 } 5791 } 5792 5793 // An implicitly-declared copy constructor is an inline public 5794 // member of its class. 5795 FunctionProtoType::ExtProtoInfo EPI; 5796 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5797 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5798 EPI.NumExceptions = ExceptSpec.size(); 5799 EPI.Exceptions = ExceptSpec.data(); 5800 DeclarationName Name 5801 = Context.DeclarationNames.getCXXConstructorName( 5802 Context.getCanonicalType(ClassType)); 5803 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5804 CXXConstructorDecl *CopyConstructor 5805 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5806 Context.getFunctionType(Context.VoidTy, 5807 &ArgType, 1, EPI), 5808 /*TInfo=*/0, 5809 /*isExplicit=*/false, 5810 /*isInline=*/true, 5811 /*isImplicitlyDeclared=*/true); 5812 CopyConstructor->setAccess(AS_public); 5813 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5814 5815 // Note that we have declared this constructor. 5816 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5817 5818 // Add the parameter to the constructor. 5819 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5820 ClassDecl->getLocation(), 5821 /*IdentifierInfo=*/0, 5822 ArgType, /*TInfo=*/0, 5823 SC_None, 5824 SC_None, 0); 5825 CopyConstructor->setParams(&FromParam, 1); 5826 if (Scope *S = getScopeForContext(ClassDecl)) 5827 PushOnScopeChains(CopyConstructor, S, false); 5828 ClassDecl->addDecl(CopyConstructor); 5829 5830 return CopyConstructor; 5831} 5832 5833void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5834 CXXConstructorDecl *CopyConstructor, 5835 unsigned TypeQuals) { 5836 assert((CopyConstructor->isImplicit() && 5837 CopyConstructor->isCopyConstructor(TypeQuals) && 5838 !CopyConstructor->isUsed(false)) && 5839 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5840 5841 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5842 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5843 5844 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5845 DiagnosticErrorTrap Trap(Diags); 5846 5847 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5848 Trap.hasErrorOccurred()) { 5849 Diag(CurrentLocation, diag::note_member_synthesized_at) 5850 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5851 CopyConstructor->setInvalidDecl(); 5852 } else { 5853 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5854 CopyConstructor->getLocation(), 5855 MultiStmtArg(*this, 0, 0), 5856 /*isStmtExpr=*/false) 5857 .takeAs<Stmt>()); 5858 } 5859 5860 CopyConstructor->setUsed(); 5861} 5862 5863ExprResult 5864Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5865 CXXConstructorDecl *Constructor, 5866 MultiExprArg ExprArgs, 5867 bool RequiresZeroInit, 5868 unsigned ConstructKind, 5869 SourceRange ParenRange) { 5870 bool Elidable = false; 5871 5872 // C++0x [class.copy]p34: 5873 // When certain criteria are met, an implementation is allowed to 5874 // omit the copy/move construction of a class object, even if the 5875 // copy/move constructor and/or destructor for the object have 5876 // side effects. [...] 5877 // - when a temporary class object that has not been bound to a 5878 // reference (12.2) would be copied/moved to a class object 5879 // with the same cv-unqualified type, the copy/move operation 5880 // can be omitted by constructing the temporary object 5881 // directly into the target of the omitted copy/move 5882 if (ConstructKind == CXXConstructExpr::CK_Complete && 5883 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5884 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5885 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5886 } 5887 5888 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5889 Elidable, move(ExprArgs), RequiresZeroInit, 5890 ConstructKind, ParenRange); 5891} 5892 5893/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5894/// including handling of its default argument expressions. 5895ExprResult 5896Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5897 CXXConstructorDecl *Constructor, bool Elidable, 5898 MultiExprArg ExprArgs, 5899 bool RequiresZeroInit, 5900 unsigned ConstructKind, 5901 SourceRange ParenRange) { 5902 unsigned NumExprs = ExprArgs.size(); 5903 Expr **Exprs = (Expr **)ExprArgs.release(); 5904 5905 MarkDeclarationReferenced(ConstructLoc, Constructor); 5906 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5907 Constructor, Elidable, Exprs, NumExprs, 5908 RequiresZeroInit, 5909 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5910 ParenRange)); 5911} 5912 5913bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5914 CXXConstructorDecl *Constructor, 5915 MultiExprArg Exprs) { 5916 // FIXME: Provide the correct paren SourceRange when available. 5917 ExprResult TempResult = 5918 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5919 move(Exprs), false, CXXConstructExpr::CK_Complete, 5920 SourceRange()); 5921 if (TempResult.isInvalid()) 5922 return true; 5923 5924 Expr *Temp = TempResult.takeAs<Expr>(); 5925 CheckImplicitConversions(Temp, VD->getLocation()); 5926 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5927 Temp = MaybeCreateExprWithCleanups(Temp); 5928 VD->setInit(Temp); 5929 5930 return false; 5931} 5932 5933void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5934 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5935 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5936 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5937 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5938 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5939 CheckDestructorAccess(VD->getLocation(), Destructor, 5940 PDiag(diag::err_access_dtor_var) 5941 << VD->getDeclName() 5942 << VD->getType()); 5943 5944 // TODO: this should be re-enabled for static locals by !CXAAtExit 5945 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5946 Diag(VD->getLocation(), diag::warn_global_destructor); 5947 } 5948} 5949 5950/// AddCXXDirectInitializerToDecl - This action is called immediately after 5951/// ActOnDeclarator, when a C++ direct initializer is present. 5952/// e.g: "int x(1);" 5953void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5954 SourceLocation LParenLoc, 5955 MultiExprArg Exprs, 5956 SourceLocation RParenLoc) { 5957 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5958 5959 // If there is no declaration, there was an error parsing it. Just ignore 5960 // the initializer. 5961 if (RealDecl == 0) 5962 return; 5963 5964 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5965 if (!VDecl) { 5966 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5967 RealDecl->setInvalidDecl(); 5968 return; 5969 } 5970 5971 // We will represent direct-initialization similarly to copy-initialization: 5972 // int x(1); -as-> int x = 1; 5973 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5974 // 5975 // Clients that want to distinguish between the two forms, can check for 5976 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5977 // A major benefit is that clients that don't particularly care about which 5978 // exactly form was it (like the CodeGen) can handle both cases without 5979 // special case code. 5980 5981 // C++ 8.5p11: 5982 // The form of initialization (using parentheses or '=') is generally 5983 // insignificant, but does matter when the entity being initialized has a 5984 // class type. 5985 5986 if (!VDecl->getType()->isDependentType() && 5987 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5988 diag::err_typecheck_decl_incomplete_type)) { 5989 VDecl->setInvalidDecl(); 5990 return; 5991 } 5992 5993 // The variable can not have an abstract class type. 5994 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5995 diag::err_abstract_type_in_decl, 5996 AbstractVariableType)) 5997 VDecl->setInvalidDecl(); 5998 5999 const VarDecl *Def; 6000 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6001 Diag(VDecl->getLocation(), diag::err_redefinition) 6002 << VDecl->getDeclName(); 6003 Diag(Def->getLocation(), diag::note_previous_definition); 6004 VDecl->setInvalidDecl(); 6005 return; 6006 } 6007 6008 // C++ [class.static.data]p4 6009 // If a static data member is of const integral or const 6010 // enumeration type, its declaration in the class definition can 6011 // specify a constant-initializer which shall be an integral 6012 // constant expression (5.19). In that case, the member can appear 6013 // in integral constant expressions. The member shall still be 6014 // defined in a namespace scope if it is used in the program and the 6015 // namespace scope definition shall not contain an initializer. 6016 // 6017 // We already performed a redefinition check above, but for static 6018 // data members we also need to check whether there was an in-class 6019 // declaration with an initializer. 6020 const VarDecl* PrevInit = 0; 6021 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6022 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6023 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6024 return; 6025 } 6026 6027 bool IsDependent = false; 6028 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6029 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6030 VDecl->setInvalidDecl(); 6031 return; 6032 } 6033 6034 if (Exprs.get()[I]->isTypeDependent()) 6035 IsDependent = true; 6036 } 6037 6038 // If either the declaration has a dependent type or if any of the 6039 // expressions is type-dependent, we represent the initialization 6040 // via a ParenListExpr for later use during template instantiation. 6041 if (VDecl->getType()->isDependentType() || IsDependent) { 6042 // Let clients know that initialization was done with a direct initializer. 6043 VDecl->setCXXDirectInitializer(true); 6044 6045 // Store the initialization expressions as a ParenListExpr. 6046 unsigned NumExprs = Exprs.size(); 6047 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6048 (Expr **)Exprs.release(), 6049 NumExprs, RParenLoc)); 6050 return; 6051 } 6052 6053 // Capture the variable that is being initialized and the style of 6054 // initialization. 6055 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6056 6057 // FIXME: Poor source location information. 6058 InitializationKind Kind 6059 = InitializationKind::CreateDirect(VDecl->getLocation(), 6060 LParenLoc, RParenLoc); 6061 6062 InitializationSequence InitSeq(*this, Entity, Kind, 6063 Exprs.get(), Exprs.size()); 6064 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6065 if (Result.isInvalid()) { 6066 VDecl->setInvalidDecl(); 6067 return; 6068 } 6069 6070 CheckImplicitConversions(Result.get(), LParenLoc); 6071 6072 Result = MaybeCreateExprWithCleanups(Result); 6073 VDecl->setInit(Result.takeAs<Expr>()); 6074 VDecl->setCXXDirectInitializer(true); 6075 6076 CheckCompleteVariableDeclaration(VDecl); 6077} 6078 6079/// \brief Given a constructor and the set of arguments provided for the 6080/// constructor, convert the arguments and add any required default arguments 6081/// to form a proper call to this constructor. 6082/// 6083/// \returns true if an error occurred, false otherwise. 6084bool 6085Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6086 MultiExprArg ArgsPtr, 6087 SourceLocation Loc, 6088 ASTOwningVector<Expr*> &ConvertedArgs) { 6089 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6090 unsigned NumArgs = ArgsPtr.size(); 6091 Expr **Args = (Expr **)ArgsPtr.get(); 6092 6093 const FunctionProtoType *Proto 6094 = Constructor->getType()->getAs<FunctionProtoType>(); 6095 assert(Proto && "Constructor without a prototype?"); 6096 unsigned NumArgsInProto = Proto->getNumArgs(); 6097 6098 // If too few arguments are available, we'll fill in the rest with defaults. 6099 if (NumArgs < NumArgsInProto) 6100 ConvertedArgs.reserve(NumArgsInProto); 6101 else 6102 ConvertedArgs.reserve(NumArgs); 6103 6104 VariadicCallType CallType = 6105 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6106 llvm::SmallVector<Expr *, 8> AllArgs; 6107 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6108 Proto, 0, Args, NumArgs, AllArgs, 6109 CallType); 6110 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6111 ConvertedArgs.push_back(AllArgs[i]); 6112 return Invalid; 6113} 6114 6115static inline bool 6116CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6117 const FunctionDecl *FnDecl) { 6118 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6119 if (isa<NamespaceDecl>(DC)) { 6120 return SemaRef.Diag(FnDecl->getLocation(), 6121 diag::err_operator_new_delete_declared_in_namespace) 6122 << FnDecl->getDeclName(); 6123 } 6124 6125 if (isa<TranslationUnitDecl>(DC) && 6126 FnDecl->getStorageClass() == SC_Static) { 6127 return SemaRef.Diag(FnDecl->getLocation(), 6128 diag::err_operator_new_delete_declared_static) 6129 << FnDecl->getDeclName(); 6130 } 6131 6132 return false; 6133} 6134 6135static inline bool 6136CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6137 CanQualType ExpectedResultType, 6138 CanQualType ExpectedFirstParamType, 6139 unsigned DependentParamTypeDiag, 6140 unsigned InvalidParamTypeDiag) { 6141 QualType ResultType = 6142 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6143 6144 // Check that the result type is not dependent. 6145 if (ResultType->isDependentType()) 6146 return SemaRef.Diag(FnDecl->getLocation(), 6147 diag::err_operator_new_delete_dependent_result_type) 6148 << FnDecl->getDeclName() << ExpectedResultType; 6149 6150 // Check that the result type is what we expect. 6151 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6152 return SemaRef.Diag(FnDecl->getLocation(), 6153 diag::err_operator_new_delete_invalid_result_type) 6154 << FnDecl->getDeclName() << ExpectedResultType; 6155 6156 // A function template must have at least 2 parameters. 6157 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6158 return SemaRef.Diag(FnDecl->getLocation(), 6159 diag::err_operator_new_delete_template_too_few_parameters) 6160 << FnDecl->getDeclName(); 6161 6162 // The function decl must have at least 1 parameter. 6163 if (FnDecl->getNumParams() == 0) 6164 return SemaRef.Diag(FnDecl->getLocation(), 6165 diag::err_operator_new_delete_too_few_parameters) 6166 << FnDecl->getDeclName(); 6167 6168 // Check the the first parameter type is not dependent. 6169 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6170 if (FirstParamType->isDependentType()) 6171 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6172 << FnDecl->getDeclName() << ExpectedFirstParamType; 6173 6174 // Check that the first parameter type is what we expect. 6175 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6176 ExpectedFirstParamType) 6177 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6178 << FnDecl->getDeclName() << ExpectedFirstParamType; 6179 6180 return false; 6181} 6182 6183static bool 6184CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6185 // C++ [basic.stc.dynamic.allocation]p1: 6186 // A program is ill-formed if an allocation function is declared in a 6187 // namespace scope other than global scope or declared static in global 6188 // scope. 6189 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6190 return true; 6191 6192 CanQualType SizeTy = 6193 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6194 6195 // C++ [basic.stc.dynamic.allocation]p1: 6196 // The return type shall be void*. The first parameter shall have type 6197 // std::size_t. 6198 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6199 SizeTy, 6200 diag::err_operator_new_dependent_param_type, 6201 diag::err_operator_new_param_type)) 6202 return true; 6203 6204 // C++ [basic.stc.dynamic.allocation]p1: 6205 // The first parameter shall not have an associated default argument. 6206 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6207 return SemaRef.Diag(FnDecl->getLocation(), 6208 diag::err_operator_new_default_arg) 6209 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6210 6211 return false; 6212} 6213 6214static bool 6215CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6216 // C++ [basic.stc.dynamic.deallocation]p1: 6217 // A program is ill-formed if deallocation functions are declared in a 6218 // namespace scope other than global scope or declared static in global 6219 // scope. 6220 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6221 return true; 6222 6223 // C++ [basic.stc.dynamic.deallocation]p2: 6224 // Each deallocation function shall return void and its first parameter 6225 // shall be void*. 6226 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6227 SemaRef.Context.VoidPtrTy, 6228 diag::err_operator_delete_dependent_param_type, 6229 diag::err_operator_delete_param_type)) 6230 return true; 6231 6232 return false; 6233} 6234 6235/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6236/// of this overloaded operator is well-formed. If so, returns false; 6237/// otherwise, emits appropriate diagnostics and returns true. 6238bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6239 assert(FnDecl && FnDecl->isOverloadedOperator() && 6240 "Expected an overloaded operator declaration"); 6241 6242 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6243 6244 // C++ [over.oper]p5: 6245 // The allocation and deallocation functions, operator new, 6246 // operator new[], operator delete and operator delete[], are 6247 // described completely in 3.7.3. The attributes and restrictions 6248 // found in the rest of this subclause do not apply to them unless 6249 // explicitly stated in 3.7.3. 6250 if (Op == OO_Delete || Op == OO_Array_Delete) 6251 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6252 6253 if (Op == OO_New || Op == OO_Array_New) 6254 return CheckOperatorNewDeclaration(*this, FnDecl); 6255 6256 // C++ [over.oper]p6: 6257 // An operator function shall either be a non-static member 6258 // function or be a non-member function and have at least one 6259 // parameter whose type is a class, a reference to a class, an 6260 // enumeration, or a reference to an enumeration. 6261 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6262 if (MethodDecl->isStatic()) 6263 return Diag(FnDecl->getLocation(), 6264 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6265 } else { 6266 bool ClassOrEnumParam = false; 6267 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6268 ParamEnd = FnDecl->param_end(); 6269 Param != ParamEnd; ++Param) { 6270 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6271 if (ParamType->isDependentType() || ParamType->isRecordType() || 6272 ParamType->isEnumeralType()) { 6273 ClassOrEnumParam = true; 6274 break; 6275 } 6276 } 6277 6278 if (!ClassOrEnumParam) 6279 return Diag(FnDecl->getLocation(), 6280 diag::err_operator_overload_needs_class_or_enum) 6281 << FnDecl->getDeclName(); 6282 } 6283 6284 // C++ [over.oper]p8: 6285 // An operator function cannot have default arguments (8.3.6), 6286 // except where explicitly stated below. 6287 // 6288 // Only the function-call operator allows default arguments 6289 // (C++ [over.call]p1). 6290 if (Op != OO_Call) { 6291 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6292 Param != FnDecl->param_end(); ++Param) { 6293 if ((*Param)->hasDefaultArg()) 6294 return Diag((*Param)->getLocation(), 6295 diag::err_operator_overload_default_arg) 6296 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6297 } 6298 } 6299 6300 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6301 { false, false, false } 6302#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6303 , { Unary, Binary, MemberOnly } 6304#include "clang/Basic/OperatorKinds.def" 6305 }; 6306 6307 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6308 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6309 bool MustBeMemberOperator = OperatorUses[Op][2]; 6310 6311 // C++ [over.oper]p8: 6312 // [...] Operator functions cannot have more or fewer parameters 6313 // than the number required for the corresponding operator, as 6314 // described in the rest of this subclause. 6315 unsigned NumParams = FnDecl->getNumParams() 6316 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6317 if (Op != OO_Call && 6318 ((NumParams == 1 && !CanBeUnaryOperator) || 6319 (NumParams == 2 && !CanBeBinaryOperator) || 6320 (NumParams < 1) || (NumParams > 2))) { 6321 // We have the wrong number of parameters. 6322 unsigned ErrorKind; 6323 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6324 ErrorKind = 2; // 2 -> unary or binary. 6325 } else if (CanBeUnaryOperator) { 6326 ErrorKind = 0; // 0 -> unary 6327 } else { 6328 assert(CanBeBinaryOperator && 6329 "All non-call overloaded operators are unary or binary!"); 6330 ErrorKind = 1; // 1 -> binary 6331 } 6332 6333 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6334 << FnDecl->getDeclName() << NumParams << ErrorKind; 6335 } 6336 6337 // Overloaded operators other than operator() cannot be variadic. 6338 if (Op != OO_Call && 6339 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6340 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6341 << FnDecl->getDeclName(); 6342 } 6343 6344 // Some operators must be non-static member functions. 6345 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6346 return Diag(FnDecl->getLocation(), 6347 diag::err_operator_overload_must_be_member) 6348 << FnDecl->getDeclName(); 6349 } 6350 6351 // C++ [over.inc]p1: 6352 // The user-defined function called operator++ implements the 6353 // prefix and postfix ++ operator. If this function is a member 6354 // function with no parameters, or a non-member function with one 6355 // parameter of class or enumeration type, it defines the prefix 6356 // increment operator ++ for objects of that type. If the function 6357 // is a member function with one parameter (which shall be of type 6358 // int) or a non-member function with two parameters (the second 6359 // of which shall be of type int), it defines the postfix 6360 // increment operator ++ for objects of that type. 6361 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6362 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6363 bool ParamIsInt = false; 6364 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6365 ParamIsInt = BT->getKind() == BuiltinType::Int; 6366 6367 if (!ParamIsInt) 6368 return Diag(LastParam->getLocation(), 6369 diag::err_operator_overload_post_incdec_must_be_int) 6370 << LastParam->getType() << (Op == OO_MinusMinus); 6371 } 6372 6373 return false; 6374} 6375 6376/// CheckLiteralOperatorDeclaration - Check whether the declaration 6377/// of this literal operator function is well-formed. If so, returns 6378/// false; otherwise, emits appropriate diagnostics and returns true. 6379bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6380 DeclContext *DC = FnDecl->getDeclContext(); 6381 Decl::Kind Kind = DC->getDeclKind(); 6382 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6383 Kind != Decl::LinkageSpec) { 6384 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6385 << FnDecl->getDeclName(); 6386 return true; 6387 } 6388 6389 bool Valid = false; 6390 6391 // template <char...> type operator "" name() is the only valid template 6392 // signature, and the only valid signature with no parameters. 6393 if (FnDecl->param_size() == 0) { 6394 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6395 // Must have only one template parameter 6396 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6397 if (Params->size() == 1) { 6398 NonTypeTemplateParmDecl *PmDecl = 6399 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6400 6401 // The template parameter must be a char parameter pack. 6402 if (PmDecl && PmDecl->isTemplateParameterPack() && 6403 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6404 Valid = true; 6405 } 6406 } 6407 } else { 6408 // Check the first parameter 6409 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6410 6411 QualType T = (*Param)->getType(); 6412 6413 // unsigned long long int, long double, and any character type are allowed 6414 // as the only parameters. 6415 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6416 Context.hasSameType(T, Context.LongDoubleTy) || 6417 Context.hasSameType(T, Context.CharTy) || 6418 Context.hasSameType(T, Context.WCharTy) || 6419 Context.hasSameType(T, Context.Char16Ty) || 6420 Context.hasSameType(T, Context.Char32Ty)) { 6421 if (++Param == FnDecl->param_end()) 6422 Valid = true; 6423 goto FinishedParams; 6424 } 6425 6426 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6427 const PointerType *PT = T->getAs<PointerType>(); 6428 if (!PT) 6429 goto FinishedParams; 6430 T = PT->getPointeeType(); 6431 if (!T.isConstQualified()) 6432 goto FinishedParams; 6433 T = T.getUnqualifiedType(); 6434 6435 // Move on to the second parameter; 6436 ++Param; 6437 6438 // If there is no second parameter, the first must be a const char * 6439 if (Param == FnDecl->param_end()) { 6440 if (Context.hasSameType(T, Context.CharTy)) 6441 Valid = true; 6442 goto FinishedParams; 6443 } 6444 6445 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6446 // are allowed as the first parameter to a two-parameter function 6447 if (!(Context.hasSameType(T, Context.CharTy) || 6448 Context.hasSameType(T, Context.WCharTy) || 6449 Context.hasSameType(T, Context.Char16Ty) || 6450 Context.hasSameType(T, Context.Char32Ty))) 6451 goto FinishedParams; 6452 6453 // The second and final parameter must be an std::size_t 6454 T = (*Param)->getType().getUnqualifiedType(); 6455 if (Context.hasSameType(T, Context.getSizeType()) && 6456 ++Param == FnDecl->param_end()) 6457 Valid = true; 6458 } 6459 6460 // FIXME: This diagnostic is absolutely terrible. 6461FinishedParams: 6462 if (!Valid) { 6463 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6464 << FnDecl->getDeclName(); 6465 return true; 6466 } 6467 6468 return false; 6469} 6470 6471/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6472/// linkage specification, including the language and (if present) 6473/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6474/// the location of the language string literal, which is provided 6475/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6476/// the '{' brace. Otherwise, this linkage specification does not 6477/// have any braces. 6478Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6479 SourceLocation LangLoc, 6480 llvm::StringRef Lang, 6481 SourceLocation LBraceLoc) { 6482 LinkageSpecDecl::LanguageIDs Language; 6483 if (Lang == "\"C\"") 6484 Language = LinkageSpecDecl::lang_c; 6485 else if (Lang == "\"C++\"") 6486 Language = LinkageSpecDecl::lang_cxx; 6487 else { 6488 Diag(LangLoc, diag::err_bad_language); 6489 return 0; 6490 } 6491 6492 // FIXME: Add all the various semantics of linkage specifications 6493 6494 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6495 LangLoc, Language, 6496 LBraceLoc.isValid()); 6497 CurContext->addDecl(D); 6498 PushDeclContext(S, D); 6499 return D; 6500} 6501 6502/// ActOnFinishLinkageSpecification - Complete the definition of 6503/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6504/// valid, it's the position of the closing '}' brace in a linkage 6505/// specification that uses braces. 6506Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6507 Decl *LinkageSpec, 6508 SourceLocation RBraceLoc) { 6509 if (LinkageSpec) 6510 PopDeclContext(); 6511 return LinkageSpec; 6512} 6513 6514/// \brief Perform semantic analysis for the variable declaration that 6515/// occurs within a C++ catch clause, returning the newly-created 6516/// variable. 6517VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6518 TypeSourceInfo *TInfo, 6519 IdentifierInfo *Name, 6520 SourceLocation Loc) { 6521 bool Invalid = false; 6522 QualType ExDeclType = TInfo->getType(); 6523 6524 // Arrays and functions decay. 6525 if (ExDeclType->isArrayType()) 6526 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6527 else if (ExDeclType->isFunctionType()) 6528 ExDeclType = Context.getPointerType(ExDeclType); 6529 6530 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6531 // The exception-declaration shall not denote a pointer or reference to an 6532 // incomplete type, other than [cv] void*. 6533 // N2844 forbids rvalue references. 6534 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6535 Diag(Loc, diag::err_catch_rvalue_ref); 6536 Invalid = true; 6537 } 6538 6539 // GCC allows catching pointers and references to incomplete types 6540 // as an extension; so do we, but we warn by default. 6541 6542 QualType BaseType = ExDeclType; 6543 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6544 unsigned DK = diag::err_catch_incomplete; 6545 bool IncompleteCatchIsInvalid = true; 6546 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6547 BaseType = Ptr->getPointeeType(); 6548 Mode = 1; 6549 DK = diag::ext_catch_incomplete_ptr; 6550 IncompleteCatchIsInvalid = false; 6551 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6552 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6553 BaseType = Ref->getPointeeType(); 6554 Mode = 2; 6555 DK = diag::ext_catch_incomplete_ref; 6556 IncompleteCatchIsInvalid = false; 6557 } 6558 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6559 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6560 IncompleteCatchIsInvalid) 6561 Invalid = true; 6562 6563 if (!Invalid && !ExDeclType->isDependentType() && 6564 RequireNonAbstractType(Loc, ExDeclType, 6565 diag::err_abstract_type_in_decl, 6566 AbstractVariableType)) 6567 Invalid = true; 6568 6569 // Only the non-fragile NeXT runtime currently supports C++ catches 6570 // of ObjC types, and no runtime supports catching ObjC types by value. 6571 if (!Invalid && getLangOptions().ObjC1) { 6572 QualType T = ExDeclType; 6573 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6574 T = RT->getPointeeType(); 6575 6576 if (T->isObjCObjectType()) { 6577 Diag(Loc, diag::err_objc_object_catch); 6578 Invalid = true; 6579 } else if (T->isObjCObjectPointerType()) { 6580 if (!getLangOptions().NeXTRuntime) { 6581 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6582 Invalid = true; 6583 } else if (!getLangOptions().ObjCNonFragileABI) { 6584 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6585 Invalid = true; 6586 } 6587 } 6588 } 6589 6590 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6591 Name, ExDeclType, TInfo, SC_None, 6592 SC_None); 6593 ExDecl->setExceptionVariable(true); 6594 6595 if (!Invalid) { 6596 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6597 // C++ [except.handle]p16: 6598 // The object declared in an exception-declaration or, if the 6599 // exception-declaration does not specify a name, a temporary (12.2) is 6600 // copy-initialized (8.5) from the exception object. [...] 6601 // The object is destroyed when the handler exits, after the destruction 6602 // of any automatic objects initialized within the handler. 6603 // 6604 // We just pretend to initialize the object with itself, then make sure 6605 // it can be destroyed later. 6606 QualType initType = ExDeclType; 6607 6608 InitializedEntity entity = 6609 InitializedEntity::InitializeVariable(ExDecl); 6610 InitializationKind initKind = 6611 InitializationKind::CreateCopy(Loc, SourceLocation()); 6612 6613 Expr *opaqueValue = 6614 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6615 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6616 ExprResult result = sequence.Perform(*this, entity, initKind, 6617 MultiExprArg(&opaqueValue, 1)); 6618 if (result.isInvalid()) 6619 Invalid = true; 6620 else { 6621 // If the constructor used was non-trivial, set this as the 6622 // "initializer". 6623 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6624 if (!construct->getConstructor()->isTrivial()) { 6625 Expr *init = MaybeCreateExprWithCleanups(construct); 6626 ExDecl->setInit(init); 6627 } 6628 6629 // And make sure it's destructable. 6630 FinalizeVarWithDestructor(ExDecl, recordType); 6631 } 6632 } 6633 } 6634 6635 if (Invalid) 6636 ExDecl->setInvalidDecl(); 6637 6638 return ExDecl; 6639} 6640 6641/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6642/// handler. 6643Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6644 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6645 bool Invalid = D.isInvalidType(); 6646 6647 // Check for unexpanded parameter packs. 6648 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6649 UPPC_ExceptionType)) { 6650 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6651 D.getIdentifierLoc()); 6652 Invalid = true; 6653 } 6654 6655 IdentifierInfo *II = D.getIdentifier(); 6656 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6657 LookupOrdinaryName, 6658 ForRedeclaration)) { 6659 // The scope should be freshly made just for us. There is just no way 6660 // it contains any previous declaration. 6661 assert(!S->isDeclScope(PrevDecl)); 6662 if (PrevDecl->isTemplateParameter()) { 6663 // Maybe we will complain about the shadowed template parameter. 6664 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6665 } 6666 } 6667 6668 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6669 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6670 << D.getCXXScopeSpec().getRange(); 6671 Invalid = true; 6672 } 6673 6674 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6675 D.getIdentifier(), 6676 D.getIdentifierLoc()); 6677 6678 if (Invalid) 6679 ExDecl->setInvalidDecl(); 6680 6681 // Add the exception declaration into this scope. 6682 if (II) 6683 PushOnScopeChains(ExDecl, S); 6684 else 6685 CurContext->addDecl(ExDecl); 6686 6687 ProcessDeclAttributes(S, ExDecl, D); 6688 return ExDecl; 6689} 6690 6691Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6692 Expr *AssertExpr, 6693 Expr *AssertMessageExpr_) { 6694 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6695 6696 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6697 llvm::APSInt Value(32); 6698 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6699 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6700 AssertExpr->getSourceRange(); 6701 return 0; 6702 } 6703 6704 if (Value == 0) { 6705 Diag(AssertLoc, diag::err_static_assert_failed) 6706 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6707 } 6708 } 6709 6710 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6711 return 0; 6712 6713 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6714 AssertExpr, AssertMessage); 6715 6716 CurContext->addDecl(Decl); 6717 return Decl; 6718} 6719 6720/// \brief Perform semantic analysis of the given friend type declaration. 6721/// 6722/// \returns A friend declaration that. 6723FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6724 TypeSourceInfo *TSInfo) { 6725 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6726 6727 QualType T = TSInfo->getType(); 6728 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6729 6730 if (!getLangOptions().CPlusPlus0x) { 6731 // C++03 [class.friend]p2: 6732 // An elaborated-type-specifier shall be used in a friend declaration 6733 // for a class.* 6734 // 6735 // * The class-key of the elaborated-type-specifier is required. 6736 if (!ActiveTemplateInstantiations.empty()) { 6737 // Do not complain about the form of friend template types during 6738 // template instantiation; we will already have complained when the 6739 // template was declared. 6740 } else if (!T->isElaboratedTypeSpecifier()) { 6741 // If we evaluated the type to a record type, suggest putting 6742 // a tag in front. 6743 if (const RecordType *RT = T->getAs<RecordType>()) { 6744 RecordDecl *RD = RT->getDecl(); 6745 6746 std::string InsertionText = std::string(" ") + RD->getKindName(); 6747 6748 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6749 << (unsigned) RD->getTagKind() 6750 << T 6751 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6752 InsertionText); 6753 } else { 6754 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6755 << T 6756 << SourceRange(FriendLoc, TypeRange.getEnd()); 6757 } 6758 } else if (T->getAs<EnumType>()) { 6759 Diag(FriendLoc, diag::ext_enum_friend) 6760 << T 6761 << SourceRange(FriendLoc, TypeRange.getEnd()); 6762 } 6763 } 6764 6765 // C++0x [class.friend]p3: 6766 // If the type specifier in a friend declaration designates a (possibly 6767 // cv-qualified) class type, that class is declared as a friend; otherwise, 6768 // the friend declaration is ignored. 6769 6770 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6771 // in [class.friend]p3 that we do not implement. 6772 6773 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6774} 6775 6776/// Handle a friend tag declaration where the scope specifier was 6777/// templated. 6778Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6779 unsigned TagSpec, SourceLocation TagLoc, 6780 CXXScopeSpec &SS, 6781 IdentifierInfo *Name, SourceLocation NameLoc, 6782 AttributeList *Attr, 6783 MultiTemplateParamsArg TempParamLists) { 6784 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6785 6786 bool isExplicitSpecialization = false; 6787 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6788 bool Invalid = false; 6789 6790 if (TemplateParameterList *TemplateParams 6791 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6792 TempParamLists.get(), 6793 TempParamLists.size(), 6794 /*friend*/ true, 6795 isExplicitSpecialization, 6796 Invalid)) { 6797 --NumMatchedTemplateParamLists; 6798 6799 if (TemplateParams->size() > 0) { 6800 // This is a declaration of a class template. 6801 if (Invalid) 6802 return 0; 6803 6804 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6805 SS, Name, NameLoc, Attr, 6806 TemplateParams, AS_public).take(); 6807 } else { 6808 // The "template<>" header is extraneous. 6809 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6810 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6811 isExplicitSpecialization = true; 6812 } 6813 } 6814 6815 if (Invalid) return 0; 6816 6817 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6818 6819 bool isAllExplicitSpecializations = true; 6820 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6821 if (TempParamLists.get()[I]->size()) { 6822 isAllExplicitSpecializations = false; 6823 break; 6824 } 6825 } 6826 6827 // FIXME: don't ignore attributes. 6828 6829 // If it's explicit specializations all the way down, just forget 6830 // about the template header and build an appropriate non-templated 6831 // friend. TODO: for source fidelity, remember the headers. 6832 if (isAllExplicitSpecializations) { 6833 ElaboratedTypeKeyword Keyword 6834 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6835 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6836 TagLoc, SS.getRange(), NameLoc); 6837 if (T.isNull()) 6838 return 0; 6839 6840 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6841 if (isa<DependentNameType>(T)) { 6842 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6843 TL.setKeywordLoc(TagLoc); 6844 TL.setQualifierRange(SS.getRange()); 6845 TL.setNameLoc(NameLoc); 6846 } else { 6847 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6848 TL.setKeywordLoc(TagLoc); 6849 TL.setQualifierRange(SS.getRange()); 6850 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6851 } 6852 6853 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6854 TSI, FriendLoc); 6855 Friend->setAccess(AS_public); 6856 CurContext->addDecl(Friend); 6857 return Friend; 6858 } 6859 6860 // Handle the case of a templated-scope friend class. e.g. 6861 // template <class T> class A<T>::B; 6862 // FIXME: we don't support these right now. 6863 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6864 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6865 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6866 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6867 TL.setKeywordLoc(TagLoc); 6868 TL.setQualifierRange(SS.getRange()); 6869 TL.setNameLoc(NameLoc); 6870 6871 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6872 TSI, FriendLoc); 6873 Friend->setAccess(AS_public); 6874 Friend->setUnsupportedFriend(true); 6875 CurContext->addDecl(Friend); 6876 return Friend; 6877} 6878 6879 6880/// Handle a friend type declaration. This works in tandem with 6881/// ActOnTag. 6882/// 6883/// Notes on friend class templates: 6884/// 6885/// We generally treat friend class declarations as if they were 6886/// declaring a class. So, for example, the elaborated type specifier 6887/// in a friend declaration is required to obey the restrictions of a 6888/// class-head (i.e. no typedefs in the scope chain), template 6889/// parameters are required to match up with simple template-ids, &c. 6890/// However, unlike when declaring a template specialization, it's 6891/// okay to refer to a template specialization without an empty 6892/// template parameter declaration, e.g. 6893/// friend class A<T>::B<unsigned>; 6894/// We permit this as a special case; if there are any template 6895/// parameters present at all, require proper matching, i.e. 6896/// template <> template <class T> friend class A<int>::B; 6897Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6898 MultiTemplateParamsArg TempParams) { 6899 SourceLocation Loc = DS.getSourceRange().getBegin(); 6900 6901 assert(DS.isFriendSpecified()); 6902 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6903 6904 // Try to convert the decl specifier to a type. This works for 6905 // friend templates because ActOnTag never produces a ClassTemplateDecl 6906 // for a TUK_Friend. 6907 Declarator TheDeclarator(DS, Declarator::MemberContext); 6908 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6909 QualType T = TSI->getType(); 6910 if (TheDeclarator.isInvalidType()) 6911 return 0; 6912 6913 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6914 return 0; 6915 6916 // This is definitely an error in C++98. It's probably meant to 6917 // be forbidden in C++0x, too, but the specification is just 6918 // poorly written. 6919 // 6920 // The problem is with declarations like the following: 6921 // template <T> friend A<T>::foo; 6922 // where deciding whether a class C is a friend or not now hinges 6923 // on whether there exists an instantiation of A that causes 6924 // 'foo' to equal C. There are restrictions on class-heads 6925 // (which we declare (by fiat) elaborated friend declarations to 6926 // be) that makes this tractable. 6927 // 6928 // FIXME: handle "template <> friend class A<T>;", which 6929 // is possibly well-formed? Who even knows? 6930 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6931 Diag(Loc, diag::err_tagless_friend_type_template) 6932 << DS.getSourceRange(); 6933 return 0; 6934 } 6935 6936 // C++98 [class.friend]p1: A friend of a class is a function 6937 // or class that is not a member of the class . . . 6938 // This is fixed in DR77, which just barely didn't make the C++03 6939 // deadline. It's also a very silly restriction that seriously 6940 // affects inner classes and which nobody else seems to implement; 6941 // thus we never diagnose it, not even in -pedantic. 6942 // 6943 // But note that we could warn about it: it's always useless to 6944 // friend one of your own members (it's not, however, worthless to 6945 // friend a member of an arbitrary specialization of your template). 6946 6947 Decl *D; 6948 if (unsigned NumTempParamLists = TempParams.size()) 6949 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6950 NumTempParamLists, 6951 TempParams.release(), 6952 TSI, 6953 DS.getFriendSpecLoc()); 6954 else 6955 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6956 6957 if (!D) 6958 return 0; 6959 6960 D->setAccess(AS_public); 6961 CurContext->addDecl(D); 6962 6963 return D; 6964} 6965 6966Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6967 MultiTemplateParamsArg TemplateParams) { 6968 const DeclSpec &DS = D.getDeclSpec(); 6969 6970 assert(DS.isFriendSpecified()); 6971 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6972 6973 SourceLocation Loc = D.getIdentifierLoc(); 6974 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6975 QualType T = TInfo->getType(); 6976 6977 // C++ [class.friend]p1 6978 // A friend of a class is a function or class.... 6979 // Note that this sees through typedefs, which is intended. 6980 // It *doesn't* see through dependent types, which is correct 6981 // according to [temp.arg.type]p3: 6982 // If a declaration acquires a function type through a 6983 // type dependent on a template-parameter and this causes 6984 // a declaration that does not use the syntactic form of a 6985 // function declarator to have a function type, the program 6986 // is ill-formed. 6987 if (!T->isFunctionType()) { 6988 Diag(Loc, diag::err_unexpected_friend); 6989 6990 // It might be worthwhile to try to recover by creating an 6991 // appropriate declaration. 6992 return 0; 6993 } 6994 6995 // C++ [namespace.memdef]p3 6996 // - If a friend declaration in a non-local class first declares a 6997 // class or function, the friend class or function is a member 6998 // of the innermost enclosing namespace. 6999 // - The name of the friend is not found by simple name lookup 7000 // until a matching declaration is provided in that namespace 7001 // scope (either before or after the class declaration granting 7002 // friendship). 7003 // - If a friend function is called, its name may be found by the 7004 // name lookup that considers functions from namespaces and 7005 // classes associated with the types of the function arguments. 7006 // - When looking for a prior declaration of a class or a function 7007 // declared as a friend, scopes outside the innermost enclosing 7008 // namespace scope are not considered. 7009 7010 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7011 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7012 DeclarationName Name = NameInfo.getName(); 7013 assert(Name); 7014 7015 // Check for unexpanded parameter packs. 7016 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7017 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7018 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7019 return 0; 7020 7021 // The context we found the declaration in, or in which we should 7022 // create the declaration. 7023 DeclContext *DC; 7024 Scope *DCScope = S; 7025 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7026 ForRedeclaration); 7027 7028 // FIXME: there are different rules in local classes 7029 7030 // There are four cases here. 7031 // - There's no scope specifier, in which case we just go to the 7032 // appropriate scope and look for a function or function template 7033 // there as appropriate. 7034 // Recover from invalid scope qualifiers as if they just weren't there. 7035 if (SS.isInvalid() || !SS.isSet()) { 7036 // C++0x [namespace.memdef]p3: 7037 // If the name in a friend declaration is neither qualified nor 7038 // a template-id and the declaration is a function or an 7039 // elaborated-type-specifier, the lookup to determine whether 7040 // the entity has been previously declared shall not consider 7041 // any scopes outside the innermost enclosing namespace. 7042 // C++0x [class.friend]p11: 7043 // If a friend declaration appears in a local class and the name 7044 // specified is an unqualified name, a prior declaration is 7045 // looked up without considering scopes that are outside the 7046 // innermost enclosing non-class scope. For a friend function 7047 // declaration, if there is no prior declaration, the program is 7048 // ill-formed. 7049 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7050 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7051 7052 // Find the appropriate context according to the above. 7053 DC = CurContext; 7054 while (true) { 7055 // Skip class contexts. If someone can cite chapter and verse 7056 // for this behavior, that would be nice --- it's what GCC and 7057 // EDG do, and it seems like a reasonable intent, but the spec 7058 // really only says that checks for unqualified existing 7059 // declarations should stop at the nearest enclosing namespace, 7060 // not that they should only consider the nearest enclosing 7061 // namespace. 7062 while (DC->isRecord()) 7063 DC = DC->getParent(); 7064 7065 LookupQualifiedName(Previous, DC); 7066 7067 // TODO: decide what we think about using declarations. 7068 if (isLocal || !Previous.empty()) 7069 break; 7070 7071 if (isTemplateId) { 7072 if (isa<TranslationUnitDecl>(DC)) break; 7073 } else { 7074 if (DC->isFileContext()) break; 7075 } 7076 DC = DC->getParent(); 7077 } 7078 7079 // C++ [class.friend]p1: A friend of a class is a function or 7080 // class that is not a member of the class . . . 7081 // C++0x changes this for both friend types and functions. 7082 // Most C++ 98 compilers do seem to give an error here, so 7083 // we do, too. 7084 if (!Previous.empty() && DC->Equals(CurContext) 7085 && !getLangOptions().CPlusPlus0x) 7086 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7087 7088 DCScope = getScopeForDeclContext(S, DC); 7089 7090 // - There's a non-dependent scope specifier, in which case we 7091 // compute it and do a previous lookup there for a function 7092 // or function template. 7093 } else if (!SS.getScopeRep()->isDependent()) { 7094 DC = computeDeclContext(SS); 7095 if (!DC) return 0; 7096 7097 if (RequireCompleteDeclContext(SS, DC)) return 0; 7098 7099 LookupQualifiedName(Previous, DC); 7100 7101 // Ignore things found implicitly in the wrong scope. 7102 // TODO: better diagnostics for this case. Suggesting the right 7103 // qualified scope would be nice... 7104 LookupResult::Filter F = Previous.makeFilter(); 7105 while (F.hasNext()) { 7106 NamedDecl *D = F.next(); 7107 if (!DC->InEnclosingNamespaceSetOf( 7108 D->getDeclContext()->getRedeclContext())) 7109 F.erase(); 7110 } 7111 F.done(); 7112 7113 if (Previous.empty()) { 7114 D.setInvalidType(); 7115 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7116 return 0; 7117 } 7118 7119 // C++ [class.friend]p1: A friend of a class is a function or 7120 // class that is not a member of the class . . . 7121 if (DC->Equals(CurContext)) 7122 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7123 7124 // - There's a scope specifier that does not match any template 7125 // parameter lists, in which case we use some arbitrary context, 7126 // create a method or method template, and wait for instantiation. 7127 // - There's a scope specifier that does match some template 7128 // parameter lists, which we don't handle right now. 7129 } else { 7130 DC = CurContext; 7131 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7132 } 7133 7134 if (!DC->isRecord()) { 7135 // This implies that it has to be an operator or function. 7136 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7137 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7138 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7139 Diag(Loc, diag::err_introducing_special_friend) << 7140 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7141 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7142 return 0; 7143 } 7144 } 7145 7146 bool Redeclaration = false; 7147 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7148 move(TemplateParams), 7149 IsDefinition, 7150 Redeclaration); 7151 if (!ND) return 0; 7152 7153 assert(ND->getDeclContext() == DC); 7154 assert(ND->getLexicalDeclContext() == CurContext); 7155 7156 // Add the function declaration to the appropriate lookup tables, 7157 // adjusting the redeclarations list as necessary. We don't 7158 // want to do this yet if the friending class is dependent. 7159 // 7160 // Also update the scope-based lookup if the target context's 7161 // lookup context is in lexical scope. 7162 if (!CurContext->isDependentContext()) { 7163 DC = DC->getRedeclContext(); 7164 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7165 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7166 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7167 } 7168 7169 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7170 D.getIdentifierLoc(), ND, 7171 DS.getFriendSpecLoc()); 7172 FrD->setAccess(AS_public); 7173 CurContext->addDecl(FrD); 7174 7175 if (ND->isInvalidDecl()) 7176 FrD->setInvalidDecl(); 7177 else { 7178 FunctionDecl *FD; 7179 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7180 FD = FTD->getTemplatedDecl(); 7181 else 7182 FD = cast<FunctionDecl>(ND); 7183 7184 // Mark templated-scope function declarations as unsupported. 7185 if (FD->getNumTemplateParameterLists()) 7186 FrD->setUnsupportedFriend(true); 7187 } 7188 7189 return ND; 7190} 7191 7192void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7193 AdjustDeclIfTemplate(Dcl); 7194 7195 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7196 if (!Fn) { 7197 Diag(DelLoc, diag::err_deleted_non_function); 7198 return; 7199 } 7200 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7201 Diag(DelLoc, diag::err_deleted_decl_not_first); 7202 Diag(Prev->getLocation(), diag::note_previous_declaration); 7203 // If the declaration wasn't the first, we delete the function anyway for 7204 // recovery. 7205 } 7206 Fn->setDeleted(); 7207} 7208 7209static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7210 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7211 Stmt *SubStmt = *CI; 7212 if (!SubStmt) 7213 continue; 7214 if (isa<ReturnStmt>(SubStmt)) 7215 Self.Diag(SubStmt->getSourceRange().getBegin(), 7216 diag::err_return_in_constructor_handler); 7217 if (!isa<Expr>(SubStmt)) 7218 SearchForReturnInStmt(Self, SubStmt); 7219 } 7220} 7221 7222void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7223 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7224 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7225 SearchForReturnInStmt(*this, Handler); 7226 } 7227} 7228 7229bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7230 const CXXMethodDecl *Old) { 7231 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7232 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7233 7234 if (Context.hasSameType(NewTy, OldTy) || 7235 NewTy->isDependentType() || OldTy->isDependentType()) 7236 return false; 7237 7238 // Check if the return types are covariant 7239 QualType NewClassTy, OldClassTy; 7240 7241 /// Both types must be pointers or references to classes. 7242 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7243 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7244 NewClassTy = NewPT->getPointeeType(); 7245 OldClassTy = OldPT->getPointeeType(); 7246 } 7247 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7248 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7249 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7250 NewClassTy = NewRT->getPointeeType(); 7251 OldClassTy = OldRT->getPointeeType(); 7252 } 7253 } 7254 } 7255 7256 // The return types aren't either both pointers or references to a class type. 7257 if (NewClassTy.isNull()) { 7258 Diag(New->getLocation(), 7259 diag::err_different_return_type_for_overriding_virtual_function) 7260 << New->getDeclName() << NewTy << OldTy; 7261 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7262 7263 return true; 7264 } 7265 7266 // C++ [class.virtual]p6: 7267 // If the return type of D::f differs from the return type of B::f, the 7268 // class type in the return type of D::f shall be complete at the point of 7269 // declaration of D::f or shall be the class type D. 7270 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7271 if (!RT->isBeingDefined() && 7272 RequireCompleteType(New->getLocation(), NewClassTy, 7273 PDiag(diag::err_covariant_return_incomplete) 7274 << New->getDeclName())) 7275 return true; 7276 } 7277 7278 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7279 // Check if the new class derives from the old class. 7280 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7281 Diag(New->getLocation(), 7282 diag::err_covariant_return_not_derived) 7283 << New->getDeclName() << NewTy << OldTy; 7284 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7285 return true; 7286 } 7287 7288 // Check if we the conversion from derived to base is valid. 7289 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7290 diag::err_covariant_return_inaccessible_base, 7291 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7292 // FIXME: Should this point to the return type? 7293 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7294 // FIXME: this note won't trigger for delayed access control 7295 // diagnostics, and it's impossible to get an undelayed error 7296 // here from access control during the original parse because 7297 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7298 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7299 return true; 7300 } 7301 } 7302 7303 // The qualifiers of the return types must be the same. 7304 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7305 Diag(New->getLocation(), 7306 diag::err_covariant_return_type_different_qualifications) 7307 << New->getDeclName() << NewTy << OldTy; 7308 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7309 return true; 7310 }; 7311 7312 7313 // The new class type must have the same or less qualifiers as the old type. 7314 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7315 Diag(New->getLocation(), 7316 diag::err_covariant_return_type_class_type_more_qualified) 7317 << New->getDeclName() << NewTy << OldTy; 7318 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7319 return true; 7320 }; 7321 7322 return false; 7323} 7324 7325/// \brief Mark the given method pure. 7326/// 7327/// \param Method the method to be marked pure. 7328/// 7329/// \param InitRange the source range that covers the "0" initializer. 7330bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7331 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7332 Method->setPure(); 7333 return false; 7334 } 7335 7336 if (!Method->isInvalidDecl()) 7337 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7338 << Method->getDeclName() << InitRange; 7339 return true; 7340} 7341 7342/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7343/// an initializer for the out-of-line declaration 'Dcl'. The scope 7344/// is a fresh scope pushed for just this purpose. 7345/// 7346/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7347/// static data member of class X, names should be looked up in the scope of 7348/// class X. 7349void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7350 // If there is no declaration, there was an error parsing it. 7351 if (D == 0) return; 7352 7353 // We should only get called for declarations with scope specifiers, like: 7354 // int foo::bar; 7355 assert(D->isOutOfLine()); 7356 EnterDeclaratorContext(S, D->getDeclContext()); 7357} 7358 7359/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7360/// initializer for the out-of-line declaration 'D'. 7361void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7362 // If there is no declaration, there was an error parsing it. 7363 if (D == 0) return; 7364 7365 assert(D->isOutOfLine()); 7366 ExitDeclaratorContext(S); 7367} 7368 7369/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7370/// C++ if/switch/while/for statement. 7371/// e.g: "if (int x = f()) {...}" 7372DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7373 // C++ 6.4p2: 7374 // The declarator shall not specify a function or an array. 7375 // The type-specifier-seq shall not contain typedef and shall not declare a 7376 // new class or enumeration. 7377 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7378 "Parser allowed 'typedef' as storage class of condition decl."); 7379 7380 TagDecl *OwnedTag = 0; 7381 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7382 QualType Ty = TInfo->getType(); 7383 7384 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7385 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7386 // would be created and CXXConditionDeclExpr wants a VarDecl. 7387 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7388 << D.getSourceRange(); 7389 return DeclResult(); 7390 } else if (OwnedTag && OwnedTag->isDefinition()) { 7391 // The type-specifier-seq shall not declare a new class or enumeration. 7392 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7393 } 7394 7395 Decl *Dcl = ActOnDeclarator(S, D); 7396 if (!Dcl) 7397 return DeclResult(); 7398 7399 return Dcl; 7400} 7401 7402void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7403 bool DefinitionRequired) { 7404 // Ignore any vtable uses in unevaluated operands or for classes that do 7405 // not have a vtable. 7406 if (!Class->isDynamicClass() || Class->isDependentContext() || 7407 CurContext->isDependentContext() || 7408 ExprEvalContexts.back().Context == Unevaluated) 7409 return; 7410 7411 // Try to insert this class into the map. 7412 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7413 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7414 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7415 if (!Pos.second) { 7416 // If we already had an entry, check to see if we are promoting this vtable 7417 // to required a definition. If so, we need to reappend to the VTableUses 7418 // list, since we may have already processed the first entry. 7419 if (DefinitionRequired && !Pos.first->second) { 7420 Pos.first->second = true; 7421 } else { 7422 // Otherwise, we can early exit. 7423 return; 7424 } 7425 } 7426 7427 // Local classes need to have their virtual members marked 7428 // immediately. For all other classes, we mark their virtual members 7429 // at the end of the translation unit. 7430 if (Class->isLocalClass()) 7431 MarkVirtualMembersReferenced(Loc, Class); 7432 else 7433 VTableUses.push_back(std::make_pair(Class, Loc)); 7434} 7435 7436bool Sema::DefineUsedVTables() { 7437 if (VTableUses.empty()) 7438 return false; 7439 7440 // Note: The VTableUses vector could grow as a result of marking 7441 // the members of a class as "used", so we check the size each 7442 // time through the loop and prefer indices (with are stable) to 7443 // iterators (which are not). 7444 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7445 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7446 if (!Class) 7447 continue; 7448 7449 SourceLocation Loc = VTableUses[I].second; 7450 7451 // If this class has a key function, but that key function is 7452 // defined in another translation unit, we don't need to emit the 7453 // vtable even though we're using it. 7454 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7455 if (KeyFunction && !KeyFunction->hasBody()) { 7456 switch (KeyFunction->getTemplateSpecializationKind()) { 7457 case TSK_Undeclared: 7458 case TSK_ExplicitSpecialization: 7459 case TSK_ExplicitInstantiationDeclaration: 7460 // The key function is in another translation unit. 7461 continue; 7462 7463 case TSK_ExplicitInstantiationDefinition: 7464 case TSK_ImplicitInstantiation: 7465 // We will be instantiating the key function. 7466 break; 7467 } 7468 } else if (!KeyFunction) { 7469 // If we have a class with no key function that is the subject 7470 // of an explicit instantiation declaration, suppress the 7471 // vtable; it will live with the explicit instantiation 7472 // definition. 7473 bool IsExplicitInstantiationDeclaration 7474 = Class->getTemplateSpecializationKind() 7475 == TSK_ExplicitInstantiationDeclaration; 7476 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7477 REnd = Class->redecls_end(); 7478 R != REnd; ++R) { 7479 TemplateSpecializationKind TSK 7480 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7481 if (TSK == TSK_ExplicitInstantiationDeclaration) 7482 IsExplicitInstantiationDeclaration = true; 7483 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7484 IsExplicitInstantiationDeclaration = false; 7485 break; 7486 } 7487 } 7488 7489 if (IsExplicitInstantiationDeclaration) 7490 continue; 7491 } 7492 7493 // Mark all of the virtual members of this class as referenced, so 7494 // that we can build a vtable. Then, tell the AST consumer that a 7495 // vtable for this class is required. 7496 MarkVirtualMembersReferenced(Loc, Class); 7497 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7498 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7499 7500 // Optionally warn if we're emitting a weak vtable. 7501 if (Class->getLinkage() == ExternalLinkage && 7502 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7503 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7504 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7505 } 7506 } 7507 VTableUses.clear(); 7508 7509 return true; 7510} 7511 7512void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7513 const CXXRecordDecl *RD) { 7514 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7515 e = RD->method_end(); i != e; ++i) { 7516 CXXMethodDecl *MD = *i; 7517 7518 // C++ [basic.def.odr]p2: 7519 // [...] A virtual member function is used if it is not pure. [...] 7520 if (MD->isVirtual() && !MD->isPure()) 7521 MarkDeclarationReferenced(Loc, MD); 7522 } 7523 7524 // Only classes that have virtual bases need a VTT. 7525 if (RD->getNumVBases() == 0) 7526 return; 7527 7528 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7529 e = RD->bases_end(); i != e; ++i) { 7530 const CXXRecordDecl *Base = 7531 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7532 if (Base->getNumVBases() == 0) 7533 continue; 7534 MarkVirtualMembersReferenced(Loc, Base); 7535 } 7536} 7537 7538/// SetIvarInitializers - This routine builds initialization ASTs for the 7539/// Objective-C implementation whose ivars need be initialized. 7540void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7541 if (!getLangOptions().CPlusPlus) 7542 return; 7543 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7544 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7545 CollectIvarsToConstructOrDestruct(OID, ivars); 7546 if (ivars.empty()) 7547 return; 7548 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7549 for (unsigned i = 0; i < ivars.size(); i++) { 7550 FieldDecl *Field = ivars[i]; 7551 if (Field->isInvalidDecl()) 7552 continue; 7553 7554 CXXCtorInitializer *Member; 7555 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7556 InitializationKind InitKind = 7557 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7558 7559 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7560 ExprResult MemberInit = 7561 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7562 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7563 // Note, MemberInit could actually come back empty if no initialization 7564 // is required (e.g., because it would call a trivial default constructor) 7565 if (!MemberInit.get() || MemberInit.isInvalid()) 7566 continue; 7567 7568 Member = 7569 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7570 SourceLocation(), 7571 MemberInit.takeAs<Expr>(), 7572 SourceLocation()); 7573 AllToInit.push_back(Member); 7574 7575 // Be sure that the destructor is accessible and is marked as referenced. 7576 if (const RecordType *RecordTy 7577 = Context.getBaseElementType(Field->getType()) 7578 ->getAs<RecordType>()) { 7579 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7580 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7581 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7582 CheckDestructorAccess(Field->getLocation(), Destructor, 7583 PDiag(diag::err_access_dtor_ivar) 7584 << Context.getBaseElementType(Field->getType())); 7585 } 7586 } 7587 } 7588 ObjCImplementation->setIvarInitializers(Context, 7589 AllToInit.data(), AllToInit.size()); 7590 } 7591} 7592