SemaDeclCXX.cpp revision be38c5f5d8fa7c43c52fafddee054b8fe8c2b964
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++ [class.derived]p2: 525 // If a class is marked with the class-virt-specifier final and it appears 526 // as a base-type-specifier in a base-clause (10 class.derived), the program 527 // is ill-formed. 528 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 529 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 530 << CXXBaseDecl->getDeclName(); 531 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 532 << CXXBaseDecl->getDeclName(); 533 return 0; 534 } 535 536 if (BaseDecl->isInvalidDecl()) 537 Class->setInvalidDecl(); 538 539 // Create the base specifier. 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543} 544 545/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 546/// one entry in the base class list of a class specifier, for 547/// example: 548/// class foo : public bar, virtual private baz { 549/// 'public bar' and 'virtual private baz' are each base-specifiers. 550BaseResult 551Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 552 bool Virtual, AccessSpecifier Access, 553 ParsedType basetype, SourceLocation BaseLoc, 554 SourceLocation EllipsisLoc) { 555 if (!classdecl) 556 return true; 557 558 AdjustDeclIfTemplate(classdecl); 559 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 560 if (!Class) 561 return true; 562 563 TypeSourceInfo *TInfo = 0; 564 GetTypeFromParser(basetype, &TInfo); 565 566 if (EllipsisLoc.isInvalid() && 567 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 568 UPPC_BaseType)) 569 return true; 570 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, TInfo, 573 EllipsisLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 if (!Class->hasObjectMember()) { 600 if (const RecordType *FDTTy = 601 NewBaseType.getTypePtr()->getAs<RecordType>()) 602 if (FDTTy->getDecl()->hasObjectMember()) 603 Class->setHasObjectMember(true); 604 } 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651static CXXRecordDecl *GetClassForType(QualType T) { 652 if (const RecordType *RT = T->getAs<RecordType>()) 653 return cast<CXXRecordDecl>(RT->getDecl()); 654 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 655 return ICT->getDecl(); 656 else 657 return 0; 658} 659 660/// \brief Determine whether the type \p Derived is a C++ class that is 661/// derived from the type \p Base. 662bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 663 if (!getLangOptions().CPlusPlus) 664 return false; 665 666 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 667 if (!DerivedRD) 668 return false; 669 670 CXXRecordDecl *BaseRD = GetClassForType(Base); 671 if (!BaseRD) 672 return false; 673 674 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 675 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 return DerivedRD->isDerivedFrom(BaseRD, Paths); 693} 694 695void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 696 CXXCastPath &BasePathArray) { 697 assert(BasePathArray.empty() && "Base path array must be empty!"); 698 assert(Paths.isRecordingPaths() && "Must record paths!"); 699 700 const CXXBasePath &Path = Paths.front(); 701 702 // We first go backward and check if we have a virtual base. 703 // FIXME: It would be better if CXXBasePath had the base specifier for 704 // the nearest virtual base. 705 unsigned Start = 0; 706 for (unsigned I = Path.size(); I != 0; --I) { 707 if (Path[I - 1].Base->isVirtual()) { 708 Start = I - 1; 709 break; 710 } 711 } 712 713 // Now add all bases. 714 for (unsigned I = Start, E = Path.size(); I != E; ++I) 715 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 716} 717 718/// \brief Determine whether the given base path includes a virtual 719/// base class. 720bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 721 for (CXXCastPath::const_iterator B = BasePath.begin(), 722 BEnd = BasePath.end(); 723 B != BEnd; ++B) 724 if ((*B)->isVirtual()) 725 return true; 726 727 return false; 728} 729 730/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 731/// conversion (where Derived and Base are class types) is 732/// well-formed, meaning that the conversion is unambiguous (and 733/// that all of the base classes are accessible). Returns true 734/// and emits a diagnostic if the code is ill-formed, returns false 735/// otherwise. Loc is the location where this routine should point to 736/// if there is an error, and Range is the source range to highlight 737/// if there is an error. 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 unsigned InaccessibleBaseID, 741 unsigned AmbigiousBaseConvID, 742 SourceLocation Loc, SourceRange Range, 743 DeclarationName Name, 744 CXXCastPath *BasePath) { 745 // First, determine whether the path from Derived to Base is 746 // ambiguous. This is slightly more expensive than checking whether 747 // the Derived to Base conversion exists, because here we need to 748 // explore multiple paths to determine if there is an ambiguity. 749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 750 /*DetectVirtual=*/false); 751 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 752 assert(DerivationOkay && 753 "Can only be used with a derived-to-base conversion"); 754 (void)DerivationOkay; 755 756 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 757 if (InaccessibleBaseID) { 758 // Check that the base class can be accessed. 759 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 760 InaccessibleBaseID)) { 761 case AR_inaccessible: 762 return true; 763 case AR_accessible: 764 case AR_dependent: 765 case AR_delayed: 766 break; 767 } 768 } 769 770 // Build a base path if necessary. 771 if (BasePath) 772 BuildBasePathArray(Paths, *BasePath); 773 return false; 774 } 775 776 // We know that the derived-to-base conversion is ambiguous, and 777 // we're going to produce a diagnostic. Perform the derived-to-base 778 // search just one more time to compute all of the possible paths so 779 // that we can print them out. This is more expensive than any of 780 // the previous derived-to-base checks we've done, but at this point 781 // performance isn't as much of an issue. 782 Paths.clear(); 783 Paths.setRecordingPaths(true); 784 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 785 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 786 (void)StillOkay; 787 788 // Build up a textual representation of the ambiguous paths, e.g., 789 // D -> B -> A, that will be used to illustrate the ambiguous 790 // conversions in the diagnostic. We only print one of the paths 791 // to each base class subobject. 792 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 793 794 Diag(Loc, AmbigiousBaseConvID) 795 << Derived << Base << PathDisplayStr << Range << Name; 796 return true; 797} 798 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 SourceLocation Loc, SourceRange Range, 802 CXXCastPath *BasePath, 803 bool IgnoreAccess) { 804 return CheckDerivedToBaseConversion(Derived, Base, 805 IgnoreAccess ? 0 806 : diag::err_upcast_to_inaccessible_base, 807 diag::err_ambiguous_derived_to_base_conv, 808 Loc, Range, DeclarationName(), 809 BasePath); 810} 811 812 813/// @brief Builds a string representing ambiguous paths from a 814/// specific derived class to different subobjects of the same base 815/// class. 816/// 817/// This function builds a string that can be used in error messages 818/// to show the different paths that one can take through the 819/// inheritance hierarchy to go from the derived class to different 820/// subobjects of a base class. The result looks something like this: 821/// @code 822/// struct D -> struct B -> struct A 823/// struct D -> struct C -> struct A 824/// @endcode 825std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 826 std::string PathDisplayStr; 827 std::set<unsigned> DisplayedPaths; 828 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 829 Path != Paths.end(); ++Path) { 830 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 831 // We haven't displayed a path to this particular base 832 // class subobject yet. 833 PathDisplayStr += "\n "; 834 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 835 for (CXXBasePath::const_iterator Element = Path->begin(); 836 Element != Path->end(); ++Element) 837 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 838 } 839 } 840 841 return PathDisplayStr; 842} 843 844//===----------------------------------------------------------------------===// 845// C++ class member Handling 846//===----------------------------------------------------------------------===// 847 848/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 849Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 850 SourceLocation ASLoc, 851 SourceLocation ColonLoc) { 852 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 853 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 854 ASLoc, ColonLoc); 855 CurContext->addHiddenDecl(ASDecl); 856 return ASDecl; 857} 858 859/// CheckOverrideControl - Check C++0x override control semantics. 860void Sema::CheckOverrideControl(const Decl *D) { 861 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 862 if (!MD || !MD->isVirtual()) 863 return; 864 865 if (MD->isDependentContext()) 866 return; 867 868 // C++0x [class.virtual]p3: 869 // If a virtual function is marked with the virt-specifier override and does 870 // not override a member function of a base class, 871 // the program is ill-formed. 872 bool HasOverriddenMethods = 873 MD->begin_overridden_methods() != MD->end_overridden_methods(); 874 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 875 Diag(MD->getLocation(), 876 diag::err_function_marked_override_not_overriding) 877 << MD->getDeclName(); 878 return; 879 } 880 881 // C++0x [class.derived]p8: 882 // In a class definition marked with the class-virt-specifier explicit, 883 // if a virtual member function that is neither implicitly-declared nor a 884 // destructor overrides a member function of a base class and it is not 885 // marked with the virt-specifier override, the program is ill-formed. 886 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 887 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 888 llvm::SmallVector<const CXXMethodDecl*, 4> 889 OverriddenMethods(MD->begin_overridden_methods(), 890 MD->end_overridden_methods()); 891 892 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 893 << MD->getDeclName() 894 << (unsigned)OverriddenMethods.size(); 895 896 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 897 Diag(OverriddenMethods[I]->getLocation(), 898 diag::note_overridden_virtual_function); 899 } 900} 901 902/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 903/// function overrides a virtual member function marked 'final', according to 904/// C++0x [class.virtual]p3. 905bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 906 const CXXMethodDecl *Old) { 907 if (!Old->hasAttr<FinalAttr>()) 908 return false; 909 910 Diag(New->getLocation(), diag::err_final_function_overridden) 911 << New->getDeclName(); 912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 913 return true; 914} 915 916/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 917/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 918/// bitfield width if there is one and 'InitExpr' specifies the initializer if 919/// any. 920Decl * 921Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 922 MultiTemplateParamsArg TemplateParameterLists, 923 ExprTy *BW, const VirtSpecifiers &VS, 924 ExprTy *InitExpr, bool IsDefinition, 925 bool Deleted) { 926 const DeclSpec &DS = D.getDeclSpec(); 927 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 928 DeclarationName Name = NameInfo.getName(); 929 SourceLocation Loc = NameInfo.getLoc(); 930 931 // For anonymous bitfields, the location should point to the type. 932 if (Loc.isInvalid()) 933 Loc = D.getSourceRange().getBegin(); 934 935 Expr *BitWidth = static_cast<Expr*>(BW); 936 Expr *Init = static_cast<Expr*>(InitExpr); 937 938 assert(isa<CXXRecordDecl>(CurContext)); 939 assert(!DS.isFriendSpecified()); 940 941 bool isFunc = false; 942 if (D.isFunctionDeclarator()) 943 isFunc = true; 944 else if (D.getNumTypeObjects() == 0 && 945 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 946 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 947 isFunc = TDType->isFunctionType(); 948 } 949 950 // C++ 9.2p6: A member shall not be declared to have automatic storage 951 // duration (auto, register) or with the extern storage-class-specifier. 952 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 953 // data members and cannot be applied to names declared const or static, 954 // and cannot be applied to reference members. 955 switch (DS.getStorageClassSpec()) { 956 case DeclSpec::SCS_unspecified: 957 case DeclSpec::SCS_typedef: 958 case DeclSpec::SCS_static: 959 // FALL THROUGH. 960 break; 961 case DeclSpec::SCS_mutable: 962 if (isFunc) { 963 if (DS.getStorageClassSpecLoc().isValid()) 964 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 965 else 966 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 967 968 // FIXME: It would be nicer if the keyword was ignored only for this 969 // declarator. Otherwise we could get follow-up errors. 970 D.getMutableDeclSpec().ClearStorageClassSpecs(); 971 } 972 break; 973 default: 974 if (DS.getStorageClassSpecLoc().isValid()) 975 Diag(DS.getStorageClassSpecLoc(), 976 diag::err_storageclass_invalid_for_member); 977 else 978 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 979 D.getMutableDeclSpec().ClearStorageClassSpecs(); 980 } 981 982 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 983 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 984 !isFunc); 985 986 Decl *Member; 987 if (isInstField) { 988 CXXScopeSpec &SS = D.getCXXScopeSpec(); 989 990 991 if (SS.isSet() && !SS.isInvalid()) { 992 // The user provided a superfluous scope specifier inside a class 993 // definition: 994 // 995 // class X { 996 // int X::member; 997 // }; 998 DeclContext *DC = 0; 999 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1000 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1001 << Name << FixItHint::CreateRemoval(SS.getRange()); 1002 else 1003 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1004 << Name << SS.getRange(); 1005 1006 SS.clear(); 1007 } 1008 1009 // FIXME: Check for template parameters! 1010 // FIXME: Check that the name is an identifier! 1011 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1012 AS); 1013 assert(Member && "HandleField never returns null"); 1014 } else { 1015 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1016 if (!Member) { 1017 return 0; 1018 } 1019 1020 // Non-instance-fields can't have a bitfield. 1021 if (BitWidth) { 1022 if (Member->isInvalidDecl()) { 1023 // don't emit another diagnostic. 1024 } else if (isa<VarDecl>(Member)) { 1025 // C++ 9.6p3: A bit-field shall not be a static member. 1026 // "static member 'A' cannot be a bit-field" 1027 Diag(Loc, diag::err_static_not_bitfield) 1028 << Name << BitWidth->getSourceRange(); 1029 } else if (isa<TypedefDecl>(Member)) { 1030 // "typedef member 'x' cannot be a bit-field" 1031 Diag(Loc, diag::err_typedef_not_bitfield) 1032 << Name << BitWidth->getSourceRange(); 1033 } else { 1034 // A function typedef ("typedef int f(); f a;"). 1035 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1036 Diag(Loc, diag::err_not_integral_type_bitfield) 1037 << Name << cast<ValueDecl>(Member)->getType() 1038 << BitWidth->getSourceRange(); 1039 } 1040 1041 BitWidth = 0; 1042 Member->setInvalidDecl(); 1043 } 1044 1045 Member->setAccess(AS); 1046 1047 // If we have declared a member function template, set the access of the 1048 // templated declaration as well. 1049 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1050 FunTmpl->getTemplatedDecl()->setAccess(AS); 1051 } 1052 1053 if (VS.isOverrideSpecified()) { 1054 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1055 if (!MD || !MD->isVirtual()) { 1056 Diag(Member->getLocStart(), 1057 diag::override_keyword_only_allowed_on_virtual_member_functions) 1058 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1059 } else 1060 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1061 } 1062 if (VS.isFinalSpecified()) { 1063 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1064 if (!MD || !MD->isVirtual()) { 1065 Diag(Member->getLocStart(), 1066 diag::override_keyword_only_allowed_on_virtual_member_functions) 1067 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1068 } else 1069 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1070 } 1071 1072 CheckOverrideControl(Member); 1073 1074 assert((Name || isInstField) && "No identifier for non-field ?"); 1075 1076 if (Init) 1077 AddInitializerToDecl(Member, Init, false, 1078 DS.getTypeSpecType() == DeclSpec::TST_auto); 1079 if (Deleted) // FIXME: Source location is not very good. 1080 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1081 1082 FinalizeDeclaration(Member); 1083 1084 if (isInstField) 1085 FieldCollector->Add(cast<FieldDecl>(Member)); 1086 return Member; 1087} 1088 1089/// \brief Find the direct and/or virtual base specifiers that 1090/// correspond to the given base type, for use in base initialization 1091/// within a constructor. 1092static bool FindBaseInitializer(Sema &SemaRef, 1093 CXXRecordDecl *ClassDecl, 1094 QualType BaseType, 1095 const CXXBaseSpecifier *&DirectBaseSpec, 1096 const CXXBaseSpecifier *&VirtualBaseSpec) { 1097 // First, check for a direct base class. 1098 DirectBaseSpec = 0; 1099 for (CXXRecordDecl::base_class_const_iterator Base 1100 = ClassDecl->bases_begin(); 1101 Base != ClassDecl->bases_end(); ++Base) { 1102 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1103 // We found a direct base of this type. That's what we're 1104 // initializing. 1105 DirectBaseSpec = &*Base; 1106 break; 1107 } 1108 } 1109 1110 // Check for a virtual base class. 1111 // FIXME: We might be able to short-circuit this if we know in advance that 1112 // there are no virtual bases. 1113 VirtualBaseSpec = 0; 1114 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1115 // We haven't found a base yet; search the class hierarchy for a 1116 // virtual base class. 1117 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1118 /*DetectVirtual=*/false); 1119 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1120 BaseType, Paths)) { 1121 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1122 Path != Paths.end(); ++Path) { 1123 if (Path->back().Base->isVirtual()) { 1124 VirtualBaseSpec = Path->back().Base; 1125 break; 1126 } 1127 } 1128 } 1129 } 1130 1131 return DirectBaseSpec || VirtualBaseSpec; 1132} 1133 1134/// ActOnMemInitializer - Handle a C++ member initializer. 1135MemInitResult 1136Sema::ActOnMemInitializer(Decl *ConstructorD, 1137 Scope *S, 1138 CXXScopeSpec &SS, 1139 IdentifierInfo *MemberOrBase, 1140 ParsedType TemplateTypeTy, 1141 SourceLocation IdLoc, 1142 SourceLocation LParenLoc, 1143 ExprTy **Args, unsigned NumArgs, 1144 SourceLocation RParenLoc, 1145 SourceLocation EllipsisLoc) { 1146 if (!ConstructorD) 1147 return true; 1148 1149 AdjustDeclIfTemplate(ConstructorD); 1150 1151 CXXConstructorDecl *Constructor 1152 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1153 if (!Constructor) { 1154 // The user wrote a constructor initializer on a function that is 1155 // not a C++ constructor. Ignore the error for now, because we may 1156 // have more member initializers coming; we'll diagnose it just 1157 // once in ActOnMemInitializers. 1158 return true; 1159 } 1160 1161 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1162 1163 // C++ [class.base.init]p2: 1164 // Names in a mem-initializer-id are looked up in the scope of the 1165 // constructor's class and, if not found in that scope, are looked 1166 // up in the scope containing the constructor's definition. 1167 // [Note: if the constructor's class contains a member with the 1168 // same name as a direct or virtual base class of the class, a 1169 // mem-initializer-id naming the member or base class and composed 1170 // of a single identifier refers to the class member. A 1171 // mem-initializer-id for the hidden base class may be specified 1172 // using a qualified name. ] 1173 if (!SS.getScopeRep() && !TemplateTypeTy) { 1174 // Look for a member, first. 1175 FieldDecl *Member = 0; 1176 DeclContext::lookup_result Result 1177 = ClassDecl->lookup(MemberOrBase); 1178 if (Result.first != Result.second) { 1179 Member = dyn_cast<FieldDecl>(*Result.first); 1180 1181 if (Member) { 1182 if (EllipsisLoc.isValid()) 1183 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1184 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1185 1186 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1187 LParenLoc, RParenLoc); 1188 } 1189 1190 // Handle anonymous union case. 1191 if (IndirectFieldDecl* IndirectField 1192 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1193 if (EllipsisLoc.isValid()) 1194 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 1197 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1198 NumArgs, IdLoc, 1199 LParenLoc, RParenLoc); 1200 } 1201 } 1202 } 1203 // It didn't name a member, so see if it names a class. 1204 QualType BaseType; 1205 TypeSourceInfo *TInfo = 0; 1206 1207 if (TemplateTypeTy) { 1208 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1209 } else { 1210 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1211 LookupParsedName(R, S, &SS); 1212 1213 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1214 if (!TyD) { 1215 if (R.isAmbiguous()) return true; 1216 1217 // We don't want access-control diagnostics here. 1218 R.suppressDiagnostics(); 1219 1220 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1221 bool NotUnknownSpecialization = false; 1222 DeclContext *DC = computeDeclContext(SS, false); 1223 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1224 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1225 1226 if (!NotUnknownSpecialization) { 1227 // When the scope specifier can refer to a member of an unknown 1228 // specialization, we take it as a type name. 1229 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1230 SS.getWithLocInContext(Context), 1231 *MemberOrBase, IdLoc); 1232 if (BaseType.isNull()) 1233 return true; 1234 1235 R.clear(); 1236 R.setLookupName(MemberOrBase); 1237 } 1238 } 1239 1240 // If no results were found, try to correct typos. 1241 if (R.empty() && BaseType.isNull() && 1242 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1243 R.isSingleResult()) { 1244 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1245 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1246 // We have found a non-static data member with a similar 1247 // name to what was typed; complain and initialize that 1248 // member. 1249 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1250 << MemberOrBase << true << R.getLookupName() 1251 << FixItHint::CreateReplacement(R.getNameLoc(), 1252 R.getLookupName().getAsString()); 1253 Diag(Member->getLocation(), diag::note_previous_decl) 1254 << Member->getDeclName(); 1255 1256 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1257 LParenLoc, RParenLoc); 1258 } 1259 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1260 const CXXBaseSpecifier *DirectBaseSpec; 1261 const CXXBaseSpecifier *VirtualBaseSpec; 1262 if (FindBaseInitializer(*this, ClassDecl, 1263 Context.getTypeDeclType(Type), 1264 DirectBaseSpec, VirtualBaseSpec)) { 1265 // We have found a direct or virtual base class with a 1266 // similar name to what was typed; complain and initialize 1267 // that base class. 1268 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1269 << MemberOrBase << false << R.getLookupName() 1270 << FixItHint::CreateReplacement(R.getNameLoc(), 1271 R.getLookupName().getAsString()); 1272 1273 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1274 : VirtualBaseSpec; 1275 Diag(BaseSpec->getSourceRange().getBegin(), 1276 diag::note_base_class_specified_here) 1277 << BaseSpec->getType() 1278 << BaseSpec->getSourceRange(); 1279 1280 TyD = Type; 1281 } 1282 } 1283 } 1284 1285 if (!TyD && BaseType.isNull()) { 1286 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1287 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1288 return true; 1289 } 1290 } 1291 1292 if (BaseType.isNull()) { 1293 BaseType = Context.getTypeDeclType(TyD); 1294 if (SS.isSet()) { 1295 NestedNameSpecifier *Qualifier = 1296 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1297 1298 // FIXME: preserve source range information 1299 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1300 } 1301 } 1302 } 1303 1304 if (!TInfo) 1305 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1306 1307 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1308 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1309} 1310 1311/// Checks an initializer expression for use of uninitialized fields, such as 1312/// containing the field that is being initialized. Returns true if there is an 1313/// uninitialized field was used an updates the SourceLocation parameter; false 1314/// otherwise. 1315static bool InitExprContainsUninitializedFields(const Stmt *S, 1316 const ValueDecl *LhsField, 1317 SourceLocation *L) { 1318 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1319 1320 if (isa<CallExpr>(S)) { 1321 // Do not descend into function calls or constructors, as the use 1322 // of an uninitialized field may be valid. One would have to inspect 1323 // the contents of the function/ctor to determine if it is safe or not. 1324 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1325 // may be safe, depending on what the function/ctor does. 1326 return false; 1327 } 1328 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1329 const NamedDecl *RhsField = ME->getMemberDecl(); 1330 1331 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1332 // The member expression points to a static data member. 1333 assert(VD->isStaticDataMember() && 1334 "Member points to non-static data member!"); 1335 (void)VD; 1336 return false; 1337 } 1338 1339 if (isa<EnumConstantDecl>(RhsField)) { 1340 // The member expression points to an enum. 1341 return false; 1342 } 1343 1344 if (RhsField == LhsField) { 1345 // Initializing a field with itself. Throw a warning. 1346 // But wait; there are exceptions! 1347 // Exception #1: The field may not belong to this record. 1348 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1349 const Expr *base = ME->getBase(); 1350 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1351 // Even though the field matches, it does not belong to this record. 1352 return false; 1353 } 1354 // None of the exceptions triggered; return true to indicate an 1355 // uninitialized field was used. 1356 *L = ME->getMemberLoc(); 1357 return true; 1358 } 1359 } else if (isa<SizeOfAlignOfExpr>(S)) { 1360 // sizeof/alignof doesn't reference contents, do not warn. 1361 return false; 1362 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1363 // address-of doesn't reference contents (the pointer may be dereferenced 1364 // in the same expression but it would be rare; and weird). 1365 if (UOE->getOpcode() == UO_AddrOf) 1366 return false; 1367 } 1368 for (Stmt::const_child_range it = S->children(); it; ++it) { 1369 if (!*it) { 1370 // An expression such as 'member(arg ?: "")' may trigger this. 1371 continue; 1372 } 1373 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1374 return true; 1375 } 1376 return false; 1377} 1378 1379MemInitResult 1380Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1381 unsigned NumArgs, SourceLocation IdLoc, 1382 SourceLocation LParenLoc, 1383 SourceLocation RParenLoc) { 1384 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1385 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1386 assert((DirectMember || IndirectMember) && 1387 "Member must be a FieldDecl or IndirectFieldDecl"); 1388 1389 if (Member->isInvalidDecl()) 1390 return true; 1391 1392 // Diagnose value-uses of fields to initialize themselves, e.g. 1393 // foo(foo) 1394 // where foo is not also a parameter to the constructor. 1395 // TODO: implement -Wuninitialized and fold this into that framework. 1396 for (unsigned i = 0; i < NumArgs; ++i) { 1397 SourceLocation L; 1398 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1399 // FIXME: Return true in the case when other fields are used before being 1400 // uninitialized. For example, let this field be the i'th field. When 1401 // initializing the i'th field, throw a warning if any of the >= i'th 1402 // fields are used, as they are not yet initialized. 1403 // Right now we are only handling the case where the i'th field uses 1404 // itself in its initializer. 1405 Diag(L, diag::warn_field_is_uninit); 1406 } 1407 } 1408 1409 bool HasDependentArg = false; 1410 for (unsigned i = 0; i < NumArgs; i++) 1411 HasDependentArg |= Args[i]->isTypeDependent(); 1412 1413 Expr *Init; 1414 if (Member->getType()->isDependentType() || HasDependentArg) { 1415 // Can't check initialization for a member of dependent type or when 1416 // any of the arguments are type-dependent expressions. 1417 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc); 1419 1420 // Erase any temporaries within this evaluation context; we're not 1421 // going to track them in the AST, since we'll be rebuilding the 1422 // ASTs during template instantiation. 1423 ExprTemporaries.erase( 1424 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1425 ExprTemporaries.end()); 1426 } else { 1427 // Initialize the member. 1428 InitializedEntity MemberEntity = 1429 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1430 : InitializedEntity::InitializeMember(IndirectMember, 0); 1431 InitializationKind Kind = 1432 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1433 1434 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1435 1436 ExprResult MemberInit = 1437 InitSeq.Perform(*this, MemberEntity, Kind, 1438 MultiExprArg(*this, Args, NumArgs), 0); 1439 if (MemberInit.isInvalid()) 1440 return true; 1441 1442 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1443 1444 // C++0x [class.base.init]p7: 1445 // The initialization of each base and member constitutes a 1446 // full-expression. 1447 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1448 if (MemberInit.isInvalid()) 1449 return true; 1450 1451 // If we are in a dependent context, template instantiation will 1452 // perform this type-checking again. Just save the arguments that we 1453 // received in a ParenListExpr. 1454 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1455 // of the information that we have about the member 1456 // initializer. However, deconstructing the ASTs is a dicey process, 1457 // and this approach is far more likely to get the corner cases right. 1458 if (CurContext->isDependentContext()) 1459 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1460 RParenLoc); 1461 else 1462 Init = MemberInit.get(); 1463 } 1464 1465 if (DirectMember) { 1466 return new (Context) CXXCtorInitializer(Context, DirectMember, 1467 IdLoc, LParenLoc, Init, 1468 RParenLoc); 1469 } else { 1470 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1471 IdLoc, LParenLoc, Init, 1472 RParenLoc); 1473 } 1474} 1475 1476MemInitResult 1477Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1478 Expr **Args, unsigned NumArgs, 1479 SourceLocation NameLoc, 1480 SourceLocation LParenLoc, 1481 SourceLocation RParenLoc, 1482 CXXRecordDecl *ClassDecl) { 1483 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1484 if (!LangOpts.CPlusPlus0x) 1485 return Diag(Loc, diag::err_delegation_0x_only) 1486 << TInfo->getTypeLoc().getLocalSourceRange(); 1487 1488 // Initialize the object. 1489 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1490 QualType(ClassDecl->getTypeForDecl(), 0)); 1491 InitializationKind Kind = 1492 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1493 1494 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1495 1496 ExprResult DelegationInit = 1497 InitSeq.Perform(*this, DelegationEntity, Kind, 1498 MultiExprArg(*this, Args, NumArgs), 0); 1499 if (DelegationInit.isInvalid()) 1500 return true; 1501 1502 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1503 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1504 assert(Constructor && "Delegating constructor with no target?"); 1505 1506 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1507 1508 // C++0x [class.base.init]p7: 1509 // The initialization of each base and member constitutes a 1510 // full-expression. 1511 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1512 if (DelegationInit.isInvalid()) 1513 return true; 1514 1515 // If we are in a dependent context, template instantiation will 1516 // perform this type-checking again. Just save the arguments that we 1517 // received in a ParenListExpr. 1518 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1519 // of the information that we have about the base 1520 // initializer. However, deconstructing the ASTs is a dicey process, 1521 // and this approach is far more likely to get the corner cases right. 1522 if (CurContext->isDependentContext()) { 1523 ExprResult Init 1524 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1525 NumArgs, RParenLoc)); 1526 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1527 Constructor, Init.takeAs<Expr>(), 1528 RParenLoc); 1529 } 1530 1531 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1532 DelegationInit.takeAs<Expr>(), 1533 RParenLoc); 1534} 1535 1536MemInitResult 1537Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1538 Expr **Args, unsigned NumArgs, 1539 SourceLocation LParenLoc, SourceLocation RParenLoc, 1540 CXXRecordDecl *ClassDecl, 1541 SourceLocation EllipsisLoc) { 1542 bool HasDependentArg = false; 1543 for (unsigned i = 0; i < NumArgs; i++) 1544 HasDependentArg |= Args[i]->isTypeDependent(); 1545 1546 SourceLocation BaseLoc 1547 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1548 1549 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1550 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1551 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1552 1553 // C++ [class.base.init]p2: 1554 // [...] Unless the mem-initializer-id names a nonstatic data 1555 // member of the constructor's class or a direct or virtual base 1556 // of that class, the mem-initializer is ill-formed. A 1557 // mem-initializer-list can initialize a base class using any 1558 // name that denotes that base class type. 1559 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1560 1561 if (EllipsisLoc.isValid()) { 1562 // This is a pack expansion. 1563 if (!BaseType->containsUnexpandedParameterPack()) { 1564 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1565 << SourceRange(BaseLoc, RParenLoc); 1566 1567 EllipsisLoc = SourceLocation(); 1568 } 1569 } else { 1570 // Check for any unexpanded parameter packs. 1571 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1572 return true; 1573 1574 for (unsigned I = 0; I != NumArgs; ++I) 1575 if (DiagnoseUnexpandedParameterPack(Args[I])) 1576 return true; 1577 } 1578 1579 // Check for direct and virtual base classes. 1580 const CXXBaseSpecifier *DirectBaseSpec = 0; 1581 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1582 if (!Dependent) { 1583 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1584 BaseType)) 1585 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1586 LParenLoc, RParenLoc, ClassDecl); 1587 1588 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1589 VirtualBaseSpec); 1590 1591 // C++ [base.class.init]p2: 1592 // Unless the mem-initializer-id names a nonstatic data member of the 1593 // constructor's class or a direct or virtual base of that class, the 1594 // mem-initializer is ill-formed. 1595 if (!DirectBaseSpec && !VirtualBaseSpec) { 1596 // If the class has any dependent bases, then it's possible that 1597 // one of those types will resolve to the same type as 1598 // BaseType. Therefore, just treat this as a dependent base 1599 // class initialization. FIXME: Should we try to check the 1600 // initialization anyway? It seems odd. 1601 if (ClassDecl->hasAnyDependentBases()) 1602 Dependent = true; 1603 else 1604 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1605 << BaseType << Context.getTypeDeclType(ClassDecl) 1606 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1607 } 1608 } 1609 1610 if (Dependent) { 1611 // Can't check initialization for a base of dependent type or when 1612 // any of the arguments are type-dependent expressions. 1613 ExprResult BaseInit 1614 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1615 RParenLoc)); 1616 1617 // Erase any temporaries within this evaluation context; we're not 1618 // going to track them in the AST, since we'll be rebuilding the 1619 // ASTs during template instantiation. 1620 ExprTemporaries.erase( 1621 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1622 ExprTemporaries.end()); 1623 1624 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1625 /*IsVirtual=*/false, 1626 LParenLoc, 1627 BaseInit.takeAs<Expr>(), 1628 RParenLoc, 1629 EllipsisLoc); 1630 } 1631 1632 // C++ [base.class.init]p2: 1633 // If a mem-initializer-id is ambiguous because it designates both 1634 // a direct non-virtual base class and an inherited virtual base 1635 // class, the mem-initializer is ill-formed. 1636 if (DirectBaseSpec && VirtualBaseSpec) 1637 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1638 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1639 1640 CXXBaseSpecifier *BaseSpec 1641 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1642 if (!BaseSpec) 1643 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1644 1645 // Initialize the base. 1646 InitializedEntity BaseEntity = 1647 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1648 InitializationKind Kind = 1649 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1650 1651 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1652 1653 ExprResult BaseInit = 1654 InitSeq.Perform(*this, BaseEntity, Kind, 1655 MultiExprArg(*this, Args, NumArgs), 0); 1656 if (BaseInit.isInvalid()) 1657 return true; 1658 1659 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1660 1661 // C++0x [class.base.init]p7: 1662 // The initialization of each base and member constitutes a 1663 // full-expression. 1664 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1665 if (BaseInit.isInvalid()) 1666 return true; 1667 1668 // If we are in a dependent context, template instantiation will 1669 // perform this type-checking again. Just save the arguments that we 1670 // received in a ParenListExpr. 1671 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1672 // of the information that we have about the base 1673 // initializer. However, deconstructing the ASTs is a dicey process, 1674 // and this approach is far more likely to get the corner cases right. 1675 if (CurContext->isDependentContext()) { 1676 ExprResult Init 1677 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1678 RParenLoc)); 1679 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1680 BaseSpec->isVirtual(), 1681 LParenLoc, 1682 Init.takeAs<Expr>(), 1683 RParenLoc, 1684 EllipsisLoc); 1685 } 1686 1687 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1688 BaseSpec->isVirtual(), 1689 LParenLoc, 1690 BaseInit.takeAs<Expr>(), 1691 RParenLoc, 1692 EllipsisLoc); 1693} 1694 1695/// ImplicitInitializerKind - How an implicit base or member initializer should 1696/// initialize its base or member. 1697enum ImplicitInitializerKind { 1698 IIK_Default, 1699 IIK_Copy, 1700 IIK_Move 1701}; 1702 1703static bool 1704BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1705 ImplicitInitializerKind ImplicitInitKind, 1706 CXXBaseSpecifier *BaseSpec, 1707 bool IsInheritedVirtualBase, 1708 CXXCtorInitializer *&CXXBaseInit) { 1709 InitializedEntity InitEntity 1710 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1711 IsInheritedVirtualBase); 1712 1713 ExprResult BaseInit; 1714 1715 switch (ImplicitInitKind) { 1716 case IIK_Default: { 1717 InitializationKind InitKind 1718 = InitializationKind::CreateDefault(Constructor->getLocation()); 1719 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1720 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1721 MultiExprArg(SemaRef, 0, 0)); 1722 break; 1723 } 1724 1725 case IIK_Copy: { 1726 ParmVarDecl *Param = Constructor->getParamDecl(0); 1727 QualType ParamType = Param->getType().getNonReferenceType(); 1728 1729 Expr *CopyCtorArg = 1730 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1731 Constructor->getLocation(), ParamType, 1732 VK_LValue, 0); 1733 1734 // Cast to the base class to avoid ambiguities. 1735 QualType ArgTy = 1736 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1737 ParamType.getQualifiers()); 1738 1739 CXXCastPath BasePath; 1740 BasePath.push_back(BaseSpec); 1741 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1742 CK_UncheckedDerivedToBase, 1743 VK_LValue, &BasePath); 1744 1745 InitializationKind InitKind 1746 = InitializationKind::CreateDirect(Constructor->getLocation(), 1747 SourceLocation(), SourceLocation()); 1748 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1749 &CopyCtorArg, 1); 1750 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1751 MultiExprArg(&CopyCtorArg, 1)); 1752 break; 1753 } 1754 1755 case IIK_Move: 1756 assert(false && "Unhandled initializer kind!"); 1757 } 1758 1759 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1760 if (BaseInit.isInvalid()) 1761 return true; 1762 1763 CXXBaseInit = 1764 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1765 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1766 SourceLocation()), 1767 BaseSpec->isVirtual(), 1768 SourceLocation(), 1769 BaseInit.takeAs<Expr>(), 1770 SourceLocation(), 1771 SourceLocation()); 1772 1773 return false; 1774} 1775 1776static bool 1777BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1778 ImplicitInitializerKind ImplicitInitKind, 1779 FieldDecl *Field, 1780 CXXCtorInitializer *&CXXMemberInit) { 1781 if (Field->isInvalidDecl()) 1782 return true; 1783 1784 SourceLocation Loc = Constructor->getLocation(); 1785 1786 if (ImplicitInitKind == IIK_Copy) { 1787 ParmVarDecl *Param = Constructor->getParamDecl(0); 1788 QualType ParamType = Param->getType().getNonReferenceType(); 1789 1790 Expr *MemberExprBase = 1791 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1792 Loc, ParamType, VK_LValue, 0); 1793 1794 // Build a reference to this field within the parameter. 1795 CXXScopeSpec SS; 1796 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1797 Sema::LookupMemberName); 1798 MemberLookup.addDecl(Field, AS_public); 1799 MemberLookup.resolveKind(); 1800 ExprResult CopyCtorArg 1801 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1802 ParamType, Loc, 1803 /*IsArrow=*/false, 1804 SS, 1805 /*FirstQualifierInScope=*/0, 1806 MemberLookup, 1807 /*TemplateArgs=*/0); 1808 if (CopyCtorArg.isInvalid()) 1809 return true; 1810 1811 // When the field we are copying is an array, create index variables for 1812 // each dimension of the array. We use these index variables to subscript 1813 // the source array, and other clients (e.g., CodeGen) will perform the 1814 // necessary iteration with these index variables. 1815 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1816 QualType BaseType = Field->getType(); 1817 QualType SizeType = SemaRef.Context.getSizeType(); 1818 while (const ConstantArrayType *Array 1819 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1820 // Create the iteration variable for this array index. 1821 IdentifierInfo *IterationVarName = 0; 1822 { 1823 llvm::SmallString<8> Str; 1824 llvm::raw_svector_ostream OS(Str); 1825 OS << "__i" << IndexVariables.size(); 1826 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1827 } 1828 VarDecl *IterationVar 1829 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1830 IterationVarName, SizeType, 1831 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1832 SC_None, SC_None); 1833 IndexVariables.push_back(IterationVar); 1834 1835 // Create a reference to the iteration variable. 1836 ExprResult IterationVarRef 1837 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1838 assert(!IterationVarRef.isInvalid() && 1839 "Reference to invented variable cannot fail!"); 1840 1841 // Subscript the array with this iteration variable. 1842 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1843 Loc, 1844 IterationVarRef.take(), 1845 Loc); 1846 if (CopyCtorArg.isInvalid()) 1847 return true; 1848 1849 BaseType = Array->getElementType(); 1850 } 1851 1852 // Construct the entity that we will be initializing. For an array, this 1853 // will be first element in the array, which may require several levels 1854 // of array-subscript entities. 1855 llvm::SmallVector<InitializedEntity, 4> Entities; 1856 Entities.reserve(1 + IndexVariables.size()); 1857 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1858 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1859 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1860 0, 1861 Entities.back())); 1862 1863 // Direct-initialize to use the copy constructor. 1864 InitializationKind InitKind = 1865 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1866 1867 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1868 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1869 &CopyCtorArgE, 1); 1870 1871 ExprResult MemberInit 1872 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1873 MultiExprArg(&CopyCtorArgE, 1)); 1874 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1875 if (MemberInit.isInvalid()) 1876 return true; 1877 1878 CXXMemberInit 1879 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1880 MemberInit.takeAs<Expr>(), Loc, 1881 IndexVariables.data(), 1882 IndexVariables.size()); 1883 return false; 1884 } 1885 1886 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1887 1888 QualType FieldBaseElementType = 1889 SemaRef.Context.getBaseElementType(Field->getType()); 1890 1891 if (FieldBaseElementType->isRecordType()) { 1892 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1893 InitializationKind InitKind = 1894 InitializationKind::CreateDefault(Loc); 1895 1896 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1897 ExprResult MemberInit = 1898 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1899 1900 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1901 if (MemberInit.isInvalid()) 1902 return true; 1903 1904 CXXMemberInit = 1905 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1906 Field, Loc, Loc, 1907 MemberInit.get(), 1908 Loc); 1909 return false; 1910 } 1911 1912 if (FieldBaseElementType->isReferenceType()) { 1913 SemaRef.Diag(Constructor->getLocation(), 1914 diag::err_uninitialized_member_in_ctor) 1915 << (int)Constructor->isImplicit() 1916 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1917 << 0 << Field->getDeclName(); 1918 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1919 return true; 1920 } 1921 1922 if (FieldBaseElementType.isConstQualified()) { 1923 SemaRef.Diag(Constructor->getLocation(), 1924 diag::err_uninitialized_member_in_ctor) 1925 << (int)Constructor->isImplicit() 1926 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1927 << 1 << Field->getDeclName(); 1928 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1929 return true; 1930 } 1931 1932 // Nothing to initialize. 1933 CXXMemberInit = 0; 1934 return false; 1935} 1936 1937namespace { 1938struct BaseAndFieldInfo { 1939 Sema &S; 1940 CXXConstructorDecl *Ctor; 1941 bool AnyErrorsInInits; 1942 ImplicitInitializerKind IIK; 1943 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1944 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1945 1946 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1947 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1948 // FIXME: Handle implicit move constructors. 1949 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1950 IIK = IIK_Copy; 1951 else 1952 IIK = IIK_Default; 1953 } 1954}; 1955} 1956 1957static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1958 FieldDecl *Top, FieldDecl *Field) { 1959 1960 // Overwhelmingly common case: we have a direct initializer for this field. 1961 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1962 Info.AllToInit.push_back(Init); 1963 return false; 1964 } 1965 1966 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1967 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1968 assert(FieldClassType && "anonymous struct/union without record type"); 1969 CXXRecordDecl *FieldClassDecl 1970 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1971 1972 // Even though union members never have non-trivial default 1973 // constructions in C++03, we still build member initializers for aggregate 1974 // record types which can be union members, and C++0x allows non-trivial 1975 // default constructors for union members, so we ensure that only one 1976 // member is initialized for these. 1977 if (FieldClassDecl->isUnion()) { 1978 // First check for an explicit initializer for one field. 1979 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1980 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1981 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1982 Info.AllToInit.push_back(Init); 1983 1984 // Once we've initialized a field of an anonymous union, the union 1985 // field in the class is also initialized, so exit immediately. 1986 return false; 1987 } else if ((*FA)->isAnonymousStructOrUnion()) { 1988 if (CollectFieldInitializer(Info, Top, *FA)) 1989 return true; 1990 } 1991 } 1992 1993 // Fallthrough and construct a default initializer for the union as 1994 // a whole, which can call its default constructor if such a thing exists 1995 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1996 // behavior going forward with C++0x, when anonymous unions there are 1997 // finalized, we should revisit this. 1998 } else { 1999 // For structs, we simply descend through to initialize all members where 2000 // necessary. 2001 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2002 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2003 if (CollectFieldInitializer(Info, Top, *FA)) 2004 return true; 2005 } 2006 } 2007 } 2008 2009 // Don't try to build an implicit initializer if there were semantic 2010 // errors in any of the initializers (and therefore we might be 2011 // missing some that the user actually wrote). 2012 if (Info.AnyErrorsInInits) 2013 return false; 2014 2015 CXXCtorInitializer *Init = 0; 2016 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2017 return true; 2018 2019 if (Init) 2020 Info.AllToInit.push_back(Init); 2021 2022 return false; 2023} 2024 2025bool 2026Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2027 CXXCtorInitializer **Initializers, 2028 unsigned NumInitializers, 2029 bool AnyErrors) { 2030 if (Constructor->getDeclContext()->isDependentContext()) { 2031 // Just store the initializers as written, they will be checked during 2032 // instantiation. 2033 if (NumInitializers > 0) { 2034 Constructor->setNumCtorInitializers(NumInitializers); 2035 CXXCtorInitializer **baseOrMemberInitializers = 2036 new (Context) CXXCtorInitializer*[NumInitializers]; 2037 memcpy(baseOrMemberInitializers, Initializers, 2038 NumInitializers * sizeof(CXXCtorInitializer*)); 2039 Constructor->setCtorInitializers(baseOrMemberInitializers); 2040 } 2041 2042 return false; 2043 } 2044 2045 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2046 2047 // We need to build the initializer AST according to order of construction 2048 // and not what user specified in the Initializers list. 2049 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2050 if (!ClassDecl) 2051 return true; 2052 2053 bool HadError = false; 2054 2055 for (unsigned i = 0; i < NumInitializers; i++) { 2056 CXXCtorInitializer *Member = Initializers[i]; 2057 2058 if (Member->isBaseInitializer()) 2059 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2060 else 2061 Info.AllBaseFields[Member->getAnyMember()] = Member; 2062 } 2063 2064 // Keep track of the direct virtual bases. 2065 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2066 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2067 E = ClassDecl->bases_end(); I != E; ++I) { 2068 if (I->isVirtual()) 2069 DirectVBases.insert(I); 2070 } 2071 2072 // Push virtual bases before others. 2073 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2074 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2075 2076 if (CXXCtorInitializer *Value 2077 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2078 Info.AllToInit.push_back(Value); 2079 } else if (!AnyErrors) { 2080 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2081 CXXCtorInitializer *CXXBaseInit; 2082 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2083 VBase, IsInheritedVirtualBase, 2084 CXXBaseInit)) { 2085 HadError = true; 2086 continue; 2087 } 2088 2089 Info.AllToInit.push_back(CXXBaseInit); 2090 } 2091 } 2092 2093 // Non-virtual bases. 2094 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2095 E = ClassDecl->bases_end(); Base != E; ++Base) { 2096 // Virtuals are in the virtual base list and already constructed. 2097 if (Base->isVirtual()) 2098 continue; 2099 2100 if (CXXCtorInitializer *Value 2101 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2102 Info.AllToInit.push_back(Value); 2103 } else if (!AnyErrors) { 2104 CXXCtorInitializer *CXXBaseInit; 2105 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2106 Base, /*IsInheritedVirtualBase=*/false, 2107 CXXBaseInit)) { 2108 HadError = true; 2109 continue; 2110 } 2111 2112 Info.AllToInit.push_back(CXXBaseInit); 2113 } 2114 } 2115 2116 // Fields. 2117 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2118 E = ClassDecl->field_end(); Field != E; ++Field) { 2119 if ((*Field)->getType()->isIncompleteArrayType()) { 2120 assert(ClassDecl->hasFlexibleArrayMember() && 2121 "Incomplete array type is not valid"); 2122 continue; 2123 } 2124 if (CollectFieldInitializer(Info, *Field, *Field)) 2125 HadError = true; 2126 } 2127 2128 NumInitializers = Info.AllToInit.size(); 2129 if (NumInitializers > 0) { 2130 Constructor->setNumCtorInitializers(NumInitializers); 2131 CXXCtorInitializer **baseOrMemberInitializers = 2132 new (Context) CXXCtorInitializer*[NumInitializers]; 2133 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2134 NumInitializers * sizeof(CXXCtorInitializer*)); 2135 Constructor->setCtorInitializers(baseOrMemberInitializers); 2136 2137 // Constructors implicitly reference the base and member 2138 // destructors. 2139 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2140 Constructor->getParent()); 2141 } 2142 2143 return HadError; 2144} 2145 2146static void *GetKeyForTopLevelField(FieldDecl *Field) { 2147 // For anonymous unions, use the class declaration as the key. 2148 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2149 if (RT->getDecl()->isAnonymousStructOrUnion()) 2150 return static_cast<void *>(RT->getDecl()); 2151 } 2152 return static_cast<void *>(Field); 2153} 2154 2155static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2156 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2157} 2158 2159static void *GetKeyForMember(ASTContext &Context, 2160 CXXCtorInitializer *Member) { 2161 if (!Member->isAnyMemberInitializer()) 2162 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2163 2164 // For fields injected into the class via declaration of an anonymous union, 2165 // use its anonymous union class declaration as the unique key. 2166 FieldDecl *Field = Member->getAnyMember(); 2167 2168 // If the field is a member of an anonymous struct or union, our key 2169 // is the anonymous record decl that's a direct child of the class. 2170 RecordDecl *RD = Field->getParent(); 2171 if (RD->isAnonymousStructOrUnion()) { 2172 while (true) { 2173 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2174 if (Parent->isAnonymousStructOrUnion()) 2175 RD = Parent; 2176 else 2177 break; 2178 } 2179 2180 return static_cast<void *>(RD); 2181 } 2182 2183 return static_cast<void *>(Field); 2184} 2185 2186static void 2187DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2188 const CXXConstructorDecl *Constructor, 2189 CXXCtorInitializer **Inits, 2190 unsigned NumInits) { 2191 if (Constructor->getDeclContext()->isDependentContext()) 2192 return; 2193 2194 // Don't check initializers order unless the warning is enabled at the 2195 // location of at least one initializer. 2196 bool ShouldCheckOrder = false; 2197 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2198 CXXCtorInitializer *Init = Inits[InitIndex]; 2199 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2200 Init->getSourceLocation()) 2201 != Diagnostic::Ignored) { 2202 ShouldCheckOrder = true; 2203 break; 2204 } 2205 } 2206 if (!ShouldCheckOrder) 2207 return; 2208 2209 // Build the list of bases and members in the order that they'll 2210 // actually be initialized. The explicit initializers should be in 2211 // this same order but may be missing things. 2212 llvm::SmallVector<const void*, 32> IdealInitKeys; 2213 2214 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2215 2216 // 1. Virtual bases. 2217 for (CXXRecordDecl::base_class_const_iterator VBase = 2218 ClassDecl->vbases_begin(), 2219 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2220 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2221 2222 // 2. Non-virtual bases. 2223 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2224 E = ClassDecl->bases_end(); Base != E; ++Base) { 2225 if (Base->isVirtual()) 2226 continue; 2227 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2228 } 2229 2230 // 3. Direct fields. 2231 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2232 E = ClassDecl->field_end(); Field != E; ++Field) 2233 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2234 2235 unsigned NumIdealInits = IdealInitKeys.size(); 2236 unsigned IdealIndex = 0; 2237 2238 CXXCtorInitializer *PrevInit = 0; 2239 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2240 CXXCtorInitializer *Init = Inits[InitIndex]; 2241 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2242 2243 // Scan forward to try to find this initializer in the idealized 2244 // initializers list. 2245 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2246 if (InitKey == IdealInitKeys[IdealIndex]) 2247 break; 2248 2249 // If we didn't find this initializer, it must be because we 2250 // scanned past it on a previous iteration. That can only 2251 // happen if we're out of order; emit a warning. 2252 if (IdealIndex == NumIdealInits && PrevInit) { 2253 Sema::SemaDiagnosticBuilder D = 2254 SemaRef.Diag(PrevInit->getSourceLocation(), 2255 diag::warn_initializer_out_of_order); 2256 2257 if (PrevInit->isAnyMemberInitializer()) 2258 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2259 else 2260 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2261 2262 if (Init->isAnyMemberInitializer()) 2263 D << 0 << Init->getAnyMember()->getDeclName(); 2264 else 2265 D << 1 << Init->getBaseClassInfo()->getType(); 2266 2267 // Move back to the initializer's location in the ideal list. 2268 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2269 if (InitKey == IdealInitKeys[IdealIndex]) 2270 break; 2271 2272 assert(IdealIndex != NumIdealInits && 2273 "initializer not found in initializer list"); 2274 } 2275 2276 PrevInit = Init; 2277 } 2278} 2279 2280namespace { 2281bool CheckRedundantInit(Sema &S, 2282 CXXCtorInitializer *Init, 2283 CXXCtorInitializer *&PrevInit) { 2284 if (!PrevInit) { 2285 PrevInit = Init; 2286 return false; 2287 } 2288 2289 if (FieldDecl *Field = Init->getMember()) 2290 S.Diag(Init->getSourceLocation(), 2291 diag::err_multiple_mem_initialization) 2292 << Field->getDeclName() 2293 << Init->getSourceRange(); 2294 else { 2295 const Type *BaseClass = Init->getBaseClass(); 2296 assert(BaseClass && "neither field nor base"); 2297 S.Diag(Init->getSourceLocation(), 2298 diag::err_multiple_base_initialization) 2299 << QualType(BaseClass, 0) 2300 << Init->getSourceRange(); 2301 } 2302 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2303 << 0 << PrevInit->getSourceRange(); 2304 2305 return true; 2306} 2307 2308typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2309typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2310 2311bool CheckRedundantUnionInit(Sema &S, 2312 CXXCtorInitializer *Init, 2313 RedundantUnionMap &Unions) { 2314 FieldDecl *Field = Init->getAnyMember(); 2315 RecordDecl *Parent = Field->getParent(); 2316 if (!Parent->isAnonymousStructOrUnion()) 2317 return false; 2318 2319 NamedDecl *Child = Field; 2320 do { 2321 if (Parent->isUnion()) { 2322 UnionEntry &En = Unions[Parent]; 2323 if (En.first && En.first != Child) { 2324 S.Diag(Init->getSourceLocation(), 2325 diag::err_multiple_mem_union_initialization) 2326 << Field->getDeclName() 2327 << Init->getSourceRange(); 2328 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2329 << 0 << En.second->getSourceRange(); 2330 return true; 2331 } else if (!En.first) { 2332 En.first = Child; 2333 En.second = Init; 2334 } 2335 } 2336 2337 Child = Parent; 2338 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2339 } while (Parent->isAnonymousStructOrUnion()); 2340 2341 return false; 2342} 2343} 2344 2345/// ActOnMemInitializers - Handle the member initializers for a constructor. 2346void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2347 SourceLocation ColonLoc, 2348 MemInitTy **meminits, unsigned NumMemInits, 2349 bool AnyErrors) { 2350 if (!ConstructorDecl) 2351 return; 2352 2353 AdjustDeclIfTemplate(ConstructorDecl); 2354 2355 CXXConstructorDecl *Constructor 2356 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2357 2358 if (!Constructor) { 2359 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2360 return; 2361 } 2362 2363 CXXCtorInitializer **MemInits = 2364 reinterpret_cast<CXXCtorInitializer **>(meminits); 2365 2366 // Mapping for the duplicate initializers check. 2367 // For member initializers, this is keyed with a FieldDecl*. 2368 // For base initializers, this is keyed with a Type*. 2369 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2370 2371 // Mapping for the inconsistent anonymous-union initializers check. 2372 RedundantUnionMap MemberUnions; 2373 2374 bool HadError = false; 2375 for (unsigned i = 0; i < NumMemInits; i++) { 2376 CXXCtorInitializer *Init = MemInits[i]; 2377 2378 // Set the source order index. 2379 Init->setSourceOrder(i); 2380 2381 if (Init->isAnyMemberInitializer()) { 2382 FieldDecl *Field = Init->getAnyMember(); 2383 if (CheckRedundantInit(*this, Init, Members[Field]) || 2384 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2385 HadError = true; 2386 } else if (Init->isBaseInitializer()) { 2387 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2388 if (CheckRedundantInit(*this, Init, Members[Key])) 2389 HadError = true; 2390 } else { 2391 assert(Init->isDelegatingInitializer()); 2392 // This must be the only initializer 2393 if (i != 0 || NumMemInits > 1) { 2394 Diag(MemInits[0]->getSourceLocation(), 2395 diag::err_delegating_initializer_alone) 2396 << MemInits[0]->getSourceRange(); 2397 HadError = true; 2398 } 2399 } 2400 } 2401 2402 if (HadError) 2403 return; 2404 2405 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2406 2407 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2408} 2409 2410void 2411Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2412 CXXRecordDecl *ClassDecl) { 2413 // Ignore dependent contexts. 2414 if (ClassDecl->isDependentContext()) 2415 return; 2416 2417 // FIXME: all the access-control diagnostics are positioned on the 2418 // field/base declaration. That's probably good; that said, the 2419 // user might reasonably want to know why the destructor is being 2420 // emitted, and we currently don't say. 2421 2422 // Non-static data members. 2423 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2424 E = ClassDecl->field_end(); I != E; ++I) { 2425 FieldDecl *Field = *I; 2426 if (Field->isInvalidDecl()) 2427 continue; 2428 QualType FieldType = Context.getBaseElementType(Field->getType()); 2429 2430 const RecordType* RT = FieldType->getAs<RecordType>(); 2431 if (!RT) 2432 continue; 2433 2434 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2435 if (FieldClassDecl->hasTrivialDestructor()) 2436 continue; 2437 2438 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2439 CheckDestructorAccess(Field->getLocation(), Dtor, 2440 PDiag(diag::err_access_dtor_field) 2441 << Field->getDeclName() 2442 << FieldType); 2443 2444 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2445 } 2446 2447 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2448 2449 // Bases. 2450 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2451 E = ClassDecl->bases_end(); Base != E; ++Base) { 2452 // Bases are always records in a well-formed non-dependent class. 2453 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2454 2455 // Remember direct virtual bases. 2456 if (Base->isVirtual()) 2457 DirectVirtualBases.insert(RT); 2458 2459 // Ignore trivial destructors. 2460 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2461 if (BaseClassDecl->hasTrivialDestructor()) 2462 continue; 2463 2464 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2465 2466 // FIXME: caret should be on the start of the class name 2467 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2468 PDiag(diag::err_access_dtor_base) 2469 << Base->getType() 2470 << Base->getSourceRange()); 2471 2472 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2473 } 2474 2475 // Virtual bases. 2476 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2477 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2478 2479 // Bases are always records in a well-formed non-dependent class. 2480 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2481 2482 // Ignore direct virtual bases. 2483 if (DirectVirtualBases.count(RT)) 2484 continue; 2485 2486 // Ignore trivial destructors. 2487 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2488 if (BaseClassDecl->hasTrivialDestructor()) 2489 continue; 2490 2491 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2492 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2493 PDiag(diag::err_access_dtor_vbase) 2494 << VBase->getType()); 2495 2496 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2497 } 2498} 2499 2500void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2501 if (!CDtorDecl) 2502 return; 2503 2504 if (CXXConstructorDecl *Constructor 2505 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2506 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2507} 2508 2509bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2510 unsigned DiagID, AbstractDiagSelID SelID) { 2511 if (SelID == -1) 2512 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2513 else 2514 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2515} 2516 2517bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2518 const PartialDiagnostic &PD) { 2519 if (!getLangOptions().CPlusPlus) 2520 return false; 2521 2522 if (const ArrayType *AT = Context.getAsArrayType(T)) 2523 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2524 2525 if (const PointerType *PT = T->getAs<PointerType>()) { 2526 // Find the innermost pointer type. 2527 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2528 PT = T; 2529 2530 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2531 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2532 } 2533 2534 const RecordType *RT = T->getAs<RecordType>(); 2535 if (!RT) 2536 return false; 2537 2538 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2539 2540 // We can't answer whether something is abstract until it has a 2541 // definition. If it's currently being defined, we'll walk back 2542 // over all the declarations when we have a full definition. 2543 const CXXRecordDecl *Def = RD->getDefinition(); 2544 if (!Def || Def->isBeingDefined()) 2545 return false; 2546 2547 if (!RD->isAbstract()) 2548 return false; 2549 2550 Diag(Loc, PD) << RD->getDeclName(); 2551 DiagnoseAbstractType(RD); 2552 2553 return true; 2554} 2555 2556void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2557 // Check if we've already emitted the list of pure virtual functions 2558 // for this class. 2559 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2560 return; 2561 2562 CXXFinalOverriderMap FinalOverriders; 2563 RD->getFinalOverriders(FinalOverriders); 2564 2565 // Keep a set of seen pure methods so we won't diagnose the same method 2566 // more than once. 2567 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2568 2569 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2570 MEnd = FinalOverriders.end(); 2571 M != MEnd; 2572 ++M) { 2573 for (OverridingMethods::iterator SO = M->second.begin(), 2574 SOEnd = M->second.end(); 2575 SO != SOEnd; ++SO) { 2576 // C++ [class.abstract]p4: 2577 // A class is abstract if it contains or inherits at least one 2578 // pure virtual function for which the final overrider is pure 2579 // virtual. 2580 2581 // 2582 if (SO->second.size() != 1) 2583 continue; 2584 2585 if (!SO->second.front().Method->isPure()) 2586 continue; 2587 2588 if (!SeenPureMethods.insert(SO->second.front().Method)) 2589 continue; 2590 2591 Diag(SO->second.front().Method->getLocation(), 2592 diag::note_pure_virtual_function) 2593 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2594 } 2595 } 2596 2597 if (!PureVirtualClassDiagSet) 2598 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2599 PureVirtualClassDiagSet->insert(RD); 2600} 2601 2602namespace { 2603struct AbstractUsageInfo { 2604 Sema &S; 2605 CXXRecordDecl *Record; 2606 CanQualType AbstractType; 2607 bool Invalid; 2608 2609 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2610 : S(S), Record(Record), 2611 AbstractType(S.Context.getCanonicalType( 2612 S.Context.getTypeDeclType(Record))), 2613 Invalid(false) {} 2614 2615 void DiagnoseAbstractType() { 2616 if (Invalid) return; 2617 S.DiagnoseAbstractType(Record); 2618 Invalid = true; 2619 } 2620 2621 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2622}; 2623 2624struct CheckAbstractUsage { 2625 AbstractUsageInfo &Info; 2626 const NamedDecl *Ctx; 2627 2628 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2629 : Info(Info), Ctx(Ctx) {} 2630 2631 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2632 switch (TL.getTypeLocClass()) { 2633#define ABSTRACT_TYPELOC(CLASS, PARENT) 2634#define TYPELOC(CLASS, PARENT) \ 2635 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2636#include "clang/AST/TypeLocNodes.def" 2637 } 2638 } 2639 2640 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2641 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2642 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2643 if (!TL.getArg(I)) 2644 continue; 2645 2646 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2647 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2648 } 2649 } 2650 2651 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2652 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2653 } 2654 2655 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2656 // Visit the type parameters from a permissive context. 2657 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2658 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2659 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2660 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2661 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2662 // TODO: other template argument types? 2663 } 2664 } 2665 2666 // Visit pointee types from a permissive context. 2667#define CheckPolymorphic(Type) \ 2668 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2669 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2670 } 2671 CheckPolymorphic(PointerTypeLoc) 2672 CheckPolymorphic(ReferenceTypeLoc) 2673 CheckPolymorphic(MemberPointerTypeLoc) 2674 CheckPolymorphic(BlockPointerTypeLoc) 2675 2676 /// Handle all the types we haven't given a more specific 2677 /// implementation for above. 2678 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2679 // Every other kind of type that we haven't called out already 2680 // that has an inner type is either (1) sugar or (2) contains that 2681 // inner type in some way as a subobject. 2682 if (TypeLoc Next = TL.getNextTypeLoc()) 2683 return Visit(Next, Sel); 2684 2685 // If there's no inner type and we're in a permissive context, 2686 // don't diagnose. 2687 if (Sel == Sema::AbstractNone) return; 2688 2689 // Check whether the type matches the abstract type. 2690 QualType T = TL.getType(); 2691 if (T->isArrayType()) { 2692 Sel = Sema::AbstractArrayType; 2693 T = Info.S.Context.getBaseElementType(T); 2694 } 2695 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2696 if (CT != Info.AbstractType) return; 2697 2698 // It matched; do some magic. 2699 if (Sel == Sema::AbstractArrayType) { 2700 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2701 << T << TL.getSourceRange(); 2702 } else { 2703 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2704 << Sel << T << TL.getSourceRange(); 2705 } 2706 Info.DiagnoseAbstractType(); 2707 } 2708}; 2709 2710void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2711 Sema::AbstractDiagSelID Sel) { 2712 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2713} 2714 2715} 2716 2717/// Check for invalid uses of an abstract type in a method declaration. 2718static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2719 CXXMethodDecl *MD) { 2720 // No need to do the check on definitions, which require that 2721 // the return/param types be complete. 2722 if (MD->isThisDeclarationADefinition()) 2723 return; 2724 2725 // For safety's sake, just ignore it if we don't have type source 2726 // information. This should never happen for non-implicit methods, 2727 // but... 2728 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2729 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2730} 2731 2732/// Check for invalid uses of an abstract type within a class definition. 2733static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2734 CXXRecordDecl *RD) { 2735 for (CXXRecordDecl::decl_iterator 2736 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2737 Decl *D = *I; 2738 if (D->isImplicit()) continue; 2739 2740 // Methods and method templates. 2741 if (isa<CXXMethodDecl>(D)) { 2742 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2743 } else if (isa<FunctionTemplateDecl>(D)) { 2744 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2745 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2746 2747 // Fields and static variables. 2748 } else if (isa<FieldDecl>(D)) { 2749 FieldDecl *FD = cast<FieldDecl>(D); 2750 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2751 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2752 } else if (isa<VarDecl>(D)) { 2753 VarDecl *VD = cast<VarDecl>(D); 2754 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2755 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2756 2757 // Nested classes and class templates. 2758 } else if (isa<CXXRecordDecl>(D)) { 2759 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2760 } else if (isa<ClassTemplateDecl>(D)) { 2761 CheckAbstractClassUsage(Info, 2762 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2763 } 2764 } 2765} 2766 2767/// \brief Perform semantic checks on a class definition that has been 2768/// completing, introducing implicitly-declared members, checking for 2769/// abstract types, etc. 2770void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2771 if (!Record) 2772 return; 2773 2774 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2775 AbstractUsageInfo Info(*this, Record); 2776 CheckAbstractClassUsage(Info, Record); 2777 } 2778 2779 // If this is not an aggregate type and has no user-declared constructor, 2780 // complain about any non-static data members of reference or const scalar 2781 // type, since they will never get initializers. 2782 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2783 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2784 bool Complained = false; 2785 for (RecordDecl::field_iterator F = Record->field_begin(), 2786 FEnd = Record->field_end(); 2787 F != FEnd; ++F) { 2788 if (F->getType()->isReferenceType() || 2789 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2790 if (!Complained) { 2791 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2792 << Record->getTagKind() << Record; 2793 Complained = true; 2794 } 2795 2796 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2797 << F->getType()->isReferenceType() 2798 << F->getDeclName(); 2799 } 2800 } 2801 } 2802 2803 if (Record->isDynamicClass() && !Record->isDependentType()) 2804 DynamicClasses.push_back(Record); 2805 2806 if (Record->getIdentifier()) { 2807 // C++ [class.mem]p13: 2808 // If T is the name of a class, then each of the following shall have a 2809 // name different from T: 2810 // - every member of every anonymous union that is a member of class T. 2811 // 2812 // C++ [class.mem]p14: 2813 // In addition, if class T has a user-declared constructor (12.1), every 2814 // non-static data member of class T shall have a name different from T. 2815 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2816 R.first != R.second; ++R.first) { 2817 NamedDecl *D = *R.first; 2818 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2819 isa<IndirectFieldDecl>(D)) { 2820 Diag(D->getLocation(), diag::err_member_name_of_class) 2821 << D->getDeclName(); 2822 break; 2823 } 2824 } 2825 } 2826 2827 // Warn if the class has virtual methods but non-virtual public destructor. 2828 if (Record->isPolymorphic() && !Record->isDependentType()) { 2829 CXXDestructorDecl *dtor = Record->getDestructor(); 2830 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2831 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2832 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2833 } 2834 2835 // See if a method overloads virtual methods in a base 2836 /// class without overriding any. 2837 if (!Record->isDependentType()) { 2838 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2839 MEnd = Record->method_end(); 2840 M != MEnd; ++M) { 2841 DiagnoseHiddenVirtualMethods(Record, *M); 2842 } 2843 } 2844 2845 // Declare inherited constructors. We do this eagerly here because: 2846 // - The standard requires an eager diagnostic for conflicting inherited 2847 // constructors from different classes. 2848 // - The lazy declaration of the other implicit constructors is so as to not 2849 // waste space and performance on classes that are not meant to be 2850 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2851 // have inherited constructors. 2852 DeclareInheritedConstructors(Record); 2853} 2854 2855/// \brief Data used with FindHiddenVirtualMethod 2856struct FindHiddenVirtualMethodData { 2857 Sema *S; 2858 CXXMethodDecl *Method; 2859 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2860 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2861}; 2862 2863/// \brief Member lookup function that determines whether a given C++ 2864/// method overloads virtual methods in a base class without overriding any, 2865/// to be used with CXXRecordDecl::lookupInBases(). 2866static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2867 CXXBasePath &Path, 2868 void *UserData) { 2869 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2870 2871 FindHiddenVirtualMethodData &Data 2872 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2873 2874 DeclarationName Name = Data.Method->getDeclName(); 2875 assert(Name.getNameKind() == DeclarationName::Identifier); 2876 2877 bool foundSameNameMethod = false; 2878 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2879 for (Path.Decls = BaseRecord->lookup(Name); 2880 Path.Decls.first != Path.Decls.second; 2881 ++Path.Decls.first) { 2882 NamedDecl *D = *Path.Decls.first; 2883 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2884 MD = MD->getCanonicalDecl(); 2885 foundSameNameMethod = true; 2886 // Interested only in hidden virtual methods. 2887 if (!MD->isVirtual()) 2888 continue; 2889 // If the method we are checking overrides a method from its base 2890 // don't warn about the other overloaded methods. 2891 if (!Data.S->IsOverload(Data.Method, MD, false)) 2892 return true; 2893 // Collect the overload only if its hidden. 2894 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2895 overloadedMethods.push_back(MD); 2896 } 2897 } 2898 2899 if (foundSameNameMethod) 2900 Data.OverloadedMethods.append(overloadedMethods.begin(), 2901 overloadedMethods.end()); 2902 return foundSameNameMethod; 2903} 2904 2905/// \brief See if a method overloads virtual methods in a base class without 2906/// overriding any. 2907void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2908 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2909 MD->getLocation()) == Diagnostic::Ignored) 2910 return; 2911 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2912 return; 2913 2914 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2915 /*bool RecordPaths=*/false, 2916 /*bool DetectVirtual=*/false); 2917 FindHiddenVirtualMethodData Data; 2918 Data.Method = MD; 2919 Data.S = this; 2920 2921 // Keep the base methods that were overriden or introduced in the subclass 2922 // by 'using' in a set. A base method not in this set is hidden. 2923 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2924 res.first != res.second; ++res.first) { 2925 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2926 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2927 E = MD->end_overridden_methods(); 2928 I != E; ++I) 2929 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2930 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2931 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2932 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2933 } 2934 2935 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2936 !Data.OverloadedMethods.empty()) { 2937 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2938 << MD << (Data.OverloadedMethods.size() > 1); 2939 2940 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2941 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2942 Diag(overloadedMD->getLocation(), 2943 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2944 } 2945 } 2946} 2947 2948void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2949 Decl *TagDecl, 2950 SourceLocation LBrac, 2951 SourceLocation RBrac, 2952 AttributeList *AttrList) { 2953 if (!TagDecl) 2954 return; 2955 2956 AdjustDeclIfTemplate(TagDecl); 2957 2958 ActOnFields(S, RLoc, TagDecl, 2959 // strict aliasing violation! 2960 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2961 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2962 2963 CheckCompletedCXXClass( 2964 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2965} 2966 2967namespace { 2968 /// \brief Helper class that collects exception specifications for 2969 /// implicitly-declared special member functions. 2970 class ImplicitExceptionSpecification { 2971 ASTContext &Context; 2972 bool AllowsAllExceptions; 2973 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2974 llvm::SmallVector<QualType, 4> Exceptions; 2975 2976 public: 2977 explicit ImplicitExceptionSpecification(ASTContext &Context) 2978 : Context(Context), AllowsAllExceptions(false) { } 2979 2980 /// \brief Whether the special member function should have any 2981 /// exception specification at all. 2982 bool hasExceptionSpecification() const { 2983 return !AllowsAllExceptions; 2984 } 2985 2986 /// \brief Whether the special member function should have a 2987 /// throw(...) exception specification (a Microsoft extension). 2988 bool hasAnyExceptionSpecification() const { 2989 return false; 2990 } 2991 2992 /// \brief The number of exceptions in the exception specification. 2993 unsigned size() const { return Exceptions.size(); } 2994 2995 /// \brief The set of exceptions in the exception specification. 2996 const QualType *data() const { return Exceptions.data(); } 2997 2998 /// \brief Note that 2999 void CalledDecl(CXXMethodDecl *Method) { 3000 // If we already know that we allow all exceptions, do nothing. 3001 if (AllowsAllExceptions || !Method) 3002 return; 3003 3004 const FunctionProtoType *Proto 3005 = Method->getType()->getAs<FunctionProtoType>(); 3006 3007 // If this function can throw any exceptions, make a note of that. 3008 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 3009 AllowsAllExceptions = true; 3010 ExceptionsSeen.clear(); 3011 Exceptions.clear(); 3012 return; 3013 } 3014 3015 // Record the exceptions in this function's exception specification. 3016 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3017 EEnd = Proto->exception_end(); 3018 E != EEnd; ++E) 3019 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3020 Exceptions.push_back(*E); 3021 } 3022 }; 3023} 3024 3025 3026/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3027/// special functions, such as the default constructor, copy 3028/// constructor, or destructor, to the given C++ class (C++ 3029/// [special]p1). This routine can only be executed just before the 3030/// definition of the class is complete. 3031void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3032 if (!ClassDecl->hasUserDeclaredConstructor()) 3033 ++ASTContext::NumImplicitDefaultConstructors; 3034 3035 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3036 ++ASTContext::NumImplicitCopyConstructors; 3037 3038 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3039 ++ASTContext::NumImplicitCopyAssignmentOperators; 3040 3041 // If we have a dynamic class, then the copy assignment operator may be 3042 // virtual, so we have to declare it immediately. This ensures that, e.g., 3043 // it shows up in the right place in the vtable and that we diagnose 3044 // problems with the implicit exception specification. 3045 if (ClassDecl->isDynamicClass()) 3046 DeclareImplicitCopyAssignment(ClassDecl); 3047 } 3048 3049 if (!ClassDecl->hasUserDeclaredDestructor()) { 3050 ++ASTContext::NumImplicitDestructors; 3051 3052 // If we have a dynamic class, then the destructor may be virtual, so we 3053 // have to declare the destructor immediately. This ensures that, e.g., it 3054 // shows up in the right place in the vtable and that we diagnose problems 3055 // with the implicit exception specification. 3056 if (ClassDecl->isDynamicClass()) 3057 DeclareImplicitDestructor(ClassDecl); 3058 } 3059} 3060 3061void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3062 if (!D) 3063 return; 3064 3065 TemplateParameterList *Params = 0; 3066 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3067 Params = Template->getTemplateParameters(); 3068 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3069 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3070 Params = PartialSpec->getTemplateParameters(); 3071 else 3072 return; 3073 3074 for (TemplateParameterList::iterator Param = Params->begin(), 3075 ParamEnd = Params->end(); 3076 Param != ParamEnd; ++Param) { 3077 NamedDecl *Named = cast<NamedDecl>(*Param); 3078 if (Named->getDeclName()) { 3079 S->AddDecl(Named); 3080 IdResolver.AddDecl(Named); 3081 } 3082 } 3083} 3084 3085void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3086 if (!RecordD) return; 3087 AdjustDeclIfTemplate(RecordD); 3088 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3089 PushDeclContext(S, Record); 3090} 3091 3092void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3093 if (!RecordD) return; 3094 PopDeclContext(); 3095} 3096 3097/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3098/// parsing a top-level (non-nested) C++ class, and we are now 3099/// parsing those parts of the given Method declaration that could 3100/// not be parsed earlier (C++ [class.mem]p2), such as default 3101/// arguments. This action should enter the scope of the given 3102/// Method declaration as if we had just parsed the qualified method 3103/// name. However, it should not bring the parameters into scope; 3104/// that will be performed by ActOnDelayedCXXMethodParameter. 3105void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3106} 3107 3108/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3109/// C++ method declaration. We're (re-)introducing the given 3110/// function parameter into scope for use in parsing later parts of 3111/// the method declaration. For example, we could see an 3112/// ActOnParamDefaultArgument event for this parameter. 3113void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3114 if (!ParamD) 3115 return; 3116 3117 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3118 3119 // If this parameter has an unparsed default argument, clear it out 3120 // to make way for the parsed default argument. 3121 if (Param->hasUnparsedDefaultArg()) 3122 Param->setDefaultArg(0); 3123 3124 S->AddDecl(Param); 3125 if (Param->getDeclName()) 3126 IdResolver.AddDecl(Param); 3127} 3128 3129/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3130/// processing the delayed method declaration for Method. The method 3131/// declaration is now considered finished. There may be a separate 3132/// ActOnStartOfFunctionDef action later (not necessarily 3133/// immediately!) for this method, if it was also defined inside the 3134/// class body. 3135void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3136 if (!MethodD) 3137 return; 3138 3139 AdjustDeclIfTemplate(MethodD); 3140 3141 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3142 3143 // Now that we have our default arguments, check the constructor 3144 // again. It could produce additional diagnostics or affect whether 3145 // the class has implicitly-declared destructors, among other 3146 // things. 3147 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3148 CheckConstructor(Constructor); 3149 3150 // Check the default arguments, which we may have added. 3151 if (!Method->isInvalidDecl()) 3152 CheckCXXDefaultArguments(Method); 3153} 3154 3155/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3156/// the well-formedness of the constructor declarator @p D with type @p 3157/// R. If there are any errors in the declarator, this routine will 3158/// emit diagnostics and set the invalid bit to true. In any case, the type 3159/// will be updated to reflect a well-formed type for the constructor and 3160/// returned. 3161QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3162 StorageClass &SC) { 3163 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3164 3165 // C++ [class.ctor]p3: 3166 // A constructor shall not be virtual (10.3) or static (9.4). A 3167 // constructor can be invoked for a const, volatile or const 3168 // volatile object. A constructor shall not be declared const, 3169 // volatile, or const volatile (9.3.2). 3170 if (isVirtual) { 3171 if (!D.isInvalidType()) 3172 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3173 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3174 << SourceRange(D.getIdentifierLoc()); 3175 D.setInvalidType(); 3176 } 3177 if (SC == SC_Static) { 3178 if (!D.isInvalidType()) 3179 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3180 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3181 << SourceRange(D.getIdentifierLoc()); 3182 D.setInvalidType(); 3183 SC = SC_None; 3184 } 3185 3186 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3187 if (FTI.TypeQuals != 0) { 3188 if (FTI.TypeQuals & Qualifiers::Const) 3189 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3190 << "const" << SourceRange(D.getIdentifierLoc()); 3191 if (FTI.TypeQuals & Qualifiers::Volatile) 3192 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3193 << "volatile" << SourceRange(D.getIdentifierLoc()); 3194 if (FTI.TypeQuals & Qualifiers::Restrict) 3195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3196 << "restrict" << SourceRange(D.getIdentifierLoc()); 3197 D.setInvalidType(); 3198 } 3199 3200 // C++0x [class.ctor]p4: 3201 // A constructor shall not be declared with a ref-qualifier. 3202 if (FTI.hasRefQualifier()) { 3203 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3204 << FTI.RefQualifierIsLValueRef 3205 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3206 D.setInvalidType(); 3207 } 3208 3209 // Rebuild the function type "R" without any type qualifiers (in 3210 // case any of the errors above fired) and with "void" as the 3211 // return type, since constructors don't have return types. 3212 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3213 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3214 return R; 3215 3216 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3217 EPI.TypeQuals = 0; 3218 EPI.RefQualifier = RQ_None; 3219 3220 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3221 Proto->getNumArgs(), EPI); 3222} 3223 3224/// CheckConstructor - Checks a fully-formed constructor for 3225/// well-formedness, issuing any diagnostics required. Returns true if 3226/// the constructor declarator is invalid. 3227void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3228 CXXRecordDecl *ClassDecl 3229 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3230 if (!ClassDecl) 3231 return Constructor->setInvalidDecl(); 3232 3233 // C++ [class.copy]p3: 3234 // A declaration of a constructor for a class X is ill-formed if 3235 // its first parameter is of type (optionally cv-qualified) X and 3236 // either there are no other parameters or else all other 3237 // parameters have default arguments. 3238 if (!Constructor->isInvalidDecl() && 3239 ((Constructor->getNumParams() == 1) || 3240 (Constructor->getNumParams() > 1 && 3241 Constructor->getParamDecl(1)->hasDefaultArg())) && 3242 Constructor->getTemplateSpecializationKind() 3243 != TSK_ImplicitInstantiation) { 3244 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3245 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3246 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3247 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3248 const char *ConstRef 3249 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3250 : " const &"; 3251 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3252 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3253 3254 // FIXME: Rather that making the constructor invalid, we should endeavor 3255 // to fix the type. 3256 Constructor->setInvalidDecl(); 3257 } 3258 } 3259} 3260 3261/// CheckDestructor - Checks a fully-formed destructor definition for 3262/// well-formedness, issuing any diagnostics required. Returns true 3263/// on error. 3264bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3265 CXXRecordDecl *RD = Destructor->getParent(); 3266 3267 if (Destructor->isVirtual()) { 3268 SourceLocation Loc; 3269 3270 if (!Destructor->isImplicit()) 3271 Loc = Destructor->getLocation(); 3272 else 3273 Loc = RD->getLocation(); 3274 3275 // If we have a virtual destructor, look up the deallocation function 3276 FunctionDecl *OperatorDelete = 0; 3277 DeclarationName Name = 3278 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3279 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3280 return true; 3281 3282 MarkDeclarationReferenced(Loc, OperatorDelete); 3283 3284 Destructor->setOperatorDelete(OperatorDelete); 3285 } 3286 3287 return false; 3288} 3289 3290static inline bool 3291FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3292 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3293 FTI.ArgInfo[0].Param && 3294 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3295} 3296 3297/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3298/// the well-formednes of the destructor declarator @p D with type @p 3299/// R. If there are any errors in the declarator, this routine will 3300/// emit diagnostics and set the declarator to invalid. Even if this happens, 3301/// will be updated to reflect a well-formed type for the destructor and 3302/// returned. 3303QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3304 StorageClass& SC) { 3305 // C++ [class.dtor]p1: 3306 // [...] A typedef-name that names a class is a class-name 3307 // (7.1.3); however, a typedef-name that names a class shall not 3308 // be used as the identifier in the declarator for a destructor 3309 // declaration. 3310 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3311 if (isa<TypedefType>(DeclaratorType)) 3312 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3313 << DeclaratorType; 3314 3315 // C++ [class.dtor]p2: 3316 // A destructor is used to destroy objects of its class type. A 3317 // destructor takes no parameters, and no return type can be 3318 // specified for it (not even void). The address of a destructor 3319 // shall not be taken. A destructor shall not be static. A 3320 // destructor can be invoked for a const, volatile or const 3321 // volatile object. A destructor shall not be declared const, 3322 // volatile or const volatile (9.3.2). 3323 if (SC == SC_Static) { 3324 if (!D.isInvalidType()) 3325 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3326 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3327 << SourceRange(D.getIdentifierLoc()) 3328 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3329 3330 SC = SC_None; 3331 } 3332 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3333 // Destructors don't have return types, but the parser will 3334 // happily parse something like: 3335 // 3336 // class X { 3337 // float ~X(); 3338 // }; 3339 // 3340 // The return type will be eliminated later. 3341 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3342 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3343 << SourceRange(D.getIdentifierLoc()); 3344 } 3345 3346 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3347 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3348 if (FTI.TypeQuals & Qualifiers::Const) 3349 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3350 << "const" << SourceRange(D.getIdentifierLoc()); 3351 if (FTI.TypeQuals & Qualifiers::Volatile) 3352 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3353 << "volatile" << SourceRange(D.getIdentifierLoc()); 3354 if (FTI.TypeQuals & Qualifiers::Restrict) 3355 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3356 << "restrict" << SourceRange(D.getIdentifierLoc()); 3357 D.setInvalidType(); 3358 } 3359 3360 // C++0x [class.dtor]p2: 3361 // A destructor shall not be declared with a ref-qualifier. 3362 if (FTI.hasRefQualifier()) { 3363 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3364 << FTI.RefQualifierIsLValueRef 3365 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3366 D.setInvalidType(); 3367 } 3368 3369 // Make sure we don't have any parameters. 3370 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3371 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3372 3373 // Delete the parameters. 3374 FTI.freeArgs(); 3375 D.setInvalidType(); 3376 } 3377 3378 // Make sure the destructor isn't variadic. 3379 if (FTI.isVariadic) { 3380 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3381 D.setInvalidType(); 3382 } 3383 3384 // Rebuild the function type "R" without any type qualifiers or 3385 // parameters (in case any of the errors above fired) and with 3386 // "void" as the return type, since destructors don't have return 3387 // types. 3388 if (!D.isInvalidType()) 3389 return R; 3390 3391 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3392 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3393 EPI.Variadic = false; 3394 EPI.TypeQuals = 0; 3395 EPI.RefQualifier = RQ_None; 3396 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3397} 3398 3399/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3400/// well-formednes of the conversion function declarator @p D with 3401/// type @p R. If there are any errors in the declarator, this routine 3402/// will emit diagnostics and return true. Otherwise, it will return 3403/// false. Either way, the type @p R will be updated to reflect a 3404/// well-formed type for the conversion operator. 3405void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3406 StorageClass& SC) { 3407 // C++ [class.conv.fct]p1: 3408 // Neither parameter types nor return type can be specified. The 3409 // type of a conversion function (8.3.5) is "function taking no 3410 // parameter returning conversion-type-id." 3411 if (SC == SC_Static) { 3412 if (!D.isInvalidType()) 3413 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3414 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3415 << SourceRange(D.getIdentifierLoc()); 3416 D.setInvalidType(); 3417 SC = SC_None; 3418 } 3419 3420 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3421 3422 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3423 // Conversion functions don't have return types, but the parser will 3424 // happily parse something like: 3425 // 3426 // class X { 3427 // float operator bool(); 3428 // }; 3429 // 3430 // The return type will be changed later anyway. 3431 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3432 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3433 << SourceRange(D.getIdentifierLoc()); 3434 D.setInvalidType(); 3435 } 3436 3437 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3438 3439 // Make sure we don't have any parameters. 3440 if (Proto->getNumArgs() > 0) { 3441 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3442 3443 // Delete the parameters. 3444 D.getFunctionTypeInfo().freeArgs(); 3445 D.setInvalidType(); 3446 } else if (Proto->isVariadic()) { 3447 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3448 D.setInvalidType(); 3449 } 3450 3451 // Diagnose "&operator bool()" and other such nonsense. This 3452 // is actually a gcc extension which we don't support. 3453 if (Proto->getResultType() != ConvType) { 3454 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3455 << Proto->getResultType(); 3456 D.setInvalidType(); 3457 ConvType = Proto->getResultType(); 3458 } 3459 3460 // C++ [class.conv.fct]p4: 3461 // The conversion-type-id shall not represent a function type nor 3462 // an array type. 3463 if (ConvType->isArrayType()) { 3464 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3465 ConvType = Context.getPointerType(ConvType); 3466 D.setInvalidType(); 3467 } else if (ConvType->isFunctionType()) { 3468 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3469 ConvType = Context.getPointerType(ConvType); 3470 D.setInvalidType(); 3471 } 3472 3473 // Rebuild the function type "R" without any parameters (in case any 3474 // of the errors above fired) and with the conversion type as the 3475 // return type. 3476 if (D.isInvalidType()) 3477 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3478 3479 // C++0x explicit conversion operators. 3480 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3481 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3482 diag::warn_explicit_conversion_functions) 3483 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3484} 3485 3486/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3487/// the declaration of the given C++ conversion function. This routine 3488/// is responsible for recording the conversion function in the C++ 3489/// class, if possible. 3490Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3491 assert(Conversion && "Expected to receive a conversion function declaration"); 3492 3493 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3494 3495 // Make sure we aren't redeclaring the conversion function. 3496 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3497 3498 // C++ [class.conv.fct]p1: 3499 // [...] A conversion function is never used to convert a 3500 // (possibly cv-qualified) object to the (possibly cv-qualified) 3501 // same object type (or a reference to it), to a (possibly 3502 // cv-qualified) base class of that type (or a reference to it), 3503 // or to (possibly cv-qualified) void. 3504 // FIXME: Suppress this warning if the conversion function ends up being a 3505 // virtual function that overrides a virtual function in a base class. 3506 QualType ClassType 3507 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3508 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3509 ConvType = ConvTypeRef->getPointeeType(); 3510 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3511 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3512 /* Suppress diagnostics for instantiations. */; 3513 else if (ConvType->isRecordType()) { 3514 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3515 if (ConvType == ClassType) 3516 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3517 << ClassType; 3518 else if (IsDerivedFrom(ClassType, ConvType)) 3519 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3520 << ClassType << ConvType; 3521 } else if (ConvType->isVoidType()) { 3522 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3523 << ClassType << ConvType; 3524 } 3525 3526 if (FunctionTemplateDecl *ConversionTemplate 3527 = Conversion->getDescribedFunctionTemplate()) 3528 return ConversionTemplate; 3529 3530 return Conversion; 3531} 3532 3533//===----------------------------------------------------------------------===// 3534// Namespace Handling 3535//===----------------------------------------------------------------------===// 3536 3537 3538 3539/// ActOnStartNamespaceDef - This is called at the start of a namespace 3540/// definition. 3541Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3542 SourceLocation InlineLoc, 3543 SourceLocation IdentLoc, 3544 IdentifierInfo *II, 3545 SourceLocation LBrace, 3546 AttributeList *AttrList) { 3547 // anonymous namespace starts at its left brace 3548 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3549 (II ? IdentLoc : LBrace) , II); 3550 Namespc->setLBracLoc(LBrace); 3551 Namespc->setInline(InlineLoc.isValid()); 3552 3553 Scope *DeclRegionScope = NamespcScope->getParent(); 3554 3555 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3556 3557 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3558 PushNamespaceVisibilityAttr(Attr); 3559 3560 if (II) { 3561 // C++ [namespace.def]p2: 3562 // The identifier in an original-namespace-definition shall not 3563 // have been previously defined in the declarative region in 3564 // which the original-namespace-definition appears. The 3565 // identifier in an original-namespace-definition is the name of 3566 // the namespace. Subsequently in that declarative region, it is 3567 // treated as an original-namespace-name. 3568 // 3569 // Since namespace names are unique in their scope, and we don't 3570 // look through using directives, just 3571 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3572 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3573 3574 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3575 // This is an extended namespace definition. 3576 if (Namespc->isInline() != OrigNS->isInline()) { 3577 // inline-ness must match 3578 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3579 << Namespc->isInline(); 3580 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3581 Namespc->setInvalidDecl(); 3582 // Recover by ignoring the new namespace's inline status. 3583 Namespc->setInline(OrigNS->isInline()); 3584 } 3585 3586 // Attach this namespace decl to the chain of extended namespace 3587 // definitions. 3588 OrigNS->setNextNamespace(Namespc); 3589 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3590 3591 // Remove the previous declaration from the scope. 3592 if (DeclRegionScope->isDeclScope(OrigNS)) { 3593 IdResolver.RemoveDecl(OrigNS); 3594 DeclRegionScope->RemoveDecl(OrigNS); 3595 } 3596 } else if (PrevDecl) { 3597 // This is an invalid name redefinition. 3598 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3599 << Namespc->getDeclName(); 3600 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3601 Namespc->setInvalidDecl(); 3602 // Continue on to push Namespc as current DeclContext and return it. 3603 } else if (II->isStr("std") && 3604 CurContext->getRedeclContext()->isTranslationUnit()) { 3605 // This is the first "real" definition of the namespace "std", so update 3606 // our cache of the "std" namespace to point at this definition. 3607 if (NamespaceDecl *StdNS = getStdNamespace()) { 3608 // We had already defined a dummy namespace "std". Link this new 3609 // namespace definition to the dummy namespace "std". 3610 StdNS->setNextNamespace(Namespc); 3611 StdNS->setLocation(IdentLoc); 3612 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3613 } 3614 3615 // Make our StdNamespace cache point at the first real definition of the 3616 // "std" namespace. 3617 StdNamespace = Namespc; 3618 } 3619 3620 PushOnScopeChains(Namespc, DeclRegionScope); 3621 } else { 3622 // Anonymous namespaces. 3623 assert(Namespc->isAnonymousNamespace()); 3624 3625 // Link the anonymous namespace into its parent. 3626 NamespaceDecl *PrevDecl; 3627 DeclContext *Parent = CurContext->getRedeclContext(); 3628 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3629 PrevDecl = TU->getAnonymousNamespace(); 3630 TU->setAnonymousNamespace(Namespc); 3631 } else { 3632 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3633 PrevDecl = ND->getAnonymousNamespace(); 3634 ND->setAnonymousNamespace(Namespc); 3635 } 3636 3637 // Link the anonymous namespace with its previous declaration. 3638 if (PrevDecl) { 3639 assert(PrevDecl->isAnonymousNamespace()); 3640 assert(!PrevDecl->getNextNamespace()); 3641 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3642 PrevDecl->setNextNamespace(Namespc); 3643 3644 if (Namespc->isInline() != PrevDecl->isInline()) { 3645 // inline-ness must match 3646 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3647 << Namespc->isInline(); 3648 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3649 Namespc->setInvalidDecl(); 3650 // Recover by ignoring the new namespace's inline status. 3651 Namespc->setInline(PrevDecl->isInline()); 3652 } 3653 } 3654 3655 CurContext->addDecl(Namespc); 3656 3657 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3658 // behaves as if it were replaced by 3659 // namespace unique { /* empty body */ } 3660 // using namespace unique; 3661 // namespace unique { namespace-body } 3662 // where all occurrences of 'unique' in a translation unit are 3663 // replaced by the same identifier and this identifier differs 3664 // from all other identifiers in the entire program. 3665 3666 // We just create the namespace with an empty name and then add an 3667 // implicit using declaration, just like the standard suggests. 3668 // 3669 // CodeGen enforces the "universally unique" aspect by giving all 3670 // declarations semantically contained within an anonymous 3671 // namespace internal linkage. 3672 3673 if (!PrevDecl) { 3674 UsingDirectiveDecl* UD 3675 = UsingDirectiveDecl::Create(Context, CurContext, 3676 /* 'using' */ LBrace, 3677 /* 'namespace' */ SourceLocation(), 3678 /* qualifier */ NestedNameSpecifierLoc(), 3679 /* identifier */ SourceLocation(), 3680 Namespc, 3681 /* Ancestor */ CurContext); 3682 UD->setImplicit(); 3683 CurContext->addDecl(UD); 3684 } 3685 } 3686 3687 // Although we could have an invalid decl (i.e. the namespace name is a 3688 // redefinition), push it as current DeclContext and try to continue parsing. 3689 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3690 // for the namespace has the declarations that showed up in that particular 3691 // namespace definition. 3692 PushDeclContext(NamespcScope, Namespc); 3693 return Namespc; 3694} 3695 3696/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3697/// is a namespace alias, returns the namespace it points to. 3698static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3699 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3700 return AD->getNamespace(); 3701 return dyn_cast_or_null<NamespaceDecl>(D); 3702} 3703 3704/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3705/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3706void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3707 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3708 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3709 Namespc->setRBracLoc(RBrace); 3710 PopDeclContext(); 3711 if (Namespc->hasAttr<VisibilityAttr>()) 3712 PopPragmaVisibility(); 3713} 3714 3715CXXRecordDecl *Sema::getStdBadAlloc() const { 3716 return cast_or_null<CXXRecordDecl>( 3717 StdBadAlloc.get(Context.getExternalSource())); 3718} 3719 3720NamespaceDecl *Sema::getStdNamespace() const { 3721 return cast_or_null<NamespaceDecl>( 3722 StdNamespace.get(Context.getExternalSource())); 3723} 3724 3725/// \brief Retrieve the special "std" namespace, which may require us to 3726/// implicitly define the namespace. 3727NamespaceDecl *Sema::getOrCreateStdNamespace() { 3728 if (!StdNamespace) { 3729 // The "std" namespace has not yet been defined, so build one implicitly. 3730 StdNamespace = NamespaceDecl::Create(Context, 3731 Context.getTranslationUnitDecl(), 3732 SourceLocation(), 3733 &PP.getIdentifierTable().get("std")); 3734 getStdNamespace()->setImplicit(true); 3735 } 3736 3737 return getStdNamespace(); 3738} 3739 3740Decl *Sema::ActOnUsingDirective(Scope *S, 3741 SourceLocation UsingLoc, 3742 SourceLocation NamespcLoc, 3743 CXXScopeSpec &SS, 3744 SourceLocation IdentLoc, 3745 IdentifierInfo *NamespcName, 3746 AttributeList *AttrList) { 3747 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3748 assert(NamespcName && "Invalid NamespcName."); 3749 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3750 3751 // This can only happen along a recovery path. 3752 while (S->getFlags() & Scope::TemplateParamScope) 3753 S = S->getParent(); 3754 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3755 3756 UsingDirectiveDecl *UDir = 0; 3757 NestedNameSpecifier *Qualifier = 0; 3758 if (SS.isSet()) 3759 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3760 3761 // Lookup namespace name. 3762 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3763 LookupParsedName(R, S, &SS); 3764 if (R.isAmbiguous()) 3765 return 0; 3766 3767 if (R.empty()) { 3768 // Allow "using namespace std;" or "using namespace ::std;" even if 3769 // "std" hasn't been defined yet, for GCC compatibility. 3770 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3771 NamespcName->isStr("std")) { 3772 Diag(IdentLoc, diag::ext_using_undefined_std); 3773 R.addDecl(getOrCreateStdNamespace()); 3774 R.resolveKind(); 3775 } 3776 // Otherwise, attempt typo correction. 3777 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3778 CTC_NoKeywords, 0)) { 3779 if (R.getAsSingle<NamespaceDecl>() || 3780 R.getAsSingle<NamespaceAliasDecl>()) { 3781 if (DeclContext *DC = computeDeclContext(SS, false)) 3782 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3783 << NamespcName << DC << Corrected << SS.getRange() 3784 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3785 else 3786 Diag(IdentLoc, diag::err_using_directive_suggest) 3787 << NamespcName << Corrected 3788 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3789 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3790 << Corrected; 3791 3792 NamespcName = Corrected.getAsIdentifierInfo(); 3793 } else { 3794 R.clear(); 3795 R.setLookupName(NamespcName); 3796 } 3797 } 3798 } 3799 3800 if (!R.empty()) { 3801 NamedDecl *Named = R.getFoundDecl(); 3802 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3803 && "expected namespace decl"); 3804 // C++ [namespace.udir]p1: 3805 // A using-directive specifies that the names in the nominated 3806 // namespace can be used in the scope in which the 3807 // using-directive appears after the using-directive. During 3808 // unqualified name lookup (3.4.1), the names appear as if they 3809 // were declared in the nearest enclosing namespace which 3810 // contains both the using-directive and the nominated 3811 // namespace. [Note: in this context, "contains" means "contains 3812 // directly or indirectly". ] 3813 3814 // Find enclosing context containing both using-directive and 3815 // nominated namespace. 3816 NamespaceDecl *NS = getNamespaceDecl(Named); 3817 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3818 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3819 CommonAncestor = CommonAncestor->getParent(); 3820 3821 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3822 SS.getWithLocInContext(Context), 3823 IdentLoc, Named, CommonAncestor); 3824 PushUsingDirective(S, UDir); 3825 } else { 3826 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3827 } 3828 3829 // FIXME: We ignore attributes for now. 3830 return UDir; 3831} 3832 3833void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3834 // If scope has associated entity, then using directive is at namespace 3835 // or translation unit scope. We add UsingDirectiveDecls, into 3836 // it's lookup structure. 3837 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3838 Ctx->addDecl(UDir); 3839 else 3840 // Otherwise it is block-sope. using-directives will affect lookup 3841 // only to the end of scope. 3842 S->PushUsingDirective(UDir); 3843} 3844 3845 3846Decl *Sema::ActOnUsingDeclaration(Scope *S, 3847 AccessSpecifier AS, 3848 bool HasUsingKeyword, 3849 SourceLocation UsingLoc, 3850 CXXScopeSpec &SS, 3851 UnqualifiedId &Name, 3852 AttributeList *AttrList, 3853 bool IsTypeName, 3854 SourceLocation TypenameLoc) { 3855 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3856 3857 switch (Name.getKind()) { 3858 case UnqualifiedId::IK_Identifier: 3859 case UnqualifiedId::IK_OperatorFunctionId: 3860 case UnqualifiedId::IK_LiteralOperatorId: 3861 case UnqualifiedId::IK_ConversionFunctionId: 3862 break; 3863 3864 case UnqualifiedId::IK_ConstructorName: 3865 case UnqualifiedId::IK_ConstructorTemplateId: 3866 // C++0x inherited constructors. 3867 if (getLangOptions().CPlusPlus0x) break; 3868 3869 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3870 << SS.getRange(); 3871 return 0; 3872 3873 case UnqualifiedId::IK_DestructorName: 3874 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3875 << SS.getRange(); 3876 return 0; 3877 3878 case UnqualifiedId::IK_TemplateId: 3879 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3880 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3881 return 0; 3882 } 3883 3884 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3885 DeclarationName TargetName = TargetNameInfo.getName(); 3886 if (!TargetName) 3887 return 0; 3888 3889 // Warn about using declarations. 3890 // TODO: store that the declaration was written without 'using' and 3891 // talk about access decls instead of using decls in the 3892 // diagnostics. 3893 if (!HasUsingKeyword) { 3894 UsingLoc = Name.getSourceRange().getBegin(); 3895 3896 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3897 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3898 } 3899 3900 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3901 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3902 return 0; 3903 3904 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3905 TargetNameInfo, AttrList, 3906 /* IsInstantiation */ false, 3907 IsTypeName, TypenameLoc); 3908 if (UD) 3909 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3910 3911 return UD; 3912} 3913 3914/// \brief Determine whether a using declaration considers the given 3915/// declarations as "equivalent", e.g., if they are redeclarations of 3916/// the same entity or are both typedefs of the same type. 3917static bool 3918IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3919 bool &SuppressRedeclaration) { 3920 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3921 SuppressRedeclaration = false; 3922 return true; 3923 } 3924 3925 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3926 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3927 SuppressRedeclaration = true; 3928 return Context.hasSameType(TD1->getUnderlyingType(), 3929 TD2->getUnderlyingType()); 3930 } 3931 3932 return false; 3933} 3934 3935 3936/// Determines whether to create a using shadow decl for a particular 3937/// decl, given the set of decls existing prior to this using lookup. 3938bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3939 const LookupResult &Previous) { 3940 // Diagnose finding a decl which is not from a base class of the 3941 // current class. We do this now because there are cases where this 3942 // function will silently decide not to build a shadow decl, which 3943 // will pre-empt further diagnostics. 3944 // 3945 // We don't need to do this in C++0x because we do the check once on 3946 // the qualifier. 3947 // 3948 // FIXME: diagnose the following if we care enough: 3949 // struct A { int foo; }; 3950 // struct B : A { using A::foo; }; 3951 // template <class T> struct C : A {}; 3952 // template <class T> struct D : C<T> { using B::foo; } // <--- 3953 // This is invalid (during instantiation) in C++03 because B::foo 3954 // resolves to the using decl in B, which is not a base class of D<T>. 3955 // We can't diagnose it immediately because C<T> is an unknown 3956 // specialization. The UsingShadowDecl in D<T> then points directly 3957 // to A::foo, which will look well-formed when we instantiate. 3958 // The right solution is to not collapse the shadow-decl chain. 3959 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3960 DeclContext *OrigDC = Orig->getDeclContext(); 3961 3962 // Handle enums and anonymous structs. 3963 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3964 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3965 while (OrigRec->isAnonymousStructOrUnion()) 3966 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3967 3968 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3969 if (OrigDC == CurContext) { 3970 Diag(Using->getLocation(), 3971 diag::err_using_decl_nested_name_specifier_is_current_class) 3972 << Using->getQualifierLoc().getSourceRange(); 3973 Diag(Orig->getLocation(), diag::note_using_decl_target); 3974 return true; 3975 } 3976 3977 Diag(Using->getQualifierLoc().getBeginLoc(), 3978 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3979 << Using->getQualifier() 3980 << cast<CXXRecordDecl>(CurContext) 3981 << Using->getQualifierLoc().getSourceRange(); 3982 Diag(Orig->getLocation(), diag::note_using_decl_target); 3983 return true; 3984 } 3985 } 3986 3987 if (Previous.empty()) return false; 3988 3989 NamedDecl *Target = Orig; 3990 if (isa<UsingShadowDecl>(Target)) 3991 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3992 3993 // If the target happens to be one of the previous declarations, we 3994 // don't have a conflict. 3995 // 3996 // FIXME: but we might be increasing its access, in which case we 3997 // should redeclare it. 3998 NamedDecl *NonTag = 0, *Tag = 0; 3999 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4000 I != E; ++I) { 4001 NamedDecl *D = (*I)->getUnderlyingDecl(); 4002 bool Result; 4003 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4004 return Result; 4005 4006 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4007 } 4008 4009 if (Target->isFunctionOrFunctionTemplate()) { 4010 FunctionDecl *FD; 4011 if (isa<FunctionTemplateDecl>(Target)) 4012 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4013 else 4014 FD = cast<FunctionDecl>(Target); 4015 4016 NamedDecl *OldDecl = 0; 4017 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4018 case Ovl_Overload: 4019 return false; 4020 4021 case Ovl_NonFunction: 4022 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4023 break; 4024 4025 // We found a decl with the exact signature. 4026 case Ovl_Match: 4027 // If we're in a record, we want to hide the target, so we 4028 // return true (without a diagnostic) to tell the caller not to 4029 // build a shadow decl. 4030 if (CurContext->isRecord()) 4031 return true; 4032 4033 // If we're not in a record, this is an error. 4034 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4035 break; 4036 } 4037 4038 Diag(Target->getLocation(), diag::note_using_decl_target); 4039 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4040 return true; 4041 } 4042 4043 // Target is not a function. 4044 4045 if (isa<TagDecl>(Target)) { 4046 // No conflict between a tag and a non-tag. 4047 if (!Tag) return false; 4048 4049 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4050 Diag(Target->getLocation(), diag::note_using_decl_target); 4051 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4052 return true; 4053 } 4054 4055 // No conflict between a tag and a non-tag. 4056 if (!NonTag) return false; 4057 4058 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4059 Diag(Target->getLocation(), diag::note_using_decl_target); 4060 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4061 return true; 4062} 4063 4064/// Builds a shadow declaration corresponding to a 'using' declaration. 4065UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4066 UsingDecl *UD, 4067 NamedDecl *Orig) { 4068 4069 // If we resolved to another shadow declaration, just coalesce them. 4070 NamedDecl *Target = Orig; 4071 if (isa<UsingShadowDecl>(Target)) { 4072 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4073 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4074 } 4075 4076 UsingShadowDecl *Shadow 4077 = UsingShadowDecl::Create(Context, CurContext, 4078 UD->getLocation(), UD, Target); 4079 UD->addShadowDecl(Shadow); 4080 4081 Shadow->setAccess(UD->getAccess()); 4082 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4083 Shadow->setInvalidDecl(); 4084 4085 if (S) 4086 PushOnScopeChains(Shadow, S); 4087 else 4088 CurContext->addDecl(Shadow); 4089 4090 4091 return Shadow; 4092} 4093 4094/// Hides a using shadow declaration. This is required by the current 4095/// using-decl implementation when a resolvable using declaration in a 4096/// class is followed by a declaration which would hide or override 4097/// one or more of the using decl's targets; for example: 4098/// 4099/// struct Base { void foo(int); }; 4100/// struct Derived : Base { 4101/// using Base::foo; 4102/// void foo(int); 4103/// }; 4104/// 4105/// The governing language is C++03 [namespace.udecl]p12: 4106/// 4107/// When a using-declaration brings names from a base class into a 4108/// derived class scope, member functions in the derived class 4109/// override and/or hide member functions with the same name and 4110/// parameter types in a base class (rather than conflicting). 4111/// 4112/// There are two ways to implement this: 4113/// (1) optimistically create shadow decls when they're not hidden 4114/// by existing declarations, or 4115/// (2) don't create any shadow decls (or at least don't make them 4116/// visible) until we've fully parsed/instantiated the class. 4117/// The problem with (1) is that we might have to retroactively remove 4118/// a shadow decl, which requires several O(n) operations because the 4119/// decl structures are (very reasonably) not designed for removal. 4120/// (2) avoids this but is very fiddly and phase-dependent. 4121void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4122 if (Shadow->getDeclName().getNameKind() == 4123 DeclarationName::CXXConversionFunctionName) 4124 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4125 4126 // Remove it from the DeclContext... 4127 Shadow->getDeclContext()->removeDecl(Shadow); 4128 4129 // ...and the scope, if applicable... 4130 if (S) { 4131 S->RemoveDecl(Shadow); 4132 IdResolver.RemoveDecl(Shadow); 4133 } 4134 4135 // ...and the using decl. 4136 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4137 4138 // TODO: complain somehow if Shadow was used. It shouldn't 4139 // be possible for this to happen, because...? 4140} 4141 4142/// Builds a using declaration. 4143/// 4144/// \param IsInstantiation - Whether this call arises from an 4145/// instantiation of an unresolved using declaration. We treat 4146/// the lookup differently for these declarations. 4147NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4148 SourceLocation UsingLoc, 4149 CXXScopeSpec &SS, 4150 const DeclarationNameInfo &NameInfo, 4151 AttributeList *AttrList, 4152 bool IsInstantiation, 4153 bool IsTypeName, 4154 SourceLocation TypenameLoc) { 4155 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4156 SourceLocation IdentLoc = NameInfo.getLoc(); 4157 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4158 4159 // FIXME: We ignore attributes for now. 4160 4161 if (SS.isEmpty()) { 4162 Diag(IdentLoc, diag::err_using_requires_qualname); 4163 return 0; 4164 } 4165 4166 // Do the redeclaration lookup in the current scope. 4167 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4168 ForRedeclaration); 4169 Previous.setHideTags(false); 4170 if (S) { 4171 LookupName(Previous, S); 4172 4173 // It is really dumb that we have to do this. 4174 LookupResult::Filter F = Previous.makeFilter(); 4175 while (F.hasNext()) { 4176 NamedDecl *D = F.next(); 4177 if (!isDeclInScope(D, CurContext, S)) 4178 F.erase(); 4179 } 4180 F.done(); 4181 } else { 4182 assert(IsInstantiation && "no scope in non-instantiation"); 4183 assert(CurContext->isRecord() && "scope not record in instantiation"); 4184 LookupQualifiedName(Previous, CurContext); 4185 } 4186 4187 // Check for invalid redeclarations. 4188 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4189 return 0; 4190 4191 // Check for bad qualifiers. 4192 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4193 return 0; 4194 4195 DeclContext *LookupContext = computeDeclContext(SS); 4196 NamedDecl *D; 4197 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4198 if (!LookupContext) { 4199 if (IsTypeName) { 4200 // FIXME: not all declaration name kinds are legal here 4201 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4202 UsingLoc, TypenameLoc, 4203 QualifierLoc, 4204 IdentLoc, NameInfo.getName()); 4205 } else { 4206 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4207 QualifierLoc, NameInfo); 4208 } 4209 } else { 4210 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4211 NameInfo, IsTypeName); 4212 } 4213 D->setAccess(AS); 4214 CurContext->addDecl(D); 4215 4216 if (!LookupContext) return D; 4217 UsingDecl *UD = cast<UsingDecl>(D); 4218 4219 if (RequireCompleteDeclContext(SS, LookupContext)) { 4220 UD->setInvalidDecl(); 4221 return UD; 4222 } 4223 4224 // Constructor inheriting using decls get special treatment. 4225 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4226 if (CheckInheritedConstructorUsingDecl(UD)) 4227 UD->setInvalidDecl(); 4228 return UD; 4229 } 4230 4231 // Otherwise, look up the target name. 4232 4233 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4234 4235 // Unlike most lookups, we don't always want to hide tag 4236 // declarations: tag names are visible through the using declaration 4237 // even if hidden by ordinary names, *except* in a dependent context 4238 // where it's important for the sanity of two-phase lookup. 4239 if (!IsInstantiation) 4240 R.setHideTags(false); 4241 4242 LookupQualifiedName(R, LookupContext); 4243 4244 if (R.empty()) { 4245 Diag(IdentLoc, diag::err_no_member) 4246 << NameInfo.getName() << LookupContext << SS.getRange(); 4247 UD->setInvalidDecl(); 4248 return UD; 4249 } 4250 4251 if (R.isAmbiguous()) { 4252 UD->setInvalidDecl(); 4253 return UD; 4254 } 4255 4256 if (IsTypeName) { 4257 // If we asked for a typename and got a non-type decl, error out. 4258 if (!R.getAsSingle<TypeDecl>()) { 4259 Diag(IdentLoc, diag::err_using_typename_non_type); 4260 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4261 Diag((*I)->getUnderlyingDecl()->getLocation(), 4262 diag::note_using_decl_target); 4263 UD->setInvalidDecl(); 4264 return UD; 4265 } 4266 } else { 4267 // If we asked for a non-typename and we got a type, error out, 4268 // but only if this is an instantiation of an unresolved using 4269 // decl. Otherwise just silently find the type name. 4270 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4271 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4272 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4273 UD->setInvalidDecl(); 4274 return UD; 4275 } 4276 } 4277 4278 // C++0x N2914 [namespace.udecl]p6: 4279 // A using-declaration shall not name a namespace. 4280 if (R.getAsSingle<NamespaceDecl>()) { 4281 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4282 << SS.getRange(); 4283 UD->setInvalidDecl(); 4284 return UD; 4285 } 4286 4287 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4288 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4289 BuildUsingShadowDecl(S, UD, *I); 4290 } 4291 4292 return UD; 4293} 4294 4295/// Additional checks for a using declaration referring to a constructor name. 4296bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4297 if (UD->isTypeName()) { 4298 // FIXME: Cannot specify typename when specifying constructor 4299 return true; 4300 } 4301 4302 const Type *SourceType = UD->getQualifier()->getAsType(); 4303 assert(SourceType && 4304 "Using decl naming constructor doesn't have type in scope spec."); 4305 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4306 4307 // Check whether the named type is a direct base class. 4308 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4309 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4310 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4311 BaseIt != BaseE; ++BaseIt) { 4312 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4313 if (CanonicalSourceType == BaseType) 4314 break; 4315 } 4316 4317 if (BaseIt == BaseE) { 4318 // Did not find SourceType in the bases. 4319 Diag(UD->getUsingLocation(), 4320 diag::err_using_decl_constructor_not_in_direct_base) 4321 << UD->getNameInfo().getSourceRange() 4322 << QualType(SourceType, 0) << TargetClass; 4323 return true; 4324 } 4325 4326 BaseIt->setInheritConstructors(); 4327 4328 return false; 4329} 4330 4331/// Checks that the given using declaration is not an invalid 4332/// redeclaration. Note that this is checking only for the using decl 4333/// itself, not for any ill-formedness among the UsingShadowDecls. 4334bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4335 bool isTypeName, 4336 const CXXScopeSpec &SS, 4337 SourceLocation NameLoc, 4338 const LookupResult &Prev) { 4339 // C++03 [namespace.udecl]p8: 4340 // C++0x [namespace.udecl]p10: 4341 // A using-declaration is a declaration and can therefore be used 4342 // repeatedly where (and only where) multiple declarations are 4343 // allowed. 4344 // 4345 // That's in non-member contexts. 4346 if (!CurContext->getRedeclContext()->isRecord()) 4347 return false; 4348 4349 NestedNameSpecifier *Qual 4350 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4351 4352 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4353 NamedDecl *D = *I; 4354 4355 bool DTypename; 4356 NestedNameSpecifier *DQual; 4357 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4358 DTypename = UD->isTypeName(); 4359 DQual = UD->getQualifier(); 4360 } else if (UnresolvedUsingValueDecl *UD 4361 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4362 DTypename = false; 4363 DQual = UD->getQualifier(); 4364 } else if (UnresolvedUsingTypenameDecl *UD 4365 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4366 DTypename = true; 4367 DQual = UD->getQualifier(); 4368 } else continue; 4369 4370 // using decls differ if one says 'typename' and the other doesn't. 4371 // FIXME: non-dependent using decls? 4372 if (isTypeName != DTypename) continue; 4373 4374 // using decls differ if they name different scopes (but note that 4375 // template instantiation can cause this check to trigger when it 4376 // didn't before instantiation). 4377 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4378 Context.getCanonicalNestedNameSpecifier(DQual)) 4379 continue; 4380 4381 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4382 Diag(D->getLocation(), diag::note_using_decl) << 1; 4383 return true; 4384 } 4385 4386 return false; 4387} 4388 4389 4390/// Checks that the given nested-name qualifier used in a using decl 4391/// in the current context is appropriately related to the current 4392/// scope. If an error is found, diagnoses it and returns true. 4393bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4394 const CXXScopeSpec &SS, 4395 SourceLocation NameLoc) { 4396 DeclContext *NamedContext = computeDeclContext(SS); 4397 4398 if (!CurContext->isRecord()) { 4399 // C++03 [namespace.udecl]p3: 4400 // C++0x [namespace.udecl]p8: 4401 // A using-declaration for a class member shall be a member-declaration. 4402 4403 // If we weren't able to compute a valid scope, it must be a 4404 // dependent class scope. 4405 if (!NamedContext || NamedContext->isRecord()) { 4406 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4407 << SS.getRange(); 4408 return true; 4409 } 4410 4411 // Otherwise, everything is known to be fine. 4412 return false; 4413 } 4414 4415 // The current scope is a record. 4416 4417 // If the named context is dependent, we can't decide much. 4418 if (!NamedContext) { 4419 // FIXME: in C++0x, we can diagnose if we can prove that the 4420 // nested-name-specifier does not refer to a base class, which is 4421 // still possible in some cases. 4422 4423 // Otherwise we have to conservatively report that things might be 4424 // okay. 4425 return false; 4426 } 4427 4428 if (!NamedContext->isRecord()) { 4429 // Ideally this would point at the last name in the specifier, 4430 // but we don't have that level of source info. 4431 Diag(SS.getRange().getBegin(), 4432 diag::err_using_decl_nested_name_specifier_is_not_class) 4433 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4434 return true; 4435 } 4436 4437 if (!NamedContext->isDependentContext() && 4438 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4439 return true; 4440 4441 if (getLangOptions().CPlusPlus0x) { 4442 // C++0x [namespace.udecl]p3: 4443 // In a using-declaration used as a member-declaration, the 4444 // nested-name-specifier shall name a base class of the class 4445 // being defined. 4446 4447 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4448 cast<CXXRecordDecl>(NamedContext))) { 4449 if (CurContext == NamedContext) { 4450 Diag(NameLoc, 4451 diag::err_using_decl_nested_name_specifier_is_current_class) 4452 << SS.getRange(); 4453 return true; 4454 } 4455 4456 Diag(SS.getRange().getBegin(), 4457 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4458 << (NestedNameSpecifier*) SS.getScopeRep() 4459 << cast<CXXRecordDecl>(CurContext) 4460 << SS.getRange(); 4461 return true; 4462 } 4463 4464 return false; 4465 } 4466 4467 // C++03 [namespace.udecl]p4: 4468 // A using-declaration used as a member-declaration shall refer 4469 // to a member of a base class of the class being defined [etc.]. 4470 4471 // Salient point: SS doesn't have to name a base class as long as 4472 // lookup only finds members from base classes. Therefore we can 4473 // diagnose here only if we can prove that that can't happen, 4474 // i.e. if the class hierarchies provably don't intersect. 4475 4476 // TODO: it would be nice if "definitely valid" results were cached 4477 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4478 // need to be repeated. 4479 4480 struct UserData { 4481 llvm::DenseSet<const CXXRecordDecl*> Bases; 4482 4483 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4484 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4485 Data->Bases.insert(Base); 4486 return true; 4487 } 4488 4489 bool hasDependentBases(const CXXRecordDecl *Class) { 4490 return !Class->forallBases(collect, this); 4491 } 4492 4493 /// Returns true if the base is dependent or is one of the 4494 /// accumulated base classes. 4495 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4496 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4497 return !Data->Bases.count(Base); 4498 } 4499 4500 bool mightShareBases(const CXXRecordDecl *Class) { 4501 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4502 } 4503 }; 4504 4505 UserData Data; 4506 4507 // Returns false if we find a dependent base. 4508 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4509 return false; 4510 4511 // Returns false if the class has a dependent base or if it or one 4512 // of its bases is present in the base set of the current context. 4513 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4514 return false; 4515 4516 Diag(SS.getRange().getBegin(), 4517 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4518 << (NestedNameSpecifier*) SS.getScopeRep() 4519 << cast<CXXRecordDecl>(CurContext) 4520 << SS.getRange(); 4521 4522 return true; 4523} 4524 4525Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4526 SourceLocation NamespaceLoc, 4527 SourceLocation AliasLoc, 4528 IdentifierInfo *Alias, 4529 CXXScopeSpec &SS, 4530 SourceLocation IdentLoc, 4531 IdentifierInfo *Ident) { 4532 4533 // Lookup the namespace name. 4534 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4535 LookupParsedName(R, S, &SS); 4536 4537 // Check if we have a previous declaration with the same name. 4538 NamedDecl *PrevDecl 4539 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4540 ForRedeclaration); 4541 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4542 PrevDecl = 0; 4543 4544 if (PrevDecl) { 4545 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4546 // We already have an alias with the same name that points to the same 4547 // namespace, so don't create a new one. 4548 // FIXME: At some point, we'll want to create the (redundant) 4549 // declaration to maintain better source information. 4550 if (!R.isAmbiguous() && !R.empty() && 4551 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4552 return 0; 4553 } 4554 4555 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4556 diag::err_redefinition_different_kind; 4557 Diag(AliasLoc, DiagID) << Alias; 4558 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4559 return 0; 4560 } 4561 4562 if (R.isAmbiguous()) 4563 return 0; 4564 4565 if (R.empty()) { 4566 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4567 CTC_NoKeywords, 0)) { 4568 if (R.getAsSingle<NamespaceDecl>() || 4569 R.getAsSingle<NamespaceAliasDecl>()) { 4570 if (DeclContext *DC = computeDeclContext(SS, false)) 4571 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4572 << Ident << DC << Corrected << SS.getRange() 4573 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4574 else 4575 Diag(IdentLoc, diag::err_using_directive_suggest) 4576 << Ident << Corrected 4577 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4578 4579 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4580 << Corrected; 4581 4582 Ident = Corrected.getAsIdentifierInfo(); 4583 } else { 4584 R.clear(); 4585 R.setLookupName(Ident); 4586 } 4587 } 4588 4589 if (R.empty()) { 4590 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4591 return 0; 4592 } 4593 } 4594 4595 NamespaceAliasDecl *AliasDecl = 4596 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4597 Alias, SS.getWithLocInContext(Context), 4598 IdentLoc, R.getFoundDecl()); 4599 4600 PushOnScopeChains(AliasDecl, S); 4601 return AliasDecl; 4602} 4603 4604namespace { 4605 /// \brief Scoped object used to handle the state changes required in Sema 4606 /// to implicitly define the body of a C++ member function; 4607 class ImplicitlyDefinedFunctionScope { 4608 Sema &S; 4609 Sema::ContextRAII SavedContext; 4610 4611 public: 4612 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4613 : S(S), SavedContext(S, Method) 4614 { 4615 S.PushFunctionScope(); 4616 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4617 } 4618 4619 ~ImplicitlyDefinedFunctionScope() { 4620 S.PopExpressionEvaluationContext(); 4621 S.PopFunctionOrBlockScope(); 4622 } 4623 }; 4624} 4625 4626static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4627 CXXRecordDecl *D) { 4628 ASTContext &Context = Self.Context; 4629 QualType ClassType = Context.getTypeDeclType(D); 4630 DeclarationName ConstructorName 4631 = Context.DeclarationNames.getCXXConstructorName( 4632 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4633 4634 DeclContext::lookup_const_iterator Con, ConEnd; 4635 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4636 Con != ConEnd; ++Con) { 4637 // FIXME: In C++0x, a constructor template can be a default constructor. 4638 if (isa<FunctionTemplateDecl>(*Con)) 4639 continue; 4640 4641 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4642 if (Constructor->isDefaultConstructor()) 4643 return Constructor; 4644 } 4645 return 0; 4646} 4647 4648CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4649 CXXRecordDecl *ClassDecl) { 4650 // C++ [class.ctor]p5: 4651 // A default constructor for a class X is a constructor of class X 4652 // that can be called without an argument. If there is no 4653 // user-declared constructor for class X, a default constructor is 4654 // implicitly declared. An implicitly-declared default constructor 4655 // is an inline public member of its class. 4656 assert(!ClassDecl->hasUserDeclaredConstructor() && 4657 "Should not build implicit default constructor!"); 4658 4659 // C++ [except.spec]p14: 4660 // An implicitly declared special member function (Clause 12) shall have an 4661 // exception-specification. [...] 4662 ImplicitExceptionSpecification ExceptSpec(Context); 4663 4664 // Direct base-class destructors. 4665 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4666 BEnd = ClassDecl->bases_end(); 4667 B != BEnd; ++B) { 4668 if (B->isVirtual()) // Handled below. 4669 continue; 4670 4671 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4672 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4673 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4674 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4675 else if (CXXConstructorDecl *Constructor 4676 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4677 ExceptSpec.CalledDecl(Constructor); 4678 } 4679 } 4680 4681 // Virtual base-class destructors. 4682 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4683 BEnd = ClassDecl->vbases_end(); 4684 B != BEnd; ++B) { 4685 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4686 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4687 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4688 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4689 else if (CXXConstructorDecl *Constructor 4690 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4691 ExceptSpec.CalledDecl(Constructor); 4692 } 4693 } 4694 4695 // Field destructors. 4696 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4697 FEnd = ClassDecl->field_end(); 4698 F != FEnd; ++F) { 4699 if (const RecordType *RecordTy 4700 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4701 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4702 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4703 ExceptSpec.CalledDecl( 4704 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4705 else if (CXXConstructorDecl *Constructor 4706 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4707 ExceptSpec.CalledDecl(Constructor); 4708 } 4709 } 4710 4711 FunctionProtoType::ExtProtoInfo EPI; 4712 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4713 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4714 EPI.NumExceptions = ExceptSpec.size(); 4715 EPI.Exceptions = ExceptSpec.data(); 4716 4717 // Create the actual constructor declaration. 4718 CanQualType ClassType 4719 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4720 DeclarationName Name 4721 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4722 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4723 CXXConstructorDecl *DefaultCon 4724 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4725 Context.getFunctionType(Context.VoidTy, 4726 0, 0, EPI), 4727 /*TInfo=*/0, 4728 /*isExplicit=*/false, 4729 /*isInline=*/true, 4730 /*isImplicitlyDeclared=*/true); 4731 DefaultCon->setAccess(AS_public); 4732 DefaultCon->setImplicit(); 4733 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4734 4735 // Note that we have declared this constructor. 4736 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4737 4738 if (Scope *S = getScopeForContext(ClassDecl)) 4739 PushOnScopeChains(DefaultCon, S, false); 4740 ClassDecl->addDecl(DefaultCon); 4741 4742 return DefaultCon; 4743} 4744 4745void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4746 CXXConstructorDecl *Constructor) { 4747 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4748 !Constructor->isUsed(false)) && 4749 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4750 4751 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4752 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4753 4754 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4755 DiagnosticErrorTrap Trap(Diags); 4756 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4757 Trap.hasErrorOccurred()) { 4758 Diag(CurrentLocation, diag::note_member_synthesized_at) 4759 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4760 Constructor->setInvalidDecl(); 4761 return; 4762 } 4763 4764 SourceLocation Loc = Constructor->getLocation(); 4765 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4766 4767 Constructor->setUsed(); 4768 MarkVTableUsed(CurrentLocation, ClassDecl); 4769} 4770 4771void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4772 // We start with an initial pass over the base classes to collect those that 4773 // inherit constructors from. If there are none, we can forgo all further 4774 // processing. 4775 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4776 BasesVector BasesToInheritFrom; 4777 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4778 BaseE = ClassDecl->bases_end(); 4779 BaseIt != BaseE; ++BaseIt) { 4780 if (BaseIt->getInheritConstructors()) { 4781 QualType Base = BaseIt->getType(); 4782 if (Base->isDependentType()) { 4783 // If we inherit constructors from anything that is dependent, just 4784 // abort processing altogether. We'll get another chance for the 4785 // instantiations. 4786 return; 4787 } 4788 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4789 } 4790 } 4791 if (BasesToInheritFrom.empty()) 4792 return; 4793 4794 // Now collect the constructors that we already have in the current class. 4795 // Those take precedence over inherited constructors. 4796 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4797 // unless there is a user-declared constructor with the same signature in 4798 // the class where the using-declaration appears. 4799 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4800 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4801 CtorE = ClassDecl->ctor_end(); 4802 CtorIt != CtorE; ++CtorIt) { 4803 ExistingConstructors.insert( 4804 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4805 } 4806 4807 Scope *S = getScopeForContext(ClassDecl); 4808 DeclarationName CreatedCtorName = 4809 Context.DeclarationNames.getCXXConstructorName( 4810 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4811 4812 // Now comes the true work. 4813 // First, we keep a map from constructor types to the base that introduced 4814 // them. Needed for finding conflicting constructors. We also keep the 4815 // actually inserted declarations in there, for pretty diagnostics. 4816 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4817 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4818 ConstructorToSourceMap InheritedConstructors; 4819 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4820 BaseE = BasesToInheritFrom.end(); 4821 BaseIt != BaseE; ++BaseIt) { 4822 const RecordType *Base = *BaseIt; 4823 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4824 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4825 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4826 CtorE = BaseDecl->ctor_end(); 4827 CtorIt != CtorE; ++CtorIt) { 4828 // Find the using declaration for inheriting this base's constructors. 4829 DeclarationName Name = 4830 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4831 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4832 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4833 SourceLocation UsingLoc = UD ? UD->getLocation() : 4834 ClassDecl->getLocation(); 4835 4836 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4837 // from the class X named in the using-declaration consists of actual 4838 // constructors and notional constructors that result from the 4839 // transformation of defaulted parameters as follows: 4840 // - all non-template default constructors of X, and 4841 // - for each non-template constructor of X that has at least one 4842 // parameter with a default argument, the set of constructors that 4843 // results from omitting any ellipsis parameter specification and 4844 // successively omitting parameters with a default argument from the 4845 // end of the parameter-type-list. 4846 CXXConstructorDecl *BaseCtor = *CtorIt; 4847 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4848 const FunctionProtoType *BaseCtorType = 4849 BaseCtor->getType()->getAs<FunctionProtoType>(); 4850 4851 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4852 maxParams = BaseCtor->getNumParams(); 4853 params <= maxParams; ++params) { 4854 // Skip default constructors. They're never inherited. 4855 if (params == 0) 4856 continue; 4857 // Skip copy and move constructors for the same reason. 4858 if (CanBeCopyOrMove && params == 1) 4859 continue; 4860 4861 // Build up a function type for this particular constructor. 4862 // FIXME: The working paper does not consider that the exception spec 4863 // for the inheriting constructor might be larger than that of the 4864 // source. This code doesn't yet, either. 4865 const Type *NewCtorType; 4866 if (params == maxParams) 4867 NewCtorType = BaseCtorType; 4868 else { 4869 llvm::SmallVector<QualType, 16> Args; 4870 for (unsigned i = 0; i < params; ++i) { 4871 Args.push_back(BaseCtorType->getArgType(i)); 4872 } 4873 FunctionProtoType::ExtProtoInfo ExtInfo = 4874 BaseCtorType->getExtProtoInfo(); 4875 ExtInfo.Variadic = false; 4876 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4877 Args.data(), params, ExtInfo) 4878 .getTypePtr(); 4879 } 4880 const Type *CanonicalNewCtorType = 4881 Context.getCanonicalType(NewCtorType); 4882 4883 // Now that we have the type, first check if the class already has a 4884 // constructor with this signature. 4885 if (ExistingConstructors.count(CanonicalNewCtorType)) 4886 continue; 4887 4888 // Then we check if we have already declared an inherited constructor 4889 // with this signature. 4890 std::pair<ConstructorToSourceMap::iterator, bool> result = 4891 InheritedConstructors.insert(std::make_pair( 4892 CanonicalNewCtorType, 4893 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4894 if (!result.second) { 4895 // Already in the map. If it came from a different class, that's an 4896 // error. Not if it's from the same. 4897 CanQualType PreviousBase = result.first->second.first; 4898 if (CanonicalBase != PreviousBase) { 4899 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4900 const CXXConstructorDecl *PrevBaseCtor = 4901 PrevCtor->getInheritedConstructor(); 4902 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4903 4904 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4905 Diag(BaseCtor->getLocation(), 4906 diag::note_using_decl_constructor_conflict_current_ctor); 4907 Diag(PrevBaseCtor->getLocation(), 4908 diag::note_using_decl_constructor_conflict_previous_ctor); 4909 Diag(PrevCtor->getLocation(), 4910 diag::note_using_decl_constructor_conflict_previous_using); 4911 } 4912 continue; 4913 } 4914 4915 // OK, we're there, now add the constructor. 4916 // C++0x [class.inhctor]p8: [...] that would be performed by a 4917 // user-writtern inline constructor [...] 4918 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4919 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4920 Context, ClassDecl, DNI, QualType(NewCtorType, 0), /*TInfo=*/0, 4921 BaseCtor->isExplicit(), /*Inline=*/true, 4922 /*ImplicitlyDeclared=*/true); 4923 NewCtor->setAccess(BaseCtor->getAccess()); 4924 4925 // Build up the parameter decls and add them. 4926 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4927 for (unsigned i = 0; i < params; ++i) { 4928 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, UsingLoc, 4929 /*IdentifierInfo=*/0, 4930 BaseCtorType->getArgType(i), 4931 /*TInfo=*/0, SC_None, 4932 SC_None, /*DefaultArg=*/0)); 4933 } 4934 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4935 NewCtor->setInheritedConstructor(BaseCtor); 4936 4937 PushOnScopeChains(NewCtor, S, false); 4938 ClassDecl->addDecl(NewCtor); 4939 result.first->second.second = NewCtor; 4940 } 4941 } 4942 } 4943} 4944 4945CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4946 // C++ [class.dtor]p2: 4947 // If a class has no user-declared destructor, a destructor is 4948 // declared implicitly. An implicitly-declared destructor is an 4949 // inline public member of its class. 4950 4951 // C++ [except.spec]p14: 4952 // An implicitly declared special member function (Clause 12) shall have 4953 // an exception-specification. 4954 ImplicitExceptionSpecification ExceptSpec(Context); 4955 4956 // Direct base-class destructors. 4957 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4958 BEnd = ClassDecl->bases_end(); 4959 B != BEnd; ++B) { 4960 if (B->isVirtual()) // Handled below. 4961 continue; 4962 4963 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4964 ExceptSpec.CalledDecl( 4965 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4966 } 4967 4968 // Virtual base-class destructors. 4969 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4970 BEnd = ClassDecl->vbases_end(); 4971 B != BEnd; ++B) { 4972 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4973 ExceptSpec.CalledDecl( 4974 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4975 } 4976 4977 // Field destructors. 4978 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4979 FEnd = ClassDecl->field_end(); 4980 F != FEnd; ++F) { 4981 if (const RecordType *RecordTy 4982 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4983 ExceptSpec.CalledDecl( 4984 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4985 } 4986 4987 // Create the actual destructor declaration. 4988 FunctionProtoType::ExtProtoInfo EPI; 4989 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4990 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4991 EPI.NumExceptions = ExceptSpec.size(); 4992 EPI.Exceptions = ExceptSpec.data(); 4993 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4994 4995 CanQualType ClassType 4996 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4997 DeclarationName Name 4998 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4999 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5000 CXXDestructorDecl *Destructor 5001 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 5002 /*isInline=*/true, 5003 /*isImplicitlyDeclared=*/true); 5004 Destructor->setAccess(AS_public); 5005 Destructor->setImplicit(); 5006 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5007 5008 // Note that we have declared this destructor. 5009 ++ASTContext::NumImplicitDestructorsDeclared; 5010 5011 // Introduce this destructor into its scope. 5012 if (Scope *S = getScopeForContext(ClassDecl)) 5013 PushOnScopeChains(Destructor, S, false); 5014 ClassDecl->addDecl(Destructor); 5015 5016 // This could be uniqued if it ever proves significant. 5017 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5018 5019 AddOverriddenMethods(ClassDecl, Destructor); 5020 5021 return Destructor; 5022} 5023 5024void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5025 CXXDestructorDecl *Destructor) { 5026 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5027 "DefineImplicitDestructor - call it for implicit default dtor"); 5028 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5029 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5030 5031 if (Destructor->isInvalidDecl()) 5032 return; 5033 5034 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5035 5036 DiagnosticErrorTrap Trap(Diags); 5037 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5038 Destructor->getParent()); 5039 5040 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5041 Diag(CurrentLocation, diag::note_member_synthesized_at) 5042 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5043 5044 Destructor->setInvalidDecl(); 5045 return; 5046 } 5047 5048 SourceLocation Loc = Destructor->getLocation(); 5049 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5050 5051 Destructor->setUsed(); 5052 MarkVTableUsed(CurrentLocation, ClassDecl); 5053} 5054 5055/// \brief Builds a statement that copies the given entity from \p From to 5056/// \c To. 5057/// 5058/// This routine is used to copy the members of a class with an 5059/// implicitly-declared copy assignment operator. When the entities being 5060/// copied are arrays, this routine builds for loops to copy them. 5061/// 5062/// \param S The Sema object used for type-checking. 5063/// 5064/// \param Loc The location where the implicit copy is being generated. 5065/// 5066/// \param T The type of the expressions being copied. Both expressions must 5067/// have this type. 5068/// 5069/// \param To The expression we are copying to. 5070/// 5071/// \param From The expression we are copying from. 5072/// 5073/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5074/// Otherwise, it's a non-static member subobject. 5075/// 5076/// \param Depth Internal parameter recording the depth of the recursion. 5077/// 5078/// \returns A statement or a loop that copies the expressions. 5079static StmtResult 5080BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5081 Expr *To, Expr *From, 5082 bool CopyingBaseSubobject, unsigned Depth = 0) { 5083 // C++0x [class.copy]p30: 5084 // Each subobject is assigned in the manner appropriate to its type: 5085 // 5086 // - if the subobject is of class type, the copy assignment operator 5087 // for the class is used (as if by explicit qualification; that is, 5088 // ignoring any possible virtual overriding functions in more derived 5089 // classes); 5090 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5091 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5092 5093 // Look for operator=. 5094 DeclarationName Name 5095 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5096 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5097 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5098 5099 // Filter out any result that isn't a copy-assignment operator. 5100 LookupResult::Filter F = OpLookup.makeFilter(); 5101 while (F.hasNext()) { 5102 NamedDecl *D = F.next(); 5103 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5104 if (Method->isCopyAssignmentOperator()) 5105 continue; 5106 5107 F.erase(); 5108 } 5109 F.done(); 5110 5111 // Suppress the protected check (C++ [class.protected]) for each of the 5112 // assignment operators we found. This strange dance is required when 5113 // we're assigning via a base classes's copy-assignment operator. To 5114 // ensure that we're getting the right base class subobject (without 5115 // ambiguities), we need to cast "this" to that subobject type; to 5116 // ensure that we don't go through the virtual call mechanism, we need 5117 // to qualify the operator= name with the base class (see below). However, 5118 // this means that if the base class has a protected copy assignment 5119 // operator, the protected member access check will fail. So, we 5120 // rewrite "protected" access to "public" access in this case, since we 5121 // know by construction that we're calling from a derived class. 5122 if (CopyingBaseSubobject) { 5123 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5124 L != LEnd; ++L) { 5125 if (L.getAccess() == AS_protected) 5126 L.setAccess(AS_public); 5127 } 5128 } 5129 5130 // Create the nested-name-specifier that will be used to qualify the 5131 // reference to operator=; this is required to suppress the virtual 5132 // call mechanism. 5133 CXXScopeSpec SS; 5134 SS.MakeTrivial(S.Context, 5135 NestedNameSpecifier::Create(S.Context, 0, false, 5136 T.getTypePtr()), 5137 Loc); 5138 5139 // Create the reference to operator=. 5140 ExprResult OpEqualRef 5141 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5142 /*FirstQualifierInScope=*/0, OpLookup, 5143 /*TemplateArgs=*/0, 5144 /*SuppressQualifierCheck=*/true); 5145 if (OpEqualRef.isInvalid()) 5146 return StmtError(); 5147 5148 // Build the call to the assignment operator. 5149 5150 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5151 OpEqualRef.takeAs<Expr>(), 5152 Loc, &From, 1, Loc); 5153 if (Call.isInvalid()) 5154 return StmtError(); 5155 5156 return S.Owned(Call.takeAs<Stmt>()); 5157 } 5158 5159 // - if the subobject is of scalar type, the built-in assignment 5160 // operator is used. 5161 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5162 if (!ArrayTy) { 5163 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5164 if (Assignment.isInvalid()) 5165 return StmtError(); 5166 5167 return S.Owned(Assignment.takeAs<Stmt>()); 5168 } 5169 5170 // - if the subobject is an array, each element is assigned, in the 5171 // manner appropriate to the element type; 5172 5173 // Construct a loop over the array bounds, e.g., 5174 // 5175 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5176 // 5177 // that will copy each of the array elements. 5178 QualType SizeType = S.Context.getSizeType(); 5179 5180 // Create the iteration variable. 5181 IdentifierInfo *IterationVarName = 0; 5182 { 5183 llvm::SmallString<8> Str; 5184 llvm::raw_svector_ostream OS(Str); 5185 OS << "__i" << Depth; 5186 IterationVarName = &S.Context.Idents.get(OS.str()); 5187 } 5188 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 5189 IterationVarName, SizeType, 5190 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5191 SC_None, SC_None); 5192 5193 // Initialize the iteration variable to zero. 5194 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5195 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5196 5197 // Create a reference to the iteration variable; we'll use this several 5198 // times throughout. 5199 Expr *IterationVarRef 5200 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5201 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5202 5203 // Create the DeclStmt that holds the iteration variable. 5204 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5205 5206 // Create the comparison against the array bound. 5207 llvm::APInt Upper 5208 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5209 Expr *Comparison 5210 = new (S.Context) BinaryOperator(IterationVarRef, 5211 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5212 BO_NE, S.Context.BoolTy, 5213 VK_RValue, OK_Ordinary, Loc); 5214 5215 // Create the pre-increment of the iteration variable. 5216 Expr *Increment 5217 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5218 VK_LValue, OK_Ordinary, Loc); 5219 5220 // Subscript the "from" and "to" expressions with the iteration variable. 5221 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5222 IterationVarRef, Loc)); 5223 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5224 IterationVarRef, Loc)); 5225 5226 // Build the copy for an individual element of the array. 5227 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5228 To, From, CopyingBaseSubobject, 5229 Depth + 1); 5230 if (Copy.isInvalid()) 5231 return StmtError(); 5232 5233 // Construct the loop that copies all elements of this array. 5234 return S.ActOnForStmt(Loc, Loc, InitStmt, 5235 S.MakeFullExpr(Comparison), 5236 0, S.MakeFullExpr(Increment), 5237 Loc, Copy.take()); 5238} 5239 5240/// \brief Determine whether the given class has a copy assignment operator 5241/// that accepts a const-qualified argument. 5242static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5243 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5244 5245 if (!Class->hasDeclaredCopyAssignment()) 5246 S.DeclareImplicitCopyAssignment(Class); 5247 5248 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5249 DeclarationName OpName 5250 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5251 5252 DeclContext::lookup_const_iterator Op, OpEnd; 5253 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5254 // C++ [class.copy]p9: 5255 // A user-declared copy assignment operator is a non-static non-template 5256 // member function of class X with exactly one parameter of type X, X&, 5257 // const X&, volatile X& or const volatile X&. 5258 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5259 if (!Method) 5260 continue; 5261 5262 if (Method->isStatic()) 5263 continue; 5264 if (Method->getPrimaryTemplate()) 5265 continue; 5266 const FunctionProtoType *FnType = 5267 Method->getType()->getAs<FunctionProtoType>(); 5268 assert(FnType && "Overloaded operator has no prototype."); 5269 // Don't assert on this; an invalid decl might have been left in the AST. 5270 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5271 continue; 5272 bool AcceptsConst = true; 5273 QualType ArgType = FnType->getArgType(0); 5274 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5275 ArgType = Ref->getPointeeType(); 5276 // Is it a non-const lvalue reference? 5277 if (!ArgType.isConstQualified()) 5278 AcceptsConst = false; 5279 } 5280 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5281 continue; 5282 5283 // We have a single argument of type cv X or cv X&, i.e. we've found the 5284 // copy assignment operator. Return whether it accepts const arguments. 5285 return AcceptsConst; 5286 } 5287 assert(Class->isInvalidDecl() && 5288 "No copy assignment operator declared in valid code."); 5289 return false; 5290} 5291 5292CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5293 // Note: The following rules are largely analoguous to the copy 5294 // constructor rules. Note that virtual bases are not taken into account 5295 // for determining the argument type of the operator. Note also that 5296 // operators taking an object instead of a reference are allowed. 5297 5298 5299 // C++ [class.copy]p10: 5300 // If the class definition does not explicitly declare a copy 5301 // assignment operator, one is declared implicitly. 5302 // The implicitly-defined copy assignment operator for a class X 5303 // will have the form 5304 // 5305 // X& X::operator=(const X&) 5306 // 5307 // if 5308 bool HasConstCopyAssignment = true; 5309 5310 // -- each direct base class B of X has a copy assignment operator 5311 // whose parameter is of type const B&, const volatile B& or B, 5312 // and 5313 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5314 BaseEnd = ClassDecl->bases_end(); 5315 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5316 assert(!Base->getType()->isDependentType() && 5317 "Cannot generate implicit members for class with dependent bases."); 5318 const CXXRecordDecl *BaseClassDecl 5319 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5320 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5321 } 5322 5323 // -- for all the nonstatic data members of X that are of a class 5324 // type M (or array thereof), each such class type has a copy 5325 // assignment operator whose parameter is of type const M&, 5326 // const volatile M& or M. 5327 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5328 FieldEnd = ClassDecl->field_end(); 5329 HasConstCopyAssignment && Field != FieldEnd; 5330 ++Field) { 5331 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5332 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5333 const CXXRecordDecl *FieldClassDecl 5334 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5335 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5336 } 5337 } 5338 5339 // Otherwise, the implicitly declared copy assignment operator will 5340 // have the form 5341 // 5342 // X& X::operator=(X&) 5343 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5344 QualType RetType = Context.getLValueReferenceType(ArgType); 5345 if (HasConstCopyAssignment) 5346 ArgType = ArgType.withConst(); 5347 ArgType = Context.getLValueReferenceType(ArgType); 5348 5349 // C++ [except.spec]p14: 5350 // An implicitly declared special member function (Clause 12) shall have an 5351 // exception-specification. [...] 5352 ImplicitExceptionSpecification ExceptSpec(Context); 5353 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5354 BaseEnd = ClassDecl->bases_end(); 5355 Base != BaseEnd; ++Base) { 5356 CXXRecordDecl *BaseClassDecl 5357 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5358 5359 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5360 DeclareImplicitCopyAssignment(BaseClassDecl); 5361 5362 if (CXXMethodDecl *CopyAssign 5363 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5364 ExceptSpec.CalledDecl(CopyAssign); 5365 } 5366 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5367 FieldEnd = ClassDecl->field_end(); 5368 Field != FieldEnd; 5369 ++Field) { 5370 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5371 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5372 CXXRecordDecl *FieldClassDecl 5373 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5374 5375 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5376 DeclareImplicitCopyAssignment(FieldClassDecl); 5377 5378 if (CXXMethodDecl *CopyAssign 5379 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5380 ExceptSpec.CalledDecl(CopyAssign); 5381 } 5382 } 5383 5384 // An implicitly-declared copy assignment operator is an inline public 5385 // member of its class. 5386 FunctionProtoType::ExtProtoInfo EPI; 5387 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5388 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5389 EPI.NumExceptions = ExceptSpec.size(); 5390 EPI.Exceptions = ExceptSpec.data(); 5391 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5392 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5393 CXXMethodDecl *CopyAssignment 5394 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5395 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5396 /*TInfo=*/0, /*isStatic=*/false, 5397 /*StorageClassAsWritten=*/SC_None, 5398 /*isInline=*/true); 5399 CopyAssignment->setAccess(AS_public); 5400 CopyAssignment->setImplicit(); 5401 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5402 5403 // Add the parameter to the operator. 5404 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5405 ClassDecl->getLocation(), 5406 /*Id=*/0, 5407 ArgType, /*TInfo=*/0, 5408 SC_None, 5409 SC_None, 0); 5410 CopyAssignment->setParams(&FromParam, 1); 5411 5412 // Note that we have added this copy-assignment operator. 5413 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5414 5415 if (Scope *S = getScopeForContext(ClassDecl)) 5416 PushOnScopeChains(CopyAssignment, S, false); 5417 ClassDecl->addDecl(CopyAssignment); 5418 5419 AddOverriddenMethods(ClassDecl, CopyAssignment); 5420 return CopyAssignment; 5421} 5422 5423void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5424 CXXMethodDecl *CopyAssignOperator) { 5425 assert((CopyAssignOperator->isImplicit() && 5426 CopyAssignOperator->isOverloadedOperator() && 5427 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5428 !CopyAssignOperator->isUsed(false)) && 5429 "DefineImplicitCopyAssignment called for wrong function"); 5430 5431 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5432 5433 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5434 CopyAssignOperator->setInvalidDecl(); 5435 return; 5436 } 5437 5438 CopyAssignOperator->setUsed(); 5439 5440 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5441 DiagnosticErrorTrap Trap(Diags); 5442 5443 // C++0x [class.copy]p30: 5444 // The implicitly-defined or explicitly-defaulted copy assignment operator 5445 // for a non-union class X performs memberwise copy assignment of its 5446 // subobjects. The direct base classes of X are assigned first, in the 5447 // order of their declaration in the base-specifier-list, and then the 5448 // immediate non-static data members of X are assigned, in the order in 5449 // which they were declared in the class definition. 5450 5451 // The statements that form the synthesized function body. 5452 ASTOwningVector<Stmt*> Statements(*this); 5453 5454 // The parameter for the "other" object, which we are copying from. 5455 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5456 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5457 QualType OtherRefType = Other->getType(); 5458 if (const LValueReferenceType *OtherRef 5459 = OtherRefType->getAs<LValueReferenceType>()) { 5460 OtherRefType = OtherRef->getPointeeType(); 5461 OtherQuals = OtherRefType.getQualifiers(); 5462 } 5463 5464 // Our location for everything implicitly-generated. 5465 SourceLocation Loc = CopyAssignOperator->getLocation(); 5466 5467 // Construct a reference to the "other" object. We'll be using this 5468 // throughout the generated ASTs. 5469 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5470 assert(OtherRef && "Reference to parameter cannot fail!"); 5471 5472 // Construct the "this" pointer. We'll be using this throughout the generated 5473 // ASTs. 5474 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5475 assert(This && "Reference to this cannot fail!"); 5476 5477 // Assign base classes. 5478 bool Invalid = false; 5479 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5480 E = ClassDecl->bases_end(); Base != E; ++Base) { 5481 // Form the assignment: 5482 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5483 QualType BaseType = Base->getType().getUnqualifiedType(); 5484 if (!BaseType->isRecordType()) { 5485 Invalid = true; 5486 continue; 5487 } 5488 5489 CXXCastPath BasePath; 5490 BasePath.push_back(Base); 5491 5492 // Construct the "from" expression, which is an implicit cast to the 5493 // appropriately-qualified base type. 5494 Expr *From = OtherRef; 5495 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5496 CK_UncheckedDerivedToBase, 5497 VK_LValue, &BasePath); 5498 5499 // Dereference "this". 5500 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5501 5502 // Implicitly cast "this" to the appropriately-qualified base type. 5503 Expr *ToE = To.takeAs<Expr>(); 5504 ImpCastExprToType(ToE, 5505 Context.getCVRQualifiedType(BaseType, 5506 CopyAssignOperator->getTypeQualifiers()), 5507 CK_UncheckedDerivedToBase, 5508 VK_LValue, &BasePath); 5509 To = Owned(ToE); 5510 5511 // Build the copy. 5512 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5513 To.get(), From, 5514 /*CopyingBaseSubobject=*/true); 5515 if (Copy.isInvalid()) { 5516 Diag(CurrentLocation, diag::note_member_synthesized_at) 5517 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5518 CopyAssignOperator->setInvalidDecl(); 5519 return; 5520 } 5521 5522 // Success! Record the copy. 5523 Statements.push_back(Copy.takeAs<Expr>()); 5524 } 5525 5526 // \brief Reference to the __builtin_memcpy function. 5527 Expr *BuiltinMemCpyRef = 0; 5528 // \brief Reference to the __builtin_objc_memmove_collectable function. 5529 Expr *CollectableMemCpyRef = 0; 5530 5531 // Assign non-static members. 5532 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5533 FieldEnd = ClassDecl->field_end(); 5534 Field != FieldEnd; ++Field) { 5535 // Check for members of reference type; we can't copy those. 5536 if (Field->getType()->isReferenceType()) { 5537 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5538 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5539 Diag(Field->getLocation(), diag::note_declared_at); 5540 Diag(CurrentLocation, diag::note_member_synthesized_at) 5541 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5542 Invalid = true; 5543 continue; 5544 } 5545 5546 // Check for members of const-qualified, non-class type. 5547 QualType BaseType = Context.getBaseElementType(Field->getType()); 5548 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5549 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5550 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5551 Diag(Field->getLocation(), diag::note_declared_at); 5552 Diag(CurrentLocation, diag::note_member_synthesized_at) 5553 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5554 Invalid = true; 5555 continue; 5556 } 5557 5558 QualType FieldType = Field->getType().getNonReferenceType(); 5559 if (FieldType->isIncompleteArrayType()) { 5560 assert(ClassDecl->hasFlexibleArrayMember() && 5561 "Incomplete array type is not valid"); 5562 continue; 5563 } 5564 5565 // Build references to the field in the object we're copying from and to. 5566 CXXScopeSpec SS; // Intentionally empty 5567 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5568 LookupMemberName); 5569 MemberLookup.addDecl(*Field); 5570 MemberLookup.resolveKind(); 5571 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5572 Loc, /*IsArrow=*/false, 5573 SS, 0, MemberLookup, 0); 5574 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5575 Loc, /*IsArrow=*/true, 5576 SS, 0, MemberLookup, 0); 5577 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5578 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5579 5580 // If the field should be copied with __builtin_memcpy rather than via 5581 // explicit assignments, do so. This optimization only applies for arrays 5582 // of scalars and arrays of class type with trivial copy-assignment 5583 // operators. 5584 if (FieldType->isArrayType() && 5585 (!BaseType->isRecordType() || 5586 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5587 ->hasTrivialCopyAssignment())) { 5588 // Compute the size of the memory buffer to be copied. 5589 QualType SizeType = Context.getSizeType(); 5590 llvm::APInt Size(Context.getTypeSize(SizeType), 5591 Context.getTypeSizeInChars(BaseType).getQuantity()); 5592 for (const ConstantArrayType *Array 5593 = Context.getAsConstantArrayType(FieldType); 5594 Array; 5595 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5596 llvm::APInt ArraySize 5597 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5598 Size *= ArraySize; 5599 } 5600 5601 // Take the address of the field references for "from" and "to". 5602 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5603 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5604 5605 bool NeedsCollectableMemCpy = 5606 (BaseType->isRecordType() && 5607 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5608 5609 if (NeedsCollectableMemCpy) { 5610 if (!CollectableMemCpyRef) { 5611 // Create a reference to the __builtin_objc_memmove_collectable function. 5612 LookupResult R(*this, 5613 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5614 Loc, LookupOrdinaryName); 5615 LookupName(R, TUScope, true); 5616 5617 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5618 if (!CollectableMemCpy) { 5619 // Something went horribly wrong earlier, and we will have 5620 // complained about it. 5621 Invalid = true; 5622 continue; 5623 } 5624 5625 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5626 CollectableMemCpy->getType(), 5627 VK_LValue, Loc, 0).take(); 5628 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5629 } 5630 } 5631 // Create a reference to the __builtin_memcpy builtin function. 5632 else if (!BuiltinMemCpyRef) { 5633 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5634 LookupOrdinaryName); 5635 LookupName(R, TUScope, true); 5636 5637 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5638 if (!BuiltinMemCpy) { 5639 // Something went horribly wrong earlier, and we will have complained 5640 // about it. 5641 Invalid = true; 5642 continue; 5643 } 5644 5645 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5646 BuiltinMemCpy->getType(), 5647 VK_LValue, Loc, 0).take(); 5648 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5649 } 5650 5651 ASTOwningVector<Expr*> CallArgs(*this); 5652 CallArgs.push_back(To.takeAs<Expr>()); 5653 CallArgs.push_back(From.takeAs<Expr>()); 5654 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5655 ExprResult Call = ExprError(); 5656 if (NeedsCollectableMemCpy) 5657 Call = ActOnCallExpr(/*Scope=*/0, 5658 CollectableMemCpyRef, 5659 Loc, move_arg(CallArgs), 5660 Loc); 5661 else 5662 Call = ActOnCallExpr(/*Scope=*/0, 5663 BuiltinMemCpyRef, 5664 Loc, move_arg(CallArgs), 5665 Loc); 5666 5667 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5668 Statements.push_back(Call.takeAs<Expr>()); 5669 continue; 5670 } 5671 5672 // Build the copy of this field. 5673 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5674 To.get(), From.get(), 5675 /*CopyingBaseSubobject=*/false); 5676 if (Copy.isInvalid()) { 5677 Diag(CurrentLocation, diag::note_member_synthesized_at) 5678 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5679 CopyAssignOperator->setInvalidDecl(); 5680 return; 5681 } 5682 5683 // Success! Record the copy. 5684 Statements.push_back(Copy.takeAs<Stmt>()); 5685 } 5686 5687 if (!Invalid) { 5688 // Add a "return *this;" 5689 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5690 5691 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5692 if (Return.isInvalid()) 5693 Invalid = true; 5694 else { 5695 Statements.push_back(Return.takeAs<Stmt>()); 5696 5697 if (Trap.hasErrorOccurred()) { 5698 Diag(CurrentLocation, diag::note_member_synthesized_at) 5699 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5700 Invalid = true; 5701 } 5702 } 5703 } 5704 5705 if (Invalid) { 5706 CopyAssignOperator->setInvalidDecl(); 5707 return; 5708 } 5709 5710 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5711 /*isStmtExpr=*/false); 5712 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5713 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5714} 5715 5716CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5717 CXXRecordDecl *ClassDecl) { 5718 // C++ [class.copy]p4: 5719 // If the class definition does not explicitly declare a copy 5720 // constructor, one is declared implicitly. 5721 5722 // C++ [class.copy]p5: 5723 // The implicitly-declared copy constructor for a class X will 5724 // have the form 5725 // 5726 // X::X(const X&) 5727 // 5728 // if 5729 bool HasConstCopyConstructor = true; 5730 5731 // -- each direct or virtual base class B of X has a copy 5732 // constructor whose first parameter is of type const B& or 5733 // const volatile B&, and 5734 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5735 BaseEnd = ClassDecl->bases_end(); 5736 HasConstCopyConstructor && Base != BaseEnd; 5737 ++Base) { 5738 // Virtual bases are handled below. 5739 if (Base->isVirtual()) 5740 continue; 5741 5742 CXXRecordDecl *BaseClassDecl 5743 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5744 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5745 DeclareImplicitCopyConstructor(BaseClassDecl); 5746 5747 HasConstCopyConstructor 5748 = BaseClassDecl->hasConstCopyConstructor(Context); 5749 } 5750 5751 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5752 BaseEnd = ClassDecl->vbases_end(); 5753 HasConstCopyConstructor && Base != BaseEnd; 5754 ++Base) { 5755 CXXRecordDecl *BaseClassDecl 5756 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5757 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5758 DeclareImplicitCopyConstructor(BaseClassDecl); 5759 5760 HasConstCopyConstructor 5761 = BaseClassDecl->hasConstCopyConstructor(Context); 5762 } 5763 5764 // -- for all the nonstatic data members of X that are of a 5765 // class type M (or array thereof), each such class type 5766 // has a copy constructor whose first parameter is of type 5767 // const M& or const volatile M&. 5768 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5769 FieldEnd = ClassDecl->field_end(); 5770 HasConstCopyConstructor && Field != FieldEnd; 5771 ++Field) { 5772 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5773 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5774 CXXRecordDecl *FieldClassDecl 5775 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5776 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5777 DeclareImplicitCopyConstructor(FieldClassDecl); 5778 5779 HasConstCopyConstructor 5780 = FieldClassDecl->hasConstCopyConstructor(Context); 5781 } 5782 } 5783 5784 // Otherwise, the implicitly declared copy constructor will have 5785 // the form 5786 // 5787 // X::X(X&) 5788 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5789 QualType ArgType = ClassType; 5790 if (HasConstCopyConstructor) 5791 ArgType = ArgType.withConst(); 5792 ArgType = Context.getLValueReferenceType(ArgType); 5793 5794 // C++ [except.spec]p14: 5795 // An implicitly declared special member function (Clause 12) shall have an 5796 // exception-specification. [...] 5797 ImplicitExceptionSpecification ExceptSpec(Context); 5798 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5799 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5800 BaseEnd = ClassDecl->bases_end(); 5801 Base != BaseEnd; 5802 ++Base) { 5803 // Virtual bases are handled below. 5804 if (Base->isVirtual()) 5805 continue; 5806 5807 CXXRecordDecl *BaseClassDecl 5808 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5809 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5810 DeclareImplicitCopyConstructor(BaseClassDecl); 5811 5812 if (CXXConstructorDecl *CopyConstructor 5813 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5814 ExceptSpec.CalledDecl(CopyConstructor); 5815 } 5816 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5817 BaseEnd = ClassDecl->vbases_end(); 5818 Base != BaseEnd; 5819 ++Base) { 5820 CXXRecordDecl *BaseClassDecl 5821 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5822 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5823 DeclareImplicitCopyConstructor(BaseClassDecl); 5824 5825 if (CXXConstructorDecl *CopyConstructor 5826 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5827 ExceptSpec.CalledDecl(CopyConstructor); 5828 } 5829 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5830 FieldEnd = ClassDecl->field_end(); 5831 Field != FieldEnd; 5832 ++Field) { 5833 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5834 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5835 CXXRecordDecl *FieldClassDecl 5836 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5837 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5838 DeclareImplicitCopyConstructor(FieldClassDecl); 5839 5840 if (CXXConstructorDecl *CopyConstructor 5841 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5842 ExceptSpec.CalledDecl(CopyConstructor); 5843 } 5844 } 5845 5846 // An implicitly-declared copy constructor is an inline public 5847 // member of its class. 5848 FunctionProtoType::ExtProtoInfo EPI; 5849 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5850 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5851 EPI.NumExceptions = ExceptSpec.size(); 5852 EPI.Exceptions = ExceptSpec.data(); 5853 DeclarationName Name 5854 = Context.DeclarationNames.getCXXConstructorName( 5855 Context.getCanonicalType(ClassType)); 5856 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5857 CXXConstructorDecl *CopyConstructor 5858 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5859 Context.getFunctionType(Context.VoidTy, 5860 &ArgType, 1, EPI), 5861 /*TInfo=*/0, 5862 /*isExplicit=*/false, 5863 /*isInline=*/true, 5864 /*isImplicitlyDeclared=*/true); 5865 CopyConstructor->setAccess(AS_public); 5866 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5867 5868 // Note that we have declared this constructor. 5869 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5870 5871 // Add the parameter to the constructor. 5872 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5873 ClassDecl->getLocation(), 5874 /*IdentifierInfo=*/0, 5875 ArgType, /*TInfo=*/0, 5876 SC_None, 5877 SC_None, 0); 5878 CopyConstructor->setParams(&FromParam, 1); 5879 if (Scope *S = getScopeForContext(ClassDecl)) 5880 PushOnScopeChains(CopyConstructor, S, false); 5881 ClassDecl->addDecl(CopyConstructor); 5882 5883 return CopyConstructor; 5884} 5885 5886void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5887 CXXConstructorDecl *CopyConstructor, 5888 unsigned TypeQuals) { 5889 assert((CopyConstructor->isImplicit() && 5890 CopyConstructor->isCopyConstructor(TypeQuals) && 5891 !CopyConstructor->isUsed(false)) && 5892 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5893 5894 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5895 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5896 5897 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5898 DiagnosticErrorTrap Trap(Diags); 5899 5900 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5901 Trap.hasErrorOccurred()) { 5902 Diag(CurrentLocation, diag::note_member_synthesized_at) 5903 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5904 CopyConstructor->setInvalidDecl(); 5905 } else { 5906 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5907 CopyConstructor->getLocation(), 5908 MultiStmtArg(*this, 0, 0), 5909 /*isStmtExpr=*/false) 5910 .takeAs<Stmt>()); 5911 } 5912 5913 CopyConstructor->setUsed(); 5914} 5915 5916ExprResult 5917Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5918 CXXConstructorDecl *Constructor, 5919 MultiExprArg ExprArgs, 5920 bool RequiresZeroInit, 5921 unsigned ConstructKind, 5922 SourceRange ParenRange) { 5923 bool Elidable = false; 5924 5925 // C++0x [class.copy]p34: 5926 // When certain criteria are met, an implementation is allowed to 5927 // omit the copy/move construction of a class object, even if the 5928 // copy/move constructor and/or destructor for the object have 5929 // side effects. [...] 5930 // - when a temporary class object that has not been bound to a 5931 // reference (12.2) would be copied/moved to a class object 5932 // with the same cv-unqualified type, the copy/move operation 5933 // can be omitted by constructing the temporary object 5934 // directly into the target of the omitted copy/move 5935 if (ConstructKind == CXXConstructExpr::CK_Complete && 5936 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5937 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5938 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5939 } 5940 5941 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5942 Elidable, move(ExprArgs), RequiresZeroInit, 5943 ConstructKind, ParenRange); 5944} 5945 5946/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5947/// including handling of its default argument expressions. 5948ExprResult 5949Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5950 CXXConstructorDecl *Constructor, bool Elidable, 5951 MultiExprArg ExprArgs, 5952 bool RequiresZeroInit, 5953 unsigned ConstructKind, 5954 SourceRange ParenRange) { 5955 unsigned NumExprs = ExprArgs.size(); 5956 Expr **Exprs = (Expr **)ExprArgs.release(); 5957 5958 MarkDeclarationReferenced(ConstructLoc, Constructor); 5959 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5960 Constructor, Elidable, Exprs, NumExprs, 5961 RequiresZeroInit, 5962 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5963 ParenRange)); 5964} 5965 5966bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5967 CXXConstructorDecl *Constructor, 5968 MultiExprArg Exprs) { 5969 // FIXME: Provide the correct paren SourceRange when available. 5970 ExprResult TempResult = 5971 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5972 move(Exprs), false, CXXConstructExpr::CK_Complete, 5973 SourceRange()); 5974 if (TempResult.isInvalid()) 5975 return true; 5976 5977 Expr *Temp = TempResult.takeAs<Expr>(); 5978 CheckImplicitConversions(Temp, VD->getLocation()); 5979 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5980 Temp = MaybeCreateExprWithCleanups(Temp); 5981 VD->setInit(Temp); 5982 5983 return false; 5984} 5985 5986void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5987 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5988 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5989 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5990 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5991 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5992 CheckDestructorAccess(VD->getLocation(), Destructor, 5993 PDiag(diag::err_access_dtor_var) 5994 << VD->getDeclName() 5995 << VD->getType()); 5996 5997 // TODO: this should be re-enabled for static locals by !CXAAtExit 5998 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5999 Diag(VD->getLocation(), diag::warn_global_destructor); 6000 } 6001} 6002 6003/// AddCXXDirectInitializerToDecl - This action is called immediately after 6004/// ActOnDeclarator, when a C++ direct initializer is present. 6005/// e.g: "int x(1);" 6006void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6007 SourceLocation LParenLoc, 6008 MultiExprArg Exprs, 6009 SourceLocation RParenLoc, 6010 bool TypeMayContainAuto) { 6011 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6012 6013 // If there is no declaration, there was an error parsing it. Just ignore 6014 // the initializer. 6015 if (RealDecl == 0) 6016 return; 6017 6018 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6019 if (!VDecl) { 6020 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6021 RealDecl->setInvalidDecl(); 6022 return; 6023 } 6024 6025 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6026 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6027 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6028 if (Exprs.size() > 1) { 6029 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6030 diag::err_auto_var_init_multiple_expressions) 6031 << VDecl->getDeclName() << VDecl->getType() 6032 << VDecl->getSourceRange(); 6033 RealDecl->setInvalidDecl(); 6034 return; 6035 } 6036 6037 Expr *Init = Exprs.get()[0]; 6038 QualType DeducedType; 6039 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 6040 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6041 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6042 << Init->getSourceRange(); 6043 RealDecl->setInvalidDecl(); 6044 return; 6045 } 6046 VDecl->setType(DeducedType); 6047 6048 // If this is a redeclaration, check that the type we just deduced matches 6049 // the previously declared type. 6050 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6051 MergeVarDeclTypes(VDecl, Old); 6052 } 6053 6054 // We will represent direct-initialization similarly to copy-initialization: 6055 // int x(1); -as-> int x = 1; 6056 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6057 // 6058 // Clients that want to distinguish between the two forms, can check for 6059 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6060 // A major benefit is that clients that don't particularly care about which 6061 // exactly form was it (like the CodeGen) can handle both cases without 6062 // special case code. 6063 6064 // C++ 8.5p11: 6065 // The form of initialization (using parentheses or '=') is generally 6066 // insignificant, but does matter when the entity being initialized has a 6067 // class type. 6068 6069 if (!VDecl->getType()->isDependentType() && 6070 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6071 diag::err_typecheck_decl_incomplete_type)) { 6072 VDecl->setInvalidDecl(); 6073 return; 6074 } 6075 6076 // The variable can not have an abstract class type. 6077 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6078 diag::err_abstract_type_in_decl, 6079 AbstractVariableType)) 6080 VDecl->setInvalidDecl(); 6081 6082 const VarDecl *Def; 6083 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6084 Diag(VDecl->getLocation(), diag::err_redefinition) 6085 << VDecl->getDeclName(); 6086 Diag(Def->getLocation(), diag::note_previous_definition); 6087 VDecl->setInvalidDecl(); 6088 return; 6089 } 6090 6091 // C++ [class.static.data]p4 6092 // If a static data member is of const integral or const 6093 // enumeration type, its declaration in the class definition can 6094 // specify a constant-initializer which shall be an integral 6095 // constant expression (5.19). In that case, the member can appear 6096 // in integral constant expressions. The member shall still be 6097 // defined in a namespace scope if it is used in the program and the 6098 // namespace scope definition shall not contain an initializer. 6099 // 6100 // We already performed a redefinition check above, but for static 6101 // data members we also need to check whether there was an in-class 6102 // declaration with an initializer. 6103 const VarDecl* PrevInit = 0; 6104 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6105 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6106 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6107 return; 6108 } 6109 6110 bool IsDependent = false; 6111 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6112 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6113 VDecl->setInvalidDecl(); 6114 return; 6115 } 6116 6117 if (Exprs.get()[I]->isTypeDependent()) 6118 IsDependent = true; 6119 } 6120 6121 // If either the declaration has a dependent type or if any of the 6122 // expressions is type-dependent, we represent the initialization 6123 // via a ParenListExpr for later use during template instantiation. 6124 if (VDecl->getType()->isDependentType() || IsDependent) { 6125 // Let clients know that initialization was done with a direct initializer. 6126 VDecl->setCXXDirectInitializer(true); 6127 6128 // Store the initialization expressions as a ParenListExpr. 6129 unsigned NumExprs = Exprs.size(); 6130 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6131 (Expr **)Exprs.release(), 6132 NumExprs, RParenLoc)); 6133 return; 6134 } 6135 6136 // Capture the variable that is being initialized and the style of 6137 // initialization. 6138 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6139 6140 // FIXME: Poor source location information. 6141 InitializationKind Kind 6142 = InitializationKind::CreateDirect(VDecl->getLocation(), 6143 LParenLoc, RParenLoc); 6144 6145 InitializationSequence InitSeq(*this, Entity, Kind, 6146 Exprs.get(), Exprs.size()); 6147 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6148 if (Result.isInvalid()) { 6149 VDecl->setInvalidDecl(); 6150 return; 6151 } 6152 6153 CheckImplicitConversions(Result.get(), LParenLoc); 6154 6155 Result = MaybeCreateExprWithCleanups(Result); 6156 VDecl->setInit(Result.takeAs<Expr>()); 6157 VDecl->setCXXDirectInitializer(true); 6158 6159 CheckCompleteVariableDeclaration(VDecl); 6160} 6161 6162/// \brief Given a constructor and the set of arguments provided for the 6163/// constructor, convert the arguments and add any required default arguments 6164/// to form a proper call to this constructor. 6165/// 6166/// \returns true if an error occurred, false otherwise. 6167bool 6168Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6169 MultiExprArg ArgsPtr, 6170 SourceLocation Loc, 6171 ASTOwningVector<Expr*> &ConvertedArgs) { 6172 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6173 unsigned NumArgs = ArgsPtr.size(); 6174 Expr **Args = (Expr **)ArgsPtr.get(); 6175 6176 const FunctionProtoType *Proto 6177 = Constructor->getType()->getAs<FunctionProtoType>(); 6178 assert(Proto && "Constructor without a prototype?"); 6179 unsigned NumArgsInProto = Proto->getNumArgs(); 6180 6181 // If too few arguments are available, we'll fill in the rest with defaults. 6182 if (NumArgs < NumArgsInProto) 6183 ConvertedArgs.reserve(NumArgsInProto); 6184 else 6185 ConvertedArgs.reserve(NumArgs); 6186 6187 VariadicCallType CallType = 6188 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6189 llvm::SmallVector<Expr *, 8> AllArgs; 6190 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6191 Proto, 0, Args, NumArgs, AllArgs, 6192 CallType); 6193 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6194 ConvertedArgs.push_back(AllArgs[i]); 6195 return Invalid; 6196} 6197 6198static inline bool 6199CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6200 const FunctionDecl *FnDecl) { 6201 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6202 if (isa<NamespaceDecl>(DC)) { 6203 return SemaRef.Diag(FnDecl->getLocation(), 6204 diag::err_operator_new_delete_declared_in_namespace) 6205 << FnDecl->getDeclName(); 6206 } 6207 6208 if (isa<TranslationUnitDecl>(DC) && 6209 FnDecl->getStorageClass() == SC_Static) { 6210 return SemaRef.Diag(FnDecl->getLocation(), 6211 diag::err_operator_new_delete_declared_static) 6212 << FnDecl->getDeclName(); 6213 } 6214 6215 return false; 6216} 6217 6218static inline bool 6219CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6220 CanQualType ExpectedResultType, 6221 CanQualType ExpectedFirstParamType, 6222 unsigned DependentParamTypeDiag, 6223 unsigned InvalidParamTypeDiag) { 6224 QualType ResultType = 6225 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6226 6227 // Check that the result type is not dependent. 6228 if (ResultType->isDependentType()) 6229 return SemaRef.Diag(FnDecl->getLocation(), 6230 diag::err_operator_new_delete_dependent_result_type) 6231 << FnDecl->getDeclName() << ExpectedResultType; 6232 6233 // Check that the result type is what we expect. 6234 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6235 return SemaRef.Diag(FnDecl->getLocation(), 6236 diag::err_operator_new_delete_invalid_result_type) 6237 << FnDecl->getDeclName() << ExpectedResultType; 6238 6239 // A function template must have at least 2 parameters. 6240 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6241 return SemaRef.Diag(FnDecl->getLocation(), 6242 diag::err_operator_new_delete_template_too_few_parameters) 6243 << FnDecl->getDeclName(); 6244 6245 // The function decl must have at least 1 parameter. 6246 if (FnDecl->getNumParams() == 0) 6247 return SemaRef.Diag(FnDecl->getLocation(), 6248 diag::err_operator_new_delete_too_few_parameters) 6249 << FnDecl->getDeclName(); 6250 6251 // Check the the first parameter type is not dependent. 6252 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6253 if (FirstParamType->isDependentType()) 6254 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6255 << FnDecl->getDeclName() << ExpectedFirstParamType; 6256 6257 // Check that the first parameter type is what we expect. 6258 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6259 ExpectedFirstParamType) 6260 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6261 << FnDecl->getDeclName() << ExpectedFirstParamType; 6262 6263 return false; 6264} 6265 6266static bool 6267CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6268 // C++ [basic.stc.dynamic.allocation]p1: 6269 // A program is ill-formed if an allocation function is declared in a 6270 // namespace scope other than global scope or declared static in global 6271 // scope. 6272 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6273 return true; 6274 6275 CanQualType SizeTy = 6276 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6277 6278 // C++ [basic.stc.dynamic.allocation]p1: 6279 // The return type shall be void*. The first parameter shall have type 6280 // std::size_t. 6281 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6282 SizeTy, 6283 diag::err_operator_new_dependent_param_type, 6284 diag::err_operator_new_param_type)) 6285 return true; 6286 6287 // C++ [basic.stc.dynamic.allocation]p1: 6288 // The first parameter shall not have an associated default argument. 6289 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6290 return SemaRef.Diag(FnDecl->getLocation(), 6291 diag::err_operator_new_default_arg) 6292 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6293 6294 return false; 6295} 6296 6297static bool 6298CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6299 // C++ [basic.stc.dynamic.deallocation]p1: 6300 // A program is ill-formed if deallocation functions are declared in a 6301 // namespace scope other than global scope or declared static in global 6302 // scope. 6303 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6304 return true; 6305 6306 // C++ [basic.stc.dynamic.deallocation]p2: 6307 // Each deallocation function shall return void and its first parameter 6308 // shall be void*. 6309 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6310 SemaRef.Context.VoidPtrTy, 6311 diag::err_operator_delete_dependent_param_type, 6312 diag::err_operator_delete_param_type)) 6313 return true; 6314 6315 return false; 6316} 6317 6318/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6319/// of this overloaded operator is well-formed. If so, returns false; 6320/// otherwise, emits appropriate diagnostics and returns true. 6321bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6322 assert(FnDecl && FnDecl->isOverloadedOperator() && 6323 "Expected an overloaded operator declaration"); 6324 6325 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6326 6327 // C++ [over.oper]p5: 6328 // The allocation and deallocation functions, operator new, 6329 // operator new[], operator delete and operator delete[], are 6330 // described completely in 3.7.3. The attributes and restrictions 6331 // found in the rest of this subclause do not apply to them unless 6332 // explicitly stated in 3.7.3. 6333 if (Op == OO_Delete || Op == OO_Array_Delete) 6334 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6335 6336 if (Op == OO_New || Op == OO_Array_New) 6337 return CheckOperatorNewDeclaration(*this, FnDecl); 6338 6339 // C++ [over.oper]p6: 6340 // An operator function shall either be a non-static member 6341 // function or be a non-member function and have at least one 6342 // parameter whose type is a class, a reference to a class, an 6343 // enumeration, or a reference to an enumeration. 6344 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6345 if (MethodDecl->isStatic()) 6346 return Diag(FnDecl->getLocation(), 6347 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6348 } else { 6349 bool ClassOrEnumParam = false; 6350 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6351 ParamEnd = FnDecl->param_end(); 6352 Param != ParamEnd; ++Param) { 6353 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6354 if (ParamType->isDependentType() || ParamType->isRecordType() || 6355 ParamType->isEnumeralType()) { 6356 ClassOrEnumParam = true; 6357 break; 6358 } 6359 } 6360 6361 if (!ClassOrEnumParam) 6362 return Diag(FnDecl->getLocation(), 6363 diag::err_operator_overload_needs_class_or_enum) 6364 << FnDecl->getDeclName(); 6365 } 6366 6367 // C++ [over.oper]p8: 6368 // An operator function cannot have default arguments (8.3.6), 6369 // except where explicitly stated below. 6370 // 6371 // Only the function-call operator allows default arguments 6372 // (C++ [over.call]p1). 6373 if (Op != OO_Call) { 6374 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6375 Param != FnDecl->param_end(); ++Param) { 6376 if ((*Param)->hasDefaultArg()) 6377 return Diag((*Param)->getLocation(), 6378 diag::err_operator_overload_default_arg) 6379 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6380 } 6381 } 6382 6383 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6384 { false, false, false } 6385#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6386 , { Unary, Binary, MemberOnly } 6387#include "clang/Basic/OperatorKinds.def" 6388 }; 6389 6390 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6391 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6392 bool MustBeMemberOperator = OperatorUses[Op][2]; 6393 6394 // C++ [over.oper]p8: 6395 // [...] Operator functions cannot have more or fewer parameters 6396 // than the number required for the corresponding operator, as 6397 // described in the rest of this subclause. 6398 unsigned NumParams = FnDecl->getNumParams() 6399 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6400 if (Op != OO_Call && 6401 ((NumParams == 1 && !CanBeUnaryOperator) || 6402 (NumParams == 2 && !CanBeBinaryOperator) || 6403 (NumParams < 1) || (NumParams > 2))) { 6404 // We have the wrong number of parameters. 6405 unsigned ErrorKind; 6406 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6407 ErrorKind = 2; // 2 -> unary or binary. 6408 } else if (CanBeUnaryOperator) { 6409 ErrorKind = 0; // 0 -> unary 6410 } else { 6411 assert(CanBeBinaryOperator && 6412 "All non-call overloaded operators are unary or binary!"); 6413 ErrorKind = 1; // 1 -> binary 6414 } 6415 6416 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6417 << FnDecl->getDeclName() << NumParams << ErrorKind; 6418 } 6419 6420 // Overloaded operators other than operator() cannot be variadic. 6421 if (Op != OO_Call && 6422 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6423 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6424 << FnDecl->getDeclName(); 6425 } 6426 6427 // Some operators must be non-static member functions. 6428 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6429 return Diag(FnDecl->getLocation(), 6430 diag::err_operator_overload_must_be_member) 6431 << FnDecl->getDeclName(); 6432 } 6433 6434 // C++ [over.inc]p1: 6435 // The user-defined function called operator++ implements the 6436 // prefix and postfix ++ operator. If this function is a member 6437 // function with no parameters, or a non-member function with one 6438 // parameter of class or enumeration type, it defines the prefix 6439 // increment operator ++ for objects of that type. If the function 6440 // is a member function with one parameter (which shall be of type 6441 // int) or a non-member function with two parameters (the second 6442 // of which shall be of type int), it defines the postfix 6443 // increment operator ++ for objects of that type. 6444 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6445 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6446 bool ParamIsInt = false; 6447 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6448 ParamIsInt = BT->getKind() == BuiltinType::Int; 6449 6450 if (!ParamIsInt) 6451 return Diag(LastParam->getLocation(), 6452 diag::err_operator_overload_post_incdec_must_be_int) 6453 << LastParam->getType() << (Op == OO_MinusMinus); 6454 } 6455 6456 return false; 6457} 6458 6459/// CheckLiteralOperatorDeclaration - Check whether the declaration 6460/// of this literal operator function is well-formed. If so, returns 6461/// false; otherwise, emits appropriate diagnostics and returns true. 6462bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6463 DeclContext *DC = FnDecl->getDeclContext(); 6464 Decl::Kind Kind = DC->getDeclKind(); 6465 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6466 Kind != Decl::LinkageSpec) { 6467 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6468 << FnDecl->getDeclName(); 6469 return true; 6470 } 6471 6472 bool Valid = false; 6473 6474 // template <char...> type operator "" name() is the only valid template 6475 // signature, and the only valid signature with no parameters. 6476 if (FnDecl->param_size() == 0) { 6477 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6478 // Must have only one template parameter 6479 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6480 if (Params->size() == 1) { 6481 NonTypeTemplateParmDecl *PmDecl = 6482 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6483 6484 // The template parameter must be a char parameter pack. 6485 if (PmDecl && PmDecl->isTemplateParameterPack() && 6486 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6487 Valid = true; 6488 } 6489 } 6490 } else { 6491 // Check the first parameter 6492 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6493 6494 QualType T = (*Param)->getType(); 6495 6496 // unsigned long long int, long double, and any character type are allowed 6497 // as the only parameters. 6498 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6499 Context.hasSameType(T, Context.LongDoubleTy) || 6500 Context.hasSameType(T, Context.CharTy) || 6501 Context.hasSameType(T, Context.WCharTy) || 6502 Context.hasSameType(T, Context.Char16Ty) || 6503 Context.hasSameType(T, Context.Char32Ty)) { 6504 if (++Param == FnDecl->param_end()) 6505 Valid = true; 6506 goto FinishedParams; 6507 } 6508 6509 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6510 const PointerType *PT = T->getAs<PointerType>(); 6511 if (!PT) 6512 goto FinishedParams; 6513 T = PT->getPointeeType(); 6514 if (!T.isConstQualified()) 6515 goto FinishedParams; 6516 T = T.getUnqualifiedType(); 6517 6518 // Move on to the second parameter; 6519 ++Param; 6520 6521 // If there is no second parameter, the first must be a const char * 6522 if (Param == FnDecl->param_end()) { 6523 if (Context.hasSameType(T, Context.CharTy)) 6524 Valid = true; 6525 goto FinishedParams; 6526 } 6527 6528 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6529 // are allowed as the first parameter to a two-parameter function 6530 if (!(Context.hasSameType(T, Context.CharTy) || 6531 Context.hasSameType(T, Context.WCharTy) || 6532 Context.hasSameType(T, Context.Char16Ty) || 6533 Context.hasSameType(T, Context.Char32Ty))) 6534 goto FinishedParams; 6535 6536 // The second and final parameter must be an std::size_t 6537 T = (*Param)->getType().getUnqualifiedType(); 6538 if (Context.hasSameType(T, Context.getSizeType()) && 6539 ++Param == FnDecl->param_end()) 6540 Valid = true; 6541 } 6542 6543 // FIXME: This diagnostic is absolutely terrible. 6544FinishedParams: 6545 if (!Valid) { 6546 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6547 << FnDecl->getDeclName(); 6548 return true; 6549 } 6550 6551 return false; 6552} 6553 6554/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6555/// linkage specification, including the language and (if present) 6556/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6557/// the location of the language string literal, which is provided 6558/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6559/// the '{' brace. Otherwise, this linkage specification does not 6560/// have any braces. 6561Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6562 SourceLocation LangLoc, 6563 llvm::StringRef Lang, 6564 SourceLocation LBraceLoc) { 6565 LinkageSpecDecl::LanguageIDs Language; 6566 if (Lang == "\"C\"") 6567 Language = LinkageSpecDecl::lang_c; 6568 else if (Lang == "\"C++\"") 6569 Language = LinkageSpecDecl::lang_cxx; 6570 else { 6571 Diag(LangLoc, diag::err_bad_language); 6572 return 0; 6573 } 6574 6575 // FIXME: Add all the various semantics of linkage specifications 6576 6577 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6578 LangLoc, Language, 6579 LBraceLoc.isValid()); 6580 CurContext->addDecl(D); 6581 PushDeclContext(S, D); 6582 return D; 6583} 6584 6585/// ActOnFinishLinkageSpecification - Complete the definition of 6586/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6587/// valid, it's the position of the closing '}' brace in a linkage 6588/// specification that uses braces. 6589Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6590 Decl *LinkageSpec, 6591 SourceLocation RBraceLoc) { 6592 if (LinkageSpec) 6593 PopDeclContext(); 6594 return LinkageSpec; 6595} 6596 6597/// \brief Perform semantic analysis for the variable declaration that 6598/// occurs within a C++ catch clause, returning the newly-created 6599/// variable. 6600VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6601 TypeSourceInfo *TInfo, 6602 IdentifierInfo *Name, 6603 SourceLocation Loc) { 6604 bool Invalid = false; 6605 QualType ExDeclType = TInfo->getType(); 6606 6607 // Arrays and functions decay. 6608 if (ExDeclType->isArrayType()) 6609 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6610 else if (ExDeclType->isFunctionType()) 6611 ExDeclType = Context.getPointerType(ExDeclType); 6612 6613 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6614 // The exception-declaration shall not denote a pointer or reference to an 6615 // incomplete type, other than [cv] void*. 6616 // N2844 forbids rvalue references. 6617 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6618 Diag(Loc, diag::err_catch_rvalue_ref); 6619 Invalid = true; 6620 } 6621 6622 // GCC allows catching pointers and references to incomplete types 6623 // as an extension; so do we, but we warn by default. 6624 6625 QualType BaseType = ExDeclType; 6626 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6627 unsigned DK = diag::err_catch_incomplete; 6628 bool IncompleteCatchIsInvalid = true; 6629 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6630 BaseType = Ptr->getPointeeType(); 6631 Mode = 1; 6632 DK = diag::ext_catch_incomplete_ptr; 6633 IncompleteCatchIsInvalid = false; 6634 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6635 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6636 BaseType = Ref->getPointeeType(); 6637 Mode = 2; 6638 DK = diag::ext_catch_incomplete_ref; 6639 IncompleteCatchIsInvalid = false; 6640 } 6641 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6642 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6643 IncompleteCatchIsInvalid) 6644 Invalid = true; 6645 6646 if (!Invalid && !ExDeclType->isDependentType() && 6647 RequireNonAbstractType(Loc, ExDeclType, 6648 diag::err_abstract_type_in_decl, 6649 AbstractVariableType)) 6650 Invalid = true; 6651 6652 // Only the non-fragile NeXT runtime currently supports C++ catches 6653 // of ObjC types, and no runtime supports catching ObjC types by value. 6654 if (!Invalid && getLangOptions().ObjC1) { 6655 QualType T = ExDeclType; 6656 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6657 T = RT->getPointeeType(); 6658 6659 if (T->isObjCObjectType()) { 6660 Diag(Loc, diag::err_objc_object_catch); 6661 Invalid = true; 6662 } else if (T->isObjCObjectPointerType()) { 6663 if (!getLangOptions().NeXTRuntime) { 6664 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6665 Invalid = true; 6666 } else if (!getLangOptions().ObjCNonFragileABI) { 6667 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6668 Invalid = true; 6669 } 6670 } 6671 } 6672 6673 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6674 Name, ExDeclType, TInfo, SC_None, 6675 SC_None); 6676 ExDecl->setExceptionVariable(true); 6677 6678 if (!Invalid) { 6679 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6680 // C++ [except.handle]p16: 6681 // The object declared in an exception-declaration or, if the 6682 // exception-declaration does not specify a name, a temporary (12.2) is 6683 // copy-initialized (8.5) from the exception object. [...] 6684 // The object is destroyed when the handler exits, after the destruction 6685 // of any automatic objects initialized within the handler. 6686 // 6687 // We just pretend to initialize the object with itself, then make sure 6688 // it can be destroyed later. 6689 QualType initType = ExDeclType; 6690 6691 InitializedEntity entity = 6692 InitializedEntity::InitializeVariable(ExDecl); 6693 InitializationKind initKind = 6694 InitializationKind::CreateCopy(Loc, SourceLocation()); 6695 6696 Expr *opaqueValue = 6697 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6698 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6699 ExprResult result = sequence.Perform(*this, entity, initKind, 6700 MultiExprArg(&opaqueValue, 1)); 6701 if (result.isInvalid()) 6702 Invalid = true; 6703 else { 6704 // If the constructor used was non-trivial, set this as the 6705 // "initializer". 6706 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6707 if (!construct->getConstructor()->isTrivial()) { 6708 Expr *init = MaybeCreateExprWithCleanups(construct); 6709 ExDecl->setInit(init); 6710 } 6711 6712 // And make sure it's destructable. 6713 FinalizeVarWithDestructor(ExDecl, recordType); 6714 } 6715 } 6716 } 6717 6718 if (Invalid) 6719 ExDecl->setInvalidDecl(); 6720 6721 return ExDecl; 6722} 6723 6724/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6725/// handler. 6726Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6727 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6728 bool Invalid = D.isInvalidType(); 6729 6730 // Check for unexpanded parameter packs. 6731 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6732 UPPC_ExceptionType)) { 6733 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6734 D.getIdentifierLoc()); 6735 Invalid = true; 6736 } 6737 6738 IdentifierInfo *II = D.getIdentifier(); 6739 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6740 LookupOrdinaryName, 6741 ForRedeclaration)) { 6742 // The scope should be freshly made just for us. There is just no way 6743 // it contains any previous declaration. 6744 assert(!S->isDeclScope(PrevDecl)); 6745 if (PrevDecl->isTemplateParameter()) { 6746 // Maybe we will complain about the shadowed template parameter. 6747 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6748 } 6749 } 6750 6751 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6752 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6753 << D.getCXXScopeSpec().getRange(); 6754 Invalid = true; 6755 } 6756 6757 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6758 D.getIdentifier(), 6759 D.getIdentifierLoc()); 6760 6761 if (Invalid) 6762 ExDecl->setInvalidDecl(); 6763 6764 // Add the exception declaration into this scope. 6765 if (II) 6766 PushOnScopeChains(ExDecl, S); 6767 else 6768 CurContext->addDecl(ExDecl); 6769 6770 ProcessDeclAttributes(S, ExDecl, D); 6771 return ExDecl; 6772} 6773 6774Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6775 Expr *AssertExpr, 6776 Expr *AssertMessageExpr_) { 6777 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6778 6779 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6780 llvm::APSInt Value(32); 6781 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6782 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6783 AssertExpr->getSourceRange(); 6784 return 0; 6785 } 6786 6787 if (Value == 0) { 6788 Diag(AssertLoc, diag::err_static_assert_failed) 6789 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6790 } 6791 } 6792 6793 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6794 return 0; 6795 6796 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6797 AssertExpr, AssertMessage); 6798 6799 CurContext->addDecl(Decl); 6800 return Decl; 6801} 6802 6803/// \brief Perform semantic analysis of the given friend type declaration. 6804/// 6805/// \returns A friend declaration that. 6806FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6807 TypeSourceInfo *TSInfo) { 6808 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6809 6810 QualType T = TSInfo->getType(); 6811 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6812 6813 if (!getLangOptions().CPlusPlus0x) { 6814 // C++03 [class.friend]p2: 6815 // An elaborated-type-specifier shall be used in a friend declaration 6816 // for a class.* 6817 // 6818 // * The class-key of the elaborated-type-specifier is required. 6819 if (!ActiveTemplateInstantiations.empty()) { 6820 // Do not complain about the form of friend template types during 6821 // template instantiation; we will already have complained when the 6822 // template was declared. 6823 } else if (!T->isElaboratedTypeSpecifier()) { 6824 // If we evaluated the type to a record type, suggest putting 6825 // a tag in front. 6826 if (const RecordType *RT = T->getAs<RecordType>()) { 6827 RecordDecl *RD = RT->getDecl(); 6828 6829 std::string InsertionText = std::string(" ") + RD->getKindName(); 6830 6831 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6832 << (unsigned) RD->getTagKind() 6833 << T 6834 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6835 InsertionText); 6836 } else { 6837 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6838 << T 6839 << SourceRange(FriendLoc, TypeRange.getEnd()); 6840 } 6841 } else if (T->getAs<EnumType>()) { 6842 Diag(FriendLoc, diag::ext_enum_friend) 6843 << T 6844 << SourceRange(FriendLoc, TypeRange.getEnd()); 6845 } 6846 } 6847 6848 // C++0x [class.friend]p3: 6849 // If the type specifier in a friend declaration designates a (possibly 6850 // cv-qualified) class type, that class is declared as a friend; otherwise, 6851 // the friend declaration is ignored. 6852 6853 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6854 // in [class.friend]p3 that we do not implement. 6855 6856 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6857} 6858 6859/// Handle a friend tag declaration where the scope specifier was 6860/// templated. 6861Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6862 unsigned TagSpec, SourceLocation TagLoc, 6863 CXXScopeSpec &SS, 6864 IdentifierInfo *Name, SourceLocation NameLoc, 6865 AttributeList *Attr, 6866 MultiTemplateParamsArg TempParamLists) { 6867 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6868 6869 bool isExplicitSpecialization = false; 6870 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6871 bool Invalid = false; 6872 6873 if (TemplateParameterList *TemplateParams 6874 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6875 TempParamLists.get(), 6876 TempParamLists.size(), 6877 /*friend*/ true, 6878 isExplicitSpecialization, 6879 Invalid)) { 6880 --NumMatchedTemplateParamLists; 6881 6882 if (TemplateParams->size() > 0) { 6883 // This is a declaration of a class template. 6884 if (Invalid) 6885 return 0; 6886 6887 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6888 SS, Name, NameLoc, Attr, 6889 TemplateParams, AS_public).take(); 6890 } else { 6891 // The "template<>" header is extraneous. 6892 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6893 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6894 isExplicitSpecialization = true; 6895 } 6896 } 6897 6898 if (Invalid) return 0; 6899 6900 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6901 6902 bool isAllExplicitSpecializations = true; 6903 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6904 if (TempParamLists.get()[I]->size()) { 6905 isAllExplicitSpecializations = false; 6906 break; 6907 } 6908 } 6909 6910 // FIXME: don't ignore attributes. 6911 6912 // If it's explicit specializations all the way down, just forget 6913 // about the template header and build an appropriate non-templated 6914 // friend. TODO: for source fidelity, remember the headers. 6915 if (isAllExplicitSpecializations) { 6916 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6917 ElaboratedTypeKeyword Keyword 6918 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6919 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 6920 *Name, NameLoc); 6921 if (T.isNull()) 6922 return 0; 6923 6924 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6925 if (isa<DependentNameType>(T)) { 6926 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6927 TL.setKeywordLoc(TagLoc); 6928 TL.setQualifierLoc(QualifierLoc); 6929 TL.setNameLoc(NameLoc); 6930 } else { 6931 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6932 TL.setKeywordLoc(TagLoc); 6933 TL.setQualifierLoc(QualifierLoc); 6934 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6935 } 6936 6937 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6938 TSI, FriendLoc); 6939 Friend->setAccess(AS_public); 6940 CurContext->addDecl(Friend); 6941 return Friend; 6942 } 6943 6944 // Handle the case of a templated-scope friend class. e.g. 6945 // template <class T> class A<T>::B; 6946 // FIXME: we don't support these right now. 6947 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6948 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6949 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6950 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6951 TL.setKeywordLoc(TagLoc); 6952 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 6953 TL.setNameLoc(NameLoc); 6954 6955 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6956 TSI, FriendLoc); 6957 Friend->setAccess(AS_public); 6958 Friend->setUnsupportedFriend(true); 6959 CurContext->addDecl(Friend); 6960 return Friend; 6961} 6962 6963 6964/// Handle a friend type declaration. This works in tandem with 6965/// ActOnTag. 6966/// 6967/// Notes on friend class templates: 6968/// 6969/// We generally treat friend class declarations as if they were 6970/// declaring a class. So, for example, the elaborated type specifier 6971/// in a friend declaration is required to obey the restrictions of a 6972/// class-head (i.e. no typedefs in the scope chain), template 6973/// parameters are required to match up with simple template-ids, &c. 6974/// However, unlike when declaring a template specialization, it's 6975/// okay to refer to a template specialization without an empty 6976/// template parameter declaration, e.g. 6977/// friend class A<T>::B<unsigned>; 6978/// We permit this as a special case; if there are any template 6979/// parameters present at all, require proper matching, i.e. 6980/// template <> template <class T> friend class A<int>::B; 6981Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6982 MultiTemplateParamsArg TempParams) { 6983 SourceLocation Loc = DS.getSourceRange().getBegin(); 6984 6985 assert(DS.isFriendSpecified()); 6986 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6987 6988 // Try to convert the decl specifier to a type. This works for 6989 // friend templates because ActOnTag never produces a ClassTemplateDecl 6990 // for a TUK_Friend. 6991 Declarator TheDeclarator(DS, Declarator::MemberContext); 6992 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6993 QualType T = TSI->getType(); 6994 if (TheDeclarator.isInvalidType()) 6995 return 0; 6996 6997 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 6998 return 0; 6999 7000 // This is definitely an error in C++98. It's probably meant to 7001 // be forbidden in C++0x, too, but the specification is just 7002 // poorly written. 7003 // 7004 // The problem is with declarations like the following: 7005 // template <T> friend A<T>::foo; 7006 // where deciding whether a class C is a friend or not now hinges 7007 // on whether there exists an instantiation of A that causes 7008 // 'foo' to equal C. There are restrictions on class-heads 7009 // (which we declare (by fiat) elaborated friend declarations to 7010 // be) that makes this tractable. 7011 // 7012 // FIXME: handle "template <> friend class A<T>;", which 7013 // is possibly well-formed? Who even knows? 7014 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7015 Diag(Loc, diag::err_tagless_friend_type_template) 7016 << DS.getSourceRange(); 7017 return 0; 7018 } 7019 7020 // C++98 [class.friend]p1: A friend of a class is a function 7021 // or class that is not a member of the class . . . 7022 // This is fixed in DR77, which just barely didn't make the C++03 7023 // deadline. It's also a very silly restriction that seriously 7024 // affects inner classes and which nobody else seems to implement; 7025 // thus we never diagnose it, not even in -pedantic. 7026 // 7027 // But note that we could warn about it: it's always useless to 7028 // friend one of your own members (it's not, however, worthless to 7029 // friend a member of an arbitrary specialization of your template). 7030 7031 Decl *D; 7032 if (unsigned NumTempParamLists = TempParams.size()) 7033 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7034 NumTempParamLists, 7035 TempParams.release(), 7036 TSI, 7037 DS.getFriendSpecLoc()); 7038 else 7039 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7040 7041 if (!D) 7042 return 0; 7043 7044 D->setAccess(AS_public); 7045 CurContext->addDecl(D); 7046 7047 return D; 7048} 7049 7050Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7051 MultiTemplateParamsArg TemplateParams) { 7052 const DeclSpec &DS = D.getDeclSpec(); 7053 7054 assert(DS.isFriendSpecified()); 7055 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7056 7057 SourceLocation Loc = D.getIdentifierLoc(); 7058 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7059 QualType T = TInfo->getType(); 7060 7061 // C++ [class.friend]p1 7062 // A friend of a class is a function or class.... 7063 // Note that this sees through typedefs, which is intended. 7064 // It *doesn't* see through dependent types, which is correct 7065 // according to [temp.arg.type]p3: 7066 // If a declaration acquires a function type through a 7067 // type dependent on a template-parameter and this causes 7068 // a declaration that does not use the syntactic form of a 7069 // function declarator to have a function type, the program 7070 // is ill-formed. 7071 if (!T->isFunctionType()) { 7072 Diag(Loc, diag::err_unexpected_friend); 7073 7074 // It might be worthwhile to try to recover by creating an 7075 // appropriate declaration. 7076 return 0; 7077 } 7078 7079 // C++ [namespace.memdef]p3 7080 // - If a friend declaration in a non-local class first declares a 7081 // class or function, the friend class or function is a member 7082 // of the innermost enclosing namespace. 7083 // - The name of the friend is not found by simple name lookup 7084 // until a matching declaration is provided in that namespace 7085 // scope (either before or after the class declaration granting 7086 // friendship). 7087 // - If a friend function is called, its name may be found by the 7088 // name lookup that considers functions from namespaces and 7089 // classes associated with the types of the function arguments. 7090 // - When looking for a prior declaration of a class or a function 7091 // declared as a friend, scopes outside the innermost enclosing 7092 // namespace scope are not considered. 7093 7094 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7095 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7096 DeclarationName Name = NameInfo.getName(); 7097 assert(Name); 7098 7099 // Check for unexpanded parameter packs. 7100 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7101 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7102 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7103 return 0; 7104 7105 // The context we found the declaration in, or in which we should 7106 // create the declaration. 7107 DeclContext *DC; 7108 Scope *DCScope = S; 7109 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7110 ForRedeclaration); 7111 7112 // FIXME: there are different rules in local classes 7113 7114 // There are four cases here. 7115 // - There's no scope specifier, in which case we just go to the 7116 // appropriate scope and look for a function or function template 7117 // there as appropriate. 7118 // Recover from invalid scope qualifiers as if they just weren't there. 7119 if (SS.isInvalid() || !SS.isSet()) { 7120 // C++0x [namespace.memdef]p3: 7121 // If the name in a friend declaration is neither qualified nor 7122 // a template-id and the declaration is a function or an 7123 // elaborated-type-specifier, the lookup to determine whether 7124 // the entity has been previously declared shall not consider 7125 // any scopes outside the innermost enclosing namespace. 7126 // C++0x [class.friend]p11: 7127 // If a friend declaration appears in a local class and the name 7128 // specified is an unqualified name, a prior declaration is 7129 // looked up without considering scopes that are outside the 7130 // innermost enclosing non-class scope. For a friend function 7131 // declaration, if there is no prior declaration, the program is 7132 // ill-formed. 7133 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7134 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7135 7136 // Find the appropriate context according to the above. 7137 DC = CurContext; 7138 while (true) { 7139 // Skip class contexts. If someone can cite chapter and verse 7140 // for this behavior, that would be nice --- it's what GCC and 7141 // EDG do, and it seems like a reasonable intent, but the spec 7142 // really only says that checks for unqualified existing 7143 // declarations should stop at the nearest enclosing namespace, 7144 // not that they should only consider the nearest enclosing 7145 // namespace. 7146 while (DC->isRecord()) 7147 DC = DC->getParent(); 7148 7149 LookupQualifiedName(Previous, DC); 7150 7151 // TODO: decide what we think about using declarations. 7152 if (isLocal || !Previous.empty()) 7153 break; 7154 7155 if (isTemplateId) { 7156 if (isa<TranslationUnitDecl>(DC)) break; 7157 } else { 7158 if (DC->isFileContext()) break; 7159 } 7160 DC = DC->getParent(); 7161 } 7162 7163 // C++ [class.friend]p1: A friend of a class is a function or 7164 // class that is not a member of the class . . . 7165 // C++0x changes this for both friend types and functions. 7166 // Most C++ 98 compilers do seem to give an error here, so 7167 // we do, too. 7168 if (!Previous.empty() && DC->Equals(CurContext) 7169 && !getLangOptions().CPlusPlus0x) 7170 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7171 7172 DCScope = getScopeForDeclContext(S, DC); 7173 7174 // - There's a non-dependent scope specifier, in which case we 7175 // compute it and do a previous lookup there for a function 7176 // or function template. 7177 } else if (!SS.getScopeRep()->isDependent()) { 7178 DC = computeDeclContext(SS); 7179 if (!DC) return 0; 7180 7181 if (RequireCompleteDeclContext(SS, DC)) return 0; 7182 7183 LookupQualifiedName(Previous, DC); 7184 7185 // Ignore things found implicitly in the wrong scope. 7186 // TODO: better diagnostics for this case. Suggesting the right 7187 // qualified scope would be nice... 7188 LookupResult::Filter F = Previous.makeFilter(); 7189 while (F.hasNext()) { 7190 NamedDecl *D = F.next(); 7191 if (!DC->InEnclosingNamespaceSetOf( 7192 D->getDeclContext()->getRedeclContext())) 7193 F.erase(); 7194 } 7195 F.done(); 7196 7197 if (Previous.empty()) { 7198 D.setInvalidType(); 7199 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7200 return 0; 7201 } 7202 7203 // C++ [class.friend]p1: A friend of a class is a function or 7204 // class that is not a member of the class . . . 7205 if (DC->Equals(CurContext)) 7206 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7207 7208 // - There's a scope specifier that does not match any template 7209 // parameter lists, in which case we use some arbitrary context, 7210 // create a method or method template, and wait for instantiation. 7211 // - There's a scope specifier that does match some template 7212 // parameter lists, which we don't handle right now. 7213 } else { 7214 DC = CurContext; 7215 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7216 } 7217 7218 if (!DC->isRecord()) { 7219 // This implies that it has to be an operator or function. 7220 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7221 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7222 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7223 Diag(Loc, diag::err_introducing_special_friend) << 7224 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7225 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7226 return 0; 7227 } 7228 } 7229 7230 bool Redeclaration = false; 7231 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7232 move(TemplateParams), 7233 IsDefinition, 7234 Redeclaration); 7235 if (!ND) return 0; 7236 7237 assert(ND->getDeclContext() == DC); 7238 assert(ND->getLexicalDeclContext() == CurContext); 7239 7240 // Add the function declaration to the appropriate lookup tables, 7241 // adjusting the redeclarations list as necessary. We don't 7242 // want to do this yet if the friending class is dependent. 7243 // 7244 // Also update the scope-based lookup if the target context's 7245 // lookup context is in lexical scope. 7246 if (!CurContext->isDependentContext()) { 7247 DC = DC->getRedeclContext(); 7248 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7249 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7250 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7251 } 7252 7253 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7254 D.getIdentifierLoc(), ND, 7255 DS.getFriendSpecLoc()); 7256 FrD->setAccess(AS_public); 7257 CurContext->addDecl(FrD); 7258 7259 if (ND->isInvalidDecl()) 7260 FrD->setInvalidDecl(); 7261 else { 7262 FunctionDecl *FD; 7263 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7264 FD = FTD->getTemplatedDecl(); 7265 else 7266 FD = cast<FunctionDecl>(ND); 7267 7268 // Mark templated-scope function declarations as unsupported. 7269 if (FD->getNumTemplateParameterLists()) 7270 FrD->setUnsupportedFriend(true); 7271 } 7272 7273 return ND; 7274} 7275 7276void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7277 AdjustDeclIfTemplate(Dcl); 7278 7279 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7280 if (!Fn) { 7281 Diag(DelLoc, diag::err_deleted_non_function); 7282 return; 7283 } 7284 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7285 Diag(DelLoc, diag::err_deleted_decl_not_first); 7286 Diag(Prev->getLocation(), diag::note_previous_declaration); 7287 // If the declaration wasn't the first, we delete the function anyway for 7288 // recovery. 7289 } 7290 Fn->setDeleted(); 7291} 7292 7293static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7294 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7295 Stmt *SubStmt = *CI; 7296 if (!SubStmt) 7297 continue; 7298 if (isa<ReturnStmt>(SubStmt)) 7299 Self.Diag(SubStmt->getSourceRange().getBegin(), 7300 diag::err_return_in_constructor_handler); 7301 if (!isa<Expr>(SubStmt)) 7302 SearchForReturnInStmt(Self, SubStmt); 7303 } 7304} 7305 7306void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7307 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7308 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7309 SearchForReturnInStmt(*this, Handler); 7310 } 7311} 7312 7313bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7314 const CXXMethodDecl *Old) { 7315 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7316 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7317 7318 if (Context.hasSameType(NewTy, OldTy) || 7319 NewTy->isDependentType() || OldTy->isDependentType()) 7320 return false; 7321 7322 // Check if the return types are covariant 7323 QualType NewClassTy, OldClassTy; 7324 7325 /// Both types must be pointers or references to classes. 7326 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7327 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7328 NewClassTy = NewPT->getPointeeType(); 7329 OldClassTy = OldPT->getPointeeType(); 7330 } 7331 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7332 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7333 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7334 NewClassTy = NewRT->getPointeeType(); 7335 OldClassTy = OldRT->getPointeeType(); 7336 } 7337 } 7338 } 7339 7340 // The return types aren't either both pointers or references to a class type. 7341 if (NewClassTy.isNull()) { 7342 Diag(New->getLocation(), 7343 diag::err_different_return_type_for_overriding_virtual_function) 7344 << New->getDeclName() << NewTy << OldTy; 7345 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7346 7347 return true; 7348 } 7349 7350 // C++ [class.virtual]p6: 7351 // If the return type of D::f differs from the return type of B::f, the 7352 // class type in the return type of D::f shall be complete at the point of 7353 // declaration of D::f or shall be the class type D. 7354 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7355 if (!RT->isBeingDefined() && 7356 RequireCompleteType(New->getLocation(), NewClassTy, 7357 PDiag(diag::err_covariant_return_incomplete) 7358 << New->getDeclName())) 7359 return true; 7360 } 7361 7362 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7363 // Check if the new class derives from the old class. 7364 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7365 Diag(New->getLocation(), 7366 diag::err_covariant_return_not_derived) 7367 << New->getDeclName() << NewTy << OldTy; 7368 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7369 return true; 7370 } 7371 7372 // Check if we the conversion from derived to base is valid. 7373 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7374 diag::err_covariant_return_inaccessible_base, 7375 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7376 // FIXME: Should this point to the return type? 7377 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7378 // FIXME: this note won't trigger for delayed access control 7379 // diagnostics, and it's impossible to get an undelayed error 7380 // here from access control during the original parse because 7381 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7382 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7383 return true; 7384 } 7385 } 7386 7387 // The qualifiers of the return types must be the same. 7388 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7389 Diag(New->getLocation(), 7390 diag::err_covariant_return_type_different_qualifications) 7391 << New->getDeclName() << NewTy << OldTy; 7392 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7393 return true; 7394 }; 7395 7396 7397 // The new class type must have the same or less qualifiers as the old type. 7398 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7399 Diag(New->getLocation(), 7400 diag::err_covariant_return_type_class_type_more_qualified) 7401 << New->getDeclName() << NewTy << OldTy; 7402 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7403 return true; 7404 }; 7405 7406 return false; 7407} 7408 7409/// \brief Mark the given method pure. 7410/// 7411/// \param Method the method to be marked pure. 7412/// 7413/// \param InitRange the source range that covers the "0" initializer. 7414bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7415 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7416 Method->setPure(); 7417 return false; 7418 } 7419 7420 if (!Method->isInvalidDecl()) 7421 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7422 << Method->getDeclName() << InitRange; 7423 return true; 7424} 7425 7426/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7427/// an initializer for the out-of-line declaration 'Dcl'. The scope 7428/// is a fresh scope pushed for just this purpose. 7429/// 7430/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7431/// static data member of class X, names should be looked up in the scope of 7432/// class X. 7433void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7434 // If there is no declaration, there was an error parsing it. 7435 if (D == 0) return; 7436 7437 // We should only get called for declarations with scope specifiers, like: 7438 // int foo::bar; 7439 assert(D->isOutOfLine()); 7440 EnterDeclaratorContext(S, D->getDeclContext()); 7441} 7442 7443/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7444/// initializer for the out-of-line declaration 'D'. 7445void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7446 // If there is no declaration, there was an error parsing it. 7447 if (D == 0) return; 7448 7449 assert(D->isOutOfLine()); 7450 ExitDeclaratorContext(S); 7451} 7452 7453/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7454/// C++ if/switch/while/for statement. 7455/// e.g: "if (int x = f()) {...}" 7456DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7457 // C++ 6.4p2: 7458 // The declarator shall not specify a function or an array. 7459 // The type-specifier-seq shall not contain typedef and shall not declare a 7460 // new class or enumeration. 7461 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7462 "Parser allowed 'typedef' as storage class of condition decl."); 7463 7464 TagDecl *OwnedTag = 0; 7465 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7466 QualType Ty = TInfo->getType(); 7467 7468 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7469 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7470 // would be created and CXXConditionDeclExpr wants a VarDecl. 7471 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7472 << D.getSourceRange(); 7473 return DeclResult(); 7474 } else if (OwnedTag && OwnedTag->isDefinition()) { 7475 // The type-specifier-seq shall not declare a new class or enumeration. 7476 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7477 } 7478 7479 Decl *Dcl = ActOnDeclarator(S, D); 7480 if (!Dcl) 7481 return DeclResult(); 7482 7483 return Dcl; 7484} 7485 7486void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7487 bool DefinitionRequired) { 7488 // Ignore any vtable uses in unevaluated operands or for classes that do 7489 // not have a vtable. 7490 if (!Class->isDynamicClass() || Class->isDependentContext() || 7491 CurContext->isDependentContext() || 7492 ExprEvalContexts.back().Context == Unevaluated) 7493 return; 7494 7495 // Try to insert this class into the map. 7496 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7497 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7498 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7499 if (!Pos.second) { 7500 // If we already had an entry, check to see if we are promoting this vtable 7501 // to required a definition. If so, we need to reappend to the VTableUses 7502 // list, since we may have already processed the first entry. 7503 if (DefinitionRequired && !Pos.first->second) { 7504 Pos.first->second = true; 7505 } else { 7506 // Otherwise, we can early exit. 7507 return; 7508 } 7509 } 7510 7511 // Local classes need to have their virtual members marked 7512 // immediately. For all other classes, we mark their virtual members 7513 // at the end of the translation unit. 7514 if (Class->isLocalClass()) 7515 MarkVirtualMembersReferenced(Loc, Class); 7516 else 7517 VTableUses.push_back(std::make_pair(Class, Loc)); 7518} 7519 7520bool Sema::DefineUsedVTables() { 7521 if (VTableUses.empty()) 7522 return false; 7523 7524 // Note: The VTableUses vector could grow as a result of marking 7525 // the members of a class as "used", so we check the size each 7526 // time through the loop and prefer indices (with are stable) to 7527 // iterators (which are not). 7528 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7529 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7530 if (!Class) 7531 continue; 7532 7533 SourceLocation Loc = VTableUses[I].second; 7534 7535 // If this class has a key function, but that key function is 7536 // defined in another translation unit, we don't need to emit the 7537 // vtable even though we're using it. 7538 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7539 if (KeyFunction && !KeyFunction->hasBody()) { 7540 switch (KeyFunction->getTemplateSpecializationKind()) { 7541 case TSK_Undeclared: 7542 case TSK_ExplicitSpecialization: 7543 case TSK_ExplicitInstantiationDeclaration: 7544 // The key function is in another translation unit. 7545 continue; 7546 7547 case TSK_ExplicitInstantiationDefinition: 7548 case TSK_ImplicitInstantiation: 7549 // We will be instantiating the key function. 7550 break; 7551 } 7552 } else if (!KeyFunction) { 7553 // If we have a class with no key function that is the subject 7554 // of an explicit instantiation declaration, suppress the 7555 // vtable; it will live with the explicit instantiation 7556 // definition. 7557 bool IsExplicitInstantiationDeclaration 7558 = Class->getTemplateSpecializationKind() 7559 == TSK_ExplicitInstantiationDeclaration; 7560 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7561 REnd = Class->redecls_end(); 7562 R != REnd; ++R) { 7563 TemplateSpecializationKind TSK 7564 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7565 if (TSK == TSK_ExplicitInstantiationDeclaration) 7566 IsExplicitInstantiationDeclaration = true; 7567 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7568 IsExplicitInstantiationDeclaration = false; 7569 break; 7570 } 7571 } 7572 7573 if (IsExplicitInstantiationDeclaration) 7574 continue; 7575 } 7576 7577 // Mark all of the virtual members of this class as referenced, so 7578 // that we can build a vtable. Then, tell the AST consumer that a 7579 // vtable for this class is required. 7580 MarkVirtualMembersReferenced(Loc, Class); 7581 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7582 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7583 7584 // Optionally warn if we're emitting a weak vtable. 7585 if (Class->getLinkage() == ExternalLinkage && 7586 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7587 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7588 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7589 } 7590 } 7591 VTableUses.clear(); 7592 7593 return true; 7594} 7595 7596void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7597 const CXXRecordDecl *RD) { 7598 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7599 e = RD->method_end(); i != e; ++i) { 7600 CXXMethodDecl *MD = *i; 7601 7602 // C++ [basic.def.odr]p2: 7603 // [...] A virtual member function is used if it is not pure. [...] 7604 if (MD->isVirtual() && !MD->isPure()) 7605 MarkDeclarationReferenced(Loc, MD); 7606 } 7607 7608 // Only classes that have virtual bases need a VTT. 7609 if (RD->getNumVBases() == 0) 7610 return; 7611 7612 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7613 e = RD->bases_end(); i != e; ++i) { 7614 const CXXRecordDecl *Base = 7615 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7616 if (Base->getNumVBases() == 0) 7617 continue; 7618 MarkVirtualMembersReferenced(Loc, Base); 7619 } 7620} 7621 7622/// SetIvarInitializers - This routine builds initialization ASTs for the 7623/// Objective-C implementation whose ivars need be initialized. 7624void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7625 if (!getLangOptions().CPlusPlus) 7626 return; 7627 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7628 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7629 CollectIvarsToConstructOrDestruct(OID, ivars); 7630 if (ivars.empty()) 7631 return; 7632 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7633 for (unsigned i = 0; i < ivars.size(); i++) { 7634 FieldDecl *Field = ivars[i]; 7635 if (Field->isInvalidDecl()) 7636 continue; 7637 7638 CXXCtorInitializer *Member; 7639 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7640 InitializationKind InitKind = 7641 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7642 7643 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7644 ExprResult MemberInit = 7645 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7646 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7647 // Note, MemberInit could actually come back empty if no initialization 7648 // is required (e.g., because it would call a trivial default constructor) 7649 if (!MemberInit.get() || MemberInit.isInvalid()) 7650 continue; 7651 7652 Member = 7653 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7654 SourceLocation(), 7655 MemberInit.takeAs<Expr>(), 7656 SourceLocation()); 7657 AllToInit.push_back(Member); 7658 7659 // Be sure that the destructor is accessible and is marked as referenced. 7660 if (const RecordType *RecordTy 7661 = Context.getBaseElementType(Field->getType()) 7662 ->getAs<RecordType>()) { 7663 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7664 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7665 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7666 CheckDestructorAccess(Field->getLocation(), Destructor, 7667 PDiag(diag::err_access_dtor_ivar) 7668 << Context.getBaseElementType(Field->getType())); 7669 } 7670 } 7671 } 7672 ObjCImplementation->setIvarInitializers(Context, 7673 AllToInit.data(), AllToInit.size()); 7674 } 7675} 7676