SemaDeclCXX.cpp revision c54061a679d8db4169438b2f97f81e3f443c6a25
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 if (!(*M)->isStatic()) 2842 DiagnoseHiddenVirtualMethods(Record, *M); 2843 } 2844 } 2845 2846 // Declare inherited constructors. We do this eagerly here because: 2847 // - The standard requires an eager diagnostic for conflicting inherited 2848 // constructors from different classes. 2849 // - The lazy declaration of the other implicit constructors is so as to not 2850 // waste space and performance on classes that are not meant to be 2851 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2852 // have inherited constructors. 2853 DeclareInheritedConstructors(Record); 2854} 2855 2856/// \brief Data used with FindHiddenVirtualMethod 2857namespace { 2858 struct FindHiddenVirtualMethodData { 2859 Sema *S; 2860 CXXMethodDecl *Method; 2861 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2862 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2863 }; 2864} 2865 2866/// \brief Member lookup function that determines whether a given C++ 2867/// method overloads virtual methods in a base class without overriding any, 2868/// to be used with CXXRecordDecl::lookupInBases(). 2869static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2870 CXXBasePath &Path, 2871 void *UserData) { 2872 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2873 2874 FindHiddenVirtualMethodData &Data 2875 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2876 2877 DeclarationName Name = Data.Method->getDeclName(); 2878 assert(Name.getNameKind() == DeclarationName::Identifier); 2879 2880 bool foundSameNameMethod = false; 2881 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2882 for (Path.Decls = BaseRecord->lookup(Name); 2883 Path.Decls.first != Path.Decls.second; 2884 ++Path.Decls.first) { 2885 NamedDecl *D = *Path.Decls.first; 2886 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2887 MD = MD->getCanonicalDecl(); 2888 foundSameNameMethod = true; 2889 // Interested only in hidden virtual methods. 2890 if (!MD->isVirtual()) 2891 continue; 2892 // If the method we are checking overrides a method from its base 2893 // don't warn about the other overloaded methods. 2894 if (!Data.S->IsOverload(Data.Method, MD, false)) 2895 return true; 2896 // Collect the overload only if its hidden. 2897 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2898 overloadedMethods.push_back(MD); 2899 } 2900 } 2901 2902 if (foundSameNameMethod) 2903 Data.OverloadedMethods.append(overloadedMethods.begin(), 2904 overloadedMethods.end()); 2905 return foundSameNameMethod; 2906} 2907 2908/// \brief See if a method overloads virtual methods in a base class without 2909/// overriding any. 2910void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2911 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2912 MD->getLocation()) == Diagnostic::Ignored) 2913 return; 2914 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2915 return; 2916 2917 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2918 /*bool RecordPaths=*/false, 2919 /*bool DetectVirtual=*/false); 2920 FindHiddenVirtualMethodData Data; 2921 Data.Method = MD; 2922 Data.S = this; 2923 2924 // Keep the base methods that were overriden or introduced in the subclass 2925 // by 'using' in a set. A base method not in this set is hidden. 2926 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2927 res.first != res.second; ++res.first) { 2928 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2929 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2930 E = MD->end_overridden_methods(); 2931 I != E; ++I) 2932 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2933 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2934 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2935 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2936 } 2937 2938 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2939 !Data.OverloadedMethods.empty()) { 2940 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2941 << MD << (Data.OverloadedMethods.size() > 1); 2942 2943 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2944 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2945 Diag(overloadedMD->getLocation(), 2946 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2947 } 2948 } 2949} 2950 2951void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2952 Decl *TagDecl, 2953 SourceLocation LBrac, 2954 SourceLocation RBrac, 2955 AttributeList *AttrList) { 2956 if (!TagDecl) 2957 return; 2958 2959 AdjustDeclIfTemplate(TagDecl); 2960 2961 ActOnFields(S, RLoc, TagDecl, 2962 // strict aliasing violation! 2963 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2964 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2965 2966 CheckCompletedCXXClass( 2967 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2968} 2969 2970namespace { 2971 /// \brief Helper class that collects exception specifications for 2972 /// implicitly-declared special member functions. 2973 class ImplicitExceptionSpecification { 2974 ASTContext &Context; 2975 bool AllowsAllExceptions; 2976 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2977 llvm::SmallVector<QualType, 4> Exceptions; 2978 2979 public: 2980 explicit ImplicitExceptionSpecification(ASTContext &Context) 2981 : Context(Context), AllowsAllExceptions(false) { } 2982 2983 /// \brief Whether the special member function should have any 2984 /// exception specification at all. 2985 bool hasExceptionSpecification() const { 2986 return !AllowsAllExceptions; 2987 } 2988 2989 /// \brief Whether the special member function should have a 2990 /// throw(...) exception specification (a Microsoft extension). 2991 bool hasAnyExceptionSpecification() const { 2992 return false; 2993 } 2994 2995 /// \brief The number of exceptions in the exception specification. 2996 unsigned size() const { return Exceptions.size(); } 2997 2998 /// \brief The set of exceptions in the exception specification. 2999 const QualType *data() const { return Exceptions.data(); } 3000 3001 /// \brief Note that 3002 void CalledDecl(CXXMethodDecl *Method) { 3003 // If we already know that we allow all exceptions, do nothing. 3004 if (AllowsAllExceptions || !Method) 3005 return; 3006 3007 const FunctionProtoType *Proto 3008 = Method->getType()->getAs<FunctionProtoType>(); 3009 3010 // If this function can throw any exceptions, make a note of that. 3011 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 3012 AllowsAllExceptions = true; 3013 ExceptionsSeen.clear(); 3014 Exceptions.clear(); 3015 return; 3016 } 3017 3018 // Record the exceptions in this function's exception specification. 3019 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3020 EEnd = Proto->exception_end(); 3021 E != EEnd; ++E) 3022 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3023 Exceptions.push_back(*E); 3024 } 3025 }; 3026} 3027 3028 3029/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3030/// special functions, such as the default constructor, copy 3031/// constructor, or destructor, to the given C++ class (C++ 3032/// [special]p1). This routine can only be executed just before the 3033/// definition of the class is complete. 3034void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3035 if (!ClassDecl->hasUserDeclaredConstructor()) 3036 ++ASTContext::NumImplicitDefaultConstructors; 3037 3038 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3039 ++ASTContext::NumImplicitCopyConstructors; 3040 3041 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3042 ++ASTContext::NumImplicitCopyAssignmentOperators; 3043 3044 // If we have a dynamic class, then the copy assignment operator may be 3045 // virtual, so we have to declare it immediately. This ensures that, e.g., 3046 // it shows up in the right place in the vtable and that we diagnose 3047 // problems with the implicit exception specification. 3048 if (ClassDecl->isDynamicClass()) 3049 DeclareImplicitCopyAssignment(ClassDecl); 3050 } 3051 3052 if (!ClassDecl->hasUserDeclaredDestructor()) { 3053 ++ASTContext::NumImplicitDestructors; 3054 3055 // If we have a dynamic class, then the destructor may be virtual, so we 3056 // have to declare the destructor immediately. This ensures that, e.g., it 3057 // shows up in the right place in the vtable and that we diagnose problems 3058 // with the implicit exception specification. 3059 if (ClassDecl->isDynamicClass()) 3060 DeclareImplicitDestructor(ClassDecl); 3061 } 3062} 3063 3064void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3065 if (!D) 3066 return; 3067 3068 TemplateParameterList *Params = 0; 3069 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3070 Params = Template->getTemplateParameters(); 3071 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3072 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3073 Params = PartialSpec->getTemplateParameters(); 3074 else 3075 return; 3076 3077 for (TemplateParameterList::iterator Param = Params->begin(), 3078 ParamEnd = Params->end(); 3079 Param != ParamEnd; ++Param) { 3080 NamedDecl *Named = cast<NamedDecl>(*Param); 3081 if (Named->getDeclName()) { 3082 S->AddDecl(Named); 3083 IdResolver.AddDecl(Named); 3084 } 3085 } 3086} 3087 3088void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3089 if (!RecordD) return; 3090 AdjustDeclIfTemplate(RecordD); 3091 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3092 PushDeclContext(S, Record); 3093} 3094 3095void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3096 if (!RecordD) return; 3097 PopDeclContext(); 3098} 3099 3100/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3101/// parsing a top-level (non-nested) C++ class, and we are now 3102/// parsing those parts of the given Method declaration that could 3103/// not be parsed earlier (C++ [class.mem]p2), such as default 3104/// arguments. This action should enter the scope of the given 3105/// Method declaration as if we had just parsed the qualified method 3106/// name. However, it should not bring the parameters into scope; 3107/// that will be performed by ActOnDelayedCXXMethodParameter. 3108void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3109} 3110 3111/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3112/// C++ method declaration. We're (re-)introducing the given 3113/// function parameter into scope for use in parsing later parts of 3114/// the method declaration. For example, we could see an 3115/// ActOnParamDefaultArgument event for this parameter. 3116void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3117 if (!ParamD) 3118 return; 3119 3120 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3121 3122 // If this parameter has an unparsed default argument, clear it out 3123 // to make way for the parsed default argument. 3124 if (Param->hasUnparsedDefaultArg()) 3125 Param->setDefaultArg(0); 3126 3127 S->AddDecl(Param); 3128 if (Param->getDeclName()) 3129 IdResolver.AddDecl(Param); 3130} 3131 3132/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3133/// processing the delayed method declaration for Method. The method 3134/// declaration is now considered finished. There may be a separate 3135/// ActOnStartOfFunctionDef action later (not necessarily 3136/// immediately!) for this method, if it was also defined inside the 3137/// class body. 3138void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3139 if (!MethodD) 3140 return; 3141 3142 AdjustDeclIfTemplate(MethodD); 3143 3144 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3145 3146 // Now that we have our default arguments, check the constructor 3147 // again. It could produce additional diagnostics or affect whether 3148 // the class has implicitly-declared destructors, among other 3149 // things. 3150 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3151 CheckConstructor(Constructor); 3152 3153 // Check the default arguments, which we may have added. 3154 if (!Method->isInvalidDecl()) 3155 CheckCXXDefaultArguments(Method); 3156} 3157 3158/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3159/// the well-formedness of the constructor declarator @p D with type @p 3160/// R. If there are any errors in the declarator, this routine will 3161/// emit diagnostics and set the invalid bit to true. In any case, the type 3162/// will be updated to reflect a well-formed type for the constructor and 3163/// returned. 3164QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3165 StorageClass &SC) { 3166 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3167 3168 // C++ [class.ctor]p3: 3169 // A constructor shall not be virtual (10.3) or static (9.4). A 3170 // constructor can be invoked for a const, volatile or const 3171 // volatile object. A constructor shall not be declared const, 3172 // volatile, or const volatile (9.3.2). 3173 if (isVirtual) { 3174 if (!D.isInvalidType()) 3175 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3176 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3177 << SourceRange(D.getIdentifierLoc()); 3178 D.setInvalidType(); 3179 } 3180 if (SC == SC_Static) { 3181 if (!D.isInvalidType()) 3182 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3183 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3184 << SourceRange(D.getIdentifierLoc()); 3185 D.setInvalidType(); 3186 SC = SC_None; 3187 } 3188 3189 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3190 if (FTI.TypeQuals != 0) { 3191 if (FTI.TypeQuals & Qualifiers::Const) 3192 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3193 << "const" << SourceRange(D.getIdentifierLoc()); 3194 if (FTI.TypeQuals & Qualifiers::Volatile) 3195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3196 << "volatile" << SourceRange(D.getIdentifierLoc()); 3197 if (FTI.TypeQuals & Qualifiers::Restrict) 3198 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3199 << "restrict" << SourceRange(D.getIdentifierLoc()); 3200 D.setInvalidType(); 3201 } 3202 3203 // C++0x [class.ctor]p4: 3204 // A constructor shall not be declared with a ref-qualifier. 3205 if (FTI.hasRefQualifier()) { 3206 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3207 << FTI.RefQualifierIsLValueRef 3208 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3209 D.setInvalidType(); 3210 } 3211 3212 // Rebuild the function type "R" without any type qualifiers (in 3213 // case any of the errors above fired) and with "void" as the 3214 // return type, since constructors don't have return types. 3215 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3216 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3217 return R; 3218 3219 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3220 EPI.TypeQuals = 0; 3221 EPI.RefQualifier = RQ_None; 3222 3223 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3224 Proto->getNumArgs(), EPI); 3225} 3226 3227/// CheckConstructor - Checks a fully-formed constructor for 3228/// well-formedness, issuing any diagnostics required. Returns true if 3229/// the constructor declarator is invalid. 3230void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3231 CXXRecordDecl *ClassDecl 3232 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3233 if (!ClassDecl) 3234 return Constructor->setInvalidDecl(); 3235 3236 // C++ [class.copy]p3: 3237 // A declaration of a constructor for a class X is ill-formed if 3238 // its first parameter is of type (optionally cv-qualified) X and 3239 // either there are no other parameters or else all other 3240 // parameters have default arguments. 3241 if (!Constructor->isInvalidDecl() && 3242 ((Constructor->getNumParams() == 1) || 3243 (Constructor->getNumParams() > 1 && 3244 Constructor->getParamDecl(1)->hasDefaultArg())) && 3245 Constructor->getTemplateSpecializationKind() 3246 != TSK_ImplicitInstantiation) { 3247 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3248 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3249 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3250 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3251 const char *ConstRef 3252 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3253 : " const &"; 3254 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3255 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3256 3257 // FIXME: Rather that making the constructor invalid, we should endeavor 3258 // to fix the type. 3259 Constructor->setInvalidDecl(); 3260 } 3261 } 3262} 3263 3264/// CheckDestructor - Checks a fully-formed destructor definition for 3265/// well-formedness, issuing any diagnostics required. Returns true 3266/// on error. 3267bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3268 CXXRecordDecl *RD = Destructor->getParent(); 3269 3270 if (Destructor->isVirtual()) { 3271 SourceLocation Loc; 3272 3273 if (!Destructor->isImplicit()) 3274 Loc = Destructor->getLocation(); 3275 else 3276 Loc = RD->getLocation(); 3277 3278 // If we have a virtual destructor, look up the deallocation function 3279 FunctionDecl *OperatorDelete = 0; 3280 DeclarationName Name = 3281 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3282 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3283 return true; 3284 3285 MarkDeclarationReferenced(Loc, OperatorDelete); 3286 3287 Destructor->setOperatorDelete(OperatorDelete); 3288 } 3289 3290 return false; 3291} 3292 3293static inline bool 3294FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3295 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3296 FTI.ArgInfo[0].Param && 3297 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3298} 3299 3300/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3301/// the well-formednes of the destructor declarator @p D with type @p 3302/// R. If there are any errors in the declarator, this routine will 3303/// emit diagnostics and set the declarator to invalid. Even if this happens, 3304/// will be updated to reflect a well-formed type for the destructor and 3305/// returned. 3306QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3307 StorageClass& SC) { 3308 // C++ [class.dtor]p1: 3309 // [...] A typedef-name that names a class is a class-name 3310 // (7.1.3); however, a typedef-name that names a class shall not 3311 // be used as the identifier in the declarator for a destructor 3312 // declaration. 3313 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3314 if (isa<TypedefType>(DeclaratorType)) 3315 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3316 << DeclaratorType; 3317 3318 // C++ [class.dtor]p2: 3319 // A destructor is used to destroy objects of its class type. A 3320 // destructor takes no parameters, and no return type can be 3321 // specified for it (not even void). The address of a destructor 3322 // shall not be taken. A destructor shall not be static. A 3323 // destructor can be invoked for a const, volatile or const 3324 // volatile object. A destructor shall not be declared const, 3325 // volatile or const volatile (9.3.2). 3326 if (SC == SC_Static) { 3327 if (!D.isInvalidType()) 3328 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3329 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3330 << SourceRange(D.getIdentifierLoc()) 3331 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3332 3333 SC = SC_None; 3334 } 3335 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3336 // Destructors don't have return types, but the parser will 3337 // happily parse something like: 3338 // 3339 // class X { 3340 // float ~X(); 3341 // }; 3342 // 3343 // The return type will be eliminated later. 3344 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3345 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3346 << SourceRange(D.getIdentifierLoc()); 3347 } 3348 3349 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3350 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3351 if (FTI.TypeQuals & Qualifiers::Const) 3352 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3353 << "const" << SourceRange(D.getIdentifierLoc()); 3354 if (FTI.TypeQuals & Qualifiers::Volatile) 3355 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3356 << "volatile" << SourceRange(D.getIdentifierLoc()); 3357 if (FTI.TypeQuals & Qualifiers::Restrict) 3358 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3359 << "restrict" << SourceRange(D.getIdentifierLoc()); 3360 D.setInvalidType(); 3361 } 3362 3363 // C++0x [class.dtor]p2: 3364 // A destructor shall not be declared with a ref-qualifier. 3365 if (FTI.hasRefQualifier()) { 3366 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3367 << FTI.RefQualifierIsLValueRef 3368 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3369 D.setInvalidType(); 3370 } 3371 3372 // Make sure we don't have any parameters. 3373 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3374 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3375 3376 // Delete the parameters. 3377 FTI.freeArgs(); 3378 D.setInvalidType(); 3379 } 3380 3381 // Make sure the destructor isn't variadic. 3382 if (FTI.isVariadic) { 3383 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3384 D.setInvalidType(); 3385 } 3386 3387 // Rebuild the function type "R" without any type qualifiers or 3388 // parameters (in case any of the errors above fired) and with 3389 // "void" as the return type, since destructors don't have return 3390 // types. 3391 if (!D.isInvalidType()) 3392 return R; 3393 3394 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3395 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3396 EPI.Variadic = false; 3397 EPI.TypeQuals = 0; 3398 EPI.RefQualifier = RQ_None; 3399 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3400} 3401 3402/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3403/// well-formednes of the conversion function declarator @p D with 3404/// type @p R. If there are any errors in the declarator, this routine 3405/// will emit diagnostics and return true. Otherwise, it will return 3406/// false. Either way, the type @p R will be updated to reflect a 3407/// well-formed type for the conversion operator. 3408void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3409 StorageClass& SC) { 3410 // C++ [class.conv.fct]p1: 3411 // Neither parameter types nor return type can be specified. The 3412 // type of a conversion function (8.3.5) is "function taking no 3413 // parameter returning conversion-type-id." 3414 if (SC == SC_Static) { 3415 if (!D.isInvalidType()) 3416 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3417 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3418 << SourceRange(D.getIdentifierLoc()); 3419 D.setInvalidType(); 3420 SC = SC_None; 3421 } 3422 3423 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3424 3425 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3426 // Conversion functions don't have return types, but the parser will 3427 // happily parse something like: 3428 // 3429 // class X { 3430 // float operator bool(); 3431 // }; 3432 // 3433 // The return type will be changed later anyway. 3434 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3435 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3436 << SourceRange(D.getIdentifierLoc()); 3437 D.setInvalidType(); 3438 } 3439 3440 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3441 3442 // Make sure we don't have any parameters. 3443 if (Proto->getNumArgs() > 0) { 3444 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3445 3446 // Delete the parameters. 3447 D.getFunctionTypeInfo().freeArgs(); 3448 D.setInvalidType(); 3449 } else if (Proto->isVariadic()) { 3450 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3451 D.setInvalidType(); 3452 } 3453 3454 // Diagnose "&operator bool()" and other such nonsense. This 3455 // is actually a gcc extension which we don't support. 3456 if (Proto->getResultType() != ConvType) { 3457 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3458 << Proto->getResultType(); 3459 D.setInvalidType(); 3460 ConvType = Proto->getResultType(); 3461 } 3462 3463 // C++ [class.conv.fct]p4: 3464 // The conversion-type-id shall not represent a function type nor 3465 // an array type. 3466 if (ConvType->isArrayType()) { 3467 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3468 ConvType = Context.getPointerType(ConvType); 3469 D.setInvalidType(); 3470 } else if (ConvType->isFunctionType()) { 3471 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3472 ConvType = Context.getPointerType(ConvType); 3473 D.setInvalidType(); 3474 } 3475 3476 // Rebuild the function type "R" without any parameters (in case any 3477 // of the errors above fired) and with the conversion type as the 3478 // return type. 3479 if (D.isInvalidType()) 3480 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3481 3482 // C++0x explicit conversion operators. 3483 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3484 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3485 diag::warn_explicit_conversion_functions) 3486 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3487} 3488 3489/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3490/// the declaration of the given C++ conversion function. This routine 3491/// is responsible for recording the conversion function in the C++ 3492/// class, if possible. 3493Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3494 assert(Conversion && "Expected to receive a conversion function declaration"); 3495 3496 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3497 3498 // Make sure we aren't redeclaring the conversion function. 3499 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3500 3501 // C++ [class.conv.fct]p1: 3502 // [...] A conversion function is never used to convert a 3503 // (possibly cv-qualified) object to the (possibly cv-qualified) 3504 // same object type (or a reference to it), to a (possibly 3505 // cv-qualified) base class of that type (or a reference to it), 3506 // or to (possibly cv-qualified) void. 3507 // FIXME: Suppress this warning if the conversion function ends up being a 3508 // virtual function that overrides a virtual function in a base class. 3509 QualType ClassType 3510 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3511 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3512 ConvType = ConvTypeRef->getPointeeType(); 3513 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3514 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3515 /* Suppress diagnostics for instantiations. */; 3516 else if (ConvType->isRecordType()) { 3517 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3518 if (ConvType == ClassType) 3519 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3520 << ClassType; 3521 else if (IsDerivedFrom(ClassType, ConvType)) 3522 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3523 << ClassType << ConvType; 3524 } else if (ConvType->isVoidType()) { 3525 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3526 << ClassType << ConvType; 3527 } 3528 3529 if (FunctionTemplateDecl *ConversionTemplate 3530 = Conversion->getDescribedFunctionTemplate()) 3531 return ConversionTemplate; 3532 3533 return Conversion; 3534} 3535 3536//===----------------------------------------------------------------------===// 3537// Namespace Handling 3538//===----------------------------------------------------------------------===// 3539 3540 3541 3542/// ActOnStartNamespaceDef - This is called at the start of a namespace 3543/// definition. 3544Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3545 SourceLocation InlineLoc, 3546 SourceLocation IdentLoc, 3547 IdentifierInfo *II, 3548 SourceLocation LBrace, 3549 AttributeList *AttrList) { 3550 // anonymous namespace starts at its left brace 3551 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3552 (II ? IdentLoc : LBrace) , II); 3553 Namespc->setLBracLoc(LBrace); 3554 Namespc->setInline(InlineLoc.isValid()); 3555 3556 Scope *DeclRegionScope = NamespcScope->getParent(); 3557 3558 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3559 3560 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3561 PushNamespaceVisibilityAttr(Attr); 3562 3563 if (II) { 3564 // C++ [namespace.def]p2: 3565 // The identifier in an original-namespace-definition shall not 3566 // have been previously defined in the declarative region in 3567 // which the original-namespace-definition appears. The 3568 // identifier in an original-namespace-definition is the name of 3569 // the namespace. Subsequently in that declarative region, it is 3570 // treated as an original-namespace-name. 3571 // 3572 // Since namespace names are unique in their scope, and we don't 3573 // look through using directives, just 3574 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3575 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3576 3577 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3578 // This is an extended namespace definition. 3579 if (Namespc->isInline() != OrigNS->isInline()) { 3580 // inline-ness must match 3581 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3582 << Namespc->isInline(); 3583 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3584 Namespc->setInvalidDecl(); 3585 // Recover by ignoring the new namespace's inline status. 3586 Namespc->setInline(OrigNS->isInline()); 3587 } 3588 3589 // Attach this namespace decl to the chain of extended namespace 3590 // definitions. 3591 OrigNS->setNextNamespace(Namespc); 3592 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3593 3594 // Remove the previous declaration from the scope. 3595 if (DeclRegionScope->isDeclScope(OrigNS)) { 3596 IdResolver.RemoveDecl(OrigNS); 3597 DeclRegionScope->RemoveDecl(OrigNS); 3598 } 3599 } else if (PrevDecl) { 3600 // This is an invalid name redefinition. 3601 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3602 << Namespc->getDeclName(); 3603 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3604 Namespc->setInvalidDecl(); 3605 // Continue on to push Namespc as current DeclContext and return it. 3606 } else if (II->isStr("std") && 3607 CurContext->getRedeclContext()->isTranslationUnit()) { 3608 // This is the first "real" definition of the namespace "std", so update 3609 // our cache of the "std" namespace to point at this definition. 3610 if (NamespaceDecl *StdNS = getStdNamespace()) { 3611 // We had already defined a dummy namespace "std". Link this new 3612 // namespace definition to the dummy namespace "std". 3613 StdNS->setNextNamespace(Namespc); 3614 StdNS->setLocation(IdentLoc); 3615 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3616 } 3617 3618 // Make our StdNamespace cache point at the first real definition of the 3619 // "std" namespace. 3620 StdNamespace = Namespc; 3621 } 3622 3623 PushOnScopeChains(Namespc, DeclRegionScope); 3624 } else { 3625 // Anonymous namespaces. 3626 assert(Namespc->isAnonymousNamespace()); 3627 3628 // Link the anonymous namespace into its parent. 3629 NamespaceDecl *PrevDecl; 3630 DeclContext *Parent = CurContext->getRedeclContext(); 3631 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3632 PrevDecl = TU->getAnonymousNamespace(); 3633 TU->setAnonymousNamespace(Namespc); 3634 } else { 3635 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3636 PrevDecl = ND->getAnonymousNamespace(); 3637 ND->setAnonymousNamespace(Namespc); 3638 } 3639 3640 // Link the anonymous namespace with its previous declaration. 3641 if (PrevDecl) { 3642 assert(PrevDecl->isAnonymousNamespace()); 3643 assert(!PrevDecl->getNextNamespace()); 3644 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3645 PrevDecl->setNextNamespace(Namespc); 3646 3647 if (Namespc->isInline() != PrevDecl->isInline()) { 3648 // inline-ness must match 3649 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3650 << Namespc->isInline(); 3651 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3652 Namespc->setInvalidDecl(); 3653 // Recover by ignoring the new namespace's inline status. 3654 Namespc->setInline(PrevDecl->isInline()); 3655 } 3656 } 3657 3658 CurContext->addDecl(Namespc); 3659 3660 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3661 // behaves as if it were replaced by 3662 // namespace unique { /* empty body */ } 3663 // using namespace unique; 3664 // namespace unique { namespace-body } 3665 // where all occurrences of 'unique' in a translation unit are 3666 // replaced by the same identifier and this identifier differs 3667 // from all other identifiers in the entire program. 3668 3669 // We just create the namespace with an empty name and then add an 3670 // implicit using declaration, just like the standard suggests. 3671 // 3672 // CodeGen enforces the "universally unique" aspect by giving all 3673 // declarations semantically contained within an anonymous 3674 // namespace internal linkage. 3675 3676 if (!PrevDecl) { 3677 UsingDirectiveDecl* UD 3678 = UsingDirectiveDecl::Create(Context, CurContext, 3679 /* 'using' */ LBrace, 3680 /* 'namespace' */ SourceLocation(), 3681 /* qualifier */ NestedNameSpecifierLoc(), 3682 /* identifier */ SourceLocation(), 3683 Namespc, 3684 /* Ancestor */ CurContext); 3685 UD->setImplicit(); 3686 CurContext->addDecl(UD); 3687 } 3688 } 3689 3690 // Although we could have an invalid decl (i.e. the namespace name is a 3691 // redefinition), push it as current DeclContext and try to continue parsing. 3692 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3693 // for the namespace has the declarations that showed up in that particular 3694 // namespace definition. 3695 PushDeclContext(NamespcScope, Namespc); 3696 return Namespc; 3697} 3698 3699/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3700/// is a namespace alias, returns the namespace it points to. 3701static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3702 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3703 return AD->getNamespace(); 3704 return dyn_cast_or_null<NamespaceDecl>(D); 3705} 3706 3707/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3708/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3709void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3710 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3711 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3712 Namespc->setRBracLoc(RBrace); 3713 PopDeclContext(); 3714 if (Namespc->hasAttr<VisibilityAttr>()) 3715 PopPragmaVisibility(); 3716} 3717 3718CXXRecordDecl *Sema::getStdBadAlloc() const { 3719 return cast_or_null<CXXRecordDecl>( 3720 StdBadAlloc.get(Context.getExternalSource())); 3721} 3722 3723NamespaceDecl *Sema::getStdNamespace() const { 3724 return cast_or_null<NamespaceDecl>( 3725 StdNamespace.get(Context.getExternalSource())); 3726} 3727 3728/// \brief Retrieve the special "std" namespace, which may require us to 3729/// implicitly define the namespace. 3730NamespaceDecl *Sema::getOrCreateStdNamespace() { 3731 if (!StdNamespace) { 3732 // The "std" namespace has not yet been defined, so build one implicitly. 3733 StdNamespace = NamespaceDecl::Create(Context, 3734 Context.getTranslationUnitDecl(), 3735 SourceLocation(), 3736 &PP.getIdentifierTable().get("std")); 3737 getStdNamespace()->setImplicit(true); 3738 } 3739 3740 return getStdNamespace(); 3741} 3742 3743Decl *Sema::ActOnUsingDirective(Scope *S, 3744 SourceLocation UsingLoc, 3745 SourceLocation NamespcLoc, 3746 CXXScopeSpec &SS, 3747 SourceLocation IdentLoc, 3748 IdentifierInfo *NamespcName, 3749 AttributeList *AttrList) { 3750 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3751 assert(NamespcName && "Invalid NamespcName."); 3752 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3753 3754 // This can only happen along a recovery path. 3755 while (S->getFlags() & Scope::TemplateParamScope) 3756 S = S->getParent(); 3757 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3758 3759 UsingDirectiveDecl *UDir = 0; 3760 NestedNameSpecifier *Qualifier = 0; 3761 if (SS.isSet()) 3762 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3763 3764 // Lookup namespace name. 3765 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3766 LookupParsedName(R, S, &SS); 3767 if (R.isAmbiguous()) 3768 return 0; 3769 3770 if (R.empty()) { 3771 // Allow "using namespace std;" or "using namespace ::std;" even if 3772 // "std" hasn't been defined yet, for GCC compatibility. 3773 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3774 NamespcName->isStr("std")) { 3775 Diag(IdentLoc, diag::ext_using_undefined_std); 3776 R.addDecl(getOrCreateStdNamespace()); 3777 R.resolveKind(); 3778 } 3779 // Otherwise, attempt typo correction. 3780 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3781 CTC_NoKeywords, 0)) { 3782 if (R.getAsSingle<NamespaceDecl>() || 3783 R.getAsSingle<NamespaceAliasDecl>()) { 3784 if (DeclContext *DC = computeDeclContext(SS, false)) 3785 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3786 << NamespcName << DC << Corrected << SS.getRange() 3787 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3788 else 3789 Diag(IdentLoc, diag::err_using_directive_suggest) 3790 << NamespcName << Corrected 3791 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3792 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3793 << Corrected; 3794 3795 NamespcName = Corrected.getAsIdentifierInfo(); 3796 } else { 3797 R.clear(); 3798 R.setLookupName(NamespcName); 3799 } 3800 } 3801 } 3802 3803 if (!R.empty()) { 3804 NamedDecl *Named = R.getFoundDecl(); 3805 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3806 && "expected namespace decl"); 3807 // C++ [namespace.udir]p1: 3808 // A using-directive specifies that the names in the nominated 3809 // namespace can be used in the scope in which the 3810 // using-directive appears after the using-directive. During 3811 // unqualified name lookup (3.4.1), the names appear as if they 3812 // were declared in the nearest enclosing namespace which 3813 // contains both the using-directive and the nominated 3814 // namespace. [Note: in this context, "contains" means "contains 3815 // directly or indirectly". ] 3816 3817 // Find enclosing context containing both using-directive and 3818 // nominated namespace. 3819 NamespaceDecl *NS = getNamespaceDecl(Named); 3820 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3821 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3822 CommonAncestor = CommonAncestor->getParent(); 3823 3824 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3825 SS.getWithLocInContext(Context), 3826 IdentLoc, Named, CommonAncestor); 3827 PushUsingDirective(S, UDir); 3828 } else { 3829 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3830 } 3831 3832 // FIXME: We ignore attributes for now. 3833 return UDir; 3834} 3835 3836void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3837 // If scope has associated entity, then using directive is at namespace 3838 // or translation unit scope. We add UsingDirectiveDecls, into 3839 // it's lookup structure. 3840 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3841 Ctx->addDecl(UDir); 3842 else 3843 // Otherwise it is block-sope. using-directives will affect lookup 3844 // only to the end of scope. 3845 S->PushUsingDirective(UDir); 3846} 3847 3848 3849Decl *Sema::ActOnUsingDeclaration(Scope *S, 3850 AccessSpecifier AS, 3851 bool HasUsingKeyword, 3852 SourceLocation UsingLoc, 3853 CXXScopeSpec &SS, 3854 UnqualifiedId &Name, 3855 AttributeList *AttrList, 3856 bool IsTypeName, 3857 SourceLocation TypenameLoc) { 3858 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3859 3860 switch (Name.getKind()) { 3861 case UnqualifiedId::IK_Identifier: 3862 case UnqualifiedId::IK_OperatorFunctionId: 3863 case UnqualifiedId::IK_LiteralOperatorId: 3864 case UnqualifiedId::IK_ConversionFunctionId: 3865 break; 3866 3867 case UnqualifiedId::IK_ConstructorName: 3868 case UnqualifiedId::IK_ConstructorTemplateId: 3869 // C++0x inherited constructors. 3870 if (getLangOptions().CPlusPlus0x) break; 3871 3872 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3873 << SS.getRange(); 3874 return 0; 3875 3876 case UnqualifiedId::IK_DestructorName: 3877 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3878 << SS.getRange(); 3879 return 0; 3880 3881 case UnqualifiedId::IK_TemplateId: 3882 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3883 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3884 return 0; 3885 } 3886 3887 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3888 DeclarationName TargetName = TargetNameInfo.getName(); 3889 if (!TargetName) 3890 return 0; 3891 3892 // Warn about using declarations. 3893 // TODO: store that the declaration was written without 'using' and 3894 // talk about access decls instead of using decls in the 3895 // diagnostics. 3896 if (!HasUsingKeyword) { 3897 UsingLoc = Name.getSourceRange().getBegin(); 3898 3899 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3900 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3901 } 3902 3903 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3904 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3905 return 0; 3906 3907 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3908 TargetNameInfo, AttrList, 3909 /* IsInstantiation */ false, 3910 IsTypeName, TypenameLoc); 3911 if (UD) 3912 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3913 3914 return UD; 3915} 3916 3917/// \brief Determine whether a using declaration considers the given 3918/// declarations as "equivalent", e.g., if they are redeclarations of 3919/// the same entity or are both typedefs of the same type. 3920static bool 3921IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3922 bool &SuppressRedeclaration) { 3923 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3924 SuppressRedeclaration = false; 3925 return true; 3926 } 3927 3928 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3929 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3930 SuppressRedeclaration = true; 3931 return Context.hasSameType(TD1->getUnderlyingType(), 3932 TD2->getUnderlyingType()); 3933 } 3934 3935 return false; 3936} 3937 3938 3939/// Determines whether to create a using shadow decl for a particular 3940/// decl, given the set of decls existing prior to this using lookup. 3941bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3942 const LookupResult &Previous) { 3943 // Diagnose finding a decl which is not from a base class of the 3944 // current class. We do this now because there are cases where this 3945 // function will silently decide not to build a shadow decl, which 3946 // will pre-empt further diagnostics. 3947 // 3948 // We don't need to do this in C++0x because we do the check once on 3949 // the qualifier. 3950 // 3951 // FIXME: diagnose the following if we care enough: 3952 // struct A { int foo; }; 3953 // struct B : A { using A::foo; }; 3954 // template <class T> struct C : A {}; 3955 // template <class T> struct D : C<T> { using B::foo; } // <--- 3956 // This is invalid (during instantiation) in C++03 because B::foo 3957 // resolves to the using decl in B, which is not a base class of D<T>. 3958 // We can't diagnose it immediately because C<T> is an unknown 3959 // specialization. The UsingShadowDecl in D<T> then points directly 3960 // to A::foo, which will look well-formed when we instantiate. 3961 // The right solution is to not collapse the shadow-decl chain. 3962 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3963 DeclContext *OrigDC = Orig->getDeclContext(); 3964 3965 // Handle enums and anonymous structs. 3966 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3967 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3968 while (OrigRec->isAnonymousStructOrUnion()) 3969 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3970 3971 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3972 if (OrigDC == CurContext) { 3973 Diag(Using->getLocation(), 3974 diag::err_using_decl_nested_name_specifier_is_current_class) 3975 << Using->getQualifierLoc().getSourceRange(); 3976 Diag(Orig->getLocation(), diag::note_using_decl_target); 3977 return true; 3978 } 3979 3980 Diag(Using->getQualifierLoc().getBeginLoc(), 3981 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3982 << Using->getQualifier() 3983 << cast<CXXRecordDecl>(CurContext) 3984 << Using->getQualifierLoc().getSourceRange(); 3985 Diag(Orig->getLocation(), diag::note_using_decl_target); 3986 return true; 3987 } 3988 } 3989 3990 if (Previous.empty()) return false; 3991 3992 NamedDecl *Target = Orig; 3993 if (isa<UsingShadowDecl>(Target)) 3994 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3995 3996 // If the target happens to be one of the previous declarations, we 3997 // don't have a conflict. 3998 // 3999 // FIXME: but we might be increasing its access, in which case we 4000 // should redeclare it. 4001 NamedDecl *NonTag = 0, *Tag = 0; 4002 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4003 I != E; ++I) { 4004 NamedDecl *D = (*I)->getUnderlyingDecl(); 4005 bool Result; 4006 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4007 return Result; 4008 4009 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4010 } 4011 4012 if (Target->isFunctionOrFunctionTemplate()) { 4013 FunctionDecl *FD; 4014 if (isa<FunctionTemplateDecl>(Target)) 4015 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4016 else 4017 FD = cast<FunctionDecl>(Target); 4018 4019 NamedDecl *OldDecl = 0; 4020 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4021 case Ovl_Overload: 4022 return false; 4023 4024 case Ovl_NonFunction: 4025 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4026 break; 4027 4028 // We found a decl with the exact signature. 4029 case Ovl_Match: 4030 // If we're in a record, we want to hide the target, so we 4031 // return true (without a diagnostic) to tell the caller not to 4032 // build a shadow decl. 4033 if (CurContext->isRecord()) 4034 return true; 4035 4036 // If we're not in a record, this is an error. 4037 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4038 break; 4039 } 4040 4041 Diag(Target->getLocation(), diag::note_using_decl_target); 4042 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4043 return true; 4044 } 4045 4046 // Target is not a function. 4047 4048 if (isa<TagDecl>(Target)) { 4049 // No conflict between a tag and a non-tag. 4050 if (!Tag) return false; 4051 4052 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4053 Diag(Target->getLocation(), diag::note_using_decl_target); 4054 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4055 return true; 4056 } 4057 4058 // No conflict between a tag and a non-tag. 4059 if (!NonTag) return false; 4060 4061 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4062 Diag(Target->getLocation(), diag::note_using_decl_target); 4063 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4064 return true; 4065} 4066 4067/// Builds a shadow declaration corresponding to a 'using' declaration. 4068UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4069 UsingDecl *UD, 4070 NamedDecl *Orig) { 4071 4072 // If we resolved to another shadow declaration, just coalesce them. 4073 NamedDecl *Target = Orig; 4074 if (isa<UsingShadowDecl>(Target)) { 4075 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4076 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4077 } 4078 4079 UsingShadowDecl *Shadow 4080 = UsingShadowDecl::Create(Context, CurContext, 4081 UD->getLocation(), UD, Target); 4082 UD->addShadowDecl(Shadow); 4083 4084 Shadow->setAccess(UD->getAccess()); 4085 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4086 Shadow->setInvalidDecl(); 4087 4088 if (S) 4089 PushOnScopeChains(Shadow, S); 4090 else 4091 CurContext->addDecl(Shadow); 4092 4093 4094 return Shadow; 4095} 4096 4097/// Hides a using shadow declaration. This is required by the current 4098/// using-decl implementation when a resolvable using declaration in a 4099/// class is followed by a declaration which would hide or override 4100/// one or more of the using decl's targets; for example: 4101/// 4102/// struct Base { void foo(int); }; 4103/// struct Derived : Base { 4104/// using Base::foo; 4105/// void foo(int); 4106/// }; 4107/// 4108/// The governing language is C++03 [namespace.udecl]p12: 4109/// 4110/// When a using-declaration brings names from a base class into a 4111/// derived class scope, member functions in the derived class 4112/// override and/or hide member functions with the same name and 4113/// parameter types in a base class (rather than conflicting). 4114/// 4115/// There are two ways to implement this: 4116/// (1) optimistically create shadow decls when they're not hidden 4117/// by existing declarations, or 4118/// (2) don't create any shadow decls (or at least don't make them 4119/// visible) until we've fully parsed/instantiated the class. 4120/// The problem with (1) is that we might have to retroactively remove 4121/// a shadow decl, which requires several O(n) operations because the 4122/// decl structures are (very reasonably) not designed for removal. 4123/// (2) avoids this but is very fiddly and phase-dependent. 4124void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4125 if (Shadow->getDeclName().getNameKind() == 4126 DeclarationName::CXXConversionFunctionName) 4127 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4128 4129 // Remove it from the DeclContext... 4130 Shadow->getDeclContext()->removeDecl(Shadow); 4131 4132 // ...and the scope, if applicable... 4133 if (S) { 4134 S->RemoveDecl(Shadow); 4135 IdResolver.RemoveDecl(Shadow); 4136 } 4137 4138 // ...and the using decl. 4139 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4140 4141 // TODO: complain somehow if Shadow was used. It shouldn't 4142 // be possible for this to happen, because...? 4143} 4144 4145/// Builds a using declaration. 4146/// 4147/// \param IsInstantiation - Whether this call arises from an 4148/// instantiation of an unresolved using declaration. We treat 4149/// the lookup differently for these declarations. 4150NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4151 SourceLocation UsingLoc, 4152 CXXScopeSpec &SS, 4153 const DeclarationNameInfo &NameInfo, 4154 AttributeList *AttrList, 4155 bool IsInstantiation, 4156 bool IsTypeName, 4157 SourceLocation TypenameLoc) { 4158 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4159 SourceLocation IdentLoc = NameInfo.getLoc(); 4160 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4161 4162 // FIXME: We ignore attributes for now. 4163 4164 if (SS.isEmpty()) { 4165 Diag(IdentLoc, diag::err_using_requires_qualname); 4166 return 0; 4167 } 4168 4169 // Do the redeclaration lookup in the current scope. 4170 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4171 ForRedeclaration); 4172 Previous.setHideTags(false); 4173 if (S) { 4174 LookupName(Previous, S); 4175 4176 // It is really dumb that we have to do this. 4177 LookupResult::Filter F = Previous.makeFilter(); 4178 while (F.hasNext()) { 4179 NamedDecl *D = F.next(); 4180 if (!isDeclInScope(D, CurContext, S)) 4181 F.erase(); 4182 } 4183 F.done(); 4184 } else { 4185 assert(IsInstantiation && "no scope in non-instantiation"); 4186 assert(CurContext->isRecord() && "scope not record in instantiation"); 4187 LookupQualifiedName(Previous, CurContext); 4188 } 4189 4190 // Check for invalid redeclarations. 4191 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4192 return 0; 4193 4194 // Check for bad qualifiers. 4195 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4196 return 0; 4197 4198 DeclContext *LookupContext = computeDeclContext(SS); 4199 NamedDecl *D; 4200 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4201 if (!LookupContext) { 4202 if (IsTypeName) { 4203 // FIXME: not all declaration name kinds are legal here 4204 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4205 UsingLoc, TypenameLoc, 4206 QualifierLoc, 4207 IdentLoc, NameInfo.getName()); 4208 } else { 4209 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4210 QualifierLoc, NameInfo); 4211 } 4212 } else { 4213 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4214 NameInfo, IsTypeName); 4215 } 4216 D->setAccess(AS); 4217 CurContext->addDecl(D); 4218 4219 if (!LookupContext) return D; 4220 UsingDecl *UD = cast<UsingDecl>(D); 4221 4222 if (RequireCompleteDeclContext(SS, LookupContext)) { 4223 UD->setInvalidDecl(); 4224 return UD; 4225 } 4226 4227 // Constructor inheriting using decls get special treatment. 4228 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4229 if (CheckInheritedConstructorUsingDecl(UD)) 4230 UD->setInvalidDecl(); 4231 return UD; 4232 } 4233 4234 // Otherwise, look up the target name. 4235 4236 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4237 4238 // Unlike most lookups, we don't always want to hide tag 4239 // declarations: tag names are visible through the using declaration 4240 // even if hidden by ordinary names, *except* in a dependent context 4241 // where it's important for the sanity of two-phase lookup. 4242 if (!IsInstantiation) 4243 R.setHideTags(false); 4244 4245 LookupQualifiedName(R, LookupContext); 4246 4247 if (R.empty()) { 4248 Diag(IdentLoc, diag::err_no_member) 4249 << NameInfo.getName() << LookupContext << SS.getRange(); 4250 UD->setInvalidDecl(); 4251 return UD; 4252 } 4253 4254 if (R.isAmbiguous()) { 4255 UD->setInvalidDecl(); 4256 return UD; 4257 } 4258 4259 if (IsTypeName) { 4260 // If we asked for a typename and got a non-type decl, error out. 4261 if (!R.getAsSingle<TypeDecl>()) { 4262 Diag(IdentLoc, diag::err_using_typename_non_type); 4263 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4264 Diag((*I)->getUnderlyingDecl()->getLocation(), 4265 diag::note_using_decl_target); 4266 UD->setInvalidDecl(); 4267 return UD; 4268 } 4269 } else { 4270 // If we asked for a non-typename and we got a type, error out, 4271 // but only if this is an instantiation of an unresolved using 4272 // decl. Otherwise just silently find the type name. 4273 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4274 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4275 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4276 UD->setInvalidDecl(); 4277 return UD; 4278 } 4279 } 4280 4281 // C++0x N2914 [namespace.udecl]p6: 4282 // A using-declaration shall not name a namespace. 4283 if (R.getAsSingle<NamespaceDecl>()) { 4284 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4285 << SS.getRange(); 4286 UD->setInvalidDecl(); 4287 return UD; 4288 } 4289 4290 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4291 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4292 BuildUsingShadowDecl(S, UD, *I); 4293 } 4294 4295 return UD; 4296} 4297 4298/// Additional checks for a using declaration referring to a constructor name. 4299bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4300 if (UD->isTypeName()) { 4301 // FIXME: Cannot specify typename when specifying constructor 4302 return true; 4303 } 4304 4305 const Type *SourceType = UD->getQualifier()->getAsType(); 4306 assert(SourceType && 4307 "Using decl naming constructor doesn't have type in scope spec."); 4308 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4309 4310 // Check whether the named type is a direct base class. 4311 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4312 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4313 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4314 BaseIt != BaseE; ++BaseIt) { 4315 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4316 if (CanonicalSourceType == BaseType) 4317 break; 4318 } 4319 4320 if (BaseIt == BaseE) { 4321 // Did not find SourceType in the bases. 4322 Diag(UD->getUsingLocation(), 4323 diag::err_using_decl_constructor_not_in_direct_base) 4324 << UD->getNameInfo().getSourceRange() 4325 << QualType(SourceType, 0) << TargetClass; 4326 return true; 4327 } 4328 4329 BaseIt->setInheritConstructors(); 4330 4331 return false; 4332} 4333 4334/// Checks that the given using declaration is not an invalid 4335/// redeclaration. Note that this is checking only for the using decl 4336/// itself, not for any ill-formedness among the UsingShadowDecls. 4337bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4338 bool isTypeName, 4339 const CXXScopeSpec &SS, 4340 SourceLocation NameLoc, 4341 const LookupResult &Prev) { 4342 // C++03 [namespace.udecl]p8: 4343 // C++0x [namespace.udecl]p10: 4344 // A using-declaration is a declaration and can therefore be used 4345 // repeatedly where (and only where) multiple declarations are 4346 // allowed. 4347 // 4348 // That's in non-member contexts. 4349 if (!CurContext->getRedeclContext()->isRecord()) 4350 return false; 4351 4352 NestedNameSpecifier *Qual 4353 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4354 4355 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4356 NamedDecl *D = *I; 4357 4358 bool DTypename; 4359 NestedNameSpecifier *DQual; 4360 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4361 DTypename = UD->isTypeName(); 4362 DQual = UD->getQualifier(); 4363 } else if (UnresolvedUsingValueDecl *UD 4364 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4365 DTypename = false; 4366 DQual = UD->getQualifier(); 4367 } else if (UnresolvedUsingTypenameDecl *UD 4368 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4369 DTypename = true; 4370 DQual = UD->getQualifier(); 4371 } else continue; 4372 4373 // using decls differ if one says 'typename' and the other doesn't. 4374 // FIXME: non-dependent using decls? 4375 if (isTypeName != DTypename) continue; 4376 4377 // using decls differ if they name different scopes (but note that 4378 // template instantiation can cause this check to trigger when it 4379 // didn't before instantiation). 4380 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4381 Context.getCanonicalNestedNameSpecifier(DQual)) 4382 continue; 4383 4384 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4385 Diag(D->getLocation(), diag::note_using_decl) << 1; 4386 return true; 4387 } 4388 4389 return false; 4390} 4391 4392 4393/// Checks that the given nested-name qualifier used in a using decl 4394/// in the current context is appropriately related to the current 4395/// scope. If an error is found, diagnoses it and returns true. 4396bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4397 const CXXScopeSpec &SS, 4398 SourceLocation NameLoc) { 4399 DeclContext *NamedContext = computeDeclContext(SS); 4400 4401 if (!CurContext->isRecord()) { 4402 // C++03 [namespace.udecl]p3: 4403 // C++0x [namespace.udecl]p8: 4404 // A using-declaration for a class member shall be a member-declaration. 4405 4406 // If we weren't able to compute a valid scope, it must be a 4407 // dependent class scope. 4408 if (!NamedContext || NamedContext->isRecord()) { 4409 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4410 << SS.getRange(); 4411 return true; 4412 } 4413 4414 // Otherwise, everything is known to be fine. 4415 return false; 4416 } 4417 4418 // The current scope is a record. 4419 4420 // If the named context is dependent, we can't decide much. 4421 if (!NamedContext) { 4422 // FIXME: in C++0x, we can diagnose if we can prove that the 4423 // nested-name-specifier does not refer to a base class, which is 4424 // still possible in some cases. 4425 4426 // Otherwise we have to conservatively report that things might be 4427 // okay. 4428 return false; 4429 } 4430 4431 if (!NamedContext->isRecord()) { 4432 // Ideally this would point at the last name in the specifier, 4433 // but we don't have that level of source info. 4434 Diag(SS.getRange().getBegin(), 4435 diag::err_using_decl_nested_name_specifier_is_not_class) 4436 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4437 return true; 4438 } 4439 4440 if (!NamedContext->isDependentContext() && 4441 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4442 return true; 4443 4444 if (getLangOptions().CPlusPlus0x) { 4445 // C++0x [namespace.udecl]p3: 4446 // In a using-declaration used as a member-declaration, the 4447 // nested-name-specifier shall name a base class of the class 4448 // being defined. 4449 4450 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4451 cast<CXXRecordDecl>(NamedContext))) { 4452 if (CurContext == NamedContext) { 4453 Diag(NameLoc, 4454 diag::err_using_decl_nested_name_specifier_is_current_class) 4455 << SS.getRange(); 4456 return true; 4457 } 4458 4459 Diag(SS.getRange().getBegin(), 4460 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4461 << (NestedNameSpecifier*) SS.getScopeRep() 4462 << cast<CXXRecordDecl>(CurContext) 4463 << SS.getRange(); 4464 return true; 4465 } 4466 4467 return false; 4468 } 4469 4470 // C++03 [namespace.udecl]p4: 4471 // A using-declaration used as a member-declaration shall refer 4472 // to a member of a base class of the class being defined [etc.]. 4473 4474 // Salient point: SS doesn't have to name a base class as long as 4475 // lookup only finds members from base classes. Therefore we can 4476 // diagnose here only if we can prove that that can't happen, 4477 // i.e. if the class hierarchies provably don't intersect. 4478 4479 // TODO: it would be nice if "definitely valid" results were cached 4480 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4481 // need to be repeated. 4482 4483 struct UserData { 4484 llvm::DenseSet<const CXXRecordDecl*> Bases; 4485 4486 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4487 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4488 Data->Bases.insert(Base); 4489 return true; 4490 } 4491 4492 bool hasDependentBases(const CXXRecordDecl *Class) { 4493 return !Class->forallBases(collect, this); 4494 } 4495 4496 /// Returns true if the base is dependent or is one of the 4497 /// accumulated base classes. 4498 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4499 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4500 return !Data->Bases.count(Base); 4501 } 4502 4503 bool mightShareBases(const CXXRecordDecl *Class) { 4504 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4505 } 4506 }; 4507 4508 UserData Data; 4509 4510 // Returns false if we find a dependent base. 4511 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4512 return false; 4513 4514 // Returns false if the class has a dependent base or if it or one 4515 // of its bases is present in the base set of the current context. 4516 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4517 return false; 4518 4519 Diag(SS.getRange().getBegin(), 4520 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4521 << (NestedNameSpecifier*) SS.getScopeRep() 4522 << cast<CXXRecordDecl>(CurContext) 4523 << SS.getRange(); 4524 4525 return true; 4526} 4527 4528Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4529 SourceLocation NamespaceLoc, 4530 SourceLocation AliasLoc, 4531 IdentifierInfo *Alias, 4532 CXXScopeSpec &SS, 4533 SourceLocation IdentLoc, 4534 IdentifierInfo *Ident) { 4535 4536 // Lookup the namespace name. 4537 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4538 LookupParsedName(R, S, &SS); 4539 4540 // Check if we have a previous declaration with the same name. 4541 NamedDecl *PrevDecl 4542 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4543 ForRedeclaration); 4544 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4545 PrevDecl = 0; 4546 4547 if (PrevDecl) { 4548 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4549 // We already have an alias with the same name that points to the same 4550 // namespace, so don't create a new one. 4551 // FIXME: At some point, we'll want to create the (redundant) 4552 // declaration to maintain better source information. 4553 if (!R.isAmbiguous() && !R.empty() && 4554 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4555 return 0; 4556 } 4557 4558 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4559 diag::err_redefinition_different_kind; 4560 Diag(AliasLoc, DiagID) << Alias; 4561 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4562 return 0; 4563 } 4564 4565 if (R.isAmbiguous()) 4566 return 0; 4567 4568 if (R.empty()) { 4569 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4570 CTC_NoKeywords, 0)) { 4571 if (R.getAsSingle<NamespaceDecl>() || 4572 R.getAsSingle<NamespaceAliasDecl>()) { 4573 if (DeclContext *DC = computeDeclContext(SS, false)) 4574 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4575 << Ident << DC << Corrected << SS.getRange() 4576 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4577 else 4578 Diag(IdentLoc, diag::err_using_directive_suggest) 4579 << Ident << Corrected 4580 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4581 4582 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4583 << Corrected; 4584 4585 Ident = Corrected.getAsIdentifierInfo(); 4586 } else { 4587 R.clear(); 4588 R.setLookupName(Ident); 4589 } 4590 } 4591 4592 if (R.empty()) { 4593 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4594 return 0; 4595 } 4596 } 4597 4598 NamespaceAliasDecl *AliasDecl = 4599 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4600 Alias, SS.getWithLocInContext(Context), 4601 IdentLoc, R.getFoundDecl()); 4602 4603 PushOnScopeChains(AliasDecl, S); 4604 return AliasDecl; 4605} 4606 4607namespace { 4608 /// \brief Scoped object used to handle the state changes required in Sema 4609 /// to implicitly define the body of a C++ member function; 4610 class ImplicitlyDefinedFunctionScope { 4611 Sema &S; 4612 Sema::ContextRAII SavedContext; 4613 4614 public: 4615 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4616 : S(S), SavedContext(S, Method) 4617 { 4618 S.PushFunctionScope(); 4619 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4620 } 4621 4622 ~ImplicitlyDefinedFunctionScope() { 4623 S.PopExpressionEvaluationContext(); 4624 S.PopFunctionOrBlockScope(); 4625 } 4626 }; 4627} 4628 4629static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4630 CXXRecordDecl *D) { 4631 ASTContext &Context = Self.Context; 4632 QualType ClassType = Context.getTypeDeclType(D); 4633 DeclarationName ConstructorName 4634 = Context.DeclarationNames.getCXXConstructorName( 4635 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4636 4637 DeclContext::lookup_const_iterator Con, ConEnd; 4638 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4639 Con != ConEnd; ++Con) { 4640 // FIXME: In C++0x, a constructor template can be a default constructor. 4641 if (isa<FunctionTemplateDecl>(*Con)) 4642 continue; 4643 4644 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4645 if (Constructor->isDefaultConstructor()) 4646 return Constructor; 4647 } 4648 return 0; 4649} 4650 4651CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4652 CXXRecordDecl *ClassDecl) { 4653 // C++ [class.ctor]p5: 4654 // A default constructor for a class X is a constructor of class X 4655 // that can be called without an argument. If there is no 4656 // user-declared constructor for class X, a default constructor is 4657 // implicitly declared. An implicitly-declared default constructor 4658 // is an inline public member of its class. 4659 assert(!ClassDecl->hasUserDeclaredConstructor() && 4660 "Should not build implicit default constructor!"); 4661 4662 // C++ [except.spec]p14: 4663 // An implicitly declared special member function (Clause 12) shall have an 4664 // exception-specification. [...] 4665 ImplicitExceptionSpecification ExceptSpec(Context); 4666 4667 // Direct base-class destructors. 4668 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4669 BEnd = ClassDecl->bases_end(); 4670 B != BEnd; ++B) { 4671 if (B->isVirtual()) // Handled below. 4672 continue; 4673 4674 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4675 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4676 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4677 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4678 else if (CXXConstructorDecl *Constructor 4679 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4680 ExceptSpec.CalledDecl(Constructor); 4681 } 4682 } 4683 4684 // Virtual base-class destructors. 4685 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4686 BEnd = ClassDecl->vbases_end(); 4687 B != BEnd; ++B) { 4688 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4689 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4690 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4691 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4692 else if (CXXConstructorDecl *Constructor 4693 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4694 ExceptSpec.CalledDecl(Constructor); 4695 } 4696 } 4697 4698 // Field destructors. 4699 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4700 FEnd = ClassDecl->field_end(); 4701 F != FEnd; ++F) { 4702 if (const RecordType *RecordTy 4703 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4704 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4705 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4706 ExceptSpec.CalledDecl( 4707 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4708 else if (CXXConstructorDecl *Constructor 4709 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4710 ExceptSpec.CalledDecl(Constructor); 4711 } 4712 } 4713 4714 FunctionProtoType::ExtProtoInfo EPI; 4715 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4716 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4717 EPI.NumExceptions = ExceptSpec.size(); 4718 EPI.Exceptions = ExceptSpec.data(); 4719 4720 // Create the actual constructor declaration. 4721 CanQualType ClassType 4722 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4723 DeclarationName Name 4724 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4725 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4726 CXXConstructorDecl *DefaultCon 4727 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4728 Context.getFunctionType(Context.VoidTy, 4729 0, 0, EPI), 4730 /*TInfo=*/0, 4731 /*isExplicit=*/false, 4732 /*isInline=*/true, 4733 /*isImplicitlyDeclared=*/true); 4734 DefaultCon->setAccess(AS_public); 4735 DefaultCon->setImplicit(); 4736 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4737 4738 // Note that we have declared this constructor. 4739 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4740 4741 if (Scope *S = getScopeForContext(ClassDecl)) 4742 PushOnScopeChains(DefaultCon, S, false); 4743 ClassDecl->addDecl(DefaultCon); 4744 4745 return DefaultCon; 4746} 4747 4748void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4749 CXXConstructorDecl *Constructor) { 4750 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4751 !Constructor->isUsed(false)) && 4752 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4753 4754 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4755 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4756 4757 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4758 DiagnosticErrorTrap Trap(Diags); 4759 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4760 Trap.hasErrorOccurred()) { 4761 Diag(CurrentLocation, diag::note_member_synthesized_at) 4762 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4763 Constructor->setInvalidDecl(); 4764 return; 4765 } 4766 4767 SourceLocation Loc = Constructor->getLocation(); 4768 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4769 4770 Constructor->setUsed(); 4771 MarkVTableUsed(CurrentLocation, ClassDecl); 4772} 4773 4774void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4775 // We start with an initial pass over the base classes to collect those that 4776 // inherit constructors from. If there are none, we can forgo all further 4777 // processing. 4778 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4779 BasesVector BasesToInheritFrom; 4780 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4781 BaseE = ClassDecl->bases_end(); 4782 BaseIt != BaseE; ++BaseIt) { 4783 if (BaseIt->getInheritConstructors()) { 4784 QualType Base = BaseIt->getType(); 4785 if (Base->isDependentType()) { 4786 // If we inherit constructors from anything that is dependent, just 4787 // abort processing altogether. We'll get another chance for the 4788 // instantiations. 4789 return; 4790 } 4791 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4792 } 4793 } 4794 if (BasesToInheritFrom.empty()) 4795 return; 4796 4797 // Now collect the constructors that we already have in the current class. 4798 // Those take precedence over inherited constructors. 4799 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4800 // unless there is a user-declared constructor with the same signature in 4801 // the class where the using-declaration appears. 4802 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4803 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4804 CtorE = ClassDecl->ctor_end(); 4805 CtorIt != CtorE; ++CtorIt) { 4806 ExistingConstructors.insert( 4807 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4808 } 4809 4810 Scope *S = getScopeForContext(ClassDecl); 4811 DeclarationName CreatedCtorName = 4812 Context.DeclarationNames.getCXXConstructorName( 4813 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4814 4815 // Now comes the true work. 4816 // First, we keep a map from constructor types to the base that introduced 4817 // them. Needed for finding conflicting constructors. We also keep the 4818 // actually inserted declarations in there, for pretty diagnostics. 4819 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4820 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4821 ConstructorToSourceMap InheritedConstructors; 4822 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4823 BaseE = BasesToInheritFrom.end(); 4824 BaseIt != BaseE; ++BaseIt) { 4825 const RecordType *Base = *BaseIt; 4826 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4827 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4828 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4829 CtorE = BaseDecl->ctor_end(); 4830 CtorIt != CtorE; ++CtorIt) { 4831 // Find the using declaration for inheriting this base's constructors. 4832 DeclarationName Name = 4833 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4834 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4835 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4836 SourceLocation UsingLoc = UD ? UD->getLocation() : 4837 ClassDecl->getLocation(); 4838 4839 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4840 // from the class X named in the using-declaration consists of actual 4841 // constructors and notional constructors that result from the 4842 // transformation of defaulted parameters as follows: 4843 // - all non-template default constructors of X, and 4844 // - for each non-template constructor of X that has at least one 4845 // parameter with a default argument, the set of constructors that 4846 // results from omitting any ellipsis parameter specification and 4847 // successively omitting parameters with a default argument from the 4848 // end of the parameter-type-list. 4849 CXXConstructorDecl *BaseCtor = *CtorIt; 4850 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4851 const FunctionProtoType *BaseCtorType = 4852 BaseCtor->getType()->getAs<FunctionProtoType>(); 4853 4854 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4855 maxParams = BaseCtor->getNumParams(); 4856 params <= maxParams; ++params) { 4857 // Skip default constructors. They're never inherited. 4858 if (params == 0) 4859 continue; 4860 // Skip copy and move constructors for the same reason. 4861 if (CanBeCopyOrMove && params == 1) 4862 continue; 4863 4864 // Build up a function type for this particular constructor. 4865 // FIXME: The working paper does not consider that the exception spec 4866 // for the inheriting constructor might be larger than that of the 4867 // source. This code doesn't yet, either. 4868 const Type *NewCtorType; 4869 if (params == maxParams) 4870 NewCtorType = BaseCtorType; 4871 else { 4872 llvm::SmallVector<QualType, 16> Args; 4873 for (unsigned i = 0; i < params; ++i) { 4874 Args.push_back(BaseCtorType->getArgType(i)); 4875 } 4876 FunctionProtoType::ExtProtoInfo ExtInfo = 4877 BaseCtorType->getExtProtoInfo(); 4878 ExtInfo.Variadic = false; 4879 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4880 Args.data(), params, ExtInfo) 4881 .getTypePtr(); 4882 } 4883 const Type *CanonicalNewCtorType = 4884 Context.getCanonicalType(NewCtorType); 4885 4886 // Now that we have the type, first check if the class already has a 4887 // constructor with this signature. 4888 if (ExistingConstructors.count(CanonicalNewCtorType)) 4889 continue; 4890 4891 // Then we check if we have already declared an inherited constructor 4892 // with this signature. 4893 std::pair<ConstructorToSourceMap::iterator, bool> result = 4894 InheritedConstructors.insert(std::make_pair( 4895 CanonicalNewCtorType, 4896 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4897 if (!result.second) { 4898 // Already in the map. If it came from a different class, that's an 4899 // error. Not if it's from the same. 4900 CanQualType PreviousBase = result.first->second.first; 4901 if (CanonicalBase != PreviousBase) { 4902 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4903 const CXXConstructorDecl *PrevBaseCtor = 4904 PrevCtor->getInheritedConstructor(); 4905 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4906 4907 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4908 Diag(BaseCtor->getLocation(), 4909 diag::note_using_decl_constructor_conflict_current_ctor); 4910 Diag(PrevBaseCtor->getLocation(), 4911 diag::note_using_decl_constructor_conflict_previous_ctor); 4912 Diag(PrevCtor->getLocation(), 4913 diag::note_using_decl_constructor_conflict_previous_using); 4914 } 4915 continue; 4916 } 4917 4918 // OK, we're there, now add the constructor. 4919 // C++0x [class.inhctor]p8: [...] that would be performed by a 4920 // user-writtern inline constructor [...] 4921 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4922 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4923 Context, ClassDecl, DNI, QualType(NewCtorType, 0), /*TInfo=*/0, 4924 BaseCtor->isExplicit(), /*Inline=*/true, 4925 /*ImplicitlyDeclared=*/true); 4926 NewCtor->setAccess(BaseCtor->getAccess()); 4927 4928 // Build up the parameter decls and add them. 4929 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4930 for (unsigned i = 0; i < params; ++i) { 4931 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, UsingLoc, 4932 /*IdentifierInfo=*/0, 4933 BaseCtorType->getArgType(i), 4934 /*TInfo=*/0, SC_None, 4935 SC_None, /*DefaultArg=*/0)); 4936 } 4937 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4938 NewCtor->setInheritedConstructor(BaseCtor); 4939 4940 PushOnScopeChains(NewCtor, S, false); 4941 ClassDecl->addDecl(NewCtor); 4942 result.first->second.second = NewCtor; 4943 } 4944 } 4945 } 4946} 4947 4948CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4949 // C++ [class.dtor]p2: 4950 // If a class has no user-declared destructor, a destructor is 4951 // declared implicitly. An implicitly-declared destructor is an 4952 // inline public member of its class. 4953 4954 // C++ [except.spec]p14: 4955 // An implicitly declared special member function (Clause 12) shall have 4956 // an exception-specification. 4957 ImplicitExceptionSpecification ExceptSpec(Context); 4958 4959 // Direct base-class destructors. 4960 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4961 BEnd = ClassDecl->bases_end(); 4962 B != BEnd; ++B) { 4963 if (B->isVirtual()) // Handled below. 4964 continue; 4965 4966 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4967 ExceptSpec.CalledDecl( 4968 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4969 } 4970 4971 // Virtual base-class destructors. 4972 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4973 BEnd = ClassDecl->vbases_end(); 4974 B != BEnd; ++B) { 4975 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4976 ExceptSpec.CalledDecl( 4977 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4978 } 4979 4980 // Field destructors. 4981 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4982 FEnd = ClassDecl->field_end(); 4983 F != FEnd; ++F) { 4984 if (const RecordType *RecordTy 4985 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4986 ExceptSpec.CalledDecl( 4987 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4988 } 4989 4990 // Create the actual destructor declaration. 4991 FunctionProtoType::ExtProtoInfo EPI; 4992 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 4993 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 4994 EPI.NumExceptions = ExceptSpec.size(); 4995 EPI.Exceptions = ExceptSpec.data(); 4996 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4997 4998 CanQualType ClassType 4999 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5000 DeclarationName Name 5001 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5002 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5003 CXXDestructorDecl *Destructor 5004 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 5005 /*isInline=*/true, 5006 /*isImplicitlyDeclared=*/true); 5007 Destructor->setAccess(AS_public); 5008 Destructor->setImplicit(); 5009 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5010 5011 // Note that we have declared this destructor. 5012 ++ASTContext::NumImplicitDestructorsDeclared; 5013 5014 // Introduce this destructor into its scope. 5015 if (Scope *S = getScopeForContext(ClassDecl)) 5016 PushOnScopeChains(Destructor, S, false); 5017 ClassDecl->addDecl(Destructor); 5018 5019 // This could be uniqued if it ever proves significant. 5020 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5021 5022 AddOverriddenMethods(ClassDecl, Destructor); 5023 5024 return Destructor; 5025} 5026 5027void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5028 CXXDestructorDecl *Destructor) { 5029 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5030 "DefineImplicitDestructor - call it for implicit default dtor"); 5031 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5032 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5033 5034 if (Destructor->isInvalidDecl()) 5035 return; 5036 5037 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5038 5039 DiagnosticErrorTrap Trap(Diags); 5040 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5041 Destructor->getParent()); 5042 5043 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5044 Diag(CurrentLocation, diag::note_member_synthesized_at) 5045 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5046 5047 Destructor->setInvalidDecl(); 5048 return; 5049 } 5050 5051 SourceLocation Loc = Destructor->getLocation(); 5052 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5053 5054 Destructor->setUsed(); 5055 MarkVTableUsed(CurrentLocation, ClassDecl); 5056} 5057 5058/// \brief Builds a statement that copies the given entity from \p From to 5059/// \c To. 5060/// 5061/// This routine is used to copy the members of a class with an 5062/// implicitly-declared copy assignment operator. When the entities being 5063/// copied are arrays, this routine builds for loops to copy them. 5064/// 5065/// \param S The Sema object used for type-checking. 5066/// 5067/// \param Loc The location where the implicit copy is being generated. 5068/// 5069/// \param T The type of the expressions being copied. Both expressions must 5070/// have this type. 5071/// 5072/// \param To The expression we are copying to. 5073/// 5074/// \param From The expression we are copying from. 5075/// 5076/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5077/// Otherwise, it's a non-static member subobject. 5078/// 5079/// \param Depth Internal parameter recording the depth of the recursion. 5080/// 5081/// \returns A statement or a loop that copies the expressions. 5082static StmtResult 5083BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5084 Expr *To, Expr *From, 5085 bool CopyingBaseSubobject, unsigned Depth = 0) { 5086 // C++0x [class.copy]p30: 5087 // Each subobject is assigned in the manner appropriate to its type: 5088 // 5089 // - if the subobject is of class type, the copy assignment operator 5090 // for the class is used (as if by explicit qualification; that is, 5091 // ignoring any possible virtual overriding functions in more derived 5092 // classes); 5093 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5094 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5095 5096 // Look for operator=. 5097 DeclarationName Name 5098 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5099 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5100 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5101 5102 // Filter out any result that isn't a copy-assignment operator. 5103 LookupResult::Filter F = OpLookup.makeFilter(); 5104 while (F.hasNext()) { 5105 NamedDecl *D = F.next(); 5106 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5107 if (Method->isCopyAssignmentOperator()) 5108 continue; 5109 5110 F.erase(); 5111 } 5112 F.done(); 5113 5114 // Suppress the protected check (C++ [class.protected]) for each of the 5115 // assignment operators we found. This strange dance is required when 5116 // we're assigning via a base classes's copy-assignment operator. To 5117 // ensure that we're getting the right base class subobject (without 5118 // ambiguities), we need to cast "this" to that subobject type; to 5119 // ensure that we don't go through the virtual call mechanism, we need 5120 // to qualify the operator= name with the base class (see below). However, 5121 // this means that if the base class has a protected copy assignment 5122 // operator, the protected member access check will fail. So, we 5123 // rewrite "protected" access to "public" access in this case, since we 5124 // know by construction that we're calling from a derived class. 5125 if (CopyingBaseSubobject) { 5126 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5127 L != LEnd; ++L) { 5128 if (L.getAccess() == AS_protected) 5129 L.setAccess(AS_public); 5130 } 5131 } 5132 5133 // Create the nested-name-specifier that will be used to qualify the 5134 // reference to operator=; this is required to suppress the virtual 5135 // call mechanism. 5136 CXXScopeSpec SS; 5137 SS.MakeTrivial(S.Context, 5138 NestedNameSpecifier::Create(S.Context, 0, false, 5139 T.getTypePtr()), 5140 Loc); 5141 5142 // Create the reference to operator=. 5143 ExprResult OpEqualRef 5144 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5145 /*FirstQualifierInScope=*/0, OpLookup, 5146 /*TemplateArgs=*/0, 5147 /*SuppressQualifierCheck=*/true); 5148 if (OpEqualRef.isInvalid()) 5149 return StmtError(); 5150 5151 // Build the call to the assignment operator. 5152 5153 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5154 OpEqualRef.takeAs<Expr>(), 5155 Loc, &From, 1, Loc); 5156 if (Call.isInvalid()) 5157 return StmtError(); 5158 5159 return S.Owned(Call.takeAs<Stmt>()); 5160 } 5161 5162 // - if the subobject is of scalar type, the built-in assignment 5163 // operator is used. 5164 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5165 if (!ArrayTy) { 5166 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5167 if (Assignment.isInvalid()) 5168 return StmtError(); 5169 5170 return S.Owned(Assignment.takeAs<Stmt>()); 5171 } 5172 5173 // - if the subobject is an array, each element is assigned, in the 5174 // manner appropriate to the element type; 5175 5176 // Construct a loop over the array bounds, e.g., 5177 // 5178 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5179 // 5180 // that will copy each of the array elements. 5181 QualType SizeType = S.Context.getSizeType(); 5182 5183 // Create the iteration variable. 5184 IdentifierInfo *IterationVarName = 0; 5185 { 5186 llvm::SmallString<8> Str; 5187 llvm::raw_svector_ostream OS(Str); 5188 OS << "__i" << Depth; 5189 IterationVarName = &S.Context.Idents.get(OS.str()); 5190 } 5191 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 5192 IterationVarName, SizeType, 5193 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5194 SC_None, SC_None); 5195 5196 // Initialize the iteration variable to zero. 5197 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5198 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5199 5200 // Create a reference to the iteration variable; we'll use this several 5201 // times throughout. 5202 Expr *IterationVarRef 5203 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5204 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5205 5206 // Create the DeclStmt that holds the iteration variable. 5207 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5208 5209 // Create the comparison against the array bound. 5210 llvm::APInt Upper 5211 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5212 Expr *Comparison 5213 = new (S.Context) BinaryOperator(IterationVarRef, 5214 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5215 BO_NE, S.Context.BoolTy, 5216 VK_RValue, OK_Ordinary, Loc); 5217 5218 // Create the pre-increment of the iteration variable. 5219 Expr *Increment 5220 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5221 VK_LValue, OK_Ordinary, Loc); 5222 5223 // Subscript the "from" and "to" expressions with the iteration variable. 5224 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5225 IterationVarRef, Loc)); 5226 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5227 IterationVarRef, Loc)); 5228 5229 // Build the copy for an individual element of the array. 5230 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5231 To, From, CopyingBaseSubobject, 5232 Depth + 1); 5233 if (Copy.isInvalid()) 5234 return StmtError(); 5235 5236 // Construct the loop that copies all elements of this array. 5237 return S.ActOnForStmt(Loc, Loc, InitStmt, 5238 S.MakeFullExpr(Comparison), 5239 0, S.MakeFullExpr(Increment), 5240 Loc, Copy.take()); 5241} 5242 5243/// \brief Determine whether the given class has a copy assignment operator 5244/// that accepts a const-qualified argument. 5245static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5246 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5247 5248 if (!Class->hasDeclaredCopyAssignment()) 5249 S.DeclareImplicitCopyAssignment(Class); 5250 5251 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5252 DeclarationName OpName 5253 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5254 5255 DeclContext::lookup_const_iterator Op, OpEnd; 5256 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5257 // C++ [class.copy]p9: 5258 // A user-declared copy assignment operator is a non-static non-template 5259 // member function of class X with exactly one parameter of type X, X&, 5260 // const X&, volatile X& or const volatile X&. 5261 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5262 if (!Method) 5263 continue; 5264 5265 if (Method->isStatic()) 5266 continue; 5267 if (Method->getPrimaryTemplate()) 5268 continue; 5269 const FunctionProtoType *FnType = 5270 Method->getType()->getAs<FunctionProtoType>(); 5271 assert(FnType && "Overloaded operator has no prototype."); 5272 // Don't assert on this; an invalid decl might have been left in the AST. 5273 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5274 continue; 5275 bool AcceptsConst = true; 5276 QualType ArgType = FnType->getArgType(0); 5277 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5278 ArgType = Ref->getPointeeType(); 5279 // Is it a non-const lvalue reference? 5280 if (!ArgType.isConstQualified()) 5281 AcceptsConst = false; 5282 } 5283 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5284 continue; 5285 5286 // We have a single argument of type cv X or cv X&, i.e. we've found the 5287 // copy assignment operator. Return whether it accepts const arguments. 5288 return AcceptsConst; 5289 } 5290 assert(Class->isInvalidDecl() && 5291 "No copy assignment operator declared in valid code."); 5292 return false; 5293} 5294 5295CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5296 // Note: The following rules are largely analoguous to the copy 5297 // constructor rules. Note that virtual bases are not taken into account 5298 // for determining the argument type of the operator. Note also that 5299 // operators taking an object instead of a reference are allowed. 5300 5301 5302 // C++ [class.copy]p10: 5303 // If the class definition does not explicitly declare a copy 5304 // assignment operator, one is declared implicitly. 5305 // The implicitly-defined copy assignment operator for a class X 5306 // will have the form 5307 // 5308 // X& X::operator=(const X&) 5309 // 5310 // if 5311 bool HasConstCopyAssignment = true; 5312 5313 // -- each direct base class B of X has a copy assignment operator 5314 // whose parameter is of type const B&, const volatile B& or B, 5315 // and 5316 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5317 BaseEnd = ClassDecl->bases_end(); 5318 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5319 assert(!Base->getType()->isDependentType() && 5320 "Cannot generate implicit members for class with dependent bases."); 5321 const CXXRecordDecl *BaseClassDecl 5322 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5323 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5324 } 5325 5326 // -- for all the nonstatic data members of X that are of a class 5327 // type M (or array thereof), each such class type has a copy 5328 // assignment operator whose parameter is of type const M&, 5329 // const volatile M& or M. 5330 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5331 FieldEnd = ClassDecl->field_end(); 5332 HasConstCopyAssignment && Field != FieldEnd; 5333 ++Field) { 5334 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5335 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5336 const CXXRecordDecl *FieldClassDecl 5337 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5338 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5339 } 5340 } 5341 5342 // Otherwise, the implicitly declared copy assignment operator will 5343 // have the form 5344 // 5345 // X& X::operator=(X&) 5346 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5347 QualType RetType = Context.getLValueReferenceType(ArgType); 5348 if (HasConstCopyAssignment) 5349 ArgType = ArgType.withConst(); 5350 ArgType = Context.getLValueReferenceType(ArgType); 5351 5352 // C++ [except.spec]p14: 5353 // An implicitly declared special member function (Clause 12) shall have an 5354 // exception-specification. [...] 5355 ImplicitExceptionSpecification ExceptSpec(Context); 5356 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5357 BaseEnd = ClassDecl->bases_end(); 5358 Base != BaseEnd; ++Base) { 5359 CXXRecordDecl *BaseClassDecl 5360 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5361 5362 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5363 DeclareImplicitCopyAssignment(BaseClassDecl); 5364 5365 if (CXXMethodDecl *CopyAssign 5366 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5367 ExceptSpec.CalledDecl(CopyAssign); 5368 } 5369 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5370 FieldEnd = ClassDecl->field_end(); 5371 Field != FieldEnd; 5372 ++Field) { 5373 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5374 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5375 CXXRecordDecl *FieldClassDecl 5376 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5377 5378 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5379 DeclareImplicitCopyAssignment(FieldClassDecl); 5380 5381 if (CXXMethodDecl *CopyAssign 5382 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5383 ExceptSpec.CalledDecl(CopyAssign); 5384 } 5385 } 5386 5387 // An implicitly-declared copy assignment operator is an inline public 5388 // member of its class. 5389 FunctionProtoType::ExtProtoInfo EPI; 5390 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5391 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5392 EPI.NumExceptions = ExceptSpec.size(); 5393 EPI.Exceptions = ExceptSpec.data(); 5394 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5395 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5396 CXXMethodDecl *CopyAssignment 5397 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 5398 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5399 /*TInfo=*/0, /*isStatic=*/false, 5400 /*StorageClassAsWritten=*/SC_None, 5401 /*isInline=*/true); 5402 CopyAssignment->setAccess(AS_public); 5403 CopyAssignment->setImplicit(); 5404 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5405 5406 // Add the parameter to the operator. 5407 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5408 ClassDecl->getLocation(), 5409 /*Id=*/0, 5410 ArgType, /*TInfo=*/0, 5411 SC_None, 5412 SC_None, 0); 5413 CopyAssignment->setParams(&FromParam, 1); 5414 5415 // Note that we have added this copy-assignment operator. 5416 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5417 5418 if (Scope *S = getScopeForContext(ClassDecl)) 5419 PushOnScopeChains(CopyAssignment, S, false); 5420 ClassDecl->addDecl(CopyAssignment); 5421 5422 AddOverriddenMethods(ClassDecl, CopyAssignment); 5423 return CopyAssignment; 5424} 5425 5426void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5427 CXXMethodDecl *CopyAssignOperator) { 5428 assert((CopyAssignOperator->isImplicit() && 5429 CopyAssignOperator->isOverloadedOperator() && 5430 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5431 !CopyAssignOperator->isUsed(false)) && 5432 "DefineImplicitCopyAssignment called for wrong function"); 5433 5434 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5435 5436 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5437 CopyAssignOperator->setInvalidDecl(); 5438 return; 5439 } 5440 5441 CopyAssignOperator->setUsed(); 5442 5443 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5444 DiagnosticErrorTrap Trap(Diags); 5445 5446 // C++0x [class.copy]p30: 5447 // The implicitly-defined or explicitly-defaulted copy assignment operator 5448 // for a non-union class X performs memberwise copy assignment of its 5449 // subobjects. The direct base classes of X are assigned first, in the 5450 // order of their declaration in the base-specifier-list, and then the 5451 // immediate non-static data members of X are assigned, in the order in 5452 // which they were declared in the class definition. 5453 5454 // The statements that form the synthesized function body. 5455 ASTOwningVector<Stmt*> Statements(*this); 5456 5457 // The parameter for the "other" object, which we are copying from. 5458 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5459 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5460 QualType OtherRefType = Other->getType(); 5461 if (const LValueReferenceType *OtherRef 5462 = OtherRefType->getAs<LValueReferenceType>()) { 5463 OtherRefType = OtherRef->getPointeeType(); 5464 OtherQuals = OtherRefType.getQualifiers(); 5465 } 5466 5467 // Our location for everything implicitly-generated. 5468 SourceLocation Loc = CopyAssignOperator->getLocation(); 5469 5470 // Construct a reference to the "other" object. We'll be using this 5471 // throughout the generated ASTs. 5472 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5473 assert(OtherRef && "Reference to parameter cannot fail!"); 5474 5475 // Construct the "this" pointer. We'll be using this throughout the generated 5476 // ASTs. 5477 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5478 assert(This && "Reference to this cannot fail!"); 5479 5480 // Assign base classes. 5481 bool Invalid = false; 5482 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5483 E = ClassDecl->bases_end(); Base != E; ++Base) { 5484 // Form the assignment: 5485 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5486 QualType BaseType = Base->getType().getUnqualifiedType(); 5487 if (!BaseType->isRecordType()) { 5488 Invalid = true; 5489 continue; 5490 } 5491 5492 CXXCastPath BasePath; 5493 BasePath.push_back(Base); 5494 5495 // Construct the "from" expression, which is an implicit cast to the 5496 // appropriately-qualified base type. 5497 Expr *From = OtherRef; 5498 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5499 CK_UncheckedDerivedToBase, 5500 VK_LValue, &BasePath); 5501 5502 // Dereference "this". 5503 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5504 5505 // Implicitly cast "this" to the appropriately-qualified base type. 5506 Expr *ToE = To.takeAs<Expr>(); 5507 ImpCastExprToType(ToE, 5508 Context.getCVRQualifiedType(BaseType, 5509 CopyAssignOperator->getTypeQualifiers()), 5510 CK_UncheckedDerivedToBase, 5511 VK_LValue, &BasePath); 5512 To = Owned(ToE); 5513 5514 // Build the copy. 5515 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5516 To.get(), From, 5517 /*CopyingBaseSubobject=*/true); 5518 if (Copy.isInvalid()) { 5519 Diag(CurrentLocation, diag::note_member_synthesized_at) 5520 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5521 CopyAssignOperator->setInvalidDecl(); 5522 return; 5523 } 5524 5525 // Success! Record the copy. 5526 Statements.push_back(Copy.takeAs<Expr>()); 5527 } 5528 5529 // \brief Reference to the __builtin_memcpy function. 5530 Expr *BuiltinMemCpyRef = 0; 5531 // \brief Reference to the __builtin_objc_memmove_collectable function. 5532 Expr *CollectableMemCpyRef = 0; 5533 5534 // Assign non-static members. 5535 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5536 FieldEnd = ClassDecl->field_end(); 5537 Field != FieldEnd; ++Field) { 5538 // Check for members of reference type; we can't copy those. 5539 if (Field->getType()->isReferenceType()) { 5540 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5541 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5542 Diag(Field->getLocation(), diag::note_declared_at); 5543 Diag(CurrentLocation, diag::note_member_synthesized_at) 5544 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5545 Invalid = true; 5546 continue; 5547 } 5548 5549 // Check for members of const-qualified, non-class type. 5550 QualType BaseType = Context.getBaseElementType(Field->getType()); 5551 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5552 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5553 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5554 Diag(Field->getLocation(), diag::note_declared_at); 5555 Diag(CurrentLocation, diag::note_member_synthesized_at) 5556 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5557 Invalid = true; 5558 continue; 5559 } 5560 5561 QualType FieldType = Field->getType().getNonReferenceType(); 5562 if (FieldType->isIncompleteArrayType()) { 5563 assert(ClassDecl->hasFlexibleArrayMember() && 5564 "Incomplete array type is not valid"); 5565 continue; 5566 } 5567 5568 // Build references to the field in the object we're copying from and to. 5569 CXXScopeSpec SS; // Intentionally empty 5570 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5571 LookupMemberName); 5572 MemberLookup.addDecl(*Field); 5573 MemberLookup.resolveKind(); 5574 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5575 Loc, /*IsArrow=*/false, 5576 SS, 0, MemberLookup, 0); 5577 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5578 Loc, /*IsArrow=*/true, 5579 SS, 0, MemberLookup, 0); 5580 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5581 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5582 5583 // If the field should be copied with __builtin_memcpy rather than via 5584 // explicit assignments, do so. This optimization only applies for arrays 5585 // of scalars and arrays of class type with trivial copy-assignment 5586 // operators. 5587 if (FieldType->isArrayType() && 5588 (!BaseType->isRecordType() || 5589 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5590 ->hasTrivialCopyAssignment())) { 5591 // Compute the size of the memory buffer to be copied. 5592 QualType SizeType = Context.getSizeType(); 5593 llvm::APInt Size(Context.getTypeSize(SizeType), 5594 Context.getTypeSizeInChars(BaseType).getQuantity()); 5595 for (const ConstantArrayType *Array 5596 = Context.getAsConstantArrayType(FieldType); 5597 Array; 5598 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5599 llvm::APInt ArraySize 5600 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5601 Size *= ArraySize; 5602 } 5603 5604 // Take the address of the field references for "from" and "to". 5605 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5606 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5607 5608 bool NeedsCollectableMemCpy = 5609 (BaseType->isRecordType() && 5610 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5611 5612 if (NeedsCollectableMemCpy) { 5613 if (!CollectableMemCpyRef) { 5614 // Create a reference to the __builtin_objc_memmove_collectable function. 5615 LookupResult R(*this, 5616 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5617 Loc, LookupOrdinaryName); 5618 LookupName(R, TUScope, true); 5619 5620 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5621 if (!CollectableMemCpy) { 5622 // Something went horribly wrong earlier, and we will have 5623 // complained about it. 5624 Invalid = true; 5625 continue; 5626 } 5627 5628 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5629 CollectableMemCpy->getType(), 5630 VK_LValue, Loc, 0).take(); 5631 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5632 } 5633 } 5634 // Create a reference to the __builtin_memcpy builtin function. 5635 else if (!BuiltinMemCpyRef) { 5636 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5637 LookupOrdinaryName); 5638 LookupName(R, TUScope, true); 5639 5640 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5641 if (!BuiltinMemCpy) { 5642 // Something went horribly wrong earlier, and we will have complained 5643 // about it. 5644 Invalid = true; 5645 continue; 5646 } 5647 5648 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5649 BuiltinMemCpy->getType(), 5650 VK_LValue, Loc, 0).take(); 5651 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5652 } 5653 5654 ASTOwningVector<Expr*> CallArgs(*this); 5655 CallArgs.push_back(To.takeAs<Expr>()); 5656 CallArgs.push_back(From.takeAs<Expr>()); 5657 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5658 ExprResult Call = ExprError(); 5659 if (NeedsCollectableMemCpy) 5660 Call = ActOnCallExpr(/*Scope=*/0, 5661 CollectableMemCpyRef, 5662 Loc, move_arg(CallArgs), 5663 Loc); 5664 else 5665 Call = ActOnCallExpr(/*Scope=*/0, 5666 BuiltinMemCpyRef, 5667 Loc, move_arg(CallArgs), 5668 Loc); 5669 5670 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5671 Statements.push_back(Call.takeAs<Expr>()); 5672 continue; 5673 } 5674 5675 // Build the copy of this field. 5676 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5677 To.get(), From.get(), 5678 /*CopyingBaseSubobject=*/false); 5679 if (Copy.isInvalid()) { 5680 Diag(CurrentLocation, diag::note_member_synthesized_at) 5681 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5682 CopyAssignOperator->setInvalidDecl(); 5683 return; 5684 } 5685 5686 // Success! Record the copy. 5687 Statements.push_back(Copy.takeAs<Stmt>()); 5688 } 5689 5690 if (!Invalid) { 5691 // Add a "return *this;" 5692 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5693 5694 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5695 if (Return.isInvalid()) 5696 Invalid = true; 5697 else { 5698 Statements.push_back(Return.takeAs<Stmt>()); 5699 5700 if (Trap.hasErrorOccurred()) { 5701 Diag(CurrentLocation, diag::note_member_synthesized_at) 5702 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5703 Invalid = true; 5704 } 5705 } 5706 } 5707 5708 if (Invalid) { 5709 CopyAssignOperator->setInvalidDecl(); 5710 return; 5711 } 5712 5713 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5714 /*isStmtExpr=*/false); 5715 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5716 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5717} 5718 5719CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5720 CXXRecordDecl *ClassDecl) { 5721 // C++ [class.copy]p4: 5722 // If the class definition does not explicitly declare a copy 5723 // constructor, one is declared implicitly. 5724 5725 // C++ [class.copy]p5: 5726 // The implicitly-declared copy constructor for a class X will 5727 // have the form 5728 // 5729 // X::X(const X&) 5730 // 5731 // if 5732 bool HasConstCopyConstructor = true; 5733 5734 // -- each direct or virtual base class B of X has a copy 5735 // constructor whose first parameter is of type const B& or 5736 // const volatile B&, and 5737 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5738 BaseEnd = ClassDecl->bases_end(); 5739 HasConstCopyConstructor && Base != BaseEnd; 5740 ++Base) { 5741 // Virtual bases are handled below. 5742 if (Base->isVirtual()) 5743 continue; 5744 5745 CXXRecordDecl *BaseClassDecl 5746 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5747 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5748 DeclareImplicitCopyConstructor(BaseClassDecl); 5749 5750 HasConstCopyConstructor 5751 = BaseClassDecl->hasConstCopyConstructor(Context); 5752 } 5753 5754 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5755 BaseEnd = ClassDecl->vbases_end(); 5756 HasConstCopyConstructor && Base != BaseEnd; 5757 ++Base) { 5758 CXXRecordDecl *BaseClassDecl 5759 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5760 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5761 DeclareImplicitCopyConstructor(BaseClassDecl); 5762 5763 HasConstCopyConstructor 5764 = BaseClassDecl->hasConstCopyConstructor(Context); 5765 } 5766 5767 // -- for all the nonstatic data members of X that are of a 5768 // class type M (or array thereof), each such class type 5769 // has a copy constructor whose first parameter is of type 5770 // const M& or const volatile M&. 5771 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5772 FieldEnd = ClassDecl->field_end(); 5773 HasConstCopyConstructor && Field != FieldEnd; 5774 ++Field) { 5775 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5776 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5777 CXXRecordDecl *FieldClassDecl 5778 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5779 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5780 DeclareImplicitCopyConstructor(FieldClassDecl); 5781 5782 HasConstCopyConstructor 5783 = FieldClassDecl->hasConstCopyConstructor(Context); 5784 } 5785 } 5786 5787 // Otherwise, the implicitly declared copy constructor will have 5788 // the form 5789 // 5790 // X::X(X&) 5791 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5792 QualType ArgType = ClassType; 5793 if (HasConstCopyConstructor) 5794 ArgType = ArgType.withConst(); 5795 ArgType = Context.getLValueReferenceType(ArgType); 5796 5797 // C++ [except.spec]p14: 5798 // An implicitly declared special member function (Clause 12) shall have an 5799 // exception-specification. [...] 5800 ImplicitExceptionSpecification ExceptSpec(Context); 5801 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5802 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5803 BaseEnd = ClassDecl->bases_end(); 5804 Base != BaseEnd; 5805 ++Base) { 5806 // Virtual bases are handled below. 5807 if (Base->isVirtual()) 5808 continue; 5809 5810 CXXRecordDecl *BaseClassDecl 5811 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5812 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5813 DeclareImplicitCopyConstructor(BaseClassDecl); 5814 5815 if (CXXConstructorDecl *CopyConstructor 5816 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5817 ExceptSpec.CalledDecl(CopyConstructor); 5818 } 5819 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5820 BaseEnd = ClassDecl->vbases_end(); 5821 Base != BaseEnd; 5822 ++Base) { 5823 CXXRecordDecl *BaseClassDecl 5824 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5825 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5826 DeclareImplicitCopyConstructor(BaseClassDecl); 5827 5828 if (CXXConstructorDecl *CopyConstructor 5829 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5830 ExceptSpec.CalledDecl(CopyConstructor); 5831 } 5832 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5833 FieldEnd = ClassDecl->field_end(); 5834 Field != FieldEnd; 5835 ++Field) { 5836 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5837 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5838 CXXRecordDecl *FieldClassDecl 5839 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5840 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5841 DeclareImplicitCopyConstructor(FieldClassDecl); 5842 5843 if (CXXConstructorDecl *CopyConstructor 5844 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5845 ExceptSpec.CalledDecl(CopyConstructor); 5846 } 5847 } 5848 5849 // An implicitly-declared copy constructor is an inline public 5850 // member of its class. 5851 FunctionProtoType::ExtProtoInfo EPI; 5852 EPI.HasExceptionSpec = ExceptSpec.hasExceptionSpecification(); 5853 EPI.HasAnyExceptionSpec = ExceptSpec.hasAnyExceptionSpecification(); 5854 EPI.NumExceptions = ExceptSpec.size(); 5855 EPI.Exceptions = ExceptSpec.data(); 5856 DeclarationName Name 5857 = Context.DeclarationNames.getCXXConstructorName( 5858 Context.getCanonicalType(ClassType)); 5859 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5860 CXXConstructorDecl *CopyConstructor 5861 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5862 Context.getFunctionType(Context.VoidTy, 5863 &ArgType, 1, EPI), 5864 /*TInfo=*/0, 5865 /*isExplicit=*/false, 5866 /*isInline=*/true, 5867 /*isImplicitlyDeclared=*/true); 5868 CopyConstructor->setAccess(AS_public); 5869 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5870 5871 // Note that we have declared this constructor. 5872 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5873 5874 // Add the parameter to the constructor. 5875 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5876 ClassDecl->getLocation(), 5877 /*IdentifierInfo=*/0, 5878 ArgType, /*TInfo=*/0, 5879 SC_None, 5880 SC_None, 0); 5881 CopyConstructor->setParams(&FromParam, 1); 5882 if (Scope *S = getScopeForContext(ClassDecl)) 5883 PushOnScopeChains(CopyConstructor, S, false); 5884 ClassDecl->addDecl(CopyConstructor); 5885 5886 return CopyConstructor; 5887} 5888 5889void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5890 CXXConstructorDecl *CopyConstructor, 5891 unsigned TypeQuals) { 5892 assert((CopyConstructor->isImplicit() && 5893 CopyConstructor->isCopyConstructor(TypeQuals) && 5894 !CopyConstructor->isUsed(false)) && 5895 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5896 5897 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5898 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5899 5900 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5901 DiagnosticErrorTrap Trap(Diags); 5902 5903 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5904 Trap.hasErrorOccurred()) { 5905 Diag(CurrentLocation, diag::note_member_synthesized_at) 5906 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5907 CopyConstructor->setInvalidDecl(); 5908 } else { 5909 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5910 CopyConstructor->getLocation(), 5911 MultiStmtArg(*this, 0, 0), 5912 /*isStmtExpr=*/false) 5913 .takeAs<Stmt>()); 5914 } 5915 5916 CopyConstructor->setUsed(); 5917} 5918 5919ExprResult 5920Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5921 CXXConstructorDecl *Constructor, 5922 MultiExprArg ExprArgs, 5923 bool RequiresZeroInit, 5924 unsigned ConstructKind, 5925 SourceRange ParenRange) { 5926 bool Elidable = false; 5927 5928 // C++0x [class.copy]p34: 5929 // When certain criteria are met, an implementation is allowed to 5930 // omit the copy/move construction of a class object, even if the 5931 // copy/move constructor and/or destructor for the object have 5932 // side effects. [...] 5933 // - when a temporary class object that has not been bound to a 5934 // reference (12.2) would be copied/moved to a class object 5935 // with the same cv-unqualified type, the copy/move operation 5936 // can be omitted by constructing the temporary object 5937 // directly into the target of the omitted copy/move 5938 if (ConstructKind == CXXConstructExpr::CK_Complete && 5939 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5940 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5941 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5942 } 5943 5944 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5945 Elidable, move(ExprArgs), RequiresZeroInit, 5946 ConstructKind, ParenRange); 5947} 5948 5949/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5950/// including handling of its default argument expressions. 5951ExprResult 5952Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5953 CXXConstructorDecl *Constructor, bool Elidable, 5954 MultiExprArg ExprArgs, 5955 bool RequiresZeroInit, 5956 unsigned ConstructKind, 5957 SourceRange ParenRange) { 5958 unsigned NumExprs = ExprArgs.size(); 5959 Expr **Exprs = (Expr **)ExprArgs.release(); 5960 5961 MarkDeclarationReferenced(ConstructLoc, Constructor); 5962 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5963 Constructor, Elidable, Exprs, NumExprs, 5964 RequiresZeroInit, 5965 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5966 ParenRange)); 5967} 5968 5969bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5970 CXXConstructorDecl *Constructor, 5971 MultiExprArg Exprs) { 5972 // FIXME: Provide the correct paren SourceRange when available. 5973 ExprResult TempResult = 5974 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5975 move(Exprs), false, CXXConstructExpr::CK_Complete, 5976 SourceRange()); 5977 if (TempResult.isInvalid()) 5978 return true; 5979 5980 Expr *Temp = TempResult.takeAs<Expr>(); 5981 CheckImplicitConversions(Temp, VD->getLocation()); 5982 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5983 Temp = MaybeCreateExprWithCleanups(Temp); 5984 VD->setInit(Temp); 5985 5986 return false; 5987} 5988 5989void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5990 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5991 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5992 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5993 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5994 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5995 CheckDestructorAccess(VD->getLocation(), Destructor, 5996 PDiag(diag::err_access_dtor_var) 5997 << VD->getDeclName() 5998 << VD->getType()); 5999 6000 // TODO: this should be re-enabled for static locals by !CXAAtExit 6001 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 6002 Diag(VD->getLocation(), diag::warn_global_destructor); 6003 } 6004} 6005 6006/// AddCXXDirectInitializerToDecl - This action is called immediately after 6007/// ActOnDeclarator, when a C++ direct initializer is present. 6008/// e.g: "int x(1);" 6009void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6010 SourceLocation LParenLoc, 6011 MultiExprArg Exprs, 6012 SourceLocation RParenLoc, 6013 bool TypeMayContainAuto) { 6014 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6015 6016 // If there is no declaration, there was an error parsing it. Just ignore 6017 // the initializer. 6018 if (RealDecl == 0) 6019 return; 6020 6021 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6022 if (!VDecl) { 6023 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6024 RealDecl->setInvalidDecl(); 6025 return; 6026 } 6027 6028 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6029 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6030 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6031 if (Exprs.size() > 1) { 6032 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6033 diag::err_auto_var_init_multiple_expressions) 6034 << VDecl->getDeclName() << VDecl->getType() 6035 << VDecl->getSourceRange(); 6036 RealDecl->setInvalidDecl(); 6037 return; 6038 } 6039 6040 Expr *Init = Exprs.get()[0]; 6041 QualType DeducedType; 6042 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 6043 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6044 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6045 << Init->getSourceRange(); 6046 RealDecl->setInvalidDecl(); 6047 return; 6048 } 6049 VDecl->setType(DeducedType); 6050 6051 // If this is a redeclaration, check that the type we just deduced matches 6052 // the previously declared type. 6053 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6054 MergeVarDeclTypes(VDecl, Old); 6055 } 6056 6057 // We will represent direct-initialization similarly to copy-initialization: 6058 // int x(1); -as-> int x = 1; 6059 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6060 // 6061 // Clients that want to distinguish between the two forms, can check for 6062 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6063 // A major benefit is that clients that don't particularly care about which 6064 // exactly form was it (like the CodeGen) can handle both cases without 6065 // special case code. 6066 6067 // C++ 8.5p11: 6068 // The form of initialization (using parentheses or '=') is generally 6069 // insignificant, but does matter when the entity being initialized has a 6070 // class type. 6071 6072 if (!VDecl->getType()->isDependentType() && 6073 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6074 diag::err_typecheck_decl_incomplete_type)) { 6075 VDecl->setInvalidDecl(); 6076 return; 6077 } 6078 6079 // The variable can not have an abstract class type. 6080 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6081 diag::err_abstract_type_in_decl, 6082 AbstractVariableType)) 6083 VDecl->setInvalidDecl(); 6084 6085 const VarDecl *Def; 6086 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6087 Diag(VDecl->getLocation(), diag::err_redefinition) 6088 << VDecl->getDeclName(); 6089 Diag(Def->getLocation(), diag::note_previous_definition); 6090 VDecl->setInvalidDecl(); 6091 return; 6092 } 6093 6094 // C++ [class.static.data]p4 6095 // If a static data member is of const integral or const 6096 // enumeration type, its declaration in the class definition can 6097 // specify a constant-initializer which shall be an integral 6098 // constant expression (5.19). In that case, the member can appear 6099 // in integral constant expressions. The member shall still be 6100 // defined in a namespace scope if it is used in the program and the 6101 // namespace scope definition shall not contain an initializer. 6102 // 6103 // We already performed a redefinition check above, but for static 6104 // data members we also need to check whether there was an in-class 6105 // declaration with an initializer. 6106 const VarDecl* PrevInit = 0; 6107 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6108 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6109 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6110 return; 6111 } 6112 6113 bool IsDependent = false; 6114 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6115 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6116 VDecl->setInvalidDecl(); 6117 return; 6118 } 6119 6120 if (Exprs.get()[I]->isTypeDependent()) 6121 IsDependent = true; 6122 } 6123 6124 // If either the declaration has a dependent type or if any of the 6125 // expressions is type-dependent, we represent the initialization 6126 // via a ParenListExpr for later use during template instantiation. 6127 if (VDecl->getType()->isDependentType() || IsDependent) { 6128 // Let clients know that initialization was done with a direct initializer. 6129 VDecl->setCXXDirectInitializer(true); 6130 6131 // Store the initialization expressions as a ParenListExpr. 6132 unsigned NumExprs = Exprs.size(); 6133 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6134 (Expr **)Exprs.release(), 6135 NumExprs, RParenLoc)); 6136 return; 6137 } 6138 6139 // Capture the variable that is being initialized and the style of 6140 // initialization. 6141 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6142 6143 // FIXME: Poor source location information. 6144 InitializationKind Kind 6145 = InitializationKind::CreateDirect(VDecl->getLocation(), 6146 LParenLoc, RParenLoc); 6147 6148 InitializationSequence InitSeq(*this, Entity, Kind, 6149 Exprs.get(), Exprs.size()); 6150 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6151 if (Result.isInvalid()) { 6152 VDecl->setInvalidDecl(); 6153 return; 6154 } 6155 6156 CheckImplicitConversions(Result.get(), LParenLoc); 6157 6158 Result = MaybeCreateExprWithCleanups(Result); 6159 VDecl->setInit(Result.takeAs<Expr>()); 6160 VDecl->setCXXDirectInitializer(true); 6161 6162 CheckCompleteVariableDeclaration(VDecl); 6163} 6164 6165/// \brief Given a constructor and the set of arguments provided for the 6166/// constructor, convert the arguments and add any required default arguments 6167/// to form a proper call to this constructor. 6168/// 6169/// \returns true if an error occurred, false otherwise. 6170bool 6171Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6172 MultiExprArg ArgsPtr, 6173 SourceLocation Loc, 6174 ASTOwningVector<Expr*> &ConvertedArgs) { 6175 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6176 unsigned NumArgs = ArgsPtr.size(); 6177 Expr **Args = (Expr **)ArgsPtr.get(); 6178 6179 const FunctionProtoType *Proto 6180 = Constructor->getType()->getAs<FunctionProtoType>(); 6181 assert(Proto && "Constructor without a prototype?"); 6182 unsigned NumArgsInProto = Proto->getNumArgs(); 6183 6184 // If too few arguments are available, we'll fill in the rest with defaults. 6185 if (NumArgs < NumArgsInProto) 6186 ConvertedArgs.reserve(NumArgsInProto); 6187 else 6188 ConvertedArgs.reserve(NumArgs); 6189 6190 VariadicCallType CallType = 6191 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6192 llvm::SmallVector<Expr *, 8> AllArgs; 6193 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6194 Proto, 0, Args, NumArgs, AllArgs, 6195 CallType); 6196 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6197 ConvertedArgs.push_back(AllArgs[i]); 6198 return Invalid; 6199} 6200 6201static inline bool 6202CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6203 const FunctionDecl *FnDecl) { 6204 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6205 if (isa<NamespaceDecl>(DC)) { 6206 return SemaRef.Diag(FnDecl->getLocation(), 6207 diag::err_operator_new_delete_declared_in_namespace) 6208 << FnDecl->getDeclName(); 6209 } 6210 6211 if (isa<TranslationUnitDecl>(DC) && 6212 FnDecl->getStorageClass() == SC_Static) { 6213 return SemaRef.Diag(FnDecl->getLocation(), 6214 diag::err_operator_new_delete_declared_static) 6215 << FnDecl->getDeclName(); 6216 } 6217 6218 return false; 6219} 6220 6221static inline bool 6222CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6223 CanQualType ExpectedResultType, 6224 CanQualType ExpectedFirstParamType, 6225 unsigned DependentParamTypeDiag, 6226 unsigned InvalidParamTypeDiag) { 6227 QualType ResultType = 6228 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6229 6230 // Check that the result type is not dependent. 6231 if (ResultType->isDependentType()) 6232 return SemaRef.Diag(FnDecl->getLocation(), 6233 diag::err_operator_new_delete_dependent_result_type) 6234 << FnDecl->getDeclName() << ExpectedResultType; 6235 6236 // Check that the result type is what we expect. 6237 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6238 return SemaRef.Diag(FnDecl->getLocation(), 6239 diag::err_operator_new_delete_invalid_result_type) 6240 << FnDecl->getDeclName() << ExpectedResultType; 6241 6242 // A function template must have at least 2 parameters. 6243 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6244 return SemaRef.Diag(FnDecl->getLocation(), 6245 diag::err_operator_new_delete_template_too_few_parameters) 6246 << FnDecl->getDeclName(); 6247 6248 // The function decl must have at least 1 parameter. 6249 if (FnDecl->getNumParams() == 0) 6250 return SemaRef.Diag(FnDecl->getLocation(), 6251 diag::err_operator_new_delete_too_few_parameters) 6252 << FnDecl->getDeclName(); 6253 6254 // Check the the first parameter type is not dependent. 6255 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6256 if (FirstParamType->isDependentType()) 6257 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6258 << FnDecl->getDeclName() << ExpectedFirstParamType; 6259 6260 // Check that the first parameter type is what we expect. 6261 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6262 ExpectedFirstParamType) 6263 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6264 << FnDecl->getDeclName() << ExpectedFirstParamType; 6265 6266 return false; 6267} 6268 6269static bool 6270CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6271 // C++ [basic.stc.dynamic.allocation]p1: 6272 // A program is ill-formed if an allocation function is declared in a 6273 // namespace scope other than global scope or declared static in global 6274 // scope. 6275 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6276 return true; 6277 6278 CanQualType SizeTy = 6279 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6280 6281 // C++ [basic.stc.dynamic.allocation]p1: 6282 // The return type shall be void*. The first parameter shall have type 6283 // std::size_t. 6284 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6285 SizeTy, 6286 diag::err_operator_new_dependent_param_type, 6287 diag::err_operator_new_param_type)) 6288 return true; 6289 6290 // C++ [basic.stc.dynamic.allocation]p1: 6291 // The first parameter shall not have an associated default argument. 6292 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6293 return SemaRef.Diag(FnDecl->getLocation(), 6294 diag::err_operator_new_default_arg) 6295 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6296 6297 return false; 6298} 6299 6300static bool 6301CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6302 // C++ [basic.stc.dynamic.deallocation]p1: 6303 // A program is ill-formed if deallocation functions are declared in a 6304 // namespace scope other than global scope or declared static in global 6305 // scope. 6306 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6307 return true; 6308 6309 // C++ [basic.stc.dynamic.deallocation]p2: 6310 // Each deallocation function shall return void and its first parameter 6311 // shall be void*. 6312 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6313 SemaRef.Context.VoidPtrTy, 6314 diag::err_operator_delete_dependent_param_type, 6315 diag::err_operator_delete_param_type)) 6316 return true; 6317 6318 return false; 6319} 6320 6321/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6322/// of this overloaded operator is well-formed. If so, returns false; 6323/// otherwise, emits appropriate diagnostics and returns true. 6324bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6325 assert(FnDecl && FnDecl->isOverloadedOperator() && 6326 "Expected an overloaded operator declaration"); 6327 6328 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6329 6330 // C++ [over.oper]p5: 6331 // The allocation and deallocation functions, operator new, 6332 // operator new[], operator delete and operator delete[], are 6333 // described completely in 3.7.3. The attributes and restrictions 6334 // found in the rest of this subclause do not apply to them unless 6335 // explicitly stated in 3.7.3. 6336 if (Op == OO_Delete || Op == OO_Array_Delete) 6337 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6338 6339 if (Op == OO_New || Op == OO_Array_New) 6340 return CheckOperatorNewDeclaration(*this, FnDecl); 6341 6342 // C++ [over.oper]p6: 6343 // An operator function shall either be a non-static member 6344 // function or be a non-member function and have at least one 6345 // parameter whose type is a class, a reference to a class, an 6346 // enumeration, or a reference to an enumeration. 6347 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6348 if (MethodDecl->isStatic()) 6349 return Diag(FnDecl->getLocation(), 6350 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6351 } else { 6352 bool ClassOrEnumParam = false; 6353 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6354 ParamEnd = FnDecl->param_end(); 6355 Param != ParamEnd; ++Param) { 6356 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6357 if (ParamType->isDependentType() || ParamType->isRecordType() || 6358 ParamType->isEnumeralType()) { 6359 ClassOrEnumParam = true; 6360 break; 6361 } 6362 } 6363 6364 if (!ClassOrEnumParam) 6365 return Diag(FnDecl->getLocation(), 6366 diag::err_operator_overload_needs_class_or_enum) 6367 << FnDecl->getDeclName(); 6368 } 6369 6370 // C++ [over.oper]p8: 6371 // An operator function cannot have default arguments (8.3.6), 6372 // except where explicitly stated below. 6373 // 6374 // Only the function-call operator allows default arguments 6375 // (C++ [over.call]p1). 6376 if (Op != OO_Call) { 6377 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6378 Param != FnDecl->param_end(); ++Param) { 6379 if ((*Param)->hasDefaultArg()) 6380 return Diag((*Param)->getLocation(), 6381 diag::err_operator_overload_default_arg) 6382 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6383 } 6384 } 6385 6386 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6387 { false, false, false } 6388#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6389 , { Unary, Binary, MemberOnly } 6390#include "clang/Basic/OperatorKinds.def" 6391 }; 6392 6393 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6394 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6395 bool MustBeMemberOperator = OperatorUses[Op][2]; 6396 6397 // C++ [over.oper]p8: 6398 // [...] Operator functions cannot have more or fewer parameters 6399 // than the number required for the corresponding operator, as 6400 // described in the rest of this subclause. 6401 unsigned NumParams = FnDecl->getNumParams() 6402 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6403 if (Op != OO_Call && 6404 ((NumParams == 1 && !CanBeUnaryOperator) || 6405 (NumParams == 2 && !CanBeBinaryOperator) || 6406 (NumParams < 1) || (NumParams > 2))) { 6407 // We have the wrong number of parameters. 6408 unsigned ErrorKind; 6409 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6410 ErrorKind = 2; // 2 -> unary or binary. 6411 } else if (CanBeUnaryOperator) { 6412 ErrorKind = 0; // 0 -> unary 6413 } else { 6414 assert(CanBeBinaryOperator && 6415 "All non-call overloaded operators are unary or binary!"); 6416 ErrorKind = 1; // 1 -> binary 6417 } 6418 6419 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6420 << FnDecl->getDeclName() << NumParams << ErrorKind; 6421 } 6422 6423 // Overloaded operators other than operator() cannot be variadic. 6424 if (Op != OO_Call && 6425 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6426 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6427 << FnDecl->getDeclName(); 6428 } 6429 6430 // Some operators must be non-static member functions. 6431 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6432 return Diag(FnDecl->getLocation(), 6433 diag::err_operator_overload_must_be_member) 6434 << FnDecl->getDeclName(); 6435 } 6436 6437 // C++ [over.inc]p1: 6438 // The user-defined function called operator++ implements the 6439 // prefix and postfix ++ operator. If this function is a member 6440 // function with no parameters, or a non-member function with one 6441 // parameter of class or enumeration type, it defines the prefix 6442 // increment operator ++ for objects of that type. If the function 6443 // is a member function with one parameter (which shall be of type 6444 // int) or a non-member function with two parameters (the second 6445 // of which shall be of type int), it defines the postfix 6446 // increment operator ++ for objects of that type. 6447 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6448 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6449 bool ParamIsInt = false; 6450 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6451 ParamIsInt = BT->getKind() == BuiltinType::Int; 6452 6453 if (!ParamIsInt) 6454 return Diag(LastParam->getLocation(), 6455 diag::err_operator_overload_post_incdec_must_be_int) 6456 << LastParam->getType() << (Op == OO_MinusMinus); 6457 } 6458 6459 return false; 6460} 6461 6462/// CheckLiteralOperatorDeclaration - Check whether the declaration 6463/// of this literal operator function is well-formed. If so, returns 6464/// false; otherwise, emits appropriate diagnostics and returns true. 6465bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6466 DeclContext *DC = FnDecl->getDeclContext(); 6467 Decl::Kind Kind = DC->getDeclKind(); 6468 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6469 Kind != Decl::LinkageSpec) { 6470 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6471 << FnDecl->getDeclName(); 6472 return true; 6473 } 6474 6475 bool Valid = false; 6476 6477 // template <char...> type operator "" name() is the only valid template 6478 // signature, and the only valid signature with no parameters. 6479 if (FnDecl->param_size() == 0) { 6480 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6481 // Must have only one template parameter 6482 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6483 if (Params->size() == 1) { 6484 NonTypeTemplateParmDecl *PmDecl = 6485 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6486 6487 // The template parameter must be a char parameter pack. 6488 if (PmDecl && PmDecl->isTemplateParameterPack() && 6489 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6490 Valid = true; 6491 } 6492 } 6493 } else { 6494 // Check the first parameter 6495 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6496 6497 QualType T = (*Param)->getType(); 6498 6499 // unsigned long long int, long double, and any character type are allowed 6500 // as the only parameters. 6501 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6502 Context.hasSameType(T, Context.LongDoubleTy) || 6503 Context.hasSameType(T, Context.CharTy) || 6504 Context.hasSameType(T, Context.WCharTy) || 6505 Context.hasSameType(T, Context.Char16Ty) || 6506 Context.hasSameType(T, Context.Char32Ty)) { 6507 if (++Param == FnDecl->param_end()) 6508 Valid = true; 6509 goto FinishedParams; 6510 } 6511 6512 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6513 const PointerType *PT = T->getAs<PointerType>(); 6514 if (!PT) 6515 goto FinishedParams; 6516 T = PT->getPointeeType(); 6517 if (!T.isConstQualified()) 6518 goto FinishedParams; 6519 T = T.getUnqualifiedType(); 6520 6521 // Move on to the second parameter; 6522 ++Param; 6523 6524 // If there is no second parameter, the first must be a const char * 6525 if (Param == FnDecl->param_end()) { 6526 if (Context.hasSameType(T, Context.CharTy)) 6527 Valid = true; 6528 goto FinishedParams; 6529 } 6530 6531 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6532 // are allowed as the first parameter to a two-parameter function 6533 if (!(Context.hasSameType(T, Context.CharTy) || 6534 Context.hasSameType(T, Context.WCharTy) || 6535 Context.hasSameType(T, Context.Char16Ty) || 6536 Context.hasSameType(T, Context.Char32Ty))) 6537 goto FinishedParams; 6538 6539 // The second and final parameter must be an std::size_t 6540 T = (*Param)->getType().getUnqualifiedType(); 6541 if (Context.hasSameType(T, Context.getSizeType()) && 6542 ++Param == FnDecl->param_end()) 6543 Valid = true; 6544 } 6545 6546 // FIXME: This diagnostic is absolutely terrible. 6547FinishedParams: 6548 if (!Valid) { 6549 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6550 << FnDecl->getDeclName(); 6551 return true; 6552 } 6553 6554 return false; 6555} 6556 6557/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6558/// linkage specification, including the language and (if present) 6559/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6560/// the location of the language string literal, which is provided 6561/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6562/// the '{' brace. Otherwise, this linkage specification does not 6563/// have any braces. 6564Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6565 SourceLocation LangLoc, 6566 llvm::StringRef Lang, 6567 SourceLocation LBraceLoc) { 6568 LinkageSpecDecl::LanguageIDs Language; 6569 if (Lang == "\"C\"") 6570 Language = LinkageSpecDecl::lang_c; 6571 else if (Lang == "\"C++\"") 6572 Language = LinkageSpecDecl::lang_cxx; 6573 else { 6574 Diag(LangLoc, diag::err_bad_language); 6575 return 0; 6576 } 6577 6578 // FIXME: Add all the various semantics of linkage specifications 6579 6580 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6581 LangLoc, Language); 6582 CurContext->addDecl(D); 6583 PushDeclContext(S, D); 6584 return D; 6585} 6586 6587/// ActOnFinishLinkageSpecification - Complete the definition of 6588/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6589/// valid, it's the position of the closing '}' brace in a linkage 6590/// specification that uses braces. 6591Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6592 Decl *LinkageSpec, 6593 SourceLocation RBraceLoc) { 6594 if (LinkageSpec) { 6595 if (RBraceLoc.isValid()) { 6596 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6597 LSDecl->setRBraceLoc(RBraceLoc); 6598 } 6599 PopDeclContext(); 6600 } 6601 return LinkageSpec; 6602} 6603 6604/// \brief Perform semantic analysis for the variable declaration that 6605/// occurs within a C++ catch clause, returning the newly-created 6606/// variable. 6607VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6608 TypeSourceInfo *TInfo, 6609 IdentifierInfo *Name, 6610 SourceLocation Loc) { 6611 bool Invalid = false; 6612 QualType ExDeclType = TInfo->getType(); 6613 6614 // Arrays and functions decay. 6615 if (ExDeclType->isArrayType()) 6616 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6617 else if (ExDeclType->isFunctionType()) 6618 ExDeclType = Context.getPointerType(ExDeclType); 6619 6620 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6621 // The exception-declaration shall not denote a pointer or reference to an 6622 // incomplete type, other than [cv] void*. 6623 // N2844 forbids rvalue references. 6624 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6625 Diag(Loc, diag::err_catch_rvalue_ref); 6626 Invalid = true; 6627 } 6628 6629 // GCC allows catching pointers and references to incomplete types 6630 // as an extension; so do we, but we warn by default. 6631 6632 QualType BaseType = ExDeclType; 6633 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6634 unsigned DK = diag::err_catch_incomplete; 6635 bool IncompleteCatchIsInvalid = true; 6636 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6637 BaseType = Ptr->getPointeeType(); 6638 Mode = 1; 6639 DK = diag::ext_catch_incomplete_ptr; 6640 IncompleteCatchIsInvalid = false; 6641 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6642 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6643 BaseType = Ref->getPointeeType(); 6644 Mode = 2; 6645 DK = diag::ext_catch_incomplete_ref; 6646 IncompleteCatchIsInvalid = false; 6647 } 6648 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6649 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6650 IncompleteCatchIsInvalid) 6651 Invalid = true; 6652 6653 if (!Invalid && !ExDeclType->isDependentType() && 6654 RequireNonAbstractType(Loc, ExDeclType, 6655 diag::err_abstract_type_in_decl, 6656 AbstractVariableType)) 6657 Invalid = true; 6658 6659 // Only the non-fragile NeXT runtime currently supports C++ catches 6660 // of ObjC types, and no runtime supports catching ObjC types by value. 6661 if (!Invalid && getLangOptions().ObjC1) { 6662 QualType T = ExDeclType; 6663 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6664 T = RT->getPointeeType(); 6665 6666 if (T->isObjCObjectType()) { 6667 Diag(Loc, diag::err_objc_object_catch); 6668 Invalid = true; 6669 } else if (T->isObjCObjectPointerType()) { 6670 if (!getLangOptions().NeXTRuntime) { 6671 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6672 Invalid = true; 6673 } else if (!getLangOptions().ObjCNonFragileABI) { 6674 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6675 Invalid = true; 6676 } 6677 } 6678 } 6679 6680 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6681 Name, ExDeclType, TInfo, SC_None, 6682 SC_None); 6683 ExDecl->setExceptionVariable(true); 6684 6685 if (!Invalid) { 6686 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6687 // C++ [except.handle]p16: 6688 // The object declared in an exception-declaration or, if the 6689 // exception-declaration does not specify a name, a temporary (12.2) is 6690 // copy-initialized (8.5) from the exception object. [...] 6691 // The object is destroyed when the handler exits, after the destruction 6692 // of any automatic objects initialized within the handler. 6693 // 6694 // We just pretend to initialize the object with itself, then make sure 6695 // it can be destroyed later. 6696 QualType initType = ExDeclType; 6697 6698 InitializedEntity entity = 6699 InitializedEntity::InitializeVariable(ExDecl); 6700 InitializationKind initKind = 6701 InitializationKind::CreateCopy(Loc, SourceLocation()); 6702 6703 Expr *opaqueValue = 6704 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6705 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6706 ExprResult result = sequence.Perform(*this, entity, initKind, 6707 MultiExprArg(&opaqueValue, 1)); 6708 if (result.isInvalid()) 6709 Invalid = true; 6710 else { 6711 // If the constructor used was non-trivial, set this as the 6712 // "initializer". 6713 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6714 if (!construct->getConstructor()->isTrivial()) { 6715 Expr *init = MaybeCreateExprWithCleanups(construct); 6716 ExDecl->setInit(init); 6717 } 6718 6719 // And make sure it's destructable. 6720 FinalizeVarWithDestructor(ExDecl, recordType); 6721 } 6722 } 6723 } 6724 6725 if (Invalid) 6726 ExDecl->setInvalidDecl(); 6727 6728 return ExDecl; 6729} 6730 6731/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6732/// handler. 6733Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6734 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6735 bool Invalid = D.isInvalidType(); 6736 6737 // Check for unexpanded parameter packs. 6738 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6739 UPPC_ExceptionType)) { 6740 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6741 D.getIdentifierLoc()); 6742 Invalid = true; 6743 } 6744 6745 IdentifierInfo *II = D.getIdentifier(); 6746 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6747 LookupOrdinaryName, 6748 ForRedeclaration)) { 6749 // The scope should be freshly made just for us. There is just no way 6750 // it contains any previous declaration. 6751 assert(!S->isDeclScope(PrevDecl)); 6752 if (PrevDecl->isTemplateParameter()) { 6753 // Maybe we will complain about the shadowed template parameter. 6754 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6755 } 6756 } 6757 6758 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6759 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6760 << D.getCXXScopeSpec().getRange(); 6761 Invalid = true; 6762 } 6763 6764 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6765 D.getIdentifier(), 6766 D.getIdentifierLoc()); 6767 6768 if (Invalid) 6769 ExDecl->setInvalidDecl(); 6770 6771 // Add the exception declaration into this scope. 6772 if (II) 6773 PushOnScopeChains(ExDecl, S); 6774 else 6775 CurContext->addDecl(ExDecl); 6776 6777 ProcessDeclAttributes(S, ExDecl, D); 6778 return ExDecl; 6779} 6780 6781Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6782 Expr *AssertExpr, 6783 Expr *AssertMessageExpr_) { 6784 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6785 6786 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6787 llvm::APSInt Value(32); 6788 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6789 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6790 AssertExpr->getSourceRange(); 6791 return 0; 6792 } 6793 6794 if (Value == 0) { 6795 Diag(AssertLoc, diag::err_static_assert_failed) 6796 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6797 } 6798 } 6799 6800 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6801 return 0; 6802 6803 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6804 AssertExpr, AssertMessage); 6805 6806 CurContext->addDecl(Decl); 6807 return Decl; 6808} 6809 6810/// \brief Perform semantic analysis of the given friend type declaration. 6811/// 6812/// \returns A friend declaration that. 6813FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6814 TypeSourceInfo *TSInfo) { 6815 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6816 6817 QualType T = TSInfo->getType(); 6818 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6819 6820 if (!getLangOptions().CPlusPlus0x) { 6821 // C++03 [class.friend]p2: 6822 // An elaborated-type-specifier shall be used in a friend declaration 6823 // for a class.* 6824 // 6825 // * The class-key of the elaborated-type-specifier is required. 6826 if (!ActiveTemplateInstantiations.empty()) { 6827 // Do not complain about the form of friend template types during 6828 // template instantiation; we will already have complained when the 6829 // template was declared. 6830 } else if (!T->isElaboratedTypeSpecifier()) { 6831 // If we evaluated the type to a record type, suggest putting 6832 // a tag in front. 6833 if (const RecordType *RT = T->getAs<RecordType>()) { 6834 RecordDecl *RD = RT->getDecl(); 6835 6836 std::string InsertionText = std::string(" ") + RD->getKindName(); 6837 6838 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6839 << (unsigned) RD->getTagKind() 6840 << T 6841 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6842 InsertionText); 6843 } else { 6844 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6845 << T 6846 << SourceRange(FriendLoc, TypeRange.getEnd()); 6847 } 6848 } else if (T->getAs<EnumType>()) { 6849 Diag(FriendLoc, diag::ext_enum_friend) 6850 << T 6851 << SourceRange(FriendLoc, TypeRange.getEnd()); 6852 } 6853 } 6854 6855 // C++0x [class.friend]p3: 6856 // If the type specifier in a friend declaration designates a (possibly 6857 // cv-qualified) class type, that class is declared as a friend; otherwise, 6858 // the friend declaration is ignored. 6859 6860 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6861 // in [class.friend]p3 that we do not implement. 6862 6863 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6864} 6865 6866/// Handle a friend tag declaration where the scope specifier was 6867/// templated. 6868Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6869 unsigned TagSpec, SourceLocation TagLoc, 6870 CXXScopeSpec &SS, 6871 IdentifierInfo *Name, SourceLocation NameLoc, 6872 AttributeList *Attr, 6873 MultiTemplateParamsArg TempParamLists) { 6874 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6875 6876 bool isExplicitSpecialization = false; 6877 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6878 bool Invalid = false; 6879 6880 if (TemplateParameterList *TemplateParams 6881 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6882 TempParamLists.get(), 6883 TempParamLists.size(), 6884 /*friend*/ true, 6885 isExplicitSpecialization, 6886 Invalid)) { 6887 --NumMatchedTemplateParamLists; 6888 6889 if (TemplateParams->size() > 0) { 6890 // This is a declaration of a class template. 6891 if (Invalid) 6892 return 0; 6893 6894 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6895 SS, Name, NameLoc, Attr, 6896 TemplateParams, AS_public).take(); 6897 } else { 6898 // The "template<>" header is extraneous. 6899 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6900 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6901 isExplicitSpecialization = true; 6902 } 6903 } 6904 6905 if (Invalid) return 0; 6906 6907 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6908 6909 bool isAllExplicitSpecializations = true; 6910 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6911 if (TempParamLists.get()[I]->size()) { 6912 isAllExplicitSpecializations = false; 6913 break; 6914 } 6915 } 6916 6917 // FIXME: don't ignore attributes. 6918 6919 // If it's explicit specializations all the way down, just forget 6920 // about the template header and build an appropriate non-templated 6921 // friend. TODO: for source fidelity, remember the headers. 6922 if (isAllExplicitSpecializations) { 6923 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6924 ElaboratedTypeKeyword Keyword 6925 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6926 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 6927 *Name, NameLoc); 6928 if (T.isNull()) 6929 return 0; 6930 6931 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6932 if (isa<DependentNameType>(T)) { 6933 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6934 TL.setKeywordLoc(TagLoc); 6935 TL.setQualifierLoc(QualifierLoc); 6936 TL.setNameLoc(NameLoc); 6937 } else { 6938 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6939 TL.setKeywordLoc(TagLoc); 6940 TL.setQualifierLoc(QualifierLoc); 6941 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6942 } 6943 6944 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6945 TSI, FriendLoc); 6946 Friend->setAccess(AS_public); 6947 CurContext->addDecl(Friend); 6948 return Friend; 6949 } 6950 6951 // Handle the case of a templated-scope friend class. e.g. 6952 // template <class T> class A<T>::B; 6953 // FIXME: we don't support these right now. 6954 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6955 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6956 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6957 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6958 TL.setKeywordLoc(TagLoc); 6959 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 6960 TL.setNameLoc(NameLoc); 6961 6962 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6963 TSI, FriendLoc); 6964 Friend->setAccess(AS_public); 6965 Friend->setUnsupportedFriend(true); 6966 CurContext->addDecl(Friend); 6967 return Friend; 6968} 6969 6970 6971/// Handle a friend type declaration. This works in tandem with 6972/// ActOnTag. 6973/// 6974/// Notes on friend class templates: 6975/// 6976/// We generally treat friend class declarations as if they were 6977/// declaring a class. So, for example, the elaborated type specifier 6978/// in a friend declaration is required to obey the restrictions of a 6979/// class-head (i.e. no typedefs in the scope chain), template 6980/// parameters are required to match up with simple template-ids, &c. 6981/// However, unlike when declaring a template specialization, it's 6982/// okay to refer to a template specialization without an empty 6983/// template parameter declaration, e.g. 6984/// friend class A<T>::B<unsigned>; 6985/// We permit this as a special case; if there are any template 6986/// parameters present at all, require proper matching, i.e. 6987/// template <> template <class T> friend class A<int>::B; 6988Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6989 MultiTemplateParamsArg TempParams) { 6990 SourceLocation Loc = DS.getSourceRange().getBegin(); 6991 6992 assert(DS.isFriendSpecified()); 6993 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6994 6995 // Try to convert the decl specifier to a type. This works for 6996 // friend templates because ActOnTag never produces a ClassTemplateDecl 6997 // for a TUK_Friend. 6998 Declarator TheDeclarator(DS, Declarator::MemberContext); 6999 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7000 QualType T = TSI->getType(); 7001 if (TheDeclarator.isInvalidType()) 7002 return 0; 7003 7004 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7005 return 0; 7006 7007 // This is definitely an error in C++98. It's probably meant to 7008 // be forbidden in C++0x, too, but the specification is just 7009 // poorly written. 7010 // 7011 // The problem is with declarations like the following: 7012 // template <T> friend A<T>::foo; 7013 // where deciding whether a class C is a friend or not now hinges 7014 // on whether there exists an instantiation of A that causes 7015 // 'foo' to equal C. There are restrictions on class-heads 7016 // (which we declare (by fiat) elaborated friend declarations to 7017 // be) that makes this tractable. 7018 // 7019 // FIXME: handle "template <> friend class A<T>;", which 7020 // is possibly well-formed? Who even knows? 7021 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7022 Diag(Loc, diag::err_tagless_friend_type_template) 7023 << DS.getSourceRange(); 7024 return 0; 7025 } 7026 7027 // C++98 [class.friend]p1: A friend of a class is a function 7028 // or class that is not a member of the class . . . 7029 // This is fixed in DR77, which just barely didn't make the C++03 7030 // deadline. It's also a very silly restriction that seriously 7031 // affects inner classes and which nobody else seems to implement; 7032 // thus we never diagnose it, not even in -pedantic. 7033 // 7034 // But note that we could warn about it: it's always useless to 7035 // friend one of your own members (it's not, however, worthless to 7036 // friend a member of an arbitrary specialization of your template). 7037 7038 Decl *D; 7039 if (unsigned NumTempParamLists = TempParams.size()) 7040 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7041 NumTempParamLists, 7042 TempParams.release(), 7043 TSI, 7044 DS.getFriendSpecLoc()); 7045 else 7046 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7047 7048 if (!D) 7049 return 0; 7050 7051 D->setAccess(AS_public); 7052 CurContext->addDecl(D); 7053 7054 return D; 7055} 7056 7057Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7058 MultiTemplateParamsArg TemplateParams) { 7059 const DeclSpec &DS = D.getDeclSpec(); 7060 7061 assert(DS.isFriendSpecified()); 7062 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7063 7064 SourceLocation Loc = D.getIdentifierLoc(); 7065 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7066 QualType T = TInfo->getType(); 7067 7068 // C++ [class.friend]p1 7069 // A friend of a class is a function or class.... 7070 // Note that this sees through typedefs, which is intended. 7071 // It *doesn't* see through dependent types, which is correct 7072 // according to [temp.arg.type]p3: 7073 // If a declaration acquires a function type through a 7074 // type dependent on a template-parameter and this causes 7075 // a declaration that does not use the syntactic form of a 7076 // function declarator to have a function type, the program 7077 // is ill-formed. 7078 if (!T->isFunctionType()) { 7079 Diag(Loc, diag::err_unexpected_friend); 7080 7081 // It might be worthwhile to try to recover by creating an 7082 // appropriate declaration. 7083 return 0; 7084 } 7085 7086 // C++ [namespace.memdef]p3 7087 // - If a friend declaration in a non-local class first declares a 7088 // class or function, the friend class or function is a member 7089 // of the innermost enclosing namespace. 7090 // - The name of the friend is not found by simple name lookup 7091 // until a matching declaration is provided in that namespace 7092 // scope (either before or after the class declaration granting 7093 // friendship). 7094 // - If a friend function is called, its name may be found by the 7095 // name lookup that considers functions from namespaces and 7096 // classes associated with the types of the function arguments. 7097 // - When looking for a prior declaration of a class or a function 7098 // declared as a friend, scopes outside the innermost enclosing 7099 // namespace scope are not considered. 7100 7101 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7102 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7103 DeclarationName Name = NameInfo.getName(); 7104 assert(Name); 7105 7106 // Check for unexpanded parameter packs. 7107 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7108 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7109 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7110 return 0; 7111 7112 // The context we found the declaration in, or in which we should 7113 // create the declaration. 7114 DeclContext *DC; 7115 Scope *DCScope = S; 7116 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7117 ForRedeclaration); 7118 7119 // FIXME: there are different rules in local classes 7120 7121 // There are four cases here. 7122 // - There's no scope specifier, in which case we just go to the 7123 // appropriate scope and look for a function or function template 7124 // there as appropriate. 7125 // Recover from invalid scope qualifiers as if they just weren't there. 7126 if (SS.isInvalid() || !SS.isSet()) { 7127 // C++0x [namespace.memdef]p3: 7128 // If the name in a friend declaration is neither qualified nor 7129 // a template-id and the declaration is a function or an 7130 // elaborated-type-specifier, the lookup to determine whether 7131 // the entity has been previously declared shall not consider 7132 // any scopes outside the innermost enclosing namespace. 7133 // C++0x [class.friend]p11: 7134 // If a friend declaration appears in a local class and the name 7135 // specified is an unqualified name, a prior declaration is 7136 // looked up without considering scopes that are outside the 7137 // innermost enclosing non-class scope. For a friend function 7138 // declaration, if there is no prior declaration, the program is 7139 // ill-formed. 7140 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7141 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7142 7143 // Find the appropriate context according to the above. 7144 DC = CurContext; 7145 while (true) { 7146 // Skip class contexts. If someone can cite chapter and verse 7147 // for this behavior, that would be nice --- it's what GCC and 7148 // EDG do, and it seems like a reasonable intent, but the spec 7149 // really only says that checks for unqualified existing 7150 // declarations should stop at the nearest enclosing namespace, 7151 // not that they should only consider the nearest enclosing 7152 // namespace. 7153 while (DC->isRecord()) 7154 DC = DC->getParent(); 7155 7156 LookupQualifiedName(Previous, DC); 7157 7158 // TODO: decide what we think about using declarations. 7159 if (isLocal || !Previous.empty()) 7160 break; 7161 7162 if (isTemplateId) { 7163 if (isa<TranslationUnitDecl>(DC)) break; 7164 } else { 7165 if (DC->isFileContext()) break; 7166 } 7167 DC = DC->getParent(); 7168 } 7169 7170 // C++ [class.friend]p1: A friend of a class is a function or 7171 // class that is not a member of the class . . . 7172 // C++0x changes this for both friend types and functions. 7173 // Most C++ 98 compilers do seem to give an error here, so 7174 // we do, too. 7175 if (!Previous.empty() && DC->Equals(CurContext) 7176 && !getLangOptions().CPlusPlus0x) 7177 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7178 7179 DCScope = getScopeForDeclContext(S, DC); 7180 7181 // - There's a non-dependent scope specifier, in which case we 7182 // compute it and do a previous lookup there for a function 7183 // or function template. 7184 } else if (!SS.getScopeRep()->isDependent()) { 7185 DC = computeDeclContext(SS); 7186 if (!DC) return 0; 7187 7188 if (RequireCompleteDeclContext(SS, DC)) return 0; 7189 7190 LookupQualifiedName(Previous, DC); 7191 7192 // Ignore things found implicitly in the wrong scope. 7193 // TODO: better diagnostics for this case. Suggesting the right 7194 // qualified scope would be nice... 7195 LookupResult::Filter F = Previous.makeFilter(); 7196 while (F.hasNext()) { 7197 NamedDecl *D = F.next(); 7198 if (!DC->InEnclosingNamespaceSetOf( 7199 D->getDeclContext()->getRedeclContext())) 7200 F.erase(); 7201 } 7202 F.done(); 7203 7204 if (Previous.empty()) { 7205 D.setInvalidType(); 7206 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7207 return 0; 7208 } 7209 7210 // C++ [class.friend]p1: A friend of a class is a function or 7211 // class that is not a member of the class . . . 7212 if (DC->Equals(CurContext)) 7213 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7214 7215 // - There's a scope specifier that does not match any template 7216 // parameter lists, in which case we use some arbitrary context, 7217 // create a method or method template, and wait for instantiation. 7218 // - There's a scope specifier that does match some template 7219 // parameter lists, which we don't handle right now. 7220 } else { 7221 DC = CurContext; 7222 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7223 } 7224 7225 if (!DC->isRecord()) { 7226 // This implies that it has to be an operator or function. 7227 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7228 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7229 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7230 Diag(Loc, diag::err_introducing_special_friend) << 7231 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7232 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7233 return 0; 7234 } 7235 } 7236 7237 bool Redeclaration = false; 7238 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7239 move(TemplateParams), 7240 IsDefinition, 7241 Redeclaration); 7242 if (!ND) return 0; 7243 7244 assert(ND->getDeclContext() == DC); 7245 assert(ND->getLexicalDeclContext() == CurContext); 7246 7247 // Add the function declaration to the appropriate lookup tables, 7248 // adjusting the redeclarations list as necessary. We don't 7249 // want to do this yet if the friending class is dependent. 7250 // 7251 // Also update the scope-based lookup if the target context's 7252 // lookup context is in lexical scope. 7253 if (!CurContext->isDependentContext()) { 7254 DC = DC->getRedeclContext(); 7255 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7256 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7257 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7258 } 7259 7260 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7261 D.getIdentifierLoc(), ND, 7262 DS.getFriendSpecLoc()); 7263 FrD->setAccess(AS_public); 7264 CurContext->addDecl(FrD); 7265 7266 if (ND->isInvalidDecl()) 7267 FrD->setInvalidDecl(); 7268 else { 7269 FunctionDecl *FD; 7270 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7271 FD = FTD->getTemplatedDecl(); 7272 else 7273 FD = cast<FunctionDecl>(ND); 7274 7275 // Mark templated-scope function declarations as unsupported. 7276 if (FD->getNumTemplateParameterLists()) 7277 FrD->setUnsupportedFriend(true); 7278 } 7279 7280 return ND; 7281} 7282 7283void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7284 AdjustDeclIfTemplate(Dcl); 7285 7286 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7287 if (!Fn) { 7288 Diag(DelLoc, diag::err_deleted_non_function); 7289 return; 7290 } 7291 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7292 Diag(DelLoc, diag::err_deleted_decl_not_first); 7293 Diag(Prev->getLocation(), diag::note_previous_declaration); 7294 // If the declaration wasn't the first, we delete the function anyway for 7295 // recovery. 7296 } 7297 Fn->setDeleted(); 7298} 7299 7300static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7301 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7302 Stmt *SubStmt = *CI; 7303 if (!SubStmt) 7304 continue; 7305 if (isa<ReturnStmt>(SubStmt)) 7306 Self.Diag(SubStmt->getSourceRange().getBegin(), 7307 diag::err_return_in_constructor_handler); 7308 if (!isa<Expr>(SubStmt)) 7309 SearchForReturnInStmt(Self, SubStmt); 7310 } 7311} 7312 7313void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7314 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7315 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7316 SearchForReturnInStmt(*this, Handler); 7317 } 7318} 7319 7320bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7321 const CXXMethodDecl *Old) { 7322 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7323 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7324 7325 if (Context.hasSameType(NewTy, OldTy) || 7326 NewTy->isDependentType() || OldTy->isDependentType()) 7327 return false; 7328 7329 // Check if the return types are covariant 7330 QualType NewClassTy, OldClassTy; 7331 7332 /// Both types must be pointers or references to classes. 7333 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7334 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7335 NewClassTy = NewPT->getPointeeType(); 7336 OldClassTy = OldPT->getPointeeType(); 7337 } 7338 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7339 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7340 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7341 NewClassTy = NewRT->getPointeeType(); 7342 OldClassTy = OldRT->getPointeeType(); 7343 } 7344 } 7345 } 7346 7347 // The return types aren't either both pointers or references to a class type. 7348 if (NewClassTy.isNull()) { 7349 Diag(New->getLocation(), 7350 diag::err_different_return_type_for_overriding_virtual_function) 7351 << New->getDeclName() << NewTy << OldTy; 7352 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7353 7354 return true; 7355 } 7356 7357 // C++ [class.virtual]p6: 7358 // If the return type of D::f differs from the return type of B::f, the 7359 // class type in the return type of D::f shall be complete at the point of 7360 // declaration of D::f or shall be the class type D. 7361 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7362 if (!RT->isBeingDefined() && 7363 RequireCompleteType(New->getLocation(), NewClassTy, 7364 PDiag(diag::err_covariant_return_incomplete) 7365 << New->getDeclName())) 7366 return true; 7367 } 7368 7369 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7370 // Check if the new class derives from the old class. 7371 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7372 Diag(New->getLocation(), 7373 diag::err_covariant_return_not_derived) 7374 << New->getDeclName() << NewTy << OldTy; 7375 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7376 return true; 7377 } 7378 7379 // Check if we the conversion from derived to base is valid. 7380 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7381 diag::err_covariant_return_inaccessible_base, 7382 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7383 // FIXME: Should this point to the return type? 7384 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7385 // FIXME: this note won't trigger for delayed access control 7386 // diagnostics, and it's impossible to get an undelayed error 7387 // here from access control during the original parse because 7388 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7389 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7390 return true; 7391 } 7392 } 7393 7394 // The qualifiers of the return types must be the same. 7395 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7396 Diag(New->getLocation(), 7397 diag::err_covariant_return_type_different_qualifications) 7398 << New->getDeclName() << NewTy << OldTy; 7399 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7400 return true; 7401 }; 7402 7403 7404 // The new class type must have the same or less qualifiers as the old type. 7405 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7406 Diag(New->getLocation(), 7407 diag::err_covariant_return_type_class_type_more_qualified) 7408 << New->getDeclName() << NewTy << OldTy; 7409 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7410 return true; 7411 }; 7412 7413 return false; 7414} 7415 7416/// \brief Mark the given method pure. 7417/// 7418/// \param Method the method to be marked pure. 7419/// 7420/// \param InitRange the source range that covers the "0" initializer. 7421bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7422 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7423 Method->setPure(); 7424 return false; 7425 } 7426 7427 if (!Method->isInvalidDecl()) 7428 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7429 << Method->getDeclName() << InitRange; 7430 return true; 7431} 7432 7433/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7434/// an initializer for the out-of-line declaration 'Dcl'. The scope 7435/// is a fresh scope pushed for just this purpose. 7436/// 7437/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7438/// static data member of class X, names should be looked up in the scope of 7439/// class X. 7440void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7441 // If there is no declaration, there was an error parsing it. 7442 if (D == 0) return; 7443 7444 // We should only get called for declarations with scope specifiers, like: 7445 // int foo::bar; 7446 assert(D->isOutOfLine()); 7447 EnterDeclaratorContext(S, D->getDeclContext()); 7448} 7449 7450/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7451/// initializer for the out-of-line declaration 'D'. 7452void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7453 // If there is no declaration, there was an error parsing it. 7454 if (D == 0) return; 7455 7456 assert(D->isOutOfLine()); 7457 ExitDeclaratorContext(S); 7458} 7459 7460/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7461/// C++ if/switch/while/for statement. 7462/// e.g: "if (int x = f()) {...}" 7463DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7464 // C++ 6.4p2: 7465 // The declarator shall not specify a function or an array. 7466 // The type-specifier-seq shall not contain typedef and shall not declare a 7467 // new class or enumeration. 7468 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7469 "Parser allowed 'typedef' as storage class of condition decl."); 7470 7471 TagDecl *OwnedTag = 0; 7472 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7473 QualType Ty = TInfo->getType(); 7474 7475 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7476 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7477 // would be created and CXXConditionDeclExpr wants a VarDecl. 7478 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7479 << D.getSourceRange(); 7480 return DeclResult(); 7481 } else if (OwnedTag && OwnedTag->isDefinition()) { 7482 // The type-specifier-seq shall not declare a new class or enumeration. 7483 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7484 } 7485 7486 Decl *Dcl = ActOnDeclarator(S, D); 7487 if (!Dcl) 7488 return DeclResult(); 7489 7490 return Dcl; 7491} 7492 7493void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7494 bool DefinitionRequired) { 7495 // Ignore any vtable uses in unevaluated operands or for classes that do 7496 // not have a vtable. 7497 if (!Class->isDynamicClass() || Class->isDependentContext() || 7498 CurContext->isDependentContext() || 7499 ExprEvalContexts.back().Context == Unevaluated) 7500 return; 7501 7502 // Try to insert this class into the map. 7503 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7504 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7505 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7506 if (!Pos.second) { 7507 // If we already had an entry, check to see if we are promoting this vtable 7508 // to required a definition. If so, we need to reappend to the VTableUses 7509 // list, since we may have already processed the first entry. 7510 if (DefinitionRequired && !Pos.first->second) { 7511 Pos.first->second = true; 7512 } else { 7513 // Otherwise, we can early exit. 7514 return; 7515 } 7516 } 7517 7518 // Local classes need to have their virtual members marked 7519 // immediately. For all other classes, we mark their virtual members 7520 // at the end of the translation unit. 7521 if (Class->isLocalClass()) 7522 MarkVirtualMembersReferenced(Loc, Class); 7523 else 7524 VTableUses.push_back(std::make_pair(Class, Loc)); 7525} 7526 7527bool Sema::DefineUsedVTables() { 7528 if (VTableUses.empty()) 7529 return false; 7530 7531 // Note: The VTableUses vector could grow as a result of marking 7532 // the members of a class as "used", so we check the size each 7533 // time through the loop and prefer indices (with are stable) to 7534 // iterators (which are not). 7535 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7536 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7537 if (!Class) 7538 continue; 7539 7540 SourceLocation Loc = VTableUses[I].second; 7541 7542 // If this class has a key function, but that key function is 7543 // defined in another translation unit, we don't need to emit the 7544 // vtable even though we're using it. 7545 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7546 if (KeyFunction && !KeyFunction->hasBody()) { 7547 switch (KeyFunction->getTemplateSpecializationKind()) { 7548 case TSK_Undeclared: 7549 case TSK_ExplicitSpecialization: 7550 case TSK_ExplicitInstantiationDeclaration: 7551 // The key function is in another translation unit. 7552 continue; 7553 7554 case TSK_ExplicitInstantiationDefinition: 7555 case TSK_ImplicitInstantiation: 7556 // We will be instantiating the key function. 7557 break; 7558 } 7559 } else if (!KeyFunction) { 7560 // If we have a class with no key function that is the subject 7561 // of an explicit instantiation declaration, suppress the 7562 // vtable; it will live with the explicit instantiation 7563 // definition. 7564 bool IsExplicitInstantiationDeclaration 7565 = Class->getTemplateSpecializationKind() 7566 == TSK_ExplicitInstantiationDeclaration; 7567 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7568 REnd = Class->redecls_end(); 7569 R != REnd; ++R) { 7570 TemplateSpecializationKind TSK 7571 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7572 if (TSK == TSK_ExplicitInstantiationDeclaration) 7573 IsExplicitInstantiationDeclaration = true; 7574 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7575 IsExplicitInstantiationDeclaration = false; 7576 break; 7577 } 7578 } 7579 7580 if (IsExplicitInstantiationDeclaration) 7581 continue; 7582 } 7583 7584 // Mark all of the virtual members of this class as referenced, so 7585 // that we can build a vtable. Then, tell the AST consumer that a 7586 // vtable for this class is required. 7587 MarkVirtualMembersReferenced(Loc, Class); 7588 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7589 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7590 7591 // Optionally warn if we're emitting a weak vtable. 7592 if (Class->getLinkage() == ExternalLinkage && 7593 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7594 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7595 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7596 } 7597 } 7598 VTableUses.clear(); 7599 7600 return true; 7601} 7602 7603void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7604 const CXXRecordDecl *RD) { 7605 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7606 e = RD->method_end(); i != e; ++i) { 7607 CXXMethodDecl *MD = *i; 7608 7609 // C++ [basic.def.odr]p2: 7610 // [...] A virtual member function is used if it is not pure. [...] 7611 if (MD->isVirtual() && !MD->isPure()) 7612 MarkDeclarationReferenced(Loc, MD); 7613 } 7614 7615 // Only classes that have virtual bases need a VTT. 7616 if (RD->getNumVBases() == 0) 7617 return; 7618 7619 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7620 e = RD->bases_end(); i != e; ++i) { 7621 const CXXRecordDecl *Base = 7622 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7623 if (Base->getNumVBases() == 0) 7624 continue; 7625 MarkVirtualMembersReferenced(Loc, Base); 7626 } 7627} 7628 7629/// SetIvarInitializers - This routine builds initialization ASTs for the 7630/// Objective-C implementation whose ivars need be initialized. 7631void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7632 if (!getLangOptions().CPlusPlus) 7633 return; 7634 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7635 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7636 CollectIvarsToConstructOrDestruct(OID, ivars); 7637 if (ivars.empty()) 7638 return; 7639 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7640 for (unsigned i = 0; i < ivars.size(); i++) { 7641 FieldDecl *Field = ivars[i]; 7642 if (Field->isInvalidDecl()) 7643 continue; 7644 7645 CXXCtorInitializer *Member; 7646 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7647 InitializationKind InitKind = 7648 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7649 7650 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7651 ExprResult MemberInit = 7652 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7653 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7654 // Note, MemberInit could actually come back empty if no initialization 7655 // is required (e.g., because it would call a trivial default constructor) 7656 if (!MemberInit.get() || MemberInit.isInvalid()) 7657 continue; 7658 7659 Member = 7660 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7661 SourceLocation(), 7662 MemberInit.takeAs<Expr>(), 7663 SourceLocation()); 7664 AllToInit.push_back(Member); 7665 7666 // Be sure that the destructor is accessible and is marked as referenced. 7667 if (const RecordType *RecordTy 7668 = Context.getBaseElementType(Field->getType()) 7669 ->getAs<RecordType>()) { 7670 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7671 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7672 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7673 CheckDestructorAccess(Field->getLocation(), Destructor, 7674 PDiag(diag::err_access_dtor_ivar) 7675 << Context.getBaseElementType(Field->getType())); 7676 } 7677 } 7678 } 7679 ObjCImplementation->setIvarInitializers(Context, 7680 AllToInit.data(), AllToInit.size()); 7681 } 7682} 7683