SemaDeclCXX.cpp revision 5bfe232d1f07a6fd160fcf82c277c055a412a1c0
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++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 that the default argument is well-formed 181 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 182 if (DefaultArgChecker.Visit(DefaultArg)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 188} 189 190/// ActOnParamUnparsedDefaultArgument - We've seen a default 191/// argument for a function parameter, but we can't parse it yet 192/// because we're inside a class definition. Note that this default 193/// argument will be parsed later. 194void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 195 SourceLocation EqualLoc, 196 SourceLocation ArgLoc) { 197 if (!param) 198 return; 199 200 ParmVarDecl *Param = cast<ParmVarDecl>(param); 201 if (Param) 202 Param->setUnparsedDefaultArg(); 203 204 UnparsedDefaultArgLocs[Param] = ArgLoc; 205} 206 207/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 208/// the default argument for the parameter param failed. 209void Sema::ActOnParamDefaultArgumentError(Decl *param) { 210 if (!param) 211 return; 212 213 ParmVarDecl *Param = cast<ParmVarDecl>(param); 214 215 Param->setInvalidDecl(); 216 217 UnparsedDefaultArgLocs.erase(Param); 218} 219 220/// CheckExtraCXXDefaultArguments - Check for any extra default 221/// arguments in the declarator, which is not a function declaration 222/// or definition and therefore is not permitted to have default 223/// arguments. This routine should be invoked for every declarator 224/// that is not a function declaration or definition. 225void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 226 // C++ [dcl.fct.default]p3 227 // A default argument expression shall be specified only in the 228 // parameter-declaration-clause of a function declaration or in a 229 // template-parameter (14.1). It shall not be specified for a 230 // parameter pack. If it is specified in a 231 // parameter-declaration-clause, it shall not occur within a 232 // declarator or abstract-declarator of a parameter-declaration. 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &chunk = D.getTypeObject(i); 235 if (chunk.Kind == DeclaratorChunk::Function) { 236 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 237 ParmVarDecl *Param = 238 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 239 if (Param->hasUnparsedDefaultArg()) { 240 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 241 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 242 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 243 delete Toks; 244 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 245 } else if (Param->getDefaultArg()) { 246 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 247 << Param->getDefaultArg()->getSourceRange(); 248 Param->setDefaultArg(0); 249 } 250 } 251 } 252 } 253} 254 255// MergeCXXFunctionDecl - Merge two declarations of the same C++ 256// function, once we already know that they have the same 257// type. Subroutine of MergeFunctionDecl. Returns true if there was an 258// error, false otherwise. 259bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 260 bool Invalid = false; 261 262 // C++ [dcl.fct.default]p4: 263 // For non-template functions, default arguments can be added in 264 // later declarations of a function in the same 265 // scope. Declarations in different scopes have completely 266 // distinct sets of default arguments. That is, declarations in 267 // inner scopes do not acquire default arguments from 268 // declarations in outer scopes, and vice versa. In a given 269 // function declaration, all parameters subsequent to a 270 // parameter with a default argument shall have default 271 // arguments supplied in this or previous declarations. A 272 // default argument shall not be redefined by a later 273 // declaration (not even to the same value). 274 // 275 // C++ [dcl.fct.default]p6: 276 // Except for member functions of class templates, the default arguments 277 // in a member function definition that appears outside of the class 278 // definition are added to the set of default arguments provided by the 279 // member function declaration in the class definition. 280 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 281 ParmVarDecl *OldParam = Old->getParamDecl(p); 282 ParmVarDecl *NewParam = New->getParamDecl(p); 283 284 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 285 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 286 // hint here. Alternatively, we could walk the type-source information 287 // for NewParam to find the last source location in the type... but it 288 // isn't worth the effort right now. This is the kind of test case that 289 // is hard to get right: 290 291 // int f(int); 292 // void g(int (*fp)(int) = f); 293 // void g(int (*fp)(int) = &f); 294 Diag(NewParam->getLocation(), 295 diag::err_param_default_argument_redefinition) 296 << NewParam->getDefaultArgRange(); 297 298 // Look for the function declaration where the default argument was 299 // actually written, which may be a declaration prior to Old. 300 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 301 Older; Older = Older->getPreviousDeclaration()) { 302 if (!Older->getParamDecl(p)->hasDefaultArg()) 303 break; 304 305 OldParam = Older->getParamDecl(p); 306 } 307 308 Diag(OldParam->getLocation(), diag::note_previous_definition) 309 << OldParam->getDefaultArgRange(); 310 Invalid = true; 311 } else if (OldParam->hasDefaultArg()) { 312 // Merge the old default argument into the new parameter. 313 // It's important to use getInit() here; getDefaultArg() 314 // strips off any top-level ExprWithCleanups. 315 NewParam->setHasInheritedDefaultArg(); 316 if (OldParam->hasUninstantiatedDefaultArg()) 317 NewParam->setUninstantiatedDefaultArg( 318 OldParam->getUninstantiatedDefaultArg()); 319 else 320 NewParam->setDefaultArg(OldParam->getInit()); 321 } else if (NewParam->hasDefaultArg()) { 322 if (New->getDescribedFunctionTemplate()) { 323 // Paragraph 4, quoted above, only applies to non-template functions. 324 Diag(NewParam->getLocation(), 325 diag::err_param_default_argument_template_redecl) 326 << NewParam->getDefaultArgRange(); 327 Diag(Old->getLocation(), diag::note_template_prev_declaration) 328 << false; 329 } else if (New->getTemplateSpecializationKind() 330 != TSK_ImplicitInstantiation && 331 New->getTemplateSpecializationKind() != TSK_Undeclared) { 332 // C++ [temp.expr.spec]p21: 333 // Default function arguments shall not be specified in a declaration 334 // or a definition for one of the following explicit specializations: 335 // - the explicit specialization of a function template; 336 // - the explicit specialization of a member function template; 337 // - the explicit specialization of a member function of a class 338 // template where the class template specialization to which the 339 // member function specialization belongs is implicitly 340 // instantiated. 341 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 342 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 343 << New->getDeclName() 344 << NewParam->getDefaultArgRange(); 345 } else if (New->getDeclContext()->isDependentContext()) { 346 // C++ [dcl.fct.default]p6 (DR217): 347 // Default arguments for a member function of a class template shall 348 // be specified on the initial declaration of the member function 349 // within the class template. 350 // 351 // Reading the tea leaves a bit in DR217 and its reference to DR205 352 // leads me to the conclusion that one cannot add default function 353 // arguments for an out-of-line definition of a member function of a 354 // dependent type. 355 int WhichKind = 2; 356 if (CXXRecordDecl *Record 357 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 358 if (Record->getDescribedClassTemplate()) 359 WhichKind = 0; 360 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 361 WhichKind = 1; 362 else 363 WhichKind = 2; 364 } 365 366 Diag(NewParam->getLocation(), 367 diag::err_param_default_argument_member_template_redecl) 368 << WhichKind 369 << NewParam->getDefaultArgRange(); 370 } 371 } 372 } 373 374 if (CheckEquivalentExceptionSpec(Old, New)) 375 Invalid = true; 376 377 return Invalid; 378} 379 380/// CheckCXXDefaultArguments - Verify that the default arguments for a 381/// function declaration are well-formed according to C++ 382/// [dcl.fct.default]. 383void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 384 unsigned NumParams = FD->getNumParams(); 385 unsigned p; 386 387 // Find first parameter with a default argument 388 for (p = 0; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (Param->hasDefaultArg()) 391 break; 392 } 393 394 // C++ [dcl.fct.default]p4: 395 // In a given function declaration, all parameters 396 // subsequent to a parameter with a default argument shall 397 // have default arguments supplied in this or previous 398 // declarations. A default argument shall not be redefined 399 // by a later declaration (not even to the same value). 400 unsigned LastMissingDefaultArg = 0; 401 for (; p < NumParams; ++p) { 402 ParmVarDecl *Param = FD->getParamDecl(p); 403 if (!Param->hasDefaultArg()) { 404 if (Param->isInvalidDecl()) 405 /* We already complained about this parameter. */; 406 else if (Param->getIdentifier()) 407 Diag(Param->getLocation(), 408 diag::err_param_default_argument_missing_name) 409 << Param->getIdentifier(); 410 else 411 Diag(Param->getLocation(), 412 diag::err_param_default_argument_missing); 413 414 LastMissingDefaultArg = p; 415 } 416 } 417 418 if (LastMissingDefaultArg > 0) { 419 // Some default arguments were missing. Clear out all of the 420 // default arguments up to (and including) the last missing 421 // default argument, so that we leave the function parameters 422 // in a semantically valid state. 423 for (p = 0; p <= LastMissingDefaultArg; ++p) { 424 ParmVarDecl *Param = FD->getParamDecl(p); 425 if (Param->hasDefaultArg()) { 426 Param->setDefaultArg(0); 427 } 428 } 429 } 430} 431 432/// isCurrentClassName - Determine whether the identifier II is the 433/// name of the class type currently being defined. In the case of 434/// nested classes, this will only return true if II is the name of 435/// the innermost class. 436bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 437 const CXXScopeSpec *SS) { 438 assert(getLangOptions().CPlusPlus && "No class names in C!"); 439 440 CXXRecordDecl *CurDecl; 441 if (SS && SS->isSet() && !SS->isInvalid()) { 442 DeclContext *DC = computeDeclContext(*SS, true); 443 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 444 } else 445 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 446 447 if (CurDecl && CurDecl->getIdentifier()) 448 return &II == CurDecl->getIdentifier(); 449 else 450 return false; 451} 452 453/// \brief Check the validity of a C++ base class specifier. 454/// 455/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 456/// and returns NULL otherwise. 457CXXBaseSpecifier * 458Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 459 SourceRange SpecifierRange, 460 bool Virtual, AccessSpecifier Access, 461 TypeSourceInfo *TInfo) { 462 QualType BaseType = TInfo->getType(); 463 464 // C++ [class.union]p1: 465 // A union shall not have base classes. 466 if (Class->isUnion()) { 467 Diag(Class->getLocation(), diag::err_base_clause_on_union) 468 << SpecifierRange; 469 return 0; 470 } 471 472 if (BaseType->isDependentType()) 473 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 474 Class->getTagKind() == TTK_Class, 475 Access, TInfo); 476 477 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 478 479 // Base specifiers must be record types. 480 if (!BaseType->isRecordType()) { 481 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 482 return 0; 483 } 484 485 // C++ [class.union]p1: 486 // A union shall not be used as a base class. 487 if (BaseType->isUnionType()) { 488 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 489 return 0; 490 } 491 492 // C++ [class.derived]p2: 493 // The class-name in a base-specifier shall not be an incompletely 494 // defined class. 495 if (RequireCompleteType(BaseLoc, BaseType, 496 PDiag(diag::err_incomplete_base_class) 497 << SpecifierRange)) { 498 Class->setInvalidDecl(); 499 return 0; 500 } 501 502 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 503 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 504 assert(BaseDecl && "Record type has no declaration"); 505 BaseDecl = BaseDecl->getDefinition(); 506 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 507 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 508 assert(CXXBaseDecl && "Base type is not a C++ type"); 509 510 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 511 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 512 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 513 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 514 << BaseType; 515 return 0; 516 } 517 518 if (BaseDecl->isInvalidDecl()) 519 Class->setInvalidDecl(); 520 521 // Create the base specifier. 522 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 523 Class->getTagKind() == TTK_Class, 524 Access, TInfo); 525} 526 527/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 528/// one entry in the base class list of a class specifier, for 529/// example: 530/// class foo : public bar, virtual private baz { 531/// 'public bar' and 'virtual private baz' are each base-specifiers. 532BaseResult 533Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 534 bool Virtual, AccessSpecifier Access, 535 ParsedType basetype, SourceLocation BaseLoc) { 536 if (!classdecl) 537 return true; 538 539 AdjustDeclIfTemplate(classdecl); 540 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 541 if (!Class) 542 return true; 543 544 TypeSourceInfo *TInfo = 0; 545 GetTypeFromParser(basetype, &TInfo); 546 547 if (DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 548 UPPC_BaseType)) 549 return true; 550 551 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 552 Virtual, Access, TInfo)) 553 return BaseSpec; 554 555 return true; 556} 557 558/// \brief Performs the actual work of attaching the given base class 559/// specifiers to a C++ class. 560bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 561 unsigned NumBases) { 562 if (NumBases == 0) 563 return false; 564 565 // Used to keep track of which base types we have already seen, so 566 // that we can properly diagnose redundant direct base types. Note 567 // that the key is always the unqualified canonical type of the base 568 // class. 569 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 570 571 // Copy non-redundant base specifiers into permanent storage. 572 unsigned NumGoodBases = 0; 573 bool Invalid = false; 574 for (unsigned idx = 0; idx < NumBases; ++idx) { 575 QualType NewBaseType 576 = Context.getCanonicalType(Bases[idx]->getType()); 577 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 578 if (!Class->hasObjectMember()) { 579 if (const RecordType *FDTTy = 580 NewBaseType.getTypePtr()->getAs<RecordType>()) 581 if (FDTTy->getDecl()->hasObjectMember()) 582 Class->setHasObjectMember(true); 583 } 584 585 if (KnownBaseTypes[NewBaseType]) { 586 // C++ [class.mi]p3: 587 // A class shall not be specified as a direct base class of a 588 // derived class more than once. 589 Diag(Bases[idx]->getSourceRange().getBegin(), 590 diag::err_duplicate_base_class) 591 << KnownBaseTypes[NewBaseType]->getType() 592 << Bases[idx]->getSourceRange(); 593 594 // Delete the duplicate base class specifier; we're going to 595 // overwrite its pointer later. 596 Context.Deallocate(Bases[idx]); 597 598 Invalid = true; 599 } else { 600 // Okay, add this new base class. 601 KnownBaseTypes[NewBaseType] = Bases[idx]; 602 Bases[NumGoodBases++] = Bases[idx]; 603 } 604 } 605 606 // Attach the remaining base class specifiers to the derived class. 607 Class->setBases(Bases, NumGoodBases); 608 609 // Delete the remaining (good) base class specifiers, since their 610 // data has been copied into the CXXRecordDecl. 611 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 612 Context.Deallocate(Bases[idx]); 613 614 return Invalid; 615} 616 617/// ActOnBaseSpecifiers - Attach the given base specifiers to the 618/// class, after checking whether there are any duplicate base 619/// classes. 620void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 621 unsigned NumBases) { 622 if (!ClassDecl || !Bases || !NumBases) 623 return; 624 625 AdjustDeclIfTemplate(ClassDecl); 626 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 627 (CXXBaseSpecifier**)(Bases), NumBases); 628} 629 630static CXXRecordDecl *GetClassForType(QualType T) { 631 if (const RecordType *RT = T->getAs<RecordType>()) 632 return cast<CXXRecordDecl>(RT->getDecl()); 633 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 634 return ICT->getDecl(); 635 else 636 return 0; 637} 638 639/// \brief Determine whether the type \p Derived is a C++ class that is 640/// derived from the type \p Base. 641bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 642 if (!getLangOptions().CPlusPlus) 643 return false; 644 645 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 646 if (!DerivedRD) 647 return false; 648 649 CXXRecordDecl *BaseRD = GetClassForType(Base); 650 if (!BaseRD) 651 return false; 652 653 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 654 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 655} 656 657/// \brief Determine whether the type \p Derived is a C++ class that is 658/// derived from the type \p Base. 659bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 660 if (!getLangOptions().CPlusPlus) 661 return false; 662 663 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 664 if (!DerivedRD) 665 return false; 666 667 CXXRecordDecl *BaseRD = GetClassForType(Base); 668 if (!BaseRD) 669 return false; 670 671 return DerivedRD->isDerivedFrom(BaseRD, Paths); 672} 673 674void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 675 CXXCastPath &BasePathArray) { 676 assert(BasePathArray.empty() && "Base path array must be empty!"); 677 assert(Paths.isRecordingPaths() && "Must record paths!"); 678 679 const CXXBasePath &Path = Paths.front(); 680 681 // We first go backward and check if we have a virtual base. 682 // FIXME: It would be better if CXXBasePath had the base specifier for 683 // the nearest virtual base. 684 unsigned Start = 0; 685 for (unsigned I = Path.size(); I != 0; --I) { 686 if (Path[I - 1].Base->isVirtual()) { 687 Start = I - 1; 688 break; 689 } 690 } 691 692 // Now add all bases. 693 for (unsigned I = Start, E = Path.size(); I != E; ++I) 694 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 695} 696 697/// \brief Determine whether the given base path includes a virtual 698/// base class. 699bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 700 for (CXXCastPath::const_iterator B = BasePath.begin(), 701 BEnd = BasePath.end(); 702 B != BEnd; ++B) 703 if ((*B)->isVirtual()) 704 return true; 705 706 return false; 707} 708 709/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 710/// conversion (where Derived and Base are class types) is 711/// well-formed, meaning that the conversion is unambiguous (and 712/// that all of the base classes are accessible). Returns true 713/// and emits a diagnostic if the code is ill-formed, returns false 714/// otherwise. Loc is the location where this routine should point to 715/// if there is an error, and Range is the source range to highlight 716/// if there is an error. 717bool 718Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 719 unsigned InaccessibleBaseID, 720 unsigned AmbigiousBaseConvID, 721 SourceLocation Loc, SourceRange Range, 722 DeclarationName Name, 723 CXXCastPath *BasePath) { 724 // First, determine whether the path from Derived to Base is 725 // ambiguous. This is slightly more expensive than checking whether 726 // the Derived to Base conversion exists, because here we need to 727 // explore multiple paths to determine if there is an ambiguity. 728 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 729 /*DetectVirtual=*/false); 730 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 731 assert(DerivationOkay && 732 "Can only be used with a derived-to-base conversion"); 733 (void)DerivationOkay; 734 735 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 736 if (InaccessibleBaseID) { 737 // Check that the base class can be accessed. 738 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 739 InaccessibleBaseID)) { 740 case AR_inaccessible: 741 return true; 742 case AR_accessible: 743 case AR_dependent: 744 case AR_delayed: 745 break; 746 } 747 } 748 749 // Build a base path if necessary. 750 if (BasePath) 751 BuildBasePathArray(Paths, *BasePath); 752 return false; 753 } 754 755 // We know that the derived-to-base conversion is ambiguous, and 756 // we're going to produce a diagnostic. Perform the derived-to-base 757 // search just one more time to compute all of the possible paths so 758 // that we can print them out. This is more expensive than any of 759 // the previous derived-to-base checks we've done, but at this point 760 // performance isn't as much of an issue. 761 Paths.clear(); 762 Paths.setRecordingPaths(true); 763 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 764 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 765 (void)StillOkay; 766 767 // Build up a textual representation of the ambiguous paths, e.g., 768 // D -> B -> A, that will be used to illustrate the ambiguous 769 // conversions in the diagnostic. We only print one of the paths 770 // to each base class subobject. 771 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 772 773 Diag(Loc, AmbigiousBaseConvID) 774 << Derived << Base << PathDisplayStr << Range << Name; 775 return true; 776} 777 778bool 779Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 780 SourceLocation Loc, SourceRange Range, 781 CXXCastPath *BasePath, 782 bool IgnoreAccess) { 783 return CheckDerivedToBaseConversion(Derived, Base, 784 IgnoreAccess ? 0 785 : diag::err_upcast_to_inaccessible_base, 786 diag::err_ambiguous_derived_to_base_conv, 787 Loc, Range, DeclarationName(), 788 BasePath); 789} 790 791 792/// @brief Builds a string representing ambiguous paths from a 793/// specific derived class to different subobjects of the same base 794/// class. 795/// 796/// This function builds a string that can be used in error messages 797/// to show the different paths that one can take through the 798/// inheritance hierarchy to go from the derived class to different 799/// subobjects of a base class. The result looks something like this: 800/// @code 801/// struct D -> struct B -> struct A 802/// struct D -> struct C -> struct A 803/// @endcode 804std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 805 std::string PathDisplayStr; 806 std::set<unsigned> DisplayedPaths; 807 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 808 Path != Paths.end(); ++Path) { 809 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 810 // We haven't displayed a path to this particular base 811 // class subobject yet. 812 PathDisplayStr += "\n "; 813 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 814 for (CXXBasePath::const_iterator Element = Path->begin(); 815 Element != Path->end(); ++Element) 816 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 817 } 818 } 819 820 return PathDisplayStr; 821} 822 823//===----------------------------------------------------------------------===// 824// C++ class member Handling 825//===----------------------------------------------------------------------===// 826 827/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 828Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 829 SourceLocation ASLoc, 830 SourceLocation ColonLoc) { 831 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 832 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 833 ASLoc, ColonLoc); 834 CurContext->addHiddenDecl(ASDecl); 835 return ASDecl; 836} 837 838/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 839/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 840/// bitfield width if there is one and 'InitExpr' specifies the initializer if 841/// any. 842Decl * 843Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 844 MultiTemplateParamsArg TemplateParameterLists, 845 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 846 bool Deleted) { 847 const DeclSpec &DS = D.getDeclSpec(); 848 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 849 DeclarationName Name = NameInfo.getName(); 850 SourceLocation Loc = NameInfo.getLoc(); 851 852 // For anonymous bitfields, the location should point to the type. 853 if (Loc.isInvalid()) 854 Loc = D.getSourceRange().getBegin(); 855 856 Expr *BitWidth = static_cast<Expr*>(BW); 857 Expr *Init = static_cast<Expr*>(InitExpr); 858 859 assert(isa<CXXRecordDecl>(CurContext)); 860 assert(!DS.isFriendSpecified()); 861 862 bool isFunc = false; 863 if (D.isFunctionDeclarator()) 864 isFunc = true; 865 else if (D.getNumTypeObjects() == 0 && 866 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 867 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 868 isFunc = TDType->isFunctionType(); 869 } 870 871 // C++ 9.2p6: A member shall not be declared to have automatic storage 872 // duration (auto, register) or with the extern storage-class-specifier. 873 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 874 // data members and cannot be applied to names declared const or static, 875 // and cannot be applied to reference members. 876 switch (DS.getStorageClassSpec()) { 877 case DeclSpec::SCS_unspecified: 878 case DeclSpec::SCS_typedef: 879 case DeclSpec::SCS_static: 880 // FALL THROUGH. 881 break; 882 case DeclSpec::SCS_mutable: 883 if (isFunc) { 884 if (DS.getStorageClassSpecLoc().isValid()) 885 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 886 else 887 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 888 889 // FIXME: It would be nicer if the keyword was ignored only for this 890 // declarator. Otherwise we could get follow-up errors. 891 D.getMutableDeclSpec().ClearStorageClassSpecs(); 892 } 893 break; 894 default: 895 if (DS.getStorageClassSpecLoc().isValid()) 896 Diag(DS.getStorageClassSpecLoc(), 897 diag::err_storageclass_invalid_for_member); 898 else 899 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 900 D.getMutableDeclSpec().ClearStorageClassSpecs(); 901 } 902 903 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 904 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 905 !isFunc); 906 907 Decl *Member; 908 if (isInstField) { 909 CXXScopeSpec &SS = D.getCXXScopeSpec(); 910 911 912 if (SS.isSet() && !SS.isInvalid()) { 913 // The user provided a superfluous scope specifier inside a class 914 // definition: 915 // 916 // class X { 917 // int X::member; 918 // }; 919 DeclContext *DC = 0; 920 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 921 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 922 << Name << FixItHint::CreateRemoval(SS.getRange()); 923 else 924 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 925 << Name << SS.getRange(); 926 927 SS.clear(); 928 } 929 930 // FIXME: Check for template parameters! 931 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 932 AS); 933 assert(Member && "HandleField never returns null"); 934 } else { 935 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 936 if (!Member) { 937 return 0; 938 } 939 940 // Non-instance-fields can't have a bitfield. 941 if (BitWidth) { 942 if (Member->isInvalidDecl()) { 943 // don't emit another diagnostic. 944 } else if (isa<VarDecl>(Member)) { 945 // C++ 9.6p3: A bit-field shall not be a static member. 946 // "static member 'A' cannot be a bit-field" 947 Diag(Loc, diag::err_static_not_bitfield) 948 << Name << BitWidth->getSourceRange(); 949 } else if (isa<TypedefDecl>(Member)) { 950 // "typedef member 'x' cannot be a bit-field" 951 Diag(Loc, diag::err_typedef_not_bitfield) 952 << Name << BitWidth->getSourceRange(); 953 } else { 954 // A function typedef ("typedef int f(); f a;"). 955 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 956 Diag(Loc, diag::err_not_integral_type_bitfield) 957 << Name << cast<ValueDecl>(Member)->getType() 958 << BitWidth->getSourceRange(); 959 } 960 961 BitWidth = 0; 962 Member->setInvalidDecl(); 963 } 964 965 Member->setAccess(AS); 966 967 // If we have declared a member function template, set the access of the 968 // templated declaration as well. 969 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 970 FunTmpl->getTemplatedDecl()->setAccess(AS); 971 } 972 973 assert((Name || isInstField) && "No identifier for non-field ?"); 974 975 if (Init) 976 AddInitializerToDecl(Member, Init, false); 977 if (Deleted) // FIXME: Source location is not very good. 978 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 979 980 if (isInstField) { 981 FieldCollector->Add(cast<FieldDecl>(Member)); 982 return 0; 983 } 984 return Member; 985} 986 987/// \brief Find the direct and/or virtual base specifiers that 988/// correspond to the given base type, for use in base initialization 989/// within a constructor. 990static bool FindBaseInitializer(Sema &SemaRef, 991 CXXRecordDecl *ClassDecl, 992 QualType BaseType, 993 const CXXBaseSpecifier *&DirectBaseSpec, 994 const CXXBaseSpecifier *&VirtualBaseSpec) { 995 // First, check for a direct base class. 996 DirectBaseSpec = 0; 997 for (CXXRecordDecl::base_class_const_iterator Base 998 = ClassDecl->bases_begin(); 999 Base != ClassDecl->bases_end(); ++Base) { 1000 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1001 // We found a direct base of this type. That's what we're 1002 // initializing. 1003 DirectBaseSpec = &*Base; 1004 break; 1005 } 1006 } 1007 1008 // Check for a virtual base class. 1009 // FIXME: We might be able to short-circuit this if we know in advance that 1010 // there are no virtual bases. 1011 VirtualBaseSpec = 0; 1012 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1013 // We haven't found a base yet; search the class hierarchy for a 1014 // virtual base class. 1015 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1016 /*DetectVirtual=*/false); 1017 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1018 BaseType, Paths)) { 1019 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1020 Path != Paths.end(); ++Path) { 1021 if (Path->back().Base->isVirtual()) { 1022 VirtualBaseSpec = Path->back().Base; 1023 break; 1024 } 1025 } 1026 } 1027 } 1028 1029 return DirectBaseSpec || VirtualBaseSpec; 1030} 1031 1032/// ActOnMemInitializer - Handle a C++ member initializer. 1033MemInitResult 1034Sema::ActOnMemInitializer(Decl *ConstructorD, 1035 Scope *S, 1036 CXXScopeSpec &SS, 1037 IdentifierInfo *MemberOrBase, 1038 ParsedType TemplateTypeTy, 1039 SourceLocation IdLoc, 1040 SourceLocation LParenLoc, 1041 ExprTy **Args, unsigned NumArgs, 1042 SourceLocation RParenLoc) { 1043 if (!ConstructorD) 1044 return true; 1045 1046 AdjustDeclIfTemplate(ConstructorD); 1047 1048 CXXConstructorDecl *Constructor 1049 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1050 if (!Constructor) { 1051 // The user wrote a constructor initializer on a function that is 1052 // not a C++ constructor. Ignore the error for now, because we may 1053 // have more member initializers coming; we'll diagnose it just 1054 // once in ActOnMemInitializers. 1055 return true; 1056 } 1057 1058 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1059 1060 // C++ [class.base.init]p2: 1061 // Names in a mem-initializer-id are looked up in the scope of the 1062 // constructor's class and, if not found in that scope, are looked 1063 // up in the scope containing the constructor's definition. 1064 // [Note: if the constructor's class contains a member with the 1065 // same name as a direct or virtual base class of the class, a 1066 // mem-initializer-id naming the member or base class and composed 1067 // of a single identifier refers to the class member. A 1068 // mem-initializer-id for the hidden base class may be specified 1069 // using a qualified name. ] 1070 if (!SS.getScopeRep() && !TemplateTypeTy) { 1071 // Look for a member, first. 1072 FieldDecl *Member = 0; 1073 DeclContext::lookup_result Result 1074 = ClassDecl->lookup(MemberOrBase); 1075 if (Result.first != Result.second) { 1076 Member = dyn_cast<FieldDecl>(*Result.first); 1077 1078 if (Member) 1079 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1080 LParenLoc, RParenLoc); 1081 // Handle anonymous union case. 1082 if (IndirectFieldDecl* IndirectField 1083 = dyn_cast<IndirectFieldDecl>(*Result.first)) 1084 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1085 NumArgs, IdLoc, 1086 LParenLoc, RParenLoc); 1087 } 1088 } 1089 // It didn't name a member, so see if it names a class. 1090 QualType BaseType; 1091 TypeSourceInfo *TInfo = 0; 1092 1093 if (TemplateTypeTy) { 1094 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1095 } else { 1096 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1097 LookupParsedName(R, S, &SS); 1098 1099 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1100 if (!TyD) { 1101 if (R.isAmbiguous()) return true; 1102 1103 // We don't want access-control diagnostics here. 1104 R.suppressDiagnostics(); 1105 1106 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1107 bool NotUnknownSpecialization = false; 1108 DeclContext *DC = computeDeclContext(SS, false); 1109 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1110 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1111 1112 if (!NotUnknownSpecialization) { 1113 // When the scope specifier can refer to a member of an unknown 1114 // specialization, we take it as a type name. 1115 BaseType = CheckTypenameType(ETK_None, 1116 (NestedNameSpecifier *)SS.getScopeRep(), 1117 *MemberOrBase, SourceLocation(), 1118 SS.getRange(), IdLoc); 1119 if (BaseType.isNull()) 1120 return true; 1121 1122 R.clear(); 1123 R.setLookupName(MemberOrBase); 1124 } 1125 } 1126 1127 // If no results were found, try to correct typos. 1128 if (R.empty() && BaseType.isNull() && 1129 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1130 R.isSingleResult()) { 1131 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1132 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1133 // We have found a non-static data member with a similar 1134 // name to what was typed; complain and initialize that 1135 // member. 1136 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1137 << MemberOrBase << true << R.getLookupName() 1138 << FixItHint::CreateReplacement(R.getNameLoc(), 1139 R.getLookupName().getAsString()); 1140 Diag(Member->getLocation(), diag::note_previous_decl) 1141 << Member->getDeclName(); 1142 1143 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1144 LParenLoc, RParenLoc); 1145 } 1146 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1147 const CXXBaseSpecifier *DirectBaseSpec; 1148 const CXXBaseSpecifier *VirtualBaseSpec; 1149 if (FindBaseInitializer(*this, ClassDecl, 1150 Context.getTypeDeclType(Type), 1151 DirectBaseSpec, VirtualBaseSpec)) { 1152 // We have found a direct or virtual base class with a 1153 // similar name to what was typed; complain and initialize 1154 // that base class. 1155 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1156 << MemberOrBase << false << R.getLookupName() 1157 << FixItHint::CreateReplacement(R.getNameLoc(), 1158 R.getLookupName().getAsString()); 1159 1160 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1161 : VirtualBaseSpec; 1162 Diag(BaseSpec->getSourceRange().getBegin(), 1163 diag::note_base_class_specified_here) 1164 << BaseSpec->getType() 1165 << BaseSpec->getSourceRange(); 1166 1167 TyD = Type; 1168 } 1169 } 1170 } 1171 1172 if (!TyD && BaseType.isNull()) { 1173 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1174 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1175 return true; 1176 } 1177 } 1178 1179 if (BaseType.isNull()) { 1180 BaseType = Context.getTypeDeclType(TyD); 1181 if (SS.isSet()) { 1182 NestedNameSpecifier *Qualifier = 1183 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1184 1185 // FIXME: preserve source range information 1186 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1187 } 1188 } 1189 } 1190 1191 if (!TInfo) 1192 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1193 1194 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1195 LParenLoc, RParenLoc, ClassDecl); 1196} 1197 1198/// Checks an initializer expression for use of uninitialized fields, such as 1199/// containing the field that is being initialized. Returns true if there is an 1200/// uninitialized field was used an updates the SourceLocation parameter; false 1201/// otherwise. 1202static bool InitExprContainsUninitializedFields(const Stmt *S, 1203 const ValueDecl *LhsField, 1204 SourceLocation *L) { 1205 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1206 1207 if (isa<CallExpr>(S)) { 1208 // Do not descend into function calls or constructors, as the use 1209 // of an uninitialized field may be valid. One would have to inspect 1210 // the contents of the function/ctor to determine if it is safe or not. 1211 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1212 // may be safe, depending on what the function/ctor does. 1213 return false; 1214 } 1215 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1216 const NamedDecl *RhsField = ME->getMemberDecl(); 1217 1218 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1219 // The member expression points to a static data member. 1220 assert(VD->isStaticDataMember() && 1221 "Member points to non-static data member!"); 1222 (void)VD; 1223 return false; 1224 } 1225 1226 if (isa<EnumConstantDecl>(RhsField)) { 1227 // The member expression points to an enum. 1228 return false; 1229 } 1230 1231 if (RhsField == LhsField) { 1232 // Initializing a field with itself. Throw a warning. 1233 // But wait; there are exceptions! 1234 // Exception #1: The field may not belong to this record. 1235 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1236 const Expr *base = ME->getBase(); 1237 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1238 // Even though the field matches, it does not belong to this record. 1239 return false; 1240 } 1241 // None of the exceptions triggered; return true to indicate an 1242 // uninitialized field was used. 1243 *L = ME->getMemberLoc(); 1244 return true; 1245 } 1246 } else if (isa<SizeOfAlignOfExpr>(S)) { 1247 // sizeof/alignof doesn't reference contents, do not warn. 1248 return false; 1249 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1250 // address-of doesn't reference contents (the pointer may be dereferenced 1251 // in the same expression but it would be rare; and weird). 1252 if (UOE->getOpcode() == UO_AddrOf) 1253 return false; 1254 } 1255 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1256 it != e; ++it) { 1257 if (!*it) { 1258 // An expression such as 'member(arg ?: "")' may trigger this. 1259 continue; 1260 } 1261 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1262 return true; 1263 } 1264 return false; 1265} 1266 1267MemInitResult 1268Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1269 unsigned NumArgs, SourceLocation IdLoc, 1270 SourceLocation LParenLoc, 1271 SourceLocation RParenLoc) { 1272 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1273 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1274 assert((DirectMember || IndirectMember) && 1275 "Member must be a FieldDecl or IndirectFieldDecl"); 1276 1277 if (Member->isInvalidDecl()) 1278 return true; 1279 1280 // Diagnose value-uses of fields to initialize themselves, e.g. 1281 // foo(foo) 1282 // where foo is not also a parameter to the constructor. 1283 // TODO: implement -Wuninitialized and fold this into that framework. 1284 for (unsigned i = 0; i < NumArgs; ++i) { 1285 SourceLocation L; 1286 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1287 // FIXME: Return true in the case when other fields are used before being 1288 // uninitialized. For example, let this field be the i'th field. When 1289 // initializing the i'th field, throw a warning if any of the >= i'th 1290 // fields are used, as they are not yet initialized. 1291 // Right now we are only handling the case where the i'th field uses 1292 // itself in its initializer. 1293 Diag(L, diag::warn_field_is_uninit); 1294 } 1295 } 1296 1297 bool HasDependentArg = false; 1298 for (unsigned i = 0; i < NumArgs; i++) 1299 HasDependentArg |= Args[i]->isTypeDependent(); 1300 1301 Expr *Init; 1302 if (Member->getType()->isDependentType() || HasDependentArg) { 1303 // Can't check initialization for a member of dependent type or when 1304 // any of the arguments are type-dependent expressions. 1305 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1306 RParenLoc); 1307 1308 // Erase any temporaries within this evaluation context; we're not 1309 // going to track them in the AST, since we'll be rebuilding the 1310 // ASTs during template instantiation. 1311 ExprTemporaries.erase( 1312 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1313 ExprTemporaries.end()); 1314 } else { 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1318 : InitializedEntity::InitializeMember(IndirectMember, 0); 1319 InitializationKind Kind = 1320 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1321 1322 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1323 1324 ExprResult MemberInit = 1325 InitSeq.Perform(*this, MemberEntity, Kind, 1326 MultiExprArg(*this, Args, NumArgs), 0); 1327 if (MemberInit.isInvalid()) 1328 return true; 1329 1330 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1331 1332 // C++0x [class.base.init]p7: 1333 // The initialization of each base and member constitutes a 1334 // full-expression. 1335 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1336 if (MemberInit.isInvalid()) 1337 return true; 1338 1339 // If we are in a dependent context, template instantiation will 1340 // perform this type-checking again. Just save the arguments that we 1341 // received in a ParenListExpr. 1342 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1343 // of the information that we have about the member 1344 // initializer. However, deconstructing the ASTs is a dicey process, 1345 // and this approach is far more likely to get the corner cases right. 1346 if (CurContext->isDependentContext()) 1347 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1348 RParenLoc); 1349 else 1350 Init = MemberInit.get(); 1351 } 1352 1353 if (DirectMember) { 1354 return new (Context) CXXBaseOrMemberInitializer(Context, DirectMember, 1355 IdLoc, LParenLoc, Init, 1356 RParenLoc); 1357 } else { 1358 return new (Context) CXXBaseOrMemberInitializer(Context, IndirectMember, 1359 IdLoc, LParenLoc, Init, 1360 RParenLoc); 1361 } 1362} 1363 1364MemInitResult 1365Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1366 Expr **Args, unsigned NumArgs, 1367 SourceLocation LParenLoc, SourceLocation RParenLoc, 1368 CXXRecordDecl *ClassDecl) { 1369 bool HasDependentArg = false; 1370 for (unsigned i = 0; i < NumArgs; i++) 1371 HasDependentArg |= Args[i]->isTypeDependent(); 1372 1373 SourceLocation BaseLoc 1374 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1375 1376 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1377 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1378 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1379 1380 // C++ [class.base.init]p2: 1381 // [...] Unless the mem-initializer-id names a nonstatic data 1382 // member of the constructor's class or a direct or virtual base 1383 // of that class, the mem-initializer is ill-formed. A 1384 // mem-initializer-list can initialize a base class using any 1385 // name that denotes that base class type. 1386 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1387 1388 // Check for direct and virtual base classes. 1389 const CXXBaseSpecifier *DirectBaseSpec = 0; 1390 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1391 if (!Dependent) { 1392 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1393 VirtualBaseSpec); 1394 1395 // C++ [base.class.init]p2: 1396 // Unless the mem-initializer-id names a nonstatic data member of the 1397 // constructor's class or a direct or virtual base of that class, the 1398 // mem-initializer is ill-formed. 1399 if (!DirectBaseSpec && !VirtualBaseSpec) { 1400 // If the class has any dependent bases, then it's possible that 1401 // one of those types will resolve to the same type as 1402 // BaseType. Therefore, just treat this as a dependent base 1403 // class initialization. FIXME: Should we try to check the 1404 // initialization anyway? It seems odd. 1405 if (ClassDecl->hasAnyDependentBases()) 1406 Dependent = true; 1407 else 1408 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1409 << BaseType << Context.getTypeDeclType(ClassDecl) 1410 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1411 } 1412 } 1413 1414 if (Dependent) { 1415 // Can't check initialization for a base of dependent type or when 1416 // any of the arguments are type-dependent expressions. 1417 ExprResult BaseInit 1418 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc)); 1420 1421 // Erase any temporaries within this evaluation context; we're not 1422 // going to track them in the AST, since we'll be rebuilding the 1423 // ASTs during template instantiation. 1424 ExprTemporaries.erase( 1425 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1426 ExprTemporaries.end()); 1427 1428 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1429 /*IsVirtual=*/false, 1430 LParenLoc, 1431 BaseInit.takeAs<Expr>(), 1432 RParenLoc); 1433 } 1434 1435 // C++ [base.class.init]p2: 1436 // If a mem-initializer-id is ambiguous because it designates both 1437 // a direct non-virtual base class and an inherited virtual base 1438 // class, the mem-initializer is ill-formed. 1439 if (DirectBaseSpec && VirtualBaseSpec) 1440 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1441 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1442 1443 CXXBaseSpecifier *BaseSpec 1444 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1445 if (!BaseSpec) 1446 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1447 1448 // Initialize the base. 1449 InitializedEntity BaseEntity = 1450 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1451 InitializationKind Kind = 1452 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1453 1454 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1455 1456 ExprResult BaseInit = 1457 InitSeq.Perform(*this, BaseEntity, Kind, 1458 MultiExprArg(*this, Args, NumArgs), 0); 1459 if (BaseInit.isInvalid()) 1460 return true; 1461 1462 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1463 1464 // C++0x [class.base.init]p7: 1465 // The initialization of each base and member constitutes a 1466 // full-expression. 1467 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1468 if (BaseInit.isInvalid()) 1469 return true; 1470 1471 // If we are in a dependent context, template instantiation will 1472 // perform this type-checking again. Just save the arguments that we 1473 // received in a ParenListExpr. 1474 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1475 // of the information that we have about the base 1476 // initializer. However, deconstructing the ASTs is a dicey process, 1477 // and this approach is far more likely to get the corner cases right. 1478 if (CurContext->isDependentContext()) { 1479 ExprResult Init 1480 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1481 RParenLoc)); 1482 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1483 BaseSpec->isVirtual(), 1484 LParenLoc, 1485 Init.takeAs<Expr>(), 1486 RParenLoc); 1487 } 1488 1489 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1490 BaseSpec->isVirtual(), 1491 LParenLoc, 1492 BaseInit.takeAs<Expr>(), 1493 RParenLoc); 1494} 1495 1496/// ImplicitInitializerKind - How an implicit base or member initializer should 1497/// initialize its base or member. 1498enum ImplicitInitializerKind { 1499 IIK_Default, 1500 IIK_Copy, 1501 IIK_Move 1502}; 1503 1504static bool 1505BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1506 ImplicitInitializerKind ImplicitInitKind, 1507 CXXBaseSpecifier *BaseSpec, 1508 bool IsInheritedVirtualBase, 1509 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1510 InitializedEntity InitEntity 1511 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1512 IsInheritedVirtualBase); 1513 1514 ExprResult BaseInit; 1515 1516 switch (ImplicitInitKind) { 1517 case IIK_Default: { 1518 InitializationKind InitKind 1519 = InitializationKind::CreateDefault(Constructor->getLocation()); 1520 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1521 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1522 MultiExprArg(SemaRef, 0, 0)); 1523 break; 1524 } 1525 1526 case IIK_Copy: { 1527 ParmVarDecl *Param = Constructor->getParamDecl(0); 1528 QualType ParamType = Param->getType().getNonReferenceType(); 1529 1530 Expr *CopyCtorArg = 1531 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1532 Constructor->getLocation(), ParamType, 1533 VK_LValue, 0); 1534 1535 // Cast to the base class to avoid ambiguities. 1536 QualType ArgTy = 1537 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1538 ParamType.getQualifiers()); 1539 1540 CXXCastPath BasePath; 1541 BasePath.push_back(BaseSpec); 1542 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1543 CK_UncheckedDerivedToBase, 1544 VK_LValue, &BasePath); 1545 1546 InitializationKind InitKind 1547 = InitializationKind::CreateDirect(Constructor->getLocation(), 1548 SourceLocation(), SourceLocation()); 1549 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1550 &CopyCtorArg, 1); 1551 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1552 MultiExprArg(&CopyCtorArg, 1)); 1553 break; 1554 } 1555 1556 case IIK_Move: 1557 assert(false && "Unhandled initializer kind!"); 1558 } 1559 1560 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1561 if (BaseInit.isInvalid()) 1562 return true; 1563 1564 CXXBaseInit = 1565 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1566 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1567 SourceLocation()), 1568 BaseSpec->isVirtual(), 1569 SourceLocation(), 1570 BaseInit.takeAs<Expr>(), 1571 SourceLocation()); 1572 1573 return false; 1574} 1575 1576static bool 1577BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1578 ImplicitInitializerKind ImplicitInitKind, 1579 FieldDecl *Field, 1580 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1581 if (Field->isInvalidDecl()) 1582 return true; 1583 1584 SourceLocation Loc = Constructor->getLocation(); 1585 1586 if (ImplicitInitKind == IIK_Copy) { 1587 ParmVarDecl *Param = Constructor->getParamDecl(0); 1588 QualType ParamType = Param->getType().getNonReferenceType(); 1589 1590 Expr *MemberExprBase = 1591 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1592 Loc, ParamType, VK_LValue, 0); 1593 1594 // Build a reference to this field within the parameter. 1595 CXXScopeSpec SS; 1596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1597 Sema::LookupMemberName); 1598 MemberLookup.addDecl(Field, AS_public); 1599 MemberLookup.resolveKind(); 1600 ExprResult CopyCtorArg 1601 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1602 ParamType, Loc, 1603 /*IsArrow=*/false, 1604 SS, 1605 /*FirstQualifierInScope=*/0, 1606 MemberLookup, 1607 /*TemplateArgs=*/0); 1608 if (CopyCtorArg.isInvalid()) 1609 return true; 1610 1611 // When the field we are copying is an array, create index variables for 1612 // each dimension of the array. We use these index variables to subscript 1613 // the source array, and other clients (e.g., CodeGen) will perform the 1614 // necessary iteration with these index variables. 1615 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1616 QualType BaseType = Field->getType(); 1617 QualType SizeType = SemaRef.Context.getSizeType(); 1618 while (const ConstantArrayType *Array 1619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1620 // Create the iteration variable for this array index. 1621 IdentifierInfo *IterationVarName = 0; 1622 { 1623 llvm::SmallString<8> Str; 1624 llvm::raw_svector_ostream OS(Str); 1625 OS << "__i" << IndexVariables.size(); 1626 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1627 } 1628 VarDecl *IterationVar 1629 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1630 IterationVarName, SizeType, 1631 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1632 SC_None, SC_None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 ExprResult IterationVarRef 1637 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1638 assert(!IterationVarRef.isInvalid() && 1639 "Reference to invented variable cannot fail!"); 1640 1641 // Subscript the array with this iteration variable. 1642 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1643 Loc, 1644 IterationVarRef.take(), 1645 Loc); 1646 if (CopyCtorArg.isInvalid()) 1647 return true; 1648 1649 BaseType = Array->getElementType(); 1650 } 1651 1652 // Construct the entity that we will be initializing. For an array, this 1653 // will be first element in the array, which may require several levels 1654 // of array-subscript entities. 1655 llvm::SmallVector<InitializedEntity, 4> Entities; 1656 Entities.reserve(1 + IndexVariables.size()); 1657 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1658 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1659 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1660 0, 1661 Entities.back())); 1662 1663 // Direct-initialize to use the copy constructor. 1664 InitializationKind InitKind = 1665 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1666 1667 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1668 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1669 &CopyCtorArgE, 1); 1670 1671 ExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 MultiExprArg(&CopyCtorArgE, 1)); 1674 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1675 if (MemberInit.isInvalid()) 1676 return true; 1677 1678 CXXMemberInit 1679 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1680 MemberInit.takeAs<Expr>(), Loc, 1681 IndexVariables.data(), 1682 IndexVariables.size()); 1683 return false; 1684 } 1685 1686 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1687 1688 QualType FieldBaseElementType = 1689 SemaRef.Context.getBaseElementType(Field->getType()); 1690 1691 if (FieldBaseElementType->isRecordType()) { 1692 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1693 InitializationKind InitKind = 1694 InitializationKind::CreateDefault(Loc); 1695 1696 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1697 ExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1699 1700 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1701 if (MemberInit.isInvalid()) 1702 return true; 1703 1704 CXXMemberInit = 1705 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1706 Field, Loc, Loc, 1707 MemberInit.get(), 1708 Loc); 1709 return false; 1710 } 1711 1712 if (FieldBaseElementType->isReferenceType()) { 1713 SemaRef.Diag(Constructor->getLocation(), 1714 diag::err_uninitialized_member_in_ctor) 1715 << (int)Constructor->isImplicit() 1716 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1717 << 0 << Field->getDeclName(); 1718 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1719 return true; 1720 } 1721 1722 if (FieldBaseElementType.isConstQualified()) { 1723 SemaRef.Diag(Constructor->getLocation(), 1724 diag::err_uninitialized_member_in_ctor) 1725 << (int)Constructor->isImplicit() 1726 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1727 << 1 << Field->getDeclName(); 1728 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1729 return true; 1730 } 1731 1732 // Nothing to initialize. 1733 CXXMemberInit = 0; 1734 return false; 1735} 1736 1737namespace { 1738struct BaseAndFieldInfo { 1739 Sema &S; 1740 CXXConstructorDecl *Ctor; 1741 bool AnyErrorsInInits; 1742 ImplicitInitializerKind IIK; 1743 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1744 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1745 1746 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1747 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1748 // FIXME: Handle implicit move constructors. 1749 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1750 IIK = IIK_Copy; 1751 else 1752 IIK = IIK_Default; 1753 } 1754}; 1755} 1756 1757static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1758 FieldDecl *Top, FieldDecl *Field) { 1759 1760 // Overwhelmingly common case: we have a direct initializer for this field. 1761 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1762 Info.AllToInit.push_back(Init); 1763 return false; 1764 } 1765 1766 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1767 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1768 assert(FieldClassType && "anonymous struct/union without record type"); 1769 CXXRecordDecl *FieldClassDecl 1770 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1771 1772 // Even though union members never have non-trivial default 1773 // constructions in C++03, we still build member initializers for aggregate 1774 // record types which can be union members, and C++0x allows non-trivial 1775 // default constructors for union members, so we ensure that only one 1776 // member is initialized for these. 1777 if (FieldClassDecl->isUnion()) { 1778 // First check for an explicit initializer for one field. 1779 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1780 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1781 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1782 Info.AllToInit.push_back(Init); 1783 1784 // Once we've initialized a field of an anonymous union, the union 1785 // field in the class is also initialized, so exit immediately. 1786 return false; 1787 } else if ((*FA)->isAnonymousStructOrUnion()) { 1788 if (CollectFieldInitializer(Info, Top, *FA)) 1789 return true; 1790 } 1791 } 1792 1793 // Fallthrough and construct a default initializer for the union as 1794 // a whole, which can call its default constructor if such a thing exists 1795 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1796 // behavior going forward with C++0x, when anonymous unions there are 1797 // finalized, we should revisit this. 1798 } else { 1799 // For structs, we simply descend through to initialize all members where 1800 // necessary. 1801 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1802 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1803 if (CollectFieldInitializer(Info, Top, *FA)) 1804 return true; 1805 } 1806 } 1807 } 1808 1809 // Don't try to build an implicit initializer if there were semantic 1810 // errors in any of the initializers (and therefore we might be 1811 // missing some that the user actually wrote). 1812 if (Info.AnyErrorsInInits) 1813 return false; 1814 1815 CXXBaseOrMemberInitializer *Init = 0; 1816 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1817 return true; 1818 1819 if (Init) 1820 Info.AllToInit.push_back(Init); 1821 1822 return false; 1823} 1824 1825bool 1826Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1827 CXXBaseOrMemberInitializer **Initializers, 1828 unsigned NumInitializers, 1829 bool AnyErrors) { 1830 if (Constructor->getDeclContext()->isDependentContext()) { 1831 // Just store the initializers as written, they will be checked during 1832 // instantiation. 1833 if (NumInitializers > 0) { 1834 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1835 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1836 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1837 memcpy(baseOrMemberInitializers, Initializers, 1838 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1839 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1840 } 1841 1842 return false; 1843 } 1844 1845 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1846 1847 // We need to build the initializer AST according to order of construction 1848 // and not what user specified in the Initializers list. 1849 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1850 if (!ClassDecl) 1851 return true; 1852 1853 bool HadError = false; 1854 1855 for (unsigned i = 0; i < NumInitializers; i++) { 1856 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1857 1858 if (Member->isBaseInitializer()) 1859 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1860 else 1861 Info.AllBaseFields[Member->getAnyMember()] = Member; 1862 } 1863 1864 // Keep track of the direct virtual bases. 1865 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1866 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1867 E = ClassDecl->bases_end(); I != E; ++I) { 1868 if (I->isVirtual()) 1869 DirectVBases.insert(I); 1870 } 1871 1872 // Push virtual bases before others. 1873 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1874 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1875 1876 if (CXXBaseOrMemberInitializer *Value 1877 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1878 Info.AllToInit.push_back(Value); 1879 } else if (!AnyErrors) { 1880 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1881 CXXBaseOrMemberInitializer *CXXBaseInit; 1882 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1883 VBase, IsInheritedVirtualBase, 1884 CXXBaseInit)) { 1885 HadError = true; 1886 continue; 1887 } 1888 1889 Info.AllToInit.push_back(CXXBaseInit); 1890 } 1891 } 1892 1893 // Non-virtual bases. 1894 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1895 E = ClassDecl->bases_end(); Base != E; ++Base) { 1896 // Virtuals are in the virtual base list and already constructed. 1897 if (Base->isVirtual()) 1898 continue; 1899 1900 if (CXXBaseOrMemberInitializer *Value 1901 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1902 Info.AllToInit.push_back(Value); 1903 } else if (!AnyErrors) { 1904 CXXBaseOrMemberInitializer *CXXBaseInit; 1905 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1906 Base, /*IsInheritedVirtualBase=*/false, 1907 CXXBaseInit)) { 1908 HadError = true; 1909 continue; 1910 } 1911 1912 Info.AllToInit.push_back(CXXBaseInit); 1913 } 1914 } 1915 1916 // Fields. 1917 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1918 E = ClassDecl->field_end(); Field != E; ++Field) { 1919 if ((*Field)->getType()->isIncompleteArrayType()) { 1920 assert(ClassDecl->hasFlexibleArrayMember() && 1921 "Incomplete array type is not valid"); 1922 continue; 1923 } 1924 if (CollectFieldInitializer(Info, *Field, *Field)) 1925 HadError = true; 1926 } 1927 1928 NumInitializers = Info.AllToInit.size(); 1929 if (NumInitializers > 0) { 1930 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1931 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1932 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1933 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1934 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1935 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1936 1937 // Constructors implicitly reference the base and member 1938 // destructors. 1939 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1940 Constructor->getParent()); 1941 } 1942 1943 return HadError; 1944} 1945 1946static void *GetKeyForTopLevelField(FieldDecl *Field) { 1947 // For anonymous unions, use the class declaration as the key. 1948 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1949 if (RT->getDecl()->isAnonymousStructOrUnion()) 1950 return static_cast<void *>(RT->getDecl()); 1951 } 1952 return static_cast<void *>(Field); 1953} 1954 1955static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1956 return Context.getCanonicalType(BaseType).getTypePtr(); 1957} 1958 1959static void *GetKeyForMember(ASTContext &Context, 1960 CXXBaseOrMemberInitializer *Member) { 1961 if (!Member->isAnyMemberInitializer()) 1962 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1963 1964 // For fields injected into the class via declaration of an anonymous union, 1965 // use its anonymous union class declaration as the unique key. 1966 FieldDecl *Field = Member->getAnyMember(); 1967 1968 // If the field is a member of an anonymous struct or union, our key 1969 // is the anonymous record decl that's a direct child of the class. 1970 RecordDecl *RD = Field->getParent(); 1971 if (RD->isAnonymousStructOrUnion()) { 1972 while (true) { 1973 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1974 if (Parent->isAnonymousStructOrUnion()) 1975 RD = Parent; 1976 else 1977 break; 1978 } 1979 1980 return static_cast<void *>(RD); 1981 } 1982 1983 return static_cast<void *>(Field); 1984} 1985 1986static void 1987DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1988 const CXXConstructorDecl *Constructor, 1989 CXXBaseOrMemberInitializer **Inits, 1990 unsigned NumInits) { 1991 if (Constructor->getDeclContext()->isDependentContext()) 1992 return; 1993 1994 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1995 == Diagnostic::Ignored) 1996 return; 1997 1998 // Build the list of bases and members in the order that they'll 1999 // actually be initialized. The explicit initializers should be in 2000 // this same order but may be missing things. 2001 llvm::SmallVector<const void*, 32> IdealInitKeys; 2002 2003 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2004 2005 // 1. Virtual bases. 2006 for (CXXRecordDecl::base_class_const_iterator VBase = 2007 ClassDecl->vbases_begin(), 2008 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2009 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2010 2011 // 2. Non-virtual bases. 2012 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2013 E = ClassDecl->bases_end(); Base != E; ++Base) { 2014 if (Base->isVirtual()) 2015 continue; 2016 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2017 } 2018 2019 // 3. Direct fields. 2020 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2021 E = ClassDecl->field_end(); Field != E; ++Field) 2022 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2023 2024 unsigned NumIdealInits = IdealInitKeys.size(); 2025 unsigned IdealIndex = 0; 2026 2027 CXXBaseOrMemberInitializer *PrevInit = 0; 2028 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2029 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2030 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2031 2032 // Scan forward to try to find this initializer in the idealized 2033 // initializers list. 2034 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2035 if (InitKey == IdealInitKeys[IdealIndex]) 2036 break; 2037 2038 // If we didn't find this initializer, it must be because we 2039 // scanned past it on a previous iteration. That can only 2040 // happen if we're out of order; emit a warning. 2041 if (IdealIndex == NumIdealInits && PrevInit) { 2042 Sema::SemaDiagnosticBuilder D = 2043 SemaRef.Diag(PrevInit->getSourceLocation(), 2044 diag::warn_initializer_out_of_order); 2045 2046 if (PrevInit->isAnyMemberInitializer()) 2047 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2048 else 2049 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2050 2051 if (Init->isAnyMemberInitializer()) 2052 D << 0 << Init->getAnyMember()->getDeclName(); 2053 else 2054 D << 1 << Init->getBaseClassInfo()->getType(); 2055 2056 // Move back to the initializer's location in the ideal list. 2057 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2058 if (InitKey == IdealInitKeys[IdealIndex]) 2059 break; 2060 2061 assert(IdealIndex != NumIdealInits && 2062 "initializer not found in initializer list"); 2063 } 2064 2065 PrevInit = Init; 2066 } 2067} 2068 2069namespace { 2070bool CheckRedundantInit(Sema &S, 2071 CXXBaseOrMemberInitializer *Init, 2072 CXXBaseOrMemberInitializer *&PrevInit) { 2073 if (!PrevInit) { 2074 PrevInit = Init; 2075 return false; 2076 } 2077 2078 if (FieldDecl *Field = Init->getMember()) 2079 S.Diag(Init->getSourceLocation(), 2080 diag::err_multiple_mem_initialization) 2081 << Field->getDeclName() 2082 << Init->getSourceRange(); 2083 else { 2084 Type *BaseClass = Init->getBaseClass(); 2085 assert(BaseClass && "neither field nor base"); 2086 S.Diag(Init->getSourceLocation(), 2087 diag::err_multiple_base_initialization) 2088 << QualType(BaseClass, 0) 2089 << Init->getSourceRange(); 2090 } 2091 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2092 << 0 << PrevInit->getSourceRange(); 2093 2094 return true; 2095} 2096 2097typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2098typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2099 2100bool CheckRedundantUnionInit(Sema &S, 2101 CXXBaseOrMemberInitializer *Init, 2102 RedundantUnionMap &Unions) { 2103 FieldDecl *Field = Init->getAnyMember(); 2104 RecordDecl *Parent = Field->getParent(); 2105 if (!Parent->isAnonymousStructOrUnion()) 2106 return false; 2107 2108 NamedDecl *Child = Field; 2109 do { 2110 if (Parent->isUnion()) { 2111 UnionEntry &En = Unions[Parent]; 2112 if (En.first && En.first != Child) { 2113 S.Diag(Init->getSourceLocation(), 2114 diag::err_multiple_mem_union_initialization) 2115 << Field->getDeclName() 2116 << Init->getSourceRange(); 2117 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2118 << 0 << En.second->getSourceRange(); 2119 return true; 2120 } else if (!En.first) { 2121 En.first = Child; 2122 En.second = Init; 2123 } 2124 } 2125 2126 Child = Parent; 2127 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2128 } while (Parent->isAnonymousStructOrUnion()); 2129 2130 return false; 2131} 2132} 2133 2134/// ActOnMemInitializers - Handle the member initializers for a constructor. 2135void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2136 SourceLocation ColonLoc, 2137 MemInitTy **meminits, unsigned NumMemInits, 2138 bool AnyErrors) { 2139 if (!ConstructorDecl) 2140 return; 2141 2142 AdjustDeclIfTemplate(ConstructorDecl); 2143 2144 CXXConstructorDecl *Constructor 2145 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2146 2147 if (!Constructor) { 2148 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2149 return; 2150 } 2151 2152 CXXBaseOrMemberInitializer **MemInits = 2153 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2154 2155 // Mapping for the duplicate initializers check. 2156 // For member initializers, this is keyed with a FieldDecl*. 2157 // For base initializers, this is keyed with a Type*. 2158 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2159 2160 // Mapping for the inconsistent anonymous-union initializers check. 2161 RedundantUnionMap MemberUnions; 2162 2163 bool HadError = false; 2164 for (unsigned i = 0; i < NumMemInits; i++) { 2165 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2166 2167 // Set the source order index. 2168 Init->setSourceOrder(i); 2169 2170 if (Init->isAnyMemberInitializer()) { 2171 FieldDecl *Field = Init->getAnyMember(); 2172 if (CheckRedundantInit(*this, Init, Members[Field]) || 2173 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2174 HadError = true; 2175 } else { 2176 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2177 if (CheckRedundantInit(*this, Init, Members[Key])) 2178 HadError = true; 2179 } 2180 } 2181 2182 if (HadError) 2183 return; 2184 2185 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2186 2187 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2188} 2189 2190void 2191Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2192 CXXRecordDecl *ClassDecl) { 2193 // Ignore dependent contexts. 2194 if (ClassDecl->isDependentContext()) 2195 return; 2196 2197 // FIXME: all the access-control diagnostics are positioned on the 2198 // field/base declaration. That's probably good; that said, the 2199 // user might reasonably want to know why the destructor is being 2200 // emitted, and we currently don't say. 2201 2202 // Non-static data members. 2203 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2204 E = ClassDecl->field_end(); I != E; ++I) { 2205 FieldDecl *Field = *I; 2206 if (Field->isInvalidDecl()) 2207 continue; 2208 QualType FieldType = Context.getBaseElementType(Field->getType()); 2209 2210 const RecordType* RT = FieldType->getAs<RecordType>(); 2211 if (!RT) 2212 continue; 2213 2214 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2215 if (FieldClassDecl->hasTrivialDestructor()) 2216 continue; 2217 2218 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2219 CheckDestructorAccess(Field->getLocation(), Dtor, 2220 PDiag(diag::err_access_dtor_field) 2221 << Field->getDeclName() 2222 << FieldType); 2223 2224 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2225 } 2226 2227 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2228 2229 // Bases. 2230 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2231 E = ClassDecl->bases_end(); Base != E; ++Base) { 2232 // Bases are always records in a well-formed non-dependent class. 2233 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2234 2235 // Remember direct virtual bases. 2236 if (Base->isVirtual()) 2237 DirectVirtualBases.insert(RT); 2238 2239 // Ignore trivial destructors. 2240 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2241 if (BaseClassDecl->hasTrivialDestructor()) 2242 continue; 2243 2244 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2245 2246 // FIXME: caret should be on the start of the class name 2247 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2248 PDiag(diag::err_access_dtor_base) 2249 << Base->getType() 2250 << Base->getSourceRange()); 2251 2252 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2253 } 2254 2255 // Virtual bases. 2256 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2257 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2258 2259 // Bases are always records in a well-formed non-dependent class. 2260 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2261 2262 // Ignore direct virtual bases. 2263 if (DirectVirtualBases.count(RT)) 2264 continue; 2265 2266 // Ignore trivial destructors. 2267 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2268 if (BaseClassDecl->hasTrivialDestructor()) 2269 continue; 2270 2271 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2272 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2273 PDiag(diag::err_access_dtor_vbase) 2274 << VBase->getType()); 2275 2276 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2277 } 2278} 2279 2280void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2281 if (!CDtorDecl) 2282 return; 2283 2284 if (CXXConstructorDecl *Constructor 2285 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2286 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2287} 2288 2289bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2290 unsigned DiagID, AbstractDiagSelID SelID) { 2291 if (SelID == -1) 2292 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2293 else 2294 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2295} 2296 2297bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2298 const PartialDiagnostic &PD) { 2299 if (!getLangOptions().CPlusPlus) 2300 return false; 2301 2302 if (const ArrayType *AT = Context.getAsArrayType(T)) 2303 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2304 2305 if (const PointerType *PT = T->getAs<PointerType>()) { 2306 // Find the innermost pointer type. 2307 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2308 PT = T; 2309 2310 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2311 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2312 } 2313 2314 const RecordType *RT = T->getAs<RecordType>(); 2315 if (!RT) 2316 return false; 2317 2318 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2319 2320 // We can't answer whether something is abstract until it has a 2321 // definition. If it's currently being defined, we'll walk back 2322 // over all the declarations when we have a full definition. 2323 const CXXRecordDecl *Def = RD->getDefinition(); 2324 if (!Def || Def->isBeingDefined()) 2325 return false; 2326 2327 if (!RD->isAbstract()) 2328 return false; 2329 2330 Diag(Loc, PD) << RD->getDeclName(); 2331 DiagnoseAbstractType(RD); 2332 2333 return true; 2334} 2335 2336void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2337 // Check if we've already emitted the list of pure virtual functions 2338 // for this class. 2339 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2340 return; 2341 2342 CXXFinalOverriderMap FinalOverriders; 2343 RD->getFinalOverriders(FinalOverriders); 2344 2345 // Keep a set of seen pure methods so we won't diagnose the same method 2346 // more than once. 2347 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2348 2349 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2350 MEnd = FinalOverriders.end(); 2351 M != MEnd; 2352 ++M) { 2353 for (OverridingMethods::iterator SO = M->second.begin(), 2354 SOEnd = M->second.end(); 2355 SO != SOEnd; ++SO) { 2356 // C++ [class.abstract]p4: 2357 // A class is abstract if it contains or inherits at least one 2358 // pure virtual function for which the final overrider is pure 2359 // virtual. 2360 2361 // 2362 if (SO->second.size() != 1) 2363 continue; 2364 2365 if (!SO->second.front().Method->isPure()) 2366 continue; 2367 2368 if (!SeenPureMethods.insert(SO->second.front().Method)) 2369 continue; 2370 2371 Diag(SO->second.front().Method->getLocation(), 2372 diag::note_pure_virtual_function) 2373 << SO->second.front().Method->getDeclName(); 2374 } 2375 } 2376 2377 if (!PureVirtualClassDiagSet) 2378 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2379 PureVirtualClassDiagSet->insert(RD); 2380} 2381 2382namespace { 2383struct AbstractUsageInfo { 2384 Sema &S; 2385 CXXRecordDecl *Record; 2386 CanQualType AbstractType; 2387 bool Invalid; 2388 2389 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2390 : S(S), Record(Record), 2391 AbstractType(S.Context.getCanonicalType( 2392 S.Context.getTypeDeclType(Record))), 2393 Invalid(false) {} 2394 2395 void DiagnoseAbstractType() { 2396 if (Invalid) return; 2397 S.DiagnoseAbstractType(Record); 2398 Invalid = true; 2399 } 2400 2401 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2402}; 2403 2404struct CheckAbstractUsage { 2405 AbstractUsageInfo &Info; 2406 const NamedDecl *Ctx; 2407 2408 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2409 : Info(Info), Ctx(Ctx) {} 2410 2411 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2412 switch (TL.getTypeLocClass()) { 2413#define ABSTRACT_TYPELOC(CLASS, PARENT) 2414#define TYPELOC(CLASS, PARENT) \ 2415 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2416#include "clang/AST/TypeLocNodes.def" 2417 } 2418 } 2419 2420 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2421 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2422 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2423 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2424 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2425 } 2426 } 2427 2428 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2429 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2430 } 2431 2432 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2433 // Visit the type parameters from a permissive context. 2434 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2435 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2436 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2437 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2438 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2439 // TODO: other template argument types? 2440 } 2441 } 2442 2443 // Visit pointee types from a permissive context. 2444#define CheckPolymorphic(Type) \ 2445 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2446 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2447 } 2448 CheckPolymorphic(PointerTypeLoc) 2449 CheckPolymorphic(ReferenceTypeLoc) 2450 CheckPolymorphic(MemberPointerTypeLoc) 2451 CheckPolymorphic(BlockPointerTypeLoc) 2452 2453 /// Handle all the types we haven't given a more specific 2454 /// implementation for above. 2455 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2456 // Every other kind of type that we haven't called out already 2457 // that has an inner type is either (1) sugar or (2) contains that 2458 // inner type in some way as a subobject. 2459 if (TypeLoc Next = TL.getNextTypeLoc()) 2460 return Visit(Next, Sel); 2461 2462 // If there's no inner type and we're in a permissive context, 2463 // don't diagnose. 2464 if (Sel == Sema::AbstractNone) return; 2465 2466 // Check whether the type matches the abstract type. 2467 QualType T = TL.getType(); 2468 if (T->isArrayType()) { 2469 Sel = Sema::AbstractArrayType; 2470 T = Info.S.Context.getBaseElementType(T); 2471 } 2472 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2473 if (CT != Info.AbstractType) return; 2474 2475 // It matched; do some magic. 2476 if (Sel == Sema::AbstractArrayType) { 2477 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2478 << T << TL.getSourceRange(); 2479 } else { 2480 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2481 << Sel << T << TL.getSourceRange(); 2482 } 2483 Info.DiagnoseAbstractType(); 2484 } 2485}; 2486 2487void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2488 Sema::AbstractDiagSelID Sel) { 2489 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2490} 2491 2492} 2493 2494/// Check for invalid uses of an abstract type in a method declaration. 2495static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2496 CXXMethodDecl *MD) { 2497 // No need to do the check on definitions, which require that 2498 // the return/param types be complete. 2499 if (MD->isThisDeclarationADefinition()) 2500 return; 2501 2502 // For safety's sake, just ignore it if we don't have type source 2503 // information. This should never happen for non-implicit methods, 2504 // but... 2505 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2506 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2507} 2508 2509/// Check for invalid uses of an abstract type within a class definition. 2510static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2511 CXXRecordDecl *RD) { 2512 for (CXXRecordDecl::decl_iterator 2513 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2514 Decl *D = *I; 2515 if (D->isImplicit()) continue; 2516 2517 // Methods and method templates. 2518 if (isa<CXXMethodDecl>(D)) { 2519 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2520 } else if (isa<FunctionTemplateDecl>(D)) { 2521 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2522 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2523 2524 // Fields and static variables. 2525 } else if (isa<FieldDecl>(D)) { 2526 FieldDecl *FD = cast<FieldDecl>(D); 2527 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2528 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2529 } else if (isa<VarDecl>(D)) { 2530 VarDecl *VD = cast<VarDecl>(D); 2531 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2532 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2533 2534 // Nested classes and class templates. 2535 } else if (isa<CXXRecordDecl>(D)) { 2536 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2537 } else if (isa<ClassTemplateDecl>(D)) { 2538 CheckAbstractClassUsage(Info, 2539 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2540 } 2541 } 2542} 2543 2544/// \brief Perform semantic checks on a class definition that has been 2545/// completing, introducing implicitly-declared members, checking for 2546/// abstract types, etc. 2547void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2548 if (!Record) 2549 return; 2550 2551 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2552 AbstractUsageInfo Info(*this, Record); 2553 CheckAbstractClassUsage(Info, Record); 2554 } 2555 2556 // If this is not an aggregate type and has no user-declared constructor, 2557 // complain about any non-static data members of reference or const scalar 2558 // type, since they will never get initializers. 2559 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2560 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2561 bool Complained = false; 2562 for (RecordDecl::field_iterator F = Record->field_begin(), 2563 FEnd = Record->field_end(); 2564 F != FEnd; ++F) { 2565 if (F->getType()->isReferenceType() || 2566 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2567 if (!Complained) { 2568 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2569 << Record->getTagKind() << Record; 2570 Complained = true; 2571 } 2572 2573 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2574 << F->getType()->isReferenceType() 2575 << F->getDeclName(); 2576 } 2577 } 2578 } 2579 2580 if (Record->isDynamicClass()) 2581 DynamicClasses.push_back(Record); 2582 2583 if (Record->getIdentifier()) { 2584 // C++ [class.mem]p13: 2585 // If T is the name of a class, then each of the following shall have a 2586 // name different from T: 2587 // - every member of every anonymous union that is a member of class T. 2588 // 2589 // C++ [class.mem]p14: 2590 // In addition, if class T has a user-declared constructor (12.1), every 2591 // non-static data member of class T shall have a name different from T. 2592 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2593 R.first != R.second; ++R.first) { 2594 NamedDecl *D = *R.first; 2595 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2596 isa<IndirectFieldDecl>(D)) { 2597 Diag(D->getLocation(), diag::err_member_name_of_class) 2598 << D->getDeclName(); 2599 break; 2600 } 2601 } 2602 } 2603} 2604 2605void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2606 Decl *TagDecl, 2607 SourceLocation LBrac, 2608 SourceLocation RBrac, 2609 AttributeList *AttrList) { 2610 if (!TagDecl) 2611 return; 2612 2613 AdjustDeclIfTemplate(TagDecl); 2614 2615 ActOnFields(S, RLoc, TagDecl, 2616 // strict aliasing violation! 2617 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2618 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2619 2620 CheckCompletedCXXClass( 2621 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2622} 2623 2624namespace { 2625 /// \brief Helper class that collects exception specifications for 2626 /// implicitly-declared special member functions. 2627 class ImplicitExceptionSpecification { 2628 ASTContext &Context; 2629 bool AllowsAllExceptions; 2630 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2631 llvm::SmallVector<QualType, 4> Exceptions; 2632 2633 public: 2634 explicit ImplicitExceptionSpecification(ASTContext &Context) 2635 : Context(Context), AllowsAllExceptions(false) { } 2636 2637 /// \brief Whether the special member function should have any 2638 /// exception specification at all. 2639 bool hasExceptionSpecification() const { 2640 return !AllowsAllExceptions; 2641 } 2642 2643 /// \brief Whether the special member function should have a 2644 /// throw(...) exception specification (a Microsoft extension). 2645 bool hasAnyExceptionSpecification() const { 2646 return false; 2647 } 2648 2649 /// \brief The number of exceptions in the exception specification. 2650 unsigned size() const { return Exceptions.size(); } 2651 2652 /// \brief The set of exceptions in the exception specification. 2653 const QualType *data() const { return Exceptions.data(); } 2654 2655 /// \brief Note that 2656 void CalledDecl(CXXMethodDecl *Method) { 2657 // If we already know that we allow all exceptions, do nothing. 2658 if (AllowsAllExceptions || !Method) 2659 return; 2660 2661 const FunctionProtoType *Proto 2662 = Method->getType()->getAs<FunctionProtoType>(); 2663 2664 // If this function can throw any exceptions, make a note of that. 2665 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2666 AllowsAllExceptions = true; 2667 ExceptionsSeen.clear(); 2668 Exceptions.clear(); 2669 return; 2670 } 2671 2672 // Record the exceptions in this function's exception specification. 2673 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2674 EEnd = Proto->exception_end(); 2675 E != EEnd; ++E) 2676 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2677 Exceptions.push_back(*E); 2678 } 2679 }; 2680} 2681 2682 2683/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2684/// special functions, such as the default constructor, copy 2685/// constructor, or destructor, to the given C++ class (C++ 2686/// [special]p1). This routine can only be executed just before the 2687/// definition of the class is complete. 2688void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2689 if (!ClassDecl->hasUserDeclaredConstructor()) 2690 ++ASTContext::NumImplicitDefaultConstructors; 2691 2692 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2693 ++ASTContext::NumImplicitCopyConstructors; 2694 2695 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2696 ++ASTContext::NumImplicitCopyAssignmentOperators; 2697 2698 // If we have a dynamic class, then the copy assignment operator may be 2699 // virtual, so we have to declare it immediately. This ensures that, e.g., 2700 // it shows up in the right place in the vtable and that we diagnose 2701 // problems with the implicit exception specification. 2702 if (ClassDecl->isDynamicClass()) 2703 DeclareImplicitCopyAssignment(ClassDecl); 2704 } 2705 2706 if (!ClassDecl->hasUserDeclaredDestructor()) { 2707 ++ASTContext::NumImplicitDestructors; 2708 2709 // If we have a dynamic class, then the destructor may be virtual, so we 2710 // have to declare the destructor immediately. This ensures that, e.g., it 2711 // shows up in the right place in the vtable and that we diagnose problems 2712 // with the implicit exception specification. 2713 if (ClassDecl->isDynamicClass()) 2714 DeclareImplicitDestructor(ClassDecl); 2715 } 2716} 2717 2718void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2719 if (!D) 2720 return; 2721 2722 TemplateParameterList *Params = 0; 2723 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2724 Params = Template->getTemplateParameters(); 2725 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2726 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2727 Params = PartialSpec->getTemplateParameters(); 2728 else 2729 return; 2730 2731 for (TemplateParameterList::iterator Param = Params->begin(), 2732 ParamEnd = Params->end(); 2733 Param != ParamEnd; ++Param) { 2734 NamedDecl *Named = cast<NamedDecl>(*Param); 2735 if (Named->getDeclName()) { 2736 S->AddDecl(Named); 2737 IdResolver.AddDecl(Named); 2738 } 2739 } 2740} 2741 2742void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2743 if (!RecordD) return; 2744 AdjustDeclIfTemplate(RecordD); 2745 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2746 PushDeclContext(S, Record); 2747} 2748 2749void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2750 if (!RecordD) return; 2751 PopDeclContext(); 2752} 2753 2754/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2755/// parsing a top-level (non-nested) C++ class, and we are now 2756/// parsing those parts of the given Method declaration that could 2757/// not be parsed earlier (C++ [class.mem]p2), such as default 2758/// arguments. This action should enter the scope of the given 2759/// Method declaration as if we had just parsed the qualified method 2760/// name. However, it should not bring the parameters into scope; 2761/// that will be performed by ActOnDelayedCXXMethodParameter. 2762void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2763} 2764 2765/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2766/// C++ method declaration. We're (re-)introducing the given 2767/// function parameter into scope for use in parsing later parts of 2768/// the method declaration. For example, we could see an 2769/// ActOnParamDefaultArgument event for this parameter. 2770void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2771 if (!ParamD) 2772 return; 2773 2774 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2775 2776 // If this parameter has an unparsed default argument, clear it out 2777 // to make way for the parsed default argument. 2778 if (Param->hasUnparsedDefaultArg()) 2779 Param->setDefaultArg(0); 2780 2781 S->AddDecl(Param); 2782 if (Param->getDeclName()) 2783 IdResolver.AddDecl(Param); 2784} 2785 2786/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2787/// processing the delayed method declaration for Method. The method 2788/// declaration is now considered finished. There may be a separate 2789/// ActOnStartOfFunctionDef action later (not necessarily 2790/// immediately!) for this method, if it was also defined inside the 2791/// class body. 2792void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2793 if (!MethodD) 2794 return; 2795 2796 AdjustDeclIfTemplate(MethodD); 2797 2798 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2799 2800 // Now that we have our default arguments, check the constructor 2801 // again. It could produce additional diagnostics or affect whether 2802 // the class has implicitly-declared destructors, among other 2803 // things. 2804 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2805 CheckConstructor(Constructor); 2806 2807 // Check the default arguments, which we may have added. 2808 if (!Method->isInvalidDecl()) 2809 CheckCXXDefaultArguments(Method); 2810} 2811 2812/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2813/// the well-formedness of the constructor declarator @p D with type @p 2814/// R. If there are any errors in the declarator, this routine will 2815/// emit diagnostics and set the invalid bit to true. In any case, the type 2816/// will be updated to reflect a well-formed type for the constructor and 2817/// returned. 2818QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2819 StorageClass &SC) { 2820 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2821 2822 // C++ [class.ctor]p3: 2823 // A constructor shall not be virtual (10.3) or static (9.4). A 2824 // constructor can be invoked for a const, volatile or const 2825 // volatile object. A constructor shall not be declared const, 2826 // volatile, or const volatile (9.3.2). 2827 if (isVirtual) { 2828 if (!D.isInvalidType()) 2829 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2830 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2831 << SourceRange(D.getIdentifierLoc()); 2832 D.setInvalidType(); 2833 } 2834 if (SC == SC_Static) { 2835 if (!D.isInvalidType()) 2836 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2837 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2838 << SourceRange(D.getIdentifierLoc()); 2839 D.setInvalidType(); 2840 SC = SC_None; 2841 } 2842 2843 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 2844 if (FTI.TypeQuals != 0) { 2845 if (FTI.TypeQuals & Qualifiers::Const) 2846 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2847 << "const" << SourceRange(D.getIdentifierLoc()); 2848 if (FTI.TypeQuals & Qualifiers::Volatile) 2849 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2850 << "volatile" << SourceRange(D.getIdentifierLoc()); 2851 if (FTI.TypeQuals & Qualifiers::Restrict) 2852 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2853 << "restrict" << SourceRange(D.getIdentifierLoc()); 2854 } 2855 2856 // Rebuild the function type "R" without any type qualifiers (in 2857 // case any of the errors above fired) and with "void" as the 2858 // return type, since constructors don't have return types. 2859 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2860 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2861 Proto->getNumArgs(), 2862 Proto->isVariadic(), 0, 2863 Proto->hasExceptionSpec(), 2864 Proto->hasAnyExceptionSpec(), 2865 Proto->getNumExceptions(), 2866 Proto->exception_begin(), 2867 Proto->getExtInfo()); 2868} 2869 2870/// CheckConstructor - Checks a fully-formed constructor for 2871/// well-formedness, issuing any diagnostics required. Returns true if 2872/// the constructor declarator is invalid. 2873void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2874 CXXRecordDecl *ClassDecl 2875 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2876 if (!ClassDecl) 2877 return Constructor->setInvalidDecl(); 2878 2879 // C++ [class.copy]p3: 2880 // A declaration of a constructor for a class X is ill-formed if 2881 // its first parameter is of type (optionally cv-qualified) X and 2882 // either there are no other parameters or else all other 2883 // parameters have default arguments. 2884 if (!Constructor->isInvalidDecl() && 2885 ((Constructor->getNumParams() == 1) || 2886 (Constructor->getNumParams() > 1 && 2887 Constructor->getParamDecl(1)->hasDefaultArg())) && 2888 Constructor->getTemplateSpecializationKind() 2889 != TSK_ImplicitInstantiation) { 2890 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2891 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2892 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2893 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2894 const char *ConstRef 2895 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2896 : " const &"; 2897 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2898 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2899 2900 // FIXME: Rather that making the constructor invalid, we should endeavor 2901 // to fix the type. 2902 Constructor->setInvalidDecl(); 2903 } 2904 } 2905} 2906 2907/// CheckDestructor - Checks a fully-formed destructor definition for 2908/// well-formedness, issuing any diagnostics required. Returns true 2909/// on error. 2910bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2911 CXXRecordDecl *RD = Destructor->getParent(); 2912 2913 if (Destructor->isVirtual()) { 2914 SourceLocation Loc; 2915 2916 if (!Destructor->isImplicit()) 2917 Loc = Destructor->getLocation(); 2918 else 2919 Loc = RD->getLocation(); 2920 2921 // If we have a virtual destructor, look up the deallocation function 2922 FunctionDecl *OperatorDelete = 0; 2923 DeclarationName Name = 2924 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2925 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2926 return true; 2927 2928 MarkDeclarationReferenced(Loc, OperatorDelete); 2929 2930 Destructor->setOperatorDelete(OperatorDelete); 2931 } 2932 2933 return false; 2934} 2935 2936static inline bool 2937FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2938 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2939 FTI.ArgInfo[0].Param && 2940 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 2941} 2942 2943/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2944/// the well-formednes of the destructor declarator @p D with type @p 2945/// R. If there are any errors in the declarator, this routine will 2946/// emit diagnostics and set the declarator to invalid. Even if this happens, 2947/// will be updated to reflect a well-formed type for the destructor and 2948/// returned. 2949QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2950 StorageClass& SC) { 2951 // C++ [class.dtor]p1: 2952 // [...] A typedef-name that names a class is a class-name 2953 // (7.1.3); however, a typedef-name that names a class shall not 2954 // be used as the identifier in the declarator for a destructor 2955 // declaration. 2956 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2957 if (isa<TypedefType>(DeclaratorType)) 2958 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2959 << DeclaratorType; 2960 2961 // C++ [class.dtor]p2: 2962 // A destructor is used to destroy objects of its class type. A 2963 // destructor takes no parameters, and no return type can be 2964 // specified for it (not even void). The address of a destructor 2965 // shall not be taken. A destructor shall not be static. A 2966 // destructor can be invoked for a const, volatile or const 2967 // volatile object. A destructor shall not be declared const, 2968 // volatile or const volatile (9.3.2). 2969 if (SC == SC_Static) { 2970 if (!D.isInvalidType()) 2971 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2972 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2973 << SourceRange(D.getIdentifierLoc()) 2974 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2975 2976 SC = SC_None; 2977 } 2978 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2979 // Destructors don't have return types, but the parser will 2980 // happily parse something like: 2981 // 2982 // class X { 2983 // float ~X(); 2984 // }; 2985 // 2986 // The return type will be eliminated later. 2987 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2988 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2989 << SourceRange(D.getIdentifierLoc()); 2990 } 2991 2992 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 2993 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2994 if (FTI.TypeQuals & Qualifiers::Const) 2995 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2996 << "const" << SourceRange(D.getIdentifierLoc()); 2997 if (FTI.TypeQuals & Qualifiers::Volatile) 2998 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2999 << "volatile" << SourceRange(D.getIdentifierLoc()); 3000 if (FTI.TypeQuals & Qualifiers::Restrict) 3001 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3002 << "restrict" << SourceRange(D.getIdentifierLoc()); 3003 D.setInvalidType(); 3004 } 3005 3006 // Make sure we don't have any parameters. 3007 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3008 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3009 3010 // Delete the parameters. 3011 FTI.freeArgs(); 3012 D.setInvalidType(); 3013 } 3014 3015 // Make sure the destructor isn't variadic. 3016 if (FTI.isVariadic) { 3017 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3018 D.setInvalidType(); 3019 } 3020 3021 // Rebuild the function type "R" without any type qualifiers or 3022 // parameters (in case any of the errors above fired) and with 3023 // "void" as the return type, since destructors don't have return 3024 // types. 3025 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3026 if (!Proto) 3027 return QualType(); 3028 3029 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3030 Proto->hasExceptionSpec(), 3031 Proto->hasAnyExceptionSpec(), 3032 Proto->getNumExceptions(), 3033 Proto->exception_begin(), 3034 Proto->getExtInfo()); 3035} 3036 3037/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3038/// well-formednes of the conversion function declarator @p D with 3039/// type @p R. If there are any errors in the declarator, this routine 3040/// will emit diagnostics and return true. Otherwise, it will return 3041/// false. Either way, the type @p R will be updated to reflect a 3042/// well-formed type for the conversion operator. 3043void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3044 StorageClass& SC) { 3045 // C++ [class.conv.fct]p1: 3046 // Neither parameter types nor return type can be specified. The 3047 // type of a conversion function (8.3.5) is "function taking no 3048 // parameter returning conversion-type-id." 3049 if (SC == SC_Static) { 3050 if (!D.isInvalidType()) 3051 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3052 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3053 << SourceRange(D.getIdentifierLoc()); 3054 D.setInvalidType(); 3055 SC = SC_None; 3056 } 3057 3058 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3059 3060 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3061 // Conversion functions don't have return types, but the parser will 3062 // happily parse something like: 3063 // 3064 // class X { 3065 // float operator bool(); 3066 // }; 3067 // 3068 // The return type will be changed later anyway. 3069 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3070 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3071 << SourceRange(D.getIdentifierLoc()); 3072 D.setInvalidType(); 3073 } 3074 3075 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3076 3077 // Make sure we don't have any parameters. 3078 if (Proto->getNumArgs() > 0) { 3079 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3080 3081 // Delete the parameters. 3082 D.getFunctionTypeInfo().freeArgs(); 3083 D.setInvalidType(); 3084 } else if (Proto->isVariadic()) { 3085 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3086 D.setInvalidType(); 3087 } 3088 3089 // Diagnose "&operator bool()" and other such nonsense. This 3090 // is actually a gcc extension which we don't support. 3091 if (Proto->getResultType() != ConvType) { 3092 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3093 << Proto->getResultType(); 3094 D.setInvalidType(); 3095 ConvType = Proto->getResultType(); 3096 } 3097 3098 // C++ [class.conv.fct]p4: 3099 // The conversion-type-id shall not represent a function type nor 3100 // an array type. 3101 if (ConvType->isArrayType()) { 3102 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3103 ConvType = Context.getPointerType(ConvType); 3104 D.setInvalidType(); 3105 } else if (ConvType->isFunctionType()) { 3106 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3107 ConvType = Context.getPointerType(ConvType); 3108 D.setInvalidType(); 3109 } 3110 3111 // Rebuild the function type "R" without any parameters (in case any 3112 // of the errors above fired) and with the conversion type as the 3113 // return type. 3114 if (D.isInvalidType()) { 3115 R = Context.getFunctionType(ConvType, 0, 0, false, 3116 Proto->getTypeQuals(), 3117 Proto->hasExceptionSpec(), 3118 Proto->hasAnyExceptionSpec(), 3119 Proto->getNumExceptions(), 3120 Proto->exception_begin(), 3121 Proto->getExtInfo()); 3122 } 3123 3124 // C++0x explicit conversion operators. 3125 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3126 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3127 diag::warn_explicit_conversion_functions) 3128 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3129} 3130 3131/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3132/// the declaration of the given C++ conversion function. This routine 3133/// is responsible for recording the conversion function in the C++ 3134/// class, if possible. 3135Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3136 assert(Conversion && "Expected to receive a conversion function declaration"); 3137 3138 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3139 3140 // Make sure we aren't redeclaring the conversion function. 3141 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3142 3143 // C++ [class.conv.fct]p1: 3144 // [...] A conversion function is never used to convert a 3145 // (possibly cv-qualified) object to the (possibly cv-qualified) 3146 // same object type (or a reference to it), to a (possibly 3147 // cv-qualified) base class of that type (or a reference to it), 3148 // or to (possibly cv-qualified) void. 3149 // FIXME: Suppress this warning if the conversion function ends up being a 3150 // virtual function that overrides a virtual function in a base class. 3151 QualType ClassType 3152 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3153 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3154 ConvType = ConvTypeRef->getPointeeType(); 3155 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3156 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3157 /* Suppress diagnostics for instantiations. */; 3158 else if (ConvType->isRecordType()) { 3159 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3160 if (ConvType == ClassType) 3161 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3162 << ClassType; 3163 else if (IsDerivedFrom(ClassType, ConvType)) 3164 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3165 << ClassType << ConvType; 3166 } else if (ConvType->isVoidType()) { 3167 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3168 << ClassType << ConvType; 3169 } 3170 3171 if (FunctionTemplateDecl *ConversionTemplate 3172 = Conversion->getDescribedFunctionTemplate()) 3173 return ConversionTemplate; 3174 3175 return Conversion; 3176} 3177 3178//===----------------------------------------------------------------------===// 3179// Namespace Handling 3180//===----------------------------------------------------------------------===// 3181 3182 3183 3184/// ActOnStartNamespaceDef - This is called at the start of a namespace 3185/// definition. 3186Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3187 SourceLocation InlineLoc, 3188 SourceLocation IdentLoc, 3189 IdentifierInfo *II, 3190 SourceLocation LBrace, 3191 AttributeList *AttrList) { 3192 // anonymous namespace starts at its left brace 3193 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3194 (II ? IdentLoc : LBrace) , II); 3195 Namespc->setLBracLoc(LBrace); 3196 Namespc->setInline(InlineLoc.isValid()); 3197 3198 Scope *DeclRegionScope = NamespcScope->getParent(); 3199 3200 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3201 3202 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3203 PushNamespaceVisibilityAttr(Attr); 3204 3205 if (II) { 3206 // C++ [namespace.def]p2: 3207 // The identifier in an original-namespace-definition shall not 3208 // have been previously defined in the declarative region in 3209 // which the original-namespace-definition appears. The 3210 // identifier in an original-namespace-definition is the name of 3211 // the namespace. Subsequently in that declarative region, it is 3212 // treated as an original-namespace-name. 3213 // 3214 // Since namespace names are unique in their scope, and we don't 3215 // look through using directives, just 3216 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3217 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3218 3219 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3220 // This is an extended namespace definition. 3221 if (Namespc->isInline() != OrigNS->isInline()) { 3222 // inline-ness must match 3223 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3224 << Namespc->isInline(); 3225 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3226 Namespc->setInvalidDecl(); 3227 // Recover by ignoring the new namespace's inline status. 3228 Namespc->setInline(OrigNS->isInline()); 3229 } 3230 3231 // Attach this namespace decl to the chain of extended namespace 3232 // definitions. 3233 OrigNS->setNextNamespace(Namespc); 3234 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3235 3236 // Remove the previous declaration from the scope. 3237 if (DeclRegionScope->isDeclScope(OrigNS)) { 3238 IdResolver.RemoveDecl(OrigNS); 3239 DeclRegionScope->RemoveDecl(OrigNS); 3240 } 3241 } else if (PrevDecl) { 3242 // This is an invalid name redefinition. 3243 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3244 << Namespc->getDeclName(); 3245 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3246 Namespc->setInvalidDecl(); 3247 // Continue on to push Namespc as current DeclContext and return it. 3248 } else if (II->isStr("std") && 3249 CurContext->getRedeclContext()->isTranslationUnit()) { 3250 // This is the first "real" definition of the namespace "std", so update 3251 // our cache of the "std" namespace to point at this definition. 3252 if (NamespaceDecl *StdNS = getStdNamespace()) { 3253 // We had already defined a dummy namespace "std". Link this new 3254 // namespace definition to the dummy namespace "std". 3255 StdNS->setNextNamespace(Namespc); 3256 StdNS->setLocation(IdentLoc); 3257 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3258 } 3259 3260 // Make our StdNamespace cache point at the first real definition of the 3261 // "std" namespace. 3262 StdNamespace = Namespc; 3263 } 3264 3265 PushOnScopeChains(Namespc, DeclRegionScope); 3266 } else { 3267 // Anonymous namespaces. 3268 assert(Namespc->isAnonymousNamespace()); 3269 3270 // Link the anonymous namespace into its parent. 3271 NamespaceDecl *PrevDecl; 3272 DeclContext *Parent = CurContext->getRedeclContext(); 3273 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3274 PrevDecl = TU->getAnonymousNamespace(); 3275 TU->setAnonymousNamespace(Namespc); 3276 } else { 3277 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3278 PrevDecl = ND->getAnonymousNamespace(); 3279 ND->setAnonymousNamespace(Namespc); 3280 } 3281 3282 // Link the anonymous namespace with its previous declaration. 3283 if (PrevDecl) { 3284 assert(PrevDecl->isAnonymousNamespace()); 3285 assert(!PrevDecl->getNextNamespace()); 3286 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3287 PrevDecl->setNextNamespace(Namespc); 3288 3289 if (Namespc->isInline() != PrevDecl->isInline()) { 3290 // inline-ness must match 3291 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3292 << Namespc->isInline(); 3293 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3294 Namespc->setInvalidDecl(); 3295 // Recover by ignoring the new namespace's inline status. 3296 Namespc->setInline(PrevDecl->isInline()); 3297 } 3298 } 3299 3300 CurContext->addDecl(Namespc); 3301 3302 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3303 // behaves as if it were replaced by 3304 // namespace unique { /* empty body */ } 3305 // using namespace unique; 3306 // namespace unique { namespace-body } 3307 // where all occurrences of 'unique' in a translation unit are 3308 // replaced by the same identifier and this identifier differs 3309 // from all other identifiers in the entire program. 3310 3311 // We just create the namespace with an empty name and then add an 3312 // implicit using declaration, just like the standard suggests. 3313 // 3314 // CodeGen enforces the "universally unique" aspect by giving all 3315 // declarations semantically contained within an anonymous 3316 // namespace internal linkage. 3317 3318 if (!PrevDecl) { 3319 UsingDirectiveDecl* UD 3320 = UsingDirectiveDecl::Create(Context, CurContext, 3321 /* 'using' */ LBrace, 3322 /* 'namespace' */ SourceLocation(), 3323 /* qualifier */ SourceRange(), 3324 /* NNS */ NULL, 3325 /* identifier */ SourceLocation(), 3326 Namespc, 3327 /* Ancestor */ CurContext); 3328 UD->setImplicit(); 3329 CurContext->addDecl(UD); 3330 } 3331 } 3332 3333 // Although we could have an invalid decl (i.e. the namespace name is a 3334 // redefinition), push it as current DeclContext and try to continue parsing. 3335 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3336 // for the namespace has the declarations that showed up in that particular 3337 // namespace definition. 3338 PushDeclContext(NamespcScope, Namespc); 3339 return Namespc; 3340} 3341 3342/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3343/// is a namespace alias, returns the namespace it points to. 3344static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3345 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3346 return AD->getNamespace(); 3347 return dyn_cast_or_null<NamespaceDecl>(D); 3348} 3349 3350/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3351/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3352void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3353 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3354 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3355 Namespc->setRBracLoc(RBrace); 3356 PopDeclContext(); 3357 if (Namespc->hasAttr<VisibilityAttr>()) 3358 PopPragmaVisibility(); 3359} 3360 3361CXXRecordDecl *Sema::getStdBadAlloc() const { 3362 return cast_or_null<CXXRecordDecl>( 3363 StdBadAlloc.get(Context.getExternalSource())); 3364} 3365 3366NamespaceDecl *Sema::getStdNamespace() const { 3367 return cast_or_null<NamespaceDecl>( 3368 StdNamespace.get(Context.getExternalSource())); 3369} 3370 3371/// \brief Retrieve the special "std" namespace, which may require us to 3372/// implicitly define the namespace. 3373NamespaceDecl *Sema::getOrCreateStdNamespace() { 3374 if (!StdNamespace) { 3375 // The "std" namespace has not yet been defined, so build one implicitly. 3376 StdNamespace = NamespaceDecl::Create(Context, 3377 Context.getTranslationUnitDecl(), 3378 SourceLocation(), 3379 &PP.getIdentifierTable().get("std")); 3380 getStdNamespace()->setImplicit(true); 3381 } 3382 3383 return getStdNamespace(); 3384} 3385 3386Decl *Sema::ActOnUsingDirective(Scope *S, 3387 SourceLocation UsingLoc, 3388 SourceLocation NamespcLoc, 3389 CXXScopeSpec &SS, 3390 SourceLocation IdentLoc, 3391 IdentifierInfo *NamespcName, 3392 AttributeList *AttrList) { 3393 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3394 assert(NamespcName && "Invalid NamespcName."); 3395 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3396 3397 // This can only happen along a recovery path. 3398 while (S->getFlags() & Scope::TemplateParamScope) 3399 S = S->getParent(); 3400 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3401 3402 UsingDirectiveDecl *UDir = 0; 3403 NestedNameSpecifier *Qualifier = 0; 3404 if (SS.isSet()) 3405 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3406 3407 // Lookup namespace name. 3408 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3409 LookupParsedName(R, S, &SS); 3410 if (R.isAmbiguous()) 3411 return 0; 3412 3413 if (R.empty()) { 3414 // Allow "using namespace std;" or "using namespace ::std;" even if 3415 // "std" hasn't been defined yet, for GCC compatibility. 3416 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3417 NamespcName->isStr("std")) { 3418 Diag(IdentLoc, diag::ext_using_undefined_std); 3419 R.addDecl(getOrCreateStdNamespace()); 3420 R.resolveKind(); 3421 } 3422 // Otherwise, attempt typo correction. 3423 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3424 CTC_NoKeywords, 0)) { 3425 if (R.getAsSingle<NamespaceDecl>() || 3426 R.getAsSingle<NamespaceAliasDecl>()) { 3427 if (DeclContext *DC = computeDeclContext(SS, false)) 3428 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3429 << NamespcName << DC << Corrected << SS.getRange() 3430 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3431 else 3432 Diag(IdentLoc, diag::err_using_directive_suggest) 3433 << NamespcName << Corrected 3434 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3435 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3436 << Corrected; 3437 3438 NamespcName = Corrected.getAsIdentifierInfo(); 3439 } else { 3440 R.clear(); 3441 R.setLookupName(NamespcName); 3442 } 3443 } 3444 } 3445 3446 if (!R.empty()) { 3447 NamedDecl *Named = R.getFoundDecl(); 3448 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3449 && "expected namespace decl"); 3450 // C++ [namespace.udir]p1: 3451 // A using-directive specifies that the names in the nominated 3452 // namespace can be used in the scope in which the 3453 // using-directive appears after the using-directive. During 3454 // unqualified name lookup (3.4.1), the names appear as if they 3455 // were declared in the nearest enclosing namespace which 3456 // contains both the using-directive and the nominated 3457 // namespace. [Note: in this context, "contains" means "contains 3458 // directly or indirectly". ] 3459 3460 // Find enclosing context containing both using-directive and 3461 // nominated namespace. 3462 NamespaceDecl *NS = getNamespaceDecl(Named); 3463 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3464 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3465 CommonAncestor = CommonAncestor->getParent(); 3466 3467 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3468 SS.getRange(), 3469 (NestedNameSpecifier *)SS.getScopeRep(), 3470 IdentLoc, Named, CommonAncestor); 3471 PushUsingDirective(S, UDir); 3472 } else { 3473 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3474 } 3475 3476 // FIXME: We ignore attributes for now. 3477 return UDir; 3478} 3479 3480void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3481 // If scope has associated entity, then using directive is at namespace 3482 // or translation unit scope. We add UsingDirectiveDecls, into 3483 // it's lookup structure. 3484 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3485 Ctx->addDecl(UDir); 3486 else 3487 // Otherwise it is block-sope. using-directives will affect lookup 3488 // only to the end of scope. 3489 S->PushUsingDirective(UDir); 3490} 3491 3492 3493Decl *Sema::ActOnUsingDeclaration(Scope *S, 3494 AccessSpecifier AS, 3495 bool HasUsingKeyword, 3496 SourceLocation UsingLoc, 3497 CXXScopeSpec &SS, 3498 UnqualifiedId &Name, 3499 AttributeList *AttrList, 3500 bool IsTypeName, 3501 SourceLocation TypenameLoc) { 3502 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3503 3504 switch (Name.getKind()) { 3505 case UnqualifiedId::IK_Identifier: 3506 case UnqualifiedId::IK_OperatorFunctionId: 3507 case UnqualifiedId::IK_LiteralOperatorId: 3508 case UnqualifiedId::IK_ConversionFunctionId: 3509 break; 3510 3511 case UnqualifiedId::IK_ConstructorName: 3512 case UnqualifiedId::IK_ConstructorTemplateId: 3513 // C++0x inherited constructors. 3514 if (getLangOptions().CPlusPlus0x) break; 3515 3516 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3517 << SS.getRange(); 3518 return 0; 3519 3520 case UnqualifiedId::IK_DestructorName: 3521 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3522 << SS.getRange(); 3523 return 0; 3524 3525 case UnqualifiedId::IK_TemplateId: 3526 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3527 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3528 return 0; 3529 } 3530 3531 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3532 DeclarationName TargetName = TargetNameInfo.getName(); 3533 if (!TargetName) 3534 return 0; 3535 3536 // Warn about using declarations. 3537 // TODO: store that the declaration was written without 'using' and 3538 // talk about access decls instead of using decls in the 3539 // diagnostics. 3540 if (!HasUsingKeyword) { 3541 UsingLoc = Name.getSourceRange().getBegin(); 3542 3543 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3544 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3545 } 3546 3547 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3548 TargetNameInfo, AttrList, 3549 /* IsInstantiation */ false, 3550 IsTypeName, TypenameLoc); 3551 if (UD) 3552 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3553 3554 return UD; 3555} 3556 3557/// \brief Determine whether a using declaration considers the given 3558/// declarations as "equivalent", e.g., if they are redeclarations of 3559/// the same entity or are both typedefs of the same type. 3560static bool 3561IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3562 bool &SuppressRedeclaration) { 3563 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3564 SuppressRedeclaration = false; 3565 return true; 3566 } 3567 3568 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3569 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3570 SuppressRedeclaration = true; 3571 return Context.hasSameType(TD1->getUnderlyingType(), 3572 TD2->getUnderlyingType()); 3573 } 3574 3575 return false; 3576} 3577 3578 3579/// Determines whether to create a using shadow decl for a particular 3580/// decl, given the set of decls existing prior to this using lookup. 3581bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3582 const LookupResult &Previous) { 3583 // Diagnose finding a decl which is not from a base class of the 3584 // current class. We do this now because there are cases where this 3585 // function will silently decide not to build a shadow decl, which 3586 // will pre-empt further diagnostics. 3587 // 3588 // We don't need to do this in C++0x because we do the check once on 3589 // the qualifier. 3590 // 3591 // FIXME: diagnose the following if we care enough: 3592 // struct A { int foo; }; 3593 // struct B : A { using A::foo; }; 3594 // template <class T> struct C : A {}; 3595 // template <class T> struct D : C<T> { using B::foo; } // <--- 3596 // This is invalid (during instantiation) in C++03 because B::foo 3597 // resolves to the using decl in B, which is not a base class of D<T>. 3598 // We can't diagnose it immediately because C<T> is an unknown 3599 // specialization. The UsingShadowDecl in D<T> then points directly 3600 // to A::foo, which will look well-formed when we instantiate. 3601 // The right solution is to not collapse the shadow-decl chain. 3602 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3603 DeclContext *OrigDC = Orig->getDeclContext(); 3604 3605 // Handle enums and anonymous structs. 3606 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3607 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3608 while (OrigRec->isAnonymousStructOrUnion()) 3609 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3610 3611 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3612 if (OrigDC == CurContext) { 3613 Diag(Using->getLocation(), 3614 diag::err_using_decl_nested_name_specifier_is_current_class) 3615 << Using->getNestedNameRange(); 3616 Diag(Orig->getLocation(), diag::note_using_decl_target); 3617 return true; 3618 } 3619 3620 Diag(Using->getNestedNameRange().getBegin(), 3621 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3622 << Using->getTargetNestedNameDecl() 3623 << cast<CXXRecordDecl>(CurContext) 3624 << Using->getNestedNameRange(); 3625 Diag(Orig->getLocation(), diag::note_using_decl_target); 3626 return true; 3627 } 3628 } 3629 3630 if (Previous.empty()) return false; 3631 3632 NamedDecl *Target = Orig; 3633 if (isa<UsingShadowDecl>(Target)) 3634 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3635 3636 // If the target happens to be one of the previous declarations, we 3637 // don't have a conflict. 3638 // 3639 // FIXME: but we might be increasing its access, in which case we 3640 // should redeclare it. 3641 NamedDecl *NonTag = 0, *Tag = 0; 3642 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3643 I != E; ++I) { 3644 NamedDecl *D = (*I)->getUnderlyingDecl(); 3645 bool Result; 3646 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3647 return Result; 3648 3649 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3650 } 3651 3652 if (Target->isFunctionOrFunctionTemplate()) { 3653 FunctionDecl *FD; 3654 if (isa<FunctionTemplateDecl>(Target)) 3655 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3656 else 3657 FD = cast<FunctionDecl>(Target); 3658 3659 NamedDecl *OldDecl = 0; 3660 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3661 case Ovl_Overload: 3662 return false; 3663 3664 case Ovl_NonFunction: 3665 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3666 break; 3667 3668 // We found a decl with the exact signature. 3669 case Ovl_Match: 3670 // If we're in a record, we want to hide the target, so we 3671 // return true (without a diagnostic) to tell the caller not to 3672 // build a shadow decl. 3673 if (CurContext->isRecord()) 3674 return true; 3675 3676 // If we're not in a record, this is an error. 3677 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3678 break; 3679 } 3680 3681 Diag(Target->getLocation(), diag::note_using_decl_target); 3682 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3683 return true; 3684 } 3685 3686 // Target is not a function. 3687 3688 if (isa<TagDecl>(Target)) { 3689 // No conflict between a tag and a non-tag. 3690 if (!Tag) return false; 3691 3692 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3693 Diag(Target->getLocation(), diag::note_using_decl_target); 3694 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3695 return true; 3696 } 3697 3698 // No conflict between a tag and a non-tag. 3699 if (!NonTag) return false; 3700 3701 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3702 Diag(Target->getLocation(), diag::note_using_decl_target); 3703 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3704 return true; 3705} 3706 3707/// Builds a shadow declaration corresponding to a 'using' declaration. 3708UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3709 UsingDecl *UD, 3710 NamedDecl *Orig) { 3711 3712 // If we resolved to another shadow declaration, just coalesce them. 3713 NamedDecl *Target = Orig; 3714 if (isa<UsingShadowDecl>(Target)) { 3715 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3716 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3717 } 3718 3719 UsingShadowDecl *Shadow 3720 = UsingShadowDecl::Create(Context, CurContext, 3721 UD->getLocation(), UD, Target); 3722 UD->addShadowDecl(Shadow); 3723 3724 Shadow->setAccess(UD->getAccess()); 3725 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3726 Shadow->setInvalidDecl(); 3727 3728 if (S) 3729 PushOnScopeChains(Shadow, S); 3730 else 3731 CurContext->addDecl(Shadow); 3732 3733 3734 return Shadow; 3735} 3736 3737/// Hides a using shadow declaration. This is required by the current 3738/// using-decl implementation when a resolvable using declaration in a 3739/// class is followed by a declaration which would hide or override 3740/// one or more of the using decl's targets; for example: 3741/// 3742/// struct Base { void foo(int); }; 3743/// struct Derived : Base { 3744/// using Base::foo; 3745/// void foo(int); 3746/// }; 3747/// 3748/// The governing language is C++03 [namespace.udecl]p12: 3749/// 3750/// When a using-declaration brings names from a base class into a 3751/// derived class scope, member functions in the derived class 3752/// override and/or hide member functions with the same name and 3753/// parameter types in a base class (rather than conflicting). 3754/// 3755/// There are two ways to implement this: 3756/// (1) optimistically create shadow decls when they're not hidden 3757/// by existing declarations, or 3758/// (2) don't create any shadow decls (or at least don't make them 3759/// visible) until we've fully parsed/instantiated the class. 3760/// The problem with (1) is that we might have to retroactively remove 3761/// a shadow decl, which requires several O(n) operations because the 3762/// decl structures are (very reasonably) not designed for removal. 3763/// (2) avoids this but is very fiddly and phase-dependent. 3764void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3765 if (Shadow->getDeclName().getNameKind() == 3766 DeclarationName::CXXConversionFunctionName) 3767 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3768 3769 // Remove it from the DeclContext... 3770 Shadow->getDeclContext()->removeDecl(Shadow); 3771 3772 // ...and the scope, if applicable... 3773 if (S) { 3774 S->RemoveDecl(Shadow); 3775 IdResolver.RemoveDecl(Shadow); 3776 } 3777 3778 // ...and the using decl. 3779 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3780 3781 // TODO: complain somehow if Shadow was used. It shouldn't 3782 // be possible for this to happen, because...? 3783} 3784 3785/// Builds a using declaration. 3786/// 3787/// \param IsInstantiation - Whether this call arises from an 3788/// instantiation of an unresolved using declaration. We treat 3789/// the lookup differently for these declarations. 3790NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3791 SourceLocation UsingLoc, 3792 CXXScopeSpec &SS, 3793 const DeclarationNameInfo &NameInfo, 3794 AttributeList *AttrList, 3795 bool IsInstantiation, 3796 bool IsTypeName, 3797 SourceLocation TypenameLoc) { 3798 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3799 SourceLocation IdentLoc = NameInfo.getLoc(); 3800 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3801 3802 // FIXME: We ignore attributes for now. 3803 3804 if (SS.isEmpty()) { 3805 Diag(IdentLoc, diag::err_using_requires_qualname); 3806 return 0; 3807 } 3808 3809 // Do the redeclaration lookup in the current scope. 3810 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3811 ForRedeclaration); 3812 Previous.setHideTags(false); 3813 if (S) { 3814 LookupName(Previous, S); 3815 3816 // It is really dumb that we have to do this. 3817 LookupResult::Filter F = Previous.makeFilter(); 3818 while (F.hasNext()) { 3819 NamedDecl *D = F.next(); 3820 if (!isDeclInScope(D, CurContext, S)) 3821 F.erase(); 3822 } 3823 F.done(); 3824 } else { 3825 assert(IsInstantiation && "no scope in non-instantiation"); 3826 assert(CurContext->isRecord() && "scope not record in instantiation"); 3827 LookupQualifiedName(Previous, CurContext); 3828 } 3829 3830 NestedNameSpecifier *NNS = 3831 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3832 3833 // Check for invalid redeclarations. 3834 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3835 return 0; 3836 3837 // Check for bad qualifiers. 3838 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3839 return 0; 3840 3841 DeclContext *LookupContext = computeDeclContext(SS); 3842 NamedDecl *D; 3843 if (!LookupContext) { 3844 if (IsTypeName) { 3845 // FIXME: not all declaration name kinds are legal here 3846 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3847 UsingLoc, TypenameLoc, 3848 SS.getRange(), NNS, 3849 IdentLoc, NameInfo.getName()); 3850 } else { 3851 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3852 UsingLoc, SS.getRange(), 3853 NNS, NameInfo); 3854 } 3855 } else { 3856 D = UsingDecl::Create(Context, CurContext, 3857 SS.getRange(), UsingLoc, NNS, NameInfo, 3858 IsTypeName); 3859 } 3860 D->setAccess(AS); 3861 CurContext->addDecl(D); 3862 3863 if (!LookupContext) return D; 3864 UsingDecl *UD = cast<UsingDecl>(D); 3865 3866 if (RequireCompleteDeclContext(SS, LookupContext)) { 3867 UD->setInvalidDecl(); 3868 return UD; 3869 } 3870 3871 // Look up the target name. 3872 3873 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3874 3875 // Unlike most lookups, we don't always want to hide tag 3876 // declarations: tag names are visible through the using declaration 3877 // even if hidden by ordinary names, *except* in a dependent context 3878 // where it's important for the sanity of two-phase lookup. 3879 if (!IsInstantiation) 3880 R.setHideTags(false); 3881 3882 LookupQualifiedName(R, LookupContext); 3883 3884 if (R.empty()) { 3885 Diag(IdentLoc, diag::err_no_member) 3886 << NameInfo.getName() << LookupContext << SS.getRange(); 3887 UD->setInvalidDecl(); 3888 return UD; 3889 } 3890 3891 if (R.isAmbiguous()) { 3892 UD->setInvalidDecl(); 3893 return UD; 3894 } 3895 3896 if (IsTypeName) { 3897 // If we asked for a typename and got a non-type decl, error out. 3898 if (!R.getAsSingle<TypeDecl>()) { 3899 Diag(IdentLoc, diag::err_using_typename_non_type); 3900 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3901 Diag((*I)->getUnderlyingDecl()->getLocation(), 3902 diag::note_using_decl_target); 3903 UD->setInvalidDecl(); 3904 return UD; 3905 } 3906 } else { 3907 // If we asked for a non-typename and we got a type, error out, 3908 // but only if this is an instantiation of an unresolved using 3909 // decl. Otherwise just silently find the type name. 3910 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3911 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3912 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3913 UD->setInvalidDecl(); 3914 return UD; 3915 } 3916 } 3917 3918 // C++0x N2914 [namespace.udecl]p6: 3919 // A using-declaration shall not name a namespace. 3920 if (R.getAsSingle<NamespaceDecl>()) { 3921 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3922 << SS.getRange(); 3923 UD->setInvalidDecl(); 3924 return UD; 3925 } 3926 3927 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3928 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3929 BuildUsingShadowDecl(S, UD, *I); 3930 } 3931 3932 return UD; 3933} 3934 3935/// Checks that the given using declaration is not an invalid 3936/// redeclaration. Note that this is checking only for the using decl 3937/// itself, not for any ill-formedness among the UsingShadowDecls. 3938bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3939 bool isTypeName, 3940 const CXXScopeSpec &SS, 3941 SourceLocation NameLoc, 3942 const LookupResult &Prev) { 3943 // C++03 [namespace.udecl]p8: 3944 // C++0x [namespace.udecl]p10: 3945 // A using-declaration is a declaration and can therefore be used 3946 // repeatedly where (and only where) multiple declarations are 3947 // allowed. 3948 // 3949 // That's in non-member contexts. 3950 if (!CurContext->getRedeclContext()->isRecord()) 3951 return false; 3952 3953 NestedNameSpecifier *Qual 3954 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3955 3956 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3957 NamedDecl *D = *I; 3958 3959 bool DTypename; 3960 NestedNameSpecifier *DQual; 3961 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3962 DTypename = UD->isTypeName(); 3963 DQual = UD->getTargetNestedNameDecl(); 3964 } else if (UnresolvedUsingValueDecl *UD 3965 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3966 DTypename = false; 3967 DQual = UD->getTargetNestedNameSpecifier(); 3968 } else if (UnresolvedUsingTypenameDecl *UD 3969 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3970 DTypename = true; 3971 DQual = UD->getTargetNestedNameSpecifier(); 3972 } else continue; 3973 3974 // using decls differ if one says 'typename' and the other doesn't. 3975 // FIXME: non-dependent using decls? 3976 if (isTypeName != DTypename) continue; 3977 3978 // using decls differ if they name different scopes (but note that 3979 // template instantiation can cause this check to trigger when it 3980 // didn't before instantiation). 3981 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3982 Context.getCanonicalNestedNameSpecifier(DQual)) 3983 continue; 3984 3985 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3986 Diag(D->getLocation(), diag::note_using_decl) << 1; 3987 return true; 3988 } 3989 3990 return false; 3991} 3992 3993 3994/// Checks that the given nested-name qualifier used in a using decl 3995/// in the current context is appropriately related to the current 3996/// scope. If an error is found, diagnoses it and returns true. 3997bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3998 const CXXScopeSpec &SS, 3999 SourceLocation NameLoc) { 4000 DeclContext *NamedContext = computeDeclContext(SS); 4001 4002 if (!CurContext->isRecord()) { 4003 // C++03 [namespace.udecl]p3: 4004 // C++0x [namespace.udecl]p8: 4005 // A using-declaration for a class member shall be a member-declaration. 4006 4007 // If we weren't able to compute a valid scope, it must be a 4008 // dependent class scope. 4009 if (!NamedContext || NamedContext->isRecord()) { 4010 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4011 << SS.getRange(); 4012 return true; 4013 } 4014 4015 // Otherwise, everything is known to be fine. 4016 return false; 4017 } 4018 4019 // The current scope is a record. 4020 4021 // If the named context is dependent, we can't decide much. 4022 if (!NamedContext) { 4023 // FIXME: in C++0x, we can diagnose if we can prove that the 4024 // nested-name-specifier does not refer to a base class, which is 4025 // still possible in some cases. 4026 4027 // Otherwise we have to conservatively report that things might be 4028 // okay. 4029 return false; 4030 } 4031 4032 if (!NamedContext->isRecord()) { 4033 // Ideally this would point at the last name in the specifier, 4034 // but we don't have that level of source info. 4035 Diag(SS.getRange().getBegin(), 4036 diag::err_using_decl_nested_name_specifier_is_not_class) 4037 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4038 return true; 4039 } 4040 4041 if (getLangOptions().CPlusPlus0x) { 4042 // C++0x [namespace.udecl]p3: 4043 // In a using-declaration used as a member-declaration, the 4044 // nested-name-specifier shall name a base class of the class 4045 // being defined. 4046 4047 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4048 cast<CXXRecordDecl>(NamedContext))) { 4049 if (CurContext == NamedContext) { 4050 Diag(NameLoc, 4051 diag::err_using_decl_nested_name_specifier_is_current_class) 4052 << SS.getRange(); 4053 return true; 4054 } 4055 4056 Diag(SS.getRange().getBegin(), 4057 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4058 << (NestedNameSpecifier*) SS.getScopeRep() 4059 << cast<CXXRecordDecl>(CurContext) 4060 << SS.getRange(); 4061 return true; 4062 } 4063 4064 return false; 4065 } 4066 4067 // C++03 [namespace.udecl]p4: 4068 // A using-declaration used as a member-declaration shall refer 4069 // to a member of a base class of the class being defined [etc.]. 4070 4071 // Salient point: SS doesn't have to name a base class as long as 4072 // lookup only finds members from base classes. Therefore we can 4073 // diagnose here only if we can prove that that can't happen, 4074 // i.e. if the class hierarchies provably don't intersect. 4075 4076 // TODO: it would be nice if "definitely valid" results were cached 4077 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4078 // need to be repeated. 4079 4080 struct UserData { 4081 llvm::DenseSet<const CXXRecordDecl*> Bases; 4082 4083 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4084 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4085 Data->Bases.insert(Base); 4086 return true; 4087 } 4088 4089 bool hasDependentBases(const CXXRecordDecl *Class) { 4090 return !Class->forallBases(collect, this); 4091 } 4092 4093 /// Returns true if the base is dependent or is one of the 4094 /// accumulated base classes. 4095 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4096 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4097 return !Data->Bases.count(Base); 4098 } 4099 4100 bool mightShareBases(const CXXRecordDecl *Class) { 4101 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4102 } 4103 }; 4104 4105 UserData Data; 4106 4107 // Returns false if we find a dependent base. 4108 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4109 return false; 4110 4111 // Returns false if the class has a dependent base or if it or one 4112 // of its bases is present in the base set of the current context. 4113 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4114 return false; 4115 4116 Diag(SS.getRange().getBegin(), 4117 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4118 << (NestedNameSpecifier*) SS.getScopeRep() 4119 << cast<CXXRecordDecl>(CurContext) 4120 << SS.getRange(); 4121 4122 return true; 4123} 4124 4125Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4126 SourceLocation NamespaceLoc, 4127 SourceLocation AliasLoc, 4128 IdentifierInfo *Alias, 4129 CXXScopeSpec &SS, 4130 SourceLocation IdentLoc, 4131 IdentifierInfo *Ident) { 4132 4133 // Lookup the namespace name. 4134 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4135 LookupParsedName(R, S, &SS); 4136 4137 // Check if we have a previous declaration with the same name. 4138 NamedDecl *PrevDecl 4139 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4140 ForRedeclaration); 4141 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4142 PrevDecl = 0; 4143 4144 if (PrevDecl) { 4145 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4146 // We already have an alias with the same name that points to the same 4147 // namespace, so don't create a new one. 4148 // FIXME: At some point, we'll want to create the (redundant) 4149 // declaration to maintain better source information. 4150 if (!R.isAmbiguous() && !R.empty() && 4151 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4152 return 0; 4153 } 4154 4155 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4156 diag::err_redefinition_different_kind; 4157 Diag(AliasLoc, DiagID) << Alias; 4158 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4159 return 0; 4160 } 4161 4162 if (R.isAmbiguous()) 4163 return 0; 4164 4165 if (R.empty()) { 4166 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4167 CTC_NoKeywords, 0)) { 4168 if (R.getAsSingle<NamespaceDecl>() || 4169 R.getAsSingle<NamespaceAliasDecl>()) { 4170 if (DeclContext *DC = computeDeclContext(SS, false)) 4171 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4172 << Ident << DC << Corrected << SS.getRange() 4173 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4174 else 4175 Diag(IdentLoc, diag::err_using_directive_suggest) 4176 << Ident << Corrected 4177 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4178 4179 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4180 << Corrected; 4181 4182 Ident = Corrected.getAsIdentifierInfo(); 4183 } else { 4184 R.clear(); 4185 R.setLookupName(Ident); 4186 } 4187 } 4188 4189 if (R.empty()) { 4190 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4191 return 0; 4192 } 4193 } 4194 4195 NamespaceAliasDecl *AliasDecl = 4196 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4197 Alias, SS.getRange(), 4198 (NestedNameSpecifier *)SS.getScopeRep(), 4199 IdentLoc, R.getFoundDecl()); 4200 4201 PushOnScopeChains(AliasDecl, S); 4202 return AliasDecl; 4203} 4204 4205namespace { 4206 /// \brief Scoped object used to handle the state changes required in Sema 4207 /// to implicitly define the body of a C++ member function; 4208 class ImplicitlyDefinedFunctionScope { 4209 Sema &S; 4210 DeclContext *PreviousContext; 4211 4212 public: 4213 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4214 : S(S), PreviousContext(S.CurContext) 4215 { 4216 S.CurContext = Method; 4217 S.PushFunctionScope(); 4218 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4219 } 4220 4221 ~ImplicitlyDefinedFunctionScope() { 4222 S.PopExpressionEvaluationContext(); 4223 S.PopFunctionOrBlockScope(); 4224 S.CurContext = PreviousContext; 4225 } 4226 }; 4227} 4228 4229static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4230 CXXRecordDecl *D) { 4231 ASTContext &Context = Self.Context; 4232 QualType ClassType = Context.getTypeDeclType(D); 4233 DeclarationName ConstructorName 4234 = Context.DeclarationNames.getCXXConstructorName( 4235 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4236 4237 DeclContext::lookup_const_iterator Con, ConEnd; 4238 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4239 Con != ConEnd; ++Con) { 4240 // FIXME: In C++0x, a constructor template can be a default constructor. 4241 if (isa<FunctionTemplateDecl>(*Con)) 4242 continue; 4243 4244 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4245 if (Constructor->isDefaultConstructor()) 4246 return Constructor; 4247 } 4248 return 0; 4249} 4250 4251CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4252 CXXRecordDecl *ClassDecl) { 4253 // C++ [class.ctor]p5: 4254 // A default constructor for a class X is a constructor of class X 4255 // that can be called without an argument. If there is no 4256 // user-declared constructor for class X, a default constructor is 4257 // implicitly declared. An implicitly-declared default constructor 4258 // is an inline public member of its class. 4259 assert(!ClassDecl->hasUserDeclaredConstructor() && 4260 "Should not build implicit default constructor!"); 4261 4262 // C++ [except.spec]p14: 4263 // An implicitly declared special member function (Clause 12) shall have an 4264 // exception-specification. [...] 4265 ImplicitExceptionSpecification ExceptSpec(Context); 4266 4267 // Direct base-class destructors. 4268 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4269 BEnd = ClassDecl->bases_end(); 4270 B != BEnd; ++B) { 4271 if (B->isVirtual()) // Handled below. 4272 continue; 4273 4274 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4275 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4276 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4277 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4278 else if (CXXConstructorDecl *Constructor 4279 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4280 ExceptSpec.CalledDecl(Constructor); 4281 } 4282 } 4283 4284 // Virtual base-class destructors. 4285 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4286 BEnd = ClassDecl->vbases_end(); 4287 B != BEnd; ++B) { 4288 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4289 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4290 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4291 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4292 else if (CXXConstructorDecl *Constructor 4293 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4294 ExceptSpec.CalledDecl(Constructor); 4295 } 4296 } 4297 4298 // Field destructors. 4299 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4300 FEnd = ClassDecl->field_end(); 4301 F != FEnd; ++F) { 4302 if (const RecordType *RecordTy 4303 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4304 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4305 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4306 ExceptSpec.CalledDecl( 4307 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4308 else if (CXXConstructorDecl *Constructor 4309 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4310 ExceptSpec.CalledDecl(Constructor); 4311 } 4312 } 4313 4314 4315 // Create the actual constructor declaration. 4316 CanQualType ClassType 4317 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4318 DeclarationName Name 4319 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4320 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4321 CXXConstructorDecl *DefaultCon 4322 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4323 Context.getFunctionType(Context.VoidTy, 4324 0, 0, false, 0, 4325 ExceptSpec.hasExceptionSpecification(), 4326 ExceptSpec.hasAnyExceptionSpecification(), 4327 ExceptSpec.size(), 4328 ExceptSpec.data(), 4329 FunctionType::ExtInfo()), 4330 /*TInfo=*/0, 4331 /*isExplicit=*/false, 4332 /*isInline=*/true, 4333 /*isImplicitlyDeclared=*/true); 4334 DefaultCon->setAccess(AS_public); 4335 DefaultCon->setImplicit(); 4336 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4337 4338 // Note that we have declared this constructor. 4339 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4340 4341 if (Scope *S = getScopeForContext(ClassDecl)) 4342 PushOnScopeChains(DefaultCon, S, false); 4343 ClassDecl->addDecl(DefaultCon); 4344 4345 return DefaultCon; 4346} 4347 4348void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4349 CXXConstructorDecl *Constructor) { 4350 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4351 !Constructor->isUsed(false)) && 4352 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4353 4354 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4355 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4356 4357 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4358 DiagnosticErrorTrap Trap(Diags); 4359 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4360 Trap.hasErrorOccurred()) { 4361 Diag(CurrentLocation, diag::note_member_synthesized_at) 4362 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4363 Constructor->setInvalidDecl(); 4364 return; 4365 } 4366 4367 SourceLocation Loc = Constructor->getLocation(); 4368 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4369 4370 Constructor->setUsed(); 4371 MarkVTableUsed(CurrentLocation, ClassDecl); 4372} 4373 4374CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4375 // C++ [class.dtor]p2: 4376 // If a class has no user-declared destructor, a destructor is 4377 // declared implicitly. An implicitly-declared destructor is an 4378 // inline public member of its class. 4379 4380 // C++ [except.spec]p14: 4381 // An implicitly declared special member function (Clause 12) shall have 4382 // an exception-specification. 4383 ImplicitExceptionSpecification ExceptSpec(Context); 4384 4385 // Direct base-class destructors. 4386 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4387 BEnd = ClassDecl->bases_end(); 4388 B != BEnd; ++B) { 4389 if (B->isVirtual()) // Handled below. 4390 continue; 4391 4392 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4393 ExceptSpec.CalledDecl( 4394 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4395 } 4396 4397 // Virtual base-class destructors. 4398 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4399 BEnd = ClassDecl->vbases_end(); 4400 B != BEnd; ++B) { 4401 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4402 ExceptSpec.CalledDecl( 4403 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4404 } 4405 4406 // Field destructors. 4407 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4408 FEnd = ClassDecl->field_end(); 4409 F != FEnd; ++F) { 4410 if (const RecordType *RecordTy 4411 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4412 ExceptSpec.CalledDecl( 4413 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4414 } 4415 4416 // Create the actual destructor declaration. 4417 QualType Ty = Context.getFunctionType(Context.VoidTy, 4418 0, 0, false, 0, 4419 ExceptSpec.hasExceptionSpecification(), 4420 ExceptSpec.hasAnyExceptionSpecification(), 4421 ExceptSpec.size(), 4422 ExceptSpec.data(), 4423 FunctionType::ExtInfo()); 4424 4425 CanQualType ClassType 4426 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4427 DeclarationName Name 4428 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4429 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4430 CXXDestructorDecl *Destructor 4431 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 0, 4432 /*isInline=*/true, 4433 /*isImplicitlyDeclared=*/true); 4434 Destructor->setAccess(AS_public); 4435 Destructor->setImplicit(); 4436 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4437 4438 // Note that we have declared this destructor. 4439 ++ASTContext::NumImplicitDestructorsDeclared; 4440 4441 // Introduce this destructor into its scope. 4442 if (Scope *S = getScopeForContext(ClassDecl)) 4443 PushOnScopeChains(Destructor, S, false); 4444 ClassDecl->addDecl(Destructor); 4445 4446 // This could be uniqued if it ever proves significant. 4447 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4448 4449 AddOverriddenMethods(ClassDecl, Destructor); 4450 4451 return Destructor; 4452} 4453 4454void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4455 CXXDestructorDecl *Destructor) { 4456 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4457 "DefineImplicitDestructor - call it for implicit default dtor"); 4458 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4459 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4460 4461 if (Destructor->isInvalidDecl()) 4462 return; 4463 4464 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4465 4466 DiagnosticErrorTrap Trap(Diags); 4467 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4468 Destructor->getParent()); 4469 4470 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4471 Diag(CurrentLocation, diag::note_member_synthesized_at) 4472 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4473 4474 Destructor->setInvalidDecl(); 4475 return; 4476 } 4477 4478 SourceLocation Loc = Destructor->getLocation(); 4479 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4480 4481 Destructor->setUsed(); 4482 MarkVTableUsed(CurrentLocation, ClassDecl); 4483} 4484 4485/// \brief Builds a statement that copies the given entity from \p From to 4486/// \c To. 4487/// 4488/// This routine is used to copy the members of a class with an 4489/// implicitly-declared copy assignment operator. When the entities being 4490/// copied are arrays, this routine builds for loops to copy them. 4491/// 4492/// \param S The Sema object used for type-checking. 4493/// 4494/// \param Loc The location where the implicit copy is being generated. 4495/// 4496/// \param T The type of the expressions being copied. Both expressions must 4497/// have this type. 4498/// 4499/// \param To The expression we are copying to. 4500/// 4501/// \param From The expression we are copying from. 4502/// 4503/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4504/// Otherwise, it's a non-static member subobject. 4505/// 4506/// \param Depth Internal parameter recording the depth of the recursion. 4507/// 4508/// \returns A statement or a loop that copies the expressions. 4509static StmtResult 4510BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4511 Expr *To, Expr *From, 4512 bool CopyingBaseSubobject, unsigned Depth = 0) { 4513 // C++0x [class.copy]p30: 4514 // Each subobject is assigned in the manner appropriate to its type: 4515 // 4516 // - if the subobject is of class type, the copy assignment operator 4517 // for the class is used (as if by explicit qualification; that is, 4518 // ignoring any possible virtual overriding functions in more derived 4519 // classes); 4520 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4521 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4522 4523 // Look for operator=. 4524 DeclarationName Name 4525 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4526 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4527 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4528 4529 // Filter out any result that isn't a copy-assignment operator. 4530 LookupResult::Filter F = OpLookup.makeFilter(); 4531 while (F.hasNext()) { 4532 NamedDecl *D = F.next(); 4533 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4534 if (Method->isCopyAssignmentOperator()) 4535 continue; 4536 4537 F.erase(); 4538 } 4539 F.done(); 4540 4541 // Suppress the protected check (C++ [class.protected]) for each of the 4542 // assignment operators we found. This strange dance is required when 4543 // we're assigning via a base classes's copy-assignment operator. To 4544 // ensure that we're getting the right base class subobject (without 4545 // ambiguities), we need to cast "this" to that subobject type; to 4546 // ensure that we don't go through the virtual call mechanism, we need 4547 // to qualify the operator= name with the base class (see below). However, 4548 // this means that if the base class has a protected copy assignment 4549 // operator, the protected member access check will fail. So, we 4550 // rewrite "protected" access to "public" access in this case, since we 4551 // know by construction that we're calling from a derived class. 4552 if (CopyingBaseSubobject) { 4553 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4554 L != LEnd; ++L) { 4555 if (L.getAccess() == AS_protected) 4556 L.setAccess(AS_public); 4557 } 4558 } 4559 4560 // Create the nested-name-specifier that will be used to qualify the 4561 // reference to operator=; this is required to suppress the virtual 4562 // call mechanism. 4563 CXXScopeSpec SS; 4564 SS.setRange(Loc); 4565 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4566 T.getTypePtr())); 4567 4568 // Create the reference to operator=. 4569 ExprResult OpEqualRef 4570 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4571 /*FirstQualifierInScope=*/0, OpLookup, 4572 /*TemplateArgs=*/0, 4573 /*SuppressQualifierCheck=*/true); 4574 if (OpEqualRef.isInvalid()) 4575 return StmtError(); 4576 4577 // Build the call to the assignment operator. 4578 4579 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4580 OpEqualRef.takeAs<Expr>(), 4581 Loc, &From, 1, Loc); 4582 if (Call.isInvalid()) 4583 return StmtError(); 4584 4585 return S.Owned(Call.takeAs<Stmt>()); 4586 } 4587 4588 // - if the subobject is of scalar type, the built-in assignment 4589 // operator is used. 4590 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4591 if (!ArrayTy) { 4592 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4593 if (Assignment.isInvalid()) 4594 return StmtError(); 4595 4596 return S.Owned(Assignment.takeAs<Stmt>()); 4597 } 4598 4599 // - if the subobject is an array, each element is assigned, in the 4600 // manner appropriate to the element type; 4601 4602 // Construct a loop over the array bounds, e.g., 4603 // 4604 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4605 // 4606 // that will copy each of the array elements. 4607 QualType SizeType = S.Context.getSizeType(); 4608 4609 // Create the iteration variable. 4610 IdentifierInfo *IterationVarName = 0; 4611 { 4612 llvm::SmallString<8> Str; 4613 llvm::raw_svector_ostream OS(Str); 4614 OS << "__i" << Depth; 4615 IterationVarName = &S.Context.Idents.get(OS.str()); 4616 } 4617 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4618 IterationVarName, SizeType, 4619 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4620 SC_None, SC_None); 4621 4622 // Initialize the iteration variable to zero. 4623 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4624 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4625 4626 // Create a reference to the iteration variable; we'll use this several 4627 // times throughout. 4628 Expr *IterationVarRef 4629 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 4630 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4631 4632 // Create the DeclStmt that holds the iteration variable. 4633 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4634 4635 // Create the comparison against the array bound. 4636 llvm::APInt Upper 4637 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 4638 Expr *Comparison 4639 = new (S.Context) BinaryOperator(IterationVarRef, 4640 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 4641 BO_NE, S.Context.BoolTy, 4642 VK_RValue, OK_Ordinary, Loc); 4643 4644 // Create the pre-increment of the iteration variable. 4645 Expr *Increment 4646 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 4647 VK_LValue, OK_Ordinary, Loc); 4648 4649 // Subscript the "from" and "to" expressions with the iteration variable. 4650 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4651 IterationVarRef, Loc)); 4652 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4653 IterationVarRef, Loc)); 4654 4655 // Build the copy for an individual element of the array. 4656 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 4657 To, From, CopyingBaseSubobject, 4658 Depth + 1); 4659 if (Copy.isInvalid()) 4660 return StmtError(); 4661 4662 // Construct the loop that copies all elements of this array. 4663 return S.ActOnForStmt(Loc, Loc, InitStmt, 4664 S.MakeFullExpr(Comparison), 4665 0, S.MakeFullExpr(Increment), 4666 Loc, Copy.take()); 4667} 4668 4669/// \brief Determine whether the given class has a copy assignment operator 4670/// that accepts a const-qualified argument. 4671static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4672 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4673 4674 if (!Class->hasDeclaredCopyAssignment()) 4675 S.DeclareImplicitCopyAssignment(Class); 4676 4677 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4678 DeclarationName OpName 4679 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4680 4681 DeclContext::lookup_const_iterator Op, OpEnd; 4682 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4683 // C++ [class.copy]p9: 4684 // A user-declared copy assignment operator is a non-static non-template 4685 // member function of class X with exactly one parameter of type X, X&, 4686 // const X&, volatile X& or const volatile X&. 4687 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4688 if (!Method) 4689 continue; 4690 4691 if (Method->isStatic()) 4692 continue; 4693 if (Method->getPrimaryTemplate()) 4694 continue; 4695 const FunctionProtoType *FnType = 4696 Method->getType()->getAs<FunctionProtoType>(); 4697 assert(FnType && "Overloaded operator has no prototype."); 4698 // Don't assert on this; an invalid decl might have been left in the AST. 4699 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4700 continue; 4701 bool AcceptsConst = true; 4702 QualType ArgType = FnType->getArgType(0); 4703 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4704 ArgType = Ref->getPointeeType(); 4705 // Is it a non-const lvalue reference? 4706 if (!ArgType.isConstQualified()) 4707 AcceptsConst = false; 4708 } 4709 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4710 continue; 4711 4712 // We have a single argument of type cv X or cv X&, i.e. we've found the 4713 // copy assignment operator. Return whether it accepts const arguments. 4714 return AcceptsConst; 4715 } 4716 assert(Class->isInvalidDecl() && 4717 "No copy assignment operator declared in valid code."); 4718 return false; 4719} 4720 4721CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4722 // Note: The following rules are largely analoguous to the copy 4723 // constructor rules. Note that virtual bases are not taken into account 4724 // for determining the argument type of the operator. Note also that 4725 // operators taking an object instead of a reference are allowed. 4726 4727 4728 // C++ [class.copy]p10: 4729 // If the class definition does not explicitly declare a copy 4730 // assignment operator, one is declared implicitly. 4731 // The implicitly-defined copy assignment operator for a class X 4732 // will have the form 4733 // 4734 // X& X::operator=(const X&) 4735 // 4736 // if 4737 bool HasConstCopyAssignment = true; 4738 4739 // -- each direct base class B of X has a copy assignment operator 4740 // whose parameter is of type const B&, const volatile B& or B, 4741 // and 4742 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4743 BaseEnd = ClassDecl->bases_end(); 4744 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4745 assert(!Base->getType()->isDependentType() && 4746 "Cannot generate implicit members for class with dependent bases."); 4747 const CXXRecordDecl *BaseClassDecl 4748 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4749 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4750 } 4751 4752 // -- for all the nonstatic data members of X that are of a class 4753 // type M (or array thereof), each such class type has a copy 4754 // assignment operator whose parameter is of type const M&, 4755 // const volatile M& or M. 4756 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4757 FieldEnd = ClassDecl->field_end(); 4758 HasConstCopyAssignment && Field != FieldEnd; 4759 ++Field) { 4760 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4761 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4762 const CXXRecordDecl *FieldClassDecl 4763 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4764 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4765 } 4766 } 4767 4768 // Otherwise, the implicitly declared copy assignment operator will 4769 // have the form 4770 // 4771 // X& X::operator=(X&) 4772 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4773 QualType RetType = Context.getLValueReferenceType(ArgType); 4774 if (HasConstCopyAssignment) 4775 ArgType = ArgType.withConst(); 4776 ArgType = Context.getLValueReferenceType(ArgType); 4777 4778 // C++ [except.spec]p14: 4779 // An implicitly declared special member function (Clause 12) shall have an 4780 // exception-specification. [...] 4781 ImplicitExceptionSpecification ExceptSpec(Context); 4782 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4783 BaseEnd = ClassDecl->bases_end(); 4784 Base != BaseEnd; ++Base) { 4785 CXXRecordDecl *BaseClassDecl 4786 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4787 4788 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4789 DeclareImplicitCopyAssignment(BaseClassDecl); 4790 4791 if (CXXMethodDecl *CopyAssign 4792 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4793 ExceptSpec.CalledDecl(CopyAssign); 4794 } 4795 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4796 FieldEnd = ClassDecl->field_end(); 4797 Field != FieldEnd; 4798 ++Field) { 4799 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4800 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4801 CXXRecordDecl *FieldClassDecl 4802 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4803 4804 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4805 DeclareImplicitCopyAssignment(FieldClassDecl); 4806 4807 if (CXXMethodDecl *CopyAssign 4808 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4809 ExceptSpec.CalledDecl(CopyAssign); 4810 } 4811 } 4812 4813 // An implicitly-declared copy assignment operator is an inline public 4814 // member of its class. 4815 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4816 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4817 CXXMethodDecl *CopyAssignment 4818 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4819 Context.getFunctionType(RetType, &ArgType, 1, 4820 false, 0, 4821 ExceptSpec.hasExceptionSpecification(), 4822 ExceptSpec.hasAnyExceptionSpecification(), 4823 ExceptSpec.size(), 4824 ExceptSpec.data(), 4825 FunctionType::ExtInfo()), 4826 /*TInfo=*/0, /*isStatic=*/false, 4827 /*StorageClassAsWritten=*/SC_None, 4828 /*isInline=*/true); 4829 CopyAssignment->setAccess(AS_public); 4830 CopyAssignment->setImplicit(); 4831 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4832 4833 // Add the parameter to the operator. 4834 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4835 ClassDecl->getLocation(), 4836 /*Id=*/0, 4837 ArgType, /*TInfo=*/0, 4838 SC_None, 4839 SC_None, 0); 4840 CopyAssignment->setParams(&FromParam, 1); 4841 4842 // Note that we have added this copy-assignment operator. 4843 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4844 4845 if (Scope *S = getScopeForContext(ClassDecl)) 4846 PushOnScopeChains(CopyAssignment, S, false); 4847 ClassDecl->addDecl(CopyAssignment); 4848 4849 AddOverriddenMethods(ClassDecl, CopyAssignment); 4850 return CopyAssignment; 4851} 4852 4853void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4854 CXXMethodDecl *CopyAssignOperator) { 4855 assert((CopyAssignOperator->isImplicit() && 4856 CopyAssignOperator->isOverloadedOperator() && 4857 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4858 !CopyAssignOperator->isUsed(false)) && 4859 "DefineImplicitCopyAssignment called for wrong function"); 4860 4861 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4862 4863 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4864 CopyAssignOperator->setInvalidDecl(); 4865 return; 4866 } 4867 4868 CopyAssignOperator->setUsed(); 4869 4870 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4871 DiagnosticErrorTrap Trap(Diags); 4872 4873 // C++0x [class.copy]p30: 4874 // The implicitly-defined or explicitly-defaulted copy assignment operator 4875 // for a non-union class X performs memberwise copy assignment of its 4876 // subobjects. The direct base classes of X are assigned first, in the 4877 // order of their declaration in the base-specifier-list, and then the 4878 // immediate non-static data members of X are assigned, in the order in 4879 // which they were declared in the class definition. 4880 4881 // The statements that form the synthesized function body. 4882 ASTOwningVector<Stmt*> Statements(*this); 4883 4884 // The parameter for the "other" object, which we are copying from. 4885 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4886 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4887 QualType OtherRefType = Other->getType(); 4888 if (const LValueReferenceType *OtherRef 4889 = OtherRefType->getAs<LValueReferenceType>()) { 4890 OtherRefType = OtherRef->getPointeeType(); 4891 OtherQuals = OtherRefType.getQualifiers(); 4892 } 4893 4894 // Our location for everything implicitly-generated. 4895 SourceLocation Loc = CopyAssignOperator->getLocation(); 4896 4897 // Construct a reference to the "other" object. We'll be using this 4898 // throughout the generated ASTs. 4899 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 4900 assert(OtherRef && "Reference to parameter cannot fail!"); 4901 4902 // Construct the "this" pointer. We'll be using this throughout the generated 4903 // ASTs. 4904 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4905 assert(This && "Reference to this cannot fail!"); 4906 4907 // Assign base classes. 4908 bool Invalid = false; 4909 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4910 E = ClassDecl->bases_end(); Base != E; ++Base) { 4911 // Form the assignment: 4912 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4913 QualType BaseType = Base->getType().getUnqualifiedType(); 4914 CXXRecordDecl *BaseClassDecl = 0; 4915 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4916 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4917 else { 4918 Invalid = true; 4919 continue; 4920 } 4921 4922 CXXCastPath BasePath; 4923 BasePath.push_back(Base); 4924 4925 // Construct the "from" expression, which is an implicit cast to the 4926 // appropriately-qualified base type. 4927 Expr *From = OtherRef; 4928 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4929 CK_UncheckedDerivedToBase, 4930 VK_LValue, &BasePath); 4931 4932 // Dereference "this". 4933 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4934 4935 // Implicitly cast "this" to the appropriately-qualified base type. 4936 Expr *ToE = To.takeAs<Expr>(); 4937 ImpCastExprToType(ToE, 4938 Context.getCVRQualifiedType(BaseType, 4939 CopyAssignOperator->getTypeQualifiers()), 4940 CK_UncheckedDerivedToBase, 4941 VK_LValue, &BasePath); 4942 To = Owned(ToE); 4943 4944 // Build the copy. 4945 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4946 To.get(), From, 4947 /*CopyingBaseSubobject=*/true); 4948 if (Copy.isInvalid()) { 4949 Diag(CurrentLocation, diag::note_member_synthesized_at) 4950 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4951 CopyAssignOperator->setInvalidDecl(); 4952 return; 4953 } 4954 4955 // Success! Record the copy. 4956 Statements.push_back(Copy.takeAs<Expr>()); 4957 } 4958 4959 // \brief Reference to the __builtin_memcpy function. 4960 Expr *BuiltinMemCpyRef = 0; 4961 // \brief Reference to the __builtin_objc_memmove_collectable function. 4962 Expr *CollectableMemCpyRef = 0; 4963 4964 // Assign non-static members. 4965 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4966 FieldEnd = ClassDecl->field_end(); 4967 Field != FieldEnd; ++Field) { 4968 // Check for members of reference type; we can't copy those. 4969 if (Field->getType()->isReferenceType()) { 4970 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4971 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4972 Diag(Field->getLocation(), diag::note_declared_at); 4973 Diag(CurrentLocation, diag::note_member_synthesized_at) 4974 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4975 Invalid = true; 4976 continue; 4977 } 4978 4979 // Check for members of const-qualified, non-class type. 4980 QualType BaseType = Context.getBaseElementType(Field->getType()); 4981 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4982 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4983 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4984 Diag(Field->getLocation(), diag::note_declared_at); 4985 Diag(CurrentLocation, diag::note_member_synthesized_at) 4986 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4987 Invalid = true; 4988 continue; 4989 } 4990 4991 QualType FieldType = Field->getType().getNonReferenceType(); 4992 if (FieldType->isIncompleteArrayType()) { 4993 assert(ClassDecl->hasFlexibleArrayMember() && 4994 "Incomplete array type is not valid"); 4995 continue; 4996 } 4997 4998 // Build references to the field in the object we're copying from and to. 4999 CXXScopeSpec SS; // Intentionally empty 5000 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5001 LookupMemberName); 5002 MemberLookup.addDecl(*Field); 5003 MemberLookup.resolveKind(); 5004 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5005 Loc, /*IsArrow=*/false, 5006 SS, 0, MemberLookup, 0); 5007 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5008 Loc, /*IsArrow=*/true, 5009 SS, 0, MemberLookup, 0); 5010 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5011 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5012 5013 // If the field should be copied with __builtin_memcpy rather than via 5014 // explicit assignments, do so. This optimization only applies for arrays 5015 // of scalars and arrays of class type with trivial copy-assignment 5016 // operators. 5017 if (FieldType->isArrayType() && 5018 (!BaseType->isRecordType() || 5019 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5020 ->hasTrivialCopyAssignment())) { 5021 // Compute the size of the memory buffer to be copied. 5022 QualType SizeType = Context.getSizeType(); 5023 llvm::APInt Size(Context.getTypeSize(SizeType), 5024 Context.getTypeSizeInChars(BaseType).getQuantity()); 5025 for (const ConstantArrayType *Array 5026 = Context.getAsConstantArrayType(FieldType); 5027 Array; 5028 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5029 llvm::APInt ArraySize 5030 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5031 Size *= ArraySize; 5032 } 5033 5034 // Take the address of the field references for "from" and "to". 5035 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5036 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5037 5038 bool NeedsCollectableMemCpy = 5039 (BaseType->isRecordType() && 5040 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5041 5042 if (NeedsCollectableMemCpy) { 5043 if (!CollectableMemCpyRef) { 5044 // Create a reference to the __builtin_objc_memmove_collectable function. 5045 LookupResult R(*this, 5046 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5047 Loc, LookupOrdinaryName); 5048 LookupName(R, TUScope, true); 5049 5050 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5051 if (!CollectableMemCpy) { 5052 // Something went horribly wrong earlier, and we will have 5053 // complained about it. 5054 Invalid = true; 5055 continue; 5056 } 5057 5058 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5059 CollectableMemCpy->getType(), 5060 VK_LValue, Loc, 0).take(); 5061 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5062 } 5063 } 5064 // Create a reference to the __builtin_memcpy builtin function. 5065 else if (!BuiltinMemCpyRef) { 5066 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5067 LookupOrdinaryName); 5068 LookupName(R, TUScope, true); 5069 5070 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5071 if (!BuiltinMemCpy) { 5072 // Something went horribly wrong earlier, and we will have complained 5073 // about it. 5074 Invalid = true; 5075 continue; 5076 } 5077 5078 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5079 BuiltinMemCpy->getType(), 5080 VK_LValue, Loc, 0).take(); 5081 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5082 } 5083 5084 ASTOwningVector<Expr*> CallArgs(*this); 5085 CallArgs.push_back(To.takeAs<Expr>()); 5086 CallArgs.push_back(From.takeAs<Expr>()); 5087 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5088 ExprResult Call = ExprError(); 5089 if (NeedsCollectableMemCpy) 5090 Call = ActOnCallExpr(/*Scope=*/0, 5091 CollectableMemCpyRef, 5092 Loc, move_arg(CallArgs), 5093 Loc); 5094 else 5095 Call = ActOnCallExpr(/*Scope=*/0, 5096 BuiltinMemCpyRef, 5097 Loc, move_arg(CallArgs), 5098 Loc); 5099 5100 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5101 Statements.push_back(Call.takeAs<Expr>()); 5102 continue; 5103 } 5104 5105 // Build the copy of this field. 5106 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5107 To.get(), From.get(), 5108 /*CopyingBaseSubobject=*/false); 5109 if (Copy.isInvalid()) { 5110 Diag(CurrentLocation, diag::note_member_synthesized_at) 5111 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5112 CopyAssignOperator->setInvalidDecl(); 5113 return; 5114 } 5115 5116 // Success! Record the copy. 5117 Statements.push_back(Copy.takeAs<Stmt>()); 5118 } 5119 5120 if (!Invalid) { 5121 // Add a "return *this;" 5122 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5123 5124 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5125 if (Return.isInvalid()) 5126 Invalid = true; 5127 else { 5128 Statements.push_back(Return.takeAs<Stmt>()); 5129 5130 if (Trap.hasErrorOccurred()) { 5131 Diag(CurrentLocation, diag::note_member_synthesized_at) 5132 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5133 Invalid = true; 5134 } 5135 } 5136 } 5137 5138 if (Invalid) { 5139 CopyAssignOperator->setInvalidDecl(); 5140 return; 5141 } 5142 5143 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5144 /*isStmtExpr=*/false); 5145 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5146 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5147} 5148 5149CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5150 CXXRecordDecl *ClassDecl) { 5151 // C++ [class.copy]p4: 5152 // If the class definition does not explicitly declare a copy 5153 // constructor, one is declared implicitly. 5154 5155 // C++ [class.copy]p5: 5156 // The implicitly-declared copy constructor for a class X will 5157 // have the form 5158 // 5159 // X::X(const X&) 5160 // 5161 // if 5162 bool HasConstCopyConstructor = true; 5163 5164 // -- each direct or virtual base class B of X has a copy 5165 // constructor whose first parameter is of type const B& or 5166 // const volatile B&, and 5167 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5168 BaseEnd = ClassDecl->bases_end(); 5169 HasConstCopyConstructor && Base != BaseEnd; 5170 ++Base) { 5171 // Virtual bases are handled below. 5172 if (Base->isVirtual()) 5173 continue; 5174 5175 CXXRecordDecl *BaseClassDecl 5176 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5177 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5178 DeclareImplicitCopyConstructor(BaseClassDecl); 5179 5180 HasConstCopyConstructor 5181 = BaseClassDecl->hasConstCopyConstructor(Context); 5182 } 5183 5184 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5185 BaseEnd = ClassDecl->vbases_end(); 5186 HasConstCopyConstructor && Base != BaseEnd; 5187 ++Base) { 5188 CXXRecordDecl *BaseClassDecl 5189 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5190 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5191 DeclareImplicitCopyConstructor(BaseClassDecl); 5192 5193 HasConstCopyConstructor 5194 = BaseClassDecl->hasConstCopyConstructor(Context); 5195 } 5196 5197 // -- for all the nonstatic data members of X that are of a 5198 // class type M (or array thereof), each such class type 5199 // has a copy constructor whose first parameter is of type 5200 // const M& or const volatile M&. 5201 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5202 FieldEnd = ClassDecl->field_end(); 5203 HasConstCopyConstructor && Field != FieldEnd; 5204 ++Field) { 5205 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5206 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5207 CXXRecordDecl *FieldClassDecl 5208 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5209 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5210 DeclareImplicitCopyConstructor(FieldClassDecl); 5211 5212 HasConstCopyConstructor 5213 = FieldClassDecl->hasConstCopyConstructor(Context); 5214 } 5215 } 5216 5217 // Otherwise, the implicitly declared copy constructor will have 5218 // the form 5219 // 5220 // X::X(X&) 5221 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5222 QualType ArgType = ClassType; 5223 if (HasConstCopyConstructor) 5224 ArgType = ArgType.withConst(); 5225 ArgType = Context.getLValueReferenceType(ArgType); 5226 5227 // C++ [except.spec]p14: 5228 // An implicitly declared special member function (Clause 12) shall have an 5229 // exception-specification. [...] 5230 ImplicitExceptionSpecification ExceptSpec(Context); 5231 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5232 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5233 BaseEnd = ClassDecl->bases_end(); 5234 Base != BaseEnd; 5235 ++Base) { 5236 // Virtual bases are handled below. 5237 if (Base->isVirtual()) 5238 continue; 5239 5240 CXXRecordDecl *BaseClassDecl 5241 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5242 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5243 DeclareImplicitCopyConstructor(BaseClassDecl); 5244 5245 if (CXXConstructorDecl *CopyConstructor 5246 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5247 ExceptSpec.CalledDecl(CopyConstructor); 5248 } 5249 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5250 BaseEnd = ClassDecl->vbases_end(); 5251 Base != BaseEnd; 5252 ++Base) { 5253 CXXRecordDecl *BaseClassDecl 5254 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5255 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5256 DeclareImplicitCopyConstructor(BaseClassDecl); 5257 5258 if (CXXConstructorDecl *CopyConstructor 5259 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5260 ExceptSpec.CalledDecl(CopyConstructor); 5261 } 5262 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5263 FieldEnd = ClassDecl->field_end(); 5264 Field != FieldEnd; 5265 ++Field) { 5266 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5267 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5268 CXXRecordDecl *FieldClassDecl 5269 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5270 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5271 DeclareImplicitCopyConstructor(FieldClassDecl); 5272 5273 if (CXXConstructorDecl *CopyConstructor 5274 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5275 ExceptSpec.CalledDecl(CopyConstructor); 5276 } 5277 } 5278 5279 // An implicitly-declared copy constructor is an inline public 5280 // member of its class. 5281 DeclarationName Name 5282 = Context.DeclarationNames.getCXXConstructorName( 5283 Context.getCanonicalType(ClassType)); 5284 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5285 CXXConstructorDecl *CopyConstructor 5286 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5287 Context.getFunctionType(Context.VoidTy, 5288 &ArgType, 1, 5289 false, 0, 5290 ExceptSpec.hasExceptionSpecification(), 5291 ExceptSpec.hasAnyExceptionSpecification(), 5292 ExceptSpec.size(), 5293 ExceptSpec.data(), 5294 FunctionType::ExtInfo()), 5295 /*TInfo=*/0, 5296 /*isExplicit=*/false, 5297 /*isInline=*/true, 5298 /*isImplicitlyDeclared=*/true); 5299 CopyConstructor->setAccess(AS_public); 5300 CopyConstructor->setImplicit(); 5301 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5302 5303 // Note that we have declared this constructor. 5304 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5305 5306 // Add the parameter to the constructor. 5307 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5308 ClassDecl->getLocation(), 5309 /*IdentifierInfo=*/0, 5310 ArgType, /*TInfo=*/0, 5311 SC_None, 5312 SC_None, 0); 5313 CopyConstructor->setParams(&FromParam, 1); 5314 if (Scope *S = getScopeForContext(ClassDecl)) 5315 PushOnScopeChains(CopyConstructor, S, false); 5316 ClassDecl->addDecl(CopyConstructor); 5317 5318 return CopyConstructor; 5319} 5320 5321void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5322 CXXConstructorDecl *CopyConstructor, 5323 unsigned TypeQuals) { 5324 assert((CopyConstructor->isImplicit() && 5325 CopyConstructor->isCopyConstructor(TypeQuals) && 5326 !CopyConstructor->isUsed(false)) && 5327 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5328 5329 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5330 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5331 5332 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5333 DiagnosticErrorTrap Trap(Diags); 5334 5335 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5336 Trap.hasErrorOccurred()) { 5337 Diag(CurrentLocation, diag::note_member_synthesized_at) 5338 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5339 CopyConstructor->setInvalidDecl(); 5340 } else { 5341 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5342 CopyConstructor->getLocation(), 5343 MultiStmtArg(*this, 0, 0), 5344 /*isStmtExpr=*/false) 5345 .takeAs<Stmt>()); 5346 } 5347 5348 CopyConstructor->setUsed(); 5349} 5350 5351ExprResult 5352Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5353 CXXConstructorDecl *Constructor, 5354 MultiExprArg ExprArgs, 5355 bool RequiresZeroInit, 5356 unsigned ConstructKind, 5357 SourceRange ParenRange) { 5358 bool Elidable = false; 5359 5360 // C++0x [class.copy]p34: 5361 // When certain criteria are met, an implementation is allowed to 5362 // omit the copy/move construction of a class object, even if the 5363 // copy/move constructor and/or destructor for the object have 5364 // side effects. [...] 5365 // - when a temporary class object that has not been bound to a 5366 // reference (12.2) would be copied/moved to a class object 5367 // with the same cv-unqualified type, the copy/move operation 5368 // can be omitted by constructing the temporary object 5369 // directly into the target of the omitted copy/move 5370 if (ConstructKind == CXXConstructExpr::CK_Complete && 5371 Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5372 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5373 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5374 } 5375 5376 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5377 Elidable, move(ExprArgs), RequiresZeroInit, 5378 ConstructKind, ParenRange); 5379} 5380 5381/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5382/// including handling of its default argument expressions. 5383ExprResult 5384Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5385 CXXConstructorDecl *Constructor, bool Elidable, 5386 MultiExprArg ExprArgs, 5387 bool RequiresZeroInit, 5388 unsigned ConstructKind, 5389 SourceRange ParenRange) { 5390 unsigned NumExprs = ExprArgs.size(); 5391 Expr **Exprs = (Expr **)ExprArgs.release(); 5392 5393 MarkDeclarationReferenced(ConstructLoc, Constructor); 5394 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5395 Constructor, Elidable, Exprs, NumExprs, 5396 RequiresZeroInit, 5397 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5398 ParenRange)); 5399} 5400 5401bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5402 CXXConstructorDecl *Constructor, 5403 MultiExprArg Exprs) { 5404 // FIXME: Provide the correct paren SourceRange when available. 5405 ExprResult TempResult = 5406 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5407 move(Exprs), false, CXXConstructExpr::CK_Complete, 5408 SourceRange()); 5409 if (TempResult.isInvalid()) 5410 return true; 5411 5412 Expr *Temp = TempResult.takeAs<Expr>(); 5413 CheckImplicitConversions(Temp, VD->getLocation()); 5414 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5415 Temp = MaybeCreateExprWithCleanups(Temp); 5416 VD->setInit(Temp); 5417 5418 return false; 5419} 5420 5421void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5422 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5423 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5424 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5425 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5426 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5427 CheckDestructorAccess(VD->getLocation(), Destructor, 5428 PDiag(diag::err_access_dtor_var) 5429 << VD->getDeclName() 5430 << VD->getType()); 5431 5432 // TODO: this should be re-enabled for static locals by !CXAAtExit 5433 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 5434 Diag(VD->getLocation(), diag::warn_global_destructor); 5435 } 5436} 5437 5438/// AddCXXDirectInitializerToDecl - This action is called immediately after 5439/// ActOnDeclarator, when a C++ direct initializer is present. 5440/// e.g: "int x(1);" 5441void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5442 SourceLocation LParenLoc, 5443 MultiExprArg Exprs, 5444 SourceLocation RParenLoc) { 5445 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5446 5447 // If there is no declaration, there was an error parsing it. Just ignore 5448 // the initializer. 5449 if (RealDecl == 0) 5450 return; 5451 5452 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5453 if (!VDecl) { 5454 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5455 RealDecl->setInvalidDecl(); 5456 return; 5457 } 5458 5459 // We will represent direct-initialization similarly to copy-initialization: 5460 // int x(1); -as-> int x = 1; 5461 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5462 // 5463 // Clients that want to distinguish between the two forms, can check for 5464 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5465 // A major benefit is that clients that don't particularly care about which 5466 // exactly form was it (like the CodeGen) can handle both cases without 5467 // special case code. 5468 5469 // C++ 8.5p11: 5470 // The form of initialization (using parentheses or '=') is generally 5471 // insignificant, but does matter when the entity being initialized has a 5472 // class type. 5473 5474 if (!VDecl->getType()->isDependentType() && 5475 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5476 diag::err_typecheck_decl_incomplete_type)) { 5477 VDecl->setInvalidDecl(); 5478 return; 5479 } 5480 5481 // The variable can not have an abstract class type. 5482 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5483 diag::err_abstract_type_in_decl, 5484 AbstractVariableType)) 5485 VDecl->setInvalidDecl(); 5486 5487 const VarDecl *Def; 5488 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5489 Diag(VDecl->getLocation(), diag::err_redefinition) 5490 << VDecl->getDeclName(); 5491 Diag(Def->getLocation(), diag::note_previous_definition); 5492 VDecl->setInvalidDecl(); 5493 return; 5494 } 5495 5496 // C++ [class.static.data]p4 5497 // If a static data member is of const integral or const 5498 // enumeration type, its declaration in the class definition can 5499 // specify a constant-initializer which shall be an integral 5500 // constant expression (5.19). In that case, the member can appear 5501 // in integral constant expressions. The member shall still be 5502 // defined in a namespace scope if it is used in the program and the 5503 // namespace scope definition shall not contain an initializer. 5504 // 5505 // We already performed a redefinition check above, but for static 5506 // data members we also need to check whether there was an in-class 5507 // declaration with an initializer. 5508 const VarDecl* PrevInit = 0; 5509 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5510 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5511 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5512 return; 5513 } 5514 5515 // If either the declaration has a dependent type or if any of the 5516 // expressions is type-dependent, we represent the initialization 5517 // via a ParenListExpr for later use during template instantiation. 5518 if (VDecl->getType()->isDependentType() || 5519 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5520 // Let clients know that initialization was done with a direct initializer. 5521 VDecl->setCXXDirectInitializer(true); 5522 5523 // Store the initialization expressions as a ParenListExpr. 5524 unsigned NumExprs = Exprs.size(); 5525 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5526 (Expr **)Exprs.release(), 5527 NumExprs, RParenLoc)); 5528 return; 5529 } 5530 5531 // Capture the variable that is being initialized and the style of 5532 // initialization. 5533 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5534 5535 // FIXME: Poor source location information. 5536 InitializationKind Kind 5537 = InitializationKind::CreateDirect(VDecl->getLocation(), 5538 LParenLoc, RParenLoc); 5539 5540 InitializationSequence InitSeq(*this, Entity, Kind, 5541 Exprs.get(), Exprs.size()); 5542 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5543 if (Result.isInvalid()) { 5544 VDecl->setInvalidDecl(); 5545 return; 5546 } 5547 5548 CheckImplicitConversions(Result.get(), LParenLoc); 5549 5550 Result = MaybeCreateExprWithCleanups(Result); 5551 VDecl->setInit(Result.takeAs<Expr>()); 5552 VDecl->setCXXDirectInitializer(true); 5553 5554 if (!VDecl->isInvalidDecl() && 5555 !VDecl->getDeclContext()->isDependentContext() && 5556 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 5557 !VDecl->getInit()->isConstantInitializer(Context, 5558 VDecl->getType()->isReferenceType())) 5559 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5560 << VDecl->getInit()->getSourceRange(); 5561 5562 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5563 FinalizeVarWithDestructor(VDecl, Record); 5564} 5565 5566/// \brief Given a constructor and the set of arguments provided for the 5567/// constructor, convert the arguments and add any required default arguments 5568/// to form a proper call to this constructor. 5569/// 5570/// \returns true if an error occurred, false otherwise. 5571bool 5572Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5573 MultiExprArg ArgsPtr, 5574 SourceLocation Loc, 5575 ASTOwningVector<Expr*> &ConvertedArgs) { 5576 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5577 unsigned NumArgs = ArgsPtr.size(); 5578 Expr **Args = (Expr **)ArgsPtr.get(); 5579 5580 const FunctionProtoType *Proto 5581 = Constructor->getType()->getAs<FunctionProtoType>(); 5582 assert(Proto && "Constructor without a prototype?"); 5583 unsigned NumArgsInProto = Proto->getNumArgs(); 5584 5585 // If too few arguments are available, we'll fill in the rest with defaults. 5586 if (NumArgs < NumArgsInProto) 5587 ConvertedArgs.reserve(NumArgsInProto); 5588 else 5589 ConvertedArgs.reserve(NumArgs); 5590 5591 VariadicCallType CallType = 5592 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5593 llvm::SmallVector<Expr *, 8> AllArgs; 5594 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5595 Proto, 0, Args, NumArgs, AllArgs, 5596 CallType); 5597 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5598 ConvertedArgs.push_back(AllArgs[i]); 5599 return Invalid; 5600} 5601 5602static inline bool 5603CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5604 const FunctionDecl *FnDecl) { 5605 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5606 if (isa<NamespaceDecl>(DC)) { 5607 return SemaRef.Diag(FnDecl->getLocation(), 5608 diag::err_operator_new_delete_declared_in_namespace) 5609 << FnDecl->getDeclName(); 5610 } 5611 5612 if (isa<TranslationUnitDecl>(DC) && 5613 FnDecl->getStorageClass() == SC_Static) { 5614 return SemaRef.Diag(FnDecl->getLocation(), 5615 diag::err_operator_new_delete_declared_static) 5616 << FnDecl->getDeclName(); 5617 } 5618 5619 return false; 5620} 5621 5622static inline bool 5623CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5624 CanQualType ExpectedResultType, 5625 CanQualType ExpectedFirstParamType, 5626 unsigned DependentParamTypeDiag, 5627 unsigned InvalidParamTypeDiag) { 5628 QualType ResultType = 5629 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5630 5631 // Check that the result type is not dependent. 5632 if (ResultType->isDependentType()) 5633 return SemaRef.Diag(FnDecl->getLocation(), 5634 diag::err_operator_new_delete_dependent_result_type) 5635 << FnDecl->getDeclName() << ExpectedResultType; 5636 5637 // Check that the result type is what we expect. 5638 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5639 return SemaRef.Diag(FnDecl->getLocation(), 5640 diag::err_operator_new_delete_invalid_result_type) 5641 << FnDecl->getDeclName() << ExpectedResultType; 5642 5643 // A function template must have at least 2 parameters. 5644 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5645 return SemaRef.Diag(FnDecl->getLocation(), 5646 diag::err_operator_new_delete_template_too_few_parameters) 5647 << FnDecl->getDeclName(); 5648 5649 // The function decl must have at least 1 parameter. 5650 if (FnDecl->getNumParams() == 0) 5651 return SemaRef.Diag(FnDecl->getLocation(), 5652 diag::err_operator_new_delete_too_few_parameters) 5653 << FnDecl->getDeclName(); 5654 5655 // Check the the first parameter type is not dependent. 5656 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5657 if (FirstParamType->isDependentType()) 5658 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5659 << FnDecl->getDeclName() << ExpectedFirstParamType; 5660 5661 // Check that the first parameter type is what we expect. 5662 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5663 ExpectedFirstParamType) 5664 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5665 << FnDecl->getDeclName() << ExpectedFirstParamType; 5666 5667 return false; 5668} 5669 5670static bool 5671CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5672 // C++ [basic.stc.dynamic.allocation]p1: 5673 // A program is ill-formed if an allocation function is declared in a 5674 // namespace scope other than global scope or declared static in global 5675 // scope. 5676 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5677 return true; 5678 5679 CanQualType SizeTy = 5680 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5681 5682 // C++ [basic.stc.dynamic.allocation]p1: 5683 // The return type shall be void*. The first parameter shall have type 5684 // std::size_t. 5685 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5686 SizeTy, 5687 diag::err_operator_new_dependent_param_type, 5688 diag::err_operator_new_param_type)) 5689 return true; 5690 5691 // C++ [basic.stc.dynamic.allocation]p1: 5692 // The first parameter shall not have an associated default argument. 5693 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5694 return SemaRef.Diag(FnDecl->getLocation(), 5695 diag::err_operator_new_default_arg) 5696 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5697 5698 return false; 5699} 5700 5701static bool 5702CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5703 // C++ [basic.stc.dynamic.deallocation]p1: 5704 // A program is ill-formed if deallocation functions are declared in a 5705 // namespace scope other than global scope or declared static in global 5706 // scope. 5707 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5708 return true; 5709 5710 // C++ [basic.stc.dynamic.deallocation]p2: 5711 // Each deallocation function shall return void and its first parameter 5712 // shall be void*. 5713 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5714 SemaRef.Context.VoidPtrTy, 5715 diag::err_operator_delete_dependent_param_type, 5716 diag::err_operator_delete_param_type)) 5717 return true; 5718 5719 return false; 5720} 5721 5722/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5723/// of this overloaded operator is well-formed. If so, returns false; 5724/// otherwise, emits appropriate diagnostics and returns true. 5725bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5726 assert(FnDecl && FnDecl->isOverloadedOperator() && 5727 "Expected an overloaded operator declaration"); 5728 5729 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5730 5731 // C++ [over.oper]p5: 5732 // The allocation and deallocation functions, operator new, 5733 // operator new[], operator delete and operator delete[], are 5734 // described completely in 3.7.3. The attributes and restrictions 5735 // found in the rest of this subclause do not apply to them unless 5736 // explicitly stated in 3.7.3. 5737 if (Op == OO_Delete || Op == OO_Array_Delete) 5738 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5739 5740 if (Op == OO_New || Op == OO_Array_New) 5741 return CheckOperatorNewDeclaration(*this, FnDecl); 5742 5743 // C++ [over.oper]p6: 5744 // An operator function shall either be a non-static member 5745 // function or be a non-member function and have at least one 5746 // parameter whose type is a class, a reference to a class, an 5747 // enumeration, or a reference to an enumeration. 5748 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5749 if (MethodDecl->isStatic()) 5750 return Diag(FnDecl->getLocation(), 5751 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5752 } else { 5753 bool ClassOrEnumParam = false; 5754 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5755 ParamEnd = FnDecl->param_end(); 5756 Param != ParamEnd; ++Param) { 5757 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5758 if (ParamType->isDependentType() || ParamType->isRecordType() || 5759 ParamType->isEnumeralType()) { 5760 ClassOrEnumParam = true; 5761 break; 5762 } 5763 } 5764 5765 if (!ClassOrEnumParam) 5766 return Diag(FnDecl->getLocation(), 5767 diag::err_operator_overload_needs_class_or_enum) 5768 << FnDecl->getDeclName(); 5769 } 5770 5771 // C++ [over.oper]p8: 5772 // An operator function cannot have default arguments (8.3.6), 5773 // except where explicitly stated below. 5774 // 5775 // Only the function-call operator allows default arguments 5776 // (C++ [over.call]p1). 5777 if (Op != OO_Call) { 5778 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5779 Param != FnDecl->param_end(); ++Param) { 5780 if ((*Param)->hasDefaultArg()) 5781 return Diag((*Param)->getLocation(), 5782 diag::err_operator_overload_default_arg) 5783 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5784 } 5785 } 5786 5787 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5788 { false, false, false } 5789#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5790 , { Unary, Binary, MemberOnly } 5791#include "clang/Basic/OperatorKinds.def" 5792 }; 5793 5794 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5795 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5796 bool MustBeMemberOperator = OperatorUses[Op][2]; 5797 5798 // C++ [over.oper]p8: 5799 // [...] Operator functions cannot have more or fewer parameters 5800 // than the number required for the corresponding operator, as 5801 // described in the rest of this subclause. 5802 unsigned NumParams = FnDecl->getNumParams() 5803 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5804 if (Op != OO_Call && 5805 ((NumParams == 1 && !CanBeUnaryOperator) || 5806 (NumParams == 2 && !CanBeBinaryOperator) || 5807 (NumParams < 1) || (NumParams > 2))) { 5808 // We have the wrong number of parameters. 5809 unsigned ErrorKind; 5810 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5811 ErrorKind = 2; // 2 -> unary or binary. 5812 } else if (CanBeUnaryOperator) { 5813 ErrorKind = 0; // 0 -> unary 5814 } else { 5815 assert(CanBeBinaryOperator && 5816 "All non-call overloaded operators are unary or binary!"); 5817 ErrorKind = 1; // 1 -> binary 5818 } 5819 5820 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5821 << FnDecl->getDeclName() << NumParams << ErrorKind; 5822 } 5823 5824 // Overloaded operators other than operator() cannot be variadic. 5825 if (Op != OO_Call && 5826 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5827 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5828 << FnDecl->getDeclName(); 5829 } 5830 5831 // Some operators must be non-static member functions. 5832 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5833 return Diag(FnDecl->getLocation(), 5834 diag::err_operator_overload_must_be_member) 5835 << FnDecl->getDeclName(); 5836 } 5837 5838 // C++ [over.inc]p1: 5839 // The user-defined function called operator++ implements the 5840 // prefix and postfix ++ operator. If this function is a member 5841 // function with no parameters, or a non-member function with one 5842 // parameter of class or enumeration type, it defines the prefix 5843 // increment operator ++ for objects of that type. If the function 5844 // is a member function with one parameter (which shall be of type 5845 // int) or a non-member function with two parameters (the second 5846 // of which shall be of type int), it defines the postfix 5847 // increment operator ++ for objects of that type. 5848 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5849 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5850 bool ParamIsInt = false; 5851 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5852 ParamIsInt = BT->getKind() == BuiltinType::Int; 5853 5854 if (!ParamIsInt) 5855 return Diag(LastParam->getLocation(), 5856 diag::err_operator_overload_post_incdec_must_be_int) 5857 << LastParam->getType() << (Op == OO_MinusMinus); 5858 } 5859 5860 return false; 5861} 5862 5863/// CheckLiteralOperatorDeclaration - Check whether the declaration 5864/// of this literal operator function is well-formed. If so, returns 5865/// false; otherwise, emits appropriate diagnostics and returns true. 5866bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5867 DeclContext *DC = FnDecl->getDeclContext(); 5868 Decl::Kind Kind = DC->getDeclKind(); 5869 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5870 Kind != Decl::LinkageSpec) { 5871 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5872 << FnDecl->getDeclName(); 5873 return true; 5874 } 5875 5876 bool Valid = false; 5877 5878 // template <char...> type operator "" name() is the only valid template 5879 // signature, and the only valid signature with no parameters. 5880 if (FnDecl->param_size() == 0) { 5881 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5882 // Must have only one template parameter 5883 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5884 if (Params->size() == 1) { 5885 NonTypeTemplateParmDecl *PmDecl = 5886 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5887 5888 // The template parameter must be a char parameter pack. 5889 // FIXME: This test will always fail because non-type parameter packs 5890 // have not been implemented. 5891 if (PmDecl && PmDecl->isTemplateParameterPack() && 5892 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5893 Valid = true; 5894 } 5895 } 5896 } else { 5897 // Check the first parameter 5898 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5899 5900 QualType T = (*Param)->getType(); 5901 5902 // unsigned long long int, long double, and any character type are allowed 5903 // as the only parameters. 5904 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5905 Context.hasSameType(T, Context.LongDoubleTy) || 5906 Context.hasSameType(T, Context.CharTy) || 5907 Context.hasSameType(T, Context.WCharTy) || 5908 Context.hasSameType(T, Context.Char16Ty) || 5909 Context.hasSameType(T, Context.Char32Ty)) { 5910 if (++Param == FnDecl->param_end()) 5911 Valid = true; 5912 goto FinishedParams; 5913 } 5914 5915 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5916 const PointerType *PT = T->getAs<PointerType>(); 5917 if (!PT) 5918 goto FinishedParams; 5919 T = PT->getPointeeType(); 5920 if (!T.isConstQualified()) 5921 goto FinishedParams; 5922 T = T.getUnqualifiedType(); 5923 5924 // Move on to the second parameter; 5925 ++Param; 5926 5927 // If there is no second parameter, the first must be a const char * 5928 if (Param == FnDecl->param_end()) { 5929 if (Context.hasSameType(T, Context.CharTy)) 5930 Valid = true; 5931 goto FinishedParams; 5932 } 5933 5934 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5935 // are allowed as the first parameter to a two-parameter function 5936 if (!(Context.hasSameType(T, Context.CharTy) || 5937 Context.hasSameType(T, Context.WCharTy) || 5938 Context.hasSameType(T, Context.Char16Ty) || 5939 Context.hasSameType(T, Context.Char32Ty))) 5940 goto FinishedParams; 5941 5942 // The second and final parameter must be an std::size_t 5943 T = (*Param)->getType().getUnqualifiedType(); 5944 if (Context.hasSameType(T, Context.getSizeType()) && 5945 ++Param == FnDecl->param_end()) 5946 Valid = true; 5947 } 5948 5949 // FIXME: This diagnostic is absolutely terrible. 5950FinishedParams: 5951 if (!Valid) { 5952 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5953 << FnDecl->getDeclName(); 5954 return true; 5955 } 5956 5957 return false; 5958} 5959 5960/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5961/// linkage specification, including the language and (if present) 5962/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5963/// the location of the language string literal, which is provided 5964/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5965/// the '{' brace. Otherwise, this linkage specification does not 5966/// have any braces. 5967Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 5968 SourceLocation LangLoc, 5969 llvm::StringRef Lang, 5970 SourceLocation LBraceLoc) { 5971 LinkageSpecDecl::LanguageIDs Language; 5972 if (Lang == "\"C\"") 5973 Language = LinkageSpecDecl::lang_c; 5974 else if (Lang == "\"C++\"") 5975 Language = LinkageSpecDecl::lang_cxx; 5976 else { 5977 Diag(LangLoc, diag::err_bad_language); 5978 return 0; 5979 } 5980 5981 // FIXME: Add all the various semantics of linkage specifications 5982 5983 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5984 LangLoc, Language, 5985 LBraceLoc.isValid()); 5986 CurContext->addDecl(D); 5987 PushDeclContext(S, D); 5988 return D; 5989} 5990 5991/// ActOnFinishLinkageSpecification - Complete the definition of 5992/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5993/// valid, it's the position of the closing '}' brace in a linkage 5994/// specification that uses braces. 5995Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 5996 Decl *LinkageSpec, 5997 SourceLocation RBraceLoc) { 5998 if (LinkageSpec) 5999 PopDeclContext(); 6000 return LinkageSpec; 6001} 6002 6003/// \brief Perform semantic analysis for the variable declaration that 6004/// occurs within a C++ catch clause, returning the newly-created 6005/// variable. 6006VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6007 TypeSourceInfo *TInfo, 6008 IdentifierInfo *Name, 6009 SourceLocation Loc) { 6010 bool Invalid = false; 6011 QualType ExDeclType = TInfo->getType(); 6012 6013 // Arrays and functions decay. 6014 if (ExDeclType->isArrayType()) 6015 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6016 else if (ExDeclType->isFunctionType()) 6017 ExDeclType = Context.getPointerType(ExDeclType); 6018 6019 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6020 // The exception-declaration shall not denote a pointer or reference to an 6021 // incomplete type, other than [cv] void*. 6022 // N2844 forbids rvalue references. 6023 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6024 Diag(Loc, diag::err_catch_rvalue_ref); 6025 Invalid = true; 6026 } 6027 6028 // GCC allows catching pointers and references to incomplete types 6029 // as an extension; so do we, but we warn by default. 6030 6031 QualType BaseType = ExDeclType; 6032 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6033 unsigned DK = diag::err_catch_incomplete; 6034 bool IncompleteCatchIsInvalid = true; 6035 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6036 BaseType = Ptr->getPointeeType(); 6037 Mode = 1; 6038 DK = diag::ext_catch_incomplete_ptr; 6039 IncompleteCatchIsInvalid = false; 6040 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6041 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6042 BaseType = Ref->getPointeeType(); 6043 Mode = 2; 6044 DK = diag::ext_catch_incomplete_ref; 6045 IncompleteCatchIsInvalid = false; 6046 } 6047 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6048 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6049 IncompleteCatchIsInvalid) 6050 Invalid = true; 6051 6052 if (!Invalid && !ExDeclType->isDependentType() && 6053 RequireNonAbstractType(Loc, ExDeclType, 6054 diag::err_abstract_type_in_decl, 6055 AbstractVariableType)) 6056 Invalid = true; 6057 6058 // Only the non-fragile NeXT runtime currently supports C++ catches 6059 // of ObjC types, and no runtime supports catching ObjC types by value. 6060 if (!Invalid && getLangOptions().ObjC1) { 6061 QualType T = ExDeclType; 6062 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6063 T = RT->getPointeeType(); 6064 6065 if (T->isObjCObjectType()) { 6066 Diag(Loc, diag::err_objc_object_catch); 6067 Invalid = true; 6068 } else if (T->isObjCObjectPointerType()) { 6069 if (!getLangOptions().NeXTRuntime) { 6070 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6071 Invalid = true; 6072 } else if (!getLangOptions().ObjCNonFragileABI) { 6073 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6074 Invalid = true; 6075 } 6076 } 6077 } 6078 6079 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6080 Name, ExDeclType, TInfo, SC_None, 6081 SC_None); 6082 ExDecl->setExceptionVariable(true); 6083 6084 if (!Invalid) { 6085 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6086 // C++ [except.handle]p16: 6087 // The object declared in an exception-declaration or, if the 6088 // exception-declaration does not specify a name, a temporary (12.2) is 6089 // copy-initialized (8.5) from the exception object. [...] 6090 // The object is destroyed when the handler exits, after the destruction 6091 // of any automatic objects initialized within the handler. 6092 // 6093 // We just pretend to initialize the object with itself, then make sure 6094 // it can be destroyed later. 6095 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6096 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6097 Loc, ExDeclType, VK_LValue, 0); 6098 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6099 SourceLocation()); 6100 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6101 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6102 MultiExprArg(*this, &ExDeclRef, 1)); 6103 if (Result.isInvalid()) 6104 Invalid = true; 6105 else 6106 FinalizeVarWithDestructor(ExDecl, RecordTy); 6107 } 6108 } 6109 6110 if (Invalid) 6111 ExDecl->setInvalidDecl(); 6112 6113 return ExDecl; 6114} 6115 6116/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6117/// handler. 6118Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6119 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6120 QualType ExDeclType = TInfo->getType(); 6121 6122 bool Invalid = D.isInvalidType(); 6123 IdentifierInfo *II = D.getIdentifier(); 6124 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6125 LookupOrdinaryName, 6126 ForRedeclaration)) { 6127 // The scope should be freshly made just for us. There is just no way 6128 // it contains any previous declaration. 6129 assert(!S->isDeclScope(PrevDecl)); 6130 if (PrevDecl->isTemplateParameter()) { 6131 // Maybe we will complain about the shadowed template parameter. 6132 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6133 } 6134 } 6135 6136 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6137 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6138 << D.getCXXScopeSpec().getRange(); 6139 Invalid = true; 6140 } 6141 6142 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6143 D.getIdentifier(), 6144 D.getIdentifierLoc()); 6145 6146 if (Invalid) 6147 ExDecl->setInvalidDecl(); 6148 6149 // Add the exception declaration into this scope. 6150 if (II) 6151 PushOnScopeChains(ExDecl, S); 6152 else 6153 CurContext->addDecl(ExDecl); 6154 6155 ProcessDeclAttributes(S, ExDecl, D); 6156 return ExDecl; 6157} 6158 6159Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6160 Expr *AssertExpr, 6161 Expr *AssertMessageExpr_) { 6162 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6163 6164 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6165 llvm::APSInt Value(32); 6166 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6167 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6168 AssertExpr->getSourceRange(); 6169 return 0; 6170 } 6171 6172 if (Value == 0) { 6173 Diag(AssertLoc, diag::err_static_assert_failed) 6174 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6175 } 6176 } 6177 6178 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6179 AssertExpr, AssertMessage); 6180 6181 CurContext->addDecl(Decl); 6182 return Decl; 6183} 6184 6185/// \brief Perform semantic analysis of the given friend type declaration. 6186/// 6187/// \returns A friend declaration that. 6188FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6189 TypeSourceInfo *TSInfo) { 6190 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6191 6192 QualType T = TSInfo->getType(); 6193 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6194 6195 if (!getLangOptions().CPlusPlus0x) { 6196 // C++03 [class.friend]p2: 6197 // An elaborated-type-specifier shall be used in a friend declaration 6198 // for a class.* 6199 // 6200 // * The class-key of the elaborated-type-specifier is required. 6201 if (!ActiveTemplateInstantiations.empty()) { 6202 // Do not complain about the form of friend template types during 6203 // template instantiation; we will already have complained when the 6204 // template was declared. 6205 } else if (!T->isElaboratedTypeSpecifier()) { 6206 // If we evaluated the type to a record type, suggest putting 6207 // a tag in front. 6208 if (const RecordType *RT = T->getAs<RecordType>()) { 6209 RecordDecl *RD = RT->getDecl(); 6210 6211 std::string InsertionText = std::string(" ") + RD->getKindName(); 6212 6213 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6214 << (unsigned) RD->getTagKind() 6215 << T 6216 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6217 InsertionText); 6218 } else { 6219 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6220 << T 6221 << SourceRange(FriendLoc, TypeRange.getEnd()); 6222 } 6223 } else if (T->getAs<EnumType>()) { 6224 Diag(FriendLoc, diag::ext_enum_friend) 6225 << T 6226 << SourceRange(FriendLoc, TypeRange.getEnd()); 6227 } 6228 } 6229 6230 // C++0x [class.friend]p3: 6231 // If the type specifier in a friend declaration designates a (possibly 6232 // cv-qualified) class type, that class is declared as a friend; otherwise, 6233 // the friend declaration is ignored. 6234 6235 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6236 // in [class.friend]p3 that we do not implement. 6237 6238 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6239} 6240 6241/// Handle a friend tag declaration where the scope specifier was 6242/// templated. 6243Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6244 unsigned TagSpec, SourceLocation TagLoc, 6245 CXXScopeSpec &SS, 6246 IdentifierInfo *Name, SourceLocation NameLoc, 6247 AttributeList *Attr, 6248 MultiTemplateParamsArg TempParamLists) { 6249 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6250 6251 bool isExplicitSpecialization = false; 6252 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6253 bool Invalid = false; 6254 6255 if (TemplateParameterList *TemplateParams 6256 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6257 TempParamLists.get(), 6258 TempParamLists.size(), 6259 /*friend*/ true, 6260 isExplicitSpecialization, 6261 Invalid)) { 6262 --NumMatchedTemplateParamLists; 6263 6264 if (TemplateParams->size() > 0) { 6265 // This is a declaration of a class template. 6266 if (Invalid) 6267 return 0; 6268 6269 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6270 SS, Name, NameLoc, Attr, 6271 TemplateParams, AS_public).take(); 6272 } else { 6273 // The "template<>" header is extraneous. 6274 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6275 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6276 isExplicitSpecialization = true; 6277 } 6278 } 6279 6280 if (Invalid) return 0; 6281 6282 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6283 6284 bool isAllExplicitSpecializations = true; 6285 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6286 if (TempParamLists.get()[I]->size()) { 6287 isAllExplicitSpecializations = false; 6288 break; 6289 } 6290 } 6291 6292 // FIXME: don't ignore attributes. 6293 6294 // If it's explicit specializations all the way down, just forget 6295 // about the template header and build an appropriate non-templated 6296 // friend. TODO: for source fidelity, remember the headers. 6297 if (isAllExplicitSpecializations) { 6298 ElaboratedTypeKeyword Keyword 6299 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6300 QualType T = CheckTypenameType(Keyword, SS.getScopeRep(), *Name, 6301 TagLoc, SS.getRange(), NameLoc); 6302 if (T.isNull()) 6303 return 0; 6304 6305 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6306 if (isa<DependentNameType>(T)) { 6307 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6308 TL.setKeywordLoc(TagLoc); 6309 TL.setQualifierRange(SS.getRange()); 6310 TL.setNameLoc(NameLoc); 6311 } else { 6312 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6313 TL.setKeywordLoc(TagLoc); 6314 TL.setQualifierRange(SS.getRange()); 6315 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6316 } 6317 6318 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6319 TSI, FriendLoc); 6320 Friend->setAccess(AS_public); 6321 CurContext->addDecl(Friend); 6322 return Friend; 6323 } 6324 6325 // Handle the case of a templated-scope friend class. e.g. 6326 // template <class T> class A<T>::B; 6327 // FIXME: we don't support these right now. 6328 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6329 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6330 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6331 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6332 TL.setKeywordLoc(TagLoc); 6333 TL.setQualifierRange(SS.getRange()); 6334 TL.setNameLoc(NameLoc); 6335 6336 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6337 TSI, FriendLoc); 6338 Friend->setAccess(AS_public); 6339 Friend->setUnsupportedFriend(true); 6340 CurContext->addDecl(Friend); 6341 return Friend; 6342} 6343 6344 6345/// Handle a friend type declaration. This works in tandem with 6346/// ActOnTag. 6347/// 6348/// Notes on friend class templates: 6349/// 6350/// We generally treat friend class declarations as if they were 6351/// declaring a class. So, for example, the elaborated type specifier 6352/// in a friend declaration is required to obey the restrictions of a 6353/// class-head (i.e. no typedefs in the scope chain), template 6354/// parameters are required to match up with simple template-ids, &c. 6355/// However, unlike when declaring a template specialization, it's 6356/// okay to refer to a template specialization without an empty 6357/// template parameter declaration, e.g. 6358/// friend class A<T>::B<unsigned>; 6359/// We permit this as a special case; if there are any template 6360/// parameters present at all, require proper matching, i.e. 6361/// template <> template <class T> friend class A<int>::B; 6362Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6363 MultiTemplateParamsArg TempParams) { 6364 SourceLocation Loc = DS.getSourceRange().getBegin(); 6365 6366 assert(DS.isFriendSpecified()); 6367 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6368 6369 // Try to convert the decl specifier to a type. This works for 6370 // friend templates because ActOnTag never produces a ClassTemplateDecl 6371 // for a TUK_Friend. 6372 Declarator TheDeclarator(DS, Declarator::MemberContext); 6373 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6374 QualType T = TSI->getType(); 6375 if (TheDeclarator.isInvalidType()) 6376 return 0; 6377 6378 // This is definitely an error in C++98. It's probably meant to 6379 // be forbidden in C++0x, too, but the specification is just 6380 // poorly written. 6381 // 6382 // The problem is with declarations like the following: 6383 // template <T> friend A<T>::foo; 6384 // where deciding whether a class C is a friend or not now hinges 6385 // on whether there exists an instantiation of A that causes 6386 // 'foo' to equal C. There are restrictions on class-heads 6387 // (which we declare (by fiat) elaborated friend declarations to 6388 // be) that makes this tractable. 6389 // 6390 // FIXME: handle "template <> friend class A<T>;", which 6391 // is possibly well-formed? Who even knows? 6392 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6393 Diag(Loc, diag::err_tagless_friend_type_template) 6394 << DS.getSourceRange(); 6395 return 0; 6396 } 6397 6398 // C++98 [class.friend]p1: A friend of a class is a function 6399 // or class that is not a member of the class . . . 6400 // This is fixed in DR77, which just barely didn't make the C++03 6401 // deadline. It's also a very silly restriction that seriously 6402 // affects inner classes and which nobody else seems to implement; 6403 // thus we never diagnose it, not even in -pedantic. 6404 // 6405 // But note that we could warn about it: it's always useless to 6406 // friend one of your own members (it's not, however, worthless to 6407 // friend a member of an arbitrary specialization of your template). 6408 6409 Decl *D; 6410 if (unsigned NumTempParamLists = TempParams.size()) 6411 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6412 NumTempParamLists, 6413 TempParams.release(), 6414 TSI, 6415 DS.getFriendSpecLoc()); 6416 else 6417 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6418 6419 if (!D) 6420 return 0; 6421 6422 D->setAccess(AS_public); 6423 CurContext->addDecl(D); 6424 6425 return D; 6426} 6427 6428Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 6429 MultiTemplateParamsArg TemplateParams) { 6430 const DeclSpec &DS = D.getDeclSpec(); 6431 6432 assert(DS.isFriendSpecified()); 6433 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6434 6435 SourceLocation Loc = D.getIdentifierLoc(); 6436 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6437 QualType T = TInfo->getType(); 6438 6439 // C++ [class.friend]p1 6440 // A friend of a class is a function or class.... 6441 // Note that this sees through typedefs, which is intended. 6442 // It *doesn't* see through dependent types, which is correct 6443 // according to [temp.arg.type]p3: 6444 // If a declaration acquires a function type through a 6445 // type dependent on a template-parameter and this causes 6446 // a declaration that does not use the syntactic form of a 6447 // function declarator to have a function type, the program 6448 // is ill-formed. 6449 if (!T->isFunctionType()) { 6450 Diag(Loc, diag::err_unexpected_friend); 6451 6452 // It might be worthwhile to try to recover by creating an 6453 // appropriate declaration. 6454 return 0; 6455 } 6456 6457 // C++ [namespace.memdef]p3 6458 // - If a friend declaration in a non-local class first declares a 6459 // class or function, the friend class or function is a member 6460 // of the innermost enclosing namespace. 6461 // - The name of the friend is not found by simple name lookup 6462 // until a matching declaration is provided in that namespace 6463 // scope (either before or after the class declaration granting 6464 // friendship). 6465 // - If a friend function is called, its name may be found by the 6466 // name lookup that considers functions from namespaces and 6467 // classes associated with the types of the function arguments. 6468 // - When looking for a prior declaration of a class or a function 6469 // declared as a friend, scopes outside the innermost enclosing 6470 // namespace scope are not considered. 6471 6472 CXXScopeSpec &SS = D.getCXXScopeSpec(); 6473 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6474 DeclarationName Name = NameInfo.getName(); 6475 assert(Name); 6476 6477 // The context we found the declaration in, or in which we should 6478 // create the declaration. 6479 DeclContext *DC; 6480 Scope *DCScope = S; 6481 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6482 ForRedeclaration); 6483 6484 // FIXME: there are different rules in local classes 6485 6486 // There are four cases here. 6487 // - There's no scope specifier, in which case we just go to the 6488 // appropriate scope and look for a function or function template 6489 // there as appropriate. 6490 // Recover from invalid scope qualifiers as if they just weren't there. 6491 if (SS.isInvalid() || !SS.isSet()) { 6492 // C++0x [namespace.memdef]p3: 6493 // If the name in a friend declaration is neither qualified nor 6494 // a template-id and the declaration is a function or an 6495 // elaborated-type-specifier, the lookup to determine whether 6496 // the entity has been previously declared shall not consider 6497 // any scopes outside the innermost enclosing namespace. 6498 // C++0x [class.friend]p11: 6499 // If a friend declaration appears in a local class and the name 6500 // specified is an unqualified name, a prior declaration is 6501 // looked up without considering scopes that are outside the 6502 // innermost enclosing non-class scope. For a friend function 6503 // declaration, if there is no prior declaration, the program is 6504 // ill-formed. 6505 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 6506 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 6507 6508 // Find the appropriate context according to the above. 6509 DC = CurContext; 6510 while (true) { 6511 // Skip class contexts. If someone can cite chapter and verse 6512 // for this behavior, that would be nice --- it's what GCC and 6513 // EDG do, and it seems like a reasonable intent, but the spec 6514 // really only says that checks for unqualified existing 6515 // declarations should stop at the nearest enclosing namespace, 6516 // not that they should only consider the nearest enclosing 6517 // namespace. 6518 while (DC->isRecord()) 6519 DC = DC->getParent(); 6520 6521 LookupQualifiedName(Previous, DC); 6522 6523 // TODO: decide what we think about using declarations. 6524 if (isLocal || !Previous.empty()) 6525 break; 6526 6527 if (isTemplateId) { 6528 if (isa<TranslationUnitDecl>(DC)) break; 6529 } else { 6530 if (DC->isFileContext()) break; 6531 } 6532 DC = DC->getParent(); 6533 } 6534 6535 // C++ [class.friend]p1: A friend of a class is a function or 6536 // class that is not a member of the class . . . 6537 // C++0x changes this for both friend types and functions. 6538 // Most C++ 98 compilers do seem to give an error here, so 6539 // we do, too. 6540 if (!Previous.empty() && DC->Equals(CurContext) 6541 && !getLangOptions().CPlusPlus0x) 6542 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6543 6544 DCScope = getScopeForDeclContext(S, DC); 6545 6546 // - There's a non-dependent scope specifier, in which case we 6547 // compute it and do a previous lookup there for a function 6548 // or function template. 6549 } else if (!SS.getScopeRep()->isDependent()) { 6550 DC = computeDeclContext(SS); 6551 if (!DC) return 0; 6552 6553 if (RequireCompleteDeclContext(SS, DC)) return 0; 6554 6555 LookupQualifiedName(Previous, DC); 6556 6557 // Ignore things found implicitly in the wrong scope. 6558 // TODO: better diagnostics for this case. Suggesting the right 6559 // qualified scope would be nice... 6560 LookupResult::Filter F = Previous.makeFilter(); 6561 while (F.hasNext()) { 6562 NamedDecl *D = F.next(); 6563 if (!DC->InEnclosingNamespaceSetOf( 6564 D->getDeclContext()->getRedeclContext())) 6565 F.erase(); 6566 } 6567 F.done(); 6568 6569 if (Previous.empty()) { 6570 D.setInvalidType(); 6571 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6572 return 0; 6573 } 6574 6575 // C++ [class.friend]p1: A friend of a class is a function or 6576 // class that is not a member of the class . . . 6577 if (DC->Equals(CurContext)) 6578 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6579 6580 // - There's a scope specifier that does not match any template 6581 // parameter lists, in which case we use some arbitrary context, 6582 // create a method or method template, and wait for instantiation. 6583 // - There's a scope specifier that does match some template 6584 // parameter lists, which we don't handle right now. 6585 } else { 6586 DC = CurContext; 6587 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 6588 } 6589 6590 if (!DC->isRecord()) { 6591 // This implies that it has to be an operator or function. 6592 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6593 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6594 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6595 Diag(Loc, diag::err_introducing_special_friend) << 6596 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6597 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6598 return 0; 6599 } 6600 } 6601 6602 bool Redeclaration = false; 6603 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 6604 move(TemplateParams), 6605 IsDefinition, 6606 Redeclaration); 6607 if (!ND) return 0; 6608 6609 assert(ND->getDeclContext() == DC); 6610 assert(ND->getLexicalDeclContext() == CurContext); 6611 6612 // Add the function declaration to the appropriate lookup tables, 6613 // adjusting the redeclarations list as necessary. We don't 6614 // want to do this yet if the friending class is dependent. 6615 // 6616 // Also update the scope-based lookup if the target context's 6617 // lookup context is in lexical scope. 6618 if (!CurContext->isDependentContext()) { 6619 DC = DC->getRedeclContext(); 6620 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6621 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6622 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6623 } 6624 6625 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6626 D.getIdentifierLoc(), ND, 6627 DS.getFriendSpecLoc()); 6628 FrD->setAccess(AS_public); 6629 CurContext->addDecl(FrD); 6630 6631 if (ND->isInvalidDecl()) 6632 FrD->setInvalidDecl(); 6633 else { 6634 FunctionDecl *FD; 6635 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 6636 FD = FTD->getTemplatedDecl(); 6637 else 6638 FD = cast<FunctionDecl>(ND); 6639 6640 // Mark templated-scope function declarations as unsupported. 6641 if (FD->getNumTemplateParameterLists()) 6642 FrD->setUnsupportedFriend(true); 6643 } 6644 6645 return ND; 6646} 6647 6648void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6649 AdjustDeclIfTemplate(Dcl); 6650 6651 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6652 if (!Fn) { 6653 Diag(DelLoc, diag::err_deleted_non_function); 6654 return; 6655 } 6656 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6657 Diag(DelLoc, diag::err_deleted_decl_not_first); 6658 Diag(Prev->getLocation(), diag::note_previous_declaration); 6659 // If the declaration wasn't the first, we delete the function anyway for 6660 // recovery. 6661 } 6662 Fn->setDeleted(); 6663} 6664 6665static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6666 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6667 ++CI) { 6668 Stmt *SubStmt = *CI; 6669 if (!SubStmt) 6670 continue; 6671 if (isa<ReturnStmt>(SubStmt)) 6672 Self.Diag(SubStmt->getSourceRange().getBegin(), 6673 diag::err_return_in_constructor_handler); 6674 if (!isa<Expr>(SubStmt)) 6675 SearchForReturnInStmt(Self, SubStmt); 6676 } 6677} 6678 6679void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6680 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6681 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6682 SearchForReturnInStmt(*this, Handler); 6683 } 6684} 6685 6686bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6687 const CXXMethodDecl *Old) { 6688 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6689 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6690 6691 if (Context.hasSameType(NewTy, OldTy) || 6692 NewTy->isDependentType() || OldTy->isDependentType()) 6693 return false; 6694 6695 // Check if the return types are covariant 6696 QualType NewClassTy, OldClassTy; 6697 6698 /// Both types must be pointers or references to classes. 6699 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6700 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6701 NewClassTy = NewPT->getPointeeType(); 6702 OldClassTy = OldPT->getPointeeType(); 6703 } 6704 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6705 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6706 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6707 NewClassTy = NewRT->getPointeeType(); 6708 OldClassTy = OldRT->getPointeeType(); 6709 } 6710 } 6711 } 6712 6713 // The return types aren't either both pointers or references to a class type. 6714 if (NewClassTy.isNull()) { 6715 Diag(New->getLocation(), 6716 diag::err_different_return_type_for_overriding_virtual_function) 6717 << New->getDeclName() << NewTy << OldTy; 6718 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6719 6720 return true; 6721 } 6722 6723 // C++ [class.virtual]p6: 6724 // If the return type of D::f differs from the return type of B::f, the 6725 // class type in the return type of D::f shall be complete at the point of 6726 // declaration of D::f or shall be the class type D. 6727 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6728 if (!RT->isBeingDefined() && 6729 RequireCompleteType(New->getLocation(), NewClassTy, 6730 PDiag(diag::err_covariant_return_incomplete) 6731 << New->getDeclName())) 6732 return true; 6733 } 6734 6735 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6736 // Check if the new class derives from the old class. 6737 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6738 Diag(New->getLocation(), 6739 diag::err_covariant_return_not_derived) 6740 << New->getDeclName() << NewTy << OldTy; 6741 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6742 return true; 6743 } 6744 6745 // Check if we the conversion from derived to base is valid. 6746 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6747 diag::err_covariant_return_inaccessible_base, 6748 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6749 // FIXME: Should this point to the return type? 6750 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6751 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6752 return true; 6753 } 6754 } 6755 6756 // The qualifiers of the return types must be the same. 6757 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6758 Diag(New->getLocation(), 6759 diag::err_covariant_return_type_different_qualifications) 6760 << New->getDeclName() << NewTy << OldTy; 6761 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6762 return true; 6763 }; 6764 6765 6766 // The new class type must have the same or less qualifiers as the old type. 6767 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6768 Diag(New->getLocation(), 6769 diag::err_covariant_return_type_class_type_more_qualified) 6770 << New->getDeclName() << NewTy << OldTy; 6771 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6772 return true; 6773 }; 6774 6775 return false; 6776} 6777 6778bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6779 const CXXMethodDecl *Old) 6780{ 6781 if (Old->hasAttr<FinalAttr>()) { 6782 Diag(New->getLocation(), diag::err_final_function_overridden) 6783 << New->getDeclName(); 6784 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6785 return true; 6786 } 6787 6788 return false; 6789} 6790 6791/// \brief Mark the given method pure. 6792/// 6793/// \param Method the method to be marked pure. 6794/// 6795/// \param InitRange the source range that covers the "0" initializer. 6796bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6797 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6798 Method->setPure(); 6799 return false; 6800 } 6801 6802 if (!Method->isInvalidDecl()) 6803 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6804 << Method->getDeclName() << InitRange; 6805 return true; 6806} 6807 6808/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6809/// an initializer for the out-of-line declaration 'Dcl'. The scope 6810/// is a fresh scope pushed for just this purpose. 6811/// 6812/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6813/// static data member of class X, names should be looked up in the scope of 6814/// class X. 6815void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6816 // If there is no declaration, there was an error parsing it. 6817 if (D == 0) return; 6818 6819 // We should only get called for declarations with scope specifiers, like: 6820 // int foo::bar; 6821 assert(D->isOutOfLine()); 6822 EnterDeclaratorContext(S, D->getDeclContext()); 6823} 6824 6825/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6826/// initializer for the out-of-line declaration 'D'. 6827void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6828 // If there is no declaration, there was an error parsing it. 6829 if (D == 0) return; 6830 6831 assert(D->isOutOfLine()); 6832 ExitDeclaratorContext(S); 6833} 6834 6835/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6836/// C++ if/switch/while/for statement. 6837/// e.g: "if (int x = f()) {...}" 6838DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6839 // C++ 6.4p2: 6840 // The declarator shall not specify a function or an array. 6841 // The type-specifier-seq shall not contain typedef and shall not declare a 6842 // new class or enumeration. 6843 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6844 "Parser allowed 'typedef' as storage class of condition decl."); 6845 6846 TagDecl *OwnedTag = 0; 6847 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6848 QualType Ty = TInfo->getType(); 6849 6850 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6851 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6852 // would be created and CXXConditionDeclExpr wants a VarDecl. 6853 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6854 << D.getSourceRange(); 6855 return DeclResult(); 6856 } else if (OwnedTag && OwnedTag->isDefinition()) { 6857 // The type-specifier-seq shall not declare a new class or enumeration. 6858 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6859 } 6860 6861 Decl *Dcl = ActOnDeclarator(S, D); 6862 if (!Dcl) 6863 return DeclResult(); 6864 6865 return Dcl; 6866} 6867 6868void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6869 bool DefinitionRequired) { 6870 // Ignore any vtable uses in unevaluated operands or for classes that do 6871 // not have a vtable. 6872 if (!Class->isDynamicClass() || Class->isDependentContext() || 6873 CurContext->isDependentContext() || 6874 ExprEvalContexts.back().Context == Unevaluated) 6875 return; 6876 6877 // Try to insert this class into the map. 6878 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6879 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6880 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6881 if (!Pos.second) { 6882 // If we already had an entry, check to see if we are promoting this vtable 6883 // to required a definition. If so, we need to reappend to the VTableUses 6884 // list, since we may have already processed the first entry. 6885 if (DefinitionRequired && !Pos.first->second) { 6886 Pos.first->second = true; 6887 } else { 6888 // Otherwise, we can early exit. 6889 return; 6890 } 6891 } 6892 6893 // Local classes need to have their virtual members marked 6894 // immediately. For all other classes, we mark their virtual members 6895 // at the end of the translation unit. 6896 if (Class->isLocalClass()) 6897 MarkVirtualMembersReferenced(Loc, Class); 6898 else 6899 VTableUses.push_back(std::make_pair(Class, Loc)); 6900} 6901 6902bool Sema::DefineUsedVTables() { 6903 if (VTableUses.empty()) 6904 return false; 6905 6906 // Note: The VTableUses vector could grow as a result of marking 6907 // the members of a class as "used", so we check the size each 6908 // time through the loop and prefer indices (with are stable) to 6909 // iterators (which are not). 6910 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6911 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6912 if (!Class) 6913 continue; 6914 6915 SourceLocation Loc = VTableUses[I].second; 6916 6917 // If this class has a key function, but that key function is 6918 // defined in another translation unit, we don't need to emit the 6919 // vtable even though we're using it. 6920 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6921 if (KeyFunction && !KeyFunction->hasBody()) { 6922 switch (KeyFunction->getTemplateSpecializationKind()) { 6923 case TSK_Undeclared: 6924 case TSK_ExplicitSpecialization: 6925 case TSK_ExplicitInstantiationDeclaration: 6926 // The key function is in another translation unit. 6927 continue; 6928 6929 case TSK_ExplicitInstantiationDefinition: 6930 case TSK_ImplicitInstantiation: 6931 // We will be instantiating the key function. 6932 break; 6933 } 6934 } else if (!KeyFunction) { 6935 // If we have a class with no key function that is the subject 6936 // of an explicit instantiation declaration, suppress the 6937 // vtable; it will live with the explicit instantiation 6938 // definition. 6939 bool IsExplicitInstantiationDeclaration 6940 = Class->getTemplateSpecializationKind() 6941 == TSK_ExplicitInstantiationDeclaration; 6942 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6943 REnd = Class->redecls_end(); 6944 R != REnd; ++R) { 6945 TemplateSpecializationKind TSK 6946 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6947 if (TSK == TSK_ExplicitInstantiationDeclaration) 6948 IsExplicitInstantiationDeclaration = true; 6949 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6950 IsExplicitInstantiationDeclaration = false; 6951 break; 6952 } 6953 } 6954 6955 if (IsExplicitInstantiationDeclaration) 6956 continue; 6957 } 6958 6959 // Mark all of the virtual members of this class as referenced, so 6960 // that we can build a vtable. Then, tell the AST consumer that a 6961 // vtable for this class is required. 6962 MarkVirtualMembersReferenced(Loc, Class); 6963 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6964 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6965 6966 // Optionally warn if we're emitting a weak vtable. 6967 if (Class->getLinkage() == ExternalLinkage && 6968 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6969 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6970 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6971 } 6972 } 6973 VTableUses.clear(); 6974 6975 return true; 6976} 6977 6978void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6979 const CXXRecordDecl *RD) { 6980 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6981 e = RD->method_end(); i != e; ++i) { 6982 CXXMethodDecl *MD = *i; 6983 6984 // C++ [basic.def.odr]p2: 6985 // [...] A virtual member function is used if it is not pure. [...] 6986 if (MD->isVirtual() && !MD->isPure()) 6987 MarkDeclarationReferenced(Loc, MD); 6988 } 6989 6990 // Only classes that have virtual bases need a VTT. 6991 if (RD->getNumVBases() == 0) 6992 return; 6993 6994 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6995 e = RD->bases_end(); i != e; ++i) { 6996 const CXXRecordDecl *Base = 6997 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6998 if (Base->getNumVBases() == 0) 6999 continue; 7000 MarkVirtualMembersReferenced(Loc, Base); 7001 } 7002} 7003 7004/// SetIvarInitializers - This routine builds initialization ASTs for the 7005/// Objective-C implementation whose ivars need be initialized. 7006void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7007 if (!getLangOptions().CPlusPlus) 7008 return; 7009 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7010 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7011 CollectIvarsToConstructOrDestruct(OID, ivars); 7012 if (ivars.empty()) 7013 return; 7014 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 7015 for (unsigned i = 0; i < ivars.size(); i++) { 7016 FieldDecl *Field = ivars[i]; 7017 if (Field->isInvalidDecl()) 7018 continue; 7019 7020 CXXBaseOrMemberInitializer *Member; 7021 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7022 InitializationKind InitKind = 7023 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7024 7025 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7026 ExprResult MemberInit = 7027 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7028 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7029 // Note, MemberInit could actually come back empty if no initialization 7030 // is required (e.g., because it would call a trivial default constructor) 7031 if (!MemberInit.get() || MemberInit.isInvalid()) 7032 continue; 7033 7034 Member = 7035 new (Context) CXXBaseOrMemberInitializer(Context, 7036 Field, SourceLocation(), 7037 SourceLocation(), 7038 MemberInit.takeAs<Expr>(), 7039 SourceLocation()); 7040 AllToInit.push_back(Member); 7041 7042 // Be sure that the destructor is accessible and is marked as referenced. 7043 if (const RecordType *RecordTy 7044 = Context.getBaseElementType(Field->getType()) 7045 ->getAs<RecordType>()) { 7046 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7047 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7048 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7049 CheckDestructorAccess(Field->getLocation(), Destructor, 7050 PDiag(diag::err_access_dtor_ivar) 7051 << Context.getBaseElementType(Field->getType())); 7052 } 7053 } 7054 } 7055 ObjCImplementation->setIvarInitializers(Context, 7056 AllToInit.data(), AllToInit.size()); 7057 } 7058} 7059