SemaDeclCXX.cpp revision acba90f30876b4140b738f0d3dd0e50724053a96
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/ExprCXX.h" 25#include "clang/AST/RecordLayout.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Basic/PartialDiagnostic.h" 32#include "clang/Lex/Preprocessor.h" 33#include "llvm/ADT/DenseSet.h" 34#include "llvm/ADT/STLExtras.h" 35#include <map> 36#include <set> 37 38using namespace clang; 39 40//===----------------------------------------------------------------------===// 41// CheckDefaultArgumentVisitor 42//===----------------------------------------------------------------------===// 43 44namespace { 45 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 46 /// the default argument of a parameter to determine whether it 47 /// contains any ill-formed subexpressions. For example, this will 48 /// diagnose the use of local variables or parameters within the 49 /// default argument expression. 50 class CheckDefaultArgumentVisitor 51 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 52 Expr *DefaultArg; 53 Sema *S; 54 55 public: 56 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 57 : DefaultArg(defarg), S(s) {} 58 59 bool VisitExpr(Expr *Node); 60 bool VisitDeclRefExpr(DeclRefExpr *DRE); 61 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 62 }; 63 64 /// VisitExpr - Visit all of the children of this expression. 65 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 66 bool IsInvalid = false; 67 for (Stmt::child_range I = Node->children(); I; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isLocalVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 129 Param); 130 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 131 EqualLoc); 132 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 133 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 134 MultiExprArg(*this, &Arg, 1)); 135 if (Result.isInvalid()) 136 return true; 137 Arg = Result.takeAs<Expr>(); 138 139 CheckImplicitConversions(Arg, EqualLoc); 140 Arg = MaybeCreateExprWithCleanups(Arg); 141 142 // Okay: add the default argument to the parameter 143 Param->setDefaultArg(Arg); 144 145 // We have already instantiated this parameter; provide each of the 146 // instantiations with the uninstantiated default argument. 147 UnparsedDefaultArgInstantiationsMap::iterator InstPos 148 = UnparsedDefaultArgInstantiations.find(Param); 149 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 150 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 151 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 152 153 // We're done tracking this parameter's instantiations. 154 UnparsedDefaultArgInstantiations.erase(InstPos); 155 } 156 157 return false; 158} 159 160/// ActOnParamDefaultArgument - Check whether the default argument 161/// provided for a function parameter is well-formed. If so, attach it 162/// to the parameter declaration. 163void 164Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 165 Expr *DefaultArg) { 166 if (!param || !DefaultArg) 167 return; 168 169 ParmVarDecl *Param = cast<ParmVarDecl>(param); 170 UnparsedDefaultArgLocs.erase(Param); 171 172 // Default arguments are only permitted in C++ 173 if (!getLangOptions().CPlusPlus) { 174 Diag(EqualLoc, diag::err_param_default_argument) 175 << DefaultArg->getSourceRange(); 176 Param->setInvalidDecl(); 177 return; 178 } 179 180 // Check for unexpanded parameter packs. 181 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 182 Param->setInvalidDecl(); 183 return; 184 } 185 186 // Check that the default argument is well-formed 187 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 188 if (DefaultArgChecker.Visit(DefaultArg)) { 189 Param->setInvalidDecl(); 190 return; 191 } 192 193 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 194} 195 196/// ActOnParamUnparsedDefaultArgument - We've seen a default 197/// argument for a function parameter, but we can't parse it yet 198/// because we're inside a class definition. Note that this default 199/// argument will be parsed later. 200void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 201 SourceLocation EqualLoc, 202 SourceLocation ArgLoc) { 203 if (!param) 204 return; 205 206 ParmVarDecl *Param = cast<ParmVarDecl>(param); 207 if (Param) 208 Param->setUnparsedDefaultArg(); 209 210 UnparsedDefaultArgLocs[Param] = ArgLoc; 211} 212 213/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 214/// the default argument for the parameter param failed. 215void Sema::ActOnParamDefaultArgumentError(Decl *param) { 216 if (!param) 217 return; 218 219 ParmVarDecl *Param = cast<ParmVarDecl>(param); 220 221 Param->setInvalidDecl(); 222 223 UnparsedDefaultArgLocs.erase(Param); 224} 225 226/// CheckExtraCXXDefaultArguments - Check for any extra default 227/// arguments in the declarator, which is not a function declaration 228/// or definition and therefore is not permitted to have default 229/// arguments. This routine should be invoked for every declarator 230/// that is not a function declaration or definition. 231void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 232 // C++ [dcl.fct.default]p3 233 // A default argument expression shall be specified only in the 234 // parameter-declaration-clause of a function declaration or in a 235 // template-parameter (14.1). It shall not be specified for a 236 // parameter pack. If it is specified in a 237 // parameter-declaration-clause, it shall not occur within a 238 // declarator or abstract-declarator of a parameter-declaration. 239 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 240 DeclaratorChunk &chunk = D.getTypeObject(i); 241 if (chunk.Kind == DeclaratorChunk::Function) { 242 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 243 ParmVarDecl *Param = 244 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 245 if (Param->hasUnparsedDefaultArg()) { 246 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 247 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 248 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 249 delete Toks; 250 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 251 } else if (Param->getDefaultArg()) { 252 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 253 << Param->getDefaultArg()->getSourceRange(); 254 Param->setDefaultArg(0); 255 } 256 } 257 } 258 } 259} 260 261// MergeCXXFunctionDecl - Merge two declarations of the same C++ 262// function, once we already know that they have the same 263// type. Subroutine of MergeFunctionDecl. Returns true if there was an 264// error, false otherwise. 265bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 266 bool Invalid = false; 267 268 // C++ [dcl.fct.default]p4: 269 // For non-template functions, default arguments can be added in 270 // later declarations of a function in the same 271 // scope. Declarations in different scopes have completely 272 // distinct sets of default arguments. That is, declarations in 273 // inner scopes do not acquire default arguments from 274 // declarations in outer scopes, and vice versa. In a given 275 // function declaration, all parameters subsequent to a 276 // parameter with a default argument shall have default 277 // arguments supplied in this or previous declarations. A 278 // default argument shall not be redefined by a later 279 // declaration (not even to the same value). 280 // 281 // C++ [dcl.fct.default]p6: 282 // Except for member functions of class templates, the default arguments 283 // in a member function definition that appears outside of the class 284 // definition are added to the set of default arguments provided by the 285 // member function declaration in the class definition. 286 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 287 ParmVarDecl *OldParam = Old->getParamDecl(p); 288 ParmVarDecl *NewParam = New->getParamDecl(p); 289 290 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 291 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 292 // hint here. Alternatively, we could walk the type-source information 293 // for NewParam to find the last source location in the type... but it 294 // isn't worth the effort right now. This is the kind of test case that 295 // is hard to get right: 296 297 // int f(int); 298 // void g(int (*fp)(int) = f); 299 // void g(int (*fp)(int) = &f); 300 Diag(NewParam->getLocation(), 301 diag::err_param_default_argument_redefinition) 302 << NewParam->getDefaultArgRange(); 303 304 // Look for the function declaration where the default argument was 305 // actually written, which may be a declaration prior to Old. 306 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 307 Older; Older = Older->getPreviousDeclaration()) { 308 if (!Older->getParamDecl(p)->hasDefaultArg()) 309 break; 310 311 OldParam = Older->getParamDecl(p); 312 } 313 314 Diag(OldParam->getLocation(), diag::note_previous_definition) 315 << OldParam->getDefaultArgRange(); 316 Invalid = true; 317 } else if (OldParam->hasDefaultArg()) { 318 // Merge the old default argument into the new parameter. 319 // It's important to use getInit() here; getDefaultArg() 320 // strips off any top-level ExprWithCleanups. 321 NewParam->setHasInheritedDefaultArg(); 322 if (OldParam->hasUninstantiatedDefaultArg()) 323 NewParam->setUninstantiatedDefaultArg( 324 OldParam->getUninstantiatedDefaultArg()); 325 else 326 NewParam->setDefaultArg(OldParam->getInit()); 327 } else if (NewParam->hasDefaultArg()) { 328 if (New->getDescribedFunctionTemplate()) { 329 // Paragraph 4, quoted above, only applies to non-template functions. 330 Diag(NewParam->getLocation(), 331 diag::err_param_default_argument_template_redecl) 332 << NewParam->getDefaultArgRange(); 333 Diag(Old->getLocation(), diag::note_template_prev_declaration) 334 << false; 335 } else if (New->getTemplateSpecializationKind() 336 != TSK_ImplicitInstantiation && 337 New->getTemplateSpecializationKind() != TSK_Undeclared) { 338 // C++ [temp.expr.spec]p21: 339 // Default function arguments shall not be specified in a declaration 340 // or a definition for one of the following explicit specializations: 341 // - the explicit specialization of a function template; 342 // - the explicit specialization of a member function template; 343 // - the explicit specialization of a member function of a class 344 // template where the class template specialization to which the 345 // member function specialization belongs is implicitly 346 // instantiated. 347 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 348 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 349 << New->getDeclName() 350 << NewParam->getDefaultArgRange(); 351 } else if (New->getDeclContext()->isDependentContext()) { 352 // C++ [dcl.fct.default]p6 (DR217): 353 // Default arguments for a member function of a class template shall 354 // be specified on the initial declaration of the member function 355 // within the class template. 356 // 357 // Reading the tea leaves a bit in DR217 and its reference to DR205 358 // leads me to the conclusion that one cannot add default function 359 // arguments for an out-of-line definition of a member function of a 360 // dependent type. 361 int WhichKind = 2; 362 if (CXXRecordDecl *Record 363 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 364 if (Record->getDescribedClassTemplate()) 365 WhichKind = 0; 366 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 367 WhichKind = 1; 368 else 369 WhichKind = 2; 370 } 371 372 Diag(NewParam->getLocation(), 373 diag::err_param_default_argument_member_template_redecl) 374 << WhichKind 375 << NewParam->getDefaultArgRange(); 376 } 377 } 378 } 379 380 if (CheckEquivalentExceptionSpec(Old, New)) 381 Invalid = true; 382 383 return Invalid; 384} 385 386/// CheckCXXDefaultArguments - Verify that the default arguments for a 387/// function declaration are well-formed according to C++ 388/// [dcl.fct.default]. 389void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 390 unsigned NumParams = FD->getNumParams(); 391 unsigned p; 392 393 // Find first parameter with a default argument 394 for (p = 0; p < NumParams; ++p) { 395 ParmVarDecl *Param = FD->getParamDecl(p); 396 if (Param->hasDefaultArg()) 397 break; 398 } 399 400 // C++ [dcl.fct.default]p4: 401 // In a given function declaration, all parameters 402 // subsequent to a parameter with a default argument shall 403 // have default arguments supplied in this or previous 404 // declarations. A default argument shall not be redefined 405 // by a later declaration (not even to the same value). 406 unsigned LastMissingDefaultArg = 0; 407 for (; p < NumParams; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (!Param->hasDefaultArg()) { 410 if (Param->isInvalidDecl()) 411 /* We already complained about this parameter. */; 412 else if (Param->getIdentifier()) 413 Diag(Param->getLocation(), 414 diag::err_param_default_argument_missing_name) 415 << Param->getIdentifier(); 416 else 417 Diag(Param->getLocation(), 418 diag::err_param_default_argument_missing); 419 420 LastMissingDefaultArg = p; 421 } 422 } 423 424 if (LastMissingDefaultArg > 0) { 425 // Some default arguments were missing. Clear out all of the 426 // default arguments up to (and including) the last missing 427 // default argument, so that we leave the function parameters 428 // in a semantically valid state. 429 for (p = 0; p <= LastMissingDefaultArg; ++p) { 430 ParmVarDecl *Param = FD->getParamDecl(p); 431 if (Param->hasDefaultArg()) { 432 Param->setDefaultArg(0); 433 } 434 } 435 } 436} 437 438/// isCurrentClassName - Determine whether the identifier II is the 439/// name of the class type currently being defined. In the case of 440/// nested classes, this will only return true if II is the name of 441/// the innermost class. 442bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 443 const CXXScopeSpec *SS) { 444 assert(getLangOptions().CPlusPlus && "No class names in C!"); 445 446 CXXRecordDecl *CurDecl; 447 if (SS && SS->isSet() && !SS->isInvalid()) { 448 DeclContext *DC = computeDeclContext(*SS, true); 449 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 450 } else 451 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 452 453 if (CurDecl && CurDecl->getIdentifier()) 454 return &II == CurDecl->getIdentifier(); 455 else 456 return false; 457} 458 459/// \brief Check the validity of a C++ base class specifier. 460/// 461/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 462/// and returns NULL otherwise. 463CXXBaseSpecifier * 464Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 465 SourceRange SpecifierRange, 466 bool Virtual, AccessSpecifier Access, 467 TypeSourceInfo *TInfo, 468 SourceLocation EllipsisLoc) { 469 QualType BaseType = TInfo->getType(); 470 471 // C++ [class.union]p1: 472 // A union shall not have base classes. 473 if (Class->isUnion()) { 474 Diag(Class->getLocation(), diag::err_base_clause_on_union) 475 << SpecifierRange; 476 return 0; 477 } 478 479 if (EllipsisLoc.isValid() && 480 !TInfo->getType()->containsUnexpandedParameterPack()) { 481 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 482 << TInfo->getTypeLoc().getSourceRange(); 483 EllipsisLoc = SourceLocation(); 484 } 485 486 if (BaseType->isDependentType()) 487 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 488 Class->getTagKind() == TTK_Class, 489 Access, TInfo, EllipsisLoc); 490 491 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 492 493 // Base specifiers must be record types. 494 if (!BaseType->isRecordType()) { 495 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 496 return 0; 497 } 498 499 // C++ [class.union]p1: 500 // A union shall not be used as a base class. 501 if (BaseType->isUnionType()) { 502 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 503 return 0; 504 } 505 506 // C++ [class.derived]p2: 507 // The class-name in a base-specifier shall not be an incompletely 508 // defined class. 509 if (RequireCompleteType(BaseLoc, BaseType, 510 PDiag(diag::err_incomplete_base_class) 511 << SpecifierRange)) { 512 Class->setInvalidDecl(); 513 return 0; 514 } 515 516 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 517 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 518 assert(BaseDecl && "Record type has no declaration"); 519 BaseDecl = BaseDecl->getDefinition(); 520 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 521 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 522 assert(CXXBaseDecl && "Base type is not a C++ type"); 523 524 // C++ [class.derived]p2: 525 // If a class is marked with the class-virt-specifier final and it appears 526 // as a base-type-specifier in a base-clause (10 class.derived), the program 527 // is ill-formed. 528 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 529 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 530 << CXXBaseDecl->getDeclName(); 531 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 532 << CXXBaseDecl->getDeclName(); 533 return 0; 534 } 535 536 if (BaseDecl->isInvalidDecl()) 537 Class->setInvalidDecl(); 538 539 // Create the base specifier. 540 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 541 Class->getTagKind() == TTK_Class, 542 Access, TInfo, EllipsisLoc); 543} 544 545/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 546/// one entry in the base class list of a class specifier, for 547/// example: 548/// class foo : public bar, virtual private baz { 549/// 'public bar' and 'virtual private baz' are each base-specifiers. 550BaseResult 551Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 552 bool Virtual, AccessSpecifier Access, 553 ParsedType basetype, SourceLocation BaseLoc, 554 SourceLocation EllipsisLoc) { 555 if (!classdecl) 556 return true; 557 558 AdjustDeclIfTemplate(classdecl); 559 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 560 if (!Class) 561 return true; 562 563 TypeSourceInfo *TInfo = 0; 564 GetTypeFromParser(basetype, &TInfo); 565 566 if (EllipsisLoc.isInvalid() && 567 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 568 UPPC_BaseType)) 569 return true; 570 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, TInfo, 573 EllipsisLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 if (!Class->hasObjectMember()) { 600 if (const RecordType *FDTTy = 601 NewBaseType.getTypePtr()->getAs<RecordType>()) 602 if (FDTTy->getDecl()->hasObjectMember()) 603 Class->setHasObjectMember(true); 604 } 605 606 if (KnownBaseTypes[NewBaseType]) { 607 // C++ [class.mi]p3: 608 // A class shall not be specified as a direct base class of a 609 // derived class more than once. 610 Diag(Bases[idx]->getSourceRange().getBegin(), 611 diag::err_duplicate_base_class) 612 << KnownBaseTypes[NewBaseType]->getType() 613 << Bases[idx]->getSourceRange(); 614 615 // Delete the duplicate base class specifier; we're going to 616 // overwrite its pointer later. 617 Context.Deallocate(Bases[idx]); 618 619 Invalid = true; 620 } else { 621 // Okay, add this new base class. 622 KnownBaseTypes[NewBaseType] = Bases[idx]; 623 Bases[NumGoodBases++] = Bases[idx]; 624 } 625 } 626 627 // Attach the remaining base class specifiers to the derived class. 628 Class->setBases(Bases, NumGoodBases); 629 630 // Delete the remaining (good) base class specifiers, since their 631 // data has been copied into the CXXRecordDecl. 632 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 633 Context.Deallocate(Bases[idx]); 634 635 return Invalid; 636} 637 638/// ActOnBaseSpecifiers - Attach the given base specifiers to the 639/// class, after checking whether there are any duplicate base 640/// classes. 641void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 642 unsigned NumBases) { 643 if (!ClassDecl || !Bases || !NumBases) 644 return; 645 646 AdjustDeclIfTemplate(ClassDecl); 647 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 648 (CXXBaseSpecifier**)(Bases), NumBases); 649} 650 651static CXXRecordDecl *GetClassForType(QualType T) { 652 if (const RecordType *RT = T->getAs<RecordType>()) 653 return cast<CXXRecordDecl>(RT->getDecl()); 654 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 655 return ICT->getDecl(); 656 else 657 return 0; 658} 659 660/// \brief Determine whether the type \p Derived is a C++ class that is 661/// derived from the type \p Base. 662bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 663 if (!getLangOptions().CPlusPlus) 664 return false; 665 666 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 667 if (!DerivedRD) 668 return false; 669 670 CXXRecordDecl *BaseRD = GetClassForType(Base); 671 if (!BaseRD) 672 return false; 673 674 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 675 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 return DerivedRD->isDerivedFrom(BaseRD, Paths); 693} 694 695void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 696 CXXCastPath &BasePathArray) { 697 assert(BasePathArray.empty() && "Base path array must be empty!"); 698 assert(Paths.isRecordingPaths() && "Must record paths!"); 699 700 const CXXBasePath &Path = Paths.front(); 701 702 // We first go backward and check if we have a virtual base. 703 // FIXME: It would be better if CXXBasePath had the base specifier for 704 // the nearest virtual base. 705 unsigned Start = 0; 706 for (unsigned I = Path.size(); I != 0; --I) { 707 if (Path[I - 1].Base->isVirtual()) { 708 Start = I - 1; 709 break; 710 } 711 } 712 713 // Now add all bases. 714 for (unsigned I = Start, E = Path.size(); I != E; ++I) 715 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 716} 717 718/// \brief Determine whether the given base path includes a virtual 719/// base class. 720bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 721 for (CXXCastPath::const_iterator B = BasePath.begin(), 722 BEnd = BasePath.end(); 723 B != BEnd; ++B) 724 if ((*B)->isVirtual()) 725 return true; 726 727 return false; 728} 729 730/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 731/// conversion (where Derived and Base are class types) is 732/// well-formed, meaning that the conversion is unambiguous (and 733/// that all of the base classes are accessible). Returns true 734/// and emits a diagnostic if the code is ill-formed, returns false 735/// otherwise. Loc is the location where this routine should point to 736/// if there is an error, and Range is the source range to highlight 737/// if there is an error. 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 unsigned InaccessibleBaseID, 741 unsigned AmbigiousBaseConvID, 742 SourceLocation Loc, SourceRange Range, 743 DeclarationName Name, 744 CXXCastPath *BasePath) { 745 // First, determine whether the path from Derived to Base is 746 // ambiguous. This is slightly more expensive than checking whether 747 // the Derived to Base conversion exists, because here we need to 748 // explore multiple paths to determine if there is an ambiguity. 749 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 750 /*DetectVirtual=*/false); 751 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 752 assert(DerivationOkay && 753 "Can only be used with a derived-to-base conversion"); 754 (void)DerivationOkay; 755 756 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 757 if (InaccessibleBaseID) { 758 // Check that the base class can be accessed. 759 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 760 InaccessibleBaseID)) { 761 case AR_inaccessible: 762 return true; 763 case AR_accessible: 764 case AR_dependent: 765 case AR_delayed: 766 break; 767 } 768 } 769 770 // Build a base path if necessary. 771 if (BasePath) 772 BuildBasePathArray(Paths, *BasePath); 773 return false; 774 } 775 776 // We know that the derived-to-base conversion is ambiguous, and 777 // we're going to produce a diagnostic. Perform the derived-to-base 778 // search just one more time to compute all of the possible paths so 779 // that we can print them out. This is more expensive than any of 780 // the previous derived-to-base checks we've done, but at this point 781 // performance isn't as much of an issue. 782 Paths.clear(); 783 Paths.setRecordingPaths(true); 784 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 785 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 786 (void)StillOkay; 787 788 // Build up a textual representation of the ambiguous paths, e.g., 789 // D -> B -> A, that will be used to illustrate the ambiguous 790 // conversions in the diagnostic. We only print one of the paths 791 // to each base class subobject. 792 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 793 794 Diag(Loc, AmbigiousBaseConvID) 795 << Derived << Base << PathDisplayStr << Range << Name; 796 return true; 797} 798 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 SourceLocation Loc, SourceRange Range, 802 CXXCastPath *BasePath, 803 bool IgnoreAccess) { 804 return CheckDerivedToBaseConversion(Derived, Base, 805 IgnoreAccess ? 0 806 : diag::err_upcast_to_inaccessible_base, 807 diag::err_ambiguous_derived_to_base_conv, 808 Loc, Range, DeclarationName(), 809 BasePath); 810} 811 812 813/// @brief Builds a string representing ambiguous paths from a 814/// specific derived class to different subobjects of the same base 815/// class. 816/// 817/// This function builds a string that can be used in error messages 818/// to show the different paths that one can take through the 819/// inheritance hierarchy to go from the derived class to different 820/// subobjects of a base class. The result looks something like this: 821/// @code 822/// struct D -> struct B -> struct A 823/// struct D -> struct C -> struct A 824/// @endcode 825std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 826 std::string PathDisplayStr; 827 std::set<unsigned> DisplayedPaths; 828 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 829 Path != Paths.end(); ++Path) { 830 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 831 // We haven't displayed a path to this particular base 832 // class subobject yet. 833 PathDisplayStr += "\n "; 834 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 835 for (CXXBasePath::const_iterator Element = Path->begin(); 836 Element != Path->end(); ++Element) 837 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 838 } 839 } 840 841 return PathDisplayStr; 842} 843 844//===----------------------------------------------------------------------===// 845// C++ class member Handling 846//===----------------------------------------------------------------------===// 847 848/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 849Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 850 SourceLocation ASLoc, 851 SourceLocation ColonLoc) { 852 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 853 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 854 ASLoc, ColonLoc); 855 CurContext->addHiddenDecl(ASDecl); 856 return ASDecl; 857} 858 859/// CheckOverrideControl - Check C++0x override control semantics. 860void Sema::CheckOverrideControl(const Decl *D) { 861 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 862 if (!MD || !MD->isVirtual()) 863 return; 864 865 if (MD->isDependentContext()) 866 return; 867 868 // C++0x [class.virtual]p3: 869 // If a virtual function is marked with the virt-specifier override and does 870 // not override a member function of a base class, 871 // the program is ill-formed. 872 bool HasOverriddenMethods = 873 MD->begin_overridden_methods() != MD->end_overridden_methods(); 874 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 875 Diag(MD->getLocation(), 876 diag::err_function_marked_override_not_overriding) 877 << MD->getDeclName(); 878 return; 879 } 880 881 // C++0x [class.derived]p8: 882 // In a class definition marked with the class-virt-specifier explicit, 883 // if a virtual member function that is neither implicitly-declared nor a 884 // destructor overrides a member function of a base class and it is not 885 // marked with the virt-specifier override, the program is ill-formed. 886 if (MD->getParent()->hasAttr<ExplicitAttr>() && !isa<CXXDestructorDecl>(MD) && 887 HasOverriddenMethods && !MD->hasAttr<OverrideAttr>()) { 888 llvm::SmallVector<const CXXMethodDecl*, 4> 889 OverriddenMethods(MD->begin_overridden_methods(), 890 MD->end_overridden_methods()); 891 892 Diag(MD->getLocation(), diag::err_function_overriding_without_override) 893 << MD->getDeclName() 894 << (unsigned)OverriddenMethods.size(); 895 896 for (unsigned I = 0; I != OverriddenMethods.size(); ++I) 897 Diag(OverriddenMethods[I]->getLocation(), 898 diag::note_overridden_virtual_function); 899 } 900} 901 902/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 903/// function overrides a virtual member function marked 'final', according to 904/// C++0x [class.virtual]p3. 905bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 906 const CXXMethodDecl *Old) { 907 if (!Old->hasAttr<FinalAttr>()) 908 return false; 909 910 Diag(New->getLocation(), diag::err_final_function_overridden) 911 << New->getDeclName(); 912 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 913 return true; 914} 915 916/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 917/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 918/// bitfield width if there is one and 'InitExpr' specifies the initializer if 919/// any. 920Decl * 921Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 922 MultiTemplateParamsArg TemplateParameterLists, 923 ExprTy *BW, const VirtSpecifiers &VS, 924 ExprTy *InitExpr, bool IsDefinition, 925 bool Deleted) { 926 const DeclSpec &DS = D.getDeclSpec(); 927 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 928 DeclarationName Name = NameInfo.getName(); 929 SourceLocation Loc = NameInfo.getLoc(); 930 931 // For anonymous bitfields, the location should point to the type. 932 if (Loc.isInvalid()) 933 Loc = D.getSourceRange().getBegin(); 934 935 Expr *BitWidth = static_cast<Expr*>(BW); 936 Expr *Init = static_cast<Expr*>(InitExpr); 937 938 assert(isa<CXXRecordDecl>(CurContext)); 939 assert(!DS.isFriendSpecified()); 940 941 bool isFunc = false; 942 if (D.isFunctionDeclarator()) 943 isFunc = true; 944 else if (D.getNumTypeObjects() == 0 && 945 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 946 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 947 isFunc = TDType->isFunctionType(); 948 } 949 950 // C++ 9.2p6: A member shall not be declared to have automatic storage 951 // duration (auto, register) or with the extern storage-class-specifier. 952 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 953 // data members and cannot be applied to names declared const or static, 954 // and cannot be applied to reference members. 955 switch (DS.getStorageClassSpec()) { 956 case DeclSpec::SCS_unspecified: 957 case DeclSpec::SCS_typedef: 958 case DeclSpec::SCS_static: 959 // FALL THROUGH. 960 break; 961 case DeclSpec::SCS_mutable: 962 if (isFunc) { 963 if (DS.getStorageClassSpecLoc().isValid()) 964 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 965 else 966 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 967 968 // FIXME: It would be nicer if the keyword was ignored only for this 969 // declarator. Otherwise we could get follow-up errors. 970 D.getMutableDeclSpec().ClearStorageClassSpecs(); 971 } 972 break; 973 default: 974 if (DS.getStorageClassSpecLoc().isValid()) 975 Diag(DS.getStorageClassSpecLoc(), 976 diag::err_storageclass_invalid_for_member); 977 else 978 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 979 D.getMutableDeclSpec().ClearStorageClassSpecs(); 980 } 981 982 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 983 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 984 !isFunc); 985 986 Decl *Member; 987 if (isInstField) { 988 CXXScopeSpec &SS = D.getCXXScopeSpec(); 989 990 991 if (SS.isSet() && !SS.isInvalid()) { 992 // The user provided a superfluous scope specifier inside a class 993 // definition: 994 // 995 // class X { 996 // int X::member; 997 // }; 998 DeclContext *DC = 0; 999 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1000 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1001 << Name << FixItHint::CreateRemoval(SS.getRange()); 1002 else 1003 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1004 << Name << SS.getRange(); 1005 1006 SS.clear(); 1007 } 1008 1009 // FIXME: Check for template parameters! 1010 // FIXME: Check that the name is an identifier! 1011 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1012 AS); 1013 assert(Member && "HandleField never returns null"); 1014 } else { 1015 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1016 if (!Member) { 1017 return 0; 1018 } 1019 1020 // Non-instance-fields can't have a bitfield. 1021 if (BitWidth) { 1022 if (Member->isInvalidDecl()) { 1023 // don't emit another diagnostic. 1024 } else if (isa<VarDecl>(Member)) { 1025 // C++ 9.6p3: A bit-field shall not be a static member. 1026 // "static member 'A' cannot be a bit-field" 1027 Diag(Loc, diag::err_static_not_bitfield) 1028 << Name << BitWidth->getSourceRange(); 1029 } else if (isa<TypedefDecl>(Member)) { 1030 // "typedef member 'x' cannot be a bit-field" 1031 Diag(Loc, diag::err_typedef_not_bitfield) 1032 << Name << BitWidth->getSourceRange(); 1033 } else { 1034 // A function typedef ("typedef int f(); f a;"). 1035 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1036 Diag(Loc, diag::err_not_integral_type_bitfield) 1037 << Name << cast<ValueDecl>(Member)->getType() 1038 << BitWidth->getSourceRange(); 1039 } 1040 1041 BitWidth = 0; 1042 Member->setInvalidDecl(); 1043 } 1044 1045 Member->setAccess(AS); 1046 1047 // If we have declared a member function template, set the access of the 1048 // templated declaration as well. 1049 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1050 FunTmpl->getTemplatedDecl()->setAccess(AS); 1051 } 1052 1053 if (VS.isOverrideSpecified()) { 1054 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1055 if (!MD || !MD->isVirtual()) { 1056 Diag(Member->getLocStart(), 1057 diag::override_keyword_only_allowed_on_virtual_member_functions) 1058 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1059 } else 1060 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1061 } 1062 if (VS.isFinalSpecified()) { 1063 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1064 if (!MD || !MD->isVirtual()) { 1065 Diag(Member->getLocStart(), 1066 diag::override_keyword_only_allowed_on_virtual_member_functions) 1067 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1068 } else 1069 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1070 } 1071 1072 CheckOverrideControl(Member); 1073 1074 assert((Name || isInstField) && "No identifier for non-field ?"); 1075 1076 if (Init) 1077 AddInitializerToDecl(Member, Init, false, 1078 DS.getTypeSpecType() == DeclSpec::TST_auto); 1079 if (Deleted) // FIXME: Source location is not very good. 1080 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1081 1082 FinalizeDeclaration(Member); 1083 1084 if (isInstField) 1085 FieldCollector->Add(cast<FieldDecl>(Member)); 1086 return Member; 1087} 1088 1089/// \brief Find the direct and/or virtual base specifiers that 1090/// correspond to the given base type, for use in base initialization 1091/// within a constructor. 1092static bool FindBaseInitializer(Sema &SemaRef, 1093 CXXRecordDecl *ClassDecl, 1094 QualType BaseType, 1095 const CXXBaseSpecifier *&DirectBaseSpec, 1096 const CXXBaseSpecifier *&VirtualBaseSpec) { 1097 // First, check for a direct base class. 1098 DirectBaseSpec = 0; 1099 for (CXXRecordDecl::base_class_const_iterator Base 1100 = ClassDecl->bases_begin(); 1101 Base != ClassDecl->bases_end(); ++Base) { 1102 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1103 // We found a direct base of this type. That's what we're 1104 // initializing. 1105 DirectBaseSpec = &*Base; 1106 break; 1107 } 1108 } 1109 1110 // Check for a virtual base class. 1111 // FIXME: We might be able to short-circuit this if we know in advance that 1112 // there are no virtual bases. 1113 VirtualBaseSpec = 0; 1114 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1115 // We haven't found a base yet; search the class hierarchy for a 1116 // virtual base class. 1117 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1118 /*DetectVirtual=*/false); 1119 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1120 BaseType, Paths)) { 1121 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1122 Path != Paths.end(); ++Path) { 1123 if (Path->back().Base->isVirtual()) { 1124 VirtualBaseSpec = Path->back().Base; 1125 break; 1126 } 1127 } 1128 } 1129 } 1130 1131 return DirectBaseSpec || VirtualBaseSpec; 1132} 1133 1134/// ActOnMemInitializer - Handle a C++ member initializer. 1135MemInitResult 1136Sema::ActOnMemInitializer(Decl *ConstructorD, 1137 Scope *S, 1138 CXXScopeSpec &SS, 1139 IdentifierInfo *MemberOrBase, 1140 ParsedType TemplateTypeTy, 1141 SourceLocation IdLoc, 1142 SourceLocation LParenLoc, 1143 ExprTy **Args, unsigned NumArgs, 1144 SourceLocation RParenLoc, 1145 SourceLocation EllipsisLoc) { 1146 if (!ConstructorD) 1147 return true; 1148 1149 AdjustDeclIfTemplate(ConstructorD); 1150 1151 CXXConstructorDecl *Constructor 1152 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1153 if (!Constructor) { 1154 // The user wrote a constructor initializer on a function that is 1155 // not a C++ constructor. Ignore the error for now, because we may 1156 // have more member initializers coming; we'll diagnose it just 1157 // once in ActOnMemInitializers. 1158 return true; 1159 } 1160 1161 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1162 1163 // C++ [class.base.init]p2: 1164 // Names in a mem-initializer-id are looked up in the scope of the 1165 // constructor's class and, if not found in that scope, are looked 1166 // up in the scope containing the constructor's definition. 1167 // [Note: if the constructor's class contains a member with the 1168 // same name as a direct or virtual base class of the class, a 1169 // mem-initializer-id naming the member or base class and composed 1170 // of a single identifier refers to the class member. A 1171 // mem-initializer-id for the hidden base class may be specified 1172 // using a qualified name. ] 1173 if (!SS.getScopeRep() && !TemplateTypeTy) { 1174 // Look for a member, first. 1175 FieldDecl *Member = 0; 1176 DeclContext::lookup_result Result 1177 = ClassDecl->lookup(MemberOrBase); 1178 if (Result.first != Result.second) { 1179 Member = dyn_cast<FieldDecl>(*Result.first); 1180 1181 if (Member) { 1182 if (EllipsisLoc.isValid()) 1183 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1184 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1185 1186 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1187 LParenLoc, RParenLoc); 1188 } 1189 1190 // Handle anonymous union case. 1191 if (IndirectFieldDecl* IndirectField 1192 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1193 if (EllipsisLoc.isValid()) 1194 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1195 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1196 1197 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1198 NumArgs, IdLoc, 1199 LParenLoc, RParenLoc); 1200 } 1201 } 1202 } 1203 // It didn't name a member, so see if it names a class. 1204 QualType BaseType; 1205 TypeSourceInfo *TInfo = 0; 1206 1207 if (TemplateTypeTy) { 1208 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1209 } else { 1210 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1211 LookupParsedName(R, S, &SS); 1212 1213 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1214 if (!TyD) { 1215 if (R.isAmbiguous()) return true; 1216 1217 // We don't want access-control diagnostics here. 1218 R.suppressDiagnostics(); 1219 1220 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1221 bool NotUnknownSpecialization = false; 1222 DeclContext *DC = computeDeclContext(SS, false); 1223 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1224 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1225 1226 if (!NotUnknownSpecialization) { 1227 // When the scope specifier can refer to a member of an unknown 1228 // specialization, we take it as a type name. 1229 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1230 SS.getWithLocInContext(Context), 1231 *MemberOrBase, IdLoc); 1232 if (BaseType.isNull()) 1233 return true; 1234 1235 R.clear(); 1236 R.setLookupName(MemberOrBase); 1237 } 1238 } 1239 1240 // If no results were found, try to correct typos. 1241 if (R.empty() && BaseType.isNull() && 1242 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1243 R.isSingleResult()) { 1244 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1245 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1246 // We have found a non-static data member with a similar 1247 // name to what was typed; complain and initialize that 1248 // member. 1249 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1250 << MemberOrBase << true << R.getLookupName() 1251 << FixItHint::CreateReplacement(R.getNameLoc(), 1252 R.getLookupName().getAsString()); 1253 Diag(Member->getLocation(), diag::note_previous_decl) 1254 << Member->getDeclName(); 1255 1256 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1257 LParenLoc, RParenLoc); 1258 } 1259 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1260 const CXXBaseSpecifier *DirectBaseSpec; 1261 const CXXBaseSpecifier *VirtualBaseSpec; 1262 if (FindBaseInitializer(*this, ClassDecl, 1263 Context.getTypeDeclType(Type), 1264 DirectBaseSpec, VirtualBaseSpec)) { 1265 // We have found a direct or virtual base class with a 1266 // similar name to what was typed; complain and initialize 1267 // that base class. 1268 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1269 << MemberOrBase << false << R.getLookupName() 1270 << FixItHint::CreateReplacement(R.getNameLoc(), 1271 R.getLookupName().getAsString()); 1272 1273 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1274 : VirtualBaseSpec; 1275 Diag(BaseSpec->getSourceRange().getBegin(), 1276 diag::note_base_class_specified_here) 1277 << BaseSpec->getType() 1278 << BaseSpec->getSourceRange(); 1279 1280 TyD = Type; 1281 } 1282 } 1283 } 1284 1285 if (!TyD && BaseType.isNull()) { 1286 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1287 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1288 return true; 1289 } 1290 } 1291 1292 if (BaseType.isNull()) { 1293 BaseType = Context.getTypeDeclType(TyD); 1294 if (SS.isSet()) { 1295 NestedNameSpecifier *Qualifier = 1296 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1297 1298 // FIXME: preserve source range information 1299 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1300 } 1301 } 1302 } 1303 1304 if (!TInfo) 1305 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1306 1307 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1308 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1309} 1310 1311/// Checks an initializer expression for use of uninitialized fields, such as 1312/// containing the field that is being initialized. Returns true if there is an 1313/// uninitialized field was used an updates the SourceLocation parameter; false 1314/// otherwise. 1315static bool InitExprContainsUninitializedFields(const Stmt *S, 1316 const ValueDecl *LhsField, 1317 SourceLocation *L) { 1318 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1319 1320 if (isa<CallExpr>(S)) { 1321 // Do not descend into function calls or constructors, as the use 1322 // of an uninitialized field may be valid. One would have to inspect 1323 // the contents of the function/ctor to determine if it is safe or not. 1324 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1325 // may be safe, depending on what the function/ctor does. 1326 return false; 1327 } 1328 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1329 const NamedDecl *RhsField = ME->getMemberDecl(); 1330 1331 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1332 // The member expression points to a static data member. 1333 assert(VD->isStaticDataMember() && 1334 "Member points to non-static data member!"); 1335 (void)VD; 1336 return false; 1337 } 1338 1339 if (isa<EnumConstantDecl>(RhsField)) { 1340 // The member expression points to an enum. 1341 return false; 1342 } 1343 1344 if (RhsField == LhsField) { 1345 // Initializing a field with itself. Throw a warning. 1346 // But wait; there are exceptions! 1347 // Exception #1: The field may not belong to this record. 1348 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1349 const Expr *base = ME->getBase(); 1350 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1351 // Even though the field matches, it does not belong to this record. 1352 return false; 1353 } 1354 // None of the exceptions triggered; return true to indicate an 1355 // uninitialized field was used. 1356 *L = ME->getMemberLoc(); 1357 return true; 1358 } 1359 } else if (isa<SizeOfAlignOfExpr>(S)) { 1360 // sizeof/alignof doesn't reference contents, do not warn. 1361 return false; 1362 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1363 // address-of doesn't reference contents (the pointer may be dereferenced 1364 // in the same expression but it would be rare; and weird). 1365 if (UOE->getOpcode() == UO_AddrOf) 1366 return false; 1367 } 1368 for (Stmt::const_child_range it = S->children(); it; ++it) { 1369 if (!*it) { 1370 // An expression such as 'member(arg ?: "")' may trigger this. 1371 continue; 1372 } 1373 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1374 return true; 1375 } 1376 return false; 1377} 1378 1379MemInitResult 1380Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1381 unsigned NumArgs, SourceLocation IdLoc, 1382 SourceLocation LParenLoc, 1383 SourceLocation RParenLoc) { 1384 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1385 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1386 assert((DirectMember || IndirectMember) && 1387 "Member must be a FieldDecl or IndirectFieldDecl"); 1388 1389 if (Member->isInvalidDecl()) 1390 return true; 1391 1392 // Diagnose value-uses of fields to initialize themselves, e.g. 1393 // foo(foo) 1394 // where foo is not also a parameter to the constructor. 1395 // TODO: implement -Wuninitialized and fold this into that framework. 1396 for (unsigned i = 0; i < NumArgs; ++i) { 1397 SourceLocation L; 1398 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1399 // FIXME: Return true in the case when other fields are used before being 1400 // uninitialized. For example, let this field be the i'th field. When 1401 // initializing the i'th field, throw a warning if any of the >= i'th 1402 // fields are used, as they are not yet initialized. 1403 // Right now we are only handling the case where the i'th field uses 1404 // itself in its initializer. 1405 Diag(L, diag::warn_field_is_uninit); 1406 } 1407 } 1408 1409 bool HasDependentArg = false; 1410 for (unsigned i = 0; i < NumArgs; i++) 1411 HasDependentArg |= Args[i]->isTypeDependent(); 1412 1413 Expr *Init; 1414 if (Member->getType()->isDependentType() || HasDependentArg) { 1415 // Can't check initialization for a member of dependent type or when 1416 // any of the arguments are type-dependent expressions. 1417 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc); 1419 1420 // Erase any temporaries within this evaluation context; we're not 1421 // going to track them in the AST, since we'll be rebuilding the 1422 // ASTs during template instantiation. 1423 ExprTemporaries.erase( 1424 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1425 ExprTemporaries.end()); 1426 } else { 1427 // Initialize the member. 1428 InitializedEntity MemberEntity = 1429 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1430 : InitializedEntity::InitializeMember(IndirectMember, 0); 1431 InitializationKind Kind = 1432 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1433 1434 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1435 1436 ExprResult MemberInit = 1437 InitSeq.Perform(*this, MemberEntity, Kind, 1438 MultiExprArg(*this, Args, NumArgs), 0); 1439 if (MemberInit.isInvalid()) 1440 return true; 1441 1442 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1443 1444 // C++0x [class.base.init]p7: 1445 // The initialization of each base and member constitutes a 1446 // full-expression. 1447 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1448 if (MemberInit.isInvalid()) 1449 return true; 1450 1451 // If we are in a dependent context, template instantiation will 1452 // perform this type-checking again. Just save the arguments that we 1453 // received in a ParenListExpr. 1454 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1455 // of the information that we have about the member 1456 // initializer. However, deconstructing the ASTs is a dicey process, 1457 // and this approach is far more likely to get the corner cases right. 1458 if (CurContext->isDependentContext()) 1459 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1460 RParenLoc); 1461 else 1462 Init = MemberInit.get(); 1463 } 1464 1465 if (DirectMember) { 1466 return new (Context) CXXCtorInitializer(Context, DirectMember, 1467 IdLoc, LParenLoc, Init, 1468 RParenLoc); 1469 } else { 1470 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1471 IdLoc, LParenLoc, Init, 1472 RParenLoc); 1473 } 1474} 1475 1476MemInitResult 1477Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1478 Expr **Args, unsigned NumArgs, 1479 SourceLocation NameLoc, 1480 SourceLocation LParenLoc, 1481 SourceLocation RParenLoc, 1482 CXXRecordDecl *ClassDecl) { 1483 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1484 if (!LangOpts.CPlusPlus0x) 1485 return Diag(Loc, diag::err_delegation_0x_only) 1486 << TInfo->getTypeLoc().getLocalSourceRange(); 1487 1488 // Initialize the object. 1489 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1490 QualType(ClassDecl->getTypeForDecl(), 0)); 1491 InitializationKind Kind = 1492 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1493 1494 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1495 1496 ExprResult DelegationInit = 1497 InitSeq.Perform(*this, DelegationEntity, Kind, 1498 MultiExprArg(*this, Args, NumArgs), 0); 1499 if (DelegationInit.isInvalid()) 1500 return true; 1501 1502 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1503 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1504 assert(Constructor && "Delegating constructor with no target?"); 1505 1506 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1507 1508 // C++0x [class.base.init]p7: 1509 // The initialization of each base and member constitutes a 1510 // full-expression. 1511 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1512 if (DelegationInit.isInvalid()) 1513 return true; 1514 1515 // If we are in a dependent context, template instantiation will 1516 // perform this type-checking again. Just save the arguments that we 1517 // received in a ParenListExpr. 1518 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1519 // of the information that we have about the base 1520 // initializer. However, deconstructing the ASTs is a dicey process, 1521 // and this approach is far more likely to get the corner cases right. 1522 if (CurContext->isDependentContext()) { 1523 ExprResult Init 1524 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1525 NumArgs, RParenLoc)); 1526 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1527 Constructor, Init.takeAs<Expr>(), 1528 RParenLoc); 1529 } 1530 1531 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1532 DelegationInit.takeAs<Expr>(), 1533 RParenLoc); 1534} 1535 1536MemInitResult 1537Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1538 Expr **Args, unsigned NumArgs, 1539 SourceLocation LParenLoc, SourceLocation RParenLoc, 1540 CXXRecordDecl *ClassDecl, 1541 SourceLocation EllipsisLoc) { 1542 bool HasDependentArg = false; 1543 for (unsigned i = 0; i < NumArgs; i++) 1544 HasDependentArg |= Args[i]->isTypeDependent(); 1545 1546 SourceLocation BaseLoc 1547 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1548 1549 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1550 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1551 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1552 1553 // C++ [class.base.init]p2: 1554 // [...] Unless the mem-initializer-id names a nonstatic data 1555 // member of the constructor's class or a direct or virtual base 1556 // of that class, the mem-initializer is ill-formed. A 1557 // mem-initializer-list can initialize a base class using any 1558 // name that denotes that base class type. 1559 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1560 1561 if (EllipsisLoc.isValid()) { 1562 // This is a pack expansion. 1563 if (!BaseType->containsUnexpandedParameterPack()) { 1564 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1565 << SourceRange(BaseLoc, RParenLoc); 1566 1567 EllipsisLoc = SourceLocation(); 1568 } 1569 } else { 1570 // Check for any unexpanded parameter packs. 1571 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1572 return true; 1573 1574 for (unsigned I = 0; I != NumArgs; ++I) 1575 if (DiagnoseUnexpandedParameterPack(Args[I])) 1576 return true; 1577 } 1578 1579 // Check for direct and virtual base classes. 1580 const CXXBaseSpecifier *DirectBaseSpec = 0; 1581 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1582 if (!Dependent) { 1583 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1584 BaseType)) 1585 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1586 LParenLoc, RParenLoc, ClassDecl); 1587 1588 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1589 VirtualBaseSpec); 1590 1591 // C++ [base.class.init]p2: 1592 // Unless the mem-initializer-id names a nonstatic data member of the 1593 // constructor's class or a direct or virtual base of that class, the 1594 // mem-initializer is ill-formed. 1595 if (!DirectBaseSpec && !VirtualBaseSpec) { 1596 // If the class has any dependent bases, then it's possible that 1597 // one of those types will resolve to the same type as 1598 // BaseType. Therefore, just treat this as a dependent base 1599 // class initialization. FIXME: Should we try to check the 1600 // initialization anyway? It seems odd. 1601 if (ClassDecl->hasAnyDependentBases()) 1602 Dependent = true; 1603 else 1604 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1605 << BaseType << Context.getTypeDeclType(ClassDecl) 1606 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1607 } 1608 } 1609 1610 if (Dependent) { 1611 // Can't check initialization for a base of dependent type or when 1612 // any of the arguments are type-dependent expressions. 1613 ExprResult BaseInit 1614 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1615 RParenLoc)); 1616 1617 // Erase any temporaries within this evaluation context; we're not 1618 // going to track them in the AST, since we'll be rebuilding the 1619 // ASTs during template instantiation. 1620 ExprTemporaries.erase( 1621 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1622 ExprTemporaries.end()); 1623 1624 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1625 /*IsVirtual=*/false, 1626 LParenLoc, 1627 BaseInit.takeAs<Expr>(), 1628 RParenLoc, 1629 EllipsisLoc); 1630 } 1631 1632 // C++ [base.class.init]p2: 1633 // If a mem-initializer-id is ambiguous because it designates both 1634 // a direct non-virtual base class and an inherited virtual base 1635 // class, the mem-initializer is ill-formed. 1636 if (DirectBaseSpec && VirtualBaseSpec) 1637 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1638 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1639 1640 CXXBaseSpecifier *BaseSpec 1641 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1642 if (!BaseSpec) 1643 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1644 1645 // Initialize the base. 1646 InitializedEntity BaseEntity = 1647 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1648 InitializationKind Kind = 1649 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1650 1651 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1652 1653 ExprResult BaseInit = 1654 InitSeq.Perform(*this, BaseEntity, Kind, 1655 MultiExprArg(*this, Args, NumArgs), 0); 1656 if (BaseInit.isInvalid()) 1657 return true; 1658 1659 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1660 1661 // C++0x [class.base.init]p7: 1662 // The initialization of each base and member constitutes a 1663 // full-expression. 1664 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1665 if (BaseInit.isInvalid()) 1666 return true; 1667 1668 // If we are in a dependent context, template instantiation will 1669 // perform this type-checking again. Just save the arguments that we 1670 // received in a ParenListExpr. 1671 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1672 // of the information that we have about the base 1673 // initializer. However, deconstructing the ASTs is a dicey process, 1674 // and this approach is far more likely to get the corner cases right. 1675 if (CurContext->isDependentContext()) { 1676 ExprResult Init 1677 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1678 RParenLoc)); 1679 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1680 BaseSpec->isVirtual(), 1681 LParenLoc, 1682 Init.takeAs<Expr>(), 1683 RParenLoc, 1684 EllipsisLoc); 1685 } 1686 1687 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1688 BaseSpec->isVirtual(), 1689 LParenLoc, 1690 BaseInit.takeAs<Expr>(), 1691 RParenLoc, 1692 EllipsisLoc); 1693} 1694 1695/// ImplicitInitializerKind - How an implicit base or member initializer should 1696/// initialize its base or member. 1697enum ImplicitInitializerKind { 1698 IIK_Default, 1699 IIK_Copy, 1700 IIK_Move 1701}; 1702 1703static bool 1704BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1705 ImplicitInitializerKind ImplicitInitKind, 1706 CXXBaseSpecifier *BaseSpec, 1707 bool IsInheritedVirtualBase, 1708 CXXCtorInitializer *&CXXBaseInit) { 1709 InitializedEntity InitEntity 1710 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1711 IsInheritedVirtualBase); 1712 1713 ExprResult BaseInit; 1714 1715 switch (ImplicitInitKind) { 1716 case IIK_Default: { 1717 InitializationKind InitKind 1718 = InitializationKind::CreateDefault(Constructor->getLocation()); 1719 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1720 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1721 MultiExprArg(SemaRef, 0, 0)); 1722 break; 1723 } 1724 1725 case IIK_Copy: { 1726 ParmVarDecl *Param = Constructor->getParamDecl(0); 1727 QualType ParamType = Param->getType().getNonReferenceType(); 1728 1729 Expr *CopyCtorArg = 1730 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1731 Constructor->getLocation(), ParamType, 1732 VK_LValue, 0); 1733 1734 // Cast to the base class to avoid ambiguities. 1735 QualType ArgTy = 1736 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1737 ParamType.getQualifiers()); 1738 1739 CXXCastPath BasePath; 1740 BasePath.push_back(BaseSpec); 1741 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1742 CK_UncheckedDerivedToBase, 1743 VK_LValue, &BasePath); 1744 1745 InitializationKind InitKind 1746 = InitializationKind::CreateDirect(Constructor->getLocation(), 1747 SourceLocation(), SourceLocation()); 1748 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1749 &CopyCtorArg, 1); 1750 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1751 MultiExprArg(&CopyCtorArg, 1)); 1752 break; 1753 } 1754 1755 case IIK_Move: 1756 assert(false && "Unhandled initializer kind!"); 1757 } 1758 1759 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1760 if (BaseInit.isInvalid()) 1761 return true; 1762 1763 CXXBaseInit = 1764 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1765 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1766 SourceLocation()), 1767 BaseSpec->isVirtual(), 1768 SourceLocation(), 1769 BaseInit.takeAs<Expr>(), 1770 SourceLocation(), 1771 SourceLocation()); 1772 1773 return false; 1774} 1775 1776static bool 1777BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1778 ImplicitInitializerKind ImplicitInitKind, 1779 FieldDecl *Field, 1780 CXXCtorInitializer *&CXXMemberInit) { 1781 if (Field->isInvalidDecl()) 1782 return true; 1783 1784 SourceLocation Loc = Constructor->getLocation(); 1785 1786 if (ImplicitInitKind == IIK_Copy) { 1787 ParmVarDecl *Param = Constructor->getParamDecl(0); 1788 QualType ParamType = Param->getType().getNonReferenceType(); 1789 1790 Expr *MemberExprBase = 1791 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1792 Loc, ParamType, VK_LValue, 0); 1793 1794 // Build a reference to this field within the parameter. 1795 CXXScopeSpec SS; 1796 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1797 Sema::LookupMemberName); 1798 MemberLookup.addDecl(Field, AS_public); 1799 MemberLookup.resolveKind(); 1800 ExprResult CopyCtorArg 1801 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1802 ParamType, Loc, 1803 /*IsArrow=*/false, 1804 SS, 1805 /*FirstQualifierInScope=*/0, 1806 MemberLookup, 1807 /*TemplateArgs=*/0); 1808 if (CopyCtorArg.isInvalid()) 1809 return true; 1810 1811 // When the field we are copying is an array, create index variables for 1812 // each dimension of the array. We use these index variables to subscript 1813 // the source array, and other clients (e.g., CodeGen) will perform the 1814 // necessary iteration with these index variables. 1815 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1816 QualType BaseType = Field->getType(); 1817 QualType SizeType = SemaRef.Context.getSizeType(); 1818 while (const ConstantArrayType *Array 1819 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1820 // Create the iteration variable for this array index. 1821 IdentifierInfo *IterationVarName = 0; 1822 { 1823 llvm::SmallString<8> Str; 1824 llvm::raw_svector_ostream OS(Str); 1825 OS << "__i" << IndexVariables.size(); 1826 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1827 } 1828 VarDecl *IterationVar 1829 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1830 IterationVarName, SizeType, 1831 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1832 SC_None, SC_None); 1833 IndexVariables.push_back(IterationVar); 1834 1835 // Create a reference to the iteration variable. 1836 ExprResult IterationVarRef 1837 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1838 assert(!IterationVarRef.isInvalid() && 1839 "Reference to invented variable cannot fail!"); 1840 1841 // Subscript the array with this iteration variable. 1842 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1843 Loc, 1844 IterationVarRef.take(), 1845 Loc); 1846 if (CopyCtorArg.isInvalid()) 1847 return true; 1848 1849 BaseType = Array->getElementType(); 1850 } 1851 1852 // Construct the entity that we will be initializing. For an array, this 1853 // will be first element in the array, which may require several levels 1854 // of array-subscript entities. 1855 llvm::SmallVector<InitializedEntity, 4> Entities; 1856 Entities.reserve(1 + IndexVariables.size()); 1857 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1858 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1859 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1860 0, 1861 Entities.back())); 1862 1863 // Direct-initialize to use the copy constructor. 1864 InitializationKind InitKind = 1865 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1866 1867 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1868 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1869 &CopyCtorArgE, 1); 1870 1871 ExprResult MemberInit 1872 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1873 MultiExprArg(&CopyCtorArgE, 1)); 1874 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1875 if (MemberInit.isInvalid()) 1876 return true; 1877 1878 CXXMemberInit 1879 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1880 MemberInit.takeAs<Expr>(), Loc, 1881 IndexVariables.data(), 1882 IndexVariables.size()); 1883 return false; 1884 } 1885 1886 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1887 1888 QualType FieldBaseElementType = 1889 SemaRef.Context.getBaseElementType(Field->getType()); 1890 1891 if (FieldBaseElementType->isRecordType()) { 1892 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1893 InitializationKind InitKind = 1894 InitializationKind::CreateDefault(Loc); 1895 1896 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1897 ExprResult MemberInit = 1898 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1899 1900 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1901 if (MemberInit.isInvalid()) 1902 return true; 1903 1904 CXXMemberInit = 1905 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1906 Field, Loc, Loc, 1907 MemberInit.get(), 1908 Loc); 1909 return false; 1910 } 1911 1912 if (FieldBaseElementType->isReferenceType()) { 1913 SemaRef.Diag(Constructor->getLocation(), 1914 diag::err_uninitialized_member_in_ctor) 1915 << (int)Constructor->isImplicit() 1916 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1917 << 0 << Field->getDeclName(); 1918 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1919 return true; 1920 } 1921 1922 if (FieldBaseElementType.isConstQualified()) { 1923 SemaRef.Diag(Constructor->getLocation(), 1924 diag::err_uninitialized_member_in_ctor) 1925 << (int)Constructor->isImplicit() 1926 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1927 << 1 << Field->getDeclName(); 1928 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1929 return true; 1930 } 1931 1932 // Nothing to initialize. 1933 CXXMemberInit = 0; 1934 return false; 1935} 1936 1937namespace { 1938struct BaseAndFieldInfo { 1939 Sema &S; 1940 CXXConstructorDecl *Ctor; 1941 bool AnyErrorsInInits; 1942 ImplicitInitializerKind IIK; 1943 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1944 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1945 1946 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1947 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1948 // FIXME: Handle implicit move constructors. 1949 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1950 IIK = IIK_Copy; 1951 else 1952 IIK = IIK_Default; 1953 } 1954}; 1955} 1956 1957static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1958 FieldDecl *Top, FieldDecl *Field) { 1959 1960 // Overwhelmingly common case: we have a direct initializer for this field. 1961 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1962 Info.AllToInit.push_back(Init); 1963 return false; 1964 } 1965 1966 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1967 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1968 assert(FieldClassType && "anonymous struct/union without record type"); 1969 CXXRecordDecl *FieldClassDecl 1970 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1971 1972 // Even though union members never have non-trivial default 1973 // constructions in C++03, we still build member initializers for aggregate 1974 // record types which can be union members, and C++0x allows non-trivial 1975 // default constructors for union members, so we ensure that only one 1976 // member is initialized for these. 1977 if (FieldClassDecl->isUnion()) { 1978 // First check for an explicit initializer for one field. 1979 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1980 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1981 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1982 Info.AllToInit.push_back(Init); 1983 1984 // Once we've initialized a field of an anonymous union, the union 1985 // field in the class is also initialized, so exit immediately. 1986 return false; 1987 } else if ((*FA)->isAnonymousStructOrUnion()) { 1988 if (CollectFieldInitializer(Info, Top, *FA)) 1989 return true; 1990 } 1991 } 1992 1993 // Fallthrough and construct a default initializer for the union as 1994 // a whole, which can call its default constructor if such a thing exists 1995 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1996 // behavior going forward with C++0x, when anonymous unions there are 1997 // finalized, we should revisit this. 1998 } else { 1999 // For structs, we simply descend through to initialize all members where 2000 // necessary. 2001 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2002 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2003 if (CollectFieldInitializer(Info, Top, *FA)) 2004 return true; 2005 } 2006 } 2007 } 2008 2009 // Don't try to build an implicit initializer if there were semantic 2010 // errors in any of the initializers (and therefore we might be 2011 // missing some that the user actually wrote). 2012 if (Info.AnyErrorsInInits) 2013 return false; 2014 2015 CXXCtorInitializer *Init = 0; 2016 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2017 return true; 2018 2019 if (Init) 2020 Info.AllToInit.push_back(Init); 2021 2022 return false; 2023} 2024 2025bool 2026Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2027 CXXCtorInitializer **Initializers, 2028 unsigned NumInitializers, 2029 bool AnyErrors) { 2030 if (Constructor->getDeclContext()->isDependentContext()) { 2031 // Just store the initializers as written, they will be checked during 2032 // instantiation. 2033 if (NumInitializers > 0) { 2034 Constructor->setNumCtorInitializers(NumInitializers); 2035 CXXCtorInitializer **baseOrMemberInitializers = 2036 new (Context) CXXCtorInitializer*[NumInitializers]; 2037 memcpy(baseOrMemberInitializers, Initializers, 2038 NumInitializers * sizeof(CXXCtorInitializer*)); 2039 Constructor->setCtorInitializers(baseOrMemberInitializers); 2040 } 2041 2042 return false; 2043 } 2044 2045 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2046 2047 // We need to build the initializer AST according to order of construction 2048 // and not what user specified in the Initializers list. 2049 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2050 if (!ClassDecl) 2051 return true; 2052 2053 bool HadError = false; 2054 2055 for (unsigned i = 0; i < NumInitializers; i++) { 2056 CXXCtorInitializer *Member = Initializers[i]; 2057 2058 if (Member->isBaseInitializer()) 2059 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2060 else 2061 Info.AllBaseFields[Member->getAnyMember()] = Member; 2062 } 2063 2064 // Keep track of the direct virtual bases. 2065 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2066 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2067 E = ClassDecl->bases_end(); I != E; ++I) { 2068 if (I->isVirtual()) 2069 DirectVBases.insert(I); 2070 } 2071 2072 // Push virtual bases before others. 2073 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2074 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2075 2076 if (CXXCtorInitializer *Value 2077 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2078 Info.AllToInit.push_back(Value); 2079 } else if (!AnyErrors) { 2080 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2081 CXXCtorInitializer *CXXBaseInit; 2082 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2083 VBase, IsInheritedVirtualBase, 2084 CXXBaseInit)) { 2085 HadError = true; 2086 continue; 2087 } 2088 2089 Info.AllToInit.push_back(CXXBaseInit); 2090 } 2091 } 2092 2093 // Non-virtual bases. 2094 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2095 E = ClassDecl->bases_end(); Base != E; ++Base) { 2096 // Virtuals are in the virtual base list and already constructed. 2097 if (Base->isVirtual()) 2098 continue; 2099 2100 if (CXXCtorInitializer *Value 2101 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2102 Info.AllToInit.push_back(Value); 2103 } else if (!AnyErrors) { 2104 CXXCtorInitializer *CXXBaseInit; 2105 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2106 Base, /*IsInheritedVirtualBase=*/false, 2107 CXXBaseInit)) { 2108 HadError = true; 2109 continue; 2110 } 2111 2112 Info.AllToInit.push_back(CXXBaseInit); 2113 } 2114 } 2115 2116 // Fields. 2117 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2118 E = ClassDecl->field_end(); Field != E; ++Field) { 2119 if ((*Field)->getType()->isIncompleteArrayType()) { 2120 assert(ClassDecl->hasFlexibleArrayMember() && 2121 "Incomplete array type is not valid"); 2122 continue; 2123 } 2124 if (CollectFieldInitializer(Info, *Field, *Field)) 2125 HadError = true; 2126 } 2127 2128 NumInitializers = Info.AllToInit.size(); 2129 if (NumInitializers > 0) { 2130 Constructor->setNumCtorInitializers(NumInitializers); 2131 CXXCtorInitializer **baseOrMemberInitializers = 2132 new (Context) CXXCtorInitializer*[NumInitializers]; 2133 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2134 NumInitializers * sizeof(CXXCtorInitializer*)); 2135 Constructor->setCtorInitializers(baseOrMemberInitializers); 2136 2137 // Constructors implicitly reference the base and member 2138 // destructors. 2139 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2140 Constructor->getParent()); 2141 } 2142 2143 return HadError; 2144} 2145 2146static void *GetKeyForTopLevelField(FieldDecl *Field) { 2147 // For anonymous unions, use the class declaration as the key. 2148 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2149 if (RT->getDecl()->isAnonymousStructOrUnion()) 2150 return static_cast<void *>(RT->getDecl()); 2151 } 2152 return static_cast<void *>(Field); 2153} 2154 2155static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2156 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2157} 2158 2159static void *GetKeyForMember(ASTContext &Context, 2160 CXXCtorInitializer *Member) { 2161 if (!Member->isAnyMemberInitializer()) 2162 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2163 2164 // For fields injected into the class via declaration of an anonymous union, 2165 // use its anonymous union class declaration as the unique key. 2166 FieldDecl *Field = Member->getAnyMember(); 2167 2168 // If the field is a member of an anonymous struct or union, our key 2169 // is the anonymous record decl that's a direct child of the class. 2170 RecordDecl *RD = Field->getParent(); 2171 if (RD->isAnonymousStructOrUnion()) { 2172 while (true) { 2173 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2174 if (Parent->isAnonymousStructOrUnion()) 2175 RD = Parent; 2176 else 2177 break; 2178 } 2179 2180 return static_cast<void *>(RD); 2181 } 2182 2183 return static_cast<void *>(Field); 2184} 2185 2186static void 2187DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2188 const CXXConstructorDecl *Constructor, 2189 CXXCtorInitializer **Inits, 2190 unsigned NumInits) { 2191 if (Constructor->getDeclContext()->isDependentContext()) 2192 return; 2193 2194 // Don't check initializers order unless the warning is enabled at the 2195 // location of at least one initializer. 2196 bool ShouldCheckOrder = false; 2197 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2198 CXXCtorInitializer *Init = Inits[InitIndex]; 2199 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2200 Init->getSourceLocation()) 2201 != Diagnostic::Ignored) { 2202 ShouldCheckOrder = true; 2203 break; 2204 } 2205 } 2206 if (!ShouldCheckOrder) 2207 return; 2208 2209 // Build the list of bases and members in the order that they'll 2210 // actually be initialized. The explicit initializers should be in 2211 // this same order but may be missing things. 2212 llvm::SmallVector<const void*, 32> IdealInitKeys; 2213 2214 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2215 2216 // 1. Virtual bases. 2217 for (CXXRecordDecl::base_class_const_iterator VBase = 2218 ClassDecl->vbases_begin(), 2219 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2220 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2221 2222 // 2. Non-virtual bases. 2223 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2224 E = ClassDecl->bases_end(); Base != E; ++Base) { 2225 if (Base->isVirtual()) 2226 continue; 2227 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2228 } 2229 2230 // 3. Direct fields. 2231 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2232 E = ClassDecl->field_end(); Field != E; ++Field) 2233 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2234 2235 unsigned NumIdealInits = IdealInitKeys.size(); 2236 unsigned IdealIndex = 0; 2237 2238 CXXCtorInitializer *PrevInit = 0; 2239 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2240 CXXCtorInitializer *Init = Inits[InitIndex]; 2241 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2242 2243 // Scan forward to try to find this initializer in the idealized 2244 // initializers list. 2245 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2246 if (InitKey == IdealInitKeys[IdealIndex]) 2247 break; 2248 2249 // If we didn't find this initializer, it must be because we 2250 // scanned past it on a previous iteration. That can only 2251 // happen if we're out of order; emit a warning. 2252 if (IdealIndex == NumIdealInits && PrevInit) { 2253 Sema::SemaDiagnosticBuilder D = 2254 SemaRef.Diag(PrevInit->getSourceLocation(), 2255 diag::warn_initializer_out_of_order); 2256 2257 if (PrevInit->isAnyMemberInitializer()) 2258 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2259 else 2260 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2261 2262 if (Init->isAnyMemberInitializer()) 2263 D << 0 << Init->getAnyMember()->getDeclName(); 2264 else 2265 D << 1 << Init->getBaseClassInfo()->getType(); 2266 2267 // Move back to the initializer's location in the ideal list. 2268 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2269 if (InitKey == IdealInitKeys[IdealIndex]) 2270 break; 2271 2272 assert(IdealIndex != NumIdealInits && 2273 "initializer not found in initializer list"); 2274 } 2275 2276 PrevInit = Init; 2277 } 2278} 2279 2280namespace { 2281bool CheckRedundantInit(Sema &S, 2282 CXXCtorInitializer *Init, 2283 CXXCtorInitializer *&PrevInit) { 2284 if (!PrevInit) { 2285 PrevInit = Init; 2286 return false; 2287 } 2288 2289 if (FieldDecl *Field = Init->getMember()) 2290 S.Diag(Init->getSourceLocation(), 2291 diag::err_multiple_mem_initialization) 2292 << Field->getDeclName() 2293 << Init->getSourceRange(); 2294 else { 2295 const Type *BaseClass = Init->getBaseClass(); 2296 assert(BaseClass && "neither field nor base"); 2297 S.Diag(Init->getSourceLocation(), 2298 diag::err_multiple_base_initialization) 2299 << QualType(BaseClass, 0) 2300 << Init->getSourceRange(); 2301 } 2302 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2303 << 0 << PrevInit->getSourceRange(); 2304 2305 return true; 2306} 2307 2308typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2309typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2310 2311bool CheckRedundantUnionInit(Sema &S, 2312 CXXCtorInitializer *Init, 2313 RedundantUnionMap &Unions) { 2314 FieldDecl *Field = Init->getAnyMember(); 2315 RecordDecl *Parent = Field->getParent(); 2316 if (!Parent->isAnonymousStructOrUnion()) 2317 return false; 2318 2319 NamedDecl *Child = Field; 2320 do { 2321 if (Parent->isUnion()) { 2322 UnionEntry &En = Unions[Parent]; 2323 if (En.first && En.first != Child) { 2324 S.Diag(Init->getSourceLocation(), 2325 diag::err_multiple_mem_union_initialization) 2326 << Field->getDeclName() 2327 << Init->getSourceRange(); 2328 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2329 << 0 << En.second->getSourceRange(); 2330 return true; 2331 } else if (!En.first) { 2332 En.first = Child; 2333 En.second = Init; 2334 } 2335 } 2336 2337 Child = Parent; 2338 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2339 } while (Parent->isAnonymousStructOrUnion()); 2340 2341 return false; 2342} 2343} 2344 2345/// ActOnMemInitializers - Handle the member initializers for a constructor. 2346void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2347 SourceLocation ColonLoc, 2348 MemInitTy **meminits, unsigned NumMemInits, 2349 bool AnyErrors) { 2350 if (!ConstructorDecl) 2351 return; 2352 2353 AdjustDeclIfTemplate(ConstructorDecl); 2354 2355 CXXConstructorDecl *Constructor 2356 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2357 2358 if (!Constructor) { 2359 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2360 return; 2361 } 2362 2363 CXXCtorInitializer **MemInits = 2364 reinterpret_cast<CXXCtorInitializer **>(meminits); 2365 2366 // Mapping for the duplicate initializers check. 2367 // For member initializers, this is keyed with a FieldDecl*. 2368 // For base initializers, this is keyed with a Type*. 2369 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2370 2371 // Mapping for the inconsistent anonymous-union initializers check. 2372 RedundantUnionMap MemberUnions; 2373 2374 bool HadError = false; 2375 for (unsigned i = 0; i < NumMemInits; i++) { 2376 CXXCtorInitializer *Init = MemInits[i]; 2377 2378 // Set the source order index. 2379 Init->setSourceOrder(i); 2380 2381 if (Init->isAnyMemberInitializer()) { 2382 FieldDecl *Field = Init->getAnyMember(); 2383 if (CheckRedundantInit(*this, Init, Members[Field]) || 2384 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2385 HadError = true; 2386 } else if (Init->isBaseInitializer()) { 2387 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2388 if (CheckRedundantInit(*this, Init, Members[Key])) 2389 HadError = true; 2390 } else { 2391 assert(Init->isDelegatingInitializer()); 2392 // This must be the only initializer 2393 if (i != 0 || NumMemInits > 1) { 2394 Diag(MemInits[0]->getSourceLocation(), 2395 diag::err_delegating_initializer_alone) 2396 << MemInits[0]->getSourceRange(); 2397 HadError = true; 2398 } 2399 } 2400 } 2401 2402 if (HadError) 2403 return; 2404 2405 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2406 2407 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2408} 2409 2410void 2411Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2412 CXXRecordDecl *ClassDecl) { 2413 // Ignore dependent contexts. 2414 if (ClassDecl->isDependentContext()) 2415 return; 2416 2417 // FIXME: all the access-control diagnostics are positioned on the 2418 // field/base declaration. That's probably good; that said, the 2419 // user might reasonably want to know why the destructor is being 2420 // emitted, and we currently don't say. 2421 2422 // Non-static data members. 2423 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2424 E = ClassDecl->field_end(); I != E; ++I) { 2425 FieldDecl *Field = *I; 2426 if (Field->isInvalidDecl()) 2427 continue; 2428 QualType FieldType = Context.getBaseElementType(Field->getType()); 2429 2430 const RecordType* RT = FieldType->getAs<RecordType>(); 2431 if (!RT) 2432 continue; 2433 2434 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2435 if (FieldClassDecl->hasTrivialDestructor()) 2436 continue; 2437 2438 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2439 CheckDestructorAccess(Field->getLocation(), Dtor, 2440 PDiag(diag::err_access_dtor_field) 2441 << Field->getDeclName() 2442 << FieldType); 2443 2444 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2445 } 2446 2447 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2448 2449 // Bases. 2450 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2451 E = ClassDecl->bases_end(); Base != E; ++Base) { 2452 // Bases are always records in a well-formed non-dependent class. 2453 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2454 2455 // Remember direct virtual bases. 2456 if (Base->isVirtual()) 2457 DirectVirtualBases.insert(RT); 2458 2459 // Ignore trivial destructors. 2460 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2461 if (BaseClassDecl->hasTrivialDestructor()) 2462 continue; 2463 2464 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2465 2466 // FIXME: caret should be on the start of the class name 2467 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2468 PDiag(diag::err_access_dtor_base) 2469 << Base->getType() 2470 << Base->getSourceRange()); 2471 2472 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2473 } 2474 2475 // Virtual bases. 2476 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2477 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2478 2479 // Bases are always records in a well-formed non-dependent class. 2480 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2481 2482 // Ignore direct virtual bases. 2483 if (DirectVirtualBases.count(RT)) 2484 continue; 2485 2486 // Ignore trivial destructors. 2487 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2488 if (BaseClassDecl->hasTrivialDestructor()) 2489 continue; 2490 2491 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2492 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2493 PDiag(diag::err_access_dtor_vbase) 2494 << VBase->getType()); 2495 2496 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2497 } 2498} 2499 2500void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2501 if (!CDtorDecl) 2502 return; 2503 2504 if (CXXConstructorDecl *Constructor 2505 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2506 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2507} 2508 2509bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2510 unsigned DiagID, AbstractDiagSelID SelID) { 2511 if (SelID == -1) 2512 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2513 else 2514 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2515} 2516 2517bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2518 const PartialDiagnostic &PD) { 2519 if (!getLangOptions().CPlusPlus) 2520 return false; 2521 2522 if (const ArrayType *AT = Context.getAsArrayType(T)) 2523 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2524 2525 if (const PointerType *PT = T->getAs<PointerType>()) { 2526 // Find the innermost pointer type. 2527 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2528 PT = T; 2529 2530 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2531 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2532 } 2533 2534 const RecordType *RT = T->getAs<RecordType>(); 2535 if (!RT) 2536 return false; 2537 2538 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2539 2540 // We can't answer whether something is abstract until it has a 2541 // definition. If it's currently being defined, we'll walk back 2542 // over all the declarations when we have a full definition. 2543 const CXXRecordDecl *Def = RD->getDefinition(); 2544 if (!Def || Def->isBeingDefined()) 2545 return false; 2546 2547 if (!RD->isAbstract()) 2548 return false; 2549 2550 Diag(Loc, PD) << RD->getDeclName(); 2551 DiagnoseAbstractType(RD); 2552 2553 return true; 2554} 2555 2556void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2557 // Check if we've already emitted the list of pure virtual functions 2558 // for this class. 2559 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2560 return; 2561 2562 CXXFinalOverriderMap FinalOverriders; 2563 RD->getFinalOverriders(FinalOverriders); 2564 2565 // Keep a set of seen pure methods so we won't diagnose the same method 2566 // more than once. 2567 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2568 2569 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2570 MEnd = FinalOverriders.end(); 2571 M != MEnd; 2572 ++M) { 2573 for (OverridingMethods::iterator SO = M->second.begin(), 2574 SOEnd = M->second.end(); 2575 SO != SOEnd; ++SO) { 2576 // C++ [class.abstract]p4: 2577 // A class is abstract if it contains or inherits at least one 2578 // pure virtual function for which the final overrider is pure 2579 // virtual. 2580 2581 // 2582 if (SO->second.size() != 1) 2583 continue; 2584 2585 if (!SO->second.front().Method->isPure()) 2586 continue; 2587 2588 if (!SeenPureMethods.insert(SO->second.front().Method)) 2589 continue; 2590 2591 Diag(SO->second.front().Method->getLocation(), 2592 diag::note_pure_virtual_function) 2593 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2594 } 2595 } 2596 2597 if (!PureVirtualClassDiagSet) 2598 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2599 PureVirtualClassDiagSet->insert(RD); 2600} 2601 2602namespace { 2603struct AbstractUsageInfo { 2604 Sema &S; 2605 CXXRecordDecl *Record; 2606 CanQualType AbstractType; 2607 bool Invalid; 2608 2609 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2610 : S(S), Record(Record), 2611 AbstractType(S.Context.getCanonicalType( 2612 S.Context.getTypeDeclType(Record))), 2613 Invalid(false) {} 2614 2615 void DiagnoseAbstractType() { 2616 if (Invalid) return; 2617 S.DiagnoseAbstractType(Record); 2618 Invalid = true; 2619 } 2620 2621 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2622}; 2623 2624struct CheckAbstractUsage { 2625 AbstractUsageInfo &Info; 2626 const NamedDecl *Ctx; 2627 2628 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2629 : Info(Info), Ctx(Ctx) {} 2630 2631 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2632 switch (TL.getTypeLocClass()) { 2633#define ABSTRACT_TYPELOC(CLASS, PARENT) 2634#define TYPELOC(CLASS, PARENT) \ 2635 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2636#include "clang/AST/TypeLocNodes.def" 2637 } 2638 } 2639 2640 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2641 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2642 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2643 if (!TL.getArg(I)) 2644 continue; 2645 2646 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2647 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2648 } 2649 } 2650 2651 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2652 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2653 } 2654 2655 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2656 // Visit the type parameters from a permissive context. 2657 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2658 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2659 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2660 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2661 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2662 // TODO: other template argument types? 2663 } 2664 } 2665 2666 // Visit pointee types from a permissive context. 2667#define CheckPolymorphic(Type) \ 2668 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2669 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2670 } 2671 CheckPolymorphic(PointerTypeLoc) 2672 CheckPolymorphic(ReferenceTypeLoc) 2673 CheckPolymorphic(MemberPointerTypeLoc) 2674 CheckPolymorphic(BlockPointerTypeLoc) 2675 2676 /// Handle all the types we haven't given a more specific 2677 /// implementation for above. 2678 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2679 // Every other kind of type that we haven't called out already 2680 // that has an inner type is either (1) sugar or (2) contains that 2681 // inner type in some way as a subobject. 2682 if (TypeLoc Next = TL.getNextTypeLoc()) 2683 return Visit(Next, Sel); 2684 2685 // If there's no inner type and we're in a permissive context, 2686 // don't diagnose. 2687 if (Sel == Sema::AbstractNone) return; 2688 2689 // Check whether the type matches the abstract type. 2690 QualType T = TL.getType(); 2691 if (T->isArrayType()) { 2692 Sel = Sema::AbstractArrayType; 2693 T = Info.S.Context.getBaseElementType(T); 2694 } 2695 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2696 if (CT != Info.AbstractType) return; 2697 2698 // It matched; do some magic. 2699 if (Sel == Sema::AbstractArrayType) { 2700 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2701 << T << TL.getSourceRange(); 2702 } else { 2703 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2704 << Sel << T << TL.getSourceRange(); 2705 } 2706 Info.DiagnoseAbstractType(); 2707 } 2708}; 2709 2710void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2711 Sema::AbstractDiagSelID Sel) { 2712 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2713} 2714 2715} 2716 2717/// Check for invalid uses of an abstract type in a method declaration. 2718static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2719 CXXMethodDecl *MD) { 2720 // No need to do the check on definitions, which require that 2721 // the return/param types be complete. 2722 if (MD->isThisDeclarationADefinition()) 2723 return; 2724 2725 // For safety's sake, just ignore it if we don't have type source 2726 // information. This should never happen for non-implicit methods, 2727 // but... 2728 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2729 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2730} 2731 2732/// Check for invalid uses of an abstract type within a class definition. 2733static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2734 CXXRecordDecl *RD) { 2735 for (CXXRecordDecl::decl_iterator 2736 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2737 Decl *D = *I; 2738 if (D->isImplicit()) continue; 2739 2740 // Methods and method templates. 2741 if (isa<CXXMethodDecl>(D)) { 2742 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2743 } else if (isa<FunctionTemplateDecl>(D)) { 2744 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2745 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2746 2747 // Fields and static variables. 2748 } else if (isa<FieldDecl>(D)) { 2749 FieldDecl *FD = cast<FieldDecl>(D); 2750 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2751 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2752 } else if (isa<VarDecl>(D)) { 2753 VarDecl *VD = cast<VarDecl>(D); 2754 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2755 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2756 2757 // Nested classes and class templates. 2758 } else if (isa<CXXRecordDecl>(D)) { 2759 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2760 } else if (isa<ClassTemplateDecl>(D)) { 2761 CheckAbstractClassUsage(Info, 2762 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2763 } 2764 } 2765} 2766 2767/// \brief Perform semantic checks on a class definition that has been 2768/// completing, introducing implicitly-declared members, checking for 2769/// abstract types, etc. 2770void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2771 if (!Record) 2772 return; 2773 2774 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2775 AbstractUsageInfo Info(*this, Record); 2776 CheckAbstractClassUsage(Info, Record); 2777 } 2778 2779 // If this is not an aggregate type and has no user-declared constructor, 2780 // complain about any non-static data members of reference or const scalar 2781 // type, since they will never get initializers. 2782 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2783 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2784 bool Complained = false; 2785 for (RecordDecl::field_iterator F = Record->field_begin(), 2786 FEnd = Record->field_end(); 2787 F != FEnd; ++F) { 2788 if (F->getType()->isReferenceType() || 2789 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2790 if (!Complained) { 2791 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2792 << Record->getTagKind() << Record; 2793 Complained = true; 2794 } 2795 2796 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2797 << F->getType()->isReferenceType() 2798 << F->getDeclName(); 2799 } 2800 } 2801 } 2802 2803 if (Record->isDynamicClass() && !Record->isDependentType()) 2804 DynamicClasses.push_back(Record); 2805 2806 if (Record->getIdentifier()) { 2807 // C++ [class.mem]p13: 2808 // If T is the name of a class, then each of the following shall have a 2809 // name different from T: 2810 // - every member of every anonymous union that is a member of class T. 2811 // 2812 // C++ [class.mem]p14: 2813 // In addition, if class T has a user-declared constructor (12.1), every 2814 // non-static data member of class T shall have a name different from T. 2815 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2816 R.first != R.second; ++R.first) { 2817 NamedDecl *D = *R.first; 2818 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2819 isa<IndirectFieldDecl>(D)) { 2820 Diag(D->getLocation(), diag::err_member_name_of_class) 2821 << D->getDeclName(); 2822 break; 2823 } 2824 } 2825 } 2826 2827 // Warn if the class has virtual methods but non-virtual public destructor. 2828 if (Record->isPolymorphic() && !Record->isDependentType()) { 2829 CXXDestructorDecl *dtor = Record->getDestructor(); 2830 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2831 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2832 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2833 } 2834 2835 // See if a method overloads virtual methods in a base 2836 /// class without overriding any. 2837 if (!Record->isDependentType()) { 2838 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2839 MEnd = Record->method_end(); 2840 M != MEnd; ++M) { 2841 if (!(*M)->isStatic()) 2842 DiagnoseHiddenVirtualMethods(Record, *M); 2843 } 2844 } 2845 2846 // Declare inherited constructors. We do this eagerly here because: 2847 // - The standard requires an eager diagnostic for conflicting inherited 2848 // constructors from different classes. 2849 // - The lazy declaration of the other implicit constructors is so as to not 2850 // waste space and performance on classes that are not meant to be 2851 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2852 // have inherited constructors. 2853 DeclareInheritedConstructors(Record); 2854} 2855 2856/// \brief Data used with FindHiddenVirtualMethod 2857namespace { 2858 struct FindHiddenVirtualMethodData { 2859 Sema *S; 2860 CXXMethodDecl *Method; 2861 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2862 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2863 }; 2864} 2865 2866/// \brief Member lookup function that determines whether a given C++ 2867/// method overloads virtual methods in a base class without overriding any, 2868/// to be used with CXXRecordDecl::lookupInBases(). 2869static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2870 CXXBasePath &Path, 2871 void *UserData) { 2872 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2873 2874 FindHiddenVirtualMethodData &Data 2875 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2876 2877 DeclarationName Name = Data.Method->getDeclName(); 2878 assert(Name.getNameKind() == DeclarationName::Identifier); 2879 2880 bool foundSameNameMethod = false; 2881 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2882 for (Path.Decls = BaseRecord->lookup(Name); 2883 Path.Decls.first != Path.Decls.second; 2884 ++Path.Decls.first) { 2885 NamedDecl *D = *Path.Decls.first; 2886 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2887 MD = MD->getCanonicalDecl(); 2888 foundSameNameMethod = true; 2889 // Interested only in hidden virtual methods. 2890 if (!MD->isVirtual()) 2891 continue; 2892 // If the method we are checking overrides a method from its base 2893 // don't warn about the other overloaded methods. 2894 if (!Data.S->IsOverload(Data.Method, MD, false)) 2895 return true; 2896 // Collect the overload only if its hidden. 2897 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2898 overloadedMethods.push_back(MD); 2899 } 2900 } 2901 2902 if (foundSameNameMethod) 2903 Data.OverloadedMethods.append(overloadedMethods.begin(), 2904 overloadedMethods.end()); 2905 return foundSameNameMethod; 2906} 2907 2908/// \brief See if a method overloads virtual methods in a base class without 2909/// overriding any. 2910void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2911 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2912 MD->getLocation()) == Diagnostic::Ignored) 2913 return; 2914 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2915 return; 2916 2917 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2918 /*bool RecordPaths=*/false, 2919 /*bool DetectVirtual=*/false); 2920 FindHiddenVirtualMethodData Data; 2921 Data.Method = MD; 2922 Data.S = this; 2923 2924 // Keep the base methods that were overriden or introduced in the subclass 2925 // by 'using' in a set. A base method not in this set is hidden. 2926 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2927 res.first != res.second; ++res.first) { 2928 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2929 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2930 E = MD->end_overridden_methods(); 2931 I != E; ++I) 2932 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2933 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2934 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2935 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2936 } 2937 2938 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2939 !Data.OverloadedMethods.empty()) { 2940 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2941 << MD << (Data.OverloadedMethods.size() > 1); 2942 2943 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 2944 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 2945 Diag(overloadedMD->getLocation(), 2946 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 2947 } 2948 } 2949} 2950 2951void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2952 Decl *TagDecl, 2953 SourceLocation LBrac, 2954 SourceLocation RBrac, 2955 AttributeList *AttrList) { 2956 if (!TagDecl) 2957 return; 2958 2959 AdjustDeclIfTemplate(TagDecl); 2960 2961 ActOnFields(S, RLoc, TagDecl, 2962 // strict aliasing violation! 2963 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2964 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2965 2966 CheckCompletedCXXClass( 2967 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2968} 2969 2970namespace { 2971 /// \brief Helper class that collects exception specifications for 2972 /// implicitly-declared special member functions. 2973 class ImplicitExceptionSpecification { 2974 ASTContext &Context; 2975 bool AllowsAllExceptions; 2976 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2977 llvm::SmallVector<QualType, 4> Exceptions; 2978 2979 public: 2980 explicit ImplicitExceptionSpecification(ASTContext &Context) 2981 : Context(Context), AllowsAllExceptions(false) { } 2982 2983 /// \brief Whether the special member function should have any 2984 /// exception specification at all. 2985 bool hasExceptionSpecification() const { 2986 return !AllowsAllExceptions; 2987 } 2988 2989 /// \brief Whether the special member function should have a 2990 /// throw(...) exception specification (a Microsoft extension). 2991 bool hasAnyExceptionSpecification() const { 2992 return false; 2993 } 2994 2995 /// \brief The number of exceptions in the exception specification. 2996 unsigned size() const { return Exceptions.size(); } 2997 2998 /// \brief The set of exceptions in the exception specification. 2999 const QualType *data() const { return Exceptions.data(); } 3000 3001 /// \brief Note that 3002 void CalledDecl(CXXMethodDecl *Method) { 3003 // If we already know that we allow all exceptions, do nothing. 3004 if (AllowsAllExceptions || !Method) 3005 return; 3006 3007 const FunctionProtoType *Proto 3008 = Method->getType()->getAs<FunctionProtoType>(); 3009 3010 // If this function can throw any exceptions, make a note of that. 3011 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 3012 AllowsAllExceptions = true; 3013 ExceptionsSeen.clear(); 3014 Exceptions.clear(); 3015 return; 3016 } 3017 3018 // Record the exceptions in this function's exception specification. 3019 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3020 EEnd = Proto->exception_end(); 3021 E != EEnd; ++E) 3022 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3023 Exceptions.push_back(*E); 3024 } 3025 }; 3026} 3027 3028 3029/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3030/// special functions, such as the default constructor, copy 3031/// constructor, or destructor, to the given C++ class (C++ 3032/// [special]p1). This routine can only be executed just before the 3033/// definition of the class is complete. 3034void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3035 if (!ClassDecl->hasUserDeclaredConstructor()) 3036 ++ASTContext::NumImplicitDefaultConstructors; 3037 3038 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3039 ++ASTContext::NumImplicitCopyConstructors; 3040 3041 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3042 ++ASTContext::NumImplicitCopyAssignmentOperators; 3043 3044 // If we have a dynamic class, then the copy assignment operator may be 3045 // virtual, so we have to declare it immediately. This ensures that, e.g., 3046 // it shows up in the right place in the vtable and that we diagnose 3047 // problems with the implicit exception specification. 3048 if (ClassDecl->isDynamicClass()) 3049 DeclareImplicitCopyAssignment(ClassDecl); 3050 } 3051 3052 if (!ClassDecl->hasUserDeclaredDestructor()) { 3053 ++ASTContext::NumImplicitDestructors; 3054 3055 // If we have a dynamic class, then the destructor may be virtual, so we 3056 // have to declare the destructor immediately. This ensures that, e.g., it 3057 // shows up in the right place in the vtable and that we diagnose problems 3058 // with the implicit exception specification. 3059 if (ClassDecl->isDynamicClass()) 3060 DeclareImplicitDestructor(ClassDecl); 3061 } 3062} 3063 3064void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3065 if (!D) 3066 return; 3067 3068 TemplateParameterList *Params = 0; 3069 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3070 Params = Template->getTemplateParameters(); 3071 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3072 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3073 Params = PartialSpec->getTemplateParameters(); 3074 else 3075 return; 3076 3077 for (TemplateParameterList::iterator Param = Params->begin(), 3078 ParamEnd = Params->end(); 3079 Param != ParamEnd; ++Param) { 3080 NamedDecl *Named = cast<NamedDecl>(*Param); 3081 if (Named->getDeclName()) { 3082 S->AddDecl(Named); 3083 IdResolver.AddDecl(Named); 3084 } 3085 } 3086} 3087 3088void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3089 if (!RecordD) return; 3090 AdjustDeclIfTemplate(RecordD); 3091 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3092 PushDeclContext(S, Record); 3093} 3094 3095void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3096 if (!RecordD) return; 3097 PopDeclContext(); 3098} 3099 3100/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3101/// parsing a top-level (non-nested) C++ class, and we are now 3102/// parsing those parts of the given Method declaration that could 3103/// not be parsed earlier (C++ [class.mem]p2), such as default 3104/// arguments. This action should enter the scope of the given 3105/// Method declaration as if we had just parsed the qualified method 3106/// name. However, it should not bring the parameters into scope; 3107/// that will be performed by ActOnDelayedCXXMethodParameter. 3108void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3109} 3110 3111/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3112/// C++ method declaration. We're (re-)introducing the given 3113/// function parameter into scope for use in parsing later parts of 3114/// the method declaration. For example, we could see an 3115/// ActOnParamDefaultArgument event for this parameter. 3116void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3117 if (!ParamD) 3118 return; 3119 3120 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3121 3122 // If this parameter has an unparsed default argument, clear it out 3123 // to make way for the parsed default argument. 3124 if (Param->hasUnparsedDefaultArg()) 3125 Param->setDefaultArg(0); 3126 3127 S->AddDecl(Param); 3128 if (Param->getDeclName()) 3129 IdResolver.AddDecl(Param); 3130} 3131 3132/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3133/// processing the delayed method declaration for Method. The method 3134/// declaration is now considered finished. There may be a separate 3135/// ActOnStartOfFunctionDef action later (not necessarily 3136/// immediately!) for this method, if it was also defined inside the 3137/// class body. 3138void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3139 if (!MethodD) 3140 return; 3141 3142 AdjustDeclIfTemplate(MethodD); 3143 3144 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3145 3146 // Now that we have our default arguments, check the constructor 3147 // again. It could produce additional diagnostics or affect whether 3148 // the class has implicitly-declared destructors, among other 3149 // things. 3150 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3151 CheckConstructor(Constructor); 3152 3153 // Check the default arguments, which we may have added. 3154 if (!Method->isInvalidDecl()) 3155 CheckCXXDefaultArguments(Method); 3156} 3157 3158/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3159/// the well-formedness of the constructor declarator @p D with type @p 3160/// R. If there are any errors in the declarator, this routine will 3161/// emit diagnostics and set the invalid bit to true. In any case, the type 3162/// will be updated to reflect a well-formed type for the constructor and 3163/// returned. 3164QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3165 StorageClass &SC) { 3166 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3167 3168 // C++ [class.ctor]p3: 3169 // A constructor shall not be virtual (10.3) or static (9.4). A 3170 // constructor can be invoked for a const, volatile or const 3171 // volatile object. A constructor shall not be declared const, 3172 // volatile, or const volatile (9.3.2). 3173 if (isVirtual) { 3174 if (!D.isInvalidType()) 3175 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3176 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3177 << SourceRange(D.getIdentifierLoc()); 3178 D.setInvalidType(); 3179 } 3180 if (SC == SC_Static) { 3181 if (!D.isInvalidType()) 3182 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3183 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3184 << SourceRange(D.getIdentifierLoc()); 3185 D.setInvalidType(); 3186 SC = SC_None; 3187 } 3188 3189 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3190 if (FTI.TypeQuals != 0) { 3191 if (FTI.TypeQuals & Qualifiers::Const) 3192 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3193 << "const" << SourceRange(D.getIdentifierLoc()); 3194 if (FTI.TypeQuals & Qualifiers::Volatile) 3195 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3196 << "volatile" << SourceRange(D.getIdentifierLoc()); 3197 if (FTI.TypeQuals & Qualifiers::Restrict) 3198 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3199 << "restrict" << SourceRange(D.getIdentifierLoc()); 3200 D.setInvalidType(); 3201 } 3202 3203 // C++0x [class.ctor]p4: 3204 // A constructor shall not be declared with a ref-qualifier. 3205 if (FTI.hasRefQualifier()) { 3206 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3207 << FTI.RefQualifierIsLValueRef 3208 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3209 D.setInvalidType(); 3210 } 3211 3212 // Rebuild the function type "R" without any type qualifiers (in 3213 // case any of the errors above fired) and with "void" as the 3214 // return type, since constructors don't have return types. 3215 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3216 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3217 return R; 3218 3219 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3220 EPI.TypeQuals = 0; 3221 EPI.RefQualifier = RQ_None; 3222 3223 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3224 Proto->getNumArgs(), EPI); 3225} 3226 3227/// CheckConstructor - Checks a fully-formed constructor for 3228/// well-formedness, issuing any diagnostics required. Returns true if 3229/// the constructor declarator is invalid. 3230void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3231 CXXRecordDecl *ClassDecl 3232 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3233 if (!ClassDecl) 3234 return Constructor->setInvalidDecl(); 3235 3236 // C++ [class.copy]p3: 3237 // A declaration of a constructor for a class X is ill-formed if 3238 // its first parameter is of type (optionally cv-qualified) X and 3239 // either there are no other parameters or else all other 3240 // parameters have default arguments. 3241 if (!Constructor->isInvalidDecl() && 3242 ((Constructor->getNumParams() == 1) || 3243 (Constructor->getNumParams() > 1 && 3244 Constructor->getParamDecl(1)->hasDefaultArg())) && 3245 Constructor->getTemplateSpecializationKind() 3246 != TSK_ImplicitInstantiation) { 3247 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3248 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3249 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3250 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3251 const char *ConstRef 3252 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3253 : " const &"; 3254 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3255 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3256 3257 // FIXME: Rather that making the constructor invalid, we should endeavor 3258 // to fix the type. 3259 Constructor->setInvalidDecl(); 3260 } 3261 } 3262} 3263 3264/// CheckDestructor - Checks a fully-formed destructor definition for 3265/// well-formedness, issuing any diagnostics required. Returns true 3266/// on error. 3267bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3268 CXXRecordDecl *RD = Destructor->getParent(); 3269 3270 if (Destructor->isVirtual()) { 3271 SourceLocation Loc; 3272 3273 if (!Destructor->isImplicit()) 3274 Loc = Destructor->getLocation(); 3275 else 3276 Loc = RD->getLocation(); 3277 3278 // If we have a virtual destructor, look up the deallocation function 3279 FunctionDecl *OperatorDelete = 0; 3280 DeclarationName Name = 3281 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3282 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3283 return true; 3284 3285 MarkDeclarationReferenced(Loc, OperatorDelete); 3286 3287 Destructor->setOperatorDelete(OperatorDelete); 3288 } 3289 3290 return false; 3291} 3292 3293static inline bool 3294FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3295 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3296 FTI.ArgInfo[0].Param && 3297 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3298} 3299 3300/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3301/// the well-formednes of the destructor declarator @p D with type @p 3302/// R. If there are any errors in the declarator, this routine will 3303/// emit diagnostics and set the declarator to invalid. Even if this happens, 3304/// will be updated to reflect a well-formed type for the destructor and 3305/// returned. 3306QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3307 StorageClass& SC) { 3308 // C++ [class.dtor]p1: 3309 // [...] A typedef-name that names a class is a class-name 3310 // (7.1.3); however, a typedef-name that names a class shall not 3311 // be used as the identifier in the declarator for a destructor 3312 // declaration. 3313 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3314 if (isa<TypedefType>(DeclaratorType)) 3315 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3316 << DeclaratorType; 3317 3318 // C++ [class.dtor]p2: 3319 // A destructor is used to destroy objects of its class type. A 3320 // destructor takes no parameters, and no return type can be 3321 // specified for it (not even void). The address of a destructor 3322 // shall not be taken. A destructor shall not be static. A 3323 // destructor can be invoked for a const, volatile or const 3324 // volatile object. A destructor shall not be declared const, 3325 // volatile or const volatile (9.3.2). 3326 if (SC == SC_Static) { 3327 if (!D.isInvalidType()) 3328 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3329 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3330 << SourceRange(D.getIdentifierLoc()) 3331 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3332 3333 SC = SC_None; 3334 } 3335 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3336 // Destructors don't have return types, but the parser will 3337 // happily parse something like: 3338 // 3339 // class X { 3340 // float ~X(); 3341 // }; 3342 // 3343 // The return type will be eliminated later. 3344 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3345 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3346 << SourceRange(D.getIdentifierLoc()); 3347 } 3348 3349 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3350 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3351 if (FTI.TypeQuals & Qualifiers::Const) 3352 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3353 << "const" << SourceRange(D.getIdentifierLoc()); 3354 if (FTI.TypeQuals & Qualifiers::Volatile) 3355 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3356 << "volatile" << SourceRange(D.getIdentifierLoc()); 3357 if (FTI.TypeQuals & Qualifiers::Restrict) 3358 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3359 << "restrict" << SourceRange(D.getIdentifierLoc()); 3360 D.setInvalidType(); 3361 } 3362 3363 // C++0x [class.dtor]p2: 3364 // A destructor shall not be declared with a ref-qualifier. 3365 if (FTI.hasRefQualifier()) { 3366 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3367 << FTI.RefQualifierIsLValueRef 3368 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3369 D.setInvalidType(); 3370 } 3371 3372 // Make sure we don't have any parameters. 3373 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3374 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3375 3376 // Delete the parameters. 3377 FTI.freeArgs(); 3378 D.setInvalidType(); 3379 } 3380 3381 // Make sure the destructor isn't variadic. 3382 if (FTI.isVariadic) { 3383 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3384 D.setInvalidType(); 3385 } 3386 3387 // Rebuild the function type "R" without any type qualifiers or 3388 // parameters (in case any of the errors above fired) and with 3389 // "void" as the return type, since destructors don't have return 3390 // types. 3391 if (!D.isInvalidType()) 3392 return R; 3393 3394 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3395 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3396 EPI.Variadic = false; 3397 EPI.TypeQuals = 0; 3398 EPI.RefQualifier = RQ_None; 3399 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3400} 3401 3402/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3403/// well-formednes of the conversion function declarator @p D with 3404/// type @p R. If there are any errors in the declarator, this routine 3405/// will emit diagnostics and return true. Otherwise, it will return 3406/// false. Either way, the type @p R will be updated to reflect a 3407/// well-formed type for the conversion operator. 3408void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3409 StorageClass& SC) { 3410 // C++ [class.conv.fct]p1: 3411 // Neither parameter types nor return type can be specified. The 3412 // type of a conversion function (8.3.5) is "function taking no 3413 // parameter returning conversion-type-id." 3414 if (SC == SC_Static) { 3415 if (!D.isInvalidType()) 3416 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3417 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3418 << SourceRange(D.getIdentifierLoc()); 3419 D.setInvalidType(); 3420 SC = SC_None; 3421 } 3422 3423 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3424 3425 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3426 // Conversion functions don't have return types, but the parser will 3427 // happily parse something like: 3428 // 3429 // class X { 3430 // float operator bool(); 3431 // }; 3432 // 3433 // The return type will be changed later anyway. 3434 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3435 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3436 << SourceRange(D.getIdentifierLoc()); 3437 D.setInvalidType(); 3438 } 3439 3440 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3441 3442 // Make sure we don't have any parameters. 3443 if (Proto->getNumArgs() > 0) { 3444 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3445 3446 // Delete the parameters. 3447 D.getFunctionTypeInfo().freeArgs(); 3448 D.setInvalidType(); 3449 } else if (Proto->isVariadic()) { 3450 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3451 D.setInvalidType(); 3452 } 3453 3454 // Diagnose "&operator bool()" and other such nonsense. This 3455 // is actually a gcc extension which we don't support. 3456 if (Proto->getResultType() != ConvType) { 3457 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3458 << Proto->getResultType(); 3459 D.setInvalidType(); 3460 ConvType = Proto->getResultType(); 3461 } 3462 3463 // C++ [class.conv.fct]p4: 3464 // The conversion-type-id shall not represent a function type nor 3465 // an array type. 3466 if (ConvType->isArrayType()) { 3467 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3468 ConvType = Context.getPointerType(ConvType); 3469 D.setInvalidType(); 3470 } else if (ConvType->isFunctionType()) { 3471 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3472 ConvType = Context.getPointerType(ConvType); 3473 D.setInvalidType(); 3474 } 3475 3476 // Rebuild the function type "R" without any parameters (in case any 3477 // of the errors above fired) and with the conversion type as the 3478 // return type. 3479 if (D.isInvalidType()) 3480 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3481 3482 // C++0x explicit conversion operators. 3483 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3484 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3485 diag::warn_explicit_conversion_functions) 3486 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3487} 3488 3489/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3490/// the declaration of the given C++ conversion function. This routine 3491/// is responsible for recording the conversion function in the C++ 3492/// class, if possible. 3493Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3494 assert(Conversion && "Expected to receive a conversion function declaration"); 3495 3496 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3497 3498 // Make sure we aren't redeclaring the conversion function. 3499 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3500 3501 // C++ [class.conv.fct]p1: 3502 // [...] A conversion function is never used to convert a 3503 // (possibly cv-qualified) object to the (possibly cv-qualified) 3504 // same object type (or a reference to it), to a (possibly 3505 // cv-qualified) base class of that type (or a reference to it), 3506 // or to (possibly cv-qualified) void. 3507 // FIXME: Suppress this warning if the conversion function ends up being a 3508 // virtual function that overrides a virtual function in a base class. 3509 QualType ClassType 3510 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3511 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3512 ConvType = ConvTypeRef->getPointeeType(); 3513 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3514 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3515 /* Suppress diagnostics for instantiations. */; 3516 else if (ConvType->isRecordType()) { 3517 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3518 if (ConvType == ClassType) 3519 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3520 << ClassType; 3521 else if (IsDerivedFrom(ClassType, ConvType)) 3522 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3523 << ClassType << ConvType; 3524 } else if (ConvType->isVoidType()) { 3525 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3526 << ClassType << ConvType; 3527 } 3528 3529 if (FunctionTemplateDecl *ConversionTemplate 3530 = Conversion->getDescribedFunctionTemplate()) 3531 return ConversionTemplate; 3532 3533 return Conversion; 3534} 3535 3536//===----------------------------------------------------------------------===// 3537// Namespace Handling 3538//===----------------------------------------------------------------------===// 3539 3540 3541 3542/// ActOnStartNamespaceDef - This is called at the start of a namespace 3543/// definition. 3544Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3545 SourceLocation InlineLoc, 3546 SourceLocation NamespaceLoc, 3547 SourceLocation IdentLoc, 3548 IdentifierInfo *II, 3549 SourceLocation LBrace, 3550 AttributeList *AttrList) { 3551 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3552 // For anonymous namespace, take the location of the left brace. 3553 SourceLocation Loc = II ? IdentLoc : LBrace; 3554 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3555 StartLoc, Loc, II); 3556 Namespc->setInline(InlineLoc.isValid()); 3557 3558 Scope *DeclRegionScope = NamespcScope->getParent(); 3559 3560 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3561 3562 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3563 PushNamespaceVisibilityAttr(Attr); 3564 3565 if (II) { 3566 // C++ [namespace.def]p2: 3567 // The identifier in an original-namespace-definition shall not 3568 // have been previously defined in the declarative region in 3569 // which the original-namespace-definition appears. The 3570 // identifier in an original-namespace-definition is the name of 3571 // the namespace. Subsequently in that declarative region, it is 3572 // treated as an original-namespace-name. 3573 // 3574 // Since namespace names are unique in their scope, and we don't 3575 // look through using directives, just 3576 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3577 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3578 3579 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3580 // This is an extended namespace definition. 3581 if (Namespc->isInline() != OrigNS->isInline()) { 3582 // inline-ness must match 3583 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3584 << Namespc->isInline(); 3585 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3586 Namespc->setInvalidDecl(); 3587 // Recover by ignoring the new namespace's inline status. 3588 Namespc->setInline(OrigNS->isInline()); 3589 } 3590 3591 // Attach this namespace decl to the chain of extended namespace 3592 // definitions. 3593 OrigNS->setNextNamespace(Namespc); 3594 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3595 3596 // Remove the previous declaration from the scope. 3597 if (DeclRegionScope->isDeclScope(OrigNS)) { 3598 IdResolver.RemoveDecl(OrigNS); 3599 DeclRegionScope->RemoveDecl(OrigNS); 3600 } 3601 } else if (PrevDecl) { 3602 // This is an invalid name redefinition. 3603 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3604 << Namespc->getDeclName(); 3605 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3606 Namespc->setInvalidDecl(); 3607 // Continue on to push Namespc as current DeclContext and return it. 3608 } else if (II->isStr("std") && 3609 CurContext->getRedeclContext()->isTranslationUnit()) { 3610 // This is the first "real" definition of the namespace "std", so update 3611 // our cache of the "std" namespace to point at this definition. 3612 if (NamespaceDecl *StdNS = getStdNamespace()) { 3613 // We had already defined a dummy namespace "std". Link this new 3614 // namespace definition to the dummy namespace "std". 3615 StdNS->setNextNamespace(Namespc); 3616 StdNS->setLocation(IdentLoc); 3617 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3618 } 3619 3620 // Make our StdNamespace cache point at the first real definition of the 3621 // "std" namespace. 3622 StdNamespace = Namespc; 3623 } 3624 3625 PushOnScopeChains(Namespc, DeclRegionScope); 3626 } else { 3627 // Anonymous namespaces. 3628 assert(Namespc->isAnonymousNamespace()); 3629 3630 // Link the anonymous namespace into its parent. 3631 NamespaceDecl *PrevDecl; 3632 DeclContext *Parent = CurContext->getRedeclContext(); 3633 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3634 PrevDecl = TU->getAnonymousNamespace(); 3635 TU->setAnonymousNamespace(Namespc); 3636 } else { 3637 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3638 PrevDecl = ND->getAnonymousNamespace(); 3639 ND->setAnonymousNamespace(Namespc); 3640 } 3641 3642 // Link the anonymous namespace with its previous declaration. 3643 if (PrevDecl) { 3644 assert(PrevDecl->isAnonymousNamespace()); 3645 assert(!PrevDecl->getNextNamespace()); 3646 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3647 PrevDecl->setNextNamespace(Namespc); 3648 3649 if (Namespc->isInline() != PrevDecl->isInline()) { 3650 // inline-ness must match 3651 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3652 << Namespc->isInline(); 3653 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3654 Namespc->setInvalidDecl(); 3655 // Recover by ignoring the new namespace's inline status. 3656 Namespc->setInline(PrevDecl->isInline()); 3657 } 3658 } 3659 3660 CurContext->addDecl(Namespc); 3661 3662 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3663 // behaves as if it were replaced by 3664 // namespace unique { /* empty body */ } 3665 // using namespace unique; 3666 // namespace unique { namespace-body } 3667 // where all occurrences of 'unique' in a translation unit are 3668 // replaced by the same identifier and this identifier differs 3669 // from all other identifiers in the entire program. 3670 3671 // We just create the namespace with an empty name and then add an 3672 // implicit using declaration, just like the standard suggests. 3673 // 3674 // CodeGen enforces the "universally unique" aspect by giving all 3675 // declarations semantically contained within an anonymous 3676 // namespace internal linkage. 3677 3678 if (!PrevDecl) { 3679 UsingDirectiveDecl* UD 3680 = UsingDirectiveDecl::Create(Context, CurContext, 3681 /* 'using' */ LBrace, 3682 /* 'namespace' */ SourceLocation(), 3683 /* qualifier */ NestedNameSpecifierLoc(), 3684 /* identifier */ SourceLocation(), 3685 Namespc, 3686 /* Ancestor */ CurContext); 3687 UD->setImplicit(); 3688 CurContext->addDecl(UD); 3689 } 3690 } 3691 3692 // Although we could have an invalid decl (i.e. the namespace name is a 3693 // redefinition), push it as current DeclContext and try to continue parsing. 3694 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3695 // for the namespace has the declarations that showed up in that particular 3696 // namespace definition. 3697 PushDeclContext(NamespcScope, Namespc); 3698 return Namespc; 3699} 3700 3701/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3702/// is a namespace alias, returns the namespace it points to. 3703static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3704 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3705 return AD->getNamespace(); 3706 return dyn_cast_or_null<NamespaceDecl>(D); 3707} 3708 3709/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3710/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3711void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3712 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3713 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3714 Namespc->setRBraceLoc(RBrace); 3715 PopDeclContext(); 3716 if (Namespc->hasAttr<VisibilityAttr>()) 3717 PopPragmaVisibility(); 3718} 3719 3720CXXRecordDecl *Sema::getStdBadAlloc() const { 3721 return cast_or_null<CXXRecordDecl>( 3722 StdBadAlloc.get(Context.getExternalSource())); 3723} 3724 3725NamespaceDecl *Sema::getStdNamespace() const { 3726 return cast_or_null<NamespaceDecl>( 3727 StdNamespace.get(Context.getExternalSource())); 3728} 3729 3730/// \brief Retrieve the special "std" namespace, which may require us to 3731/// implicitly define the namespace. 3732NamespaceDecl *Sema::getOrCreateStdNamespace() { 3733 if (!StdNamespace) { 3734 // The "std" namespace has not yet been defined, so build one implicitly. 3735 StdNamespace = NamespaceDecl::Create(Context, 3736 Context.getTranslationUnitDecl(), 3737 SourceLocation(), SourceLocation(), 3738 &PP.getIdentifierTable().get("std")); 3739 getStdNamespace()->setImplicit(true); 3740 } 3741 3742 return getStdNamespace(); 3743} 3744 3745Decl *Sema::ActOnUsingDirective(Scope *S, 3746 SourceLocation UsingLoc, 3747 SourceLocation NamespcLoc, 3748 CXXScopeSpec &SS, 3749 SourceLocation IdentLoc, 3750 IdentifierInfo *NamespcName, 3751 AttributeList *AttrList) { 3752 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3753 assert(NamespcName && "Invalid NamespcName."); 3754 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3755 3756 // This can only happen along a recovery path. 3757 while (S->getFlags() & Scope::TemplateParamScope) 3758 S = S->getParent(); 3759 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3760 3761 UsingDirectiveDecl *UDir = 0; 3762 NestedNameSpecifier *Qualifier = 0; 3763 if (SS.isSet()) 3764 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3765 3766 // Lookup namespace name. 3767 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3768 LookupParsedName(R, S, &SS); 3769 if (R.isAmbiguous()) 3770 return 0; 3771 3772 if (R.empty()) { 3773 // Allow "using namespace std;" or "using namespace ::std;" even if 3774 // "std" hasn't been defined yet, for GCC compatibility. 3775 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3776 NamespcName->isStr("std")) { 3777 Diag(IdentLoc, diag::ext_using_undefined_std); 3778 R.addDecl(getOrCreateStdNamespace()); 3779 R.resolveKind(); 3780 } 3781 // Otherwise, attempt typo correction. 3782 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3783 CTC_NoKeywords, 0)) { 3784 if (R.getAsSingle<NamespaceDecl>() || 3785 R.getAsSingle<NamespaceAliasDecl>()) { 3786 if (DeclContext *DC = computeDeclContext(SS, false)) 3787 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3788 << NamespcName << DC << Corrected << SS.getRange() 3789 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3790 else 3791 Diag(IdentLoc, diag::err_using_directive_suggest) 3792 << NamespcName << Corrected 3793 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3794 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3795 << Corrected; 3796 3797 NamespcName = Corrected.getAsIdentifierInfo(); 3798 } else { 3799 R.clear(); 3800 R.setLookupName(NamespcName); 3801 } 3802 } 3803 } 3804 3805 if (!R.empty()) { 3806 NamedDecl *Named = R.getFoundDecl(); 3807 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3808 && "expected namespace decl"); 3809 // C++ [namespace.udir]p1: 3810 // A using-directive specifies that the names in the nominated 3811 // namespace can be used in the scope in which the 3812 // using-directive appears after the using-directive. During 3813 // unqualified name lookup (3.4.1), the names appear as if they 3814 // were declared in the nearest enclosing namespace which 3815 // contains both the using-directive and the nominated 3816 // namespace. [Note: in this context, "contains" means "contains 3817 // directly or indirectly". ] 3818 3819 // Find enclosing context containing both using-directive and 3820 // nominated namespace. 3821 NamespaceDecl *NS = getNamespaceDecl(Named); 3822 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3823 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3824 CommonAncestor = CommonAncestor->getParent(); 3825 3826 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3827 SS.getWithLocInContext(Context), 3828 IdentLoc, Named, CommonAncestor); 3829 PushUsingDirective(S, UDir); 3830 } else { 3831 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3832 } 3833 3834 // FIXME: We ignore attributes for now. 3835 return UDir; 3836} 3837 3838void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3839 // If scope has associated entity, then using directive is at namespace 3840 // or translation unit scope. We add UsingDirectiveDecls, into 3841 // it's lookup structure. 3842 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3843 Ctx->addDecl(UDir); 3844 else 3845 // Otherwise it is block-sope. using-directives will affect lookup 3846 // only to the end of scope. 3847 S->PushUsingDirective(UDir); 3848} 3849 3850 3851Decl *Sema::ActOnUsingDeclaration(Scope *S, 3852 AccessSpecifier AS, 3853 bool HasUsingKeyword, 3854 SourceLocation UsingLoc, 3855 CXXScopeSpec &SS, 3856 UnqualifiedId &Name, 3857 AttributeList *AttrList, 3858 bool IsTypeName, 3859 SourceLocation TypenameLoc) { 3860 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3861 3862 switch (Name.getKind()) { 3863 case UnqualifiedId::IK_Identifier: 3864 case UnqualifiedId::IK_OperatorFunctionId: 3865 case UnqualifiedId::IK_LiteralOperatorId: 3866 case UnqualifiedId::IK_ConversionFunctionId: 3867 break; 3868 3869 case UnqualifiedId::IK_ConstructorName: 3870 case UnqualifiedId::IK_ConstructorTemplateId: 3871 // C++0x inherited constructors. 3872 if (getLangOptions().CPlusPlus0x) break; 3873 3874 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3875 << SS.getRange(); 3876 return 0; 3877 3878 case UnqualifiedId::IK_DestructorName: 3879 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3880 << SS.getRange(); 3881 return 0; 3882 3883 case UnqualifiedId::IK_TemplateId: 3884 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3885 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3886 return 0; 3887 } 3888 3889 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3890 DeclarationName TargetName = TargetNameInfo.getName(); 3891 if (!TargetName) 3892 return 0; 3893 3894 // Warn about using declarations. 3895 // TODO: store that the declaration was written without 'using' and 3896 // talk about access decls instead of using decls in the 3897 // diagnostics. 3898 if (!HasUsingKeyword) { 3899 UsingLoc = Name.getSourceRange().getBegin(); 3900 3901 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3902 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3903 } 3904 3905 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 3906 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 3907 return 0; 3908 3909 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3910 TargetNameInfo, AttrList, 3911 /* IsInstantiation */ false, 3912 IsTypeName, TypenameLoc); 3913 if (UD) 3914 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3915 3916 return UD; 3917} 3918 3919/// \brief Determine whether a using declaration considers the given 3920/// declarations as "equivalent", e.g., if they are redeclarations of 3921/// the same entity or are both typedefs of the same type. 3922static bool 3923IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3924 bool &SuppressRedeclaration) { 3925 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3926 SuppressRedeclaration = false; 3927 return true; 3928 } 3929 3930 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3931 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3932 SuppressRedeclaration = true; 3933 return Context.hasSameType(TD1->getUnderlyingType(), 3934 TD2->getUnderlyingType()); 3935 } 3936 3937 return false; 3938} 3939 3940 3941/// Determines whether to create a using shadow decl for a particular 3942/// decl, given the set of decls existing prior to this using lookup. 3943bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3944 const LookupResult &Previous) { 3945 // Diagnose finding a decl which is not from a base class of the 3946 // current class. We do this now because there are cases where this 3947 // function will silently decide not to build a shadow decl, which 3948 // will pre-empt further diagnostics. 3949 // 3950 // We don't need to do this in C++0x because we do the check once on 3951 // the qualifier. 3952 // 3953 // FIXME: diagnose the following if we care enough: 3954 // struct A { int foo; }; 3955 // struct B : A { using A::foo; }; 3956 // template <class T> struct C : A {}; 3957 // template <class T> struct D : C<T> { using B::foo; } // <--- 3958 // This is invalid (during instantiation) in C++03 because B::foo 3959 // resolves to the using decl in B, which is not a base class of D<T>. 3960 // We can't diagnose it immediately because C<T> is an unknown 3961 // specialization. The UsingShadowDecl in D<T> then points directly 3962 // to A::foo, which will look well-formed when we instantiate. 3963 // The right solution is to not collapse the shadow-decl chain. 3964 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3965 DeclContext *OrigDC = Orig->getDeclContext(); 3966 3967 // Handle enums and anonymous structs. 3968 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3969 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3970 while (OrigRec->isAnonymousStructOrUnion()) 3971 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3972 3973 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3974 if (OrigDC == CurContext) { 3975 Diag(Using->getLocation(), 3976 diag::err_using_decl_nested_name_specifier_is_current_class) 3977 << Using->getQualifierLoc().getSourceRange(); 3978 Diag(Orig->getLocation(), diag::note_using_decl_target); 3979 return true; 3980 } 3981 3982 Diag(Using->getQualifierLoc().getBeginLoc(), 3983 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3984 << Using->getQualifier() 3985 << cast<CXXRecordDecl>(CurContext) 3986 << Using->getQualifierLoc().getSourceRange(); 3987 Diag(Orig->getLocation(), diag::note_using_decl_target); 3988 return true; 3989 } 3990 } 3991 3992 if (Previous.empty()) return false; 3993 3994 NamedDecl *Target = Orig; 3995 if (isa<UsingShadowDecl>(Target)) 3996 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3997 3998 // If the target happens to be one of the previous declarations, we 3999 // don't have a conflict. 4000 // 4001 // FIXME: but we might be increasing its access, in which case we 4002 // should redeclare it. 4003 NamedDecl *NonTag = 0, *Tag = 0; 4004 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4005 I != E; ++I) { 4006 NamedDecl *D = (*I)->getUnderlyingDecl(); 4007 bool Result; 4008 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4009 return Result; 4010 4011 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4012 } 4013 4014 if (Target->isFunctionOrFunctionTemplate()) { 4015 FunctionDecl *FD; 4016 if (isa<FunctionTemplateDecl>(Target)) 4017 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4018 else 4019 FD = cast<FunctionDecl>(Target); 4020 4021 NamedDecl *OldDecl = 0; 4022 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4023 case Ovl_Overload: 4024 return false; 4025 4026 case Ovl_NonFunction: 4027 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4028 break; 4029 4030 // We found a decl with the exact signature. 4031 case Ovl_Match: 4032 // If we're in a record, we want to hide the target, so we 4033 // return true (without a diagnostic) to tell the caller not to 4034 // build a shadow decl. 4035 if (CurContext->isRecord()) 4036 return true; 4037 4038 // If we're not in a record, this is an error. 4039 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4040 break; 4041 } 4042 4043 Diag(Target->getLocation(), diag::note_using_decl_target); 4044 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4045 return true; 4046 } 4047 4048 // Target is not a function. 4049 4050 if (isa<TagDecl>(Target)) { 4051 // No conflict between a tag and a non-tag. 4052 if (!Tag) return false; 4053 4054 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4055 Diag(Target->getLocation(), diag::note_using_decl_target); 4056 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4057 return true; 4058 } 4059 4060 // No conflict between a tag and a non-tag. 4061 if (!NonTag) return false; 4062 4063 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4064 Diag(Target->getLocation(), diag::note_using_decl_target); 4065 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4066 return true; 4067} 4068 4069/// Builds a shadow declaration corresponding to a 'using' declaration. 4070UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4071 UsingDecl *UD, 4072 NamedDecl *Orig) { 4073 4074 // If we resolved to another shadow declaration, just coalesce them. 4075 NamedDecl *Target = Orig; 4076 if (isa<UsingShadowDecl>(Target)) { 4077 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4078 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4079 } 4080 4081 UsingShadowDecl *Shadow 4082 = UsingShadowDecl::Create(Context, CurContext, 4083 UD->getLocation(), UD, Target); 4084 UD->addShadowDecl(Shadow); 4085 4086 Shadow->setAccess(UD->getAccess()); 4087 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4088 Shadow->setInvalidDecl(); 4089 4090 if (S) 4091 PushOnScopeChains(Shadow, S); 4092 else 4093 CurContext->addDecl(Shadow); 4094 4095 4096 return Shadow; 4097} 4098 4099/// Hides a using shadow declaration. This is required by the current 4100/// using-decl implementation when a resolvable using declaration in a 4101/// class is followed by a declaration which would hide or override 4102/// one or more of the using decl's targets; for example: 4103/// 4104/// struct Base { void foo(int); }; 4105/// struct Derived : Base { 4106/// using Base::foo; 4107/// void foo(int); 4108/// }; 4109/// 4110/// The governing language is C++03 [namespace.udecl]p12: 4111/// 4112/// When a using-declaration brings names from a base class into a 4113/// derived class scope, member functions in the derived class 4114/// override and/or hide member functions with the same name and 4115/// parameter types in a base class (rather than conflicting). 4116/// 4117/// There are two ways to implement this: 4118/// (1) optimistically create shadow decls when they're not hidden 4119/// by existing declarations, or 4120/// (2) don't create any shadow decls (or at least don't make them 4121/// visible) until we've fully parsed/instantiated the class. 4122/// The problem with (1) is that we might have to retroactively remove 4123/// a shadow decl, which requires several O(n) operations because the 4124/// decl structures are (very reasonably) not designed for removal. 4125/// (2) avoids this but is very fiddly and phase-dependent. 4126void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4127 if (Shadow->getDeclName().getNameKind() == 4128 DeclarationName::CXXConversionFunctionName) 4129 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4130 4131 // Remove it from the DeclContext... 4132 Shadow->getDeclContext()->removeDecl(Shadow); 4133 4134 // ...and the scope, if applicable... 4135 if (S) { 4136 S->RemoveDecl(Shadow); 4137 IdResolver.RemoveDecl(Shadow); 4138 } 4139 4140 // ...and the using decl. 4141 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4142 4143 // TODO: complain somehow if Shadow was used. It shouldn't 4144 // be possible for this to happen, because...? 4145} 4146 4147/// Builds a using declaration. 4148/// 4149/// \param IsInstantiation - Whether this call arises from an 4150/// instantiation of an unresolved using declaration. We treat 4151/// the lookup differently for these declarations. 4152NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4153 SourceLocation UsingLoc, 4154 CXXScopeSpec &SS, 4155 const DeclarationNameInfo &NameInfo, 4156 AttributeList *AttrList, 4157 bool IsInstantiation, 4158 bool IsTypeName, 4159 SourceLocation TypenameLoc) { 4160 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4161 SourceLocation IdentLoc = NameInfo.getLoc(); 4162 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4163 4164 // FIXME: We ignore attributes for now. 4165 4166 if (SS.isEmpty()) { 4167 Diag(IdentLoc, diag::err_using_requires_qualname); 4168 return 0; 4169 } 4170 4171 // Do the redeclaration lookup in the current scope. 4172 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4173 ForRedeclaration); 4174 Previous.setHideTags(false); 4175 if (S) { 4176 LookupName(Previous, S); 4177 4178 // It is really dumb that we have to do this. 4179 LookupResult::Filter F = Previous.makeFilter(); 4180 while (F.hasNext()) { 4181 NamedDecl *D = F.next(); 4182 if (!isDeclInScope(D, CurContext, S)) 4183 F.erase(); 4184 } 4185 F.done(); 4186 } else { 4187 assert(IsInstantiation && "no scope in non-instantiation"); 4188 assert(CurContext->isRecord() && "scope not record in instantiation"); 4189 LookupQualifiedName(Previous, CurContext); 4190 } 4191 4192 // Check for invalid redeclarations. 4193 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4194 return 0; 4195 4196 // Check for bad qualifiers. 4197 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4198 return 0; 4199 4200 DeclContext *LookupContext = computeDeclContext(SS); 4201 NamedDecl *D; 4202 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4203 if (!LookupContext) { 4204 if (IsTypeName) { 4205 // FIXME: not all declaration name kinds are legal here 4206 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4207 UsingLoc, TypenameLoc, 4208 QualifierLoc, 4209 IdentLoc, NameInfo.getName()); 4210 } else { 4211 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4212 QualifierLoc, NameInfo); 4213 } 4214 } else { 4215 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4216 NameInfo, IsTypeName); 4217 } 4218 D->setAccess(AS); 4219 CurContext->addDecl(D); 4220 4221 if (!LookupContext) return D; 4222 UsingDecl *UD = cast<UsingDecl>(D); 4223 4224 if (RequireCompleteDeclContext(SS, LookupContext)) { 4225 UD->setInvalidDecl(); 4226 return UD; 4227 } 4228 4229 // Constructor inheriting using decls get special treatment. 4230 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4231 if (CheckInheritedConstructorUsingDecl(UD)) 4232 UD->setInvalidDecl(); 4233 return UD; 4234 } 4235 4236 // Otherwise, look up the target name. 4237 4238 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4239 4240 // Unlike most lookups, we don't always want to hide tag 4241 // declarations: tag names are visible through the using declaration 4242 // even if hidden by ordinary names, *except* in a dependent context 4243 // where it's important for the sanity of two-phase lookup. 4244 if (!IsInstantiation) 4245 R.setHideTags(false); 4246 4247 LookupQualifiedName(R, LookupContext); 4248 4249 if (R.empty()) { 4250 Diag(IdentLoc, diag::err_no_member) 4251 << NameInfo.getName() << LookupContext << SS.getRange(); 4252 UD->setInvalidDecl(); 4253 return UD; 4254 } 4255 4256 if (R.isAmbiguous()) { 4257 UD->setInvalidDecl(); 4258 return UD; 4259 } 4260 4261 if (IsTypeName) { 4262 // If we asked for a typename and got a non-type decl, error out. 4263 if (!R.getAsSingle<TypeDecl>()) { 4264 Diag(IdentLoc, diag::err_using_typename_non_type); 4265 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4266 Diag((*I)->getUnderlyingDecl()->getLocation(), 4267 diag::note_using_decl_target); 4268 UD->setInvalidDecl(); 4269 return UD; 4270 } 4271 } else { 4272 // If we asked for a non-typename and we got a type, error out, 4273 // but only if this is an instantiation of an unresolved using 4274 // decl. Otherwise just silently find the type name. 4275 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4276 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4277 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4278 UD->setInvalidDecl(); 4279 return UD; 4280 } 4281 } 4282 4283 // C++0x N2914 [namespace.udecl]p6: 4284 // A using-declaration shall not name a namespace. 4285 if (R.getAsSingle<NamespaceDecl>()) { 4286 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4287 << SS.getRange(); 4288 UD->setInvalidDecl(); 4289 return UD; 4290 } 4291 4292 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4293 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4294 BuildUsingShadowDecl(S, UD, *I); 4295 } 4296 4297 return UD; 4298} 4299 4300/// Additional checks for a using declaration referring to a constructor name. 4301bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4302 if (UD->isTypeName()) { 4303 // FIXME: Cannot specify typename when specifying constructor 4304 return true; 4305 } 4306 4307 const Type *SourceType = UD->getQualifier()->getAsType(); 4308 assert(SourceType && 4309 "Using decl naming constructor doesn't have type in scope spec."); 4310 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4311 4312 // Check whether the named type is a direct base class. 4313 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4314 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4315 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4316 BaseIt != BaseE; ++BaseIt) { 4317 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4318 if (CanonicalSourceType == BaseType) 4319 break; 4320 } 4321 4322 if (BaseIt == BaseE) { 4323 // Did not find SourceType in the bases. 4324 Diag(UD->getUsingLocation(), 4325 diag::err_using_decl_constructor_not_in_direct_base) 4326 << UD->getNameInfo().getSourceRange() 4327 << QualType(SourceType, 0) << TargetClass; 4328 return true; 4329 } 4330 4331 BaseIt->setInheritConstructors(); 4332 4333 return false; 4334} 4335 4336/// Checks that the given using declaration is not an invalid 4337/// redeclaration. Note that this is checking only for the using decl 4338/// itself, not for any ill-formedness among the UsingShadowDecls. 4339bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4340 bool isTypeName, 4341 const CXXScopeSpec &SS, 4342 SourceLocation NameLoc, 4343 const LookupResult &Prev) { 4344 // C++03 [namespace.udecl]p8: 4345 // C++0x [namespace.udecl]p10: 4346 // A using-declaration is a declaration and can therefore be used 4347 // repeatedly where (and only where) multiple declarations are 4348 // allowed. 4349 // 4350 // That's in non-member contexts. 4351 if (!CurContext->getRedeclContext()->isRecord()) 4352 return false; 4353 4354 NestedNameSpecifier *Qual 4355 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4356 4357 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4358 NamedDecl *D = *I; 4359 4360 bool DTypename; 4361 NestedNameSpecifier *DQual; 4362 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4363 DTypename = UD->isTypeName(); 4364 DQual = UD->getQualifier(); 4365 } else if (UnresolvedUsingValueDecl *UD 4366 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4367 DTypename = false; 4368 DQual = UD->getQualifier(); 4369 } else if (UnresolvedUsingTypenameDecl *UD 4370 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4371 DTypename = true; 4372 DQual = UD->getQualifier(); 4373 } else continue; 4374 4375 // using decls differ if one says 'typename' and the other doesn't. 4376 // FIXME: non-dependent using decls? 4377 if (isTypeName != DTypename) continue; 4378 4379 // using decls differ if they name different scopes (but note that 4380 // template instantiation can cause this check to trigger when it 4381 // didn't before instantiation). 4382 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4383 Context.getCanonicalNestedNameSpecifier(DQual)) 4384 continue; 4385 4386 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4387 Diag(D->getLocation(), diag::note_using_decl) << 1; 4388 return true; 4389 } 4390 4391 return false; 4392} 4393 4394 4395/// Checks that the given nested-name qualifier used in a using decl 4396/// in the current context is appropriately related to the current 4397/// scope. If an error is found, diagnoses it and returns true. 4398bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4399 const CXXScopeSpec &SS, 4400 SourceLocation NameLoc) { 4401 DeclContext *NamedContext = computeDeclContext(SS); 4402 4403 if (!CurContext->isRecord()) { 4404 // C++03 [namespace.udecl]p3: 4405 // C++0x [namespace.udecl]p8: 4406 // A using-declaration for a class member shall be a member-declaration. 4407 4408 // If we weren't able to compute a valid scope, it must be a 4409 // dependent class scope. 4410 if (!NamedContext || NamedContext->isRecord()) { 4411 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4412 << SS.getRange(); 4413 return true; 4414 } 4415 4416 // Otherwise, everything is known to be fine. 4417 return false; 4418 } 4419 4420 // The current scope is a record. 4421 4422 // If the named context is dependent, we can't decide much. 4423 if (!NamedContext) { 4424 // FIXME: in C++0x, we can diagnose if we can prove that the 4425 // nested-name-specifier does not refer to a base class, which is 4426 // still possible in some cases. 4427 4428 // Otherwise we have to conservatively report that things might be 4429 // okay. 4430 return false; 4431 } 4432 4433 if (!NamedContext->isRecord()) { 4434 // Ideally this would point at the last name in the specifier, 4435 // but we don't have that level of source info. 4436 Diag(SS.getRange().getBegin(), 4437 diag::err_using_decl_nested_name_specifier_is_not_class) 4438 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4439 return true; 4440 } 4441 4442 if (!NamedContext->isDependentContext() && 4443 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4444 return true; 4445 4446 if (getLangOptions().CPlusPlus0x) { 4447 // C++0x [namespace.udecl]p3: 4448 // In a using-declaration used as a member-declaration, the 4449 // nested-name-specifier shall name a base class of the class 4450 // being defined. 4451 4452 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4453 cast<CXXRecordDecl>(NamedContext))) { 4454 if (CurContext == NamedContext) { 4455 Diag(NameLoc, 4456 diag::err_using_decl_nested_name_specifier_is_current_class) 4457 << SS.getRange(); 4458 return true; 4459 } 4460 4461 Diag(SS.getRange().getBegin(), 4462 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4463 << (NestedNameSpecifier*) SS.getScopeRep() 4464 << cast<CXXRecordDecl>(CurContext) 4465 << SS.getRange(); 4466 return true; 4467 } 4468 4469 return false; 4470 } 4471 4472 // C++03 [namespace.udecl]p4: 4473 // A using-declaration used as a member-declaration shall refer 4474 // to a member of a base class of the class being defined [etc.]. 4475 4476 // Salient point: SS doesn't have to name a base class as long as 4477 // lookup only finds members from base classes. Therefore we can 4478 // diagnose here only if we can prove that that can't happen, 4479 // i.e. if the class hierarchies provably don't intersect. 4480 4481 // TODO: it would be nice if "definitely valid" results were cached 4482 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4483 // need to be repeated. 4484 4485 struct UserData { 4486 llvm::DenseSet<const CXXRecordDecl*> Bases; 4487 4488 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4489 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4490 Data->Bases.insert(Base); 4491 return true; 4492 } 4493 4494 bool hasDependentBases(const CXXRecordDecl *Class) { 4495 return !Class->forallBases(collect, this); 4496 } 4497 4498 /// Returns true if the base is dependent or is one of the 4499 /// accumulated base classes. 4500 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4501 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4502 return !Data->Bases.count(Base); 4503 } 4504 4505 bool mightShareBases(const CXXRecordDecl *Class) { 4506 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4507 } 4508 }; 4509 4510 UserData Data; 4511 4512 // Returns false if we find a dependent base. 4513 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4514 return false; 4515 4516 // Returns false if the class has a dependent base or if it or one 4517 // of its bases is present in the base set of the current context. 4518 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4519 return false; 4520 4521 Diag(SS.getRange().getBegin(), 4522 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4523 << (NestedNameSpecifier*) SS.getScopeRep() 4524 << cast<CXXRecordDecl>(CurContext) 4525 << SS.getRange(); 4526 4527 return true; 4528} 4529 4530Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4531 SourceLocation NamespaceLoc, 4532 SourceLocation AliasLoc, 4533 IdentifierInfo *Alias, 4534 CXXScopeSpec &SS, 4535 SourceLocation IdentLoc, 4536 IdentifierInfo *Ident) { 4537 4538 // Lookup the namespace name. 4539 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4540 LookupParsedName(R, S, &SS); 4541 4542 // Check if we have a previous declaration with the same name. 4543 NamedDecl *PrevDecl 4544 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4545 ForRedeclaration); 4546 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4547 PrevDecl = 0; 4548 4549 if (PrevDecl) { 4550 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4551 // We already have an alias with the same name that points to the same 4552 // namespace, so don't create a new one. 4553 // FIXME: At some point, we'll want to create the (redundant) 4554 // declaration to maintain better source information. 4555 if (!R.isAmbiguous() && !R.empty() && 4556 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4557 return 0; 4558 } 4559 4560 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4561 diag::err_redefinition_different_kind; 4562 Diag(AliasLoc, DiagID) << Alias; 4563 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4564 return 0; 4565 } 4566 4567 if (R.isAmbiguous()) 4568 return 0; 4569 4570 if (R.empty()) { 4571 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4572 CTC_NoKeywords, 0)) { 4573 if (R.getAsSingle<NamespaceDecl>() || 4574 R.getAsSingle<NamespaceAliasDecl>()) { 4575 if (DeclContext *DC = computeDeclContext(SS, false)) 4576 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4577 << Ident << DC << Corrected << SS.getRange() 4578 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4579 else 4580 Diag(IdentLoc, diag::err_using_directive_suggest) 4581 << Ident << Corrected 4582 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4583 4584 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4585 << Corrected; 4586 4587 Ident = Corrected.getAsIdentifierInfo(); 4588 } else { 4589 R.clear(); 4590 R.setLookupName(Ident); 4591 } 4592 } 4593 4594 if (R.empty()) { 4595 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4596 return 0; 4597 } 4598 } 4599 4600 NamespaceAliasDecl *AliasDecl = 4601 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4602 Alias, SS.getWithLocInContext(Context), 4603 IdentLoc, R.getFoundDecl()); 4604 4605 PushOnScopeChains(AliasDecl, S); 4606 return AliasDecl; 4607} 4608 4609namespace { 4610 /// \brief Scoped object used to handle the state changes required in Sema 4611 /// to implicitly define the body of a C++ member function; 4612 class ImplicitlyDefinedFunctionScope { 4613 Sema &S; 4614 Sema::ContextRAII SavedContext; 4615 4616 public: 4617 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4618 : S(S), SavedContext(S, Method) 4619 { 4620 S.PushFunctionScope(); 4621 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4622 } 4623 4624 ~ImplicitlyDefinedFunctionScope() { 4625 S.PopExpressionEvaluationContext(); 4626 S.PopFunctionOrBlockScope(); 4627 } 4628 }; 4629} 4630 4631static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4632 CXXRecordDecl *D) { 4633 ASTContext &Context = Self.Context; 4634 QualType ClassType = Context.getTypeDeclType(D); 4635 DeclarationName ConstructorName 4636 = Context.DeclarationNames.getCXXConstructorName( 4637 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4638 4639 DeclContext::lookup_const_iterator Con, ConEnd; 4640 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4641 Con != ConEnd; ++Con) { 4642 // FIXME: In C++0x, a constructor template can be a default constructor. 4643 if (isa<FunctionTemplateDecl>(*Con)) 4644 continue; 4645 4646 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4647 if (Constructor->isDefaultConstructor()) 4648 return Constructor; 4649 } 4650 return 0; 4651} 4652 4653CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4654 CXXRecordDecl *ClassDecl) { 4655 // C++ [class.ctor]p5: 4656 // A default constructor for a class X is a constructor of class X 4657 // that can be called without an argument. If there is no 4658 // user-declared constructor for class X, a default constructor is 4659 // implicitly declared. An implicitly-declared default constructor 4660 // is an inline public member of its class. 4661 assert(!ClassDecl->hasUserDeclaredConstructor() && 4662 "Should not build implicit default constructor!"); 4663 4664 // C++ [except.spec]p14: 4665 // An implicitly declared special member function (Clause 12) shall have an 4666 // exception-specification. [...] 4667 ImplicitExceptionSpecification ExceptSpec(Context); 4668 4669 // Direct base-class destructors. 4670 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4671 BEnd = ClassDecl->bases_end(); 4672 B != BEnd; ++B) { 4673 if (B->isVirtual()) // Handled below. 4674 continue; 4675 4676 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4677 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4678 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4679 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4680 else if (CXXConstructorDecl *Constructor 4681 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4682 ExceptSpec.CalledDecl(Constructor); 4683 } 4684 } 4685 4686 // Virtual base-class destructors. 4687 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4688 BEnd = ClassDecl->vbases_end(); 4689 B != BEnd; ++B) { 4690 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4691 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4692 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4693 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4694 else if (CXXConstructorDecl *Constructor 4695 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4696 ExceptSpec.CalledDecl(Constructor); 4697 } 4698 } 4699 4700 // Field destructors. 4701 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4702 FEnd = ClassDecl->field_end(); 4703 F != FEnd; ++F) { 4704 if (const RecordType *RecordTy 4705 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4706 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4707 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4708 ExceptSpec.CalledDecl( 4709 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4710 else if (CXXConstructorDecl *Constructor 4711 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4712 ExceptSpec.CalledDecl(Constructor); 4713 } 4714 } 4715 4716 FunctionProtoType::ExtProtoInfo EPI; 4717 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 4718 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 4719 EST_None; 4720 EPI.NumExceptions = ExceptSpec.size(); 4721 EPI.Exceptions = ExceptSpec.data(); 4722 4723 // Create the actual constructor declaration. 4724 CanQualType ClassType 4725 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4726 SourceLocation ClassLoc = ClassDecl->getLocation(); 4727 DeclarationName Name 4728 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4729 DeclarationNameInfo NameInfo(Name, ClassLoc); 4730 CXXConstructorDecl *DefaultCon 4731 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4732 Context.getFunctionType(Context.VoidTy, 4733 0, 0, EPI), 4734 /*TInfo=*/0, 4735 /*isExplicit=*/false, 4736 /*isInline=*/true, 4737 /*isImplicitlyDeclared=*/true); 4738 DefaultCon->setAccess(AS_public); 4739 DefaultCon->setImplicit(); 4740 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4741 4742 // Note that we have declared this constructor. 4743 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4744 4745 if (Scope *S = getScopeForContext(ClassDecl)) 4746 PushOnScopeChains(DefaultCon, S, false); 4747 ClassDecl->addDecl(DefaultCon); 4748 4749 return DefaultCon; 4750} 4751 4752void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4753 CXXConstructorDecl *Constructor) { 4754 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4755 !Constructor->isUsed(false)) && 4756 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4757 4758 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4759 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4760 4761 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4762 DiagnosticErrorTrap Trap(Diags); 4763 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4764 Trap.hasErrorOccurred()) { 4765 Diag(CurrentLocation, diag::note_member_synthesized_at) 4766 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4767 Constructor->setInvalidDecl(); 4768 return; 4769 } 4770 4771 SourceLocation Loc = Constructor->getLocation(); 4772 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4773 4774 Constructor->setUsed(); 4775 MarkVTableUsed(CurrentLocation, ClassDecl); 4776} 4777 4778void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4779 // We start with an initial pass over the base classes to collect those that 4780 // inherit constructors from. If there are none, we can forgo all further 4781 // processing. 4782 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4783 BasesVector BasesToInheritFrom; 4784 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4785 BaseE = ClassDecl->bases_end(); 4786 BaseIt != BaseE; ++BaseIt) { 4787 if (BaseIt->getInheritConstructors()) { 4788 QualType Base = BaseIt->getType(); 4789 if (Base->isDependentType()) { 4790 // If we inherit constructors from anything that is dependent, just 4791 // abort processing altogether. We'll get another chance for the 4792 // instantiations. 4793 return; 4794 } 4795 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4796 } 4797 } 4798 if (BasesToInheritFrom.empty()) 4799 return; 4800 4801 // Now collect the constructors that we already have in the current class. 4802 // Those take precedence over inherited constructors. 4803 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 4804 // unless there is a user-declared constructor with the same signature in 4805 // the class where the using-declaration appears. 4806 llvm::SmallSet<const Type *, 8> ExistingConstructors; 4807 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 4808 CtorE = ClassDecl->ctor_end(); 4809 CtorIt != CtorE; ++CtorIt) { 4810 ExistingConstructors.insert( 4811 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 4812 } 4813 4814 Scope *S = getScopeForContext(ClassDecl); 4815 DeclarationName CreatedCtorName = 4816 Context.DeclarationNames.getCXXConstructorName( 4817 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 4818 4819 // Now comes the true work. 4820 // First, we keep a map from constructor types to the base that introduced 4821 // them. Needed for finding conflicting constructors. We also keep the 4822 // actually inserted declarations in there, for pretty diagnostics. 4823 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 4824 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 4825 ConstructorToSourceMap InheritedConstructors; 4826 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 4827 BaseE = BasesToInheritFrom.end(); 4828 BaseIt != BaseE; ++BaseIt) { 4829 const RecordType *Base = *BaseIt; 4830 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 4831 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 4832 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 4833 CtorE = BaseDecl->ctor_end(); 4834 CtorIt != CtorE; ++CtorIt) { 4835 // Find the using declaration for inheriting this base's constructors. 4836 DeclarationName Name = 4837 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 4838 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 4839 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 4840 SourceLocation UsingLoc = UD ? UD->getLocation() : 4841 ClassDecl->getLocation(); 4842 4843 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 4844 // from the class X named in the using-declaration consists of actual 4845 // constructors and notional constructors that result from the 4846 // transformation of defaulted parameters as follows: 4847 // - all non-template default constructors of X, and 4848 // - for each non-template constructor of X that has at least one 4849 // parameter with a default argument, the set of constructors that 4850 // results from omitting any ellipsis parameter specification and 4851 // successively omitting parameters with a default argument from the 4852 // end of the parameter-type-list. 4853 CXXConstructorDecl *BaseCtor = *CtorIt; 4854 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 4855 const FunctionProtoType *BaseCtorType = 4856 BaseCtor->getType()->getAs<FunctionProtoType>(); 4857 4858 for (unsigned params = BaseCtor->getMinRequiredArguments(), 4859 maxParams = BaseCtor->getNumParams(); 4860 params <= maxParams; ++params) { 4861 // Skip default constructors. They're never inherited. 4862 if (params == 0) 4863 continue; 4864 // Skip copy and move constructors for the same reason. 4865 if (CanBeCopyOrMove && params == 1) 4866 continue; 4867 4868 // Build up a function type for this particular constructor. 4869 // FIXME: The working paper does not consider that the exception spec 4870 // for the inheriting constructor might be larger than that of the 4871 // source. This code doesn't yet, either. 4872 const Type *NewCtorType; 4873 if (params == maxParams) 4874 NewCtorType = BaseCtorType; 4875 else { 4876 llvm::SmallVector<QualType, 16> Args; 4877 for (unsigned i = 0; i < params; ++i) { 4878 Args.push_back(BaseCtorType->getArgType(i)); 4879 } 4880 FunctionProtoType::ExtProtoInfo ExtInfo = 4881 BaseCtorType->getExtProtoInfo(); 4882 ExtInfo.Variadic = false; 4883 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 4884 Args.data(), params, ExtInfo) 4885 .getTypePtr(); 4886 } 4887 const Type *CanonicalNewCtorType = 4888 Context.getCanonicalType(NewCtorType); 4889 4890 // Now that we have the type, first check if the class already has a 4891 // constructor with this signature. 4892 if (ExistingConstructors.count(CanonicalNewCtorType)) 4893 continue; 4894 4895 // Then we check if we have already declared an inherited constructor 4896 // with this signature. 4897 std::pair<ConstructorToSourceMap::iterator, bool> result = 4898 InheritedConstructors.insert(std::make_pair( 4899 CanonicalNewCtorType, 4900 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 4901 if (!result.second) { 4902 // Already in the map. If it came from a different class, that's an 4903 // error. Not if it's from the same. 4904 CanQualType PreviousBase = result.first->second.first; 4905 if (CanonicalBase != PreviousBase) { 4906 const CXXConstructorDecl *PrevCtor = result.first->second.second; 4907 const CXXConstructorDecl *PrevBaseCtor = 4908 PrevCtor->getInheritedConstructor(); 4909 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 4910 4911 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 4912 Diag(BaseCtor->getLocation(), 4913 diag::note_using_decl_constructor_conflict_current_ctor); 4914 Diag(PrevBaseCtor->getLocation(), 4915 diag::note_using_decl_constructor_conflict_previous_ctor); 4916 Diag(PrevCtor->getLocation(), 4917 diag::note_using_decl_constructor_conflict_previous_using); 4918 } 4919 continue; 4920 } 4921 4922 // OK, we're there, now add the constructor. 4923 // C++0x [class.inhctor]p8: [...] that would be performed by a 4924 // user-writtern inline constructor [...] 4925 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 4926 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 4927 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 4928 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 4929 /*ImplicitlyDeclared=*/true); 4930 NewCtor->setAccess(BaseCtor->getAccess()); 4931 4932 // Build up the parameter decls and add them. 4933 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 4934 for (unsigned i = 0; i < params; ++i) { 4935 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 4936 UsingLoc, UsingLoc, 4937 /*IdentifierInfo=*/0, 4938 BaseCtorType->getArgType(i), 4939 /*TInfo=*/0, SC_None, 4940 SC_None, /*DefaultArg=*/0)); 4941 } 4942 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 4943 NewCtor->setInheritedConstructor(BaseCtor); 4944 4945 PushOnScopeChains(NewCtor, S, false); 4946 ClassDecl->addDecl(NewCtor); 4947 result.first->second.second = NewCtor; 4948 } 4949 } 4950 } 4951} 4952 4953CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4954 // C++ [class.dtor]p2: 4955 // If a class has no user-declared destructor, a destructor is 4956 // declared implicitly. An implicitly-declared destructor is an 4957 // inline public member of its class. 4958 4959 // C++ [except.spec]p14: 4960 // An implicitly declared special member function (Clause 12) shall have 4961 // an exception-specification. 4962 ImplicitExceptionSpecification ExceptSpec(Context); 4963 4964 // Direct base-class destructors. 4965 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4966 BEnd = ClassDecl->bases_end(); 4967 B != BEnd; ++B) { 4968 if (B->isVirtual()) // Handled below. 4969 continue; 4970 4971 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4972 ExceptSpec.CalledDecl( 4973 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4974 } 4975 4976 // Virtual base-class destructors. 4977 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4978 BEnd = ClassDecl->vbases_end(); 4979 B != BEnd; ++B) { 4980 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4981 ExceptSpec.CalledDecl( 4982 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4983 } 4984 4985 // Field destructors. 4986 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4987 FEnd = ClassDecl->field_end(); 4988 F != FEnd; ++F) { 4989 if (const RecordType *RecordTy 4990 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4991 ExceptSpec.CalledDecl( 4992 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4993 } 4994 4995 // Create the actual destructor declaration. 4996 FunctionProtoType::ExtProtoInfo EPI; 4997 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 4998 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 4999 EST_None; 5000 EPI.NumExceptions = ExceptSpec.size(); 5001 EPI.Exceptions = ExceptSpec.data(); 5002 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5003 5004 CanQualType ClassType 5005 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5006 SourceLocation ClassLoc = ClassDecl->getLocation(); 5007 DeclarationName Name 5008 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5009 DeclarationNameInfo NameInfo(Name, ClassLoc); 5010 CXXDestructorDecl *Destructor 5011 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5012 /*isInline=*/true, 5013 /*isImplicitlyDeclared=*/true); 5014 Destructor->setAccess(AS_public); 5015 Destructor->setImplicit(); 5016 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5017 5018 // Note that we have declared this destructor. 5019 ++ASTContext::NumImplicitDestructorsDeclared; 5020 5021 // Introduce this destructor into its scope. 5022 if (Scope *S = getScopeForContext(ClassDecl)) 5023 PushOnScopeChains(Destructor, S, false); 5024 ClassDecl->addDecl(Destructor); 5025 5026 // This could be uniqued if it ever proves significant. 5027 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5028 5029 AddOverriddenMethods(ClassDecl, Destructor); 5030 5031 return Destructor; 5032} 5033 5034void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5035 CXXDestructorDecl *Destructor) { 5036 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5037 "DefineImplicitDestructor - call it for implicit default dtor"); 5038 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5039 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5040 5041 if (Destructor->isInvalidDecl()) 5042 return; 5043 5044 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5045 5046 DiagnosticErrorTrap Trap(Diags); 5047 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5048 Destructor->getParent()); 5049 5050 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5051 Diag(CurrentLocation, diag::note_member_synthesized_at) 5052 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5053 5054 Destructor->setInvalidDecl(); 5055 return; 5056 } 5057 5058 SourceLocation Loc = Destructor->getLocation(); 5059 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5060 5061 Destructor->setUsed(); 5062 MarkVTableUsed(CurrentLocation, ClassDecl); 5063} 5064 5065/// \brief Builds a statement that copies the given entity from \p From to 5066/// \c To. 5067/// 5068/// This routine is used to copy the members of a class with an 5069/// implicitly-declared copy assignment operator. When the entities being 5070/// copied are arrays, this routine builds for loops to copy them. 5071/// 5072/// \param S The Sema object used for type-checking. 5073/// 5074/// \param Loc The location where the implicit copy is being generated. 5075/// 5076/// \param T The type of the expressions being copied. Both expressions must 5077/// have this type. 5078/// 5079/// \param To The expression we are copying to. 5080/// 5081/// \param From The expression we are copying from. 5082/// 5083/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5084/// Otherwise, it's a non-static member subobject. 5085/// 5086/// \param Depth Internal parameter recording the depth of the recursion. 5087/// 5088/// \returns A statement or a loop that copies the expressions. 5089static StmtResult 5090BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5091 Expr *To, Expr *From, 5092 bool CopyingBaseSubobject, unsigned Depth = 0) { 5093 // C++0x [class.copy]p30: 5094 // Each subobject is assigned in the manner appropriate to its type: 5095 // 5096 // - if the subobject is of class type, the copy assignment operator 5097 // for the class is used (as if by explicit qualification; that is, 5098 // ignoring any possible virtual overriding functions in more derived 5099 // classes); 5100 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5101 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5102 5103 // Look for operator=. 5104 DeclarationName Name 5105 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5106 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5107 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5108 5109 // Filter out any result that isn't a copy-assignment operator. 5110 LookupResult::Filter F = OpLookup.makeFilter(); 5111 while (F.hasNext()) { 5112 NamedDecl *D = F.next(); 5113 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5114 if (Method->isCopyAssignmentOperator()) 5115 continue; 5116 5117 F.erase(); 5118 } 5119 F.done(); 5120 5121 // Suppress the protected check (C++ [class.protected]) for each of the 5122 // assignment operators we found. This strange dance is required when 5123 // we're assigning via a base classes's copy-assignment operator. To 5124 // ensure that we're getting the right base class subobject (without 5125 // ambiguities), we need to cast "this" to that subobject type; to 5126 // ensure that we don't go through the virtual call mechanism, we need 5127 // to qualify the operator= name with the base class (see below). However, 5128 // this means that if the base class has a protected copy assignment 5129 // operator, the protected member access check will fail. So, we 5130 // rewrite "protected" access to "public" access in this case, since we 5131 // know by construction that we're calling from a derived class. 5132 if (CopyingBaseSubobject) { 5133 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5134 L != LEnd; ++L) { 5135 if (L.getAccess() == AS_protected) 5136 L.setAccess(AS_public); 5137 } 5138 } 5139 5140 // Create the nested-name-specifier that will be used to qualify the 5141 // reference to operator=; this is required to suppress the virtual 5142 // call mechanism. 5143 CXXScopeSpec SS; 5144 SS.MakeTrivial(S.Context, 5145 NestedNameSpecifier::Create(S.Context, 0, false, 5146 T.getTypePtr()), 5147 Loc); 5148 5149 // Create the reference to operator=. 5150 ExprResult OpEqualRef 5151 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5152 /*FirstQualifierInScope=*/0, OpLookup, 5153 /*TemplateArgs=*/0, 5154 /*SuppressQualifierCheck=*/true); 5155 if (OpEqualRef.isInvalid()) 5156 return StmtError(); 5157 5158 // Build the call to the assignment operator. 5159 5160 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5161 OpEqualRef.takeAs<Expr>(), 5162 Loc, &From, 1, Loc); 5163 if (Call.isInvalid()) 5164 return StmtError(); 5165 5166 return S.Owned(Call.takeAs<Stmt>()); 5167 } 5168 5169 // - if the subobject is of scalar type, the built-in assignment 5170 // operator is used. 5171 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5172 if (!ArrayTy) { 5173 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5174 if (Assignment.isInvalid()) 5175 return StmtError(); 5176 5177 return S.Owned(Assignment.takeAs<Stmt>()); 5178 } 5179 5180 // - if the subobject is an array, each element is assigned, in the 5181 // manner appropriate to the element type; 5182 5183 // Construct a loop over the array bounds, e.g., 5184 // 5185 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5186 // 5187 // that will copy each of the array elements. 5188 QualType SizeType = S.Context.getSizeType(); 5189 5190 // Create the iteration variable. 5191 IdentifierInfo *IterationVarName = 0; 5192 { 5193 llvm::SmallString<8> Str; 5194 llvm::raw_svector_ostream OS(Str); 5195 OS << "__i" << Depth; 5196 IterationVarName = &S.Context.Idents.get(OS.str()); 5197 } 5198 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5199 IterationVarName, SizeType, 5200 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5201 SC_None, SC_None); 5202 5203 // Initialize the iteration variable to zero. 5204 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5205 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5206 5207 // Create a reference to the iteration variable; we'll use this several 5208 // times throughout. 5209 Expr *IterationVarRef 5210 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5211 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5212 5213 // Create the DeclStmt that holds the iteration variable. 5214 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5215 5216 // Create the comparison against the array bound. 5217 llvm::APInt Upper 5218 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5219 Expr *Comparison 5220 = new (S.Context) BinaryOperator(IterationVarRef, 5221 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5222 BO_NE, S.Context.BoolTy, 5223 VK_RValue, OK_Ordinary, Loc); 5224 5225 // Create the pre-increment of the iteration variable. 5226 Expr *Increment 5227 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5228 VK_LValue, OK_Ordinary, Loc); 5229 5230 // Subscript the "from" and "to" expressions with the iteration variable. 5231 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5232 IterationVarRef, Loc)); 5233 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5234 IterationVarRef, Loc)); 5235 5236 // Build the copy for an individual element of the array. 5237 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5238 To, From, CopyingBaseSubobject, 5239 Depth + 1); 5240 if (Copy.isInvalid()) 5241 return StmtError(); 5242 5243 // Construct the loop that copies all elements of this array. 5244 return S.ActOnForStmt(Loc, Loc, InitStmt, 5245 S.MakeFullExpr(Comparison), 5246 0, S.MakeFullExpr(Increment), 5247 Loc, Copy.take()); 5248} 5249 5250/// \brief Determine whether the given class has a copy assignment operator 5251/// that accepts a const-qualified argument. 5252static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5253 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5254 5255 if (!Class->hasDeclaredCopyAssignment()) 5256 S.DeclareImplicitCopyAssignment(Class); 5257 5258 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5259 DeclarationName OpName 5260 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5261 5262 DeclContext::lookup_const_iterator Op, OpEnd; 5263 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5264 // C++ [class.copy]p9: 5265 // A user-declared copy assignment operator is a non-static non-template 5266 // member function of class X with exactly one parameter of type X, X&, 5267 // const X&, volatile X& or const volatile X&. 5268 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5269 if (!Method) 5270 continue; 5271 5272 if (Method->isStatic()) 5273 continue; 5274 if (Method->getPrimaryTemplate()) 5275 continue; 5276 const FunctionProtoType *FnType = 5277 Method->getType()->getAs<FunctionProtoType>(); 5278 assert(FnType && "Overloaded operator has no prototype."); 5279 // Don't assert on this; an invalid decl might have been left in the AST. 5280 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5281 continue; 5282 bool AcceptsConst = true; 5283 QualType ArgType = FnType->getArgType(0); 5284 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5285 ArgType = Ref->getPointeeType(); 5286 // Is it a non-const lvalue reference? 5287 if (!ArgType.isConstQualified()) 5288 AcceptsConst = false; 5289 } 5290 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5291 continue; 5292 5293 // We have a single argument of type cv X or cv X&, i.e. we've found the 5294 // copy assignment operator. Return whether it accepts const arguments. 5295 return AcceptsConst; 5296 } 5297 assert(Class->isInvalidDecl() && 5298 "No copy assignment operator declared in valid code."); 5299 return false; 5300} 5301 5302CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5303 // Note: The following rules are largely analoguous to the copy 5304 // constructor rules. Note that virtual bases are not taken into account 5305 // for determining the argument type of the operator. Note also that 5306 // operators taking an object instead of a reference are allowed. 5307 5308 5309 // C++ [class.copy]p10: 5310 // If the class definition does not explicitly declare a copy 5311 // assignment operator, one is declared implicitly. 5312 // The implicitly-defined copy assignment operator for a class X 5313 // will have the form 5314 // 5315 // X& X::operator=(const X&) 5316 // 5317 // if 5318 bool HasConstCopyAssignment = true; 5319 5320 // -- each direct base class B of X has a copy assignment operator 5321 // whose parameter is of type const B&, const volatile B& or B, 5322 // and 5323 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5324 BaseEnd = ClassDecl->bases_end(); 5325 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5326 assert(!Base->getType()->isDependentType() && 5327 "Cannot generate implicit members for class with dependent bases."); 5328 const CXXRecordDecl *BaseClassDecl 5329 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5330 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5331 } 5332 5333 // -- for all the nonstatic data members of X that are of a class 5334 // type M (or array thereof), each such class type has a copy 5335 // assignment operator whose parameter is of type const M&, 5336 // const volatile M& or M. 5337 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5338 FieldEnd = ClassDecl->field_end(); 5339 HasConstCopyAssignment && Field != FieldEnd; 5340 ++Field) { 5341 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5342 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5343 const CXXRecordDecl *FieldClassDecl 5344 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5345 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5346 } 5347 } 5348 5349 // Otherwise, the implicitly declared copy assignment operator will 5350 // have the form 5351 // 5352 // X& X::operator=(X&) 5353 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5354 QualType RetType = Context.getLValueReferenceType(ArgType); 5355 if (HasConstCopyAssignment) 5356 ArgType = ArgType.withConst(); 5357 ArgType = Context.getLValueReferenceType(ArgType); 5358 5359 // C++ [except.spec]p14: 5360 // An implicitly declared special member function (Clause 12) shall have an 5361 // exception-specification. [...] 5362 ImplicitExceptionSpecification ExceptSpec(Context); 5363 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5364 BaseEnd = ClassDecl->bases_end(); 5365 Base != BaseEnd; ++Base) { 5366 CXXRecordDecl *BaseClassDecl 5367 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5368 5369 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5370 DeclareImplicitCopyAssignment(BaseClassDecl); 5371 5372 if (CXXMethodDecl *CopyAssign 5373 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5374 ExceptSpec.CalledDecl(CopyAssign); 5375 } 5376 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5377 FieldEnd = ClassDecl->field_end(); 5378 Field != FieldEnd; 5379 ++Field) { 5380 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5381 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5382 CXXRecordDecl *FieldClassDecl 5383 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5384 5385 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5386 DeclareImplicitCopyAssignment(FieldClassDecl); 5387 5388 if (CXXMethodDecl *CopyAssign 5389 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5390 ExceptSpec.CalledDecl(CopyAssign); 5391 } 5392 } 5393 5394 // An implicitly-declared copy assignment operator is an inline public 5395 // member of its class. 5396 FunctionProtoType::ExtProtoInfo EPI; 5397 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 5398 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 5399 EST_None; 5400 EPI.NumExceptions = ExceptSpec.size(); 5401 EPI.Exceptions = ExceptSpec.data(); 5402 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5403 SourceLocation ClassLoc = ClassDecl->getLocation(); 5404 DeclarationNameInfo NameInfo(Name, ClassLoc); 5405 CXXMethodDecl *CopyAssignment 5406 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5407 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5408 /*TInfo=*/0, /*isStatic=*/false, 5409 /*StorageClassAsWritten=*/SC_None, 5410 /*isInline=*/true); 5411 CopyAssignment->setAccess(AS_public); 5412 CopyAssignment->setImplicit(); 5413 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5414 5415 // Add the parameter to the operator. 5416 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5417 ClassLoc, ClassLoc, /*Id=*/0, 5418 ArgType, /*TInfo=*/0, 5419 SC_None, 5420 SC_None, 0); 5421 CopyAssignment->setParams(&FromParam, 1); 5422 5423 // Note that we have added this copy-assignment operator. 5424 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5425 5426 if (Scope *S = getScopeForContext(ClassDecl)) 5427 PushOnScopeChains(CopyAssignment, S, false); 5428 ClassDecl->addDecl(CopyAssignment); 5429 5430 AddOverriddenMethods(ClassDecl, CopyAssignment); 5431 return CopyAssignment; 5432} 5433 5434void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5435 CXXMethodDecl *CopyAssignOperator) { 5436 assert((CopyAssignOperator->isImplicit() && 5437 CopyAssignOperator->isOverloadedOperator() && 5438 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5439 !CopyAssignOperator->isUsed(false)) && 5440 "DefineImplicitCopyAssignment called for wrong function"); 5441 5442 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5443 5444 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5445 CopyAssignOperator->setInvalidDecl(); 5446 return; 5447 } 5448 5449 CopyAssignOperator->setUsed(); 5450 5451 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5452 DiagnosticErrorTrap Trap(Diags); 5453 5454 // C++0x [class.copy]p30: 5455 // The implicitly-defined or explicitly-defaulted copy assignment operator 5456 // for a non-union class X performs memberwise copy assignment of its 5457 // subobjects. The direct base classes of X are assigned first, in the 5458 // order of their declaration in the base-specifier-list, and then the 5459 // immediate non-static data members of X are assigned, in the order in 5460 // which they were declared in the class definition. 5461 5462 // The statements that form the synthesized function body. 5463 ASTOwningVector<Stmt*> Statements(*this); 5464 5465 // The parameter for the "other" object, which we are copying from. 5466 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5467 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5468 QualType OtherRefType = Other->getType(); 5469 if (const LValueReferenceType *OtherRef 5470 = OtherRefType->getAs<LValueReferenceType>()) { 5471 OtherRefType = OtherRef->getPointeeType(); 5472 OtherQuals = OtherRefType.getQualifiers(); 5473 } 5474 5475 // Our location for everything implicitly-generated. 5476 SourceLocation Loc = CopyAssignOperator->getLocation(); 5477 5478 // Construct a reference to the "other" object. We'll be using this 5479 // throughout the generated ASTs. 5480 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5481 assert(OtherRef && "Reference to parameter cannot fail!"); 5482 5483 // Construct the "this" pointer. We'll be using this throughout the generated 5484 // ASTs. 5485 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5486 assert(This && "Reference to this cannot fail!"); 5487 5488 // Assign base classes. 5489 bool Invalid = false; 5490 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5491 E = ClassDecl->bases_end(); Base != E; ++Base) { 5492 // Form the assignment: 5493 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5494 QualType BaseType = Base->getType().getUnqualifiedType(); 5495 if (!BaseType->isRecordType()) { 5496 Invalid = true; 5497 continue; 5498 } 5499 5500 CXXCastPath BasePath; 5501 BasePath.push_back(Base); 5502 5503 // Construct the "from" expression, which is an implicit cast to the 5504 // appropriately-qualified base type. 5505 Expr *From = OtherRef; 5506 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5507 CK_UncheckedDerivedToBase, 5508 VK_LValue, &BasePath); 5509 5510 // Dereference "this". 5511 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5512 5513 // Implicitly cast "this" to the appropriately-qualified base type. 5514 Expr *ToE = To.takeAs<Expr>(); 5515 ImpCastExprToType(ToE, 5516 Context.getCVRQualifiedType(BaseType, 5517 CopyAssignOperator->getTypeQualifiers()), 5518 CK_UncheckedDerivedToBase, 5519 VK_LValue, &BasePath); 5520 To = Owned(ToE); 5521 5522 // Build the copy. 5523 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5524 To.get(), From, 5525 /*CopyingBaseSubobject=*/true); 5526 if (Copy.isInvalid()) { 5527 Diag(CurrentLocation, diag::note_member_synthesized_at) 5528 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5529 CopyAssignOperator->setInvalidDecl(); 5530 return; 5531 } 5532 5533 // Success! Record the copy. 5534 Statements.push_back(Copy.takeAs<Expr>()); 5535 } 5536 5537 // \brief Reference to the __builtin_memcpy function. 5538 Expr *BuiltinMemCpyRef = 0; 5539 // \brief Reference to the __builtin_objc_memmove_collectable function. 5540 Expr *CollectableMemCpyRef = 0; 5541 5542 // Assign non-static members. 5543 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5544 FieldEnd = ClassDecl->field_end(); 5545 Field != FieldEnd; ++Field) { 5546 // Check for members of reference type; we can't copy those. 5547 if (Field->getType()->isReferenceType()) { 5548 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5549 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5550 Diag(Field->getLocation(), diag::note_declared_at); 5551 Diag(CurrentLocation, diag::note_member_synthesized_at) 5552 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5553 Invalid = true; 5554 continue; 5555 } 5556 5557 // Check for members of const-qualified, non-class type. 5558 QualType BaseType = Context.getBaseElementType(Field->getType()); 5559 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5560 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5561 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5562 Diag(Field->getLocation(), diag::note_declared_at); 5563 Diag(CurrentLocation, diag::note_member_synthesized_at) 5564 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5565 Invalid = true; 5566 continue; 5567 } 5568 5569 QualType FieldType = Field->getType().getNonReferenceType(); 5570 if (FieldType->isIncompleteArrayType()) { 5571 assert(ClassDecl->hasFlexibleArrayMember() && 5572 "Incomplete array type is not valid"); 5573 continue; 5574 } 5575 5576 // Build references to the field in the object we're copying from and to. 5577 CXXScopeSpec SS; // Intentionally empty 5578 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5579 LookupMemberName); 5580 MemberLookup.addDecl(*Field); 5581 MemberLookup.resolveKind(); 5582 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5583 Loc, /*IsArrow=*/false, 5584 SS, 0, MemberLookup, 0); 5585 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5586 Loc, /*IsArrow=*/true, 5587 SS, 0, MemberLookup, 0); 5588 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5589 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5590 5591 // If the field should be copied with __builtin_memcpy rather than via 5592 // explicit assignments, do so. This optimization only applies for arrays 5593 // of scalars and arrays of class type with trivial copy-assignment 5594 // operators. 5595 if (FieldType->isArrayType() && 5596 (!BaseType->isRecordType() || 5597 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5598 ->hasTrivialCopyAssignment())) { 5599 // Compute the size of the memory buffer to be copied. 5600 QualType SizeType = Context.getSizeType(); 5601 llvm::APInt Size(Context.getTypeSize(SizeType), 5602 Context.getTypeSizeInChars(BaseType).getQuantity()); 5603 for (const ConstantArrayType *Array 5604 = Context.getAsConstantArrayType(FieldType); 5605 Array; 5606 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5607 llvm::APInt ArraySize 5608 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5609 Size *= ArraySize; 5610 } 5611 5612 // Take the address of the field references for "from" and "to". 5613 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5614 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5615 5616 bool NeedsCollectableMemCpy = 5617 (BaseType->isRecordType() && 5618 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5619 5620 if (NeedsCollectableMemCpy) { 5621 if (!CollectableMemCpyRef) { 5622 // Create a reference to the __builtin_objc_memmove_collectable function. 5623 LookupResult R(*this, 5624 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5625 Loc, LookupOrdinaryName); 5626 LookupName(R, TUScope, true); 5627 5628 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5629 if (!CollectableMemCpy) { 5630 // Something went horribly wrong earlier, and we will have 5631 // complained about it. 5632 Invalid = true; 5633 continue; 5634 } 5635 5636 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5637 CollectableMemCpy->getType(), 5638 VK_LValue, Loc, 0).take(); 5639 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5640 } 5641 } 5642 // Create a reference to the __builtin_memcpy builtin function. 5643 else if (!BuiltinMemCpyRef) { 5644 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5645 LookupOrdinaryName); 5646 LookupName(R, TUScope, true); 5647 5648 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5649 if (!BuiltinMemCpy) { 5650 // Something went horribly wrong earlier, and we will have complained 5651 // about it. 5652 Invalid = true; 5653 continue; 5654 } 5655 5656 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5657 BuiltinMemCpy->getType(), 5658 VK_LValue, Loc, 0).take(); 5659 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5660 } 5661 5662 ASTOwningVector<Expr*> CallArgs(*this); 5663 CallArgs.push_back(To.takeAs<Expr>()); 5664 CallArgs.push_back(From.takeAs<Expr>()); 5665 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5666 ExprResult Call = ExprError(); 5667 if (NeedsCollectableMemCpy) 5668 Call = ActOnCallExpr(/*Scope=*/0, 5669 CollectableMemCpyRef, 5670 Loc, move_arg(CallArgs), 5671 Loc); 5672 else 5673 Call = ActOnCallExpr(/*Scope=*/0, 5674 BuiltinMemCpyRef, 5675 Loc, move_arg(CallArgs), 5676 Loc); 5677 5678 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5679 Statements.push_back(Call.takeAs<Expr>()); 5680 continue; 5681 } 5682 5683 // Build the copy of this field. 5684 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5685 To.get(), From.get(), 5686 /*CopyingBaseSubobject=*/false); 5687 if (Copy.isInvalid()) { 5688 Diag(CurrentLocation, diag::note_member_synthesized_at) 5689 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5690 CopyAssignOperator->setInvalidDecl(); 5691 return; 5692 } 5693 5694 // Success! Record the copy. 5695 Statements.push_back(Copy.takeAs<Stmt>()); 5696 } 5697 5698 if (!Invalid) { 5699 // Add a "return *this;" 5700 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5701 5702 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5703 if (Return.isInvalid()) 5704 Invalid = true; 5705 else { 5706 Statements.push_back(Return.takeAs<Stmt>()); 5707 5708 if (Trap.hasErrorOccurred()) { 5709 Diag(CurrentLocation, diag::note_member_synthesized_at) 5710 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5711 Invalid = true; 5712 } 5713 } 5714 } 5715 5716 if (Invalid) { 5717 CopyAssignOperator->setInvalidDecl(); 5718 return; 5719 } 5720 5721 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5722 /*isStmtExpr=*/false); 5723 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5724 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5725} 5726 5727CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5728 CXXRecordDecl *ClassDecl) { 5729 // C++ [class.copy]p4: 5730 // If the class definition does not explicitly declare a copy 5731 // constructor, one is declared implicitly. 5732 5733 // C++ [class.copy]p5: 5734 // The implicitly-declared copy constructor for a class X will 5735 // have the form 5736 // 5737 // X::X(const X&) 5738 // 5739 // if 5740 bool HasConstCopyConstructor = true; 5741 5742 // -- each direct or virtual base class B of X has a copy 5743 // constructor whose first parameter is of type const B& or 5744 // const volatile B&, and 5745 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5746 BaseEnd = ClassDecl->bases_end(); 5747 HasConstCopyConstructor && Base != BaseEnd; 5748 ++Base) { 5749 // Virtual bases are handled below. 5750 if (Base->isVirtual()) 5751 continue; 5752 5753 CXXRecordDecl *BaseClassDecl 5754 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5755 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5756 DeclareImplicitCopyConstructor(BaseClassDecl); 5757 5758 HasConstCopyConstructor 5759 = BaseClassDecl->hasConstCopyConstructor(Context); 5760 } 5761 5762 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5763 BaseEnd = ClassDecl->vbases_end(); 5764 HasConstCopyConstructor && Base != BaseEnd; 5765 ++Base) { 5766 CXXRecordDecl *BaseClassDecl 5767 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5768 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5769 DeclareImplicitCopyConstructor(BaseClassDecl); 5770 5771 HasConstCopyConstructor 5772 = BaseClassDecl->hasConstCopyConstructor(Context); 5773 } 5774 5775 // -- for all the nonstatic data members of X that are of a 5776 // class type M (or array thereof), each such class type 5777 // has a copy constructor whose first parameter is of type 5778 // const M& or const volatile M&. 5779 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5780 FieldEnd = ClassDecl->field_end(); 5781 HasConstCopyConstructor && Field != FieldEnd; 5782 ++Field) { 5783 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5784 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5785 CXXRecordDecl *FieldClassDecl 5786 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5787 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5788 DeclareImplicitCopyConstructor(FieldClassDecl); 5789 5790 HasConstCopyConstructor 5791 = FieldClassDecl->hasConstCopyConstructor(Context); 5792 } 5793 } 5794 5795 // Otherwise, the implicitly declared copy constructor will have 5796 // the form 5797 // 5798 // X::X(X&) 5799 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5800 QualType ArgType = ClassType; 5801 if (HasConstCopyConstructor) 5802 ArgType = ArgType.withConst(); 5803 ArgType = Context.getLValueReferenceType(ArgType); 5804 5805 // C++ [except.spec]p14: 5806 // An implicitly declared special member function (Clause 12) shall have an 5807 // exception-specification. [...] 5808 ImplicitExceptionSpecification ExceptSpec(Context); 5809 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5810 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5811 BaseEnd = ClassDecl->bases_end(); 5812 Base != BaseEnd; 5813 ++Base) { 5814 // Virtual bases are handled below. 5815 if (Base->isVirtual()) 5816 continue; 5817 5818 CXXRecordDecl *BaseClassDecl 5819 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5820 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5821 DeclareImplicitCopyConstructor(BaseClassDecl); 5822 5823 if (CXXConstructorDecl *CopyConstructor 5824 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5825 ExceptSpec.CalledDecl(CopyConstructor); 5826 } 5827 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5828 BaseEnd = ClassDecl->vbases_end(); 5829 Base != BaseEnd; 5830 ++Base) { 5831 CXXRecordDecl *BaseClassDecl 5832 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5833 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5834 DeclareImplicitCopyConstructor(BaseClassDecl); 5835 5836 if (CXXConstructorDecl *CopyConstructor 5837 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5838 ExceptSpec.CalledDecl(CopyConstructor); 5839 } 5840 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5841 FieldEnd = ClassDecl->field_end(); 5842 Field != FieldEnd; 5843 ++Field) { 5844 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5845 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5846 CXXRecordDecl *FieldClassDecl 5847 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5848 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5849 DeclareImplicitCopyConstructor(FieldClassDecl); 5850 5851 if (CXXConstructorDecl *CopyConstructor 5852 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5853 ExceptSpec.CalledDecl(CopyConstructor); 5854 } 5855 } 5856 5857 // An implicitly-declared copy constructor is an inline public 5858 // member of its class. 5859 FunctionProtoType::ExtProtoInfo EPI; 5860 EPI.ExceptionSpecType = ExceptSpec.hasExceptionSpecification() ? 5861 (ExceptSpec.hasAnyExceptionSpecification() ? EST_DynamicAny : EST_Dynamic) : 5862 EST_None; 5863 EPI.NumExceptions = ExceptSpec.size(); 5864 EPI.Exceptions = ExceptSpec.data(); 5865 DeclarationName Name 5866 = Context.DeclarationNames.getCXXConstructorName( 5867 Context.getCanonicalType(ClassType)); 5868 SourceLocation ClassLoc = ClassDecl->getLocation(); 5869 DeclarationNameInfo NameInfo(Name, ClassLoc); 5870 CXXConstructorDecl *CopyConstructor 5871 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5872 Context.getFunctionType(Context.VoidTy, 5873 &ArgType, 1, EPI), 5874 /*TInfo=*/0, 5875 /*isExplicit=*/false, 5876 /*isInline=*/true, 5877 /*isImplicitlyDeclared=*/true); 5878 CopyConstructor->setAccess(AS_public); 5879 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5880 5881 // Note that we have declared this constructor. 5882 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5883 5884 // Add the parameter to the constructor. 5885 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5886 ClassLoc, ClassLoc, 5887 /*IdentifierInfo=*/0, 5888 ArgType, /*TInfo=*/0, 5889 SC_None, 5890 SC_None, 0); 5891 CopyConstructor->setParams(&FromParam, 1); 5892 if (Scope *S = getScopeForContext(ClassDecl)) 5893 PushOnScopeChains(CopyConstructor, S, false); 5894 ClassDecl->addDecl(CopyConstructor); 5895 5896 return CopyConstructor; 5897} 5898 5899void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5900 CXXConstructorDecl *CopyConstructor, 5901 unsigned TypeQuals) { 5902 assert((CopyConstructor->isImplicit() && 5903 CopyConstructor->isCopyConstructor(TypeQuals) && 5904 !CopyConstructor->isUsed(false)) && 5905 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5906 5907 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5908 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5909 5910 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5911 DiagnosticErrorTrap Trap(Diags); 5912 5913 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5914 Trap.hasErrorOccurred()) { 5915 Diag(CurrentLocation, diag::note_member_synthesized_at) 5916 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5917 CopyConstructor->setInvalidDecl(); 5918 } else { 5919 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5920 CopyConstructor->getLocation(), 5921 MultiStmtArg(*this, 0, 0), 5922 /*isStmtExpr=*/false) 5923 .takeAs<Stmt>()); 5924 } 5925 5926 CopyConstructor->setUsed(); 5927} 5928 5929ExprResult 5930Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5931 CXXConstructorDecl *Constructor, 5932 MultiExprArg ExprArgs, 5933 bool RequiresZeroInit, 5934 unsigned ConstructKind, 5935 SourceRange ParenRange) { 5936 bool Elidable = false; 5937 5938 // C++0x [class.copy]p34: 5939 // When certain criteria are met, an implementation is allowed to 5940 // omit the copy/move construction of a class object, even if the 5941 // copy/move constructor and/or destructor for the object have 5942 // side effects. [...] 5943 // - when a temporary class object that has not been bound to a 5944 // reference (12.2) would be copied/moved to a class object 5945 // with the same cv-unqualified type, the copy/move operation 5946 // can be omitted by constructing the temporary object 5947 // directly into the target of the omitted copy/move 5948 if (ConstructKind == CXXConstructExpr::CK_Complete && 5949 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 5950 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5951 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 5952 } 5953 5954 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5955 Elidable, move(ExprArgs), RequiresZeroInit, 5956 ConstructKind, ParenRange); 5957} 5958 5959/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5960/// including handling of its default argument expressions. 5961ExprResult 5962Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5963 CXXConstructorDecl *Constructor, bool Elidable, 5964 MultiExprArg ExprArgs, 5965 bool RequiresZeroInit, 5966 unsigned ConstructKind, 5967 SourceRange ParenRange) { 5968 unsigned NumExprs = ExprArgs.size(); 5969 Expr **Exprs = (Expr **)ExprArgs.release(); 5970 5971 MarkDeclarationReferenced(ConstructLoc, Constructor); 5972 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5973 Constructor, Elidable, Exprs, NumExprs, 5974 RequiresZeroInit, 5975 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 5976 ParenRange)); 5977} 5978 5979bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5980 CXXConstructorDecl *Constructor, 5981 MultiExprArg Exprs) { 5982 // FIXME: Provide the correct paren SourceRange when available. 5983 ExprResult TempResult = 5984 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5985 move(Exprs), false, CXXConstructExpr::CK_Complete, 5986 SourceRange()); 5987 if (TempResult.isInvalid()) 5988 return true; 5989 5990 Expr *Temp = TempResult.takeAs<Expr>(); 5991 CheckImplicitConversions(Temp, VD->getLocation()); 5992 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5993 Temp = MaybeCreateExprWithCleanups(Temp); 5994 VD->setInit(Temp); 5995 5996 return false; 5997} 5998 5999void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6000 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6001 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 6002 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 6003 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6004 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6005 CheckDestructorAccess(VD->getLocation(), Destructor, 6006 PDiag(diag::err_access_dtor_var) 6007 << VD->getDeclName() 6008 << VD->getType()); 6009 6010 // TODO: this should be re-enabled for static locals by !CXAAtExit 6011 if (!VD->isInvalidDecl() && VD->hasGlobalStorage() && !VD->isStaticLocal()) 6012 Diag(VD->getLocation(), diag::warn_global_destructor); 6013 } 6014} 6015 6016/// AddCXXDirectInitializerToDecl - This action is called immediately after 6017/// ActOnDeclarator, when a C++ direct initializer is present. 6018/// e.g: "int x(1);" 6019void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6020 SourceLocation LParenLoc, 6021 MultiExprArg Exprs, 6022 SourceLocation RParenLoc, 6023 bool TypeMayContainAuto) { 6024 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6025 6026 // If there is no declaration, there was an error parsing it. Just ignore 6027 // the initializer. 6028 if (RealDecl == 0) 6029 return; 6030 6031 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6032 if (!VDecl) { 6033 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6034 RealDecl->setInvalidDecl(); 6035 return; 6036 } 6037 6038 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6039 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6040 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6041 if (Exprs.size() > 1) { 6042 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6043 diag::err_auto_var_init_multiple_expressions) 6044 << VDecl->getDeclName() << VDecl->getType() 6045 << VDecl->getSourceRange(); 6046 RealDecl->setInvalidDecl(); 6047 return; 6048 } 6049 6050 Expr *Init = Exprs.get()[0]; 6051 QualType DeducedType; 6052 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 6053 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6054 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6055 << Init->getSourceRange(); 6056 RealDecl->setInvalidDecl(); 6057 return; 6058 } 6059 VDecl->setType(DeducedType); 6060 6061 // If this is a redeclaration, check that the type we just deduced matches 6062 // the previously declared type. 6063 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6064 MergeVarDeclTypes(VDecl, Old); 6065 } 6066 6067 // We will represent direct-initialization similarly to copy-initialization: 6068 // int x(1); -as-> int x = 1; 6069 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6070 // 6071 // Clients that want to distinguish between the two forms, can check for 6072 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6073 // A major benefit is that clients that don't particularly care about which 6074 // exactly form was it (like the CodeGen) can handle both cases without 6075 // special case code. 6076 6077 // C++ 8.5p11: 6078 // The form of initialization (using parentheses or '=') is generally 6079 // insignificant, but does matter when the entity being initialized has a 6080 // class type. 6081 6082 if (!VDecl->getType()->isDependentType() && 6083 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6084 diag::err_typecheck_decl_incomplete_type)) { 6085 VDecl->setInvalidDecl(); 6086 return; 6087 } 6088 6089 // The variable can not have an abstract class type. 6090 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6091 diag::err_abstract_type_in_decl, 6092 AbstractVariableType)) 6093 VDecl->setInvalidDecl(); 6094 6095 const VarDecl *Def; 6096 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6097 Diag(VDecl->getLocation(), diag::err_redefinition) 6098 << VDecl->getDeclName(); 6099 Diag(Def->getLocation(), diag::note_previous_definition); 6100 VDecl->setInvalidDecl(); 6101 return; 6102 } 6103 6104 // C++ [class.static.data]p4 6105 // If a static data member is of const integral or const 6106 // enumeration type, its declaration in the class definition can 6107 // specify a constant-initializer which shall be an integral 6108 // constant expression (5.19). In that case, the member can appear 6109 // in integral constant expressions. The member shall still be 6110 // defined in a namespace scope if it is used in the program and the 6111 // namespace scope definition shall not contain an initializer. 6112 // 6113 // We already performed a redefinition check above, but for static 6114 // data members we also need to check whether there was an in-class 6115 // declaration with an initializer. 6116 const VarDecl* PrevInit = 0; 6117 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6118 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6119 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6120 return; 6121 } 6122 6123 bool IsDependent = false; 6124 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6125 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6126 VDecl->setInvalidDecl(); 6127 return; 6128 } 6129 6130 if (Exprs.get()[I]->isTypeDependent()) 6131 IsDependent = true; 6132 } 6133 6134 // If either the declaration has a dependent type or if any of the 6135 // expressions is type-dependent, we represent the initialization 6136 // via a ParenListExpr for later use during template instantiation. 6137 if (VDecl->getType()->isDependentType() || IsDependent) { 6138 // Let clients know that initialization was done with a direct initializer. 6139 VDecl->setCXXDirectInitializer(true); 6140 6141 // Store the initialization expressions as a ParenListExpr. 6142 unsigned NumExprs = Exprs.size(); 6143 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6144 (Expr **)Exprs.release(), 6145 NumExprs, RParenLoc)); 6146 return; 6147 } 6148 6149 // Capture the variable that is being initialized and the style of 6150 // initialization. 6151 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6152 6153 // FIXME: Poor source location information. 6154 InitializationKind Kind 6155 = InitializationKind::CreateDirect(VDecl->getLocation(), 6156 LParenLoc, RParenLoc); 6157 6158 InitializationSequence InitSeq(*this, Entity, Kind, 6159 Exprs.get(), Exprs.size()); 6160 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6161 if (Result.isInvalid()) { 6162 VDecl->setInvalidDecl(); 6163 return; 6164 } 6165 6166 CheckImplicitConversions(Result.get(), LParenLoc); 6167 6168 Result = MaybeCreateExprWithCleanups(Result); 6169 VDecl->setInit(Result.takeAs<Expr>()); 6170 VDecl->setCXXDirectInitializer(true); 6171 6172 CheckCompleteVariableDeclaration(VDecl); 6173} 6174 6175/// \brief Given a constructor and the set of arguments provided for the 6176/// constructor, convert the arguments and add any required default arguments 6177/// to form a proper call to this constructor. 6178/// 6179/// \returns true if an error occurred, false otherwise. 6180bool 6181Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6182 MultiExprArg ArgsPtr, 6183 SourceLocation Loc, 6184 ASTOwningVector<Expr*> &ConvertedArgs) { 6185 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6186 unsigned NumArgs = ArgsPtr.size(); 6187 Expr **Args = (Expr **)ArgsPtr.get(); 6188 6189 const FunctionProtoType *Proto 6190 = Constructor->getType()->getAs<FunctionProtoType>(); 6191 assert(Proto && "Constructor without a prototype?"); 6192 unsigned NumArgsInProto = Proto->getNumArgs(); 6193 6194 // If too few arguments are available, we'll fill in the rest with defaults. 6195 if (NumArgs < NumArgsInProto) 6196 ConvertedArgs.reserve(NumArgsInProto); 6197 else 6198 ConvertedArgs.reserve(NumArgs); 6199 6200 VariadicCallType CallType = 6201 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6202 llvm::SmallVector<Expr *, 8> AllArgs; 6203 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6204 Proto, 0, Args, NumArgs, AllArgs, 6205 CallType); 6206 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6207 ConvertedArgs.push_back(AllArgs[i]); 6208 return Invalid; 6209} 6210 6211static inline bool 6212CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6213 const FunctionDecl *FnDecl) { 6214 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6215 if (isa<NamespaceDecl>(DC)) { 6216 return SemaRef.Diag(FnDecl->getLocation(), 6217 diag::err_operator_new_delete_declared_in_namespace) 6218 << FnDecl->getDeclName(); 6219 } 6220 6221 if (isa<TranslationUnitDecl>(DC) && 6222 FnDecl->getStorageClass() == SC_Static) { 6223 return SemaRef.Diag(FnDecl->getLocation(), 6224 diag::err_operator_new_delete_declared_static) 6225 << FnDecl->getDeclName(); 6226 } 6227 6228 return false; 6229} 6230 6231static inline bool 6232CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6233 CanQualType ExpectedResultType, 6234 CanQualType ExpectedFirstParamType, 6235 unsigned DependentParamTypeDiag, 6236 unsigned InvalidParamTypeDiag) { 6237 QualType ResultType = 6238 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6239 6240 // Check that the result type is not dependent. 6241 if (ResultType->isDependentType()) 6242 return SemaRef.Diag(FnDecl->getLocation(), 6243 diag::err_operator_new_delete_dependent_result_type) 6244 << FnDecl->getDeclName() << ExpectedResultType; 6245 6246 // Check that the result type is what we expect. 6247 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6248 return SemaRef.Diag(FnDecl->getLocation(), 6249 diag::err_operator_new_delete_invalid_result_type) 6250 << FnDecl->getDeclName() << ExpectedResultType; 6251 6252 // A function template must have at least 2 parameters. 6253 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6254 return SemaRef.Diag(FnDecl->getLocation(), 6255 diag::err_operator_new_delete_template_too_few_parameters) 6256 << FnDecl->getDeclName(); 6257 6258 // The function decl must have at least 1 parameter. 6259 if (FnDecl->getNumParams() == 0) 6260 return SemaRef.Diag(FnDecl->getLocation(), 6261 diag::err_operator_new_delete_too_few_parameters) 6262 << FnDecl->getDeclName(); 6263 6264 // Check the the first parameter type is not dependent. 6265 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6266 if (FirstParamType->isDependentType()) 6267 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6268 << FnDecl->getDeclName() << ExpectedFirstParamType; 6269 6270 // Check that the first parameter type is what we expect. 6271 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6272 ExpectedFirstParamType) 6273 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6274 << FnDecl->getDeclName() << ExpectedFirstParamType; 6275 6276 return false; 6277} 6278 6279static bool 6280CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6281 // C++ [basic.stc.dynamic.allocation]p1: 6282 // A program is ill-formed if an allocation function is declared in a 6283 // namespace scope other than global scope or declared static in global 6284 // scope. 6285 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6286 return true; 6287 6288 CanQualType SizeTy = 6289 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6290 6291 // C++ [basic.stc.dynamic.allocation]p1: 6292 // The return type shall be void*. The first parameter shall have type 6293 // std::size_t. 6294 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6295 SizeTy, 6296 diag::err_operator_new_dependent_param_type, 6297 diag::err_operator_new_param_type)) 6298 return true; 6299 6300 // C++ [basic.stc.dynamic.allocation]p1: 6301 // The first parameter shall not have an associated default argument. 6302 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6303 return SemaRef.Diag(FnDecl->getLocation(), 6304 diag::err_operator_new_default_arg) 6305 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6306 6307 return false; 6308} 6309 6310static bool 6311CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6312 // C++ [basic.stc.dynamic.deallocation]p1: 6313 // A program is ill-formed if deallocation functions are declared in a 6314 // namespace scope other than global scope or declared static in global 6315 // scope. 6316 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6317 return true; 6318 6319 // C++ [basic.stc.dynamic.deallocation]p2: 6320 // Each deallocation function shall return void and its first parameter 6321 // shall be void*. 6322 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6323 SemaRef.Context.VoidPtrTy, 6324 diag::err_operator_delete_dependent_param_type, 6325 diag::err_operator_delete_param_type)) 6326 return true; 6327 6328 return false; 6329} 6330 6331/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6332/// of this overloaded operator is well-formed. If so, returns false; 6333/// otherwise, emits appropriate diagnostics and returns true. 6334bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6335 assert(FnDecl && FnDecl->isOverloadedOperator() && 6336 "Expected an overloaded operator declaration"); 6337 6338 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6339 6340 // C++ [over.oper]p5: 6341 // The allocation and deallocation functions, operator new, 6342 // operator new[], operator delete and operator delete[], are 6343 // described completely in 3.7.3. The attributes and restrictions 6344 // found in the rest of this subclause do not apply to them unless 6345 // explicitly stated in 3.7.3. 6346 if (Op == OO_Delete || Op == OO_Array_Delete) 6347 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6348 6349 if (Op == OO_New || Op == OO_Array_New) 6350 return CheckOperatorNewDeclaration(*this, FnDecl); 6351 6352 // C++ [over.oper]p6: 6353 // An operator function shall either be a non-static member 6354 // function or be a non-member function and have at least one 6355 // parameter whose type is a class, a reference to a class, an 6356 // enumeration, or a reference to an enumeration. 6357 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6358 if (MethodDecl->isStatic()) 6359 return Diag(FnDecl->getLocation(), 6360 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6361 } else { 6362 bool ClassOrEnumParam = false; 6363 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6364 ParamEnd = FnDecl->param_end(); 6365 Param != ParamEnd; ++Param) { 6366 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6367 if (ParamType->isDependentType() || ParamType->isRecordType() || 6368 ParamType->isEnumeralType()) { 6369 ClassOrEnumParam = true; 6370 break; 6371 } 6372 } 6373 6374 if (!ClassOrEnumParam) 6375 return Diag(FnDecl->getLocation(), 6376 diag::err_operator_overload_needs_class_or_enum) 6377 << FnDecl->getDeclName(); 6378 } 6379 6380 // C++ [over.oper]p8: 6381 // An operator function cannot have default arguments (8.3.6), 6382 // except where explicitly stated below. 6383 // 6384 // Only the function-call operator allows default arguments 6385 // (C++ [over.call]p1). 6386 if (Op != OO_Call) { 6387 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6388 Param != FnDecl->param_end(); ++Param) { 6389 if ((*Param)->hasDefaultArg()) 6390 return Diag((*Param)->getLocation(), 6391 diag::err_operator_overload_default_arg) 6392 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6393 } 6394 } 6395 6396 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6397 { false, false, false } 6398#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6399 , { Unary, Binary, MemberOnly } 6400#include "clang/Basic/OperatorKinds.def" 6401 }; 6402 6403 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6404 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6405 bool MustBeMemberOperator = OperatorUses[Op][2]; 6406 6407 // C++ [over.oper]p8: 6408 // [...] Operator functions cannot have more or fewer parameters 6409 // than the number required for the corresponding operator, as 6410 // described in the rest of this subclause. 6411 unsigned NumParams = FnDecl->getNumParams() 6412 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6413 if (Op != OO_Call && 6414 ((NumParams == 1 && !CanBeUnaryOperator) || 6415 (NumParams == 2 && !CanBeBinaryOperator) || 6416 (NumParams < 1) || (NumParams > 2))) { 6417 // We have the wrong number of parameters. 6418 unsigned ErrorKind; 6419 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6420 ErrorKind = 2; // 2 -> unary or binary. 6421 } else if (CanBeUnaryOperator) { 6422 ErrorKind = 0; // 0 -> unary 6423 } else { 6424 assert(CanBeBinaryOperator && 6425 "All non-call overloaded operators are unary or binary!"); 6426 ErrorKind = 1; // 1 -> binary 6427 } 6428 6429 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6430 << FnDecl->getDeclName() << NumParams << ErrorKind; 6431 } 6432 6433 // Overloaded operators other than operator() cannot be variadic. 6434 if (Op != OO_Call && 6435 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6436 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6437 << FnDecl->getDeclName(); 6438 } 6439 6440 // Some operators must be non-static member functions. 6441 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6442 return Diag(FnDecl->getLocation(), 6443 diag::err_operator_overload_must_be_member) 6444 << FnDecl->getDeclName(); 6445 } 6446 6447 // C++ [over.inc]p1: 6448 // The user-defined function called operator++ implements the 6449 // prefix and postfix ++ operator. If this function is a member 6450 // function with no parameters, or a non-member function with one 6451 // parameter of class or enumeration type, it defines the prefix 6452 // increment operator ++ for objects of that type. If the function 6453 // is a member function with one parameter (which shall be of type 6454 // int) or a non-member function with two parameters (the second 6455 // of which shall be of type int), it defines the postfix 6456 // increment operator ++ for objects of that type. 6457 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6458 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6459 bool ParamIsInt = false; 6460 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6461 ParamIsInt = BT->getKind() == BuiltinType::Int; 6462 6463 if (!ParamIsInt) 6464 return Diag(LastParam->getLocation(), 6465 diag::err_operator_overload_post_incdec_must_be_int) 6466 << LastParam->getType() << (Op == OO_MinusMinus); 6467 } 6468 6469 return false; 6470} 6471 6472/// CheckLiteralOperatorDeclaration - Check whether the declaration 6473/// of this literal operator function is well-formed. If so, returns 6474/// false; otherwise, emits appropriate diagnostics and returns true. 6475bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6476 DeclContext *DC = FnDecl->getDeclContext(); 6477 Decl::Kind Kind = DC->getDeclKind(); 6478 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6479 Kind != Decl::LinkageSpec) { 6480 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6481 << FnDecl->getDeclName(); 6482 return true; 6483 } 6484 6485 bool Valid = false; 6486 6487 // template <char...> type operator "" name() is the only valid template 6488 // signature, and the only valid signature with no parameters. 6489 if (FnDecl->param_size() == 0) { 6490 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6491 // Must have only one template parameter 6492 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6493 if (Params->size() == 1) { 6494 NonTypeTemplateParmDecl *PmDecl = 6495 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6496 6497 // The template parameter must be a char parameter pack. 6498 if (PmDecl && PmDecl->isTemplateParameterPack() && 6499 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6500 Valid = true; 6501 } 6502 } 6503 } else { 6504 // Check the first parameter 6505 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6506 6507 QualType T = (*Param)->getType(); 6508 6509 // unsigned long long int, long double, and any character type are allowed 6510 // as the only parameters. 6511 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6512 Context.hasSameType(T, Context.LongDoubleTy) || 6513 Context.hasSameType(T, Context.CharTy) || 6514 Context.hasSameType(T, Context.WCharTy) || 6515 Context.hasSameType(T, Context.Char16Ty) || 6516 Context.hasSameType(T, Context.Char32Ty)) { 6517 if (++Param == FnDecl->param_end()) 6518 Valid = true; 6519 goto FinishedParams; 6520 } 6521 6522 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6523 const PointerType *PT = T->getAs<PointerType>(); 6524 if (!PT) 6525 goto FinishedParams; 6526 T = PT->getPointeeType(); 6527 if (!T.isConstQualified()) 6528 goto FinishedParams; 6529 T = T.getUnqualifiedType(); 6530 6531 // Move on to the second parameter; 6532 ++Param; 6533 6534 // If there is no second parameter, the first must be a const char * 6535 if (Param == FnDecl->param_end()) { 6536 if (Context.hasSameType(T, Context.CharTy)) 6537 Valid = true; 6538 goto FinishedParams; 6539 } 6540 6541 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6542 // are allowed as the first parameter to a two-parameter function 6543 if (!(Context.hasSameType(T, Context.CharTy) || 6544 Context.hasSameType(T, Context.WCharTy) || 6545 Context.hasSameType(T, Context.Char16Ty) || 6546 Context.hasSameType(T, Context.Char32Ty))) 6547 goto FinishedParams; 6548 6549 // The second and final parameter must be an std::size_t 6550 T = (*Param)->getType().getUnqualifiedType(); 6551 if (Context.hasSameType(T, Context.getSizeType()) && 6552 ++Param == FnDecl->param_end()) 6553 Valid = true; 6554 } 6555 6556 // FIXME: This diagnostic is absolutely terrible. 6557FinishedParams: 6558 if (!Valid) { 6559 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6560 << FnDecl->getDeclName(); 6561 return true; 6562 } 6563 6564 return false; 6565} 6566 6567/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6568/// linkage specification, including the language and (if present) 6569/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6570/// the location of the language string literal, which is provided 6571/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6572/// the '{' brace. Otherwise, this linkage specification does not 6573/// have any braces. 6574Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6575 SourceLocation LangLoc, 6576 llvm::StringRef Lang, 6577 SourceLocation LBraceLoc) { 6578 LinkageSpecDecl::LanguageIDs Language; 6579 if (Lang == "\"C\"") 6580 Language = LinkageSpecDecl::lang_c; 6581 else if (Lang == "\"C++\"") 6582 Language = LinkageSpecDecl::lang_cxx; 6583 else { 6584 Diag(LangLoc, diag::err_bad_language); 6585 return 0; 6586 } 6587 6588 // FIXME: Add all the various semantics of linkage specifications 6589 6590 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6591 LangLoc, Language); 6592 CurContext->addDecl(D); 6593 PushDeclContext(S, D); 6594 return D; 6595} 6596 6597/// ActOnFinishLinkageSpecification - Complete the definition of 6598/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6599/// valid, it's the position of the closing '}' brace in a linkage 6600/// specification that uses braces. 6601Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6602 Decl *LinkageSpec, 6603 SourceLocation RBraceLoc) { 6604 if (LinkageSpec) { 6605 if (RBraceLoc.isValid()) { 6606 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6607 LSDecl->setRBraceLoc(RBraceLoc); 6608 } 6609 PopDeclContext(); 6610 } 6611 return LinkageSpec; 6612} 6613 6614/// \brief Perform semantic analysis for the variable declaration that 6615/// occurs within a C++ catch clause, returning the newly-created 6616/// variable. 6617VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6618 TypeSourceInfo *TInfo, 6619 SourceLocation StartLoc, 6620 SourceLocation Loc, 6621 IdentifierInfo *Name) { 6622 bool Invalid = false; 6623 QualType ExDeclType = TInfo->getType(); 6624 6625 // Arrays and functions decay. 6626 if (ExDeclType->isArrayType()) 6627 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6628 else if (ExDeclType->isFunctionType()) 6629 ExDeclType = Context.getPointerType(ExDeclType); 6630 6631 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6632 // The exception-declaration shall not denote a pointer or reference to an 6633 // incomplete type, other than [cv] void*. 6634 // N2844 forbids rvalue references. 6635 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6636 Diag(Loc, diag::err_catch_rvalue_ref); 6637 Invalid = true; 6638 } 6639 6640 // GCC allows catching pointers and references to incomplete types 6641 // as an extension; so do we, but we warn by default. 6642 6643 QualType BaseType = ExDeclType; 6644 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6645 unsigned DK = diag::err_catch_incomplete; 6646 bool IncompleteCatchIsInvalid = true; 6647 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6648 BaseType = Ptr->getPointeeType(); 6649 Mode = 1; 6650 DK = diag::ext_catch_incomplete_ptr; 6651 IncompleteCatchIsInvalid = false; 6652 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6653 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6654 BaseType = Ref->getPointeeType(); 6655 Mode = 2; 6656 DK = diag::ext_catch_incomplete_ref; 6657 IncompleteCatchIsInvalid = false; 6658 } 6659 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6660 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6661 IncompleteCatchIsInvalid) 6662 Invalid = true; 6663 6664 if (!Invalid && !ExDeclType->isDependentType() && 6665 RequireNonAbstractType(Loc, ExDeclType, 6666 diag::err_abstract_type_in_decl, 6667 AbstractVariableType)) 6668 Invalid = true; 6669 6670 // Only the non-fragile NeXT runtime currently supports C++ catches 6671 // of ObjC types, and no runtime supports catching ObjC types by value. 6672 if (!Invalid && getLangOptions().ObjC1) { 6673 QualType T = ExDeclType; 6674 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6675 T = RT->getPointeeType(); 6676 6677 if (T->isObjCObjectType()) { 6678 Diag(Loc, diag::err_objc_object_catch); 6679 Invalid = true; 6680 } else if (T->isObjCObjectPointerType()) { 6681 if (!getLangOptions().NeXTRuntime) { 6682 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6683 Invalid = true; 6684 } else if (!getLangOptions().ObjCNonFragileABI) { 6685 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6686 Invalid = true; 6687 } 6688 } 6689 } 6690 6691 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6692 ExDeclType, TInfo, SC_None, SC_None); 6693 ExDecl->setExceptionVariable(true); 6694 6695 if (!Invalid) { 6696 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6697 // C++ [except.handle]p16: 6698 // The object declared in an exception-declaration or, if the 6699 // exception-declaration does not specify a name, a temporary (12.2) is 6700 // copy-initialized (8.5) from the exception object. [...] 6701 // The object is destroyed when the handler exits, after the destruction 6702 // of any automatic objects initialized within the handler. 6703 // 6704 // We just pretend to initialize the object with itself, then make sure 6705 // it can be destroyed later. 6706 QualType initType = ExDeclType; 6707 6708 InitializedEntity entity = 6709 InitializedEntity::InitializeVariable(ExDecl); 6710 InitializationKind initKind = 6711 InitializationKind::CreateCopy(Loc, SourceLocation()); 6712 6713 Expr *opaqueValue = 6714 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6715 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6716 ExprResult result = sequence.Perform(*this, entity, initKind, 6717 MultiExprArg(&opaqueValue, 1)); 6718 if (result.isInvalid()) 6719 Invalid = true; 6720 else { 6721 // If the constructor used was non-trivial, set this as the 6722 // "initializer". 6723 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6724 if (!construct->getConstructor()->isTrivial()) { 6725 Expr *init = MaybeCreateExprWithCleanups(construct); 6726 ExDecl->setInit(init); 6727 } 6728 6729 // And make sure it's destructable. 6730 FinalizeVarWithDestructor(ExDecl, recordType); 6731 } 6732 } 6733 } 6734 6735 if (Invalid) 6736 ExDecl->setInvalidDecl(); 6737 6738 return ExDecl; 6739} 6740 6741/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6742/// handler. 6743Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6744 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6745 bool Invalid = D.isInvalidType(); 6746 6747 // Check for unexpanded parameter packs. 6748 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6749 UPPC_ExceptionType)) { 6750 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6751 D.getIdentifierLoc()); 6752 Invalid = true; 6753 } 6754 6755 IdentifierInfo *II = D.getIdentifier(); 6756 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6757 LookupOrdinaryName, 6758 ForRedeclaration)) { 6759 // The scope should be freshly made just for us. There is just no way 6760 // it contains any previous declaration. 6761 assert(!S->isDeclScope(PrevDecl)); 6762 if (PrevDecl->isTemplateParameter()) { 6763 // Maybe we will complain about the shadowed template parameter. 6764 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6765 } 6766 } 6767 6768 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6769 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6770 << D.getCXXScopeSpec().getRange(); 6771 Invalid = true; 6772 } 6773 6774 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6775 D.getSourceRange().getBegin(), 6776 D.getIdentifierLoc(), 6777 D.getIdentifier()); 6778 if (Invalid) 6779 ExDecl->setInvalidDecl(); 6780 6781 // Add the exception declaration into this scope. 6782 if (II) 6783 PushOnScopeChains(ExDecl, S); 6784 else 6785 CurContext->addDecl(ExDecl); 6786 6787 ProcessDeclAttributes(S, ExDecl, D); 6788 return ExDecl; 6789} 6790 6791Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6792 Expr *AssertExpr, 6793 Expr *AssertMessageExpr_) { 6794 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6795 6796 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6797 llvm::APSInt Value(32); 6798 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6799 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6800 AssertExpr->getSourceRange(); 6801 return 0; 6802 } 6803 6804 if (Value == 0) { 6805 Diag(AssertLoc, diag::err_static_assert_failed) 6806 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6807 } 6808 } 6809 6810 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 6811 return 0; 6812 6813 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6814 AssertExpr, AssertMessage); 6815 6816 CurContext->addDecl(Decl); 6817 return Decl; 6818} 6819 6820/// \brief Perform semantic analysis of the given friend type declaration. 6821/// 6822/// \returns A friend declaration that. 6823FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6824 TypeSourceInfo *TSInfo) { 6825 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6826 6827 QualType T = TSInfo->getType(); 6828 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6829 6830 if (!getLangOptions().CPlusPlus0x) { 6831 // C++03 [class.friend]p2: 6832 // An elaborated-type-specifier shall be used in a friend declaration 6833 // for a class.* 6834 // 6835 // * The class-key of the elaborated-type-specifier is required. 6836 if (!ActiveTemplateInstantiations.empty()) { 6837 // Do not complain about the form of friend template types during 6838 // template instantiation; we will already have complained when the 6839 // template was declared. 6840 } else if (!T->isElaboratedTypeSpecifier()) { 6841 // If we evaluated the type to a record type, suggest putting 6842 // a tag in front. 6843 if (const RecordType *RT = T->getAs<RecordType>()) { 6844 RecordDecl *RD = RT->getDecl(); 6845 6846 std::string InsertionText = std::string(" ") + RD->getKindName(); 6847 6848 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6849 << (unsigned) RD->getTagKind() 6850 << T 6851 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6852 InsertionText); 6853 } else { 6854 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6855 << T 6856 << SourceRange(FriendLoc, TypeRange.getEnd()); 6857 } 6858 } else if (T->getAs<EnumType>()) { 6859 Diag(FriendLoc, diag::ext_enum_friend) 6860 << T 6861 << SourceRange(FriendLoc, TypeRange.getEnd()); 6862 } 6863 } 6864 6865 // C++0x [class.friend]p3: 6866 // If the type specifier in a friend declaration designates a (possibly 6867 // cv-qualified) class type, that class is declared as a friend; otherwise, 6868 // the friend declaration is ignored. 6869 6870 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6871 // in [class.friend]p3 that we do not implement. 6872 6873 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6874} 6875 6876/// Handle a friend tag declaration where the scope specifier was 6877/// templated. 6878Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 6879 unsigned TagSpec, SourceLocation TagLoc, 6880 CXXScopeSpec &SS, 6881 IdentifierInfo *Name, SourceLocation NameLoc, 6882 AttributeList *Attr, 6883 MultiTemplateParamsArg TempParamLists) { 6884 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6885 6886 bool isExplicitSpecialization = false; 6887 unsigned NumMatchedTemplateParamLists = TempParamLists.size(); 6888 bool Invalid = false; 6889 6890 if (TemplateParameterList *TemplateParams 6891 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 6892 TempParamLists.get(), 6893 TempParamLists.size(), 6894 /*friend*/ true, 6895 isExplicitSpecialization, 6896 Invalid)) { 6897 --NumMatchedTemplateParamLists; 6898 6899 if (TemplateParams->size() > 0) { 6900 // This is a declaration of a class template. 6901 if (Invalid) 6902 return 0; 6903 6904 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 6905 SS, Name, NameLoc, Attr, 6906 TemplateParams, AS_public).take(); 6907 } else { 6908 // The "template<>" header is extraneous. 6909 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6910 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6911 isExplicitSpecialization = true; 6912 } 6913 } 6914 6915 if (Invalid) return 0; 6916 6917 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 6918 6919 bool isAllExplicitSpecializations = true; 6920 for (unsigned I = 0; I != NumMatchedTemplateParamLists; ++I) { 6921 if (TempParamLists.get()[I]->size()) { 6922 isAllExplicitSpecializations = false; 6923 break; 6924 } 6925 } 6926 6927 // FIXME: don't ignore attributes. 6928 6929 // If it's explicit specializations all the way down, just forget 6930 // about the template header and build an appropriate non-templated 6931 // friend. TODO: for source fidelity, remember the headers. 6932 if (isAllExplicitSpecializations) { 6933 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6934 ElaboratedTypeKeyword Keyword 6935 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6936 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 6937 *Name, NameLoc); 6938 if (T.isNull()) 6939 return 0; 6940 6941 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6942 if (isa<DependentNameType>(T)) { 6943 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6944 TL.setKeywordLoc(TagLoc); 6945 TL.setQualifierLoc(QualifierLoc); 6946 TL.setNameLoc(NameLoc); 6947 } else { 6948 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 6949 TL.setKeywordLoc(TagLoc); 6950 TL.setQualifierLoc(QualifierLoc); 6951 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 6952 } 6953 6954 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6955 TSI, FriendLoc); 6956 Friend->setAccess(AS_public); 6957 CurContext->addDecl(Friend); 6958 return Friend; 6959 } 6960 6961 // Handle the case of a templated-scope friend class. e.g. 6962 // template <class T> class A<T>::B; 6963 // FIXME: we don't support these right now. 6964 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 6965 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 6966 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 6967 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 6968 TL.setKeywordLoc(TagLoc); 6969 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 6970 TL.setNameLoc(NameLoc); 6971 6972 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 6973 TSI, FriendLoc); 6974 Friend->setAccess(AS_public); 6975 Friend->setUnsupportedFriend(true); 6976 CurContext->addDecl(Friend); 6977 return Friend; 6978} 6979 6980 6981/// Handle a friend type declaration. This works in tandem with 6982/// ActOnTag. 6983/// 6984/// Notes on friend class templates: 6985/// 6986/// We generally treat friend class declarations as if they were 6987/// declaring a class. So, for example, the elaborated type specifier 6988/// in a friend declaration is required to obey the restrictions of a 6989/// class-head (i.e. no typedefs in the scope chain), template 6990/// parameters are required to match up with simple template-ids, &c. 6991/// However, unlike when declaring a template specialization, it's 6992/// okay to refer to a template specialization without an empty 6993/// template parameter declaration, e.g. 6994/// friend class A<T>::B<unsigned>; 6995/// We permit this as a special case; if there are any template 6996/// parameters present at all, require proper matching, i.e. 6997/// template <> template <class T> friend class A<int>::B; 6998Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6999 MultiTemplateParamsArg TempParams) { 7000 SourceLocation Loc = DS.getSourceRange().getBegin(); 7001 7002 assert(DS.isFriendSpecified()); 7003 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7004 7005 // Try to convert the decl specifier to a type. This works for 7006 // friend templates because ActOnTag never produces a ClassTemplateDecl 7007 // for a TUK_Friend. 7008 Declarator TheDeclarator(DS, Declarator::MemberContext); 7009 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7010 QualType T = TSI->getType(); 7011 if (TheDeclarator.isInvalidType()) 7012 return 0; 7013 7014 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7015 return 0; 7016 7017 // This is definitely an error in C++98. It's probably meant to 7018 // be forbidden in C++0x, too, but the specification is just 7019 // poorly written. 7020 // 7021 // The problem is with declarations like the following: 7022 // template <T> friend A<T>::foo; 7023 // where deciding whether a class C is a friend or not now hinges 7024 // on whether there exists an instantiation of A that causes 7025 // 'foo' to equal C. There are restrictions on class-heads 7026 // (which we declare (by fiat) elaborated friend declarations to 7027 // be) that makes this tractable. 7028 // 7029 // FIXME: handle "template <> friend class A<T>;", which 7030 // is possibly well-formed? Who even knows? 7031 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7032 Diag(Loc, diag::err_tagless_friend_type_template) 7033 << DS.getSourceRange(); 7034 return 0; 7035 } 7036 7037 // C++98 [class.friend]p1: A friend of a class is a function 7038 // or class that is not a member of the class . . . 7039 // This is fixed in DR77, which just barely didn't make the C++03 7040 // deadline. It's also a very silly restriction that seriously 7041 // affects inner classes and which nobody else seems to implement; 7042 // thus we never diagnose it, not even in -pedantic. 7043 // 7044 // But note that we could warn about it: it's always useless to 7045 // friend one of your own members (it's not, however, worthless to 7046 // friend a member of an arbitrary specialization of your template). 7047 7048 Decl *D; 7049 if (unsigned NumTempParamLists = TempParams.size()) 7050 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7051 NumTempParamLists, 7052 TempParams.release(), 7053 TSI, 7054 DS.getFriendSpecLoc()); 7055 else 7056 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7057 7058 if (!D) 7059 return 0; 7060 7061 D->setAccess(AS_public); 7062 CurContext->addDecl(D); 7063 7064 return D; 7065} 7066 7067Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7068 MultiTemplateParamsArg TemplateParams) { 7069 const DeclSpec &DS = D.getDeclSpec(); 7070 7071 assert(DS.isFriendSpecified()); 7072 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7073 7074 SourceLocation Loc = D.getIdentifierLoc(); 7075 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7076 QualType T = TInfo->getType(); 7077 7078 // C++ [class.friend]p1 7079 // A friend of a class is a function or class.... 7080 // Note that this sees through typedefs, which is intended. 7081 // It *doesn't* see through dependent types, which is correct 7082 // according to [temp.arg.type]p3: 7083 // If a declaration acquires a function type through a 7084 // type dependent on a template-parameter and this causes 7085 // a declaration that does not use the syntactic form of a 7086 // function declarator to have a function type, the program 7087 // is ill-formed. 7088 if (!T->isFunctionType()) { 7089 Diag(Loc, diag::err_unexpected_friend); 7090 7091 // It might be worthwhile to try to recover by creating an 7092 // appropriate declaration. 7093 return 0; 7094 } 7095 7096 // C++ [namespace.memdef]p3 7097 // - If a friend declaration in a non-local class first declares a 7098 // class or function, the friend class or function is a member 7099 // of the innermost enclosing namespace. 7100 // - The name of the friend is not found by simple name lookup 7101 // until a matching declaration is provided in that namespace 7102 // scope (either before or after the class declaration granting 7103 // friendship). 7104 // - If a friend function is called, its name may be found by the 7105 // name lookup that considers functions from namespaces and 7106 // classes associated with the types of the function arguments. 7107 // - When looking for a prior declaration of a class or a function 7108 // declared as a friend, scopes outside the innermost enclosing 7109 // namespace scope are not considered. 7110 7111 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7112 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7113 DeclarationName Name = NameInfo.getName(); 7114 assert(Name); 7115 7116 // Check for unexpanded parameter packs. 7117 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7118 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7119 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7120 return 0; 7121 7122 // The context we found the declaration in, or in which we should 7123 // create the declaration. 7124 DeclContext *DC; 7125 Scope *DCScope = S; 7126 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7127 ForRedeclaration); 7128 7129 // FIXME: there are different rules in local classes 7130 7131 // There are four cases here. 7132 // - There's no scope specifier, in which case we just go to the 7133 // appropriate scope and look for a function or function template 7134 // there as appropriate. 7135 // Recover from invalid scope qualifiers as if they just weren't there. 7136 if (SS.isInvalid() || !SS.isSet()) { 7137 // C++0x [namespace.memdef]p3: 7138 // If the name in a friend declaration is neither qualified nor 7139 // a template-id and the declaration is a function or an 7140 // elaborated-type-specifier, the lookup to determine whether 7141 // the entity has been previously declared shall not consider 7142 // any scopes outside the innermost enclosing namespace. 7143 // C++0x [class.friend]p11: 7144 // If a friend declaration appears in a local class and the name 7145 // specified is an unqualified name, a prior declaration is 7146 // looked up without considering scopes that are outside the 7147 // innermost enclosing non-class scope. For a friend function 7148 // declaration, if there is no prior declaration, the program is 7149 // ill-formed. 7150 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7151 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7152 7153 // Find the appropriate context according to the above. 7154 DC = CurContext; 7155 while (true) { 7156 // Skip class contexts. If someone can cite chapter and verse 7157 // for this behavior, that would be nice --- it's what GCC and 7158 // EDG do, and it seems like a reasonable intent, but the spec 7159 // really only says that checks for unqualified existing 7160 // declarations should stop at the nearest enclosing namespace, 7161 // not that they should only consider the nearest enclosing 7162 // namespace. 7163 while (DC->isRecord()) 7164 DC = DC->getParent(); 7165 7166 LookupQualifiedName(Previous, DC); 7167 7168 // TODO: decide what we think about using declarations. 7169 if (isLocal || !Previous.empty()) 7170 break; 7171 7172 if (isTemplateId) { 7173 if (isa<TranslationUnitDecl>(DC)) break; 7174 } else { 7175 if (DC->isFileContext()) break; 7176 } 7177 DC = DC->getParent(); 7178 } 7179 7180 // C++ [class.friend]p1: A friend of a class is a function or 7181 // class that is not a member of the class . . . 7182 // C++0x changes this for both friend types and functions. 7183 // Most C++ 98 compilers do seem to give an error here, so 7184 // we do, too. 7185 if (!Previous.empty() && DC->Equals(CurContext) 7186 && !getLangOptions().CPlusPlus0x) 7187 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7188 7189 DCScope = getScopeForDeclContext(S, DC); 7190 7191 // - There's a non-dependent scope specifier, in which case we 7192 // compute it and do a previous lookup there for a function 7193 // or function template. 7194 } else if (!SS.getScopeRep()->isDependent()) { 7195 DC = computeDeclContext(SS); 7196 if (!DC) return 0; 7197 7198 if (RequireCompleteDeclContext(SS, DC)) return 0; 7199 7200 LookupQualifiedName(Previous, DC); 7201 7202 // Ignore things found implicitly in the wrong scope. 7203 // TODO: better diagnostics for this case. Suggesting the right 7204 // qualified scope would be nice... 7205 LookupResult::Filter F = Previous.makeFilter(); 7206 while (F.hasNext()) { 7207 NamedDecl *D = F.next(); 7208 if (!DC->InEnclosingNamespaceSetOf( 7209 D->getDeclContext()->getRedeclContext())) 7210 F.erase(); 7211 } 7212 F.done(); 7213 7214 if (Previous.empty()) { 7215 D.setInvalidType(); 7216 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7217 return 0; 7218 } 7219 7220 // C++ [class.friend]p1: A friend of a class is a function or 7221 // class that is not a member of the class . . . 7222 if (DC->Equals(CurContext)) 7223 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7224 7225 // - There's a scope specifier that does not match any template 7226 // parameter lists, in which case we use some arbitrary context, 7227 // create a method or method template, and wait for instantiation. 7228 // - There's a scope specifier that does match some template 7229 // parameter lists, which we don't handle right now. 7230 } else { 7231 DC = CurContext; 7232 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7233 } 7234 7235 if (!DC->isRecord()) { 7236 // This implies that it has to be an operator or function. 7237 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7238 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7239 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7240 Diag(Loc, diag::err_introducing_special_friend) << 7241 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7242 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7243 return 0; 7244 } 7245 } 7246 7247 bool Redeclaration = false; 7248 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7249 move(TemplateParams), 7250 IsDefinition, 7251 Redeclaration); 7252 if (!ND) return 0; 7253 7254 assert(ND->getDeclContext() == DC); 7255 assert(ND->getLexicalDeclContext() == CurContext); 7256 7257 // Add the function declaration to the appropriate lookup tables, 7258 // adjusting the redeclarations list as necessary. We don't 7259 // want to do this yet if the friending class is dependent. 7260 // 7261 // Also update the scope-based lookup if the target context's 7262 // lookup context is in lexical scope. 7263 if (!CurContext->isDependentContext()) { 7264 DC = DC->getRedeclContext(); 7265 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7266 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7267 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7268 } 7269 7270 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7271 D.getIdentifierLoc(), ND, 7272 DS.getFriendSpecLoc()); 7273 FrD->setAccess(AS_public); 7274 CurContext->addDecl(FrD); 7275 7276 if (ND->isInvalidDecl()) 7277 FrD->setInvalidDecl(); 7278 else { 7279 FunctionDecl *FD; 7280 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7281 FD = FTD->getTemplatedDecl(); 7282 else 7283 FD = cast<FunctionDecl>(ND); 7284 7285 // Mark templated-scope function declarations as unsupported. 7286 if (FD->getNumTemplateParameterLists()) 7287 FrD->setUnsupportedFriend(true); 7288 } 7289 7290 return ND; 7291} 7292 7293void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7294 AdjustDeclIfTemplate(Dcl); 7295 7296 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7297 if (!Fn) { 7298 Diag(DelLoc, diag::err_deleted_non_function); 7299 return; 7300 } 7301 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7302 Diag(DelLoc, diag::err_deleted_decl_not_first); 7303 Diag(Prev->getLocation(), diag::note_previous_declaration); 7304 // If the declaration wasn't the first, we delete the function anyway for 7305 // recovery. 7306 } 7307 Fn->setDeleted(); 7308} 7309 7310static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7311 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7312 Stmt *SubStmt = *CI; 7313 if (!SubStmt) 7314 continue; 7315 if (isa<ReturnStmt>(SubStmt)) 7316 Self.Diag(SubStmt->getSourceRange().getBegin(), 7317 diag::err_return_in_constructor_handler); 7318 if (!isa<Expr>(SubStmt)) 7319 SearchForReturnInStmt(Self, SubStmt); 7320 } 7321} 7322 7323void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7324 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7325 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7326 SearchForReturnInStmt(*this, Handler); 7327 } 7328} 7329 7330bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7331 const CXXMethodDecl *Old) { 7332 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7333 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7334 7335 if (Context.hasSameType(NewTy, OldTy) || 7336 NewTy->isDependentType() || OldTy->isDependentType()) 7337 return false; 7338 7339 // Check if the return types are covariant 7340 QualType NewClassTy, OldClassTy; 7341 7342 /// Both types must be pointers or references to classes. 7343 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7344 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7345 NewClassTy = NewPT->getPointeeType(); 7346 OldClassTy = OldPT->getPointeeType(); 7347 } 7348 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7349 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7350 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7351 NewClassTy = NewRT->getPointeeType(); 7352 OldClassTy = OldRT->getPointeeType(); 7353 } 7354 } 7355 } 7356 7357 // The return types aren't either both pointers or references to a class type. 7358 if (NewClassTy.isNull()) { 7359 Diag(New->getLocation(), 7360 diag::err_different_return_type_for_overriding_virtual_function) 7361 << New->getDeclName() << NewTy << OldTy; 7362 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7363 7364 return true; 7365 } 7366 7367 // C++ [class.virtual]p6: 7368 // If the return type of D::f differs from the return type of B::f, the 7369 // class type in the return type of D::f shall be complete at the point of 7370 // declaration of D::f or shall be the class type D. 7371 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7372 if (!RT->isBeingDefined() && 7373 RequireCompleteType(New->getLocation(), NewClassTy, 7374 PDiag(diag::err_covariant_return_incomplete) 7375 << New->getDeclName())) 7376 return true; 7377 } 7378 7379 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7380 // Check if the new class derives from the old class. 7381 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7382 Diag(New->getLocation(), 7383 diag::err_covariant_return_not_derived) 7384 << New->getDeclName() << NewTy << OldTy; 7385 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7386 return true; 7387 } 7388 7389 // Check if we the conversion from derived to base is valid. 7390 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7391 diag::err_covariant_return_inaccessible_base, 7392 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7393 // FIXME: Should this point to the return type? 7394 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7395 // FIXME: this note won't trigger for delayed access control 7396 // diagnostics, and it's impossible to get an undelayed error 7397 // here from access control during the original parse because 7398 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7399 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7400 return true; 7401 } 7402 } 7403 7404 // The qualifiers of the return types must be the same. 7405 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7406 Diag(New->getLocation(), 7407 diag::err_covariant_return_type_different_qualifications) 7408 << New->getDeclName() << NewTy << OldTy; 7409 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7410 return true; 7411 }; 7412 7413 7414 // The new class type must have the same or less qualifiers as the old type. 7415 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7416 Diag(New->getLocation(), 7417 diag::err_covariant_return_type_class_type_more_qualified) 7418 << New->getDeclName() << NewTy << OldTy; 7419 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7420 return true; 7421 }; 7422 7423 return false; 7424} 7425 7426/// \brief Mark the given method pure. 7427/// 7428/// \param Method the method to be marked pure. 7429/// 7430/// \param InitRange the source range that covers the "0" initializer. 7431bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7432 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7433 Method->setPure(); 7434 return false; 7435 } 7436 7437 if (!Method->isInvalidDecl()) 7438 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7439 << Method->getDeclName() << InitRange; 7440 return true; 7441} 7442 7443/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7444/// an initializer for the out-of-line declaration 'Dcl'. The scope 7445/// is a fresh scope pushed for just this purpose. 7446/// 7447/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7448/// static data member of class X, names should be looked up in the scope of 7449/// class X. 7450void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7451 // If there is no declaration, there was an error parsing it. 7452 if (D == 0) return; 7453 7454 // We should only get called for declarations with scope specifiers, like: 7455 // int foo::bar; 7456 assert(D->isOutOfLine()); 7457 EnterDeclaratorContext(S, D->getDeclContext()); 7458} 7459 7460/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7461/// initializer for the out-of-line declaration 'D'. 7462void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7463 // If there is no declaration, there was an error parsing it. 7464 if (D == 0) return; 7465 7466 assert(D->isOutOfLine()); 7467 ExitDeclaratorContext(S); 7468} 7469 7470/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7471/// C++ if/switch/while/for statement. 7472/// e.g: "if (int x = f()) {...}" 7473DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7474 // C++ 6.4p2: 7475 // The declarator shall not specify a function or an array. 7476 // The type-specifier-seq shall not contain typedef and shall not declare a 7477 // new class or enumeration. 7478 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7479 "Parser allowed 'typedef' as storage class of condition decl."); 7480 7481 TagDecl *OwnedTag = 0; 7482 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7483 QualType Ty = TInfo->getType(); 7484 7485 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7486 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7487 // would be created and CXXConditionDeclExpr wants a VarDecl. 7488 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7489 << D.getSourceRange(); 7490 return DeclResult(); 7491 } else if (OwnedTag && OwnedTag->isDefinition()) { 7492 // The type-specifier-seq shall not declare a new class or enumeration. 7493 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7494 } 7495 7496 Decl *Dcl = ActOnDeclarator(S, D); 7497 if (!Dcl) 7498 return DeclResult(); 7499 7500 return Dcl; 7501} 7502 7503void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7504 bool DefinitionRequired) { 7505 // Ignore any vtable uses in unevaluated operands or for classes that do 7506 // not have a vtable. 7507 if (!Class->isDynamicClass() || Class->isDependentContext() || 7508 CurContext->isDependentContext() || 7509 ExprEvalContexts.back().Context == Unevaluated) 7510 return; 7511 7512 // Try to insert this class into the map. 7513 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7514 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7515 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7516 if (!Pos.second) { 7517 // If we already had an entry, check to see if we are promoting this vtable 7518 // to required a definition. If so, we need to reappend to the VTableUses 7519 // list, since we may have already processed the first entry. 7520 if (DefinitionRequired && !Pos.first->second) { 7521 Pos.first->second = true; 7522 } else { 7523 // Otherwise, we can early exit. 7524 return; 7525 } 7526 } 7527 7528 // Local classes need to have their virtual members marked 7529 // immediately. For all other classes, we mark their virtual members 7530 // at the end of the translation unit. 7531 if (Class->isLocalClass()) 7532 MarkVirtualMembersReferenced(Loc, Class); 7533 else 7534 VTableUses.push_back(std::make_pair(Class, Loc)); 7535} 7536 7537bool Sema::DefineUsedVTables() { 7538 if (VTableUses.empty()) 7539 return false; 7540 7541 // Note: The VTableUses vector could grow as a result of marking 7542 // the members of a class as "used", so we check the size each 7543 // time through the loop and prefer indices (with are stable) to 7544 // iterators (which are not). 7545 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7546 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7547 if (!Class) 7548 continue; 7549 7550 SourceLocation Loc = VTableUses[I].second; 7551 7552 // If this class has a key function, but that key function is 7553 // defined in another translation unit, we don't need to emit the 7554 // vtable even though we're using it. 7555 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7556 if (KeyFunction && !KeyFunction->hasBody()) { 7557 switch (KeyFunction->getTemplateSpecializationKind()) { 7558 case TSK_Undeclared: 7559 case TSK_ExplicitSpecialization: 7560 case TSK_ExplicitInstantiationDeclaration: 7561 // The key function is in another translation unit. 7562 continue; 7563 7564 case TSK_ExplicitInstantiationDefinition: 7565 case TSK_ImplicitInstantiation: 7566 // We will be instantiating the key function. 7567 break; 7568 } 7569 } else if (!KeyFunction) { 7570 // If we have a class with no key function that is the subject 7571 // of an explicit instantiation declaration, suppress the 7572 // vtable; it will live with the explicit instantiation 7573 // definition. 7574 bool IsExplicitInstantiationDeclaration 7575 = Class->getTemplateSpecializationKind() 7576 == TSK_ExplicitInstantiationDeclaration; 7577 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7578 REnd = Class->redecls_end(); 7579 R != REnd; ++R) { 7580 TemplateSpecializationKind TSK 7581 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7582 if (TSK == TSK_ExplicitInstantiationDeclaration) 7583 IsExplicitInstantiationDeclaration = true; 7584 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7585 IsExplicitInstantiationDeclaration = false; 7586 break; 7587 } 7588 } 7589 7590 if (IsExplicitInstantiationDeclaration) 7591 continue; 7592 } 7593 7594 // Mark all of the virtual members of this class as referenced, so 7595 // that we can build a vtable. Then, tell the AST consumer that a 7596 // vtable for this class is required. 7597 MarkVirtualMembersReferenced(Loc, Class); 7598 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7599 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7600 7601 // Optionally warn if we're emitting a weak vtable. 7602 if (Class->getLinkage() == ExternalLinkage && 7603 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7604 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7605 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7606 } 7607 } 7608 VTableUses.clear(); 7609 7610 return true; 7611} 7612 7613void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7614 const CXXRecordDecl *RD) { 7615 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7616 e = RD->method_end(); i != e; ++i) { 7617 CXXMethodDecl *MD = *i; 7618 7619 // C++ [basic.def.odr]p2: 7620 // [...] A virtual member function is used if it is not pure. [...] 7621 if (MD->isVirtual() && !MD->isPure()) 7622 MarkDeclarationReferenced(Loc, MD); 7623 } 7624 7625 // Only classes that have virtual bases need a VTT. 7626 if (RD->getNumVBases() == 0) 7627 return; 7628 7629 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7630 e = RD->bases_end(); i != e; ++i) { 7631 const CXXRecordDecl *Base = 7632 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7633 if (Base->getNumVBases() == 0) 7634 continue; 7635 MarkVirtualMembersReferenced(Loc, Base); 7636 } 7637} 7638 7639/// SetIvarInitializers - This routine builds initialization ASTs for the 7640/// Objective-C implementation whose ivars need be initialized. 7641void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7642 if (!getLangOptions().CPlusPlus) 7643 return; 7644 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7645 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7646 CollectIvarsToConstructOrDestruct(OID, ivars); 7647 if (ivars.empty()) 7648 return; 7649 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7650 for (unsigned i = 0; i < ivars.size(); i++) { 7651 FieldDecl *Field = ivars[i]; 7652 if (Field->isInvalidDecl()) 7653 continue; 7654 7655 CXXCtorInitializer *Member; 7656 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7657 InitializationKind InitKind = 7658 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7659 7660 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7661 ExprResult MemberInit = 7662 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7663 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7664 // Note, MemberInit could actually come back empty if no initialization 7665 // is required (e.g., because it would call a trivial default constructor) 7666 if (!MemberInit.get() || MemberInit.isInvalid()) 7667 continue; 7668 7669 Member = 7670 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7671 SourceLocation(), 7672 MemberInit.takeAs<Expr>(), 7673 SourceLocation()); 7674 AllToInit.push_back(Member); 7675 7676 // Be sure that the destructor is accessible and is marked as referenced. 7677 if (const RecordType *RecordTy 7678 = Context.getBaseElementType(Field->getType()) 7679 ->getAs<RecordType>()) { 7680 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7681 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7682 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7683 CheckDestructorAccess(Field->getLocation(), Destructor, 7684 PDiag(diag::err_access_dtor_ivar) 7685 << Context.getBaseElementType(Field->getType())); 7686 } 7687 } 7688 } 7689 ObjCImplementation->setIvarInitializers(Context, 7690 AllToInit.data(), AllToInit.size()); 7691 } 7692} 7693