SemaDeclCXX.cpp revision 788440378c442562497c09610939cbe6218ab43d
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()) { 291 292 unsigned DiagDefaultParamID = 293 diag::err_param_default_argument_redefinition; 294 295 // MSVC accepts that default parameters be redefined for member functions 296 // of template class. The new default parameter's value is ignored. 297 Invalid = true; 298 if (getLangOptions().Microsoft) { 299 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 300 if (MD && MD->getParent()->getDescribedClassTemplate()) { 301 // Merge the old default argument into the new parameter. 302 NewParam->setHasInheritedDefaultArg(); 303 if (OldParam->hasUninstantiatedDefaultArg()) 304 NewParam->setUninstantiatedDefaultArg( 305 OldParam->getUninstantiatedDefaultArg()); 306 else 307 NewParam->setDefaultArg(OldParam->getInit()); 308 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 309 Invalid = false; 310 } 311 } 312 313 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 314 // hint here. Alternatively, we could walk the type-source information 315 // for NewParam to find the last source location in the type... but it 316 // isn't worth the effort right now. This is the kind of test case that 317 // is hard to get right: 318 // int f(int); 319 // void g(int (*fp)(int) = f); 320 // void g(int (*fp)(int) = &f); 321 Diag(NewParam->getLocation(), DiagDefaultParamID) 322 << NewParam->getDefaultArgRange(); 323 324 // Look for the function declaration where the default argument was 325 // actually written, which may be a declaration prior to Old. 326 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 327 Older; Older = Older->getPreviousDeclaration()) { 328 if (!Older->getParamDecl(p)->hasDefaultArg()) 329 break; 330 331 OldParam = Older->getParamDecl(p); 332 } 333 334 Diag(OldParam->getLocation(), diag::note_previous_definition) 335 << OldParam->getDefaultArgRange(); 336 } else if (OldParam->hasDefaultArg()) { 337 // Merge the old default argument into the new parameter. 338 // It's important to use getInit() here; getDefaultArg() 339 // strips off any top-level ExprWithCleanups. 340 NewParam->setHasInheritedDefaultArg(); 341 if (OldParam->hasUninstantiatedDefaultArg()) 342 NewParam->setUninstantiatedDefaultArg( 343 OldParam->getUninstantiatedDefaultArg()); 344 else 345 NewParam->setDefaultArg(OldParam->getInit()); 346 } else if (NewParam->hasDefaultArg()) { 347 if (New->getDescribedFunctionTemplate()) { 348 // Paragraph 4, quoted above, only applies to non-template functions. 349 Diag(NewParam->getLocation(), 350 diag::err_param_default_argument_template_redecl) 351 << NewParam->getDefaultArgRange(); 352 Diag(Old->getLocation(), diag::note_template_prev_declaration) 353 << false; 354 } else if (New->getTemplateSpecializationKind() 355 != TSK_ImplicitInstantiation && 356 New->getTemplateSpecializationKind() != TSK_Undeclared) { 357 // C++ [temp.expr.spec]p21: 358 // Default function arguments shall not be specified in a declaration 359 // or a definition for one of the following explicit specializations: 360 // - the explicit specialization of a function template; 361 // - the explicit specialization of a member function template; 362 // - the explicit specialization of a member function of a class 363 // template where the class template specialization to which the 364 // member function specialization belongs is implicitly 365 // instantiated. 366 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 367 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 368 << New->getDeclName() 369 << NewParam->getDefaultArgRange(); 370 } else if (New->getDeclContext()->isDependentContext()) { 371 // C++ [dcl.fct.default]p6 (DR217): 372 // Default arguments for a member function of a class template shall 373 // be specified on the initial declaration of the member function 374 // within the class template. 375 // 376 // Reading the tea leaves a bit in DR217 and its reference to DR205 377 // leads me to the conclusion that one cannot add default function 378 // arguments for an out-of-line definition of a member function of a 379 // dependent type. 380 int WhichKind = 2; 381 if (CXXRecordDecl *Record 382 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 383 if (Record->getDescribedClassTemplate()) 384 WhichKind = 0; 385 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 386 WhichKind = 1; 387 else 388 WhichKind = 2; 389 } 390 391 Diag(NewParam->getLocation(), 392 diag::err_param_default_argument_member_template_redecl) 393 << WhichKind 394 << NewParam->getDefaultArgRange(); 395 } 396 } 397 } 398 399 if (CheckEquivalentExceptionSpec(Old, New)) 400 Invalid = true; 401 402 return Invalid; 403} 404 405/// \brief Merge the exception specifications of two variable declarations. 406/// 407/// This is called when there's a redeclaration of a VarDecl. The function 408/// checks if the redeclaration might have an exception specification and 409/// validates compatibility and merges the specs if necessary. 410void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 411 // Shortcut if exceptions are disabled. 412 if (!getLangOptions().CXXExceptions) 413 return; 414 415 assert(Context.hasSameType(New->getType(), Old->getType()) && 416 "Should only be called if types are otherwise the same."); 417 418 QualType NewType = New->getType(); 419 QualType OldType = Old->getType(); 420 421 // We're only interested in pointers and references to functions, as well 422 // as pointers to member functions. 423 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 424 NewType = R->getPointeeType(); 425 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 426 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 427 NewType = P->getPointeeType(); 428 OldType = OldType->getAs<PointerType>()->getPointeeType(); 429 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 430 NewType = M->getPointeeType(); 431 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 432 } 433 434 if (!NewType->isFunctionProtoType()) 435 return; 436 437 // There's lots of special cases for functions. For function pointers, system 438 // libraries are hopefully not as broken so that we don't need these 439 // workarounds. 440 if (CheckEquivalentExceptionSpec( 441 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 442 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 443 New->setInvalidDecl(); 444 } 445} 446 447/// CheckCXXDefaultArguments - Verify that the default arguments for a 448/// function declaration are well-formed according to C++ 449/// [dcl.fct.default]. 450void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 451 unsigned NumParams = FD->getNumParams(); 452 unsigned p; 453 454 // Find first parameter with a default argument 455 for (p = 0; p < NumParams; ++p) { 456 ParmVarDecl *Param = FD->getParamDecl(p); 457 if (Param->hasDefaultArg()) 458 break; 459 } 460 461 // C++ [dcl.fct.default]p4: 462 // In a given function declaration, all parameters 463 // subsequent to a parameter with a default argument shall 464 // have default arguments supplied in this or previous 465 // declarations. A default argument shall not be redefined 466 // by a later declaration (not even to the same value). 467 unsigned LastMissingDefaultArg = 0; 468 for (; p < NumParams; ++p) { 469 ParmVarDecl *Param = FD->getParamDecl(p); 470 if (!Param->hasDefaultArg()) { 471 if (Param->isInvalidDecl()) 472 /* We already complained about this parameter. */; 473 else if (Param->getIdentifier()) 474 Diag(Param->getLocation(), 475 diag::err_param_default_argument_missing_name) 476 << Param->getIdentifier(); 477 else 478 Diag(Param->getLocation(), 479 diag::err_param_default_argument_missing); 480 481 LastMissingDefaultArg = p; 482 } 483 } 484 485 if (LastMissingDefaultArg > 0) { 486 // Some default arguments were missing. Clear out all of the 487 // default arguments up to (and including) the last missing 488 // default argument, so that we leave the function parameters 489 // in a semantically valid state. 490 for (p = 0; p <= LastMissingDefaultArg; ++p) { 491 ParmVarDecl *Param = FD->getParamDecl(p); 492 if (Param->hasDefaultArg()) { 493 Param->setDefaultArg(0); 494 } 495 } 496 } 497} 498 499/// isCurrentClassName - Determine whether the identifier II is the 500/// name of the class type currently being defined. In the case of 501/// nested classes, this will only return true if II is the name of 502/// the innermost class. 503bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 504 const CXXScopeSpec *SS) { 505 assert(getLangOptions().CPlusPlus && "No class names in C!"); 506 507 CXXRecordDecl *CurDecl; 508 if (SS && SS->isSet() && !SS->isInvalid()) { 509 DeclContext *DC = computeDeclContext(*SS, true); 510 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 511 } else 512 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 513 514 if (CurDecl && CurDecl->getIdentifier()) 515 return &II == CurDecl->getIdentifier(); 516 else 517 return false; 518} 519 520/// \brief Check the validity of a C++ base class specifier. 521/// 522/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 523/// and returns NULL otherwise. 524CXXBaseSpecifier * 525Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 526 SourceRange SpecifierRange, 527 bool Virtual, AccessSpecifier Access, 528 TypeSourceInfo *TInfo, 529 SourceLocation EllipsisLoc) { 530 QualType BaseType = TInfo->getType(); 531 532 // C++ [class.union]p1: 533 // A union shall not have base classes. 534 if (Class->isUnion()) { 535 Diag(Class->getLocation(), diag::err_base_clause_on_union) 536 << SpecifierRange; 537 return 0; 538 } 539 540 if (EllipsisLoc.isValid() && 541 !TInfo->getType()->containsUnexpandedParameterPack()) { 542 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 543 << TInfo->getTypeLoc().getSourceRange(); 544 EllipsisLoc = SourceLocation(); 545 } 546 547 if (BaseType->isDependentType()) 548 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 549 Class->getTagKind() == TTK_Class, 550 Access, TInfo, EllipsisLoc); 551 552 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 553 554 // Base specifiers must be record types. 555 if (!BaseType->isRecordType()) { 556 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 557 return 0; 558 } 559 560 // C++ [class.union]p1: 561 // A union shall not be used as a base class. 562 if (BaseType->isUnionType()) { 563 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 564 return 0; 565 } 566 567 // C++ [class.derived]p2: 568 // The class-name in a base-specifier shall not be an incompletely 569 // defined class. 570 if (RequireCompleteType(BaseLoc, BaseType, 571 PDiag(diag::err_incomplete_base_class) 572 << SpecifierRange)) { 573 Class->setInvalidDecl(); 574 return 0; 575 } 576 577 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 578 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 579 assert(BaseDecl && "Record type has no declaration"); 580 BaseDecl = BaseDecl->getDefinition(); 581 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 582 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 583 assert(CXXBaseDecl && "Base type is not a C++ type"); 584 585 // C++ [class]p3: 586 // If a class is marked final and it appears as a base-type-specifier in 587 // base-clause, the program is ill-formed. 588 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 589 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 590 << CXXBaseDecl->getDeclName(); 591 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 592 << CXXBaseDecl->getDeclName(); 593 return 0; 594 } 595 596 if (BaseDecl->isInvalidDecl()) 597 Class->setInvalidDecl(); 598 599 // Create the base specifier. 600 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 601 Class->getTagKind() == TTK_Class, 602 Access, TInfo, EllipsisLoc); 603} 604 605/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 606/// one entry in the base class list of a class specifier, for 607/// example: 608/// class foo : public bar, virtual private baz { 609/// 'public bar' and 'virtual private baz' are each base-specifiers. 610BaseResult 611Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 612 bool Virtual, AccessSpecifier Access, 613 ParsedType basetype, SourceLocation BaseLoc, 614 SourceLocation EllipsisLoc) { 615 if (!classdecl) 616 return true; 617 618 AdjustDeclIfTemplate(classdecl); 619 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 620 if (!Class) 621 return true; 622 623 TypeSourceInfo *TInfo = 0; 624 GetTypeFromParser(basetype, &TInfo); 625 626 if (EllipsisLoc.isInvalid() && 627 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 628 UPPC_BaseType)) 629 return true; 630 631 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 632 Virtual, Access, TInfo, 633 EllipsisLoc)) 634 return BaseSpec; 635 636 return true; 637} 638 639/// \brief Performs the actual work of attaching the given base class 640/// specifiers to a C++ class. 641bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 642 unsigned NumBases) { 643 if (NumBases == 0) 644 return false; 645 646 // Used to keep track of which base types we have already seen, so 647 // that we can properly diagnose redundant direct base types. Note 648 // that the key is always the unqualified canonical type of the base 649 // class. 650 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 651 652 // Copy non-redundant base specifiers into permanent storage. 653 unsigned NumGoodBases = 0; 654 bool Invalid = false; 655 for (unsigned idx = 0; idx < NumBases; ++idx) { 656 QualType NewBaseType 657 = Context.getCanonicalType(Bases[idx]->getType()); 658 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 659 if (!Class->hasObjectMember()) { 660 if (const RecordType *FDTTy = 661 NewBaseType.getTypePtr()->getAs<RecordType>()) 662 if (FDTTy->getDecl()->hasObjectMember()) 663 Class->setHasObjectMember(true); 664 } 665 666 if (KnownBaseTypes[NewBaseType]) { 667 // C++ [class.mi]p3: 668 // A class shall not be specified as a direct base class of a 669 // derived class more than once. 670 Diag(Bases[idx]->getSourceRange().getBegin(), 671 diag::err_duplicate_base_class) 672 << KnownBaseTypes[NewBaseType]->getType() 673 << Bases[idx]->getSourceRange(); 674 675 // Delete the duplicate base class specifier; we're going to 676 // overwrite its pointer later. 677 Context.Deallocate(Bases[idx]); 678 679 Invalid = true; 680 } else { 681 // Okay, add this new base class. 682 KnownBaseTypes[NewBaseType] = Bases[idx]; 683 Bases[NumGoodBases++] = Bases[idx]; 684 } 685 } 686 687 // Attach the remaining base class specifiers to the derived class. 688 Class->setBases(Bases, NumGoodBases); 689 690 // Delete the remaining (good) base class specifiers, since their 691 // data has been copied into the CXXRecordDecl. 692 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 693 Context.Deallocate(Bases[idx]); 694 695 return Invalid; 696} 697 698/// ActOnBaseSpecifiers - Attach the given base specifiers to the 699/// class, after checking whether there are any duplicate base 700/// classes. 701void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 702 unsigned NumBases) { 703 if (!ClassDecl || !Bases || !NumBases) 704 return; 705 706 AdjustDeclIfTemplate(ClassDecl); 707 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 708 (CXXBaseSpecifier**)(Bases), NumBases); 709} 710 711static CXXRecordDecl *GetClassForType(QualType T) { 712 if (const RecordType *RT = T->getAs<RecordType>()) 713 return cast<CXXRecordDecl>(RT->getDecl()); 714 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 715 return ICT->getDecl(); 716 else 717 return 0; 718} 719 720/// \brief Determine whether the type \p Derived is a C++ class that is 721/// derived from the type \p Base. 722bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 723 if (!getLangOptions().CPlusPlus) 724 return false; 725 726 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 727 if (!DerivedRD) 728 return false; 729 730 CXXRecordDecl *BaseRD = GetClassForType(Base); 731 if (!BaseRD) 732 return false; 733 734 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 735 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 736} 737 738/// \brief Determine whether the type \p Derived is a C++ class that is 739/// derived from the type \p Base. 740bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 741 if (!getLangOptions().CPlusPlus) 742 return false; 743 744 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 745 if (!DerivedRD) 746 return false; 747 748 CXXRecordDecl *BaseRD = GetClassForType(Base); 749 if (!BaseRD) 750 return false; 751 752 return DerivedRD->isDerivedFrom(BaseRD, Paths); 753} 754 755void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 756 CXXCastPath &BasePathArray) { 757 assert(BasePathArray.empty() && "Base path array must be empty!"); 758 assert(Paths.isRecordingPaths() && "Must record paths!"); 759 760 const CXXBasePath &Path = Paths.front(); 761 762 // We first go backward and check if we have a virtual base. 763 // FIXME: It would be better if CXXBasePath had the base specifier for 764 // the nearest virtual base. 765 unsigned Start = 0; 766 for (unsigned I = Path.size(); I != 0; --I) { 767 if (Path[I - 1].Base->isVirtual()) { 768 Start = I - 1; 769 break; 770 } 771 } 772 773 // Now add all bases. 774 for (unsigned I = Start, E = Path.size(); I != E; ++I) 775 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 776} 777 778/// \brief Determine whether the given base path includes a virtual 779/// base class. 780bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 781 for (CXXCastPath::const_iterator B = BasePath.begin(), 782 BEnd = BasePath.end(); 783 B != BEnd; ++B) 784 if ((*B)->isVirtual()) 785 return true; 786 787 return false; 788} 789 790/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 791/// conversion (where Derived and Base are class types) is 792/// well-formed, meaning that the conversion is unambiguous (and 793/// that all of the base classes are accessible). Returns true 794/// and emits a diagnostic if the code is ill-formed, returns false 795/// otherwise. Loc is the location where this routine should point to 796/// if there is an error, and Range is the source range to highlight 797/// if there is an error. 798bool 799Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 800 unsigned InaccessibleBaseID, 801 unsigned AmbigiousBaseConvID, 802 SourceLocation Loc, SourceRange Range, 803 DeclarationName Name, 804 CXXCastPath *BasePath) { 805 // First, determine whether the path from Derived to Base is 806 // ambiguous. This is slightly more expensive than checking whether 807 // the Derived to Base conversion exists, because here we need to 808 // explore multiple paths to determine if there is an ambiguity. 809 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 810 /*DetectVirtual=*/false); 811 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 812 assert(DerivationOkay && 813 "Can only be used with a derived-to-base conversion"); 814 (void)DerivationOkay; 815 816 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 817 if (InaccessibleBaseID) { 818 // Check that the base class can be accessed. 819 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 820 InaccessibleBaseID)) { 821 case AR_inaccessible: 822 return true; 823 case AR_accessible: 824 case AR_dependent: 825 case AR_delayed: 826 break; 827 } 828 } 829 830 // Build a base path if necessary. 831 if (BasePath) 832 BuildBasePathArray(Paths, *BasePath); 833 return false; 834 } 835 836 // We know that the derived-to-base conversion is ambiguous, and 837 // we're going to produce a diagnostic. Perform the derived-to-base 838 // search just one more time to compute all of the possible paths so 839 // that we can print them out. This is more expensive than any of 840 // the previous derived-to-base checks we've done, but at this point 841 // performance isn't as much of an issue. 842 Paths.clear(); 843 Paths.setRecordingPaths(true); 844 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 845 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 846 (void)StillOkay; 847 848 // Build up a textual representation of the ambiguous paths, e.g., 849 // D -> B -> A, that will be used to illustrate the ambiguous 850 // conversions in the diagnostic. We only print one of the paths 851 // to each base class subobject. 852 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 853 854 Diag(Loc, AmbigiousBaseConvID) 855 << Derived << Base << PathDisplayStr << Range << Name; 856 return true; 857} 858 859bool 860Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 861 SourceLocation Loc, SourceRange Range, 862 CXXCastPath *BasePath, 863 bool IgnoreAccess) { 864 return CheckDerivedToBaseConversion(Derived, Base, 865 IgnoreAccess ? 0 866 : diag::err_upcast_to_inaccessible_base, 867 diag::err_ambiguous_derived_to_base_conv, 868 Loc, Range, DeclarationName(), 869 BasePath); 870} 871 872 873/// @brief Builds a string representing ambiguous paths from a 874/// specific derived class to different subobjects of the same base 875/// class. 876/// 877/// This function builds a string that can be used in error messages 878/// to show the different paths that one can take through the 879/// inheritance hierarchy to go from the derived class to different 880/// subobjects of a base class. The result looks something like this: 881/// @code 882/// struct D -> struct B -> struct A 883/// struct D -> struct C -> struct A 884/// @endcode 885std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 886 std::string PathDisplayStr; 887 std::set<unsigned> DisplayedPaths; 888 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 889 Path != Paths.end(); ++Path) { 890 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 891 // We haven't displayed a path to this particular base 892 // class subobject yet. 893 PathDisplayStr += "\n "; 894 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 895 for (CXXBasePath::const_iterator Element = Path->begin(); 896 Element != Path->end(); ++Element) 897 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 898 } 899 } 900 901 return PathDisplayStr; 902} 903 904//===----------------------------------------------------------------------===// 905// C++ class member Handling 906//===----------------------------------------------------------------------===// 907 908/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 909Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 910 SourceLocation ASLoc, 911 SourceLocation ColonLoc) { 912 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 913 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 914 ASLoc, ColonLoc); 915 CurContext->addHiddenDecl(ASDecl); 916 return ASDecl; 917} 918 919/// CheckOverrideControl - Check C++0x override control semantics. 920void Sema::CheckOverrideControl(const Decl *D) { 921 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 922 if (!MD || !MD->isVirtual()) 923 return; 924 925 if (MD->isDependentContext()) 926 return; 927 928 // C++0x [class.virtual]p3: 929 // If a virtual function is marked with the virt-specifier override and does 930 // not override a member function of a base class, 931 // the program is ill-formed. 932 bool HasOverriddenMethods = 933 MD->begin_overridden_methods() != MD->end_overridden_methods(); 934 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 935 Diag(MD->getLocation(), 936 diag::err_function_marked_override_not_overriding) 937 << MD->getDeclName(); 938 return; 939 } 940} 941 942/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 943/// function overrides a virtual member function marked 'final', according to 944/// C++0x [class.virtual]p3. 945bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 946 const CXXMethodDecl *Old) { 947 if (!Old->hasAttr<FinalAttr>()) 948 return false; 949 950 Diag(New->getLocation(), diag::err_final_function_overridden) 951 << New->getDeclName(); 952 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 953 return true; 954} 955 956/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 957/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 958/// bitfield width if there is one and 'InitExpr' specifies the initializer if 959/// any. 960Decl * 961Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 962 MultiTemplateParamsArg TemplateParameterLists, 963 ExprTy *BW, const VirtSpecifiers &VS, 964 ExprTy *InitExpr, bool IsDefinition, 965 bool Deleted) { 966 const DeclSpec &DS = D.getDeclSpec(); 967 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 968 DeclarationName Name = NameInfo.getName(); 969 SourceLocation Loc = NameInfo.getLoc(); 970 971 // For anonymous bitfields, the location should point to the type. 972 if (Loc.isInvalid()) 973 Loc = D.getSourceRange().getBegin(); 974 975 Expr *BitWidth = static_cast<Expr*>(BW); 976 Expr *Init = static_cast<Expr*>(InitExpr); 977 978 assert(isa<CXXRecordDecl>(CurContext)); 979 assert(!DS.isFriendSpecified()); 980 981 bool isFunc = false; 982 if (D.isFunctionDeclarator()) 983 isFunc = true; 984 else if (D.getNumTypeObjects() == 0 && 985 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 986 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 987 isFunc = TDType->isFunctionType(); 988 } 989 990 // C++ 9.2p6: A member shall not be declared to have automatic storage 991 // duration (auto, register) or with the extern storage-class-specifier. 992 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 993 // data members and cannot be applied to names declared const or static, 994 // and cannot be applied to reference members. 995 switch (DS.getStorageClassSpec()) { 996 case DeclSpec::SCS_unspecified: 997 case DeclSpec::SCS_typedef: 998 case DeclSpec::SCS_static: 999 // FALL THROUGH. 1000 break; 1001 case DeclSpec::SCS_mutable: 1002 if (isFunc) { 1003 if (DS.getStorageClassSpecLoc().isValid()) 1004 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1005 else 1006 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1007 1008 // FIXME: It would be nicer if the keyword was ignored only for this 1009 // declarator. Otherwise we could get follow-up errors. 1010 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1011 } 1012 break; 1013 default: 1014 if (DS.getStorageClassSpecLoc().isValid()) 1015 Diag(DS.getStorageClassSpecLoc(), 1016 diag::err_storageclass_invalid_for_member); 1017 else 1018 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1019 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1020 } 1021 1022 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1023 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1024 !isFunc); 1025 1026 Decl *Member; 1027 if (isInstField) { 1028 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1029 1030 1031 if (SS.isSet() && !SS.isInvalid()) { 1032 // The user provided a superfluous scope specifier inside a class 1033 // definition: 1034 // 1035 // class X { 1036 // int X::member; 1037 // }; 1038 DeclContext *DC = 0; 1039 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1040 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1041 << Name << FixItHint::CreateRemoval(SS.getRange()); 1042 else 1043 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1044 << Name << SS.getRange(); 1045 1046 SS.clear(); 1047 } 1048 1049 // FIXME: Check for template parameters! 1050 // FIXME: Check that the name is an identifier! 1051 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1052 AS); 1053 assert(Member && "HandleField never returns null"); 1054 } else { 1055 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1056 if (!Member) { 1057 return 0; 1058 } 1059 1060 // Non-instance-fields can't have a bitfield. 1061 if (BitWidth) { 1062 if (Member->isInvalidDecl()) { 1063 // don't emit another diagnostic. 1064 } else if (isa<VarDecl>(Member)) { 1065 // C++ 9.6p3: A bit-field shall not be a static member. 1066 // "static member 'A' cannot be a bit-field" 1067 Diag(Loc, diag::err_static_not_bitfield) 1068 << Name << BitWidth->getSourceRange(); 1069 } else if (isa<TypedefDecl>(Member)) { 1070 // "typedef member 'x' cannot be a bit-field" 1071 Diag(Loc, diag::err_typedef_not_bitfield) 1072 << Name << BitWidth->getSourceRange(); 1073 } else { 1074 // A function typedef ("typedef int f(); f a;"). 1075 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1076 Diag(Loc, diag::err_not_integral_type_bitfield) 1077 << Name << cast<ValueDecl>(Member)->getType() 1078 << BitWidth->getSourceRange(); 1079 } 1080 1081 BitWidth = 0; 1082 Member->setInvalidDecl(); 1083 } 1084 1085 Member->setAccess(AS); 1086 1087 // If we have declared a member function template, set the access of the 1088 // templated declaration as well. 1089 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1090 FunTmpl->getTemplatedDecl()->setAccess(AS); 1091 } 1092 1093 if (VS.isOverrideSpecified()) { 1094 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1095 if (!MD || !MD->isVirtual()) { 1096 Diag(Member->getLocStart(), 1097 diag::override_keyword_only_allowed_on_virtual_member_functions) 1098 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1099 } else 1100 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1101 } 1102 if (VS.isFinalSpecified()) { 1103 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1104 if (!MD || !MD->isVirtual()) { 1105 Diag(Member->getLocStart(), 1106 diag::override_keyword_only_allowed_on_virtual_member_functions) 1107 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1108 } else 1109 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1110 } 1111 1112 if (VS.getLastLocation().isValid()) { 1113 // Update the end location of a method that has a virt-specifiers. 1114 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1115 MD->setRangeEnd(VS.getLastLocation()); 1116 } 1117 1118 CheckOverrideControl(Member); 1119 1120 assert((Name || isInstField) && "No identifier for non-field ?"); 1121 1122 if (Init) 1123 AddInitializerToDecl(Member, Init, false, 1124 DS.getTypeSpecType() == DeclSpec::TST_auto); 1125 if (Deleted) // FIXME: Source location is not very good. 1126 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1127 1128 FinalizeDeclaration(Member); 1129 1130 if (isInstField) 1131 FieldCollector->Add(cast<FieldDecl>(Member)); 1132 return Member; 1133} 1134 1135/// \brief Find the direct and/or virtual base specifiers that 1136/// correspond to the given base type, for use in base initialization 1137/// within a constructor. 1138static bool FindBaseInitializer(Sema &SemaRef, 1139 CXXRecordDecl *ClassDecl, 1140 QualType BaseType, 1141 const CXXBaseSpecifier *&DirectBaseSpec, 1142 const CXXBaseSpecifier *&VirtualBaseSpec) { 1143 // First, check for a direct base class. 1144 DirectBaseSpec = 0; 1145 for (CXXRecordDecl::base_class_const_iterator Base 1146 = ClassDecl->bases_begin(); 1147 Base != ClassDecl->bases_end(); ++Base) { 1148 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1149 // We found a direct base of this type. That's what we're 1150 // initializing. 1151 DirectBaseSpec = &*Base; 1152 break; 1153 } 1154 } 1155 1156 // Check for a virtual base class. 1157 // FIXME: We might be able to short-circuit this if we know in advance that 1158 // there are no virtual bases. 1159 VirtualBaseSpec = 0; 1160 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1161 // We haven't found a base yet; search the class hierarchy for a 1162 // virtual base class. 1163 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1164 /*DetectVirtual=*/false); 1165 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1166 BaseType, Paths)) { 1167 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1168 Path != Paths.end(); ++Path) { 1169 if (Path->back().Base->isVirtual()) { 1170 VirtualBaseSpec = Path->back().Base; 1171 break; 1172 } 1173 } 1174 } 1175 } 1176 1177 return DirectBaseSpec || VirtualBaseSpec; 1178} 1179 1180/// ActOnMemInitializer - Handle a C++ member initializer. 1181MemInitResult 1182Sema::ActOnMemInitializer(Decl *ConstructorD, 1183 Scope *S, 1184 CXXScopeSpec &SS, 1185 IdentifierInfo *MemberOrBase, 1186 ParsedType TemplateTypeTy, 1187 SourceLocation IdLoc, 1188 SourceLocation LParenLoc, 1189 ExprTy **Args, unsigned NumArgs, 1190 SourceLocation RParenLoc, 1191 SourceLocation EllipsisLoc) { 1192 if (!ConstructorD) 1193 return true; 1194 1195 AdjustDeclIfTemplate(ConstructorD); 1196 1197 CXXConstructorDecl *Constructor 1198 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1199 if (!Constructor) { 1200 // The user wrote a constructor initializer on a function that is 1201 // not a C++ constructor. Ignore the error for now, because we may 1202 // have more member initializers coming; we'll diagnose it just 1203 // once in ActOnMemInitializers. 1204 return true; 1205 } 1206 1207 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1208 1209 // C++ [class.base.init]p2: 1210 // Names in a mem-initializer-id are looked up in the scope of the 1211 // constructor's class and, if not found in that scope, are looked 1212 // up in the scope containing the constructor's definition. 1213 // [Note: if the constructor's class contains a member with the 1214 // same name as a direct or virtual base class of the class, a 1215 // mem-initializer-id naming the member or base class and composed 1216 // of a single identifier refers to the class member. A 1217 // mem-initializer-id for the hidden base class may be specified 1218 // using a qualified name. ] 1219 if (!SS.getScopeRep() && !TemplateTypeTy) { 1220 // Look for a member, first. 1221 FieldDecl *Member = 0; 1222 DeclContext::lookup_result Result 1223 = ClassDecl->lookup(MemberOrBase); 1224 if (Result.first != Result.second) { 1225 Member = dyn_cast<FieldDecl>(*Result.first); 1226 1227 if (Member) { 1228 if (EllipsisLoc.isValid()) 1229 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1230 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1231 1232 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1233 LParenLoc, RParenLoc); 1234 } 1235 1236 // Handle anonymous union case. 1237 if (IndirectFieldDecl* IndirectField 1238 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1239 if (EllipsisLoc.isValid()) 1240 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1241 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1242 1243 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1244 NumArgs, IdLoc, 1245 LParenLoc, RParenLoc); 1246 } 1247 } 1248 } 1249 // It didn't name a member, so see if it names a class. 1250 QualType BaseType; 1251 TypeSourceInfo *TInfo = 0; 1252 1253 if (TemplateTypeTy) { 1254 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1255 } else { 1256 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1257 LookupParsedName(R, S, &SS); 1258 1259 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1260 if (!TyD) { 1261 if (R.isAmbiguous()) return true; 1262 1263 // We don't want access-control diagnostics here. 1264 R.suppressDiagnostics(); 1265 1266 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1267 bool NotUnknownSpecialization = false; 1268 DeclContext *DC = computeDeclContext(SS, false); 1269 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1270 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1271 1272 if (!NotUnknownSpecialization) { 1273 // When the scope specifier can refer to a member of an unknown 1274 // specialization, we take it as a type name. 1275 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1276 SS.getWithLocInContext(Context), 1277 *MemberOrBase, IdLoc); 1278 if (BaseType.isNull()) 1279 return true; 1280 1281 R.clear(); 1282 R.setLookupName(MemberOrBase); 1283 } 1284 } 1285 1286 // If no results were found, try to correct typos. 1287 if (R.empty() && BaseType.isNull() && 1288 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1289 R.isSingleResult()) { 1290 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1291 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1292 // We have found a non-static data member with a similar 1293 // name to what was typed; complain and initialize that 1294 // member. 1295 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1296 << MemberOrBase << true << R.getLookupName() 1297 << FixItHint::CreateReplacement(R.getNameLoc(), 1298 R.getLookupName().getAsString()); 1299 Diag(Member->getLocation(), diag::note_previous_decl) 1300 << Member->getDeclName(); 1301 1302 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1303 LParenLoc, RParenLoc); 1304 } 1305 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1306 const CXXBaseSpecifier *DirectBaseSpec; 1307 const CXXBaseSpecifier *VirtualBaseSpec; 1308 if (FindBaseInitializer(*this, ClassDecl, 1309 Context.getTypeDeclType(Type), 1310 DirectBaseSpec, VirtualBaseSpec)) { 1311 // We have found a direct or virtual base class with a 1312 // similar name to what was typed; complain and initialize 1313 // that base class. 1314 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1315 << MemberOrBase << false << R.getLookupName() 1316 << FixItHint::CreateReplacement(R.getNameLoc(), 1317 R.getLookupName().getAsString()); 1318 1319 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1320 : VirtualBaseSpec; 1321 Diag(BaseSpec->getSourceRange().getBegin(), 1322 diag::note_base_class_specified_here) 1323 << BaseSpec->getType() 1324 << BaseSpec->getSourceRange(); 1325 1326 TyD = Type; 1327 } 1328 } 1329 } 1330 1331 if (!TyD && BaseType.isNull()) { 1332 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1333 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1334 return true; 1335 } 1336 } 1337 1338 if (BaseType.isNull()) { 1339 BaseType = Context.getTypeDeclType(TyD); 1340 if (SS.isSet()) { 1341 NestedNameSpecifier *Qualifier = 1342 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1343 1344 // FIXME: preserve source range information 1345 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1346 } 1347 } 1348 } 1349 1350 if (!TInfo) 1351 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1352 1353 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1354 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1355} 1356 1357/// Checks an initializer expression for use of uninitialized fields, such as 1358/// containing the field that is being initialized. Returns true if there is an 1359/// uninitialized field was used an updates the SourceLocation parameter; false 1360/// otherwise. 1361static bool InitExprContainsUninitializedFields(const Stmt *S, 1362 const ValueDecl *LhsField, 1363 SourceLocation *L) { 1364 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1365 1366 if (isa<CallExpr>(S)) { 1367 // Do not descend into function calls or constructors, as the use 1368 // of an uninitialized field may be valid. One would have to inspect 1369 // the contents of the function/ctor to determine if it is safe or not. 1370 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1371 // may be safe, depending on what the function/ctor does. 1372 return false; 1373 } 1374 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1375 const NamedDecl *RhsField = ME->getMemberDecl(); 1376 1377 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1378 // The member expression points to a static data member. 1379 assert(VD->isStaticDataMember() && 1380 "Member points to non-static data member!"); 1381 (void)VD; 1382 return false; 1383 } 1384 1385 if (isa<EnumConstantDecl>(RhsField)) { 1386 // The member expression points to an enum. 1387 return false; 1388 } 1389 1390 if (RhsField == LhsField) { 1391 // Initializing a field with itself. Throw a warning. 1392 // But wait; there are exceptions! 1393 // Exception #1: The field may not belong to this record. 1394 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1395 const Expr *base = ME->getBase(); 1396 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1397 // Even though the field matches, it does not belong to this record. 1398 return false; 1399 } 1400 // None of the exceptions triggered; return true to indicate an 1401 // uninitialized field was used. 1402 *L = ME->getMemberLoc(); 1403 return true; 1404 } 1405 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1406 // sizeof/alignof doesn't reference contents, do not warn. 1407 return false; 1408 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1409 // address-of doesn't reference contents (the pointer may be dereferenced 1410 // in the same expression but it would be rare; and weird). 1411 if (UOE->getOpcode() == UO_AddrOf) 1412 return false; 1413 } 1414 for (Stmt::const_child_range it = S->children(); it; ++it) { 1415 if (!*it) { 1416 // An expression such as 'member(arg ?: "")' may trigger this. 1417 continue; 1418 } 1419 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1420 return true; 1421 } 1422 return false; 1423} 1424 1425MemInitResult 1426Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1427 unsigned NumArgs, SourceLocation IdLoc, 1428 SourceLocation LParenLoc, 1429 SourceLocation RParenLoc) { 1430 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1431 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1432 assert((DirectMember || IndirectMember) && 1433 "Member must be a FieldDecl or IndirectFieldDecl"); 1434 1435 if (Member->isInvalidDecl()) 1436 return true; 1437 1438 // Diagnose value-uses of fields to initialize themselves, e.g. 1439 // foo(foo) 1440 // where foo is not also a parameter to the constructor. 1441 // TODO: implement -Wuninitialized and fold this into that framework. 1442 for (unsigned i = 0; i < NumArgs; ++i) { 1443 SourceLocation L; 1444 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1445 // FIXME: Return true in the case when other fields are used before being 1446 // uninitialized. For example, let this field be the i'th field. When 1447 // initializing the i'th field, throw a warning if any of the >= i'th 1448 // fields are used, as they are not yet initialized. 1449 // Right now we are only handling the case where the i'th field uses 1450 // itself in its initializer. 1451 Diag(L, diag::warn_field_is_uninit); 1452 } 1453 } 1454 1455 bool HasDependentArg = false; 1456 for (unsigned i = 0; i < NumArgs; i++) 1457 HasDependentArg |= Args[i]->isTypeDependent(); 1458 1459 Expr *Init; 1460 if (Member->getType()->isDependentType() || HasDependentArg) { 1461 // Can't check initialization for a member of dependent type or when 1462 // any of the arguments are type-dependent expressions. 1463 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1464 RParenLoc); 1465 1466 // Erase any temporaries within this evaluation context; we're not 1467 // going to track them in the AST, since we'll be rebuilding the 1468 // ASTs during template instantiation. 1469 ExprTemporaries.erase( 1470 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1471 ExprTemporaries.end()); 1472 } else { 1473 // Initialize the member. 1474 InitializedEntity MemberEntity = 1475 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1476 : InitializedEntity::InitializeMember(IndirectMember, 0); 1477 InitializationKind Kind = 1478 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1479 1480 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1481 1482 ExprResult MemberInit = 1483 InitSeq.Perform(*this, MemberEntity, Kind, 1484 MultiExprArg(*this, Args, NumArgs), 0); 1485 if (MemberInit.isInvalid()) 1486 return true; 1487 1488 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1489 1490 // C++0x [class.base.init]p7: 1491 // The initialization of each base and member constitutes a 1492 // full-expression. 1493 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1494 if (MemberInit.isInvalid()) 1495 return true; 1496 1497 // If we are in a dependent context, template instantiation will 1498 // perform this type-checking again. Just save the arguments that we 1499 // received in a ParenListExpr. 1500 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1501 // of the information that we have about the member 1502 // initializer. However, deconstructing the ASTs is a dicey process, 1503 // and this approach is far more likely to get the corner cases right. 1504 if (CurContext->isDependentContext()) 1505 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1506 RParenLoc); 1507 else 1508 Init = MemberInit.get(); 1509 } 1510 1511 if (DirectMember) { 1512 return new (Context) CXXCtorInitializer(Context, DirectMember, 1513 IdLoc, LParenLoc, Init, 1514 RParenLoc); 1515 } else { 1516 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1517 IdLoc, LParenLoc, Init, 1518 RParenLoc); 1519 } 1520} 1521 1522MemInitResult 1523Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1524 Expr **Args, unsigned NumArgs, 1525 SourceLocation NameLoc, 1526 SourceLocation LParenLoc, 1527 SourceLocation RParenLoc, 1528 CXXRecordDecl *ClassDecl) { 1529 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1530 if (!LangOpts.CPlusPlus0x) 1531 return Diag(Loc, diag::err_delegation_0x_only) 1532 << TInfo->getTypeLoc().getLocalSourceRange(); 1533 1534 // Initialize the object. 1535 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1536 QualType(ClassDecl->getTypeForDecl(), 0)); 1537 InitializationKind Kind = 1538 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1539 1540 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1541 1542 ExprResult DelegationInit = 1543 InitSeq.Perform(*this, DelegationEntity, Kind, 1544 MultiExprArg(*this, Args, NumArgs), 0); 1545 if (DelegationInit.isInvalid()) 1546 return true; 1547 1548 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1549 CXXConstructorDecl *Constructor = ConExpr->getConstructor(); 1550 assert(Constructor && "Delegating constructor with no target?"); 1551 1552 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1553 1554 // C++0x [class.base.init]p7: 1555 // The initialization of each base and member constitutes a 1556 // full-expression. 1557 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1558 if (DelegationInit.isInvalid()) 1559 return true; 1560 1561 // If we are in a dependent context, template instantiation will 1562 // perform this type-checking again. Just save the arguments that we 1563 // received in a ParenListExpr. 1564 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1565 // of the information that we have about the base 1566 // initializer. However, deconstructing the ASTs is a dicey process, 1567 // and this approach is far more likely to get the corner cases right. 1568 if (CurContext->isDependentContext()) { 1569 ExprResult Init 1570 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1571 NumArgs, RParenLoc)); 1572 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1573 Constructor, Init.takeAs<Expr>(), 1574 RParenLoc); 1575 } 1576 1577 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1578 DelegationInit.takeAs<Expr>(), 1579 RParenLoc); 1580} 1581 1582MemInitResult 1583Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1584 Expr **Args, unsigned NumArgs, 1585 SourceLocation LParenLoc, SourceLocation RParenLoc, 1586 CXXRecordDecl *ClassDecl, 1587 SourceLocation EllipsisLoc) { 1588 bool HasDependentArg = false; 1589 for (unsigned i = 0; i < NumArgs; i++) 1590 HasDependentArg |= Args[i]->isTypeDependent(); 1591 1592 SourceLocation BaseLoc 1593 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1594 1595 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1596 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1597 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1598 1599 // C++ [class.base.init]p2: 1600 // [...] Unless the mem-initializer-id names a nonstatic data 1601 // member of the constructor's class or a direct or virtual base 1602 // of that class, the mem-initializer is ill-formed. A 1603 // mem-initializer-list can initialize a base class using any 1604 // name that denotes that base class type. 1605 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1606 1607 if (EllipsisLoc.isValid()) { 1608 // This is a pack expansion. 1609 if (!BaseType->containsUnexpandedParameterPack()) { 1610 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1611 << SourceRange(BaseLoc, RParenLoc); 1612 1613 EllipsisLoc = SourceLocation(); 1614 } 1615 } else { 1616 // Check for any unexpanded parameter packs. 1617 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1618 return true; 1619 1620 for (unsigned I = 0; I != NumArgs; ++I) 1621 if (DiagnoseUnexpandedParameterPack(Args[I])) 1622 return true; 1623 } 1624 1625 // Check for direct and virtual base classes. 1626 const CXXBaseSpecifier *DirectBaseSpec = 0; 1627 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1628 if (!Dependent) { 1629 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1630 BaseType)) 1631 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1632 LParenLoc, RParenLoc, ClassDecl); 1633 1634 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1635 VirtualBaseSpec); 1636 1637 // C++ [base.class.init]p2: 1638 // Unless the mem-initializer-id names a nonstatic data member of the 1639 // constructor's class or a direct or virtual base of that class, the 1640 // mem-initializer is ill-formed. 1641 if (!DirectBaseSpec && !VirtualBaseSpec) { 1642 // If the class has any dependent bases, then it's possible that 1643 // one of those types will resolve to the same type as 1644 // BaseType. Therefore, just treat this as a dependent base 1645 // class initialization. FIXME: Should we try to check the 1646 // initialization anyway? It seems odd. 1647 if (ClassDecl->hasAnyDependentBases()) 1648 Dependent = true; 1649 else 1650 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1651 << BaseType << Context.getTypeDeclType(ClassDecl) 1652 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1653 } 1654 } 1655 1656 if (Dependent) { 1657 // Can't check initialization for a base of dependent type or when 1658 // any of the arguments are type-dependent expressions. 1659 ExprResult BaseInit 1660 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1661 RParenLoc)); 1662 1663 // Erase any temporaries within this evaluation context; we're not 1664 // going to track them in the AST, since we'll be rebuilding the 1665 // ASTs during template instantiation. 1666 ExprTemporaries.erase( 1667 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1668 ExprTemporaries.end()); 1669 1670 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1671 /*IsVirtual=*/false, 1672 LParenLoc, 1673 BaseInit.takeAs<Expr>(), 1674 RParenLoc, 1675 EllipsisLoc); 1676 } 1677 1678 // C++ [base.class.init]p2: 1679 // If a mem-initializer-id is ambiguous because it designates both 1680 // a direct non-virtual base class and an inherited virtual base 1681 // class, the mem-initializer is ill-formed. 1682 if (DirectBaseSpec && VirtualBaseSpec) 1683 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1684 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1685 1686 CXXBaseSpecifier *BaseSpec 1687 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1688 if (!BaseSpec) 1689 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1690 1691 // Initialize the base. 1692 InitializedEntity BaseEntity = 1693 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1694 InitializationKind Kind = 1695 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1696 1697 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1698 1699 ExprResult BaseInit = 1700 InitSeq.Perform(*this, BaseEntity, Kind, 1701 MultiExprArg(*this, Args, NumArgs), 0); 1702 if (BaseInit.isInvalid()) 1703 return true; 1704 1705 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1706 1707 // C++0x [class.base.init]p7: 1708 // The initialization of each base and member constitutes a 1709 // full-expression. 1710 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1711 if (BaseInit.isInvalid()) 1712 return true; 1713 1714 // If we are in a dependent context, template instantiation will 1715 // perform this type-checking again. Just save the arguments that we 1716 // received in a ParenListExpr. 1717 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1718 // of the information that we have about the base 1719 // initializer. However, deconstructing the ASTs is a dicey process, 1720 // and this approach is far more likely to get the corner cases right. 1721 if (CurContext->isDependentContext()) { 1722 ExprResult Init 1723 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1724 RParenLoc)); 1725 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1726 BaseSpec->isVirtual(), 1727 LParenLoc, 1728 Init.takeAs<Expr>(), 1729 RParenLoc, 1730 EllipsisLoc); 1731 } 1732 1733 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1734 BaseSpec->isVirtual(), 1735 LParenLoc, 1736 BaseInit.takeAs<Expr>(), 1737 RParenLoc, 1738 EllipsisLoc); 1739} 1740 1741/// ImplicitInitializerKind - How an implicit base or member initializer should 1742/// initialize its base or member. 1743enum ImplicitInitializerKind { 1744 IIK_Default, 1745 IIK_Copy, 1746 IIK_Move 1747}; 1748 1749static bool 1750BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1751 ImplicitInitializerKind ImplicitInitKind, 1752 CXXBaseSpecifier *BaseSpec, 1753 bool IsInheritedVirtualBase, 1754 CXXCtorInitializer *&CXXBaseInit) { 1755 InitializedEntity InitEntity 1756 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1757 IsInheritedVirtualBase); 1758 1759 ExprResult BaseInit; 1760 1761 switch (ImplicitInitKind) { 1762 case IIK_Default: { 1763 InitializationKind InitKind 1764 = InitializationKind::CreateDefault(Constructor->getLocation()); 1765 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1766 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1767 MultiExprArg(SemaRef, 0, 0)); 1768 break; 1769 } 1770 1771 case IIK_Copy: { 1772 ParmVarDecl *Param = Constructor->getParamDecl(0); 1773 QualType ParamType = Param->getType().getNonReferenceType(); 1774 1775 Expr *CopyCtorArg = 1776 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1777 Constructor->getLocation(), ParamType, 1778 VK_LValue, 0); 1779 1780 // Cast to the base class to avoid ambiguities. 1781 QualType ArgTy = 1782 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1783 ParamType.getQualifiers()); 1784 1785 CXXCastPath BasePath; 1786 BasePath.push_back(BaseSpec); 1787 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1788 CK_UncheckedDerivedToBase, 1789 VK_LValue, &BasePath).take(); 1790 1791 InitializationKind InitKind 1792 = InitializationKind::CreateDirect(Constructor->getLocation(), 1793 SourceLocation(), SourceLocation()); 1794 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1795 &CopyCtorArg, 1); 1796 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1797 MultiExprArg(&CopyCtorArg, 1)); 1798 break; 1799 } 1800 1801 case IIK_Move: 1802 assert(false && "Unhandled initializer kind!"); 1803 } 1804 1805 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1806 if (BaseInit.isInvalid()) 1807 return true; 1808 1809 CXXBaseInit = 1810 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1811 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1812 SourceLocation()), 1813 BaseSpec->isVirtual(), 1814 SourceLocation(), 1815 BaseInit.takeAs<Expr>(), 1816 SourceLocation(), 1817 SourceLocation()); 1818 1819 return false; 1820} 1821 1822static bool 1823BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1824 ImplicitInitializerKind ImplicitInitKind, 1825 FieldDecl *Field, 1826 CXXCtorInitializer *&CXXMemberInit) { 1827 if (Field->isInvalidDecl()) 1828 return true; 1829 1830 SourceLocation Loc = Constructor->getLocation(); 1831 1832 if (ImplicitInitKind == IIK_Copy) { 1833 ParmVarDecl *Param = Constructor->getParamDecl(0); 1834 QualType ParamType = Param->getType().getNonReferenceType(); 1835 1836 Expr *MemberExprBase = 1837 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1838 Loc, ParamType, VK_LValue, 0); 1839 1840 // Build a reference to this field within the parameter. 1841 CXXScopeSpec SS; 1842 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1843 Sema::LookupMemberName); 1844 MemberLookup.addDecl(Field, AS_public); 1845 MemberLookup.resolveKind(); 1846 ExprResult CopyCtorArg 1847 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1848 ParamType, Loc, 1849 /*IsArrow=*/false, 1850 SS, 1851 /*FirstQualifierInScope=*/0, 1852 MemberLookup, 1853 /*TemplateArgs=*/0); 1854 if (CopyCtorArg.isInvalid()) 1855 return true; 1856 1857 // When the field we are copying is an array, create index variables for 1858 // each dimension of the array. We use these index variables to subscript 1859 // the source array, and other clients (e.g., CodeGen) will perform the 1860 // necessary iteration with these index variables. 1861 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1862 QualType BaseType = Field->getType(); 1863 QualType SizeType = SemaRef.Context.getSizeType(); 1864 while (const ConstantArrayType *Array 1865 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1866 // Create the iteration variable for this array index. 1867 IdentifierInfo *IterationVarName = 0; 1868 { 1869 llvm::SmallString<8> Str; 1870 llvm::raw_svector_ostream OS(Str); 1871 OS << "__i" << IndexVariables.size(); 1872 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1873 } 1874 VarDecl *IterationVar 1875 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1876 IterationVarName, SizeType, 1877 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1878 SC_None, SC_None); 1879 IndexVariables.push_back(IterationVar); 1880 1881 // Create a reference to the iteration variable. 1882 ExprResult IterationVarRef 1883 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1884 assert(!IterationVarRef.isInvalid() && 1885 "Reference to invented variable cannot fail!"); 1886 1887 // Subscript the array with this iteration variable. 1888 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1889 Loc, 1890 IterationVarRef.take(), 1891 Loc); 1892 if (CopyCtorArg.isInvalid()) 1893 return true; 1894 1895 BaseType = Array->getElementType(); 1896 } 1897 1898 // Construct the entity that we will be initializing. For an array, this 1899 // will be first element in the array, which may require several levels 1900 // of array-subscript entities. 1901 llvm::SmallVector<InitializedEntity, 4> Entities; 1902 Entities.reserve(1 + IndexVariables.size()); 1903 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1904 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1905 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1906 0, 1907 Entities.back())); 1908 1909 // Direct-initialize to use the copy constructor. 1910 InitializationKind InitKind = 1911 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1912 1913 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1914 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1915 &CopyCtorArgE, 1); 1916 1917 ExprResult MemberInit 1918 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1919 MultiExprArg(&CopyCtorArgE, 1)); 1920 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1921 if (MemberInit.isInvalid()) 1922 return true; 1923 1924 CXXMemberInit 1925 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1926 MemberInit.takeAs<Expr>(), Loc, 1927 IndexVariables.data(), 1928 IndexVariables.size()); 1929 return false; 1930 } 1931 1932 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1933 1934 QualType FieldBaseElementType = 1935 SemaRef.Context.getBaseElementType(Field->getType()); 1936 1937 if (FieldBaseElementType->isRecordType()) { 1938 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1939 InitializationKind InitKind = 1940 InitializationKind::CreateDefault(Loc); 1941 1942 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1943 ExprResult MemberInit = 1944 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1945 1946 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1947 if (MemberInit.isInvalid()) 1948 return true; 1949 1950 CXXMemberInit = 1951 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1952 Field, Loc, Loc, 1953 MemberInit.get(), 1954 Loc); 1955 return false; 1956 } 1957 1958 if (FieldBaseElementType->isReferenceType()) { 1959 SemaRef.Diag(Constructor->getLocation(), 1960 diag::err_uninitialized_member_in_ctor) 1961 << (int)Constructor->isImplicit() 1962 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1963 << 0 << Field->getDeclName(); 1964 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1965 return true; 1966 } 1967 1968 if (FieldBaseElementType.isConstQualified()) { 1969 SemaRef.Diag(Constructor->getLocation(), 1970 diag::err_uninitialized_member_in_ctor) 1971 << (int)Constructor->isImplicit() 1972 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1973 << 1 << Field->getDeclName(); 1974 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1975 return true; 1976 } 1977 1978 // Nothing to initialize. 1979 CXXMemberInit = 0; 1980 return false; 1981} 1982 1983namespace { 1984struct BaseAndFieldInfo { 1985 Sema &S; 1986 CXXConstructorDecl *Ctor; 1987 bool AnyErrorsInInits; 1988 ImplicitInitializerKind IIK; 1989 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1990 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1991 1992 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1993 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1994 // FIXME: Handle implicit move constructors. 1995 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1996 IIK = IIK_Copy; 1997 else 1998 IIK = IIK_Default; 1999 } 2000}; 2001} 2002 2003static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2004 FieldDecl *Top, FieldDecl *Field) { 2005 2006 // Overwhelmingly common case: we have a direct initializer for this field. 2007 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2008 Info.AllToInit.push_back(Init); 2009 return false; 2010 } 2011 2012 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2013 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2014 assert(FieldClassType && "anonymous struct/union without record type"); 2015 CXXRecordDecl *FieldClassDecl 2016 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2017 2018 // Even though union members never have non-trivial default 2019 // constructions in C++03, we still build member initializers for aggregate 2020 // record types which can be union members, and C++0x allows non-trivial 2021 // default constructors for union members, so we ensure that only one 2022 // member is initialized for these. 2023 if (FieldClassDecl->isUnion()) { 2024 // First check for an explicit initializer for one field. 2025 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2026 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2027 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2028 Info.AllToInit.push_back(Init); 2029 2030 // Once we've initialized a field of an anonymous union, the union 2031 // field in the class is also initialized, so exit immediately. 2032 return false; 2033 } else if ((*FA)->isAnonymousStructOrUnion()) { 2034 if (CollectFieldInitializer(Info, Top, *FA)) 2035 return true; 2036 } 2037 } 2038 2039 // Fallthrough and construct a default initializer for the union as 2040 // a whole, which can call its default constructor if such a thing exists 2041 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2042 // behavior going forward with C++0x, when anonymous unions there are 2043 // finalized, we should revisit this. 2044 } else { 2045 // For structs, we simply descend through to initialize all members where 2046 // necessary. 2047 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2048 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2049 if (CollectFieldInitializer(Info, Top, *FA)) 2050 return true; 2051 } 2052 } 2053 } 2054 2055 // Don't try to build an implicit initializer if there were semantic 2056 // errors in any of the initializers (and therefore we might be 2057 // missing some that the user actually wrote). 2058 if (Info.AnyErrorsInInits) 2059 return false; 2060 2061 CXXCtorInitializer *Init = 0; 2062 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2063 return true; 2064 2065 if (Init) 2066 Info.AllToInit.push_back(Init); 2067 2068 return false; 2069} 2070 2071bool 2072Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2073 CXXCtorInitializer **Initializers, 2074 unsigned NumInitializers, 2075 bool AnyErrors) { 2076 if (Constructor->getDeclContext()->isDependentContext()) { 2077 // Just store the initializers as written, they will be checked during 2078 // instantiation. 2079 if (NumInitializers > 0) { 2080 Constructor->setNumCtorInitializers(NumInitializers); 2081 CXXCtorInitializer **baseOrMemberInitializers = 2082 new (Context) CXXCtorInitializer*[NumInitializers]; 2083 memcpy(baseOrMemberInitializers, Initializers, 2084 NumInitializers * sizeof(CXXCtorInitializer*)); 2085 Constructor->setCtorInitializers(baseOrMemberInitializers); 2086 } 2087 2088 return false; 2089 } 2090 2091 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2092 2093 // We need to build the initializer AST according to order of construction 2094 // and not what user specified in the Initializers list. 2095 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2096 if (!ClassDecl) 2097 return true; 2098 2099 bool HadError = false; 2100 2101 for (unsigned i = 0; i < NumInitializers; i++) { 2102 CXXCtorInitializer *Member = Initializers[i]; 2103 2104 if (Member->isBaseInitializer()) 2105 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2106 else 2107 Info.AllBaseFields[Member->getAnyMember()] = Member; 2108 } 2109 2110 // Keep track of the direct virtual bases. 2111 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2112 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2113 E = ClassDecl->bases_end(); I != E; ++I) { 2114 if (I->isVirtual()) 2115 DirectVBases.insert(I); 2116 } 2117 2118 // Push virtual bases before others. 2119 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2120 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2121 2122 if (CXXCtorInitializer *Value 2123 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2124 Info.AllToInit.push_back(Value); 2125 } else if (!AnyErrors) { 2126 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2127 CXXCtorInitializer *CXXBaseInit; 2128 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2129 VBase, IsInheritedVirtualBase, 2130 CXXBaseInit)) { 2131 HadError = true; 2132 continue; 2133 } 2134 2135 Info.AllToInit.push_back(CXXBaseInit); 2136 } 2137 } 2138 2139 // Non-virtual bases. 2140 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2141 E = ClassDecl->bases_end(); Base != E; ++Base) { 2142 // Virtuals are in the virtual base list and already constructed. 2143 if (Base->isVirtual()) 2144 continue; 2145 2146 if (CXXCtorInitializer *Value 2147 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2148 Info.AllToInit.push_back(Value); 2149 } else if (!AnyErrors) { 2150 CXXCtorInitializer *CXXBaseInit; 2151 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2152 Base, /*IsInheritedVirtualBase=*/false, 2153 CXXBaseInit)) { 2154 HadError = true; 2155 continue; 2156 } 2157 2158 Info.AllToInit.push_back(CXXBaseInit); 2159 } 2160 } 2161 2162 // Fields. 2163 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2164 E = ClassDecl->field_end(); Field != E; ++Field) { 2165 if ((*Field)->getType()->isIncompleteArrayType()) { 2166 assert(ClassDecl->hasFlexibleArrayMember() && 2167 "Incomplete array type is not valid"); 2168 continue; 2169 } 2170 if (CollectFieldInitializer(Info, *Field, *Field)) 2171 HadError = true; 2172 } 2173 2174 NumInitializers = Info.AllToInit.size(); 2175 if (NumInitializers > 0) { 2176 Constructor->setNumCtorInitializers(NumInitializers); 2177 CXXCtorInitializer **baseOrMemberInitializers = 2178 new (Context) CXXCtorInitializer*[NumInitializers]; 2179 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2180 NumInitializers * sizeof(CXXCtorInitializer*)); 2181 Constructor->setCtorInitializers(baseOrMemberInitializers); 2182 2183 // Constructors implicitly reference the base and member 2184 // destructors. 2185 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2186 Constructor->getParent()); 2187 } 2188 2189 return HadError; 2190} 2191 2192static void *GetKeyForTopLevelField(FieldDecl *Field) { 2193 // For anonymous unions, use the class declaration as the key. 2194 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2195 if (RT->getDecl()->isAnonymousStructOrUnion()) 2196 return static_cast<void *>(RT->getDecl()); 2197 } 2198 return static_cast<void *>(Field); 2199} 2200 2201static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2202 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2203} 2204 2205static void *GetKeyForMember(ASTContext &Context, 2206 CXXCtorInitializer *Member) { 2207 if (!Member->isAnyMemberInitializer()) 2208 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2209 2210 // For fields injected into the class via declaration of an anonymous union, 2211 // use its anonymous union class declaration as the unique key. 2212 FieldDecl *Field = Member->getAnyMember(); 2213 2214 // If the field is a member of an anonymous struct or union, our key 2215 // is the anonymous record decl that's a direct child of the class. 2216 RecordDecl *RD = Field->getParent(); 2217 if (RD->isAnonymousStructOrUnion()) { 2218 while (true) { 2219 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2220 if (Parent->isAnonymousStructOrUnion()) 2221 RD = Parent; 2222 else 2223 break; 2224 } 2225 2226 return static_cast<void *>(RD); 2227 } 2228 2229 return static_cast<void *>(Field); 2230} 2231 2232static void 2233DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2234 const CXXConstructorDecl *Constructor, 2235 CXXCtorInitializer **Inits, 2236 unsigned NumInits) { 2237 if (Constructor->getDeclContext()->isDependentContext()) 2238 return; 2239 2240 // Don't check initializers order unless the warning is enabled at the 2241 // location of at least one initializer. 2242 bool ShouldCheckOrder = false; 2243 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2244 CXXCtorInitializer *Init = Inits[InitIndex]; 2245 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2246 Init->getSourceLocation()) 2247 != Diagnostic::Ignored) { 2248 ShouldCheckOrder = true; 2249 break; 2250 } 2251 } 2252 if (!ShouldCheckOrder) 2253 return; 2254 2255 // Build the list of bases and members in the order that they'll 2256 // actually be initialized. The explicit initializers should be in 2257 // this same order but may be missing things. 2258 llvm::SmallVector<const void*, 32> IdealInitKeys; 2259 2260 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2261 2262 // 1. Virtual bases. 2263 for (CXXRecordDecl::base_class_const_iterator VBase = 2264 ClassDecl->vbases_begin(), 2265 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2266 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2267 2268 // 2. Non-virtual bases. 2269 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2270 E = ClassDecl->bases_end(); Base != E; ++Base) { 2271 if (Base->isVirtual()) 2272 continue; 2273 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2274 } 2275 2276 // 3. Direct fields. 2277 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2278 E = ClassDecl->field_end(); Field != E; ++Field) 2279 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2280 2281 unsigned NumIdealInits = IdealInitKeys.size(); 2282 unsigned IdealIndex = 0; 2283 2284 CXXCtorInitializer *PrevInit = 0; 2285 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2286 CXXCtorInitializer *Init = Inits[InitIndex]; 2287 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2288 2289 // Scan forward to try to find this initializer in the idealized 2290 // initializers list. 2291 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2292 if (InitKey == IdealInitKeys[IdealIndex]) 2293 break; 2294 2295 // If we didn't find this initializer, it must be because we 2296 // scanned past it on a previous iteration. That can only 2297 // happen if we're out of order; emit a warning. 2298 if (IdealIndex == NumIdealInits && PrevInit) { 2299 Sema::SemaDiagnosticBuilder D = 2300 SemaRef.Diag(PrevInit->getSourceLocation(), 2301 diag::warn_initializer_out_of_order); 2302 2303 if (PrevInit->isAnyMemberInitializer()) 2304 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2305 else 2306 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2307 2308 if (Init->isAnyMemberInitializer()) 2309 D << 0 << Init->getAnyMember()->getDeclName(); 2310 else 2311 D << 1 << Init->getBaseClassInfo()->getType(); 2312 2313 // Move back to the initializer's location in the ideal list. 2314 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2315 if (InitKey == IdealInitKeys[IdealIndex]) 2316 break; 2317 2318 assert(IdealIndex != NumIdealInits && 2319 "initializer not found in initializer list"); 2320 } 2321 2322 PrevInit = Init; 2323 } 2324} 2325 2326namespace { 2327bool CheckRedundantInit(Sema &S, 2328 CXXCtorInitializer *Init, 2329 CXXCtorInitializer *&PrevInit) { 2330 if (!PrevInit) { 2331 PrevInit = Init; 2332 return false; 2333 } 2334 2335 if (FieldDecl *Field = Init->getMember()) 2336 S.Diag(Init->getSourceLocation(), 2337 diag::err_multiple_mem_initialization) 2338 << Field->getDeclName() 2339 << Init->getSourceRange(); 2340 else { 2341 const Type *BaseClass = Init->getBaseClass(); 2342 assert(BaseClass && "neither field nor base"); 2343 S.Diag(Init->getSourceLocation(), 2344 diag::err_multiple_base_initialization) 2345 << QualType(BaseClass, 0) 2346 << Init->getSourceRange(); 2347 } 2348 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2349 << 0 << PrevInit->getSourceRange(); 2350 2351 return true; 2352} 2353 2354typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2355typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2356 2357bool CheckRedundantUnionInit(Sema &S, 2358 CXXCtorInitializer *Init, 2359 RedundantUnionMap &Unions) { 2360 FieldDecl *Field = Init->getAnyMember(); 2361 RecordDecl *Parent = Field->getParent(); 2362 if (!Parent->isAnonymousStructOrUnion()) 2363 return false; 2364 2365 NamedDecl *Child = Field; 2366 do { 2367 if (Parent->isUnion()) { 2368 UnionEntry &En = Unions[Parent]; 2369 if (En.first && En.first != Child) { 2370 S.Diag(Init->getSourceLocation(), 2371 diag::err_multiple_mem_union_initialization) 2372 << Field->getDeclName() 2373 << Init->getSourceRange(); 2374 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2375 << 0 << En.second->getSourceRange(); 2376 return true; 2377 } else if (!En.first) { 2378 En.first = Child; 2379 En.second = Init; 2380 } 2381 } 2382 2383 Child = Parent; 2384 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2385 } while (Parent->isAnonymousStructOrUnion()); 2386 2387 return false; 2388} 2389} 2390 2391/// ActOnMemInitializers - Handle the member initializers for a constructor. 2392void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2393 SourceLocation ColonLoc, 2394 MemInitTy **meminits, unsigned NumMemInits, 2395 bool AnyErrors) { 2396 if (!ConstructorDecl) 2397 return; 2398 2399 AdjustDeclIfTemplate(ConstructorDecl); 2400 2401 CXXConstructorDecl *Constructor 2402 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2403 2404 if (!Constructor) { 2405 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2406 return; 2407 } 2408 2409 CXXCtorInitializer **MemInits = 2410 reinterpret_cast<CXXCtorInitializer **>(meminits); 2411 2412 // Mapping for the duplicate initializers check. 2413 // For member initializers, this is keyed with a FieldDecl*. 2414 // For base initializers, this is keyed with a Type*. 2415 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2416 2417 // Mapping for the inconsistent anonymous-union initializers check. 2418 RedundantUnionMap MemberUnions; 2419 2420 bool HadError = false; 2421 for (unsigned i = 0; i < NumMemInits; i++) { 2422 CXXCtorInitializer *Init = MemInits[i]; 2423 2424 // Set the source order index. 2425 Init->setSourceOrder(i); 2426 2427 if (Init->isAnyMemberInitializer()) { 2428 FieldDecl *Field = Init->getAnyMember(); 2429 if (CheckRedundantInit(*this, Init, Members[Field]) || 2430 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2431 HadError = true; 2432 } else if (Init->isBaseInitializer()) { 2433 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2434 if (CheckRedundantInit(*this, Init, Members[Key])) 2435 HadError = true; 2436 } else { 2437 assert(Init->isDelegatingInitializer()); 2438 // This must be the only initializer 2439 if (i != 0 || NumMemInits > 1) { 2440 Diag(MemInits[0]->getSourceLocation(), 2441 diag::err_delegating_initializer_alone) 2442 << MemInits[0]->getSourceRange(); 2443 HadError = true; 2444 } 2445 } 2446 } 2447 2448 if (HadError) 2449 return; 2450 2451 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2452 2453 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2454} 2455 2456void 2457Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2458 CXXRecordDecl *ClassDecl) { 2459 // Ignore dependent contexts. 2460 if (ClassDecl->isDependentContext()) 2461 return; 2462 2463 // FIXME: all the access-control diagnostics are positioned on the 2464 // field/base declaration. That's probably good; that said, the 2465 // user might reasonably want to know why the destructor is being 2466 // emitted, and we currently don't say. 2467 2468 // Non-static data members. 2469 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2470 E = ClassDecl->field_end(); I != E; ++I) { 2471 FieldDecl *Field = *I; 2472 if (Field->isInvalidDecl()) 2473 continue; 2474 QualType FieldType = Context.getBaseElementType(Field->getType()); 2475 2476 const RecordType* RT = FieldType->getAs<RecordType>(); 2477 if (!RT) 2478 continue; 2479 2480 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2481 if (FieldClassDecl->isInvalidDecl()) 2482 continue; 2483 if (FieldClassDecl->hasTrivialDestructor()) 2484 continue; 2485 2486 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2487 assert(Dtor && "No dtor found for FieldClassDecl!"); 2488 CheckDestructorAccess(Field->getLocation(), Dtor, 2489 PDiag(diag::err_access_dtor_field) 2490 << Field->getDeclName() 2491 << FieldType); 2492 2493 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2494 } 2495 2496 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2497 2498 // Bases. 2499 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2500 E = ClassDecl->bases_end(); Base != E; ++Base) { 2501 // Bases are always records in a well-formed non-dependent class. 2502 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2503 2504 // Remember direct virtual bases. 2505 if (Base->isVirtual()) 2506 DirectVirtualBases.insert(RT); 2507 2508 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2509 // If our base class is invalid, we probably can't get its dtor anyway. 2510 if (BaseClassDecl->isInvalidDecl()) 2511 continue; 2512 // Ignore trivial destructors. 2513 if (BaseClassDecl->hasTrivialDestructor()) 2514 continue; 2515 2516 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2517 assert(Dtor && "No dtor found for BaseClassDecl!"); 2518 2519 // FIXME: caret should be on the start of the class name 2520 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2521 PDiag(diag::err_access_dtor_base) 2522 << Base->getType() 2523 << Base->getSourceRange()); 2524 2525 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2526 } 2527 2528 // Virtual bases. 2529 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2530 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2531 2532 // Bases are always records in a well-formed non-dependent class. 2533 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2534 2535 // Ignore direct virtual bases. 2536 if (DirectVirtualBases.count(RT)) 2537 continue; 2538 2539 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2540 // If our base class is invalid, we probably can't get its dtor anyway. 2541 if (BaseClassDecl->isInvalidDecl()) 2542 continue; 2543 // Ignore trivial destructors. 2544 if (BaseClassDecl->hasTrivialDestructor()) 2545 continue; 2546 2547 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2548 assert(Dtor && "No dtor found for BaseClassDecl!"); 2549 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2550 PDiag(diag::err_access_dtor_vbase) 2551 << VBase->getType()); 2552 2553 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2554 } 2555} 2556 2557void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2558 if (!CDtorDecl) 2559 return; 2560 2561 if (CXXConstructorDecl *Constructor 2562 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2563 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2564} 2565 2566bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2567 unsigned DiagID, AbstractDiagSelID SelID) { 2568 if (SelID == -1) 2569 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2570 else 2571 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2572} 2573 2574bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2575 const PartialDiagnostic &PD) { 2576 if (!getLangOptions().CPlusPlus) 2577 return false; 2578 2579 if (const ArrayType *AT = Context.getAsArrayType(T)) 2580 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2581 2582 if (const PointerType *PT = T->getAs<PointerType>()) { 2583 // Find the innermost pointer type. 2584 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2585 PT = T; 2586 2587 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2588 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2589 } 2590 2591 const RecordType *RT = T->getAs<RecordType>(); 2592 if (!RT) 2593 return false; 2594 2595 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2596 2597 // We can't answer whether something is abstract until it has a 2598 // definition. If it's currently being defined, we'll walk back 2599 // over all the declarations when we have a full definition. 2600 const CXXRecordDecl *Def = RD->getDefinition(); 2601 if (!Def || Def->isBeingDefined()) 2602 return false; 2603 2604 if (!RD->isAbstract()) 2605 return false; 2606 2607 Diag(Loc, PD) << RD->getDeclName(); 2608 DiagnoseAbstractType(RD); 2609 2610 return true; 2611} 2612 2613void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2614 // Check if we've already emitted the list of pure virtual functions 2615 // for this class. 2616 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2617 return; 2618 2619 CXXFinalOverriderMap FinalOverriders; 2620 RD->getFinalOverriders(FinalOverriders); 2621 2622 // Keep a set of seen pure methods so we won't diagnose the same method 2623 // more than once. 2624 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2625 2626 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2627 MEnd = FinalOverriders.end(); 2628 M != MEnd; 2629 ++M) { 2630 for (OverridingMethods::iterator SO = M->second.begin(), 2631 SOEnd = M->second.end(); 2632 SO != SOEnd; ++SO) { 2633 // C++ [class.abstract]p4: 2634 // A class is abstract if it contains or inherits at least one 2635 // pure virtual function for which the final overrider is pure 2636 // virtual. 2637 2638 // 2639 if (SO->second.size() != 1) 2640 continue; 2641 2642 if (!SO->second.front().Method->isPure()) 2643 continue; 2644 2645 if (!SeenPureMethods.insert(SO->second.front().Method)) 2646 continue; 2647 2648 Diag(SO->second.front().Method->getLocation(), 2649 diag::note_pure_virtual_function) 2650 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2651 } 2652 } 2653 2654 if (!PureVirtualClassDiagSet) 2655 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2656 PureVirtualClassDiagSet->insert(RD); 2657} 2658 2659namespace { 2660struct AbstractUsageInfo { 2661 Sema &S; 2662 CXXRecordDecl *Record; 2663 CanQualType AbstractType; 2664 bool Invalid; 2665 2666 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2667 : S(S), Record(Record), 2668 AbstractType(S.Context.getCanonicalType( 2669 S.Context.getTypeDeclType(Record))), 2670 Invalid(false) {} 2671 2672 void DiagnoseAbstractType() { 2673 if (Invalid) return; 2674 S.DiagnoseAbstractType(Record); 2675 Invalid = true; 2676 } 2677 2678 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2679}; 2680 2681struct CheckAbstractUsage { 2682 AbstractUsageInfo &Info; 2683 const NamedDecl *Ctx; 2684 2685 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2686 : Info(Info), Ctx(Ctx) {} 2687 2688 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2689 switch (TL.getTypeLocClass()) { 2690#define ABSTRACT_TYPELOC(CLASS, PARENT) 2691#define TYPELOC(CLASS, PARENT) \ 2692 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2693#include "clang/AST/TypeLocNodes.def" 2694 } 2695 } 2696 2697 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2698 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2699 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2700 if (!TL.getArg(I)) 2701 continue; 2702 2703 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2704 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2705 } 2706 } 2707 2708 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2709 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2710 } 2711 2712 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2713 // Visit the type parameters from a permissive context. 2714 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2715 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2716 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2717 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2718 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2719 // TODO: other template argument types? 2720 } 2721 } 2722 2723 // Visit pointee types from a permissive context. 2724#define CheckPolymorphic(Type) \ 2725 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2726 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2727 } 2728 CheckPolymorphic(PointerTypeLoc) 2729 CheckPolymorphic(ReferenceTypeLoc) 2730 CheckPolymorphic(MemberPointerTypeLoc) 2731 CheckPolymorphic(BlockPointerTypeLoc) 2732 2733 /// Handle all the types we haven't given a more specific 2734 /// implementation for above. 2735 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2736 // Every other kind of type that we haven't called out already 2737 // that has an inner type is either (1) sugar or (2) contains that 2738 // inner type in some way as a subobject. 2739 if (TypeLoc Next = TL.getNextTypeLoc()) 2740 return Visit(Next, Sel); 2741 2742 // If there's no inner type and we're in a permissive context, 2743 // don't diagnose. 2744 if (Sel == Sema::AbstractNone) return; 2745 2746 // Check whether the type matches the abstract type. 2747 QualType T = TL.getType(); 2748 if (T->isArrayType()) { 2749 Sel = Sema::AbstractArrayType; 2750 T = Info.S.Context.getBaseElementType(T); 2751 } 2752 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2753 if (CT != Info.AbstractType) return; 2754 2755 // It matched; do some magic. 2756 if (Sel == Sema::AbstractArrayType) { 2757 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2758 << T << TL.getSourceRange(); 2759 } else { 2760 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2761 << Sel << T << TL.getSourceRange(); 2762 } 2763 Info.DiagnoseAbstractType(); 2764 } 2765}; 2766 2767void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2768 Sema::AbstractDiagSelID Sel) { 2769 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2770} 2771 2772} 2773 2774/// Check for invalid uses of an abstract type in a method declaration. 2775static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2776 CXXMethodDecl *MD) { 2777 // No need to do the check on definitions, which require that 2778 // the return/param types be complete. 2779 if (MD->isThisDeclarationADefinition()) 2780 return; 2781 2782 // For safety's sake, just ignore it if we don't have type source 2783 // information. This should never happen for non-implicit methods, 2784 // but... 2785 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2786 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2787} 2788 2789/// Check for invalid uses of an abstract type within a class definition. 2790static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2791 CXXRecordDecl *RD) { 2792 for (CXXRecordDecl::decl_iterator 2793 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2794 Decl *D = *I; 2795 if (D->isImplicit()) continue; 2796 2797 // Methods and method templates. 2798 if (isa<CXXMethodDecl>(D)) { 2799 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2800 } else if (isa<FunctionTemplateDecl>(D)) { 2801 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2802 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2803 2804 // Fields and static variables. 2805 } else if (isa<FieldDecl>(D)) { 2806 FieldDecl *FD = cast<FieldDecl>(D); 2807 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2808 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2809 } else if (isa<VarDecl>(D)) { 2810 VarDecl *VD = cast<VarDecl>(D); 2811 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2812 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2813 2814 // Nested classes and class templates. 2815 } else if (isa<CXXRecordDecl>(D)) { 2816 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2817 } else if (isa<ClassTemplateDecl>(D)) { 2818 CheckAbstractClassUsage(Info, 2819 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2820 } 2821 } 2822} 2823 2824/// \brief Perform semantic checks on a class definition that has been 2825/// completing, introducing implicitly-declared members, checking for 2826/// abstract types, etc. 2827void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2828 if (!Record) 2829 return; 2830 2831 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2832 AbstractUsageInfo Info(*this, Record); 2833 CheckAbstractClassUsage(Info, Record); 2834 } 2835 2836 // If this is not an aggregate type and has no user-declared constructor, 2837 // complain about any non-static data members of reference or const scalar 2838 // type, since they will never get initializers. 2839 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2840 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2841 bool Complained = false; 2842 for (RecordDecl::field_iterator F = Record->field_begin(), 2843 FEnd = Record->field_end(); 2844 F != FEnd; ++F) { 2845 if (F->getType()->isReferenceType() || 2846 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2847 if (!Complained) { 2848 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2849 << Record->getTagKind() << Record; 2850 Complained = true; 2851 } 2852 2853 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2854 << F->getType()->isReferenceType() 2855 << F->getDeclName(); 2856 } 2857 } 2858 } 2859 2860 if (Record->isDynamicClass() && !Record->isDependentType()) 2861 DynamicClasses.push_back(Record); 2862 2863 if (Record->getIdentifier()) { 2864 // C++ [class.mem]p13: 2865 // If T is the name of a class, then each of the following shall have a 2866 // name different from T: 2867 // - every member of every anonymous union that is a member of class T. 2868 // 2869 // C++ [class.mem]p14: 2870 // In addition, if class T has a user-declared constructor (12.1), every 2871 // non-static data member of class T shall have a name different from T. 2872 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2873 R.first != R.second; ++R.first) { 2874 NamedDecl *D = *R.first; 2875 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2876 isa<IndirectFieldDecl>(D)) { 2877 Diag(D->getLocation(), diag::err_member_name_of_class) 2878 << D->getDeclName(); 2879 break; 2880 } 2881 } 2882 } 2883 2884 // Warn if the class has virtual methods but non-virtual public destructor. 2885 if (Record->isPolymorphic() && !Record->isDependentType()) { 2886 CXXDestructorDecl *dtor = Record->getDestructor(); 2887 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2888 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2889 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2890 } 2891 2892 // See if a method overloads virtual methods in a base 2893 /// class without overriding any. 2894 if (!Record->isDependentType()) { 2895 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2896 MEnd = Record->method_end(); 2897 M != MEnd; ++M) { 2898 if (!(*M)->isStatic()) 2899 DiagnoseHiddenVirtualMethods(Record, *M); 2900 } 2901 } 2902 2903 // Declare inherited constructors. We do this eagerly here because: 2904 // - The standard requires an eager diagnostic for conflicting inherited 2905 // constructors from different classes. 2906 // - The lazy declaration of the other implicit constructors is so as to not 2907 // waste space and performance on classes that are not meant to be 2908 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2909 // have inherited constructors. 2910 DeclareInheritedConstructors(Record); 2911} 2912 2913/// \brief Data used with FindHiddenVirtualMethod 2914namespace { 2915 struct FindHiddenVirtualMethodData { 2916 Sema *S; 2917 CXXMethodDecl *Method; 2918 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2919 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2920 }; 2921} 2922 2923/// \brief Member lookup function that determines whether a given C++ 2924/// method overloads virtual methods in a base class without overriding any, 2925/// to be used with CXXRecordDecl::lookupInBases(). 2926static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2927 CXXBasePath &Path, 2928 void *UserData) { 2929 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2930 2931 FindHiddenVirtualMethodData &Data 2932 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2933 2934 DeclarationName Name = Data.Method->getDeclName(); 2935 assert(Name.getNameKind() == DeclarationName::Identifier); 2936 2937 bool foundSameNameMethod = false; 2938 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2939 for (Path.Decls = BaseRecord->lookup(Name); 2940 Path.Decls.first != Path.Decls.second; 2941 ++Path.Decls.first) { 2942 NamedDecl *D = *Path.Decls.first; 2943 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2944 MD = MD->getCanonicalDecl(); 2945 foundSameNameMethod = true; 2946 // Interested only in hidden virtual methods. 2947 if (!MD->isVirtual()) 2948 continue; 2949 // If the method we are checking overrides a method from its base 2950 // don't warn about the other overloaded methods. 2951 if (!Data.S->IsOverload(Data.Method, MD, false)) 2952 return true; 2953 // Collect the overload only if its hidden. 2954 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2955 overloadedMethods.push_back(MD); 2956 } 2957 } 2958 2959 if (foundSameNameMethod) 2960 Data.OverloadedMethods.append(overloadedMethods.begin(), 2961 overloadedMethods.end()); 2962 return foundSameNameMethod; 2963} 2964 2965/// \brief See if a method overloads virtual methods in a base class without 2966/// overriding any. 2967void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2968 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2969 MD->getLocation()) == Diagnostic::Ignored) 2970 return; 2971 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2972 return; 2973 2974 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 2975 /*bool RecordPaths=*/false, 2976 /*bool DetectVirtual=*/false); 2977 FindHiddenVirtualMethodData Data; 2978 Data.Method = MD; 2979 Data.S = this; 2980 2981 // Keep the base methods that were overriden or introduced in the subclass 2982 // by 'using' in a set. A base method not in this set is hidden. 2983 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 2984 res.first != res.second; ++res.first) { 2985 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 2986 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 2987 E = MD->end_overridden_methods(); 2988 I != E; ++I) 2989 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 2990 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 2991 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 2992 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 2993 } 2994 2995 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 2996 !Data.OverloadedMethods.empty()) { 2997 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 2998 << MD << (Data.OverloadedMethods.size() > 1); 2999 3000 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3001 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3002 Diag(overloadedMD->getLocation(), 3003 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3004 } 3005 } 3006} 3007 3008void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3009 Decl *TagDecl, 3010 SourceLocation LBrac, 3011 SourceLocation RBrac, 3012 AttributeList *AttrList) { 3013 if (!TagDecl) 3014 return; 3015 3016 AdjustDeclIfTemplate(TagDecl); 3017 3018 ActOnFields(S, RLoc, TagDecl, 3019 // strict aliasing violation! 3020 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3021 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3022 3023 CheckCompletedCXXClass( 3024 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3025} 3026 3027namespace { 3028 /// \brief Helper class that collects exception specifications for 3029 /// implicitly-declared special member functions. 3030 class ImplicitExceptionSpecification { 3031 ASTContext &Context; 3032 // We order exception specifications thus: 3033 // noexcept is the most restrictive, but is only used in C++0x. 3034 // throw() comes next. 3035 // Then a throw(collected exceptions) 3036 // Finally no specification. 3037 // throw(...) is used instead if any called function uses it. 3038 ExceptionSpecificationType ComputedEST; 3039 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3040 llvm::SmallVector<QualType, 4> Exceptions; 3041 3042 void ClearExceptions() { 3043 ExceptionsSeen.clear(); 3044 Exceptions.clear(); 3045 } 3046 3047 public: 3048 explicit ImplicitExceptionSpecification(ASTContext &Context) 3049 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3050 if (!Context.getLangOptions().CPlusPlus0x) 3051 ComputedEST = EST_DynamicNone; 3052 } 3053 3054 /// \brief Get the computed exception specification type. 3055 ExceptionSpecificationType getExceptionSpecType() const { 3056 assert(ComputedEST != EST_ComputedNoexcept && 3057 "noexcept(expr) should not be a possible result"); 3058 return ComputedEST; 3059 } 3060 3061 /// \brief The number of exceptions in the exception specification. 3062 unsigned size() const { return Exceptions.size(); } 3063 3064 /// \brief The set of exceptions in the exception specification. 3065 const QualType *data() const { return Exceptions.data(); } 3066 3067 /// \brief Integrate another called method into the collected data. 3068 void CalledDecl(CXXMethodDecl *Method) { 3069 // If we have an MSAny spec already, don't bother. 3070 if (!Method || ComputedEST == EST_MSAny) 3071 return; 3072 3073 const FunctionProtoType *Proto 3074 = Method->getType()->getAs<FunctionProtoType>(); 3075 3076 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3077 3078 // If this function can throw any exceptions, make a note of that. 3079 if (EST == EST_MSAny || EST == EST_None) { 3080 ClearExceptions(); 3081 ComputedEST = EST; 3082 return; 3083 } 3084 3085 // If this function has a basic noexcept, it doesn't affect the outcome. 3086 if (EST == EST_BasicNoexcept) 3087 return; 3088 3089 // If we have a throw-all spec at this point, ignore the function. 3090 if (ComputedEST == EST_None) 3091 return; 3092 3093 // If we're still at noexcept(true) and there's a nothrow() callee, 3094 // change to that specification. 3095 if (EST == EST_DynamicNone) { 3096 if (ComputedEST == EST_BasicNoexcept) 3097 ComputedEST = EST_DynamicNone; 3098 return; 3099 } 3100 3101 // Check out noexcept specs. 3102 if (EST == EST_ComputedNoexcept) { 3103 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3104 assert(NR != FunctionProtoType::NR_NoNoexcept && 3105 "Must have noexcept result for EST_ComputedNoexcept."); 3106 assert(NR != FunctionProtoType::NR_Dependent && 3107 "Should not generate implicit declarations for dependent cases, " 3108 "and don't know how to handle them anyway."); 3109 3110 // noexcept(false) -> no spec on the new function 3111 if (NR == FunctionProtoType::NR_Throw) { 3112 ClearExceptions(); 3113 ComputedEST = EST_None; 3114 } 3115 // noexcept(true) won't change anything either. 3116 return; 3117 } 3118 3119 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3120 assert(ComputedEST != EST_None && 3121 "Shouldn't collect exceptions when throw-all is guaranteed."); 3122 ComputedEST = EST_Dynamic; 3123 // Record the exceptions in this function's exception specification. 3124 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3125 EEnd = Proto->exception_end(); 3126 E != EEnd; ++E) 3127 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3128 Exceptions.push_back(*E); 3129 } 3130 }; 3131} 3132 3133 3134/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3135/// special functions, such as the default constructor, copy 3136/// constructor, or destructor, to the given C++ class (C++ 3137/// [special]p1). This routine can only be executed just before the 3138/// definition of the class is complete. 3139void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3140 if (!ClassDecl->hasUserDeclaredConstructor()) 3141 ++ASTContext::NumImplicitDefaultConstructors; 3142 3143 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3144 ++ASTContext::NumImplicitCopyConstructors; 3145 3146 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3147 ++ASTContext::NumImplicitCopyAssignmentOperators; 3148 3149 // If we have a dynamic class, then the copy assignment operator may be 3150 // virtual, so we have to declare it immediately. This ensures that, e.g., 3151 // it shows up in the right place in the vtable and that we diagnose 3152 // problems with the implicit exception specification. 3153 if (ClassDecl->isDynamicClass()) 3154 DeclareImplicitCopyAssignment(ClassDecl); 3155 } 3156 3157 if (!ClassDecl->hasUserDeclaredDestructor()) { 3158 ++ASTContext::NumImplicitDestructors; 3159 3160 // If we have a dynamic class, then the destructor may be virtual, so we 3161 // have to declare the destructor immediately. This ensures that, e.g., it 3162 // shows up in the right place in the vtable and that we diagnose problems 3163 // with the implicit exception specification. 3164 if (ClassDecl->isDynamicClass()) 3165 DeclareImplicitDestructor(ClassDecl); 3166 } 3167} 3168 3169void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3170 if (!D) 3171 return; 3172 3173 int NumParamList = D->getNumTemplateParameterLists(); 3174 for (int i = 0; i < NumParamList; i++) { 3175 TemplateParameterList* Params = D->getTemplateParameterList(i); 3176 for (TemplateParameterList::iterator Param = Params->begin(), 3177 ParamEnd = Params->end(); 3178 Param != ParamEnd; ++Param) { 3179 NamedDecl *Named = cast<NamedDecl>(*Param); 3180 if (Named->getDeclName()) { 3181 S->AddDecl(Named); 3182 IdResolver.AddDecl(Named); 3183 } 3184 } 3185 } 3186} 3187 3188void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3189 if (!D) 3190 return; 3191 3192 TemplateParameterList *Params = 0; 3193 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3194 Params = Template->getTemplateParameters(); 3195 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3196 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3197 Params = PartialSpec->getTemplateParameters(); 3198 else 3199 return; 3200 3201 for (TemplateParameterList::iterator Param = Params->begin(), 3202 ParamEnd = Params->end(); 3203 Param != ParamEnd; ++Param) { 3204 NamedDecl *Named = cast<NamedDecl>(*Param); 3205 if (Named->getDeclName()) { 3206 S->AddDecl(Named); 3207 IdResolver.AddDecl(Named); 3208 } 3209 } 3210} 3211 3212void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3213 if (!RecordD) return; 3214 AdjustDeclIfTemplate(RecordD); 3215 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3216 PushDeclContext(S, Record); 3217} 3218 3219void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3220 if (!RecordD) return; 3221 PopDeclContext(); 3222} 3223 3224/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3225/// parsing a top-level (non-nested) C++ class, and we are now 3226/// parsing those parts of the given Method declaration that could 3227/// not be parsed earlier (C++ [class.mem]p2), such as default 3228/// arguments. This action should enter the scope of the given 3229/// Method declaration as if we had just parsed the qualified method 3230/// name. However, it should not bring the parameters into scope; 3231/// that will be performed by ActOnDelayedCXXMethodParameter. 3232void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3233} 3234 3235/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3236/// C++ method declaration. We're (re-)introducing the given 3237/// function parameter into scope for use in parsing later parts of 3238/// the method declaration. For example, we could see an 3239/// ActOnParamDefaultArgument event for this parameter. 3240void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3241 if (!ParamD) 3242 return; 3243 3244 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3245 3246 // If this parameter has an unparsed default argument, clear it out 3247 // to make way for the parsed default argument. 3248 if (Param->hasUnparsedDefaultArg()) 3249 Param->setDefaultArg(0); 3250 3251 S->AddDecl(Param); 3252 if (Param->getDeclName()) 3253 IdResolver.AddDecl(Param); 3254} 3255 3256/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3257/// processing the delayed method declaration for Method. The method 3258/// declaration is now considered finished. There may be a separate 3259/// ActOnStartOfFunctionDef action later (not necessarily 3260/// immediately!) for this method, if it was also defined inside the 3261/// class body. 3262void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3263 if (!MethodD) 3264 return; 3265 3266 AdjustDeclIfTemplate(MethodD); 3267 3268 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3269 3270 // Now that we have our default arguments, check the constructor 3271 // again. It could produce additional diagnostics or affect whether 3272 // the class has implicitly-declared destructors, among other 3273 // things. 3274 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3275 CheckConstructor(Constructor); 3276 3277 // Check the default arguments, which we may have added. 3278 if (!Method->isInvalidDecl()) 3279 CheckCXXDefaultArguments(Method); 3280} 3281 3282/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3283/// the well-formedness of the constructor declarator @p D with type @p 3284/// R. If there are any errors in the declarator, this routine will 3285/// emit diagnostics and set the invalid bit to true. In any case, the type 3286/// will be updated to reflect a well-formed type for the constructor and 3287/// returned. 3288QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3289 StorageClass &SC) { 3290 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3291 3292 // C++ [class.ctor]p3: 3293 // A constructor shall not be virtual (10.3) or static (9.4). A 3294 // constructor can be invoked for a const, volatile or const 3295 // volatile object. A constructor shall not be declared const, 3296 // volatile, or const volatile (9.3.2). 3297 if (isVirtual) { 3298 if (!D.isInvalidType()) 3299 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3300 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3301 << SourceRange(D.getIdentifierLoc()); 3302 D.setInvalidType(); 3303 } 3304 if (SC == SC_Static) { 3305 if (!D.isInvalidType()) 3306 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3307 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3308 << SourceRange(D.getIdentifierLoc()); 3309 D.setInvalidType(); 3310 SC = SC_None; 3311 } 3312 3313 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3314 if (FTI.TypeQuals != 0) { 3315 if (FTI.TypeQuals & Qualifiers::Const) 3316 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3317 << "const" << SourceRange(D.getIdentifierLoc()); 3318 if (FTI.TypeQuals & Qualifiers::Volatile) 3319 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3320 << "volatile" << SourceRange(D.getIdentifierLoc()); 3321 if (FTI.TypeQuals & Qualifiers::Restrict) 3322 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3323 << "restrict" << SourceRange(D.getIdentifierLoc()); 3324 D.setInvalidType(); 3325 } 3326 3327 // C++0x [class.ctor]p4: 3328 // A constructor shall not be declared with a ref-qualifier. 3329 if (FTI.hasRefQualifier()) { 3330 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3331 << FTI.RefQualifierIsLValueRef 3332 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3333 D.setInvalidType(); 3334 } 3335 3336 // Rebuild the function type "R" without any type qualifiers (in 3337 // case any of the errors above fired) and with "void" as the 3338 // return type, since constructors don't have return types. 3339 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3340 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3341 return R; 3342 3343 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3344 EPI.TypeQuals = 0; 3345 EPI.RefQualifier = RQ_None; 3346 3347 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3348 Proto->getNumArgs(), EPI); 3349} 3350 3351/// CheckConstructor - Checks a fully-formed constructor for 3352/// well-formedness, issuing any diagnostics required. Returns true if 3353/// the constructor declarator is invalid. 3354void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3355 CXXRecordDecl *ClassDecl 3356 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3357 if (!ClassDecl) 3358 return Constructor->setInvalidDecl(); 3359 3360 // C++ [class.copy]p3: 3361 // A declaration of a constructor for a class X is ill-formed if 3362 // its first parameter is of type (optionally cv-qualified) X and 3363 // either there are no other parameters or else all other 3364 // parameters have default arguments. 3365 if (!Constructor->isInvalidDecl() && 3366 ((Constructor->getNumParams() == 1) || 3367 (Constructor->getNumParams() > 1 && 3368 Constructor->getParamDecl(1)->hasDefaultArg())) && 3369 Constructor->getTemplateSpecializationKind() 3370 != TSK_ImplicitInstantiation) { 3371 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3372 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3373 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3374 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3375 const char *ConstRef 3376 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3377 : " const &"; 3378 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3379 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3380 3381 // FIXME: Rather that making the constructor invalid, we should endeavor 3382 // to fix the type. 3383 Constructor->setInvalidDecl(); 3384 } 3385 } 3386} 3387 3388/// CheckDestructor - Checks a fully-formed destructor definition for 3389/// well-formedness, issuing any diagnostics required. Returns true 3390/// on error. 3391bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3392 CXXRecordDecl *RD = Destructor->getParent(); 3393 3394 if (Destructor->isVirtual()) { 3395 SourceLocation Loc; 3396 3397 if (!Destructor->isImplicit()) 3398 Loc = Destructor->getLocation(); 3399 else 3400 Loc = RD->getLocation(); 3401 3402 // If we have a virtual destructor, look up the deallocation function 3403 FunctionDecl *OperatorDelete = 0; 3404 DeclarationName Name = 3405 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3406 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3407 return true; 3408 3409 MarkDeclarationReferenced(Loc, OperatorDelete); 3410 3411 Destructor->setOperatorDelete(OperatorDelete); 3412 } 3413 3414 return false; 3415} 3416 3417static inline bool 3418FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3419 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3420 FTI.ArgInfo[0].Param && 3421 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3422} 3423 3424/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3425/// the well-formednes of the destructor declarator @p D with type @p 3426/// R. If there are any errors in the declarator, this routine will 3427/// emit diagnostics and set the declarator to invalid. Even if this happens, 3428/// will be updated to reflect a well-formed type for the destructor and 3429/// returned. 3430QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3431 StorageClass& SC) { 3432 // C++ [class.dtor]p1: 3433 // [...] A typedef-name that names a class is a class-name 3434 // (7.1.3); however, a typedef-name that names a class shall not 3435 // be used as the identifier in the declarator for a destructor 3436 // declaration. 3437 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3438 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3439 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3440 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3441 3442 // C++ [class.dtor]p2: 3443 // A destructor is used to destroy objects of its class type. A 3444 // destructor takes no parameters, and no return type can be 3445 // specified for it (not even void). The address of a destructor 3446 // shall not be taken. A destructor shall not be static. A 3447 // destructor can be invoked for a const, volatile or const 3448 // volatile object. A destructor shall not be declared const, 3449 // volatile or const volatile (9.3.2). 3450 if (SC == SC_Static) { 3451 if (!D.isInvalidType()) 3452 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3453 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3454 << SourceRange(D.getIdentifierLoc()) 3455 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3456 3457 SC = SC_None; 3458 } 3459 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3460 // Destructors don't have return types, but the parser will 3461 // happily parse something like: 3462 // 3463 // class X { 3464 // float ~X(); 3465 // }; 3466 // 3467 // The return type will be eliminated later. 3468 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3469 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3470 << SourceRange(D.getIdentifierLoc()); 3471 } 3472 3473 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3474 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3475 if (FTI.TypeQuals & Qualifiers::Const) 3476 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3477 << "const" << SourceRange(D.getIdentifierLoc()); 3478 if (FTI.TypeQuals & Qualifiers::Volatile) 3479 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3480 << "volatile" << SourceRange(D.getIdentifierLoc()); 3481 if (FTI.TypeQuals & Qualifiers::Restrict) 3482 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3483 << "restrict" << SourceRange(D.getIdentifierLoc()); 3484 D.setInvalidType(); 3485 } 3486 3487 // C++0x [class.dtor]p2: 3488 // A destructor shall not be declared with a ref-qualifier. 3489 if (FTI.hasRefQualifier()) { 3490 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3491 << FTI.RefQualifierIsLValueRef 3492 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3493 D.setInvalidType(); 3494 } 3495 3496 // Make sure we don't have any parameters. 3497 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3498 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3499 3500 // Delete the parameters. 3501 FTI.freeArgs(); 3502 D.setInvalidType(); 3503 } 3504 3505 // Make sure the destructor isn't variadic. 3506 if (FTI.isVariadic) { 3507 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3508 D.setInvalidType(); 3509 } 3510 3511 // Rebuild the function type "R" without any type qualifiers or 3512 // parameters (in case any of the errors above fired) and with 3513 // "void" as the return type, since destructors don't have return 3514 // types. 3515 if (!D.isInvalidType()) 3516 return R; 3517 3518 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3519 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3520 EPI.Variadic = false; 3521 EPI.TypeQuals = 0; 3522 EPI.RefQualifier = RQ_None; 3523 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3524} 3525 3526/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3527/// well-formednes of the conversion function declarator @p D with 3528/// type @p R. If there are any errors in the declarator, this routine 3529/// will emit diagnostics and return true. Otherwise, it will return 3530/// false. Either way, the type @p R will be updated to reflect a 3531/// well-formed type for the conversion operator. 3532void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3533 StorageClass& SC) { 3534 // C++ [class.conv.fct]p1: 3535 // Neither parameter types nor return type can be specified. The 3536 // type of a conversion function (8.3.5) is "function taking no 3537 // parameter returning conversion-type-id." 3538 if (SC == SC_Static) { 3539 if (!D.isInvalidType()) 3540 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3541 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3542 << SourceRange(D.getIdentifierLoc()); 3543 D.setInvalidType(); 3544 SC = SC_None; 3545 } 3546 3547 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3548 3549 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3550 // Conversion functions don't have return types, but the parser will 3551 // happily parse something like: 3552 // 3553 // class X { 3554 // float operator bool(); 3555 // }; 3556 // 3557 // The return type will be changed later anyway. 3558 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3559 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3560 << SourceRange(D.getIdentifierLoc()); 3561 D.setInvalidType(); 3562 } 3563 3564 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3565 3566 // Make sure we don't have any parameters. 3567 if (Proto->getNumArgs() > 0) { 3568 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3569 3570 // Delete the parameters. 3571 D.getFunctionTypeInfo().freeArgs(); 3572 D.setInvalidType(); 3573 } else if (Proto->isVariadic()) { 3574 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3575 D.setInvalidType(); 3576 } 3577 3578 // Diagnose "&operator bool()" and other such nonsense. This 3579 // is actually a gcc extension which we don't support. 3580 if (Proto->getResultType() != ConvType) { 3581 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3582 << Proto->getResultType(); 3583 D.setInvalidType(); 3584 ConvType = Proto->getResultType(); 3585 } 3586 3587 // C++ [class.conv.fct]p4: 3588 // The conversion-type-id shall not represent a function type nor 3589 // an array type. 3590 if (ConvType->isArrayType()) { 3591 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3592 ConvType = Context.getPointerType(ConvType); 3593 D.setInvalidType(); 3594 } else if (ConvType->isFunctionType()) { 3595 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3596 ConvType = Context.getPointerType(ConvType); 3597 D.setInvalidType(); 3598 } 3599 3600 // Rebuild the function type "R" without any parameters (in case any 3601 // of the errors above fired) and with the conversion type as the 3602 // return type. 3603 if (D.isInvalidType()) 3604 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3605 3606 // C++0x explicit conversion operators. 3607 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3608 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3609 diag::warn_explicit_conversion_functions) 3610 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3611} 3612 3613/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3614/// the declaration of the given C++ conversion function. This routine 3615/// is responsible for recording the conversion function in the C++ 3616/// class, if possible. 3617Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3618 assert(Conversion && "Expected to receive a conversion function declaration"); 3619 3620 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3621 3622 // Make sure we aren't redeclaring the conversion function. 3623 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3624 3625 // C++ [class.conv.fct]p1: 3626 // [...] A conversion function is never used to convert a 3627 // (possibly cv-qualified) object to the (possibly cv-qualified) 3628 // same object type (or a reference to it), to a (possibly 3629 // cv-qualified) base class of that type (or a reference to it), 3630 // or to (possibly cv-qualified) void. 3631 // FIXME: Suppress this warning if the conversion function ends up being a 3632 // virtual function that overrides a virtual function in a base class. 3633 QualType ClassType 3634 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3635 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3636 ConvType = ConvTypeRef->getPointeeType(); 3637 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3638 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3639 /* Suppress diagnostics for instantiations. */; 3640 else if (ConvType->isRecordType()) { 3641 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3642 if (ConvType == ClassType) 3643 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3644 << ClassType; 3645 else if (IsDerivedFrom(ClassType, ConvType)) 3646 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3647 << ClassType << ConvType; 3648 } else if (ConvType->isVoidType()) { 3649 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3650 << ClassType << ConvType; 3651 } 3652 3653 if (FunctionTemplateDecl *ConversionTemplate 3654 = Conversion->getDescribedFunctionTemplate()) 3655 return ConversionTemplate; 3656 3657 return Conversion; 3658} 3659 3660//===----------------------------------------------------------------------===// 3661// Namespace Handling 3662//===----------------------------------------------------------------------===// 3663 3664 3665 3666/// ActOnStartNamespaceDef - This is called at the start of a namespace 3667/// definition. 3668Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3669 SourceLocation InlineLoc, 3670 SourceLocation NamespaceLoc, 3671 SourceLocation IdentLoc, 3672 IdentifierInfo *II, 3673 SourceLocation LBrace, 3674 AttributeList *AttrList) { 3675 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3676 // For anonymous namespace, take the location of the left brace. 3677 SourceLocation Loc = II ? IdentLoc : LBrace; 3678 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3679 StartLoc, Loc, II); 3680 Namespc->setInline(InlineLoc.isValid()); 3681 3682 Scope *DeclRegionScope = NamespcScope->getParent(); 3683 3684 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3685 3686 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3687 PushNamespaceVisibilityAttr(Attr); 3688 3689 if (II) { 3690 // C++ [namespace.def]p2: 3691 // The identifier in an original-namespace-definition shall not 3692 // have been previously defined in the declarative region in 3693 // which the original-namespace-definition appears. The 3694 // identifier in an original-namespace-definition is the name of 3695 // the namespace. Subsequently in that declarative region, it is 3696 // treated as an original-namespace-name. 3697 // 3698 // Since namespace names are unique in their scope, and we don't 3699 // look through using directives, just 3700 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3701 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3702 3703 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3704 // This is an extended namespace definition. 3705 if (Namespc->isInline() != OrigNS->isInline()) { 3706 // inline-ness must match 3707 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3708 << Namespc->isInline(); 3709 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3710 Namespc->setInvalidDecl(); 3711 // Recover by ignoring the new namespace's inline status. 3712 Namespc->setInline(OrigNS->isInline()); 3713 } 3714 3715 // Attach this namespace decl to the chain of extended namespace 3716 // definitions. 3717 OrigNS->setNextNamespace(Namespc); 3718 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3719 3720 // Remove the previous declaration from the scope. 3721 if (DeclRegionScope->isDeclScope(OrigNS)) { 3722 IdResolver.RemoveDecl(OrigNS); 3723 DeclRegionScope->RemoveDecl(OrigNS); 3724 } 3725 } else if (PrevDecl) { 3726 // This is an invalid name redefinition. 3727 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3728 << Namespc->getDeclName(); 3729 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3730 Namespc->setInvalidDecl(); 3731 // Continue on to push Namespc as current DeclContext and return it. 3732 } else if (II->isStr("std") && 3733 CurContext->getRedeclContext()->isTranslationUnit()) { 3734 // This is the first "real" definition of the namespace "std", so update 3735 // our cache of the "std" namespace to point at this definition. 3736 if (NamespaceDecl *StdNS = getStdNamespace()) { 3737 // We had already defined a dummy namespace "std". Link this new 3738 // namespace definition to the dummy namespace "std". 3739 StdNS->setNextNamespace(Namespc); 3740 StdNS->setLocation(IdentLoc); 3741 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3742 } 3743 3744 // Make our StdNamespace cache point at the first real definition of the 3745 // "std" namespace. 3746 StdNamespace = Namespc; 3747 } 3748 3749 PushOnScopeChains(Namespc, DeclRegionScope); 3750 } else { 3751 // Anonymous namespaces. 3752 assert(Namespc->isAnonymousNamespace()); 3753 3754 // Link the anonymous namespace into its parent. 3755 NamespaceDecl *PrevDecl; 3756 DeclContext *Parent = CurContext->getRedeclContext(); 3757 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3758 PrevDecl = TU->getAnonymousNamespace(); 3759 TU->setAnonymousNamespace(Namespc); 3760 } else { 3761 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3762 PrevDecl = ND->getAnonymousNamespace(); 3763 ND->setAnonymousNamespace(Namespc); 3764 } 3765 3766 // Link the anonymous namespace with its previous declaration. 3767 if (PrevDecl) { 3768 assert(PrevDecl->isAnonymousNamespace()); 3769 assert(!PrevDecl->getNextNamespace()); 3770 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3771 PrevDecl->setNextNamespace(Namespc); 3772 3773 if (Namespc->isInline() != PrevDecl->isInline()) { 3774 // inline-ness must match 3775 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3776 << Namespc->isInline(); 3777 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3778 Namespc->setInvalidDecl(); 3779 // Recover by ignoring the new namespace's inline status. 3780 Namespc->setInline(PrevDecl->isInline()); 3781 } 3782 } 3783 3784 CurContext->addDecl(Namespc); 3785 3786 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3787 // behaves as if it were replaced by 3788 // namespace unique { /* empty body */ } 3789 // using namespace unique; 3790 // namespace unique { namespace-body } 3791 // where all occurrences of 'unique' in a translation unit are 3792 // replaced by the same identifier and this identifier differs 3793 // from all other identifiers in the entire program. 3794 3795 // We just create the namespace with an empty name and then add an 3796 // implicit using declaration, just like the standard suggests. 3797 // 3798 // CodeGen enforces the "universally unique" aspect by giving all 3799 // declarations semantically contained within an anonymous 3800 // namespace internal linkage. 3801 3802 if (!PrevDecl) { 3803 UsingDirectiveDecl* UD 3804 = UsingDirectiveDecl::Create(Context, CurContext, 3805 /* 'using' */ LBrace, 3806 /* 'namespace' */ SourceLocation(), 3807 /* qualifier */ NestedNameSpecifierLoc(), 3808 /* identifier */ SourceLocation(), 3809 Namespc, 3810 /* Ancestor */ CurContext); 3811 UD->setImplicit(); 3812 CurContext->addDecl(UD); 3813 } 3814 } 3815 3816 // Although we could have an invalid decl (i.e. the namespace name is a 3817 // redefinition), push it as current DeclContext and try to continue parsing. 3818 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3819 // for the namespace has the declarations that showed up in that particular 3820 // namespace definition. 3821 PushDeclContext(NamespcScope, Namespc); 3822 return Namespc; 3823} 3824 3825/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3826/// is a namespace alias, returns the namespace it points to. 3827static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3828 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3829 return AD->getNamespace(); 3830 return dyn_cast_or_null<NamespaceDecl>(D); 3831} 3832 3833/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3834/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3835void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3836 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3837 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3838 Namespc->setRBraceLoc(RBrace); 3839 PopDeclContext(); 3840 if (Namespc->hasAttr<VisibilityAttr>()) 3841 PopPragmaVisibility(); 3842} 3843 3844CXXRecordDecl *Sema::getStdBadAlloc() const { 3845 return cast_or_null<CXXRecordDecl>( 3846 StdBadAlloc.get(Context.getExternalSource())); 3847} 3848 3849NamespaceDecl *Sema::getStdNamespace() const { 3850 return cast_or_null<NamespaceDecl>( 3851 StdNamespace.get(Context.getExternalSource())); 3852} 3853 3854/// \brief Retrieve the special "std" namespace, which may require us to 3855/// implicitly define the namespace. 3856NamespaceDecl *Sema::getOrCreateStdNamespace() { 3857 if (!StdNamespace) { 3858 // The "std" namespace has not yet been defined, so build one implicitly. 3859 StdNamespace = NamespaceDecl::Create(Context, 3860 Context.getTranslationUnitDecl(), 3861 SourceLocation(), SourceLocation(), 3862 &PP.getIdentifierTable().get("std")); 3863 getStdNamespace()->setImplicit(true); 3864 } 3865 3866 return getStdNamespace(); 3867} 3868 3869/// \brief Determine whether a using statement is in a context where it will be 3870/// apply in all contexts. 3871static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3872 switch (CurContext->getDeclKind()) { 3873 case Decl::TranslationUnit: 3874 return true; 3875 case Decl::LinkageSpec: 3876 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3877 default: 3878 return false; 3879 } 3880} 3881 3882Decl *Sema::ActOnUsingDirective(Scope *S, 3883 SourceLocation UsingLoc, 3884 SourceLocation NamespcLoc, 3885 CXXScopeSpec &SS, 3886 SourceLocation IdentLoc, 3887 IdentifierInfo *NamespcName, 3888 AttributeList *AttrList) { 3889 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3890 assert(NamespcName && "Invalid NamespcName."); 3891 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3892 3893 // This can only happen along a recovery path. 3894 while (S->getFlags() & Scope::TemplateParamScope) 3895 S = S->getParent(); 3896 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3897 3898 UsingDirectiveDecl *UDir = 0; 3899 NestedNameSpecifier *Qualifier = 0; 3900 if (SS.isSet()) 3901 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3902 3903 // Lookup namespace name. 3904 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3905 LookupParsedName(R, S, &SS); 3906 if (R.isAmbiguous()) 3907 return 0; 3908 3909 if (R.empty()) { 3910 // Allow "using namespace std;" or "using namespace ::std;" even if 3911 // "std" hasn't been defined yet, for GCC compatibility. 3912 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3913 NamespcName->isStr("std")) { 3914 Diag(IdentLoc, diag::ext_using_undefined_std); 3915 R.addDecl(getOrCreateStdNamespace()); 3916 R.resolveKind(); 3917 } 3918 // Otherwise, attempt typo correction. 3919 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3920 CTC_NoKeywords, 0)) { 3921 if (R.getAsSingle<NamespaceDecl>() || 3922 R.getAsSingle<NamespaceAliasDecl>()) { 3923 if (DeclContext *DC = computeDeclContext(SS, false)) 3924 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3925 << NamespcName << DC << Corrected << SS.getRange() 3926 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3927 else 3928 Diag(IdentLoc, diag::err_using_directive_suggest) 3929 << NamespcName << Corrected 3930 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3931 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3932 << Corrected; 3933 3934 NamespcName = Corrected.getAsIdentifierInfo(); 3935 } else { 3936 R.clear(); 3937 R.setLookupName(NamespcName); 3938 } 3939 } 3940 } 3941 3942 if (!R.empty()) { 3943 NamedDecl *Named = R.getFoundDecl(); 3944 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3945 && "expected namespace decl"); 3946 // C++ [namespace.udir]p1: 3947 // A using-directive specifies that the names in the nominated 3948 // namespace can be used in the scope in which the 3949 // using-directive appears after the using-directive. During 3950 // unqualified name lookup (3.4.1), the names appear as if they 3951 // were declared in the nearest enclosing namespace which 3952 // contains both the using-directive and the nominated 3953 // namespace. [Note: in this context, "contains" means "contains 3954 // directly or indirectly". ] 3955 3956 // Find enclosing context containing both using-directive and 3957 // nominated namespace. 3958 NamespaceDecl *NS = getNamespaceDecl(Named); 3959 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3960 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3961 CommonAncestor = CommonAncestor->getParent(); 3962 3963 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3964 SS.getWithLocInContext(Context), 3965 IdentLoc, Named, CommonAncestor); 3966 3967 if (IsUsingDirectiveInToplevelContext(CurContext) && 3968 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 3969 Diag(IdentLoc, diag::warn_using_directive_in_header); 3970 } 3971 3972 PushUsingDirective(S, UDir); 3973 } else { 3974 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3975 } 3976 3977 // FIXME: We ignore attributes for now. 3978 return UDir; 3979} 3980 3981void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3982 // If scope has associated entity, then using directive is at namespace 3983 // or translation unit scope. We add UsingDirectiveDecls, into 3984 // it's lookup structure. 3985 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3986 Ctx->addDecl(UDir); 3987 else 3988 // Otherwise it is block-sope. using-directives will affect lookup 3989 // only to the end of scope. 3990 S->PushUsingDirective(UDir); 3991} 3992 3993 3994Decl *Sema::ActOnUsingDeclaration(Scope *S, 3995 AccessSpecifier AS, 3996 bool HasUsingKeyword, 3997 SourceLocation UsingLoc, 3998 CXXScopeSpec &SS, 3999 UnqualifiedId &Name, 4000 AttributeList *AttrList, 4001 bool IsTypeName, 4002 SourceLocation TypenameLoc) { 4003 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4004 4005 switch (Name.getKind()) { 4006 case UnqualifiedId::IK_Identifier: 4007 case UnqualifiedId::IK_OperatorFunctionId: 4008 case UnqualifiedId::IK_LiteralOperatorId: 4009 case UnqualifiedId::IK_ConversionFunctionId: 4010 break; 4011 4012 case UnqualifiedId::IK_ConstructorName: 4013 case UnqualifiedId::IK_ConstructorTemplateId: 4014 // C++0x inherited constructors. 4015 if (getLangOptions().CPlusPlus0x) break; 4016 4017 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4018 << SS.getRange(); 4019 return 0; 4020 4021 case UnqualifiedId::IK_DestructorName: 4022 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4023 << SS.getRange(); 4024 return 0; 4025 4026 case UnqualifiedId::IK_TemplateId: 4027 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4028 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4029 return 0; 4030 } 4031 4032 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4033 DeclarationName TargetName = TargetNameInfo.getName(); 4034 if (!TargetName) 4035 return 0; 4036 4037 // Warn about using declarations. 4038 // TODO: store that the declaration was written without 'using' and 4039 // talk about access decls instead of using decls in the 4040 // diagnostics. 4041 if (!HasUsingKeyword) { 4042 UsingLoc = Name.getSourceRange().getBegin(); 4043 4044 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4045 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4046 } 4047 4048 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4049 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4050 return 0; 4051 4052 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4053 TargetNameInfo, AttrList, 4054 /* IsInstantiation */ false, 4055 IsTypeName, TypenameLoc); 4056 if (UD) 4057 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4058 4059 return UD; 4060} 4061 4062/// \brief Determine whether a using declaration considers the given 4063/// declarations as "equivalent", e.g., if they are redeclarations of 4064/// the same entity or are both typedefs of the same type. 4065static bool 4066IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4067 bool &SuppressRedeclaration) { 4068 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4069 SuppressRedeclaration = false; 4070 return true; 4071 } 4072 4073 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4074 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4075 SuppressRedeclaration = true; 4076 return Context.hasSameType(TD1->getUnderlyingType(), 4077 TD2->getUnderlyingType()); 4078 } 4079 4080 return false; 4081} 4082 4083 4084/// Determines whether to create a using shadow decl for a particular 4085/// decl, given the set of decls existing prior to this using lookup. 4086bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4087 const LookupResult &Previous) { 4088 // Diagnose finding a decl which is not from a base class of the 4089 // current class. We do this now because there are cases where this 4090 // function will silently decide not to build a shadow decl, which 4091 // will pre-empt further diagnostics. 4092 // 4093 // We don't need to do this in C++0x because we do the check once on 4094 // the qualifier. 4095 // 4096 // FIXME: diagnose the following if we care enough: 4097 // struct A { int foo; }; 4098 // struct B : A { using A::foo; }; 4099 // template <class T> struct C : A {}; 4100 // template <class T> struct D : C<T> { using B::foo; } // <--- 4101 // This is invalid (during instantiation) in C++03 because B::foo 4102 // resolves to the using decl in B, which is not a base class of D<T>. 4103 // We can't diagnose it immediately because C<T> is an unknown 4104 // specialization. The UsingShadowDecl in D<T> then points directly 4105 // to A::foo, which will look well-formed when we instantiate. 4106 // The right solution is to not collapse the shadow-decl chain. 4107 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4108 DeclContext *OrigDC = Orig->getDeclContext(); 4109 4110 // Handle enums and anonymous structs. 4111 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4112 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4113 while (OrigRec->isAnonymousStructOrUnion()) 4114 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4115 4116 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4117 if (OrigDC == CurContext) { 4118 Diag(Using->getLocation(), 4119 diag::err_using_decl_nested_name_specifier_is_current_class) 4120 << Using->getQualifierLoc().getSourceRange(); 4121 Diag(Orig->getLocation(), diag::note_using_decl_target); 4122 return true; 4123 } 4124 4125 Diag(Using->getQualifierLoc().getBeginLoc(), 4126 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4127 << Using->getQualifier() 4128 << cast<CXXRecordDecl>(CurContext) 4129 << Using->getQualifierLoc().getSourceRange(); 4130 Diag(Orig->getLocation(), diag::note_using_decl_target); 4131 return true; 4132 } 4133 } 4134 4135 if (Previous.empty()) return false; 4136 4137 NamedDecl *Target = Orig; 4138 if (isa<UsingShadowDecl>(Target)) 4139 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4140 4141 // If the target happens to be one of the previous declarations, we 4142 // don't have a conflict. 4143 // 4144 // FIXME: but we might be increasing its access, in which case we 4145 // should redeclare it. 4146 NamedDecl *NonTag = 0, *Tag = 0; 4147 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4148 I != E; ++I) { 4149 NamedDecl *D = (*I)->getUnderlyingDecl(); 4150 bool Result; 4151 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4152 return Result; 4153 4154 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4155 } 4156 4157 if (Target->isFunctionOrFunctionTemplate()) { 4158 FunctionDecl *FD; 4159 if (isa<FunctionTemplateDecl>(Target)) 4160 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4161 else 4162 FD = cast<FunctionDecl>(Target); 4163 4164 NamedDecl *OldDecl = 0; 4165 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4166 case Ovl_Overload: 4167 return false; 4168 4169 case Ovl_NonFunction: 4170 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4171 break; 4172 4173 // We found a decl with the exact signature. 4174 case Ovl_Match: 4175 // If we're in a record, we want to hide the target, so we 4176 // return true (without a diagnostic) to tell the caller not to 4177 // build a shadow decl. 4178 if (CurContext->isRecord()) 4179 return true; 4180 4181 // If we're not in a record, this is an error. 4182 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4183 break; 4184 } 4185 4186 Diag(Target->getLocation(), diag::note_using_decl_target); 4187 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4188 return true; 4189 } 4190 4191 // Target is not a function. 4192 4193 if (isa<TagDecl>(Target)) { 4194 // No conflict between a tag and a non-tag. 4195 if (!Tag) return false; 4196 4197 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4198 Diag(Target->getLocation(), diag::note_using_decl_target); 4199 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4200 return true; 4201 } 4202 4203 // No conflict between a tag and a non-tag. 4204 if (!NonTag) return false; 4205 4206 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4207 Diag(Target->getLocation(), diag::note_using_decl_target); 4208 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4209 return true; 4210} 4211 4212/// Builds a shadow declaration corresponding to a 'using' declaration. 4213UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4214 UsingDecl *UD, 4215 NamedDecl *Orig) { 4216 4217 // If we resolved to another shadow declaration, just coalesce them. 4218 NamedDecl *Target = Orig; 4219 if (isa<UsingShadowDecl>(Target)) { 4220 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4221 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4222 } 4223 4224 UsingShadowDecl *Shadow 4225 = UsingShadowDecl::Create(Context, CurContext, 4226 UD->getLocation(), UD, Target); 4227 UD->addShadowDecl(Shadow); 4228 4229 Shadow->setAccess(UD->getAccess()); 4230 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4231 Shadow->setInvalidDecl(); 4232 4233 if (S) 4234 PushOnScopeChains(Shadow, S); 4235 else 4236 CurContext->addDecl(Shadow); 4237 4238 4239 return Shadow; 4240} 4241 4242/// Hides a using shadow declaration. This is required by the current 4243/// using-decl implementation when a resolvable using declaration in a 4244/// class is followed by a declaration which would hide or override 4245/// one or more of the using decl's targets; for example: 4246/// 4247/// struct Base { void foo(int); }; 4248/// struct Derived : Base { 4249/// using Base::foo; 4250/// void foo(int); 4251/// }; 4252/// 4253/// The governing language is C++03 [namespace.udecl]p12: 4254/// 4255/// When a using-declaration brings names from a base class into a 4256/// derived class scope, member functions in the derived class 4257/// override and/or hide member functions with the same name and 4258/// parameter types in a base class (rather than conflicting). 4259/// 4260/// There are two ways to implement this: 4261/// (1) optimistically create shadow decls when they're not hidden 4262/// by existing declarations, or 4263/// (2) don't create any shadow decls (or at least don't make them 4264/// visible) until we've fully parsed/instantiated the class. 4265/// The problem with (1) is that we might have to retroactively remove 4266/// a shadow decl, which requires several O(n) operations because the 4267/// decl structures are (very reasonably) not designed for removal. 4268/// (2) avoids this but is very fiddly and phase-dependent. 4269void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4270 if (Shadow->getDeclName().getNameKind() == 4271 DeclarationName::CXXConversionFunctionName) 4272 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4273 4274 // Remove it from the DeclContext... 4275 Shadow->getDeclContext()->removeDecl(Shadow); 4276 4277 // ...and the scope, if applicable... 4278 if (S) { 4279 S->RemoveDecl(Shadow); 4280 IdResolver.RemoveDecl(Shadow); 4281 } 4282 4283 // ...and the using decl. 4284 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4285 4286 // TODO: complain somehow if Shadow was used. It shouldn't 4287 // be possible for this to happen, because...? 4288} 4289 4290/// Builds a using declaration. 4291/// 4292/// \param IsInstantiation - Whether this call arises from an 4293/// instantiation of an unresolved using declaration. We treat 4294/// the lookup differently for these declarations. 4295NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4296 SourceLocation UsingLoc, 4297 CXXScopeSpec &SS, 4298 const DeclarationNameInfo &NameInfo, 4299 AttributeList *AttrList, 4300 bool IsInstantiation, 4301 bool IsTypeName, 4302 SourceLocation TypenameLoc) { 4303 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4304 SourceLocation IdentLoc = NameInfo.getLoc(); 4305 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4306 4307 // FIXME: We ignore attributes for now. 4308 4309 if (SS.isEmpty()) { 4310 Diag(IdentLoc, diag::err_using_requires_qualname); 4311 return 0; 4312 } 4313 4314 // Do the redeclaration lookup in the current scope. 4315 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4316 ForRedeclaration); 4317 Previous.setHideTags(false); 4318 if (S) { 4319 LookupName(Previous, S); 4320 4321 // It is really dumb that we have to do this. 4322 LookupResult::Filter F = Previous.makeFilter(); 4323 while (F.hasNext()) { 4324 NamedDecl *D = F.next(); 4325 if (!isDeclInScope(D, CurContext, S)) 4326 F.erase(); 4327 } 4328 F.done(); 4329 } else { 4330 assert(IsInstantiation && "no scope in non-instantiation"); 4331 assert(CurContext->isRecord() && "scope not record in instantiation"); 4332 LookupQualifiedName(Previous, CurContext); 4333 } 4334 4335 // Check for invalid redeclarations. 4336 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4337 return 0; 4338 4339 // Check for bad qualifiers. 4340 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4341 return 0; 4342 4343 DeclContext *LookupContext = computeDeclContext(SS); 4344 NamedDecl *D; 4345 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4346 if (!LookupContext) { 4347 if (IsTypeName) { 4348 // FIXME: not all declaration name kinds are legal here 4349 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4350 UsingLoc, TypenameLoc, 4351 QualifierLoc, 4352 IdentLoc, NameInfo.getName()); 4353 } else { 4354 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4355 QualifierLoc, NameInfo); 4356 } 4357 } else { 4358 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4359 NameInfo, IsTypeName); 4360 } 4361 D->setAccess(AS); 4362 CurContext->addDecl(D); 4363 4364 if (!LookupContext) return D; 4365 UsingDecl *UD = cast<UsingDecl>(D); 4366 4367 if (RequireCompleteDeclContext(SS, LookupContext)) { 4368 UD->setInvalidDecl(); 4369 return UD; 4370 } 4371 4372 // Constructor inheriting using decls get special treatment. 4373 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4374 if (CheckInheritedConstructorUsingDecl(UD)) 4375 UD->setInvalidDecl(); 4376 return UD; 4377 } 4378 4379 // Otherwise, look up the target name. 4380 4381 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4382 4383 // Unlike most lookups, we don't always want to hide tag 4384 // declarations: tag names are visible through the using declaration 4385 // even if hidden by ordinary names, *except* in a dependent context 4386 // where it's important for the sanity of two-phase lookup. 4387 if (!IsInstantiation) 4388 R.setHideTags(false); 4389 4390 LookupQualifiedName(R, LookupContext); 4391 4392 if (R.empty()) { 4393 Diag(IdentLoc, diag::err_no_member) 4394 << NameInfo.getName() << LookupContext << SS.getRange(); 4395 UD->setInvalidDecl(); 4396 return UD; 4397 } 4398 4399 if (R.isAmbiguous()) { 4400 UD->setInvalidDecl(); 4401 return UD; 4402 } 4403 4404 if (IsTypeName) { 4405 // If we asked for a typename and got a non-type decl, error out. 4406 if (!R.getAsSingle<TypeDecl>()) { 4407 Diag(IdentLoc, diag::err_using_typename_non_type); 4408 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4409 Diag((*I)->getUnderlyingDecl()->getLocation(), 4410 diag::note_using_decl_target); 4411 UD->setInvalidDecl(); 4412 return UD; 4413 } 4414 } else { 4415 // If we asked for a non-typename and we got a type, error out, 4416 // but only if this is an instantiation of an unresolved using 4417 // decl. Otherwise just silently find the type name. 4418 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4419 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4420 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4421 UD->setInvalidDecl(); 4422 return UD; 4423 } 4424 } 4425 4426 // C++0x N2914 [namespace.udecl]p6: 4427 // A using-declaration shall not name a namespace. 4428 if (R.getAsSingle<NamespaceDecl>()) { 4429 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4430 << SS.getRange(); 4431 UD->setInvalidDecl(); 4432 return UD; 4433 } 4434 4435 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4436 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4437 BuildUsingShadowDecl(S, UD, *I); 4438 } 4439 4440 return UD; 4441} 4442 4443/// Additional checks for a using declaration referring to a constructor name. 4444bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4445 if (UD->isTypeName()) { 4446 // FIXME: Cannot specify typename when specifying constructor 4447 return true; 4448 } 4449 4450 const Type *SourceType = UD->getQualifier()->getAsType(); 4451 assert(SourceType && 4452 "Using decl naming constructor doesn't have type in scope spec."); 4453 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4454 4455 // Check whether the named type is a direct base class. 4456 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4457 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4458 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4459 BaseIt != BaseE; ++BaseIt) { 4460 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4461 if (CanonicalSourceType == BaseType) 4462 break; 4463 } 4464 4465 if (BaseIt == BaseE) { 4466 // Did not find SourceType in the bases. 4467 Diag(UD->getUsingLocation(), 4468 diag::err_using_decl_constructor_not_in_direct_base) 4469 << UD->getNameInfo().getSourceRange() 4470 << QualType(SourceType, 0) << TargetClass; 4471 return true; 4472 } 4473 4474 BaseIt->setInheritConstructors(); 4475 4476 return false; 4477} 4478 4479/// Checks that the given using declaration is not an invalid 4480/// redeclaration. Note that this is checking only for the using decl 4481/// itself, not for any ill-formedness among the UsingShadowDecls. 4482bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4483 bool isTypeName, 4484 const CXXScopeSpec &SS, 4485 SourceLocation NameLoc, 4486 const LookupResult &Prev) { 4487 // C++03 [namespace.udecl]p8: 4488 // C++0x [namespace.udecl]p10: 4489 // A using-declaration is a declaration and can therefore be used 4490 // repeatedly where (and only where) multiple declarations are 4491 // allowed. 4492 // 4493 // That's in non-member contexts. 4494 if (!CurContext->getRedeclContext()->isRecord()) 4495 return false; 4496 4497 NestedNameSpecifier *Qual 4498 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4499 4500 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4501 NamedDecl *D = *I; 4502 4503 bool DTypename; 4504 NestedNameSpecifier *DQual; 4505 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4506 DTypename = UD->isTypeName(); 4507 DQual = UD->getQualifier(); 4508 } else if (UnresolvedUsingValueDecl *UD 4509 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4510 DTypename = false; 4511 DQual = UD->getQualifier(); 4512 } else if (UnresolvedUsingTypenameDecl *UD 4513 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4514 DTypename = true; 4515 DQual = UD->getQualifier(); 4516 } else continue; 4517 4518 // using decls differ if one says 'typename' and the other doesn't. 4519 // FIXME: non-dependent using decls? 4520 if (isTypeName != DTypename) continue; 4521 4522 // using decls differ if they name different scopes (but note that 4523 // template instantiation can cause this check to trigger when it 4524 // didn't before instantiation). 4525 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4526 Context.getCanonicalNestedNameSpecifier(DQual)) 4527 continue; 4528 4529 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4530 Diag(D->getLocation(), diag::note_using_decl) << 1; 4531 return true; 4532 } 4533 4534 return false; 4535} 4536 4537 4538/// Checks that the given nested-name qualifier used in a using decl 4539/// in the current context is appropriately related to the current 4540/// scope. If an error is found, diagnoses it and returns true. 4541bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4542 const CXXScopeSpec &SS, 4543 SourceLocation NameLoc) { 4544 DeclContext *NamedContext = computeDeclContext(SS); 4545 4546 if (!CurContext->isRecord()) { 4547 // C++03 [namespace.udecl]p3: 4548 // C++0x [namespace.udecl]p8: 4549 // A using-declaration for a class member shall be a member-declaration. 4550 4551 // If we weren't able to compute a valid scope, it must be a 4552 // dependent class scope. 4553 if (!NamedContext || NamedContext->isRecord()) { 4554 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4555 << SS.getRange(); 4556 return true; 4557 } 4558 4559 // Otherwise, everything is known to be fine. 4560 return false; 4561 } 4562 4563 // The current scope is a record. 4564 4565 // If the named context is dependent, we can't decide much. 4566 if (!NamedContext) { 4567 // FIXME: in C++0x, we can diagnose if we can prove that the 4568 // nested-name-specifier does not refer to a base class, which is 4569 // still possible in some cases. 4570 4571 // Otherwise we have to conservatively report that things might be 4572 // okay. 4573 return false; 4574 } 4575 4576 if (!NamedContext->isRecord()) { 4577 // Ideally this would point at the last name in the specifier, 4578 // but we don't have that level of source info. 4579 Diag(SS.getRange().getBegin(), 4580 diag::err_using_decl_nested_name_specifier_is_not_class) 4581 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4582 return true; 4583 } 4584 4585 if (!NamedContext->isDependentContext() && 4586 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4587 return true; 4588 4589 if (getLangOptions().CPlusPlus0x) { 4590 // C++0x [namespace.udecl]p3: 4591 // In a using-declaration used as a member-declaration, the 4592 // nested-name-specifier shall name a base class of the class 4593 // being defined. 4594 4595 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4596 cast<CXXRecordDecl>(NamedContext))) { 4597 if (CurContext == NamedContext) { 4598 Diag(NameLoc, 4599 diag::err_using_decl_nested_name_specifier_is_current_class) 4600 << SS.getRange(); 4601 return true; 4602 } 4603 4604 Diag(SS.getRange().getBegin(), 4605 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4606 << (NestedNameSpecifier*) SS.getScopeRep() 4607 << cast<CXXRecordDecl>(CurContext) 4608 << SS.getRange(); 4609 return true; 4610 } 4611 4612 return false; 4613 } 4614 4615 // C++03 [namespace.udecl]p4: 4616 // A using-declaration used as a member-declaration shall refer 4617 // to a member of a base class of the class being defined [etc.]. 4618 4619 // Salient point: SS doesn't have to name a base class as long as 4620 // lookup only finds members from base classes. Therefore we can 4621 // diagnose here only if we can prove that that can't happen, 4622 // i.e. if the class hierarchies provably don't intersect. 4623 4624 // TODO: it would be nice if "definitely valid" results were cached 4625 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4626 // need to be repeated. 4627 4628 struct UserData { 4629 llvm::DenseSet<const CXXRecordDecl*> Bases; 4630 4631 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4632 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4633 Data->Bases.insert(Base); 4634 return true; 4635 } 4636 4637 bool hasDependentBases(const CXXRecordDecl *Class) { 4638 return !Class->forallBases(collect, this); 4639 } 4640 4641 /// Returns true if the base is dependent or is one of the 4642 /// accumulated base classes. 4643 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4644 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4645 return !Data->Bases.count(Base); 4646 } 4647 4648 bool mightShareBases(const CXXRecordDecl *Class) { 4649 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4650 } 4651 }; 4652 4653 UserData Data; 4654 4655 // Returns false if we find a dependent base. 4656 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4657 return false; 4658 4659 // Returns false if the class has a dependent base or if it or one 4660 // of its bases is present in the base set of the current context. 4661 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4662 return false; 4663 4664 Diag(SS.getRange().getBegin(), 4665 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4666 << (NestedNameSpecifier*) SS.getScopeRep() 4667 << cast<CXXRecordDecl>(CurContext) 4668 << SS.getRange(); 4669 4670 return true; 4671} 4672 4673Decl *Sema::ActOnAliasDeclaration(Scope *S, 4674 AccessSpecifier AS, 4675 SourceLocation UsingLoc, 4676 UnqualifiedId &Name, 4677 TypeResult Type) { 4678 assert((S->getFlags() & Scope::DeclScope) && 4679 "got alias-declaration outside of declaration scope"); 4680 4681 if (Type.isInvalid()) 4682 return 0; 4683 4684 bool Invalid = false; 4685 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4686 TypeSourceInfo *TInfo = 0; 4687 QualType T = GetTypeFromParser(Type.get(), &TInfo); 4688 4689 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4690 return 0; 4691 4692 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4693 UPPC_DeclarationType)) 4694 Invalid = true; 4695 4696 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4697 LookupName(Previous, S); 4698 4699 // Warn about shadowing the name of a template parameter. 4700 if (Previous.isSingleResult() && 4701 Previous.getFoundDecl()->isTemplateParameter()) { 4702 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4703 Previous.getFoundDecl())) 4704 Invalid = true; 4705 Previous.clear(); 4706 } 4707 4708 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4709 "name in alias declaration must be an identifier"); 4710 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4711 Name.StartLocation, 4712 Name.Identifier, TInfo); 4713 4714 NewTD->setAccess(AS); 4715 4716 if (Invalid) 4717 NewTD->setInvalidDecl(); 4718 4719 bool Redeclaration = false; 4720 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4721 4722 if (!Redeclaration) 4723 PushOnScopeChains(NewTD, S); 4724 4725 return NewTD; 4726} 4727 4728Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4729 SourceLocation NamespaceLoc, 4730 SourceLocation AliasLoc, 4731 IdentifierInfo *Alias, 4732 CXXScopeSpec &SS, 4733 SourceLocation IdentLoc, 4734 IdentifierInfo *Ident) { 4735 4736 // Lookup the namespace name. 4737 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4738 LookupParsedName(R, S, &SS); 4739 4740 // Check if we have a previous declaration with the same name. 4741 NamedDecl *PrevDecl 4742 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4743 ForRedeclaration); 4744 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4745 PrevDecl = 0; 4746 4747 if (PrevDecl) { 4748 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4749 // We already have an alias with the same name that points to the same 4750 // namespace, so don't create a new one. 4751 // FIXME: At some point, we'll want to create the (redundant) 4752 // declaration to maintain better source information. 4753 if (!R.isAmbiguous() && !R.empty() && 4754 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4755 return 0; 4756 } 4757 4758 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4759 diag::err_redefinition_different_kind; 4760 Diag(AliasLoc, DiagID) << Alias; 4761 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4762 return 0; 4763 } 4764 4765 if (R.isAmbiguous()) 4766 return 0; 4767 4768 if (R.empty()) { 4769 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4770 CTC_NoKeywords, 0)) { 4771 if (R.getAsSingle<NamespaceDecl>() || 4772 R.getAsSingle<NamespaceAliasDecl>()) { 4773 if (DeclContext *DC = computeDeclContext(SS, false)) 4774 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4775 << Ident << DC << Corrected << SS.getRange() 4776 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4777 else 4778 Diag(IdentLoc, diag::err_using_directive_suggest) 4779 << Ident << Corrected 4780 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4781 4782 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4783 << Corrected; 4784 4785 Ident = Corrected.getAsIdentifierInfo(); 4786 } else { 4787 R.clear(); 4788 R.setLookupName(Ident); 4789 } 4790 } 4791 4792 if (R.empty()) { 4793 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4794 return 0; 4795 } 4796 } 4797 4798 NamespaceAliasDecl *AliasDecl = 4799 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4800 Alias, SS.getWithLocInContext(Context), 4801 IdentLoc, R.getFoundDecl()); 4802 4803 PushOnScopeChains(AliasDecl, S); 4804 return AliasDecl; 4805} 4806 4807namespace { 4808 /// \brief Scoped object used to handle the state changes required in Sema 4809 /// to implicitly define the body of a C++ member function; 4810 class ImplicitlyDefinedFunctionScope { 4811 Sema &S; 4812 Sema::ContextRAII SavedContext; 4813 4814 public: 4815 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4816 : S(S), SavedContext(S, Method) 4817 { 4818 S.PushFunctionScope(); 4819 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4820 } 4821 4822 ~ImplicitlyDefinedFunctionScope() { 4823 S.PopExpressionEvaluationContext(); 4824 S.PopFunctionOrBlockScope(); 4825 } 4826 }; 4827} 4828 4829static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4830 CXXRecordDecl *D) { 4831 ASTContext &Context = Self.Context; 4832 QualType ClassType = Context.getTypeDeclType(D); 4833 DeclarationName ConstructorName 4834 = Context.DeclarationNames.getCXXConstructorName( 4835 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4836 4837 DeclContext::lookup_const_iterator Con, ConEnd; 4838 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4839 Con != ConEnd; ++Con) { 4840 // FIXME: In C++0x, a constructor template can be a default constructor. 4841 if (isa<FunctionTemplateDecl>(*Con)) 4842 continue; 4843 4844 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4845 if (Constructor->isDefaultConstructor()) 4846 return Constructor; 4847 } 4848 return 0; 4849} 4850 4851CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4852 CXXRecordDecl *ClassDecl) { 4853 // C++ [class.ctor]p5: 4854 // A default constructor for a class X is a constructor of class X 4855 // that can be called without an argument. If there is no 4856 // user-declared constructor for class X, a default constructor is 4857 // implicitly declared. An implicitly-declared default constructor 4858 // is an inline public member of its class. 4859 assert(!ClassDecl->hasUserDeclaredConstructor() && 4860 "Should not build implicit default constructor!"); 4861 4862 // C++ [except.spec]p14: 4863 // An implicitly declared special member function (Clause 12) shall have an 4864 // exception-specification. [...] 4865 ImplicitExceptionSpecification ExceptSpec(Context); 4866 4867 // Direct base-class constructors. 4868 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4869 BEnd = ClassDecl->bases_end(); 4870 B != BEnd; ++B) { 4871 if (B->isVirtual()) // Handled below. 4872 continue; 4873 4874 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4875 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4876 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4877 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4878 else if (CXXConstructorDecl *Constructor 4879 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4880 ExceptSpec.CalledDecl(Constructor); 4881 } 4882 } 4883 4884 // Virtual base-class constructors. 4885 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4886 BEnd = ClassDecl->vbases_end(); 4887 B != BEnd; ++B) { 4888 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4889 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4890 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4891 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4892 else if (CXXConstructorDecl *Constructor 4893 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4894 ExceptSpec.CalledDecl(Constructor); 4895 } 4896 } 4897 4898 // Field constructors. 4899 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4900 FEnd = ClassDecl->field_end(); 4901 F != FEnd; ++F) { 4902 if (const RecordType *RecordTy 4903 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4904 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4905 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4906 ExceptSpec.CalledDecl( 4907 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4908 else if (CXXConstructorDecl *Constructor 4909 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4910 ExceptSpec.CalledDecl(Constructor); 4911 } 4912 } 4913 4914 FunctionProtoType::ExtProtoInfo EPI; 4915 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4916 EPI.NumExceptions = ExceptSpec.size(); 4917 EPI.Exceptions = ExceptSpec.data(); 4918 4919 // Create the actual constructor declaration. 4920 CanQualType ClassType 4921 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4922 SourceLocation ClassLoc = ClassDecl->getLocation(); 4923 DeclarationName Name 4924 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4925 DeclarationNameInfo NameInfo(Name, ClassLoc); 4926 CXXConstructorDecl *DefaultCon 4927 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4928 Context.getFunctionType(Context.VoidTy, 4929 0, 0, EPI), 4930 /*TInfo=*/0, 4931 /*isExplicit=*/false, 4932 /*isInline=*/true, 4933 /*isImplicitlyDeclared=*/true); 4934 DefaultCon->setAccess(AS_public); 4935 DefaultCon->setImplicit(); 4936 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4937 4938 // Note that we have declared this constructor. 4939 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4940 4941 if (Scope *S = getScopeForContext(ClassDecl)) 4942 PushOnScopeChains(DefaultCon, S, false); 4943 ClassDecl->addDecl(DefaultCon); 4944 4945 return DefaultCon; 4946} 4947 4948void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4949 CXXConstructorDecl *Constructor) { 4950 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4951 !Constructor->isUsed(false)) && 4952 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4953 4954 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4955 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4956 4957 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4958 DiagnosticErrorTrap Trap(Diags); 4959 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4960 Trap.hasErrorOccurred()) { 4961 Diag(CurrentLocation, diag::note_member_synthesized_at) 4962 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4963 Constructor->setInvalidDecl(); 4964 return; 4965 } 4966 4967 SourceLocation Loc = Constructor->getLocation(); 4968 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4969 4970 Constructor->setUsed(); 4971 MarkVTableUsed(CurrentLocation, ClassDecl); 4972} 4973 4974void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 4975 // We start with an initial pass over the base classes to collect those that 4976 // inherit constructors from. If there are none, we can forgo all further 4977 // processing. 4978 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 4979 BasesVector BasesToInheritFrom; 4980 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 4981 BaseE = ClassDecl->bases_end(); 4982 BaseIt != BaseE; ++BaseIt) { 4983 if (BaseIt->getInheritConstructors()) { 4984 QualType Base = BaseIt->getType(); 4985 if (Base->isDependentType()) { 4986 // If we inherit constructors from anything that is dependent, just 4987 // abort processing altogether. We'll get another chance for the 4988 // instantiations. 4989 return; 4990 } 4991 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 4992 } 4993 } 4994 if (BasesToInheritFrom.empty()) 4995 return; 4996 4997 // Now collect the constructors that we already have in the current class. 4998 // Those take precedence over inherited constructors. 4999 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5000 // unless there is a user-declared constructor with the same signature in 5001 // the class where the using-declaration appears. 5002 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5003 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5004 CtorE = ClassDecl->ctor_end(); 5005 CtorIt != CtorE; ++CtorIt) { 5006 ExistingConstructors.insert( 5007 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5008 } 5009 5010 Scope *S = getScopeForContext(ClassDecl); 5011 DeclarationName CreatedCtorName = 5012 Context.DeclarationNames.getCXXConstructorName( 5013 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5014 5015 // Now comes the true work. 5016 // First, we keep a map from constructor types to the base that introduced 5017 // them. Needed for finding conflicting constructors. We also keep the 5018 // actually inserted declarations in there, for pretty diagnostics. 5019 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5020 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5021 ConstructorToSourceMap InheritedConstructors; 5022 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5023 BaseE = BasesToInheritFrom.end(); 5024 BaseIt != BaseE; ++BaseIt) { 5025 const RecordType *Base = *BaseIt; 5026 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5027 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5028 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5029 CtorE = BaseDecl->ctor_end(); 5030 CtorIt != CtorE; ++CtorIt) { 5031 // Find the using declaration for inheriting this base's constructors. 5032 DeclarationName Name = 5033 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5034 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5035 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5036 SourceLocation UsingLoc = UD ? UD->getLocation() : 5037 ClassDecl->getLocation(); 5038 5039 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5040 // from the class X named in the using-declaration consists of actual 5041 // constructors and notional constructors that result from the 5042 // transformation of defaulted parameters as follows: 5043 // - all non-template default constructors of X, and 5044 // - for each non-template constructor of X that has at least one 5045 // parameter with a default argument, the set of constructors that 5046 // results from omitting any ellipsis parameter specification and 5047 // successively omitting parameters with a default argument from the 5048 // end of the parameter-type-list. 5049 CXXConstructorDecl *BaseCtor = *CtorIt; 5050 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5051 const FunctionProtoType *BaseCtorType = 5052 BaseCtor->getType()->getAs<FunctionProtoType>(); 5053 5054 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5055 maxParams = BaseCtor->getNumParams(); 5056 params <= maxParams; ++params) { 5057 // Skip default constructors. They're never inherited. 5058 if (params == 0) 5059 continue; 5060 // Skip copy and move constructors for the same reason. 5061 if (CanBeCopyOrMove && params == 1) 5062 continue; 5063 5064 // Build up a function type for this particular constructor. 5065 // FIXME: The working paper does not consider that the exception spec 5066 // for the inheriting constructor might be larger than that of the 5067 // source. This code doesn't yet, either. 5068 const Type *NewCtorType; 5069 if (params == maxParams) 5070 NewCtorType = BaseCtorType; 5071 else { 5072 llvm::SmallVector<QualType, 16> Args; 5073 for (unsigned i = 0; i < params; ++i) { 5074 Args.push_back(BaseCtorType->getArgType(i)); 5075 } 5076 FunctionProtoType::ExtProtoInfo ExtInfo = 5077 BaseCtorType->getExtProtoInfo(); 5078 ExtInfo.Variadic = false; 5079 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5080 Args.data(), params, ExtInfo) 5081 .getTypePtr(); 5082 } 5083 const Type *CanonicalNewCtorType = 5084 Context.getCanonicalType(NewCtorType); 5085 5086 // Now that we have the type, first check if the class already has a 5087 // constructor with this signature. 5088 if (ExistingConstructors.count(CanonicalNewCtorType)) 5089 continue; 5090 5091 // Then we check if we have already declared an inherited constructor 5092 // with this signature. 5093 std::pair<ConstructorToSourceMap::iterator, bool> result = 5094 InheritedConstructors.insert(std::make_pair( 5095 CanonicalNewCtorType, 5096 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5097 if (!result.second) { 5098 // Already in the map. If it came from a different class, that's an 5099 // error. Not if it's from the same. 5100 CanQualType PreviousBase = result.first->second.first; 5101 if (CanonicalBase != PreviousBase) { 5102 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5103 const CXXConstructorDecl *PrevBaseCtor = 5104 PrevCtor->getInheritedConstructor(); 5105 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5106 5107 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5108 Diag(BaseCtor->getLocation(), 5109 diag::note_using_decl_constructor_conflict_current_ctor); 5110 Diag(PrevBaseCtor->getLocation(), 5111 diag::note_using_decl_constructor_conflict_previous_ctor); 5112 Diag(PrevCtor->getLocation(), 5113 diag::note_using_decl_constructor_conflict_previous_using); 5114 } 5115 continue; 5116 } 5117 5118 // OK, we're there, now add the constructor. 5119 // C++0x [class.inhctor]p8: [...] that would be performed by a 5120 // user-writtern inline constructor [...] 5121 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5122 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5123 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5124 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5125 /*ImplicitlyDeclared=*/true); 5126 NewCtor->setAccess(BaseCtor->getAccess()); 5127 5128 // Build up the parameter decls and add them. 5129 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5130 for (unsigned i = 0; i < params; ++i) { 5131 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5132 UsingLoc, UsingLoc, 5133 /*IdentifierInfo=*/0, 5134 BaseCtorType->getArgType(i), 5135 /*TInfo=*/0, SC_None, 5136 SC_None, /*DefaultArg=*/0)); 5137 } 5138 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5139 NewCtor->setInheritedConstructor(BaseCtor); 5140 5141 PushOnScopeChains(NewCtor, S, false); 5142 ClassDecl->addDecl(NewCtor); 5143 result.first->second.second = NewCtor; 5144 } 5145 } 5146 } 5147} 5148 5149CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5150 // C++ [class.dtor]p2: 5151 // If a class has no user-declared destructor, a destructor is 5152 // declared implicitly. An implicitly-declared destructor is an 5153 // inline public member of its class. 5154 5155 // C++ [except.spec]p14: 5156 // An implicitly declared special member function (Clause 12) shall have 5157 // an exception-specification. 5158 ImplicitExceptionSpecification ExceptSpec(Context); 5159 5160 // Direct base-class destructors. 5161 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5162 BEnd = ClassDecl->bases_end(); 5163 B != BEnd; ++B) { 5164 if (B->isVirtual()) // Handled below. 5165 continue; 5166 5167 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5168 ExceptSpec.CalledDecl( 5169 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5170 } 5171 5172 // Virtual base-class destructors. 5173 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5174 BEnd = ClassDecl->vbases_end(); 5175 B != BEnd; ++B) { 5176 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5177 ExceptSpec.CalledDecl( 5178 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5179 } 5180 5181 // Field destructors. 5182 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5183 FEnd = ClassDecl->field_end(); 5184 F != FEnd; ++F) { 5185 if (const RecordType *RecordTy 5186 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5187 ExceptSpec.CalledDecl( 5188 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5189 } 5190 5191 // Create the actual destructor declaration. 5192 FunctionProtoType::ExtProtoInfo EPI; 5193 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5194 EPI.NumExceptions = ExceptSpec.size(); 5195 EPI.Exceptions = ExceptSpec.data(); 5196 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5197 5198 CanQualType ClassType 5199 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5200 SourceLocation ClassLoc = ClassDecl->getLocation(); 5201 DeclarationName Name 5202 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5203 DeclarationNameInfo NameInfo(Name, ClassLoc); 5204 CXXDestructorDecl *Destructor 5205 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5206 /*isInline=*/true, 5207 /*isImplicitlyDeclared=*/true); 5208 Destructor->setAccess(AS_public); 5209 Destructor->setImplicit(); 5210 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5211 5212 // Note that we have declared this destructor. 5213 ++ASTContext::NumImplicitDestructorsDeclared; 5214 5215 // Introduce this destructor into its scope. 5216 if (Scope *S = getScopeForContext(ClassDecl)) 5217 PushOnScopeChains(Destructor, S, false); 5218 ClassDecl->addDecl(Destructor); 5219 5220 // This could be uniqued if it ever proves significant. 5221 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5222 5223 AddOverriddenMethods(ClassDecl, Destructor); 5224 5225 return Destructor; 5226} 5227 5228void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5229 CXXDestructorDecl *Destructor) { 5230 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5231 "DefineImplicitDestructor - call it for implicit default dtor"); 5232 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5233 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5234 5235 if (Destructor->isInvalidDecl()) 5236 return; 5237 5238 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5239 5240 DiagnosticErrorTrap Trap(Diags); 5241 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5242 Destructor->getParent()); 5243 5244 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5245 Diag(CurrentLocation, diag::note_member_synthesized_at) 5246 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5247 5248 Destructor->setInvalidDecl(); 5249 return; 5250 } 5251 5252 SourceLocation Loc = Destructor->getLocation(); 5253 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5254 5255 Destructor->setUsed(); 5256 MarkVTableUsed(CurrentLocation, ClassDecl); 5257} 5258 5259/// \brief Builds a statement that copies the given entity from \p From to 5260/// \c To. 5261/// 5262/// This routine is used to copy the members of a class with an 5263/// implicitly-declared copy assignment operator. When the entities being 5264/// copied are arrays, this routine builds for loops to copy them. 5265/// 5266/// \param S The Sema object used for type-checking. 5267/// 5268/// \param Loc The location where the implicit copy is being generated. 5269/// 5270/// \param T The type of the expressions being copied. Both expressions must 5271/// have this type. 5272/// 5273/// \param To The expression we are copying to. 5274/// 5275/// \param From The expression we are copying from. 5276/// 5277/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5278/// Otherwise, it's a non-static member subobject. 5279/// 5280/// \param Depth Internal parameter recording the depth of the recursion. 5281/// 5282/// \returns A statement or a loop that copies the expressions. 5283static StmtResult 5284BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5285 Expr *To, Expr *From, 5286 bool CopyingBaseSubobject, unsigned Depth = 0) { 5287 // C++0x [class.copy]p30: 5288 // Each subobject is assigned in the manner appropriate to its type: 5289 // 5290 // - if the subobject is of class type, the copy assignment operator 5291 // for the class is used (as if by explicit qualification; that is, 5292 // ignoring any possible virtual overriding functions in more derived 5293 // classes); 5294 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5295 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5296 5297 // Look for operator=. 5298 DeclarationName Name 5299 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5300 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5301 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5302 5303 // Filter out any result that isn't a copy-assignment operator. 5304 LookupResult::Filter F = OpLookup.makeFilter(); 5305 while (F.hasNext()) { 5306 NamedDecl *D = F.next(); 5307 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5308 if (Method->isCopyAssignmentOperator()) 5309 continue; 5310 5311 F.erase(); 5312 } 5313 F.done(); 5314 5315 // Suppress the protected check (C++ [class.protected]) for each of the 5316 // assignment operators we found. This strange dance is required when 5317 // we're assigning via a base classes's copy-assignment operator. To 5318 // ensure that we're getting the right base class subobject (without 5319 // ambiguities), we need to cast "this" to that subobject type; to 5320 // ensure that we don't go through the virtual call mechanism, we need 5321 // to qualify the operator= name with the base class (see below). However, 5322 // this means that if the base class has a protected copy assignment 5323 // operator, the protected member access check will fail. So, we 5324 // rewrite "protected" access to "public" access in this case, since we 5325 // know by construction that we're calling from a derived class. 5326 if (CopyingBaseSubobject) { 5327 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5328 L != LEnd; ++L) { 5329 if (L.getAccess() == AS_protected) 5330 L.setAccess(AS_public); 5331 } 5332 } 5333 5334 // Create the nested-name-specifier that will be used to qualify the 5335 // reference to operator=; this is required to suppress the virtual 5336 // call mechanism. 5337 CXXScopeSpec SS; 5338 SS.MakeTrivial(S.Context, 5339 NestedNameSpecifier::Create(S.Context, 0, false, 5340 T.getTypePtr()), 5341 Loc); 5342 5343 // Create the reference to operator=. 5344 ExprResult OpEqualRef 5345 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5346 /*FirstQualifierInScope=*/0, OpLookup, 5347 /*TemplateArgs=*/0, 5348 /*SuppressQualifierCheck=*/true); 5349 if (OpEqualRef.isInvalid()) 5350 return StmtError(); 5351 5352 // Build the call to the assignment operator. 5353 5354 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5355 OpEqualRef.takeAs<Expr>(), 5356 Loc, &From, 1, Loc); 5357 if (Call.isInvalid()) 5358 return StmtError(); 5359 5360 return S.Owned(Call.takeAs<Stmt>()); 5361 } 5362 5363 // - if the subobject is of scalar type, the built-in assignment 5364 // operator is used. 5365 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5366 if (!ArrayTy) { 5367 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5368 if (Assignment.isInvalid()) 5369 return StmtError(); 5370 5371 return S.Owned(Assignment.takeAs<Stmt>()); 5372 } 5373 5374 // - if the subobject is an array, each element is assigned, in the 5375 // manner appropriate to the element type; 5376 5377 // Construct a loop over the array bounds, e.g., 5378 // 5379 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5380 // 5381 // that will copy each of the array elements. 5382 QualType SizeType = S.Context.getSizeType(); 5383 5384 // Create the iteration variable. 5385 IdentifierInfo *IterationVarName = 0; 5386 { 5387 llvm::SmallString<8> Str; 5388 llvm::raw_svector_ostream OS(Str); 5389 OS << "__i" << Depth; 5390 IterationVarName = &S.Context.Idents.get(OS.str()); 5391 } 5392 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5393 IterationVarName, SizeType, 5394 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5395 SC_None, SC_None); 5396 5397 // Initialize the iteration variable to zero. 5398 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5399 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5400 5401 // Create a reference to the iteration variable; we'll use this several 5402 // times throughout. 5403 Expr *IterationVarRef 5404 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5405 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5406 5407 // Create the DeclStmt that holds the iteration variable. 5408 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5409 5410 // Create the comparison against the array bound. 5411 llvm::APInt Upper 5412 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5413 Expr *Comparison 5414 = new (S.Context) BinaryOperator(IterationVarRef, 5415 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5416 BO_NE, S.Context.BoolTy, 5417 VK_RValue, OK_Ordinary, Loc); 5418 5419 // Create the pre-increment of the iteration variable. 5420 Expr *Increment 5421 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5422 VK_LValue, OK_Ordinary, Loc); 5423 5424 // Subscript the "from" and "to" expressions with the iteration variable. 5425 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5426 IterationVarRef, Loc)); 5427 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5428 IterationVarRef, Loc)); 5429 5430 // Build the copy for an individual element of the array. 5431 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5432 To, From, CopyingBaseSubobject, 5433 Depth + 1); 5434 if (Copy.isInvalid()) 5435 return StmtError(); 5436 5437 // Construct the loop that copies all elements of this array. 5438 return S.ActOnForStmt(Loc, Loc, InitStmt, 5439 S.MakeFullExpr(Comparison), 5440 0, S.MakeFullExpr(Increment), 5441 Loc, Copy.take()); 5442} 5443 5444/// \brief Determine whether the given class has a copy assignment operator 5445/// that accepts a const-qualified argument. 5446static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5447 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5448 5449 if (!Class->hasDeclaredCopyAssignment()) 5450 S.DeclareImplicitCopyAssignment(Class); 5451 5452 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5453 DeclarationName OpName 5454 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5455 5456 DeclContext::lookup_const_iterator Op, OpEnd; 5457 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5458 // C++ [class.copy]p9: 5459 // A user-declared copy assignment operator is a non-static non-template 5460 // member function of class X with exactly one parameter of type X, X&, 5461 // const X&, volatile X& or const volatile X&. 5462 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5463 if (!Method) 5464 continue; 5465 5466 if (Method->isStatic()) 5467 continue; 5468 if (Method->getPrimaryTemplate()) 5469 continue; 5470 const FunctionProtoType *FnType = 5471 Method->getType()->getAs<FunctionProtoType>(); 5472 assert(FnType && "Overloaded operator has no prototype."); 5473 // Don't assert on this; an invalid decl might have been left in the AST. 5474 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5475 continue; 5476 bool AcceptsConst = true; 5477 QualType ArgType = FnType->getArgType(0); 5478 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5479 ArgType = Ref->getPointeeType(); 5480 // Is it a non-const lvalue reference? 5481 if (!ArgType.isConstQualified()) 5482 AcceptsConst = false; 5483 } 5484 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5485 continue; 5486 5487 // We have a single argument of type cv X or cv X&, i.e. we've found the 5488 // copy assignment operator. Return whether it accepts const arguments. 5489 return AcceptsConst; 5490 } 5491 assert(Class->isInvalidDecl() && 5492 "No copy assignment operator declared in valid code."); 5493 return false; 5494} 5495 5496CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5497 // Note: The following rules are largely analoguous to the copy 5498 // constructor rules. Note that virtual bases are not taken into account 5499 // for determining the argument type of the operator. Note also that 5500 // operators taking an object instead of a reference are allowed. 5501 5502 5503 // C++ [class.copy]p10: 5504 // If the class definition does not explicitly declare a copy 5505 // assignment operator, one is declared implicitly. 5506 // The implicitly-defined copy assignment operator for a class X 5507 // will have the form 5508 // 5509 // X& X::operator=(const X&) 5510 // 5511 // if 5512 bool HasConstCopyAssignment = true; 5513 5514 // -- each direct base class B of X has a copy assignment operator 5515 // whose parameter is of type const B&, const volatile B& or B, 5516 // and 5517 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5518 BaseEnd = ClassDecl->bases_end(); 5519 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5520 assert(!Base->getType()->isDependentType() && 5521 "Cannot generate implicit members for class with dependent bases."); 5522 const CXXRecordDecl *BaseClassDecl 5523 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5524 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5525 } 5526 5527 // -- for all the nonstatic data members of X that are of a class 5528 // type M (or array thereof), each such class type has a copy 5529 // assignment operator whose parameter is of type const M&, 5530 // const volatile M& or M. 5531 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5532 FieldEnd = ClassDecl->field_end(); 5533 HasConstCopyAssignment && Field != FieldEnd; 5534 ++Field) { 5535 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5536 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5537 const CXXRecordDecl *FieldClassDecl 5538 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5539 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5540 } 5541 } 5542 5543 // Otherwise, the implicitly declared copy assignment operator will 5544 // have the form 5545 // 5546 // X& X::operator=(X&) 5547 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5548 QualType RetType = Context.getLValueReferenceType(ArgType); 5549 if (HasConstCopyAssignment) 5550 ArgType = ArgType.withConst(); 5551 ArgType = Context.getLValueReferenceType(ArgType); 5552 5553 // C++ [except.spec]p14: 5554 // An implicitly declared special member function (Clause 12) shall have an 5555 // exception-specification. [...] 5556 ImplicitExceptionSpecification ExceptSpec(Context); 5557 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5558 BaseEnd = ClassDecl->bases_end(); 5559 Base != BaseEnd; ++Base) { 5560 CXXRecordDecl *BaseClassDecl 5561 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5562 5563 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5564 DeclareImplicitCopyAssignment(BaseClassDecl); 5565 5566 if (CXXMethodDecl *CopyAssign 5567 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5568 ExceptSpec.CalledDecl(CopyAssign); 5569 } 5570 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5571 FieldEnd = ClassDecl->field_end(); 5572 Field != FieldEnd; 5573 ++Field) { 5574 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5575 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5576 CXXRecordDecl *FieldClassDecl 5577 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5578 5579 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5580 DeclareImplicitCopyAssignment(FieldClassDecl); 5581 5582 if (CXXMethodDecl *CopyAssign 5583 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5584 ExceptSpec.CalledDecl(CopyAssign); 5585 } 5586 } 5587 5588 // An implicitly-declared copy assignment operator is an inline public 5589 // member of its class. 5590 FunctionProtoType::ExtProtoInfo EPI; 5591 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5592 EPI.NumExceptions = ExceptSpec.size(); 5593 EPI.Exceptions = ExceptSpec.data(); 5594 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5595 SourceLocation ClassLoc = ClassDecl->getLocation(); 5596 DeclarationNameInfo NameInfo(Name, ClassLoc); 5597 CXXMethodDecl *CopyAssignment 5598 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5599 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5600 /*TInfo=*/0, /*isStatic=*/false, 5601 /*StorageClassAsWritten=*/SC_None, 5602 /*isInline=*/true, 5603 SourceLocation()); 5604 CopyAssignment->setAccess(AS_public); 5605 CopyAssignment->setImplicit(); 5606 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5607 5608 // Add the parameter to the operator. 5609 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5610 ClassLoc, ClassLoc, /*Id=*/0, 5611 ArgType, /*TInfo=*/0, 5612 SC_None, 5613 SC_None, 0); 5614 CopyAssignment->setParams(&FromParam, 1); 5615 5616 // Note that we have added this copy-assignment operator. 5617 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5618 5619 if (Scope *S = getScopeForContext(ClassDecl)) 5620 PushOnScopeChains(CopyAssignment, S, false); 5621 ClassDecl->addDecl(CopyAssignment); 5622 5623 AddOverriddenMethods(ClassDecl, CopyAssignment); 5624 return CopyAssignment; 5625} 5626 5627void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5628 CXXMethodDecl *CopyAssignOperator) { 5629 assert((CopyAssignOperator->isImplicit() && 5630 CopyAssignOperator->isOverloadedOperator() && 5631 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5632 !CopyAssignOperator->isUsed(false)) && 5633 "DefineImplicitCopyAssignment called for wrong function"); 5634 5635 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5636 5637 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5638 CopyAssignOperator->setInvalidDecl(); 5639 return; 5640 } 5641 5642 CopyAssignOperator->setUsed(); 5643 5644 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5645 DiagnosticErrorTrap Trap(Diags); 5646 5647 // C++0x [class.copy]p30: 5648 // The implicitly-defined or explicitly-defaulted copy assignment operator 5649 // for a non-union class X performs memberwise copy assignment of its 5650 // subobjects. The direct base classes of X are assigned first, in the 5651 // order of their declaration in the base-specifier-list, and then the 5652 // immediate non-static data members of X are assigned, in the order in 5653 // which they were declared in the class definition. 5654 5655 // The statements that form the synthesized function body. 5656 ASTOwningVector<Stmt*> Statements(*this); 5657 5658 // The parameter for the "other" object, which we are copying from. 5659 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5660 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5661 QualType OtherRefType = Other->getType(); 5662 if (const LValueReferenceType *OtherRef 5663 = OtherRefType->getAs<LValueReferenceType>()) { 5664 OtherRefType = OtherRef->getPointeeType(); 5665 OtherQuals = OtherRefType.getQualifiers(); 5666 } 5667 5668 // Our location for everything implicitly-generated. 5669 SourceLocation Loc = CopyAssignOperator->getLocation(); 5670 5671 // Construct a reference to the "other" object. We'll be using this 5672 // throughout the generated ASTs. 5673 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5674 assert(OtherRef && "Reference to parameter cannot fail!"); 5675 5676 // Construct the "this" pointer. We'll be using this throughout the generated 5677 // ASTs. 5678 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5679 assert(This && "Reference to this cannot fail!"); 5680 5681 // Assign base classes. 5682 bool Invalid = false; 5683 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5684 E = ClassDecl->bases_end(); Base != E; ++Base) { 5685 // Form the assignment: 5686 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5687 QualType BaseType = Base->getType().getUnqualifiedType(); 5688 if (!BaseType->isRecordType()) { 5689 Invalid = true; 5690 continue; 5691 } 5692 5693 CXXCastPath BasePath; 5694 BasePath.push_back(Base); 5695 5696 // Construct the "from" expression, which is an implicit cast to the 5697 // appropriately-qualified base type. 5698 Expr *From = OtherRef; 5699 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5700 CK_UncheckedDerivedToBase, 5701 VK_LValue, &BasePath).take(); 5702 5703 // Dereference "this". 5704 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5705 5706 // Implicitly cast "this" to the appropriately-qualified base type. 5707 To = ImpCastExprToType(To.take(), 5708 Context.getCVRQualifiedType(BaseType, 5709 CopyAssignOperator->getTypeQualifiers()), 5710 CK_UncheckedDerivedToBase, 5711 VK_LValue, &BasePath); 5712 5713 // Build the copy. 5714 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5715 To.get(), From, 5716 /*CopyingBaseSubobject=*/true); 5717 if (Copy.isInvalid()) { 5718 Diag(CurrentLocation, diag::note_member_synthesized_at) 5719 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5720 CopyAssignOperator->setInvalidDecl(); 5721 return; 5722 } 5723 5724 // Success! Record the copy. 5725 Statements.push_back(Copy.takeAs<Expr>()); 5726 } 5727 5728 // \brief Reference to the __builtin_memcpy function. 5729 Expr *BuiltinMemCpyRef = 0; 5730 // \brief Reference to the __builtin_objc_memmove_collectable function. 5731 Expr *CollectableMemCpyRef = 0; 5732 5733 // Assign non-static members. 5734 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5735 FieldEnd = ClassDecl->field_end(); 5736 Field != FieldEnd; ++Field) { 5737 // Check for members of reference type; we can't copy those. 5738 if (Field->getType()->isReferenceType()) { 5739 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5740 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5741 Diag(Field->getLocation(), diag::note_declared_at); 5742 Diag(CurrentLocation, diag::note_member_synthesized_at) 5743 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5744 Invalid = true; 5745 continue; 5746 } 5747 5748 // Check for members of const-qualified, non-class type. 5749 QualType BaseType = Context.getBaseElementType(Field->getType()); 5750 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5751 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5752 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5753 Diag(Field->getLocation(), diag::note_declared_at); 5754 Diag(CurrentLocation, diag::note_member_synthesized_at) 5755 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5756 Invalid = true; 5757 continue; 5758 } 5759 5760 QualType FieldType = Field->getType().getNonReferenceType(); 5761 if (FieldType->isIncompleteArrayType()) { 5762 assert(ClassDecl->hasFlexibleArrayMember() && 5763 "Incomplete array type is not valid"); 5764 continue; 5765 } 5766 5767 // Build references to the field in the object we're copying from and to. 5768 CXXScopeSpec SS; // Intentionally empty 5769 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5770 LookupMemberName); 5771 MemberLookup.addDecl(*Field); 5772 MemberLookup.resolveKind(); 5773 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5774 Loc, /*IsArrow=*/false, 5775 SS, 0, MemberLookup, 0); 5776 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5777 Loc, /*IsArrow=*/true, 5778 SS, 0, MemberLookup, 0); 5779 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5780 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5781 5782 // If the field should be copied with __builtin_memcpy rather than via 5783 // explicit assignments, do so. This optimization only applies for arrays 5784 // of scalars and arrays of class type with trivial copy-assignment 5785 // operators. 5786 if (FieldType->isArrayType() && 5787 (!BaseType->isRecordType() || 5788 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5789 ->hasTrivialCopyAssignment())) { 5790 // Compute the size of the memory buffer to be copied. 5791 QualType SizeType = Context.getSizeType(); 5792 llvm::APInt Size(Context.getTypeSize(SizeType), 5793 Context.getTypeSizeInChars(BaseType).getQuantity()); 5794 for (const ConstantArrayType *Array 5795 = Context.getAsConstantArrayType(FieldType); 5796 Array; 5797 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5798 llvm::APInt ArraySize 5799 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5800 Size *= ArraySize; 5801 } 5802 5803 // Take the address of the field references for "from" and "to". 5804 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5805 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5806 5807 bool NeedsCollectableMemCpy = 5808 (BaseType->isRecordType() && 5809 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5810 5811 if (NeedsCollectableMemCpy) { 5812 if (!CollectableMemCpyRef) { 5813 // Create a reference to the __builtin_objc_memmove_collectable function. 5814 LookupResult R(*this, 5815 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5816 Loc, LookupOrdinaryName); 5817 LookupName(R, TUScope, true); 5818 5819 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5820 if (!CollectableMemCpy) { 5821 // Something went horribly wrong earlier, and we will have 5822 // complained about it. 5823 Invalid = true; 5824 continue; 5825 } 5826 5827 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5828 CollectableMemCpy->getType(), 5829 VK_LValue, Loc, 0).take(); 5830 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5831 } 5832 } 5833 // Create a reference to the __builtin_memcpy builtin function. 5834 else if (!BuiltinMemCpyRef) { 5835 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5836 LookupOrdinaryName); 5837 LookupName(R, TUScope, true); 5838 5839 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5840 if (!BuiltinMemCpy) { 5841 // Something went horribly wrong earlier, and we will have complained 5842 // about it. 5843 Invalid = true; 5844 continue; 5845 } 5846 5847 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5848 BuiltinMemCpy->getType(), 5849 VK_LValue, Loc, 0).take(); 5850 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5851 } 5852 5853 ASTOwningVector<Expr*> CallArgs(*this); 5854 CallArgs.push_back(To.takeAs<Expr>()); 5855 CallArgs.push_back(From.takeAs<Expr>()); 5856 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5857 ExprResult Call = ExprError(); 5858 if (NeedsCollectableMemCpy) 5859 Call = ActOnCallExpr(/*Scope=*/0, 5860 CollectableMemCpyRef, 5861 Loc, move_arg(CallArgs), 5862 Loc); 5863 else 5864 Call = ActOnCallExpr(/*Scope=*/0, 5865 BuiltinMemCpyRef, 5866 Loc, move_arg(CallArgs), 5867 Loc); 5868 5869 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5870 Statements.push_back(Call.takeAs<Expr>()); 5871 continue; 5872 } 5873 5874 // Build the copy of this field. 5875 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5876 To.get(), From.get(), 5877 /*CopyingBaseSubobject=*/false); 5878 if (Copy.isInvalid()) { 5879 Diag(CurrentLocation, diag::note_member_synthesized_at) 5880 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5881 CopyAssignOperator->setInvalidDecl(); 5882 return; 5883 } 5884 5885 // Success! Record the copy. 5886 Statements.push_back(Copy.takeAs<Stmt>()); 5887 } 5888 5889 if (!Invalid) { 5890 // Add a "return *this;" 5891 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5892 5893 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5894 if (Return.isInvalid()) 5895 Invalid = true; 5896 else { 5897 Statements.push_back(Return.takeAs<Stmt>()); 5898 5899 if (Trap.hasErrorOccurred()) { 5900 Diag(CurrentLocation, diag::note_member_synthesized_at) 5901 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5902 Invalid = true; 5903 } 5904 } 5905 } 5906 5907 if (Invalid) { 5908 CopyAssignOperator->setInvalidDecl(); 5909 return; 5910 } 5911 5912 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5913 /*isStmtExpr=*/false); 5914 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5915 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5916} 5917 5918CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5919 CXXRecordDecl *ClassDecl) { 5920 // C++ [class.copy]p4: 5921 // If the class definition does not explicitly declare a copy 5922 // constructor, one is declared implicitly. 5923 5924 // C++ [class.copy]p5: 5925 // The implicitly-declared copy constructor for a class X will 5926 // have the form 5927 // 5928 // X::X(const X&) 5929 // 5930 // if 5931 bool HasConstCopyConstructor = true; 5932 5933 // -- each direct or virtual base class B of X has a copy 5934 // constructor whose first parameter is of type const B& or 5935 // const volatile B&, and 5936 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5937 BaseEnd = ClassDecl->bases_end(); 5938 HasConstCopyConstructor && Base != BaseEnd; 5939 ++Base) { 5940 // Virtual bases are handled below. 5941 if (Base->isVirtual()) 5942 continue; 5943 5944 CXXRecordDecl *BaseClassDecl 5945 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5946 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5947 DeclareImplicitCopyConstructor(BaseClassDecl); 5948 5949 HasConstCopyConstructor 5950 = BaseClassDecl->hasConstCopyConstructor(Context); 5951 } 5952 5953 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5954 BaseEnd = ClassDecl->vbases_end(); 5955 HasConstCopyConstructor && Base != BaseEnd; 5956 ++Base) { 5957 CXXRecordDecl *BaseClassDecl 5958 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5959 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5960 DeclareImplicitCopyConstructor(BaseClassDecl); 5961 5962 HasConstCopyConstructor 5963 = BaseClassDecl->hasConstCopyConstructor(Context); 5964 } 5965 5966 // -- for all the nonstatic data members of X that are of a 5967 // class type M (or array thereof), each such class type 5968 // has a copy constructor whose first parameter is of type 5969 // const M& or const volatile M&. 5970 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5971 FieldEnd = ClassDecl->field_end(); 5972 HasConstCopyConstructor && Field != FieldEnd; 5973 ++Field) { 5974 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5975 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5976 CXXRecordDecl *FieldClassDecl 5977 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5978 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5979 DeclareImplicitCopyConstructor(FieldClassDecl); 5980 5981 HasConstCopyConstructor 5982 = FieldClassDecl->hasConstCopyConstructor(Context); 5983 } 5984 } 5985 5986 // Otherwise, the implicitly declared copy constructor will have 5987 // the form 5988 // 5989 // X::X(X&) 5990 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5991 QualType ArgType = ClassType; 5992 if (HasConstCopyConstructor) 5993 ArgType = ArgType.withConst(); 5994 ArgType = Context.getLValueReferenceType(ArgType); 5995 5996 // C++ [except.spec]p14: 5997 // An implicitly declared special member function (Clause 12) shall have an 5998 // exception-specification. [...] 5999 ImplicitExceptionSpecification ExceptSpec(Context); 6000 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6001 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6002 BaseEnd = ClassDecl->bases_end(); 6003 Base != BaseEnd; 6004 ++Base) { 6005 // Virtual bases are handled below. 6006 if (Base->isVirtual()) 6007 continue; 6008 6009 CXXRecordDecl *BaseClassDecl 6010 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6011 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6012 DeclareImplicitCopyConstructor(BaseClassDecl); 6013 6014 if (CXXConstructorDecl *CopyConstructor 6015 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6016 ExceptSpec.CalledDecl(CopyConstructor); 6017 } 6018 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6019 BaseEnd = ClassDecl->vbases_end(); 6020 Base != BaseEnd; 6021 ++Base) { 6022 CXXRecordDecl *BaseClassDecl 6023 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6024 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6025 DeclareImplicitCopyConstructor(BaseClassDecl); 6026 6027 if (CXXConstructorDecl *CopyConstructor 6028 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6029 ExceptSpec.CalledDecl(CopyConstructor); 6030 } 6031 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6032 FieldEnd = ClassDecl->field_end(); 6033 Field != FieldEnd; 6034 ++Field) { 6035 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6036 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6037 CXXRecordDecl *FieldClassDecl 6038 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6039 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6040 DeclareImplicitCopyConstructor(FieldClassDecl); 6041 6042 if (CXXConstructorDecl *CopyConstructor 6043 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6044 ExceptSpec.CalledDecl(CopyConstructor); 6045 } 6046 } 6047 6048 // An implicitly-declared copy constructor is an inline public 6049 // member of its class. 6050 FunctionProtoType::ExtProtoInfo EPI; 6051 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6052 EPI.NumExceptions = ExceptSpec.size(); 6053 EPI.Exceptions = ExceptSpec.data(); 6054 DeclarationName Name 6055 = Context.DeclarationNames.getCXXConstructorName( 6056 Context.getCanonicalType(ClassType)); 6057 SourceLocation ClassLoc = ClassDecl->getLocation(); 6058 DeclarationNameInfo NameInfo(Name, ClassLoc); 6059 CXXConstructorDecl *CopyConstructor 6060 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6061 Context.getFunctionType(Context.VoidTy, 6062 &ArgType, 1, EPI), 6063 /*TInfo=*/0, 6064 /*isExplicit=*/false, 6065 /*isInline=*/true, 6066 /*isImplicitlyDeclared=*/true); 6067 CopyConstructor->setAccess(AS_public); 6068 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6069 6070 // Note that we have declared this constructor. 6071 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6072 6073 // Add the parameter to the constructor. 6074 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6075 ClassLoc, ClassLoc, 6076 /*IdentifierInfo=*/0, 6077 ArgType, /*TInfo=*/0, 6078 SC_None, 6079 SC_None, 0); 6080 CopyConstructor->setParams(&FromParam, 1); 6081 if (Scope *S = getScopeForContext(ClassDecl)) 6082 PushOnScopeChains(CopyConstructor, S, false); 6083 ClassDecl->addDecl(CopyConstructor); 6084 6085 return CopyConstructor; 6086} 6087 6088void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6089 CXXConstructorDecl *CopyConstructor, 6090 unsigned TypeQuals) { 6091 assert((CopyConstructor->isImplicit() && 6092 CopyConstructor->isCopyConstructor(TypeQuals) && 6093 !CopyConstructor->isUsed(false)) && 6094 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6095 6096 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6097 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6098 6099 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6100 DiagnosticErrorTrap Trap(Diags); 6101 6102 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6103 Trap.hasErrorOccurred()) { 6104 Diag(CurrentLocation, diag::note_member_synthesized_at) 6105 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6106 CopyConstructor->setInvalidDecl(); 6107 } else { 6108 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6109 CopyConstructor->getLocation(), 6110 MultiStmtArg(*this, 0, 0), 6111 /*isStmtExpr=*/false) 6112 .takeAs<Stmt>()); 6113 } 6114 6115 CopyConstructor->setUsed(); 6116} 6117 6118ExprResult 6119Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6120 CXXConstructorDecl *Constructor, 6121 MultiExprArg ExprArgs, 6122 bool RequiresZeroInit, 6123 unsigned ConstructKind, 6124 SourceRange ParenRange) { 6125 bool Elidable = false; 6126 6127 // C++0x [class.copy]p34: 6128 // When certain criteria are met, an implementation is allowed to 6129 // omit the copy/move construction of a class object, even if the 6130 // copy/move constructor and/or destructor for the object have 6131 // side effects. [...] 6132 // - when a temporary class object that has not been bound to a 6133 // reference (12.2) would be copied/moved to a class object 6134 // with the same cv-unqualified type, the copy/move operation 6135 // can be omitted by constructing the temporary object 6136 // directly into the target of the omitted copy/move 6137 if (ConstructKind == CXXConstructExpr::CK_Complete && 6138 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6139 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6140 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6141 } 6142 6143 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6144 Elidable, move(ExprArgs), RequiresZeroInit, 6145 ConstructKind, ParenRange); 6146} 6147 6148/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6149/// including handling of its default argument expressions. 6150ExprResult 6151Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6152 CXXConstructorDecl *Constructor, bool Elidable, 6153 MultiExprArg ExprArgs, 6154 bool RequiresZeroInit, 6155 unsigned ConstructKind, 6156 SourceRange ParenRange) { 6157 unsigned NumExprs = ExprArgs.size(); 6158 Expr **Exprs = (Expr **)ExprArgs.release(); 6159 6160 for (specific_attr_iterator<NonNullAttr> 6161 i = Constructor->specific_attr_begin<NonNullAttr>(), 6162 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6163 const NonNullAttr *NonNull = *i; 6164 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6165 } 6166 6167 MarkDeclarationReferenced(ConstructLoc, Constructor); 6168 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6169 Constructor, Elidable, Exprs, NumExprs, 6170 RequiresZeroInit, 6171 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6172 ParenRange)); 6173} 6174 6175bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6176 CXXConstructorDecl *Constructor, 6177 MultiExprArg Exprs) { 6178 // FIXME: Provide the correct paren SourceRange when available. 6179 ExprResult TempResult = 6180 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6181 move(Exprs), false, CXXConstructExpr::CK_Complete, 6182 SourceRange()); 6183 if (TempResult.isInvalid()) 6184 return true; 6185 6186 Expr *Temp = TempResult.takeAs<Expr>(); 6187 CheckImplicitConversions(Temp, VD->getLocation()); 6188 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6189 Temp = MaybeCreateExprWithCleanups(Temp); 6190 VD->setInit(Temp); 6191 6192 return false; 6193} 6194 6195void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6196 if (VD->isInvalidDecl()) return; 6197 6198 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6199 if (ClassDecl->isInvalidDecl()) return; 6200 if (ClassDecl->hasTrivialDestructor()) return; 6201 if (ClassDecl->isDependentContext()) return; 6202 6203 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6204 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6205 CheckDestructorAccess(VD->getLocation(), Destructor, 6206 PDiag(diag::err_access_dtor_var) 6207 << VD->getDeclName() 6208 << VD->getType()); 6209 6210 if (!VD->hasGlobalStorage()) return; 6211 6212 // Emit warning for non-trivial dtor in global scope (a real global, 6213 // class-static, function-static). 6214 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6215 6216 // TODO: this should be re-enabled for static locals by !CXAAtExit 6217 if (!VD->isStaticLocal()) 6218 Diag(VD->getLocation(), diag::warn_global_destructor); 6219} 6220 6221/// AddCXXDirectInitializerToDecl - This action is called immediately after 6222/// ActOnDeclarator, when a C++ direct initializer is present. 6223/// e.g: "int x(1);" 6224void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6225 SourceLocation LParenLoc, 6226 MultiExprArg Exprs, 6227 SourceLocation RParenLoc, 6228 bool TypeMayContainAuto) { 6229 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6230 6231 // If there is no declaration, there was an error parsing it. Just ignore 6232 // the initializer. 6233 if (RealDecl == 0) 6234 return; 6235 6236 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6237 if (!VDecl) { 6238 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6239 RealDecl->setInvalidDecl(); 6240 return; 6241 } 6242 6243 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6244 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6245 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6246 if (Exprs.size() > 1) { 6247 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6248 diag::err_auto_var_init_multiple_expressions) 6249 << VDecl->getDeclName() << VDecl->getType() 6250 << VDecl->getSourceRange(); 6251 RealDecl->setInvalidDecl(); 6252 return; 6253 } 6254 6255 Expr *Init = Exprs.get()[0]; 6256 TypeSourceInfo *DeducedType = 0; 6257 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6258 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6259 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6260 << Init->getSourceRange(); 6261 if (!DeducedType) { 6262 RealDecl->setInvalidDecl(); 6263 return; 6264 } 6265 VDecl->setTypeSourceInfo(DeducedType); 6266 VDecl->setType(DeducedType->getType()); 6267 6268 // If this is a redeclaration, check that the type we just deduced matches 6269 // the previously declared type. 6270 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6271 MergeVarDeclTypes(VDecl, Old); 6272 } 6273 6274 // We will represent direct-initialization similarly to copy-initialization: 6275 // int x(1); -as-> int x = 1; 6276 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6277 // 6278 // Clients that want to distinguish between the two forms, can check for 6279 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6280 // A major benefit is that clients that don't particularly care about which 6281 // exactly form was it (like the CodeGen) can handle both cases without 6282 // special case code. 6283 6284 // C++ 8.5p11: 6285 // The form of initialization (using parentheses or '=') is generally 6286 // insignificant, but does matter when the entity being initialized has a 6287 // class type. 6288 6289 if (!VDecl->getType()->isDependentType() && 6290 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6291 diag::err_typecheck_decl_incomplete_type)) { 6292 VDecl->setInvalidDecl(); 6293 return; 6294 } 6295 6296 // The variable can not have an abstract class type. 6297 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6298 diag::err_abstract_type_in_decl, 6299 AbstractVariableType)) 6300 VDecl->setInvalidDecl(); 6301 6302 const VarDecl *Def; 6303 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6304 Diag(VDecl->getLocation(), diag::err_redefinition) 6305 << VDecl->getDeclName(); 6306 Diag(Def->getLocation(), diag::note_previous_definition); 6307 VDecl->setInvalidDecl(); 6308 return; 6309 } 6310 6311 // C++ [class.static.data]p4 6312 // If a static data member is of const integral or const 6313 // enumeration type, its declaration in the class definition can 6314 // specify a constant-initializer which shall be an integral 6315 // constant expression (5.19). In that case, the member can appear 6316 // in integral constant expressions. The member shall still be 6317 // defined in a namespace scope if it is used in the program and the 6318 // namespace scope definition shall not contain an initializer. 6319 // 6320 // We already performed a redefinition check above, but for static 6321 // data members we also need to check whether there was an in-class 6322 // declaration with an initializer. 6323 const VarDecl* PrevInit = 0; 6324 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6325 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6326 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6327 return; 6328 } 6329 6330 bool IsDependent = false; 6331 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6332 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6333 VDecl->setInvalidDecl(); 6334 return; 6335 } 6336 6337 if (Exprs.get()[I]->isTypeDependent()) 6338 IsDependent = true; 6339 } 6340 6341 // If either the declaration has a dependent type or if any of the 6342 // expressions is type-dependent, we represent the initialization 6343 // via a ParenListExpr for later use during template instantiation. 6344 if (VDecl->getType()->isDependentType() || IsDependent) { 6345 // Let clients know that initialization was done with a direct initializer. 6346 VDecl->setCXXDirectInitializer(true); 6347 6348 // Store the initialization expressions as a ParenListExpr. 6349 unsigned NumExprs = Exprs.size(); 6350 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6351 (Expr **)Exprs.release(), 6352 NumExprs, RParenLoc)); 6353 return; 6354 } 6355 6356 // Capture the variable that is being initialized and the style of 6357 // initialization. 6358 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6359 6360 // FIXME: Poor source location information. 6361 InitializationKind Kind 6362 = InitializationKind::CreateDirect(VDecl->getLocation(), 6363 LParenLoc, RParenLoc); 6364 6365 InitializationSequence InitSeq(*this, Entity, Kind, 6366 Exprs.get(), Exprs.size()); 6367 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6368 if (Result.isInvalid()) { 6369 VDecl->setInvalidDecl(); 6370 return; 6371 } 6372 6373 CheckImplicitConversions(Result.get(), LParenLoc); 6374 6375 Result = MaybeCreateExprWithCleanups(Result); 6376 VDecl->setInit(Result.takeAs<Expr>()); 6377 VDecl->setCXXDirectInitializer(true); 6378 6379 CheckCompleteVariableDeclaration(VDecl); 6380} 6381 6382/// \brief Given a constructor and the set of arguments provided for the 6383/// constructor, convert the arguments and add any required default arguments 6384/// to form a proper call to this constructor. 6385/// 6386/// \returns true if an error occurred, false otherwise. 6387bool 6388Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6389 MultiExprArg ArgsPtr, 6390 SourceLocation Loc, 6391 ASTOwningVector<Expr*> &ConvertedArgs) { 6392 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6393 unsigned NumArgs = ArgsPtr.size(); 6394 Expr **Args = (Expr **)ArgsPtr.get(); 6395 6396 const FunctionProtoType *Proto 6397 = Constructor->getType()->getAs<FunctionProtoType>(); 6398 assert(Proto && "Constructor without a prototype?"); 6399 unsigned NumArgsInProto = Proto->getNumArgs(); 6400 6401 // If too few arguments are available, we'll fill in the rest with defaults. 6402 if (NumArgs < NumArgsInProto) 6403 ConvertedArgs.reserve(NumArgsInProto); 6404 else 6405 ConvertedArgs.reserve(NumArgs); 6406 6407 VariadicCallType CallType = 6408 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6409 llvm::SmallVector<Expr *, 8> AllArgs; 6410 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6411 Proto, 0, Args, NumArgs, AllArgs, 6412 CallType); 6413 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6414 ConvertedArgs.push_back(AllArgs[i]); 6415 return Invalid; 6416} 6417 6418static inline bool 6419CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6420 const FunctionDecl *FnDecl) { 6421 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6422 if (isa<NamespaceDecl>(DC)) { 6423 return SemaRef.Diag(FnDecl->getLocation(), 6424 diag::err_operator_new_delete_declared_in_namespace) 6425 << FnDecl->getDeclName(); 6426 } 6427 6428 if (isa<TranslationUnitDecl>(DC) && 6429 FnDecl->getStorageClass() == SC_Static) { 6430 return SemaRef.Diag(FnDecl->getLocation(), 6431 diag::err_operator_new_delete_declared_static) 6432 << FnDecl->getDeclName(); 6433 } 6434 6435 return false; 6436} 6437 6438static inline bool 6439CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6440 CanQualType ExpectedResultType, 6441 CanQualType ExpectedFirstParamType, 6442 unsigned DependentParamTypeDiag, 6443 unsigned InvalidParamTypeDiag) { 6444 QualType ResultType = 6445 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6446 6447 // Check that the result type is not dependent. 6448 if (ResultType->isDependentType()) 6449 return SemaRef.Diag(FnDecl->getLocation(), 6450 diag::err_operator_new_delete_dependent_result_type) 6451 << FnDecl->getDeclName() << ExpectedResultType; 6452 6453 // Check that the result type is what we expect. 6454 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6455 return SemaRef.Diag(FnDecl->getLocation(), 6456 diag::err_operator_new_delete_invalid_result_type) 6457 << FnDecl->getDeclName() << ExpectedResultType; 6458 6459 // A function template must have at least 2 parameters. 6460 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6461 return SemaRef.Diag(FnDecl->getLocation(), 6462 diag::err_operator_new_delete_template_too_few_parameters) 6463 << FnDecl->getDeclName(); 6464 6465 // The function decl must have at least 1 parameter. 6466 if (FnDecl->getNumParams() == 0) 6467 return SemaRef.Diag(FnDecl->getLocation(), 6468 diag::err_operator_new_delete_too_few_parameters) 6469 << FnDecl->getDeclName(); 6470 6471 // Check the the first parameter type is not dependent. 6472 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6473 if (FirstParamType->isDependentType()) 6474 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6475 << FnDecl->getDeclName() << ExpectedFirstParamType; 6476 6477 // Check that the first parameter type is what we expect. 6478 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6479 ExpectedFirstParamType) 6480 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6481 << FnDecl->getDeclName() << ExpectedFirstParamType; 6482 6483 return false; 6484} 6485 6486static bool 6487CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6488 // C++ [basic.stc.dynamic.allocation]p1: 6489 // A program is ill-formed if an allocation function is declared in a 6490 // namespace scope other than global scope or declared static in global 6491 // scope. 6492 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6493 return true; 6494 6495 CanQualType SizeTy = 6496 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6497 6498 // C++ [basic.stc.dynamic.allocation]p1: 6499 // The return type shall be void*. The first parameter shall have type 6500 // std::size_t. 6501 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6502 SizeTy, 6503 diag::err_operator_new_dependent_param_type, 6504 diag::err_operator_new_param_type)) 6505 return true; 6506 6507 // C++ [basic.stc.dynamic.allocation]p1: 6508 // The first parameter shall not have an associated default argument. 6509 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6510 return SemaRef.Diag(FnDecl->getLocation(), 6511 diag::err_operator_new_default_arg) 6512 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6513 6514 return false; 6515} 6516 6517static bool 6518CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6519 // C++ [basic.stc.dynamic.deallocation]p1: 6520 // A program is ill-formed if deallocation functions are declared in a 6521 // namespace scope other than global scope or declared static in global 6522 // scope. 6523 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6524 return true; 6525 6526 // C++ [basic.stc.dynamic.deallocation]p2: 6527 // Each deallocation function shall return void and its first parameter 6528 // shall be void*. 6529 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6530 SemaRef.Context.VoidPtrTy, 6531 diag::err_operator_delete_dependent_param_type, 6532 diag::err_operator_delete_param_type)) 6533 return true; 6534 6535 return false; 6536} 6537 6538/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6539/// of this overloaded operator is well-formed. If so, returns false; 6540/// otherwise, emits appropriate diagnostics and returns true. 6541bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6542 assert(FnDecl && FnDecl->isOverloadedOperator() && 6543 "Expected an overloaded operator declaration"); 6544 6545 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6546 6547 // C++ [over.oper]p5: 6548 // The allocation and deallocation functions, operator new, 6549 // operator new[], operator delete and operator delete[], are 6550 // described completely in 3.7.3. The attributes and restrictions 6551 // found in the rest of this subclause do not apply to them unless 6552 // explicitly stated in 3.7.3. 6553 if (Op == OO_Delete || Op == OO_Array_Delete) 6554 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6555 6556 if (Op == OO_New || Op == OO_Array_New) 6557 return CheckOperatorNewDeclaration(*this, FnDecl); 6558 6559 // C++ [over.oper]p6: 6560 // An operator function shall either be a non-static member 6561 // function or be a non-member function and have at least one 6562 // parameter whose type is a class, a reference to a class, an 6563 // enumeration, or a reference to an enumeration. 6564 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6565 if (MethodDecl->isStatic()) 6566 return Diag(FnDecl->getLocation(), 6567 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6568 } else { 6569 bool ClassOrEnumParam = false; 6570 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6571 ParamEnd = FnDecl->param_end(); 6572 Param != ParamEnd; ++Param) { 6573 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6574 if (ParamType->isDependentType() || ParamType->isRecordType() || 6575 ParamType->isEnumeralType()) { 6576 ClassOrEnumParam = true; 6577 break; 6578 } 6579 } 6580 6581 if (!ClassOrEnumParam) 6582 return Diag(FnDecl->getLocation(), 6583 diag::err_operator_overload_needs_class_or_enum) 6584 << FnDecl->getDeclName(); 6585 } 6586 6587 // C++ [over.oper]p8: 6588 // An operator function cannot have default arguments (8.3.6), 6589 // except where explicitly stated below. 6590 // 6591 // Only the function-call operator allows default arguments 6592 // (C++ [over.call]p1). 6593 if (Op != OO_Call) { 6594 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6595 Param != FnDecl->param_end(); ++Param) { 6596 if ((*Param)->hasDefaultArg()) 6597 return Diag((*Param)->getLocation(), 6598 diag::err_operator_overload_default_arg) 6599 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6600 } 6601 } 6602 6603 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6604 { false, false, false } 6605#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6606 , { Unary, Binary, MemberOnly } 6607#include "clang/Basic/OperatorKinds.def" 6608 }; 6609 6610 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6611 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6612 bool MustBeMemberOperator = OperatorUses[Op][2]; 6613 6614 // C++ [over.oper]p8: 6615 // [...] Operator functions cannot have more or fewer parameters 6616 // than the number required for the corresponding operator, as 6617 // described in the rest of this subclause. 6618 unsigned NumParams = FnDecl->getNumParams() 6619 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6620 if (Op != OO_Call && 6621 ((NumParams == 1 && !CanBeUnaryOperator) || 6622 (NumParams == 2 && !CanBeBinaryOperator) || 6623 (NumParams < 1) || (NumParams > 2))) { 6624 // We have the wrong number of parameters. 6625 unsigned ErrorKind; 6626 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6627 ErrorKind = 2; // 2 -> unary or binary. 6628 } else if (CanBeUnaryOperator) { 6629 ErrorKind = 0; // 0 -> unary 6630 } else { 6631 assert(CanBeBinaryOperator && 6632 "All non-call overloaded operators are unary or binary!"); 6633 ErrorKind = 1; // 1 -> binary 6634 } 6635 6636 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6637 << FnDecl->getDeclName() << NumParams << ErrorKind; 6638 } 6639 6640 // Overloaded operators other than operator() cannot be variadic. 6641 if (Op != OO_Call && 6642 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6643 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6644 << FnDecl->getDeclName(); 6645 } 6646 6647 // Some operators must be non-static member functions. 6648 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6649 return Diag(FnDecl->getLocation(), 6650 diag::err_operator_overload_must_be_member) 6651 << FnDecl->getDeclName(); 6652 } 6653 6654 // C++ [over.inc]p1: 6655 // The user-defined function called operator++ implements the 6656 // prefix and postfix ++ operator. If this function is a member 6657 // function with no parameters, or a non-member function with one 6658 // parameter of class or enumeration type, it defines the prefix 6659 // increment operator ++ for objects of that type. If the function 6660 // is a member function with one parameter (which shall be of type 6661 // int) or a non-member function with two parameters (the second 6662 // of which shall be of type int), it defines the postfix 6663 // increment operator ++ for objects of that type. 6664 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6665 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6666 bool ParamIsInt = false; 6667 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6668 ParamIsInt = BT->getKind() == BuiltinType::Int; 6669 6670 if (!ParamIsInt) 6671 return Diag(LastParam->getLocation(), 6672 diag::err_operator_overload_post_incdec_must_be_int) 6673 << LastParam->getType() << (Op == OO_MinusMinus); 6674 } 6675 6676 return false; 6677} 6678 6679/// CheckLiteralOperatorDeclaration - Check whether the declaration 6680/// of this literal operator function is well-formed. If so, returns 6681/// false; otherwise, emits appropriate diagnostics and returns true. 6682bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6683 DeclContext *DC = FnDecl->getDeclContext(); 6684 Decl::Kind Kind = DC->getDeclKind(); 6685 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6686 Kind != Decl::LinkageSpec) { 6687 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6688 << FnDecl->getDeclName(); 6689 return true; 6690 } 6691 6692 bool Valid = false; 6693 6694 // template <char...> type operator "" name() is the only valid template 6695 // signature, and the only valid signature with no parameters. 6696 if (FnDecl->param_size() == 0) { 6697 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6698 // Must have only one template parameter 6699 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6700 if (Params->size() == 1) { 6701 NonTypeTemplateParmDecl *PmDecl = 6702 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6703 6704 // The template parameter must be a char parameter pack. 6705 if (PmDecl && PmDecl->isTemplateParameterPack() && 6706 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6707 Valid = true; 6708 } 6709 } 6710 } else { 6711 // Check the first parameter 6712 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6713 6714 QualType T = (*Param)->getType(); 6715 6716 // unsigned long long int, long double, and any character type are allowed 6717 // as the only parameters. 6718 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6719 Context.hasSameType(T, Context.LongDoubleTy) || 6720 Context.hasSameType(T, Context.CharTy) || 6721 Context.hasSameType(T, Context.WCharTy) || 6722 Context.hasSameType(T, Context.Char16Ty) || 6723 Context.hasSameType(T, Context.Char32Ty)) { 6724 if (++Param == FnDecl->param_end()) 6725 Valid = true; 6726 goto FinishedParams; 6727 } 6728 6729 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6730 const PointerType *PT = T->getAs<PointerType>(); 6731 if (!PT) 6732 goto FinishedParams; 6733 T = PT->getPointeeType(); 6734 if (!T.isConstQualified()) 6735 goto FinishedParams; 6736 T = T.getUnqualifiedType(); 6737 6738 // Move on to the second parameter; 6739 ++Param; 6740 6741 // If there is no second parameter, the first must be a const char * 6742 if (Param == FnDecl->param_end()) { 6743 if (Context.hasSameType(T, Context.CharTy)) 6744 Valid = true; 6745 goto FinishedParams; 6746 } 6747 6748 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6749 // are allowed as the first parameter to a two-parameter function 6750 if (!(Context.hasSameType(T, Context.CharTy) || 6751 Context.hasSameType(T, Context.WCharTy) || 6752 Context.hasSameType(T, Context.Char16Ty) || 6753 Context.hasSameType(T, Context.Char32Ty))) 6754 goto FinishedParams; 6755 6756 // The second and final parameter must be an std::size_t 6757 T = (*Param)->getType().getUnqualifiedType(); 6758 if (Context.hasSameType(T, Context.getSizeType()) && 6759 ++Param == FnDecl->param_end()) 6760 Valid = true; 6761 } 6762 6763 // FIXME: This diagnostic is absolutely terrible. 6764FinishedParams: 6765 if (!Valid) { 6766 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6767 << FnDecl->getDeclName(); 6768 return true; 6769 } 6770 6771 return false; 6772} 6773 6774/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6775/// linkage specification, including the language and (if present) 6776/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6777/// the location of the language string literal, which is provided 6778/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6779/// the '{' brace. Otherwise, this linkage specification does not 6780/// have any braces. 6781Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6782 SourceLocation LangLoc, 6783 llvm::StringRef Lang, 6784 SourceLocation LBraceLoc) { 6785 LinkageSpecDecl::LanguageIDs Language; 6786 if (Lang == "\"C\"") 6787 Language = LinkageSpecDecl::lang_c; 6788 else if (Lang == "\"C++\"") 6789 Language = LinkageSpecDecl::lang_cxx; 6790 else { 6791 Diag(LangLoc, diag::err_bad_language); 6792 return 0; 6793 } 6794 6795 // FIXME: Add all the various semantics of linkage specifications 6796 6797 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6798 ExternLoc, LangLoc, Language); 6799 CurContext->addDecl(D); 6800 PushDeclContext(S, D); 6801 return D; 6802} 6803 6804/// ActOnFinishLinkageSpecification - Complete the definition of 6805/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6806/// valid, it's the position of the closing '}' brace in a linkage 6807/// specification that uses braces. 6808Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6809 Decl *LinkageSpec, 6810 SourceLocation RBraceLoc) { 6811 if (LinkageSpec) { 6812 if (RBraceLoc.isValid()) { 6813 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6814 LSDecl->setRBraceLoc(RBraceLoc); 6815 } 6816 PopDeclContext(); 6817 } 6818 return LinkageSpec; 6819} 6820 6821/// \brief Perform semantic analysis for the variable declaration that 6822/// occurs within a C++ catch clause, returning the newly-created 6823/// variable. 6824VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6825 TypeSourceInfo *TInfo, 6826 SourceLocation StartLoc, 6827 SourceLocation Loc, 6828 IdentifierInfo *Name) { 6829 bool Invalid = false; 6830 QualType ExDeclType = TInfo->getType(); 6831 6832 // Arrays and functions decay. 6833 if (ExDeclType->isArrayType()) 6834 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6835 else if (ExDeclType->isFunctionType()) 6836 ExDeclType = Context.getPointerType(ExDeclType); 6837 6838 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6839 // The exception-declaration shall not denote a pointer or reference to an 6840 // incomplete type, other than [cv] void*. 6841 // N2844 forbids rvalue references. 6842 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6843 Diag(Loc, diag::err_catch_rvalue_ref); 6844 Invalid = true; 6845 } 6846 6847 // GCC allows catching pointers and references to incomplete types 6848 // as an extension; so do we, but we warn by default. 6849 6850 QualType BaseType = ExDeclType; 6851 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6852 unsigned DK = diag::err_catch_incomplete; 6853 bool IncompleteCatchIsInvalid = true; 6854 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6855 BaseType = Ptr->getPointeeType(); 6856 Mode = 1; 6857 DK = diag::ext_catch_incomplete_ptr; 6858 IncompleteCatchIsInvalid = false; 6859 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6860 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6861 BaseType = Ref->getPointeeType(); 6862 Mode = 2; 6863 DK = diag::ext_catch_incomplete_ref; 6864 IncompleteCatchIsInvalid = false; 6865 } 6866 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6867 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6868 IncompleteCatchIsInvalid) 6869 Invalid = true; 6870 6871 if (!Invalid && !ExDeclType->isDependentType() && 6872 RequireNonAbstractType(Loc, ExDeclType, 6873 diag::err_abstract_type_in_decl, 6874 AbstractVariableType)) 6875 Invalid = true; 6876 6877 // Only the non-fragile NeXT runtime currently supports C++ catches 6878 // of ObjC types, and no runtime supports catching ObjC types by value. 6879 if (!Invalid && getLangOptions().ObjC1) { 6880 QualType T = ExDeclType; 6881 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6882 T = RT->getPointeeType(); 6883 6884 if (T->isObjCObjectType()) { 6885 Diag(Loc, diag::err_objc_object_catch); 6886 Invalid = true; 6887 } else if (T->isObjCObjectPointerType()) { 6888 if (!getLangOptions().ObjCNonFragileABI) { 6889 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6890 Invalid = true; 6891 } 6892 } 6893 } 6894 6895 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6896 ExDeclType, TInfo, SC_None, SC_None); 6897 ExDecl->setExceptionVariable(true); 6898 6899 if (!Invalid) { 6900 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6901 // C++ [except.handle]p16: 6902 // The object declared in an exception-declaration or, if the 6903 // exception-declaration does not specify a name, a temporary (12.2) is 6904 // copy-initialized (8.5) from the exception object. [...] 6905 // The object is destroyed when the handler exits, after the destruction 6906 // of any automatic objects initialized within the handler. 6907 // 6908 // We just pretend to initialize the object with itself, then make sure 6909 // it can be destroyed later. 6910 QualType initType = ExDeclType; 6911 6912 InitializedEntity entity = 6913 InitializedEntity::InitializeVariable(ExDecl); 6914 InitializationKind initKind = 6915 InitializationKind::CreateCopy(Loc, SourceLocation()); 6916 6917 Expr *opaqueValue = 6918 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6919 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6920 ExprResult result = sequence.Perform(*this, entity, initKind, 6921 MultiExprArg(&opaqueValue, 1)); 6922 if (result.isInvalid()) 6923 Invalid = true; 6924 else { 6925 // If the constructor used was non-trivial, set this as the 6926 // "initializer". 6927 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6928 if (!construct->getConstructor()->isTrivial()) { 6929 Expr *init = MaybeCreateExprWithCleanups(construct); 6930 ExDecl->setInit(init); 6931 } 6932 6933 // And make sure it's destructable. 6934 FinalizeVarWithDestructor(ExDecl, recordType); 6935 } 6936 } 6937 } 6938 6939 if (Invalid) 6940 ExDecl->setInvalidDecl(); 6941 6942 return ExDecl; 6943} 6944 6945/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6946/// handler. 6947Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6948 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6949 bool Invalid = D.isInvalidType(); 6950 6951 // Check for unexpanded parameter packs. 6952 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6953 UPPC_ExceptionType)) { 6954 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6955 D.getIdentifierLoc()); 6956 Invalid = true; 6957 } 6958 6959 IdentifierInfo *II = D.getIdentifier(); 6960 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6961 LookupOrdinaryName, 6962 ForRedeclaration)) { 6963 // The scope should be freshly made just for us. There is just no way 6964 // it contains any previous declaration. 6965 assert(!S->isDeclScope(PrevDecl)); 6966 if (PrevDecl->isTemplateParameter()) { 6967 // Maybe we will complain about the shadowed template parameter. 6968 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6969 } 6970 } 6971 6972 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6973 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6974 << D.getCXXScopeSpec().getRange(); 6975 Invalid = true; 6976 } 6977 6978 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 6979 D.getSourceRange().getBegin(), 6980 D.getIdentifierLoc(), 6981 D.getIdentifier()); 6982 if (Invalid) 6983 ExDecl->setInvalidDecl(); 6984 6985 // Add the exception declaration into this scope. 6986 if (II) 6987 PushOnScopeChains(ExDecl, S); 6988 else 6989 CurContext->addDecl(ExDecl); 6990 6991 ProcessDeclAttributes(S, ExDecl, D); 6992 return ExDecl; 6993} 6994 6995Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 6996 Expr *AssertExpr, 6997 Expr *AssertMessageExpr_, 6998 SourceLocation RParenLoc) { 6999 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7000 7001 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7002 llvm::APSInt Value(32); 7003 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7004 Diag(StaticAssertLoc, 7005 diag::err_static_assert_expression_is_not_constant) << 7006 AssertExpr->getSourceRange(); 7007 return 0; 7008 } 7009 7010 if (Value == 0) { 7011 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7012 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7013 } 7014 } 7015 7016 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7017 return 0; 7018 7019 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7020 AssertExpr, AssertMessage, RParenLoc); 7021 7022 CurContext->addDecl(Decl); 7023 return Decl; 7024} 7025 7026/// \brief Perform semantic analysis of the given friend type declaration. 7027/// 7028/// \returns A friend declaration that. 7029FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7030 TypeSourceInfo *TSInfo) { 7031 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7032 7033 QualType T = TSInfo->getType(); 7034 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7035 7036 if (!getLangOptions().CPlusPlus0x) { 7037 // C++03 [class.friend]p2: 7038 // An elaborated-type-specifier shall be used in a friend declaration 7039 // for a class.* 7040 // 7041 // * The class-key of the elaborated-type-specifier is required. 7042 if (!ActiveTemplateInstantiations.empty()) { 7043 // Do not complain about the form of friend template types during 7044 // template instantiation; we will already have complained when the 7045 // template was declared. 7046 } else if (!T->isElaboratedTypeSpecifier()) { 7047 // If we evaluated the type to a record type, suggest putting 7048 // a tag in front. 7049 if (const RecordType *RT = T->getAs<RecordType>()) { 7050 RecordDecl *RD = RT->getDecl(); 7051 7052 std::string InsertionText = std::string(" ") + RD->getKindName(); 7053 7054 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7055 << (unsigned) RD->getTagKind() 7056 << T 7057 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7058 InsertionText); 7059 } else { 7060 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7061 << T 7062 << SourceRange(FriendLoc, TypeRange.getEnd()); 7063 } 7064 } else if (T->getAs<EnumType>()) { 7065 Diag(FriendLoc, diag::ext_enum_friend) 7066 << T 7067 << SourceRange(FriendLoc, TypeRange.getEnd()); 7068 } 7069 } 7070 7071 // C++0x [class.friend]p3: 7072 // If the type specifier in a friend declaration designates a (possibly 7073 // cv-qualified) class type, that class is declared as a friend; otherwise, 7074 // the friend declaration is ignored. 7075 7076 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7077 // in [class.friend]p3 that we do not implement. 7078 7079 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7080} 7081 7082/// Handle a friend tag declaration where the scope specifier was 7083/// templated. 7084Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7085 unsigned TagSpec, SourceLocation TagLoc, 7086 CXXScopeSpec &SS, 7087 IdentifierInfo *Name, SourceLocation NameLoc, 7088 AttributeList *Attr, 7089 MultiTemplateParamsArg TempParamLists) { 7090 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7091 7092 bool isExplicitSpecialization = false; 7093 bool Invalid = false; 7094 7095 if (TemplateParameterList *TemplateParams 7096 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7097 TempParamLists.get(), 7098 TempParamLists.size(), 7099 /*friend*/ true, 7100 isExplicitSpecialization, 7101 Invalid)) { 7102 if (TemplateParams->size() > 0) { 7103 // This is a declaration of a class template. 7104 if (Invalid) 7105 return 0; 7106 7107 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7108 SS, Name, NameLoc, Attr, 7109 TemplateParams, AS_public, 7110 TempParamLists.size() - 1, 7111 (TemplateParameterList**) TempParamLists.release()).take(); 7112 } else { 7113 // The "template<>" header is extraneous. 7114 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7115 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7116 isExplicitSpecialization = true; 7117 } 7118 } 7119 7120 if (Invalid) return 0; 7121 7122 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7123 7124 bool isAllExplicitSpecializations = true; 7125 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7126 if (TempParamLists.get()[I]->size()) { 7127 isAllExplicitSpecializations = false; 7128 break; 7129 } 7130 } 7131 7132 // FIXME: don't ignore attributes. 7133 7134 // If it's explicit specializations all the way down, just forget 7135 // about the template header and build an appropriate non-templated 7136 // friend. TODO: for source fidelity, remember the headers. 7137 if (isAllExplicitSpecializations) { 7138 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7139 ElaboratedTypeKeyword Keyword 7140 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7141 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7142 *Name, NameLoc); 7143 if (T.isNull()) 7144 return 0; 7145 7146 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7147 if (isa<DependentNameType>(T)) { 7148 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7149 TL.setKeywordLoc(TagLoc); 7150 TL.setQualifierLoc(QualifierLoc); 7151 TL.setNameLoc(NameLoc); 7152 } else { 7153 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7154 TL.setKeywordLoc(TagLoc); 7155 TL.setQualifierLoc(QualifierLoc); 7156 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7157 } 7158 7159 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7160 TSI, FriendLoc); 7161 Friend->setAccess(AS_public); 7162 CurContext->addDecl(Friend); 7163 return Friend; 7164 } 7165 7166 // Handle the case of a templated-scope friend class. e.g. 7167 // template <class T> class A<T>::B; 7168 // FIXME: we don't support these right now. 7169 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7170 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7171 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7172 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7173 TL.setKeywordLoc(TagLoc); 7174 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7175 TL.setNameLoc(NameLoc); 7176 7177 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7178 TSI, FriendLoc); 7179 Friend->setAccess(AS_public); 7180 Friend->setUnsupportedFriend(true); 7181 CurContext->addDecl(Friend); 7182 return Friend; 7183} 7184 7185 7186/// Handle a friend type declaration. This works in tandem with 7187/// ActOnTag. 7188/// 7189/// Notes on friend class templates: 7190/// 7191/// We generally treat friend class declarations as if they were 7192/// declaring a class. So, for example, the elaborated type specifier 7193/// in a friend declaration is required to obey the restrictions of a 7194/// class-head (i.e. no typedefs in the scope chain), template 7195/// parameters are required to match up with simple template-ids, &c. 7196/// However, unlike when declaring a template specialization, it's 7197/// okay to refer to a template specialization without an empty 7198/// template parameter declaration, e.g. 7199/// friend class A<T>::B<unsigned>; 7200/// We permit this as a special case; if there are any template 7201/// parameters present at all, require proper matching, i.e. 7202/// template <> template <class T> friend class A<int>::B; 7203Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7204 MultiTemplateParamsArg TempParams) { 7205 SourceLocation Loc = DS.getSourceRange().getBegin(); 7206 7207 assert(DS.isFriendSpecified()); 7208 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7209 7210 // Try to convert the decl specifier to a type. This works for 7211 // friend templates because ActOnTag never produces a ClassTemplateDecl 7212 // for a TUK_Friend. 7213 Declarator TheDeclarator(DS, Declarator::MemberContext); 7214 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7215 QualType T = TSI->getType(); 7216 if (TheDeclarator.isInvalidType()) 7217 return 0; 7218 7219 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7220 return 0; 7221 7222 // This is definitely an error in C++98. It's probably meant to 7223 // be forbidden in C++0x, too, but the specification is just 7224 // poorly written. 7225 // 7226 // The problem is with declarations like the following: 7227 // template <T> friend A<T>::foo; 7228 // where deciding whether a class C is a friend or not now hinges 7229 // on whether there exists an instantiation of A that causes 7230 // 'foo' to equal C. There are restrictions on class-heads 7231 // (which we declare (by fiat) elaborated friend declarations to 7232 // be) that makes this tractable. 7233 // 7234 // FIXME: handle "template <> friend class A<T>;", which 7235 // is possibly well-formed? Who even knows? 7236 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7237 Diag(Loc, diag::err_tagless_friend_type_template) 7238 << DS.getSourceRange(); 7239 return 0; 7240 } 7241 7242 // C++98 [class.friend]p1: A friend of a class is a function 7243 // or class that is not a member of the class . . . 7244 // This is fixed in DR77, which just barely didn't make the C++03 7245 // deadline. It's also a very silly restriction that seriously 7246 // affects inner classes and which nobody else seems to implement; 7247 // thus we never diagnose it, not even in -pedantic. 7248 // 7249 // But note that we could warn about it: it's always useless to 7250 // friend one of your own members (it's not, however, worthless to 7251 // friend a member of an arbitrary specialization of your template). 7252 7253 Decl *D; 7254 if (unsigned NumTempParamLists = TempParams.size()) 7255 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7256 NumTempParamLists, 7257 TempParams.release(), 7258 TSI, 7259 DS.getFriendSpecLoc()); 7260 else 7261 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7262 7263 if (!D) 7264 return 0; 7265 7266 D->setAccess(AS_public); 7267 CurContext->addDecl(D); 7268 7269 return D; 7270} 7271 7272Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7273 MultiTemplateParamsArg TemplateParams) { 7274 const DeclSpec &DS = D.getDeclSpec(); 7275 7276 assert(DS.isFriendSpecified()); 7277 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7278 7279 SourceLocation Loc = D.getIdentifierLoc(); 7280 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7281 QualType T = TInfo->getType(); 7282 7283 // C++ [class.friend]p1 7284 // A friend of a class is a function or class.... 7285 // Note that this sees through typedefs, which is intended. 7286 // It *doesn't* see through dependent types, which is correct 7287 // according to [temp.arg.type]p3: 7288 // If a declaration acquires a function type through a 7289 // type dependent on a template-parameter and this causes 7290 // a declaration that does not use the syntactic form of a 7291 // function declarator to have a function type, the program 7292 // is ill-formed. 7293 if (!T->isFunctionType()) { 7294 Diag(Loc, diag::err_unexpected_friend); 7295 7296 // It might be worthwhile to try to recover by creating an 7297 // appropriate declaration. 7298 return 0; 7299 } 7300 7301 // C++ [namespace.memdef]p3 7302 // - If a friend declaration in a non-local class first declares a 7303 // class or function, the friend class or function is a member 7304 // of the innermost enclosing namespace. 7305 // - The name of the friend is not found by simple name lookup 7306 // until a matching declaration is provided in that namespace 7307 // scope (either before or after the class declaration granting 7308 // friendship). 7309 // - If a friend function is called, its name may be found by the 7310 // name lookup that considers functions from namespaces and 7311 // classes associated with the types of the function arguments. 7312 // - When looking for a prior declaration of a class or a function 7313 // declared as a friend, scopes outside the innermost enclosing 7314 // namespace scope are not considered. 7315 7316 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7317 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7318 DeclarationName Name = NameInfo.getName(); 7319 assert(Name); 7320 7321 // Check for unexpanded parameter packs. 7322 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7323 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7324 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7325 return 0; 7326 7327 // The context we found the declaration in, or in which we should 7328 // create the declaration. 7329 DeclContext *DC; 7330 Scope *DCScope = S; 7331 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7332 ForRedeclaration); 7333 7334 // FIXME: there are different rules in local classes 7335 7336 // There are four cases here. 7337 // - There's no scope specifier, in which case we just go to the 7338 // appropriate scope and look for a function or function template 7339 // there as appropriate. 7340 // Recover from invalid scope qualifiers as if they just weren't there. 7341 if (SS.isInvalid() || !SS.isSet()) { 7342 // C++0x [namespace.memdef]p3: 7343 // If the name in a friend declaration is neither qualified nor 7344 // a template-id and the declaration is a function or an 7345 // elaborated-type-specifier, the lookup to determine whether 7346 // the entity has been previously declared shall not consider 7347 // any scopes outside the innermost enclosing namespace. 7348 // C++0x [class.friend]p11: 7349 // If a friend declaration appears in a local class and the name 7350 // specified is an unqualified name, a prior declaration is 7351 // looked up without considering scopes that are outside the 7352 // innermost enclosing non-class scope. For a friend function 7353 // declaration, if there is no prior declaration, the program is 7354 // ill-formed. 7355 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7356 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7357 7358 // Find the appropriate context according to the above. 7359 DC = CurContext; 7360 while (true) { 7361 // Skip class contexts. If someone can cite chapter and verse 7362 // for this behavior, that would be nice --- it's what GCC and 7363 // EDG do, and it seems like a reasonable intent, but the spec 7364 // really only says that checks for unqualified existing 7365 // declarations should stop at the nearest enclosing namespace, 7366 // not that they should only consider the nearest enclosing 7367 // namespace. 7368 while (DC->isRecord()) 7369 DC = DC->getParent(); 7370 7371 LookupQualifiedName(Previous, DC); 7372 7373 // TODO: decide what we think about using declarations. 7374 if (isLocal || !Previous.empty()) 7375 break; 7376 7377 if (isTemplateId) { 7378 if (isa<TranslationUnitDecl>(DC)) break; 7379 } else { 7380 if (DC->isFileContext()) break; 7381 } 7382 DC = DC->getParent(); 7383 } 7384 7385 // C++ [class.friend]p1: A friend of a class is a function or 7386 // class that is not a member of the class . . . 7387 // C++0x changes this for both friend types and functions. 7388 // Most C++ 98 compilers do seem to give an error here, so 7389 // we do, too. 7390 if (!Previous.empty() && DC->Equals(CurContext) 7391 && !getLangOptions().CPlusPlus0x) 7392 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7393 7394 DCScope = getScopeForDeclContext(S, DC); 7395 7396 // - There's a non-dependent scope specifier, in which case we 7397 // compute it and do a previous lookup there for a function 7398 // or function template. 7399 } else if (!SS.getScopeRep()->isDependent()) { 7400 DC = computeDeclContext(SS); 7401 if (!DC) return 0; 7402 7403 if (RequireCompleteDeclContext(SS, DC)) return 0; 7404 7405 LookupQualifiedName(Previous, DC); 7406 7407 // Ignore things found implicitly in the wrong scope. 7408 // TODO: better diagnostics for this case. Suggesting the right 7409 // qualified scope would be nice... 7410 LookupResult::Filter F = Previous.makeFilter(); 7411 while (F.hasNext()) { 7412 NamedDecl *D = F.next(); 7413 if (!DC->InEnclosingNamespaceSetOf( 7414 D->getDeclContext()->getRedeclContext())) 7415 F.erase(); 7416 } 7417 F.done(); 7418 7419 if (Previous.empty()) { 7420 D.setInvalidType(); 7421 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7422 return 0; 7423 } 7424 7425 // C++ [class.friend]p1: A friend of a class is a function or 7426 // class that is not a member of the class . . . 7427 if (DC->Equals(CurContext)) 7428 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7429 7430 // - There's a scope specifier that does not match any template 7431 // parameter lists, in which case we use some arbitrary context, 7432 // create a method or method template, and wait for instantiation. 7433 // - There's a scope specifier that does match some template 7434 // parameter lists, which we don't handle right now. 7435 } else { 7436 DC = CurContext; 7437 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7438 } 7439 7440 if (!DC->isRecord()) { 7441 // This implies that it has to be an operator or function. 7442 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7443 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7444 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7445 Diag(Loc, diag::err_introducing_special_friend) << 7446 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7447 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7448 return 0; 7449 } 7450 } 7451 7452 bool Redeclaration = false; 7453 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7454 move(TemplateParams), 7455 IsDefinition, 7456 Redeclaration); 7457 if (!ND) return 0; 7458 7459 assert(ND->getDeclContext() == DC); 7460 assert(ND->getLexicalDeclContext() == CurContext); 7461 7462 // Add the function declaration to the appropriate lookup tables, 7463 // adjusting the redeclarations list as necessary. We don't 7464 // want to do this yet if the friending class is dependent. 7465 // 7466 // Also update the scope-based lookup if the target context's 7467 // lookup context is in lexical scope. 7468 if (!CurContext->isDependentContext()) { 7469 DC = DC->getRedeclContext(); 7470 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7471 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7472 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7473 } 7474 7475 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7476 D.getIdentifierLoc(), ND, 7477 DS.getFriendSpecLoc()); 7478 FrD->setAccess(AS_public); 7479 CurContext->addDecl(FrD); 7480 7481 if (ND->isInvalidDecl()) 7482 FrD->setInvalidDecl(); 7483 else { 7484 FunctionDecl *FD; 7485 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7486 FD = FTD->getTemplatedDecl(); 7487 else 7488 FD = cast<FunctionDecl>(ND); 7489 7490 // Mark templated-scope function declarations as unsupported. 7491 if (FD->getNumTemplateParameterLists()) 7492 FrD->setUnsupportedFriend(true); 7493 } 7494 7495 return ND; 7496} 7497 7498void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7499 AdjustDeclIfTemplate(Dcl); 7500 7501 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7502 if (!Fn) { 7503 Diag(DelLoc, diag::err_deleted_non_function); 7504 return; 7505 } 7506 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7507 Diag(DelLoc, diag::err_deleted_decl_not_first); 7508 Diag(Prev->getLocation(), diag::note_previous_declaration); 7509 // If the declaration wasn't the first, we delete the function anyway for 7510 // recovery. 7511 } 7512 Fn->setDeleted(); 7513} 7514 7515static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7516 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7517 Stmt *SubStmt = *CI; 7518 if (!SubStmt) 7519 continue; 7520 if (isa<ReturnStmt>(SubStmt)) 7521 Self.Diag(SubStmt->getSourceRange().getBegin(), 7522 diag::err_return_in_constructor_handler); 7523 if (!isa<Expr>(SubStmt)) 7524 SearchForReturnInStmt(Self, SubStmt); 7525 } 7526} 7527 7528void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7529 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7530 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7531 SearchForReturnInStmt(*this, Handler); 7532 } 7533} 7534 7535bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7536 const CXXMethodDecl *Old) { 7537 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7538 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7539 7540 if (Context.hasSameType(NewTy, OldTy) || 7541 NewTy->isDependentType() || OldTy->isDependentType()) 7542 return false; 7543 7544 // Check if the return types are covariant 7545 QualType NewClassTy, OldClassTy; 7546 7547 /// Both types must be pointers or references to classes. 7548 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7549 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7550 NewClassTy = NewPT->getPointeeType(); 7551 OldClassTy = OldPT->getPointeeType(); 7552 } 7553 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7554 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7555 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7556 NewClassTy = NewRT->getPointeeType(); 7557 OldClassTy = OldRT->getPointeeType(); 7558 } 7559 } 7560 } 7561 7562 // The return types aren't either both pointers or references to a class type. 7563 if (NewClassTy.isNull()) { 7564 Diag(New->getLocation(), 7565 diag::err_different_return_type_for_overriding_virtual_function) 7566 << New->getDeclName() << NewTy << OldTy; 7567 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7568 7569 return true; 7570 } 7571 7572 // C++ [class.virtual]p6: 7573 // If the return type of D::f differs from the return type of B::f, the 7574 // class type in the return type of D::f shall be complete at the point of 7575 // declaration of D::f or shall be the class type D. 7576 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7577 if (!RT->isBeingDefined() && 7578 RequireCompleteType(New->getLocation(), NewClassTy, 7579 PDiag(diag::err_covariant_return_incomplete) 7580 << New->getDeclName())) 7581 return true; 7582 } 7583 7584 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7585 // Check if the new class derives from the old class. 7586 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7587 Diag(New->getLocation(), 7588 diag::err_covariant_return_not_derived) 7589 << New->getDeclName() << NewTy << OldTy; 7590 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7591 return true; 7592 } 7593 7594 // Check if we the conversion from derived to base is valid. 7595 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7596 diag::err_covariant_return_inaccessible_base, 7597 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7598 // FIXME: Should this point to the return type? 7599 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7600 // FIXME: this note won't trigger for delayed access control 7601 // diagnostics, and it's impossible to get an undelayed error 7602 // here from access control during the original parse because 7603 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7604 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7605 return true; 7606 } 7607 } 7608 7609 // The qualifiers of the return types must be the same. 7610 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7611 Diag(New->getLocation(), 7612 diag::err_covariant_return_type_different_qualifications) 7613 << New->getDeclName() << NewTy << OldTy; 7614 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7615 return true; 7616 }; 7617 7618 7619 // The new class type must have the same or less qualifiers as the old type. 7620 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7621 Diag(New->getLocation(), 7622 diag::err_covariant_return_type_class_type_more_qualified) 7623 << New->getDeclName() << NewTy << OldTy; 7624 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7625 return true; 7626 }; 7627 7628 return false; 7629} 7630 7631/// \brief Mark the given method pure. 7632/// 7633/// \param Method the method to be marked pure. 7634/// 7635/// \param InitRange the source range that covers the "0" initializer. 7636bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7637 SourceLocation EndLoc = InitRange.getEnd(); 7638 if (EndLoc.isValid()) 7639 Method->setRangeEnd(EndLoc); 7640 7641 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7642 Method->setPure(); 7643 return false; 7644 } 7645 7646 if (!Method->isInvalidDecl()) 7647 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7648 << Method->getDeclName() << InitRange; 7649 return true; 7650} 7651 7652/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7653/// an initializer for the out-of-line declaration 'Dcl'. The scope 7654/// is a fresh scope pushed for just this purpose. 7655/// 7656/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7657/// static data member of class X, names should be looked up in the scope of 7658/// class X. 7659void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7660 // If there is no declaration, there was an error parsing it. 7661 if (D == 0 || D->isInvalidDecl()) return; 7662 7663 // We should only get called for declarations with scope specifiers, like: 7664 // int foo::bar; 7665 assert(D->isOutOfLine()); 7666 EnterDeclaratorContext(S, D->getDeclContext()); 7667} 7668 7669/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7670/// initializer for the out-of-line declaration 'D'. 7671void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7672 // If there is no declaration, there was an error parsing it. 7673 if (D == 0 || D->isInvalidDecl()) return; 7674 7675 assert(D->isOutOfLine()); 7676 ExitDeclaratorContext(S); 7677} 7678 7679/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7680/// C++ if/switch/while/for statement. 7681/// e.g: "if (int x = f()) {...}" 7682DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7683 // C++ 6.4p2: 7684 // The declarator shall not specify a function or an array. 7685 // The type-specifier-seq shall not contain typedef and shall not declare a 7686 // new class or enumeration. 7687 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7688 "Parser allowed 'typedef' as storage class of condition decl."); 7689 7690 TagDecl *OwnedTag = 0; 7691 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7692 QualType Ty = TInfo->getType(); 7693 7694 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7695 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7696 // would be created and CXXConditionDeclExpr wants a VarDecl. 7697 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7698 << D.getSourceRange(); 7699 return DeclResult(); 7700 } else if (OwnedTag && OwnedTag->isDefinition()) { 7701 // The type-specifier-seq shall not declare a new class or enumeration. 7702 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7703 } 7704 7705 Decl *Dcl = ActOnDeclarator(S, D); 7706 if (!Dcl) 7707 return DeclResult(); 7708 7709 return Dcl; 7710} 7711 7712void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7713 bool DefinitionRequired) { 7714 // Ignore any vtable uses in unevaluated operands or for classes that do 7715 // not have a vtable. 7716 if (!Class->isDynamicClass() || Class->isDependentContext() || 7717 CurContext->isDependentContext() || 7718 ExprEvalContexts.back().Context == Unevaluated) 7719 return; 7720 7721 // Try to insert this class into the map. 7722 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7723 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7724 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7725 if (!Pos.second) { 7726 // If we already had an entry, check to see if we are promoting this vtable 7727 // to required a definition. If so, we need to reappend to the VTableUses 7728 // list, since we may have already processed the first entry. 7729 if (DefinitionRequired && !Pos.first->second) { 7730 Pos.first->second = true; 7731 } else { 7732 // Otherwise, we can early exit. 7733 return; 7734 } 7735 } 7736 7737 // Local classes need to have their virtual members marked 7738 // immediately. For all other classes, we mark their virtual members 7739 // at the end of the translation unit. 7740 if (Class->isLocalClass()) 7741 MarkVirtualMembersReferenced(Loc, Class); 7742 else 7743 VTableUses.push_back(std::make_pair(Class, Loc)); 7744} 7745 7746bool Sema::DefineUsedVTables() { 7747 if (VTableUses.empty()) 7748 return false; 7749 7750 // Note: The VTableUses vector could grow as a result of marking 7751 // the members of a class as "used", so we check the size each 7752 // time through the loop and prefer indices (with are stable) to 7753 // iterators (which are not). 7754 bool DefinedAnything = false; 7755 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7756 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7757 if (!Class) 7758 continue; 7759 7760 SourceLocation Loc = VTableUses[I].second; 7761 7762 // If this class has a key function, but that key function is 7763 // defined in another translation unit, we don't need to emit the 7764 // vtable even though we're using it. 7765 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7766 if (KeyFunction && !KeyFunction->hasBody()) { 7767 switch (KeyFunction->getTemplateSpecializationKind()) { 7768 case TSK_Undeclared: 7769 case TSK_ExplicitSpecialization: 7770 case TSK_ExplicitInstantiationDeclaration: 7771 // The key function is in another translation unit. 7772 continue; 7773 7774 case TSK_ExplicitInstantiationDefinition: 7775 case TSK_ImplicitInstantiation: 7776 // We will be instantiating the key function. 7777 break; 7778 } 7779 } else if (!KeyFunction) { 7780 // If we have a class with no key function that is the subject 7781 // of an explicit instantiation declaration, suppress the 7782 // vtable; it will live with the explicit instantiation 7783 // definition. 7784 bool IsExplicitInstantiationDeclaration 7785 = Class->getTemplateSpecializationKind() 7786 == TSK_ExplicitInstantiationDeclaration; 7787 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7788 REnd = Class->redecls_end(); 7789 R != REnd; ++R) { 7790 TemplateSpecializationKind TSK 7791 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7792 if (TSK == TSK_ExplicitInstantiationDeclaration) 7793 IsExplicitInstantiationDeclaration = true; 7794 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7795 IsExplicitInstantiationDeclaration = false; 7796 break; 7797 } 7798 } 7799 7800 if (IsExplicitInstantiationDeclaration) 7801 continue; 7802 } 7803 7804 // Mark all of the virtual members of this class as referenced, so 7805 // that we can build a vtable. Then, tell the AST consumer that a 7806 // vtable for this class is required. 7807 DefinedAnything = true; 7808 MarkVirtualMembersReferenced(Loc, Class); 7809 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7810 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7811 7812 // Optionally warn if we're emitting a weak vtable. 7813 if (Class->getLinkage() == ExternalLinkage && 7814 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7815 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7816 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7817 } 7818 } 7819 VTableUses.clear(); 7820 7821 return DefinedAnything; 7822} 7823 7824void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7825 const CXXRecordDecl *RD) { 7826 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7827 e = RD->method_end(); i != e; ++i) { 7828 CXXMethodDecl *MD = *i; 7829 7830 // C++ [basic.def.odr]p2: 7831 // [...] A virtual member function is used if it is not pure. [...] 7832 if (MD->isVirtual() && !MD->isPure()) 7833 MarkDeclarationReferenced(Loc, MD); 7834 } 7835 7836 // Only classes that have virtual bases need a VTT. 7837 if (RD->getNumVBases() == 0) 7838 return; 7839 7840 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7841 e = RD->bases_end(); i != e; ++i) { 7842 const CXXRecordDecl *Base = 7843 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7844 if (Base->getNumVBases() == 0) 7845 continue; 7846 MarkVirtualMembersReferenced(Loc, Base); 7847 } 7848} 7849 7850/// SetIvarInitializers - This routine builds initialization ASTs for the 7851/// Objective-C implementation whose ivars need be initialized. 7852void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7853 if (!getLangOptions().CPlusPlus) 7854 return; 7855 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7856 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7857 CollectIvarsToConstructOrDestruct(OID, ivars); 7858 if (ivars.empty()) 7859 return; 7860 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7861 for (unsigned i = 0; i < ivars.size(); i++) { 7862 FieldDecl *Field = ivars[i]; 7863 if (Field->isInvalidDecl()) 7864 continue; 7865 7866 CXXCtorInitializer *Member; 7867 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7868 InitializationKind InitKind = 7869 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7870 7871 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7872 ExprResult MemberInit = 7873 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7874 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7875 // Note, MemberInit could actually come back empty if no initialization 7876 // is required (e.g., because it would call a trivial default constructor) 7877 if (!MemberInit.get() || MemberInit.isInvalid()) 7878 continue; 7879 7880 Member = 7881 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7882 SourceLocation(), 7883 MemberInit.takeAs<Expr>(), 7884 SourceLocation()); 7885 AllToInit.push_back(Member); 7886 7887 // Be sure that the destructor is accessible and is marked as referenced. 7888 if (const RecordType *RecordTy 7889 = Context.getBaseElementType(Field->getType()) 7890 ->getAs<RecordType>()) { 7891 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7892 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7893 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7894 CheckDestructorAccess(Field->getLocation(), Destructor, 7895 PDiag(diag::err_access_dtor_ivar) 7896 << Context.getBaseElementType(Field->getType())); 7897 } 7898 } 7899 } 7900 ObjCImplementation->setIvarInitializers(Context, 7901 AllToInit.data(), AllToInit.size()); 7902 } 7903} 7904