SemaDeclCXX.cpp revision ebcbe1d3dc7d4f0c1f540a632fa0684dd0a857d5
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/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114bool 115Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 116 SourceLocation EqualLoc) { 117 if (RequireCompleteType(Param->getLocation(), Param->getType(), 118 diag::err_typecheck_decl_incomplete_type)) { 119 Param->setInvalidDecl(); 120 return true; 121 } 122 123 // C++ [dcl.fct.default]p5 124 // A default argument expression is implicitly converted (clause 125 // 4) to the parameter type. The default argument expression has 126 // the same semantic constraints as the initializer expression in 127 // a declaration of a variable of the parameter type, using the 128 // copy-initialization semantics (8.5). 129 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 130 Param); 131 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 132 EqualLoc); 133 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 134 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 135 MultiExprArg(*this, &Arg, 1)); 136 if (Result.isInvalid()) 137 return true; 138 Arg = Result.takeAs<Expr>(); 139 140 CheckImplicitConversions(Arg, EqualLoc); 141 Arg = MaybeCreateExprWithCleanups(Arg); 142 143 // Okay: add the default argument to the parameter 144 Param->setDefaultArg(Arg); 145 146 // We have already instantiated this parameter; provide each of the 147 // instantiations with the uninstantiated default argument. 148 UnparsedDefaultArgInstantiationsMap::iterator InstPos 149 = UnparsedDefaultArgInstantiations.find(Param); 150 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 151 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 152 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 153 154 // We're done tracking this parameter's instantiations. 155 UnparsedDefaultArgInstantiations.erase(InstPos); 156 } 157 158 return false; 159} 160 161/// ActOnParamDefaultArgument - Check whether the default argument 162/// provided for a function parameter is well-formed. If so, attach it 163/// to the parameter declaration. 164void 165Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 166 Expr *DefaultArg) { 167 if (!param || !DefaultArg) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param); 171 UnparsedDefaultArgLocs.erase(Param); 172 173 // Default arguments are only permitted in C++ 174 if (!getLangOptions().CPlusPlus) { 175 Diag(EqualLoc, diag::err_param_default_argument) 176 << DefaultArg->getSourceRange(); 177 Param->setInvalidDecl(); 178 return; 179 } 180 181 // Check for unexpanded parameter packs. 182 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 183 Param->setInvalidDecl(); 184 return; 185 } 186 187 // Check that the default argument is well-formed 188 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 189 if (DefaultArgChecker.Visit(DefaultArg)) { 190 Param->setInvalidDecl(); 191 return; 192 } 193 194 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 195} 196 197/// ActOnParamUnparsedDefaultArgument - We've seen a default 198/// argument for a function parameter, but we can't parse it yet 199/// because we're inside a class definition. Note that this default 200/// argument will be parsed later. 201void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 202 SourceLocation EqualLoc, 203 SourceLocation ArgLoc) { 204 if (!param) 205 return; 206 207 ParmVarDecl *Param = cast<ParmVarDecl>(param); 208 if (Param) 209 Param->setUnparsedDefaultArg(); 210 211 UnparsedDefaultArgLocs[Param] = ArgLoc; 212} 213 214/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 215/// the default argument for the parameter param failed. 216void Sema::ActOnParamDefaultArgumentError(Decl *param) { 217 if (!param) 218 return; 219 220 ParmVarDecl *Param = cast<ParmVarDecl>(param); 221 222 Param->setInvalidDecl(); 223 224 UnparsedDefaultArgLocs.erase(Param); 225} 226 227/// CheckExtraCXXDefaultArguments - Check for any extra default 228/// arguments in the declarator, which is not a function declaration 229/// or definition and therefore is not permitted to have default 230/// arguments. This routine should be invoked for every declarator 231/// that is not a function declaration or definition. 232void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 233 // C++ [dcl.fct.default]p3 234 // A default argument expression shall be specified only in the 235 // parameter-declaration-clause of a function declaration or in a 236 // template-parameter (14.1). It shall not be specified for a 237 // parameter pack. If it is specified in a 238 // parameter-declaration-clause, it shall not occur within a 239 // declarator or abstract-declarator of a parameter-declaration. 240 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 241 DeclaratorChunk &chunk = D.getTypeObject(i); 242 if (chunk.Kind == DeclaratorChunk::Function) { 243 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 244 ParmVarDecl *Param = 245 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 246 if (Param->hasUnparsedDefaultArg()) { 247 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 248 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 249 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 250 delete Toks; 251 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 252 } else if (Param->getDefaultArg()) { 253 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 254 << Param->getDefaultArg()->getSourceRange(); 255 Param->setDefaultArg(0); 256 } 257 } 258 } 259 } 260} 261 262// MergeCXXFunctionDecl - Merge two declarations of the same C++ 263// function, once we already know that they have the same 264// type. Subroutine of MergeFunctionDecl. Returns true if there was an 265// error, false otherwise. 266bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 267 bool Invalid = false; 268 269 // C++ [dcl.fct.default]p4: 270 // For non-template functions, default arguments can be added in 271 // later declarations of a function in the same 272 // scope. Declarations in different scopes have completely 273 // distinct sets of default arguments. That is, declarations in 274 // inner scopes do not acquire default arguments from 275 // declarations in outer scopes, and vice versa. In a given 276 // function declaration, all parameters subsequent to a 277 // parameter with a default argument shall have default 278 // arguments supplied in this or previous declarations. A 279 // default argument shall not be redefined by a later 280 // declaration (not even to the same value). 281 // 282 // C++ [dcl.fct.default]p6: 283 // Except for member functions of class templates, the default arguments 284 // in a member function definition that appears outside of the class 285 // definition are added to the set of default arguments provided by the 286 // member function declaration in the class definition. 287 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 288 ParmVarDecl *OldParam = Old->getParamDecl(p); 289 ParmVarDecl *NewParam = New->getParamDecl(p); 290 291 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 292 293 unsigned DiagDefaultParamID = 294 diag::err_param_default_argument_redefinition; 295 296 // MSVC accepts that default parameters be redefined for member functions 297 // of template class. The new default parameter's value is ignored. 298 Invalid = true; 299 if (getLangOptions().Microsoft) { 300 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 301 if (MD && MD->getParent()->getDescribedClassTemplate()) { 302 // Merge the old default argument into the new parameter. 303 NewParam->setHasInheritedDefaultArg(); 304 if (OldParam->hasUninstantiatedDefaultArg()) 305 NewParam->setUninstantiatedDefaultArg( 306 OldParam->getUninstantiatedDefaultArg()); 307 else 308 NewParam->setDefaultArg(OldParam->getInit()); 309 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 310 Invalid = false; 311 } 312 } 313 314 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 315 // hint here. Alternatively, we could walk the type-source information 316 // for NewParam to find the last source location in the type... but it 317 // isn't worth the effort right now. This is the kind of test case that 318 // is hard to get right: 319 // int f(int); 320 // void g(int (*fp)(int) = f); 321 // void g(int (*fp)(int) = &f); 322 Diag(NewParam->getLocation(), DiagDefaultParamID) 323 << NewParam->getDefaultArgRange(); 324 325 // Look for the function declaration where the default argument was 326 // actually written, which may be a declaration prior to Old. 327 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 328 Older; Older = Older->getPreviousDeclaration()) { 329 if (!Older->getParamDecl(p)->hasDefaultArg()) 330 break; 331 332 OldParam = Older->getParamDecl(p); 333 } 334 335 Diag(OldParam->getLocation(), diag::note_previous_definition) 336 << OldParam->getDefaultArgRange(); 337 } else if (OldParam->hasDefaultArg()) { 338 // Merge the old default argument into the new parameter. 339 // It's important to use getInit() here; getDefaultArg() 340 // strips off any top-level ExprWithCleanups. 341 NewParam->setHasInheritedDefaultArg(); 342 if (OldParam->hasUninstantiatedDefaultArg()) 343 NewParam->setUninstantiatedDefaultArg( 344 OldParam->getUninstantiatedDefaultArg()); 345 else 346 NewParam->setDefaultArg(OldParam->getInit()); 347 } else if (NewParam->hasDefaultArg()) { 348 if (New->getDescribedFunctionTemplate()) { 349 // Paragraph 4, quoted above, only applies to non-template functions. 350 Diag(NewParam->getLocation(), 351 diag::err_param_default_argument_template_redecl) 352 << NewParam->getDefaultArgRange(); 353 Diag(Old->getLocation(), diag::note_template_prev_declaration) 354 << false; 355 } else if (New->getTemplateSpecializationKind() 356 != TSK_ImplicitInstantiation && 357 New->getTemplateSpecializationKind() != TSK_Undeclared) { 358 // C++ [temp.expr.spec]p21: 359 // Default function arguments shall not be specified in a declaration 360 // or a definition for one of the following explicit specializations: 361 // - the explicit specialization of a function template; 362 // - the explicit specialization of a member function template; 363 // - the explicit specialization of a member function of a class 364 // template where the class template specialization to which the 365 // member function specialization belongs is implicitly 366 // instantiated. 367 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 368 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 369 << New->getDeclName() 370 << NewParam->getDefaultArgRange(); 371 } else if (New->getDeclContext()->isDependentContext()) { 372 // C++ [dcl.fct.default]p6 (DR217): 373 // Default arguments for a member function of a class template shall 374 // be specified on the initial declaration of the member function 375 // within the class template. 376 // 377 // Reading the tea leaves a bit in DR217 and its reference to DR205 378 // leads me to the conclusion that one cannot add default function 379 // arguments for an out-of-line definition of a member function of a 380 // dependent type. 381 int WhichKind = 2; 382 if (CXXRecordDecl *Record 383 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 384 if (Record->getDescribedClassTemplate()) 385 WhichKind = 0; 386 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 387 WhichKind = 1; 388 else 389 WhichKind = 2; 390 } 391 392 Diag(NewParam->getLocation(), 393 diag::err_param_default_argument_member_template_redecl) 394 << WhichKind 395 << NewParam->getDefaultArgRange(); 396 } 397 } 398 } 399 400 if (CheckEquivalentExceptionSpec(Old, New)) 401 Invalid = true; 402 403 return Invalid; 404} 405 406/// \brief Merge the exception specifications of two variable declarations. 407/// 408/// This is called when there's a redeclaration of a VarDecl. The function 409/// checks if the redeclaration might have an exception specification and 410/// validates compatibility and merges the specs if necessary. 411void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 412 // Shortcut if exceptions are disabled. 413 if (!getLangOptions().CXXExceptions) 414 return; 415 416 assert(Context.hasSameType(New->getType(), Old->getType()) && 417 "Should only be called if types are otherwise the same."); 418 419 QualType NewType = New->getType(); 420 QualType OldType = Old->getType(); 421 422 // We're only interested in pointers and references to functions, as well 423 // as pointers to member functions. 424 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 425 NewType = R->getPointeeType(); 426 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 427 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 428 NewType = P->getPointeeType(); 429 OldType = OldType->getAs<PointerType>()->getPointeeType(); 430 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 431 NewType = M->getPointeeType(); 432 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 433 } 434 435 if (!NewType->isFunctionProtoType()) 436 return; 437 438 // There's lots of special cases for functions. For function pointers, system 439 // libraries are hopefully not as broken so that we don't need these 440 // workarounds. 441 if (CheckEquivalentExceptionSpec( 442 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 443 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 444 New->setInvalidDecl(); 445 } 446} 447 448/// CheckCXXDefaultArguments - Verify that the default arguments for a 449/// function declaration are well-formed according to C++ 450/// [dcl.fct.default]. 451void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 452 unsigned NumParams = FD->getNumParams(); 453 unsigned p; 454 455 // Find first parameter with a default argument 456 for (p = 0; p < NumParams; ++p) { 457 ParmVarDecl *Param = FD->getParamDecl(p); 458 if (Param->hasDefaultArg()) 459 break; 460 } 461 462 // C++ [dcl.fct.default]p4: 463 // In a given function declaration, all parameters 464 // subsequent to a parameter with a default argument shall 465 // have default arguments supplied in this or previous 466 // declarations. A default argument shall not be redefined 467 // by a later declaration (not even to the same value). 468 unsigned LastMissingDefaultArg = 0; 469 for (; p < NumParams; ++p) { 470 ParmVarDecl *Param = FD->getParamDecl(p); 471 if (!Param->hasDefaultArg()) { 472 if (Param->isInvalidDecl()) 473 /* We already complained about this parameter. */; 474 else if (Param->getIdentifier()) 475 Diag(Param->getLocation(), 476 diag::err_param_default_argument_missing_name) 477 << Param->getIdentifier(); 478 else 479 Diag(Param->getLocation(), 480 diag::err_param_default_argument_missing); 481 482 LastMissingDefaultArg = p; 483 } 484 } 485 486 if (LastMissingDefaultArg > 0) { 487 // Some default arguments were missing. Clear out all of the 488 // default arguments up to (and including) the last missing 489 // default argument, so that we leave the function parameters 490 // in a semantically valid state. 491 for (p = 0; p <= LastMissingDefaultArg; ++p) { 492 ParmVarDecl *Param = FD->getParamDecl(p); 493 if (Param->hasDefaultArg()) { 494 Param->setDefaultArg(0); 495 } 496 } 497 } 498} 499 500/// isCurrentClassName - Determine whether the identifier II is the 501/// name of the class type currently being defined. In the case of 502/// nested classes, this will only return true if II is the name of 503/// the innermost class. 504bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 505 const CXXScopeSpec *SS) { 506 assert(getLangOptions().CPlusPlus && "No class names in C!"); 507 508 CXXRecordDecl *CurDecl; 509 if (SS && SS->isSet() && !SS->isInvalid()) { 510 DeclContext *DC = computeDeclContext(*SS, true); 511 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 512 } else 513 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 514 515 if (CurDecl && CurDecl->getIdentifier()) 516 return &II == CurDecl->getIdentifier(); 517 else 518 return false; 519} 520 521/// \brief Check the validity of a C++ base class specifier. 522/// 523/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 524/// and returns NULL otherwise. 525CXXBaseSpecifier * 526Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 527 SourceRange SpecifierRange, 528 bool Virtual, AccessSpecifier Access, 529 TypeSourceInfo *TInfo, 530 SourceLocation EllipsisLoc) { 531 QualType BaseType = TInfo->getType(); 532 533 // C++ [class.union]p1: 534 // A union shall not have base classes. 535 if (Class->isUnion()) { 536 Diag(Class->getLocation(), diag::err_base_clause_on_union) 537 << SpecifierRange; 538 return 0; 539 } 540 541 if (EllipsisLoc.isValid() && 542 !TInfo->getType()->containsUnexpandedParameterPack()) { 543 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 544 << TInfo->getTypeLoc().getSourceRange(); 545 EllipsisLoc = SourceLocation(); 546 } 547 548 if (BaseType->isDependentType()) 549 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 550 Class->getTagKind() == TTK_Class, 551 Access, TInfo, EllipsisLoc); 552 553 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 554 555 // Base specifiers must be record types. 556 if (!BaseType->isRecordType()) { 557 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 558 return 0; 559 } 560 561 // C++ [class.union]p1: 562 // A union shall not be used as a base class. 563 if (BaseType->isUnionType()) { 564 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 565 return 0; 566 } 567 568 // C++ [class.derived]p2: 569 // The class-name in a base-specifier shall not be an incompletely 570 // defined class. 571 if (RequireCompleteType(BaseLoc, BaseType, 572 PDiag(diag::err_incomplete_base_class) 573 << SpecifierRange)) { 574 Class->setInvalidDecl(); 575 return 0; 576 } 577 578 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 579 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 580 assert(BaseDecl && "Record type has no declaration"); 581 BaseDecl = BaseDecl->getDefinition(); 582 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 583 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 584 assert(CXXBaseDecl && "Base type is not a C++ type"); 585 586 // C++ [class]p3: 587 // If a class is marked final and it appears as a base-type-specifier in 588 // base-clause, the program is ill-formed. 589 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 590 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 591 << CXXBaseDecl->getDeclName(); 592 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 593 << CXXBaseDecl->getDeclName(); 594 return 0; 595 } 596 597 if (BaseDecl->isInvalidDecl()) 598 Class->setInvalidDecl(); 599 600 // Create the base specifier. 601 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 602 Class->getTagKind() == TTK_Class, 603 Access, TInfo, EllipsisLoc); 604} 605 606/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 607/// one entry in the base class list of a class specifier, for 608/// example: 609/// class foo : public bar, virtual private baz { 610/// 'public bar' and 'virtual private baz' are each base-specifiers. 611BaseResult 612Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 613 bool Virtual, AccessSpecifier Access, 614 ParsedType basetype, SourceLocation BaseLoc, 615 SourceLocation EllipsisLoc) { 616 if (!classdecl) 617 return true; 618 619 AdjustDeclIfTemplate(classdecl); 620 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 621 if (!Class) 622 return true; 623 624 TypeSourceInfo *TInfo = 0; 625 GetTypeFromParser(basetype, &TInfo); 626 627 if (EllipsisLoc.isInvalid() && 628 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 629 UPPC_BaseType)) 630 return true; 631 632 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 633 Virtual, Access, TInfo, 634 EllipsisLoc)) 635 return BaseSpec; 636 637 return true; 638} 639 640/// \brief Performs the actual work of attaching the given base class 641/// specifiers to a C++ class. 642bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 643 unsigned NumBases) { 644 if (NumBases == 0) 645 return false; 646 647 // Used to keep track of which base types we have already seen, so 648 // that we can properly diagnose redundant direct base types. Note 649 // that the key is always the unqualified canonical type of the base 650 // class. 651 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 652 653 // Copy non-redundant base specifiers into permanent storage. 654 unsigned NumGoodBases = 0; 655 bool Invalid = false; 656 for (unsigned idx = 0; idx < NumBases; ++idx) { 657 QualType NewBaseType 658 = Context.getCanonicalType(Bases[idx]->getType()); 659 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 660 if (!Class->hasObjectMember()) { 661 if (const RecordType *FDTTy = 662 NewBaseType.getTypePtr()->getAs<RecordType>()) 663 if (FDTTy->getDecl()->hasObjectMember()) 664 Class->setHasObjectMember(true); 665 } 666 667 if (KnownBaseTypes[NewBaseType]) { 668 // C++ [class.mi]p3: 669 // A class shall not be specified as a direct base class of a 670 // derived class more than once. 671 Diag(Bases[idx]->getSourceRange().getBegin(), 672 diag::err_duplicate_base_class) 673 << KnownBaseTypes[NewBaseType]->getType() 674 << Bases[idx]->getSourceRange(); 675 676 // Delete the duplicate base class specifier; we're going to 677 // overwrite its pointer later. 678 Context.Deallocate(Bases[idx]); 679 680 Invalid = true; 681 } else { 682 // Okay, add this new base class. 683 KnownBaseTypes[NewBaseType] = Bases[idx]; 684 Bases[NumGoodBases++] = Bases[idx]; 685 } 686 } 687 688 // Attach the remaining base class specifiers to the derived class. 689 Class->setBases(Bases, NumGoodBases); 690 691 // Delete the remaining (good) base class specifiers, since their 692 // data has been copied into the CXXRecordDecl. 693 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 694 Context.Deallocate(Bases[idx]); 695 696 return Invalid; 697} 698 699/// ActOnBaseSpecifiers - Attach the given base specifiers to the 700/// class, after checking whether there are any duplicate base 701/// classes. 702void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 703 unsigned NumBases) { 704 if (!ClassDecl || !Bases || !NumBases) 705 return; 706 707 AdjustDeclIfTemplate(ClassDecl); 708 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 709 (CXXBaseSpecifier**)(Bases), NumBases); 710} 711 712static CXXRecordDecl *GetClassForType(QualType T) { 713 if (const RecordType *RT = T->getAs<RecordType>()) 714 return cast<CXXRecordDecl>(RT->getDecl()); 715 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 716 return ICT->getDecl(); 717 else 718 return 0; 719} 720 721/// \brief Determine whether the type \p Derived is a C++ class that is 722/// derived from the type \p Base. 723bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 724 if (!getLangOptions().CPlusPlus) 725 return false; 726 727 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 728 if (!DerivedRD) 729 return false; 730 731 CXXRecordDecl *BaseRD = GetClassForType(Base); 732 if (!BaseRD) 733 return false; 734 735 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 736 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 737} 738 739/// \brief Determine whether the type \p Derived is a C++ class that is 740/// derived from the type \p Base. 741bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 742 if (!getLangOptions().CPlusPlus) 743 return false; 744 745 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 746 if (!DerivedRD) 747 return false; 748 749 CXXRecordDecl *BaseRD = GetClassForType(Base); 750 if (!BaseRD) 751 return false; 752 753 return DerivedRD->isDerivedFrom(BaseRD, Paths); 754} 755 756void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 757 CXXCastPath &BasePathArray) { 758 assert(BasePathArray.empty() && "Base path array must be empty!"); 759 assert(Paths.isRecordingPaths() && "Must record paths!"); 760 761 const CXXBasePath &Path = Paths.front(); 762 763 // We first go backward and check if we have a virtual base. 764 // FIXME: It would be better if CXXBasePath had the base specifier for 765 // the nearest virtual base. 766 unsigned Start = 0; 767 for (unsigned I = Path.size(); I != 0; --I) { 768 if (Path[I - 1].Base->isVirtual()) { 769 Start = I - 1; 770 break; 771 } 772 } 773 774 // Now add all bases. 775 for (unsigned I = Start, E = Path.size(); I != E; ++I) 776 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 777} 778 779/// \brief Determine whether the given base path includes a virtual 780/// base class. 781bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 782 for (CXXCastPath::const_iterator B = BasePath.begin(), 783 BEnd = BasePath.end(); 784 B != BEnd; ++B) 785 if ((*B)->isVirtual()) 786 return true; 787 788 return false; 789} 790 791/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 792/// conversion (where Derived and Base are class types) is 793/// well-formed, meaning that the conversion is unambiguous (and 794/// that all of the base classes are accessible). Returns true 795/// and emits a diagnostic if the code is ill-formed, returns false 796/// otherwise. Loc is the location where this routine should point to 797/// if there is an error, and Range is the source range to highlight 798/// if there is an error. 799bool 800Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 801 unsigned InaccessibleBaseID, 802 unsigned AmbigiousBaseConvID, 803 SourceLocation Loc, SourceRange Range, 804 DeclarationName Name, 805 CXXCastPath *BasePath) { 806 // First, determine whether the path from Derived to Base is 807 // ambiguous. This is slightly more expensive than checking whether 808 // the Derived to Base conversion exists, because here we need to 809 // explore multiple paths to determine if there is an ambiguity. 810 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 811 /*DetectVirtual=*/false); 812 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 813 assert(DerivationOkay && 814 "Can only be used with a derived-to-base conversion"); 815 (void)DerivationOkay; 816 817 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 818 if (InaccessibleBaseID) { 819 // Check that the base class can be accessed. 820 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 821 InaccessibleBaseID)) { 822 case AR_inaccessible: 823 return true; 824 case AR_accessible: 825 case AR_dependent: 826 case AR_delayed: 827 break; 828 } 829 } 830 831 // Build a base path if necessary. 832 if (BasePath) 833 BuildBasePathArray(Paths, *BasePath); 834 return false; 835 } 836 837 // We know that the derived-to-base conversion is ambiguous, and 838 // we're going to produce a diagnostic. Perform the derived-to-base 839 // search just one more time to compute all of the possible paths so 840 // that we can print them out. This is more expensive than any of 841 // the previous derived-to-base checks we've done, but at this point 842 // performance isn't as much of an issue. 843 Paths.clear(); 844 Paths.setRecordingPaths(true); 845 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 846 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 847 (void)StillOkay; 848 849 // Build up a textual representation of the ambiguous paths, e.g., 850 // D -> B -> A, that will be used to illustrate the ambiguous 851 // conversions in the diagnostic. We only print one of the paths 852 // to each base class subobject. 853 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 854 855 Diag(Loc, AmbigiousBaseConvID) 856 << Derived << Base << PathDisplayStr << Range << Name; 857 return true; 858} 859 860bool 861Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 862 SourceLocation Loc, SourceRange Range, 863 CXXCastPath *BasePath, 864 bool IgnoreAccess) { 865 return CheckDerivedToBaseConversion(Derived, Base, 866 IgnoreAccess ? 0 867 : diag::err_upcast_to_inaccessible_base, 868 diag::err_ambiguous_derived_to_base_conv, 869 Loc, Range, DeclarationName(), 870 BasePath); 871} 872 873 874/// @brief Builds a string representing ambiguous paths from a 875/// specific derived class to different subobjects of the same base 876/// class. 877/// 878/// This function builds a string that can be used in error messages 879/// to show the different paths that one can take through the 880/// inheritance hierarchy to go from the derived class to different 881/// subobjects of a base class. The result looks something like this: 882/// @code 883/// struct D -> struct B -> struct A 884/// struct D -> struct C -> struct A 885/// @endcode 886std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 887 std::string PathDisplayStr; 888 std::set<unsigned> DisplayedPaths; 889 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 890 Path != Paths.end(); ++Path) { 891 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 892 // We haven't displayed a path to this particular base 893 // class subobject yet. 894 PathDisplayStr += "\n "; 895 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 896 for (CXXBasePath::const_iterator Element = Path->begin(); 897 Element != Path->end(); ++Element) 898 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 899 } 900 } 901 902 return PathDisplayStr; 903} 904 905//===----------------------------------------------------------------------===// 906// C++ class member Handling 907//===----------------------------------------------------------------------===// 908 909/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 910Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 911 SourceLocation ASLoc, 912 SourceLocation ColonLoc) { 913 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 914 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 915 ASLoc, ColonLoc); 916 CurContext->addHiddenDecl(ASDecl); 917 return ASDecl; 918} 919 920/// CheckOverrideControl - Check C++0x override control semantics. 921void Sema::CheckOverrideControl(const Decl *D) { 922 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 923 if (!MD || !MD->isVirtual()) 924 return; 925 926 if (MD->isDependentContext()) 927 return; 928 929 // C++0x [class.virtual]p3: 930 // If a virtual function is marked with the virt-specifier override and does 931 // not override a member function of a base class, 932 // the program is ill-formed. 933 bool HasOverriddenMethods = 934 MD->begin_overridden_methods() != MD->end_overridden_methods(); 935 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 936 Diag(MD->getLocation(), 937 diag::err_function_marked_override_not_overriding) 938 << MD->getDeclName(); 939 return; 940 } 941} 942 943/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 944/// function overrides a virtual member function marked 'final', according to 945/// C++0x [class.virtual]p3. 946bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 947 const CXXMethodDecl *Old) { 948 if (!Old->hasAttr<FinalAttr>()) 949 return false; 950 951 Diag(New->getLocation(), diag::err_final_function_overridden) 952 << New->getDeclName(); 953 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 954 return true; 955} 956 957/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 958/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 959/// bitfield width if there is one and 'InitExpr' specifies the initializer if 960/// any. 961Decl * 962Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 963 MultiTemplateParamsArg TemplateParameterLists, 964 ExprTy *BW, const VirtSpecifiers &VS, 965 ExprTy *InitExpr, bool IsDefinition, 966 bool Deleted) { 967 const DeclSpec &DS = D.getDeclSpec(); 968 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 969 DeclarationName Name = NameInfo.getName(); 970 SourceLocation Loc = NameInfo.getLoc(); 971 972 // For anonymous bitfields, the location should point to the type. 973 if (Loc.isInvalid()) 974 Loc = D.getSourceRange().getBegin(); 975 976 Expr *BitWidth = static_cast<Expr*>(BW); 977 Expr *Init = static_cast<Expr*>(InitExpr); 978 979 assert(isa<CXXRecordDecl>(CurContext)); 980 assert(!DS.isFriendSpecified()); 981 982 bool isFunc = false; 983 if (D.isFunctionDeclarator()) 984 isFunc = true; 985 else if (D.getNumTypeObjects() == 0 && 986 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 987 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 988 isFunc = TDType->isFunctionType(); 989 } 990 991 // C++ 9.2p6: A member shall not be declared to have automatic storage 992 // duration (auto, register) or with the extern storage-class-specifier. 993 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 994 // data members and cannot be applied to names declared const or static, 995 // and cannot be applied to reference members. 996 switch (DS.getStorageClassSpec()) { 997 case DeclSpec::SCS_unspecified: 998 case DeclSpec::SCS_typedef: 999 case DeclSpec::SCS_static: 1000 // FALL THROUGH. 1001 break; 1002 case DeclSpec::SCS_mutable: 1003 if (isFunc) { 1004 if (DS.getStorageClassSpecLoc().isValid()) 1005 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1006 else 1007 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1008 1009 // FIXME: It would be nicer if the keyword was ignored only for this 1010 // declarator. Otherwise we could get follow-up errors. 1011 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1012 } 1013 break; 1014 default: 1015 if (DS.getStorageClassSpecLoc().isValid()) 1016 Diag(DS.getStorageClassSpecLoc(), 1017 diag::err_storageclass_invalid_for_member); 1018 else 1019 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1020 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1021 } 1022 1023 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1024 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1025 !isFunc); 1026 1027 Decl *Member; 1028 if (isInstField) { 1029 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1030 1031 1032 if (SS.isSet() && !SS.isInvalid()) { 1033 // The user provided a superfluous scope specifier inside a class 1034 // definition: 1035 // 1036 // class X { 1037 // int X::member; 1038 // }; 1039 DeclContext *DC = 0; 1040 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1041 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1042 << Name << FixItHint::CreateRemoval(SS.getRange()); 1043 else 1044 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1045 << Name << SS.getRange(); 1046 1047 SS.clear(); 1048 } 1049 1050 // FIXME: Check for template parameters! 1051 // FIXME: Check that the name is an identifier! 1052 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1053 AS); 1054 assert(Member && "HandleField never returns null"); 1055 } else { 1056 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1057 if (!Member) { 1058 return 0; 1059 } 1060 1061 // Non-instance-fields can't have a bitfield. 1062 if (BitWidth) { 1063 if (Member->isInvalidDecl()) { 1064 // don't emit another diagnostic. 1065 } else if (isa<VarDecl>(Member)) { 1066 // C++ 9.6p3: A bit-field shall not be a static member. 1067 // "static member 'A' cannot be a bit-field" 1068 Diag(Loc, diag::err_static_not_bitfield) 1069 << Name << BitWidth->getSourceRange(); 1070 } else if (isa<TypedefDecl>(Member)) { 1071 // "typedef member 'x' cannot be a bit-field" 1072 Diag(Loc, diag::err_typedef_not_bitfield) 1073 << Name << BitWidth->getSourceRange(); 1074 } else { 1075 // A function typedef ("typedef int f(); f a;"). 1076 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1077 Diag(Loc, diag::err_not_integral_type_bitfield) 1078 << Name << cast<ValueDecl>(Member)->getType() 1079 << BitWidth->getSourceRange(); 1080 } 1081 1082 BitWidth = 0; 1083 Member->setInvalidDecl(); 1084 } 1085 1086 Member->setAccess(AS); 1087 1088 // If we have declared a member function template, set the access of the 1089 // templated declaration as well. 1090 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1091 FunTmpl->getTemplatedDecl()->setAccess(AS); 1092 } 1093 1094 if (VS.isOverrideSpecified()) { 1095 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1096 if (!MD || !MD->isVirtual()) { 1097 Diag(Member->getLocStart(), 1098 diag::override_keyword_only_allowed_on_virtual_member_functions) 1099 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1100 } else 1101 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1102 } 1103 if (VS.isFinalSpecified()) { 1104 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1105 if (!MD || !MD->isVirtual()) { 1106 Diag(Member->getLocStart(), 1107 diag::override_keyword_only_allowed_on_virtual_member_functions) 1108 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1109 } else 1110 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1111 } 1112 1113 if (VS.getLastLocation().isValid()) { 1114 // Update the end location of a method that has a virt-specifiers. 1115 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1116 MD->setRangeEnd(VS.getLastLocation()); 1117 } 1118 1119 CheckOverrideControl(Member); 1120 1121 assert((Name || isInstField) && "No identifier for non-field ?"); 1122 1123 if (Init) 1124 AddInitializerToDecl(Member, Init, false, 1125 DS.getTypeSpecType() == DeclSpec::TST_auto); 1126 if (Deleted) // FIXME: Source location is not very good. 1127 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1128 1129 FinalizeDeclaration(Member); 1130 1131 if (isInstField) 1132 FieldCollector->Add(cast<FieldDecl>(Member)); 1133 return Member; 1134} 1135 1136/// \brief Find the direct and/or virtual base specifiers that 1137/// correspond to the given base type, for use in base initialization 1138/// within a constructor. 1139static bool FindBaseInitializer(Sema &SemaRef, 1140 CXXRecordDecl *ClassDecl, 1141 QualType BaseType, 1142 const CXXBaseSpecifier *&DirectBaseSpec, 1143 const CXXBaseSpecifier *&VirtualBaseSpec) { 1144 // First, check for a direct base class. 1145 DirectBaseSpec = 0; 1146 for (CXXRecordDecl::base_class_const_iterator Base 1147 = ClassDecl->bases_begin(); 1148 Base != ClassDecl->bases_end(); ++Base) { 1149 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1150 // We found a direct base of this type. That's what we're 1151 // initializing. 1152 DirectBaseSpec = &*Base; 1153 break; 1154 } 1155 } 1156 1157 // Check for a virtual base class. 1158 // FIXME: We might be able to short-circuit this if we know in advance that 1159 // there are no virtual bases. 1160 VirtualBaseSpec = 0; 1161 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1162 // We haven't found a base yet; search the class hierarchy for a 1163 // virtual base class. 1164 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1165 /*DetectVirtual=*/false); 1166 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1167 BaseType, Paths)) { 1168 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1169 Path != Paths.end(); ++Path) { 1170 if (Path->back().Base->isVirtual()) { 1171 VirtualBaseSpec = Path->back().Base; 1172 break; 1173 } 1174 } 1175 } 1176 } 1177 1178 return DirectBaseSpec || VirtualBaseSpec; 1179} 1180 1181/// ActOnMemInitializer - Handle a C++ member initializer. 1182MemInitResult 1183Sema::ActOnMemInitializer(Decl *ConstructorD, 1184 Scope *S, 1185 CXXScopeSpec &SS, 1186 IdentifierInfo *MemberOrBase, 1187 ParsedType TemplateTypeTy, 1188 SourceLocation IdLoc, 1189 SourceLocation LParenLoc, 1190 ExprTy **Args, unsigned NumArgs, 1191 SourceLocation RParenLoc, 1192 SourceLocation EllipsisLoc) { 1193 if (!ConstructorD) 1194 return true; 1195 1196 AdjustDeclIfTemplate(ConstructorD); 1197 1198 CXXConstructorDecl *Constructor 1199 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1200 if (!Constructor) { 1201 // The user wrote a constructor initializer on a function that is 1202 // not a C++ constructor. Ignore the error for now, because we may 1203 // have more member initializers coming; we'll diagnose it just 1204 // once in ActOnMemInitializers. 1205 return true; 1206 } 1207 1208 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1209 1210 // C++ [class.base.init]p2: 1211 // Names in a mem-initializer-id are looked up in the scope of the 1212 // constructor's class and, if not found in that scope, are looked 1213 // up in the scope containing the constructor's definition. 1214 // [Note: if the constructor's class contains a member with the 1215 // same name as a direct or virtual base class of the class, a 1216 // mem-initializer-id naming the member or base class and composed 1217 // of a single identifier refers to the class member. A 1218 // mem-initializer-id for the hidden base class may be specified 1219 // using a qualified name. ] 1220 if (!SS.getScopeRep() && !TemplateTypeTy) { 1221 // Look for a member, first. 1222 FieldDecl *Member = 0; 1223 DeclContext::lookup_result Result 1224 = ClassDecl->lookup(MemberOrBase); 1225 if (Result.first != Result.second) { 1226 Member = dyn_cast<FieldDecl>(*Result.first); 1227 1228 if (Member) { 1229 if (EllipsisLoc.isValid()) 1230 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1231 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1232 1233 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1234 LParenLoc, RParenLoc); 1235 } 1236 1237 // Handle anonymous union case. 1238 if (IndirectFieldDecl* IndirectField 1239 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1240 if (EllipsisLoc.isValid()) 1241 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1242 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1243 1244 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1245 NumArgs, IdLoc, 1246 LParenLoc, RParenLoc); 1247 } 1248 } 1249 } 1250 // It didn't name a member, so see if it names a class. 1251 QualType BaseType; 1252 TypeSourceInfo *TInfo = 0; 1253 1254 if (TemplateTypeTy) { 1255 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1256 } else { 1257 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1258 LookupParsedName(R, S, &SS); 1259 1260 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1261 if (!TyD) { 1262 if (R.isAmbiguous()) return true; 1263 1264 // We don't want access-control diagnostics here. 1265 R.suppressDiagnostics(); 1266 1267 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1268 bool NotUnknownSpecialization = false; 1269 DeclContext *DC = computeDeclContext(SS, false); 1270 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1271 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1272 1273 if (!NotUnknownSpecialization) { 1274 // When the scope specifier can refer to a member of an unknown 1275 // specialization, we take it as a type name. 1276 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1277 SS.getWithLocInContext(Context), 1278 *MemberOrBase, IdLoc); 1279 if (BaseType.isNull()) 1280 return true; 1281 1282 R.clear(); 1283 R.setLookupName(MemberOrBase); 1284 } 1285 } 1286 1287 // If no results were found, try to correct typos. 1288 if (R.empty() && BaseType.isNull() && 1289 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1290 R.isSingleResult()) { 1291 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1292 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1293 // We have found a non-static data member with a similar 1294 // name to what was typed; complain and initialize that 1295 // member. 1296 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1297 << MemberOrBase << true << R.getLookupName() 1298 << FixItHint::CreateReplacement(R.getNameLoc(), 1299 R.getLookupName().getAsString()); 1300 Diag(Member->getLocation(), diag::note_previous_decl) 1301 << Member->getDeclName(); 1302 1303 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1304 LParenLoc, RParenLoc); 1305 } 1306 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1307 const CXXBaseSpecifier *DirectBaseSpec; 1308 const CXXBaseSpecifier *VirtualBaseSpec; 1309 if (FindBaseInitializer(*this, ClassDecl, 1310 Context.getTypeDeclType(Type), 1311 DirectBaseSpec, VirtualBaseSpec)) { 1312 // We have found a direct or virtual base class with a 1313 // similar name to what was typed; complain and initialize 1314 // that base class. 1315 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1316 << MemberOrBase << false << R.getLookupName() 1317 << FixItHint::CreateReplacement(R.getNameLoc(), 1318 R.getLookupName().getAsString()); 1319 1320 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1321 : VirtualBaseSpec; 1322 Diag(BaseSpec->getSourceRange().getBegin(), 1323 diag::note_base_class_specified_here) 1324 << BaseSpec->getType() 1325 << BaseSpec->getSourceRange(); 1326 1327 TyD = Type; 1328 } 1329 } 1330 } 1331 1332 if (!TyD && BaseType.isNull()) { 1333 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1334 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1335 return true; 1336 } 1337 } 1338 1339 if (BaseType.isNull()) { 1340 BaseType = Context.getTypeDeclType(TyD); 1341 if (SS.isSet()) { 1342 NestedNameSpecifier *Qualifier = 1343 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1344 1345 // FIXME: preserve source range information 1346 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1347 } 1348 } 1349 } 1350 1351 if (!TInfo) 1352 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1353 1354 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1355 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1356} 1357 1358/// Checks an initializer expression for use of uninitialized fields, such as 1359/// containing the field that is being initialized. Returns true if there is an 1360/// uninitialized field was used an updates the SourceLocation parameter; false 1361/// otherwise. 1362static bool InitExprContainsUninitializedFields(const Stmt *S, 1363 const ValueDecl *LhsField, 1364 SourceLocation *L) { 1365 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1366 1367 if (isa<CallExpr>(S)) { 1368 // Do not descend into function calls or constructors, as the use 1369 // of an uninitialized field may be valid. One would have to inspect 1370 // the contents of the function/ctor to determine if it is safe or not. 1371 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1372 // may be safe, depending on what the function/ctor does. 1373 return false; 1374 } 1375 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1376 const NamedDecl *RhsField = ME->getMemberDecl(); 1377 1378 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1379 // The member expression points to a static data member. 1380 assert(VD->isStaticDataMember() && 1381 "Member points to non-static data member!"); 1382 (void)VD; 1383 return false; 1384 } 1385 1386 if (isa<EnumConstantDecl>(RhsField)) { 1387 // The member expression points to an enum. 1388 return false; 1389 } 1390 1391 if (RhsField == LhsField) { 1392 // Initializing a field with itself. Throw a warning. 1393 // But wait; there are exceptions! 1394 // Exception #1: The field may not belong to this record. 1395 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1396 const Expr *base = ME->getBase(); 1397 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1398 // Even though the field matches, it does not belong to this record. 1399 return false; 1400 } 1401 // None of the exceptions triggered; return true to indicate an 1402 // uninitialized field was used. 1403 *L = ME->getMemberLoc(); 1404 return true; 1405 } 1406 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1407 // sizeof/alignof doesn't reference contents, do not warn. 1408 return false; 1409 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1410 // address-of doesn't reference contents (the pointer may be dereferenced 1411 // in the same expression but it would be rare; and weird). 1412 if (UOE->getOpcode() == UO_AddrOf) 1413 return false; 1414 } 1415 for (Stmt::const_child_range it = S->children(); it; ++it) { 1416 if (!*it) { 1417 // An expression such as 'member(arg ?: "")' may trigger this. 1418 continue; 1419 } 1420 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1421 return true; 1422 } 1423 return false; 1424} 1425 1426MemInitResult 1427Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1428 unsigned NumArgs, SourceLocation IdLoc, 1429 SourceLocation LParenLoc, 1430 SourceLocation RParenLoc) { 1431 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1432 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1433 assert((DirectMember || IndirectMember) && 1434 "Member must be a FieldDecl or IndirectFieldDecl"); 1435 1436 if (Member->isInvalidDecl()) 1437 return true; 1438 1439 // Diagnose value-uses of fields to initialize themselves, e.g. 1440 // foo(foo) 1441 // where foo is not also a parameter to the constructor. 1442 // TODO: implement -Wuninitialized and fold this into that framework. 1443 for (unsigned i = 0; i < NumArgs; ++i) { 1444 SourceLocation L; 1445 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1446 // FIXME: Return true in the case when other fields are used before being 1447 // uninitialized. For example, let this field be the i'th field. When 1448 // initializing the i'th field, throw a warning if any of the >= i'th 1449 // fields are used, as they are not yet initialized. 1450 // Right now we are only handling the case where the i'th field uses 1451 // itself in its initializer. 1452 Diag(L, diag::warn_field_is_uninit); 1453 } 1454 } 1455 1456 bool HasDependentArg = false; 1457 for (unsigned i = 0; i < NumArgs; i++) 1458 HasDependentArg |= Args[i]->isTypeDependent(); 1459 1460 Expr *Init; 1461 if (Member->getType()->isDependentType() || HasDependentArg) { 1462 // Can't check initialization for a member of dependent type or when 1463 // any of the arguments are type-dependent expressions. 1464 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1465 RParenLoc); 1466 1467 // Erase any temporaries within this evaluation context; we're not 1468 // going to track them in the AST, since we'll be rebuilding the 1469 // ASTs during template instantiation. 1470 ExprTemporaries.erase( 1471 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1472 ExprTemporaries.end()); 1473 } else { 1474 // Initialize the member. 1475 InitializedEntity MemberEntity = 1476 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1477 : InitializedEntity::InitializeMember(IndirectMember, 0); 1478 InitializationKind Kind = 1479 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1480 1481 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1482 1483 ExprResult MemberInit = 1484 InitSeq.Perform(*this, MemberEntity, Kind, 1485 MultiExprArg(*this, Args, NumArgs), 0); 1486 if (MemberInit.isInvalid()) 1487 return true; 1488 1489 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1490 1491 // C++0x [class.base.init]p7: 1492 // The initialization of each base and member constitutes a 1493 // full-expression. 1494 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1495 if (MemberInit.isInvalid()) 1496 return true; 1497 1498 // If we are in a dependent context, template instantiation will 1499 // perform this type-checking again. Just save the arguments that we 1500 // received in a ParenListExpr. 1501 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1502 // of the information that we have about the member 1503 // initializer. However, deconstructing the ASTs is a dicey process, 1504 // and this approach is far more likely to get the corner cases right. 1505 if (CurContext->isDependentContext()) 1506 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1507 RParenLoc); 1508 else 1509 Init = MemberInit.get(); 1510 } 1511 1512 if (DirectMember) { 1513 return new (Context) CXXCtorInitializer(Context, DirectMember, 1514 IdLoc, LParenLoc, Init, 1515 RParenLoc); 1516 } else { 1517 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1518 IdLoc, LParenLoc, Init, 1519 RParenLoc); 1520 } 1521} 1522 1523MemInitResult 1524Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1525 Expr **Args, unsigned NumArgs, 1526 SourceLocation NameLoc, 1527 SourceLocation LParenLoc, 1528 SourceLocation RParenLoc, 1529 CXXRecordDecl *ClassDecl) { 1530 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1531 if (!LangOpts.CPlusPlus0x) 1532 return Diag(Loc, diag::err_delegation_0x_only) 1533 << TInfo->getTypeLoc().getLocalSourceRange(); 1534 1535 // Initialize the object. 1536 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1537 QualType(ClassDecl->getTypeForDecl(), 0)); 1538 InitializationKind Kind = 1539 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1540 1541 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1542 1543 ExprResult DelegationInit = 1544 InitSeq.Perform(*this, DelegationEntity, Kind, 1545 MultiExprArg(*this, Args, NumArgs), 0); 1546 if (DelegationInit.isInvalid()) 1547 return true; 1548 1549 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1550 CXXConstructorDecl *Constructor 1551 = ConExpr->getConstructor(); 1552 assert(Constructor && "Delegating constructor with no target?"); 1553 1554 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1555 1556 // C++0x [class.base.init]p7: 1557 // The initialization of each base and member constitutes a 1558 // full-expression. 1559 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1560 if (DelegationInit.isInvalid()) 1561 return true; 1562 1563 // If we are in a dependent context, template instantiation will 1564 // perform this type-checking again. Just save the arguments that we 1565 // received in a ParenListExpr. 1566 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1567 // of the information that we have about the base 1568 // initializer. However, deconstructing the ASTs is a dicey process, 1569 // and this approach is far more likely to get the corner cases right. 1570 if (CurContext->isDependentContext()) { 1571 ExprResult Init 1572 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1573 NumArgs, RParenLoc)); 1574 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1575 Constructor, Init.takeAs<Expr>(), 1576 RParenLoc); 1577 } 1578 1579 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1580 DelegationInit.takeAs<Expr>(), 1581 RParenLoc); 1582} 1583 1584MemInitResult 1585Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1586 Expr **Args, unsigned NumArgs, 1587 SourceLocation LParenLoc, SourceLocation RParenLoc, 1588 CXXRecordDecl *ClassDecl, 1589 SourceLocation EllipsisLoc) { 1590 bool HasDependentArg = false; 1591 for (unsigned i = 0; i < NumArgs; i++) 1592 HasDependentArg |= Args[i]->isTypeDependent(); 1593 1594 SourceLocation BaseLoc 1595 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1596 1597 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1598 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1599 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1600 1601 // C++ [class.base.init]p2: 1602 // [...] Unless the mem-initializer-id names a nonstatic data 1603 // member of the constructor's class or a direct or virtual base 1604 // of that class, the mem-initializer is ill-formed. A 1605 // mem-initializer-list can initialize a base class using any 1606 // name that denotes that base class type. 1607 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1608 1609 if (EllipsisLoc.isValid()) { 1610 // This is a pack expansion. 1611 if (!BaseType->containsUnexpandedParameterPack()) { 1612 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1613 << SourceRange(BaseLoc, RParenLoc); 1614 1615 EllipsisLoc = SourceLocation(); 1616 } 1617 } else { 1618 // Check for any unexpanded parameter packs. 1619 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1620 return true; 1621 1622 for (unsigned I = 0; I != NumArgs; ++I) 1623 if (DiagnoseUnexpandedParameterPack(Args[I])) 1624 return true; 1625 } 1626 1627 // Check for direct and virtual base classes. 1628 const CXXBaseSpecifier *DirectBaseSpec = 0; 1629 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1630 if (!Dependent) { 1631 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1632 BaseType)) 1633 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1634 LParenLoc, RParenLoc, ClassDecl); 1635 1636 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1637 VirtualBaseSpec); 1638 1639 // C++ [base.class.init]p2: 1640 // Unless the mem-initializer-id names a nonstatic data member of the 1641 // constructor's class or a direct or virtual base of that class, the 1642 // mem-initializer is ill-formed. 1643 if (!DirectBaseSpec && !VirtualBaseSpec) { 1644 // If the class has any dependent bases, then it's possible that 1645 // one of those types will resolve to the same type as 1646 // BaseType. Therefore, just treat this as a dependent base 1647 // class initialization. FIXME: Should we try to check the 1648 // initialization anyway? It seems odd. 1649 if (ClassDecl->hasAnyDependentBases()) 1650 Dependent = true; 1651 else 1652 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1653 << BaseType << Context.getTypeDeclType(ClassDecl) 1654 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1655 } 1656 } 1657 1658 if (Dependent) { 1659 // Can't check initialization for a base of dependent type or when 1660 // any of the arguments are type-dependent expressions. 1661 ExprResult BaseInit 1662 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1663 RParenLoc)); 1664 1665 // Erase any temporaries within this evaluation context; we're not 1666 // going to track them in the AST, since we'll be rebuilding the 1667 // ASTs during template instantiation. 1668 ExprTemporaries.erase( 1669 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1670 ExprTemporaries.end()); 1671 1672 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1673 /*IsVirtual=*/false, 1674 LParenLoc, 1675 BaseInit.takeAs<Expr>(), 1676 RParenLoc, 1677 EllipsisLoc); 1678 } 1679 1680 // C++ [base.class.init]p2: 1681 // If a mem-initializer-id is ambiguous because it designates both 1682 // a direct non-virtual base class and an inherited virtual base 1683 // class, the mem-initializer is ill-formed. 1684 if (DirectBaseSpec && VirtualBaseSpec) 1685 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1686 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1687 1688 CXXBaseSpecifier *BaseSpec 1689 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1690 if (!BaseSpec) 1691 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1692 1693 // Initialize the base. 1694 InitializedEntity BaseEntity = 1695 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1696 InitializationKind Kind = 1697 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1698 1699 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1700 1701 ExprResult BaseInit = 1702 InitSeq.Perform(*this, BaseEntity, Kind, 1703 MultiExprArg(*this, Args, NumArgs), 0); 1704 if (BaseInit.isInvalid()) 1705 return true; 1706 1707 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1708 1709 // C++0x [class.base.init]p7: 1710 // The initialization of each base and member constitutes a 1711 // full-expression. 1712 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1713 if (BaseInit.isInvalid()) 1714 return true; 1715 1716 // If we are in a dependent context, template instantiation will 1717 // perform this type-checking again. Just save the arguments that we 1718 // received in a ParenListExpr. 1719 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1720 // of the information that we have about the base 1721 // initializer. However, deconstructing the ASTs is a dicey process, 1722 // and this approach is far more likely to get the corner cases right. 1723 if (CurContext->isDependentContext()) { 1724 ExprResult Init 1725 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1726 RParenLoc)); 1727 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1728 BaseSpec->isVirtual(), 1729 LParenLoc, 1730 Init.takeAs<Expr>(), 1731 RParenLoc, 1732 EllipsisLoc); 1733 } 1734 1735 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1736 BaseSpec->isVirtual(), 1737 LParenLoc, 1738 BaseInit.takeAs<Expr>(), 1739 RParenLoc, 1740 EllipsisLoc); 1741} 1742 1743/// ImplicitInitializerKind - How an implicit base or member initializer should 1744/// initialize its base or member. 1745enum ImplicitInitializerKind { 1746 IIK_Default, 1747 IIK_Copy, 1748 IIK_Move 1749}; 1750 1751static bool 1752BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1753 ImplicitInitializerKind ImplicitInitKind, 1754 CXXBaseSpecifier *BaseSpec, 1755 bool IsInheritedVirtualBase, 1756 CXXCtorInitializer *&CXXBaseInit) { 1757 InitializedEntity InitEntity 1758 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1759 IsInheritedVirtualBase); 1760 1761 ExprResult BaseInit; 1762 1763 switch (ImplicitInitKind) { 1764 case IIK_Default: { 1765 InitializationKind InitKind 1766 = InitializationKind::CreateDefault(Constructor->getLocation()); 1767 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1768 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1769 MultiExprArg(SemaRef, 0, 0)); 1770 break; 1771 } 1772 1773 case IIK_Copy: { 1774 ParmVarDecl *Param = Constructor->getParamDecl(0); 1775 QualType ParamType = Param->getType().getNonReferenceType(); 1776 1777 Expr *CopyCtorArg = 1778 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1779 Constructor->getLocation(), ParamType, 1780 VK_LValue, 0); 1781 1782 // Cast to the base class to avoid ambiguities. 1783 QualType ArgTy = 1784 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1785 ParamType.getQualifiers()); 1786 1787 CXXCastPath BasePath; 1788 BasePath.push_back(BaseSpec); 1789 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1790 CK_UncheckedDerivedToBase, 1791 VK_LValue, &BasePath).take(); 1792 1793 InitializationKind InitKind 1794 = InitializationKind::CreateDirect(Constructor->getLocation(), 1795 SourceLocation(), SourceLocation()); 1796 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1797 &CopyCtorArg, 1); 1798 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1799 MultiExprArg(&CopyCtorArg, 1)); 1800 break; 1801 } 1802 1803 case IIK_Move: 1804 assert(false && "Unhandled initializer kind!"); 1805 } 1806 1807 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1808 if (BaseInit.isInvalid()) 1809 return true; 1810 1811 CXXBaseInit = 1812 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1813 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1814 SourceLocation()), 1815 BaseSpec->isVirtual(), 1816 SourceLocation(), 1817 BaseInit.takeAs<Expr>(), 1818 SourceLocation(), 1819 SourceLocation()); 1820 1821 return false; 1822} 1823 1824static bool 1825BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1826 ImplicitInitializerKind ImplicitInitKind, 1827 FieldDecl *Field, 1828 CXXCtorInitializer *&CXXMemberInit) { 1829 if (Field->isInvalidDecl()) 1830 return true; 1831 1832 SourceLocation Loc = Constructor->getLocation(); 1833 1834 if (ImplicitInitKind == IIK_Copy) { 1835 ParmVarDecl *Param = Constructor->getParamDecl(0); 1836 QualType ParamType = Param->getType().getNonReferenceType(); 1837 1838 Expr *MemberExprBase = 1839 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1840 Loc, ParamType, VK_LValue, 0); 1841 1842 // Build a reference to this field within the parameter. 1843 CXXScopeSpec SS; 1844 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1845 Sema::LookupMemberName); 1846 MemberLookup.addDecl(Field, AS_public); 1847 MemberLookup.resolveKind(); 1848 ExprResult CopyCtorArg 1849 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1850 ParamType, Loc, 1851 /*IsArrow=*/false, 1852 SS, 1853 /*FirstQualifierInScope=*/0, 1854 MemberLookup, 1855 /*TemplateArgs=*/0); 1856 if (CopyCtorArg.isInvalid()) 1857 return true; 1858 1859 // When the field we are copying is an array, create index variables for 1860 // each dimension of the array. We use these index variables to subscript 1861 // the source array, and other clients (e.g., CodeGen) will perform the 1862 // necessary iteration with these index variables. 1863 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1864 QualType BaseType = Field->getType(); 1865 QualType SizeType = SemaRef.Context.getSizeType(); 1866 while (const ConstantArrayType *Array 1867 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1868 // Create the iteration variable for this array index. 1869 IdentifierInfo *IterationVarName = 0; 1870 { 1871 llvm::SmallString<8> Str; 1872 llvm::raw_svector_ostream OS(Str); 1873 OS << "__i" << IndexVariables.size(); 1874 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1875 } 1876 VarDecl *IterationVar 1877 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1878 IterationVarName, SizeType, 1879 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1880 SC_None, SC_None); 1881 IndexVariables.push_back(IterationVar); 1882 1883 // Create a reference to the iteration variable. 1884 ExprResult IterationVarRef 1885 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1886 assert(!IterationVarRef.isInvalid() && 1887 "Reference to invented variable cannot fail!"); 1888 1889 // Subscript the array with this iteration variable. 1890 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1891 Loc, 1892 IterationVarRef.take(), 1893 Loc); 1894 if (CopyCtorArg.isInvalid()) 1895 return true; 1896 1897 BaseType = Array->getElementType(); 1898 } 1899 1900 // Construct the entity that we will be initializing. For an array, this 1901 // will be first element in the array, which may require several levels 1902 // of array-subscript entities. 1903 llvm::SmallVector<InitializedEntity, 4> Entities; 1904 Entities.reserve(1 + IndexVariables.size()); 1905 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1906 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1907 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1908 0, 1909 Entities.back())); 1910 1911 // Direct-initialize to use the copy constructor. 1912 InitializationKind InitKind = 1913 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1914 1915 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1916 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1917 &CopyCtorArgE, 1); 1918 1919 ExprResult MemberInit 1920 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1921 MultiExprArg(&CopyCtorArgE, 1)); 1922 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1923 if (MemberInit.isInvalid()) 1924 return true; 1925 1926 CXXMemberInit 1927 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1928 MemberInit.takeAs<Expr>(), Loc, 1929 IndexVariables.data(), 1930 IndexVariables.size()); 1931 return false; 1932 } 1933 1934 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1935 1936 QualType FieldBaseElementType = 1937 SemaRef.Context.getBaseElementType(Field->getType()); 1938 1939 if (FieldBaseElementType->isRecordType()) { 1940 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1941 InitializationKind InitKind = 1942 InitializationKind::CreateDefault(Loc); 1943 1944 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1945 ExprResult MemberInit = 1946 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1947 1948 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1949 if (MemberInit.isInvalid()) 1950 return true; 1951 1952 CXXMemberInit = 1953 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1954 Field, Loc, Loc, 1955 MemberInit.get(), 1956 Loc); 1957 return false; 1958 } 1959 1960 if (FieldBaseElementType->isReferenceType()) { 1961 SemaRef.Diag(Constructor->getLocation(), 1962 diag::err_uninitialized_member_in_ctor) 1963 << (int)Constructor->isImplicit() 1964 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1965 << 0 << Field->getDeclName(); 1966 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1967 return true; 1968 } 1969 1970 if (FieldBaseElementType.isConstQualified()) { 1971 SemaRef.Diag(Constructor->getLocation(), 1972 diag::err_uninitialized_member_in_ctor) 1973 << (int)Constructor->isImplicit() 1974 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1975 << 1 << Field->getDeclName(); 1976 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1977 return true; 1978 } 1979 1980 // Nothing to initialize. 1981 CXXMemberInit = 0; 1982 return false; 1983} 1984 1985namespace { 1986struct BaseAndFieldInfo { 1987 Sema &S; 1988 CXXConstructorDecl *Ctor; 1989 bool AnyErrorsInInits; 1990 ImplicitInitializerKind IIK; 1991 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1992 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1993 1994 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1995 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1996 // FIXME: Handle implicit move constructors. 1997 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1998 IIK = IIK_Copy; 1999 else 2000 IIK = IIK_Default; 2001 } 2002}; 2003} 2004 2005static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2006 FieldDecl *Top, FieldDecl *Field) { 2007 2008 // Overwhelmingly common case: we have a direct initializer for this field. 2009 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2010 Info.AllToInit.push_back(Init); 2011 return false; 2012 } 2013 2014 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2015 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2016 assert(FieldClassType && "anonymous struct/union without record type"); 2017 CXXRecordDecl *FieldClassDecl 2018 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2019 2020 // Even though union members never have non-trivial default 2021 // constructions in C++03, we still build member initializers for aggregate 2022 // record types which can be union members, and C++0x allows non-trivial 2023 // default constructors for union members, so we ensure that only one 2024 // member is initialized for these. 2025 if (FieldClassDecl->isUnion()) { 2026 // First check for an explicit initializer for one field. 2027 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2028 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2029 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2030 Info.AllToInit.push_back(Init); 2031 2032 // Once we've initialized a field of an anonymous union, the union 2033 // field in the class is also initialized, so exit immediately. 2034 return false; 2035 } else if ((*FA)->isAnonymousStructOrUnion()) { 2036 if (CollectFieldInitializer(Info, Top, *FA)) 2037 return true; 2038 } 2039 } 2040 2041 // Fallthrough and construct a default initializer for the union as 2042 // a whole, which can call its default constructor if such a thing exists 2043 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2044 // behavior going forward with C++0x, when anonymous unions there are 2045 // finalized, we should revisit this. 2046 } else { 2047 // For structs, we simply descend through to initialize all members where 2048 // necessary. 2049 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2050 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2051 if (CollectFieldInitializer(Info, Top, *FA)) 2052 return true; 2053 } 2054 } 2055 } 2056 2057 // Don't try to build an implicit initializer if there were semantic 2058 // errors in any of the initializers (and therefore we might be 2059 // missing some that the user actually wrote). 2060 if (Info.AnyErrorsInInits) 2061 return false; 2062 2063 CXXCtorInitializer *Init = 0; 2064 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2065 return true; 2066 2067 if (Init) 2068 Info.AllToInit.push_back(Init); 2069 2070 return false; 2071} 2072 2073bool 2074Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2075 CXXCtorInitializer *Initializer) { 2076 assert(Initializer->isDelegatingInitializer()); 2077 Constructor->setNumCtorInitializers(1); 2078 CXXCtorInitializer **initializer = 2079 new (Context) CXXCtorInitializer*[1]; 2080 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2081 Constructor->setCtorInitializers(initializer); 2082 2083 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2084 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2085 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2086 } 2087 2088 if (LangOpts.CheckDelegatingCtorCycles) 2089 DelegatingCtorDecls.push_back(Constructor); 2090 2091 return false; 2092} 2093 2094bool 2095Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2096 CXXCtorInitializer **Initializers, 2097 unsigned NumInitializers, 2098 bool AnyErrors) { 2099 if (Constructor->getDeclContext()->isDependentContext()) { 2100 // Just store the initializers as written, they will be checked during 2101 // instantiation. 2102 if (NumInitializers > 0) { 2103 Constructor->setNumCtorInitializers(NumInitializers); 2104 CXXCtorInitializer **baseOrMemberInitializers = 2105 new (Context) CXXCtorInitializer*[NumInitializers]; 2106 memcpy(baseOrMemberInitializers, Initializers, 2107 NumInitializers * sizeof(CXXCtorInitializer*)); 2108 Constructor->setCtorInitializers(baseOrMemberInitializers); 2109 } 2110 2111 return false; 2112 } 2113 2114 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2115 2116 // We need to build the initializer AST according to order of construction 2117 // and not what user specified in the Initializers list. 2118 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2119 if (!ClassDecl) 2120 return true; 2121 2122 bool HadError = false; 2123 2124 for (unsigned i = 0; i < NumInitializers; i++) { 2125 CXXCtorInitializer *Member = Initializers[i]; 2126 2127 if (Member->isBaseInitializer()) 2128 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2129 else 2130 Info.AllBaseFields[Member->getAnyMember()] = Member; 2131 } 2132 2133 // Keep track of the direct virtual bases. 2134 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2135 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2136 E = ClassDecl->bases_end(); I != E; ++I) { 2137 if (I->isVirtual()) 2138 DirectVBases.insert(I); 2139 } 2140 2141 // Push virtual bases before others. 2142 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2143 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2144 2145 if (CXXCtorInitializer *Value 2146 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2147 Info.AllToInit.push_back(Value); 2148 } else if (!AnyErrors) { 2149 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2150 CXXCtorInitializer *CXXBaseInit; 2151 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2152 VBase, IsInheritedVirtualBase, 2153 CXXBaseInit)) { 2154 HadError = true; 2155 continue; 2156 } 2157 2158 Info.AllToInit.push_back(CXXBaseInit); 2159 } 2160 } 2161 2162 // Non-virtual bases. 2163 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2164 E = ClassDecl->bases_end(); Base != E; ++Base) { 2165 // Virtuals are in the virtual base list and already constructed. 2166 if (Base->isVirtual()) 2167 continue; 2168 2169 if (CXXCtorInitializer *Value 2170 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2171 Info.AllToInit.push_back(Value); 2172 } else if (!AnyErrors) { 2173 CXXCtorInitializer *CXXBaseInit; 2174 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2175 Base, /*IsInheritedVirtualBase=*/false, 2176 CXXBaseInit)) { 2177 HadError = true; 2178 continue; 2179 } 2180 2181 Info.AllToInit.push_back(CXXBaseInit); 2182 } 2183 } 2184 2185 // Fields. 2186 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2187 E = ClassDecl->field_end(); Field != E; ++Field) { 2188 if ((*Field)->getType()->isIncompleteArrayType()) { 2189 assert(ClassDecl->hasFlexibleArrayMember() && 2190 "Incomplete array type is not valid"); 2191 continue; 2192 } 2193 if (CollectFieldInitializer(Info, *Field, *Field)) 2194 HadError = true; 2195 } 2196 2197 NumInitializers = Info.AllToInit.size(); 2198 if (NumInitializers > 0) { 2199 Constructor->setNumCtorInitializers(NumInitializers); 2200 CXXCtorInitializer **baseOrMemberInitializers = 2201 new (Context) CXXCtorInitializer*[NumInitializers]; 2202 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2203 NumInitializers * sizeof(CXXCtorInitializer*)); 2204 Constructor->setCtorInitializers(baseOrMemberInitializers); 2205 2206 // Constructors implicitly reference the base and member 2207 // destructors. 2208 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2209 Constructor->getParent()); 2210 } 2211 2212 return HadError; 2213} 2214 2215static void *GetKeyForTopLevelField(FieldDecl *Field) { 2216 // For anonymous unions, use the class declaration as the key. 2217 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2218 if (RT->getDecl()->isAnonymousStructOrUnion()) 2219 return static_cast<void *>(RT->getDecl()); 2220 } 2221 return static_cast<void *>(Field); 2222} 2223 2224static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2225 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2226} 2227 2228static void *GetKeyForMember(ASTContext &Context, 2229 CXXCtorInitializer *Member) { 2230 if (!Member->isAnyMemberInitializer()) 2231 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2232 2233 // For fields injected into the class via declaration of an anonymous union, 2234 // use its anonymous union class declaration as the unique key. 2235 FieldDecl *Field = Member->getAnyMember(); 2236 2237 // If the field is a member of an anonymous struct or union, our key 2238 // is the anonymous record decl that's a direct child of the class. 2239 RecordDecl *RD = Field->getParent(); 2240 if (RD->isAnonymousStructOrUnion()) { 2241 while (true) { 2242 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2243 if (Parent->isAnonymousStructOrUnion()) 2244 RD = Parent; 2245 else 2246 break; 2247 } 2248 2249 return static_cast<void *>(RD); 2250 } 2251 2252 return static_cast<void *>(Field); 2253} 2254 2255static void 2256DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2257 const CXXConstructorDecl *Constructor, 2258 CXXCtorInitializer **Inits, 2259 unsigned NumInits) { 2260 if (Constructor->getDeclContext()->isDependentContext()) 2261 return; 2262 2263 // Don't check initializers order unless the warning is enabled at the 2264 // location of at least one initializer. 2265 bool ShouldCheckOrder = false; 2266 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2267 CXXCtorInitializer *Init = Inits[InitIndex]; 2268 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2269 Init->getSourceLocation()) 2270 != Diagnostic::Ignored) { 2271 ShouldCheckOrder = true; 2272 break; 2273 } 2274 } 2275 if (!ShouldCheckOrder) 2276 return; 2277 2278 // Build the list of bases and members in the order that they'll 2279 // actually be initialized. The explicit initializers should be in 2280 // this same order but may be missing things. 2281 llvm::SmallVector<const void*, 32> IdealInitKeys; 2282 2283 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2284 2285 // 1. Virtual bases. 2286 for (CXXRecordDecl::base_class_const_iterator VBase = 2287 ClassDecl->vbases_begin(), 2288 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2289 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2290 2291 // 2. Non-virtual bases. 2292 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2293 E = ClassDecl->bases_end(); Base != E; ++Base) { 2294 if (Base->isVirtual()) 2295 continue; 2296 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2297 } 2298 2299 // 3. Direct fields. 2300 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2301 E = ClassDecl->field_end(); Field != E; ++Field) 2302 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2303 2304 unsigned NumIdealInits = IdealInitKeys.size(); 2305 unsigned IdealIndex = 0; 2306 2307 CXXCtorInitializer *PrevInit = 0; 2308 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2309 CXXCtorInitializer *Init = Inits[InitIndex]; 2310 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2311 2312 // Scan forward to try to find this initializer in the idealized 2313 // initializers list. 2314 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2315 if (InitKey == IdealInitKeys[IdealIndex]) 2316 break; 2317 2318 // If we didn't find this initializer, it must be because we 2319 // scanned past it on a previous iteration. That can only 2320 // happen if we're out of order; emit a warning. 2321 if (IdealIndex == NumIdealInits && PrevInit) { 2322 Sema::SemaDiagnosticBuilder D = 2323 SemaRef.Diag(PrevInit->getSourceLocation(), 2324 diag::warn_initializer_out_of_order); 2325 2326 if (PrevInit->isAnyMemberInitializer()) 2327 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2328 else 2329 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2330 2331 if (Init->isAnyMemberInitializer()) 2332 D << 0 << Init->getAnyMember()->getDeclName(); 2333 else 2334 D << 1 << Init->getBaseClassInfo()->getType(); 2335 2336 // Move back to the initializer's location in the ideal list. 2337 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2338 if (InitKey == IdealInitKeys[IdealIndex]) 2339 break; 2340 2341 assert(IdealIndex != NumIdealInits && 2342 "initializer not found in initializer list"); 2343 } 2344 2345 PrevInit = Init; 2346 } 2347} 2348 2349namespace { 2350bool CheckRedundantInit(Sema &S, 2351 CXXCtorInitializer *Init, 2352 CXXCtorInitializer *&PrevInit) { 2353 if (!PrevInit) { 2354 PrevInit = Init; 2355 return false; 2356 } 2357 2358 if (FieldDecl *Field = Init->getMember()) 2359 S.Diag(Init->getSourceLocation(), 2360 diag::err_multiple_mem_initialization) 2361 << Field->getDeclName() 2362 << Init->getSourceRange(); 2363 else { 2364 const Type *BaseClass = Init->getBaseClass(); 2365 assert(BaseClass && "neither field nor base"); 2366 S.Diag(Init->getSourceLocation(), 2367 diag::err_multiple_base_initialization) 2368 << QualType(BaseClass, 0) 2369 << Init->getSourceRange(); 2370 } 2371 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2372 << 0 << PrevInit->getSourceRange(); 2373 2374 return true; 2375} 2376 2377typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2378typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2379 2380bool CheckRedundantUnionInit(Sema &S, 2381 CXXCtorInitializer *Init, 2382 RedundantUnionMap &Unions) { 2383 FieldDecl *Field = Init->getAnyMember(); 2384 RecordDecl *Parent = Field->getParent(); 2385 if (!Parent->isAnonymousStructOrUnion()) 2386 return false; 2387 2388 NamedDecl *Child = Field; 2389 do { 2390 if (Parent->isUnion()) { 2391 UnionEntry &En = Unions[Parent]; 2392 if (En.first && En.first != Child) { 2393 S.Diag(Init->getSourceLocation(), 2394 diag::err_multiple_mem_union_initialization) 2395 << Field->getDeclName() 2396 << Init->getSourceRange(); 2397 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2398 << 0 << En.second->getSourceRange(); 2399 return true; 2400 } else if (!En.first) { 2401 En.first = Child; 2402 En.second = Init; 2403 } 2404 } 2405 2406 Child = Parent; 2407 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2408 } while (Parent->isAnonymousStructOrUnion()); 2409 2410 return false; 2411} 2412} 2413 2414/// ActOnMemInitializers - Handle the member initializers for a constructor. 2415void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2416 SourceLocation ColonLoc, 2417 MemInitTy **meminits, unsigned NumMemInits, 2418 bool AnyErrors) { 2419 if (!ConstructorDecl) 2420 return; 2421 2422 AdjustDeclIfTemplate(ConstructorDecl); 2423 2424 CXXConstructorDecl *Constructor 2425 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2426 2427 if (!Constructor) { 2428 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2429 return; 2430 } 2431 2432 CXXCtorInitializer **MemInits = 2433 reinterpret_cast<CXXCtorInitializer **>(meminits); 2434 2435 // Mapping for the duplicate initializers check. 2436 // For member initializers, this is keyed with a FieldDecl*. 2437 // For base initializers, this is keyed with a Type*. 2438 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2439 2440 // Mapping for the inconsistent anonymous-union initializers check. 2441 RedundantUnionMap MemberUnions; 2442 2443 bool HadError = false; 2444 for (unsigned i = 0; i < NumMemInits; i++) { 2445 CXXCtorInitializer *Init = MemInits[i]; 2446 2447 // Set the source order index. 2448 Init->setSourceOrder(i); 2449 2450 if (Init->isAnyMemberInitializer()) { 2451 FieldDecl *Field = Init->getAnyMember(); 2452 if (CheckRedundantInit(*this, Init, Members[Field]) || 2453 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2454 HadError = true; 2455 } else if (Init->isBaseInitializer()) { 2456 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2457 if (CheckRedundantInit(*this, Init, Members[Key])) 2458 HadError = true; 2459 } else { 2460 assert(Init->isDelegatingInitializer()); 2461 // This must be the only initializer 2462 if (i != 0 || NumMemInits > 1) { 2463 Diag(MemInits[0]->getSourceLocation(), 2464 diag::err_delegating_initializer_alone) 2465 << MemInits[0]->getSourceRange(); 2466 HadError = true; 2467 // We will treat this as being the only initializer. 2468 } 2469 SetDelegatingInitializer(Constructor, MemInits[i]); 2470 // Return immediately as the initializer is set. 2471 return; 2472 } 2473 } 2474 2475 if (HadError) 2476 return; 2477 2478 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2479 2480 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2481} 2482 2483void 2484Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2485 CXXRecordDecl *ClassDecl) { 2486 // Ignore dependent contexts. 2487 if (ClassDecl->isDependentContext()) 2488 return; 2489 2490 // FIXME: all the access-control diagnostics are positioned on the 2491 // field/base declaration. That's probably good; that said, the 2492 // user might reasonably want to know why the destructor is being 2493 // emitted, and we currently don't say. 2494 2495 // Non-static data members. 2496 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2497 E = ClassDecl->field_end(); I != E; ++I) { 2498 FieldDecl *Field = *I; 2499 if (Field->isInvalidDecl()) 2500 continue; 2501 QualType FieldType = Context.getBaseElementType(Field->getType()); 2502 2503 const RecordType* RT = FieldType->getAs<RecordType>(); 2504 if (!RT) 2505 continue; 2506 2507 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2508 if (FieldClassDecl->isInvalidDecl()) 2509 continue; 2510 if (FieldClassDecl->hasTrivialDestructor()) 2511 continue; 2512 2513 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2514 assert(Dtor && "No dtor found for FieldClassDecl!"); 2515 CheckDestructorAccess(Field->getLocation(), Dtor, 2516 PDiag(diag::err_access_dtor_field) 2517 << Field->getDeclName() 2518 << FieldType); 2519 2520 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2521 } 2522 2523 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2524 2525 // Bases. 2526 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2527 E = ClassDecl->bases_end(); Base != E; ++Base) { 2528 // Bases are always records in a well-formed non-dependent class. 2529 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2530 2531 // Remember direct virtual bases. 2532 if (Base->isVirtual()) 2533 DirectVirtualBases.insert(RT); 2534 2535 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2536 // If our base class is invalid, we probably can't get its dtor anyway. 2537 if (BaseClassDecl->isInvalidDecl()) 2538 continue; 2539 // Ignore trivial destructors. 2540 if (BaseClassDecl->hasTrivialDestructor()) 2541 continue; 2542 2543 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2544 assert(Dtor && "No dtor found for BaseClassDecl!"); 2545 2546 // FIXME: caret should be on the start of the class name 2547 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2548 PDiag(diag::err_access_dtor_base) 2549 << Base->getType() 2550 << Base->getSourceRange()); 2551 2552 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2553 } 2554 2555 // Virtual bases. 2556 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2557 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2558 2559 // Bases are always records in a well-formed non-dependent class. 2560 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2561 2562 // Ignore direct virtual bases. 2563 if (DirectVirtualBases.count(RT)) 2564 continue; 2565 2566 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2567 // If our base class is invalid, we probably can't get its dtor anyway. 2568 if (BaseClassDecl->isInvalidDecl()) 2569 continue; 2570 // Ignore trivial destructors. 2571 if (BaseClassDecl->hasTrivialDestructor()) 2572 continue; 2573 2574 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2575 assert(Dtor && "No dtor found for BaseClassDecl!"); 2576 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2577 PDiag(diag::err_access_dtor_vbase) 2578 << VBase->getType()); 2579 2580 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2581 } 2582} 2583 2584void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2585 if (!CDtorDecl) 2586 return; 2587 2588 if (CXXConstructorDecl *Constructor 2589 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2590 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2591} 2592 2593bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2594 unsigned DiagID, AbstractDiagSelID SelID) { 2595 if (SelID == -1) 2596 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2597 else 2598 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2599} 2600 2601bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2602 const PartialDiagnostic &PD) { 2603 if (!getLangOptions().CPlusPlus) 2604 return false; 2605 2606 if (const ArrayType *AT = Context.getAsArrayType(T)) 2607 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2608 2609 if (const PointerType *PT = T->getAs<PointerType>()) { 2610 // Find the innermost pointer type. 2611 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2612 PT = T; 2613 2614 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2615 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2616 } 2617 2618 const RecordType *RT = T->getAs<RecordType>(); 2619 if (!RT) 2620 return false; 2621 2622 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2623 2624 // We can't answer whether something is abstract until it has a 2625 // definition. If it's currently being defined, we'll walk back 2626 // over all the declarations when we have a full definition. 2627 const CXXRecordDecl *Def = RD->getDefinition(); 2628 if (!Def || Def->isBeingDefined()) 2629 return false; 2630 2631 if (!RD->isAbstract()) 2632 return false; 2633 2634 Diag(Loc, PD) << RD->getDeclName(); 2635 DiagnoseAbstractType(RD); 2636 2637 return true; 2638} 2639 2640void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2641 // Check if we've already emitted the list of pure virtual functions 2642 // for this class. 2643 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2644 return; 2645 2646 CXXFinalOverriderMap FinalOverriders; 2647 RD->getFinalOverriders(FinalOverriders); 2648 2649 // Keep a set of seen pure methods so we won't diagnose the same method 2650 // more than once. 2651 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2652 2653 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2654 MEnd = FinalOverriders.end(); 2655 M != MEnd; 2656 ++M) { 2657 for (OverridingMethods::iterator SO = M->second.begin(), 2658 SOEnd = M->second.end(); 2659 SO != SOEnd; ++SO) { 2660 // C++ [class.abstract]p4: 2661 // A class is abstract if it contains or inherits at least one 2662 // pure virtual function for which the final overrider is pure 2663 // virtual. 2664 2665 // 2666 if (SO->second.size() != 1) 2667 continue; 2668 2669 if (!SO->second.front().Method->isPure()) 2670 continue; 2671 2672 if (!SeenPureMethods.insert(SO->second.front().Method)) 2673 continue; 2674 2675 Diag(SO->second.front().Method->getLocation(), 2676 diag::note_pure_virtual_function) 2677 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2678 } 2679 } 2680 2681 if (!PureVirtualClassDiagSet) 2682 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2683 PureVirtualClassDiagSet->insert(RD); 2684} 2685 2686namespace { 2687struct AbstractUsageInfo { 2688 Sema &S; 2689 CXXRecordDecl *Record; 2690 CanQualType AbstractType; 2691 bool Invalid; 2692 2693 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2694 : S(S), Record(Record), 2695 AbstractType(S.Context.getCanonicalType( 2696 S.Context.getTypeDeclType(Record))), 2697 Invalid(false) {} 2698 2699 void DiagnoseAbstractType() { 2700 if (Invalid) return; 2701 S.DiagnoseAbstractType(Record); 2702 Invalid = true; 2703 } 2704 2705 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2706}; 2707 2708struct CheckAbstractUsage { 2709 AbstractUsageInfo &Info; 2710 const NamedDecl *Ctx; 2711 2712 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2713 : Info(Info), Ctx(Ctx) {} 2714 2715 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2716 switch (TL.getTypeLocClass()) { 2717#define ABSTRACT_TYPELOC(CLASS, PARENT) 2718#define TYPELOC(CLASS, PARENT) \ 2719 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2720#include "clang/AST/TypeLocNodes.def" 2721 } 2722 } 2723 2724 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2725 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2726 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2727 if (!TL.getArg(I)) 2728 continue; 2729 2730 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2731 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2732 } 2733 } 2734 2735 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2736 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2737 } 2738 2739 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2740 // Visit the type parameters from a permissive context. 2741 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2742 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2743 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2744 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2745 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2746 // TODO: other template argument types? 2747 } 2748 } 2749 2750 // Visit pointee types from a permissive context. 2751#define CheckPolymorphic(Type) \ 2752 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2753 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2754 } 2755 CheckPolymorphic(PointerTypeLoc) 2756 CheckPolymorphic(ReferenceTypeLoc) 2757 CheckPolymorphic(MemberPointerTypeLoc) 2758 CheckPolymorphic(BlockPointerTypeLoc) 2759 2760 /// Handle all the types we haven't given a more specific 2761 /// implementation for above. 2762 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2763 // Every other kind of type that we haven't called out already 2764 // that has an inner type is either (1) sugar or (2) contains that 2765 // inner type in some way as a subobject. 2766 if (TypeLoc Next = TL.getNextTypeLoc()) 2767 return Visit(Next, Sel); 2768 2769 // If there's no inner type and we're in a permissive context, 2770 // don't diagnose. 2771 if (Sel == Sema::AbstractNone) return; 2772 2773 // Check whether the type matches the abstract type. 2774 QualType T = TL.getType(); 2775 if (T->isArrayType()) { 2776 Sel = Sema::AbstractArrayType; 2777 T = Info.S.Context.getBaseElementType(T); 2778 } 2779 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2780 if (CT != Info.AbstractType) return; 2781 2782 // It matched; do some magic. 2783 if (Sel == Sema::AbstractArrayType) { 2784 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2785 << T << TL.getSourceRange(); 2786 } else { 2787 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2788 << Sel << T << TL.getSourceRange(); 2789 } 2790 Info.DiagnoseAbstractType(); 2791 } 2792}; 2793 2794void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2795 Sema::AbstractDiagSelID Sel) { 2796 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2797} 2798 2799} 2800 2801/// Check for invalid uses of an abstract type in a method declaration. 2802static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2803 CXXMethodDecl *MD) { 2804 // No need to do the check on definitions, which require that 2805 // the return/param types be complete. 2806 if (MD->isThisDeclarationADefinition()) 2807 return; 2808 2809 // For safety's sake, just ignore it if we don't have type source 2810 // information. This should never happen for non-implicit methods, 2811 // but... 2812 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2813 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2814} 2815 2816/// Check for invalid uses of an abstract type within a class definition. 2817static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2818 CXXRecordDecl *RD) { 2819 for (CXXRecordDecl::decl_iterator 2820 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2821 Decl *D = *I; 2822 if (D->isImplicit()) continue; 2823 2824 // Methods and method templates. 2825 if (isa<CXXMethodDecl>(D)) { 2826 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2827 } else if (isa<FunctionTemplateDecl>(D)) { 2828 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2829 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2830 2831 // Fields and static variables. 2832 } else if (isa<FieldDecl>(D)) { 2833 FieldDecl *FD = cast<FieldDecl>(D); 2834 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2835 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2836 } else if (isa<VarDecl>(D)) { 2837 VarDecl *VD = cast<VarDecl>(D); 2838 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2839 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2840 2841 // Nested classes and class templates. 2842 } else if (isa<CXXRecordDecl>(D)) { 2843 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2844 } else if (isa<ClassTemplateDecl>(D)) { 2845 CheckAbstractClassUsage(Info, 2846 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2847 } 2848 } 2849} 2850 2851/// \brief Perform semantic checks on a class definition that has been 2852/// completing, introducing implicitly-declared members, checking for 2853/// abstract types, etc. 2854void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2855 if (!Record) 2856 return; 2857 2858 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2859 AbstractUsageInfo Info(*this, Record); 2860 CheckAbstractClassUsage(Info, Record); 2861 } 2862 2863 // If this is not an aggregate type and has no user-declared constructor, 2864 // complain about any non-static data members of reference or const scalar 2865 // type, since they will never get initializers. 2866 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2867 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2868 bool Complained = false; 2869 for (RecordDecl::field_iterator F = Record->field_begin(), 2870 FEnd = Record->field_end(); 2871 F != FEnd; ++F) { 2872 if (F->getType()->isReferenceType() || 2873 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2874 if (!Complained) { 2875 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2876 << Record->getTagKind() << Record; 2877 Complained = true; 2878 } 2879 2880 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2881 << F->getType()->isReferenceType() 2882 << F->getDeclName(); 2883 } 2884 } 2885 } 2886 2887 if (Record->isDynamicClass() && !Record->isDependentType()) 2888 DynamicClasses.push_back(Record); 2889 2890 if (Record->getIdentifier()) { 2891 // C++ [class.mem]p13: 2892 // If T is the name of a class, then each of the following shall have a 2893 // name different from T: 2894 // - every member of every anonymous union that is a member of class T. 2895 // 2896 // C++ [class.mem]p14: 2897 // In addition, if class T has a user-declared constructor (12.1), every 2898 // non-static data member of class T shall have a name different from T. 2899 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2900 R.first != R.second; ++R.first) { 2901 NamedDecl *D = *R.first; 2902 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2903 isa<IndirectFieldDecl>(D)) { 2904 Diag(D->getLocation(), diag::err_member_name_of_class) 2905 << D->getDeclName(); 2906 break; 2907 } 2908 } 2909 } 2910 2911 // Warn if the class has virtual methods but non-virtual public destructor. 2912 if (Record->isPolymorphic() && !Record->isDependentType()) { 2913 CXXDestructorDecl *dtor = Record->getDestructor(); 2914 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2915 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2916 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2917 } 2918 2919 // See if a method overloads virtual methods in a base 2920 /// class without overriding any. 2921 if (!Record->isDependentType()) { 2922 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2923 MEnd = Record->method_end(); 2924 M != MEnd; ++M) { 2925 if (!(*M)->isStatic()) 2926 DiagnoseHiddenVirtualMethods(Record, *M); 2927 } 2928 } 2929 2930 // Declare inherited constructors. We do this eagerly here because: 2931 // - The standard requires an eager diagnostic for conflicting inherited 2932 // constructors from different classes. 2933 // - The lazy declaration of the other implicit constructors is so as to not 2934 // waste space and performance on classes that are not meant to be 2935 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2936 // have inherited constructors. 2937 DeclareInheritedConstructors(Record); 2938} 2939 2940/// \brief Data used with FindHiddenVirtualMethod 2941namespace { 2942 struct FindHiddenVirtualMethodData { 2943 Sema *S; 2944 CXXMethodDecl *Method; 2945 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2946 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2947 }; 2948} 2949 2950/// \brief Member lookup function that determines whether a given C++ 2951/// method overloads virtual methods in a base class without overriding any, 2952/// to be used with CXXRecordDecl::lookupInBases(). 2953static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2954 CXXBasePath &Path, 2955 void *UserData) { 2956 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2957 2958 FindHiddenVirtualMethodData &Data 2959 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2960 2961 DeclarationName Name = Data.Method->getDeclName(); 2962 assert(Name.getNameKind() == DeclarationName::Identifier); 2963 2964 bool foundSameNameMethod = false; 2965 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2966 for (Path.Decls = BaseRecord->lookup(Name); 2967 Path.Decls.first != Path.Decls.second; 2968 ++Path.Decls.first) { 2969 NamedDecl *D = *Path.Decls.first; 2970 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2971 MD = MD->getCanonicalDecl(); 2972 foundSameNameMethod = true; 2973 // Interested only in hidden virtual methods. 2974 if (!MD->isVirtual()) 2975 continue; 2976 // If the method we are checking overrides a method from its base 2977 // don't warn about the other overloaded methods. 2978 if (!Data.S->IsOverload(Data.Method, MD, false)) 2979 return true; 2980 // Collect the overload only if its hidden. 2981 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2982 overloadedMethods.push_back(MD); 2983 } 2984 } 2985 2986 if (foundSameNameMethod) 2987 Data.OverloadedMethods.append(overloadedMethods.begin(), 2988 overloadedMethods.end()); 2989 return foundSameNameMethod; 2990} 2991 2992/// \brief See if a method overloads virtual methods in a base class without 2993/// overriding any. 2994void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2995 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2996 MD->getLocation()) == Diagnostic::Ignored) 2997 return; 2998 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 2999 return; 3000 3001 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3002 /*bool RecordPaths=*/false, 3003 /*bool DetectVirtual=*/false); 3004 FindHiddenVirtualMethodData Data; 3005 Data.Method = MD; 3006 Data.S = this; 3007 3008 // Keep the base methods that were overriden or introduced in the subclass 3009 // by 'using' in a set. A base method not in this set is hidden. 3010 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3011 res.first != res.second; ++res.first) { 3012 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3013 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3014 E = MD->end_overridden_methods(); 3015 I != E; ++I) 3016 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3017 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3018 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3019 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3020 } 3021 3022 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3023 !Data.OverloadedMethods.empty()) { 3024 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3025 << MD << (Data.OverloadedMethods.size() > 1); 3026 3027 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3028 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3029 Diag(overloadedMD->getLocation(), 3030 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3031 } 3032 } 3033} 3034 3035void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3036 Decl *TagDecl, 3037 SourceLocation LBrac, 3038 SourceLocation RBrac, 3039 AttributeList *AttrList) { 3040 if (!TagDecl) 3041 return; 3042 3043 AdjustDeclIfTemplate(TagDecl); 3044 3045 ActOnFields(S, RLoc, TagDecl, 3046 // strict aliasing violation! 3047 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3048 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3049 3050 CheckCompletedCXXClass( 3051 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3052} 3053 3054namespace { 3055 /// \brief Helper class that collects exception specifications for 3056 /// implicitly-declared special member functions. 3057 class ImplicitExceptionSpecification { 3058 ASTContext &Context; 3059 // We order exception specifications thus: 3060 // noexcept is the most restrictive, but is only used in C++0x. 3061 // throw() comes next. 3062 // Then a throw(collected exceptions) 3063 // Finally no specification. 3064 // throw(...) is used instead if any called function uses it. 3065 ExceptionSpecificationType ComputedEST; 3066 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3067 llvm::SmallVector<QualType, 4> Exceptions; 3068 3069 void ClearExceptions() { 3070 ExceptionsSeen.clear(); 3071 Exceptions.clear(); 3072 } 3073 3074 public: 3075 explicit ImplicitExceptionSpecification(ASTContext &Context) 3076 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3077 if (!Context.getLangOptions().CPlusPlus0x) 3078 ComputedEST = EST_DynamicNone; 3079 } 3080 3081 /// \brief Get the computed exception specification type. 3082 ExceptionSpecificationType getExceptionSpecType() const { 3083 assert(ComputedEST != EST_ComputedNoexcept && 3084 "noexcept(expr) should not be a possible result"); 3085 return ComputedEST; 3086 } 3087 3088 /// \brief The number of exceptions in the exception specification. 3089 unsigned size() const { return Exceptions.size(); } 3090 3091 /// \brief The set of exceptions in the exception specification. 3092 const QualType *data() const { return Exceptions.data(); } 3093 3094 /// \brief Integrate another called method into the collected data. 3095 void CalledDecl(CXXMethodDecl *Method) { 3096 // If we have an MSAny spec already, don't bother. 3097 if (!Method || ComputedEST == EST_MSAny) 3098 return; 3099 3100 const FunctionProtoType *Proto 3101 = Method->getType()->getAs<FunctionProtoType>(); 3102 3103 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3104 3105 // If this function can throw any exceptions, make a note of that. 3106 if (EST == EST_MSAny || EST == EST_None) { 3107 ClearExceptions(); 3108 ComputedEST = EST; 3109 return; 3110 } 3111 3112 // If this function has a basic noexcept, it doesn't affect the outcome. 3113 if (EST == EST_BasicNoexcept) 3114 return; 3115 3116 // If we have a throw-all spec at this point, ignore the function. 3117 if (ComputedEST == EST_None) 3118 return; 3119 3120 // If we're still at noexcept(true) and there's a nothrow() callee, 3121 // change to that specification. 3122 if (EST == EST_DynamicNone) { 3123 if (ComputedEST == EST_BasicNoexcept) 3124 ComputedEST = EST_DynamicNone; 3125 return; 3126 } 3127 3128 // Check out noexcept specs. 3129 if (EST == EST_ComputedNoexcept) { 3130 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3131 assert(NR != FunctionProtoType::NR_NoNoexcept && 3132 "Must have noexcept result for EST_ComputedNoexcept."); 3133 assert(NR != FunctionProtoType::NR_Dependent && 3134 "Should not generate implicit declarations for dependent cases, " 3135 "and don't know how to handle them anyway."); 3136 3137 // noexcept(false) -> no spec on the new function 3138 if (NR == FunctionProtoType::NR_Throw) { 3139 ClearExceptions(); 3140 ComputedEST = EST_None; 3141 } 3142 // noexcept(true) won't change anything either. 3143 return; 3144 } 3145 3146 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3147 assert(ComputedEST != EST_None && 3148 "Shouldn't collect exceptions when throw-all is guaranteed."); 3149 ComputedEST = EST_Dynamic; 3150 // Record the exceptions in this function's exception specification. 3151 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3152 EEnd = Proto->exception_end(); 3153 E != EEnd; ++E) 3154 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3155 Exceptions.push_back(*E); 3156 } 3157 }; 3158} 3159 3160 3161/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3162/// special functions, such as the default constructor, copy 3163/// constructor, or destructor, to the given C++ class (C++ 3164/// [special]p1). This routine can only be executed just before the 3165/// definition of the class is complete. 3166void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3167 if (!ClassDecl->hasUserDeclaredConstructor()) 3168 ++ASTContext::NumImplicitDefaultConstructors; 3169 3170 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3171 ++ASTContext::NumImplicitCopyConstructors; 3172 3173 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3174 ++ASTContext::NumImplicitCopyAssignmentOperators; 3175 3176 // If we have a dynamic class, then the copy assignment operator may be 3177 // virtual, so we have to declare it immediately. This ensures that, e.g., 3178 // it shows up in the right place in the vtable and that we diagnose 3179 // problems with the implicit exception specification. 3180 if (ClassDecl->isDynamicClass()) 3181 DeclareImplicitCopyAssignment(ClassDecl); 3182 } 3183 3184 if (!ClassDecl->hasUserDeclaredDestructor()) { 3185 ++ASTContext::NumImplicitDestructors; 3186 3187 // If we have a dynamic class, then the destructor may be virtual, so we 3188 // have to declare the destructor immediately. This ensures that, e.g., it 3189 // shows up in the right place in the vtable and that we diagnose problems 3190 // with the implicit exception specification. 3191 if (ClassDecl->isDynamicClass()) 3192 DeclareImplicitDestructor(ClassDecl); 3193 } 3194} 3195 3196void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3197 if (!D) 3198 return; 3199 3200 int NumParamList = D->getNumTemplateParameterLists(); 3201 for (int i = 0; i < NumParamList; i++) { 3202 TemplateParameterList* Params = D->getTemplateParameterList(i); 3203 for (TemplateParameterList::iterator Param = Params->begin(), 3204 ParamEnd = Params->end(); 3205 Param != ParamEnd; ++Param) { 3206 NamedDecl *Named = cast<NamedDecl>(*Param); 3207 if (Named->getDeclName()) { 3208 S->AddDecl(Named); 3209 IdResolver.AddDecl(Named); 3210 } 3211 } 3212 } 3213} 3214 3215void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3216 if (!D) 3217 return; 3218 3219 TemplateParameterList *Params = 0; 3220 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3221 Params = Template->getTemplateParameters(); 3222 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3223 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3224 Params = PartialSpec->getTemplateParameters(); 3225 else 3226 return; 3227 3228 for (TemplateParameterList::iterator Param = Params->begin(), 3229 ParamEnd = Params->end(); 3230 Param != ParamEnd; ++Param) { 3231 NamedDecl *Named = cast<NamedDecl>(*Param); 3232 if (Named->getDeclName()) { 3233 S->AddDecl(Named); 3234 IdResolver.AddDecl(Named); 3235 } 3236 } 3237} 3238 3239void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3240 if (!RecordD) return; 3241 AdjustDeclIfTemplate(RecordD); 3242 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3243 PushDeclContext(S, Record); 3244} 3245 3246void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3247 if (!RecordD) return; 3248 PopDeclContext(); 3249} 3250 3251/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3252/// parsing a top-level (non-nested) C++ class, and we are now 3253/// parsing those parts of the given Method declaration that could 3254/// not be parsed earlier (C++ [class.mem]p2), such as default 3255/// arguments. This action should enter the scope of the given 3256/// Method declaration as if we had just parsed the qualified method 3257/// name. However, it should not bring the parameters into scope; 3258/// that will be performed by ActOnDelayedCXXMethodParameter. 3259void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3260} 3261 3262/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3263/// C++ method declaration. We're (re-)introducing the given 3264/// function parameter into scope for use in parsing later parts of 3265/// the method declaration. For example, we could see an 3266/// ActOnParamDefaultArgument event for this parameter. 3267void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3268 if (!ParamD) 3269 return; 3270 3271 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3272 3273 // If this parameter has an unparsed default argument, clear it out 3274 // to make way for the parsed default argument. 3275 if (Param->hasUnparsedDefaultArg()) 3276 Param->setDefaultArg(0); 3277 3278 S->AddDecl(Param); 3279 if (Param->getDeclName()) 3280 IdResolver.AddDecl(Param); 3281} 3282 3283/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3284/// processing the delayed method declaration for Method. The method 3285/// declaration is now considered finished. There may be a separate 3286/// ActOnStartOfFunctionDef action later (not necessarily 3287/// immediately!) for this method, if it was also defined inside the 3288/// class body. 3289void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3290 if (!MethodD) 3291 return; 3292 3293 AdjustDeclIfTemplate(MethodD); 3294 3295 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3296 3297 // Now that we have our default arguments, check the constructor 3298 // again. It could produce additional diagnostics or affect whether 3299 // the class has implicitly-declared destructors, among other 3300 // things. 3301 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3302 CheckConstructor(Constructor); 3303 3304 // Check the default arguments, which we may have added. 3305 if (!Method->isInvalidDecl()) 3306 CheckCXXDefaultArguments(Method); 3307} 3308 3309/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3310/// the well-formedness of the constructor declarator @p D with type @p 3311/// R. If there are any errors in the declarator, this routine will 3312/// emit diagnostics and set the invalid bit to true. In any case, the type 3313/// will be updated to reflect a well-formed type for the constructor and 3314/// returned. 3315QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3316 StorageClass &SC) { 3317 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3318 3319 // C++ [class.ctor]p3: 3320 // A constructor shall not be virtual (10.3) or static (9.4). A 3321 // constructor can be invoked for a const, volatile or const 3322 // volatile object. A constructor shall not be declared const, 3323 // volatile, or const volatile (9.3.2). 3324 if (isVirtual) { 3325 if (!D.isInvalidType()) 3326 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3327 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3328 << SourceRange(D.getIdentifierLoc()); 3329 D.setInvalidType(); 3330 } 3331 if (SC == SC_Static) { 3332 if (!D.isInvalidType()) 3333 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3334 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3335 << SourceRange(D.getIdentifierLoc()); 3336 D.setInvalidType(); 3337 SC = SC_None; 3338 } 3339 3340 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3341 if (FTI.TypeQuals != 0) { 3342 if (FTI.TypeQuals & Qualifiers::Const) 3343 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3344 << "const" << SourceRange(D.getIdentifierLoc()); 3345 if (FTI.TypeQuals & Qualifiers::Volatile) 3346 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3347 << "volatile" << SourceRange(D.getIdentifierLoc()); 3348 if (FTI.TypeQuals & Qualifiers::Restrict) 3349 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3350 << "restrict" << SourceRange(D.getIdentifierLoc()); 3351 D.setInvalidType(); 3352 } 3353 3354 // C++0x [class.ctor]p4: 3355 // A constructor shall not be declared with a ref-qualifier. 3356 if (FTI.hasRefQualifier()) { 3357 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3358 << FTI.RefQualifierIsLValueRef 3359 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3360 D.setInvalidType(); 3361 } 3362 3363 // Rebuild the function type "R" without any type qualifiers (in 3364 // case any of the errors above fired) and with "void" as the 3365 // return type, since constructors don't have return types. 3366 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3367 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3368 return R; 3369 3370 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3371 EPI.TypeQuals = 0; 3372 EPI.RefQualifier = RQ_None; 3373 3374 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3375 Proto->getNumArgs(), EPI); 3376} 3377 3378/// CheckConstructor - Checks a fully-formed constructor for 3379/// well-formedness, issuing any diagnostics required. Returns true if 3380/// the constructor declarator is invalid. 3381void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3382 CXXRecordDecl *ClassDecl 3383 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3384 if (!ClassDecl) 3385 return Constructor->setInvalidDecl(); 3386 3387 // C++ [class.copy]p3: 3388 // A declaration of a constructor for a class X is ill-formed if 3389 // its first parameter is of type (optionally cv-qualified) X and 3390 // either there are no other parameters or else all other 3391 // parameters have default arguments. 3392 if (!Constructor->isInvalidDecl() && 3393 ((Constructor->getNumParams() == 1) || 3394 (Constructor->getNumParams() > 1 && 3395 Constructor->getParamDecl(1)->hasDefaultArg())) && 3396 Constructor->getTemplateSpecializationKind() 3397 != TSK_ImplicitInstantiation) { 3398 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3399 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3400 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3401 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3402 const char *ConstRef 3403 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3404 : " const &"; 3405 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3406 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3407 3408 // FIXME: Rather that making the constructor invalid, we should endeavor 3409 // to fix the type. 3410 Constructor->setInvalidDecl(); 3411 } 3412 } 3413} 3414 3415/// CheckDestructor - Checks a fully-formed destructor definition for 3416/// well-formedness, issuing any diagnostics required. Returns true 3417/// on error. 3418bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3419 CXXRecordDecl *RD = Destructor->getParent(); 3420 3421 if (Destructor->isVirtual()) { 3422 SourceLocation Loc; 3423 3424 if (!Destructor->isImplicit()) 3425 Loc = Destructor->getLocation(); 3426 else 3427 Loc = RD->getLocation(); 3428 3429 // If we have a virtual destructor, look up the deallocation function 3430 FunctionDecl *OperatorDelete = 0; 3431 DeclarationName Name = 3432 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3433 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3434 return true; 3435 3436 MarkDeclarationReferenced(Loc, OperatorDelete); 3437 3438 Destructor->setOperatorDelete(OperatorDelete); 3439 } 3440 3441 return false; 3442} 3443 3444static inline bool 3445FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3446 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3447 FTI.ArgInfo[0].Param && 3448 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3449} 3450 3451/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3452/// the well-formednes of the destructor declarator @p D with type @p 3453/// R. If there are any errors in the declarator, this routine will 3454/// emit diagnostics and set the declarator to invalid. Even if this happens, 3455/// will be updated to reflect a well-formed type for the destructor and 3456/// returned. 3457QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3458 StorageClass& SC) { 3459 // C++ [class.dtor]p1: 3460 // [...] A typedef-name that names a class is a class-name 3461 // (7.1.3); however, a typedef-name that names a class shall not 3462 // be used as the identifier in the declarator for a destructor 3463 // declaration. 3464 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3465 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3466 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3467 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3468 3469 // C++ [class.dtor]p2: 3470 // A destructor is used to destroy objects of its class type. A 3471 // destructor takes no parameters, and no return type can be 3472 // specified for it (not even void). The address of a destructor 3473 // shall not be taken. A destructor shall not be static. A 3474 // destructor can be invoked for a const, volatile or const 3475 // volatile object. A destructor shall not be declared const, 3476 // volatile or const volatile (9.3.2). 3477 if (SC == SC_Static) { 3478 if (!D.isInvalidType()) 3479 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3480 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3481 << SourceRange(D.getIdentifierLoc()) 3482 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3483 3484 SC = SC_None; 3485 } 3486 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3487 // Destructors don't have return types, but the parser will 3488 // happily parse something like: 3489 // 3490 // class X { 3491 // float ~X(); 3492 // }; 3493 // 3494 // The return type will be eliminated later. 3495 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3496 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3497 << SourceRange(D.getIdentifierLoc()); 3498 } 3499 3500 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3501 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3502 if (FTI.TypeQuals & Qualifiers::Const) 3503 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3504 << "const" << SourceRange(D.getIdentifierLoc()); 3505 if (FTI.TypeQuals & Qualifiers::Volatile) 3506 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3507 << "volatile" << SourceRange(D.getIdentifierLoc()); 3508 if (FTI.TypeQuals & Qualifiers::Restrict) 3509 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3510 << "restrict" << SourceRange(D.getIdentifierLoc()); 3511 D.setInvalidType(); 3512 } 3513 3514 // C++0x [class.dtor]p2: 3515 // A destructor shall not be declared with a ref-qualifier. 3516 if (FTI.hasRefQualifier()) { 3517 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3518 << FTI.RefQualifierIsLValueRef 3519 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3520 D.setInvalidType(); 3521 } 3522 3523 // Make sure we don't have any parameters. 3524 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3525 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3526 3527 // Delete the parameters. 3528 FTI.freeArgs(); 3529 D.setInvalidType(); 3530 } 3531 3532 // Make sure the destructor isn't variadic. 3533 if (FTI.isVariadic) { 3534 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3535 D.setInvalidType(); 3536 } 3537 3538 // Rebuild the function type "R" without any type qualifiers or 3539 // parameters (in case any of the errors above fired) and with 3540 // "void" as the return type, since destructors don't have return 3541 // types. 3542 if (!D.isInvalidType()) 3543 return R; 3544 3545 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3546 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3547 EPI.Variadic = false; 3548 EPI.TypeQuals = 0; 3549 EPI.RefQualifier = RQ_None; 3550 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3551} 3552 3553/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3554/// well-formednes of the conversion function declarator @p D with 3555/// type @p R. If there are any errors in the declarator, this routine 3556/// will emit diagnostics and return true. Otherwise, it will return 3557/// false. Either way, the type @p R will be updated to reflect a 3558/// well-formed type for the conversion operator. 3559void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3560 StorageClass& SC) { 3561 // C++ [class.conv.fct]p1: 3562 // Neither parameter types nor return type can be specified. The 3563 // type of a conversion function (8.3.5) is "function taking no 3564 // parameter returning conversion-type-id." 3565 if (SC == SC_Static) { 3566 if (!D.isInvalidType()) 3567 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3568 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3569 << SourceRange(D.getIdentifierLoc()); 3570 D.setInvalidType(); 3571 SC = SC_None; 3572 } 3573 3574 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3575 3576 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3577 // Conversion functions don't have return types, but the parser will 3578 // happily parse something like: 3579 // 3580 // class X { 3581 // float operator bool(); 3582 // }; 3583 // 3584 // The return type will be changed later anyway. 3585 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3586 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3587 << SourceRange(D.getIdentifierLoc()); 3588 D.setInvalidType(); 3589 } 3590 3591 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3592 3593 // Make sure we don't have any parameters. 3594 if (Proto->getNumArgs() > 0) { 3595 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3596 3597 // Delete the parameters. 3598 D.getFunctionTypeInfo().freeArgs(); 3599 D.setInvalidType(); 3600 } else if (Proto->isVariadic()) { 3601 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3602 D.setInvalidType(); 3603 } 3604 3605 // Diagnose "&operator bool()" and other such nonsense. This 3606 // is actually a gcc extension which we don't support. 3607 if (Proto->getResultType() != ConvType) { 3608 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3609 << Proto->getResultType(); 3610 D.setInvalidType(); 3611 ConvType = Proto->getResultType(); 3612 } 3613 3614 // C++ [class.conv.fct]p4: 3615 // The conversion-type-id shall not represent a function type nor 3616 // an array type. 3617 if (ConvType->isArrayType()) { 3618 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3619 ConvType = Context.getPointerType(ConvType); 3620 D.setInvalidType(); 3621 } else if (ConvType->isFunctionType()) { 3622 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3623 ConvType = Context.getPointerType(ConvType); 3624 D.setInvalidType(); 3625 } 3626 3627 // Rebuild the function type "R" without any parameters (in case any 3628 // of the errors above fired) and with the conversion type as the 3629 // return type. 3630 if (D.isInvalidType()) 3631 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3632 3633 // C++0x explicit conversion operators. 3634 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3635 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3636 diag::warn_explicit_conversion_functions) 3637 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3638} 3639 3640/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3641/// the declaration of the given C++ conversion function. This routine 3642/// is responsible for recording the conversion function in the C++ 3643/// class, if possible. 3644Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3645 assert(Conversion && "Expected to receive a conversion function declaration"); 3646 3647 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3648 3649 // Make sure we aren't redeclaring the conversion function. 3650 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3651 3652 // C++ [class.conv.fct]p1: 3653 // [...] A conversion function is never used to convert a 3654 // (possibly cv-qualified) object to the (possibly cv-qualified) 3655 // same object type (or a reference to it), to a (possibly 3656 // cv-qualified) base class of that type (or a reference to it), 3657 // or to (possibly cv-qualified) void. 3658 // FIXME: Suppress this warning if the conversion function ends up being a 3659 // virtual function that overrides a virtual function in a base class. 3660 QualType ClassType 3661 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3662 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3663 ConvType = ConvTypeRef->getPointeeType(); 3664 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3665 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3666 /* Suppress diagnostics for instantiations. */; 3667 else if (ConvType->isRecordType()) { 3668 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3669 if (ConvType == ClassType) 3670 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3671 << ClassType; 3672 else if (IsDerivedFrom(ClassType, ConvType)) 3673 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3674 << ClassType << ConvType; 3675 } else if (ConvType->isVoidType()) { 3676 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3677 << ClassType << ConvType; 3678 } 3679 3680 if (FunctionTemplateDecl *ConversionTemplate 3681 = Conversion->getDescribedFunctionTemplate()) 3682 return ConversionTemplate; 3683 3684 return Conversion; 3685} 3686 3687//===----------------------------------------------------------------------===// 3688// Namespace Handling 3689//===----------------------------------------------------------------------===// 3690 3691 3692 3693/// ActOnStartNamespaceDef - This is called at the start of a namespace 3694/// definition. 3695Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3696 SourceLocation InlineLoc, 3697 SourceLocation NamespaceLoc, 3698 SourceLocation IdentLoc, 3699 IdentifierInfo *II, 3700 SourceLocation LBrace, 3701 AttributeList *AttrList) { 3702 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3703 // For anonymous namespace, take the location of the left brace. 3704 SourceLocation Loc = II ? IdentLoc : LBrace; 3705 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3706 StartLoc, Loc, II); 3707 Namespc->setInline(InlineLoc.isValid()); 3708 3709 Scope *DeclRegionScope = NamespcScope->getParent(); 3710 3711 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3712 3713 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3714 PushNamespaceVisibilityAttr(Attr); 3715 3716 if (II) { 3717 // C++ [namespace.def]p2: 3718 // The identifier in an original-namespace-definition shall not 3719 // have been previously defined in the declarative region in 3720 // which the original-namespace-definition appears. The 3721 // identifier in an original-namespace-definition is the name of 3722 // the namespace. Subsequently in that declarative region, it is 3723 // treated as an original-namespace-name. 3724 // 3725 // Since namespace names are unique in their scope, and we don't 3726 // look through using directives, just 3727 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3728 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3729 3730 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3731 // This is an extended namespace definition. 3732 if (Namespc->isInline() != OrigNS->isInline()) { 3733 // inline-ness must match 3734 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3735 << Namespc->isInline(); 3736 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3737 Namespc->setInvalidDecl(); 3738 // Recover by ignoring the new namespace's inline status. 3739 Namespc->setInline(OrigNS->isInline()); 3740 } 3741 3742 // Attach this namespace decl to the chain of extended namespace 3743 // definitions. 3744 OrigNS->setNextNamespace(Namespc); 3745 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3746 3747 // Remove the previous declaration from the scope. 3748 if (DeclRegionScope->isDeclScope(OrigNS)) { 3749 IdResolver.RemoveDecl(OrigNS); 3750 DeclRegionScope->RemoveDecl(OrigNS); 3751 } 3752 } else if (PrevDecl) { 3753 // This is an invalid name redefinition. 3754 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3755 << Namespc->getDeclName(); 3756 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3757 Namespc->setInvalidDecl(); 3758 // Continue on to push Namespc as current DeclContext and return it. 3759 } else if (II->isStr("std") && 3760 CurContext->getRedeclContext()->isTranslationUnit()) { 3761 // This is the first "real" definition of the namespace "std", so update 3762 // our cache of the "std" namespace to point at this definition. 3763 if (NamespaceDecl *StdNS = getStdNamespace()) { 3764 // We had already defined a dummy namespace "std". Link this new 3765 // namespace definition to the dummy namespace "std". 3766 StdNS->setNextNamespace(Namespc); 3767 StdNS->setLocation(IdentLoc); 3768 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3769 } 3770 3771 // Make our StdNamespace cache point at the first real definition of the 3772 // "std" namespace. 3773 StdNamespace = Namespc; 3774 } 3775 3776 PushOnScopeChains(Namespc, DeclRegionScope); 3777 } else { 3778 // Anonymous namespaces. 3779 assert(Namespc->isAnonymousNamespace()); 3780 3781 // Link the anonymous namespace into its parent. 3782 NamespaceDecl *PrevDecl; 3783 DeclContext *Parent = CurContext->getRedeclContext(); 3784 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3785 PrevDecl = TU->getAnonymousNamespace(); 3786 TU->setAnonymousNamespace(Namespc); 3787 } else { 3788 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3789 PrevDecl = ND->getAnonymousNamespace(); 3790 ND->setAnonymousNamespace(Namespc); 3791 } 3792 3793 // Link the anonymous namespace with its previous declaration. 3794 if (PrevDecl) { 3795 assert(PrevDecl->isAnonymousNamespace()); 3796 assert(!PrevDecl->getNextNamespace()); 3797 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3798 PrevDecl->setNextNamespace(Namespc); 3799 3800 if (Namespc->isInline() != PrevDecl->isInline()) { 3801 // inline-ness must match 3802 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3803 << Namespc->isInline(); 3804 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3805 Namespc->setInvalidDecl(); 3806 // Recover by ignoring the new namespace's inline status. 3807 Namespc->setInline(PrevDecl->isInline()); 3808 } 3809 } 3810 3811 CurContext->addDecl(Namespc); 3812 3813 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3814 // behaves as if it were replaced by 3815 // namespace unique { /* empty body */ } 3816 // using namespace unique; 3817 // namespace unique { namespace-body } 3818 // where all occurrences of 'unique' in a translation unit are 3819 // replaced by the same identifier and this identifier differs 3820 // from all other identifiers in the entire program. 3821 3822 // We just create the namespace with an empty name and then add an 3823 // implicit using declaration, just like the standard suggests. 3824 // 3825 // CodeGen enforces the "universally unique" aspect by giving all 3826 // declarations semantically contained within an anonymous 3827 // namespace internal linkage. 3828 3829 if (!PrevDecl) { 3830 UsingDirectiveDecl* UD 3831 = UsingDirectiveDecl::Create(Context, CurContext, 3832 /* 'using' */ LBrace, 3833 /* 'namespace' */ SourceLocation(), 3834 /* qualifier */ NestedNameSpecifierLoc(), 3835 /* identifier */ SourceLocation(), 3836 Namespc, 3837 /* Ancestor */ CurContext); 3838 UD->setImplicit(); 3839 CurContext->addDecl(UD); 3840 } 3841 } 3842 3843 // Although we could have an invalid decl (i.e. the namespace name is a 3844 // redefinition), push it as current DeclContext and try to continue parsing. 3845 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3846 // for the namespace has the declarations that showed up in that particular 3847 // namespace definition. 3848 PushDeclContext(NamespcScope, Namespc); 3849 return Namespc; 3850} 3851 3852/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3853/// is a namespace alias, returns the namespace it points to. 3854static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3855 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3856 return AD->getNamespace(); 3857 return dyn_cast_or_null<NamespaceDecl>(D); 3858} 3859 3860/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3861/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3862void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3863 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3864 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3865 Namespc->setRBraceLoc(RBrace); 3866 PopDeclContext(); 3867 if (Namespc->hasAttr<VisibilityAttr>()) 3868 PopPragmaVisibility(); 3869} 3870 3871CXXRecordDecl *Sema::getStdBadAlloc() const { 3872 return cast_or_null<CXXRecordDecl>( 3873 StdBadAlloc.get(Context.getExternalSource())); 3874} 3875 3876NamespaceDecl *Sema::getStdNamespace() const { 3877 return cast_or_null<NamespaceDecl>( 3878 StdNamespace.get(Context.getExternalSource())); 3879} 3880 3881/// \brief Retrieve the special "std" namespace, which may require us to 3882/// implicitly define the namespace. 3883NamespaceDecl *Sema::getOrCreateStdNamespace() { 3884 if (!StdNamespace) { 3885 // The "std" namespace has not yet been defined, so build one implicitly. 3886 StdNamespace = NamespaceDecl::Create(Context, 3887 Context.getTranslationUnitDecl(), 3888 SourceLocation(), SourceLocation(), 3889 &PP.getIdentifierTable().get("std")); 3890 getStdNamespace()->setImplicit(true); 3891 } 3892 3893 return getStdNamespace(); 3894} 3895 3896/// \brief Determine whether a using statement is in a context where it will be 3897/// apply in all contexts. 3898static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3899 switch (CurContext->getDeclKind()) { 3900 case Decl::TranslationUnit: 3901 return true; 3902 case Decl::LinkageSpec: 3903 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3904 default: 3905 return false; 3906 } 3907} 3908 3909Decl *Sema::ActOnUsingDirective(Scope *S, 3910 SourceLocation UsingLoc, 3911 SourceLocation NamespcLoc, 3912 CXXScopeSpec &SS, 3913 SourceLocation IdentLoc, 3914 IdentifierInfo *NamespcName, 3915 AttributeList *AttrList) { 3916 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3917 assert(NamespcName && "Invalid NamespcName."); 3918 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3919 3920 // This can only happen along a recovery path. 3921 while (S->getFlags() & Scope::TemplateParamScope) 3922 S = S->getParent(); 3923 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3924 3925 UsingDirectiveDecl *UDir = 0; 3926 NestedNameSpecifier *Qualifier = 0; 3927 if (SS.isSet()) 3928 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3929 3930 // Lookup namespace name. 3931 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3932 LookupParsedName(R, S, &SS); 3933 if (R.isAmbiguous()) 3934 return 0; 3935 3936 if (R.empty()) { 3937 // Allow "using namespace std;" or "using namespace ::std;" even if 3938 // "std" hasn't been defined yet, for GCC compatibility. 3939 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3940 NamespcName->isStr("std")) { 3941 Diag(IdentLoc, diag::ext_using_undefined_std); 3942 R.addDecl(getOrCreateStdNamespace()); 3943 R.resolveKind(); 3944 } 3945 // Otherwise, attempt typo correction. 3946 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3947 CTC_NoKeywords, 0)) { 3948 if (R.getAsSingle<NamespaceDecl>() || 3949 R.getAsSingle<NamespaceAliasDecl>()) { 3950 if (DeclContext *DC = computeDeclContext(SS, false)) 3951 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3952 << NamespcName << DC << Corrected << SS.getRange() 3953 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3954 else 3955 Diag(IdentLoc, diag::err_using_directive_suggest) 3956 << NamespcName << Corrected 3957 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3958 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3959 << Corrected; 3960 3961 NamespcName = Corrected.getAsIdentifierInfo(); 3962 } else { 3963 R.clear(); 3964 R.setLookupName(NamespcName); 3965 } 3966 } 3967 } 3968 3969 if (!R.empty()) { 3970 NamedDecl *Named = R.getFoundDecl(); 3971 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3972 && "expected namespace decl"); 3973 // C++ [namespace.udir]p1: 3974 // A using-directive specifies that the names in the nominated 3975 // namespace can be used in the scope in which the 3976 // using-directive appears after the using-directive. During 3977 // unqualified name lookup (3.4.1), the names appear as if they 3978 // were declared in the nearest enclosing namespace which 3979 // contains both the using-directive and the nominated 3980 // namespace. [Note: in this context, "contains" means "contains 3981 // directly or indirectly". ] 3982 3983 // Find enclosing context containing both using-directive and 3984 // nominated namespace. 3985 NamespaceDecl *NS = getNamespaceDecl(Named); 3986 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3987 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3988 CommonAncestor = CommonAncestor->getParent(); 3989 3990 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3991 SS.getWithLocInContext(Context), 3992 IdentLoc, Named, CommonAncestor); 3993 3994 if (IsUsingDirectiveInToplevelContext(CurContext) && 3995 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 3996 Diag(IdentLoc, diag::warn_using_directive_in_header); 3997 } 3998 3999 PushUsingDirective(S, UDir); 4000 } else { 4001 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4002 } 4003 4004 // FIXME: We ignore attributes for now. 4005 return UDir; 4006} 4007 4008void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4009 // If scope has associated entity, then using directive is at namespace 4010 // or translation unit scope. We add UsingDirectiveDecls, into 4011 // it's lookup structure. 4012 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4013 Ctx->addDecl(UDir); 4014 else 4015 // Otherwise it is block-sope. using-directives will affect lookup 4016 // only to the end of scope. 4017 S->PushUsingDirective(UDir); 4018} 4019 4020 4021Decl *Sema::ActOnUsingDeclaration(Scope *S, 4022 AccessSpecifier AS, 4023 bool HasUsingKeyword, 4024 SourceLocation UsingLoc, 4025 CXXScopeSpec &SS, 4026 UnqualifiedId &Name, 4027 AttributeList *AttrList, 4028 bool IsTypeName, 4029 SourceLocation TypenameLoc) { 4030 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4031 4032 switch (Name.getKind()) { 4033 case UnqualifiedId::IK_Identifier: 4034 case UnqualifiedId::IK_OperatorFunctionId: 4035 case UnqualifiedId::IK_LiteralOperatorId: 4036 case UnqualifiedId::IK_ConversionFunctionId: 4037 break; 4038 4039 case UnqualifiedId::IK_ConstructorName: 4040 case UnqualifiedId::IK_ConstructorTemplateId: 4041 // C++0x inherited constructors. 4042 if (getLangOptions().CPlusPlus0x) break; 4043 4044 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4045 << SS.getRange(); 4046 return 0; 4047 4048 case UnqualifiedId::IK_DestructorName: 4049 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4050 << SS.getRange(); 4051 return 0; 4052 4053 case UnqualifiedId::IK_TemplateId: 4054 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4055 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4056 return 0; 4057 } 4058 4059 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4060 DeclarationName TargetName = TargetNameInfo.getName(); 4061 if (!TargetName) 4062 return 0; 4063 4064 // Warn about using declarations. 4065 // TODO: store that the declaration was written without 'using' and 4066 // talk about access decls instead of using decls in the 4067 // diagnostics. 4068 if (!HasUsingKeyword) { 4069 UsingLoc = Name.getSourceRange().getBegin(); 4070 4071 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4072 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4073 } 4074 4075 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4076 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4077 return 0; 4078 4079 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4080 TargetNameInfo, AttrList, 4081 /* IsInstantiation */ false, 4082 IsTypeName, TypenameLoc); 4083 if (UD) 4084 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4085 4086 return UD; 4087} 4088 4089/// \brief Determine whether a using declaration considers the given 4090/// declarations as "equivalent", e.g., if they are redeclarations of 4091/// the same entity or are both typedefs of the same type. 4092static bool 4093IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4094 bool &SuppressRedeclaration) { 4095 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4096 SuppressRedeclaration = false; 4097 return true; 4098 } 4099 4100 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4101 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4102 SuppressRedeclaration = true; 4103 return Context.hasSameType(TD1->getUnderlyingType(), 4104 TD2->getUnderlyingType()); 4105 } 4106 4107 return false; 4108} 4109 4110 4111/// Determines whether to create a using shadow decl for a particular 4112/// decl, given the set of decls existing prior to this using lookup. 4113bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4114 const LookupResult &Previous) { 4115 // Diagnose finding a decl which is not from a base class of the 4116 // current class. We do this now because there are cases where this 4117 // function will silently decide not to build a shadow decl, which 4118 // will pre-empt further diagnostics. 4119 // 4120 // We don't need to do this in C++0x because we do the check once on 4121 // the qualifier. 4122 // 4123 // FIXME: diagnose the following if we care enough: 4124 // struct A { int foo; }; 4125 // struct B : A { using A::foo; }; 4126 // template <class T> struct C : A {}; 4127 // template <class T> struct D : C<T> { using B::foo; } // <--- 4128 // This is invalid (during instantiation) in C++03 because B::foo 4129 // resolves to the using decl in B, which is not a base class of D<T>. 4130 // We can't diagnose it immediately because C<T> is an unknown 4131 // specialization. The UsingShadowDecl in D<T> then points directly 4132 // to A::foo, which will look well-formed when we instantiate. 4133 // The right solution is to not collapse the shadow-decl chain. 4134 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4135 DeclContext *OrigDC = Orig->getDeclContext(); 4136 4137 // Handle enums and anonymous structs. 4138 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4139 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4140 while (OrigRec->isAnonymousStructOrUnion()) 4141 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4142 4143 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4144 if (OrigDC == CurContext) { 4145 Diag(Using->getLocation(), 4146 diag::err_using_decl_nested_name_specifier_is_current_class) 4147 << Using->getQualifierLoc().getSourceRange(); 4148 Diag(Orig->getLocation(), diag::note_using_decl_target); 4149 return true; 4150 } 4151 4152 Diag(Using->getQualifierLoc().getBeginLoc(), 4153 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4154 << Using->getQualifier() 4155 << cast<CXXRecordDecl>(CurContext) 4156 << Using->getQualifierLoc().getSourceRange(); 4157 Diag(Orig->getLocation(), diag::note_using_decl_target); 4158 return true; 4159 } 4160 } 4161 4162 if (Previous.empty()) return false; 4163 4164 NamedDecl *Target = Orig; 4165 if (isa<UsingShadowDecl>(Target)) 4166 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4167 4168 // If the target happens to be one of the previous declarations, we 4169 // don't have a conflict. 4170 // 4171 // FIXME: but we might be increasing its access, in which case we 4172 // should redeclare it. 4173 NamedDecl *NonTag = 0, *Tag = 0; 4174 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4175 I != E; ++I) { 4176 NamedDecl *D = (*I)->getUnderlyingDecl(); 4177 bool Result; 4178 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4179 return Result; 4180 4181 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4182 } 4183 4184 if (Target->isFunctionOrFunctionTemplate()) { 4185 FunctionDecl *FD; 4186 if (isa<FunctionTemplateDecl>(Target)) 4187 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4188 else 4189 FD = cast<FunctionDecl>(Target); 4190 4191 NamedDecl *OldDecl = 0; 4192 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4193 case Ovl_Overload: 4194 return false; 4195 4196 case Ovl_NonFunction: 4197 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4198 break; 4199 4200 // We found a decl with the exact signature. 4201 case Ovl_Match: 4202 // If we're in a record, we want to hide the target, so we 4203 // return true (without a diagnostic) to tell the caller not to 4204 // build a shadow decl. 4205 if (CurContext->isRecord()) 4206 return true; 4207 4208 // If we're not in a record, this is an error. 4209 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4210 break; 4211 } 4212 4213 Diag(Target->getLocation(), diag::note_using_decl_target); 4214 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4215 return true; 4216 } 4217 4218 // Target is not a function. 4219 4220 if (isa<TagDecl>(Target)) { 4221 // No conflict between a tag and a non-tag. 4222 if (!Tag) return false; 4223 4224 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4225 Diag(Target->getLocation(), diag::note_using_decl_target); 4226 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4227 return true; 4228 } 4229 4230 // No conflict between a tag and a non-tag. 4231 if (!NonTag) return false; 4232 4233 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4234 Diag(Target->getLocation(), diag::note_using_decl_target); 4235 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4236 return true; 4237} 4238 4239/// Builds a shadow declaration corresponding to a 'using' declaration. 4240UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4241 UsingDecl *UD, 4242 NamedDecl *Orig) { 4243 4244 // If we resolved to another shadow declaration, just coalesce them. 4245 NamedDecl *Target = Orig; 4246 if (isa<UsingShadowDecl>(Target)) { 4247 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4248 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4249 } 4250 4251 UsingShadowDecl *Shadow 4252 = UsingShadowDecl::Create(Context, CurContext, 4253 UD->getLocation(), UD, Target); 4254 UD->addShadowDecl(Shadow); 4255 4256 Shadow->setAccess(UD->getAccess()); 4257 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4258 Shadow->setInvalidDecl(); 4259 4260 if (S) 4261 PushOnScopeChains(Shadow, S); 4262 else 4263 CurContext->addDecl(Shadow); 4264 4265 4266 return Shadow; 4267} 4268 4269/// Hides a using shadow declaration. This is required by the current 4270/// using-decl implementation when a resolvable using declaration in a 4271/// class is followed by a declaration which would hide or override 4272/// one or more of the using decl's targets; for example: 4273/// 4274/// struct Base { void foo(int); }; 4275/// struct Derived : Base { 4276/// using Base::foo; 4277/// void foo(int); 4278/// }; 4279/// 4280/// The governing language is C++03 [namespace.udecl]p12: 4281/// 4282/// When a using-declaration brings names from a base class into a 4283/// derived class scope, member functions in the derived class 4284/// override and/or hide member functions with the same name and 4285/// parameter types in a base class (rather than conflicting). 4286/// 4287/// There are two ways to implement this: 4288/// (1) optimistically create shadow decls when they're not hidden 4289/// by existing declarations, or 4290/// (2) don't create any shadow decls (or at least don't make them 4291/// visible) until we've fully parsed/instantiated the class. 4292/// The problem with (1) is that we might have to retroactively remove 4293/// a shadow decl, which requires several O(n) operations because the 4294/// decl structures are (very reasonably) not designed for removal. 4295/// (2) avoids this but is very fiddly and phase-dependent. 4296void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4297 if (Shadow->getDeclName().getNameKind() == 4298 DeclarationName::CXXConversionFunctionName) 4299 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4300 4301 // Remove it from the DeclContext... 4302 Shadow->getDeclContext()->removeDecl(Shadow); 4303 4304 // ...and the scope, if applicable... 4305 if (S) { 4306 S->RemoveDecl(Shadow); 4307 IdResolver.RemoveDecl(Shadow); 4308 } 4309 4310 // ...and the using decl. 4311 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4312 4313 // TODO: complain somehow if Shadow was used. It shouldn't 4314 // be possible for this to happen, because...? 4315} 4316 4317/// Builds a using declaration. 4318/// 4319/// \param IsInstantiation - Whether this call arises from an 4320/// instantiation of an unresolved using declaration. We treat 4321/// the lookup differently for these declarations. 4322NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4323 SourceLocation UsingLoc, 4324 CXXScopeSpec &SS, 4325 const DeclarationNameInfo &NameInfo, 4326 AttributeList *AttrList, 4327 bool IsInstantiation, 4328 bool IsTypeName, 4329 SourceLocation TypenameLoc) { 4330 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4331 SourceLocation IdentLoc = NameInfo.getLoc(); 4332 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4333 4334 // FIXME: We ignore attributes for now. 4335 4336 if (SS.isEmpty()) { 4337 Diag(IdentLoc, diag::err_using_requires_qualname); 4338 return 0; 4339 } 4340 4341 // Do the redeclaration lookup in the current scope. 4342 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4343 ForRedeclaration); 4344 Previous.setHideTags(false); 4345 if (S) { 4346 LookupName(Previous, S); 4347 4348 // It is really dumb that we have to do this. 4349 LookupResult::Filter F = Previous.makeFilter(); 4350 while (F.hasNext()) { 4351 NamedDecl *D = F.next(); 4352 if (!isDeclInScope(D, CurContext, S)) 4353 F.erase(); 4354 } 4355 F.done(); 4356 } else { 4357 assert(IsInstantiation && "no scope in non-instantiation"); 4358 assert(CurContext->isRecord() && "scope not record in instantiation"); 4359 LookupQualifiedName(Previous, CurContext); 4360 } 4361 4362 // Check for invalid redeclarations. 4363 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4364 return 0; 4365 4366 // Check for bad qualifiers. 4367 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4368 return 0; 4369 4370 DeclContext *LookupContext = computeDeclContext(SS); 4371 NamedDecl *D; 4372 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4373 if (!LookupContext) { 4374 if (IsTypeName) { 4375 // FIXME: not all declaration name kinds are legal here 4376 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4377 UsingLoc, TypenameLoc, 4378 QualifierLoc, 4379 IdentLoc, NameInfo.getName()); 4380 } else { 4381 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4382 QualifierLoc, NameInfo); 4383 } 4384 } else { 4385 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4386 NameInfo, IsTypeName); 4387 } 4388 D->setAccess(AS); 4389 CurContext->addDecl(D); 4390 4391 if (!LookupContext) return D; 4392 UsingDecl *UD = cast<UsingDecl>(D); 4393 4394 if (RequireCompleteDeclContext(SS, LookupContext)) { 4395 UD->setInvalidDecl(); 4396 return UD; 4397 } 4398 4399 // Constructor inheriting using decls get special treatment. 4400 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4401 if (CheckInheritedConstructorUsingDecl(UD)) 4402 UD->setInvalidDecl(); 4403 return UD; 4404 } 4405 4406 // Otherwise, look up the target name. 4407 4408 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4409 4410 // Unlike most lookups, we don't always want to hide tag 4411 // declarations: tag names are visible through the using declaration 4412 // even if hidden by ordinary names, *except* in a dependent context 4413 // where it's important for the sanity of two-phase lookup. 4414 if (!IsInstantiation) 4415 R.setHideTags(false); 4416 4417 LookupQualifiedName(R, LookupContext); 4418 4419 if (R.empty()) { 4420 Diag(IdentLoc, diag::err_no_member) 4421 << NameInfo.getName() << LookupContext << SS.getRange(); 4422 UD->setInvalidDecl(); 4423 return UD; 4424 } 4425 4426 if (R.isAmbiguous()) { 4427 UD->setInvalidDecl(); 4428 return UD; 4429 } 4430 4431 if (IsTypeName) { 4432 // If we asked for a typename and got a non-type decl, error out. 4433 if (!R.getAsSingle<TypeDecl>()) { 4434 Diag(IdentLoc, diag::err_using_typename_non_type); 4435 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4436 Diag((*I)->getUnderlyingDecl()->getLocation(), 4437 diag::note_using_decl_target); 4438 UD->setInvalidDecl(); 4439 return UD; 4440 } 4441 } else { 4442 // If we asked for a non-typename and we got a type, error out, 4443 // but only if this is an instantiation of an unresolved using 4444 // decl. Otherwise just silently find the type name. 4445 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4446 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4447 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4448 UD->setInvalidDecl(); 4449 return UD; 4450 } 4451 } 4452 4453 // C++0x N2914 [namespace.udecl]p6: 4454 // A using-declaration shall not name a namespace. 4455 if (R.getAsSingle<NamespaceDecl>()) { 4456 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4457 << SS.getRange(); 4458 UD->setInvalidDecl(); 4459 return UD; 4460 } 4461 4462 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4463 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4464 BuildUsingShadowDecl(S, UD, *I); 4465 } 4466 4467 return UD; 4468} 4469 4470/// Additional checks for a using declaration referring to a constructor name. 4471bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4472 if (UD->isTypeName()) { 4473 // FIXME: Cannot specify typename when specifying constructor 4474 return true; 4475 } 4476 4477 const Type *SourceType = UD->getQualifier()->getAsType(); 4478 assert(SourceType && 4479 "Using decl naming constructor doesn't have type in scope spec."); 4480 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4481 4482 // Check whether the named type is a direct base class. 4483 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4484 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4485 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4486 BaseIt != BaseE; ++BaseIt) { 4487 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4488 if (CanonicalSourceType == BaseType) 4489 break; 4490 } 4491 4492 if (BaseIt == BaseE) { 4493 // Did not find SourceType in the bases. 4494 Diag(UD->getUsingLocation(), 4495 diag::err_using_decl_constructor_not_in_direct_base) 4496 << UD->getNameInfo().getSourceRange() 4497 << QualType(SourceType, 0) << TargetClass; 4498 return true; 4499 } 4500 4501 BaseIt->setInheritConstructors(); 4502 4503 return false; 4504} 4505 4506/// Checks that the given using declaration is not an invalid 4507/// redeclaration. Note that this is checking only for the using decl 4508/// itself, not for any ill-formedness among the UsingShadowDecls. 4509bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4510 bool isTypeName, 4511 const CXXScopeSpec &SS, 4512 SourceLocation NameLoc, 4513 const LookupResult &Prev) { 4514 // C++03 [namespace.udecl]p8: 4515 // C++0x [namespace.udecl]p10: 4516 // A using-declaration is a declaration and can therefore be used 4517 // repeatedly where (and only where) multiple declarations are 4518 // allowed. 4519 // 4520 // That's in non-member contexts. 4521 if (!CurContext->getRedeclContext()->isRecord()) 4522 return false; 4523 4524 NestedNameSpecifier *Qual 4525 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4526 4527 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4528 NamedDecl *D = *I; 4529 4530 bool DTypename; 4531 NestedNameSpecifier *DQual; 4532 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4533 DTypename = UD->isTypeName(); 4534 DQual = UD->getQualifier(); 4535 } else if (UnresolvedUsingValueDecl *UD 4536 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4537 DTypename = false; 4538 DQual = UD->getQualifier(); 4539 } else if (UnresolvedUsingTypenameDecl *UD 4540 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4541 DTypename = true; 4542 DQual = UD->getQualifier(); 4543 } else continue; 4544 4545 // using decls differ if one says 'typename' and the other doesn't. 4546 // FIXME: non-dependent using decls? 4547 if (isTypeName != DTypename) continue; 4548 4549 // using decls differ if they name different scopes (but note that 4550 // template instantiation can cause this check to trigger when it 4551 // didn't before instantiation). 4552 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4553 Context.getCanonicalNestedNameSpecifier(DQual)) 4554 continue; 4555 4556 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4557 Diag(D->getLocation(), diag::note_using_decl) << 1; 4558 return true; 4559 } 4560 4561 return false; 4562} 4563 4564 4565/// Checks that the given nested-name qualifier used in a using decl 4566/// in the current context is appropriately related to the current 4567/// scope. If an error is found, diagnoses it and returns true. 4568bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4569 const CXXScopeSpec &SS, 4570 SourceLocation NameLoc) { 4571 DeclContext *NamedContext = computeDeclContext(SS); 4572 4573 if (!CurContext->isRecord()) { 4574 // C++03 [namespace.udecl]p3: 4575 // C++0x [namespace.udecl]p8: 4576 // A using-declaration for a class member shall be a member-declaration. 4577 4578 // If we weren't able to compute a valid scope, it must be a 4579 // dependent class scope. 4580 if (!NamedContext || NamedContext->isRecord()) { 4581 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4582 << SS.getRange(); 4583 return true; 4584 } 4585 4586 // Otherwise, everything is known to be fine. 4587 return false; 4588 } 4589 4590 // The current scope is a record. 4591 4592 // If the named context is dependent, we can't decide much. 4593 if (!NamedContext) { 4594 // FIXME: in C++0x, we can diagnose if we can prove that the 4595 // nested-name-specifier does not refer to a base class, which is 4596 // still possible in some cases. 4597 4598 // Otherwise we have to conservatively report that things might be 4599 // okay. 4600 return false; 4601 } 4602 4603 if (!NamedContext->isRecord()) { 4604 // Ideally this would point at the last name in the specifier, 4605 // but we don't have that level of source info. 4606 Diag(SS.getRange().getBegin(), 4607 diag::err_using_decl_nested_name_specifier_is_not_class) 4608 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4609 return true; 4610 } 4611 4612 if (!NamedContext->isDependentContext() && 4613 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4614 return true; 4615 4616 if (getLangOptions().CPlusPlus0x) { 4617 // C++0x [namespace.udecl]p3: 4618 // In a using-declaration used as a member-declaration, the 4619 // nested-name-specifier shall name a base class of the class 4620 // being defined. 4621 4622 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4623 cast<CXXRecordDecl>(NamedContext))) { 4624 if (CurContext == NamedContext) { 4625 Diag(NameLoc, 4626 diag::err_using_decl_nested_name_specifier_is_current_class) 4627 << SS.getRange(); 4628 return true; 4629 } 4630 4631 Diag(SS.getRange().getBegin(), 4632 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4633 << (NestedNameSpecifier*) SS.getScopeRep() 4634 << cast<CXXRecordDecl>(CurContext) 4635 << SS.getRange(); 4636 return true; 4637 } 4638 4639 return false; 4640 } 4641 4642 // C++03 [namespace.udecl]p4: 4643 // A using-declaration used as a member-declaration shall refer 4644 // to a member of a base class of the class being defined [etc.]. 4645 4646 // Salient point: SS doesn't have to name a base class as long as 4647 // lookup only finds members from base classes. Therefore we can 4648 // diagnose here only if we can prove that that can't happen, 4649 // i.e. if the class hierarchies provably don't intersect. 4650 4651 // TODO: it would be nice if "definitely valid" results were cached 4652 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4653 // need to be repeated. 4654 4655 struct UserData { 4656 llvm::DenseSet<const CXXRecordDecl*> Bases; 4657 4658 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4659 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4660 Data->Bases.insert(Base); 4661 return true; 4662 } 4663 4664 bool hasDependentBases(const CXXRecordDecl *Class) { 4665 return !Class->forallBases(collect, this); 4666 } 4667 4668 /// Returns true if the base is dependent or is one of the 4669 /// accumulated base classes. 4670 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4671 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4672 return !Data->Bases.count(Base); 4673 } 4674 4675 bool mightShareBases(const CXXRecordDecl *Class) { 4676 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4677 } 4678 }; 4679 4680 UserData Data; 4681 4682 // Returns false if we find a dependent base. 4683 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4684 return false; 4685 4686 // Returns false if the class has a dependent base or if it or one 4687 // of its bases is present in the base set of the current context. 4688 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4689 return false; 4690 4691 Diag(SS.getRange().getBegin(), 4692 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4693 << (NestedNameSpecifier*) SS.getScopeRep() 4694 << cast<CXXRecordDecl>(CurContext) 4695 << SS.getRange(); 4696 4697 return true; 4698} 4699 4700Decl *Sema::ActOnAliasDeclaration(Scope *S, 4701 AccessSpecifier AS, 4702 SourceLocation UsingLoc, 4703 UnqualifiedId &Name, 4704 TypeResult Type) { 4705 assert((S->getFlags() & Scope::DeclScope) && 4706 "got alias-declaration outside of declaration scope"); 4707 4708 if (Type.isInvalid()) 4709 return 0; 4710 4711 bool Invalid = false; 4712 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4713 TypeSourceInfo *TInfo = 0; 4714 GetTypeFromParser(Type.get(), &TInfo); 4715 4716 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4717 return 0; 4718 4719 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4720 UPPC_DeclarationType)) 4721 Invalid = true; 4722 4723 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4724 LookupName(Previous, S); 4725 4726 // Warn about shadowing the name of a template parameter. 4727 if (Previous.isSingleResult() && 4728 Previous.getFoundDecl()->isTemplateParameter()) { 4729 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4730 Previous.getFoundDecl())) 4731 Invalid = true; 4732 Previous.clear(); 4733 } 4734 4735 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4736 "name in alias declaration must be an identifier"); 4737 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4738 Name.StartLocation, 4739 Name.Identifier, TInfo); 4740 4741 NewTD->setAccess(AS); 4742 4743 if (Invalid) 4744 NewTD->setInvalidDecl(); 4745 4746 bool Redeclaration = false; 4747 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4748 4749 if (!Redeclaration) 4750 PushOnScopeChains(NewTD, S); 4751 4752 return NewTD; 4753} 4754 4755Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4756 SourceLocation NamespaceLoc, 4757 SourceLocation AliasLoc, 4758 IdentifierInfo *Alias, 4759 CXXScopeSpec &SS, 4760 SourceLocation IdentLoc, 4761 IdentifierInfo *Ident) { 4762 4763 // Lookup the namespace name. 4764 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4765 LookupParsedName(R, S, &SS); 4766 4767 // Check if we have a previous declaration with the same name. 4768 NamedDecl *PrevDecl 4769 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4770 ForRedeclaration); 4771 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4772 PrevDecl = 0; 4773 4774 if (PrevDecl) { 4775 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4776 // We already have an alias with the same name that points to the same 4777 // namespace, so don't create a new one. 4778 // FIXME: At some point, we'll want to create the (redundant) 4779 // declaration to maintain better source information. 4780 if (!R.isAmbiguous() && !R.empty() && 4781 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4782 return 0; 4783 } 4784 4785 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4786 diag::err_redefinition_different_kind; 4787 Diag(AliasLoc, DiagID) << Alias; 4788 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4789 return 0; 4790 } 4791 4792 if (R.isAmbiguous()) 4793 return 0; 4794 4795 if (R.empty()) { 4796 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4797 CTC_NoKeywords, 0)) { 4798 if (R.getAsSingle<NamespaceDecl>() || 4799 R.getAsSingle<NamespaceAliasDecl>()) { 4800 if (DeclContext *DC = computeDeclContext(SS, false)) 4801 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4802 << Ident << DC << Corrected << SS.getRange() 4803 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4804 else 4805 Diag(IdentLoc, diag::err_using_directive_suggest) 4806 << Ident << Corrected 4807 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4808 4809 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4810 << Corrected; 4811 4812 Ident = Corrected.getAsIdentifierInfo(); 4813 } else { 4814 R.clear(); 4815 R.setLookupName(Ident); 4816 } 4817 } 4818 4819 if (R.empty()) { 4820 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4821 return 0; 4822 } 4823 } 4824 4825 NamespaceAliasDecl *AliasDecl = 4826 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4827 Alias, SS.getWithLocInContext(Context), 4828 IdentLoc, R.getFoundDecl()); 4829 4830 PushOnScopeChains(AliasDecl, S); 4831 return AliasDecl; 4832} 4833 4834namespace { 4835 /// \brief Scoped object used to handle the state changes required in Sema 4836 /// to implicitly define the body of a C++ member function; 4837 class ImplicitlyDefinedFunctionScope { 4838 Sema &S; 4839 Sema::ContextRAII SavedContext; 4840 4841 public: 4842 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4843 : S(S), SavedContext(S, Method) 4844 { 4845 S.PushFunctionScope(); 4846 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4847 } 4848 4849 ~ImplicitlyDefinedFunctionScope() { 4850 S.PopExpressionEvaluationContext(); 4851 S.PopFunctionOrBlockScope(); 4852 } 4853 }; 4854} 4855 4856static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4857 CXXRecordDecl *D) { 4858 ASTContext &Context = Self.Context; 4859 QualType ClassType = Context.getTypeDeclType(D); 4860 DeclarationName ConstructorName 4861 = Context.DeclarationNames.getCXXConstructorName( 4862 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4863 4864 DeclContext::lookup_const_iterator Con, ConEnd; 4865 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4866 Con != ConEnd; ++Con) { 4867 // FIXME: In C++0x, a constructor template can be a default constructor. 4868 if (isa<FunctionTemplateDecl>(*Con)) 4869 continue; 4870 4871 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4872 if (Constructor->isDefaultConstructor()) 4873 return Constructor; 4874 } 4875 return 0; 4876} 4877 4878CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4879 CXXRecordDecl *ClassDecl) { 4880 // C++ [class.ctor]p5: 4881 // A default constructor for a class X is a constructor of class X 4882 // that can be called without an argument. If there is no 4883 // user-declared constructor for class X, a default constructor is 4884 // implicitly declared. An implicitly-declared default constructor 4885 // is an inline public member of its class. 4886 assert(!ClassDecl->hasUserDeclaredConstructor() && 4887 "Should not build implicit default constructor!"); 4888 4889 // C++ [except.spec]p14: 4890 // An implicitly declared special member function (Clause 12) shall have an 4891 // exception-specification. [...] 4892 ImplicitExceptionSpecification ExceptSpec(Context); 4893 4894 // Direct base-class constructors. 4895 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4896 BEnd = ClassDecl->bases_end(); 4897 B != BEnd; ++B) { 4898 if (B->isVirtual()) // Handled below. 4899 continue; 4900 4901 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4902 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4903 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4904 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4905 else if (CXXConstructorDecl *Constructor 4906 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4907 ExceptSpec.CalledDecl(Constructor); 4908 } 4909 } 4910 4911 // Virtual base-class constructors. 4912 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4913 BEnd = ClassDecl->vbases_end(); 4914 B != BEnd; ++B) { 4915 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4916 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4917 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4918 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4919 else if (CXXConstructorDecl *Constructor 4920 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4921 ExceptSpec.CalledDecl(Constructor); 4922 } 4923 } 4924 4925 // Field constructors. 4926 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4927 FEnd = ClassDecl->field_end(); 4928 F != FEnd; ++F) { 4929 if (const RecordType *RecordTy 4930 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4931 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4932 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4933 ExceptSpec.CalledDecl( 4934 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4935 else if (CXXConstructorDecl *Constructor 4936 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4937 ExceptSpec.CalledDecl(Constructor); 4938 } 4939 } 4940 4941 FunctionProtoType::ExtProtoInfo EPI; 4942 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4943 EPI.NumExceptions = ExceptSpec.size(); 4944 EPI.Exceptions = ExceptSpec.data(); 4945 4946 // Create the actual constructor declaration. 4947 CanQualType ClassType 4948 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4949 SourceLocation ClassLoc = ClassDecl->getLocation(); 4950 DeclarationName Name 4951 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4952 DeclarationNameInfo NameInfo(Name, ClassLoc); 4953 CXXConstructorDecl *DefaultCon 4954 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4955 Context.getFunctionType(Context.VoidTy, 4956 0, 0, EPI), 4957 /*TInfo=*/0, 4958 /*isExplicit=*/false, 4959 /*isInline=*/true, 4960 /*isImplicitlyDeclared=*/true); 4961 DefaultCon->setAccess(AS_public); 4962 DefaultCon->setImplicit(); 4963 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4964 4965 // Note that we have declared this constructor. 4966 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4967 4968 if (Scope *S = getScopeForContext(ClassDecl)) 4969 PushOnScopeChains(DefaultCon, S, false); 4970 ClassDecl->addDecl(DefaultCon); 4971 4972 return DefaultCon; 4973} 4974 4975void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4976 CXXConstructorDecl *Constructor) { 4977 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4978 !Constructor->isUsed(false)) && 4979 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4980 4981 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4982 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4983 4984 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4985 DiagnosticErrorTrap Trap(Diags); 4986 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4987 Trap.hasErrorOccurred()) { 4988 Diag(CurrentLocation, diag::note_member_synthesized_at) 4989 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4990 Constructor->setInvalidDecl(); 4991 return; 4992 } 4993 4994 SourceLocation Loc = Constructor->getLocation(); 4995 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 4996 4997 Constructor->setUsed(); 4998 MarkVTableUsed(CurrentLocation, ClassDecl); 4999 5000 if (ASTMutationListener *L = getASTMutationListener()) { 5001 L->CompletedImplicitDefinition(Constructor); 5002 } 5003} 5004 5005void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5006 // We start with an initial pass over the base classes to collect those that 5007 // inherit constructors from. If there are none, we can forgo all further 5008 // processing. 5009 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5010 BasesVector BasesToInheritFrom; 5011 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5012 BaseE = ClassDecl->bases_end(); 5013 BaseIt != BaseE; ++BaseIt) { 5014 if (BaseIt->getInheritConstructors()) { 5015 QualType Base = BaseIt->getType(); 5016 if (Base->isDependentType()) { 5017 // If we inherit constructors from anything that is dependent, just 5018 // abort processing altogether. We'll get another chance for the 5019 // instantiations. 5020 return; 5021 } 5022 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5023 } 5024 } 5025 if (BasesToInheritFrom.empty()) 5026 return; 5027 5028 // Now collect the constructors that we already have in the current class. 5029 // Those take precedence over inherited constructors. 5030 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5031 // unless there is a user-declared constructor with the same signature in 5032 // the class where the using-declaration appears. 5033 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5034 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5035 CtorE = ClassDecl->ctor_end(); 5036 CtorIt != CtorE; ++CtorIt) { 5037 ExistingConstructors.insert( 5038 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5039 } 5040 5041 Scope *S = getScopeForContext(ClassDecl); 5042 DeclarationName CreatedCtorName = 5043 Context.DeclarationNames.getCXXConstructorName( 5044 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5045 5046 // Now comes the true work. 5047 // First, we keep a map from constructor types to the base that introduced 5048 // them. Needed for finding conflicting constructors. We also keep the 5049 // actually inserted declarations in there, for pretty diagnostics. 5050 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5051 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5052 ConstructorToSourceMap InheritedConstructors; 5053 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5054 BaseE = BasesToInheritFrom.end(); 5055 BaseIt != BaseE; ++BaseIt) { 5056 const RecordType *Base = *BaseIt; 5057 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5058 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5059 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5060 CtorE = BaseDecl->ctor_end(); 5061 CtorIt != CtorE; ++CtorIt) { 5062 // Find the using declaration for inheriting this base's constructors. 5063 DeclarationName Name = 5064 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5065 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5066 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5067 SourceLocation UsingLoc = UD ? UD->getLocation() : 5068 ClassDecl->getLocation(); 5069 5070 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5071 // from the class X named in the using-declaration consists of actual 5072 // constructors and notional constructors that result from the 5073 // transformation of defaulted parameters as follows: 5074 // - all non-template default constructors of X, and 5075 // - for each non-template constructor of X that has at least one 5076 // parameter with a default argument, the set of constructors that 5077 // results from omitting any ellipsis parameter specification and 5078 // successively omitting parameters with a default argument from the 5079 // end of the parameter-type-list. 5080 CXXConstructorDecl *BaseCtor = *CtorIt; 5081 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5082 const FunctionProtoType *BaseCtorType = 5083 BaseCtor->getType()->getAs<FunctionProtoType>(); 5084 5085 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5086 maxParams = BaseCtor->getNumParams(); 5087 params <= maxParams; ++params) { 5088 // Skip default constructors. They're never inherited. 5089 if (params == 0) 5090 continue; 5091 // Skip copy and move constructors for the same reason. 5092 if (CanBeCopyOrMove && params == 1) 5093 continue; 5094 5095 // Build up a function type for this particular constructor. 5096 // FIXME: The working paper does not consider that the exception spec 5097 // for the inheriting constructor might be larger than that of the 5098 // source. This code doesn't yet, either. 5099 const Type *NewCtorType; 5100 if (params == maxParams) 5101 NewCtorType = BaseCtorType; 5102 else { 5103 llvm::SmallVector<QualType, 16> Args; 5104 for (unsigned i = 0; i < params; ++i) { 5105 Args.push_back(BaseCtorType->getArgType(i)); 5106 } 5107 FunctionProtoType::ExtProtoInfo ExtInfo = 5108 BaseCtorType->getExtProtoInfo(); 5109 ExtInfo.Variadic = false; 5110 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5111 Args.data(), params, ExtInfo) 5112 .getTypePtr(); 5113 } 5114 const Type *CanonicalNewCtorType = 5115 Context.getCanonicalType(NewCtorType); 5116 5117 // Now that we have the type, first check if the class already has a 5118 // constructor with this signature. 5119 if (ExistingConstructors.count(CanonicalNewCtorType)) 5120 continue; 5121 5122 // Then we check if we have already declared an inherited constructor 5123 // with this signature. 5124 std::pair<ConstructorToSourceMap::iterator, bool> result = 5125 InheritedConstructors.insert(std::make_pair( 5126 CanonicalNewCtorType, 5127 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5128 if (!result.second) { 5129 // Already in the map. If it came from a different class, that's an 5130 // error. Not if it's from the same. 5131 CanQualType PreviousBase = result.first->second.first; 5132 if (CanonicalBase != PreviousBase) { 5133 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5134 const CXXConstructorDecl *PrevBaseCtor = 5135 PrevCtor->getInheritedConstructor(); 5136 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5137 5138 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5139 Diag(BaseCtor->getLocation(), 5140 diag::note_using_decl_constructor_conflict_current_ctor); 5141 Diag(PrevBaseCtor->getLocation(), 5142 diag::note_using_decl_constructor_conflict_previous_ctor); 5143 Diag(PrevCtor->getLocation(), 5144 diag::note_using_decl_constructor_conflict_previous_using); 5145 } 5146 continue; 5147 } 5148 5149 // OK, we're there, now add the constructor. 5150 // C++0x [class.inhctor]p8: [...] that would be performed by a 5151 // user-writtern inline constructor [...] 5152 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5153 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5154 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5155 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5156 /*ImplicitlyDeclared=*/true); 5157 NewCtor->setAccess(BaseCtor->getAccess()); 5158 5159 // Build up the parameter decls and add them. 5160 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5161 for (unsigned i = 0; i < params; ++i) { 5162 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5163 UsingLoc, UsingLoc, 5164 /*IdentifierInfo=*/0, 5165 BaseCtorType->getArgType(i), 5166 /*TInfo=*/0, SC_None, 5167 SC_None, /*DefaultArg=*/0)); 5168 } 5169 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5170 NewCtor->setInheritedConstructor(BaseCtor); 5171 5172 PushOnScopeChains(NewCtor, S, false); 5173 ClassDecl->addDecl(NewCtor); 5174 result.first->second.second = NewCtor; 5175 } 5176 } 5177 } 5178} 5179 5180CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5181 // C++ [class.dtor]p2: 5182 // If a class has no user-declared destructor, a destructor is 5183 // declared implicitly. An implicitly-declared destructor is an 5184 // inline public member of its class. 5185 5186 // C++ [except.spec]p14: 5187 // An implicitly declared special member function (Clause 12) shall have 5188 // an exception-specification. 5189 ImplicitExceptionSpecification ExceptSpec(Context); 5190 5191 // Direct base-class destructors. 5192 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5193 BEnd = ClassDecl->bases_end(); 5194 B != BEnd; ++B) { 5195 if (B->isVirtual()) // Handled below. 5196 continue; 5197 5198 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5199 ExceptSpec.CalledDecl( 5200 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5201 } 5202 5203 // Virtual base-class destructors. 5204 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5205 BEnd = ClassDecl->vbases_end(); 5206 B != BEnd; ++B) { 5207 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5208 ExceptSpec.CalledDecl( 5209 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5210 } 5211 5212 // Field destructors. 5213 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5214 FEnd = ClassDecl->field_end(); 5215 F != FEnd; ++F) { 5216 if (const RecordType *RecordTy 5217 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5218 ExceptSpec.CalledDecl( 5219 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5220 } 5221 5222 // Create the actual destructor declaration. 5223 FunctionProtoType::ExtProtoInfo EPI; 5224 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5225 EPI.NumExceptions = ExceptSpec.size(); 5226 EPI.Exceptions = ExceptSpec.data(); 5227 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5228 5229 CanQualType ClassType 5230 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5231 SourceLocation ClassLoc = ClassDecl->getLocation(); 5232 DeclarationName Name 5233 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5234 DeclarationNameInfo NameInfo(Name, ClassLoc); 5235 CXXDestructorDecl *Destructor 5236 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5237 /*isInline=*/true, 5238 /*isImplicitlyDeclared=*/true); 5239 Destructor->setAccess(AS_public); 5240 Destructor->setImplicit(); 5241 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5242 5243 // Note that we have declared this destructor. 5244 ++ASTContext::NumImplicitDestructorsDeclared; 5245 5246 // Introduce this destructor into its scope. 5247 if (Scope *S = getScopeForContext(ClassDecl)) 5248 PushOnScopeChains(Destructor, S, false); 5249 ClassDecl->addDecl(Destructor); 5250 5251 // This could be uniqued if it ever proves significant. 5252 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5253 5254 AddOverriddenMethods(ClassDecl, Destructor); 5255 5256 return Destructor; 5257} 5258 5259void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5260 CXXDestructorDecl *Destructor) { 5261 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5262 "DefineImplicitDestructor - call it for implicit default dtor"); 5263 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5264 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5265 5266 if (Destructor->isInvalidDecl()) 5267 return; 5268 5269 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5270 5271 DiagnosticErrorTrap Trap(Diags); 5272 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5273 Destructor->getParent()); 5274 5275 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5276 Diag(CurrentLocation, diag::note_member_synthesized_at) 5277 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5278 5279 Destructor->setInvalidDecl(); 5280 return; 5281 } 5282 5283 SourceLocation Loc = Destructor->getLocation(); 5284 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5285 5286 Destructor->setUsed(); 5287 MarkVTableUsed(CurrentLocation, ClassDecl); 5288 5289 if (ASTMutationListener *L = getASTMutationListener()) { 5290 L->CompletedImplicitDefinition(Destructor); 5291 } 5292} 5293 5294/// \brief Builds a statement that copies the given entity from \p From to 5295/// \c To. 5296/// 5297/// This routine is used to copy the members of a class with an 5298/// implicitly-declared copy assignment operator. When the entities being 5299/// copied are arrays, this routine builds for loops to copy them. 5300/// 5301/// \param S The Sema object used for type-checking. 5302/// 5303/// \param Loc The location where the implicit copy is being generated. 5304/// 5305/// \param T The type of the expressions being copied. Both expressions must 5306/// have this type. 5307/// 5308/// \param To The expression we are copying to. 5309/// 5310/// \param From The expression we are copying from. 5311/// 5312/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5313/// Otherwise, it's a non-static member subobject. 5314/// 5315/// \param Depth Internal parameter recording the depth of the recursion. 5316/// 5317/// \returns A statement or a loop that copies the expressions. 5318static StmtResult 5319BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5320 Expr *To, Expr *From, 5321 bool CopyingBaseSubobject, unsigned Depth = 0) { 5322 // C++0x [class.copy]p30: 5323 // Each subobject is assigned in the manner appropriate to its type: 5324 // 5325 // - if the subobject is of class type, the copy assignment operator 5326 // for the class is used (as if by explicit qualification; that is, 5327 // ignoring any possible virtual overriding functions in more derived 5328 // classes); 5329 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5330 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5331 5332 // Look for operator=. 5333 DeclarationName Name 5334 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5335 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5336 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5337 5338 // Filter out any result that isn't a copy-assignment operator. 5339 LookupResult::Filter F = OpLookup.makeFilter(); 5340 while (F.hasNext()) { 5341 NamedDecl *D = F.next(); 5342 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5343 if (Method->isCopyAssignmentOperator()) 5344 continue; 5345 5346 F.erase(); 5347 } 5348 F.done(); 5349 5350 // Suppress the protected check (C++ [class.protected]) for each of the 5351 // assignment operators we found. This strange dance is required when 5352 // we're assigning via a base classes's copy-assignment operator. To 5353 // ensure that we're getting the right base class subobject (without 5354 // ambiguities), we need to cast "this" to that subobject type; to 5355 // ensure that we don't go through the virtual call mechanism, we need 5356 // to qualify the operator= name with the base class (see below). However, 5357 // this means that if the base class has a protected copy assignment 5358 // operator, the protected member access check will fail. So, we 5359 // rewrite "protected" access to "public" access in this case, since we 5360 // know by construction that we're calling from a derived class. 5361 if (CopyingBaseSubobject) { 5362 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5363 L != LEnd; ++L) { 5364 if (L.getAccess() == AS_protected) 5365 L.setAccess(AS_public); 5366 } 5367 } 5368 5369 // Create the nested-name-specifier that will be used to qualify the 5370 // reference to operator=; this is required to suppress the virtual 5371 // call mechanism. 5372 CXXScopeSpec SS; 5373 SS.MakeTrivial(S.Context, 5374 NestedNameSpecifier::Create(S.Context, 0, false, 5375 T.getTypePtr()), 5376 Loc); 5377 5378 // Create the reference to operator=. 5379 ExprResult OpEqualRef 5380 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5381 /*FirstQualifierInScope=*/0, OpLookup, 5382 /*TemplateArgs=*/0, 5383 /*SuppressQualifierCheck=*/true); 5384 if (OpEqualRef.isInvalid()) 5385 return StmtError(); 5386 5387 // Build the call to the assignment operator. 5388 5389 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5390 OpEqualRef.takeAs<Expr>(), 5391 Loc, &From, 1, Loc); 5392 if (Call.isInvalid()) 5393 return StmtError(); 5394 5395 return S.Owned(Call.takeAs<Stmt>()); 5396 } 5397 5398 // - if the subobject is of scalar type, the built-in assignment 5399 // operator is used. 5400 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5401 if (!ArrayTy) { 5402 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5403 if (Assignment.isInvalid()) 5404 return StmtError(); 5405 5406 return S.Owned(Assignment.takeAs<Stmt>()); 5407 } 5408 5409 // - if the subobject is an array, each element is assigned, in the 5410 // manner appropriate to the element type; 5411 5412 // Construct a loop over the array bounds, e.g., 5413 // 5414 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5415 // 5416 // that will copy each of the array elements. 5417 QualType SizeType = S.Context.getSizeType(); 5418 5419 // Create the iteration variable. 5420 IdentifierInfo *IterationVarName = 0; 5421 { 5422 llvm::SmallString<8> Str; 5423 llvm::raw_svector_ostream OS(Str); 5424 OS << "__i" << Depth; 5425 IterationVarName = &S.Context.Idents.get(OS.str()); 5426 } 5427 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5428 IterationVarName, SizeType, 5429 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5430 SC_None, SC_None); 5431 5432 // Initialize the iteration variable to zero. 5433 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5434 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5435 5436 // Create a reference to the iteration variable; we'll use this several 5437 // times throughout. 5438 Expr *IterationVarRef 5439 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5440 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5441 5442 // Create the DeclStmt that holds the iteration variable. 5443 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5444 5445 // Create the comparison against the array bound. 5446 llvm::APInt Upper 5447 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5448 Expr *Comparison 5449 = new (S.Context) BinaryOperator(IterationVarRef, 5450 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5451 BO_NE, S.Context.BoolTy, 5452 VK_RValue, OK_Ordinary, Loc); 5453 5454 // Create the pre-increment of the iteration variable. 5455 Expr *Increment 5456 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5457 VK_LValue, OK_Ordinary, Loc); 5458 5459 // Subscript the "from" and "to" expressions with the iteration variable. 5460 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5461 IterationVarRef, Loc)); 5462 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5463 IterationVarRef, Loc)); 5464 5465 // Build the copy for an individual element of the array. 5466 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5467 To, From, CopyingBaseSubobject, 5468 Depth + 1); 5469 if (Copy.isInvalid()) 5470 return StmtError(); 5471 5472 // Construct the loop that copies all elements of this array. 5473 return S.ActOnForStmt(Loc, Loc, InitStmt, 5474 S.MakeFullExpr(Comparison), 5475 0, S.MakeFullExpr(Increment), 5476 Loc, Copy.take()); 5477} 5478 5479/// \brief Determine whether the given class has a copy assignment operator 5480/// that accepts a const-qualified argument. 5481static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5482 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5483 5484 if (!Class->hasDeclaredCopyAssignment()) 5485 S.DeclareImplicitCopyAssignment(Class); 5486 5487 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5488 DeclarationName OpName 5489 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5490 5491 DeclContext::lookup_const_iterator Op, OpEnd; 5492 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5493 // C++ [class.copy]p9: 5494 // A user-declared copy assignment operator is a non-static non-template 5495 // member function of class X with exactly one parameter of type X, X&, 5496 // const X&, volatile X& or const volatile X&. 5497 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5498 if (!Method) 5499 continue; 5500 5501 if (Method->isStatic()) 5502 continue; 5503 if (Method->getPrimaryTemplate()) 5504 continue; 5505 const FunctionProtoType *FnType = 5506 Method->getType()->getAs<FunctionProtoType>(); 5507 assert(FnType && "Overloaded operator has no prototype."); 5508 // Don't assert on this; an invalid decl might have been left in the AST. 5509 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5510 continue; 5511 bool AcceptsConst = true; 5512 QualType ArgType = FnType->getArgType(0); 5513 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5514 ArgType = Ref->getPointeeType(); 5515 // Is it a non-const lvalue reference? 5516 if (!ArgType.isConstQualified()) 5517 AcceptsConst = false; 5518 } 5519 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5520 continue; 5521 5522 // We have a single argument of type cv X or cv X&, i.e. we've found the 5523 // copy assignment operator. Return whether it accepts const arguments. 5524 return AcceptsConst; 5525 } 5526 assert(Class->isInvalidDecl() && 5527 "No copy assignment operator declared in valid code."); 5528 return false; 5529} 5530 5531CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5532 // Note: The following rules are largely analoguous to the copy 5533 // constructor rules. Note that virtual bases are not taken into account 5534 // for determining the argument type of the operator. Note also that 5535 // operators taking an object instead of a reference are allowed. 5536 5537 5538 // C++ [class.copy]p10: 5539 // If the class definition does not explicitly declare a copy 5540 // assignment operator, one is declared implicitly. 5541 // The implicitly-defined copy assignment operator for a class X 5542 // will have the form 5543 // 5544 // X& X::operator=(const X&) 5545 // 5546 // if 5547 bool HasConstCopyAssignment = true; 5548 5549 // -- each direct base class B of X has a copy assignment operator 5550 // whose parameter is of type const B&, const volatile B& or B, 5551 // and 5552 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5553 BaseEnd = ClassDecl->bases_end(); 5554 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5555 assert(!Base->getType()->isDependentType() && 5556 "Cannot generate implicit members for class with dependent bases."); 5557 const CXXRecordDecl *BaseClassDecl 5558 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5559 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5560 } 5561 5562 // -- for all the nonstatic data members of X that are of a class 5563 // type M (or array thereof), each such class type has a copy 5564 // assignment operator whose parameter is of type const M&, 5565 // const volatile M& or M. 5566 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5567 FieldEnd = ClassDecl->field_end(); 5568 HasConstCopyAssignment && Field != FieldEnd; 5569 ++Field) { 5570 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5571 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5572 const CXXRecordDecl *FieldClassDecl 5573 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5574 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5575 } 5576 } 5577 5578 // Otherwise, the implicitly declared copy assignment operator will 5579 // have the form 5580 // 5581 // X& X::operator=(X&) 5582 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5583 QualType RetType = Context.getLValueReferenceType(ArgType); 5584 if (HasConstCopyAssignment) 5585 ArgType = ArgType.withConst(); 5586 ArgType = Context.getLValueReferenceType(ArgType); 5587 5588 // C++ [except.spec]p14: 5589 // An implicitly declared special member function (Clause 12) shall have an 5590 // exception-specification. [...] 5591 ImplicitExceptionSpecification ExceptSpec(Context); 5592 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5593 BaseEnd = ClassDecl->bases_end(); 5594 Base != BaseEnd; ++Base) { 5595 CXXRecordDecl *BaseClassDecl 5596 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5597 5598 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5599 DeclareImplicitCopyAssignment(BaseClassDecl); 5600 5601 if (CXXMethodDecl *CopyAssign 5602 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5603 ExceptSpec.CalledDecl(CopyAssign); 5604 } 5605 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5606 FieldEnd = ClassDecl->field_end(); 5607 Field != FieldEnd; 5608 ++Field) { 5609 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5610 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5611 CXXRecordDecl *FieldClassDecl 5612 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5613 5614 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5615 DeclareImplicitCopyAssignment(FieldClassDecl); 5616 5617 if (CXXMethodDecl *CopyAssign 5618 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5619 ExceptSpec.CalledDecl(CopyAssign); 5620 } 5621 } 5622 5623 // An implicitly-declared copy assignment operator is an inline public 5624 // member of its class. 5625 FunctionProtoType::ExtProtoInfo EPI; 5626 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5627 EPI.NumExceptions = ExceptSpec.size(); 5628 EPI.Exceptions = ExceptSpec.data(); 5629 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5630 SourceLocation ClassLoc = ClassDecl->getLocation(); 5631 DeclarationNameInfo NameInfo(Name, ClassLoc); 5632 CXXMethodDecl *CopyAssignment 5633 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5634 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5635 /*TInfo=*/0, /*isStatic=*/false, 5636 /*StorageClassAsWritten=*/SC_None, 5637 /*isInline=*/true, 5638 SourceLocation()); 5639 CopyAssignment->setAccess(AS_public); 5640 CopyAssignment->setImplicit(); 5641 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5642 5643 // Add the parameter to the operator. 5644 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5645 ClassLoc, ClassLoc, /*Id=*/0, 5646 ArgType, /*TInfo=*/0, 5647 SC_None, 5648 SC_None, 0); 5649 CopyAssignment->setParams(&FromParam, 1); 5650 5651 // Note that we have added this copy-assignment operator. 5652 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5653 5654 if (Scope *S = getScopeForContext(ClassDecl)) 5655 PushOnScopeChains(CopyAssignment, S, false); 5656 ClassDecl->addDecl(CopyAssignment); 5657 5658 AddOverriddenMethods(ClassDecl, CopyAssignment); 5659 return CopyAssignment; 5660} 5661 5662void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5663 CXXMethodDecl *CopyAssignOperator) { 5664 assert((CopyAssignOperator->isImplicit() && 5665 CopyAssignOperator->isOverloadedOperator() && 5666 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5667 !CopyAssignOperator->isUsed(false)) && 5668 "DefineImplicitCopyAssignment called for wrong function"); 5669 5670 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5671 5672 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5673 CopyAssignOperator->setInvalidDecl(); 5674 return; 5675 } 5676 5677 CopyAssignOperator->setUsed(); 5678 5679 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5680 DiagnosticErrorTrap Trap(Diags); 5681 5682 // C++0x [class.copy]p30: 5683 // The implicitly-defined or explicitly-defaulted copy assignment operator 5684 // for a non-union class X performs memberwise copy assignment of its 5685 // subobjects. The direct base classes of X are assigned first, in the 5686 // order of their declaration in the base-specifier-list, and then the 5687 // immediate non-static data members of X are assigned, in the order in 5688 // which they were declared in the class definition. 5689 5690 // The statements that form the synthesized function body. 5691 ASTOwningVector<Stmt*> Statements(*this); 5692 5693 // The parameter for the "other" object, which we are copying from. 5694 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5695 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5696 QualType OtherRefType = Other->getType(); 5697 if (const LValueReferenceType *OtherRef 5698 = OtherRefType->getAs<LValueReferenceType>()) { 5699 OtherRefType = OtherRef->getPointeeType(); 5700 OtherQuals = OtherRefType.getQualifiers(); 5701 } 5702 5703 // Our location for everything implicitly-generated. 5704 SourceLocation Loc = CopyAssignOperator->getLocation(); 5705 5706 // Construct a reference to the "other" object. We'll be using this 5707 // throughout the generated ASTs. 5708 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5709 assert(OtherRef && "Reference to parameter cannot fail!"); 5710 5711 // Construct the "this" pointer. We'll be using this throughout the generated 5712 // ASTs. 5713 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5714 assert(This && "Reference to this cannot fail!"); 5715 5716 // Assign base classes. 5717 bool Invalid = false; 5718 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5719 E = ClassDecl->bases_end(); Base != E; ++Base) { 5720 // Form the assignment: 5721 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5722 QualType BaseType = Base->getType().getUnqualifiedType(); 5723 if (!BaseType->isRecordType()) { 5724 Invalid = true; 5725 continue; 5726 } 5727 5728 CXXCastPath BasePath; 5729 BasePath.push_back(Base); 5730 5731 // Construct the "from" expression, which is an implicit cast to the 5732 // appropriately-qualified base type. 5733 Expr *From = OtherRef; 5734 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5735 CK_UncheckedDerivedToBase, 5736 VK_LValue, &BasePath).take(); 5737 5738 // Dereference "this". 5739 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5740 5741 // Implicitly cast "this" to the appropriately-qualified base type. 5742 To = ImpCastExprToType(To.take(), 5743 Context.getCVRQualifiedType(BaseType, 5744 CopyAssignOperator->getTypeQualifiers()), 5745 CK_UncheckedDerivedToBase, 5746 VK_LValue, &BasePath); 5747 5748 // Build the copy. 5749 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5750 To.get(), From, 5751 /*CopyingBaseSubobject=*/true); 5752 if (Copy.isInvalid()) { 5753 Diag(CurrentLocation, diag::note_member_synthesized_at) 5754 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5755 CopyAssignOperator->setInvalidDecl(); 5756 return; 5757 } 5758 5759 // Success! Record the copy. 5760 Statements.push_back(Copy.takeAs<Expr>()); 5761 } 5762 5763 // \brief Reference to the __builtin_memcpy function. 5764 Expr *BuiltinMemCpyRef = 0; 5765 // \brief Reference to the __builtin_objc_memmove_collectable function. 5766 Expr *CollectableMemCpyRef = 0; 5767 5768 // Assign non-static members. 5769 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5770 FieldEnd = ClassDecl->field_end(); 5771 Field != FieldEnd; ++Field) { 5772 // Check for members of reference type; we can't copy those. 5773 if (Field->getType()->isReferenceType()) { 5774 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5775 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5776 Diag(Field->getLocation(), diag::note_declared_at); 5777 Diag(CurrentLocation, diag::note_member_synthesized_at) 5778 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5779 Invalid = true; 5780 continue; 5781 } 5782 5783 // Check for members of const-qualified, non-class type. 5784 QualType BaseType = Context.getBaseElementType(Field->getType()); 5785 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5786 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5787 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5788 Diag(Field->getLocation(), diag::note_declared_at); 5789 Diag(CurrentLocation, diag::note_member_synthesized_at) 5790 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5791 Invalid = true; 5792 continue; 5793 } 5794 5795 QualType FieldType = Field->getType().getNonReferenceType(); 5796 if (FieldType->isIncompleteArrayType()) { 5797 assert(ClassDecl->hasFlexibleArrayMember() && 5798 "Incomplete array type is not valid"); 5799 continue; 5800 } 5801 5802 // Build references to the field in the object we're copying from and to. 5803 CXXScopeSpec SS; // Intentionally empty 5804 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5805 LookupMemberName); 5806 MemberLookup.addDecl(*Field); 5807 MemberLookup.resolveKind(); 5808 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5809 Loc, /*IsArrow=*/false, 5810 SS, 0, MemberLookup, 0); 5811 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5812 Loc, /*IsArrow=*/true, 5813 SS, 0, MemberLookup, 0); 5814 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5815 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5816 5817 // If the field should be copied with __builtin_memcpy rather than via 5818 // explicit assignments, do so. This optimization only applies for arrays 5819 // of scalars and arrays of class type with trivial copy-assignment 5820 // operators. 5821 if (FieldType->isArrayType() && 5822 (!BaseType->isRecordType() || 5823 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5824 ->hasTrivialCopyAssignment())) { 5825 // Compute the size of the memory buffer to be copied. 5826 QualType SizeType = Context.getSizeType(); 5827 llvm::APInt Size(Context.getTypeSize(SizeType), 5828 Context.getTypeSizeInChars(BaseType).getQuantity()); 5829 for (const ConstantArrayType *Array 5830 = Context.getAsConstantArrayType(FieldType); 5831 Array; 5832 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5833 llvm::APInt ArraySize 5834 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5835 Size *= ArraySize; 5836 } 5837 5838 // Take the address of the field references for "from" and "to". 5839 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5840 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5841 5842 bool NeedsCollectableMemCpy = 5843 (BaseType->isRecordType() && 5844 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5845 5846 if (NeedsCollectableMemCpy) { 5847 if (!CollectableMemCpyRef) { 5848 // Create a reference to the __builtin_objc_memmove_collectable function. 5849 LookupResult R(*this, 5850 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5851 Loc, LookupOrdinaryName); 5852 LookupName(R, TUScope, true); 5853 5854 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5855 if (!CollectableMemCpy) { 5856 // Something went horribly wrong earlier, and we will have 5857 // complained about it. 5858 Invalid = true; 5859 continue; 5860 } 5861 5862 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5863 CollectableMemCpy->getType(), 5864 VK_LValue, Loc, 0).take(); 5865 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5866 } 5867 } 5868 // Create a reference to the __builtin_memcpy builtin function. 5869 else if (!BuiltinMemCpyRef) { 5870 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5871 LookupOrdinaryName); 5872 LookupName(R, TUScope, true); 5873 5874 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5875 if (!BuiltinMemCpy) { 5876 // Something went horribly wrong earlier, and we will have complained 5877 // about it. 5878 Invalid = true; 5879 continue; 5880 } 5881 5882 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5883 BuiltinMemCpy->getType(), 5884 VK_LValue, Loc, 0).take(); 5885 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5886 } 5887 5888 ASTOwningVector<Expr*> CallArgs(*this); 5889 CallArgs.push_back(To.takeAs<Expr>()); 5890 CallArgs.push_back(From.takeAs<Expr>()); 5891 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5892 ExprResult Call = ExprError(); 5893 if (NeedsCollectableMemCpy) 5894 Call = ActOnCallExpr(/*Scope=*/0, 5895 CollectableMemCpyRef, 5896 Loc, move_arg(CallArgs), 5897 Loc); 5898 else 5899 Call = ActOnCallExpr(/*Scope=*/0, 5900 BuiltinMemCpyRef, 5901 Loc, move_arg(CallArgs), 5902 Loc); 5903 5904 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5905 Statements.push_back(Call.takeAs<Expr>()); 5906 continue; 5907 } 5908 5909 // Build the copy of this field. 5910 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5911 To.get(), From.get(), 5912 /*CopyingBaseSubobject=*/false); 5913 if (Copy.isInvalid()) { 5914 Diag(CurrentLocation, diag::note_member_synthesized_at) 5915 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5916 CopyAssignOperator->setInvalidDecl(); 5917 return; 5918 } 5919 5920 // Success! Record the copy. 5921 Statements.push_back(Copy.takeAs<Stmt>()); 5922 } 5923 5924 if (!Invalid) { 5925 // Add a "return *this;" 5926 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5927 5928 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5929 if (Return.isInvalid()) 5930 Invalid = true; 5931 else { 5932 Statements.push_back(Return.takeAs<Stmt>()); 5933 5934 if (Trap.hasErrorOccurred()) { 5935 Diag(CurrentLocation, diag::note_member_synthesized_at) 5936 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5937 Invalid = true; 5938 } 5939 } 5940 } 5941 5942 if (Invalid) { 5943 CopyAssignOperator->setInvalidDecl(); 5944 return; 5945 } 5946 5947 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5948 /*isStmtExpr=*/false); 5949 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5950 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5951 5952 if (ASTMutationListener *L = getASTMutationListener()) { 5953 L->CompletedImplicitDefinition(CopyAssignOperator); 5954 } 5955} 5956 5957CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5958 CXXRecordDecl *ClassDecl) { 5959 // C++ [class.copy]p4: 5960 // If the class definition does not explicitly declare a copy 5961 // constructor, one is declared implicitly. 5962 5963 // C++ [class.copy]p5: 5964 // The implicitly-declared copy constructor for a class X will 5965 // have the form 5966 // 5967 // X::X(const X&) 5968 // 5969 // if 5970 bool HasConstCopyConstructor = true; 5971 5972 // -- each direct or virtual base class B of X has a copy 5973 // constructor whose first parameter is of type const B& or 5974 // const volatile B&, and 5975 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5976 BaseEnd = ClassDecl->bases_end(); 5977 HasConstCopyConstructor && Base != BaseEnd; 5978 ++Base) { 5979 // Virtual bases are handled below. 5980 if (Base->isVirtual()) 5981 continue; 5982 5983 CXXRecordDecl *BaseClassDecl 5984 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5985 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5986 DeclareImplicitCopyConstructor(BaseClassDecl); 5987 5988 HasConstCopyConstructor 5989 = BaseClassDecl->hasConstCopyConstructor(Context); 5990 } 5991 5992 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5993 BaseEnd = ClassDecl->vbases_end(); 5994 HasConstCopyConstructor && Base != BaseEnd; 5995 ++Base) { 5996 CXXRecordDecl *BaseClassDecl 5997 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5998 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5999 DeclareImplicitCopyConstructor(BaseClassDecl); 6000 6001 HasConstCopyConstructor 6002 = BaseClassDecl->hasConstCopyConstructor(Context); 6003 } 6004 6005 // -- for all the nonstatic data members of X that are of a 6006 // class type M (or array thereof), each such class type 6007 // has a copy constructor whose first parameter is of type 6008 // const M& or const volatile M&. 6009 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6010 FieldEnd = ClassDecl->field_end(); 6011 HasConstCopyConstructor && Field != FieldEnd; 6012 ++Field) { 6013 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6014 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6015 CXXRecordDecl *FieldClassDecl 6016 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6017 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6018 DeclareImplicitCopyConstructor(FieldClassDecl); 6019 6020 HasConstCopyConstructor 6021 = FieldClassDecl->hasConstCopyConstructor(Context); 6022 } 6023 } 6024 6025 // Otherwise, the implicitly declared copy constructor will have 6026 // the form 6027 // 6028 // X::X(X&) 6029 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6030 QualType ArgType = ClassType; 6031 if (HasConstCopyConstructor) 6032 ArgType = ArgType.withConst(); 6033 ArgType = Context.getLValueReferenceType(ArgType); 6034 6035 // C++ [except.spec]p14: 6036 // An implicitly declared special member function (Clause 12) shall have an 6037 // exception-specification. [...] 6038 ImplicitExceptionSpecification ExceptSpec(Context); 6039 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6040 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6041 BaseEnd = ClassDecl->bases_end(); 6042 Base != BaseEnd; 6043 ++Base) { 6044 // Virtual bases are handled below. 6045 if (Base->isVirtual()) 6046 continue; 6047 6048 CXXRecordDecl *BaseClassDecl 6049 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6050 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6051 DeclareImplicitCopyConstructor(BaseClassDecl); 6052 6053 if (CXXConstructorDecl *CopyConstructor 6054 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6055 ExceptSpec.CalledDecl(CopyConstructor); 6056 } 6057 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6058 BaseEnd = ClassDecl->vbases_end(); 6059 Base != BaseEnd; 6060 ++Base) { 6061 CXXRecordDecl *BaseClassDecl 6062 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6063 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6064 DeclareImplicitCopyConstructor(BaseClassDecl); 6065 6066 if (CXXConstructorDecl *CopyConstructor 6067 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6068 ExceptSpec.CalledDecl(CopyConstructor); 6069 } 6070 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6071 FieldEnd = ClassDecl->field_end(); 6072 Field != FieldEnd; 6073 ++Field) { 6074 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6075 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6076 CXXRecordDecl *FieldClassDecl 6077 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6078 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6079 DeclareImplicitCopyConstructor(FieldClassDecl); 6080 6081 if (CXXConstructorDecl *CopyConstructor 6082 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6083 ExceptSpec.CalledDecl(CopyConstructor); 6084 } 6085 } 6086 6087 // An implicitly-declared copy constructor is an inline public 6088 // member of its class. 6089 FunctionProtoType::ExtProtoInfo EPI; 6090 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6091 EPI.NumExceptions = ExceptSpec.size(); 6092 EPI.Exceptions = ExceptSpec.data(); 6093 DeclarationName Name 6094 = Context.DeclarationNames.getCXXConstructorName( 6095 Context.getCanonicalType(ClassType)); 6096 SourceLocation ClassLoc = ClassDecl->getLocation(); 6097 DeclarationNameInfo NameInfo(Name, ClassLoc); 6098 CXXConstructorDecl *CopyConstructor 6099 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6100 Context.getFunctionType(Context.VoidTy, 6101 &ArgType, 1, EPI), 6102 /*TInfo=*/0, 6103 /*isExplicit=*/false, 6104 /*isInline=*/true, 6105 /*isImplicitlyDeclared=*/true); 6106 CopyConstructor->setAccess(AS_public); 6107 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6108 6109 // Note that we have declared this constructor. 6110 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6111 6112 // Add the parameter to the constructor. 6113 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6114 ClassLoc, ClassLoc, 6115 /*IdentifierInfo=*/0, 6116 ArgType, /*TInfo=*/0, 6117 SC_None, 6118 SC_None, 0); 6119 CopyConstructor->setParams(&FromParam, 1); 6120 if (Scope *S = getScopeForContext(ClassDecl)) 6121 PushOnScopeChains(CopyConstructor, S, false); 6122 ClassDecl->addDecl(CopyConstructor); 6123 6124 return CopyConstructor; 6125} 6126 6127void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6128 CXXConstructorDecl *CopyConstructor, 6129 unsigned TypeQuals) { 6130 assert((CopyConstructor->isImplicit() && 6131 CopyConstructor->isCopyConstructor(TypeQuals) && 6132 !CopyConstructor->isUsed(false)) && 6133 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6134 6135 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6136 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6137 6138 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6139 DiagnosticErrorTrap Trap(Diags); 6140 6141 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6142 Trap.hasErrorOccurred()) { 6143 Diag(CurrentLocation, diag::note_member_synthesized_at) 6144 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6145 CopyConstructor->setInvalidDecl(); 6146 } else { 6147 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6148 CopyConstructor->getLocation(), 6149 MultiStmtArg(*this, 0, 0), 6150 /*isStmtExpr=*/false) 6151 .takeAs<Stmt>()); 6152 } 6153 6154 CopyConstructor->setUsed(); 6155 6156 if (ASTMutationListener *L = getASTMutationListener()) { 6157 L->CompletedImplicitDefinition(CopyConstructor); 6158 } 6159} 6160 6161ExprResult 6162Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6163 CXXConstructorDecl *Constructor, 6164 MultiExprArg ExprArgs, 6165 bool RequiresZeroInit, 6166 unsigned ConstructKind, 6167 SourceRange ParenRange) { 6168 bool Elidable = false; 6169 6170 // C++0x [class.copy]p34: 6171 // When certain criteria are met, an implementation is allowed to 6172 // omit the copy/move construction of a class object, even if the 6173 // copy/move constructor and/or destructor for the object have 6174 // side effects. [...] 6175 // - when a temporary class object that has not been bound to a 6176 // reference (12.2) would be copied/moved to a class object 6177 // with the same cv-unqualified type, the copy/move operation 6178 // can be omitted by constructing the temporary object 6179 // directly into the target of the omitted copy/move 6180 if (ConstructKind == CXXConstructExpr::CK_Complete && 6181 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6182 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6183 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6184 } 6185 6186 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6187 Elidable, move(ExprArgs), RequiresZeroInit, 6188 ConstructKind, ParenRange); 6189} 6190 6191/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6192/// including handling of its default argument expressions. 6193ExprResult 6194Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6195 CXXConstructorDecl *Constructor, bool Elidable, 6196 MultiExprArg ExprArgs, 6197 bool RequiresZeroInit, 6198 unsigned ConstructKind, 6199 SourceRange ParenRange) { 6200 unsigned NumExprs = ExprArgs.size(); 6201 Expr **Exprs = (Expr **)ExprArgs.release(); 6202 6203 for (specific_attr_iterator<NonNullAttr> 6204 i = Constructor->specific_attr_begin<NonNullAttr>(), 6205 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6206 const NonNullAttr *NonNull = *i; 6207 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6208 } 6209 6210 MarkDeclarationReferenced(ConstructLoc, Constructor); 6211 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6212 Constructor, Elidable, Exprs, NumExprs, 6213 RequiresZeroInit, 6214 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6215 ParenRange)); 6216} 6217 6218bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6219 CXXConstructorDecl *Constructor, 6220 MultiExprArg Exprs) { 6221 // FIXME: Provide the correct paren SourceRange when available. 6222 ExprResult TempResult = 6223 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6224 move(Exprs), false, CXXConstructExpr::CK_Complete, 6225 SourceRange()); 6226 if (TempResult.isInvalid()) 6227 return true; 6228 6229 Expr *Temp = TempResult.takeAs<Expr>(); 6230 CheckImplicitConversions(Temp, VD->getLocation()); 6231 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6232 Temp = MaybeCreateExprWithCleanups(Temp); 6233 VD->setInit(Temp); 6234 6235 return false; 6236} 6237 6238void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6239 if (VD->isInvalidDecl()) return; 6240 6241 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6242 if (ClassDecl->isInvalidDecl()) return; 6243 if (ClassDecl->hasTrivialDestructor()) return; 6244 if (ClassDecl->isDependentContext()) return; 6245 6246 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6247 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6248 CheckDestructorAccess(VD->getLocation(), Destructor, 6249 PDiag(diag::err_access_dtor_var) 6250 << VD->getDeclName() 6251 << VD->getType()); 6252 6253 if (!VD->hasGlobalStorage()) return; 6254 6255 // Emit warning for non-trivial dtor in global scope (a real global, 6256 // class-static, function-static). 6257 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6258 6259 // TODO: this should be re-enabled for static locals by !CXAAtExit 6260 if (!VD->isStaticLocal()) 6261 Diag(VD->getLocation(), diag::warn_global_destructor); 6262} 6263 6264/// AddCXXDirectInitializerToDecl - This action is called immediately after 6265/// ActOnDeclarator, when a C++ direct initializer is present. 6266/// e.g: "int x(1);" 6267void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6268 SourceLocation LParenLoc, 6269 MultiExprArg Exprs, 6270 SourceLocation RParenLoc, 6271 bool TypeMayContainAuto) { 6272 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6273 6274 // If there is no declaration, there was an error parsing it. Just ignore 6275 // the initializer. 6276 if (RealDecl == 0) 6277 return; 6278 6279 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6280 if (!VDecl) { 6281 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6282 RealDecl->setInvalidDecl(); 6283 return; 6284 } 6285 6286 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6287 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6288 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6289 if (Exprs.size() > 1) { 6290 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6291 diag::err_auto_var_init_multiple_expressions) 6292 << VDecl->getDeclName() << VDecl->getType() 6293 << VDecl->getSourceRange(); 6294 RealDecl->setInvalidDecl(); 6295 return; 6296 } 6297 6298 Expr *Init = Exprs.get()[0]; 6299 TypeSourceInfo *DeducedType = 0; 6300 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6301 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6302 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6303 << Init->getSourceRange(); 6304 if (!DeducedType) { 6305 RealDecl->setInvalidDecl(); 6306 return; 6307 } 6308 VDecl->setTypeSourceInfo(DeducedType); 6309 VDecl->setType(DeducedType->getType()); 6310 6311 // If this is a redeclaration, check that the type we just deduced matches 6312 // the previously declared type. 6313 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6314 MergeVarDeclTypes(VDecl, Old); 6315 } 6316 6317 // We will represent direct-initialization similarly to copy-initialization: 6318 // int x(1); -as-> int x = 1; 6319 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6320 // 6321 // Clients that want to distinguish between the two forms, can check for 6322 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6323 // A major benefit is that clients that don't particularly care about which 6324 // exactly form was it (like the CodeGen) can handle both cases without 6325 // special case code. 6326 6327 // C++ 8.5p11: 6328 // The form of initialization (using parentheses or '=') is generally 6329 // insignificant, but does matter when the entity being initialized has a 6330 // class type. 6331 6332 if (!VDecl->getType()->isDependentType() && 6333 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6334 diag::err_typecheck_decl_incomplete_type)) { 6335 VDecl->setInvalidDecl(); 6336 return; 6337 } 6338 6339 // The variable can not have an abstract class type. 6340 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6341 diag::err_abstract_type_in_decl, 6342 AbstractVariableType)) 6343 VDecl->setInvalidDecl(); 6344 6345 const VarDecl *Def; 6346 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6347 Diag(VDecl->getLocation(), diag::err_redefinition) 6348 << VDecl->getDeclName(); 6349 Diag(Def->getLocation(), diag::note_previous_definition); 6350 VDecl->setInvalidDecl(); 6351 return; 6352 } 6353 6354 // C++ [class.static.data]p4 6355 // If a static data member is of const integral or const 6356 // enumeration type, its declaration in the class definition can 6357 // specify a constant-initializer which shall be an integral 6358 // constant expression (5.19). In that case, the member can appear 6359 // in integral constant expressions. The member shall still be 6360 // defined in a namespace scope if it is used in the program and the 6361 // namespace scope definition shall not contain an initializer. 6362 // 6363 // We already performed a redefinition check above, but for static 6364 // data members we also need to check whether there was an in-class 6365 // declaration with an initializer. 6366 const VarDecl* PrevInit = 0; 6367 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6368 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6369 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6370 return; 6371 } 6372 6373 bool IsDependent = false; 6374 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6375 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6376 VDecl->setInvalidDecl(); 6377 return; 6378 } 6379 6380 if (Exprs.get()[I]->isTypeDependent()) 6381 IsDependent = true; 6382 } 6383 6384 // If either the declaration has a dependent type or if any of the 6385 // expressions is type-dependent, we represent the initialization 6386 // via a ParenListExpr for later use during template instantiation. 6387 if (VDecl->getType()->isDependentType() || IsDependent) { 6388 // Let clients know that initialization was done with a direct initializer. 6389 VDecl->setCXXDirectInitializer(true); 6390 6391 // Store the initialization expressions as a ParenListExpr. 6392 unsigned NumExprs = Exprs.size(); 6393 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6394 (Expr **)Exprs.release(), 6395 NumExprs, RParenLoc)); 6396 return; 6397 } 6398 6399 // Capture the variable that is being initialized and the style of 6400 // initialization. 6401 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6402 6403 // FIXME: Poor source location information. 6404 InitializationKind Kind 6405 = InitializationKind::CreateDirect(VDecl->getLocation(), 6406 LParenLoc, RParenLoc); 6407 6408 InitializationSequence InitSeq(*this, Entity, Kind, 6409 Exprs.get(), Exprs.size()); 6410 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6411 if (Result.isInvalid()) { 6412 VDecl->setInvalidDecl(); 6413 return; 6414 } 6415 6416 CheckImplicitConversions(Result.get(), LParenLoc); 6417 6418 Result = MaybeCreateExprWithCleanups(Result); 6419 VDecl->setInit(Result.takeAs<Expr>()); 6420 VDecl->setCXXDirectInitializer(true); 6421 6422 CheckCompleteVariableDeclaration(VDecl); 6423} 6424 6425/// \brief Given a constructor and the set of arguments provided for the 6426/// constructor, convert the arguments and add any required default arguments 6427/// to form a proper call to this constructor. 6428/// 6429/// \returns true if an error occurred, false otherwise. 6430bool 6431Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6432 MultiExprArg ArgsPtr, 6433 SourceLocation Loc, 6434 ASTOwningVector<Expr*> &ConvertedArgs) { 6435 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6436 unsigned NumArgs = ArgsPtr.size(); 6437 Expr **Args = (Expr **)ArgsPtr.get(); 6438 6439 const FunctionProtoType *Proto 6440 = Constructor->getType()->getAs<FunctionProtoType>(); 6441 assert(Proto && "Constructor without a prototype?"); 6442 unsigned NumArgsInProto = Proto->getNumArgs(); 6443 6444 // If too few arguments are available, we'll fill in the rest with defaults. 6445 if (NumArgs < NumArgsInProto) 6446 ConvertedArgs.reserve(NumArgsInProto); 6447 else 6448 ConvertedArgs.reserve(NumArgs); 6449 6450 VariadicCallType CallType = 6451 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6452 llvm::SmallVector<Expr *, 8> AllArgs; 6453 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6454 Proto, 0, Args, NumArgs, AllArgs, 6455 CallType); 6456 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6457 ConvertedArgs.push_back(AllArgs[i]); 6458 return Invalid; 6459} 6460 6461static inline bool 6462CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6463 const FunctionDecl *FnDecl) { 6464 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6465 if (isa<NamespaceDecl>(DC)) { 6466 return SemaRef.Diag(FnDecl->getLocation(), 6467 diag::err_operator_new_delete_declared_in_namespace) 6468 << FnDecl->getDeclName(); 6469 } 6470 6471 if (isa<TranslationUnitDecl>(DC) && 6472 FnDecl->getStorageClass() == SC_Static) { 6473 return SemaRef.Diag(FnDecl->getLocation(), 6474 diag::err_operator_new_delete_declared_static) 6475 << FnDecl->getDeclName(); 6476 } 6477 6478 return false; 6479} 6480 6481static inline bool 6482CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6483 CanQualType ExpectedResultType, 6484 CanQualType ExpectedFirstParamType, 6485 unsigned DependentParamTypeDiag, 6486 unsigned InvalidParamTypeDiag) { 6487 QualType ResultType = 6488 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6489 6490 // Check that the result type is not dependent. 6491 if (ResultType->isDependentType()) 6492 return SemaRef.Diag(FnDecl->getLocation(), 6493 diag::err_operator_new_delete_dependent_result_type) 6494 << FnDecl->getDeclName() << ExpectedResultType; 6495 6496 // Check that the result type is what we expect. 6497 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6498 return SemaRef.Diag(FnDecl->getLocation(), 6499 diag::err_operator_new_delete_invalid_result_type) 6500 << FnDecl->getDeclName() << ExpectedResultType; 6501 6502 // A function template must have at least 2 parameters. 6503 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6504 return SemaRef.Diag(FnDecl->getLocation(), 6505 diag::err_operator_new_delete_template_too_few_parameters) 6506 << FnDecl->getDeclName(); 6507 6508 // The function decl must have at least 1 parameter. 6509 if (FnDecl->getNumParams() == 0) 6510 return SemaRef.Diag(FnDecl->getLocation(), 6511 diag::err_operator_new_delete_too_few_parameters) 6512 << FnDecl->getDeclName(); 6513 6514 // Check the the first parameter type is not dependent. 6515 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6516 if (FirstParamType->isDependentType()) 6517 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6518 << FnDecl->getDeclName() << ExpectedFirstParamType; 6519 6520 // Check that the first parameter type is what we expect. 6521 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6522 ExpectedFirstParamType) 6523 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6524 << FnDecl->getDeclName() << ExpectedFirstParamType; 6525 6526 return false; 6527} 6528 6529static bool 6530CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6531 // C++ [basic.stc.dynamic.allocation]p1: 6532 // A program is ill-formed if an allocation function is declared in a 6533 // namespace scope other than global scope or declared static in global 6534 // scope. 6535 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6536 return true; 6537 6538 CanQualType SizeTy = 6539 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6540 6541 // C++ [basic.stc.dynamic.allocation]p1: 6542 // The return type shall be void*. The first parameter shall have type 6543 // std::size_t. 6544 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6545 SizeTy, 6546 diag::err_operator_new_dependent_param_type, 6547 diag::err_operator_new_param_type)) 6548 return true; 6549 6550 // C++ [basic.stc.dynamic.allocation]p1: 6551 // The first parameter shall not have an associated default argument. 6552 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6553 return SemaRef.Diag(FnDecl->getLocation(), 6554 diag::err_operator_new_default_arg) 6555 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6556 6557 return false; 6558} 6559 6560static bool 6561CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6562 // C++ [basic.stc.dynamic.deallocation]p1: 6563 // A program is ill-formed if deallocation functions are declared in a 6564 // namespace scope other than global scope or declared static in global 6565 // scope. 6566 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6567 return true; 6568 6569 // C++ [basic.stc.dynamic.deallocation]p2: 6570 // Each deallocation function shall return void and its first parameter 6571 // shall be void*. 6572 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6573 SemaRef.Context.VoidPtrTy, 6574 diag::err_operator_delete_dependent_param_type, 6575 diag::err_operator_delete_param_type)) 6576 return true; 6577 6578 return false; 6579} 6580 6581/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6582/// of this overloaded operator is well-formed. If so, returns false; 6583/// otherwise, emits appropriate diagnostics and returns true. 6584bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6585 assert(FnDecl && FnDecl->isOverloadedOperator() && 6586 "Expected an overloaded operator declaration"); 6587 6588 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6589 6590 // C++ [over.oper]p5: 6591 // The allocation and deallocation functions, operator new, 6592 // operator new[], operator delete and operator delete[], are 6593 // described completely in 3.7.3. The attributes and restrictions 6594 // found in the rest of this subclause do not apply to them unless 6595 // explicitly stated in 3.7.3. 6596 if (Op == OO_Delete || Op == OO_Array_Delete) 6597 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6598 6599 if (Op == OO_New || Op == OO_Array_New) 6600 return CheckOperatorNewDeclaration(*this, FnDecl); 6601 6602 // C++ [over.oper]p6: 6603 // An operator function shall either be a non-static member 6604 // function or be a non-member function and have at least one 6605 // parameter whose type is a class, a reference to a class, an 6606 // enumeration, or a reference to an enumeration. 6607 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6608 if (MethodDecl->isStatic()) 6609 return Diag(FnDecl->getLocation(), 6610 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6611 } else { 6612 bool ClassOrEnumParam = false; 6613 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6614 ParamEnd = FnDecl->param_end(); 6615 Param != ParamEnd; ++Param) { 6616 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6617 if (ParamType->isDependentType() || ParamType->isRecordType() || 6618 ParamType->isEnumeralType()) { 6619 ClassOrEnumParam = true; 6620 break; 6621 } 6622 } 6623 6624 if (!ClassOrEnumParam) 6625 return Diag(FnDecl->getLocation(), 6626 diag::err_operator_overload_needs_class_or_enum) 6627 << FnDecl->getDeclName(); 6628 } 6629 6630 // C++ [over.oper]p8: 6631 // An operator function cannot have default arguments (8.3.6), 6632 // except where explicitly stated below. 6633 // 6634 // Only the function-call operator allows default arguments 6635 // (C++ [over.call]p1). 6636 if (Op != OO_Call) { 6637 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6638 Param != FnDecl->param_end(); ++Param) { 6639 if ((*Param)->hasDefaultArg()) 6640 return Diag((*Param)->getLocation(), 6641 diag::err_operator_overload_default_arg) 6642 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6643 } 6644 } 6645 6646 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6647 { false, false, false } 6648#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6649 , { Unary, Binary, MemberOnly } 6650#include "clang/Basic/OperatorKinds.def" 6651 }; 6652 6653 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6654 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6655 bool MustBeMemberOperator = OperatorUses[Op][2]; 6656 6657 // C++ [over.oper]p8: 6658 // [...] Operator functions cannot have more or fewer parameters 6659 // than the number required for the corresponding operator, as 6660 // described in the rest of this subclause. 6661 unsigned NumParams = FnDecl->getNumParams() 6662 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6663 if (Op != OO_Call && 6664 ((NumParams == 1 && !CanBeUnaryOperator) || 6665 (NumParams == 2 && !CanBeBinaryOperator) || 6666 (NumParams < 1) || (NumParams > 2))) { 6667 // We have the wrong number of parameters. 6668 unsigned ErrorKind; 6669 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6670 ErrorKind = 2; // 2 -> unary or binary. 6671 } else if (CanBeUnaryOperator) { 6672 ErrorKind = 0; // 0 -> unary 6673 } else { 6674 assert(CanBeBinaryOperator && 6675 "All non-call overloaded operators are unary or binary!"); 6676 ErrorKind = 1; // 1 -> binary 6677 } 6678 6679 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6680 << FnDecl->getDeclName() << NumParams << ErrorKind; 6681 } 6682 6683 // Overloaded operators other than operator() cannot be variadic. 6684 if (Op != OO_Call && 6685 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6686 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6687 << FnDecl->getDeclName(); 6688 } 6689 6690 // Some operators must be non-static member functions. 6691 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6692 return Diag(FnDecl->getLocation(), 6693 diag::err_operator_overload_must_be_member) 6694 << FnDecl->getDeclName(); 6695 } 6696 6697 // C++ [over.inc]p1: 6698 // The user-defined function called operator++ implements the 6699 // prefix and postfix ++ operator. If this function is a member 6700 // function with no parameters, or a non-member function with one 6701 // parameter of class or enumeration type, it defines the prefix 6702 // increment operator ++ for objects of that type. If the function 6703 // is a member function with one parameter (which shall be of type 6704 // int) or a non-member function with two parameters (the second 6705 // of which shall be of type int), it defines the postfix 6706 // increment operator ++ for objects of that type. 6707 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6708 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6709 bool ParamIsInt = false; 6710 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6711 ParamIsInt = BT->getKind() == BuiltinType::Int; 6712 6713 if (!ParamIsInt) 6714 return Diag(LastParam->getLocation(), 6715 diag::err_operator_overload_post_incdec_must_be_int) 6716 << LastParam->getType() << (Op == OO_MinusMinus); 6717 } 6718 6719 return false; 6720} 6721 6722/// CheckLiteralOperatorDeclaration - Check whether the declaration 6723/// of this literal operator function is well-formed. If so, returns 6724/// false; otherwise, emits appropriate diagnostics and returns true. 6725bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6726 DeclContext *DC = FnDecl->getDeclContext(); 6727 Decl::Kind Kind = DC->getDeclKind(); 6728 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6729 Kind != Decl::LinkageSpec) { 6730 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6731 << FnDecl->getDeclName(); 6732 return true; 6733 } 6734 6735 bool Valid = false; 6736 6737 // template <char...> type operator "" name() is the only valid template 6738 // signature, and the only valid signature with no parameters. 6739 if (FnDecl->param_size() == 0) { 6740 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6741 // Must have only one template parameter 6742 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6743 if (Params->size() == 1) { 6744 NonTypeTemplateParmDecl *PmDecl = 6745 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6746 6747 // The template parameter must be a char parameter pack. 6748 if (PmDecl && PmDecl->isTemplateParameterPack() && 6749 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6750 Valid = true; 6751 } 6752 } 6753 } else { 6754 // Check the first parameter 6755 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6756 6757 QualType T = (*Param)->getType(); 6758 6759 // unsigned long long int, long double, and any character type are allowed 6760 // as the only parameters. 6761 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6762 Context.hasSameType(T, Context.LongDoubleTy) || 6763 Context.hasSameType(T, Context.CharTy) || 6764 Context.hasSameType(T, Context.WCharTy) || 6765 Context.hasSameType(T, Context.Char16Ty) || 6766 Context.hasSameType(T, Context.Char32Ty)) { 6767 if (++Param == FnDecl->param_end()) 6768 Valid = true; 6769 goto FinishedParams; 6770 } 6771 6772 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6773 const PointerType *PT = T->getAs<PointerType>(); 6774 if (!PT) 6775 goto FinishedParams; 6776 T = PT->getPointeeType(); 6777 if (!T.isConstQualified()) 6778 goto FinishedParams; 6779 T = T.getUnqualifiedType(); 6780 6781 // Move on to the second parameter; 6782 ++Param; 6783 6784 // If there is no second parameter, the first must be a const char * 6785 if (Param == FnDecl->param_end()) { 6786 if (Context.hasSameType(T, Context.CharTy)) 6787 Valid = true; 6788 goto FinishedParams; 6789 } 6790 6791 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6792 // are allowed as the first parameter to a two-parameter function 6793 if (!(Context.hasSameType(T, Context.CharTy) || 6794 Context.hasSameType(T, Context.WCharTy) || 6795 Context.hasSameType(T, Context.Char16Ty) || 6796 Context.hasSameType(T, Context.Char32Ty))) 6797 goto FinishedParams; 6798 6799 // The second and final parameter must be an std::size_t 6800 T = (*Param)->getType().getUnqualifiedType(); 6801 if (Context.hasSameType(T, Context.getSizeType()) && 6802 ++Param == FnDecl->param_end()) 6803 Valid = true; 6804 } 6805 6806 // FIXME: This diagnostic is absolutely terrible. 6807FinishedParams: 6808 if (!Valid) { 6809 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6810 << FnDecl->getDeclName(); 6811 return true; 6812 } 6813 6814 return false; 6815} 6816 6817/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6818/// linkage specification, including the language and (if present) 6819/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6820/// the location of the language string literal, which is provided 6821/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6822/// the '{' brace. Otherwise, this linkage specification does not 6823/// have any braces. 6824Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6825 SourceLocation LangLoc, 6826 llvm::StringRef Lang, 6827 SourceLocation LBraceLoc) { 6828 LinkageSpecDecl::LanguageIDs Language; 6829 if (Lang == "\"C\"") 6830 Language = LinkageSpecDecl::lang_c; 6831 else if (Lang == "\"C++\"") 6832 Language = LinkageSpecDecl::lang_cxx; 6833 else { 6834 Diag(LangLoc, diag::err_bad_language); 6835 return 0; 6836 } 6837 6838 // FIXME: Add all the various semantics of linkage specifications 6839 6840 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6841 ExternLoc, LangLoc, Language); 6842 CurContext->addDecl(D); 6843 PushDeclContext(S, D); 6844 return D; 6845} 6846 6847/// ActOnFinishLinkageSpecification - Complete the definition of 6848/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6849/// valid, it's the position of the closing '}' brace in a linkage 6850/// specification that uses braces. 6851Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6852 Decl *LinkageSpec, 6853 SourceLocation RBraceLoc) { 6854 if (LinkageSpec) { 6855 if (RBraceLoc.isValid()) { 6856 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6857 LSDecl->setRBraceLoc(RBraceLoc); 6858 } 6859 PopDeclContext(); 6860 } 6861 return LinkageSpec; 6862} 6863 6864/// \brief Perform semantic analysis for the variable declaration that 6865/// occurs within a C++ catch clause, returning the newly-created 6866/// variable. 6867VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6868 TypeSourceInfo *TInfo, 6869 SourceLocation StartLoc, 6870 SourceLocation Loc, 6871 IdentifierInfo *Name) { 6872 bool Invalid = false; 6873 QualType ExDeclType = TInfo->getType(); 6874 6875 // Arrays and functions decay. 6876 if (ExDeclType->isArrayType()) 6877 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6878 else if (ExDeclType->isFunctionType()) 6879 ExDeclType = Context.getPointerType(ExDeclType); 6880 6881 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6882 // The exception-declaration shall not denote a pointer or reference to an 6883 // incomplete type, other than [cv] void*. 6884 // N2844 forbids rvalue references. 6885 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6886 Diag(Loc, diag::err_catch_rvalue_ref); 6887 Invalid = true; 6888 } 6889 6890 // GCC allows catching pointers and references to incomplete types 6891 // as an extension; so do we, but we warn by default. 6892 6893 QualType BaseType = ExDeclType; 6894 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6895 unsigned DK = diag::err_catch_incomplete; 6896 bool IncompleteCatchIsInvalid = true; 6897 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6898 BaseType = Ptr->getPointeeType(); 6899 Mode = 1; 6900 DK = diag::ext_catch_incomplete_ptr; 6901 IncompleteCatchIsInvalid = false; 6902 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6903 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6904 BaseType = Ref->getPointeeType(); 6905 Mode = 2; 6906 DK = diag::ext_catch_incomplete_ref; 6907 IncompleteCatchIsInvalid = false; 6908 } 6909 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6910 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6911 IncompleteCatchIsInvalid) 6912 Invalid = true; 6913 6914 if (!Invalid && !ExDeclType->isDependentType() && 6915 RequireNonAbstractType(Loc, ExDeclType, 6916 diag::err_abstract_type_in_decl, 6917 AbstractVariableType)) 6918 Invalid = true; 6919 6920 // Only the non-fragile NeXT runtime currently supports C++ catches 6921 // of ObjC types, and no runtime supports catching ObjC types by value. 6922 if (!Invalid && getLangOptions().ObjC1) { 6923 QualType T = ExDeclType; 6924 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6925 T = RT->getPointeeType(); 6926 6927 if (T->isObjCObjectType()) { 6928 Diag(Loc, diag::err_objc_object_catch); 6929 Invalid = true; 6930 } else if (T->isObjCObjectPointerType()) { 6931 if (!getLangOptions().ObjCNonFragileABI) { 6932 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6933 Invalid = true; 6934 } 6935 } 6936 } 6937 6938 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6939 ExDeclType, TInfo, SC_None, SC_None); 6940 ExDecl->setExceptionVariable(true); 6941 6942 if (!Invalid) { 6943 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6944 // C++ [except.handle]p16: 6945 // The object declared in an exception-declaration or, if the 6946 // exception-declaration does not specify a name, a temporary (12.2) is 6947 // copy-initialized (8.5) from the exception object. [...] 6948 // The object is destroyed when the handler exits, after the destruction 6949 // of any automatic objects initialized within the handler. 6950 // 6951 // We just pretend to initialize the object with itself, then make sure 6952 // it can be destroyed later. 6953 QualType initType = ExDeclType; 6954 6955 InitializedEntity entity = 6956 InitializedEntity::InitializeVariable(ExDecl); 6957 InitializationKind initKind = 6958 InitializationKind::CreateCopy(Loc, SourceLocation()); 6959 6960 Expr *opaqueValue = 6961 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6962 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6963 ExprResult result = sequence.Perform(*this, entity, initKind, 6964 MultiExprArg(&opaqueValue, 1)); 6965 if (result.isInvalid()) 6966 Invalid = true; 6967 else { 6968 // If the constructor used was non-trivial, set this as the 6969 // "initializer". 6970 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6971 if (!construct->getConstructor()->isTrivial()) { 6972 Expr *init = MaybeCreateExprWithCleanups(construct); 6973 ExDecl->setInit(init); 6974 } 6975 6976 // And make sure it's destructable. 6977 FinalizeVarWithDestructor(ExDecl, recordType); 6978 } 6979 } 6980 } 6981 6982 if (Invalid) 6983 ExDecl->setInvalidDecl(); 6984 6985 return ExDecl; 6986} 6987 6988/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6989/// handler. 6990Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6991 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6992 bool Invalid = D.isInvalidType(); 6993 6994 // Check for unexpanded parameter packs. 6995 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6996 UPPC_ExceptionType)) { 6997 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6998 D.getIdentifierLoc()); 6999 Invalid = true; 7000 } 7001 7002 IdentifierInfo *II = D.getIdentifier(); 7003 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7004 LookupOrdinaryName, 7005 ForRedeclaration)) { 7006 // The scope should be freshly made just for us. There is just no way 7007 // it contains any previous declaration. 7008 assert(!S->isDeclScope(PrevDecl)); 7009 if (PrevDecl->isTemplateParameter()) { 7010 // Maybe we will complain about the shadowed template parameter. 7011 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7012 } 7013 } 7014 7015 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7016 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7017 << D.getCXXScopeSpec().getRange(); 7018 Invalid = true; 7019 } 7020 7021 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7022 D.getSourceRange().getBegin(), 7023 D.getIdentifierLoc(), 7024 D.getIdentifier()); 7025 if (Invalid) 7026 ExDecl->setInvalidDecl(); 7027 7028 // Add the exception declaration into this scope. 7029 if (II) 7030 PushOnScopeChains(ExDecl, S); 7031 else 7032 CurContext->addDecl(ExDecl); 7033 7034 ProcessDeclAttributes(S, ExDecl, D); 7035 return ExDecl; 7036} 7037 7038Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7039 Expr *AssertExpr, 7040 Expr *AssertMessageExpr_, 7041 SourceLocation RParenLoc) { 7042 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7043 7044 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7045 llvm::APSInt Value(32); 7046 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7047 Diag(StaticAssertLoc, 7048 diag::err_static_assert_expression_is_not_constant) << 7049 AssertExpr->getSourceRange(); 7050 return 0; 7051 } 7052 7053 if (Value == 0) { 7054 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7055 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7056 } 7057 } 7058 7059 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7060 return 0; 7061 7062 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7063 AssertExpr, AssertMessage, RParenLoc); 7064 7065 CurContext->addDecl(Decl); 7066 return Decl; 7067} 7068 7069/// \brief Perform semantic analysis of the given friend type declaration. 7070/// 7071/// \returns A friend declaration that. 7072FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7073 TypeSourceInfo *TSInfo) { 7074 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7075 7076 QualType T = TSInfo->getType(); 7077 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7078 7079 if (!getLangOptions().CPlusPlus0x) { 7080 // C++03 [class.friend]p2: 7081 // An elaborated-type-specifier shall be used in a friend declaration 7082 // for a class.* 7083 // 7084 // * The class-key of the elaborated-type-specifier is required. 7085 if (!ActiveTemplateInstantiations.empty()) { 7086 // Do not complain about the form of friend template types during 7087 // template instantiation; we will already have complained when the 7088 // template was declared. 7089 } else if (!T->isElaboratedTypeSpecifier()) { 7090 // If we evaluated the type to a record type, suggest putting 7091 // a tag in front. 7092 if (const RecordType *RT = T->getAs<RecordType>()) { 7093 RecordDecl *RD = RT->getDecl(); 7094 7095 std::string InsertionText = std::string(" ") + RD->getKindName(); 7096 7097 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7098 << (unsigned) RD->getTagKind() 7099 << T 7100 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7101 InsertionText); 7102 } else { 7103 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7104 << T 7105 << SourceRange(FriendLoc, TypeRange.getEnd()); 7106 } 7107 } else if (T->getAs<EnumType>()) { 7108 Diag(FriendLoc, diag::ext_enum_friend) 7109 << T 7110 << SourceRange(FriendLoc, TypeRange.getEnd()); 7111 } 7112 } 7113 7114 // C++0x [class.friend]p3: 7115 // If the type specifier in a friend declaration designates a (possibly 7116 // cv-qualified) class type, that class is declared as a friend; otherwise, 7117 // the friend declaration is ignored. 7118 7119 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7120 // in [class.friend]p3 that we do not implement. 7121 7122 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7123} 7124 7125/// Handle a friend tag declaration where the scope specifier was 7126/// templated. 7127Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7128 unsigned TagSpec, SourceLocation TagLoc, 7129 CXXScopeSpec &SS, 7130 IdentifierInfo *Name, SourceLocation NameLoc, 7131 AttributeList *Attr, 7132 MultiTemplateParamsArg TempParamLists) { 7133 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7134 7135 bool isExplicitSpecialization = false; 7136 bool Invalid = false; 7137 7138 if (TemplateParameterList *TemplateParams 7139 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7140 TempParamLists.get(), 7141 TempParamLists.size(), 7142 /*friend*/ true, 7143 isExplicitSpecialization, 7144 Invalid)) { 7145 if (TemplateParams->size() > 0) { 7146 // This is a declaration of a class template. 7147 if (Invalid) 7148 return 0; 7149 7150 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7151 SS, Name, NameLoc, Attr, 7152 TemplateParams, AS_public, 7153 TempParamLists.size() - 1, 7154 (TemplateParameterList**) TempParamLists.release()).take(); 7155 } else { 7156 // The "template<>" header is extraneous. 7157 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7158 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7159 isExplicitSpecialization = true; 7160 } 7161 } 7162 7163 if (Invalid) return 0; 7164 7165 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7166 7167 bool isAllExplicitSpecializations = true; 7168 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7169 if (TempParamLists.get()[I]->size()) { 7170 isAllExplicitSpecializations = false; 7171 break; 7172 } 7173 } 7174 7175 // FIXME: don't ignore attributes. 7176 7177 // If it's explicit specializations all the way down, just forget 7178 // about the template header and build an appropriate non-templated 7179 // friend. TODO: for source fidelity, remember the headers. 7180 if (isAllExplicitSpecializations) { 7181 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7182 ElaboratedTypeKeyword Keyword 7183 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7184 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7185 *Name, NameLoc); 7186 if (T.isNull()) 7187 return 0; 7188 7189 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7190 if (isa<DependentNameType>(T)) { 7191 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7192 TL.setKeywordLoc(TagLoc); 7193 TL.setQualifierLoc(QualifierLoc); 7194 TL.setNameLoc(NameLoc); 7195 } else { 7196 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7197 TL.setKeywordLoc(TagLoc); 7198 TL.setQualifierLoc(QualifierLoc); 7199 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7200 } 7201 7202 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7203 TSI, FriendLoc); 7204 Friend->setAccess(AS_public); 7205 CurContext->addDecl(Friend); 7206 return Friend; 7207 } 7208 7209 // Handle the case of a templated-scope friend class. e.g. 7210 // template <class T> class A<T>::B; 7211 // FIXME: we don't support these right now. 7212 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7213 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7214 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7215 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7216 TL.setKeywordLoc(TagLoc); 7217 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7218 TL.setNameLoc(NameLoc); 7219 7220 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7221 TSI, FriendLoc); 7222 Friend->setAccess(AS_public); 7223 Friend->setUnsupportedFriend(true); 7224 CurContext->addDecl(Friend); 7225 return Friend; 7226} 7227 7228 7229/// Handle a friend type declaration. This works in tandem with 7230/// ActOnTag. 7231/// 7232/// Notes on friend class templates: 7233/// 7234/// We generally treat friend class declarations as if they were 7235/// declaring a class. So, for example, the elaborated type specifier 7236/// in a friend declaration is required to obey the restrictions of a 7237/// class-head (i.e. no typedefs in the scope chain), template 7238/// parameters are required to match up with simple template-ids, &c. 7239/// However, unlike when declaring a template specialization, it's 7240/// okay to refer to a template specialization without an empty 7241/// template parameter declaration, e.g. 7242/// friend class A<T>::B<unsigned>; 7243/// We permit this as a special case; if there are any template 7244/// parameters present at all, require proper matching, i.e. 7245/// template <> template <class T> friend class A<int>::B; 7246Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7247 MultiTemplateParamsArg TempParams) { 7248 SourceLocation Loc = DS.getSourceRange().getBegin(); 7249 7250 assert(DS.isFriendSpecified()); 7251 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7252 7253 // Try to convert the decl specifier to a type. This works for 7254 // friend templates because ActOnTag never produces a ClassTemplateDecl 7255 // for a TUK_Friend. 7256 Declarator TheDeclarator(DS, Declarator::MemberContext); 7257 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7258 QualType T = TSI->getType(); 7259 if (TheDeclarator.isInvalidType()) 7260 return 0; 7261 7262 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7263 return 0; 7264 7265 // This is definitely an error in C++98. It's probably meant to 7266 // be forbidden in C++0x, too, but the specification is just 7267 // poorly written. 7268 // 7269 // The problem is with declarations like the following: 7270 // template <T> friend A<T>::foo; 7271 // where deciding whether a class C is a friend or not now hinges 7272 // on whether there exists an instantiation of A that causes 7273 // 'foo' to equal C. There are restrictions on class-heads 7274 // (which we declare (by fiat) elaborated friend declarations to 7275 // be) that makes this tractable. 7276 // 7277 // FIXME: handle "template <> friend class A<T>;", which 7278 // is possibly well-formed? Who even knows? 7279 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7280 Diag(Loc, diag::err_tagless_friend_type_template) 7281 << DS.getSourceRange(); 7282 return 0; 7283 } 7284 7285 // C++98 [class.friend]p1: A friend of a class is a function 7286 // or class that is not a member of the class . . . 7287 // This is fixed in DR77, which just barely didn't make the C++03 7288 // deadline. It's also a very silly restriction that seriously 7289 // affects inner classes and which nobody else seems to implement; 7290 // thus we never diagnose it, not even in -pedantic. 7291 // 7292 // But note that we could warn about it: it's always useless to 7293 // friend one of your own members (it's not, however, worthless to 7294 // friend a member of an arbitrary specialization of your template). 7295 7296 Decl *D; 7297 if (unsigned NumTempParamLists = TempParams.size()) 7298 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7299 NumTempParamLists, 7300 TempParams.release(), 7301 TSI, 7302 DS.getFriendSpecLoc()); 7303 else 7304 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7305 7306 if (!D) 7307 return 0; 7308 7309 D->setAccess(AS_public); 7310 CurContext->addDecl(D); 7311 7312 return D; 7313} 7314 7315Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7316 MultiTemplateParamsArg TemplateParams) { 7317 const DeclSpec &DS = D.getDeclSpec(); 7318 7319 assert(DS.isFriendSpecified()); 7320 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7321 7322 SourceLocation Loc = D.getIdentifierLoc(); 7323 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7324 QualType T = TInfo->getType(); 7325 7326 // C++ [class.friend]p1 7327 // A friend of a class is a function or class.... 7328 // Note that this sees through typedefs, which is intended. 7329 // It *doesn't* see through dependent types, which is correct 7330 // according to [temp.arg.type]p3: 7331 // If a declaration acquires a function type through a 7332 // type dependent on a template-parameter and this causes 7333 // a declaration that does not use the syntactic form of a 7334 // function declarator to have a function type, the program 7335 // is ill-formed. 7336 if (!T->isFunctionType()) { 7337 Diag(Loc, diag::err_unexpected_friend); 7338 7339 // It might be worthwhile to try to recover by creating an 7340 // appropriate declaration. 7341 return 0; 7342 } 7343 7344 // C++ [namespace.memdef]p3 7345 // - If a friend declaration in a non-local class first declares a 7346 // class or function, the friend class or function is a member 7347 // of the innermost enclosing namespace. 7348 // - The name of the friend is not found by simple name lookup 7349 // until a matching declaration is provided in that namespace 7350 // scope (either before or after the class declaration granting 7351 // friendship). 7352 // - If a friend function is called, its name may be found by the 7353 // name lookup that considers functions from namespaces and 7354 // classes associated with the types of the function arguments. 7355 // - When looking for a prior declaration of a class or a function 7356 // declared as a friend, scopes outside the innermost enclosing 7357 // namespace scope are not considered. 7358 7359 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7360 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7361 DeclarationName Name = NameInfo.getName(); 7362 assert(Name); 7363 7364 // Check for unexpanded parameter packs. 7365 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7366 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7367 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7368 return 0; 7369 7370 // The context we found the declaration in, or in which we should 7371 // create the declaration. 7372 DeclContext *DC; 7373 Scope *DCScope = S; 7374 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7375 ForRedeclaration); 7376 7377 // FIXME: there are different rules in local classes 7378 7379 // There are four cases here. 7380 // - There's no scope specifier, in which case we just go to the 7381 // appropriate scope and look for a function or function template 7382 // there as appropriate. 7383 // Recover from invalid scope qualifiers as if they just weren't there. 7384 if (SS.isInvalid() || !SS.isSet()) { 7385 // C++0x [namespace.memdef]p3: 7386 // If the name in a friend declaration is neither qualified nor 7387 // a template-id and the declaration is a function or an 7388 // elaborated-type-specifier, the lookup to determine whether 7389 // the entity has been previously declared shall not consider 7390 // any scopes outside the innermost enclosing namespace. 7391 // C++0x [class.friend]p11: 7392 // If a friend declaration appears in a local class and the name 7393 // specified is an unqualified name, a prior declaration is 7394 // looked up without considering scopes that are outside the 7395 // innermost enclosing non-class scope. For a friend function 7396 // declaration, if there is no prior declaration, the program is 7397 // ill-formed. 7398 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7399 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7400 7401 // Find the appropriate context according to the above. 7402 DC = CurContext; 7403 while (true) { 7404 // Skip class contexts. If someone can cite chapter and verse 7405 // for this behavior, that would be nice --- it's what GCC and 7406 // EDG do, and it seems like a reasonable intent, but the spec 7407 // really only says that checks for unqualified existing 7408 // declarations should stop at the nearest enclosing namespace, 7409 // not that they should only consider the nearest enclosing 7410 // namespace. 7411 while (DC->isRecord()) 7412 DC = DC->getParent(); 7413 7414 LookupQualifiedName(Previous, DC); 7415 7416 // TODO: decide what we think about using declarations. 7417 if (isLocal || !Previous.empty()) 7418 break; 7419 7420 if (isTemplateId) { 7421 if (isa<TranslationUnitDecl>(DC)) break; 7422 } else { 7423 if (DC->isFileContext()) break; 7424 } 7425 DC = DC->getParent(); 7426 } 7427 7428 // C++ [class.friend]p1: A friend of a class is a function or 7429 // class that is not a member of the class . . . 7430 // C++0x changes this for both friend types and functions. 7431 // Most C++ 98 compilers do seem to give an error here, so 7432 // we do, too. 7433 if (!Previous.empty() && DC->Equals(CurContext) 7434 && !getLangOptions().CPlusPlus0x) 7435 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7436 7437 DCScope = getScopeForDeclContext(S, DC); 7438 7439 // - There's a non-dependent scope specifier, in which case we 7440 // compute it and do a previous lookup there for a function 7441 // or function template. 7442 } else if (!SS.getScopeRep()->isDependent()) { 7443 DC = computeDeclContext(SS); 7444 if (!DC) return 0; 7445 7446 if (RequireCompleteDeclContext(SS, DC)) return 0; 7447 7448 LookupQualifiedName(Previous, DC); 7449 7450 // Ignore things found implicitly in the wrong scope. 7451 // TODO: better diagnostics for this case. Suggesting the right 7452 // qualified scope would be nice... 7453 LookupResult::Filter F = Previous.makeFilter(); 7454 while (F.hasNext()) { 7455 NamedDecl *D = F.next(); 7456 if (!DC->InEnclosingNamespaceSetOf( 7457 D->getDeclContext()->getRedeclContext())) 7458 F.erase(); 7459 } 7460 F.done(); 7461 7462 if (Previous.empty()) { 7463 D.setInvalidType(); 7464 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7465 return 0; 7466 } 7467 7468 // C++ [class.friend]p1: A friend of a class is a function or 7469 // class that is not a member of the class . . . 7470 if (DC->Equals(CurContext)) 7471 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7472 7473 // - There's a scope specifier that does not match any template 7474 // parameter lists, in which case we use some arbitrary context, 7475 // create a method or method template, and wait for instantiation. 7476 // - There's a scope specifier that does match some template 7477 // parameter lists, which we don't handle right now. 7478 } else { 7479 DC = CurContext; 7480 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7481 } 7482 7483 if (!DC->isRecord()) { 7484 // This implies that it has to be an operator or function. 7485 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7486 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7487 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7488 Diag(Loc, diag::err_introducing_special_friend) << 7489 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7490 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7491 return 0; 7492 } 7493 } 7494 7495 bool Redeclaration = false; 7496 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7497 move(TemplateParams), 7498 IsDefinition, 7499 Redeclaration); 7500 if (!ND) return 0; 7501 7502 assert(ND->getDeclContext() == DC); 7503 assert(ND->getLexicalDeclContext() == CurContext); 7504 7505 // Add the function declaration to the appropriate lookup tables, 7506 // adjusting the redeclarations list as necessary. We don't 7507 // want to do this yet if the friending class is dependent. 7508 // 7509 // Also update the scope-based lookup if the target context's 7510 // lookup context is in lexical scope. 7511 if (!CurContext->isDependentContext()) { 7512 DC = DC->getRedeclContext(); 7513 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7514 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7515 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7516 } 7517 7518 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7519 D.getIdentifierLoc(), ND, 7520 DS.getFriendSpecLoc()); 7521 FrD->setAccess(AS_public); 7522 CurContext->addDecl(FrD); 7523 7524 if (ND->isInvalidDecl()) 7525 FrD->setInvalidDecl(); 7526 else { 7527 FunctionDecl *FD; 7528 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7529 FD = FTD->getTemplatedDecl(); 7530 else 7531 FD = cast<FunctionDecl>(ND); 7532 7533 // Mark templated-scope function declarations as unsupported. 7534 if (FD->getNumTemplateParameterLists()) 7535 FrD->setUnsupportedFriend(true); 7536 } 7537 7538 return ND; 7539} 7540 7541void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7542 AdjustDeclIfTemplate(Dcl); 7543 7544 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7545 if (!Fn) { 7546 Diag(DelLoc, diag::err_deleted_non_function); 7547 return; 7548 } 7549 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7550 Diag(DelLoc, diag::err_deleted_decl_not_first); 7551 Diag(Prev->getLocation(), diag::note_previous_declaration); 7552 // If the declaration wasn't the first, we delete the function anyway for 7553 // recovery. 7554 } 7555 Fn->setDeleted(); 7556} 7557 7558static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7559 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7560 Stmt *SubStmt = *CI; 7561 if (!SubStmt) 7562 continue; 7563 if (isa<ReturnStmt>(SubStmt)) 7564 Self.Diag(SubStmt->getSourceRange().getBegin(), 7565 diag::err_return_in_constructor_handler); 7566 if (!isa<Expr>(SubStmt)) 7567 SearchForReturnInStmt(Self, SubStmt); 7568 } 7569} 7570 7571void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7572 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7573 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7574 SearchForReturnInStmt(*this, Handler); 7575 } 7576} 7577 7578bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7579 const CXXMethodDecl *Old) { 7580 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7581 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7582 7583 if (Context.hasSameType(NewTy, OldTy) || 7584 NewTy->isDependentType() || OldTy->isDependentType()) 7585 return false; 7586 7587 // Check if the return types are covariant 7588 QualType NewClassTy, OldClassTy; 7589 7590 /// Both types must be pointers or references to classes. 7591 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7592 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7593 NewClassTy = NewPT->getPointeeType(); 7594 OldClassTy = OldPT->getPointeeType(); 7595 } 7596 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7597 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7598 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7599 NewClassTy = NewRT->getPointeeType(); 7600 OldClassTy = OldRT->getPointeeType(); 7601 } 7602 } 7603 } 7604 7605 // The return types aren't either both pointers or references to a class type. 7606 if (NewClassTy.isNull()) { 7607 Diag(New->getLocation(), 7608 diag::err_different_return_type_for_overriding_virtual_function) 7609 << New->getDeclName() << NewTy << OldTy; 7610 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7611 7612 return true; 7613 } 7614 7615 // C++ [class.virtual]p6: 7616 // If the return type of D::f differs from the return type of B::f, the 7617 // class type in the return type of D::f shall be complete at the point of 7618 // declaration of D::f or shall be the class type D. 7619 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7620 if (!RT->isBeingDefined() && 7621 RequireCompleteType(New->getLocation(), NewClassTy, 7622 PDiag(diag::err_covariant_return_incomplete) 7623 << New->getDeclName())) 7624 return true; 7625 } 7626 7627 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7628 // Check if the new class derives from the old class. 7629 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7630 Diag(New->getLocation(), 7631 diag::err_covariant_return_not_derived) 7632 << New->getDeclName() << NewTy << OldTy; 7633 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7634 return true; 7635 } 7636 7637 // Check if we the conversion from derived to base is valid. 7638 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7639 diag::err_covariant_return_inaccessible_base, 7640 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7641 // FIXME: Should this point to the return type? 7642 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7643 // FIXME: this note won't trigger for delayed access control 7644 // diagnostics, and it's impossible to get an undelayed error 7645 // here from access control during the original parse because 7646 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7647 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7648 return true; 7649 } 7650 } 7651 7652 // The qualifiers of the return types must be the same. 7653 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7654 Diag(New->getLocation(), 7655 diag::err_covariant_return_type_different_qualifications) 7656 << New->getDeclName() << NewTy << OldTy; 7657 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7658 return true; 7659 }; 7660 7661 7662 // The new class type must have the same or less qualifiers as the old type. 7663 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7664 Diag(New->getLocation(), 7665 diag::err_covariant_return_type_class_type_more_qualified) 7666 << New->getDeclName() << NewTy << OldTy; 7667 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7668 return true; 7669 }; 7670 7671 return false; 7672} 7673 7674/// \brief Mark the given method pure. 7675/// 7676/// \param Method the method to be marked pure. 7677/// 7678/// \param InitRange the source range that covers the "0" initializer. 7679bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7680 SourceLocation EndLoc = InitRange.getEnd(); 7681 if (EndLoc.isValid()) 7682 Method->setRangeEnd(EndLoc); 7683 7684 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7685 Method->setPure(); 7686 return false; 7687 } 7688 7689 if (!Method->isInvalidDecl()) 7690 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7691 << Method->getDeclName() << InitRange; 7692 return true; 7693} 7694 7695/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7696/// an initializer for the out-of-line declaration 'Dcl'. The scope 7697/// is a fresh scope pushed for just this purpose. 7698/// 7699/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7700/// static data member of class X, names should be looked up in the scope of 7701/// class X. 7702void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7703 // If there is no declaration, there was an error parsing it. 7704 if (D == 0 || D->isInvalidDecl()) return; 7705 7706 // We should only get called for declarations with scope specifiers, like: 7707 // int foo::bar; 7708 assert(D->isOutOfLine()); 7709 EnterDeclaratorContext(S, D->getDeclContext()); 7710} 7711 7712/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7713/// initializer for the out-of-line declaration 'D'. 7714void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7715 // If there is no declaration, there was an error parsing it. 7716 if (D == 0 || D->isInvalidDecl()) return; 7717 7718 assert(D->isOutOfLine()); 7719 ExitDeclaratorContext(S); 7720} 7721 7722/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7723/// C++ if/switch/while/for statement. 7724/// e.g: "if (int x = f()) {...}" 7725DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7726 // C++ 6.4p2: 7727 // The declarator shall not specify a function or an array. 7728 // The type-specifier-seq shall not contain typedef and shall not declare a 7729 // new class or enumeration. 7730 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7731 "Parser allowed 'typedef' as storage class of condition decl."); 7732 7733 TagDecl *OwnedTag = 0; 7734 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7735 QualType Ty = TInfo->getType(); 7736 7737 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7738 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7739 // would be created and CXXConditionDeclExpr wants a VarDecl. 7740 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7741 << D.getSourceRange(); 7742 return DeclResult(); 7743 } else if (OwnedTag && OwnedTag->isDefinition()) { 7744 // The type-specifier-seq shall not declare a new class or enumeration. 7745 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7746 } 7747 7748 Decl *Dcl = ActOnDeclarator(S, D); 7749 if (!Dcl) 7750 return DeclResult(); 7751 7752 return Dcl; 7753} 7754 7755void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7756 bool DefinitionRequired) { 7757 // Ignore any vtable uses in unevaluated operands or for classes that do 7758 // not have a vtable. 7759 if (!Class->isDynamicClass() || Class->isDependentContext() || 7760 CurContext->isDependentContext() || 7761 ExprEvalContexts.back().Context == Unevaluated) 7762 return; 7763 7764 // Try to insert this class into the map. 7765 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7766 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7767 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7768 if (!Pos.second) { 7769 // If we already had an entry, check to see if we are promoting this vtable 7770 // to required a definition. If so, we need to reappend to the VTableUses 7771 // list, since we may have already processed the first entry. 7772 if (DefinitionRequired && !Pos.first->second) { 7773 Pos.first->second = true; 7774 } else { 7775 // Otherwise, we can early exit. 7776 return; 7777 } 7778 } 7779 7780 // Local classes need to have their virtual members marked 7781 // immediately. For all other classes, we mark their virtual members 7782 // at the end of the translation unit. 7783 if (Class->isLocalClass()) 7784 MarkVirtualMembersReferenced(Loc, Class); 7785 else 7786 VTableUses.push_back(std::make_pair(Class, Loc)); 7787} 7788 7789bool Sema::DefineUsedVTables() { 7790 if (VTableUses.empty()) 7791 return false; 7792 7793 // Note: The VTableUses vector could grow as a result of marking 7794 // the members of a class as "used", so we check the size each 7795 // time through the loop and prefer indices (with are stable) to 7796 // iterators (which are not). 7797 bool DefinedAnything = false; 7798 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7799 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7800 if (!Class) 7801 continue; 7802 7803 SourceLocation Loc = VTableUses[I].second; 7804 7805 // If this class has a key function, but that key function is 7806 // defined in another translation unit, we don't need to emit the 7807 // vtable even though we're using it. 7808 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7809 if (KeyFunction && !KeyFunction->hasBody()) { 7810 switch (KeyFunction->getTemplateSpecializationKind()) { 7811 case TSK_Undeclared: 7812 case TSK_ExplicitSpecialization: 7813 case TSK_ExplicitInstantiationDeclaration: 7814 // The key function is in another translation unit. 7815 continue; 7816 7817 case TSK_ExplicitInstantiationDefinition: 7818 case TSK_ImplicitInstantiation: 7819 // We will be instantiating the key function. 7820 break; 7821 } 7822 } else if (!KeyFunction) { 7823 // If we have a class with no key function that is the subject 7824 // of an explicit instantiation declaration, suppress the 7825 // vtable; it will live with the explicit instantiation 7826 // definition. 7827 bool IsExplicitInstantiationDeclaration 7828 = Class->getTemplateSpecializationKind() 7829 == TSK_ExplicitInstantiationDeclaration; 7830 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7831 REnd = Class->redecls_end(); 7832 R != REnd; ++R) { 7833 TemplateSpecializationKind TSK 7834 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7835 if (TSK == TSK_ExplicitInstantiationDeclaration) 7836 IsExplicitInstantiationDeclaration = true; 7837 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7838 IsExplicitInstantiationDeclaration = false; 7839 break; 7840 } 7841 } 7842 7843 if (IsExplicitInstantiationDeclaration) 7844 continue; 7845 } 7846 7847 // Mark all of the virtual members of this class as referenced, so 7848 // that we can build a vtable. Then, tell the AST consumer that a 7849 // vtable for this class is required. 7850 DefinedAnything = true; 7851 MarkVirtualMembersReferenced(Loc, Class); 7852 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7853 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7854 7855 // Optionally warn if we're emitting a weak vtable. 7856 if (Class->getLinkage() == ExternalLinkage && 7857 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7858 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7859 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7860 } 7861 } 7862 VTableUses.clear(); 7863 7864 return DefinedAnything; 7865} 7866 7867void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7868 const CXXRecordDecl *RD) { 7869 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7870 e = RD->method_end(); i != e; ++i) { 7871 CXXMethodDecl *MD = *i; 7872 7873 // C++ [basic.def.odr]p2: 7874 // [...] A virtual member function is used if it is not pure. [...] 7875 if (MD->isVirtual() && !MD->isPure()) 7876 MarkDeclarationReferenced(Loc, MD); 7877 } 7878 7879 // Only classes that have virtual bases need a VTT. 7880 if (RD->getNumVBases() == 0) 7881 return; 7882 7883 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7884 e = RD->bases_end(); i != e; ++i) { 7885 const CXXRecordDecl *Base = 7886 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7887 if (Base->getNumVBases() == 0) 7888 continue; 7889 MarkVirtualMembersReferenced(Loc, Base); 7890 } 7891} 7892 7893/// SetIvarInitializers - This routine builds initialization ASTs for the 7894/// Objective-C implementation whose ivars need be initialized. 7895void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7896 if (!getLangOptions().CPlusPlus) 7897 return; 7898 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7899 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7900 CollectIvarsToConstructOrDestruct(OID, ivars); 7901 if (ivars.empty()) 7902 return; 7903 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7904 for (unsigned i = 0; i < ivars.size(); i++) { 7905 FieldDecl *Field = ivars[i]; 7906 if (Field->isInvalidDecl()) 7907 continue; 7908 7909 CXXCtorInitializer *Member; 7910 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7911 InitializationKind InitKind = 7912 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7913 7914 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7915 ExprResult MemberInit = 7916 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7917 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7918 // Note, MemberInit could actually come back empty if no initialization 7919 // is required (e.g., because it would call a trivial default constructor) 7920 if (!MemberInit.get() || MemberInit.isInvalid()) 7921 continue; 7922 7923 Member = 7924 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7925 SourceLocation(), 7926 MemberInit.takeAs<Expr>(), 7927 SourceLocation()); 7928 AllToInit.push_back(Member); 7929 7930 // Be sure that the destructor is accessible and is marked as referenced. 7931 if (const RecordType *RecordTy 7932 = Context.getBaseElementType(Field->getType()) 7933 ->getAs<RecordType>()) { 7934 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7935 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7936 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7937 CheckDestructorAccess(Field->getLocation(), Destructor, 7938 PDiag(diag::err_access_dtor_ivar) 7939 << Context.getBaseElementType(Field->getType())); 7940 } 7941 } 7942 } 7943 ObjCImplementation->setIvarInitializers(Context, 7944 AllToInit.data(), AllToInit.size()); 7945 } 7946} 7947 7948static 7949void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 7950 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 7951 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 7952 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 7953 Sema &S) { 7954 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 7955 CE = Current.end(); 7956 if (Ctor->isInvalidDecl()) 7957 return; 7958 7959 const FunctionDecl *FNTarget = 0; 7960 CXXConstructorDecl *Target; 7961 7962 // We ignore the result here since if we don't have a body, Target will be 7963 // null below. 7964 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 7965 Target 7966= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 7967 7968 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 7969 // Avoid dereferencing a null pointer here. 7970 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 7971 7972 if (!Current.insert(Canonical)) 7973 return; 7974 7975 // We know that beyond here, we aren't chaining into a cycle. 7976 if (!Target || !Target->isDelegatingConstructor() || 7977 Target->isInvalidDecl() || Valid.count(TCanonical)) { 7978 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 7979 Valid.insert(*CI); 7980 Current.clear(); 7981 // We've hit a cycle. 7982 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 7983 Current.count(TCanonical)) { 7984 // If we haven't diagnosed this cycle yet, do so now. 7985 if (!Invalid.count(TCanonical)) { 7986 S.Diag((*Ctor->init_begin())->getSourceLocation(), 7987 diag::err_delegating_ctor_cycle) 7988 << Ctor; 7989 7990 // Don't add a note for a function delegating directo to itself. 7991 if (TCanonical != Canonical) 7992 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 7993 7994 CXXConstructorDecl *C = Target; 7995 while (C->getCanonicalDecl() != Canonical) { 7996 (void)C->getTargetConstructor()->hasBody(FNTarget); 7997 assert(FNTarget && "Ctor cycle through bodiless function"); 7998 7999 C 8000 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8001 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8002 } 8003 } 8004 8005 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8006 Invalid.insert(*CI); 8007 Current.clear(); 8008 } else { 8009 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8010 } 8011} 8012 8013 8014void Sema::CheckDelegatingCtorCycles() { 8015 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8016 8017 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8018 CE = Current.end(); 8019 8020 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8021 I = DelegatingCtorDecls.begin(), 8022 E = DelegatingCtorDecls.end(); 8023 I != E; ++I) { 8024 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8025 } 8026 8027 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8028 (*CI)->setInvalidDecl(); 8029} 8030