SemaDeclCXX.cpp revision fa74c2344addf92826c938758fb4dc612a004eb9
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 = ConExpr->getConstructor(); 1551 assert(Constructor && "Delegating constructor with no target?"); 1552 1553 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1554 1555 // C++0x [class.base.init]p7: 1556 // The initialization of each base and member constitutes a 1557 // full-expression. 1558 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1559 if (DelegationInit.isInvalid()) 1560 return true; 1561 1562 // If we are in a dependent context, template instantiation will 1563 // perform this type-checking again. Just save the arguments that we 1564 // received in a ParenListExpr. 1565 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1566 // of the information that we have about the base 1567 // initializer. However, deconstructing the ASTs is a dicey process, 1568 // and this approach is far more likely to get the corner cases right. 1569 if (CurContext->isDependentContext()) { 1570 ExprResult Init 1571 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1572 NumArgs, RParenLoc)); 1573 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1574 Constructor, Init.takeAs<Expr>(), 1575 RParenLoc); 1576 } 1577 1578 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1579 DelegationInit.takeAs<Expr>(), 1580 RParenLoc); 1581} 1582 1583MemInitResult 1584Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1585 Expr **Args, unsigned NumArgs, 1586 SourceLocation LParenLoc, SourceLocation RParenLoc, 1587 CXXRecordDecl *ClassDecl, 1588 SourceLocation EllipsisLoc) { 1589 bool HasDependentArg = false; 1590 for (unsigned i = 0; i < NumArgs; i++) 1591 HasDependentArg |= Args[i]->isTypeDependent(); 1592 1593 SourceLocation BaseLoc 1594 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1595 1596 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1597 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1598 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1599 1600 // C++ [class.base.init]p2: 1601 // [...] Unless the mem-initializer-id names a nonstatic data 1602 // member of the constructor's class or a direct or virtual base 1603 // of that class, the mem-initializer is ill-formed. A 1604 // mem-initializer-list can initialize a base class using any 1605 // name that denotes that base class type. 1606 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1607 1608 if (EllipsisLoc.isValid()) { 1609 // This is a pack expansion. 1610 if (!BaseType->containsUnexpandedParameterPack()) { 1611 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1612 << SourceRange(BaseLoc, RParenLoc); 1613 1614 EllipsisLoc = SourceLocation(); 1615 } 1616 } else { 1617 // Check for any unexpanded parameter packs. 1618 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1619 return true; 1620 1621 for (unsigned I = 0; I != NumArgs; ++I) 1622 if (DiagnoseUnexpandedParameterPack(Args[I])) 1623 return true; 1624 } 1625 1626 // Check for direct and virtual base classes. 1627 const CXXBaseSpecifier *DirectBaseSpec = 0; 1628 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1629 if (!Dependent) { 1630 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1631 BaseType)) 1632 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1633 LParenLoc, RParenLoc, ClassDecl); 1634 1635 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1636 VirtualBaseSpec); 1637 1638 // C++ [base.class.init]p2: 1639 // Unless the mem-initializer-id names a nonstatic data member of the 1640 // constructor's class or a direct or virtual base of that class, the 1641 // mem-initializer is ill-formed. 1642 if (!DirectBaseSpec && !VirtualBaseSpec) { 1643 // If the class has any dependent bases, then it's possible that 1644 // one of those types will resolve to the same type as 1645 // BaseType. Therefore, just treat this as a dependent base 1646 // class initialization. FIXME: Should we try to check the 1647 // initialization anyway? It seems odd. 1648 if (ClassDecl->hasAnyDependentBases()) 1649 Dependent = true; 1650 else 1651 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1652 << BaseType << Context.getTypeDeclType(ClassDecl) 1653 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1654 } 1655 } 1656 1657 if (Dependent) { 1658 // Can't check initialization for a base of dependent type or when 1659 // any of the arguments are type-dependent expressions. 1660 ExprResult BaseInit 1661 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1662 RParenLoc)); 1663 1664 // Erase any temporaries within this evaluation context; we're not 1665 // going to track them in the AST, since we'll be rebuilding the 1666 // ASTs during template instantiation. 1667 ExprTemporaries.erase( 1668 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1669 ExprTemporaries.end()); 1670 1671 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1672 /*IsVirtual=*/false, 1673 LParenLoc, 1674 BaseInit.takeAs<Expr>(), 1675 RParenLoc, 1676 EllipsisLoc); 1677 } 1678 1679 // C++ [base.class.init]p2: 1680 // If a mem-initializer-id is ambiguous because it designates both 1681 // a direct non-virtual base class and an inherited virtual base 1682 // class, the mem-initializer is ill-formed. 1683 if (DirectBaseSpec && VirtualBaseSpec) 1684 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1685 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1686 1687 CXXBaseSpecifier *BaseSpec 1688 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1689 if (!BaseSpec) 1690 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1691 1692 // Initialize the base. 1693 InitializedEntity BaseEntity = 1694 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1695 InitializationKind Kind = 1696 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1697 1698 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1699 1700 ExprResult BaseInit = 1701 InitSeq.Perform(*this, BaseEntity, Kind, 1702 MultiExprArg(*this, Args, NumArgs), 0); 1703 if (BaseInit.isInvalid()) 1704 return true; 1705 1706 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1707 1708 // C++0x [class.base.init]p7: 1709 // The initialization of each base and member constitutes a 1710 // full-expression. 1711 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1712 if (BaseInit.isInvalid()) 1713 return true; 1714 1715 // If we are in a dependent context, template instantiation will 1716 // perform this type-checking again. Just save the arguments that we 1717 // received in a ParenListExpr. 1718 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1719 // of the information that we have about the base 1720 // initializer. However, deconstructing the ASTs is a dicey process, 1721 // and this approach is far more likely to get the corner cases right. 1722 if (CurContext->isDependentContext()) { 1723 ExprResult Init 1724 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1725 RParenLoc)); 1726 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1727 BaseSpec->isVirtual(), 1728 LParenLoc, 1729 Init.takeAs<Expr>(), 1730 RParenLoc, 1731 EllipsisLoc); 1732 } 1733 1734 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1735 BaseSpec->isVirtual(), 1736 LParenLoc, 1737 BaseInit.takeAs<Expr>(), 1738 RParenLoc, 1739 EllipsisLoc); 1740} 1741 1742/// ImplicitInitializerKind - How an implicit base or member initializer should 1743/// initialize its base or member. 1744enum ImplicitInitializerKind { 1745 IIK_Default, 1746 IIK_Copy, 1747 IIK_Move 1748}; 1749 1750static bool 1751BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1752 ImplicitInitializerKind ImplicitInitKind, 1753 CXXBaseSpecifier *BaseSpec, 1754 bool IsInheritedVirtualBase, 1755 CXXCtorInitializer *&CXXBaseInit) { 1756 InitializedEntity InitEntity 1757 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1758 IsInheritedVirtualBase); 1759 1760 ExprResult BaseInit; 1761 1762 switch (ImplicitInitKind) { 1763 case IIK_Default: { 1764 InitializationKind InitKind 1765 = InitializationKind::CreateDefault(Constructor->getLocation()); 1766 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1767 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1768 MultiExprArg(SemaRef, 0, 0)); 1769 break; 1770 } 1771 1772 case IIK_Copy: { 1773 ParmVarDecl *Param = Constructor->getParamDecl(0); 1774 QualType ParamType = Param->getType().getNonReferenceType(); 1775 1776 Expr *CopyCtorArg = 1777 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1778 Constructor->getLocation(), ParamType, 1779 VK_LValue, 0); 1780 1781 // Cast to the base class to avoid ambiguities. 1782 QualType ArgTy = 1783 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1784 ParamType.getQualifiers()); 1785 1786 CXXCastPath BasePath; 1787 BasePath.push_back(BaseSpec); 1788 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1789 CK_UncheckedDerivedToBase, 1790 VK_LValue, &BasePath).take(); 1791 1792 InitializationKind InitKind 1793 = InitializationKind::CreateDirect(Constructor->getLocation(), 1794 SourceLocation(), SourceLocation()); 1795 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1796 &CopyCtorArg, 1); 1797 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1798 MultiExprArg(&CopyCtorArg, 1)); 1799 break; 1800 } 1801 1802 case IIK_Move: 1803 assert(false && "Unhandled initializer kind!"); 1804 } 1805 1806 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1807 if (BaseInit.isInvalid()) 1808 return true; 1809 1810 CXXBaseInit = 1811 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1812 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1813 SourceLocation()), 1814 BaseSpec->isVirtual(), 1815 SourceLocation(), 1816 BaseInit.takeAs<Expr>(), 1817 SourceLocation(), 1818 SourceLocation()); 1819 1820 return false; 1821} 1822 1823static bool 1824BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1825 ImplicitInitializerKind ImplicitInitKind, 1826 FieldDecl *Field, 1827 CXXCtorInitializer *&CXXMemberInit) { 1828 if (Field->isInvalidDecl()) 1829 return true; 1830 1831 SourceLocation Loc = Constructor->getLocation(); 1832 1833 if (ImplicitInitKind == IIK_Copy) { 1834 ParmVarDecl *Param = Constructor->getParamDecl(0); 1835 QualType ParamType = Param->getType().getNonReferenceType(); 1836 1837 Expr *MemberExprBase = 1838 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1839 Loc, ParamType, VK_LValue, 0); 1840 1841 // Build a reference to this field within the parameter. 1842 CXXScopeSpec SS; 1843 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1844 Sema::LookupMemberName); 1845 MemberLookup.addDecl(Field, AS_public); 1846 MemberLookup.resolveKind(); 1847 ExprResult CopyCtorArg 1848 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1849 ParamType, Loc, 1850 /*IsArrow=*/false, 1851 SS, 1852 /*FirstQualifierInScope=*/0, 1853 MemberLookup, 1854 /*TemplateArgs=*/0); 1855 if (CopyCtorArg.isInvalid()) 1856 return true; 1857 1858 // When the field we are copying is an array, create index variables for 1859 // each dimension of the array. We use these index variables to subscript 1860 // the source array, and other clients (e.g., CodeGen) will perform the 1861 // necessary iteration with these index variables. 1862 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1863 QualType BaseType = Field->getType(); 1864 QualType SizeType = SemaRef.Context.getSizeType(); 1865 while (const ConstantArrayType *Array 1866 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1867 // Create the iteration variable for this array index. 1868 IdentifierInfo *IterationVarName = 0; 1869 { 1870 llvm::SmallString<8> Str; 1871 llvm::raw_svector_ostream OS(Str); 1872 OS << "__i" << IndexVariables.size(); 1873 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1874 } 1875 VarDecl *IterationVar 1876 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1877 IterationVarName, SizeType, 1878 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1879 SC_None, SC_None); 1880 IndexVariables.push_back(IterationVar); 1881 1882 // Create a reference to the iteration variable. 1883 ExprResult IterationVarRef 1884 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1885 assert(!IterationVarRef.isInvalid() && 1886 "Reference to invented variable cannot fail!"); 1887 1888 // Subscript the array with this iteration variable. 1889 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1890 Loc, 1891 IterationVarRef.take(), 1892 Loc); 1893 if (CopyCtorArg.isInvalid()) 1894 return true; 1895 1896 BaseType = Array->getElementType(); 1897 } 1898 1899 // Construct the entity that we will be initializing. For an array, this 1900 // will be first element in the array, which may require several levels 1901 // of array-subscript entities. 1902 llvm::SmallVector<InitializedEntity, 4> Entities; 1903 Entities.reserve(1 + IndexVariables.size()); 1904 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1905 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1906 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1907 0, 1908 Entities.back())); 1909 1910 // Direct-initialize to use the copy constructor. 1911 InitializationKind InitKind = 1912 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1913 1914 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1915 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1916 &CopyCtorArgE, 1); 1917 1918 ExprResult MemberInit 1919 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1920 MultiExprArg(&CopyCtorArgE, 1)); 1921 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1922 if (MemberInit.isInvalid()) 1923 return true; 1924 1925 CXXMemberInit 1926 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1927 MemberInit.takeAs<Expr>(), Loc, 1928 IndexVariables.data(), 1929 IndexVariables.size()); 1930 return false; 1931 } 1932 1933 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1934 1935 QualType FieldBaseElementType = 1936 SemaRef.Context.getBaseElementType(Field->getType()); 1937 1938 if (FieldBaseElementType->isRecordType()) { 1939 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1940 InitializationKind InitKind = 1941 InitializationKind::CreateDefault(Loc); 1942 1943 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1944 ExprResult MemberInit = 1945 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1946 1947 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1948 if (MemberInit.isInvalid()) 1949 return true; 1950 1951 CXXMemberInit = 1952 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1953 Field, Loc, Loc, 1954 MemberInit.get(), 1955 Loc); 1956 return false; 1957 } 1958 1959 if (FieldBaseElementType->isReferenceType()) { 1960 SemaRef.Diag(Constructor->getLocation(), 1961 diag::err_uninitialized_member_in_ctor) 1962 << (int)Constructor->isImplicit() 1963 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1964 << 0 << Field->getDeclName(); 1965 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1966 return true; 1967 } 1968 1969 if (FieldBaseElementType.isConstQualified()) { 1970 SemaRef.Diag(Constructor->getLocation(), 1971 diag::err_uninitialized_member_in_ctor) 1972 << (int)Constructor->isImplicit() 1973 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1974 << 1 << Field->getDeclName(); 1975 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1976 return true; 1977 } 1978 1979 // Nothing to initialize. 1980 CXXMemberInit = 0; 1981 return false; 1982} 1983 1984namespace { 1985struct BaseAndFieldInfo { 1986 Sema &S; 1987 CXXConstructorDecl *Ctor; 1988 bool AnyErrorsInInits; 1989 ImplicitInitializerKind IIK; 1990 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1991 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1992 1993 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1994 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1995 // FIXME: Handle implicit move constructors. 1996 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1997 IIK = IIK_Copy; 1998 else 1999 IIK = IIK_Default; 2000 } 2001}; 2002} 2003 2004static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2005 FieldDecl *Top, FieldDecl *Field) { 2006 2007 // Overwhelmingly common case: we have a direct initializer for this field. 2008 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2009 Info.AllToInit.push_back(Init); 2010 return false; 2011 } 2012 2013 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2014 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2015 assert(FieldClassType && "anonymous struct/union without record type"); 2016 CXXRecordDecl *FieldClassDecl 2017 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2018 2019 // Even though union members never have non-trivial default 2020 // constructions in C++03, we still build member initializers for aggregate 2021 // record types which can be union members, and C++0x allows non-trivial 2022 // default constructors for union members, so we ensure that only one 2023 // member is initialized for these. 2024 if (FieldClassDecl->isUnion()) { 2025 // First check for an explicit initializer for one field. 2026 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2027 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2028 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2029 Info.AllToInit.push_back(Init); 2030 2031 // Once we've initialized a field of an anonymous union, the union 2032 // field in the class is also initialized, so exit immediately. 2033 return false; 2034 } else if ((*FA)->isAnonymousStructOrUnion()) { 2035 if (CollectFieldInitializer(Info, Top, *FA)) 2036 return true; 2037 } 2038 } 2039 2040 // Fallthrough and construct a default initializer for the union as 2041 // a whole, which can call its default constructor if such a thing exists 2042 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2043 // behavior going forward with C++0x, when anonymous unions there are 2044 // finalized, we should revisit this. 2045 } else { 2046 // For structs, we simply descend through to initialize all members where 2047 // necessary. 2048 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2049 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2050 if (CollectFieldInitializer(Info, Top, *FA)) 2051 return true; 2052 } 2053 } 2054 } 2055 2056 // Don't try to build an implicit initializer if there were semantic 2057 // errors in any of the initializers (and therefore we might be 2058 // missing some that the user actually wrote). 2059 if (Info.AnyErrorsInInits) 2060 return false; 2061 2062 CXXCtorInitializer *Init = 0; 2063 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2064 return true; 2065 2066 if (Init) 2067 Info.AllToInit.push_back(Init); 2068 2069 return false; 2070} 2071 2072bool 2073Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2074 CXXCtorInitializer *Initializer) { 2075 CXXConstructorDecl *Target = Initializer->getTargetConstructor(); 2076 CXXConstructorDecl *Canonical = Constructor->getCanonicalDecl(); 2077 while (Target) { 2078 if (Target->getCanonicalDecl() == Canonical) { 2079 Diag(Initializer->getSourceLocation(), diag::err_delegating_ctor_loop) 2080 << Constructor; 2081 return true; 2082 } 2083 Target = Target->getTargetConstructor(); 2084 } 2085 2086 // We do the cycle detection first so that we know that we're not 2087 // going to create a cycle by inserting this link. This ensures that 2088 // the AST is cycle-free and we don't get a scenario where we have 2089 // a B -> C -> B cycle and then add an A -> B link and get stuck in 2090 // an infinite loop as we check for cycles with A and never get there 2091 // because we get stuck in a cycle not including A. 2092 Constructor->setNumCtorInitializers(1); 2093 CXXCtorInitializer **initializer = 2094 new (Context) CXXCtorInitializer*[1]; 2095 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2096 Constructor->setCtorInitializers(initializer); 2097 2098 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2099 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2100 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2101 } 2102 2103 return false; 2104} 2105 2106 2107bool 2108Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2109 CXXCtorInitializer **Initializers, 2110 unsigned NumInitializers, 2111 bool AnyErrors) { 2112 if (Constructor->getDeclContext()->isDependentContext()) { 2113 // Just store the initializers as written, they will be checked during 2114 // instantiation. 2115 if (NumInitializers > 0) { 2116 Constructor->setNumCtorInitializers(NumInitializers); 2117 CXXCtorInitializer **baseOrMemberInitializers = 2118 new (Context) CXXCtorInitializer*[NumInitializers]; 2119 memcpy(baseOrMemberInitializers, Initializers, 2120 NumInitializers * sizeof(CXXCtorInitializer*)); 2121 Constructor->setCtorInitializers(baseOrMemberInitializers); 2122 } 2123 2124 return false; 2125 } 2126 2127 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2128 2129 // We need to build the initializer AST according to order of construction 2130 // and not what user specified in the Initializers list. 2131 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2132 if (!ClassDecl) 2133 return true; 2134 2135 bool HadError = false; 2136 2137 for (unsigned i = 0; i < NumInitializers; i++) { 2138 CXXCtorInitializer *Member = Initializers[i]; 2139 2140 if (Member->isBaseInitializer()) 2141 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2142 else 2143 Info.AllBaseFields[Member->getAnyMember()] = Member; 2144 } 2145 2146 // Keep track of the direct virtual bases. 2147 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2148 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2149 E = ClassDecl->bases_end(); I != E; ++I) { 2150 if (I->isVirtual()) 2151 DirectVBases.insert(I); 2152 } 2153 2154 // Push virtual bases before others. 2155 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2156 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2157 2158 if (CXXCtorInitializer *Value 2159 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2160 Info.AllToInit.push_back(Value); 2161 } else if (!AnyErrors) { 2162 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2163 CXXCtorInitializer *CXXBaseInit; 2164 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2165 VBase, IsInheritedVirtualBase, 2166 CXXBaseInit)) { 2167 HadError = true; 2168 continue; 2169 } 2170 2171 Info.AllToInit.push_back(CXXBaseInit); 2172 } 2173 } 2174 2175 // Non-virtual bases. 2176 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2177 E = ClassDecl->bases_end(); Base != E; ++Base) { 2178 // Virtuals are in the virtual base list and already constructed. 2179 if (Base->isVirtual()) 2180 continue; 2181 2182 if (CXXCtorInitializer *Value 2183 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2184 Info.AllToInit.push_back(Value); 2185 } else if (!AnyErrors) { 2186 CXXCtorInitializer *CXXBaseInit; 2187 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2188 Base, /*IsInheritedVirtualBase=*/false, 2189 CXXBaseInit)) { 2190 HadError = true; 2191 continue; 2192 } 2193 2194 Info.AllToInit.push_back(CXXBaseInit); 2195 } 2196 } 2197 2198 // Fields. 2199 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2200 E = ClassDecl->field_end(); Field != E; ++Field) { 2201 if ((*Field)->getType()->isIncompleteArrayType()) { 2202 assert(ClassDecl->hasFlexibleArrayMember() && 2203 "Incomplete array type is not valid"); 2204 continue; 2205 } 2206 if (CollectFieldInitializer(Info, *Field, *Field)) 2207 HadError = true; 2208 } 2209 2210 NumInitializers = Info.AllToInit.size(); 2211 if (NumInitializers > 0) { 2212 Constructor->setNumCtorInitializers(NumInitializers); 2213 CXXCtorInitializer **baseOrMemberInitializers = 2214 new (Context) CXXCtorInitializer*[NumInitializers]; 2215 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2216 NumInitializers * sizeof(CXXCtorInitializer*)); 2217 Constructor->setCtorInitializers(baseOrMemberInitializers); 2218 2219 // Constructors implicitly reference the base and member 2220 // destructors. 2221 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2222 Constructor->getParent()); 2223 } 2224 2225 return HadError; 2226} 2227 2228static void *GetKeyForTopLevelField(FieldDecl *Field) { 2229 // For anonymous unions, use the class declaration as the key. 2230 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2231 if (RT->getDecl()->isAnonymousStructOrUnion()) 2232 return static_cast<void *>(RT->getDecl()); 2233 } 2234 return static_cast<void *>(Field); 2235} 2236 2237static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2238 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2239} 2240 2241static void *GetKeyForMember(ASTContext &Context, 2242 CXXCtorInitializer *Member) { 2243 if (!Member->isAnyMemberInitializer()) 2244 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2245 2246 // For fields injected into the class via declaration of an anonymous union, 2247 // use its anonymous union class declaration as the unique key. 2248 FieldDecl *Field = Member->getAnyMember(); 2249 2250 // If the field is a member of an anonymous struct or union, our key 2251 // is the anonymous record decl that's a direct child of the class. 2252 RecordDecl *RD = Field->getParent(); 2253 if (RD->isAnonymousStructOrUnion()) { 2254 while (true) { 2255 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2256 if (Parent->isAnonymousStructOrUnion()) 2257 RD = Parent; 2258 else 2259 break; 2260 } 2261 2262 return static_cast<void *>(RD); 2263 } 2264 2265 return static_cast<void *>(Field); 2266} 2267 2268static void 2269DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2270 const CXXConstructorDecl *Constructor, 2271 CXXCtorInitializer **Inits, 2272 unsigned NumInits) { 2273 if (Constructor->getDeclContext()->isDependentContext()) 2274 return; 2275 2276 // Don't check initializers order unless the warning is enabled at the 2277 // location of at least one initializer. 2278 bool ShouldCheckOrder = false; 2279 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2280 CXXCtorInitializer *Init = Inits[InitIndex]; 2281 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2282 Init->getSourceLocation()) 2283 != Diagnostic::Ignored) { 2284 ShouldCheckOrder = true; 2285 break; 2286 } 2287 } 2288 if (!ShouldCheckOrder) 2289 return; 2290 2291 // Build the list of bases and members in the order that they'll 2292 // actually be initialized. The explicit initializers should be in 2293 // this same order but may be missing things. 2294 llvm::SmallVector<const void*, 32> IdealInitKeys; 2295 2296 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2297 2298 // 1. Virtual bases. 2299 for (CXXRecordDecl::base_class_const_iterator VBase = 2300 ClassDecl->vbases_begin(), 2301 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2302 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2303 2304 // 2. Non-virtual bases. 2305 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2306 E = ClassDecl->bases_end(); Base != E; ++Base) { 2307 if (Base->isVirtual()) 2308 continue; 2309 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2310 } 2311 2312 // 3. Direct fields. 2313 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2314 E = ClassDecl->field_end(); Field != E; ++Field) 2315 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2316 2317 unsigned NumIdealInits = IdealInitKeys.size(); 2318 unsigned IdealIndex = 0; 2319 2320 CXXCtorInitializer *PrevInit = 0; 2321 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2322 CXXCtorInitializer *Init = Inits[InitIndex]; 2323 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2324 2325 // Scan forward to try to find this initializer in the idealized 2326 // initializers list. 2327 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2328 if (InitKey == IdealInitKeys[IdealIndex]) 2329 break; 2330 2331 // If we didn't find this initializer, it must be because we 2332 // scanned past it on a previous iteration. That can only 2333 // happen if we're out of order; emit a warning. 2334 if (IdealIndex == NumIdealInits && PrevInit) { 2335 Sema::SemaDiagnosticBuilder D = 2336 SemaRef.Diag(PrevInit->getSourceLocation(), 2337 diag::warn_initializer_out_of_order); 2338 2339 if (PrevInit->isAnyMemberInitializer()) 2340 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2341 else 2342 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2343 2344 if (Init->isAnyMemberInitializer()) 2345 D << 0 << Init->getAnyMember()->getDeclName(); 2346 else 2347 D << 1 << Init->getBaseClassInfo()->getType(); 2348 2349 // Move back to the initializer's location in the ideal list. 2350 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2351 if (InitKey == IdealInitKeys[IdealIndex]) 2352 break; 2353 2354 assert(IdealIndex != NumIdealInits && 2355 "initializer not found in initializer list"); 2356 } 2357 2358 PrevInit = Init; 2359 } 2360} 2361 2362namespace { 2363bool CheckRedundantInit(Sema &S, 2364 CXXCtorInitializer *Init, 2365 CXXCtorInitializer *&PrevInit) { 2366 if (!PrevInit) { 2367 PrevInit = Init; 2368 return false; 2369 } 2370 2371 if (FieldDecl *Field = Init->getMember()) 2372 S.Diag(Init->getSourceLocation(), 2373 diag::err_multiple_mem_initialization) 2374 << Field->getDeclName() 2375 << Init->getSourceRange(); 2376 else { 2377 const Type *BaseClass = Init->getBaseClass(); 2378 assert(BaseClass && "neither field nor base"); 2379 S.Diag(Init->getSourceLocation(), 2380 diag::err_multiple_base_initialization) 2381 << QualType(BaseClass, 0) 2382 << Init->getSourceRange(); 2383 } 2384 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2385 << 0 << PrevInit->getSourceRange(); 2386 2387 return true; 2388} 2389 2390typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2391typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2392 2393bool CheckRedundantUnionInit(Sema &S, 2394 CXXCtorInitializer *Init, 2395 RedundantUnionMap &Unions) { 2396 FieldDecl *Field = Init->getAnyMember(); 2397 RecordDecl *Parent = Field->getParent(); 2398 if (!Parent->isAnonymousStructOrUnion()) 2399 return false; 2400 2401 NamedDecl *Child = Field; 2402 do { 2403 if (Parent->isUnion()) { 2404 UnionEntry &En = Unions[Parent]; 2405 if (En.first && En.first != Child) { 2406 S.Diag(Init->getSourceLocation(), 2407 diag::err_multiple_mem_union_initialization) 2408 << Field->getDeclName() 2409 << Init->getSourceRange(); 2410 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2411 << 0 << En.second->getSourceRange(); 2412 return true; 2413 } else if (!En.first) { 2414 En.first = Child; 2415 En.second = Init; 2416 } 2417 } 2418 2419 Child = Parent; 2420 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2421 } while (Parent->isAnonymousStructOrUnion()); 2422 2423 return false; 2424} 2425} 2426 2427/// ActOnMemInitializers - Handle the member initializers for a constructor. 2428void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2429 SourceLocation ColonLoc, 2430 MemInitTy **meminits, unsigned NumMemInits, 2431 bool AnyErrors) { 2432 if (!ConstructorDecl) 2433 return; 2434 2435 AdjustDeclIfTemplate(ConstructorDecl); 2436 2437 CXXConstructorDecl *Constructor 2438 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2439 2440 if (!Constructor) { 2441 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2442 return; 2443 } 2444 2445 CXXCtorInitializer **MemInits = 2446 reinterpret_cast<CXXCtorInitializer **>(meminits); 2447 2448 // Mapping for the duplicate initializers check. 2449 // For member initializers, this is keyed with a FieldDecl*. 2450 // For base initializers, this is keyed with a Type*. 2451 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2452 2453 // Mapping for the inconsistent anonymous-union initializers check. 2454 RedundantUnionMap MemberUnions; 2455 2456 bool HadError = false; 2457 for (unsigned i = 0; i < NumMemInits; i++) { 2458 CXXCtorInitializer *Init = MemInits[i]; 2459 2460 // Set the source order index. 2461 Init->setSourceOrder(i); 2462 2463 if (Init->isAnyMemberInitializer()) { 2464 FieldDecl *Field = Init->getAnyMember(); 2465 if (CheckRedundantInit(*this, Init, Members[Field]) || 2466 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2467 HadError = true; 2468 } else if (Init->isBaseInitializer()) { 2469 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2470 if (CheckRedundantInit(*this, Init, Members[Key])) 2471 HadError = true; 2472 } else { 2473 assert(Init->isDelegatingInitializer()); 2474 // This must be the only initializer 2475 if (i != 0 || NumMemInits > 1) { 2476 Diag(MemInits[0]->getSourceLocation(), 2477 diag::err_delegating_initializer_alone) 2478 << MemInits[0]->getSourceRange(); 2479 HadError = true; 2480 // We will treat this as being the only initializer. 2481 } 2482 SetDelegatingInitializer(Constructor, *MemInits); 2483 // Return immediately as the initializer is set. 2484 return; 2485 } 2486 } 2487 2488 if (HadError) 2489 return; 2490 2491 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2492 2493 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2494} 2495 2496void 2497Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2498 CXXRecordDecl *ClassDecl) { 2499 // Ignore dependent contexts. 2500 if (ClassDecl->isDependentContext()) 2501 return; 2502 2503 // FIXME: all the access-control diagnostics are positioned on the 2504 // field/base declaration. That's probably good; that said, the 2505 // user might reasonably want to know why the destructor is being 2506 // emitted, and we currently don't say. 2507 2508 // Non-static data members. 2509 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2510 E = ClassDecl->field_end(); I != E; ++I) { 2511 FieldDecl *Field = *I; 2512 if (Field->isInvalidDecl()) 2513 continue; 2514 QualType FieldType = Context.getBaseElementType(Field->getType()); 2515 2516 const RecordType* RT = FieldType->getAs<RecordType>(); 2517 if (!RT) 2518 continue; 2519 2520 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2521 if (FieldClassDecl->isInvalidDecl()) 2522 continue; 2523 if (FieldClassDecl->hasTrivialDestructor()) 2524 continue; 2525 2526 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2527 assert(Dtor && "No dtor found for FieldClassDecl!"); 2528 CheckDestructorAccess(Field->getLocation(), Dtor, 2529 PDiag(diag::err_access_dtor_field) 2530 << Field->getDeclName() 2531 << FieldType); 2532 2533 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2534 } 2535 2536 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2537 2538 // Bases. 2539 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2540 E = ClassDecl->bases_end(); Base != E; ++Base) { 2541 // Bases are always records in a well-formed non-dependent class. 2542 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2543 2544 // Remember direct virtual bases. 2545 if (Base->isVirtual()) 2546 DirectVirtualBases.insert(RT); 2547 2548 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2549 // If our base class is invalid, we probably can't get its dtor anyway. 2550 if (BaseClassDecl->isInvalidDecl()) 2551 continue; 2552 // Ignore trivial destructors. 2553 if (BaseClassDecl->hasTrivialDestructor()) 2554 continue; 2555 2556 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2557 assert(Dtor && "No dtor found for BaseClassDecl!"); 2558 2559 // FIXME: caret should be on the start of the class name 2560 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2561 PDiag(diag::err_access_dtor_base) 2562 << Base->getType() 2563 << Base->getSourceRange()); 2564 2565 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2566 } 2567 2568 // Virtual bases. 2569 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2570 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2571 2572 // Bases are always records in a well-formed non-dependent class. 2573 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2574 2575 // Ignore direct virtual bases. 2576 if (DirectVirtualBases.count(RT)) 2577 continue; 2578 2579 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2580 // If our base class is invalid, we probably can't get its dtor anyway. 2581 if (BaseClassDecl->isInvalidDecl()) 2582 continue; 2583 // Ignore trivial destructors. 2584 if (BaseClassDecl->hasTrivialDestructor()) 2585 continue; 2586 2587 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2588 assert(Dtor && "No dtor found for BaseClassDecl!"); 2589 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2590 PDiag(diag::err_access_dtor_vbase) 2591 << VBase->getType()); 2592 2593 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2594 } 2595} 2596 2597void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2598 if (!CDtorDecl) 2599 return; 2600 2601 if (CXXConstructorDecl *Constructor 2602 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2603 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2604} 2605 2606bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2607 unsigned DiagID, AbstractDiagSelID SelID) { 2608 if (SelID == -1) 2609 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2610 else 2611 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2612} 2613 2614bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2615 const PartialDiagnostic &PD) { 2616 if (!getLangOptions().CPlusPlus) 2617 return false; 2618 2619 if (const ArrayType *AT = Context.getAsArrayType(T)) 2620 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2621 2622 if (const PointerType *PT = T->getAs<PointerType>()) { 2623 // Find the innermost pointer type. 2624 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2625 PT = T; 2626 2627 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2628 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2629 } 2630 2631 const RecordType *RT = T->getAs<RecordType>(); 2632 if (!RT) 2633 return false; 2634 2635 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2636 2637 // We can't answer whether something is abstract until it has a 2638 // definition. If it's currently being defined, we'll walk back 2639 // over all the declarations when we have a full definition. 2640 const CXXRecordDecl *Def = RD->getDefinition(); 2641 if (!Def || Def->isBeingDefined()) 2642 return false; 2643 2644 if (!RD->isAbstract()) 2645 return false; 2646 2647 Diag(Loc, PD) << RD->getDeclName(); 2648 DiagnoseAbstractType(RD); 2649 2650 return true; 2651} 2652 2653void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2654 // Check if we've already emitted the list of pure virtual functions 2655 // for this class. 2656 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2657 return; 2658 2659 CXXFinalOverriderMap FinalOverriders; 2660 RD->getFinalOverriders(FinalOverriders); 2661 2662 // Keep a set of seen pure methods so we won't diagnose the same method 2663 // more than once. 2664 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2665 2666 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2667 MEnd = FinalOverriders.end(); 2668 M != MEnd; 2669 ++M) { 2670 for (OverridingMethods::iterator SO = M->second.begin(), 2671 SOEnd = M->second.end(); 2672 SO != SOEnd; ++SO) { 2673 // C++ [class.abstract]p4: 2674 // A class is abstract if it contains or inherits at least one 2675 // pure virtual function for which the final overrider is pure 2676 // virtual. 2677 2678 // 2679 if (SO->second.size() != 1) 2680 continue; 2681 2682 if (!SO->second.front().Method->isPure()) 2683 continue; 2684 2685 if (!SeenPureMethods.insert(SO->second.front().Method)) 2686 continue; 2687 2688 Diag(SO->second.front().Method->getLocation(), 2689 diag::note_pure_virtual_function) 2690 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2691 } 2692 } 2693 2694 if (!PureVirtualClassDiagSet) 2695 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2696 PureVirtualClassDiagSet->insert(RD); 2697} 2698 2699namespace { 2700struct AbstractUsageInfo { 2701 Sema &S; 2702 CXXRecordDecl *Record; 2703 CanQualType AbstractType; 2704 bool Invalid; 2705 2706 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2707 : S(S), Record(Record), 2708 AbstractType(S.Context.getCanonicalType( 2709 S.Context.getTypeDeclType(Record))), 2710 Invalid(false) {} 2711 2712 void DiagnoseAbstractType() { 2713 if (Invalid) return; 2714 S.DiagnoseAbstractType(Record); 2715 Invalid = true; 2716 } 2717 2718 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2719}; 2720 2721struct CheckAbstractUsage { 2722 AbstractUsageInfo &Info; 2723 const NamedDecl *Ctx; 2724 2725 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2726 : Info(Info), Ctx(Ctx) {} 2727 2728 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2729 switch (TL.getTypeLocClass()) { 2730#define ABSTRACT_TYPELOC(CLASS, PARENT) 2731#define TYPELOC(CLASS, PARENT) \ 2732 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2733#include "clang/AST/TypeLocNodes.def" 2734 } 2735 } 2736 2737 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2738 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2739 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2740 if (!TL.getArg(I)) 2741 continue; 2742 2743 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2744 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2745 } 2746 } 2747 2748 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2749 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2750 } 2751 2752 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2753 // Visit the type parameters from a permissive context. 2754 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2755 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2756 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2757 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2758 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2759 // TODO: other template argument types? 2760 } 2761 } 2762 2763 // Visit pointee types from a permissive context. 2764#define CheckPolymorphic(Type) \ 2765 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2766 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2767 } 2768 CheckPolymorphic(PointerTypeLoc) 2769 CheckPolymorphic(ReferenceTypeLoc) 2770 CheckPolymorphic(MemberPointerTypeLoc) 2771 CheckPolymorphic(BlockPointerTypeLoc) 2772 2773 /// Handle all the types we haven't given a more specific 2774 /// implementation for above. 2775 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2776 // Every other kind of type that we haven't called out already 2777 // that has an inner type is either (1) sugar or (2) contains that 2778 // inner type in some way as a subobject. 2779 if (TypeLoc Next = TL.getNextTypeLoc()) 2780 return Visit(Next, Sel); 2781 2782 // If there's no inner type and we're in a permissive context, 2783 // don't diagnose. 2784 if (Sel == Sema::AbstractNone) return; 2785 2786 // Check whether the type matches the abstract type. 2787 QualType T = TL.getType(); 2788 if (T->isArrayType()) { 2789 Sel = Sema::AbstractArrayType; 2790 T = Info.S.Context.getBaseElementType(T); 2791 } 2792 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2793 if (CT != Info.AbstractType) return; 2794 2795 // It matched; do some magic. 2796 if (Sel == Sema::AbstractArrayType) { 2797 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2798 << T << TL.getSourceRange(); 2799 } else { 2800 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2801 << Sel << T << TL.getSourceRange(); 2802 } 2803 Info.DiagnoseAbstractType(); 2804 } 2805}; 2806 2807void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2808 Sema::AbstractDiagSelID Sel) { 2809 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2810} 2811 2812} 2813 2814/// Check for invalid uses of an abstract type in a method declaration. 2815static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2816 CXXMethodDecl *MD) { 2817 // No need to do the check on definitions, which require that 2818 // the return/param types be complete. 2819 if (MD->isThisDeclarationADefinition()) 2820 return; 2821 2822 // For safety's sake, just ignore it if we don't have type source 2823 // information. This should never happen for non-implicit methods, 2824 // but... 2825 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2826 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2827} 2828 2829/// Check for invalid uses of an abstract type within a class definition. 2830static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2831 CXXRecordDecl *RD) { 2832 for (CXXRecordDecl::decl_iterator 2833 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2834 Decl *D = *I; 2835 if (D->isImplicit()) continue; 2836 2837 // Methods and method templates. 2838 if (isa<CXXMethodDecl>(D)) { 2839 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2840 } else if (isa<FunctionTemplateDecl>(D)) { 2841 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2842 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2843 2844 // Fields and static variables. 2845 } else if (isa<FieldDecl>(D)) { 2846 FieldDecl *FD = cast<FieldDecl>(D); 2847 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2848 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2849 } else if (isa<VarDecl>(D)) { 2850 VarDecl *VD = cast<VarDecl>(D); 2851 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2852 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2853 2854 // Nested classes and class templates. 2855 } else if (isa<CXXRecordDecl>(D)) { 2856 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2857 } else if (isa<ClassTemplateDecl>(D)) { 2858 CheckAbstractClassUsage(Info, 2859 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2860 } 2861 } 2862} 2863 2864/// \brief Perform semantic checks on a class definition that has been 2865/// completing, introducing implicitly-declared members, checking for 2866/// abstract types, etc. 2867void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2868 if (!Record) 2869 return; 2870 2871 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2872 AbstractUsageInfo Info(*this, Record); 2873 CheckAbstractClassUsage(Info, Record); 2874 } 2875 2876 // If this is not an aggregate type and has no user-declared constructor, 2877 // complain about any non-static data members of reference or const scalar 2878 // type, since they will never get initializers. 2879 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2880 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2881 bool Complained = false; 2882 for (RecordDecl::field_iterator F = Record->field_begin(), 2883 FEnd = Record->field_end(); 2884 F != FEnd; ++F) { 2885 if (F->getType()->isReferenceType() || 2886 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2887 if (!Complained) { 2888 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2889 << Record->getTagKind() << Record; 2890 Complained = true; 2891 } 2892 2893 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2894 << F->getType()->isReferenceType() 2895 << F->getDeclName(); 2896 } 2897 } 2898 } 2899 2900 if (Record->isDynamicClass() && !Record->isDependentType()) 2901 DynamicClasses.push_back(Record); 2902 2903 if (Record->getIdentifier()) { 2904 // C++ [class.mem]p13: 2905 // If T is the name of a class, then each of the following shall have a 2906 // name different from T: 2907 // - every member of every anonymous union that is a member of class T. 2908 // 2909 // C++ [class.mem]p14: 2910 // In addition, if class T has a user-declared constructor (12.1), every 2911 // non-static data member of class T shall have a name different from T. 2912 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2913 R.first != R.second; ++R.first) { 2914 NamedDecl *D = *R.first; 2915 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2916 isa<IndirectFieldDecl>(D)) { 2917 Diag(D->getLocation(), diag::err_member_name_of_class) 2918 << D->getDeclName(); 2919 break; 2920 } 2921 } 2922 } 2923 2924 // Warn if the class has virtual methods but non-virtual public destructor. 2925 if (Record->isPolymorphic() && !Record->isDependentType()) { 2926 CXXDestructorDecl *dtor = Record->getDestructor(); 2927 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2928 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2929 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2930 } 2931 2932 // See if a method overloads virtual methods in a base 2933 /// class without overriding any. 2934 if (!Record->isDependentType()) { 2935 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2936 MEnd = Record->method_end(); 2937 M != MEnd; ++M) { 2938 if (!(*M)->isStatic()) 2939 DiagnoseHiddenVirtualMethods(Record, *M); 2940 } 2941 } 2942 2943 // Declare inherited constructors. We do this eagerly here because: 2944 // - The standard requires an eager diagnostic for conflicting inherited 2945 // constructors from different classes. 2946 // - The lazy declaration of the other implicit constructors is so as to not 2947 // waste space and performance on classes that are not meant to be 2948 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2949 // have inherited constructors. 2950 DeclareInheritedConstructors(Record); 2951} 2952 2953/// \brief Data used with FindHiddenVirtualMethod 2954namespace { 2955 struct FindHiddenVirtualMethodData { 2956 Sema *S; 2957 CXXMethodDecl *Method; 2958 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2959 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2960 }; 2961} 2962 2963/// \brief Member lookup function that determines whether a given C++ 2964/// method overloads virtual methods in a base class without overriding any, 2965/// to be used with CXXRecordDecl::lookupInBases(). 2966static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2967 CXXBasePath &Path, 2968 void *UserData) { 2969 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2970 2971 FindHiddenVirtualMethodData &Data 2972 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2973 2974 DeclarationName Name = Data.Method->getDeclName(); 2975 assert(Name.getNameKind() == DeclarationName::Identifier); 2976 2977 bool foundSameNameMethod = false; 2978 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2979 for (Path.Decls = BaseRecord->lookup(Name); 2980 Path.Decls.first != Path.Decls.second; 2981 ++Path.Decls.first) { 2982 NamedDecl *D = *Path.Decls.first; 2983 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2984 MD = MD->getCanonicalDecl(); 2985 foundSameNameMethod = true; 2986 // Interested only in hidden virtual methods. 2987 if (!MD->isVirtual()) 2988 continue; 2989 // If the method we are checking overrides a method from its base 2990 // don't warn about the other overloaded methods. 2991 if (!Data.S->IsOverload(Data.Method, MD, false)) 2992 return true; 2993 // Collect the overload only if its hidden. 2994 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2995 overloadedMethods.push_back(MD); 2996 } 2997 } 2998 2999 if (foundSameNameMethod) 3000 Data.OverloadedMethods.append(overloadedMethods.begin(), 3001 overloadedMethods.end()); 3002 return foundSameNameMethod; 3003} 3004 3005/// \brief See if a method overloads virtual methods in a base class without 3006/// overriding any. 3007void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3008 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 3009 MD->getLocation()) == Diagnostic::Ignored) 3010 return; 3011 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 3012 return; 3013 3014 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3015 /*bool RecordPaths=*/false, 3016 /*bool DetectVirtual=*/false); 3017 FindHiddenVirtualMethodData Data; 3018 Data.Method = MD; 3019 Data.S = this; 3020 3021 // Keep the base methods that were overriden or introduced in the subclass 3022 // by 'using' in a set. A base method not in this set is hidden. 3023 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3024 res.first != res.second; ++res.first) { 3025 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3026 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3027 E = MD->end_overridden_methods(); 3028 I != E; ++I) 3029 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3030 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3031 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3032 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3033 } 3034 3035 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3036 !Data.OverloadedMethods.empty()) { 3037 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3038 << MD << (Data.OverloadedMethods.size() > 1); 3039 3040 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3041 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3042 Diag(overloadedMD->getLocation(), 3043 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3044 } 3045 } 3046} 3047 3048void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3049 Decl *TagDecl, 3050 SourceLocation LBrac, 3051 SourceLocation RBrac, 3052 AttributeList *AttrList) { 3053 if (!TagDecl) 3054 return; 3055 3056 AdjustDeclIfTemplate(TagDecl); 3057 3058 ActOnFields(S, RLoc, TagDecl, 3059 // strict aliasing violation! 3060 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3061 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3062 3063 CheckCompletedCXXClass( 3064 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3065} 3066 3067namespace { 3068 /// \brief Helper class that collects exception specifications for 3069 /// implicitly-declared special member functions. 3070 class ImplicitExceptionSpecification { 3071 ASTContext &Context; 3072 // We order exception specifications thus: 3073 // noexcept is the most restrictive, but is only used in C++0x. 3074 // throw() comes next. 3075 // Then a throw(collected exceptions) 3076 // Finally no specification. 3077 // throw(...) is used instead if any called function uses it. 3078 ExceptionSpecificationType ComputedEST; 3079 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3080 llvm::SmallVector<QualType, 4> Exceptions; 3081 3082 void ClearExceptions() { 3083 ExceptionsSeen.clear(); 3084 Exceptions.clear(); 3085 } 3086 3087 public: 3088 explicit ImplicitExceptionSpecification(ASTContext &Context) 3089 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3090 if (!Context.getLangOptions().CPlusPlus0x) 3091 ComputedEST = EST_DynamicNone; 3092 } 3093 3094 /// \brief Get the computed exception specification type. 3095 ExceptionSpecificationType getExceptionSpecType() const { 3096 assert(ComputedEST != EST_ComputedNoexcept && 3097 "noexcept(expr) should not be a possible result"); 3098 return ComputedEST; 3099 } 3100 3101 /// \brief The number of exceptions in the exception specification. 3102 unsigned size() const { return Exceptions.size(); } 3103 3104 /// \brief The set of exceptions in the exception specification. 3105 const QualType *data() const { return Exceptions.data(); } 3106 3107 /// \brief Integrate another called method into the collected data. 3108 void CalledDecl(CXXMethodDecl *Method) { 3109 // If we have an MSAny spec already, don't bother. 3110 if (!Method || ComputedEST == EST_MSAny) 3111 return; 3112 3113 const FunctionProtoType *Proto 3114 = Method->getType()->getAs<FunctionProtoType>(); 3115 3116 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3117 3118 // If this function can throw any exceptions, make a note of that. 3119 if (EST == EST_MSAny || EST == EST_None) { 3120 ClearExceptions(); 3121 ComputedEST = EST; 3122 return; 3123 } 3124 3125 // If this function has a basic noexcept, it doesn't affect the outcome. 3126 if (EST == EST_BasicNoexcept) 3127 return; 3128 3129 // If we have a throw-all spec at this point, ignore the function. 3130 if (ComputedEST == EST_None) 3131 return; 3132 3133 // If we're still at noexcept(true) and there's a nothrow() callee, 3134 // change to that specification. 3135 if (EST == EST_DynamicNone) { 3136 if (ComputedEST == EST_BasicNoexcept) 3137 ComputedEST = EST_DynamicNone; 3138 return; 3139 } 3140 3141 // Check out noexcept specs. 3142 if (EST == EST_ComputedNoexcept) { 3143 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3144 assert(NR != FunctionProtoType::NR_NoNoexcept && 3145 "Must have noexcept result for EST_ComputedNoexcept."); 3146 assert(NR != FunctionProtoType::NR_Dependent && 3147 "Should not generate implicit declarations for dependent cases, " 3148 "and don't know how to handle them anyway."); 3149 3150 // noexcept(false) -> no spec on the new function 3151 if (NR == FunctionProtoType::NR_Throw) { 3152 ClearExceptions(); 3153 ComputedEST = EST_None; 3154 } 3155 // noexcept(true) won't change anything either. 3156 return; 3157 } 3158 3159 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3160 assert(ComputedEST != EST_None && 3161 "Shouldn't collect exceptions when throw-all is guaranteed."); 3162 ComputedEST = EST_Dynamic; 3163 // Record the exceptions in this function's exception specification. 3164 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3165 EEnd = Proto->exception_end(); 3166 E != EEnd; ++E) 3167 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3168 Exceptions.push_back(*E); 3169 } 3170 }; 3171} 3172 3173 3174/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3175/// special functions, such as the default constructor, copy 3176/// constructor, or destructor, to the given C++ class (C++ 3177/// [special]p1). This routine can only be executed just before the 3178/// definition of the class is complete. 3179void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3180 if (!ClassDecl->hasUserDeclaredConstructor()) 3181 ++ASTContext::NumImplicitDefaultConstructors; 3182 3183 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3184 ++ASTContext::NumImplicitCopyConstructors; 3185 3186 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3187 ++ASTContext::NumImplicitCopyAssignmentOperators; 3188 3189 // If we have a dynamic class, then the copy assignment operator may be 3190 // virtual, so we have to declare it immediately. This ensures that, e.g., 3191 // it shows up in the right place in the vtable and that we diagnose 3192 // problems with the implicit exception specification. 3193 if (ClassDecl->isDynamicClass()) 3194 DeclareImplicitCopyAssignment(ClassDecl); 3195 } 3196 3197 if (!ClassDecl->hasUserDeclaredDestructor()) { 3198 ++ASTContext::NumImplicitDestructors; 3199 3200 // If we have a dynamic class, then the destructor may be virtual, so we 3201 // have to declare the destructor immediately. This ensures that, e.g., it 3202 // shows up in the right place in the vtable and that we diagnose problems 3203 // with the implicit exception specification. 3204 if (ClassDecl->isDynamicClass()) 3205 DeclareImplicitDestructor(ClassDecl); 3206 } 3207} 3208 3209void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3210 if (!D) 3211 return; 3212 3213 int NumParamList = D->getNumTemplateParameterLists(); 3214 for (int i = 0; i < NumParamList; i++) { 3215 TemplateParameterList* Params = D->getTemplateParameterList(i); 3216 for (TemplateParameterList::iterator Param = Params->begin(), 3217 ParamEnd = Params->end(); 3218 Param != ParamEnd; ++Param) { 3219 NamedDecl *Named = cast<NamedDecl>(*Param); 3220 if (Named->getDeclName()) { 3221 S->AddDecl(Named); 3222 IdResolver.AddDecl(Named); 3223 } 3224 } 3225 } 3226} 3227 3228void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3229 if (!D) 3230 return; 3231 3232 TemplateParameterList *Params = 0; 3233 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3234 Params = Template->getTemplateParameters(); 3235 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3236 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3237 Params = PartialSpec->getTemplateParameters(); 3238 else 3239 return; 3240 3241 for (TemplateParameterList::iterator Param = Params->begin(), 3242 ParamEnd = Params->end(); 3243 Param != ParamEnd; ++Param) { 3244 NamedDecl *Named = cast<NamedDecl>(*Param); 3245 if (Named->getDeclName()) { 3246 S->AddDecl(Named); 3247 IdResolver.AddDecl(Named); 3248 } 3249 } 3250} 3251 3252void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3253 if (!RecordD) return; 3254 AdjustDeclIfTemplate(RecordD); 3255 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3256 PushDeclContext(S, Record); 3257} 3258 3259void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3260 if (!RecordD) return; 3261 PopDeclContext(); 3262} 3263 3264/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3265/// parsing a top-level (non-nested) C++ class, and we are now 3266/// parsing those parts of the given Method declaration that could 3267/// not be parsed earlier (C++ [class.mem]p2), such as default 3268/// arguments. This action should enter the scope of the given 3269/// Method declaration as if we had just parsed the qualified method 3270/// name. However, it should not bring the parameters into scope; 3271/// that will be performed by ActOnDelayedCXXMethodParameter. 3272void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3273} 3274 3275/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3276/// C++ method declaration. We're (re-)introducing the given 3277/// function parameter into scope for use in parsing later parts of 3278/// the method declaration. For example, we could see an 3279/// ActOnParamDefaultArgument event for this parameter. 3280void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3281 if (!ParamD) 3282 return; 3283 3284 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3285 3286 // If this parameter has an unparsed default argument, clear it out 3287 // to make way for the parsed default argument. 3288 if (Param->hasUnparsedDefaultArg()) 3289 Param->setDefaultArg(0); 3290 3291 S->AddDecl(Param); 3292 if (Param->getDeclName()) 3293 IdResolver.AddDecl(Param); 3294} 3295 3296/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3297/// processing the delayed method declaration for Method. The method 3298/// declaration is now considered finished. There may be a separate 3299/// ActOnStartOfFunctionDef action later (not necessarily 3300/// immediately!) for this method, if it was also defined inside the 3301/// class body. 3302void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3303 if (!MethodD) 3304 return; 3305 3306 AdjustDeclIfTemplate(MethodD); 3307 3308 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3309 3310 // Now that we have our default arguments, check the constructor 3311 // again. It could produce additional diagnostics or affect whether 3312 // the class has implicitly-declared destructors, among other 3313 // things. 3314 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3315 CheckConstructor(Constructor); 3316 3317 // Check the default arguments, which we may have added. 3318 if (!Method->isInvalidDecl()) 3319 CheckCXXDefaultArguments(Method); 3320} 3321 3322/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3323/// the well-formedness of the constructor declarator @p D with type @p 3324/// R. If there are any errors in the declarator, this routine will 3325/// emit diagnostics and set the invalid bit to true. In any case, the type 3326/// will be updated to reflect a well-formed type for the constructor and 3327/// returned. 3328QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3329 StorageClass &SC) { 3330 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3331 3332 // C++ [class.ctor]p3: 3333 // A constructor shall not be virtual (10.3) or static (9.4). A 3334 // constructor can be invoked for a const, volatile or const 3335 // volatile object. A constructor shall not be declared const, 3336 // volatile, or const volatile (9.3.2). 3337 if (isVirtual) { 3338 if (!D.isInvalidType()) 3339 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3340 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3341 << SourceRange(D.getIdentifierLoc()); 3342 D.setInvalidType(); 3343 } 3344 if (SC == SC_Static) { 3345 if (!D.isInvalidType()) 3346 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3347 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3348 << SourceRange(D.getIdentifierLoc()); 3349 D.setInvalidType(); 3350 SC = SC_None; 3351 } 3352 3353 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3354 if (FTI.TypeQuals != 0) { 3355 if (FTI.TypeQuals & Qualifiers::Const) 3356 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3357 << "const" << SourceRange(D.getIdentifierLoc()); 3358 if (FTI.TypeQuals & Qualifiers::Volatile) 3359 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3360 << "volatile" << SourceRange(D.getIdentifierLoc()); 3361 if (FTI.TypeQuals & Qualifiers::Restrict) 3362 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3363 << "restrict" << SourceRange(D.getIdentifierLoc()); 3364 D.setInvalidType(); 3365 } 3366 3367 // C++0x [class.ctor]p4: 3368 // A constructor shall not be declared with a ref-qualifier. 3369 if (FTI.hasRefQualifier()) { 3370 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3371 << FTI.RefQualifierIsLValueRef 3372 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3373 D.setInvalidType(); 3374 } 3375 3376 // Rebuild the function type "R" without any type qualifiers (in 3377 // case any of the errors above fired) and with "void" as the 3378 // return type, since constructors don't have return types. 3379 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3380 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3381 return R; 3382 3383 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3384 EPI.TypeQuals = 0; 3385 EPI.RefQualifier = RQ_None; 3386 3387 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3388 Proto->getNumArgs(), EPI); 3389} 3390 3391/// CheckConstructor - Checks a fully-formed constructor for 3392/// well-formedness, issuing any diagnostics required. Returns true if 3393/// the constructor declarator is invalid. 3394void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3395 CXXRecordDecl *ClassDecl 3396 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3397 if (!ClassDecl) 3398 return Constructor->setInvalidDecl(); 3399 3400 // C++ [class.copy]p3: 3401 // A declaration of a constructor for a class X is ill-formed if 3402 // its first parameter is of type (optionally cv-qualified) X and 3403 // either there are no other parameters or else all other 3404 // parameters have default arguments. 3405 if (!Constructor->isInvalidDecl() && 3406 ((Constructor->getNumParams() == 1) || 3407 (Constructor->getNumParams() > 1 && 3408 Constructor->getParamDecl(1)->hasDefaultArg())) && 3409 Constructor->getTemplateSpecializationKind() 3410 != TSK_ImplicitInstantiation) { 3411 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3412 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3413 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3414 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3415 const char *ConstRef 3416 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3417 : " const &"; 3418 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3419 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3420 3421 // FIXME: Rather that making the constructor invalid, we should endeavor 3422 // to fix the type. 3423 Constructor->setInvalidDecl(); 3424 } 3425 } 3426} 3427 3428/// CheckDestructor - Checks a fully-formed destructor definition for 3429/// well-formedness, issuing any diagnostics required. Returns true 3430/// on error. 3431bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3432 CXXRecordDecl *RD = Destructor->getParent(); 3433 3434 if (Destructor->isVirtual()) { 3435 SourceLocation Loc; 3436 3437 if (!Destructor->isImplicit()) 3438 Loc = Destructor->getLocation(); 3439 else 3440 Loc = RD->getLocation(); 3441 3442 // If we have a virtual destructor, look up the deallocation function 3443 FunctionDecl *OperatorDelete = 0; 3444 DeclarationName Name = 3445 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3446 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3447 return true; 3448 3449 MarkDeclarationReferenced(Loc, OperatorDelete); 3450 3451 Destructor->setOperatorDelete(OperatorDelete); 3452 } 3453 3454 return false; 3455} 3456 3457static inline bool 3458FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3459 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3460 FTI.ArgInfo[0].Param && 3461 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3462} 3463 3464/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3465/// the well-formednes of the destructor declarator @p D with type @p 3466/// R. If there are any errors in the declarator, this routine will 3467/// emit diagnostics and set the declarator to invalid. Even if this happens, 3468/// will be updated to reflect a well-formed type for the destructor and 3469/// returned. 3470QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3471 StorageClass& SC) { 3472 // C++ [class.dtor]p1: 3473 // [...] A typedef-name that names a class is a class-name 3474 // (7.1.3); however, a typedef-name that names a class shall not 3475 // be used as the identifier in the declarator for a destructor 3476 // declaration. 3477 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3478 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3479 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3480 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3481 3482 // C++ [class.dtor]p2: 3483 // A destructor is used to destroy objects of its class type. A 3484 // destructor takes no parameters, and no return type can be 3485 // specified for it (not even void). The address of a destructor 3486 // shall not be taken. A destructor shall not be static. A 3487 // destructor can be invoked for a const, volatile or const 3488 // volatile object. A destructor shall not be declared const, 3489 // volatile or const volatile (9.3.2). 3490 if (SC == SC_Static) { 3491 if (!D.isInvalidType()) 3492 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3494 << SourceRange(D.getIdentifierLoc()) 3495 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3496 3497 SC = SC_None; 3498 } 3499 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3500 // Destructors don't have return types, but the parser will 3501 // happily parse something like: 3502 // 3503 // class X { 3504 // float ~X(); 3505 // }; 3506 // 3507 // The return type will be eliminated later. 3508 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3509 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3510 << SourceRange(D.getIdentifierLoc()); 3511 } 3512 3513 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3514 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3515 if (FTI.TypeQuals & Qualifiers::Const) 3516 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3517 << "const" << SourceRange(D.getIdentifierLoc()); 3518 if (FTI.TypeQuals & Qualifiers::Volatile) 3519 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3520 << "volatile" << SourceRange(D.getIdentifierLoc()); 3521 if (FTI.TypeQuals & Qualifiers::Restrict) 3522 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3523 << "restrict" << SourceRange(D.getIdentifierLoc()); 3524 D.setInvalidType(); 3525 } 3526 3527 // C++0x [class.dtor]p2: 3528 // A destructor shall not be declared with a ref-qualifier. 3529 if (FTI.hasRefQualifier()) { 3530 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3531 << FTI.RefQualifierIsLValueRef 3532 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3533 D.setInvalidType(); 3534 } 3535 3536 // Make sure we don't have any parameters. 3537 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3538 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3539 3540 // Delete the parameters. 3541 FTI.freeArgs(); 3542 D.setInvalidType(); 3543 } 3544 3545 // Make sure the destructor isn't variadic. 3546 if (FTI.isVariadic) { 3547 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3548 D.setInvalidType(); 3549 } 3550 3551 // Rebuild the function type "R" without any type qualifiers or 3552 // parameters (in case any of the errors above fired) and with 3553 // "void" as the return type, since destructors don't have return 3554 // types. 3555 if (!D.isInvalidType()) 3556 return R; 3557 3558 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3559 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3560 EPI.Variadic = false; 3561 EPI.TypeQuals = 0; 3562 EPI.RefQualifier = RQ_None; 3563 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3564} 3565 3566/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3567/// well-formednes of the conversion function declarator @p D with 3568/// type @p R. If there are any errors in the declarator, this routine 3569/// will emit diagnostics and return true. Otherwise, it will return 3570/// false. Either way, the type @p R will be updated to reflect a 3571/// well-formed type for the conversion operator. 3572void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3573 StorageClass& SC) { 3574 // C++ [class.conv.fct]p1: 3575 // Neither parameter types nor return type can be specified. The 3576 // type of a conversion function (8.3.5) is "function taking no 3577 // parameter returning conversion-type-id." 3578 if (SC == SC_Static) { 3579 if (!D.isInvalidType()) 3580 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3581 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3582 << SourceRange(D.getIdentifierLoc()); 3583 D.setInvalidType(); 3584 SC = SC_None; 3585 } 3586 3587 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3588 3589 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3590 // Conversion functions don't have return types, but the parser will 3591 // happily parse something like: 3592 // 3593 // class X { 3594 // float operator bool(); 3595 // }; 3596 // 3597 // The return type will be changed later anyway. 3598 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3599 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3600 << SourceRange(D.getIdentifierLoc()); 3601 D.setInvalidType(); 3602 } 3603 3604 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3605 3606 // Make sure we don't have any parameters. 3607 if (Proto->getNumArgs() > 0) { 3608 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3609 3610 // Delete the parameters. 3611 D.getFunctionTypeInfo().freeArgs(); 3612 D.setInvalidType(); 3613 } else if (Proto->isVariadic()) { 3614 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3615 D.setInvalidType(); 3616 } 3617 3618 // Diagnose "&operator bool()" and other such nonsense. This 3619 // is actually a gcc extension which we don't support. 3620 if (Proto->getResultType() != ConvType) { 3621 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3622 << Proto->getResultType(); 3623 D.setInvalidType(); 3624 ConvType = Proto->getResultType(); 3625 } 3626 3627 // C++ [class.conv.fct]p4: 3628 // The conversion-type-id shall not represent a function type nor 3629 // an array type. 3630 if (ConvType->isArrayType()) { 3631 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3632 ConvType = Context.getPointerType(ConvType); 3633 D.setInvalidType(); 3634 } else if (ConvType->isFunctionType()) { 3635 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3636 ConvType = Context.getPointerType(ConvType); 3637 D.setInvalidType(); 3638 } 3639 3640 // Rebuild the function type "R" without any parameters (in case any 3641 // of the errors above fired) and with the conversion type as the 3642 // return type. 3643 if (D.isInvalidType()) 3644 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3645 3646 // C++0x explicit conversion operators. 3647 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3648 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3649 diag::warn_explicit_conversion_functions) 3650 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3651} 3652 3653/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3654/// the declaration of the given C++ conversion function. This routine 3655/// is responsible for recording the conversion function in the C++ 3656/// class, if possible. 3657Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3658 assert(Conversion && "Expected to receive a conversion function declaration"); 3659 3660 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3661 3662 // Make sure we aren't redeclaring the conversion function. 3663 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3664 3665 // C++ [class.conv.fct]p1: 3666 // [...] A conversion function is never used to convert a 3667 // (possibly cv-qualified) object to the (possibly cv-qualified) 3668 // same object type (or a reference to it), to a (possibly 3669 // cv-qualified) base class of that type (or a reference to it), 3670 // or to (possibly cv-qualified) void. 3671 // FIXME: Suppress this warning if the conversion function ends up being a 3672 // virtual function that overrides a virtual function in a base class. 3673 QualType ClassType 3674 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3675 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3676 ConvType = ConvTypeRef->getPointeeType(); 3677 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3678 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3679 /* Suppress diagnostics for instantiations. */; 3680 else if (ConvType->isRecordType()) { 3681 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3682 if (ConvType == ClassType) 3683 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3684 << ClassType; 3685 else if (IsDerivedFrom(ClassType, ConvType)) 3686 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3687 << ClassType << ConvType; 3688 } else if (ConvType->isVoidType()) { 3689 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3690 << ClassType << ConvType; 3691 } 3692 3693 if (FunctionTemplateDecl *ConversionTemplate 3694 = Conversion->getDescribedFunctionTemplate()) 3695 return ConversionTemplate; 3696 3697 return Conversion; 3698} 3699 3700//===----------------------------------------------------------------------===// 3701// Namespace Handling 3702//===----------------------------------------------------------------------===// 3703 3704 3705 3706/// ActOnStartNamespaceDef - This is called at the start of a namespace 3707/// definition. 3708Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3709 SourceLocation InlineLoc, 3710 SourceLocation NamespaceLoc, 3711 SourceLocation IdentLoc, 3712 IdentifierInfo *II, 3713 SourceLocation LBrace, 3714 AttributeList *AttrList) { 3715 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3716 // For anonymous namespace, take the location of the left brace. 3717 SourceLocation Loc = II ? IdentLoc : LBrace; 3718 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3719 StartLoc, Loc, II); 3720 Namespc->setInline(InlineLoc.isValid()); 3721 3722 Scope *DeclRegionScope = NamespcScope->getParent(); 3723 3724 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3725 3726 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3727 PushNamespaceVisibilityAttr(Attr); 3728 3729 if (II) { 3730 // C++ [namespace.def]p2: 3731 // The identifier in an original-namespace-definition shall not 3732 // have been previously defined in the declarative region in 3733 // which the original-namespace-definition appears. The 3734 // identifier in an original-namespace-definition is the name of 3735 // the namespace. Subsequently in that declarative region, it is 3736 // treated as an original-namespace-name. 3737 // 3738 // Since namespace names are unique in their scope, and we don't 3739 // look through using directives, just 3740 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3741 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3742 3743 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3744 // This is an extended namespace definition. 3745 if (Namespc->isInline() != OrigNS->isInline()) { 3746 // inline-ness must match 3747 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3748 << Namespc->isInline(); 3749 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3750 Namespc->setInvalidDecl(); 3751 // Recover by ignoring the new namespace's inline status. 3752 Namespc->setInline(OrigNS->isInline()); 3753 } 3754 3755 // Attach this namespace decl to the chain of extended namespace 3756 // definitions. 3757 OrigNS->setNextNamespace(Namespc); 3758 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3759 3760 // Remove the previous declaration from the scope. 3761 if (DeclRegionScope->isDeclScope(OrigNS)) { 3762 IdResolver.RemoveDecl(OrigNS); 3763 DeclRegionScope->RemoveDecl(OrigNS); 3764 } 3765 } else if (PrevDecl) { 3766 // This is an invalid name redefinition. 3767 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3768 << Namespc->getDeclName(); 3769 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3770 Namespc->setInvalidDecl(); 3771 // Continue on to push Namespc as current DeclContext and return it. 3772 } else if (II->isStr("std") && 3773 CurContext->getRedeclContext()->isTranslationUnit()) { 3774 // This is the first "real" definition of the namespace "std", so update 3775 // our cache of the "std" namespace to point at this definition. 3776 if (NamespaceDecl *StdNS = getStdNamespace()) { 3777 // We had already defined a dummy namespace "std". Link this new 3778 // namespace definition to the dummy namespace "std". 3779 StdNS->setNextNamespace(Namespc); 3780 StdNS->setLocation(IdentLoc); 3781 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3782 } 3783 3784 // Make our StdNamespace cache point at the first real definition of the 3785 // "std" namespace. 3786 StdNamespace = Namespc; 3787 } 3788 3789 PushOnScopeChains(Namespc, DeclRegionScope); 3790 } else { 3791 // Anonymous namespaces. 3792 assert(Namespc->isAnonymousNamespace()); 3793 3794 // Link the anonymous namespace into its parent. 3795 NamespaceDecl *PrevDecl; 3796 DeclContext *Parent = CurContext->getRedeclContext(); 3797 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3798 PrevDecl = TU->getAnonymousNamespace(); 3799 TU->setAnonymousNamespace(Namespc); 3800 } else { 3801 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3802 PrevDecl = ND->getAnonymousNamespace(); 3803 ND->setAnonymousNamespace(Namespc); 3804 } 3805 3806 // Link the anonymous namespace with its previous declaration. 3807 if (PrevDecl) { 3808 assert(PrevDecl->isAnonymousNamespace()); 3809 assert(!PrevDecl->getNextNamespace()); 3810 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3811 PrevDecl->setNextNamespace(Namespc); 3812 3813 if (Namespc->isInline() != PrevDecl->isInline()) { 3814 // inline-ness must match 3815 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3816 << Namespc->isInline(); 3817 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3818 Namespc->setInvalidDecl(); 3819 // Recover by ignoring the new namespace's inline status. 3820 Namespc->setInline(PrevDecl->isInline()); 3821 } 3822 } 3823 3824 CurContext->addDecl(Namespc); 3825 3826 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3827 // behaves as if it were replaced by 3828 // namespace unique { /* empty body */ } 3829 // using namespace unique; 3830 // namespace unique { namespace-body } 3831 // where all occurrences of 'unique' in a translation unit are 3832 // replaced by the same identifier and this identifier differs 3833 // from all other identifiers in the entire program. 3834 3835 // We just create the namespace with an empty name and then add an 3836 // implicit using declaration, just like the standard suggests. 3837 // 3838 // CodeGen enforces the "universally unique" aspect by giving all 3839 // declarations semantically contained within an anonymous 3840 // namespace internal linkage. 3841 3842 if (!PrevDecl) { 3843 UsingDirectiveDecl* UD 3844 = UsingDirectiveDecl::Create(Context, CurContext, 3845 /* 'using' */ LBrace, 3846 /* 'namespace' */ SourceLocation(), 3847 /* qualifier */ NestedNameSpecifierLoc(), 3848 /* identifier */ SourceLocation(), 3849 Namespc, 3850 /* Ancestor */ CurContext); 3851 UD->setImplicit(); 3852 CurContext->addDecl(UD); 3853 } 3854 } 3855 3856 // Although we could have an invalid decl (i.e. the namespace name is a 3857 // redefinition), push it as current DeclContext and try to continue parsing. 3858 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3859 // for the namespace has the declarations that showed up in that particular 3860 // namespace definition. 3861 PushDeclContext(NamespcScope, Namespc); 3862 return Namespc; 3863} 3864 3865/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3866/// is a namespace alias, returns the namespace it points to. 3867static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3868 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3869 return AD->getNamespace(); 3870 return dyn_cast_or_null<NamespaceDecl>(D); 3871} 3872 3873/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3874/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3875void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3876 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3877 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3878 Namespc->setRBraceLoc(RBrace); 3879 PopDeclContext(); 3880 if (Namespc->hasAttr<VisibilityAttr>()) 3881 PopPragmaVisibility(); 3882} 3883 3884CXXRecordDecl *Sema::getStdBadAlloc() const { 3885 return cast_or_null<CXXRecordDecl>( 3886 StdBadAlloc.get(Context.getExternalSource())); 3887} 3888 3889NamespaceDecl *Sema::getStdNamespace() const { 3890 return cast_or_null<NamespaceDecl>( 3891 StdNamespace.get(Context.getExternalSource())); 3892} 3893 3894/// \brief Retrieve the special "std" namespace, which may require us to 3895/// implicitly define the namespace. 3896NamespaceDecl *Sema::getOrCreateStdNamespace() { 3897 if (!StdNamespace) { 3898 // The "std" namespace has not yet been defined, so build one implicitly. 3899 StdNamespace = NamespaceDecl::Create(Context, 3900 Context.getTranslationUnitDecl(), 3901 SourceLocation(), SourceLocation(), 3902 &PP.getIdentifierTable().get("std")); 3903 getStdNamespace()->setImplicit(true); 3904 } 3905 3906 return getStdNamespace(); 3907} 3908 3909/// \brief Determine whether a using statement is in a context where it will be 3910/// apply in all contexts. 3911static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3912 switch (CurContext->getDeclKind()) { 3913 case Decl::TranslationUnit: 3914 return true; 3915 case Decl::LinkageSpec: 3916 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3917 default: 3918 return false; 3919 } 3920} 3921 3922Decl *Sema::ActOnUsingDirective(Scope *S, 3923 SourceLocation UsingLoc, 3924 SourceLocation NamespcLoc, 3925 CXXScopeSpec &SS, 3926 SourceLocation IdentLoc, 3927 IdentifierInfo *NamespcName, 3928 AttributeList *AttrList) { 3929 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3930 assert(NamespcName && "Invalid NamespcName."); 3931 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3932 3933 // This can only happen along a recovery path. 3934 while (S->getFlags() & Scope::TemplateParamScope) 3935 S = S->getParent(); 3936 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3937 3938 UsingDirectiveDecl *UDir = 0; 3939 NestedNameSpecifier *Qualifier = 0; 3940 if (SS.isSet()) 3941 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3942 3943 // Lookup namespace name. 3944 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3945 LookupParsedName(R, S, &SS); 3946 if (R.isAmbiguous()) 3947 return 0; 3948 3949 if (R.empty()) { 3950 // Allow "using namespace std;" or "using namespace ::std;" even if 3951 // "std" hasn't been defined yet, for GCC compatibility. 3952 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3953 NamespcName->isStr("std")) { 3954 Diag(IdentLoc, diag::ext_using_undefined_std); 3955 R.addDecl(getOrCreateStdNamespace()); 3956 R.resolveKind(); 3957 } 3958 // Otherwise, attempt typo correction. 3959 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3960 CTC_NoKeywords, 0)) { 3961 if (R.getAsSingle<NamespaceDecl>() || 3962 R.getAsSingle<NamespaceAliasDecl>()) { 3963 if (DeclContext *DC = computeDeclContext(SS, false)) 3964 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3965 << NamespcName << DC << Corrected << SS.getRange() 3966 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3967 else 3968 Diag(IdentLoc, diag::err_using_directive_suggest) 3969 << NamespcName << Corrected 3970 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3971 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3972 << Corrected; 3973 3974 NamespcName = Corrected.getAsIdentifierInfo(); 3975 } else { 3976 R.clear(); 3977 R.setLookupName(NamespcName); 3978 } 3979 } 3980 } 3981 3982 if (!R.empty()) { 3983 NamedDecl *Named = R.getFoundDecl(); 3984 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3985 && "expected namespace decl"); 3986 // C++ [namespace.udir]p1: 3987 // A using-directive specifies that the names in the nominated 3988 // namespace can be used in the scope in which the 3989 // using-directive appears after the using-directive. During 3990 // unqualified name lookup (3.4.1), the names appear as if they 3991 // were declared in the nearest enclosing namespace which 3992 // contains both the using-directive and the nominated 3993 // namespace. [Note: in this context, "contains" means "contains 3994 // directly or indirectly". ] 3995 3996 // Find enclosing context containing both using-directive and 3997 // nominated namespace. 3998 NamespaceDecl *NS = getNamespaceDecl(Named); 3999 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4000 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4001 CommonAncestor = CommonAncestor->getParent(); 4002 4003 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4004 SS.getWithLocInContext(Context), 4005 IdentLoc, Named, CommonAncestor); 4006 4007 if (IsUsingDirectiveInToplevelContext(CurContext) && 4008 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4009 Diag(IdentLoc, diag::warn_using_directive_in_header); 4010 } 4011 4012 PushUsingDirective(S, UDir); 4013 } else { 4014 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4015 } 4016 4017 // FIXME: We ignore attributes for now. 4018 return UDir; 4019} 4020 4021void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4022 // If scope has associated entity, then using directive is at namespace 4023 // or translation unit scope. We add UsingDirectiveDecls, into 4024 // it's lookup structure. 4025 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4026 Ctx->addDecl(UDir); 4027 else 4028 // Otherwise it is block-sope. using-directives will affect lookup 4029 // only to the end of scope. 4030 S->PushUsingDirective(UDir); 4031} 4032 4033 4034Decl *Sema::ActOnUsingDeclaration(Scope *S, 4035 AccessSpecifier AS, 4036 bool HasUsingKeyword, 4037 SourceLocation UsingLoc, 4038 CXXScopeSpec &SS, 4039 UnqualifiedId &Name, 4040 AttributeList *AttrList, 4041 bool IsTypeName, 4042 SourceLocation TypenameLoc) { 4043 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4044 4045 switch (Name.getKind()) { 4046 case UnqualifiedId::IK_Identifier: 4047 case UnqualifiedId::IK_OperatorFunctionId: 4048 case UnqualifiedId::IK_LiteralOperatorId: 4049 case UnqualifiedId::IK_ConversionFunctionId: 4050 break; 4051 4052 case UnqualifiedId::IK_ConstructorName: 4053 case UnqualifiedId::IK_ConstructorTemplateId: 4054 // C++0x inherited constructors. 4055 if (getLangOptions().CPlusPlus0x) break; 4056 4057 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4058 << SS.getRange(); 4059 return 0; 4060 4061 case UnqualifiedId::IK_DestructorName: 4062 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4063 << SS.getRange(); 4064 return 0; 4065 4066 case UnqualifiedId::IK_TemplateId: 4067 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4068 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4069 return 0; 4070 } 4071 4072 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4073 DeclarationName TargetName = TargetNameInfo.getName(); 4074 if (!TargetName) 4075 return 0; 4076 4077 // Warn about using declarations. 4078 // TODO: store that the declaration was written without 'using' and 4079 // talk about access decls instead of using decls in the 4080 // diagnostics. 4081 if (!HasUsingKeyword) { 4082 UsingLoc = Name.getSourceRange().getBegin(); 4083 4084 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4085 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4086 } 4087 4088 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4089 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4090 return 0; 4091 4092 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4093 TargetNameInfo, AttrList, 4094 /* IsInstantiation */ false, 4095 IsTypeName, TypenameLoc); 4096 if (UD) 4097 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4098 4099 return UD; 4100} 4101 4102/// \brief Determine whether a using declaration considers the given 4103/// declarations as "equivalent", e.g., if they are redeclarations of 4104/// the same entity or are both typedefs of the same type. 4105static bool 4106IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4107 bool &SuppressRedeclaration) { 4108 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4109 SuppressRedeclaration = false; 4110 return true; 4111 } 4112 4113 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4114 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4115 SuppressRedeclaration = true; 4116 return Context.hasSameType(TD1->getUnderlyingType(), 4117 TD2->getUnderlyingType()); 4118 } 4119 4120 return false; 4121} 4122 4123 4124/// Determines whether to create a using shadow decl for a particular 4125/// decl, given the set of decls existing prior to this using lookup. 4126bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4127 const LookupResult &Previous) { 4128 // Diagnose finding a decl which is not from a base class of the 4129 // current class. We do this now because there are cases where this 4130 // function will silently decide not to build a shadow decl, which 4131 // will pre-empt further diagnostics. 4132 // 4133 // We don't need to do this in C++0x because we do the check once on 4134 // the qualifier. 4135 // 4136 // FIXME: diagnose the following if we care enough: 4137 // struct A { int foo; }; 4138 // struct B : A { using A::foo; }; 4139 // template <class T> struct C : A {}; 4140 // template <class T> struct D : C<T> { using B::foo; } // <--- 4141 // This is invalid (during instantiation) in C++03 because B::foo 4142 // resolves to the using decl in B, which is not a base class of D<T>. 4143 // We can't diagnose it immediately because C<T> is an unknown 4144 // specialization. The UsingShadowDecl in D<T> then points directly 4145 // to A::foo, which will look well-formed when we instantiate. 4146 // The right solution is to not collapse the shadow-decl chain. 4147 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4148 DeclContext *OrigDC = Orig->getDeclContext(); 4149 4150 // Handle enums and anonymous structs. 4151 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4152 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4153 while (OrigRec->isAnonymousStructOrUnion()) 4154 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4155 4156 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4157 if (OrigDC == CurContext) { 4158 Diag(Using->getLocation(), 4159 diag::err_using_decl_nested_name_specifier_is_current_class) 4160 << Using->getQualifierLoc().getSourceRange(); 4161 Diag(Orig->getLocation(), diag::note_using_decl_target); 4162 return true; 4163 } 4164 4165 Diag(Using->getQualifierLoc().getBeginLoc(), 4166 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4167 << Using->getQualifier() 4168 << cast<CXXRecordDecl>(CurContext) 4169 << Using->getQualifierLoc().getSourceRange(); 4170 Diag(Orig->getLocation(), diag::note_using_decl_target); 4171 return true; 4172 } 4173 } 4174 4175 if (Previous.empty()) return false; 4176 4177 NamedDecl *Target = Orig; 4178 if (isa<UsingShadowDecl>(Target)) 4179 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4180 4181 // If the target happens to be one of the previous declarations, we 4182 // don't have a conflict. 4183 // 4184 // FIXME: but we might be increasing its access, in which case we 4185 // should redeclare it. 4186 NamedDecl *NonTag = 0, *Tag = 0; 4187 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4188 I != E; ++I) { 4189 NamedDecl *D = (*I)->getUnderlyingDecl(); 4190 bool Result; 4191 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4192 return Result; 4193 4194 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4195 } 4196 4197 if (Target->isFunctionOrFunctionTemplate()) { 4198 FunctionDecl *FD; 4199 if (isa<FunctionTemplateDecl>(Target)) 4200 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4201 else 4202 FD = cast<FunctionDecl>(Target); 4203 4204 NamedDecl *OldDecl = 0; 4205 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4206 case Ovl_Overload: 4207 return false; 4208 4209 case Ovl_NonFunction: 4210 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4211 break; 4212 4213 // We found a decl with the exact signature. 4214 case Ovl_Match: 4215 // If we're in a record, we want to hide the target, so we 4216 // return true (without a diagnostic) to tell the caller not to 4217 // build a shadow decl. 4218 if (CurContext->isRecord()) 4219 return true; 4220 4221 // If we're not in a record, this is an error. 4222 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4223 break; 4224 } 4225 4226 Diag(Target->getLocation(), diag::note_using_decl_target); 4227 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4228 return true; 4229 } 4230 4231 // Target is not a function. 4232 4233 if (isa<TagDecl>(Target)) { 4234 // No conflict between a tag and a non-tag. 4235 if (!Tag) return false; 4236 4237 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4238 Diag(Target->getLocation(), diag::note_using_decl_target); 4239 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4240 return true; 4241 } 4242 4243 // No conflict between a tag and a non-tag. 4244 if (!NonTag) return false; 4245 4246 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4247 Diag(Target->getLocation(), diag::note_using_decl_target); 4248 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4249 return true; 4250} 4251 4252/// Builds a shadow declaration corresponding to a 'using' declaration. 4253UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4254 UsingDecl *UD, 4255 NamedDecl *Orig) { 4256 4257 // If we resolved to another shadow declaration, just coalesce them. 4258 NamedDecl *Target = Orig; 4259 if (isa<UsingShadowDecl>(Target)) { 4260 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4261 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4262 } 4263 4264 UsingShadowDecl *Shadow 4265 = UsingShadowDecl::Create(Context, CurContext, 4266 UD->getLocation(), UD, Target); 4267 UD->addShadowDecl(Shadow); 4268 4269 Shadow->setAccess(UD->getAccess()); 4270 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4271 Shadow->setInvalidDecl(); 4272 4273 if (S) 4274 PushOnScopeChains(Shadow, S); 4275 else 4276 CurContext->addDecl(Shadow); 4277 4278 4279 return Shadow; 4280} 4281 4282/// Hides a using shadow declaration. This is required by the current 4283/// using-decl implementation when a resolvable using declaration in a 4284/// class is followed by a declaration which would hide or override 4285/// one or more of the using decl's targets; for example: 4286/// 4287/// struct Base { void foo(int); }; 4288/// struct Derived : Base { 4289/// using Base::foo; 4290/// void foo(int); 4291/// }; 4292/// 4293/// The governing language is C++03 [namespace.udecl]p12: 4294/// 4295/// When a using-declaration brings names from a base class into a 4296/// derived class scope, member functions in the derived class 4297/// override and/or hide member functions with the same name and 4298/// parameter types in a base class (rather than conflicting). 4299/// 4300/// There are two ways to implement this: 4301/// (1) optimistically create shadow decls when they're not hidden 4302/// by existing declarations, or 4303/// (2) don't create any shadow decls (or at least don't make them 4304/// visible) until we've fully parsed/instantiated the class. 4305/// The problem with (1) is that we might have to retroactively remove 4306/// a shadow decl, which requires several O(n) operations because the 4307/// decl structures are (very reasonably) not designed for removal. 4308/// (2) avoids this but is very fiddly and phase-dependent. 4309void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4310 if (Shadow->getDeclName().getNameKind() == 4311 DeclarationName::CXXConversionFunctionName) 4312 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4313 4314 // Remove it from the DeclContext... 4315 Shadow->getDeclContext()->removeDecl(Shadow); 4316 4317 // ...and the scope, if applicable... 4318 if (S) { 4319 S->RemoveDecl(Shadow); 4320 IdResolver.RemoveDecl(Shadow); 4321 } 4322 4323 // ...and the using decl. 4324 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4325 4326 // TODO: complain somehow if Shadow was used. It shouldn't 4327 // be possible for this to happen, because...? 4328} 4329 4330/// Builds a using declaration. 4331/// 4332/// \param IsInstantiation - Whether this call arises from an 4333/// instantiation of an unresolved using declaration. We treat 4334/// the lookup differently for these declarations. 4335NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4336 SourceLocation UsingLoc, 4337 CXXScopeSpec &SS, 4338 const DeclarationNameInfo &NameInfo, 4339 AttributeList *AttrList, 4340 bool IsInstantiation, 4341 bool IsTypeName, 4342 SourceLocation TypenameLoc) { 4343 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4344 SourceLocation IdentLoc = NameInfo.getLoc(); 4345 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4346 4347 // FIXME: We ignore attributes for now. 4348 4349 if (SS.isEmpty()) { 4350 Diag(IdentLoc, diag::err_using_requires_qualname); 4351 return 0; 4352 } 4353 4354 // Do the redeclaration lookup in the current scope. 4355 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4356 ForRedeclaration); 4357 Previous.setHideTags(false); 4358 if (S) { 4359 LookupName(Previous, S); 4360 4361 // It is really dumb that we have to do this. 4362 LookupResult::Filter F = Previous.makeFilter(); 4363 while (F.hasNext()) { 4364 NamedDecl *D = F.next(); 4365 if (!isDeclInScope(D, CurContext, S)) 4366 F.erase(); 4367 } 4368 F.done(); 4369 } else { 4370 assert(IsInstantiation && "no scope in non-instantiation"); 4371 assert(CurContext->isRecord() && "scope not record in instantiation"); 4372 LookupQualifiedName(Previous, CurContext); 4373 } 4374 4375 // Check for invalid redeclarations. 4376 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4377 return 0; 4378 4379 // Check for bad qualifiers. 4380 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4381 return 0; 4382 4383 DeclContext *LookupContext = computeDeclContext(SS); 4384 NamedDecl *D; 4385 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4386 if (!LookupContext) { 4387 if (IsTypeName) { 4388 // FIXME: not all declaration name kinds are legal here 4389 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4390 UsingLoc, TypenameLoc, 4391 QualifierLoc, 4392 IdentLoc, NameInfo.getName()); 4393 } else { 4394 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4395 QualifierLoc, NameInfo); 4396 } 4397 } else { 4398 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4399 NameInfo, IsTypeName); 4400 } 4401 D->setAccess(AS); 4402 CurContext->addDecl(D); 4403 4404 if (!LookupContext) return D; 4405 UsingDecl *UD = cast<UsingDecl>(D); 4406 4407 if (RequireCompleteDeclContext(SS, LookupContext)) { 4408 UD->setInvalidDecl(); 4409 return UD; 4410 } 4411 4412 // Constructor inheriting using decls get special treatment. 4413 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4414 if (CheckInheritedConstructorUsingDecl(UD)) 4415 UD->setInvalidDecl(); 4416 return UD; 4417 } 4418 4419 // Otherwise, look up the target name. 4420 4421 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4422 4423 // Unlike most lookups, we don't always want to hide tag 4424 // declarations: tag names are visible through the using declaration 4425 // even if hidden by ordinary names, *except* in a dependent context 4426 // where it's important for the sanity of two-phase lookup. 4427 if (!IsInstantiation) 4428 R.setHideTags(false); 4429 4430 LookupQualifiedName(R, LookupContext); 4431 4432 if (R.empty()) { 4433 Diag(IdentLoc, diag::err_no_member) 4434 << NameInfo.getName() << LookupContext << SS.getRange(); 4435 UD->setInvalidDecl(); 4436 return UD; 4437 } 4438 4439 if (R.isAmbiguous()) { 4440 UD->setInvalidDecl(); 4441 return UD; 4442 } 4443 4444 if (IsTypeName) { 4445 // If we asked for a typename and got a non-type decl, error out. 4446 if (!R.getAsSingle<TypeDecl>()) { 4447 Diag(IdentLoc, diag::err_using_typename_non_type); 4448 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4449 Diag((*I)->getUnderlyingDecl()->getLocation(), 4450 diag::note_using_decl_target); 4451 UD->setInvalidDecl(); 4452 return UD; 4453 } 4454 } else { 4455 // If we asked for a non-typename and we got a type, error out, 4456 // but only if this is an instantiation of an unresolved using 4457 // decl. Otherwise just silently find the type name. 4458 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4459 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4460 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4461 UD->setInvalidDecl(); 4462 return UD; 4463 } 4464 } 4465 4466 // C++0x N2914 [namespace.udecl]p6: 4467 // A using-declaration shall not name a namespace. 4468 if (R.getAsSingle<NamespaceDecl>()) { 4469 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4470 << SS.getRange(); 4471 UD->setInvalidDecl(); 4472 return UD; 4473 } 4474 4475 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4476 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4477 BuildUsingShadowDecl(S, UD, *I); 4478 } 4479 4480 return UD; 4481} 4482 4483/// Additional checks for a using declaration referring to a constructor name. 4484bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4485 if (UD->isTypeName()) { 4486 // FIXME: Cannot specify typename when specifying constructor 4487 return true; 4488 } 4489 4490 const Type *SourceType = UD->getQualifier()->getAsType(); 4491 assert(SourceType && 4492 "Using decl naming constructor doesn't have type in scope spec."); 4493 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4494 4495 // Check whether the named type is a direct base class. 4496 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4497 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4498 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4499 BaseIt != BaseE; ++BaseIt) { 4500 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4501 if (CanonicalSourceType == BaseType) 4502 break; 4503 } 4504 4505 if (BaseIt == BaseE) { 4506 // Did not find SourceType in the bases. 4507 Diag(UD->getUsingLocation(), 4508 diag::err_using_decl_constructor_not_in_direct_base) 4509 << UD->getNameInfo().getSourceRange() 4510 << QualType(SourceType, 0) << TargetClass; 4511 return true; 4512 } 4513 4514 BaseIt->setInheritConstructors(); 4515 4516 return false; 4517} 4518 4519/// Checks that the given using declaration is not an invalid 4520/// redeclaration. Note that this is checking only for the using decl 4521/// itself, not for any ill-formedness among the UsingShadowDecls. 4522bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4523 bool isTypeName, 4524 const CXXScopeSpec &SS, 4525 SourceLocation NameLoc, 4526 const LookupResult &Prev) { 4527 // C++03 [namespace.udecl]p8: 4528 // C++0x [namespace.udecl]p10: 4529 // A using-declaration is a declaration and can therefore be used 4530 // repeatedly where (and only where) multiple declarations are 4531 // allowed. 4532 // 4533 // That's in non-member contexts. 4534 if (!CurContext->getRedeclContext()->isRecord()) 4535 return false; 4536 4537 NestedNameSpecifier *Qual 4538 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4539 4540 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4541 NamedDecl *D = *I; 4542 4543 bool DTypename; 4544 NestedNameSpecifier *DQual; 4545 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4546 DTypename = UD->isTypeName(); 4547 DQual = UD->getQualifier(); 4548 } else if (UnresolvedUsingValueDecl *UD 4549 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4550 DTypename = false; 4551 DQual = UD->getQualifier(); 4552 } else if (UnresolvedUsingTypenameDecl *UD 4553 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4554 DTypename = true; 4555 DQual = UD->getQualifier(); 4556 } else continue; 4557 4558 // using decls differ if one says 'typename' and the other doesn't. 4559 // FIXME: non-dependent using decls? 4560 if (isTypeName != DTypename) continue; 4561 4562 // using decls differ if they name different scopes (but note that 4563 // template instantiation can cause this check to trigger when it 4564 // didn't before instantiation). 4565 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4566 Context.getCanonicalNestedNameSpecifier(DQual)) 4567 continue; 4568 4569 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4570 Diag(D->getLocation(), diag::note_using_decl) << 1; 4571 return true; 4572 } 4573 4574 return false; 4575} 4576 4577 4578/// Checks that the given nested-name qualifier used in a using decl 4579/// in the current context is appropriately related to the current 4580/// scope. If an error is found, diagnoses it and returns true. 4581bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4582 const CXXScopeSpec &SS, 4583 SourceLocation NameLoc) { 4584 DeclContext *NamedContext = computeDeclContext(SS); 4585 4586 if (!CurContext->isRecord()) { 4587 // C++03 [namespace.udecl]p3: 4588 // C++0x [namespace.udecl]p8: 4589 // A using-declaration for a class member shall be a member-declaration. 4590 4591 // If we weren't able to compute a valid scope, it must be a 4592 // dependent class scope. 4593 if (!NamedContext || NamedContext->isRecord()) { 4594 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4595 << SS.getRange(); 4596 return true; 4597 } 4598 4599 // Otherwise, everything is known to be fine. 4600 return false; 4601 } 4602 4603 // The current scope is a record. 4604 4605 // If the named context is dependent, we can't decide much. 4606 if (!NamedContext) { 4607 // FIXME: in C++0x, we can diagnose if we can prove that the 4608 // nested-name-specifier does not refer to a base class, which is 4609 // still possible in some cases. 4610 4611 // Otherwise we have to conservatively report that things might be 4612 // okay. 4613 return false; 4614 } 4615 4616 if (!NamedContext->isRecord()) { 4617 // Ideally this would point at the last name in the specifier, 4618 // but we don't have that level of source info. 4619 Diag(SS.getRange().getBegin(), 4620 diag::err_using_decl_nested_name_specifier_is_not_class) 4621 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4622 return true; 4623 } 4624 4625 if (!NamedContext->isDependentContext() && 4626 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4627 return true; 4628 4629 if (getLangOptions().CPlusPlus0x) { 4630 // C++0x [namespace.udecl]p3: 4631 // In a using-declaration used as a member-declaration, the 4632 // nested-name-specifier shall name a base class of the class 4633 // being defined. 4634 4635 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4636 cast<CXXRecordDecl>(NamedContext))) { 4637 if (CurContext == NamedContext) { 4638 Diag(NameLoc, 4639 diag::err_using_decl_nested_name_specifier_is_current_class) 4640 << SS.getRange(); 4641 return true; 4642 } 4643 4644 Diag(SS.getRange().getBegin(), 4645 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4646 << (NestedNameSpecifier*) SS.getScopeRep() 4647 << cast<CXXRecordDecl>(CurContext) 4648 << SS.getRange(); 4649 return true; 4650 } 4651 4652 return false; 4653 } 4654 4655 // C++03 [namespace.udecl]p4: 4656 // A using-declaration used as a member-declaration shall refer 4657 // to a member of a base class of the class being defined [etc.]. 4658 4659 // Salient point: SS doesn't have to name a base class as long as 4660 // lookup only finds members from base classes. Therefore we can 4661 // diagnose here only if we can prove that that can't happen, 4662 // i.e. if the class hierarchies provably don't intersect. 4663 4664 // TODO: it would be nice if "definitely valid" results were cached 4665 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4666 // need to be repeated. 4667 4668 struct UserData { 4669 llvm::DenseSet<const CXXRecordDecl*> Bases; 4670 4671 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4672 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4673 Data->Bases.insert(Base); 4674 return true; 4675 } 4676 4677 bool hasDependentBases(const CXXRecordDecl *Class) { 4678 return !Class->forallBases(collect, this); 4679 } 4680 4681 /// Returns true if the base is dependent or is one of the 4682 /// accumulated base classes. 4683 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4684 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4685 return !Data->Bases.count(Base); 4686 } 4687 4688 bool mightShareBases(const CXXRecordDecl *Class) { 4689 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4690 } 4691 }; 4692 4693 UserData Data; 4694 4695 // Returns false if we find a dependent base. 4696 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4697 return false; 4698 4699 // Returns false if the class has a dependent base or if it or one 4700 // of its bases is present in the base set of the current context. 4701 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4702 return false; 4703 4704 Diag(SS.getRange().getBegin(), 4705 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4706 << (NestedNameSpecifier*) SS.getScopeRep() 4707 << cast<CXXRecordDecl>(CurContext) 4708 << SS.getRange(); 4709 4710 return true; 4711} 4712 4713Decl *Sema::ActOnAliasDeclaration(Scope *S, 4714 AccessSpecifier AS, 4715 SourceLocation UsingLoc, 4716 UnqualifiedId &Name, 4717 TypeResult Type) { 4718 assert((S->getFlags() & Scope::DeclScope) && 4719 "got alias-declaration outside of declaration scope"); 4720 4721 if (Type.isInvalid()) 4722 return 0; 4723 4724 bool Invalid = false; 4725 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4726 TypeSourceInfo *TInfo = 0; 4727 GetTypeFromParser(Type.get(), &TInfo); 4728 4729 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4730 return 0; 4731 4732 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4733 UPPC_DeclarationType)) 4734 Invalid = true; 4735 4736 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4737 LookupName(Previous, S); 4738 4739 // Warn about shadowing the name of a template parameter. 4740 if (Previous.isSingleResult() && 4741 Previous.getFoundDecl()->isTemplateParameter()) { 4742 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4743 Previous.getFoundDecl())) 4744 Invalid = true; 4745 Previous.clear(); 4746 } 4747 4748 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4749 "name in alias declaration must be an identifier"); 4750 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4751 Name.StartLocation, 4752 Name.Identifier, TInfo); 4753 4754 NewTD->setAccess(AS); 4755 4756 if (Invalid) 4757 NewTD->setInvalidDecl(); 4758 4759 bool Redeclaration = false; 4760 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4761 4762 if (!Redeclaration) 4763 PushOnScopeChains(NewTD, S); 4764 4765 return NewTD; 4766} 4767 4768Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4769 SourceLocation NamespaceLoc, 4770 SourceLocation AliasLoc, 4771 IdentifierInfo *Alias, 4772 CXXScopeSpec &SS, 4773 SourceLocation IdentLoc, 4774 IdentifierInfo *Ident) { 4775 4776 // Lookup the namespace name. 4777 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4778 LookupParsedName(R, S, &SS); 4779 4780 // Check if we have a previous declaration with the same name. 4781 NamedDecl *PrevDecl 4782 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4783 ForRedeclaration); 4784 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4785 PrevDecl = 0; 4786 4787 if (PrevDecl) { 4788 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4789 // We already have an alias with the same name that points to the same 4790 // namespace, so don't create a new one. 4791 // FIXME: At some point, we'll want to create the (redundant) 4792 // declaration to maintain better source information. 4793 if (!R.isAmbiguous() && !R.empty() && 4794 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4795 return 0; 4796 } 4797 4798 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4799 diag::err_redefinition_different_kind; 4800 Diag(AliasLoc, DiagID) << Alias; 4801 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4802 return 0; 4803 } 4804 4805 if (R.isAmbiguous()) 4806 return 0; 4807 4808 if (R.empty()) { 4809 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4810 CTC_NoKeywords, 0)) { 4811 if (R.getAsSingle<NamespaceDecl>() || 4812 R.getAsSingle<NamespaceAliasDecl>()) { 4813 if (DeclContext *DC = computeDeclContext(SS, false)) 4814 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4815 << Ident << DC << Corrected << SS.getRange() 4816 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4817 else 4818 Diag(IdentLoc, diag::err_using_directive_suggest) 4819 << Ident << Corrected 4820 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4821 4822 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4823 << Corrected; 4824 4825 Ident = Corrected.getAsIdentifierInfo(); 4826 } else { 4827 R.clear(); 4828 R.setLookupName(Ident); 4829 } 4830 } 4831 4832 if (R.empty()) { 4833 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4834 return 0; 4835 } 4836 } 4837 4838 NamespaceAliasDecl *AliasDecl = 4839 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4840 Alias, SS.getWithLocInContext(Context), 4841 IdentLoc, R.getFoundDecl()); 4842 4843 PushOnScopeChains(AliasDecl, S); 4844 return AliasDecl; 4845} 4846 4847namespace { 4848 /// \brief Scoped object used to handle the state changes required in Sema 4849 /// to implicitly define the body of a C++ member function; 4850 class ImplicitlyDefinedFunctionScope { 4851 Sema &S; 4852 Sema::ContextRAII SavedContext; 4853 4854 public: 4855 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4856 : S(S), SavedContext(S, Method) 4857 { 4858 S.PushFunctionScope(); 4859 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4860 } 4861 4862 ~ImplicitlyDefinedFunctionScope() { 4863 S.PopExpressionEvaluationContext(); 4864 S.PopFunctionOrBlockScope(); 4865 } 4866 }; 4867} 4868 4869static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4870 CXXRecordDecl *D) { 4871 ASTContext &Context = Self.Context; 4872 QualType ClassType = Context.getTypeDeclType(D); 4873 DeclarationName ConstructorName 4874 = Context.DeclarationNames.getCXXConstructorName( 4875 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4876 4877 DeclContext::lookup_const_iterator Con, ConEnd; 4878 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4879 Con != ConEnd; ++Con) { 4880 // FIXME: In C++0x, a constructor template can be a default constructor. 4881 if (isa<FunctionTemplateDecl>(*Con)) 4882 continue; 4883 4884 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4885 if (Constructor->isDefaultConstructor()) 4886 return Constructor; 4887 } 4888 return 0; 4889} 4890 4891CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4892 CXXRecordDecl *ClassDecl) { 4893 // C++ [class.ctor]p5: 4894 // A default constructor for a class X is a constructor of class X 4895 // that can be called without an argument. If there is no 4896 // user-declared constructor for class X, a default constructor is 4897 // implicitly declared. An implicitly-declared default constructor 4898 // is an inline public member of its class. 4899 assert(!ClassDecl->hasUserDeclaredConstructor() && 4900 "Should not build implicit default constructor!"); 4901 4902 // C++ [except.spec]p14: 4903 // An implicitly declared special member function (Clause 12) shall have an 4904 // exception-specification. [...] 4905 ImplicitExceptionSpecification ExceptSpec(Context); 4906 4907 // Direct base-class constructors. 4908 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4909 BEnd = ClassDecl->bases_end(); 4910 B != BEnd; ++B) { 4911 if (B->isVirtual()) // Handled below. 4912 continue; 4913 4914 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4915 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4916 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4917 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4918 else if (CXXConstructorDecl *Constructor 4919 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4920 ExceptSpec.CalledDecl(Constructor); 4921 } 4922 } 4923 4924 // Virtual base-class constructors. 4925 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4926 BEnd = ClassDecl->vbases_end(); 4927 B != BEnd; ++B) { 4928 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4929 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4930 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4931 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4932 else if (CXXConstructorDecl *Constructor 4933 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 4934 ExceptSpec.CalledDecl(Constructor); 4935 } 4936 } 4937 4938 // Field constructors. 4939 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4940 FEnd = ClassDecl->field_end(); 4941 F != FEnd; ++F) { 4942 if (const RecordType *RecordTy 4943 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4944 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4945 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4946 ExceptSpec.CalledDecl( 4947 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4948 else if (CXXConstructorDecl *Constructor 4949 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 4950 ExceptSpec.CalledDecl(Constructor); 4951 } 4952 } 4953 4954 FunctionProtoType::ExtProtoInfo EPI; 4955 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 4956 EPI.NumExceptions = ExceptSpec.size(); 4957 EPI.Exceptions = ExceptSpec.data(); 4958 4959 // Create the actual constructor declaration. 4960 CanQualType ClassType 4961 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4962 SourceLocation ClassLoc = ClassDecl->getLocation(); 4963 DeclarationName Name 4964 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4965 DeclarationNameInfo NameInfo(Name, ClassLoc); 4966 CXXConstructorDecl *DefaultCon 4967 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 4968 Context.getFunctionType(Context.VoidTy, 4969 0, 0, EPI), 4970 /*TInfo=*/0, 4971 /*isExplicit=*/false, 4972 /*isInline=*/true, 4973 /*isImplicitlyDeclared=*/true); 4974 DefaultCon->setAccess(AS_public); 4975 DefaultCon->setImplicit(); 4976 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4977 4978 // Note that we have declared this constructor. 4979 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4980 4981 if (Scope *S = getScopeForContext(ClassDecl)) 4982 PushOnScopeChains(DefaultCon, S, false); 4983 ClassDecl->addDecl(DefaultCon); 4984 4985 return DefaultCon; 4986} 4987 4988void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4989 CXXConstructorDecl *Constructor) { 4990 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4991 !Constructor->isUsed(false)) && 4992 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4993 4994 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4995 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4996 4997 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4998 DiagnosticErrorTrap Trap(Diags); 4999 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5000 Trap.hasErrorOccurred()) { 5001 Diag(CurrentLocation, diag::note_member_synthesized_at) 5002 << CXXConstructor << Context.getTagDeclType(ClassDecl); 5003 Constructor->setInvalidDecl(); 5004 return; 5005 } 5006 5007 SourceLocation Loc = Constructor->getLocation(); 5008 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5009 5010 Constructor->setUsed(); 5011 MarkVTableUsed(CurrentLocation, ClassDecl); 5012 5013 if (ASTMutationListener *L = getASTMutationListener()) { 5014 L->CompletedImplicitDefinition(Constructor); 5015 } 5016} 5017 5018void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5019 // We start with an initial pass over the base classes to collect those that 5020 // inherit constructors from. If there are none, we can forgo all further 5021 // processing. 5022 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5023 BasesVector BasesToInheritFrom; 5024 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5025 BaseE = ClassDecl->bases_end(); 5026 BaseIt != BaseE; ++BaseIt) { 5027 if (BaseIt->getInheritConstructors()) { 5028 QualType Base = BaseIt->getType(); 5029 if (Base->isDependentType()) { 5030 // If we inherit constructors from anything that is dependent, just 5031 // abort processing altogether. We'll get another chance for the 5032 // instantiations. 5033 return; 5034 } 5035 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5036 } 5037 } 5038 if (BasesToInheritFrom.empty()) 5039 return; 5040 5041 // Now collect the constructors that we already have in the current class. 5042 // Those take precedence over inherited constructors. 5043 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5044 // unless there is a user-declared constructor with the same signature in 5045 // the class where the using-declaration appears. 5046 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5047 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5048 CtorE = ClassDecl->ctor_end(); 5049 CtorIt != CtorE; ++CtorIt) { 5050 ExistingConstructors.insert( 5051 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5052 } 5053 5054 Scope *S = getScopeForContext(ClassDecl); 5055 DeclarationName CreatedCtorName = 5056 Context.DeclarationNames.getCXXConstructorName( 5057 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5058 5059 // Now comes the true work. 5060 // First, we keep a map from constructor types to the base that introduced 5061 // them. Needed for finding conflicting constructors. We also keep the 5062 // actually inserted declarations in there, for pretty diagnostics. 5063 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5064 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5065 ConstructorToSourceMap InheritedConstructors; 5066 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5067 BaseE = BasesToInheritFrom.end(); 5068 BaseIt != BaseE; ++BaseIt) { 5069 const RecordType *Base = *BaseIt; 5070 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5071 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5072 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5073 CtorE = BaseDecl->ctor_end(); 5074 CtorIt != CtorE; ++CtorIt) { 5075 // Find the using declaration for inheriting this base's constructors. 5076 DeclarationName Name = 5077 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5078 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5079 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5080 SourceLocation UsingLoc = UD ? UD->getLocation() : 5081 ClassDecl->getLocation(); 5082 5083 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5084 // from the class X named in the using-declaration consists of actual 5085 // constructors and notional constructors that result from the 5086 // transformation of defaulted parameters as follows: 5087 // - all non-template default constructors of X, and 5088 // - for each non-template constructor of X that has at least one 5089 // parameter with a default argument, the set of constructors that 5090 // results from omitting any ellipsis parameter specification and 5091 // successively omitting parameters with a default argument from the 5092 // end of the parameter-type-list. 5093 CXXConstructorDecl *BaseCtor = *CtorIt; 5094 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5095 const FunctionProtoType *BaseCtorType = 5096 BaseCtor->getType()->getAs<FunctionProtoType>(); 5097 5098 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5099 maxParams = BaseCtor->getNumParams(); 5100 params <= maxParams; ++params) { 5101 // Skip default constructors. They're never inherited. 5102 if (params == 0) 5103 continue; 5104 // Skip copy and move constructors for the same reason. 5105 if (CanBeCopyOrMove && params == 1) 5106 continue; 5107 5108 // Build up a function type for this particular constructor. 5109 // FIXME: The working paper does not consider that the exception spec 5110 // for the inheriting constructor might be larger than that of the 5111 // source. This code doesn't yet, either. 5112 const Type *NewCtorType; 5113 if (params == maxParams) 5114 NewCtorType = BaseCtorType; 5115 else { 5116 llvm::SmallVector<QualType, 16> Args; 5117 for (unsigned i = 0; i < params; ++i) { 5118 Args.push_back(BaseCtorType->getArgType(i)); 5119 } 5120 FunctionProtoType::ExtProtoInfo ExtInfo = 5121 BaseCtorType->getExtProtoInfo(); 5122 ExtInfo.Variadic = false; 5123 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5124 Args.data(), params, ExtInfo) 5125 .getTypePtr(); 5126 } 5127 const Type *CanonicalNewCtorType = 5128 Context.getCanonicalType(NewCtorType); 5129 5130 // Now that we have the type, first check if the class already has a 5131 // constructor with this signature. 5132 if (ExistingConstructors.count(CanonicalNewCtorType)) 5133 continue; 5134 5135 // Then we check if we have already declared an inherited constructor 5136 // with this signature. 5137 std::pair<ConstructorToSourceMap::iterator, bool> result = 5138 InheritedConstructors.insert(std::make_pair( 5139 CanonicalNewCtorType, 5140 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5141 if (!result.second) { 5142 // Already in the map. If it came from a different class, that's an 5143 // error. Not if it's from the same. 5144 CanQualType PreviousBase = result.first->second.first; 5145 if (CanonicalBase != PreviousBase) { 5146 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5147 const CXXConstructorDecl *PrevBaseCtor = 5148 PrevCtor->getInheritedConstructor(); 5149 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5150 5151 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5152 Diag(BaseCtor->getLocation(), 5153 diag::note_using_decl_constructor_conflict_current_ctor); 5154 Diag(PrevBaseCtor->getLocation(), 5155 diag::note_using_decl_constructor_conflict_previous_ctor); 5156 Diag(PrevCtor->getLocation(), 5157 diag::note_using_decl_constructor_conflict_previous_using); 5158 } 5159 continue; 5160 } 5161 5162 // OK, we're there, now add the constructor. 5163 // C++0x [class.inhctor]p8: [...] that would be performed by a 5164 // user-writtern inline constructor [...] 5165 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5166 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5167 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5168 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5169 /*ImplicitlyDeclared=*/true); 5170 NewCtor->setAccess(BaseCtor->getAccess()); 5171 5172 // Build up the parameter decls and add them. 5173 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5174 for (unsigned i = 0; i < params; ++i) { 5175 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5176 UsingLoc, UsingLoc, 5177 /*IdentifierInfo=*/0, 5178 BaseCtorType->getArgType(i), 5179 /*TInfo=*/0, SC_None, 5180 SC_None, /*DefaultArg=*/0)); 5181 } 5182 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5183 NewCtor->setInheritedConstructor(BaseCtor); 5184 5185 PushOnScopeChains(NewCtor, S, false); 5186 ClassDecl->addDecl(NewCtor); 5187 result.first->second.second = NewCtor; 5188 } 5189 } 5190 } 5191} 5192 5193CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5194 // C++ [class.dtor]p2: 5195 // If a class has no user-declared destructor, a destructor is 5196 // declared implicitly. An implicitly-declared destructor is an 5197 // inline public member of its class. 5198 5199 // C++ [except.spec]p14: 5200 // An implicitly declared special member function (Clause 12) shall have 5201 // an exception-specification. 5202 ImplicitExceptionSpecification ExceptSpec(Context); 5203 5204 // Direct base-class destructors. 5205 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5206 BEnd = ClassDecl->bases_end(); 5207 B != BEnd; ++B) { 5208 if (B->isVirtual()) // Handled below. 5209 continue; 5210 5211 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5212 ExceptSpec.CalledDecl( 5213 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5214 } 5215 5216 // Virtual base-class destructors. 5217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5218 BEnd = ClassDecl->vbases_end(); 5219 B != BEnd; ++B) { 5220 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5221 ExceptSpec.CalledDecl( 5222 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5223 } 5224 5225 // Field destructors. 5226 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5227 FEnd = ClassDecl->field_end(); 5228 F != FEnd; ++F) { 5229 if (const RecordType *RecordTy 5230 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5231 ExceptSpec.CalledDecl( 5232 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5233 } 5234 5235 // Create the actual destructor declaration. 5236 FunctionProtoType::ExtProtoInfo EPI; 5237 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5238 EPI.NumExceptions = ExceptSpec.size(); 5239 EPI.Exceptions = ExceptSpec.data(); 5240 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5241 5242 CanQualType ClassType 5243 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5244 SourceLocation ClassLoc = ClassDecl->getLocation(); 5245 DeclarationName Name 5246 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5247 DeclarationNameInfo NameInfo(Name, ClassLoc); 5248 CXXDestructorDecl *Destructor 5249 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5250 /*isInline=*/true, 5251 /*isImplicitlyDeclared=*/true); 5252 Destructor->setAccess(AS_public); 5253 Destructor->setImplicit(); 5254 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5255 5256 // Note that we have declared this destructor. 5257 ++ASTContext::NumImplicitDestructorsDeclared; 5258 5259 // Introduce this destructor into its scope. 5260 if (Scope *S = getScopeForContext(ClassDecl)) 5261 PushOnScopeChains(Destructor, S, false); 5262 ClassDecl->addDecl(Destructor); 5263 5264 // This could be uniqued if it ever proves significant. 5265 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5266 5267 AddOverriddenMethods(ClassDecl, Destructor); 5268 5269 return Destructor; 5270} 5271 5272void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5273 CXXDestructorDecl *Destructor) { 5274 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5275 "DefineImplicitDestructor - call it for implicit default dtor"); 5276 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5277 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5278 5279 if (Destructor->isInvalidDecl()) 5280 return; 5281 5282 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5283 5284 DiagnosticErrorTrap Trap(Diags); 5285 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5286 Destructor->getParent()); 5287 5288 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5289 Diag(CurrentLocation, diag::note_member_synthesized_at) 5290 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5291 5292 Destructor->setInvalidDecl(); 5293 return; 5294 } 5295 5296 SourceLocation Loc = Destructor->getLocation(); 5297 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5298 5299 Destructor->setUsed(); 5300 MarkVTableUsed(CurrentLocation, ClassDecl); 5301 5302 if (ASTMutationListener *L = getASTMutationListener()) { 5303 L->CompletedImplicitDefinition(Destructor); 5304 } 5305} 5306 5307/// \brief Builds a statement that copies the given entity from \p From to 5308/// \c To. 5309/// 5310/// This routine is used to copy the members of a class with an 5311/// implicitly-declared copy assignment operator. When the entities being 5312/// copied are arrays, this routine builds for loops to copy them. 5313/// 5314/// \param S The Sema object used for type-checking. 5315/// 5316/// \param Loc The location where the implicit copy is being generated. 5317/// 5318/// \param T The type of the expressions being copied. Both expressions must 5319/// have this type. 5320/// 5321/// \param To The expression we are copying to. 5322/// 5323/// \param From The expression we are copying from. 5324/// 5325/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5326/// Otherwise, it's a non-static member subobject. 5327/// 5328/// \param Depth Internal parameter recording the depth of the recursion. 5329/// 5330/// \returns A statement or a loop that copies the expressions. 5331static StmtResult 5332BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5333 Expr *To, Expr *From, 5334 bool CopyingBaseSubobject, unsigned Depth = 0) { 5335 // C++0x [class.copy]p30: 5336 // Each subobject is assigned in the manner appropriate to its type: 5337 // 5338 // - if the subobject is of class type, the copy assignment operator 5339 // for the class is used (as if by explicit qualification; that is, 5340 // ignoring any possible virtual overriding functions in more derived 5341 // classes); 5342 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5343 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5344 5345 // Look for operator=. 5346 DeclarationName Name 5347 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5348 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5349 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5350 5351 // Filter out any result that isn't a copy-assignment operator. 5352 LookupResult::Filter F = OpLookup.makeFilter(); 5353 while (F.hasNext()) { 5354 NamedDecl *D = F.next(); 5355 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5356 if (Method->isCopyAssignmentOperator()) 5357 continue; 5358 5359 F.erase(); 5360 } 5361 F.done(); 5362 5363 // Suppress the protected check (C++ [class.protected]) for each of the 5364 // assignment operators we found. This strange dance is required when 5365 // we're assigning via a base classes's copy-assignment operator. To 5366 // ensure that we're getting the right base class subobject (without 5367 // ambiguities), we need to cast "this" to that subobject type; to 5368 // ensure that we don't go through the virtual call mechanism, we need 5369 // to qualify the operator= name with the base class (see below). However, 5370 // this means that if the base class has a protected copy assignment 5371 // operator, the protected member access check will fail. So, we 5372 // rewrite "protected" access to "public" access in this case, since we 5373 // know by construction that we're calling from a derived class. 5374 if (CopyingBaseSubobject) { 5375 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5376 L != LEnd; ++L) { 5377 if (L.getAccess() == AS_protected) 5378 L.setAccess(AS_public); 5379 } 5380 } 5381 5382 // Create the nested-name-specifier that will be used to qualify the 5383 // reference to operator=; this is required to suppress the virtual 5384 // call mechanism. 5385 CXXScopeSpec SS; 5386 SS.MakeTrivial(S.Context, 5387 NestedNameSpecifier::Create(S.Context, 0, false, 5388 T.getTypePtr()), 5389 Loc); 5390 5391 // Create the reference to operator=. 5392 ExprResult OpEqualRef 5393 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5394 /*FirstQualifierInScope=*/0, OpLookup, 5395 /*TemplateArgs=*/0, 5396 /*SuppressQualifierCheck=*/true); 5397 if (OpEqualRef.isInvalid()) 5398 return StmtError(); 5399 5400 // Build the call to the assignment operator. 5401 5402 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5403 OpEqualRef.takeAs<Expr>(), 5404 Loc, &From, 1, Loc); 5405 if (Call.isInvalid()) 5406 return StmtError(); 5407 5408 return S.Owned(Call.takeAs<Stmt>()); 5409 } 5410 5411 // - if the subobject is of scalar type, the built-in assignment 5412 // operator is used. 5413 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5414 if (!ArrayTy) { 5415 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5416 if (Assignment.isInvalid()) 5417 return StmtError(); 5418 5419 return S.Owned(Assignment.takeAs<Stmt>()); 5420 } 5421 5422 // - if the subobject is an array, each element is assigned, in the 5423 // manner appropriate to the element type; 5424 5425 // Construct a loop over the array bounds, e.g., 5426 // 5427 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5428 // 5429 // that will copy each of the array elements. 5430 QualType SizeType = S.Context.getSizeType(); 5431 5432 // Create the iteration variable. 5433 IdentifierInfo *IterationVarName = 0; 5434 { 5435 llvm::SmallString<8> Str; 5436 llvm::raw_svector_ostream OS(Str); 5437 OS << "__i" << Depth; 5438 IterationVarName = &S.Context.Idents.get(OS.str()); 5439 } 5440 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5441 IterationVarName, SizeType, 5442 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5443 SC_None, SC_None); 5444 5445 // Initialize the iteration variable to zero. 5446 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5447 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5448 5449 // Create a reference to the iteration variable; we'll use this several 5450 // times throughout. 5451 Expr *IterationVarRef 5452 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5453 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5454 5455 // Create the DeclStmt that holds the iteration variable. 5456 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5457 5458 // Create the comparison against the array bound. 5459 llvm::APInt Upper 5460 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5461 Expr *Comparison 5462 = new (S.Context) BinaryOperator(IterationVarRef, 5463 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5464 BO_NE, S.Context.BoolTy, 5465 VK_RValue, OK_Ordinary, Loc); 5466 5467 // Create the pre-increment of the iteration variable. 5468 Expr *Increment 5469 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5470 VK_LValue, OK_Ordinary, Loc); 5471 5472 // Subscript the "from" and "to" expressions with the iteration variable. 5473 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5474 IterationVarRef, Loc)); 5475 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5476 IterationVarRef, Loc)); 5477 5478 // Build the copy for an individual element of the array. 5479 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5480 To, From, CopyingBaseSubobject, 5481 Depth + 1); 5482 if (Copy.isInvalid()) 5483 return StmtError(); 5484 5485 // Construct the loop that copies all elements of this array. 5486 return S.ActOnForStmt(Loc, Loc, InitStmt, 5487 S.MakeFullExpr(Comparison), 5488 0, S.MakeFullExpr(Increment), 5489 Loc, Copy.take()); 5490} 5491 5492/// \brief Determine whether the given class has a copy assignment operator 5493/// that accepts a const-qualified argument. 5494static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5495 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5496 5497 if (!Class->hasDeclaredCopyAssignment()) 5498 S.DeclareImplicitCopyAssignment(Class); 5499 5500 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5501 DeclarationName OpName 5502 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5503 5504 DeclContext::lookup_const_iterator Op, OpEnd; 5505 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5506 // C++ [class.copy]p9: 5507 // A user-declared copy assignment operator is a non-static non-template 5508 // member function of class X with exactly one parameter of type X, X&, 5509 // const X&, volatile X& or const volatile X&. 5510 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5511 if (!Method) 5512 continue; 5513 5514 if (Method->isStatic()) 5515 continue; 5516 if (Method->getPrimaryTemplate()) 5517 continue; 5518 const FunctionProtoType *FnType = 5519 Method->getType()->getAs<FunctionProtoType>(); 5520 assert(FnType && "Overloaded operator has no prototype."); 5521 // Don't assert on this; an invalid decl might have been left in the AST. 5522 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5523 continue; 5524 bool AcceptsConst = true; 5525 QualType ArgType = FnType->getArgType(0); 5526 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5527 ArgType = Ref->getPointeeType(); 5528 // Is it a non-const lvalue reference? 5529 if (!ArgType.isConstQualified()) 5530 AcceptsConst = false; 5531 } 5532 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5533 continue; 5534 5535 // We have a single argument of type cv X or cv X&, i.e. we've found the 5536 // copy assignment operator. Return whether it accepts const arguments. 5537 return AcceptsConst; 5538 } 5539 assert(Class->isInvalidDecl() && 5540 "No copy assignment operator declared in valid code."); 5541 return false; 5542} 5543 5544CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5545 // Note: The following rules are largely analoguous to the copy 5546 // constructor rules. Note that virtual bases are not taken into account 5547 // for determining the argument type of the operator. Note also that 5548 // operators taking an object instead of a reference are allowed. 5549 5550 5551 // C++ [class.copy]p10: 5552 // If the class definition does not explicitly declare a copy 5553 // assignment operator, one is declared implicitly. 5554 // The implicitly-defined copy assignment operator for a class X 5555 // will have the form 5556 // 5557 // X& X::operator=(const X&) 5558 // 5559 // if 5560 bool HasConstCopyAssignment = true; 5561 5562 // -- each direct base class B of X has a copy assignment operator 5563 // whose parameter is of type const B&, const volatile B& or B, 5564 // and 5565 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5566 BaseEnd = ClassDecl->bases_end(); 5567 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5568 assert(!Base->getType()->isDependentType() && 5569 "Cannot generate implicit members for class with dependent bases."); 5570 const CXXRecordDecl *BaseClassDecl 5571 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5572 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5573 } 5574 5575 // -- for all the nonstatic data members of X that are of a class 5576 // type M (or array thereof), each such class type has a copy 5577 // assignment operator whose parameter is of type const M&, 5578 // const volatile M& or M. 5579 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5580 FieldEnd = ClassDecl->field_end(); 5581 HasConstCopyAssignment && Field != FieldEnd; 5582 ++Field) { 5583 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5584 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5585 const CXXRecordDecl *FieldClassDecl 5586 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5587 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5588 } 5589 } 5590 5591 // Otherwise, the implicitly declared copy assignment operator will 5592 // have the form 5593 // 5594 // X& X::operator=(X&) 5595 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5596 QualType RetType = Context.getLValueReferenceType(ArgType); 5597 if (HasConstCopyAssignment) 5598 ArgType = ArgType.withConst(); 5599 ArgType = Context.getLValueReferenceType(ArgType); 5600 5601 // C++ [except.spec]p14: 5602 // An implicitly declared special member function (Clause 12) shall have an 5603 // exception-specification. [...] 5604 ImplicitExceptionSpecification ExceptSpec(Context); 5605 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5606 BaseEnd = ClassDecl->bases_end(); 5607 Base != BaseEnd; ++Base) { 5608 CXXRecordDecl *BaseClassDecl 5609 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5610 5611 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5612 DeclareImplicitCopyAssignment(BaseClassDecl); 5613 5614 if (CXXMethodDecl *CopyAssign 5615 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5616 ExceptSpec.CalledDecl(CopyAssign); 5617 } 5618 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5619 FieldEnd = ClassDecl->field_end(); 5620 Field != FieldEnd; 5621 ++Field) { 5622 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5623 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5624 CXXRecordDecl *FieldClassDecl 5625 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5626 5627 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5628 DeclareImplicitCopyAssignment(FieldClassDecl); 5629 5630 if (CXXMethodDecl *CopyAssign 5631 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5632 ExceptSpec.CalledDecl(CopyAssign); 5633 } 5634 } 5635 5636 // An implicitly-declared copy assignment operator is an inline public 5637 // member of its class. 5638 FunctionProtoType::ExtProtoInfo EPI; 5639 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5640 EPI.NumExceptions = ExceptSpec.size(); 5641 EPI.Exceptions = ExceptSpec.data(); 5642 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5643 SourceLocation ClassLoc = ClassDecl->getLocation(); 5644 DeclarationNameInfo NameInfo(Name, ClassLoc); 5645 CXXMethodDecl *CopyAssignment 5646 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5647 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5648 /*TInfo=*/0, /*isStatic=*/false, 5649 /*StorageClassAsWritten=*/SC_None, 5650 /*isInline=*/true, 5651 SourceLocation()); 5652 CopyAssignment->setAccess(AS_public); 5653 CopyAssignment->setImplicit(); 5654 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5655 5656 // Add the parameter to the operator. 5657 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5658 ClassLoc, ClassLoc, /*Id=*/0, 5659 ArgType, /*TInfo=*/0, 5660 SC_None, 5661 SC_None, 0); 5662 CopyAssignment->setParams(&FromParam, 1); 5663 5664 // Note that we have added this copy-assignment operator. 5665 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5666 5667 if (Scope *S = getScopeForContext(ClassDecl)) 5668 PushOnScopeChains(CopyAssignment, S, false); 5669 ClassDecl->addDecl(CopyAssignment); 5670 5671 AddOverriddenMethods(ClassDecl, CopyAssignment); 5672 return CopyAssignment; 5673} 5674 5675void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5676 CXXMethodDecl *CopyAssignOperator) { 5677 assert((CopyAssignOperator->isImplicit() && 5678 CopyAssignOperator->isOverloadedOperator() && 5679 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5680 !CopyAssignOperator->isUsed(false)) && 5681 "DefineImplicitCopyAssignment called for wrong function"); 5682 5683 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5684 5685 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5686 CopyAssignOperator->setInvalidDecl(); 5687 return; 5688 } 5689 5690 CopyAssignOperator->setUsed(); 5691 5692 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5693 DiagnosticErrorTrap Trap(Diags); 5694 5695 // C++0x [class.copy]p30: 5696 // The implicitly-defined or explicitly-defaulted copy assignment operator 5697 // for a non-union class X performs memberwise copy assignment of its 5698 // subobjects. The direct base classes of X are assigned first, in the 5699 // order of their declaration in the base-specifier-list, and then the 5700 // immediate non-static data members of X are assigned, in the order in 5701 // which they were declared in the class definition. 5702 5703 // The statements that form the synthesized function body. 5704 ASTOwningVector<Stmt*> Statements(*this); 5705 5706 // The parameter for the "other" object, which we are copying from. 5707 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5708 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5709 QualType OtherRefType = Other->getType(); 5710 if (const LValueReferenceType *OtherRef 5711 = OtherRefType->getAs<LValueReferenceType>()) { 5712 OtherRefType = OtherRef->getPointeeType(); 5713 OtherQuals = OtherRefType.getQualifiers(); 5714 } 5715 5716 // Our location for everything implicitly-generated. 5717 SourceLocation Loc = CopyAssignOperator->getLocation(); 5718 5719 // Construct a reference to the "other" object. We'll be using this 5720 // throughout the generated ASTs. 5721 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5722 assert(OtherRef && "Reference to parameter cannot fail!"); 5723 5724 // Construct the "this" pointer. We'll be using this throughout the generated 5725 // ASTs. 5726 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5727 assert(This && "Reference to this cannot fail!"); 5728 5729 // Assign base classes. 5730 bool Invalid = false; 5731 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5732 E = ClassDecl->bases_end(); Base != E; ++Base) { 5733 // Form the assignment: 5734 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5735 QualType BaseType = Base->getType().getUnqualifiedType(); 5736 if (!BaseType->isRecordType()) { 5737 Invalid = true; 5738 continue; 5739 } 5740 5741 CXXCastPath BasePath; 5742 BasePath.push_back(Base); 5743 5744 // Construct the "from" expression, which is an implicit cast to the 5745 // appropriately-qualified base type. 5746 Expr *From = OtherRef; 5747 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5748 CK_UncheckedDerivedToBase, 5749 VK_LValue, &BasePath).take(); 5750 5751 // Dereference "this". 5752 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5753 5754 // Implicitly cast "this" to the appropriately-qualified base type. 5755 To = ImpCastExprToType(To.take(), 5756 Context.getCVRQualifiedType(BaseType, 5757 CopyAssignOperator->getTypeQualifiers()), 5758 CK_UncheckedDerivedToBase, 5759 VK_LValue, &BasePath); 5760 5761 // Build the copy. 5762 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5763 To.get(), From, 5764 /*CopyingBaseSubobject=*/true); 5765 if (Copy.isInvalid()) { 5766 Diag(CurrentLocation, diag::note_member_synthesized_at) 5767 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5768 CopyAssignOperator->setInvalidDecl(); 5769 return; 5770 } 5771 5772 // Success! Record the copy. 5773 Statements.push_back(Copy.takeAs<Expr>()); 5774 } 5775 5776 // \brief Reference to the __builtin_memcpy function. 5777 Expr *BuiltinMemCpyRef = 0; 5778 // \brief Reference to the __builtin_objc_memmove_collectable function. 5779 Expr *CollectableMemCpyRef = 0; 5780 5781 // Assign non-static members. 5782 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5783 FieldEnd = ClassDecl->field_end(); 5784 Field != FieldEnd; ++Field) { 5785 // Check for members of reference type; we can't copy those. 5786 if (Field->getType()->isReferenceType()) { 5787 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5788 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5789 Diag(Field->getLocation(), diag::note_declared_at); 5790 Diag(CurrentLocation, diag::note_member_synthesized_at) 5791 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5792 Invalid = true; 5793 continue; 5794 } 5795 5796 // Check for members of const-qualified, non-class type. 5797 QualType BaseType = Context.getBaseElementType(Field->getType()); 5798 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5799 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5800 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5801 Diag(Field->getLocation(), diag::note_declared_at); 5802 Diag(CurrentLocation, diag::note_member_synthesized_at) 5803 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5804 Invalid = true; 5805 continue; 5806 } 5807 5808 QualType FieldType = Field->getType().getNonReferenceType(); 5809 if (FieldType->isIncompleteArrayType()) { 5810 assert(ClassDecl->hasFlexibleArrayMember() && 5811 "Incomplete array type is not valid"); 5812 continue; 5813 } 5814 5815 // Build references to the field in the object we're copying from and to. 5816 CXXScopeSpec SS; // Intentionally empty 5817 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5818 LookupMemberName); 5819 MemberLookup.addDecl(*Field); 5820 MemberLookup.resolveKind(); 5821 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5822 Loc, /*IsArrow=*/false, 5823 SS, 0, MemberLookup, 0); 5824 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5825 Loc, /*IsArrow=*/true, 5826 SS, 0, MemberLookup, 0); 5827 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5828 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5829 5830 // If the field should be copied with __builtin_memcpy rather than via 5831 // explicit assignments, do so. This optimization only applies for arrays 5832 // of scalars and arrays of class type with trivial copy-assignment 5833 // operators. 5834 if (FieldType->isArrayType() && 5835 (!BaseType->isRecordType() || 5836 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5837 ->hasTrivialCopyAssignment())) { 5838 // Compute the size of the memory buffer to be copied. 5839 QualType SizeType = Context.getSizeType(); 5840 llvm::APInt Size(Context.getTypeSize(SizeType), 5841 Context.getTypeSizeInChars(BaseType).getQuantity()); 5842 for (const ConstantArrayType *Array 5843 = Context.getAsConstantArrayType(FieldType); 5844 Array; 5845 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5846 llvm::APInt ArraySize 5847 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5848 Size *= ArraySize; 5849 } 5850 5851 // Take the address of the field references for "from" and "to". 5852 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5853 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5854 5855 bool NeedsCollectableMemCpy = 5856 (BaseType->isRecordType() && 5857 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5858 5859 if (NeedsCollectableMemCpy) { 5860 if (!CollectableMemCpyRef) { 5861 // Create a reference to the __builtin_objc_memmove_collectable function. 5862 LookupResult R(*this, 5863 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5864 Loc, LookupOrdinaryName); 5865 LookupName(R, TUScope, true); 5866 5867 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5868 if (!CollectableMemCpy) { 5869 // Something went horribly wrong earlier, and we will have 5870 // complained about it. 5871 Invalid = true; 5872 continue; 5873 } 5874 5875 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5876 CollectableMemCpy->getType(), 5877 VK_LValue, Loc, 0).take(); 5878 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5879 } 5880 } 5881 // Create a reference to the __builtin_memcpy builtin function. 5882 else if (!BuiltinMemCpyRef) { 5883 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5884 LookupOrdinaryName); 5885 LookupName(R, TUScope, true); 5886 5887 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5888 if (!BuiltinMemCpy) { 5889 // Something went horribly wrong earlier, and we will have complained 5890 // about it. 5891 Invalid = true; 5892 continue; 5893 } 5894 5895 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5896 BuiltinMemCpy->getType(), 5897 VK_LValue, Loc, 0).take(); 5898 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5899 } 5900 5901 ASTOwningVector<Expr*> CallArgs(*this); 5902 CallArgs.push_back(To.takeAs<Expr>()); 5903 CallArgs.push_back(From.takeAs<Expr>()); 5904 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5905 ExprResult Call = ExprError(); 5906 if (NeedsCollectableMemCpy) 5907 Call = ActOnCallExpr(/*Scope=*/0, 5908 CollectableMemCpyRef, 5909 Loc, move_arg(CallArgs), 5910 Loc); 5911 else 5912 Call = ActOnCallExpr(/*Scope=*/0, 5913 BuiltinMemCpyRef, 5914 Loc, move_arg(CallArgs), 5915 Loc); 5916 5917 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5918 Statements.push_back(Call.takeAs<Expr>()); 5919 continue; 5920 } 5921 5922 // Build the copy of this field. 5923 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5924 To.get(), From.get(), 5925 /*CopyingBaseSubobject=*/false); 5926 if (Copy.isInvalid()) { 5927 Diag(CurrentLocation, diag::note_member_synthesized_at) 5928 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5929 CopyAssignOperator->setInvalidDecl(); 5930 return; 5931 } 5932 5933 // Success! Record the copy. 5934 Statements.push_back(Copy.takeAs<Stmt>()); 5935 } 5936 5937 if (!Invalid) { 5938 // Add a "return *this;" 5939 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5940 5941 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5942 if (Return.isInvalid()) 5943 Invalid = true; 5944 else { 5945 Statements.push_back(Return.takeAs<Stmt>()); 5946 5947 if (Trap.hasErrorOccurred()) { 5948 Diag(CurrentLocation, diag::note_member_synthesized_at) 5949 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5950 Invalid = true; 5951 } 5952 } 5953 } 5954 5955 if (Invalid) { 5956 CopyAssignOperator->setInvalidDecl(); 5957 return; 5958 } 5959 5960 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5961 /*isStmtExpr=*/false); 5962 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5963 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5964 5965 if (ASTMutationListener *L = getASTMutationListener()) { 5966 L->CompletedImplicitDefinition(CopyAssignOperator); 5967 } 5968} 5969 5970CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5971 CXXRecordDecl *ClassDecl) { 5972 // C++ [class.copy]p4: 5973 // If the class definition does not explicitly declare a copy 5974 // constructor, one is declared implicitly. 5975 5976 // C++ [class.copy]p5: 5977 // The implicitly-declared copy constructor for a class X will 5978 // have the form 5979 // 5980 // X::X(const X&) 5981 // 5982 // if 5983 bool HasConstCopyConstructor = true; 5984 5985 // -- each direct or virtual base class B of X has a copy 5986 // constructor whose first parameter is of type const B& or 5987 // const volatile B&, and 5988 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5989 BaseEnd = ClassDecl->bases_end(); 5990 HasConstCopyConstructor && Base != BaseEnd; 5991 ++Base) { 5992 // Virtual bases are handled below. 5993 if (Base->isVirtual()) 5994 continue; 5995 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 (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6006 BaseEnd = ClassDecl->vbases_end(); 6007 HasConstCopyConstructor && Base != BaseEnd; 6008 ++Base) { 6009 CXXRecordDecl *BaseClassDecl 6010 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6011 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6012 DeclareImplicitCopyConstructor(BaseClassDecl); 6013 6014 HasConstCopyConstructor 6015 = BaseClassDecl->hasConstCopyConstructor(Context); 6016 } 6017 6018 // -- for all the nonstatic data members of X that are of a 6019 // class type M (or array thereof), each such class type 6020 // has a copy constructor whose first parameter is of type 6021 // const M& or const volatile M&. 6022 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6023 FieldEnd = ClassDecl->field_end(); 6024 HasConstCopyConstructor && Field != FieldEnd; 6025 ++Field) { 6026 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6027 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6028 CXXRecordDecl *FieldClassDecl 6029 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6030 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6031 DeclareImplicitCopyConstructor(FieldClassDecl); 6032 6033 HasConstCopyConstructor 6034 = FieldClassDecl->hasConstCopyConstructor(Context); 6035 } 6036 } 6037 6038 // Otherwise, the implicitly declared copy constructor will have 6039 // the form 6040 // 6041 // X::X(X&) 6042 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6043 QualType ArgType = ClassType; 6044 if (HasConstCopyConstructor) 6045 ArgType = ArgType.withConst(); 6046 ArgType = Context.getLValueReferenceType(ArgType); 6047 6048 // C++ [except.spec]p14: 6049 // An implicitly declared special member function (Clause 12) shall have an 6050 // exception-specification. [...] 6051 ImplicitExceptionSpecification ExceptSpec(Context); 6052 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6053 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6054 BaseEnd = ClassDecl->bases_end(); 6055 Base != BaseEnd; 6056 ++Base) { 6057 // Virtual bases are handled below. 6058 if (Base->isVirtual()) 6059 continue; 6060 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::base_class_iterator Base = ClassDecl->vbases_begin(), 6071 BaseEnd = ClassDecl->vbases_end(); 6072 Base != BaseEnd; 6073 ++Base) { 6074 CXXRecordDecl *BaseClassDecl 6075 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6076 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6077 DeclareImplicitCopyConstructor(BaseClassDecl); 6078 6079 if (CXXConstructorDecl *CopyConstructor 6080 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6081 ExceptSpec.CalledDecl(CopyConstructor); 6082 } 6083 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6084 FieldEnd = ClassDecl->field_end(); 6085 Field != FieldEnd; 6086 ++Field) { 6087 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6088 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6089 CXXRecordDecl *FieldClassDecl 6090 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6091 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6092 DeclareImplicitCopyConstructor(FieldClassDecl); 6093 6094 if (CXXConstructorDecl *CopyConstructor 6095 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6096 ExceptSpec.CalledDecl(CopyConstructor); 6097 } 6098 } 6099 6100 // An implicitly-declared copy constructor is an inline public 6101 // member of its class. 6102 FunctionProtoType::ExtProtoInfo EPI; 6103 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6104 EPI.NumExceptions = ExceptSpec.size(); 6105 EPI.Exceptions = ExceptSpec.data(); 6106 DeclarationName Name 6107 = Context.DeclarationNames.getCXXConstructorName( 6108 Context.getCanonicalType(ClassType)); 6109 SourceLocation ClassLoc = ClassDecl->getLocation(); 6110 DeclarationNameInfo NameInfo(Name, ClassLoc); 6111 CXXConstructorDecl *CopyConstructor 6112 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6113 Context.getFunctionType(Context.VoidTy, 6114 &ArgType, 1, EPI), 6115 /*TInfo=*/0, 6116 /*isExplicit=*/false, 6117 /*isInline=*/true, 6118 /*isImplicitlyDeclared=*/true); 6119 CopyConstructor->setAccess(AS_public); 6120 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6121 6122 // Note that we have declared this constructor. 6123 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6124 6125 // Add the parameter to the constructor. 6126 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6127 ClassLoc, ClassLoc, 6128 /*IdentifierInfo=*/0, 6129 ArgType, /*TInfo=*/0, 6130 SC_None, 6131 SC_None, 0); 6132 CopyConstructor->setParams(&FromParam, 1); 6133 if (Scope *S = getScopeForContext(ClassDecl)) 6134 PushOnScopeChains(CopyConstructor, S, false); 6135 ClassDecl->addDecl(CopyConstructor); 6136 6137 return CopyConstructor; 6138} 6139 6140void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6141 CXXConstructorDecl *CopyConstructor, 6142 unsigned TypeQuals) { 6143 assert((CopyConstructor->isImplicit() && 6144 CopyConstructor->isCopyConstructor(TypeQuals) && 6145 !CopyConstructor->isUsed(false)) && 6146 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6147 6148 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6149 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6150 6151 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6152 DiagnosticErrorTrap Trap(Diags); 6153 6154 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6155 Trap.hasErrorOccurred()) { 6156 Diag(CurrentLocation, diag::note_member_synthesized_at) 6157 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6158 CopyConstructor->setInvalidDecl(); 6159 } else { 6160 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6161 CopyConstructor->getLocation(), 6162 MultiStmtArg(*this, 0, 0), 6163 /*isStmtExpr=*/false) 6164 .takeAs<Stmt>()); 6165 } 6166 6167 CopyConstructor->setUsed(); 6168 6169 if (ASTMutationListener *L = getASTMutationListener()) { 6170 L->CompletedImplicitDefinition(CopyConstructor); 6171 } 6172} 6173 6174ExprResult 6175Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6176 CXXConstructorDecl *Constructor, 6177 MultiExprArg ExprArgs, 6178 bool RequiresZeroInit, 6179 unsigned ConstructKind, 6180 SourceRange ParenRange) { 6181 bool Elidable = false; 6182 6183 // C++0x [class.copy]p34: 6184 // When certain criteria are met, an implementation is allowed to 6185 // omit the copy/move construction of a class object, even if the 6186 // copy/move constructor and/or destructor for the object have 6187 // side effects. [...] 6188 // - when a temporary class object that has not been bound to a 6189 // reference (12.2) would be copied/moved to a class object 6190 // with the same cv-unqualified type, the copy/move operation 6191 // can be omitted by constructing the temporary object 6192 // directly into the target of the omitted copy/move 6193 if (ConstructKind == CXXConstructExpr::CK_Complete && 6194 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6195 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6196 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6197 } 6198 6199 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6200 Elidable, move(ExprArgs), RequiresZeroInit, 6201 ConstructKind, ParenRange); 6202} 6203 6204/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6205/// including handling of its default argument expressions. 6206ExprResult 6207Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6208 CXXConstructorDecl *Constructor, bool Elidable, 6209 MultiExprArg ExprArgs, 6210 bool RequiresZeroInit, 6211 unsigned ConstructKind, 6212 SourceRange ParenRange) { 6213 unsigned NumExprs = ExprArgs.size(); 6214 Expr **Exprs = (Expr **)ExprArgs.release(); 6215 6216 for (specific_attr_iterator<NonNullAttr> 6217 i = Constructor->specific_attr_begin<NonNullAttr>(), 6218 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6219 const NonNullAttr *NonNull = *i; 6220 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6221 } 6222 6223 MarkDeclarationReferenced(ConstructLoc, Constructor); 6224 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6225 Constructor, Elidable, Exprs, NumExprs, 6226 RequiresZeroInit, 6227 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6228 ParenRange)); 6229} 6230 6231bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6232 CXXConstructorDecl *Constructor, 6233 MultiExprArg Exprs) { 6234 // FIXME: Provide the correct paren SourceRange when available. 6235 ExprResult TempResult = 6236 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6237 move(Exprs), false, CXXConstructExpr::CK_Complete, 6238 SourceRange()); 6239 if (TempResult.isInvalid()) 6240 return true; 6241 6242 Expr *Temp = TempResult.takeAs<Expr>(); 6243 CheckImplicitConversions(Temp, VD->getLocation()); 6244 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6245 Temp = MaybeCreateExprWithCleanups(Temp); 6246 VD->setInit(Temp); 6247 6248 return false; 6249} 6250 6251void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6252 if (VD->isInvalidDecl()) return; 6253 6254 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6255 if (ClassDecl->isInvalidDecl()) return; 6256 if (ClassDecl->hasTrivialDestructor()) return; 6257 if (ClassDecl->isDependentContext()) return; 6258 6259 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6260 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6261 CheckDestructorAccess(VD->getLocation(), Destructor, 6262 PDiag(diag::err_access_dtor_var) 6263 << VD->getDeclName() 6264 << VD->getType()); 6265 6266 if (!VD->hasGlobalStorage()) return; 6267 6268 // Emit warning for non-trivial dtor in global scope (a real global, 6269 // class-static, function-static). 6270 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6271 6272 // TODO: this should be re-enabled for static locals by !CXAAtExit 6273 if (!VD->isStaticLocal()) 6274 Diag(VD->getLocation(), diag::warn_global_destructor); 6275} 6276 6277/// AddCXXDirectInitializerToDecl - This action is called immediately after 6278/// ActOnDeclarator, when a C++ direct initializer is present. 6279/// e.g: "int x(1);" 6280void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6281 SourceLocation LParenLoc, 6282 MultiExprArg Exprs, 6283 SourceLocation RParenLoc, 6284 bool TypeMayContainAuto) { 6285 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6286 6287 // If there is no declaration, there was an error parsing it. Just ignore 6288 // the initializer. 6289 if (RealDecl == 0) 6290 return; 6291 6292 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6293 if (!VDecl) { 6294 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6295 RealDecl->setInvalidDecl(); 6296 return; 6297 } 6298 6299 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6300 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6301 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6302 if (Exprs.size() > 1) { 6303 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6304 diag::err_auto_var_init_multiple_expressions) 6305 << VDecl->getDeclName() << VDecl->getType() 6306 << VDecl->getSourceRange(); 6307 RealDecl->setInvalidDecl(); 6308 return; 6309 } 6310 6311 Expr *Init = Exprs.get()[0]; 6312 TypeSourceInfo *DeducedType = 0; 6313 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6314 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6315 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6316 << Init->getSourceRange(); 6317 if (!DeducedType) { 6318 RealDecl->setInvalidDecl(); 6319 return; 6320 } 6321 VDecl->setTypeSourceInfo(DeducedType); 6322 VDecl->setType(DeducedType->getType()); 6323 6324 // If this is a redeclaration, check that the type we just deduced matches 6325 // the previously declared type. 6326 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6327 MergeVarDeclTypes(VDecl, Old); 6328 } 6329 6330 // We will represent direct-initialization similarly to copy-initialization: 6331 // int x(1); -as-> int x = 1; 6332 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6333 // 6334 // Clients that want to distinguish between the two forms, can check for 6335 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6336 // A major benefit is that clients that don't particularly care about which 6337 // exactly form was it (like the CodeGen) can handle both cases without 6338 // special case code. 6339 6340 // C++ 8.5p11: 6341 // The form of initialization (using parentheses or '=') is generally 6342 // insignificant, but does matter when the entity being initialized has a 6343 // class type. 6344 6345 if (!VDecl->getType()->isDependentType() && 6346 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6347 diag::err_typecheck_decl_incomplete_type)) { 6348 VDecl->setInvalidDecl(); 6349 return; 6350 } 6351 6352 // The variable can not have an abstract class type. 6353 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6354 diag::err_abstract_type_in_decl, 6355 AbstractVariableType)) 6356 VDecl->setInvalidDecl(); 6357 6358 const VarDecl *Def; 6359 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6360 Diag(VDecl->getLocation(), diag::err_redefinition) 6361 << VDecl->getDeclName(); 6362 Diag(Def->getLocation(), diag::note_previous_definition); 6363 VDecl->setInvalidDecl(); 6364 return; 6365 } 6366 6367 // C++ [class.static.data]p4 6368 // If a static data member is of const integral or const 6369 // enumeration type, its declaration in the class definition can 6370 // specify a constant-initializer which shall be an integral 6371 // constant expression (5.19). In that case, the member can appear 6372 // in integral constant expressions. The member shall still be 6373 // defined in a namespace scope if it is used in the program and the 6374 // namespace scope definition shall not contain an initializer. 6375 // 6376 // We already performed a redefinition check above, but for static 6377 // data members we also need to check whether there was an in-class 6378 // declaration with an initializer. 6379 const VarDecl* PrevInit = 0; 6380 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6381 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6382 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6383 return; 6384 } 6385 6386 bool IsDependent = false; 6387 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6388 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6389 VDecl->setInvalidDecl(); 6390 return; 6391 } 6392 6393 if (Exprs.get()[I]->isTypeDependent()) 6394 IsDependent = true; 6395 } 6396 6397 // If either the declaration has a dependent type or if any of the 6398 // expressions is type-dependent, we represent the initialization 6399 // via a ParenListExpr for later use during template instantiation. 6400 if (VDecl->getType()->isDependentType() || IsDependent) { 6401 // Let clients know that initialization was done with a direct initializer. 6402 VDecl->setCXXDirectInitializer(true); 6403 6404 // Store the initialization expressions as a ParenListExpr. 6405 unsigned NumExprs = Exprs.size(); 6406 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6407 (Expr **)Exprs.release(), 6408 NumExprs, RParenLoc)); 6409 return; 6410 } 6411 6412 // Capture the variable that is being initialized and the style of 6413 // initialization. 6414 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6415 6416 // FIXME: Poor source location information. 6417 InitializationKind Kind 6418 = InitializationKind::CreateDirect(VDecl->getLocation(), 6419 LParenLoc, RParenLoc); 6420 6421 InitializationSequence InitSeq(*this, Entity, Kind, 6422 Exprs.get(), Exprs.size()); 6423 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6424 if (Result.isInvalid()) { 6425 VDecl->setInvalidDecl(); 6426 return; 6427 } 6428 6429 CheckImplicitConversions(Result.get(), LParenLoc); 6430 6431 Result = MaybeCreateExprWithCleanups(Result); 6432 VDecl->setInit(Result.takeAs<Expr>()); 6433 VDecl->setCXXDirectInitializer(true); 6434 6435 CheckCompleteVariableDeclaration(VDecl); 6436} 6437 6438/// \brief Given a constructor and the set of arguments provided for the 6439/// constructor, convert the arguments and add any required default arguments 6440/// to form a proper call to this constructor. 6441/// 6442/// \returns true if an error occurred, false otherwise. 6443bool 6444Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6445 MultiExprArg ArgsPtr, 6446 SourceLocation Loc, 6447 ASTOwningVector<Expr*> &ConvertedArgs) { 6448 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6449 unsigned NumArgs = ArgsPtr.size(); 6450 Expr **Args = (Expr **)ArgsPtr.get(); 6451 6452 const FunctionProtoType *Proto 6453 = Constructor->getType()->getAs<FunctionProtoType>(); 6454 assert(Proto && "Constructor without a prototype?"); 6455 unsigned NumArgsInProto = Proto->getNumArgs(); 6456 6457 // If too few arguments are available, we'll fill in the rest with defaults. 6458 if (NumArgs < NumArgsInProto) 6459 ConvertedArgs.reserve(NumArgsInProto); 6460 else 6461 ConvertedArgs.reserve(NumArgs); 6462 6463 VariadicCallType CallType = 6464 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6465 llvm::SmallVector<Expr *, 8> AllArgs; 6466 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6467 Proto, 0, Args, NumArgs, AllArgs, 6468 CallType); 6469 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6470 ConvertedArgs.push_back(AllArgs[i]); 6471 return Invalid; 6472} 6473 6474static inline bool 6475CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6476 const FunctionDecl *FnDecl) { 6477 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6478 if (isa<NamespaceDecl>(DC)) { 6479 return SemaRef.Diag(FnDecl->getLocation(), 6480 diag::err_operator_new_delete_declared_in_namespace) 6481 << FnDecl->getDeclName(); 6482 } 6483 6484 if (isa<TranslationUnitDecl>(DC) && 6485 FnDecl->getStorageClass() == SC_Static) { 6486 return SemaRef.Diag(FnDecl->getLocation(), 6487 diag::err_operator_new_delete_declared_static) 6488 << FnDecl->getDeclName(); 6489 } 6490 6491 return false; 6492} 6493 6494static inline bool 6495CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6496 CanQualType ExpectedResultType, 6497 CanQualType ExpectedFirstParamType, 6498 unsigned DependentParamTypeDiag, 6499 unsigned InvalidParamTypeDiag) { 6500 QualType ResultType = 6501 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6502 6503 // Check that the result type is not dependent. 6504 if (ResultType->isDependentType()) 6505 return SemaRef.Diag(FnDecl->getLocation(), 6506 diag::err_operator_new_delete_dependent_result_type) 6507 << FnDecl->getDeclName() << ExpectedResultType; 6508 6509 // Check that the result type is what we expect. 6510 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6511 return SemaRef.Diag(FnDecl->getLocation(), 6512 diag::err_operator_new_delete_invalid_result_type) 6513 << FnDecl->getDeclName() << ExpectedResultType; 6514 6515 // A function template must have at least 2 parameters. 6516 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6517 return SemaRef.Diag(FnDecl->getLocation(), 6518 diag::err_operator_new_delete_template_too_few_parameters) 6519 << FnDecl->getDeclName(); 6520 6521 // The function decl must have at least 1 parameter. 6522 if (FnDecl->getNumParams() == 0) 6523 return SemaRef.Diag(FnDecl->getLocation(), 6524 diag::err_operator_new_delete_too_few_parameters) 6525 << FnDecl->getDeclName(); 6526 6527 // Check the the first parameter type is not dependent. 6528 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6529 if (FirstParamType->isDependentType()) 6530 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6531 << FnDecl->getDeclName() << ExpectedFirstParamType; 6532 6533 // Check that the first parameter type is what we expect. 6534 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6535 ExpectedFirstParamType) 6536 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6537 << FnDecl->getDeclName() << ExpectedFirstParamType; 6538 6539 return false; 6540} 6541 6542static bool 6543CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6544 // C++ [basic.stc.dynamic.allocation]p1: 6545 // A program is ill-formed if an allocation function is declared in a 6546 // namespace scope other than global scope or declared static in global 6547 // scope. 6548 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6549 return true; 6550 6551 CanQualType SizeTy = 6552 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6553 6554 // C++ [basic.stc.dynamic.allocation]p1: 6555 // The return type shall be void*. The first parameter shall have type 6556 // std::size_t. 6557 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6558 SizeTy, 6559 diag::err_operator_new_dependent_param_type, 6560 diag::err_operator_new_param_type)) 6561 return true; 6562 6563 // C++ [basic.stc.dynamic.allocation]p1: 6564 // The first parameter shall not have an associated default argument. 6565 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6566 return SemaRef.Diag(FnDecl->getLocation(), 6567 diag::err_operator_new_default_arg) 6568 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6569 6570 return false; 6571} 6572 6573static bool 6574CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6575 // C++ [basic.stc.dynamic.deallocation]p1: 6576 // A program is ill-formed if deallocation functions are declared in a 6577 // namespace scope other than global scope or declared static in global 6578 // scope. 6579 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6580 return true; 6581 6582 // C++ [basic.stc.dynamic.deallocation]p2: 6583 // Each deallocation function shall return void and its first parameter 6584 // shall be void*. 6585 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6586 SemaRef.Context.VoidPtrTy, 6587 diag::err_operator_delete_dependent_param_type, 6588 diag::err_operator_delete_param_type)) 6589 return true; 6590 6591 return false; 6592} 6593 6594/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6595/// of this overloaded operator is well-formed. If so, returns false; 6596/// otherwise, emits appropriate diagnostics and returns true. 6597bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6598 assert(FnDecl && FnDecl->isOverloadedOperator() && 6599 "Expected an overloaded operator declaration"); 6600 6601 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6602 6603 // C++ [over.oper]p5: 6604 // The allocation and deallocation functions, operator new, 6605 // operator new[], operator delete and operator delete[], are 6606 // described completely in 3.7.3. The attributes and restrictions 6607 // found in the rest of this subclause do not apply to them unless 6608 // explicitly stated in 3.7.3. 6609 if (Op == OO_Delete || Op == OO_Array_Delete) 6610 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6611 6612 if (Op == OO_New || Op == OO_Array_New) 6613 return CheckOperatorNewDeclaration(*this, FnDecl); 6614 6615 // C++ [over.oper]p6: 6616 // An operator function shall either be a non-static member 6617 // function or be a non-member function and have at least one 6618 // parameter whose type is a class, a reference to a class, an 6619 // enumeration, or a reference to an enumeration. 6620 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6621 if (MethodDecl->isStatic()) 6622 return Diag(FnDecl->getLocation(), 6623 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6624 } else { 6625 bool ClassOrEnumParam = false; 6626 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6627 ParamEnd = FnDecl->param_end(); 6628 Param != ParamEnd; ++Param) { 6629 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6630 if (ParamType->isDependentType() || ParamType->isRecordType() || 6631 ParamType->isEnumeralType()) { 6632 ClassOrEnumParam = true; 6633 break; 6634 } 6635 } 6636 6637 if (!ClassOrEnumParam) 6638 return Diag(FnDecl->getLocation(), 6639 diag::err_operator_overload_needs_class_or_enum) 6640 << FnDecl->getDeclName(); 6641 } 6642 6643 // C++ [over.oper]p8: 6644 // An operator function cannot have default arguments (8.3.6), 6645 // except where explicitly stated below. 6646 // 6647 // Only the function-call operator allows default arguments 6648 // (C++ [over.call]p1). 6649 if (Op != OO_Call) { 6650 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6651 Param != FnDecl->param_end(); ++Param) { 6652 if ((*Param)->hasDefaultArg()) 6653 return Diag((*Param)->getLocation(), 6654 diag::err_operator_overload_default_arg) 6655 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6656 } 6657 } 6658 6659 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6660 { false, false, false } 6661#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6662 , { Unary, Binary, MemberOnly } 6663#include "clang/Basic/OperatorKinds.def" 6664 }; 6665 6666 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6667 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6668 bool MustBeMemberOperator = OperatorUses[Op][2]; 6669 6670 // C++ [over.oper]p8: 6671 // [...] Operator functions cannot have more or fewer parameters 6672 // than the number required for the corresponding operator, as 6673 // described in the rest of this subclause. 6674 unsigned NumParams = FnDecl->getNumParams() 6675 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6676 if (Op != OO_Call && 6677 ((NumParams == 1 && !CanBeUnaryOperator) || 6678 (NumParams == 2 && !CanBeBinaryOperator) || 6679 (NumParams < 1) || (NumParams > 2))) { 6680 // We have the wrong number of parameters. 6681 unsigned ErrorKind; 6682 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6683 ErrorKind = 2; // 2 -> unary or binary. 6684 } else if (CanBeUnaryOperator) { 6685 ErrorKind = 0; // 0 -> unary 6686 } else { 6687 assert(CanBeBinaryOperator && 6688 "All non-call overloaded operators are unary or binary!"); 6689 ErrorKind = 1; // 1 -> binary 6690 } 6691 6692 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6693 << FnDecl->getDeclName() << NumParams << ErrorKind; 6694 } 6695 6696 // Overloaded operators other than operator() cannot be variadic. 6697 if (Op != OO_Call && 6698 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6699 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6700 << FnDecl->getDeclName(); 6701 } 6702 6703 // Some operators must be non-static member functions. 6704 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6705 return Diag(FnDecl->getLocation(), 6706 diag::err_operator_overload_must_be_member) 6707 << FnDecl->getDeclName(); 6708 } 6709 6710 // C++ [over.inc]p1: 6711 // The user-defined function called operator++ implements the 6712 // prefix and postfix ++ operator. If this function is a member 6713 // function with no parameters, or a non-member function with one 6714 // parameter of class or enumeration type, it defines the prefix 6715 // increment operator ++ for objects of that type. If the function 6716 // is a member function with one parameter (which shall be of type 6717 // int) or a non-member function with two parameters (the second 6718 // of which shall be of type int), it defines the postfix 6719 // increment operator ++ for objects of that type. 6720 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6721 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6722 bool ParamIsInt = false; 6723 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6724 ParamIsInt = BT->getKind() == BuiltinType::Int; 6725 6726 if (!ParamIsInt) 6727 return Diag(LastParam->getLocation(), 6728 diag::err_operator_overload_post_incdec_must_be_int) 6729 << LastParam->getType() << (Op == OO_MinusMinus); 6730 } 6731 6732 return false; 6733} 6734 6735/// CheckLiteralOperatorDeclaration - Check whether the declaration 6736/// of this literal operator function is well-formed. If so, returns 6737/// false; otherwise, emits appropriate diagnostics and returns true. 6738bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6739 DeclContext *DC = FnDecl->getDeclContext(); 6740 Decl::Kind Kind = DC->getDeclKind(); 6741 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6742 Kind != Decl::LinkageSpec) { 6743 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6744 << FnDecl->getDeclName(); 6745 return true; 6746 } 6747 6748 bool Valid = false; 6749 6750 // template <char...> type operator "" name() is the only valid template 6751 // signature, and the only valid signature with no parameters. 6752 if (FnDecl->param_size() == 0) { 6753 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6754 // Must have only one template parameter 6755 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6756 if (Params->size() == 1) { 6757 NonTypeTemplateParmDecl *PmDecl = 6758 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6759 6760 // The template parameter must be a char parameter pack. 6761 if (PmDecl && PmDecl->isTemplateParameterPack() && 6762 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6763 Valid = true; 6764 } 6765 } 6766 } else { 6767 // Check the first parameter 6768 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6769 6770 QualType T = (*Param)->getType(); 6771 6772 // unsigned long long int, long double, and any character type are allowed 6773 // as the only parameters. 6774 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6775 Context.hasSameType(T, Context.LongDoubleTy) || 6776 Context.hasSameType(T, Context.CharTy) || 6777 Context.hasSameType(T, Context.WCharTy) || 6778 Context.hasSameType(T, Context.Char16Ty) || 6779 Context.hasSameType(T, Context.Char32Ty)) { 6780 if (++Param == FnDecl->param_end()) 6781 Valid = true; 6782 goto FinishedParams; 6783 } 6784 6785 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6786 const PointerType *PT = T->getAs<PointerType>(); 6787 if (!PT) 6788 goto FinishedParams; 6789 T = PT->getPointeeType(); 6790 if (!T.isConstQualified()) 6791 goto FinishedParams; 6792 T = T.getUnqualifiedType(); 6793 6794 // Move on to the second parameter; 6795 ++Param; 6796 6797 // If there is no second parameter, the first must be a const char * 6798 if (Param == FnDecl->param_end()) { 6799 if (Context.hasSameType(T, Context.CharTy)) 6800 Valid = true; 6801 goto FinishedParams; 6802 } 6803 6804 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6805 // are allowed as the first parameter to a two-parameter function 6806 if (!(Context.hasSameType(T, Context.CharTy) || 6807 Context.hasSameType(T, Context.WCharTy) || 6808 Context.hasSameType(T, Context.Char16Ty) || 6809 Context.hasSameType(T, Context.Char32Ty))) 6810 goto FinishedParams; 6811 6812 // The second and final parameter must be an std::size_t 6813 T = (*Param)->getType().getUnqualifiedType(); 6814 if (Context.hasSameType(T, Context.getSizeType()) && 6815 ++Param == FnDecl->param_end()) 6816 Valid = true; 6817 } 6818 6819 // FIXME: This diagnostic is absolutely terrible. 6820FinishedParams: 6821 if (!Valid) { 6822 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6823 << FnDecl->getDeclName(); 6824 return true; 6825 } 6826 6827 return false; 6828} 6829 6830/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6831/// linkage specification, including the language and (if present) 6832/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6833/// the location of the language string literal, which is provided 6834/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6835/// the '{' brace. Otherwise, this linkage specification does not 6836/// have any braces. 6837Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6838 SourceLocation LangLoc, 6839 llvm::StringRef Lang, 6840 SourceLocation LBraceLoc) { 6841 LinkageSpecDecl::LanguageIDs Language; 6842 if (Lang == "\"C\"") 6843 Language = LinkageSpecDecl::lang_c; 6844 else if (Lang == "\"C++\"") 6845 Language = LinkageSpecDecl::lang_cxx; 6846 else { 6847 Diag(LangLoc, diag::err_bad_language); 6848 return 0; 6849 } 6850 6851 // FIXME: Add all the various semantics of linkage specifications 6852 6853 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6854 ExternLoc, LangLoc, Language); 6855 CurContext->addDecl(D); 6856 PushDeclContext(S, D); 6857 return D; 6858} 6859 6860/// ActOnFinishLinkageSpecification - Complete the definition of 6861/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6862/// valid, it's the position of the closing '}' brace in a linkage 6863/// specification that uses braces. 6864Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6865 Decl *LinkageSpec, 6866 SourceLocation RBraceLoc) { 6867 if (LinkageSpec) { 6868 if (RBraceLoc.isValid()) { 6869 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6870 LSDecl->setRBraceLoc(RBraceLoc); 6871 } 6872 PopDeclContext(); 6873 } 6874 return LinkageSpec; 6875} 6876 6877/// \brief Perform semantic analysis for the variable declaration that 6878/// occurs within a C++ catch clause, returning the newly-created 6879/// variable. 6880VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6881 TypeSourceInfo *TInfo, 6882 SourceLocation StartLoc, 6883 SourceLocation Loc, 6884 IdentifierInfo *Name) { 6885 bool Invalid = false; 6886 QualType ExDeclType = TInfo->getType(); 6887 6888 // Arrays and functions decay. 6889 if (ExDeclType->isArrayType()) 6890 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6891 else if (ExDeclType->isFunctionType()) 6892 ExDeclType = Context.getPointerType(ExDeclType); 6893 6894 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6895 // The exception-declaration shall not denote a pointer or reference to an 6896 // incomplete type, other than [cv] void*. 6897 // N2844 forbids rvalue references. 6898 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6899 Diag(Loc, diag::err_catch_rvalue_ref); 6900 Invalid = true; 6901 } 6902 6903 // GCC allows catching pointers and references to incomplete types 6904 // as an extension; so do we, but we warn by default. 6905 6906 QualType BaseType = ExDeclType; 6907 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6908 unsigned DK = diag::err_catch_incomplete; 6909 bool IncompleteCatchIsInvalid = true; 6910 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6911 BaseType = Ptr->getPointeeType(); 6912 Mode = 1; 6913 DK = diag::ext_catch_incomplete_ptr; 6914 IncompleteCatchIsInvalid = false; 6915 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6916 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6917 BaseType = Ref->getPointeeType(); 6918 Mode = 2; 6919 DK = diag::ext_catch_incomplete_ref; 6920 IncompleteCatchIsInvalid = false; 6921 } 6922 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6923 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6924 IncompleteCatchIsInvalid) 6925 Invalid = true; 6926 6927 if (!Invalid && !ExDeclType->isDependentType() && 6928 RequireNonAbstractType(Loc, ExDeclType, 6929 diag::err_abstract_type_in_decl, 6930 AbstractVariableType)) 6931 Invalid = true; 6932 6933 // Only the non-fragile NeXT runtime currently supports C++ catches 6934 // of ObjC types, and no runtime supports catching ObjC types by value. 6935 if (!Invalid && getLangOptions().ObjC1) { 6936 QualType T = ExDeclType; 6937 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6938 T = RT->getPointeeType(); 6939 6940 if (T->isObjCObjectType()) { 6941 Diag(Loc, diag::err_objc_object_catch); 6942 Invalid = true; 6943 } else if (T->isObjCObjectPointerType()) { 6944 if (!getLangOptions().ObjCNonFragileABI) { 6945 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6946 Invalid = true; 6947 } 6948 } 6949 } 6950 6951 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 6952 ExDeclType, TInfo, SC_None, SC_None); 6953 ExDecl->setExceptionVariable(true); 6954 6955 if (!Invalid) { 6956 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 6957 // C++ [except.handle]p16: 6958 // The object declared in an exception-declaration or, if the 6959 // exception-declaration does not specify a name, a temporary (12.2) is 6960 // copy-initialized (8.5) from the exception object. [...] 6961 // The object is destroyed when the handler exits, after the destruction 6962 // of any automatic objects initialized within the handler. 6963 // 6964 // We just pretend to initialize the object with itself, then make sure 6965 // it can be destroyed later. 6966 QualType initType = ExDeclType; 6967 6968 InitializedEntity entity = 6969 InitializedEntity::InitializeVariable(ExDecl); 6970 InitializationKind initKind = 6971 InitializationKind::CreateCopy(Loc, SourceLocation()); 6972 6973 Expr *opaqueValue = 6974 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 6975 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 6976 ExprResult result = sequence.Perform(*this, entity, initKind, 6977 MultiExprArg(&opaqueValue, 1)); 6978 if (result.isInvalid()) 6979 Invalid = true; 6980 else { 6981 // If the constructor used was non-trivial, set this as the 6982 // "initializer". 6983 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 6984 if (!construct->getConstructor()->isTrivial()) { 6985 Expr *init = MaybeCreateExprWithCleanups(construct); 6986 ExDecl->setInit(init); 6987 } 6988 6989 // And make sure it's destructable. 6990 FinalizeVarWithDestructor(ExDecl, recordType); 6991 } 6992 } 6993 } 6994 6995 if (Invalid) 6996 ExDecl->setInvalidDecl(); 6997 6998 return ExDecl; 6999} 7000 7001/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7002/// handler. 7003Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7004 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7005 bool Invalid = D.isInvalidType(); 7006 7007 // Check for unexpanded parameter packs. 7008 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7009 UPPC_ExceptionType)) { 7010 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7011 D.getIdentifierLoc()); 7012 Invalid = true; 7013 } 7014 7015 IdentifierInfo *II = D.getIdentifier(); 7016 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7017 LookupOrdinaryName, 7018 ForRedeclaration)) { 7019 // The scope should be freshly made just for us. There is just no way 7020 // it contains any previous declaration. 7021 assert(!S->isDeclScope(PrevDecl)); 7022 if (PrevDecl->isTemplateParameter()) { 7023 // Maybe we will complain about the shadowed template parameter. 7024 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7025 } 7026 } 7027 7028 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7029 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7030 << D.getCXXScopeSpec().getRange(); 7031 Invalid = true; 7032 } 7033 7034 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7035 D.getSourceRange().getBegin(), 7036 D.getIdentifierLoc(), 7037 D.getIdentifier()); 7038 if (Invalid) 7039 ExDecl->setInvalidDecl(); 7040 7041 // Add the exception declaration into this scope. 7042 if (II) 7043 PushOnScopeChains(ExDecl, S); 7044 else 7045 CurContext->addDecl(ExDecl); 7046 7047 ProcessDeclAttributes(S, ExDecl, D); 7048 return ExDecl; 7049} 7050 7051Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7052 Expr *AssertExpr, 7053 Expr *AssertMessageExpr_, 7054 SourceLocation RParenLoc) { 7055 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7056 7057 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7058 llvm::APSInt Value(32); 7059 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7060 Diag(StaticAssertLoc, 7061 diag::err_static_assert_expression_is_not_constant) << 7062 AssertExpr->getSourceRange(); 7063 return 0; 7064 } 7065 7066 if (Value == 0) { 7067 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7068 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7069 } 7070 } 7071 7072 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7073 return 0; 7074 7075 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7076 AssertExpr, AssertMessage, RParenLoc); 7077 7078 CurContext->addDecl(Decl); 7079 return Decl; 7080} 7081 7082/// \brief Perform semantic analysis of the given friend type declaration. 7083/// 7084/// \returns A friend declaration that. 7085FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7086 TypeSourceInfo *TSInfo) { 7087 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7088 7089 QualType T = TSInfo->getType(); 7090 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7091 7092 if (!getLangOptions().CPlusPlus0x) { 7093 // C++03 [class.friend]p2: 7094 // An elaborated-type-specifier shall be used in a friend declaration 7095 // for a class.* 7096 // 7097 // * The class-key of the elaborated-type-specifier is required. 7098 if (!ActiveTemplateInstantiations.empty()) { 7099 // Do not complain about the form of friend template types during 7100 // template instantiation; we will already have complained when the 7101 // template was declared. 7102 } else if (!T->isElaboratedTypeSpecifier()) { 7103 // If we evaluated the type to a record type, suggest putting 7104 // a tag in front. 7105 if (const RecordType *RT = T->getAs<RecordType>()) { 7106 RecordDecl *RD = RT->getDecl(); 7107 7108 std::string InsertionText = std::string(" ") + RD->getKindName(); 7109 7110 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7111 << (unsigned) RD->getTagKind() 7112 << T 7113 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7114 InsertionText); 7115 } else { 7116 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7117 << T 7118 << SourceRange(FriendLoc, TypeRange.getEnd()); 7119 } 7120 } else if (T->getAs<EnumType>()) { 7121 Diag(FriendLoc, diag::ext_enum_friend) 7122 << T 7123 << SourceRange(FriendLoc, TypeRange.getEnd()); 7124 } 7125 } 7126 7127 // C++0x [class.friend]p3: 7128 // If the type specifier in a friend declaration designates a (possibly 7129 // cv-qualified) class type, that class is declared as a friend; otherwise, 7130 // the friend declaration is ignored. 7131 7132 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7133 // in [class.friend]p3 that we do not implement. 7134 7135 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7136} 7137 7138/// Handle a friend tag declaration where the scope specifier was 7139/// templated. 7140Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7141 unsigned TagSpec, SourceLocation TagLoc, 7142 CXXScopeSpec &SS, 7143 IdentifierInfo *Name, SourceLocation NameLoc, 7144 AttributeList *Attr, 7145 MultiTemplateParamsArg TempParamLists) { 7146 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7147 7148 bool isExplicitSpecialization = false; 7149 bool Invalid = false; 7150 7151 if (TemplateParameterList *TemplateParams 7152 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7153 TempParamLists.get(), 7154 TempParamLists.size(), 7155 /*friend*/ true, 7156 isExplicitSpecialization, 7157 Invalid)) { 7158 if (TemplateParams->size() > 0) { 7159 // This is a declaration of a class template. 7160 if (Invalid) 7161 return 0; 7162 7163 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7164 SS, Name, NameLoc, Attr, 7165 TemplateParams, AS_public, 7166 TempParamLists.size() - 1, 7167 (TemplateParameterList**) TempParamLists.release()).take(); 7168 } else { 7169 // The "template<>" header is extraneous. 7170 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7171 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7172 isExplicitSpecialization = true; 7173 } 7174 } 7175 7176 if (Invalid) return 0; 7177 7178 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7179 7180 bool isAllExplicitSpecializations = true; 7181 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7182 if (TempParamLists.get()[I]->size()) { 7183 isAllExplicitSpecializations = false; 7184 break; 7185 } 7186 } 7187 7188 // FIXME: don't ignore attributes. 7189 7190 // If it's explicit specializations all the way down, just forget 7191 // about the template header and build an appropriate non-templated 7192 // friend. TODO: for source fidelity, remember the headers. 7193 if (isAllExplicitSpecializations) { 7194 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7195 ElaboratedTypeKeyword Keyword 7196 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7197 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7198 *Name, NameLoc); 7199 if (T.isNull()) 7200 return 0; 7201 7202 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7203 if (isa<DependentNameType>(T)) { 7204 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7205 TL.setKeywordLoc(TagLoc); 7206 TL.setQualifierLoc(QualifierLoc); 7207 TL.setNameLoc(NameLoc); 7208 } else { 7209 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7210 TL.setKeywordLoc(TagLoc); 7211 TL.setQualifierLoc(QualifierLoc); 7212 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7213 } 7214 7215 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7216 TSI, FriendLoc); 7217 Friend->setAccess(AS_public); 7218 CurContext->addDecl(Friend); 7219 return Friend; 7220 } 7221 7222 // Handle the case of a templated-scope friend class. e.g. 7223 // template <class T> class A<T>::B; 7224 // FIXME: we don't support these right now. 7225 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7226 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7227 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7228 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7229 TL.setKeywordLoc(TagLoc); 7230 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7231 TL.setNameLoc(NameLoc); 7232 7233 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7234 TSI, FriendLoc); 7235 Friend->setAccess(AS_public); 7236 Friend->setUnsupportedFriend(true); 7237 CurContext->addDecl(Friend); 7238 return Friend; 7239} 7240 7241 7242/// Handle a friend type declaration. This works in tandem with 7243/// ActOnTag. 7244/// 7245/// Notes on friend class templates: 7246/// 7247/// We generally treat friend class declarations as if they were 7248/// declaring a class. So, for example, the elaborated type specifier 7249/// in a friend declaration is required to obey the restrictions of a 7250/// class-head (i.e. no typedefs in the scope chain), template 7251/// parameters are required to match up with simple template-ids, &c. 7252/// However, unlike when declaring a template specialization, it's 7253/// okay to refer to a template specialization without an empty 7254/// template parameter declaration, e.g. 7255/// friend class A<T>::B<unsigned>; 7256/// We permit this as a special case; if there are any template 7257/// parameters present at all, require proper matching, i.e. 7258/// template <> template <class T> friend class A<int>::B; 7259Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7260 MultiTemplateParamsArg TempParams) { 7261 SourceLocation Loc = DS.getSourceRange().getBegin(); 7262 7263 assert(DS.isFriendSpecified()); 7264 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7265 7266 // Try to convert the decl specifier to a type. This works for 7267 // friend templates because ActOnTag never produces a ClassTemplateDecl 7268 // for a TUK_Friend. 7269 Declarator TheDeclarator(DS, Declarator::MemberContext); 7270 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7271 QualType T = TSI->getType(); 7272 if (TheDeclarator.isInvalidType()) 7273 return 0; 7274 7275 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7276 return 0; 7277 7278 // This is definitely an error in C++98. It's probably meant to 7279 // be forbidden in C++0x, too, but the specification is just 7280 // poorly written. 7281 // 7282 // The problem is with declarations like the following: 7283 // template <T> friend A<T>::foo; 7284 // where deciding whether a class C is a friend or not now hinges 7285 // on whether there exists an instantiation of A that causes 7286 // 'foo' to equal C. There are restrictions on class-heads 7287 // (which we declare (by fiat) elaborated friend declarations to 7288 // be) that makes this tractable. 7289 // 7290 // FIXME: handle "template <> friend class A<T>;", which 7291 // is possibly well-formed? Who even knows? 7292 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7293 Diag(Loc, diag::err_tagless_friend_type_template) 7294 << DS.getSourceRange(); 7295 return 0; 7296 } 7297 7298 // C++98 [class.friend]p1: A friend of a class is a function 7299 // or class that is not a member of the class . . . 7300 // This is fixed in DR77, which just barely didn't make the C++03 7301 // deadline. It's also a very silly restriction that seriously 7302 // affects inner classes and which nobody else seems to implement; 7303 // thus we never diagnose it, not even in -pedantic. 7304 // 7305 // But note that we could warn about it: it's always useless to 7306 // friend one of your own members (it's not, however, worthless to 7307 // friend a member of an arbitrary specialization of your template). 7308 7309 Decl *D; 7310 if (unsigned NumTempParamLists = TempParams.size()) 7311 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7312 NumTempParamLists, 7313 TempParams.release(), 7314 TSI, 7315 DS.getFriendSpecLoc()); 7316 else 7317 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7318 7319 if (!D) 7320 return 0; 7321 7322 D->setAccess(AS_public); 7323 CurContext->addDecl(D); 7324 7325 return D; 7326} 7327 7328Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7329 MultiTemplateParamsArg TemplateParams) { 7330 const DeclSpec &DS = D.getDeclSpec(); 7331 7332 assert(DS.isFriendSpecified()); 7333 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7334 7335 SourceLocation Loc = D.getIdentifierLoc(); 7336 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7337 QualType T = TInfo->getType(); 7338 7339 // C++ [class.friend]p1 7340 // A friend of a class is a function or class.... 7341 // Note that this sees through typedefs, which is intended. 7342 // It *doesn't* see through dependent types, which is correct 7343 // according to [temp.arg.type]p3: 7344 // If a declaration acquires a function type through a 7345 // type dependent on a template-parameter and this causes 7346 // a declaration that does not use the syntactic form of a 7347 // function declarator to have a function type, the program 7348 // is ill-formed. 7349 if (!T->isFunctionType()) { 7350 Diag(Loc, diag::err_unexpected_friend); 7351 7352 // It might be worthwhile to try to recover by creating an 7353 // appropriate declaration. 7354 return 0; 7355 } 7356 7357 // C++ [namespace.memdef]p3 7358 // - If a friend declaration in a non-local class first declares a 7359 // class or function, the friend class or function is a member 7360 // of the innermost enclosing namespace. 7361 // - The name of the friend is not found by simple name lookup 7362 // until a matching declaration is provided in that namespace 7363 // scope (either before or after the class declaration granting 7364 // friendship). 7365 // - If a friend function is called, its name may be found by the 7366 // name lookup that considers functions from namespaces and 7367 // classes associated with the types of the function arguments. 7368 // - When looking for a prior declaration of a class or a function 7369 // declared as a friend, scopes outside the innermost enclosing 7370 // namespace scope are not considered. 7371 7372 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7373 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7374 DeclarationName Name = NameInfo.getName(); 7375 assert(Name); 7376 7377 // Check for unexpanded parameter packs. 7378 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7379 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7380 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7381 return 0; 7382 7383 // The context we found the declaration in, or in which we should 7384 // create the declaration. 7385 DeclContext *DC; 7386 Scope *DCScope = S; 7387 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7388 ForRedeclaration); 7389 7390 // FIXME: there are different rules in local classes 7391 7392 // There are four cases here. 7393 // - There's no scope specifier, in which case we just go to the 7394 // appropriate scope and look for a function or function template 7395 // there as appropriate. 7396 // Recover from invalid scope qualifiers as if they just weren't there. 7397 if (SS.isInvalid() || !SS.isSet()) { 7398 // C++0x [namespace.memdef]p3: 7399 // If the name in a friend declaration is neither qualified nor 7400 // a template-id and the declaration is a function or an 7401 // elaborated-type-specifier, the lookup to determine whether 7402 // the entity has been previously declared shall not consider 7403 // any scopes outside the innermost enclosing namespace. 7404 // C++0x [class.friend]p11: 7405 // If a friend declaration appears in a local class and the name 7406 // specified is an unqualified name, a prior declaration is 7407 // looked up without considering scopes that are outside the 7408 // innermost enclosing non-class scope. For a friend function 7409 // declaration, if there is no prior declaration, the program is 7410 // ill-formed. 7411 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7412 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7413 7414 // Find the appropriate context according to the above. 7415 DC = CurContext; 7416 while (true) { 7417 // Skip class contexts. If someone can cite chapter and verse 7418 // for this behavior, that would be nice --- it's what GCC and 7419 // EDG do, and it seems like a reasonable intent, but the spec 7420 // really only says that checks for unqualified existing 7421 // declarations should stop at the nearest enclosing namespace, 7422 // not that they should only consider the nearest enclosing 7423 // namespace. 7424 while (DC->isRecord()) 7425 DC = DC->getParent(); 7426 7427 LookupQualifiedName(Previous, DC); 7428 7429 // TODO: decide what we think about using declarations. 7430 if (isLocal || !Previous.empty()) 7431 break; 7432 7433 if (isTemplateId) { 7434 if (isa<TranslationUnitDecl>(DC)) break; 7435 } else { 7436 if (DC->isFileContext()) break; 7437 } 7438 DC = DC->getParent(); 7439 } 7440 7441 // C++ [class.friend]p1: A friend of a class is a function or 7442 // class that is not a member of the class . . . 7443 // C++0x changes this for both friend types and functions. 7444 // Most C++ 98 compilers do seem to give an error here, so 7445 // we do, too. 7446 if (!Previous.empty() && DC->Equals(CurContext) 7447 && !getLangOptions().CPlusPlus0x) 7448 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7449 7450 DCScope = getScopeForDeclContext(S, DC); 7451 7452 // - There's a non-dependent scope specifier, in which case we 7453 // compute it and do a previous lookup there for a function 7454 // or function template. 7455 } else if (!SS.getScopeRep()->isDependent()) { 7456 DC = computeDeclContext(SS); 7457 if (!DC) return 0; 7458 7459 if (RequireCompleteDeclContext(SS, DC)) return 0; 7460 7461 LookupQualifiedName(Previous, DC); 7462 7463 // Ignore things found implicitly in the wrong scope. 7464 // TODO: better diagnostics for this case. Suggesting the right 7465 // qualified scope would be nice... 7466 LookupResult::Filter F = Previous.makeFilter(); 7467 while (F.hasNext()) { 7468 NamedDecl *D = F.next(); 7469 if (!DC->InEnclosingNamespaceSetOf( 7470 D->getDeclContext()->getRedeclContext())) 7471 F.erase(); 7472 } 7473 F.done(); 7474 7475 if (Previous.empty()) { 7476 D.setInvalidType(); 7477 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7478 return 0; 7479 } 7480 7481 // C++ [class.friend]p1: A friend of a class is a function or 7482 // class that is not a member of the class . . . 7483 if (DC->Equals(CurContext)) 7484 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7485 7486 // - There's a scope specifier that does not match any template 7487 // parameter lists, in which case we use some arbitrary context, 7488 // create a method or method template, and wait for instantiation. 7489 // - There's a scope specifier that does match some template 7490 // parameter lists, which we don't handle right now. 7491 } else { 7492 DC = CurContext; 7493 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7494 } 7495 7496 if (!DC->isRecord()) { 7497 // This implies that it has to be an operator or function. 7498 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7499 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7500 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7501 Diag(Loc, diag::err_introducing_special_friend) << 7502 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7503 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7504 return 0; 7505 } 7506 } 7507 7508 bool Redeclaration = false; 7509 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7510 move(TemplateParams), 7511 IsDefinition, 7512 Redeclaration); 7513 if (!ND) return 0; 7514 7515 assert(ND->getDeclContext() == DC); 7516 assert(ND->getLexicalDeclContext() == CurContext); 7517 7518 // Add the function declaration to the appropriate lookup tables, 7519 // adjusting the redeclarations list as necessary. We don't 7520 // want to do this yet if the friending class is dependent. 7521 // 7522 // Also update the scope-based lookup if the target context's 7523 // lookup context is in lexical scope. 7524 if (!CurContext->isDependentContext()) { 7525 DC = DC->getRedeclContext(); 7526 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7527 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7528 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7529 } 7530 7531 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7532 D.getIdentifierLoc(), ND, 7533 DS.getFriendSpecLoc()); 7534 FrD->setAccess(AS_public); 7535 CurContext->addDecl(FrD); 7536 7537 if (ND->isInvalidDecl()) 7538 FrD->setInvalidDecl(); 7539 else { 7540 FunctionDecl *FD; 7541 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7542 FD = FTD->getTemplatedDecl(); 7543 else 7544 FD = cast<FunctionDecl>(ND); 7545 7546 // Mark templated-scope function declarations as unsupported. 7547 if (FD->getNumTemplateParameterLists()) 7548 FrD->setUnsupportedFriend(true); 7549 } 7550 7551 return ND; 7552} 7553 7554void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7555 AdjustDeclIfTemplate(Dcl); 7556 7557 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7558 if (!Fn) { 7559 Diag(DelLoc, diag::err_deleted_non_function); 7560 return; 7561 } 7562 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7563 Diag(DelLoc, diag::err_deleted_decl_not_first); 7564 Diag(Prev->getLocation(), diag::note_previous_declaration); 7565 // If the declaration wasn't the first, we delete the function anyway for 7566 // recovery. 7567 } 7568 Fn->setDeleted(); 7569} 7570 7571static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7572 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7573 Stmt *SubStmt = *CI; 7574 if (!SubStmt) 7575 continue; 7576 if (isa<ReturnStmt>(SubStmt)) 7577 Self.Diag(SubStmt->getSourceRange().getBegin(), 7578 diag::err_return_in_constructor_handler); 7579 if (!isa<Expr>(SubStmt)) 7580 SearchForReturnInStmt(Self, SubStmt); 7581 } 7582} 7583 7584void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7585 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7586 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7587 SearchForReturnInStmt(*this, Handler); 7588 } 7589} 7590 7591bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7592 const CXXMethodDecl *Old) { 7593 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7594 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7595 7596 if (Context.hasSameType(NewTy, OldTy) || 7597 NewTy->isDependentType() || OldTy->isDependentType()) 7598 return false; 7599 7600 // Check if the return types are covariant 7601 QualType NewClassTy, OldClassTy; 7602 7603 /// Both types must be pointers or references to classes. 7604 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7605 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7606 NewClassTy = NewPT->getPointeeType(); 7607 OldClassTy = OldPT->getPointeeType(); 7608 } 7609 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7610 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7611 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7612 NewClassTy = NewRT->getPointeeType(); 7613 OldClassTy = OldRT->getPointeeType(); 7614 } 7615 } 7616 } 7617 7618 // The return types aren't either both pointers or references to a class type. 7619 if (NewClassTy.isNull()) { 7620 Diag(New->getLocation(), 7621 diag::err_different_return_type_for_overriding_virtual_function) 7622 << New->getDeclName() << NewTy << OldTy; 7623 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7624 7625 return true; 7626 } 7627 7628 // C++ [class.virtual]p6: 7629 // If the return type of D::f differs from the return type of B::f, the 7630 // class type in the return type of D::f shall be complete at the point of 7631 // declaration of D::f or shall be the class type D. 7632 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7633 if (!RT->isBeingDefined() && 7634 RequireCompleteType(New->getLocation(), NewClassTy, 7635 PDiag(diag::err_covariant_return_incomplete) 7636 << New->getDeclName())) 7637 return true; 7638 } 7639 7640 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7641 // Check if the new class derives from the old class. 7642 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7643 Diag(New->getLocation(), 7644 diag::err_covariant_return_not_derived) 7645 << New->getDeclName() << NewTy << OldTy; 7646 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7647 return true; 7648 } 7649 7650 // Check if we the conversion from derived to base is valid. 7651 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7652 diag::err_covariant_return_inaccessible_base, 7653 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7654 // FIXME: Should this point to the return type? 7655 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7656 // FIXME: this note won't trigger for delayed access control 7657 // diagnostics, and it's impossible to get an undelayed error 7658 // here from access control during the original parse because 7659 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7660 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7661 return true; 7662 } 7663 } 7664 7665 // The qualifiers of the return types must be the same. 7666 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7667 Diag(New->getLocation(), 7668 diag::err_covariant_return_type_different_qualifications) 7669 << New->getDeclName() << NewTy << OldTy; 7670 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7671 return true; 7672 }; 7673 7674 7675 // The new class type must have the same or less qualifiers as the old type. 7676 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7677 Diag(New->getLocation(), 7678 diag::err_covariant_return_type_class_type_more_qualified) 7679 << New->getDeclName() << NewTy << OldTy; 7680 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7681 return true; 7682 }; 7683 7684 return false; 7685} 7686 7687/// \brief Mark the given method pure. 7688/// 7689/// \param Method the method to be marked pure. 7690/// 7691/// \param InitRange the source range that covers the "0" initializer. 7692bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7693 SourceLocation EndLoc = InitRange.getEnd(); 7694 if (EndLoc.isValid()) 7695 Method->setRangeEnd(EndLoc); 7696 7697 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7698 Method->setPure(); 7699 return false; 7700 } 7701 7702 if (!Method->isInvalidDecl()) 7703 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7704 << Method->getDeclName() << InitRange; 7705 return true; 7706} 7707 7708/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7709/// an initializer for the out-of-line declaration 'Dcl'. The scope 7710/// is a fresh scope pushed for just this purpose. 7711/// 7712/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7713/// static data member of class X, names should be looked up in the scope of 7714/// class X. 7715void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7716 // If there is no declaration, there was an error parsing it. 7717 if (D == 0 || D->isInvalidDecl()) return; 7718 7719 // We should only get called for declarations with scope specifiers, like: 7720 // int foo::bar; 7721 assert(D->isOutOfLine()); 7722 EnterDeclaratorContext(S, D->getDeclContext()); 7723} 7724 7725/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7726/// initializer for the out-of-line declaration 'D'. 7727void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7728 // If there is no declaration, there was an error parsing it. 7729 if (D == 0 || D->isInvalidDecl()) return; 7730 7731 assert(D->isOutOfLine()); 7732 ExitDeclaratorContext(S); 7733} 7734 7735/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7736/// C++ if/switch/while/for statement. 7737/// e.g: "if (int x = f()) {...}" 7738DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7739 // C++ 6.4p2: 7740 // The declarator shall not specify a function or an array. 7741 // The type-specifier-seq shall not contain typedef and shall not declare a 7742 // new class or enumeration. 7743 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7744 "Parser allowed 'typedef' as storage class of condition decl."); 7745 7746 TagDecl *OwnedTag = 0; 7747 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7748 QualType Ty = TInfo->getType(); 7749 7750 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7751 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7752 // would be created and CXXConditionDeclExpr wants a VarDecl. 7753 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7754 << D.getSourceRange(); 7755 return DeclResult(); 7756 } else if (OwnedTag && OwnedTag->isDefinition()) { 7757 // The type-specifier-seq shall not declare a new class or enumeration. 7758 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7759 } 7760 7761 Decl *Dcl = ActOnDeclarator(S, D); 7762 if (!Dcl) 7763 return DeclResult(); 7764 7765 return Dcl; 7766} 7767 7768void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7769 bool DefinitionRequired) { 7770 // Ignore any vtable uses in unevaluated operands or for classes that do 7771 // not have a vtable. 7772 if (!Class->isDynamicClass() || Class->isDependentContext() || 7773 CurContext->isDependentContext() || 7774 ExprEvalContexts.back().Context == Unevaluated) 7775 return; 7776 7777 // Try to insert this class into the map. 7778 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7779 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7780 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7781 if (!Pos.second) { 7782 // If we already had an entry, check to see if we are promoting this vtable 7783 // to required a definition. If so, we need to reappend to the VTableUses 7784 // list, since we may have already processed the first entry. 7785 if (DefinitionRequired && !Pos.first->second) { 7786 Pos.first->second = true; 7787 } else { 7788 // Otherwise, we can early exit. 7789 return; 7790 } 7791 } 7792 7793 // Local classes need to have their virtual members marked 7794 // immediately. For all other classes, we mark their virtual members 7795 // at the end of the translation unit. 7796 if (Class->isLocalClass()) 7797 MarkVirtualMembersReferenced(Loc, Class); 7798 else 7799 VTableUses.push_back(std::make_pair(Class, Loc)); 7800} 7801 7802bool Sema::DefineUsedVTables() { 7803 if (VTableUses.empty()) 7804 return false; 7805 7806 // Note: The VTableUses vector could grow as a result of marking 7807 // the members of a class as "used", so we check the size each 7808 // time through the loop and prefer indices (with are stable) to 7809 // iterators (which are not). 7810 bool DefinedAnything = false; 7811 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7812 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7813 if (!Class) 7814 continue; 7815 7816 SourceLocation Loc = VTableUses[I].second; 7817 7818 // If this class has a key function, but that key function is 7819 // defined in another translation unit, we don't need to emit the 7820 // vtable even though we're using it. 7821 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7822 if (KeyFunction && !KeyFunction->hasBody()) { 7823 switch (KeyFunction->getTemplateSpecializationKind()) { 7824 case TSK_Undeclared: 7825 case TSK_ExplicitSpecialization: 7826 case TSK_ExplicitInstantiationDeclaration: 7827 // The key function is in another translation unit. 7828 continue; 7829 7830 case TSK_ExplicitInstantiationDefinition: 7831 case TSK_ImplicitInstantiation: 7832 // We will be instantiating the key function. 7833 break; 7834 } 7835 } else if (!KeyFunction) { 7836 // If we have a class with no key function that is the subject 7837 // of an explicit instantiation declaration, suppress the 7838 // vtable; it will live with the explicit instantiation 7839 // definition. 7840 bool IsExplicitInstantiationDeclaration 7841 = Class->getTemplateSpecializationKind() 7842 == TSK_ExplicitInstantiationDeclaration; 7843 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7844 REnd = Class->redecls_end(); 7845 R != REnd; ++R) { 7846 TemplateSpecializationKind TSK 7847 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7848 if (TSK == TSK_ExplicitInstantiationDeclaration) 7849 IsExplicitInstantiationDeclaration = true; 7850 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7851 IsExplicitInstantiationDeclaration = false; 7852 break; 7853 } 7854 } 7855 7856 if (IsExplicitInstantiationDeclaration) 7857 continue; 7858 } 7859 7860 // Mark all of the virtual members of this class as referenced, so 7861 // that we can build a vtable. Then, tell the AST consumer that a 7862 // vtable for this class is required. 7863 DefinedAnything = true; 7864 MarkVirtualMembersReferenced(Loc, Class); 7865 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7866 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7867 7868 // Optionally warn if we're emitting a weak vtable. 7869 if (Class->getLinkage() == ExternalLinkage && 7870 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7871 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7872 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7873 } 7874 } 7875 VTableUses.clear(); 7876 7877 return DefinedAnything; 7878} 7879 7880void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7881 const CXXRecordDecl *RD) { 7882 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7883 e = RD->method_end(); i != e; ++i) { 7884 CXXMethodDecl *MD = *i; 7885 7886 // C++ [basic.def.odr]p2: 7887 // [...] A virtual member function is used if it is not pure. [...] 7888 if (MD->isVirtual() && !MD->isPure()) 7889 MarkDeclarationReferenced(Loc, MD); 7890 } 7891 7892 // Only classes that have virtual bases need a VTT. 7893 if (RD->getNumVBases() == 0) 7894 return; 7895 7896 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7897 e = RD->bases_end(); i != e; ++i) { 7898 const CXXRecordDecl *Base = 7899 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7900 if (Base->getNumVBases() == 0) 7901 continue; 7902 MarkVirtualMembersReferenced(Loc, Base); 7903 } 7904} 7905 7906/// SetIvarInitializers - This routine builds initialization ASTs for the 7907/// Objective-C implementation whose ivars need be initialized. 7908void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7909 if (!getLangOptions().CPlusPlus) 7910 return; 7911 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7912 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7913 CollectIvarsToConstructOrDestruct(OID, ivars); 7914 if (ivars.empty()) 7915 return; 7916 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 7917 for (unsigned i = 0; i < ivars.size(); i++) { 7918 FieldDecl *Field = ivars[i]; 7919 if (Field->isInvalidDecl()) 7920 continue; 7921 7922 CXXCtorInitializer *Member; 7923 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 7924 InitializationKind InitKind = 7925 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 7926 7927 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 7928 ExprResult MemberInit = 7929 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 7930 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 7931 // Note, MemberInit could actually come back empty if no initialization 7932 // is required (e.g., because it would call a trivial default constructor) 7933 if (!MemberInit.get() || MemberInit.isInvalid()) 7934 continue; 7935 7936 Member = 7937 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 7938 SourceLocation(), 7939 MemberInit.takeAs<Expr>(), 7940 SourceLocation()); 7941 AllToInit.push_back(Member); 7942 7943 // Be sure that the destructor is accessible and is marked as referenced. 7944 if (const RecordType *RecordTy 7945 = Context.getBaseElementType(Field->getType()) 7946 ->getAs<RecordType>()) { 7947 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 7948 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 7949 MarkDeclarationReferenced(Field->getLocation(), Destructor); 7950 CheckDestructorAccess(Field->getLocation(), Destructor, 7951 PDiag(diag::err_access_dtor_ivar) 7952 << Context.getBaseElementType(Field->getType())); 7953 } 7954 } 7955 } 7956 ObjCImplementation->setIvarInitializers(Context, 7957 AllToInit.data(), AllToInit.size()); 7958 } 7959} 7960