SemaDeclCXX.cpp revision 023df37c27ee8035664fb62f206ca58f4e2a169d
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, SourceLocation DefaultLoc) { 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 if (DefaultLoc.isValid()) 1032 Diag(DefaultLoc, diag::err_default_special_members); 1033 1034 if (SS.isSet() && !SS.isInvalid()) { 1035 // The user provided a superfluous scope specifier inside a class 1036 // definition: 1037 // 1038 // class X { 1039 // int X::member; 1040 // }; 1041 DeclContext *DC = 0; 1042 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1043 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1044 << Name << FixItHint::CreateRemoval(SS.getRange()); 1045 else 1046 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1047 << Name << SS.getRange(); 1048 1049 SS.clear(); 1050 } 1051 1052 // FIXME: Check for template parameters! 1053 // FIXME: Check that the name is an identifier! 1054 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1055 AS); 1056 assert(Member && "HandleField never returns null"); 1057 } else { 1058 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition, 1059 DefaultLoc); 1060 if (!Member) { 1061 return 0; 1062 } 1063 1064 // Non-instance-fields can't have a bitfield. 1065 if (BitWidth) { 1066 if (Member->isInvalidDecl()) { 1067 // don't emit another diagnostic. 1068 } else if (isa<VarDecl>(Member)) { 1069 // C++ 9.6p3: A bit-field shall not be a static member. 1070 // "static member 'A' cannot be a bit-field" 1071 Diag(Loc, diag::err_static_not_bitfield) 1072 << Name << BitWidth->getSourceRange(); 1073 } else if (isa<TypedefDecl>(Member)) { 1074 // "typedef member 'x' cannot be a bit-field" 1075 Diag(Loc, diag::err_typedef_not_bitfield) 1076 << Name << BitWidth->getSourceRange(); 1077 } else { 1078 // A function typedef ("typedef int f(); f a;"). 1079 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1080 Diag(Loc, diag::err_not_integral_type_bitfield) 1081 << Name << cast<ValueDecl>(Member)->getType() 1082 << BitWidth->getSourceRange(); 1083 } 1084 1085 BitWidth = 0; 1086 Member->setInvalidDecl(); 1087 } 1088 1089 Member->setAccess(AS); 1090 1091 // If we have declared a member function template, set the access of the 1092 // templated declaration as well. 1093 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1094 FunTmpl->getTemplatedDecl()->setAccess(AS); 1095 } 1096 1097 if (VS.isOverrideSpecified()) { 1098 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1099 if (!MD || !MD->isVirtual()) { 1100 Diag(Member->getLocStart(), 1101 diag::override_keyword_only_allowed_on_virtual_member_functions) 1102 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1103 } else 1104 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1105 } 1106 if (VS.isFinalSpecified()) { 1107 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1108 if (!MD || !MD->isVirtual()) { 1109 Diag(Member->getLocStart(), 1110 diag::override_keyword_only_allowed_on_virtual_member_functions) 1111 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1112 } else 1113 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1114 } 1115 1116 if (VS.getLastLocation().isValid()) { 1117 // Update the end location of a method that has a virt-specifiers. 1118 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1119 MD->setRangeEnd(VS.getLastLocation()); 1120 } 1121 1122 CheckOverrideControl(Member); 1123 1124 assert((Name || isInstField) && "No identifier for non-field ?"); 1125 1126 if (Init) 1127 AddInitializerToDecl(Member, Init, false, 1128 DS.getTypeSpecType() == DeclSpec::TST_auto); 1129 if (Deleted) // FIXME: Source location is not very good. 1130 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1131 1132 FinalizeDeclaration(Member); 1133 1134 if (isInstField) 1135 FieldCollector->Add(cast<FieldDecl>(Member)); 1136 return Member; 1137} 1138 1139/// \brief Find the direct and/or virtual base specifiers that 1140/// correspond to the given base type, for use in base initialization 1141/// within a constructor. 1142static bool FindBaseInitializer(Sema &SemaRef, 1143 CXXRecordDecl *ClassDecl, 1144 QualType BaseType, 1145 const CXXBaseSpecifier *&DirectBaseSpec, 1146 const CXXBaseSpecifier *&VirtualBaseSpec) { 1147 // First, check for a direct base class. 1148 DirectBaseSpec = 0; 1149 for (CXXRecordDecl::base_class_const_iterator Base 1150 = ClassDecl->bases_begin(); 1151 Base != ClassDecl->bases_end(); ++Base) { 1152 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1153 // We found a direct base of this type. That's what we're 1154 // initializing. 1155 DirectBaseSpec = &*Base; 1156 break; 1157 } 1158 } 1159 1160 // Check for a virtual base class. 1161 // FIXME: We might be able to short-circuit this if we know in advance that 1162 // there are no virtual bases. 1163 VirtualBaseSpec = 0; 1164 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1165 // We haven't found a base yet; search the class hierarchy for a 1166 // virtual base class. 1167 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1168 /*DetectVirtual=*/false); 1169 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1170 BaseType, Paths)) { 1171 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1172 Path != Paths.end(); ++Path) { 1173 if (Path->back().Base->isVirtual()) { 1174 VirtualBaseSpec = Path->back().Base; 1175 break; 1176 } 1177 } 1178 } 1179 } 1180 1181 return DirectBaseSpec || VirtualBaseSpec; 1182} 1183 1184/// ActOnMemInitializer - Handle a C++ member initializer. 1185MemInitResult 1186Sema::ActOnMemInitializer(Decl *ConstructorD, 1187 Scope *S, 1188 CXXScopeSpec &SS, 1189 IdentifierInfo *MemberOrBase, 1190 ParsedType TemplateTypeTy, 1191 SourceLocation IdLoc, 1192 SourceLocation LParenLoc, 1193 ExprTy **Args, unsigned NumArgs, 1194 SourceLocation RParenLoc, 1195 SourceLocation EllipsisLoc) { 1196 if (!ConstructorD) 1197 return true; 1198 1199 AdjustDeclIfTemplate(ConstructorD); 1200 1201 CXXConstructorDecl *Constructor 1202 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1203 if (!Constructor) { 1204 // The user wrote a constructor initializer on a function that is 1205 // not a C++ constructor. Ignore the error for now, because we may 1206 // have more member initializers coming; we'll diagnose it just 1207 // once in ActOnMemInitializers. 1208 return true; 1209 } 1210 1211 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1212 1213 // C++ [class.base.init]p2: 1214 // Names in a mem-initializer-id are looked up in the scope of the 1215 // constructor's class and, if not found in that scope, are looked 1216 // up in the scope containing the constructor's definition. 1217 // [Note: if the constructor's class contains a member with the 1218 // same name as a direct or virtual base class of the class, a 1219 // mem-initializer-id naming the member or base class and composed 1220 // of a single identifier refers to the class member. A 1221 // mem-initializer-id for the hidden base class may be specified 1222 // using a qualified name. ] 1223 if (!SS.getScopeRep() && !TemplateTypeTy) { 1224 // Look for a member, first. 1225 FieldDecl *Member = 0; 1226 DeclContext::lookup_result Result 1227 = ClassDecl->lookup(MemberOrBase); 1228 if (Result.first != Result.second) { 1229 Member = dyn_cast<FieldDecl>(*Result.first); 1230 1231 if (Member) { 1232 if (EllipsisLoc.isValid()) 1233 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1234 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1235 1236 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1237 LParenLoc, RParenLoc); 1238 } 1239 1240 // Handle anonymous union case. 1241 if (IndirectFieldDecl* IndirectField 1242 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1243 if (EllipsisLoc.isValid()) 1244 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1245 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1246 1247 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1248 NumArgs, IdLoc, 1249 LParenLoc, RParenLoc); 1250 } 1251 } 1252 } 1253 // It didn't name a member, so see if it names a class. 1254 QualType BaseType; 1255 TypeSourceInfo *TInfo = 0; 1256 1257 if (TemplateTypeTy) { 1258 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1259 } else { 1260 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1261 LookupParsedName(R, S, &SS); 1262 1263 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1264 if (!TyD) { 1265 if (R.isAmbiguous()) return true; 1266 1267 // We don't want access-control diagnostics here. 1268 R.suppressDiagnostics(); 1269 1270 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1271 bool NotUnknownSpecialization = false; 1272 DeclContext *DC = computeDeclContext(SS, false); 1273 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1274 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1275 1276 if (!NotUnknownSpecialization) { 1277 // When the scope specifier can refer to a member of an unknown 1278 // specialization, we take it as a type name. 1279 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1280 SS.getWithLocInContext(Context), 1281 *MemberOrBase, IdLoc); 1282 if (BaseType.isNull()) 1283 return true; 1284 1285 R.clear(); 1286 R.setLookupName(MemberOrBase); 1287 } 1288 } 1289 1290 // If no results were found, try to correct typos. 1291 if (R.empty() && BaseType.isNull() && 1292 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1293 R.isSingleResult()) { 1294 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1295 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1296 // We have found a non-static data member with a similar 1297 // name to what was typed; complain and initialize that 1298 // member. 1299 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1300 << MemberOrBase << true << R.getLookupName() 1301 << FixItHint::CreateReplacement(R.getNameLoc(), 1302 R.getLookupName().getAsString()); 1303 Diag(Member->getLocation(), diag::note_previous_decl) 1304 << Member->getDeclName(); 1305 1306 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1307 LParenLoc, RParenLoc); 1308 } 1309 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1310 const CXXBaseSpecifier *DirectBaseSpec; 1311 const CXXBaseSpecifier *VirtualBaseSpec; 1312 if (FindBaseInitializer(*this, ClassDecl, 1313 Context.getTypeDeclType(Type), 1314 DirectBaseSpec, VirtualBaseSpec)) { 1315 // We have found a direct or virtual base class with a 1316 // similar name to what was typed; complain and initialize 1317 // that base class. 1318 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1319 << MemberOrBase << false << R.getLookupName() 1320 << FixItHint::CreateReplacement(R.getNameLoc(), 1321 R.getLookupName().getAsString()); 1322 1323 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1324 : VirtualBaseSpec; 1325 Diag(BaseSpec->getSourceRange().getBegin(), 1326 diag::note_base_class_specified_here) 1327 << BaseSpec->getType() 1328 << BaseSpec->getSourceRange(); 1329 1330 TyD = Type; 1331 } 1332 } 1333 } 1334 1335 if (!TyD && BaseType.isNull()) { 1336 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1337 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1338 return true; 1339 } 1340 } 1341 1342 if (BaseType.isNull()) { 1343 BaseType = Context.getTypeDeclType(TyD); 1344 if (SS.isSet()) { 1345 NestedNameSpecifier *Qualifier = 1346 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1347 1348 // FIXME: preserve source range information 1349 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1350 } 1351 } 1352 } 1353 1354 if (!TInfo) 1355 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1356 1357 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1358 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1359} 1360 1361/// Checks an initializer expression for use of uninitialized fields, such as 1362/// containing the field that is being initialized. Returns true if there is an 1363/// uninitialized field was used an updates the SourceLocation parameter; false 1364/// otherwise. 1365static bool InitExprContainsUninitializedFields(const Stmt *S, 1366 const ValueDecl *LhsField, 1367 SourceLocation *L) { 1368 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1369 1370 if (isa<CallExpr>(S)) { 1371 // Do not descend into function calls or constructors, as the use 1372 // of an uninitialized field may be valid. One would have to inspect 1373 // the contents of the function/ctor to determine if it is safe or not. 1374 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1375 // may be safe, depending on what the function/ctor does. 1376 return false; 1377 } 1378 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1379 const NamedDecl *RhsField = ME->getMemberDecl(); 1380 1381 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1382 // The member expression points to a static data member. 1383 assert(VD->isStaticDataMember() && 1384 "Member points to non-static data member!"); 1385 (void)VD; 1386 return false; 1387 } 1388 1389 if (isa<EnumConstantDecl>(RhsField)) { 1390 // The member expression points to an enum. 1391 return false; 1392 } 1393 1394 if (RhsField == LhsField) { 1395 // Initializing a field with itself. Throw a warning. 1396 // But wait; there are exceptions! 1397 // Exception #1: The field may not belong to this record. 1398 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1399 const Expr *base = ME->getBase(); 1400 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1401 // Even though the field matches, it does not belong to this record. 1402 return false; 1403 } 1404 // None of the exceptions triggered; return true to indicate an 1405 // uninitialized field was used. 1406 *L = ME->getMemberLoc(); 1407 return true; 1408 } 1409 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1410 // sizeof/alignof doesn't reference contents, do not warn. 1411 return false; 1412 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1413 // address-of doesn't reference contents (the pointer may be dereferenced 1414 // in the same expression but it would be rare; and weird). 1415 if (UOE->getOpcode() == UO_AddrOf) 1416 return false; 1417 } 1418 for (Stmt::const_child_range it = S->children(); it; ++it) { 1419 if (!*it) { 1420 // An expression such as 'member(arg ?: "")' may trigger this. 1421 continue; 1422 } 1423 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1424 return true; 1425 } 1426 return false; 1427} 1428 1429MemInitResult 1430Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1431 unsigned NumArgs, SourceLocation IdLoc, 1432 SourceLocation LParenLoc, 1433 SourceLocation RParenLoc) { 1434 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1435 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1436 assert((DirectMember || IndirectMember) && 1437 "Member must be a FieldDecl or IndirectFieldDecl"); 1438 1439 if (Member->isInvalidDecl()) 1440 return true; 1441 1442 // Diagnose value-uses of fields to initialize themselves, e.g. 1443 // foo(foo) 1444 // where foo is not also a parameter to the constructor. 1445 // TODO: implement -Wuninitialized and fold this into that framework. 1446 for (unsigned i = 0; i < NumArgs; ++i) { 1447 SourceLocation L; 1448 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1449 // FIXME: Return true in the case when other fields are used before being 1450 // uninitialized. For example, let this field be the i'th field. When 1451 // initializing the i'th field, throw a warning if any of the >= i'th 1452 // fields are used, as they are not yet initialized. 1453 // Right now we are only handling the case where the i'th field uses 1454 // itself in its initializer. 1455 Diag(L, diag::warn_field_is_uninit); 1456 } 1457 } 1458 1459 bool HasDependentArg = false; 1460 for (unsigned i = 0; i < NumArgs; i++) 1461 HasDependentArg |= Args[i]->isTypeDependent(); 1462 1463 Expr *Init; 1464 if (Member->getType()->isDependentType() || HasDependentArg) { 1465 // Can't check initialization for a member of dependent type or when 1466 // any of the arguments are type-dependent expressions. 1467 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1468 RParenLoc); 1469 1470 // Erase any temporaries within this evaluation context; we're not 1471 // going to track them in the AST, since we'll be rebuilding the 1472 // ASTs during template instantiation. 1473 ExprTemporaries.erase( 1474 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1475 ExprTemporaries.end()); 1476 } else { 1477 // Initialize the member. 1478 InitializedEntity MemberEntity = 1479 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1480 : InitializedEntity::InitializeMember(IndirectMember, 0); 1481 InitializationKind Kind = 1482 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1483 1484 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1485 1486 ExprResult MemberInit = 1487 InitSeq.Perform(*this, MemberEntity, Kind, 1488 MultiExprArg(*this, Args, NumArgs), 0); 1489 if (MemberInit.isInvalid()) 1490 return true; 1491 1492 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1493 1494 // C++0x [class.base.init]p7: 1495 // The initialization of each base and member constitutes a 1496 // full-expression. 1497 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1498 if (MemberInit.isInvalid()) 1499 return true; 1500 1501 // If we are in a dependent context, template instantiation will 1502 // perform this type-checking again. Just save the arguments that we 1503 // received in a ParenListExpr. 1504 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1505 // of the information that we have about the member 1506 // initializer. However, deconstructing the ASTs is a dicey process, 1507 // and this approach is far more likely to get the corner cases right. 1508 if (CurContext->isDependentContext()) 1509 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1510 RParenLoc); 1511 else 1512 Init = MemberInit.get(); 1513 } 1514 1515 if (DirectMember) { 1516 return new (Context) CXXCtorInitializer(Context, DirectMember, 1517 IdLoc, LParenLoc, Init, 1518 RParenLoc); 1519 } else { 1520 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1521 IdLoc, LParenLoc, Init, 1522 RParenLoc); 1523 } 1524} 1525 1526MemInitResult 1527Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1528 Expr **Args, unsigned NumArgs, 1529 SourceLocation NameLoc, 1530 SourceLocation LParenLoc, 1531 SourceLocation RParenLoc, 1532 CXXRecordDecl *ClassDecl) { 1533 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1534 if (!LangOpts.CPlusPlus0x) 1535 return Diag(Loc, diag::err_delegation_0x_only) 1536 << TInfo->getTypeLoc().getLocalSourceRange(); 1537 1538 // Initialize the object. 1539 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1540 QualType(ClassDecl->getTypeForDecl(), 0)); 1541 InitializationKind Kind = 1542 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1543 1544 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1545 1546 ExprResult DelegationInit = 1547 InitSeq.Perform(*this, DelegationEntity, Kind, 1548 MultiExprArg(*this, Args, NumArgs), 0); 1549 if (DelegationInit.isInvalid()) 1550 return true; 1551 1552 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1553 CXXConstructorDecl *Constructor 1554 = ConExpr->getConstructor(); 1555 assert(Constructor && "Delegating constructor with no target?"); 1556 1557 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1558 1559 // C++0x [class.base.init]p7: 1560 // The initialization of each base and member constitutes a 1561 // full-expression. 1562 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1563 if (DelegationInit.isInvalid()) 1564 return true; 1565 1566 // If we are in a dependent context, template instantiation will 1567 // perform this type-checking again. Just save the arguments that we 1568 // received in a ParenListExpr. 1569 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1570 // of the information that we have about the base 1571 // initializer. However, deconstructing the ASTs is a dicey process, 1572 // and this approach is far more likely to get the corner cases right. 1573 if (CurContext->isDependentContext()) { 1574 ExprResult Init 1575 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1576 NumArgs, RParenLoc)); 1577 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1578 Constructor, Init.takeAs<Expr>(), 1579 RParenLoc); 1580 } 1581 1582 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1583 DelegationInit.takeAs<Expr>(), 1584 RParenLoc); 1585} 1586 1587MemInitResult 1588Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1589 Expr **Args, unsigned NumArgs, 1590 SourceLocation LParenLoc, SourceLocation RParenLoc, 1591 CXXRecordDecl *ClassDecl, 1592 SourceLocation EllipsisLoc) { 1593 bool HasDependentArg = false; 1594 for (unsigned i = 0; i < NumArgs; i++) 1595 HasDependentArg |= Args[i]->isTypeDependent(); 1596 1597 SourceLocation BaseLoc 1598 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1599 1600 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1601 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1602 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1603 1604 // C++ [class.base.init]p2: 1605 // [...] Unless the mem-initializer-id names a nonstatic data 1606 // member of the constructor's class or a direct or virtual base 1607 // of that class, the mem-initializer is ill-formed. A 1608 // mem-initializer-list can initialize a base class using any 1609 // name that denotes that base class type. 1610 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1611 1612 if (EllipsisLoc.isValid()) { 1613 // This is a pack expansion. 1614 if (!BaseType->containsUnexpandedParameterPack()) { 1615 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1616 << SourceRange(BaseLoc, RParenLoc); 1617 1618 EllipsisLoc = SourceLocation(); 1619 } 1620 } else { 1621 // Check for any unexpanded parameter packs. 1622 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1623 return true; 1624 1625 for (unsigned I = 0; I != NumArgs; ++I) 1626 if (DiagnoseUnexpandedParameterPack(Args[I])) 1627 return true; 1628 } 1629 1630 // Check for direct and virtual base classes. 1631 const CXXBaseSpecifier *DirectBaseSpec = 0; 1632 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1633 if (!Dependent) { 1634 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1635 BaseType)) 1636 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1637 LParenLoc, RParenLoc, ClassDecl); 1638 1639 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1640 VirtualBaseSpec); 1641 1642 // C++ [base.class.init]p2: 1643 // Unless the mem-initializer-id names a nonstatic data member of the 1644 // constructor's class or a direct or virtual base of that class, the 1645 // mem-initializer is ill-formed. 1646 if (!DirectBaseSpec && !VirtualBaseSpec) { 1647 // If the class has any dependent bases, then it's possible that 1648 // one of those types will resolve to the same type as 1649 // BaseType. Therefore, just treat this as a dependent base 1650 // class initialization. FIXME: Should we try to check the 1651 // initialization anyway? It seems odd. 1652 if (ClassDecl->hasAnyDependentBases()) 1653 Dependent = true; 1654 else 1655 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1656 << BaseType << Context.getTypeDeclType(ClassDecl) 1657 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1658 } 1659 } 1660 1661 if (Dependent) { 1662 // Can't check initialization for a base of dependent type or when 1663 // any of the arguments are type-dependent expressions. 1664 ExprResult BaseInit 1665 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1666 RParenLoc)); 1667 1668 // Erase any temporaries within this evaluation context; we're not 1669 // going to track them in the AST, since we'll be rebuilding the 1670 // ASTs during template instantiation. 1671 ExprTemporaries.erase( 1672 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1673 ExprTemporaries.end()); 1674 1675 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1676 /*IsVirtual=*/false, 1677 LParenLoc, 1678 BaseInit.takeAs<Expr>(), 1679 RParenLoc, 1680 EllipsisLoc); 1681 } 1682 1683 // C++ [base.class.init]p2: 1684 // If a mem-initializer-id is ambiguous because it designates both 1685 // a direct non-virtual base class and an inherited virtual base 1686 // class, the mem-initializer is ill-formed. 1687 if (DirectBaseSpec && VirtualBaseSpec) 1688 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1689 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1690 1691 CXXBaseSpecifier *BaseSpec 1692 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1693 if (!BaseSpec) 1694 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1695 1696 // Initialize the base. 1697 InitializedEntity BaseEntity = 1698 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1699 InitializationKind Kind = 1700 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1701 1702 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1703 1704 ExprResult BaseInit = 1705 InitSeq.Perform(*this, BaseEntity, Kind, 1706 MultiExprArg(*this, Args, NumArgs), 0); 1707 if (BaseInit.isInvalid()) 1708 return true; 1709 1710 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1711 1712 // C++0x [class.base.init]p7: 1713 // The initialization of each base and member constitutes a 1714 // full-expression. 1715 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1716 if (BaseInit.isInvalid()) 1717 return true; 1718 1719 // If we are in a dependent context, template instantiation will 1720 // perform this type-checking again. Just save the arguments that we 1721 // received in a ParenListExpr. 1722 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1723 // of the information that we have about the base 1724 // initializer. However, deconstructing the ASTs is a dicey process, 1725 // and this approach is far more likely to get the corner cases right. 1726 if (CurContext->isDependentContext()) { 1727 ExprResult Init 1728 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1729 RParenLoc)); 1730 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1731 BaseSpec->isVirtual(), 1732 LParenLoc, 1733 Init.takeAs<Expr>(), 1734 RParenLoc, 1735 EllipsisLoc); 1736 } 1737 1738 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1739 BaseSpec->isVirtual(), 1740 LParenLoc, 1741 BaseInit.takeAs<Expr>(), 1742 RParenLoc, 1743 EllipsisLoc); 1744} 1745 1746/// ImplicitInitializerKind - How an implicit base or member initializer should 1747/// initialize its base or member. 1748enum ImplicitInitializerKind { 1749 IIK_Default, 1750 IIK_Copy, 1751 IIK_Move 1752}; 1753 1754static bool 1755BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1756 ImplicitInitializerKind ImplicitInitKind, 1757 CXXBaseSpecifier *BaseSpec, 1758 bool IsInheritedVirtualBase, 1759 CXXCtorInitializer *&CXXBaseInit) { 1760 InitializedEntity InitEntity 1761 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1762 IsInheritedVirtualBase); 1763 1764 ExprResult BaseInit; 1765 1766 switch (ImplicitInitKind) { 1767 case IIK_Default: { 1768 InitializationKind InitKind 1769 = InitializationKind::CreateDefault(Constructor->getLocation()); 1770 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1771 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1772 MultiExprArg(SemaRef, 0, 0)); 1773 break; 1774 } 1775 1776 case IIK_Copy: { 1777 ParmVarDecl *Param = Constructor->getParamDecl(0); 1778 QualType ParamType = Param->getType().getNonReferenceType(); 1779 1780 Expr *CopyCtorArg = 1781 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1782 Constructor->getLocation(), ParamType, 1783 VK_LValue, 0); 1784 1785 // Cast to the base class to avoid ambiguities. 1786 QualType ArgTy = 1787 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1788 ParamType.getQualifiers()); 1789 1790 CXXCastPath BasePath; 1791 BasePath.push_back(BaseSpec); 1792 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1793 CK_UncheckedDerivedToBase, 1794 VK_LValue, &BasePath).take(); 1795 1796 InitializationKind InitKind 1797 = InitializationKind::CreateDirect(Constructor->getLocation(), 1798 SourceLocation(), SourceLocation()); 1799 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1800 &CopyCtorArg, 1); 1801 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1802 MultiExprArg(&CopyCtorArg, 1)); 1803 break; 1804 } 1805 1806 case IIK_Move: 1807 assert(false && "Unhandled initializer kind!"); 1808 } 1809 1810 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1811 if (BaseInit.isInvalid()) 1812 return true; 1813 1814 CXXBaseInit = 1815 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1816 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1817 SourceLocation()), 1818 BaseSpec->isVirtual(), 1819 SourceLocation(), 1820 BaseInit.takeAs<Expr>(), 1821 SourceLocation(), 1822 SourceLocation()); 1823 1824 return false; 1825} 1826 1827static bool 1828BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1829 ImplicitInitializerKind ImplicitInitKind, 1830 FieldDecl *Field, 1831 CXXCtorInitializer *&CXXMemberInit) { 1832 if (Field->isInvalidDecl()) 1833 return true; 1834 1835 SourceLocation Loc = Constructor->getLocation(); 1836 1837 if (ImplicitInitKind == IIK_Copy) { 1838 ParmVarDecl *Param = Constructor->getParamDecl(0); 1839 QualType ParamType = Param->getType().getNonReferenceType(); 1840 1841 Expr *MemberExprBase = 1842 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1843 Loc, ParamType, VK_LValue, 0); 1844 1845 // Build a reference to this field within the parameter. 1846 CXXScopeSpec SS; 1847 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1848 Sema::LookupMemberName); 1849 MemberLookup.addDecl(Field, AS_public); 1850 MemberLookup.resolveKind(); 1851 ExprResult CopyCtorArg 1852 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1853 ParamType, Loc, 1854 /*IsArrow=*/false, 1855 SS, 1856 /*FirstQualifierInScope=*/0, 1857 MemberLookup, 1858 /*TemplateArgs=*/0); 1859 if (CopyCtorArg.isInvalid()) 1860 return true; 1861 1862 // When the field we are copying is an array, create index variables for 1863 // each dimension of the array. We use these index variables to subscript 1864 // the source array, and other clients (e.g., CodeGen) will perform the 1865 // necessary iteration with these index variables. 1866 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1867 QualType BaseType = Field->getType(); 1868 QualType SizeType = SemaRef.Context.getSizeType(); 1869 while (const ConstantArrayType *Array 1870 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1871 // Create the iteration variable for this array index. 1872 IdentifierInfo *IterationVarName = 0; 1873 { 1874 llvm::SmallString<8> Str; 1875 llvm::raw_svector_ostream OS(Str); 1876 OS << "__i" << IndexVariables.size(); 1877 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1878 } 1879 VarDecl *IterationVar 1880 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1881 IterationVarName, SizeType, 1882 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1883 SC_None, SC_None); 1884 IndexVariables.push_back(IterationVar); 1885 1886 // Create a reference to the iteration variable. 1887 ExprResult IterationVarRef 1888 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1889 assert(!IterationVarRef.isInvalid() && 1890 "Reference to invented variable cannot fail!"); 1891 1892 // Subscript the array with this iteration variable. 1893 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1894 Loc, 1895 IterationVarRef.take(), 1896 Loc); 1897 if (CopyCtorArg.isInvalid()) 1898 return true; 1899 1900 BaseType = Array->getElementType(); 1901 } 1902 1903 // Construct the entity that we will be initializing. For an array, this 1904 // will be first element in the array, which may require several levels 1905 // of array-subscript entities. 1906 llvm::SmallVector<InitializedEntity, 4> Entities; 1907 Entities.reserve(1 + IndexVariables.size()); 1908 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1909 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1910 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1911 0, 1912 Entities.back())); 1913 1914 // Direct-initialize to use the copy constructor. 1915 InitializationKind InitKind = 1916 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1917 1918 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1919 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1920 &CopyCtorArgE, 1); 1921 1922 ExprResult MemberInit 1923 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1924 MultiExprArg(&CopyCtorArgE, 1)); 1925 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1926 if (MemberInit.isInvalid()) 1927 return true; 1928 1929 CXXMemberInit 1930 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1931 MemberInit.takeAs<Expr>(), Loc, 1932 IndexVariables.data(), 1933 IndexVariables.size()); 1934 return false; 1935 } 1936 1937 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1938 1939 QualType FieldBaseElementType = 1940 SemaRef.Context.getBaseElementType(Field->getType()); 1941 1942 if (FieldBaseElementType->isRecordType()) { 1943 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1944 InitializationKind InitKind = 1945 InitializationKind::CreateDefault(Loc); 1946 1947 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1948 ExprResult MemberInit = 1949 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1950 1951 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1952 if (MemberInit.isInvalid()) 1953 return true; 1954 1955 CXXMemberInit = 1956 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1957 Field, Loc, Loc, 1958 MemberInit.get(), 1959 Loc); 1960 return false; 1961 } 1962 1963 if (FieldBaseElementType->isReferenceType()) { 1964 SemaRef.Diag(Constructor->getLocation(), 1965 diag::err_uninitialized_member_in_ctor) 1966 << (int)Constructor->isImplicit() 1967 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1968 << 0 << Field->getDeclName(); 1969 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1970 return true; 1971 } 1972 1973 if (FieldBaseElementType.isConstQualified()) { 1974 SemaRef.Diag(Constructor->getLocation(), 1975 diag::err_uninitialized_member_in_ctor) 1976 << (int)Constructor->isImplicit() 1977 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1978 << 1 << Field->getDeclName(); 1979 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1980 return true; 1981 } 1982 1983 // Nothing to initialize. 1984 CXXMemberInit = 0; 1985 return false; 1986} 1987 1988namespace { 1989struct BaseAndFieldInfo { 1990 Sema &S; 1991 CXXConstructorDecl *Ctor; 1992 bool AnyErrorsInInits; 1993 ImplicitInitializerKind IIK; 1994 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 1995 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 1996 1997 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1998 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1999 // FIXME: Handle implicit move constructors. 2000 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2001 IIK = IIK_Copy; 2002 else 2003 IIK = IIK_Default; 2004 } 2005}; 2006} 2007 2008static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2009 FieldDecl *Top, FieldDecl *Field) { 2010 2011 // Overwhelmingly common case: we have a direct initializer for this field. 2012 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2013 Info.AllToInit.push_back(Init); 2014 return false; 2015 } 2016 2017 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2018 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2019 assert(FieldClassType && "anonymous struct/union without record type"); 2020 CXXRecordDecl *FieldClassDecl 2021 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2022 2023 // Even though union members never have non-trivial default 2024 // constructions in C++03, we still build member initializers for aggregate 2025 // record types which can be union members, and C++0x allows non-trivial 2026 // default constructors for union members, so we ensure that only one 2027 // member is initialized for these. 2028 if (FieldClassDecl->isUnion()) { 2029 // First check for an explicit initializer for one field. 2030 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2031 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2032 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2033 Info.AllToInit.push_back(Init); 2034 2035 // Once we've initialized a field of an anonymous union, the union 2036 // field in the class is also initialized, so exit immediately. 2037 return false; 2038 } else if ((*FA)->isAnonymousStructOrUnion()) { 2039 if (CollectFieldInitializer(Info, Top, *FA)) 2040 return true; 2041 } 2042 } 2043 2044 // Fallthrough and construct a default initializer for the union as 2045 // a whole, which can call its default constructor if such a thing exists 2046 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2047 // behavior going forward with C++0x, when anonymous unions there are 2048 // finalized, we should revisit this. 2049 } else { 2050 // For structs, we simply descend through to initialize all members where 2051 // necessary. 2052 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2053 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2054 if (CollectFieldInitializer(Info, Top, *FA)) 2055 return true; 2056 } 2057 } 2058 } 2059 2060 // Don't try to build an implicit initializer if there were semantic 2061 // errors in any of the initializers (and therefore we might be 2062 // missing some that the user actually wrote). 2063 if (Info.AnyErrorsInInits) 2064 return false; 2065 2066 CXXCtorInitializer *Init = 0; 2067 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2068 return true; 2069 2070 if (Init) 2071 Info.AllToInit.push_back(Init); 2072 2073 return false; 2074} 2075 2076bool 2077Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2078 CXXCtorInitializer *Initializer) { 2079 assert(Initializer->isDelegatingInitializer()); 2080 Constructor->setNumCtorInitializers(1); 2081 CXXCtorInitializer **initializer = 2082 new (Context) CXXCtorInitializer*[1]; 2083 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2084 Constructor->setCtorInitializers(initializer); 2085 2086 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2087 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2088 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2089 } 2090 2091 DelegatingCtorDecls.push_back(Constructor); 2092 2093 return false; 2094} 2095 2096bool 2097Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2098 CXXCtorInitializer **Initializers, 2099 unsigned NumInitializers, 2100 bool AnyErrors) { 2101 if (Constructor->getDeclContext()->isDependentContext()) { 2102 // Just store the initializers as written, they will be checked during 2103 // instantiation. 2104 if (NumInitializers > 0) { 2105 Constructor->setNumCtorInitializers(NumInitializers); 2106 CXXCtorInitializer **baseOrMemberInitializers = 2107 new (Context) CXXCtorInitializer*[NumInitializers]; 2108 memcpy(baseOrMemberInitializers, Initializers, 2109 NumInitializers * sizeof(CXXCtorInitializer*)); 2110 Constructor->setCtorInitializers(baseOrMemberInitializers); 2111 } 2112 2113 return false; 2114 } 2115 2116 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2117 2118 // We need to build the initializer AST according to order of construction 2119 // and not what user specified in the Initializers list. 2120 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2121 if (!ClassDecl) 2122 return true; 2123 2124 bool HadError = false; 2125 2126 for (unsigned i = 0; i < NumInitializers; i++) { 2127 CXXCtorInitializer *Member = Initializers[i]; 2128 2129 if (Member->isBaseInitializer()) 2130 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2131 else 2132 Info.AllBaseFields[Member->getAnyMember()] = Member; 2133 } 2134 2135 // Keep track of the direct virtual bases. 2136 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2137 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2138 E = ClassDecl->bases_end(); I != E; ++I) { 2139 if (I->isVirtual()) 2140 DirectVBases.insert(I); 2141 } 2142 2143 // Push virtual bases before others. 2144 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2145 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2146 2147 if (CXXCtorInitializer *Value 2148 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2149 Info.AllToInit.push_back(Value); 2150 } else if (!AnyErrors) { 2151 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2152 CXXCtorInitializer *CXXBaseInit; 2153 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2154 VBase, IsInheritedVirtualBase, 2155 CXXBaseInit)) { 2156 HadError = true; 2157 continue; 2158 } 2159 2160 Info.AllToInit.push_back(CXXBaseInit); 2161 } 2162 } 2163 2164 // Non-virtual bases. 2165 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2166 E = ClassDecl->bases_end(); Base != E; ++Base) { 2167 // Virtuals are in the virtual base list and already constructed. 2168 if (Base->isVirtual()) 2169 continue; 2170 2171 if (CXXCtorInitializer *Value 2172 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2173 Info.AllToInit.push_back(Value); 2174 } else if (!AnyErrors) { 2175 CXXCtorInitializer *CXXBaseInit; 2176 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2177 Base, /*IsInheritedVirtualBase=*/false, 2178 CXXBaseInit)) { 2179 HadError = true; 2180 continue; 2181 } 2182 2183 Info.AllToInit.push_back(CXXBaseInit); 2184 } 2185 } 2186 2187 // Fields. 2188 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2189 E = ClassDecl->field_end(); Field != E; ++Field) { 2190 if ((*Field)->getType()->isIncompleteArrayType()) { 2191 assert(ClassDecl->hasFlexibleArrayMember() && 2192 "Incomplete array type is not valid"); 2193 continue; 2194 } 2195 if (CollectFieldInitializer(Info, *Field, *Field)) 2196 HadError = true; 2197 } 2198 2199 NumInitializers = Info.AllToInit.size(); 2200 if (NumInitializers > 0) { 2201 Constructor->setNumCtorInitializers(NumInitializers); 2202 CXXCtorInitializer **baseOrMemberInitializers = 2203 new (Context) CXXCtorInitializer*[NumInitializers]; 2204 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2205 NumInitializers * sizeof(CXXCtorInitializer*)); 2206 Constructor->setCtorInitializers(baseOrMemberInitializers); 2207 2208 // Constructors implicitly reference the base and member 2209 // destructors. 2210 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2211 Constructor->getParent()); 2212 } 2213 2214 return HadError; 2215} 2216 2217static void *GetKeyForTopLevelField(FieldDecl *Field) { 2218 // For anonymous unions, use the class declaration as the key. 2219 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2220 if (RT->getDecl()->isAnonymousStructOrUnion()) 2221 return static_cast<void *>(RT->getDecl()); 2222 } 2223 return static_cast<void *>(Field); 2224} 2225 2226static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2227 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2228} 2229 2230static void *GetKeyForMember(ASTContext &Context, 2231 CXXCtorInitializer *Member) { 2232 if (!Member->isAnyMemberInitializer()) 2233 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2234 2235 // For fields injected into the class via declaration of an anonymous union, 2236 // use its anonymous union class declaration as the unique key. 2237 FieldDecl *Field = Member->getAnyMember(); 2238 2239 // If the field is a member of an anonymous struct or union, our key 2240 // is the anonymous record decl that's a direct child of the class. 2241 RecordDecl *RD = Field->getParent(); 2242 if (RD->isAnonymousStructOrUnion()) { 2243 while (true) { 2244 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2245 if (Parent->isAnonymousStructOrUnion()) 2246 RD = Parent; 2247 else 2248 break; 2249 } 2250 2251 return static_cast<void *>(RD); 2252 } 2253 2254 return static_cast<void *>(Field); 2255} 2256 2257static void 2258DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2259 const CXXConstructorDecl *Constructor, 2260 CXXCtorInitializer **Inits, 2261 unsigned NumInits) { 2262 if (Constructor->getDeclContext()->isDependentContext()) 2263 return; 2264 2265 // Don't check initializers order unless the warning is enabled at the 2266 // location of at least one initializer. 2267 bool ShouldCheckOrder = false; 2268 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2269 CXXCtorInitializer *Init = Inits[InitIndex]; 2270 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2271 Init->getSourceLocation()) 2272 != Diagnostic::Ignored) { 2273 ShouldCheckOrder = true; 2274 break; 2275 } 2276 } 2277 if (!ShouldCheckOrder) 2278 return; 2279 2280 // Build the list of bases and members in the order that they'll 2281 // actually be initialized. The explicit initializers should be in 2282 // this same order but may be missing things. 2283 llvm::SmallVector<const void*, 32> IdealInitKeys; 2284 2285 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2286 2287 // 1. Virtual bases. 2288 for (CXXRecordDecl::base_class_const_iterator VBase = 2289 ClassDecl->vbases_begin(), 2290 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2291 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2292 2293 // 2. Non-virtual bases. 2294 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2295 E = ClassDecl->bases_end(); Base != E; ++Base) { 2296 if (Base->isVirtual()) 2297 continue; 2298 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2299 } 2300 2301 // 3. Direct fields. 2302 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2303 E = ClassDecl->field_end(); Field != E; ++Field) 2304 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2305 2306 unsigned NumIdealInits = IdealInitKeys.size(); 2307 unsigned IdealIndex = 0; 2308 2309 CXXCtorInitializer *PrevInit = 0; 2310 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2311 CXXCtorInitializer *Init = Inits[InitIndex]; 2312 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2313 2314 // Scan forward to try to find this initializer in the idealized 2315 // initializers list. 2316 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2317 if (InitKey == IdealInitKeys[IdealIndex]) 2318 break; 2319 2320 // If we didn't find this initializer, it must be because we 2321 // scanned past it on a previous iteration. That can only 2322 // happen if we're out of order; emit a warning. 2323 if (IdealIndex == NumIdealInits && PrevInit) { 2324 Sema::SemaDiagnosticBuilder D = 2325 SemaRef.Diag(PrevInit->getSourceLocation(), 2326 diag::warn_initializer_out_of_order); 2327 2328 if (PrevInit->isAnyMemberInitializer()) 2329 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2330 else 2331 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2332 2333 if (Init->isAnyMemberInitializer()) 2334 D << 0 << Init->getAnyMember()->getDeclName(); 2335 else 2336 D << 1 << Init->getBaseClassInfo()->getType(); 2337 2338 // Move back to the initializer's location in the ideal list. 2339 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2340 if (InitKey == IdealInitKeys[IdealIndex]) 2341 break; 2342 2343 assert(IdealIndex != NumIdealInits && 2344 "initializer not found in initializer list"); 2345 } 2346 2347 PrevInit = Init; 2348 } 2349} 2350 2351namespace { 2352bool CheckRedundantInit(Sema &S, 2353 CXXCtorInitializer *Init, 2354 CXXCtorInitializer *&PrevInit) { 2355 if (!PrevInit) { 2356 PrevInit = Init; 2357 return false; 2358 } 2359 2360 if (FieldDecl *Field = Init->getMember()) 2361 S.Diag(Init->getSourceLocation(), 2362 diag::err_multiple_mem_initialization) 2363 << Field->getDeclName() 2364 << Init->getSourceRange(); 2365 else { 2366 const Type *BaseClass = Init->getBaseClass(); 2367 assert(BaseClass && "neither field nor base"); 2368 S.Diag(Init->getSourceLocation(), 2369 diag::err_multiple_base_initialization) 2370 << QualType(BaseClass, 0) 2371 << Init->getSourceRange(); 2372 } 2373 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2374 << 0 << PrevInit->getSourceRange(); 2375 2376 return true; 2377} 2378 2379typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2380typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2381 2382bool CheckRedundantUnionInit(Sema &S, 2383 CXXCtorInitializer *Init, 2384 RedundantUnionMap &Unions) { 2385 FieldDecl *Field = Init->getAnyMember(); 2386 RecordDecl *Parent = Field->getParent(); 2387 if (!Parent->isAnonymousStructOrUnion()) 2388 return false; 2389 2390 NamedDecl *Child = Field; 2391 do { 2392 if (Parent->isUnion()) { 2393 UnionEntry &En = Unions[Parent]; 2394 if (En.first && En.first != Child) { 2395 S.Diag(Init->getSourceLocation(), 2396 diag::err_multiple_mem_union_initialization) 2397 << Field->getDeclName() 2398 << Init->getSourceRange(); 2399 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2400 << 0 << En.second->getSourceRange(); 2401 return true; 2402 } else if (!En.first) { 2403 En.first = Child; 2404 En.second = Init; 2405 } 2406 } 2407 2408 Child = Parent; 2409 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2410 } while (Parent->isAnonymousStructOrUnion()); 2411 2412 return false; 2413} 2414} 2415 2416/// ActOnMemInitializers - Handle the member initializers for a constructor. 2417void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2418 SourceLocation ColonLoc, 2419 MemInitTy **meminits, unsigned NumMemInits, 2420 bool AnyErrors) { 2421 if (!ConstructorDecl) 2422 return; 2423 2424 AdjustDeclIfTemplate(ConstructorDecl); 2425 2426 CXXConstructorDecl *Constructor 2427 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2428 2429 if (!Constructor) { 2430 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2431 return; 2432 } 2433 2434 CXXCtorInitializer **MemInits = 2435 reinterpret_cast<CXXCtorInitializer **>(meminits); 2436 2437 // Mapping for the duplicate initializers check. 2438 // For member initializers, this is keyed with a FieldDecl*. 2439 // For base initializers, this is keyed with a Type*. 2440 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2441 2442 // Mapping for the inconsistent anonymous-union initializers check. 2443 RedundantUnionMap MemberUnions; 2444 2445 bool HadError = false; 2446 for (unsigned i = 0; i < NumMemInits; i++) { 2447 CXXCtorInitializer *Init = MemInits[i]; 2448 2449 // Set the source order index. 2450 Init->setSourceOrder(i); 2451 2452 if (Init->isAnyMemberInitializer()) { 2453 FieldDecl *Field = Init->getAnyMember(); 2454 if (CheckRedundantInit(*this, Init, Members[Field]) || 2455 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2456 HadError = true; 2457 } else if (Init->isBaseInitializer()) { 2458 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2459 if (CheckRedundantInit(*this, Init, Members[Key])) 2460 HadError = true; 2461 } else { 2462 assert(Init->isDelegatingInitializer()); 2463 // This must be the only initializer 2464 if (i != 0 || NumMemInits > 1) { 2465 Diag(MemInits[0]->getSourceLocation(), 2466 diag::err_delegating_initializer_alone) 2467 << MemInits[0]->getSourceRange(); 2468 HadError = true; 2469 // We will treat this as being the only initializer. 2470 } 2471 SetDelegatingInitializer(Constructor, MemInits[i]); 2472 // Return immediately as the initializer is set. 2473 return; 2474 } 2475 } 2476 2477 if (HadError) 2478 return; 2479 2480 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2481 2482 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2483} 2484 2485void 2486Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2487 CXXRecordDecl *ClassDecl) { 2488 // Ignore dependent contexts. 2489 if (ClassDecl->isDependentContext()) 2490 return; 2491 2492 // FIXME: all the access-control diagnostics are positioned on the 2493 // field/base declaration. That's probably good; that said, the 2494 // user might reasonably want to know why the destructor is being 2495 // emitted, and we currently don't say. 2496 2497 // Non-static data members. 2498 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2499 E = ClassDecl->field_end(); I != E; ++I) { 2500 FieldDecl *Field = *I; 2501 if (Field->isInvalidDecl()) 2502 continue; 2503 QualType FieldType = Context.getBaseElementType(Field->getType()); 2504 2505 const RecordType* RT = FieldType->getAs<RecordType>(); 2506 if (!RT) 2507 continue; 2508 2509 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2510 if (FieldClassDecl->isInvalidDecl()) 2511 continue; 2512 if (FieldClassDecl->hasTrivialDestructor()) 2513 continue; 2514 2515 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2516 assert(Dtor && "No dtor found for FieldClassDecl!"); 2517 CheckDestructorAccess(Field->getLocation(), Dtor, 2518 PDiag(diag::err_access_dtor_field) 2519 << Field->getDeclName() 2520 << FieldType); 2521 2522 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2523 } 2524 2525 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2526 2527 // Bases. 2528 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2529 E = ClassDecl->bases_end(); Base != E; ++Base) { 2530 // Bases are always records in a well-formed non-dependent class. 2531 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2532 2533 // Remember direct virtual bases. 2534 if (Base->isVirtual()) 2535 DirectVirtualBases.insert(RT); 2536 2537 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2538 // If our base class is invalid, we probably can't get its dtor anyway. 2539 if (BaseClassDecl->isInvalidDecl()) 2540 continue; 2541 // Ignore trivial destructors. 2542 if (BaseClassDecl->hasTrivialDestructor()) 2543 continue; 2544 2545 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2546 assert(Dtor && "No dtor found for BaseClassDecl!"); 2547 2548 // FIXME: caret should be on the start of the class name 2549 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2550 PDiag(diag::err_access_dtor_base) 2551 << Base->getType() 2552 << Base->getSourceRange()); 2553 2554 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2555 } 2556 2557 // Virtual bases. 2558 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2559 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2560 2561 // Bases are always records in a well-formed non-dependent class. 2562 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2563 2564 // Ignore direct virtual bases. 2565 if (DirectVirtualBases.count(RT)) 2566 continue; 2567 2568 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2569 // If our base class is invalid, we probably can't get its dtor anyway. 2570 if (BaseClassDecl->isInvalidDecl()) 2571 continue; 2572 // Ignore trivial destructors. 2573 if (BaseClassDecl->hasTrivialDestructor()) 2574 continue; 2575 2576 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2577 assert(Dtor && "No dtor found for BaseClassDecl!"); 2578 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2579 PDiag(diag::err_access_dtor_vbase) 2580 << VBase->getType()); 2581 2582 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2583 } 2584} 2585 2586void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2587 if (!CDtorDecl) 2588 return; 2589 2590 if (CXXConstructorDecl *Constructor 2591 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2592 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2593} 2594 2595bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2596 unsigned DiagID, AbstractDiagSelID SelID) { 2597 if (SelID == -1) 2598 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2599 else 2600 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2601} 2602 2603bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2604 const PartialDiagnostic &PD) { 2605 if (!getLangOptions().CPlusPlus) 2606 return false; 2607 2608 if (const ArrayType *AT = Context.getAsArrayType(T)) 2609 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2610 2611 if (const PointerType *PT = T->getAs<PointerType>()) { 2612 // Find the innermost pointer type. 2613 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2614 PT = T; 2615 2616 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2617 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2618 } 2619 2620 const RecordType *RT = T->getAs<RecordType>(); 2621 if (!RT) 2622 return false; 2623 2624 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2625 2626 // We can't answer whether something is abstract until it has a 2627 // definition. If it's currently being defined, we'll walk back 2628 // over all the declarations when we have a full definition. 2629 const CXXRecordDecl *Def = RD->getDefinition(); 2630 if (!Def || Def->isBeingDefined()) 2631 return false; 2632 2633 if (!RD->isAbstract()) 2634 return false; 2635 2636 Diag(Loc, PD) << RD->getDeclName(); 2637 DiagnoseAbstractType(RD); 2638 2639 return true; 2640} 2641 2642void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2643 // Check if we've already emitted the list of pure virtual functions 2644 // for this class. 2645 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2646 return; 2647 2648 CXXFinalOverriderMap FinalOverriders; 2649 RD->getFinalOverriders(FinalOverriders); 2650 2651 // Keep a set of seen pure methods so we won't diagnose the same method 2652 // more than once. 2653 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2654 2655 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2656 MEnd = FinalOverriders.end(); 2657 M != MEnd; 2658 ++M) { 2659 for (OverridingMethods::iterator SO = M->second.begin(), 2660 SOEnd = M->second.end(); 2661 SO != SOEnd; ++SO) { 2662 // C++ [class.abstract]p4: 2663 // A class is abstract if it contains or inherits at least one 2664 // pure virtual function for which the final overrider is pure 2665 // virtual. 2666 2667 // 2668 if (SO->second.size() != 1) 2669 continue; 2670 2671 if (!SO->second.front().Method->isPure()) 2672 continue; 2673 2674 if (!SeenPureMethods.insert(SO->second.front().Method)) 2675 continue; 2676 2677 Diag(SO->second.front().Method->getLocation(), 2678 diag::note_pure_virtual_function) 2679 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2680 } 2681 } 2682 2683 if (!PureVirtualClassDiagSet) 2684 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2685 PureVirtualClassDiagSet->insert(RD); 2686} 2687 2688namespace { 2689struct AbstractUsageInfo { 2690 Sema &S; 2691 CXXRecordDecl *Record; 2692 CanQualType AbstractType; 2693 bool Invalid; 2694 2695 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2696 : S(S), Record(Record), 2697 AbstractType(S.Context.getCanonicalType( 2698 S.Context.getTypeDeclType(Record))), 2699 Invalid(false) {} 2700 2701 void DiagnoseAbstractType() { 2702 if (Invalid) return; 2703 S.DiagnoseAbstractType(Record); 2704 Invalid = true; 2705 } 2706 2707 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2708}; 2709 2710struct CheckAbstractUsage { 2711 AbstractUsageInfo &Info; 2712 const NamedDecl *Ctx; 2713 2714 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2715 : Info(Info), Ctx(Ctx) {} 2716 2717 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2718 switch (TL.getTypeLocClass()) { 2719#define ABSTRACT_TYPELOC(CLASS, PARENT) 2720#define TYPELOC(CLASS, PARENT) \ 2721 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2722#include "clang/AST/TypeLocNodes.def" 2723 } 2724 } 2725 2726 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2727 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2728 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2729 if (!TL.getArg(I)) 2730 continue; 2731 2732 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2733 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2734 } 2735 } 2736 2737 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2738 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2739 } 2740 2741 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2742 // Visit the type parameters from a permissive context. 2743 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2744 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2745 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2746 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2747 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2748 // TODO: other template argument types? 2749 } 2750 } 2751 2752 // Visit pointee types from a permissive context. 2753#define CheckPolymorphic(Type) \ 2754 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2755 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2756 } 2757 CheckPolymorphic(PointerTypeLoc) 2758 CheckPolymorphic(ReferenceTypeLoc) 2759 CheckPolymorphic(MemberPointerTypeLoc) 2760 CheckPolymorphic(BlockPointerTypeLoc) 2761 2762 /// Handle all the types we haven't given a more specific 2763 /// implementation for above. 2764 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2765 // Every other kind of type that we haven't called out already 2766 // that has an inner type is either (1) sugar or (2) contains that 2767 // inner type in some way as a subobject. 2768 if (TypeLoc Next = TL.getNextTypeLoc()) 2769 return Visit(Next, Sel); 2770 2771 // If there's no inner type and we're in a permissive context, 2772 // don't diagnose. 2773 if (Sel == Sema::AbstractNone) return; 2774 2775 // Check whether the type matches the abstract type. 2776 QualType T = TL.getType(); 2777 if (T->isArrayType()) { 2778 Sel = Sema::AbstractArrayType; 2779 T = Info.S.Context.getBaseElementType(T); 2780 } 2781 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2782 if (CT != Info.AbstractType) return; 2783 2784 // It matched; do some magic. 2785 if (Sel == Sema::AbstractArrayType) { 2786 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2787 << T << TL.getSourceRange(); 2788 } else { 2789 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2790 << Sel << T << TL.getSourceRange(); 2791 } 2792 Info.DiagnoseAbstractType(); 2793 } 2794}; 2795 2796void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2797 Sema::AbstractDiagSelID Sel) { 2798 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2799} 2800 2801} 2802 2803/// Check for invalid uses of an abstract type in a method declaration. 2804static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2805 CXXMethodDecl *MD) { 2806 // No need to do the check on definitions, which require that 2807 // the return/param types be complete. 2808 if (MD->doesThisDeclarationHaveABody()) 2809 return; 2810 2811 // For safety's sake, just ignore it if we don't have type source 2812 // information. This should never happen for non-implicit methods, 2813 // but... 2814 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2815 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2816} 2817 2818/// Check for invalid uses of an abstract type within a class definition. 2819static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2820 CXXRecordDecl *RD) { 2821 for (CXXRecordDecl::decl_iterator 2822 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2823 Decl *D = *I; 2824 if (D->isImplicit()) continue; 2825 2826 // Methods and method templates. 2827 if (isa<CXXMethodDecl>(D)) { 2828 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2829 } else if (isa<FunctionTemplateDecl>(D)) { 2830 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2831 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2832 2833 // Fields and static variables. 2834 } else if (isa<FieldDecl>(D)) { 2835 FieldDecl *FD = cast<FieldDecl>(D); 2836 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2837 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2838 } else if (isa<VarDecl>(D)) { 2839 VarDecl *VD = cast<VarDecl>(D); 2840 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2841 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2842 2843 // Nested classes and class templates. 2844 } else if (isa<CXXRecordDecl>(D)) { 2845 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2846 } else if (isa<ClassTemplateDecl>(D)) { 2847 CheckAbstractClassUsage(Info, 2848 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2849 } 2850 } 2851} 2852 2853/// \brief Perform semantic checks on a class definition that has been 2854/// completing, introducing implicitly-declared members, checking for 2855/// abstract types, etc. 2856void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2857 if (!Record) 2858 return; 2859 2860 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2861 AbstractUsageInfo Info(*this, Record); 2862 CheckAbstractClassUsage(Info, Record); 2863 } 2864 2865 // If this is not an aggregate type and has no user-declared constructor, 2866 // complain about any non-static data members of reference or const scalar 2867 // type, since they will never get initializers. 2868 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2869 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2870 bool Complained = false; 2871 for (RecordDecl::field_iterator F = Record->field_begin(), 2872 FEnd = Record->field_end(); 2873 F != FEnd; ++F) { 2874 if (F->getType()->isReferenceType() || 2875 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2876 if (!Complained) { 2877 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2878 << Record->getTagKind() << Record; 2879 Complained = true; 2880 } 2881 2882 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2883 << F->getType()->isReferenceType() 2884 << F->getDeclName(); 2885 } 2886 } 2887 } 2888 2889 if (Record->isDynamicClass() && !Record->isDependentType()) 2890 DynamicClasses.push_back(Record); 2891 2892 if (Record->getIdentifier()) { 2893 // C++ [class.mem]p13: 2894 // If T is the name of a class, then each of the following shall have a 2895 // name different from T: 2896 // - every member of every anonymous union that is a member of class T. 2897 // 2898 // C++ [class.mem]p14: 2899 // In addition, if class T has a user-declared constructor (12.1), every 2900 // non-static data member of class T shall have a name different from T. 2901 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2902 R.first != R.second; ++R.first) { 2903 NamedDecl *D = *R.first; 2904 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2905 isa<IndirectFieldDecl>(D)) { 2906 Diag(D->getLocation(), diag::err_member_name_of_class) 2907 << D->getDeclName(); 2908 break; 2909 } 2910 } 2911 } 2912 2913 // Warn if the class has virtual methods but non-virtual public destructor. 2914 if (Record->isPolymorphic() && !Record->isDependentType()) { 2915 CXXDestructorDecl *dtor = Record->getDestructor(); 2916 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2917 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2918 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2919 } 2920 2921 // See if a method overloads virtual methods in a base 2922 /// class without overriding any. 2923 if (!Record->isDependentType()) { 2924 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2925 MEnd = Record->method_end(); 2926 M != MEnd; ++M) { 2927 if (!(*M)->isStatic()) 2928 DiagnoseHiddenVirtualMethods(Record, *M); 2929 } 2930 } 2931 2932 // Declare inherited constructors. We do this eagerly here because: 2933 // - The standard requires an eager diagnostic for conflicting inherited 2934 // constructors from different classes. 2935 // - The lazy declaration of the other implicit constructors is so as to not 2936 // waste space and performance on classes that are not meant to be 2937 // instantiated (e.g. meta-functions). This doesn't apply to classes that 2938 // have inherited constructors. 2939 DeclareInheritedConstructors(Record); 2940} 2941 2942/// \brief Data used with FindHiddenVirtualMethod 2943namespace { 2944 struct FindHiddenVirtualMethodData { 2945 Sema *S; 2946 CXXMethodDecl *Method; 2947 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 2948 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 2949 }; 2950} 2951 2952/// \brief Member lookup function that determines whether a given C++ 2953/// method overloads virtual methods in a base class without overriding any, 2954/// to be used with CXXRecordDecl::lookupInBases(). 2955static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 2956 CXXBasePath &Path, 2957 void *UserData) { 2958 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2959 2960 FindHiddenVirtualMethodData &Data 2961 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 2962 2963 DeclarationName Name = Data.Method->getDeclName(); 2964 assert(Name.getNameKind() == DeclarationName::Identifier); 2965 2966 bool foundSameNameMethod = false; 2967 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 2968 for (Path.Decls = BaseRecord->lookup(Name); 2969 Path.Decls.first != Path.Decls.second; 2970 ++Path.Decls.first) { 2971 NamedDecl *D = *Path.Decls.first; 2972 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2973 MD = MD->getCanonicalDecl(); 2974 foundSameNameMethod = true; 2975 // Interested only in hidden virtual methods. 2976 if (!MD->isVirtual()) 2977 continue; 2978 // If the method we are checking overrides a method from its base 2979 // don't warn about the other overloaded methods. 2980 if (!Data.S->IsOverload(Data.Method, MD, false)) 2981 return true; 2982 // Collect the overload only if its hidden. 2983 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 2984 overloadedMethods.push_back(MD); 2985 } 2986 } 2987 2988 if (foundSameNameMethod) 2989 Data.OverloadedMethods.append(overloadedMethods.begin(), 2990 overloadedMethods.end()); 2991 return foundSameNameMethod; 2992} 2993 2994/// \brief See if a method overloads virtual methods in a base class without 2995/// overriding any. 2996void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2997 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 2998 MD->getLocation()) == Diagnostic::Ignored) 2999 return; 3000 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 3001 return; 3002 3003 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3004 /*bool RecordPaths=*/false, 3005 /*bool DetectVirtual=*/false); 3006 FindHiddenVirtualMethodData Data; 3007 Data.Method = MD; 3008 Data.S = this; 3009 3010 // Keep the base methods that were overriden or introduced in the subclass 3011 // by 'using' in a set. A base method not in this set is hidden. 3012 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3013 res.first != res.second; ++res.first) { 3014 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3015 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3016 E = MD->end_overridden_methods(); 3017 I != E; ++I) 3018 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3019 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3020 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3021 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3022 } 3023 3024 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3025 !Data.OverloadedMethods.empty()) { 3026 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3027 << MD << (Data.OverloadedMethods.size() > 1); 3028 3029 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3030 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3031 Diag(overloadedMD->getLocation(), 3032 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3033 } 3034 } 3035} 3036 3037void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3038 Decl *TagDecl, 3039 SourceLocation LBrac, 3040 SourceLocation RBrac, 3041 AttributeList *AttrList) { 3042 if (!TagDecl) 3043 return; 3044 3045 AdjustDeclIfTemplate(TagDecl); 3046 3047 ActOnFields(S, RLoc, TagDecl, 3048 // strict aliasing violation! 3049 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3050 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3051 3052 CheckCompletedCXXClass( 3053 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3054} 3055 3056namespace { 3057 /// \brief Helper class that collects exception specifications for 3058 /// implicitly-declared special member functions. 3059 class ImplicitExceptionSpecification { 3060 ASTContext &Context; 3061 // We order exception specifications thus: 3062 // noexcept is the most restrictive, but is only used in C++0x. 3063 // throw() comes next. 3064 // Then a throw(collected exceptions) 3065 // Finally no specification. 3066 // throw(...) is used instead if any called function uses it. 3067 ExceptionSpecificationType ComputedEST; 3068 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 3069 llvm::SmallVector<QualType, 4> Exceptions; 3070 3071 void ClearExceptions() { 3072 ExceptionsSeen.clear(); 3073 Exceptions.clear(); 3074 } 3075 3076 public: 3077 explicit ImplicitExceptionSpecification(ASTContext &Context) 3078 : Context(Context), ComputedEST(EST_BasicNoexcept) { 3079 if (!Context.getLangOptions().CPlusPlus0x) 3080 ComputedEST = EST_DynamicNone; 3081 } 3082 3083 /// \brief Get the computed exception specification type. 3084 ExceptionSpecificationType getExceptionSpecType() const { 3085 assert(ComputedEST != EST_ComputedNoexcept && 3086 "noexcept(expr) should not be a possible result"); 3087 return ComputedEST; 3088 } 3089 3090 /// \brief The number of exceptions in the exception specification. 3091 unsigned size() const { return Exceptions.size(); } 3092 3093 /// \brief The set of exceptions in the exception specification. 3094 const QualType *data() const { return Exceptions.data(); } 3095 3096 /// \brief Integrate another called method into the collected data. 3097 void CalledDecl(CXXMethodDecl *Method) { 3098 // If we have an MSAny spec already, don't bother. 3099 if (!Method || ComputedEST == EST_MSAny) 3100 return; 3101 3102 const FunctionProtoType *Proto 3103 = Method->getType()->getAs<FunctionProtoType>(); 3104 3105 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 3106 3107 // If this function can throw any exceptions, make a note of that. 3108 if (EST == EST_MSAny || EST == EST_None) { 3109 ClearExceptions(); 3110 ComputedEST = EST; 3111 return; 3112 } 3113 3114 // If this function has a basic noexcept, it doesn't affect the outcome. 3115 if (EST == EST_BasicNoexcept) 3116 return; 3117 3118 // If we have a throw-all spec at this point, ignore the function. 3119 if (ComputedEST == EST_None) 3120 return; 3121 3122 // If we're still at noexcept(true) and there's a nothrow() callee, 3123 // change to that specification. 3124 if (EST == EST_DynamicNone) { 3125 if (ComputedEST == EST_BasicNoexcept) 3126 ComputedEST = EST_DynamicNone; 3127 return; 3128 } 3129 3130 // Check out noexcept specs. 3131 if (EST == EST_ComputedNoexcept) { 3132 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 3133 assert(NR != FunctionProtoType::NR_NoNoexcept && 3134 "Must have noexcept result for EST_ComputedNoexcept."); 3135 assert(NR != FunctionProtoType::NR_Dependent && 3136 "Should not generate implicit declarations for dependent cases, " 3137 "and don't know how to handle them anyway."); 3138 3139 // noexcept(false) -> no spec on the new function 3140 if (NR == FunctionProtoType::NR_Throw) { 3141 ClearExceptions(); 3142 ComputedEST = EST_None; 3143 } 3144 // noexcept(true) won't change anything either. 3145 return; 3146 } 3147 3148 assert(EST == EST_Dynamic && "EST case not considered earlier."); 3149 assert(ComputedEST != EST_None && 3150 "Shouldn't collect exceptions when throw-all is guaranteed."); 3151 ComputedEST = EST_Dynamic; 3152 // Record the exceptions in this function's exception specification. 3153 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 3154 EEnd = Proto->exception_end(); 3155 E != EEnd; ++E) 3156 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 3157 Exceptions.push_back(*E); 3158 } 3159 }; 3160} 3161 3162 3163/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3164/// special functions, such as the default constructor, copy 3165/// constructor, or destructor, to the given C++ class (C++ 3166/// [special]p1). This routine can only be executed just before the 3167/// definition of the class is complete. 3168void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3169 if (!ClassDecl->hasUserDeclaredConstructor()) 3170 ++ASTContext::NumImplicitDefaultConstructors; 3171 3172 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3173 ++ASTContext::NumImplicitCopyConstructors; 3174 3175 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3176 ++ASTContext::NumImplicitCopyAssignmentOperators; 3177 3178 // If we have a dynamic class, then the copy assignment operator may be 3179 // virtual, so we have to declare it immediately. This ensures that, e.g., 3180 // it shows up in the right place in the vtable and that we diagnose 3181 // problems with the implicit exception specification. 3182 if (ClassDecl->isDynamicClass()) 3183 DeclareImplicitCopyAssignment(ClassDecl); 3184 } 3185 3186 if (!ClassDecl->hasUserDeclaredDestructor()) { 3187 ++ASTContext::NumImplicitDestructors; 3188 3189 // If we have a dynamic class, then the destructor may be virtual, so we 3190 // have to declare the destructor immediately. This ensures that, e.g., it 3191 // shows up in the right place in the vtable and that we diagnose problems 3192 // with the implicit exception specification. 3193 if (ClassDecl->isDynamicClass()) 3194 DeclareImplicitDestructor(ClassDecl); 3195 } 3196} 3197 3198void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3199 if (!D) 3200 return; 3201 3202 int NumParamList = D->getNumTemplateParameterLists(); 3203 for (int i = 0; i < NumParamList; i++) { 3204 TemplateParameterList* Params = D->getTemplateParameterList(i); 3205 for (TemplateParameterList::iterator Param = Params->begin(), 3206 ParamEnd = Params->end(); 3207 Param != ParamEnd; ++Param) { 3208 NamedDecl *Named = cast<NamedDecl>(*Param); 3209 if (Named->getDeclName()) { 3210 S->AddDecl(Named); 3211 IdResolver.AddDecl(Named); 3212 } 3213 } 3214 } 3215} 3216 3217void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3218 if (!D) 3219 return; 3220 3221 TemplateParameterList *Params = 0; 3222 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3223 Params = Template->getTemplateParameters(); 3224 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3225 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3226 Params = PartialSpec->getTemplateParameters(); 3227 else 3228 return; 3229 3230 for (TemplateParameterList::iterator Param = Params->begin(), 3231 ParamEnd = Params->end(); 3232 Param != ParamEnd; ++Param) { 3233 NamedDecl *Named = cast<NamedDecl>(*Param); 3234 if (Named->getDeclName()) { 3235 S->AddDecl(Named); 3236 IdResolver.AddDecl(Named); 3237 } 3238 } 3239} 3240 3241void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3242 if (!RecordD) return; 3243 AdjustDeclIfTemplate(RecordD); 3244 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3245 PushDeclContext(S, Record); 3246} 3247 3248void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3249 if (!RecordD) return; 3250 PopDeclContext(); 3251} 3252 3253/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3254/// parsing a top-level (non-nested) C++ class, and we are now 3255/// parsing those parts of the given Method declaration that could 3256/// not be parsed earlier (C++ [class.mem]p2), such as default 3257/// arguments. This action should enter the scope of the given 3258/// Method declaration as if we had just parsed the qualified method 3259/// name. However, it should not bring the parameters into scope; 3260/// that will be performed by ActOnDelayedCXXMethodParameter. 3261void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3262} 3263 3264/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3265/// C++ method declaration. We're (re-)introducing the given 3266/// function parameter into scope for use in parsing later parts of 3267/// the method declaration. For example, we could see an 3268/// ActOnParamDefaultArgument event for this parameter. 3269void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3270 if (!ParamD) 3271 return; 3272 3273 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3274 3275 // If this parameter has an unparsed default argument, clear it out 3276 // to make way for the parsed default argument. 3277 if (Param->hasUnparsedDefaultArg()) 3278 Param->setDefaultArg(0); 3279 3280 S->AddDecl(Param); 3281 if (Param->getDeclName()) 3282 IdResolver.AddDecl(Param); 3283} 3284 3285/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3286/// processing the delayed method declaration for Method. The method 3287/// declaration is now considered finished. There may be a separate 3288/// ActOnStartOfFunctionDef action later (not necessarily 3289/// immediately!) for this method, if it was also defined inside the 3290/// class body. 3291void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3292 if (!MethodD) 3293 return; 3294 3295 AdjustDeclIfTemplate(MethodD); 3296 3297 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3298 3299 // Now that we have our default arguments, check the constructor 3300 // again. It could produce additional diagnostics or affect whether 3301 // the class has implicitly-declared destructors, among other 3302 // things. 3303 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3304 CheckConstructor(Constructor); 3305 3306 // Check the default arguments, which we may have added. 3307 if (!Method->isInvalidDecl()) 3308 CheckCXXDefaultArguments(Method); 3309} 3310 3311/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3312/// the well-formedness of the constructor declarator @p D with type @p 3313/// R. If there are any errors in the declarator, this routine will 3314/// emit diagnostics and set the invalid bit to true. In any case, the type 3315/// will be updated to reflect a well-formed type for the constructor and 3316/// returned. 3317QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3318 StorageClass &SC) { 3319 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3320 3321 // C++ [class.ctor]p3: 3322 // A constructor shall not be virtual (10.3) or static (9.4). A 3323 // constructor can be invoked for a const, volatile or const 3324 // volatile object. A constructor shall not be declared const, 3325 // volatile, or const volatile (9.3.2). 3326 if (isVirtual) { 3327 if (!D.isInvalidType()) 3328 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3329 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3330 << SourceRange(D.getIdentifierLoc()); 3331 D.setInvalidType(); 3332 } 3333 if (SC == SC_Static) { 3334 if (!D.isInvalidType()) 3335 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3336 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3337 << SourceRange(D.getIdentifierLoc()); 3338 D.setInvalidType(); 3339 SC = SC_None; 3340 } 3341 3342 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3343 if (FTI.TypeQuals != 0) { 3344 if (FTI.TypeQuals & Qualifiers::Const) 3345 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3346 << "const" << SourceRange(D.getIdentifierLoc()); 3347 if (FTI.TypeQuals & Qualifiers::Volatile) 3348 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3349 << "volatile" << SourceRange(D.getIdentifierLoc()); 3350 if (FTI.TypeQuals & Qualifiers::Restrict) 3351 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3352 << "restrict" << SourceRange(D.getIdentifierLoc()); 3353 D.setInvalidType(); 3354 } 3355 3356 // C++0x [class.ctor]p4: 3357 // A constructor shall not be declared with a ref-qualifier. 3358 if (FTI.hasRefQualifier()) { 3359 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3360 << FTI.RefQualifierIsLValueRef 3361 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3362 D.setInvalidType(); 3363 } 3364 3365 // Rebuild the function type "R" without any type qualifiers (in 3366 // case any of the errors above fired) and with "void" as the 3367 // return type, since constructors don't have return types. 3368 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3369 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3370 return R; 3371 3372 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3373 EPI.TypeQuals = 0; 3374 EPI.RefQualifier = RQ_None; 3375 3376 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3377 Proto->getNumArgs(), EPI); 3378} 3379 3380/// CheckConstructor - Checks a fully-formed constructor for 3381/// well-formedness, issuing any diagnostics required. Returns true if 3382/// the constructor declarator is invalid. 3383void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3384 CXXRecordDecl *ClassDecl 3385 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3386 if (!ClassDecl) 3387 return Constructor->setInvalidDecl(); 3388 3389 // C++ [class.copy]p3: 3390 // A declaration of a constructor for a class X is ill-formed if 3391 // its first parameter is of type (optionally cv-qualified) X and 3392 // either there are no other parameters or else all other 3393 // parameters have default arguments. 3394 if (!Constructor->isInvalidDecl() && 3395 ((Constructor->getNumParams() == 1) || 3396 (Constructor->getNumParams() > 1 && 3397 Constructor->getParamDecl(1)->hasDefaultArg())) && 3398 Constructor->getTemplateSpecializationKind() 3399 != TSK_ImplicitInstantiation) { 3400 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3401 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3402 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3403 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3404 const char *ConstRef 3405 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3406 : " const &"; 3407 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3408 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3409 3410 // FIXME: Rather that making the constructor invalid, we should endeavor 3411 // to fix the type. 3412 Constructor->setInvalidDecl(); 3413 } 3414 } 3415} 3416 3417/// CheckDestructor - Checks a fully-formed destructor definition for 3418/// well-formedness, issuing any diagnostics required. Returns true 3419/// on error. 3420bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3421 CXXRecordDecl *RD = Destructor->getParent(); 3422 3423 if (Destructor->isVirtual()) { 3424 SourceLocation Loc; 3425 3426 if (!Destructor->isImplicit()) 3427 Loc = Destructor->getLocation(); 3428 else 3429 Loc = RD->getLocation(); 3430 3431 // If we have a virtual destructor, look up the deallocation function 3432 FunctionDecl *OperatorDelete = 0; 3433 DeclarationName Name = 3434 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3435 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3436 return true; 3437 3438 MarkDeclarationReferenced(Loc, OperatorDelete); 3439 3440 Destructor->setOperatorDelete(OperatorDelete); 3441 } 3442 3443 return false; 3444} 3445 3446static inline bool 3447FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3448 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3449 FTI.ArgInfo[0].Param && 3450 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3451} 3452 3453/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3454/// the well-formednes of the destructor declarator @p D with type @p 3455/// R. If there are any errors in the declarator, this routine will 3456/// emit diagnostics and set the declarator to invalid. Even if this happens, 3457/// will be updated to reflect a well-formed type for the destructor and 3458/// returned. 3459QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3460 StorageClass& SC) { 3461 // C++ [class.dtor]p1: 3462 // [...] A typedef-name that names a class is a class-name 3463 // (7.1.3); however, a typedef-name that names a class shall not 3464 // be used as the identifier in the declarator for a destructor 3465 // declaration. 3466 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3467 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3468 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3469 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3470 else if (const TemplateSpecializationType *TST = 3471 DeclaratorType->getAs<TemplateSpecializationType>()) 3472 if (TST->isTypeAlias()) 3473 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3474 << DeclaratorType << 1; 3475 3476 // C++ [class.dtor]p2: 3477 // A destructor is used to destroy objects of its class type. A 3478 // destructor takes no parameters, and no return type can be 3479 // specified for it (not even void). The address of a destructor 3480 // shall not be taken. A destructor shall not be static. A 3481 // destructor can be invoked for a const, volatile or const 3482 // volatile object. A destructor shall not be declared const, 3483 // volatile or const volatile (9.3.2). 3484 if (SC == SC_Static) { 3485 if (!D.isInvalidType()) 3486 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3487 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3488 << SourceRange(D.getIdentifierLoc()) 3489 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3490 3491 SC = SC_None; 3492 } 3493 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3494 // Destructors don't have return types, but the parser will 3495 // happily parse something like: 3496 // 3497 // class X { 3498 // float ~X(); 3499 // }; 3500 // 3501 // The return type will be eliminated later. 3502 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3503 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3504 << SourceRange(D.getIdentifierLoc()); 3505 } 3506 3507 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3508 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3509 if (FTI.TypeQuals & Qualifiers::Const) 3510 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3511 << "const" << SourceRange(D.getIdentifierLoc()); 3512 if (FTI.TypeQuals & Qualifiers::Volatile) 3513 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3514 << "volatile" << SourceRange(D.getIdentifierLoc()); 3515 if (FTI.TypeQuals & Qualifiers::Restrict) 3516 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3517 << "restrict" << SourceRange(D.getIdentifierLoc()); 3518 D.setInvalidType(); 3519 } 3520 3521 // C++0x [class.dtor]p2: 3522 // A destructor shall not be declared with a ref-qualifier. 3523 if (FTI.hasRefQualifier()) { 3524 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3525 << FTI.RefQualifierIsLValueRef 3526 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3527 D.setInvalidType(); 3528 } 3529 3530 // Make sure we don't have any parameters. 3531 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3532 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3533 3534 // Delete the parameters. 3535 FTI.freeArgs(); 3536 D.setInvalidType(); 3537 } 3538 3539 // Make sure the destructor isn't variadic. 3540 if (FTI.isVariadic) { 3541 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3542 D.setInvalidType(); 3543 } 3544 3545 // Rebuild the function type "R" without any type qualifiers or 3546 // parameters (in case any of the errors above fired) and with 3547 // "void" as the return type, since destructors don't have return 3548 // types. 3549 if (!D.isInvalidType()) 3550 return R; 3551 3552 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3553 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3554 EPI.Variadic = false; 3555 EPI.TypeQuals = 0; 3556 EPI.RefQualifier = RQ_None; 3557 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3558} 3559 3560/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3561/// well-formednes of the conversion function declarator @p D with 3562/// type @p R. If there are any errors in the declarator, this routine 3563/// will emit diagnostics and return true. Otherwise, it will return 3564/// false. Either way, the type @p R will be updated to reflect a 3565/// well-formed type for the conversion operator. 3566void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3567 StorageClass& SC) { 3568 // C++ [class.conv.fct]p1: 3569 // Neither parameter types nor return type can be specified. The 3570 // type of a conversion function (8.3.5) is "function taking no 3571 // parameter returning conversion-type-id." 3572 if (SC == SC_Static) { 3573 if (!D.isInvalidType()) 3574 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3575 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3576 << SourceRange(D.getIdentifierLoc()); 3577 D.setInvalidType(); 3578 SC = SC_None; 3579 } 3580 3581 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3582 3583 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3584 // Conversion functions don't have return types, but the parser will 3585 // happily parse something like: 3586 // 3587 // class X { 3588 // float operator bool(); 3589 // }; 3590 // 3591 // The return type will be changed later anyway. 3592 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3593 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3594 << SourceRange(D.getIdentifierLoc()); 3595 D.setInvalidType(); 3596 } 3597 3598 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3599 3600 // Make sure we don't have any parameters. 3601 if (Proto->getNumArgs() > 0) { 3602 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3603 3604 // Delete the parameters. 3605 D.getFunctionTypeInfo().freeArgs(); 3606 D.setInvalidType(); 3607 } else if (Proto->isVariadic()) { 3608 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3609 D.setInvalidType(); 3610 } 3611 3612 // Diagnose "&operator bool()" and other such nonsense. This 3613 // is actually a gcc extension which we don't support. 3614 if (Proto->getResultType() != ConvType) { 3615 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3616 << Proto->getResultType(); 3617 D.setInvalidType(); 3618 ConvType = Proto->getResultType(); 3619 } 3620 3621 // C++ [class.conv.fct]p4: 3622 // The conversion-type-id shall not represent a function type nor 3623 // an array type. 3624 if (ConvType->isArrayType()) { 3625 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3626 ConvType = Context.getPointerType(ConvType); 3627 D.setInvalidType(); 3628 } else if (ConvType->isFunctionType()) { 3629 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3630 ConvType = Context.getPointerType(ConvType); 3631 D.setInvalidType(); 3632 } 3633 3634 // Rebuild the function type "R" without any parameters (in case any 3635 // of the errors above fired) and with the conversion type as the 3636 // return type. 3637 if (D.isInvalidType()) 3638 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3639 3640 // C++0x explicit conversion operators. 3641 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3642 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3643 diag::warn_explicit_conversion_functions) 3644 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3645} 3646 3647/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3648/// the declaration of the given C++ conversion function. This routine 3649/// is responsible for recording the conversion function in the C++ 3650/// class, if possible. 3651Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3652 assert(Conversion && "Expected to receive a conversion function declaration"); 3653 3654 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3655 3656 // Make sure we aren't redeclaring the conversion function. 3657 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3658 3659 // C++ [class.conv.fct]p1: 3660 // [...] A conversion function is never used to convert a 3661 // (possibly cv-qualified) object to the (possibly cv-qualified) 3662 // same object type (or a reference to it), to a (possibly 3663 // cv-qualified) base class of that type (or a reference to it), 3664 // or to (possibly cv-qualified) void. 3665 // FIXME: Suppress this warning if the conversion function ends up being a 3666 // virtual function that overrides a virtual function in a base class. 3667 QualType ClassType 3668 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3669 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3670 ConvType = ConvTypeRef->getPointeeType(); 3671 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3672 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3673 /* Suppress diagnostics for instantiations. */; 3674 else if (ConvType->isRecordType()) { 3675 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3676 if (ConvType == ClassType) 3677 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3678 << ClassType; 3679 else if (IsDerivedFrom(ClassType, ConvType)) 3680 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3681 << ClassType << ConvType; 3682 } else if (ConvType->isVoidType()) { 3683 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3684 << ClassType << ConvType; 3685 } 3686 3687 if (FunctionTemplateDecl *ConversionTemplate 3688 = Conversion->getDescribedFunctionTemplate()) 3689 return ConversionTemplate; 3690 3691 return Conversion; 3692} 3693 3694//===----------------------------------------------------------------------===// 3695// Namespace Handling 3696//===----------------------------------------------------------------------===// 3697 3698 3699 3700/// ActOnStartNamespaceDef - This is called at the start of a namespace 3701/// definition. 3702Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3703 SourceLocation InlineLoc, 3704 SourceLocation NamespaceLoc, 3705 SourceLocation IdentLoc, 3706 IdentifierInfo *II, 3707 SourceLocation LBrace, 3708 AttributeList *AttrList) { 3709 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3710 // For anonymous namespace, take the location of the left brace. 3711 SourceLocation Loc = II ? IdentLoc : LBrace; 3712 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3713 StartLoc, Loc, II); 3714 Namespc->setInline(InlineLoc.isValid()); 3715 3716 Scope *DeclRegionScope = NamespcScope->getParent(); 3717 3718 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3719 3720 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3721 PushNamespaceVisibilityAttr(Attr); 3722 3723 if (II) { 3724 // C++ [namespace.def]p2: 3725 // The identifier in an original-namespace-definition shall not 3726 // have been previously defined in the declarative region in 3727 // which the original-namespace-definition appears. The 3728 // identifier in an original-namespace-definition is the name of 3729 // the namespace. Subsequently in that declarative region, it is 3730 // treated as an original-namespace-name. 3731 // 3732 // Since namespace names are unique in their scope, and we don't 3733 // look through using directives, just look for any ordinary names. 3734 3735 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 3736 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 3737 Decl::IDNS_Namespace; 3738 NamedDecl *PrevDecl = 0; 3739 for (DeclContext::lookup_result R 3740 = CurContext->getRedeclContext()->lookup(II); 3741 R.first != R.second; ++R.first) { 3742 if ((*R.first)->getIdentifierNamespace() & IDNS) { 3743 PrevDecl = *R.first; 3744 break; 3745 } 3746 } 3747 3748 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3749 // This is an extended namespace definition. 3750 if (Namespc->isInline() != OrigNS->isInline()) { 3751 // inline-ness must match 3752 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3753 << Namespc->isInline(); 3754 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3755 Namespc->setInvalidDecl(); 3756 // Recover by ignoring the new namespace's inline status. 3757 Namespc->setInline(OrigNS->isInline()); 3758 } 3759 3760 // Attach this namespace decl to the chain of extended namespace 3761 // definitions. 3762 OrigNS->setNextNamespace(Namespc); 3763 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3764 3765 // Remove the previous declaration from the scope. 3766 if (DeclRegionScope->isDeclScope(OrigNS)) { 3767 IdResolver.RemoveDecl(OrigNS); 3768 DeclRegionScope->RemoveDecl(OrigNS); 3769 } 3770 } else if (PrevDecl) { 3771 // This is an invalid name redefinition. 3772 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3773 << Namespc->getDeclName(); 3774 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3775 Namespc->setInvalidDecl(); 3776 // Continue on to push Namespc as current DeclContext and return it. 3777 } else if (II->isStr("std") && 3778 CurContext->getRedeclContext()->isTranslationUnit()) { 3779 // This is the first "real" definition of the namespace "std", so update 3780 // our cache of the "std" namespace to point at this definition. 3781 if (NamespaceDecl *StdNS = getStdNamespace()) { 3782 // We had already defined a dummy namespace "std". Link this new 3783 // namespace definition to the dummy namespace "std". 3784 StdNS->setNextNamespace(Namespc); 3785 StdNS->setLocation(IdentLoc); 3786 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3787 } 3788 3789 // Make our StdNamespace cache point at the first real definition of the 3790 // "std" namespace. 3791 StdNamespace = Namespc; 3792 } 3793 3794 PushOnScopeChains(Namespc, DeclRegionScope); 3795 } else { 3796 // Anonymous namespaces. 3797 assert(Namespc->isAnonymousNamespace()); 3798 3799 // Link the anonymous namespace into its parent. 3800 NamespaceDecl *PrevDecl; 3801 DeclContext *Parent = CurContext->getRedeclContext(); 3802 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3803 PrevDecl = TU->getAnonymousNamespace(); 3804 TU->setAnonymousNamespace(Namespc); 3805 } else { 3806 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3807 PrevDecl = ND->getAnonymousNamespace(); 3808 ND->setAnonymousNamespace(Namespc); 3809 } 3810 3811 // Link the anonymous namespace with its previous declaration. 3812 if (PrevDecl) { 3813 assert(PrevDecl->isAnonymousNamespace()); 3814 assert(!PrevDecl->getNextNamespace()); 3815 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3816 PrevDecl->setNextNamespace(Namespc); 3817 3818 if (Namespc->isInline() != PrevDecl->isInline()) { 3819 // inline-ness must match 3820 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3821 << Namespc->isInline(); 3822 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3823 Namespc->setInvalidDecl(); 3824 // Recover by ignoring the new namespace's inline status. 3825 Namespc->setInline(PrevDecl->isInline()); 3826 } 3827 } 3828 3829 CurContext->addDecl(Namespc); 3830 3831 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3832 // behaves as if it were replaced by 3833 // namespace unique { /* empty body */ } 3834 // using namespace unique; 3835 // namespace unique { namespace-body } 3836 // where all occurrences of 'unique' in a translation unit are 3837 // replaced by the same identifier and this identifier differs 3838 // from all other identifiers in the entire program. 3839 3840 // We just create the namespace with an empty name and then add an 3841 // implicit using declaration, just like the standard suggests. 3842 // 3843 // CodeGen enforces the "universally unique" aspect by giving all 3844 // declarations semantically contained within an anonymous 3845 // namespace internal linkage. 3846 3847 if (!PrevDecl) { 3848 UsingDirectiveDecl* UD 3849 = UsingDirectiveDecl::Create(Context, CurContext, 3850 /* 'using' */ LBrace, 3851 /* 'namespace' */ SourceLocation(), 3852 /* qualifier */ NestedNameSpecifierLoc(), 3853 /* identifier */ SourceLocation(), 3854 Namespc, 3855 /* Ancestor */ CurContext); 3856 UD->setImplicit(); 3857 CurContext->addDecl(UD); 3858 } 3859 } 3860 3861 // Although we could have an invalid decl (i.e. the namespace name is a 3862 // redefinition), push it as current DeclContext and try to continue parsing. 3863 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3864 // for the namespace has the declarations that showed up in that particular 3865 // namespace definition. 3866 PushDeclContext(NamespcScope, Namespc); 3867 return Namespc; 3868} 3869 3870/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3871/// is a namespace alias, returns the namespace it points to. 3872static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3873 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3874 return AD->getNamespace(); 3875 return dyn_cast_or_null<NamespaceDecl>(D); 3876} 3877 3878/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3879/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3880void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3881 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3882 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3883 Namespc->setRBraceLoc(RBrace); 3884 PopDeclContext(); 3885 if (Namespc->hasAttr<VisibilityAttr>()) 3886 PopPragmaVisibility(); 3887} 3888 3889CXXRecordDecl *Sema::getStdBadAlloc() const { 3890 return cast_or_null<CXXRecordDecl>( 3891 StdBadAlloc.get(Context.getExternalSource())); 3892} 3893 3894NamespaceDecl *Sema::getStdNamespace() const { 3895 return cast_or_null<NamespaceDecl>( 3896 StdNamespace.get(Context.getExternalSource())); 3897} 3898 3899/// \brief Retrieve the special "std" namespace, which may require us to 3900/// implicitly define the namespace. 3901NamespaceDecl *Sema::getOrCreateStdNamespace() { 3902 if (!StdNamespace) { 3903 // The "std" namespace has not yet been defined, so build one implicitly. 3904 StdNamespace = NamespaceDecl::Create(Context, 3905 Context.getTranslationUnitDecl(), 3906 SourceLocation(), SourceLocation(), 3907 &PP.getIdentifierTable().get("std")); 3908 getStdNamespace()->setImplicit(true); 3909 } 3910 3911 return getStdNamespace(); 3912} 3913 3914/// \brief Determine whether a using statement is in a context where it will be 3915/// apply in all contexts. 3916static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3917 switch (CurContext->getDeclKind()) { 3918 case Decl::TranslationUnit: 3919 return true; 3920 case Decl::LinkageSpec: 3921 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3922 default: 3923 return false; 3924 } 3925} 3926 3927Decl *Sema::ActOnUsingDirective(Scope *S, 3928 SourceLocation UsingLoc, 3929 SourceLocation NamespcLoc, 3930 CXXScopeSpec &SS, 3931 SourceLocation IdentLoc, 3932 IdentifierInfo *NamespcName, 3933 AttributeList *AttrList) { 3934 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3935 assert(NamespcName && "Invalid NamespcName."); 3936 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3937 3938 // This can only happen along a recovery path. 3939 while (S->getFlags() & Scope::TemplateParamScope) 3940 S = S->getParent(); 3941 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3942 3943 UsingDirectiveDecl *UDir = 0; 3944 NestedNameSpecifier *Qualifier = 0; 3945 if (SS.isSet()) 3946 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3947 3948 // Lookup namespace name. 3949 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3950 LookupParsedName(R, S, &SS); 3951 if (R.isAmbiguous()) 3952 return 0; 3953 3954 if (R.empty()) { 3955 // Allow "using namespace std;" or "using namespace ::std;" even if 3956 // "std" hasn't been defined yet, for GCC compatibility. 3957 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3958 NamespcName->isStr("std")) { 3959 Diag(IdentLoc, diag::ext_using_undefined_std); 3960 R.addDecl(getOrCreateStdNamespace()); 3961 R.resolveKind(); 3962 } 3963 // Otherwise, attempt typo correction. 3964 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3965 CTC_NoKeywords, 0)) { 3966 if (R.getAsSingle<NamespaceDecl>() || 3967 R.getAsSingle<NamespaceAliasDecl>()) { 3968 if (DeclContext *DC = computeDeclContext(SS, false)) 3969 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3970 << NamespcName << DC << Corrected << SS.getRange() 3971 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3972 else 3973 Diag(IdentLoc, diag::err_using_directive_suggest) 3974 << NamespcName << Corrected 3975 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3976 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3977 << Corrected; 3978 3979 NamespcName = Corrected.getAsIdentifierInfo(); 3980 } else { 3981 R.clear(); 3982 R.setLookupName(NamespcName); 3983 } 3984 } 3985 } 3986 3987 if (!R.empty()) { 3988 NamedDecl *Named = R.getFoundDecl(); 3989 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3990 && "expected namespace decl"); 3991 // C++ [namespace.udir]p1: 3992 // A using-directive specifies that the names in the nominated 3993 // namespace can be used in the scope in which the 3994 // using-directive appears after the using-directive. During 3995 // unqualified name lookup (3.4.1), the names appear as if they 3996 // were declared in the nearest enclosing namespace which 3997 // contains both the using-directive and the nominated 3998 // namespace. [Note: in this context, "contains" means "contains 3999 // directly or indirectly". ] 4000 4001 // Find enclosing context containing both using-directive and 4002 // nominated namespace. 4003 NamespaceDecl *NS = getNamespaceDecl(Named); 4004 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4005 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4006 CommonAncestor = CommonAncestor->getParent(); 4007 4008 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4009 SS.getWithLocInContext(Context), 4010 IdentLoc, Named, CommonAncestor); 4011 4012 if (IsUsingDirectiveInToplevelContext(CurContext) && 4013 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4014 Diag(IdentLoc, diag::warn_using_directive_in_header); 4015 } 4016 4017 PushUsingDirective(S, UDir); 4018 } else { 4019 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4020 } 4021 4022 // FIXME: We ignore attributes for now. 4023 return UDir; 4024} 4025 4026void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4027 // If scope has associated entity, then using directive is at namespace 4028 // or translation unit scope. We add UsingDirectiveDecls, into 4029 // it's lookup structure. 4030 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4031 Ctx->addDecl(UDir); 4032 else 4033 // Otherwise it is block-sope. using-directives will affect lookup 4034 // only to the end of scope. 4035 S->PushUsingDirective(UDir); 4036} 4037 4038 4039Decl *Sema::ActOnUsingDeclaration(Scope *S, 4040 AccessSpecifier AS, 4041 bool HasUsingKeyword, 4042 SourceLocation UsingLoc, 4043 CXXScopeSpec &SS, 4044 UnqualifiedId &Name, 4045 AttributeList *AttrList, 4046 bool IsTypeName, 4047 SourceLocation TypenameLoc) { 4048 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4049 4050 switch (Name.getKind()) { 4051 case UnqualifiedId::IK_Identifier: 4052 case UnqualifiedId::IK_OperatorFunctionId: 4053 case UnqualifiedId::IK_LiteralOperatorId: 4054 case UnqualifiedId::IK_ConversionFunctionId: 4055 break; 4056 4057 case UnqualifiedId::IK_ConstructorName: 4058 case UnqualifiedId::IK_ConstructorTemplateId: 4059 // C++0x inherited constructors. 4060 if (getLangOptions().CPlusPlus0x) break; 4061 4062 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4063 << SS.getRange(); 4064 return 0; 4065 4066 case UnqualifiedId::IK_DestructorName: 4067 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4068 << SS.getRange(); 4069 return 0; 4070 4071 case UnqualifiedId::IK_TemplateId: 4072 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4073 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4074 return 0; 4075 } 4076 4077 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4078 DeclarationName TargetName = TargetNameInfo.getName(); 4079 if (!TargetName) 4080 return 0; 4081 4082 // Warn about using declarations. 4083 // TODO: store that the declaration was written without 'using' and 4084 // talk about access decls instead of using decls in the 4085 // diagnostics. 4086 if (!HasUsingKeyword) { 4087 UsingLoc = Name.getSourceRange().getBegin(); 4088 4089 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4090 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4091 } 4092 4093 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4094 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4095 return 0; 4096 4097 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4098 TargetNameInfo, AttrList, 4099 /* IsInstantiation */ false, 4100 IsTypeName, TypenameLoc); 4101 if (UD) 4102 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4103 4104 return UD; 4105} 4106 4107/// \brief Determine whether a using declaration considers the given 4108/// declarations as "equivalent", e.g., if they are redeclarations of 4109/// the same entity or are both typedefs of the same type. 4110static bool 4111IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4112 bool &SuppressRedeclaration) { 4113 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4114 SuppressRedeclaration = false; 4115 return true; 4116 } 4117 4118 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4119 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4120 SuppressRedeclaration = true; 4121 return Context.hasSameType(TD1->getUnderlyingType(), 4122 TD2->getUnderlyingType()); 4123 } 4124 4125 return false; 4126} 4127 4128 4129/// Determines whether to create a using shadow decl for a particular 4130/// decl, given the set of decls existing prior to this using lookup. 4131bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4132 const LookupResult &Previous) { 4133 // Diagnose finding a decl which is not from a base class of the 4134 // current class. We do this now because there are cases where this 4135 // function will silently decide not to build a shadow decl, which 4136 // will pre-empt further diagnostics. 4137 // 4138 // We don't need to do this in C++0x because we do the check once on 4139 // the qualifier. 4140 // 4141 // FIXME: diagnose the following if we care enough: 4142 // struct A { int foo; }; 4143 // struct B : A { using A::foo; }; 4144 // template <class T> struct C : A {}; 4145 // template <class T> struct D : C<T> { using B::foo; } // <--- 4146 // This is invalid (during instantiation) in C++03 because B::foo 4147 // resolves to the using decl in B, which is not a base class of D<T>. 4148 // We can't diagnose it immediately because C<T> is an unknown 4149 // specialization. The UsingShadowDecl in D<T> then points directly 4150 // to A::foo, which will look well-formed when we instantiate. 4151 // The right solution is to not collapse the shadow-decl chain. 4152 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4153 DeclContext *OrigDC = Orig->getDeclContext(); 4154 4155 // Handle enums and anonymous structs. 4156 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4157 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4158 while (OrigRec->isAnonymousStructOrUnion()) 4159 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4160 4161 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4162 if (OrigDC == CurContext) { 4163 Diag(Using->getLocation(), 4164 diag::err_using_decl_nested_name_specifier_is_current_class) 4165 << Using->getQualifierLoc().getSourceRange(); 4166 Diag(Orig->getLocation(), diag::note_using_decl_target); 4167 return true; 4168 } 4169 4170 Diag(Using->getQualifierLoc().getBeginLoc(), 4171 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4172 << Using->getQualifier() 4173 << cast<CXXRecordDecl>(CurContext) 4174 << Using->getQualifierLoc().getSourceRange(); 4175 Diag(Orig->getLocation(), diag::note_using_decl_target); 4176 return true; 4177 } 4178 } 4179 4180 if (Previous.empty()) return false; 4181 4182 NamedDecl *Target = Orig; 4183 if (isa<UsingShadowDecl>(Target)) 4184 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4185 4186 // If the target happens to be one of the previous declarations, we 4187 // don't have a conflict. 4188 // 4189 // FIXME: but we might be increasing its access, in which case we 4190 // should redeclare it. 4191 NamedDecl *NonTag = 0, *Tag = 0; 4192 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4193 I != E; ++I) { 4194 NamedDecl *D = (*I)->getUnderlyingDecl(); 4195 bool Result; 4196 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4197 return Result; 4198 4199 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4200 } 4201 4202 if (Target->isFunctionOrFunctionTemplate()) { 4203 FunctionDecl *FD; 4204 if (isa<FunctionTemplateDecl>(Target)) 4205 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4206 else 4207 FD = cast<FunctionDecl>(Target); 4208 4209 NamedDecl *OldDecl = 0; 4210 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4211 case Ovl_Overload: 4212 return false; 4213 4214 case Ovl_NonFunction: 4215 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4216 break; 4217 4218 // We found a decl with the exact signature. 4219 case Ovl_Match: 4220 // If we're in a record, we want to hide the target, so we 4221 // return true (without a diagnostic) to tell the caller not to 4222 // build a shadow decl. 4223 if (CurContext->isRecord()) 4224 return true; 4225 4226 // If we're not in a record, this is an error. 4227 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4228 break; 4229 } 4230 4231 Diag(Target->getLocation(), diag::note_using_decl_target); 4232 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4233 return true; 4234 } 4235 4236 // Target is not a function. 4237 4238 if (isa<TagDecl>(Target)) { 4239 // No conflict between a tag and a non-tag. 4240 if (!Tag) return false; 4241 4242 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4243 Diag(Target->getLocation(), diag::note_using_decl_target); 4244 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4245 return true; 4246 } 4247 4248 // No conflict between a tag and a non-tag. 4249 if (!NonTag) return false; 4250 4251 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4252 Diag(Target->getLocation(), diag::note_using_decl_target); 4253 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4254 return true; 4255} 4256 4257/// Builds a shadow declaration corresponding to a 'using' declaration. 4258UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4259 UsingDecl *UD, 4260 NamedDecl *Orig) { 4261 4262 // If we resolved to another shadow declaration, just coalesce them. 4263 NamedDecl *Target = Orig; 4264 if (isa<UsingShadowDecl>(Target)) { 4265 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4266 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4267 } 4268 4269 UsingShadowDecl *Shadow 4270 = UsingShadowDecl::Create(Context, CurContext, 4271 UD->getLocation(), UD, Target); 4272 UD->addShadowDecl(Shadow); 4273 4274 Shadow->setAccess(UD->getAccess()); 4275 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4276 Shadow->setInvalidDecl(); 4277 4278 if (S) 4279 PushOnScopeChains(Shadow, S); 4280 else 4281 CurContext->addDecl(Shadow); 4282 4283 4284 return Shadow; 4285} 4286 4287/// Hides a using shadow declaration. This is required by the current 4288/// using-decl implementation when a resolvable using declaration in a 4289/// class is followed by a declaration which would hide or override 4290/// one or more of the using decl's targets; for example: 4291/// 4292/// struct Base { void foo(int); }; 4293/// struct Derived : Base { 4294/// using Base::foo; 4295/// void foo(int); 4296/// }; 4297/// 4298/// The governing language is C++03 [namespace.udecl]p12: 4299/// 4300/// When a using-declaration brings names from a base class into a 4301/// derived class scope, member functions in the derived class 4302/// override and/or hide member functions with the same name and 4303/// parameter types in a base class (rather than conflicting). 4304/// 4305/// There are two ways to implement this: 4306/// (1) optimistically create shadow decls when they're not hidden 4307/// by existing declarations, or 4308/// (2) don't create any shadow decls (or at least don't make them 4309/// visible) until we've fully parsed/instantiated the class. 4310/// The problem with (1) is that we might have to retroactively remove 4311/// a shadow decl, which requires several O(n) operations because the 4312/// decl structures are (very reasonably) not designed for removal. 4313/// (2) avoids this but is very fiddly and phase-dependent. 4314void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4315 if (Shadow->getDeclName().getNameKind() == 4316 DeclarationName::CXXConversionFunctionName) 4317 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4318 4319 // Remove it from the DeclContext... 4320 Shadow->getDeclContext()->removeDecl(Shadow); 4321 4322 // ...and the scope, if applicable... 4323 if (S) { 4324 S->RemoveDecl(Shadow); 4325 IdResolver.RemoveDecl(Shadow); 4326 } 4327 4328 // ...and the using decl. 4329 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4330 4331 // TODO: complain somehow if Shadow was used. It shouldn't 4332 // be possible for this to happen, because...? 4333} 4334 4335/// Builds a using declaration. 4336/// 4337/// \param IsInstantiation - Whether this call arises from an 4338/// instantiation of an unresolved using declaration. We treat 4339/// the lookup differently for these declarations. 4340NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4341 SourceLocation UsingLoc, 4342 CXXScopeSpec &SS, 4343 const DeclarationNameInfo &NameInfo, 4344 AttributeList *AttrList, 4345 bool IsInstantiation, 4346 bool IsTypeName, 4347 SourceLocation TypenameLoc) { 4348 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4349 SourceLocation IdentLoc = NameInfo.getLoc(); 4350 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4351 4352 // FIXME: We ignore attributes for now. 4353 4354 if (SS.isEmpty()) { 4355 Diag(IdentLoc, diag::err_using_requires_qualname); 4356 return 0; 4357 } 4358 4359 // Do the redeclaration lookup in the current scope. 4360 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4361 ForRedeclaration); 4362 Previous.setHideTags(false); 4363 if (S) { 4364 LookupName(Previous, S); 4365 4366 // It is really dumb that we have to do this. 4367 LookupResult::Filter F = Previous.makeFilter(); 4368 while (F.hasNext()) { 4369 NamedDecl *D = F.next(); 4370 if (!isDeclInScope(D, CurContext, S)) 4371 F.erase(); 4372 } 4373 F.done(); 4374 } else { 4375 assert(IsInstantiation && "no scope in non-instantiation"); 4376 assert(CurContext->isRecord() && "scope not record in instantiation"); 4377 LookupQualifiedName(Previous, CurContext); 4378 } 4379 4380 // Check for invalid redeclarations. 4381 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4382 return 0; 4383 4384 // Check for bad qualifiers. 4385 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4386 return 0; 4387 4388 DeclContext *LookupContext = computeDeclContext(SS); 4389 NamedDecl *D; 4390 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4391 if (!LookupContext) { 4392 if (IsTypeName) { 4393 // FIXME: not all declaration name kinds are legal here 4394 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4395 UsingLoc, TypenameLoc, 4396 QualifierLoc, 4397 IdentLoc, NameInfo.getName()); 4398 } else { 4399 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4400 QualifierLoc, NameInfo); 4401 } 4402 } else { 4403 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4404 NameInfo, IsTypeName); 4405 } 4406 D->setAccess(AS); 4407 CurContext->addDecl(D); 4408 4409 if (!LookupContext) return D; 4410 UsingDecl *UD = cast<UsingDecl>(D); 4411 4412 if (RequireCompleteDeclContext(SS, LookupContext)) { 4413 UD->setInvalidDecl(); 4414 return UD; 4415 } 4416 4417 // Constructor inheriting using decls get special treatment. 4418 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4419 if (CheckInheritedConstructorUsingDecl(UD)) 4420 UD->setInvalidDecl(); 4421 return UD; 4422 } 4423 4424 // Otherwise, look up the target name. 4425 4426 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4427 4428 // Unlike most lookups, we don't always want to hide tag 4429 // declarations: tag names are visible through the using declaration 4430 // even if hidden by ordinary names, *except* in a dependent context 4431 // where it's important for the sanity of two-phase lookup. 4432 if (!IsInstantiation) 4433 R.setHideTags(false); 4434 4435 LookupQualifiedName(R, LookupContext); 4436 4437 if (R.empty()) { 4438 Diag(IdentLoc, diag::err_no_member) 4439 << NameInfo.getName() << LookupContext << SS.getRange(); 4440 UD->setInvalidDecl(); 4441 return UD; 4442 } 4443 4444 if (R.isAmbiguous()) { 4445 UD->setInvalidDecl(); 4446 return UD; 4447 } 4448 4449 if (IsTypeName) { 4450 // If we asked for a typename and got a non-type decl, error out. 4451 if (!R.getAsSingle<TypeDecl>()) { 4452 Diag(IdentLoc, diag::err_using_typename_non_type); 4453 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4454 Diag((*I)->getUnderlyingDecl()->getLocation(), 4455 diag::note_using_decl_target); 4456 UD->setInvalidDecl(); 4457 return UD; 4458 } 4459 } else { 4460 // If we asked for a non-typename and we got a type, error out, 4461 // but only if this is an instantiation of an unresolved using 4462 // decl. Otherwise just silently find the type name. 4463 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4464 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4465 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4466 UD->setInvalidDecl(); 4467 return UD; 4468 } 4469 } 4470 4471 // C++0x N2914 [namespace.udecl]p6: 4472 // A using-declaration shall not name a namespace. 4473 if (R.getAsSingle<NamespaceDecl>()) { 4474 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4475 << SS.getRange(); 4476 UD->setInvalidDecl(); 4477 return UD; 4478 } 4479 4480 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4481 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4482 BuildUsingShadowDecl(S, UD, *I); 4483 } 4484 4485 return UD; 4486} 4487 4488/// Additional checks for a using declaration referring to a constructor name. 4489bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4490 if (UD->isTypeName()) { 4491 // FIXME: Cannot specify typename when specifying constructor 4492 return true; 4493 } 4494 4495 const Type *SourceType = UD->getQualifier()->getAsType(); 4496 assert(SourceType && 4497 "Using decl naming constructor doesn't have type in scope spec."); 4498 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4499 4500 // Check whether the named type is a direct base class. 4501 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4502 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4503 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4504 BaseIt != BaseE; ++BaseIt) { 4505 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4506 if (CanonicalSourceType == BaseType) 4507 break; 4508 } 4509 4510 if (BaseIt == BaseE) { 4511 // Did not find SourceType in the bases. 4512 Diag(UD->getUsingLocation(), 4513 diag::err_using_decl_constructor_not_in_direct_base) 4514 << UD->getNameInfo().getSourceRange() 4515 << QualType(SourceType, 0) << TargetClass; 4516 return true; 4517 } 4518 4519 BaseIt->setInheritConstructors(); 4520 4521 return false; 4522} 4523 4524/// Checks that the given using declaration is not an invalid 4525/// redeclaration. Note that this is checking only for the using decl 4526/// itself, not for any ill-formedness among the UsingShadowDecls. 4527bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4528 bool isTypeName, 4529 const CXXScopeSpec &SS, 4530 SourceLocation NameLoc, 4531 const LookupResult &Prev) { 4532 // C++03 [namespace.udecl]p8: 4533 // C++0x [namespace.udecl]p10: 4534 // A using-declaration is a declaration and can therefore be used 4535 // repeatedly where (and only where) multiple declarations are 4536 // allowed. 4537 // 4538 // That's in non-member contexts. 4539 if (!CurContext->getRedeclContext()->isRecord()) 4540 return false; 4541 4542 NestedNameSpecifier *Qual 4543 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4544 4545 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4546 NamedDecl *D = *I; 4547 4548 bool DTypename; 4549 NestedNameSpecifier *DQual; 4550 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4551 DTypename = UD->isTypeName(); 4552 DQual = UD->getQualifier(); 4553 } else if (UnresolvedUsingValueDecl *UD 4554 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4555 DTypename = false; 4556 DQual = UD->getQualifier(); 4557 } else if (UnresolvedUsingTypenameDecl *UD 4558 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4559 DTypename = true; 4560 DQual = UD->getQualifier(); 4561 } else continue; 4562 4563 // using decls differ if one says 'typename' and the other doesn't. 4564 // FIXME: non-dependent using decls? 4565 if (isTypeName != DTypename) continue; 4566 4567 // using decls differ if they name different scopes (but note that 4568 // template instantiation can cause this check to trigger when it 4569 // didn't before instantiation). 4570 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4571 Context.getCanonicalNestedNameSpecifier(DQual)) 4572 continue; 4573 4574 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4575 Diag(D->getLocation(), diag::note_using_decl) << 1; 4576 return true; 4577 } 4578 4579 return false; 4580} 4581 4582 4583/// Checks that the given nested-name qualifier used in a using decl 4584/// in the current context is appropriately related to the current 4585/// scope. If an error is found, diagnoses it and returns true. 4586bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4587 const CXXScopeSpec &SS, 4588 SourceLocation NameLoc) { 4589 DeclContext *NamedContext = computeDeclContext(SS); 4590 4591 if (!CurContext->isRecord()) { 4592 // C++03 [namespace.udecl]p3: 4593 // C++0x [namespace.udecl]p8: 4594 // A using-declaration for a class member shall be a member-declaration. 4595 4596 // If we weren't able to compute a valid scope, it must be a 4597 // dependent class scope. 4598 if (!NamedContext || NamedContext->isRecord()) { 4599 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4600 << SS.getRange(); 4601 return true; 4602 } 4603 4604 // Otherwise, everything is known to be fine. 4605 return false; 4606 } 4607 4608 // The current scope is a record. 4609 4610 // If the named context is dependent, we can't decide much. 4611 if (!NamedContext) { 4612 // FIXME: in C++0x, we can diagnose if we can prove that the 4613 // nested-name-specifier does not refer to a base class, which is 4614 // still possible in some cases. 4615 4616 // Otherwise we have to conservatively report that things might be 4617 // okay. 4618 return false; 4619 } 4620 4621 if (!NamedContext->isRecord()) { 4622 // Ideally this would point at the last name in the specifier, 4623 // but we don't have that level of source info. 4624 Diag(SS.getRange().getBegin(), 4625 diag::err_using_decl_nested_name_specifier_is_not_class) 4626 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4627 return true; 4628 } 4629 4630 if (!NamedContext->isDependentContext() && 4631 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4632 return true; 4633 4634 if (getLangOptions().CPlusPlus0x) { 4635 // C++0x [namespace.udecl]p3: 4636 // In a using-declaration used as a member-declaration, the 4637 // nested-name-specifier shall name a base class of the class 4638 // being defined. 4639 4640 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4641 cast<CXXRecordDecl>(NamedContext))) { 4642 if (CurContext == NamedContext) { 4643 Diag(NameLoc, 4644 diag::err_using_decl_nested_name_specifier_is_current_class) 4645 << SS.getRange(); 4646 return true; 4647 } 4648 4649 Diag(SS.getRange().getBegin(), 4650 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4651 << (NestedNameSpecifier*) SS.getScopeRep() 4652 << cast<CXXRecordDecl>(CurContext) 4653 << SS.getRange(); 4654 return true; 4655 } 4656 4657 return false; 4658 } 4659 4660 // C++03 [namespace.udecl]p4: 4661 // A using-declaration used as a member-declaration shall refer 4662 // to a member of a base class of the class being defined [etc.]. 4663 4664 // Salient point: SS doesn't have to name a base class as long as 4665 // lookup only finds members from base classes. Therefore we can 4666 // diagnose here only if we can prove that that can't happen, 4667 // i.e. if the class hierarchies provably don't intersect. 4668 4669 // TODO: it would be nice if "definitely valid" results were cached 4670 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4671 // need to be repeated. 4672 4673 struct UserData { 4674 llvm::DenseSet<const CXXRecordDecl*> Bases; 4675 4676 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4677 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4678 Data->Bases.insert(Base); 4679 return true; 4680 } 4681 4682 bool hasDependentBases(const CXXRecordDecl *Class) { 4683 return !Class->forallBases(collect, this); 4684 } 4685 4686 /// Returns true if the base is dependent or is one of the 4687 /// accumulated base classes. 4688 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4689 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4690 return !Data->Bases.count(Base); 4691 } 4692 4693 bool mightShareBases(const CXXRecordDecl *Class) { 4694 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4695 } 4696 }; 4697 4698 UserData Data; 4699 4700 // Returns false if we find a dependent base. 4701 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4702 return false; 4703 4704 // Returns false if the class has a dependent base or if it or one 4705 // of its bases is present in the base set of the current context. 4706 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4707 return false; 4708 4709 Diag(SS.getRange().getBegin(), 4710 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4711 << (NestedNameSpecifier*) SS.getScopeRep() 4712 << cast<CXXRecordDecl>(CurContext) 4713 << SS.getRange(); 4714 4715 return true; 4716} 4717 4718Decl *Sema::ActOnAliasDeclaration(Scope *S, 4719 AccessSpecifier AS, 4720 MultiTemplateParamsArg TemplateParamLists, 4721 SourceLocation UsingLoc, 4722 UnqualifiedId &Name, 4723 TypeResult Type) { 4724 // Skip up to the relevant declaration scope. 4725 while (S->getFlags() & Scope::TemplateParamScope) 4726 S = S->getParent(); 4727 assert((S->getFlags() & Scope::DeclScope) && 4728 "got alias-declaration outside of declaration scope"); 4729 4730 if (Type.isInvalid()) 4731 return 0; 4732 4733 bool Invalid = false; 4734 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4735 TypeSourceInfo *TInfo = 0; 4736 GetTypeFromParser(Type.get(), &TInfo); 4737 4738 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4739 return 0; 4740 4741 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4742 UPPC_DeclarationType)) { 4743 Invalid = true; 4744 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 4745 TInfo->getTypeLoc().getBeginLoc()); 4746 } 4747 4748 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4749 LookupName(Previous, S); 4750 4751 // Warn about shadowing the name of a template parameter. 4752 if (Previous.isSingleResult() && 4753 Previous.getFoundDecl()->isTemplateParameter()) { 4754 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4755 Previous.getFoundDecl())) 4756 Invalid = true; 4757 Previous.clear(); 4758 } 4759 4760 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4761 "name in alias declaration must be an identifier"); 4762 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4763 Name.StartLocation, 4764 Name.Identifier, TInfo); 4765 4766 NewTD->setAccess(AS); 4767 4768 if (Invalid) 4769 NewTD->setInvalidDecl(); 4770 4771 CheckTypedefForVariablyModifiedType(S, NewTD); 4772 Invalid |= NewTD->isInvalidDecl(); 4773 4774 bool Redeclaration = false; 4775 4776 NamedDecl *NewND; 4777 if (TemplateParamLists.size()) { 4778 TypeAliasTemplateDecl *OldDecl = 0; 4779 TemplateParameterList *OldTemplateParams = 0; 4780 4781 if (TemplateParamLists.size() != 1) { 4782 Diag(UsingLoc, diag::err_alias_template_extra_headers) 4783 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 4784 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 4785 } 4786 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 4787 4788 // Only consider previous declarations in the same scope. 4789 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 4790 /*ExplicitInstantiationOrSpecialization*/false); 4791 if (!Previous.empty()) { 4792 Redeclaration = true; 4793 4794 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 4795 if (!OldDecl && !Invalid) { 4796 Diag(UsingLoc, diag::err_redefinition_different_kind) 4797 << Name.Identifier; 4798 4799 NamedDecl *OldD = Previous.getRepresentativeDecl(); 4800 if (OldD->getLocation().isValid()) 4801 Diag(OldD->getLocation(), diag::note_previous_definition); 4802 4803 Invalid = true; 4804 } 4805 4806 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 4807 if (TemplateParameterListsAreEqual(TemplateParams, 4808 OldDecl->getTemplateParameters(), 4809 /*Complain=*/true, 4810 TPL_TemplateMatch)) 4811 OldTemplateParams = OldDecl->getTemplateParameters(); 4812 else 4813 Invalid = true; 4814 4815 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 4816 if (!Invalid && 4817 !Context.hasSameType(OldTD->getUnderlyingType(), 4818 NewTD->getUnderlyingType())) { 4819 // FIXME: The C++0x standard does not clearly say this is ill-formed, 4820 // but we can't reasonably accept it. 4821 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 4822 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 4823 if (OldTD->getLocation().isValid()) 4824 Diag(OldTD->getLocation(), diag::note_previous_definition); 4825 Invalid = true; 4826 } 4827 } 4828 } 4829 4830 // Merge any previous default template arguments into our parameters, 4831 // and check the parameter list. 4832 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 4833 TPC_TypeAliasTemplate)) 4834 return 0; 4835 4836 TypeAliasTemplateDecl *NewDecl = 4837 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 4838 Name.Identifier, TemplateParams, 4839 NewTD); 4840 4841 NewDecl->setAccess(AS); 4842 4843 if (Invalid) 4844 NewDecl->setInvalidDecl(); 4845 else if (OldDecl) 4846 NewDecl->setPreviousDeclaration(OldDecl); 4847 4848 NewND = NewDecl; 4849 } else { 4850 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4851 NewND = NewTD; 4852 } 4853 4854 if (!Redeclaration) 4855 PushOnScopeChains(NewND, S); 4856 4857 return NewND; 4858} 4859 4860Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4861 SourceLocation NamespaceLoc, 4862 SourceLocation AliasLoc, 4863 IdentifierInfo *Alias, 4864 CXXScopeSpec &SS, 4865 SourceLocation IdentLoc, 4866 IdentifierInfo *Ident) { 4867 4868 // Lookup the namespace name. 4869 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4870 LookupParsedName(R, S, &SS); 4871 4872 // Check if we have a previous declaration with the same name. 4873 NamedDecl *PrevDecl 4874 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4875 ForRedeclaration); 4876 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4877 PrevDecl = 0; 4878 4879 if (PrevDecl) { 4880 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4881 // We already have an alias with the same name that points to the same 4882 // namespace, so don't create a new one. 4883 // FIXME: At some point, we'll want to create the (redundant) 4884 // declaration to maintain better source information. 4885 if (!R.isAmbiguous() && !R.empty() && 4886 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4887 return 0; 4888 } 4889 4890 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4891 diag::err_redefinition_different_kind; 4892 Diag(AliasLoc, DiagID) << Alias; 4893 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4894 return 0; 4895 } 4896 4897 if (R.isAmbiguous()) 4898 return 0; 4899 4900 if (R.empty()) { 4901 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4902 CTC_NoKeywords, 0)) { 4903 if (R.getAsSingle<NamespaceDecl>() || 4904 R.getAsSingle<NamespaceAliasDecl>()) { 4905 if (DeclContext *DC = computeDeclContext(SS, false)) 4906 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4907 << Ident << DC << Corrected << SS.getRange() 4908 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4909 else 4910 Diag(IdentLoc, diag::err_using_directive_suggest) 4911 << Ident << Corrected 4912 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4913 4914 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4915 << Corrected; 4916 4917 Ident = Corrected.getAsIdentifierInfo(); 4918 } else { 4919 R.clear(); 4920 R.setLookupName(Ident); 4921 } 4922 } 4923 4924 if (R.empty()) { 4925 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4926 return 0; 4927 } 4928 } 4929 4930 NamespaceAliasDecl *AliasDecl = 4931 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4932 Alias, SS.getWithLocInContext(Context), 4933 IdentLoc, R.getFoundDecl()); 4934 4935 PushOnScopeChains(AliasDecl, S); 4936 return AliasDecl; 4937} 4938 4939namespace { 4940 /// \brief Scoped object used to handle the state changes required in Sema 4941 /// to implicitly define the body of a C++ member function; 4942 class ImplicitlyDefinedFunctionScope { 4943 Sema &S; 4944 Sema::ContextRAII SavedContext; 4945 4946 public: 4947 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4948 : S(S), SavedContext(S, Method) 4949 { 4950 S.PushFunctionScope(); 4951 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4952 } 4953 4954 ~ImplicitlyDefinedFunctionScope() { 4955 S.PopExpressionEvaluationContext(); 4956 S.PopFunctionOrBlockScope(); 4957 } 4958 }; 4959} 4960 4961static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4962 CXXRecordDecl *D) { 4963 ASTContext &Context = Self.Context; 4964 QualType ClassType = Context.getTypeDeclType(D); 4965 DeclarationName ConstructorName 4966 = Context.DeclarationNames.getCXXConstructorName( 4967 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4968 4969 DeclContext::lookup_const_iterator Con, ConEnd; 4970 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4971 Con != ConEnd; ++Con) { 4972 // FIXME: In C++0x, a constructor template can be a default constructor. 4973 if (isa<FunctionTemplateDecl>(*Con)) 4974 continue; 4975 4976 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4977 if (Constructor->isDefaultConstructor()) 4978 return Constructor; 4979 } 4980 return 0; 4981} 4982 4983CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4984 CXXRecordDecl *ClassDecl) { 4985 // C++ [class.ctor]p5: 4986 // A default constructor for a class X is a constructor of class X 4987 // that can be called without an argument. If there is no 4988 // user-declared constructor for class X, a default constructor is 4989 // implicitly declared. An implicitly-declared default constructor 4990 // is an inline public member of its class. 4991 assert(!ClassDecl->hasUserDeclaredConstructor() && 4992 "Should not build implicit default constructor!"); 4993 4994 // C++ [except.spec]p14: 4995 // An implicitly declared special member function (Clause 12) shall have an 4996 // exception-specification. [...] 4997 ImplicitExceptionSpecification ExceptSpec(Context); 4998 4999 // Direct base-class constructors. 5000 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5001 BEnd = ClassDecl->bases_end(); 5002 B != BEnd; ++B) { 5003 if (B->isVirtual()) // Handled below. 5004 continue; 5005 5006 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5007 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5008 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 5009 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5010 else if (CXXConstructorDecl *Constructor 5011 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5012 ExceptSpec.CalledDecl(Constructor); 5013 } 5014 } 5015 5016 // Virtual base-class constructors. 5017 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5018 BEnd = ClassDecl->vbases_end(); 5019 B != BEnd; ++B) { 5020 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5021 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5022 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 5023 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5024 else if (CXXConstructorDecl *Constructor 5025 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5026 ExceptSpec.CalledDecl(Constructor); 5027 } 5028 } 5029 5030 // Field constructors. 5031 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5032 FEnd = ClassDecl->field_end(); 5033 F != FEnd; ++F) { 5034 if (const RecordType *RecordTy 5035 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5036 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5037 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 5038 ExceptSpec.CalledDecl( 5039 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5040 else if (CXXConstructorDecl *Constructor 5041 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5042 ExceptSpec.CalledDecl(Constructor); 5043 } 5044 } 5045 5046 FunctionProtoType::ExtProtoInfo EPI; 5047 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5048 EPI.NumExceptions = ExceptSpec.size(); 5049 EPI.Exceptions = ExceptSpec.data(); 5050 5051 // Create the actual constructor declaration. 5052 CanQualType ClassType 5053 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5054 SourceLocation ClassLoc = ClassDecl->getLocation(); 5055 DeclarationName Name 5056 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5057 DeclarationNameInfo NameInfo(Name, ClassLoc); 5058 CXXConstructorDecl *DefaultCon 5059 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5060 Context.getFunctionType(Context.VoidTy, 5061 0, 0, EPI), 5062 /*TInfo=*/0, 5063 /*isExplicit=*/false, 5064 /*isInline=*/true, 5065 /*isImplicitlyDeclared=*/true); 5066 DefaultCon->setAccess(AS_public); 5067 DefaultCon->setImplicit(); 5068 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5069 5070 // Note that we have declared this constructor. 5071 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5072 5073 if (Scope *S = getScopeForContext(ClassDecl)) 5074 PushOnScopeChains(DefaultCon, S, false); 5075 ClassDecl->addDecl(DefaultCon); 5076 5077 return DefaultCon; 5078} 5079 5080void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5081 CXXConstructorDecl *Constructor) { 5082 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 5083 !Constructor->isUsed(false)) && 5084 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5085 5086 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5087 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5088 5089 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5090 DiagnosticErrorTrap Trap(Diags); 5091 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5092 Trap.hasErrorOccurred()) { 5093 Diag(CurrentLocation, diag::note_member_synthesized_at) 5094 << CXXConstructor << Context.getTagDeclType(ClassDecl); 5095 Constructor->setInvalidDecl(); 5096 return; 5097 } 5098 5099 SourceLocation Loc = Constructor->getLocation(); 5100 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5101 5102 Constructor->setUsed(); 5103 MarkVTableUsed(CurrentLocation, ClassDecl); 5104 5105 if (ASTMutationListener *L = getASTMutationListener()) { 5106 L->CompletedImplicitDefinition(Constructor); 5107 } 5108} 5109 5110void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5111 // We start with an initial pass over the base classes to collect those that 5112 // inherit constructors from. If there are none, we can forgo all further 5113 // processing. 5114 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5115 BasesVector BasesToInheritFrom; 5116 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5117 BaseE = ClassDecl->bases_end(); 5118 BaseIt != BaseE; ++BaseIt) { 5119 if (BaseIt->getInheritConstructors()) { 5120 QualType Base = BaseIt->getType(); 5121 if (Base->isDependentType()) { 5122 // If we inherit constructors from anything that is dependent, just 5123 // abort processing altogether. We'll get another chance for the 5124 // instantiations. 5125 return; 5126 } 5127 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5128 } 5129 } 5130 if (BasesToInheritFrom.empty()) 5131 return; 5132 5133 // Now collect the constructors that we already have in the current class. 5134 // Those take precedence over inherited constructors. 5135 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5136 // unless there is a user-declared constructor with the same signature in 5137 // the class where the using-declaration appears. 5138 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5139 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5140 CtorE = ClassDecl->ctor_end(); 5141 CtorIt != CtorE; ++CtorIt) { 5142 ExistingConstructors.insert( 5143 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5144 } 5145 5146 Scope *S = getScopeForContext(ClassDecl); 5147 DeclarationName CreatedCtorName = 5148 Context.DeclarationNames.getCXXConstructorName( 5149 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5150 5151 // Now comes the true work. 5152 // First, we keep a map from constructor types to the base that introduced 5153 // them. Needed for finding conflicting constructors. We also keep the 5154 // actually inserted declarations in there, for pretty diagnostics. 5155 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5156 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5157 ConstructorToSourceMap InheritedConstructors; 5158 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5159 BaseE = BasesToInheritFrom.end(); 5160 BaseIt != BaseE; ++BaseIt) { 5161 const RecordType *Base = *BaseIt; 5162 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5163 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5164 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5165 CtorE = BaseDecl->ctor_end(); 5166 CtorIt != CtorE; ++CtorIt) { 5167 // Find the using declaration for inheriting this base's constructors. 5168 DeclarationName Name = 5169 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5170 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5171 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5172 SourceLocation UsingLoc = UD ? UD->getLocation() : 5173 ClassDecl->getLocation(); 5174 5175 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5176 // from the class X named in the using-declaration consists of actual 5177 // constructors and notional constructors that result from the 5178 // transformation of defaulted parameters as follows: 5179 // - all non-template default constructors of X, and 5180 // - for each non-template constructor of X that has at least one 5181 // parameter with a default argument, the set of constructors that 5182 // results from omitting any ellipsis parameter specification and 5183 // successively omitting parameters with a default argument from the 5184 // end of the parameter-type-list. 5185 CXXConstructorDecl *BaseCtor = *CtorIt; 5186 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5187 const FunctionProtoType *BaseCtorType = 5188 BaseCtor->getType()->getAs<FunctionProtoType>(); 5189 5190 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5191 maxParams = BaseCtor->getNumParams(); 5192 params <= maxParams; ++params) { 5193 // Skip default constructors. They're never inherited. 5194 if (params == 0) 5195 continue; 5196 // Skip copy and move constructors for the same reason. 5197 if (CanBeCopyOrMove && params == 1) 5198 continue; 5199 5200 // Build up a function type for this particular constructor. 5201 // FIXME: The working paper does not consider that the exception spec 5202 // for the inheriting constructor might be larger than that of the 5203 // source. This code doesn't yet, either. 5204 const Type *NewCtorType; 5205 if (params == maxParams) 5206 NewCtorType = BaseCtorType; 5207 else { 5208 llvm::SmallVector<QualType, 16> Args; 5209 for (unsigned i = 0; i < params; ++i) { 5210 Args.push_back(BaseCtorType->getArgType(i)); 5211 } 5212 FunctionProtoType::ExtProtoInfo ExtInfo = 5213 BaseCtorType->getExtProtoInfo(); 5214 ExtInfo.Variadic = false; 5215 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5216 Args.data(), params, ExtInfo) 5217 .getTypePtr(); 5218 } 5219 const Type *CanonicalNewCtorType = 5220 Context.getCanonicalType(NewCtorType); 5221 5222 // Now that we have the type, first check if the class already has a 5223 // constructor with this signature. 5224 if (ExistingConstructors.count(CanonicalNewCtorType)) 5225 continue; 5226 5227 // Then we check if we have already declared an inherited constructor 5228 // with this signature. 5229 std::pair<ConstructorToSourceMap::iterator, bool> result = 5230 InheritedConstructors.insert(std::make_pair( 5231 CanonicalNewCtorType, 5232 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5233 if (!result.second) { 5234 // Already in the map. If it came from a different class, that's an 5235 // error. Not if it's from the same. 5236 CanQualType PreviousBase = result.first->second.first; 5237 if (CanonicalBase != PreviousBase) { 5238 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5239 const CXXConstructorDecl *PrevBaseCtor = 5240 PrevCtor->getInheritedConstructor(); 5241 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5242 5243 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5244 Diag(BaseCtor->getLocation(), 5245 diag::note_using_decl_constructor_conflict_current_ctor); 5246 Diag(PrevBaseCtor->getLocation(), 5247 diag::note_using_decl_constructor_conflict_previous_ctor); 5248 Diag(PrevCtor->getLocation(), 5249 diag::note_using_decl_constructor_conflict_previous_using); 5250 } 5251 continue; 5252 } 5253 5254 // OK, we're there, now add the constructor. 5255 // C++0x [class.inhctor]p8: [...] that would be performed by a 5256 // user-writtern inline constructor [...] 5257 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5258 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5259 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5260 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5261 /*ImplicitlyDeclared=*/true); 5262 NewCtor->setAccess(BaseCtor->getAccess()); 5263 5264 // Build up the parameter decls and add them. 5265 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5266 for (unsigned i = 0; i < params; ++i) { 5267 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5268 UsingLoc, UsingLoc, 5269 /*IdentifierInfo=*/0, 5270 BaseCtorType->getArgType(i), 5271 /*TInfo=*/0, SC_None, 5272 SC_None, /*DefaultArg=*/0)); 5273 } 5274 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5275 NewCtor->setInheritedConstructor(BaseCtor); 5276 5277 PushOnScopeChains(NewCtor, S, false); 5278 ClassDecl->addDecl(NewCtor); 5279 result.first->second.second = NewCtor; 5280 } 5281 } 5282 } 5283} 5284 5285CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5286 // C++ [class.dtor]p2: 5287 // If a class has no user-declared destructor, a destructor is 5288 // declared implicitly. An implicitly-declared destructor is an 5289 // inline public member of its class. 5290 5291 // C++ [except.spec]p14: 5292 // An implicitly declared special member function (Clause 12) shall have 5293 // an exception-specification. 5294 ImplicitExceptionSpecification ExceptSpec(Context); 5295 5296 // Direct base-class destructors. 5297 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5298 BEnd = ClassDecl->bases_end(); 5299 B != BEnd; ++B) { 5300 if (B->isVirtual()) // Handled below. 5301 continue; 5302 5303 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5304 ExceptSpec.CalledDecl( 5305 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5306 } 5307 5308 // Virtual base-class destructors. 5309 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5310 BEnd = ClassDecl->vbases_end(); 5311 B != BEnd; ++B) { 5312 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5313 ExceptSpec.CalledDecl( 5314 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5315 } 5316 5317 // Field destructors. 5318 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5319 FEnd = ClassDecl->field_end(); 5320 F != FEnd; ++F) { 5321 if (const RecordType *RecordTy 5322 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5323 ExceptSpec.CalledDecl( 5324 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5325 } 5326 5327 // Create the actual destructor declaration. 5328 FunctionProtoType::ExtProtoInfo EPI; 5329 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5330 EPI.NumExceptions = ExceptSpec.size(); 5331 EPI.Exceptions = ExceptSpec.data(); 5332 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5333 5334 CanQualType ClassType 5335 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5336 SourceLocation ClassLoc = ClassDecl->getLocation(); 5337 DeclarationName Name 5338 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5339 DeclarationNameInfo NameInfo(Name, ClassLoc); 5340 CXXDestructorDecl *Destructor 5341 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5342 /*isInline=*/true, 5343 /*isImplicitlyDeclared=*/true); 5344 Destructor->setAccess(AS_public); 5345 Destructor->setImplicit(); 5346 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5347 5348 // Note that we have declared this destructor. 5349 ++ASTContext::NumImplicitDestructorsDeclared; 5350 5351 // Introduce this destructor into its scope. 5352 if (Scope *S = getScopeForContext(ClassDecl)) 5353 PushOnScopeChains(Destructor, S, false); 5354 ClassDecl->addDecl(Destructor); 5355 5356 // This could be uniqued if it ever proves significant. 5357 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5358 5359 AddOverriddenMethods(ClassDecl, Destructor); 5360 5361 return Destructor; 5362} 5363 5364void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5365 CXXDestructorDecl *Destructor) { 5366 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5367 "DefineImplicitDestructor - call it for implicit default dtor"); 5368 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5369 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5370 5371 if (Destructor->isInvalidDecl()) 5372 return; 5373 5374 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5375 5376 DiagnosticErrorTrap Trap(Diags); 5377 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5378 Destructor->getParent()); 5379 5380 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5381 Diag(CurrentLocation, diag::note_member_synthesized_at) 5382 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5383 5384 Destructor->setInvalidDecl(); 5385 return; 5386 } 5387 5388 SourceLocation Loc = Destructor->getLocation(); 5389 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5390 5391 Destructor->setUsed(); 5392 MarkVTableUsed(CurrentLocation, ClassDecl); 5393 5394 if (ASTMutationListener *L = getASTMutationListener()) { 5395 L->CompletedImplicitDefinition(Destructor); 5396 } 5397} 5398 5399/// \brief Builds a statement that copies the given entity from \p From to 5400/// \c To. 5401/// 5402/// This routine is used to copy the members of a class with an 5403/// implicitly-declared copy assignment operator. When the entities being 5404/// copied are arrays, this routine builds for loops to copy them. 5405/// 5406/// \param S The Sema object used for type-checking. 5407/// 5408/// \param Loc The location where the implicit copy is being generated. 5409/// 5410/// \param T The type of the expressions being copied. Both expressions must 5411/// have this type. 5412/// 5413/// \param To The expression we are copying to. 5414/// 5415/// \param From The expression we are copying from. 5416/// 5417/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5418/// Otherwise, it's a non-static member subobject. 5419/// 5420/// \param Depth Internal parameter recording the depth of the recursion. 5421/// 5422/// \returns A statement or a loop that copies the expressions. 5423static StmtResult 5424BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5425 Expr *To, Expr *From, 5426 bool CopyingBaseSubobject, unsigned Depth = 0) { 5427 // C++0x [class.copy]p30: 5428 // Each subobject is assigned in the manner appropriate to its type: 5429 // 5430 // - if the subobject is of class type, the copy assignment operator 5431 // for the class is used (as if by explicit qualification; that is, 5432 // ignoring any possible virtual overriding functions in more derived 5433 // classes); 5434 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5435 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5436 5437 // Look for operator=. 5438 DeclarationName Name 5439 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5440 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5441 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5442 5443 // Filter out any result that isn't a copy-assignment operator. 5444 LookupResult::Filter F = OpLookup.makeFilter(); 5445 while (F.hasNext()) { 5446 NamedDecl *D = F.next(); 5447 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5448 if (Method->isCopyAssignmentOperator()) 5449 continue; 5450 5451 F.erase(); 5452 } 5453 F.done(); 5454 5455 // Suppress the protected check (C++ [class.protected]) for each of the 5456 // assignment operators we found. This strange dance is required when 5457 // we're assigning via a base classes's copy-assignment operator. To 5458 // ensure that we're getting the right base class subobject (without 5459 // ambiguities), we need to cast "this" to that subobject type; to 5460 // ensure that we don't go through the virtual call mechanism, we need 5461 // to qualify the operator= name with the base class (see below). However, 5462 // this means that if the base class has a protected copy assignment 5463 // operator, the protected member access check will fail. So, we 5464 // rewrite "protected" access to "public" access in this case, since we 5465 // know by construction that we're calling from a derived class. 5466 if (CopyingBaseSubobject) { 5467 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5468 L != LEnd; ++L) { 5469 if (L.getAccess() == AS_protected) 5470 L.setAccess(AS_public); 5471 } 5472 } 5473 5474 // Create the nested-name-specifier that will be used to qualify the 5475 // reference to operator=; this is required to suppress the virtual 5476 // call mechanism. 5477 CXXScopeSpec SS; 5478 SS.MakeTrivial(S.Context, 5479 NestedNameSpecifier::Create(S.Context, 0, false, 5480 T.getTypePtr()), 5481 Loc); 5482 5483 // Create the reference to operator=. 5484 ExprResult OpEqualRef 5485 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5486 /*FirstQualifierInScope=*/0, OpLookup, 5487 /*TemplateArgs=*/0, 5488 /*SuppressQualifierCheck=*/true); 5489 if (OpEqualRef.isInvalid()) 5490 return StmtError(); 5491 5492 // Build the call to the assignment operator. 5493 5494 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5495 OpEqualRef.takeAs<Expr>(), 5496 Loc, &From, 1, Loc); 5497 if (Call.isInvalid()) 5498 return StmtError(); 5499 5500 return S.Owned(Call.takeAs<Stmt>()); 5501 } 5502 5503 // - if the subobject is of scalar type, the built-in assignment 5504 // operator is used. 5505 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5506 if (!ArrayTy) { 5507 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5508 if (Assignment.isInvalid()) 5509 return StmtError(); 5510 5511 return S.Owned(Assignment.takeAs<Stmt>()); 5512 } 5513 5514 // - if the subobject is an array, each element is assigned, in the 5515 // manner appropriate to the element type; 5516 5517 // Construct a loop over the array bounds, e.g., 5518 // 5519 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5520 // 5521 // that will copy each of the array elements. 5522 QualType SizeType = S.Context.getSizeType(); 5523 5524 // Create the iteration variable. 5525 IdentifierInfo *IterationVarName = 0; 5526 { 5527 llvm::SmallString<8> Str; 5528 llvm::raw_svector_ostream OS(Str); 5529 OS << "__i" << Depth; 5530 IterationVarName = &S.Context.Idents.get(OS.str()); 5531 } 5532 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5533 IterationVarName, SizeType, 5534 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5535 SC_None, SC_None); 5536 5537 // Initialize the iteration variable to zero. 5538 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5539 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5540 5541 // Create a reference to the iteration variable; we'll use this several 5542 // times throughout. 5543 Expr *IterationVarRef 5544 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5545 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5546 5547 // Create the DeclStmt that holds the iteration variable. 5548 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5549 5550 // Create the comparison against the array bound. 5551 llvm::APInt Upper 5552 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5553 Expr *Comparison 5554 = new (S.Context) BinaryOperator(IterationVarRef, 5555 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5556 BO_NE, S.Context.BoolTy, 5557 VK_RValue, OK_Ordinary, Loc); 5558 5559 // Create the pre-increment of the iteration variable. 5560 Expr *Increment 5561 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5562 VK_LValue, OK_Ordinary, Loc); 5563 5564 // Subscript the "from" and "to" expressions with the iteration variable. 5565 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5566 IterationVarRef, Loc)); 5567 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5568 IterationVarRef, Loc)); 5569 5570 // Build the copy for an individual element of the array. 5571 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5572 To, From, CopyingBaseSubobject, 5573 Depth + 1); 5574 if (Copy.isInvalid()) 5575 return StmtError(); 5576 5577 // Construct the loop that copies all elements of this array. 5578 return S.ActOnForStmt(Loc, Loc, InitStmt, 5579 S.MakeFullExpr(Comparison), 5580 0, S.MakeFullExpr(Increment), 5581 Loc, Copy.take()); 5582} 5583 5584/// \brief Determine whether the given class has a copy assignment operator 5585/// that accepts a const-qualified argument. 5586static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5587 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5588 5589 if (!Class->hasDeclaredCopyAssignment()) 5590 S.DeclareImplicitCopyAssignment(Class); 5591 5592 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5593 DeclarationName OpName 5594 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5595 5596 DeclContext::lookup_const_iterator Op, OpEnd; 5597 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5598 // C++ [class.copy]p9: 5599 // A user-declared copy assignment operator is a non-static non-template 5600 // member function of class X with exactly one parameter of type X, X&, 5601 // const X&, volatile X& or const volatile X&. 5602 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5603 if (!Method) 5604 continue; 5605 5606 if (Method->isStatic()) 5607 continue; 5608 if (Method->getPrimaryTemplate()) 5609 continue; 5610 const FunctionProtoType *FnType = 5611 Method->getType()->getAs<FunctionProtoType>(); 5612 assert(FnType && "Overloaded operator has no prototype."); 5613 // Don't assert on this; an invalid decl might have been left in the AST. 5614 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5615 continue; 5616 bool AcceptsConst = true; 5617 QualType ArgType = FnType->getArgType(0); 5618 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5619 ArgType = Ref->getPointeeType(); 5620 // Is it a non-const lvalue reference? 5621 if (!ArgType.isConstQualified()) 5622 AcceptsConst = false; 5623 } 5624 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5625 continue; 5626 5627 // We have a single argument of type cv X or cv X&, i.e. we've found the 5628 // copy assignment operator. Return whether it accepts const arguments. 5629 return AcceptsConst; 5630 } 5631 assert(Class->isInvalidDecl() && 5632 "No copy assignment operator declared in valid code."); 5633 return false; 5634} 5635 5636CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5637 // Note: The following rules are largely analoguous to the copy 5638 // constructor rules. Note that virtual bases are not taken into account 5639 // for determining the argument type of the operator. Note also that 5640 // operators taking an object instead of a reference are allowed. 5641 5642 5643 // C++ [class.copy]p10: 5644 // If the class definition does not explicitly declare a copy 5645 // assignment operator, one is declared implicitly. 5646 // The implicitly-defined copy assignment operator for a class X 5647 // will have the form 5648 // 5649 // X& X::operator=(const X&) 5650 // 5651 // if 5652 bool HasConstCopyAssignment = true; 5653 5654 // -- each direct base class B of X has a copy assignment operator 5655 // whose parameter is of type const B&, const volatile B& or B, 5656 // and 5657 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5658 BaseEnd = ClassDecl->bases_end(); 5659 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5660 assert(!Base->getType()->isDependentType() && 5661 "Cannot generate implicit members for class with dependent bases."); 5662 const CXXRecordDecl *BaseClassDecl 5663 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5664 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5665 } 5666 5667 // -- for all the nonstatic data members of X that are of a class 5668 // type M (or array thereof), each such class type has a copy 5669 // assignment operator whose parameter is of type const M&, 5670 // const volatile M& or M. 5671 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5672 FieldEnd = ClassDecl->field_end(); 5673 HasConstCopyAssignment && Field != FieldEnd; 5674 ++Field) { 5675 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5676 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5677 const CXXRecordDecl *FieldClassDecl 5678 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5679 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5680 } 5681 } 5682 5683 // Otherwise, the implicitly declared copy assignment operator will 5684 // have the form 5685 // 5686 // X& X::operator=(X&) 5687 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5688 QualType RetType = Context.getLValueReferenceType(ArgType); 5689 if (HasConstCopyAssignment) 5690 ArgType = ArgType.withConst(); 5691 ArgType = Context.getLValueReferenceType(ArgType); 5692 5693 // C++ [except.spec]p14: 5694 // An implicitly declared special member function (Clause 12) shall have an 5695 // exception-specification. [...] 5696 ImplicitExceptionSpecification ExceptSpec(Context); 5697 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5698 BaseEnd = ClassDecl->bases_end(); 5699 Base != BaseEnd; ++Base) { 5700 CXXRecordDecl *BaseClassDecl 5701 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5702 5703 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5704 DeclareImplicitCopyAssignment(BaseClassDecl); 5705 5706 if (CXXMethodDecl *CopyAssign 5707 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5708 ExceptSpec.CalledDecl(CopyAssign); 5709 } 5710 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5711 FieldEnd = ClassDecl->field_end(); 5712 Field != FieldEnd; 5713 ++Field) { 5714 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5715 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5716 CXXRecordDecl *FieldClassDecl 5717 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5718 5719 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5720 DeclareImplicitCopyAssignment(FieldClassDecl); 5721 5722 if (CXXMethodDecl *CopyAssign 5723 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5724 ExceptSpec.CalledDecl(CopyAssign); 5725 } 5726 } 5727 5728 // An implicitly-declared copy assignment operator is an inline public 5729 // member of its class. 5730 FunctionProtoType::ExtProtoInfo EPI; 5731 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5732 EPI.NumExceptions = ExceptSpec.size(); 5733 EPI.Exceptions = ExceptSpec.data(); 5734 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5735 SourceLocation ClassLoc = ClassDecl->getLocation(); 5736 DeclarationNameInfo NameInfo(Name, ClassLoc); 5737 CXXMethodDecl *CopyAssignment 5738 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5739 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5740 /*TInfo=*/0, /*isStatic=*/false, 5741 /*StorageClassAsWritten=*/SC_None, 5742 /*isInline=*/true, 5743 SourceLocation()); 5744 CopyAssignment->setAccess(AS_public); 5745 CopyAssignment->setImplicit(); 5746 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5747 5748 // Add the parameter to the operator. 5749 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5750 ClassLoc, ClassLoc, /*Id=*/0, 5751 ArgType, /*TInfo=*/0, 5752 SC_None, 5753 SC_None, 0); 5754 CopyAssignment->setParams(&FromParam, 1); 5755 5756 // Note that we have added this copy-assignment operator. 5757 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5758 5759 if (Scope *S = getScopeForContext(ClassDecl)) 5760 PushOnScopeChains(CopyAssignment, S, false); 5761 ClassDecl->addDecl(CopyAssignment); 5762 5763 AddOverriddenMethods(ClassDecl, CopyAssignment); 5764 return CopyAssignment; 5765} 5766 5767void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5768 CXXMethodDecl *CopyAssignOperator) { 5769 assert((CopyAssignOperator->isImplicit() && 5770 CopyAssignOperator->isOverloadedOperator() && 5771 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5772 !CopyAssignOperator->isUsed(false)) && 5773 "DefineImplicitCopyAssignment called for wrong function"); 5774 5775 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5776 5777 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5778 CopyAssignOperator->setInvalidDecl(); 5779 return; 5780 } 5781 5782 CopyAssignOperator->setUsed(); 5783 5784 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5785 DiagnosticErrorTrap Trap(Diags); 5786 5787 // C++0x [class.copy]p30: 5788 // The implicitly-defined or explicitly-defaulted copy assignment operator 5789 // for a non-union class X performs memberwise copy assignment of its 5790 // subobjects. The direct base classes of X are assigned first, in the 5791 // order of their declaration in the base-specifier-list, and then the 5792 // immediate non-static data members of X are assigned, in the order in 5793 // which they were declared in the class definition. 5794 5795 // The statements that form the synthesized function body. 5796 ASTOwningVector<Stmt*> Statements(*this); 5797 5798 // The parameter for the "other" object, which we are copying from. 5799 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5800 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5801 QualType OtherRefType = Other->getType(); 5802 if (const LValueReferenceType *OtherRef 5803 = OtherRefType->getAs<LValueReferenceType>()) { 5804 OtherRefType = OtherRef->getPointeeType(); 5805 OtherQuals = OtherRefType.getQualifiers(); 5806 } 5807 5808 // Our location for everything implicitly-generated. 5809 SourceLocation Loc = CopyAssignOperator->getLocation(); 5810 5811 // Construct a reference to the "other" object. We'll be using this 5812 // throughout the generated ASTs. 5813 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5814 assert(OtherRef && "Reference to parameter cannot fail!"); 5815 5816 // Construct the "this" pointer. We'll be using this throughout the generated 5817 // ASTs. 5818 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5819 assert(This && "Reference to this cannot fail!"); 5820 5821 // Assign base classes. 5822 bool Invalid = false; 5823 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5824 E = ClassDecl->bases_end(); Base != E; ++Base) { 5825 // Form the assignment: 5826 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5827 QualType BaseType = Base->getType().getUnqualifiedType(); 5828 if (!BaseType->isRecordType()) { 5829 Invalid = true; 5830 continue; 5831 } 5832 5833 CXXCastPath BasePath; 5834 BasePath.push_back(Base); 5835 5836 // Construct the "from" expression, which is an implicit cast to the 5837 // appropriately-qualified base type. 5838 Expr *From = OtherRef; 5839 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5840 CK_UncheckedDerivedToBase, 5841 VK_LValue, &BasePath).take(); 5842 5843 // Dereference "this". 5844 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5845 5846 // Implicitly cast "this" to the appropriately-qualified base type. 5847 To = ImpCastExprToType(To.take(), 5848 Context.getCVRQualifiedType(BaseType, 5849 CopyAssignOperator->getTypeQualifiers()), 5850 CK_UncheckedDerivedToBase, 5851 VK_LValue, &BasePath); 5852 5853 // Build the copy. 5854 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5855 To.get(), From, 5856 /*CopyingBaseSubobject=*/true); 5857 if (Copy.isInvalid()) { 5858 Diag(CurrentLocation, diag::note_member_synthesized_at) 5859 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5860 CopyAssignOperator->setInvalidDecl(); 5861 return; 5862 } 5863 5864 // Success! Record the copy. 5865 Statements.push_back(Copy.takeAs<Expr>()); 5866 } 5867 5868 // \brief Reference to the __builtin_memcpy function. 5869 Expr *BuiltinMemCpyRef = 0; 5870 // \brief Reference to the __builtin_objc_memmove_collectable function. 5871 Expr *CollectableMemCpyRef = 0; 5872 5873 // Assign non-static members. 5874 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5875 FieldEnd = ClassDecl->field_end(); 5876 Field != FieldEnd; ++Field) { 5877 // Check for members of reference type; we can't copy those. 5878 if (Field->getType()->isReferenceType()) { 5879 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5880 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5881 Diag(Field->getLocation(), diag::note_declared_at); 5882 Diag(CurrentLocation, diag::note_member_synthesized_at) 5883 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5884 Invalid = true; 5885 continue; 5886 } 5887 5888 // Check for members of const-qualified, non-class type. 5889 QualType BaseType = Context.getBaseElementType(Field->getType()); 5890 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5891 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5892 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5893 Diag(Field->getLocation(), diag::note_declared_at); 5894 Diag(CurrentLocation, diag::note_member_synthesized_at) 5895 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5896 Invalid = true; 5897 continue; 5898 } 5899 5900 QualType FieldType = Field->getType().getNonReferenceType(); 5901 if (FieldType->isIncompleteArrayType()) { 5902 assert(ClassDecl->hasFlexibleArrayMember() && 5903 "Incomplete array type is not valid"); 5904 continue; 5905 } 5906 5907 // Build references to the field in the object we're copying from and to. 5908 CXXScopeSpec SS; // Intentionally empty 5909 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5910 LookupMemberName); 5911 MemberLookup.addDecl(*Field); 5912 MemberLookup.resolveKind(); 5913 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5914 Loc, /*IsArrow=*/false, 5915 SS, 0, MemberLookup, 0); 5916 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5917 Loc, /*IsArrow=*/true, 5918 SS, 0, MemberLookup, 0); 5919 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5920 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5921 5922 // If the field should be copied with __builtin_memcpy rather than via 5923 // explicit assignments, do so. This optimization only applies for arrays 5924 // of scalars and arrays of class type with trivial copy-assignment 5925 // operators. 5926 if (FieldType->isArrayType() && 5927 (!BaseType->isRecordType() || 5928 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5929 ->hasTrivialCopyAssignment())) { 5930 // Compute the size of the memory buffer to be copied. 5931 QualType SizeType = Context.getSizeType(); 5932 llvm::APInt Size(Context.getTypeSize(SizeType), 5933 Context.getTypeSizeInChars(BaseType).getQuantity()); 5934 for (const ConstantArrayType *Array 5935 = Context.getAsConstantArrayType(FieldType); 5936 Array; 5937 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5938 llvm::APInt ArraySize 5939 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5940 Size *= ArraySize; 5941 } 5942 5943 // Take the address of the field references for "from" and "to". 5944 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5945 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5946 5947 bool NeedsCollectableMemCpy = 5948 (BaseType->isRecordType() && 5949 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5950 5951 if (NeedsCollectableMemCpy) { 5952 if (!CollectableMemCpyRef) { 5953 // Create a reference to the __builtin_objc_memmove_collectable function. 5954 LookupResult R(*this, 5955 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5956 Loc, LookupOrdinaryName); 5957 LookupName(R, TUScope, true); 5958 5959 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5960 if (!CollectableMemCpy) { 5961 // Something went horribly wrong earlier, and we will have 5962 // complained about it. 5963 Invalid = true; 5964 continue; 5965 } 5966 5967 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5968 CollectableMemCpy->getType(), 5969 VK_LValue, Loc, 0).take(); 5970 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5971 } 5972 } 5973 // Create a reference to the __builtin_memcpy builtin function. 5974 else if (!BuiltinMemCpyRef) { 5975 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5976 LookupOrdinaryName); 5977 LookupName(R, TUScope, true); 5978 5979 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5980 if (!BuiltinMemCpy) { 5981 // Something went horribly wrong earlier, and we will have complained 5982 // about it. 5983 Invalid = true; 5984 continue; 5985 } 5986 5987 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5988 BuiltinMemCpy->getType(), 5989 VK_LValue, Loc, 0).take(); 5990 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5991 } 5992 5993 ASTOwningVector<Expr*> CallArgs(*this); 5994 CallArgs.push_back(To.takeAs<Expr>()); 5995 CallArgs.push_back(From.takeAs<Expr>()); 5996 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5997 ExprResult Call = ExprError(); 5998 if (NeedsCollectableMemCpy) 5999 Call = ActOnCallExpr(/*Scope=*/0, 6000 CollectableMemCpyRef, 6001 Loc, move_arg(CallArgs), 6002 Loc); 6003 else 6004 Call = ActOnCallExpr(/*Scope=*/0, 6005 BuiltinMemCpyRef, 6006 Loc, move_arg(CallArgs), 6007 Loc); 6008 6009 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6010 Statements.push_back(Call.takeAs<Expr>()); 6011 continue; 6012 } 6013 6014 // Build the copy of this field. 6015 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6016 To.get(), From.get(), 6017 /*CopyingBaseSubobject=*/false); 6018 if (Copy.isInvalid()) { 6019 Diag(CurrentLocation, diag::note_member_synthesized_at) 6020 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6021 CopyAssignOperator->setInvalidDecl(); 6022 return; 6023 } 6024 6025 // Success! Record the copy. 6026 Statements.push_back(Copy.takeAs<Stmt>()); 6027 } 6028 6029 if (!Invalid) { 6030 // Add a "return *this;" 6031 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6032 6033 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6034 if (Return.isInvalid()) 6035 Invalid = true; 6036 else { 6037 Statements.push_back(Return.takeAs<Stmt>()); 6038 6039 if (Trap.hasErrorOccurred()) { 6040 Diag(CurrentLocation, diag::note_member_synthesized_at) 6041 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6042 Invalid = true; 6043 } 6044 } 6045 } 6046 6047 if (Invalid) { 6048 CopyAssignOperator->setInvalidDecl(); 6049 return; 6050 } 6051 6052 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6053 /*isStmtExpr=*/false); 6054 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6055 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6056 6057 if (ASTMutationListener *L = getASTMutationListener()) { 6058 L->CompletedImplicitDefinition(CopyAssignOperator); 6059 } 6060} 6061 6062CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 6063 CXXRecordDecl *ClassDecl) { 6064 // C++ [class.copy]p4: 6065 // If the class definition does not explicitly declare a copy 6066 // constructor, one is declared implicitly. 6067 6068 // C++ [class.copy]p5: 6069 // The implicitly-declared copy constructor for a class X will 6070 // have the form 6071 // 6072 // X::X(const X&) 6073 // 6074 // if 6075 bool HasConstCopyConstructor = true; 6076 6077 // -- each direct or virtual base class B of X has a copy 6078 // constructor whose first parameter is of type const B& or 6079 // const volatile B&, and 6080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6081 BaseEnd = ClassDecl->bases_end(); 6082 HasConstCopyConstructor && Base != BaseEnd; 6083 ++Base) { 6084 // Virtual bases are handled below. 6085 if (Base->isVirtual()) 6086 continue; 6087 6088 CXXRecordDecl *BaseClassDecl 6089 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6090 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6091 DeclareImplicitCopyConstructor(BaseClassDecl); 6092 6093 HasConstCopyConstructor 6094 = BaseClassDecl->hasConstCopyConstructor(Context); 6095 } 6096 6097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6098 BaseEnd = ClassDecl->vbases_end(); 6099 HasConstCopyConstructor && Base != BaseEnd; 6100 ++Base) { 6101 CXXRecordDecl *BaseClassDecl 6102 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6103 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6104 DeclareImplicitCopyConstructor(BaseClassDecl); 6105 6106 HasConstCopyConstructor 6107 = BaseClassDecl->hasConstCopyConstructor(Context); 6108 } 6109 6110 // -- for all the nonstatic data members of X that are of a 6111 // class type M (or array thereof), each such class type 6112 // has a copy constructor whose first parameter is of type 6113 // const M& or const volatile M&. 6114 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6115 FieldEnd = ClassDecl->field_end(); 6116 HasConstCopyConstructor && Field != FieldEnd; 6117 ++Field) { 6118 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6119 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6120 CXXRecordDecl *FieldClassDecl 6121 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6122 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6123 DeclareImplicitCopyConstructor(FieldClassDecl); 6124 6125 HasConstCopyConstructor 6126 = FieldClassDecl->hasConstCopyConstructor(Context); 6127 } 6128 } 6129 6130 // Otherwise, the implicitly declared copy constructor will have 6131 // the form 6132 // 6133 // X::X(X&) 6134 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6135 QualType ArgType = ClassType; 6136 if (HasConstCopyConstructor) 6137 ArgType = ArgType.withConst(); 6138 ArgType = Context.getLValueReferenceType(ArgType); 6139 6140 // C++ [except.spec]p14: 6141 // An implicitly declared special member function (Clause 12) shall have an 6142 // exception-specification. [...] 6143 ImplicitExceptionSpecification ExceptSpec(Context); 6144 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6145 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6146 BaseEnd = ClassDecl->bases_end(); 6147 Base != BaseEnd; 6148 ++Base) { 6149 // Virtual bases are handled below. 6150 if (Base->isVirtual()) 6151 continue; 6152 6153 CXXRecordDecl *BaseClassDecl 6154 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6155 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6156 DeclareImplicitCopyConstructor(BaseClassDecl); 6157 6158 if (CXXConstructorDecl *CopyConstructor 6159 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6160 ExceptSpec.CalledDecl(CopyConstructor); 6161 } 6162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6163 BaseEnd = ClassDecl->vbases_end(); 6164 Base != BaseEnd; 6165 ++Base) { 6166 CXXRecordDecl *BaseClassDecl 6167 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6168 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6169 DeclareImplicitCopyConstructor(BaseClassDecl); 6170 6171 if (CXXConstructorDecl *CopyConstructor 6172 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6173 ExceptSpec.CalledDecl(CopyConstructor); 6174 } 6175 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6176 FieldEnd = ClassDecl->field_end(); 6177 Field != FieldEnd; 6178 ++Field) { 6179 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6180 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6181 CXXRecordDecl *FieldClassDecl 6182 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6183 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6184 DeclareImplicitCopyConstructor(FieldClassDecl); 6185 6186 if (CXXConstructorDecl *CopyConstructor 6187 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6188 ExceptSpec.CalledDecl(CopyConstructor); 6189 } 6190 } 6191 6192 // An implicitly-declared copy constructor is an inline public 6193 // member of its class. 6194 FunctionProtoType::ExtProtoInfo EPI; 6195 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6196 EPI.NumExceptions = ExceptSpec.size(); 6197 EPI.Exceptions = ExceptSpec.data(); 6198 DeclarationName Name 6199 = Context.DeclarationNames.getCXXConstructorName( 6200 Context.getCanonicalType(ClassType)); 6201 SourceLocation ClassLoc = ClassDecl->getLocation(); 6202 DeclarationNameInfo NameInfo(Name, ClassLoc); 6203 CXXConstructorDecl *CopyConstructor 6204 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6205 Context.getFunctionType(Context.VoidTy, 6206 &ArgType, 1, EPI), 6207 /*TInfo=*/0, 6208 /*isExplicit=*/false, 6209 /*isInline=*/true, 6210 /*isImplicitlyDeclared=*/true); 6211 CopyConstructor->setAccess(AS_public); 6212 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6213 6214 // Note that we have declared this constructor. 6215 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6216 6217 // Add the parameter to the constructor. 6218 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6219 ClassLoc, ClassLoc, 6220 /*IdentifierInfo=*/0, 6221 ArgType, /*TInfo=*/0, 6222 SC_None, 6223 SC_None, 0); 6224 CopyConstructor->setParams(&FromParam, 1); 6225 if (Scope *S = getScopeForContext(ClassDecl)) 6226 PushOnScopeChains(CopyConstructor, S, false); 6227 ClassDecl->addDecl(CopyConstructor); 6228 6229 return CopyConstructor; 6230} 6231 6232void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6233 CXXConstructorDecl *CopyConstructor, 6234 unsigned TypeQuals) { 6235 assert((CopyConstructor->isImplicit() && 6236 CopyConstructor->isCopyConstructor(TypeQuals) && 6237 !CopyConstructor->isUsed(false)) && 6238 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6239 6240 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6241 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6242 6243 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6244 DiagnosticErrorTrap Trap(Diags); 6245 6246 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6247 Trap.hasErrorOccurred()) { 6248 Diag(CurrentLocation, diag::note_member_synthesized_at) 6249 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6250 CopyConstructor->setInvalidDecl(); 6251 } else { 6252 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6253 CopyConstructor->getLocation(), 6254 MultiStmtArg(*this, 0, 0), 6255 /*isStmtExpr=*/false) 6256 .takeAs<Stmt>()); 6257 } 6258 6259 CopyConstructor->setUsed(); 6260 6261 if (ASTMutationListener *L = getASTMutationListener()) { 6262 L->CompletedImplicitDefinition(CopyConstructor); 6263 } 6264} 6265 6266ExprResult 6267Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6268 CXXConstructorDecl *Constructor, 6269 MultiExprArg ExprArgs, 6270 bool RequiresZeroInit, 6271 unsigned ConstructKind, 6272 SourceRange ParenRange) { 6273 bool Elidable = false; 6274 6275 // C++0x [class.copy]p34: 6276 // When certain criteria are met, an implementation is allowed to 6277 // omit the copy/move construction of a class object, even if the 6278 // copy/move constructor and/or destructor for the object have 6279 // side effects. [...] 6280 // - when a temporary class object that has not been bound to a 6281 // reference (12.2) would be copied/moved to a class object 6282 // with the same cv-unqualified type, the copy/move operation 6283 // can be omitted by constructing the temporary object 6284 // directly into the target of the omitted copy/move 6285 if (ConstructKind == CXXConstructExpr::CK_Complete && 6286 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6287 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6288 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6289 } 6290 6291 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6292 Elidable, move(ExprArgs), RequiresZeroInit, 6293 ConstructKind, ParenRange); 6294} 6295 6296/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6297/// including handling of its default argument expressions. 6298ExprResult 6299Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6300 CXXConstructorDecl *Constructor, bool Elidable, 6301 MultiExprArg ExprArgs, 6302 bool RequiresZeroInit, 6303 unsigned ConstructKind, 6304 SourceRange ParenRange) { 6305 unsigned NumExprs = ExprArgs.size(); 6306 Expr **Exprs = (Expr **)ExprArgs.release(); 6307 6308 for (specific_attr_iterator<NonNullAttr> 6309 i = Constructor->specific_attr_begin<NonNullAttr>(), 6310 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6311 const NonNullAttr *NonNull = *i; 6312 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6313 } 6314 6315 MarkDeclarationReferenced(ConstructLoc, Constructor); 6316 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6317 Constructor, Elidable, Exprs, NumExprs, 6318 RequiresZeroInit, 6319 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6320 ParenRange)); 6321} 6322 6323bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6324 CXXConstructorDecl *Constructor, 6325 MultiExprArg Exprs) { 6326 // FIXME: Provide the correct paren SourceRange when available. 6327 ExprResult TempResult = 6328 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6329 move(Exprs), false, CXXConstructExpr::CK_Complete, 6330 SourceRange()); 6331 if (TempResult.isInvalid()) 6332 return true; 6333 6334 Expr *Temp = TempResult.takeAs<Expr>(); 6335 CheckImplicitConversions(Temp, VD->getLocation()); 6336 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6337 Temp = MaybeCreateExprWithCleanups(Temp); 6338 VD->setInit(Temp); 6339 6340 return false; 6341} 6342 6343void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6344 if (VD->isInvalidDecl()) return; 6345 6346 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6347 if (ClassDecl->isInvalidDecl()) return; 6348 if (ClassDecl->hasTrivialDestructor()) return; 6349 if (ClassDecl->isDependentContext()) return; 6350 6351 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6352 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6353 CheckDestructorAccess(VD->getLocation(), Destructor, 6354 PDiag(diag::err_access_dtor_var) 6355 << VD->getDeclName() 6356 << VD->getType()); 6357 6358 if (!VD->hasGlobalStorage()) return; 6359 6360 // Emit warning for non-trivial dtor in global scope (a real global, 6361 // class-static, function-static). 6362 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6363 6364 // TODO: this should be re-enabled for static locals by !CXAAtExit 6365 if (!VD->isStaticLocal()) 6366 Diag(VD->getLocation(), diag::warn_global_destructor); 6367} 6368 6369/// AddCXXDirectInitializerToDecl - This action is called immediately after 6370/// ActOnDeclarator, when a C++ direct initializer is present. 6371/// e.g: "int x(1);" 6372void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6373 SourceLocation LParenLoc, 6374 MultiExprArg Exprs, 6375 SourceLocation RParenLoc, 6376 bool TypeMayContainAuto) { 6377 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6378 6379 // If there is no declaration, there was an error parsing it. Just ignore 6380 // the initializer. 6381 if (RealDecl == 0) 6382 return; 6383 6384 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6385 if (!VDecl) { 6386 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6387 RealDecl->setInvalidDecl(); 6388 return; 6389 } 6390 6391 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6392 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6393 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6394 if (Exprs.size() > 1) { 6395 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6396 diag::err_auto_var_init_multiple_expressions) 6397 << VDecl->getDeclName() << VDecl->getType() 6398 << VDecl->getSourceRange(); 6399 RealDecl->setInvalidDecl(); 6400 return; 6401 } 6402 6403 Expr *Init = Exprs.get()[0]; 6404 TypeSourceInfo *DeducedType = 0; 6405 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6406 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6407 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6408 << Init->getSourceRange(); 6409 if (!DeducedType) { 6410 RealDecl->setInvalidDecl(); 6411 return; 6412 } 6413 VDecl->setTypeSourceInfo(DeducedType); 6414 VDecl->setType(DeducedType->getType()); 6415 6416 // If this is a redeclaration, check that the type we just deduced matches 6417 // the previously declared type. 6418 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6419 MergeVarDeclTypes(VDecl, Old); 6420 } 6421 6422 // We will represent direct-initialization similarly to copy-initialization: 6423 // int x(1); -as-> int x = 1; 6424 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6425 // 6426 // Clients that want to distinguish between the two forms, can check for 6427 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6428 // A major benefit is that clients that don't particularly care about which 6429 // exactly form was it (like the CodeGen) can handle both cases without 6430 // special case code. 6431 6432 // C++ 8.5p11: 6433 // The form of initialization (using parentheses or '=') is generally 6434 // insignificant, but does matter when the entity being initialized has a 6435 // class type. 6436 6437 if (!VDecl->getType()->isDependentType() && 6438 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6439 diag::err_typecheck_decl_incomplete_type)) { 6440 VDecl->setInvalidDecl(); 6441 return; 6442 } 6443 6444 // The variable can not have an abstract class type. 6445 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6446 diag::err_abstract_type_in_decl, 6447 AbstractVariableType)) 6448 VDecl->setInvalidDecl(); 6449 6450 const VarDecl *Def; 6451 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6452 Diag(VDecl->getLocation(), diag::err_redefinition) 6453 << VDecl->getDeclName(); 6454 Diag(Def->getLocation(), diag::note_previous_definition); 6455 VDecl->setInvalidDecl(); 6456 return; 6457 } 6458 6459 // C++ [class.static.data]p4 6460 // If a static data member is of const integral or const 6461 // enumeration type, its declaration in the class definition can 6462 // specify a constant-initializer which shall be an integral 6463 // constant expression (5.19). In that case, the member can appear 6464 // in integral constant expressions. The member shall still be 6465 // defined in a namespace scope if it is used in the program and the 6466 // namespace scope definition shall not contain an initializer. 6467 // 6468 // We already performed a redefinition check above, but for static 6469 // data members we also need to check whether there was an in-class 6470 // declaration with an initializer. 6471 const VarDecl* PrevInit = 0; 6472 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6473 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6474 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6475 return; 6476 } 6477 6478 bool IsDependent = false; 6479 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6480 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6481 VDecl->setInvalidDecl(); 6482 return; 6483 } 6484 6485 if (Exprs.get()[I]->isTypeDependent()) 6486 IsDependent = true; 6487 } 6488 6489 // If either the declaration has a dependent type or if any of the 6490 // expressions is type-dependent, we represent the initialization 6491 // via a ParenListExpr for later use during template instantiation. 6492 if (VDecl->getType()->isDependentType() || IsDependent) { 6493 // Let clients know that initialization was done with a direct initializer. 6494 VDecl->setCXXDirectInitializer(true); 6495 6496 // Store the initialization expressions as a ParenListExpr. 6497 unsigned NumExprs = Exprs.size(); 6498 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6499 (Expr **)Exprs.release(), 6500 NumExprs, RParenLoc)); 6501 return; 6502 } 6503 6504 // Capture the variable that is being initialized and the style of 6505 // initialization. 6506 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6507 6508 // FIXME: Poor source location information. 6509 InitializationKind Kind 6510 = InitializationKind::CreateDirect(VDecl->getLocation(), 6511 LParenLoc, RParenLoc); 6512 6513 InitializationSequence InitSeq(*this, Entity, Kind, 6514 Exprs.get(), Exprs.size()); 6515 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6516 if (Result.isInvalid()) { 6517 VDecl->setInvalidDecl(); 6518 return; 6519 } 6520 6521 CheckImplicitConversions(Result.get(), LParenLoc); 6522 6523 Result = MaybeCreateExprWithCleanups(Result); 6524 VDecl->setInit(Result.takeAs<Expr>()); 6525 VDecl->setCXXDirectInitializer(true); 6526 6527 CheckCompleteVariableDeclaration(VDecl); 6528} 6529 6530/// \brief Given a constructor and the set of arguments provided for the 6531/// constructor, convert the arguments and add any required default arguments 6532/// to form a proper call to this constructor. 6533/// 6534/// \returns true if an error occurred, false otherwise. 6535bool 6536Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6537 MultiExprArg ArgsPtr, 6538 SourceLocation Loc, 6539 ASTOwningVector<Expr*> &ConvertedArgs) { 6540 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6541 unsigned NumArgs = ArgsPtr.size(); 6542 Expr **Args = (Expr **)ArgsPtr.get(); 6543 6544 const FunctionProtoType *Proto 6545 = Constructor->getType()->getAs<FunctionProtoType>(); 6546 assert(Proto && "Constructor without a prototype?"); 6547 unsigned NumArgsInProto = Proto->getNumArgs(); 6548 6549 // If too few arguments are available, we'll fill in the rest with defaults. 6550 if (NumArgs < NumArgsInProto) 6551 ConvertedArgs.reserve(NumArgsInProto); 6552 else 6553 ConvertedArgs.reserve(NumArgs); 6554 6555 VariadicCallType CallType = 6556 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6557 llvm::SmallVector<Expr *, 8> AllArgs; 6558 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6559 Proto, 0, Args, NumArgs, AllArgs, 6560 CallType); 6561 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6562 ConvertedArgs.push_back(AllArgs[i]); 6563 return Invalid; 6564} 6565 6566static inline bool 6567CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6568 const FunctionDecl *FnDecl) { 6569 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6570 if (isa<NamespaceDecl>(DC)) { 6571 return SemaRef.Diag(FnDecl->getLocation(), 6572 diag::err_operator_new_delete_declared_in_namespace) 6573 << FnDecl->getDeclName(); 6574 } 6575 6576 if (isa<TranslationUnitDecl>(DC) && 6577 FnDecl->getStorageClass() == SC_Static) { 6578 return SemaRef.Diag(FnDecl->getLocation(), 6579 diag::err_operator_new_delete_declared_static) 6580 << FnDecl->getDeclName(); 6581 } 6582 6583 return false; 6584} 6585 6586static inline bool 6587CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6588 CanQualType ExpectedResultType, 6589 CanQualType ExpectedFirstParamType, 6590 unsigned DependentParamTypeDiag, 6591 unsigned InvalidParamTypeDiag) { 6592 QualType ResultType = 6593 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6594 6595 // Check that the result type is not dependent. 6596 if (ResultType->isDependentType()) 6597 return SemaRef.Diag(FnDecl->getLocation(), 6598 diag::err_operator_new_delete_dependent_result_type) 6599 << FnDecl->getDeclName() << ExpectedResultType; 6600 6601 // Check that the result type is what we expect. 6602 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6603 return SemaRef.Diag(FnDecl->getLocation(), 6604 diag::err_operator_new_delete_invalid_result_type) 6605 << FnDecl->getDeclName() << ExpectedResultType; 6606 6607 // A function template must have at least 2 parameters. 6608 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6609 return SemaRef.Diag(FnDecl->getLocation(), 6610 diag::err_operator_new_delete_template_too_few_parameters) 6611 << FnDecl->getDeclName(); 6612 6613 // The function decl must have at least 1 parameter. 6614 if (FnDecl->getNumParams() == 0) 6615 return SemaRef.Diag(FnDecl->getLocation(), 6616 diag::err_operator_new_delete_too_few_parameters) 6617 << FnDecl->getDeclName(); 6618 6619 // Check the the first parameter type is not dependent. 6620 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6621 if (FirstParamType->isDependentType()) 6622 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6623 << FnDecl->getDeclName() << ExpectedFirstParamType; 6624 6625 // Check that the first parameter type is what we expect. 6626 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6627 ExpectedFirstParamType) 6628 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6629 << FnDecl->getDeclName() << ExpectedFirstParamType; 6630 6631 return false; 6632} 6633 6634static bool 6635CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6636 // C++ [basic.stc.dynamic.allocation]p1: 6637 // A program is ill-formed if an allocation function is declared in a 6638 // namespace scope other than global scope or declared static in global 6639 // scope. 6640 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6641 return true; 6642 6643 CanQualType SizeTy = 6644 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6645 6646 // C++ [basic.stc.dynamic.allocation]p1: 6647 // The return type shall be void*. The first parameter shall have type 6648 // std::size_t. 6649 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6650 SizeTy, 6651 diag::err_operator_new_dependent_param_type, 6652 diag::err_operator_new_param_type)) 6653 return true; 6654 6655 // C++ [basic.stc.dynamic.allocation]p1: 6656 // The first parameter shall not have an associated default argument. 6657 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6658 return SemaRef.Diag(FnDecl->getLocation(), 6659 diag::err_operator_new_default_arg) 6660 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6661 6662 return false; 6663} 6664 6665static bool 6666CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6667 // C++ [basic.stc.dynamic.deallocation]p1: 6668 // A program is ill-formed if deallocation functions are declared in a 6669 // namespace scope other than global scope or declared static in global 6670 // scope. 6671 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6672 return true; 6673 6674 // C++ [basic.stc.dynamic.deallocation]p2: 6675 // Each deallocation function shall return void and its first parameter 6676 // shall be void*. 6677 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6678 SemaRef.Context.VoidPtrTy, 6679 diag::err_operator_delete_dependent_param_type, 6680 diag::err_operator_delete_param_type)) 6681 return true; 6682 6683 return false; 6684} 6685 6686/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6687/// of this overloaded operator is well-formed. If so, returns false; 6688/// otherwise, emits appropriate diagnostics and returns true. 6689bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6690 assert(FnDecl && FnDecl->isOverloadedOperator() && 6691 "Expected an overloaded operator declaration"); 6692 6693 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6694 6695 // C++ [over.oper]p5: 6696 // The allocation and deallocation functions, operator new, 6697 // operator new[], operator delete and operator delete[], are 6698 // described completely in 3.7.3. The attributes and restrictions 6699 // found in the rest of this subclause do not apply to them unless 6700 // explicitly stated in 3.7.3. 6701 if (Op == OO_Delete || Op == OO_Array_Delete) 6702 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6703 6704 if (Op == OO_New || Op == OO_Array_New) 6705 return CheckOperatorNewDeclaration(*this, FnDecl); 6706 6707 // C++ [over.oper]p6: 6708 // An operator function shall either be a non-static member 6709 // function or be a non-member function and have at least one 6710 // parameter whose type is a class, a reference to a class, an 6711 // enumeration, or a reference to an enumeration. 6712 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6713 if (MethodDecl->isStatic()) 6714 return Diag(FnDecl->getLocation(), 6715 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6716 } else { 6717 bool ClassOrEnumParam = false; 6718 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6719 ParamEnd = FnDecl->param_end(); 6720 Param != ParamEnd; ++Param) { 6721 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6722 if (ParamType->isDependentType() || ParamType->isRecordType() || 6723 ParamType->isEnumeralType()) { 6724 ClassOrEnumParam = true; 6725 break; 6726 } 6727 } 6728 6729 if (!ClassOrEnumParam) 6730 return Diag(FnDecl->getLocation(), 6731 diag::err_operator_overload_needs_class_or_enum) 6732 << FnDecl->getDeclName(); 6733 } 6734 6735 // C++ [over.oper]p8: 6736 // An operator function cannot have default arguments (8.3.6), 6737 // except where explicitly stated below. 6738 // 6739 // Only the function-call operator allows default arguments 6740 // (C++ [over.call]p1). 6741 if (Op != OO_Call) { 6742 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6743 Param != FnDecl->param_end(); ++Param) { 6744 if ((*Param)->hasDefaultArg()) 6745 return Diag((*Param)->getLocation(), 6746 diag::err_operator_overload_default_arg) 6747 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6748 } 6749 } 6750 6751 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6752 { false, false, false } 6753#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6754 , { Unary, Binary, MemberOnly } 6755#include "clang/Basic/OperatorKinds.def" 6756 }; 6757 6758 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6759 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6760 bool MustBeMemberOperator = OperatorUses[Op][2]; 6761 6762 // C++ [over.oper]p8: 6763 // [...] Operator functions cannot have more or fewer parameters 6764 // than the number required for the corresponding operator, as 6765 // described in the rest of this subclause. 6766 unsigned NumParams = FnDecl->getNumParams() 6767 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6768 if (Op != OO_Call && 6769 ((NumParams == 1 && !CanBeUnaryOperator) || 6770 (NumParams == 2 && !CanBeBinaryOperator) || 6771 (NumParams < 1) || (NumParams > 2))) { 6772 // We have the wrong number of parameters. 6773 unsigned ErrorKind; 6774 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6775 ErrorKind = 2; // 2 -> unary or binary. 6776 } else if (CanBeUnaryOperator) { 6777 ErrorKind = 0; // 0 -> unary 6778 } else { 6779 assert(CanBeBinaryOperator && 6780 "All non-call overloaded operators are unary or binary!"); 6781 ErrorKind = 1; // 1 -> binary 6782 } 6783 6784 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6785 << FnDecl->getDeclName() << NumParams << ErrorKind; 6786 } 6787 6788 // Overloaded operators other than operator() cannot be variadic. 6789 if (Op != OO_Call && 6790 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6791 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6792 << FnDecl->getDeclName(); 6793 } 6794 6795 // Some operators must be non-static member functions. 6796 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6797 return Diag(FnDecl->getLocation(), 6798 diag::err_operator_overload_must_be_member) 6799 << FnDecl->getDeclName(); 6800 } 6801 6802 // C++ [over.inc]p1: 6803 // The user-defined function called operator++ implements the 6804 // prefix and postfix ++ operator. If this function is a member 6805 // function with no parameters, or a non-member function with one 6806 // parameter of class or enumeration type, it defines the prefix 6807 // increment operator ++ for objects of that type. If the function 6808 // is a member function with one parameter (which shall be of type 6809 // int) or a non-member function with two parameters (the second 6810 // of which shall be of type int), it defines the postfix 6811 // increment operator ++ for objects of that type. 6812 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6813 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6814 bool ParamIsInt = false; 6815 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6816 ParamIsInt = BT->getKind() == BuiltinType::Int; 6817 6818 if (!ParamIsInt) 6819 return Diag(LastParam->getLocation(), 6820 diag::err_operator_overload_post_incdec_must_be_int) 6821 << LastParam->getType() << (Op == OO_MinusMinus); 6822 } 6823 6824 return false; 6825} 6826 6827/// CheckLiteralOperatorDeclaration - Check whether the declaration 6828/// of this literal operator function is well-formed. If so, returns 6829/// false; otherwise, emits appropriate diagnostics and returns true. 6830bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6831 DeclContext *DC = FnDecl->getDeclContext(); 6832 Decl::Kind Kind = DC->getDeclKind(); 6833 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6834 Kind != Decl::LinkageSpec) { 6835 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6836 << FnDecl->getDeclName(); 6837 return true; 6838 } 6839 6840 bool Valid = false; 6841 6842 // template <char...> type operator "" name() is the only valid template 6843 // signature, and the only valid signature with no parameters. 6844 if (FnDecl->param_size() == 0) { 6845 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6846 // Must have only one template parameter 6847 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6848 if (Params->size() == 1) { 6849 NonTypeTemplateParmDecl *PmDecl = 6850 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6851 6852 // The template parameter must be a char parameter pack. 6853 if (PmDecl && PmDecl->isTemplateParameterPack() && 6854 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6855 Valid = true; 6856 } 6857 } 6858 } else { 6859 // Check the first parameter 6860 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6861 6862 QualType T = (*Param)->getType(); 6863 6864 // unsigned long long int, long double, and any character type are allowed 6865 // as the only parameters. 6866 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6867 Context.hasSameType(T, Context.LongDoubleTy) || 6868 Context.hasSameType(T, Context.CharTy) || 6869 Context.hasSameType(T, Context.WCharTy) || 6870 Context.hasSameType(T, Context.Char16Ty) || 6871 Context.hasSameType(T, Context.Char32Ty)) { 6872 if (++Param == FnDecl->param_end()) 6873 Valid = true; 6874 goto FinishedParams; 6875 } 6876 6877 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6878 const PointerType *PT = T->getAs<PointerType>(); 6879 if (!PT) 6880 goto FinishedParams; 6881 T = PT->getPointeeType(); 6882 if (!T.isConstQualified()) 6883 goto FinishedParams; 6884 T = T.getUnqualifiedType(); 6885 6886 // Move on to the second parameter; 6887 ++Param; 6888 6889 // If there is no second parameter, the first must be a const char * 6890 if (Param == FnDecl->param_end()) { 6891 if (Context.hasSameType(T, Context.CharTy)) 6892 Valid = true; 6893 goto FinishedParams; 6894 } 6895 6896 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6897 // are allowed as the first parameter to a two-parameter function 6898 if (!(Context.hasSameType(T, Context.CharTy) || 6899 Context.hasSameType(T, Context.WCharTy) || 6900 Context.hasSameType(T, Context.Char16Ty) || 6901 Context.hasSameType(T, Context.Char32Ty))) 6902 goto FinishedParams; 6903 6904 // The second and final parameter must be an std::size_t 6905 T = (*Param)->getType().getUnqualifiedType(); 6906 if (Context.hasSameType(T, Context.getSizeType()) && 6907 ++Param == FnDecl->param_end()) 6908 Valid = true; 6909 } 6910 6911 // FIXME: This diagnostic is absolutely terrible. 6912FinishedParams: 6913 if (!Valid) { 6914 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6915 << FnDecl->getDeclName(); 6916 return true; 6917 } 6918 6919 return false; 6920} 6921 6922/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6923/// linkage specification, including the language and (if present) 6924/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6925/// the location of the language string literal, which is provided 6926/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6927/// the '{' brace. Otherwise, this linkage specification does not 6928/// have any braces. 6929Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6930 SourceLocation LangLoc, 6931 llvm::StringRef Lang, 6932 SourceLocation LBraceLoc) { 6933 LinkageSpecDecl::LanguageIDs Language; 6934 if (Lang == "\"C\"") 6935 Language = LinkageSpecDecl::lang_c; 6936 else if (Lang == "\"C++\"") 6937 Language = LinkageSpecDecl::lang_cxx; 6938 else { 6939 Diag(LangLoc, diag::err_bad_language); 6940 return 0; 6941 } 6942 6943 // FIXME: Add all the various semantics of linkage specifications 6944 6945 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6946 ExternLoc, LangLoc, Language); 6947 CurContext->addDecl(D); 6948 PushDeclContext(S, D); 6949 return D; 6950} 6951 6952/// ActOnFinishLinkageSpecification - Complete the definition of 6953/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6954/// valid, it's the position of the closing '}' brace in a linkage 6955/// specification that uses braces. 6956Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6957 Decl *LinkageSpec, 6958 SourceLocation RBraceLoc) { 6959 if (LinkageSpec) { 6960 if (RBraceLoc.isValid()) { 6961 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6962 LSDecl->setRBraceLoc(RBraceLoc); 6963 } 6964 PopDeclContext(); 6965 } 6966 return LinkageSpec; 6967} 6968 6969/// \brief Perform semantic analysis for the variable declaration that 6970/// occurs within a C++ catch clause, returning the newly-created 6971/// variable. 6972VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6973 TypeSourceInfo *TInfo, 6974 SourceLocation StartLoc, 6975 SourceLocation Loc, 6976 IdentifierInfo *Name) { 6977 bool Invalid = false; 6978 QualType ExDeclType = TInfo->getType(); 6979 6980 // Arrays and functions decay. 6981 if (ExDeclType->isArrayType()) 6982 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6983 else if (ExDeclType->isFunctionType()) 6984 ExDeclType = Context.getPointerType(ExDeclType); 6985 6986 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6987 // The exception-declaration shall not denote a pointer or reference to an 6988 // incomplete type, other than [cv] void*. 6989 // N2844 forbids rvalue references. 6990 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6991 Diag(Loc, diag::err_catch_rvalue_ref); 6992 Invalid = true; 6993 } 6994 6995 // GCC allows catching pointers and references to incomplete types 6996 // as an extension; so do we, but we warn by default. 6997 6998 QualType BaseType = ExDeclType; 6999 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7000 unsigned DK = diag::err_catch_incomplete; 7001 bool IncompleteCatchIsInvalid = true; 7002 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7003 BaseType = Ptr->getPointeeType(); 7004 Mode = 1; 7005 DK = diag::ext_catch_incomplete_ptr; 7006 IncompleteCatchIsInvalid = false; 7007 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7008 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7009 BaseType = Ref->getPointeeType(); 7010 Mode = 2; 7011 DK = diag::ext_catch_incomplete_ref; 7012 IncompleteCatchIsInvalid = false; 7013 } 7014 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7015 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7016 IncompleteCatchIsInvalid) 7017 Invalid = true; 7018 7019 if (!Invalid && !ExDeclType->isDependentType() && 7020 RequireNonAbstractType(Loc, ExDeclType, 7021 diag::err_abstract_type_in_decl, 7022 AbstractVariableType)) 7023 Invalid = true; 7024 7025 // Only the non-fragile NeXT runtime currently supports C++ catches 7026 // of ObjC types, and no runtime supports catching ObjC types by value. 7027 if (!Invalid && getLangOptions().ObjC1) { 7028 QualType T = ExDeclType; 7029 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7030 T = RT->getPointeeType(); 7031 7032 if (T->isObjCObjectType()) { 7033 Diag(Loc, diag::err_objc_object_catch); 7034 Invalid = true; 7035 } else if (T->isObjCObjectPointerType()) { 7036 if (!getLangOptions().ObjCNonFragileABI) { 7037 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7038 Invalid = true; 7039 } 7040 } 7041 } 7042 7043 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7044 ExDeclType, TInfo, SC_None, SC_None); 7045 ExDecl->setExceptionVariable(true); 7046 7047 if (!Invalid) { 7048 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7049 // C++ [except.handle]p16: 7050 // The object declared in an exception-declaration or, if the 7051 // exception-declaration does not specify a name, a temporary (12.2) is 7052 // copy-initialized (8.5) from the exception object. [...] 7053 // The object is destroyed when the handler exits, after the destruction 7054 // of any automatic objects initialized within the handler. 7055 // 7056 // We just pretend to initialize the object with itself, then make sure 7057 // it can be destroyed later. 7058 QualType initType = ExDeclType; 7059 7060 InitializedEntity entity = 7061 InitializedEntity::InitializeVariable(ExDecl); 7062 InitializationKind initKind = 7063 InitializationKind::CreateCopy(Loc, SourceLocation()); 7064 7065 Expr *opaqueValue = 7066 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 7067 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 7068 ExprResult result = sequence.Perform(*this, entity, initKind, 7069 MultiExprArg(&opaqueValue, 1)); 7070 if (result.isInvalid()) 7071 Invalid = true; 7072 else { 7073 // If the constructor used was non-trivial, set this as the 7074 // "initializer". 7075 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 7076 if (!construct->getConstructor()->isTrivial()) { 7077 Expr *init = MaybeCreateExprWithCleanups(construct); 7078 ExDecl->setInit(init); 7079 } 7080 7081 // And make sure it's destructable. 7082 FinalizeVarWithDestructor(ExDecl, recordType); 7083 } 7084 } 7085 } 7086 7087 if (Invalid) 7088 ExDecl->setInvalidDecl(); 7089 7090 return ExDecl; 7091} 7092 7093/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7094/// handler. 7095Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7096 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7097 bool Invalid = D.isInvalidType(); 7098 7099 // Check for unexpanded parameter packs. 7100 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7101 UPPC_ExceptionType)) { 7102 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7103 D.getIdentifierLoc()); 7104 Invalid = true; 7105 } 7106 7107 IdentifierInfo *II = D.getIdentifier(); 7108 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7109 LookupOrdinaryName, 7110 ForRedeclaration)) { 7111 // The scope should be freshly made just for us. There is just no way 7112 // it contains any previous declaration. 7113 assert(!S->isDeclScope(PrevDecl)); 7114 if (PrevDecl->isTemplateParameter()) { 7115 // Maybe we will complain about the shadowed template parameter. 7116 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7117 } 7118 } 7119 7120 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7121 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7122 << D.getCXXScopeSpec().getRange(); 7123 Invalid = true; 7124 } 7125 7126 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7127 D.getSourceRange().getBegin(), 7128 D.getIdentifierLoc(), 7129 D.getIdentifier()); 7130 if (Invalid) 7131 ExDecl->setInvalidDecl(); 7132 7133 // Add the exception declaration into this scope. 7134 if (II) 7135 PushOnScopeChains(ExDecl, S); 7136 else 7137 CurContext->addDecl(ExDecl); 7138 7139 ProcessDeclAttributes(S, ExDecl, D); 7140 return ExDecl; 7141} 7142 7143Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7144 Expr *AssertExpr, 7145 Expr *AssertMessageExpr_, 7146 SourceLocation RParenLoc) { 7147 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7148 7149 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7150 llvm::APSInt Value(32); 7151 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7152 Diag(StaticAssertLoc, 7153 diag::err_static_assert_expression_is_not_constant) << 7154 AssertExpr->getSourceRange(); 7155 return 0; 7156 } 7157 7158 if (Value == 0) { 7159 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7160 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7161 } 7162 } 7163 7164 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7165 return 0; 7166 7167 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7168 AssertExpr, AssertMessage, RParenLoc); 7169 7170 CurContext->addDecl(Decl); 7171 return Decl; 7172} 7173 7174/// \brief Perform semantic analysis of the given friend type declaration. 7175/// 7176/// \returns A friend declaration that. 7177FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7178 TypeSourceInfo *TSInfo) { 7179 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7180 7181 QualType T = TSInfo->getType(); 7182 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7183 7184 if (!getLangOptions().CPlusPlus0x) { 7185 // C++03 [class.friend]p2: 7186 // An elaborated-type-specifier shall be used in a friend declaration 7187 // for a class.* 7188 // 7189 // * The class-key of the elaborated-type-specifier is required. 7190 if (!ActiveTemplateInstantiations.empty()) { 7191 // Do not complain about the form of friend template types during 7192 // template instantiation; we will already have complained when the 7193 // template was declared. 7194 } else if (!T->isElaboratedTypeSpecifier()) { 7195 // If we evaluated the type to a record type, suggest putting 7196 // a tag in front. 7197 if (const RecordType *RT = T->getAs<RecordType>()) { 7198 RecordDecl *RD = RT->getDecl(); 7199 7200 std::string InsertionText = std::string(" ") + RD->getKindName(); 7201 7202 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7203 << (unsigned) RD->getTagKind() 7204 << T 7205 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7206 InsertionText); 7207 } else { 7208 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7209 << T 7210 << SourceRange(FriendLoc, TypeRange.getEnd()); 7211 } 7212 } else if (T->getAs<EnumType>()) { 7213 Diag(FriendLoc, diag::ext_enum_friend) 7214 << T 7215 << SourceRange(FriendLoc, TypeRange.getEnd()); 7216 } 7217 } 7218 7219 // C++0x [class.friend]p3: 7220 // If the type specifier in a friend declaration designates a (possibly 7221 // cv-qualified) class type, that class is declared as a friend; otherwise, 7222 // the friend declaration is ignored. 7223 7224 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7225 // in [class.friend]p3 that we do not implement. 7226 7227 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7228} 7229 7230/// Handle a friend tag declaration where the scope specifier was 7231/// templated. 7232Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7233 unsigned TagSpec, SourceLocation TagLoc, 7234 CXXScopeSpec &SS, 7235 IdentifierInfo *Name, SourceLocation NameLoc, 7236 AttributeList *Attr, 7237 MultiTemplateParamsArg TempParamLists) { 7238 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7239 7240 bool isExplicitSpecialization = false; 7241 bool Invalid = false; 7242 7243 if (TemplateParameterList *TemplateParams 7244 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7245 TempParamLists.get(), 7246 TempParamLists.size(), 7247 /*friend*/ true, 7248 isExplicitSpecialization, 7249 Invalid)) { 7250 if (TemplateParams->size() > 0) { 7251 // This is a declaration of a class template. 7252 if (Invalid) 7253 return 0; 7254 7255 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7256 SS, Name, NameLoc, Attr, 7257 TemplateParams, AS_public, 7258 TempParamLists.size() - 1, 7259 (TemplateParameterList**) TempParamLists.release()).take(); 7260 } else { 7261 // The "template<>" header is extraneous. 7262 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7263 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7264 isExplicitSpecialization = true; 7265 } 7266 } 7267 7268 if (Invalid) return 0; 7269 7270 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7271 7272 bool isAllExplicitSpecializations = true; 7273 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7274 if (TempParamLists.get()[I]->size()) { 7275 isAllExplicitSpecializations = false; 7276 break; 7277 } 7278 } 7279 7280 // FIXME: don't ignore attributes. 7281 7282 // If it's explicit specializations all the way down, just forget 7283 // about the template header and build an appropriate non-templated 7284 // friend. TODO: for source fidelity, remember the headers. 7285 if (isAllExplicitSpecializations) { 7286 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7287 ElaboratedTypeKeyword Keyword 7288 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7289 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7290 *Name, NameLoc); 7291 if (T.isNull()) 7292 return 0; 7293 7294 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7295 if (isa<DependentNameType>(T)) { 7296 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7297 TL.setKeywordLoc(TagLoc); 7298 TL.setQualifierLoc(QualifierLoc); 7299 TL.setNameLoc(NameLoc); 7300 } else { 7301 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7302 TL.setKeywordLoc(TagLoc); 7303 TL.setQualifierLoc(QualifierLoc); 7304 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7305 } 7306 7307 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7308 TSI, FriendLoc); 7309 Friend->setAccess(AS_public); 7310 CurContext->addDecl(Friend); 7311 return Friend; 7312 } 7313 7314 // Handle the case of a templated-scope friend class. e.g. 7315 // template <class T> class A<T>::B; 7316 // FIXME: we don't support these right now. 7317 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7318 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7319 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7320 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7321 TL.setKeywordLoc(TagLoc); 7322 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7323 TL.setNameLoc(NameLoc); 7324 7325 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7326 TSI, FriendLoc); 7327 Friend->setAccess(AS_public); 7328 Friend->setUnsupportedFriend(true); 7329 CurContext->addDecl(Friend); 7330 return Friend; 7331} 7332 7333 7334/// Handle a friend type declaration. This works in tandem with 7335/// ActOnTag. 7336/// 7337/// Notes on friend class templates: 7338/// 7339/// We generally treat friend class declarations as if they were 7340/// declaring a class. So, for example, the elaborated type specifier 7341/// in a friend declaration is required to obey the restrictions of a 7342/// class-head (i.e. no typedefs in the scope chain), template 7343/// parameters are required to match up with simple template-ids, &c. 7344/// However, unlike when declaring a template specialization, it's 7345/// okay to refer to a template specialization without an empty 7346/// template parameter declaration, e.g. 7347/// friend class A<T>::B<unsigned>; 7348/// We permit this as a special case; if there are any template 7349/// parameters present at all, require proper matching, i.e. 7350/// template <> template <class T> friend class A<int>::B; 7351Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7352 MultiTemplateParamsArg TempParams) { 7353 SourceLocation Loc = DS.getSourceRange().getBegin(); 7354 7355 assert(DS.isFriendSpecified()); 7356 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7357 7358 // Try to convert the decl specifier to a type. This works for 7359 // friend templates because ActOnTag never produces a ClassTemplateDecl 7360 // for a TUK_Friend. 7361 Declarator TheDeclarator(DS, Declarator::MemberContext); 7362 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7363 QualType T = TSI->getType(); 7364 if (TheDeclarator.isInvalidType()) 7365 return 0; 7366 7367 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7368 return 0; 7369 7370 // This is definitely an error in C++98. It's probably meant to 7371 // be forbidden in C++0x, too, but the specification is just 7372 // poorly written. 7373 // 7374 // The problem is with declarations like the following: 7375 // template <T> friend A<T>::foo; 7376 // where deciding whether a class C is a friend or not now hinges 7377 // on whether there exists an instantiation of A that causes 7378 // 'foo' to equal C. There are restrictions on class-heads 7379 // (which we declare (by fiat) elaborated friend declarations to 7380 // be) that makes this tractable. 7381 // 7382 // FIXME: handle "template <> friend class A<T>;", which 7383 // is possibly well-formed? Who even knows? 7384 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7385 Diag(Loc, diag::err_tagless_friend_type_template) 7386 << DS.getSourceRange(); 7387 return 0; 7388 } 7389 7390 // C++98 [class.friend]p1: A friend of a class is a function 7391 // or class that is not a member of the class . . . 7392 // This is fixed in DR77, which just barely didn't make the C++03 7393 // deadline. It's also a very silly restriction that seriously 7394 // affects inner classes and which nobody else seems to implement; 7395 // thus we never diagnose it, not even in -pedantic. 7396 // 7397 // But note that we could warn about it: it's always useless to 7398 // friend one of your own members (it's not, however, worthless to 7399 // friend a member of an arbitrary specialization of your template). 7400 7401 Decl *D; 7402 if (unsigned NumTempParamLists = TempParams.size()) 7403 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7404 NumTempParamLists, 7405 TempParams.release(), 7406 TSI, 7407 DS.getFriendSpecLoc()); 7408 else 7409 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7410 7411 if (!D) 7412 return 0; 7413 7414 D->setAccess(AS_public); 7415 CurContext->addDecl(D); 7416 7417 return D; 7418} 7419 7420Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7421 MultiTemplateParamsArg TemplateParams) { 7422 const DeclSpec &DS = D.getDeclSpec(); 7423 7424 assert(DS.isFriendSpecified()); 7425 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7426 7427 SourceLocation Loc = D.getIdentifierLoc(); 7428 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7429 QualType T = TInfo->getType(); 7430 7431 // C++ [class.friend]p1 7432 // A friend of a class is a function or class.... 7433 // Note that this sees through typedefs, which is intended. 7434 // It *doesn't* see through dependent types, which is correct 7435 // according to [temp.arg.type]p3: 7436 // If a declaration acquires a function type through a 7437 // type dependent on a template-parameter and this causes 7438 // a declaration that does not use the syntactic form of a 7439 // function declarator to have a function type, the program 7440 // is ill-formed. 7441 if (!T->isFunctionType()) { 7442 Diag(Loc, diag::err_unexpected_friend); 7443 7444 // It might be worthwhile to try to recover by creating an 7445 // appropriate declaration. 7446 return 0; 7447 } 7448 7449 // C++ [namespace.memdef]p3 7450 // - If a friend declaration in a non-local class first declares a 7451 // class or function, the friend class or function is a member 7452 // of the innermost enclosing namespace. 7453 // - The name of the friend is not found by simple name lookup 7454 // until a matching declaration is provided in that namespace 7455 // scope (either before or after the class declaration granting 7456 // friendship). 7457 // - If a friend function is called, its name may be found by the 7458 // name lookup that considers functions from namespaces and 7459 // classes associated with the types of the function arguments. 7460 // - When looking for a prior declaration of a class or a function 7461 // declared as a friend, scopes outside the innermost enclosing 7462 // namespace scope are not considered. 7463 7464 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7465 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7466 DeclarationName Name = NameInfo.getName(); 7467 assert(Name); 7468 7469 // Check for unexpanded parameter packs. 7470 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7471 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7472 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7473 return 0; 7474 7475 // The context we found the declaration in, or in which we should 7476 // create the declaration. 7477 DeclContext *DC; 7478 Scope *DCScope = S; 7479 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7480 ForRedeclaration); 7481 7482 // FIXME: there are different rules in local classes 7483 7484 // There are four cases here. 7485 // - There's no scope specifier, in which case we just go to the 7486 // appropriate scope and look for a function or function template 7487 // there as appropriate. 7488 // Recover from invalid scope qualifiers as if they just weren't there. 7489 if (SS.isInvalid() || !SS.isSet()) { 7490 // C++0x [namespace.memdef]p3: 7491 // If the name in a friend declaration is neither qualified nor 7492 // a template-id and the declaration is a function or an 7493 // elaborated-type-specifier, the lookup to determine whether 7494 // the entity has been previously declared shall not consider 7495 // any scopes outside the innermost enclosing namespace. 7496 // C++0x [class.friend]p11: 7497 // If a friend declaration appears in a local class and the name 7498 // specified is an unqualified name, a prior declaration is 7499 // looked up without considering scopes that are outside the 7500 // innermost enclosing non-class scope. For a friend function 7501 // declaration, if there is no prior declaration, the program is 7502 // ill-formed. 7503 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7504 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7505 7506 // Find the appropriate context according to the above. 7507 DC = CurContext; 7508 while (true) { 7509 // Skip class contexts. If someone can cite chapter and verse 7510 // for this behavior, that would be nice --- it's what GCC and 7511 // EDG do, and it seems like a reasonable intent, but the spec 7512 // really only says that checks for unqualified existing 7513 // declarations should stop at the nearest enclosing namespace, 7514 // not that they should only consider the nearest enclosing 7515 // namespace. 7516 while (DC->isRecord()) 7517 DC = DC->getParent(); 7518 7519 LookupQualifiedName(Previous, DC); 7520 7521 // TODO: decide what we think about using declarations. 7522 if (isLocal || !Previous.empty()) 7523 break; 7524 7525 if (isTemplateId) { 7526 if (isa<TranslationUnitDecl>(DC)) break; 7527 } else { 7528 if (DC->isFileContext()) break; 7529 } 7530 DC = DC->getParent(); 7531 } 7532 7533 // C++ [class.friend]p1: A friend of a class is a function or 7534 // class that is not a member of the class . . . 7535 // C++0x changes this for both friend types and functions. 7536 // Most C++ 98 compilers do seem to give an error here, so 7537 // we do, too. 7538 if (!Previous.empty() && DC->Equals(CurContext) 7539 && !getLangOptions().CPlusPlus0x) 7540 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7541 7542 DCScope = getScopeForDeclContext(S, DC); 7543 7544 // - There's a non-dependent scope specifier, in which case we 7545 // compute it and do a previous lookup there for a function 7546 // or function template. 7547 } else if (!SS.getScopeRep()->isDependent()) { 7548 DC = computeDeclContext(SS); 7549 if (!DC) return 0; 7550 7551 if (RequireCompleteDeclContext(SS, DC)) return 0; 7552 7553 LookupQualifiedName(Previous, DC); 7554 7555 // Ignore things found implicitly in the wrong scope. 7556 // TODO: better diagnostics for this case. Suggesting the right 7557 // qualified scope would be nice... 7558 LookupResult::Filter F = Previous.makeFilter(); 7559 while (F.hasNext()) { 7560 NamedDecl *D = F.next(); 7561 if (!DC->InEnclosingNamespaceSetOf( 7562 D->getDeclContext()->getRedeclContext())) 7563 F.erase(); 7564 } 7565 F.done(); 7566 7567 if (Previous.empty()) { 7568 D.setInvalidType(); 7569 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7570 return 0; 7571 } 7572 7573 // C++ [class.friend]p1: A friend of a class is a function or 7574 // class that is not a member of the class . . . 7575 if (DC->Equals(CurContext)) 7576 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7577 7578 // - There's a scope specifier that does not match any template 7579 // parameter lists, in which case we use some arbitrary context, 7580 // create a method or method template, and wait for instantiation. 7581 // - There's a scope specifier that does match some template 7582 // parameter lists, which we don't handle right now. 7583 } else { 7584 DC = CurContext; 7585 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7586 } 7587 7588 if (!DC->isRecord()) { 7589 // This implies that it has to be an operator or function. 7590 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7591 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7592 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7593 Diag(Loc, diag::err_introducing_special_friend) << 7594 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7595 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7596 return 0; 7597 } 7598 } 7599 7600 bool Redeclaration = false; 7601 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7602 move(TemplateParams), 7603 IsDefinition, 7604 Redeclaration); 7605 if (!ND) return 0; 7606 7607 assert(ND->getDeclContext() == DC); 7608 assert(ND->getLexicalDeclContext() == CurContext); 7609 7610 // Add the function declaration to the appropriate lookup tables, 7611 // adjusting the redeclarations list as necessary. We don't 7612 // want to do this yet if the friending class is dependent. 7613 // 7614 // Also update the scope-based lookup if the target context's 7615 // lookup context is in lexical scope. 7616 if (!CurContext->isDependentContext()) { 7617 DC = DC->getRedeclContext(); 7618 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7619 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7620 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7621 } 7622 7623 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7624 D.getIdentifierLoc(), ND, 7625 DS.getFriendSpecLoc()); 7626 FrD->setAccess(AS_public); 7627 CurContext->addDecl(FrD); 7628 7629 if (ND->isInvalidDecl()) 7630 FrD->setInvalidDecl(); 7631 else { 7632 FunctionDecl *FD; 7633 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7634 FD = FTD->getTemplatedDecl(); 7635 else 7636 FD = cast<FunctionDecl>(ND); 7637 7638 // Mark templated-scope function declarations as unsupported. 7639 if (FD->getNumTemplateParameterLists()) 7640 FrD->setUnsupportedFriend(true); 7641 } 7642 7643 return ND; 7644} 7645 7646void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7647 AdjustDeclIfTemplate(Dcl); 7648 7649 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7650 if (!Fn) { 7651 Diag(DelLoc, diag::err_deleted_non_function); 7652 return; 7653 } 7654 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7655 Diag(DelLoc, diag::err_deleted_decl_not_first); 7656 Diag(Prev->getLocation(), diag::note_previous_declaration); 7657 // If the declaration wasn't the first, we delete the function anyway for 7658 // recovery. 7659 } 7660 Fn->setDeletedAsWritten(); 7661} 7662 7663static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7664 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7665 Stmt *SubStmt = *CI; 7666 if (!SubStmt) 7667 continue; 7668 if (isa<ReturnStmt>(SubStmt)) 7669 Self.Diag(SubStmt->getSourceRange().getBegin(), 7670 diag::err_return_in_constructor_handler); 7671 if (!isa<Expr>(SubStmt)) 7672 SearchForReturnInStmt(Self, SubStmt); 7673 } 7674} 7675 7676void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7677 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7678 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7679 SearchForReturnInStmt(*this, Handler); 7680 } 7681} 7682 7683bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7684 const CXXMethodDecl *Old) { 7685 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7686 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7687 7688 if (Context.hasSameType(NewTy, OldTy) || 7689 NewTy->isDependentType() || OldTy->isDependentType()) 7690 return false; 7691 7692 // Check if the return types are covariant 7693 QualType NewClassTy, OldClassTy; 7694 7695 /// Both types must be pointers or references to classes. 7696 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7697 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7698 NewClassTy = NewPT->getPointeeType(); 7699 OldClassTy = OldPT->getPointeeType(); 7700 } 7701 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7702 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7703 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7704 NewClassTy = NewRT->getPointeeType(); 7705 OldClassTy = OldRT->getPointeeType(); 7706 } 7707 } 7708 } 7709 7710 // The return types aren't either both pointers or references to a class type. 7711 if (NewClassTy.isNull()) { 7712 Diag(New->getLocation(), 7713 diag::err_different_return_type_for_overriding_virtual_function) 7714 << New->getDeclName() << NewTy << OldTy; 7715 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7716 7717 return true; 7718 } 7719 7720 // C++ [class.virtual]p6: 7721 // If the return type of D::f differs from the return type of B::f, the 7722 // class type in the return type of D::f shall be complete at the point of 7723 // declaration of D::f or shall be the class type D. 7724 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7725 if (!RT->isBeingDefined() && 7726 RequireCompleteType(New->getLocation(), NewClassTy, 7727 PDiag(diag::err_covariant_return_incomplete) 7728 << New->getDeclName())) 7729 return true; 7730 } 7731 7732 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7733 // Check if the new class derives from the old class. 7734 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7735 Diag(New->getLocation(), 7736 diag::err_covariant_return_not_derived) 7737 << New->getDeclName() << NewTy << OldTy; 7738 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7739 return true; 7740 } 7741 7742 // Check if we the conversion from derived to base is valid. 7743 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7744 diag::err_covariant_return_inaccessible_base, 7745 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7746 // FIXME: Should this point to the return type? 7747 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7748 // FIXME: this note won't trigger for delayed access control 7749 // diagnostics, and it's impossible to get an undelayed error 7750 // here from access control during the original parse because 7751 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7752 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7753 return true; 7754 } 7755 } 7756 7757 // The qualifiers of the return types must be the same. 7758 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7759 Diag(New->getLocation(), 7760 diag::err_covariant_return_type_different_qualifications) 7761 << New->getDeclName() << NewTy << OldTy; 7762 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7763 return true; 7764 }; 7765 7766 7767 // The new class type must have the same or less qualifiers as the old type. 7768 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7769 Diag(New->getLocation(), 7770 diag::err_covariant_return_type_class_type_more_qualified) 7771 << New->getDeclName() << NewTy << OldTy; 7772 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7773 return true; 7774 }; 7775 7776 return false; 7777} 7778 7779/// \brief Mark the given method pure. 7780/// 7781/// \param Method the method to be marked pure. 7782/// 7783/// \param InitRange the source range that covers the "0" initializer. 7784bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7785 SourceLocation EndLoc = InitRange.getEnd(); 7786 if (EndLoc.isValid()) 7787 Method->setRangeEnd(EndLoc); 7788 7789 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7790 Method->setPure(); 7791 return false; 7792 } 7793 7794 if (!Method->isInvalidDecl()) 7795 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7796 << Method->getDeclName() << InitRange; 7797 return true; 7798} 7799 7800/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7801/// an initializer for the out-of-line declaration 'Dcl'. The scope 7802/// is a fresh scope pushed for just this purpose. 7803/// 7804/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7805/// static data member of class X, names should be looked up in the scope of 7806/// class X. 7807void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7808 // If there is no declaration, there was an error parsing it. 7809 if (D == 0 || D->isInvalidDecl()) return; 7810 7811 // We should only get called for declarations with scope specifiers, like: 7812 // int foo::bar; 7813 assert(D->isOutOfLine()); 7814 EnterDeclaratorContext(S, D->getDeclContext()); 7815} 7816 7817/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7818/// initializer for the out-of-line declaration 'D'. 7819void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7820 // If there is no declaration, there was an error parsing it. 7821 if (D == 0 || D->isInvalidDecl()) return; 7822 7823 assert(D->isOutOfLine()); 7824 ExitDeclaratorContext(S); 7825} 7826 7827/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7828/// C++ if/switch/while/for statement. 7829/// e.g: "if (int x = f()) {...}" 7830DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7831 // C++ 6.4p2: 7832 // The declarator shall not specify a function or an array. 7833 // The type-specifier-seq shall not contain typedef and shall not declare a 7834 // new class or enumeration. 7835 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7836 "Parser allowed 'typedef' as storage class of condition decl."); 7837 7838 TagDecl *OwnedTag = 0; 7839 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7840 QualType Ty = TInfo->getType(); 7841 7842 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7843 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7844 // would be created and CXXConditionDeclExpr wants a VarDecl. 7845 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7846 << D.getSourceRange(); 7847 return DeclResult(); 7848 } else if (OwnedTag && OwnedTag->isDefinition()) { 7849 // The type-specifier-seq shall not declare a new class or enumeration. 7850 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7851 } 7852 7853 Decl *Dcl = ActOnDeclarator(S, D); 7854 if (!Dcl) 7855 return DeclResult(); 7856 7857 return Dcl; 7858} 7859 7860void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7861 bool DefinitionRequired) { 7862 // Ignore any vtable uses in unevaluated operands or for classes that do 7863 // not have a vtable. 7864 if (!Class->isDynamicClass() || Class->isDependentContext() || 7865 CurContext->isDependentContext() || 7866 ExprEvalContexts.back().Context == Unevaluated) 7867 return; 7868 7869 // Try to insert this class into the map. 7870 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7871 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7872 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7873 if (!Pos.second) { 7874 // If we already had an entry, check to see if we are promoting this vtable 7875 // to required a definition. If so, we need to reappend to the VTableUses 7876 // list, since we may have already processed the first entry. 7877 if (DefinitionRequired && !Pos.first->second) { 7878 Pos.first->second = true; 7879 } else { 7880 // Otherwise, we can early exit. 7881 return; 7882 } 7883 } 7884 7885 // Local classes need to have their virtual members marked 7886 // immediately. For all other classes, we mark their virtual members 7887 // at the end of the translation unit. 7888 if (Class->isLocalClass()) 7889 MarkVirtualMembersReferenced(Loc, Class); 7890 else 7891 VTableUses.push_back(std::make_pair(Class, Loc)); 7892} 7893 7894bool Sema::DefineUsedVTables() { 7895 if (VTableUses.empty()) 7896 return false; 7897 7898 // Note: The VTableUses vector could grow as a result of marking 7899 // the members of a class as "used", so we check the size each 7900 // time through the loop and prefer indices (with are stable) to 7901 // iterators (which are not). 7902 bool DefinedAnything = false; 7903 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7904 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7905 if (!Class) 7906 continue; 7907 7908 SourceLocation Loc = VTableUses[I].second; 7909 7910 // If this class has a key function, but that key function is 7911 // defined in another translation unit, we don't need to emit the 7912 // vtable even though we're using it. 7913 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7914 if (KeyFunction && !KeyFunction->hasBody()) { 7915 switch (KeyFunction->getTemplateSpecializationKind()) { 7916 case TSK_Undeclared: 7917 case TSK_ExplicitSpecialization: 7918 case TSK_ExplicitInstantiationDeclaration: 7919 // The key function is in another translation unit. 7920 continue; 7921 7922 case TSK_ExplicitInstantiationDefinition: 7923 case TSK_ImplicitInstantiation: 7924 // We will be instantiating the key function. 7925 break; 7926 } 7927 } else if (!KeyFunction) { 7928 // If we have a class with no key function that is the subject 7929 // of an explicit instantiation declaration, suppress the 7930 // vtable; it will live with the explicit instantiation 7931 // definition. 7932 bool IsExplicitInstantiationDeclaration 7933 = Class->getTemplateSpecializationKind() 7934 == TSK_ExplicitInstantiationDeclaration; 7935 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7936 REnd = Class->redecls_end(); 7937 R != REnd; ++R) { 7938 TemplateSpecializationKind TSK 7939 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7940 if (TSK == TSK_ExplicitInstantiationDeclaration) 7941 IsExplicitInstantiationDeclaration = true; 7942 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7943 IsExplicitInstantiationDeclaration = false; 7944 break; 7945 } 7946 } 7947 7948 if (IsExplicitInstantiationDeclaration) 7949 continue; 7950 } 7951 7952 // Mark all of the virtual members of this class as referenced, so 7953 // that we can build a vtable. Then, tell the AST consumer that a 7954 // vtable for this class is required. 7955 DefinedAnything = true; 7956 MarkVirtualMembersReferenced(Loc, Class); 7957 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7958 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7959 7960 // Optionally warn if we're emitting a weak vtable. 7961 if (Class->getLinkage() == ExternalLinkage && 7962 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7963 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7964 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7965 } 7966 } 7967 VTableUses.clear(); 7968 7969 return DefinedAnything; 7970} 7971 7972void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7973 const CXXRecordDecl *RD) { 7974 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7975 e = RD->method_end(); i != e; ++i) { 7976 CXXMethodDecl *MD = *i; 7977 7978 // C++ [basic.def.odr]p2: 7979 // [...] A virtual member function is used if it is not pure. [...] 7980 if (MD->isVirtual() && !MD->isPure()) 7981 MarkDeclarationReferenced(Loc, MD); 7982 } 7983 7984 // Only classes that have virtual bases need a VTT. 7985 if (RD->getNumVBases() == 0) 7986 return; 7987 7988 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7989 e = RD->bases_end(); i != e; ++i) { 7990 const CXXRecordDecl *Base = 7991 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7992 if (Base->getNumVBases() == 0) 7993 continue; 7994 MarkVirtualMembersReferenced(Loc, Base); 7995 } 7996} 7997 7998/// SetIvarInitializers - This routine builds initialization ASTs for the 7999/// Objective-C implementation whose ivars need be initialized. 8000void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 8001 if (!getLangOptions().CPlusPlus) 8002 return; 8003 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 8004 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 8005 CollectIvarsToConstructOrDestruct(OID, ivars); 8006 if (ivars.empty()) 8007 return; 8008 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 8009 for (unsigned i = 0; i < ivars.size(); i++) { 8010 FieldDecl *Field = ivars[i]; 8011 if (Field->isInvalidDecl()) 8012 continue; 8013 8014 CXXCtorInitializer *Member; 8015 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 8016 InitializationKind InitKind = 8017 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 8018 8019 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 8020 ExprResult MemberInit = 8021 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 8022 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 8023 // Note, MemberInit could actually come back empty if no initialization 8024 // is required (e.g., because it would call a trivial default constructor) 8025 if (!MemberInit.get() || MemberInit.isInvalid()) 8026 continue; 8027 8028 Member = 8029 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 8030 SourceLocation(), 8031 MemberInit.takeAs<Expr>(), 8032 SourceLocation()); 8033 AllToInit.push_back(Member); 8034 8035 // Be sure that the destructor is accessible and is marked as referenced. 8036 if (const RecordType *RecordTy 8037 = Context.getBaseElementType(Field->getType()) 8038 ->getAs<RecordType>()) { 8039 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 8040 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 8041 MarkDeclarationReferenced(Field->getLocation(), Destructor); 8042 CheckDestructorAccess(Field->getLocation(), Destructor, 8043 PDiag(diag::err_access_dtor_ivar) 8044 << Context.getBaseElementType(Field->getType())); 8045 } 8046 } 8047 } 8048 ObjCImplementation->setIvarInitializers(Context, 8049 AllToInit.data(), AllToInit.size()); 8050 } 8051} 8052 8053static 8054void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 8055 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 8056 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 8057 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 8058 Sema &S) { 8059 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8060 CE = Current.end(); 8061 if (Ctor->isInvalidDecl()) 8062 return; 8063 8064 const FunctionDecl *FNTarget = 0; 8065 CXXConstructorDecl *Target; 8066 8067 // We ignore the result here since if we don't have a body, Target will be 8068 // null below. 8069 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 8070 Target 8071= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 8072 8073 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 8074 // Avoid dereferencing a null pointer here. 8075 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 8076 8077 if (!Current.insert(Canonical)) 8078 return; 8079 8080 // We know that beyond here, we aren't chaining into a cycle. 8081 if (!Target || !Target->isDelegatingConstructor() || 8082 Target->isInvalidDecl() || Valid.count(TCanonical)) { 8083 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8084 Valid.insert(*CI); 8085 Current.clear(); 8086 // We've hit a cycle. 8087 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 8088 Current.count(TCanonical)) { 8089 // If we haven't diagnosed this cycle yet, do so now. 8090 if (!Invalid.count(TCanonical)) { 8091 S.Diag((*Ctor->init_begin())->getSourceLocation(), 8092 diag::warn_delegating_ctor_cycle) 8093 << Ctor; 8094 8095 // Don't add a note for a function delegating directo to itself. 8096 if (TCanonical != Canonical) 8097 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 8098 8099 CXXConstructorDecl *C = Target; 8100 while (C->getCanonicalDecl() != Canonical) { 8101 (void)C->getTargetConstructor()->hasBody(FNTarget); 8102 assert(FNTarget && "Ctor cycle through bodiless function"); 8103 8104 C 8105 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8106 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8107 } 8108 } 8109 8110 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8111 Invalid.insert(*CI); 8112 Current.clear(); 8113 } else { 8114 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8115 } 8116} 8117 8118 8119void Sema::CheckDelegatingCtorCycles() { 8120 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8121 8122 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8123 CE = Current.end(); 8124 8125 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8126 I = DelegatingCtorDecls.begin(), 8127 E = DelegatingCtorDecls.end(); 8128 I != E; ++I) { 8129 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8130 } 8131 8132 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8133 (*CI)->setInvalidDecl(); 8134} 8135