SemaDeclCXX.cpp revision 3e4c6c4c79a03f5cb0c4671d7c282d623c6dc35e
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, bool Defaulted) { 967 // FIXME: Do something with this 968 (void) Defaulted; 969 970 const DeclSpec &DS = D.getDeclSpec(); 971 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 972 DeclarationName Name = NameInfo.getName(); 973 SourceLocation Loc = NameInfo.getLoc(); 974 975 // For anonymous bitfields, the location should point to the type. 976 if (Loc.isInvalid()) 977 Loc = D.getSourceRange().getBegin(); 978 979 Expr *BitWidth = static_cast<Expr*>(BW); 980 Expr *Init = static_cast<Expr*>(InitExpr); 981 982 assert(isa<CXXRecordDecl>(CurContext)); 983 assert(!DS.isFriendSpecified()); 984 985 bool isFunc = false; 986 if (D.isFunctionDeclarator()) 987 isFunc = true; 988 else if (D.getNumTypeObjects() == 0 && 989 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 990 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 991 isFunc = TDType->isFunctionType(); 992 } 993 994 // C++ 9.2p6: A member shall not be declared to have automatic storage 995 // duration (auto, register) or with the extern storage-class-specifier. 996 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 997 // data members and cannot be applied to names declared const or static, 998 // and cannot be applied to reference members. 999 switch (DS.getStorageClassSpec()) { 1000 case DeclSpec::SCS_unspecified: 1001 case DeclSpec::SCS_typedef: 1002 case DeclSpec::SCS_static: 1003 // FALL THROUGH. 1004 break; 1005 case DeclSpec::SCS_mutable: 1006 if (isFunc) { 1007 if (DS.getStorageClassSpecLoc().isValid()) 1008 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1009 else 1010 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1011 1012 // FIXME: It would be nicer if the keyword was ignored only for this 1013 // declarator. Otherwise we could get follow-up errors. 1014 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1015 } 1016 break; 1017 default: 1018 if (DS.getStorageClassSpecLoc().isValid()) 1019 Diag(DS.getStorageClassSpecLoc(), 1020 diag::err_storageclass_invalid_for_member); 1021 else 1022 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1023 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1024 } 1025 1026 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1027 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1028 !isFunc); 1029 1030 Decl *Member; 1031 if (isInstField) { 1032 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1033 1034 1035 if (SS.isSet() && !SS.isInvalid()) { 1036 // The user provided a superfluous scope specifier inside a class 1037 // definition: 1038 // 1039 // class X { 1040 // int X::member; 1041 // }; 1042 DeclContext *DC = 0; 1043 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1044 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1045 << Name << FixItHint::CreateRemoval(SS.getRange()); 1046 else 1047 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1048 << Name << SS.getRange(); 1049 1050 SS.clear(); 1051 } 1052 1053 // FIXME: Check for template parameters! 1054 // FIXME: Check that the name is an identifier! 1055 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1056 AS); 1057 assert(Member && "HandleField never returns null"); 1058 } else { 1059 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 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->isThisDeclarationADefinition()) 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 3734 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 3735 NamedDecl *PrevDecl = R.first == R.second? 0 : *R.first; 3736 3737 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3738 // This is an extended namespace definition. 3739 if (Namespc->isInline() != OrigNS->isInline()) { 3740 // inline-ness must match 3741 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3742 << Namespc->isInline(); 3743 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3744 Namespc->setInvalidDecl(); 3745 // Recover by ignoring the new namespace's inline status. 3746 Namespc->setInline(OrigNS->isInline()); 3747 } 3748 3749 // Attach this namespace decl to the chain of extended namespace 3750 // definitions. 3751 OrigNS->setNextNamespace(Namespc); 3752 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3753 3754 // Remove the previous declaration from the scope. 3755 if (DeclRegionScope->isDeclScope(OrigNS)) { 3756 IdResolver.RemoveDecl(OrigNS); 3757 DeclRegionScope->RemoveDecl(OrigNS); 3758 } 3759 } else if (PrevDecl) { 3760 // This is an invalid name redefinition. 3761 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3762 << Namespc->getDeclName(); 3763 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3764 Namespc->setInvalidDecl(); 3765 // Continue on to push Namespc as current DeclContext and return it. 3766 } else if (II->isStr("std") && 3767 CurContext->getRedeclContext()->isTranslationUnit()) { 3768 // This is the first "real" definition of the namespace "std", so update 3769 // our cache of the "std" namespace to point at this definition. 3770 if (NamespaceDecl *StdNS = getStdNamespace()) { 3771 // We had already defined a dummy namespace "std". Link this new 3772 // namespace definition to the dummy namespace "std". 3773 StdNS->setNextNamespace(Namespc); 3774 StdNS->setLocation(IdentLoc); 3775 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3776 } 3777 3778 // Make our StdNamespace cache point at the first real definition of the 3779 // "std" namespace. 3780 StdNamespace = Namespc; 3781 } 3782 3783 PushOnScopeChains(Namespc, DeclRegionScope); 3784 } else { 3785 // Anonymous namespaces. 3786 assert(Namespc->isAnonymousNamespace()); 3787 3788 // Link the anonymous namespace into its parent. 3789 NamespaceDecl *PrevDecl; 3790 DeclContext *Parent = CurContext->getRedeclContext(); 3791 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3792 PrevDecl = TU->getAnonymousNamespace(); 3793 TU->setAnonymousNamespace(Namespc); 3794 } else { 3795 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3796 PrevDecl = ND->getAnonymousNamespace(); 3797 ND->setAnonymousNamespace(Namespc); 3798 } 3799 3800 // Link the anonymous namespace with its previous declaration. 3801 if (PrevDecl) { 3802 assert(PrevDecl->isAnonymousNamespace()); 3803 assert(!PrevDecl->getNextNamespace()); 3804 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3805 PrevDecl->setNextNamespace(Namespc); 3806 3807 if (Namespc->isInline() != PrevDecl->isInline()) { 3808 // inline-ness must match 3809 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3810 << Namespc->isInline(); 3811 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3812 Namespc->setInvalidDecl(); 3813 // Recover by ignoring the new namespace's inline status. 3814 Namespc->setInline(PrevDecl->isInline()); 3815 } 3816 } 3817 3818 CurContext->addDecl(Namespc); 3819 3820 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3821 // behaves as if it were replaced by 3822 // namespace unique { /* empty body */ } 3823 // using namespace unique; 3824 // namespace unique { namespace-body } 3825 // where all occurrences of 'unique' in a translation unit are 3826 // replaced by the same identifier and this identifier differs 3827 // from all other identifiers in the entire program. 3828 3829 // We just create the namespace with an empty name and then add an 3830 // implicit using declaration, just like the standard suggests. 3831 // 3832 // CodeGen enforces the "universally unique" aspect by giving all 3833 // declarations semantically contained within an anonymous 3834 // namespace internal linkage. 3835 3836 if (!PrevDecl) { 3837 UsingDirectiveDecl* UD 3838 = UsingDirectiveDecl::Create(Context, CurContext, 3839 /* 'using' */ LBrace, 3840 /* 'namespace' */ SourceLocation(), 3841 /* qualifier */ NestedNameSpecifierLoc(), 3842 /* identifier */ SourceLocation(), 3843 Namespc, 3844 /* Ancestor */ CurContext); 3845 UD->setImplicit(); 3846 CurContext->addDecl(UD); 3847 } 3848 } 3849 3850 // Although we could have an invalid decl (i.e. the namespace name is a 3851 // redefinition), push it as current DeclContext and try to continue parsing. 3852 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3853 // for the namespace has the declarations that showed up in that particular 3854 // namespace definition. 3855 PushDeclContext(NamespcScope, Namespc); 3856 return Namespc; 3857} 3858 3859/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3860/// is a namespace alias, returns the namespace it points to. 3861static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3862 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3863 return AD->getNamespace(); 3864 return dyn_cast_or_null<NamespaceDecl>(D); 3865} 3866 3867/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3868/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3869void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3870 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3871 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3872 Namespc->setRBraceLoc(RBrace); 3873 PopDeclContext(); 3874 if (Namespc->hasAttr<VisibilityAttr>()) 3875 PopPragmaVisibility(); 3876} 3877 3878CXXRecordDecl *Sema::getStdBadAlloc() const { 3879 return cast_or_null<CXXRecordDecl>( 3880 StdBadAlloc.get(Context.getExternalSource())); 3881} 3882 3883NamespaceDecl *Sema::getStdNamespace() const { 3884 return cast_or_null<NamespaceDecl>( 3885 StdNamespace.get(Context.getExternalSource())); 3886} 3887 3888/// \brief Retrieve the special "std" namespace, which may require us to 3889/// implicitly define the namespace. 3890NamespaceDecl *Sema::getOrCreateStdNamespace() { 3891 if (!StdNamespace) { 3892 // The "std" namespace has not yet been defined, so build one implicitly. 3893 StdNamespace = NamespaceDecl::Create(Context, 3894 Context.getTranslationUnitDecl(), 3895 SourceLocation(), SourceLocation(), 3896 &PP.getIdentifierTable().get("std")); 3897 getStdNamespace()->setImplicit(true); 3898 } 3899 3900 return getStdNamespace(); 3901} 3902 3903/// \brief Determine whether a using statement is in a context where it will be 3904/// apply in all contexts. 3905static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3906 switch (CurContext->getDeclKind()) { 3907 case Decl::TranslationUnit: 3908 return true; 3909 case Decl::LinkageSpec: 3910 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3911 default: 3912 return false; 3913 } 3914} 3915 3916Decl *Sema::ActOnUsingDirective(Scope *S, 3917 SourceLocation UsingLoc, 3918 SourceLocation NamespcLoc, 3919 CXXScopeSpec &SS, 3920 SourceLocation IdentLoc, 3921 IdentifierInfo *NamespcName, 3922 AttributeList *AttrList) { 3923 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3924 assert(NamespcName && "Invalid NamespcName."); 3925 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3926 3927 // This can only happen along a recovery path. 3928 while (S->getFlags() & Scope::TemplateParamScope) 3929 S = S->getParent(); 3930 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3931 3932 UsingDirectiveDecl *UDir = 0; 3933 NestedNameSpecifier *Qualifier = 0; 3934 if (SS.isSet()) 3935 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3936 3937 // Lookup namespace name. 3938 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3939 LookupParsedName(R, S, &SS); 3940 if (R.isAmbiguous()) 3941 return 0; 3942 3943 if (R.empty()) { 3944 // Allow "using namespace std;" or "using namespace ::std;" even if 3945 // "std" hasn't been defined yet, for GCC compatibility. 3946 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3947 NamespcName->isStr("std")) { 3948 Diag(IdentLoc, diag::ext_using_undefined_std); 3949 R.addDecl(getOrCreateStdNamespace()); 3950 R.resolveKind(); 3951 } 3952 // Otherwise, attempt typo correction. 3953 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3954 CTC_NoKeywords, 0)) { 3955 if (R.getAsSingle<NamespaceDecl>() || 3956 R.getAsSingle<NamespaceAliasDecl>()) { 3957 if (DeclContext *DC = computeDeclContext(SS, false)) 3958 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3959 << NamespcName << DC << Corrected << SS.getRange() 3960 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3961 else 3962 Diag(IdentLoc, diag::err_using_directive_suggest) 3963 << NamespcName << Corrected 3964 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3965 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3966 << Corrected; 3967 3968 NamespcName = Corrected.getAsIdentifierInfo(); 3969 } else { 3970 R.clear(); 3971 R.setLookupName(NamespcName); 3972 } 3973 } 3974 } 3975 3976 if (!R.empty()) { 3977 NamedDecl *Named = R.getFoundDecl(); 3978 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3979 && "expected namespace decl"); 3980 // C++ [namespace.udir]p1: 3981 // A using-directive specifies that the names in the nominated 3982 // namespace can be used in the scope in which the 3983 // using-directive appears after the using-directive. During 3984 // unqualified name lookup (3.4.1), the names appear as if they 3985 // were declared in the nearest enclosing namespace which 3986 // contains both the using-directive and the nominated 3987 // namespace. [Note: in this context, "contains" means "contains 3988 // directly or indirectly". ] 3989 3990 // Find enclosing context containing both using-directive and 3991 // nominated namespace. 3992 NamespaceDecl *NS = getNamespaceDecl(Named); 3993 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3994 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3995 CommonAncestor = CommonAncestor->getParent(); 3996 3997 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3998 SS.getWithLocInContext(Context), 3999 IdentLoc, Named, CommonAncestor); 4000 4001 if (IsUsingDirectiveInToplevelContext(CurContext) && 4002 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4003 Diag(IdentLoc, diag::warn_using_directive_in_header); 4004 } 4005 4006 PushUsingDirective(S, UDir); 4007 } else { 4008 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4009 } 4010 4011 // FIXME: We ignore attributes for now. 4012 return UDir; 4013} 4014 4015void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4016 // If scope has associated entity, then using directive is at namespace 4017 // or translation unit scope. We add UsingDirectiveDecls, into 4018 // it's lookup structure. 4019 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4020 Ctx->addDecl(UDir); 4021 else 4022 // Otherwise it is block-sope. using-directives will affect lookup 4023 // only to the end of scope. 4024 S->PushUsingDirective(UDir); 4025} 4026 4027 4028Decl *Sema::ActOnUsingDeclaration(Scope *S, 4029 AccessSpecifier AS, 4030 bool HasUsingKeyword, 4031 SourceLocation UsingLoc, 4032 CXXScopeSpec &SS, 4033 UnqualifiedId &Name, 4034 AttributeList *AttrList, 4035 bool IsTypeName, 4036 SourceLocation TypenameLoc) { 4037 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4038 4039 switch (Name.getKind()) { 4040 case UnqualifiedId::IK_Identifier: 4041 case UnqualifiedId::IK_OperatorFunctionId: 4042 case UnqualifiedId::IK_LiteralOperatorId: 4043 case UnqualifiedId::IK_ConversionFunctionId: 4044 break; 4045 4046 case UnqualifiedId::IK_ConstructorName: 4047 case UnqualifiedId::IK_ConstructorTemplateId: 4048 // C++0x inherited constructors. 4049 if (getLangOptions().CPlusPlus0x) break; 4050 4051 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4052 << SS.getRange(); 4053 return 0; 4054 4055 case UnqualifiedId::IK_DestructorName: 4056 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4057 << SS.getRange(); 4058 return 0; 4059 4060 case UnqualifiedId::IK_TemplateId: 4061 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4062 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4063 return 0; 4064 } 4065 4066 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4067 DeclarationName TargetName = TargetNameInfo.getName(); 4068 if (!TargetName) 4069 return 0; 4070 4071 // Warn about using declarations. 4072 // TODO: store that the declaration was written without 'using' and 4073 // talk about access decls instead of using decls in the 4074 // diagnostics. 4075 if (!HasUsingKeyword) { 4076 UsingLoc = Name.getSourceRange().getBegin(); 4077 4078 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4079 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4080 } 4081 4082 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4083 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4084 return 0; 4085 4086 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4087 TargetNameInfo, AttrList, 4088 /* IsInstantiation */ false, 4089 IsTypeName, TypenameLoc); 4090 if (UD) 4091 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4092 4093 return UD; 4094} 4095 4096/// \brief Determine whether a using declaration considers the given 4097/// declarations as "equivalent", e.g., if they are redeclarations of 4098/// the same entity or are both typedefs of the same type. 4099static bool 4100IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4101 bool &SuppressRedeclaration) { 4102 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4103 SuppressRedeclaration = false; 4104 return true; 4105 } 4106 4107 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4108 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4109 SuppressRedeclaration = true; 4110 return Context.hasSameType(TD1->getUnderlyingType(), 4111 TD2->getUnderlyingType()); 4112 } 4113 4114 return false; 4115} 4116 4117 4118/// Determines whether to create a using shadow decl for a particular 4119/// decl, given the set of decls existing prior to this using lookup. 4120bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4121 const LookupResult &Previous) { 4122 // Diagnose finding a decl which is not from a base class of the 4123 // current class. We do this now because there are cases where this 4124 // function will silently decide not to build a shadow decl, which 4125 // will pre-empt further diagnostics. 4126 // 4127 // We don't need to do this in C++0x because we do the check once on 4128 // the qualifier. 4129 // 4130 // FIXME: diagnose the following if we care enough: 4131 // struct A { int foo; }; 4132 // struct B : A { using A::foo; }; 4133 // template <class T> struct C : A {}; 4134 // template <class T> struct D : C<T> { using B::foo; } // <--- 4135 // This is invalid (during instantiation) in C++03 because B::foo 4136 // resolves to the using decl in B, which is not a base class of D<T>. 4137 // We can't diagnose it immediately because C<T> is an unknown 4138 // specialization. The UsingShadowDecl in D<T> then points directly 4139 // to A::foo, which will look well-formed when we instantiate. 4140 // The right solution is to not collapse the shadow-decl chain. 4141 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4142 DeclContext *OrigDC = Orig->getDeclContext(); 4143 4144 // Handle enums and anonymous structs. 4145 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4146 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4147 while (OrigRec->isAnonymousStructOrUnion()) 4148 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4149 4150 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4151 if (OrigDC == CurContext) { 4152 Diag(Using->getLocation(), 4153 diag::err_using_decl_nested_name_specifier_is_current_class) 4154 << Using->getQualifierLoc().getSourceRange(); 4155 Diag(Orig->getLocation(), diag::note_using_decl_target); 4156 return true; 4157 } 4158 4159 Diag(Using->getQualifierLoc().getBeginLoc(), 4160 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4161 << Using->getQualifier() 4162 << cast<CXXRecordDecl>(CurContext) 4163 << Using->getQualifierLoc().getSourceRange(); 4164 Diag(Orig->getLocation(), diag::note_using_decl_target); 4165 return true; 4166 } 4167 } 4168 4169 if (Previous.empty()) return false; 4170 4171 NamedDecl *Target = Orig; 4172 if (isa<UsingShadowDecl>(Target)) 4173 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4174 4175 // If the target happens to be one of the previous declarations, we 4176 // don't have a conflict. 4177 // 4178 // FIXME: but we might be increasing its access, in which case we 4179 // should redeclare it. 4180 NamedDecl *NonTag = 0, *Tag = 0; 4181 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4182 I != E; ++I) { 4183 NamedDecl *D = (*I)->getUnderlyingDecl(); 4184 bool Result; 4185 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4186 return Result; 4187 4188 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4189 } 4190 4191 if (Target->isFunctionOrFunctionTemplate()) { 4192 FunctionDecl *FD; 4193 if (isa<FunctionTemplateDecl>(Target)) 4194 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4195 else 4196 FD = cast<FunctionDecl>(Target); 4197 4198 NamedDecl *OldDecl = 0; 4199 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4200 case Ovl_Overload: 4201 return false; 4202 4203 case Ovl_NonFunction: 4204 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4205 break; 4206 4207 // We found a decl with the exact signature. 4208 case Ovl_Match: 4209 // If we're in a record, we want to hide the target, so we 4210 // return true (without a diagnostic) to tell the caller not to 4211 // build a shadow decl. 4212 if (CurContext->isRecord()) 4213 return true; 4214 4215 // If we're not in a record, this is an error. 4216 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4217 break; 4218 } 4219 4220 Diag(Target->getLocation(), diag::note_using_decl_target); 4221 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4222 return true; 4223 } 4224 4225 // Target is not a function. 4226 4227 if (isa<TagDecl>(Target)) { 4228 // No conflict between a tag and a non-tag. 4229 if (!Tag) return false; 4230 4231 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4232 Diag(Target->getLocation(), diag::note_using_decl_target); 4233 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4234 return true; 4235 } 4236 4237 // No conflict between a tag and a non-tag. 4238 if (!NonTag) return false; 4239 4240 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4241 Diag(Target->getLocation(), diag::note_using_decl_target); 4242 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4243 return true; 4244} 4245 4246/// Builds a shadow declaration corresponding to a 'using' declaration. 4247UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4248 UsingDecl *UD, 4249 NamedDecl *Orig) { 4250 4251 // If we resolved to another shadow declaration, just coalesce them. 4252 NamedDecl *Target = Orig; 4253 if (isa<UsingShadowDecl>(Target)) { 4254 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4255 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4256 } 4257 4258 UsingShadowDecl *Shadow 4259 = UsingShadowDecl::Create(Context, CurContext, 4260 UD->getLocation(), UD, Target); 4261 UD->addShadowDecl(Shadow); 4262 4263 Shadow->setAccess(UD->getAccess()); 4264 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4265 Shadow->setInvalidDecl(); 4266 4267 if (S) 4268 PushOnScopeChains(Shadow, S); 4269 else 4270 CurContext->addDecl(Shadow); 4271 4272 4273 return Shadow; 4274} 4275 4276/// Hides a using shadow declaration. This is required by the current 4277/// using-decl implementation when a resolvable using declaration in a 4278/// class is followed by a declaration which would hide or override 4279/// one or more of the using decl's targets; for example: 4280/// 4281/// struct Base { void foo(int); }; 4282/// struct Derived : Base { 4283/// using Base::foo; 4284/// void foo(int); 4285/// }; 4286/// 4287/// The governing language is C++03 [namespace.udecl]p12: 4288/// 4289/// When a using-declaration brings names from a base class into a 4290/// derived class scope, member functions in the derived class 4291/// override and/or hide member functions with the same name and 4292/// parameter types in a base class (rather than conflicting). 4293/// 4294/// There are two ways to implement this: 4295/// (1) optimistically create shadow decls when they're not hidden 4296/// by existing declarations, or 4297/// (2) don't create any shadow decls (or at least don't make them 4298/// visible) until we've fully parsed/instantiated the class. 4299/// The problem with (1) is that we might have to retroactively remove 4300/// a shadow decl, which requires several O(n) operations because the 4301/// decl structures are (very reasonably) not designed for removal. 4302/// (2) avoids this but is very fiddly and phase-dependent. 4303void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4304 if (Shadow->getDeclName().getNameKind() == 4305 DeclarationName::CXXConversionFunctionName) 4306 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4307 4308 // Remove it from the DeclContext... 4309 Shadow->getDeclContext()->removeDecl(Shadow); 4310 4311 // ...and the scope, if applicable... 4312 if (S) { 4313 S->RemoveDecl(Shadow); 4314 IdResolver.RemoveDecl(Shadow); 4315 } 4316 4317 // ...and the using decl. 4318 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4319 4320 // TODO: complain somehow if Shadow was used. It shouldn't 4321 // be possible for this to happen, because...? 4322} 4323 4324/// Builds a using declaration. 4325/// 4326/// \param IsInstantiation - Whether this call arises from an 4327/// instantiation of an unresolved using declaration. We treat 4328/// the lookup differently for these declarations. 4329NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4330 SourceLocation UsingLoc, 4331 CXXScopeSpec &SS, 4332 const DeclarationNameInfo &NameInfo, 4333 AttributeList *AttrList, 4334 bool IsInstantiation, 4335 bool IsTypeName, 4336 SourceLocation TypenameLoc) { 4337 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4338 SourceLocation IdentLoc = NameInfo.getLoc(); 4339 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4340 4341 // FIXME: We ignore attributes for now. 4342 4343 if (SS.isEmpty()) { 4344 Diag(IdentLoc, diag::err_using_requires_qualname); 4345 return 0; 4346 } 4347 4348 // Do the redeclaration lookup in the current scope. 4349 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4350 ForRedeclaration); 4351 Previous.setHideTags(false); 4352 if (S) { 4353 LookupName(Previous, S); 4354 4355 // It is really dumb that we have to do this. 4356 LookupResult::Filter F = Previous.makeFilter(); 4357 while (F.hasNext()) { 4358 NamedDecl *D = F.next(); 4359 if (!isDeclInScope(D, CurContext, S)) 4360 F.erase(); 4361 } 4362 F.done(); 4363 } else { 4364 assert(IsInstantiation && "no scope in non-instantiation"); 4365 assert(CurContext->isRecord() && "scope not record in instantiation"); 4366 LookupQualifiedName(Previous, CurContext); 4367 } 4368 4369 // Check for invalid redeclarations. 4370 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4371 return 0; 4372 4373 // Check for bad qualifiers. 4374 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4375 return 0; 4376 4377 DeclContext *LookupContext = computeDeclContext(SS); 4378 NamedDecl *D; 4379 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4380 if (!LookupContext) { 4381 if (IsTypeName) { 4382 // FIXME: not all declaration name kinds are legal here 4383 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4384 UsingLoc, TypenameLoc, 4385 QualifierLoc, 4386 IdentLoc, NameInfo.getName()); 4387 } else { 4388 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4389 QualifierLoc, NameInfo); 4390 } 4391 } else { 4392 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4393 NameInfo, IsTypeName); 4394 } 4395 D->setAccess(AS); 4396 CurContext->addDecl(D); 4397 4398 if (!LookupContext) return D; 4399 UsingDecl *UD = cast<UsingDecl>(D); 4400 4401 if (RequireCompleteDeclContext(SS, LookupContext)) { 4402 UD->setInvalidDecl(); 4403 return UD; 4404 } 4405 4406 // Constructor inheriting using decls get special treatment. 4407 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4408 if (CheckInheritedConstructorUsingDecl(UD)) 4409 UD->setInvalidDecl(); 4410 return UD; 4411 } 4412 4413 // Otherwise, look up the target name. 4414 4415 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4416 4417 // Unlike most lookups, we don't always want to hide tag 4418 // declarations: tag names are visible through the using declaration 4419 // even if hidden by ordinary names, *except* in a dependent context 4420 // where it's important for the sanity of two-phase lookup. 4421 if (!IsInstantiation) 4422 R.setHideTags(false); 4423 4424 LookupQualifiedName(R, LookupContext); 4425 4426 if (R.empty()) { 4427 Diag(IdentLoc, diag::err_no_member) 4428 << NameInfo.getName() << LookupContext << SS.getRange(); 4429 UD->setInvalidDecl(); 4430 return UD; 4431 } 4432 4433 if (R.isAmbiguous()) { 4434 UD->setInvalidDecl(); 4435 return UD; 4436 } 4437 4438 if (IsTypeName) { 4439 // If we asked for a typename and got a non-type decl, error out. 4440 if (!R.getAsSingle<TypeDecl>()) { 4441 Diag(IdentLoc, diag::err_using_typename_non_type); 4442 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4443 Diag((*I)->getUnderlyingDecl()->getLocation(), 4444 diag::note_using_decl_target); 4445 UD->setInvalidDecl(); 4446 return UD; 4447 } 4448 } else { 4449 // If we asked for a non-typename and we got a type, error out, 4450 // but only if this is an instantiation of an unresolved using 4451 // decl. Otherwise just silently find the type name. 4452 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4453 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4454 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4455 UD->setInvalidDecl(); 4456 return UD; 4457 } 4458 } 4459 4460 // C++0x N2914 [namespace.udecl]p6: 4461 // A using-declaration shall not name a namespace. 4462 if (R.getAsSingle<NamespaceDecl>()) { 4463 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4464 << SS.getRange(); 4465 UD->setInvalidDecl(); 4466 return UD; 4467 } 4468 4469 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4470 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4471 BuildUsingShadowDecl(S, UD, *I); 4472 } 4473 4474 return UD; 4475} 4476 4477/// Additional checks for a using declaration referring to a constructor name. 4478bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4479 if (UD->isTypeName()) { 4480 // FIXME: Cannot specify typename when specifying constructor 4481 return true; 4482 } 4483 4484 const Type *SourceType = UD->getQualifier()->getAsType(); 4485 assert(SourceType && 4486 "Using decl naming constructor doesn't have type in scope spec."); 4487 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4488 4489 // Check whether the named type is a direct base class. 4490 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4491 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4492 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4493 BaseIt != BaseE; ++BaseIt) { 4494 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4495 if (CanonicalSourceType == BaseType) 4496 break; 4497 } 4498 4499 if (BaseIt == BaseE) { 4500 // Did not find SourceType in the bases. 4501 Diag(UD->getUsingLocation(), 4502 diag::err_using_decl_constructor_not_in_direct_base) 4503 << UD->getNameInfo().getSourceRange() 4504 << QualType(SourceType, 0) << TargetClass; 4505 return true; 4506 } 4507 4508 BaseIt->setInheritConstructors(); 4509 4510 return false; 4511} 4512 4513/// Checks that the given using declaration is not an invalid 4514/// redeclaration. Note that this is checking only for the using decl 4515/// itself, not for any ill-formedness among the UsingShadowDecls. 4516bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4517 bool isTypeName, 4518 const CXXScopeSpec &SS, 4519 SourceLocation NameLoc, 4520 const LookupResult &Prev) { 4521 // C++03 [namespace.udecl]p8: 4522 // C++0x [namespace.udecl]p10: 4523 // A using-declaration is a declaration and can therefore be used 4524 // repeatedly where (and only where) multiple declarations are 4525 // allowed. 4526 // 4527 // That's in non-member contexts. 4528 if (!CurContext->getRedeclContext()->isRecord()) 4529 return false; 4530 4531 NestedNameSpecifier *Qual 4532 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4533 4534 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4535 NamedDecl *D = *I; 4536 4537 bool DTypename; 4538 NestedNameSpecifier *DQual; 4539 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4540 DTypename = UD->isTypeName(); 4541 DQual = UD->getQualifier(); 4542 } else if (UnresolvedUsingValueDecl *UD 4543 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4544 DTypename = false; 4545 DQual = UD->getQualifier(); 4546 } else if (UnresolvedUsingTypenameDecl *UD 4547 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4548 DTypename = true; 4549 DQual = UD->getQualifier(); 4550 } else continue; 4551 4552 // using decls differ if one says 'typename' and the other doesn't. 4553 // FIXME: non-dependent using decls? 4554 if (isTypeName != DTypename) continue; 4555 4556 // using decls differ if they name different scopes (but note that 4557 // template instantiation can cause this check to trigger when it 4558 // didn't before instantiation). 4559 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4560 Context.getCanonicalNestedNameSpecifier(DQual)) 4561 continue; 4562 4563 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4564 Diag(D->getLocation(), diag::note_using_decl) << 1; 4565 return true; 4566 } 4567 4568 return false; 4569} 4570 4571 4572/// Checks that the given nested-name qualifier used in a using decl 4573/// in the current context is appropriately related to the current 4574/// scope. If an error is found, diagnoses it and returns true. 4575bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4576 const CXXScopeSpec &SS, 4577 SourceLocation NameLoc) { 4578 DeclContext *NamedContext = computeDeclContext(SS); 4579 4580 if (!CurContext->isRecord()) { 4581 // C++03 [namespace.udecl]p3: 4582 // C++0x [namespace.udecl]p8: 4583 // A using-declaration for a class member shall be a member-declaration. 4584 4585 // If we weren't able to compute a valid scope, it must be a 4586 // dependent class scope. 4587 if (!NamedContext || NamedContext->isRecord()) { 4588 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4589 << SS.getRange(); 4590 return true; 4591 } 4592 4593 // Otherwise, everything is known to be fine. 4594 return false; 4595 } 4596 4597 // The current scope is a record. 4598 4599 // If the named context is dependent, we can't decide much. 4600 if (!NamedContext) { 4601 // FIXME: in C++0x, we can diagnose if we can prove that the 4602 // nested-name-specifier does not refer to a base class, which is 4603 // still possible in some cases. 4604 4605 // Otherwise we have to conservatively report that things might be 4606 // okay. 4607 return false; 4608 } 4609 4610 if (!NamedContext->isRecord()) { 4611 // Ideally this would point at the last name in the specifier, 4612 // but we don't have that level of source info. 4613 Diag(SS.getRange().getBegin(), 4614 diag::err_using_decl_nested_name_specifier_is_not_class) 4615 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4616 return true; 4617 } 4618 4619 if (!NamedContext->isDependentContext() && 4620 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4621 return true; 4622 4623 if (getLangOptions().CPlusPlus0x) { 4624 // C++0x [namespace.udecl]p3: 4625 // In a using-declaration used as a member-declaration, the 4626 // nested-name-specifier shall name a base class of the class 4627 // being defined. 4628 4629 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4630 cast<CXXRecordDecl>(NamedContext))) { 4631 if (CurContext == NamedContext) { 4632 Diag(NameLoc, 4633 diag::err_using_decl_nested_name_specifier_is_current_class) 4634 << SS.getRange(); 4635 return true; 4636 } 4637 4638 Diag(SS.getRange().getBegin(), 4639 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4640 << (NestedNameSpecifier*) SS.getScopeRep() 4641 << cast<CXXRecordDecl>(CurContext) 4642 << SS.getRange(); 4643 return true; 4644 } 4645 4646 return false; 4647 } 4648 4649 // C++03 [namespace.udecl]p4: 4650 // A using-declaration used as a member-declaration shall refer 4651 // to a member of a base class of the class being defined [etc.]. 4652 4653 // Salient point: SS doesn't have to name a base class as long as 4654 // lookup only finds members from base classes. Therefore we can 4655 // diagnose here only if we can prove that that can't happen, 4656 // i.e. if the class hierarchies provably don't intersect. 4657 4658 // TODO: it would be nice if "definitely valid" results were cached 4659 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4660 // need to be repeated. 4661 4662 struct UserData { 4663 llvm::DenseSet<const CXXRecordDecl*> Bases; 4664 4665 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4666 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4667 Data->Bases.insert(Base); 4668 return true; 4669 } 4670 4671 bool hasDependentBases(const CXXRecordDecl *Class) { 4672 return !Class->forallBases(collect, this); 4673 } 4674 4675 /// Returns true if the base is dependent or is one of the 4676 /// accumulated base classes. 4677 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4678 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4679 return !Data->Bases.count(Base); 4680 } 4681 4682 bool mightShareBases(const CXXRecordDecl *Class) { 4683 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4684 } 4685 }; 4686 4687 UserData Data; 4688 4689 // Returns false if we find a dependent base. 4690 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4691 return false; 4692 4693 // Returns false if the class has a dependent base or if it or one 4694 // of its bases is present in the base set of the current context. 4695 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4696 return false; 4697 4698 Diag(SS.getRange().getBegin(), 4699 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4700 << (NestedNameSpecifier*) SS.getScopeRep() 4701 << cast<CXXRecordDecl>(CurContext) 4702 << SS.getRange(); 4703 4704 return true; 4705} 4706 4707Decl *Sema::ActOnAliasDeclaration(Scope *S, 4708 AccessSpecifier AS, 4709 MultiTemplateParamsArg TemplateParamLists, 4710 SourceLocation UsingLoc, 4711 UnqualifiedId &Name, 4712 TypeResult Type) { 4713 // Skip up to the relevant declaration scope. 4714 while (S->getFlags() & Scope::TemplateParamScope) 4715 S = S->getParent(); 4716 assert((S->getFlags() & Scope::DeclScope) && 4717 "got alias-declaration outside of declaration scope"); 4718 4719 if (Type.isInvalid()) 4720 return 0; 4721 4722 bool Invalid = false; 4723 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4724 TypeSourceInfo *TInfo = 0; 4725 GetTypeFromParser(Type.get(), &TInfo); 4726 4727 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4728 return 0; 4729 4730 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4731 UPPC_DeclarationType)) { 4732 Invalid = true; 4733 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 4734 TInfo->getTypeLoc().getBeginLoc()); 4735 } 4736 4737 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4738 LookupName(Previous, S); 4739 4740 // Warn about shadowing the name of a template parameter. 4741 if (Previous.isSingleResult() && 4742 Previous.getFoundDecl()->isTemplateParameter()) { 4743 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4744 Previous.getFoundDecl())) 4745 Invalid = true; 4746 Previous.clear(); 4747 } 4748 4749 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4750 "name in alias declaration must be an identifier"); 4751 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4752 Name.StartLocation, 4753 Name.Identifier, TInfo); 4754 4755 NewTD->setAccess(AS); 4756 4757 if (Invalid) 4758 NewTD->setInvalidDecl(); 4759 4760 CheckTypedefForVariablyModifiedType(S, NewTD); 4761 Invalid |= NewTD->isInvalidDecl(); 4762 4763 bool Redeclaration = false; 4764 4765 NamedDecl *NewND; 4766 if (TemplateParamLists.size()) { 4767 TypeAliasTemplateDecl *OldDecl = 0; 4768 TemplateParameterList *OldTemplateParams = 0; 4769 4770 if (TemplateParamLists.size() != 1) { 4771 Diag(UsingLoc, diag::err_alias_template_extra_headers) 4772 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 4773 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 4774 } 4775 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 4776 4777 // Only consider previous declarations in the same scope. 4778 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 4779 /*ExplicitInstantiationOrSpecialization*/false); 4780 if (!Previous.empty()) { 4781 Redeclaration = true; 4782 4783 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 4784 if (!OldDecl && !Invalid) { 4785 Diag(UsingLoc, diag::err_redefinition_different_kind) 4786 << Name.Identifier; 4787 4788 NamedDecl *OldD = Previous.getRepresentativeDecl(); 4789 if (OldD->getLocation().isValid()) 4790 Diag(OldD->getLocation(), diag::note_previous_definition); 4791 4792 Invalid = true; 4793 } 4794 4795 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 4796 if (TemplateParameterListsAreEqual(TemplateParams, 4797 OldDecl->getTemplateParameters(), 4798 /*Complain=*/true, 4799 TPL_TemplateMatch)) 4800 OldTemplateParams = OldDecl->getTemplateParameters(); 4801 else 4802 Invalid = true; 4803 4804 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 4805 if (!Invalid && 4806 !Context.hasSameType(OldTD->getUnderlyingType(), 4807 NewTD->getUnderlyingType())) { 4808 // FIXME: The C++0x standard does not clearly say this is ill-formed, 4809 // but we can't reasonably accept it. 4810 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 4811 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 4812 if (OldTD->getLocation().isValid()) 4813 Diag(OldTD->getLocation(), diag::note_previous_definition); 4814 Invalid = true; 4815 } 4816 } 4817 } 4818 4819 // Merge any previous default template arguments into our parameters, 4820 // and check the parameter list. 4821 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 4822 TPC_TypeAliasTemplate)) 4823 return 0; 4824 4825 TypeAliasTemplateDecl *NewDecl = 4826 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 4827 Name.Identifier, TemplateParams, 4828 NewTD); 4829 4830 NewDecl->setAccess(AS); 4831 4832 if (Invalid) 4833 NewDecl->setInvalidDecl(); 4834 else if (OldDecl) 4835 NewDecl->setPreviousDeclaration(OldDecl); 4836 4837 NewND = NewDecl; 4838 } else { 4839 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4840 NewND = NewTD; 4841 } 4842 4843 if (!Redeclaration) 4844 PushOnScopeChains(NewND, S); 4845 4846 return NewND; 4847} 4848 4849Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4850 SourceLocation NamespaceLoc, 4851 SourceLocation AliasLoc, 4852 IdentifierInfo *Alias, 4853 CXXScopeSpec &SS, 4854 SourceLocation IdentLoc, 4855 IdentifierInfo *Ident) { 4856 4857 // Lookup the namespace name. 4858 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4859 LookupParsedName(R, S, &SS); 4860 4861 // Check if we have a previous declaration with the same name. 4862 NamedDecl *PrevDecl 4863 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4864 ForRedeclaration); 4865 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4866 PrevDecl = 0; 4867 4868 if (PrevDecl) { 4869 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4870 // We already have an alias with the same name that points to the same 4871 // namespace, so don't create a new one. 4872 // FIXME: At some point, we'll want to create the (redundant) 4873 // declaration to maintain better source information. 4874 if (!R.isAmbiguous() && !R.empty() && 4875 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4876 return 0; 4877 } 4878 4879 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4880 diag::err_redefinition_different_kind; 4881 Diag(AliasLoc, DiagID) << Alias; 4882 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4883 return 0; 4884 } 4885 4886 if (R.isAmbiguous()) 4887 return 0; 4888 4889 if (R.empty()) { 4890 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4891 CTC_NoKeywords, 0)) { 4892 if (R.getAsSingle<NamespaceDecl>() || 4893 R.getAsSingle<NamespaceAliasDecl>()) { 4894 if (DeclContext *DC = computeDeclContext(SS, false)) 4895 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4896 << Ident << DC << Corrected << SS.getRange() 4897 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4898 else 4899 Diag(IdentLoc, diag::err_using_directive_suggest) 4900 << Ident << Corrected 4901 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4902 4903 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4904 << Corrected; 4905 4906 Ident = Corrected.getAsIdentifierInfo(); 4907 } else { 4908 R.clear(); 4909 R.setLookupName(Ident); 4910 } 4911 } 4912 4913 if (R.empty()) { 4914 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4915 return 0; 4916 } 4917 } 4918 4919 NamespaceAliasDecl *AliasDecl = 4920 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4921 Alias, SS.getWithLocInContext(Context), 4922 IdentLoc, R.getFoundDecl()); 4923 4924 PushOnScopeChains(AliasDecl, S); 4925 return AliasDecl; 4926} 4927 4928namespace { 4929 /// \brief Scoped object used to handle the state changes required in Sema 4930 /// to implicitly define the body of a C++ member function; 4931 class ImplicitlyDefinedFunctionScope { 4932 Sema &S; 4933 Sema::ContextRAII SavedContext; 4934 4935 public: 4936 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4937 : S(S), SavedContext(S, Method) 4938 { 4939 S.PushFunctionScope(); 4940 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4941 } 4942 4943 ~ImplicitlyDefinedFunctionScope() { 4944 S.PopExpressionEvaluationContext(); 4945 S.PopFunctionOrBlockScope(); 4946 } 4947 }; 4948} 4949 4950static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4951 CXXRecordDecl *D) { 4952 ASTContext &Context = Self.Context; 4953 QualType ClassType = Context.getTypeDeclType(D); 4954 DeclarationName ConstructorName 4955 = Context.DeclarationNames.getCXXConstructorName( 4956 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4957 4958 DeclContext::lookup_const_iterator Con, ConEnd; 4959 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4960 Con != ConEnd; ++Con) { 4961 // FIXME: In C++0x, a constructor template can be a default constructor. 4962 if (isa<FunctionTemplateDecl>(*Con)) 4963 continue; 4964 4965 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4966 if (Constructor->isDefaultConstructor()) 4967 return Constructor; 4968 } 4969 return 0; 4970} 4971 4972CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4973 CXXRecordDecl *ClassDecl) { 4974 // C++ [class.ctor]p5: 4975 // A default constructor for a class X is a constructor of class X 4976 // that can be called without an argument. If there is no 4977 // user-declared constructor for class X, a default constructor is 4978 // implicitly declared. An implicitly-declared default constructor 4979 // is an inline public member of its class. 4980 assert(!ClassDecl->hasUserDeclaredConstructor() && 4981 "Should not build implicit default constructor!"); 4982 4983 // C++ [except.spec]p14: 4984 // An implicitly declared special member function (Clause 12) shall have an 4985 // exception-specification. [...] 4986 ImplicitExceptionSpecification ExceptSpec(Context); 4987 4988 // Direct base-class constructors. 4989 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4990 BEnd = ClassDecl->bases_end(); 4991 B != BEnd; ++B) { 4992 if (B->isVirtual()) // Handled below. 4993 continue; 4994 4995 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4996 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4997 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4998 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4999 else if (CXXConstructorDecl *Constructor 5000 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5001 ExceptSpec.CalledDecl(Constructor); 5002 } 5003 } 5004 5005 // Virtual base-class constructors. 5006 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5007 BEnd = ClassDecl->vbases_end(); 5008 B != BEnd; ++B) { 5009 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5010 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5011 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 5012 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5013 else if (CXXConstructorDecl *Constructor 5014 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5015 ExceptSpec.CalledDecl(Constructor); 5016 } 5017 } 5018 5019 // Field constructors. 5020 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5021 FEnd = ClassDecl->field_end(); 5022 F != FEnd; ++F) { 5023 if (const RecordType *RecordTy 5024 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5025 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5026 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 5027 ExceptSpec.CalledDecl( 5028 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5029 else if (CXXConstructorDecl *Constructor 5030 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5031 ExceptSpec.CalledDecl(Constructor); 5032 } 5033 } 5034 5035 FunctionProtoType::ExtProtoInfo EPI; 5036 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5037 EPI.NumExceptions = ExceptSpec.size(); 5038 EPI.Exceptions = ExceptSpec.data(); 5039 5040 // Create the actual constructor declaration. 5041 CanQualType ClassType 5042 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5043 SourceLocation ClassLoc = ClassDecl->getLocation(); 5044 DeclarationName Name 5045 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5046 DeclarationNameInfo NameInfo(Name, ClassLoc); 5047 CXXConstructorDecl *DefaultCon 5048 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5049 Context.getFunctionType(Context.VoidTy, 5050 0, 0, EPI), 5051 /*TInfo=*/0, 5052 /*isExplicit=*/false, 5053 /*isInline=*/true, 5054 /*isImplicitlyDeclared=*/true, 5055 /*isExplicitlyDefaulted=*/false); 5056 DefaultCon->setAccess(AS_public); 5057 DefaultCon->setImplicit(); 5058 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 5059 5060 // Note that we have declared this constructor. 5061 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5062 5063 if (Scope *S = getScopeForContext(ClassDecl)) 5064 PushOnScopeChains(DefaultCon, S, false); 5065 ClassDecl->addDecl(DefaultCon); 5066 5067 return DefaultCon; 5068} 5069 5070void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5071 CXXConstructorDecl *Constructor) { 5072 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 5073 !Constructor->isUsed(false)) && 5074 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5075 5076 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5077 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5078 5079 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5080 DiagnosticErrorTrap Trap(Diags); 5081 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5082 Trap.hasErrorOccurred()) { 5083 Diag(CurrentLocation, diag::note_member_synthesized_at) 5084 << CXXConstructor << Context.getTagDeclType(ClassDecl); 5085 Constructor->setInvalidDecl(); 5086 return; 5087 } 5088 5089 SourceLocation Loc = Constructor->getLocation(); 5090 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5091 5092 Constructor->setUsed(); 5093 MarkVTableUsed(CurrentLocation, ClassDecl); 5094 5095 if (ASTMutationListener *L = getASTMutationListener()) { 5096 L->CompletedImplicitDefinition(Constructor); 5097 } 5098} 5099 5100void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5101 // We start with an initial pass over the base classes to collect those that 5102 // inherit constructors from. If there are none, we can forgo all further 5103 // processing. 5104 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5105 BasesVector BasesToInheritFrom; 5106 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5107 BaseE = ClassDecl->bases_end(); 5108 BaseIt != BaseE; ++BaseIt) { 5109 if (BaseIt->getInheritConstructors()) { 5110 QualType Base = BaseIt->getType(); 5111 if (Base->isDependentType()) { 5112 // If we inherit constructors from anything that is dependent, just 5113 // abort processing altogether. We'll get another chance for the 5114 // instantiations. 5115 return; 5116 } 5117 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5118 } 5119 } 5120 if (BasesToInheritFrom.empty()) 5121 return; 5122 5123 // Now collect the constructors that we already have in the current class. 5124 // Those take precedence over inherited constructors. 5125 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5126 // unless there is a user-declared constructor with the same signature in 5127 // the class where the using-declaration appears. 5128 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5129 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5130 CtorE = ClassDecl->ctor_end(); 5131 CtorIt != CtorE; ++CtorIt) { 5132 ExistingConstructors.insert( 5133 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5134 } 5135 5136 Scope *S = getScopeForContext(ClassDecl); 5137 DeclarationName CreatedCtorName = 5138 Context.DeclarationNames.getCXXConstructorName( 5139 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5140 5141 // Now comes the true work. 5142 // First, we keep a map from constructor types to the base that introduced 5143 // them. Needed for finding conflicting constructors. We also keep the 5144 // actually inserted declarations in there, for pretty diagnostics. 5145 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5146 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5147 ConstructorToSourceMap InheritedConstructors; 5148 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5149 BaseE = BasesToInheritFrom.end(); 5150 BaseIt != BaseE; ++BaseIt) { 5151 const RecordType *Base = *BaseIt; 5152 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5153 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5154 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5155 CtorE = BaseDecl->ctor_end(); 5156 CtorIt != CtorE; ++CtorIt) { 5157 // Find the using declaration for inheriting this base's constructors. 5158 DeclarationName Name = 5159 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5160 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5161 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5162 SourceLocation UsingLoc = UD ? UD->getLocation() : 5163 ClassDecl->getLocation(); 5164 5165 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5166 // from the class X named in the using-declaration consists of actual 5167 // constructors and notional constructors that result from the 5168 // transformation of defaulted parameters as follows: 5169 // - all non-template default constructors of X, and 5170 // - for each non-template constructor of X that has at least one 5171 // parameter with a default argument, the set of constructors that 5172 // results from omitting any ellipsis parameter specification and 5173 // successively omitting parameters with a default argument from the 5174 // end of the parameter-type-list. 5175 CXXConstructorDecl *BaseCtor = *CtorIt; 5176 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5177 const FunctionProtoType *BaseCtorType = 5178 BaseCtor->getType()->getAs<FunctionProtoType>(); 5179 5180 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5181 maxParams = BaseCtor->getNumParams(); 5182 params <= maxParams; ++params) { 5183 // Skip default constructors. They're never inherited. 5184 if (params == 0) 5185 continue; 5186 // Skip copy and move constructors for the same reason. 5187 if (CanBeCopyOrMove && params == 1) 5188 continue; 5189 5190 // Build up a function type for this particular constructor. 5191 // FIXME: The working paper does not consider that the exception spec 5192 // for the inheriting constructor might be larger than that of the 5193 // source. This code doesn't yet, either. 5194 const Type *NewCtorType; 5195 if (params == maxParams) 5196 NewCtorType = BaseCtorType; 5197 else { 5198 llvm::SmallVector<QualType, 16> Args; 5199 for (unsigned i = 0; i < params; ++i) { 5200 Args.push_back(BaseCtorType->getArgType(i)); 5201 } 5202 FunctionProtoType::ExtProtoInfo ExtInfo = 5203 BaseCtorType->getExtProtoInfo(); 5204 ExtInfo.Variadic = false; 5205 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5206 Args.data(), params, ExtInfo) 5207 .getTypePtr(); 5208 } 5209 const Type *CanonicalNewCtorType = 5210 Context.getCanonicalType(NewCtorType); 5211 5212 // Now that we have the type, first check if the class already has a 5213 // constructor with this signature. 5214 if (ExistingConstructors.count(CanonicalNewCtorType)) 5215 continue; 5216 5217 // Then we check if we have already declared an inherited constructor 5218 // with this signature. 5219 std::pair<ConstructorToSourceMap::iterator, bool> result = 5220 InheritedConstructors.insert(std::make_pair( 5221 CanonicalNewCtorType, 5222 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5223 if (!result.second) { 5224 // Already in the map. If it came from a different class, that's an 5225 // error. Not if it's from the same. 5226 CanQualType PreviousBase = result.first->second.first; 5227 if (CanonicalBase != PreviousBase) { 5228 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5229 const CXXConstructorDecl *PrevBaseCtor = 5230 PrevCtor->getInheritedConstructor(); 5231 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5232 5233 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5234 Diag(BaseCtor->getLocation(), 5235 diag::note_using_decl_constructor_conflict_current_ctor); 5236 Diag(PrevBaseCtor->getLocation(), 5237 diag::note_using_decl_constructor_conflict_previous_ctor); 5238 Diag(PrevCtor->getLocation(), 5239 diag::note_using_decl_constructor_conflict_previous_using); 5240 } 5241 continue; 5242 } 5243 5244 // OK, we're there, now add the constructor. 5245 // C++0x [class.inhctor]p8: [...] that would be performed by a 5246 // user-writtern inline constructor [...] 5247 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5248 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5249 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5250 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5251 /*ImplicitlyDeclared=*/true, 5252 /*isExplicitlyDefaulted*/false); 5253 NewCtor->setAccess(BaseCtor->getAccess()); 5254 5255 // Build up the parameter decls and add them. 5256 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5257 for (unsigned i = 0; i < params; ++i) { 5258 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5259 UsingLoc, UsingLoc, 5260 /*IdentifierInfo=*/0, 5261 BaseCtorType->getArgType(i), 5262 /*TInfo=*/0, SC_None, 5263 SC_None, /*DefaultArg=*/0)); 5264 } 5265 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5266 NewCtor->setInheritedConstructor(BaseCtor); 5267 5268 PushOnScopeChains(NewCtor, S, false); 5269 ClassDecl->addDecl(NewCtor); 5270 result.first->second.second = NewCtor; 5271 } 5272 } 5273 } 5274} 5275 5276CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5277 // C++ [class.dtor]p2: 5278 // If a class has no user-declared destructor, a destructor is 5279 // declared implicitly. An implicitly-declared destructor is an 5280 // inline public member of its class. 5281 5282 // C++ [except.spec]p14: 5283 // An implicitly declared special member function (Clause 12) shall have 5284 // an exception-specification. 5285 ImplicitExceptionSpecification ExceptSpec(Context); 5286 5287 // Direct base-class destructors. 5288 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5289 BEnd = ClassDecl->bases_end(); 5290 B != BEnd; ++B) { 5291 if (B->isVirtual()) // Handled below. 5292 continue; 5293 5294 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5295 ExceptSpec.CalledDecl( 5296 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5297 } 5298 5299 // Virtual base-class destructors. 5300 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5301 BEnd = ClassDecl->vbases_end(); 5302 B != BEnd; ++B) { 5303 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5304 ExceptSpec.CalledDecl( 5305 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5306 } 5307 5308 // Field destructors. 5309 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5310 FEnd = ClassDecl->field_end(); 5311 F != FEnd; ++F) { 5312 if (const RecordType *RecordTy 5313 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5314 ExceptSpec.CalledDecl( 5315 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5316 } 5317 5318 // Create the actual destructor declaration. 5319 FunctionProtoType::ExtProtoInfo EPI; 5320 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5321 EPI.NumExceptions = ExceptSpec.size(); 5322 EPI.Exceptions = ExceptSpec.data(); 5323 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5324 5325 CanQualType ClassType 5326 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5327 SourceLocation ClassLoc = ClassDecl->getLocation(); 5328 DeclarationName Name 5329 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5330 DeclarationNameInfo NameInfo(Name, ClassLoc); 5331 CXXDestructorDecl *Destructor 5332 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5333 /*isInline=*/true, 5334 /*isImplicitlyDeclared=*/true); 5335 Destructor->setAccess(AS_public); 5336 Destructor->setImplicit(); 5337 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5338 5339 // Note that we have declared this destructor. 5340 ++ASTContext::NumImplicitDestructorsDeclared; 5341 5342 // Introduce this destructor into its scope. 5343 if (Scope *S = getScopeForContext(ClassDecl)) 5344 PushOnScopeChains(Destructor, S, false); 5345 ClassDecl->addDecl(Destructor); 5346 5347 // This could be uniqued if it ever proves significant. 5348 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5349 5350 AddOverriddenMethods(ClassDecl, Destructor); 5351 5352 return Destructor; 5353} 5354 5355void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5356 CXXDestructorDecl *Destructor) { 5357 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5358 "DefineImplicitDestructor - call it for implicit default dtor"); 5359 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5360 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5361 5362 if (Destructor->isInvalidDecl()) 5363 return; 5364 5365 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5366 5367 DiagnosticErrorTrap Trap(Diags); 5368 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5369 Destructor->getParent()); 5370 5371 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5372 Diag(CurrentLocation, diag::note_member_synthesized_at) 5373 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5374 5375 Destructor->setInvalidDecl(); 5376 return; 5377 } 5378 5379 SourceLocation Loc = Destructor->getLocation(); 5380 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5381 5382 Destructor->setUsed(); 5383 MarkVTableUsed(CurrentLocation, ClassDecl); 5384 5385 if (ASTMutationListener *L = getASTMutationListener()) { 5386 L->CompletedImplicitDefinition(Destructor); 5387 } 5388} 5389 5390/// \brief Builds a statement that copies the given entity from \p From to 5391/// \c To. 5392/// 5393/// This routine is used to copy the members of a class with an 5394/// implicitly-declared copy assignment operator. When the entities being 5395/// copied are arrays, this routine builds for loops to copy them. 5396/// 5397/// \param S The Sema object used for type-checking. 5398/// 5399/// \param Loc The location where the implicit copy is being generated. 5400/// 5401/// \param T The type of the expressions being copied. Both expressions must 5402/// have this type. 5403/// 5404/// \param To The expression we are copying to. 5405/// 5406/// \param From The expression we are copying from. 5407/// 5408/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5409/// Otherwise, it's a non-static member subobject. 5410/// 5411/// \param Depth Internal parameter recording the depth of the recursion. 5412/// 5413/// \returns A statement or a loop that copies the expressions. 5414static StmtResult 5415BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5416 Expr *To, Expr *From, 5417 bool CopyingBaseSubobject, unsigned Depth = 0) { 5418 // C++0x [class.copy]p30: 5419 // Each subobject is assigned in the manner appropriate to its type: 5420 // 5421 // - if the subobject is of class type, the copy assignment operator 5422 // for the class is used (as if by explicit qualification; that is, 5423 // ignoring any possible virtual overriding functions in more derived 5424 // classes); 5425 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5426 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5427 5428 // Look for operator=. 5429 DeclarationName Name 5430 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5431 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5432 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5433 5434 // Filter out any result that isn't a copy-assignment operator. 5435 LookupResult::Filter F = OpLookup.makeFilter(); 5436 while (F.hasNext()) { 5437 NamedDecl *D = F.next(); 5438 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5439 if (Method->isCopyAssignmentOperator()) 5440 continue; 5441 5442 F.erase(); 5443 } 5444 F.done(); 5445 5446 // Suppress the protected check (C++ [class.protected]) for each of the 5447 // assignment operators we found. This strange dance is required when 5448 // we're assigning via a base classes's copy-assignment operator. To 5449 // ensure that we're getting the right base class subobject (without 5450 // ambiguities), we need to cast "this" to that subobject type; to 5451 // ensure that we don't go through the virtual call mechanism, we need 5452 // to qualify the operator= name with the base class (see below). However, 5453 // this means that if the base class has a protected copy assignment 5454 // operator, the protected member access check will fail. So, we 5455 // rewrite "protected" access to "public" access in this case, since we 5456 // know by construction that we're calling from a derived class. 5457 if (CopyingBaseSubobject) { 5458 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5459 L != LEnd; ++L) { 5460 if (L.getAccess() == AS_protected) 5461 L.setAccess(AS_public); 5462 } 5463 } 5464 5465 // Create the nested-name-specifier that will be used to qualify the 5466 // reference to operator=; this is required to suppress the virtual 5467 // call mechanism. 5468 CXXScopeSpec SS; 5469 SS.MakeTrivial(S.Context, 5470 NestedNameSpecifier::Create(S.Context, 0, false, 5471 T.getTypePtr()), 5472 Loc); 5473 5474 // Create the reference to operator=. 5475 ExprResult OpEqualRef 5476 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5477 /*FirstQualifierInScope=*/0, OpLookup, 5478 /*TemplateArgs=*/0, 5479 /*SuppressQualifierCheck=*/true); 5480 if (OpEqualRef.isInvalid()) 5481 return StmtError(); 5482 5483 // Build the call to the assignment operator. 5484 5485 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5486 OpEqualRef.takeAs<Expr>(), 5487 Loc, &From, 1, Loc); 5488 if (Call.isInvalid()) 5489 return StmtError(); 5490 5491 return S.Owned(Call.takeAs<Stmt>()); 5492 } 5493 5494 // - if the subobject is of scalar type, the built-in assignment 5495 // operator is used. 5496 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5497 if (!ArrayTy) { 5498 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5499 if (Assignment.isInvalid()) 5500 return StmtError(); 5501 5502 return S.Owned(Assignment.takeAs<Stmt>()); 5503 } 5504 5505 // - if the subobject is an array, each element is assigned, in the 5506 // manner appropriate to the element type; 5507 5508 // Construct a loop over the array bounds, e.g., 5509 // 5510 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5511 // 5512 // that will copy each of the array elements. 5513 QualType SizeType = S.Context.getSizeType(); 5514 5515 // Create the iteration variable. 5516 IdentifierInfo *IterationVarName = 0; 5517 { 5518 llvm::SmallString<8> Str; 5519 llvm::raw_svector_ostream OS(Str); 5520 OS << "__i" << Depth; 5521 IterationVarName = &S.Context.Idents.get(OS.str()); 5522 } 5523 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5524 IterationVarName, SizeType, 5525 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5526 SC_None, SC_None); 5527 5528 // Initialize the iteration variable to zero. 5529 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5530 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5531 5532 // Create a reference to the iteration variable; we'll use this several 5533 // times throughout. 5534 Expr *IterationVarRef 5535 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5536 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5537 5538 // Create the DeclStmt that holds the iteration variable. 5539 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5540 5541 // Create the comparison against the array bound. 5542 llvm::APInt Upper 5543 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5544 Expr *Comparison 5545 = new (S.Context) BinaryOperator(IterationVarRef, 5546 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5547 BO_NE, S.Context.BoolTy, 5548 VK_RValue, OK_Ordinary, Loc); 5549 5550 // Create the pre-increment of the iteration variable. 5551 Expr *Increment 5552 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5553 VK_LValue, OK_Ordinary, Loc); 5554 5555 // Subscript the "from" and "to" expressions with the iteration variable. 5556 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5557 IterationVarRef, Loc)); 5558 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5559 IterationVarRef, Loc)); 5560 5561 // Build the copy for an individual element of the array. 5562 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5563 To, From, CopyingBaseSubobject, 5564 Depth + 1); 5565 if (Copy.isInvalid()) 5566 return StmtError(); 5567 5568 // Construct the loop that copies all elements of this array. 5569 return S.ActOnForStmt(Loc, Loc, InitStmt, 5570 S.MakeFullExpr(Comparison), 5571 0, S.MakeFullExpr(Increment), 5572 Loc, Copy.take()); 5573} 5574 5575/// \brief Determine whether the given class has a copy assignment operator 5576/// that accepts a const-qualified argument. 5577static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5578 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5579 5580 if (!Class->hasDeclaredCopyAssignment()) 5581 S.DeclareImplicitCopyAssignment(Class); 5582 5583 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5584 DeclarationName OpName 5585 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5586 5587 DeclContext::lookup_const_iterator Op, OpEnd; 5588 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5589 // C++ [class.copy]p9: 5590 // A user-declared copy assignment operator is a non-static non-template 5591 // member function of class X with exactly one parameter of type X, X&, 5592 // const X&, volatile X& or const volatile X&. 5593 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5594 if (!Method) 5595 continue; 5596 5597 if (Method->isStatic()) 5598 continue; 5599 if (Method->getPrimaryTemplate()) 5600 continue; 5601 const FunctionProtoType *FnType = 5602 Method->getType()->getAs<FunctionProtoType>(); 5603 assert(FnType && "Overloaded operator has no prototype."); 5604 // Don't assert on this; an invalid decl might have been left in the AST. 5605 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5606 continue; 5607 bool AcceptsConst = true; 5608 QualType ArgType = FnType->getArgType(0); 5609 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5610 ArgType = Ref->getPointeeType(); 5611 // Is it a non-const lvalue reference? 5612 if (!ArgType.isConstQualified()) 5613 AcceptsConst = false; 5614 } 5615 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5616 continue; 5617 5618 // We have a single argument of type cv X or cv X&, i.e. we've found the 5619 // copy assignment operator. Return whether it accepts const arguments. 5620 return AcceptsConst; 5621 } 5622 assert(Class->isInvalidDecl() && 5623 "No copy assignment operator declared in valid code."); 5624 return false; 5625} 5626 5627CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5628 // Note: The following rules are largely analoguous to the copy 5629 // constructor rules. Note that virtual bases are not taken into account 5630 // for determining the argument type of the operator. Note also that 5631 // operators taking an object instead of a reference are allowed. 5632 5633 5634 // C++ [class.copy]p10: 5635 // If the class definition does not explicitly declare a copy 5636 // assignment operator, one is declared implicitly. 5637 // The implicitly-defined copy assignment operator for a class X 5638 // will have the form 5639 // 5640 // X& X::operator=(const X&) 5641 // 5642 // if 5643 bool HasConstCopyAssignment = true; 5644 5645 // -- each direct base class B of X has a copy assignment operator 5646 // whose parameter is of type const B&, const volatile B& or B, 5647 // and 5648 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5649 BaseEnd = ClassDecl->bases_end(); 5650 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5651 assert(!Base->getType()->isDependentType() && 5652 "Cannot generate implicit members for class with dependent bases."); 5653 const CXXRecordDecl *BaseClassDecl 5654 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5655 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5656 } 5657 5658 // -- for all the nonstatic data members of X that are of a class 5659 // type M (or array thereof), each such class type has a copy 5660 // assignment operator whose parameter is of type const M&, 5661 // const volatile M& or M. 5662 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5663 FieldEnd = ClassDecl->field_end(); 5664 HasConstCopyAssignment && Field != FieldEnd; 5665 ++Field) { 5666 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5667 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5668 const CXXRecordDecl *FieldClassDecl 5669 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5670 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5671 } 5672 } 5673 5674 // Otherwise, the implicitly declared copy assignment operator will 5675 // have the form 5676 // 5677 // X& X::operator=(X&) 5678 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5679 QualType RetType = Context.getLValueReferenceType(ArgType); 5680 if (HasConstCopyAssignment) 5681 ArgType = ArgType.withConst(); 5682 ArgType = Context.getLValueReferenceType(ArgType); 5683 5684 // C++ [except.spec]p14: 5685 // An implicitly declared special member function (Clause 12) shall have an 5686 // exception-specification. [...] 5687 ImplicitExceptionSpecification ExceptSpec(Context); 5688 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5689 BaseEnd = ClassDecl->bases_end(); 5690 Base != BaseEnd; ++Base) { 5691 CXXRecordDecl *BaseClassDecl 5692 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5693 5694 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5695 DeclareImplicitCopyAssignment(BaseClassDecl); 5696 5697 if (CXXMethodDecl *CopyAssign 5698 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5699 ExceptSpec.CalledDecl(CopyAssign); 5700 } 5701 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5702 FieldEnd = ClassDecl->field_end(); 5703 Field != FieldEnd; 5704 ++Field) { 5705 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5706 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5707 CXXRecordDecl *FieldClassDecl 5708 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5709 5710 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5711 DeclareImplicitCopyAssignment(FieldClassDecl); 5712 5713 if (CXXMethodDecl *CopyAssign 5714 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5715 ExceptSpec.CalledDecl(CopyAssign); 5716 } 5717 } 5718 5719 // An implicitly-declared copy assignment operator is an inline public 5720 // member of its class. 5721 FunctionProtoType::ExtProtoInfo EPI; 5722 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5723 EPI.NumExceptions = ExceptSpec.size(); 5724 EPI.Exceptions = ExceptSpec.data(); 5725 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5726 SourceLocation ClassLoc = ClassDecl->getLocation(); 5727 DeclarationNameInfo NameInfo(Name, ClassLoc); 5728 CXXMethodDecl *CopyAssignment 5729 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5730 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5731 /*TInfo=*/0, /*isStatic=*/false, 5732 /*StorageClassAsWritten=*/SC_None, 5733 /*isInline=*/true, 5734 SourceLocation()); 5735 CopyAssignment->setAccess(AS_public); 5736 CopyAssignment->setImplicit(); 5737 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5738 5739 // Add the parameter to the operator. 5740 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5741 ClassLoc, ClassLoc, /*Id=*/0, 5742 ArgType, /*TInfo=*/0, 5743 SC_None, 5744 SC_None, 0); 5745 CopyAssignment->setParams(&FromParam, 1); 5746 5747 // Note that we have added this copy-assignment operator. 5748 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5749 5750 if (Scope *S = getScopeForContext(ClassDecl)) 5751 PushOnScopeChains(CopyAssignment, S, false); 5752 ClassDecl->addDecl(CopyAssignment); 5753 5754 AddOverriddenMethods(ClassDecl, CopyAssignment); 5755 return CopyAssignment; 5756} 5757 5758void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5759 CXXMethodDecl *CopyAssignOperator) { 5760 assert((CopyAssignOperator->isImplicit() && 5761 CopyAssignOperator->isOverloadedOperator() && 5762 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5763 !CopyAssignOperator->isUsed(false)) && 5764 "DefineImplicitCopyAssignment called for wrong function"); 5765 5766 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5767 5768 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5769 CopyAssignOperator->setInvalidDecl(); 5770 return; 5771 } 5772 5773 CopyAssignOperator->setUsed(); 5774 5775 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5776 DiagnosticErrorTrap Trap(Diags); 5777 5778 // C++0x [class.copy]p30: 5779 // The implicitly-defined or explicitly-defaulted copy assignment operator 5780 // for a non-union class X performs memberwise copy assignment of its 5781 // subobjects. The direct base classes of X are assigned first, in the 5782 // order of their declaration in the base-specifier-list, and then the 5783 // immediate non-static data members of X are assigned, in the order in 5784 // which they were declared in the class definition. 5785 5786 // The statements that form the synthesized function body. 5787 ASTOwningVector<Stmt*> Statements(*this); 5788 5789 // The parameter for the "other" object, which we are copying from. 5790 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5791 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5792 QualType OtherRefType = Other->getType(); 5793 if (const LValueReferenceType *OtherRef 5794 = OtherRefType->getAs<LValueReferenceType>()) { 5795 OtherRefType = OtherRef->getPointeeType(); 5796 OtherQuals = OtherRefType.getQualifiers(); 5797 } 5798 5799 // Our location for everything implicitly-generated. 5800 SourceLocation Loc = CopyAssignOperator->getLocation(); 5801 5802 // Construct a reference to the "other" object. We'll be using this 5803 // throughout the generated ASTs. 5804 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5805 assert(OtherRef && "Reference to parameter cannot fail!"); 5806 5807 // Construct the "this" pointer. We'll be using this throughout the generated 5808 // ASTs. 5809 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5810 assert(This && "Reference to this cannot fail!"); 5811 5812 // Assign base classes. 5813 bool Invalid = false; 5814 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5815 E = ClassDecl->bases_end(); Base != E; ++Base) { 5816 // Form the assignment: 5817 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5818 QualType BaseType = Base->getType().getUnqualifiedType(); 5819 if (!BaseType->isRecordType()) { 5820 Invalid = true; 5821 continue; 5822 } 5823 5824 CXXCastPath BasePath; 5825 BasePath.push_back(Base); 5826 5827 // Construct the "from" expression, which is an implicit cast to the 5828 // appropriately-qualified base type. 5829 Expr *From = OtherRef; 5830 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5831 CK_UncheckedDerivedToBase, 5832 VK_LValue, &BasePath).take(); 5833 5834 // Dereference "this". 5835 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5836 5837 // Implicitly cast "this" to the appropriately-qualified base type. 5838 To = ImpCastExprToType(To.take(), 5839 Context.getCVRQualifiedType(BaseType, 5840 CopyAssignOperator->getTypeQualifiers()), 5841 CK_UncheckedDerivedToBase, 5842 VK_LValue, &BasePath); 5843 5844 // Build the copy. 5845 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5846 To.get(), From, 5847 /*CopyingBaseSubobject=*/true); 5848 if (Copy.isInvalid()) { 5849 Diag(CurrentLocation, diag::note_member_synthesized_at) 5850 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5851 CopyAssignOperator->setInvalidDecl(); 5852 return; 5853 } 5854 5855 // Success! Record the copy. 5856 Statements.push_back(Copy.takeAs<Expr>()); 5857 } 5858 5859 // \brief Reference to the __builtin_memcpy function. 5860 Expr *BuiltinMemCpyRef = 0; 5861 // \brief Reference to the __builtin_objc_memmove_collectable function. 5862 Expr *CollectableMemCpyRef = 0; 5863 5864 // Assign non-static members. 5865 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5866 FieldEnd = ClassDecl->field_end(); 5867 Field != FieldEnd; ++Field) { 5868 // Check for members of reference type; we can't copy those. 5869 if (Field->getType()->isReferenceType()) { 5870 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5871 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5872 Diag(Field->getLocation(), diag::note_declared_at); 5873 Diag(CurrentLocation, diag::note_member_synthesized_at) 5874 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5875 Invalid = true; 5876 continue; 5877 } 5878 5879 // Check for members of const-qualified, non-class type. 5880 QualType BaseType = Context.getBaseElementType(Field->getType()); 5881 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5882 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5883 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5884 Diag(Field->getLocation(), diag::note_declared_at); 5885 Diag(CurrentLocation, diag::note_member_synthesized_at) 5886 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5887 Invalid = true; 5888 continue; 5889 } 5890 5891 QualType FieldType = Field->getType().getNonReferenceType(); 5892 if (FieldType->isIncompleteArrayType()) { 5893 assert(ClassDecl->hasFlexibleArrayMember() && 5894 "Incomplete array type is not valid"); 5895 continue; 5896 } 5897 5898 // Build references to the field in the object we're copying from and to. 5899 CXXScopeSpec SS; // Intentionally empty 5900 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5901 LookupMemberName); 5902 MemberLookup.addDecl(*Field); 5903 MemberLookup.resolveKind(); 5904 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5905 Loc, /*IsArrow=*/false, 5906 SS, 0, MemberLookup, 0); 5907 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5908 Loc, /*IsArrow=*/true, 5909 SS, 0, MemberLookup, 0); 5910 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5911 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5912 5913 // If the field should be copied with __builtin_memcpy rather than via 5914 // explicit assignments, do so. This optimization only applies for arrays 5915 // of scalars and arrays of class type with trivial copy-assignment 5916 // operators. 5917 if (FieldType->isArrayType() && 5918 (!BaseType->isRecordType() || 5919 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5920 ->hasTrivialCopyAssignment())) { 5921 // Compute the size of the memory buffer to be copied. 5922 QualType SizeType = Context.getSizeType(); 5923 llvm::APInt Size(Context.getTypeSize(SizeType), 5924 Context.getTypeSizeInChars(BaseType).getQuantity()); 5925 for (const ConstantArrayType *Array 5926 = Context.getAsConstantArrayType(FieldType); 5927 Array; 5928 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5929 llvm::APInt ArraySize 5930 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5931 Size *= ArraySize; 5932 } 5933 5934 // Take the address of the field references for "from" and "to". 5935 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5936 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5937 5938 bool NeedsCollectableMemCpy = 5939 (BaseType->isRecordType() && 5940 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5941 5942 if (NeedsCollectableMemCpy) { 5943 if (!CollectableMemCpyRef) { 5944 // Create a reference to the __builtin_objc_memmove_collectable function. 5945 LookupResult R(*this, 5946 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5947 Loc, LookupOrdinaryName); 5948 LookupName(R, TUScope, true); 5949 5950 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5951 if (!CollectableMemCpy) { 5952 // Something went horribly wrong earlier, and we will have 5953 // complained about it. 5954 Invalid = true; 5955 continue; 5956 } 5957 5958 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5959 CollectableMemCpy->getType(), 5960 VK_LValue, Loc, 0).take(); 5961 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5962 } 5963 } 5964 // Create a reference to the __builtin_memcpy builtin function. 5965 else if (!BuiltinMemCpyRef) { 5966 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5967 LookupOrdinaryName); 5968 LookupName(R, TUScope, true); 5969 5970 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5971 if (!BuiltinMemCpy) { 5972 // Something went horribly wrong earlier, and we will have complained 5973 // about it. 5974 Invalid = true; 5975 continue; 5976 } 5977 5978 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5979 BuiltinMemCpy->getType(), 5980 VK_LValue, Loc, 0).take(); 5981 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5982 } 5983 5984 ASTOwningVector<Expr*> CallArgs(*this); 5985 CallArgs.push_back(To.takeAs<Expr>()); 5986 CallArgs.push_back(From.takeAs<Expr>()); 5987 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5988 ExprResult Call = ExprError(); 5989 if (NeedsCollectableMemCpy) 5990 Call = ActOnCallExpr(/*Scope=*/0, 5991 CollectableMemCpyRef, 5992 Loc, move_arg(CallArgs), 5993 Loc); 5994 else 5995 Call = ActOnCallExpr(/*Scope=*/0, 5996 BuiltinMemCpyRef, 5997 Loc, move_arg(CallArgs), 5998 Loc); 5999 6000 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6001 Statements.push_back(Call.takeAs<Expr>()); 6002 continue; 6003 } 6004 6005 // Build the copy of this field. 6006 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6007 To.get(), From.get(), 6008 /*CopyingBaseSubobject=*/false); 6009 if (Copy.isInvalid()) { 6010 Diag(CurrentLocation, diag::note_member_synthesized_at) 6011 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6012 CopyAssignOperator->setInvalidDecl(); 6013 return; 6014 } 6015 6016 // Success! Record the copy. 6017 Statements.push_back(Copy.takeAs<Stmt>()); 6018 } 6019 6020 if (!Invalid) { 6021 // Add a "return *this;" 6022 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6023 6024 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6025 if (Return.isInvalid()) 6026 Invalid = true; 6027 else { 6028 Statements.push_back(Return.takeAs<Stmt>()); 6029 6030 if (Trap.hasErrorOccurred()) { 6031 Diag(CurrentLocation, diag::note_member_synthesized_at) 6032 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6033 Invalid = true; 6034 } 6035 } 6036 } 6037 6038 if (Invalid) { 6039 CopyAssignOperator->setInvalidDecl(); 6040 return; 6041 } 6042 6043 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6044 /*isStmtExpr=*/false); 6045 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6046 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6047 6048 if (ASTMutationListener *L = getASTMutationListener()) { 6049 L->CompletedImplicitDefinition(CopyAssignOperator); 6050 } 6051} 6052 6053CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 6054 CXXRecordDecl *ClassDecl) { 6055 // C++ [class.copy]p4: 6056 // If the class definition does not explicitly declare a copy 6057 // constructor, one is declared implicitly. 6058 6059 // C++ [class.copy]p5: 6060 // The implicitly-declared copy constructor for a class X will 6061 // have the form 6062 // 6063 // X::X(const X&) 6064 // 6065 // if 6066 bool HasConstCopyConstructor = true; 6067 6068 // -- each direct or virtual base class B of X has a copy 6069 // constructor whose first parameter is of type const B& or 6070 // const volatile B&, and 6071 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6072 BaseEnd = ClassDecl->bases_end(); 6073 HasConstCopyConstructor && Base != BaseEnd; 6074 ++Base) { 6075 // Virtual bases are handled below. 6076 if (Base->isVirtual()) 6077 continue; 6078 6079 CXXRecordDecl *BaseClassDecl 6080 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6081 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6082 DeclareImplicitCopyConstructor(BaseClassDecl); 6083 6084 HasConstCopyConstructor 6085 = BaseClassDecl->hasConstCopyConstructor(Context); 6086 } 6087 6088 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6089 BaseEnd = ClassDecl->vbases_end(); 6090 HasConstCopyConstructor && Base != BaseEnd; 6091 ++Base) { 6092 CXXRecordDecl *BaseClassDecl 6093 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6094 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6095 DeclareImplicitCopyConstructor(BaseClassDecl); 6096 6097 HasConstCopyConstructor 6098 = BaseClassDecl->hasConstCopyConstructor(Context); 6099 } 6100 6101 // -- for all the nonstatic data members of X that are of a 6102 // class type M (or array thereof), each such class type 6103 // has a copy constructor whose first parameter is of type 6104 // const M& or const volatile M&. 6105 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6106 FieldEnd = ClassDecl->field_end(); 6107 HasConstCopyConstructor && Field != FieldEnd; 6108 ++Field) { 6109 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6110 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6111 CXXRecordDecl *FieldClassDecl 6112 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6113 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6114 DeclareImplicitCopyConstructor(FieldClassDecl); 6115 6116 HasConstCopyConstructor 6117 = FieldClassDecl->hasConstCopyConstructor(Context); 6118 } 6119 } 6120 6121 // Otherwise, the implicitly declared copy constructor will have 6122 // the form 6123 // 6124 // X::X(X&) 6125 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6126 QualType ArgType = ClassType; 6127 if (HasConstCopyConstructor) 6128 ArgType = ArgType.withConst(); 6129 ArgType = Context.getLValueReferenceType(ArgType); 6130 6131 // C++ [except.spec]p14: 6132 // An implicitly declared special member function (Clause 12) shall have an 6133 // exception-specification. [...] 6134 ImplicitExceptionSpecification ExceptSpec(Context); 6135 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6136 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6137 BaseEnd = ClassDecl->bases_end(); 6138 Base != BaseEnd; 6139 ++Base) { 6140 // Virtual bases are handled below. 6141 if (Base->isVirtual()) 6142 continue; 6143 6144 CXXRecordDecl *BaseClassDecl 6145 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6146 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6147 DeclareImplicitCopyConstructor(BaseClassDecl); 6148 6149 if (CXXConstructorDecl *CopyConstructor 6150 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6151 ExceptSpec.CalledDecl(CopyConstructor); 6152 } 6153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6154 BaseEnd = ClassDecl->vbases_end(); 6155 Base != BaseEnd; 6156 ++Base) { 6157 CXXRecordDecl *BaseClassDecl 6158 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6159 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6160 DeclareImplicitCopyConstructor(BaseClassDecl); 6161 6162 if (CXXConstructorDecl *CopyConstructor 6163 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6164 ExceptSpec.CalledDecl(CopyConstructor); 6165 } 6166 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6167 FieldEnd = ClassDecl->field_end(); 6168 Field != FieldEnd; 6169 ++Field) { 6170 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6171 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6172 CXXRecordDecl *FieldClassDecl 6173 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6174 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6175 DeclareImplicitCopyConstructor(FieldClassDecl); 6176 6177 if (CXXConstructorDecl *CopyConstructor 6178 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6179 ExceptSpec.CalledDecl(CopyConstructor); 6180 } 6181 } 6182 6183 // An implicitly-declared copy constructor is an inline public 6184 // member of its class. 6185 FunctionProtoType::ExtProtoInfo EPI; 6186 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6187 EPI.NumExceptions = ExceptSpec.size(); 6188 EPI.Exceptions = ExceptSpec.data(); 6189 DeclarationName Name 6190 = Context.DeclarationNames.getCXXConstructorName( 6191 Context.getCanonicalType(ClassType)); 6192 SourceLocation ClassLoc = ClassDecl->getLocation(); 6193 DeclarationNameInfo NameInfo(Name, ClassLoc); 6194 CXXConstructorDecl *CopyConstructor 6195 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6196 Context.getFunctionType(Context.VoidTy, 6197 &ArgType, 1, EPI), 6198 /*TInfo=*/0, 6199 /*isExplicit=*/false, 6200 /*isInline=*/true, 6201 /*isImplicitlyDeclared=*/true, 6202 /*isExplicitlyDefaulted=*/false); 6203 CopyConstructor->setAccess(AS_public); 6204 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6205 6206 // Note that we have declared this constructor. 6207 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6208 6209 // Add the parameter to the constructor. 6210 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6211 ClassLoc, ClassLoc, 6212 /*IdentifierInfo=*/0, 6213 ArgType, /*TInfo=*/0, 6214 SC_None, 6215 SC_None, 0); 6216 CopyConstructor->setParams(&FromParam, 1); 6217 if (Scope *S = getScopeForContext(ClassDecl)) 6218 PushOnScopeChains(CopyConstructor, S, false); 6219 ClassDecl->addDecl(CopyConstructor); 6220 6221 return CopyConstructor; 6222} 6223 6224void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6225 CXXConstructorDecl *CopyConstructor, 6226 unsigned TypeQuals) { 6227 assert((CopyConstructor->isImplicit() && 6228 CopyConstructor->isCopyConstructor(TypeQuals) && 6229 !CopyConstructor->isUsed(false)) && 6230 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6231 6232 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6233 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6234 6235 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6236 DiagnosticErrorTrap Trap(Diags); 6237 6238 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6239 Trap.hasErrorOccurred()) { 6240 Diag(CurrentLocation, diag::note_member_synthesized_at) 6241 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6242 CopyConstructor->setInvalidDecl(); 6243 } else { 6244 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6245 CopyConstructor->getLocation(), 6246 MultiStmtArg(*this, 0, 0), 6247 /*isStmtExpr=*/false) 6248 .takeAs<Stmt>()); 6249 } 6250 6251 CopyConstructor->setUsed(); 6252 6253 if (ASTMutationListener *L = getASTMutationListener()) { 6254 L->CompletedImplicitDefinition(CopyConstructor); 6255 } 6256} 6257 6258ExprResult 6259Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6260 CXXConstructorDecl *Constructor, 6261 MultiExprArg ExprArgs, 6262 bool RequiresZeroInit, 6263 unsigned ConstructKind, 6264 SourceRange ParenRange) { 6265 bool Elidable = false; 6266 6267 // C++0x [class.copy]p34: 6268 // When certain criteria are met, an implementation is allowed to 6269 // omit the copy/move construction of a class object, even if the 6270 // copy/move constructor and/or destructor for the object have 6271 // side effects. [...] 6272 // - when a temporary class object that has not been bound to a 6273 // reference (12.2) would be copied/moved to a class object 6274 // with the same cv-unqualified type, the copy/move operation 6275 // can be omitted by constructing the temporary object 6276 // directly into the target of the omitted copy/move 6277 if (ConstructKind == CXXConstructExpr::CK_Complete && 6278 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6279 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6280 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6281 } 6282 6283 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6284 Elidable, move(ExprArgs), RequiresZeroInit, 6285 ConstructKind, ParenRange); 6286} 6287 6288/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6289/// including handling of its default argument expressions. 6290ExprResult 6291Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6292 CXXConstructorDecl *Constructor, bool Elidable, 6293 MultiExprArg ExprArgs, 6294 bool RequiresZeroInit, 6295 unsigned ConstructKind, 6296 SourceRange ParenRange) { 6297 unsigned NumExprs = ExprArgs.size(); 6298 Expr **Exprs = (Expr **)ExprArgs.release(); 6299 6300 for (specific_attr_iterator<NonNullAttr> 6301 i = Constructor->specific_attr_begin<NonNullAttr>(), 6302 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6303 const NonNullAttr *NonNull = *i; 6304 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6305 } 6306 6307 MarkDeclarationReferenced(ConstructLoc, Constructor); 6308 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6309 Constructor, Elidable, Exprs, NumExprs, 6310 RequiresZeroInit, 6311 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6312 ParenRange)); 6313} 6314 6315bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6316 CXXConstructorDecl *Constructor, 6317 MultiExprArg Exprs) { 6318 // FIXME: Provide the correct paren SourceRange when available. 6319 ExprResult TempResult = 6320 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6321 move(Exprs), false, CXXConstructExpr::CK_Complete, 6322 SourceRange()); 6323 if (TempResult.isInvalid()) 6324 return true; 6325 6326 Expr *Temp = TempResult.takeAs<Expr>(); 6327 CheckImplicitConversions(Temp, VD->getLocation()); 6328 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6329 Temp = MaybeCreateExprWithCleanups(Temp); 6330 VD->setInit(Temp); 6331 6332 return false; 6333} 6334 6335void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6336 if (VD->isInvalidDecl()) return; 6337 6338 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6339 if (ClassDecl->isInvalidDecl()) return; 6340 if (ClassDecl->hasTrivialDestructor()) return; 6341 if (ClassDecl->isDependentContext()) return; 6342 6343 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6344 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6345 CheckDestructorAccess(VD->getLocation(), Destructor, 6346 PDiag(diag::err_access_dtor_var) 6347 << VD->getDeclName() 6348 << VD->getType()); 6349 6350 if (!VD->hasGlobalStorage()) return; 6351 6352 // Emit warning for non-trivial dtor in global scope (a real global, 6353 // class-static, function-static). 6354 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6355 6356 // TODO: this should be re-enabled for static locals by !CXAAtExit 6357 if (!VD->isStaticLocal()) 6358 Diag(VD->getLocation(), diag::warn_global_destructor); 6359} 6360 6361/// AddCXXDirectInitializerToDecl - This action is called immediately after 6362/// ActOnDeclarator, when a C++ direct initializer is present. 6363/// e.g: "int x(1);" 6364void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6365 SourceLocation LParenLoc, 6366 MultiExprArg Exprs, 6367 SourceLocation RParenLoc, 6368 bool TypeMayContainAuto) { 6369 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6370 6371 // If there is no declaration, there was an error parsing it. Just ignore 6372 // the initializer. 6373 if (RealDecl == 0) 6374 return; 6375 6376 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6377 if (!VDecl) { 6378 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6379 RealDecl->setInvalidDecl(); 6380 return; 6381 } 6382 6383 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6384 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6385 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6386 if (Exprs.size() > 1) { 6387 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6388 diag::err_auto_var_init_multiple_expressions) 6389 << VDecl->getDeclName() << VDecl->getType() 6390 << VDecl->getSourceRange(); 6391 RealDecl->setInvalidDecl(); 6392 return; 6393 } 6394 6395 Expr *Init = Exprs.get()[0]; 6396 TypeSourceInfo *DeducedType = 0; 6397 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6398 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6399 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6400 << Init->getSourceRange(); 6401 if (!DeducedType) { 6402 RealDecl->setInvalidDecl(); 6403 return; 6404 } 6405 VDecl->setTypeSourceInfo(DeducedType); 6406 VDecl->setType(DeducedType->getType()); 6407 6408 // If this is a redeclaration, check that the type we just deduced matches 6409 // the previously declared type. 6410 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6411 MergeVarDeclTypes(VDecl, Old); 6412 } 6413 6414 // We will represent direct-initialization similarly to copy-initialization: 6415 // int x(1); -as-> int x = 1; 6416 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6417 // 6418 // Clients that want to distinguish between the two forms, can check for 6419 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6420 // A major benefit is that clients that don't particularly care about which 6421 // exactly form was it (like the CodeGen) can handle both cases without 6422 // special case code. 6423 6424 // C++ 8.5p11: 6425 // The form of initialization (using parentheses or '=') is generally 6426 // insignificant, but does matter when the entity being initialized has a 6427 // class type. 6428 6429 if (!VDecl->getType()->isDependentType() && 6430 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6431 diag::err_typecheck_decl_incomplete_type)) { 6432 VDecl->setInvalidDecl(); 6433 return; 6434 } 6435 6436 // The variable can not have an abstract class type. 6437 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6438 diag::err_abstract_type_in_decl, 6439 AbstractVariableType)) 6440 VDecl->setInvalidDecl(); 6441 6442 const VarDecl *Def; 6443 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6444 Diag(VDecl->getLocation(), diag::err_redefinition) 6445 << VDecl->getDeclName(); 6446 Diag(Def->getLocation(), diag::note_previous_definition); 6447 VDecl->setInvalidDecl(); 6448 return; 6449 } 6450 6451 // C++ [class.static.data]p4 6452 // If a static data member is of const integral or const 6453 // enumeration type, its declaration in the class definition can 6454 // specify a constant-initializer which shall be an integral 6455 // constant expression (5.19). In that case, the member can appear 6456 // in integral constant expressions. The member shall still be 6457 // defined in a namespace scope if it is used in the program and the 6458 // namespace scope definition shall not contain an initializer. 6459 // 6460 // We already performed a redefinition check above, but for static 6461 // data members we also need to check whether there was an in-class 6462 // declaration with an initializer. 6463 const VarDecl* PrevInit = 0; 6464 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6465 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6466 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6467 return; 6468 } 6469 6470 bool IsDependent = false; 6471 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6472 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6473 VDecl->setInvalidDecl(); 6474 return; 6475 } 6476 6477 if (Exprs.get()[I]->isTypeDependent()) 6478 IsDependent = true; 6479 } 6480 6481 // If either the declaration has a dependent type or if any of the 6482 // expressions is type-dependent, we represent the initialization 6483 // via a ParenListExpr for later use during template instantiation. 6484 if (VDecl->getType()->isDependentType() || IsDependent) { 6485 // Let clients know that initialization was done with a direct initializer. 6486 VDecl->setCXXDirectInitializer(true); 6487 6488 // Store the initialization expressions as a ParenListExpr. 6489 unsigned NumExprs = Exprs.size(); 6490 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6491 (Expr **)Exprs.release(), 6492 NumExprs, RParenLoc)); 6493 return; 6494 } 6495 6496 // Capture the variable that is being initialized and the style of 6497 // initialization. 6498 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6499 6500 // FIXME: Poor source location information. 6501 InitializationKind Kind 6502 = InitializationKind::CreateDirect(VDecl->getLocation(), 6503 LParenLoc, RParenLoc); 6504 6505 InitializationSequence InitSeq(*this, Entity, Kind, 6506 Exprs.get(), Exprs.size()); 6507 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6508 if (Result.isInvalid()) { 6509 VDecl->setInvalidDecl(); 6510 return; 6511 } 6512 6513 CheckImplicitConversions(Result.get(), LParenLoc); 6514 6515 Result = MaybeCreateExprWithCleanups(Result); 6516 VDecl->setInit(Result.takeAs<Expr>()); 6517 VDecl->setCXXDirectInitializer(true); 6518 6519 CheckCompleteVariableDeclaration(VDecl); 6520} 6521 6522/// \brief Given a constructor and the set of arguments provided for the 6523/// constructor, convert the arguments and add any required default arguments 6524/// to form a proper call to this constructor. 6525/// 6526/// \returns true if an error occurred, false otherwise. 6527bool 6528Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6529 MultiExprArg ArgsPtr, 6530 SourceLocation Loc, 6531 ASTOwningVector<Expr*> &ConvertedArgs) { 6532 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6533 unsigned NumArgs = ArgsPtr.size(); 6534 Expr **Args = (Expr **)ArgsPtr.get(); 6535 6536 const FunctionProtoType *Proto 6537 = Constructor->getType()->getAs<FunctionProtoType>(); 6538 assert(Proto && "Constructor without a prototype?"); 6539 unsigned NumArgsInProto = Proto->getNumArgs(); 6540 6541 // If too few arguments are available, we'll fill in the rest with defaults. 6542 if (NumArgs < NumArgsInProto) 6543 ConvertedArgs.reserve(NumArgsInProto); 6544 else 6545 ConvertedArgs.reserve(NumArgs); 6546 6547 VariadicCallType CallType = 6548 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6549 llvm::SmallVector<Expr *, 8> AllArgs; 6550 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6551 Proto, 0, Args, NumArgs, AllArgs, 6552 CallType); 6553 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6554 ConvertedArgs.push_back(AllArgs[i]); 6555 return Invalid; 6556} 6557 6558static inline bool 6559CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6560 const FunctionDecl *FnDecl) { 6561 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6562 if (isa<NamespaceDecl>(DC)) { 6563 return SemaRef.Diag(FnDecl->getLocation(), 6564 diag::err_operator_new_delete_declared_in_namespace) 6565 << FnDecl->getDeclName(); 6566 } 6567 6568 if (isa<TranslationUnitDecl>(DC) && 6569 FnDecl->getStorageClass() == SC_Static) { 6570 return SemaRef.Diag(FnDecl->getLocation(), 6571 diag::err_operator_new_delete_declared_static) 6572 << FnDecl->getDeclName(); 6573 } 6574 6575 return false; 6576} 6577 6578static inline bool 6579CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6580 CanQualType ExpectedResultType, 6581 CanQualType ExpectedFirstParamType, 6582 unsigned DependentParamTypeDiag, 6583 unsigned InvalidParamTypeDiag) { 6584 QualType ResultType = 6585 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6586 6587 // Check that the result type is not dependent. 6588 if (ResultType->isDependentType()) 6589 return SemaRef.Diag(FnDecl->getLocation(), 6590 diag::err_operator_new_delete_dependent_result_type) 6591 << FnDecl->getDeclName() << ExpectedResultType; 6592 6593 // Check that the result type is what we expect. 6594 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6595 return SemaRef.Diag(FnDecl->getLocation(), 6596 diag::err_operator_new_delete_invalid_result_type) 6597 << FnDecl->getDeclName() << ExpectedResultType; 6598 6599 // A function template must have at least 2 parameters. 6600 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6601 return SemaRef.Diag(FnDecl->getLocation(), 6602 diag::err_operator_new_delete_template_too_few_parameters) 6603 << FnDecl->getDeclName(); 6604 6605 // The function decl must have at least 1 parameter. 6606 if (FnDecl->getNumParams() == 0) 6607 return SemaRef.Diag(FnDecl->getLocation(), 6608 diag::err_operator_new_delete_too_few_parameters) 6609 << FnDecl->getDeclName(); 6610 6611 // Check the the first parameter type is not dependent. 6612 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6613 if (FirstParamType->isDependentType()) 6614 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6615 << FnDecl->getDeclName() << ExpectedFirstParamType; 6616 6617 // Check that the first parameter type is what we expect. 6618 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6619 ExpectedFirstParamType) 6620 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6621 << FnDecl->getDeclName() << ExpectedFirstParamType; 6622 6623 return false; 6624} 6625 6626static bool 6627CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6628 // C++ [basic.stc.dynamic.allocation]p1: 6629 // A program is ill-formed if an allocation function is declared in a 6630 // namespace scope other than global scope or declared static in global 6631 // scope. 6632 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6633 return true; 6634 6635 CanQualType SizeTy = 6636 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6637 6638 // C++ [basic.stc.dynamic.allocation]p1: 6639 // The return type shall be void*. The first parameter shall have type 6640 // std::size_t. 6641 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6642 SizeTy, 6643 diag::err_operator_new_dependent_param_type, 6644 diag::err_operator_new_param_type)) 6645 return true; 6646 6647 // C++ [basic.stc.dynamic.allocation]p1: 6648 // The first parameter shall not have an associated default argument. 6649 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6650 return SemaRef.Diag(FnDecl->getLocation(), 6651 diag::err_operator_new_default_arg) 6652 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6653 6654 return false; 6655} 6656 6657static bool 6658CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6659 // C++ [basic.stc.dynamic.deallocation]p1: 6660 // A program is ill-formed if deallocation functions are declared in a 6661 // namespace scope other than global scope or declared static in global 6662 // scope. 6663 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6664 return true; 6665 6666 // C++ [basic.stc.dynamic.deallocation]p2: 6667 // Each deallocation function shall return void and its first parameter 6668 // shall be void*. 6669 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6670 SemaRef.Context.VoidPtrTy, 6671 diag::err_operator_delete_dependent_param_type, 6672 diag::err_operator_delete_param_type)) 6673 return true; 6674 6675 return false; 6676} 6677 6678/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6679/// of this overloaded operator is well-formed. If so, returns false; 6680/// otherwise, emits appropriate diagnostics and returns true. 6681bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6682 assert(FnDecl && FnDecl->isOverloadedOperator() && 6683 "Expected an overloaded operator declaration"); 6684 6685 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6686 6687 // C++ [over.oper]p5: 6688 // The allocation and deallocation functions, operator new, 6689 // operator new[], operator delete and operator delete[], are 6690 // described completely in 3.7.3. The attributes and restrictions 6691 // found in the rest of this subclause do not apply to them unless 6692 // explicitly stated in 3.7.3. 6693 if (Op == OO_Delete || Op == OO_Array_Delete) 6694 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6695 6696 if (Op == OO_New || Op == OO_Array_New) 6697 return CheckOperatorNewDeclaration(*this, FnDecl); 6698 6699 // C++ [over.oper]p6: 6700 // An operator function shall either be a non-static member 6701 // function or be a non-member function and have at least one 6702 // parameter whose type is a class, a reference to a class, an 6703 // enumeration, or a reference to an enumeration. 6704 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6705 if (MethodDecl->isStatic()) 6706 return Diag(FnDecl->getLocation(), 6707 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6708 } else { 6709 bool ClassOrEnumParam = false; 6710 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6711 ParamEnd = FnDecl->param_end(); 6712 Param != ParamEnd; ++Param) { 6713 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6714 if (ParamType->isDependentType() || ParamType->isRecordType() || 6715 ParamType->isEnumeralType()) { 6716 ClassOrEnumParam = true; 6717 break; 6718 } 6719 } 6720 6721 if (!ClassOrEnumParam) 6722 return Diag(FnDecl->getLocation(), 6723 diag::err_operator_overload_needs_class_or_enum) 6724 << FnDecl->getDeclName(); 6725 } 6726 6727 // C++ [over.oper]p8: 6728 // An operator function cannot have default arguments (8.3.6), 6729 // except where explicitly stated below. 6730 // 6731 // Only the function-call operator allows default arguments 6732 // (C++ [over.call]p1). 6733 if (Op != OO_Call) { 6734 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6735 Param != FnDecl->param_end(); ++Param) { 6736 if ((*Param)->hasDefaultArg()) 6737 return Diag((*Param)->getLocation(), 6738 diag::err_operator_overload_default_arg) 6739 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6740 } 6741 } 6742 6743 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6744 { false, false, false } 6745#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6746 , { Unary, Binary, MemberOnly } 6747#include "clang/Basic/OperatorKinds.def" 6748 }; 6749 6750 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6751 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6752 bool MustBeMemberOperator = OperatorUses[Op][2]; 6753 6754 // C++ [over.oper]p8: 6755 // [...] Operator functions cannot have more or fewer parameters 6756 // than the number required for the corresponding operator, as 6757 // described in the rest of this subclause. 6758 unsigned NumParams = FnDecl->getNumParams() 6759 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6760 if (Op != OO_Call && 6761 ((NumParams == 1 && !CanBeUnaryOperator) || 6762 (NumParams == 2 && !CanBeBinaryOperator) || 6763 (NumParams < 1) || (NumParams > 2))) { 6764 // We have the wrong number of parameters. 6765 unsigned ErrorKind; 6766 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6767 ErrorKind = 2; // 2 -> unary or binary. 6768 } else if (CanBeUnaryOperator) { 6769 ErrorKind = 0; // 0 -> unary 6770 } else { 6771 assert(CanBeBinaryOperator && 6772 "All non-call overloaded operators are unary or binary!"); 6773 ErrorKind = 1; // 1 -> binary 6774 } 6775 6776 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6777 << FnDecl->getDeclName() << NumParams << ErrorKind; 6778 } 6779 6780 // Overloaded operators other than operator() cannot be variadic. 6781 if (Op != OO_Call && 6782 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6783 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6784 << FnDecl->getDeclName(); 6785 } 6786 6787 // Some operators must be non-static member functions. 6788 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6789 return Diag(FnDecl->getLocation(), 6790 diag::err_operator_overload_must_be_member) 6791 << FnDecl->getDeclName(); 6792 } 6793 6794 // C++ [over.inc]p1: 6795 // The user-defined function called operator++ implements the 6796 // prefix and postfix ++ operator. If this function is a member 6797 // function with no parameters, or a non-member function with one 6798 // parameter of class or enumeration type, it defines the prefix 6799 // increment operator ++ for objects of that type. If the function 6800 // is a member function with one parameter (which shall be of type 6801 // int) or a non-member function with two parameters (the second 6802 // of which shall be of type int), it defines the postfix 6803 // increment operator ++ for objects of that type. 6804 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6805 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6806 bool ParamIsInt = false; 6807 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6808 ParamIsInt = BT->getKind() == BuiltinType::Int; 6809 6810 if (!ParamIsInt) 6811 return Diag(LastParam->getLocation(), 6812 diag::err_operator_overload_post_incdec_must_be_int) 6813 << LastParam->getType() << (Op == OO_MinusMinus); 6814 } 6815 6816 return false; 6817} 6818 6819/// CheckLiteralOperatorDeclaration - Check whether the declaration 6820/// of this literal operator function is well-formed. If so, returns 6821/// false; otherwise, emits appropriate diagnostics and returns true. 6822bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6823 DeclContext *DC = FnDecl->getDeclContext(); 6824 Decl::Kind Kind = DC->getDeclKind(); 6825 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6826 Kind != Decl::LinkageSpec) { 6827 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6828 << FnDecl->getDeclName(); 6829 return true; 6830 } 6831 6832 bool Valid = false; 6833 6834 // template <char...> type operator "" name() is the only valid template 6835 // signature, and the only valid signature with no parameters. 6836 if (FnDecl->param_size() == 0) { 6837 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6838 // Must have only one template parameter 6839 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6840 if (Params->size() == 1) { 6841 NonTypeTemplateParmDecl *PmDecl = 6842 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6843 6844 // The template parameter must be a char parameter pack. 6845 if (PmDecl && PmDecl->isTemplateParameterPack() && 6846 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6847 Valid = true; 6848 } 6849 } 6850 } else { 6851 // Check the first parameter 6852 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6853 6854 QualType T = (*Param)->getType(); 6855 6856 // unsigned long long int, long double, and any character type are allowed 6857 // as the only parameters. 6858 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6859 Context.hasSameType(T, Context.LongDoubleTy) || 6860 Context.hasSameType(T, Context.CharTy) || 6861 Context.hasSameType(T, Context.WCharTy) || 6862 Context.hasSameType(T, Context.Char16Ty) || 6863 Context.hasSameType(T, Context.Char32Ty)) { 6864 if (++Param == FnDecl->param_end()) 6865 Valid = true; 6866 goto FinishedParams; 6867 } 6868 6869 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6870 const PointerType *PT = T->getAs<PointerType>(); 6871 if (!PT) 6872 goto FinishedParams; 6873 T = PT->getPointeeType(); 6874 if (!T.isConstQualified()) 6875 goto FinishedParams; 6876 T = T.getUnqualifiedType(); 6877 6878 // Move on to the second parameter; 6879 ++Param; 6880 6881 // If there is no second parameter, the first must be a const char * 6882 if (Param == FnDecl->param_end()) { 6883 if (Context.hasSameType(T, Context.CharTy)) 6884 Valid = true; 6885 goto FinishedParams; 6886 } 6887 6888 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6889 // are allowed as the first parameter to a two-parameter function 6890 if (!(Context.hasSameType(T, Context.CharTy) || 6891 Context.hasSameType(T, Context.WCharTy) || 6892 Context.hasSameType(T, Context.Char16Ty) || 6893 Context.hasSameType(T, Context.Char32Ty))) 6894 goto FinishedParams; 6895 6896 // The second and final parameter must be an std::size_t 6897 T = (*Param)->getType().getUnqualifiedType(); 6898 if (Context.hasSameType(T, Context.getSizeType()) && 6899 ++Param == FnDecl->param_end()) 6900 Valid = true; 6901 } 6902 6903 // FIXME: This diagnostic is absolutely terrible. 6904FinishedParams: 6905 if (!Valid) { 6906 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6907 << FnDecl->getDeclName(); 6908 return true; 6909 } 6910 6911 return false; 6912} 6913 6914/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6915/// linkage specification, including the language and (if present) 6916/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6917/// the location of the language string literal, which is provided 6918/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6919/// the '{' brace. Otherwise, this linkage specification does not 6920/// have any braces. 6921Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6922 SourceLocation LangLoc, 6923 llvm::StringRef Lang, 6924 SourceLocation LBraceLoc) { 6925 LinkageSpecDecl::LanguageIDs Language; 6926 if (Lang == "\"C\"") 6927 Language = LinkageSpecDecl::lang_c; 6928 else if (Lang == "\"C++\"") 6929 Language = LinkageSpecDecl::lang_cxx; 6930 else { 6931 Diag(LangLoc, diag::err_bad_language); 6932 return 0; 6933 } 6934 6935 // FIXME: Add all the various semantics of linkage specifications 6936 6937 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6938 ExternLoc, LangLoc, Language); 6939 CurContext->addDecl(D); 6940 PushDeclContext(S, D); 6941 return D; 6942} 6943 6944/// ActOnFinishLinkageSpecification - Complete the definition of 6945/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6946/// valid, it's the position of the closing '}' brace in a linkage 6947/// specification that uses braces. 6948Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6949 Decl *LinkageSpec, 6950 SourceLocation RBraceLoc) { 6951 if (LinkageSpec) { 6952 if (RBraceLoc.isValid()) { 6953 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6954 LSDecl->setRBraceLoc(RBraceLoc); 6955 } 6956 PopDeclContext(); 6957 } 6958 return LinkageSpec; 6959} 6960 6961/// \brief Perform semantic analysis for the variable declaration that 6962/// occurs within a C++ catch clause, returning the newly-created 6963/// variable. 6964VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6965 TypeSourceInfo *TInfo, 6966 SourceLocation StartLoc, 6967 SourceLocation Loc, 6968 IdentifierInfo *Name) { 6969 bool Invalid = false; 6970 QualType ExDeclType = TInfo->getType(); 6971 6972 // Arrays and functions decay. 6973 if (ExDeclType->isArrayType()) 6974 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6975 else if (ExDeclType->isFunctionType()) 6976 ExDeclType = Context.getPointerType(ExDeclType); 6977 6978 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6979 // The exception-declaration shall not denote a pointer or reference to an 6980 // incomplete type, other than [cv] void*. 6981 // N2844 forbids rvalue references. 6982 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6983 Diag(Loc, diag::err_catch_rvalue_ref); 6984 Invalid = true; 6985 } 6986 6987 // GCC allows catching pointers and references to incomplete types 6988 // as an extension; so do we, but we warn by default. 6989 6990 QualType BaseType = ExDeclType; 6991 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6992 unsigned DK = diag::err_catch_incomplete; 6993 bool IncompleteCatchIsInvalid = true; 6994 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6995 BaseType = Ptr->getPointeeType(); 6996 Mode = 1; 6997 DK = diag::ext_catch_incomplete_ptr; 6998 IncompleteCatchIsInvalid = false; 6999 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7000 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7001 BaseType = Ref->getPointeeType(); 7002 Mode = 2; 7003 DK = diag::ext_catch_incomplete_ref; 7004 IncompleteCatchIsInvalid = false; 7005 } 7006 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7007 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7008 IncompleteCatchIsInvalid) 7009 Invalid = true; 7010 7011 if (!Invalid && !ExDeclType->isDependentType() && 7012 RequireNonAbstractType(Loc, ExDeclType, 7013 diag::err_abstract_type_in_decl, 7014 AbstractVariableType)) 7015 Invalid = true; 7016 7017 // Only the non-fragile NeXT runtime currently supports C++ catches 7018 // of ObjC types, and no runtime supports catching ObjC types by value. 7019 if (!Invalid && getLangOptions().ObjC1) { 7020 QualType T = ExDeclType; 7021 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7022 T = RT->getPointeeType(); 7023 7024 if (T->isObjCObjectType()) { 7025 Diag(Loc, diag::err_objc_object_catch); 7026 Invalid = true; 7027 } else if (T->isObjCObjectPointerType()) { 7028 if (!getLangOptions().ObjCNonFragileABI) { 7029 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7030 Invalid = true; 7031 } 7032 } 7033 } 7034 7035 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7036 ExDeclType, TInfo, SC_None, SC_None); 7037 ExDecl->setExceptionVariable(true); 7038 7039 if (!Invalid) { 7040 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7041 // C++ [except.handle]p16: 7042 // The object declared in an exception-declaration or, if the 7043 // exception-declaration does not specify a name, a temporary (12.2) is 7044 // copy-initialized (8.5) from the exception object. [...] 7045 // The object is destroyed when the handler exits, after the destruction 7046 // of any automatic objects initialized within the handler. 7047 // 7048 // We just pretend to initialize the object with itself, then make sure 7049 // it can be destroyed later. 7050 QualType initType = ExDeclType; 7051 7052 InitializedEntity entity = 7053 InitializedEntity::InitializeVariable(ExDecl); 7054 InitializationKind initKind = 7055 InitializationKind::CreateCopy(Loc, SourceLocation()); 7056 7057 Expr *opaqueValue = 7058 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 7059 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 7060 ExprResult result = sequence.Perform(*this, entity, initKind, 7061 MultiExprArg(&opaqueValue, 1)); 7062 if (result.isInvalid()) 7063 Invalid = true; 7064 else { 7065 // If the constructor used was non-trivial, set this as the 7066 // "initializer". 7067 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 7068 if (!construct->getConstructor()->isTrivial()) { 7069 Expr *init = MaybeCreateExprWithCleanups(construct); 7070 ExDecl->setInit(init); 7071 } 7072 7073 // And make sure it's destructable. 7074 FinalizeVarWithDestructor(ExDecl, recordType); 7075 } 7076 } 7077 } 7078 7079 if (Invalid) 7080 ExDecl->setInvalidDecl(); 7081 7082 return ExDecl; 7083} 7084 7085/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7086/// handler. 7087Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7088 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7089 bool Invalid = D.isInvalidType(); 7090 7091 // Check for unexpanded parameter packs. 7092 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7093 UPPC_ExceptionType)) { 7094 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7095 D.getIdentifierLoc()); 7096 Invalid = true; 7097 } 7098 7099 IdentifierInfo *II = D.getIdentifier(); 7100 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7101 LookupOrdinaryName, 7102 ForRedeclaration)) { 7103 // The scope should be freshly made just for us. There is just no way 7104 // it contains any previous declaration. 7105 assert(!S->isDeclScope(PrevDecl)); 7106 if (PrevDecl->isTemplateParameter()) { 7107 // Maybe we will complain about the shadowed template parameter. 7108 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7109 } 7110 } 7111 7112 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7113 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7114 << D.getCXXScopeSpec().getRange(); 7115 Invalid = true; 7116 } 7117 7118 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7119 D.getSourceRange().getBegin(), 7120 D.getIdentifierLoc(), 7121 D.getIdentifier()); 7122 if (Invalid) 7123 ExDecl->setInvalidDecl(); 7124 7125 // Add the exception declaration into this scope. 7126 if (II) 7127 PushOnScopeChains(ExDecl, S); 7128 else 7129 CurContext->addDecl(ExDecl); 7130 7131 ProcessDeclAttributes(S, ExDecl, D); 7132 return ExDecl; 7133} 7134 7135Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7136 Expr *AssertExpr, 7137 Expr *AssertMessageExpr_, 7138 SourceLocation RParenLoc) { 7139 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7140 7141 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7142 llvm::APSInt Value(32); 7143 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7144 Diag(StaticAssertLoc, 7145 diag::err_static_assert_expression_is_not_constant) << 7146 AssertExpr->getSourceRange(); 7147 return 0; 7148 } 7149 7150 if (Value == 0) { 7151 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7152 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7153 } 7154 } 7155 7156 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7157 return 0; 7158 7159 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7160 AssertExpr, AssertMessage, RParenLoc); 7161 7162 CurContext->addDecl(Decl); 7163 return Decl; 7164} 7165 7166/// \brief Perform semantic analysis of the given friend type declaration. 7167/// 7168/// \returns A friend declaration that. 7169FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7170 TypeSourceInfo *TSInfo) { 7171 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7172 7173 QualType T = TSInfo->getType(); 7174 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7175 7176 if (!getLangOptions().CPlusPlus0x) { 7177 // C++03 [class.friend]p2: 7178 // An elaborated-type-specifier shall be used in a friend declaration 7179 // for a class.* 7180 // 7181 // * The class-key of the elaborated-type-specifier is required. 7182 if (!ActiveTemplateInstantiations.empty()) { 7183 // Do not complain about the form of friend template types during 7184 // template instantiation; we will already have complained when the 7185 // template was declared. 7186 } else if (!T->isElaboratedTypeSpecifier()) { 7187 // If we evaluated the type to a record type, suggest putting 7188 // a tag in front. 7189 if (const RecordType *RT = T->getAs<RecordType>()) { 7190 RecordDecl *RD = RT->getDecl(); 7191 7192 std::string InsertionText = std::string(" ") + RD->getKindName(); 7193 7194 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7195 << (unsigned) RD->getTagKind() 7196 << T 7197 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7198 InsertionText); 7199 } else { 7200 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7201 << T 7202 << SourceRange(FriendLoc, TypeRange.getEnd()); 7203 } 7204 } else if (T->getAs<EnumType>()) { 7205 Diag(FriendLoc, diag::ext_enum_friend) 7206 << T 7207 << SourceRange(FriendLoc, TypeRange.getEnd()); 7208 } 7209 } 7210 7211 // C++0x [class.friend]p3: 7212 // If the type specifier in a friend declaration designates a (possibly 7213 // cv-qualified) class type, that class is declared as a friend; otherwise, 7214 // the friend declaration is ignored. 7215 7216 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7217 // in [class.friend]p3 that we do not implement. 7218 7219 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7220} 7221 7222/// Handle a friend tag declaration where the scope specifier was 7223/// templated. 7224Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7225 unsigned TagSpec, SourceLocation TagLoc, 7226 CXXScopeSpec &SS, 7227 IdentifierInfo *Name, SourceLocation NameLoc, 7228 AttributeList *Attr, 7229 MultiTemplateParamsArg TempParamLists) { 7230 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7231 7232 bool isExplicitSpecialization = false; 7233 bool Invalid = false; 7234 7235 if (TemplateParameterList *TemplateParams 7236 = MatchTemplateParametersToScopeSpecifier(TagLoc, SS, 7237 TempParamLists.get(), 7238 TempParamLists.size(), 7239 /*friend*/ true, 7240 isExplicitSpecialization, 7241 Invalid)) { 7242 if (TemplateParams->size() > 0) { 7243 // This is a declaration of a class template. 7244 if (Invalid) 7245 return 0; 7246 7247 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7248 SS, Name, NameLoc, Attr, 7249 TemplateParams, AS_public, 7250 TempParamLists.size() - 1, 7251 (TemplateParameterList**) TempParamLists.release()).take(); 7252 } else { 7253 // The "template<>" header is extraneous. 7254 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7255 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7256 isExplicitSpecialization = true; 7257 } 7258 } 7259 7260 if (Invalid) return 0; 7261 7262 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7263 7264 bool isAllExplicitSpecializations = true; 7265 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7266 if (TempParamLists.get()[I]->size()) { 7267 isAllExplicitSpecializations = false; 7268 break; 7269 } 7270 } 7271 7272 // FIXME: don't ignore attributes. 7273 7274 // If it's explicit specializations all the way down, just forget 7275 // about the template header and build an appropriate non-templated 7276 // friend. TODO: for source fidelity, remember the headers. 7277 if (isAllExplicitSpecializations) { 7278 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7279 ElaboratedTypeKeyword Keyword 7280 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7281 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7282 *Name, NameLoc); 7283 if (T.isNull()) 7284 return 0; 7285 7286 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7287 if (isa<DependentNameType>(T)) { 7288 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7289 TL.setKeywordLoc(TagLoc); 7290 TL.setQualifierLoc(QualifierLoc); 7291 TL.setNameLoc(NameLoc); 7292 } else { 7293 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7294 TL.setKeywordLoc(TagLoc); 7295 TL.setQualifierLoc(QualifierLoc); 7296 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7297 } 7298 7299 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7300 TSI, FriendLoc); 7301 Friend->setAccess(AS_public); 7302 CurContext->addDecl(Friend); 7303 return Friend; 7304 } 7305 7306 // Handle the case of a templated-scope friend class. e.g. 7307 // template <class T> class A<T>::B; 7308 // FIXME: we don't support these right now. 7309 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7310 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7311 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7312 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7313 TL.setKeywordLoc(TagLoc); 7314 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7315 TL.setNameLoc(NameLoc); 7316 7317 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7318 TSI, FriendLoc); 7319 Friend->setAccess(AS_public); 7320 Friend->setUnsupportedFriend(true); 7321 CurContext->addDecl(Friend); 7322 return Friend; 7323} 7324 7325 7326/// Handle a friend type declaration. This works in tandem with 7327/// ActOnTag. 7328/// 7329/// Notes on friend class templates: 7330/// 7331/// We generally treat friend class declarations as if they were 7332/// declaring a class. So, for example, the elaborated type specifier 7333/// in a friend declaration is required to obey the restrictions of a 7334/// class-head (i.e. no typedefs in the scope chain), template 7335/// parameters are required to match up with simple template-ids, &c. 7336/// However, unlike when declaring a template specialization, it's 7337/// okay to refer to a template specialization without an empty 7338/// template parameter declaration, e.g. 7339/// friend class A<T>::B<unsigned>; 7340/// We permit this as a special case; if there are any template 7341/// parameters present at all, require proper matching, i.e. 7342/// template <> template <class T> friend class A<int>::B; 7343Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7344 MultiTemplateParamsArg TempParams) { 7345 SourceLocation Loc = DS.getSourceRange().getBegin(); 7346 7347 assert(DS.isFriendSpecified()); 7348 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7349 7350 // Try to convert the decl specifier to a type. This works for 7351 // friend templates because ActOnTag never produces a ClassTemplateDecl 7352 // for a TUK_Friend. 7353 Declarator TheDeclarator(DS, Declarator::MemberContext); 7354 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7355 QualType T = TSI->getType(); 7356 if (TheDeclarator.isInvalidType()) 7357 return 0; 7358 7359 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7360 return 0; 7361 7362 // This is definitely an error in C++98. It's probably meant to 7363 // be forbidden in C++0x, too, but the specification is just 7364 // poorly written. 7365 // 7366 // The problem is with declarations like the following: 7367 // template <T> friend A<T>::foo; 7368 // where deciding whether a class C is a friend or not now hinges 7369 // on whether there exists an instantiation of A that causes 7370 // 'foo' to equal C. There are restrictions on class-heads 7371 // (which we declare (by fiat) elaborated friend declarations to 7372 // be) that makes this tractable. 7373 // 7374 // FIXME: handle "template <> friend class A<T>;", which 7375 // is possibly well-formed? Who even knows? 7376 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7377 Diag(Loc, diag::err_tagless_friend_type_template) 7378 << DS.getSourceRange(); 7379 return 0; 7380 } 7381 7382 // C++98 [class.friend]p1: A friend of a class is a function 7383 // or class that is not a member of the class . . . 7384 // This is fixed in DR77, which just barely didn't make the C++03 7385 // deadline. It's also a very silly restriction that seriously 7386 // affects inner classes and which nobody else seems to implement; 7387 // thus we never diagnose it, not even in -pedantic. 7388 // 7389 // But note that we could warn about it: it's always useless to 7390 // friend one of your own members (it's not, however, worthless to 7391 // friend a member of an arbitrary specialization of your template). 7392 7393 Decl *D; 7394 if (unsigned NumTempParamLists = TempParams.size()) 7395 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7396 NumTempParamLists, 7397 TempParams.release(), 7398 TSI, 7399 DS.getFriendSpecLoc()); 7400 else 7401 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7402 7403 if (!D) 7404 return 0; 7405 7406 D->setAccess(AS_public); 7407 CurContext->addDecl(D); 7408 7409 return D; 7410} 7411 7412Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7413 MultiTemplateParamsArg TemplateParams) { 7414 const DeclSpec &DS = D.getDeclSpec(); 7415 7416 assert(DS.isFriendSpecified()); 7417 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7418 7419 SourceLocation Loc = D.getIdentifierLoc(); 7420 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7421 QualType T = TInfo->getType(); 7422 7423 // C++ [class.friend]p1 7424 // A friend of a class is a function or class.... 7425 // Note that this sees through typedefs, which is intended. 7426 // It *doesn't* see through dependent types, which is correct 7427 // according to [temp.arg.type]p3: 7428 // If a declaration acquires a function type through a 7429 // type dependent on a template-parameter and this causes 7430 // a declaration that does not use the syntactic form of a 7431 // function declarator to have a function type, the program 7432 // is ill-formed. 7433 if (!T->isFunctionType()) { 7434 Diag(Loc, diag::err_unexpected_friend); 7435 7436 // It might be worthwhile to try to recover by creating an 7437 // appropriate declaration. 7438 return 0; 7439 } 7440 7441 // C++ [namespace.memdef]p3 7442 // - If a friend declaration in a non-local class first declares a 7443 // class or function, the friend class or function is a member 7444 // of the innermost enclosing namespace. 7445 // - The name of the friend is not found by simple name lookup 7446 // until a matching declaration is provided in that namespace 7447 // scope (either before or after the class declaration granting 7448 // friendship). 7449 // - If a friend function is called, its name may be found by the 7450 // name lookup that considers functions from namespaces and 7451 // classes associated with the types of the function arguments. 7452 // - When looking for a prior declaration of a class or a function 7453 // declared as a friend, scopes outside the innermost enclosing 7454 // namespace scope are not considered. 7455 7456 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7457 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7458 DeclarationName Name = NameInfo.getName(); 7459 assert(Name); 7460 7461 // Check for unexpanded parameter packs. 7462 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7463 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7464 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7465 return 0; 7466 7467 // The context we found the declaration in, or in which we should 7468 // create the declaration. 7469 DeclContext *DC; 7470 Scope *DCScope = S; 7471 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7472 ForRedeclaration); 7473 7474 // FIXME: there are different rules in local classes 7475 7476 // There are four cases here. 7477 // - There's no scope specifier, in which case we just go to the 7478 // appropriate scope and look for a function or function template 7479 // there as appropriate. 7480 // Recover from invalid scope qualifiers as if they just weren't there. 7481 if (SS.isInvalid() || !SS.isSet()) { 7482 // C++0x [namespace.memdef]p3: 7483 // If the name in a friend declaration is neither qualified nor 7484 // a template-id and the declaration is a function or an 7485 // elaborated-type-specifier, the lookup to determine whether 7486 // the entity has been previously declared shall not consider 7487 // any scopes outside the innermost enclosing namespace. 7488 // C++0x [class.friend]p11: 7489 // If a friend declaration appears in a local class and the name 7490 // specified is an unqualified name, a prior declaration is 7491 // looked up without considering scopes that are outside the 7492 // innermost enclosing non-class scope. For a friend function 7493 // declaration, if there is no prior declaration, the program is 7494 // ill-formed. 7495 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7496 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7497 7498 // Find the appropriate context according to the above. 7499 DC = CurContext; 7500 while (true) { 7501 // Skip class contexts. If someone can cite chapter and verse 7502 // for this behavior, that would be nice --- it's what GCC and 7503 // EDG do, and it seems like a reasonable intent, but the spec 7504 // really only says that checks for unqualified existing 7505 // declarations should stop at the nearest enclosing namespace, 7506 // not that they should only consider the nearest enclosing 7507 // namespace. 7508 while (DC->isRecord()) 7509 DC = DC->getParent(); 7510 7511 LookupQualifiedName(Previous, DC); 7512 7513 // TODO: decide what we think about using declarations. 7514 if (isLocal || !Previous.empty()) 7515 break; 7516 7517 if (isTemplateId) { 7518 if (isa<TranslationUnitDecl>(DC)) break; 7519 } else { 7520 if (DC->isFileContext()) break; 7521 } 7522 DC = DC->getParent(); 7523 } 7524 7525 // C++ [class.friend]p1: A friend of a class is a function or 7526 // class that is not a member of the class . . . 7527 // C++0x changes this for both friend types and functions. 7528 // Most C++ 98 compilers do seem to give an error here, so 7529 // we do, too. 7530 if (!Previous.empty() && DC->Equals(CurContext) 7531 && !getLangOptions().CPlusPlus0x) 7532 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7533 7534 DCScope = getScopeForDeclContext(S, DC); 7535 7536 // - There's a non-dependent scope specifier, in which case we 7537 // compute it and do a previous lookup there for a function 7538 // or function template. 7539 } else if (!SS.getScopeRep()->isDependent()) { 7540 DC = computeDeclContext(SS); 7541 if (!DC) return 0; 7542 7543 if (RequireCompleteDeclContext(SS, DC)) return 0; 7544 7545 LookupQualifiedName(Previous, DC); 7546 7547 // Ignore things found implicitly in the wrong scope. 7548 // TODO: better diagnostics for this case. Suggesting the right 7549 // qualified scope would be nice... 7550 LookupResult::Filter F = Previous.makeFilter(); 7551 while (F.hasNext()) { 7552 NamedDecl *D = F.next(); 7553 if (!DC->InEnclosingNamespaceSetOf( 7554 D->getDeclContext()->getRedeclContext())) 7555 F.erase(); 7556 } 7557 F.done(); 7558 7559 if (Previous.empty()) { 7560 D.setInvalidType(); 7561 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7562 return 0; 7563 } 7564 7565 // C++ [class.friend]p1: A friend of a class is a function or 7566 // class that is not a member of the class . . . 7567 if (DC->Equals(CurContext)) 7568 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7569 7570 // - There's a scope specifier that does not match any template 7571 // parameter lists, in which case we use some arbitrary context, 7572 // create a method or method template, and wait for instantiation. 7573 // - There's a scope specifier that does match some template 7574 // parameter lists, which we don't handle right now. 7575 } else { 7576 DC = CurContext; 7577 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7578 } 7579 7580 if (!DC->isRecord()) { 7581 // This implies that it has to be an operator or function. 7582 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7583 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7584 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7585 Diag(Loc, diag::err_introducing_special_friend) << 7586 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7587 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7588 return 0; 7589 } 7590 } 7591 7592 bool Redeclaration = false; 7593 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7594 move(TemplateParams), 7595 IsDefinition, 7596 Redeclaration); 7597 if (!ND) return 0; 7598 7599 assert(ND->getDeclContext() == DC); 7600 assert(ND->getLexicalDeclContext() == CurContext); 7601 7602 // Add the function declaration to the appropriate lookup tables, 7603 // adjusting the redeclarations list as necessary. We don't 7604 // want to do this yet if the friending class is dependent. 7605 // 7606 // Also update the scope-based lookup if the target context's 7607 // lookup context is in lexical scope. 7608 if (!CurContext->isDependentContext()) { 7609 DC = DC->getRedeclContext(); 7610 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7611 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7612 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7613 } 7614 7615 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7616 D.getIdentifierLoc(), ND, 7617 DS.getFriendSpecLoc()); 7618 FrD->setAccess(AS_public); 7619 CurContext->addDecl(FrD); 7620 7621 if (ND->isInvalidDecl()) 7622 FrD->setInvalidDecl(); 7623 else { 7624 FunctionDecl *FD; 7625 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7626 FD = FTD->getTemplatedDecl(); 7627 else 7628 FD = cast<FunctionDecl>(ND); 7629 7630 // Mark templated-scope function declarations as unsupported. 7631 if (FD->getNumTemplateParameterLists()) 7632 FrD->setUnsupportedFriend(true); 7633 } 7634 7635 return ND; 7636} 7637 7638void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7639 AdjustDeclIfTemplate(Dcl); 7640 7641 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7642 if (!Fn) { 7643 Diag(DelLoc, diag::err_deleted_non_function); 7644 return; 7645 } 7646 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7647 Diag(DelLoc, diag::err_deleted_decl_not_first); 7648 Diag(Prev->getLocation(), diag::note_previous_declaration); 7649 // If the declaration wasn't the first, we delete the function anyway for 7650 // recovery. 7651 } 7652 Fn->setDeleted(); 7653} 7654 7655static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7656 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7657 Stmt *SubStmt = *CI; 7658 if (!SubStmt) 7659 continue; 7660 if (isa<ReturnStmt>(SubStmt)) 7661 Self.Diag(SubStmt->getSourceRange().getBegin(), 7662 diag::err_return_in_constructor_handler); 7663 if (!isa<Expr>(SubStmt)) 7664 SearchForReturnInStmt(Self, SubStmt); 7665 } 7666} 7667 7668void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7669 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7670 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7671 SearchForReturnInStmt(*this, Handler); 7672 } 7673} 7674 7675bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7676 const CXXMethodDecl *Old) { 7677 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7678 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7679 7680 if (Context.hasSameType(NewTy, OldTy) || 7681 NewTy->isDependentType() || OldTy->isDependentType()) 7682 return false; 7683 7684 // Check if the return types are covariant 7685 QualType NewClassTy, OldClassTy; 7686 7687 /// Both types must be pointers or references to classes. 7688 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7689 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7690 NewClassTy = NewPT->getPointeeType(); 7691 OldClassTy = OldPT->getPointeeType(); 7692 } 7693 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7694 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7695 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7696 NewClassTy = NewRT->getPointeeType(); 7697 OldClassTy = OldRT->getPointeeType(); 7698 } 7699 } 7700 } 7701 7702 // The return types aren't either both pointers or references to a class type. 7703 if (NewClassTy.isNull()) { 7704 Diag(New->getLocation(), 7705 diag::err_different_return_type_for_overriding_virtual_function) 7706 << New->getDeclName() << NewTy << OldTy; 7707 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7708 7709 return true; 7710 } 7711 7712 // C++ [class.virtual]p6: 7713 // If the return type of D::f differs from the return type of B::f, the 7714 // class type in the return type of D::f shall be complete at the point of 7715 // declaration of D::f or shall be the class type D. 7716 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7717 if (!RT->isBeingDefined() && 7718 RequireCompleteType(New->getLocation(), NewClassTy, 7719 PDiag(diag::err_covariant_return_incomplete) 7720 << New->getDeclName())) 7721 return true; 7722 } 7723 7724 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7725 // Check if the new class derives from the old class. 7726 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7727 Diag(New->getLocation(), 7728 diag::err_covariant_return_not_derived) 7729 << New->getDeclName() << NewTy << OldTy; 7730 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7731 return true; 7732 } 7733 7734 // Check if we the conversion from derived to base is valid. 7735 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7736 diag::err_covariant_return_inaccessible_base, 7737 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7738 // FIXME: Should this point to the return type? 7739 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7740 // FIXME: this note won't trigger for delayed access control 7741 // diagnostics, and it's impossible to get an undelayed error 7742 // here from access control during the original parse because 7743 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7744 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7745 return true; 7746 } 7747 } 7748 7749 // The qualifiers of the return types must be the same. 7750 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7751 Diag(New->getLocation(), 7752 diag::err_covariant_return_type_different_qualifications) 7753 << New->getDeclName() << NewTy << OldTy; 7754 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7755 return true; 7756 }; 7757 7758 7759 // The new class type must have the same or less qualifiers as the old type. 7760 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7761 Diag(New->getLocation(), 7762 diag::err_covariant_return_type_class_type_more_qualified) 7763 << New->getDeclName() << NewTy << OldTy; 7764 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7765 return true; 7766 }; 7767 7768 return false; 7769} 7770 7771/// \brief Mark the given method pure. 7772/// 7773/// \param Method the method to be marked pure. 7774/// 7775/// \param InitRange the source range that covers the "0" initializer. 7776bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7777 SourceLocation EndLoc = InitRange.getEnd(); 7778 if (EndLoc.isValid()) 7779 Method->setRangeEnd(EndLoc); 7780 7781 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7782 Method->setPure(); 7783 return false; 7784 } 7785 7786 if (!Method->isInvalidDecl()) 7787 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7788 << Method->getDeclName() << InitRange; 7789 return true; 7790} 7791 7792/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7793/// an initializer for the out-of-line declaration 'Dcl'. The scope 7794/// is a fresh scope pushed for just this purpose. 7795/// 7796/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7797/// static data member of class X, names should be looked up in the scope of 7798/// class X. 7799void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7800 // If there is no declaration, there was an error parsing it. 7801 if (D == 0 || D->isInvalidDecl()) return; 7802 7803 // We should only get called for declarations with scope specifiers, like: 7804 // int foo::bar; 7805 assert(D->isOutOfLine()); 7806 EnterDeclaratorContext(S, D->getDeclContext()); 7807} 7808 7809/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7810/// initializer for the out-of-line declaration 'D'. 7811void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7812 // If there is no declaration, there was an error parsing it. 7813 if (D == 0 || D->isInvalidDecl()) return; 7814 7815 assert(D->isOutOfLine()); 7816 ExitDeclaratorContext(S); 7817} 7818 7819/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7820/// C++ if/switch/while/for statement. 7821/// e.g: "if (int x = f()) {...}" 7822DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7823 // C++ 6.4p2: 7824 // The declarator shall not specify a function or an array. 7825 // The type-specifier-seq shall not contain typedef and shall not declare a 7826 // new class or enumeration. 7827 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7828 "Parser allowed 'typedef' as storage class of condition decl."); 7829 7830 TagDecl *OwnedTag = 0; 7831 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7832 QualType Ty = TInfo->getType(); 7833 7834 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7835 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7836 // would be created and CXXConditionDeclExpr wants a VarDecl. 7837 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7838 << D.getSourceRange(); 7839 return DeclResult(); 7840 } else if (OwnedTag && OwnedTag->isDefinition()) { 7841 // The type-specifier-seq shall not declare a new class or enumeration. 7842 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7843 } 7844 7845 Decl *Dcl = ActOnDeclarator(S, D); 7846 if (!Dcl) 7847 return DeclResult(); 7848 7849 return Dcl; 7850} 7851 7852void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7853 bool DefinitionRequired) { 7854 // Ignore any vtable uses in unevaluated operands or for classes that do 7855 // not have a vtable. 7856 if (!Class->isDynamicClass() || Class->isDependentContext() || 7857 CurContext->isDependentContext() || 7858 ExprEvalContexts.back().Context == Unevaluated) 7859 return; 7860 7861 // Try to insert this class into the map. 7862 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7863 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7864 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7865 if (!Pos.second) { 7866 // If we already had an entry, check to see if we are promoting this vtable 7867 // to required a definition. If so, we need to reappend to the VTableUses 7868 // list, since we may have already processed the first entry. 7869 if (DefinitionRequired && !Pos.first->second) { 7870 Pos.first->second = true; 7871 } else { 7872 // Otherwise, we can early exit. 7873 return; 7874 } 7875 } 7876 7877 // Local classes need to have their virtual members marked 7878 // immediately. For all other classes, we mark their virtual members 7879 // at the end of the translation unit. 7880 if (Class->isLocalClass()) 7881 MarkVirtualMembersReferenced(Loc, Class); 7882 else 7883 VTableUses.push_back(std::make_pair(Class, Loc)); 7884} 7885 7886bool Sema::DefineUsedVTables() { 7887 if (VTableUses.empty()) 7888 return false; 7889 7890 // Note: The VTableUses vector could grow as a result of marking 7891 // the members of a class as "used", so we check the size each 7892 // time through the loop and prefer indices (with are stable) to 7893 // iterators (which are not). 7894 bool DefinedAnything = false; 7895 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7896 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7897 if (!Class) 7898 continue; 7899 7900 SourceLocation Loc = VTableUses[I].second; 7901 7902 // If this class has a key function, but that key function is 7903 // defined in another translation unit, we don't need to emit the 7904 // vtable even though we're using it. 7905 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7906 if (KeyFunction && !KeyFunction->hasBody()) { 7907 switch (KeyFunction->getTemplateSpecializationKind()) { 7908 case TSK_Undeclared: 7909 case TSK_ExplicitSpecialization: 7910 case TSK_ExplicitInstantiationDeclaration: 7911 // The key function is in another translation unit. 7912 continue; 7913 7914 case TSK_ExplicitInstantiationDefinition: 7915 case TSK_ImplicitInstantiation: 7916 // We will be instantiating the key function. 7917 break; 7918 } 7919 } else if (!KeyFunction) { 7920 // If we have a class with no key function that is the subject 7921 // of an explicit instantiation declaration, suppress the 7922 // vtable; it will live with the explicit instantiation 7923 // definition. 7924 bool IsExplicitInstantiationDeclaration 7925 = Class->getTemplateSpecializationKind() 7926 == TSK_ExplicitInstantiationDeclaration; 7927 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7928 REnd = Class->redecls_end(); 7929 R != REnd; ++R) { 7930 TemplateSpecializationKind TSK 7931 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7932 if (TSK == TSK_ExplicitInstantiationDeclaration) 7933 IsExplicitInstantiationDeclaration = true; 7934 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7935 IsExplicitInstantiationDeclaration = false; 7936 break; 7937 } 7938 } 7939 7940 if (IsExplicitInstantiationDeclaration) 7941 continue; 7942 } 7943 7944 // Mark all of the virtual members of this class as referenced, so 7945 // that we can build a vtable. Then, tell the AST consumer that a 7946 // vtable for this class is required. 7947 DefinedAnything = true; 7948 MarkVirtualMembersReferenced(Loc, Class); 7949 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7950 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7951 7952 // Optionally warn if we're emitting a weak vtable. 7953 if (Class->getLinkage() == ExternalLinkage && 7954 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7955 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7956 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7957 } 7958 } 7959 VTableUses.clear(); 7960 7961 return DefinedAnything; 7962} 7963 7964void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7965 const CXXRecordDecl *RD) { 7966 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7967 e = RD->method_end(); i != e; ++i) { 7968 CXXMethodDecl *MD = *i; 7969 7970 // C++ [basic.def.odr]p2: 7971 // [...] A virtual member function is used if it is not pure. [...] 7972 if (MD->isVirtual() && !MD->isPure()) 7973 MarkDeclarationReferenced(Loc, MD); 7974 } 7975 7976 // Only classes that have virtual bases need a VTT. 7977 if (RD->getNumVBases() == 0) 7978 return; 7979 7980 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 7981 e = RD->bases_end(); i != e; ++i) { 7982 const CXXRecordDecl *Base = 7983 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 7984 if (Base->getNumVBases() == 0) 7985 continue; 7986 MarkVirtualMembersReferenced(Loc, Base); 7987 } 7988} 7989 7990/// SetIvarInitializers - This routine builds initialization ASTs for the 7991/// Objective-C implementation whose ivars need be initialized. 7992void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 7993 if (!getLangOptions().CPlusPlus) 7994 return; 7995 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 7996 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 7997 CollectIvarsToConstructOrDestruct(OID, ivars); 7998 if (ivars.empty()) 7999 return; 8000 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 8001 for (unsigned i = 0; i < ivars.size(); i++) { 8002 FieldDecl *Field = ivars[i]; 8003 if (Field->isInvalidDecl()) 8004 continue; 8005 8006 CXXCtorInitializer *Member; 8007 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 8008 InitializationKind InitKind = 8009 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 8010 8011 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 8012 ExprResult MemberInit = 8013 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 8014 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 8015 // Note, MemberInit could actually come back empty if no initialization 8016 // is required (e.g., because it would call a trivial default constructor) 8017 if (!MemberInit.get() || MemberInit.isInvalid()) 8018 continue; 8019 8020 Member = 8021 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 8022 SourceLocation(), 8023 MemberInit.takeAs<Expr>(), 8024 SourceLocation()); 8025 AllToInit.push_back(Member); 8026 8027 // Be sure that the destructor is accessible and is marked as referenced. 8028 if (const RecordType *RecordTy 8029 = Context.getBaseElementType(Field->getType()) 8030 ->getAs<RecordType>()) { 8031 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 8032 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 8033 MarkDeclarationReferenced(Field->getLocation(), Destructor); 8034 CheckDestructorAccess(Field->getLocation(), Destructor, 8035 PDiag(diag::err_access_dtor_ivar) 8036 << Context.getBaseElementType(Field->getType())); 8037 } 8038 } 8039 } 8040 ObjCImplementation->setIvarInitializers(Context, 8041 AllToInit.data(), AllToInit.size()); 8042 } 8043} 8044 8045static 8046void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 8047 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 8048 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 8049 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 8050 Sema &S) { 8051 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8052 CE = Current.end(); 8053 if (Ctor->isInvalidDecl()) 8054 return; 8055 8056 const FunctionDecl *FNTarget = 0; 8057 CXXConstructorDecl *Target; 8058 8059 // We ignore the result here since if we don't have a body, Target will be 8060 // null below. 8061 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 8062 Target 8063= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 8064 8065 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 8066 // Avoid dereferencing a null pointer here. 8067 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 8068 8069 if (!Current.insert(Canonical)) 8070 return; 8071 8072 // We know that beyond here, we aren't chaining into a cycle. 8073 if (!Target || !Target->isDelegatingConstructor() || 8074 Target->isInvalidDecl() || Valid.count(TCanonical)) { 8075 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8076 Valid.insert(*CI); 8077 Current.clear(); 8078 // We've hit a cycle. 8079 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 8080 Current.count(TCanonical)) { 8081 // If we haven't diagnosed this cycle yet, do so now. 8082 if (!Invalid.count(TCanonical)) { 8083 S.Diag((*Ctor->init_begin())->getSourceLocation(), 8084 diag::warn_delegating_ctor_cycle) 8085 << Ctor; 8086 8087 // Don't add a note for a function delegating directo to itself. 8088 if (TCanonical != Canonical) 8089 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 8090 8091 CXXConstructorDecl *C = Target; 8092 while (C->getCanonicalDecl() != Canonical) { 8093 (void)C->getTargetConstructor()->hasBody(FNTarget); 8094 assert(FNTarget && "Ctor cycle through bodiless function"); 8095 8096 C 8097 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8098 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8099 } 8100 } 8101 8102 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8103 Invalid.insert(*CI); 8104 Current.clear(); 8105 } else { 8106 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8107 } 8108} 8109 8110 8111void Sema::CheckDelegatingCtorCycles() { 8112 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8113 8114 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8115 CE = Current.end(); 8116 8117 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8118 I = DelegatingCtorDecls.begin(), 8119 E = DelegatingCtorDecls.end(); 8120 I != E; ++I) { 8121 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8122 } 8123 8124 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8125 (*CI)->setInvalidDecl(); 8126} 8127