SemaDeclCXX.cpp revision f961ea5716867b5e426fb2136edd6d1f04c3a7ca
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 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 // If we have an MSAny spec already, don't bother. 116 if (!Method || ComputedEST == EST_MSAny) 117 return; 118 119 const FunctionProtoType *Proto 120 = Method->getType()->getAs<FunctionProtoType>(); 121 122 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 123 124 // If this function can throw any exceptions, make a note of that. 125 if (EST == EST_MSAny || EST == EST_None) { 126 ClearExceptions(); 127 ComputedEST = EST; 128 return; 129 } 130 131 // If this function has a basic noexcept, it doesn't affect the outcome. 132 if (EST == EST_BasicNoexcept) 133 return; 134 135 // If we have a throw-all spec at this point, ignore the function. 136 if (ComputedEST == EST_None) 137 return; 138 139 // If we're still at noexcept(true) and there's a nothrow() callee, 140 // change to that specification. 141 if (EST == EST_DynamicNone) { 142 if (ComputedEST == EST_BasicNoexcept) 143 ComputedEST = EST_DynamicNone; 144 return; 145 } 146 147 // Check out noexcept specs. 148 if (EST == EST_ComputedNoexcept) { 149 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(Context); 150 assert(NR != FunctionProtoType::NR_NoNoexcept && 151 "Must have noexcept result for EST_ComputedNoexcept."); 152 assert(NR != FunctionProtoType::NR_Dependent && 153 "Should not generate implicit declarations for dependent cases, " 154 "and don't know how to handle them anyway."); 155 156 // noexcept(false) -> no spec on the new function 157 if (NR == FunctionProtoType::NR_Throw) { 158 ClearExceptions(); 159 ComputedEST = EST_None; 160 } 161 // noexcept(true) won't change anything either. 162 return; 163 } 164 165 assert(EST == EST_Dynamic && "EST case not considered earlier."); 166 assert(ComputedEST != EST_None && 167 "Shouldn't collect exceptions when throw-all is guaranteed."); 168 ComputedEST = EST_Dynamic; 169 // Record the exceptions in this function's exception specification. 170 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 171 EEnd = Proto->exception_end(); 172 E != EEnd; ++E) 173 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 174 Exceptions.push_back(*E); 175} 176 177bool 178Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 179 SourceLocation EqualLoc) { 180 if (RequireCompleteType(Param->getLocation(), Param->getType(), 181 diag::err_typecheck_decl_incomplete_type)) { 182 Param->setInvalidDecl(); 183 return true; 184 } 185 186 // C++ [dcl.fct.default]p5 187 // A default argument expression is implicitly converted (clause 188 // 4) to the parameter type. The default argument expression has 189 // the same semantic constraints as the initializer expression in 190 // a declaration of a variable of the parameter type, using the 191 // copy-initialization semantics (8.5). 192 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 193 Param); 194 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 195 EqualLoc); 196 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 197 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 198 MultiExprArg(*this, &Arg, 1)); 199 if (Result.isInvalid()) 200 return true; 201 Arg = Result.takeAs<Expr>(); 202 203 CheckImplicitConversions(Arg, EqualLoc); 204 Arg = MaybeCreateExprWithCleanups(Arg); 205 206 // Okay: add the default argument to the parameter 207 Param->setDefaultArg(Arg); 208 209 // We have already instantiated this parameter; provide each of the 210 // instantiations with the uninstantiated default argument. 211 UnparsedDefaultArgInstantiationsMap::iterator InstPos 212 = UnparsedDefaultArgInstantiations.find(Param); 213 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 214 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 215 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 216 217 // We're done tracking this parameter's instantiations. 218 UnparsedDefaultArgInstantiations.erase(InstPos); 219 } 220 221 return false; 222} 223 224/// ActOnParamDefaultArgument - Check whether the default argument 225/// provided for a function parameter is well-formed. If so, attach it 226/// to the parameter declaration. 227void 228Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 229 Expr *DefaultArg) { 230 if (!param || !DefaultArg) 231 return; 232 233 ParmVarDecl *Param = cast<ParmVarDecl>(param); 234 UnparsedDefaultArgLocs.erase(Param); 235 236 // Default arguments are only permitted in C++ 237 if (!getLangOptions().CPlusPlus) { 238 Diag(EqualLoc, diag::err_param_default_argument) 239 << DefaultArg->getSourceRange(); 240 Param->setInvalidDecl(); 241 return; 242 } 243 244 // Check for unexpanded parameter packs. 245 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 246 Param->setInvalidDecl(); 247 return; 248 } 249 250 // Check that the default argument is well-formed 251 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 252 if (DefaultArgChecker.Visit(DefaultArg)) { 253 Param->setInvalidDecl(); 254 return; 255 } 256 257 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 258} 259 260/// ActOnParamUnparsedDefaultArgument - We've seen a default 261/// argument for a function parameter, but we can't parse it yet 262/// because we're inside a class definition. Note that this default 263/// argument will be parsed later. 264void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 265 SourceLocation EqualLoc, 266 SourceLocation ArgLoc) { 267 if (!param) 268 return; 269 270 ParmVarDecl *Param = cast<ParmVarDecl>(param); 271 if (Param) 272 Param->setUnparsedDefaultArg(); 273 274 UnparsedDefaultArgLocs[Param] = ArgLoc; 275} 276 277/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 278/// the default argument for the parameter param failed. 279void Sema::ActOnParamDefaultArgumentError(Decl *param) { 280 if (!param) 281 return; 282 283 ParmVarDecl *Param = cast<ParmVarDecl>(param); 284 285 Param->setInvalidDecl(); 286 287 UnparsedDefaultArgLocs.erase(Param); 288} 289 290/// CheckExtraCXXDefaultArguments - Check for any extra default 291/// arguments in the declarator, which is not a function declaration 292/// or definition and therefore is not permitted to have default 293/// arguments. This routine should be invoked for every declarator 294/// that is not a function declaration or definition. 295void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 296 // C++ [dcl.fct.default]p3 297 // A default argument expression shall be specified only in the 298 // parameter-declaration-clause of a function declaration or in a 299 // template-parameter (14.1). It shall not be specified for a 300 // parameter pack. If it is specified in a 301 // parameter-declaration-clause, it shall not occur within a 302 // declarator or abstract-declarator of a parameter-declaration. 303 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 304 DeclaratorChunk &chunk = D.getTypeObject(i); 305 if (chunk.Kind == DeclaratorChunk::Function) { 306 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 307 ParmVarDecl *Param = 308 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 309 if (Param->hasUnparsedDefaultArg()) { 310 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 311 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 312 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 313 delete Toks; 314 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 315 } else if (Param->getDefaultArg()) { 316 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 317 << Param->getDefaultArg()->getSourceRange(); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322 } 323} 324 325// MergeCXXFunctionDecl - Merge two declarations of the same C++ 326// function, once we already know that they have the same 327// type. Subroutine of MergeFunctionDecl. Returns true if there was an 328// error, false otherwise. 329bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 330 bool Invalid = false; 331 332 // C++ [dcl.fct.default]p4: 333 // For non-template functions, default arguments can be added in 334 // later declarations of a function in the same 335 // scope. Declarations in different scopes have completely 336 // distinct sets of default arguments. That is, declarations in 337 // inner scopes do not acquire default arguments from 338 // declarations in outer scopes, and vice versa. In a given 339 // function declaration, all parameters subsequent to a 340 // parameter with a default argument shall have default 341 // arguments supplied in this or previous declarations. A 342 // default argument shall not be redefined by a later 343 // declaration (not even to the same value). 344 // 345 // C++ [dcl.fct.default]p6: 346 // Except for member functions of class templates, the default arguments 347 // in a member function definition that appears outside of the class 348 // definition are added to the set of default arguments provided by the 349 // member function declaration in the class definition. 350 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 351 ParmVarDecl *OldParam = Old->getParamDecl(p); 352 ParmVarDecl *NewParam = New->getParamDecl(p); 353 354 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 355 356 unsigned DiagDefaultParamID = 357 diag::err_param_default_argument_redefinition; 358 359 // MSVC accepts that default parameters be redefined for member functions 360 // of template class. The new default parameter's value is ignored. 361 Invalid = true; 362 if (getLangOptions().Microsoft) { 363 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 364 if (MD && MD->getParent()->getDescribedClassTemplate()) { 365 // Merge the old default argument into the new parameter. 366 NewParam->setHasInheritedDefaultArg(); 367 if (OldParam->hasUninstantiatedDefaultArg()) 368 NewParam->setUninstantiatedDefaultArg( 369 OldParam->getUninstantiatedDefaultArg()); 370 else 371 NewParam->setDefaultArg(OldParam->getInit()); 372 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 373 Invalid = false; 374 } 375 } 376 377 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 378 // hint here. Alternatively, we could walk the type-source information 379 // for NewParam to find the last source location in the type... but it 380 // isn't worth the effort right now. This is the kind of test case that 381 // is hard to get right: 382 // int f(int); 383 // void g(int (*fp)(int) = f); 384 // void g(int (*fp)(int) = &f); 385 Diag(NewParam->getLocation(), DiagDefaultParamID) 386 << NewParam->getDefaultArgRange(); 387 388 // Look for the function declaration where the default argument was 389 // actually written, which may be a declaration prior to Old. 390 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 391 Older; Older = Older->getPreviousDeclaration()) { 392 if (!Older->getParamDecl(p)->hasDefaultArg()) 393 break; 394 395 OldParam = Older->getParamDecl(p); 396 } 397 398 Diag(OldParam->getLocation(), diag::note_previous_definition) 399 << OldParam->getDefaultArgRange(); 400 } else if (OldParam->hasDefaultArg()) { 401 // Merge the old default argument into the new parameter. 402 // It's important to use getInit() here; getDefaultArg() 403 // strips off any top-level ExprWithCleanups. 404 NewParam->setHasInheritedDefaultArg(); 405 if (OldParam->hasUninstantiatedDefaultArg()) 406 NewParam->setUninstantiatedDefaultArg( 407 OldParam->getUninstantiatedDefaultArg()); 408 else 409 NewParam->setDefaultArg(OldParam->getInit()); 410 } else if (NewParam->hasDefaultArg()) { 411 if (New->getDescribedFunctionTemplate()) { 412 // Paragraph 4, quoted above, only applies to non-template functions. 413 Diag(NewParam->getLocation(), 414 diag::err_param_default_argument_template_redecl) 415 << NewParam->getDefaultArgRange(); 416 Diag(Old->getLocation(), diag::note_template_prev_declaration) 417 << false; 418 } else if (New->getTemplateSpecializationKind() 419 != TSK_ImplicitInstantiation && 420 New->getTemplateSpecializationKind() != TSK_Undeclared) { 421 // C++ [temp.expr.spec]p21: 422 // Default function arguments shall not be specified in a declaration 423 // or a definition for one of the following explicit specializations: 424 // - the explicit specialization of a function template; 425 // - the explicit specialization of a member function template; 426 // - the explicit specialization of a member function of a class 427 // template where the class template specialization to which the 428 // member function specialization belongs is implicitly 429 // instantiated. 430 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 431 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 432 << New->getDeclName() 433 << NewParam->getDefaultArgRange(); 434 } else if (New->getDeclContext()->isDependentContext()) { 435 // C++ [dcl.fct.default]p6 (DR217): 436 // Default arguments for a member function of a class template shall 437 // be specified on the initial declaration of the member function 438 // within the class template. 439 // 440 // Reading the tea leaves a bit in DR217 and its reference to DR205 441 // leads me to the conclusion that one cannot add default function 442 // arguments for an out-of-line definition of a member function of a 443 // dependent type. 444 int WhichKind = 2; 445 if (CXXRecordDecl *Record 446 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 447 if (Record->getDescribedClassTemplate()) 448 WhichKind = 0; 449 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 450 WhichKind = 1; 451 else 452 WhichKind = 2; 453 } 454 455 Diag(NewParam->getLocation(), 456 diag::err_param_default_argument_member_template_redecl) 457 << WhichKind 458 << NewParam->getDefaultArgRange(); 459 } 460 } 461 } 462 463 if (CheckEquivalentExceptionSpec(Old, New)) 464 Invalid = true; 465 466 return Invalid; 467} 468 469/// \brief Merge the exception specifications of two variable declarations. 470/// 471/// This is called when there's a redeclaration of a VarDecl. The function 472/// checks if the redeclaration might have an exception specification and 473/// validates compatibility and merges the specs if necessary. 474void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 475 // Shortcut if exceptions are disabled. 476 if (!getLangOptions().CXXExceptions) 477 return; 478 479 assert(Context.hasSameType(New->getType(), Old->getType()) && 480 "Should only be called if types are otherwise the same."); 481 482 QualType NewType = New->getType(); 483 QualType OldType = Old->getType(); 484 485 // We're only interested in pointers and references to functions, as well 486 // as pointers to member functions. 487 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 488 NewType = R->getPointeeType(); 489 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 490 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 491 NewType = P->getPointeeType(); 492 OldType = OldType->getAs<PointerType>()->getPointeeType(); 493 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 494 NewType = M->getPointeeType(); 495 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 496 } 497 498 if (!NewType->isFunctionProtoType()) 499 return; 500 501 // There's lots of special cases for functions. For function pointers, system 502 // libraries are hopefully not as broken so that we don't need these 503 // workarounds. 504 if (CheckEquivalentExceptionSpec( 505 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 506 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 507 New->setInvalidDecl(); 508 } 509} 510 511/// CheckCXXDefaultArguments - Verify that the default arguments for a 512/// function declaration are well-formed according to C++ 513/// [dcl.fct.default]. 514void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 515 unsigned NumParams = FD->getNumParams(); 516 unsigned p; 517 518 // Find first parameter with a default argument 519 for (p = 0; p < NumParams; ++p) { 520 ParmVarDecl *Param = FD->getParamDecl(p); 521 if (Param->hasDefaultArg()) 522 break; 523 } 524 525 // C++ [dcl.fct.default]p4: 526 // In a given function declaration, all parameters 527 // subsequent to a parameter with a default argument shall 528 // have default arguments supplied in this or previous 529 // declarations. A default argument shall not be redefined 530 // by a later declaration (not even to the same value). 531 unsigned LastMissingDefaultArg = 0; 532 for (; p < NumParams; ++p) { 533 ParmVarDecl *Param = FD->getParamDecl(p); 534 if (!Param->hasDefaultArg()) { 535 if (Param->isInvalidDecl()) 536 /* We already complained about this parameter. */; 537 else if (Param->getIdentifier()) 538 Diag(Param->getLocation(), 539 diag::err_param_default_argument_missing_name) 540 << Param->getIdentifier(); 541 else 542 Diag(Param->getLocation(), 543 diag::err_param_default_argument_missing); 544 545 LastMissingDefaultArg = p; 546 } 547 } 548 549 if (LastMissingDefaultArg > 0) { 550 // Some default arguments were missing. Clear out all of the 551 // default arguments up to (and including) the last missing 552 // default argument, so that we leave the function parameters 553 // in a semantically valid state. 554 for (p = 0; p <= LastMissingDefaultArg; ++p) { 555 ParmVarDecl *Param = FD->getParamDecl(p); 556 if (Param->hasDefaultArg()) { 557 Param->setDefaultArg(0); 558 } 559 } 560 } 561} 562 563/// isCurrentClassName - Determine whether the identifier II is the 564/// name of the class type currently being defined. In the case of 565/// nested classes, this will only return true if II is the name of 566/// the innermost class. 567bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 568 const CXXScopeSpec *SS) { 569 assert(getLangOptions().CPlusPlus && "No class names in C!"); 570 571 CXXRecordDecl *CurDecl; 572 if (SS && SS->isSet() && !SS->isInvalid()) { 573 DeclContext *DC = computeDeclContext(*SS, true); 574 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 575 } else 576 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 577 578 if (CurDecl && CurDecl->getIdentifier()) 579 return &II == CurDecl->getIdentifier(); 580 else 581 return false; 582} 583 584/// \brief Check the validity of a C++ base class specifier. 585/// 586/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 587/// and returns NULL otherwise. 588CXXBaseSpecifier * 589Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 590 SourceRange SpecifierRange, 591 bool Virtual, AccessSpecifier Access, 592 TypeSourceInfo *TInfo, 593 SourceLocation EllipsisLoc) { 594 QualType BaseType = TInfo->getType(); 595 596 // C++ [class.union]p1: 597 // A union shall not have base classes. 598 if (Class->isUnion()) { 599 Diag(Class->getLocation(), diag::err_base_clause_on_union) 600 << SpecifierRange; 601 return 0; 602 } 603 604 if (EllipsisLoc.isValid() && 605 !TInfo->getType()->containsUnexpandedParameterPack()) { 606 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 607 << TInfo->getTypeLoc().getSourceRange(); 608 EllipsisLoc = SourceLocation(); 609 } 610 611 if (BaseType->isDependentType()) 612 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 613 Class->getTagKind() == TTK_Class, 614 Access, TInfo, EllipsisLoc); 615 616 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 617 618 // Base specifiers must be record types. 619 if (!BaseType->isRecordType()) { 620 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 621 return 0; 622 } 623 624 // C++ [class.union]p1: 625 // A union shall not be used as a base class. 626 if (BaseType->isUnionType()) { 627 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 628 return 0; 629 } 630 631 // C++ [class.derived]p2: 632 // The class-name in a base-specifier shall not be an incompletely 633 // defined class. 634 if (RequireCompleteType(BaseLoc, BaseType, 635 PDiag(diag::err_incomplete_base_class) 636 << SpecifierRange)) { 637 Class->setInvalidDecl(); 638 return 0; 639 } 640 641 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 642 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 643 assert(BaseDecl && "Record type has no declaration"); 644 BaseDecl = BaseDecl->getDefinition(); 645 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 646 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 647 assert(CXXBaseDecl && "Base type is not a C++ type"); 648 649 // C++ [class]p3: 650 // If a class is marked final and it appears as a base-type-specifier in 651 // base-clause, the program is ill-formed. 652 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 653 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 654 << CXXBaseDecl->getDeclName(); 655 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 656 << CXXBaseDecl->getDeclName(); 657 return 0; 658 } 659 660 if (BaseDecl->isInvalidDecl()) 661 Class->setInvalidDecl(); 662 663 // Create the base specifier. 664 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 665 Class->getTagKind() == TTK_Class, 666 Access, TInfo, EllipsisLoc); 667} 668 669/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 670/// one entry in the base class list of a class specifier, for 671/// example: 672/// class foo : public bar, virtual private baz { 673/// 'public bar' and 'virtual private baz' are each base-specifiers. 674BaseResult 675Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 676 bool Virtual, AccessSpecifier Access, 677 ParsedType basetype, SourceLocation BaseLoc, 678 SourceLocation EllipsisLoc) { 679 if (!classdecl) 680 return true; 681 682 AdjustDeclIfTemplate(classdecl); 683 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 684 if (!Class) 685 return true; 686 687 TypeSourceInfo *TInfo = 0; 688 GetTypeFromParser(basetype, &TInfo); 689 690 if (EllipsisLoc.isInvalid() && 691 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 692 UPPC_BaseType)) 693 return true; 694 695 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 696 Virtual, Access, TInfo, 697 EllipsisLoc)) 698 return BaseSpec; 699 700 return true; 701} 702 703/// \brief Performs the actual work of attaching the given base class 704/// specifiers to a C++ class. 705bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 706 unsigned NumBases) { 707 if (NumBases == 0) 708 return false; 709 710 // Used to keep track of which base types we have already seen, so 711 // that we can properly diagnose redundant direct base types. Note 712 // that the key is always the unqualified canonical type of the base 713 // class. 714 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 715 716 // Copy non-redundant base specifiers into permanent storage. 717 unsigned NumGoodBases = 0; 718 bool Invalid = false; 719 for (unsigned idx = 0; idx < NumBases; ++idx) { 720 QualType NewBaseType 721 = Context.getCanonicalType(Bases[idx]->getType()); 722 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 723 if (!Class->hasObjectMember()) { 724 if (const RecordType *FDTTy = 725 NewBaseType.getTypePtr()->getAs<RecordType>()) 726 if (FDTTy->getDecl()->hasObjectMember()) 727 Class->setHasObjectMember(true); 728 } 729 730 if (KnownBaseTypes[NewBaseType]) { 731 // C++ [class.mi]p3: 732 // A class shall not be specified as a direct base class of a 733 // derived class more than once. 734 Diag(Bases[idx]->getSourceRange().getBegin(), 735 diag::err_duplicate_base_class) 736 << KnownBaseTypes[NewBaseType]->getType() 737 << Bases[idx]->getSourceRange(); 738 739 // Delete the duplicate base class specifier; we're going to 740 // overwrite its pointer later. 741 Context.Deallocate(Bases[idx]); 742 743 Invalid = true; 744 } else { 745 // Okay, add this new base class. 746 KnownBaseTypes[NewBaseType] = Bases[idx]; 747 Bases[NumGoodBases++] = Bases[idx]; 748 } 749 } 750 751 // Attach the remaining base class specifiers to the derived class. 752 Class->setBases(Bases, NumGoodBases); 753 754 // Delete the remaining (good) base class specifiers, since their 755 // data has been copied into the CXXRecordDecl. 756 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 757 Context.Deallocate(Bases[idx]); 758 759 return Invalid; 760} 761 762/// ActOnBaseSpecifiers - Attach the given base specifiers to the 763/// class, after checking whether there are any duplicate base 764/// classes. 765void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 766 unsigned NumBases) { 767 if (!ClassDecl || !Bases || !NumBases) 768 return; 769 770 AdjustDeclIfTemplate(ClassDecl); 771 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 772 (CXXBaseSpecifier**)(Bases), NumBases); 773} 774 775static CXXRecordDecl *GetClassForType(QualType T) { 776 if (const RecordType *RT = T->getAs<RecordType>()) 777 return cast<CXXRecordDecl>(RT->getDecl()); 778 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 779 return ICT->getDecl(); 780 else 781 return 0; 782} 783 784/// \brief Determine whether the type \p Derived is a C++ class that is 785/// derived from the type \p Base. 786bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 787 if (!getLangOptions().CPlusPlus) 788 return false; 789 790 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 791 if (!DerivedRD) 792 return false; 793 794 CXXRecordDecl *BaseRD = GetClassForType(Base); 795 if (!BaseRD) 796 return false; 797 798 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 799 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 800} 801 802/// \brief Determine whether the type \p Derived is a C++ class that is 803/// derived from the type \p Base. 804bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 805 if (!getLangOptions().CPlusPlus) 806 return false; 807 808 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 809 if (!DerivedRD) 810 return false; 811 812 CXXRecordDecl *BaseRD = GetClassForType(Base); 813 if (!BaseRD) 814 return false; 815 816 return DerivedRD->isDerivedFrom(BaseRD, Paths); 817} 818 819void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 820 CXXCastPath &BasePathArray) { 821 assert(BasePathArray.empty() && "Base path array must be empty!"); 822 assert(Paths.isRecordingPaths() && "Must record paths!"); 823 824 const CXXBasePath &Path = Paths.front(); 825 826 // We first go backward and check if we have a virtual base. 827 // FIXME: It would be better if CXXBasePath had the base specifier for 828 // the nearest virtual base. 829 unsigned Start = 0; 830 for (unsigned I = Path.size(); I != 0; --I) { 831 if (Path[I - 1].Base->isVirtual()) { 832 Start = I - 1; 833 break; 834 } 835 } 836 837 // Now add all bases. 838 for (unsigned I = Start, E = Path.size(); I != E; ++I) 839 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 840} 841 842/// \brief Determine whether the given base path includes a virtual 843/// base class. 844bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 845 for (CXXCastPath::const_iterator B = BasePath.begin(), 846 BEnd = BasePath.end(); 847 B != BEnd; ++B) 848 if ((*B)->isVirtual()) 849 return true; 850 851 return false; 852} 853 854/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 855/// conversion (where Derived and Base are class types) is 856/// well-formed, meaning that the conversion is unambiguous (and 857/// that all of the base classes are accessible). Returns true 858/// and emits a diagnostic if the code is ill-formed, returns false 859/// otherwise. Loc is the location where this routine should point to 860/// if there is an error, and Range is the source range to highlight 861/// if there is an error. 862bool 863Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 864 unsigned InaccessibleBaseID, 865 unsigned AmbigiousBaseConvID, 866 SourceLocation Loc, SourceRange Range, 867 DeclarationName Name, 868 CXXCastPath *BasePath) { 869 // First, determine whether the path from Derived to Base is 870 // ambiguous. This is slightly more expensive than checking whether 871 // the Derived to Base conversion exists, because here we need to 872 // explore multiple paths to determine if there is an ambiguity. 873 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 874 /*DetectVirtual=*/false); 875 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 876 assert(DerivationOkay && 877 "Can only be used with a derived-to-base conversion"); 878 (void)DerivationOkay; 879 880 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 881 if (InaccessibleBaseID) { 882 // Check that the base class can be accessed. 883 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 884 InaccessibleBaseID)) { 885 case AR_inaccessible: 886 return true; 887 case AR_accessible: 888 case AR_dependent: 889 case AR_delayed: 890 break; 891 } 892 } 893 894 // Build a base path if necessary. 895 if (BasePath) 896 BuildBasePathArray(Paths, *BasePath); 897 return false; 898 } 899 900 // We know that the derived-to-base conversion is ambiguous, and 901 // we're going to produce a diagnostic. Perform the derived-to-base 902 // search just one more time to compute all of the possible paths so 903 // that we can print them out. This is more expensive than any of 904 // the previous derived-to-base checks we've done, but at this point 905 // performance isn't as much of an issue. 906 Paths.clear(); 907 Paths.setRecordingPaths(true); 908 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 909 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 910 (void)StillOkay; 911 912 // Build up a textual representation of the ambiguous paths, e.g., 913 // D -> B -> A, that will be used to illustrate the ambiguous 914 // conversions in the diagnostic. We only print one of the paths 915 // to each base class subobject. 916 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 917 918 Diag(Loc, AmbigiousBaseConvID) 919 << Derived << Base << PathDisplayStr << Range << Name; 920 return true; 921} 922 923bool 924Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 925 SourceLocation Loc, SourceRange Range, 926 CXXCastPath *BasePath, 927 bool IgnoreAccess) { 928 return CheckDerivedToBaseConversion(Derived, Base, 929 IgnoreAccess ? 0 930 : diag::err_upcast_to_inaccessible_base, 931 diag::err_ambiguous_derived_to_base_conv, 932 Loc, Range, DeclarationName(), 933 BasePath); 934} 935 936 937/// @brief Builds a string representing ambiguous paths from a 938/// specific derived class to different subobjects of the same base 939/// class. 940/// 941/// This function builds a string that can be used in error messages 942/// to show the different paths that one can take through the 943/// inheritance hierarchy to go from the derived class to different 944/// subobjects of a base class. The result looks something like this: 945/// @code 946/// struct D -> struct B -> struct A 947/// struct D -> struct C -> struct A 948/// @endcode 949std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 950 std::string PathDisplayStr; 951 std::set<unsigned> DisplayedPaths; 952 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 953 Path != Paths.end(); ++Path) { 954 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 955 // We haven't displayed a path to this particular base 956 // class subobject yet. 957 PathDisplayStr += "\n "; 958 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 959 for (CXXBasePath::const_iterator Element = Path->begin(); 960 Element != Path->end(); ++Element) 961 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 962 } 963 } 964 965 return PathDisplayStr; 966} 967 968//===----------------------------------------------------------------------===// 969// C++ class member Handling 970//===----------------------------------------------------------------------===// 971 972/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 973Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 974 SourceLocation ASLoc, 975 SourceLocation ColonLoc) { 976 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 977 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 978 ASLoc, ColonLoc); 979 CurContext->addHiddenDecl(ASDecl); 980 return ASDecl; 981} 982 983/// CheckOverrideControl - Check C++0x override control semantics. 984void Sema::CheckOverrideControl(const Decl *D) { 985 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 986 if (!MD || !MD->isVirtual()) 987 return; 988 989 if (MD->isDependentContext()) 990 return; 991 992 // C++0x [class.virtual]p3: 993 // If a virtual function is marked with the virt-specifier override and does 994 // not override a member function of a base class, 995 // the program is ill-formed. 996 bool HasOverriddenMethods = 997 MD->begin_overridden_methods() != MD->end_overridden_methods(); 998 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 999 Diag(MD->getLocation(), 1000 diag::err_function_marked_override_not_overriding) 1001 << MD->getDeclName(); 1002 return; 1003 } 1004} 1005 1006/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1007/// function overrides a virtual member function marked 'final', according to 1008/// C++0x [class.virtual]p3. 1009bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1010 const CXXMethodDecl *Old) { 1011 if (!Old->hasAttr<FinalAttr>()) 1012 return false; 1013 1014 Diag(New->getLocation(), diag::err_final_function_overridden) 1015 << New->getDeclName(); 1016 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1017 return true; 1018} 1019 1020/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1021/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1022/// bitfield width if there is one and 'InitExpr' specifies the initializer if 1023/// any. 1024Decl * 1025Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1026 MultiTemplateParamsArg TemplateParameterLists, 1027 ExprTy *BW, const VirtSpecifiers &VS, 1028 ExprTy *InitExpr, bool IsDefinition, 1029 bool Deleted, SourceLocation DefaultLoc) { 1030 const DeclSpec &DS = D.getDeclSpec(); 1031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1032 DeclarationName Name = NameInfo.getName(); 1033 SourceLocation Loc = NameInfo.getLoc(); 1034 1035 // For anonymous bitfields, the location should point to the type. 1036 if (Loc.isInvalid()) 1037 Loc = D.getSourceRange().getBegin(); 1038 1039 Expr *BitWidth = static_cast<Expr*>(BW); 1040 Expr *Init = static_cast<Expr*>(InitExpr); 1041 1042 assert(isa<CXXRecordDecl>(CurContext)); 1043 assert(!DS.isFriendSpecified()); 1044 1045 bool isFunc = false; 1046 if (D.isFunctionDeclarator()) 1047 isFunc = true; 1048 else if (D.getNumTypeObjects() == 0 && 1049 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1050 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1051 isFunc = TDType->isFunctionType(); 1052 } 1053 1054 // C++ 9.2p6: A member shall not be declared to have automatic storage 1055 // duration (auto, register) or with the extern storage-class-specifier. 1056 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1057 // data members and cannot be applied to names declared const or static, 1058 // and cannot be applied to reference members. 1059 switch (DS.getStorageClassSpec()) { 1060 case DeclSpec::SCS_unspecified: 1061 case DeclSpec::SCS_typedef: 1062 case DeclSpec::SCS_static: 1063 // FALL THROUGH. 1064 break; 1065 case DeclSpec::SCS_mutable: 1066 if (isFunc) { 1067 if (DS.getStorageClassSpecLoc().isValid()) 1068 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1069 else 1070 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1071 1072 // FIXME: It would be nicer if the keyword was ignored only for this 1073 // declarator. Otherwise we could get follow-up errors. 1074 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1075 } 1076 break; 1077 default: 1078 if (DS.getStorageClassSpecLoc().isValid()) 1079 Diag(DS.getStorageClassSpecLoc(), 1080 diag::err_storageclass_invalid_for_member); 1081 else 1082 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1083 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1084 } 1085 1086 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1087 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1088 !isFunc); 1089 1090 Decl *Member; 1091 if (isInstField) { 1092 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1093 1094 if (DefaultLoc.isValid()) 1095 Diag(DefaultLoc, diag::err_default_special_members); 1096 1097 if (SS.isSet() && !SS.isInvalid()) { 1098 // The user provided a superfluous scope specifier inside a class 1099 // definition: 1100 // 1101 // class X { 1102 // int X::member; 1103 // }; 1104 DeclContext *DC = 0; 1105 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1106 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1107 << Name << FixItHint::CreateRemoval(SS.getRange()); 1108 else 1109 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1110 << Name << SS.getRange(); 1111 1112 SS.clear(); 1113 } 1114 1115 // FIXME: Check for template parameters! 1116 // FIXME: Check that the name is an identifier! 1117 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1118 AS); 1119 assert(Member && "HandleField never returns null"); 1120 } else { 1121 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition, 1122 DefaultLoc); 1123 if (!Member) { 1124 return 0; 1125 } 1126 1127 // Non-instance-fields can't have a bitfield. 1128 if (BitWidth) { 1129 if (Member->isInvalidDecl()) { 1130 // don't emit another diagnostic. 1131 } else if (isa<VarDecl>(Member)) { 1132 // C++ 9.6p3: A bit-field shall not be a static member. 1133 // "static member 'A' cannot be a bit-field" 1134 Diag(Loc, diag::err_static_not_bitfield) 1135 << Name << BitWidth->getSourceRange(); 1136 } else if (isa<TypedefDecl>(Member)) { 1137 // "typedef member 'x' cannot be a bit-field" 1138 Diag(Loc, diag::err_typedef_not_bitfield) 1139 << Name << BitWidth->getSourceRange(); 1140 } else { 1141 // A function typedef ("typedef int f(); f a;"). 1142 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1143 Diag(Loc, diag::err_not_integral_type_bitfield) 1144 << Name << cast<ValueDecl>(Member)->getType() 1145 << BitWidth->getSourceRange(); 1146 } 1147 1148 BitWidth = 0; 1149 Member->setInvalidDecl(); 1150 } 1151 1152 Member->setAccess(AS); 1153 1154 // If we have declared a member function template, set the access of the 1155 // templated declaration as well. 1156 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1157 FunTmpl->getTemplatedDecl()->setAccess(AS); 1158 } 1159 1160 if (VS.isOverrideSpecified()) { 1161 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1162 if (!MD || !MD->isVirtual()) { 1163 Diag(Member->getLocStart(), 1164 diag::override_keyword_only_allowed_on_virtual_member_functions) 1165 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1166 } else 1167 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1168 } 1169 if (VS.isFinalSpecified()) { 1170 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1171 if (!MD || !MD->isVirtual()) { 1172 Diag(Member->getLocStart(), 1173 diag::override_keyword_only_allowed_on_virtual_member_functions) 1174 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1175 } else 1176 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1177 } 1178 1179 if (VS.getLastLocation().isValid()) { 1180 // Update the end location of a method that has a virt-specifiers. 1181 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1182 MD->setRangeEnd(VS.getLastLocation()); 1183 } 1184 1185 CheckOverrideControl(Member); 1186 1187 assert((Name || isInstField) && "No identifier for non-field ?"); 1188 1189 if (Init) 1190 AddInitializerToDecl(Member, Init, false, 1191 DS.getTypeSpecType() == DeclSpec::TST_auto); 1192 if (Deleted) // FIXME: Source location is not very good. 1193 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1194 1195 FinalizeDeclaration(Member); 1196 1197 if (isInstField) 1198 FieldCollector->Add(cast<FieldDecl>(Member)); 1199 return Member; 1200} 1201 1202/// \brief Find the direct and/or virtual base specifiers that 1203/// correspond to the given base type, for use in base initialization 1204/// within a constructor. 1205static bool FindBaseInitializer(Sema &SemaRef, 1206 CXXRecordDecl *ClassDecl, 1207 QualType BaseType, 1208 const CXXBaseSpecifier *&DirectBaseSpec, 1209 const CXXBaseSpecifier *&VirtualBaseSpec) { 1210 // First, check for a direct base class. 1211 DirectBaseSpec = 0; 1212 for (CXXRecordDecl::base_class_const_iterator Base 1213 = ClassDecl->bases_begin(); 1214 Base != ClassDecl->bases_end(); ++Base) { 1215 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1216 // We found a direct base of this type. That's what we're 1217 // initializing. 1218 DirectBaseSpec = &*Base; 1219 break; 1220 } 1221 } 1222 1223 // Check for a virtual base class. 1224 // FIXME: We might be able to short-circuit this if we know in advance that 1225 // there are no virtual bases. 1226 VirtualBaseSpec = 0; 1227 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1228 // We haven't found a base yet; search the class hierarchy for a 1229 // virtual base class. 1230 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1231 /*DetectVirtual=*/false); 1232 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1233 BaseType, Paths)) { 1234 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1235 Path != Paths.end(); ++Path) { 1236 if (Path->back().Base->isVirtual()) { 1237 VirtualBaseSpec = Path->back().Base; 1238 break; 1239 } 1240 } 1241 } 1242 } 1243 1244 return DirectBaseSpec || VirtualBaseSpec; 1245} 1246 1247/// ActOnMemInitializer - Handle a C++ member initializer. 1248MemInitResult 1249Sema::ActOnMemInitializer(Decl *ConstructorD, 1250 Scope *S, 1251 CXXScopeSpec &SS, 1252 IdentifierInfo *MemberOrBase, 1253 ParsedType TemplateTypeTy, 1254 SourceLocation IdLoc, 1255 SourceLocation LParenLoc, 1256 ExprTy **Args, unsigned NumArgs, 1257 SourceLocation RParenLoc, 1258 SourceLocation EllipsisLoc) { 1259 if (!ConstructorD) 1260 return true; 1261 1262 AdjustDeclIfTemplate(ConstructorD); 1263 1264 CXXConstructorDecl *Constructor 1265 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1266 if (!Constructor) { 1267 // The user wrote a constructor initializer on a function that is 1268 // not a C++ constructor. Ignore the error for now, because we may 1269 // have more member initializers coming; we'll diagnose it just 1270 // once in ActOnMemInitializers. 1271 return true; 1272 } 1273 1274 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1275 1276 // C++ [class.base.init]p2: 1277 // Names in a mem-initializer-id are looked up in the scope of the 1278 // constructor's class and, if not found in that scope, are looked 1279 // up in the scope containing the constructor's definition. 1280 // [Note: if the constructor's class contains a member with the 1281 // same name as a direct or virtual base class of the class, a 1282 // mem-initializer-id naming the member or base class and composed 1283 // of a single identifier refers to the class member. A 1284 // mem-initializer-id for the hidden base class may be specified 1285 // using a qualified name. ] 1286 if (!SS.getScopeRep() && !TemplateTypeTy) { 1287 // Look for a member, first. 1288 FieldDecl *Member = 0; 1289 DeclContext::lookup_result Result 1290 = ClassDecl->lookup(MemberOrBase); 1291 if (Result.first != Result.second) { 1292 Member = dyn_cast<FieldDecl>(*Result.first); 1293 1294 if (Member) { 1295 if (EllipsisLoc.isValid()) 1296 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1297 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1298 1299 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1300 LParenLoc, RParenLoc); 1301 } 1302 1303 // Handle anonymous union case. 1304 if (IndirectFieldDecl* IndirectField 1305 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1306 if (EllipsisLoc.isValid()) 1307 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1308 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1309 1310 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1311 NumArgs, IdLoc, 1312 LParenLoc, RParenLoc); 1313 } 1314 } 1315 } 1316 // It didn't name a member, so see if it names a class. 1317 QualType BaseType; 1318 TypeSourceInfo *TInfo = 0; 1319 1320 if (TemplateTypeTy) { 1321 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1322 } else { 1323 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1324 LookupParsedName(R, S, &SS); 1325 1326 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1327 if (!TyD) { 1328 if (R.isAmbiguous()) return true; 1329 1330 // We don't want access-control diagnostics here. 1331 R.suppressDiagnostics(); 1332 1333 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1334 bool NotUnknownSpecialization = false; 1335 DeclContext *DC = computeDeclContext(SS, false); 1336 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1337 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1338 1339 if (!NotUnknownSpecialization) { 1340 // When the scope specifier can refer to a member of an unknown 1341 // specialization, we take it as a type name. 1342 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1343 SS.getWithLocInContext(Context), 1344 *MemberOrBase, IdLoc); 1345 if (BaseType.isNull()) 1346 return true; 1347 1348 R.clear(); 1349 R.setLookupName(MemberOrBase); 1350 } 1351 } 1352 1353 // If no results were found, try to correct typos. 1354 if (R.empty() && BaseType.isNull() && 1355 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1356 R.isSingleResult()) { 1357 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1358 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1359 // We have found a non-static data member with a similar 1360 // name to what was typed; complain and initialize that 1361 // member. 1362 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1363 << MemberOrBase << true << R.getLookupName() 1364 << FixItHint::CreateReplacement(R.getNameLoc(), 1365 R.getLookupName().getAsString()); 1366 Diag(Member->getLocation(), diag::note_previous_decl) 1367 << Member->getDeclName(); 1368 1369 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1370 LParenLoc, RParenLoc); 1371 } 1372 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1373 const CXXBaseSpecifier *DirectBaseSpec; 1374 const CXXBaseSpecifier *VirtualBaseSpec; 1375 if (FindBaseInitializer(*this, ClassDecl, 1376 Context.getTypeDeclType(Type), 1377 DirectBaseSpec, VirtualBaseSpec)) { 1378 // We have found a direct or virtual base class with a 1379 // similar name to what was typed; complain and initialize 1380 // that base class. 1381 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1382 << MemberOrBase << false << R.getLookupName() 1383 << FixItHint::CreateReplacement(R.getNameLoc(), 1384 R.getLookupName().getAsString()); 1385 1386 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1387 : VirtualBaseSpec; 1388 Diag(BaseSpec->getSourceRange().getBegin(), 1389 diag::note_base_class_specified_here) 1390 << BaseSpec->getType() 1391 << BaseSpec->getSourceRange(); 1392 1393 TyD = Type; 1394 } 1395 } 1396 } 1397 1398 if (!TyD && BaseType.isNull()) { 1399 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1400 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1401 return true; 1402 } 1403 } 1404 1405 if (BaseType.isNull()) { 1406 BaseType = Context.getTypeDeclType(TyD); 1407 if (SS.isSet()) { 1408 NestedNameSpecifier *Qualifier = 1409 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1410 1411 // FIXME: preserve source range information 1412 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1413 } 1414 } 1415 } 1416 1417 if (!TInfo) 1418 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1419 1420 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1421 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1422} 1423 1424/// Checks an initializer expression for use of uninitialized fields, such as 1425/// containing the field that is being initialized. Returns true if there is an 1426/// uninitialized field was used an updates the SourceLocation parameter; false 1427/// otherwise. 1428static bool InitExprContainsUninitializedFields(const Stmt *S, 1429 const ValueDecl *LhsField, 1430 SourceLocation *L) { 1431 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1432 1433 if (isa<CallExpr>(S)) { 1434 // Do not descend into function calls or constructors, as the use 1435 // of an uninitialized field may be valid. One would have to inspect 1436 // the contents of the function/ctor to determine if it is safe or not. 1437 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1438 // may be safe, depending on what the function/ctor does. 1439 return false; 1440 } 1441 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1442 const NamedDecl *RhsField = ME->getMemberDecl(); 1443 1444 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1445 // The member expression points to a static data member. 1446 assert(VD->isStaticDataMember() && 1447 "Member points to non-static data member!"); 1448 (void)VD; 1449 return false; 1450 } 1451 1452 if (isa<EnumConstantDecl>(RhsField)) { 1453 // The member expression points to an enum. 1454 return false; 1455 } 1456 1457 if (RhsField == LhsField) { 1458 // Initializing a field with itself. Throw a warning. 1459 // But wait; there are exceptions! 1460 // Exception #1: The field may not belong to this record. 1461 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1462 const Expr *base = ME->getBase(); 1463 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1464 // Even though the field matches, it does not belong to this record. 1465 return false; 1466 } 1467 // None of the exceptions triggered; return true to indicate an 1468 // uninitialized field was used. 1469 *L = ME->getMemberLoc(); 1470 return true; 1471 } 1472 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1473 // sizeof/alignof doesn't reference contents, do not warn. 1474 return false; 1475 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1476 // address-of doesn't reference contents (the pointer may be dereferenced 1477 // in the same expression but it would be rare; and weird). 1478 if (UOE->getOpcode() == UO_AddrOf) 1479 return false; 1480 } 1481 for (Stmt::const_child_range it = S->children(); it; ++it) { 1482 if (!*it) { 1483 // An expression such as 'member(arg ?: "")' may trigger this. 1484 continue; 1485 } 1486 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1487 return true; 1488 } 1489 return false; 1490} 1491 1492MemInitResult 1493Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1494 unsigned NumArgs, SourceLocation IdLoc, 1495 SourceLocation LParenLoc, 1496 SourceLocation RParenLoc) { 1497 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1498 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1499 assert((DirectMember || IndirectMember) && 1500 "Member must be a FieldDecl or IndirectFieldDecl"); 1501 1502 if (Member->isInvalidDecl()) 1503 return true; 1504 1505 // Diagnose value-uses of fields to initialize themselves, e.g. 1506 // foo(foo) 1507 // where foo is not also a parameter to the constructor. 1508 // TODO: implement -Wuninitialized and fold this into that framework. 1509 for (unsigned i = 0; i < NumArgs; ++i) { 1510 SourceLocation L; 1511 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1512 // FIXME: Return true in the case when other fields are used before being 1513 // uninitialized. For example, let this field be the i'th field. When 1514 // initializing the i'th field, throw a warning if any of the >= i'th 1515 // fields are used, as they are not yet initialized. 1516 // Right now we are only handling the case where the i'th field uses 1517 // itself in its initializer. 1518 Diag(L, diag::warn_field_is_uninit); 1519 } 1520 } 1521 1522 bool HasDependentArg = false; 1523 for (unsigned i = 0; i < NumArgs; i++) 1524 HasDependentArg |= Args[i]->isTypeDependent(); 1525 1526 Expr *Init; 1527 if (Member->getType()->isDependentType() || HasDependentArg) { 1528 // Can't check initialization for a member of dependent type or when 1529 // any of the arguments are type-dependent expressions. 1530 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1531 RParenLoc); 1532 1533 // Erase any temporaries within this evaluation context; we're not 1534 // going to track them in the AST, since we'll be rebuilding the 1535 // ASTs during template instantiation. 1536 ExprTemporaries.erase( 1537 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1538 ExprTemporaries.end()); 1539 } else { 1540 // Initialize the member. 1541 InitializedEntity MemberEntity = 1542 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1543 : InitializedEntity::InitializeMember(IndirectMember, 0); 1544 InitializationKind Kind = 1545 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1546 1547 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1548 1549 ExprResult MemberInit = 1550 InitSeq.Perform(*this, MemberEntity, Kind, 1551 MultiExprArg(*this, Args, NumArgs), 0); 1552 if (MemberInit.isInvalid()) 1553 return true; 1554 1555 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1556 1557 // C++0x [class.base.init]p7: 1558 // The initialization of each base and member constitutes a 1559 // full-expression. 1560 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1561 if (MemberInit.isInvalid()) 1562 return true; 1563 1564 // If we are in a dependent context, template instantiation will 1565 // perform this type-checking again. Just save the arguments that we 1566 // received in a ParenListExpr. 1567 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1568 // of the information that we have about the member 1569 // initializer. However, deconstructing the ASTs is a dicey process, 1570 // and this approach is far more likely to get the corner cases right. 1571 if (CurContext->isDependentContext()) 1572 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1573 RParenLoc); 1574 else 1575 Init = MemberInit.get(); 1576 } 1577 1578 if (DirectMember) { 1579 return new (Context) CXXCtorInitializer(Context, DirectMember, 1580 IdLoc, LParenLoc, Init, 1581 RParenLoc); 1582 } else { 1583 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1584 IdLoc, LParenLoc, Init, 1585 RParenLoc); 1586 } 1587} 1588 1589MemInitResult 1590Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1591 Expr **Args, unsigned NumArgs, 1592 SourceLocation NameLoc, 1593 SourceLocation LParenLoc, 1594 SourceLocation RParenLoc, 1595 CXXRecordDecl *ClassDecl) { 1596 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1597 if (!LangOpts.CPlusPlus0x) 1598 return Diag(Loc, diag::err_delegation_0x_only) 1599 << TInfo->getTypeLoc().getLocalSourceRange(); 1600 1601 // Initialize the object. 1602 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1603 QualType(ClassDecl->getTypeForDecl(), 0)); 1604 InitializationKind Kind = 1605 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1606 1607 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1608 1609 ExprResult DelegationInit = 1610 InitSeq.Perform(*this, DelegationEntity, Kind, 1611 MultiExprArg(*this, Args, NumArgs), 0); 1612 if (DelegationInit.isInvalid()) 1613 return true; 1614 1615 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1616 CXXConstructorDecl *Constructor 1617 = ConExpr->getConstructor(); 1618 assert(Constructor && "Delegating constructor with no target?"); 1619 1620 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1621 1622 // C++0x [class.base.init]p7: 1623 // The initialization of each base and member constitutes a 1624 // full-expression. 1625 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1626 if (DelegationInit.isInvalid()) 1627 return true; 1628 1629 // If we are in a dependent context, template instantiation will 1630 // perform this type-checking again. Just save the arguments that we 1631 // received in a ParenListExpr. 1632 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1633 // of the information that we have about the base 1634 // initializer. However, deconstructing the ASTs is a dicey process, 1635 // and this approach is far more likely to get the corner cases right. 1636 if (CurContext->isDependentContext()) { 1637 ExprResult Init 1638 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, 1639 NumArgs, RParenLoc)); 1640 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, 1641 Constructor, Init.takeAs<Expr>(), 1642 RParenLoc); 1643 } 1644 1645 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1646 DelegationInit.takeAs<Expr>(), 1647 RParenLoc); 1648} 1649 1650MemInitResult 1651Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1652 Expr **Args, unsigned NumArgs, 1653 SourceLocation LParenLoc, SourceLocation RParenLoc, 1654 CXXRecordDecl *ClassDecl, 1655 SourceLocation EllipsisLoc) { 1656 bool HasDependentArg = false; 1657 for (unsigned i = 0; i < NumArgs; i++) 1658 HasDependentArg |= Args[i]->isTypeDependent(); 1659 1660 SourceLocation BaseLoc 1661 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1662 1663 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1664 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1665 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1666 1667 // C++ [class.base.init]p2: 1668 // [...] Unless the mem-initializer-id names a nonstatic data 1669 // member of the constructor's class or a direct or virtual base 1670 // of that class, the mem-initializer is ill-formed. A 1671 // mem-initializer-list can initialize a base class using any 1672 // name that denotes that base class type. 1673 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1674 1675 if (EllipsisLoc.isValid()) { 1676 // This is a pack expansion. 1677 if (!BaseType->containsUnexpandedParameterPack()) { 1678 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1679 << SourceRange(BaseLoc, RParenLoc); 1680 1681 EllipsisLoc = SourceLocation(); 1682 } 1683 } else { 1684 // Check for any unexpanded parameter packs. 1685 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1686 return true; 1687 1688 for (unsigned I = 0; I != NumArgs; ++I) 1689 if (DiagnoseUnexpandedParameterPack(Args[I])) 1690 return true; 1691 } 1692 1693 // Check for direct and virtual base classes. 1694 const CXXBaseSpecifier *DirectBaseSpec = 0; 1695 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1696 if (!Dependent) { 1697 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1698 BaseType)) 1699 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1700 LParenLoc, RParenLoc, ClassDecl); 1701 1702 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1703 VirtualBaseSpec); 1704 1705 // C++ [base.class.init]p2: 1706 // Unless the mem-initializer-id names a nonstatic data member of the 1707 // constructor's class or a direct or virtual base of that class, the 1708 // mem-initializer is ill-formed. 1709 if (!DirectBaseSpec && !VirtualBaseSpec) { 1710 // If the class has any dependent bases, then it's possible that 1711 // one of those types will resolve to the same type as 1712 // BaseType. Therefore, just treat this as a dependent base 1713 // class initialization. FIXME: Should we try to check the 1714 // initialization anyway? It seems odd. 1715 if (ClassDecl->hasAnyDependentBases()) 1716 Dependent = true; 1717 else 1718 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1719 << BaseType << Context.getTypeDeclType(ClassDecl) 1720 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1721 } 1722 } 1723 1724 if (Dependent) { 1725 // Can't check initialization for a base of dependent type or when 1726 // any of the arguments are type-dependent expressions. 1727 ExprResult BaseInit 1728 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1729 RParenLoc)); 1730 1731 // Erase any temporaries within this evaluation context; we're not 1732 // going to track them in the AST, since we'll be rebuilding the 1733 // ASTs during template instantiation. 1734 ExprTemporaries.erase( 1735 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1736 ExprTemporaries.end()); 1737 1738 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1739 /*IsVirtual=*/false, 1740 LParenLoc, 1741 BaseInit.takeAs<Expr>(), 1742 RParenLoc, 1743 EllipsisLoc); 1744 } 1745 1746 // C++ [base.class.init]p2: 1747 // If a mem-initializer-id is ambiguous because it designates both 1748 // a direct non-virtual base class and an inherited virtual base 1749 // class, the mem-initializer is ill-formed. 1750 if (DirectBaseSpec && VirtualBaseSpec) 1751 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1752 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1753 1754 CXXBaseSpecifier *BaseSpec 1755 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1756 if (!BaseSpec) 1757 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1758 1759 // Initialize the base. 1760 InitializedEntity BaseEntity = 1761 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1762 InitializationKind Kind = 1763 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1764 1765 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1766 1767 ExprResult BaseInit = 1768 InitSeq.Perform(*this, BaseEntity, Kind, 1769 MultiExprArg(*this, Args, NumArgs), 0); 1770 if (BaseInit.isInvalid()) 1771 return true; 1772 1773 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1774 1775 // C++0x [class.base.init]p7: 1776 // The initialization of each base and member constitutes a 1777 // full-expression. 1778 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1779 if (BaseInit.isInvalid()) 1780 return true; 1781 1782 // If we are in a dependent context, template instantiation will 1783 // perform this type-checking again. Just save the arguments that we 1784 // received in a ParenListExpr. 1785 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1786 // of the information that we have about the base 1787 // initializer. However, deconstructing the ASTs is a dicey process, 1788 // and this approach is far more likely to get the corner cases right. 1789 if (CurContext->isDependentContext()) { 1790 ExprResult Init 1791 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1792 RParenLoc)); 1793 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1794 BaseSpec->isVirtual(), 1795 LParenLoc, 1796 Init.takeAs<Expr>(), 1797 RParenLoc, 1798 EllipsisLoc); 1799 } 1800 1801 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1802 BaseSpec->isVirtual(), 1803 LParenLoc, 1804 BaseInit.takeAs<Expr>(), 1805 RParenLoc, 1806 EllipsisLoc); 1807} 1808 1809/// ImplicitInitializerKind - How an implicit base or member initializer should 1810/// initialize its base or member. 1811enum ImplicitInitializerKind { 1812 IIK_Default, 1813 IIK_Copy, 1814 IIK_Move 1815}; 1816 1817static bool 1818BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1819 ImplicitInitializerKind ImplicitInitKind, 1820 CXXBaseSpecifier *BaseSpec, 1821 bool IsInheritedVirtualBase, 1822 CXXCtorInitializer *&CXXBaseInit) { 1823 InitializedEntity InitEntity 1824 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1825 IsInheritedVirtualBase); 1826 1827 ExprResult BaseInit; 1828 1829 switch (ImplicitInitKind) { 1830 case IIK_Default: { 1831 InitializationKind InitKind 1832 = InitializationKind::CreateDefault(Constructor->getLocation()); 1833 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1834 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1835 MultiExprArg(SemaRef, 0, 0)); 1836 break; 1837 } 1838 1839 case IIK_Copy: { 1840 ParmVarDecl *Param = Constructor->getParamDecl(0); 1841 QualType ParamType = Param->getType().getNonReferenceType(); 1842 1843 Expr *CopyCtorArg = 1844 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1845 Constructor->getLocation(), ParamType, 1846 VK_LValue, 0); 1847 1848 // Cast to the base class to avoid ambiguities. 1849 QualType ArgTy = 1850 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1851 ParamType.getQualifiers()); 1852 1853 CXXCastPath BasePath; 1854 BasePath.push_back(BaseSpec); 1855 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1856 CK_UncheckedDerivedToBase, 1857 VK_LValue, &BasePath).take(); 1858 1859 InitializationKind InitKind 1860 = InitializationKind::CreateDirect(Constructor->getLocation(), 1861 SourceLocation(), SourceLocation()); 1862 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1863 &CopyCtorArg, 1); 1864 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1865 MultiExprArg(&CopyCtorArg, 1)); 1866 break; 1867 } 1868 1869 case IIK_Move: 1870 assert(false && "Unhandled initializer kind!"); 1871 } 1872 1873 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1874 if (BaseInit.isInvalid()) 1875 return true; 1876 1877 CXXBaseInit = 1878 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1879 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1880 SourceLocation()), 1881 BaseSpec->isVirtual(), 1882 SourceLocation(), 1883 BaseInit.takeAs<Expr>(), 1884 SourceLocation(), 1885 SourceLocation()); 1886 1887 return false; 1888} 1889 1890static bool 1891BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1892 ImplicitInitializerKind ImplicitInitKind, 1893 FieldDecl *Field, 1894 CXXCtorInitializer *&CXXMemberInit) { 1895 if (Field->isInvalidDecl()) 1896 return true; 1897 1898 SourceLocation Loc = Constructor->getLocation(); 1899 1900 if (ImplicitInitKind == IIK_Copy) { 1901 ParmVarDecl *Param = Constructor->getParamDecl(0); 1902 QualType ParamType = Param->getType().getNonReferenceType(); 1903 1904 Expr *MemberExprBase = 1905 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1906 Loc, ParamType, VK_LValue, 0); 1907 1908 // Build a reference to this field within the parameter. 1909 CXXScopeSpec SS; 1910 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1911 Sema::LookupMemberName); 1912 MemberLookup.addDecl(Field, AS_public); 1913 MemberLookup.resolveKind(); 1914 ExprResult CopyCtorArg 1915 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1916 ParamType, Loc, 1917 /*IsArrow=*/false, 1918 SS, 1919 /*FirstQualifierInScope=*/0, 1920 MemberLookup, 1921 /*TemplateArgs=*/0); 1922 if (CopyCtorArg.isInvalid()) 1923 return true; 1924 1925 // When the field we are copying is an array, create index variables for 1926 // each dimension of the array. We use these index variables to subscript 1927 // the source array, and other clients (e.g., CodeGen) will perform the 1928 // necessary iteration with these index variables. 1929 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1930 QualType BaseType = Field->getType(); 1931 QualType SizeType = SemaRef.Context.getSizeType(); 1932 while (const ConstantArrayType *Array 1933 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1934 // Create the iteration variable for this array index. 1935 IdentifierInfo *IterationVarName = 0; 1936 { 1937 llvm::SmallString<8> Str; 1938 llvm::raw_svector_ostream OS(Str); 1939 OS << "__i" << IndexVariables.size(); 1940 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1941 } 1942 VarDecl *IterationVar 1943 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 1944 IterationVarName, SizeType, 1945 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1946 SC_None, SC_None); 1947 IndexVariables.push_back(IterationVar); 1948 1949 // Create a reference to the iteration variable. 1950 ExprResult IterationVarRef 1951 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 1952 assert(!IterationVarRef.isInvalid() && 1953 "Reference to invented variable cannot fail!"); 1954 1955 // Subscript the array with this iteration variable. 1956 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1957 Loc, 1958 IterationVarRef.take(), 1959 Loc); 1960 if (CopyCtorArg.isInvalid()) 1961 return true; 1962 1963 BaseType = Array->getElementType(); 1964 } 1965 1966 // Construct the entity that we will be initializing. For an array, this 1967 // will be first element in the array, which may require several levels 1968 // of array-subscript entities. 1969 llvm::SmallVector<InitializedEntity, 4> Entities; 1970 Entities.reserve(1 + IndexVariables.size()); 1971 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1972 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1973 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1974 0, 1975 Entities.back())); 1976 1977 // Direct-initialize to use the copy constructor. 1978 InitializationKind InitKind = 1979 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1980 1981 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1982 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1983 &CopyCtorArgE, 1); 1984 1985 ExprResult MemberInit 1986 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1987 MultiExprArg(&CopyCtorArgE, 1)); 1988 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 1989 if (MemberInit.isInvalid()) 1990 return true; 1991 1992 CXXMemberInit 1993 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1994 MemberInit.takeAs<Expr>(), Loc, 1995 IndexVariables.data(), 1996 IndexVariables.size()); 1997 return false; 1998 } 1999 2000 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2001 2002 QualType FieldBaseElementType = 2003 SemaRef.Context.getBaseElementType(Field->getType()); 2004 2005 if (FieldBaseElementType->isRecordType()) { 2006 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2007 InitializationKind InitKind = 2008 InitializationKind::CreateDefault(Loc); 2009 2010 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2011 ExprResult MemberInit = 2012 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2013 2014 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2015 if (MemberInit.isInvalid()) 2016 return true; 2017 2018 CXXMemberInit = 2019 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2020 Field, Loc, Loc, 2021 MemberInit.get(), 2022 Loc); 2023 return false; 2024 } 2025 2026 if (FieldBaseElementType->isReferenceType()) { 2027 SemaRef.Diag(Constructor->getLocation(), 2028 diag::err_uninitialized_member_in_ctor) 2029 << (int)Constructor->isImplicit() 2030 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2031 << 0 << Field->getDeclName(); 2032 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2033 return true; 2034 } 2035 2036 if (FieldBaseElementType.isConstQualified()) { 2037 SemaRef.Diag(Constructor->getLocation(), 2038 diag::err_uninitialized_member_in_ctor) 2039 << (int)Constructor->isImplicit() 2040 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2041 << 1 << Field->getDeclName(); 2042 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2043 return true; 2044 } 2045 2046 // Nothing to initialize. 2047 CXXMemberInit = 0; 2048 return false; 2049} 2050 2051namespace { 2052struct BaseAndFieldInfo { 2053 Sema &S; 2054 CXXConstructorDecl *Ctor; 2055 bool AnyErrorsInInits; 2056 ImplicitInitializerKind IIK; 2057 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2058 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2059 2060 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2061 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2062 // FIXME: Handle implicit move constructors. 2063 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2064 IIK = IIK_Copy; 2065 else 2066 IIK = IIK_Default; 2067 } 2068}; 2069} 2070 2071static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 2072 FieldDecl *Top, FieldDecl *Field) { 2073 2074 // Overwhelmingly common case: we have a direct initializer for this field. 2075 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2076 Info.AllToInit.push_back(Init); 2077 return false; 2078 } 2079 2080 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2081 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2082 assert(FieldClassType && "anonymous struct/union without record type"); 2083 CXXRecordDecl *FieldClassDecl 2084 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2085 2086 // Even though union members never have non-trivial default 2087 // constructions in C++03, we still build member initializers for aggregate 2088 // record types which can be union members, and C++0x allows non-trivial 2089 // default constructors for union members, so we ensure that only one 2090 // member is initialized for these. 2091 if (FieldClassDecl->isUnion()) { 2092 // First check for an explicit initializer for one field. 2093 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2094 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2095 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2096 Info.AllToInit.push_back(Init); 2097 2098 // Once we've initialized a field of an anonymous union, the union 2099 // field in the class is also initialized, so exit immediately. 2100 return false; 2101 } else if ((*FA)->isAnonymousStructOrUnion()) { 2102 if (CollectFieldInitializer(Info, Top, *FA)) 2103 return true; 2104 } 2105 } 2106 2107 // Fallthrough and construct a default initializer for the union as 2108 // a whole, which can call its default constructor if such a thing exists 2109 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2110 // behavior going forward with C++0x, when anonymous unions there are 2111 // finalized, we should revisit this. 2112 } else { 2113 // For structs, we simply descend through to initialize all members where 2114 // necessary. 2115 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2116 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2117 if (CollectFieldInitializer(Info, Top, *FA)) 2118 return true; 2119 } 2120 } 2121 } 2122 2123 // Don't try to build an implicit initializer if there were semantic 2124 // errors in any of the initializers (and therefore we might be 2125 // missing some that the user actually wrote). 2126 if (Info.AnyErrorsInInits) 2127 return false; 2128 2129 CXXCtorInitializer *Init = 0; 2130 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2131 return true; 2132 2133 if (Init) 2134 Info.AllToInit.push_back(Init); 2135 2136 return false; 2137} 2138 2139bool 2140Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2141 CXXCtorInitializer *Initializer) { 2142 assert(Initializer->isDelegatingInitializer()); 2143 Constructor->setNumCtorInitializers(1); 2144 CXXCtorInitializer **initializer = 2145 new (Context) CXXCtorInitializer*[1]; 2146 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2147 Constructor->setCtorInitializers(initializer); 2148 2149 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2150 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2151 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2152 } 2153 2154 DelegatingCtorDecls.push_back(Constructor); 2155 2156 return false; 2157} 2158 2159bool 2160Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2161 CXXCtorInitializer **Initializers, 2162 unsigned NumInitializers, 2163 bool AnyErrors) { 2164 if (Constructor->getDeclContext()->isDependentContext()) { 2165 // Just store the initializers as written, they will be checked during 2166 // instantiation. 2167 if (NumInitializers > 0) { 2168 Constructor->setNumCtorInitializers(NumInitializers); 2169 CXXCtorInitializer **baseOrMemberInitializers = 2170 new (Context) CXXCtorInitializer*[NumInitializers]; 2171 memcpy(baseOrMemberInitializers, Initializers, 2172 NumInitializers * sizeof(CXXCtorInitializer*)); 2173 Constructor->setCtorInitializers(baseOrMemberInitializers); 2174 } 2175 2176 return false; 2177 } 2178 2179 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2180 2181 // We need to build the initializer AST according to order of construction 2182 // and not what user specified in the Initializers list. 2183 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2184 if (!ClassDecl) 2185 return true; 2186 2187 bool HadError = false; 2188 2189 for (unsigned i = 0; i < NumInitializers; i++) { 2190 CXXCtorInitializer *Member = Initializers[i]; 2191 2192 if (Member->isBaseInitializer()) 2193 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2194 else 2195 Info.AllBaseFields[Member->getAnyMember()] = Member; 2196 } 2197 2198 // Keep track of the direct virtual bases. 2199 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2200 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2201 E = ClassDecl->bases_end(); I != E; ++I) { 2202 if (I->isVirtual()) 2203 DirectVBases.insert(I); 2204 } 2205 2206 // Push virtual bases before others. 2207 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2208 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2209 2210 if (CXXCtorInitializer *Value 2211 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2212 Info.AllToInit.push_back(Value); 2213 } else if (!AnyErrors) { 2214 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2215 CXXCtorInitializer *CXXBaseInit; 2216 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2217 VBase, IsInheritedVirtualBase, 2218 CXXBaseInit)) { 2219 HadError = true; 2220 continue; 2221 } 2222 2223 Info.AllToInit.push_back(CXXBaseInit); 2224 } 2225 } 2226 2227 // Non-virtual bases. 2228 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2229 E = ClassDecl->bases_end(); Base != E; ++Base) { 2230 // Virtuals are in the virtual base list and already constructed. 2231 if (Base->isVirtual()) 2232 continue; 2233 2234 if (CXXCtorInitializer *Value 2235 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2236 Info.AllToInit.push_back(Value); 2237 } else if (!AnyErrors) { 2238 CXXCtorInitializer *CXXBaseInit; 2239 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2240 Base, /*IsInheritedVirtualBase=*/false, 2241 CXXBaseInit)) { 2242 HadError = true; 2243 continue; 2244 } 2245 2246 Info.AllToInit.push_back(CXXBaseInit); 2247 } 2248 } 2249 2250 // Fields. 2251 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2252 E = ClassDecl->field_end(); Field != E; ++Field) { 2253 if ((*Field)->getType()->isIncompleteArrayType()) { 2254 assert(ClassDecl->hasFlexibleArrayMember() && 2255 "Incomplete array type is not valid"); 2256 continue; 2257 } 2258 if (CollectFieldInitializer(Info, *Field, *Field)) 2259 HadError = true; 2260 } 2261 2262 NumInitializers = Info.AllToInit.size(); 2263 if (NumInitializers > 0) { 2264 Constructor->setNumCtorInitializers(NumInitializers); 2265 CXXCtorInitializer **baseOrMemberInitializers = 2266 new (Context) CXXCtorInitializer*[NumInitializers]; 2267 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2268 NumInitializers * sizeof(CXXCtorInitializer*)); 2269 Constructor->setCtorInitializers(baseOrMemberInitializers); 2270 2271 // Constructors implicitly reference the base and member 2272 // destructors. 2273 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2274 Constructor->getParent()); 2275 } 2276 2277 return HadError; 2278} 2279 2280static void *GetKeyForTopLevelField(FieldDecl *Field) { 2281 // For anonymous unions, use the class declaration as the key. 2282 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2283 if (RT->getDecl()->isAnonymousStructOrUnion()) 2284 return static_cast<void *>(RT->getDecl()); 2285 } 2286 return static_cast<void *>(Field); 2287} 2288 2289static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2290 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2291} 2292 2293static void *GetKeyForMember(ASTContext &Context, 2294 CXXCtorInitializer *Member) { 2295 if (!Member->isAnyMemberInitializer()) 2296 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2297 2298 // For fields injected into the class via declaration of an anonymous union, 2299 // use its anonymous union class declaration as the unique key. 2300 FieldDecl *Field = Member->getAnyMember(); 2301 2302 // If the field is a member of an anonymous struct or union, our key 2303 // is the anonymous record decl that's a direct child of the class. 2304 RecordDecl *RD = Field->getParent(); 2305 if (RD->isAnonymousStructOrUnion()) { 2306 while (true) { 2307 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2308 if (Parent->isAnonymousStructOrUnion()) 2309 RD = Parent; 2310 else 2311 break; 2312 } 2313 2314 return static_cast<void *>(RD); 2315 } 2316 2317 return static_cast<void *>(Field); 2318} 2319 2320static void 2321DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2322 const CXXConstructorDecl *Constructor, 2323 CXXCtorInitializer **Inits, 2324 unsigned NumInits) { 2325 if (Constructor->getDeclContext()->isDependentContext()) 2326 return; 2327 2328 // Don't check initializers order unless the warning is enabled at the 2329 // location of at least one initializer. 2330 bool ShouldCheckOrder = false; 2331 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2332 CXXCtorInitializer *Init = Inits[InitIndex]; 2333 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2334 Init->getSourceLocation()) 2335 != Diagnostic::Ignored) { 2336 ShouldCheckOrder = true; 2337 break; 2338 } 2339 } 2340 if (!ShouldCheckOrder) 2341 return; 2342 2343 // Build the list of bases and members in the order that they'll 2344 // actually be initialized. The explicit initializers should be in 2345 // this same order but may be missing things. 2346 llvm::SmallVector<const void*, 32> IdealInitKeys; 2347 2348 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2349 2350 // 1. Virtual bases. 2351 for (CXXRecordDecl::base_class_const_iterator VBase = 2352 ClassDecl->vbases_begin(), 2353 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2354 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2355 2356 // 2. Non-virtual bases. 2357 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2358 E = ClassDecl->bases_end(); Base != E; ++Base) { 2359 if (Base->isVirtual()) 2360 continue; 2361 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2362 } 2363 2364 // 3. Direct fields. 2365 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2366 E = ClassDecl->field_end(); Field != E; ++Field) 2367 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2368 2369 unsigned NumIdealInits = IdealInitKeys.size(); 2370 unsigned IdealIndex = 0; 2371 2372 CXXCtorInitializer *PrevInit = 0; 2373 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2374 CXXCtorInitializer *Init = Inits[InitIndex]; 2375 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2376 2377 // Scan forward to try to find this initializer in the idealized 2378 // initializers list. 2379 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2380 if (InitKey == IdealInitKeys[IdealIndex]) 2381 break; 2382 2383 // If we didn't find this initializer, it must be because we 2384 // scanned past it on a previous iteration. That can only 2385 // happen if we're out of order; emit a warning. 2386 if (IdealIndex == NumIdealInits && PrevInit) { 2387 Sema::SemaDiagnosticBuilder D = 2388 SemaRef.Diag(PrevInit->getSourceLocation(), 2389 diag::warn_initializer_out_of_order); 2390 2391 if (PrevInit->isAnyMemberInitializer()) 2392 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2393 else 2394 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2395 2396 if (Init->isAnyMemberInitializer()) 2397 D << 0 << Init->getAnyMember()->getDeclName(); 2398 else 2399 D << 1 << Init->getBaseClassInfo()->getType(); 2400 2401 // Move back to the initializer's location in the ideal list. 2402 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2403 if (InitKey == IdealInitKeys[IdealIndex]) 2404 break; 2405 2406 assert(IdealIndex != NumIdealInits && 2407 "initializer not found in initializer list"); 2408 } 2409 2410 PrevInit = Init; 2411 } 2412} 2413 2414namespace { 2415bool CheckRedundantInit(Sema &S, 2416 CXXCtorInitializer *Init, 2417 CXXCtorInitializer *&PrevInit) { 2418 if (!PrevInit) { 2419 PrevInit = Init; 2420 return false; 2421 } 2422 2423 if (FieldDecl *Field = Init->getMember()) 2424 S.Diag(Init->getSourceLocation(), 2425 diag::err_multiple_mem_initialization) 2426 << Field->getDeclName() 2427 << Init->getSourceRange(); 2428 else { 2429 const Type *BaseClass = Init->getBaseClass(); 2430 assert(BaseClass && "neither field nor base"); 2431 S.Diag(Init->getSourceLocation(), 2432 diag::err_multiple_base_initialization) 2433 << QualType(BaseClass, 0) 2434 << Init->getSourceRange(); 2435 } 2436 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2437 << 0 << PrevInit->getSourceRange(); 2438 2439 return true; 2440} 2441 2442typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2443typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2444 2445bool CheckRedundantUnionInit(Sema &S, 2446 CXXCtorInitializer *Init, 2447 RedundantUnionMap &Unions) { 2448 FieldDecl *Field = Init->getAnyMember(); 2449 RecordDecl *Parent = Field->getParent(); 2450 if (!Parent->isAnonymousStructOrUnion()) 2451 return false; 2452 2453 NamedDecl *Child = Field; 2454 do { 2455 if (Parent->isUnion()) { 2456 UnionEntry &En = Unions[Parent]; 2457 if (En.first && En.first != Child) { 2458 S.Diag(Init->getSourceLocation(), 2459 diag::err_multiple_mem_union_initialization) 2460 << Field->getDeclName() 2461 << Init->getSourceRange(); 2462 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2463 << 0 << En.second->getSourceRange(); 2464 return true; 2465 } else if (!En.first) { 2466 En.first = Child; 2467 En.second = Init; 2468 } 2469 } 2470 2471 Child = Parent; 2472 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2473 } while (Parent->isAnonymousStructOrUnion()); 2474 2475 return false; 2476} 2477} 2478 2479/// ActOnMemInitializers - Handle the member initializers for a constructor. 2480void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2481 SourceLocation ColonLoc, 2482 MemInitTy **meminits, unsigned NumMemInits, 2483 bool AnyErrors) { 2484 if (!ConstructorDecl) 2485 return; 2486 2487 AdjustDeclIfTemplate(ConstructorDecl); 2488 2489 CXXConstructorDecl *Constructor 2490 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2491 2492 if (!Constructor) { 2493 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2494 return; 2495 } 2496 2497 CXXCtorInitializer **MemInits = 2498 reinterpret_cast<CXXCtorInitializer **>(meminits); 2499 2500 // Mapping for the duplicate initializers check. 2501 // For member initializers, this is keyed with a FieldDecl*. 2502 // For base initializers, this is keyed with a Type*. 2503 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2504 2505 // Mapping for the inconsistent anonymous-union initializers check. 2506 RedundantUnionMap MemberUnions; 2507 2508 bool HadError = false; 2509 for (unsigned i = 0; i < NumMemInits; i++) { 2510 CXXCtorInitializer *Init = MemInits[i]; 2511 2512 // Set the source order index. 2513 Init->setSourceOrder(i); 2514 2515 if (Init->isAnyMemberInitializer()) { 2516 FieldDecl *Field = Init->getAnyMember(); 2517 if (CheckRedundantInit(*this, Init, Members[Field]) || 2518 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2519 HadError = true; 2520 } else if (Init->isBaseInitializer()) { 2521 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2522 if (CheckRedundantInit(*this, Init, Members[Key])) 2523 HadError = true; 2524 } else { 2525 assert(Init->isDelegatingInitializer()); 2526 // This must be the only initializer 2527 if (i != 0 || NumMemInits > 1) { 2528 Diag(MemInits[0]->getSourceLocation(), 2529 diag::err_delegating_initializer_alone) 2530 << MemInits[0]->getSourceRange(); 2531 HadError = true; 2532 // We will treat this as being the only initializer. 2533 } 2534 SetDelegatingInitializer(Constructor, MemInits[i]); 2535 // Return immediately as the initializer is set. 2536 return; 2537 } 2538 } 2539 2540 if (HadError) 2541 return; 2542 2543 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2544 2545 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2546} 2547 2548void 2549Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2550 CXXRecordDecl *ClassDecl) { 2551 // Ignore dependent contexts. 2552 if (ClassDecl->isDependentContext()) 2553 return; 2554 2555 // FIXME: all the access-control diagnostics are positioned on the 2556 // field/base declaration. That's probably good; that said, the 2557 // user might reasonably want to know why the destructor is being 2558 // emitted, and we currently don't say. 2559 2560 // Non-static data members. 2561 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2562 E = ClassDecl->field_end(); I != E; ++I) { 2563 FieldDecl *Field = *I; 2564 if (Field->isInvalidDecl()) 2565 continue; 2566 QualType FieldType = Context.getBaseElementType(Field->getType()); 2567 2568 const RecordType* RT = FieldType->getAs<RecordType>(); 2569 if (!RT) 2570 continue; 2571 2572 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2573 if (FieldClassDecl->isInvalidDecl()) 2574 continue; 2575 if (FieldClassDecl->hasTrivialDestructor()) 2576 continue; 2577 2578 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2579 assert(Dtor && "No dtor found for FieldClassDecl!"); 2580 CheckDestructorAccess(Field->getLocation(), Dtor, 2581 PDiag(diag::err_access_dtor_field) 2582 << Field->getDeclName() 2583 << FieldType); 2584 2585 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2586 } 2587 2588 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2589 2590 // Bases. 2591 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2592 E = ClassDecl->bases_end(); Base != E; ++Base) { 2593 // Bases are always records in a well-formed non-dependent class. 2594 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2595 2596 // Remember direct virtual bases. 2597 if (Base->isVirtual()) 2598 DirectVirtualBases.insert(RT); 2599 2600 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2601 // If our base class is invalid, we probably can't get its dtor anyway. 2602 if (BaseClassDecl->isInvalidDecl()) 2603 continue; 2604 // Ignore trivial destructors. 2605 if (BaseClassDecl->hasTrivialDestructor()) 2606 continue; 2607 2608 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2609 assert(Dtor && "No dtor found for BaseClassDecl!"); 2610 2611 // FIXME: caret should be on the start of the class name 2612 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2613 PDiag(diag::err_access_dtor_base) 2614 << Base->getType() 2615 << Base->getSourceRange()); 2616 2617 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2618 } 2619 2620 // Virtual bases. 2621 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2622 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2623 2624 // Bases are always records in a well-formed non-dependent class. 2625 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2626 2627 // Ignore direct virtual bases. 2628 if (DirectVirtualBases.count(RT)) 2629 continue; 2630 2631 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2632 // If our base class is invalid, we probably can't get its dtor anyway. 2633 if (BaseClassDecl->isInvalidDecl()) 2634 continue; 2635 // Ignore trivial destructors. 2636 if (BaseClassDecl->hasTrivialDestructor()) 2637 continue; 2638 2639 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2640 assert(Dtor && "No dtor found for BaseClassDecl!"); 2641 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2642 PDiag(diag::err_access_dtor_vbase) 2643 << VBase->getType()); 2644 2645 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2646 } 2647} 2648 2649void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2650 if (!CDtorDecl) 2651 return; 2652 2653 if (CXXConstructorDecl *Constructor 2654 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2655 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2656} 2657 2658bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2659 unsigned DiagID, AbstractDiagSelID SelID) { 2660 if (SelID == -1) 2661 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2662 else 2663 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2664} 2665 2666bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2667 const PartialDiagnostic &PD) { 2668 if (!getLangOptions().CPlusPlus) 2669 return false; 2670 2671 if (const ArrayType *AT = Context.getAsArrayType(T)) 2672 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2673 2674 if (const PointerType *PT = T->getAs<PointerType>()) { 2675 // Find the innermost pointer type. 2676 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2677 PT = T; 2678 2679 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2680 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2681 } 2682 2683 const RecordType *RT = T->getAs<RecordType>(); 2684 if (!RT) 2685 return false; 2686 2687 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2688 2689 // We can't answer whether something is abstract until it has a 2690 // definition. If it's currently being defined, we'll walk back 2691 // over all the declarations when we have a full definition. 2692 const CXXRecordDecl *Def = RD->getDefinition(); 2693 if (!Def || Def->isBeingDefined()) 2694 return false; 2695 2696 if (!RD->isAbstract()) 2697 return false; 2698 2699 Diag(Loc, PD) << RD->getDeclName(); 2700 DiagnoseAbstractType(RD); 2701 2702 return true; 2703} 2704 2705void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2706 // Check if we've already emitted the list of pure virtual functions 2707 // for this class. 2708 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2709 return; 2710 2711 CXXFinalOverriderMap FinalOverriders; 2712 RD->getFinalOverriders(FinalOverriders); 2713 2714 // Keep a set of seen pure methods so we won't diagnose the same method 2715 // more than once. 2716 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2717 2718 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2719 MEnd = FinalOverriders.end(); 2720 M != MEnd; 2721 ++M) { 2722 for (OverridingMethods::iterator SO = M->second.begin(), 2723 SOEnd = M->second.end(); 2724 SO != SOEnd; ++SO) { 2725 // C++ [class.abstract]p4: 2726 // A class is abstract if it contains or inherits at least one 2727 // pure virtual function for which the final overrider is pure 2728 // virtual. 2729 2730 // 2731 if (SO->second.size() != 1) 2732 continue; 2733 2734 if (!SO->second.front().Method->isPure()) 2735 continue; 2736 2737 if (!SeenPureMethods.insert(SO->second.front().Method)) 2738 continue; 2739 2740 Diag(SO->second.front().Method->getLocation(), 2741 diag::note_pure_virtual_function) 2742 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2743 } 2744 } 2745 2746 if (!PureVirtualClassDiagSet) 2747 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2748 PureVirtualClassDiagSet->insert(RD); 2749} 2750 2751namespace { 2752struct AbstractUsageInfo { 2753 Sema &S; 2754 CXXRecordDecl *Record; 2755 CanQualType AbstractType; 2756 bool Invalid; 2757 2758 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2759 : S(S), Record(Record), 2760 AbstractType(S.Context.getCanonicalType( 2761 S.Context.getTypeDeclType(Record))), 2762 Invalid(false) {} 2763 2764 void DiagnoseAbstractType() { 2765 if (Invalid) return; 2766 S.DiagnoseAbstractType(Record); 2767 Invalid = true; 2768 } 2769 2770 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2771}; 2772 2773struct CheckAbstractUsage { 2774 AbstractUsageInfo &Info; 2775 const NamedDecl *Ctx; 2776 2777 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2778 : Info(Info), Ctx(Ctx) {} 2779 2780 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2781 switch (TL.getTypeLocClass()) { 2782#define ABSTRACT_TYPELOC(CLASS, PARENT) 2783#define TYPELOC(CLASS, PARENT) \ 2784 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2785#include "clang/AST/TypeLocNodes.def" 2786 } 2787 } 2788 2789 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2790 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2791 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2792 if (!TL.getArg(I)) 2793 continue; 2794 2795 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2796 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2797 } 2798 } 2799 2800 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2801 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2802 } 2803 2804 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2805 // Visit the type parameters from a permissive context. 2806 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2807 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2808 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2809 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2810 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2811 // TODO: other template argument types? 2812 } 2813 } 2814 2815 // Visit pointee types from a permissive context. 2816#define CheckPolymorphic(Type) \ 2817 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2818 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2819 } 2820 CheckPolymorphic(PointerTypeLoc) 2821 CheckPolymorphic(ReferenceTypeLoc) 2822 CheckPolymorphic(MemberPointerTypeLoc) 2823 CheckPolymorphic(BlockPointerTypeLoc) 2824 2825 /// Handle all the types we haven't given a more specific 2826 /// implementation for above. 2827 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2828 // Every other kind of type that we haven't called out already 2829 // that has an inner type is either (1) sugar or (2) contains that 2830 // inner type in some way as a subobject. 2831 if (TypeLoc Next = TL.getNextTypeLoc()) 2832 return Visit(Next, Sel); 2833 2834 // If there's no inner type and we're in a permissive context, 2835 // don't diagnose. 2836 if (Sel == Sema::AbstractNone) return; 2837 2838 // Check whether the type matches the abstract type. 2839 QualType T = TL.getType(); 2840 if (T->isArrayType()) { 2841 Sel = Sema::AbstractArrayType; 2842 T = Info.S.Context.getBaseElementType(T); 2843 } 2844 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2845 if (CT != Info.AbstractType) return; 2846 2847 // It matched; do some magic. 2848 if (Sel == Sema::AbstractArrayType) { 2849 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2850 << T << TL.getSourceRange(); 2851 } else { 2852 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2853 << Sel << T << TL.getSourceRange(); 2854 } 2855 Info.DiagnoseAbstractType(); 2856 } 2857}; 2858 2859void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2860 Sema::AbstractDiagSelID Sel) { 2861 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2862} 2863 2864} 2865 2866/// Check for invalid uses of an abstract type in a method declaration. 2867static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2868 CXXMethodDecl *MD) { 2869 // No need to do the check on definitions, which require that 2870 // the return/param types be complete. 2871 if (MD->doesThisDeclarationHaveABody()) 2872 return; 2873 2874 // For safety's sake, just ignore it if we don't have type source 2875 // information. This should never happen for non-implicit methods, 2876 // but... 2877 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2878 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2879} 2880 2881/// Check for invalid uses of an abstract type within a class definition. 2882static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2883 CXXRecordDecl *RD) { 2884 for (CXXRecordDecl::decl_iterator 2885 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2886 Decl *D = *I; 2887 if (D->isImplicit()) continue; 2888 2889 // Methods and method templates. 2890 if (isa<CXXMethodDecl>(D)) { 2891 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2892 } else if (isa<FunctionTemplateDecl>(D)) { 2893 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2894 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2895 2896 // Fields and static variables. 2897 } else if (isa<FieldDecl>(D)) { 2898 FieldDecl *FD = cast<FieldDecl>(D); 2899 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2900 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2901 } else if (isa<VarDecl>(D)) { 2902 VarDecl *VD = cast<VarDecl>(D); 2903 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2904 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2905 2906 // Nested classes and class templates. 2907 } else if (isa<CXXRecordDecl>(D)) { 2908 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2909 } else if (isa<ClassTemplateDecl>(D)) { 2910 CheckAbstractClassUsage(Info, 2911 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2912 } 2913 } 2914} 2915 2916/// \brief Perform semantic checks on a class definition that has been 2917/// completing, introducing implicitly-declared members, checking for 2918/// abstract types, etc. 2919void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2920 if (!Record) 2921 return; 2922 2923 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2924 AbstractUsageInfo Info(*this, Record); 2925 CheckAbstractClassUsage(Info, Record); 2926 } 2927 2928 // If this is not an aggregate type and has no user-declared constructor, 2929 // complain about any non-static data members of reference or const scalar 2930 // type, since they will never get initializers. 2931 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2932 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2933 bool Complained = false; 2934 for (RecordDecl::field_iterator F = Record->field_begin(), 2935 FEnd = Record->field_end(); 2936 F != FEnd; ++F) { 2937 if (F->getType()->isReferenceType() || 2938 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2939 if (!Complained) { 2940 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2941 << Record->getTagKind() << Record; 2942 Complained = true; 2943 } 2944 2945 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2946 << F->getType()->isReferenceType() 2947 << F->getDeclName(); 2948 } 2949 } 2950 } 2951 2952 if (Record->isDynamicClass() && !Record->isDependentType()) 2953 DynamicClasses.push_back(Record); 2954 2955 if (Record->getIdentifier()) { 2956 // C++ [class.mem]p13: 2957 // If T is the name of a class, then each of the following shall have a 2958 // name different from T: 2959 // - every member of every anonymous union that is a member of class T. 2960 // 2961 // C++ [class.mem]p14: 2962 // In addition, if class T has a user-declared constructor (12.1), every 2963 // non-static data member of class T shall have a name different from T. 2964 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 2965 R.first != R.second; ++R.first) { 2966 NamedDecl *D = *R.first; 2967 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 2968 isa<IndirectFieldDecl>(D)) { 2969 Diag(D->getLocation(), diag::err_member_name_of_class) 2970 << D->getDeclName(); 2971 break; 2972 } 2973 } 2974 } 2975 2976 // Warn if the class has virtual methods but non-virtual public destructor. 2977 if (Record->isPolymorphic() && !Record->isDependentType()) { 2978 CXXDestructorDecl *dtor = Record->getDestructor(); 2979 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 2980 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 2981 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 2982 } 2983 2984 // See if a method overloads virtual methods in a base 2985 /// class without overriding any. 2986 if (!Record->isDependentType()) { 2987 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 2988 MEnd = Record->method_end(); 2989 M != MEnd; ++M) { 2990 if (!(*M)->isStatic()) 2991 DiagnoseHiddenVirtualMethods(Record, *M); 2992 } 2993 } 2994 2995 // Declare inherited constructors. We do this eagerly here because: 2996 // - The standard requires an eager diagnostic for conflicting inherited 2997 // constructors from different classes. 2998 // - The lazy declaration of the other implicit constructors is so as to not 2999 // waste space and performance on classes that are not meant to be 3000 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3001 // have inherited constructors. 3002 DeclareInheritedConstructors(Record); 3003 3004 CheckExplicitlyDefaultedMethods(Record); 3005} 3006 3007void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3008 for (CXXRecordDecl::ctor_iterator CI = Record->ctor_begin(), 3009 CE = Record->ctor_end(); 3010 CI != CE; ++CI) { 3011 if (!CI->isInvalidDecl() && CI->isExplicitlyDefaulted()) { 3012 if (CI->isDefaultConstructor()) { 3013 CheckExplicitlyDefaultedDefaultConstructor(*CI); 3014 } 3015 3016 // FIXME: Do copy and move constructors 3017 } 3018 } 3019 3020 // FIXME: Do copy and move assignment and destructors 3021} 3022 3023void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3024 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3025 3026 // Whether this was the first-declared instance of the constructor. 3027 // This affects whether we implicitly add an exception spec (and, eventually, 3028 // constexpr). It is also ill-formed to explicitly default a constructor such 3029 // that it would be deleted. (C++0x [decl.fct.def.default]) 3030 bool First = CD == CD->getCanonicalDecl(); 3031 3032 if (CD->getNumParams() != 0) { 3033 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3034 << CD->getSourceRange(); 3035 CD->setInvalidDecl(); 3036 return; 3037 } 3038 3039 ImplicitExceptionSpecification Spec 3040 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3041 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3042 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3043 *ExceptionType = Context.getFunctionType( 3044 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3045 3046 if (CtorType->hasExceptionSpec()) { 3047 if (CheckEquivalentExceptionSpec( 3048 PDiag(diag::err_incorrect_defaulted_exception_spec), 3049 PDiag(), 3050 ExceptionType, SourceLocation(), 3051 CtorType, CD->getLocation())) { 3052 CD->setInvalidDecl(); 3053 return; 3054 } 3055 } else if (First) { 3056 // We set the declaration to have the computed exception spec here. 3057 // We know there are no parameters. 3058 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3059 } 3060 3061} 3062 3063/// \brief Data used with FindHiddenVirtualMethod 3064namespace { 3065 struct FindHiddenVirtualMethodData { 3066 Sema *S; 3067 CXXMethodDecl *Method; 3068 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3069 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3070 }; 3071} 3072 3073/// \brief Member lookup function that determines whether a given C++ 3074/// method overloads virtual methods in a base class without overriding any, 3075/// to be used with CXXRecordDecl::lookupInBases(). 3076static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3077 CXXBasePath &Path, 3078 void *UserData) { 3079 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3080 3081 FindHiddenVirtualMethodData &Data 3082 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3083 3084 DeclarationName Name = Data.Method->getDeclName(); 3085 assert(Name.getNameKind() == DeclarationName::Identifier); 3086 3087 bool foundSameNameMethod = false; 3088 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3089 for (Path.Decls = BaseRecord->lookup(Name); 3090 Path.Decls.first != Path.Decls.second; 3091 ++Path.Decls.first) { 3092 NamedDecl *D = *Path.Decls.first; 3093 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3094 MD = MD->getCanonicalDecl(); 3095 foundSameNameMethod = true; 3096 // Interested only in hidden virtual methods. 3097 if (!MD->isVirtual()) 3098 continue; 3099 // If the method we are checking overrides a method from its base 3100 // don't warn about the other overloaded methods. 3101 if (!Data.S->IsOverload(Data.Method, MD, false)) 3102 return true; 3103 // Collect the overload only if its hidden. 3104 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 3105 overloadedMethods.push_back(MD); 3106 } 3107 } 3108 3109 if (foundSameNameMethod) 3110 Data.OverloadedMethods.append(overloadedMethods.begin(), 3111 overloadedMethods.end()); 3112 return foundSameNameMethod; 3113} 3114 3115/// \brief See if a method overloads virtual methods in a base class without 3116/// overriding any. 3117void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3118 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 3119 MD->getLocation()) == Diagnostic::Ignored) 3120 return; 3121 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 3122 return; 3123 3124 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 3125 /*bool RecordPaths=*/false, 3126 /*bool DetectVirtual=*/false); 3127 FindHiddenVirtualMethodData Data; 3128 Data.Method = MD; 3129 Data.S = this; 3130 3131 // Keep the base methods that were overriden or introduced in the subclass 3132 // by 'using' in a set. A base method not in this set is hidden. 3133 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 3134 res.first != res.second; ++res.first) { 3135 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 3136 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 3137 E = MD->end_overridden_methods(); 3138 I != E; ++I) 3139 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 3140 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 3141 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 3142 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 3143 } 3144 3145 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 3146 !Data.OverloadedMethods.empty()) { 3147 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 3148 << MD << (Data.OverloadedMethods.size() > 1); 3149 3150 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 3151 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 3152 Diag(overloadedMD->getLocation(), 3153 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 3154 } 3155 } 3156} 3157 3158void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 3159 Decl *TagDecl, 3160 SourceLocation LBrac, 3161 SourceLocation RBrac, 3162 AttributeList *AttrList) { 3163 if (!TagDecl) 3164 return; 3165 3166 AdjustDeclIfTemplate(TagDecl); 3167 3168 ActOnFields(S, RLoc, TagDecl, 3169 // strict aliasing violation! 3170 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 3171 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 3172 3173 CheckCompletedCXXClass( 3174 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 3175} 3176 3177/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 3178/// special functions, such as the default constructor, copy 3179/// constructor, or destructor, to the given C++ class (C++ 3180/// [special]p1). This routine can only be executed just before the 3181/// definition of the class is complete. 3182void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 3183 if (!ClassDecl->hasUserDeclaredConstructor()) 3184 ++ASTContext::NumImplicitDefaultConstructors; 3185 3186 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 3187 ++ASTContext::NumImplicitCopyConstructors; 3188 3189 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 3190 ++ASTContext::NumImplicitCopyAssignmentOperators; 3191 3192 // If we have a dynamic class, then the copy assignment operator may be 3193 // virtual, so we have to declare it immediately. This ensures that, e.g., 3194 // it shows up in the right place in the vtable and that we diagnose 3195 // problems with the implicit exception specification. 3196 if (ClassDecl->isDynamicClass()) 3197 DeclareImplicitCopyAssignment(ClassDecl); 3198 } 3199 3200 if (!ClassDecl->hasUserDeclaredDestructor()) { 3201 ++ASTContext::NumImplicitDestructors; 3202 3203 // If we have a dynamic class, then the destructor may be virtual, so we 3204 // have to declare the destructor immediately. This ensures that, e.g., it 3205 // shows up in the right place in the vtable and that we diagnose problems 3206 // with the implicit exception specification. 3207 if (ClassDecl->isDynamicClass()) 3208 DeclareImplicitDestructor(ClassDecl); 3209 } 3210} 3211 3212void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 3213 if (!D) 3214 return; 3215 3216 int NumParamList = D->getNumTemplateParameterLists(); 3217 for (int i = 0; i < NumParamList; i++) { 3218 TemplateParameterList* Params = D->getTemplateParameterList(i); 3219 for (TemplateParameterList::iterator Param = Params->begin(), 3220 ParamEnd = Params->end(); 3221 Param != ParamEnd; ++Param) { 3222 NamedDecl *Named = cast<NamedDecl>(*Param); 3223 if (Named->getDeclName()) { 3224 S->AddDecl(Named); 3225 IdResolver.AddDecl(Named); 3226 } 3227 } 3228 } 3229} 3230 3231void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 3232 if (!D) 3233 return; 3234 3235 TemplateParameterList *Params = 0; 3236 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 3237 Params = Template->getTemplateParameters(); 3238 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3239 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 3240 Params = PartialSpec->getTemplateParameters(); 3241 else 3242 return; 3243 3244 for (TemplateParameterList::iterator Param = Params->begin(), 3245 ParamEnd = Params->end(); 3246 Param != ParamEnd; ++Param) { 3247 NamedDecl *Named = cast<NamedDecl>(*Param); 3248 if (Named->getDeclName()) { 3249 S->AddDecl(Named); 3250 IdResolver.AddDecl(Named); 3251 } 3252 } 3253} 3254 3255void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3256 if (!RecordD) return; 3257 AdjustDeclIfTemplate(RecordD); 3258 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 3259 PushDeclContext(S, Record); 3260} 3261 3262void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 3263 if (!RecordD) return; 3264 PopDeclContext(); 3265} 3266 3267/// ActOnStartDelayedCXXMethodDeclaration - We have completed 3268/// parsing a top-level (non-nested) C++ class, and we are now 3269/// parsing those parts of the given Method declaration that could 3270/// not be parsed earlier (C++ [class.mem]p2), such as default 3271/// arguments. This action should enter the scope of the given 3272/// Method declaration as if we had just parsed the qualified method 3273/// name. However, it should not bring the parameters into scope; 3274/// that will be performed by ActOnDelayedCXXMethodParameter. 3275void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3276} 3277 3278/// ActOnDelayedCXXMethodParameter - We've already started a delayed 3279/// C++ method declaration. We're (re-)introducing the given 3280/// function parameter into scope for use in parsing later parts of 3281/// the method declaration. For example, we could see an 3282/// ActOnParamDefaultArgument event for this parameter. 3283void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 3284 if (!ParamD) 3285 return; 3286 3287 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 3288 3289 // If this parameter has an unparsed default argument, clear it out 3290 // to make way for the parsed default argument. 3291 if (Param->hasUnparsedDefaultArg()) 3292 Param->setDefaultArg(0); 3293 3294 S->AddDecl(Param); 3295 if (Param->getDeclName()) 3296 IdResolver.AddDecl(Param); 3297} 3298 3299/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 3300/// processing the delayed method declaration for Method. The method 3301/// declaration is now considered finished. There may be a separate 3302/// ActOnStartOfFunctionDef action later (not necessarily 3303/// immediately!) for this method, if it was also defined inside the 3304/// class body. 3305void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 3306 if (!MethodD) 3307 return; 3308 3309 AdjustDeclIfTemplate(MethodD); 3310 3311 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 3312 3313 // Now that we have our default arguments, check the constructor 3314 // again. It could produce additional diagnostics or affect whether 3315 // the class has implicitly-declared destructors, among other 3316 // things. 3317 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 3318 CheckConstructor(Constructor); 3319 3320 // Check the default arguments, which we may have added. 3321 if (!Method->isInvalidDecl()) 3322 CheckCXXDefaultArguments(Method); 3323} 3324 3325/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 3326/// the well-formedness of the constructor declarator @p D with type @p 3327/// R. If there are any errors in the declarator, this routine will 3328/// emit diagnostics and set the invalid bit to true. In any case, the type 3329/// will be updated to reflect a well-formed type for the constructor and 3330/// returned. 3331QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 3332 StorageClass &SC) { 3333 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3334 3335 // C++ [class.ctor]p3: 3336 // A constructor shall not be virtual (10.3) or static (9.4). A 3337 // constructor can be invoked for a const, volatile or const 3338 // volatile object. A constructor shall not be declared const, 3339 // volatile, or const volatile (9.3.2). 3340 if (isVirtual) { 3341 if (!D.isInvalidType()) 3342 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3343 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 3344 << SourceRange(D.getIdentifierLoc()); 3345 D.setInvalidType(); 3346 } 3347 if (SC == SC_Static) { 3348 if (!D.isInvalidType()) 3349 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 3350 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3351 << SourceRange(D.getIdentifierLoc()); 3352 D.setInvalidType(); 3353 SC = SC_None; 3354 } 3355 3356 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3357 if (FTI.TypeQuals != 0) { 3358 if (FTI.TypeQuals & Qualifiers::Const) 3359 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3360 << "const" << SourceRange(D.getIdentifierLoc()); 3361 if (FTI.TypeQuals & Qualifiers::Volatile) 3362 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3363 << "volatile" << SourceRange(D.getIdentifierLoc()); 3364 if (FTI.TypeQuals & Qualifiers::Restrict) 3365 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 3366 << "restrict" << SourceRange(D.getIdentifierLoc()); 3367 D.setInvalidType(); 3368 } 3369 3370 // C++0x [class.ctor]p4: 3371 // A constructor shall not be declared with a ref-qualifier. 3372 if (FTI.hasRefQualifier()) { 3373 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 3374 << FTI.RefQualifierIsLValueRef 3375 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3376 D.setInvalidType(); 3377 } 3378 3379 // Rebuild the function type "R" without any type qualifiers (in 3380 // case any of the errors above fired) and with "void" as the 3381 // return type, since constructors don't have return types. 3382 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3383 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 3384 return R; 3385 3386 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3387 EPI.TypeQuals = 0; 3388 EPI.RefQualifier = RQ_None; 3389 3390 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 3391 Proto->getNumArgs(), EPI); 3392} 3393 3394/// CheckConstructor - Checks a fully-formed constructor for 3395/// well-formedness, issuing any diagnostics required. Returns true if 3396/// the constructor declarator is invalid. 3397void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 3398 CXXRecordDecl *ClassDecl 3399 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 3400 if (!ClassDecl) 3401 return Constructor->setInvalidDecl(); 3402 3403 // C++ [class.copy]p3: 3404 // A declaration of a constructor for a class X is ill-formed if 3405 // its first parameter is of type (optionally cv-qualified) X and 3406 // either there are no other parameters or else all other 3407 // parameters have default arguments. 3408 if (!Constructor->isInvalidDecl() && 3409 ((Constructor->getNumParams() == 1) || 3410 (Constructor->getNumParams() > 1 && 3411 Constructor->getParamDecl(1)->hasDefaultArg())) && 3412 Constructor->getTemplateSpecializationKind() 3413 != TSK_ImplicitInstantiation) { 3414 QualType ParamType = Constructor->getParamDecl(0)->getType(); 3415 QualType ClassTy = Context.getTagDeclType(ClassDecl); 3416 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 3417 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 3418 const char *ConstRef 3419 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 3420 : " const &"; 3421 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 3422 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 3423 3424 // FIXME: Rather that making the constructor invalid, we should endeavor 3425 // to fix the type. 3426 Constructor->setInvalidDecl(); 3427 } 3428 } 3429} 3430 3431/// CheckDestructor - Checks a fully-formed destructor definition for 3432/// well-formedness, issuing any diagnostics required. Returns true 3433/// on error. 3434bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3435 CXXRecordDecl *RD = Destructor->getParent(); 3436 3437 if (Destructor->isVirtual()) { 3438 SourceLocation Loc; 3439 3440 if (!Destructor->isImplicit()) 3441 Loc = Destructor->getLocation(); 3442 else 3443 Loc = RD->getLocation(); 3444 3445 // If we have a virtual destructor, look up the deallocation function 3446 FunctionDecl *OperatorDelete = 0; 3447 DeclarationName Name = 3448 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3449 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3450 return true; 3451 3452 MarkDeclarationReferenced(Loc, OperatorDelete); 3453 3454 Destructor->setOperatorDelete(OperatorDelete); 3455 } 3456 3457 return false; 3458} 3459 3460static inline bool 3461FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3462 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3463 FTI.ArgInfo[0].Param && 3464 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3465} 3466 3467/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3468/// the well-formednes of the destructor declarator @p D with type @p 3469/// R. If there are any errors in the declarator, this routine will 3470/// emit diagnostics and set the declarator to invalid. Even if this happens, 3471/// will be updated to reflect a well-formed type for the destructor and 3472/// returned. 3473QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3474 StorageClass& SC) { 3475 // C++ [class.dtor]p1: 3476 // [...] A typedef-name that names a class is a class-name 3477 // (7.1.3); however, a typedef-name that names a class shall not 3478 // be used as the identifier in the declarator for a destructor 3479 // declaration. 3480 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3481 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 3482 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3483 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 3484 else if (const TemplateSpecializationType *TST = 3485 DeclaratorType->getAs<TemplateSpecializationType>()) 3486 if (TST->isTypeAlias()) 3487 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3488 << DeclaratorType << 1; 3489 3490 // C++ [class.dtor]p2: 3491 // A destructor is used to destroy objects of its class type. A 3492 // destructor takes no parameters, and no return type can be 3493 // specified for it (not even void). The address of a destructor 3494 // shall not be taken. A destructor shall not be static. A 3495 // destructor can be invoked for a const, volatile or const 3496 // volatile object. A destructor shall not be declared const, 3497 // volatile or const volatile (9.3.2). 3498 if (SC == SC_Static) { 3499 if (!D.isInvalidType()) 3500 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3501 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3502 << SourceRange(D.getIdentifierLoc()) 3503 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3504 3505 SC = SC_None; 3506 } 3507 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3508 // Destructors don't have return types, but the parser will 3509 // happily parse something like: 3510 // 3511 // class X { 3512 // float ~X(); 3513 // }; 3514 // 3515 // The return type will be eliminated later. 3516 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3517 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3518 << SourceRange(D.getIdentifierLoc()); 3519 } 3520 3521 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3522 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3523 if (FTI.TypeQuals & Qualifiers::Const) 3524 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3525 << "const" << SourceRange(D.getIdentifierLoc()); 3526 if (FTI.TypeQuals & Qualifiers::Volatile) 3527 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3528 << "volatile" << SourceRange(D.getIdentifierLoc()); 3529 if (FTI.TypeQuals & Qualifiers::Restrict) 3530 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3531 << "restrict" << SourceRange(D.getIdentifierLoc()); 3532 D.setInvalidType(); 3533 } 3534 3535 // C++0x [class.dtor]p2: 3536 // A destructor shall not be declared with a ref-qualifier. 3537 if (FTI.hasRefQualifier()) { 3538 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 3539 << FTI.RefQualifierIsLValueRef 3540 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 3541 D.setInvalidType(); 3542 } 3543 3544 // Make sure we don't have any parameters. 3545 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3546 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3547 3548 // Delete the parameters. 3549 FTI.freeArgs(); 3550 D.setInvalidType(); 3551 } 3552 3553 // Make sure the destructor isn't variadic. 3554 if (FTI.isVariadic) { 3555 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3556 D.setInvalidType(); 3557 } 3558 3559 // Rebuild the function type "R" without any type qualifiers or 3560 // parameters (in case any of the errors above fired) and with 3561 // "void" as the return type, since destructors don't have return 3562 // types. 3563 if (!D.isInvalidType()) 3564 return R; 3565 3566 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3567 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 3568 EPI.Variadic = false; 3569 EPI.TypeQuals = 0; 3570 EPI.RefQualifier = RQ_None; 3571 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 3572} 3573 3574/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3575/// well-formednes of the conversion function declarator @p D with 3576/// type @p R. If there are any errors in the declarator, this routine 3577/// will emit diagnostics and return true. Otherwise, it will return 3578/// false. Either way, the type @p R will be updated to reflect a 3579/// well-formed type for the conversion operator. 3580void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3581 StorageClass& SC) { 3582 // C++ [class.conv.fct]p1: 3583 // Neither parameter types nor return type can be specified. The 3584 // type of a conversion function (8.3.5) is "function taking no 3585 // parameter returning conversion-type-id." 3586 if (SC == SC_Static) { 3587 if (!D.isInvalidType()) 3588 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3589 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3590 << SourceRange(D.getIdentifierLoc()); 3591 D.setInvalidType(); 3592 SC = SC_None; 3593 } 3594 3595 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3596 3597 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3598 // Conversion functions don't have return types, but the parser will 3599 // happily parse something like: 3600 // 3601 // class X { 3602 // float operator bool(); 3603 // }; 3604 // 3605 // The return type will be changed later anyway. 3606 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3607 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3608 << SourceRange(D.getIdentifierLoc()); 3609 D.setInvalidType(); 3610 } 3611 3612 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3613 3614 // Make sure we don't have any parameters. 3615 if (Proto->getNumArgs() > 0) { 3616 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3617 3618 // Delete the parameters. 3619 D.getFunctionTypeInfo().freeArgs(); 3620 D.setInvalidType(); 3621 } else if (Proto->isVariadic()) { 3622 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3623 D.setInvalidType(); 3624 } 3625 3626 // Diagnose "&operator bool()" and other such nonsense. This 3627 // is actually a gcc extension which we don't support. 3628 if (Proto->getResultType() != ConvType) { 3629 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3630 << Proto->getResultType(); 3631 D.setInvalidType(); 3632 ConvType = Proto->getResultType(); 3633 } 3634 3635 // C++ [class.conv.fct]p4: 3636 // The conversion-type-id shall not represent a function type nor 3637 // an array type. 3638 if (ConvType->isArrayType()) { 3639 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3640 ConvType = Context.getPointerType(ConvType); 3641 D.setInvalidType(); 3642 } else if (ConvType->isFunctionType()) { 3643 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3644 ConvType = Context.getPointerType(ConvType); 3645 D.setInvalidType(); 3646 } 3647 3648 // Rebuild the function type "R" without any parameters (in case any 3649 // of the errors above fired) and with the conversion type as the 3650 // return type. 3651 if (D.isInvalidType()) 3652 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 3653 3654 // C++0x explicit conversion operators. 3655 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3656 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3657 diag::warn_explicit_conversion_functions) 3658 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3659} 3660 3661/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3662/// the declaration of the given C++ conversion function. This routine 3663/// is responsible for recording the conversion function in the C++ 3664/// class, if possible. 3665Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3666 assert(Conversion && "Expected to receive a conversion function declaration"); 3667 3668 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3669 3670 // Make sure we aren't redeclaring the conversion function. 3671 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3672 3673 // C++ [class.conv.fct]p1: 3674 // [...] A conversion function is never used to convert a 3675 // (possibly cv-qualified) object to the (possibly cv-qualified) 3676 // same object type (or a reference to it), to a (possibly 3677 // cv-qualified) base class of that type (or a reference to it), 3678 // or to (possibly cv-qualified) void. 3679 // FIXME: Suppress this warning if the conversion function ends up being a 3680 // virtual function that overrides a virtual function in a base class. 3681 QualType ClassType 3682 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3683 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3684 ConvType = ConvTypeRef->getPointeeType(); 3685 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 3686 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 3687 /* Suppress diagnostics for instantiations. */; 3688 else if (ConvType->isRecordType()) { 3689 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3690 if (ConvType == ClassType) 3691 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3692 << ClassType; 3693 else if (IsDerivedFrom(ClassType, ConvType)) 3694 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3695 << ClassType << ConvType; 3696 } else if (ConvType->isVoidType()) { 3697 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3698 << ClassType << ConvType; 3699 } 3700 3701 if (FunctionTemplateDecl *ConversionTemplate 3702 = Conversion->getDescribedFunctionTemplate()) 3703 return ConversionTemplate; 3704 3705 return Conversion; 3706} 3707 3708//===----------------------------------------------------------------------===// 3709// Namespace Handling 3710//===----------------------------------------------------------------------===// 3711 3712 3713 3714/// ActOnStartNamespaceDef - This is called at the start of a namespace 3715/// definition. 3716Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3717 SourceLocation InlineLoc, 3718 SourceLocation NamespaceLoc, 3719 SourceLocation IdentLoc, 3720 IdentifierInfo *II, 3721 SourceLocation LBrace, 3722 AttributeList *AttrList) { 3723 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 3724 // For anonymous namespace, take the location of the left brace. 3725 SourceLocation Loc = II ? IdentLoc : LBrace; 3726 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3727 StartLoc, Loc, II); 3728 Namespc->setInline(InlineLoc.isValid()); 3729 3730 Scope *DeclRegionScope = NamespcScope->getParent(); 3731 3732 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3733 3734 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 3735 PushNamespaceVisibilityAttr(Attr); 3736 3737 if (II) { 3738 // C++ [namespace.def]p2: 3739 // The identifier in an original-namespace-definition shall not 3740 // have been previously defined in the declarative region in 3741 // which the original-namespace-definition appears. The 3742 // identifier in an original-namespace-definition is the name of 3743 // the namespace. Subsequently in that declarative region, it is 3744 // treated as an original-namespace-name. 3745 // 3746 // Since namespace names are unique in their scope, and we don't 3747 // look through using directives, just look for any ordinary names. 3748 3749 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 3750 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 3751 Decl::IDNS_Namespace; 3752 NamedDecl *PrevDecl = 0; 3753 for (DeclContext::lookup_result R 3754 = CurContext->getRedeclContext()->lookup(II); 3755 R.first != R.second; ++R.first) { 3756 if ((*R.first)->getIdentifierNamespace() & IDNS) { 3757 PrevDecl = *R.first; 3758 break; 3759 } 3760 } 3761 3762 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3763 // This is an extended namespace definition. 3764 if (Namespc->isInline() != OrigNS->isInline()) { 3765 // inline-ness must match 3766 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3767 << Namespc->isInline(); 3768 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3769 Namespc->setInvalidDecl(); 3770 // Recover by ignoring the new namespace's inline status. 3771 Namespc->setInline(OrigNS->isInline()); 3772 } 3773 3774 // Attach this namespace decl to the chain of extended namespace 3775 // definitions. 3776 OrigNS->setNextNamespace(Namespc); 3777 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3778 3779 // Remove the previous declaration from the scope. 3780 if (DeclRegionScope->isDeclScope(OrigNS)) { 3781 IdResolver.RemoveDecl(OrigNS); 3782 DeclRegionScope->RemoveDecl(OrigNS); 3783 } 3784 } else if (PrevDecl) { 3785 // This is an invalid name redefinition. 3786 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3787 << Namespc->getDeclName(); 3788 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3789 Namespc->setInvalidDecl(); 3790 // Continue on to push Namespc as current DeclContext and return it. 3791 } else if (II->isStr("std") && 3792 CurContext->getRedeclContext()->isTranslationUnit()) { 3793 // This is the first "real" definition of the namespace "std", so update 3794 // our cache of the "std" namespace to point at this definition. 3795 if (NamespaceDecl *StdNS = getStdNamespace()) { 3796 // We had already defined a dummy namespace "std". Link this new 3797 // namespace definition to the dummy namespace "std". 3798 StdNS->setNextNamespace(Namespc); 3799 StdNS->setLocation(IdentLoc); 3800 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3801 } 3802 3803 // Make our StdNamespace cache point at the first real definition of the 3804 // "std" namespace. 3805 StdNamespace = Namespc; 3806 } 3807 3808 PushOnScopeChains(Namespc, DeclRegionScope); 3809 } else { 3810 // Anonymous namespaces. 3811 assert(Namespc->isAnonymousNamespace()); 3812 3813 // Link the anonymous namespace into its parent. 3814 NamespaceDecl *PrevDecl; 3815 DeclContext *Parent = CurContext->getRedeclContext(); 3816 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3817 PrevDecl = TU->getAnonymousNamespace(); 3818 TU->setAnonymousNamespace(Namespc); 3819 } else { 3820 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3821 PrevDecl = ND->getAnonymousNamespace(); 3822 ND->setAnonymousNamespace(Namespc); 3823 } 3824 3825 // Link the anonymous namespace with its previous declaration. 3826 if (PrevDecl) { 3827 assert(PrevDecl->isAnonymousNamespace()); 3828 assert(!PrevDecl->getNextNamespace()); 3829 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3830 PrevDecl->setNextNamespace(Namespc); 3831 3832 if (Namespc->isInline() != PrevDecl->isInline()) { 3833 // inline-ness must match 3834 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3835 << Namespc->isInline(); 3836 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3837 Namespc->setInvalidDecl(); 3838 // Recover by ignoring the new namespace's inline status. 3839 Namespc->setInline(PrevDecl->isInline()); 3840 } 3841 } 3842 3843 CurContext->addDecl(Namespc); 3844 3845 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3846 // behaves as if it were replaced by 3847 // namespace unique { /* empty body */ } 3848 // using namespace unique; 3849 // namespace unique { namespace-body } 3850 // where all occurrences of 'unique' in a translation unit are 3851 // replaced by the same identifier and this identifier differs 3852 // from all other identifiers in the entire program. 3853 3854 // We just create the namespace with an empty name and then add an 3855 // implicit using declaration, just like the standard suggests. 3856 // 3857 // CodeGen enforces the "universally unique" aspect by giving all 3858 // declarations semantically contained within an anonymous 3859 // namespace internal linkage. 3860 3861 if (!PrevDecl) { 3862 UsingDirectiveDecl* UD 3863 = UsingDirectiveDecl::Create(Context, CurContext, 3864 /* 'using' */ LBrace, 3865 /* 'namespace' */ SourceLocation(), 3866 /* qualifier */ NestedNameSpecifierLoc(), 3867 /* identifier */ SourceLocation(), 3868 Namespc, 3869 /* Ancestor */ CurContext); 3870 UD->setImplicit(); 3871 CurContext->addDecl(UD); 3872 } 3873 } 3874 3875 // Although we could have an invalid decl (i.e. the namespace name is a 3876 // redefinition), push it as current DeclContext and try to continue parsing. 3877 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3878 // for the namespace has the declarations that showed up in that particular 3879 // namespace definition. 3880 PushDeclContext(NamespcScope, Namespc); 3881 return Namespc; 3882} 3883 3884/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3885/// is a namespace alias, returns the namespace it points to. 3886static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3887 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3888 return AD->getNamespace(); 3889 return dyn_cast_or_null<NamespaceDecl>(D); 3890} 3891 3892/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3893/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3894void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3895 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3896 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3897 Namespc->setRBraceLoc(RBrace); 3898 PopDeclContext(); 3899 if (Namespc->hasAttr<VisibilityAttr>()) 3900 PopPragmaVisibility(); 3901} 3902 3903CXXRecordDecl *Sema::getStdBadAlloc() const { 3904 return cast_or_null<CXXRecordDecl>( 3905 StdBadAlloc.get(Context.getExternalSource())); 3906} 3907 3908NamespaceDecl *Sema::getStdNamespace() const { 3909 return cast_or_null<NamespaceDecl>( 3910 StdNamespace.get(Context.getExternalSource())); 3911} 3912 3913/// \brief Retrieve the special "std" namespace, which may require us to 3914/// implicitly define the namespace. 3915NamespaceDecl *Sema::getOrCreateStdNamespace() { 3916 if (!StdNamespace) { 3917 // The "std" namespace has not yet been defined, so build one implicitly. 3918 StdNamespace = NamespaceDecl::Create(Context, 3919 Context.getTranslationUnitDecl(), 3920 SourceLocation(), SourceLocation(), 3921 &PP.getIdentifierTable().get("std")); 3922 getStdNamespace()->setImplicit(true); 3923 } 3924 3925 return getStdNamespace(); 3926} 3927 3928/// \brief Determine whether a using statement is in a context where it will be 3929/// apply in all contexts. 3930static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 3931 switch (CurContext->getDeclKind()) { 3932 case Decl::TranslationUnit: 3933 return true; 3934 case Decl::LinkageSpec: 3935 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 3936 default: 3937 return false; 3938 } 3939} 3940 3941Decl *Sema::ActOnUsingDirective(Scope *S, 3942 SourceLocation UsingLoc, 3943 SourceLocation NamespcLoc, 3944 CXXScopeSpec &SS, 3945 SourceLocation IdentLoc, 3946 IdentifierInfo *NamespcName, 3947 AttributeList *AttrList) { 3948 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3949 assert(NamespcName && "Invalid NamespcName."); 3950 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3951 3952 // This can only happen along a recovery path. 3953 while (S->getFlags() & Scope::TemplateParamScope) 3954 S = S->getParent(); 3955 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3956 3957 UsingDirectiveDecl *UDir = 0; 3958 NestedNameSpecifier *Qualifier = 0; 3959 if (SS.isSet()) 3960 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3961 3962 // Lookup namespace name. 3963 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3964 LookupParsedName(R, S, &SS); 3965 if (R.isAmbiguous()) 3966 return 0; 3967 3968 if (R.empty()) { 3969 // Allow "using namespace std;" or "using namespace ::std;" even if 3970 // "std" hasn't been defined yet, for GCC compatibility. 3971 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3972 NamespcName->isStr("std")) { 3973 Diag(IdentLoc, diag::ext_using_undefined_std); 3974 R.addDecl(getOrCreateStdNamespace()); 3975 R.resolveKind(); 3976 } 3977 // Otherwise, attempt typo correction. 3978 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3979 CTC_NoKeywords, 0)) { 3980 if (R.getAsSingle<NamespaceDecl>() || 3981 R.getAsSingle<NamespaceAliasDecl>()) { 3982 if (DeclContext *DC = computeDeclContext(SS, false)) 3983 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3984 << NamespcName << DC << Corrected << SS.getRange() 3985 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3986 else 3987 Diag(IdentLoc, diag::err_using_directive_suggest) 3988 << NamespcName << Corrected 3989 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3990 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3991 << Corrected; 3992 3993 NamespcName = Corrected.getAsIdentifierInfo(); 3994 } else { 3995 R.clear(); 3996 R.setLookupName(NamespcName); 3997 } 3998 } 3999 } 4000 4001 if (!R.empty()) { 4002 NamedDecl *Named = R.getFoundDecl(); 4003 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4004 && "expected namespace decl"); 4005 // C++ [namespace.udir]p1: 4006 // A using-directive specifies that the names in the nominated 4007 // namespace can be used in the scope in which the 4008 // using-directive appears after the using-directive. During 4009 // unqualified name lookup (3.4.1), the names appear as if they 4010 // were declared in the nearest enclosing namespace which 4011 // contains both the using-directive and the nominated 4012 // namespace. [Note: in this context, "contains" means "contains 4013 // directly or indirectly". ] 4014 4015 // Find enclosing context containing both using-directive and 4016 // nominated namespace. 4017 NamespaceDecl *NS = getNamespaceDecl(Named); 4018 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4019 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4020 CommonAncestor = CommonAncestor->getParent(); 4021 4022 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4023 SS.getWithLocInContext(Context), 4024 IdentLoc, Named, CommonAncestor); 4025 4026 if (IsUsingDirectiveInToplevelContext(CurContext) && 4027 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4028 Diag(IdentLoc, diag::warn_using_directive_in_header); 4029 } 4030 4031 PushUsingDirective(S, UDir); 4032 } else { 4033 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4034 } 4035 4036 // FIXME: We ignore attributes for now. 4037 return UDir; 4038} 4039 4040void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4041 // If scope has associated entity, then using directive is at namespace 4042 // or translation unit scope. We add UsingDirectiveDecls, into 4043 // it's lookup structure. 4044 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4045 Ctx->addDecl(UDir); 4046 else 4047 // Otherwise it is block-sope. using-directives will affect lookup 4048 // only to the end of scope. 4049 S->PushUsingDirective(UDir); 4050} 4051 4052 4053Decl *Sema::ActOnUsingDeclaration(Scope *S, 4054 AccessSpecifier AS, 4055 bool HasUsingKeyword, 4056 SourceLocation UsingLoc, 4057 CXXScopeSpec &SS, 4058 UnqualifiedId &Name, 4059 AttributeList *AttrList, 4060 bool IsTypeName, 4061 SourceLocation TypenameLoc) { 4062 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4063 4064 switch (Name.getKind()) { 4065 case UnqualifiedId::IK_Identifier: 4066 case UnqualifiedId::IK_OperatorFunctionId: 4067 case UnqualifiedId::IK_LiteralOperatorId: 4068 case UnqualifiedId::IK_ConversionFunctionId: 4069 break; 4070 4071 case UnqualifiedId::IK_ConstructorName: 4072 case UnqualifiedId::IK_ConstructorTemplateId: 4073 // C++0x inherited constructors. 4074 if (getLangOptions().CPlusPlus0x) break; 4075 4076 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4077 << SS.getRange(); 4078 return 0; 4079 4080 case UnqualifiedId::IK_DestructorName: 4081 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4082 << SS.getRange(); 4083 return 0; 4084 4085 case UnqualifiedId::IK_TemplateId: 4086 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4087 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4088 return 0; 4089 } 4090 4091 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 4092 DeclarationName TargetName = TargetNameInfo.getName(); 4093 if (!TargetName) 4094 return 0; 4095 4096 // Warn about using declarations. 4097 // TODO: store that the declaration was written without 'using' and 4098 // talk about access decls instead of using decls in the 4099 // diagnostics. 4100 if (!HasUsingKeyword) { 4101 UsingLoc = Name.getSourceRange().getBegin(); 4102 4103 Diag(UsingLoc, diag::warn_access_decl_deprecated) 4104 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 4105 } 4106 4107 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 4108 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 4109 return 0; 4110 4111 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 4112 TargetNameInfo, AttrList, 4113 /* IsInstantiation */ false, 4114 IsTypeName, TypenameLoc); 4115 if (UD) 4116 PushOnScopeChains(UD, S, /*AddToContext*/ false); 4117 4118 return UD; 4119} 4120 4121/// \brief Determine whether a using declaration considers the given 4122/// declarations as "equivalent", e.g., if they are redeclarations of 4123/// the same entity or are both typedefs of the same type. 4124static bool 4125IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 4126 bool &SuppressRedeclaration) { 4127 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 4128 SuppressRedeclaration = false; 4129 return true; 4130 } 4131 4132 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 4133 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 4134 SuppressRedeclaration = true; 4135 return Context.hasSameType(TD1->getUnderlyingType(), 4136 TD2->getUnderlyingType()); 4137 } 4138 4139 return false; 4140} 4141 4142 4143/// Determines whether to create a using shadow decl for a particular 4144/// decl, given the set of decls existing prior to this using lookup. 4145bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 4146 const LookupResult &Previous) { 4147 // Diagnose finding a decl which is not from a base class of the 4148 // current class. We do this now because there are cases where this 4149 // function will silently decide not to build a shadow decl, which 4150 // will pre-empt further diagnostics. 4151 // 4152 // We don't need to do this in C++0x because we do the check once on 4153 // the qualifier. 4154 // 4155 // FIXME: diagnose the following if we care enough: 4156 // struct A { int foo; }; 4157 // struct B : A { using A::foo; }; 4158 // template <class T> struct C : A {}; 4159 // template <class T> struct D : C<T> { using B::foo; } // <--- 4160 // This is invalid (during instantiation) in C++03 because B::foo 4161 // resolves to the using decl in B, which is not a base class of D<T>. 4162 // We can't diagnose it immediately because C<T> is an unknown 4163 // specialization. The UsingShadowDecl in D<T> then points directly 4164 // to A::foo, which will look well-formed when we instantiate. 4165 // The right solution is to not collapse the shadow-decl chain. 4166 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 4167 DeclContext *OrigDC = Orig->getDeclContext(); 4168 4169 // Handle enums and anonymous structs. 4170 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 4171 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 4172 while (OrigRec->isAnonymousStructOrUnion()) 4173 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 4174 4175 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 4176 if (OrigDC == CurContext) { 4177 Diag(Using->getLocation(), 4178 diag::err_using_decl_nested_name_specifier_is_current_class) 4179 << Using->getQualifierLoc().getSourceRange(); 4180 Diag(Orig->getLocation(), diag::note_using_decl_target); 4181 return true; 4182 } 4183 4184 Diag(Using->getQualifierLoc().getBeginLoc(), 4185 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4186 << Using->getQualifier() 4187 << cast<CXXRecordDecl>(CurContext) 4188 << Using->getQualifierLoc().getSourceRange(); 4189 Diag(Orig->getLocation(), diag::note_using_decl_target); 4190 return true; 4191 } 4192 } 4193 4194 if (Previous.empty()) return false; 4195 4196 NamedDecl *Target = Orig; 4197 if (isa<UsingShadowDecl>(Target)) 4198 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4199 4200 // If the target happens to be one of the previous declarations, we 4201 // don't have a conflict. 4202 // 4203 // FIXME: but we might be increasing its access, in which case we 4204 // should redeclare it. 4205 NamedDecl *NonTag = 0, *Tag = 0; 4206 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 4207 I != E; ++I) { 4208 NamedDecl *D = (*I)->getUnderlyingDecl(); 4209 bool Result; 4210 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 4211 return Result; 4212 4213 (isa<TagDecl>(D) ? Tag : NonTag) = D; 4214 } 4215 4216 if (Target->isFunctionOrFunctionTemplate()) { 4217 FunctionDecl *FD; 4218 if (isa<FunctionTemplateDecl>(Target)) 4219 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 4220 else 4221 FD = cast<FunctionDecl>(Target); 4222 4223 NamedDecl *OldDecl = 0; 4224 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 4225 case Ovl_Overload: 4226 return false; 4227 4228 case Ovl_NonFunction: 4229 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4230 break; 4231 4232 // We found a decl with the exact signature. 4233 case Ovl_Match: 4234 // If we're in a record, we want to hide the target, so we 4235 // return true (without a diagnostic) to tell the caller not to 4236 // build a shadow decl. 4237 if (CurContext->isRecord()) 4238 return true; 4239 4240 // If we're not in a record, this is an error. 4241 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4242 break; 4243 } 4244 4245 Diag(Target->getLocation(), diag::note_using_decl_target); 4246 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 4247 return true; 4248 } 4249 4250 // Target is not a function. 4251 4252 if (isa<TagDecl>(Target)) { 4253 // No conflict between a tag and a non-tag. 4254 if (!Tag) return false; 4255 4256 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4257 Diag(Target->getLocation(), diag::note_using_decl_target); 4258 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 4259 return true; 4260 } 4261 4262 // No conflict between a tag and a non-tag. 4263 if (!NonTag) return false; 4264 4265 Diag(Using->getLocation(), diag::err_using_decl_conflict); 4266 Diag(Target->getLocation(), diag::note_using_decl_target); 4267 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 4268 return true; 4269} 4270 4271/// Builds a shadow declaration corresponding to a 'using' declaration. 4272UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 4273 UsingDecl *UD, 4274 NamedDecl *Orig) { 4275 4276 // If we resolved to another shadow declaration, just coalesce them. 4277 NamedDecl *Target = Orig; 4278 if (isa<UsingShadowDecl>(Target)) { 4279 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 4280 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 4281 } 4282 4283 UsingShadowDecl *Shadow 4284 = UsingShadowDecl::Create(Context, CurContext, 4285 UD->getLocation(), UD, Target); 4286 UD->addShadowDecl(Shadow); 4287 4288 Shadow->setAccess(UD->getAccess()); 4289 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 4290 Shadow->setInvalidDecl(); 4291 4292 if (S) 4293 PushOnScopeChains(Shadow, S); 4294 else 4295 CurContext->addDecl(Shadow); 4296 4297 4298 return Shadow; 4299} 4300 4301/// Hides a using shadow declaration. This is required by the current 4302/// using-decl implementation when a resolvable using declaration in a 4303/// class is followed by a declaration which would hide or override 4304/// one or more of the using decl's targets; for example: 4305/// 4306/// struct Base { void foo(int); }; 4307/// struct Derived : Base { 4308/// using Base::foo; 4309/// void foo(int); 4310/// }; 4311/// 4312/// The governing language is C++03 [namespace.udecl]p12: 4313/// 4314/// When a using-declaration brings names from a base class into a 4315/// derived class scope, member functions in the derived class 4316/// override and/or hide member functions with the same name and 4317/// parameter types in a base class (rather than conflicting). 4318/// 4319/// There are two ways to implement this: 4320/// (1) optimistically create shadow decls when they're not hidden 4321/// by existing declarations, or 4322/// (2) don't create any shadow decls (or at least don't make them 4323/// visible) until we've fully parsed/instantiated the class. 4324/// The problem with (1) is that we might have to retroactively remove 4325/// a shadow decl, which requires several O(n) operations because the 4326/// decl structures are (very reasonably) not designed for removal. 4327/// (2) avoids this but is very fiddly and phase-dependent. 4328void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 4329 if (Shadow->getDeclName().getNameKind() == 4330 DeclarationName::CXXConversionFunctionName) 4331 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 4332 4333 // Remove it from the DeclContext... 4334 Shadow->getDeclContext()->removeDecl(Shadow); 4335 4336 // ...and the scope, if applicable... 4337 if (S) { 4338 S->RemoveDecl(Shadow); 4339 IdResolver.RemoveDecl(Shadow); 4340 } 4341 4342 // ...and the using decl. 4343 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 4344 4345 // TODO: complain somehow if Shadow was used. It shouldn't 4346 // be possible for this to happen, because...? 4347} 4348 4349/// Builds a using declaration. 4350/// 4351/// \param IsInstantiation - Whether this call arises from an 4352/// instantiation of an unresolved using declaration. We treat 4353/// the lookup differently for these declarations. 4354NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 4355 SourceLocation UsingLoc, 4356 CXXScopeSpec &SS, 4357 const DeclarationNameInfo &NameInfo, 4358 AttributeList *AttrList, 4359 bool IsInstantiation, 4360 bool IsTypeName, 4361 SourceLocation TypenameLoc) { 4362 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4363 SourceLocation IdentLoc = NameInfo.getLoc(); 4364 assert(IdentLoc.isValid() && "Invalid TargetName location."); 4365 4366 // FIXME: We ignore attributes for now. 4367 4368 if (SS.isEmpty()) { 4369 Diag(IdentLoc, diag::err_using_requires_qualname); 4370 return 0; 4371 } 4372 4373 // Do the redeclaration lookup in the current scope. 4374 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 4375 ForRedeclaration); 4376 Previous.setHideTags(false); 4377 if (S) { 4378 LookupName(Previous, S); 4379 4380 // It is really dumb that we have to do this. 4381 LookupResult::Filter F = Previous.makeFilter(); 4382 while (F.hasNext()) { 4383 NamedDecl *D = F.next(); 4384 if (!isDeclInScope(D, CurContext, S)) 4385 F.erase(); 4386 } 4387 F.done(); 4388 } else { 4389 assert(IsInstantiation && "no scope in non-instantiation"); 4390 assert(CurContext->isRecord() && "scope not record in instantiation"); 4391 LookupQualifiedName(Previous, CurContext); 4392 } 4393 4394 // Check for invalid redeclarations. 4395 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 4396 return 0; 4397 4398 // Check for bad qualifiers. 4399 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 4400 return 0; 4401 4402 DeclContext *LookupContext = computeDeclContext(SS); 4403 NamedDecl *D; 4404 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 4405 if (!LookupContext) { 4406 if (IsTypeName) { 4407 // FIXME: not all declaration name kinds are legal here 4408 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 4409 UsingLoc, TypenameLoc, 4410 QualifierLoc, 4411 IdentLoc, NameInfo.getName()); 4412 } else { 4413 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 4414 QualifierLoc, NameInfo); 4415 } 4416 } else { 4417 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 4418 NameInfo, IsTypeName); 4419 } 4420 D->setAccess(AS); 4421 CurContext->addDecl(D); 4422 4423 if (!LookupContext) return D; 4424 UsingDecl *UD = cast<UsingDecl>(D); 4425 4426 if (RequireCompleteDeclContext(SS, LookupContext)) { 4427 UD->setInvalidDecl(); 4428 return UD; 4429 } 4430 4431 // Constructor inheriting using decls get special treatment. 4432 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 4433 if (CheckInheritedConstructorUsingDecl(UD)) 4434 UD->setInvalidDecl(); 4435 return UD; 4436 } 4437 4438 // Otherwise, look up the target name. 4439 4440 LookupResult R(*this, NameInfo, LookupOrdinaryName); 4441 4442 // Unlike most lookups, we don't always want to hide tag 4443 // declarations: tag names are visible through the using declaration 4444 // even if hidden by ordinary names, *except* in a dependent context 4445 // where it's important for the sanity of two-phase lookup. 4446 if (!IsInstantiation) 4447 R.setHideTags(false); 4448 4449 LookupQualifiedName(R, LookupContext); 4450 4451 if (R.empty()) { 4452 Diag(IdentLoc, diag::err_no_member) 4453 << NameInfo.getName() << LookupContext << SS.getRange(); 4454 UD->setInvalidDecl(); 4455 return UD; 4456 } 4457 4458 if (R.isAmbiguous()) { 4459 UD->setInvalidDecl(); 4460 return UD; 4461 } 4462 4463 if (IsTypeName) { 4464 // If we asked for a typename and got a non-type decl, error out. 4465 if (!R.getAsSingle<TypeDecl>()) { 4466 Diag(IdentLoc, diag::err_using_typename_non_type); 4467 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 4468 Diag((*I)->getUnderlyingDecl()->getLocation(), 4469 diag::note_using_decl_target); 4470 UD->setInvalidDecl(); 4471 return UD; 4472 } 4473 } else { 4474 // If we asked for a non-typename and we got a type, error out, 4475 // but only if this is an instantiation of an unresolved using 4476 // decl. Otherwise just silently find the type name. 4477 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4478 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4479 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4480 UD->setInvalidDecl(); 4481 return UD; 4482 } 4483 } 4484 4485 // C++0x N2914 [namespace.udecl]p6: 4486 // A using-declaration shall not name a namespace. 4487 if (R.getAsSingle<NamespaceDecl>()) { 4488 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4489 << SS.getRange(); 4490 UD->setInvalidDecl(); 4491 return UD; 4492 } 4493 4494 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4495 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4496 BuildUsingShadowDecl(S, UD, *I); 4497 } 4498 4499 return UD; 4500} 4501 4502/// Additional checks for a using declaration referring to a constructor name. 4503bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 4504 if (UD->isTypeName()) { 4505 // FIXME: Cannot specify typename when specifying constructor 4506 return true; 4507 } 4508 4509 const Type *SourceType = UD->getQualifier()->getAsType(); 4510 assert(SourceType && 4511 "Using decl naming constructor doesn't have type in scope spec."); 4512 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 4513 4514 // Check whether the named type is a direct base class. 4515 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 4516 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 4517 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 4518 BaseIt != BaseE; ++BaseIt) { 4519 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 4520 if (CanonicalSourceType == BaseType) 4521 break; 4522 } 4523 4524 if (BaseIt == BaseE) { 4525 // Did not find SourceType in the bases. 4526 Diag(UD->getUsingLocation(), 4527 diag::err_using_decl_constructor_not_in_direct_base) 4528 << UD->getNameInfo().getSourceRange() 4529 << QualType(SourceType, 0) << TargetClass; 4530 return true; 4531 } 4532 4533 BaseIt->setInheritConstructors(); 4534 4535 return false; 4536} 4537 4538/// Checks that the given using declaration is not an invalid 4539/// redeclaration. Note that this is checking only for the using decl 4540/// itself, not for any ill-formedness among the UsingShadowDecls. 4541bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4542 bool isTypeName, 4543 const CXXScopeSpec &SS, 4544 SourceLocation NameLoc, 4545 const LookupResult &Prev) { 4546 // C++03 [namespace.udecl]p8: 4547 // C++0x [namespace.udecl]p10: 4548 // A using-declaration is a declaration and can therefore be used 4549 // repeatedly where (and only where) multiple declarations are 4550 // allowed. 4551 // 4552 // That's in non-member contexts. 4553 if (!CurContext->getRedeclContext()->isRecord()) 4554 return false; 4555 4556 NestedNameSpecifier *Qual 4557 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4558 4559 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4560 NamedDecl *D = *I; 4561 4562 bool DTypename; 4563 NestedNameSpecifier *DQual; 4564 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4565 DTypename = UD->isTypeName(); 4566 DQual = UD->getQualifier(); 4567 } else if (UnresolvedUsingValueDecl *UD 4568 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4569 DTypename = false; 4570 DQual = UD->getQualifier(); 4571 } else if (UnresolvedUsingTypenameDecl *UD 4572 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4573 DTypename = true; 4574 DQual = UD->getQualifier(); 4575 } else continue; 4576 4577 // using decls differ if one says 'typename' and the other doesn't. 4578 // FIXME: non-dependent using decls? 4579 if (isTypeName != DTypename) continue; 4580 4581 // using decls differ if they name different scopes (but note that 4582 // template instantiation can cause this check to trigger when it 4583 // didn't before instantiation). 4584 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4585 Context.getCanonicalNestedNameSpecifier(DQual)) 4586 continue; 4587 4588 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4589 Diag(D->getLocation(), diag::note_using_decl) << 1; 4590 return true; 4591 } 4592 4593 return false; 4594} 4595 4596 4597/// Checks that the given nested-name qualifier used in a using decl 4598/// in the current context is appropriately related to the current 4599/// scope. If an error is found, diagnoses it and returns true. 4600bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4601 const CXXScopeSpec &SS, 4602 SourceLocation NameLoc) { 4603 DeclContext *NamedContext = computeDeclContext(SS); 4604 4605 if (!CurContext->isRecord()) { 4606 // C++03 [namespace.udecl]p3: 4607 // C++0x [namespace.udecl]p8: 4608 // A using-declaration for a class member shall be a member-declaration. 4609 4610 // If we weren't able to compute a valid scope, it must be a 4611 // dependent class scope. 4612 if (!NamedContext || NamedContext->isRecord()) { 4613 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4614 << SS.getRange(); 4615 return true; 4616 } 4617 4618 // Otherwise, everything is known to be fine. 4619 return false; 4620 } 4621 4622 // The current scope is a record. 4623 4624 // If the named context is dependent, we can't decide much. 4625 if (!NamedContext) { 4626 // FIXME: in C++0x, we can diagnose if we can prove that the 4627 // nested-name-specifier does not refer to a base class, which is 4628 // still possible in some cases. 4629 4630 // Otherwise we have to conservatively report that things might be 4631 // okay. 4632 return false; 4633 } 4634 4635 if (!NamedContext->isRecord()) { 4636 // Ideally this would point at the last name in the specifier, 4637 // but we don't have that level of source info. 4638 Diag(SS.getRange().getBegin(), 4639 diag::err_using_decl_nested_name_specifier_is_not_class) 4640 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4641 return true; 4642 } 4643 4644 if (!NamedContext->isDependentContext() && 4645 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 4646 return true; 4647 4648 if (getLangOptions().CPlusPlus0x) { 4649 // C++0x [namespace.udecl]p3: 4650 // In a using-declaration used as a member-declaration, the 4651 // nested-name-specifier shall name a base class of the class 4652 // being defined. 4653 4654 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4655 cast<CXXRecordDecl>(NamedContext))) { 4656 if (CurContext == NamedContext) { 4657 Diag(NameLoc, 4658 diag::err_using_decl_nested_name_specifier_is_current_class) 4659 << SS.getRange(); 4660 return true; 4661 } 4662 4663 Diag(SS.getRange().getBegin(), 4664 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4665 << (NestedNameSpecifier*) SS.getScopeRep() 4666 << cast<CXXRecordDecl>(CurContext) 4667 << SS.getRange(); 4668 return true; 4669 } 4670 4671 return false; 4672 } 4673 4674 // C++03 [namespace.udecl]p4: 4675 // A using-declaration used as a member-declaration shall refer 4676 // to a member of a base class of the class being defined [etc.]. 4677 4678 // Salient point: SS doesn't have to name a base class as long as 4679 // lookup only finds members from base classes. Therefore we can 4680 // diagnose here only if we can prove that that can't happen, 4681 // i.e. if the class hierarchies provably don't intersect. 4682 4683 // TODO: it would be nice if "definitely valid" results were cached 4684 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4685 // need to be repeated. 4686 4687 struct UserData { 4688 llvm::DenseSet<const CXXRecordDecl*> Bases; 4689 4690 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4691 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4692 Data->Bases.insert(Base); 4693 return true; 4694 } 4695 4696 bool hasDependentBases(const CXXRecordDecl *Class) { 4697 return !Class->forallBases(collect, this); 4698 } 4699 4700 /// Returns true if the base is dependent or is one of the 4701 /// accumulated base classes. 4702 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4703 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4704 return !Data->Bases.count(Base); 4705 } 4706 4707 bool mightShareBases(const CXXRecordDecl *Class) { 4708 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4709 } 4710 }; 4711 4712 UserData Data; 4713 4714 // Returns false if we find a dependent base. 4715 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4716 return false; 4717 4718 // Returns false if the class has a dependent base or if it or one 4719 // of its bases is present in the base set of the current context. 4720 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4721 return false; 4722 4723 Diag(SS.getRange().getBegin(), 4724 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4725 << (NestedNameSpecifier*) SS.getScopeRep() 4726 << cast<CXXRecordDecl>(CurContext) 4727 << SS.getRange(); 4728 4729 return true; 4730} 4731 4732Decl *Sema::ActOnAliasDeclaration(Scope *S, 4733 AccessSpecifier AS, 4734 MultiTemplateParamsArg TemplateParamLists, 4735 SourceLocation UsingLoc, 4736 UnqualifiedId &Name, 4737 TypeResult Type) { 4738 // Skip up to the relevant declaration scope. 4739 while (S->getFlags() & Scope::TemplateParamScope) 4740 S = S->getParent(); 4741 assert((S->getFlags() & Scope::DeclScope) && 4742 "got alias-declaration outside of declaration scope"); 4743 4744 if (Type.isInvalid()) 4745 return 0; 4746 4747 bool Invalid = false; 4748 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 4749 TypeSourceInfo *TInfo = 0; 4750 GetTypeFromParser(Type.get(), &TInfo); 4751 4752 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 4753 return 0; 4754 4755 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 4756 UPPC_DeclarationType)) { 4757 Invalid = true; 4758 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 4759 TInfo->getTypeLoc().getBeginLoc()); 4760 } 4761 4762 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 4763 LookupName(Previous, S); 4764 4765 // Warn about shadowing the name of a template parameter. 4766 if (Previous.isSingleResult() && 4767 Previous.getFoundDecl()->isTemplateParameter()) { 4768 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 4769 Previous.getFoundDecl())) 4770 Invalid = true; 4771 Previous.clear(); 4772 } 4773 4774 assert(Name.Kind == UnqualifiedId::IK_Identifier && 4775 "name in alias declaration must be an identifier"); 4776 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 4777 Name.StartLocation, 4778 Name.Identifier, TInfo); 4779 4780 NewTD->setAccess(AS); 4781 4782 if (Invalid) 4783 NewTD->setInvalidDecl(); 4784 4785 CheckTypedefForVariablyModifiedType(S, NewTD); 4786 Invalid |= NewTD->isInvalidDecl(); 4787 4788 bool Redeclaration = false; 4789 4790 NamedDecl *NewND; 4791 if (TemplateParamLists.size()) { 4792 TypeAliasTemplateDecl *OldDecl = 0; 4793 TemplateParameterList *OldTemplateParams = 0; 4794 4795 if (TemplateParamLists.size() != 1) { 4796 Diag(UsingLoc, diag::err_alias_template_extra_headers) 4797 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 4798 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 4799 } 4800 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 4801 4802 // Only consider previous declarations in the same scope. 4803 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 4804 /*ExplicitInstantiationOrSpecialization*/false); 4805 if (!Previous.empty()) { 4806 Redeclaration = true; 4807 4808 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 4809 if (!OldDecl && !Invalid) { 4810 Diag(UsingLoc, diag::err_redefinition_different_kind) 4811 << Name.Identifier; 4812 4813 NamedDecl *OldD = Previous.getRepresentativeDecl(); 4814 if (OldD->getLocation().isValid()) 4815 Diag(OldD->getLocation(), diag::note_previous_definition); 4816 4817 Invalid = true; 4818 } 4819 4820 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 4821 if (TemplateParameterListsAreEqual(TemplateParams, 4822 OldDecl->getTemplateParameters(), 4823 /*Complain=*/true, 4824 TPL_TemplateMatch)) 4825 OldTemplateParams = OldDecl->getTemplateParameters(); 4826 else 4827 Invalid = true; 4828 4829 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 4830 if (!Invalid && 4831 !Context.hasSameType(OldTD->getUnderlyingType(), 4832 NewTD->getUnderlyingType())) { 4833 // FIXME: The C++0x standard does not clearly say this is ill-formed, 4834 // but we can't reasonably accept it. 4835 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 4836 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 4837 if (OldTD->getLocation().isValid()) 4838 Diag(OldTD->getLocation(), diag::note_previous_definition); 4839 Invalid = true; 4840 } 4841 } 4842 } 4843 4844 // Merge any previous default template arguments into our parameters, 4845 // and check the parameter list. 4846 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 4847 TPC_TypeAliasTemplate)) 4848 return 0; 4849 4850 TypeAliasTemplateDecl *NewDecl = 4851 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 4852 Name.Identifier, TemplateParams, 4853 NewTD); 4854 4855 NewDecl->setAccess(AS); 4856 4857 if (Invalid) 4858 NewDecl->setInvalidDecl(); 4859 else if (OldDecl) 4860 NewDecl->setPreviousDeclaration(OldDecl); 4861 4862 NewND = NewDecl; 4863 } else { 4864 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 4865 NewND = NewTD; 4866 } 4867 4868 if (!Redeclaration) 4869 PushOnScopeChains(NewND, S); 4870 4871 return NewND; 4872} 4873 4874Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4875 SourceLocation NamespaceLoc, 4876 SourceLocation AliasLoc, 4877 IdentifierInfo *Alias, 4878 CXXScopeSpec &SS, 4879 SourceLocation IdentLoc, 4880 IdentifierInfo *Ident) { 4881 4882 // Lookup the namespace name. 4883 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4884 LookupParsedName(R, S, &SS); 4885 4886 // Check if we have a previous declaration with the same name. 4887 NamedDecl *PrevDecl 4888 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4889 ForRedeclaration); 4890 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4891 PrevDecl = 0; 4892 4893 if (PrevDecl) { 4894 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4895 // We already have an alias with the same name that points to the same 4896 // namespace, so don't create a new one. 4897 // FIXME: At some point, we'll want to create the (redundant) 4898 // declaration to maintain better source information. 4899 if (!R.isAmbiguous() && !R.empty() && 4900 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4901 return 0; 4902 } 4903 4904 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4905 diag::err_redefinition_different_kind; 4906 Diag(AliasLoc, DiagID) << Alias; 4907 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4908 return 0; 4909 } 4910 4911 if (R.isAmbiguous()) 4912 return 0; 4913 4914 if (R.empty()) { 4915 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4916 CTC_NoKeywords, 0)) { 4917 if (R.getAsSingle<NamespaceDecl>() || 4918 R.getAsSingle<NamespaceAliasDecl>()) { 4919 if (DeclContext *DC = computeDeclContext(SS, false)) 4920 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4921 << Ident << DC << Corrected << SS.getRange() 4922 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4923 else 4924 Diag(IdentLoc, diag::err_using_directive_suggest) 4925 << Ident << Corrected 4926 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4927 4928 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4929 << Corrected; 4930 4931 Ident = Corrected.getAsIdentifierInfo(); 4932 } else { 4933 R.clear(); 4934 R.setLookupName(Ident); 4935 } 4936 } 4937 4938 if (R.empty()) { 4939 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4940 return 0; 4941 } 4942 } 4943 4944 NamespaceAliasDecl *AliasDecl = 4945 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4946 Alias, SS.getWithLocInContext(Context), 4947 IdentLoc, R.getFoundDecl()); 4948 4949 PushOnScopeChains(AliasDecl, S); 4950 return AliasDecl; 4951} 4952 4953namespace { 4954 /// \brief Scoped object used to handle the state changes required in Sema 4955 /// to implicitly define the body of a C++ member function; 4956 class ImplicitlyDefinedFunctionScope { 4957 Sema &S; 4958 Sema::ContextRAII SavedContext; 4959 4960 public: 4961 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4962 : S(S), SavedContext(S, Method) 4963 { 4964 S.PushFunctionScope(); 4965 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4966 } 4967 4968 ~ImplicitlyDefinedFunctionScope() { 4969 S.PopExpressionEvaluationContext(); 4970 S.PopFunctionOrBlockScope(); 4971 } 4972 }; 4973} 4974 4975static CXXConstructorDecl *getDefaultConstructorUnsafe(Sema &Self, 4976 CXXRecordDecl *D) { 4977 ASTContext &Context = Self.Context; 4978 QualType ClassType = Context.getTypeDeclType(D); 4979 DeclarationName ConstructorName 4980 = Context.DeclarationNames.getCXXConstructorName( 4981 Context.getCanonicalType(ClassType.getUnqualifiedType())); 4982 4983 DeclContext::lookup_const_iterator Con, ConEnd; 4984 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 4985 Con != ConEnd; ++Con) { 4986 // FIXME: In C++0x, a constructor template can be a default constructor. 4987 if (isa<FunctionTemplateDecl>(*Con)) 4988 continue; 4989 4990 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 4991 if (Constructor->isDefaultConstructor()) 4992 return Constructor; 4993 } 4994 return 0; 4995} 4996 4997Sema::ImplicitExceptionSpecification 4998Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 4999 // C++ [except.spec]p14: 5000 // An implicitly declared special member function (Clause 12) shall have an 5001 // exception-specification. [...] 5002 ImplicitExceptionSpecification ExceptSpec(Context); 5003 5004 // Direct base-class constructors. 5005 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5006 BEnd = ClassDecl->bases_end(); 5007 B != BEnd; ++B) { 5008 if (B->isVirtual()) // Handled below. 5009 continue; 5010 5011 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5012 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5013 if (!BaseClassDecl->needsImplicitDefaultConstructor()) 5014 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5015 else if (CXXConstructorDecl *Constructor 5016 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5017 ExceptSpec.CalledDecl(Constructor); 5018 } 5019 } 5020 5021 // Virtual base-class constructors. 5022 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5023 BEnd = ClassDecl->vbases_end(); 5024 B != BEnd; ++B) { 5025 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5026 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5027 if (!BaseClassDecl->needsImplicitDefaultConstructor()) 5028 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 5029 else if (CXXConstructorDecl *Constructor 5030 = getDefaultConstructorUnsafe(*this, BaseClassDecl)) 5031 ExceptSpec.CalledDecl(Constructor); 5032 } 5033 } 5034 5035 // Field constructors. 5036 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5037 FEnd = ClassDecl->field_end(); 5038 F != FEnd; ++F) { 5039 if (const RecordType *RecordTy 5040 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5041 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5042 if (!FieldClassDecl->needsImplicitDefaultConstructor()) 5043 ExceptSpec.CalledDecl( 5044 DeclareImplicitDefaultConstructor(FieldClassDecl)); 5045 else if (CXXConstructorDecl *Constructor 5046 = getDefaultConstructorUnsafe(*this, FieldClassDecl)) 5047 ExceptSpec.CalledDecl(Constructor); 5048 } 5049 } 5050 5051 return ExceptSpec; 5052} 5053 5054CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5055 CXXRecordDecl *ClassDecl) { 5056 // C++ [class.ctor]p5: 5057 // A default constructor for a class X is a constructor of class X 5058 // that can be called without an argument. If there is no 5059 // user-declared constructor for class X, a default constructor is 5060 // implicitly declared. An implicitly-declared default constructor 5061 // is an inline public member of its class. 5062 assert(!ClassDecl->hasUserDeclaredConstructor() && 5063 "Should not build implicit default constructor!"); 5064 5065 ImplicitExceptionSpecification Spec = 5066 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5067 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5068 5069 // Create the actual constructor declaration. 5070 CanQualType ClassType 5071 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5072 SourceLocation ClassLoc = ClassDecl->getLocation(); 5073 DeclarationName Name 5074 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5075 DeclarationNameInfo NameInfo(Name, ClassLoc); 5076 CXXConstructorDecl *DefaultCon 5077 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5078 Context.getFunctionType(Context.VoidTy, 5079 0, 0, EPI), 5080 /*TInfo=*/0, 5081 /*isExplicit=*/false, 5082 /*isInline=*/true, 5083 /*isImplicitlyDeclared=*/true); 5084 DefaultCon->setAccess(AS_public); 5085 DefaultCon->setImplicit(); 5086 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5087 5088 // Note that we have declared this constructor. 5089 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5090 5091 if (Scope *S = getScopeForContext(ClassDecl)) 5092 PushOnScopeChains(DefaultCon, S, false); 5093 ClassDecl->addDecl(DefaultCon); 5094 5095 return DefaultCon; 5096} 5097 5098void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5099 CXXConstructorDecl *Constructor) { 5100 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 5101 !Constructor->isUsed(false)) && 5102 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 5103 5104 CXXRecordDecl *ClassDecl = Constructor->getParent(); 5105 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 5106 5107 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 5108 DiagnosticErrorTrap Trap(Diags); 5109 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 5110 Trap.hasErrorOccurred()) { 5111 Diag(CurrentLocation, diag::note_member_synthesized_at) 5112 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 5113 Constructor->setInvalidDecl(); 5114 return; 5115 } 5116 5117 SourceLocation Loc = Constructor->getLocation(); 5118 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5119 5120 Constructor->setUsed(); 5121 MarkVTableUsed(CurrentLocation, ClassDecl); 5122 5123 if (ASTMutationListener *L = getASTMutationListener()) { 5124 L->CompletedImplicitDefinition(Constructor); 5125 } 5126} 5127 5128void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 5129 // We start with an initial pass over the base classes to collect those that 5130 // inherit constructors from. If there are none, we can forgo all further 5131 // processing. 5132 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 5133 BasesVector BasesToInheritFrom; 5134 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 5135 BaseE = ClassDecl->bases_end(); 5136 BaseIt != BaseE; ++BaseIt) { 5137 if (BaseIt->getInheritConstructors()) { 5138 QualType Base = BaseIt->getType(); 5139 if (Base->isDependentType()) { 5140 // If we inherit constructors from anything that is dependent, just 5141 // abort processing altogether. We'll get another chance for the 5142 // instantiations. 5143 return; 5144 } 5145 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 5146 } 5147 } 5148 if (BasesToInheritFrom.empty()) 5149 return; 5150 5151 // Now collect the constructors that we already have in the current class. 5152 // Those take precedence over inherited constructors. 5153 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 5154 // unless there is a user-declared constructor with the same signature in 5155 // the class where the using-declaration appears. 5156 llvm::SmallSet<const Type *, 8> ExistingConstructors; 5157 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 5158 CtorE = ClassDecl->ctor_end(); 5159 CtorIt != CtorE; ++CtorIt) { 5160 ExistingConstructors.insert( 5161 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 5162 } 5163 5164 Scope *S = getScopeForContext(ClassDecl); 5165 DeclarationName CreatedCtorName = 5166 Context.DeclarationNames.getCXXConstructorName( 5167 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 5168 5169 // Now comes the true work. 5170 // First, we keep a map from constructor types to the base that introduced 5171 // them. Needed for finding conflicting constructors. We also keep the 5172 // actually inserted declarations in there, for pretty diagnostics. 5173 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 5174 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 5175 ConstructorToSourceMap InheritedConstructors; 5176 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 5177 BaseE = BasesToInheritFrom.end(); 5178 BaseIt != BaseE; ++BaseIt) { 5179 const RecordType *Base = *BaseIt; 5180 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 5181 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 5182 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 5183 CtorE = BaseDecl->ctor_end(); 5184 CtorIt != CtorE; ++CtorIt) { 5185 // Find the using declaration for inheriting this base's constructors. 5186 DeclarationName Name = 5187 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 5188 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 5189 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 5190 SourceLocation UsingLoc = UD ? UD->getLocation() : 5191 ClassDecl->getLocation(); 5192 5193 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 5194 // from the class X named in the using-declaration consists of actual 5195 // constructors and notional constructors that result from the 5196 // transformation of defaulted parameters as follows: 5197 // - all non-template default constructors of X, and 5198 // - for each non-template constructor of X that has at least one 5199 // parameter with a default argument, the set of constructors that 5200 // results from omitting any ellipsis parameter specification and 5201 // successively omitting parameters with a default argument from the 5202 // end of the parameter-type-list. 5203 CXXConstructorDecl *BaseCtor = *CtorIt; 5204 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 5205 const FunctionProtoType *BaseCtorType = 5206 BaseCtor->getType()->getAs<FunctionProtoType>(); 5207 5208 for (unsigned params = BaseCtor->getMinRequiredArguments(), 5209 maxParams = BaseCtor->getNumParams(); 5210 params <= maxParams; ++params) { 5211 // Skip default constructors. They're never inherited. 5212 if (params == 0) 5213 continue; 5214 // Skip copy and move constructors for the same reason. 5215 if (CanBeCopyOrMove && params == 1) 5216 continue; 5217 5218 // Build up a function type for this particular constructor. 5219 // FIXME: The working paper does not consider that the exception spec 5220 // for the inheriting constructor might be larger than that of the 5221 // source. This code doesn't yet, either. 5222 const Type *NewCtorType; 5223 if (params == maxParams) 5224 NewCtorType = BaseCtorType; 5225 else { 5226 llvm::SmallVector<QualType, 16> Args; 5227 for (unsigned i = 0; i < params; ++i) { 5228 Args.push_back(BaseCtorType->getArgType(i)); 5229 } 5230 FunctionProtoType::ExtProtoInfo ExtInfo = 5231 BaseCtorType->getExtProtoInfo(); 5232 ExtInfo.Variadic = false; 5233 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 5234 Args.data(), params, ExtInfo) 5235 .getTypePtr(); 5236 } 5237 const Type *CanonicalNewCtorType = 5238 Context.getCanonicalType(NewCtorType); 5239 5240 // Now that we have the type, first check if the class already has a 5241 // constructor with this signature. 5242 if (ExistingConstructors.count(CanonicalNewCtorType)) 5243 continue; 5244 5245 // Then we check if we have already declared an inherited constructor 5246 // with this signature. 5247 std::pair<ConstructorToSourceMap::iterator, bool> result = 5248 InheritedConstructors.insert(std::make_pair( 5249 CanonicalNewCtorType, 5250 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 5251 if (!result.second) { 5252 // Already in the map. If it came from a different class, that's an 5253 // error. Not if it's from the same. 5254 CanQualType PreviousBase = result.first->second.first; 5255 if (CanonicalBase != PreviousBase) { 5256 const CXXConstructorDecl *PrevCtor = result.first->second.second; 5257 const CXXConstructorDecl *PrevBaseCtor = 5258 PrevCtor->getInheritedConstructor(); 5259 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 5260 5261 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 5262 Diag(BaseCtor->getLocation(), 5263 diag::note_using_decl_constructor_conflict_current_ctor); 5264 Diag(PrevBaseCtor->getLocation(), 5265 diag::note_using_decl_constructor_conflict_previous_ctor); 5266 Diag(PrevCtor->getLocation(), 5267 diag::note_using_decl_constructor_conflict_previous_using); 5268 } 5269 continue; 5270 } 5271 5272 // OK, we're there, now add the constructor. 5273 // C++0x [class.inhctor]p8: [...] that would be performed by a 5274 // user-writtern inline constructor [...] 5275 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 5276 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 5277 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 5278 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 5279 /*ImplicitlyDeclared=*/true); 5280 NewCtor->setAccess(BaseCtor->getAccess()); 5281 5282 // Build up the parameter decls and add them. 5283 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 5284 for (unsigned i = 0; i < params; ++i) { 5285 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 5286 UsingLoc, UsingLoc, 5287 /*IdentifierInfo=*/0, 5288 BaseCtorType->getArgType(i), 5289 /*TInfo=*/0, SC_None, 5290 SC_None, /*DefaultArg=*/0)); 5291 } 5292 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 5293 NewCtor->setInheritedConstructor(BaseCtor); 5294 5295 PushOnScopeChains(NewCtor, S, false); 5296 ClassDecl->addDecl(NewCtor); 5297 result.first->second.second = NewCtor; 5298 } 5299 } 5300 } 5301} 5302 5303CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 5304 // C++ [class.dtor]p2: 5305 // If a class has no user-declared destructor, a destructor is 5306 // declared implicitly. An implicitly-declared destructor is an 5307 // inline public member of its class. 5308 5309 // C++ [except.spec]p14: 5310 // An implicitly declared special member function (Clause 12) shall have 5311 // an exception-specification. 5312 ImplicitExceptionSpecification ExceptSpec(Context); 5313 5314 // Direct base-class destructors. 5315 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5316 BEnd = ClassDecl->bases_end(); 5317 B != BEnd; ++B) { 5318 if (B->isVirtual()) // Handled below. 5319 continue; 5320 5321 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5322 ExceptSpec.CalledDecl( 5323 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5324 } 5325 5326 // Virtual base-class destructors. 5327 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5328 BEnd = ClassDecl->vbases_end(); 5329 B != BEnd; ++B) { 5330 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 5331 ExceptSpec.CalledDecl( 5332 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 5333 } 5334 5335 // Field destructors. 5336 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5337 FEnd = ClassDecl->field_end(); 5338 F != FEnd; ++F) { 5339 if (const RecordType *RecordTy 5340 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 5341 ExceptSpec.CalledDecl( 5342 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 5343 } 5344 5345 // Create the actual destructor declaration. 5346 FunctionProtoType::ExtProtoInfo EPI; 5347 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5348 EPI.NumExceptions = ExceptSpec.size(); 5349 EPI.Exceptions = ExceptSpec.data(); 5350 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5351 5352 CanQualType ClassType 5353 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5354 SourceLocation ClassLoc = ClassDecl->getLocation(); 5355 DeclarationName Name 5356 = Context.DeclarationNames.getCXXDestructorName(ClassType); 5357 DeclarationNameInfo NameInfo(Name, ClassLoc); 5358 CXXDestructorDecl *Destructor 5359 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 5360 /*isInline=*/true, 5361 /*isImplicitlyDeclared=*/true); 5362 Destructor->setAccess(AS_public); 5363 Destructor->setImplicit(); 5364 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 5365 5366 // Note that we have declared this destructor. 5367 ++ASTContext::NumImplicitDestructorsDeclared; 5368 5369 // Introduce this destructor into its scope. 5370 if (Scope *S = getScopeForContext(ClassDecl)) 5371 PushOnScopeChains(Destructor, S, false); 5372 ClassDecl->addDecl(Destructor); 5373 5374 // This could be uniqued if it ever proves significant. 5375 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 5376 5377 AddOverriddenMethods(ClassDecl, Destructor); 5378 5379 return Destructor; 5380} 5381 5382void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 5383 CXXDestructorDecl *Destructor) { 5384 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 5385 "DefineImplicitDestructor - call it for implicit default dtor"); 5386 CXXRecordDecl *ClassDecl = Destructor->getParent(); 5387 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 5388 5389 if (Destructor->isInvalidDecl()) 5390 return; 5391 5392 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 5393 5394 DiagnosticErrorTrap Trap(Diags); 5395 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5396 Destructor->getParent()); 5397 5398 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 5399 Diag(CurrentLocation, diag::note_member_synthesized_at) 5400 << CXXDestructor << Context.getTagDeclType(ClassDecl); 5401 5402 Destructor->setInvalidDecl(); 5403 return; 5404 } 5405 5406 SourceLocation Loc = Destructor->getLocation(); 5407 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 5408 5409 Destructor->setUsed(); 5410 MarkVTableUsed(CurrentLocation, ClassDecl); 5411 5412 if (ASTMutationListener *L = getASTMutationListener()) { 5413 L->CompletedImplicitDefinition(Destructor); 5414 } 5415} 5416 5417/// \brief Builds a statement that copies the given entity from \p From to 5418/// \c To. 5419/// 5420/// This routine is used to copy the members of a class with an 5421/// implicitly-declared copy assignment operator. When the entities being 5422/// copied are arrays, this routine builds for loops to copy them. 5423/// 5424/// \param S The Sema object used for type-checking. 5425/// 5426/// \param Loc The location where the implicit copy is being generated. 5427/// 5428/// \param T The type of the expressions being copied. Both expressions must 5429/// have this type. 5430/// 5431/// \param To The expression we are copying to. 5432/// 5433/// \param From The expression we are copying from. 5434/// 5435/// \param CopyingBaseSubobject Whether we're copying a base subobject. 5436/// Otherwise, it's a non-static member subobject. 5437/// 5438/// \param Depth Internal parameter recording the depth of the recursion. 5439/// 5440/// \returns A statement or a loop that copies the expressions. 5441static StmtResult 5442BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 5443 Expr *To, Expr *From, 5444 bool CopyingBaseSubobject, unsigned Depth = 0) { 5445 // C++0x [class.copy]p30: 5446 // Each subobject is assigned in the manner appropriate to its type: 5447 // 5448 // - if the subobject is of class type, the copy assignment operator 5449 // for the class is used (as if by explicit qualification; that is, 5450 // ignoring any possible virtual overriding functions in more derived 5451 // classes); 5452 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 5453 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5454 5455 // Look for operator=. 5456 DeclarationName Name 5457 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5458 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 5459 S.LookupQualifiedName(OpLookup, ClassDecl, false); 5460 5461 // Filter out any result that isn't a copy-assignment operator. 5462 LookupResult::Filter F = OpLookup.makeFilter(); 5463 while (F.hasNext()) { 5464 NamedDecl *D = F.next(); 5465 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 5466 if (Method->isCopyAssignmentOperator()) 5467 continue; 5468 5469 F.erase(); 5470 } 5471 F.done(); 5472 5473 // Suppress the protected check (C++ [class.protected]) for each of the 5474 // assignment operators we found. This strange dance is required when 5475 // we're assigning via a base classes's copy-assignment operator. To 5476 // ensure that we're getting the right base class subobject (without 5477 // ambiguities), we need to cast "this" to that subobject type; to 5478 // ensure that we don't go through the virtual call mechanism, we need 5479 // to qualify the operator= name with the base class (see below). However, 5480 // this means that if the base class has a protected copy assignment 5481 // operator, the protected member access check will fail. So, we 5482 // rewrite "protected" access to "public" access in this case, since we 5483 // know by construction that we're calling from a derived class. 5484 if (CopyingBaseSubobject) { 5485 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 5486 L != LEnd; ++L) { 5487 if (L.getAccess() == AS_protected) 5488 L.setAccess(AS_public); 5489 } 5490 } 5491 5492 // Create the nested-name-specifier that will be used to qualify the 5493 // reference to operator=; this is required to suppress the virtual 5494 // call mechanism. 5495 CXXScopeSpec SS; 5496 SS.MakeTrivial(S.Context, 5497 NestedNameSpecifier::Create(S.Context, 0, false, 5498 T.getTypePtr()), 5499 Loc); 5500 5501 // Create the reference to operator=. 5502 ExprResult OpEqualRef 5503 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 5504 /*FirstQualifierInScope=*/0, OpLookup, 5505 /*TemplateArgs=*/0, 5506 /*SuppressQualifierCheck=*/true); 5507 if (OpEqualRef.isInvalid()) 5508 return StmtError(); 5509 5510 // Build the call to the assignment operator. 5511 5512 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 5513 OpEqualRef.takeAs<Expr>(), 5514 Loc, &From, 1, Loc); 5515 if (Call.isInvalid()) 5516 return StmtError(); 5517 5518 return S.Owned(Call.takeAs<Stmt>()); 5519 } 5520 5521 // - if the subobject is of scalar type, the built-in assignment 5522 // operator is used. 5523 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 5524 if (!ArrayTy) { 5525 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 5526 if (Assignment.isInvalid()) 5527 return StmtError(); 5528 5529 return S.Owned(Assignment.takeAs<Stmt>()); 5530 } 5531 5532 // - if the subobject is an array, each element is assigned, in the 5533 // manner appropriate to the element type; 5534 5535 // Construct a loop over the array bounds, e.g., 5536 // 5537 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 5538 // 5539 // that will copy each of the array elements. 5540 QualType SizeType = S.Context.getSizeType(); 5541 5542 // Create the iteration variable. 5543 IdentifierInfo *IterationVarName = 0; 5544 { 5545 llvm::SmallString<8> Str; 5546 llvm::raw_svector_ostream OS(Str); 5547 OS << "__i" << Depth; 5548 IterationVarName = &S.Context.Idents.get(OS.str()); 5549 } 5550 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 5551 IterationVarName, SizeType, 5552 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 5553 SC_None, SC_None); 5554 5555 // Initialize the iteration variable to zero. 5556 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 5557 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 5558 5559 // Create a reference to the iteration variable; we'll use this several 5560 // times throughout. 5561 Expr *IterationVarRef 5562 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 5563 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 5564 5565 // Create the DeclStmt that holds the iteration variable. 5566 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 5567 5568 // Create the comparison against the array bound. 5569 llvm::APInt Upper 5570 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 5571 Expr *Comparison 5572 = new (S.Context) BinaryOperator(IterationVarRef, 5573 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 5574 BO_NE, S.Context.BoolTy, 5575 VK_RValue, OK_Ordinary, Loc); 5576 5577 // Create the pre-increment of the iteration variable. 5578 Expr *Increment 5579 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 5580 VK_LValue, OK_Ordinary, Loc); 5581 5582 // Subscript the "from" and "to" expressions with the iteration variable. 5583 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 5584 IterationVarRef, Loc)); 5585 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 5586 IterationVarRef, Loc)); 5587 5588 // Build the copy for an individual element of the array. 5589 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 5590 To, From, CopyingBaseSubobject, 5591 Depth + 1); 5592 if (Copy.isInvalid()) 5593 return StmtError(); 5594 5595 // Construct the loop that copies all elements of this array. 5596 return S.ActOnForStmt(Loc, Loc, InitStmt, 5597 S.MakeFullExpr(Comparison), 5598 0, S.MakeFullExpr(Increment), 5599 Loc, Copy.take()); 5600} 5601 5602/// \brief Determine whether the given class has a copy assignment operator 5603/// that accepts a const-qualified argument. 5604static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 5605 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 5606 5607 if (!Class->hasDeclaredCopyAssignment()) 5608 S.DeclareImplicitCopyAssignment(Class); 5609 5610 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 5611 DeclarationName OpName 5612 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5613 5614 DeclContext::lookup_const_iterator Op, OpEnd; 5615 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 5616 // C++ [class.copy]p9: 5617 // A user-declared copy assignment operator is a non-static non-template 5618 // member function of class X with exactly one parameter of type X, X&, 5619 // const X&, volatile X& or const volatile X&. 5620 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 5621 if (!Method) 5622 continue; 5623 5624 if (Method->isStatic()) 5625 continue; 5626 if (Method->getPrimaryTemplate()) 5627 continue; 5628 const FunctionProtoType *FnType = 5629 Method->getType()->getAs<FunctionProtoType>(); 5630 assert(FnType && "Overloaded operator has no prototype."); 5631 // Don't assert on this; an invalid decl might have been left in the AST. 5632 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 5633 continue; 5634 bool AcceptsConst = true; 5635 QualType ArgType = FnType->getArgType(0); 5636 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 5637 ArgType = Ref->getPointeeType(); 5638 // Is it a non-const lvalue reference? 5639 if (!ArgType.isConstQualified()) 5640 AcceptsConst = false; 5641 } 5642 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 5643 continue; 5644 5645 // We have a single argument of type cv X or cv X&, i.e. we've found the 5646 // copy assignment operator. Return whether it accepts const arguments. 5647 return AcceptsConst; 5648 } 5649 assert(Class->isInvalidDecl() && 5650 "No copy assignment operator declared in valid code."); 5651 return false; 5652} 5653 5654CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 5655 // Note: The following rules are largely analoguous to the copy 5656 // constructor rules. Note that virtual bases are not taken into account 5657 // for determining the argument type of the operator. Note also that 5658 // operators taking an object instead of a reference are allowed. 5659 5660 5661 // C++ [class.copy]p10: 5662 // If the class definition does not explicitly declare a copy 5663 // assignment operator, one is declared implicitly. 5664 // The implicitly-defined copy assignment operator for a class X 5665 // will have the form 5666 // 5667 // X& X::operator=(const X&) 5668 // 5669 // if 5670 bool HasConstCopyAssignment = true; 5671 5672 // -- each direct base class B of X has a copy assignment operator 5673 // whose parameter is of type const B&, const volatile B& or B, 5674 // and 5675 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5676 BaseEnd = ClassDecl->bases_end(); 5677 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 5678 assert(!Base->getType()->isDependentType() && 5679 "Cannot generate implicit members for class with dependent bases."); 5680 const CXXRecordDecl *BaseClassDecl 5681 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5682 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 5683 } 5684 5685 // -- for all the nonstatic data members of X that are of a class 5686 // type M (or array thereof), each such class type has a copy 5687 // assignment operator whose parameter is of type const M&, 5688 // const volatile M& or M. 5689 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5690 FieldEnd = ClassDecl->field_end(); 5691 HasConstCopyAssignment && Field != FieldEnd; 5692 ++Field) { 5693 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5694 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5695 const CXXRecordDecl *FieldClassDecl 5696 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5697 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 5698 } 5699 } 5700 5701 // Otherwise, the implicitly declared copy assignment operator will 5702 // have the form 5703 // 5704 // X& X::operator=(X&) 5705 QualType ArgType = Context.getTypeDeclType(ClassDecl); 5706 QualType RetType = Context.getLValueReferenceType(ArgType); 5707 if (HasConstCopyAssignment) 5708 ArgType = ArgType.withConst(); 5709 ArgType = Context.getLValueReferenceType(ArgType); 5710 5711 // C++ [except.spec]p14: 5712 // An implicitly declared special member function (Clause 12) shall have an 5713 // exception-specification. [...] 5714 ImplicitExceptionSpecification ExceptSpec(Context); 5715 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5716 BaseEnd = ClassDecl->bases_end(); 5717 Base != BaseEnd; ++Base) { 5718 CXXRecordDecl *BaseClassDecl 5719 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5720 5721 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 5722 DeclareImplicitCopyAssignment(BaseClassDecl); 5723 5724 if (CXXMethodDecl *CopyAssign 5725 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5726 ExceptSpec.CalledDecl(CopyAssign); 5727 } 5728 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5729 FieldEnd = ClassDecl->field_end(); 5730 Field != FieldEnd; 5731 ++Field) { 5732 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5733 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5734 CXXRecordDecl *FieldClassDecl 5735 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5736 5737 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 5738 DeclareImplicitCopyAssignment(FieldClassDecl); 5739 5740 if (CXXMethodDecl *CopyAssign 5741 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 5742 ExceptSpec.CalledDecl(CopyAssign); 5743 } 5744 } 5745 5746 // An implicitly-declared copy assignment operator is an inline public 5747 // member of its class. 5748 FunctionProtoType::ExtProtoInfo EPI; 5749 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 5750 EPI.NumExceptions = ExceptSpec.size(); 5751 EPI.Exceptions = ExceptSpec.data(); 5752 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 5753 SourceLocation ClassLoc = ClassDecl->getLocation(); 5754 DeclarationNameInfo NameInfo(Name, ClassLoc); 5755 CXXMethodDecl *CopyAssignment 5756 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5757 Context.getFunctionType(RetType, &ArgType, 1, EPI), 5758 /*TInfo=*/0, /*isStatic=*/false, 5759 /*StorageClassAsWritten=*/SC_None, 5760 /*isInline=*/true, 5761 SourceLocation()); 5762 CopyAssignment->setAccess(AS_public); 5763 CopyAssignment->setImplicit(); 5764 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 5765 5766 // Add the parameter to the operator. 5767 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 5768 ClassLoc, ClassLoc, /*Id=*/0, 5769 ArgType, /*TInfo=*/0, 5770 SC_None, 5771 SC_None, 0); 5772 CopyAssignment->setParams(&FromParam, 1); 5773 5774 // Note that we have added this copy-assignment operator. 5775 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 5776 5777 if (Scope *S = getScopeForContext(ClassDecl)) 5778 PushOnScopeChains(CopyAssignment, S, false); 5779 ClassDecl->addDecl(CopyAssignment); 5780 5781 AddOverriddenMethods(ClassDecl, CopyAssignment); 5782 return CopyAssignment; 5783} 5784 5785void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 5786 CXXMethodDecl *CopyAssignOperator) { 5787 assert((CopyAssignOperator->isImplicit() && 5788 CopyAssignOperator->isOverloadedOperator() && 5789 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 5790 !CopyAssignOperator->isUsed(false)) && 5791 "DefineImplicitCopyAssignment called for wrong function"); 5792 5793 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 5794 5795 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 5796 CopyAssignOperator->setInvalidDecl(); 5797 return; 5798 } 5799 5800 CopyAssignOperator->setUsed(); 5801 5802 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 5803 DiagnosticErrorTrap Trap(Diags); 5804 5805 // C++0x [class.copy]p30: 5806 // The implicitly-defined or explicitly-defaulted copy assignment operator 5807 // for a non-union class X performs memberwise copy assignment of its 5808 // subobjects. The direct base classes of X are assigned first, in the 5809 // order of their declaration in the base-specifier-list, and then the 5810 // immediate non-static data members of X are assigned, in the order in 5811 // which they were declared in the class definition. 5812 5813 // The statements that form the synthesized function body. 5814 ASTOwningVector<Stmt*> Statements(*this); 5815 5816 // The parameter for the "other" object, which we are copying from. 5817 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 5818 Qualifiers OtherQuals = Other->getType().getQualifiers(); 5819 QualType OtherRefType = Other->getType(); 5820 if (const LValueReferenceType *OtherRef 5821 = OtherRefType->getAs<LValueReferenceType>()) { 5822 OtherRefType = OtherRef->getPointeeType(); 5823 OtherQuals = OtherRefType.getQualifiers(); 5824 } 5825 5826 // Our location for everything implicitly-generated. 5827 SourceLocation Loc = CopyAssignOperator->getLocation(); 5828 5829 // Construct a reference to the "other" object. We'll be using this 5830 // throughout the generated ASTs. 5831 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 5832 assert(OtherRef && "Reference to parameter cannot fail!"); 5833 5834 // Construct the "this" pointer. We'll be using this throughout the generated 5835 // ASTs. 5836 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 5837 assert(This && "Reference to this cannot fail!"); 5838 5839 // Assign base classes. 5840 bool Invalid = false; 5841 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5842 E = ClassDecl->bases_end(); Base != E; ++Base) { 5843 // Form the assignment: 5844 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 5845 QualType BaseType = Base->getType().getUnqualifiedType(); 5846 if (!BaseType->isRecordType()) { 5847 Invalid = true; 5848 continue; 5849 } 5850 5851 CXXCastPath BasePath; 5852 BasePath.push_back(Base); 5853 5854 // Construct the "from" expression, which is an implicit cast to the 5855 // appropriately-qualified base type. 5856 Expr *From = OtherRef; 5857 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5858 CK_UncheckedDerivedToBase, 5859 VK_LValue, &BasePath).take(); 5860 5861 // Dereference "this". 5862 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5863 5864 // Implicitly cast "this" to the appropriately-qualified base type. 5865 To = ImpCastExprToType(To.take(), 5866 Context.getCVRQualifiedType(BaseType, 5867 CopyAssignOperator->getTypeQualifiers()), 5868 CK_UncheckedDerivedToBase, 5869 VK_LValue, &BasePath); 5870 5871 // Build the copy. 5872 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5873 To.get(), From, 5874 /*CopyingBaseSubobject=*/true); 5875 if (Copy.isInvalid()) { 5876 Diag(CurrentLocation, diag::note_member_synthesized_at) 5877 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5878 CopyAssignOperator->setInvalidDecl(); 5879 return; 5880 } 5881 5882 // Success! Record the copy. 5883 Statements.push_back(Copy.takeAs<Expr>()); 5884 } 5885 5886 // \brief Reference to the __builtin_memcpy function. 5887 Expr *BuiltinMemCpyRef = 0; 5888 // \brief Reference to the __builtin_objc_memmove_collectable function. 5889 Expr *CollectableMemCpyRef = 0; 5890 5891 // Assign non-static members. 5892 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5893 FieldEnd = ClassDecl->field_end(); 5894 Field != FieldEnd; ++Field) { 5895 // Check for members of reference type; we can't copy those. 5896 if (Field->getType()->isReferenceType()) { 5897 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5898 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5899 Diag(Field->getLocation(), diag::note_declared_at); 5900 Diag(CurrentLocation, diag::note_member_synthesized_at) 5901 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5902 Invalid = true; 5903 continue; 5904 } 5905 5906 // Check for members of const-qualified, non-class type. 5907 QualType BaseType = Context.getBaseElementType(Field->getType()); 5908 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5909 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5910 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5911 Diag(Field->getLocation(), diag::note_declared_at); 5912 Diag(CurrentLocation, diag::note_member_synthesized_at) 5913 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5914 Invalid = true; 5915 continue; 5916 } 5917 5918 QualType FieldType = Field->getType().getNonReferenceType(); 5919 if (FieldType->isIncompleteArrayType()) { 5920 assert(ClassDecl->hasFlexibleArrayMember() && 5921 "Incomplete array type is not valid"); 5922 continue; 5923 } 5924 5925 // Build references to the field in the object we're copying from and to. 5926 CXXScopeSpec SS; // Intentionally empty 5927 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5928 LookupMemberName); 5929 MemberLookup.addDecl(*Field); 5930 MemberLookup.resolveKind(); 5931 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5932 Loc, /*IsArrow=*/false, 5933 SS, 0, MemberLookup, 0); 5934 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5935 Loc, /*IsArrow=*/true, 5936 SS, 0, MemberLookup, 0); 5937 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5938 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5939 5940 // If the field should be copied with __builtin_memcpy rather than via 5941 // explicit assignments, do so. This optimization only applies for arrays 5942 // of scalars and arrays of class type with trivial copy-assignment 5943 // operators. 5944 if (FieldType->isArrayType() && 5945 (!BaseType->isRecordType() || 5946 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5947 ->hasTrivialCopyAssignment())) { 5948 // Compute the size of the memory buffer to be copied. 5949 QualType SizeType = Context.getSizeType(); 5950 llvm::APInt Size(Context.getTypeSize(SizeType), 5951 Context.getTypeSizeInChars(BaseType).getQuantity()); 5952 for (const ConstantArrayType *Array 5953 = Context.getAsConstantArrayType(FieldType); 5954 Array; 5955 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5956 llvm::APInt ArraySize 5957 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 5958 Size *= ArraySize; 5959 } 5960 5961 // Take the address of the field references for "from" and "to". 5962 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5963 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5964 5965 bool NeedsCollectableMemCpy = 5966 (BaseType->isRecordType() && 5967 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5968 5969 if (NeedsCollectableMemCpy) { 5970 if (!CollectableMemCpyRef) { 5971 // Create a reference to the __builtin_objc_memmove_collectable function. 5972 LookupResult R(*this, 5973 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5974 Loc, LookupOrdinaryName); 5975 LookupName(R, TUScope, true); 5976 5977 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5978 if (!CollectableMemCpy) { 5979 // Something went horribly wrong earlier, and we will have 5980 // complained about it. 5981 Invalid = true; 5982 continue; 5983 } 5984 5985 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5986 CollectableMemCpy->getType(), 5987 VK_LValue, Loc, 0).take(); 5988 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5989 } 5990 } 5991 // Create a reference to the __builtin_memcpy builtin function. 5992 else if (!BuiltinMemCpyRef) { 5993 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5994 LookupOrdinaryName); 5995 LookupName(R, TUScope, true); 5996 5997 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5998 if (!BuiltinMemCpy) { 5999 // Something went horribly wrong earlier, and we will have complained 6000 // about it. 6001 Invalid = true; 6002 continue; 6003 } 6004 6005 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6006 BuiltinMemCpy->getType(), 6007 VK_LValue, Loc, 0).take(); 6008 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 6009 } 6010 6011 ASTOwningVector<Expr*> CallArgs(*this); 6012 CallArgs.push_back(To.takeAs<Expr>()); 6013 CallArgs.push_back(From.takeAs<Expr>()); 6014 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 6015 ExprResult Call = ExprError(); 6016 if (NeedsCollectableMemCpy) 6017 Call = ActOnCallExpr(/*Scope=*/0, 6018 CollectableMemCpyRef, 6019 Loc, move_arg(CallArgs), 6020 Loc); 6021 else 6022 Call = ActOnCallExpr(/*Scope=*/0, 6023 BuiltinMemCpyRef, 6024 Loc, move_arg(CallArgs), 6025 Loc); 6026 6027 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 6028 Statements.push_back(Call.takeAs<Expr>()); 6029 continue; 6030 } 6031 6032 // Build the copy of this field. 6033 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 6034 To.get(), From.get(), 6035 /*CopyingBaseSubobject=*/false); 6036 if (Copy.isInvalid()) { 6037 Diag(CurrentLocation, diag::note_member_synthesized_at) 6038 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6039 CopyAssignOperator->setInvalidDecl(); 6040 return; 6041 } 6042 6043 // Success! Record the copy. 6044 Statements.push_back(Copy.takeAs<Stmt>()); 6045 } 6046 6047 if (!Invalid) { 6048 // Add a "return *this;" 6049 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6050 6051 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 6052 if (Return.isInvalid()) 6053 Invalid = true; 6054 else { 6055 Statements.push_back(Return.takeAs<Stmt>()); 6056 6057 if (Trap.hasErrorOccurred()) { 6058 Diag(CurrentLocation, diag::note_member_synthesized_at) 6059 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6060 Invalid = true; 6061 } 6062 } 6063 } 6064 6065 if (Invalid) { 6066 CopyAssignOperator->setInvalidDecl(); 6067 return; 6068 } 6069 6070 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 6071 /*isStmtExpr=*/false); 6072 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 6073 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 6074 6075 if (ASTMutationListener *L = getASTMutationListener()) { 6076 L->CompletedImplicitDefinition(CopyAssignOperator); 6077 } 6078} 6079 6080CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 6081 CXXRecordDecl *ClassDecl) { 6082 // C++ [class.copy]p4: 6083 // If the class definition does not explicitly declare a copy 6084 // constructor, one is declared implicitly. 6085 6086 // C++ [class.copy]p5: 6087 // The implicitly-declared copy constructor for a class X will 6088 // have the form 6089 // 6090 // X::X(const X&) 6091 // 6092 // if 6093 bool HasConstCopyConstructor = true; 6094 6095 // -- each direct or virtual base class B of X has a copy 6096 // constructor whose first parameter is of type const B& or 6097 // const volatile B&, and 6098 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6099 BaseEnd = ClassDecl->bases_end(); 6100 HasConstCopyConstructor && Base != BaseEnd; 6101 ++Base) { 6102 // Virtual bases are handled below. 6103 if (Base->isVirtual()) 6104 continue; 6105 6106 CXXRecordDecl *BaseClassDecl 6107 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6108 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6109 DeclareImplicitCopyConstructor(BaseClassDecl); 6110 6111 HasConstCopyConstructor 6112 = BaseClassDecl->hasConstCopyConstructor(Context); 6113 } 6114 6115 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6116 BaseEnd = ClassDecl->vbases_end(); 6117 HasConstCopyConstructor && Base != BaseEnd; 6118 ++Base) { 6119 CXXRecordDecl *BaseClassDecl 6120 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6121 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6122 DeclareImplicitCopyConstructor(BaseClassDecl); 6123 6124 HasConstCopyConstructor 6125 = BaseClassDecl->hasConstCopyConstructor(Context); 6126 } 6127 6128 // -- for all the nonstatic data members of X that are of a 6129 // class type M (or array thereof), each such class type 6130 // has a copy constructor whose first parameter is of type 6131 // const M& or const volatile M&. 6132 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6133 FieldEnd = ClassDecl->field_end(); 6134 HasConstCopyConstructor && Field != FieldEnd; 6135 ++Field) { 6136 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6137 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6138 CXXRecordDecl *FieldClassDecl 6139 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6140 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6141 DeclareImplicitCopyConstructor(FieldClassDecl); 6142 6143 HasConstCopyConstructor 6144 = FieldClassDecl->hasConstCopyConstructor(Context); 6145 } 6146 } 6147 6148 // Otherwise, the implicitly declared copy constructor will have 6149 // the form 6150 // 6151 // X::X(X&) 6152 QualType ClassType = Context.getTypeDeclType(ClassDecl); 6153 QualType ArgType = ClassType; 6154 if (HasConstCopyConstructor) 6155 ArgType = ArgType.withConst(); 6156 ArgType = Context.getLValueReferenceType(ArgType); 6157 6158 // C++ [except.spec]p14: 6159 // An implicitly declared special member function (Clause 12) shall have an 6160 // exception-specification. [...] 6161 ImplicitExceptionSpecification ExceptSpec(Context); 6162 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 6163 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6164 BaseEnd = ClassDecl->bases_end(); 6165 Base != BaseEnd; 6166 ++Base) { 6167 // Virtual bases are handled below. 6168 if (Base->isVirtual()) 6169 continue; 6170 6171 CXXRecordDecl *BaseClassDecl 6172 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6173 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6174 DeclareImplicitCopyConstructor(BaseClassDecl); 6175 6176 if (CXXConstructorDecl *CopyConstructor 6177 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6178 ExceptSpec.CalledDecl(CopyConstructor); 6179 } 6180 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6181 BaseEnd = ClassDecl->vbases_end(); 6182 Base != BaseEnd; 6183 ++Base) { 6184 CXXRecordDecl *BaseClassDecl 6185 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6186 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 6187 DeclareImplicitCopyConstructor(BaseClassDecl); 6188 6189 if (CXXConstructorDecl *CopyConstructor 6190 = BaseClassDecl->getCopyConstructor(Context, Quals)) 6191 ExceptSpec.CalledDecl(CopyConstructor); 6192 } 6193 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6194 FieldEnd = ClassDecl->field_end(); 6195 Field != FieldEnd; 6196 ++Field) { 6197 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6198 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 6199 CXXRecordDecl *FieldClassDecl 6200 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 6201 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 6202 DeclareImplicitCopyConstructor(FieldClassDecl); 6203 6204 if (CXXConstructorDecl *CopyConstructor 6205 = FieldClassDecl->getCopyConstructor(Context, Quals)) 6206 ExceptSpec.CalledDecl(CopyConstructor); 6207 } 6208 } 6209 6210 // An implicitly-declared copy constructor is an inline public 6211 // member of its class. 6212 FunctionProtoType::ExtProtoInfo EPI; 6213 EPI.ExceptionSpecType = ExceptSpec.getExceptionSpecType(); 6214 EPI.NumExceptions = ExceptSpec.size(); 6215 EPI.Exceptions = ExceptSpec.data(); 6216 DeclarationName Name 6217 = Context.DeclarationNames.getCXXConstructorName( 6218 Context.getCanonicalType(ClassType)); 6219 SourceLocation ClassLoc = ClassDecl->getLocation(); 6220 DeclarationNameInfo NameInfo(Name, ClassLoc); 6221 CXXConstructorDecl *CopyConstructor 6222 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6223 Context.getFunctionType(Context.VoidTy, 6224 &ArgType, 1, EPI), 6225 /*TInfo=*/0, 6226 /*isExplicit=*/false, 6227 /*isInline=*/true, 6228 /*isImplicitlyDeclared=*/true); 6229 CopyConstructor->setAccess(AS_public); 6230 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 6231 6232 // Note that we have declared this constructor. 6233 ++ASTContext::NumImplicitCopyConstructorsDeclared; 6234 6235 // Add the parameter to the constructor. 6236 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 6237 ClassLoc, ClassLoc, 6238 /*IdentifierInfo=*/0, 6239 ArgType, /*TInfo=*/0, 6240 SC_None, 6241 SC_None, 0); 6242 CopyConstructor->setParams(&FromParam, 1); 6243 if (Scope *S = getScopeForContext(ClassDecl)) 6244 PushOnScopeChains(CopyConstructor, S, false); 6245 ClassDecl->addDecl(CopyConstructor); 6246 6247 return CopyConstructor; 6248} 6249 6250void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 6251 CXXConstructorDecl *CopyConstructor, 6252 unsigned TypeQuals) { 6253 assert((CopyConstructor->isImplicit() && 6254 CopyConstructor->isCopyConstructor(TypeQuals) && 6255 !CopyConstructor->isUsed(false)) && 6256 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 6257 6258 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 6259 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 6260 6261 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 6262 DiagnosticErrorTrap Trap(Diags); 6263 6264 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 6265 Trap.hasErrorOccurred()) { 6266 Diag(CurrentLocation, diag::note_member_synthesized_at) 6267 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 6268 CopyConstructor->setInvalidDecl(); 6269 } else { 6270 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 6271 CopyConstructor->getLocation(), 6272 MultiStmtArg(*this, 0, 0), 6273 /*isStmtExpr=*/false) 6274 .takeAs<Stmt>()); 6275 } 6276 6277 CopyConstructor->setUsed(); 6278 6279 if (ASTMutationListener *L = getASTMutationListener()) { 6280 L->CompletedImplicitDefinition(CopyConstructor); 6281 } 6282} 6283 6284ExprResult 6285Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6286 CXXConstructorDecl *Constructor, 6287 MultiExprArg ExprArgs, 6288 bool RequiresZeroInit, 6289 unsigned ConstructKind, 6290 SourceRange ParenRange) { 6291 bool Elidable = false; 6292 6293 // C++0x [class.copy]p34: 6294 // When certain criteria are met, an implementation is allowed to 6295 // omit the copy/move construction of a class object, even if the 6296 // copy/move constructor and/or destructor for the object have 6297 // side effects. [...] 6298 // - when a temporary class object that has not been bound to a 6299 // reference (12.2) would be copied/moved to a class object 6300 // with the same cv-unqualified type, the copy/move operation 6301 // can be omitted by constructing the temporary object 6302 // directly into the target of the omitted copy/move 6303 if (ConstructKind == CXXConstructExpr::CK_Complete && 6304 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 6305 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 6306 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 6307 } 6308 6309 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 6310 Elidable, move(ExprArgs), RequiresZeroInit, 6311 ConstructKind, ParenRange); 6312} 6313 6314/// BuildCXXConstructExpr - Creates a complete call to a constructor, 6315/// including handling of its default argument expressions. 6316ExprResult 6317Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 6318 CXXConstructorDecl *Constructor, bool Elidable, 6319 MultiExprArg ExprArgs, 6320 bool RequiresZeroInit, 6321 unsigned ConstructKind, 6322 SourceRange ParenRange) { 6323 unsigned NumExprs = ExprArgs.size(); 6324 Expr **Exprs = (Expr **)ExprArgs.release(); 6325 6326 for (specific_attr_iterator<NonNullAttr> 6327 i = Constructor->specific_attr_begin<NonNullAttr>(), 6328 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 6329 const NonNullAttr *NonNull = *i; 6330 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 6331 } 6332 6333 MarkDeclarationReferenced(ConstructLoc, Constructor); 6334 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 6335 Constructor, Elidable, Exprs, NumExprs, 6336 RequiresZeroInit, 6337 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 6338 ParenRange)); 6339} 6340 6341bool Sema::InitializeVarWithConstructor(VarDecl *VD, 6342 CXXConstructorDecl *Constructor, 6343 MultiExprArg Exprs) { 6344 // FIXME: Provide the correct paren SourceRange when available. 6345 ExprResult TempResult = 6346 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 6347 move(Exprs), false, CXXConstructExpr::CK_Complete, 6348 SourceRange()); 6349 if (TempResult.isInvalid()) 6350 return true; 6351 6352 Expr *Temp = TempResult.takeAs<Expr>(); 6353 CheckImplicitConversions(Temp, VD->getLocation()); 6354 MarkDeclarationReferenced(VD->getLocation(), Constructor); 6355 Temp = MaybeCreateExprWithCleanups(Temp); 6356 VD->setInit(Temp); 6357 6358 return false; 6359} 6360 6361void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 6362 if (VD->isInvalidDecl()) return; 6363 6364 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 6365 if (ClassDecl->isInvalidDecl()) return; 6366 if (ClassDecl->hasTrivialDestructor()) return; 6367 if (ClassDecl->isDependentContext()) return; 6368 6369 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 6370 MarkDeclarationReferenced(VD->getLocation(), Destructor); 6371 CheckDestructorAccess(VD->getLocation(), Destructor, 6372 PDiag(diag::err_access_dtor_var) 6373 << VD->getDeclName() 6374 << VD->getType()); 6375 6376 if (!VD->hasGlobalStorage()) return; 6377 6378 // Emit warning for non-trivial dtor in global scope (a real global, 6379 // class-static, function-static). 6380 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 6381 6382 // TODO: this should be re-enabled for static locals by !CXAAtExit 6383 if (!VD->isStaticLocal()) 6384 Diag(VD->getLocation(), diag::warn_global_destructor); 6385} 6386 6387/// AddCXXDirectInitializerToDecl - This action is called immediately after 6388/// ActOnDeclarator, when a C++ direct initializer is present. 6389/// e.g: "int x(1);" 6390void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 6391 SourceLocation LParenLoc, 6392 MultiExprArg Exprs, 6393 SourceLocation RParenLoc, 6394 bool TypeMayContainAuto) { 6395 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 6396 6397 // If there is no declaration, there was an error parsing it. Just ignore 6398 // the initializer. 6399 if (RealDecl == 0) 6400 return; 6401 6402 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6403 if (!VDecl) { 6404 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6405 RealDecl->setInvalidDecl(); 6406 return; 6407 } 6408 6409 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6410 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6411 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 6412 if (Exprs.size() > 1) { 6413 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 6414 diag::err_auto_var_init_multiple_expressions) 6415 << VDecl->getDeclName() << VDecl->getType() 6416 << VDecl->getSourceRange(); 6417 RealDecl->setInvalidDecl(); 6418 return; 6419 } 6420 6421 Expr *Init = Exprs.get()[0]; 6422 TypeSourceInfo *DeducedType = 0; 6423 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 6424 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 6425 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 6426 << Init->getSourceRange(); 6427 if (!DeducedType) { 6428 RealDecl->setInvalidDecl(); 6429 return; 6430 } 6431 VDecl->setTypeSourceInfo(DeducedType); 6432 VDecl->setType(DeducedType->getType()); 6433 6434 // If this is a redeclaration, check that the type we just deduced matches 6435 // the previously declared type. 6436 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 6437 MergeVarDeclTypes(VDecl, Old); 6438 } 6439 6440 // We will represent direct-initialization similarly to copy-initialization: 6441 // int x(1); -as-> int x = 1; 6442 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6443 // 6444 // Clients that want to distinguish between the two forms, can check for 6445 // direct initializer using VarDecl::hasCXXDirectInitializer(). 6446 // A major benefit is that clients that don't particularly care about which 6447 // exactly form was it (like the CodeGen) can handle both cases without 6448 // special case code. 6449 6450 // C++ 8.5p11: 6451 // The form of initialization (using parentheses or '=') is generally 6452 // insignificant, but does matter when the entity being initialized has a 6453 // class type. 6454 6455 if (!VDecl->getType()->isDependentType() && 6456 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 6457 diag::err_typecheck_decl_incomplete_type)) { 6458 VDecl->setInvalidDecl(); 6459 return; 6460 } 6461 6462 // The variable can not have an abstract class type. 6463 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6464 diag::err_abstract_type_in_decl, 6465 AbstractVariableType)) 6466 VDecl->setInvalidDecl(); 6467 6468 const VarDecl *Def; 6469 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6470 Diag(VDecl->getLocation(), diag::err_redefinition) 6471 << VDecl->getDeclName(); 6472 Diag(Def->getLocation(), diag::note_previous_definition); 6473 VDecl->setInvalidDecl(); 6474 return; 6475 } 6476 6477 // C++ [class.static.data]p4 6478 // If a static data member is of const integral or const 6479 // enumeration type, its declaration in the class definition can 6480 // specify a constant-initializer which shall be an integral 6481 // constant expression (5.19). In that case, the member can appear 6482 // in integral constant expressions. The member shall still be 6483 // defined in a namespace scope if it is used in the program and the 6484 // namespace scope definition shall not contain an initializer. 6485 // 6486 // We already performed a redefinition check above, but for static 6487 // data members we also need to check whether there was an in-class 6488 // declaration with an initializer. 6489 const VarDecl* PrevInit = 0; 6490 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6491 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 6492 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6493 return; 6494 } 6495 6496 bool IsDependent = false; 6497 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 6498 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 6499 VDecl->setInvalidDecl(); 6500 return; 6501 } 6502 6503 if (Exprs.get()[I]->isTypeDependent()) 6504 IsDependent = true; 6505 } 6506 6507 // If either the declaration has a dependent type or if any of the 6508 // expressions is type-dependent, we represent the initialization 6509 // via a ParenListExpr for later use during template instantiation. 6510 if (VDecl->getType()->isDependentType() || IsDependent) { 6511 // Let clients know that initialization was done with a direct initializer. 6512 VDecl->setCXXDirectInitializer(true); 6513 6514 // Store the initialization expressions as a ParenListExpr. 6515 unsigned NumExprs = Exprs.size(); 6516 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 6517 (Expr **)Exprs.release(), 6518 NumExprs, RParenLoc)); 6519 return; 6520 } 6521 6522 // Capture the variable that is being initialized and the style of 6523 // initialization. 6524 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6525 6526 // FIXME: Poor source location information. 6527 InitializationKind Kind 6528 = InitializationKind::CreateDirect(VDecl->getLocation(), 6529 LParenLoc, RParenLoc); 6530 6531 InitializationSequence InitSeq(*this, Entity, Kind, 6532 Exprs.get(), Exprs.size()); 6533 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 6534 if (Result.isInvalid()) { 6535 VDecl->setInvalidDecl(); 6536 return; 6537 } 6538 6539 CheckImplicitConversions(Result.get(), LParenLoc); 6540 6541 Result = MaybeCreateExprWithCleanups(Result); 6542 VDecl->setInit(Result.takeAs<Expr>()); 6543 VDecl->setCXXDirectInitializer(true); 6544 6545 CheckCompleteVariableDeclaration(VDecl); 6546} 6547 6548/// \brief Given a constructor and the set of arguments provided for the 6549/// constructor, convert the arguments and add any required default arguments 6550/// to form a proper call to this constructor. 6551/// 6552/// \returns true if an error occurred, false otherwise. 6553bool 6554Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 6555 MultiExprArg ArgsPtr, 6556 SourceLocation Loc, 6557 ASTOwningVector<Expr*> &ConvertedArgs) { 6558 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 6559 unsigned NumArgs = ArgsPtr.size(); 6560 Expr **Args = (Expr **)ArgsPtr.get(); 6561 6562 const FunctionProtoType *Proto 6563 = Constructor->getType()->getAs<FunctionProtoType>(); 6564 assert(Proto && "Constructor without a prototype?"); 6565 unsigned NumArgsInProto = Proto->getNumArgs(); 6566 6567 // If too few arguments are available, we'll fill in the rest with defaults. 6568 if (NumArgs < NumArgsInProto) 6569 ConvertedArgs.reserve(NumArgsInProto); 6570 else 6571 ConvertedArgs.reserve(NumArgs); 6572 6573 VariadicCallType CallType = 6574 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 6575 llvm::SmallVector<Expr *, 8> AllArgs; 6576 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 6577 Proto, 0, Args, NumArgs, AllArgs, 6578 CallType); 6579 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 6580 ConvertedArgs.push_back(AllArgs[i]); 6581 return Invalid; 6582} 6583 6584static inline bool 6585CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 6586 const FunctionDecl *FnDecl) { 6587 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 6588 if (isa<NamespaceDecl>(DC)) { 6589 return SemaRef.Diag(FnDecl->getLocation(), 6590 diag::err_operator_new_delete_declared_in_namespace) 6591 << FnDecl->getDeclName(); 6592 } 6593 6594 if (isa<TranslationUnitDecl>(DC) && 6595 FnDecl->getStorageClass() == SC_Static) { 6596 return SemaRef.Diag(FnDecl->getLocation(), 6597 diag::err_operator_new_delete_declared_static) 6598 << FnDecl->getDeclName(); 6599 } 6600 6601 return false; 6602} 6603 6604static inline bool 6605CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 6606 CanQualType ExpectedResultType, 6607 CanQualType ExpectedFirstParamType, 6608 unsigned DependentParamTypeDiag, 6609 unsigned InvalidParamTypeDiag) { 6610 QualType ResultType = 6611 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 6612 6613 // Check that the result type is not dependent. 6614 if (ResultType->isDependentType()) 6615 return SemaRef.Diag(FnDecl->getLocation(), 6616 diag::err_operator_new_delete_dependent_result_type) 6617 << FnDecl->getDeclName() << ExpectedResultType; 6618 6619 // Check that the result type is what we expect. 6620 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 6621 return SemaRef.Diag(FnDecl->getLocation(), 6622 diag::err_operator_new_delete_invalid_result_type) 6623 << FnDecl->getDeclName() << ExpectedResultType; 6624 6625 // A function template must have at least 2 parameters. 6626 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 6627 return SemaRef.Diag(FnDecl->getLocation(), 6628 diag::err_operator_new_delete_template_too_few_parameters) 6629 << FnDecl->getDeclName(); 6630 6631 // The function decl must have at least 1 parameter. 6632 if (FnDecl->getNumParams() == 0) 6633 return SemaRef.Diag(FnDecl->getLocation(), 6634 diag::err_operator_new_delete_too_few_parameters) 6635 << FnDecl->getDeclName(); 6636 6637 // Check the the first parameter type is not dependent. 6638 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 6639 if (FirstParamType->isDependentType()) 6640 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 6641 << FnDecl->getDeclName() << ExpectedFirstParamType; 6642 6643 // Check that the first parameter type is what we expect. 6644 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 6645 ExpectedFirstParamType) 6646 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 6647 << FnDecl->getDeclName() << ExpectedFirstParamType; 6648 6649 return false; 6650} 6651 6652static bool 6653CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6654 // C++ [basic.stc.dynamic.allocation]p1: 6655 // A program is ill-formed if an allocation function is declared in a 6656 // namespace scope other than global scope or declared static in global 6657 // scope. 6658 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6659 return true; 6660 6661 CanQualType SizeTy = 6662 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 6663 6664 // C++ [basic.stc.dynamic.allocation]p1: 6665 // The return type shall be void*. The first parameter shall have type 6666 // std::size_t. 6667 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 6668 SizeTy, 6669 diag::err_operator_new_dependent_param_type, 6670 diag::err_operator_new_param_type)) 6671 return true; 6672 6673 // C++ [basic.stc.dynamic.allocation]p1: 6674 // The first parameter shall not have an associated default argument. 6675 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 6676 return SemaRef.Diag(FnDecl->getLocation(), 6677 diag::err_operator_new_default_arg) 6678 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 6679 6680 return false; 6681} 6682 6683static bool 6684CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 6685 // C++ [basic.stc.dynamic.deallocation]p1: 6686 // A program is ill-formed if deallocation functions are declared in a 6687 // namespace scope other than global scope or declared static in global 6688 // scope. 6689 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 6690 return true; 6691 6692 // C++ [basic.stc.dynamic.deallocation]p2: 6693 // Each deallocation function shall return void and its first parameter 6694 // shall be void*. 6695 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 6696 SemaRef.Context.VoidPtrTy, 6697 diag::err_operator_delete_dependent_param_type, 6698 diag::err_operator_delete_param_type)) 6699 return true; 6700 6701 return false; 6702} 6703 6704/// CheckOverloadedOperatorDeclaration - Check whether the declaration 6705/// of this overloaded operator is well-formed. If so, returns false; 6706/// otherwise, emits appropriate diagnostics and returns true. 6707bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 6708 assert(FnDecl && FnDecl->isOverloadedOperator() && 6709 "Expected an overloaded operator declaration"); 6710 6711 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 6712 6713 // C++ [over.oper]p5: 6714 // The allocation and deallocation functions, operator new, 6715 // operator new[], operator delete and operator delete[], are 6716 // described completely in 3.7.3. The attributes and restrictions 6717 // found in the rest of this subclause do not apply to them unless 6718 // explicitly stated in 3.7.3. 6719 if (Op == OO_Delete || Op == OO_Array_Delete) 6720 return CheckOperatorDeleteDeclaration(*this, FnDecl); 6721 6722 if (Op == OO_New || Op == OO_Array_New) 6723 return CheckOperatorNewDeclaration(*this, FnDecl); 6724 6725 // C++ [over.oper]p6: 6726 // An operator function shall either be a non-static member 6727 // function or be a non-member function and have at least one 6728 // parameter whose type is a class, a reference to a class, an 6729 // enumeration, or a reference to an enumeration. 6730 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 6731 if (MethodDecl->isStatic()) 6732 return Diag(FnDecl->getLocation(), 6733 diag::err_operator_overload_static) << FnDecl->getDeclName(); 6734 } else { 6735 bool ClassOrEnumParam = false; 6736 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 6737 ParamEnd = FnDecl->param_end(); 6738 Param != ParamEnd; ++Param) { 6739 QualType ParamType = (*Param)->getType().getNonReferenceType(); 6740 if (ParamType->isDependentType() || ParamType->isRecordType() || 6741 ParamType->isEnumeralType()) { 6742 ClassOrEnumParam = true; 6743 break; 6744 } 6745 } 6746 6747 if (!ClassOrEnumParam) 6748 return Diag(FnDecl->getLocation(), 6749 diag::err_operator_overload_needs_class_or_enum) 6750 << FnDecl->getDeclName(); 6751 } 6752 6753 // C++ [over.oper]p8: 6754 // An operator function cannot have default arguments (8.3.6), 6755 // except where explicitly stated below. 6756 // 6757 // Only the function-call operator allows default arguments 6758 // (C++ [over.call]p1). 6759 if (Op != OO_Call) { 6760 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6761 Param != FnDecl->param_end(); ++Param) { 6762 if ((*Param)->hasDefaultArg()) 6763 return Diag((*Param)->getLocation(), 6764 diag::err_operator_overload_default_arg) 6765 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 6766 } 6767 } 6768 6769 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 6770 { false, false, false } 6771#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 6772 , { Unary, Binary, MemberOnly } 6773#include "clang/Basic/OperatorKinds.def" 6774 }; 6775 6776 bool CanBeUnaryOperator = OperatorUses[Op][0]; 6777 bool CanBeBinaryOperator = OperatorUses[Op][1]; 6778 bool MustBeMemberOperator = OperatorUses[Op][2]; 6779 6780 // C++ [over.oper]p8: 6781 // [...] Operator functions cannot have more or fewer parameters 6782 // than the number required for the corresponding operator, as 6783 // described in the rest of this subclause. 6784 unsigned NumParams = FnDecl->getNumParams() 6785 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 6786 if (Op != OO_Call && 6787 ((NumParams == 1 && !CanBeUnaryOperator) || 6788 (NumParams == 2 && !CanBeBinaryOperator) || 6789 (NumParams < 1) || (NumParams > 2))) { 6790 // We have the wrong number of parameters. 6791 unsigned ErrorKind; 6792 if (CanBeUnaryOperator && CanBeBinaryOperator) { 6793 ErrorKind = 2; // 2 -> unary or binary. 6794 } else if (CanBeUnaryOperator) { 6795 ErrorKind = 0; // 0 -> unary 6796 } else { 6797 assert(CanBeBinaryOperator && 6798 "All non-call overloaded operators are unary or binary!"); 6799 ErrorKind = 1; // 1 -> binary 6800 } 6801 6802 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 6803 << FnDecl->getDeclName() << NumParams << ErrorKind; 6804 } 6805 6806 // Overloaded operators other than operator() cannot be variadic. 6807 if (Op != OO_Call && 6808 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 6809 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 6810 << FnDecl->getDeclName(); 6811 } 6812 6813 // Some operators must be non-static member functions. 6814 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 6815 return Diag(FnDecl->getLocation(), 6816 diag::err_operator_overload_must_be_member) 6817 << FnDecl->getDeclName(); 6818 } 6819 6820 // C++ [over.inc]p1: 6821 // The user-defined function called operator++ implements the 6822 // prefix and postfix ++ operator. If this function is a member 6823 // function with no parameters, or a non-member function with one 6824 // parameter of class or enumeration type, it defines the prefix 6825 // increment operator ++ for objects of that type. If the function 6826 // is a member function with one parameter (which shall be of type 6827 // int) or a non-member function with two parameters (the second 6828 // of which shall be of type int), it defines the postfix 6829 // increment operator ++ for objects of that type. 6830 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 6831 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 6832 bool ParamIsInt = false; 6833 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 6834 ParamIsInt = BT->getKind() == BuiltinType::Int; 6835 6836 if (!ParamIsInt) 6837 return Diag(LastParam->getLocation(), 6838 diag::err_operator_overload_post_incdec_must_be_int) 6839 << LastParam->getType() << (Op == OO_MinusMinus); 6840 } 6841 6842 return false; 6843} 6844 6845/// CheckLiteralOperatorDeclaration - Check whether the declaration 6846/// of this literal operator function is well-formed. If so, returns 6847/// false; otherwise, emits appropriate diagnostics and returns true. 6848bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 6849 DeclContext *DC = FnDecl->getDeclContext(); 6850 Decl::Kind Kind = DC->getDeclKind(); 6851 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 6852 Kind != Decl::LinkageSpec) { 6853 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 6854 << FnDecl->getDeclName(); 6855 return true; 6856 } 6857 6858 bool Valid = false; 6859 6860 // template <char...> type operator "" name() is the only valid template 6861 // signature, and the only valid signature with no parameters. 6862 if (FnDecl->param_size() == 0) { 6863 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 6864 // Must have only one template parameter 6865 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 6866 if (Params->size() == 1) { 6867 NonTypeTemplateParmDecl *PmDecl = 6868 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 6869 6870 // The template parameter must be a char parameter pack. 6871 if (PmDecl && PmDecl->isTemplateParameterPack() && 6872 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 6873 Valid = true; 6874 } 6875 } 6876 } else { 6877 // Check the first parameter 6878 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 6879 6880 QualType T = (*Param)->getType(); 6881 6882 // unsigned long long int, long double, and any character type are allowed 6883 // as the only parameters. 6884 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 6885 Context.hasSameType(T, Context.LongDoubleTy) || 6886 Context.hasSameType(T, Context.CharTy) || 6887 Context.hasSameType(T, Context.WCharTy) || 6888 Context.hasSameType(T, Context.Char16Ty) || 6889 Context.hasSameType(T, Context.Char32Ty)) { 6890 if (++Param == FnDecl->param_end()) 6891 Valid = true; 6892 goto FinishedParams; 6893 } 6894 6895 // Otherwise it must be a pointer to const; let's strip those qualifiers. 6896 const PointerType *PT = T->getAs<PointerType>(); 6897 if (!PT) 6898 goto FinishedParams; 6899 T = PT->getPointeeType(); 6900 if (!T.isConstQualified()) 6901 goto FinishedParams; 6902 T = T.getUnqualifiedType(); 6903 6904 // Move on to the second parameter; 6905 ++Param; 6906 6907 // If there is no second parameter, the first must be a const char * 6908 if (Param == FnDecl->param_end()) { 6909 if (Context.hasSameType(T, Context.CharTy)) 6910 Valid = true; 6911 goto FinishedParams; 6912 } 6913 6914 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6915 // are allowed as the first parameter to a two-parameter function 6916 if (!(Context.hasSameType(T, Context.CharTy) || 6917 Context.hasSameType(T, Context.WCharTy) || 6918 Context.hasSameType(T, Context.Char16Ty) || 6919 Context.hasSameType(T, Context.Char32Ty))) 6920 goto FinishedParams; 6921 6922 // The second and final parameter must be an std::size_t 6923 T = (*Param)->getType().getUnqualifiedType(); 6924 if (Context.hasSameType(T, Context.getSizeType()) && 6925 ++Param == FnDecl->param_end()) 6926 Valid = true; 6927 } 6928 6929 // FIXME: This diagnostic is absolutely terrible. 6930FinishedParams: 6931 if (!Valid) { 6932 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6933 << FnDecl->getDeclName(); 6934 return true; 6935 } 6936 6937 return false; 6938} 6939 6940/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6941/// linkage specification, including the language and (if present) 6942/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6943/// the location of the language string literal, which is provided 6944/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6945/// the '{' brace. Otherwise, this linkage specification does not 6946/// have any braces. 6947Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 6948 SourceLocation LangLoc, 6949 llvm::StringRef Lang, 6950 SourceLocation LBraceLoc) { 6951 LinkageSpecDecl::LanguageIDs Language; 6952 if (Lang == "\"C\"") 6953 Language = LinkageSpecDecl::lang_c; 6954 else if (Lang == "\"C++\"") 6955 Language = LinkageSpecDecl::lang_cxx; 6956 else { 6957 Diag(LangLoc, diag::err_bad_language); 6958 return 0; 6959 } 6960 6961 // FIXME: Add all the various semantics of linkage specifications 6962 6963 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6964 ExternLoc, LangLoc, Language); 6965 CurContext->addDecl(D); 6966 PushDeclContext(S, D); 6967 return D; 6968} 6969 6970/// ActOnFinishLinkageSpecification - Complete the definition of 6971/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6972/// valid, it's the position of the closing '}' brace in a linkage 6973/// specification that uses braces. 6974Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6975 Decl *LinkageSpec, 6976 SourceLocation RBraceLoc) { 6977 if (LinkageSpec) { 6978 if (RBraceLoc.isValid()) { 6979 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 6980 LSDecl->setRBraceLoc(RBraceLoc); 6981 } 6982 PopDeclContext(); 6983 } 6984 return LinkageSpec; 6985} 6986 6987/// \brief Perform semantic analysis for the variable declaration that 6988/// occurs within a C++ catch clause, returning the newly-created 6989/// variable. 6990VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 6991 TypeSourceInfo *TInfo, 6992 SourceLocation StartLoc, 6993 SourceLocation Loc, 6994 IdentifierInfo *Name) { 6995 bool Invalid = false; 6996 QualType ExDeclType = TInfo->getType(); 6997 6998 // Arrays and functions decay. 6999 if (ExDeclType->isArrayType()) 7000 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7001 else if (ExDeclType->isFunctionType()) 7002 ExDeclType = Context.getPointerType(ExDeclType); 7003 7004 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7005 // The exception-declaration shall not denote a pointer or reference to an 7006 // incomplete type, other than [cv] void*. 7007 // N2844 forbids rvalue references. 7008 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 7009 Diag(Loc, diag::err_catch_rvalue_ref); 7010 Invalid = true; 7011 } 7012 7013 // GCC allows catching pointers and references to incomplete types 7014 // as an extension; so do we, but we warn by default. 7015 7016 QualType BaseType = ExDeclType; 7017 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 7018 unsigned DK = diag::err_catch_incomplete; 7019 bool IncompleteCatchIsInvalid = true; 7020 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 7021 BaseType = Ptr->getPointeeType(); 7022 Mode = 1; 7023 DK = diag::ext_catch_incomplete_ptr; 7024 IncompleteCatchIsInvalid = false; 7025 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 7026 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 7027 BaseType = Ref->getPointeeType(); 7028 Mode = 2; 7029 DK = diag::ext_catch_incomplete_ref; 7030 IncompleteCatchIsInvalid = false; 7031 } 7032 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 7033 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 7034 IncompleteCatchIsInvalid) 7035 Invalid = true; 7036 7037 if (!Invalid && !ExDeclType->isDependentType() && 7038 RequireNonAbstractType(Loc, ExDeclType, 7039 diag::err_abstract_type_in_decl, 7040 AbstractVariableType)) 7041 Invalid = true; 7042 7043 // Only the non-fragile NeXT runtime currently supports C++ catches 7044 // of ObjC types, and no runtime supports catching ObjC types by value. 7045 if (!Invalid && getLangOptions().ObjC1) { 7046 QualType T = ExDeclType; 7047 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 7048 T = RT->getPointeeType(); 7049 7050 if (T->isObjCObjectType()) { 7051 Diag(Loc, diag::err_objc_object_catch); 7052 Invalid = true; 7053 } else if (T->isObjCObjectPointerType()) { 7054 if (!getLangOptions().ObjCNonFragileABI) { 7055 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 7056 Invalid = true; 7057 } 7058 } 7059 } 7060 7061 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 7062 ExDeclType, TInfo, SC_None, SC_None); 7063 ExDecl->setExceptionVariable(true); 7064 7065 if (!Invalid) { 7066 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 7067 // C++ [except.handle]p16: 7068 // The object declared in an exception-declaration or, if the 7069 // exception-declaration does not specify a name, a temporary (12.2) is 7070 // copy-initialized (8.5) from the exception object. [...] 7071 // The object is destroyed when the handler exits, after the destruction 7072 // of any automatic objects initialized within the handler. 7073 // 7074 // We just pretend to initialize the object with itself, then make sure 7075 // it can be destroyed later. 7076 QualType initType = ExDeclType; 7077 7078 InitializedEntity entity = 7079 InitializedEntity::InitializeVariable(ExDecl); 7080 InitializationKind initKind = 7081 InitializationKind::CreateCopy(Loc, SourceLocation()); 7082 7083 Expr *opaqueValue = 7084 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 7085 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 7086 ExprResult result = sequence.Perform(*this, entity, initKind, 7087 MultiExprArg(&opaqueValue, 1)); 7088 if (result.isInvalid()) 7089 Invalid = true; 7090 else { 7091 // If the constructor used was non-trivial, set this as the 7092 // "initializer". 7093 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 7094 if (!construct->getConstructor()->isTrivial()) { 7095 Expr *init = MaybeCreateExprWithCleanups(construct); 7096 ExDecl->setInit(init); 7097 } 7098 7099 // And make sure it's destructable. 7100 FinalizeVarWithDestructor(ExDecl, recordType); 7101 } 7102 } 7103 } 7104 7105 if (Invalid) 7106 ExDecl->setInvalidDecl(); 7107 7108 return ExDecl; 7109} 7110 7111/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 7112/// handler. 7113Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 7114 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7115 bool Invalid = D.isInvalidType(); 7116 7117 // Check for unexpanded parameter packs. 7118 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7119 UPPC_ExceptionType)) { 7120 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7121 D.getIdentifierLoc()); 7122 Invalid = true; 7123 } 7124 7125 IdentifierInfo *II = D.getIdentifier(); 7126 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 7127 LookupOrdinaryName, 7128 ForRedeclaration)) { 7129 // The scope should be freshly made just for us. There is just no way 7130 // it contains any previous declaration. 7131 assert(!S->isDeclScope(PrevDecl)); 7132 if (PrevDecl->isTemplateParameter()) { 7133 // Maybe we will complain about the shadowed template parameter. 7134 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7135 } 7136 } 7137 7138 if (D.getCXXScopeSpec().isSet() && !Invalid) { 7139 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 7140 << D.getCXXScopeSpec().getRange(); 7141 Invalid = true; 7142 } 7143 7144 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 7145 D.getSourceRange().getBegin(), 7146 D.getIdentifierLoc(), 7147 D.getIdentifier()); 7148 if (Invalid) 7149 ExDecl->setInvalidDecl(); 7150 7151 // Add the exception declaration into this scope. 7152 if (II) 7153 PushOnScopeChains(ExDecl, S); 7154 else 7155 CurContext->addDecl(ExDecl); 7156 7157 ProcessDeclAttributes(S, ExDecl, D); 7158 return ExDecl; 7159} 7160 7161Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 7162 Expr *AssertExpr, 7163 Expr *AssertMessageExpr_, 7164 SourceLocation RParenLoc) { 7165 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 7166 7167 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 7168 llvm::APSInt Value(32); 7169 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 7170 Diag(StaticAssertLoc, 7171 diag::err_static_assert_expression_is_not_constant) << 7172 AssertExpr->getSourceRange(); 7173 return 0; 7174 } 7175 7176 if (Value == 0) { 7177 Diag(StaticAssertLoc, diag::err_static_assert_failed) 7178 << AssertMessage->getString() << AssertExpr->getSourceRange(); 7179 } 7180 } 7181 7182 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 7183 return 0; 7184 7185 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 7186 AssertExpr, AssertMessage, RParenLoc); 7187 7188 CurContext->addDecl(Decl); 7189 return Decl; 7190} 7191 7192/// \brief Perform semantic analysis of the given friend type declaration. 7193/// 7194/// \returns A friend declaration that. 7195FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 7196 TypeSourceInfo *TSInfo) { 7197 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 7198 7199 QualType T = TSInfo->getType(); 7200 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 7201 7202 if (!getLangOptions().CPlusPlus0x) { 7203 // C++03 [class.friend]p2: 7204 // An elaborated-type-specifier shall be used in a friend declaration 7205 // for a class.* 7206 // 7207 // * The class-key of the elaborated-type-specifier is required. 7208 if (!ActiveTemplateInstantiations.empty()) { 7209 // Do not complain about the form of friend template types during 7210 // template instantiation; we will already have complained when the 7211 // template was declared. 7212 } else if (!T->isElaboratedTypeSpecifier()) { 7213 // If we evaluated the type to a record type, suggest putting 7214 // a tag in front. 7215 if (const RecordType *RT = T->getAs<RecordType>()) { 7216 RecordDecl *RD = RT->getDecl(); 7217 7218 std::string InsertionText = std::string(" ") + RD->getKindName(); 7219 7220 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 7221 << (unsigned) RD->getTagKind() 7222 << T 7223 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 7224 InsertionText); 7225 } else { 7226 Diag(FriendLoc, diag::ext_nonclass_type_friend) 7227 << T 7228 << SourceRange(FriendLoc, TypeRange.getEnd()); 7229 } 7230 } else if (T->getAs<EnumType>()) { 7231 Diag(FriendLoc, diag::ext_enum_friend) 7232 << T 7233 << SourceRange(FriendLoc, TypeRange.getEnd()); 7234 } 7235 } 7236 7237 // C++0x [class.friend]p3: 7238 // If the type specifier in a friend declaration designates a (possibly 7239 // cv-qualified) class type, that class is declared as a friend; otherwise, 7240 // the friend declaration is ignored. 7241 7242 // FIXME: C++0x has some syntactic restrictions on friend type declarations 7243 // in [class.friend]p3 that we do not implement. 7244 7245 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 7246} 7247 7248/// Handle a friend tag declaration where the scope specifier was 7249/// templated. 7250Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 7251 unsigned TagSpec, SourceLocation TagLoc, 7252 CXXScopeSpec &SS, 7253 IdentifierInfo *Name, SourceLocation NameLoc, 7254 AttributeList *Attr, 7255 MultiTemplateParamsArg TempParamLists) { 7256 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7257 7258 bool isExplicitSpecialization = false; 7259 bool Invalid = false; 7260 7261 if (TemplateParameterList *TemplateParams 7262 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 7263 TempParamLists.get(), 7264 TempParamLists.size(), 7265 /*friend*/ true, 7266 isExplicitSpecialization, 7267 Invalid)) { 7268 if (TemplateParams->size() > 0) { 7269 // This is a declaration of a class template. 7270 if (Invalid) 7271 return 0; 7272 7273 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 7274 SS, Name, NameLoc, Attr, 7275 TemplateParams, AS_public, 7276 TempParamLists.size() - 1, 7277 (TemplateParameterList**) TempParamLists.release()).take(); 7278 } else { 7279 // The "template<>" header is extraneous. 7280 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7281 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7282 isExplicitSpecialization = true; 7283 } 7284 } 7285 7286 if (Invalid) return 0; 7287 7288 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 7289 7290 bool isAllExplicitSpecializations = true; 7291 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 7292 if (TempParamLists.get()[I]->size()) { 7293 isAllExplicitSpecializations = false; 7294 break; 7295 } 7296 } 7297 7298 // FIXME: don't ignore attributes. 7299 7300 // If it's explicit specializations all the way down, just forget 7301 // about the template header and build an appropriate non-templated 7302 // friend. TODO: for source fidelity, remember the headers. 7303 if (isAllExplicitSpecializations) { 7304 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7305 ElaboratedTypeKeyword Keyword 7306 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7307 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 7308 *Name, NameLoc); 7309 if (T.isNull()) 7310 return 0; 7311 7312 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7313 if (isa<DependentNameType>(T)) { 7314 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7315 TL.setKeywordLoc(TagLoc); 7316 TL.setQualifierLoc(QualifierLoc); 7317 TL.setNameLoc(NameLoc); 7318 } else { 7319 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 7320 TL.setKeywordLoc(TagLoc); 7321 TL.setQualifierLoc(QualifierLoc); 7322 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 7323 } 7324 7325 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7326 TSI, FriendLoc); 7327 Friend->setAccess(AS_public); 7328 CurContext->addDecl(Friend); 7329 return Friend; 7330 } 7331 7332 // Handle the case of a templated-scope friend class. e.g. 7333 // template <class T> class A<T>::B; 7334 // FIXME: we don't support these right now. 7335 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 7336 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 7337 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 7338 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 7339 TL.setKeywordLoc(TagLoc); 7340 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 7341 TL.setNameLoc(NameLoc); 7342 7343 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 7344 TSI, FriendLoc); 7345 Friend->setAccess(AS_public); 7346 Friend->setUnsupportedFriend(true); 7347 CurContext->addDecl(Friend); 7348 return Friend; 7349} 7350 7351 7352/// Handle a friend type declaration. This works in tandem with 7353/// ActOnTag. 7354/// 7355/// Notes on friend class templates: 7356/// 7357/// We generally treat friend class declarations as if they were 7358/// declaring a class. So, for example, the elaborated type specifier 7359/// in a friend declaration is required to obey the restrictions of a 7360/// class-head (i.e. no typedefs in the scope chain), template 7361/// parameters are required to match up with simple template-ids, &c. 7362/// However, unlike when declaring a template specialization, it's 7363/// okay to refer to a template specialization without an empty 7364/// template parameter declaration, e.g. 7365/// friend class A<T>::B<unsigned>; 7366/// We permit this as a special case; if there are any template 7367/// parameters present at all, require proper matching, i.e. 7368/// template <> template <class T> friend class A<int>::B; 7369Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 7370 MultiTemplateParamsArg TempParams) { 7371 SourceLocation Loc = DS.getSourceRange().getBegin(); 7372 7373 assert(DS.isFriendSpecified()); 7374 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7375 7376 // Try to convert the decl specifier to a type. This works for 7377 // friend templates because ActOnTag never produces a ClassTemplateDecl 7378 // for a TUK_Friend. 7379 Declarator TheDeclarator(DS, Declarator::MemberContext); 7380 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 7381 QualType T = TSI->getType(); 7382 if (TheDeclarator.isInvalidType()) 7383 return 0; 7384 7385 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 7386 return 0; 7387 7388 // This is definitely an error in C++98. It's probably meant to 7389 // be forbidden in C++0x, too, but the specification is just 7390 // poorly written. 7391 // 7392 // The problem is with declarations like the following: 7393 // template <T> friend A<T>::foo; 7394 // where deciding whether a class C is a friend or not now hinges 7395 // on whether there exists an instantiation of A that causes 7396 // 'foo' to equal C. There are restrictions on class-heads 7397 // (which we declare (by fiat) elaborated friend declarations to 7398 // be) that makes this tractable. 7399 // 7400 // FIXME: handle "template <> friend class A<T>;", which 7401 // is possibly well-formed? Who even knows? 7402 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 7403 Diag(Loc, diag::err_tagless_friend_type_template) 7404 << DS.getSourceRange(); 7405 return 0; 7406 } 7407 7408 // C++98 [class.friend]p1: A friend of a class is a function 7409 // or class that is not a member of the class . . . 7410 // This is fixed in DR77, which just barely didn't make the C++03 7411 // deadline. It's also a very silly restriction that seriously 7412 // affects inner classes and which nobody else seems to implement; 7413 // thus we never diagnose it, not even in -pedantic. 7414 // 7415 // But note that we could warn about it: it's always useless to 7416 // friend one of your own members (it's not, however, worthless to 7417 // friend a member of an arbitrary specialization of your template). 7418 7419 Decl *D; 7420 if (unsigned NumTempParamLists = TempParams.size()) 7421 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 7422 NumTempParamLists, 7423 TempParams.release(), 7424 TSI, 7425 DS.getFriendSpecLoc()); 7426 else 7427 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 7428 7429 if (!D) 7430 return 0; 7431 7432 D->setAccess(AS_public); 7433 CurContext->addDecl(D); 7434 7435 return D; 7436} 7437 7438Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 7439 MultiTemplateParamsArg TemplateParams) { 7440 const DeclSpec &DS = D.getDeclSpec(); 7441 7442 assert(DS.isFriendSpecified()); 7443 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 7444 7445 SourceLocation Loc = D.getIdentifierLoc(); 7446 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7447 QualType T = TInfo->getType(); 7448 7449 // C++ [class.friend]p1 7450 // A friend of a class is a function or class.... 7451 // Note that this sees through typedefs, which is intended. 7452 // It *doesn't* see through dependent types, which is correct 7453 // according to [temp.arg.type]p3: 7454 // If a declaration acquires a function type through a 7455 // type dependent on a template-parameter and this causes 7456 // a declaration that does not use the syntactic form of a 7457 // function declarator to have a function type, the program 7458 // is ill-formed. 7459 if (!T->isFunctionType()) { 7460 Diag(Loc, diag::err_unexpected_friend); 7461 7462 // It might be worthwhile to try to recover by creating an 7463 // appropriate declaration. 7464 return 0; 7465 } 7466 7467 // C++ [namespace.memdef]p3 7468 // - If a friend declaration in a non-local class first declares a 7469 // class or function, the friend class or function is a member 7470 // of the innermost enclosing namespace. 7471 // - The name of the friend is not found by simple name lookup 7472 // until a matching declaration is provided in that namespace 7473 // scope (either before or after the class declaration granting 7474 // friendship). 7475 // - If a friend function is called, its name may be found by the 7476 // name lookup that considers functions from namespaces and 7477 // classes associated with the types of the function arguments. 7478 // - When looking for a prior declaration of a class or a function 7479 // declared as a friend, scopes outside the innermost enclosing 7480 // namespace scope are not considered. 7481 7482 CXXScopeSpec &SS = D.getCXXScopeSpec(); 7483 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 7484 DeclarationName Name = NameInfo.getName(); 7485 assert(Name); 7486 7487 // Check for unexpanded parameter packs. 7488 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 7489 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 7490 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 7491 return 0; 7492 7493 // The context we found the declaration in, or in which we should 7494 // create the declaration. 7495 DeclContext *DC; 7496 Scope *DCScope = S; 7497 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 7498 ForRedeclaration); 7499 7500 // FIXME: there are different rules in local classes 7501 7502 // There are four cases here. 7503 // - There's no scope specifier, in which case we just go to the 7504 // appropriate scope and look for a function or function template 7505 // there as appropriate. 7506 // Recover from invalid scope qualifiers as if they just weren't there. 7507 if (SS.isInvalid() || !SS.isSet()) { 7508 // C++0x [namespace.memdef]p3: 7509 // If the name in a friend declaration is neither qualified nor 7510 // a template-id and the declaration is a function or an 7511 // elaborated-type-specifier, the lookup to determine whether 7512 // the entity has been previously declared shall not consider 7513 // any scopes outside the innermost enclosing namespace. 7514 // C++0x [class.friend]p11: 7515 // If a friend declaration appears in a local class and the name 7516 // specified is an unqualified name, a prior declaration is 7517 // looked up without considering scopes that are outside the 7518 // innermost enclosing non-class scope. For a friend function 7519 // declaration, if there is no prior declaration, the program is 7520 // ill-formed. 7521 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 7522 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 7523 7524 // Find the appropriate context according to the above. 7525 DC = CurContext; 7526 while (true) { 7527 // Skip class contexts. If someone can cite chapter and verse 7528 // for this behavior, that would be nice --- it's what GCC and 7529 // EDG do, and it seems like a reasonable intent, but the spec 7530 // really only says that checks for unqualified existing 7531 // declarations should stop at the nearest enclosing namespace, 7532 // not that they should only consider the nearest enclosing 7533 // namespace. 7534 while (DC->isRecord()) 7535 DC = DC->getParent(); 7536 7537 LookupQualifiedName(Previous, DC); 7538 7539 // TODO: decide what we think about using declarations. 7540 if (isLocal || !Previous.empty()) 7541 break; 7542 7543 if (isTemplateId) { 7544 if (isa<TranslationUnitDecl>(DC)) break; 7545 } else { 7546 if (DC->isFileContext()) break; 7547 } 7548 DC = DC->getParent(); 7549 } 7550 7551 // C++ [class.friend]p1: A friend of a class is a function or 7552 // class that is not a member of the class . . . 7553 // C++0x changes this for both friend types and functions. 7554 // Most C++ 98 compilers do seem to give an error here, so 7555 // we do, too. 7556 if (!Previous.empty() && DC->Equals(CurContext) 7557 && !getLangOptions().CPlusPlus0x) 7558 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7559 7560 DCScope = getScopeForDeclContext(S, DC); 7561 7562 // - There's a non-dependent scope specifier, in which case we 7563 // compute it and do a previous lookup there for a function 7564 // or function template. 7565 } else if (!SS.getScopeRep()->isDependent()) { 7566 DC = computeDeclContext(SS); 7567 if (!DC) return 0; 7568 7569 if (RequireCompleteDeclContext(SS, DC)) return 0; 7570 7571 LookupQualifiedName(Previous, DC); 7572 7573 // Ignore things found implicitly in the wrong scope. 7574 // TODO: better diagnostics for this case. Suggesting the right 7575 // qualified scope would be nice... 7576 LookupResult::Filter F = Previous.makeFilter(); 7577 while (F.hasNext()) { 7578 NamedDecl *D = F.next(); 7579 if (!DC->InEnclosingNamespaceSetOf( 7580 D->getDeclContext()->getRedeclContext())) 7581 F.erase(); 7582 } 7583 F.done(); 7584 7585 if (Previous.empty()) { 7586 D.setInvalidType(); 7587 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 7588 return 0; 7589 } 7590 7591 // C++ [class.friend]p1: A friend of a class is a function or 7592 // class that is not a member of the class . . . 7593 if (DC->Equals(CurContext)) 7594 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 7595 7596 // - There's a scope specifier that does not match any template 7597 // parameter lists, in which case we use some arbitrary context, 7598 // create a method or method template, and wait for instantiation. 7599 // - There's a scope specifier that does match some template 7600 // parameter lists, which we don't handle right now. 7601 } else { 7602 DC = CurContext; 7603 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 7604 } 7605 7606 if (!DC->isRecord()) { 7607 // This implies that it has to be an operator or function. 7608 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 7609 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 7610 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 7611 Diag(Loc, diag::err_introducing_special_friend) << 7612 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 7613 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 7614 return 0; 7615 } 7616 } 7617 7618 bool Redeclaration = false; 7619 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 7620 move(TemplateParams), 7621 IsDefinition, 7622 Redeclaration); 7623 if (!ND) return 0; 7624 7625 assert(ND->getDeclContext() == DC); 7626 assert(ND->getLexicalDeclContext() == CurContext); 7627 7628 // Add the function declaration to the appropriate lookup tables, 7629 // adjusting the redeclarations list as necessary. We don't 7630 // want to do this yet if the friending class is dependent. 7631 // 7632 // Also update the scope-based lookup if the target context's 7633 // lookup context is in lexical scope. 7634 if (!CurContext->isDependentContext()) { 7635 DC = DC->getRedeclContext(); 7636 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 7637 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7638 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 7639 } 7640 7641 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 7642 D.getIdentifierLoc(), ND, 7643 DS.getFriendSpecLoc()); 7644 FrD->setAccess(AS_public); 7645 CurContext->addDecl(FrD); 7646 7647 if (ND->isInvalidDecl()) 7648 FrD->setInvalidDecl(); 7649 else { 7650 FunctionDecl *FD; 7651 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 7652 FD = FTD->getTemplatedDecl(); 7653 else 7654 FD = cast<FunctionDecl>(ND); 7655 7656 // Mark templated-scope function declarations as unsupported. 7657 if (FD->getNumTemplateParameterLists()) 7658 FrD->setUnsupportedFriend(true); 7659 } 7660 7661 return ND; 7662} 7663 7664void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 7665 AdjustDeclIfTemplate(Dcl); 7666 7667 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 7668 if (!Fn) { 7669 Diag(DelLoc, diag::err_deleted_non_function); 7670 return; 7671 } 7672 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 7673 Diag(DelLoc, diag::err_deleted_decl_not_first); 7674 Diag(Prev->getLocation(), diag::note_previous_declaration); 7675 // If the declaration wasn't the first, we delete the function anyway for 7676 // recovery. 7677 } 7678 Fn->setDeletedAsWritten(); 7679} 7680 7681static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 7682 for (Stmt::child_range CI = S->children(); CI; ++CI) { 7683 Stmt *SubStmt = *CI; 7684 if (!SubStmt) 7685 continue; 7686 if (isa<ReturnStmt>(SubStmt)) 7687 Self.Diag(SubStmt->getSourceRange().getBegin(), 7688 diag::err_return_in_constructor_handler); 7689 if (!isa<Expr>(SubStmt)) 7690 SearchForReturnInStmt(Self, SubStmt); 7691 } 7692} 7693 7694void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 7695 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 7696 CXXCatchStmt *Handler = TryBlock->getHandler(I); 7697 SearchForReturnInStmt(*this, Handler); 7698 } 7699} 7700 7701bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 7702 const CXXMethodDecl *Old) { 7703 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 7704 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 7705 7706 if (Context.hasSameType(NewTy, OldTy) || 7707 NewTy->isDependentType() || OldTy->isDependentType()) 7708 return false; 7709 7710 // Check if the return types are covariant 7711 QualType NewClassTy, OldClassTy; 7712 7713 /// Both types must be pointers or references to classes. 7714 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 7715 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 7716 NewClassTy = NewPT->getPointeeType(); 7717 OldClassTy = OldPT->getPointeeType(); 7718 } 7719 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 7720 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 7721 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 7722 NewClassTy = NewRT->getPointeeType(); 7723 OldClassTy = OldRT->getPointeeType(); 7724 } 7725 } 7726 } 7727 7728 // The return types aren't either both pointers or references to a class type. 7729 if (NewClassTy.isNull()) { 7730 Diag(New->getLocation(), 7731 diag::err_different_return_type_for_overriding_virtual_function) 7732 << New->getDeclName() << NewTy << OldTy; 7733 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7734 7735 return true; 7736 } 7737 7738 // C++ [class.virtual]p6: 7739 // If the return type of D::f differs from the return type of B::f, the 7740 // class type in the return type of D::f shall be complete at the point of 7741 // declaration of D::f or shall be the class type D. 7742 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 7743 if (!RT->isBeingDefined() && 7744 RequireCompleteType(New->getLocation(), NewClassTy, 7745 PDiag(diag::err_covariant_return_incomplete) 7746 << New->getDeclName())) 7747 return true; 7748 } 7749 7750 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 7751 // Check if the new class derives from the old class. 7752 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 7753 Diag(New->getLocation(), 7754 diag::err_covariant_return_not_derived) 7755 << New->getDeclName() << NewTy << OldTy; 7756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7757 return true; 7758 } 7759 7760 // Check if we the conversion from derived to base is valid. 7761 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 7762 diag::err_covariant_return_inaccessible_base, 7763 diag::err_covariant_return_ambiguous_derived_to_base_conv, 7764 // FIXME: Should this point to the return type? 7765 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 7766 // FIXME: this note won't trigger for delayed access control 7767 // diagnostics, and it's impossible to get an undelayed error 7768 // here from access control during the original parse because 7769 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 7770 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7771 return true; 7772 } 7773 } 7774 7775 // The qualifiers of the return types must be the same. 7776 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 7777 Diag(New->getLocation(), 7778 diag::err_covariant_return_type_different_qualifications) 7779 << New->getDeclName() << NewTy << OldTy; 7780 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7781 return true; 7782 }; 7783 7784 7785 // The new class type must have the same or less qualifiers as the old type. 7786 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 7787 Diag(New->getLocation(), 7788 diag::err_covariant_return_type_class_type_more_qualified) 7789 << New->getDeclName() << NewTy << OldTy; 7790 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 7791 return true; 7792 }; 7793 7794 return false; 7795} 7796 7797/// \brief Mark the given method pure. 7798/// 7799/// \param Method the method to be marked pure. 7800/// 7801/// \param InitRange the source range that covers the "0" initializer. 7802bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 7803 SourceLocation EndLoc = InitRange.getEnd(); 7804 if (EndLoc.isValid()) 7805 Method->setRangeEnd(EndLoc); 7806 7807 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 7808 Method->setPure(); 7809 return false; 7810 } 7811 7812 if (!Method->isInvalidDecl()) 7813 Diag(Method->getLocation(), diag::err_non_virtual_pure) 7814 << Method->getDeclName() << InitRange; 7815 return true; 7816} 7817 7818/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 7819/// an initializer for the out-of-line declaration 'Dcl'. The scope 7820/// is a fresh scope pushed for just this purpose. 7821/// 7822/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 7823/// static data member of class X, names should be looked up in the scope of 7824/// class X. 7825void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 7826 // If there is no declaration, there was an error parsing it. 7827 if (D == 0 || D->isInvalidDecl()) return; 7828 7829 // We should only get called for declarations with scope specifiers, like: 7830 // int foo::bar; 7831 assert(D->isOutOfLine()); 7832 EnterDeclaratorContext(S, D->getDeclContext()); 7833} 7834 7835/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 7836/// initializer for the out-of-line declaration 'D'. 7837void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 7838 // If there is no declaration, there was an error parsing it. 7839 if (D == 0 || D->isInvalidDecl()) return; 7840 7841 assert(D->isOutOfLine()); 7842 ExitDeclaratorContext(S); 7843} 7844 7845/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 7846/// C++ if/switch/while/for statement. 7847/// e.g: "if (int x = f()) {...}" 7848DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 7849 // C++ 6.4p2: 7850 // The declarator shall not specify a function or an array. 7851 // The type-specifier-seq shall not contain typedef and shall not declare a 7852 // new class or enumeration. 7853 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 7854 "Parser allowed 'typedef' as storage class of condition decl."); 7855 7856 TagDecl *OwnedTag = 0; 7857 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 7858 QualType Ty = TInfo->getType(); 7859 7860 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 7861 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 7862 // would be created and CXXConditionDeclExpr wants a VarDecl. 7863 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 7864 << D.getSourceRange(); 7865 return DeclResult(); 7866 } else if (OwnedTag && OwnedTag->isDefinition()) { 7867 // The type-specifier-seq shall not declare a new class or enumeration. 7868 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 7869 } 7870 7871 Decl *Dcl = ActOnDeclarator(S, D); 7872 if (!Dcl) 7873 return DeclResult(); 7874 7875 return Dcl; 7876} 7877 7878void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 7879 bool DefinitionRequired) { 7880 // Ignore any vtable uses in unevaluated operands or for classes that do 7881 // not have a vtable. 7882 if (!Class->isDynamicClass() || Class->isDependentContext() || 7883 CurContext->isDependentContext() || 7884 ExprEvalContexts.back().Context == Unevaluated) 7885 return; 7886 7887 // Try to insert this class into the map. 7888 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7889 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 7890 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 7891 if (!Pos.second) { 7892 // If we already had an entry, check to see if we are promoting this vtable 7893 // to required a definition. If so, we need to reappend to the VTableUses 7894 // list, since we may have already processed the first entry. 7895 if (DefinitionRequired && !Pos.first->second) { 7896 Pos.first->second = true; 7897 } else { 7898 // Otherwise, we can early exit. 7899 return; 7900 } 7901 } 7902 7903 // Local classes need to have their virtual members marked 7904 // immediately. For all other classes, we mark their virtual members 7905 // at the end of the translation unit. 7906 if (Class->isLocalClass()) 7907 MarkVirtualMembersReferenced(Loc, Class); 7908 else 7909 VTableUses.push_back(std::make_pair(Class, Loc)); 7910} 7911 7912bool Sema::DefineUsedVTables() { 7913 if (VTableUses.empty()) 7914 return false; 7915 7916 // Note: The VTableUses vector could grow as a result of marking 7917 // the members of a class as "used", so we check the size each 7918 // time through the loop and prefer indices (with are stable) to 7919 // iterators (which are not). 7920 bool DefinedAnything = false; 7921 for (unsigned I = 0; I != VTableUses.size(); ++I) { 7922 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 7923 if (!Class) 7924 continue; 7925 7926 SourceLocation Loc = VTableUses[I].second; 7927 7928 // If this class has a key function, but that key function is 7929 // defined in another translation unit, we don't need to emit the 7930 // vtable even though we're using it. 7931 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 7932 if (KeyFunction && !KeyFunction->hasBody()) { 7933 switch (KeyFunction->getTemplateSpecializationKind()) { 7934 case TSK_Undeclared: 7935 case TSK_ExplicitSpecialization: 7936 case TSK_ExplicitInstantiationDeclaration: 7937 // The key function is in another translation unit. 7938 continue; 7939 7940 case TSK_ExplicitInstantiationDefinition: 7941 case TSK_ImplicitInstantiation: 7942 // We will be instantiating the key function. 7943 break; 7944 } 7945 } else if (!KeyFunction) { 7946 // If we have a class with no key function that is the subject 7947 // of an explicit instantiation declaration, suppress the 7948 // vtable; it will live with the explicit instantiation 7949 // definition. 7950 bool IsExplicitInstantiationDeclaration 7951 = Class->getTemplateSpecializationKind() 7952 == TSK_ExplicitInstantiationDeclaration; 7953 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 7954 REnd = Class->redecls_end(); 7955 R != REnd; ++R) { 7956 TemplateSpecializationKind TSK 7957 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 7958 if (TSK == TSK_ExplicitInstantiationDeclaration) 7959 IsExplicitInstantiationDeclaration = true; 7960 else if (TSK == TSK_ExplicitInstantiationDefinition) { 7961 IsExplicitInstantiationDeclaration = false; 7962 break; 7963 } 7964 } 7965 7966 if (IsExplicitInstantiationDeclaration) 7967 continue; 7968 } 7969 7970 // Mark all of the virtual members of this class as referenced, so 7971 // that we can build a vtable. Then, tell the AST consumer that a 7972 // vtable for this class is required. 7973 DefinedAnything = true; 7974 MarkVirtualMembersReferenced(Loc, Class); 7975 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 7976 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 7977 7978 // Optionally warn if we're emitting a weak vtable. 7979 if (Class->getLinkage() == ExternalLinkage && 7980 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 7981 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 7982 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 7983 } 7984 } 7985 VTableUses.clear(); 7986 7987 return DefinedAnything; 7988} 7989 7990void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 7991 const CXXRecordDecl *RD) { 7992 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 7993 e = RD->method_end(); i != e; ++i) { 7994 CXXMethodDecl *MD = *i; 7995 7996 // C++ [basic.def.odr]p2: 7997 // [...] A virtual member function is used if it is not pure. [...] 7998 if (MD->isVirtual() && !MD->isPure()) 7999 MarkDeclarationReferenced(Loc, MD); 8000 } 8001 8002 // Only classes that have virtual bases need a VTT. 8003 if (RD->getNumVBases() == 0) 8004 return; 8005 8006 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 8007 e = RD->bases_end(); i != e; ++i) { 8008 const CXXRecordDecl *Base = 8009 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 8010 if (Base->getNumVBases() == 0) 8011 continue; 8012 MarkVirtualMembersReferenced(Loc, Base); 8013 } 8014} 8015 8016/// SetIvarInitializers - This routine builds initialization ASTs for the 8017/// Objective-C implementation whose ivars need be initialized. 8018void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 8019 if (!getLangOptions().CPlusPlus) 8020 return; 8021 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 8022 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 8023 CollectIvarsToConstructOrDestruct(OID, ivars); 8024 if (ivars.empty()) 8025 return; 8026 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 8027 for (unsigned i = 0; i < ivars.size(); i++) { 8028 FieldDecl *Field = ivars[i]; 8029 if (Field->isInvalidDecl()) 8030 continue; 8031 8032 CXXCtorInitializer *Member; 8033 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 8034 InitializationKind InitKind = 8035 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 8036 8037 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 8038 ExprResult MemberInit = 8039 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 8040 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 8041 // Note, MemberInit could actually come back empty if no initialization 8042 // is required (e.g., because it would call a trivial default constructor) 8043 if (!MemberInit.get() || MemberInit.isInvalid()) 8044 continue; 8045 8046 Member = 8047 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 8048 SourceLocation(), 8049 MemberInit.takeAs<Expr>(), 8050 SourceLocation()); 8051 AllToInit.push_back(Member); 8052 8053 // Be sure that the destructor is accessible and is marked as referenced. 8054 if (const RecordType *RecordTy 8055 = Context.getBaseElementType(Field->getType()) 8056 ->getAs<RecordType>()) { 8057 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 8058 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 8059 MarkDeclarationReferenced(Field->getLocation(), Destructor); 8060 CheckDestructorAccess(Field->getLocation(), Destructor, 8061 PDiag(diag::err_access_dtor_ivar) 8062 << Context.getBaseElementType(Field->getType())); 8063 } 8064 } 8065 } 8066 ObjCImplementation->setIvarInitializers(Context, 8067 AllToInit.data(), AllToInit.size()); 8068 } 8069} 8070 8071static 8072void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 8073 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 8074 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 8075 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 8076 Sema &S) { 8077 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8078 CE = Current.end(); 8079 if (Ctor->isInvalidDecl()) 8080 return; 8081 8082 const FunctionDecl *FNTarget = 0; 8083 CXXConstructorDecl *Target; 8084 8085 // We ignore the result here since if we don't have a body, Target will be 8086 // null below. 8087 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 8088 Target 8089= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 8090 8091 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 8092 // Avoid dereferencing a null pointer here. 8093 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 8094 8095 if (!Current.insert(Canonical)) 8096 return; 8097 8098 // We know that beyond here, we aren't chaining into a cycle. 8099 if (!Target || !Target->isDelegatingConstructor() || 8100 Target->isInvalidDecl() || Valid.count(TCanonical)) { 8101 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8102 Valid.insert(*CI); 8103 Current.clear(); 8104 // We've hit a cycle. 8105 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 8106 Current.count(TCanonical)) { 8107 // If we haven't diagnosed this cycle yet, do so now. 8108 if (!Invalid.count(TCanonical)) { 8109 S.Diag((*Ctor->init_begin())->getSourceLocation(), 8110 diag::warn_delegating_ctor_cycle) 8111 << Ctor; 8112 8113 // Don't add a note for a function delegating directo to itself. 8114 if (TCanonical != Canonical) 8115 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 8116 8117 CXXConstructorDecl *C = Target; 8118 while (C->getCanonicalDecl() != Canonical) { 8119 (void)C->getTargetConstructor()->hasBody(FNTarget); 8120 assert(FNTarget && "Ctor cycle through bodiless function"); 8121 8122 C 8123 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 8124 S.Diag(C->getLocation(), diag::note_which_delegates_to); 8125 } 8126 } 8127 8128 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 8129 Invalid.insert(*CI); 8130 Current.clear(); 8131 } else { 8132 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 8133 } 8134} 8135 8136 8137void Sema::CheckDelegatingCtorCycles() { 8138 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 8139 8140 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 8141 CE = Current.end(); 8142 8143 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 8144 I = DelegatingCtorDecls.begin(), 8145 E = DelegatingCtorDecls.end(); 8146 I != E; ++I) { 8147 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 8148 } 8149 8150 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 8151 (*CI)->setInvalidDecl(); 8152} 8153