SemaDeclCXX.cpp revision 24146975f1af8c1b4b14e8545f218129d0e7dfeb
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/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/EvaluatedExprVisitor.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/RecordLayout.h" 24#include "clang/AST/RecursiveASTVisitor.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Lex/LiteralSupport.h" 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Sema/CXXFieldCollector.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/Initialization.h" 35#include "clang/Sema/Lookup.h" 36#include "clang/Sema/ParsedTemplate.h" 37#include "clang/Sema/Scope.h" 38#include "clang/Sema/ScopeInfo.h" 39#include "llvm/ADT/STLExtras.h" 40#include "llvm/ADT/SmallString.h" 41#include <map> 42#include <set> 43 44using namespace clang; 45 46//===----------------------------------------------------------------------===// 47// CheckDefaultArgumentVisitor 48//===----------------------------------------------------------------------===// 49 50namespace { 51 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 52 /// the default argument of a parameter to determine whether it 53 /// contains any ill-formed subexpressions. For example, this will 54 /// diagnose the use of local variables or parameters within the 55 /// default argument expression. 56 class CheckDefaultArgumentVisitor 57 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 58 Expr *DefaultArg; 59 Sema *S; 60 61 public: 62 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 63 : DefaultArg(defarg), S(s) {} 64 65 bool VisitExpr(Expr *Node); 66 bool VisitDeclRefExpr(DeclRefExpr *DRE); 67 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 68 bool VisitLambdaExpr(LambdaExpr *Lambda); 69 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); 70 }; 71 72 /// VisitExpr - Visit all of the children of this expression. 73 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 74 bool IsInvalid = false; 75 for (Stmt::child_range I = Node->children(); I; ++I) 76 IsInvalid |= Visit(*I); 77 return IsInvalid; 78 } 79 80 /// VisitDeclRefExpr - Visit a reference to a declaration, to 81 /// determine whether this declaration can be used in the default 82 /// argument expression. 83 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 84 NamedDecl *Decl = DRE->getDecl(); 85 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p9 87 // Default arguments are evaluated each time the function is 88 // called. The order of evaluation of function arguments is 89 // unspecified. Consequently, parameters of a function shall not 90 // be used in default argument expressions, even if they are not 91 // evaluated. Parameters of a function declared before a default 92 // argument expression are in scope and can hide namespace and 93 // class member names. 94 return S->Diag(DRE->getLocStart(), 95 diag::err_param_default_argument_references_param) 96 << Param->getDeclName() << DefaultArg->getSourceRange(); 97 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 98 // C++ [dcl.fct.default]p7 99 // Local variables shall not be used in default argument 100 // expressions. 101 if (VDecl->isLocalVarDecl()) 102 return S->Diag(DRE->getLocStart(), 103 diag::err_param_default_argument_references_local) 104 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 105 } 106 107 return false; 108 } 109 110 /// VisitCXXThisExpr - Visit a C++ "this" expression. 111 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 112 // C++ [dcl.fct.default]p8: 113 // The keyword this shall not be used in a default argument of a 114 // member function. 115 return S->Diag(ThisE->getLocStart(), 116 diag::err_param_default_argument_references_this) 117 << ThisE->getSourceRange(); 118 } 119 120 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { 121 bool Invalid = false; 122 for (PseudoObjectExpr::semantics_iterator 123 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { 124 Expr *E = *i; 125 126 // Look through bindings. 127 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { 128 E = OVE->getSourceExpr(); 129 assert(E && "pseudo-object binding without source expression?"); 130 } 131 132 Invalid |= Visit(E); 133 } 134 return Invalid; 135 } 136 137 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 138 // C++11 [expr.lambda.prim]p13: 139 // A lambda-expression appearing in a default argument shall not 140 // implicitly or explicitly capture any entity. 141 if (Lambda->capture_begin() == Lambda->capture_end()) 142 return false; 143 144 return S->Diag(Lambda->getLocStart(), 145 diag::err_lambda_capture_default_arg); 146 } 147} 148 149void 150Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 151 const CXXMethodDecl *Method) { 152 // If we have an MSAny spec already, don't bother. 153 if (!Method || ComputedEST == EST_MSAny) 154 return; 155 156 const FunctionProtoType *Proto 157 = Method->getType()->getAs<FunctionProtoType>(); 158 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 159 if (!Proto) 160 return; 161 162 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 163 164 // If this function can throw any exceptions, make a note of that. 165 if (EST == EST_MSAny || EST == EST_None) { 166 ClearExceptions(); 167 ComputedEST = EST; 168 return; 169 } 170 171 // FIXME: If the call to this decl is using any of its default arguments, we 172 // need to search them for potentially-throwing calls. 173 174 // If this function has a basic noexcept, it doesn't affect the outcome. 175 if (EST == EST_BasicNoexcept) 176 return; 177 178 // If we have a throw-all spec at this point, ignore the function. 179 if (ComputedEST == EST_None) 180 return; 181 182 // If we're still at noexcept(true) and there's a nothrow() callee, 183 // change to that specification. 184 if (EST == EST_DynamicNone) { 185 if (ComputedEST == EST_BasicNoexcept) 186 ComputedEST = EST_DynamicNone; 187 return; 188 } 189 190 // Check out noexcept specs. 191 if (EST == EST_ComputedNoexcept) { 192 FunctionProtoType::NoexceptResult NR = 193 Proto->getNoexceptSpec(Self->Context); 194 assert(NR != FunctionProtoType::NR_NoNoexcept && 195 "Must have noexcept result for EST_ComputedNoexcept."); 196 assert(NR != FunctionProtoType::NR_Dependent && 197 "Should not generate implicit declarations for dependent cases, " 198 "and don't know how to handle them anyway."); 199 200 // noexcept(false) -> no spec on the new function 201 if (NR == FunctionProtoType::NR_Throw) { 202 ClearExceptions(); 203 ComputedEST = EST_None; 204 } 205 // noexcept(true) won't change anything either. 206 return; 207 } 208 209 assert(EST == EST_Dynamic && "EST case not considered earlier."); 210 assert(ComputedEST != EST_None && 211 "Shouldn't collect exceptions when throw-all is guaranteed."); 212 ComputedEST = EST_Dynamic; 213 // Record the exceptions in this function's exception specification. 214 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 215 EEnd = Proto->exception_end(); 216 E != EEnd; ++E) 217 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 218 Exceptions.push_back(*E); 219} 220 221void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 222 if (!E || ComputedEST == EST_MSAny) 223 return; 224 225 // FIXME: 226 // 227 // C++0x [except.spec]p14: 228 // [An] implicit exception-specification specifies the type-id T if and 229 // only if T is allowed by the exception-specification of a function directly 230 // invoked by f's implicit definition; f shall allow all exceptions if any 231 // function it directly invokes allows all exceptions, and f shall allow no 232 // exceptions if every function it directly invokes allows no exceptions. 233 // 234 // Note in particular that if an implicit exception-specification is generated 235 // for a function containing a throw-expression, that specification can still 236 // be noexcept(true). 237 // 238 // Note also that 'directly invoked' is not defined in the standard, and there 239 // is no indication that we should only consider potentially-evaluated calls. 240 // 241 // Ultimately we should implement the intent of the standard: the exception 242 // specification should be the set of exceptions which can be thrown by the 243 // implicit definition. For now, we assume that any non-nothrow expression can 244 // throw any exception. 245 246 if (Self->canThrow(E)) 247 ComputedEST = EST_None; 248} 249 250bool 251Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 252 SourceLocation EqualLoc) { 253 if (RequireCompleteType(Param->getLocation(), Param->getType(), 254 diag::err_typecheck_decl_incomplete_type)) { 255 Param->setInvalidDecl(); 256 return true; 257 } 258 259 // C++ [dcl.fct.default]p5 260 // A default argument expression is implicitly converted (clause 261 // 4) to the parameter type. The default argument expression has 262 // the same semantic constraints as the initializer expression in 263 // a declaration of a variable of the parameter type, using the 264 // copy-initialization semantics (8.5). 265 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 266 Param); 267 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 268 EqualLoc); 269 InitializationSequence InitSeq(*this, Entity, Kind, Arg); 270 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 271 if (Result.isInvalid()) 272 return true; 273 Arg = Result.takeAs<Expr>(); 274 275 CheckCompletedExpr(Arg, EqualLoc); 276 Arg = MaybeCreateExprWithCleanups(Arg); 277 278 // Okay: add the default argument to the parameter 279 Param->setDefaultArg(Arg); 280 281 // We have already instantiated this parameter; provide each of the 282 // instantiations with the uninstantiated default argument. 283 UnparsedDefaultArgInstantiationsMap::iterator InstPos 284 = UnparsedDefaultArgInstantiations.find(Param); 285 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 286 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 287 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 288 289 // We're done tracking this parameter's instantiations. 290 UnparsedDefaultArgInstantiations.erase(InstPos); 291 } 292 293 return false; 294} 295 296/// ActOnParamDefaultArgument - Check whether the default argument 297/// provided for a function parameter is well-formed. If so, attach it 298/// to the parameter declaration. 299void 300Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 301 Expr *DefaultArg) { 302 if (!param || !DefaultArg) 303 return; 304 305 ParmVarDecl *Param = cast<ParmVarDecl>(param); 306 UnparsedDefaultArgLocs.erase(Param); 307 308 // Default arguments are only permitted in C++ 309 if (!getLangOpts().CPlusPlus) { 310 Diag(EqualLoc, diag::err_param_default_argument) 311 << DefaultArg->getSourceRange(); 312 Param->setInvalidDecl(); 313 return; 314 } 315 316 // Check for unexpanded parameter packs. 317 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 318 Param->setInvalidDecl(); 319 return; 320 } 321 322 // Check that the default argument is well-formed 323 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 324 if (DefaultArgChecker.Visit(DefaultArg)) { 325 Param->setInvalidDecl(); 326 return; 327 } 328 329 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 330} 331 332/// ActOnParamUnparsedDefaultArgument - We've seen a default 333/// argument for a function parameter, but we can't parse it yet 334/// because we're inside a class definition. Note that this default 335/// argument will be parsed later. 336void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 337 SourceLocation EqualLoc, 338 SourceLocation ArgLoc) { 339 if (!param) 340 return; 341 342 ParmVarDecl *Param = cast<ParmVarDecl>(param); 343 if (Param) 344 Param->setUnparsedDefaultArg(); 345 346 UnparsedDefaultArgLocs[Param] = ArgLoc; 347} 348 349/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 350/// the default argument for the parameter param failed. 351void Sema::ActOnParamDefaultArgumentError(Decl *param) { 352 if (!param) 353 return; 354 355 ParmVarDecl *Param = cast<ParmVarDecl>(param); 356 357 Param->setInvalidDecl(); 358 359 UnparsedDefaultArgLocs.erase(Param); 360} 361 362/// CheckExtraCXXDefaultArguments - Check for any extra default 363/// arguments in the declarator, which is not a function declaration 364/// or definition and therefore is not permitted to have default 365/// arguments. This routine should be invoked for every declarator 366/// that is not a function declaration or definition. 367void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 368 // C++ [dcl.fct.default]p3 369 // A default argument expression shall be specified only in the 370 // parameter-declaration-clause of a function declaration or in a 371 // template-parameter (14.1). It shall not be specified for a 372 // parameter pack. If it is specified in a 373 // parameter-declaration-clause, it shall not occur within a 374 // declarator or abstract-declarator of a parameter-declaration. 375 bool MightBeFunction = D.isFunctionDeclarationContext(); 376 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 377 DeclaratorChunk &chunk = D.getTypeObject(i); 378 if (chunk.Kind == DeclaratorChunk::Function) { 379 if (MightBeFunction) { 380 // This is a function declaration. It can have default arguments, but 381 // keep looking in case its return type is a function type with default 382 // arguments. 383 MightBeFunction = false; 384 continue; 385 } 386 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 387 ParmVarDecl *Param = 388 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 389 if (Param->hasUnparsedDefaultArg()) { 390 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 391 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 392 << SourceRange((*Toks)[1].getLocation(), 393 Toks->back().getLocation()); 394 delete Toks; 395 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 396 } else if (Param->getDefaultArg()) { 397 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 398 << Param->getDefaultArg()->getSourceRange(); 399 Param->setDefaultArg(0); 400 } 401 } 402 } else if (chunk.Kind != DeclaratorChunk::Paren) { 403 MightBeFunction = false; 404 } 405 } 406} 407 408static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { 409 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) { 410 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1); 411 if (!PVD->hasDefaultArg()) 412 return false; 413 if (!PVD->hasInheritedDefaultArg()) 414 return true; 415 } 416 return false; 417} 418 419/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 420/// function, once we already know that they have the same 421/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 422/// error, false otherwise. 423bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 424 Scope *S) { 425 bool Invalid = false; 426 427 // C++ [dcl.fct.default]p4: 428 // For non-template functions, default arguments can be added in 429 // later declarations of a function in the same 430 // scope. Declarations in different scopes have completely 431 // distinct sets of default arguments. That is, declarations in 432 // inner scopes do not acquire default arguments from 433 // declarations in outer scopes, and vice versa. In a given 434 // function declaration, all parameters subsequent to a 435 // parameter with a default argument shall have default 436 // arguments supplied in this or previous declarations. A 437 // default argument shall not be redefined by a later 438 // declaration (not even to the same value). 439 // 440 // C++ [dcl.fct.default]p6: 441 // Except for member functions of class templates, the default arguments 442 // in a member function definition that appears outside of the class 443 // definition are added to the set of default arguments provided by the 444 // member function declaration in the class definition. 445 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 446 ParmVarDecl *OldParam = Old->getParamDecl(p); 447 ParmVarDecl *NewParam = New->getParamDecl(p); 448 449 bool OldParamHasDfl = OldParam->hasDefaultArg(); 450 bool NewParamHasDfl = NewParam->hasDefaultArg(); 451 452 NamedDecl *ND = Old; 453 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 454 // Ignore default parameters of old decl if they are not in 455 // the same scope. 456 OldParamHasDfl = false; 457 458 if (OldParamHasDfl && NewParamHasDfl) { 459 460 unsigned DiagDefaultParamID = 461 diag::err_param_default_argument_redefinition; 462 463 // MSVC accepts that default parameters be redefined for member functions 464 // of template class. The new default parameter's value is ignored. 465 Invalid = true; 466 if (getLangOpts().MicrosoftExt) { 467 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 468 if (MD && MD->getParent()->getDescribedClassTemplate()) { 469 // Merge the old default argument into the new parameter. 470 NewParam->setHasInheritedDefaultArg(); 471 if (OldParam->hasUninstantiatedDefaultArg()) 472 NewParam->setUninstantiatedDefaultArg( 473 OldParam->getUninstantiatedDefaultArg()); 474 else 475 NewParam->setDefaultArg(OldParam->getInit()); 476 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 477 Invalid = false; 478 } 479 } 480 481 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 482 // hint here. Alternatively, we could walk the type-source information 483 // for NewParam to find the last source location in the type... but it 484 // isn't worth the effort right now. This is the kind of test case that 485 // is hard to get right: 486 // int f(int); 487 // void g(int (*fp)(int) = f); 488 // void g(int (*fp)(int) = &f); 489 Diag(NewParam->getLocation(), DiagDefaultParamID) 490 << NewParam->getDefaultArgRange(); 491 492 // Look for the function declaration where the default argument was 493 // actually written, which may be a declaration prior to Old. 494 for (FunctionDecl *Older = Old->getPreviousDecl(); 495 Older; Older = Older->getPreviousDecl()) { 496 if (!Older->getParamDecl(p)->hasDefaultArg()) 497 break; 498 499 OldParam = Older->getParamDecl(p); 500 } 501 502 Diag(OldParam->getLocation(), diag::note_previous_definition) 503 << OldParam->getDefaultArgRange(); 504 } else if (OldParamHasDfl) { 505 // Merge the old default argument into the new parameter. 506 // It's important to use getInit() here; getDefaultArg() 507 // strips off any top-level ExprWithCleanups. 508 NewParam->setHasInheritedDefaultArg(); 509 if (OldParam->hasUninstantiatedDefaultArg()) 510 NewParam->setUninstantiatedDefaultArg( 511 OldParam->getUninstantiatedDefaultArg()); 512 else 513 NewParam->setDefaultArg(OldParam->getInit()); 514 } else if (NewParamHasDfl) { 515 if (New->getDescribedFunctionTemplate()) { 516 // Paragraph 4, quoted above, only applies to non-template functions. 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_template_redecl) 519 << NewParam->getDefaultArgRange(); 520 Diag(Old->getLocation(), diag::note_template_prev_declaration) 521 << false; 522 } else if (New->getTemplateSpecializationKind() 523 != TSK_ImplicitInstantiation && 524 New->getTemplateSpecializationKind() != TSK_Undeclared) { 525 // C++ [temp.expr.spec]p21: 526 // Default function arguments shall not be specified in a declaration 527 // or a definition for one of the following explicit specializations: 528 // - the explicit specialization of a function template; 529 // - the explicit specialization of a member function template; 530 // - the explicit specialization of a member function of a class 531 // template where the class template specialization to which the 532 // member function specialization belongs is implicitly 533 // instantiated. 534 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 535 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 536 << New->getDeclName() 537 << NewParam->getDefaultArgRange(); 538 } else if (New->getDeclContext()->isDependentContext()) { 539 // C++ [dcl.fct.default]p6 (DR217): 540 // Default arguments for a member function of a class template shall 541 // be specified on the initial declaration of the member function 542 // within the class template. 543 // 544 // Reading the tea leaves a bit in DR217 and its reference to DR205 545 // leads me to the conclusion that one cannot add default function 546 // arguments for an out-of-line definition of a member function of a 547 // dependent type. 548 int WhichKind = 2; 549 if (CXXRecordDecl *Record 550 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 551 if (Record->getDescribedClassTemplate()) 552 WhichKind = 0; 553 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 554 WhichKind = 1; 555 else 556 WhichKind = 2; 557 } 558 559 Diag(NewParam->getLocation(), 560 diag::err_param_default_argument_member_template_redecl) 561 << WhichKind 562 << NewParam->getDefaultArgRange(); 563 } 564 } 565 } 566 567 // DR1344: If a default argument is added outside a class definition and that 568 // default argument makes the function a special member function, the program 569 // is ill-formed. This can only happen for constructors. 570 if (isa<CXXConstructorDecl>(New) && 571 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 572 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 573 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 574 if (NewSM != OldSM) { 575 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 576 assert(NewParam->hasDefaultArg()); 577 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 578 << NewParam->getDefaultArgRange() << NewSM; 579 Diag(Old->getLocation(), diag::note_previous_declaration); 580 } 581 } 582 583 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 584 // template has a constexpr specifier then all its declarations shall 585 // contain the constexpr specifier. 586 if (New->isConstexpr() != Old->isConstexpr()) { 587 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 588 << New << New->isConstexpr(); 589 Diag(Old->getLocation(), diag::note_previous_declaration); 590 Invalid = true; 591 } 592 593 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default 594 // argument expression, that declaration shall be a definition and shall be 595 // the only declaration of the function or function template in the 596 // translation unit. 597 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && 598 functionDeclHasDefaultArgument(Old)) { 599 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 600 Diag(Old->getLocation(), diag::note_previous_declaration); 601 Invalid = true; 602 } 603 604 if (CheckEquivalentExceptionSpec(Old, New)) 605 Invalid = true; 606 607 return Invalid; 608} 609 610/// \brief Merge the exception specifications of two variable declarations. 611/// 612/// This is called when there's a redeclaration of a VarDecl. The function 613/// checks if the redeclaration might have an exception specification and 614/// validates compatibility and merges the specs if necessary. 615void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 616 // Shortcut if exceptions are disabled. 617 if (!getLangOpts().CXXExceptions) 618 return; 619 620 assert(Context.hasSameType(New->getType(), Old->getType()) && 621 "Should only be called if types are otherwise the same."); 622 623 QualType NewType = New->getType(); 624 QualType OldType = Old->getType(); 625 626 // We're only interested in pointers and references to functions, as well 627 // as pointers to member functions. 628 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 629 NewType = R->getPointeeType(); 630 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 631 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 632 NewType = P->getPointeeType(); 633 OldType = OldType->getAs<PointerType>()->getPointeeType(); 634 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 635 NewType = M->getPointeeType(); 636 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 637 } 638 639 if (!NewType->isFunctionProtoType()) 640 return; 641 642 // There's lots of special cases for functions. For function pointers, system 643 // libraries are hopefully not as broken so that we don't need these 644 // workarounds. 645 if (CheckEquivalentExceptionSpec( 646 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 647 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 648 New->setInvalidDecl(); 649 } 650} 651 652/// CheckCXXDefaultArguments - Verify that the default arguments for a 653/// function declaration are well-formed according to C++ 654/// [dcl.fct.default]. 655void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 656 unsigned NumParams = FD->getNumParams(); 657 unsigned p; 658 659 // Find first parameter with a default argument 660 for (p = 0; p < NumParams; ++p) { 661 ParmVarDecl *Param = FD->getParamDecl(p); 662 if (Param->hasDefaultArg()) 663 break; 664 } 665 666 // C++ [dcl.fct.default]p4: 667 // In a given function declaration, all parameters 668 // subsequent to a parameter with a default argument shall 669 // have default arguments supplied in this or previous 670 // declarations. A default argument shall not be redefined 671 // by a later declaration (not even to the same value). 672 unsigned LastMissingDefaultArg = 0; 673 for (; p < NumParams; ++p) { 674 ParmVarDecl *Param = FD->getParamDecl(p); 675 if (!Param->hasDefaultArg()) { 676 if (Param->isInvalidDecl()) 677 /* We already complained about this parameter. */; 678 else if (Param->getIdentifier()) 679 Diag(Param->getLocation(), 680 diag::err_param_default_argument_missing_name) 681 << Param->getIdentifier(); 682 else 683 Diag(Param->getLocation(), 684 diag::err_param_default_argument_missing); 685 686 LastMissingDefaultArg = p; 687 } 688 } 689 690 if (LastMissingDefaultArg > 0) { 691 // Some default arguments were missing. Clear out all of the 692 // default arguments up to (and including) the last missing 693 // default argument, so that we leave the function parameters 694 // in a semantically valid state. 695 for (p = 0; p <= LastMissingDefaultArg; ++p) { 696 ParmVarDecl *Param = FD->getParamDecl(p); 697 if (Param->hasDefaultArg()) { 698 Param->setDefaultArg(0); 699 } 700 } 701 } 702} 703 704// CheckConstexprParameterTypes - Check whether a function's parameter types 705// are all literal types. If so, return true. If not, produce a suitable 706// diagnostic and return false. 707static bool CheckConstexprParameterTypes(Sema &SemaRef, 708 const FunctionDecl *FD) { 709 unsigned ArgIndex = 0; 710 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 711 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 712 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 713 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 714 SourceLocation ParamLoc = PD->getLocation(); 715 if (!(*i)->isDependentType() && 716 SemaRef.RequireLiteralType(ParamLoc, *i, 717 diag::err_constexpr_non_literal_param, 718 ArgIndex+1, PD->getSourceRange(), 719 isa<CXXConstructorDecl>(FD))) 720 return false; 721 } 722 return true; 723} 724 725/// \brief Get diagnostic %select index for tag kind for 726/// record diagnostic message. 727/// WARNING: Indexes apply to particular diagnostics only! 728/// 729/// \returns diagnostic %select index. 730static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 731 switch (Tag) { 732 case TTK_Struct: return 0; 733 case TTK_Interface: return 1; 734 case TTK_Class: return 2; 735 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 736 } 737} 738 739// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 740// the requirements of a constexpr function definition or a constexpr 741// constructor definition. If so, return true. If not, produce appropriate 742// diagnostics and return false. 743// 744// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 745bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 746 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 747 if (MD && MD->isInstance()) { 748 // C++11 [dcl.constexpr]p4: 749 // The definition of a constexpr constructor shall satisfy the following 750 // constraints: 751 // - the class shall not have any virtual base classes; 752 const CXXRecordDecl *RD = MD->getParent(); 753 if (RD->getNumVBases()) { 754 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 755 << isa<CXXConstructorDecl>(NewFD) 756 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 757 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 758 E = RD->vbases_end(); I != E; ++I) 759 Diag(I->getLocStart(), 760 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 761 return false; 762 } 763 } 764 765 if (!isa<CXXConstructorDecl>(NewFD)) { 766 // C++11 [dcl.constexpr]p3: 767 // The definition of a constexpr function shall satisfy the following 768 // constraints: 769 // - it shall not be virtual; 770 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 771 if (Method && Method->isVirtual()) { 772 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 773 774 // If it's not obvious why this function is virtual, find an overridden 775 // function which uses the 'virtual' keyword. 776 const CXXMethodDecl *WrittenVirtual = Method; 777 while (!WrittenVirtual->isVirtualAsWritten()) 778 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 779 if (WrittenVirtual != Method) 780 Diag(WrittenVirtual->getLocation(), 781 diag::note_overridden_virtual_function); 782 return false; 783 } 784 785 // - its return type shall be a literal type; 786 QualType RT = NewFD->getResultType(); 787 if (!RT->isDependentType() && 788 RequireLiteralType(NewFD->getLocation(), RT, 789 diag::err_constexpr_non_literal_return)) 790 return false; 791 } 792 793 // - each of its parameter types shall be a literal type; 794 if (!CheckConstexprParameterTypes(*this, NewFD)) 795 return false; 796 797 return true; 798} 799 800/// Check the given declaration statement is legal within a constexpr function 801/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. 802/// 803/// \return true if the body is OK (maybe only as an extension), false if we 804/// have diagnosed a problem. 805static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 806 DeclStmt *DS, SourceLocation &Cxx1yLoc) { 807 // C++11 [dcl.constexpr]p3 and p4: 808 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 809 // contain only 810 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 811 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 812 switch ((*DclIt)->getKind()) { 813 case Decl::StaticAssert: 814 case Decl::Using: 815 case Decl::UsingShadow: 816 case Decl::UsingDirective: 817 case Decl::UnresolvedUsingTypename: 818 case Decl::UnresolvedUsingValue: 819 // - static_assert-declarations 820 // - using-declarations, 821 // - using-directives, 822 continue; 823 824 case Decl::Typedef: 825 case Decl::TypeAlias: { 826 // - typedef declarations and alias-declarations that do not define 827 // classes or enumerations, 828 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 829 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 830 // Don't allow variably-modified types in constexpr functions. 831 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 832 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 833 << TL.getSourceRange() << TL.getType() 834 << isa<CXXConstructorDecl>(Dcl); 835 return false; 836 } 837 continue; 838 } 839 840 case Decl::Enum: 841 case Decl::CXXRecord: 842 // C++1y allows types to be defined, not just declared. 843 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) 844 SemaRef.Diag(DS->getLocStart(), 845 SemaRef.getLangOpts().CPlusPlus1y 846 ? diag::warn_cxx11_compat_constexpr_type_definition 847 : diag::ext_constexpr_type_definition) 848 << isa<CXXConstructorDecl>(Dcl); 849 continue; 850 851 case Decl::EnumConstant: 852 case Decl::IndirectField: 853 case Decl::ParmVar: 854 // These can only appear with other declarations which are banned in 855 // C++11 and permitted in C++1y, so ignore them. 856 continue; 857 858 case Decl::Var: { 859 // C++1y [dcl.constexpr]p3 allows anything except: 860 // a definition of a variable of non-literal type or of static or 861 // thread storage duration or for which no initialization is performed. 862 VarDecl *VD = cast<VarDecl>(*DclIt); 863 if (VD->isThisDeclarationADefinition()) { 864 if (VD->isStaticLocal()) { 865 SemaRef.Diag(VD->getLocation(), 866 diag::err_constexpr_local_var_static) 867 << isa<CXXConstructorDecl>(Dcl) 868 << (VD->getTLSKind() == VarDecl::TLS_Dynamic); 869 return false; 870 } 871 if (!VD->getType()->isDependentType() && 872 SemaRef.RequireLiteralType( 873 VD->getLocation(), VD->getType(), 874 diag::err_constexpr_local_var_non_literal_type, 875 isa<CXXConstructorDecl>(Dcl))) 876 return false; 877 if (!VD->hasInit()) { 878 SemaRef.Diag(VD->getLocation(), 879 diag::err_constexpr_local_var_no_init) 880 << isa<CXXConstructorDecl>(Dcl); 881 return false; 882 } 883 } 884 SemaRef.Diag(VD->getLocation(), 885 SemaRef.getLangOpts().CPlusPlus1y 886 ? diag::warn_cxx11_compat_constexpr_local_var 887 : diag::ext_constexpr_local_var) 888 << isa<CXXConstructorDecl>(Dcl); 889 continue; 890 } 891 892 case Decl::NamespaceAlias: 893 case Decl::Function: 894 // These are disallowed in C++11 and permitted in C++1y. Allow them 895 // everywhere as an extension. 896 if (!Cxx1yLoc.isValid()) 897 Cxx1yLoc = DS->getLocStart(); 898 continue; 899 900 default: 901 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 902 << isa<CXXConstructorDecl>(Dcl); 903 return false; 904 } 905 } 906 907 return true; 908} 909 910/// Check that the given field is initialized within a constexpr constructor. 911/// 912/// \param Dcl The constexpr constructor being checked. 913/// \param Field The field being checked. This may be a member of an anonymous 914/// struct or union nested within the class being checked. 915/// \param Inits All declarations, including anonymous struct/union members and 916/// indirect members, for which any initialization was provided. 917/// \param Diagnosed Set to true if an error is produced. 918static void CheckConstexprCtorInitializer(Sema &SemaRef, 919 const FunctionDecl *Dcl, 920 FieldDecl *Field, 921 llvm::SmallSet<Decl*, 16> &Inits, 922 bool &Diagnosed) { 923 if (Field->isInvalidDecl()) 924 return; 925 926 if (Field->isUnnamedBitfield()) 927 return; 928 929 if (Field->isAnonymousStructOrUnion() && 930 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 931 return; 932 933 if (!Inits.count(Field)) { 934 if (!Diagnosed) { 935 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 936 Diagnosed = true; 937 } 938 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 939 } else if (Field->isAnonymousStructOrUnion()) { 940 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 941 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 942 I != E; ++I) 943 // If an anonymous union contains an anonymous struct of which any member 944 // is initialized, all members must be initialized. 945 if (!RD->isUnion() || Inits.count(*I)) 946 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 947 } 948} 949 950/// Check the provided statement is allowed in a constexpr function 951/// definition. 952static bool 953CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, 954 SmallVectorImpl<SourceLocation> &ReturnStmts, 955 SourceLocation &Cxx1yLoc) { 956 // - its function-body shall be [...] a compound-statement that contains only 957 switch (S->getStmtClass()) { 958 case Stmt::NullStmtClass: 959 // - null statements, 960 return true; 961 962 case Stmt::DeclStmtClass: 963 // - static_assert-declarations 964 // - using-declarations, 965 // - using-directives, 966 // - typedef declarations and alias-declarations that do not define 967 // classes or enumerations, 968 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) 969 return false; 970 return true; 971 972 case Stmt::ReturnStmtClass: 973 // - and exactly one return statement; 974 if (isa<CXXConstructorDecl>(Dcl)) { 975 // C++1y allows return statements in constexpr constructors. 976 if (!Cxx1yLoc.isValid()) 977 Cxx1yLoc = S->getLocStart(); 978 return true; 979 } 980 981 ReturnStmts.push_back(S->getLocStart()); 982 return true; 983 984 case Stmt::CompoundStmtClass: { 985 // C++1y allows compound-statements. 986 if (!Cxx1yLoc.isValid()) 987 Cxx1yLoc = S->getLocStart(); 988 989 CompoundStmt *CompStmt = cast<CompoundStmt>(S); 990 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(), 991 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) { 992 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts, 993 Cxx1yLoc)) 994 return false; 995 } 996 return true; 997 } 998 999 case Stmt::AttributedStmtClass: 1000 if (!Cxx1yLoc.isValid()) 1001 Cxx1yLoc = S->getLocStart(); 1002 return true; 1003 1004 case Stmt::IfStmtClass: { 1005 // C++1y allows if-statements. 1006 if (!Cxx1yLoc.isValid()) 1007 Cxx1yLoc = S->getLocStart(); 1008 1009 IfStmt *If = cast<IfStmt>(S); 1010 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, 1011 Cxx1yLoc)) 1012 return false; 1013 if (If->getElse() && 1014 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, 1015 Cxx1yLoc)) 1016 return false; 1017 return true; 1018 } 1019 1020 case Stmt::WhileStmtClass: 1021 case Stmt::DoStmtClass: 1022 case Stmt::ForStmtClass: 1023 case Stmt::CXXForRangeStmtClass: 1024 case Stmt::ContinueStmtClass: 1025 // C++1y allows all of these. We don't allow them as extensions in C++11, 1026 // because they don't make sense without variable mutation. 1027 if (!SemaRef.getLangOpts().CPlusPlus1y) 1028 break; 1029 if (!Cxx1yLoc.isValid()) 1030 Cxx1yLoc = S->getLocStart(); 1031 for (Stmt::child_range Children = S->children(); Children; ++Children) 1032 if (*Children && 1033 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1034 Cxx1yLoc)) 1035 return false; 1036 return true; 1037 1038 case Stmt::SwitchStmtClass: 1039 case Stmt::CaseStmtClass: 1040 case Stmt::DefaultStmtClass: 1041 case Stmt::BreakStmtClass: 1042 // C++1y allows switch-statements, and since they don't need variable 1043 // mutation, we can reasonably allow them in C++11 as an extension. 1044 if (!Cxx1yLoc.isValid()) 1045 Cxx1yLoc = S->getLocStart(); 1046 for (Stmt::child_range Children = S->children(); Children; ++Children) 1047 if (*Children && 1048 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1049 Cxx1yLoc)) 1050 return false; 1051 return true; 1052 1053 default: 1054 if (!isa<Expr>(S)) 1055 break; 1056 1057 // C++1y allows expression-statements. 1058 if (!Cxx1yLoc.isValid()) 1059 Cxx1yLoc = S->getLocStart(); 1060 return true; 1061 } 1062 1063 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt) 1064 << isa<CXXConstructorDecl>(Dcl); 1065 return false; 1066} 1067 1068/// Check the body for the given constexpr function declaration only contains 1069/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 1070/// 1071/// \return true if the body is OK, false if we have diagnosed a problem. 1072bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 1073 if (isa<CXXTryStmt>(Body)) { 1074 // C++11 [dcl.constexpr]p3: 1075 // The definition of a constexpr function shall satisfy the following 1076 // constraints: [...] 1077 // - its function-body shall be = delete, = default, or a 1078 // compound-statement 1079 // 1080 // C++11 [dcl.constexpr]p4: 1081 // In the definition of a constexpr constructor, [...] 1082 // - its function-body shall not be a function-try-block; 1083 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 1084 << isa<CXXConstructorDecl>(Dcl); 1085 return false; 1086 } 1087 1088 SmallVector<SourceLocation, 4> ReturnStmts; 1089 1090 // - its function-body shall be [...] a compound-statement that contains only 1091 // [... list of cases ...] 1092 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 1093 SourceLocation Cxx1yLoc; 1094 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 1095 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 1096 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc)) 1097 return false; 1098 } 1099 1100 if (Cxx1yLoc.isValid()) 1101 Diag(Cxx1yLoc, 1102 getLangOpts().CPlusPlus1y 1103 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt 1104 : diag::ext_constexpr_body_invalid_stmt) 1105 << isa<CXXConstructorDecl>(Dcl); 1106 1107 if (const CXXConstructorDecl *Constructor 1108 = dyn_cast<CXXConstructorDecl>(Dcl)) { 1109 const CXXRecordDecl *RD = Constructor->getParent(); 1110 // DR1359: 1111 // - every non-variant non-static data member and base class sub-object 1112 // shall be initialized; 1113 // - if the class is a non-empty union, or for each non-empty anonymous 1114 // union member of a non-union class, exactly one non-static data member 1115 // shall be initialized; 1116 if (RD->isUnion()) { 1117 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 1118 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 1119 return false; 1120 } 1121 } else if (!Constructor->isDependentContext() && 1122 !Constructor->isDelegatingConstructor()) { 1123 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 1124 1125 // Skip detailed checking if we have enough initializers, and we would 1126 // allow at most one initializer per member. 1127 bool AnyAnonStructUnionMembers = false; 1128 unsigned Fields = 0; 1129 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1130 E = RD->field_end(); I != E; ++I, ++Fields) { 1131 if (I->isAnonymousStructOrUnion()) { 1132 AnyAnonStructUnionMembers = true; 1133 break; 1134 } 1135 } 1136 if (AnyAnonStructUnionMembers || 1137 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 1138 // Check initialization of non-static data members. Base classes are 1139 // always initialized so do not need to be checked. Dependent bases 1140 // might not have initializers in the member initializer list. 1141 llvm::SmallSet<Decl*, 16> Inits; 1142 for (CXXConstructorDecl::init_const_iterator 1143 I = Constructor->init_begin(), E = Constructor->init_end(); 1144 I != E; ++I) { 1145 if (FieldDecl *FD = (*I)->getMember()) 1146 Inits.insert(FD); 1147 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 1148 Inits.insert(ID->chain_begin(), ID->chain_end()); 1149 } 1150 1151 bool Diagnosed = false; 1152 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1153 E = RD->field_end(); I != E; ++I) 1154 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 1155 if (Diagnosed) 1156 return false; 1157 } 1158 } 1159 } else { 1160 if (ReturnStmts.empty()) { 1161 // C++1y doesn't require constexpr functions to contain a 'return' 1162 // statement. We still do, unless the return type is void, because 1163 // otherwise if there's no return statement, the function cannot 1164 // be used in a core constant expression. 1165 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType(); 1166 Diag(Dcl->getLocation(), 1167 OK ? diag::warn_cxx11_compat_constexpr_body_no_return 1168 : diag::err_constexpr_body_no_return); 1169 return OK; 1170 } 1171 if (ReturnStmts.size() > 1) { 1172 Diag(ReturnStmts.back(), 1173 getLangOpts().CPlusPlus1y 1174 ? diag::warn_cxx11_compat_constexpr_body_multiple_return 1175 : diag::ext_constexpr_body_multiple_return); 1176 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1177 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1178 } 1179 } 1180 1181 // C++11 [dcl.constexpr]p5: 1182 // if no function argument values exist such that the function invocation 1183 // substitution would produce a constant expression, the program is 1184 // ill-formed; no diagnostic required. 1185 // C++11 [dcl.constexpr]p3: 1186 // - every constructor call and implicit conversion used in initializing the 1187 // return value shall be one of those allowed in a constant expression. 1188 // C++11 [dcl.constexpr]p4: 1189 // - every constructor involved in initializing non-static data members and 1190 // base class sub-objects shall be a constexpr constructor. 1191 SmallVector<PartialDiagnosticAt, 8> Diags; 1192 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1193 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1194 << isa<CXXConstructorDecl>(Dcl); 1195 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1196 Diag(Diags[I].first, Diags[I].second); 1197 // Don't return false here: we allow this for compatibility in 1198 // system headers. 1199 } 1200 1201 return true; 1202} 1203 1204/// isCurrentClassName - Determine whether the identifier II is the 1205/// name of the class type currently being defined. In the case of 1206/// nested classes, this will only return true if II is the name of 1207/// the innermost class. 1208bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1209 const CXXScopeSpec *SS) { 1210 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1211 1212 CXXRecordDecl *CurDecl; 1213 if (SS && SS->isSet() && !SS->isInvalid()) { 1214 DeclContext *DC = computeDeclContext(*SS, true); 1215 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1216 } else 1217 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1218 1219 if (CurDecl && CurDecl->getIdentifier()) 1220 return &II == CurDecl->getIdentifier(); 1221 return false; 1222} 1223 1224/// \brief Determine whether the given class is a base class of the given 1225/// class, including looking at dependent bases. 1226static bool findCircularInheritance(const CXXRecordDecl *Class, 1227 const CXXRecordDecl *Current) { 1228 SmallVector<const CXXRecordDecl*, 8> Queue; 1229 1230 Class = Class->getCanonicalDecl(); 1231 while (true) { 1232 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1233 E = Current->bases_end(); 1234 I != E; ++I) { 1235 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1236 if (!Base) 1237 continue; 1238 1239 Base = Base->getDefinition(); 1240 if (!Base) 1241 continue; 1242 1243 if (Base->getCanonicalDecl() == Class) 1244 return true; 1245 1246 Queue.push_back(Base); 1247 } 1248 1249 if (Queue.empty()) 1250 return false; 1251 1252 Current = Queue.back(); 1253 Queue.pop_back(); 1254 } 1255 1256 return false; 1257} 1258 1259/// \brief Check the validity of a C++ base class specifier. 1260/// 1261/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1262/// and returns NULL otherwise. 1263CXXBaseSpecifier * 1264Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1265 SourceRange SpecifierRange, 1266 bool Virtual, AccessSpecifier Access, 1267 TypeSourceInfo *TInfo, 1268 SourceLocation EllipsisLoc) { 1269 QualType BaseType = TInfo->getType(); 1270 1271 // C++ [class.union]p1: 1272 // A union shall not have base classes. 1273 if (Class->isUnion()) { 1274 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1275 << SpecifierRange; 1276 return 0; 1277 } 1278 1279 if (EllipsisLoc.isValid() && 1280 !TInfo->getType()->containsUnexpandedParameterPack()) { 1281 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1282 << TInfo->getTypeLoc().getSourceRange(); 1283 EllipsisLoc = SourceLocation(); 1284 } 1285 1286 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1287 1288 if (BaseType->isDependentType()) { 1289 // Make sure that we don't have circular inheritance among our dependent 1290 // bases. For non-dependent bases, the check for completeness below handles 1291 // this. 1292 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1293 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1294 ((BaseDecl = BaseDecl->getDefinition()) && 1295 findCircularInheritance(Class, BaseDecl))) { 1296 Diag(BaseLoc, diag::err_circular_inheritance) 1297 << BaseType << Context.getTypeDeclType(Class); 1298 1299 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1300 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1301 << BaseType; 1302 1303 return 0; 1304 } 1305 } 1306 1307 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1308 Class->getTagKind() == TTK_Class, 1309 Access, TInfo, EllipsisLoc); 1310 } 1311 1312 // Base specifiers must be record types. 1313 if (!BaseType->isRecordType()) { 1314 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1315 return 0; 1316 } 1317 1318 // C++ [class.union]p1: 1319 // A union shall not be used as a base class. 1320 if (BaseType->isUnionType()) { 1321 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1322 return 0; 1323 } 1324 1325 // C++ [class.derived]p2: 1326 // The class-name in a base-specifier shall not be an incompletely 1327 // defined class. 1328 if (RequireCompleteType(BaseLoc, BaseType, 1329 diag::err_incomplete_base_class, SpecifierRange)) { 1330 Class->setInvalidDecl(); 1331 return 0; 1332 } 1333 1334 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1335 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1336 assert(BaseDecl && "Record type has no declaration"); 1337 BaseDecl = BaseDecl->getDefinition(); 1338 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1339 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1340 assert(CXXBaseDecl && "Base type is not a C++ type"); 1341 1342 // C++ [class]p3: 1343 // If a class is marked final and it appears as a base-type-specifier in 1344 // base-clause, the program is ill-formed. 1345 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1346 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1347 << CXXBaseDecl->getDeclName(); 1348 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1349 << CXXBaseDecl->getDeclName(); 1350 return 0; 1351 } 1352 1353 if (BaseDecl->isInvalidDecl()) 1354 Class->setInvalidDecl(); 1355 1356 // Create the base specifier. 1357 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1358 Class->getTagKind() == TTK_Class, 1359 Access, TInfo, EllipsisLoc); 1360} 1361 1362/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1363/// one entry in the base class list of a class specifier, for 1364/// example: 1365/// class foo : public bar, virtual private baz { 1366/// 'public bar' and 'virtual private baz' are each base-specifiers. 1367BaseResult 1368Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1369 ParsedAttributes &Attributes, 1370 bool Virtual, AccessSpecifier Access, 1371 ParsedType basetype, SourceLocation BaseLoc, 1372 SourceLocation EllipsisLoc) { 1373 if (!classdecl) 1374 return true; 1375 1376 AdjustDeclIfTemplate(classdecl); 1377 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1378 if (!Class) 1379 return true; 1380 1381 // We do not support any C++11 attributes on base-specifiers yet. 1382 // Diagnose any attributes we see. 1383 if (!Attributes.empty()) { 1384 for (AttributeList *Attr = Attributes.getList(); Attr; 1385 Attr = Attr->getNext()) { 1386 if (Attr->isInvalid() || 1387 Attr->getKind() == AttributeList::IgnoredAttribute) 1388 continue; 1389 Diag(Attr->getLoc(), 1390 Attr->getKind() == AttributeList::UnknownAttribute 1391 ? diag::warn_unknown_attribute_ignored 1392 : diag::err_base_specifier_attribute) 1393 << Attr->getName(); 1394 } 1395 } 1396 1397 TypeSourceInfo *TInfo = 0; 1398 GetTypeFromParser(basetype, &TInfo); 1399 1400 if (EllipsisLoc.isInvalid() && 1401 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1402 UPPC_BaseType)) 1403 return true; 1404 1405 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1406 Virtual, Access, TInfo, 1407 EllipsisLoc)) 1408 return BaseSpec; 1409 else 1410 Class->setInvalidDecl(); 1411 1412 return true; 1413} 1414 1415/// \brief Performs the actual work of attaching the given base class 1416/// specifiers to a C++ class. 1417bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1418 unsigned NumBases) { 1419 if (NumBases == 0) 1420 return false; 1421 1422 // Used to keep track of which base types we have already seen, so 1423 // that we can properly diagnose redundant direct base types. Note 1424 // that the key is always the unqualified canonical type of the base 1425 // class. 1426 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1427 1428 // Copy non-redundant base specifiers into permanent storage. 1429 unsigned NumGoodBases = 0; 1430 bool Invalid = false; 1431 for (unsigned idx = 0; idx < NumBases; ++idx) { 1432 QualType NewBaseType 1433 = Context.getCanonicalType(Bases[idx]->getType()); 1434 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1435 1436 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1437 if (KnownBase) { 1438 // C++ [class.mi]p3: 1439 // A class shall not be specified as a direct base class of a 1440 // derived class more than once. 1441 Diag(Bases[idx]->getLocStart(), 1442 diag::err_duplicate_base_class) 1443 << KnownBase->getType() 1444 << Bases[idx]->getSourceRange(); 1445 1446 // Delete the duplicate base class specifier; we're going to 1447 // overwrite its pointer later. 1448 Context.Deallocate(Bases[idx]); 1449 1450 Invalid = true; 1451 } else { 1452 // Okay, add this new base class. 1453 KnownBase = Bases[idx]; 1454 Bases[NumGoodBases++] = Bases[idx]; 1455 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1456 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1457 if (Class->isInterface() && 1458 (!RD->isInterface() || 1459 KnownBase->getAccessSpecifier() != AS_public)) { 1460 // The Microsoft extension __interface does not permit bases that 1461 // are not themselves public interfaces. 1462 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1463 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1464 << RD->getSourceRange(); 1465 Invalid = true; 1466 } 1467 if (RD->hasAttr<WeakAttr>()) 1468 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1469 } 1470 } 1471 } 1472 1473 // Attach the remaining base class specifiers to the derived class. 1474 Class->setBases(Bases, NumGoodBases); 1475 1476 // Delete the remaining (good) base class specifiers, since their 1477 // data has been copied into the CXXRecordDecl. 1478 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1479 Context.Deallocate(Bases[idx]); 1480 1481 return Invalid; 1482} 1483 1484/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1485/// class, after checking whether there are any duplicate base 1486/// classes. 1487void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1488 unsigned NumBases) { 1489 if (!ClassDecl || !Bases || !NumBases) 1490 return; 1491 1492 AdjustDeclIfTemplate(ClassDecl); 1493 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases, NumBases); 1494} 1495 1496/// \brief Determine whether the type \p Derived is a C++ class that is 1497/// derived from the type \p Base. 1498bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1499 if (!getLangOpts().CPlusPlus) 1500 return false; 1501 1502 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1503 if (!DerivedRD) 1504 return false; 1505 1506 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1507 if (!BaseRD) 1508 return false; 1509 1510 // If either the base or the derived type is invalid, don't try to 1511 // check whether one is derived from the other. 1512 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1513 return false; 1514 1515 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1516 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1517} 1518 1519/// \brief Determine whether the type \p Derived is a C++ class that is 1520/// derived from the type \p Base. 1521bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1522 if (!getLangOpts().CPlusPlus) 1523 return false; 1524 1525 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1526 if (!DerivedRD) 1527 return false; 1528 1529 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1530 if (!BaseRD) 1531 return false; 1532 1533 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1534} 1535 1536void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1537 CXXCastPath &BasePathArray) { 1538 assert(BasePathArray.empty() && "Base path array must be empty!"); 1539 assert(Paths.isRecordingPaths() && "Must record paths!"); 1540 1541 const CXXBasePath &Path = Paths.front(); 1542 1543 // We first go backward and check if we have a virtual base. 1544 // FIXME: It would be better if CXXBasePath had the base specifier for 1545 // the nearest virtual base. 1546 unsigned Start = 0; 1547 for (unsigned I = Path.size(); I != 0; --I) { 1548 if (Path[I - 1].Base->isVirtual()) { 1549 Start = I - 1; 1550 break; 1551 } 1552 } 1553 1554 // Now add all bases. 1555 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1556 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1557} 1558 1559/// \brief Determine whether the given base path includes a virtual 1560/// base class. 1561bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1562 for (CXXCastPath::const_iterator B = BasePath.begin(), 1563 BEnd = BasePath.end(); 1564 B != BEnd; ++B) 1565 if ((*B)->isVirtual()) 1566 return true; 1567 1568 return false; 1569} 1570 1571/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1572/// conversion (where Derived and Base are class types) is 1573/// well-formed, meaning that the conversion is unambiguous (and 1574/// that all of the base classes are accessible). Returns true 1575/// and emits a diagnostic if the code is ill-formed, returns false 1576/// otherwise. Loc is the location where this routine should point to 1577/// if there is an error, and Range is the source range to highlight 1578/// if there is an error. 1579bool 1580Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1581 unsigned InaccessibleBaseID, 1582 unsigned AmbigiousBaseConvID, 1583 SourceLocation Loc, SourceRange Range, 1584 DeclarationName Name, 1585 CXXCastPath *BasePath) { 1586 // First, determine whether the path from Derived to Base is 1587 // ambiguous. This is slightly more expensive than checking whether 1588 // the Derived to Base conversion exists, because here we need to 1589 // explore multiple paths to determine if there is an ambiguity. 1590 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1591 /*DetectVirtual=*/false); 1592 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1593 assert(DerivationOkay && 1594 "Can only be used with a derived-to-base conversion"); 1595 (void)DerivationOkay; 1596 1597 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1598 if (InaccessibleBaseID) { 1599 // Check that the base class can be accessed. 1600 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1601 InaccessibleBaseID)) { 1602 case AR_inaccessible: 1603 return true; 1604 case AR_accessible: 1605 case AR_dependent: 1606 case AR_delayed: 1607 break; 1608 } 1609 } 1610 1611 // Build a base path if necessary. 1612 if (BasePath) 1613 BuildBasePathArray(Paths, *BasePath); 1614 return false; 1615 } 1616 1617 if (AmbigiousBaseConvID) { 1618 // We know that the derived-to-base conversion is ambiguous, and 1619 // we're going to produce a diagnostic. Perform the derived-to-base 1620 // search just one more time to compute all of the possible paths so 1621 // that we can print them out. This is more expensive than any of 1622 // the previous derived-to-base checks we've done, but at this point 1623 // performance isn't as much of an issue. 1624 Paths.clear(); 1625 Paths.setRecordingPaths(true); 1626 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1627 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1628 (void)StillOkay; 1629 1630 // Build up a textual representation of the ambiguous paths, e.g., 1631 // D -> B -> A, that will be used to illustrate the ambiguous 1632 // conversions in the diagnostic. We only print one of the paths 1633 // to each base class subobject. 1634 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1635 1636 Diag(Loc, AmbigiousBaseConvID) 1637 << Derived << Base << PathDisplayStr << Range << Name; 1638 } 1639 return true; 1640} 1641 1642bool 1643Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1644 SourceLocation Loc, SourceRange Range, 1645 CXXCastPath *BasePath, 1646 bool IgnoreAccess) { 1647 return CheckDerivedToBaseConversion(Derived, Base, 1648 IgnoreAccess ? 0 1649 : diag::err_upcast_to_inaccessible_base, 1650 diag::err_ambiguous_derived_to_base_conv, 1651 Loc, Range, DeclarationName(), 1652 BasePath); 1653} 1654 1655 1656/// @brief Builds a string representing ambiguous paths from a 1657/// specific derived class to different subobjects of the same base 1658/// class. 1659/// 1660/// This function builds a string that can be used in error messages 1661/// to show the different paths that one can take through the 1662/// inheritance hierarchy to go from the derived class to different 1663/// subobjects of a base class. The result looks something like this: 1664/// @code 1665/// struct D -> struct B -> struct A 1666/// struct D -> struct C -> struct A 1667/// @endcode 1668std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1669 std::string PathDisplayStr; 1670 std::set<unsigned> DisplayedPaths; 1671 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1672 Path != Paths.end(); ++Path) { 1673 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1674 // We haven't displayed a path to this particular base 1675 // class subobject yet. 1676 PathDisplayStr += "\n "; 1677 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1678 for (CXXBasePath::const_iterator Element = Path->begin(); 1679 Element != Path->end(); ++Element) 1680 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1681 } 1682 } 1683 1684 return PathDisplayStr; 1685} 1686 1687//===----------------------------------------------------------------------===// 1688// C++ class member Handling 1689//===----------------------------------------------------------------------===// 1690 1691/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1692bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1693 SourceLocation ASLoc, 1694 SourceLocation ColonLoc, 1695 AttributeList *Attrs) { 1696 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1697 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1698 ASLoc, ColonLoc); 1699 CurContext->addHiddenDecl(ASDecl); 1700 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1701} 1702 1703/// CheckOverrideControl - Check C++11 override control semantics. 1704void Sema::CheckOverrideControl(Decl *D) { 1705 if (D->isInvalidDecl()) 1706 return; 1707 1708 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1709 1710 // Do we know which functions this declaration might be overriding? 1711 bool OverridesAreKnown = !MD || 1712 (!MD->getParent()->hasAnyDependentBases() && 1713 !MD->getType()->isDependentType()); 1714 1715 if (!MD || !MD->isVirtual()) { 1716 if (OverridesAreKnown) { 1717 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1718 Diag(OA->getLocation(), 1719 diag::override_keyword_only_allowed_on_virtual_member_functions) 1720 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1721 D->dropAttr<OverrideAttr>(); 1722 } 1723 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1724 Diag(FA->getLocation(), 1725 diag::override_keyword_only_allowed_on_virtual_member_functions) 1726 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1727 D->dropAttr<FinalAttr>(); 1728 } 1729 } 1730 return; 1731 } 1732 1733 if (!OverridesAreKnown) 1734 return; 1735 1736 // C++11 [class.virtual]p5: 1737 // If a virtual function is marked with the virt-specifier override and 1738 // does not override a member function of a base class, the program is 1739 // ill-formed. 1740 bool HasOverriddenMethods = 1741 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1742 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1743 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1744 << MD->getDeclName(); 1745} 1746 1747/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1748/// function overrides a virtual member function marked 'final', according to 1749/// C++11 [class.virtual]p4. 1750bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1751 const CXXMethodDecl *Old) { 1752 if (!Old->hasAttr<FinalAttr>()) 1753 return false; 1754 1755 Diag(New->getLocation(), diag::err_final_function_overridden) 1756 << New->getDeclName(); 1757 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1758 return true; 1759} 1760 1761static bool InitializationHasSideEffects(const FieldDecl &FD) { 1762 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1763 // FIXME: Destruction of ObjC lifetime types has side-effects. 1764 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1765 return !RD->isCompleteDefinition() || 1766 !RD->hasTrivialDefaultConstructor() || 1767 !RD->hasTrivialDestructor(); 1768 return false; 1769} 1770 1771static AttributeList *getMSPropertyAttr(AttributeList *list) { 1772 for (AttributeList* it = list; it != 0; it = it->getNext()) 1773 if (it->isDeclspecPropertyAttribute()) 1774 return it; 1775 return 0; 1776} 1777 1778/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1779/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1780/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1781/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1782/// present (but parsing it has been deferred). 1783NamedDecl * 1784Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1785 MultiTemplateParamsArg TemplateParameterLists, 1786 Expr *BW, const VirtSpecifiers &VS, 1787 InClassInitStyle InitStyle) { 1788 const DeclSpec &DS = D.getDeclSpec(); 1789 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1790 DeclarationName Name = NameInfo.getName(); 1791 SourceLocation Loc = NameInfo.getLoc(); 1792 1793 // For anonymous bitfields, the location should point to the type. 1794 if (Loc.isInvalid()) 1795 Loc = D.getLocStart(); 1796 1797 Expr *BitWidth = static_cast<Expr*>(BW); 1798 1799 assert(isa<CXXRecordDecl>(CurContext)); 1800 assert(!DS.isFriendSpecified()); 1801 1802 bool isFunc = D.isDeclarationOfFunction(); 1803 1804 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1805 // The Microsoft extension __interface only permits public member functions 1806 // and prohibits constructors, destructors, operators, non-public member 1807 // functions, static methods and data members. 1808 unsigned InvalidDecl; 1809 bool ShowDeclName = true; 1810 if (!isFunc) 1811 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1812 else if (AS != AS_public) 1813 InvalidDecl = 2; 1814 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1815 InvalidDecl = 3; 1816 else switch (Name.getNameKind()) { 1817 case DeclarationName::CXXConstructorName: 1818 InvalidDecl = 4; 1819 ShowDeclName = false; 1820 break; 1821 1822 case DeclarationName::CXXDestructorName: 1823 InvalidDecl = 5; 1824 ShowDeclName = false; 1825 break; 1826 1827 case DeclarationName::CXXOperatorName: 1828 case DeclarationName::CXXConversionFunctionName: 1829 InvalidDecl = 6; 1830 break; 1831 1832 default: 1833 InvalidDecl = 0; 1834 break; 1835 } 1836 1837 if (InvalidDecl) { 1838 if (ShowDeclName) 1839 Diag(Loc, diag::err_invalid_member_in_interface) 1840 << (InvalidDecl-1) << Name; 1841 else 1842 Diag(Loc, diag::err_invalid_member_in_interface) 1843 << (InvalidDecl-1) << ""; 1844 return 0; 1845 } 1846 } 1847 1848 // C++ 9.2p6: A member shall not be declared to have automatic storage 1849 // duration (auto, register) or with the extern storage-class-specifier. 1850 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1851 // data members and cannot be applied to names declared const or static, 1852 // and cannot be applied to reference members. 1853 switch (DS.getStorageClassSpec()) { 1854 case DeclSpec::SCS_unspecified: 1855 case DeclSpec::SCS_typedef: 1856 case DeclSpec::SCS_static: 1857 break; 1858 case DeclSpec::SCS_mutable: 1859 if (isFunc) { 1860 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1861 1862 // FIXME: It would be nicer if the keyword was ignored only for this 1863 // declarator. Otherwise we could get follow-up errors. 1864 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1865 } 1866 break; 1867 default: 1868 Diag(DS.getStorageClassSpecLoc(), 1869 diag::err_storageclass_invalid_for_member); 1870 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1871 break; 1872 } 1873 1874 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1875 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1876 !isFunc); 1877 1878 if (DS.isConstexprSpecified() && isInstField) { 1879 SemaDiagnosticBuilder B = 1880 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1881 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1882 if (InitStyle == ICIS_NoInit) { 1883 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1884 D.getMutableDeclSpec().ClearConstexprSpec(); 1885 const char *PrevSpec; 1886 unsigned DiagID; 1887 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1888 PrevSpec, DiagID, getLangOpts()); 1889 (void)Failed; 1890 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1891 } else { 1892 B << 1; 1893 const char *PrevSpec; 1894 unsigned DiagID; 1895 if (D.getMutableDeclSpec().SetStorageClassSpec( 1896 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1897 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1898 "This is the only DeclSpec that should fail to be applied"); 1899 B << 1; 1900 } else { 1901 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1902 isInstField = false; 1903 } 1904 } 1905 } 1906 1907 NamedDecl *Member; 1908 if (isInstField) { 1909 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1910 1911 // Data members must have identifiers for names. 1912 if (!Name.isIdentifier()) { 1913 Diag(Loc, diag::err_bad_variable_name) 1914 << Name; 1915 return 0; 1916 } 1917 1918 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1919 1920 // Member field could not be with "template" keyword. 1921 // So TemplateParameterLists should be empty in this case. 1922 if (TemplateParameterLists.size()) { 1923 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1924 if (TemplateParams->size()) { 1925 // There is no such thing as a member field template. 1926 Diag(D.getIdentifierLoc(), diag::err_template_member) 1927 << II 1928 << SourceRange(TemplateParams->getTemplateLoc(), 1929 TemplateParams->getRAngleLoc()); 1930 } else { 1931 // There is an extraneous 'template<>' for this member. 1932 Diag(TemplateParams->getTemplateLoc(), 1933 diag::err_template_member_noparams) 1934 << II 1935 << SourceRange(TemplateParams->getTemplateLoc(), 1936 TemplateParams->getRAngleLoc()); 1937 } 1938 return 0; 1939 } 1940 1941 if (SS.isSet() && !SS.isInvalid()) { 1942 // The user provided a superfluous scope specifier inside a class 1943 // definition: 1944 // 1945 // class X { 1946 // int X::member; 1947 // }; 1948 if (DeclContext *DC = computeDeclContext(SS, false)) 1949 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1950 else 1951 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1952 << Name << SS.getRange(); 1953 1954 SS.clear(); 1955 } 1956 1957 AttributeList *MSPropertyAttr = 1958 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1959 if (MSPropertyAttr) { 1960 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1961 BitWidth, InitStyle, AS, MSPropertyAttr); 1962 if (!Member) 1963 return 0; 1964 isInstField = false; 1965 } else { 1966 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1967 BitWidth, InitStyle, AS); 1968 assert(Member && "HandleField never returns null"); 1969 } 1970 } else { 1971 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1972 1973 Member = HandleDeclarator(S, D, TemplateParameterLists); 1974 if (!Member) 1975 return 0; 1976 1977 // Non-instance-fields can't have a bitfield. 1978 if (BitWidth) { 1979 if (Member->isInvalidDecl()) { 1980 // don't emit another diagnostic. 1981 } else if (isa<VarDecl>(Member)) { 1982 // C++ 9.6p3: A bit-field shall not be a static member. 1983 // "static member 'A' cannot be a bit-field" 1984 Diag(Loc, diag::err_static_not_bitfield) 1985 << Name << BitWidth->getSourceRange(); 1986 } else if (isa<TypedefDecl>(Member)) { 1987 // "typedef member 'x' cannot be a bit-field" 1988 Diag(Loc, diag::err_typedef_not_bitfield) 1989 << Name << BitWidth->getSourceRange(); 1990 } else { 1991 // A function typedef ("typedef int f(); f a;"). 1992 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1993 Diag(Loc, diag::err_not_integral_type_bitfield) 1994 << Name << cast<ValueDecl>(Member)->getType() 1995 << BitWidth->getSourceRange(); 1996 } 1997 1998 BitWidth = 0; 1999 Member->setInvalidDecl(); 2000 } 2001 2002 Member->setAccess(AS); 2003 2004 // If we have declared a member function template or static data member 2005 // template, set the access of the templated declaration as well. 2006 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 2007 FunTmpl->getTemplatedDecl()->setAccess(AS); 2008 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) 2009 VarTmpl->getTemplatedDecl()->setAccess(AS); 2010 } 2011 2012 if (VS.isOverrideSpecified()) 2013 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 2014 if (VS.isFinalSpecified()) 2015 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 2016 2017 if (VS.getLastLocation().isValid()) { 2018 // Update the end location of a method that has a virt-specifiers. 2019 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 2020 MD->setRangeEnd(VS.getLastLocation()); 2021 } 2022 2023 CheckOverrideControl(Member); 2024 2025 assert((Name || isInstField) && "No identifier for non-field ?"); 2026 2027 if (isInstField) { 2028 FieldDecl *FD = cast<FieldDecl>(Member); 2029 FieldCollector->Add(FD); 2030 2031 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2032 FD->getLocation()) 2033 != DiagnosticsEngine::Ignored) { 2034 // Remember all explicit private FieldDecls that have a name, no side 2035 // effects and are not part of a dependent type declaration. 2036 if (!FD->isImplicit() && FD->getDeclName() && 2037 FD->getAccess() == AS_private && 2038 !FD->hasAttr<UnusedAttr>() && 2039 !FD->getParent()->isDependentContext() && 2040 !InitializationHasSideEffects(*FD)) 2041 UnusedPrivateFields.insert(FD); 2042 } 2043 } 2044 2045 return Member; 2046} 2047 2048namespace { 2049 class UninitializedFieldVisitor 2050 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2051 Sema &S; 2052 ValueDecl *VD; 2053 public: 2054 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2055 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2056 S(S) { 2057 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2058 this->VD = IFD->getAnonField(); 2059 else 2060 this->VD = VD; 2061 } 2062 2063 void HandleExpr(Expr *E) { 2064 if (!E) return; 2065 2066 // Expressions like x(x) sometimes lack the surrounding expressions 2067 // but need to be checked anyways. 2068 HandleValue(E); 2069 Visit(E); 2070 } 2071 2072 void HandleValue(Expr *E) { 2073 E = E->IgnoreParens(); 2074 2075 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2076 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2077 return; 2078 2079 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2080 // or union. 2081 MemberExpr *FieldME = ME; 2082 2083 Expr *Base = E; 2084 while (isa<MemberExpr>(Base)) { 2085 ME = cast<MemberExpr>(Base); 2086 2087 if (isa<VarDecl>(ME->getMemberDecl())) 2088 return; 2089 2090 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2091 if (!FD->isAnonymousStructOrUnion()) 2092 FieldME = ME; 2093 2094 Base = ME->getBase(); 2095 } 2096 2097 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2098 unsigned diag = VD->getType()->isReferenceType() 2099 ? diag::warn_reference_field_is_uninit 2100 : diag::warn_field_is_uninit; 2101 S.Diag(FieldME->getExprLoc(), diag) << VD; 2102 } 2103 return; 2104 } 2105 2106 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2107 HandleValue(CO->getTrueExpr()); 2108 HandleValue(CO->getFalseExpr()); 2109 return; 2110 } 2111 2112 if (BinaryConditionalOperator *BCO = 2113 dyn_cast<BinaryConditionalOperator>(E)) { 2114 HandleValue(BCO->getCommon()); 2115 HandleValue(BCO->getFalseExpr()); 2116 return; 2117 } 2118 2119 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2120 switch (BO->getOpcode()) { 2121 default: 2122 return; 2123 case(BO_PtrMemD): 2124 case(BO_PtrMemI): 2125 HandleValue(BO->getLHS()); 2126 return; 2127 case(BO_Comma): 2128 HandleValue(BO->getRHS()); 2129 return; 2130 } 2131 } 2132 } 2133 2134 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2135 if (E->getCastKind() == CK_LValueToRValue) 2136 HandleValue(E->getSubExpr()); 2137 2138 Inherited::VisitImplicitCastExpr(E); 2139 } 2140 2141 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2142 Expr *Callee = E->getCallee(); 2143 if (isa<MemberExpr>(Callee)) 2144 HandleValue(Callee); 2145 2146 Inherited::VisitCXXMemberCallExpr(E); 2147 } 2148 }; 2149 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2150 ValueDecl *VD) { 2151 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2152 } 2153} // namespace 2154 2155/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2156/// in-class initializer for a non-static C++ class member, and after 2157/// instantiating an in-class initializer in a class template. Such actions 2158/// are deferred until the class is complete. 2159void 2160Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2161 Expr *InitExpr) { 2162 FieldDecl *FD = cast<FieldDecl>(D); 2163 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2164 "must set init style when field is created"); 2165 2166 if (!InitExpr) { 2167 FD->setInvalidDecl(); 2168 FD->removeInClassInitializer(); 2169 return; 2170 } 2171 2172 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2173 FD->setInvalidDecl(); 2174 FD->removeInClassInitializer(); 2175 return; 2176 } 2177 2178 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2179 != DiagnosticsEngine::Ignored) { 2180 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2181 } 2182 2183 ExprResult Init = InitExpr; 2184 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2185 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2186 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2187 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2188 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2189 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2190 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2191 if (Init.isInvalid()) { 2192 FD->setInvalidDecl(); 2193 return; 2194 } 2195 } 2196 2197 // C++11 [class.base.init]p7: 2198 // The initialization of each base and member constitutes a 2199 // full-expression. 2200 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2201 if (Init.isInvalid()) { 2202 FD->setInvalidDecl(); 2203 return; 2204 } 2205 2206 InitExpr = Init.release(); 2207 2208 FD->setInClassInitializer(InitExpr); 2209} 2210 2211/// \brief Find the direct and/or virtual base specifiers that 2212/// correspond to the given base type, for use in base initialization 2213/// within a constructor. 2214static bool FindBaseInitializer(Sema &SemaRef, 2215 CXXRecordDecl *ClassDecl, 2216 QualType BaseType, 2217 const CXXBaseSpecifier *&DirectBaseSpec, 2218 const CXXBaseSpecifier *&VirtualBaseSpec) { 2219 // First, check for a direct base class. 2220 DirectBaseSpec = 0; 2221 for (CXXRecordDecl::base_class_const_iterator Base 2222 = ClassDecl->bases_begin(); 2223 Base != ClassDecl->bases_end(); ++Base) { 2224 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2225 // We found a direct base of this type. That's what we're 2226 // initializing. 2227 DirectBaseSpec = &*Base; 2228 break; 2229 } 2230 } 2231 2232 // Check for a virtual base class. 2233 // FIXME: We might be able to short-circuit this if we know in advance that 2234 // there are no virtual bases. 2235 VirtualBaseSpec = 0; 2236 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2237 // We haven't found a base yet; search the class hierarchy for a 2238 // virtual base class. 2239 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2240 /*DetectVirtual=*/false); 2241 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2242 BaseType, Paths)) { 2243 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2244 Path != Paths.end(); ++Path) { 2245 if (Path->back().Base->isVirtual()) { 2246 VirtualBaseSpec = Path->back().Base; 2247 break; 2248 } 2249 } 2250 } 2251 } 2252 2253 return DirectBaseSpec || VirtualBaseSpec; 2254} 2255 2256/// \brief Handle a C++ member initializer using braced-init-list syntax. 2257MemInitResult 2258Sema::ActOnMemInitializer(Decl *ConstructorD, 2259 Scope *S, 2260 CXXScopeSpec &SS, 2261 IdentifierInfo *MemberOrBase, 2262 ParsedType TemplateTypeTy, 2263 const DeclSpec &DS, 2264 SourceLocation IdLoc, 2265 Expr *InitList, 2266 SourceLocation EllipsisLoc) { 2267 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2268 DS, IdLoc, InitList, 2269 EllipsisLoc); 2270} 2271 2272/// \brief Handle a C++ member initializer using parentheses syntax. 2273MemInitResult 2274Sema::ActOnMemInitializer(Decl *ConstructorD, 2275 Scope *S, 2276 CXXScopeSpec &SS, 2277 IdentifierInfo *MemberOrBase, 2278 ParsedType TemplateTypeTy, 2279 const DeclSpec &DS, 2280 SourceLocation IdLoc, 2281 SourceLocation LParenLoc, 2282 ArrayRef<Expr *> Args, 2283 SourceLocation RParenLoc, 2284 SourceLocation EllipsisLoc) { 2285 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2286 Args, RParenLoc); 2287 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2288 DS, IdLoc, List, EllipsisLoc); 2289} 2290 2291namespace { 2292 2293// Callback to only accept typo corrections that can be a valid C++ member 2294// intializer: either a non-static field member or a base class. 2295class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2296public: 2297 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2298 : ClassDecl(ClassDecl) {} 2299 2300 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 2301 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2302 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2303 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2304 return isa<TypeDecl>(ND); 2305 } 2306 return false; 2307 } 2308 2309private: 2310 CXXRecordDecl *ClassDecl; 2311}; 2312 2313} 2314 2315/// \brief Handle a C++ member initializer. 2316MemInitResult 2317Sema::BuildMemInitializer(Decl *ConstructorD, 2318 Scope *S, 2319 CXXScopeSpec &SS, 2320 IdentifierInfo *MemberOrBase, 2321 ParsedType TemplateTypeTy, 2322 const DeclSpec &DS, 2323 SourceLocation IdLoc, 2324 Expr *Init, 2325 SourceLocation EllipsisLoc) { 2326 if (!ConstructorD) 2327 return true; 2328 2329 AdjustDeclIfTemplate(ConstructorD); 2330 2331 CXXConstructorDecl *Constructor 2332 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2333 if (!Constructor) { 2334 // The user wrote a constructor initializer on a function that is 2335 // not a C++ constructor. Ignore the error for now, because we may 2336 // have more member initializers coming; we'll diagnose it just 2337 // once in ActOnMemInitializers. 2338 return true; 2339 } 2340 2341 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2342 2343 // C++ [class.base.init]p2: 2344 // Names in a mem-initializer-id are looked up in the scope of the 2345 // constructor's class and, if not found in that scope, are looked 2346 // up in the scope containing the constructor's definition. 2347 // [Note: if the constructor's class contains a member with the 2348 // same name as a direct or virtual base class of the class, a 2349 // mem-initializer-id naming the member or base class and composed 2350 // of a single identifier refers to the class member. A 2351 // mem-initializer-id for the hidden base class may be specified 2352 // using a qualified name. ] 2353 if (!SS.getScopeRep() && !TemplateTypeTy) { 2354 // Look for a member, first. 2355 DeclContext::lookup_result Result 2356 = ClassDecl->lookup(MemberOrBase); 2357 if (!Result.empty()) { 2358 ValueDecl *Member; 2359 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2360 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2361 if (EllipsisLoc.isValid()) 2362 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2363 << MemberOrBase 2364 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2365 2366 return BuildMemberInitializer(Member, Init, IdLoc); 2367 } 2368 } 2369 } 2370 // It didn't name a member, so see if it names a class. 2371 QualType BaseType; 2372 TypeSourceInfo *TInfo = 0; 2373 2374 if (TemplateTypeTy) { 2375 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2376 } else if (DS.getTypeSpecType() == TST_decltype) { 2377 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2378 } else { 2379 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2380 LookupParsedName(R, S, &SS); 2381 2382 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2383 if (!TyD) { 2384 if (R.isAmbiguous()) return true; 2385 2386 // We don't want access-control diagnostics here. 2387 R.suppressDiagnostics(); 2388 2389 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2390 bool NotUnknownSpecialization = false; 2391 DeclContext *DC = computeDeclContext(SS, false); 2392 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2393 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2394 2395 if (!NotUnknownSpecialization) { 2396 // When the scope specifier can refer to a member of an unknown 2397 // specialization, we take it as a type name. 2398 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2399 SS.getWithLocInContext(Context), 2400 *MemberOrBase, IdLoc); 2401 if (BaseType.isNull()) 2402 return true; 2403 2404 R.clear(); 2405 R.setLookupName(MemberOrBase); 2406 } 2407 } 2408 2409 // If no results were found, try to correct typos. 2410 TypoCorrection Corr; 2411 MemInitializerValidatorCCC Validator(ClassDecl); 2412 if (R.empty() && BaseType.isNull() && 2413 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2414 Validator, ClassDecl))) { 2415 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2416 // We have found a non-static data member with a similar 2417 // name to what was typed; complain and initialize that 2418 // member. 2419 diagnoseTypo(Corr, 2420 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2421 << MemberOrBase << true); 2422 return BuildMemberInitializer(Member, Init, IdLoc); 2423 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2424 const CXXBaseSpecifier *DirectBaseSpec; 2425 const CXXBaseSpecifier *VirtualBaseSpec; 2426 if (FindBaseInitializer(*this, ClassDecl, 2427 Context.getTypeDeclType(Type), 2428 DirectBaseSpec, VirtualBaseSpec)) { 2429 // We have found a direct or virtual base class with a 2430 // similar name to what was typed; complain and initialize 2431 // that base class. 2432 diagnoseTypo(Corr, 2433 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2434 << MemberOrBase << false, 2435 PDiag() /*Suppress note, we provide our own.*/); 2436 2437 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec 2438 : VirtualBaseSpec; 2439 Diag(BaseSpec->getLocStart(), 2440 diag::note_base_class_specified_here) 2441 << BaseSpec->getType() 2442 << BaseSpec->getSourceRange(); 2443 2444 TyD = Type; 2445 } 2446 } 2447 } 2448 2449 if (!TyD && BaseType.isNull()) { 2450 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2451 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2452 return true; 2453 } 2454 } 2455 2456 if (BaseType.isNull()) { 2457 BaseType = Context.getTypeDeclType(TyD); 2458 if (SS.isSet()) { 2459 NestedNameSpecifier *Qualifier = 2460 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2461 2462 // FIXME: preserve source range information 2463 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2464 } 2465 } 2466 } 2467 2468 if (!TInfo) 2469 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2470 2471 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2472} 2473 2474/// Checks a member initializer expression for cases where reference (or 2475/// pointer) members are bound to by-value parameters (or their addresses). 2476static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2477 Expr *Init, 2478 SourceLocation IdLoc) { 2479 QualType MemberTy = Member->getType(); 2480 2481 // We only handle pointers and references currently. 2482 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2483 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2484 return; 2485 2486 const bool IsPointer = MemberTy->isPointerType(); 2487 if (IsPointer) { 2488 if (const UnaryOperator *Op 2489 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2490 // The only case we're worried about with pointers requires taking the 2491 // address. 2492 if (Op->getOpcode() != UO_AddrOf) 2493 return; 2494 2495 Init = Op->getSubExpr(); 2496 } else { 2497 // We only handle address-of expression initializers for pointers. 2498 return; 2499 } 2500 } 2501 2502 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2503 // We only warn when referring to a non-reference parameter declaration. 2504 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2505 if (!Parameter || Parameter->getType()->isReferenceType()) 2506 return; 2507 2508 S.Diag(Init->getExprLoc(), 2509 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2510 : diag::warn_bind_ref_member_to_parameter) 2511 << Member << Parameter << Init->getSourceRange(); 2512 } else { 2513 // Other initializers are fine. 2514 return; 2515 } 2516 2517 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2518 << (unsigned)IsPointer; 2519} 2520 2521MemInitResult 2522Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2523 SourceLocation IdLoc) { 2524 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2525 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2526 assert((DirectMember || IndirectMember) && 2527 "Member must be a FieldDecl or IndirectFieldDecl"); 2528 2529 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2530 return true; 2531 2532 if (Member->isInvalidDecl()) 2533 return true; 2534 2535 // Diagnose value-uses of fields to initialize themselves, e.g. 2536 // foo(foo) 2537 // where foo is not also a parameter to the constructor. 2538 // TODO: implement -Wuninitialized and fold this into that framework. 2539 MultiExprArg Args; 2540 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2541 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2542 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2543 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2544 } else { 2545 // Template instantiation doesn't reconstruct ParenListExprs for us. 2546 Args = Init; 2547 } 2548 2549 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2550 != DiagnosticsEngine::Ignored) 2551 for (unsigned i = 0, e = Args.size(); i != e; ++i) 2552 // FIXME: Warn about the case when other fields are used before being 2553 // initialized. For example, let this field be the i'th field. When 2554 // initializing the i'th field, throw a warning if any of the >= i'th 2555 // fields are used, as they are not yet initialized. 2556 // Right now we are only handling the case where the i'th field uses 2557 // itself in its initializer. 2558 // Also need to take into account that some fields may be initialized by 2559 // in-class initializers, see C++11 [class.base.init]p9. 2560 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2561 2562 SourceRange InitRange = Init->getSourceRange(); 2563 2564 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2565 // Can't check initialization for a member of dependent type or when 2566 // any of the arguments are type-dependent expressions. 2567 DiscardCleanupsInEvaluationContext(); 2568 } else { 2569 bool InitList = false; 2570 if (isa<InitListExpr>(Init)) { 2571 InitList = true; 2572 Args = Init; 2573 } 2574 2575 // Initialize the member. 2576 InitializedEntity MemberEntity = 2577 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2578 : InitializedEntity::InitializeMember(IndirectMember, 0); 2579 InitializationKind Kind = 2580 InitList ? InitializationKind::CreateDirectList(IdLoc) 2581 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2582 InitRange.getEnd()); 2583 2584 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2585 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2586 if (MemberInit.isInvalid()) 2587 return true; 2588 2589 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2590 2591 // C++11 [class.base.init]p7: 2592 // The initialization of each base and member constitutes a 2593 // full-expression. 2594 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2595 if (MemberInit.isInvalid()) 2596 return true; 2597 2598 Init = MemberInit.get(); 2599 } 2600 2601 if (DirectMember) { 2602 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2603 InitRange.getBegin(), Init, 2604 InitRange.getEnd()); 2605 } else { 2606 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2607 InitRange.getBegin(), Init, 2608 InitRange.getEnd()); 2609 } 2610} 2611 2612MemInitResult 2613Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2614 CXXRecordDecl *ClassDecl) { 2615 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2616 if (!LangOpts.CPlusPlus11) 2617 return Diag(NameLoc, diag::err_delegating_ctor) 2618 << TInfo->getTypeLoc().getLocalSourceRange(); 2619 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2620 2621 bool InitList = true; 2622 MultiExprArg Args = Init; 2623 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2624 InitList = false; 2625 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2626 } 2627 2628 SourceRange InitRange = Init->getSourceRange(); 2629 // Initialize the object. 2630 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2631 QualType(ClassDecl->getTypeForDecl(), 0)); 2632 InitializationKind Kind = 2633 InitList ? InitializationKind::CreateDirectList(NameLoc) 2634 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2635 InitRange.getEnd()); 2636 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2637 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2638 Args, 0); 2639 if (DelegationInit.isInvalid()) 2640 return true; 2641 2642 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2643 "Delegating constructor with no target?"); 2644 2645 // C++11 [class.base.init]p7: 2646 // The initialization of each base and member constitutes a 2647 // full-expression. 2648 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2649 InitRange.getBegin()); 2650 if (DelegationInit.isInvalid()) 2651 return true; 2652 2653 // If we are in a dependent context, template instantiation will 2654 // perform this type-checking again. Just save the arguments that we 2655 // received in a ParenListExpr. 2656 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2657 // of the information that we have about the base 2658 // initializer. However, deconstructing the ASTs is a dicey process, 2659 // and this approach is far more likely to get the corner cases right. 2660 if (CurContext->isDependentContext()) 2661 DelegationInit = Owned(Init); 2662 2663 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2664 DelegationInit.takeAs<Expr>(), 2665 InitRange.getEnd()); 2666} 2667 2668MemInitResult 2669Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2670 Expr *Init, CXXRecordDecl *ClassDecl, 2671 SourceLocation EllipsisLoc) { 2672 SourceLocation BaseLoc 2673 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2674 2675 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2676 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2677 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2678 2679 // C++ [class.base.init]p2: 2680 // [...] Unless the mem-initializer-id names a nonstatic data 2681 // member of the constructor's class or a direct or virtual base 2682 // of that class, the mem-initializer is ill-formed. A 2683 // mem-initializer-list can initialize a base class using any 2684 // name that denotes that base class type. 2685 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2686 2687 SourceRange InitRange = Init->getSourceRange(); 2688 if (EllipsisLoc.isValid()) { 2689 // This is a pack expansion. 2690 if (!BaseType->containsUnexpandedParameterPack()) { 2691 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2692 << SourceRange(BaseLoc, InitRange.getEnd()); 2693 2694 EllipsisLoc = SourceLocation(); 2695 } 2696 } else { 2697 // Check for any unexpanded parameter packs. 2698 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2699 return true; 2700 2701 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2702 return true; 2703 } 2704 2705 // Check for direct and virtual base classes. 2706 const CXXBaseSpecifier *DirectBaseSpec = 0; 2707 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2708 if (!Dependent) { 2709 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2710 BaseType)) 2711 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2712 2713 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2714 VirtualBaseSpec); 2715 2716 // C++ [base.class.init]p2: 2717 // Unless the mem-initializer-id names a nonstatic data member of the 2718 // constructor's class or a direct or virtual base of that class, the 2719 // mem-initializer is ill-formed. 2720 if (!DirectBaseSpec && !VirtualBaseSpec) { 2721 // If the class has any dependent bases, then it's possible that 2722 // one of those types will resolve to the same type as 2723 // BaseType. Therefore, just treat this as a dependent base 2724 // class initialization. FIXME: Should we try to check the 2725 // initialization anyway? It seems odd. 2726 if (ClassDecl->hasAnyDependentBases()) 2727 Dependent = true; 2728 else 2729 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2730 << BaseType << Context.getTypeDeclType(ClassDecl) 2731 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2732 } 2733 } 2734 2735 if (Dependent) { 2736 DiscardCleanupsInEvaluationContext(); 2737 2738 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2739 /*IsVirtual=*/false, 2740 InitRange.getBegin(), Init, 2741 InitRange.getEnd(), EllipsisLoc); 2742 } 2743 2744 // C++ [base.class.init]p2: 2745 // If a mem-initializer-id is ambiguous because it designates both 2746 // a direct non-virtual base class and an inherited virtual base 2747 // class, the mem-initializer is ill-formed. 2748 if (DirectBaseSpec && VirtualBaseSpec) 2749 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2750 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2751 2752 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; 2753 if (!BaseSpec) 2754 BaseSpec = VirtualBaseSpec; 2755 2756 // Initialize the base. 2757 bool InitList = true; 2758 MultiExprArg Args = Init; 2759 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2760 InitList = false; 2761 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2762 } 2763 2764 InitializedEntity BaseEntity = 2765 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2766 InitializationKind Kind = 2767 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2768 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2769 InitRange.getEnd()); 2770 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2771 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2772 if (BaseInit.isInvalid()) 2773 return true; 2774 2775 // C++11 [class.base.init]p7: 2776 // The initialization of each base and member constitutes a 2777 // full-expression. 2778 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2779 if (BaseInit.isInvalid()) 2780 return true; 2781 2782 // If we are in a dependent context, template instantiation will 2783 // perform this type-checking again. Just save the arguments that we 2784 // received in a ParenListExpr. 2785 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2786 // of the information that we have about the base 2787 // initializer. However, deconstructing the ASTs is a dicey process, 2788 // and this approach is far more likely to get the corner cases right. 2789 if (CurContext->isDependentContext()) 2790 BaseInit = Owned(Init); 2791 2792 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2793 BaseSpec->isVirtual(), 2794 InitRange.getBegin(), 2795 BaseInit.takeAs<Expr>(), 2796 InitRange.getEnd(), EllipsisLoc); 2797} 2798 2799// Create a static_cast\<T&&>(expr). 2800static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2801 if (T.isNull()) T = E->getType(); 2802 QualType TargetType = SemaRef.BuildReferenceType( 2803 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2804 SourceLocation ExprLoc = E->getLocStart(); 2805 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2806 TargetType, ExprLoc); 2807 2808 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2809 SourceRange(ExprLoc, ExprLoc), 2810 E->getSourceRange()).take(); 2811} 2812 2813/// ImplicitInitializerKind - How an implicit base or member initializer should 2814/// initialize its base or member. 2815enum ImplicitInitializerKind { 2816 IIK_Default, 2817 IIK_Copy, 2818 IIK_Move, 2819 IIK_Inherit 2820}; 2821 2822static bool 2823BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2824 ImplicitInitializerKind ImplicitInitKind, 2825 CXXBaseSpecifier *BaseSpec, 2826 bool IsInheritedVirtualBase, 2827 CXXCtorInitializer *&CXXBaseInit) { 2828 InitializedEntity InitEntity 2829 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2830 IsInheritedVirtualBase); 2831 2832 ExprResult BaseInit; 2833 2834 switch (ImplicitInitKind) { 2835 case IIK_Inherit: { 2836 const CXXRecordDecl *Inherited = 2837 Constructor->getInheritedConstructor()->getParent(); 2838 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2839 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2840 // C++11 [class.inhctor]p8: 2841 // Each expression in the expression-list is of the form 2842 // static_cast<T&&>(p), where p is the name of the corresponding 2843 // constructor parameter and T is the declared type of p. 2844 SmallVector<Expr*, 16> Args; 2845 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2846 ParmVarDecl *PD = Constructor->getParamDecl(I); 2847 ExprResult ArgExpr = 2848 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2849 VK_LValue, SourceLocation()); 2850 if (ArgExpr.isInvalid()) 2851 return true; 2852 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2853 } 2854 2855 InitializationKind InitKind = InitializationKind::CreateDirect( 2856 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2857 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 2858 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2859 break; 2860 } 2861 } 2862 // Fall through. 2863 case IIK_Default: { 2864 InitializationKind InitKind 2865 = InitializationKind::CreateDefault(Constructor->getLocation()); 2866 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 2867 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 2868 break; 2869 } 2870 2871 case IIK_Move: 2872 case IIK_Copy: { 2873 bool Moving = ImplicitInitKind == IIK_Move; 2874 ParmVarDecl *Param = Constructor->getParamDecl(0); 2875 QualType ParamType = Param->getType().getNonReferenceType(); 2876 2877 Expr *CopyCtorArg = 2878 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2879 SourceLocation(), Param, false, 2880 Constructor->getLocation(), ParamType, 2881 VK_LValue, 0); 2882 2883 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2884 2885 // Cast to the base class to avoid ambiguities. 2886 QualType ArgTy = 2887 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2888 ParamType.getQualifiers()); 2889 2890 if (Moving) { 2891 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2892 } 2893 2894 CXXCastPath BasePath; 2895 BasePath.push_back(BaseSpec); 2896 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2897 CK_UncheckedDerivedToBase, 2898 Moving ? VK_XValue : VK_LValue, 2899 &BasePath).take(); 2900 2901 InitializationKind InitKind 2902 = InitializationKind::CreateDirect(Constructor->getLocation(), 2903 SourceLocation(), SourceLocation()); 2904 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 2905 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 2906 break; 2907 } 2908 } 2909 2910 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2911 if (BaseInit.isInvalid()) 2912 return true; 2913 2914 CXXBaseInit = 2915 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2916 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2917 SourceLocation()), 2918 BaseSpec->isVirtual(), 2919 SourceLocation(), 2920 BaseInit.takeAs<Expr>(), 2921 SourceLocation(), 2922 SourceLocation()); 2923 2924 return false; 2925} 2926 2927static bool RefersToRValueRef(Expr *MemRef) { 2928 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2929 return Referenced->getType()->isRValueReferenceType(); 2930} 2931 2932static bool 2933BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2934 ImplicitInitializerKind ImplicitInitKind, 2935 FieldDecl *Field, IndirectFieldDecl *Indirect, 2936 CXXCtorInitializer *&CXXMemberInit) { 2937 if (Field->isInvalidDecl()) 2938 return true; 2939 2940 SourceLocation Loc = Constructor->getLocation(); 2941 2942 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2943 bool Moving = ImplicitInitKind == IIK_Move; 2944 ParmVarDecl *Param = Constructor->getParamDecl(0); 2945 QualType ParamType = Param->getType().getNonReferenceType(); 2946 2947 // Suppress copying zero-width bitfields. 2948 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2949 return false; 2950 2951 Expr *MemberExprBase = 2952 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2953 SourceLocation(), Param, false, 2954 Loc, ParamType, VK_LValue, 0); 2955 2956 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2957 2958 if (Moving) { 2959 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2960 } 2961 2962 // Build a reference to this field within the parameter. 2963 CXXScopeSpec SS; 2964 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2965 Sema::LookupMemberName); 2966 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2967 : cast<ValueDecl>(Field), AS_public); 2968 MemberLookup.resolveKind(); 2969 ExprResult CtorArg 2970 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2971 ParamType, Loc, 2972 /*IsArrow=*/false, 2973 SS, 2974 /*TemplateKWLoc=*/SourceLocation(), 2975 /*FirstQualifierInScope=*/0, 2976 MemberLookup, 2977 /*TemplateArgs=*/0); 2978 if (CtorArg.isInvalid()) 2979 return true; 2980 2981 // C++11 [class.copy]p15: 2982 // - if a member m has rvalue reference type T&&, it is direct-initialized 2983 // with static_cast<T&&>(x.m); 2984 if (RefersToRValueRef(CtorArg.get())) { 2985 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2986 } 2987 2988 // When the field we are copying is an array, create index variables for 2989 // each dimension of the array. We use these index variables to subscript 2990 // the source array, and other clients (e.g., CodeGen) will perform the 2991 // necessary iteration with these index variables. 2992 SmallVector<VarDecl *, 4> IndexVariables; 2993 QualType BaseType = Field->getType(); 2994 QualType SizeType = SemaRef.Context.getSizeType(); 2995 bool InitializingArray = false; 2996 while (const ConstantArrayType *Array 2997 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2998 InitializingArray = true; 2999 // Create the iteration variable for this array index. 3000 IdentifierInfo *IterationVarName = 0; 3001 { 3002 SmallString<8> Str; 3003 llvm::raw_svector_ostream OS(Str); 3004 OS << "__i" << IndexVariables.size(); 3005 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3006 } 3007 VarDecl *IterationVar 3008 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3009 IterationVarName, SizeType, 3010 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3011 SC_None); 3012 IndexVariables.push_back(IterationVar); 3013 3014 // Create a reference to the iteration variable. 3015 ExprResult IterationVarRef 3016 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3017 assert(!IterationVarRef.isInvalid() && 3018 "Reference to invented variable cannot fail!"); 3019 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3020 assert(!IterationVarRef.isInvalid() && 3021 "Conversion of invented variable cannot fail!"); 3022 3023 // Subscript the array with this iteration variable. 3024 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3025 IterationVarRef.take(), 3026 Loc); 3027 if (CtorArg.isInvalid()) 3028 return true; 3029 3030 BaseType = Array->getElementType(); 3031 } 3032 3033 // The array subscript expression is an lvalue, which is wrong for moving. 3034 if (Moving && InitializingArray) 3035 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3036 3037 // Construct the entity that we will be initializing. For an array, this 3038 // will be first element in the array, which may require several levels 3039 // of array-subscript entities. 3040 SmallVector<InitializedEntity, 4> Entities; 3041 Entities.reserve(1 + IndexVariables.size()); 3042 if (Indirect) 3043 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3044 else 3045 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3046 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3047 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3048 0, 3049 Entities.back())); 3050 3051 // Direct-initialize to use the copy constructor. 3052 InitializationKind InitKind = 3053 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3054 3055 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3056 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3057 3058 ExprResult MemberInit 3059 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3060 MultiExprArg(&CtorArgE, 1)); 3061 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3062 if (MemberInit.isInvalid()) 3063 return true; 3064 3065 if (Indirect) { 3066 assert(IndexVariables.size() == 0 && 3067 "Indirect field improperly initialized"); 3068 CXXMemberInit 3069 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3070 Loc, Loc, 3071 MemberInit.takeAs<Expr>(), 3072 Loc); 3073 } else 3074 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3075 Loc, MemberInit.takeAs<Expr>(), 3076 Loc, 3077 IndexVariables.data(), 3078 IndexVariables.size()); 3079 return false; 3080 } 3081 3082 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3083 "Unhandled implicit init kind!"); 3084 3085 QualType FieldBaseElementType = 3086 SemaRef.Context.getBaseElementType(Field->getType()); 3087 3088 if (FieldBaseElementType->isRecordType()) { 3089 InitializedEntity InitEntity 3090 = Indirect? InitializedEntity::InitializeMember(Indirect) 3091 : InitializedEntity::InitializeMember(Field); 3092 InitializationKind InitKind = 3093 InitializationKind::CreateDefault(Loc); 3094 3095 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3096 ExprResult MemberInit = 3097 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3098 3099 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3100 if (MemberInit.isInvalid()) 3101 return true; 3102 3103 if (Indirect) 3104 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3105 Indirect, Loc, 3106 Loc, 3107 MemberInit.get(), 3108 Loc); 3109 else 3110 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3111 Field, Loc, Loc, 3112 MemberInit.get(), 3113 Loc); 3114 return false; 3115 } 3116 3117 if (!Field->getParent()->isUnion()) { 3118 if (FieldBaseElementType->isReferenceType()) { 3119 SemaRef.Diag(Constructor->getLocation(), 3120 diag::err_uninitialized_member_in_ctor) 3121 << (int)Constructor->isImplicit() 3122 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3123 << 0 << Field->getDeclName(); 3124 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3125 return true; 3126 } 3127 3128 if (FieldBaseElementType.isConstQualified()) { 3129 SemaRef.Diag(Constructor->getLocation(), 3130 diag::err_uninitialized_member_in_ctor) 3131 << (int)Constructor->isImplicit() 3132 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3133 << 1 << Field->getDeclName(); 3134 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3135 return true; 3136 } 3137 } 3138 3139 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3140 FieldBaseElementType->isObjCRetainableType() && 3141 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3142 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3143 // ARC: 3144 // Default-initialize Objective-C pointers to NULL. 3145 CXXMemberInit 3146 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3147 Loc, Loc, 3148 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3149 Loc); 3150 return false; 3151 } 3152 3153 // Nothing to initialize. 3154 CXXMemberInit = 0; 3155 return false; 3156} 3157 3158namespace { 3159struct BaseAndFieldInfo { 3160 Sema &S; 3161 CXXConstructorDecl *Ctor; 3162 bool AnyErrorsInInits; 3163 ImplicitInitializerKind IIK; 3164 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3165 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3166 3167 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3168 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3169 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3170 if (Generated && Ctor->isCopyConstructor()) 3171 IIK = IIK_Copy; 3172 else if (Generated && Ctor->isMoveConstructor()) 3173 IIK = IIK_Move; 3174 else if (Ctor->getInheritedConstructor()) 3175 IIK = IIK_Inherit; 3176 else 3177 IIK = IIK_Default; 3178 } 3179 3180 bool isImplicitCopyOrMove() const { 3181 switch (IIK) { 3182 case IIK_Copy: 3183 case IIK_Move: 3184 return true; 3185 3186 case IIK_Default: 3187 case IIK_Inherit: 3188 return false; 3189 } 3190 3191 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3192 } 3193 3194 bool addFieldInitializer(CXXCtorInitializer *Init) { 3195 AllToInit.push_back(Init); 3196 3197 // Check whether this initializer makes the field "used". 3198 if (Init->getInit()->HasSideEffects(S.Context)) 3199 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3200 3201 return false; 3202 } 3203}; 3204} 3205 3206/// \brief Determine whether the given indirect field declaration is somewhere 3207/// within an anonymous union. 3208static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3209 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3210 CEnd = F->chain_end(); 3211 C != CEnd; ++C) 3212 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3213 if (Record->isUnion()) 3214 return true; 3215 3216 return false; 3217} 3218 3219/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3220/// array type. 3221static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3222 if (T->isIncompleteArrayType()) 3223 return true; 3224 3225 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3226 if (!ArrayT->getSize()) 3227 return true; 3228 3229 T = ArrayT->getElementType(); 3230 } 3231 3232 return false; 3233} 3234 3235static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3236 FieldDecl *Field, 3237 IndirectFieldDecl *Indirect = 0) { 3238 if (Field->isInvalidDecl()) 3239 return false; 3240 3241 // Overwhelmingly common case: we have a direct initializer for this field. 3242 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3243 return Info.addFieldInitializer(Init); 3244 3245 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3246 // has a brace-or-equal-initializer, the entity is initialized as specified 3247 // in [dcl.init]. 3248 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3249 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3250 Info.Ctor->getLocation(), Field); 3251 CXXCtorInitializer *Init; 3252 if (Indirect) 3253 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3254 SourceLocation(), 3255 SourceLocation(), DIE, 3256 SourceLocation()); 3257 else 3258 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3259 SourceLocation(), 3260 SourceLocation(), DIE, 3261 SourceLocation()); 3262 return Info.addFieldInitializer(Init); 3263 } 3264 3265 // Don't build an implicit initializer for union members if none was 3266 // explicitly specified. 3267 if (Field->getParent()->isUnion() || 3268 (Indirect && isWithinAnonymousUnion(Indirect))) 3269 return false; 3270 3271 // Don't initialize incomplete or zero-length arrays. 3272 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3273 return false; 3274 3275 // Don't try to build an implicit initializer if there were semantic 3276 // errors in any of the initializers (and therefore we might be 3277 // missing some that the user actually wrote). 3278 if (Info.AnyErrorsInInits) 3279 return false; 3280 3281 CXXCtorInitializer *Init = 0; 3282 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3283 Indirect, Init)) 3284 return true; 3285 3286 if (!Init) 3287 return false; 3288 3289 return Info.addFieldInitializer(Init); 3290} 3291 3292bool 3293Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3294 CXXCtorInitializer *Initializer) { 3295 assert(Initializer->isDelegatingInitializer()); 3296 Constructor->setNumCtorInitializers(1); 3297 CXXCtorInitializer **initializer = 3298 new (Context) CXXCtorInitializer*[1]; 3299 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3300 Constructor->setCtorInitializers(initializer); 3301 3302 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3303 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3304 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3305 } 3306 3307 DelegatingCtorDecls.push_back(Constructor); 3308 3309 return false; 3310} 3311 3312bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3313 ArrayRef<CXXCtorInitializer *> Initializers) { 3314 if (Constructor->isDependentContext()) { 3315 // Just store the initializers as written, they will be checked during 3316 // instantiation. 3317 if (!Initializers.empty()) { 3318 Constructor->setNumCtorInitializers(Initializers.size()); 3319 CXXCtorInitializer **baseOrMemberInitializers = 3320 new (Context) CXXCtorInitializer*[Initializers.size()]; 3321 memcpy(baseOrMemberInitializers, Initializers.data(), 3322 Initializers.size() * sizeof(CXXCtorInitializer*)); 3323 Constructor->setCtorInitializers(baseOrMemberInitializers); 3324 } 3325 3326 // Let template instantiation know whether we had errors. 3327 if (AnyErrors) 3328 Constructor->setInvalidDecl(); 3329 3330 return false; 3331 } 3332 3333 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3334 3335 // We need to build the initializer AST according to order of construction 3336 // and not what user specified in the Initializers list. 3337 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3338 if (!ClassDecl) 3339 return true; 3340 3341 bool HadError = false; 3342 3343 for (unsigned i = 0; i < Initializers.size(); i++) { 3344 CXXCtorInitializer *Member = Initializers[i]; 3345 3346 if (Member->isBaseInitializer()) 3347 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3348 else 3349 Info.AllBaseFields[Member->getAnyMember()] = Member; 3350 } 3351 3352 // Keep track of the direct virtual bases. 3353 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3354 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3355 E = ClassDecl->bases_end(); I != E; ++I) { 3356 if (I->isVirtual()) 3357 DirectVBases.insert(I); 3358 } 3359 3360 // Push virtual bases before others. 3361 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3362 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3363 3364 if (CXXCtorInitializer *Value 3365 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3366 // [class.base.init]p7, per DR257: 3367 // A mem-initializer where the mem-initializer-id names a virtual base 3368 // class is ignored during execution of a constructor of any class that 3369 // is not the most derived class. 3370 if (ClassDecl->isAbstract()) { 3371 // FIXME: Provide a fixit to remove the base specifier. This requires 3372 // tracking the location of the associated comma for a base specifier. 3373 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) 3374 << VBase->getType() << ClassDecl; 3375 DiagnoseAbstractType(ClassDecl); 3376 } 3377 3378 Info.AllToInit.push_back(Value); 3379 } else if (!AnyErrors && !ClassDecl->isAbstract()) { 3380 // [class.base.init]p8, per DR257: 3381 // If a given [...] base class is not named by a mem-initializer-id 3382 // [...] and the entity is not a virtual base class of an abstract 3383 // class, then [...] the entity is default-initialized. 3384 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3385 CXXCtorInitializer *CXXBaseInit; 3386 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3387 VBase, IsInheritedVirtualBase, 3388 CXXBaseInit)) { 3389 HadError = true; 3390 continue; 3391 } 3392 3393 Info.AllToInit.push_back(CXXBaseInit); 3394 } 3395 } 3396 3397 // Non-virtual bases. 3398 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3399 E = ClassDecl->bases_end(); Base != E; ++Base) { 3400 // Virtuals are in the virtual base list and already constructed. 3401 if (Base->isVirtual()) 3402 continue; 3403 3404 if (CXXCtorInitializer *Value 3405 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3406 Info.AllToInit.push_back(Value); 3407 } else if (!AnyErrors) { 3408 CXXCtorInitializer *CXXBaseInit; 3409 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3410 Base, /*IsInheritedVirtualBase=*/false, 3411 CXXBaseInit)) { 3412 HadError = true; 3413 continue; 3414 } 3415 3416 Info.AllToInit.push_back(CXXBaseInit); 3417 } 3418 } 3419 3420 // Fields. 3421 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3422 MemEnd = ClassDecl->decls_end(); 3423 Mem != MemEnd; ++Mem) { 3424 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3425 // C++ [class.bit]p2: 3426 // A declaration for a bit-field that omits the identifier declares an 3427 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3428 // initialized. 3429 if (F->isUnnamedBitfield()) 3430 continue; 3431 3432 // If we're not generating the implicit copy/move constructor, then we'll 3433 // handle anonymous struct/union fields based on their individual 3434 // indirect fields. 3435 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3436 continue; 3437 3438 if (CollectFieldInitializer(*this, Info, F)) 3439 HadError = true; 3440 continue; 3441 } 3442 3443 // Beyond this point, we only consider default initialization. 3444 if (Info.isImplicitCopyOrMove()) 3445 continue; 3446 3447 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3448 if (F->getType()->isIncompleteArrayType()) { 3449 assert(ClassDecl->hasFlexibleArrayMember() && 3450 "Incomplete array type is not valid"); 3451 continue; 3452 } 3453 3454 // Initialize each field of an anonymous struct individually. 3455 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3456 HadError = true; 3457 3458 continue; 3459 } 3460 } 3461 3462 unsigned NumInitializers = Info.AllToInit.size(); 3463 if (NumInitializers > 0) { 3464 Constructor->setNumCtorInitializers(NumInitializers); 3465 CXXCtorInitializer **baseOrMemberInitializers = 3466 new (Context) CXXCtorInitializer*[NumInitializers]; 3467 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3468 NumInitializers * sizeof(CXXCtorInitializer*)); 3469 Constructor->setCtorInitializers(baseOrMemberInitializers); 3470 3471 // Constructors implicitly reference the base and member 3472 // destructors. 3473 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3474 Constructor->getParent()); 3475 } 3476 3477 return HadError; 3478} 3479 3480static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3481 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3482 const RecordDecl *RD = RT->getDecl(); 3483 if (RD->isAnonymousStructOrUnion()) { 3484 for (RecordDecl::field_iterator Field = RD->field_begin(), 3485 E = RD->field_end(); Field != E; ++Field) 3486 PopulateKeysForFields(*Field, IdealInits); 3487 return; 3488 } 3489 } 3490 IdealInits.push_back(Field); 3491} 3492 3493static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3494 return Context.getCanonicalType(BaseType).getTypePtr(); 3495} 3496 3497static const void *GetKeyForMember(ASTContext &Context, 3498 CXXCtorInitializer *Member) { 3499 if (!Member->isAnyMemberInitializer()) 3500 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3501 3502 return Member->getAnyMember(); 3503} 3504 3505static void DiagnoseBaseOrMemInitializerOrder( 3506 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3507 ArrayRef<CXXCtorInitializer *> Inits) { 3508 if (Constructor->getDeclContext()->isDependentContext()) 3509 return; 3510 3511 // Don't check initializers order unless the warning is enabled at the 3512 // location of at least one initializer. 3513 bool ShouldCheckOrder = false; 3514 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3515 CXXCtorInitializer *Init = Inits[InitIndex]; 3516 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3517 Init->getSourceLocation()) 3518 != DiagnosticsEngine::Ignored) { 3519 ShouldCheckOrder = true; 3520 break; 3521 } 3522 } 3523 if (!ShouldCheckOrder) 3524 return; 3525 3526 // Build the list of bases and members in the order that they'll 3527 // actually be initialized. The explicit initializers should be in 3528 // this same order but may be missing things. 3529 SmallVector<const void*, 32> IdealInitKeys; 3530 3531 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3532 3533 // 1. Virtual bases. 3534 for (CXXRecordDecl::base_class_const_iterator VBase = 3535 ClassDecl->vbases_begin(), 3536 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3537 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3538 3539 // 2. Non-virtual bases. 3540 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3541 E = ClassDecl->bases_end(); Base != E; ++Base) { 3542 if (Base->isVirtual()) 3543 continue; 3544 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3545 } 3546 3547 // 3. Direct fields. 3548 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3549 E = ClassDecl->field_end(); Field != E; ++Field) { 3550 if (Field->isUnnamedBitfield()) 3551 continue; 3552 3553 PopulateKeysForFields(*Field, IdealInitKeys); 3554 } 3555 3556 unsigned NumIdealInits = IdealInitKeys.size(); 3557 unsigned IdealIndex = 0; 3558 3559 CXXCtorInitializer *PrevInit = 0; 3560 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3561 CXXCtorInitializer *Init = Inits[InitIndex]; 3562 const void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3563 3564 // Scan forward to try to find this initializer in the idealized 3565 // initializers list. 3566 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3567 if (InitKey == IdealInitKeys[IdealIndex]) 3568 break; 3569 3570 // If we didn't find this initializer, it must be because we 3571 // scanned past it on a previous iteration. That can only 3572 // happen if we're out of order; emit a warning. 3573 if (IdealIndex == NumIdealInits && PrevInit) { 3574 Sema::SemaDiagnosticBuilder D = 3575 SemaRef.Diag(PrevInit->getSourceLocation(), 3576 diag::warn_initializer_out_of_order); 3577 3578 if (PrevInit->isAnyMemberInitializer()) 3579 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3580 else 3581 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3582 3583 if (Init->isAnyMemberInitializer()) 3584 D << 0 << Init->getAnyMember()->getDeclName(); 3585 else 3586 D << 1 << Init->getTypeSourceInfo()->getType(); 3587 3588 // Move back to the initializer's location in the ideal list. 3589 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3590 if (InitKey == IdealInitKeys[IdealIndex]) 3591 break; 3592 3593 assert(IdealIndex != NumIdealInits && 3594 "initializer not found in initializer list"); 3595 } 3596 3597 PrevInit = Init; 3598 } 3599} 3600 3601namespace { 3602bool CheckRedundantInit(Sema &S, 3603 CXXCtorInitializer *Init, 3604 CXXCtorInitializer *&PrevInit) { 3605 if (!PrevInit) { 3606 PrevInit = Init; 3607 return false; 3608 } 3609 3610 if (FieldDecl *Field = Init->getAnyMember()) 3611 S.Diag(Init->getSourceLocation(), 3612 diag::err_multiple_mem_initialization) 3613 << Field->getDeclName() 3614 << Init->getSourceRange(); 3615 else { 3616 const Type *BaseClass = Init->getBaseClass(); 3617 assert(BaseClass && "neither field nor base"); 3618 S.Diag(Init->getSourceLocation(), 3619 diag::err_multiple_base_initialization) 3620 << QualType(BaseClass, 0) 3621 << Init->getSourceRange(); 3622 } 3623 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3624 << 0 << PrevInit->getSourceRange(); 3625 3626 return true; 3627} 3628 3629typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3630typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3631 3632bool CheckRedundantUnionInit(Sema &S, 3633 CXXCtorInitializer *Init, 3634 RedundantUnionMap &Unions) { 3635 FieldDecl *Field = Init->getAnyMember(); 3636 RecordDecl *Parent = Field->getParent(); 3637 NamedDecl *Child = Field; 3638 3639 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3640 if (Parent->isUnion()) { 3641 UnionEntry &En = Unions[Parent]; 3642 if (En.first && En.first != Child) { 3643 S.Diag(Init->getSourceLocation(), 3644 diag::err_multiple_mem_union_initialization) 3645 << Field->getDeclName() 3646 << Init->getSourceRange(); 3647 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3648 << 0 << En.second->getSourceRange(); 3649 return true; 3650 } 3651 if (!En.first) { 3652 En.first = Child; 3653 En.second = Init; 3654 } 3655 if (!Parent->isAnonymousStructOrUnion()) 3656 return false; 3657 } 3658 3659 Child = Parent; 3660 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3661 } 3662 3663 return false; 3664} 3665} 3666 3667/// ActOnMemInitializers - Handle the member initializers for a constructor. 3668void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3669 SourceLocation ColonLoc, 3670 ArrayRef<CXXCtorInitializer*> MemInits, 3671 bool AnyErrors) { 3672 if (!ConstructorDecl) 3673 return; 3674 3675 AdjustDeclIfTemplate(ConstructorDecl); 3676 3677 CXXConstructorDecl *Constructor 3678 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3679 3680 if (!Constructor) { 3681 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3682 return; 3683 } 3684 3685 // Mapping for the duplicate initializers check. 3686 // For member initializers, this is keyed with a FieldDecl*. 3687 // For base initializers, this is keyed with a Type*. 3688 llvm::DenseMap<const void *, CXXCtorInitializer *> Members; 3689 3690 // Mapping for the inconsistent anonymous-union initializers check. 3691 RedundantUnionMap MemberUnions; 3692 3693 bool HadError = false; 3694 for (unsigned i = 0; i < MemInits.size(); i++) { 3695 CXXCtorInitializer *Init = MemInits[i]; 3696 3697 // Set the source order index. 3698 Init->setSourceOrder(i); 3699 3700 if (Init->isAnyMemberInitializer()) { 3701 FieldDecl *Field = Init->getAnyMember(); 3702 if (CheckRedundantInit(*this, Init, Members[Field]) || 3703 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3704 HadError = true; 3705 } else if (Init->isBaseInitializer()) { 3706 const void *Key = 3707 GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3708 if (CheckRedundantInit(*this, Init, Members[Key])) 3709 HadError = true; 3710 } else { 3711 assert(Init->isDelegatingInitializer()); 3712 // This must be the only initializer 3713 if (MemInits.size() != 1) { 3714 Diag(Init->getSourceLocation(), 3715 diag::err_delegating_initializer_alone) 3716 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3717 // We will treat this as being the only initializer. 3718 } 3719 SetDelegatingInitializer(Constructor, MemInits[i]); 3720 // Return immediately as the initializer is set. 3721 return; 3722 } 3723 } 3724 3725 if (HadError) 3726 return; 3727 3728 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3729 3730 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3731} 3732 3733void 3734Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3735 CXXRecordDecl *ClassDecl) { 3736 // Ignore dependent contexts. Also ignore unions, since their members never 3737 // have destructors implicitly called. 3738 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3739 return; 3740 3741 // FIXME: all the access-control diagnostics are positioned on the 3742 // field/base declaration. That's probably good; that said, the 3743 // user might reasonably want to know why the destructor is being 3744 // emitted, and we currently don't say. 3745 3746 // Non-static data members. 3747 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3748 E = ClassDecl->field_end(); I != E; ++I) { 3749 FieldDecl *Field = *I; 3750 if (Field->isInvalidDecl()) 3751 continue; 3752 3753 // Don't destroy incomplete or zero-length arrays. 3754 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3755 continue; 3756 3757 QualType FieldType = Context.getBaseElementType(Field->getType()); 3758 3759 const RecordType* RT = FieldType->getAs<RecordType>(); 3760 if (!RT) 3761 continue; 3762 3763 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3764 if (FieldClassDecl->isInvalidDecl()) 3765 continue; 3766 if (FieldClassDecl->hasIrrelevantDestructor()) 3767 continue; 3768 // The destructor for an implicit anonymous union member is never invoked. 3769 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3770 continue; 3771 3772 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3773 assert(Dtor && "No dtor found for FieldClassDecl!"); 3774 CheckDestructorAccess(Field->getLocation(), Dtor, 3775 PDiag(diag::err_access_dtor_field) 3776 << Field->getDeclName() 3777 << FieldType); 3778 3779 MarkFunctionReferenced(Location, Dtor); 3780 DiagnoseUseOfDecl(Dtor, Location); 3781 } 3782 3783 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3784 3785 // Bases. 3786 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3787 E = ClassDecl->bases_end(); Base != E; ++Base) { 3788 // Bases are always records in a well-formed non-dependent class. 3789 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3790 3791 // Remember direct virtual bases. 3792 if (Base->isVirtual()) 3793 DirectVirtualBases.insert(RT); 3794 3795 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3796 // If our base class is invalid, we probably can't get its dtor anyway. 3797 if (BaseClassDecl->isInvalidDecl()) 3798 continue; 3799 if (BaseClassDecl->hasIrrelevantDestructor()) 3800 continue; 3801 3802 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3803 assert(Dtor && "No dtor found for BaseClassDecl!"); 3804 3805 // FIXME: caret should be on the start of the class name 3806 CheckDestructorAccess(Base->getLocStart(), Dtor, 3807 PDiag(diag::err_access_dtor_base) 3808 << Base->getType() 3809 << Base->getSourceRange(), 3810 Context.getTypeDeclType(ClassDecl)); 3811 3812 MarkFunctionReferenced(Location, Dtor); 3813 DiagnoseUseOfDecl(Dtor, Location); 3814 } 3815 3816 // Virtual bases. 3817 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3818 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3819 3820 // Bases are always records in a well-formed non-dependent class. 3821 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3822 3823 // Ignore direct virtual bases. 3824 if (DirectVirtualBases.count(RT)) 3825 continue; 3826 3827 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3828 // If our base class is invalid, we probably can't get its dtor anyway. 3829 if (BaseClassDecl->isInvalidDecl()) 3830 continue; 3831 if (BaseClassDecl->hasIrrelevantDestructor()) 3832 continue; 3833 3834 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3835 assert(Dtor && "No dtor found for BaseClassDecl!"); 3836 if (CheckDestructorAccess( 3837 ClassDecl->getLocation(), Dtor, 3838 PDiag(diag::err_access_dtor_vbase) 3839 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 3840 Context.getTypeDeclType(ClassDecl)) == 3841 AR_accessible) { 3842 CheckDerivedToBaseConversion( 3843 Context.getTypeDeclType(ClassDecl), VBase->getType(), 3844 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 3845 SourceRange(), DeclarationName(), 0); 3846 } 3847 3848 MarkFunctionReferenced(Location, Dtor); 3849 DiagnoseUseOfDecl(Dtor, Location); 3850 } 3851} 3852 3853void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3854 if (!CDtorDecl) 3855 return; 3856 3857 if (CXXConstructorDecl *Constructor 3858 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3859 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3860} 3861 3862bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3863 unsigned DiagID, AbstractDiagSelID SelID) { 3864 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3865 unsigned DiagID; 3866 AbstractDiagSelID SelID; 3867 3868 public: 3869 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3870 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3871 3872 void diagnose(Sema &S, SourceLocation Loc, QualType T) LLVM_OVERRIDE { 3873 if (Suppressed) return; 3874 if (SelID == -1) 3875 S.Diag(Loc, DiagID) << T; 3876 else 3877 S.Diag(Loc, DiagID) << SelID << T; 3878 } 3879 } Diagnoser(DiagID, SelID); 3880 3881 return RequireNonAbstractType(Loc, T, Diagnoser); 3882} 3883 3884bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3885 TypeDiagnoser &Diagnoser) { 3886 if (!getLangOpts().CPlusPlus) 3887 return false; 3888 3889 if (const ArrayType *AT = Context.getAsArrayType(T)) 3890 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3891 3892 if (const PointerType *PT = T->getAs<PointerType>()) { 3893 // Find the innermost pointer type. 3894 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3895 PT = T; 3896 3897 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3898 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3899 } 3900 3901 const RecordType *RT = T->getAs<RecordType>(); 3902 if (!RT) 3903 return false; 3904 3905 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3906 3907 // We can't answer whether something is abstract until it has a 3908 // definition. If it's currently being defined, we'll walk back 3909 // over all the declarations when we have a full definition. 3910 const CXXRecordDecl *Def = RD->getDefinition(); 3911 if (!Def || Def->isBeingDefined()) 3912 return false; 3913 3914 if (!RD->isAbstract()) 3915 return false; 3916 3917 Diagnoser.diagnose(*this, Loc, T); 3918 DiagnoseAbstractType(RD); 3919 3920 return true; 3921} 3922 3923void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3924 // Check if we've already emitted the list of pure virtual functions 3925 // for this class. 3926 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3927 return; 3928 3929 // If the diagnostic is suppressed, don't emit the notes. We're only 3930 // going to emit them once, so try to attach them to a diagnostic we're 3931 // actually going to show. 3932 if (Diags.isLastDiagnosticIgnored()) 3933 return; 3934 3935 CXXFinalOverriderMap FinalOverriders; 3936 RD->getFinalOverriders(FinalOverriders); 3937 3938 // Keep a set of seen pure methods so we won't diagnose the same method 3939 // more than once. 3940 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3941 3942 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3943 MEnd = FinalOverriders.end(); 3944 M != MEnd; 3945 ++M) { 3946 for (OverridingMethods::iterator SO = M->second.begin(), 3947 SOEnd = M->second.end(); 3948 SO != SOEnd; ++SO) { 3949 // C++ [class.abstract]p4: 3950 // A class is abstract if it contains or inherits at least one 3951 // pure virtual function for which the final overrider is pure 3952 // virtual. 3953 3954 // 3955 if (SO->second.size() != 1) 3956 continue; 3957 3958 if (!SO->second.front().Method->isPure()) 3959 continue; 3960 3961 if (!SeenPureMethods.insert(SO->second.front().Method)) 3962 continue; 3963 3964 Diag(SO->second.front().Method->getLocation(), 3965 diag::note_pure_virtual_function) 3966 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3967 } 3968 } 3969 3970 if (!PureVirtualClassDiagSet) 3971 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3972 PureVirtualClassDiagSet->insert(RD); 3973} 3974 3975namespace { 3976struct AbstractUsageInfo { 3977 Sema &S; 3978 CXXRecordDecl *Record; 3979 CanQualType AbstractType; 3980 bool Invalid; 3981 3982 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3983 : S(S), Record(Record), 3984 AbstractType(S.Context.getCanonicalType( 3985 S.Context.getTypeDeclType(Record))), 3986 Invalid(false) {} 3987 3988 void DiagnoseAbstractType() { 3989 if (Invalid) return; 3990 S.DiagnoseAbstractType(Record); 3991 Invalid = true; 3992 } 3993 3994 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3995}; 3996 3997struct CheckAbstractUsage { 3998 AbstractUsageInfo &Info; 3999 const NamedDecl *Ctx; 4000 4001 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 4002 : Info(Info), Ctx(Ctx) {} 4003 4004 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4005 switch (TL.getTypeLocClass()) { 4006#define ABSTRACT_TYPELOC(CLASS, PARENT) 4007#define TYPELOC(CLASS, PARENT) \ 4008 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 4009#include "clang/AST/TypeLocNodes.def" 4010 } 4011 } 4012 4013 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4014 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 4015 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4016 if (!TL.getArg(I)) 4017 continue; 4018 4019 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 4020 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4021 } 4022 } 4023 4024 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4025 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4026 } 4027 4028 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4029 // Visit the type parameters from a permissive context. 4030 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4031 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4032 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4033 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4034 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4035 // TODO: other template argument types? 4036 } 4037 } 4038 4039 // Visit pointee types from a permissive context. 4040#define CheckPolymorphic(Type) \ 4041 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4042 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4043 } 4044 CheckPolymorphic(PointerTypeLoc) 4045 CheckPolymorphic(ReferenceTypeLoc) 4046 CheckPolymorphic(MemberPointerTypeLoc) 4047 CheckPolymorphic(BlockPointerTypeLoc) 4048 CheckPolymorphic(AtomicTypeLoc) 4049 4050 /// Handle all the types we haven't given a more specific 4051 /// implementation for above. 4052 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4053 // Every other kind of type that we haven't called out already 4054 // that has an inner type is either (1) sugar or (2) contains that 4055 // inner type in some way as a subobject. 4056 if (TypeLoc Next = TL.getNextTypeLoc()) 4057 return Visit(Next, Sel); 4058 4059 // If there's no inner type and we're in a permissive context, 4060 // don't diagnose. 4061 if (Sel == Sema::AbstractNone) return; 4062 4063 // Check whether the type matches the abstract type. 4064 QualType T = TL.getType(); 4065 if (T->isArrayType()) { 4066 Sel = Sema::AbstractArrayType; 4067 T = Info.S.Context.getBaseElementType(T); 4068 } 4069 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4070 if (CT != Info.AbstractType) return; 4071 4072 // It matched; do some magic. 4073 if (Sel == Sema::AbstractArrayType) { 4074 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4075 << T << TL.getSourceRange(); 4076 } else { 4077 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4078 << Sel << T << TL.getSourceRange(); 4079 } 4080 Info.DiagnoseAbstractType(); 4081 } 4082}; 4083 4084void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4085 Sema::AbstractDiagSelID Sel) { 4086 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4087} 4088 4089} 4090 4091/// Check for invalid uses of an abstract type in a method declaration. 4092static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4093 CXXMethodDecl *MD) { 4094 // No need to do the check on definitions, which require that 4095 // the return/param types be complete. 4096 if (MD->doesThisDeclarationHaveABody()) 4097 return; 4098 4099 // For safety's sake, just ignore it if we don't have type source 4100 // information. This should never happen for non-implicit methods, 4101 // but... 4102 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4103 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4104} 4105 4106/// Check for invalid uses of an abstract type within a class definition. 4107static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4108 CXXRecordDecl *RD) { 4109 for (CXXRecordDecl::decl_iterator 4110 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4111 Decl *D = *I; 4112 if (D->isImplicit()) continue; 4113 4114 // Methods and method templates. 4115 if (isa<CXXMethodDecl>(D)) { 4116 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4117 } else if (isa<FunctionTemplateDecl>(D)) { 4118 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4119 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4120 4121 // Fields and static variables. 4122 } else if (isa<FieldDecl>(D)) { 4123 FieldDecl *FD = cast<FieldDecl>(D); 4124 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4125 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4126 } else if (isa<VarDecl>(D)) { 4127 VarDecl *VD = cast<VarDecl>(D); 4128 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4129 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4130 4131 // Nested classes and class templates. 4132 } else if (isa<CXXRecordDecl>(D)) { 4133 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4134 } else if (isa<ClassTemplateDecl>(D)) { 4135 CheckAbstractClassUsage(Info, 4136 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4137 } 4138 } 4139} 4140 4141/// \brief Perform semantic checks on a class definition that has been 4142/// completing, introducing implicitly-declared members, checking for 4143/// abstract types, etc. 4144void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4145 if (!Record) 4146 return; 4147 4148 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4149 AbstractUsageInfo Info(*this, Record); 4150 CheckAbstractClassUsage(Info, Record); 4151 } 4152 4153 // If this is not an aggregate type and has no user-declared constructor, 4154 // complain about any non-static data members of reference or const scalar 4155 // type, since they will never get initializers. 4156 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4157 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4158 !Record->isLambda()) { 4159 bool Complained = false; 4160 for (RecordDecl::field_iterator F = Record->field_begin(), 4161 FEnd = Record->field_end(); 4162 F != FEnd; ++F) { 4163 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4164 continue; 4165 4166 if (F->getType()->isReferenceType() || 4167 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4168 if (!Complained) { 4169 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4170 << Record->getTagKind() << Record; 4171 Complained = true; 4172 } 4173 4174 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4175 << F->getType()->isReferenceType() 4176 << F->getDeclName(); 4177 } 4178 } 4179 } 4180 4181 if (Record->isDynamicClass() && !Record->isDependentType()) 4182 DynamicClasses.push_back(Record); 4183 4184 if (Record->getIdentifier()) { 4185 // C++ [class.mem]p13: 4186 // If T is the name of a class, then each of the following shall have a 4187 // name different from T: 4188 // - every member of every anonymous union that is a member of class T. 4189 // 4190 // C++ [class.mem]p14: 4191 // In addition, if class T has a user-declared constructor (12.1), every 4192 // non-static data member of class T shall have a name different from T. 4193 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4194 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4195 ++I) { 4196 NamedDecl *D = *I; 4197 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4198 isa<IndirectFieldDecl>(D)) { 4199 Diag(D->getLocation(), diag::err_member_name_of_class) 4200 << D->getDeclName(); 4201 break; 4202 } 4203 } 4204 } 4205 4206 // Warn if the class has virtual methods but non-virtual public destructor. 4207 if (Record->isPolymorphic() && !Record->isDependentType()) { 4208 CXXDestructorDecl *dtor = Record->getDestructor(); 4209 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4210 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4211 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4212 } 4213 4214 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4215 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4216 DiagnoseAbstractType(Record); 4217 } 4218 4219 if (!Record->isDependentType()) { 4220 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4221 MEnd = Record->method_end(); 4222 M != MEnd; ++M) { 4223 // See if a method overloads virtual methods in a base 4224 // class without overriding any. 4225 if (!M->isStatic()) 4226 DiagnoseHiddenVirtualMethods(Record, *M); 4227 4228 // Check whether the explicitly-defaulted special members are valid. 4229 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4230 CheckExplicitlyDefaultedSpecialMember(*M); 4231 4232 // For an explicitly defaulted or deleted special member, we defer 4233 // determining triviality until the class is complete. That time is now! 4234 if (!M->isImplicit() && !M->isUserProvided()) { 4235 CXXSpecialMember CSM = getSpecialMember(*M); 4236 if (CSM != CXXInvalid) { 4237 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4238 4239 // Inform the class that we've finished declaring this member. 4240 Record->finishedDefaultedOrDeletedMember(*M); 4241 } 4242 } 4243 } 4244 } 4245 4246 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4247 // function that is not a constructor declares that member function to be 4248 // const. [...] The class of which that function is a member shall be 4249 // a literal type. 4250 // 4251 // If the class has virtual bases, any constexpr members will already have 4252 // been diagnosed by the checks performed on the member declaration, so 4253 // suppress this (less useful) diagnostic. 4254 // 4255 // We delay this until we know whether an explicitly-defaulted (or deleted) 4256 // destructor for the class is trivial. 4257 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4258 !Record->isLiteral() && !Record->getNumVBases()) { 4259 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4260 MEnd = Record->method_end(); 4261 M != MEnd; ++M) { 4262 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4263 switch (Record->getTemplateSpecializationKind()) { 4264 case TSK_ImplicitInstantiation: 4265 case TSK_ExplicitInstantiationDeclaration: 4266 case TSK_ExplicitInstantiationDefinition: 4267 // If a template instantiates to a non-literal type, but its members 4268 // instantiate to constexpr functions, the template is technically 4269 // ill-formed, but we allow it for sanity. 4270 continue; 4271 4272 case TSK_Undeclared: 4273 case TSK_ExplicitSpecialization: 4274 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4275 diag::err_constexpr_method_non_literal); 4276 break; 4277 } 4278 4279 // Only produce one error per class. 4280 break; 4281 } 4282 } 4283 } 4284 4285 // Declare inheriting constructors. We do this eagerly here because: 4286 // - The standard requires an eager diagnostic for conflicting inheriting 4287 // constructors from different classes. 4288 // - The lazy declaration of the other implicit constructors is so as to not 4289 // waste space and performance on classes that are not meant to be 4290 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4291 // have inheriting constructors. 4292 DeclareInheritingConstructors(Record); 4293} 4294 4295/// Is the special member function which would be selected to perform the 4296/// specified operation on the specified class type a constexpr constructor? 4297static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4298 Sema::CXXSpecialMember CSM, 4299 bool ConstArg) { 4300 Sema::SpecialMemberOverloadResult *SMOR = 4301 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4302 false, false, false, false); 4303 if (!SMOR || !SMOR->getMethod()) 4304 // A constructor we wouldn't select can't be "involved in initializing" 4305 // anything. 4306 return true; 4307 return SMOR->getMethod()->isConstexpr(); 4308} 4309 4310/// Determine whether the specified special member function would be constexpr 4311/// if it were implicitly defined. 4312static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4313 Sema::CXXSpecialMember CSM, 4314 bool ConstArg) { 4315 if (!S.getLangOpts().CPlusPlus11) 4316 return false; 4317 4318 // C++11 [dcl.constexpr]p4: 4319 // In the definition of a constexpr constructor [...] 4320 bool Ctor = true; 4321 switch (CSM) { 4322 case Sema::CXXDefaultConstructor: 4323 // Since default constructor lookup is essentially trivial (and cannot 4324 // involve, for instance, template instantiation), we compute whether a 4325 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4326 // 4327 // This is important for performance; we need to know whether the default 4328 // constructor is constexpr to determine whether the type is a literal type. 4329 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4330 4331 case Sema::CXXCopyConstructor: 4332 case Sema::CXXMoveConstructor: 4333 // For copy or move constructors, we need to perform overload resolution. 4334 break; 4335 4336 case Sema::CXXCopyAssignment: 4337 case Sema::CXXMoveAssignment: 4338 if (!S.getLangOpts().CPlusPlus1y) 4339 return false; 4340 // In C++1y, we need to perform overload resolution. 4341 Ctor = false; 4342 break; 4343 4344 case Sema::CXXDestructor: 4345 case Sema::CXXInvalid: 4346 return false; 4347 } 4348 4349 // -- if the class is a non-empty union, or for each non-empty anonymous 4350 // union member of a non-union class, exactly one non-static data member 4351 // shall be initialized; [DR1359] 4352 // 4353 // If we squint, this is guaranteed, since exactly one non-static data member 4354 // will be initialized (if the constructor isn't deleted), we just don't know 4355 // which one. 4356 if (Ctor && ClassDecl->isUnion()) 4357 return true; 4358 4359 // -- the class shall not have any virtual base classes; 4360 if (Ctor && ClassDecl->getNumVBases()) 4361 return false; 4362 4363 // C++1y [class.copy]p26: 4364 // -- [the class] is a literal type, and 4365 if (!Ctor && !ClassDecl->isLiteral()) 4366 return false; 4367 4368 // -- every constructor involved in initializing [...] base class 4369 // sub-objects shall be a constexpr constructor; 4370 // -- the assignment operator selected to copy/move each direct base 4371 // class is a constexpr function, and 4372 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4373 BEnd = ClassDecl->bases_end(); 4374 B != BEnd; ++B) { 4375 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4376 if (!BaseType) continue; 4377 4378 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4379 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4380 return false; 4381 } 4382 4383 // -- every constructor involved in initializing non-static data members 4384 // [...] shall be a constexpr constructor; 4385 // -- every non-static data member and base class sub-object shall be 4386 // initialized 4387 // -- for each non-stastic data member of X that is of class type (or array 4388 // thereof), the assignment operator selected to copy/move that member is 4389 // a constexpr function 4390 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4391 FEnd = ClassDecl->field_end(); 4392 F != FEnd; ++F) { 4393 if (F->isInvalidDecl()) 4394 continue; 4395 if (const RecordType *RecordTy = 4396 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4397 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4398 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4399 return false; 4400 } 4401 } 4402 4403 // All OK, it's constexpr! 4404 return true; 4405} 4406 4407static Sema::ImplicitExceptionSpecification 4408computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4409 switch (S.getSpecialMember(MD)) { 4410 case Sema::CXXDefaultConstructor: 4411 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4412 case Sema::CXXCopyConstructor: 4413 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4414 case Sema::CXXCopyAssignment: 4415 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4416 case Sema::CXXMoveConstructor: 4417 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4418 case Sema::CXXMoveAssignment: 4419 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4420 case Sema::CXXDestructor: 4421 return S.ComputeDefaultedDtorExceptionSpec(MD); 4422 case Sema::CXXInvalid: 4423 break; 4424 } 4425 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4426 "only special members have implicit exception specs"); 4427 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4428} 4429 4430static void 4431updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4432 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4433 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4434 ExceptSpec.getEPI(EPI); 4435 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4436 FPT->getArgTypes(), EPI)); 4437} 4438 4439void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4440 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4441 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4442 return; 4443 4444 // Evaluate the exception specification. 4445 ImplicitExceptionSpecification ExceptSpec = 4446 computeImplicitExceptionSpec(*this, Loc, MD); 4447 4448 // Update the type of the special member to use it. 4449 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4450 4451 // A user-provided destructor can be defined outside the class. When that 4452 // happens, be sure to update the exception specification on both 4453 // declarations. 4454 const FunctionProtoType *CanonicalFPT = 4455 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4456 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4457 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4458 CanonicalFPT, ExceptSpec); 4459} 4460 4461void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4462 CXXRecordDecl *RD = MD->getParent(); 4463 CXXSpecialMember CSM = getSpecialMember(MD); 4464 4465 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4466 "not an explicitly-defaulted special member"); 4467 4468 // Whether this was the first-declared instance of the constructor. 4469 // This affects whether we implicitly add an exception spec and constexpr. 4470 bool First = MD == MD->getCanonicalDecl(); 4471 4472 bool HadError = false; 4473 4474 // C++11 [dcl.fct.def.default]p1: 4475 // A function that is explicitly defaulted shall 4476 // -- be a special member function (checked elsewhere), 4477 // -- have the same type (except for ref-qualifiers, and except that a 4478 // copy operation can take a non-const reference) as an implicit 4479 // declaration, and 4480 // -- not have default arguments. 4481 unsigned ExpectedParams = 1; 4482 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4483 ExpectedParams = 0; 4484 if (MD->getNumParams() != ExpectedParams) { 4485 // This also checks for default arguments: a copy or move constructor with a 4486 // default argument is classified as a default constructor, and assignment 4487 // operations and destructors can't have default arguments. 4488 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4489 << CSM << MD->getSourceRange(); 4490 HadError = true; 4491 } else if (MD->isVariadic()) { 4492 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4493 << CSM << MD->getSourceRange(); 4494 HadError = true; 4495 } 4496 4497 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4498 4499 bool CanHaveConstParam = false; 4500 if (CSM == CXXCopyConstructor) 4501 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4502 else if (CSM == CXXCopyAssignment) 4503 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4504 4505 QualType ReturnType = Context.VoidTy; 4506 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4507 // Check for return type matching. 4508 ReturnType = Type->getResultType(); 4509 QualType ExpectedReturnType = 4510 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4511 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4512 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4513 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4514 HadError = true; 4515 } 4516 4517 // A defaulted special member cannot have cv-qualifiers. 4518 if (Type->getTypeQuals()) { 4519 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4520 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4521 HadError = true; 4522 } 4523 } 4524 4525 // Check for parameter type matching. 4526 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4527 bool HasConstParam = false; 4528 if (ExpectedParams && ArgType->isReferenceType()) { 4529 // Argument must be reference to possibly-const T. 4530 QualType ReferentType = ArgType->getPointeeType(); 4531 HasConstParam = ReferentType.isConstQualified(); 4532 4533 if (ReferentType.isVolatileQualified()) { 4534 Diag(MD->getLocation(), 4535 diag::err_defaulted_special_member_volatile_param) << CSM; 4536 HadError = true; 4537 } 4538 4539 if (HasConstParam && !CanHaveConstParam) { 4540 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4541 Diag(MD->getLocation(), 4542 diag::err_defaulted_special_member_copy_const_param) 4543 << (CSM == CXXCopyAssignment); 4544 // FIXME: Explain why this special member can't be const. 4545 } else { 4546 Diag(MD->getLocation(), 4547 diag::err_defaulted_special_member_move_const_param) 4548 << (CSM == CXXMoveAssignment); 4549 } 4550 HadError = true; 4551 } 4552 } else if (ExpectedParams) { 4553 // A copy assignment operator can take its argument by value, but a 4554 // defaulted one cannot. 4555 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4556 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4557 HadError = true; 4558 } 4559 4560 // C++11 [dcl.fct.def.default]p2: 4561 // An explicitly-defaulted function may be declared constexpr only if it 4562 // would have been implicitly declared as constexpr, 4563 // Do not apply this rule to members of class templates, since core issue 1358 4564 // makes such functions always instantiate to constexpr functions. For 4565 // functions which cannot be constexpr (for non-constructors in C++11 and for 4566 // destructors in C++1y), this is checked elsewhere. 4567 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4568 HasConstParam); 4569 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4570 : isa<CXXConstructorDecl>(MD)) && 4571 MD->isConstexpr() && !Constexpr && 4572 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4573 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4574 // FIXME: Explain why the special member can't be constexpr. 4575 HadError = true; 4576 } 4577 4578 // and may have an explicit exception-specification only if it is compatible 4579 // with the exception-specification on the implicit declaration. 4580 if (Type->hasExceptionSpec()) { 4581 // Delay the check if this is the first declaration of the special member, 4582 // since we may not have parsed some necessary in-class initializers yet. 4583 if (First) { 4584 // If the exception specification needs to be instantiated, do so now, 4585 // before we clobber it with an EST_Unevaluated specification below. 4586 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4587 InstantiateExceptionSpec(MD->getLocStart(), MD); 4588 Type = MD->getType()->getAs<FunctionProtoType>(); 4589 } 4590 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4591 } else 4592 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4593 } 4594 4595 // If a function is explicitly defaulted on its first declaration, 4596 if (First) { 4597 // -- it is implicitly considered to be constexpr if the implicit 4598 // definition would be, 4599 MD->setConstexpr(Constexpr); 4600 4601 // -- it is implicitly considered to have the same exception-specification 4602 // as if it had been implicitly declared, 4603 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4604 EPI.ExceptionSpecType = EST_Unevaluated; 4605 EPI.ExceptionSpecDecl = MD; 4606 MD->setType(Context.getFunctionType(ReturnType, 4607 ArrayRef<QualType>(&ArgType, 4608 ExpectedParams), 4609 EPI)); 4610 } 4611 4612 if (ShouldDeleteSpecialMember(MD, CSM)) { 4613 if (First) { 4614 SetDeclDeleted(MD, MD->getLocation()); 4615 } else { 4616 // C++11 [dcl.fct.def.default]p4: 4617 // [For a] user-provided explicitly-defaulted function [...] if such a 4618 // function is implicitly defined as deleted, the program is ill-formed. 4619 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4620 HadError = true; 4621 } 4622 } 4623 4624 if (HadError) 4625 MD->setInvalidDecl(); 4626} 4627 4628/// Check whether the exception specification provided for an 4629/// explicitly-defaulted special member matches the exception specification 4630/// that would have been generated for an implicit special member, per 4631/// C++11 [dcl.fct.def.default]p2. 4632void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4633 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4634 // Compute the implicit exception specification. 4635 FunctionProtoType::ExtProtoInfo EPI; 4636 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4637 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4638 Context.getFunctionType(Context.VoidTy, None, EPI)); 4639 4640 // Ensure that it matches. 4641 CheckEquivalentExceptionSpec( 4642 PDiag(diag::err_incorrect_defaulted_exception_spec) 4643 << getSpecialMember(MD), PDiag(), 4644 ImplicitType, SourceLocation(), 4645 SpecifiedType, MD->getLocation()); 4646} 4647 4648void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4649 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4650 I != N; ++I) 4651 CheckExplicitlyDefaultedMemberExceptionSpec( 4652 DelayedDefaultedMemberExceptionSpecs[I].first, 4653 DelayedDefaultedMemberExceptionSpecs[I].second); 4654 4655 DelayedDefaultedMemberExceptionSpecs.clear(); 4656} 4657 4658namespace { 4659struct SpecialMemberDeletionInfo { 4660 Sema &S; 4661 CXXMethodDecl *MD; 4662 Sema::CXXSpecialMember CSM; 4663 bool Diagnose; 4664 4665 // Properties of the special member, computed for convenience. 4666 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4667 SourceLocation Loc; 4668 4669 bool AllFieldsAreConst; 4670 4671 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4672 Sema::CXXSpecialMember CSM, bool Diagnose) 4673 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4674 IsConstructor(false), IsAssignment(false), IsMove(false), 4675 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4676 AllFieldsAreConst(true) { 4677 switch (CSM) { 4678 case Sema::CXXDefaultConstructor: 4679 case Sema::CXXCopyConstructor: 4680 IsConstructor = true; 4681 break; 4682 case Sema::CXXMoveConstructor: 4683 IsConstructor = true; 4684 IsMove = true; 4685 break; 4686 case Sema::CXXCopyAssignment: 4687 IsAssignment = true; 4688 break; 4689 case Sema::CXXMoveAssignment: 4690 IsAssignment = true; 4691 IsMove = true; 4692 break; 4693 case Sema::CXXDestructor: 4694 break; 4695 case Sema::CXXInvalid: 4696 llvm_unreachable("invalid special member kind"); 4697 } 4698 4699 if (MD->getNumParams()) { 4700 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4701 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4702 } 4703 } 4704 4705 bool inUnion() const { return MD->getParent()->isUnion(); } 4706 4707 /// Look up the corresponding special member in the given class. 4708 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4709 unsigned Quals) { 4710 unsigned TQ = MD->getTypeQualifiers(); 4711 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4712 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4713 Quals = 0; 4714 return S.LookupSpecialMember(Class, CSM, 4715 ConstArg || (Quals & Qualifiers::Const), 4716 VolatileArg || (Quals & Qualifiers::Volatile), 4717 MD->getRefQualifier() == RQ_RValue, 4718 TQ & Qualifiers::Const, 4719 TQ & Qualifiers::Volatile); 4720 } 4721 4722 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4723 4724 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4725 bool shouldDeleteForField(FieldDecl *FD); 4726 bool shouldDeleteForAllConstMembers(); 4727 4728 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4729 unsigned Quals); 4730 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4731 Sema::SpecialMemberOverloadResult *SMOR, 4732 bool IsDtorCallInCtor); 4733 4734 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4735}; 4736} 4737 4738/// Is the given special member inaccessible when used on the given 4739/// sub-object. 4740bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4741 CXXMethodDecl *target) { 4742 /// If we're operating on a base class, the object type is the 4743 /// type of this special member. 4744 QualType objectTy; 4745 AccessSpecifier access = target->getAccess(); 4746 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4747 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4748 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4749 4750 // If we're operating on a field, the object type is the type of the field. 4751 } else { 4752 objectTy = S.Context.getTypeDeclType(target->getParent()); 4753 } 4754 4755 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4756} 4757 4758/// Check whether we should delete a special member due to the implicit 4759/// definition containing a call to a special member of a subobject. 4760bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4761 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4762 bool IsDtorCallInCtor) { 4763 CXXMethodDecl *Decl = SMOR->getMethod(); 4764 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4765 4766 int DiagKind = -1; 4767 4768 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4769 DiagKind = !Decl ? 0 : 1; 4770 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4771 DiagKind = 2; 4772 else if (!isAccessible(Subobj, Decl)) 4773 DiagKind = 3; 4774 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4775 !Decl->isTrivial()) { 4776 // A member of a union must have a trivial corresponding special member. 4777 // As a weird special case, a destructor call from a union's constructor 4778 // must be accessible and non-deleted, but need not be trivial. Such a 4779 // destructor is never actually called, but is semantically checked as 4780 // if it were. 4781 DiagKind = 4; 4782 } 4783 4784 if (DiagKind == -1) 4785 return false; 4786 4787 if (Diagnose) { 4788 if (Field) { 4789 S.Diag(Field->getLocation(), 4790 diag::note_deleted_special_member_class_subobject) 4791 << CSM << MD->getParent() << /*IsField*/true 4792 << Field << DiagKind << IsDtorCallInCtor; 4793 } else { 4794 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4795 S.Diag(Base->getLocStart(), 4796 diag::note_deleted_special_member_class_subobject) 4797 << CSM << MD->getParent() << /*IsField*/false 4798 << Base->getType() << DiagKind << IsDtorCallInCtor; 4799 } 4800 4801 if (DiagKind == 1) 4802 S.NoteDeletedFunction(Decl); 4803 // FIXME: Explain inaccessibility if DiagKind == 3. 4804 } 4805 4806 return true; 4807} 4808 4809/// Check whether we should delete a special member function due to having a 4810/// direct or virtual base class or non-static data member of class type M. 4811bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4812 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4813 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4814 4815 // C++11 [class.ctor]p5: 4816 // -- any direct or virtual base class, or non-static data member with no 4817 // brace-or-equal-initializer, has class type M (or array thereof) and 4818 // either M has no default constructor or overload resolution as applied 4819 // to M's default constructor results in an ambiguity or in a function 4820 // that is deleted or inaccessible 4821 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4822 // -- a direct or virtual base class B that cannot be copied/moved because 4823 // overload resolution, as applied to B's corresponding special member, 4824 // results in an ambiguity or a function that is deleted or inaccessible 4825 // from the defaulted special member 4826 // C++11 [class.dtor]p5: 4827 // -- any direct or virtual base class [...] has a type with a destructor 4828 // that is deleted or inaccessible 4829 if (!(CSM == Sema::CXXDefaultConstructor && 4830 Field && Field->hasInClassInitializer()) && 4831 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4832 return true; 4833 4834 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4835 // -- any direct or virtual base class or non-static data member has a 4836 // type with a destructor that is deleted or inaccessible 4837 if (IsConstructor) { 4838 Sema::SpecialMemberOverloadResult *SMOR = 4839 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4840 false, false, false, false, false); 4841 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4842 return true; 4843 } 4844 4845 return false; 4846} 4847 4848/// Check whether we should delete a special member function due to the class 4849/// having a particular direct or virtual base class. 4850bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4851 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4852 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4853} 4854 4855/// Check whether we should delete a special member function due to the class 4856/// having a particular non-static data member. 4857bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4858 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4859 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4860 4861 if (CSM == Sema::CXXDefaultConstructor) { 4862 // For a default constructor, all references must be initialized in-class 4863 // and, if a union, it must have a non-const member. 4864 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4865 if (Diagnose) 4866 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4867 << MD->getParent() << FD << FieldType << /*Reference*/0; 4868 return true; 4869 } 4870 // C++11 [class.ctor]p5: any non-variant non-static data member of 4871 // const-qualified type (or array thereof) with no 4872 // brace-or-equal-initializer does not have a user-provided default 4873 // constructor. 4874 if (!inUnion() && FieldType.isConstQualified() && 4875 !FD->hasInClassInitializer() && 4876 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4877 if (Diagnose) 4878 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4879 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4880 return true; 4881 } 4882 4883 if (inUnion() && !FieldType.isConstQualified()) 4884 AllFieldsAreConst = false; 4885 } else if (CSM == Sema::CXXCopyConstructor) { 4886 // For a copy constructor, data members must not be of rvalue reference 4887 // type. 4888 if (FieldType->isRValueReferenceType()) { 4889 if (Diagnose) 4890 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4891 << MD->getParent() << FD << FieldType; 4892 return true; 4893 } 4894 } else if (IsAssignment) { 4895 // For an assignment operator, data members must not be of reference type. 4896 if (FieldType->isReferenceType()) { 4897 if (Diagnose) 4898 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4899 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4900 return true; 4901 } 4902 if (!FieldRecord && FieldType.isConstQualified()) { 4903 // C++11 [class.copy]p23: 4904 // -- a non-static data member of const non-class type (or array thereof) 4905 if (Diagnose) 4906 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4907 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4908 return true; 4909 } 4910 } 4911 4912 if (FieldRecord) { 4913 // Some additional restrictions exist on the variant members. 4914 if (!inUnion() && FieldRecord->isUnion() && 4915 FieldRecord->isAnonymousStructOrUnion()) { 4916 bool AllVariantFieldsAreConst = true; 4917 4918 // FIXME: Handle anonymous unions declared within anonymous unions. 4919 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4920 UE = FieldRecord->field_end(); 4921 UI != UE; ++UI) { 4922 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4923 4924 if (!UnionFieldType.isConstQualified()) 4925 AllVariantFieldsAreConst = false; 4926 4927 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4928 if (UnionFieldRecord && 4929 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4930 UnionFieldType.getCVRQualifiers())) 4931 return true; 4932 } 4933 4934 // At least one member in each anonymous union must be non-const 4935 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4936 FieldRecord->field_begin() != FieldRecord->field_end()) { 4937 if (Diagnose) 4938 S.Diag(FieldRecord->getLocation(), 4939 diag::note_deleted_default_ctor_all_const) 4940 << MD->getParent() << /*anonymous union*/1; 4941 return true; 4942 } 4943 4944 // Don't check the implicit member of the anonymous union type. 4945 // This is technically non-conformant, but sanity demands it. 4946 return false; 4947 } 4948 4949 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4950 FieldType.getCVRQualifiers())) 4951 return true; 4952 } 4953 4954 return false; 4955} 4956 4957/// C++11 [class.ctor] p5: 4958/// A defaulted default constructor for a class X is defined as deleted if 4959/// X is a union and all of its variant members are of const-qualified type. 4960bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4961 // This is a silly definition, because it gives an empty union a deleted 4962 // default constructor. Don't do that. 4963 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4964 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4965 if (Diagnose) 4966 S.Diag(MD->getParent()->getLocation(), 4967 diag::note_deleted_default_ctor_all_const) 4968 << MD->getParent() << /*not anonymous union*/0; 4969 return true; 4970 } 4971 return false; 4972} 4973 4974/// Determine whether a defaulted special member function should be defined as 4975/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4976/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4977bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4978 bool Diagnose) { 4979 if (MD->isInvalidDecl()) 4980 return false; 4981 CXXRecordDecl *RD = MD->getParent(); 4982 assert(!RD->isDependentType() && "do deletion after instantiation"); 4983 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4984 return false; 4985 4986 // C++11 [expr.lambda.prim]p19: 4987 // The closure type associated with a lambda-expression has a 4988 // deleted (8.4.3) default constructor and a deleted copy 4989 // assignment operator. 4990 if (RD->isLambda() && 4991 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4992 if (Diagnose) 4993 Diag(RD->getLocation(), diag::note_lambda_decl); 4994 return true; 4995 } 4996 4997 // For an anonymous struct or union, the copy and assignment special members 4998 // will never be used, so skip the check. For an anonymous union declared at 4999 // namespace scope, the constructor and destructor are used. 5000 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 5001 RD->isAnonymousStructOrUnion()) 5002 return false; 5003 5004 // C++11 [class.copy]p7, p18: 5005 // If the class definition declares a move constructor or move assignment 5006 // operator, an implicitly declared copy constructor or copy assignment 5007 // operator is defined as deleted. 5008 if (MD->isImplicit() && 5009 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 5010 CXXMethodDecl *UserDeclaredMove = 0; 5011 5012 // In Microsoft mode, a user-declared move only causes the deletion of the 5013 // corresponding copy operation, not both copy operations. 5014 if (RD->hasUserDeclaredMoveConstructor() && 5015 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 5016 if (!Diagnose) return true; 5017 5018 // Find any user-declared move constructor. 5019 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5020 E = RD->ctor_end(); I != E; ++I) { 5021 if (I->isMoveConstructor()) { 5022 UserDeclaredMove = *I; 5023 break; 5024 } 5025 } 5026 assert(UserDeclaredMove); 5027 } else if (RD->hasUserDeclaredMoveAssignment() && 5028 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5029 if (!Diagnose) return true; 5030 5031 // Find any user-declared move assignment operator. 5032 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5033 E = RD->method_end(); I != E; ++I) { 5034 if (I->isMoveAssignmentOperator()) { 5035 UserDeclaredMove = *I; 5036 break; 5037 } 5038 } 5039 assert(UserDeclaredMove); 5040 } 5041 5042 if (UserDeclaredMove) { 5043 Diag(UserDeclaredMove->getLocation(), 5044 diag::note_deleted_copy_user_declared_move) 5045 << (CSM == CXXCopyAssignment) << RD 5046 << UserDeclaredMove->isMoveAssignmentOperator(); 5047 return true; 5048 } 5049 } 5050 5051 // Do access control from the special member function 5052 ContextRAII MethodContext(*this, MD); 5053 5054 // C++11 [class.dtor]p5: 5055 // -- for a virtual destructor, lookup of the non-array deallocation function 5056 // results in an ambiguity or in a function that is deleted or inaccessible 5057 if (CSM == CXXDestructor && MD->isVirtual()) { 5058 FunctionDecl *OperatorDelete = 0; 5059 DeclarationName Name = 5060 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5061 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5062 OperatorDelete, false)) { 5063 if (Diagnose) 5064 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5065 return true; 5066 } 5067 } 5068 5069 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5070 5071 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5072 BE = RD->bases_end(); BI != BE; ++BI) 5073 if (!BI->isVirtual() && 5074 SMI.shouldDeleteForBase(BI)) 5075 return true; 5076 5077 // Per DR1611, do not consider virtual bases of constructors of abstract 5078 // classes, since we are not going to construct them. 5079 if (!RD->isAbstract() || !SMI.IsConstructor) { 5080 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5081 BE = RD->vbases_end(); 5082 BI != BE; ++BI) 5083 if (SMI.shouldDeleteForBase(BI)) 5084 return true; 5085 } 5086 5087 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5088 FE = RD->field_end(); FI != FE; ++FI) 5089 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5090 SMI.shouldDeleteForField(*FI)) 5091 return true; 5092 5093 if (SMI.shouldDeleteForAllConstMembers()) 5094 return true; 5095 5096 return false; 5097} 5098 5099/// Perform lookup for a special member of the specified kind, and determine 5100/// whether it is trivial. If the triviality can be determined without the 5101/// lookup, skip it. This is intended for use when determining whether a 5102/// special member of a containing object is trivial, and thus does not ever 5103/// perform overload resolution for default constructors. 5104/// 5105/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5106/// member that was most likely to be intended to be trivial, if any. 5107static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5108 Sema::CXXSpecialMember CSM, unsigned Quals, 5109 CXXMethodDecl **Selected) { 5110 if (Selected) 5111 *Selected = 0; 5112 5113 switch (CSM) { 5114 case Sema::CXXInvalid: 5115 llvm_unreachable("not a special member"); 5116 5117 case Sema::CXXDefaultConstructor: 5118 // C++11 [class.ctor]p5: 5119 // A default constructor is trivial if: 5120 // - all the [direct subobjects] have trivial default constructors 5121 // 5122 // Note, no overload resolution is performed in this case. 5123 if (RD->hasTrivialDefaultConstructor()) 5124 return true; 5125 5126 if (Selected) { 5127 // If there's a default constructor which could have been trivial, dig it 5128 // out. Otherwise, if there's any user-provided default constructor, point 5129 // to that as an example of why there's not a trivial one. 5130 CXXConstructorDecl *DefCtor = 0; 5131 if (RD->needsImplicitDefaultConstructor()) 5132 S.DeclareImplicitDefaultConstructor(RD); 5133 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5134 CE = RD->ctor_end(); CI != CE; ++CI) { 5135 if (!CI->isDefaultConstructor()) 5136 continue; 5137 DefCtor = *CI; 5138 if (!DefCtor->isUserProvided()) 5139 break; 5140 } 5141 5142 *Selected = DefCtor; 5143 } 5144 5145 return false; 5146 5147 case Sema::CXXDestructor: 5148 // C++11 [class.dtor]p5: 5149 // A destructor is trivial if: 5150 // - all the direct [subobjects] have trivial destructors 5151 if (RD->hasTrivialDestructor()) 5152 return true; 5153 5154 if (Selected) { 5155 if (RD->needsImplicitDestructor()) 5156 S.DeclareImplicitDestructor(RD); 5157 *Selected = RD->getDestructor(); 5158 } 5159 5160 return false; 5161 5162 case Sema::CXXCopyConstructor: 5163 // C++11 [class.copy]p12: 5164 // A copy constructor is trivial if: 5165 // - the constructor selected to copy each direct [subobject] is trivial 5166 if (RD->hasTrivialCopyConstructor()) { 5167 if (Quals == Qualifiers::Const) 5168 // We must either select the trivial copy constructor or reach an 5169 // ambiguity; no need to actually perform overload resolution. 5170 return true; 5171 } else if (!Selected) { 5172 return false; 5173 } 5174 // In C++98, we are not supposed to perform overload resolution here, but we 5175 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5176 // cases like B as having a non-trivial copy constructor: 5177 // struct A { template<typename T> A(T&); }; 5178 // struct B { mutable A a; }; 5179 goto NeedOverloadResolution; 5180 5181 case Sema::CXXCopyAssignment: 5182 // C++11 [class.copy]p25: 5183 // A copy assignment operator is trivial if: 5184 // - the assignment operator selected to copy each direct [subobject] is 5185 // trivial 5186 if (RD->hasTrivialCopyAssignment()) { 5187 if (Quals == Qualifiers::Const) 5188 return true; 5189 } else if (!Selected) { 5190 return false; 5191 } 5192 // In C++98, we are not supposed to perform overload resolution here, but we 5193 // treat that as a language defect. 5194 goto NeedOverloadResolution; 5195 5196 case Sema::CXXMoveConstructor: 5197 case Sema::CXXMoveAssignment: 5198 NeedOverloadResolution: 5199 Sema::SpecialMemberOverloadResult *SMOR = 5200 S.LookupSpecialMember(RD, CSM, 5201 Quals & Qualifiers::Const, 5202 Quals & Qualifiers::Volatile, 5203 /*RValueThis*/false, /*ConstThis*/false, 5204 /*VolatileThis*/false); 5205 5206 // The standard doesn't describe how to behave if the lookup is ambiguous. 5207 // We treat it as not making the member non-trivial, just like the standard 5208 // mandates for the default constructor. This should rarely matter, because 5209 // the member will also be deleted. 5210 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5211 return true; 5212 5213 if (!SMOR->getMethod()) { 5214 assert(SMOR->getKind() == 5215 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5216 return false; 5217 } 5218 5219 // We deliberately don't check if we found a deleted special member. We're 5220 // not supposed to! 5221 if (Selected) 5222 *Selected = SMOR->getMethod(); 5223 return SMOR->getMethod()->isTrivial(); 5224 } 5225 5226 llvm_unreachable("unknown special method kind"); 5227} 5228 5229static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5230 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5231 CI != CE; ++CI) 5232 if (!CI->isImplicit()) 5233 return *CI; 5234 5235 // Look for constructor templates. 5236 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5237 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5238 if (CXXConstructorDecl *CD = 5239 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5240 return CD; 5241 } 5242 5243 return 0; 5244} 5245 5246/// The kind of subobject we are checking for triviality. The values of this 5247/// enumeration are used in diagnostics. 5248enum TrivialSubobjectKind { 5249 /// The subobject is a base class. 5250 TSK_BaseClass, 5251 /// The subobject is a non-static data member. 5252 TSK_Field, 5253 /// The object is actually the complete object. 5254 TSK_CompleteObject 5255}; 5256 5257/// Check whether the special member selected for a given type would be trivial. 5258static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5259 QualType SubType, 5260 Sema::CXXSpecialMember CSM, 5261 TrivialSubobjectKind Kind, 5262 bool Diagnose) { 5263 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5264 if (!SubRD) 5265 return true; 5266 5267 CXXMethodDecl *Selected; 5268 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5269 Diagnose ? &Selected : 0)) 5270 return true; 5271 5272 if (Diagnose) { 5273 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5274 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5275 << Kind << SubType.getUnqualifiedType(); 5276 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5277 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5278 } else if (!Selected) 5279 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5280 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5281 else if (Selected->isUserProvided()) { 5282 if (Kind == TSK_CompleteObject) 5283 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5284 << Kind << SubType.getUnqualifiedType() << CSM; 5285 else { 5286 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5287 << Kind << SubType.getUnqualifiedType() << CSM; 5288 S.Diag(Selected->getLocation(), diag::note_declared_at); 5289 } 5290 } else { 5291 if (Kind != TSK_CompleteObject) 5292 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5293 << Kind << SubType.getUnqualifiedType() << CSM; 5294 5295 // Explain why the defaulted or deleted special member isn't trivial. 5296 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5297 } 5298 } 5299 5300 return false; 5301} 5302 5303/// Check whether the members of a class type allow a special member to be 5304/// trivial. 5305static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5306 Sema::CXXSpecialMember CSM, 5307 bool ConstArg, bool Diagnose) { 5308 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5309 FE = RD->field_end(); FI != FE; ++FI) { 5310 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5311 continue; 5312 5313 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5314 5315 // Pretend anonymous struct or union members are members of this class. 5316 if (FI->isAnonymousStructOrUnion()) { 5317 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5318 CSM, ConstArg, Diagnose)) 5319 return false; 5320 continue; 5321 } 5322 5323 // C++11 [class.ctor]p5: 5324 // A default constructor is trivial if [...] 5325 // -- no non-static data member of its class has a 5326 // brace-or-equal-initializer 5327 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5328 if (Diagnose) 5329 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5330 return false; 5331 } 5332 5333 // Objective C ARC 4.3.5: 5334 // [...] nontrivally ownership-qualified types are [...] not trivially 5335 // default constructible, copy constructible, move constructible, copy 5336 // assignable, move assignable, or destructible [...] 5337 if (S.getLangOpts().ObjCAutoRefCount && 5338 FieldType.hasNonTrivialObjCLifetime()) { 5339 if (Diagnose) 5340 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5341 << RD << FieldType.getObjCLifetime(); 5342 return false; 5343 } 5344 5345 if (ConstArg && !FI->isMutable()) 5346 FieldType.addConst(); 5347 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5348 TSK_Field, Diagnose)) 5349 return false; 5350 } 5351 5352 return true; 5353} 5354 5355/// Diagnose why the specified class does not have a trivial special member of 5356/// the given kind. 5357void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5358 QualType Ty = Context.getRecordType(RD); 5359 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5360 Ty.addConst(); 5361 5362 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5363 TSK_CompleteObject, /*Diagnose*/true); 5364} 5365 5366/// Determine whether a defaulted or deleted special member function is trivial, 5367/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5368/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5369bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5370 bool Diagnose) { 5371 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5372 5373 CXXRecordDecl *RD = MD->getParent(); 5374 5375 bool ConstArg = false; 5376 5377 // C++11 [class.copy]p12, p25: 5378 // A [special member] is trivial if its declared parameter type is the same 5379 // as if it had been implicitly declared [...] 5380 switch (CSM) { 5381 case CXXDefaultConstructor: 5382 case CXXDestructor: 5383 // Trivial default constructors and destructors cannot have parameters. 5384 break; 5385 5386 case CXXCopyConstructor: 5387 case CXXCopyAssignment: { 5388 // Trivial copy operations always have const, non-volatile parameter types. 5389 ConstArg = true; 5390 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5391 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5392 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5393 if (Diagnose) 5394 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5395 << Param0->getSourceRange() << Param0->getType() 5396 << Context.getLValueReferenceType( 5397 Context.getRecordType(RD).withConst()); 5398 return false; 5399 } 5400 break; 5401 } 5402 5403 case CXXMoveConstructor: 5404 case CXXMoveAssignment: { 5405 // Trivial move operations always have non-cv-qualified parameters. 5406 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5407 const RValueReferenceType *RT = 5408 Param0->getType()->getAs<RValueReferenceType>(); 5409 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5410 if (Diagnose) 5411 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5412 << Param0->getSourceRange() << Param0->getType() 5413 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5414 return false; 5415 } 5416 break; 5417 } 5418 5419 case CXXInvalid: 5420 llvm_unreachable("not a special member"); 5421 } 5422 5423 // FIXME: We require that the parameter-declaration-clause is equivalent to 5424 // that of an implicit declaration, not just that the declared parameter type 5425 // matches, in order to prevent absuridities like a function simultaneously 5426 // being a trivial copy constructor and a non-trivial default constructor. 5427 // This issue has not yet been assigned a core issue number. 5428 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5429 if (Diagnose) 5430 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5431 diag::note_nontrivial_default_arg) 5432 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5433 return false; 5434 } 5435 if (MD->isVariadic()) { 5436 if (Diagnose) 5437 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5438 return false; 5439 } 5440 5441 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5442 // A copy/move [constructor or assignment operator] is trivial if 5443 // -- the [member] selected to copy/move each direct base class subobject 5444 // is trivial 5445 // 5446 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5447 // A [default constructor or destructor] is trivial if 5448 // -- all the direct base classes have trivial [default constructors or 5449 // destructors] 5450 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5451 BE = RD->bases_end(); BI != BE; ++BI) 5452 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5453 ConstArg ? BI->getType().withConst() 5454 : BI->getType(), 5455 CSM, TSK_BaseClass, Diagnose)) 5456 return false; 5457 5458 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5459 // A copy/move [constructor or assignment operator] for a class X is 5460 // trivial if 5461 // -- for each non-static data member of X that is of class type (or array 5462 // thereof), the constructor selected to copy/move that member is 5463 // trivial 5464 // 5465 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5466 // A [default constructor or destructor] is trivial if 5467 // -- for all of the non-static data members of its class that are of class 5468 // type (or array thereof), each such class has a trivial [default 5469 // constructor or destructor] 5470 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5471 return false; 5472 5473 // C++11 [class.dtor]p5: 5474 // A destructor is trivial if [...] 5475 // -- the destructor is not virtual 5476 if (CSM == CXXDestructor && MD->isVirtual()) { 5477 if (Diagnose) 5478 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5479 return false; 5480 } 5481 5482 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5483 // A [special member] for class X is trivial if [...] 5484 // -- class X has no virtual functions and no virtual base classes 5485 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5486 if (!Diagnose) 5487 return false; 5488 5489 if (RD->getNumVBases()) { 5490 // Check for virtual bases. We already know that the corresponding 5491 // member in all bases is trivial, so vbases must all be direct. 5492 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5493 assert(BS.isVirtual()); 5494 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5495 return false; 5496 } 5497 5498 // Must have a virtual method. 5499 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5500 ME = RD->method_end(); MI != ME; ++MI) { 5501 if (MI->isVirtual()) { 5502 SourceLocation MLoc = MI->getLocStart(); 5503 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5504 return false; 5505 } 5506 } 5507 5508 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5509 } 5510 5511 // Looks like it's trivial! 5512 return true; 5513} 5514 5515/// \brief Data used with FindHiddenVirtualMethod 5516namespace { 5517 struct FindHiddenVirtualMethodData { 5518 Sema *S; 5519 CXXMethodDecl *Method; 5520 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5521 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5522 }; 5523} 5524 5525/// \brief Check whether any most overriden method from MD in Methods 5526static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5527 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5528 if (MD->size_overridden_methods() == 0) 5529 return Methods.count(MD->getCanonicalDecl()); 5530 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5531 E = MD->end_overridden_methods(); 5532 I != E; ++I) 5533 if (CheckMostOverridenMethods(*I, Methods)) 5534 return true; 5535 return false; 5536} 5537 5538/// \brief Member lookup function that determines whether a given C++ 5539/// method overloads virtual methods in a base class without overriding any, 5540/// to be used with CXXRecordDecl::lookupInBases(). 5541static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5542 CXXBasePath &Path, 5543 void *UserData) { 5544 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5545 5546 FindHiddenVirtualMethodData &Data 5547 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5548 5549 DeclarationName Name = Data.Method->getDeclName(); 5550 assert(Name.getNameKind() == DeclarationName::Identifier); 5551 5552 bool foundSameNameMethod = false; 5553 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5554 for (Path.Decls = BaseRecord->lookup(Name); 5555 !Path.Decls.empty(); 5556 Path.Decls = Path.Decls.slice(1)) { 5557 NamedDecl *D = Path.Decls.front(); 5558 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5559 MD = MD->getCanonicalDecl(); 5560 foundSameNameMethod = true; 5561 // Interested only in hidden virtual methods. 5562 if (!MD->isVirtual()) 5563 continue; 5564 // If the method we are checking overrides a method from its base 5565 // don't warn about the other overloaded methods. 5566 if (!Data.S->IsOverload(Data.Method, MD, false)) 5567 return true; 5568 // Collect the overload only if its hidden. 5569 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5570 overloadedMethods.push_back(MD); 5571 } 5572 } 5573 5574 if (foundSameNameMethod) 5575 Data.OverloadedMethods.append(overloadedMethods.begin(), 5576 overloadedMethods.end()); 5577 return foundSameNameMethod; 5578} 5579 5580/// \brief Add the most overriden methods from MD to Methods 5581static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5582 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5583 if (MD->size_overridden_methods() == 0) 5584 Methods.insert(MD->getCanonicalDecl()); 5585 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5586 E = MD->end_overridden_methods(); 5587 I != E; ++I) 5588 AddMostOverridenMethods(*I, Methods); 5589} 5590 5591/// \brief See if a method overloads virtual methods in a base class without 5592/// overriding any. 5593void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5594 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5595 MD->getLocation()) == DiagnosticsEngine::Ignored) 5596 return; 5597 if (!MD->getDeclName().isIdentifier()) 5598 return; 5599 5600 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5601 /*bool RecordPaths=*/false, 5602 /*bool DetectVirtual=*/false); 5603 FindHiddenVirtualMethodData Data; 5604 Data.Method = MD; 5605 Data.S = this; 5606 5607 // Keep the base methods that were overriden or introduced in the subclass 5608 // by 'using' in a set. A base method not in this set is hidden. 5609 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5610 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5611 NamedDecl *ND = *I; 5612 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5613 ND = shad->getTargetDecl(); 5614 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5615 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5616 } 5617 5618 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5619 !Data.OverloadedMethods.empty()) { 5620 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5621 << MD << (Data.OverloadedMethods.size() > 1); 5622 5623 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5624 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5625 PartialDiagnostic PD = PDiag( 5626 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5627 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5628 Diag(overloadedMD->getLocation(), PD); 5629 } 5630 } 5631} 5632 5633void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5634 Decl *TagDecl, 5635 SourceLocation LBrac, 5636 SourceLocation RBrac, 5637 AttributeList *AttrList) { 5638 if (!TagDecl) 5639 return; 5640 5641 AdjustDeclIfTemplate(TagDecl); 5642 5643 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5644 if (l->getKind() != AttributeList::AT_Visibility) 5645 continue; 5646 l->setInvalid(); 5647 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5648 l->getName(); 5649 } 5650 5651 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5652 // strict aliasing violation! 5653 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5654 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5655 5656 CheckCompletedCXXClass( 5657 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5658} 5659 5660/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5661/// special functions, such as the default constructor, copy 5662/// constructor, or destructor, to the given C++ class (C++ 5663/// [special]p1). This routine can only be executed just before the 5664/// definition of the class is complete. 5665void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5666 if (!ClassDecl->hasUserDeclaredConstructor()) 5667 ++ASTContext::NumImplicitDefaultConstructors; 5668 5669 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5670 ++ASTContext::NumImplicitCopyConstructors; 5671 5672 // If the properties or semantics of the copy constructor couldn't be 5673 // determined while the class was being declared, force a declaration 5674 // of it now. 5675 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5676 DeclareImplicitCopyConstructor(ClassDecl); 5677 } 5678 5679 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5680 ++ASTContext::NumImplicitMoveConstructors; 5681 5682 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5683 DeclareImplicitMoveConstructor(ClassDecl); 5684 } 5685 5686 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5687 ++ASTContext::NumImplicitCopyAssignmentOperators; 5688 5689 // If we have a dynamic class, then the copy assignment operator may be 5690 // virtual, so we have to declare it immediately. This ensures that, e.g., 5691 // it shows up in the right place in the vtable and that we diagnose 5692 // problems with the implicit exception specification. 5693 if (ClassDecl->isDynamicClass() || 5694 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5695 DeclareImplicitCopyAssignment(ClassDecl); 5696 } 5697 5698 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5699 ++ASTContext::NumImplicitMoveAssignmentOperators; 5700 5701 // Likewise for the move assignment operator. 5702 if (ClassDecl->isDynamicClass() || 5703 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5704 DeclareImplicitMoveAssignment(ClassDecl); 5705 } 5706 5707 if (!ClassDecl->hasUserDeclaredDestructor()) { 5708 ++ASTContext::NumImplicitDestructors; 5709 5710 // If we have a dynamic class, then the destructor may be virtual, so we 5711 // have to declare the destructor immediately. This ensures that, e.g., it 5712 // shows up in the right place in the vtable and that we diagnose problems 5713 // with the implicit exception specification. 5714 if (ClassDecl->isDynamicClass() || 5715 ClassDecl->needsOverloadResolutionForDestructor()) 5716 DeclareImplicitDestructor(ClassDecl); 5717 } 5718} 5719 5720void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5721 if (!D) 5722 return; 5723 5724 int NumParamList = D->getNumTemplateParameterLists(); 5725 for (int i = 0; i < NumParamList; i++) { 5726 TemplateParameterList* Params = D->getTemplateParameterList(i); 5727 for (TemplateParameterList::iterator Param = Params->begin(), 5728 ParamEnd = Params->end(); 5729 Param != ParamEnd; ++Param) { 5730 NamedDecl *Named = cast<NamedDecl>(*Param); 5731 if (Named->getDeclName()) { 5732 S->AddDecl(Named); 5733 IdResolver.AddDecl(Named); 5734 } 5735 } 5736 } 5737} 5738 5739void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5740 if (!D) 5741 return; 5742 5743 TemplateParameterList *Params = 0; 5744 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5745 Params = Template->getTemplateParameters(); 5746 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5747 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5748 Params = PartialSpec->getTemplateParameters(); 5749 else 5750 return; 5751 5752 for (TemplateParameterList::iterator Param = Params->begin(), 5753 ParamEnd = Params->end(); 5754 Param != ParamEnd; ++Param) { 5755 NamedDecl *Named = cast<NamedDecl>(*Param); 5756 if (Named->getDeclName()) { 5757 S->AddDecl(Named); 5758 IdResolver.AddDecl(Named); 5759 } 5760 } 5761} 5762 5763void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5764 if (!RecordD) return; 5765 AdjustDeclIfTemplate(RecordD); 5766 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5767 PushDeclContext(S, Record); 5768} 5769 5770void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5771 if (!RecordD) return; 5772 PopDeclContext(); 5773} 5774 5775/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5776/// parsing a top-level (non-nested) C++ class, and we are now 5777/// parsing those parts of the given Method declaration that could 5778/// not be parsed earlier (C++ [class.mem]p2), such as default 5779/// arguments. This action should enter the scope of the given 5780/// Method declaration as if we had just parsed the qualified method 5781/// name. However, it should not bring the parameters into scope; 5782/// that will be performed by ActOnDelayedCXXMethodParameter. 5783void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5784} 5785 5786/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5787/// C++ method declaration. We're (re-)introducing the given 5788/// function parameter into scope for use in parsing later parts of 5789/// the method declaration. For example, we could see an 5790/// ActOnParamDefaultArgument event for this parameter. 5791void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5792 if (!ParamD) 5793 return; 5794 5795 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5796 5797 // If this parameter has an unparsed default argument, clear it out 5798 // to make way for the parsed default argument. 5799 if (Param->hasUnparsedDefaultArg()) 5800 Param->setDefaultArg(0); 5801 5802 S->AddDecl(Param); 5803 if (Param->getDeclName()) 5804 IdResolver.AddDecl(Param); 5805} 5806 5807/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5808/// processing the delayed method declaration for Method. The method 5809/// declaration is now considered finished. There may be a separate 5810/// ActOnStartOfFunctionDef action later (not necessarily 5811/// immediately!) for this method, if it was also defined inside the 5812/// class body. 5813void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5814 if (!MethodD) 5815 return; 5816 5817 AdjustDeclIfTemplate(MethodD); 5818 5819 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5820 5821 // Now that we have our default arguments, check the constructor 5822 // again. It could produce additional diagnostics or affect whether 5823 // the class has implicitly-declared destructors, among other 5824 // things. 5825 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5826 CheckConstructor(Constructor); 5827 5828 // Check the default arguments, which we may have added. 5829 if (!Method->isInvalidDecl()) 5830 CheckCXXDefaultArguments(Method); 5831} 5832 5833/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5834/// the well-formedness of the constructor declarator @p D with type @p 5835/// R. If there are any errors in the declarator, this routine will 5836/// emit diagnostics and set the invalid bit to true. In any case, the type 5837/// will be updated to reflect a well-formed type for the constructor and 5838/// returned. 5839QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5840 StorageClass &SC) { 5841 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5842 5843 // C++ [class.ctor]p3: 5844 // A constructor shall not be virtual (10.3) or static (9.4). A 5845 // constructor can be invoked for a const, volatile or const 5846 // volatile object. A constructor shall not be declared const, 5847 // volatile, or const volatile (9.3.2). 5848 if (isVirtual) { 5849 if (!D.isInvalidType()) 5850 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5851 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5852 << SourceRange(D.getIdentifierLoc()); 5853 D.setInvalidType(); 5854 } 5855 if (SC == SC_Static) { 5856 if (!D.isInvalidType()) 5857 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5858 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5859 << SourceRange(D.getIdentifierLoc()); 5860 D.setInvalidType(); 5861 SC = SC_None; 5862 } 5863 5864 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5865 if (FTI.TypeQuals != 0) { 5866 if (FTI.TypeQuals & Qualifiers::Const) 5867 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5868 << "const" << SourceRange(D.getIdentifierLoc()); 5869 if (FTI.TypeQuals & Qualifiers::Volatile) 5870 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5871 << "volatile" << SourceRange(D.getIdentifierLoc()); 5872 if (FTI.TypeQuals & Qualifiers::Restrict) 5873 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5874 << "restrict" << SourceRange(D.getIdentifierLoc()); 5875 D.setInvalidType(); 5876 } 5877 5878 // C++0x [class.ctor]p4: 5879 // A constructor shall not be declared with a ref-qualifier. 5880 if (FTI.hasRefQualifier()) { 5881 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5882 << FTI.RefQualifierIsLValueRef 5883 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5884 D.setInvalidType(); 5885 } 5886 5887 // Rebuild the function type "R" without any type qualifiers (in 5888 // case any of the errors above fired) and with "void" as the 5889 // return type, since constructors don't have return types. 5890 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5891 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5892 return R; 5893 5894 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5895 EPI.TypeQuals = 0; 5896 EPI.RefQualifier = RQ_None; 5897 5898 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5899} 5900 5901/// CheckConstructor - Checks a fully-formed constructor for 5902/// well-formedness, issuing any diagnostics required. Returns true if 5903/// the constructor declarator is invalid. 5904void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5905 CXXRecordDecl *ClassDecl 5906 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5907 if (!ClassDecl) 5908 return Constructor->setInvalidDecl(); 5909 5910 // C++ [class.copy]p3: 5911 // A declaration of a constructor for a class X is ill-formed if 5912 // its first parameter is of type (optionally cv-qualified) X and 5913 // either there are no other parameters or else all other 5914 // parameters have default arguments. 5915 if (!Constructor->isInvalidDecl() && 5916 ((Constructor->getNumParams() == 1) || 5917 (Constructor->getNumParams() > 1 && 5918 Constructor->getParamDecl(1)->hasDefaultArg())) && 5919 Constructor->getTemplateSpecializationKind() 5920 != TSK_ImplicitInstantiation) { 5921 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5922 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5923 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5924 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5925 const char *ConstRef 5926 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5927 : " const &"; 5928 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5929 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5930 5931 // FIXME: Rather that making the constructor invalid, we should endeavor 5932 // to fix the type. 5933 Constructor->setInvalidDecl(); 5934 } 5935 } 5936} 5937 5938/// CheckDestructor - Checks a fully-formed destructor definition for 5939/// well-formedness, issuing any diagnostics required. Returns true 5940/// on error. 5941bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5942 CXXRecordDecl *RD = Destructor->getParent(); 5943 5944 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 5945 SourceLocation Loc; 5946 5947 if (!Destructor->isImplicit()) 5948 Loc = Destructor->getLocation(); 5949 else 5950 Loc = RD->getLocation(); 5951 5952 // If we have a virtual destructor, look up the deallocation function 5953 FunctionDecl *OperatorDelete = 0; 5954 DeclarationName Name = 5955 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5956 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5957 return true; 5958 5959 MarkFunctionReferenced(Loc, OperatorDelete); 5960 5961 Destructor->setOperatorDelete(OperatorDelete); 5962 } 5963 5964 return false; 5965} 5966 5967static inline bool 5968FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5969 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5970 FTI.ArgInfo[0].Param && 5971 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5972} 5973 5974/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5975/// the well-formednes of the destructor declarator @p D with type @p 5976/// R. If there are any errors in the declarator, this routine will 5977/// emit diagnostics and set the declarator to invalid. Even if this happens, 5978/// will be updated to reflect a well-formed type for the destructor and 5979/// returned. 5980QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5981 StorageClass& SC) { 5982 // C++ [class.dtor]p1: 5983 // [...] A typedef-name that names a class is a class-name 5984 // (7.1.3); however, a typedef-name that names a class shall not 5985 // be used as the identifier in the declarator for a destructor 5986 // declaration. 5987 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5988 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5989 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5990 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5991 else if (const TemplateSpecializationType *TST = 5992 DeclaratorType->getAs<TemplateSpecializationType>()) 5993 if (TST->isTypeAlias()) 5994 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5995 << DeclaratorType << 1; 5996 5997 // C++ [class.dtor]p2: 5998 // A destructor is used to destroy objects of its class type. A 5999 // destructor takes no parameters, and no return type can be 6000 // specified for it (not even void). The address of a destructor 6001 // shall not be taken. A destructor shall not be static. A 6002 // destructor can be invoked for a const, volatile or const 6003 // volatile object. A destructor shall not be declared const, 6004 // volatile or const volatile (9.3.2). 6005 if (SC == SC_Static) { 6006 if (!D.isInvalidType()) 6007 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 6008 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6009 << SourceRange(D.getIdentifierLoc()) 6010 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6011 6012 SC = SC_None; 6013 } 6014 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6015 // Destructors don't have return types, but the parser will 6016 // happily parse something like: 6017 // 6018 // class X { 6019 // float ~X(); 6020 // }; 6021 // 6022 // The return type will be eliminated later. 6023 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6024 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6025 << SourceRange(D.getIdentifierLoc()); 6026 } 6027 6028 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6029 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6030 if (FTI.TypeQuals & Qualifiers::Const) 6031 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6032 << "const" << SourceRange(D.getIdentifierLoc()); 6033 if (FTI.TypeQuals & Qualifiers::Volatile) 6034 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6035 << "volatile" << SourceRange(D.getIdentifierLoc()); 6036 if (FTI.TypeQuals & Qualifiers::Restrict) 6037 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6038 << "restrict" << SourceRange(D.getIdentifierLoc()); 6039 D.setInvalidType(); 6040 } 6041 6042 // C++0x [class.dtor]p2: 6043 // A destructor shall not be declared with a ref-qualifier. 6044 if (FTI.hasRefQualifier()) { 6045 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6046 << FTI.RefQualifierIsLValueRef 6047 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6048 D.setInvalidType(); 6049 } 6050 6051 // Make sure we don't have any parameters. 6052 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6053 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6054 6055 // Delete the parameters. 6056 FTI.freeArgs(); 6057 D.setInvalidType(); 6058 } 6059 6060 // Make sure the destructor isn't variadic. 6061 if (FTI.isVariadic) { 6062 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6063 D.setInvalidType(); 6064 } 6065 6066 // Rebuild the function type "R" without any type qualifiers or 6067 // parameters (in case any of the errors above fired) and with 6068 // "void" as the return type, since destructors don't have return 6069 // types. 6070 if (!D.isInvalidType()) 6071 return R; 6072 6073 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6074 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6075 EPI.Variadic = false; 6076 EPI.TypeQuals = 0; 6077 EPI.RefQualifier = RQ_None; 6078 return Context.getFunctionType(Context.VoidTy, None, EPI); 6079} 6080 6081/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6082/// well-formednes of the conversion function declarator @p D with 6083/// type @p R. If there are any errors in the declarator, this routine 6084/// will emit diagnostics and return true. Otherwise, it will return 6085/// false. Either way, the type @p R will be updated to reflect a 6086/// well-formed type for the conversion operator. 6087void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6088 StorageClass& SC) { 6089 // C++ [class.conv.fct]p1: 6090 // Neither parameter types nor return type can be specified. The 6091 // type of a conversion function (8.3.5) is "function taking no 6092 // parameter returning conversion-type-id." 6093 if (SC == SC_Static) { 6094 if (!D.isInvalidType()) 6095 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6096 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6097 << D.getName().getSourceRange(); 6098 D.setInvalidType(); 6099 SC = SC_None; 6100 } 6101 6102 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6103 6104 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6105 // Conversion functions don't have return types, but the parser will 6106 // happily parse something like: 6107 // 6108 // class X { 6109 // float operator bool(); 6110 // }; 6111 // 6112 // The return type will be changed later anyway. 6113 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6114 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6115 << SourceRange(D.getIdentifierLoc()); 6116 D.setInvalidType(); 6117 } 6118 6119 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6120 6121 // Make sure we don't have any parameters. 6122 if (Proto->getNumArgs() > 0) { 6123 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6124 6125 // Delete the parameters. 6126 D.getFunctionTypeInfo().freeArgs(); 6127 D.setInvalidType(); 6128 } else if (Proto->isVariadic()) { 6129 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6130 D.setInvalidType(); 6131 } 6132 6133 // Diagnose "&operator bool()" and other such nonsense. This 6134 // is actually a gcc extension which we don't support. 6135 if (Proto->getResultType() != ConvType) { 6136 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6137 << Proto->getResultType(); 6138 D.setInvalidType(); 6139 ConvType = Proto->getResultType(); 6140 } 6141 6142 // C++ [class.conv.fct]p4: 6143 // The conversion-type-id shall not represent a function type nor 6144 // an array type. 6145 if (ConvType->isArrayType()) { 6146 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6147 ConvType = Context.getPointerType(ConvType); 6148 D.setInvalidType(); 6149 } else if (ConvType->isFunctionType()) { 6150 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6151 ConvType = Context.getPointerType(ConvType); 6152 D.setInvalidType(); 6153 } 6154 6155 // Rebuild the function type "R" without any parameters (in case any 6156 // of the errors above fired) and with the conversion type as the 6157 // return type. 6158 if (D.isInvalidType()) 6159 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6160 6161 // C++0x explicit conversion operators. 6162 if (D.getDeclSpec().isExplicitSpecified()) 6163 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6164 getLangOpts().CPlusPlus11 ? 6165 diag::warn_cxx98_compat_explicit_conversion_functions : 6166 diag::ext_explicit_conversion_functions) 6167 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6168} 6169 6170/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6171/// the declaration of the given C++ conversion function. This routine 6172/// is responsible for recording the conversion function in the C++ 6173/// class, if possible. 6174Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6175 assert(Conversion && "Expected to receive a conversion function declaration"); 6176 6177 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6178 6179 // Make sure we aren't redeclaring the conversion function. 6180 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6181 6182 // C++ [class.conv.fct]p1: 6183 // [...] A conversion function is never used to convert a 6184 // (possibly cv-qualified) object to the (possibly cv-qualified) 6185 // same object type (or a reference to it), to a (possibly 6186 // cv-qualified) base class of that type (or a reference to it), 6187 // or to (possibly cv-qualified) void. 6188 // FIXME: Suppress this warning if the conversion function ends up being a 6189 // virtual function that overrides a virtual function in a base class. 6190 QualType ClassType 6191 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6192 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6193 ConvType = ConvTypeRef->getPointeeType(); 6194 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6195 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6196 /* Suppress diagnostics for instantiations. */; 6197 else if (ConvType->isRecordType()) { 6198 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6199 if (ConvType == ClassType) 6200 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6201 << ClassType; 6202 else if (IsDerivedFrom(ClassType, ConvType)) 6203 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6204 << ClassType << ConvType; 6205 } else if (ConvType->isVoidType()) { 6206 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6207 << ClassType << ConvType; 6208 } 6209 6210 if (FunctionTemplateDecl *ConversionTemplate 6211 = Conversion->getDescribedFunctionTemplate()) 6212 return ConversionTemplate; 6213 6214 return Conversion; 6215} 6216 6217//===----------------------------------------------------------------------===// 6218// Namespace Handling 6219//===----------------------------------------------------------------------===// 6220 6221/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6222/// reopened. 6223static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6224 SourceLocation Loc, 6225 IdentifierInfo *II, bool *IsInline, 6226 NamespaceDecl *PrevNS) { 6227 assert(*IsInline != PrevNS->isInline()); 6228 6229 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6230 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6231 // inline namespaces, with the intention of bringing names into namespace std. 6232 // 6233 // We support this just well enough to get that case working; this is not 6234 // sufficient to support reopening namespaces as inline in general. 6235 if (*IsInline && II && II->getName().startswith("__atomic") && 6236 S.getSourceManager().isInSystemHeader(Loc)) { 6237 // Mark all prior declarations of the namespace as inline. 6238 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6239 NS = NS->getPreviousDecl()) 6240 NS->setInline(*IsInline); 6241 // Patch up the lookup table for the containing namespace. This isn't really 6242 // correct, but it's good enough for this particular case. 6243 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6244 E = PrevNS->decls_end(); I != E; ++I) 6245 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6246 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6247 return; 6248 } 6249 6250 if (PrevNS->isInline()) 6251 // The user probably just forgot the 'inline', so suggest that it 6252 // be added back. 6253 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6254 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6255 else 6256 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6257 << IsInline; 6258 6259 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6260 *IsInline = PrevNS->isInline(); 6261} 6262 6263/// ActOnStartNamespaceDef - This is called at the start of a namespace 6264/// definition. 6265Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6266 SourceLocation InlineLoc, 6267 SourceLocation NamespaceLoc, 6268 SourceLocation IdentLoc, 6269 IdentifierInfo *II, 6270 SourceLocation LBrace, 6271 AttributeList *AttrList) { 6272 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6273 // For anonymous namespace, take the location of the left brace. 6274 SourceLocation Loc = II ? IdentLoc : LBrace; 6275 bool IsInline = InlineLoc.isValid(); 6276 bool IsInvalid = false; 6277 bool IsStd = false; 6278 bool AddToKnown = false; 6279 Scope *DeclRegionScope = NamespcScope->getParent(); 6280 6281 NamespaceDecl *PrevNS = 0; 6282 if (II) { 6283 // C++ [namespace.def]p2: 6284 // The identifier in an original-namespace-definition shall not 6285 // have been previously defined in the declarative region in 6286 // which the original-namespace-definition appears. The 6287 // identifier in an original-namespace-definition is the name of 6288 // the namespace. Subsequently in that declarative region, it is 6289 // treated as an original-namespace-name. 6290 // 6291 // Since namespace names are unique in their scope, and we don't 6292 // look through using directives, just look for any ordinary names. 6293 6294 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6295 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6296 Decl::IDNS_Namespace; 6297 NamedDecl *PrevDecl = 0; 6298 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6299 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6300 ++I) { 6301 if ((*I)->getIdentifierNamespace() & IDNS) { 6302 PrevDecl = *I; 6303 break; 6304 } 6305 } 6306 6307 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6308 6309 if (PrevNS) { 6310 // This is an extended namespace definition. 6311 if (IsInline != PrevNS->isInline()) 6312 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6313 &IsInline, PrevNS); 6314 } else if (PrevDecl) { 6315 // This is an invalid name redefinition. 6316 Diag(Loc, diag::err_redefinition_different_kind) 6317 << II; 6318 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6319 IsInvalid = true; 6320 // Continue on to push Namespc as current DeclContext and return it. 6321 } else if (II->isStr("std") && 6322 CurContext->getRedeclContext()->isTranslationUnit()) { 6323 // This is the first "real" definition of the namespace "std", so update 6324 // our cache of the "std" namespace to point at this definition. 6325 PrevNS = getStdNamespace(); 6326 IsStd = true; 6327 AddToKnown = !IsInline; 6328 } else { 6329 // We've seen this namespace for the first time. 6330 AddToKnown = !IsInline; 6331 } 6332 } else { 6333 // Anonymous namespaces. 6334 6335 // Determine whether the parent already has an anonymous namespace. 6336 DeclContext *Parent = CurContext->getRedeclContext(); 6337 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6338 PrevNS = TU->getAnonymousNamespace(); 6339 } else { 6340 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6341 PrevNS = ND->getAnonymousNamespace(); 6342 } 6343 6344 if (PrevNS && IsInline != PrevNS->isInline()) 6345 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6346 &IsInline, PrevNS); 6347 } 6348 6349 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6350 StartLoc, Loc, II, PrevNS); 6351 if (IsInvalid) 6352 Namespc->setInvalidDecl(); 6353 6354 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6355 6356 // FIXME: Should we be merging attributes? 6357 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6358 PushNamespaceVisibilityAttr(Attr, Loc); 6359 6360 if (IsStd) 6361 StdNamespace = Namespc; 6362 if (AddToKnown) 6363 KnownNamespaces[Namespc] = false; 6364 6365 if (II) { 6366 PushOnScopeChains(Namespc, DeclRegionScope); 6367 } else { 6368 // Link the anonymous namespace into its parent. 6369 DeclContext *Parent = CurContext->getRedeclContext(); 6370 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6371 TU->setAnonymousNamespace(Namespc); 6372 } else { 6373 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6374 } 6375 6376 CurContext->addDecl(Namespc); 6377 6378 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6379 // behaves as if it were replaced by 6380 // namespace unique { /* empty body */ } 6381 // using namespace unique; 6382 // namespace unique { namespace-body } 6383 // where all occurrences of 'unique' in a translation unit are 6384 // replaced by the same identifier and this identifier differs 6385 // from all other identifiers in the entire program. 6386 6387 // We just create the namespace with an empty name and then add an 6388 // implicit using declaration, just like the standard suggests. 6389 // 6390 // CodeGen enforces the "universally unique" aspect by giving all 6391 // declarations semantically contained within an anonymous 6392 // namespace internal linkage. 6393 6394 if (!PrevNS) { 6395 UsingDirectiveDecl* UD 6396 = UsingDirectiveDecl::Create(Context, Parent, 6397 /* 'using' */ LBrace, 6398 /* 'namespace' */ SourceLocation(), 6399 /* qualifier */ NestedNameSpecifierLoc(), 6400 /* identifier */ SourceLocation(), 6401 Namespc, 6402 /* Ancestor */ Parent); 6403 UD->setImplicit(); 6404 Parent->addDecl(UD); 6405 } 6406 } 6407 6408 ActOnDocumentableDecl(Namespc); 6409 6410 // Although we could have an invalid decl (i.e. the namespace name is a 6411 // redefinition), push it as current DeclContext and try to continue parsing. 6412 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6413 // for the namespace has the declarations that showed up in that particular 6414 // namespace definition. 6415 PushDeclContext(NamespcScope, Namespc); 6416 return Namespc; 6417} 6418 6419/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6420/// is a namespace alias, returns the namespace it points to. 6421static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6422 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6423 return AD->getNamespace(); 6424 return dyn_cast_or_null<NamespaceDecl>(D); 6425} 6426 6427/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6428/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6429void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6430 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6431 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6432 Namespc->setRBraceLoc(RBrace); 6433 PopDeclContext(); 6434 if (Namespc->hasAttr<VisibilityAttr>()) 6435 PopPragmaVisibility(true, RBrace); 6436} 6437 6438CXXRecordDecl *Sema::getStdBadAlloc() const { 6439 return cast_or_null<CXXRecordDecl>( 6440 StdBadAlloc.get(Context.getExternalSource())); 6441} 6442 6443NamespaceDecl *Sema::getStdNamespace() const { 6444 return cast_or_null<NamespaceDecl>( 6445 StdNamespace.get(Context.getExternalSource())); 6446} 6447 6448/// \brief Retrieve the special "std" namespace, which may require us to 6449/// implicitly define the namespace. 6450NamespaceDecl *Sema::getOrCreateStdNamespace() { 6451 if (!StdNamespace) { 6452 // The "std" namespace has not yet been defined, so build one implicitly. 6453 StdNamespace = NamespaceDecl::Create(Context, 6454 Context.getTranslationUnitDecl(), 6455 /*Inline=*/false, 6456 SourceLocation(), SourceLocation(), 6457 &PP.getIdentifierTable().get("std"), 6458 /*PrevDecl=*/0); 6459 getStdNamespace()->setImplicit(true); 6460 } 6461 6462 return getStdNamespace(); 6463} 6464 6465bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6466 assert(getLangOpts().CPlusPlus && 6467 "Looking for std::initializer_list outside of C++."); 6468 6469 // We're looking for implicit instantiations of 6470 // template <typename E> class std::initializer_list. 6471 6472 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6473 return false; 6474 6475 ClassTemplateDecl *Template = 0; 6476 const TemplateArgument *Arguments = 0; 6477 6478 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6479 6480 ClassTemplateSpecializationDecl *Specialization = 6481 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6482 if (!Specialization) 6483 return false; 6484 6485 Template = Specialization->getSpecializedTemplate(); 6486 Arguments = Specialization->getTemplateArgs().data(); 6487 } else if (const TemplateSpecializationType *TST = 6488 Ty->getAs<TemplateSpecializationType>()) { 6489 Template = dyn_cast_or_null<ClassTemplateDecl>( 6490 TST->getTemplateName().getAsTemplateDecl()); 6491 Arguments = TST->getArgs(); 6492 } 6493 if (!Template) 6494 return false; 6495 6496 if (!StdInitializerList) { 6497 // Haven't recognized std::initializer_list yet, maybe this is it. 6498 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6499 if (TemplateClass->getIdentifier() != 6500 &PP.getIdentifierTable().get("initializer_list") || 6501 !getStdNamespace()->InEnclosingNamespaceSetOf( 6502 TemplateClass->getDeclContext())) 6503 return false; 6504 // This is a template called std::initializer_list, but is it the right 6505 // template? 6506 TemplateParameterList *Params = Template->getTemplateParameters(); 6507 if (Params->getMinRequiredArguments() != 1) 6508 return false; 6509 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6510 return false; 6511 6512 // It's the right template. 6513 StdInitializerList = Template; 6514 } 6515 6516 if (Template != StdInitializerList) 6517 return false; 6518 6519 // This is an instance of std::initializer_list. Find the argument type. 6520 if (Element) 6521 *Element = Arguments[0].getAsType(); 6522 return true; 6523} 6524 6525static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6526 NamespaceDecl *Std = S.getStdNamespace(); 6527 if (!Std) { 6528 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6529 return 0; 6530 } 6531 6532 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6533 Loc, Sema::LookupOrdinaryName); 6534 if (!S.LookupQualifiedName(Result, Std)) { 6535 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6536 return 0; 6537 } 6538 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6539 if (!Template) { 6540 Result.suppressDiagnostics(); 6541 // We found something weird. Complain about the first thing we found. 6542 NamedDecl *Found = *Result.begin(); 6543 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6544 return 0; 6545 } 6546 6547 // We found some template called std::initializer_list. Now verify that it's 6548 // correct. 6549 TemplateParameterList *Params = Template->getTemplateParameters(); 6550 if (Params->getMinRequiredArguments() != 1 || 6551 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6552 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6553 return 0; 6554 } 6555 6556 return Template; 6557} 6558 6559QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6560 if (!StdInitializerList) { 6561 StdInitializerList = LookupStdInitializerList(*this, Loc); 6562 if (!StdInitializerList) 6563 return QualType(); 6564 } 6565 6566 TemplateArgumentListInfo Args(Loc, Loc); 6567 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6568 Context.getTrivialTypeSourceInfo(Element, 6569 Loc))); 6570 return Context.getCanonicalType( 6571 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6572} 6573 6574bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6575 // C++ [dcl.init.list]p2: 6576 // A constructor is an initializer-list constructor if its first parameter 6577 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6578 // std::initializer_list<E> for some type E, and either there are no other 6579 // parameters or else all other parameters have default arguments. 6580 if (Ctor->getNumParams() < 1 || 6581 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6582 return false; 6583 6584 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6585 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6586 ArgType = RT->getPointeeType().getUnqualifiedType(); 6587 6588 return isStdInitializerList(ArgType, 0); 6589} 6590 6591/// \brief Determine whether a using statement is in a context where it will be 6592/// apply in all contexts. 6593static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6594 switch (CurContext->getDeclKind()) { 6595 case Decl::TranslationUnit: 6596 return true; 6597 case Decl::LinkageSpec: 6598 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6599 default: 6600 return false; 6601 } 6602} 6603 6604namespace { 6605 6606// Callback to only accept typo corrections that are namespaces. 6607class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6608public: 6609 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 6610 if (NamedDecl *ND = candidate.getCorrectionDecl()) 6611 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6612 return false; 6613 } 6614}; 6615 6616} 6617 6618static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6619 CXXScopeSpec &SS, 6620 SourceLocation IdentLoc, 6621 IdentifierInfo *Ident) { 6622 NamespaceValidatorCCC Validator; 6623 R.clear(); 6624 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6625 R.getLookupKind(), Sc, &SS, 6626 Validator)) { 6627 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6628 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6629 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && 6630 Ident->getName().equals(CorrectedStr); 6631 S.diagnoseTypo(Corrected, 6632 S.PDiag(diag::err_using_directive_member_suggest) 6633 << Ident << DC << DroppedSpecifier << SS.getRange(), 6634 S.PDiag(diag::note_namespace_defined_here)); 6635 } else { 6636 S.diagnoseTypo(Corrected, 6637 S.PDiag(diag::err_using_directive_suggest) << Ident, 6638 S.PDiag(diag::note_namespace_defined_here)); 6639 } 6640 R.addDecl(Corrected.getCorrectionDecl()); 6641 return true; 6642 } 6643 return false; 6644} 6645 6646Decl *Sema::ActOnUsingDirective(Scope *S, 6647 SourceLocation UsingLoc, 6648 SourceLocation NamespcLoc, 6649 CXXScopeSpec &SS, 6650 SourceLocation IdentLoc, 6651 IdentifierInfo *NamespcName, 6652 AttributeList *AttrList) { 6653 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6654 assert(NamespcName && "Invalid NamespcName."); 6655 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6656 6657 // This can only happen along a recovery path. 6658 while (S->getFlags() & Scope::TemplateParamScope) 6659 S = S->getParent(); 6660 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6661 6662 UsingDirectiveDecl *UDir = 0; 6663 NestedNameSpecifier *Qualifier = 0; 6664 if (SS.isSet()) 6665 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6666 6667 // Lookup namespace name. 6668 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6669 LookupParsedName(R, S, &SS); 6670 if (R.isAmbiguous()) 6671 return 0; 6672 6673 if (R.empty()) { 6674 R.clear(); 6675 // Allow "using namespace std;" or "using namespace ::std;" even if 6676 // "std" hasn't been defined yet, for GCC compatibility. 6677 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6678 NamespcName->isStr("std")) { 6679 Diag(IdentLoc, diag::ext_using_undefined_std); 6680 R.addDecl(getOrCreateStdNamespace()); 6681 R.resolveKind(); 6682 } 6683 // Otherwise, attempt typo correction. 6684 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6685 } 6686 6687 if (!R.empty()) { 6688 NamedDecl *Named = R.getFoundDecl(); 6689 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6690 && "expected namespace decl"); 6691 // C++ [namespace.udir]p1: 6692 // A using-directive specifies that the names in the nominated 6693 // namespace can be used in the scope in which the 6694 // using-directive appears after the using-directive. During 6695 // unqualified name lookup (3.4.1), the names appear as if they 6696 // were declared in the nearest enclosing namespace which 6697 // contains both the using-directive and the nominated 6698 // namespace. [Note: in this context, "contains" means "contains 6699 // directly or indirectly". ] 6700 6701 // Find enclosing context containing both using-directive and 6702 // nominated namespace. 6703 NamespaceDecl *NS = getNamespaceDecl(Named); 6704 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6705 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6706 CommonAncestor = CommonAncestor->getParent(); 6707 6708 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6709 SS.getWithLocInContext(Context), 6710 IdentLoc, Named, CommonAncestor); 6711 6712 if (IsUsingDirectiveInToplevelContext(CurContext) && 6713 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6714 Diag(IdentLoc, diag::warn_using_directive_in_header); 6715 } 6716 6717 PushUsingDirective(S, UDir); 6718 } else { 6719 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6720 } 6721 6722 if (UDir) 6723 ProcessDeclAttributeList(S, UDir, AttrList); 6724 6725 return UDir; 6726} 6727 6728void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6729 // If the scope has an associated entity and the using directive is at 6730 // namespace or translation unit scope, add the UsingDirectiveDecl into 6731 // its lookup structure so qualified name lookup can find it. 6732 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6733 if (Ctx && !Ctx->isFunctionOrMethod()) 6734 Ctx->addDecl(UDir); 6735 else 6736 // Otherwise, it is at block sope. The using-directives will affect lookup 6737 // only to the end of the scope. 6738 S->PushUsingDirective(UDir); 6739} 6740 6741 6742Decl *Sema::ActOnUsingDeclaration(Scope *S, 6743 AccessSpecifier AS, 6744 bool HasUsingKeyword, 6745 SourceLocation UsingLoc, 6746 CXXScopeSpec &SS, 6747 UnqualifiedId &Name, 6748 AttributeList *AttrList, 6749 bool HasTypenameKeyword, 6750 SourceLocation TypenameLoc) { 6751 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6752 6753 switch (Name.getKind()) { 6754 case UnqualifiedId::IK_ImplicitSelfParam: 6755 case UnqualifiedId::IK_Identifier: 6756 case UnqualifiedId::IK_OperatorFunctionId: 6757 case UnqualifiedId::IK_LiteralOperatorId: 6758 case UnqualifiedId::IK_ConversionFunctionId: 6759 break; 6760 6761 case UnqualifiedId::IK_ConstructorName: 6762 case UnqualifiedId::IK_ConstructorTemplateId: 6763 // C++11 inheriting constructors. 6764 Diag(Name.getLocStart(), 6765 getLangOpts().CPlusPlus11 ? 6766 diag::warn_cxx98_compat_using_decl_constructor : 6767 diag::err_using_decl_constructor) 6768 << SS.getRange(); 6769 6770 if (getLangOpts().CPlusPlus11) break; 6771 6772 return 0; 6773 6774 case UnqualifiedId::IK_DestructorName: 6775 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6776 << SS.getRange(); 6777 return 0; 6778 6779 case UnqualifiedId::IK_TemplateId: 6780 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6781 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6782 return 0; 6783 } 6784 6785 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6786 DeclarationName TargetName = TargetNameInfo.getName(); 6787 if (!TargetName) 6788 return 0; 6789 6790 // Warn about access declarations. 6791 if (!HasUsingKeyword) { 6792 Diag(Name.getLocStart(), 6793 getLangOpts().CPlusPlus11 ? diag::err_access_decl 6794 : diag::warn_access_decl_deprecated) 6795 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6796 } 6797 6798 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6799 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6800 return 0; 6801 6802 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6803 TargetNameInfo, AttrList, 6804 /* IsInstantiation */ false, 6805 HasTypenameKeyword, TypenameLoc); 6806 if (UD) 6807 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6808 6809 return UD; 6810} 6811 6812/// \brief Determine whether a using declaration considers the given 6813/// declarations as "equivalent", e.g., if they are redeclarations of 6814/// the same entity or are both typedefs of the same type. 6815static bool 6816IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6817 bool &SuppressRedeclaration) { 6818 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6819 SuppressRedeclaration = false; 6820 return true; 6821 } 6822 6823 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6824 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6825 SuppressRedeclaration = true; 6826 return Context.hasSameType(TD1->getUnderlyingType(), 6827 TD2->getUnderlyingType()); 6828 } 6829 6830 return false; 6831} 6832 6833 6834/// Determines whether to create a using shadow decl for a particular 6835/// decl, given the set of decls existing prior to this using lookup. 6836bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6837 const LookupResult &Previous) { 6838 // Diagnose finding a decl which is not from a base class of the 6839 // current class. We do this now because there are cases where this 6840 // function will silently decide not to build a shadow decl, which 6841 // will pre-empt further diagnostics. 6842 // 6843 // We don't need to do this in C++0x because we do the check once on 6844 // the qualifier. 6845 // 6846 // FIXME: diagnose the following if we care enough: 6847 // struct A { int foo; }; 6848 // struct B : A { using A::foo; }; 6849 // template <class T> struct C : A {}; 6850 // template <class T> struct D : C<T> { using B::foo; } // <--- 6851 // This is invalid (during instantiation) in C++03 because B::foo 6852 // resolves to the using decl in B, which is not a base class of D<T>. 6853 // We can't diagnose it immediately because C<T> is an unknown 6854 // specialization. The UsingShadowDecl in D<T> then points directly 6855 // to A::foo, which will look well-formed when we instantiate. 6856 // The right solution is to not collapse the shadow-decl chain. 6857 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6858 DeclContext *OrigDC = Orig->getDeclContext(); 6859 6860 // Handle enums and anonymous structs. 6861 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6862 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6863 while (OrigRec->isAnonymousStructOrUnion()) 6864 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6865 6866 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6867 if (OrigDC == CurContext) { 6868 Diag(Using->getLocation(), 6869 diag::err_using_decl_nested_name_specifier_is_current_class) 6870 << Using->getQualifierLoc().getSourceRange(); 6871 Diag(Orig->getLocation(), diag::note_using_decl_target); 6872 return true; 6873 } 6874 6875 Diag(Using->getQualifierLoc().getBeginLoc(), 6876 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6877 << Using->getQualifier() 6878 << cast<CXXRecordDecl>(CurContext) 6879 << Using->getQualifierLoc().getSourceRange(); 6880 Diag(Orig->getLocation(), diag::note_using_decl_target); 6881 return true; 6882 } 6883 } 6884 6885 if (Previous.empty()) return false; 6886 6887 NamedDecl *Target = Orig; 6888 if (isa<UsingShadowDecl>(Target)) 6889 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6890 6891 // If the target happens to be one of the previous declarations, we 6892 // don't have a conflict. 6893 // 6894 // FIXME: but we might be increasing its access, in which case we 6895 // should redeclare it. 6896 NamedDecl *NonTag = 0, *Tag = 0; 6897 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6898 I != E; ++I) { 6899 NamedDecl *D = (*I)->getUnderlyingDecl(); 6900 bool Result; 6901 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6902 return Result; 6903 6904 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6905 } 6906 6907 if (Target->isFunctionOrFunctionTemplate()) { 6908 FunctionDecl *FD; 6909 if (isa<FunctionTemplateDecl>(Target)) 6910 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6911 else 6912 FD = cast<FunctionDecl>(Target); 6913 6914 NamedDecl *OldDecl = 0; 6915 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6916 case Ovl_Overload: 6917 return false; 6918 6919 case Ovl_NonFunction: 6920 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6921 break; 6922 6923 // We found a decl with the exact signature. 6924 case Ovl_Match: 6925 // If we're in a record, we want to hide the target, so we 6926 // return true (without a diagnostic) to tell the caller not to 6927 // build a shadow decl. 6928 if (CurContext->isRecord()) 6929 return true; 6930 6931 // If we're not in a record, this is an error. 6932 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6933 break; 6934 } 6935 6936 Diag(Target->getLocation(), diag::note_using_decl_target); 6937 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6938 return true; 6939 } 6940 6941 // Target is not a function. 6942 6943 if (isa<TagDecl>(Target)) { 6944 // No conflict between a tag and a non-tag. 6945 if (!Tag) return false; 6946 6947 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6948 Diag(Target->getLocation(), diag::note_using_decl_target); 6949 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6950 return true; 6951 } 6952 6953 // No conflict between a tag and a non-tag. 6954 if (!NonTag) return false; 6955 6956 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6957 Diag(Target->getLocation(), diag::note_using_decl_target); 6958 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6959 return true; 6960} 6961 6962/// Builds a shadow declaration corresponding to a 'using' declaration. 6963UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6964 UsingDecl *UD, 6965 NamedDecl *Orig) { 6966 6967 // If we resolved to another shadow declaration, just coalesce them. 6968 NamedDecl *Target = Orig; 6969 if (isa<UsingShadowDecl>(Target)) { 6970 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6971 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6972 } 6973 6974 UsingShadowDecl *Shadow 6975 = UsingShadowDecl::Create(Context, CurContext, 6976 UD->getLocation(), UD, Target); 6977 UD->addShadowDecl(Shadow); 6978 6979 Shadow->setAccess(UD->getAccess()); 6980 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6981 Shadow->setInvalidDecl(); 6982 6983 if (S) 6984 PushOnScopeChains(Shadow, S); 6985 else 6986 CurContext->addDecl(Shadow); 6987 6988 6989 return Shadow; 6990} 6991 6992/// Hides a using shadow declaration. This is required by the current 6993/// using-decl implementation when a resolvable using declaration in a 6994/// class is followed by a declaration which would hide or override 6995/// one or more of the using decl's targets; for example: 6996/// 6997/// struct Base { void foo(int); }; 6998/// struct Derived : Base { 6999/// using Base::foo; 7000/// void foo(int); 7001/// }; 7002/// 7003/// The governing language is C++03 [namespace.udecl]p12: 7004/// 7005/// When a using-declaration brings names from a base class into a 7006/// derived class scope, member functions in the derived class 7007/// override and/or hide member functions with the same name and 7008/// parameter types in a base class (rather than conflicting). 7009/// 7010/// There are two ways to implement this: 7011/// (1) optimistically create shadow decls when they're not hidden 7012/// by existing declarations, or 7013/// (2) don't create any shadow decls (or at least don't make them 7014/// visible) until we've fully parsed/instantiated the class. 7015/// The problem with (1) is that we might have to retroactively remove 7016/// a shadow decl, which requires several O(n) operations because the 7017/// decl structures are (very reasonably) not designed for removal. 7018/// (2) avoids this but is very fiddly and phase-dependent. 7019void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7020 if (Shadow->getDeclName().getNameKind() == 7021 DeclarationName::CXXConversionFunctionName) 7022 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7023 7024 // Remove it from the DeclContext... 7025 Shadow->getDeclContext()->removeDecl(Shadow); 7026 7027 // ...and the scope, if applicable... 7028 if (S) { 7029 S->RemoveDecl(Shadow); 7030 IdResolver.RemoveDecl(Shadow); 7031 } 7032 7033 // ...and the using decl. 7034 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7035 7036 // TODO: complain somehow if Shadow was used. It shouldn't 7037 // be possible for this to happen, because...? 7038} 7039 7040namespace { 7041class UsingValidatorCCC : public CorrectionCandidateCallback { 7042public: 7043 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation) 7044 : HasTypenameKeyword(HasTypenameKeyword), 7045 IsInstantiation(IsInstantiation) {} 7046 7047 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE { 7048 NamedDecl *ND = Candidate.getCorrectionDecl(); 7049 7050 // Keywords are not valid here. 7051 if (!ND || isa<NamespaceDecl>(ND)) 7052 return false; 7053 7054 // Completely unqualified names are invalid for a 'using' declaration. 7055 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) 7056 return false; 7057 7058 if (isa<TypeDecl>(ND)) 7059 return HasTypenameKeyword || !IsInstantiation; 7060 7061 return !HasTypenameKeyword; 7062 } 7063 7064private: 7065 bool HasTypenameKeyword; 7066 bool IsInstantiation; 7067}; 7068} // end anonymous namespace 7069 7070/// Builds a using declaration. 7071/// 7072/// \param IsInstantiation - Whether this call arises from an 7073/// instantiation of an unresolved using declaration. We treat 7074/// the lookup differently for these declarations. 7075NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7076 SourceLocation UsingLoc, 7077 CXXScopeSpec &SS, 7078 const DeclarationNameInfo &NameInfo, 7079 AttributeList *AttrList, 7080 bool IsInstantiation, 7081 bool HasTypenameKeyword, 7082 SourceLocation TypenameLoc) { 7083 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7084 SourceLocation IdentLoc = NameInfo.getLoc(); 7085 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7086 7087 // FIXME: We ignore attributes for now. 7088 7089 if (SS.isEmpty()) { 7090 Diag(IdentLoc, diag::err_using_requires_qualname); 7091 return 0; 7092 } 7093 7094 // Do the redeclaration lookup in the current scope. 7095 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7096 ForRedeclaration); 7097 Previous.setHideTags(false); 7098 if (S) { 7099 LookupName(Previous, S); 7100 7101 // It is really dumb that we have to do this. 7102 LookupResult::Filter F = Previous.makeFilter(); 7103 while (F.hasNext()) { 7104 NamedDecl *D = F.next(); 7105 if (!isDeclInScope(D, CurContext, S)) 7106 F.erase(); 7107 } 7108 F.done(); 7109 } else { 7110 assert(IsInstantiation && "no scope in non-instantiation"); 7111 assert(CurContext->isRecord() && "scope not record in instantiation"); 7112 LookupQualifiedName(Previous, CurContext); 7113 } 7114 7115 // Check for invalid redeclarations. 7116 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, 7117 SS, IdentLoc, Previous)) 7118 return 0; 7119 7120 // Check for bad qualifiers. 7121 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7122 return 0; 7123 7124 DeclContext *LookupContext = computeDeclContext(SS); 7125 NamedDecl *D; 7126 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7127 if (!LookupContext) { 7128 if (HasTypenameKeyword) { 7129 // FIXME: not all declaration name kinds are legal here 7130 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7131 UsingLoc, TypenameLoc, 7132 QualifierLoc, 7133 IdentLoc, NameInfo.getName()); 7134 } else { 7135 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7136 QualifierLoc, NameInfo); 7137 } 7138 } else { 7139 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7140 NameInfo, HasTypenameKeyword); 7141 } 7142 D->setAccess(AS); 7143 CurContext->addDecl(D); 7144 7145 if (!LookupContext) return D; 7146 UsingDecl *UD = cast<UsingDecl>(D); 7147 7148 if (RequireCompleteDeclContext(SS, LookupContext)) { 7149 UD->setInvalidDecl(); 7150 return UD; 7151 } 7152 7153 // The normal rules do not apply to inheriting constructor declarations. 7154 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7155 if (CheckInheritingConstructorUsingDecl(UD)) 7156 UD->setInvalidDecl(); 7157 return UD; 7158 } 7159 7160 // Otherwise, look up the target name. 7161 7162 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7163 7164 // Unlike most lookups, we don't always want to hide tag 7165 // declarations: tag names are visible through the using declaration 7166 // even if hidden by ordinary names, *except* in a dependent context 7167 // where it's important for the sanity of two-phase lookup. 7168 if (!IsInstantiation) 7169 R.setHideTags(false); 7170 7171 // For the purposes of this lookup, we have a base object type 7172 // equal to that of the current context. 7173 if (CurContext->isRecord()) { 7174 R.setBaseObjectType( 7175 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7176 } 7177 7178 LookupQualifiedName(R, LookupContext); 7179 7180 // Try to correct typos if possible. 7181 if (R.empty()) { 7182 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation); 7183 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7184 R.getLookupKind(), S, &SS, CCC)){ 7185 // We reject any correction for which ND would be NULL. 7186 NamedDecl *ND = Corrected.getCorrectionDecl(); 7187 R.setLookupName(Corrected.getCorrection()); 7188 R.addDecl(ND); 7189 // We reject candidates where DroppedSpecifier == true, hence the 7190 // literal '0' below. 7191 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) 7192 << NameInfo.getName() << LookupContext << 0 7193 << SS.getRange()); 7194 } else { 7195 Diag(IdentLoc, diag::err_no_member) 7196 << NameInfo.getName() << LookupContext << SS.getRange(); 7197 UD->setInvalidDecl(); 7198 return UD; 7199 } 7200 } 7201 7202 if (R.isAmbiguous()) { 7203 UD->setInvalidDecl(); 7204 return UD; 7205 } 7206 7207 if (HasTypenameKeyword) { 7208 // If we asked for a typename and got a non-type decl, error out. 7209 if (!R.getAsSingle<TypeDecl>()) { 7210 Diag(IdentLoc, diag::err_using_typename_non_type); 7211 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7212 Diag((*I)->getUnderlyingDecl()->getLocation(), 7213 diag::note_using_decl_target); 7214 UD->setInvalidDecl(); 7215 return UD; 7216 } 7217 } else { 7218 // If we asked for a non-typename and we got a type, error out, 7219 // but only if this is an instantiation of an unresolved using 7220 // decl. Otherwise just silently find the type name. 7221 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7222 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7223 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7224 UD->setInvalidDecl(); 7225 return UD; 7226 } 7227 } 7228 7229 // C++0x N2914 [namespace.udecl]p6: 7230 // A using-declaration shall not name a namespace. 7231 if (R.getAsSingle<NamespaceDecl>()) { 7232 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7233 << SS.getRange(); 7234 UD->setInvalidDecl(); 7235 return UD; 7236 } 7237 7238 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7239 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7240 BuildUsingShadowDecl(S, UD, *I); 7241 } 7242 7243 return UD; 7244} 7245 7246/// Additional checks for a using declaration referring to a constructor name. 7247bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7248 assert(!UD->hasTypename() && "expecting a constructor name"); 7249 7250 const Type *SourceType = UD->getQualifier()->getAsType(); 7251 assert(SourceType && 7252 "Using decl naming constructor doesn't have type in scope spec."); 7253 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7254 7255 // Check whether the named type is a direct base class. 7256 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7257 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7258 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7259 BaseIt != BaseE; ++BaseIt) { 7260 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7261 if (CanonicalSourceType == BaseType) 7262 break; 7263 if (BaseIt->getType()->isDependentType()) 7264 break; 7265 } 7266 7267 if (BaseIt == BaseE) { 7268 // Did not find SourceType in the bases. 7269 Diag(UD->getUsingLoc(), 7270 diag::err_using_decl_constructor_not_in_direct_base) 7271 << UD->getNameInfo().getSourceRange() 7272 << QualType(SourceType, 0) << TargetClass; 7273 return true; 7274 } 7275 7276 if (!CurContext->isDependentContext()) 7277 BaseIt->setInheritConstructors(); 7278 7279 return false; 7280} 7281 7282/// Checks that the given using declaration is not an invalid 7283/// redeclaration. Note that this is checking only for the using decl 7284/// itself, not for any ill-formedness among the UsingShadowDecls. 7285bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7286 bool HasTypenameKeyword, 7287 const CXXScopeSpec &SS, 7288 SourceLocation NameLoc, 7289 const LookupResult &Prev) { 7290 // C++03 [namespace.udecl]p8: 7291 // C++0x [namespace.udecl]p10: 7292 // A using-declaration is a declaration and can therefore be used 7293 // repeatedly where (and only where) multiple declarations are 7294 // allowed. 7295 // 7296 // That's in non-member contexts. 7297 if (!CurContext->getRedeclContext()->isRecord()) 7298 return false; 7299 7300 NestedNameSpecifier *Qual 7301 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7302 7303 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7304 NamedDecl *D = *I; 7305 7306 bool DTypename; 7307 NestedNameSpecifier *DQual; 7308 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7309 DTypename = UD->hasTypename(); 7310 DQual = UD->getQualifier(); 7311 } else if (UnresolvedUsingValueDecl *UD 7312 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7313 DTypename = false; 7314 DQual = UD->getQualifier(); 7315 } else if (UnresolvedUsingTypenameDecl *UD 7316 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7317 DTypename = true; 7318 DQual = UD->getQualifier(); 7319 } else continue; 7320 7321 // using decls differ if one says 'typename' and the other doesn't. 7322 // FIXME: non-dependent using decls? 7323 if (HasTypenameKeyword != DTypename) continue; 7324 7325 // using decls differ if they name different scopes (but note that 7326 // template instantiation can cause this check to trigger when it 7327 // didn't before instantiation). 7328 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7329 Context.getCanonicalNestedNameSpecifier(DQual)) 7330 continue; 7331 7332 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7333 Diag(D->getLocation(), diag::note_using_decl) << 1; 7334 return true; 7335 } 7336 7337 return false; 7338} 7339 7340 7341/// Checks that the given nested-name qualifier used in a using decl 7342/// in the current context is appropriately related to the current 7343/// scope. If an error is found, diagnoses it and returns true. 7344bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7345 const CXXScopeSpec &SS, 7346 SourceLocation NameLoc) { 7347 DeclContext *NamedContext = computeDeclContext(SS); 7348 7349 if (!CurContext->isRecord()) { 7350 // C++03 [namespace.udecl]p3: 7351 // C++0x [namespace.udecl]p8: 7352 // A using-declaration for a class member shall be a member-declaration. 7353 7354 // If we weren't able to compute a valid scope, it must be a 7355 // dependent class scope. 7356 if (!NamedContext || NamedContext->isRecord()) { 7357 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7358 << SS.getRange(); 7359 return true; 7360 } 7361 7362 // Otherwise, everything is known to be fine. 7363 return false; 7364 } 7365 7366 // The current scope is a record. 7367 7368 // If the named context is dependent, we can't decide much. 7369 if (!NamedContext) { 7370 // FIXME: in C++0x, we can diagnose if we can prove that the 7371 // nested-name-specifier does not refer to a base class, which is 7372 // still possible in some cases. 7373 7374 // Otherwise we have to conservatively report that things might be 7375 // okay. 7376 return false; 7377 } 7378 7379 if (!NamedContext->isRecord()) { 7380 // Ideally this would point at the last name in the specifier, 7381 // but we don't have that level of source info. 7382 Diag(SS.getRange().getBegin(), 7383 diag::err_using_decl_nested_name_specifier_is_not_class) 7384 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7385 return true; 7386 } 7387 7388 if (!NamedContext->isDependentContext() && 7389 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7390 return true; 7391 7392 if (getLangOpts().CPlusPlus11) { 7393 // C++0x [namespace.udecl]p3: 7394 // In a using-declaration used as a member-declaration, the 7395 // nested-name-specifier shall name a base class of the class 7396 // being defined. 7397 7398 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7399 cast<CXXRecordDecl>(NamedContext))) { 7400 if (CurContext == NamedContext) { 7401 Diag(NameLoc, 7402 diag::err_using_decl_nested_name_specifier_is_current_class) 7403 << SS.getRange(); 7404 return true; 7405 } 7406 7407 Diag(SS.getRange().getBegin(), 7408 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7409 << (NestedNameSpecifier*) SS.getScopeRep() 7410 << cast<CXXRecordDecl>(CurContext) 7411 << SS.getRange(); 7412 return true; 7413 } 7414 7415 return false; 7416 } 7417 7418 // C++03 [namespace.udecl]p4: 7419 // A using-declaration used as a member-declaration shall refer 7420 // to a member of a base class of the class being defined [etc.]. 7421 7422 // Salient point: SS doesn't have to name a base class as long as 7423 // lookup only finds members from base classes. Therefore we can 7424 // diagnose here only if we can prove that that can't happen, 7425 // i.e. if the class hierarchies provably don't intersect. 7426 7427 // TODO: it would be nice if "definitely valid" results were cached 7428 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7429 // need to be repeated. 7430 7431 struct UserData { 7432 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7433 7434 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7435 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7436 Data->Bases.insert(Base); 7437 return true; 7438 } 7439 7440 bool hasDependentBases(const CXXRecordDecl *Class) { 7441 return !Class->forallBases(collect, this); 7442 } 7443 7444 /// Returns true if the base is dependent or is one of the 7445 /// accumulated base classes. 7446 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7447 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7448 return !Data->Bases.count(Base); 7449 } 7450 7451 bool mightShareBases(const CXXRecordDecl *Class) { 7452 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7453 } 7454 }; 7455 7456 UserData Data; 7457 7458 // Returns false if we find a dependent base. 7459 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7460 return false; 7461 7462 // Returns false if the class has a dependent base or if it or one 7463 // of its bases is present in the base set of the current context. 7464 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7465 return false; 7466 7467 Diag(SS.getRange().getBegin(), 7468 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7469 << (NestedNameSpecifier*) SS.getScopeRep() 7470 << cast<CXXRecordDecl>(CurContext) 7471 << SS.getRange(); 7472 7473 return true; 7474} 7475 7476Decl *Sema::ActOnAliasDeclaration(Scope *S, 7477 AccessSpecifier AS, 7478 MultiTemplateParamsArg TemplateParamLists, 7479 SourceLocation UsingLoc, 7480 UnqualifiedId &Name, 7481 AttributeList *AttrList, 7482 TypeResult Type) { 7483 // Skip up to the relevant declaration scope. 7484 while (S->getFlags() & Scope::TemplateParamScope) 7485 S = S->getParent(); 7486 assert((S->getFlags() & Scope::DeclScope) && 7487 "got alias-declaration outside of declaration scope"); 7488 7489 if (Type.isInvalid()) 7490 return 0; 7491 7492 bool Invalid = false; 7493 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7494 TypeSourceInfo *TInfo = 0; 7495 GetTypeFromParser(Type.get(), &TInfo); 7496 7497 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7498 return 0; 7499 7500 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7501 UPPC_DeclarationType)) { 7502 Invalid = true; 7503 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7504 TInfo->getTypeLoc().getBeginLoc()); 7505 } 7506 7507 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7508 LookupName(Previous, S); 7509 7510 // Warn about shadowing the name of a template parameter. 7511 if (Previous.isSingleResult() && 7512 Previous.getFoundDecl()->isTemplateParameter()) { 7513 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7514 Previous.clear(); 7515 } 7516 7517 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7518 "name in alias declaration must be an identifier"); 7519 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7520 Name.StartLocation, 7521 Name.Identifier, TInfo); 7522 7523 NewTD->setAccess(AS); 7524 7525 if (Invalid) 7526 NewTD->setInvalidDecl(); 7527 7528 ProcessDeclAttributeList(S, NewTD, AttrList); 7529 7530 CheckTypedefForVariablyModifiedType(S, NewTD); 7531 Invalid |= NewTD->isInvalidDecl(); 7532 7533 bool Redeclaration = false; 7534 7535 NamedDecl *NewND; 7536 if (TemplateParamLists.size()) { 7537 TypeAliasTemplateDecl *OldDecl = 0; 7538 TemplateParameterList *OldTemplateParams = 0; 7539 7540 if (TemplateParamLists.size() != 1) { 7541 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7542 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7543 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7544 } 7545 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7546 7547 // Only consider previous declarations in the same scope. 7548 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7549 /*ExplicitInstantiationOrSpecialization*/false); 7550 if (!Previous.empty()) { 7551 Redeclaration = true; 7552 7553 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7554 if (!OldDecl && !Invalid) { 7555 Diag(UsingLoc, diag::err_redefinition_different_kind) 7556 << Name.Identifier; 7557 7558 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7559 if (OldD->getLocation().isValid()) 7560 Diag(OldD->getLocation(), diag::note_previous_definition); 7561 7562 Invalid = true; 7563 } 7564 7565 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7566 if (TemplateParameterListsAreEqual(TemplateParams, 7567 OldDecl->getTemplateParameters(), 7568 /*Complain=*/true, 7569 TPL_TemplateMatch)) 7570 OldTemplateParams = OldDecl->getTemplateParameters(); 7571 else 7572 Invalid = true; 7573 7574 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7575 if (!Invalid && 7576 !Context.hasSameType(OldTD->getUnderlyingType(), 7577 NewTD->getUnderlyingType())) { 7578 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7579 // but we can't reasonably accept it. 7580 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7581 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7582 if (OldTD->getLocation().isValid()) 7583 Diag(OldTD->getLocation(), diag::note_previous_definition); 7584 Invalid = true; 7585 } 7586 } 7587 } 7588 7589 // Merge any previous default template arguments into our parameters, 7590 // and check the parameter list. 7591 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7592 TPC_TypeAliasTemplate)) 7593 return 0; 7594 7595 TypeAliasTemplateDecl *NewDecl = 7596 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7597 Name.Identifier, TemplateParams, 7598 NewTD); 7599 7600 NewDecl->setAccess(AS); 7601 7602 if (Invalid) 7603 NewDecl->setInvalidDecl(); 7604 else if (OldDecl) 7605 NewDecl->setPreviousDeclaration(OldDecl); 7606 7607 NewND = NewDecl; 7608 } else { 7609 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7610 NewND = NewTD; 7611 } 7612 7613 if (!Redeclaration) 7614 PushOnScopeChains(NewND, S); 7615 7616 ActOnDocumentableDecl(NewND); 7617 return NewND; 7618} 7619 7620Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7621 SourceLocation NamespaceLoc, 7622 SourceLocation AliasLoc, 7623 IdentifierInfo *Alias, 7624 CXXScopeSpec &SS, 7625 SourceLocation IdentLoc, 7626 IdentifierInfo *Ident) { 7627 7628 // Lookup the namespace name. 7629 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7630 LookupParsedName(R, S, &SS); 7631 7632 // Check if we have a previous declaration with the same name. 7633 NamedDecl *PrevDecl 7634 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7635 ForRedeclaration); 7636 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7637 PrevDecl = 0; 7638 7639 if (PrevDecl) { 7640 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7641 // We already have an alias with the same name that points to the same 7642 // namespace, so don't create a new one. 7643 // FIXME: At some point, we'll want to create the (redundant) 7644 // declaration to maintain better source information. 7645 if (!R.isAmbiguous() && !R.empty() && 7646 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7647 return 0; 7648 } 7649 7650 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7651 diag::err_redefinition_different_kind; 7652 Diag(AliasLoc, DiagID) << Alias; 7653 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7654 return 0; 7655 } 7656 7657 if (R.isAmbiguous()) 7658 return 0; 7659 7660 if (R.empty()) { 7661 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7662 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7663 return 0; 7664 } 7665 } 7666 7667 NamespaceAliasDecl *AliasDecl = 7668 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7669 Alias, SS.getWithLocInContext(Context), 7670 IdentLoc, R.getFoundDecl()); 7671 7672 PushOnScopeChains(AliasDecl, S); 7673 return AliasDecl; 7674} 7675 7676Sema::ImplicitExceptionSpecification 7677Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7678 CXXMethodDecl *MD) { 7679 CXXRecordDecl *ClassDecl = MD->getParent(); 7680 7681 // C++ [except.spec]p14: 7682 // An implicitly declared special member function (Clause 12) shall have an 7683 // exception-specification. [...] 7684 ImplicitExceptionSpecification ExceptSpec(*this); 7685 if (ClassDecl->isInvalidDecl()) 7686 return ExceptSpec; 7687 7688 // Direct base-class constructors. 7689 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7690 BEnd = ClassDecl->bases_end(); 7691 B != BEnd; ++B) { 7692 if (B->isVirtual()) // Handled below. 7693 continue; 7694 7695 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7696 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7697 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7698 // If this is a deleted function, add it anyway. This might be conformant 7699 // with the standard. This might not. I'm not sure. It might not matter. 7700 if (Constructor) 7701 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7702 } 7703 } 7704 7705 // Virtual base-class constructors. 7706 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7707 BEnd = ClassDecl->vbases_end(); 7708 B != BEnd; ++B) { 7709 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7710 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7711 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7712 // If this is a deleted function, add it anyway. This might be conformant 7713 // with the standard. This might not. I'm not sure. It might not matter. 7714 if (Constructor) 7715 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7716 } 7717 } 7718 7719 // Field constructors. 7720 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7721 FEnd = ClassDecl->field_end(); 7722 F != FEnd; ++F) { 7723 if (F->hasInClassInitializer()) { 7724 if (Expr *E = F->getInClassInitializer()) 7725 ExceptSpec.CalledExpr(E); 7726 else if (!F->isInvalidDecl()) 7727 // DR1351: 7728 // If the brace-or-equal-initializer of a non-static data member 7729 // invokes a defaulted default constructor of its class or of an 7730 // enclosing class in a potentially evaluated subexpression, the 7731 // program is ill-formed. 7732 // 7733 // This resolution is unworkable: the exception specification of the 7734 // default constructor can be needed in an unevaluated context, in 7735 // particular, in the operand of a noexcept-expression, and we can be 7736 // unable to compute an exception specification for an enclosed class. 7737 // 7738 // We do not allow an in-class initializer to require the evaluation 7739 // of the exception specification for any in-class initializer whose 7740 // definition is not lexically complete. 7741 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7742 } else if (const RecordType *RecordTy 7743 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7744 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7745 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7746 // If this is a deleted function, add it anyway. This might be conformant 7747 // with the standard. This might not. I'm not sure. It might not matter. 7748 // In particular, the problem is that this function never gets called. It 7749 // might just be ill-formed because this function attempts to refer to 7750 // a deleted function here. 7751 if (Constructor) 7752 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7753 } 7754 } 7755 7756 return ExceptSpec; 7757} 7758 7759Sema::ImplicitExceptionSpecification 7760Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7761 CXXRecordDecl *ClassDecl = CD->getParent(); 7762 7763 // C++ [except.spec]p14: 7764 // An inheriting constructor [...] shall have an exception-specification. [...] 7765 ImplicitExceptionSpecification ExceptSpec(*this); 7766 if (ClassDecl->isInvalidDecl()) 7767 return ExceptSpec; 7768 7769 // Inherited constructor. 7770 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7771 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7772 // FIXME: Copying or moving the parameters could add extra exceptions to the 7773 // set, as could the default arguments for the inherited constructor. This 7774 // will be addressed when we implement the resolution of core issue 1351. 7775 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7776 7777 // Direct base-class constructors. 7778 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7779 BEnd = ClassDecl->bases_end(); 7780 B != BEnd; ++B) { 7781 if (B->isVirtual()) // Handled below. 7782 continue; 7783 7784 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7785 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7786 if (BaseClassDecl == InheritedDecl) 7787 continue; 7788 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7789 if (Constructor) 7790 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7791 } 7792 } 7793 7794 // Virtual base-class constructors. 7795 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7796 BEnd = ClassDecl->vbases_end(); 7797 B != BEnd; ++B) { 7798 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7799 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7800 if (BaseClassDecl == InheritedDecl) 7801 continue; 7802 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7803 if (Constructor) 7804 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7805 } 7806 } 7807 7808 // Field constructors. 7809 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7810 FEnd = ClassDecl->field_end(); 7811 F != FEnd; ++F) { 7812 if (F->hasInClassInitializer()) { 7813 if (Expr *E = F->getInClassInitializer()) 7814 ExceptSpec.CalledExpr(E); 7815 else if (!F->isInvalidDecl()) 7816 Diag(CD->getLocation(), 7817 diag::err_in_class_initializer_references_def_ctor) << CD; 7818 } else if (const RecordType *RecordTy 7819 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7820 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7821 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7822 if (Constructor) 7823 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7824 } 7825 } 7826 7827 return ExceptSpec; 7828} 7829 7830namespace { 7831/// RAII object to register a special member as being currently declared. 7832struct DeclaringSpecialMember { 7833 Sema &S; 7834 Sema::SpecialMemberDecl D; 7835 bool WasAlreadyBeingDeclared; 7836 7837 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7838 : S(S), D(RD, CSM) { 7839 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7840 if (WasAlreadyBeingDeclared) 7841 // This almost never happens, but if it does, ensure that our cache 7842 // doesn't contain a stale result. 7843 S.SpecialMemberCache.clear(); 7844 7845 // FIXME: Register a note to be produced if we encounter an error while 7846 // declaring the special member. 7847 } 7848 ~DeclaringSpecialMember() { 7849 if (!WasAlreadyBeingDeclared) 7850 S.SpecialMembersBeingDeclared.erase(D); 7851 } 7852 7853 /// \brief Are we already trying to declare this special member? 7854 bool isAlreadyBeingDeclared() const { 7855 return WasAlreadyBeingDeclared; 7856 } 7857}; 7858} 7859 7860CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7861 CXXRecordDecl *ClassDecl) { 7862 // C++ [class.ctor]p5: 7863 // A default constructor for a class X is a constructor of class X 7864 // that can be called without an argument. If there is no 7865 // user-declared constructor for class X, a default constructor is 7866 // implicitly declared. An implicitly-declared default constructor 7867 // is an inline public member of its class. 7868 assert(ClassDecl->needsImplicitDefaultConstructor() && 7869 "Should not build implicit default constructor!"); 7870 7871 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7872 if (DSM.isAlreadyBeingDeclared()) 7873 return 0; 7874 7875 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7876 CXXDefaultConstructor, 7877 false); 7878 7879 // Create the actual constructor declaration. 7880 CanQualType ClassType 7881 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7882 SourceLocation ClassLoc = ClassDecl->getLocation(); 7883 DeclarationName Name 7884 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7885 DeclarationNameInfo NameInfo(Name, ClassLoc); 7886 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7887 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7888 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7889 Constexpr); 7890 DefaultCon->setAccess(AS_public); 7891 DefaultCon->setDefaulted(); 7892 DefaultCon->setImplicit(); 7893 7894 // Build an exception specification pointing back at this constructor. 7895 FunctionProtoType::ExtProtoInfo EPI; 7896 EPI.ExceptionSpecType = EST_Unevaluated; 7897 EPI.ExceptionSpecDecl = DefaultCon; 7898 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 7899 7900 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7901 // constructors is easy to compute. 7902 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7903 7904 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7905 SetDeclDeleted(DefaultCon, ClassLoc); 7906 7907 // Note that we have declared this constructor. 7908 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7909 7910 if (Scope *S = getScopeForContext(ClassDecl)) 7911 PushOnScopeChains(DefaultCon, S, false); 7912 ClassDecl->addDecl(DefaultCon); 7913 7914 return DefaultCon; 7915} 7916 7917void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7918 CXXConstructorDecl *Constructor) { 7919 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7920 !Constructor->doesThisDeclarationHaveABody() && 7921 !Constructor->isDeleted()) && 7922 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7923 7924 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7925 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7926 7927 SynthesizedFunctionScope Scope(*this, Constructor); 7928 DiagnosticErrorTrap Trap(Diags); 7929 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7930 Trap.hasErrorOccurred()) { 7931 Diag(CurrentLocation, diag::note_member_synthesized_at) 7932 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7933 Constructor->setInvalidDecl(); 7934 return; 7935 } 7936 7937 SourceLocation Loc = Constructor->getLocation(); 7938 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7939 7940 Constructor->setUsed(); 7941 MarkVTableUsed(CurrentLocation, ClassDecl); 7942 7943 if (ASTMutationListener *L = getASTMutationListener()) { 7944 L->CompletedImplicitDefinition(Constructor); 7945 } 7946} 7947 7948void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7949 // Check that any explicitly-defaulted methods have exception specifications 7950 // compatible with their implicit exception specifications. 7951 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7952} 7953 7954namespace { 7955/// Information on inheriting constructors to declare. 7956class InheritingConstructorInfo { 7957public: 7958 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7959 : SemaRef(SemaRef), Derived(Derived) { 7960 // Mark the constructors that we already have in the derived class. 7961 // 7962 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7963 // unless there is a user-declared constructor with the same signature in 7964 // the class where the using-declaration appears. 7965 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7966 } 7967 7968 void inheritAll(CXXRecordDecl *RD) { 7969 visitAll(RD, &InheritingConstructorInfo::inherit); 7970 } 7971 7972private: 7973 /// Information about an inheriting constructor. 7974 struct InheritingConstructor { 7975 InheritingConstructor() 7976 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7977 7978 /// If \c true, a constructor with this signature is already declared 7979 /// in the derived class. 7980 bool DeclaredInDerived; 7981 7982 /// The constructor which is inherited. 7983 const CXXConstructorDecl *BaseCtor; 7984 7985 /// The derived constructor we declared. 7986 CXXConstructorDecl *DerivedCtor; 7987 }; 7988 7989 /// Inheriting constructors with a given canonical type. There can be at 7990 /// most one such non-template constructor, and any number of templated 7991 /// constructors. 7992 struct InheritingConstructorsForType { 7993 InheritingConstructor NonTemplate; 7994 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4> 7995 Templates; 7996 7997 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7998 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7999 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 8000 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 8001 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 8002 false, S.TPL_TemplateMatch)) 8003 return Templates[I].second; 8004 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 8005 return Templates.back().second; 8006 } 8007 8008 return NonTemplate; 8009 } 8010 }; 8011 8012 /// Get or create the inheriting constructor record for a constructor. 8013 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8014 QualType CtorType) { 8015 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8016 .getEntry(SemaRef, Ctor); 8017 } 8018 8019 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8020 8021 /// Process all constructors for a class. 8022 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8023 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8024 CtorE = RD->ctor_end(); 8025 CtorIt != CtorE; ++CtorIt) 8026 (this->*Callback)(*CtorIt); 8027 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8028 I(RD->decls_begin()), E(RD->decls_end()); 8029 I != E; ++I) { 8030 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8031 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8032 (this->*Callback)(CD); 8033 } 8034 } 8035 8036 /// Note that a constructor (or constructor template) was declared in Derived. 8037 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8038 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8039 } 8040 8041 /// Inherit a single constructor. 8042 void inherit(const CXXConstructorDecl *Ctor) { 8043 const FunctionProtoType *CtorType = 8044 Ctor->getType()->castAs<FunctionProtoType>(); 8045 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8046 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8047 8048 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8049 8050 // Core issue (no number yet): the ellipsis is always discarded. 8051 if (EPI.Variadic) { 8052 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8053 SemaRef.Diag(Ctor->getLocation(), 8054 diag::note_using_decl_constructor_ellipsis); 8055 EPI.Variadic = false; 8056 } 8057 8058 // Declare a constructor for each number of parameters. 8059 // 8060 // C++11 [class.inhctor]p1: 8061 // The candidate set of inherited constructors from the class X named in 8062 // the using-declaration consists of [... modulo defects ...] for each 8063 // constructor or constructor template of X, the set of constructors or 8064 // constructor templates that results from omitting any ellipsis parameter 8065 // specification and successively omitting parameters with a default 8066 // argument from the end of the parameter-type-list 8067 unsigned MinParams = minParamsToInherit(Ctor); 8068 unsigned Params = Ctor->getNumParams(); 8069 if (Params >= MinParams) { 8070 do 8071 declareCtor(UsingLoc, Ctor, 8072 SemaRef.Context.getFunctionType( 8073 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8074 while (Params > MinParams && 8075 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8076 } 8077 } 8078 8079 /// Find the using-declaration which specified that we should inherit the 8080 /// constructors of \p Base. 8081 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8082 // No fancy lookup required; just look for the base constructor name 8083 // directly within the derived class. 8084 ASTContext &Context = SemaRef.Context; 8085 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8086 Context.getCanonicalType(Context.getRecordType(Base))); 8087 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8088 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8089 } 8090 8091 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8092 // C++11 [class.inhctor]p3: 8093 // [F]or each constructor template in the candidate set of inherited 8094 // constructors, a constructor template is implicitly declared 8095 if (Ctor->getDescribedFunctionTemplate()) 8096 return 0; 8097 8098 // For each non-template constructor in the candidate set of inherited 8099 // constructors other than a constructor having no parameters or a 8100 // copy/move constructor having a single parameter, a constructor is 8101 // implicitly declared [...] 8102 if (Ctor->getNumParams() == 0) 8103 return 1; 8104 if (Ctor->isCopyOrMoveConstructor()) 8105 return 2; 8106 8107 // Per discussion on core reflector, never inherit a constructor which 8108 // would become a default, copy, or move constructor of Derived either. 8109 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8110 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8111 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8112 } 8113 8114 /// Declare a single inheriting constructor, inheriting the specified 8115 /// constructor, with the given type. 8116 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8117 QualType DerivedType) { 8118 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8119 8120 // C++11 [class.inhctor]p3: 8121 // ... a constructor is implicitly declared with the same constructor 8122 // characteristics unless there is a user-declared constructor with 8123 // the same signature in the class where the using-declaration appears 8124 if (Entry.DeclaredInDerived) 8125 return; 8126 8127 // C++11 [class.inhctor]p7: 8128 // If two using-declarations declare inheriting constructors with the 8129 // same signature, the program is ill-formed 8130 if (Entry.DerivedCtor) { 8131 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8132 // Only diagnose this once per constructor. 8133 if (Entry.DerivedCtor->isInvalidDecl()) 8134 return; 8135 Entry.DerivedCtor->setInvalidDecl(); 8136 8137 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8138 SemaRef.Diag(BaseCtor->getLocation(), 8139 diag::note_using_decl_constructor_conflict_current_ctor); 8140 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8141 diag::note_using_decl_constructor_conflict_previous_ctor); 8142 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8143 diag::note_using_decl_constructor_conflict_previous_using); 8144 } else { 8145 // Core issue (no number): if the same inheriting constructor is 8146 // produced by multiple base class constructors from the same base 8147 // class, the inheriting constructor is defined as deleted. 8148 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8149 } 8150 8151 return; 8152 } 8153 8154 ASTContext &Context = SemaRef.Context; 8155 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8156 Context.getCanonicalType(Context.getRecordType(Derived))); 8157 DeclarationNameInfo NameInfo(Name, UsingLoc); 8158 8159 TemplateParameterList *TemplateParams = 0; 8160 if (const FunctionTemplateDecl *FTD = 8161 BaseCtor->getDescribedFunctionTemplate()) { 8162 TemplateParams = FTD->getTemplateParameters(); 8163 // We're reusing template parameters from a different DeclContext. This 8164 // is questionable at best, but works out because the template depth in 8165 // both places is guaranteed to be 0. 8166 // FIXME: Rebuild the template parameters in the new context, and 8167 // transform the function type to refer to them. 8168 } 8169 8170 // Build type source info pointing at the using-declaration. This is 8171 // required by template instantiation. 8172 TypeSourceInfo *TInfo = 8173 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8174 FunctionProtoTypeLoc ProtoLoc = 8175 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8176 8177 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8178 Context, Derived, UsingLoc, NameInfo, DerivedType, 8179 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8180 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8181 8182 // Build an unevaluated exception specification for this constructor. 8183 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8184 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8185 EPI.ExceptionSpecType = EST_Unevaluated; 8186 EPI.ExceptionSpecDecl = DerivedCtor; 8187 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8188 FPT->getArgTypes(), EPI)); 8189 8190 // Build the parameter declarations. 8191 SmallVector<ParmVarDecl *, 16> ParamDecls; 8192 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8193 TypeSourceInfo *TInfo = 8194 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8195 ParmVarDecl *PD = ParmVarDecl::Create( 8196 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8197 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8198 PD->setScopeInfo(0, I); 8199 PD->setImplicit(); 8200 ParamDecls.push_back(PD); 8201 ProtoLoc.setArg(I, PD); 8202 } 8203 8204 // Set up the new constructor. 8205 DerivedCtor->setAccess(BaseCtor->getAccess()); 8206 DerivedCtor->setParams(ParamDecls); 8207 DerivedCtor->setInheritedConstructor(BaseCtor); 8208 if (BaseCtor->isDeleted()) 8209 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8210 8211 // If this is a constructor template, build the template declaration. 8212 if (TemplateParams) { 8213 FunctionTemplateDecl *DerivedTemplate = 8214 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8215 TemplateParams, DerivedCtor); 8216 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8217 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8218 Derived->addDecl(DerivedTemplate); 8219 } else { 8220 Derived->addDecl(DerivedCtor); 8221 } 8222 8223 Entry.BaseCtor = BaseCtor; 8224 Entry.DerivedCtor = DerivedCtor; 8225 } 8226 8227 Sema &SemaRef; 8228 CXXRecordDecl *Derived; 8229 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8230 MapType Map; 8231}; 8232} 8233 8234void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8235 // Defer declaring the inheriting constructors until the class is 8236 // instantiated. 8237 if (ClassDecl->isDependentContext()) 8238 return; 8239 8240 // Find base classes from which we might inherit constructors. 8241 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8242 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8243 BaseE = ClassDecl->bases_end(); 8244 BaseIt != BaseE; ++BaseIt) 8245 if (BaseIt->getInheritConstructors()) 8246 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8247 8248 // Go no further if we're not inheriting any constructors. 8249 if (InheritedBases.empty()) 8250 return; 8251 8252 // Declare the inherited constructors. 8253 InheritingConstructorInfo ICI(*this, ClassDecl); 8254 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8255 ICI.inheritAll(InheritedBases[I]); 8256} 8257 8258void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8259 CXXConstructorDecl *Constructor) { 8260 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8261 assert(Constructor->getInheritedConstructor() && 8262 !Constructor->doesThisDeclarationHaveABody() && 8263 !Constructor->isDeleted()); 8264 8265 SynthesizedFunctionScope Scope(*this, Constructor); 8266 DiagnosticErrorTrap Trap(Diags); 8267 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8268 Trap.hasErrorOccurred()) { 8269 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8270 << Context.getTagDeclType(ClassDecl); 8271 Constructor->setInvalidDecl(); 8272 return; 8273 } 8274 8275 SourceLocation Loc = Constructor->getLocation(); 8276 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8277 8278 Constructor->setUsed(); 8279 MarkVTableUsed(CurrentLocation, ClassDecl); 8280 8281 if (ASTMutationListener *L = getASTMutationListener()) { 8282 L->CompletedImplicitDefinition(Constructor); 8283 } 8284} 8285 8286 8287Sema::ImplicitExceptionSpecification 8288Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8289 CXXRecordDecl *ClassDecl = MD->getParent(); 8290 8291 // C++ [except.spec]p14: 8292 // An implicitly declared special member function (Clause 12) shall have 8293 // an exception-specification. 8294 ImplicitExceptionSpecification ExceptSpec(*this); 8295 if (ClassDecl->isInvalidDecl()) 8296 return ExceptSpec; 8297 8298 // Direct base-class destructors. 8299 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8300 BEnd = ClassDecl->bases_end(); 8301 B != BEnd; ++B) { 8302 if (B->isVirtual()) // Handled below. 8303 continue; 8304 8305 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8306 ExceptSpec.CalledDecl(B->getLocStart(), 8307 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8308 } 8309 8310 // Virtual base-class destructors. 8311 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8312 BEnd = ClassDecl->vbases_end(); 8313 B != BEnd; ++B) { 8314 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8315 ExceptSpec.CalledDecl(B->getLocStart(), 8316 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8317 } 8318 8319 // Field destructors. 8320 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8321 FEnd = ClassDecl->field_end(); 8322 F != FEnd; ++F) { 8323 if (const RecordType *RecordTy 8324 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8325 ExceptSpec.CalledDecl(F->getLocation(), 8326 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8327 } 8328 8329 return ExceptSpec; 8330} 8331 8332CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8333 // C++ [class.dtor]p2: 8334 // If a class has no user-declared destructor, a destructor is 8335 // declared implicitly. An implicitly-declared destructor is an 8336 // inline public member of its class. 8337 assert(ClassDecl->needsImplicitDestructor()); 8338 8339 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8340 if (DSM.isAlreadyBeingDeclared()) 8341 return 0; 8342 8343 // Create the actual destructor declaration. 8344 CanQualType ClassType 8345 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8346 SourceLocation ClassLoc = ClassDecl->getLocation(); 8347 DeclarationName Name 8348 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8349 DeclarationNameInfo NameInfo(Name, ClassLoc); 8350 CXXDestructorDecl *Destructor 8351 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8352 QualType(), 0, /*isInline=*/true, 8353 /*isImplicitlyDeclared=*/true); 8354 Destructor->setAccess(AS_public); 8355 Destructor->setDefaulted(); 8356 Destructor->setImplicit(); 8357 8358 // Build an exception specification pointing back at this destructor. 8359 FunctionProtoType::ExtProtoInfo EPI; 8360 EPI.ExceptionSpecType = EST_Unevaluated; 8361 EPI.ExceptionSpecDecl = Destructor; 8362 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8363 8364 AddOverriddenMethods(ClassDecl, Destructor); 8365 8366 // We don't need to use SpecialMemberIsTrivial here; triviality for 8367 // destructors is easy to compute. 8368 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8369 8370 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8371 SetDeclDeleted(Destructor, ClassLoc); 8372 8373 // Note that we have declared this destructor. 8374 ++ASTContext::NumImplicitDestructorsDeclared; 8375 8376 // Introduce this destructor into its scope. 8377 if (Scope *S = getScopeForContext(ClassDecl)) 8378 PushOnScopeChains(Destructor, S, false); 8379 ClassDecl->addDecl(Destructor); 8380 8381 return Destructor; 8382} 8383 8384void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8385 CXXDestructorDecl *Destructor) { 8386 assert((Destructor->isDefaulted() && 8387 !Destructor->doesThisDeclarationHaveABody() && 8388 !Destructor->isDeleted()) && 8389 "DefineImplicitDestructor - call it for implicit default dtor"); 8390 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8391 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8392 8393 if (Destructor->isInvalidDecl()) 8394 return; 8395 8396 SynthesizedFunctionScope Scope(*this, Destructor); 8397 8398 DiagnosticErrorTrap Trap(Diags); 8399 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8400 Destructor->getParent()); 8401 8402 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8403 Diag(CurrentLocation, diag::note_member_synthesized_at) 8404 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8405 8406 Destructor->setInvalidDecl(); 8407 return; 8408 } 8409 8410 SourceLocation Loc = Destructor->getLocation(); 8411 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8412 Destructor->setUsed(); 8413 MarkVTableUsed(CurrentLocation, ClassDecl); 8414 8415 if (ASTMutationListener *L = getASTMutationListener()) { 8416 L->CompletedImplicitDefinition(Destructor); 8417 } 8418} 8419 8420/// \brief Perform any semantic analysis which needs to be delayed until all 8421/// pending class member declarations have been parsed. 8422void Sema::ActOnFinishCXXMemberDecls() { 8423 // If the context is an invalid C++ class, just suppress these checks. 8424 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8425 if (Record->isInvalidDecl()) { 8426 DelayedDestructorExceptionSpecChecks.clear(); 8427 return; 8428 } 8429 } 8430 8431 // Perform any deferred checking of exception specifications for virtual 8432 // destructors. 8433 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8434 i != e; ++i) { 8435 const CXXDestructorDecl *Dtor = 8436 DelayedDestructorExceptionSpecChecks[i].first; 8437 assert(!Dtor->getParent()->isDependentType() && 8438 "Should not ever add destructors of templates into the list."); 8439 CheckOverridingFunctionExceptionSpec(Dtor, 8440 DelayedDestructorExceptionSpecChecks[i].second); 8441 } 8442 DelayedDestructorExceptionSpecChecks.clear(); 8443} 8444 8445void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8446 CXXDestructorDecl *Destructor) { 8447 assert(getLangOpts().CPlusPlus11 && 8448 "adjusting dtor exception specs was introduced in c++11"); 8449 8450 // C++11 [class.dtor]p3: 8451 // A declaration of a destructor that does not have an exception- 8452 // specification is implicitly considered to have the same exception- 8453 // specification as an implicit declaration. 8454 const FunctionProtoType *DtorType = Destructor->getType()-> 8455 getAs<FunctionProtoType>(); 8456 if (DtorType->hasExceptionSpec()) 8457 return; 8458 8459 // Replace the destructor's type, building off the existing one. Fortunately, 8460 // the only thing of interest in the destructor type is its extended info. 8461 // The return and arguments are fixed. 8462 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8463 EPI.ExceptionSpecType = EST_Unevaluated; 8464 EPI.ExceptionSpecDecl = Destructor; 8465 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8466 8467 // FIXME: If the destructor has a body that could throw, and the newly created 8468 // spec doesn't allow exceptions, we should emit a warning, because this 8469 // change in behavior can break conforming C++03 programs at runtime. 8470 // However, we don't have a body or an exception specification yet, so it 8471 // needs to be done somewhere else. 8472} 8473 8474/// When generating a defaulted copy or move assignment operator, if a field 8475/// should be copied with __builtin_memcpy rather than via explicit assignments, 8476/// do so. This optimization only applies for arrays of scalars, and for arrays 8477/// of class type where the selected copy/move-assignment operator is trivial. 8478static StmtResult 8479buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8480 Expr *To, Expr *From) { 8481 // Compute the size of the memory buffer to be copied. 8482 QualType SizeType = S.Context.getSizeType(); 8483 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8484 S.Context.getTypeSizeInChars(T).getQuantity()); 8485 8486 // Take the address of the field references for "from" and "to". We 8487 // directly construct UnaryOperators here because semantic analysis 8488 // does not permit us to take the address of an xvalue. 8489 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8490 S.Context.getPointerType(From->getType()), 8491 VK_RValue, OK_Ordinary, Loc); 8492 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8493 S.Context.getPointerType(To->getType()), 8494 VK_RValue, OK_Ordinary, Loc); 8495 8496 const Type *E = T->getBaseElementTypeUnsafe(); 8497 bool NeedsCollectableMemCpy = 8498 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8499 8500 // Create a reference to the __builtin_objc_memmove_collectable function 8501 StringRef MemCpyName = NeedsCollectableMemCpy ? 8502 "__builtin_objc_memmove_collectable" : 8503 "__builtin_memcpy"; 8504 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8505 Sema::LookupOrdinaryName); 8506 S.LookupName(R, S.TUScope, true); 8507 8508 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8509 if (!MemCpy) 8510 // Something went horribly wrong earlier, and we will have complained 8511 // about it. 8512 return StmtError(); 8513 8514 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8515 VK_RValue, Loc, 0); 8516 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8517 8518 Expr *CallArgs[] = { 8519 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8520 }; 8521 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8522 Loc, CallArgs, Loc); 8523 8524 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8525 return S.Owned(Call.takeAs<Stmt>()); 8526} 8527 8528/// \brief Builds a statement that copies/moves the given entity from \p From to 8529/// \c To. 8530/// 8531/// This routine is used to copy/move the members of a class with an 8532/// implicitly-declared copy/move assignment operator. When the entities being 8533/// copied are arrays, this routine builds for loops to copy them. 8534/// 8535/// \param S The Sema object used for type-checking. 8536/// 8537/// \param Loc The location where the implicit copy/move is being generated. 8538/// 8539/// \param T The type of the expressions being copied/moved. Both expressions 8540/// must have this type. 8541/// 8542/// \param To The expression we are copying/moving to. 8543/// 8544/// \param From The expression we are copying/moving from. 8545/// 8546/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8547/// Otherwise, it's a non-static member subobject. 8548/// 8549/// \param Copying Whether we're copying or moving. 8550/// 8551/// \param Depth Internal parameter recording the depth of the recursion. 8552/// 8553/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8554/// if a memcpy should be used instead. 8555static StmtResult 8556buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8557 Expr *To, Expr *From, 8558 bool CopyingBaseSubobject, bool Copying, 8559 unsigned Depth = 0) { 8560 // C++11 [class.copy]p28: 8561 // Each subobject is assigned in the manner appropriate to its type: 8562 // 8563 // - if the subobject is of class type, as if by a call to operator= with 8564 // the subobject as the object expression and the corresponding 8565 // subobject of x as a single function argument (as if by explicit 8566 // qualification; that is, ignoring any possible virtual overriding 8567 // functions in more derived classes); 8568 // 8569 // C++03 [class.copy]p13: 8570 // - if the subobject is of class type, the copy assignment operator for 8571 // the class is used (as if by explicit qualification; that is, 8572 // ignoring any possible virtual overriding functions in more derived 8573 // classes); 8574 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8575 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8576 8577 // Look for operator=. 8578 DeclarationName Name 8579 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8580 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8581 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8582 8583 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8584 // operator. 8585 if (!S.getLangOpts().CPlusPlus11) { 8586 LookupResult::Filter F = OpLookup.makeFilter(); 8587 while (F.hasNext()) { 8588 NamedDecl *D = F.next(); 8589 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8590 if (Method->isCopyAssignmentOperator() || 8591 (!Copying && Method->isMoveAssignmentOperator())) 8592 continue; 8593 8594 F.erase(); 8595 } 8596 F.done(); 8597 } 8598 8599 // Suppress the protected check (C++ [class.protected]) for each of the 8600 // assignment operators we found. This strange dance is required when 8601 // we're assigning via a base classes's copy-assignment operator. To 8602 // ensure that we're getting the right base class subobject (without 8603 // ambiguities), we need to cast "this" to that subobject type; to 8604 // ensure that we don't go through the virtual call mechanism, we need 8605 // to qualify the operator= name with the base class (see below). However, 8606 // this means that if the base class has a protected copy assignment 8607 // operator, the protected member access check will fail. So, we 8608 // rewrite "protected" access to "public" access in this case, since we 8609 // know by construction that we're calling from a derived class. 8610 if (CopyingBaseSubobject) { 8611 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8612 L != LEnd; ++L) { 8613 if (L.getAccess() == AS_protected) 8614 L.setAccess(AS_public); 8615 } 8616 } 8617 8618 // Create the nested-name-specifier that will be used to qualify the 8619 // reference to operator=; this is required to suppress the virtual 8620 // call mechanism. 8621 CXXScopeSpec SS; 8622 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8623 SS.MakeTrivial(S.Context, 8624 NestedNameSpecifier::Create(S.Context, 0, false, 8625 CanonicalT), 8626 Loc); 8627 8628 // Create the reference to operator=. 8629 ExprResult OpEqualRef 8630 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8631 /*TemplateKWLoc=*/SourceLocation(), 8632 /*FirstQualifierInScope=*/0, 8633 OpLookup, 8634 /*TemplateArgs=*/0, 8635 /*SuppressQualifierCheck=*/true); 8636 if (OpEqualRef.isInvalid()) 8637 return StmtError(); 8638 8639 // Build the call to the assignment operator. 8640 8641 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8642 OpEqualRef.takeAs<Expr>(), 8643 Loc, From, Loc); 8644 if (Call.isInvalid()) 8645 return StmtError(); 8646 8647 // If we built a call to a trivial 'operator=' while copying an array, 8648 // bail out. We'll replace the whole shebang with a memcpy. 8649 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8650 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8651 return StmtResult((Stmt*)0); 8652 8653 // Convert to an expression-statement, and clean up any produced 8654 // temporaries. 8655 return S.ActOnExprStmt(Call); 8656 } 8657 8658 // - if the subobject is of scalar type, the built-in assignment 8659 // operator is used. 8660 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8661 if (!ArrayTy) { 8662 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8663 if (Assignment.isInvalid()) 8664 return StmtError(); 8665 return S.ActOnExprStmt(Assignment); 8666 } 8667 8668 // - if the subobject is an array, each element is assigned, in the 8669 // manner appropriate to the element type; 8670 8671 // Construct a loop over the array bounds, e.g., 8672 // 8673 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8674 // 8675 // that will copy each of the array elements. 8676 QualType SizeType = S.Context.getSizeType(); 8677 8678 // Create the iteration variable. 8679 IdentifierInfo *IterationVarName = 0; 8680 { 8681 SmallString<8> Str; 8682 llvm::raw_svector_ostream OS(Str); 8683 OS << "__i" << Depth; 8684 IterationVarName = &S.Context.Idents.get(OS.str()); 8685 } 8686 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8687 IterationVarName, SizeType, 8688 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8689 SC_None); 8690 8691 // Initialize the iteration variable to zero. 8692 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8693 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8694 8695 // Create a reference to the iteration variable; we'll use this several 8696 // times throughout. 8697 Expr *IterationVarRef 8698 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8699 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8700 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8701 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8702 8703 // Create the DeclStmt that holds the iteration variable. 8704 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8705 8706 // Subscript the "from" and "to" expressions with the iteration variable. 8707 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8708 IterationVarRefRVal, 8709 Loc)); 8710 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8711 IterationVarRefRVal, 8712 Loc)); 8713 if (!Copying) // Cast to rvalue 8714 From = CastForMoving(S, From); 8715 8716 // Build the copy/move for an individual element of the array. 8717 StmtResult Copy = 8718 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8719 To, From, CopyingBaseSubobject, 8720 Copying, Depth + 1); 8721 // Bail out if copying fails or if we determined that we should use memcpy. 8722 if (Copy.isInvalid() || !Copy.get()) 8723 return Copy; 8724 8725 // Create the comparison against the array bound. 8726 llvm::APInt Upper 8727 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8728 Expr *Comparison 8729 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8730 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8731 BO_NE, S.Context.BoolTy, 8732 VK_RValue, OK_Ordinary, Loc, false); 8733 8734 // Create the pre-increment of the iteration variable. 8735 Expr *Increment 8736 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8737 VK_LValue, OK_Ordinary, Loc); 8738 8739 // Construct the loop that copies all elements of this array. 8740 return S.ActOnForStmt(Loc, Loc, InitStmt, 8741 S.MakeFullExpr(Comparison), 8742 0, S.MakeFullDiscardedValueExpr(Increment), 8743 Loc, Copy.take()); 8744} 8745 8746static StmtResult 8747buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8748 Expr *To, Expr *From, 8749 bool CopyingBaseSubobject, bool Copying) { 8750 // Maybe we should use a memcpy? 8751 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8752 T.isTriviallyCopyableType(S.Context)) 8753 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8754 8755 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8756 CopyingBaseSubobject, 8757 Copying, 0)); 8758 8759 // If we ended up picking a trivial assignment operator for an array of a 8760 // non-trivially-copyable class type, just emit a memcpy. 8761 if (!Result.isInvalid() && !Result.get()) 8762 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8763 8764 return Result; 8765} 8766 8767Sema::ImplicitExceptionSpecification 8768Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8769 CXXRecordDecl *ClassDecl = MD->getParent(); 8770 8771 ImplicitExceptionSpecification ExceptSpec(*this); 8772 if (ClassDecl->isInvalidDecl()) 8773 return ExceptSpec; 8774 8775 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8776 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8777 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8778 8779 // C++ [except.spec]p14: 8780 // An implicitly declared special member function (Clause 12) shall have an 8781 // exception-specification. [...] 8782 8783 // It is unspecified whether or not an implicit copy assignment operator 8784 // attempts to deduplicate calls to assignment operators of virtual bases are 8785 // made. As such, this exception specification is effectively unspecified. 8786 // Based on a similar decision made for constness in C++0x, we're erring on 8787 // the side of assuming such calls to be made regardless of whether they 8788 // actually happen. 8789 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8790 BaseEnd = ClassDecl->bases_end(); 8791 Base != BaseEnd; ++Base) { 8792 if (Base->isVirtual()) 8793 continue; 8794 8795 CXXRecordDecl *BaseClassDecl 8796 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8797 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8798 ArgQuals, false, 0)) 8799 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8800 } 8801 8802 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8803 BaseEnd = ClassDecl->vbases_end(); 8804 Base != BaseEnd; ++Base) { 8805 CXXRecordDecl *BaseClassDecl 8806 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8807 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8808 ArgQuals, false, 0)) 8809 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8810 } 8811 8812 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8813 FieldEnd = ClassDecl->field_end(); 8814 Field != FieldEnd; 8815 ++Field) { 8816 QualType FieldType = Context.getBaseElementType(Field->getType()); 8817 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8818 if (CXXMethodDecl *CopyAssign = 8819 LookupCopyingAssignment(FieldClassDecl, 8820 ArgQuals | FieldType.getCVRQualifiers(), 8821 false, 0)) 8822 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8823 } 8824 } 8825 8826 return ExceptSpec; 8827} 8828 8829CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8830 // Note: The following rules are largely analoguous to the copy 8831 // constructor rules. Note that virtual bases are not taken into account 8832 // for determining the argument type of the operator. Note also that 8833 // operators taking an object instead of a reference are allowed. 8834 assert(ClassDecl->needsImplicitCopyAssignment()); 8835 8836 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8837 if (DSM.isAlreadyBeingDeclared()) 8838 return 0; 8839 8840 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8841 QualType RetType = Context.getLValueReferenceType(ArgType); 8842 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 8843 if (Const) 8844 ArgType = ArgType.withConst(); 8845 ArgType = Context.getLValueReferenceType(ArgType); 8846 8847 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8848 CXXCopyAssignment, 8849 Const); 8850 8851 // An implicitly-declared copy assignment operator is an inline public 8852 // member of its class. 8853 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8854 SourceLocation ClassLoc = ClassDecl->getLocation(); 8855 DeclarationNameInfo NameInfo(Name, ClassLoc); 8856 CXXMethodDecl *CopyAssignment = 8857 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8858 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 8859 /*isInline=*/ true, Constexpr, SourceLocation()); 8860 CopyAssignment->setAccess(AS_public); 8861 CopyAssignment->setDefaulted(); 8862 CopyAssignment->setImplicit(); 8863 8864 // Build an exception specification pointing back at this member. 8865 FunctionProtoType::ExtProtoInfo EPI; 8866 EPI.ExceptionSpecType = EST_Unevaluated; 8867 EPI.ExceptionSpecDecl = CopyAssignment; 8868 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8869 8870 // Add the parameter to the operator. 8871 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8872 ClassLoc, ClassLoc, /*Id=*/0, 8873 ArgType, /*TInfo=*/0, 8874 SC_None, 0); 8875 CopyAssignment->setParams(FromParam); 8876 8877 AddOverriddenMethods(ClassDecl, CopyAssignment); 8878 8879 CopyAssignment->setTrivial( 8880 ClassDecl->needsOverloadResolutionForCopyAssignment() 8881 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8882 : ClassDecl->hasTrivialCopyAssignment()); 8883 8884 // C++11 [class.copy]p19: 8885 // .... If the class definition does not explicitly declare a copy 8886 // assignment operator, there is no user-declared move constructor, and 8887 // there is no user-declared move assignment operator, a copy assignment 8888 // operator is implicitly declared as defaulted. 8889 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8890 SetDeclDeleted(CopyAssignment, ClassLoc); 8891 8892 // Note that we have added this copy-assignment operator. 8893 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8894 8895 if (Scope *S = getScopeForContext(ClassDecl)) 8896 PushOnScopeChains(CopyAssignment, S, false); 8897 ClassDecl->addDecl(CopyAssignment); 8898 8899 return CopyAssignment; 8900} 8901 8902/// Diagnose an implicit copy operation for a class which is odr-used, but 8903/// which is deprecated because the class has a user-declared copy constructor, 8904/// copy assignment operator, or destructor. 8905static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 8906 SourceLocation UseLoc) { 8907 assert(CopyOp->isImplicit()); 8908 8909 CXXRecordDecl *RD = CopyOp->getParent(); 8910 CXXMethodDecl *UserDeclaredOperation = 0; 8911 8912 // In Microsoft mode, assignment operations don't affect constructors and 8913 // vice versa. 8914 if (RD->hasUserDeclaredDestructor()) { 8915 UserDeclaredOperation = RD->getDestructor(); 8916 } else if (!isa<CXXConstructorDecl>(CopyOp) && 8917 RD->hasUserDeclaredCopyConstructor() && 8918 !S.getLangOpts().MicrosoftMode) { 8919 // Find any user-declared copy constructor. 8920 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 8921 E = RD->ctor_end(); I != E; ++I) { 8922 if (I->isCopyConstructor()) { 8923 UserDeclaredOperation = *I; 8924 break; 8925 } 8926 } 8927 assert(UserDeclaredOperation); 8928 } else if (isa<CXXConstructorDecl>(CopyOp) && 8929 RD->hasUserDeclaredCopyAssignment() && 8930 !S.getLangOpts().MicrosoftMode) { 8931 // Find any user-declared move assignment operator. 8932 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 8933 E = RD->method_end(); I != E; ++I) { 8934 if (I->isCopyAssignmentOperator()) { 8935 UserDeclaredOperation = *I; 8936 break; 8937 } 8938 } 8939 assert(UserDeclaredOperation); 8940 } 8941 8942 if (UserDeclaredOperation) { 8943 S.Diag(UserDeclaredOperation->getLocation(), 8944 diag::warn_deprecated_copy_operation) 8945 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 8946 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 8947 S.Diag(UseLoc, diag::note_member_synthesized_at) 8948 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 8949 : Sema::CXXCopyAssignment) 8950 << RD; 8951 } 8952} 8953 8954void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8955 CXXMethodDecl *CopyAssignOperator) { 8956 assert((CopyAssignOperator->isDefaulted() && 8957 CopyAssignOperator->isOverloadedOperator() && 8958 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8959 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8960 !CopyAssignOperator->isDeleted()) && 8961 "DefineImplicitCopyAssignment called for wrong function"); 8962 8963 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8964 8965 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8966 CopyAssignOperator->setInvalidDecl(); 8967 return; 8968 } 8969 8970 // C++11 [class.copy]p18: 8971 // The [definition of an implicitly declared copy assignment operator] is 8972 // deprecated if the class has a user-declared copy constructor or a 8973 // user-declared destructor. 8974 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 8975 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 8976 8977 CopyAssignOperator->setUsed(); 8978 8979 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8980 DiagnosticErrorTrap Trap(Diags); 8981 8982 // C++0x [class.copy]p30: 8983 // The implicitly-defined or explicitly-defaulted copy assignment operator 8984 // for a non-union class X performs memberwise copy assignment of its 8985 // subobjects. The direct base classes of X are assigned first, in the 8986 // order of their declaration in the base-specifier-list, and then the 8987 // immediate non-static data members of X are assigned, in the order in 8988 // which they were declared in the class definition. 8989 8990 // The statements that form the synthesized function body. 8991 SmallVector<Stmt*, 8> Statements; 8992 8993 // The parameter for the "other" object, which we are copying from. 8994 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8995 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8996 QualType OtherRefType = Other->getType(); 8997 if (const LValueReferenceType *OtherRef 8998 = OtherRefType->getAs<LValueReferenceType>()) { 8999 OtherRefType = OtherRef->getPointeeType(); 9000 OtherQuals = OtherRefType.getQualifiers(); 9001 } 9002 9003 // Our location for everything implicitly-generated. 9004 SourceLocation Loc = CopyAssignOperator->getLocation(); 9005 9006 // Construct a reference to the "other" object. We'll be using this 9007 // throughout the generated ASTs. 9008 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9009 assert(OtherRef && "Reference to parameter cannot fail!"); 9010 9011 // Construct the "this" pointer. We'll be using this throughout the generated 9012 // ASTs. 9013 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9014 assert(This && "Reference to this cannot fail!"); 9015 9016 // Assign base classes. 9017 bool Invalid = false; 9018 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9019 E = ClassDecl->bases_end(); Base != E; ++Base) { 9020 // Form the assignment: 9021 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9022 QualType BaseType = Base->getType().getUnqualifiedType(); 9023 if (!BaseType->isRecordType()) { 9024 Invalid = true; 9025 continue; 9026 } 9027 9028 CXXCastPath BasePath; 9029 BasePath.push_back(Base); 9030 9031 // Construct the "from" expression, which is an implicit cast to the 9032 // appropriately-qualified base type. 9033 Expr *From = OtherRef; 9034 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 9035 CK_UncheckedDerivedToBase, 9036 VK_LValue, &BasePath).take(); 9037 9038 // Dereference "this". 9039 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9040 9041 // Implicitly cast "this" to the appropriately-qualified base type. 9042 To = ImpCastExprToType(To.take(), 9043 Context.getCVRQualifiedType(BaseType, 9044 CopyAssignOperator->getTypeQualifiers()), 9045 CK_UncheckedDerivedToBase, 9046 VK_LValue, &BasePath); 9047 9048 // Build the copy. 9049 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9050 To.get(), From, 9051 /*CopyingBaseSubobject=*/true, 9052 /*Copying=*/true); 9053 if (Copy.isInvalid()) { 9054 Diag(CurrentLocation, diag::note_member_synthesized_at) 9055 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9056 CopyAssignOperator->setInvalidDecl(); 9057 return; 9058 } 9059 9060 // Success! Record the copy. 9061 Statements.push_back(Copy.takeAs<Expr>()); 9062 } 9063 9064 // Assign non-static members. 9065 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9066 FieldEnd = ClassDecl->field_end(); 9067 Field != FieldEnd; ++Field) { 9068 if (Field->isUnnamedBitfield()) 9069 continue; 9070 9071 if (Field->isInvalidDecl()) { 9072 Invalid = true; 9073 continue; 9074 } 9075 9076 // Check for members of reference type; we can't copy those. 9077 if (Field->getType()->isReferenceType()) { 9078 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9079 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9080 Diag(Field->getLocation(), diag::note_declared_at); 9081 Diag(CurrentLocation, diag::note_member_synthesized_at) 9082 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9083 Invalid = true; 9084 continue; 9085 } 9086 9087 // Check for members of const-qualified, non-class type. 9088 QualType BaseType = Context.getBaseElementType(Field->getType()); 9089 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9090 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9091 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9092 Diag(Field->getLocation(), diag::note_declared_at); 9093 Diag(CurrentLocation, diag::note_member_synthesized_at) 9094 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9095 Invalid = true; 9096 continue; 9097 } 9098 9099 // Suppress assigning zero-width bitfields. 9100 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9101 continue; 9102 9103 QualType FieldType = Field->getType().getNonReferenceType(); 9104 if (FieldType->isIncompleteArrayType()) { 9105 assert(ClassDecl->hasFlexibleArrayMember() && 9106 "Incomplete array type is not valid"); 9107 continue; 9108 } 9109 9110 // Build references to the field in the object we're copying from and to. 9111 CXXScopeSpec SS; // Intentionally empty 9112 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9113 LookupMemberName); 9114 MemberLookup.addDecl(*Field); 9115 MemberLookup.resolveKind(); 9116 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9117 Loc, /*IsArrow=*/false, 9118 SS, SourceLocation(), 0, 9119 MemberLookup, 0); 9120 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9121 Loc, /*IsArrow=*/true, 9122 SS, SourceLocation(), 0, 9123 MemberLookup, 0); 9124 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9125 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9126 9127 // Build the copy of this field. 9128 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9129 To.get(), From.get(), 9130 /*CopyingBaseSubobject=*/false, 9131 /*Copying=*/true); 9132 if (Copy.isInvalid()) { 9133 Diag(CurrentLocation, diag::note_member_synthesized_at) 9134 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9135 CopyAssignOperator->setInvalidDecl(); 9136 return; 9137 } 9138 9139 // Success! Record the copy. 9140 Statements.push_back(Copy.takeAs<Stmt>()); 9141 } 9142 9143 if (!Invalid) { 9144 // Add a "return *this;" 9145 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9146 9147 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9148 if (Return.isInvalid()) 9149 Invalid = true; 9150 else { 9151 Statements.push_back(Return.takeAs<Stmt>()); 9152 9153 if (Trap.hasErrorOccurred()) { 9154 Diag(CurrentLocation, diag::note_member_synthesized_at) 9155 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9156 Invalid = true; 9157 } 9158 } 9159 } 9160 9161 if (Invalid) { 9162 CopyAssignOperator->setInvalidDecl(); 9163 return; 9164 } 9165 9166 StmtResult Body; 9167 { 9168 CompoundScopeRAII CompoundScope(*this); 9169 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9170 /*isStmtExpr=*/false); 9171 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9172 } 9173 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9174 9175 if (ASTMutationListener *L = getASTMutationListener()) { 9176 L->CompletedImplicitDefinition(CopyAssignOperator); 9177 } 9178} 9179 9180Sema::ImplicitExceptionSpecification 9181Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9182 CXXRecordDecl *ClassDecl = MD->getParent(); 9183 9184 ImplicitExceptionSpecification ExceptSpec(*this); 9185 if (ClassDecl->isInvalidDecl()) 9186 return ExceptSpec; 9187 9188 // C++0x [except.spec]p14: 9189 // An implicitly declared special member function (Clause 12) shall have an 9190 // exception-specification. [...] 9191 9192 // It is unspecified whether or not an implicit move assignment operator 9193 // attempts to deduplicate calls to assignment operators of virtual bases are 9194 // made. As such, this exception specification is effectively unspecified. 9195 // Based on a similar decision made for constness in C++0x, we're erring on 9196 // the side of assuming such calls to be made regardless of whether they 9197 // actually happen. 9198 // Note that a move constructor is not implicitly declared when there are 9199 // virtual bases, but it can still be user-declared and explicitly defaulted. 9200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9201 BaseEnd = ClassDecl->bases_end(); 9202 Base != BaseEnd; ++Base) { 9203 if (Base->isVirtual()) 9204 continue; 9205 9206 CXXRecordDecl *BaseClassDecl 9207 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9208 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9209 0, false, 0)) 9210 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9211 } 9212 9213 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9214 BaseEnd = ClassDecl->vbases_end(); 9215 Base != BaseEnd; ++Base) { 9216 CXXRecordDecl *BaseClassDecl 9217 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9218 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9219 0, false, 0)) 9220 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9221 } 9222 9223 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9224 FieldEnd = ClassDecl->field_end(); 9225 Field != FieldEnd; 9226 ++Field) { 9227 QualType FieldType = Context.getBaseElementType(Field->getType()); 9228 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9229 if (CXXMethodDecl *MoveAssign = 9230 LookupMovingAssignment(FieldClassDecl, 9231 FieldType.getCVRQualifiers(), 9232 false, 0)) 9233 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9234 } 9235 } 9236 9237 return ExceptSpec; 9238} 9239 9240/// Determine whether the class type has any direct or indirect virtual base 9241/// classes which have a non-trivial move assignment operator. 9242static bool 9243hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9244 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9245 BaseEnd = ClassDecl->vbases_end(); 9246 Base != BaseEnd; ++Base) { 9247 CXXRecordDecl *BaseClass = 9248 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9249 9250 // Try to declare the move assignment. If it would be deleted, then the 9251 // class does not have a non-trivial move assignment. 9252 if (BaseClass->needsImplicitMoveAssignment()) 9253 S.DeclareImplicitMoveAssignment(BaseClass); 9254 9255 if (BaseClass->hasNonTrivialMoveAssignment()) 9256 return true; 9257 } 9258 9259 return false; 9260} 9261 9262/// Determine whether the given type either has a move constructor or is 9263/// trivially copyable. 9264static bool 9265hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9266 Type = S.Context.getBaseElementType(Type); 9267 9268 // FIXME: Technically, non-trivially-copyable non-class types, such as 9269 // reference types, are supposed to return false here, but that appears 9270 // to be a standard defect. 9271 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9272 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9273 return true; 9274 9275 if (Type.isTriviallyCopyableType(S.Context)) 9276 return true; 9277 9278 if (IsConstructor) { 9279 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9280 // give the right answer. 9281 if (ClassDecl->needsImplicitMoveConstructor()) 9282 S.DeclareImplicitMoveConstructor(ClassDecl); 9283 return ClassDecl->hasMoveConstructor(); 9284 } 9285 9286 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9287 // give the right answer. 9288 if (ClassDecl->needsImplicitMoveAssignment()) 9289 S.DeclareImplicitMoveAssignment(ClassDecl); 9290 return ClassDecl->hasMoveAssignment(); 9291} 9292 9293/// Determine whether all non-static data members and direct or virtual bases 9294/// of class \p ClassDecl have either a move operation, or are trivially 9295/// copyable. 9296static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9297 bool IsConstructor) { 9298 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9299 BaseEnd = ClassDecl->bases_end(); 9300 Base != BaseEnd; ++Base) { 9301 if (Base->isVirtual()) 9302 continue; 9303 9304 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9305 return false; 9306 } 9307 9308 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9309 BaseEnd = ClassDecl->vbases_end(); 9310 Base != BaseEnd; ++Base) { 9311 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9312 return false; 9313 } 9314 9315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9316 FieldEnd = ClassDecl->field_end(); 9317 Field != FieldEnd; ++Field) { 9318 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9319 return false; 9320 } 9321 9322 return true; 9323} 9324 9325CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9326 // C++11 [class.copy]p20: 9327 // If the definition of a class X does not explicitly declare a move 9328 // assignment operator, one will be implicitly declared as defaulted 9329 // if and only if: 9330 // 9331 // - [first 4 bullets] 9332 assert(ClassDecl->needsImplicitMoveAssignment()); 9333 9334 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9335 if (DSM.isAlreadyBeingDeclared()) 9336 return 0; 9337 9338 // [Checked after we build the declaration] 9339 // - the move assignment operator would not be implicitly defined as 9340 // deleted, 9341 9342 // [DR1402]: 9343 // - X has no direct or indirect virtual base class with a non-trivial 9344 // move assignment operator, and 9345 // - each of X's non-static data members and direct or virtual base classes 9346 // has a type that either has a move assignment operator or is trivially 9347 // copyable. 9348 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9349 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9350 ClassDecl->setFailedImplicitMoveAssignment(); 9351 return 0; 9352 } 9353 9354 // Note: The following rules are largely analoguous to the move 9355 // constructor rules. 9356 9357 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9358 QualType RetType = Context.getLValueReferenceType(ArgType); 9359 ArgType = Context.getRValueReferenceType(ArgType); 9360 9361 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9362 CXXMoveAssignment, 9363 false); 9364 9365 // An implicitly-declared move assignment operator is an inline public 9366 // member of its class. 9367 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9368 SourceLocation ClassLoc = ClassDecl->getLocation(); 9369 DeclarationNameInfo NameInfo(Name, ClassLoc); 9370 CXXMethodDecl *MoveAssignment = 9371 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9372 /*TInfo=*/0, /*StorageClass=*/SC_None, 9373 /*isInline=*/true, Constexpr, SourceLocation()); 9374 MoveAssignment->setAccess(AS_public); 9375 MoveAssignment->setDefaulted(); 9376 MoveAssignment->setImplicit(); 9377 9378 // Build an exception specification pointing back at this member. 9379 FunctionProtoType::ExtProtoInfo EPI; 9380 EPI.ExceptionSpecType = EST_Unevaluated; 9381 EPI.ExceptionSpecDecl = MoveAssignment; 9382 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9383 9384 // Add the parameter to the operator. 9385 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9386 ClassLoc, ClassLoc, /*Id=*/0, 9387 ArgType, /*TInfo=*/0, 9388 SC_None, 0); 9389 MoveAssignment->setParams(FromParam); 9390 9391 AddOverriddenMethods(ClassDecl, MoveAssignment); 9392 9393 MoveAssignment->setTrivial( 9394 ClassDecl->needsOverloadResolutionForMoveAssignment() 9395 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9396 : ClassDecl->hasTrivialMoveAssignment()); 9397 9398 // C++0x [class.copy]p9: 9399 // If the definition of a class X does not explicitly declare a move 9400 // assignment operator, one will be implicitly declared as defaulted if and 9401 // only if: 9402 // [...] 9403 // - the move assignment operator would not be implicitly defined as 9404 // deleted. 9405 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9406 // Cache this result so that we don't try to generate this over and over 9407 // on every lookup, leaking memory and wasting time. 9408 ClassDecl->setFailedImplicitMoveAssignment(); 9409 return 0; 9410 } 9411 9412 // Note that we have added this copy-assignment operator. 9413 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9414 9415 if (Scope *S = getScopeForContext(ClassDecl)) 9416 PushOnScopeChains(MoveAssignment, S, false); 9417 ClassDecl->addDecl(MoveAssignment); 9418 9419 return MoveAssignment; 9420} 9421 9422void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9423 CXXMethodDecl *MoveAssignOperator) { 9424 assert((MoveAssignOperator->isDefaulted() && 9425 MoveAssignOperator->isOverloadedOperator() && 9426 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9427 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9428 !MoveAssignOperator->isDeleted()) && 9429 "DefineImplicitMoveAssignment called for wrong function"); 9430 9431 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9432 9433 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9434 MoveAssignOperator->setInvalidDecl(); 9435 return; 9436 } 9437 9438 MoveAssignOperator->setUsed(); 9439 9440 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9441 DiagnosticErrorTrap Trap(Diags); 9442 9443 // C++0x [class.copy]p28: 9444 // The implicitly-defined or move assignment operator for a non-union class 9445 // X performs memberwise move assignment of its subobjects. The direct base 9446 // classes of X are assigned first, in the order of their declaration in the 9447 // base-specifier-list, and then the immediate non-static data members of X 9448 // are assigned, in the order in which they were declared in the class 9449 // definition. 9450 9451 // The statements that form the synthesized function body. 9452 SmallVector<Stmt*, 8> Statements; 9453 9454 // The parameter for the "other" object, which we are move from. 9455 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9456 QualType OtherRefType = Other->getType()-> 9457 getAs<RValueReferenceType>()->getPointeeType(); 9458 assert(!OtherRefType.getQualifiers() && 9459 "Bad argument type of defaulted move assignment"); 9460 9461 // Our location for everything implicitly-generated. 9462 SourceLocation Loc = MoveAssignOperator->getLocation(); 9463 9464 // Construct a reference to the "other" object. We'll be using this 9465 // throughout the generated ASTs. 9466 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9467 assert(OtherRef && "Reference to parameter cannot fail!"); 9468 // Cast to rvalue. 9469 OtherRef = CastForMoving(*this, OtherRef); 9470 9471 // Construct the "this" pointer. We'll be using this throughout the generated 9472 // ASTs. 9473 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9474 assert(This && "Reference to this cannot fail!"); 9475 9476 // Assign base classes. 9477 bool Invalid = false; 9478 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9479 E = ClassDecl->bases_end(); Base != E; ++Base) { 9480 // Form the assignment: 9481 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9482 QualType BaseType = Base->getType().getUnqualifiedType(); 9483 if (!BaseType->isRecordType()) { 9484 Invalid = true; 9485 continue; 9486 } 9487 9488 CXXCastPath BasePath; 9489 BasePath.push_back(Base); 9490 9491 // Construct the "from" expression, which is an implicit cast to the 9492 // appropriately-qualified base type. 9493 Expr *From = OtherRef; 9494 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9495 VK_XValue, &BasePath).take(); 9496 9497 // Dereference "this". 9498 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9499 9500 // Implicitly cast "this" to the appropriately-qualified base type. 9501 To = ImpCastExprToType(To.take(), 9502 Context.getCVRQualifiedType(BaseType, 9503 MoveAssignOperator->getTypeQualifiers()), 9504 CK_UncheckedDerivedToBase, 9505 VK_LValue, &BasePath); 9506 9507 // Build the move. 9508 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9509 To.get(), From, 9510 /*CopyingBaseSubobject=*/true, 9511 /*Copying=*/false); 9512 if (Move.isInvalid()) { 9513 Diag(CurrentLocation, diag::note_member_synthesized_at) 9514 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9515 MoveAssignOperator->setInvalidDecl(); 9516 return; 9517 } 9518 9519 // Success! Record the move. 9520 Statements.push_back(Move.takeAs<Expr>()); 9521 } 9522 9523 // Assign non-static members. 9524 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9525 FieldEnd = ClassDecl->field_end(); 9526 Field != FieldEnd; ++Field) { 9527 if (Field->isUnnamedBitfield()) 9528 continue; 9529 9530 if (Field->isInvalidDecl()) { 9531 Invalid = true; 9532 continue; 9533 } 9534 9535 // Check for members of reference type; we can't move those. 9536 if (Field->getType()->isReferenceType()) { 9537 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9538 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9539 Diag(Field->getLocation(), diag::note_declared_at); 9540 Diag(CurrentLocation, diag::note_member_synthesized_at) 9541 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9542 Invalid = true; 9543 continue; 9544 } 9545 9546 // Check for members of const-qualified, non-class type. 9547 QualType BaseType = Context.getBaseElementType(Field->getType()); 9548 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9549 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9550 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9551 Diag(Field->getLocation(), diag::note_declared_at); 9552 Diag(CurrentLocation, diag::note_member_synthesized_at) 9553 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9554 Invalid = true; 9555 continue; 9556 } 9557 9558 // Suppress assigning zero-width bitfields. 9559 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9560 continue; 9561 9562 QualType FieldType = Field->getType().getNonReferenceType(); 9563 if (FieldType->isIncompleteArrayType()) { 9564 assert(ClassDecl->hasFlexibleArrayMember() && 9565 "Incomplete array type is not valid"); 9566 continue; 9567 } 9568 9569 // Build references to the field in the object we're copying from and to. 9570 CXXScopeSpec SS; // Intentionally empty 9571 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9572 LookupMemberName); 9573 MemberLookup.addDecl(*Field); 9574 MemberLookup.resolveKind(); 9575 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9576 Loc, /*IsArrow=*/false, 9577 SS, SourceLocation(), 0, 9578 MemberLookup, 0); 9579 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9580 Loc, /*IsArrow=*/true, 9581 SS, SourceLocation(), 0, 9582 MemberLookup, 0); 9583 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9584 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9585 9586 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9587 "Member reference with rvalue base must be rvalue except for reference " 9588 "members, which aren't allowed for move assignment."); 9589 9590 // Build the move of this field. 9591 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9592 To.get(), From.get(), 9593 /*CopyingBaseSubobject=*/false, 9594 /*Copying=*/false); 9595 if (Move.isInvalid()) { 9596 Diag(CurrentLocation, diag::note_member_synthesized_at) 9597 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9598 MoveAssignOperator->setInvalidDecl(); 9599 return; 9600 } 9601 9602 // Success! Record the copy. 9603 Statements.push_back(Move.takeAs<Stmt>()); 9604 } 9605 9606 if (!Invalid) { 9607 // Add a "return *this;" 9608 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9609 9610 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9611 if (Return.isInvalid()) 9612 Invalid = true; 9613 else { 9614 Statements.push_back(Return.takeAs<Stmt>()); 9615 9616 if (Trap.hasErrorOccurred()) { 9617 Diag(CurrentLocation, diag::note_member_synthesized_at) 9618 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9619 Invalid = true; 9620 } 9621 } 9622 } 9623 9624 if (Invalid) { 9625 MoveAssignOperator->setInvalidDecl(); 9626 return; 9627 } 9628 9629 StmtResult Body; 9630 { 9631 CompoundScopeRAII CompoundScope(*this); 9632 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9633 /*isStmtExpr=*/false); 9634 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9635 } 9636 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9637 9638 if (ASTMutationListener *L = getASTMutationListener()) { 9639 L->CompletedImplicitDefinition(MoveAssignOperator); 9640 } 9641} 9642 9643Sema::ImplicitExceptionSpecification 9644Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9645 CXXRecordDecl *ClassDecl = MD->getParent(); 9646 9647 ImplicitExceptionSpecification ExceptSpec(*this); 9648 if (ClassDecl->isInvalidDecl()) 9649 return ExceptSpec; 9650 9651 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9652 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9653 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9654 9655 // C++ [except.spec]p14: 9656 // An implicitly declared special member function (Clause 12) shall have an 9657 // exception-specification. [...] 9658 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9659 BaseEnd = ClassDecl->bases_end(); 9660 Base != BaseEnd; 9661 ++Base) { 9662 // Virtual bases are handled below. 9663 if (Base->isVirtual()) 9664 continue; 9665 9666 CXXRecordDecl *BaseClassDecl 9667 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9668 if (CXXConstructorDecl *CopyConstructor = 9669 LookupCopyingConstructor(BaseClassDecl, Quals)) 9670 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9671 } 9672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9673 BaseEnd = ClassDecl->vbases_end(); 9674 Base != BaseEnd; 9675 ++Base) { 9676 CXXRecordDecl *BaseClassDecl 9677 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9678 if (CXXConstructorDecl *CopyConstructor = 9679 LookupCopyingConstructor(BaseClassDecl, Quals)) 9680 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9681 } 9682 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9683 FieldEnd = ClassDecl->field_end(); 9684 Field != FieldEnd; 9685 ++Field) { 9686 QualType FieldType = Context.getBaseElementType(Field->getType()); 9687 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9688 if (CXXConstructorDecl *CopyConstructor = 9689 LookupCopyingConstructor(FieldClassDecl, 9690 Quals | FieldType.getCVRQualifiers())) 9691 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9692 } 9693 } 9694 9695 return ExceptSpec; 9696} 9697 9698CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9699 CXXRecordDecl *ClassDecl) { 9700 // C++ [class.copy]p4: 9701 // If the class definition does not explicitly declare a copy 9702 // constructor, one is declared implicitly. 9703 assert(ClassDecl->needsImplicitCopyConstructor()); 9704 9705 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9706 if (DSM.isAlreadyBeingDeclared()) 9707 return 0; 9708 9709 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9710 QualType ArgType = ClassType; 9711 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9712 if (Const) 9713 ArgType = ArgType.withConst(); 9714 ArgType = Context.getLValueReferenceType(ArgType); 9715 9716 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9717 CXXCopyConstructor, 9718 Const); 9719 9720 DeclarationName Name 9721 = Context.DeclarationNames.getCXXConstructorName( 9722 Context.getCanonicalType(ClassType)); 9723 SourceLocation ClassLoc = ClassDecl->getLocation(); 9724 DeclarationNameInfo NameInfo(Name, ClassLoc); 9725 9726 // An implicitly-declared copy constructor is an inline public 9727 // member of its class. 9728 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9729 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9730 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9731 Constexpr); 9732 CopyConstructor->setAccess(AS_public); 9733 CopyConstructor->setDefaulted(); 9734 9735 // Build an exception specification pointing back at this member. 9736 FunctionProtoType::ExtProtoInfo EPI; 9737 EPI.ExceptionSpecType = EST_Unevaluated; 9738 EPI.ExceptionSpecDecl = CopyConstructor; 9739 CopyConstructor->setType( 9740 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9741 9742 // Add the parameter to the constructor. 9743 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9744 ClassLoc, ClassLoc, 9745 /*IdentifierInfo=*/0, 9746 ArgType, /*TInfo=*/0, 9747 SC_None, 0); 9748 CopyConstructor->setParams(FromParam); 9749 9750 CopyConstructor->setTrivial( 9751 ClassDecl->needsOverloadResolutionForCopyConstructor() 9752 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9753 : ClassDecl->hasTrivialCopyConstructor()); 9754 9755 // C++11 [class.copy]p8: 9756 // ... If the class definition does not explicitly declare a copy 9757 // constructor, there is no user-declared move constructor, and there is no 9758 // user-declared move assignment operator, a copy constructor is implicitly 9759 // declared as defaulted. 9760 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9761 SetDeclDeleted(CopyConstructor, ClassLoc); 9762 9763 // Note that we have declared this constructor. 9764 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9765 9766 if (Scope *S = getScopeForContext(ClassDecl)) 9767 PushOnScopeChains(CopyConstructor, S, false); 9768 ClassDecl->addDecl(CopyConstructor); 9769 9770 return CopyConstructor; 9771} 9772 9773void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9774 CXXConstructorDecl *CopyConstructor) { 9775 assert((CopyConstructor->isDefaulted() && 9776 CopyConstructor->isCopyConstructor() && 9777 !CopyConstructor->doesThisDeclarationHaveABody() && 9778 !CopyConstructor->isDeleted()) && 9779 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9780 9781 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9782 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9783 9784 // C++11 [class.copy]p7: 9785 // The [definition of an implicitly declared copy constructro] is 9786 // deprecated if the class has a user-declared copy assignment operator 9787 // or a user-declared destructor. 9788 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 9789 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 9790 9791 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9792 DiagnosticErrorTrap Trap(Diags); 9793 9794 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9795 Trap.hasErrorOccurred()) { 9796 Diag(CurrentLocation, diag::note_member_synthesized_at) 9797 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9798 CopyConstructor->setInvalidDecl(); 9799 } else { 9800 Sema::CompoundScopeRAII CompoundScope(*this); 9801 CopyConstructor->setBody(ActOnCompoundStmt( 9802 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None, 9803 /*isStmtExpr=*/ false).takeAs<Stmt>()); 9804 } 9805 9806 CopyConstructor->setUsed(); 9807 if (ASTMutationListener *L = getASTMutationListener()) { 9808 L->CompletedImplicitDefinition(CopyConstructor); 9809 } 9810} 9811 9812Sema::ImplicitExceptionSpecification 9813Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9814 CXXRecordDecl *ClassDecl = MD->getParent(); 9815 9816 // C++ [except.spec]p14: 9817 // An implicitly declared special member function (Clause 12) shall have an 9818 // exception-specification. [...] 9819 ImplicitExceptionSpecification ExceptSpec(*this); 9820 if (ClassDecl->isInvalidDecl()) 9821 return ExceptSpec; 9822 9823 // Direct base-class constructors. 9824 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9825 BEnd = ClassDecl->bases_end(); 9826 B != BEnd; ++B) { 9827 if (B->isVirtual()) // Handled below. 9828 continue; 9829 9830 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9831 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9832 CXXConstructorDecl *Constructor = 9833 LookupMovingConstructor(BaseClassDecl, 0); 9834 // If this is a deleted function, add it anyway. This might be conformant 9835 // with the standard. This might not. I'm not sure. It might not matter. 9836 if (Constructor) 9837 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9838 } 9839 } 9840 9841 // Virtual base-class constructors. 9842 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9843 BEnd = ClassDecl->vbases_end(); 9844 B != BEnd; ++B) { 9845 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9846 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9847 CXXConstructorDecl *Constructor = 9848 LookupMovingConstructor(BaseClassDecl, 0); 9849 // If this is a deleted function, add it anyway. This might be conformant 9850 // with the standard. This might not. I'm not sure. It might not matter. 9851 if (Constructor) 9852 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9853 } 9854 } 9855 9856 // Field constructors. 9857 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9858 FEnd = ClassDecl->field_end(); 9859 F != FEnd; ++F) { 9860 QualType FieldType = Context.getBaseElementType(F->getType()); 9861 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9862 CXXConstructorDecl *Constructor = 9863 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9864 // If this is a deleted function, add it anyway. This might be conformant 9865 // with the standard. This might not. I'm not sure. It might not matter. 9866 // In particular, the problem is that this function never gets called. It 9867 // might just be ill-formed because this function attempts to refer to 9868 // a deleted function here. 9869 if (Constructor) 9870 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9871 } 9872 } 9873 9874 return ExceptSpec; 9875} 9876 9877CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9878 CXXRecordDecl *ClassDecl) { 9879 // C++11 [class.copy]p9: 9880 // If the definition of a class X does not explicitly declare a move 9881 // constructor, one will be implicitly declared as defaulted if and only if: 9882 // 9883 // - [first 4 bullets] 9884 assert(ClassDecl->needsImplicitMoveConstructor()); 9885 9886 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9887 if (DSM.isAlreadyBeingDeclared()) 9888 return 0; 9889 9890 // [Checked after we build the declaration] 9891 // - the move assignment operator would not be implicitly defined as 9892 // deleted, 9893 9894 // [DR1402]: 9895 // - each of X's non-static data members and direct or virtual base classes 9896 // has a type that either has a move constructor or is trivially copyable. 9897 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9898 ClassDecl->setFailedImplicitMoveConstructor(); 9899 return 0; 9900 } 9901 9902 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9903 QualType ArgType = Context.getRValueReferenceType(ClassType); 9904 9905 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9906 CXXMoveConstructor, 9907 false); 9908 9909 DeclarationName Name 9910 = Context.DeclarationNames.getCXXConstructorName( 9911 Context.getCanonicalType(ClassType)); 9912 SourceLocation ClassLoc = ClassDecl->getLocation(); 9913 DeclarationNameInfo NameInfo(Name, ClassLoc); 9914 9915 // C++11 [class.copy]p11: 9916 // An implicitly-declared copy/move constructor is an inline public 9917 // member of its class. 9918 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9919 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9920 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9921 Constexpr); 9922 MoveConstructor->setAccess(AS_public); 9923 MoveConstructor->setDefaulted(); 9924 9925 // Build an exception specification pointing back at this member. 9926 FunctionProtoType::ExtProtoInfo EPI; 9927 EPI.ExceptionSpecType = EST_Unevaluated; 9928 EPI.ExceptionSpecDecl = MoveConstructor; 9929 MoveConstructor->setType( 9930 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9931 9932 // Add the parameter to the constructor. 9933 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9934 ClassLoc, ClassLoc, 9935 /*IdentifierInfo=*/0, 9936 ArgType, /*TInfo=*/0, 9937 SC_None, 0); 9938 MoveConstructor->setParams(FromParam); 9939 9940 MoveConstructor->setTrivial( 9941 ClassDecl->needsOverloadResolutionForMoveConstructor() 9942 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9943 : ClassDecl->hasTrivialMoveConstructor()); 9944 9945 // C++0x [class.copy]p9: 9946 // If the definition of a class X does not explicitly declare a move 9947 // constructor, one will be implicitly declared as defaulted if and only if: 9948 // [...] 9949 // - the move constructor would not be implicitly defined as deleted. 9950 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9951 // Cache this result so that we don't try to generate this over and over 9952 // on every lookup, leaking memory and wasting time. 9953 ClassDecl->setFailedImplicitMoveConstructor(); 9954 return 0; 9955 } 9956 9957 // Note that we have declared this constructor. 9958 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9959 9960 if (Scope *S = getScopeForContext(ClassDecl)) 9961 PushOnScopeChains(MoveConstructor, S, false); 9962 ClassDecl->addDecl(MoveConstructor); 9963 9964 return MoveConstructor; 9965} 9966 9967void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9968 CXXConstructorDecl *MoveConstructor) { 9969 assert((MoveConstructor->isDefaulted() && 9970 MoveConstructor->isMoveConstructor() && 9971 !MoveConstructor->doesThisDeclarationHaveABody() && 9972 !MoveConstructor->isDeleted()) && 9973 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9974 9975 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9976 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9977 9978 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9979 DiagnosticErrorTrap Trap(Diags); 9980 9981 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9982 Trap.hasErrorOccurred()) { 9983 Diag(CurrentLocation, diag::note_member_synthesized_at) 9984 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9985 MoveConstructor->setInvalidDecl(); 9986 } else { 9987 Sema::CompoundScopeRAII CompoundScope(*this); 9988 MoveConstructor->setBody(ActOnCompoundStmt( 9989 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None, 9990 /*isStmtExpr=*/ false).takeAs<Stmt>()); 9991 } 9992 9993 MoveConstructor->setUsed(); 9994 9995 if (ASTMutationListener *L = getASTMutationListener()) { 9996 L->CompletedImplicitDefinition(MoveConstructor); 9997 } 9998} 9999 10000bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 10001 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 10002} 10003 10004/// \brief Mark the call operator of the given lambda closure type as "used". 10005static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 10006 CXXMethodDecl *CallOperator 10007 = cast<CXXMethodDecl>( 10008 Lambda->lookup( 10009 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 10010 CallOperator->setReferenced(); 10011 CallOperator->setUsed(); 10012} 10013 10014void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10015 SourceLocation CurrentLocation, 10016 CXXConversionDecl *Conv) 10017{ 10018 CXXRecordDecl *Lambda = Conv->getParent(); 10019 10020 // Make sure that the lambda call operator is marked used. 10021 markLambdaCallOperatorUsed(*this, Lambda); 10022 10023 Conv->setUsed(); 10024 10025 SynthesizedFunctionScope Scope(*this, Conv); 10026 DiagnosticErrorTrap Trap(Diags); 10027 10028 // Return the address of the __invoke function. 10029 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 10030 CXXMethodDecl *Invoke 10031 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 10032 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 10033 VK_LValue, Conv->getLocation()).take(); 10034 assert(FunctionRef && "Can't refer to __invoke function?"); 10035 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10036 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10037 Conv->getLocation(), 10038 Conv->getLocation())); 10039 10040 // Fill in the __invoke function with a dummy implementation. IR generation 10041 // will fill in the actual details. 10042 Invoke->setUsed(); 10043 Invoke->setReferenced(); 10044 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10045 10046 if (ASTMutationListener *L = getASTMutationListener()) { 10047 L->CompletedImplicitDefinition(Conv); 10048 L->CompletedImplicitDefinition(Invoke); 10049 } 10050} 10051 10052void Sema::DefineImplicitLambdaToBlockPointerConversion( 10053 SourceLocation CurrentLocation, 10054 CXXConversionDecl *Conv) 10055{ 10056 Conv->setUsed(); 10057 10058 SynthesizedFunctionScope Scope(*this, Conv); 10059 DiagnosticErrorTrap Trap(Diags); 10060 10061 // Copy-initialize the lambda object as needed to capture it. 10062 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10063 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10064 10065 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10066 Conv->getLocation(), 10067 Conv, DerefThis); 10068 10069 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10070 // behavior. Note that only the general conversion function does this 10071 // (since it's unusable otherwise); in the case where we inline the 10072 // block literal, it has block literal lifetime semantics. 10073 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10074 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10075 CK_CopyAndAutoreleaseBlockObject, 10076 BuildBlock.get(), 0, VK_RValue); 10077 10078 if (BuildBlock.isInvalid()) { 10079 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10080 Conv->setInvalidDecl(); 10081 return; 10082 } 10083 10084 // Create the return statement that returns the block from the conversion 10085 // function. 10086 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10087 if (Return.isInvalid()) { 10088 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10089 Conv->setInvalidDecl(); 10090 return; 10091 } 10092 10093 // Set the body of the conversion function. 10094 Stmt *ReturnS = Return.take(); 10095 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10096 Conv->getLocation(), 10097 Conv->getLocation())); 10098 10099 // We're done; notify the mutation listener, if any. 10100 if (ASTMutationListener *L = getASTMutationListener()) { 10101 L->CompletedImplicitDefinition(Conv); 10102 } 10103} 10104 10105/// \brief Determine whether the given list arguments contains exactly one 10106/// "real" (non-default) argument. 10107static bool hasOneRealArgument(MultiExprArg Args) { 10108 switch (Args.size()) { 10109 case 0: 10110 return false; 10111 10112 default: 10113 if (!Args[1]->isDefaultArgument()) 10114 return false; 10115 10116 // fall through 10117 case 1: 10118 return !Args[0]->isDefaultArgument(); 10119 } 10120 10121 return false; 10122} 10123 10124ExprResult 10125Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10126 CXXConstructorDecl *Constructor, 10127 MultiExprArg ExprArgs, 10128 bool HadMultipleCandidates, 10129 bool IsListInitialization, 10130 bool RequiresZeroInit, 10131 unsigned ConstructKind, 10132 SourceRange ParenRange) { 10133 bool Elidable = false; 10134 10135 // C++0x [class.copy]p34: 10136 // When certain criteria are met, an implementation is allowed to 10137 // omit the copy/move construction of a class object, even if the 10138 // copy/move constructor and/or destructor for the object have 10139 // side effects. [...] 10140 // - when a temporary class object that has not been bound to a 10141 // reference (12.2) would be copied/moved to a class object 10142 // with the same cv-unqualified type, the copy/move operation 10143 // can be omitted by constructing the temporary object 10144 // directly into the target of the omitted copy/move 10145 if (ConstructKind == CXXConstructExpr::CK_Complete && 10146 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10147 Expr *SubExpr = ExprArgs[0]; 10148 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10149 } 10150 10151 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10152 Elidable, ExprArgs, HadMultipleCandidates, 10153 IsListInitialization, RequiresZeroInit, 10154 ConstructKind, ParenRange); 10155} 10156 10157/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10158/// including handling of its default argument expressions. 10159ExprResult 10160Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10161 CXXConstructorDecl *Constructor, bool Elidable, 10162 MultiExprArg ExprArgs, 10163 bool HadMultipleCandidates, 10164 bool IsListInitialization, 10165 bool RequiresZeroInit, 10166 unsigned ConstructKind, 10167 SourceRange ParenRange) { 10168 MarkFunctionReferenced(ConstructLoc, Constructor); 10169 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10170 Constructor, Elidable, ExprArgs, 10171 HadMultipleCandidates, 10172 IsListInitialization, RequiresZeroInit, 10173 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10174 ParenRange)); 10175} 10176 10177void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10178 if (VD->isInvalidDecl()) return; 10179 10180 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10181 if (ClassDecl->isInvalidDecl()) return; 10182 if (ClassDecl->hasIrrelevantDestructor()) return; 10183 if (ClassDecl->isDependentContext()) return; 10184 10185 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10186 MarkFunctionReferenced(VD->getLocation(), Destructor); 10187 CheckDestructorAccess(VD->getLocation(), Destructor, 10188 PDiag(diag::err_access_dtor_var) 10189 << VD->getDeclName() 10190 << VD->getType()); 10191 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10192 10193 if (!VD->hasGlobalStorage()) return; 10194 10195 // Emit warning for non-trivial dtor in global scope (a real global, 10196 // class-static, function-static). 10197 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10198 10199 // TODO: this should be re-enabled for static locals by !CXAAtExit 10200 if (!VD->isStaticLocal()) 10201 Diag(VD->getLocation(), diag::warn_global_destructor); 10202} 10203 10204/// \brief Given a constructor and the set of arguments provided for the 10205/// constructor, convert the arguments and add any required default arguments 10206/// to form a proper call to this constructor. 10207/// 10208/// \returns true if an error occurred, false otherwise. 10209bool 10210Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10211 MultiExprArg ArgsPtr, 10212 SourceLocation Loc, 10213 SmallVectorImpl<Expr*> &ConvertedArgs, 10214 bool AllowExplicit, 10215 bool IsListInitialization) { 10216 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10217 unsigned NumArgs = ArgsPtr.size(); 10218 Expr **Args = ArgsPtr.data(); 10219 10220 const FunctionProtoType *Proto 10221 = Constructor->getType()->getAs<FunctionProtoType>(); 10222 assert(Proto && "Constructor without a prototype?"); 10223 unsigned NumArgsInProto = Proto->getNumArgs(); 10224 10225 // If too few arguments are available, we'll fill in the rest with defaults. 10226 if (NumArgs < NumArgsInProto) 10227 ConvertedArgs.reserve(NumArgsInProto); 10228 else 10229 ConvertedArgs.reserve(NumArgs); 10230 10231 VariadicCallType CallType = 10232 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10233 SmallVector<Expr *, 8> AllArgs; 10234 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10235 Proto, 0, 10236 llvm::makeArrayRef(Args, NumArgs), 10237 AllArgs, 10238 CallType, AllowExplicit, 10239 IsListInitialization); 10240 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10241 10242 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10243 10244 CheckConstructorCall(Constructor, 10245 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10246 AllArgs.size()), 10247 Proto, Loc); 10248 10249 return Invalid; 10250} 10251 10252static inline bool 10253CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10254 const FunctionDecl *FnDecl) { 10255 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10256 if (isa<NamespaceDecl>(DC)) { 10257 return SemaRef.Diag(FnDecl->getLocation(), 10258 diag::err_operator_new_delete_declared_in_namespace) 10259 << FnDecl->getDeclName(); 10260 } 10261 10262 if (isa<TranslationUnitDecl>(DC) && 10263 FnDecl->getStorageClass() == SC_Static) { 10264 return SemaRef.Diag(FnDecl->getLocation(), 10265 diag::err_operator_new_delete_declared_static) 10266 << FnDecl->getDeclName(); 10267 } 10268 10269 return false; 10270} 10271 10272static inline bool 10273CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10274 CanQualType ExpectedResultType, 10275 CanQualType ExpectedFirstParamType, 10276 unsigned DependentParamTypeDiag, 10277 unsigned InvalidParamTypeDiag) { 10278 QualType ResultType = 10279 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10280 10281 // Check that the result type is not dependent. 10282 if (ResultType->isDependentType()) 10283 return SemaRef.Diag(FnDecl->getLocation(), 10284 diag::err_operator_new_delete_dependent_result_type) 10285 << FnDecl->getDeclName() << ExpectedResultType; 10286 10287 // Check that the result type is what we expect. 10288 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10289 return SemaRef.Diag(FnDecl->getLocation(), 10290 diag::err_operator_new_delete_invalid_result_type) 10291 << FnDecl->getDeclName() << ExpectedResultType; 10292 10293 // A function template must have at least 2 parameters. 10294 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10295 return SemaRef.Diag(FnDecl->getLocation(), 10296 diag::err_operator_new_delete_template_too_few_parameters) 10297 << FnDecl->getDeclName(); 10298 10299 // The function decl must have at least 1 parameter. 10300 if (FnDecl->getNumParams() == 0) 10301 return SemaRef.Diag(FnDecl->getLocation(), 10302 diag::err_operator_new_delete_too_few_parameters) 10303 << FnDecl->getDeclName(); 10304 10305 // Check the first parameter type is not dependent. 10306 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10307 if (FirstParamType->isDependentType()) 10308 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10309 << FnDecl->getDeclName() << ExpectedFirstParamType; 10310 10311 // Check that the first parameter type is what we expect. 10312 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10313 ExpectedFirstParamType) 10314 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10315 << FnDecl->getDeclName() << ExpectedFirstParamType; 10316 10317 return false; 10318} 10319 10320static bool 10321CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10322 // C++ [basic.stc.dynamic.allocation]p1: 10323 // A program is ill-formed if an allocation function is declared in a 10324 // namespace scope other than global scope or declared static in global 10325 // scope. 10326 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10327 return true; 10328 10329 CanQualType SizeTy = 10330 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10331 10332 // C++ [basic.stc.dynamic.allocation]p1: 10333 // The return type shall be void*. The first parameter shall have type 10334 // std::size_t. 10335 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10336 SizeTy, 10337 diag::err_operator_new_dependent_param_type, 10338 diag::err_operator_new_param_type)) 10339 return true; 10340 10341 // C++ [basic.stc.dynamic.allocation]p1: 10342 // The first parameter shall not have an associated default argument. 10343 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10344 return SemaRef.Diag(FnDecl->getLocation(), 10345 diag::err_operator_new_default_arg) 10346 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10347 10348 return false; 10349} 10350 10351static bool 10352CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10353 // C++ [basic.stc.dynamic.deallocation]p1: 10354 // A program is ill-formed if deallocation functions are declared in a 10355 // namespace scope other than global scope or declared static in global 10356 // scope. 10357 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10358 return true; 10359 10360 // C++ [basic.stc.dynamic.deallocation]p2: 10361 // Each deallocation function shall return void and its first parameter 10362 // shall be void*. 10363 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10364 SemaRef.Context.VoidPtrTy, 10365 diag::err_operator_delete_dependent_param_type, 10366 diag::err_operator_delete_param_type)) 10367 return true; 10368 10369 return false; 10370} 10371 10372/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10373/// of this overloaded operator is well-formed. If so, returns false; 10374/// otherwise, emits appropriate diagnostics and returns true. 10375bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10376 assert(FnDecl && FnDecl->isOverloadedOperator() && 10377 "Expected an overloaded operator declaration"); 10378 10379 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10380 10381 // C++ [over.oper]p5: 10382 // The allocation and deallocation functions, operator new, 10383 // operator new[], operator delete and operator delete[], are 10384 // described completely in 3.7.3. The attributes and restrictions 10385 // found in the rest of this subclause do not apply to them unless 10386 // explicitly stated in 3.7.3. 10387 if (Op == OO_Delete || Op == OO_Array_Delete) 10388 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10389 10390 if (Op == OO_New || Op == OO_Array_New) 10391 return CheckOperatorNewDeclaration(*this, FnDecl); 10392 10393 // C++ [over.oper]p6: 10394 // An operator function shall either be a non-static member 10395 // function or be a non-member function and have at least one 10396 // parameter whose type is a class, a reference to a class, an 10397 // enumeration, or a reference to an enumeration. 10398 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10399 if (MethodDecl->isStatic()) 10400 return Diag(FnDecl->getLocation(), 10401 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10402 } else { 10403 bool ClassOrEnumParam = false; 10404 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10405 ParamEnd = FnDecl->param_end(); 10406 Param != ParamEnd; ++Param) { 10407 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10408 if (ParamType->isDependentType() || ParamType->isRecordType() || 10409 ParamType->isEnumeralType()) { 10410 ClassOrEnumParam = true; 10411 break; 10412 } 10413 } 10414 10415 if (!ClassOrEnumParam) 10416 return Diag(FnDecl->getLocation(), 10417 diag::err_operator_overload_needs_class_or_enum) 10418 << FnDecl->getDeclName(); 10419 } 10420 10421 // C++ [over.oper]p8: 10422 // An operator function cannot have default arguments (8.3.6), 10423 // except where explicitly stated below. 10424 // 10425 // Only the function-call operator allows default arguments 10426 // (C++ [over.call]p1). 10427 if (Op != OO_Call) { 10428 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10429 Param != FnDecl->param_end(); ++Param) { 10430 if ((*Param)->hasDefaultArg()) 10431 return Diag((*Param)->getLocation(), 10432 diag::err_operator_overload_default_arg) 10433 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10434 } 10435 } 10436 10437 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10438 { false, false, false } 10439#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10440 , { Unary, Binary, MemberOnly } 10441#include "clang/Basic/OperatorKinds.def" 10442 }; 10443 10444 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10445 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10446 bool MustBeMemberOperator = OperatorUses[Op][2]; 10447 10448 // C++ [over.oper]p8: 10449 // [...] Operator functions cannot have more or fewer parameters 10450 // than the number required for the corresponding operator, as 10451 // described in the rest of this subclause. 10452 unsigned NumParams = FnDecl->getNumParams() 10453 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10454 if (Op != OO_Call && 10455 ((NumParams == 1 && !CanBeUnaryOperator) || 10456 (NumParams == 2 && !CanBeBinaryOperator) || 10457 (NumParams < 1) || (NumParams > 2))) { 10458 // We have the wrong number of parameters. 10459 unsigned ErrorKind; 10460 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10461 ErrorKind = 2; // 2 -> unary or binary. 10462 } else if (CanBeUnaryOperator) { 10463 ErrorKind = 0; // 0 -> unary 10464 } else { 10465 assert(CanBeBinaryOperator && 10466 "All non-call overloaded operators are unary or binary!"); 10467 ErrorKind = 1; // 1 -> binary 10468 } 10469 10470 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10471 << FnDecl->getDeclName() << NumParams << ErrorKind; 10472 } 10473 10474 // Overloaded operators other than operator() cannot be variadic. 10475 if (Op != OO_Call && 10476 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10477 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10478 << FnDecl->getDeclName(); 10479 } 10480 10481 // Some operators must be non-static member functions. 10482 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10483 return Diag(FnDecl->getLocation(), 10484 diag::err_operator_overload_must_be_member) 10485 << FnDecl->getDeclName(); 10486 } 10487 10488 // C++ [over.inc]p1: 10489 // The user-defined function called operator++ implements the 10490 // prefix and postfix ++ operator. If this function is a member 10491 // function with no parameters, or a non-member function with one 10492 // parameter of class or enumeration type, it defines the prefix 10493 // increment operator ++ for objects of that type. If the function 10494 // is a member function with one parameter (which shall be of type 10495 // int) or a non-member function with two parameters (the second 10496 // of which shall be of type int), it defines the postfix 10497 // increment operator ++ for objects of that type. 10498 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10499 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10500 bool ParamIsInt = false; 10501 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10502 ParamIsInt = BT->getKind() == BuiltinType::Int; 10503 10504 if (!ParamIsInt) 10505 return Diag(LastParam->getLocation(), 10506 diag::err_operator_overload_post_incdec_must_be_int) 10507 << LastParam->getType() << (Op == OO_MinusMinus); 10508 } 10509 10510 return false; 10511} 10512 10513/// CheckLiteralOperatorDeclaration - Check whether the declaration 10514/// of this literal operator function is well-formed. If so, returns 10515/// false; otherwise, emits appropriate diagnostics and returns true. 10516bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10517 if (isa<CXXMethodDecl>(FnDecl)) { 10518 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10519 << FnDecl->getDeclName(); 10520 return true; 10521 } 10522 10523 if (FnDecl->isExternC()) { 10524 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10525 return true; 10526 } 10527 10528 bool Valid = false; 10529 10530 // This might be the definition of a literal operator template. 10531 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10532 // This might be a specialization of a literal operator template. 10533 if (!TpDecl) 10534 TpDecl = FnDecl->getPrimaryTemplate(); 10535 10536 // template <char...> type operator "" name() is the only valid template 10537 // signature, and the only valid signature with no parameters. 10538 if (TpDecl) { 10539 if (FnDecl->param_size() == 0) { 10540 // Must have only one template parameter 10541 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10542 if (Params->size() == 1) { 10543 NonTypeTemplateParmDecl *PmDecl = 10544 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10545 10546 // The template parameter must be a char parameter pack. 10547 if (PmDecl && PmDecl->isTemplateParameterPack() && 10548 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10549 Valid = true; 10550 } 10551 } 10552 } else if (FnDecl->param_size()) { 10553 // Check the first parameter 10554 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10555 10556 QualType T = (*Param)->getType().getUnqualifiedType(); 10557 10558 // unsigned long long int, long double, and any character type are allowed 10559 // as the only parameters. 10560 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10561 Context.hasSameType(T, Context.LongDoubleTy) || 10562 Context.hasSameType(T, Context.CharTy) || 10563 Context.hasSameType(T, Context.WideCharTy) || 10564 Context.hasSameType(T, Context.Char16Ty) || 10565 Context.hasSameType(T, Context.Char32Ty)) { 10566 if (++Param == FnDecl->param_end()) 10567 Valid = true; 10568 goto FinishedParams; 10569 } 10570 10571 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10572 const PointerType *PT = T->getAs<PointerType>(); 10573 if (!PT) 10574 goto FinishedParams; 10575 T = PT->getPointeeType(); 10576 if (!T.isConstQualified() || T.isVolatileQualified()) 10577 goto FinishedParams; 10578 T = T.getUnqualifiedType(); 10579 10580 // Move on to the second parameter; 10581 ++Param; 10582 10583 // If there is no second parameter, the first must be a const char * 10584 if (Param == FnDecl->param_end()) { 10585 if (Context.hasSameType(T, Context.CharTy)) 10586 Valid = true; 10587 goto FinishedParams; 10588 } 10589 10590 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10591 // are allowed as the first parameter to a two-parameter function 10592 if (!(Context.hasSameType(T, Context.CharTy) || 10593 Context.hasSameType(T, Context.WideCharTy) || 10594 Context.hasSameType(T, Context.Char16Ty) || 10595 Context.hasSameType(T, Context.Char32Ty))) 10596 goto FinishedParams; 10597 10598 // The second and final parameter must be an std::size_t 10599 T = (*Param)->getType().getUnqualifiedType(); 10600 if (Context.hasSameType(T, Context.getSizeType()) && 10601 ++Param == FnDecl->param_end()) 10602 Valid = true; 10603 } 10604 10605 // FIXME: This diagnostic is absolutely terrible. 10606FinishedParams: 10607 if (!Valid) { 10608 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10609 << FnDecl->getDeclName(); 10610 return true; 10611 } 10612 10613 // A parameter-declaration-clause containing a default argument is not 10614 // equivalent to any of the permitted forms. 10615 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10616 ParamEnd = FnDecl->param_end(); 10617 Param != ParamEnd; ++Param) { 10618 if ((*Param)->hasDefaultArg()) { 10619 Diag((*Param)->getDefaultArgRange().getBegin(), 10620 diag::err_literal_operator_default_argument) 10621 << (*Param)->getDefaultArgRange(); 10622 break; 10623 } 10624 } 10625 10626 StringRef LiteralName 10627 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10628 if (LiteralName[0] != '_') { 10629 // C++11 [usrlit.suffix]p1: 10630 // Literal suffix identifiers that do not start with an underscore 10631 // are reserved for future standardization. 10632 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) 10633 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); 10634 } 10635 10636 return false; 10637} 10638 10639/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10640/// linkage specification, including the language and (if present) 10641/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10642/// the location of the language string literal, which is provided 10643/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10644/// the '{' brace. Otherwise, this linkage specification does not 10645/// have any braces. 10646Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10647 SourceLocation LangLoc, 10648 StringRef Lang, 10649 SourceLocation LBraceLoc) { 10650 LinkageSpecDecl::LanguageIDs Language; 10651 if (Lang == "\"C\"") 10652 Language = LinkageSpecDecl::lang_c; 10653 else if (Lang == "\"C++\"") 10654 Language = LinkageSpecDecl::lang_cxx; 10655 else { 10656 Diag(LangLoc, diag::err_bad_language); 10657 return 0; 10658 } 10659 10660 // FIXME: Add all the various semantics of linkage specifications 10661 10662 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10663 ExternLoc, LangLoc, Language, 10664 LBraceLoc.isValid()); 10665 CurContext->addDecl(D); 10666 PushDeclContext(S, D); 10667 return D; 10668} 10669 10670/// ActOnFinishLinkageSpecification - Complete the definition of 10671/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10672/// valid, it's the position of the closing '}' brace in a linkage 10673/// specification that uses braces. 10674Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10675 Decl *LinkageSpec, 10676 SourceLocation RBraceLoc) { 10677 if (LinkageSpec) { 10678 if (RBraceLoc.isValid()) { 10679 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10680 LSDecl->setRBraceLoc(RBraceLoc); 10681 } 10682 PopDeclContext(); 10683 } 10684 return LinkageSpec; 10685} 10686 10687Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10688 AttributeList *AttrList, 10689 SourceLocation SemiLoc) { 10690 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10691 // Attribute declarations appertain to empty declaration so we handle 10692 // them here. 10693 if (AttrList) 10694 ProcessDeclAttributeList(S, ED, AttrList); 10695 10696 CurContext->addDecl(ED); 10697 return ED; 10698} 10699 10700/// \brief Perform semantic analysis for the variable declaration that 10701/// occurs within a C++ catch clause, returning the newly-created 10702/// variable. 10703VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10704 TypeSourceInfo *TInfo, 10705 SourceLocation StartLoc, 10706 SourceLocation Loc, 10707 IdentifierInfo *Name) { 10708 bool Invalid = false; 10709 QualType ExDeclType = TInfo->getType(); 10710 10711 // Arrays and functions decay. 10712 if (ExDeclType->isArrayType()) 10713 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10714 else if (ExDeclType->isFunctionType()) 10715 ExDeclType = Context.getPointerType(ExDeclType); 10716 10717 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10718 // The exception-declaration shall not denote a pointer or reference to an 10719 // incomplete type, other than [cv] void*. 10720 // N2844 forbids rvalue references. 10721 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10722 Diag(Loc, diag::err_catch_rvalue_ref); 10723 Invalid = true; 10724 } 10725 10726 QualType BaseType = ExDeclType; 10727 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10728 unsigned DK = diag::err_catch_incomplete; 10729 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10730 BaseType = Ptr->getPointeeType(); 10731 Mode = 1; 10732 DK = diag::err_catch_incomplete_ptr; 10733 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10734 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10735 BaseType = Ref->getPointeeType(); 10736 Mode = 2; 10737 DK = diag::err_catch_incomplete_ref; 10738 } 10739 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10740 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10741 Invalid = true; 10742 10743 if (!Invalid && !ExDeclType->isDependentType() && 10744 RequireNonAbstractType(Loc, ExDeclType, 10745 diag::err_abstract_type_in_decl, 10746 AbstractVariableType)) 10747 Invalid = true; 10748 10749 // Only the non-fragile NeXT runtime currently supports C++ catches 10750 // of ObjC types, and no runtime supports catching ObjC types by value. 10751 if (!Invalid && getLangOpts().ObjC1) { 10752 QualType T = ExDeclType; 10753 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10754 T = RT->getPointeeType(); 10755 10756 if (T->isObjCObjectType()) { 10757 Diag(Loc, diag::err_objc_object_catch); 10758 Invalid = true; 10759 } else if (T->isObjCObjectPointerType()) { 10760 // FIXME: should this be a test for macosx-fragile specifically? 10761 if (getLangOpts().ObjCRuntime.isFragile()) 10762 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10763 } 10764 } 10765 10766 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10767 ExDeclType, TInfo, SC_None); 10768 ExDecl->setExceptionVariable(true); 10769 10770 // In ARC, infer 'retaining' for variables of retainable type. 10771 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10772 Invalid = true; 10773 10774 if (!Invalid && !ExDeclType->isDependentType()) { 10775 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10776 // Insulate this from anything else we might currently be parsing. 10777 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10778 10779 // C++ [except.handle]p16: 10780 // The object declared in an exception-declaration or, if the 10781 // exception-declaration does not specify a name, a temporary (12.2) is 10782 // copy-initialized (8.5) from the exception object. [...] 10783 // The object is destroyed when the handler exits, after the destruction 10784 // of any automatic objects initialized within the handler. 10785 // 10786 // We just pretend to initialize the object with itself, then make sure 10787 // it can be destroyed later. 10788 QualType initType = ExDeclType; 10789 10790 InitializedEntity entity = 10791 InitializedEntity::InitializeVariable(ExDecl); 10792 InitializationKind initKind = 10793 InitializationKind::CreateCopy(Loc, SourceLocation()); 10794 10795 Expr *opaqueValue = 10796 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10797 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 10798 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 10799 if (result.isInvalid()) 10800 Invalid = true; 10801 else { 10802 // If the constructor used was non-trivial, set this as the 10803 // "initializer". 10804 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10805 if (!construct->getConstructor()->isTrivial()) { 10806 Expr *init = MaybeCreateExprWithCleanups(construct); 10807 ExDecl->setInit(init); 10808 } 10809 10810 // And make sure it's destructable. 10811 FinalizeVarWithDestructor(ExDecl, recordType); 10812 } 10813 } 10814 } 10815 10816 if (Invalid) 10817 ExDecl->setInvalidDecl(); 10818 10819 return ExDecl; 10820} 10821 10822/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10823/// handler. 10824Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10825 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10826 bool Invalid = D.isInvalidType(); 10827 10828 // Check for unexpanded parameter packs. 10829 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10830 UPPC_ExceptionType)) { 10831 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10832 D.getIdentifierLoc()); 10833 Invalid = true; 10834 } 10835 10836 IdentifierInfo *II = D.getIdentifier(); 10837 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10838 LookupOrdinaryName, 10839 ForRedeclaration)) { 10840 // The scope should be freshly made just for us. There is just no way 10841 // it contains any previous declaration. 10842 assert(!S->isDeclScope(PrevDecl)); 10843 if (PrevDecl->isTemplateParameter()) { 10844 // Maybe we will complain about the shadowed template parameter. 10845 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10846 PrevDecl = 0; 10847 } 10848 } 10849 10850 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10851 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10852 << D.getCXXScopeSpec().getRange(); 10853 Invalid = true; 10854 } 10855 10856 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10857 D.getLocStart(), 10858 D.getIdentifierLoc(), 10859 D.getIdentifier()); 10860 if (Invalid) 10861 ExDecl->setInvalidDecl(); 10862 10863 // Add the exception declaration into this scope. 10864 if (II) 10865 PushOnScopeChains(ExDecl, S); 10866 else 10867 CurContext->addDecl(ExDecl); 10868 10869 ProcessDeclAttributes(S, ExDecl, D); 10870 return ExDecl; 10871} 10872 10873Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10874 Expr *AssertExpr, 10875 Expr *AssertMessageExpr, 10876 SourceLocation RParenLoc) { 10877 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10878 10879 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10880 return 0; 10881 10882 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10883 AssertMessage, RParenLoc, false); 10884} 10885 10886Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10887 Expr *AssertExpr, 10888 StringLiteral *AssertMessage, 10889 SourceLocation RParenLoc, 10890 bool Failed) { 10891 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10892 !Failed) { 10893 // In a static_assert-declaration, the constant-expression shall be a 10894 // constant expression that can be contextually converted to bool. 10895 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10896 if (Converted.isInvalid()) 10897 Failed = true; 10898 10899 llvm::APSInt Cond; 10900 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10901 diag::err_static_assert_expression_is_not_constant, 10902 /*AllowFold=*/false).isInvalid()) 10903 Failed = true; 10904 10905 if (!Failed && !Cond) { 10906 SmallString<256> MsgBuffer; 10907 llvm::raw_svector_ostream Msg(MsgBuffer); 10908 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10909 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10910 << Msg.str() << AssertExpr->getSourceRange(); 10911 Failed = true; 10912 } 10913 } 10914 10915 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10916 AssertExpr, AssertMessage, RParenLoc, 10917 Failed); 10918 10919 CurContext->addDecl(Decl); 10920 return Decl; 10921} 10922 10923/// \brief Perform semantic analysis of the given friend type declaration. 10924/// 10925/// \returns A friend declaration that. 10926FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10927 SourceLocation FriendLoc, 10928 TypeSourceInfo *TSInfo) { 10929 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10930 10931 QualType T = TSInfo->getType(); 10932 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10933 10934 // C++03 [class.friend]p2: 10935 // An elaborated-type-specifier shall be used in a friend declaration 10936 // for a class.* 10937 // 10938 // * The class-key of the elaborated-type-specifier is required. 10939 if (!ActiveTemplateInstantiations.empty()) { 10940 // Do not complain about the form of friend template types during 10941 // template instantiation; we will already have complained when the 10942 // template was declared. 10943 } else { 10944 if (!T->isElaboratedTypeSpecifier()) { 10945 // If we evaluated the type to a record type, suggest putting 10946 // a tag in front. 10947 if (const RecordType *RT = T->getAs<RecordType>()) { 10948 RecordDecl *RD = RT->getDecl(); 10949 10950 std::string InsertionText = std::string(" ") + RD->getKindName(); 10951 10952 Diag(TypeRange.getBegin(), 10953 getLangOpts().CPlusPlus11 ? 10954 diag::warn_cxx98_compat_unelaborated_friend_type : 10955 diag::ext_unelaborated_friend_type) 10956 << (unsigned) RD->getTagKind() 10957 << T 10958 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10959 InsertionText); 10960 } else { 10961 Diag(FriendLoc, 10962 getLangOpts().CPlusPlus11 ? 10963 diag::warn_cxx98_compat_nonclass_type_friend : 10964 diag::ext_nonclass_type_friend) 10965 << T 10966 << TypeRange; 10967 } 10968 } else if (T->getAs<EnumType>()) { 10969 Diag(FriendLoc, 10970 getLangOpts().CPlusPlus11 ? 10971 diag::warn_cxx98_compat_enum_friend : 10972 diag::ext_enum_friend) 10973 << T 10974 << TypeRange; 10975 } 10976 10977 // C++11 [class.friend]p3: 10978 // A friend declaration that does not declare a function shall have one 10979 // of the following forms: 10980 // friend elaborated-type-specifier ; 10981 // friend simple-type-specifier ; 10982 // friend typename-specifier ; 10983 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10984 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10985 } 10986 10987 // If the type specifier in a friend declaration designates a (possibly 10988 // cv-qualified) class type, that class is declared as a friend; otherwise, 10989 // the friend declaration is ignored. 10990 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10991} 10992 10993/// Handle a friend tag declaration where the scope specifier was 10994/// templated. 10995Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10996 unsigned TagSpec, SourceLocation TagLoc, 10997 CXXScopeSpec &SS, 10998 IdentifierInfo *Name, 10999 SourceLocation NameLoc, 11000 AttributeList *Attr, 11001 MultiTemplateParamsArg TempParamLists) { 11002 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 11003 11004 bool isExplicitSpecialization = false; 11005 bool Invalid = false; 11006 11007 if (TemplateParameterList *TemplateParams = 11008 MatchTemplateParametersToScopeSpecifier( 11009 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true, 11010 isExplicitSpecialization, Invalid)) { 11011 if (TemplateParams->size() > 0) { 11012 // This is a declaration of a class template. 11013 if (Invalid) 11014 return 0; 11015 11016 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11017 SS, Name, NameLoc, Attr, 11018 TemplateParams, AS_public, 11019 /*ModulePrivateLoc=*/SourceLocation(), 11020 TempParamLists.size() - 1, 11021 TempParamLists.data()).take(); 11022 } else { 11023 // The "template<>" header is extraneous. 11024 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11025 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11026 isExplicitSpecialization = true; 11027 } 11028 } 11029 11030 if (Invalid) return 0; 11031 11032 bool isAllExplicitSpecializations = true; 11033 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11034 if (TempParamLists[I]->size()) { 11035 isAllExplicitSpecializations = false; 11036 break; 11037 } 11038 } 11039 11040 // FIXME: don't ignore attributes. 11041 11042 // If it's explicit specializations all the way down, just forget 11043 // about the template header and build an appropriate non-templated 11044 // friend. TODO: for source fidelity, remember the headers. 11045 if (isAllExplicitSpecializations) { 11046 if (SS.isEmpty()) { 11047 bool Owned = false; 11048 bool IsDependent = false; 11049 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11050 Attr, AS_public, 11051 /*ModulePrivateLoc=*/SourceLocation(), 11052 MultiTemplateParamsArg(), Owned, IsDependent, 11053 /*ScopedEnumKWLoc=*/SourceLocation(), 11054 /*ScopedEnumUsesClassTag=*/false, 11055 /*UnderlyingType=*/TypeResult()); 11056 } 11057 11058 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11059 ElaboratedTypeKeyword Keyword 11060 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11061 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11062 *Name, NameLoc); 11063 if (T.isNull()) 11064 return 0; 11065 11066 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11067 if (isa<DependentNameType>(T)) { 11068 DependentNameTypeLoc TL = 11069 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11070 TL.setElaboratedKeywordLoc(TagLoc); 11071 TL.setQualifierLoc(QualifierLoc); 11072 TL.setNameLoc(NameLoc); 11073 } else { 11074 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11075 TL.setElaboratedKeywordLoc(TagLoc); 11076 TL.setQualifierLoc(QualifierLoc); 11077 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11078 } 11079 11080 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11081 TSI, FriendLoc, TempParamLists); 11082 Friend->setAccess(AS_public); 11083 CurContext->addDecl(Friend); 11084 return Friend; 11085 } 11086 11087 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11088 11089 11090 11091 // Handle the case of a templated-scope friend class. e.g. 11092 // template <class T> class A<T>::B; 11093 // FIXME: we don't support these right now. 11094 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11095 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11096 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11097 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11098 TL.setElaboratedKeywordLoc(TagLoc); 11099 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11100 TL.setNameLoc(NameLoc); 11101 11102 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11103 TSI, FriendLoc, TempParamLists); 11104 Friend->setAccess(AS_public); 11105 Friend->setUnsupportedFriend(true); 11106 CurContext->addDecl(Friend); 11107 return Friend; 11108} 11109 11110 11111/// Handle a friend type declaration. This works in tandem with 11112/// ActOnTag. 11113/// 11114/// Notes on friend class templates: 11115/// 11116/// We generally treat friend class declarations as if they were 11117/// declaring a class. So, for example, the elaborated type specifier 11118/// in a friend declaration is required to obey the restrictions of a 11119/// class-head (i.e. no typedefs in the scope chain), template 11120/// parameters are required to match up with simple template-ids, &c. 11121/// However, unlike when declaring a template specialization, it's 11122/// okay to refer to a template specialization without an empty 11123/// template parameter declaration, e.g. 11124/// friend class A<T>::B<unsigned>; 11125/// We permit this as a special case; if there are any template 11126/// parameters present at all, require proper matching, i.e. 11127/// template <> template \<class T> friend class A<int>::B; 11128Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11129 MultiTemplateParamsArg TempParams) { 11130 SourceLocation Loc = DS.getLocStart(); 11131 11132 assert(DS.isFriendSpecified()); 11133 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11134 11135 // Try to convert the decl specifier to a type. This works for 11136 // friend templates because ActOnTag never produces a ClassTemplateDecl 11137 // for a TUK_Friend. 11138 Declarator TheDeclarator(DS, Declarator::MemberContext); 11139 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11140 QualType T = TSI->getType(); 11141 if (TheDeclarator.isInvalidType()) 11142 return 0; 11143 11144 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11145 return 0; 11146 11147 // This is definitely an error in C++98. It's probably meant to 11148 // be forbidden in C++0x, too, but the specification is just 11149 // poorly written. 11150 // 11151 // The problem is with declarations like the following: 11152 // template <T> friend A<T>::foo; 11153 // where deciding whether a class C is a friend or not now hinges 11154 // on whether there exists an instantiation of A that causes 11155 // 'foo' to equal C. There are restrictions on class-heads 11156 // (which we declare (by fiat) elaborated friend declarations to 11157 // be) that makes this tractable. 11158 // 11159 // FIXME: handle "template <> friend class A<T>;", which 11160 // is possibly well-formed? Who even knows? 11161 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11162 Diag(Loc, diag::err_tagless_friend_type_template) 11163 << DS.getSourceRange(); 11164 return 0; 11165 } 11166 11167 // C++98 [class.friend]p1: A friend of a class is a function 11168 // or class that is not a member of the class . . . 11169 // This is fixed in DR77, which just barely didn't make the C++03 11170 // deadline. It's also a very silly restriction that seriously 11171 // affects inner classes and which nobody else seems to implement; 11172 // thus we never diagnose it, not even in -pedantic. 11173 // 11174 // But note that we could warn about it: it's always useless to 11175 // friend one of your own members (it's not, however, worthless to 11176 // friend a member of an arbitrary specialization of your template). 11177 11178 Decl *D; 11179 if (unsigned NumTempParamLists = TempParams.size()) 11180 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11181 NumTempParamLists, 11182 TempParams.data(), 11183 TSI, 11184 DS.getFriendSpecLoc()); 11185 else 11186 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11187 11188 if (!D) 11189 return 0; 11190 11191 D->setAccess(AS_public); 11192 CurContext->addDecl(D); 11193 11194 return D; 11195} 11196 11197NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11198 MultiTemplateParamsArg TemplateParams) { 11199 const DeclSpec &DS = D.getDeclSpec(); 11200 11201 assert(DS.isFriendSpecified()); 11202 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11203 11204 SourceLocation Loc = D.getIdentifierLoc(); 11205 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11206 11207 // C++ [class.friend]p1 11208 // A friend of a class is a function or class.... 11209 // Note that this sees through typedefs, which is intended. 11210 // It *doesn't* see through dependent types, which is correct 11211 // according to [temp.arg.type]p3: 11212 // If a declaration acquires a function type through a 11213 // type dependent on a template-parameter and this causes 11214 // a declaration that does not use the syntactic form of a 11215 // function declarator to have a function type, the program 11216 // is ill-formed. 11217 if (!TInfo->getType()->isFunctionType()) { 11218 Diag(Loc, diag::err_unexpected_friend); 11219 11220 // It might be worthwhile to try to recover by creating an 11221 // appropriate declaration. 11222 return 0; 11223 } 11224 11225 // C++ [namespace.memdef]p3 11226 // - If a friend declaration in a non-local class first declares a 11227 // class or function, the friend class or function is a member 11228 // of the innermost enclosing namespace. 11229 // - The name of the friend is not found by simple name lookup 11230 // until a matching declaration is provided in that namespace 11231 // scope (either before or after the class declaration granting 11232 // friendship). 11233 // - If a friend function is called, its name may be found by the 11234 // name lookup that considers functions from namespaces and 11235 // classes associated with the types of the function arguments. 11236 // - When looking for a prior declaration of a class or a function 11237 // declared as a friend, scopes outside the innermost enclosing 11238 // namespace scope are not considered. 11239 11240 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11241 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11242 DeclarationName Name = NameInfo.getName(); 11243 assert(Name); 11244 11245 // Check for unexpanded parameter packs. 11246 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11247 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11248 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11249 return 0; 11250 11251 // The context we found the declaration in, or in which we should 11252 // create the declaration. 11253 DeclContext *DC; 11254 Scope *DCScope = S; 11255 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11256 ForRedeclaration); 11257 11258 // There are five cases here. 11259 // - There's no scope specifier and we're in a local class. Only look 11260 // for functions declared in the immediately-enclosing block scope. 11261 // We recover from invalid scope qualifiers as if they just weren't there. 11262 FunctionDecl *FunctionContainingLocalClass = 0; 11263 if ((SS.isInvalid() || !SS.isSet()) && 11264 (FunctionContainingLocalClass = 11265 cast<CXXRecordDecl>(CurContext)->isLocalClass())) { 11266 // C++11 [class.friend]p11: 11267 // If a friend declaration appears in a local class and the name 11268 // specified is an unqualified name, a prior declaration is 11269 // looked up without considering scopes that are outside the 11270 // innermost enclosing non-class scope. For a friend function 11271 // declaration, if there is no prior declaration, the program is 11272 // ill-formed. 11273 11274 // Find the innermost enclosing non-class scope. This is the block 11275 // scope containing the local class definition (or for a nested class, 11276 // the outer local class). 11277 DCScope = S->getFnParent(); 11278 11279 // Look up the function name in the scope. 11280 Previous.clear(LookupLocalFriendName); 11281 LookupName(Previous, S, /*AllowBuiltinCreation*/false); 11282 11283 if (!Previous.empty()) { 11284 // All possible previous declarations must have the same context: 11285 // either they were declared at block scope or they are members of 11286 // one of the enclosing local classes. 11287 DC = Previous.getRepresentativeDecl()->getDeclContext(); 11288 } else { 11289 // This is ill-formed, but provide the context that we would have 11290 // declared the function in, if we were permitted to, for error recovery. 11291 DC = FunctionContainingLocalClass; 11292 } 11293 11294 // C++ [class.friend]p6: 11295 // A function can be defined in a friend declaration of a class if and 11296 // only if the class is a non-local class (9.8), the function name is 11297 // unqualified, and the function has namespace scope. 11298 if (D.isFunctionDefinition()) { 11299 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11300 } 11301 11302 // - There's no scope specifier, in which case we just go to the 11303 // appropriate scope and look for a function or function template 11304 // there as appropriate. 11305 } else if (SS.isInvalid() || !SS.isSet()) { 11306 // C++11 [namespace.memdef]p3: 11307 // If the name in a friend declaration is neither qualified nor 11308 // a template-id and the declaration is a function or an 11309 // elaborated-type-specifier, the lookup to determine whether 11310 // the entity has been previously declared shall not consider 11311 // any scopes outside the innermost enclosing namespace. 11312 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11313 11314 // Find the appropriate context according to the above. 11315 DC = CurContext; 11316 11317 // Skip class contexts. If someone can cite chapter and verse 11318 // for this behavior, that would be nice --- it's what GCC and 11319 // EDG do, and it seems like a reasonable intent, but the spec 11320 // really only says that checks for unqualified existing 11321 // declarations should stop at the nearest enclosing namespace, 11322 // not that they should only consider the nearest enclosing 11323 // namespace. 11324 while (DC->isRecord()) 11325 DC = DC->getParent(); 11326 11327 DeclContext *LookupDC = DC; 11328 while (LookupDC->isTransparentContext()) 11329 LookupDC = LookupDC->getParent(); 11330 11331 while (true) { 11332 LookupQualifiedName(Previous, LookupDC); 11333 11334 if (!Previous.empty()) { 11335 DC = LookupDC; 11336 break; 11337 } 11338 11339 if (isTemplateId) { 11340 if (isa<TranslationUnitDecl>(LookupDC)) break; 11341 } else { 11342 if (LookupDC->isFileContext()) break; 11343 } 11344 LookupDC = LookupDC->getParent(); 11345 } 11346 11347 DCScope = getScopeForDeclContext(S, DC); 11348 11349 // - There's a non-dependent scope specifier, in which case we 11350 // compute it and do a previous lookup there for a function 11351 // or function template. 11352 } else if (!SS.getScopeRep()->isDependent()) { 11353 DC = computeDeclContext(SS); 11354 if (!DC) return 0; 11355 11356 if (RequireCompleteDeclContext(SS, DC)) return 0; 11357 11358 LookupQualifiedName(Previous, DC); 11359 11360 // Ignore things found implicitly in the wrong scope. 11361 // TODO: better diagnostics for this case. Suggesting the right 11362 // qualified scope would be nice... 11363 LookupResult::Filter F = Previous.makeFilter(); 11364 while (F.hasNext()) { 11365 NamedDecl *D = F.next(); 11366 if (!DC->InEnclosingNamespaceSetOf( 11367 D->getDeclContext()->getRedeclContext())) 11368 F.erase(); 11369 } 11370 F.done(); 11371 11372 if (Previous.empty()) { 11373 D.setInvalidType(); 11374 Diag(Loc, diag::err_qualified_friend_not_found) 11375 << Name << TInfo->getType(); 11376 return 0; 11377 } 11378 11379 // C++ [class.friend]p1: A friend of a class is a function or 11380 // class that is not a member of the class . . . 11381 if (DC->Equals(CurContext)) 11382 Diag(DS.getFriendSpecLoc(), 11383 getLangOpts().CPlusPlus11 ? 11384 diag::warn_cxx98_compat_friend_is_member : 11385 diag::err_friend_is_member); 11386 11387 if (D.isFunctionDefinition()) { 11388 // C++ [class.friend]p6: 11389 // A function can be defined in a friend declaration of a class if and 11390 // only if the class is a non-local class (9.8), the function name is 11391 // unqualified, and the function has namespace scope. 11392 SemaDiagnosticBuilder DB 11393 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11394 11395 DB << SS.getScopeRep(); 11396 if (DC->isFileContext()) 11397 DB << FixItHint::CreateRemoval(SS.getRange()); 11398 SS.clear(); 11399 } 11400 11401 // - There's a scope specifier that does not match any template 11402 // parameter lists, in which case we use some arbitrary context, 11403 // create a method or method template, and wait for instantiation. 11404 // - There's a scope specifier that does match some template 11405 // parameter lists, which we don't handle right now. 11406 } else { 11407 if (D.isFunctionDefinition()) { 11408 // C++ [class.friend]p6: 11409 // A function can be defined in a friend declaration of a class if and 11410 // only if the class is a non-local class (9.8), the function name is 11411 // unqualified, and the function has namespace scope. 11412 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11413 << SS.getScopeRep(); 11414 } 11415 11416 DC = CurContext; 11417 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11418 } 11419 11420 if (!DC->isRecord()) { 11421 // This implies that it has to be an operator or function. 11422 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11423 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11424 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11425 Diag(Loc, diag::err_introducing_special_friend) << 11426 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11427 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11428 return 0; 11429 } 11430 } 11431 11432 // FIXME: This is an egregious hack to cope with cases where the scope stack 11433 // does not contain the declaration context, i.e., in an out-of-line 11434 // definition of a class. 11435 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11436 if (!DCScope) { 11437 FakeDCScope.setEntity(DC); 11438 DCScope = &FakeDCScope; 11439 } 11440 11441 bool AddToScope = true; 11442 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11443 TemplateParams, AddToScope); 11444 if (!ND) return 0; 11445 11446 assert(ND->getLexicalDeclContext() == CurContext); 11447 11448 // If we performed typo correction, we might have added a scope specifier 11449 // and changed the decl context. 11450 DC = ND->getDeclContext(); 11451 11452 // Add the function declaration to the appropriate lookup tables, 11453 // adjusting the redeclarations list as necessary. We don't 11454 // want to do this yet if the friending class is dependent. 11455 // 11456 // Also update the scope-based lookup if the target context's 11457 // lookup context is in lexical scope. 11458 if (!CurContext->isDependentContext()) { 11459 DC = DC->getRedeclContext(); 11460 DC->makeDeclVisibleInContext(ND); 11461 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11462 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11463 } 11464 11465 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11466 D.getIdentifierLoc(), ND, 11467 DS.getFriendSpecLoc()); 11468 FrD->setAccess(AS_public); 11469 CurContext->addDecl(FrD); 11470 11471 if (ND->isInvalidDecl()) { 11472 FrD->setInvalidDecl(); 11473 } else { 11474 if (DC->isRecord()) CheckFriendAccess(ND); 11475 11476 FunctionDecl *FD; 11477 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11478 FD = FTD->getTemplatedDecl(); 11479 else 11480 FD = cast<FunctionDecl>(ND); 11481 11482 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11483 // default argument expression, that declaration shall be a definition 11484 // and shall be the only declaration of the function or function 11485 // template in the translation unit. 11486 if (functionDeclHasDefaultArgument(FD)) { 11487 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11488 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11489 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11490 } else if (!D.isFunctionDefinition()) 11491 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11492 } 11493 11494 // Mark templated-scope function declarations as unsupported. 11495 if (FD->getNumTemplateParameterLists()) 11496 FrD->setUnsupportedFriend(true); 11497 } 11498 11499 return ND; 11500} 11501 11502void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11503 AdjustDeclIfTemplate(Dcl); 11504 11505 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11506 if (!Fn) { 11507 Diag(DelLoc, diag::err_deleted_non_function); 11508 return; 11509 } 11510 11511 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11512 // Don't consider the implicit declaration we generate for explicit 11513 // specializations. FIXME: Do not generate these implicit declarations. 11514 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11515 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11516 Diag(DelLoc, diag::err_deleted_decl_not_first); 11517 Diag(Prev->getLocation(), diag::note_previous_declaration); 11518 } 11519 // If the declaration wasn't the first, we delete the function anyway for 11520 // recovery. 11521 Fn = Fn->getCanonicalDecl(); 11522 } 11523 11524 if (Fn->isDeleted()) 11525 return; 11526 11527 // See if we're deleting a function which is already known to override a 11528 // non-deleted virtual function. 11529 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11530 bool IssuedDiagnostic = false; 11531 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11532 E = MD->end_overridden_methods(); 11533 I != E; ++I) { 11534 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11535 if (!IssuedDiagnostic) { 11536 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11537 IssuedDiagnostic = true; 11538 } 11539 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11540 } 11541 } 11542 } 11543 11544 Fn->setDeletedAsWritten(); 11545} 11546 11547void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11548 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11549 11550 if (MD) { 11551 if (MD->getParent()->isDependentType()) { 11552 MD->setDefaulted(); 11553 MD->setExplicitlyDefaulted(); 11554 return; 11555 } 11556 11557 CXXSpecialMember Member = getSpecialMember(MD); 11558 if (Member == CXXInvalid) { 11559 if (!MD->isInvalidDecl()) 11560 Diag(DefaultLoc, diag::err_default_special_members); 11561 return; 11562 } 11563 11564 MD->setDefaulted(); 11565 MD->setExplicitlyDefaulted(); 11566 11567 // If this definition appears within the record, do the checking when 11568 // the record is complete. 11569 const FunctionDecl *Primary = MD; 11570 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11571 // Find the uninstantiated declaration that actually had the '= default' 11572 // on it. 11573 Pattern->isDefined(Primary); 11574 11575 // If the method was defaulted on its first declaration, we will have 11576 // already performed the checking in CheckCompletedCXXClass. Such a 11577 // declaration doesn't trigger an implicit definition. 11578 if (Primary == Primary->getCanonicalDecl()) 11579 return; 11580 11581 CheckExplicitlyDefaultedSpecialMember(MD); 11582 11583 // The exception specification is needed because we are defining the 11584 // function. 11585 ResolveExceptionSpec(DefaultLoc, 11586 MD->getType()->castAs<FunctionProtoType>()); 11587 11588 if (MD->isInvalidDecl()) 11589 return; 11590 11591 switch (Member) { 11592 case CXXDefaultConstructor: 11593 DefineImplicitDefaultConstructor(DefaultLoc, 11594 cast<CXXConstructorDecl>(MD)); 11595 break; 11596 case CXXCopyConstructor: 11597 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11598 break; 11599 case CXXCopyAssignment: 11600 DefineImplicitCopyAssignment(DefaultLoc, MD); 11601 break; 11602 case CXXDestructor: 11603 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); 11604 break; 11605 case CXXMoveConstructor: 11606 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11607 break; 11608 case CXXMoveAssignment: 11609 DefineImplicitMoveAssignment(DefaultLoc, MD); 11610 break; 11611 case CXXInvalid: 11612 llvm_unreachable("Invalid special member."); 11613 } 11614 } else { 11615 Diag(DefaultLoc, diag::err_default_special_members); 11616 } 11617} 11618 11619static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11620 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11621 Stmt *SubStmt = *CI; 11622 if (!SubStmt) 11623 continue; 11624 if (isa<ReturnStmt>(SubStmt)) 11625 Self.Diag(SubStmt->getLocStart(), 11626 diag::err_return_in_constructor_handler); 11627 if (!isa<Expr>(SubStmt)) 11628 SearchForReturnInStmt(Self, SubStmt); 11629 } 11630} 11631 11632void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11633 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11634 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11635 SearchForReturnInStmt(*this, Handler); 11636 } 11637} 11638 11639bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11640 const CXXMethodDecl *Old) { 11641 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11642 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11643 11644 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11645 11646 // If the calling conventions match, everything is fine 11647 if (NewCC == OldCC) 11648 return false; 11649 11650 // If either of the calling conventions are set to "default", we need to pick 11651 // something more sensible based on the target. This supports code where the 11652 // one method explicitly sets thiscall, and another has no explicit calling 11653 // convention. 11654 CallingConv Default = 11655 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11656 if (NewCC == CC_Default) 11657 NewCC = Default; 11658 if (OldCC == CC_Default) 11659 OldCC = Default; 11660 11661 // If the calling conventions still don't match, then report the error 11662 if (NewCC != OldCC) { 11663 Diag(New->getLocation(), 11664 diag::err_conflicting_overriding_cc_attributes) 11665 << New->getDeclName() << New->getType() << Old->getType(); 11666 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11667 return true; 11668 } 11669 11670 return false; 11671} 11672 11673bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11674 const CXXMethodDecl *Old) { 11675 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11676 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11677 11678 if (Context.hasSameType(NewTy, OldTy) || 11679 NewTy->isDependentType() || OldTy->isDependentType()) 11680 return false; 11681 11682 // Check if the return types are covariant 11683 QualType NewClassTy, OldClassTy; 11684 11685 /// Both types must be pointers or references to classes. 11686 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11687 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11688 NewClassTy = NewPT->getPointeeType(); 11689 OldClassTy = OldPT->getPointeeType(); 11690 } 11691 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11692 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11693 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11694 NewClassTy = NewRT->getPointeeType(); 11695 OldClassTy = OldRT->getPointeeType(); 11696 } 11697 } 11698 } 11699 11700 // The return types aren't either both pointers or references to a class type. 11701 if (NewClassTy.isNull()) { 11702 Diag(New->getLocation(), 11703 diag::err_different_return_type_for_overriding_virtual_function) 11704 << New->getDeclName() << NewTy << OldTy; 11705 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11706 11707 return true; 11708 } 11709 11710 // C++ [class.virtual]p6: 11711 // If the return type of D::f differs from the return type of B::f, the 11712 // class type in the return type of D::f shall be complete at the point of 11713 // declaration of D::f or shall be the class type D. 11714 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11715 if (!RT->isBeingDefined() && 11716 RequireCompleteType(New->getLocation(), NewClassTy, 11717 diag::err_covariant_return_incomplete, 11718 New->getDeclName())) 11719 return true; 11720 } 11721 11722 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11723 // Check if the new class derives from the old class. 11724 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11725 Diag(New->getLocation(), 11726 diag::err_covariant_return_not_derived) 11727 << New->getDeclName() << NewTy << OldTy; 11728 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11729 return true; 11730 } 11731 11732 // Check if we the conversion from derived to base is valid. 11733 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11734 diag::err_covariant_return_inaccessible_base, 11735 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11736 // FIXME: Should this point to the return type? 11737 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11738 // FIXME: this note won't trigger for delayed access control 11739 // diagnostics, and it's impossible to get an undelayed error 11740 // here from access control during the original parse because 11741 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11742 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11743 return true; 11744 } 11745 } 11746 11747 // The qualifiers of the return types must be the same. 11748 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11749 Diag(New->getLocation(), 11750 diag::err_covariant_return_type_different_qualifications) 11751 << New->getDeclName() << NewTy << OldTy; 11752 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11753 return true; 11754 }; 11755 11756 11757 // The new class type must have the same or less qualifiers as the old type. 11758 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11759 Diag(New->getLocation(), 11760 diag::err_covariant_return_type_class_type_more_qualified) 11761 << New->getDeclName() << NewTy << OldTy; 11762 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11763 return true; 11764 }; 11765 11766 return false; 11767} 11768 11769/// \brief Mark the given method pure. 11770/// 11771/// \param Method the method to be marked pure. 11772/// 11773/// \param InitRange the source range that covers the "0" initializer. 11774bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11775 SourceLocation EndLoc = InitRange.getEnd(); 11776 if (EndLoc.isValid()) 11777 Method->setRangeEnd(EndLoc); 11778 11779 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11780 Method->setPure(); 11781 return false; 11782 } 11783 11784 if (!Method->isInvalidDecl()) 11785 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11786 << Method->getDeclName() << InitRange; 11787 return true; 11788} 11789 11790/// \brief Determine whether the given declaration is a static data member. 11791static bool isStaticDataMember(const Decl *D) { 11792 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) 11793 return Var->isStaticDataMember(); 11794 11795 return false; 11796} 11797 11798/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11799/// an initializer for the out-of-line declaration 'Dcl'. The scope 11800/// is a fresh scope pushed for just this purpose. 11801/// 11802/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11803/// static data member of class X, names should be looked up in the scope of 11804/// class X. 11805void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11806 // If there is no declaration, there was an error parsing it. 11807 if (D == 0 || D->isInvalidDecl()) return; 11808 11809 // We should only get called for declarations with scope specifiers, like: 11810 // int foo::bar; 11811 assert(D->isOutOfLine()); 11812 EnterDeclaratorContext(S, D->getDeclContext()); 11813 11814 // If we are parsing the initializer for a static data member, push a 11815 // new expression evaluation context that is associated with this static 11816 // data member. 11817 if (isStaticDataMember(D)) 11818 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11819} 11820 11821/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11822/// initializer for the out-of-line declaration 'D'. 11823void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11824 // If there is no declaration, there was an error parsing it. 11825 if (D == 0 || D->isInvalidDecl()) return; 11826 11827 if (isStaticDataMember(D)) 11828 PopExpressionEvaluationContext(); 11829 11830 assert(D->isOutOfLine()); 11831 ExitDeclaratorContext(S); 11832} 11833 11834/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11835/// C++ if/switch/while/for statement. 11836/// e.g: "if (int x = f()) {...}" 11837DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11838 // C++ 6.4p2: 11839 // The declarator shall not specify a function or an array. 11840 // The type-specifier-seq shall not contain typedef and shall not declare a 11841 // new class or enumeration. 11842 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11843 "Parser allowed 'typedef' as storage class of condition decl."); 11844 11845 Decl *Dcl = ActOnDeclarator(S, D); 11846 if (!Dcl) 11847 return true; 11848 11849 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11850 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11851 << D.getSourceRange(); 11852 return true; 11853 } 11854 11855 return Dcl; 11856} 11857 11858void Sema::LoadExternalVTableUses() { 11859 if (!ExternalSource) 11860 return; 11861 11862 SmallVector<ExternalVTableUse, 4> VTables; 11863 ExternalSource->ReadUsedVTables(VTables); 11864 SmallVector<VTableUse, 4> NewUses; 11865 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11866 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11867 = VTablesUsed.find(VTables[I].Record); 11868 // Even if a definition wasn't required before, it may be required now. 11869 if (Pos != VTablesUsed.end()) { 11870 if (!Pos->second && VTables[I].DefinitionRequired) 11871 Pos->second = true; 11872 continue; 11873 } 11874 11875 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11876 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11877 } 11878 11879 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11880} 11881 11882void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11883 bool DefinitionRequired) { 11884 // Ignore any vtable uses in unevaluated operands or for classes that do 11885 // not have a vtable. 11886 if (!Class->isDynamicClass() || Class->isDependentContext() || 11887 CurContext->isDependentContext() || isUnevaluatedContext()) 11888 return; 11889 11890 // Try to insert this class into the map. 11891 LoadExternalVTableUses(); 11892 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11893 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11894 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11895 if (!Pos.second) { 11896 // If we already had an entry, check to see if we are promoting this vtable 11897 // to required a definition. If so, we need to reappend to the VTableUses 11898 // list, since we may have already processed the first entry. 11899 if (DefinitionRequired && !Pos.first->second) { 11900 Pos.first->second = true; 11901 } else { 11902 // Otherwise, we can early exit. 11903 return; 11904 } 11905 } 11906 11907 // Local classes need to have their virtual members marked 11908 // immediately. For all other classes, we mark their virtual members 11909 // at the end of the translation unit. 11910 if (Class->isLocalClass()) 11911 MarkVirtualMembersReferenced(Loc, Class); 11912 else 11913 VTableUses.push_back(std::make_pair(Class, Loc)); 11914} 11915 11916bool Sema::DefineUsedVTables() { 11917 LoadExternalVTableUses(); 11918 if (VTableUses.empty()) 11919 return false; 11920 11921 // Note: The VTableUses vector could grow as a result of marking 11922 // the members of a class as "used", so we check the size each 11923 // time through the loop and prefer indices (which are stable) to 11924 // iterators (which are not). 11925 bool DefinedAnything = false; 11926 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11927 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11928 if (!Class) 11929 continue; 11930 11931 SourceLocation Loc = VTableUses[I].second; 11932 11933 bool DefineVTable = true; 11934 11935 // If this class has a key function, but that key function is 11936 // defined in another translation unit, we don't need to emit the 11937 // vtable even though we're using it. 11938 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11939 if (KeyFunction && !KeyFunction->hasBody()) { 11940 switch (KeyFunction->getTemplateSpecializationKind()) { 11941 case TSK_Undeclared: 11942 case TSK_ExplicitSpecialization: 11943 case TSK_ExplicitInstantiationDeclaration: 11944 // The key function is in another translation unit. 11945 DefineVTable = false; 11946 break; 11947 11948 case TSK_ExplicitInstantiationDefinition: 11949 case TSK_ImplicitInstantiation: 11950 // We will be instantiating the key function. 11951 break; 11952 } 11953 } else if (!KeyFunction) { 11954 // If we have a class with no key function that is the subject 11955 // of an explicit instantiation declaration, suppress the 11956 // vtable; it will live with the explicit instantiation 11957 // definition. 11958 bool IsExplicitInstantiationDeclaration 11959 = Class->getTemplateSpecializationKind() 11960 == TSK_ExplicitInstantiationDeclaration; 11961 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11962 REnd = Class->redecls_end(); 11963 R != REnd; ++R) { 11964 TemplateSpecializationKind TSK 11965 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11966 if (TSK == TSK_ExplicitInstantiationDeclaration) 11967 IsExplicitInstantiationDeclaration = true; 11968 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11969 IsExplicitInstantiationDeclaration = false; 11970 break; 11971 } 11972 } 11973 11974 if (IsExplicitInstantiationDeclaration) 11975 DefineVTable = false; 11976 } 11977 11978 // The exception specifications for all virtual members may be needed even 11979 // if we are not providing an authoritative form of the vtable in this TU. 11980 // We may choose to emit it available_externally anyway. 11981 if (!DefineVTable) { 11982 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11983 continue; 11984 } 11985 11986 // Mark all of the virtual members of this class as referenced, so 11987 // that we can build a vtable. Then, tell the AST consumer that a 11988 // vtable for this class is required. 11989 DefinedAnything = true; 11990 MarkVirtualMembersReferenced(Loc, Class); 11991 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11992 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11993 11994 // Optionally warn if we're emitting a weak vtable. 11995 if (Class->isExternallyVisible() && 11996 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11997 const FunctionDecl *KeyFunctionDef = 0; 11998 if (!KeyFunction || 11999 (KeyFunction->hasBody(KeyFunctionDef) && 12000 KeyFunctionDef->isInlined())) 12001 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 12002 TSK_ExplicitInstantiationDefinition 12003 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 12004 << Class; 12005 } 12006 } 12007 VTableUses.clear(); 12008 12009 return DefinedAnything; 12010} 12011 12012void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12013 const CXXRecordDecl *RD) { 12014 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12015 E = RD->method_end(); I != E; ++I) 12016 if ((*I)->isVirtual() && !(*I)->isPure()) 12017 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12018} 12019 12020void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12021 const CXXRecordDecl *RD) { 12022 // Mark all functions which will appear in RD's vtable as used. 12023 CXXFinalOverriderMap FinalOverriders; 12024 RD->getFinalOverriders(FinalOverriders); 12025 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12026 E = FinalOverriders.end(); 12027 I != E; ++I) { 12028 for (OverridingMethods::const_iterator OI = I->second.begin(), 12029 OE = I->second.end(); 12030 OI != OE; ++OI) { 12031 assert(OI->second.size() > 0 && "no final overrider"); 12032 CXXMethodDecl *Overrider = OI->second.front().Method; 12033 12034 // C++ [basic.def.odr]p2: 12035 // [...] A virtual member function is used if it is not pure. [...] 12036 if (!Overrider->isPure()) 12037 MarkFunctionReferenced(Loc, Overrider); 12038 } 12039 } 12040 12041 // Only classes that have virtual bases need a VTT. 12042 if (RD->getNumVBases() == 0) 12043 return; 12044 12045 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12046 e = RD->bases_end(); i != e; ++i) { 12047 const CXXRecordDecl *Base = 12048 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12049 if (Base->getNumVBases() == 0) 12050 continue; 12051 MarkVirtualMembersReferenced(Loc, Base); 12052 } 12053} 12054 12055/// SetIvarInitializers - This routine builds initialization ASTs for the 12056/// Objective-C implementation whose ivars need be initialized. 12057void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12058 if (!getLangOpts().CPlusPlus) 12059 return; 12060 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12061 SmallVector<ObjCIvarDecl*, 8> ivars; 12062 CollectIvarsToConstructOrDestruct(OID, ivars); 12063 if (ivars.empty()) 12064 return; 12065 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12066 for (unsigned i = 0; i < ivars.size(); i++) { 12067 FieldDecl *Field = ivars[i]; 12068 if (Field->isInvalidDecl()) 12069 continue; 12070 12071 CXXCtorInitializer *Member; 12072 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12073 InitializationKind InitKind = 12074 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12075 12076 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12077 ExprResult MemberInit = 12078 InitSeq.Perform(*this, InitEntity, InitKind, None); 12079 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12080 // Note, MemberInit could actually come back empty if no initialization 12081 // is required (e.g., because it would call a trivial default constructor) 12082 if (!MemberInit.get() || MemberInit.isInvalid()) 12083 continue; 12084 12085 Member = 12086 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12087 SourceLocation(), 12088 MemberInit.takeAs<Expr>(), 12089 SourceLocation()); 12090 AllToInit.push_back(Member); 12091 12092 // Be sure that the destructor is accessible and is marked as referenced. 12093 if (const RecordType *RecordTy 12094 = Context.getBaseElementType(Field->getType()) 12095 ->getAs<RecordType>()) { 12096 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12097 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12098 MarkFunctionReferenced(Field->getLocation(), Destructor); 12099 CheckDestructorAccess(Field->getLocation(), Destructor, 12100 PDiag(diag::err_access_dtor_ivar) 12101 << Context.getBaseElementType(Field->getType())); 12102 } 12103 } 12104 } 12105 ObjCImplementation->setIvarInitializers(Context, 12106 AllToInit.data(), AllToInit.size()); 12107 } 12108} 12109 12110static 12111void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12112 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12113 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12114 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12115 Sema &S) { 12116 if (Ctor->isInvalidDecl()) 12117 return; 12118 12119 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12120 12121 // Target may not be determinable yet, for instance if this is a dependent 12122 // call in an uninstantiated template. 12123 if (Target) { 12124 const FunctionDecl *FNTarget = 0; 12125 (void)Target->hasBody(FNTarget); 12126 Target = const_cast<CXXConstructorDecl*>( 12127 cast_or_null<CXXConstructorDecl>(FNTarget)); 12128 } 12129 12130 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12131 // Avoid dereferencing a null pointer here. 12132 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12133 12134 if (!Current.insert(Canonical)) 12135 return; 12136 12137 // We know that beyond here, we aren't chaining into a cycle. 12138 if (!Target || !Target->isDelegatingConstructor() || 12139 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12140 Valid.insert(Current.begin(), Current.end()); 12141 Current.clear(); 12142 // We've hit a cycle. 12143 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12144 Current.count(TCanonical)) { 12145 // If we haven't diagnosed this cycle yet, do so now. 12146 if (!Invalid.count(TCanonical)) { 12147 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12148 diag::warn_delegating_ctor_cycle) 12149 << Ctor; 12150 12151 // Don't add a note for a function delegating directly to itself. 12152 if (TCanonical != Canonical) 12153 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12154 12155 CXXConstructorDecl *C = Target; 12156 while (C->getCanonicalDecl() != Canonical) { 12157 const FunctionDecl *FNTarget = 0; 12158 (void)C->getTargetConstructor()->hasBody(FNTarget); 12159 assert(FNTarget && "Ctor cycle through bodiless function"); 12160 12161 C = const_cast<CXXConstructorDecl*>( 12162 cast<CXXConstructorDecl>(FNTarget)); 12163 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12164 } 12165 } 12166 12167 Invalid.insert(Current.begin(), Current.end()); 12168 Current.clear(); 12169 } else { 12170 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12171 } 12172} 12173 12174 12175void Sema::CheckDelegatingCtorCycles() { 12176 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12177 12178 for (DelegatingCtorDeclsType::iterator 12179 I = DelegatingCtorDecls.begin(ExternalSource), 12180 E = DelegatingCtorDecls.end(); 12181 I != E; ++I) 12182 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12183 12184 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(), 12185 CE = Invalid.end(); 12186 CI != CE; ++CI) 12187 (*CI)->setInvalidDecl(); 12188} 12189 12190namespace { 12191 /// \brief AST visitor that finds references to the 'this' expression. 12192 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12193 Sema &S; 12194 12195 public: 12196 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12197 12198 bool VisitCXXThisExpr(CXXThisExpr *E) { 12199 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12200 << E->isImplicit(); 12201 return false; 12202 } 12203 }; 12204} 12205 12206bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12207 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12208 if (!TSInfo) 12209 return false; 12210 12211 TypeLoc TL = TSInfo->getTypeLoc(); 12212 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12213 if (!ProtoTL) 12214 return false; 12215 12216 // C++11 [expr.prim.general]p3: 12217 // [The expression this] shall not appear before the optional 12218 // cv-qualifier-seq and it shall not appear within the declaration of a 12219 // static member function (although its type and value category are defined 12220 // within a static member function as they are within a non-static member 12221 // function). [ Note: this is because declaration matching does not occur 12222 // until the complete declarator is known. - end note ] 12223 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12224 FindCXXThisExpr Finder(*this); 12225 12226 // If the return type came after the cv-qualifier-seq, check it now. 12227 if (Proto->hasTrailingReturn() && 12228 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12229 return true; 12230 12231 // Check the exception specification. 12232 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12233 return true; 12234 12235 return checkThisInStaticMemberFunctionAttributes(Method); 12236} 12237 12238bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12239 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12240 if (!TSInfo) 12241 return false; 12242 12243 TypeLoc TL = TSInfo->getTypeLoc(); 12244 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12245 if (!ProtoTL) 12246 return false; 12247 12248 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12249 FindCXXThisExpr Finder(*this); 12250 12251 switch (Proto->getExceptionSpecType()) { 12252 case EST_Uninstantiated: 12253 case EST_Unevaluated: 12254 case EST_BasicNoexcept: 12255 case EST_DynamicNone: 12256 case EST_MSAny: 12257 case EST_None: 12258 break; 12259 12260 case EST_ComputedNoexcept: 12261 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12262 return true; 12263 12264 case EST_Dynamic: 12265 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12266 EEnd = Proto->exception_end(); 12267 E != EEnd; ++E) { 12268 if (!Finder.TraverseType(*E)) 12269 return true; 12270 } 12271 break; 12272 } 12273 12274 return false; 12275} 12276 12277bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12278 FindCXXThisExpr Finder(*this); 12279 12280 // Check attributes. 12281 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12282 A != AEnd; ++A) { 12283 // FIXME: This should be emitted by tblgen. 12284 Expr *Arg = 0; 12285 ArrayRef<Expr *> Args; 12286 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12287 Arg = G->getArg(); 12288 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12289 Arg = G->getArg(); 12290 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12291 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12292 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12293 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12294 else if (ExclusiveLockFunctionAttr *ELF 12295 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12296 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12297 else if (SharedLockFunctionAttr *SLF 12298 = dyn_cast<SharedLockFunctionAttr>(*A)) 12299 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12300 else if (ExclusiveTrylockFunctionAttr *ETLF 12301 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12302 Arg = ETLF->getSuccessValue(); 12303 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12304 } else if (SharedTrylockFunctionAttr *STLF 12305 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12306 Arg = STLF->getSuccessValue(); 12307 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12308 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12309 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12310 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12311 Arg = LR->getArg(); 12312 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12313 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12314 else if (ExclusiveLocksRequiredAttr *ELR 12315 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12316 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12317 else if (SharedLocksRequiredAttr *SLR 12318 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12319 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12320 12321 if (Arg && !Finder.TraverseStmt(Arg)) 12322 return true; 12323 12324 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12325 if (!Finder.TraverseStmt(Args[I])) 12326 return true; 12327 } 12328 } 12329 12330 return false; 12331} 12332 12333void 12334Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12335 ArrayRef<ParsedType> DynamicExceptions, 12336 ArrayRef<SourceRange> DynamicExceptionRanges, 12337 Expr *NoexceptExpr, 12338 SmallVectorImpl<QualType> &Exceptions, 12339 FunctionProtoType::ExtProtoInfo &EPI) { 12340 Exceptions.clear(); 12341 EPI.ExceptionSpecType = EST; 12342 if (EST == EST_Dynamic) { 12343 Exceptions.reserve(DynamicExceptions.size()); 12344 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12345 // FIXME: Preserve type source info. 12346 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12347 12348 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12349 collectUnexpandedParameterPacks(ET, Unexpanded); 12350 if (!Unexpanded.empty()) { 12351 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12352 UPPC_ExceptionType, 12353 Unexpanded); 12354 continue; 12355 } 12356 12357 // Check that the type is valid for an exception spec, and 12358 // drop it if not. 12359 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12360 Exceptions.push_back(ET); 12361 } 12362 EPI.NumExceptions = Exceptions.size(); 12363 EPI.Exceptions = Exceptions.data(); 12364 return; 12365 } 12366 12367 if (EST == EST_ComputedNoexcept) { 12368 // If an error occurred, there's no expression here. 12369 if (NoexceptExpr) { 12370 assert((NoexceptExpr->isTypeDependent() || 12371 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12372 Context.BoolTy) && 12373 "Parser should have made sure that the expression is boolean"); 12374 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12375 EPI.ExceptionSpecType = EST_BasicNoexcept; 12376 return; 12377 } 12378 12379 if (!NoexceptExpr->isValueDependent()) 12380 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12381 diag::err_noexcept_needs_constant_expression, 12382 /*AllowFold*/ false).take(); 12383 EPI.NoexceptExpr = NoexceptExpr; 12384 } 12385 return; 12386 } 12387} 12388 12389/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12390Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12391 // Implicitly declared functions (e.g. copy constructors) are 12392 // __host__ __device__ 12393 if (D->isImplicit()) 12394 return CFT_HostDevice; 12395 12396 if (D->hasAttr<CUDAGlobalAttr>()) 12397 return CFT_Global; 12398 12399 if (D->hasAttr<CUDADeviceAttr>()) { 12400 if (D->hasAttr<CUDAHostAttr>()) 12401 return CFT_HostDevice; 12402 return CFT_Device; 12403 } 12404 12405 return CFT_Host; 12406} 12407 12408bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12409 CUDAFunctionTarget CalleeTarget) { 12410 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12411 // Callable from the device only." 12412 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12413 return true; 12414 12415 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12416 // Callable from the host only." 12417 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12418 // Callable from the host only." 12419 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12420 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12421 return true; 12422 12423 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12424 return true; 12425 12426 return false; 12427} 12428 12429/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12430/// 12431MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12432 SourceLocation DeclStart, 12433 Declarator &D, Expr *BitWidth, 12434 InClassInitStyle InitStyle, 12435 AccessSpecifier AS, 12436 AttributeList *MSPropertyAttr) { 12437 IdentifierInfo *II = D.getIdentifier(); 12438 if (!II) { 12439 Diag(DeclStart, diag::err_anonymous_property); 12440 return NULL; 12441 } 12442 SourceLocation Loc = D.getIdentifierLoc(); 12443 12444 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12445 QualType T = TInfo->getType(); 12446 if (getLangOpts().CPlusPlus) { 12447 CheckExtraCXXDefaultArguments(D); 12448 12449 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12450 UPPC_DataMemberType)) { 12451 D.setInvalidType(); 12452 T = Context.IntTy; 12453 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12454 } 12455 } 12456 12457 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12458 12459 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12460 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12461 diag::err_invalid_thread) 12462 << DeclSpec::getSpecifierName(TSCS); 12463 12464 // Check to see if this name was declared as a member previously 12465 NamedDecl *PrevDecl = 0; 12466 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12467 LookupName(Previous, S); 12468 switch (Previous.getResultKind()) { 12469 case LookupResult::Found: 12470 case LookupResult::FoundUnresolvedValue: 12471 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12472 break; 12473 12474 case LookupResult::FoundOverloaded: 12475 PrevDecl = Previous.getRepresentativeDecl(); 12476 break; 12477 12478 case LookupResult::NotFound: 12479 case LookupResult::NotFoundInCurrentInstantiation: 12480 case LookupResult::Ambiguous: 12481 break; 12482 } 12483 12484 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12485 // Maybe we will complain about the shadowed template parameter. 12486 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12487 // Just pretend that we didn't see the previous declaration. 12488 PrevDecl = 0; 12489 } 12490 12491 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12492 PrevDecl = 0; 12493 12494 SourceLocation TSSL = D.getLocStart(); 12495 MSPropertyDecl *NewPD; 12496 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12497 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12498 II, T, TInfo, TSSL, 12499 Data.GetterId, Data.SetterId); 12500 ProcessDeclAttributes(TUScope, NewPD, D); 12501 NewPD->setAccess(AS); 12502 12503 if (NewPD->isInvalidDecl()) 12504 Record->setInvalidDecl(); 12505 12506 if (D.getDeclSpec().isModulePrivateSpecified()) 12507 NewPD->setModulePrivate(); 12508 12509 if (NewPD->isInvalidDecl() && PrevDecl) { 12510 // Don't introduce NewFD into scope; there's already something 12511 // with the same name in the same scope. 12512 } else if (II) { 12513 PushOnScopeChains(NewPD, S); 12514 } else 12515 Record->addDecl(NewPD); 12516 12517 return NewPD; 12518} 12519